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-rw-r--r--tools/idevicebackup.c243
1 files changed, 241 insertions, 2 deletions
diff --git a/tools/idevicebackup.c b/tools/idevicebackup.c
index 15b8d05..0a7fd70 100644
--- a/tools/idevicebackup.c
+++ b/tools/idevicebackup.c
@@ -76,6 +76,62 @@ static int compare_hash(const unsigned char *hash1, const unsigned char *hash2,
return 1;
}
+static void compute_datahash(const char *path, const char *destpath, uint8_t greylist, const char *domain, const char *appid, const char *version, unsigned char *hash_out)
+{
+ gcry_md_hd_t hd = NULL;
+ gcry_md_open(&hd, GCRY_MD_SHA1, 0);
+ if (!hd) {
+ printf("ERROR: Could not initialize libgcrypt/SHA1\n");
+ return;
+ }
+ gcry_md_reset(hd);
+
+ FILE *f = fopen(path, "rb");
+ if (f) {
+ unsigned char buf[16384];
+ size_t len;
+ while ((len = fread(buf, 1, 16384, f)) > 0) {
+ gcry_md_write(hd, buf, len);
+ }
+ fclose(f);
+ gcry_md_write(hd, destpath, strlen(destpath));
+ gcry_md_write(hd, ";", 1);
+ if (greylist == 1) {
+ gcry_md_write(hd, "true", 4);
+ } else {
+ gcry_md_write(hd, "false", 5);
+ }
+ gcry_md_write(hd, ";", 1);
+ if (domain) {
+ gcry_md_write(hd, domain, strlen(domain));
+ } else {
+ gcry_md_write(hd, "(null)", 6);
+ }
+ gcry_md_write(hd, ";", 1);
+ if (appid) {
+ gcry_md_write(hd, appid, strlen(appid));
+ } else {
+ gcry_md_write(hd, "(null)", 6);
+ }
+ gcry_md_write(hd, ";", 1);
+ if (version) {
+ gcry_md_write(hd, version, strlen(version));
+ } else {
+ gcry_md_write(hd, "(null)", 6);
+ }
+ unsigned char *newhash = gcry_md_read(hd, GCRY_MD_SHA1);
+ memcpy(hash_out, newhash, 20);
+ }
+ gcry_md_close(hd);
+}
+
+static void print_hash(const unsigned char *hash, int len)
+{
+ int i;
+ for (i = 0; i < len; i++) {
+ printf("%02x", hash[i]);
+ }
+}
static void notify_cb(const char *notification, void *userdata)
{
@@ -399,6 +455,157 @@ static int mobilebackup_delete_backup_file_by_hash(const char *backup_directory,
return ret;
}
+static int mobilebackup_check_file_integrity(const char *backup_directory, const char *hash, plist_t filedata)
+{
+ char *datapath;
+ char *infopath;
+ plist_t mdinfo = NULL;
+ struct stat st;
+ unsigned char file_hash[20];
+
+ datapath = mobilebackup_build_path(backup_directory, hash, ".mddata");
+ if (stat(datapath, &st) != 0) {
+ printf("\r\n");
+ printf("ERROR: '%s.mddata' is missing!\n", hash);
+ free(datapath);
+ return 0;
+ }
+
+ infopath = mobilebackup_build_path(backup_directory, hash, ".mdinfo");
+ plist_read_from_filename(&mdinfo, infopath);
+ free(infopath);
+ if (!mdinfo) {
+ printf("\r\n");
+ printf("ERROR: '%s.mdinfo' is missing or corrupted!\n", hash);
+ free(datapath);
+ return 0;
+ }
+
+ /* sha1 hash verification */
+ plist_t node = plist_dict_get_item(filedata, "DataHash");
+ if (!node || (plist_get_node_type(node) != PLIST_DATA)) {
+ printf("\r\n");
+ printf("ERROR: Could not get DataHash for file entry '%s'\n", hash);
+ plist_free(mdinfo);
+ free(datapath);
+ return 0;
+ }
+
+ node = plist_dict_get_item(mdinfo, "Metadata");
+ if (!node && (plist_get_node_type(node) != PLIST_DATA)) {
+ printf("\r\n");
+ printf("ERROR: Could not find Metadata in plist '%s.mdinfo'\n", hash);
+ plist_free(mdinfo);
+ free(datapath);
+ return 0;
+ }
+
+ char *meta_bin = NULL;
+ uint64_t meta_bin_size = 0;
+ plist_get_data_val(node, &meta_bin, &meta_bin_size);
+ plist_t metadata = NULL;
+ if (meta_bin) {
+ plist_from_bin(meta_bin, (uint32_t)meta_bin_size, &metadata);
+ }
+ if (!metadata) {
+ printf("\r\n");
+ printf("ERROR: Could not get Metadata from plist '%s.mdinfo'\n", hash);
+ plist_free(mdinfo);
+ free(datapath);
+ return 0;
+ }
+
+ char *version = NULL;
+ node = plist_dict_get_item(metadata, "Version");
+ if (node && (plist_get_node_type(node) == PLIST_STRING)) {
+ plist_get_string_val(node, &version);
+ }
+
+ char *destpath = NULL;
+ node = plist_dict_get_item(metadata, "Path");
+ if (node && (plist_get_node_type(node) == PLIST_STRING)) {
