cryptfs.c revision 3ed8236de11a1be8b45d4c37b2208682f5e97c72
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> 393ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall#include <ext4.h> 408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cryptfs.h" 418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define LOG_TAG "Cryptfs" 428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/log.h" 438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#include "cutils/properties.h" 448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define DM_CRYPT_BUF_SIZE 4096 468ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define DATA_MNT_POINT "/data" 478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallchar *me = "cryptfs"; 498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic unsigned char saved_key_sha1[20] = { '\0' }; 518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int key_sha1_saved = 0; 528ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) 548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall memset(io, 0, dataSize); 568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_size = dataSize; 578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->data_start = sizeof(struct dm_ioctl); 588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[0] = 4; 598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[1] = 0; 608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->version[2] = 0; 618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->flags = flags; 628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (name) { 638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strncpy(io->name, name, sizeof(io->name)); 648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 673ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrallstatic unsigned int get_fs_size(char *dev) 683ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall{ 693ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall int fd, block_size; 703ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall struct ext4_super_block sb; 713ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall off64_t len; 723ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 733ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if ((fd = open(dev, O_RDONLY)) < 0) { 743ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot open device to get filesystem size "); 753ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return 0; 763ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 773ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 783ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (lseek64(fd, 1024, SEEK_SET) < 0) { 793ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot seek to superblock"); 803ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return 0; 813ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 823ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 833ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { 843ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot read superblock"); 853ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return 0; 863ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 873ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 883ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall close(fd); 893ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 903ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall block_size = 1024 << sb.s_log_block_size; 913ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* compute length in bytes */ 923ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; 933ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 943ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* return length in sectors */ 953ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return (unsigned int) (len / 512); 963ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall} 973ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic unsigned int get_blkdev_size(int fd) 998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec; 1018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { 1038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nr_sec = 0; 1048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return nr_sec; 1078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 1088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 109e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall/* key or salt can be NULL, in which case just skip writing that value. Useful to 1108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * update the failed mount count but not change the key. 1118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int put_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 113e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *key, unsigned char *salt) 1148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 1168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 1178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 1188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 1198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (fd = open(real_blk_name, O_RDWR)) < 0) { 1218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open real block device %s\n", real_blk_name); 1228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 1238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 1268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blk_name); 1278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 1318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encryption info footer and key, and plenty of bytes to spare for future 1328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * growth. 1338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 1348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 1358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 1378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to real block device footer\n"); 1388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 1428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write real block device footer\n"); 1438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (key) { 1478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->keysize != 16) { 1488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 1498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->keysize * 8, real_blk_name); 1508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 1548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot write key for real block device %s\n", real_blk_name); 1558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 1568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 159e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (salt) { 160e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall /* Compute the offset for start of the crypt footer */ 161e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 162e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall /* Add in the length of the footer, key and padding */ 163e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall off += sizeof(struct crypt_mnt_ftr) + crypt_ftr->keysize + KEY_TO_SALT_PADDING; 164e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 165e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 166e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall SLOGE("Cannot seek to real block device salt \n"); 167e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 168e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 169e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 170e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if ( (cnt = write(fd, salt, SALT_LEN)) != SALT_LEN) { 171e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall SLOGE("Cannot write salt for real block device %s\n", real_blk_name); 172e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 173e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 174e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 175e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 1768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 1778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 1788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 1808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 1818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 1828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 1848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr, 186e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *key, unsigned char *salt) 1878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 1888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 1898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int nr_sec, cnt; 1908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t off; 1918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 1928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (fd = open(real_blk_name, O_RDWR)) < 0) { 1948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open real block device %s\n", real_blk_name); 1958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 1968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 1978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 1998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blk_name); 2008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If it's an encrypted Android partition, the last 16 Kbytes contain the 2048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encryption info footer and key, and plenty of bytes to spare for future 2058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * growth. 