cryptfs.c revision e919efea94b178ed214ed2e78ef0d008727d62ab
18f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* 28f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Copyright (C) 2010 The Android Open Source Project 38f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * 48f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Licensed under the Apache License, Version 2.0 (the "License"); 58f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * you may not use this file except in compliance with the License. 68f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * You may obtain a copy of the License at 78f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * 88f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * http://www.apache.org/licenses/LICENSE-2.0 98f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * 108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Unless required by applicable law or agreed to in writing, software 118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * distributed under the License is distributed on an "AS IS" BASIS, 128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * See the License for the specific language governing permissions and 148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * limitations under the License. 158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* TO DO: 188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * 1. Perhaps keep several copies of the encrypted key, in case something 198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * goes horribly wrong? 208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * 218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/types.h> 248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/stat.h> 258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <fcntl.h> 268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <unistd.h> 278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <stdio.h> 288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/ioctl.h> 298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <linux/dm-ioctl.h> 308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <libgen.h> 318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <stdlib.h> 328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/param.h> 338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <string.h> 348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/mount.h> 358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <openssl/evp.h> 368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#include <openssl/sha.h> 378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <errno.h> 38c290eaf6852c6318584926c5e39b27672638891fKen Sumrall#include <cutils/android_reboot.h> 393ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall#include <ext4.h> 4029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall#include <linux/kdev_t.h> 41e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall#include <fs_mgr.h> 428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cryptfs.h" 438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define LOG_TAG "Cryptfs" 44ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood#include "cutils/android_reboot.h" 458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/log.h" 468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/properties.h" 475d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall#include "hardware_legacy/power.h" 4829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall#include "VolumeManager.h" 498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define DM_CRYPT_BUF_SIZE 4096 518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define DATA_MNT_POINT "/data" 528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5370a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks#define HASH_COUNT 2000 5470a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks#define KEY_LEN_BYTES 16 5570a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks#define IV_LEN_BYTES 16 5670a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks 5729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall#define KEY_IN_FOOTER "footer" 5829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 5929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall#define EXT4_FS 1 6029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall#define FAT_FS 2 6129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 62e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall#define TABLE_LOAD_RETRIES 10 63e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall 648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallchar *me = "cryptfs"; 658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6670a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parksstatic unsigned char saved_master_key[KEY_LEN_BYTES]; 6729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallstatic char *saved_data_blkdev; 683ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrallstatic char *saved_mount_point; 6970a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parksstatic int master_key_saved = 0; 70e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall#define FSTAB_PREFIX "/fstab." 71e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrallstatic char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)]; 728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) 748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall memset(io, 0, dataSize); 768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_size = dataSize; 778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_start = sizeof(struct dm_ioctl); 788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[0] = 4; 798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[1] = 0; 808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[2] = 0; 818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->flags = flags; 828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (name) { 838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strncpy(io->name, name, sizeof(io->name)); 848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 873ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrallstatic unsigned int get_fs_size(char *dev) 883ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall{ 893ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall int fd, block_size; 903ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall struct ext4_super_block sb; 913ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall off64_t len; 923ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 933ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if ((fd = open(dev, O_RDONLY)) < 0) { 943ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot open device to get filesystem size "); 953ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return 0; 963ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 973ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 983ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (lseek64(fd, 1024, SEEK_SET) < 0) { 993ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot seek to superblock"); 1003ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return 0; 1013ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 1023ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 1033ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { 1043ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot read superblock"); 1053ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return 0; 1063ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 1073ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 1083ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall close(fd); 1093ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 1103ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall block_size = 1024 << sb.s_log_block_size; 1113ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* compute length in bytes */ 1123ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; 1133ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 1143ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* return length in sectors */ 1153ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return (unsigned int) (len / 512); 1163ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall} 1173ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 1188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic unsigned int get_blkdev_size(int fd) 1198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec; 1218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { 1238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nr_sec = 0; 1248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return nr_sec; 1278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 1288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 129e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall/* Get and cache the name of the fstab file so we don't 130e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall * keep talking over the socket to the property service. 131e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall */ 132e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrallstatic char *get_fstab_filename(void) 133e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall{ 134e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall if (fstab_filename[0] == 0) { 135e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall strcpy(fstab_filename, FSTAB_PREFIX); 136e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall property_get("ro.hardware", fstab_filename + sizeof(FSTAB_PREFIX) - 1, ""); 137e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall } 138e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall 139e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall return fstab_filename; 140e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall} 141e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall 142e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall/* key or salt can be NULL, in which case just skip writing that value. Useful to 1438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * update the failed mount count but not change the key. 1448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int put_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 146e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *key, unsigned char *salt) 1478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 1498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 1508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 1518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 15229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char *fname; 15329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char key_loc[PROPERTY_VALUE_MAX]; 1543be890f59c04f94537f2f66f1d2841ed591f1a6eKen Sumrall struct stat statbuf; 1558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 156e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc)); 1578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 15829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!strcmp(key_loc, KEY_IN_FOOTER)) { 15929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fname = real_blk_name; 16029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (fd = open(fname, O_RDWR)) < 0) { 16129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot open real block device %s\n", fname); 16229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1; 16329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 1648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 16529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 16629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot get size of block device %s\n", fname); 16729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto errout; 16829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 1698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 17029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 17129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * encryption info footer and key, and plenty of bytes to spare for future 17229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * growth. 