Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | /* TO DO: |
| 18 | * 1. Perhaps keep several copies of the encrypted key, in case something |
| 19 | * goes horribly wrong? |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <sys/types.h> |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 24 | #include <sys/wait.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 25 | #include <sys/stat.h> |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 26 | #include <ctype.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 27 | #include <fcntl.h> |
| 28 | #include <unistd.h> |
| 29 | #include <stdio.h> |
| 30 | #include <sys/ioctl.h> |
| 31 | #include <linux/dm-ioctl.h> |
| 32 | #include <libgen.h> |
| 33 | #include <stdlib.h> |
| 34 | #include <sys/param.h> |
| 35 | #include <string.h> |
| 36 | #include <sys/mount.h> |
| 37 | #include <openssl/evp.h> |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 38 | #include <openssl/sha.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 39 | #include <errno.h> |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 40 | #include <ext4.h> |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 41 | #include <linux/kdev_t.h> |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 42 | #include <fs_mgr.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 43 | #include "cryptfs.h" |
| 44 | #define LOG_TAG "Cryptfs" |
| 45 | #include "cutils/log.h" |
| 46 | #include "cutils/properties.h" |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 47 | #include "cutils/android_reboot.h" |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 48 | #include "hardware_legacy/power.h" |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 49 | #include <logwrap/logwrap.h> |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 50 | #include "VolumeManager.h" |
Ken Sumrall | 9caab76 | 2013-06-11 19:10:20 -0700 | [diff] [blame] | 51 | #include "VoldUtil.h" |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 52 | #include "crypto_scrypt.h" |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 53 | #include "ext4_utils.h" |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 54 | |
Mark Salyzyn | 3e97127 | 2014-01-21 13:27:04 -0800 | [diff] [blame] | 55 | #define UNUSED __attribute__((unused)) |
| 56 | |
Mark Salyzyn | 5eecc44 | 2014-02-12 14:16:14 -0800 | [diff] [blame] | 57 | #define UNUSED __attribute__((unused)) |
| 58 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 59 | #define DM_CRYPT_BUF_SIZE 4096 |
| 60 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 61 | #define HASH_COUNT 2000 |
| 62 | #define KEY_LEN_BYTES 16 |
| 63 | #define IV_LEN_BYTES 16 |
| 64 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 65 | #define KEY_IN_FOOTER "footer" |
| 66 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 67 | // "default_password" encoded into hex (d=0x64 etc) |
| 68 | #define DEFAULT_PASSWORD "64656661756c745f70617373776f7264" |
| 69 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 70 | #define EXT4_FS 1 |
| 71 | #define FAT_FS 2 |
| 72 | |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 73 | #define TABLE_LOAD_RETRIES 10 |
| 74 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 75 | char *me = "cryptfs"; |
| 76 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 77 | static unsigned char saved_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 78 | static char *saved_mount_point; |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 79 | static int master_key_saved = 0; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 80 | static struct crypt_persist_data *persist_data = NULL; |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 81 | |
| 82 | extern struct fstab *fstab; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 83 | |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 84 | static void cryptfs_reboot(int recovery) |
| 85 | { |
| 86 | if (recovery) { |
| 87 | property_set(ANDROID_RB_PROPERTY, "reboot,recovery"); |
| 88 | } else { |
| 89 | property_set(ANDROID_RB_PROPERTY, "reboot"); |
| 90 | } |
| 91 | sleep(20); |
| 92 | |
| 93 | /* Shouldn't get here, reboot should happen before sleep times out */ |
| 94 | return; |
| 95 | } |
| 96 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 97 | static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) |
| 98 | { |
| 99 | memset(io, 0, dataSize); |
| 100 | io->data_size = dataSize; |
| 101 | io->data_start = sizeof(struct dm_ioctl); |
| 102 | io->version[0] = 4; |
| 103 | io->version[1] = 0; |
| 104 | io->version[2] = 0; |
| 105 | io->flags = flags; |
| 106 | if (name) { |
| 107 | strncpy(io->name, name, sizeof(io->name)); |
| 108 | } |
| 109 | } |
| 110 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 111 | /** |
| 112 | * Gets the default device scrypt parameters for key derivation time tuning. |
| 113 | * The parameters should lead to about one second derivation time for the |
| 114 | * given device. |
| 115 | */ |
| 116 | static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) { |
| 117 | const int default_params[] = SCRYPT_DEFAULTS; |
| 118 | int params[] = SCRYPT_DEFAULTS; |
| 119 | char paramstr[PROPERTY_VALUE_MAX]; |
| 120 | char *token; |
| 121 | char *saveptr; |
| 122 | int i; |
| 123 | |
| 124 | property_get(SCRYPT_PROP, paramstr, ""); |
| 125 | if (paramstr[0] != '\0') { |
| 126 | /* |
| 127 | * The token we're looking for should be three integers separated by |
| 128 | * colons (e.g., "12:8:1"). Scan the property to make sure it matches. |
| 129 | */ |
Kenny Root | 2947e34 | 2013-08-14 15:54:49 -0700 | [diff] [blame] | 130 | for (i = 0, token = strtok_r(paramstr, ":", &saveptr); |
| 131 | token != NULL && i < 3; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 132 | i++, token = strtok_r(NULL, ":", &saveptr)) { |
| 133 | char *endptr; |
| 134 | params[i] = strtol(token, &endptr, 10); |
| 135 | |
| 136 | /* |
| 137 | * Check that there was a valid number and it's 8-bit. If not, |
| 138 | * break out and the end check will take the default values. |
| 139 | */ |
| 140 | if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) { |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * If there were not enough tokens or a token was malformed (not an |
| 147 | * integer), it will end up here and the default parameters can be |
| 148 | * taken. |
| 149 | */ |
| 150 | if ((i != 3) || (token != NULL)) { |
| 151 | SLOGW("bad scrypt parameters '%s' should be like '12:8:1'; using defaults", paramstr); |
| 152 | memcpy(params, default_params, sizeof(params)); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | ftr->N_factor = params[0]; |
| 157 | ftr->r_factor = params[1]; |
| 158 | ftr->p_factor = params[2]; |
| 159 | } |
| 160 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 161 | static unsigned int get_fs_size(char *dev) |
| 162 | { |
| 163 | int fd, block_size; |
| 164 | struct ext4_super_block sb; |
| 165 | off64_t len; |
| 166 | |
| 167 | if ((fd = open(dev, O_RDONLY)) < 0) { |
| 168 | SLOGE("Cannot open device to get filesystem size "); |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | if (lseek64(fd, 1024, SEEK_SET) < 0) { |
| 173 | SLOGE("Cannot seek to superblock"); |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { |
| 178 | SLOGE("Cannot read superblock"); |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | close(fd); |
| 183 | |
| 184 | block_size = 1024 << sb.s_log_block_size; |
| 185 | /* compute length in bytes */ |
| 186 | len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; |
| 187 | |
| 188 | /* return length in sectors */ |
| 189 | return (unsigned int) (len / 512); |
| 190 | } |
| 191 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 192 | static int get_crypt_ftr_info(char **metadata_fname, off64_t *off) |
| 193 | { |
| 194 | static int cached_data = 0; |
| 195 | static off64_t cached_off = 0; |
| 196 | static char cached_metadata_fname[PROPERTY_VALUE_MAX] = ""; |
| 197 | int fd; |
| 198 | char key_loc[PROPERTY_VALUE_MAX]; |
| 199 | char real_blkdev[PROPERTY_VALUE_MAX]; |
| 200 | unsigned int nr_sec; |
| 201 | int rc = -1; |
| 202 | |
| 203 | if (!cached_data) { |
| 204 | fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc)); |
| 205 | |
| 206 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 207 | if ( (fd = open(real_blkdev, O_RDWR)) < 0) { |
| 208 | SLOGE("Cannot open real block device %s\n", real_blkdev); |
| 209 | return -1; |
| 210 | } |
| 211 | |
| 212 | if ((nr_sec = get_blkdev_size(fd))) { |
| 213 | /* If it's an encrypted Android partition, the last 16 Kbytes contain the |
| 214 | * encryption info footer and key, and plenty of bytes to spare for future |
| 215 | * growth. |
| 216 | */ |
| 217 | strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname)); |
| 218 | cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; |
| 219 | cached_data = 1; |
| 220 | } else { |
| 221 | SLOGE("Cannot get size of block device %s\n", real_blkdev); |
| 222 | } |
| 223 | close(fd); |
| 224 | } else { |
| 225 | strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname)); |
| 226 | cached_off = 0; |
| 227 | cached_data = 1; |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | if (cached_data) { |
| 232 | if (metadata_fname) { |
| 233 | *metadata_fname = cached_metadata_fname; |
| 234 | } |
| 235 | if (off) { |
| 236 | *off = cached_off; |
| 237 | } |
| 238 | rc = 0; |
| 239 | } |
| 240 | |
| 241 | return rc; |
| 242 | } |
| 243 | |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 244 | /* key or salt can be NULL, in which case just skip writing that value. Useful to |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 245 | * update the failed mount count but not change the key. |
| 246 | */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 247 | static int put_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 248 | { |
| 249 | int fd; |
| 250 | unsigned int nr_sec, cnt; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 251 | /* starting_off is set to the SEEK_SET offset |
| 252 | * where the crypto structure starts |
| 253 | */ |
| 254 | off64_t starting_off; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 255 | int rc = -1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 256 | char *fname = NULL; |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 257 | struct stat statbuf; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 258 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 259 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 260 | SLOGE("Unable to get crypt_ftr_info\n"); |
| 261 | return -1; |
| 262 | } |
| 263 | if (fname[0] != '/') { |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 264 | SLOGE("Unexpected value for crypto key location\n"); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 265 | return -1; |
| 266 | } |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 267 | if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) { |
| 268 | SLOGE("Cannot open footer file %s for put\n", fname); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 269 | return -1; |
| 270 | } |
| 271 | |
| 272 | /* Seek to the start of the crypt footer */ |
| 273 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 274 | SLOGE("Cannot seek to real block device footer\n"); |
| 275 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 276 | } |
| 277 | |
| 278 | if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 279 | SLOGE("Cannot write real block device footer\n"); |
| 280 | goto errout; |
| 281 | } |
| 282 | |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 283 | fstat(fd, &statbuf); |
| 284 | /* If the keys are kept on a raw block device, do not try to truncate it. */ |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 285 | if (S_ISREG(statbuf.st_mode)) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 286 | if (ftruncate(fd, 0x4000)) { |
Colin Cross | 59846b6 | 2014-02-06 20:34:29 -0800 | [diff] [blame] | 287 | SLOGE("Cannot set footer file size\n"); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 288 | goto errout; |
| 289 | } |
| 290 | } |
| 291 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 292 | /* Success! */ |
| 293 | rc = 0; |
| 294 | |
| 295 | errout: |
| 296 | close(fd); |
| 297 | return rc; |
| 298 | |
| 299 | } |
| 300 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 301 | static inline int unix_read(int fd, void* buff, int len) |
| 302 | { |
| 303 | return TEMP_FAILURE_RETRY(read(fd, buff, len)); |
| 304 | } |
| 305 | |
| 306 | static inline int unix_write(int fd, const void* buff, int len) |
| 307 | { |
| 308 | return TEMP_FAILURE_RETRY(write(fd, buff, len)); |
| 309 | } |
| 310 | |
| 311 | static void init_empty_persist_data(struct crypt_persist_data *pdata, int len) |
| 312 | { |
| 313 | memset(pdata, 0, len); |
| 314 | pdata->persist_magic = PERSIST_DATA_MAGIC; |
| 315 | pdata->persist_valid_entries = 0; |
| 316 | } |
| 317 | |
| 318 | /* A routine to update the passed in crypt_ftr to the lastest version. |
| 319 | * fd is open read/write on the device that holds the crypto footer and persistent |
| 320 | * data, crypt_ftr is a pointer to the struct to be updated, and offset is the |
| 321 | * absolute offset to the start of the crypt_mnt_ftr on the passed in fd. |
| 322 | */ |
| 323 | static void upgrade_crypt_ftr(int fd, struct crypt_mnt_ftr *crypt_ftr, off64_t offset) |
| 324 | { |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 325 | int orig_major = crypt_ftr->major_version; |
| 326 | int orig_minor = crypt_ftr->minor_version; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 327 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 328 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 0)) { |
| 329 | struct crypt_persist_data *pdata; |
