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Diffstat (limited to 'crypto/lollipop/cryptfs.c')
-rw-r--r--crypto/lollipop/cryptfs.c2215
1 files changed, 21 insertions, 2194 deletions
diff --git a/crypto/lollipop/cryptfs.c b/crypto/lollipop/cryptfs.c
index 0277c78ef..90f1523d3 100644
--- a/crypto/lollipop/cryptfs.c
+++ b/crypto/lollipop/cryptfs.c
@@ -37,27 +37,17 @@
#include <sys/mount.h>
#include <openssl/evp.h>
#include <errno.h>
-#include <ext4.h>
#include <linux/kdev_t.h>
-#include <fs_mgr.h>
#include <time.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"
-#include "ext4_utils.h"
-#include "f2fs_sparseblock.h"
-//#include "CheckBattery.h"
-//#include "Process.h"
-
#include <hardware/keymaster.h>
+#ifndef min /* already defined by windows.h */
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
#define UNUSED __attribute__((unused))
#define UNUSED __attribute__((unused))
@@ -91,6 +81,16 @@ 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;
+static char key_fname[PROPERTY_VALUE_MAX] = "";
+static char real_blkdev[PROPERTY_VALUE_MAX] = "";
+static char file_system[PROPERTY_VALUE_MAX] = "";
+
+void set_partition_data(const char* block_device, const char* key_location, const char* fs)
+{
+ strcpy(key_fname, key_location);
+ strcpy(real_blkdev, block_device);
+ strcpy(file_system, fs);
+}
static int keymaster_init(keymaster_device_t **keymaster_dev)
{
@@ -291,31 +291,6 @@ static char* password = 0;
static int password_expiry_time = 0;
static const int password_max_age_seconds = 60;
-struct fstab *fstab;
-
-enum RebootType {reboot, recovery, shutdown};
-static void cryptfs_reboot(enum RebootType rt)
-{
- switch(rt) {
- case reboot:
- property_set(ANDROID_RB_PROPERTY, "reboot");
- break;
-
- case recovery:
- property_set(ANDROID_RB_PROPERTY, "reboot,recovery");
- break;
-
- case shutdown:
- property_set(ANDROID_RB_PROPERTY, "shutdown");
- break;
- }
-
- 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);
@@ -380,41 +355,6 @@ static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) {
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);
-
- if (le32_to_cpu(sb.s_magic) != EXT4_SUPER_MAGIC) {
- printf("Not a valid ext4 superblock");
- return 0;
- }
- 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;
@@ -432,15 +372,12 @@ static int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
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));
- printf("get_crypt_ftr_info crypto key location: '%s'\n", key_loc);
- if (!strcmp(key_loc, KEY_IN_FOOTER)) {
+ printf("get_crypt_ftr_info crypto key location: '%s'\n", key_fname);
+ if (!strcmp(key_fname, KEY_IN_FOOTER)) {
if ( (fd = open(real_blkdev, O_RDWR)) < 0) {
printf("Cannot open real block device %s\n", real_blkdev);
return -1;
@@ -459,7 +396,7 @@ static int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
}
close(fd);
} else {
- strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname));
+ strlcpy(cached_metadata_fname, key_fname, sizeof(cached_metadata_fname));
cached_off = 0;
cached_data = 1;
}
@@ -478,65 +415,6 @@ static int get_crypt_ftr_info(char **metadata_fname, off64_t *off)
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)
-{
- printf("TWRP NOT putting crypt footer and key\n");
- return 0;
- 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");
- 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));
@@ -554,75 +432,6 @@ static void init_empty_persist_data(struct crypt_persist_data *pdata, int len)
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;
-printf("TWRP NOT upgrading crypto footer\n");
-return; // do not upgrade in recovery
- 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 == 1)) {
- printf("upgrading crypto footer to 1.2");
- /* But keep the old kdf_type.
- * It will get updated later to KDF_SCRYPT after the password has been verified.
- */
- crypt_ftr->kdf_type = KDF_PBKDF2;
- get_device_scrypt_params(crypt_ftr);
- crypt_ftr->minor_version = 2;
- }
-
- if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 2)) {
- printf("upgrading crypto footer to 1.3");
- crypt_ftr->crypt_type = CRYPT_TYPE_PASSWORD;
- crypt_ftr->minor_version = 3;
- }
-
- 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;
@@ -682,9 +491,9 @@ static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr)
/* 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) {
+ /*if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) {
upgrade_crypt_ftr(fd, crypt_ftr, starting_off);
- }
+ }*/
/* Success! */
rc = 0;
@@ -694,229 +503,6 @@ errout:
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.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.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;
-}
-
static int hexdigit (char c)
{
if (c >= '0' && c <= '9') return c - '0';
@@ -1424,321 +1010,12 @@ static int decrypt_master_key(char *passwd, unsigned char *decrypted_master_key,
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, bool kill)
-{
- int i, err, rc;
-#define WAIT_UNMOUNT_COUNT 20
-
- /* Now umount the tmpfs filesystem */
- for (i=0; i<WAIT_UNMOUNT_COUNT; i++) {
- if (umount(mountpoint) == 0) {
- break;
- }
-
- 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;
- }
-
- err = errno;
-
- /* If allowed, be increasingly aggressive before the last two retries */
- if (kill) {
- if (i == (WAIT_UNMOUNT_COUNT - 3)) {
- printf("sending SIGHUP to processes with open files\n");
- //vold_killProcessesWithOpenFiles(mountpoint, 1);
- } else if (i == (WAIT_UNMOUNT_COUNT - 2)) {
- printf("sending SIGKILL to processes with open files\n");
- //vold_killProcessesWithOpenFiles(mountpoint, 2);
- }
- }
-
- sleep(1);
- }
-
- if (i < WAIT_UNMOUNT_COUNT) {
- printf("unmounting %s succeeded\n", mountpoint);
- rc = 0;
- } else {
- //vold_killProcessesWithOpenFiles(mountpoint, 0);
- printf("unmounting %s failed: %s\n", mountpoint, strerror(err));
- 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;
- }
-}
-
-static void cryptfs_set_corrupt()
-{
- // Mark the footer as bad
- struct crypt_mnt_ftr crypt_ftr;
- if (get_crypt_ftr_and_key(&crypt_ftr)) {
- printf("Failed to get crypto footer - panic");
- return;
- }
-
- crypt_ftr.flags |= CRYPT_DATA_CORRUPT;
- if (put_crypt_ftr_and_key(&crypt_ftr)) {
- printf("Failed to set crypto footer - panic");
- return;
- }
-}
-
-static void cryptfs_trigger_restart_min_framework()
-{
- if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) {
- printf("Failed to mount tmpfs on data - panic");
- return;
- }
-
- if (property_set("vold.decrypt", "trigger_post_fs_data")) {
- printf("Failed to trigger post fs data - panic");
- return;
- }
-
- if (property_set("vold.decrypt", "trigger_restart_min_framework")) {
- printf("Failed to trigger restart min framework - panic");
- return;
- }
-}
-
-/* returns < 0 on failure */
-static int cryptfs_restart_internal(int restart_main)
-{
- 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;
- }
-
- if (restart_main) {
- /* 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, true)) ) {
- /* If ro.crypto.readonly is set to 1, mount the decrypted
- * filesystem readonly. This is used when /data is mounted by
- * recovery mode.