17329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall */ 17429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 17529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 17629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 17729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot seek to real block device footer\n"); 17829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto errout; 17929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 18029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else if (key_loc[0] == '/') { 18129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fname = key_loc; 18229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) { 18329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot open footer file %s\n", fname); 18429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1; 18529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 18629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else { 187e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall SLOGE("Unexpected value for crypto key location\n"); 18829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1;; 1898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 1928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write real block device footer\n"); 1938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (key) { 19770a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks if (crypt_ftr->keysize != KEY_LEN_BYTES) { 1988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 19929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall crypt_ftr->keysize*8, fname); 2008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 20429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot write key for real block device %s\n", fname); 2058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 209e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (salt) { 21029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Compute the offset from the last write to the salt */ 21129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off = KEY_TO_SALT_PADDING; 21229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (! key) 21329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off += crypt_ftr->keysize; 214e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 21529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (lseek64(fd, off, SEEK_CUR) == -1) { 216e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall SLOGE("Cannot seek to real block device salt \n"); 217e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 218e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 219e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 220e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if ( (cnt = write(fd, salt, SALT_LEN)) != SALT_LEN) { 22129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot write salt for real block device %s\n", fname); 22229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto errout; 22329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 22429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 22529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 2263be890f59c04f94537f2f66f1d2841ed591f1a6eKen Sumrall fstat(fd, &statbuf); 2273be890f59c04f94537f2f66f1d2841ed591f1a6eKen Sumrall /* If the keys are kept on a raw block device, do not try to truncate it. */ 2283be890f59c04f94537f2f66f1d2841ed591f1a6eKen Sumrall if (S_ISREG(statbuf.st_mode) && (key_loc[0] == '/')) { 22929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (ftruncate(fd, 0x4000)) { 2303be890f59c04f94537f2f66f1d2841ed591f1a6eKen Sumrall SLOGE("Cannot set footer file size\n", fname); 231e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 232e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 233e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 234e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 2358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 2368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 2378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 2398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 2408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 2418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 245e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *key, unsigned char *salt) 2468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 2478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 2488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 2498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 2508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 25129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char key_loc[PROPERTY_VALUE_MAX]; 25229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char *fname; 25329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall struct stat statbuf; 2548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 255e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc)); 2568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 25729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!strcmp(key_loc, KEY_IN_FOOTER)) { 25829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fname = real_blk_name; 25929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (fd = open(fname, O_RDONLY)) < 0) { 26029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot open real block device %s\n", fname); 26129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1; 26229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 2638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 26429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 26529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot get size of block device %s\n", fname); 26629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto errout; 26729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 2688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 26929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 27029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * encryption info footer and key, and plenty of bytes to spare for future 27129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * growth. 27229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall */ 27329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 27429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 27529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 27629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot seek to real block device footer\n"); 27729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto errout; 27829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 27929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else if (key_loc[0] == '/') { 28029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fname = key_loc; 28129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (fd = open(fname, O_RDONLY)) < 0) { 28229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot open footer file %s\n", fname); 28329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1; 28429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 28529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 28629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Make sure it's 16 Kbytes in length */ 28729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fstat(fd, &statbuf); 2883be890f59c04f94537f2f66f1d2841ed591f1a6eKen Sumrall if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { 28929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("footer file %s is not the expected size!\n", fname); 29029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto errout; 29129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 29229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else { 293e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall SLOGE("Unexpected value for crypto key location\n"); 29429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1;; 2958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 2988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read real block device footer\n"); 2998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { 30329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Bad magic for real block device %s\n", fname); 3048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->major_version != 1) { 3088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot understand major version %d real block device footer\n", 3098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->major_version); 3108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->minor_version != 0) { 3148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n", 3158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->minor_version); 3168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->ftr_size > sizeof(struct crypt_mnt_ftr)) { 3198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* the footer size is bigger than we expected. 3208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Skip to it's stated end so we can read the key. 3218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 3228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr), SEEK_CUR) == -1) { 3238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to start of key\n"); 3248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 32870a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks if (crypt_ftr->keysize != KEY_LEN_BYTES) { 3298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 33029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall crypt_ftr->keysize * 8, fname); 3318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 33529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot read key for real block device %s\n", fname); 3368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 339e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (lseek64(fd, KEY_TO_SALT_PADDING, SEEK_CUR) == -1) { 340e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall SLOGE("Cannot seek to real block device salt\n"); 341e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 342e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 343e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 344e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if ( (cnt = read(fd, salt, SALT_LEN)) != SALT_LEN) { 34529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot read salt for real block device %s\n", fname); 346e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 347e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 348e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 3498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 3508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 3518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 3548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 3558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Convert a binary key of specified length into an ascii hex string equivalent, 3588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * without the leading 0x and with null termination 3598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 3608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallvoid convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, 3618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *master_key_ascii) 3628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int i, a; 3648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char nibble; 3658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0, a=0; i<keysize; i++, a+=2) { 3678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* For each byte, write out two ascii hex digits */ 3688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = (master_key[i] >> 4) & 0xf; 3698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); 3708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = master_key[i] & 0xf; 3728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); 3738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Add the null termination */ 3768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = '\0'; 3778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, 38129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char *real_blk_name, char *crypto_blk_name, const char *name) 3828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 3848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ 3858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *crypt_params; 3868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 3878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_target_spec *tgt; 3888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int minor; 3898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 390e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall int i; 3918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 3928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 3948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 3958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 3998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 4018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_CREATE, io)) { 4028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot create dm-crypt device\n"); 4038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 4048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Get the device status, in particular, the name of it's device file */ 4078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 4088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_STATUS, io)) { 4098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot retrieve dm-crypt device status\n"); 4108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 4118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); 4138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); 4148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Load the mapping table for this device */ 4168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; 4178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 4198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->target_count = 1; 4208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->status = 0; 4218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->sector_start = 0; 4228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->length = crypt_ftr->fs_size; 4238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strcpy(tgt->target_type, "crypt"); 4248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); 4268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); 4278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(crypt_params, "%s %s 0 %s 0", crypt_ftr->crypto_type_name, 4288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii, real_blk_name); 4298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params += strlen(crypt_params) + 1; 4308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ 4318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->next = crypt_params - buffer; 4328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 433e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall for (i = 0; i < TABLE_LOAD_RETRIES; i++) { 434e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall if (! ioctl(fd, DM_TABLE_LOAD, io)) { 435e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall break; 436e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall } 437e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall usleep(500000); 438e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall } 439e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall 440e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall if (i == TABLE_LOAD_RETRIES) { 4418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot load dm-crypt mapping table.