diff options
Diffstat (limited to 'crypto/jb/cryptfs.c')
| -rw-r--r-- | crypto/jb/cryptfs.c | 1735 |
1 files changed, 0 insertions, 1735 deletions
diff --git a/crypto/jb/cryptfs.c b/crypto/jb/cryptfs.c deleted file mode 100644 index f9c0d7489..000000000 --- a/crypto/jb/cryptfs.c +++ /dev/null @@ -1,1735 +0,0 @@ -/* - * Copyright (C) 2010 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/* TO DO: - * 1. Perhaps keep several copies of the encrypted key, in case something - * goes horribly wrong? - * - */ - -#include <sys/types.h> -#include <sys/wait.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <unistd.h> -#include <stdio.h> -#include <sys/ioctl.h> -#include <linux/dm-ioctl.h> -#include <libgen.h> -#include <stdlib.h> -#include <sys/param.h> -#include <string.h> -#include <sys/mount.h> -#include <openssl/evp.h> -#include <openssl/sha.h> -#include <errno.h> -#include <ext4.h> -#include <linux/kdev_t.h> -#include <fs_mgr.h> -#include "cryptfs.h" -#define LOG_TAG "Cryptfs" -#include "cutils/log.h" -#include "cutils/properties.h" -#include "cutils/android_reboot.h" -#include "hardware_legacy/power.h" -/*#include <logwrap/logwrap.h> -#include "VolumeManager.h" -#include "VoldUtil.h"*/ -#include "crypto_scrypt.h" - -#define DM_CRYPT_BUF_SIZE 4096 -#define DATA_MNT_POINT "/data" - -#define HASH_COUNT 2000 -#define KEY_LEN_BYTES 16 -#define IV_LEN_BYTES 16 - -#define KEY_IN_FOOTER "footer" - -#define EXT4_FS 1 -#define FAT_FS 2 - -#define TABLE_LOAD_RETRIES 10 - -char *me = "cryptfs"; - -static unsigned char saved_master_key[KEY_LEN_BYTES]; -static char *saved_mount_point; -static int master_key_saved = 0; -static struct crypt_persist_data *persist_data = NULL; - -struct fstab *fstab; - -static void cryptfs_reboot(int recovery) -{ - /*if (recovery) { - property_set(ANDROID_RB_PROPERTY, "reboot,recovery"); - } else { - property_set(ANDROID_RB_PROPERTY, "reboot"); - } - sleep(20);*/ - - /* Shouldn't get here, reboot should happen before sleep times out */ - return; -} - -static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) -{ - memset(io, 0, dataSize); - io->data_size = dataSize; - io->data_start = sizeof(struct dm_ioctl); - io->version[0] = 4; - io->version[1] = 0; - io->version[2] = 0; - io->flags = flags; - if (name) { - strncpy(io->name, name, sizeof(io->name)); - } -} - -/** - * Gets the default device scrypt parameters for key derivation time tuning. - * The parameters should lead to about one second derivation time for the - * given device. - */ -static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) { - const int default_params[] = SCRYPT_DEFAULTS; - int params[] = SCRYPT_DEFAULTS; - char paramstr[PROPERTY_VALUE_MAX]; - char *token; - char *saveptr; - int i; - - property_get(SCRYPT_PROP, paramstr, ""); - if (paramstr[0] != '\0') { - /* - * The token we're looking for should be three integers separated by - * colons (e.g., "12:8:1"). Scan the property to make sure it matches. - */ - for (i = 0, token = strtok_r(paramstr, ":", &saveptr); - token != NULL && i < 3; - i++, token = strtok_r(NULL, ":", &saveptr)) { - char *endptr; - params[i] = strtol(token, &endptr, 10); - - /* - * Check that there was a valid number and it's 8-bit. If not, - * break out and the end check will take the default values. - */ - if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) { - break; - } - } - - /* - * If there were not enough tokens or a token was malformed (not an - * integer), it will end up here and the default parameters can be - * taken. - */ - if ((i != 3) || (token != NULL)) { - printf("bad scrypt parameters '%s' should be like '12:8:1'; using defaults", paramstr); - memcpy(params, default_params, sizeof(params)); - } - } - - ftr->N_factor = params[0]; - ftr->r_factor = params[1]; - ftr->p_factor = params[2]; -} - -static unsigned int get_fs_size(char *dev) -{ - int fd, block_size; - struct ext4_super_block sb; - off64_t len; - - if ((fd = open(dev, O_RDONLY)) < 0) { - printf("Cannot open device to get filesystem size "); - return 0; - } - - if (lseek64(fd, 1024, SEEK_SET) < 0) { - printf("Cannot seek to superblock"); - return 0; - } - - if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { - printf("Cannot read superblock"); - return 0; - } - - close(fd); - - block_size = 1024 << sb.s_log_block_size; - /* compute length in bytes */ - len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; - - /* return length in sectors */ - return (unsigned int) (len / 512); -} - -static unsigned int get_blkdev_size(int fd) -{ - unsigned int nr_sec; - - if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { - nr_sec = 0; - } - - return nr_sec; -} - -static int get_crypt_ftr_info(char **metadata_fname, off64_t *off) -{ - static int cached_data = 0; - static off64_t cached_off = 0; - static char cached_metadata_fname[PROPERTY_VALUE_MAX] = ""; - int fd; - char key_loc[PROPERTY_VALUE_MAX]; - char real_blkdev[PROPERTY_VALUE_MAX]; - unsigned int nr_sec; - int rc = -1; - - if (!cached_data) { - fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc)); - - if (!strcmp(key_loc, KEY_IN_FOOTER)) { - if ( (fd = open(real_blkdev, O_RDWR)) < 0) { - printf("Cannot open real block device %s\n", real_blkdev); - return -1; - } - - if ((nr_sec = get_blkdev_size(fd))) { - /* If it's an encrypted Android partition, the last 16 Kbytes contain the - * encryption info footer and key, and plenty of bytes to spare for future - * growth. - */ - strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname)); - cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; - cached_data = 1; - } else { - printf("Cannot get size of block device %s\n", real_blkdev); - } - close(fd); - } else { - strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname)); - cached_off = 0; - cached_data = 1; - } - } - - if (cached_data) { - if (metadata_fname) { - *metadata_fname = cached_metadata_fname; - } - if (off) { - *off = cached_off; - } - rc = 0; - } - - return rc; -} - -/* key or salt can be NULL, in which case just skip writing that value. Useful to - * update the failed mount count but not change the key. - */ -static int put_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) -{ - int fd; - unsigned int nr_sec, cnt; - /* starting_off is set to the SEEK_SET offset - * where the crypto structure starts - */ - off64_t starting_off; - int rc = -1; - char *fname = NULL; - struct stat statbuf; - - if (get_crypt_ftr_info(&fname, &starting_off)) { - printf("Unable to get crypt_ftr_info\n"); - return -1; - } - if (fname[0] != '/') { - printf("Unexpected value for crypto key location\n"); - return -1; - } - if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) { - printf("Cannot open footer file %s for put\n", fname); - return -1; - } - - /* Seek to the start of the crypt footer */ - if (lseek64(fd, starting_off, SEEK_SET) == -1) { - printf("Cannot seek to real block device footer\n"); - goto errout; - } - - if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { - printf("Cannot write real block device footer\n"); - goto errout; - } - - fstat(fd, &statbuf); - /* If the keys are kept on a raw block device, do not try to truncate it. */ - if (S_ISREG(statbuf.st_mode)) { - if (ftruncate(fd, 0x4000)) { - printf("Cannot set footer file size\n", fname); - goto errout; - } - } - - /* Success! */ - rc = 0; - -errout: - close(fd); - return rc; - -} - -static inline int unix_read(int fd, void* buff, int len) -{ - return TEMP_FAILURE_RETRY(read(fd, buff, len)); -} - -static inline int unix_write(int fd, const void* buff, int len) -{ - return TEMP_FAILURE_RETRY(write(fd, buff, len)); -} - -static void init_empty_persist_data(struct crypt_persist_data *pdata, int len) -{ - memset(pdata, 0, len); - pdata->persist_magic = PERSIST_DATA_MAGIC; - pdata->persist_valid_entries = 0; -} - -/* A routine to update the passed in crypt_ftr to the lastest version. - * fd is open read/write on the device that holds the crypto footer and persistent - * data, crypt_ftr is a pointer to the struct to be updated, and offset is the - * absolute offset to the start of the crypt_mnt_ftr on the passed in fd. - */ -static void upgrade_crypt_ftr(int fd, struct crypt_mnt_ftr *crypt_ftr, off64_t offset) -{ - int orig_major = crypt_ftr->major_version; - int orig_minor = crypt_ftr->minor_version; - return; // in recovery we don't want to upgrade - if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 0)) { - struct crypt_persist_data *pdata; - off64_t pdata_offset = offset + CRYPT_FOOTER_TO_PERSIST_OFFSET; - - printf("upgrading crypto footer to 1.1"); - - pdata = malloc(CRYPT_PERSIST_DATA_SIZE); - if (pdata == NULL) { - printf("Cannot allocate persisent data\n"); - return; - } - memset(pdata, 0, CRYPT_PERSIST_DATA_SIZE); - - /* Need to initialize the persistent data area */ - if (lseek64(fd, pdata_offset, SEEK_SET) == -1) { - printf("Cannot seek to persisent data offset\n"); - return; - } - /* Write all zeros to the first copy, making it invalid */ - unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); - - /* Write a valid but empty structure to the second copy */ - init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); - unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); - - /* Update the footer */ - crypt_ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; - crypt_ftr->persist_data_offset[0] = pdata_offset; - crypt_ftr->persist_data_offset[1] = pdata_offset + CRYPT_PERSIST_DATA_SIZE; - crypt_ftr->minor_version = 1; - } - - if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version)) { - printf("upgrading crypto footer to 1.2"); - crypt_ftr->kdf_type = KDF_PBKDF2; - get_device_scrypt_params(crypt_ftr); - crypt_ftr->minor_version = 2; - } - - if ((orig_major != crypt_ftr->major_version) || (orig_minor != crypt_ftr->minor_version)) { - if (lseek64(fd, offset, SEEK_SET) == -1) { - printf("Cannot seek to crypt footer\n"); - return; - } - unix_write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr)); - } -} - - -static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) -{ - int fd; - unsigned int nr_sec, cnt; - off64_t starting_off; - int rc = -1; - char *fname = NULL; - struct stat statbuf; - - if (get_crypt_ftr_info(&fname, &starting_off)) { - printf("Unable to get crypt_ftr_info\n"); - return -1; - } - if (fname[0] != '/') { - printf("Unexpected value for crypto key location\n"); - return -1; - } - if ( (fd = open(fname, O_RDWR)) < 0) { - printf("Cannot open footer file %s for get\n", fname); - return -1; - } - - /* Make sure it's 16 Kbytes in length */ - fstat(fd, &statbuf); - if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { - printf("footer file %s is not the expected size!\n", fname); - goto errout; - } - - /* Seek to the start of the crypt footer */ - if (lseek64(fd, starting_off, SEEK_SET) == -1) { - printf("Cannot seek to real block device footer\n"); - goto errout; - } - - if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { - printf("Cannot read real block device footer\n"); - goto errout; - } - - if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { - printf("Bad magic for real block device %s\n", fname); - goto errout; - } - - if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) { - printf("Cannot understand major version %d real block device footer; expected %d\n", - crypt_ftr->major_version, CURRENT_MAJOR_VERSION); - goto errout; - } - - if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) { - printf("Warning: crypto footer minor version %d, expected <= %d, continuing...