diff options
Diffstat (limited to '')
| -rw-r--r-- | crypto/fde/cryptfs.h (renamed from crypto/lollipop/cryptfs.h) | 119 | ||||
| -rw-r--r-- | crypto/fde/main.cpp (renamed from crypto/lollipop/main.c) | 21 | ||||
| -rw-r--r-- | crypto/lollipop/Android.mk | 62 | ||||
| -rw-r--r-- | crypto/lollipop/cryptfs.c | 1579 |
4 files changed, 67 insertions, 1714 deletions
diff --git a/crypto/lollipop/cryptfs.h b/crypto/fde/cryptfs.h index cd07e5af7..c67113a75 100644 --- a/crypto/lollipop/cryptfs.h +++ b/crypto/fde/cryptfs.h @@ -14,6 +14,9 @@ * limitations under the License. */ +#ifndef ANDROID_VOLD_CRYPTFS_H +#define ANDROID_VOLD_CRYPTFS_H + /* This structure starts 16,384 bytes before the end of a hardware * partition that is encrypted, or in a separate partition. It's location * is specified by a property set in init.<device>.rc. @@ -26,8 +29,9 @@ * partition. */ +#include <stdbool.h> +#include <stdint.h> #include <cutils/properties.h> -#include "openssl/sha.h" /* The current cryptfs version */ #define CURRENT_MAJOR_VERSION 1 @@ -52,6 +56,16 @@ correctly marked partial encryption */ #define CRYPT_DATA_CORRUPT 0x8 /* Set when encryption is fine, but the underlying volume is corrupt */ +#define CRYPT_FORCE_ENCRYPTION 0x10 /* Set when it is time to encrypt this + volume on boot. Everything in this + structure is set up correctly as + though device is encrypted except + that the master key is encrypted with the + default password. */ +#define CRYPT_FORCE_COMPLETE 0x20 /* Set when the above encryption cycle is + complete. On next cryptkeeper entry, match + the password. If it matches fix the master + key and remove this flag. */ #ifdef CONFIG_HW_DISK_ENCRYPTION /* This flag is used to transition from L->M upgrade. L release passed * a byte for every nible of user password while M release is passing @@ -60,6 +74,7 @@ */ #define CRYPT_ASCII_PASSWORD_UPDATED 0x1000 #endif + /* Allowed values for type in the structure below */ #define CRYPT_TYPE_PASSWORD 0 /* master_key is encrypted with a password * Must be zero to be compatible with pre-L @@ -73,14 +88,10 @@ #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 -/* TODO(paullawrence): Remove KDF_SCRYPT_KEYMASTER_UNPADDED and KDF_SCRYPT_KEYMASTER_BADLY_PADDED - * when it is safe to do so. */ +/* Algorithms 3 & 4 deprecated before shipping outside of google, so removed */ #define KDF_SCRYPT_KEYMASTER_UNPADDED 3 #define KDF_SCRYPT_KEYMASTER_BADLY_PADDED 4 #define KDF_SCRYPT_KEYMASTER 5 @@ -91,6 +102,10 @@ /* __le32 and __le16 defined in system/extras/ext4_utils/ext4_utils.h */ #define __le8 unsigned char +#if !defined(SHA256_DIGEST_LENGTH) +#define SHA256_DIGEST_LENGTH 32 +#endif + struct crypt_mnt_ftr { __le32 magic; /* See above */ __le16 major_version; @@ -100,7 +115,7 @@ struct crypt_mnt_ftr { __le32 keysize; /* in bytes */ __le32 crypt_type; /* how master_key is encrypted. Must be a * CRYPT_TYPE_XXX value */ - __le64 fs_size; /* Size of the encrypted fs, in 512 byte sectors */ + __le64 fs_size; /* Size of the encrypted fs, in 512 byte sectors */ __le32 failed_decrypt_count; /* count of # of failed attempts to decrypt and mount, set to 0 on successful mount */ unsigned char crypto_type_name[MAX_CRYPTO_TYPE_NAME_LEN]; /* The type of encryption @@ -151,79 +166,43 @@ struct crypt_mnt_ftr { then we will be OK. */ unsigned char scrypted_intermediate_key[SCRYPT_LEN]; -}; - -/* 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 { - unsigned int size; - unsigned int flags; - struct crypt_mnt_ftr crypt_ftr; - char mnt_point[256]; - char blk_dev[256]; - char crypto_blkdev[256]; - char label[256]; + /* sha of this structure with this element set to zero + Used when encrypting on reboot to validate structure before doing something + fatal + */ + unsigned char sha256[SHA256_DIGEST_LENGTH]; }; -#define VOL_NONREMOVABLE 0x1 -#define VOL_ENCRYPTABLE 0x2 -#define VOL_PRIMARY 0x4 -#define VOL_PROVIDES_ASEC 0x8 #define DATA_MNT_POINT "/data" /* Return values for cryptfs_crypto_complete */ #define CRYPTO_COMPLETE_NOT_ENCRYPTED 1 #define CRYPTO_COMPLETE_ENCRYPTED 0 -#define CRYPTO_COMPLETE_BAD_METADATA -1 -#define CRYPTO_COMPLETE_PARTIAL -2 -#define CRYPTO_COMPLETE_INCONSISTENT -3 -#define CRYPTO_COMPLETE_CORRUPT -4 +#define CRYPTO_COMPLETE_BAD_METADATA (-1) +#define CRYPTO_COMPLETE_PARTIAL (-2) +#define CRYPTO_COMPLETE_INCONSISTENT (-3) +#define CRYPTO_COMPLETE_CORRUPT (-4) /* Return values for cryptfs_enable_inplace*() */ #define ENABLE_INPLACE_OK 0 -#define ENABLE_INPLACE_ERR_OTHER -1 -#define ENABLE_INPLACE_ERR_DEV -2 /* crypto_blkdev issue */ +#define ENABLE_INPLACE_ERR_OTHER (-1) +#define ENABLE_INPLACE_ERR_DEV (-2) /* crypto_blkdev issue */ -#ifdef __cplusplus -extern "C" { -#endif +typedef int (*kdf_func)(const char* passwd, const unsigned char* salt, unsigned char* ikey, + void* params); - typedef int (*kdf_func)(const char *passwd, const unsigned char *salt, - unsigned char *ikey, void *params); - - void set_partition_data(const char* block_device, const char* key_location, const char* fs); - int cryptfs_check_footer(); - int cryptfs_check_passwd(char *pw); - int cryptfs_verify_passwd(char *newpw); - int cryptfs_get_password_type(void); - int delete_crypto_blk_dev(char *name); - int cryptfs_setup_ext_volume(const char* label, const char* real_blkdev, - const unsigned char* key, int keysize, char* out_crypto_blkdev); - int cryptfs_revert_ext_volume(const char* label); -#ifdef __cplusplus -} -#endif +int cryptfs_check_passwd(const char* pw); +int cryptfs_verify_passwd(const char* pw); +int cryptfs_setup_ext_volume(const char* label, const char* real_blkdev, const unsigned char* key, int keysize, char* out_crypto_blkdev); +int cryptfs_revert_ext_volume(const char* label); +int cryptfs_get_password_type(void); + +uint32_t cryptfs_get_keysize(); +const char* cryptfs_get_crypto_name(); + +void set_partition_data(const char* block_device, const char* key_location, const char* fs); +int cryptfs_check_footer(); +int delete_crypto_blk_dev(const char *name); + +#endif /* ANDROID_VOLD_CRYPTFS_H */ diff --git a/crypto/lollipop/main.c b/crypto/fde/main.cpp index 232afb959..7051a6d7b 100644 --- a/crypto/lollipop/main.c +++ b/crypto/fde/main.cpp @@ -24,9 +24,24 @@ #include "cutils/properties.h" #include "crypto_scrypt.h" -int main() { - set_partition_data("/dev/block/platform/sdhci-tegra.3/by-name/UDA", "/dev/block/platform/sdhci-tegra.3/by-name/MD1", "f2fs"); +void usage() { + printf(" Usage:\n"); + printf(" twrpdec /path/to/userdata /path/to/metadata filesystem password\n"); + printf("\n"); + printf(" The metadata path is the path to the footer. If no metadata\n"); + printf(" partition is present then use footer for this argument.