+ plist_get_string_val(node, &destpath);
+ }
+
+ uint8_t greylist = 0;
+ node = plist_dict_get_item(metadata, "Greylist");
+ if (node && (plist_get_node_type(node) == PLIST_BOOLEAN)) {
+ plist_get_bool_val(node, &greylist);
+ }
+
+ char *domain = NULL;
+ node = plist_dict_get_item(metadata, "Domain");
+ if (node && (plist_get_node_type(node) == PLIST_STRING)) {
+ plist_get_string_val(node, &domain);
+ }
+
+ char *fnstr = malloc(strlen(domain) + 1 + strlen(destpath) + 1);
+ strcpy(fnstr, domain);
+ strcat(fnstr, "-");
+ strcat(fnstr, destpath);
+ unsigned char fnhash[20];
+ char fnamehash[41];
+ char *p = fnamehash;
+ sha1_of_data(fnstr, strlen(fnstr), fnhash);
+ free(fnstr);
+ int i;
+ for ( i = 0; i < 20; i++, p += 2 ) {
+ snprintf (p, 3, "%02x", (unsigned char)fnhash[i] );
+ }
+ if (strcmp(fnamehash, hash)) {
+ printf("\r\n");
+ printf("WARNING: filename hash does not match for entry '%s'\n", hash);
+ }
+
+ char *auth_version = NULL;
+ node = plist_dict_get_item(mdinfo, "AuthVersion");
+ if (node && (plist_get_node_type(node) == PLIST_STRING)) {
+ plist_get_string_val(node, &auth_version);
+ }
+
+ if (strcmp(auth_version, "1.0")) {
+ printf("\r\n");
+ printf("WARNING: Unknown AuthVersion '%s', DataHash cannot be verified!\n", auth_version);
+ }
+
+ node = plist_dict_get_item(filedata, "DataHash");
+ if (!node || (plist_get_node_type(node) != PLIST_DATA)) {
+ printf("\r\n");
+ printf("WARNING: Could not get DataHash key from file info data for entry '%s'\n", hash);
+ }
+
+ int res = 1;
+ unsigned char *data_hash = NULL;
+ uint64_t data_hash_len = 0;
+ plist_get_data_val(node, (char**)&data_hash, &data_hash_len);
+ int hash_ok = 0;
+ if (data_hash && (data_hash_len == 20)) {
+ compute_datahash(datapath, destpath, greylist, domain, NULL, version, file_hash);
+ hash_ok = compare_hash(data_hash, file_hash, 20);
+ } else if (data_hash_len == 0) {
+ /* no datahash present */
+ hash_ok = 1;
+ }
+
+ g_free(domain);
+ g_free(version);
+ g_free(destpath);
+
+ if (!hash_ok) {
+ printf("\r\n");
+ printf("ERROR: The hash for '%s.mddata' does not match DataHash entry in Manifest\n", hash);
+ printf("datahash: ");
+ print_hash(data_hash, 20);
+ printf("\nfilehash: ");
+ print_hash(file_hash, 20);
+ printf("\n");
+ res = 0;
+ }
+ g_free(data_hash);
+ plist_free(mdinfo);
+ return res;
+}
+
static void do_post_notification(const char *notification)
{
uint16_t nport = 0;
@@ -983,8 +1190,40 @@ int main(int argc, char *argv[])
printf("Could not read plist from Manifest.plist Data key!\n");
break;
}
- /* loop over Files entries in Manifest data plist */
- /* make sure both .mddata/.mdinfo files are available for each entry */
+ plist_t files = plist_dict_get_item(backup_data, "Files");
+ if (files && (plist_get_node_type(files) == PLIST_DICT)) {
+ plist_dict_iter iter = NULL;
+ plist_dict_new_iter(files, &iter);
+ if (iter) {
+ /* loop over Files entries in Manifest data plist */
+ char *hash = NULL;
+ int file_ok = 0;
+ int total_files = plist_dict_get_size(files);
+ int cur_file = 1;
+ node = NULL;
+ plist_dict_next_item(files, iter, &hash, &node);
+ while (node) {
+ printf("Verifying files %d/%d (%d%%) \r", cur_file, total_files, (cur_file*100/total_files));
+ cur_file++;
+ /* make sure both .mddata/.mdinfo files are available for each entry */
+ file_ok = mobilebackup_check_file_integrity(backup_directory, hash, node);
+ node = NULL;
+ free(hash);
+ hash = NULL;
+ if (!file_ok) {
+ break;
+ }
+ plist_dict_next_item(files, iter, &hash, &node);
+ }
+ printf("\n");
+ free(iter);
+ if (!file_ok) {
+ plist_free(backup_data);
+ break;
+ }
+ printf("All backup files appear to be valid\n");
+ }
+ }
/* request restore from device with manifest (BackupMessageRestoreMigrate) */
/* loop over Files entries in Manifest data plist */
/* read mddata/mdinfo files and send to device using DLSendFile */
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