2068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 2078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; 2088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek64(fd, off, SEEK_SET) == -1) { 2108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to real block device footer\n"); 2118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { 2158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read real block device footer\n"); 2168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { 2208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Bad magic for real block device %s\n", real_blk_name); 2218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->major_version != 1) { 2258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot understand major version %d real block device footer\n", 2268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->major_version); 2278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->minor_version != 0) { 2318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n", 2328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->minor_version); 2338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->ftr_size > sizeof(struct crypt_mnt_ftr)) { 2368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* the footer size is bigger than we expected. 2378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Skip to it's stated end so we can read the key. 2388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 2398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr), SEEK_CUR) == -1) { 2408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot seek to start of key\n"); 2418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr->keysize != 16) { 2468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Keysize of %d bits not supported for real block device %s\n", 2478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr->keysize * 8, real_blk_name); 2488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) { 2528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot read key for real block device %s\n", real_blk_name); 2538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 2548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 256e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (lseek64(fd, KEY_TO_SALT_PADDING, SEEK_CUR) == -1) { 257e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall SLOGE("Cannot seek to real block device salt\n"); 258e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 259e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 260e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 261e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if ( (cnt = read(fd, salt, SALT_LEN)) != SALT_LEN) { 262e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall SLOGE("Cannot read salt for real block device %s\n", real_blk_name); 263e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall goto errout; 264e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall } 265e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall 2668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success! */ 2678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 2688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 2708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); 2718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 2728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Convert a binary key of specified length into an ascii hex string equivalent, 2758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * without the leading 0x and with null termination 2768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 2778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallvoid convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, 2788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *master_key_ascii) 2798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 2808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int i, a; 2818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char nibble; 2828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0, a=0; i<keysize; i++, a+=2) { 2848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* For each byte, write out two ascii hex digits */ 2858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = (master_key[i] >> 4) & 0xf; 2868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); 2878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall nibble = master_key[i] & 0xf; 2898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); 2908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 2918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Add the null termination */ 2938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii[a] = '\0'; 2948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 2968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 2978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, 2988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *real_blk_name, char *crypto_blk_name) 2998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 3018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ 3028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *crypt_params; 3038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 3048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_target_spec *tgt; 3058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int minor; 3068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 3078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 3088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *name ="datadev"; /* FIX ME: Make me a parameter */ 3098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 3118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 3128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 3168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 3188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_CREATE, io)) { 3198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot create dm-crypt device\n"); 3208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Get the device status, in particular, the name of it's device file */ 3248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 3258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_STATUS, io)) { 3268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot retrieve dm-crypt device status\n"); 3278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); 3308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); 3318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Load the mapping table for this device */ 3338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; 3348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 3368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io->target_count = 1; 3378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->status = 0; 3388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->sector_start = 0; 3398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->length = crypt_ftr->fs_size; 3408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall strcpy(tgt->target_type, "crypt"); 3418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); 3438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); 3448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(crypt_params, "%s %s 0 %s 0", crypt_ftr->crypto_type_name, 3458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall master_key_ascii, real_blk_name); 3468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params += strlen(crypt_params) + 1; 3478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ 3488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall tgt->next = crypt_params - buffer; 3498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_TABLE_LOAD, io)) { 3518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot load dm-crypt mapping table.