| 330 | off64_t pdata_offset = offset + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 331 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 332 | SLOGW("upgrading crypto footer to 1.1"); |
| 333 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 334 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 335 | if (pdata == NULL) { |
| 336 | SLOGE("Cannot allocate persisent data\n"); |
| 337 | return; |
| 338 | } |
| 339 | memset(pdata, 0, CRYPT_PERSIST_DATA_SIZE); |
| 340 | |
| 341 | /* Need to initialize the persistent data area */ |
| 342 | if (lseek64(fd, pdata_offset, SEEK_SET) == -1) { |
| 343 | SLOGE("Cannot seek to persisent data offset\n"); |
| 344 | return; |
| 345 | } |
| 346 | /* Write all zeros to the first copy, making it invalid */ |
| 347 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 348 | |
| 349 | /* Write a valid but empty structure to the second copy */ |
| 350 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 351 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 352 | |
| 353 | /* Update the footer */ |
| 354 | crypt_ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 355 | crypt_ftr->persist_data_offset[0] = pdata_offset; |
| 356 | crypt_ftr->persist_data_offset[1] = pdata_offset + CRYPT_PERSIST_DATA_SIZE; |
| 357 | crypt_ftr->minor_version = 1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 360 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 1)) { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 361 | SLOGW("upgrading crypto footer to 1.2"); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 362 | /* But keep the old kdf_type. |
| 363 | * It will get updated later to KDF_SCRYPT after the password has been verified. |
| 364 | */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 365 | crypt_ftr->kdf_type = KDF_PBKDF2; |
| 366 | get_device_scrypt_params(crypt_ftr); |
| 367 | crypt_ftr->minor_version = 2; |
| 368 | } |
| 369 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 370 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 2)) { |
| 371 | SLOGW("upgrading crypto footer to 1.3"); |
| 372 | crypt_ftr->crypt_type = CRYPT_TYPE_PASSWORD; |
| 373 | crypt_ftr->minor_version = 3; |
| 374 | } |
| 375 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 376 | if ((orig_major != crypt_ftr->major_version) || (orig_minor != crypt_ftr->minor_version)) { |
| 377 | if (lseek64(fd, offset, SEEK_SET) == -1) { |
| 378 | SLOGE("Cannot seek to crypt footer\n"); |
| 379 | return; |
| 380 | } |
| 381 | unix_write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr)); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 382 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | |
| 386 | static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 387 | { |
| 388 | int fd; |
| 389 | unsigned int nr_sec, cnt; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 390 | off64_t starting_off; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 391 | int rc = -1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 392 | char *fname = NULL; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 393 | struct stat statbuf; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 394 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 395 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 396 | SLOGE("Unable to get crypt_ftr_info\n"); |
| 397 | return -1; |
| 398 | } |
| 399 | if (fname[0] != '/') { |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 400 | SLOGE("Unexpected value for crypto key location\n"); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 401 | return -1; |
| 402 | } |
| 403 | if ( (fd = open(fname, O_RDWR)) < 0) { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 404 | SLOGE("Cannot open footer file %s for get\n", fname); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 405 | return -1; |
| 406 | } |
| 407 | |
| 408 | /* Make sure it's 16 Kbytes in length */ |
| 409 | fstat(fd, &statbuf); |
| 410 | if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { |
| 411 | SLOGE("footer file %s is not the expected size!\n", fname); |
| 412 | goto errout; |
| 413 | } |
| 414 | |
| 415 | /* Seek to the start of the crypt footer */ |
| 416 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 417 | SLOGE("Cannot seek to real block device footer\n"); |
| 418 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 422 | SLOGE("Cannot read real block device footer\n"); |
| 423 | goto errout; |
| 424 | } |
| 425 | |
| 426 | if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 427 | SLOGE("Bad magic for real block device %s\n", fname); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 428 | goto errout; |
| 429 | } |
| 430 | |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 431 | if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) { |
| 432 | SLOGE("Cannot understand major version %d real block device footer; expected %d\n", |
| 433 | crypt_ftr->major_version, CURRENT_MAJOR_VERSION); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 434 | goto errout; |
| 435 | } |
| 436 | |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 437 | if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) { |
| 438 | SLOGW("Warning: crypto footer minor version %d, expected <= %d, continuing...\n", |
| 439 | crypt_ftr->minor_version, CURRENT_MINOR_VERSION); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 440 | } |
| 441 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 442 | /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the |
| 443 | * copy on disk before returning. |
| 444 | */ |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 445 | if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 446 | upgrade_crypt_ftr(fd, crypt_ftr, starting_off); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 447 | } |
| 448 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 449 | /* Success! */ |
| 450 | rc = 0; |
| 451 | |
| 452 | errout: |
| 453 | close(fd); |
| 454 | return rc; |
| 455 | } |
| 456 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 457 | static int validate_persistent_data_storage(struct crypt_mnt_ftr *crypt_ftr) |
| 458 | { |
| 459 | if (crypt_ftr->persist_data_offset[0] + crypt_ftr->persist_data_size > |
| 460 | crypt_ftr->persist_data_offset[1]) { |
| 461 | SLOGE("Crypt_ftr persist data regions overlap"); |
| 462 | return -1; |
| 463 | } |
| 464 | |
| 465 | if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) { |
| 466 | SLOGE("Crypt_ftr persist data region 0 starts after region 1"); |
| 467 | return -1; |
| 468 | } |
| 469 | |
| 470 | if (((crypt_ftr->persist_data_offset[1] + crypt_ftr->persist_data_size) - |
| 471 | (crypt_ftr->persist_data_offset[0] - CRYPT_FOOTER_TO_PERSIST_OFFSET)) > |
| 472 | CRYPT_FOOTER_OFFSET) { |
| 473 | SLOGE("Persistent data extends past crypto footer"); |
| 474 | return -1; |
| 475 | } |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | static int load_persistent_data(void) |
| 481 | { |
| 482 | struct crypt_mnt_ftr crypt_ftr; |
| 483 | struct crypt_persist_data *pdata = NULL; |
| 484 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 485 | char *fname; |
| 486 | int found = 0; |
| 487 | int fd; |
| 488 | int ret; |
| 489 | int i; |
| 490 | |
| 491 | if (persist_data) { |
| 492 | /* Nothing to do, we've already loaded or initialized it */ |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | |
| 497 | /* If not encrypted, just allocate an empty table and initialize it */ |
| 498 | property_get("ro.crypto.state", encrypted_state, ""); |
| 499 | if (strcmp(encrypted_state, "encrypted") ) { |
| 500 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 501 | if (pdata) { |
| 502 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 503 | persist_data = pdata; |
| 504 | return 0; |
| 505 | } |
| 506 | return -1; |
| 507 | } |
| 508 | |
| 509 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 510 | return -1; |
| 511 | } |
| 512 | |
| 513 | if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) { |
| 514 | SLOGE("Crypt_ftr version doesn't support persistent data"); |
| 515 | return -1; |
| 516 | } |
| 517 | |
| 518 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 519 | return -1; |
| 520 | } |
| 521 | |
| 522 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 523 | if (ret) { |
| 524 | return -1; |
| 525 | } |
| 526 | |
| 527 | fd = open(fname, O_RDONLY); |
| 528 | if (fd < 0) { |
| 529 | SLOGE("Cannot open %s metadata file", fname); |
| 530 | return -1; |
| 531 | } |
| 532 | |
| 533 | if (persist_data == NULL) { |
| 534 | pdata = malloc(crypt_ftr.persist_data_size); |
| 535 | if (pdata == NULL) { |
| 536 | SLOGE("Cannot allocate memory for persistent data"); |
| 537 | goto err; |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | for (i = 0; i < 2; i++) { |
| 542 | if (lseek64(fd, crypt_ftr.persist_data_offset[i], SEEK_SET) < 0) { |
| 543 | SLOGE("Cannot seek to read persistent data on %s", fname); |
| 544 | goto err2; |
| 545 | } |
| 546 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){ |
| 547 | SLOGE("Error reading persistent data on iteration %d", i); |
| 548 | goto err2; |
| 549 | } |
| 550 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 551 | found = 1; |
| 552 | break; |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | if (!found) { |
| 557 | SLOGI("Could not find valid persistent data, creating"); |
| 558 | init_empty_persist_data(pdata, crypt_ftr.persist_data_size); |
| 559 | } |
| 560 | |
| 561 | /* Success */ |
| 562 | persist_data = pdata; |
| 563 | close(fd); |
| 564 | return 0; |
| 565 | |
| 566 | err2: |
| 567 | free(pdata); |
| 568 | |
| 569 | err: |
| 570 | close(fd); |
| 571 | return -1; |
| 572 | } |
| 573 | |
| 574 | static int save_persistent_data(void) |
| 575 | { |
| 576 | struct crypt_mnt_ftr crypt_ftr; |
| 577 | struct crypt_persist_data *pdata; |
| 578 | char *fname; |
| 579 | off64_t write_offset; |
| 580 | off64_t erase_offset; |
| 581 | int found = 0; |
| 582 | int fd; |
| 583 | int ret; |
| 584 | |
| 585 | if (persist_data == NULL) { |
| 586 | SLOGE("No persistent data to save"); |
| 587 | return -1; |
| 588 | } |
| 589 | |
| 590 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 591 | return -1; |
| 592 | } |
| 593 | |
| 594 | if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) { |
| 595 | SLOGE("Crypt_ftr version doesn't support persistent data"); |
| 596 | return -1; |
| 597 | } |
| 598 | |
| 599 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 600 | if (ret) { |
| 601 | return -1; |
| 602 | } |
| 603 | |
| 604 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 605 | return -1; |
| 606 | } |
| 607 | |
| 608 | fd = open(fname, O_RDWR); |
| 609 | if (fd < 0) { |
| 610 | SLOGE("Cannot open %s metadata file", fname); |
| 611 | return -1; |
| 612 | } |
| 613 | |
| 614 | pdata = malloc(crypt_ftr.persist_data_size); |
| 615 | if (pdata == NULL) { |
| 616 | SLOGE("Cannot allocate persistant data"); |
| 617 | goto err; |
| 618 | } |
| 619 | |
| 620 | if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) { |
| 621 | SLOGE("Cannot seek to read persistent data on %s", fname); |
| 622 | goto err2; |
| 623 | } |
| 624 | |
| 625 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) { |
| 626 | SLOGE("Error reading persistent data before save"); |
| 627 | goto err2; |
| 628 | } |
| 629 | |
| 630 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 631 | /* The first copy is the curent valid copy, so write to |
| 632 | * the second copy and erase this one */ |
| 633 | write_offset = crypt_ftr.persist_data_offset[1]; |
| 634 | erase_offset = crypt_ftr.persist_data_offset[0]; |
| 635 | } else { |
| 636 | /* The second copy must be the valid copy, so write to |
| 637 | * the first copy, and erase the second */ |
| 638 | write_offset = crypt_ftr.persist_data_offset[0]; |
| 639 | erase_offset = crypt_ftr.persist_data_offset[1]; |
| 640 | } |
| 641 | |
| 642 | /* Write the new copy first, if successful, then erase the old copy */ |
| 643 | if (lseek(fd, write_offset, SEEK_SET) < 0) { |
| 644 | SLOGE("Cannot seek to write persistent data"); |
| 645 | goto err2; |
| 646 | } |
| 647 | if (unix_write(fd, persist_data, crypt_ftr.persist_data_size) == |
| 648 | (int) crypt_ftr.persist_data_size) { |
| 649 | if (lseek(fd, erase_offset, SEEK_SET) < 0) { |
| 650 | SLOGE("Cannot seek to erase previous persistent data"); |
| 651 | goto err2; |
| 652 | } |
| 653 | fsync(fd); |
| 654 | memset(pdata, 0, crypt_ftr.persist_data_size); |
| 655 | if (unix_write(fd, pdata, crypt_ftr.persist_data_size) != |
| 656 | (int) crypt_ftr.persist_data_size) { |
| 657 | SLOGE("Cannot write to erase previous persistent data"); |
| 658 | goto err2; |
| 659 | } |
| 660 | fsync(fd); |
| 661 | } else { |
| 662 | SLOGE("Cannot write to save persistent data"); |
| 663 | goto err2; |
| 664 | } |
| 665 | |
| 666 | /* Success */ |
| 667 | free(pdata); |
| 668 | close(fd); |
| 669 | return 0; |
| 670 | |
| 671 | err2: |
| 672 | free(pdata); |
| 673 | err: |
| 674 | close(fd); |
| 675 | return -1; |
| 676 | } |
| 677 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 678 | static int hexdigit (char c) |
| 679 | { |
| 680 | if (c >= '0' && c <= '9') return c - '0'; |
| 681 | c = tolower(c); |
| 682 | if (c >= 'a' && c <= 'f') return c - 'a' + 10; |
| 683 | return -1; |
| 684 | } |
| 685 | |
| 686 | static unsigned char* convert_hex_ascii_to_key(const char* master_key_ascii, |
| 687 | unsigned int* out_keysize) |
| 688 | { |
| 689 | unsigned int i; |
| 690 | *out_keysize = 0; |
| 691 | |
| 692 | size_t size = strlen (master_key_ascii); |
| 693 | if (size % 2) { |
| 694 | SLOGE("Trying to convert ascii string of odd length"); |
| 695 | return NULL; |
| 696 | } |
| 697 | |
| 698 | unsigned char* master_key = (unsigned char*) malloc(size / 2); |
| 699 | if (master_key == 0) { |
| 700 | SLOGE("Cannot allocate"); |
| 701 | return NULL; |
| 702 | } |
| 703 | |
