cryptfs.c revision 8ddbe40a8a8708dac7c472fa8c098c8f7b24534c
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> 388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/reboot.h> 398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cryptfs.h" 408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define LOG_TAG "Cryptfs" 418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/log.h" 428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/properties.h" 438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define DM_CRYPT_BUF_SIZE 4096 458ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define DATA_MNT_POINT "/data" 468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallchar *me = "cryptfs"; 488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic unsigned char saved_key_sha1[20] = { '\0' }; 508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int key_sha1_saved = 0; 518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) 538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall memset(io, 0, dataSize); 558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_size = dataSize; 568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_start = sizeof(struct dm_ioctl); 578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[0] = 4; 588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[1] = 0; 598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[2] = 0; 608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->flags = flags; 618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (name) { 628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strncpy(io->name, name, sizeof(io->name)); 638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic unsigned int get_blkdev_size(int fd) 678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec; 698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { 718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nr_sec = 0; 728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return nr_sec; 758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* key can be NULL, in which case just write out the footer. Useful to 788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * update the failed mount count but not change the key. 798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int put_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *key) 828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (fd = open(real_blk_name, O_RDWR)) < 0) { 898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open real block device %s\n", real_blk_name); 908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blk_name); 958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encryption info footer and key, and plenty of bytes to spare for future 1008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * growth. 1018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 1038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 1058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to real block device footer\n"); 1068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 1108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write real block device footer\n"); 1118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (key) { 1158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->keysize != 16) { 1168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 1178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->keysize * 8, real_blk_name); 1188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 1228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write key for real block device %s\n", real_blk_name); 1238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 1288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 1298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 1318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 1328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 1338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 1358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 1378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *key) 1388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 1408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 1418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 1428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 1438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (fd = open(real_blk_name, O_RDWR)) < 0) { 1458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open real block device %s\n", real_blk_name); 1468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 1478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 1508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blk_name); 1518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 1558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encryption info footer and key, and plenty of bytes to spare for future 1568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * growth. 1578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 1598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 1618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to real block device footer\n"); 1628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 1668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read real block device footer\n"); 1678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { 1718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Bad magic for real block device %s\n", real_blk_name); 1728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->major_version != 1) { 1768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot understand major version %d real block device footer\n", 1778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->major_version); 1788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->minor_version != 0) { 1828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n", 1838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->minor_version); 1848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->ftr_size > sizeof(struct crypt_mnt_ftr)) { 1878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* the footer size is bigger than we expected. 1888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Skip to it's stated end so we can read the key. 1898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr), SEEK_CUR) == -1) { 1918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to start of key\n"); 1928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->keysize != 16) { 1978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 1988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->keysize * 8, real_blk_name); 1998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 2038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read key for real block device %s\n", real_blk_name); 2048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 2088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 2098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 2118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 2128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 2138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Convert a binary key of specified length into an ascii hex string equivalent, 2168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * without the leading 0x and with null termination 2178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 2188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallvoid convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, 2198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *master_key_ascii) 2208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 2218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int i, a; 2228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char nibble; 2238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0, a=0; i<keysize; i++, a+=2) { 2258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* For each byte, write out two ascii hex digits */ 2268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = (master_key[i] >> 4) & 0xf; 2278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); 2288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = master_key[i] & 0xf; 2308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); 2318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Add the null termination */ 2348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = '\0'; 2358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, 2398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *real_blk_name, char *crypto_blk_name) 2408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 2418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 2428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ 2438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *crypt_params; 2448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 2458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_target_spec *tgt; 2468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int minor; 2478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 2488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 2498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *name ="datadev"; /* FIX ME: Make me a parameter */ 2508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 2528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 2538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 2578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 2598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_CREATE, io)) { 2608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot create dm-crypt device\n"); 2618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Get the device status, in particular, the name of it's device file */ 2658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 2668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_STATUS, io)) { 2678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot retrieve dm-crypt device status\n"); 2688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); 2718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); 2728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Load the mapping table for this device */ 2748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; 2758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 2778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->target_count = 1; 2788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->status = 0; 2798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->sector_start = 0; 2808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->length = crypt_ftr->fs_size; 2818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strcpy(tgt->target_type, "crypt"); 2828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); 2848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); 2858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(crypt_params, "%s %s 0 %s 0", crypt_ftr->crypto_type_name, 2868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii, real_blk_name); 2872eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall //SLOGD("crypt_params = %s\n", crypt_params); // Only for debugging, prints the master key! 2888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params += strlen(crypt_params) + 1; 2898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ 2908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->next = crypt_params - buffer; 2918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_TABLE_LOAD, io)) { 2938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot load dm-crypt mapping table.