\n"); 3528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Resume this device to activate it */ 3568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, 4096, name, 0); 3578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_SUSPEND, io)) { 3598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot resume the dm-crypt device\n"); 3608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 3648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 3658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 3688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 3708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 3718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int delete_crypto_blk_dev(char *crypto_blkdev) 3738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 3748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int fd; 3758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char buffer[DM_CRYPT_BUF_SIZE]; 3768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct dm_ioctl *io; 3778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *name ="datadev"; /* FIX ME: Make me a paraameter */ 3788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int retval = -1; 3798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { 3818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot open device-mapper\n"); 3828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall io = (struct dm_ioctl *) buffer; 3868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); 3888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (ioctl(fd, DM_DEV_REMOVE, io)) { 3898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Cannot remove dm-crypt device\n"); 3908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 3918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 3928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We made it here with no errors. Woot! */ 3948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall retval = 0; 3958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 3978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ 3988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 3998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return retval; 4008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define HASH_COUNT 2000 4048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define KEY_LEN_BYTES 16 4058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define IV_LEN_BYTES 16 4068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 407e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey) 4088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 410e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, SALT_LEN, 4118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); 4128ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 4138ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 414e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic int encrypt_master_key(char *passwd, unsigned char *salt, 415e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *decrypted_master_key, 4168ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char *encrypted_master_key) 4178ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 4188ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 4198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall EVP_CIPHER_CTX e_ctx; 4208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int encrypted_len, final_len; 4218ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4228ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 423e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall pbkdf2(passwd, salt, ikey); 4248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 4268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 4278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptInit failed\n"); 4288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ 4318ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Encrypt the master key */ 4338ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, 4348ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall decrypted_master_key, KEY_LEN_BYTES)) { 4358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptUpdate failed\n"); 4368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { 4398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_EncryptFinal failed\n"); 4408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (encrypted_len + final_len != KEY_LEN_BYTES) { 4448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); 4458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 4488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 451e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic int decrypt_master_key(char *passwd, unsigned char *salt, 452e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char *encrypted_master_key, 4538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char *decrypted_master_key) 4548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 4558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ 4568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX d_ctx; 4578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int decrypted_len, final_len; 4588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Turn the password into a key and IV that can decrypt the master key */ 460e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall pbkdf2(passwd, salt, ikey); 4618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Initialize the decryption engine */ 4638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { 4648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ 4678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Decrypt the master key */ 4688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, 4698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall encrypted_master_key, KEY_LEN_BYTES)) { 4708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { 4738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 4768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (decrypted_len + final_len != KEY_LEN_BYTES) { 4778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 4788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 4798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 4808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 4818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 4828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 483e87440703663f5ee326326f6438f3b00ea315623Ken Sumrallstatic int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt) 4848ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 4858ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int fd; 486e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char key_buf[KEY_LEN_BYTES]; 4878ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall EVP_CIPHER_CTX e_ctx; 4888ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int encrypted_len, final_len; 4898ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4908ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Get some random bits for a key */ 4918ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall fd = open("/dev/urandom", O_RDONLY); 492e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall read(fd, key_buf, sizeof(key_buf)); 493e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall read(fd, salt, SALT_LEN); 4948ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall close(fd); 4958ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 4968ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Now encrypt it with the password */ 497e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall return encrypt_master_key(passwd, salt, key_buf, master_key); 4988ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 4998ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int get_orig_mount_parms(char *mount_point, char *fs_type, char *real_blkdev, 5018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long *mnt_flags, char *fs_options) 5028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char mount_point2[32]; 5048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_flags[32]; 5058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_type", fs_type, ""); 5078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_real_blkdev", real_blkdev, ""); 5088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_mnt_point", mount_point2, ""); 5098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_options", fs_options, ""); 