| 704 | for (i = 0; i < size; i += 2) { |
| 705 | int high_nibble = hexdigit (master_key_ascii[i]); |
| 706 | int low_nibble = hexdigit (master_key_ascii[i + 1]); |
| 707 | |
| 708 | if(high_nibble < 0 || low_nibble < 0) { |
| 709 | SLOGE("Invalid hex string"); |
| 710 | free (master_key); |
| 711 | return NULL; |
| 712 | } |
| 713 | |
| 714 | master_key[*out_keysize] = high_nibble * 16 + low_nibble; |
| 715 | (*out_keysize)++; |
| 716 | } |
| 717 | |
| 718 | return master_key; |
| 719 | } |
| 720 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 721 | /* Convert a binary key of specified length into an ascii hex string equivalent, |
| 722 | * without the leading 0x and with null termination |
| 723 | */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 724 | static void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 725 | char *master_key_ascii) |
| 726 | { |
| 727 | unsigned int i, a; |
| 728 | unsigned char nibble; |
| 729 | |
| 730 | for (i=0, a=0; i<keysize; i++, a+=2) { |
| 731 | /* For each byte, write out two ascii hex digits */ |
| 732 | nibble = (master_key[i] >> 4) & 0xf; |
| 733 | master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 734 | |
| 735 | nibble = master_key[i] & 0xf; |
| 736 | master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 737 | } |
| 738 | |
| 739 | /* Add the null termination */ |
| 740 | master_key_ascii[a] = '\0'; |
| 741 | |
| 742 | } |
| 743 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 744 | static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
| 745 | char *real_blk_name, const char *name, int fd, |
| 746 | char *extra_params) |
| 747 | { |
| 748 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 749 | struct dm_ioctl *io; |
| 750 | struct dm_target_spec *tgt; |
| 751 | char *crypt_params; |
| 752 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 753 | int i; |
| 754 | |
| 755 | io = (struct dm_ioctl *) buffer; |
| 756 | |
| 757 | /* Load the mapping table for this device */ |
| 758 | tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; |
| 759 | |
| 760 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 761 | io->target_count = 1; |
| 762 | tgt->status = 0; |
| 763 | tgt->sector_start = 0; |
| 764 | tgt->length = crypt_ftr->fs_size; |
| 765 | strcpy(tgt->target_type, "crypt"); |
| 766 | |
| 767 | crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); |
| 768 | convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); |
| 769 | sprintf(crypt_params, "%s %s 0 %s 0 %s", crypt_ftr->crypto_type_name, |
| 770 | master_key_ascii, real_blk_name, extra_params); |
| 771 | crypt_params += strlen(crypt_params) + 1; |
| 772 | crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ |
| 773 | tgt->next = crypt_params - buffer; |
| 774 | |
| 775 | for (i = 0; i < TABLE_LOAD_RETRIES; i++) { |
| 776 | if (! ioctl(fd, DM_TABLE_LOAD, io)) { |
| 777 | break; |
| 778 | } |
| 779 | usleep(500000); |
| 780 | } |
| 781 | |
| 782 | if (i == TABLE_LOAD_RETRIES) { |
| 783 | /* We failed to load the table, return an error */ |
| 784 | return -1; |
| 785 | } else { |
| 786 | return i + 1; |
| 787 | } |
| 788 | } |
| 789 | |
| 790 | |
| 791 | static int get_dm_crypt_version(int fd, const char *name, int *version) |
| 792 | { |
| 793 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 794 | struct dm_ioctl *io; |
| 795 | struct dm_target_versions *v; |
| 796 | int i; |
| 797 | |
| 798 | io = (struct dm_ioctl *) buffer; |
| 799 | |
| 800 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 801 | |
| 802 | if (ioctl(fd, DM_LIST_VERSIONS, io)) { |
| 803 | return -1; |
| 804 | } |
| 805 | |
| 806 | /* Iterate over the returned versions, looking for name of "crypt". |
| 807 | * When found, get and return the version. |
| 808 | */ |
| 809 | v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)]; |
| 810 | while (v->next) { |
| 811 | if (! strcmp(v->name, "crypt")) { |
| 812 | /* We found the crypt driver, return the version, and get out */ |
| 813 | version[0] = v->version[0]; |
| 814 | version[1] = v->version[1]; |
| 815 | version[2] = v->version[2]; |
| 816 | return 0; |
| 817 | } |
| 818 | v = (struct dm_target_versions *)(((char *)v) + v->next); |
| 819 | } |
| 820 | |
| 821 | return -1; |
| 822 | } |
| 823 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 824 | static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 825 | char *real_blk_name, char *crypto_blk_name, const char *name) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 826 | { |
| 827 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 828 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 829 | char *crypt_params; |
| 830 | struct dm_ioctl *io; |
| 831 | struct dm_target_spec *tgt; |
| 832 | unsigned int minor; |
| 833 | int fd; |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 834 | int i; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 835 | int retval = -1; |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 836 | int version[3]; |
| 837 | char *extra_params; |
| 838 | int load_count; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 839 | |
| 840 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 841 | SLOGE("Cannot open device-mapper\n"); |
| 842 | goto errout; |
| 843 | } |
| 844 | |
| 845 | io = (struct dm_ioctl *) buffer; |
| 846 | |
| 847 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 848 | if (ioctl(fd, DM_DEV_CREATE, io)) { |
| 849 | SLOGE("Cannot create dm-crypt device\n"); |
| 850 | goto errout; |
| 851 | } |
| 852 | |
| 853 | /* Get the device status, in particular, the name of it's device file */ |
| 854 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 855 | if (ioctl(fd, DM_DEV_STATUS, io)) { |
| 856 | SLOGE("Cannot retrieve dm-crypt device status\n"); |
| 857 | goto errout; |
| 858 | } |
| 859 | minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); |
| 860 | snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); |
| 861 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 862 | extra_params = ""; |
| 863 | if (! get_dm_crypt_version(fd, name, version)) { |
| 864 | /* Support for allow_discards was added in version 1.11.0 */ |
| 865 | if ((version[0] >= 2) || |
| 866 | ((version[0] == 1) && (version[1] >= 11))) { |
| 867 | extra_params = "1 allow_discards"; |
| 868 | SLOGI("Enabling support for allow_discards in dmcrypt.\n"); |
| 869 | } |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 870 | } |
| 871 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 872 | load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name, |
| 873 | fd, extra_params); |
| 874 | if (load_count < 0) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 875 | SLOGE("Cannot load dm-crypt mapping table.\n"); |
| 876 | goto errout; |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 877 | } else if (load_count > 1) { |
| 878 | SLOGI("Took %d tries to load dmcrypt table.\n", load_count); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 879 | } |
| 880 | |
| 881 | /* Resume this device to activate it */ |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 882 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 883 | |
| 884 | if (ioctl(fd, DM_DEV_SUSPEND, io)) { |
| 885 | SLOGE("Cannot resume the dm-crypt device\n"); |
| 886 | goto errout; |
| 887 | } |
| 888 | |
| 889 | /* We made it here with no errors. Woot! */ |
| 890 | retval = 0; |
| 891 | |
| 892 | errout: |
| 893 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 894 | |
| 895 | return retval; |
| 896 | } |
| 897 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 898 | static int delete_crypto_blk_dev(char *name) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 899 | { |
| 900 | int fd; |
| 901 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 902 | struct dm_ioctl *io; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 903 | int retval = -1; |
| 904 | |
| 905 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 906 | SLOGE("Cannot open device-mapper\n"); |
| 907 | goto errout; |
| 908 | } |
| 909 | |
| 910 | io = (struct dm_ioctl *) buffer; |
| 911 | |
| 912 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 913 | if (ioctl(fd, DM_DEV_REMOVE, io)) { |
| 914 | SLOGE("Cannot remove dm-crypt device\n"); |
| 915 | goto errout; |
| 916 | } |
| 917 | |
| 918 | /* We made it here with no errors. Woot! */ |
| 919 | retval = 0; |
| 920 | |
| 921 | errout: |
| 922 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 923 | |
| 924 | return retval; |
| 925 | |
| 926 | } |
| 927 | |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame^] | 928 | static int pbkdf2(const char *passwd, unsigned char *salt, |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 929 | unsigned char *ikey, void *params UNUSED) |
| 930 | { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 931 | /* Turn the password into a key and IV that can decrypt the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 932 | unsigned int keysize; |
| 933 | char* master_key = (char*)convert_hex_ascii_to_key(passwd, &keysize); |
| 934 | if (!master_key) return -1; |
| 935 | PKCS5_PBKDF2_HMAC_SHA1(master_key, keysize, salt, SALT_LEN, |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 936 | HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 937 | |
| 938 | free (master_key); |
| 939 | return 0; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 940 | } |
| 941 | |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame^] | 942 | static int scrypt(const char *passwd, unsigned char *salt, |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 943 | unsigned char *ikey, void *params) |
| 944 | { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 945 | struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; |
| 946 | |
| 947 | int N = 1 << ftr->N_factor; |
| 948 | int r = 1 << ftr->r_factor; |
| 949 | int p = 1 << ftr->p_factor; |
| 950 | |
| 951 | /* Turn the password into a key and IV that can decrypt the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 952 | unsigned int keysize; |
| 953 | unsigned char* master_key = convert_hex_ascii_to_key(passwd, &keysize); |
| 954 | if (!master_key) return -1; |
| 955 | crypto_scrypt(master_key, keysize, salt, SALT_LEN, N, r, p, ikey, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 956 | KEY_LEN_BYTES + IV_LEN_BYTES); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 957 | |
| 958 | free (master_key); |
| 959 | return 0; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 960 | } |
| 961 | |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame^] | 962 | static int encrypt_master_key(const char *passwd, unsigned char *salt, |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 963 | unsigned char *decrypted_master_key, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 964 | unsigned char *encrypted_master_key, |
| 965 | struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 966 | { |
| 967 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
| 968 | EVP_CIPHER_CTX e_ctx; |
| 969 | int encrypted_len, final_len; |
| 970 | |
| 971 | /* Turn the password into a key and IV that can decrypt the master key */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 972 | get_device_scrypt_params(crypt_ftr); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 973 | if (scrypt(passwd, salt, ikey, crypt_ftr)) { |
| 974 | SLOGE("scrypt failed"); |
| 975 | return -1; |
| 976 | } |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 977 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 978 | /* Initialize the decryption engine */ |
| 979 | if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 980 | SLOGE("EVP_EncryptInit failed\n"); |
| 981 | return -1; |
| 982 | } |
| 983 | EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 984 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 985 | /* Encrypt the master key */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 986 | if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, |
| 987 | decrypted_master_key, KEY_LEN_BYTES)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 988 | SLOGE("EVP_EncryptUpdate failed\n"); |
| 989 | return -1; |
| 990 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 991 | if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 992 | SLOGE("EVP_EncryptFinal failed\n"); |
| 993 | return -1; |
| 994 | } |
| 995 | |
| 996 | if (encrypted_len + final_len != KEY_LEN_BYTES) { |
| 997 | SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); |
| 998 | return -1; |
| 999 | } else { |
| 1000 | return 0; |
| 1001 | } |
| 1002 | } |
| 1003 | |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1004 | static int decrypt_master_key_aux(char *passwd, unsigned char *salt, |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 1005 | unsigned char *encrypted_master_key, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1006 | unsigned char *decrypted_master_key, |
| 1007 | kdf_func kdf, void *kdf_params) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1008 | { |
| 1009 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1010 | EVP_CIPHER_CTX d_ctx; |
| 1011 | int decrypted_len, final_len; |
| 1012 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1013 | /* Turn the password into a key and IV that can decrypt the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1014 | if (kdf(passwd, salt, ikey, kdf_params)) { |
| 1015 | SLOGE("kdf failed"); |
| 1016 | return -1; |
| 1017 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1018 | |
| 1019 | /* Initialize the decryption engine */ |
| 1020 | if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 1021 | return -1; |
| 1022 | } |
| 1023 | EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ |
| 1024 | /* Decrypt the master key */ |
| 1025 | if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, |
| 1026 | encrypted_master_key, KEY_LEN_BYTES)) { |