\n"); 2948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Resume this device to activate it */ 2988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 2998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_SUSPEND, io)) { 3018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot resume the dm-crypt device\n"); 3028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 3068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 3078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 3108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 3128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int delete_crypto_blk_dev(char *crypto_blkdev) 3158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 3178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 3188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 3198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *name ="datadev"; /* FIX ME: Make me a paraameter */ 3208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 3218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 3238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 3248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 3288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 3308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_REMOVE, io)) { 3318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot remove dm-crypt device\n"); 3328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 3368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 3378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 3408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 3428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define HASH_COUNT 2000 3468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define KEY_LEN_BYTES 16 3478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define IV_LEN_BYTES 16 3488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic void pbkdf2(char *passwd, unsigned char *ikey) 3508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char salt[32] = { 0 }; 3528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* To Do: Make a salt based on some immutable data about this device. 3548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * IMEI, or MEID, or CPU serial number, or whatever we can find 3558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 3568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 3578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, sizeof(salt), 3588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); 3598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 3608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 3618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int encrypt_master_key(char *passwd, unsigned char *decrypted_master_key, 3628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char *encrypted_master_key) 3638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 3648ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 3658ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall EVP_CIPHER_CTX e_ctx; 3668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int encrypted_len, final_len; 3678ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 3688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 3698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall pbkdf2(passwd, ikey); 3708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 3728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 3738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptInit failed\n"); 3748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ 3778ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 3788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Encrypt the master key */ 3798ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, 3808ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall decrypted_master_key, KEY_LEN_BYTES)) { 3818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptUpdate failed\n"); 3828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3848ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { 3858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptFinal failed\n"); 3868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (encrypted_len + final_len != KEY_LEN_BYTES) { 3908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); 3918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 3938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 3948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int decrypt_master_key(char *passwd, unsigned char *encrypted_master_key, 3988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *decrypted_master_key) 3998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 4018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX d_ctx; 4028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int decrypted_len, final_len; 4038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 4058ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall pbkdf2(passwd, ikey); 4068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 4088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 4098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ 4128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Decrypt the master key */ 4138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, 4148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall encrypted_master_key, KEY_LEN_BYTES)) { 4158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { 4188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (decrypted_len + final_len != KEY_LEN_BYTES) { 4228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 4258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4288ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int create_encrypted_random_key(char *passwd, unsigned char *master_key) 4298ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 4308ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int fd; 4318ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char buf[KEY_LEN_BYTES]; 4328ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 4338ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char salt[32] = { 0 }; 4348ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall EVP_CIPHER_CTX e_ctx; 4358ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int encrypted_len, final_len; 4368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4378ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Get some random bits for a key */ 4388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall fd = open("/dev/urandom", O_RDONLY); 4398ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall read(fd, buf, sizeof(buf)); 4408ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall close(fd); 4418ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4428ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Now encrypt it with the password */ 4438ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return encrypt_master_key(passwd, buf, master_key); 4448ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 4458ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_orig_mount_parms(char *mount_point, char *fs_type, char *real_blkdev, 4478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long *mnt_flags, char *fs_options) 4488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char mount_point2[32]; 4508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_flags[32]; 4518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_type", fs_type, ""); 4538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_real_blkdev", real_blkdev, ""); 4548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_mnt_point", mount_point2, ""); 4558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_options", fs_options, ""); 4568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_flags", fs_flags, ""); 4578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall *mnt_flags = strtol(fs_flags, 0, 0); 4588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (strcmp(mount_point, mount_point2)) { 4608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Consistency check. These should match. If not, something odd happened. */ 4618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 4658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int wait_and_unmount(char *mountpoint) 4688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int i, rc; 4702eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall#define WAIT_UNMOUNT_COUNT 20 4718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now umount the tmpfs filesystem */ 4738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { 4748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (umount(mountpoint)) { 4758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 4768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall i++; 4778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall break; 4798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (i < WAIT_UNMOUNT_COUNT) { 4838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("unmounting %s succeeded\n", mountpoint); 4848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 4858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("unmounting %s failed\n", mountpoint); 4878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = -1; 