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> |
| 24 | #include <sys/stat.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <unistd.h> |
| 27 | #include <stdio.h> |
| 28 | #include <sys/ioctl.h> |
| 29 | #include <linux/dm-ioctl.h> |
| 30 | #include <libgen.h> |
| 31 | #include <stdlib.h> |
| 32 | #include <sys/param.h> |
| 33 | #include <string.h> |
| 34 | #include <sys/mount.h> |
| 35 | #include <openssl/evp.h> |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 36 | #include <openssl/sha.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 37 | #include <errno.h> |
Ken Sumrall | c290eaf | 2011-03-07 23:40:35 -0800 | [diff] [blame] | 38 | #include <cutils/android_reboot.h> |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 39 | #include <ext4.h> |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 40 | #include <linux/kdev_t.h> |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 41 | #include <fs_mgr.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 42 | #include "cryptfs.h" |
| 43 | #define LOG_TAG "Cryptfs" |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 44 | #include "cutils/android_reboot.h" |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 45 | #include "cutils/log.h" |
| 46 | #include "cutils/properties.h" |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 47 | #include "hardware_legacy/power.h" |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 48 | #include "VolumeManager.h" |
Ken Sumrall | 9caab76 | 2013-06-11 19:10:20 -0700 | [diff] [blame] | 49 | #include "VoldUtil.h" |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 50 | #include "crypto_scrypt.h" |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 51 | |
| 52 | #define DM_CRYPT_BUF_SIZE 4096 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 53 | #define DATA_MNT_POINT "/data" |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 54 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 55 | #define HASH_COUNT 2000 |
| 56 | #define KEY_LEN_BYTES 16 |
| 57 | #define IV_LEN_BYTES 16 |
| 58 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 59 | #define KEY_IN_FOOTER "footer" |
| 60 | |
| 61 | #define EXT4_FS 1 |
| 62 | #define FAT_FS 2 |
| 63 | |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 64 | #define TABLE_LOAD_RETRIES 10 |
| 65 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 66 | char *me = "cryptfs"; |
| 67 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 68 | static unsigned char saved_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 69 | static char *saved_mount_point; |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 70 | static int master_key_saved = 0; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 71 | static struct crypt_persist_data *persist_data = NULL; |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 72 | |
| 73 | extern struct fstab *fstab; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 74 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 75 | static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) |
| 76 | { |
| 77 | memset(io, 0, dataSize); |
| 78 | io->data_size = dataSize; |
| 79 | io->data_start = sizeof(struct dm_ioctl); |
| 80 | io->version[0] = 4; |
| 81 | io->version[1] = 0; |
| 82 | io->version[2] = 0; |
| 83 | io->flags = flags; |
| 84 | if (name) { |
| 85 | strncpy(io->name, name, sizeof(io->name)); |
| 86 | } |
| 87 | } |
| 88 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 89 | /** |
| 90 | * Gets the default device scrypt parameters for key derivation time tuning. |
| 91 | * The parameters should lead to about one second derivation time for the |
| 92 | * given device. |
| 93 | */ |
| 94 | static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) { |
| 95 | const int default_params[] = SCRYPT_DEFAULTS; |
| 96 | int params[] = SCRYPT_DEFAULTS; |
| 97 | char paramstr[PROPERTY_VALUE_MAX]; |
| 98 | char *token; |
| 99 | char *saveptr; |
| 100 | int i; |
| 101 | |
| 102 | property_get(SCRYPT_PROP, paramstr, ""); |
| 103 | if (paramstr[0] != '\0') { |
| 104 | /* |
| 105 | * The token we're looking for should be three integers separated by |
| 106 | * colons (e.g., "12:8:1"). Scan the property to make sure it matches. |
| 107 | */ |
| 108 | for (token = strtok_r(paramstr, ":", &saveptr); token != NULL && i < 3; |
| 109 | i++, token = strtok_r(NULL, ":", &saveptr)) { |
| 110 | char *endptr; |
| 111 | params[i] = strtol(token, &endptr, 10); |
| 112 | |
| 113 | /* |
| 114 | * Check that there was a valid number and it's 8-bit. If not, |
| 115 | * break out and the end check will take the default values. |
| 116 | */ |
| 117 | if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) { |
| 118 | break; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * If there were not enough tokens or a token was malformed (not an |
| 124 | * integer), it will end up here and the default parameters can be |
| 125 | * taken. |
| 126 | */ |
| 127 | if ((i != 3) || (token != NULL)) { |
| 128 | SLOGW("bad scrypt parameters '%s' should be like '12:8:1'; using defaults", paramstr); |
| 129 | memcpy(params, default_params, sizeof(params)); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | ftr->N_factor = params[0]; |
| 134 | ftr->r_factor = params[1]; |
| 135 | ftr->p_factor = params[2]; |
| 136 | } |
| 137 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 138 | static unsigned int get_fs_size(char *dev) |
| 139 | { |
| 140 | int fd, block_size; |
| 141 | struct ext4_super_block sb; |
| 142 | off64_t len; |
| 143 | |
| 144 | if ((fd = open(dev, O_RDONLY)) < 0) { |
| 145 | SLOGE("Cannot open device to get filesystem size "); |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | if (lseek64(fd, 1024, SEEK_SET) < 0) { |
| 150 | SLOGE("Cannot seek to superblock"); |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { |
| 155 | SLOGE("Cannot read superblock"); |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | close(fd); |
| 160 | |
| 161 | block_size = 1024 << sb.s_log_block_size; |
| 162 | /* compute length in bytes */ |
| 163 | len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; |
| 164 | |
| 165 | /* return length in sectors */ |
| 166 | return (unsigned int) (len / 512); |
| 167 | } |
| 168 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 169 | static int get_crypt_ftr_info(char **metadata_fname, off64_t *off) |
| 170 | { |
| 171 | static int cached_data = 0; |
| 172 | static off64_t cached_off = 0; |
| 173 | static char cached_metadata_fname[PROPERTY_VALUE_MAX] = ""; |
| 174 | int fd; |
| 175 | char key_loc[PROPERTY_VALUE_MAX]; |
| 176 | char real_blkdev[PROPERTY_VALUE_MAX]; |
| 177 | unsigned int nr_sec; |
| 178 | int rc = -1; |
| 179 | |
| 180 | if (!cached_data) { |
| 181 | fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc)); |
| 182 | |
| 183 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 184 | if ( (fd = open(real_blkdev, O_RDWR)) < 0) { |
| 185 | SLOGE("Cannot open real block device %s\n", real_blkdev); |
| 186 | return -1; |
| 187 | } |
| 188 | |
| 189 | if ((nr_sec = get_blkdev_size(fd))) { |
| 190 | /* If it's an encrypted Android partition, the last 16 Kbytes contain the |
| 191 | * encryption info footer and key, and plenty of bytes to spare for future |
| 192 | * growth. |
| 193 | */ |
| 194 | strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname)); |
| 195 | cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; |
| 196 | cached_data = 1; |
| 197 | } else { |
| 198 | SLOGE("Cannot get size of block device %s\n", real_blkdev); |
| 199 | } |
| 200 | close(fd); |
| 201 | } else { |
| 202 | strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname)); |
| 203 | cached_off = 0; |
| 204 | cached_data = 1; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | if (cached_data) { |
| 209 | if (metadata_fname) { |
| 210 | *metadata_fname = cached_metadata_fname; |
| 211 | } |
| 212 | if (off) { |
| 213 | *off = cached_off; |
| 214 | } |
| 215 | rc = 0; |
| 216 | } |
| 217 | |
| 218 | return rc; |
| 219 | } |
| 220 | |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 221 | /* 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] | 222 | * update the failed mount count but not change the key. |
| 223 | */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 224 | 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] | 225 | { |
| 226 | int fd; |
| 227 | unsigned int nr_sec, cnt; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 228 | /* starting_off is set to the SEEK_SET offset |
| 229 | * where the crypto structure starts |
| 230 | */ |
| 231 | off64_t starting_off; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 232 | int rc = -1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 233 | char *fname = NULL; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 234 | char key_loc[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 235 | struct stat statbuf; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 236 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 237 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 238 | SLOGE("Unable to get crypt_ftr_info\n"); |
| 239 | return -1; |
| 240 | } |
| 241 | if (fname[0] != '/') { |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 242 | SLOGE("Unexpected value for crypto key location\n"); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 243 | return -1; |
| 244 | } |
| 245 | if ( (fd = open(fname, O_RDWR)) < 0) { |
| 246 | SLOGE("Cannot open footer file %s\n", fname); |
| 247 | return -1; |
| 248 | } |
| 249 | |
| 250 | /* Seek to the start of the crypt footer */ |
| 251 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 252 | SLOGE("Cannot seek to real block device footer\n"); |
| 253 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 257 | SLOGE("Cannot write real block device footer\n"); |
| 258 | goto errout; |
| 259 | } |
| 260 | |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 261 | fstat(fd, &statbuf); |
| 262 | /* If the keys are kept on a raw block device, do not try to truncate it. */ |
| 263 | if (S_ISREG(statbuf.st_mode) && (key_loc[0] == '/')) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 264 | if (ftruncate(fd, 0x4000)) { |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 265 | SLOGE("Cannot set footer file size\n", fname); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 266 | goto errout; |
| 267 | } |
| 268 | } |
| 269 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 270 | /* Success! */ |
| 271 | rc = 0; |
| 272 | |
| 273 | errout: |
| 274 | close(fd); |
| 275 | return rc; |
| 276 | |
| 277 | } |
| 278 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 279 | static inline int unix_read(int fd, void* buff, int len) |
| 280 | { |
| 281 | return TEMP_FAILURE_RETRY(read(fd, buff, len)); |
| 282 | } |
| 283 | |
| 284 | static inline int unix_write(int fd, const void* buff, int len) |
| 285 | { |
| 286 | return TEMP_FAILURE_RETRY(write(fd, buff, len)); |
| 287 | } |
| 288 | |
| 289 | static void init_empty_persist_data(struct crypt_persist_data *pdata, int len) |
| 290 | { |
| 291 | memset(pdata, 0, len); |
| 292 | pdata->persist_magic = PERSIST_DATA_MAGIC; |
| 293 | pdata->persist_valid_entries = 0; |
| 294 | } |
| 295 | |
