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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.  There should be no loss
   6  * of information.
   7  */
   8
   9 /*
  10  * Copyright (C) 2012 Eric Biggers
  11  *
  12  * This file is part of wimlib, a library for working with WIM files.
  13  *
  14  * wimlib is free software; you can redistribute it and/or modify it under the
  15  * terms of the GNU Lesser General Public License as published by the Free
  16  * Software Foundation; either version 2.1 of the License, or (at your option)
  17  * any later version.
  18  *
  19  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  20  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  21  * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  22  * details.
  23  *
  24  * You should have received a copy of the GNU Lesser General Public License
  25  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  26  */
  27
  28 #include "config.h"
  29 #include "wimlib_internal.h"
  30
  31
  32 #ifdef WITH_NTFS_3G
  33 #include "dentry.h"
  34 #include "lookup_table.h"
  35 #include "io.h"
  36 #include <ntfs-3g/layout.h>
  37 #include <ntfs-3g/acls.h>
  38 #include <ntfs-3g/attrib.h>
  39 #include <ntfs-3g/misc.h>
  40 #include <ntfs-3g/reparse.h>
  41 #include <ntfs-3g/security.h>
  42 #include <ntfs-3g/volume.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45
  46 extern int ntfs_inode_get_security(ntfs_inode *ni, u32 selection, char *buf,
  47                                    u32 buflen, u32 *psize);
  48
  49 extern int ntfs_inode_get_attributes(ntfs_inode *ni);
  50
  51 struct sd_tree {
  52         u32 num_sds;
  53         struct wim_security_data *sd;
  54         struct sd_node *root;
  55 };
  56
  57 struct sd_node {
  58         int security_id;
  59         u8 hash[SHA1_HASH_SIZE];
  60         struct sd_node *left;
  61         struct sd_node *right;
  62 };
  63
  64 static void free_sd_tree(struct sd_node *root)
  65 {
  66         if (root) {
  67                 free_sd_tree(root->left);
  68                 free_sd_tree(root->right);
  69                 FREE(root);
  70         }
  71 }
  72
  73 static void insert_sd_node(struct sd_node *new, struct sd_node *root)
  74 {
  75         int cmp = hashes_cmp(root->hash, new->hash);
  76         if (cmp < 0) {
  77                 if (root->left)
  78                         insert_sd_node(new, root->left);
  79                 else
  80                         root->left = new;
  81         } else if (cmp > 0) {
  82                 if (root->right)
  83                         insert_sd_node(new, root->right);
  84                 else
  85                         root->right = new;
  86         } else {
  87                 wimlib_assert(0);
  88         }
  89 }
  90
  91 static int lookup_sd(const u8 hash[SHA1_HASH_SIZE], struct sd_node *node)
  92 {
  93         int cmp;
  94         if (!node)
  95                 return -1;
  96         cmp = hashes_cmp(hash, node->hash);
  97         if (cmp < 0)
  98                 return lookup_sd(hash, node->left);
  99         else if (cmp > 0)
 100                 return lookup_sd(hash, node->right);
 101         else
 102                 return node->security_id;
 103 }
 104
 105 static int tree_add_sd(struct sd_tree *tree, const u8 *descriptor,
 106                        size_t size)
 107 {
 108         u8 hash[SHA1_HASH_SIZE];
 109         int security_id;
 110         struct sd_node *new;
 111         u8 **descriptors;
 112         u64 *sizes;
 113         u8 *descr_copy;
 114         struct wim_security_data *sd = tree->sd;
 115         sha1_buffer(descriptor, size, hash);
 116
 117         security_id = lookup_sd(hash, tree->root);
 118         if (security_id >= 0)
 119                 return security_id;
 120
 121         new = MALLOC(sizeof(struct sd_node));
 122         if (!new)
 123                 return -1;
 124         descr_copy = MALLOC(size);
 125         if (!descr_copy)
 126                 goto out_free_node;
 127         memcpy(descr_copy, descriptor, size);
 128         new->security_id = tree->num_sds++;
 129         new->left = NULL;
 130         new->right = NULL;
 131         copy_hash(new->hash, hash);
 132
 133         descriptors = REALLOC(sd->descriptors,
 134                               (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
 135         if (!descriptors)
 136                 goto out_free_descr;
 137         sd->descriptors = descriptors;
 138         sizes = REALLOC(sd->sizes,
 139                         (sd->num_entries + 1) * sizeof(sd->sizes[0]));
 140         if (!sizes)
 141                 goto out_free_descr;
 142         sd->sizes = sizes;
 143         sd->descriptors[sd->num_entries] = descr_copy;
 144         sd->sizes[sd->num_entries] = size;
 145         sd->num_entries++;
 146         sd->total_length += size + 8;
 147
 148         if (tree->root)
 149                 insert_sd_node(tree->root, new);
 150         else
 151                 tree->root = new;
 152         return new->security_id;
 153 out_free_descr:
 154         FREE(descr_copy);
 155 out_free_node:
 156         FREE(new);
 157         return -1;
 158 }
 159
 160 #if 0
 161 static int build_sd_tree(struct wim_security_data *sd, struct sd_tree *tree)
 162 {
 163         int ret;
 164         u32 orig_num_entries = sd->num_entries;
 165         u32 orig_total_length = sd->total_length;
 166
 167         tree->num_sds = 0;
 168         tree->sd = sd;
 169         tree->root = NULL;
 170
 171         for (u32 i = 0; i < sd->num_entries; i++) {
 172                 ret = tree_add_sd(tree, sd->descriptors[i], sd->sizes[i]);