| 1027 | return -1; |
| 1028 | } |
| 1029 | if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { |
| 1030 | return -1; |
| 1031 | } |
| 1032 | |
| 1033 | if (decrypted_len + final_len != KEY_LEN_BYTES) { |
| 1034 | return -1; |
| 1035 | } else { |
| 1036 | return 0; |
| 1037 | } |
| 1038 | } |
| 1039 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1040 | static void get_kdf_func(struct crypt_mnt_ftr *ftr, kdf_func *kdf, void** kdf_params) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1041 | { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1042 | if (ftr->kdf_type == KDF_SCRYPT) { |
| 1043 | *kdf = scrypt; |
| 1044 | *kdf_params = ftr; |
| 1045 | } else { |
| 1046 | *kdf = pbkdf2; |
| 1047 | *kdf_params = NULL; |
| 1048 | } |
| 1049 | } |
| 1050 | |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1051 | static int decrypt_master_key(char *passwd, unsigned char *decrypted_master_key, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1052 | struct crypt_mnt_ftr *crypt_ftr) |
| 1053 | { |
| 1054 | kdf_func kdf; |
| 1055 | void *kdf_params; |
| 1056 | int ret; |
| 1057 | |
| 1058 | get_kdf_func(crypt_ftr, &kdf, &kdf_params); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1059 | ret = decrypt_master_key_aux(passwd, crypt_ftr->salt, crypt_ftr->master_key, decrypted_master_key, kdf, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1060 | kdf_params); |
| 1061 | if (ret != 0) { |
| 1062 | SLOGW("failure decrypting master key"); |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1063 | } |
| 1064 | |
| 1065 | return ret; |
| 1066 | } |
| 1067 | |
| 1068 | static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt, |
| 1069 | struct crypt_mnt_ftr *crypt_ftr) { |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1070 | int fd; |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 1071 | unsigned char key_buf[KEY_LEN_BYTES]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1072 | EVP_CIPHER_CTX e_ctx; |
| 1073 | int encrypted_len, final_len; |
| 1074 | |
| 1075 | /* Get some random bits for a key */ |
| 1076 | fd = open("/dev/urandom", O_RDONLY); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 1077 | read(fd, key_buf, sizeof(key_buf)); |
| 1078 | read(fd, salt, SALT_LEN); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1079 | close(fd); |
| 1080 | |
| 1081 | /* Now encrypt it with the password */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1082 | return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1083 | } |
| 1084 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1085 | static int wait_and_unmount(char *mountpoint) |
| 1086 | { |
| 1087 | int i, rc; |
Ken Sumrall | 2eaf713 | 2011-01-14 12:45:48 -0800 | [diff] [blame] | 1088 | #define WAIT_UNMOUNT_COUNT 20 |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1089 | |
| 1090 | /* Now umount the tmpfs filesystem */ |
| 1091 | for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { |
| 1092 | if (umount(mountpoint)) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1093 | if (errno == EINVAL) { |
| 1094 | /* EINVAL is returned if the directory is not a mountpoint, |
| 1095 | * i.e. there is no filesystem mounted there. So just get out. |
| 1096 | */ |
| 1097 | break; |
| 1098 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1099 | sleep(1); |
| 1100 | i++; |
| 1101 | } else { |
| 1102 | break; |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | if (i < WAIT_UNMOUNT_COUNT) { |
| 1107 | SLOGD("unmounting %s succeeded\n", mountpoint); |
| 1108 | rc = 0; |
| 1109 | } else { |
| 1110 | SLOGE("unmounting %s failed\n", mountpoint); |
| 1111 | rc = -1; |
| 1112 | } |
| 1113 | |
| 1114 | return rc; |
| 1115 | } |
| 1116 | |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1117 | #define DATA_PREP_TIMEOUT 200 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1118 | static int prep_data_fs(void) |
| 1119 | { |
| 1120 | int i; |
| 1121 | |
| 1122 | /* Do the prep of the /data filesystem */ |
| 1123 | property_set("vold.post_fs_data_done", "0"); |
| 1124 | property_set("vold.decrypt", "trigger_post_fs_data"); |
| 1125 | SLOGD("Just triggered post_fs_data\n"); |
| 1126 | |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1127 | /* Wait a max of 50 seconds, hopefully it takes much less */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1128 | for (i=0; i<DATA_PREP_TIMEOUT; i++) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1129 | char p[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1130 | |
| 1131 | property_get("vold.post_fs_data_done", p, "0"); |
| 1132 | if (*p == '1') { |
| 1133 | break; |
| 1134 | } else { |
| 1135 | usleep(250000); |
| 1136 | } |
| 1137 | } |
| 1138 | if (i == DATA_PREP_TIMEOUT) { |
| 1139 | /* Ugh, we failed to prep /data in time. Bail. */ |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1140 | SLOGE("post_fs_data timed out!\n"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1141 | return -1; |
| 1142 | } else { |
| 1143 | SLOGD("post_fs_data done\n"); |
| 1144 | return 0; |
| 1145 | } |
| 1146 | } |
| 1147 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1148 | static int cryptfs_restart_internal(int restart_main) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1149 | { |
| 1150 | char fs_type[32]; |
| 1151 | char real_blkdev[MAXPATHLEN]; |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1152 | char crypto_blkdev[MAXPATHLEN]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1153 | char fs_options[256]; |
| 1154 | unsigned long mnt_flags; |
| 1155 | struct stat statbuf; |
| 1156 | int rc = -1, i; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1157 | static int restart_successful = 0; |
| 1158 | |
| 1159 | /* Validate that it's OK to call this routine */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1160 | if (! master_key_saved) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1161 | SLOGE("Encrypted filesystem not validated, aborting"); |
| 1162 | return -1; |
| 1163 | } |
| 1164 | |
| 1165 | if (restart_successful) { |
| 1166 | SLOGE("System already restarted with encrypted disk, aborting"); |
| 1167 | return -1; |
| 1168 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1169 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1170 | if (restart_main) { |
| 1171 | /* Here is where we shut down the framework. The init scripts |
| 1172 | * start all services in one of three classes: core, main or late_start. |
| 1173 | * On boot, we start core and main. Now, we stop main, but not core, |
| 1174 | * as core includes vold and a few other really important things that |
| 1175 | * we need to keep running. Once main has stopped, we should be able |
| 1176 | * to umount the tmpfs /data, then mount the encrypted /data. |
| 1177 | * We then restart the class main, and also the class late_start. |
| 1178 | * At the moment, I've only put a few things in late_start that I know |
| 1179 | * are not needed to bring up the framework, and that also cause problems |
| 1180 | * with unmounting the tmpfs /data, but I hope to add add more services |
| 1181 | * to the late_start class as we optimize this to decrease the delay |
| 1182 | * till the user is asked for the password to the filesystem. |
| 1183 | */ |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1184 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1185 | /* The init files are setup to stop the class main when vold.decrypt is |
| 1186 | * set to trigger_reset_main. |
| 1187 | */ |
| 1188 | property_set("vold.decrypt", "trigger_reset_main"); |
| 1189 | SLOGD("Just asked init to shut down class main\n"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1190 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1191 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 1192 | * can be fixed, this horrible hack will wait a moment for it all to |
| 1193 | * shut down before proceeding. Without it, some devices cannot |
| 1194 | * restart the graphics services. |
| 1195 | */ |
| 1196 | sleep(2); |
| 1197 | } |
Ken Sumrall | 9dedfd4 | 2012-10-09 14:16:59 -0700 | [diff] [blame] | 1198 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1199 | /* Now that the framework is shutdown, we should be able to umount() |
| 1200 | * the tmpfs filesystem, and mount the real one. |
| 1201 | */ |
| 1202 | |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1203 | property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); |
| 1204 | if (strlen(crypto_blkdev) == 0) { |
| 1205 | SLOGE("fs_crypto_blkdev not set\n"); |
| 1206 | return -1; |
| 1207 | } |
| 1208 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1209 | if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { |
Doug Zongker | 6fd5771 | 2013-12-17 09:43:23 -0800 | [diff] [blame] | 1210 | /* If ro.crypto.readonly is set to 1, mount the decrypted |
| 1211 | * filesystem readonly. This is used when /data is mounted by |
| 1212 | * recovery mode. |
| 1213 | */ |
| 1214 | char ro_prop[PROPERTY_VALUE_MAX]; |
| 1215 | property_get("ro.crypto.readonly", ro_prop, ""); |
| 1216 | if (strlen(ro_prop) > 0 && atoi(ro_prop)) { |
| 1217 | struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, DATA_MNT_POINT); |
| 1218 | rec->flags |= MS_RDONLY; |
| 1219 | } |
| 1220 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1221 | /* If that succeeded, then mount the decrypted filesystem */ |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1222 | fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, 0); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1223 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1224 | property_set("vold.decrypt", "trigger_load_persist_props"); |
| 1225 | /* Create necessary paths on /data */ |
| 1226 | if (prep_data_fs()) { |
| 1227 | return -1; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1228 | } |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1229 | |
| 1230 | /* startup service classes main and late_start */ |
| 1231 | property_set("vold.decrypt", "trigger_restart_framework"); |
| 1232 | SLOGD("Just triggered restart_framework\n"); |
| 1233 | |
| 1234 | /* Give it a few moments to get started */ |
| 1235 | sleep(1); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1236 | } |
| 1237 | |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1238 | if (rc == 0) { |
| 1239 | restart_successful = 1; |
| 1240 | } |
| 1241 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1242 | return rc; |
| 1243 | } |
| 1244 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1245 | int cryptfs_restart(void) |
| 1246 | { |
| 1247 | /* Call internal implementation forcing a restart of main service group */ |
| 1248 | return cryptfs_restart_internal(1); |
| 1249 | } |
| 1250 | |
Mark Salyzyn | 3e97127 | 2014-01-21 13:27:04 -0800 | [diff] [blame] | 1251 | static int do_crypto_complete(char *mount_point UNUSED) |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1252 | { |
| 1253 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1254 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | e1a4585 | 2011-12-14 21:24:27 -0800 | [diff] [blame] | 1255 | char key_loc[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1256 | |
| 1257 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1258 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1259 | SLOGE("not running with encryption, aborting"); |
| 1260 | return 1; |
| 1261 | } |
| 1262 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1263 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1264 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1265 | |
Ken Sumrall | e1a4585 | 2011-12-14 21:24:27 -0800 | [diff] [blame] | 1266 | /* |
| 1267 | * Only report this error if key_loc is a file and it exists. |
| 1268 | * If the device was never encrypted, and /data is not mountable for |
| 1269 | * some reason, returning 1 should prevent the UI from presenting the |
| 1270 | * a "enter password" screen, or worse, a "press button to wipe the |
| 1271 | * device" screen. |
| 1272 | */ |
| 1273 | if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) { |
| 1274 | SLOGE("master key file does not exist, aborting"); |
| 1275 | return 1; |
| 1276 | } else { |
| 1277 | SLOGE("Error getting crypt footer and key\n"); |
| 1278 | return -1; |
| 1279 | } |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1280 | } |
| 1281 | |
| 1282 | if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS) { |
| 1283 | SLOGE("Encryption process didn't finish successfully\n"); |
| 1284 | return -2; /* -2 is the clue to the UI that there is no usable data on the disk, |
| 1285 | * and give the user an option to wipe the disk */ |
| 1286 | } |
| 1287 | |
| 1288 | /* We passed the test! We shall diminish, and return to the west */ |
| 1289 | return 0; |
| 1290 | } |
| 1291 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1292 | static int test_mount_encrypted_fs(struct crypt_mnt_ftr* crypt_ftr, |
| 1293 | char *passwd, char *mount_point, char *label) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1294 | { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1295 | /* Allocate enough space for a 256 bit key, but we may use less */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1296 | unsigned char decrypted_master_key[32]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1297 | char crypto_blkdev[MAXPATHLEN]; |
| 1298 | char real_blkdev[MAXPATHLEN]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1299 | char tmp_mount_point[64]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1300 | unsigned int orig_failed_decrypt_count; |
| 1301 | int rc; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1302 | kdf_func kdf; |
| 1303 | void *kdf_params; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1304 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1305 | SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr->fs_size); |