\n"); + printf("\n"); + printf(" Example:\n"); + printf(" twrpdec /dev/block/bootdevice/by-name/userdata footer ext4 0000\n"); +} + +int main(int argc, char **argv) { + if (argc != 5) { + usage(); + return -1; + } + set_partition_data(argv[1], argv[2], argv[3]); //int ret = cryptfs_check_passwd("30303030"); - int ret = cryptfs_check_passwd("0000"); + int ret = cryptfs_check_passwd(argv[4]); return 0; } diff --git a/crypto/lollipop/Android.mk b/crypto/lollipop/Android.mk deleted file mode 100644 index 1be412138..000000000 --- a/crypto/lollipop/Android.mk +++ /dev/null @@ -1,62 +0,0 @@ -LOCAL_PATH := $(call my-dir) -ifeq ($(TW_INCLUDE_CRYPTO), true) -include $(CLEAR_VARS) - -LOCAL_MODULE := libcryptfslollipop -LOCAL_MODULE_TAGS := eng optional -LOCAL_CFLAGS := -LOCAL_SRC_FILES = cryptfs.c -LOCAL_SHARED_LIBRARIES := libcrypto libhardware libcutils -LOCAL_C_INCLUDES := external/openssl/include $(commands_recovery_local_path)/crypto/scrypt/lib/crypto - -ifeq ($(TARGET_HW_DISK_ENCRYPTION),true) - ifeq ($(TARGET_CRYPTFS_HW_PATH),) - LOCAL_C_INCLUDES += device/qcom/common/cryptfs_hw - else - LOCAL_C_INCLUDES += $(TARGET_CRYPTFS_HW_PATH) - endif - LOCAL_SHARED_LIBRARIES += libcryptfs_hw - LOCAL_CFLAGS += -DCONFIG_HW_DISK_ENCRYPTION -endif - -ifneq ($(wildcard hardware/libhardware/include/hardware/keymaster0.h),) - LOCAL_CFLAGS += -DTW_CRYPTO_HAVE_KEYMASTERX - LOCAL_C_INCLUDES += external/boringssl/src/include -endif - -LOCAL_CFLAGS += -Wno-unused-function - -LOCAL_WHOLE_STATIC_LIBRARIES += libscrypttwrp_static - -include $(BUILD_SHARED_LIBRARY) - - - -include $(CLEAR_VARS) -LOCAL_MODULE := twrpdec -LOCAL_MODULE_TAGS := optional -LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES -LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin -LOCAL_SRC_FILES := main.c cryptfs.c -LOCAL_SHARED_LIBRARIES := libcrypto libhardware libcutils libc -LOCAL_C_INCLUDES := external/openssl/include $(commands_recovery_local_path)/crypto/scrypt/lib/crypto - -ifeq ($(TARGET_HW_DISK_ENCRYPTION),true) - ifeq ($(TARGET_CRYPTFS_HW_PATH),) - LOCAL_C_INCLUDES += device/qcom/common/cryptfs_hw - else - LOCAL_C_INCLUDES += $(TARGET_CRYPTFS_HW_PATH) - endif - LOCAL_SHARED_LIBRARIES += libcryptfs_hw - LOCAL_CFLAGS += -DCONFIG_HW_DISK_ENCRYPTION -endif - -ifneq ($(wildcard hardware/libhardware/include/hardware/keymaster0.h),) - LOCAL_CFLAGS += -DTW_CRYPTO_HAVE_KEYMASTERX - LOCAL_C_INCLUDES += external/boringssl/src/include -endif - -LOCAL_WHOLE_STATIC_LIBRARIES += libscrypttwrp_static -include $(BUILD_EXECUTABLE) - -endif diff --git a/crypto/lollipop/cryptfs.c b/crypto/lollipop/cryptfs.c deleted file mode 100644 index d3bf62955..000000000 --- a/crypto/lollipop/cryptfs.c +++ /dev/null @@ -1,1579 +0,0 @@ -/* - * Copyright (C) 2010 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/* TO DO: - * 1. Perhaps keep several copies of the encrypted key, in case something - * goes horribly wrong? - * - */ - -#include <sys/types.h> -#include <linux/types.h> -#include <sys/wait.h> -#include <sys/stat.h> -#include <ctype.h> -#include <fcntl.h> -#include <inttypes.h> -#include <unistd.h> -#include <stdio.h> -#include <sys/ioctl.h> -#include <linux/dm-ioctl.h> -#include <libgen.h> -#include <stdlib.h> -#include <sys/param.h> -#include <string.h> -#include <sys/mount.h> -#include <openssl/evp.h> -#include <errno.h> -#include <linux/kdev_t.h> -#include <time.h> -#include "cryptfs.h" -#include "cutils/properties.h" -#include "crypto_scrypt.h" - -#ifndef TW_CRYPTO_HAVE_KEYMASTERX -#include <hardware/keymaster.h> -#else -#include <stdbool.h> -#include <openssl/evp.h> -#include <openssl/sha.h> -#include <hardware/keymaster0.h> -#include <hardware/keymaster1.h> -#endif - -#ifndef min /* already defined by windows.h */ -#define min(a, b) ((a) < (b) ? (a) : (b)) -#endif - -#define UNUSED __attribute__((unused)) - -#define UNUSED __attribute__((unused)) - -#ifdef CONFIG_HW_DISK_ENCRYPTION -#include "cryptfs_hw.h" -#endif - -#define DM_CRYPT_BUF_SIZE 4096 - -#define HASH_COUNT 2000 -#define KEY_LEN_BYTES 16 -#define IV_LEN_BYTES 16 - -#define KEY_IN_FOOTER "footer" - -#define EXT4_FS 1 -#define F2FS_FS 2 - -#define TABLE_LOAD_RETRIES 10 - -#define RSA_KEY_SIZE 2048 -#define RSA_KEY_SIZE_BYTES (RSA_KEY_SIZE / 8) -#define RSA_EXPONENT 0x10001 -#define KEYMASTER_CRYPTFS_RATE_LIMIT 1 // Maximum one try per second - -#define RETRY_MOUNT_ATTEMPTS 10 -#define RETRY_MOUNT_DELAY_SECONDS 1 - -char *me = "cryptfs"; - -static int master_key_saved = 0; -static char key_fname[PROPERTY_VALUE_MAX] = ""; -static char real_blkdev[PROPERTY_VALUE_MAX] = ""; -static char file_system[PROPERTY_VALUE_MAX] = ""; - -#ifdef CONFIG_HW_DISK_ENCRYPTION -static int scrypt_keymaster(const char *passwd, const unsigned char *salt, - unsigned char *ikey, void *params); -static void convert_key_to_hex_ascii(const unsigned char *master_key, - unsigned int keysize, char *master_key_ascii); -static int get_keymaster_hw_fde_passwd(const char* passwd, unsigned char* newpw, - unsigned char* salt, - const struct crypt_mnt_ftr *ftr) -{ - /* if newpw updated, return 0 - * if newpw not updated return -1 - */ - int rc = -1; - - if (should_use_keymaster()) { - if (scrypt_keymaster(passwd, salt, newpw, (void*)ftr)) { - printf("scrypt failed"); - } else { - rc = 0; - } - } - - return rc; -} - -static int verify_hw_fde_passwd(char *passwd, struct crypt_mnt_ftr* crypt_ftr) -{ - unsigned char newpw[32] = {0}; - int key_index; - if (get_keymaster_hw_fde_passwd(passwd, newpw, crypt_ftr->salt, crypt_ftr)) - key_index = set_hw_device_encryption_key(passwd, - (char*) crypt_ftr->crypto_type_name); - else - key_index = set_hw_device_encryption_key((const char*)newpw, - (char*) crypt_ftr->crypto_type_name); - return key_index; -} -#endif - -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); -} - -#ifndef TW_CRYPTO_HAVE_KEYMASTERX -static int keymaster_init(keymaster_device_t **keymaster_dev) -{ - int rc; - - const hw_module_t* mod; - rc = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &mod); - if (rc) { - printf("could not find any keystore module\n"); - goto out; - } - - rc = keymaster_open(mod, keymaster_dev); - if (rc) { - printf("could not open keymaster device in %s (%s)\n", - KEYSTORE_HARDWARE_MODULE_ID, strerror(-rc)); - goto out; - } - - return 0; - -out: - *keymaster_dev = NULL; - return rc; -} - -/* Should we use keymaster? */ -static int keymaster_check_compatibility() -{ - keymaster_device_t *keymaster_dev = 0; - int rc = 0; - - if (keymaster_init(&keymaster_dev)) { - printf("Failed to init keymaster\n"); - rc = -1; - goto out; - } - - printf("keymaster