\n"); 4428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 443e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall } else if (i) { 444e919efea94b178ed214ed2e78ef0d008727d62abKen Sumrall SLOGI("Took %d tries to load dmcrypt table.\n", i + 1); 4458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Resume this device to activate it */ 4488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 4498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_SUSPEND, io)) { 4518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot resume the dm-crypt device\n"); 4528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 4538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 4568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 4578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 4598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 4608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 4628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 46429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallstatic int delete_crypto_blk_dev(char *name) 4658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 4678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 4688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 4698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 4708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 4728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 4738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 4748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 4778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 4798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_REMOVE, io)) { 4808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot remove dm-crypt device\n"); 4818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 4828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 4858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 4868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 4888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 4898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 4918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 494e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey) 4958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 497e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, SALT_LEN, 4988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); 4998ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 5008ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 501e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic int encrypt_master_key(char *passwd, unsigned char *salt, 502e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *decrypted_master_key, 5038ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char *encrypted_master_key) 5048ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 5058ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 5068ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall EVP_CIPHER_CTX e_ctx; 5078ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int encrypted_len, final_len; 5088ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5098ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 510e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall pbkdf2(passwd, salt, ikey); 5118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 5138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 5148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptInit failed\n"); 5158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ 5188ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Encrypt the master key */ 5208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, 5218ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall decrypted_master_key, KEY_LEN_BYTES)) { 5228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptUpdate failed\n"); 5238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5258ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { 5268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptFinal failed\n"); 5278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (encrypted_len + final_len != KEY_LEN_BYTES) { 5318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); 5328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 5348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 5358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 5378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 538e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic int decrypt_master_key(char *passwd, unsigned char *salt, 539e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *encrypted_master_key, 5408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *decrypted_master_key) 5418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 5438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX d_ctx; 5448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int decrypted_len, final_len; 5458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 547e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall pbkdf2(passwd, salt, ikey); 5488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 5508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 5518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ 5548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Decrypt the master key */ 5558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, 5568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall encrypted_master_key, KEY_LEN_BYTES)) { 5578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { 5608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (decrypted_len + final_len != KEY_LEN_BYTES) { 5648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 5668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 5678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 5698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 570e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt) 5718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 5728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int fd; 573e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char key_buf[KEY_LEN_BYTES]; 5748ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall EVP_CIPHER_CTX e_ctx; 5758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int encrypted_len, final_len; 5768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5778ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Get some random bits for a key */ 5788ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall fd = open("/dev/urandom", O_RDONLY); 579e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall read(fd, key_buf, sizeof(key_buf)); 580e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall read(fd, salt, SALT_LEN); 5818ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall close(fd); 5828ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5838ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Now encrypt it with the password */ 584e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall return encrypt_master_key(passwd, salt, key_buf, master_key); 5858ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 5868ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int wait_and_unmount(char *mountpoint) 5888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int i, rc; 5902eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall#define WAIT_UNMOUNT_COUNT 20 5918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now umount the tmpfs filesystem */ 5938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { 5948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (umount(mountpoint)) { 59529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (errno == EINVAL) { 59629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* EINVAL is returned if the directory is not a mountpoint, 59729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * i.e. there is no filesystem mounted there. So just get out. 59829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall */ 59929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall break; 60029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 6018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 6028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall i++; 6038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall break; 6058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (i < WAIT_UNMOUNT_COUNT) { 6098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("unmounting %s succeeded\n", mountpoint); 6108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 6118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("unmounting %s failed\n", mountpoint); 6138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = -1; 6148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define DATA_PREP_TIMEOUT 100 6208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int prep_data_fs(void) 6218ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 6228ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int i; 6238ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 6248ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Do the prep of the /data filesystem */ 6258ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.post_fs_data_done", "0"); 6268ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.decrypt", "trigger_post_fs_data"); 6278ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("Just triggered post_fs_data\n"); 6288ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 6298ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Wait a max of 25 seconds, hopefully it takes much less */ 6308ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall for (i=0; i<DATA_PREP_TIMEOUT; i++) { 63129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char p[PROPERTY_VALUE_MAX]; 6328ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 6338ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("vold.post_fs_data_done", p, "0"); 6348ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (*p == '1') { 6358ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall break; 6368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 6378ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall usleep(250000); 6388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 6398ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 6408ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (i == DATA_PREP_TIMEOUT) { 6418ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Ugh, we failed to prep /data in time. Bail. */ 6428ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 6438ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 6448ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("post_fs_data done\n"); 6458ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return 0; 6468ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 6478ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 6488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 6496864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrallint cryptfs_restart(void) 6508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 6528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 6536864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 6548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 6558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 6568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct stat statbuf; 6578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1, i; 6580cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall static int restart_successful = 0; 6590cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 6600cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall /* Validate that it's OK to call this routine */ 66170a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks if (! master_key_saved) { 6620cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("Encrypted filesystem not validated, aborting"); 6630cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall return -1; 6640cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 6650cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 6660cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (restart_successful) { 6670cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("System already restarted with encrypted disk, aborting"); 6680cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall return -1; 6690cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 6708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Here is where we shut down the framework. The init scripts 6728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * start all services in one of three classes: core, main or late_start. 