\n", - crypt_ftr->minor_version, CURRENT_MINOR_VERSION); - } - - /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the - * copy on disk before returning. - */ - /*if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) { - upgrade_crypt_ftr(fd, crypt_ftr, starting_off); - }*/ - - /* Success! */ - rc = 0; - -errout: - close(fd); - return rc; -} - -static int validate_persistent_data_storage(struct crypt_mnt_ftr *crypt_ftr) -{ - if (crypt_ftr->persist_data_offset[0] + crypt_ftr->persist_data_size > - crypt_ftr->persist_data_offset[1]) { - printf("Crypt_ftr persist data regions overlap"); - return -1; - } - - if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) { - printf("Crypt_ftr persist data region 0 starts after region 1"); - return -1; - } - - if (((crypt_ftr->persist_data_offset[1] + crypt_ftr->persist_data_size) - - (crypt_ftr->persist_data_offset[0] - CRYPT_FOOTER_TO_PERSIST_OFFSET)) > - CRYPT_FOOTER_OFFSET) { - printf("Persistent data extends past crypto footer"); - return -1; - } - - return 0; -} - -static int load_persistent_data(void) -{ - struct crypt_mnt_ftr crypt_ftr; - struct crypt_persist_data *pdata = NULL; - char encrypted_state[PROPERTY_VALUE_MAX]; - char *fname; - int found = 0; - int fd; - int ret; - int i; - - if (persist_data) { - /* Nothing to do, we've already loaded or initialized it */ - return 0; - } - - - /* If not encrypted, just allocate an empty table and initialize it */ - property_get("ro.crypto.state", encrypted_state, ""); - if (strcmp(encrypted_state, "encrypted") ) { - pdata = malloc(CRYPT_PERSIST_DATA_SIZE); - if (pdata) { - init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); - persist_data = pdata; - return 0; - } - return -1; - } - - if(get_crypt_ftr_and_key(&crypt_ftr)) { - return -1; - } - - if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) { - printf("Crypt_ftr version doesn't support persistent data"); - return -1; - } - - if (get_crypt_ftr_info(&fname, NULL)) { - return -1; - } - - ret = validate_persistent_data_storage(&crypt_ftr); - if (ret) { - return -1; - } - - fd = open(fname, O_RDONLY); - if (fd < 0) { - printf("Cannot open %s metadata file", fname); - return -1; - } - - if (persist_data == NULL) { - pdata = malloc(crypt_ftr.persist_data_size); - if (pdata == NULL) { - printf("Cannot allocate memory for persistent data"); - goto err; - } - } - - for (i = 0; i < 2; i++) { - if (lseek64(fd, crypt_ftr.persist_data_offset[i], SEEK_SET) < 0) { - printf("Cannot seek to read persistent data on %s", fname); - goto err2; - } - if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){ - printf("Error reading persistent data on iteration %d", i); - goto err2; - } - if (pdata->persist_magic == PERSIST_DATA_MAGIC) { - found = 1; - break; - } - } - - if (!found) { - printf("Could not find valid persistent data, creating"); - init_empty_persist_data(pdata, crypt_ftr.persist_data_size); - } - - /* Success */ - persist_data = pdata; - close(fd); - return 0; - -err2: - free(pdata); - -err: - close(fd); - return -1; -} - -static int save_persistent_data(void) -{ - struct crypt_mnt_ftr crypt_ftr; - struct crypt_persist_data *pdata; - char *fname; - off64_t write_offset; - off64_t erase_offset; - int found = 0; - int fd; - int ret; - - if (persist_data == NULL) { - printf("No persistent data to save"); - return -1; - } - - if(get_crypt_ftr_and_key(&crypt_ftr)) { - return -1; - } - - if ((crypt_ftr.major_version != 1) || (crypt_ftr.minor_version != 1)) { - printf("Crypt_ftr version doesn't support persistent data"); - return -1; - } - - ret = validate_persistent_data_storage(&crypt_ftr); - if (ret) { - return -1; - } - - if (get_crypt_ftr_info(&fname, NULL)) { - return -1; - } - - fd = open(fname, O_RDWR); - if (fd < 0) { - printf("Cannot open %s metadata file", fname); - return -1; - } - - pdata = malloc(crypt_ftr.persist_data_size); - if (pdata == NULL) { - printf("Cannot allocate persistant data"); - goto err; - } - - if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) { - printf("Cannot seek to read persistent data on %s", fname); - goto err2; - } - - if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) { - printf("Error reading persistent data before save"); - goto err2; - } - - if (pdata->persist_magic == PERSIST_DATA_MAGIC) { - /* The first copy is the curent valid copy, so write to - * the second copy and erase this one */ - write_offset = crypt_ftr.persist_data_offset[1]; - erase_offset = crypt_ftr.persist_data_offset[0]; - } else { - /* The second copy must be the valid copy, so write to - * the first copy, and erase the second */ - write_offset = crypt_ftr.persist_data_offset[0]; - erase_offset = crypt_ftr.persist_data_offset[1]; - } - - /* Write the new copy first, if successful, then erase the old copy */ - if (lseek(fd, write_offset, SEEK_SET) < 0) { - printf("Cannot seek to write persistent data"); - goto err2; - } - if (unix_write(fd, persist_data, crypt_ftr.persist_data_size) == - (int) crypt_ftr.persist_data_size) { - if (lseek(fd, erase_offset, SEEK_SET) < 0) { - printf("Cannot seek to erase previous persistent data"); - goto err2; - } - fsync(fd); - memset(pdata, 0, crypt_ftr.persist_data_size); - if (unix_write(fd, pdata, crypt_ftr.persist_data_size) != - (int) crypt_ftr.persist_data_size) { - printf("Cannot write to erase previous persistent data"); - goto err2; - } - fsync(fd); - } else { - printf("Cannot write to save persistent data"); - goto err2; - } - - /* Success */ - free(pdata); - close(fd); - return 0; - -err2: - free(pdata); -err: - close(fd); - return -1; -} - -/* Convert a binary key of specified length into an ascii hex string equivalent, - * without the leading 0x and with null termination - */ -void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, - char *master_key_ascii) -{ - unsigned int i, a; - unsigned char nibble; - - for (i=0, a=0; i<keysize; i++, a+=2) { - /* For each byte, write out two ascii hex digits */ - nibble = (master_key[i] >> 4) & 