- */
- char ro_prop[PROPERTY_VALUE_MAX];
- property_get("ro.crypto.readonly", ro_prop, "");
- if (strlen(ro_prop) > 0 && atoi(ro_prop)) {
- struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, DATA_MNT_POINT);
- rec->flags |= MS_RDONLY;
- }
-
- /* If that succeeded, then mount the decrypted filesystem */
- int retries = RETRY_MOUNT_ATTEMPTS;
- int mount_rc;
- while ((mount_rc = fs_mgr_do_mount(fstab, DATA_MNT_POINT,
- crypto_blkdev, 0))
- != 0) {
- if (mount_rc == FS_MGR_DOMNT_BUSY) {
- /* TODO: invoke something similar to
- Process::killProcessWithOpenFiles(DATA_MNT_POINT,
- retries > RETRY_MOUNT_ATTEMPT/2 ? 1 : 2 ) */
- printf("Failed to mount %s because it is busy - waiting",
- crypto_blkdev);
- if (--retries) {
- sleep(RETRY_MOUNT_DELAY_SECONDS);
- } else {
- /* Let's hope that a reboot clears away whatever is keeping
- the mount busy */
- cryptfs_reboot(reboot);
- }
- } else {
- printf("Failed to mount decrypted data");
- cryptfs_set_corrupt();
- cryptfs_trigger_restart_min_framework();
- printf("Started framework to offer wipe");
- return -1;
- }
- }
-
- 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;
-}
-
-int cryptfs_restart(void)
-{
- /* Call internal implementation forcing a restart of main service group */
- return cryptfs_restart_internal(1);
-}
-
-static int do_crypto_complete(char *mount_point UNUSED)
-{
- 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 CRYPTO_COMPLETE_NOT_ENCRYPTED;
- }
-
- 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 CRYPTO_COMPLETE_NOT_ENCRYPTED;
- } else {
- printf("Error getting crypt footer and key\n");
- return CRYPTO_COMPLETE_BAD_METADATA;
- }
- }
-
- // Test for possible error flags
- if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS){
- printf("Encryption process is partway completed\n");
- return CRYPTO_COMPLETE_PARTIAL;
- }
-
- if (crypt_ftr.flags & CRYPT_INCONSISTENT_STATE){
- printf("Encryption process was interrupted but cannot continue\n");
- return CRYPTO_COMPLETE_INCONSISTENT;
- }
-
- if (crypt_ftr.flags & CRYPT_DATA_CORRUPT){
- printf("Encryption is successful but data is corrupt\n");
- return CRYPTO_COMPLETE_CORRUPT;
- }
-
- /* We passed the test! We shall diminish, and return to the west */
- return CRYPTO_COMPLETE_ENCRYPTED;
-}
-
static int test_mount_encrypted_fs(struct crypt_mnt_ftr* crypt_ftr,
char *passwd, char *mount_point, char *label)
{
/* 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;
int rc;
@@ -1761,8 +1038,6 @@ static int test_mount_encrypted_fs(struct crypt_mnt_ftr* crypt_ftr,
}
}
- fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
-
// Create crypto block device - all (non fatal) code paths
// need it
if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key,
@@ -1795,7 +1070,7 @@ static int test_mount_encrypted_fs(struct crypt_mnt_ftr* crypt_ftr,
* the footer, not the key. */
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)) {
+ if (mount(crypto_blkdev, tmp_mount_point, file_system, NULL, NULL) != 0) {
printf("Error temp mounting decrypted block device '%s'\n", crypto_blkdev);
delete_crypto_blk_dev(label);
@@ -1877,52 +1152,6 @@ 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");
-}
-
int check_unmounted_and_get_ftr(struct crypt_mnt_ftr* crypt_ftr)
{
char encrypted_state[PROPERTY_VALUE_MAX];
@@ -2034,24 +1263,11 @@ char* hexadj_passwd(const char* passwd)
return hex;
}
-#define FSTAB_PREFIX "/fstab."
-
-int cryptfs_check_footer(void)
+int cryptfs_check_footer()
{
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;
@@ -2061,17 +1277,6 @@ int cryptfs_check_passwd(char *passwd)
{
struct crypt_mnt_ftr crypt_ftr;
int rc;
- 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 = check_unmounted_and_get_ftr(&crypt_ftr);
if (rc)
@@ -2223,1366 +1428,11 @@ static int cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr)
return 0;
}
-static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type)
-{
- const char *args[10];
- char size_str[32]; /* Must be large enough to hold a %lld and null byte */
- int num_args;
- int status;
- int tmp;
- int rc = -1;
-
- if (type == EXT4_FS) {
- args[0] = "/system/bin/make_ext4fs";
- args[1] = "-a";
- args[2] = "/data";
- args[3] = "-l";
- snprintf(size_str, sizeof(size_str), "%" PRId64, size * 512);
- args[4] = size_str;
- args[5] = crypto_blkdev;
- num_args = 6;
- printf("Making empty filesystem with command %s %s %s %s %s %s\n",
- args[0], args[1], args[2], args[3], args[4], args[5]);
- } else if (type == F2FS_FS) {
- args[0] = "/system/bin/mkfs.f2fs";
- args[1] = "-t";
- args[2] = "-d1";
- args[3] = crypto_blkdev;
- snprintf(size_str, sizeof(size_str), "%" PRId64, size);
- args[4] = size_str;
- num_args = 5;
- printf("Making empty filesystem with command %s %s %s %s %s\n",
- args[0], args[1], args[2], args[3], args[4]);
- } else {
- printf("cryptfs_enable_wipe(): unknown filesystem type %d\n", type);
- return -1;
- }
-
- tmp = android_fork_execvp(num_args, (char **)args, &status, false, true);
-
- if (tmp != 0) {
- printf("Error creating empty filesystem on %s due to logwrap error\n", crypto_blkdev);
- } else {
- if (WIFEXITED(status)) {
- if (WEXITSTATUS(status)) {
- printf("Error creating filesystem on %s, exit status %d ",
- crypto_blkdev, WEXITSTATUS(status));
- } else {
- printf("Successfully created filesystem on %s\n", crypto_blkdev);
- rc = 0;
- }
- } else {
- printf("Error creating filesystem on %s, did not exit normally\n", crypto_blkdev);
- }
- }
-
- return rc;
-}
-
-#define CRYPT_INPLACE_BUFSIZE 4096
-#define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / CRYPT_SECTOR_SIZE)
-#define CRYPT_SECTOR_SIZE 512
-
-/* aligned 32K writes tends to make flash happy.