| 296 | /* A routine to update the passed in crypt_ftr to the lastest version. |
| 297 | * fd is open read/write on the device that holds the crypto footer and persistent |
| 298 | * data, crypt_ftr is a pointer to the struct to be updated, and offset is the |
| 299 | * absolute offset to the start of the crypt_mnt_ftr on the passed in fd. |
| 300 | */ |
| 301 | static void upgrade_crypt_ftr(int fd, struct crypt_mnt_ftr *crypt_ftr, off64_t offset) |
| 302 | { |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 303 | int orig_major = crypt_ftr->major_version; |
| 304 | int orig_minor = crypt_ftr->minor_version; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 305 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 306 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 0)) { |
| 307 | struct crypt_persist_data *pdata; |
| 308 | off64_t pdata_offset = offset + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 309 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 310 | SLOGW("upgrading crypto footer to 1.1"); |
| 311 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 312 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 313 | if (pdata == NULL) { |
| 314 | SLOGE("Cannot allocate persisent data\n"); |
| 315 | return; |
| 316 | } |
| 317 | memset(pdata, 0, CRYPT_PERSIST_DATA_SIZE); |
| 318 | |
| 319 | /* Need to initialize the persistent data area */ |
| 320 | if (lseek64(fd, pdata_offset, SEEK_SET) == -1) { |
| 321 | SLOGE("Cannot seek to persisent data offset\n"); |
| 322 | return; |
| 323 | } |
| 324 | /* Write all zeros to the first copy, making it invalid */ |
| 325 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 326 | |
| 327 | /* Write a valid but empty structure to the second copy */ |
| 328 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 329 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 330 | |
| 331 | /* Update the footer */ |
| 332 | crypt_ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 333 | crypt_ftr->persist_data_offset[0] = pdata_offset; |
| 334 | crypt_ftr->persist_data_offset[1] = pdata_offset + CRYPT_PERSIST_DATA_SIZE; |
| 335 | crypt_ftr->minor_version = 1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 338 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version)) { |
| 339 | SLOGW("upgrading crypto footer to 1.2"); |
| 340 | crypt_ftr->kdf_type = KDF_PBKDF2; |
| 341 | get_device_scrypt_params(crypt_ftr); |
| 342 | crypt_ftr->minor_version = 2; |
| 343 | } |
| 344 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 345 | if ((orig_major != crypt_ftr->major_version) || (orig_minor != crypt_ftr->minor_version)) { |
| 346 | if (lseek64(fd, offset, SEEK_SET) == -1) { |
| 347 | SLOGE("Cannot seek to crypt footer\n"); |
| 348 | return; |
| 349 | } |
| 350 | unix_write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr)); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 351 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | |
| 355 | 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] | 356 | { |
| 357 | int fd; |
| 358 | unsigned int nr_sec, cnt; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 359 | off64_t starting_off; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 360 | int rc = -1; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 361 | char key_loc[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 362 | char *fname = NULL; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 363 | struct stat statbuf; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 364 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 365 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 366 | SLOGE("Unable to get crypt_ftr_info\n"); |
| 367 | return -1; |
| 368 | } |
| 369 | if (fname[0] != '/') { |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 370 | SLOGE("Unexpected value for crypto key location\n"); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 371 | return -1; |
| 372 | } |
| 373 | if ( (fd = open(fname, O_RDWR)) < 0) { |
| 374 | SLOGE("Cannot open footer file %s\n", fname); |
| 375 | return -1; |
| 376 | } |
| 377 | |
| 378 | /* Make sure it's 16 Kbytes in length */ |
| 379 | fstat(fd, &statbuf); |
| 380 | if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { |
| 381 | SLOGE("footer file %s is not the expected size!\n", fname); |
| 382 | goto errout; |
| 383 | } |
| 384 | |
| 385 | /* Seek to the start of the crypt footer */ |
| 386 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 387 | SLOGE("Cannot seek to real block device footer\n"); |
| 388 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 392 | SLOGE("Cannot read real block device footer\n"); |
| 393 | goto errout; |
| 394 | } |
| 395 | |
| 396 | if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 397 | SLOGE("Bad magic for real block device %s\n", fname); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 398 | goto errout; |
| 399 | } |
| 400 | |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 401 | if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) { |
| 402 | SLOGE("Cannot understand major version %d real block device footer; expected %d\n", |
| 403 | crypt_ftr->major_version, CURRENT_MAJOR_VERSION); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 404 | goto errout; |
| 405 | } |
| 406 | |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 407 | if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) { |
| 408 | SLOGW("Warning: crypto footer minor version %d, expected <= %d, continuing...\n", |
| 409 | crypt_ftr->minor_version, CURRENT_MINOR_VERSION); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 410 | } |
| 411 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 412 | /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the |
| 413 | * copy on disk before returning. |
| 414 | */ |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 415 | if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 416 | upgrade_crypt_ftr(fd, crypt_ftr, starting_off); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 417 | } |
| 418 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 419 | /* Success! */ |
| 420 | rc = 0; |
| 421 | |
| 422 | errout: |
| 423 | close(fd); |
| 424 | return rc; |
| 425 | } |
| 426 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 427 | static int validate_persistent_data_storage(struct crypt_mnt_ftr *crypt_ftr) |
| 428 | { |
| 429 | if (crypt_ftr->persist_data_offset[0] + crypt_ftr->persist_data_size > |
| 430 | crypt_ftr->persist_data_offset[1]) { |
| 431 | SLOGE("Crypt_ftr persist data regions overlap"); |
| 432 | return -1; |
| 433 | } |
| 434 | |
| 435 | if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) { |
| 436 | SLOGE("Crypt_ftr persist data region 0 starts after region 1"); |
| 437 | return -1; |
| 438 | } |
| 439 | |
| 440 | if (((crypt_ftr->persist_data_offset[1] + crypt_ftr->persist_data_size) - |
| 441 | (crypt_ftr->persist_data_offset[0] - CRYPT_FOOTER_TO_PERSIST_OFFSET)) > |
| 442 | CRYPT_FOOTER_OFFSET) { |
| 443 | SLOGE("Persistent data extends past crypto footer"); |
| 444 | return -1; |
| 445 | } |
| 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | static int load_persistent_data(void) |
| 451 | { |
| 452 | struct crypt_mnt_ftr crypt_ftr; |
| 453 | struct crypt_persist_data *pdata = NULL; |
| 454 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 455 | char *fname; |
| 456 | int found = 0; |
| 457 | int fd; |
| 458 | int ret; |
| 459 | int i; |
| 460 | |
| 461 | if (persist_data) { |
| 462 | /* Nothing to do, we've already loaded or initialized it */ |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | |
| 467 | /* If not encrypted, just allocate an empty table and initialize it */ |
| 468 | property_get("ro.crypto.state", encrypted_state, ""); |
| 469 | if (strcmp(encrypted_state, "encrypted") ) { |
| 470 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 471 | if (pdata) { |
| 472 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 473 | persist_data = pdata; |
| 474 | return 0; |
| 475 | } |
| 476 | return -1; |
| 477 | } |
| 478 | |
| 479 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 480 | return -1; |
| 481 | } |
| 482 | |
| 483 | if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) { |
| 484 | SLOGE("Crypt_ftr version doesn't support persistent data"); |
| 485 | return -1; |
| 486 | } |
| 487 | |
| 488 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 489 | return -1; |
| 490 | } |
| 491 | |
| 492 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 493 | if (ret) { |
| 494 | return -1; |
| 495 | } |
| 496 | |
| 497 | fd = open(fname, O_RDONLY); |
| 498 | if (fd < 0) { |
| 499 | SLOGE("Cannot open %s metadata file", fname); |
| 500 | return -1; |
| 501 | } |
| 502 | |
| 503 | if (persist_data == NULL) { |
| 504 | pdata = malloc(crypt_ftr.persist_data_size); |
| 505 | if (pdata == NULL) { |
| 506 | SLOGE("Cannot allocate memory for persistent data"); |
| 507 | goto err; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | for (i = 0; i < 2; i++) { |
| 512 | if (lseek64(fd, crypt_ftr.persist_data_offset[i], SEEK_SET) < 0) { |
| 513 | SLOGE("Cannot seek to read persistent data on %s", fname); |
| 514 | goto err2; |
| 515 | } |
| 516 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){ |
| 517 | SLOGE("Error reading persistent data on iteration %d", i); |
| 518 | goto err2; |
| 519 | } |
| 520 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 521 | found = 1; |
| 522 | break; |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | if (!found) { |
| 527 | SLOGI("Could not find valid persistent data, creating"); |
| 528 | init_empty_persist_data(pdata, crypt_ftr.persist_data_size); |
| 529 | } |
| 530 | |
| 531 | /* Success */ |
| 532 | persist_data = pdata; |
| 533 | close(fd); |
| 534 | return 0; |
| 535 | |
| 536 | err2: |
| 537 | free(pdata); |
| 538 | |
| 539 | err: |
| 540 | close(fd); |
| 541 | return -1; |
| 542 | } |
| 543 | |
| 544 | static int save_persistent_data(void) |
| 545 | { |
| 546 | struct crypt_mnt_ftr crypt_ftr; |
| 547 | struct crypt_persist_data *pdata; |
| 548 | char *fname; |
| 549 | off64_t write_offset; |
| 550 | off64_t erase_offset; |
| 551 | int found = 0; |
| 552 | int fd; |
| 553 | int ret; |
| 554 | |
| 555 | if (persist_data == NULL) { |
| 556 | SLOGE("No persistent data to save"); |
| 557 | return -1; |
| 558 | } |
| 559 | |
| 560 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 561 | return -1; |
| 562 | } |
| 563 | |
| 564 | if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) { |
| 565 | SLOGE("Crypt_ftr version doesn't support persistent data"); |
| 566 | return -1; |
| 567 | } |
| 568 | |
| 569 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 570 | if (ret) { |
| 571 | return -1; |
| 572 | } |
| 573 | |
| 574 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 575 | return -1; |
| 576 | } |
| 577 | |
| 578 | fd = open(fname, O_RDWR); |
| 579 | if (fd < 0) { |
| 580 | SLOGE("Cannot open %s metadata file", fname); |
| 581 | return -1; |
| 582 | } |
| 583 | |
| 584 | pdata = malloc(crypt_ftr.persist_data_size); |
| 585 | if (pdata == NULL) { |
| 586 | SLOGE("Cannot allocate persistant data"); |
| 587 | goto err; |
| 588 | } |
| 589 | |
| 590 | if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) { |
