int main(void)
{
char prop[PROPERTY_VALUE_MAX];
char key_loc[PROPERTY_VALUE_MAX];
char blk_dev[PROPERTY_VALUE_MAX];
char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
printf("This tool will gather the build flags needed for decryption support for TWRP.\n");
printf("This tool comes with no warranties whatsoever.\n");
printf("http://teamw.in\n\n");
property_get("ro.crypto.state", prop, "encrypted");
if (strcmp(prop, "encrypted") != 0)
printf("Your device is not encrypted, continuing anyway.\n\nTW_INCLUDE_CRYPTO := true\n");
property_get("ro.crypto.fs_type", prop, "ERROR");
printf("TW_CRYPTO_FS_TYPE := \"%s\"\n", prop);
property_get("ro.crypto.fs_real_blkdev", prop, "ERROR");
printf("TW_CRYPTO_REAL_BLKDEV := \"%s\"\n", prop);
property_get("ro.crypto.fs_mnt_point", prop, "ERROR");
printf("TW_CRYPTO_MNT_POINT := \"%s\"\n", prop);
property_get("ro.crypto.fs_options", prop, "ERROR");
printf("TW_CRYPTO_FS_OPTIONS := \"%s\"\n", prop);
property_get("ro.crypto.fs_flags", prop, "ERROR");
printf("TW_CRYPTO_FS_FLAGS := \"%s\"\n", prop);
property_get("ro.crypto.keyfile.userdata", prop, "footer");
printf("TW_CRYPTO_KEY_LOC := \"%s\"\n", prop);
printf("\n*** NEW FOR JELLY BEAN:\n");
strcpy(fstab_filename, FSTAB_PREFIX);
property_get("ro.hardware", fstab_filename + sizeof(FSTAB_PREFIX) - 1, "");
fs_mgr_get_crypt_info(fstab_filename, key_loc, blk_dev, sizeof(key_loc));
printf("fstab file location: '%s'\n\nTW_INCLUDE_JB_CRYPTO := true\n", fstab_filename);
return 0;
}
int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
{
static int cached_data = 0;
static off64_t cached_off = 0;
static char cached_metadata_fname[PROPERTY_VALUE_MAX] = "";
int fd;
char key_loc[PROPERTY_VALUE_MAX];
char real_blkdev[PROPERTY_VALUE_MAX];
unsigned int nr_sec;
int rc = -1;
fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc));
if (!strcmp(key_loc, KEY_IN_FOOTER)) {
if ( (fd = open(real_blkdev, O_RDWR)) < 0) {
printf("Cannot open real block device %s\n", real_blkdev);
return -1;
}
if ((nr_sec = get_blkdev_size(fd))) {
/* If it's an encrypted Android partition, the last 16 Kbytes contain the
* encryption info footer and key, and plenty of bytes to spare for future
* growth.
*/
strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname));
cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
cached_data = 1;
} else {
printf("Cannot get size of block device %s\n", real_blkdev);
}
close(fd);
} else {
strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname));
cached_off = 0;
cached_data = 1;
}
if (cached_data) {
if (metadata_fname) {
*metadata_fname = cached_metadata_fname;
}
if (off) {
*off = cached_off;
}
rc = 0;
}
return rc;
}
int fs_mgr_mount_all(struct fstab *fstab)
{
int i = 0;
int encrypted = 0;
int ret = -1;
int mret;
if (!fstab) {
return ret;
}
char key_loc[PROPERTY_VALUE_MAX];
fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
for (i = 0; i < fstab->num_entries; i++) {
/* Don't mount entries that are managed by vold */
if (fstab->recs[i].fs_mgr_flags & (MF_VOLDMANAGED | MF_RECOVERYONLY)) {
continue;
}
/* Skip swap and raw partition entries such as boot, recovery, etc */
if (!strcmp(fstab->recs[i].fs_type, "swap") ||
!strcmp(fstab->recs[i].fs_type, "emmc") ||
!strcmp(fstab->recs[i].fs_type, "mtd")) {
continue;
}
if (fstab->recs[i].fs_mgr_flags & MF_WAIT) {
wait_for_file(fstab->recs[i].blk_device, WAIT_TIMEOUT);
}
if (fstab->recs[i].fs_mgr_flags & MF_CHECK) {
