am 0002a85f: am 5d27f0a7: Merge "Fix spelling."
* commit '0002a85f8b94d96b9b86819bd33fdfd7cfe74080':
Fix spelling.
diff --git a/Android.mk b/Android.mk
index 098c3d0..ba9b0a1 100644
--- a/Android.mk
+++ b/Android.mk
@@ -15,13 +15,15 @@
Devmapper.cpp \
ResponseCode.cpp \
Xwarp.cpp \
+ VoldUtil.c \
fstrim.c \
cryptfs.c
common_c_includes := \
$(KERNEL_HEADERS) \
system/extras/ext4_utils \
- external/openssl/include
+ external/openssl/include \
+ external/scrypt/lib/crypto
common_shared_libraries := \
libsysutils \
@@ -32,6 +34,10 @@
liblogwrap \
libcrypto
+common_static_libraries := \
+ libfs_mgr \
+ libscrypt_static
+
include $(CLEAR_VARS)
LOCAL_MODULE := libvold
@@ -42,7 +48,7 @@
LOCAL_SHARED_LIBRARIES := $(common_shared_libraries)
-LOCAL_STATIC_LIBRARIES := libfs_mgr
+LOCAL_STATIC_LIBRARIES := $(common_static_libraries)
LOCAL_MODULE_TAGS := eng tests
@@ -62,7 +68,7 @@
LOCAL_SHARED_LIBRARIES := $(common_shared_libraries)
-LOCAL_STATIC_LIBRARIES := libfs_mgr
+LOCAL_STATIC_LIBRARIES := $(common_static_libraries)
include $(BUILD_EXECUTABLE)
diff --git a/CommandListener.cpp b/CommandListener.cpp
index f8baff5..5de920f 100644
--- a/CommandListener.cpp
+++ b/CommandListener.cpp
@@ -162,11 +162,16 @@
}
rc = vm->unmountVolume(argv[2], force, revert);
} else if (!strcmp(argv[1], "format")) {
- if (argc != 3) {
- cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: volume format <path>", false);
+ if (argc < 3 || argc > 4 ||
+ (argc == 4 && strcmp(argv[3], "wipe"))) {
+ cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: volume format <path> [wipe]", false);
return 0;
}
- rc = vm->formatVolume(argv[2]);
+ bool wipe = false;
+ if (argc >= 4 && !strcmp(argv[3], "wipe")) {
+ wipe = true;
+ }
+ rc = vm->formatVolume(argv[2], wipe);
} else if (!strcmp(argv[1], "share")) {
if (argc != 4) {
cli->sendMsg(ResponseCode::CommandSyntaxError,
@@ -598,6 +603,25 @@
}
SLOGD("cryptfs verifypw {}");
rc = cryptfs_verify_passwd(argv[2]);
+ } else if (!strcmp(argv[1], "getfield")) {
+ char valbuf[PROPERTY_VALUE_MAX];
+
+ if (argc != 3) {
+ cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs getfield <fieldname>", false);
+ return 0;
+ }
+ dumpArgs(argc, argv, -1);
+ rc = cryptfs_getfield(argv[2], valbuf, sizeof(valbuf));
+ if (rc == 0) {
+ cli->sendMsg(ResponseCode::CryptfsGetfieldResult, valbuf, false);
+ }
+ } else if (!strcmp(argv[1], "setfield")) {
+ if (argc != 4) {
+ cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs setfield <fieldname> <value>", false);
+ return 0;
+ }
+ dumpArgs(argc, argv, -1);
+ rc = cryptfs_setfield(argv[2], argv[3]);
} else {
dumpArgs(argc, argv, -1);
cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown cryptfs cmd", false);
diff --git a/Fat.cpp b/Fat.cpp
index 807f440..c967a90 100644
--- a/Fat.cpp
+++ b/Fat.cpp
@@ -30,6 +30,8 @@
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/wait.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
#include <linux/kdev_t.h>
@@ -167,12 +169,16 @@
return rc;
}
-int Fat::format(const char *fsPath, unsigned int numSectors) {
+int Fat::format(const char *fsPath, unsigned int numSectors, bool wipe) {
int fd;
const char *args[10];
int rc;
int status;
+ if (wipe) {
+ Fat::wipe(fsPath, numSectors);
+ }
+
args[0] = MKDOSFS_PATH;
args[1] = "-F";
args[2] = "32";
@@ -220,3 +226,30 @@
}
return 0;
}
+
+void Fat::wipe(const char *fsPath, unsigned int numSectors) {