5108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_get("ro.crypto.fs_flags", fs_flags, ""); 5118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall *mnt_flags = strtol(fs_flags, 0, 0); 5128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (strcmp(mount_point, mount_point2)) { 5148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Consistency check. These should match. If not, something odd happened. */ 5158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 5168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 5198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 5208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int wait_and_unmount(char *mountpoint) 5228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int i, rc; 5242eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall#define WAIT_UNMOUNT_COUNT 20 5258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now umount the tmpfs filesystem */ 5278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { 5288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (umount(mountpoint)) { 5298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 5308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall i++; 5318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 5328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall break; 5338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (i < WAIT_UNMOUNT_COUNT) { 5378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("unmounting %s succeeded\n", mountpoint); 5388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 5398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 5408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("unmounting %s failed\n", mountpoint); 5418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = -1; 5428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 5438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 5458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 5468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5478ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define DATA_PREP_TIMEOUT 100 5488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallstatic int prep_data_fs(void) 5498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 5508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int i; 5518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5528ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Do the prep of the /data filesystem */ 5538ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.post_fs_data_done", "0"); 5548ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.decrypt", "trigger_post_fs_data"); 5558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("Just triggered post_fs_data\n"); 5568ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Wait a max of 25 seconds, hopefully it takes much less */ 5588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall for (i=0; i<DATA_PREP_TIMEOUT; i++) { 5598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char p[16];; 5608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("vold.post_fs_data_done", p, "0"); 5628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (*p == '1') { 5638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall break; 5648ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 5658ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall usleep(250000); 5668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 5678ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 5688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (i == DATA_PREP_TIMEOUT) { 5698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Ugh, we failed to prep /data in time. Bail. */ 5708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 5718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 5728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("post_fs_data done\n"); 5738ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return 0; 5748ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 5758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 5768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 5776864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrallint cryptfs_restart(void) 5788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 5798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 5808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 5816864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 5828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 5838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 5848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct stat statbuf; 5858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1, i; 5860cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall static int restart_successful = 0; 5870cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 5880cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall /* Validate that it's OK to call this routine */ 5890cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (! key_sha1_saved) { 5900cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("Encrypted filesystem not validated, aborting"); 5910cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall return -1; 5920cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 5930cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 5940cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (restart_successful) { 5950cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("System already restarted with encrypted disk, aborting"); 5960cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall return -1; 5970cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 5988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 5998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Here is where we shut down the framework. The init scripts 6008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * start all services in one of three classes: core, main or late_start. 6018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * On boot, we start core and main. Now, we stop main, but not core, 6028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * as core includes vold and a few other really important things that 6038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * we need to keep running. Once main has stopped, we should be able 6048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to umount the tmpfs /data, then mount the encrypted /data. 6058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * We then restart the class main, and also the class late_start. 6068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * At the moment, I've only put a few things in late_start that I know 6078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * are not needed to bring up the framework, and that also cause problems 6088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * with unmounting the tmpfs /data, but I hope to add add more services 6098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * to the late_start class as we optimize this to decrease the delay 6108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * till the user is asked for the password to the filesystem. 6118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main when vold.decrypt is 6148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * set to trigger_reset_main. 6158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_reset_main"); 6178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 6188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now that the framework is shutdown, we should be able to umount() 6208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the tmpfs filesystem, and mount the real one. 6218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 6228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6236864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); 6246864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall if (strlen(crypto_blkdev) == 0) { 6256864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall SLOGE("fs_crypto_blkdev not set\n"); 6266864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall return -1; 6276864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall } 6286864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall 6298ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! get_orig_mount_parms(DATA_MNT_POINT, fs_type, real_blkdev, &mnt_flags, fs_options)) { 6308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just got orig mount parms\n"); 6318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6328ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { 6338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If