check_fs(fstab->recs[i].blk_device, fstab->recs[i].fs_type,
fstab->recs[i].mount_point,true,
key_loc,fstab->recs[i].fs_mgr_flags & MF_CRYPT);
}
if (fstab->recs[i].fs_mgr_flags & MF_VERIFY) {
if (fs_mgr_setup_verity(&fstab->recs[i]) < 0) {
ERROR("Could not set up verified partition, skipping!");
continue;
}
}
mret = __mount(fstab->recs[i].blk_device, fstab->recs[i].mount_point,
fstab->recs[i].fs_type, fstab->recs[i].flags,
fstab->recs[i].fs_options);
if (!mret) {
/* Success! Go get the next one */
continue;
}
/* mount(2) returned an error, check if it's encrypted and deal with it */
if ((fstab->recs[i].fs_mgr_flags & MF_CRYPT) &&
!partition_wiped(fstab->recs[i].blk_device)) {
/* Need to mount a tmpfs at this mountpoint for now, and set
* properties that vold will query later for decrypting
*/
if (mount("tmpfs", fstab->recs[i].mount_point, "tmpfs",
MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS) < 0) {
ERROR("Cannot mount tmpfs filesystem for encrypted fs at %s\n",
fstab->recs[i].mount_point);
goto out;
}
encrypted = 1;
} else {
ERROR("Cannot mount filesystem on %s at %s\n",
fstab->recs[i].blk_device, fstab->recs[i].mount_point);
goto out;
}
}
if (encrypted) {
ret = 1;
} else {
ret = 0;
}
out:
return ret;
}
int main(void)
{
char key_loc[PROPERTY_VALUE_MAX];
char blk_dev[PROPERTY_VALUE_MAX];
char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
struct stat st;
struct crypt_mnt_ftr crypt_ftr;
int fdout;
printf("This tool comes with no warranties whatsoever.\n");
printf("http://teamw.in\n\n");
strcpy(fstab_filename, FSTAB_PREFIX);
property_get("ro.hardware", fstab_filename + sizeof(FSTAB_PREFIX) - 1, "");
if (stat(fstab_filename, &st) != 0) {
printf("Cannot locate fstab file '%s'\n", fstab_filename);
return -1;
}
fstab = fs_mgr_read_fstab(fstab_filename);
if (!fstab) {
printf("failed to open %s\n", fstab_filename);
return -1;
}
fs_mgr_get_crypt_info(fstab, key_loc, blk_dev, sizeof(blk_dev));
if (get_crypt_ftr_and_key(&crypt_ftr)) {
printf("Error getting crypt footer and key\n");
return -1;
}
if ( (fdout = open("/footerfile", O_WRONLY | O_CREAT, 0644)) < 0) {
printf("Cannot open output file /footerfile\n");
return -1;
}
if (write(fdout, (void*) &crypt_ftr, sizeof(struct crypt_mnt_ftr)) != sizeof(struct crypt_mnt_ftr)) {
printf("Failed to write footer.\n");
}
close(fdout);
if (!strcmp(key_loc, KEY_IN_FOOTER)) {
unsigned int nr_sec, cnt;
off64_t off = 0;
char buffer[CRYPT_FOOTER_OFFSET];
int fd;
printf("\n\nDumping footer from '%s'...\n", blk_dev);
if ( (fd = open(blk_dev, O_RDONLY)) < 0) {
printf("Cannot open real block device %s\n", blk_dev);
return -1;
}
if ((nr_sec = get_blkdev_size(fd))) {
off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
} else {
printf("Cannot get size of block device %s\n", blk_dev);
close(fd);
return -1;
}
printf("Size is %llu, offset is %llu\n", ((off64_t)nr_sec * 512), off);
if (lseek64(fd, off, SEEK_SET) == -1) {
printf("Cannot seek to real block device footer\n");
close(fd);
return -1;
}
if ( (cnt = read(fd, buffer, sizeof(buffer))) != sizeof(buffer)) {
printf("Cannot read real block device footer\n");
close(fd);
return -1;
}
close(fd);
if ( (fdout = open("/footerdump", O_WRONLY | O_CREAT, 0644)) < 0) {
printf("Cannot open output file /footerdump\n");
return -1;
}
if (write(fdout, buffer, sizeof(buffer)) != sizeof(buffer)) {
printf("Failed to write footer.\n");
}
close(fdout);
}
return 0;
}