6738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * On boot, we start core and main. Now, we stop main, but not core, 6748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * as core includes vold and a few other really important things that 6758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * we need to keep running. Once main has stopped, we should be able 6768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to umount the tmpfs /data, then mount the encrypted /data. 6778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * We then restart the class main, and also the class late_start. 6788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * At the moment, I've only put a few things in late_start that I know 6798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * are not needed to bring up the framework, and that also cause problems 6808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * with unmounting the tmpfs /data, but I hope to add add more services 6818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to the late_start class as we optimize this to decrease the delay 6828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * till the user is asked for the password to the filesystem. 6838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main when vold.decrypt is 6868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * set to trigger_reset_main. 6878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_reset_main"); 6898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 6908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now that the framework is shutdown, we should be able to umount() 6928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the tmpfs filesystem, and mount the real one. 6938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6956864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); 6966864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall if (strlen(crypto_blkdev) == 0) { 6976864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall SLOGE("fs_crypto_blkdev not set\n"); 6986864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall return -1; 6996864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall } 7006864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall 701e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { 702e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall /* If that succeeded, then mount the decrypted filesystem */ 703e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_do_mount(get_fstab_filename(), DATA_MNT_POINT, crypto_blkdev, 0); 7048ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 705e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall property_set("vold.decrypt", "trigger_load_persist_props"); 706e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall /* Create necessary paths on /data */ 707e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall if (prep_data_fs()) { 708e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall return -1; 709e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall } 7108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 711e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall /* startup service classes main and late_start */ 712e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall property_set("vold.decrypt", "trigger_restart_framework"); 713e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall SLOGD("Just triggered restart_framework\n"); 7148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 715e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall /* Give it a few moments to get started */ 716e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall sleep(1); 7178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7190cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (rc == 0) { 7200cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall restart_successful = 1; 7210cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 7220cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 7238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 7248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7267f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrallstatic int do_crypto_complete(char *mount_point) 7277f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall{ 7287f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall struct crypt_mnt_ftr crypt_ftr; 7297f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall unsigned char encrypted_master_key[32]; 7307f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall unsigned char salt[SALT_LEN]; 7317f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall char real_blkdev[MAXPATHLEN]; 73229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char encrypted_state[PROPERTY_VALUE_MAX]; 733e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall char key_loc[PROPERTY_VALUE_MAX]; 7347f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 7357f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall property_get("ro.crypto.state", encrypted_state, ""); 7367f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall if (strcmp(encrypted_state, "encrypted") ) { 7377f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall SLOGE("not running with encryption, aborting"); 7387f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall return 1; 7397f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall } 7407f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 741e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev)); 7427f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 7437f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) { 744e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc)); 745e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall 746e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall /* 747e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall * Only report this error if key_loc is a file and it exists. 748e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall * If the device was never encrypted, and /data is not mountable for 749e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall * some reason, returning 1 should prevent the UI from presenting the 750e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall * a "enter password" screen, or worse, a "press button to wipe the 751e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall * device" screen. 752e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall */ 753e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) { 754e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall SLOGE("master key file does not exist, aborting"); 755e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall return 1; 756e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall } else { 757e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall SLOGE("Error getting crypt footer and key\n"); 758e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall return -1; 759e1a458578474954ea38456aacedbaf2ddfd37988Ken Sumrall } 7607f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall } 7617f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 7627f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS) { 7637f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall SLOGE("Encryption process didn't finish successfully\n"); 7647f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall return -2; /* -2 is the clue to the UI that there is no usable data on the disk, 7657f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall * and give the user an option to wipe the disk */ 7667f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall } 7677f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 7687f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall /* We passed the test! We shall diminish, and return to the west */ 7697f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall return 0; 7707f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall} 7717f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 77229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallstatic int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label) 7738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 7758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Allocate enough space for a 256 bit key, but we may use less */ 7768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 777e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char salt[SALT_LEN]; 7788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 7798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 7808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char tmp_mount_point[64]; 7818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int orig_failed_decrypt_count; 78229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char encrypted_state[PROPERTY_VALUE_MAX]; 7838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc; 7848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7850cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall property_get("ro.crypto.state", encrypted_state, ""); 78670a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { 7870cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("encrypted fs already validated or not running with encryption, aborting"); 7880cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall return -1; 7890cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 7900cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 791e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev)); 7928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 793e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) { 7948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error getting crypt footer and key\n"); 7958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 7968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 797d33d417e3a057fffad22c23f5f002177531db2a5Ken Sumrall 7988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size); 7998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count; 8008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { 802e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall decrypt_master_key(passwd, salt, encrypted_master_key, decrypted_master_key); 8038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, 80629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall real_blkdev, crypto_blkdev, label)) { 8078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating decrypted block device\n"); 8088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If init detects an encrypted filesystme, it writes a file for each such 8128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encrypted fs into the tmpfs /data filesystem, and then the framework finds those 8138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * files and passes that data to me */ 8148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Create a tmp mount point to try mounting the decryptd fs 8158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Since we're here, the mount_point should be a tmpfs filesystem, so make 8168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * a directory in it to test mount the decrypted filesystem. 