- * SD card association recommends it.
- */
-#define BLOCKS_AT_A_TIME 8
-
-struct encryptGroupsData
-{
- int realfd;
- int cryptofd;
- off64_t numblocks;
- off64_t one_pct, cur_pct, new_pct;
- off64_t blocks_already_done, tot_numblocks;
- off64_t used_blocks_already_done, tot_used_blocks;
- char* real_blkdev, * crypto_blkdev;
- int count;
- off64_t offset;
- char* buffer;
- off64_t last_written_sector;
- int completed;
- time_t time_started;
- int remaining_time;
-};
-
-static void update_progress(struct encryptGroupsData* data, int is_used)
-{
- data->blocks_already_done++;
-
- if (is_used) {
- data->used_blocks_already_done++;
- }
- if (data->tot_used_blocks) {
- data->new_pct = data->used_blocks_already_done / data->one_pct;
- } else {
- data->new_pct = data->blocks_already_done / data->one_pct;
- }
-
- if (data->new_pct > data->cur_pct) {
- char buf[8];
- data->cur_pct = data->new_pct;
- snprintf(buf, sizeof(buf), "%" PRId64, data->cur_pct);
- property_set("vold.encrypt_progress", buf);
- }
-
- if (data->cur_pct >= 5) {
- struct timespec time_now;
- if (clock_gettime(CLOCK_MONOTONIC, &time_now)) {
- printf("Error getting time");
- } else {
- double elapsed_time = difftime(time_now.tv_sec, data->time_started);
- off64_t remaining_blocks = data->tot_used_blocks
- - data->used_blocks_already_done;
- int remaining_time = (int)(elapsed_time * remaining_blocks
- / data->used_blocks_already_done);
-
- // Change time only if not yet set, lower, or a lot higher for
- // best user experience
- if (data->remaining_time == -1
- || remaining_time < data->remaining_time
- || remaining_time > data->remaining_time + 60) {
- char buf[8];
- snprintf(buf, sizeof(buf), "%d", remaining_time);
- property_set("vold.encrypt_time_remaining", buf);
- data->remaining_time = remaining_time;
- }
- }
- }
-}
-
-static void log_progress(struct encryptGroupsData const* data, bool completed)
-{
- // Precondition - if completed data = 0 else data != 0
-
- // Track progress so we can skip logging blocks
- static off64_t offset = -1;
-
- // Need to close existing 'Encrypting from' log?
- if (completed || (offset != -1 && data->offset != offset)) {
- printf("Encrypted to sector %" PRId64,
- offset / info.block_size * CRYPT_SECTOR_SIZE);
- offset = -1;
- }
-
- // Need to start new 'Encrypting from' log?
- if (!completed && offset != data->offset) {
- printf("Encrypting from sector %" PRId64,
- data->offset / info.block_size * CRYPT_SECTOR_SIZE);
- }
-
- // Update offset
- if (!completed) {
- offset = data->offset + (off64_t)data->count * info.block_size;
- }
-}
-
-static int flush_outstanding_data(struct encryptGroupsData* data)
-{
- if (data->count == 0) {
- return 0;
- }
-
- printf("Copying %d blocks at offset %" PRIx64, data->count, data->offset);
-
- if (pread64(data->realfd, data->buffer,
- info.block_size * data->count, data->offset)
- <= 0) {
- printf("Error reading real_blkdev %s for inplace encrypt",
- data->real_blkdev);
- return -1;
- }
-
- if (pwrite64(data->cryptofd, data->buffer,
- info.block_size * data->count, data->offset)
- <= 0) {
- printf("Error writing crypto_blkdev %s for inplace encrypt",
- data->crypto_blkdev);
- return -1;
- } else {
- log_progress(data, false);
- }
-
- data->count = 0;
- data->last_written_sector = (data->offset + data->count)
- / info.block_size * CRYPT_SECTOR_SIZE - 1;
- return 0;
-}
-
-static int encrypt_groups(struct encryptGroupsData* data)
-{
- unsigned int i;
- u8 *block_bitmap = 0;
- unsigned int block;
- off64_t ret;
- int rc = -1;
-
- data->buffer = malloc(info.block_size * BLOCKS_AT_A_TIME);
- if (!data->buffer) {
- printf("Failed to allocate crypto buffer");
- goto errout;
- }
-
- block_bitmap = malloc(info.block_size);
- if (!block_bitmap) {
- printf("failed to allocate block bitmap");
- goto errout;
- }
-
- for (i = 0; i < aux_info.groups; ++i) {
- printf("Encrypting group %d", i);
-
- u32 first_block = aux_info.first_data_block + i * info.blocks_per_group;
- u32 block_count = min(info.blocks_per_group,
- aux_info.len_blocks - first_block);
-
- off64_t offset = (u64)info.block_size
- * aux_info.bg_desc[i].bg_block_bitmap;
-
- ret = pread64(data->realfd, block_bitmap, info.block_size, offset);
- if (ret != (int)info.block_size) {
- printf("failed to read all of block group bitmap %d", i);
- goto errout;
- }
-
- offset = (u64)info.block_size * first_block;
-
- data->count = 0;
-
- for (block = 0; block < block_count; block++) {
- int used = bitmap_get_bit(block_bitmap, block);
- update_progress(data, used);
- if (used) {
- if (data->count == 0) {
- data->offset = offset;
- }
- data->count++;
- } else {
- if (flush_outstanding_data(data)) {
- goto errout;
- }
- }
-
- offset += info.block_size;
-
- /* Write data if we are aligned or buffer size reached */
- if (offset % (info.block_size * BLOCKS_AT_A_TIME) == 0
