diff options
Diffstat (limited to 'crypto/jb/cryptfs.c')
-rw-r--r-- | crypto/jb/cryptfs.c | 1735 |
1 files changed, 1735 insertions, 0 deletions
diff --git a/crypto/jb/cryptfs.c b/crypto/jb/cryptfs.c new file mode 100644 index 000000000..f9c0d7489 --- /dev/null +++ b/crypto/jb/cryptfs.c @@ -0,0 +1,1735 @@ +/* + * 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; +} |