 173                 if (ret < 0)
 174                         goto out_revert;
 175         }
 176         return 0;
 177 out_revert:
 178         sd->num_entries = orig_num_entries;
 179         sd->total_length = orig_total_length;
 180         free_sd_tree(tree->root);
 181         return ret;
 182 }
 183 #endif
 184
 185 static int __build_dentry_tree_ntfs(struct dentry *dentry, ntfs_inode *ni,
 186                                     struct lookup_table *lookup_table,
 187                                     struct sd_tree *tree)
 188 {
 189         u32 attributes = ntfs_inode_get_attributes(ni);
 190         int mrec_flags = ni->mrec->flags;
 191         u32 sd_size;
 192         int ret;
 193
 194         dentry->creation_time    = le64_to_cpu(ni->creation_time);
 195         dentry->last_write_time  = le64_to_cpu(ni->last_data_change_time);
 196         dentry->last_access_time = le64_to_cpu(ni->last_access_time);
 197         dentry->security_id      = le32_to_cpu(ni->security_id);
 198         dentry->attributes       = le32_to_cpu(attributes);
 199
 200         if (mrec_flags & MFT_RECORD_IS_DIRECTORY) {
 201                 if (attributes & FILE_ATTR_REPARSE_POINT) {
 202                         /* Junction point */
 203                 } else {
 204                         /* Normal directory */
 205                 }
 206         } else {
 207                 if (attributes & FILE_ATTR_REPARSE_POINT) {
 208                         /* Symbolic link or other reparse point */
 209                 } else {
 210                         /* Normal file */
 211                 }
 212         }
 213         ret = ntfs_inode_get_security(ni,
 214                                       OWNER_SECURITY_INFORMATION |
 215                                       GROUP_SECURITY_INFORMATION |
 216                                       DACL_SECURITY_INFORMATION  |
 217                                       SACL_SECURITY_INFORMATION,
 218                                       NULL, 0, &sd_size);
 219         u8 sd[sd_size];
 220         ret = ntfs_inode_get_security(ni,
 221                                       OWNER_SECURITY_INFORMATION |
 222                                       GROUP_SECURITY_INFORMATION |
 223                                       DACL_SECURITY_INFORMATION  |
 224                                       SACL_SECURITY_INFORMATION,
 225                                       sd, sd_size, &sd_size);
 226         dentry->security_id = tree_add_sd(tree, sd, sd_size);
 227
 228         return 0;
 229 }
 230
 231 static int build_dentry_tree_ntfs(struct dentry *root_dentry,
 232                                   const char *device,
 233                                   struct lookup_table *lookup_table,
 234                                   int flags)
 235 {
 236         ntfs_volume *vol;
 237         ntfs_inode *root_ni;
 238         int ret = 0;
 239         struct sd_tree tree;
 240         tree.sd = CALLOC(1, sizeof(struct wim_security_data));
 241         if (!tree.sd)
 242                 return WIMLIB_ERR_NOMEM;
 243         tree.sd->total_length = 8;
 244         tree.root = NULL;
 245
 246         vol = ntfs_mount(device, MS_RDONLY);
 247         if (!vol) {
 248                 ERROR_WITH_ERRNO("Failed to mount NTFS volume `%s' read-only",
 249                                  device);
 250                 return WIMLIB_ERR_NTFS_3G;
 251         }
 252         root_ni = ntfs_inode_open(vol, FILE_root);
 253         if (!root_ni) {
 254                 ERROR_WITH_ERRNO("Failed to open root inode of NTFS volume "
 255                                  "`%s'", device);
 256                 ret = WIMLIB_ERR_NTFS_3G;
 257                 goto out;
 258         }
 259         ret = __build_dentry_tree_ntfs(root_dentry, root_ni, lookup_table, &tree);
 260
 261 out:
 262         if (ntfs_umount(vol, FALSE) != 0) {
 263                 ERROR_WITH_ERRNO("Failed to unmount NTFS volume `%s'", device);
 264                 if (ret == 0)
 265                         ret = WIMLIB_ERR_NTFS_3G;
 266         }
 267         return ret;
 268 }
 269
 270 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 271                                                 const char *device,
 272                                                 const char *name,
 273                                                 const char *description,
 274                                                 const char *flags_element,
 275                                                 int flags)
 276 {
 277         if (flags & (WIMLIB_ADD_IMAGE_FLAG_DEREFERENCE)) {
 278                 ERROR("Cannot dereference files when capturing directly from NTFS");
 279                 return WIMLIB_ERR_INVALID_PARAM;
 280         }
 281         return do_add_image(w, device, name, description, flags_element, flags,
 282                             build_dentry_tree_ntfs);
 283 }
 284
 285 #else /* WITH_NTFS_3G */
 286 WIMLIBAPI int wimlib_add_image_from_ntfs_volume(WIMStruct *w,
 287                                                 const char *device,
 288                                                 const char *name,
 289                                                 const char *description,
 290                                                 const char *flags_element,
 291                                                 int flags)
 292 {
 293         ERROR("wimlib was compiled without support for NTFS-3g, so");
 294         ERROR("we cannot capture a WIM image directly from a NTFS volume");
 295         return WIMLIB_ERR_UNSUPPORTED;
 296 }
 297 #endif /* WITH_NTFS_3G */