- || data->count == BLOCKS_AT_A_TIME) {
- if (flush_outstanding_data(data)) {
- goto errout;
- }
- }
-
- if (1) {
- printf("Stopping encryption due to low battery");
- rc = 0;
- goto errout;
- }
-
- }
- if (flush_outstanding_data(data)) {
- goto errout;
- }
- }
-
- data->completed = 1;
- rc = 0;
-
-errout:
- log_progress(0, true);
- free(data->buffer);
- free(block_bitmap);
- return rc;
-}
-
-static int cryptfs_enable_inplace_ext4(char *crypto_blkdev,
- char *real_blkdev,
- off64_t size,
- off64_t *size_already_done,
- off64_t tot_size,
- off64_t previously_encrypted_upto)
-{
- u32 i;
- struct encryptGroupsData data;
- int rc; // Can't initialize without causing warning -Wclobbered
-
- if (previously_encrypted_upto > *size_already_done) {
- printf("Not fast encrypting since resuming part way through");
- return -1;
- }
-
- memset(&data, 0, sizeof(data));
- data.real_blkdev = real_blkdev;
- data.crypto_blkdev = crypto_blkdev;
-
- if ( (data.realfd = open(real_blkdev, O_RDWR)) < 0) {
- printf("Error opening real_blkdev %s for inplace encrypt. err=%d(%s)\n",
- real_blkdev, errno, strerror(errno));
- rc = -1;
- goto errout;
- }
-
- if ( (data.cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) {
- printf("Error opening crypto_blkdev %s for ext4 inplace encrypt. err=%d(%s)\n",
- crypto_blkdev, errno, strerror(errno));
- rc = ENABLE_INPLACE_ERR_DEV;
- goto errout;
- }
-
- if (setjmp(setjmp_env)) {
- printf("Reading ext4 extent caused an exception\n");
- rc = -1;
- goto errout;
- }
-
- if (read_ext(data.realfd, 0) != 0) {
- printf("Failed to read ext4 extent\n");
- rc = -1;
- goto errout;
- }
-
- data.numblocks = size / CRYPT_SECTORS_PER_BUFSIZE;
- data.tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE;
- data.blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE;
-
- printf("Encrypting ext4 filesystem in place...");
-
- data.tot_used_blocks = data.numblocks;
- for (i = 0; i < aux_info.groups; ++i) {
- data.tot_used_blocks -= aux_info.bg_desc[i].bg_free_blocks_count;
- }
-
- data.one_pct = data.tot_used_blocks / 100;
- data.cur_pct = 0;
-
- struct timespec time_started = {0};
- if (clock_gettime(CLOCK_MONOTONIC, &time_started)) {
- printf("Error getting time at start");
- // Note - continue anyway - we'll run with 0
- }
- data.time_started = time_started.tv_sec;
- data.remaining_time = -1;
-
- rc = encrypt_groups(&data);
- if (rc) {
- printf("Error encrypting groups");
- goto errout;
- }
-
- *size_already_done += data.completed ? size : data.last_written_sector;
- rc = 0;
-
-errout:
- close(data.realfd);
- close(data.cryptofd);
-
- return rc;
-}
-
-static void log_progress_f2fs(u64 block, bool completed)
-{
- // Precondition - if completed data = 0 else data != 0
-
- // Track progress so we can skip logging blocks
- static u64 last_block = (u64)-1;
-
- // Need to close existing 'Encrypting from' log?
- if (completed || (last_block != (u64)-1 && block != last_block + 1)) {
- printf("Encrypted to block %" PRId64, last_block);
- last_block = -1;
- }
-
- // Need to start new 'Encrypting from' log?
- if (!completed && (last_block == (u64)-1 || block != last_block + 1)) {
- printf("Encrypting from block %" PRId64, block);
- }
-
- // Update offset
- if (!completed) {
- last_block = block;
- }
-}
-
-static int encrypt_one_block_f2fs(u64 pos, void *data)
-{
- struct encryptGroupsData *priv_dat = (struct encryptGroupsData *)data;
-
- priv_dat->blocks_already_done = pos - 1;
- update_progress(priv_dat, 1);
-
- off64_t offset = pos * CRYPT_INPLACE_BUFSIZE;
-
- if (pread64(priv_dat->realfd, priv_dat->buffer, CRYPT_INPLACE_BUFSIZE, offset) <= 0) {
- printf("Error reading real_blkdev %s for f2fs inplace encrypt", priv_dat->crypto_blkdev);
- return -1;
- }
-
- if (pwrite64(priv_dat->cryptofd, priv_dat->buffer, CRYPT_INPLACE_BUFSIZE, offset) <= 0) {
- printf("Error writing crypto_blkdev %s for f2fs inplace encrypt", priv_dat->crypto_blkdev);
- return -1;
- } else {
- log_progress_f2fs(pos, false);
- }
-
- return 0;
-}
-
-static int cryptfs_enable_inplace_f2fs(char *crypto_blkdev,
- char *real_blkdev,
- off64_t size,
- off64_t *size_already_done,
- off64_t tot_size,
- off64_t previously_encrypted_upto)
-{
- u32 i;
- struct encryptGroupsData data;
- struct f2fs_info *f2fs_info = NULL;
- int rc = ENABLE_INPLACE_ERR_OTHER;
- if (previously_encrypted_upto > *size_already_done) {
- printf("Not fast encrypting since resuming part way through");
- return ENABLE_INPLACE_ERR_OTHER;
- }
- memset(&data, 0, sizeof(data));
- data.real_blkdev = real_blkdev;
- data.crypto_blkdev = crypto_blkdev;
- data.realfd = -1;
- data.cryptofd = -1;
- if ( (data.realfd = open64(real_blkdev, O_RDWR)) < 0) {
- printf("Error opening real_blkdev %s for f2fs inplace encrypt\n",
- real_blkdev);
- goto errout;
- }
- if ( (data.cryptofd = open64(crypto_blkdev, O_WRONLY)) < 0) {
