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-rw-r--r--tools/idevicebackup.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/tools/idevicebackup.c b/tools/idevicebackup.c
index 2018bc6..15b8d05 100644
--- a/tools/idevicebackup.c
+++ b/tools/idevicebackup.c
@@ -26,6 +26,7 @@
#include <stdlib.h>
#include <signal.h>
#include <glib.h>
+#include <gcrypt.h>
#include <libimobiledevice/libimobiledevice.h>
#include <libimobiledevice/lockdown.h>
@@ -59,6 +60,23 @@ enum device_link_file_status_t {
DEVICE_LINK_FILE_STATUS_LAST_HUNK
};
+static void sha1_of_data(const char *input, uint32_t size, unsigned char *hash_out)
+{
+ gcry_md_hash_buffer(GCRY_MD_SHA1, hash_out, input, size);
+}
+
+static int compare_hash(const unsigned char *hash1, const unsigned char *hash2, int hash_len)
+{
+ int i;
+ for (i = 0; i < hash_len; i++) {
+ if (hash1[i] != hash2[i]) {
+ return 0;
+ }
+ }
+ return 1;
+}
+
+
static void notify_cb(const char *notification, void *userdata)
{
if (!strcmp(notification, NP_SYNC_CANCEL_REQUEST)) {
@@ -913,6 +931,58 @@ int main(int argc, char *argv[])
break;
}
/* now make sure backup integrity is ok! verify all files */
+ printf("Reading existing Manifest.\n");
+ plist_read_from_filename(&manifest_plist, manifest_path);
+ if (!manifest_plist) {
+ printf("Could not read Manifest.plist. Aborting.\n");
+ break;
+ }
+
+ printf("Verifying backup integrity, please wait.\n");
+ char *bin = NULL;
+ uint64_t binsize = 0;
+ node = plist_dict_get_item(manifest_plist, "Data");
+ if (!node || (plist_get_node_type(node) != PLIST_DATA)) {
+ printf("Could not read Data key from Manifest.plist!\n");
+ break;
+ }
+ plist_get_data_val(node, &bin, &binsize);
+ plist_t backup_data = NULL;
+ if (bin) {
+ char *auth_ver = NULL;
+ unsigned char *auth_sig = NULL;
+ uint64_t auth_sig_len = 0;
+ /* verify AuthSignature */
+ node = plist_dict_get_item(manifest_plist, "AuthVersion");
+ plist_get_string_val(node, &auth_ver);
+ if (auth_ver && (strcmp(auth_ver, "2.0") == 0)) {
+ node = plist_dict_get_item(manifest_plist, "AuthSignature");
+ if (node && (plist_get_node_type(node) == PLIST_DATA)) {
+ plist_get_data_val(node, (char**)&auth_sig, &auth_sig_len);
+ }
+ if (auth_sig && (auth_sig_len == 20)) {
+ /* calculate the sha1, then compare */
+ unsigned char data_sha1[20];
+ sha1_of_data(bin, binsize, data_sha1);
+ if (compare_hash(auth_sig, data_sha1, 20)) {
+ printf("AuthSignature is valid\n");
+ } else {
+ printf("ERROR: AuthSignature is NOT VALID\n");
+ }
+ } else {
+ printf("Could not get AuthSignature from manifest!\n");
+ }
+ g_free(auth_sig);
+ } else if (auth_ver) {
+ printf("Unknown AuthVersion '%s', cannot verify AuthSignature\n", auth_ver);
+ }
+ plist_from_bin(bin, (uint32_t)binsize, &backup_data);
+ g_free(bin);
+ }
+ if (!backup_data) {
+ 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 */
/* request restore from device with manifest (BackupMessageRestoreMigrate) */