0xf; - master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); - - nibble = master_key[i] & 0xf; - master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); - } - - /* Add the null termination */ - master_key_ascii[a] = '\0'; - -} - -static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, - char *real_blk_name, const char *name, int fd, - char *extra_params) -{ - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - struct dm_target_spec *tgt; - char *crypt_params; - char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ - int i; - - io = (struct dm_ioctl *) buffer; - - /* Load the mapping table for this device */ - tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - io->target_count = 1; - tgt->status = 0; - tgt->sector_start = 0; - tgt->length = crypt_ftr->fs_size; - strcpy(tgt->target_type, "crypt"); - - crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); - convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); - sprintf(crypt_params, "%s %s 0 %s 0 %s", crypt_ftr->crypto_type_name, - master_key_ascii, real_blk_name, extra_params); - crypt_params += strlen(crypt_params) + 1; - crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ - tgt->next = crypt_params - buffer; - - for (i = 0; i < TABLE_LOAD_RETRIES; i++) { - if (! ioctl(fd, DM_TABLE_LOAD, io)) { - break; - } - usleep(500000); - } - - if (i == TABLE_LOAD_RETRIES) { - /* We failed to load the table, return an error */ - return -1; - } else { - return i + 1; - } -} - - -static int get_dm_crypt_version(int fd, const char *name, int *version) -{ - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - struct dm_target_versions *v; - int i; - - io = (struct dm_ioctl *) buffer; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - - if (ioctl(fd, DM_LIST_VERSIONS, io)) { - return -1; - } - - /* Iterate over the returned versions, looking for name of "crypt". - * When found, get and return the version. - */ - v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)]; - while (v->next) { - if (! strcmp(v->name, "crypt")) { - /* We found the crypt driver, return the version, and get out */ - version[0] = v->version[0]; - version[1] = v->version[1]; - version[2] = v->version[2]; - return 0; - } - v = (struct dm_target_versions *)(((char *)v) + v->next); - } - - return -1; -} - -static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, - char *real_blk_name, char *crypto_blk_name, const char *name) -{ - char buffer[DM_CRYPT_BUF_SIZE]; - char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ - char *crypt_params; - struct dm_ioctl *io; - struct dm_target_spec *tgt; - unsigned int minor; - int fd; - int i; - int retval = -1; - int version[3]; - char *extra_params; - int load_count; - - if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { - printf("Cannot open device-mapper\n"); - goto errout; - } - - io = (struct dm_ioctl *) buffer; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_CREATE, io)) { - printf("Cannot create dm-crypt device\n"); - goto errout; - } - - /* Get the device status, in particular, the name of it's device file */ - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_STATUS, io)) { - printf("Cannot retrieve dm-crypt device status\n"); - goto errout; - } - minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); - snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); - - extra_params = ""; - if (! get_dm_crypt_version(fd, name, version)) { - /* Support for allow_discards was added in version 1.11.0 */ - if ((version[0] >= 2) || - ((version[0] == 1) && (version[1] >= 11))) { - extra_params = "1 allow_discards"; - printf("Enabling support for allow_discards in dmcrypt.\n"); - } - } - - load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name, - fd, extra_params); - if (load_count < 0) { - printf("Cannot load dm-crypt mapping table.\n"); - goto errout; - } else if (load_count > 1) { - printf("Took %d tries to load dmcrypt table.\n", load_count); - } - - /* Resume this device to activate it */ - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - - if (ioctl(fd, DM_DEV_SUSPEND, io)) { - printf("Cannot resume the dm-crypt device\n"); - goto errout; - } - - /* We made it here with no errors. Woot! */ - retval = 0; - -errout: - close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ - - return retval; -} - -static int delete_crypto_blk_dev(char *name) -{ - int fd; - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - int retval = -1; - - if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { - printf("Cannot open device-mapper\n"); - goto errout; - } - - io = (struct dm_ioctl *) buffer; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_REMOVE, io)) { - printf("Cannot remove dm-crypt device\n"); - goto errout; - } - - /* We made it here with no errors. Woot! */ - retval = 0; - -errout: - close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ - - return retval; - -} - -static void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey, void *params) { - /* Turn the password into a key and IV that can decrypt the master key */ - PKCS5_PBKDF2_HMAC_SHA1(passwd, strlen(passwd), salt, SALT_LEN, - HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); -} - -static void scrypt(char *passwd, unsigned char *salt, unsigned char *ikey, void *params) { - struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; - - int N = 1 << ftr->N_factor; - int r = 1 << ftr->r_factor; - int p = 1 << ftr->p_factor; - - /* Turn the password into a key and IV that can decrypt the master key */ - crypto_scrypt((unsigned char *) passwd, strlen(passwd), salt, SALT_LEN, N, r, p, ikey, - KEY_LEN_BYTES + IV_LEN_BYTES); -} - -static int encrypt_master_key(char *passwd, unsigned char *salt, - unsigned char *decrypted_master_key, - unsigned char *encrypted_master_key, - struct crypt_mnt_ftr *crypt_ftr) -{ - unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ - EVP_CIPHER_CTX e_ctx; - int encrypted_len, final_len; - - /* Turn the password into a key and IV that can decrypt the master key */ - get_device_scrypt_params(crypt_ftr); - scrypt(passwd, salt, ikey, crypt_ftr); - - /* Initialize the decryption engine */ - if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { - printf("EVP_EncryptInit failed\n"); - return -1; - } - EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ - - /* Encrypt the master key */ - if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, - decrypted_master_key, KEY_LEN_BYTES)) { - printf("EVP_EncryptUpdate failed\n"); - return -1; - } - if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { - printf("EVP_EncryptFinal failed\n"); - return -1; - } - - if (encrypted_len + final_len != KEY_LEN_BYTES) { - printf("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); - return -1; - } else { - return 0; - } -} - -static int decrypt_master_key(char *passwd, unsigned char *salt, - unsigned char *encrypted_master_key, - unsigned char *decrypted_master_key, - kdf_func kdf, void *kdf_params) -{ - unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ - EVP_CIPHER_CTX d_ctx; - int decrypted_len, final_len; - - /* Turn the password into a key and IV that can decrypt the master key */ - kdf(passwd, salt, ikey, kdf_params); - - /* Initialize the decryption engine */ - if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { - return -1; - } - EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ - /* Decrypt the master key */ - if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, - encrypted_master_key, KEY_LEN_BYTES)) { - return -1; - } - if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { - return -1; - } - - if (decrypted_len + final_len != KEY_LEN_BYTES) { - return -1; - } else { - return 0; - } -} - -static void get_kdf_func(struct crypt_mnt_ftr *ftr, kdf_func *kdf, void** kdf_params) -{ - if (ftr->kdf_type == KDF_SCRYPT) { - *kdf = scrypt; - *kdf_params = ftr; - } else { - *kdf = pbkdf2; - *kdf_params = NULL; - } -} - -static int decrypt_master_key_and_upgrade(char *passwd, unsigned char *decrypted_master_key, - struct crypt_mnt_ftr *crypt_ftr) -{ - kdf_func kdf; - void *kdf_params; - int ret; - - get_kdf_func(crypt_ftr, &kdf, &kdf_params); - ret = decrypt_master_key(passwd, crypt_ftr->salt, crypt_ftr->master_key, decrypted_master_key, kdf, - kdf_params); - if (ret != 0) { - printf("failure decrypting master key"); - return ret; - } - - /* - * Upgrade if we're not using the latest KDF. - */ - /*if (crypt_ftr->kdf_type != KDF_SCRYPT) { - crypt_ftr->kdf_type = KDF_SCRYPT; - encrypt_master_key(passwd, crypt_ftr->salt, decrypted_master_key, crypt_ftr->master_key, - crypt_ftr); - put_crypt_ftr_and_key(crypt_ftr); - }*/ - - return ret; -} - -static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt, - struct crypt_mnt_ftr *crypt_ftr) { - int fd; - unsigned char key_buf[KEY_LEN_BYTES]; - EVP_CIPHER_CTX e_ctx; - int encrypted_len, final_len; - - /* Get some random bits for a key */ - fd = open("/dev/urandom", O_RDONLY); - read(fd, key_buf, sizeof(key_buf)); - read(fd, salt, SALT_LEN); - close(fd); - - /* Now encrypt it with the password */ - return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr); -} - -static int wait_and_unmount(char *mountpoint) -{ - int i, rc; -#define WAIT_UNMOUNT_COUNT 20 - - /* Now umount the tmpfs filesystem */ - for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { - if (umount(mountpoint)) { - if (errno == EINVAL) { - /* EINVAL is returned if the directory is not a mountpoint, - * i.e. there is no filesystem mounted there. So just get out. - */ - break; - } - sleep(1); - i++; - } else { - break; - } - } - - if (i < WAIT_UNMOUNT_COUNT) { - printf("unmounting %s succeeded\n", mountpoint); - rc = 0; - } else { - printf("unmounting %s failed\n", mountpoint); - rc = -1; - } - - return rc; -} - -#define DATA_PREP_TIMEOUT 200 -static int prep_data_fs(void) -{ - int i; - - /* Do the prep of the /data filesystem */ - property_set("vold.post_fs_data_done", "0"); - property_set("vold.decrypt", "trigger_post_fs_data"); - printf("Just triggered post_fs_data\n"); - - /* Wait a max of 50 seconds, hopefully it takes much less */ - for (i=0; i<DATA_PREP_TIMEOUT; i++) { - char p[PROPERTY_VALUE_MAX]; - - property_get("vold.post_fs_data_done", p, "0"); - if (*p == '1') { - break; - } else { - usleep(250000); - } - } - if (i == DATA_PREP_TIMEOUT) { - /* Ugh, we failed to prep /data in time. Bail. */ - printf("post_fs_data timed out!\n"); - return -1; - } else { - printf("post_fs_data done\n"); - return 0; - } -} - -int cryptfs_restart(void) -{ - char fs_type[32]; - char real_blkdev[MAXPATHLEN]; - char crypto_blkdev[MAXPATHLEN]; - char fs_options[256]; - unsigned long mnt_flags; - struct stat statbuf; - int rc = -1, i; - static int restart_successful = 0; - - /* Validate that it's OK to call this routine */ - if (! master_key_saved) { - printf("Encrypted filesystem not validated, aborting"); - return -1; - } - - if (restart_successful) { - printf("System already restarted with encrypted disk, aborting"); - return -1; - } - - /* Here is where we shut down the framework. The init scripts - * start all services in one of three classes: core, main or late_start. - * On boot, we start core and main. Now, we stop main, but not core, - * as core includes vold and a few other really important things that - * we need to keep running. Once main has stopped, we should be able - * to umount the tmpfs /data, then mount the encrypted /data. - * We then restart the class main, and also the class late_start. - * At the moment, I've only put a few things in late_start that I know - * are not needed to bring up the framework, and that also cause problems - * with unmounting the tmpfs /data, but I hope to add add more