+ int fd;
+ unsigned long long range[2];
+
+ fd = open(fsPath, O_RDWR);
+ if (fd >= 0) {
+ if (numSectors == 0) {
+ numSectors = get_blkdev_size(fd);
+ }
+ if (numSectors == 0) {
+ SLOGE("Fat wipe failed to determine size of %s", fsPath);
+ close(fd);
+ return;
+ }
+ range[0] = 0;
+ range[1] = (unsigned long long)numSectors * 512;
+ if (ioctl(fd, BLKDISCARD, &range) < 0) {
+ SLOGE("Fat wipe failed to discard blocks on %s", fsPath);
+ } else {
+ SLOGI("Fat wipe %d sectors on %s succeeded", numSectors, fsPath);
+ }
+ close(fd);
+ } else {
+ SLOGE("Fat wipe failed to open device %s", fsPath);
+ }
+}
diff --git a/Fat.h b/Fat.h
index e02d88c..19614d1 100644
--- a/Fat.h
+++ b/Fat.h
@@ -26,7 +26,10 @@
bool ro, bool remount, bool executable,
int ownerUid, int ownerGid, int permMask,
bool createLost);
- static int format(const char *fsPath, unsigned int numSectors);
+ static int format(const char *fsPath, unsigned int numSectors, bool wipe);
+
+private:
+ static void wipe(const char *fsPath, unsigned int numSectors);
};
#endif
diff --git a/ResponseCode.h b/ResponseCode.h
index 402e35b..dccacb8 100644
--- a/ResponseCode.h
+++ b/ResponseCode.h
@@ -26,6 +26,7 @@
static const int VolumeListResult = 110;
static const int AsecListResult = 111;
static const int StorageUsersListResult = 112;
+ static const int CryptfsGetfieldResult = 113;
// 200 series - Requested action has been successfully completed
static const int CommandOkay = 200;
diff --git a/VoldUtil.c b/VoldUtil.c
new file mode 100644
index 0000000..b5f9946
--- /dev/null
+++ b/VoldUtil.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#include <sys/ioctl.h>
+#include <linux/fs.h>
+
+unsigned int get_blkdev_size(int fd)
+{
+ unsigned int nr_sec;
+
+ if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
+ nr_sec = 0;
+ }
+
+ return nr_sec;
+}
diff --git a/VoldUtil.h b/VoldUtil.h
index 30a3add..469489a 100644
--- a/VoldUtil.h
+++ b/VoldUtil.h
@@ -17,6 +17,12 @@
#ifndef _VOLDUTIL_H
#define _VOLDUTIL_H
+#include <sys/cdefs.h>
+
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
+__BEGIN_DECLS
+ unsigned int get_blkdev_size(int fd);
+__END_DECLS
+
#endif
diff --git a/Volume.cpp b/Volume.cpp
index 4a00ccc..4501e90 100644
--- a/Volume.cpp
+++ b/Volume.cpp
@@ -206,7 +206,7 @@
return 0;
}
-int Volume::formatVol() {
+int Volume::formatVol(bool wipe) {
if (getState() == Volume::State_NoMedia) {
errno = ENODEV;
@@ -250,7 +250,7 @@
SLOGI("Formatting volume %s (%s)", getLabel(), devicePath);
}
- if (Fat::format(devicePath, 0)) {
+ if (Fat::format(devicePath, 0, wipe)) {
SLOGE("Failed to format (%s)", strerror(errno));
goto err;
}
diff --git a/Volume.h b/Volume.h
index c717d4d..22e247d 100644
--- a/Volume.h
+++ b/Volume.h
@@ -67,7 +67,7 @@
int mountVol();
int unmountVol(bool force, bool revert);
- int formatVol();
+ int formatVol(bool wipe);
const char *getLabel() { return mLabel; }
const char *getMountpoint() { return mMountpoint; }
diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index a1930d1..180387c 100644
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -167,7 +167,7 @@
return 0;
}
-int VolumeManager::formatVolume(const char *label) {
+int VolumeManager::formatVolume(const char *label, bool wipe) {
Volume *v = lookupVolume(label);
if (!v) {
@@ -180,7 +180,7 @@
return -1;
}
- return v->formatVol();
+ return v->formatVol(wipe);