that succeeded, then mount the decrypted filesystem */ 6348ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall mount(crypto_blkdev, DATA_MNT_POINT, fs_type, mnt_flags, fs_options); 6358ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 6368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Create necessary paths on /data */ 6378ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (prep_data_fs()) { 6388f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* startup service classes main and late_start */ 6428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_restart_framework"); 6438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just triggered restart_framework\n"); 6448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Give it a few moments to get started */ 6468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sleep(1); 6478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6500cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (rc == 0) { 6510cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall restart_successful = 1; 6520cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 6530cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 6548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 6558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 6568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int test_mount_encrypted_fs(char *passwd, char *mount_point) 6588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 6598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 6608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Allocate enough space for a 256 bit key, but we may use less */ 6618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 662e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char salt[SALT_LEN]; 6638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN]; 6648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char real_blkdev[MAXPATHLEN]; 6658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32]; 6668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_options[256]; 6678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char tmp_mount_point[64]; 6688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags; 6698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned int orig_failed_decrypt_count; 6700cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall char encrypted_state[32]; 6718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc; 6728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6730cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall property_get("ro.crypto.state", encrypted_state, ""); 6740cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if ( key_sha1_saved || strcmp(encrypted_state, "encrypted") ) { 6750cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("encrypted fs already validated or not running with encryption, aborting"); 6760cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall return -1; 6770cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 6780cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 6798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options)) { 6808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading original mount parms for mount point %s\n", mount_point); 6818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 684e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) { 6858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error getting crypt footer and key\n"); 6868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size); 6898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count; 6908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { 692e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall decrypt_master_key(passwd, salt, encrypted_master_key, decrypted_master_key); 6938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 6948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 6958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, 6968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall real_blkdev, crypto_blkdev)) { 6978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating decrypted block device\n"); 6988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 6998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* If init detects an encrypted filesystme, it writes a file for each such 7028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * encrypted fs into the tmpfs /data filesystem, and then the framework finds those 7038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * files and passes that data to me */ 7048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Create a tmp mount point to try mounting the decryptd fs 7058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Since we're here, the mount_point should be a tmpfs filesystem, so make 7068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * a directory in it to test mount the decrypted filesystem. 7078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); 7098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall mkdir(tmp_mount_point, 0755); 7108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( mount(crypto_blkdev, tmp_mount_point, "ext4", MS_RDONLY, "") ) { 7118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error temp mounting decrypted block device\n"); 7128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall delete_crypto_blk_dev(crypto_blkdev); 7138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count++; 7148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 7158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Success, so just umount and we'll mount it properly when we restart 7168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * the framework. 7178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall umount(tmp_mount_point); 7198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall crypt_ftr.failed_decrypt_count = 0; 7208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) { 723e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0, 0); 7248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (crypt_ftr.failed_decrypt_count) { 7278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* We failed to mount the device, so return an error */ 7288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = crypt_ftr.failed_decrypt_count; 7298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 7316864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall /* Woot! Success! Save the name of the crypto block device 7326864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall * so we can mount it when restarting the framework. 7338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7346864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); 7358ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Also save a SHA1 of the master key so we can know if we 7368ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * successfully decrypted the key when we want to change the 7378ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * password on it. 7388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 7398ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SHA1(decrypted_master_key, KEY_LEN_BYTES, saved_key_sha1); 7408ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall key_sha1_saved = 1; 7416864b7ec94a57b73c300457955d86dc604aeddf5Ken Sumrall rc = 0; 7428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 7458f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7468f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7478f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_check_passwd(char *passwd) 7488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 7508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall rc = test_mount_encrypted_fs(passwd, DATA_MNT_POINT); 7528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 7548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall/* Initialize a crypt_mnt_ftr structure. The keysize is 7578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * defaulted to 16 bytes, and the filesystem size to 0. 7588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * Presumably, at a minimum, the caller will update the 7598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * filesystem size and crypto_type_name after calling this function. 