Merge "Add getfooter tool for crypto debugging" into android-4.4
This commit is contained in:
Dees Troy
Gerrit Code Review
@@ -356,6 +356,7 @@ ifeq ($(TW_INCLUDE_JB_CRYPTO), true)
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include $(commands_recovery_local_path)/crypto/fs_mgr/Android.mk
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include $(commands_recovery_local_path)/crypto/logwrapper/Android.mk
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include $(commands_recovery_local_path)/crypto/scrypt/Android.mk
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include $(commands_recovery_local_path)/crypto/crypttools/Android.mk
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endif
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ifeq ($(HAVE_SELINUX), true)
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include $(commands_recovery_local_path)/minzip/Android.mk
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@@ -0,0 +1,15 @@
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LOCAL_PATH:= $(call my-dir)
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include $(CLEAR_VARS)
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ifeq ($(TW_INCLUDE_JB_CRYPTO), true)
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LOCAL_SRC_FILES:= \
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getfooter.c
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LOCAL_CFLAGS:= -g -c -W
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LOCAL_MODULE:=getfooter
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LOCAL_MODULE_TAGS:= eng
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LOCAL_STATIC_LIBRARIES += libfs_mgrtwrp libc libcutils
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LOCAL_MODULE_CLASS := UTILITY_EXECUTABLES
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LOCAL_MODULE_PATH := $(PRODUCT_OUT)/utilities
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LOCAL_FORCE_STATIC_EXECUTABLE := true
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LOCAL_C_INCLUDES := bootable/recovery/crypto/jb/
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include $(BUILD_EXECUTABLE)
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endif
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@@ -0,0 +1,219 @@
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/dm-ioctl.h>
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#include <sys/mount.h>
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#include "../fs_mgr/include/fs_mgr.h"
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#include "cryptfs.h"
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#include "cutils/properties.h"
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#ifndef PROPERTY_VALUE_MAX
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#define PROPERTY_VALUE_MAX 255
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#endif
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#ifndef FSTAB_PREFIX
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#define FSTAB_PREFIX "/fstab."
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#endif
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#ifndef KEY_IN_FOOTER
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#define KEY_IN_FOOTER "footer"
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#endif
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struct fstab *fstab;
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static unsigned int get_blkdev_size(int fd)
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{
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unsigned int nr_sec;
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if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
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nr_sec = 0;
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}
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return nr_sec;
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}
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int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
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{
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static int cached_data = 0;
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static off64_t cached_off = 0;
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static char cached_metadata_fname[PROPERTY_VALUE_MAX] = "";
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int fd;
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char key_loc[PROPERTY_VALUE_MAX];
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char real_blkdev[PROPERTY_VALUE_MAX];
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unsigned int nr_sec;
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int rc = -1;
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fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc));
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if (!strcmp(key_loc, KEY_IN_FOOTER)) {
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if ( (fd = open(real_blkdev, O_RDWR)) < 0) {
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printf("Cannot open real block device %s\n", real_blkdev);
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return -1;
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}
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if ((nr_sec = get_blkdev_size(fd))) {
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/* If it's an encrypted Android partition, the last 16 Kbytes contain the
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* encryption info footer and key, and plenty of bytes to spare for future
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* growth.