- printf("Error opening crypto_blkdev %s for f2fs inplace encrypt. err=%d(%s)\n",
- crypto_blkdev, errno, strerror(errno));
- rc = ENABLE_INPLACE_ERR_DEV;
- goto errout;
- }
-
- f2fs_info = generate_f2fs_info(data.realfd);
- if (!f2fs_info)
- goto errout;
-
- data.numblocks = size / CRYPT_SECTORS_PER_BUFSIZE;
- data.tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE;
- data.blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE;
-
- data.tot_used_blocks = get_num_blocks_used(f2fs_info);
-
- data.one_pct = data.tot_used_blocks / 100;
- data.cur_pct = 0;
- data.time_started = time(NULL);
- data.remaining_time = -1;
-
- data.buffer = malloc(f2fs_info->block_size);
- if (!data.buffer) {
- printf("Failed to allocate crypto buffer");
- goto errout;
- }
-
- data.count = 0;
-
- /* Currently, this either runs to completion, or hits a nonrecoverable error */
- rc = run_on_used_blocks(data.blocks_already_done, f2fs_info, &encrypt_one_block_f2fs, &data);
-
- if (rc) {
- printf("Error in running over f2fs blocks");
- rc = ENABLE_INPLACE_ERR_OTHER;
- goto errout;
- }
-
- *size_already_done += size;
- rc = 0;
-
-errout:
- if (rc)
- printf("Failed to encrypt f2fs filesystem on %s", real_blkdev);
-
- log_progress_f2fs(0, true);
- free(f2fs_info);
- free(data.buffer);
- close(data.realfd);
- close(data.cryptofd);
-
- return rc;
-}
-
-static int cryptfs_enable_inplace_full(char *crypto_blkdev, char *real_blkdev,
- off64_t size, off64_t *size_already_done,
- off64_t tot_size,
- off64_t previously_encrypted_upto)
-{
- int realfd, cryptofd;
- char *buf[CRYPT_INPLACE_BUFSIZE];
- int rc = ENABLE_INPLACE_ERR_OTHER;
- 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 ENABLE_INPLACE_ERR_OTHER;
- }
-
- if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) {
- printf("Error opening crypto_blkdev %s for inplace encrypt. err=%d(%s)\n",
- crypto_blkdev, errno, strerror(errno));
- close(realfd);
- return ENABLE_INPLACE_ERR_DEV;
- }
-
- /* 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...");
-
- i = previously_encrypted_upto + 1 - *size_already_done;
-
- if (lseek64(realfd, i * CRYPT_SECTOR_SIZE, SEEK_SET) < 0) {
- printf("Cannot seek to previously encrypted point on %s", real_blkdev);
- goto errout;
- }
-
- if (lseek64(cryptofd, i * CRYPT_SECTOR_SIZE, SEEK_SET) < 0) {
- printf("Cannot seek to previously encrypted point on %s", crypto_blkdev);
- goto errout;
- }
-
- for (;i < size && i % CRYPT_SECTORS_PER_BUFSIZE != 0; ++i) {
- if (unix_read(realfd, buf, CRYPT_SECTOR_SIZE) <= 0) {
- printf("Error reading initial sectors from real_blkdev %s for "
- "inplace encrypt\n", crypto_blkdev);
- goto errout;
- }
- if (unix_write(cryptofd, buf, CRYPT_SECTOR_SIZE) <= 0) {
- printf("Error writing initial sectors to crypto_blkdev %s for "
- "inplace encrypt\n", crypto_blkdev);
- goto errout;
- } else {
- printf("Encrypted 1 block at %" PRId64, i);
- }
- }
-
- one_pct = tot_numblocks / 100;
- cur_pct = 0;
- /* process the majority of the filesystem in blocks */
- for (i/=CRYPT_SECTORS_PER_BUFSIZE; 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), "%" PRId64, 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", crypto_blkdev);
- goto errout;
- }
- if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) {
- printf("Error writing crypto_blkdev %s for inplace encrypt", crypto_blkdev);
- goto errout;
- } else {
- printf("Encrypted %d block at %" PRId64,
- CRYPT_SECTORS_PER_BUFSIZE,
- i * CRYPT_SECTORS_PER_BUFSIZE);
- }
-
- if (1) {
- printf("Stopping encryption due to low battery");
- *size_already_done += (i + 1) * CRYPT_SECTORS_PER_BUFSIZE - 1;
- rc = 0;
- goto errout;
- }
- }
-
- /* Do any remaining sectors */
- for (i=0; i<remainder; i++) {
- if (unix_read(realfd, buf, CRYPT_SECTOR_SIZE) <= 0) {
- printf("Error reading final sectors from real_blkdev %s for inplace encrypt", crypto_blkdev);
- goto errout;
- }
- if (unix_write(cryptofd, buf, CRYPT_SECTOR_SIZE) <= 0) {
- printf("Error writing final sectors to crypto_blkdev %s for inplace encrypt", crypto_blkdev);
- goto errout;
- } else {
- printf("Encrypted 1 block at next location");
- }
- }
-
- *size_already_done += size;
- rc = 0;
-
-errout:
- close(realfd);
- close(cryptofd);
-
- return rc;
-}
-
-/* returns on of the ENABLE_INPLACE_* return codes */
-static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev,
- off64_t size, off64_t *size_already_done,
- off64_t tot_size,
- off64_t previously_encrypted_upto)
-{
- int rc_ext4, rc_f2fs, rc_full;
- if (previously_encrypted_upto) {
- printf("Continuing encryption from %" PRId64, previously_encrypted_upto);
- }
-
- if (*size_already_done + size < previously_encrypted_upto) {
- *size_already_done += size;
- return 0;
- }
-
- /* TODO: identify filesystem type.
- * As is, cryptfs_enable_inplace_ext4 will fail on an f2fs partition, and
- * then we will drop down to cryptfs_enable_inplace_f2fs.