}
int VolumeManager::getObbMountPath(const char *sourceFile, char *mountPath, int mountPathLen) {
@@ -414,7 +414,7 @@
if (usingExt4) {
formatStatus = Ext4::format(dmDevice, mountPoint);
} else {
- formatStatus = Fat::format(dmDevice, numImgSectors);
+ formatStatus = Fat::format(dmDevice, numImgSectors, 0);
}
if (formatStatus < 0) {
diff --git a/VolumeManager.h b/VolumeManager.h
index 198b5a9..be78516 100644
--- a/VolumeManager.h
+++ b/VolumeManager.h
@@ -83,7 +83,7 @@
int shareVolume(const char *label, const char *method);
int unshareVolume(const char *label, const char *method);
int shareEnabled(const char *path, const char *method, bool *enabled);
- int formatVolume(const char *label);
+ int formatVolume(const char *label, bool wipe);
void disableVolumeManager(void) { mVolManagerDisabled = 1; }
/* ASEC */
diff --git a/cryptfs.c b/cryptfs.c
index 3af7a5e..266481d 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -35,17 +35,18 @@
#include <openssl/evp.h>
#include <openssl/sha.h>
#include <errno.h>
-#include <cutils/android_reboot.h>
#include <ext4.h>
#include <linux/kdev_t.h>
#include <fs_mgr.h>
#include "cryptfs.h"
#define LOG_TAG "Cryptfs"
-#include "cutils/android_reboot.h"
#include "cutils/log.h"
#include "cutils/properties.h"
+#include "cutils/android_reboot.h"
#include "hardware_legacy/power.h"
#include "VolumeManager.h"
+#include "VoldUtil.h"
+#include "crypto_scrypt.h"
#define DM_CRYPT_BUF_SIZE 4096
#define DATA_MNT_POINT "/data"
@@ -64,12 +65,25 @@
char *me = "cryptfs";
static unsigned char saved_master_key[KEY_LEN_BYTES];
-static char *saved_data_blkdev;
static char *saved_mount_point;
static int master_key_saved = 0;
+static struct crypt_persist_data *persist_data = NULL;
extern 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);
@@ -84,6 +98,55 @@
}
}
+/**
+ * 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 (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)) {
+ SLOGW("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;
@@ -115,64 +178,91 @@
return (unsigned int) (len / 512);
}
-static unsigned int get_blkdev_size(int fd)
+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 ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) {
- nr_sec = 0;
+ 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) {
+ SLOGE("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 {
+ SLOGE("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;
+ }
}
- return nr_sec;
+ 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(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr,
- unsigned char *key, unsigned char *salt)
+static int put_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr)
{
int fd;
unsigned int nr_sec, cnt;
- off64_t off;
+ /* starting_off is set to the SEEK_SET offset
+ * where the crypto structure starts
+ */
+ off64_t starting_off;
int rc = -1;
- char *fname;
+ char *fname = NULL;
char key_loc[PROPERTY_VALUE_MAX];
struct stat statbuf;
- fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
-
- if (!strcmp(key_loc, KEY_IN_FOOTER)) {
- fname = real_blk_name;
- if ( (fd = open(fname, O_RDWR)) < 0) {
- SLOGE("Cannot open real block device %s\n", fname);
- return -1;
- }
-
- if ( (nr_sec = get_blkdev_size(fd)) == 0) {
- SLOGE("Cannot get size of block device %s\n", fname);
- goto errout;
- }
-
- /* 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.