8178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 8188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); 8198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall mkdir(tmp_mount_point, 0755); 820e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall if (fs_mgr_do_mount(get_fstab_filename(), DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) { 8218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error temp mounting decrypted block device\n"); 82229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall delete_crypto_blk_dev(label); 8238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count++; 8248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 8258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success, so just umount and we'll mount it properly when we restart 8268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the framework. 8278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 8288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall umount(tmp_mount_point); 8298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count = 0; 8308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) { 833e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0, 0); 8348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr.failed_decrypt_count) { 8378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We failed to mount the device, so return an error */ 8388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = crypt_ftr.failed_decrypt_count; 8398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 8416864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall /* Woot! Success! Save the name of the crypto block device 8426864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall * so we can mount it when restarting the framework. 8438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 8446864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); 84570a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks 84670a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks /* Also save a the master key so we can reencrypted the key 84770a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks * the key when we want to change the password on it. 8488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 84970a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES); 85029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall saved_data_blkdev = strdup(real_blkdev); 8513ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall saved_mount_point = strdup(mount_point); 85270a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks master_key_saved = 1; 8536864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall rc = 0; 8548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 8578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 8588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8590b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall/* Called by vold when it wants to undo the crypto mapping of a volume it 8600b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall * manages. This is usually in response to a factory reset, when we want 8610b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall * to undo the crypto mapping so the volume is formatted in the clear. 8620b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall */ 8630b8b59719357fb80c330442787f7d5b1e332263bKen Sumrallint cryptfs_revert_volume(const char *label) 8640b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall{ 8650b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall return delete_crypto_blk_dev((char *)label); 8660b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall} 8670b8b59719357fb80c330442787f7d5b1e332263bKen Sumrall 86829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall/* 86929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * Called by vold when it's asked to mount an encrypted, nonremovable volume. 87029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * Setup a dm-crypt mapping, use the saved master key from 87129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * setting up the /data mapping, and return the new device path. 87229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall */ 87329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallint cryptfs_setup_volume(const char *label, int major, int minor, 87429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char *crypto_sys_path, unsigned int max_path, 87529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall int *new_major, int *new_minor) 87629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall{ 87729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN]; 87829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall struct crypt_mnt_ftr sd_crypt_ftr; 87929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall unsigned char key[32], salt[32]; 88029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall struct stat statbuf; 88129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall int nr_sec, fd; 88229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 88329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor); 88429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 88529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Just want the footer, but gotta get it all */ 88629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall get_crypt_ftr_and_key(saved_data_blkdev, &sd_crypt_ftr, key, salt); 88729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 88829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Update the fs_size field to be the size of the volume */ 88929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fd = open(real_blkdev, O_RDONLY); 89029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall nr_sec = get_blkdev_size(fd); 89129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall close(fd); 89229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (nr_sec == 0) { 89329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot get size of volume %s\n", real_blkdev); 89429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1; 89529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 89629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 89729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall sd_crypt_ftr.fs_size = nr_sec; 89829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall create_crypto_blk_dev(&sd_crypt_ftr, saved_master_key, real_blkdev, 89929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall crypto_blkdev, label); 90029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 90129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall stat(crypto_blkdev, &statbuf); 90229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall *new_major = MAJOR(statbuf.st_rdev); 90329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall *new_minor = MINOR(statbuf.st_rdev); 90429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 90529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Create path to sys entry for this block device */ 90629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall snprintf(crypto_sys_path, max_path, "/devices/virtual/block/%s", strrchr(crypto_blkdev, '/')+1); 90729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 90829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return 0; 90929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall} 91029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 9117f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrallint cryptfs_crypto_complete(void) 9127f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall{ 9137f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall return do_crypto_complete("/data"); 9147f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall} 9157f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 9168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_check_passwd(char *passwd) 9178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 9188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 9198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 92029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall rc = test_mount_encrypted_fs(passwd, DATA_MNT_POINT, "userdata"); 9218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 9238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 9248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9253ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrallint cryptfs_verify_passwd(char *passwd) 9263ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall{ 9273ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall struct crypt_mnt_ftr crypt_ftr; 9283ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall /* Allocate enough space for a 256 bit key, but we may use less */ 9293ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 9303ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall unsigned char salt[SALT_LEN]; 9313ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall char real_blkdev[MAXPATHLEN]; 9323ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall char encrypted_state[PROPERTY_VALUE_MAX]; 9333ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall int rc; 9343ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9353ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall property_get("ro.crypto.state", encrypted_state, ""); 9363ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall if (strcmp(encrypted_state, "encrypted") ) { 9373ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall SLOGE("device not encrypted, aborting"); 9383ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall return -2; 9393ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } 9403ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9413ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall if (!master_key_saved) { 9423ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall SLOGE("encrypted fs not yet mounted, aborting"); 9433ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall return -1; 9443ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } 9453ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9463ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall if (!saved_mount_point) { 9473ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall SLOGE("encrypted fs failed to save mount point, aborting"); 9483ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall return -1; 9493ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } 9503ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 951e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev)); 9523ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9533ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) { 9543ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall SLOGE("Error getting crypt footer and key\n"); 9553ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall return -1; 9563ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } 9573ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9583ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall if (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) { 9593ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall /* If the device has no password, then just say the password is valid */ 9603ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall rc = 0; 9613ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } else { 9623ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall decrypt_master_key(passwd, salt, encrypted_master_key, decrypted_master_key); 9633ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) { 9643ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall /* They match, the password is correct */ 9653ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall rc = 0; 9663ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } else { 9673ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall /* If incorrect, sleep for a bit to prevent dictionary attacks */ 9683ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall sleep(1); 9693ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall rc = 1; 9703ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } 9713ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall } 9723ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9733ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall return rc; 9743ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall} 9753ad9072a5d6f6bda32123b367545649364e3c11dKen Sumrall 9768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Initialize a crypt_mnt_ftr structure. The keysize is 9778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * defaulted to 16 bytes, and the filesystem size to 0. 9788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Presumably, at a minimum, the caller will update the 9798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * filesystem size and crypto_type_name after calling this function. 