| 1306 | orig_failed_decrypt_count = crypt_ftr->failed_decrypt_count; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1307 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1308 | if (! (crypt_ftr->flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { |
| 1309 | if (decrypt_master_key(passwd, decrypted_master_key, crypt_ftr)) { |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1310 | SLOGE("Failed to decrypt master key\n"); |
| 1311 | return -1; |
| 1312 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1313 | } |
| 1314 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1315 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
| 1316 | |
| 1317 | if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key, |
| 1318 | real_blkdev, crypto_blkdev, label)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1319 | SLOGE("Error creating decrypted block device\n"); |
| 1320 | return -1; |
| 1321 | } |
| 1322 | |
Alex Klyubin | 707795a | 2013-05-10 15:17:07 -0700 | [diff] [blame] | 1323 | /* If init detects an encrypted filesystem, it writes a file for each such |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1324 | * encrypted fs into the tmpfs /data filesystem, and then the framework finds those |
| 1325 | * files and passes that data to me */ |
| 1326 | /* Create a tmp mount point to try mounting the decryptd fs |
| 1327 | * Since we're here, the mount_point should be a tmpfs filesystem, so make |
| 1328 | * a directory in it to test mount the decrypted filesystem. |
| 1329 | */ |
| 1330 | sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); |
| 1331 | mkdir(tmp_mount_point, 0755); |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1332 | if (fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1333 | SLOGE("Error temp mounting decrypted block device\n"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1334 | delete_crypto_blk_dev(label); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1335 | crypt_ftr->failed_decrypt_count++; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1336 | } else { |
| 1337 | /* Success, so just umount and we'll mount it properly when we restart |
| 1338 | * the framework. |
| 1339 | */ |
| 1340 | umount(tmp_mount_point); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1341 | crypt_ftr->failed_decrypt_count = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1342 | } |
| 1343 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1344 | if (orig_failed_decrypt_count != crypt_ftr->failed_decrypt_count) { |
| 1345 | put_crypt_ftr_and_key(crypt_ftr); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1346 | } |
| 1347 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1348 | if (crypt_ftr->failed_decrypt_count) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1349 | /* We failed to mount the device, so return an error */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1350 | rc = crypt_ftr->failed_decrypt_count; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1351 | |
| 1352 | } else { |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1353 | /* Woot! Success! Save the name of the crypto block device |
| 1354 | * so we can mount it when restarting the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1355 | */ |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1356 | property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1357 | |
| 1358 | /* Also save a the master key so we can reencrypted the key |
| 1359 | * the key when we want to change the password on it. |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1360 | */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1361 | memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES); |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1362 | saved_mount_point = strdup(mount_point); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1363 | master_key_saved = 1; |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1364 | SLOGD("%s(): Master key saved\n", __FUNCTION__); |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1365 | rc = 0; |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1366 | /* |
| 1367 | * Upgrade if we're not using the latest KDF. |
| 1368 | */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1369 | if (crypt_ftr->kdf_type != KDF_SCRYPT) { |
| 1370 | crypt_ftr->kdf_type = KDF_SCRYPT; |
| 1371 | rc = encrypt_master_key(passwd, crypt_ftr->salt, saved_master_key, |
| 1372 | crypt_ftr->master_key, crypt_ftr); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1373 | if (!rc) { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1374 | rc = put_crypt_ftr_and_key(crypt_ftr); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1375 | } |
| 1376 | SLOGD("Key Derivation Function upgrade: rc=%d\n", rc); |
| 1377 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1378 | } |
| 1379 | |
| 1380 | return rc; |
| 1381 | } |
| 1382 | |
Ken Sumrall | 0b8b597 | 2011-08-31 16:14:23 -0700 | [diff] [blame] | 1383 | /* Called by vold when it wants to undo the crypto mapping of a volume it |
| 1384 | * manages. This is usually in response to a factory reset, when we want |
| 1385 | * to undo the crypto mapping so the volume is formatted in the clear. |
| 1386 | */ |
| 1387 | int cryptfs_revert_volume(const char *label) |
| 1388 | { |
| 1389 | return delete_crypto_blk_dev((char *)label); |
| 1390 | } |
| 1391 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1392 | /* |
| 1393 | * Called by vold when it's asked to mount an encrypted, nonremovable volume. |
| 1394 | * Setup a dm-crypt mapping, use the saved master key from |
| 1395 | * setting up the /data mapping, and return the new device path. |
| 1396 | */ |
| 1397 | int cryptfs_setup_volume(const char *label, int major, int minor, |
| 1398 | char *crypto_sys_path, unsigned int max_path, |
| 1399 | int *new_major, int *new_minor) |
| 1400 | { |
| 1401 | char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN]; |
| 1402 | struct crypt_mnt_ftr sd_crypt_ftr; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1403 | struct stat statbuf; |
| 1404 | int nr_sec, fd; |
| 1405 | |
| 1406 | sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor); |
| 1407 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1408 | get_crypt_ftr_and_key(&sd_crypt_ftr); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1409 | |
| 1410 | /* Update the fs_size field to be the size of the volume */ |
| 1411 | fd = open(real_blkdev, O_RDONLY); |
| 1412 | nr_sec = get_blkdev_size(fd); |
| 1413 | close(fd); |
| 1414 | if (nr_sec == 0) { |
| 1415 | SLOGE("Cannot get size of volume %s\n", real_blkdev); |
| 1416 | return -1; |
| 1417 | } |
| 1418 | |
| 1419 | sd_crypt_ftr.fs_size = nr_sec; |
| 1420 | create_crypto_blk_dev(&sd_crypt_ftr, saved_master_key, real_blkdev, |
| 1421 | crypto_blkdev, label); |
| 1422 | |
| 1423 | stat(crypto_blkdev, &statbuf); |
| 1424 | *new_major = MAJOR(statbuf.st_rdev); |
| 1425 | *new_minor = MINOR(statbuf.st_rdev); |
| 1426 | |
| 1427 | /* Create path to sys entry for this block device */ |
| 1428 | snprintf(crypto_sys_path, max_path, "/devices/virtual/block/%s", strrchr(crypto_blkdev, '/')+1); |
| 1429 | |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1433 | int cryptfs_crypto_complete(void) |
| 1434 | { |
| 1435 | return do_crypto_complete("/data"); |
| 1436 | } |
| 1437 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1438 | int check_unmounted_and_get_ftr(struct crypt_mnt_ftr* crypt_ftr) |
| 1439 | { |
| 1440 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1441 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1442 | if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { |
| 1443 | SLOGE("encrypted fs already validated or not running with encryption," |
| 1444 | " aborting"); |
| 1445 | return -1; |
| 1446 | } |
| 1447 | |
| 1448 | if (get_crypt_ftr_and_key(crypt_ftr)) { |
| 1449 | SLOGE("Error getting crypt footer and key"); |
| 1450 | return -1; |
| 1451 | } |
| 1452 | |
| 1453 | return 0; |
| 1454 | } |
| 1455 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1456 | int cryptfs_check_passwd(char *passwd) |
| 1457 | { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1458 | struct crypt_mnt_ftr crypt_ftr; |
| 1459 | int rc; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1460 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1461 | rc = check_unmounted_and_get_ftr(&crypt_ftr); |
| 1462 | if (rc) |
| 1463 | return rc; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1464 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1465 | rc = test_mount_encrypted_fs(&crypt_ftr, passwd, |
| 1466 | DATA_MNT_POINT, "userdata"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1467 | return rc; |
| 1468 | } |
| 1469 | |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1470 | int cryptfs_verify_passwd(char *passwd) |
| 1471 | { |
| 1472 | struct crypt_mnt_ftr crypt_ftr; |
| 1473 | /* Allocate enough space for a 256 bit key, but we may use less */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1474 | unsigned char decrypted_master_key[32]; |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1475 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1476 | int rc; |
| 1477 | |
| 1478 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1479 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1480 | SLOGE("device not encrypted, aborting"); |
| 1481 | return -2; |
| 1482 | } |
| 1483 | |
| 1484 | if (!master_key_saved) { |
| 1485 | SLOGE("encrypted fs not yet mounted, aborting"); |
| 1486 | return -1; |
| 1487 | } |
| 1488 | |
| 1489 | if (!saved_mount_point) { |
| 1490 | SLOGE("encrypted fs failed to save mount point, aborting"); |
| 1491 | return -1; |
| 1492 | } |
| 1493 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1494 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1495 | SLOGE("Error getting crypt footer and key\n"); |
| 1496 | return -1; |
| 1497 | } |
| 1498 | |
| 1499 | if (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) { |
| 1500 | /* If the device has no password, then just say the password is valid */ |
| 1501 | rc = 0; |
| 1502 | } else { |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1503 | decrypt_master_key(passwd, decrypted_master_key, &crypt_ftr); |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1504 | if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) { |
| 1505 | /* They match, the password is correct */ |
| 1506 | rc = 0; |
| 1507 | } else { |
| 1508 | /* If incorrect, sleep for a bit to prevent dictionary attacks */ |
| 1509 | sleep(1); |
| 1510 | rc = 1; |
| 1511 | } |
| 1512 | } |
| 1513 | |
| 1514 | return rc; |
| 1515 | } |
| 1516 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1517 | /* Initialize a crypt_mnt_ftr structure. The keysize is |
| 1518 | * defaulted to 16 bytes, and the filesystem size to 0. |
| 1519 | * Presumably, at a minimum, the caller will update the |
| 1520 | * filesystem size and crypto_type_name after calling this function. |
| 1521 | */ |
| 1522 | static void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) |
| 1523 | { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1524 | off64_t off; |
| 1525 | |
| 1526 | memset(ftr, 0, sizeof(struct crypt_mnt_ftr)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1527 | ftr->magic = CRYPT_MNT_MAGIC; |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 1528 | ftr->major_version = CURRENT_MAJOR_VERSION; |
| 1529 | ftr->minor_version = CURRENT_MINOR_VERSION; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1530 | ftr->ftr_size = sizeof(struct crypt_mnt_ftr); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1531 | ftr->keysize = KEY_LEN_BYTES; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1532 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1533 | ftr->kdf_type = KDF_SCRYPT; |
| 1534 | get_device_scrypt_params(ftr); |
| 1535 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1536 | ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 1537 | if (get_crypt_ftr_info(NULL, &off) == 0) { |
| 1538 | ftr->persist_data_offset[0] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
| 1539 | ftr->persist_data_offset[1] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET + |
| 1540 | ftr->persist_data_size; |
| 1541 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1542 | } |
| 1543 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1544 | static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1545 | { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1546 | const char *args[10]; |
| 1547 | char size_str[32]; /* Must be large enough to hold a %lld and null byte */ |
| 1548 | int num_args; |
| 1549 | int status; |
| 1550 | int tmp; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1551 | int rc = -1; |
| 1552 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1553 | if (type == EXT4_FS) { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1554 | args[0] = "/system/bin/make_ext4fs"; |
| 1555 | args[1] = "-a"; |
| 1556 | args[2] = "/data"; |
| 1557 | args[3] = "-l"; |
| 1558 | snprintf(size_str, sizeof(size_str), "%lld", size * 512); |
| 1559 | args[4] = size_str; |
| 1560 | args[5] = crypto_blkdev; |
| 1561 | num_args = 6; |
| 1562 | SLOGI("Making empty filesystem with command %s %s %s %s %s %s\n", |
| 1563 | args[0], args[1], args[2], args[3], args[4], args[5]); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1564 | } else if (type== FAT_FS) { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1565 | args[0] = "/system/bin/newfs_msdos"; |
| 1566 | args[1] = "-F"; |
| 1567 | args[2] = "32"; |
| 1568 | args[3] = "-O"; |
| 1569 | args[4] = "android"; |
| 1570 | args[5] = "-c"; |
| 1571 | args[6] = "8"; |
| 1572 | args[7] = "-s"; |
| 1573 | snprintf(size_str, sizeof(size_str), "%lld", size); |