version is %d\n", keymaster_dev->common.module->module_api_version); - -#if (KEYMASTER_HEADER_VERSION >= 3) - if (keymaster_dev->common.module->module_api_version - < KEYMASTER_MODULE_API_VERSION_0_3) { - rc = 0; - goto out; - } - - if (keymaster_dev->flags & KEYMASTER_BLOBS_ARE_STANDALONE) { - rc = 1; - } - -#endif -out: - keymaster_close(keymaster_dev); - return rc; -} - -/* Create a new keymaster key and store it in this footer */ -static int keymaster_create_key(struct crypt_mnt_ftr *ftr) -{ - uint8_t* key = 0; - keymaster_device_t *keymaster_dev = 0; - - if (keymaster_init(&keymaster_dev)) { - printf("Failed to init keymaster\n"); - return -1; - } - - int rc = 0; - - keymaster_rsa_keygen_params_t params; - memset(¶ms, '\0', sizeof(params)); - params.public_exponent = RSA_EXPONENT; - params.modulus_size = RSA_KEY_SIZE; - - size_t key_size; - if (keymaster_dev->generate_keypair(keymaster_dev, TYPE_RSA, ¶ms, - &key, &key_size)) { - printf("Failed to generate keypair\n"); - rc = -1; - goto out; - } - - if (key_size > KEYMASTER_BLOB_SIZE) { - printf("Keymaster key too large for crypto footer\n"); - rc = -1; - goto out; - } - - memcpy(ftr->keymaster_blob, key, key_size); - ftr->keymaster_blob_size = key_size; - -out: - keymaster_close(keymaster_dev); - free(key); - return rc; -} - -/* This signs the given object using the keymaster key. */ -static int keymaster_sign_object(struct crypt_mnt_ftr *ftr, - const unsigned char *object, - const size_t object_size, - unsigned char **signature, - size_t *signature_size) -{ - int rc = 0; - keymaster_device_t *keymaster_dev = 0; - if (keymaster_init(&keymaster_dev)) { - printf("Failed to init keymaster\n"); - return -1; - } - - /* We currently set the digest type to DIGEST_NONE because it's the - * only supported value for keymaster. A similar issue exists with - * PADDING_NONE. Long term both of these should likely change. - */ - keymaster_rsa_sign_params_t params; - params.digest_type = DIGEST_NONE; - params.padding_type = PADDING_NONE; - - unsigned char to_sign[RSA_KEY_SIZE_BYTES]; - size_t to_sign_size = sizeof(to_sign); - memset(to_sign, 0, RSA_KEY_SIZE_BYTES); - - // To sign a message with RSA, the message must satisfy two - // constraints: - // - // 1. The message, when interpreted as a big-endian numeric value, must - // be strictly less than the public modulus of the RSA key. Note - // that because the most significant bit of the public modulus is - // guaranteed to be 1 (else it's an (n-1)-bit key, not an n-bit - // key), an n-bit message with most significant bit 0 always - // satisfies this requirement. - // - // 2. The message must have the same length in bits as the public - // modulus of the RSA key. This requirement isn't mathematically - // necessary, but is necessary to ensure consistency in - // implementations. - switch (ftr->kdf_type) { - case KDF_SCRYPT_KEYMASTER_UNPADDED: - // This is broken: It produces a message which is shorter than - // the public modulus, failing criterion 2. - memcpy(to_sign, object, object_size); - to_sign_size = object_size; - printf("Signing unpadded object\n"); - break; - case KDF_SCRYPT_KEYMASTER_BADLY_PADDED: - // This is broken: Since the value of object is uniformly - // distributed, it produces a message that is larger than the - // public modulus