- * */
- if ((rc_ext4 = cryptfs_enable_inplace_ext4(crypto_blkdev, real_blkdev,
- size, size_already_done,
- tot_size, previously_encrypted_upto)) == 0) {
- return 0;
- }
- printf("cryptfs_enable_inplace_ext4()=%d\n", rc_ext4);
-
- if ((rc_f2fs = cryptfs_enable_inplace_f2fs(crypto_blkdev, real_blkdev,
- size, size_already_done,
- tot_size, previously_encrypted_upto)) == 0) {
- return 0;
- }
- printf("cryptfs_enable_inplace_f2fs()=%d\n", rc_f2fs);
-
- rc_full = cryptfs_enable_inplace_full(crypto_blkdev, real_blkdev,
- size, size_already_done, tot_size,
- previously_encrypted_upto);
- printf("cryptfs_enable_inplace_full()=%d\n", rc_full);
-
- /* Hack for b/17898962, the following is the symptom... */
- if (rc_ext4 == ENABLE_INPLACE_ERR_DEV
- && rc_f2fs == ENABLE_INPLACE_ERR_DEV
- && rc_full == ENABLE_INPLACE_ERR_DEV) {
- return ENABLE_INPLACE_ERR_DEV;
- }
- return rc_full;
-}
-
-#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);
-}
-
-static int cryptfs_SHA256_fileblock(const char* filename, __le8* buf)
-{
- int fd = open(filename, O_RDONLY);
- if (fd == -1) {
- printf("Error opening file %s", filename);
- return -1;
- }
-
- char block[CRYPT_INPLACE_BUFSIZE];
- memset(block, 0, sizeof(block));
- if (unix_read(fd, block, sizeof(block)) < 0) {
- printf("Error reading file %s", filename);
- close(fd);
- return -1;
- }
-
- close(fd);
-
- SHA256_CTX c;
- SHA256_Init(&c);
- SHA256_Update(&c, block, sizeof(block));
- SHA256_Final(buf, &c);
-
- return 0;
-}
-
-static int get_fs_type(struct fstab_rec *rec)
-{
- if (!strcmp(rec->fs_type, "ext4")) {
- return EXT4_FS;
- } else if (!strcmp(rec->fs_type, "f2fs")) {
- return F2FS_FS;
- } else {
- return -1;
- }
-}
-
-static int cryptfs_enable_all_volumes(struct crypt_mnt_ftr *crypt_ftr, int how,
- char *crypto_blkdev, char *real_blkdev,
- int previously_encrypted_upto)
-{
- off64_t cur_encryption_done=0, tot_encryption_size=0;
- int i, rc = -1;
-
- if (1) {
- printf("Not starting encryption due to low battery");
- return 0;
- }
-
- /* The size of the userdata partition, and add in the vold volumes below */
- tot_encryption_size = crypt_ftr->fs_size;
-
- if (how == CRYPTO_ENABLE_WIPE) {
- struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, DATA_MNT_POINT);
- int fs_type = get_fs_type(rec);
- if (fs_type < 0) {
- printf("cryptfs_enable: unsupported fs type %s\n", rec->fs_type);
- return -1;
- }
- rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr->fs_size, fs_type);
- } else if (how == CRYPTO_ENABLE_INPLACE) {
- rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev,
- crypt_ftr->fs_size, &cur_encryption_done,
- tot_encryption_size,
- previously_encrypted_upto);
-
- if (rc == ENABLE_INPLACE_ERR_DEV) {
- /* Hack for b/17898962 */
- printf("cryptfs_enable: crypto block dev failure. Must reboot...\n");
- cryptfs_reboot(reboot);
- }
-
- if (!rc) {
- crypt_ftr->encrypted_upto = cur_encryption_done;
- }
-
- if (!rc && crypt_ftr->encrypted_upto == crypt_ftr->fs_size) {
- /* The inplace routine never actually sets the progress to 100% due
- * to the round down nature of integer division, so set it here */
- property_set("vold.encrypt_progress", "100");
- }
- } else {
- /* Shouldn't happen */
- printf("cryptfs_enable: internal error, unknown option\n");
- rc = -1;
- }
-
- return rc;
-}
-
-int cryptfs_enable_internal(char *howarg, int crypt_type, char *passwd,
- int allow_reboot)
-{
- int how = 0;
- char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN];
- unsigned long nr_sec;
- unsigned char decrypted_master_key[KEY_LEN_BYTES];
- int rc=-1, fd, i, ret;
- struct crypt_mnt_ftr crypt_ftr;
- struct crypt_persist_data *pdata;
- char encrypted_state[PROPERTY_VALUE_MAX];
- char lockid[32] = { 0 };
- char key_loc[PROPERTY_VALUE_MAX];
- char fuse_sdcard[PROPERTY_VALUE_MAX];
- char *sd_mnt_point;
- int num_vols;
- struct volume_info *vol_list = 0;
- off64_t previously_encrypted_upto = 0;
-printf("cryptfs_enable_internal disabled by TWRP\n");
-return -1;
- if (!strcmp(howarg, "wipe")) {
- how = CRYPTO_ENABLE_WIPE;
- } else if (! strcmp(howarg, "inplace")) {
- how = CRYPTO_ENABLE_INPLACE;
- } else {
- /* Shouldn't happen, as CommandListener vets the args */
- goto error_unencrypted;
- }
-
- /* See if an encryption was underway and interrupted */
- if (how == CRYPTO_ENABLE_INPLACE
- && get_crypt_ftr_and_key(&crypt_ftr) == 0
- && (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS)) {
- previously_encrypted_upto = crypt_ftr.encrypted_upto;
- crypt_ftr.encrypted_upto = 0;
- crypt_ftr.flags &= ~CRYPT_ENCRYPTION_IN_PROGRESS;
-
- /* At this point, we are in an inconsistent state. Until we successfully
- complete encryption, a reboot will leave us broken. So mark the
- encryption failed in case that happens.
- On successfully completing encryption, remove this flag */
- crypt_ftr.flags |= CRYPT_INCONSISTENT_STATE;
-
- put_crypt_ftr_and_key(&crypt_ftr);
- }
-
- property_get("ro.crypto.state", encrypted_state, "");
- if (!strcmp(encrypted_state, "encrypted") && !previously_encrypted_upto) {
- printf("Device is already running encrypted, aborting");
- goto error_unencrypted;
- }
-
- // TODO refactor fs_mgr_get_crypt_info to get both in one call
- fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
- fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
-
- /* Get the size of the real block device */
- fd = open(real_blkdev, O_RDONLY);
- if ( (nr_sec = get_blkdev_size(fd)) == 0) {
- printf("Cannot get size of block device %s\n", real_blkdev);
- goto error_unencrypted;
- }
- close(fd);
-
- /* If doing inplace encryption, make sure the orig fs doesn't include the crypto footer */
- if ((how == CRYPTO_ENABLE_INPLACE) && (!strcmp(key_loc, KEY_IN_FOOTER))) {
- unsigned int fs_size_sec, max_fs_size_sec;
- fs_size_sec = get_fs_size(real_blkdev);
- if (fs_size_sec == 0)
- fs_size_sec = get_f2fs_filesystem_size_sec(real_blkdev);
-
- max_fs_size_sec = nr_sec - (CRYPT_FOOTER_OFFSET / CRYPT_SECTOR_SIZE);
-
- if (fs_size_sec > max_fs_size_sec) {
- printf("Orig filesystem overlaps crypto footer region. Cannot encrypt in place.");
- goto error_unencrypted;
- }
- }
-
- /* Get a wakelock as this may take a while, and we don't want the
- * device to sleep on us. We'll grab a partial wakelock, and if the UI
- * wants to keep the screen on, it can grab a full wakelock.
- */
- snprintf(lockid, sizeof(lockid), "enablecrypto%d", (int) getpid());
- acquire_wake_lock(PARTIAL_WAKE_LOCK, lockid);
-
- /* Get the sdcard mount point */
- sd_mnt_point = getenv("EMULATED_STORAGE_SOURCE");
- if (!sd_mnt_point) {
- sd_mnt_point = getenv("EXTERNAL_STORAGE");
- }
- if (!sd_mnt_point) {
- sd_mnt_point = "/mnt/sdcard";
- }
-
- /* TODO
- * Currently do not have test devices with multiple encryptable volumes.