4888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 4918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4938ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define DATA_PREP_TIMEOUT 100 4948ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int prep_data_fs(void) 4958ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 4968ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int i; 4978ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4988ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Do the prep of the /data filesystem */ 4998ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.post_fs_data_done", "0"); 5008ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.decrypt", "trigger_post_fs_data"); 5018ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("Just triggered post_fs_data\n"); 5028ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5038ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Wait a max of 25 seconds, hopefully it takes much less */ 5048ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall for (i=0; i<DATA_PREP_TIMEOUT; i++) { 5058ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char p[16];; 5068ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5078ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("vold.post_fs_data_done", p, "0"); 5088ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (*p == '1') { 5098ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall break; 5108ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 5118ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall usleep(250000); 5128ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 5138ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 5148ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (i == DATA_PREP_TIMEOUT) { 5158ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Ugh, we failed to prep /data in time. Bail. */ 5168ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 5178ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 5188ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("post_fs_data done\n"); 5198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return 0; 5208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 5218ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 5228ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5236864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrallint cryptfs_restart(void) 5248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 5268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 5276864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 5288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 5298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 5308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct stat statbuf; 5318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1, i; 5328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Here is where we shut down the framework. The init scripts 5348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * start all services in one of three classes: core, main or late_start. 5358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * On boot, we start core and main. Now, we stop main, but not core, 5368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * as core includes vold and a few other really important things that 5378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * we need to keep running. Once main has stopped, we should be able 5388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to umount the tmpfs /data, then mount the encrypted /data. 5398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * We then restart the class main, and also the class late_start. 5408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * At the moment, I've only put a few things in late_start that I know 5418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * are not needed to bring up the framework, and that also cause problems 5428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * with unmounting the tmpfs /data, but I hope to add add more services 5438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to the late_start class as we optimize this to decrease the delay 5448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * till the user is asked for the password to the filesystem. 5458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 5468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main when vold.decrypt is 5488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * set to trigger_reset_main. 5498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 5508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_reset_main"); 5518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 5528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now that the framework is shutdown, we should be able to umount() 5548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the tmpfs filesystem, and mount the real one. 5558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 5568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5576864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); 5586864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall if (strlen(crypto_blkdev) == 0) { 5596864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall SLOGE("fs_crypto_blkdev not set\n"); 5606864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall return -1; 5616864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall } 5626864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall 5638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! get_orig_mount_parms(DATA_MNT_POINT, fs_type, real_blkdev, &mnt_flags, fs_options)) { 5648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just got orig mount parms\n"); 5658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { 5678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If that succeeded, then mount the decrypted filesystem */ 5688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall mount(crypto_blkdev, DATA_MNT_POINT, fs_type, mnt_flags, fs_options); 5698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Create necessary paths on /data */ 5718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (prep_data_fs()) { 5728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* startup service classes main and late_start */ 5768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_restart_framework"); 5778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just triggered restart_framework\n"); 5788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Give it a few moments to get started */ 5808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 5818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 5858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 5868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int test_mount_encrypted_fs(char *passwd, char *mount_point) 5888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 5908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Allocate enough space for a 256 bit key, but we may use less */ 5918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 5928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 5938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 5948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 5958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 5968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char tmp_mount_point[64]; 5978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 5988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int orig_failed_decrypt_count; 5998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc; 6008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options)) { 6028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading original mount parms for mount point %s\n", mount_point); 6038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key)) { 6078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error getting crypt footer and key\n"); 6088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size); 6118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count; 6128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { 6148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall decrypt_master_key(passwd, encrypted_master_key, decrypted_master_key); 6158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, 6188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall real_blkdev, crypto_blkdev)) { 6198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating decrypted block device\n"); 6208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If init detects an encrypted filesystme, it writes a file for each such 6248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encrypted fs into the tmpfs /data filesystem, and then the framework finds those 6258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * files and passes that data to me */ 6268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Create a tmp mount point to try mounting the decryptd fs 6278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Since we're here, the mount_point should be a tmpfs filesystem, so make 6288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * a directory in it to test mount the decrypted filesystem. 6298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); 6318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall mkdir(tmp_mount_point, 0755); 6328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( mount(crypto_blkdev, tmp_mount_point, "ext4", MS_RDONLY, "") ) { 6338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error temp mounting decrypted block device\n"); 6348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall delete_crypto_blk_dev(crypto_blkdev); 6358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count++; 6368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success, so just umount and we'll mount it properly when we restart 6388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the framework. 