7608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 7618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) 7628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->magic = CRYPT_MNT_MAGIC; 7648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->major_version = 1; 7658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->minor_version = 0; 7668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->ftr_size = sizeof(struct crypt_mnt_ftr); 7678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->flags = 0; 7688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->keysize = 16; 7698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->spare1 = 0; 7708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->fs_size = 0; 7718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->failed_decrypt_count = 0; 7728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall ftr->crypto_type_name[0] = '\0'; 7738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size) 7768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char cmdline[256]; 7788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 7798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall snprintf(cmdline, sizeof(cmdline), "/system/bin/make_ext4fs -a /data -l %lld %s", 7818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall size * 512, crypto_blkdev); 7828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGI("Making empty filesystem with command %s\n", cmdline); 7838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (system(cmdline)) { 7848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error creating empty filesystem on %s\n", crypto_blkdev); 7858f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 7868f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Successfully created empty filesystem on %s\n", crypto_blkdev); 7878f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 7888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 7898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 7918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 7938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_read(int fd, void* buff, int len) 7948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 7958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 7968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR); 7978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 7988f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 7998f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8008f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic inline int unix_write(int fd, const void* buff, int len) 8018f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 8028f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int ret; 8038f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR); 8048f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return ret; 8058f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 8068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_INPLACE_BUFSIZE 4096 8088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) 8098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallstatic int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size) 8108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 8118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int realfd, cryptofd; 8128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char *buf[CRYPT_INPLACE_BUFSIZE]; 8138f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int rc = -1; 8148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall off64_t numblocks, i, remainder; 8158ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall off64_t one_pct, cur_pct, new_pct; 8168ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { 8188f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); 8198f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8208f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8218f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8228f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { 8238f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 8248f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 8258f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 8268f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8278f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8288f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* This is pretty much a simple loop of reading 4K, and writing 4K. 8298f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * The size passed in is the number of 512 byte sectors in the filesystem. 8308f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * So compute the number of whole 4K blocks we should read/write, 8318f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall * and the remainder. 8328f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 8338f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; 8348f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall remainder = size % CRYPT_SECTORS_PER_BUFSIZE; 8358f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8368f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Encrypting filesystem in place..."); 8378f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8388ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall one_pct = numblocks / 100; 8398ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cur_pct = 0; 8408f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* process the majority of the filesystem in blocks */ 8418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<numblocks; i++) { 8428ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall new_pct = i / one_pct; 8438ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (new_pct > cur_pct) { 8448ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char buf[8]; 8458ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8468ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cur_pct = new_pct; 8478ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall snprintf(buf, sizeof(buf), "%lld", cur_pct); 8488ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.encrypt_progress", buf); 8498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 8508f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 8518f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); 8528f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 8538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8548f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { 8558f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 8568f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 8578f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8588f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8598f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8608f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Do any remaining sectors */ 8618f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall for (i=0; i<remainder; i++) { 8628f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_read(realfd, buf, 512) <= 0) { 8638f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); 8648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 8658f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8668f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (unix_write(cryptofd, buf, 512) <= 0) { 8678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); 8688f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall goto errout; 8698f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8708f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 8718f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8728ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.encrypt_progress", "100"); 8738ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8748f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall rc = 0; 8758f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8768f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallerrout: 8778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(realfd); 8788f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall close(cryptofd); 8798f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8808f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return rc; 8818f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 8828f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 8838f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_WIPE 1 8848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall#define CRYPTO_ENABLE_INPLACE 2 8858ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8868ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall#define FRAMEWORK_BOOT_WAIT 60 8878ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 8888f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrallint cryptfs_enable(char *howarg, char *passwd) 8898f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall{ 8908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall int how = 0; 