cryptfs.c revision 8f869aa1bc685b505c58e97b4e11a9c7491a16f9
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> 368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <errno.h> 378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include <sys/reboot.h> 388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cryptfs.h" 398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define LOG_TAG "Cryptfs" 408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/log.h" 418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/properties.h" 428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define DM_CRYPT_BUF_SIZE 4096 448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallchar *me = "cryptfs"; 468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) 488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall memset(io, 0, dataSize); 508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_size = dataSize; 518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_start = sizeof(struct dm_ioctl); 528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[0] = 4; 538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[1] = 0; 548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[2] = 0; 558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->flags = flags; 568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (name) { 578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strncpy(io->name, name, sizeof(io->name)); 588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic unsigned int get_blkdev_size(int fd) 628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec; 648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { 668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nr_sec = 0; 678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return nr_sec; 708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* key can be NULL, in which case just write out the footer. Useful to 738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * update the failed mount count but not change the key. 748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int put_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *key) 778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (fd = open(real_blk_name, O_RDWR)) < 0) { 848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open real block device %s\n", real_blk_name); 858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blk_name); 908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encryption info footer and key, and plenty of bytes to spare for future 958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * growth. 968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 1008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to real block device footer\n"); 1018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 1058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write real block device footer\n"); 1068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (key) { 1108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->keysize != 16) { 1118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 1128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->keysize * 8, real_blk_name); 1138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 1178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write key for real block device %s\n", real_blk_name); 1188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 1238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 1248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 1268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 1278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 1288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 1308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 1328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *key) 1338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 1358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 1368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 1378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 1388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (fd = open(real_blk_name, O_RDWR)) < 0) { 1408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open real block device %s\n", real_blk_name); 1418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 1428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 1458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blk_name); 1468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 1508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encryption info footer and key, and plenty of bytes to spare for future 1518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * growth. 1528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#if 1 /* The real location, use when the enable code works */ 1548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 1558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#else 1568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* For testing, I'm slapping a handbuild header after my 200 megabyte 1578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * /data partition. So my offset if 200 megabytes */ 1588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = 200*1024*1024; 1598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#endif 1608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 1628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to real block device footer\n"); 1638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 1678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read real block device footer\n"); 1688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { 1728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Bad magic for real block device %s\n", real_blk_name); 1738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->major_version != 1) { 1778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot understand major version %d real block device footer\n", 1788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->major_version); 1798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->minor_version != 0) { 1838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n", 1848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->minor_version); 1858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->ftr_size > sizeof(struct crypt_mnt_ftr)) { 1888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* the footer size is bigger than we expected. 1898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Skip to it's stated end so we can read the key. 1908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr), SEEK_CUR) == -1) { 1928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to start of key\n"); 1938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->keysize != 16) { 1988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 1998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->keysize * 8, real_blk_name); 2008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 2048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read key for real block device %s\n", real_blk_name); 2058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 2098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 2108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 2128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 2138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 2148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Convert a binary key of specified length into an ascii hex string equivalent, 2178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * without the leading 0x and with null termination 2188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 2198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallvoid convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, 2208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *master_key_ascii) 2218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 2228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int i, a; 2238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char nibble; 2248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0, a=0; i<keysize; i++, a+=2) { 2268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* For each byte, write out two ascii hex digits */ 2278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = (master_key[i] >> 4) & 0xf; 2288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); 2298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = master_key[i] & 0xf; 2318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); 2328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Add the null termination */ 2358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = '\0'; 2368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, 2408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *real_blk_name, char *crypto_blk_name) 2418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 2428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 2438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ 2448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *crypt_params; 2458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 2468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_target_spec *tgt; 2478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int minor; 2488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 2498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 2508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *name ="datadev"; /* FIX ME: Make me a parameter */ 2518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 2538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 2548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 2588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 2608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_CREATE, io)) { 2618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot create dm-crypt device\n"); 2628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Get the device status, in particular, the name of it's device file */ 2668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 