- * When we acquire some, re-add support.
- */
- num_vols=0/*vold_getNumDirectVolumes()*/;
- vol_list = malloc(sizeof(struct volume_info) * num_vols);
- //vold_getDirectVolumeList(vol_list);
-
- for (i=0; i<num_vols; i++) {
- if (should_encrypt(&vol_list[i])) {
- printf("Cannot encrypt if there are multiple encryptable volumes"
- "%s\n", vol_list[i].label);
- goto error_unencrypted;
- }
- }
-
- /* The init files are setup to stop the class main and late start when
- * vold sets trigger_shutdown_framework.
- */
- property_set("vold.decrypt", "trigger_shutdown_framework");
- printf("Just asked init to shut down class main\n");
-
- if (1 /*vold_unmountAllAsecs()*/) {
- /* Just report the error. If any are left mounted,
- * umounting /data below will fail and handle the error.
- */
- printf("Error unmounting internal asecs");
- }
-
- property_get("ro.crypto.fuse_sdcard", fuse_sdcard, "");
- if (!strcmp(fuse_sdcard, "true")) {
- /* This is a device using the fuse layer to emulate the sdcard semantics
- * on top of the userdata partition. vold does not manage it, it is managed
- * by the sdcard service. The sdcard service was killed by the property trigger
- * above, so just unmount it now. We must do this _AFTER_ killing the framework,
- * unlike the case for vold managed devices above.
- */
- if (wait_and_unmount(sd_mnt_point, false)) {
- goto error_shutting_down;
- }
- }
-
- /* Now unmount the /data partition. */
- if (wait_and_unmount(DATA_MNT_POINT, false)) {
- if (allow_reboot) {
- goto error_shutting_down;
- } else {
- goto error_unencrypted;
- }
- }
-
- /* Do extra work for a better UX when doing the long inplace encryption */
- if (how == CRYPTO_ENABLE_INPLACE) {
- /* Now that /data is unmounted, we need to mount a tmpfs
- * /data, set a property saying we're doing inplace encryption,
- * and restart the framework.
- */
- if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) {
- goto error_shutting_down;
- }
- /* Tells the framework that inplace encryption is starting */
- property_set("vold.encrypt_progress", "0");
-
- /* restart the framework. */
- /* Create necessary paths on /data */
- if (prep_data_fs()) {
- goto error_shutting_down;
- }
-
- /* 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);
-
- /* startup service classes main and late_start */
- property_set("vold.decrypt", "trigger_restart_min_framework");
- printf("Just triggered restart_min_framework\n");
-
- /* OK, the framework is restarted and will soon be showing a
- * progress bar. Time to setup an encrypted mapping, and
- * either write a new filesystem, or encrypt in place updating
- * the progress bar as we work.
- */
- }
-
- /* Start the actual work of making an encrypted filesystem */
- /* Initialize a crypt_mnt_ftr for the partition */
- if (previously_encrypted_upto == 0) {
- if (cryptfs_init_crypt_mnt_ftr(&crypt_ftr)) {
- goto error_shutting_down;
- }
-
- if (!strcmp(key_loc, KEY_IN_FOOTER)) {
- crypt_ftr.fs_size = nr_sec
- - (CRYPT_FOOTER_OFFSET / CRYPT_SECTOR_SIZE);
- } else {
- crypt_ftr.fs_size = nr_sec;
- }
- /* At this point, we are in an inconsistent state. Until we successfully
- complete encryption, a reboot will leave us broken. So mark the
- encryption failed in case that happens.
- On successfully completing encryption, remove this flag */
- crypt_ftr.flags |= CRYPT_INCONSISTENT_STATE;
- crypt_ftr.crypt_type = crypt_type;
- strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256");
-
- /* Make an encrypted master key */
- if (create_encrypted_random_key(passwd, crypt_ftr.master_key, crypt_ftr.salt, &crypt_ftr)) {
- printf("Cannot create encrypted master key\n");
- goto error_shutting_down;
- }
-
- /* Write the key to the end of the partition */
- put_crypt_ftr_and_key(&crypt_ftr);
-
- /* If any persistent data has been remembered, save it.
- * If none, create a valid empty table and save that.
- */
- if (!persist_data) {
- pdata = malloc(CRYPT_PERSIST_DATA_SIZE);
- if (pdata) {
- init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE);
- persist_data = pdata;
- }
- }
- if (persist_data) {
- save_persistent_data();
- }
- }
-
- decrypt_master_key(passwd, decrypted_master_key, &crypt_ftr, 0, 0);
- create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev,
- "userdata");
-
- /* If we are continuing, check checksums match */
- rc = 0;
- if (previously_encrypted_upto) {
- __le8 hash_first_block[SHA256_DIGEST_LENGTH];
- rc = cryptfs_SHA256_fileblock(crypto_blkdev, hash_first_block);
-
- if (!rc && memcmp(hash_first_block, crypt_ftr.hash_first_block,
- sizeof(hash_first_block)) != 0) {
- printf("Checksums do not match - trigger wipe");
- rc = -1;
- }
- }
-
- if (!rc) {
- rc = cryptfs_enable_all_volumes(&crypt_ftr, how,
- crypto_blkdev, real_blkdev,
- previously_encrypted_upto);
- }
-
- /* Calculate checksum if we are not finished */
- if (!rc && crypt_ftr.encrypted_upto != crypt_ftr.fs_size) {
- rc = cryptfs_SHA256_fileblock(crypto_blkdev,
- crypt_ftr.hash_first_block);
- if (rc) {
- printf("Error calculating checksum for continuing encryption");
- rc = -1;
- }
- }
-
- /* Undo the dm-crypt mapping whether we succeed or not */
- delete_crypto_blk_dev("userdata");
-
- free(vol_list);
-
- if (! rc) {
- /* Success */
- crypt_ftr.flags &= ~CRYPT_INCONSISTENT_STATE;
-
- if (crypt_ftr.encrypted_upto != crypt_ftr.fs_size) {
- printf("Encrypted up to sector %lld - will continue after reboot",
- crypt_ftr.encrypted_upto);
- crypt_ftr.flags |= CRYPT_ENCRYPTION_IN_PROGRESS;
- }
-
- put_crypt_ftr_and_key(&crypt_ftr);
-
- if (crypt_ftr.encrypted_upto == crypt_ftr.fs_size) {
- char value[PROPERTY_VALUE_MAX];
- property_get("ro.crypto.state", value, "");
- if (!strcmp(value, "")) {
- /* default encryption - continue first boot sequence */
- property_set("ro.crypto.state", "encrypted");
- release_wake_lock(lockid);
- cryptfs_check_passwd(DEFAULT_PASSWORD);
- cryptfs_restart_internal(1);
- return 0;
- } else {
- sleep(2); /* Give the UI a chance to show 100% progress */
- cryptfs_reboot(reboot);
- }
- } else {
- sleep(2); /* Partially encrypted, ensure writes flushed to ssd */
- cryptfs_reboot(shutdown);
- }
- } else {
- char value[PROPERTY_VALUE_MAX];
-
- property_get("ro.vold.wipe_on_crypt_fail", value, "0");
- if (!strcmp(value, "1")) {
- /* wipe data if encryption failed */
- printf("encryption failed - rebooting into recovery to wipe data\n");
- mkdir("/cache/recovery", 0700);
- int fd = open("/cache/recovery/command", O_RDWR|O_CREAT|O_TRUNC, 0600);
- if (fd >= 0) {
- write(fd, "--wipe_data\n", strlen("--wipe_data\n") + 1);
- write(fd, "--reason=cryptfs_enable_internal\n", strlen("--reason=cryptfs_enable_internal\n") + 1);
- close(fd);
- } else {
- printf("could not open /cache/recovery/command\n");
- }
- cryptfs_reboot(recovery);
- } else {
- /* set property to trigger dialog */
- property_set("vold.encrypt_progress", "error_partially_encrypted");
- release_wake_lock(lockid);
- }
- return -1;
- }
-
- /* hrm, the encrypt step claims success, but the reboot failed.