services - * to the late_start class as we optimize this to decrease the delay - * till the user is asked for the password to the filesystem. - */ - - /* The init files are setup to stop the class main when vold.decrypt is - * set to trigger_reset_main. - */ - property_set("vold.decrypt", "trigger_reset_main"); - printf("Just asked init to shut down class main\n"); - - /* Ugh, shutting down the framework is not synchronous, so until it - * can be fixed, this horrible hack will wait a moment for it all to - * shut down before proceeding. Without it, some devices cannot - * restart the graphics services. - */ - sleep(2); - - /* Now that the framework is shutdown, we should be able to umount() - * the tmpfs filesystem, and mount the real one. - */ - - property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); - if (strlen(crypto_blkdev) == 0) { - printf("fs_crypto_blkdev not set\n"); - return -1; - } - - if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { - /* If that succeeded, then mount the decrypted filesystem */ - fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, 0); - - property_set("vold.decrypt", "trigger_load_persist_props"); - /* Create necessary paths on /data */ - if (prep_data_fs()) { - return -1; - } - - /* startup service classes main and late_start */ - property_set("vold.decrypt", "trigger_restart_framework"); - printf("Just triggered restart_framework\n"); - - /* Give it a few moments to get started */ - sleep(1); - } - - if (rc == 0) { - restart_successful = 1; - } - - return rc; -} - -static int do_crypto_complete(char *mount_point) -{ - struct crypt_mnt_ftr crypt_ftr; - char encrypted_state[PROPERTY_VALUE_MAX]; - char key_loc[PROPERTY_VALUE_MAX]; - - property_get("ro.crypto.state", encrypted_state, ""); - if (strcmp(encrypted_state, "encrypted") ) { - printf("not running with encryption, aborting"); - return 1; - } - - if (get_crypt_ftr_and_key(&crypt_ftr)) { - fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); - - /* - * Only report this error if key_loc is a file and it exists. - * If the device was never encrypted, and /data is not mountable for - * some reason, returning 1 should prevent the UI from presenting the - * a "enter password" screen, or worse, a "press button to wipe the - * device" screen. - */ - if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) { - printf("master key file does not exist, aborting"); - return 1; - } else { - printf("Error getting crypt footer and key\n"); - return -1; - } - } - - if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS) { - printf("Encryption process didn't finish successfully\n"); - return -2; /* -2 is the clue to the UI that there is no usable data on the disk, - * and give the user an option to wipe the disk */ - } - - /* We passed the test! We shall diminish, and return to the west */ - return 0; -} - -static int test_mount_encrypted_fs(char *passwd, char *mount_point, char *label) -{ - struct crypt_mnt_ftr crypt_ftr; - /* Allocate enough space for a 256 bit key, but we may use less */ - unsigned char decrypted_master_key[32]; - char crypto_blkdev[MAXPATHLEN]; - char real_blkdev[MAXPATHLEN]; - char tmp_mount_point[64]; - unsigned int orig_failed_decrypt_count; - char encrypted_state[PROPERTY_VALUE_MAX]; - int rc; - kdf_func kdf; - void *kdf_params; - - property_get("ro.crypto.state", encrypted_state, ""); - if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { - printf("encrypted fs already validated or not running with encryption, aborting"); - return -1; - } - - fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); - - if (get_crypt_ftr_and_key(&crypt_ftr)) { - printf("Error getting crypt footer and key\n"); - return -1; - } - - printf("crypt_ftr->fs_size = %lld\n", crypt_ftr.fs_size); - orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count; - - if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { - decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr); - } - - if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, - real_blkdev, crypto_blkdev, label)) { - printf("Error creating decrypted block device\n"); - return -1; - } - - /* If init detects an encrypted filesystem, it writes a file for each such - * encrypted fs into the tmpfs /data filesystem, and then the framework finds those - * files and passes that data to me */ - /* Create a tmp mount point to try mounting the decryptd fs - * Since we're here, the mount_point should be a tmpfs filesystem, so make - * a directory in it to test mount the decrypted filesystem. - */ - sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); - mkdir(tmp_mount_point, 0755); - if (fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) { - printf("Error temp mounting decrypted block device\n"); - delete_crypto_blk_dev(label); - crypt_ftr.failed_decrypt_count++; - } else { - /* Success, so just umount and we'll mount it properly when we restart - * the framework. - */ - umount(tmp_mount_point); - crypt_ftr.failed_decrypt_count = 0; - } - - if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) { - put_crypt_ftr_and_key(&crypt_ftr); - } - - if (crypt_ftr.failed_decrypt_count) { - /* We failed to mount the device, so return an error */ - rc = crypt_ftr.failed_decrypt_count; - - } else { - /* Woot! Success! Save the name of the crypto block device - * so we can mount it when restarting the framework. - */ - property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); - - /* Also save a the master key so we can reencrypted the key - * the key when we want to change the password on it. - */ - memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES); - saved_mount_point = strdup(mount_point); - master_key_saved = 1; - rc = 0; - } - - return rc; -} - -/* Called by vold when it wants to undo the crypto mapping of a volume it - * manages. This is usually