- */
- off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
-
- if (lseek64(fd, off, SEEK_SET) == -1) {
- SLOGE("Cannot seek to real block device footer\n");
- goto errout;
- }
- } else if (key_loc[0] == '/') {
- fname = key_loc;
- if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) {
- SLOGE("Cannot open footer file %s\n", fname);
- return -1;
- }
- } else {
+ if (get_crypt_ftr_info(&fname, &starting_off)) {
+ SLOGE("Unable to get crypt_ftr_info\n");
+ return -1;
+ }
+ if (fname[0] != '/') {
SLOGE("Unexpected value for crypto key location\n");
- return -1;;
+ return -1;
+ }
+ if ( (fd = open(fname, O_RDWR)) < 0) {
+ SLOGE("Cannot open footer file %s\n", fname);
+ return -1;
+ }
+
+ /* Seek to the start of the crypt footer */
+ if (lseek64(fd, starting_off, SEEK_SET) == -1) {
+ SLOGE("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)) {
@@ -180,36 +270,6 @@
goto errout;
}
- if (key) {
- if (crypt_ftr->keysize != KEY_LEN_BYTES) {
- SLOGE("Keysize of %d bits not supported for real block device %s\n",
- crypt_ftr->keysize*8, fname);
- goto errout;
- }
-
- if ( (cnt = write(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) {
- SLOGE("Cannot write key for real block device %s\n", fname);
- goto errout;
- }
- }
-
- if (salt) {
- /* Compute the offset from the last write to the salt */
- off = KEY_TO_SALT_PADDING;
- if (! key)
- off += crypt_ftr->keysize;
-
- if (lseek64(fd, off, SEEK_CUR) == -1) {
- SLOGE("Cannot seek to real block device salt \n");
- goto errout;
- }
-
- if ( (cnt = write(fd, salt, SALT_LEN)) != SALT_LEN) {
- SLOGE("Cannot write salt for real block device %s\n", fname);
- 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) && (key_loc[0] == '/')) {
@@ -228,57 +288,116 @@
}
-static int get_crypt_ftr_and_key(char *real_blk_name, struct crypt_mnt_ftr *crypt_ftr,
- unsigned char *key, unsigned char *salt)
+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;
+
+ 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;
+
+ SLOGW("upgrading crypto footer to 1.1");
+
+ pdata = malloc(CRYPT_PERSIST_DATA_SIZE);
+ if (pdata == NULL) {
+ SLOGE("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) {
+ SLOGE("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)) {
+ SLOGW("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) {
+ SLOGE("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 off;
+ off64_t starting_off;
int rc = -1;
char key_loc[PROPERTY_VALUE_MAX];
- char *fname;
+ char *fname = NULL;
struct stat statbuf;
- fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
-
- if (!strcmp(key_loc, KEY_IN_FOOTER)) {
- fname = real_blk_name;
- if ( (fd = open(fname, O_RDONLY)) < 0) {
- SLOGE("Cannot open real block device %s\n", fname);
- return -1;
- }
-
- if ( (nr_sec = get_blkdev_size(fd)) == 0) {
- SLOGE("Cannot get size of block device %s\n", fname);
- goto errout;
- }
-
- /* 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.
- */
- off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET;
-
- if (lseek64(fd, off, SEEK_SET) == -1) {
- SLOGE("Cannot seek to real block device footer\n");
- goto errout;
- }
- } else if (key_loc[0] == '/') {
- fname = key_loc;
- if ( (fd = open(fname, O_RDONLY)) < 0) {
- SLOGE("Cannot open footer file %s\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)) {
- SLOGE("footer file %s is not the expected size!\n", fname);
- goto errout;
- }
- } else {
+ if (get_crypt_ftr_info(&fname, &starting_off)) {
+ SLOGE("Unable to get crypt_ftr_info\n");
+ return -1;
+ }
+ if (fname[0] != '/') {
SLOGE("Unexpected value for crypto key location\n");
- return -1;;
+ return -1;
+ }
+ if ( (fd = open(fname, O_RDWR)) < 0) {
+ SLOGE("Cannot open footer file %s\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)) {
+ SLOGE("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) {
+ SLOGE("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)) {
@@ -291,46 +410,22 @@
goto errout;
}
- if (crypt_ftr->major_version != 1) {
- SLOGE("Cannot understand major version %d real block device footer\n",
- crypt_ftr->major_version);
+ if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) {
+ SLOGE("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 != 0) {
- SLOGW("Warning: crypto footer minor version %d, expected 0, continuing...\n",
- crypt_ftr->minor_version);
+ if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) {
+ SLOGW("Warning: crypto footer minor version %d, expected <= %d, continuing...\n",
+ crypt_ftr->minor_version, CURRENT_MINOR_VERSION);
}
- if (crypt_ftr->ftr_size > sizeof(struct crypt_mnt_ftr)) {
- /* the footer size is bigger than we expected.
- * Skip to it's stated end so we can read the key.