2678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_STATUS, io)) { 2688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot retrieve dm-crypt device status\n"); 2698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); 2728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); 2738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Load the mapping table for this device */ 2758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; 2768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 2788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->target_count = 1; 2798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->status = 0; 2808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->sector_start = 0; 2818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->length = crypt_ftr->fs_size; 2828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strcpy(tgt->target_type, "crypt"); 2838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); 2858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); 2868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(crypt_params, "%s %s 0 %s 0", crypt_ftr->crypto_type_name, 2878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii, real_blk_name); 2888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("crypt_params = %s\n", crypt_params); 2898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params += strlen(crypt_params) + 1; 2908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ 2918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->next = crypt_params - buffer; 2928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_TABLE_LOAD, io)) { 2948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot load dm-crypt mapping table.\n"); 2958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Resume this device to activate it */ 2998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 3008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_SUSPEND, io)) { 3028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot resume the dm-crypt device\n"); 3038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 3078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 3088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 3118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 3138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int delete_crypto_blk_dev(char *crypto_blkdev) 3168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 3188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 3198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 3208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *name ="datadev"; /* FIX ME: Make me a paraameter */ 3218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 3228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 3248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 3258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 3298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 3318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_REMOVE, io)) { 3328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot remove dm-crypt device\n"); 3338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 3378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 3388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 3418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 3438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* If we need to debug this, look at Devmapper.cpp:dumpState(), 3478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * It does DM_LIST_DEVICES, then iterates on each device and 3488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * calls DM_DEV_STATUS. 3498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 3508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define HASH_COUNT 2000 3528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define KEY_LEN_BYTES 16 3538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define IV_LEN_BYTES 16 3548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int create_encrypted_random_key(char *passwd, unsigned char *master_key) 3568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 3588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char buf[KEY_LEN_BYTES]; 3598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 3608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char salt[32] = { 0 }; 3618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX e_ctx; 3628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int encrypted_len, final_len; 3638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Get some random bits for a key */ 3658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall fd = open("/dev/urandom", O_RDONLY); 3668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall read(fd, buf, sizeof(buf)); 3678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 3688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now encrypt it with the password */ 3708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* To Do: Make a salt based on some immutable data about this device. 3718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * IMEI, or MEID, or CPU serial number, or whatever we can find 3728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 3738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 3748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, sizeof(salt), 3758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); 3768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 3788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 3798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptInit failed\n"); 3808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ 3838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Encrypt the master key */ 3848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_EncryptUpdate(&e_ctx, master_key, &encrypted_len, 3858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall buf, KEY_LEN_BYTES)) { 3868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptUpdate failed\n"); 3878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_EncryptFinal(&e_ctx, master_key + encrypted_len, &final_len)) { 3908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptFinal failed\n"); 3918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (encrypted_len + final_len != KEY_LEN_BYTES) { 3958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); 3968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 3978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 3988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 3998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int decrypt_master_key(char *passwd, unsigned char *encrypted_master_key, 4038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *decrypted_master_key) 4048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 4068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char salt[32] = { 0 }; 4078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX d_ctx; 4088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int decrypted_len, final_len; 4098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* To Do: Make a salt based on some immutable data about this device. 4118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * IMEI, or MEID, or CPU serial number, or whatever we can find 4128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 4138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 4148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, sizeof(salt), 4158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); 4168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 4188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 4198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ 4228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Decrypt the master key */ 4238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, 4248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall encrypted_master_key, KEY_LEN_BYTES)) { 4258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { 4288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (decrypted_len + final_len != KEY_LEN_BYTES) { 4328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 4358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_orig_mount_parms(char *mount_point, char *fs_type, char *real_blkdev, 4398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long *mnt_flags, char *fs_options) 4408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char mount_point2[32]; 4428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_flags[32]; 4438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_type", fs_type, ""); 4458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_real_blkdev", real_blkdev, ""); 4468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_mnt_point", mount_point2, ""); 4478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_options", fs_options, ""); 4488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_flags", fs_flags, ""); 4498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall *mnt_flags = strtol(fs_flags, 0, 0); 4508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (strcmp(mount_point, mount_point2)) { 4528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Consistency check. These should match. If not, something odd happened. */ 4538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 4578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int wait_and_unmount(char *mountpoint) 4608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int i, rc; 4628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define WAIT_UNMOUNT_COUNT 100 4638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now umount the tmpfs filesystem */ 4658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { 4668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (umount(mountpoint)) { 4678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 4688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall i++; 4698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall break; 4718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (i < WAIT_UNMOUNT_COUNT) { 4758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("unmounting %s succeeded\n", mountpoint); 4768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 4778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("unmounting %s failed\n", mountpoint); 4798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = -1; 4808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 4838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_restart(char *crypto_blkdev) 4868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 4888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 4898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 4908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 4918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct stat statbuf; 4928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1, i; 4938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define DATA_PREP_TIMEOUT 100 4948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Here is where we shut down the framework. The init scripts 4968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * start all services in one of three classes: core, main or late_start. 