| 1574 | args[8] = size_str; |
| 1575 | args[9] = crypto_blkdev; |
| 1576 | num_args = 10; |
| 1577 | SLOGI("Making empty filesystem with command %s %s %s %s %s %s %s %s %s %s\n", |
| 1578 | args[0], args[1], args[2], args[3], args[4], args[5], |
| 1579 | args[6], args[7], args[8], args[9]); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1580 | } else { |
| 1581 | SLOGE("cryptfs_enable_wipe(): unknown filesystem type %d\n", type); |
| 1582 | return -1; |
| 1583 | } |
| 1584 | |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1585 | tmp = android_fork_execvp(num_args, (char **)args, &status, false, true); |
| 1586 | |
| 1587 | if (tmp != 0) { |
| 1588 | SLOGE("Error creating empty filesystem on %s due to logwrap error\n", crypto_blkdev); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1589 | } else { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1590 | if (WIFEXITED(status)) { |
| 1591 | if (WEXITSTATUS(status)) { |
| 1592 | SLOGE("Error creating filesystem on %s, exit status %d ", |
| 1593 | crypto_blkdev, WEXITSTATUS(status)); |
| 1594 | } else { |
| 1595 | SLOGD("Successfully created filesystem on %s\n", crypto_blkdev); |
| 1596 | rc = 0; |
| 1597 | } |
| 1598 | } else { |
| 1599 | SLOGE("Error creating filesystem on %s, did not exit normally\n", crypto_blkdev); |
| 1600 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1601 | } |
| 1602 | |
| 1603 | return rc; |
| 1604 | } |
| 1605 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1606 | #define CRYPT_INPLACE_BUFSIZE 4096 |
| 1607 | #define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1608 | |
| 1609 | /* aligned 32K writes tends to make flash happy. |
| 1610 | * SD card association recommends it. |
| 1611 | */ |
| 1612 | #define BLOCKS_AT_A_TIME 8 |
| 1613 | |
| 1614 | struct encryptGroupsData |
| 1615 | { |
| 1616 | int realfd; |
| 1617 | int cryptofd; |
| 1618 | off64_t numblocks; |
| 1619 | off64_t one_pct, cur_pct, new_pct; |
| 1620 | off64_t blocks_already_done, tot_numblocks; |
| 1621 | char* real_blkdev, * crypto_blkdev; |
| 1622 | int count; |
| 1623 | off64_t offset; |
| 1624 | char* buffer; |
| 1625 | }; |
| 1626 | |
| 1627 | static void update_progress(struct encryptGroupsData* data) |
| 1628 | { |
| 1629 | data->blocks_already_done++; |
| 1630 | data->new_pct = data->blocks_already_done / data->one_pct; |
| 1631 | if (data->new_pct > data->cur_pct) { |
| 1632 | char buf[8]; |
| 1633 | data->cur_pct = data->new_pct; |
| 1634 | snprintf(buf, sizeof(buf), "%lld", data->cur_pct); |
| 1635 | property_set("vold.encrypt_progress", buf); |
| 1636 | } |
| 1637 | } |
| 1638 | |
| 1639 | static int flush_outstanding_data(struct encryptGroupsData* data) |
| 1640 | { |
| 1641 | if (data->count == 0) { |
| 1642 | return 0; |
| 1643 | } |
| 1644 | |
| 1645 | SLOGV("Copying %d blocks at offset %llx", data->count, data->offset); |
| 1646 | |
| 1647 | if (pread64(data->realfd, data->buffer, |
| 1648 | info.block_size * data->count, data->offset) |
| 1649 | <= 0) { |
| 1650 | SLOGE("Error reading real_blkdev %s for inplace encrypt", |
| 1651 | data->real_blkdev); |
| 1652 | return -1; |
| 1653 | } |
| 1654 | |
| 1655 | if (pwrite64(data->cryptofd, data->buffer, |
| 1656 | info.block_size * data->count, data->offset) |
| 1657 | <= 0) { |
| 1658 | SLOGE("Error writing crypto_blkdev %s for inplace encrypt", |
| 1659 | data->crypto_blkdev); |
| 1660 | return -1; |
| 1661 | } |
| 1662 | |
| 1663 | data->count = 0; |
| 1664 | return 0; |
| 1665 | } |
| 1666 | |
| 1667 | static int encrypt_groups(struct encryptGroupsData* data) |
| 1668 | { |
| 1669 | unsigned int i; |
| 1670 | u8 *block_bitmap = 0; |
| 1671 | unsigned int block; |
| 1672 | off64_t ret; |
| 1673 | int rc = -1; |
| 1674 | |
| 1675 | data->buffer = malloc(info.block_size * BLOCKS_AT_A_TIME); |
| 1676 | if (!data->buffer) { |
| 1677 | SLOGE("Failed to allocate crypto buffer"); |
| 1678 | goto errout; |
| 1679 | } |
| 1680 | |
| 1681 | block_bitmap = malloc(info.block_size); |
| 1682 | if (!block_bitmap) { |
| 1683 | SLOGE("failed to allocate block bitmap"); |
| 1684 | goto errout; |
| 1685 | } |
| 1686 | |
| 1687 | for (i = 0; i < aux_info.groups; ++i) { |
| 1688 | SLOGI("Encrypting group %d", i); |
| 1689 | |
| 1690 | u32 first_block = aux_info.first_data_block + i * info.blocks_per_group; |
| 1691 | u32 block_count = min(info.blocks_per_group, |
| 1692 | aux_info.len_blocks - first_block); |
| 1693 | |
| 1694 | off64_t offset = (u64)info.block_size |
| 1695 | * aux_info.bg_desc[i].bg_block_bitmap; |
| 1696 | |
| 1697 | ret = pread64(data->realfd, block_bitmap, info.block_size, offset); |
| 1698 | if (ret != (int)info.block_size) { |
| 1699 | SLOGE("failed to read all of block group bitmap %d", i); |
| 1700 | goto errout; |
| 1701 | } |
| 1702 | |
| 1703 | offset = (u64)info.block_size * first_block; |
| 1704 | |
| 1705 | data->count = 0; |
| 1706 | |
| 1707 | for (block = 0; block < block_count; block++) { |
| 1708 | update_progress(data); |
| 1709 | if (bitmap_get_bit(block_bitmap, block)) { |
| 1710 | if (data->count == 0) { |
| 1711 | data->offset = offset; |
| 1712 | } |
| 1713 | data->count++; |
| 1714 | } else { |
| 1715 | if (flush_outstanding_data(data)) { |
| 1716 | goto errout; |
| 1717 | } |
| 1718 | } |
| 1719 | |
| 1720 | offset += info.block_size; |
| 1721 | |
| 1722 | /* Write data if we are aligned or buffer size reached */ |
| 1723 | if (offset % (info.block_size * BLOCKS_AT_A_TIME) == 0 |
| 1724 | || data->count == BLOCKS_AT_A_TIME) { |
| 1725 | if (flush_outstanding_data(data)) { |
| 1726 | goto errout; |
| 1727 | } |
| 1728 | } |
| 1729 | } |
| 1730 | if (flush_outstanding_data(data)) { |
| 1731 | goto errout; |
| 1732 | } |
| 1733 | } |
| 1734 | |
| 1735 | rc = 0; |
| 1736 | |
| 1737 | errout: |
| 1738 | free(data->buffer); |
| 1739 | free(block_bitmap); |
| 1740 | return rc; |
| 1741 | } |
| 1742 | |
| 1743 | static int cryptfs_enable_inplace_ext4(char *crypto_blkdev, |
| 1744 | char *real_blkdev, |
| 1745 | off64_t size, |
| 1746 | off64_t *size_already_done, |
| 1747 | off64_t tot_size) |
| 1748 | { |
| 1749 | int i; |
| 1750 | struct encryptGroupsData data; |
| 1751 | int rc = -1; |
| 1752 | |
| 1753 | memset(&data, 0, sizeof(data)); |
| 1754 | data.real_blkdev = real_blkdev; |
| 1755 | data.crypto_blkdev = crypto_blkdev; |
| 1756 | |
| 1757 | if ( (data.realfd = open(real_blkdev, O_RDWR)) < 0) { |
| 1758 | SLOGE("Error opening real_blkdev %s for inplace encrypt\n", |
| 1759 | real_blkdev); |
| 1760 | goto errout; |
| 1761 | } |
| 1762 | |
| 1763 | if ( (data.cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 1764 | SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", |
| 1765 | crypto_blkdev); |
| 1766 | goto errout; |
| 1767 | } |
| 1768 | |
| 1769 | if (setjmp(setjmp_env)) { |
| 1770 | SLOGE("Reading extent caused an exception"); |
| 1771 | goto errout; |
| 1772 | } |
| 1773 | |
| 1774 | if (read_ext(data.realfd, 0) != 0) { |
| 1775 | SLOGE("Failed to read extent"); |
| 1776 | goto errout; |
| 1777 | } |
| 1778 | |
| 1779 | data.numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 1780 | data.tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 1781 | data.blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
| 1782 | |
| 1783 | SLOGI("Encrypting filesystem in place..."); |
| 1784 | |
| 1785 | data.one_pct = data.tot_numblocks / 100; |
| 1786 | data.cur_pct = 0; |
| 1787 | |
| 1788 | rc = encrypt_groups(&data); |
| 1789 | if (rc) { |
| 1790 | SLOGE("Error encrypting groups"); |
| 1791 | goto errout; |
| 1792 | } |
| 1793 | |
| 1794 | *size_already_done += size; |
| 1795 | rc = 0; |
| 1796 | |
| 1797 | errout: |
| 1798 | close(data.realfd); |
| 1799 | close(data.cryptofd); |
| 1800 | |
| 1801 | return rc; |
| 1802 | } |
| 1803 | |
| 1804 | static int cryptfs_enable_inplace_full(char *crypto_blkdev, char *real_blkdev, |
| 1805 | off64_t size, off64_t *size_already_done, |
| 1806 | off64_t tot_size) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1807 | { |
| 1808 | int realfd, cryptofd; |
| 1809 | char *buf[CRYPT_INPLACE_BUFSIZE]; |
| 1810 | int rc = -1; |
| 1811 | off64_t numblocks, i, remainder; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1812 | off64_t one_pct, cur_pct, new_pct; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1813 | off64_t blocks_already_done, tot_numblocks; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1814 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1815 | if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { |
| 1816 | SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); |
| 1817 | return -1; |
| 1818 | } |
| 1819 | |
| 1820 | if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 1821 | SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1822 | close(realfd); |
| 1823 | return -1; |
| 1824 | } |
| 1825 | |
| 1826 | /* This is pretty much a simple loop of reading 4K, and writing 4K. |
| 1827 | * The size passed in is the number of 512 byte sectors in the filesystem. |
| 1828 | * So compute the number of whole 4K blocks we should read/write, |
| 1829 | * and the remainder. |
| 1830 | */ |
| 1831 | numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 1832 | remainder = size % CRYPT_SECTORS_PER_BUFSIZE; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1833 | tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 1834 | blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1835 | |
| 1836 | SLOGE("Encrypting filesystem in place..."); |
| 1837 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1838 | one_pct = tot_numblocks / 100; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1839 | cur_pct = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1840 | /* process the majority of the filesystem in blocks */ |
| 1841 | for (i=0; i<numblocks; i++) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1842 | new_pct = (i + blocks_already_done) / one_pct; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1843 | if (new_pct > cur_pct) { |
| 1844 | char buf[8]; |
| 1845 | |
| 1846 | cur_pct = new_pct; |
| 1847 | snprintf(buf, sizeof(buf), "%lld", cur_pct); |
| 1848 | property_set("vold.encrypt_progress", buf); |
| 1849 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1850 | if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { |
| 1851 | SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1852 | goto errout; |
| 1853 | } |
| 1854 | if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { |
| 1855 | SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1856 | goto errout; |
| 1857 | } |
| 1858 | } |
| 1859 | |
| 1860 | /* Do any remaining sectors */ |
| 1861 | for (i=0; i<remainder; i++) { |
| 1862 | if (unix_read(realfd, buf, 512) <= 0) { |
| 1863 | SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1864 | goto errout; |
| 1865 | } |
| 1866 | if (unix_write(cryptofd, buf, 512) <= 0) { |
| 1867 | SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1868 | goto errout; |
| 1869 | } |
| 1870 | } |
| 1871 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1872 | *size_already_done += size; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1873 | rc = 0; |
| 1874 | |
| 1875 | errout: |
| 1876 | close(realfd); |
| 1877 | close(cryptofd); |
| 1878 | |
| 1879 | return rc; |
| 1880 | } |
| 1881 | |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1882 | static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, |
| 1883 | off64_t size, off64_t *size_already_done, |
| 1884 | off64_t tot_size) |
| 1885 | { |
| 1886 | if (cryptfs_enable_inplace_ext4(crypto_blkdev, real_blkdev, |
| 1887 | size, size_already_done, tot_size) == 0) { |
| 1888 | return 0; |
| 1889 | } |
| 1890 | |
| 1891 | return cryptfs_enable_inplace_full(crypto_blkdev, real_blkdev, |
| 1892 | size, size_already_done, tot_size); |
| 1893 | } |
| 1894 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1895 | #define CRYPTO_ENABLE_WIPE 1 |
| 1896 | #define CRYPTO_ENABLE_INPLACE 2 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1897 | |
| 1898 | #define FRAMEWORK_BOOT_WAIT 60 |
| 1899 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1900 | static inline int should_encrypt(struct volume_info *volume) |
| 1901 | { |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1902 | return (volume->flags & (VOL_ENCRYPTABLE | VOL_NONREMOVABLE)) == |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1903 | (VOL_ENCRYPTABLE | VOL_NONREMOVABLE); |
| 1904 | } |
| 1905 | |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame^] | 1906 | int cryptfs_enable_internal(char *howarg, int crypt_type, char *passwd, |
| 1907 | int allow_reboot) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1908 | { |
| 1909 | int how = 0; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1910 | char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN], sd_crypto_blkdev[MAXPATHLEN]; |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1911 | unsigned long nr_sec; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1912 | unsigned char decrypted_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 319b104 | 2011-06-14 14:01:55 -0700 | [diff] [blame] | 1913 | int rc=-1, fd, i, ret; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1914 | struct crypt_mnt_ftr crypt_ftr, sd_crypt_ftr;; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1915 | struct crypt_persist_data *pdata; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1916 | char tmpfs_options[PROPERTY_VALUE_MAX]; |
| 1917 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1918 | char lockid[32] = { 0 }; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1919 | char key_loc[PROPERTY_VALUE_MAX]; |
| 1920 | char fuse_sdcard[PROPERTY_VALUE_MAX]; |
| 1921 | char *sd_mnt_point; |
| 1922 | char sd_blk_dev[256] = { 0 }; |
| 1923 | int num_vols; |
| 1924 | struct volume_info *vol_list = 0; |