- */
- if (lseek(fd, crypt_ftr->ftr_size - sizeof(struct crypt_mnt_ftr), SEEK_CUR) == -1) {
- SLOGE("Cannot seek to start of key\n");
- goto errout;
- }
- }
-
- if (crypt_ftr->keysize != KEY_LEN_BYTES) {
- SLOGE("Keysize of %d bits not supported for real block device %s\n",
- crypt_ftr->keysize * 8, fname);
- goto errout;
- }
-
- if ( (cnt = read(fd, key, crypt_ftr->keysize)) != crypt_ftr->keysize) {
- SLOGE("Cannot read key for real block device %s\n", fname);
- goto errout;
- }
-
- if (lseek64(fd, KEY_TO_SALT_PADDING, SEEK_CUR) == -1) {
- SLOGE("Cannot seek to real block device salt\n");
- goto errout;
- }
-
- if ( (cnt = read(fd, salt, SALT_LEN)) != SALT_LEN) {
- SLOGE("Cannot read salt for real block device %s\n", fname);
- goto errout;
+ /* 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! */
@@ -341,6 +436,227 @@
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]) {
+ SLOGE("Crypt_ftr persist data regions overlap");
+ return -1;
+ }
+
+ if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) {
+ SLOGE("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) {
+ SLOGE("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)) {
+ SLOGE("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) {
+ SLOGE("Cannot open %s metadata file", fname);
+ return -1;
+ }
+
+ if (persist_data == NULL) {
+ pdata = malloc(crypt_ftr.persist_data_size);
+ if (pdata == NULL) {
+ SLOGE("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) {
+ SLOGE("Cannot seek to read persistent data on %s", fname);
+ goto err2;
+ }
+ if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){
+ SLOGE("Error reading persistent data on iteration %d", i);
+ goto err2;
+ }
+ if (pdata->persist_magic == PERSIST_DATA_MAGIC) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ SLOGI("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) {
+ SLOGE("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)) {
+ SLOGE("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) {
+ SLOGE("Cannot open %s metadata file", fname);
+ return -1;
+ }
+
+ pdata = malloc(crypt_ftr.persist_data_size);
+ if (pdata == NULL) {
+ SLOGE("Cannot allocate persistant data");
+ goto err;
+ }
+
+ if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) {
+ SLOGE("Cannot seek to read persistent data on %s", fname);
+ goto err2;
+ }
+
+ if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) {
+ SLOGE("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) {
+ SLOGE("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) {
+ SLOGE("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) {
+ SLOGE("Cannot write to erase previous persistent data");
+ goto err2;
+ }
+ fsync(fd);
+ } else {
+ SLOGE("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
*/
@@ -548,24 +864,37 @@
}
-static void pbkdf2(char *passwd, unsigned char *salt, unsigned char *ikey)
-{
+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)
+ 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 */
- pbkdf2(passwd, salt, ikey);
-
+ 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)) {
SLOGE("EVP_EncryptInit failed\n");
@@ -594,14 +923,15 @@
static int decrypt_master_key(char *passwd, unsigned char *salt,
unsigned char *encrypted_master_key,
- unsigned char *decrypted_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 */
- pbkdf2(passwd, salt, ikey);
+ kdf(passwd, salt, ikey, kdf_params);
/* Initialize the decryption engine */
if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) {
@@ -624,8 +954,47 @@
}
}
-static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt)
+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) {
+ SLOGW("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;
@@ -638,7 +1007,7 @@
close(fd);
/* Now encrypt it with the password */
- return encrypt_master_key(passwd, salt, key_buf, master_key);
+ return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr);
}
static int wait_and_unmount(char *mountpoint)
@@ -791,9 +1160,6 @@
static int do_crypto_complete(char *mount_point)
{
struct crypt_mnt_ftr crypt_ftr;
- unsigned char encrypted_master_key[32];
- unsigned char salt[SALT_LEN];
- char real_blkdev[MAXPATHLEN];
char encrypted_state[PROPERTY_VALUE_MAX];
char key_loc[PROPERTY_VALUE_MAX];
@@ -803,9 +1169,7 @@
return 1;
}
- fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
-
- if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
+ if (get_crypt_ftr_and_key(&crypt_ftr)) {
fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc));
/*
@@ -838,14 +1202,15 @@
{
struct crypt_mnt_ftr crypt_ftr;
/* Allocate enough space for a 256 bit key, but we may use less */
- unsigned char encrypted_master_key[32], decrypted_master_key[32];
- unsigned char salt[SALT_LEN];
+ 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") ) {
@@ -855,7 +1220,7 @@
fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
- if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
+ if (get_crypt_ftr_and_key(&crypt_ftr)) {
SLOGE("Error getting crypt footer and key\n");
return -1;
}
@@ -864,7 +1229,7 @@
orig_failed_decrypt_count = crypt_ftr.failed_decrypt_count;
if (! (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) ) {
- decrypt_master_key(passwd, salt, encrypted_master_key, decrypted_master_key);
+ decrypt_master_key_and_upgrade(passwd, decrypted_master_key, &crypt_ftr);
}
if (create_crypto_blk_dev(&crypt_ftr, decrypted_master_key,
@@ -873,7 +1238,7 @@
return -1;
}
- /* If init detects an encrypted filesystme, it writes a file for each such
+ /* 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
@@ -895,7 +1260,7 @@
}
if (orig_failed_decrypt_count != crypt_ftr.failed_decrypt_count) {
- put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0, 0);
+ put_crypt_ftr_and_key(&crypt_ftr);
}
if (crypt_ftr.failed_decrypt_count) {
@@ -912,7 +1277,6 @@
* the key when we want to change the password on it.