9808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 9818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) 9828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 9838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->magic = CRYPT_MNT_MAGIC; 9848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->major_version = 1; 9858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->minor_version = 0; 9868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->ftr_size = sizeof(struct crypt_mnt_ftr); 9878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->flags = 0; 98870a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks ftr->keysize = KEY_LEN_BYTES; 9898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->spare1 = 0; 9908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->fs_size = 0; 9918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->failed_decrypt_count = 0; 9928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->crypto_type_name[0] = '\0'; 9938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 9948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 99529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallstatic int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type) 9968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 9978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char cmdline[256]; 9988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 9998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 100029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (type == EXT4_FS) { 100129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall snprintf(cmdline, sizeof(cmdline), "/system/bin/make_ext4fs -a /data -l %lld %s", 100229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall size * 512, crypto_blkdev); 100329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGI("Making empty filesystem with command %s\n", cmdline); 100429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else if (type== FAT_FS) { 100529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall snprintf(cmdline, sizeof(cmdline), "/system/bin/newfs_msdos -F 32 -O android -c 8 -s %lld %s", 100629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall size, crypto_blkdev); 100729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGI("Making empty filesystem with command %s\n", cmdline); 100829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else { 100929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("cryptfs_enable_wipe(): unknown filesystem type %d\n", type); 101029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return -1; 101129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 101229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 10138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (system(cmdline)) { 10148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating empty filesystem on %s\n", crypto_blkdev); 10158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 10168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Successfully created empty filesystem on %s\n", crypto_blkdev); 10178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 10188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 10218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 10228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_read(int fd, void* buff, int len) 10248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 10258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 10268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR); 10278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 10288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 10298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_write(int fd, const void* buff, int len) 10318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 10328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 10338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR); 10348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 10358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 10368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_INPLACE_BUFSIZE 4096 10388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) 103929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallstatic int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size, 104029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off64_t *size_already_done, off64_t tot_size) 10418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 10428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int realfd, cryptofd; 10438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *buf[CRYPT_INPLACE_BUFSIZE]; 10448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 10458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t numblocks, i, remainder; 10468ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall off64_t one_pct, cur_pct, new_pct; 104729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off64_t blocks_already_done, tot_numblocks; 10488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { 10508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); 10518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 10528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { 10558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 10568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 10578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 10588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* This is pretty much a simple loop of reading 4K, and writing 4K. 10618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * The size passed in is the number of 512 byte sectors in the filesystem. 10628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * So compute the number of whole 4K blocks we should read/write, 10638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * and the remainder. 10648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 10658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; 10668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall remainder = size % CRYPT_SECTORS_PER_BUFSIZE; 106729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; 106829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; 10698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Encrypting filesystem in place..."); 10718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 107229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall one_pct = tot_numblocks / 100; 10738ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cur_pct = 0; 10748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* process the majority of the filesystem in blocks */ 10758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<numblocks; i++) { 107629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall new_pct = (i + blocks_already_done) / one_pct; 10778ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (new_pct > cur_pct) { 10788ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char buf[8]; 10798ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10808ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cur_pct = new_pct; 10818ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall snprintf(buf, sizeof(buf), "%lld", cur_pct); 10828ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.encrypt_progress", buf); 10838ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 10848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 10858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); 10868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 10878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 10898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 10908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 10918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Do any remaining sectors */ 10958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<remainder; i++) { 10968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, 512) <= 0) { 10978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); 10988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 10998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 11008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, 512) <= 0) { 11018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 11028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 11038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 11048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 11058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 110629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall *size_already_done += size; 11078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 11088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 11098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 11108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 11118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(cryptofd); 11128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 11138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 11148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 11158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 11168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_WIPE 1 11178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_INPLACE 2 11188ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 11198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define FRAMEWORK_BOOT_WAIT 60 11208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 112129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrallstatic inline int should_encrypt(struct volume_info *volume) 112229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall{ 112329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall return (volume->flags & (VOL_ENCRYPTABLE | VOL_NONREMOVABLE)) == 112429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall (VOL_ENCRYPTABLE | VOL_NONREMOVABLE); 112529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall} 112629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 11278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_enable(char *howarg, char *passwd) 11288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 11298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int how = 0; 113029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN], sd_crypto_blkdev[MAXPATHLEN]; 1131e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall unsigned long nr_sec; 113270a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks unsigned char master_key[KEY_LEN_BYTES], decrypted_master_key[KEY_LEN_BYTES]; 1133e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char salt[SALT_LEN]; 1134319b1043bbbd410aa2d572d88b5936f26072d026Ken Sumrall int rc=-1, fd, i, ret; 113529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall struct crypt_mnt_ftr crypt_ftr, sd_crypt_ftr;; 113629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char tmpfs_options[PROPERTY_VALUE_MAX]; 113729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char encrypted_state[PROPERTY_VALUE_MAX]; 11385d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall char lockid[32] = { 0 }; 113929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char key_loc[PROPERTY_VALUE_MAX]; 114029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char fuse_sdcard[PROPERTY_VALUE_MAX]; 114129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char *sd_mnt_point; 114229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall char sd_blk_dev[256] = { 0 }; 114329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall int num_vols; 114429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall struct volume_info *vol_list = 0; 114529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall off64_t cur_encryption_done=0, tot_encryption_size=0; 11460cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 11470cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall property_get("ro.crypto.state", encrypted_state, ""); 11480cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (strcmp(encrypted_state, "unencrypted")) { 11490cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("Device is already running encrypted, aborting"); 11503ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 11510cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 11528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1153e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), key_loc, 0, sizeof(key_loc)); 115429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 11558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (!strcmp(howarg, "wipe")) { 11568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_WIPE; 11578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else if (! strcmp(howarg, "inplace")) { 11588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_INPLACE; 11598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 11608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Shouldn't happen, as CommandListener vets the args */ 11613ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 11628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 11638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1164e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev)); 