6398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall umount(tmp_mount_point); 6418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count = 0; 6428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) { 6458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0); 6468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr.failed_decrypt_count) { 6498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We failed to mount the device, so return an error */ 6508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = crypt_ftr.failed_decrypt_count; 6518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6536864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall /* Woot! Success! Save the name of the crypto block device 6546864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall * so we can mount it when restarting the framework. 6558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6566864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); 6578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Also save a SHA1 of the master key so we can know if we 6588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * successfully decrypted the key when we want to change the 6598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * password on it. 6608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 6618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SHA1(decrypted_master_key, KEY_LEN_BYTES, saved_key_sha1); 6628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall key_sha1_saved = 1; 6636864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall rc = 0; 6648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_check_passwd(char *passwd) 6708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 6728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6738ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall rc = test_mount_encrypted_fs(passwd, DATA_MNT_POINT); 6748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Initialize a crypt_mnt_ftr structure. The keysize is 6798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * defaulted to 16 bytes, and the filesystem size to 0. 6808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Presumably, at a minimum, the caller will update the 6818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * filesystem size and crypto_type_name after calling this function. 6828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) 6848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->magic = CRYPT_MNT_MAGIC; 6868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->major_version = 1; 6878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->minor_version = 0; 6888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->ftr_size = sizeof(struct crypt_mnt_ftr); 6898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->flags = 0; 6908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->keysize = 16; 6918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->spare1 = 0; 6928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->fs_size = 0; 6938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->failed_decrypt_count = 0; 6948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->crypto_type_name[0] = '\0'; 6958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size) 6988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char cmdline[256]; 7008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 7018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(cmdline, sizeof(cmdline), "/system/bin/make_ext4fs -a /data -l %lld %s", 7038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall size * 512, crypto_blkdev); 7048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGI("Making empty filesystem with command %s\n", cmdline); 7058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (system(cmdline)) { 7068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating empty filesystem on %s\n", crypto_blkdev); 7078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 7088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Successfully created empty filesystem on %s\n", crypto_blkdev); 7098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 7108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 7138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_read(int fd, void* buff, int len) 7168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 7188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR); 7198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 7208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_write(int fd, const void* buff, int len) 7238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 7258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR); 7268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 7278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_INPLACE_BUFSIZE 4096 7308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) 7318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size) 7328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int realfd, cryptofd; 7348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *buf[CRYPT_INPLACE_BUFSIZE]; 7358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 7368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t numblocks, i, remainder; 7378ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall off64_t one_pct, cur_pct, new_pct; 7388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 7398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { 7408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); 7418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 7428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { 7458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 7468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 7478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 7488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* This is pretty much a simple loop of reading 4K, and writing 4K. 7518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * The size passed in is the number of 512 byte sectors in the filesystem. 7528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * So compute the number of whole 4K blocks we should read/write, 7538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * and the remainder. 7548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; 7568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall remainder = size % CRYPT_SECTORS_PER_BUFSIZE; 7578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Encrypting filesystem in place..."); 7598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall one_pct = numblocks / 100; 7618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cur_pct = 0; 7628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* process the majority of the filesystem in blocks */ 7638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<numblocks; i++) { 7648ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall new_pct = i / one_pct; 7658ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (new_pct > cur_pct) { 7668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char buf[8]; 7678ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 7688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cur_pct = new_pct; 7698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall snprintf(buf, sizeof(buf), "%lld", cur_pct); 7708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.encrypt_progress", buf); 7718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 7728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 7738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); 7748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 7778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 7788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Do any remaining sectors */ 7838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<remainder; i++) { 7848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, 512) <= 0) { 7858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); 7868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, 512) <= 0) { 7898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 7908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7948ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.encrypt_progress", "100"); 7958ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 7968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 7978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 7998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 8008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(cryptofd); 8018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 8038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 8048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_WIPE 1 8068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_INPLACE 2 8078ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8088ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define FRAMEWORK_BOOT_WAIT 60 8098ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_enable(char *howarg, char *passwd) 8118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 8128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int how = 0; 8138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN]; 8148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32], fs_options[256], mount_point[32]; 8158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags, nr_sec; 8168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char master_key[16], decrypted_master_key[16]; 8178ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int rc=-1, fd, i; 8188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 8198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char tmpfs_options[80]; 8208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (!strcmp(howarg, "wipe")) { 8228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_WIPE; 8238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else if (! strcmp(howarg, "inplace")) { 8248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_INPLACE; 8258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 8268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Shouldn't happen, as CommandListener vets the args */ 8278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options); 8318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main and late start when 8338ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * vold sets trigger_shutdown_framework. 