*/
memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES);
- saved_data_blkdev = strdup(real_blkdev);
saved_mount_point = strdup(mount_point);
master_key_saved = 1;
rc = 0;
@@ -941,14 +1305,12 @@
{
char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN];
struct crypt_mnt_ftr sd_crypt_ftr;
- unsigned char key[32], salt[32];
struct stat statbuf;
int nr_sec, fd;
sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor);
- /* Just want the footer, but gotta get it all */
- get_crypt_ftr_and_key(saved_data_blkdev, &sd_crypt_ftr, key, salt);
+ 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);
@@ -991,9 +1353,7 @@
{
struct crypt_mnt_ftr crypt_ftr;
/* Allocate enough space for a 256 bit key, but we may use less */
- unsigned char encrypted_master_key[32], decrypted_master_key[32];
- unsigned char salt[SALT_LEN];
- char real_blkdev[MAXPATHLEN];
+ unsigned char decrypted_master_key[32];
char encrypted_state[PROPERTY_VALUE_MAX];
int rc;
@@ -1013,9 +1373,7 @@
return -1;
}
- fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
-
- if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
+ if (get_crypt_ftr_and_key(&crypt_ftr)) {
SLOGE("Error getting crypt footer and key\n");
return -1;
}
@@ -1024,7 +1382,7 @@
/* If the device has no password, then just say the password is valid */
rc = 0;
} else {
- decrypt_master_key(passwd, salt, encrypted_master_key, decrypted_master_key);
+ 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;
@@ -1045,16 +1403,24 @@
*/
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 = 1;
- ftr->minor_version = 0;
+ ftr->major_version = CURRENT_MAJOR_VERSION;
+ ftr->minor_version = CURRENT_MINOR_VERSION;
ftr->ftr_size = sizeof(struct crypt_mnt_ftr);
- ftr->flags = 0;
ftr->keysize = KEY_LEN_BYTES;
- ftr->spare1 = 0;
- ftr->fs_size = 0;
- ftr->failed_decrypt_count = 0;
- ftr->crypto_type_name[0] = '\0';
+
+ 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)
@@ -1085,20 +1451,6 @@
return rc;
}
-static inline int unix_read(int fd, void* buff, int len)
-{
- int ret;
- do { ret = read(fd, buff, len); } while (ret < 0 && errno == EINTR);
- return ret;
-}
-
-static inline int unix_write(int fd, const void* buff, int len)
-{
- int ret;
- do { ret = write(fd, buff, len); } while (ret < 0 && errno == EINTR);
- return ret;
-}
-
#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,
@@ -1194,10 +1546,10 @@
int how = 0;
char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN], sd_crypto_blkdev[MAXPATHLEN];
unsigned long nr_sec;
- unsigned char master_key[KEY_LEN_BYTES], decrypted_master_key[KEY_LEN_BYTES];
- unsigned char salt[SALT_LEN];
+ unsigned char decrypted_master_key[KEY_LEN_BYTES];
int rc=-1, fd, i, ret;
struct crypt_mnt_ftr crypt_ftr, sd_crypt_ftr;;
+ struct crypt_persist_data *pdata;
char tmpfs_options[PROPERTY_VALUE_MAX];
char encrypted_state[PROPERTY_VALUE_MAX];
char lockid[32] = { 0 };
@@ -1358,6 +1710,7 @@
/* Start the actual work of making an encrypted filesystem */
/* Initialize a crypt_mnt_ftr for the partition */
cryptfs_init_crypt_mnt_ftr(&crypt_ftr);
+
if (!strcmp(key_loc, KEY_IN_FOOTER)) {
crypt_ftr.fs_size = nr_sec - (CRYPT_FOOTER_OFFSET / 512);
} else {
@@ -1367,15 +1720,29 @@
strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256");
/* Make an encrypted master key */
- if (create_encrypted_random_key(passwd, master_key, salt)) {
+ if (create_encrypted_random_key(passwd, crypt_ftr.master_key, crypt_ftr.salt, &crypt_ftr)) {
SLOGE("Cannot create encrypted master key\n");
goto error_unencrypted;
}
/* Write the key to the end of the partition */
- put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, master_key, salt);
+ put_crypt_ftr_and_key(&crypt_ftr);
- decrypt_master_key(passwd, salt, master_key, decrypted_master_key);
+ /* 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_and_upgrade(passwd, decrypted_master_key, &crypt_ftr);
create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev,
"userdata");
@@ -1445,10 +1812,10 @@
/* Clear the encryption in progres flag in the footer */
crypt_ftr.flags &= ~CRYPT_ENCRYPTION_IN_PROGRESS;
- put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, 0, 0);
+ put_crypt_ftr_and_key(&crypt_ftr);
sleep(2); /* Give the UI a chance to show 100% progress */
- android_reboot(ANDROID_RB_RESTART, 0, 0);
+ cryptfs_reboot(0);
} else {
char value[PROPERTY_VALUE_MAX];
@@ -1464,7 +1831,7 @@
} else {
SLOGE("could not open /cache/recovery/command\n");
}
- android_reboot(ANDROID_RB_RESTART2, 0, "recovery");
+ cryptfs_reboot(1);
} else {
/* set property to trigger dialog */
property_set("vold.encrypt_progress", "error_partially_encrypted");
@@ -1495,7 +1862,7 @@
* vold to restart the system.