- * This should not happen.
- * Set the property and return. Hope the framework can deal with it.
- */
- property_set("vold.encrypt_progress", "error_reboot_failed");
- release_wake_lock(lockid);
- return rc;
-
-error_unencrypted:
- free(vol_list);
- property_set("vold.encrypt_progress", "error_not_encrypted");
- if (lockid[0]) {
- release_wake_lock(lockid);
- }
- return -1;
-
-error_shutting_down:
- /* we failed, and have not encrypted anthing, so the users's data is still intact,
- * but the framework is stopped and not restarted to show the error, so it's up to
- * vold to restart the system.
- */
- printf("Error enabling encryption after framework is shutdown, no data changed, restarting system");
- cryptfs_reboot(reboot);
-
- /* shouldn't get here */
- property_set("vold.encrypt_progress", "error_shutting_down");
- free(vol_list);
- if (lockid[0]) {
- release_wake_lock(lockid);
- }
- return -1;
-}
-
-int cryptfs_enable(char *howarg, int type, char *passwd, int allow_reboot)
-{
- char* adjusted_passwd = adjust_passwd(passwd);
- if (adjusted_passwd) {
- passwd = adjusted_passwd;
- }
-
- int rc = cryptfs_enable_internal(howarg, type, passwd, allow_reboot);
-
- free(adjusted_passwd);
- return rc;
-}
-
-int cryptfs_enable_default(char *howarg, int allow_reboot)
-{
- return cryptfs_enable_internal(howarg, CRYPT_TYPE_DEFAULT,
- DEFAULT_PASSWORD, allow_reboot);
-}
-
-int cryptfs_changepw(int crypt_type, const 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;
- }
-
- if (crypt_type < 0 || crypt_type > CRYPT_TYPE_MAX_TYPE) {
- printf("Invalid crypt_type %d", crypt_type);
- return -1;
- }
-
- /* get key */
- if (get_crypt_ftr_and_key(&crypt_ftr)) {
- printf("Error getting crypt footer and key");
- return -1;
- }
-
- crypt_ftr.crypt_type = crypt_type;
-
- char* adjusted_passwd = adjust_passwd(newpw);
- if (adjusted_passwd) {
- newpw = adjusted_passwd;
- }
-
- encrypt_master_key(crypt_type == CRYPT_TYPE_DEFAULT ? DEFAULT_PASSWORD
- : newpw,
- crypt_ftr.salt,
- saved_master_key,
- crypt_ftr.master_key,
- &crypt_ftr);
-
- /* save the key */
- put_crypt_ftr_and_key(&crypt_ftr);
-
- free(adjusted_passwd);
- 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;
-}
-
-/* Checks userdata. Attempt to mount the volume if default-
- * encrypted.
- * On success trigger next init phase and return 0.
- * Currently do not handle failure - see TODO below.
- */
-int cryptfs_mount_default_encrypted(void)
-{
- char decrypt_state[PROPERTY_VALUE_MAX];
- property_get("vold.decrypt", decrypt_state, "0");
- if (!strcmp(decrypt_state, "0")) {
- printf("Not encrypted - should not call here");
- } else {
- int crypt_type = cryptfs_get_password_type();
- if (crypt_type < 0 || crypt_type > CRYPT_TYPE_MAX_TYPE) {
- printf("Bad crypt type - error");
- } else if (crypt_type != CRYPT_TYPE_DEFAULT) {
- printf("Password is not default - "
- "starting min framework to prompt");
- property_set("vold.decrypt", "trigger_restart_min_framework");
- return 0;
- } else if (cryptfs_check_passwd(DEFAULT_PASSWORD) == 0) {
- printf("Password is default - restarting filesystem");
- cryptfs_restart_internal(0);
- return 0;
- } else {
- printf("Encrypted, default crypt type but can't decrypt");
- }
- }
-
- /** Corrupt. Allow us to boot into framework, which will detect bad
- crypto when it calls do_crypto_complete, then do a factory reset
- */
- property_set("vold.decrypt", "trigger_restart_min_framework");
- return 0;
-}
-
/* Returns type of the password, default, pattern, pin or password.
*/
int cryptfs_get_password_type(void)
{
struct crypt_mnt_ftr crypt_ftr;
- 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;
- }
if (get_crypt_ftr_and_key(&crypt_ftr)) {
printf("Error getting crypt footer and key\n");
@@ -3595,26 +1445,3 @@ int cryptfs_get_password_type(void)
return crypt_ftr.crypt_type;
}
-
-char* cryptfs_get_password()
-{
- struct timespec now;
- clock_gettime(CLOCK_MONOTONIC, &now);
- if (now.tv_sec < password_expiry_time) {
- return password;
- } else {
- cryptfs_clear_password();
- return 0;
- }
-}
-
-void cryptfs_clear_password()
-{
- if (password) {
- size_t len = strlen(password);
- memset(password, 0, len);
- free(password);
- password = 0;
- password_expiry_time = 0;
- }
-}