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*/
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strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname));
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cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
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cached_data = 1;
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} else {
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printf("Cannot get size of block device %s\n", real_blkdev);
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}
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close(fd);
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} else {
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strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname));
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cached_off = 0;
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cached_data = 1;
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}
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if (cached_data) {
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if (metadata_fname) {
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*metadata_fname = cached_metadata_fname;
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}
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if (off) {
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*off = cached_off;
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}
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rc = 0;
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}
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return rc;
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}
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int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr)
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{
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int fd;
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unsigned int nr_sec, cnt;
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off64_t starting_off;
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int rc = -1;
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char *fname = NULL;
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struct stat statbuf;
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if (get_crypt_ftr_info(&fname, &starting_off)) {
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printf("Unable to get crypt_ftr_info\n");
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return -1;
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}
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if (fname[0] != '/') {
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printf("Unexpected value for crypto key location '%s'\n", fname);
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//return -1;
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}
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if ( (fd = open(fname, O_RDWR)) < 0) {
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printf("Cannot open footer file %s for get\n", fname);
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return -1;
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}
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/* Make sure it's 16 Kbytes in length */
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fstat(fd, &statbuf);
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if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) {
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printf("footer file %s is not the expected size!\n", fname);
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close(fd);
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return -1;
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}
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/* Seek to the start of the crypt footer */
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if (lseek64(fd, starting_off, SEEK_SET) == -1) {
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printf("Cannot seek to real block device footer\n");
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close(fd);
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return -1;
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}
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if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) {
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printf("Cannot read real block device footer\n");
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close(fd);
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return -1;
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}
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close(fd);
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return 0;
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}
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int main(void)
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{
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char key_loc[PROPERTY_VALUE_MAX];
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char blk_dev[PROPERTY_VALUE_MAX];
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char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
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struct stat st;
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struct crypt_mnt_ftr crypt_ftr;
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int fdout;
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printf("This tool comes with no warranties whatsoever.\n");
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printf("http://teamw.in\n\n");
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strcpy(fstab_filename, FSTAB_PREFIX);
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property_get("ro.hardware", fstab_filename + sizeof(FSTAB_PREFIX) - 1, "");
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if (stat(fstab_filename, &st) != 0) {
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printf("Cannot locate fstab file '%s'\n", fstab_filename);
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return -1;
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}
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fstab = fs_mgr_read_fstab(fstab_filename);
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if (!fstab) {
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printf("failed to open %s\n", fstab_filename);
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return -1;
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}
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fs_mgr_get_crypt_info(fstab, key_loc, blk_dev, sizeof(blk_dev));
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if (get_crypt_ftr_and_key(&crypt_ftr)) {
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printf("Error getting crypt footer and key\n");
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return -1;
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}
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if ( (fdout = open("/footerfile", O_WRONLY | O_CREAT, 0644)) < 0) {
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printf("Cannot open output file /footerfile\n");
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return -1;
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}
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if (write(fdout, (void*) &crypt_ftr, sizeof(struct crypt_mnt_ftr)) != sizeof(struct crypt_mnt_ftr)) {
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printf("Failed to write footer.\n");
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}
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close(fdout);
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if (!strcmp(key_loc, KEY_IN_FOOTER)) {
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unsigned int nr_sec, cnt;
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off64_t off = 0;
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char buffer[CRYPT_FOOTER_OFFSET];
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int fd;
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printf("\n\nDumping footer from '%s'...\n", blk_dev);
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if ( (fd = open(blk_dev, O_RDONLY)) < 0) {
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printf("Cannot open real block device %s\n", blk_dev);
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return -1;
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}
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if ((nr_sec = get_blkdev_size(fd))) {
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off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
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} else {
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printf("Cannot get size of block device %s\n", blk_dev);
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close(fd);
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return -1;
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}
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printf("Size is %llu, offset is %llu\n", ((off64_t)nr_sec * 512), off);
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if (lseek64(fd, off, SEEK_SET) == -1) {
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printf("Cannot seek to real block device footer\n");
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close(fd);
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return -1;
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}
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if ( (cnt = read(fd, buffer, sizeof(buffer))) != sizeof(buffer)) {
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printf("Cannot read real block device footer\n");
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close(fd);
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return -1;
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}
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close(fd);
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if ( (fdout = open("/footerdump", O_WRONLY | O_CREAT, 0644)) < 0) {
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printf("Cannot open output file /footerdump\n");
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return -1;
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}
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if (write(fdout, buffer, sizeof(buffer)) != sizeof(buffer)) {
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printf("Failed to write footer.\n");
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}
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close(fdout);
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}
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return 0;
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}
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