8918f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN]; 8928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall char fs_type[32], fs_options[256], mount_point[32]; 8938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned long mnt_flags, nr_sec; 8948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall unsigned char master_key[16], decrypted_master_key[16]; 895e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char salt[SALT_LEN]; 8968ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall int rc=-1, fd, i; 8978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall struct crypt_mnt_ftr crypt_ftr; 8988ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char tmpfs_options[80]; 8990cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall char encrypted_state[32]; 9000cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall 9010cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall property_get("ro.crypto.state", encrypted_state, ""); 9020cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall if (strcmp(encrypted_state, "unencrypted")) { 9030cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("Device is already running encrypted, aborting"); 9043ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 9050cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall } 9068f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9078f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall if (!strcmp(howarg, "wipe")) { 9088f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_WIPE; 9098f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else if (! strcmp(howarg, "inplace")) { 9108f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall how = CRYPTO_ENABLE_INPLACE; 9118f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 9128f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Shouldn't happen, as CommandListener vets the args */ 9133ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 9148f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 9158f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9168f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall get_orig_mount_parms(mount_point, fs_type, real_blkdev, &mnt_flags, fs_options); 9178f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9183ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* Get the size of the real block device */ 9193ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall fd = open(real_blkdev, O_RDONLY); 9203ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if ( (nr_sec = get_blkdev_size(fd)) == 0) { 9213ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Cannot get size of block device %s\n", real_blkdev); 9223ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 9233ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 9243ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall close(fd); 9253ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 9263ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* If doing inplace encryption, make sure the orig fs doesn't include the crypto footer */ 9273ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (how == CRYPTO_ENABLE_INPLACE) { 9283ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall unsigned int fs_size_sec, max_fs_size_sec; 9293ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 9303ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall fs_size_sec = get_fs_size(real_blkdev); 9313ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall max_fs_size_sec = nr_sec - (CRYPT_FOOTER_OFFSET / 512); 9323ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 9333ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall if (fs_size_sec > max_fs_size_sec) { 9343ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Orig filesystem overlaps crypto footer region. Cannot encrypt in place."); 9353ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 9363ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 9373ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } 9383ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 9398f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* The init files are setup to stop the class main and late start when 9408ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * vold sets trigger_shutdown_framework. 9418f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall */ 9428f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall property_set("vold.decrypt", "trigger_shutdown_framework"); 9438f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall SLOGD("Just asked init to shut down class main\n"); 9448f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9452eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall if (wait_and_unmount("/mnt/sdcard")) { 9463ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 9472eaf7138528d30c331d83ab8346a97e66b5499e2Ken Sumrall } 9488f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9498f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall /* Now unmount the /data partition. */ 9508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (wait_and_unmount(DATA_MNT_POINT)) { 9513ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 9528ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9538f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9548ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Do extra work for a better UX when doing the long inplace encryption */ 9558ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (how == CRYPTO_ENABLE_INPLACE) { 9568ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Now that /data is unmounted, we need to mount a tmpfs 9578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * /data, set a property saying we're doing inplace encryption, 9588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall * and restart the framework. 9598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 9608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("ro.crypto.tmpfs_options", tmpfs_options, ""); 9618ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (mount("tmpfs", DATA_MNT_POINT, "tmpfs", MS_NOATIME | MS_NOSUID | MS_NODEV, 9628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall tmpfs_options) < 0) { 9633ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 9648f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 9658ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Tells the framework that inplace encryption is starting */ 9667df84120b25dca713f623528801385b00208c2aaKen Sumrall property_set("vold.encrypt_progress", "0"); 9678f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* restart the framework. */ 9698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Create necessary paths on /data */ 9708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (prep_data_fs()) { 9713ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_shutting_down; 9728f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 9738f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9748ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* startup service classes main and late_start */ 9758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_set("vold.decrypt", "trigger_restart_min_framework"); 9768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGD("Just triggered restart_min_framework\n"); 9778f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9787df84120b25dca713f623528801385b00208c2aaKen Sumrall /* OK, the framework is restarted and will soon be showing a 9797df84120b25dca713f623528801385b00208c2aaKen Sumrall * progress bar. Time to setup an encrypted mapping, and 9807df84120b25dca713f623528801385b00208c2aaKen Sumrall * either write a new filesystem, or encrypt in place updating 9817df84120b25dca713f623528801385b00208c2aaKen Sumrall * the progress bar as we work. 9828ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall */ 9838ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9848f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 9858ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Start the actual work of making an encrypted filesystem */ 9868ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Initialize a crypt_mnt_ftr for the partition */ 9878ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall cryptfs_init_crypt_mnt_ftr(&crypt_ftr); 9888ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512); 9898ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); 9908ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9918ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Make an encrypted master key */ 992e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (create_encrypted_random_key(passwd, master_key, salt)) { 9938ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("Cannot