| 591 | SLOGE("Cannot seek to read persistent data on %s", fname); |
| 592 | goto err2; |
| 593 | } |
| 594 | |
| 595 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) { |
| 596 | SLOGE("Error reading persistent data before save"); |
| 597 | goto err2; |
| 598 | } |
| 599 | |
| 600 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 601 | /* The first copy is the curent valid copy, so write to |
| 602 | * the second copy and erase this one */ |
| 603 | write_offset = crypt_ftr.persist_data_offset[1]; |
| 604 | erase_offset = crypt_ftr.persist_data_offset[0]; |
| 605 | } else { |
| 606 | /* The second copy must be the valid copy, so write to |
| 607 | * the first copy, and erase the second */ |
| 608 | write_offset = crypt_ftr.persist_data_offset[0]; |
| 609 | erase_offset = crypt_ftr.persist_data_offset[1]; |
| 610 | } |
| 611 | |
| 612 | /* Write the new copy first, if successful, then erase the old copy */ |
| 613 | if (lseek(fd, write_offset, SEEK_SET) < 0) { |
| 614 | SLOGE("Cannot seek to write persistent data"); |
| 615 | goto err2; |
| 616 | } |
| 617 | if (unix_write(fd, persist_data, crypt_ftr.persist_data_size) == |
| 618 | (int) crypt_ftr.persist_data_size) { |
| 619 | if (lseek(fd, erase_offset, SEEK_SET) < 0) { |
| 620 | SLOGE("Cannot seek to erase previous persistent data"); |
| 621 | goto err2; |
| 622 | } |
| 623 | fsync(fd); |
| 624 | memset(pdata, 0, crypt_ftr.persist_data_size); |
| 625 | if (unix_write(fd, pdata, crypt_ftr.persist_data_size) != |
| 626 | (int) crypt_ftr.persist_data_size) { |
| 627 | SLOGE("Cannot write to erase previous persistent data"); |
| 628 | goto err2; |
| 629 | } |
| 630 | fsync(fd); |
| 631 | } else { |
| 632 | SLOGE("Cannot write to save persistent data"); |
| 633 | goto err2; |
| 634 | } |
| 635 | |
| 636 | /* Success */ |
| 637 | free(pdata); |
| 638 | close(fd); |
| 639 | return 0; |
| 640 | |
| 641 | err2: |
| 642 | free(pdata); |
| 643 | err: |
| 644 | close(fd); |
| 645 | return -1; |
| 646 | } |
| 647 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 648 | /* Convert a binary key of specified length into an ascii hex string equivalent, |
| 649 | * without the leading 0x and with null termination |
| 650 | */ |
| 651 | void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, |
| 652 | char *master_key_ascii) |
| 653 | { |
| 654 | unsigned int i, a; |
| 655 | unsigned char nibble; |
| 656 | |
| 657 | for (i=0, a=0; i<keysize; i++, a+=2) { |
| 658 | /* For each byte, write out two ascii hex digits */ |
| 659 | nibble = (master_key[i] >> 4) & 0xf; |
| 660 | master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 661 | |
| 662 | nibble = master_key[i] & 0xf; |
| 663 | master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 664 | } |
| 665 | |
| 666 | /* Add the null termination */ |
| 667 | master_key_ascii[a] = '\0'; |
| 668 | |
| 669 | } |
| 670 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 671 | static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
| 672 | char *real_blk_name, const char *name, int fd, |
| 673 | char *extra_params) |
| 674 | { |
| 675 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 676 | struct dm_ioctl *io; |
| 677 | struct dm_target_spec *tgt; |
| 678 | char *crypt_params; |
| 679 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 680 | int i; |
| 681 | |
| 682 | io = (struct dm_ioctl *) buffer; |
| 683 | |
| 684 | /* Load the mapping table for this device */ |
| 685 | tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; |
| 686 | |
| 687 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 688 | io->target_count = 1; |
| 689 | tgt->status = 0; |
| 690 | tgt->sector_start = 0; |
| 691 | tgt->length = crypt_ftr->fs_size; |
| 692 | strcpy(tgt->target_type, "crypt"); |
| 693 | |
| 694 | crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); |
| 695 | convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); |
| 696 | sprintf(crypt_params, "%s %s 0 %s 0 %s", crypt_ftr->crypto_type_name, |
| 697 | master_key_ascii, real_blk_name, extra_params); |
| 698 | crypt_params += strlen(crypt_params) + 1; |
| 699 | crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ |
| 700 | tgt->next = crypt_params - buffer; |
| 701 | |
| 702 | for (i = 0; i < TABLE_LOAD_RETRIES; i++) { |
| 703 | if (! ioctl(fd, DM_TABLE_LOAD, io)) { |
| 704 | break; |
| 705 | } |
| 706 | usleep(500000); |
| 707 | } |
| 708 | |
| 709 | if (i == TABLE_LOAD_RETRIES) { |
| 710 | /* We failed to load the table, return an error */ |
| 711 | return -1; |
| 712 | } else { |
| 713 | return i + 1; |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | |
| 718 | static int get_dm_crypt_version(int fd, const char *name, int *version) |
| 719 | { |
| 720 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 721 | struct dm_ioctl *io; |
| 722 | struct dm_target_versions *v; |
| 723 | int i; |
| 724 | |
| 725 | io = (struct dm_ioctl *) buffer; |
| 726 | |
| 727 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 728 | |
| 729 | if (ioctl(fd, DM_LIST_VERSIONS, io)) { |
| 730 | return -1; |
| 731 | } |
| 732 | |
| 733 | /* Iterate over the returned versions, looking for name of "crypt". |
| 734 | * When found, get and return the version. |
| 735 | */ |
| 736 | v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)]; |
| 737 | while (v->next) { |
| 738 | if (! strcmp(v->name, "crypt")) { |
| 739 | /* We found the crypt driver, return the version, and get out */ |
| 740 | version[0] = v->version[0]; |
| 741 | version[1] = v->version[1]; |
| 742 | version[2] = v->version[2]; |
| 743 | return 0; |
| 744 | } |
| 745 | v = (struct dm_target_versions *)(((char *)v) + v->next); |
| 746 | } |
| 747 | |
| 748 | return -1; |
| 749 | } |
| 750 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 751 | 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] | 752 | char *real_blk_name, char *crypto_blk_name, const char *name) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 753 | { |
| 754 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 755 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 756 | char *crypt_params; |
| 757 | struct dm_ioctl *io; |
| 758 | struct dm_target_spec *tgt; |
| 759 | unsigned int minor; |
| 760 | int fd; |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 761 | int i; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 762 | int retval = -1; |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 763 | int version[3]; |
| 764 | char *extra_params; |
| 765 | int load_count; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 766 | |
| 767 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 768 | SLOGE("Cannot open device-mapper\n"); |
| 769 | goto errout; |
| 770 | } |
| 771 | |
| 772 | io = (struct dm_ioctl *) buffer; |
| 773 | |
| 774 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 775 | if (ioctl(fd, DM_DEV_CREATE, io)) { |
| 776 | SLOGE("Cannot create dm-crypt device\n"); |
| 777 | goto errout; |
| 778 | } |
| 779 | |
| 780 | /* Get the device status, in particular, the name of it's device file */ |
| 781 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 782 | if (ioctl(fd, DM_DEV_STATUS, io)) { |
| 783 | SLOGE("Cannot retrieve dm-crypt device status\n"); |
| 784 | goto errout; |
| 785 | } |
| 786 | minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); |
| 787 | snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); |
| 788 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 789 | extra_params = ""; |
| 790 | if (! get_dm_crypt_version(fd, name, version)) { |
| 791 | /* Support for allow_discards was added in version 1.11.0 */ |
| 792 | if ((version[0] >= 2) || |
| 793 | ((version[0] == 1) && (version[1] >= 11))) { |
| 794 | extra_params = "1 allow_discards"; |
| 795 | SLOGI("Enabling support for allow_discards in dmcrypt.\n"); |
| 796 | } |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 799 | load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name, |
| 800 | fd, extra_params); |
| 801 | if (load_count < 0) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 802 | SLOGE("Cannot load dm-crypt mapping table.\n"); |
| 803 | goto errout; |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 804 | } else if (load_count > 1) { |
| 805 | SLOGI("Took %d tries to load dmcrypt table.\n", load_count); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* Resume this device to activate it */ |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 809 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 810 | |
| 811 | if (ioctl(fd, DM_DEV_SUSPEND, io)) { |
| 812 | SLOGE("Cannot resume the dm-crypt device\n"); |
| 813 | goto errout; |
| 814 | } |
| 815 | |
| 816 | /* We made it here with no errors. Woot! */ |
| 817 | retval = 0; |
| 818 | |
| 819 | errout: |
| 820 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 821 | |
| 822 | return retval; |
| 823 | } |
| 824 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 825 | static int delete_crypto_blk_dev(char *name) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 826 | { |
| 827 | int fd; |
| 828 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 829 | struct dm_ioctl *io; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 830 | int retval = -1; |
| 831 | |
| 832 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 833 | SLOGE("Cannot open device-mapper\n"); |
| 834 | goto errout; |
| 835 | } |
| 836 | |
| 837 | io = (struct dm_ioctl *) buffer; |
| 838 | |
| 839 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 840 | if (ioctl(fd, DM_DEV_REMOVE, io)) { |
| 841 | SLOGE("Cannot remove dm-crypt device\n"); |
| 842 | goto errout; |
| 843 | } |
| 844 | |
| 845 | /* We made it here with no errors. Woot! */ |
| 846 | retval = 0; |
| 847 | |
| 848 | errout: |
| 849 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 850 | |
| 851 | return retval; |
| 852 | |
| 853 | } |
| 854 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 855 | static void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey, void *params) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 856 | /* Turn the password into a key and IV that can decrypt the master key */ |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 857 | PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, SALT_LEN, |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 858 | HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 859 | } |
| 860 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 861 | static void scrypt(char *passwd, unsigned char *salt, unsigned char *ikey, void *params) { |
| 862 | struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; |
| 863 | |
| 864 | int N = 1 << ftr->N_factor; |
| 865 | int r = 1 << ftr->r_factor; |
| 866 | int p = 1 << ftr->p_factor; |
| 867 | |
| 868 | /* Turn the password into a key and IV that can decrypt the master key */ |
| 869 | crypto_scrypt((unsigned char *) passwd, strlen(passwd), salt, SALT_LEN, N, r, p, ikey, |
| 870 | KEY_LEN_BYTES + IV_LEN_BYTES); |
| 871 | } |
| 872 | |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 873 | static int encrypt_master_key(char *passwd, unsigned char *salt, |
| 874 | unsigned char *decrypted_master_key, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 875 | unsigned char *encrypted_master_key, |