11658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 11663ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* Get the size of the real block device */ 11673ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall fd = open(real_blkdev, O_RDONLY); 11683ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 11693ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blkdev); 11703ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 11713ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 11723ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall close(fd); 11733ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 11743ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* If doing inplace encryption, make sure the orig fs doesn't include the crypto footer */ 117529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ((how == CRYPTO_ENABLE_INPLACE) && (!strcmp(key_loc, KEY_IN_FOOTER))) { 11763ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall unsigned int fs_size_sec, max_fs_size_sec; 11773ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 11783ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall fs_size_sec = get_fs_size(real_blkdev); 11793ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall max_fs_size_sec = nr_sec - (CRYPT_FOOTER_OFFSET / 512); 11803ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 11813ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (fs_size_sec > max_fs_size_sec) { 11823ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Orig filesystem overlaps crypto footer region. Cannot encrypt in place."); 11833ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 11843ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 11853ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 11863ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 11875d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall /* Get a wakelock as this may take a while, and we don't want the 11885d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall * device to sleep on us. We'll grab a partial wakelock, and if the UI 11895d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall * wants to keep the screen on, it can grab a full wakelock. 11905d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall */ 119129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall snprintf(lockid, sizeof(lockid), "enablecrypto%d", (int) getpid()); 11925d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall acquire_wake_lock(PARTIAL_WAKE_LOCK, lockid); 11935d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall 11947382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey /* Get the sdcard mount point */ 11957382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey sd_mnt_point = getenv("MULTIUSER_EXTERNAL_STORAGE"); 11967382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey if (!sd_mnt_point) { 11977382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey sd_mnt_point = getenv("EXTERNAL_STORAGE"); 11987382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey } 11997382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey if (!sd_mnt_point) { 12007382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey sd_mnt_point = "/mnt/sdcard"; 12017382f81fba895f1ac970ac2fad875f35836b8082Jeff Sharkey } 120229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 120329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall num_vols=vold_getNumDirectVolumes(); 120429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list = malloc(sizeof(struct volume_info) * num_vols); 120529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vold_getDirectVolumeList(vol_list); 120629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 120729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall for (i=0; i<num_vols; i++) { 120829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (should_encrypt(&vol_list[i])) { 120929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall fd = open(vol_list[i].blk_dev, O_RDONLY); 121029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if ( (vol_list[i].size = get_blkdev_size(fd)) == 0) { 121129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Cannot get size of block device %s\n", vol_list[i].blk_dev); 121229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto error_unencrypted; 121329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 121429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall close(fd); 121529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 12163b17005083be230509480ea65ae67c237142fadaKen Sumrall ret=vold_disableVol(vol_list[i].label); 1217319b1043bbbd410aa2d572d88b5936f26072d026Ken Sumrall if ((ret < 0) && (ret != UNMOUNT_NOT_MOUNTED_ERR)) { 1218319b1043bbbd410aa2d572d88b5936f26072d026Ken Sumrall /* -2 is returned when the device exists but is not currently mounted. 1219319b1043bbbd410aa2d572d88b5936f26072d026Ken Sumrall * ignore the error and continue. */ 122029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall SLOGE("Failed to unmount volume %s\n", vol_list[i].label); 122129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto error_unencrypted; 122229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 122329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 122429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 122529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 12268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main and late start when 12278ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * vold sets trigger_shutdown_framework. 12288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 12298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_shutdown_framework"); 12308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 12318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1232425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall if (vold_unmountAllAsecs()) { 1233425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall /* Just report the error. If any are left mounted, 1234425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall * umounting /data below will fail and handle the error. 1235425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall */ 1236425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall SLOGE("Error unmounting internal asecs"); 1237425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall } 1238425524dba1552ab3d2ad39e205e65d0a2af997f2Ken Sumrall 123929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall property_get("ro.crypto.fuse_sdcard", fuse_sdcard, ""); 124029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!strcmp(fuse_sdcard, "true")) { 124129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* This is a device using the fuse layer to emulate the sdcard semantics 124229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * on top of the userdata partition. vold does not manage it, it is managed 124329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * by the sdcard service. The sdcard service was killed by the property trigger 124429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * above, so just unmount it now. We must do this _AFTER_ killing the framework, 124529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * unlike the case for vold managed devices above. 124629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall */ 124729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (wait_and_unmount(sd_mnt_point)) { 124829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall goto error_shutting_down; 124929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 12502eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall } 12518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 12528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now unmount the /data partition. */ 12538ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (wait_and_unmount(DATA_MNT_POINT)) { 12543ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 12558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 12568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 12578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Do extra work for a better UX when doing the long inplace encryption */ 12588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (how == CRYPTO_ENABLE_INPLACE) { 12598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Now that /data is unmounted, we need to mount a tmpfs 12608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * /data, set a property saying we're doing inplace encryption, 12618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * and restart the framework. 12628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 1263e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) { 12643ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 12658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 12668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Tells the framework that inplace encryption is starting */ 12677df84120b25dca713f623528801385b00208c2aaKen Sumrall property_set("vold.encrypt_progress", "0"); 12688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 12698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* restart the framework. */ 12708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Create necessary paths on /data */ 12718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (prep_data_fs()) { 12723ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 12738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 12748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 12758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* startup service classes main and late_start */ 12768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.decrypt", "trigger_restart_min_framework"); 12778ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("Just triggered restart_min_framework\n"); 12788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 12797df84120b25dca713f623528801385b00208c2aaKen Sumrall /* OK, the framework is restarted and will soon be showing a 12807df84120b25dca713f623528801385b00208c2aaKen Sumrall * progress bar. Time to setup an encrypted mapping, and 12817df84120b25dca713f623528801385b00208c2aaKen Sumrall * either write a new filesystem, or encrypt in place updating 12827df84120b25dca713f623528801385b00208c2aaKen Sumrall * the progress bar as we work. 12838ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 12848ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 12858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 12868ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Start the actual work of making an encrypted filesystem */ 12878ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Initialize a crypt_mnt_ftr for the partition */ 12888ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cryptfs_init_crypt_mnt_ftr(&crypt_ftr); 128929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!strcmp(key_loc, KEY_IN_FOOTER)) { 129029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512); 129129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } else { 129229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall crypt_ftr.fs_size = nr_sec; 129329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 1294d33d417e3a057fffad22c23f5f002177531db2a5Ken Sumrall crypt_ftr.flags |= CRYPT_ENCRYPTION_IN_PROGRESS; 12958ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); 12968ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 12978ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Make an encrypted master key */ 1298e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (create_encrypted_random_key(passwd, master_key, salt)) { 12998ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("Cannot create encrypted master key\n"); 13003ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 13018ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 13028ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 13038ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Write the key to the end of the partition */ 1304e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, master_key, salt); 13058ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 1306e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall decrypt_master_key(passwd, salt, master_key, decrypted_master_key); 130729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev, 130829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall "userdata"); 130929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 1310128626fc5aa3bf12d1ae5981c7f84f63625e8972Ken Sumrall /* The size of the userdata partition, and add in the vold volumes below */ 1311128626fc5aa3bf12d1ae5981c7f84f63625e8972Ken Sumrall tot_encryption_size = crypt_ftr.fs_size; 1312128626fc5aa3bf12d1ae5981c7f84f63625e8972Ken Sumrall 131329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* setup crypto mapping for all encryptable volumes handled by vold */ 131429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall for (i=0; i<num_vols; i++) { 131529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (should_encrypt(&vol_list[i])) { 131629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].crypt_ftr = crypt_ftr; /* gotta love struct assign */ 131729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].crypt_ftr.fs_size = vol_list[i].size; 131829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall create_crypto_blk_dev(&vol_list[i].crypt_ftr, decrypted_master_key, 131929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].blk_dev, vol_list[i].crypto_blkdev, 132029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].label); 1321128626fc5aa3bf12d1ae5981c7f84f63625e8972Ken Sumrall tot_encryption_size += vol_list[i].size; 132229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 132329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 13248ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 13258ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (how == CRYPTO_ENABLE_WIPE) { 132629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size, EXT4_FS); 132729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Encrypt all encryptable volumes handled by vold */ 132829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!rc) { 132929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall for (i=0; i<num_vols; i++) { 133029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (should_encrypt(&vol_list[i])) { 133129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall rc = cryptfs_enable_wipe(vol_list[i].crypto_blkdev, 133229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].crypt_ftr.fs_size, FAT_FS); 133329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 133429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 133529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 13368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else if (how == CRYPTO_ENABLE_INPLACE) { 133729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size, 133829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall &cur_encryption_done, tot_encryption_size); 133929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* Encrypt all encryptable volumes handled by vold */ 134029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!rc) { 134129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall for (i=0; i<num_vols; i++) { 134229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (should_encrypt(&vol_list[i])) { 134329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall rc = cryptfs_enable_inplace(vol_list[i].crypto_blkdev, 134429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].blk_dev, 134529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall vol_list[i].crypt_ftr.fs_size, 134629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall &cur_encryption_done, tot_encryption_size); 134729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 134829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 134929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 135029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (!rc) { 135129d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall /* The inplace routine never actually sets the progress to 100% 135229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall * due to the round down nature of integer division, so set it here */ 135329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall property_set("vold.encrypt_progress", "100"); 135429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 13558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 13568ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Shouldn't happen */ 13578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("cryptfs_enable: internal error, unknown option\n"); 13583ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 13598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 13608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 13618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Undo the dm-crypt mapping whether we succeed or not */ 136229d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall delete_crypto_blk_dev("userdata"); 136329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall for (i=0; i<num_vols; i++) { 136429d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall if (should_encrypt(&vol_list[i])) { 136529d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall delete_crypto_blk_dev(vol_list[i].label); 136629d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 136729d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall } 136829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall 136929d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall free(vol_list); 13708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 13718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! rc) { 13728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Success */ 13737f7dbaa2784c10fd2989fb303e5edfb8136d53dcKen Sumrall 1374d33d417e3a057fffad22c23f5f002177531db2a5Ken Sumrall /* Clear the encryption in progres flag in the footer */ 1375d33d417e3a057fffad22c23f5f002177531db2a5Ken Sumrall crypt_ftr.flags &= ~CRYPT_ENCRYPTION_IN_PROGRESS; 1376d33d417e3a057fffad22c23f5f002177531db2a5Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0, 0); 1377d33d417e3a057fffad22c23f5f002177531db2a5Ken Sumrall 137829d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall sleep(2); /* Give the UI a chance to show 100% progress */ 1379c290eaf6852c6318584926c5e39b27672638891fKen Sumrall android_reboot(ANDROID_RB_RESTART, 0, 0); 13803ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } else { 1381ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood char value[PROPERTY_VALUE_MAX]; 1382ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood 1383319369ac111aec79b42668477c998c36b5f3be06Ken Sumrall property_get("ro.vold.wipe_on_crypt_fail", value, "0"); 1384ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood if (!strcmp(value, "1")) { 1385ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood /* wipe data if encryption failed */ 1386ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood SLOGE("encryption failed - rebooting into recovery to wipe data\n"); 1387ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood mkdir("/cache/recovery", 0700); 13884684e58a8d1d502012c48295233e6663043cfb0bNick Kralevich int fd = open("/cache/recovery/command", O_RDWR|O_CREAT|O_TRUNC, 0600); 1389ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood if (fd >= 0) { 1390ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood write(fd, "--wipe_data", strlen("--wipe_data") + 1); 1391ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood close(fd); 1392ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood } else { 1393ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood SLOGE("could not open /cache/recovery/command\n"); 1394ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood } 1395ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood android_reboot(ANDROID_RB_RESTART2, 0, "recovery"); 1396ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood } else { 1397ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood /* set property to trigger dialog */ 1398ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood property_set("vold.encrypt_progress", "error_partially_encrypted"); 1399ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood release_wake_lock(lockid); 1400ee6d8c42f337ea1446a319df53f6d1a96afbd209Mike Lockwood } 14013ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return -1; 14028ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 14038ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 14043ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* hrm, the encrypt step claims success, but the reboot failed. 14053ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * This should not happen. 14063ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * Set the property and return. Hope the framework can deal with it. 14073ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall */ 14083ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_reboot_failed"); 14095d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall release_wake_lock(lockid); 14108ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return rc; 14113ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 14123ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrallerror_unencrypted: 141329d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall free(vol_list); 14143ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_not_encrypted"); 14155d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall if (lockid[0]) { 14165d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall release_wake_lock(lockid); 14175d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall } 14183ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return -1; 14193ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 14203ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrallerror_shutting_down: 14213ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* we failed, and have not encrypted anthing, so the users's data is still intact, 14223ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * but the framework is stopped and not restarted to show the error, so it's up to 14233ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * vold to restart the system. 14243ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall */ 14253ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Error enabling encryption after framework is shutdown, no data changed, restarting system"); 1426c290eaf6852c6318584926c5e39b27672638891fKen Sumrall android_reboot(ANDROID_RB_RESTART, 0, 0); 14273ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 14283ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* shouldn't get here */ 14293ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_shutting_down"); 143029d8da8cefa99e436c13295d4c9bad060ca18a6dKen Sumrall free(vol_list); 14315d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall if (lockid[0]) { 14325d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall release_wake_lock(lockid); 14335d4c68e40700424b65a4331be75620706a0dd49cKen Sumrall } 14343ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return -1; 14358ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 14368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 143770a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parksint cryptfs_changepw(char *newpw) 14388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 14398ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall struct crypt_mnt_ftr crypt_ftr; 144070a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks unsigned char encrypted_master_key[KEY_LEN_BYTES], decrypted_master_key[KEY_LEN_BYTES]; 1441e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char salt[SALT_LEN]; 14428ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char real_blkdev[MAXPATHLEN]; 14438ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 14448ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* This is only allowed after we've successfully decrypted the master key */ 144570a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks if (! master_key_saved) { 14460cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("Key not saved, aborting"); 14478ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 14488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 14498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 1450e5032c42da3c33a854df0a24a7968b4ab54190b9Ken Sumrall fs_mgr_get_crypt_info(get_fstab_filename(), 0, real_blkdev, sizeof(real_blkdev)); 14518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (strlen(real_blkdev) == 0) { 145257b63e61cb41e377708a4fdf18ecc80eb1b2b521Ken Sumrall SLOGE("Can't find real blkdev"); 14538ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 14548ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 14558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 14568ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* get key */ 1457e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) { 145857b63e61cb41e377708a4fdf18ecc80eb1b2b521Ken Sumrall SLOGE("Error getting crypt footer and key"); 14598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 14608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 14618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 146270a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks encrypt_master_key(newpw, salt, saved_master_key, encrypted_master_key); 14638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 146470a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks /* save the key */ 146570a4b3fd7a84a84bbe6e9d6d4ca3ee2098259fd9Jason parks put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt); 14668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 14678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 14688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 1469