create encrypted master key\n"); 9943ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 9958ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 9968ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 9978ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Write the key to the end of the partition */ 998e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, master_key, salt); 9998ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 1000e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall decrypt_master_key(passwd, salt, master_key, decrypted_master_key); 10018ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev); 10028ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10038ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (how == CRYPTO_ENABLE_WIPE) { 10048ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size); 10058ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else if (how == CRYPTO_ENABLE_INPLACE) { 10068ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size); 10078ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } else { 10088ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Shouldn't happen */ 10098ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("cryptfs_enable: internal error, unknown option\n"); 10103ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall goto error_unencrypted; 10118ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 10128ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10138ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Undo the dm-crypt mapping whether we succeed or not */ 10148ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall delete_crypto_blk_dev(crypto_blkdev); 10158ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10168ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! rc) { 10178ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* Success */ 10188ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall sleep(2); /* Give the UI a change to show 100% progress */ 10198ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall sync(); 10208ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall reboot(LINUX_REBOOT_CMD_RESTART); 10213ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall } else { 10223ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_partially_encrypted"); 10233ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return -1; 10248ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 10258ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10263ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* hrm, the encrypt step claims success, but the reboot failed. 10273ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * This should not happen. 10283ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * Set the property and return. Hope the framework can deal with it. 10293ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall */ 10303ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_reboot_failed"); 10318ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return rc; 10323ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 10333ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrallerror_unencrypted: 10343ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_not_encrypted"); 10353ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return -1; 10363ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 10373ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrallerror_shutting_down: 10383ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* we failed, and have not encrypted anthing, so the users's data is still intact, 10393ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * but the framework is stopped and not restarted to show the error, so it's up to 10403ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall * vold to restart the system. 10413ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall */ 10423ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall SLOGE("Error enabling encryption after framework is shutdown, no data changed, restarting system"); 10433ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall sync(); 10443ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall reboot(LINUX_REBOOT_CMD_RESTART); 10453ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall 10463ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall /* shouldn't get here */ 10473ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall property_set("vold.encrypt_progress", "error_shutting_down"); 10483ed8236de11a1be8b45d4c37b2208682f5e97c72Ken Sumrall return -1; 10498ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall} 10508ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10518ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrallint cryptfs_changepw(char *oldpw, char *newpw) 10528ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall{ 10538ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall struct crypt_mnt_ftr crypt_ftr; 10548ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char encrypted_master_key[32], decrypted_master_key[32]; 1055e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall unsigned char salt[SALT_LEN]; 10568ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall unsigned char new_key_sha1[20]; 10578ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall char real_blkdev[MAXPATHLEN]; 10588ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10598ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* This is only allowed after we've successfully decrypted the master key */ 10608ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! key_sha1_saved) { 10610cc166385a7e1d3026bbcb62f094e419f779e872Ken Sumrall SLOGE("Key not saved, aborting"); 10628ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 10638ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 10648ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10658ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall property_get("ro.crypto.fs_real_blkdev", real_blkdev, ""); 10668ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (strlen(real_blkdev) == 0) { 106757b63e61cb41e377708a4fdf18ecc80eb1b2b521Ken Sumrall SLOGE("Can't find real blkdev"); 10688ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 10698ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 10708ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10718ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* get key */ 1072e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) { 107357b63e61cb41e377708a4fdf18ecc80eb1b2b521Ken Sumrall SLOGE("Error getting crypt footer and key"); 10748ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall return -1; 10758ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall } 10768ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10778ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* decrypt key with old passwd */ 1078e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall decrypt_master_key(oldpw, salt, encrypted_master_key, decrypted_master_key); 10798ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10808ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* compute sha1 of decrypted key */ 10818ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SHA1(decrypted_master_key, KEY_LEN_BYTES, new_key_sha1); 10828ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10838ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* If computed sha1 and saved sha1 match, encrypt key with new passwd */ 10848ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall if (! memcmp(saved_key_sha1, new_key_sha1, sizeof(saved_key_sha1))) { 10858ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* they match, it's safe to re-encrypt the key */ 1086e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall encrypt_master_key(newpw, salt, decrypted_master_key, encrypted_master_key); 10878ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall 10888ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall /* save the key */ 1089e87440703663f5ee326326f6438f3b00ea315623Ken Sumrall put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, 0); 10908f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } else { 10918ddbe40a8a8708dac7c472fa8c098c8f7b24534cKen Sumrall SLOGE("SHA1 mismatch"); 10928f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return -1; 10938f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall } 10948f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 10958f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall return 0; 10968f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall} 10978f869aa1bc685b505c58e97b4e11a9c7491a16f9Ken Sumrall 1098