8348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 8358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_shutdown_framework"); 8368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 8378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8382eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall if (wait_and_unmount("/mnt/sdcard")) { 8392eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall return -1; 8402eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall } 8418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now unmount the /data partition. */ 8438ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (wait_and_unmount(DATA_MNT_POINT)) { 8448ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 8458ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 8468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8478ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Do extra work for a better UX when doing the long inplace encryption */ 8488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (how == CRYPTO_ENABLE_INPLACE) { 8498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Now that /data is unmounted, we need to mount a tmpfs 8508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * /data, set a property saying we're doing inplace encryption, 8518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * and restart the framework. 8528ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 8538ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("ro.crypto.tmpfs_options", tmpfs_options, ""); 8548ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (mount("tmpfs", DATA_MNT_POINT, "tmpfs", MS_NOATIME | MS_NOSUID | MS_NODEV, 8558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall tmpfs_options) < 0) { 8568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Tells the framework that inplace encryption is starting */ 8598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.encrypt_progress", "startup"); 8608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* restart the framework. */ 8628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Create necessary paths on /data */ 8638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (prep_data_fs()) { 8648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8678ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* startup service classes main and late_start */ 8688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.decrypt", "trigger_restart_min_framework"); 8698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("Just triggered restart_min_framework\n"); 8708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Wait till the framework is ready */ 8728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall for (i=0; i<FRAMEWORK_BOOT_WAIT; i++) { 8738ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char progress_state[32]; 8748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall sleep(1); 8768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("vold.encrypt_progress", progress_state, ""); 8778ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! strcmp(progress_state, "ready")) { 8788ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall break; 8798ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 8808ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 8818ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (i == FRAMEWORK_BOOT_WAIT) { 8828ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* The framework never rebooted, so abort */ 8838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8858ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* OK, the framework is restarted and displaying a progress bar, 8868ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * time to setup an encrypted mapping, and either write a new 8878ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * filesystem or encrypt in place, updating the progress bar 8888ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * as we work. 8898ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 8908ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 8918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8928ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Start the actual work of making an encrypted filesystem */ 8938ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall fd = open(real_blkdev, O_RDONLY); 8948ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 8958ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("Cannot get size of block device %s\n", real_blkdev); 8968ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 8978ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 8988ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall close(fd); 8998ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9008ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Initialize a crypt_mnt_ftr for the partition */ 9018ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cryptfs_init_crypt_mnt_ftr(&crypt_ftr); 9028ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512); 9038ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); 9048ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9058ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Make an encrypted master key */ 9068ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (create_encrypted_random_key(passwd, master_key)) { 9078ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("Cannot create encrypted master key\n"); 9088ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 9098ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9108ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9118ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Write the key to the end of the partition */ 9128ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, master_key); 9138ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9148ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall decrypt_master_key(passwd, master_key, decrypted_master_key); 9158ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev); 9168ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9178ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (how == CRYPTO_ENABLE_WIPE) { 9188ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size); 9198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else if (how == CRYPTO_ENABLE_INPLACE) { 9208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size); 9218ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 9228ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Shouldn't happen */ 9238ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("cryptfs_enable: internal error, unknown option\n"); 9248ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 9258ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9268ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9278ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Undo the dm-crypt mapping whether we succeed or not */ 9288ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall delete_crypto_blk_dev(crypto_blkdev); 9298ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9308ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! rc) { 9318ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Success */ 9328ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall sleep(2); /* Give the UI a change to show 100% progress */ 9338ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall sync(); 9348ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall reboot(LINUX_REBOOT_CMD_RESTART); 9358ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9378ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Only returns on error */ 9388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return rc; 9398ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 9408ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9418ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallint cryptfs_changepw(char *oldpw, char *newpw) 9428ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 9438ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall struct crypt_mnt_ftr crypt_ftr; 9448ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 9458ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char new_key_sha1[20]; 9468ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char real_blkdev[MAXPATHLEN]; 9478ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* This is only allowed after we've successfully decrypted the master key */ 9498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! key_sha1_saved) { 9508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 9518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9528ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9538ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("ro.crypto.fs_real_blkdev", real_blkdev, ""); 9548ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (strlen(real_blkdev) == 0) { 9558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 9568ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* get key */ 9598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key)) { 9608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("Error getting crypt footer and key\n"); 9618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 9628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9648ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* decrypt key with old passwd */ 9658ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall decrypt_master_key(oldpw, encrypted_master_key, decrypted_master_key); 9668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9678ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* compute sha1 of decrypted key */ 9688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SHA1(decrypted_master_key, KEY_LEN_BYTES, new_key_sha1); 9698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* If computed sha1 and saved sha1 match, encrypt key with new passwd */ 9718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! memcmp(saved_key_sha1, new_key_sha1, sizeof(saved_key_sha1))) { 9728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* they match, it's safe to re-encrypt the key */ 9738ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall encrypt_master_key(newpw, decrypted_master_key, encrypted_master_key); 9748ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* save the key */ 9768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key); 9778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 9788ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("SHA1 mismatch"); 9798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 9808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 9818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 9838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 9848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 985