4978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * On boot, we start core and main. Now, we stop main, but not core, 4988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * as core includes vold and a few other really important things that 4998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * we need to keep running. Once main has stopped, we should be able 5008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to umount the tmpfs /data, then mount the encrypted /data. 5018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * We then restart the class main, and also the class late_start. 5028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * At the moment, I've only put a few things in late_start that I know 5038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * are not needed to bring up the framework, and that also cause problems 5048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * with unmounting the tmpfs /data, but I hope to add add more services 5058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to the late_start class as we optimize this to decrease the delay 5068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * till the user is asked for the password to the filesystem. 5078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 5088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main when vold.decrypt is 5108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * set to trigger_reset_main. 5118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 5128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_reset_main"); 5138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 5148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now that the framework is shutdown, we should be able to umount() 5168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the tmpfs filesystem, and mount the real one. 5178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 5188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! get_orig_mount_parms("/data", fs_type, real_blkdev, &mnt_flags, fs_options)) { 5208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just got orig mount parms\n"); 5218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! (rc = wait_and_unmount("/data")) ) { 5238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If that succeeded, then mount the decrypted filesystem */ 5248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall mount(crypto_blkdev, "/data", fs_type, mnt_flags, fs_options); 5258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Do the prep of the /data filesystem */ 5278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.post_fs_data_done", "0"); 5288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_post_fs_data"); 5298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just triggered post_fs_data\n"); 5308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Wait a max of 25 seconds, hopefully it takes much less */ 5328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<DATA_PREP_TIMEOUT; i++) { 5338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char p[16];; 5348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("vold.post_fs_data_done", p, "0"); 5368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (*p == '1') { 5378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall break; 5388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 5398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall usleep(250000); 5408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (i == DATA_PREP_TIMEOUT) { 5438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Ugh, we failed to prep /data in time. Bail. */ 5448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* startup service classes main and late_start */ 5488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_restart_framework"); 5498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just triggered restart_framework\n"); 5508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Give it a few moments to get started */ 5528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 5538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 5578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 5588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int test_mount_encrypted_fs(char *passwd, char *mount_point) 5608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 5628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Allocate enough space for a 256 bit key, but we may use less */ 5638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 5648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 5658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 5668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 5678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 5688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char tmp_mount_point[64]; 5698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 5708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int orig_failed_decrypt_count; 5718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc; 5728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options)) { 5748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading original mount parms for mount point %s\n", mount_point); 5758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key)) { 5798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error getting crypt footer and key\n"); 5808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size); 5838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count; 5848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { 5868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall decrypt_master_key(passwd, encrypted_master_key, decrypted_master_key); 5878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, 5908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall real_blkdev, crypto_blkdev)) { 5918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating decrypted block device\n"); 5928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If init detects an encrypted filesystme, it writes a file for each such 5968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encrypted fs into the tmpfs /data filesystem, and then the framework finds those 5978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * files and passes that data to me */ 5988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Create a tmp mount point to try mounting the decryptd fs 5998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Since we're here, the mount_point should be a tmpfs filesystem, so make 6008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * a directory in it to test mount the decrypted filesystem. 6018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); 6038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall mkdir(tmp_mount_point, 0755); 6048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( mount(crypto_blkdev, tmp_mount_point, "ext4", MS_RDONLY, "") ) { 6058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error temp mounting decrypted block device\n"); 6068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall delete_crypto_blk_dev(crypto_blkdev); 6078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count++; 6088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success, so just umount and we'll mount it properly when we restart 6108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the framework. 6118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall umount(tmp_mount_point); 6138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count = 0; 6148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) { 6178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0); 6188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr.failed_decrypt_count) { 6218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We failed to mount the device, so return an error */ 6228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = crypt_ftr.failed_decrypt_count; 6238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Woot! Success! Time to do the magic of unmounting the tmpfs 6268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * disk and mounting the encrypted one. 6278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = cryptfs_restart(crypto_blkdev); 6298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_check_passwd(char *passwd) 6358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 6378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = test_mount_encrypted_fs(passwd, "/data"); 6398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Initialize a crypt_mnt_ftr structure. The keysize is 6448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * defaulted to 16 bytes, and the filesystem size to 0. 6458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Presumably, at a minimum, the caller will update the 6468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * filesystem size and crypto_type_name after calling this function. 