| 876 | struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 877 | { |
| 878 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
| 879 | EVP_CIPHER_CTX e_ctx; |
| 880 | int encrypted_len, final_len; |
| 881 | |
| 882 | /* 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^] | 883 | get_device_scrypt_params(crypt_ftr); |
| 884 | scrypt(passwd, salt, ikey, crypt_ftr); |
| 885 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 886 | /* Initialize the decryption engine */ |
| 887 | if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 888 | SLOGE("EVP_EncryptInit failed\n"); |
| 889 | return -1; |
| 890 | } |
| 891 | 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] | 892 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 893 | /* Encrypt the master key */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 894 | if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, |
| 895 | decrypted_master_key, KEY_LEN_BYTES)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 896 | SLOGE("EVP_EncryptUpdate failed\n"); |
| 897 | return -1; |
| 898 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 899 | if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 900 | SLOGE("EVP_EncryptFinal failed\n"); |
| 901 | return -1; |
| 902 | } |
| 903 | |
| 904 | if (encrypted_len + final_len != KEY_LEN_BYTES) { |
| 905 | SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); |
| 906 | return -1; |
| 907 | } else { |
| 908 | return 0; |
| 909 | } |
| 910 | } |
| 911 | |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 912 | static int decrypt_master_key(char *passwd, unsigned char *salt, |
| 913 | unsigned char *encrypted_master_key, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 914 | unsigned char *decrypted_master_key, |
| 915 | kdf_func kdf, void *kdf_params) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 916 | { |
| 917 | 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] | 918 | EVP_CIPHER_CTX d_ctx; |
| 919 | int decrypted_len, final_len; |
| 920 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 921 | /* 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^] | 922 | kdf(passwd, salt, ikey, kdf_params); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 923 | |
| 924 | /* Initialize the decryption engine */ |
| 925 | if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 926 | return -1; |
| 927 | } |
| 928 | EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ |
| 929 | /* Decrypt the master key */ |
| 930 | if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, |
| 931 | encrypted_master_key, KEY_LEN_BYTES)) { |
| 932 | return -1; |
| 933 | } |
| 934 | if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { |
| 935 | return -1; |
| 936 | } |
| 937 | |
| 938 | if (decrypted_len + final_len != KEY_LEN_BYTES) { |
| 939 | return -1; |
| 940 | } else { |
| 941 | return 0; |
| 942 | } |
| 943 | } |
| 944 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 945 | 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] | 946 | { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 947 | if (ftr->kdf_type == KDF_SCRYPT) { |
| 948 | *kdf = scrypt; |
| 949 | *kdf_params = ftr; |
| 950 | } else { |
| 951 | *kdf = pbkdf2; |
| 952 | *kdf_params = NULL; |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | static int decrypt_master_key_and_upgrade(char *passwd, unsigned char *decrypted_master_key, |
| 957 | struct crypt_mnt_ftr *crypt_ftr) |
| 958 | { |
| 959 | kdf_func kdf; |
| 960 | void *kdf_params; |
| 961 | int ret; |
| 962 | |
| 963 | get_kdf_func(crypt_ftr, &kdf, &kdf_params); |
| 964 | ret = decrypt_master_key(passwd, crypt_ftr->salt, crypt_ftr->master_key, decrypted_master_key, kdf, |
| 965 | kdf_params); |
| 966 | if (ret != 0) { |
| 967 | SLOGW("failure decrypting master key"); |
| 968 | return ret; |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * Upgrade if we're not using the latest KDF. |
| 973 | */ |
| 974 | if (crypt_ftr->kdf_type != KDF_SCRYPT) { |
| 975 | crypt_ftr->kdf_type = KDF_SCRYPT; |
| 976 | encrypt_master_key(passwd, crypt_ftr->salt, decrypted_master_key, crypt_ftr->master_key, |
| 977 | crypt_ftr); |
| 978 | put_crypt_ftr_and_key(crypt_ftr); |
| 979 | } |
| 980 | |
| 981 | return ret; |
| 982 | } |
| 983 | |
| 984 | static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt, |
| 985 | struct crypt_mnt_ftr *crypt_ftr) { |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 986 | int fd; |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 987 | unsigned char key_buf[KEY_LEN_BYTES]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 988 | EVP_CIPHER_CTX e_ctx; |
| 989 | int encrypted_len, final_len; |
| 990 | |
| 991 | /* Get some random bits for a key */ |
| 992 | fd = open("/dev/urandom", O_RDONLY); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 993 | read(fd, key_buf, sizeof(key_buf)); |
| 994 | read(fd, salt, SALT_LEN); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 995 | close(fd); |
| 996 | |
| 997 | /* Now encrypt it with the password */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 998 | return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 999 | } |
| 1000 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1001 | static int wait_and_unmount(char *mountpoint) |
| 1002 | { |
| 1003 | int i, rc; |
Ken Sumrall | 2eaf713 | 2011-01-14 12:45:48 -0800 | [diff] [blame] | 1004 | #define WAIT_UNMOUNT_COUNT 20 |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1005 | |
| 1006 | /* Now umount the tmpfs filesystem */ |
| 1007 | for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { |
| 1008 | if (umount(mountpoint)) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1009 | if (errno == EINVAL) { |
| 1010 | /* EINVAL is returned if the directory is not a mountpoint, |
| 1011 | * i.e. there is no filesystem mounted there. So just get out. |
| 1012 | */ |
| 1013 | break; |
| 1014 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1015 | sleep(1); |
| 1016 | i++; |
| 1017 | } else { |
| 1018 | break; |
| 1019 | } |
| 1020 | } |
| 1021 | |
| 1022 | if (i < WAIT_UNMOUNT_COUNT) { |
| 1023 | SLOGD("unmounting %s succeeded\n", mountpoint); |
| 1024 | rc = 0; |
| 1025 | } else { |
| 1026 | SLOGE("unmounting %s failed\n", mountpoint); |
| 1027 | rc = -1; |
| 1028 | } |
| 1029 | |
| 1030 | return rc; |
| 1031 | } |
| 1032 | |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1033 | #define DATA_PREP_TIMEOUT 200 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1034 | static int prep_data_fs(void) |
| 1035 | { |
| 1036 | int i; |
| 1037 | |
| 1038 | /* Do the prep of the /data filesystem */ |
| 1039 | property_set("vold.post_fs_data_done", "0"); |
| 1040 | property_set("vold.decrypt", "trigger_post_fs_data"); |
| 1041 | SLOGD("Just triggered post_fs_data\n"); |
| 1042 | |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1043 | /* Wait a max of 50 seconds, hopefully it takes much less */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1044 | for (i=0; i<DATA_PREP_TIMEOUT; i++) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1045 | char p[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1046 | |
| 1047 | property_get("vold.post_fs_data_done", p, "0"); |
| 1048 | if (*p == '1') { |
| 1049 | break; |
| 1050 | } else { |
| 1051 | usleep(250000); |
| 1052 | } |
| 1053 | } |
| 1054 | if (i == DATA_PREP_TIMEOUT) { |
| 1055 | /* Ugh, we failed to prep /data in time. Bail. */ |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1056 | SLOGE("post_fs_data timed out!\n"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1057 | return -1; |
| 1058 | } else { |
| 1059 | SLOGD("post_fs_data done\n"); |
| 1060 | return 0; |
| 1061 | } |
| 1062 | } |
| 1063 | |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1064 | int cryptfs_restart(void) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1065 | { |
| 1066 | char fs_type[32]; |
| 1067 | char real_blkdev[MAXPATHLEN]; |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1068 | char crypto_blkdev[MAXPATHLEN]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1069 | char fs_options[256]; |
| 1070 | unsigned long mnt_flags; |
| 1071 | struct stat statbuf; |
| 1072 | int rc = -1, i; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1073 | static int restart_successful = 0; |
| 1074 | |
| 1075 | /* Validate that it's OK to call this routine */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1076 | if (! master_key_saved) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1077 | SLOGE("Encrypted filesystem not validated, aborting"); |
| 1078 | return -1; |
| 1079 | } |
| 1080 | |
| 1081 | if (restart_successful) { |
| 1082 | SLOGE("System already restarted with encrypted disk, aborting"); |
| 1083 | return -1; |
| 1084 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1085 | |
| 1086 | /* Here is where we shut down the framework. The init scripts |
| 1087 | * start all services in one of three classes: core, main or late_start. |
| 1088 | * On boot, we start core and main. Now, we stop main, but not core, |
| 1089 | * as core includes vold and a few other really important things that |
| 1090 | * we need to keep running. Once main has stopped, we should be able |
| 1091 | * to umount the tmpfs /data, then mount the encrypted /data. |
| 1092 | * We then restart the class main, and also the class late_start. |
| 1093 | * At the moment, I've only put a few things in late_start that I know |
| 1094 | * are not needed to bring up the framework, and that also cause problems |
| 1095 | * with unmounting the tmpfs /data, but I hope to add add more services |
| 1096 | * to the late_start class as we optimize this to decrease the delay |
| 1097 | * till the user is asked for the password to the filesystem. |
| 1098 | */ |
| 1099 | |
| 1100 | /* The init files are setup to stop the class main when vold.decrypt is |
| 1101 | * set to trigger_reset_main. |
| 1102 | */ |
| 1103 | property_set("vold.decrypt", "trigger_reset_main"); |
| 1104 | SLOGD("Just asked init to shut down class main\n"); |
| 1105 | |
Ken Sumrall | 92736ef | 2012-10-17 20:57:14 -0700 | [diff] [blame] | 1106 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 1107 | * can be fixed, this horrible hack will wait a moment for it all to |
| 1108 | * shut down before proceeding. Without it, some devices cannot |
| 1109 | * restart the graphics services. |
| 1110 | */ |
| 1111 | sleep(2); |
Ken Sumrall | 9dedfd4 | 2012-10-09 14:16:59 -0700 | [diff] [blame] | 1112 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1113 | /* Now that the framework is shutdown, we should be able to umount() |
| 1114 | * the tmpfs filesystem, and mount the real one. |
| 1115 | */ |
| 1116 | |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1117 | property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); |
| 1118 | if (strlen(crypto_blkdev) == 0) { |
| 1119 | SLOGE("fs_crypto_blkdev not set\n"); |
| 1120 | return -1; |
| 1121 | } |
| 1122 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1123 | if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { |
| 1124 | /* If that succeeded, then mount the decrypted filesystem */ |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1125 | fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, 0); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1126 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1127 | property_set("vold.decrypt", "trigger_load_persist_props"); |
| 1128 | /* Create necessary paths on /data */ |
| 1129 | if (prep_data_fs()) { |
| 1130 | return -1; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1131 | } |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1132 | |
| 1133 | /* startup service classes main and late_start */ |
| 1134 | property_set("vold.decrypt", "trigger_restart_framework"); |
| 1135 | SLOGD("Just triggered restart_framework\n"); |
| 1136 | |
| 1137 | /* Give it a few moments to get started */ |
| 1138 | sleep(1); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1139 | } |
| 1140 | |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1141 | if (rc == 0) { |
| 1142 | restart_successful = 1; |
| 1143 | } |
| 1144 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1145 | return rc; |
| 1146 | } |
| 1147 | |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1148 | static int do_crypto_complete(char *mount_point) |
| 1149 | { |
| 1150 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1151 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | e1a4585 | 2011-12-14 21:24:27 -0800 | [diff] [blame] | 1152 | char key_loc[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1153 | |
| 1154 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1155 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1156 | SLOGE("not running with encryption, aborting"); |
| 1157 | return 1; |
| 1158 | } |
| 1159 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1160 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1161 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1162 | |
Ken Sumrall | e1a4585 | 2011-12-14 21:24:27 -0800 | [diff] [blame] | 1163 | /* |
| 1164 | * Only report this error if key_loc is a file and it exists. |
| 1165 | * If the device was never encrypted, and /data is not mountable for |
| 1166 | * some reason, returning 1 should prevent the UI from presenting the |
| 1167 | * a "enter password" screen, or worse, a "press button to wipe the |
| 1168 | * device" screen. |
| 1169 | */ |
| 1170 | if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) { |
| 1171 | SLOGE("master key file does not exist, aborting"); |
| 1172 | return 1; |
| 1173 | } else { |
| 1174 | SLOGE("Error getting crypt footer and key\n"); |
| 1175 | return -1; |
| 1176 | } |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1177 | } |
| 1178 | |
| 1179 | if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS) { |
| 1180 | SLOGE("Encryption process didn't finish successfully\n"); |
| 1181 | return -2; /* -2 is the clue to the UI that there is no usable data on the disk, |
| 1182 | * and give the user an option to wipe the disk */ |
| 1183 | } |
| 1184 | |
| 1185 | /* We passed the test! We shall diminish, and return to the west */ |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1189 | static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1190 | { |
| 1191 | struct crypt_mnt_ftr crypt_ftr; |
| 1192 | /* 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] | 1193 | unsigned char decrypted_master_key[32]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1194 | char crypto_blkdev[MAXPATHLEN]; |
| 1195 | char real_blkdev[MAXPATHLEN]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1196 | char tmp_mount_point[64]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1197 | unsigned int orig_failed_decrypt_count; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1198 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1199 | int rc; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1200 | kdf_func kdf; |
| 1201 | void *kdf_params; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1202 | |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1203 | property_get("ro.crypto.state", encrypted_state, ""); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1204 | if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1205 | SLOGE("encrypted fs already validated or not running with encryption, aborting"); |
| 1206 | return -1; |
| 1207 | } |
| 1208 | |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1209 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1210 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1211 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1212 | SLOGE("Error getting crypt footer and key\n"); |
| 1213 | return -1; |
| 1214 | } |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 1215 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1216 | SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size); |
| 1217 | orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count; |
| 1218 | |
| 1219 | if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1220 | decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1221 | } |
| 1222 | |
| 1223 | if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1224 | real_blkdev, crypto_blkdev, label)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1225 | SLOGE("Error creating decrypted block device\n"); |
| 1226 | return -1; |
| 1227 | } |
| 1228 | |
Alex Klyubin | 707795a | 2013-05-10 15:17:07 -0700 | [diff] [blame] | 1229 | /* 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] | 1230 | * encrypted fs into the tmpfs /data filesystem, and then the framework finds those |
| 1231 | * files and passes that data to me */ |
| 1232 | /* Create a tmp mount point to try mounting the decryptd fs |
| 1233 | * Since we're here, the mount_point should be a tmpfs filesystem, so make |
| 1234 | * a directory in it to test mount the decrypted filesystem. |
| 1235 | */ |
| 1236 | sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); |
| 1237 | mkdir(tmp_mount_point, 0755); |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1238 | 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] | 1239 | SLOGE("Error temp mounting decrypted block device\n"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1240 | delete_crypto_blk_dev(label); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1241 | crypt_ftr.failed_decrypt_count++; |
| 1242 | } else { |
| 1243 | /* Success, so just umount and we'll mount it properly when we restart |
| 1244 | * the framework. |
| 1245 | */ |
| 1246 | umount(tmp_mount_point); |
| 1247 | crypt_ftr.failed_decrypt_count = 0; |
| 1248 | } |
| 1249 | |
| 1250 | if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1251 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1252 | } |
| 1253 | |
| 1254 | if (crypt_ftr.failed_decrypt_count) { |
| 1255 | /* We failed to mount the device, so return an error */ |
| 1256 | rc = crypt_ftr.failed_decrypt_count; |
| 1257 | |
| 1258 | } else { |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1259 | /* Woot! Success! Save the name of the crypto block device |
| 1260 | * so we can mount it when restarting the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1261 | */ |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1262 | property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1263 | |
| 1264 | /* Also save a the master key so we can reencrypted the key |
| 1265 | * the key when we want to change the password on it. |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1266 | */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1267 | memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES); |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1268 | saved_mount_point = strdup(mount_point); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1269 | master_key_saved = 1; |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1270 | rc = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1271 | } |
| 1272 | |
| 1273 | return rc; |
| 1274 | } |
| 1275 | |
Ken Sumrall | 0b8b597 | 2011-08-31 16:14:23 -0700 | [diff] [blame] | 1276 | /* Called by vold when it wants to undo the crypto mapping of a volume it |
| 1277 | * manages. This is usually in response to a factory reset, when we want |
| 1278 | * to undo the crypto mapping so the volume is formatted in the clear. |
| 1279 | */ |
| 1280 | int cryptfs_revert_volume(const char *label) |
| 1281 | { |
| 1282 | return delete_crypto_blk_dev((char *)label); |
| 1283 | } |
| 1284 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1285 | /* |
| 1286 | * Called by vold when it's asked to mount an encrypted, nonremovable volume. |
| 1287 | * Setup a dm-crypt mapping, use the saved master key from |
| 1288 | * setting up the /data mapping, and return the new device path. |
| 1289 | */ |
| 1290 | int cryptfs_setup_volume(const char *label, int major, int minor, |
| 1291 | char *crypto_sys_path, unsigned int max_path, |
| 1292 | int *new_major, int *new_minor) |
| 1293 | { |
| 1294 | char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN]; |
| 1295 | struct crypt_mnt_ftr sd_crypt_ftr; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1296 | struct stat statbuf; |
| 1297 | int nr_sec, fd; |
| 1298 | |
| 1299 | sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor); |
| 1300 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1301 | get_crypt_ftr_and_key(&sd_crypt_ftr); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1302 | |
| 1303 | /* Update the fs_size field to be the size of the volume */ |
| 1304 | fd = open(real_blkdev, O_RDONLY); |
| 1305 | nr_sec = get_blkdev_size(fd); |
| 1306 | close(fd); |
| 1307 | if (nr_sec == 0) { |
| 1308 | SLOGE("Cannot get size of volume %s\n", real_blkdev); |
| 1309 | return -1; |
| 1310 | } |
| 1311 | |
| 1312 | sd_crypt_ftr.fs_size = nr_sec; |
| 1313 | create_crypto_blk_dev(&sd_crypt_ftr, saved_master_key, real_blkdev, |
| 1314 | crypto_blkdev, label); |
| 1315 | |
| 1316 | stat(crypto_blkdev, &statbuf); |
| 1317 | *new_major = MAJOR(statbuf.st_rdev); |
| 1318 | *new_minor = MINOR(statbuf.st_rdev); |
| 1319 | |
| 1320 | /* Create path to sys entry for this block device */ |
| 1321 | snprintf(crypto_sys_path, max_path, "/devices/virtual/block/%s", strrchr(crypto_blkdev, '/')+1); |
| 1322 | |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1326 | int cryptfs_crypto_complete(void) |
| 1327 | { |
| 1328 | return do_crypto_complete("/data"); |
| 1329 | } |
| 1330 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1331 | int cryptfs_check_passwd(char *passwd) |
| 1332 | { |
| 1333 | int rc = -1; |
| 1334 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1335 | rc = test_mount_encrypted_fs(passwd, DATA_MNT_POINT, "userdata"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1336 | |
| 1337 | return rc; |
| 1338 | } |
| 1339 | |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1340 | int cryptfs_verify_passwd(char *passwd) |
| 1341 | { |
| 1342 | struct crypt_mnt_ftr crypt_ftr; |
| 1343 | /* 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] | 1344 | unsigned char decrypted_master_key[32]; |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1345 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1346 | int rc; |
| 1347 | |
| 1348 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1349 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1350 | SLOGE("device not encrypted, aborting"); |