with probability 0.25. - memcpy(to_sign, object, min(RSA_KEY_SIZE_BYTES, object_size)); - printf("Signing end-padded object\n"); - break; - case KDF_SCRYPT_KEYMASTER: - // This ensures the most significant byte of the signed message - // is zero. We could have zero-padded to the left instead, but - // this approach is slightly more robust against changes in - // object size. However, it's still broken (but not unusably - // so) because we really should be using a proper RSA padding - // function, such as OAEP. - // - // TODO(paullawrence): When keymaster 0.4 is available, change - // this to use the padding options it provides. - memcpy(to_sign + 1, object, min(RSA_KEY_SIZE_BYTES - 1, object_size)); - printf("Signing safely-padded object\n"); - break; - default: - printf("Unknown KDF type %d\n", ftr->kdf_type); - return -1; - } - - rc = keymaster_dev->sign_data(keymaster_dev, - ¶ms, - ftr->keymaster_blob, - ftr->keymaster_blob_size, - to_sign, - to_sign_size, - signature, - signature_size); - - keymaster_close(keymaster_dev); - return rc; -} -#else //#ifndef TW_CRYPTO_HAVE_KEYMASTERX -static int keymaster_init(keymaster0_device_t **keymaster0_dev, - keymaster1_device_t **keymaster1_dev) -{ - int rc; - - const hw_module_t* mod; - rc = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &mod); - if (rc) { - printf("could not find any keystore module\n"); - goto err; - } - - printf("keymaster module name is %s\n", mod->name); - printf("keymaster version is %d\n", mod->module_api_version); - - *keymaster0_dev = NULL; - *keymaster1_dev = NULL; - if (mod->module_api_version == KEYMASTER_MODULE_API_VERSION_1_0) { - printf("Found keymaster1 module, using keymaster1 API.\n"); - rc = keymaster1_open(mod, keymaster1_dev); - } else { - printf("Found keymaster0 module, using keymaster0 API.\n"); - rc = keymaster0_open(mod, keymaster0_dev); - } - - if (rc) { - printf("could not open keymaster device in %s (%s)\n", - KEYSTORE_HARDWARE_MODULE_ID, strerror(-rc)); - goto err; - } - - return 0; - -err: - *keymaster0_dev = NULL; - *keymaster1_dev = NULL; - return rc; -} - -/* Should we use keymaster? */ -static int keymaster_check_compatibility() -{ - keymaster0_device_t *keymaster0_dev = 0; - keymaster1_device_t *keymaster1_dev = 0; - int rc = 0; - - if (keymaster_init(&keymaster0_dev, &keymaster1_dev)) { - printf("Failed to init keymaster\n"); - rc = -1; - goto out; - } - - if (keymaster1_dev) { - rc = 1; - goto out; - } - - // TODO(swillden): Check to see if there's any reason to require v0.3. I think v0.1 and v0.2 - // should work. - if (keymaster0_dev->common.module->module_api_version - < KEYMASTER_MODULE_API_VERSION_0_3) { - rc = 0; - goto out; - } - - if (!(keymaster0_dev->flags & KEYMASTER_SOFTWARE_ONLY) && - (keymaster0_dev->flags & KEYMASTER_BLOBS_ARE_STANDALONE)) { - rc = 1; - } - -out: - if (keymaster1_dev) { - keymaster1_close(keymaster1_dev); - } - if (keymaster0_dev) { - keymaster0_close(keymaster0_dev); - } - return rc; -} - -/* Create a new keymaster key and store it in this footer */ -static int keymaster_create_key(struct crypt_mnt_ftr *ftr) -{ - uint8_t* key = 0; - keymaster0_device_t *keymaster0_dev = 0; - keymaster1_device_t *keymaster1_dev = 0; - - if (keymaster_init(&keymaster0_dev, &keymaster1_dev)) { - printf("Failed to init keymaster\n"); - return -1; - } - - int rc = 0; - size_t key_size = 0; - if (keymaster1_dev) { - keymaster_key_param_t params[] = { - /* Algorithm & size specifications. Stick with RSA for now. Switch to AES later. */ - keymaster_param_enum(KM_TAG_ALGORITHM, KM_ALGORITHM_RSA), - keymaster_param_int(KM_TAG_KEY_SIZE, RSA_KEY_SIZE), - keymaster_param_long(KM_TAG_RSA_PUBLIC_EXPONENT, RSA_EXPONENT), - - /* The only allowed purpose for this key is signing. */ - keymaster_param_enum(KM_TAG_PURPOSE, KM_PURPOSE_SIGN), - - /* Padding & digest specifications. */ - keymaster_param_enum(KM_TAG_PADDING, KM_PAD_NONE), - keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_NONE), - - /* Require that the key be usable in standalone mode. File system isn't available. */ - keymaster_param_enum(KM_TAG_BLOB_USAGE_REQUIREMENTS, KM_BLOB_STANDALONE), - - /* No auth requirements, because cryptfs is not yet integrated with gatekeeper. */ - keymaster_param_bool(KM_TAG_NO_AUTH_REQUIRED), - - /* Rate-limit key usage attempts, to rate-limit brute force */ - keymaster_param_int(KM_TAG_MIN_SECONDS_BETWEEN_OPS, KEYMASTER_CRYPTFS_RATE_LIMIT), - }; - keymaster_key_param_set_t param_set = { params, sizeof(params)/sizeof(*params) }; - keymaster_key_blob_t key_blob; - keymaster_error_t error = keymaster1_dev->generate_key(keymaster1_dev, ¶m_set, - &key_blob, - NULL /* characteristics */); - if (error != KM_ERROR_OK) { - printf("Failed to generate keymaster1 key, error %d\n", error); - rc = -1; - goto out; - } - - key = (uint8_t*)key_blob.key_material; - key_size = key_blob.key_material_size; - } - else if (keymaster0_dev) { - keymaster_rsa_keygen_params_t params; - memset(¶ms, '\0', sizeof(params)); - params.public_exponent = RSA_EXPONENT; - params.modulus_size = RSA_KEY_SIZE; - - if (keymaster0_dev->generate_keypair(keymaster0_dev, TYPE_RSA, ¶ms, - &key, &key_size)) { - printf("Failed to generate keypair\n"); - rc = -1; - goto out; - } - } else { - printf("Cryptfs bug: keymaster_init succeeded but didn't initialize a device\n"); - rc = -1; - goto out; - } - - if (key_size > KEYMASTER_BLOB_SIZE) { - printf("Keymaster key too large for crypto footer\n"); - rc = -1; - goto out; - } - - memcpy(ftr->keymaster_blob, key, key_size); - ftr->keymaster_blob_size = key_size; - -out: - if (keymaster0_dev) - keymaster0_close(keymaster0_dev); - if (keymaster1_dev) - keymaster1_close(keymaster1_dev); - free(key); - return rc; -} - -/* This signs the given object using the keymaster key. */ -static int keymaster_sign_object(struct crypt_mnt_ftr *ftr, - const unsigned char *object, - const size_t object_size, - unsigned char **signature, - size_t *signature_size) -{ - int rc = 0; - keymaster0_device_t *keymaster0_dev = 0; - keymaster1_device_t *keymaster1_dev = 0; - if (keymaster_init(&keymaster0_dev, &keymaster1_dev)) { - printf("Failed to init keymaster\n"); - rc = -1; - goto out; - } - - unsigned char to_sign[RSA_KEY_SIZE_BYTES]; - size_t to_sign_size = sizeof(to_sign); - memset(to_sign, 0, RSA_KEY_SIZE_BYTES); - - // To sign a message with RSA, the message must satisfy two - // constraints: - // - // 1. The message, when interpreted as a big-endian numeric value, must - // be strictly less than the public modulus of the RSA key. Note - // that because the most significant bit of the public modulus is - // guaranteed