*/
SLOGE("Error enabling encryption after framework is shutdown, no data changed, restarting system");
- android_reboot(ANDROID_RB_RESTART, 0, 0);
+ cryptfs_reboot(0);
/* shouldn't get here */
property_set("vold.encrypt_progress", "error_shutting_down");
@@ -1509,9 +1876,7 @@
int cryptfs_changepw(char *newpw)
{
struct crypt_mnt_ftr crypt_ftr;
- unsigned char encrypted_master_key[KEY_LEN_BYTES], decrypted_master_key[KEY_LEN_BYTES];
- unsigned char salt[SALT_LEN];
- char real_blkdev[MAXPATHLEN];
+ unsigned char decrypted_master_key[KEY_LEN_BYTES];
/* This is only allowed after we've successfully decrypted the master key */
if (! master_key_saved) {
@@ -1519,22 +1884,156 @@
return -1;
}
- fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev));
- if (strlen(real_blkdev) == 0) {
- SLOGE("Can't find real blkdev");
- return -1;
- }
-
/* get key */
- if (get_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt)) {
+ if (get_crypt_ftr_and_key(&crypt_ftr)) {
SLOGE("Error getting crypt footer and key");
return -1;
}
- encrypt_master_key(newpw, salt, saved_master_key, encrypted_master_key);
+ encrypt_master_key(newpw, crypt_ftr.salt, saved_master_key, crypt_ftr.master_key, &crypt_ftr);
/* save the key */
- put_crypt_ftr_and_key(real_blkdev, &crypt_ftr, encrypted_master_key, salt);
+ 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) {
+ SLOGE("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) {
+ SLOGE("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()) {
+ SLOGE("Setfield error, cannot save persistent data");
+ goto out;
+ }
+ }
+
+ rc = 0;
+
+out:
+ return rc;
+}
diff --git a/cryptfs.h b/cryptfs.h
index 1c1bc1a..421181e 100644
--- a/cryptfs.h
+++ b/cryptfs.h
@@ -15,22 +15,31 @@
*/
/* This structure starts 16,384 bytes before the end of a hardware
- * partition that is encrypted.
- * Immediately following this structure is the encrypted key.
- * The keysize field tells how long the key is, in bytes.
- * Then there is 32 bytes of padding,
- * Finally there is the salt used with the user password.
- * The salt is fixed at 16 bytes long.
+ * partition that is encrypted, or in a separate partition. It's location
+ * is specified by a property set in init.<device>.rc.
+ * The structure allocates 48 bytes for a key, but the real key size is
+ * specified in the struct. Currently, the code is hardcoded to use 128
+ * bit keys.
+ * The fields after salt are only valid in rev 1.1 and later stuctures.
* Obviously, the filesystem does not include the last 16 kbytes
- * of the partition.
+ * of the partition if the crypt_mnt_ftr lives at the end of the
+ * partition.