| 1351 | return -2; |
| 1352 | } |
| 1353 | |
| 1354 | if (!master_key_saved) { |
| 1355 | SLOGE("encrypted fs not yet mounted, aborting"); |
| 1356 | return -1; |
| 1357 | } |
| 1358 | |
| 1359 | if (!saved_mount_point) { |
| 1360 | SLOGE("encrypted fs failed to save mount point, aborting"); |
| 1361 | return -1; |
| 1362 | } |
| 1363 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1364 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1365 | SLOGE("Error getting crypt footer and key\n"); |
| 1366 | return -1; |
| 1367 | } |
| 1368 | |
| 1369 | if (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) { |
| 1370 | /* If the device has no password, then just say the password is valid */ |
| 1371 | rc = 0; |
| 1372 | } else { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1373 | decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr); |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1374 | if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) { |
| 1375 | /* They match, the password is correct */ |
| 1376 | rc = 0; |
| 1377 | } else { |
| 1378 | /* If incorrect, sleep for a bit to prevent dictionary attacks */ |
| 1379 | sleep(1); |
| 1380 | rc = 1; |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | return rc; |
| 1385 | } |
| 1386 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1387 | /* Initialize a crypt_mnt_ftr structure. The keysize is |
| 1388 | * defaulted to 16 bytes, and the filesystem size to 0. |
| 1389 | * Presumably, at a minimum, the caller will update the |
| 1390 | * filesystem size and crypto_type_name after calling this function. |
| 1391 | */ |
| 1392 | static void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) |
| 1393 | { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1394 | off64_t off; |
| 1395 | |
| 1396 | memset(ftr, 0, sizeof(struct crypt_mnt_ftr)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1397 | ftr->magic = CRYPT_MNT_MAGIC; |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 1398 | ftr->major_version = CURRENT_MAJOR_VERSION; |
| 1399 | ftr->minor_version = CURRENT_MINOR_VERSION; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1400 | ftr->ftr_size = sizeof(struct crypt_mnt_ftr); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1401 | ftr->keysize = KEY_LEN_BYTES; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1402 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1403 | ftr->kdf_type = KDF_SCRYPT; |
| 1404 | get_device_scrypt_params(ftr); |
| 1405 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1406 | ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 1407 | if (get_crypt_ftr_info(NULL, &off) == 0) { |
| 1408 | ftr->persist_data_offset[0] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
| 1409 | ftr->persist_data_offset[1] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET + |
| 1410 | ftr->persist_data_size; |
| 1411 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1412 | } |
| 1413 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1414 | 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] | 1415 | { |
| 1416 | char cmdline[256]; |
| 1417 | int rc = -1; |
| 1418 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1419 | if (type == EXT4_FS) { |
| 1420 | snprintf(cmdline, sizeof(cmdline), "/system/bin/make_ext4fs -a /data -l %lld %s", |
| 1421 | size * 512, crypto_blkdev); |
| 1422 | SLOGI("Making empty filesystem with command %s\n", cmdline); |
| 1423 | } else if (type== FAT_FS) { |
| 1424 | snprintf(cmdline, sizeof(cmdline), "/system/bin/newfs_msdos -F 32 -O android -c 8 -s %lld %s", |
| 1425 | size, crypto_blkdev); |
| 1426 | SLOGI("Making empty filesystem with command %s\n", cmdline); |
| 1427 | } else { |
| 1428 | SLOGE("cryptfs_enable_wipe(): unknown filesystem type %d\n", type); |
| 1429 | return -1; |
| 1430 | } |
| 1431 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1432 | if (system(cmdline)) { |
| 1433 | SLOGE("Error creating empty filesystem on %s\n", crypto_blkdev); |
| 1434 | } else { |
| 1435 | SLOGD("Successfully created empty filesystem on %s\n", crypto_blkdev); |
| 1436 | rc = 0; |
| 1437 | } |
| 1438 | |
| 1439 | return rc; |
| 1440 | } |
| 1441 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1442 | #define CRYPT_INPLACE_BUFSIZE 4096 |
| 1443 | #define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1444 | static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size, |
| 1445 | off64_t *size_already_done, off64_t tot_size) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1446 | { |
| 1447 | int realfd, cryptofd; |
| 1448 | char *buf[CRYPT_INPLACE_BUFSIZE]; |
| 1449 | int rc = -1; |
| 1450 | off64_t numblocks, i, remainder; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1451 | off64_t one_pct, cur_pct, new_pct; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1452 | off64_t blocks_already_done, tot_numblocks; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1453 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1454 | if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { |
| 1455 | SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); |
| 1456 | return -1; |
| 1457 | } |
| 1458 | |
| 1459 | if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 1460 | SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1461 | close(realfd); |
| 1462 | return -1; |
| 1463 | } |
| 1464 | |
| 1465 | /* This is pretty much a simple loop of reading 4K, and writing 4K. |
| 1466 | * The size passed in is the number of 512 byte sectors in the filesystem. |
| 1467 | * So compute the number of whole 4K blocks we should read/write, |
| 1468 | * and the remainder. |
| 1469 | */ |
| 1470 | numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 1471 | remainder = size % CRYPT_SECTORS_PER_BUFSIZE; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1472 | tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 1473 | blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1474 | |
| 1475 | SLOGE("Encrypting filesystem in place..."); |
| 1476 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1477 | one_pct = tot_numblocks / 100; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1478 | cur_pct = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1479 | /* process the majority of the filesystem in blocks */ |
| 1480 | for (i=0; i<numblocks; i++) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1481 | new_pct = (i + blocks_already_done) / one_pct; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1482 | if (new_pct > cur_pct) { |
| 1483 | char buf[8]; |
| 1484 | |
| 1485 | cur_pct = new_pct; |
| 1486 | snprintf(buf, sizeof(buf), "%lld", cur_pct); |
| 1487 | property_set("vold.encrypt_progress", buf); |
| 1488 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1489 | if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { |
| 1490 | SLOGE("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1491 | goto errout; |
| 1492 | } |
| 1493 | if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { |
| 1494 | SLOGE("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1495 | goto errout; |
| 1496 | } |
| 1497 | } |
| 1498 | |
| 1499 | /* Do any remaining sectors */ |
| 1500 | for (i=0; i<remainder; i++) { |
| 1501 | if (unix_read(realfd, buf, 512) <= 0) { |
| 1502 | SLOGE("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1503 | goto errout; |
| 1504 | } |
| 1505 | if (unix_write(cryptofd, buf, 512) <= 0) { |
| 1506 | SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 1507 | goto errout; |
| 1508 | } |
| 1509 | } |
| 1510 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1511 | *size_already_done += size; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1512 | rc = 0; |
| 1513 | |
| 1514 | errout: |
| 1515 | close(realfd); |
| 1516 | close(cryptofd); |
| 1517 | |
| 1518 | return rc; |
| 1519 | } |
| 1520 | |
| 1521 | #define CRYPTO_ENABLE_WIPE 1 |
| 1522 | #define CRYPTO_ENABLE_INPLACE 2 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1523 | |
| 1524 | #define FRAMEWORK_BOOT_WAIT 60 |
| 1525 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1526 | static inline int should_encrypt(struct volume_info *volume) |
| 1527 | { |
| 1528 | return (volume->flags & (VOL_ENCRYPTABLE | VOL_NONREMOVABLE)) == |
| 1529 | (VOL_ENCRYPTABLE | VOL_NONREMOVABLE); |
| 1530 | } |
| 1531 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1532 | int cryptfs_enable(char *howarg, char *passwd) |
| 1533 | { |
| 1534 | int how = 0; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1535 | char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN], sd_crypto_blkdev[MAXPATHLEN]; |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1536 | unsigned long nr_sec; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1537 | unsigned char decrypted_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 319b104 | 2011-06-14 14:01:55 -0700 | [diff] [blame] | 1538 | int rc=-1, fd, i, ret; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1539 | struct crypt_mnt_ftr crypt_ftr, sd_crypt_ftr;; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1540 | struct crypt_persist_data *pdata; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1541 | char tmpfs_options[PROPERTY_VALUE_MAX]; |
| 1542 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1543 | char lockid[32] = { 0 }; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1544 | char key_loc[PROPERTY_VALUE_MAX]; |
| 1545 | char fuse_sdcard[PROPERTY_VALUE_MAX]; |
| 1546 | char *sd_mnt_point; |
| 1547 | char sd_blk_dev[256] = { 0 }; |
| 1548 | int num_vols; |
| 1549 | struct volume_info *vol_list = 0; |
| 1550 | off64_t cur_encryption_done=0, tot_encryption_size=0; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1551 | |
| 1552 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1553 | if (strcmp(encrypted_state, "unencrypted")) { |
| 1554 | SLOGE("Device is already running encrypted, aborting"); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1555 | goto error_unencrypted; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1556 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1557 | |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1558 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1559 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1560 | if (!strcmp(howarg, "wipe")) { |
| 1561 | how = CRYPTO_ENABLE_WIPE; |
| 1562 | } else if (! strcmp(howarg, "inplace")) { |
| 1563 | how = CRYPTO_ENABLE_INPLACE; |
| 1564 | } else { |
| 1565 | /* Shouldn't happen, as CommandListener vets the args */ |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1566 | goto error_unencrypted; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1567 | } |
| 1568 | |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1569 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1570 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1571 | /* Get the size of the real block device */ |
| 1572 | fd = open(real_blkdev, O_RDONLY); |
| 1573 | if ( (nr_sec = get_blkdev_size(fd)) == 0) { |
| 1574 | SLOGE("Cannot get size of block device %s\n", real_blkdev); |
| 1575 | goto error_unencrypted; |
| 1576 | } |
| 1577 | close(fd); |
| 1578 | |