| 1925 | off64_t cur_encryption_done=0, tot_encryption_size=0; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1926 | |
| 1927 | property_get("ro.crypto.state", encrypted_state, ""); |
JP Abgrall | 502dc74 | 2013-11-01 13:06:20 -0700 | [diff] [blame] | 1928 | if (!strcmp(encrypted_state, "encrypted")) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1929 | SLOGE("Device is already running encrypted, aborting"); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1930 | goto error_unencrypted; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1931 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1932 | |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1933 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1934 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1935 | if (!strcmp(howarg, "wipe")) { |
| 1936 | how = CRYPTO_ENABLE_WIPE; |
| 1937 | } else if (! strcmp(howarg, "inplace")) { |
| 1938 | how = CRYPTO_ENABLE_INPLACE; |
| 1939 | } else { |
| 1940 | /* Shouldn't happen, as CommandListener vets the args */ |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1941 | goto error_unencrypted; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1942 | } |
| 1943 | |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1944 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1945 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1946 | /* Get the size of the real block device */ |
| 1947 | fd = open(real_blkdev, O_RDONLY); |
| 1948 | if ( (nr_sec = get_blkdev_size(fd)) == 0) { |
| 1949 | SLOGE("Cannot get size of block device %s\n", real_blkdev); |
| 1950 | goto error_unencrypted; |
| 1951 | } |
| 1952 | close(fd); |
| 1953 | |
| 1954 | /* If doing inplace encryption, make sure the orig fs doesn't include the crypto footer */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1955 | if ((how == CRYPTO_ENABLE_INPLACE) && (!strcmp(key_loc, KEY_IN_FOOTER))) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1956 | unsigned int fs_size_sec, max_fs_size_sec; |
| 1957 | |
| 1958 | fs_size_sec = get_fs_size(real_blkdev); |
| 1959 | max_fs_size_sec = nr_sec - (CRYPT_FOOTER_OFFSET / 512); |
| 1960 | |
| 1961 | if (fs_size_sec > max_fs_size_sec) { |
| 1962 | SLOGE("Orig filesystem overlaps crypto footer region. Cannot encrypt in place."); |
| 1963 | goto error_unencrypted; |
| 1964 | } |
| 1965 | } |
| 1966 | |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1967 | /* Get a wakelock as this may take a while, and we don't want the |
| 1968 | * device to sleep on us. We'll grab a partial wakelock, and if the UI |
| 1969 | * wants to keep the screen on, it can grab a full wakelock. |
| 1970 | */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1971 | snprintf(lockid, sizeof(lockid), "enablecrypto%d", (int) getpid()); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1972 | acquire_wake_lock(PARTIAL_WAKE_LOCK, lockid); |
| 1973 | |
Jeff Sharkey | 7382f81 | 2012-08-23 14:08:59 -0700 | [diff] [blame] | 1974 | /* Get the sdcard mount point */ |
Jeff Sharkey | b77bc46 | 2012-10-01 14:36:26 -0700 | [diff] [blame] | 1975 | sd_mnt_point = getenv("EMULATED_STORAGE_SOURCE"); |
Jeff Sharkey | 7382f81 | 2012-08-23 14:08:59 -0700 | [diff] [blame] | 1976 | if (!sd_mnt_point) { |
| 1977 | sd_mnt_point = getenv("EXTERNAL_STORAGE"); |
| 1978 | } |
| 1979 | if (!sd_mnt_point) { |
| 1980 | sd_mnt_point = "/mnt/sdcard"; |
| 1981 | } |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1982 | |
| 1983 | num_vols=vold_getNumDirectVolumes(); |
| 1984 | vol_list = malloc(sizeof(struct volume_info) * num_vols); |
| 1985 | vold_getDirectVolumeList(vol_list); |
| 1986 | |
| 1987 | for (i=0; i<num_vols; i++) { |
| 1988 | if (should_encrypt(&vol_list[i])) { |
| 1989 | fd = open(vol_list[i].blk_dev, O_RDONLY); |
| 1990 | if ( (vol_list[i].size = get_blkdev_size(fd)) == 0) { |
| 1991 | SLOGE("Cannot get size of block device %s\n", vol_list[i].blk_dev); |
| 1992 | goto error_unencrypted; |
| 1993 | } |
| 1994 | close(fd); |
| 1995 | |
Ken Sumrall | 3b17005 | 2011-07-11 15:38:57 -0700 | [diff] [blame] | 1996 | ret=vold_disableVol(vol_list[i].label); |
Ken Sumrall | 319b104 | 2011-06-14 14:01:55 -0700 | [diff] [blame] | 1997 | if ((ret < 0) && (ret != UNMOUNT_NOT_MOUNTED_ERR)) { |
| 1998 | /* -2 is returned when the device exists but is not currently mounted. |
| 1999 | * ignore the error and continue. */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2000 | SLOGE("Failed to unmount volume %s\n", vol_list[i].label); |
| 2001 | goto error_unencrypted; |
| 2002 | } |
| 2003 | } |
| 2004 | } |
| 2005 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2006 | /* The init files are setup to stop the class main and late start when |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2007 | * vold sets trigger_shutdown_framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2008 | */ |
| 2009 | property_set("vold.decrypt", "trigger_shutdown_framework"); |
| 2010 | SLOGD("Just asked init to shut down class main\n"); |
| 2011 | |
Ken Sumrall | 425524d | 2012-06-14 20:55:28 -0700 | [diff] [blame] | 2012 | if (vold_unmountAllAsecs()) { |
| 2013 | /* Just report the error. If any are left mounted, |
| 2014 | * umounting /data below will fail and handle the error. |
| 2015 | */ |
| 2016 | SLOGE("Error unmounting internal asecs"); |
| 2017 | } |
| 2018 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2019 | property_get("ro.crypto.fuse_sdcard", fuse_sdcard, ""); |
| 2020 | if (!strcmp(fuse_sdcard, "true")) { |
| 2021 | /* This is a device using the fuse layer to emulate the sdcard semantics |
| 2022 | * on top of the userdata partition. vold does not manage it, it is managed |
| 2023 | * by the sdcard service. The sdcard service was killed by the property trigger |
| 2024 | * above, so just unmount it now. We must do this _AFTER_ killing the framework, |
| 2025 | * unlike the case for vold managed devices above. |
| 2026 | */ |
| 2027 | if (wait_and_unmount(sd_mnt_point)) { |
| 2028 | goto error_shutting_down; |
| 2029 | } |
Ken Sumrall | 2eaf713 | 2011-01-14 12:45:48 -0800 | [diff] [blame] | 2030 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2031 | |
| 2032 | /* Now unmount the /data partition. */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2033 | if (wait_and_unmount(DATA_MNT_POINT)) { |
JP Abgrall | 502dc74 | 2013-11-01 13:06:20 -0700 | [diff] [blame] | 2034 | if (allow_reboot) { |
| 2035 | goto error_shutting_down; |
| 2036 | } else { |
| 2037 | goto error_unencrypted; |
| 2038 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2039 | } |
| 2040 | |
| 2041 | /* Do extra work for a better UX when doing the long inplace encryption */ |
| 2042 | if (how == CRYPTO_ENABLE_INPLACE) { |
| 2043 | /* Now that /data is unmounted, we need to mount a tmpfs |
| 2044 | * /data, set a property saying we're doing inplace encryption, |
| 2045 | * and restart the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2046 | */ |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 2047 | if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2048 | goto error_shutting_down; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2049 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2050 | /* Tells the framework that inplace encryption is starting */ |
Ken Sumrall | 7df8412 | 2011-01-18 14:04:08 -0800 | [diff] [blame] | 2051 | property_set("vold.encrypt_progress", "0"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2052 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2053 | /* restart the framework. */ |
| 2054 | /* Create necessary paths on /data */ |
| 2055 | if (prep_data_fs()) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2056 | goto error_shutting_down; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2057 | } |
| 2058 | |
Ken Sumrall | 92736ef | 2012-10-17 20:57:14 -0700 | [diff] [blame] | 2059 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 2060 | * can be fixed, this horrible hack will wait a moment for it all to |
| 2061 | * shut down before proceeding. Without it, some devices cannot |
| 2062 | * restart the graphics services. |
| 2063 | */ |
| 2064 | sleep(2); |
| 2065 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2066 | /* startup service classes main and late_start */ |
| 2067 | property_set("vold.decrypt", "trigger_restart_min_framework"); |
| 2068 | SLOGD("Just triggered restart_min_framework\n"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2069 | |
Ken Sumrall | 7df8412 | 2011-01-18 14:04:08 -0800 | [diff] [blame] | 2070 | /* OK, the framework is restarted and will soon be showing a |
| 2071 | * progress bar. Time to setup an encrypted mapping, and |
| 2072 | * either write a new filesystem, or encrypt in place updating |
| 2073 | * the progress bar as we work. |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2074 | */ |
| 2075 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2076 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2077 | /* Start the actual work of making an encrypted filesystem */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2078 | /* Initialize a crypt_mnt_ftr for the partition */ |
| 2079 | cryptfs_init_crypt_mnt_ftr(&crypt_ftr); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2080 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2081 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 2082 | crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512); |
| 2083 | } else { |
| 2084 | crypt_ftr.fs_size = nr_sec; |
| 2085 | } |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 2086 | crypt_ftr.flags |= CRYPT_ENCRYPTION_IN_PROGRESS; |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame^] | 2087 | crypt_ftr.crypt_type = crypt_type; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2088 | strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); |
| 2089 | |
| 2090 | /* Make an encrypted master key */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 2091 | if (create_encrypted_random_key(passwd, crypt_ftr.master_key, crypt_ftr.salt, &crypt_ftr)) { |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2092 | SLOGE("Cannot create encrypted master key\n"); |
JP Abgrall | 502dc74 | 2013-11-01 13:06:20 -0700 | [diff] [blame] | 2093 | goto error_shutting_down; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2094 | } |
| 2095 | |
| 2096 | /* Write the key to the end of the partition */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2097 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2098 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2099 | /* If any persistent data has been remembered, save it. |
| 2100 | * If none, create a valid empty table and save that. |
| 2101 | */ |
| 2102 | if (!persist_data) { |
| 2103 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 2104 | if (pdata) { |
| 2105 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 2106 | persist_data = pdata; |
| 2107 | } |
| 2108 | } |
| 2109 | if (persist_data) { |
| 2110 | save_persistent_data(); |
| 2111 | } |
| 2112 | |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 2113 | decrypt_master_key(passwd, decrypted_master_key, &crypt_ftr); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2114 | create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev, |
| 2115 | "userdata"); |
| 2116 | |
Ken Sumrall | 128626f | 2011-06-28 18:45:14 -0700 | [diff] [blame] | 2117 | /* The size of the userdata partition, and add in the vold volumes below */ |
| 2118 | tot_encryption_size = crypt_ftr.fs_size; |
| 2119 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2120 | /* setup crypto mapping for all encryptable volumes handled by vold */ |
| 2121 | for (i=0; i<num_vols; i++) { |
| 2122 | if (should_encrypt(&vol_list[i])) { |
| 2123 | vol_list[i].crypt_ftr = crypt_ftr; /* gotta love struct assign */ |
| 2124 | vol_list[i].crypt_ftr.fs_size = vol_list[i].size; |
| 2125 | create_crypto_blk_dev(&vol_list[i].crypt_ftr, decrypted_master_key, |
| 2126 | vol_list[i].blk_dev, vol_list[i].crypto_blkdev, |
| 2127 | vol_list[i].label); |
Ken Sumrall | 128626f | 2011-06-28 18:45:14 -0700 | [diff] [blame] | 2128 | tot_encryption_size += vol_list[i].size; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2129 | } |
| 2130 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2131 | |
| 2132 | if (how == CRYPTO_ENABLE_WIPE) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2133 | rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size, EXT4_FS); |
| 2134 | /* Encrypt all encryptable volumes handled by vold */ |
| 2135 | if (!rc) { |
| 2136 | for (i=0; i<num_vols; i++) { |
| 2137 | if (should_encrypt(&vol_list[i])) { |
| 2138 | rc = cryptfs_enable_wipe(vol_list[i].crypto_blkdev, |
| 2139 | vol_list[i].crypt_ftr.fs_size, FAT_FS); |
| 2140 | } |
| 2141 | } |
| 2142 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2143 | } else if (how == CRYPTO_ENABLE_INPLACE) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2144 | rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size, |
| 2145 | &cur_encryption_done, tot_encryption_size); |
| 2146 | /* Encrypt all encryptable volumes handled by vold */ |
| 2147 | if (!rc) { |
| 2148 | for (i=0; i<num_vols; i++) { |
| 2149 | if (should_encrypt(&vol_list[i])) { |
| 2150 | rc = cryptfs_enable_inplace(vol_list[i].crypto_blkdev, |
| 2151 | vol_list[i].blk_dev, |
| 2152 | vol_list[i].crypt_ftr.fs_size, |
| 2153 | &cur_encryption_done, tot_encryption_size); |
| 2154 | } |
| 2155 | } |
| 2156 | } |
| 2157 | if (!rc) { |
| 2158 | /* The inplace routine never actually sets the progress to 100% |
| 2159 | * due to the round down nature of integer division, so set it here */ |
| 2160 | property_set("vold.encrypt_progress", "100"); |
| 2161 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2162 | } else { |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2163 | /* Shouldn't happen */ |