6478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) 6498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->magic = CRYPT_MNT_MAGIC; 6518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->major_version = 1; 6528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->minor_version = 0; 6538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->ftr_size = sizeof(struct crypt_mnt_ftr); 6548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->flags = 0; 6558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->keysize = 16; 6568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->spare1 = 0; 6578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->fs_size = 0; 6588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->failed_decrypt_count = 0; 6598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->crypto_type_name[0] = '\0'; 6608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size) 6638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char cmdline[256]; 6658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 6668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(cmdline, sizeof(cmdline), "/system/bin/make_ext4fs -a /data -l %lld %s", 6688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall size * 512, crypto_blkdev); 6698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGI("Making empty filesystem with command %s\n", cmdline); 6708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (system(cmdline)) { 6718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating empty filesystem on %s\n", crypto_blkdev); 6728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 6738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Successfully created empty filesystem on %s\n", crypto_blkdev); 6748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 6758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_read(int fd, void* buff, int len) 6818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 6838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR); 6848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 6858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_write(int fd, const void* buff, int len) 6888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 6908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR); 6918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 6928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_INPLACE_BUFSIZE 4096 6958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) 6968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size) 6978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int realfd, cryptofd; 6998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *buf[CRYPT_INPLACE_BUFSIZE]; 7008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 7018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t numblocks, i, remainder; 7028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { 7048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); 7058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 7068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { 7098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 7108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 7118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 7128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* This is pretty much a simple loop of reading 4K, and writing 4K. 7158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * The size passed in is the number of 512 byte sectors in the filesystem. 7168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * So compute the number of whole 4K blocks we should read/write, 7178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * and the remainder. 7188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; 7208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall remainder = size % CRYPT_SECTORS_PER_BUFSIZE; 7218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Encrypting filesystem in place..."); 7238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* process the majority of the filesystem in blocks */ 7258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<numblocks; i++) { 7268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( ! (i % 65536)) { //KEN 7278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("|"); //KEN 7288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } //KEN 7298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 7308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); 7318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 7348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 7358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Do any remaining sectors */ 7408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<remainder; i++) { 7418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, 512) <= 0) { 7428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); 7438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, 512) <= 0) { 7468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 7478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 7488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 7528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 7548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 7558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(cryptofd); 7568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 7588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_WIPE 1 7618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_INPLACE 2 7628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_enable(char *howarg, char *passwd) 7638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int how = 0; 7658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN]; 7668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32], fs_options[256], mount_point[32]; 7678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags, nr_sec; 7688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char master_key[16], decrypted_master_key[16]; 7698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc, fd; 7708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 7718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (!strcmp(howarg, "wipe")) { 7738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_WIPE; 7748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else if (! strcmp(howarg, "inplace")) { 7758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_INPLACE; 7768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 7778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Shouldn't happen, as CommandListener vets the args */ 7788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 7798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options); 7828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main and late start when 7848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * set to 4. They also unmount the fuse filesystem /mnt/sdcard on stingray. 7858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_shutdown_framework"); 7878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 7888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Temporary hack FIX ME!*/ 7908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(30); 7918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall umount("/mnt/sdcard"); 7928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now unmount the /data partition. */ 7948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! (rc = wait_and_unmount("/data")) ) { 7958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* OK, we've unmounted /data, time to setup an encrypted 7968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * mapping, and either write a new filesystem or encrypt 7978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * in place. 7988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall fd = open(real_blkdev, O_RDONLY); 8018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 8028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blkdev); 8038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 8068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize a crypt_mnt_ftr for the partition */ 8088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall cryptfs_init_crypt_mnt_ftr(&crypt_ftr); 8098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512); 8108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); 8118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Make an encrypted master key */ 8138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (create_encrypted_random_key(passwd, master_key)) { 8148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot create encrypted master key\n"); 8158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Write the key to the end of the partition */ 8198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, master_key); 8208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall decrypt_master_key(passwd, master_key, decrypted_master_key); 8228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev); 8238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (how == CRYPTO_ENABLE_WIPE) { 8258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size); 8268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else if (how == CRYPTO_ENABLE_INPLACE) { 8278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size); 8288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 8298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Shouldn't happen */ 8308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("cryptfs_enable: internal error, unknown option\n"); 8318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! rc) { 8358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall delete_crypto_blk_dev(crypto_blkdev); 8368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sync(); 8378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall reboot(LINUX_REBOOT_CMD_RESTART); 8388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 8408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 8448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 8458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 846