| 1579 | /* 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] | 1580 | if ((how == CRYPTO_ENABLE_INPLACE) && (!strcmp(key_loc, KEY_IN_FOOTER))) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1581 | unsigned int fs_size_sec, max_fs_size_sec; |
| 1582 | |
| 1583 | fs_size_sec = get_fs_size(real_blkdev); |
| 1584 | max_fs_size_sec = nr_sec - (CRYPT_FOOTER_OFFSET / 512); |
| 1585 | |
| 1586 | if (fs_size_sec > max_fs_size_sec) { |
| 1587 | SLOGE("Orig filesystem overlaps crypto footer region. Cannot encrypt in place."); |
| 1588 | goto error_unencrypted; |
| 1589 | } |
| 1590 | } |
| 1591 | |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1592 | /* Get a wakelock as this may take a while, and we don't want the |
| 1593 | * device to sleep on us. We'll grab a partial wakelock, and if the UI |
| 1594 | * wants to keep the screen on, it can grab a full wakelock. |
| 1595 | */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1596 | snprintf(lockid, sizeof(lockid), "enablecrypto%d", (int) getpid()); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1597 | acquire_wake_lock(PARTIAL_WAKE_LOCK, lockid); |
| 1598 | |
Jeff Sharkey | 7382f81 | 2012-08-23 14:08:59 -0700 | [diff] [blame] | 1599 | /* Get the sdcard mount point */ |
Jeff Sharkey | b77bc46 | 2012-10-01 14:36:26 -0700 | [diff] [blame] | 1600 | sd_mnt_point = getenv("EMULATED_STORAGE_SOURCE"); |
Jeff Sharkey | 7382f81 | 2012-08-23 14:08:59 -0700 | [diff] [blame] | 1601 | if (!sd_mnt_point) { |
| 1602 | sd_mnt_point = getenv("EXTERNAL_STORAGE"); |
| 1603 | } |
| 1604 | if (!sd_mnt_point) { |
| 1605 | sd_mnt_point = "/mnt/sdcard"; |
| 1606 | } |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1607 | |
| 1608 | num_vols=vold_getNumDirectVolumes(); |
| 1609 | vol_list = malloc(sizeof(struct volume_info) * num_vols); |
| 1610 | vold_getDirectVolumeList(vol_list); |
| 1611 | |
| 1612 | for (i=0; i<num_vols; i++) { |
| 1613 | if (should_encrypt(&vol_list[i])) { |
| 1614 | fd = open(vol_list[i].blk_dev, O_RDONLY); |
| 1615 | if ( (vol_list[i].size = get_blkdev_size(fd)) == 0) { |
| 1616 | SLOGE("Cannot get size of block device %s\n", vol_list[i].blk_dev); |
| 1617 | goto error_unencrypted; |
| 1618 | } |
| 1619 | close(fd); |
| 1620 | |
Ken Sumrall | 3b17005 | 2011-07-11 15:38:57 -0700 | [diff] [blame] | 1621 | ret=vold_disableVol(vol_list[i].label); |
Ken Sumrall | 319b104 | 2011-06-14 14:01:55 -0700 | [diff] [blame] | 1622 | if ((ret < 0) && (ret != UNMOUNT_NOT_MOUNTED_ERR)) { |
| 1623 | /* -2 is returned when the device exists but is not currently mounted. |
| 1624 | * ignore the error and continue. */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1625 | SLOGE("Failed to unmount volume %s\n", vol_list[i].label); |
| 1626 | goto error_unencrypted; |
| 1627 | } |
| 1628 | } |
| 1629 | } |
| 1630 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1631 | /* 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] | 1632 | * vold sets trigger_shutdown_framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1633 | */ |
| 1634 | property_set("vold.decrypt", "trigger_shutdown_framework"); |
| 1635 | SLOGD("Just asked init to shut down class main\n"); |
| 1636 | |
Ken Sumrall | 425524d | 2012-06-14 20:55:28 -0700 | [diff] [blame] | 1637 | if (vold_unmountAllAsecs()) { |
| 1638 | /* Just report the error. If any are left mounted, |
| 1639 | * umounting /data below will fail and handle the error. |
| 1640 | */ |
| 1641 | SLOGE("Error unmounting internal asecs"); |
| 1642 | } |
| 1643 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1644 | property_get("ro.crypto.fuse_sdcard", fuse_sdcard, ""); |
| 1645 | if (!strcmp(fuse_sdcard, "true")) { |
| 1646 | /* This is a device using the fuse layer to emulate the sdcard semantics |
| 1647 | * on top of the userdata partition. vold does not manage it, it is managed |
| 1648 | * by the sdcard service. The sdcard service was killed by the property trigger |
| 1649 | * above, so just unmount it now. We must do this _AFTER_ killing the framework, |
| 1650 | * unlike the case for vold managed devices above. |
| 1651 | */ |
| 1652 | if (wait_and_unmount(sd_mnt_point)) { |
| 1653 | goto error_shutting_down; |
| 1654 | } |
Ken Sumrall | 2eaf713 | 2011-01-14 12:45:48 -0800 | [diff] [blame] | 1655 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1656 | |
| 1657 | /* Now unmount the /data partition. */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1658 | if (wait_and_unmount(DATA_MNT_POINT)) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1659 | goto error_shutting_down; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1660 | } |
| 1661 | |
| 1662 | /* Do extra work for a better UX when doing the long inplace encryption */ |
| 1663 | if (how == CRYPTO_ENABLE_INPLACE) { |
| 1664 | /* Now that /data is unmounted, we need to mount a tmpfs |
| 1665 | * /data, set a property saying we're doing inplace encryption, |
| 1666 | * and restart the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1667 | */ |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1668 | if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1669 | goto error_shutting_down; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1670 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1671 | /* Tells the framework that inplace encryption is starting */ |
Ken Sumrall | 7df8412 | 2011-01-18 14:04:08 -0800 | [diff] [blame] | 1672 | property_set("vold.encrypt_progress", "0"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1673 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1674 | /* restart the framework. */ |
| 1675 | /* Create necessary paths on /data */ |
| 1676 | if (prep_data_fs()) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1677 | goto error_shutting_down; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1678 | } |
| 1679 | |
Ken Sumrall | 92736ef | 2012-10-17 20:57:14 -0700 | [diff] [blame] | 1680 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 1681 | * can be fixed, this horrible hack will wait a moment for it all to |
| 1682 | * shut down before proceeding. Without it, some devices cannot |
| 1683 | * restart the graphics services. |
| 1684 | */ |
| 1685 | sleep(2); |
| 1686 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1687 | /* startup service classes main and late_start */ |
| 1688 | property_set("vold.decrypt", "trigger_restart_min_framework"); |
| 1689 | SLOGD("Just triggered restart_min_framework\n"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1690 | |
Ken Sumrall | 7df8412 | 2011-01-18 14:04:08 -0800 | [diff] [blame] | 1691 | /* OK, the framework is restarted and will soon be showing a |
| 1692 | * progress bar. Time to setup an encrypted mapping, and |
| 1693 | * either write a new filesystem, or encrypt in place updating |
| 1694 | * the progress bar as we work. |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1695 | */ |
| 1696 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1697 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1698 | /* Start the actual work of making an encrypted filesystem */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1699 | /* Initialize a crypt_mnt_ftr for the partition */ |
| 1700 | cryptfs_init_crypt_mnt_ftr(&crypt_ftr); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1701 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1702 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 1703 | crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512); |
| 1704 | } else { |
| 1705 | crypt_ftr.fs_size = nr_sec; |
| 1706 | } |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 1707 | crypt_ftr.flags |= CRYPT_ENCRYPTION_IN_PROGRESS; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1708 | strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); |
| 1709 | |
| 1710 | /* Make an encrypted master key */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1711 | 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] | 1712 | SLOGE("Cannot create encrypted master key\n"); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1713 | goto error_unencrypted; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1714 | } |
| 1715 | |
| 1716 | /* Write the key to the end of the partition */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1717 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1718 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1719 | /* If any persistent data has been remembered, save it. |
| 1720 | * If none, create a valid empty table and save that. |
| 1721 | */ |
| 1722 | if (!persist_data) { |
| 1723 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 1724 | if (pdata) { |
| 1725 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 1726 | persist_data = pdata; |
| 1727 | } |
| 1728 | } |
| 1729 | if (persist_data) { |
| 1730 | save_persistent_data(); |
| 1731 | } |
| 1732 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1733 | decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1734 | create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev, |
| 1735 | "userdata"); |
| 1736 | |
Ken Sumrall | 128626f | 2011-06-28 18:45:14 -0700 | [diff] [blame] | 1737 | /* The size of the userdata partition, and add in the vold volumes below */ |
| 1738 | tot_encryption_size = crypt_ftr.fs_size; |
| 1739 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1740 | /* setup crypto mapping for all encryptable volumes handled by vold */ |
| 1741 | for (i=0; i<num_vols; i++) { |
| 1742 | if (should_encrypt(&vol_list[i])) { |
| 1743 | vol_list[i].crypt_ftr = crypt_ftr; /* gotta love struct assign */ |
| 1744 | vol_list[i].crypt_ftr.fs_size = vol_list[i].size; |
| 1745 | create_crypto_blk_dev(&vol_list[i].crypt_ftr, decrypted_master_key, |
| 1746 | vol_list[i].blk_dev, vol_list[i].crypto_blkdev, |
| 1747 | vol_list[i].label); |
Ken Sumrall | 128626f | 2011-06-28 18:45:14 -0700 | [diff] [blame] | 1748 | tot_encryption_size += vol_list[i].size; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1749 | } |
| 1750 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1751 | |
| 1752 | if (how == CRYPTO_ENABLE_WIPE) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1753 | rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr.fs_size, EXT4_FS); |
| 1754 | /* Encrypt all encryptable volumes handled by vold */ |
| 1755 | if (!rc) { |
| 1756 | for (i=0; i<num_vols; i++) { |
| 1757 | if (should_encrypt(&vol_list[i])) { |
| 1758 | rc = cryptfs_enable_wipe(vol_list[i].crypto_blkdev, |
| 1759 | vol_list[i].crypt_ftr.fs_size, FAT_FS); |
| 1760 | } |
| 1761 | } |
| 1762 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1763 | } else if (how == CRYPTO_ENABLE_INPLACE) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1764 | rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, crypt_ftr.fs_size, |
| 1765 | &cur_encryption_done, tot_encryption_size); |
| 1766 | /* Encrypt all encryptable volumes handled by vold */ |
| 1767 | if (!rc) { |
| 1768 | for (i=0; i<num_vols; i++) { |
| 1769 | if (should_encrypt(&vol_list[i])) { |
| 1770 | rc = cryptfs_enable_inplace(vol_list[i].crypto_blkdev, |
| 1771 | vol_list[i].blk_dev, |
| 1772 | vol_list[i].crypt_ftr.fs_size, |
| 1773 | &cur_encryption_done, tot_encryption_size); |
| 1774 | } |
| 1775 | } |
| 1776 | } |
| 1777 | if (!rc) { |