*/
+#include <cutils/properties.h>
+
+/* The current cryptfs version */
+#define CURRENT_MAJOR_VERSION 1
+#define CURRENT_MINOR_VERSION 2
+
#define CRYPT_FOOTER_OFFSET 0x4000
+#define CRYPT_FOOTER_TO_PERSIST_OFFSET 0x1000
+#define CRYPT_PERSIST_DATA_SIZE 0x1000
#define MAX_CRYPTO_TYPE_NAME_LEN 64
+#define MAX_KEY_LEN 48
#define SALT_LEN 16
-#define KEY_TO_SALT_PADDING 32
/* definitions of flags in the structure below */
#define CRYPT_MNT_KEY_UNENCRYPTED 0x1 /* The key for the partition is not encrypted. */
@@ -38,9 +47,18 @@
* clear when done before rebooting */
#define CRYPT_MNT_MAGIC 0xD0B5B1C4
+#define PERSIST_DATA_MAGIC 0xE950CD44
+
+#define SCRYPT_PROP "ro.crypto.scrypt_params"
+#define SCRYPT_DEFAULTS { 15, 3, 1 }
+
+/* Key Derivation Function algorithms */
+#define KDF_PBKDF2 1
+#define KDF_SCRYPT 2
#define __le32 unsigned int
-#define __le16 unsigned short int
+#define __le16 unsigned short int
+#define __le8 unsigned char
struct crypt_mnt_ftr {
__le32 magic; /* See above */
@@ -56,6 +74,48 @@
unsigned char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption
needed to decrypt this
partition, null terminated */
+ __le32 spare2; /* ignored */
+ unsigned char master_key[MAX_KEY_LEN]; /* The encrypted key for decrypting the filesystem */
+ unsigned char salt[SALT_LEN]; /* The salt used for this encryption */
+ __le64 persist_data_offset[2]; /* Absolute offset to both copies of crypt_persist_data
+ * on device with that info, either the footer of the
+ * real_blkdevice or the metadata partition. */
+
+ __le32 persist_data_size; /* The number of bytes allocated to each copy of the
+ * persistent data table*/
+
+ __le8 kdf_type; /* The key derivation function used. */
+
+ /* scrypt parameters. See www.tarsnap.com/scrypt/scrypt.pdf */
+ __le8 N_factor; /* (1 << N) */
+ __le8 r_factor; /* (1 << r) */
+ __le8 p_factor; /* (1 << p) */
+};
+
+/* Persistant data that should be available before decryption.
+ * Things like airplane mode, locale and timezone are kept
+ * here and can be retrieved by the CryptKeeper UI to properly
+ * configure the phone before asking for the password
+ * This is only valid if the major and minor version above
+ * is set to 1.1 or higher.
+ *
+ * This is a 4K structure. There are 2 copies, and the code alternates
+ * writing one and then clearing the previous one. The reading
+ * code reads the first valid copy it finds, based on the magic number.
+ * The absolute offset to the first of the two copies is kept in rev 1.1
+ * and higher crypt_mnt_ftr structures.
+ */
+struct crypt_persist_entry {
+ char key[PROPERTY_KEY_MAX];
+ char val[PROPERTY_VALUE_MAX];
+};
+
+/* Should be exactly 4K in size */
+struct crypt_persist_data {
+ __le32 persist_magic;
+ __le32 persist_valid_entries;
+ __le32 persist_spare[30];
+ struct crypt_persist_entry persist_entry[0];
};
struct volume_info {
@@ -73,6 +133,9 @@
#ifdef __cplusplus
extern "C" {
#endif
+
+ typedef void (*kdf_func)(char *passwd, unsigned char *salt, unsigned char *ikey, void *params);
+
int cryptfs_crypto_complete(void);
int cryptfs_check_passwd(char *pw);
int cryptfs_verify_passwd(char *newpw);
@@ -83,6 +146,8 @@
char *crypto_dev_path, unsigned int max_pathlen,
int *new_major, int *new_minor);
int cryptfs_revert_volume(const char *label);
+ int cryptfs_getfield(char *fieldname, char *value, int len);
+ int cryptfs_setfield(char *fieldname, char *value);
#ifdef __cplusplus
}
#endif
diff --git a/fstrim.c b/fstrim.c
index 4911778..73705f9 100644
--- a/fstrim.c
+++ b/fstrim.c
@@ -102,8 +102,9 @@
if (ioctl(fd, FITRIM, &range)) {
SLOGE("FITRIM ioctl failed on %s", fstab->recs[i].mount_point);
ret = -1;
+ } else {
+ SLOGI("Trimmed %llu bytes on %s\n", range.len, fstab->recs[i].mount_point);
}
- SLOGI("Trimmed %llu bytes on %s\n", range.len, fstab->recs[i].mount_point);
close(fd);
}