| 2164 | SLOGE("cryptfs_enable: internal error, unknown option\n"); |
JP Abgrall | 502dc74 | 2013-11-01 13:06:20 -0700 | [diff] [blame] | 2165 | goto error_shutting_down; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2166 | } |
| 2167 | |
| 2168 | /* Undo the dm-crypt mapping whether we succeed or not */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2169 | delete_crypto_blk_dev("userdata"); |
| 2170 | for (i=0; i<num_vols; i++) { |
| 2171 | if (should_encrypt(&vol_list[i])) { |
| 2172 | delete_crypto_blk_dev(vol_list[i].label); |
| 2173 | } |
| 2174 | } |
| 2175 | |
| 2176 | free(vol_list); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2177 | |
| 2178 | if (! rc) { |
| 2179 | /* Success */ |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 2180 | |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 2181 | /* Clear the encryption in progres flag in the footer */ |
| 2182 | crypt_ftr.flags &= ~CRYPT_ENCRYPTION_IN_PROGRESS; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2183 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 2184 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2185 | sleep(2); /* Give the UI a chance to show 100% progress */ |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 2186 | cryptfs_reboot(0); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2187 | } else { |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2188 | char value[PROPERTY_VALUE_MAX]; |
| 2189 | |
Ken Sumrall | 319369a | 2012-06-27 16:30:18 -0700 | [diff] [blame] | 2190 | property_get("ro.vold.wipe_on_crypt_fail", value, "0"); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2191 | if (!strcmp(value, "1")) { |
| 2192 | /* wipe data if encryption failed */ |
| 2193 | SLOGE("encryption failed - rebooting into recovery to wipe data\n"); |
| 2194 | mkdir("/cache/recovery", 0700); |
Nick Kralevich | 4684e58 | 2012-06-26 15:07:03 -0700 | [diff] [blame] | 2195 | int fd = open("/cache/recovery/command", O_RDWR|O_CREAT|O_TRUNC, 0600); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2196 | if (fd >= 0) { |
| 2197 | write(fd, "--wipe_data", strlen("--wipe_data") + 1); |
| 2198 | close(fd); |
| 2199 | } else { |
| 2200 | SLOGE("could not open /cache/recovery/command\n"); |
| 2201 | } |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 2202 | cryptfs_reboot(1); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2203 | } else { |
| 2204 | /* set property to trigger dialog */ |
| 2205 | property_set("vold.encrypt_progress", "error_partially_encrypted"); |
| 2206 | release_wake_lock(lockid); |
| 2207 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2208 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2209 | } |
| 2210 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2211 | /* hrm, the encrypt step claims success, but the reboot failed. |
| 2212 | * This should not happen. |
| 2213 | * Set the property and return. Hope the framework can deal with it. |
| 2214 | */ |
| 2215 | property_set("vold.encrypt_progress", "error_reboot_failed"); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2216 | release_wake_lock(lockid); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2217 | return rc; |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2218 | |
| 2219 | error_unencrypted: |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2220 | free(vol_list); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2221 | property_set("vold.encrypt_progress", "error_not_encrypted"); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2222 | if (lockid[0]) { |
| 2223 | release_wake_lock(lockid); |
| 2224 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2225 | return -1; |
| 2226 | |
| 2227 | error_shutting_down: |
| 2228 | /* we failed, and have not encrypted anthing, so the users's data is still intact, |
| 2229 | * but the framework is stopped and not restarted to show the error, so it's up to |
| 2230 | * vold to restart the system. |
| 2231 | */ |
| 2232 | SLOGE("Error enabling encryption after framework is shutdown, no data changed, restarting system"); |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 2233 | cryptfs_reboot(0); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2234 | |
| 2235 | /* shouldn't get here */ |
| 2236 | property_set("vold.encrypt_progress", "error_shutting_down"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2237 | free(vol_list); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2238 | if (lockid[0]) { |
| 2239 | release_wake_lock(lockid); |
| 2240 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2241 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2242 | } |
| 2243 | |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame^] | 2244 | int cryptfs_enable(char *howarg, char *passwd, int allow_reboot) |
| 2245 | { |
| 2246 | /** @todo If we keep this route (user selected encryption) |
| 2247 | * need to take a type in and pass it to here. |
| 2248 | */ |
| 2249 | return cryptfs_enable_internal(howarg, CRYPT_TYPE_PASSWORD, |
| 2250 | passwd, allow_reboot); |
| 2251 | } |
| 2252 | |
| 2253 | int cryptfs_enable_default(char *howarg, int allow_reboot) |
| 2254 | { |
| 2255 | return cryptfs_enable_internal(howarg, CRYPT_TYPE_DEFAULT, |
| 2256 | DEFAULT_PASSWORD, allow_reboot); |
| 2257 | } |
| 2258 | |
| 2259 | int cryptfs_changepw(int crypt_type, const char *newpw) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2260 | { |
| 2261 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2262 | unsigned char decrypted_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2263 | |
| 2264 | /* This is only allowed after we've successfully decrypted the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2265 | if (!master_key_saved) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 2266 | SLOGE("Key not saved, aborting"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2267 | return -1; |
| 2268 | } |
| 2269 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2270 | if (crypt_type < 0 || crypt_type > CRYPT_TYPE_MAX_TYPE) { |
| 2271 | SLOGE("Invalid crypt_type %d", crypt_type); |
| 2272 | return -1; |
| 2273 | } |
| 2274 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2275 | /* get key */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2276 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2277 | SLOGE("Error getting crypt footer and key"); |
| 2278 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2279 | } |
| 2280 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2281 | crypt_ftr.crypt_type = crypt_type; |
| 2282 | |
| 2283 | encrypt_master_key(crypt_type == CRYPT_TYPE_DEFAULT ? DEFAULT_PASSWORD |
| 2284 | : newpw, |
| 2285 | crypt_ftr.salt, |
| 2286 | saved_master_key, |
| 2287 | crypt_ftr.master_key, |
| 2288 | &crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2289 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 2290 | /* save the key */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2291 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2292 | |
| 2293 | return 0; |
| 2294 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2295 | |
| 2296 | static int persist_get_key(char *fieldname, char *value) |
| 2297 | { |
| 2298 | unsigned int i; |
| 2299 | |
| 2300 | if (persist_data == NULL) { |
| 2301 | return -1; |
| 2302 | } |
| 2303 | for (i = 0; i < persist_data->persist_valid_entries; i++) { |
| 2304 | if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { |
| 2305 | /* We found it! */ |
| 2306 | strlcpy(value, persist_data->persist_entry[i].val, PROPERTY_VALUE_MAX); |
| 2307 | return 0; |
| 2308 | } |
| 2309 | } |
| 2310 | |
| 2311 | return -1; |
| 2312 | } |
| 2313 | |
| 2314 | static int persist_set_key(char *fieldname, char *value, int encrypted) |
| 2315 | { |
| 2316 | unsigned int i; |
| 2317 | unsigned int num; |
| 2318 | struct crypt_mnt_ftr crypt_ftr; |
| 2319 | unsigned int max_persistent_entries; |
| 2320 | unsigned int dsize; |
| 2321 | |
| 2322 | if (persist_data == NULL) { |
| 2323 | return -1; |
| 2324 | } |
| 2325 | |
| 2326 | /* If encrypted, use the values from the crypt_ftr, otherwise |
| 2327 | * use the values for the current spec. |
| 2328 | */ |
| 2329 | if (encrypted) { |
| 2330 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 2331 | return -1; |
| 2332 | } |
| 2333 | dsize = crypt_ftr.persist_data_size; |
| 2334 | } else { |
| 2335 | dsize = CRYPT_PERSIST_DATA_SIZE; |
| 2336 | } |
| 2337 | max_persistent_entries = (dsize - sizeof(struct crypt_persist_data)) / |
| 2338 | sizeof(struct crypt_persist_entry); |
| 2339 | |
| 2340 | num = persist_data->persist_valid_entries; |
| 2341 | |
| 2342 | for (i = 0; i < num; i++) { |
| 2343 | if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { |
| 2344 | /* We found an existing entry, update it! */ |
| 2345 | memset(persist_data->persist_entry[i].val, 0, PROPERTY_VALUE_MAX); |
| 2346 | strlcpy(persist_data->persist_entry[i].val, value, PROPERTY_VALUE_MAX); |
| 2347 | return 0; |
| 2348 | } |
| 2349 | } |
| 2350 | |
| 2351 | /* We didn't find it, add it to the end, if there is room */ |
| 2352 | if (persist_data->persist_valid_entries < max_persistent_entries) { |
| 2353 | memset(&persist_data->persist_entry[num], 0, sizeof(struct crypt_persist_entry)); |
| 2354 | strlcpy(persist_data->persist_entry[num].key, fieldname, PROPERTY_KEY_MAX); |
| 2355 | strlcpy(persist_data->persist_entry[num].val, value, PROPERTY_VALUE_MAX); |
| 2356 | persist_data->persist_valid_entries++; |
| 2357 | return 0; |
| 2358 | } |
| 2359 | |
| 2360 | return -1; |
| 2361 | } |
| 2362 | |
| 2363 | /* Return the value of the specified field. */ |
| 2364 | int cryptfs_getfield(char *fieldname, char *value, int len) |
| 2365 | { |
| 2366 | char temp_value[PROPERTY_VALUE_MAX]; |
| 2367 | char real_blkdev[MAXPATHLEN]; |
| 2368 | /* 0 is success, 1 is not encrypted, |
| 2369 | * -1 is value not set, -2 is any other error |
| 2370 | */ |
| 2371 | int rc = -2; |
| 2372 | |
| 2373 | if (persist_data == NULL) { |
| 2374 | load_persistent_data(); |
| 2375 | if (persist_data == NULL) { |
| 2376 | SLOGE("Getfield error, cannot load persistent data"); |
| 2377 | goto out; |
| 2378 | } |
| 2379 | } |
| 2380 | |
| 2381 | if (!persist_get_key(fieldname, temp_value)) { |
| 2382 | /* We found it, copy it to the caller's buffer and return */ |
| 2383 | strlcpy(value, temp_value, len); |
| 2384 | rc = 0; |
| 2385 | } else { |
| 2386 | /* Sadness, it's not there. Return the error */ |
| 2387 | rc = -1; |
| 2388 | } |
| 2389 | |
| 2390 | out: |
| 2391 | return rc; |
| 2392 | } |
| 2393 | |
| 2394 | /* Set the value of the specified field. */ |
| 2395 | int cryptfs_setfield(char *fieldname, char *value) |
| 2396 | { |
| 2397 | struct crypt_persist_data stored_pdata; |
| 2398 | struct crypt_persist_data *pdata_p; |
| 2399 | struct crypt_mnt_ftr crypt_ftr; |
| 2400 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 2401 | /* 0 is success, -1 is an error */ |
| 2402 | int rc = -1; |
| 2403 | int encrypted = 0; |
| 2404 | |
| 2405 | if (persist_data == NULL) { |
| 2406 | load_persistent_data(); |
| 2407 | if (persist_data == NULL) { |
| 2408 | SLOGE("Setfield error, cannot load persistent data"); |
| 2409 | goto out; |
| 2410 | } |
| 2411 | } |
| 2412 | |
| 2413 | property_get("ro.crypto.state", encrypted_state, ""); |
| 2414 | if (!strcmp(encrypted_state, "encrypted") ) { |
| 2415 | encrypted = 1; |
| 2416 | } |
| 2417 | |
| 2418 | if (persist_set_key(fieldname, value, encrypted)) { |
| 2419 | goto out; |
| 2420 | } |
| 2421 | |
| 2422 | /* If we are running encrypted, save the persistent data now */ |
| 2423 | if (encrypted) { |
| 2424 | if (save_persistent_data()) { |
| 2425 | SLOGE("Setfield error, cannot save persistent data"); |
| 2426 | goto out; |
| 2427 | } |
| 2428 | } |
| 2429 | |
| 2430 | rc = 0; |
| 2431 | |
| 2432 | out: |
| 2433 | return rc; |
| 2434 | } |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2435 | |
| 2436 | /* Checks userdata. Attempt to mount the volume if default- |
| 2437 | * encrypted. |
| 2438 | * On success trigger next init phase and return 0. |
| 2439 | * Currently do not handle failure - see TODO below. |
| 2440 | */ |
| 2441 | int cryptfs_mount_default_encrypted(void) |
| 2442 | { |
| 2443 | char decrypt_state[PROPERTY_VALUE_MAX]; |
| 2444 | property_get("vold.decrypt", decrypt_state, "0"); |
| 2445 | if (!strcmp(decrypt_state, "0")) { |
| 2446 | SLOGE("Not encrypted - should not call here"); |
| 2447 | } else { |
| 2448 | int crypt_type = cryptfs_get_password_type(); |
| 2449 | if (crypt_type < 0 || crypt_type > CRYPT_TYPE_MAX_TYPE) { |
| 2450 | SLOGE("Bad crypt type - error"); |
| 2451 | } else if (crypt_type != CRYPT_TYPE_DEFAULT) { |
| 2452 | SLOGD("Password is not default - " |
| 2453 | "starting min framework to prompt"); |
| 2454 | property_set("vold.decrypt", "trigger_restart_min_framework"); |
| 2455 | return 0; |
| 2456 | } else if (cryptfs_check_passwd(DEFAULT_PASSWORD) == 0) { |
| 2457 | SLOGD("Password is default - restarting filesystem"); |
| 2458 | cryptfs_restart_internal(0); |
| 2459 | return 0; |
| 2460 | } else { |
| 2461 | SLOGE("Encrypted, default crypt type but can't decrypt"); |
| 2462 | } |
| 2463 | } |
| 2464 | |
| 2465 | /** @TODO make sure we factory wipe in this situation |
| 2466 | * In general if we got here there is no recovery |
| 2467 | */ |
| 2468 | return 0; |
| 2469 | } |
| 2470 | |
| 2471 | /* Returns type of the password, default, pattern, pin or password. |
| 2472 | */ |
| 2473 | int cryptfs_get_password_type(void) |
| 2474 | { |
| 2475 | struct crypt_mnt_ftr crypt_ftr; |
| 2476 | |
| 2477 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
| 2478 | SLOGE("Error getting crypt footer and key\n"); |
| 2479 | return -1; |
| 2480 | } |
| 2481 | |
| 2482 | return crypt_ftr.crypt_type; |
| 2483 | } |