| 1778 | /* The inplace routine never actually sets the progress to 100% |
| 1779 | * due to the round down nature of integer division, so set it here */ |
| 1780 | property_set("vold.encrypt_progress", "100"); |
| 1781 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1782 | } else { |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1783 | /* Shouldn't happen */ |
| 1784 | SLOGE("cryptfs_enable: internal error, unknown option\n"); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1785 | goto error_unencrypted; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1786 | } |
| 1787 | |
| 1788 | /* Undo the dm-crypt mapping whether we succeed or not */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1789 | delete_crypto_blk_dev("userdata"); |
| 1790 | for (i=0; i<num_vols; i++) { |
| 1791 | if (should_encrypt(&vol_list[i])) { |
| 1792 | delete_crypto_blk_dev(vol_list[i].label); |
| 1793 | } |
| 1794 | } |
| 1795 | |
| 1796 | free(vol_list); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1797 | |
| 1798 | if (! rc) { |
| 1799 | /* Success */ |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1800 | |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 1801 | /* Clear the encryption in progres flag in the footer */ |
| 1802 | crypt_ftr.flags &= ~CRYPT_ENCRYPTION_IN_PROGRESS; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1803 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 1804 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1805 | sleep(2); /* Give the UI a chance to show 100% progress */ |
Ken Sumrall | c290eaf | 2011-03-07 23:40:35 -0800 | [diff] [blame] | 1806 | android_reboot(ANDROID_RB_RESTART, 0, 0); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1807 | } else { |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 1808 | char value[PROPERTY_VALUE_MAX]; |
| 1809 | |
Ken Sumrall | 319369a | 2012-06-27 16:30:18 -0700 | [diff] [blame] | 1810 | property_get("ro.vold.wipe_on_crypt_fail", value, "0"); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 1811 | if (!strcmp(value, "1")) { |
| 1812 | /* wipe data if encryption failed */ |
| 1813 | SLOGE("encryption failed - rebooting into recovery to wipe data\n"); |
| 1814 | mkdir("/cache/recovery", 0700); |
Nick Kralevich | 4684e58 | 2012-06-26 15:07:03 -0700 | [diff] [blame] | 1815 | 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] | 1816 | if (fd >= 0) { |
| 1817 | write(fd, "--wipe_data", strlen("--wipe_data") + 1); |
| 1818 | close(fd); |
| 1819 | } else { |
| 1820 | SLOGE("could not open /cache/recovery/command\n"); |
| 1821 | } |
| 1822 | android_reboot(ANDROID_RB_RESTART2, 0, "recovery"); |
| 1823 | } else { |
| 1824 | /* set property to trigger dialog */ |
| 1825 | property_set("vold.encrypt_progress", "error_partially_encrypted"); |
| 1826 | release_wake_lock(lockid); |
| 1827 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1828 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1829 | } |
| 1830 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1831 | /* hrm, the encrypt step claims success, but the reboot failed. |
| 1832 | * This should not happen. |
| 1833 | * Set the property and return. Hope the framework can deal with it. |
| 1834 | */ |
| 1835 | property_set("vold.encrypt_progress", "error_reboot_failed"); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1836 | release_wake_lock(lockid); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1837 | return rc; |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1838 | |
| 1839 | error_unencrypted: |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1840 | free(vol_list); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1841 | property_set("vold.encrypt_progress", "error_not_encrypted"); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1842 | if (lockid[0]) { |
| 1843 | release_wake_lock(lockid); |
| 1844 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1845 | return -1; |
| 1846 | |
| 1847 | error_shutting_down: |
| 1848 | /* we failed, and have not encrypted anthing, so the users's data is still intact, |
| 1849 | * but the framework is stopped and not restarted to show the error, so it's up to |
| 1850 | * vold to restart the system. |
| 1851 | */ |
| 1852 | SLOGE("Error enabling encryption after framework is shutdown, no data changed, restarting system"); |
Ken Sumrall | c290eaf | 2011-03-07 23:40:35 -0800 | [diff] [blame] | 1853 | android_reboot(ANDROID_RB_RESTART, 0, 0); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1854 | |
| 1855 | /* shouldn't get here */ |
| 1856 | property_set("vold.encrypt_progress", "error_shutting_down"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1857 | free(vol_list); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 1858 | if (lockid[0]) { |
| 1859 | release_wake_lock(lockid); |
| 1860 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 1861 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1862 | } |
| 1863 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1864 | int cryptfs_changepw(char *newpw) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1865 | { |
| 1866 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1867 | unsigned char decrypted_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1868 | |
| 1869 | /* This is only allowed after we've successfully decrypted the master key */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1870 | if (! master_key_saved) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1871 | SLOGE("Key not saved, aborting"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1872 | return -1; |
| 1873 | } |
| 1874 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1875 | /* get key */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1876 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 57b63e6 | 2011-01-17 18:29:19 -0800 | [diff] [blame] | 1877 | SLOGE("Error getting crypt footer and key"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1878 | return -1; |
| 1879 | } |
| 1880 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame^] | 1881 | encrypt_master_key(newpw, crypt_ftr.salt, saved_master_key, crypt_ftr.master_key, &crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1882 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1883 | /* save the key */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1884 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1885 | |
| 1886 | return 0; |
| 1887 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1888 | |
| 1889 | static int persist_get_key(char *fieldname, char *value) |
| 1890 | { |
| 1891 | unsigned int i; |
| 1892 | |
| 1893 | if (persist_data == NULL) { |
| 1894 | return -1; |
| 1895 | } |
| 1896 | for (i = 0; i < persist_data->persist_valid_entries; i++) { |
| 1897 | if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { |
| 1898 | /* We found it! */ |
| 1899 | strlcpy(value, persist_data->persist_entry[i].val, PROPERTY_VALUE_MAX); |
| 1900 | return 0; |
| 1901 | } |
| 1902 | } |
| 1903 | |
| 1904 | return -1; |
| 1905 | } |
| 1906 | |
| 1907 | static int persist_set_key(char *fieldname, char *value, int encrypted) |
| 1908 | { |
| 1909 | unsigned int i; |
| 1910 | unsigned int num; |
| 1911 | struct crypt_mnt_ftr crypt_ftr; |
| 1912 | unsigned int max_persistent_entries; |
| 1913 | unsigned int dsize; |
| 1914 | |
| 1915 | if (persist_data == NULL) { |
| 1916 | return -1; |
| 1917 | } |
| 1918 | |
| 1919 | /* If encrypted, use the values from the crypt_ftr, otherwise |
| 1920 | * use the values for the current spec. |
| 1921 | */ |
| 1922 | if (encrypted) { |
| 1923 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 1924 | return -1; |
| 1925 | } |
| 1926 | dsize = crypt_ftr.persist_data_size; |
| 1927 | } else { |
| 1928 | dsize = CRYPT_PERSIST_DATA_SIZE; |
| 1929 | } |
| 1930 | max_persistent_entries = (dsize - sizeof(struct crypt_persist_data)) / |
| 1931 | sizeof(struct crypt_persist_entry); |
| 1932 | |
| 1933 | num = persist_data->persist_valid_entries; |
| 1934 | |
| 1935 | for (i = 0; i < num; i++) { |
| 1936 | if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { |
| 1937 | /* We found an existing entry, update it! */ |
| 1938 | memset(persist_data->persist_entry[i].val, 0, PROPERTY_VALUE_MAX); |
| 1939 | strlcpy(persist_data->persist_entry[i].val, value, PROPERTY_VALUE_MAX); |
| 1940 | return 0; |
| 1941 | } |
| 1942 | } |
| 1943 | |
| 1944 | /* We didn't find it, add it to the end, if there is room */ |
| 1945 | if (persist_data->persist_valid_entries < max_persistent_entries) { |
| 1946 | memset(&persist_data->persist_entry[num], 0, sizeof(struct crypt_persist_entry)); |
| 1947 | strlcpy(persist_data->persist_entry[num].key, fieldname, PROPERTY_KEY_MAX); |
| 1948 | strlcpy(persist_data->persist_entry[num].val, value, PROPERTY_VALUE_MAX); |
| 1949 | persist_data->persist_valid_entries++; |
| 1950 | return 0; |
| 1951 | } |
| 1952 | |
| 1953 | return -1; |
| 1954 | } |
| 1955 | |
| 1956 | /* Return the value of the specified field. */ |
| 1957 | int cryptfs_getfield(char *fieldname, char *value, int len) |
| 1958 | { |
| 1959 | char temp_value[PROPERTY_VALUE_MAX]; |
| 1960 | char real_blkdev[MAXPATHLEN]; |
| 1961 | /* 0 is success, 1 is not encrypted, |
| 1962 | * -1 is value not set, -2 is any other error |
| 1963 | */ |
| 1964 | int rc = -2; |
| 1965 | |
| 1966 | if (persist_data == NULL) { |
| 1967 | load_persistent_data(); |
| 1968 | if (persist_data == NULL) { |
| 1969 | SLOGE("Getfield error, cannot load persistent data"); |
| 1970 | goto out; |
| 1971 | } |
| 1972 | } |
| 1973 | |
| 1974 | if (!persist_get_key(fieldname, temp_value)) { |
| 1975 | /* We found it, copy it to the caller's buffer and return */ |
| 1976 | strlcpy(value, temp_value, len); |
| 1977 | rc = 0; |
| 1978 | } else { |
| 1979 | /* Sadness, it's not there. Return the error */ |
| 1980 | rc = -1; |
| 1981 | } |
| 1982 | |
| 1983 | out: |
| 1984 | return rc; |
| 1985 | } |
| 1986 | |
| 1987 | /* Set the value of the specified field. */ |
| 1988 | int cryptfs_setfield(char *fieldname, char *value) |
| 1989 | { |
| 1990 | struct crypt_persist_data stored_pdata; |
| 1991 | struct crypt_persist_data *pdata_p; |
| 1992 | struct crypt_mnt_ftr crypt_ftr; |
| 1993 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1994 | /* 0 is success, -1 is an error */ |
| 1995 | int rc = -1; |
| 1996 | int encrypted = 0; |
| 1997 | |
| 1998 | if (persist_data == NULL) { |
| 1999 | load_persistent_data(); |
| 2000 | if (persist_data == NULL) { |
| 2001 | SLOGE("Setfield error, cannot load persistent data"); |
| 2002 | goto out; |
| 2003 | } |
| 2004 | } |
| 2005 | |
| 2006 | property_get("ro.crypto.state", encrypted_state, ""); |
| 2007 | if (!strcmp(encrypted_state, "encrypted") ) { |
| 2008 | encrypted = 1; |
| 2009 | } |
| 2010 | |
| 2011 | if (persist_set_key(fieldname, value, encrypted)) { |
| 2012 | goto out; |
| 2013 | } |
| 2014 | |
| 2015 | /* If we are running encrypted, save the persistent data now */ |
| 2016 | if (encrypted) { |
| 2017 | if (save_persistent_data()) { |
| 2018 | SLOGE("Setfield error, cannot save persistent data"); |
| 2019 | goto out; |
| 2020 | } |
| 2021 | } |
| 2022 | |
| 2023 | rc = 0; |
| 2024 | |
| 2025 | out: |
| 2026 | return rc; |
| 2027 | } |