in response to a factory reset, when we want - * to undo the crypto mapping so the volume is formatted in the clear. - */ -int cryptfs_revert_volume(const char *label) -{ - return delete_crypto_blk_dev((char *)label); -} - -/* - * Called by vold when it's asked to mount an encrypted, nonremovable volume. - * Setup a dm-crypt mapping, use the saved master key from - * setting up the /data mapping, and return the new device path. - */ -int cryptfs_setup_volume(const char *label, int major, int minor, - char *crypto_sys_path, unsigned int max_path, - int *new_major, int *new_minor) -{ - char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN]; - struct crypt_mnt_ftr sd_crypt_ftr; - struct stat statbuf; - int nr_sec, fd; - - sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor); - - get_crypt_ftr_and_key(&sd_crypt_ftr); - - /* Update the fs_size field to be the size of the volume */ - fd = open(real_blkdev, O_RDONLY); - nr_sec = get_blkdev_size(fd); - close(fd); - if (nr_sec == 0) { - printf("Cannot get size of volume %s\n", real_blkdev); - return -1; - } - - sd_crypt_ftr.fs_size = nr_sec; - create_crypto_blk_dev(&sd_crypt_ftr, saved_master_key, real_blkdev, - crypto_blkdev, label); - - stat(crypto_blkdev, &statbuf); - *new_major = MAJOR(statbuf.st_rdev); - *new_minor = MINOR(statbuf.st_rdev); - - /* Create path to sys entry for this block device */ - snprintf(crypto_sys_path, max_path, "/devices/virtual/block/%s", strrchr(crypto_blkdev, '/')+1); - - return 0; -} - -int cryptfs_crypto_complete(void) -{ - return do_crypto_complete("/data"); -} - -#define FSTAB_PREFIX "/fstab." - -int cryptfs_check_footer(void) -{ - int rc = -1; - char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)]; - char propbuf[PROPERTY_VALUE_MAX]; - struct crypt_mnt_ftr crypt_ftr; - - property_get("ro.hardware", propbuf, ""); - snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf); - - fstab = fs_mgr_read_fstab(fstab_filename); - if (!fstab) { - printf("failed to open %s\n", fstab_filename); - return -1; - } - - rc = get_crypt_ftr_and_key(&crypt_ftr); - - return rc; -} - -int cryptfs_check_passwd(char *passwd) -{ - int rc = -1; - char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)]; - char propbuf[PROPERTY_VALUE_MAX]; - - property_get("ro.hardware", propbuf, ""); - snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf); - - fstab = fs_mgr_read_fstab(fstab_filename); - if (!fstab) { - printf("failed to open %s\n", fstab_filename); - return -1; - } - - rc = test_mount_encrypted_fs(passwd, DATA_MNT_POINT, "userdata"); - - return rc; -} - -int cryptfs_verify_passwd(char *passwd) -{ - struct crypt_mnt_ftr crypt_ftr; - /* Allocate enough space for a 256 bit key, but we may use less */ - unsigned char decrypted_master_key[32]; - char encrypted_state[PROPERTY_VALUE_MAX]; - int rc; - - property_get("ro.crypto.state", encrypted_state, ""); - if (strcmp(encrypted_state, "encrypted") ) { - printf("device not encrypted, aborting"); - return -2; - } - - if (!master_key_saved) { - printf("encrypted fs not yet mounted, aborting"); - return -1; - } - - if (!saved_mount_point) { - printf("encrypted fs failed to save mount point, aborting"); - return -1; - } - - if (get_crypt_ftr_and_key(&crypt_ftr)) { - printf("Error getting crypt footer and key\n"); - return -1; - } - - if (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) { - /* If the device has no password, then just say the password is valid */ - rc = 0; - } else { - decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr); - if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) { - /* They match, the password is correct */ - rc = 0; - } else { - /* If incorrect, sleep for a bit to prevent dictionary attacks */ - sleep(1); - rc = 1; - } - } - - return rc; -} - -/* Initialize a crypt_mnt_ftr structure. The keysize is - * defaulted to 16 bytes, and the filesystem size to 0. - * Presumably, at a minimum, the caller will update the - * filesystem size and crypto_type_name after calling this function. - */ -static void cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) -{ - off64_t off; - - memset(ftr, 0, sizeof(struct crypt_mnt_ftr)); - ftr->magic = CRYPT_MNT_MAGIC; - ftr->major_version = CURRENT_MAJOR_VERSION; - ftr->minor_version = CURRENT_MINOR_VERSION; - ftr->ftr_size = sizeof(struct crypt_mnt_ftr); - ftr->keysize = KEY_LEN_BYTES; - - ftr->kdf_type = KDF_SCRYPT; - get_device_scrypt_params(ftr); - - ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; - if (get_crypt_ftr_info(NULL, &off) == 0) { - ftr->persist_data_offset[0] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET; - ftr->persist_data_offset[1] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET + - ftr->persist_data_size; - } -} - -static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type) -{ - return -1; -} - -#define CRYPT_INPLACE_BUFSIZE 4096 -#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / 512) -static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, off64_t size, - off64_t *size_already_done, off64_t tot_size) -{ - int realfd, cryptofd; - char *buf[CRYPT_INPLACE_BUFSIZE]; - int rc = -1; - off64_t numblocks, i, remainder; - off64_t one_pct, cur_pct, new_pct; - off64_t blocks_already_done, tot_numblocks; - - if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { - printf("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); - return -1; - } - - if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { - printf("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); - close(realfd); - return -1; - } - - /* This is pretty much a simple loop of reading 4K, and writing 4K. - * The size passed in is the number of 512 byte sectors in the filesystem. - * So compute the number of whole 4K blocks we should read/write, - * and the remainder. - */ - numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; - remainder = size % CRYPT_SECTORS_PER_BUFSIZE; - tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; - blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; - - printf("Encrypting filesystem in place..."); - - one_pct = tot_numblocks / 100; - cur_pct = 0; - /* process the majority of the filesystem in blocks */ - for (i=0; i<numblocks; i++) { - new_pct = (i + blocks_already_done) / one_pct; - if (new_pct > cur_pct) { - char buf[8]; - - cur_pct = new_pct; - snprintf(buf, sizeof(buf), "%lld", cur_pct); - property_set("vold.encrypt_progress", buf); - } - if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { - printf("Error reading real_blkdev %s for inplace encrypt\n", crypto_blkdev); - goto errout; - } - if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { - printf("Error writing crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); - goto errout; - } - } - - /* Do any remaining sectors */ - for (i=0; i<remainder; i++) { - if (unix_read(realfd, buf, 512) <= 0) { - printf("Error reading rival sectors from real_blkdev %s for inplace encrypt\n", crypto_blkdev); - goto errout; - } - if (unix_write(cryptofd, buf, 512) <= 0) { - printf("Error writing final sectors to crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); - goto errout; - } - } - - *size_already_done += size; - rc = 0; - -errout: - close(realfd); - close(cryptofd); - - return rc; -} - -#define CRYPTO_ENABLE_WIPE 1 -#define CRYPTO_ENABLE_INPLACE 2 - -#define FRAMEWORK_BOOT_WAIT 60 - -static inline int should_encrypt(struct volume_info *volume) -{ - return (volume->flags & (VOL_ENCRYPTABLE | VOL_NONREMOVABLE)) == - (VOL_ENCRYPTABLE | VOL_NONREMOVABLE); -} - -int cryptfs_enable(char *howarg, char *passwd) -{ - return -1; -} - -int cryptfs_changepw(char *newpw) -{ - struct crypt_mnt_ftr crypt_ftr; - unsigned char decrypted_master_key[KEY_LEN_BYTES]; - - /* This is only allowed after we've successfully decrypted the master key */ - if (! master_key_saved) { - printf("Key not saved, aborting"); - return -1; - } - - /* get key */ - if (get_crypt_ftr_and_key(&crypt_ftr)) { - printf("Error getting crypt footer and key"); - return -1; - } - - encrypt_master_key(newpw, crypt_ftr.salt, saved_master_key, crypt_ftr.master_key, &crypt_ftr); - - /* save the key */ - put_crypt_ftr_and_key(&crypt_ftr); - - return 0; -} - -static int persist_get_key(char *fieldname, char *value) -{ - unsigned int i; - - if (persist_data == NULL) { - return -1; - } - for (i = 0; i < persist_data->persist_valid_entries; i++) { - if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { - /* We found it! */ - strlcpy(value, persist_data->persist_entry[i].val, PROPERTY_VALUE_MAX); - return 0; - } - } - - return -1; -} - -static int persist_set_key(char *fieldname, char *value, int encrypted) -{ - unsigned int i; - unsigned int num; - struct crypt_mnt_ftr crypt_ftr; - unsigned int max_persistent_entries; - unsigned int dsize; - - if (persist_data == NULL) { - return -1; - } - - /* If encrypted, use the values from the crypt_ftr, otherwise - * use the values for the current spec. - */ - if (encrypted) { - if(get_crypt_ftr_and_key(&crypt_ftr)) { - return -1; - } - dsize = crypt_ftr.persist_data_size; - } else { - dsize = CRYPT_PERSIST_DATA_SIZE; - } - max_persistent_entries = (dsize - sizeof(struct crypt_persist_data)) / - sizeof(struct crypt_persist_entry); - - num = persist_data->persist_valid_entries; - - for (i = 0; i < num; i++) { - if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { - /* We found an existing entry, update it! */ - memset(persist_data->persist_entry[i].val, 0, PROPERTY_VALUE_MAX); - strlcpy(persist_data->persist_entry[i].val, value, PROPERTY_VALUE_MAX); - return 0; - } - } - - /* We didn't find it, add it to the end, if there is room */ - if (persist_data->persist_valid_entries < max_persistent_entries) { - memset(&persist_data->persist_entry[num], 0, sizeof(struct crypt_persist_entry)); - strlcpy(persist_data->persist_entry[num].key, fieldname, PROPERTY_KEY_MAX); - strlcpy(persist_data->persist_entry[num].val, value, PROPERTY_VALUE_MAX); - persist_data->persist_valid_entries++; - return 0; - } - - return -1; -} - -/* Return the value of the specified field. */ -int cryptfs_getfield(char *fieldname, char *value, int len) -{ - char temp_value[PROPERTY_VALUE_MAX]; - char real_blkdev[MAXPATHLEN]; - /* 0 is success, 1 is not encrypted, - * -1 is value not set, -2 is any other error - */ - int rc = -2; - - if (persist_data == NULL) { - load_persistent_data(); - if (persist_data == NULL) { - printf("Getfield error, cannot load persistent data"); - goto out; - } - } - - if (!persist_get_key(fieldname, temp_value)) { - /* We found it, copy it to the caller's buffer and return */ - strlcpy(value, temp_value, len); - rc = 0; - } else { - /* Sadness, it's not there. Return the error */ - rc = -1; - } - -out: - return rc; -} - -/* Set the value of the specified field. */ -int cryptfs_setfield(char *fieldname, char *value) -{ - struct crypt_persist_data stored_pdata; - struct crypt_persist_data *pdata_p; - struct crypt_mnt_ftr crypt_ftr; - char encrypted_state[PROPERTY_VALUE_MAX]; - /* 0 is success, -1 is an error */ - int rc = -1; - int encrypted = 0; - - if (persist_data == NULL) { - load_persistent_data(); - if (persist_data == NULL) { - printf("Setfield error, cannot load persistent data"); - goto out; - } - } - - property_get("ro.crypto.state", encrypted_state, ""); - if (!strcmp(encrypted_state, "encrypted") ) { - encrypted = 1; - } - - if (persist_set_key(fieldname, value, encrypted)) { - goto out; - } - - /* If we are running encrypted, save the persistent data now */ - if (encrypted) { - if (save_persistent_data()) { - printf("Setfield error, cannot save persistent data"); - goto out; - } - } - - rc = 0; - -out: - return rc; -} |