to be 1 (else it's an (n-1)-bit key, not an n-bit - // key), an n-bit message with most significant bit 0 always - // satisfies this requirement. - // - // 2. The message must have the same length in bits as the public - // modulus of the RSA key. This requirement isn't mathematically - // necessary, but is necessary to ensure consistency in - // implementations. - switch (ftr->kdf_type) { - case KDF_SCRYPT_KEYMASTER: - // This ensures the most significant byte of the signed message - // is zero. We could have zero-padded to the left instead, but - // this approach is slightly more robust against changes in - // object size. However, it's still broken (but not unusably - // so) because we really should be using a proper deterministic - // RSA padding function, such as PKCS1. - memcpy(to_sign + 1, object, min(RSA_KEY_SIZE_BYTES - 1, object_size)); - printf("Signing safely-padded object\n"); - break; - default: - printf("Unknown KDF type %d\n", ftr->kdf_type); - rc = -1; - goto out; - } - - if (keymaster0_dev) { - keymaster_rsa_sign_params_t params; - params.digest_type = DIGEST_NONE; - params.padding_type = PADDING_NONE; - - rc = keymaster0_dev->sign_data(keymaster0_dev, - ¶ms, - ftr->keymaster_blob, - ftr->keymaster_blob_size, - to_sign, - to_sign_size, - signature, - signature_size); - goto out; - } else if (keymaster1_dev) { - keymaster_key_blob_t key = { ftr->keymaster_blob, ftr->keymaster_blob_size }; - keymaster_key_param_t params[] = { - keymaster_param_enum(KM_TAG_PADDING, KM_PAD_NONE), - keymaster_param_enum(KM_TAG_DIGEST, KM_DIGEST_NONE), - }; - keymaster_key_param_set_t param_set = { params, sizeof(params)/sizeof(*params) }; - keymaster_operation_handle_t op_handle; - keymaster_error_t error = keymaster1_dev->begin(keymaster1_dev, KM_PURPOSE_SIGN, &key, - ¶m_set, NULL /* out_params */, - &op_handle); - if (error == KM_ERROR_KEY_RATE_LIMIT_EXCEEDED) { - // Key usage has been rate-limited. Wait a bit and try again. - sleep(KEYMASTER_CRYPTFS_RATE_LIMIT); - error = keymaster1_dev->begin(keymaster1_dev, KM_PURPOSE_SIGN, &key, - ¶m_set, NULL /* out_params */, - &op_handle); - } - if (error != KM_ERROR_OK) { - printf("Error starting keymaster signature transaction: %d\n", error); - rc = -1; - goto out; - } - - keymaster_blob_t input = { to_sign, to_sign_size }; - size_t input_consumed; - error = keymaster1_dev->update(keymaster1_dev, op_handle, NULL /* in_params */, - &input, &input_consumed, NULL /* out_params */, - NULL /* output */); - if (error != KM_ERROR_OK) { - printf("Error sending data to keymaster signature transaction: %d\n", error); - rc = -1; - goto out; - } - if (input_consumed != to_sign_size) { - // This should never happen. If it does, it's a bug in the keymaster implementation. - printf("Keymaster update() did not consume all data.\n"); - keymaster1_dev->abort(keymaster1_dev, op_handle); - rc = -1; - goto out; - } - - keymaster_blob_t tmp_sig; - error = keymaster1_dev->finish(keymaster1_dev, op_handle, NULL /* in_params */, - NULL /* verify signature */, NULL /* out_params */, - &tmp_sig); - if (error != KM_ERROR_OK) { - printf("Error finishing keymaster signature transaction: %d\n", error); - rc = -1; - goto out; - } - - *signature = (uint8_t*)tmp_sig.data; - *signature_size = tmp_sig.data_length; - } else { - printf("Cryptfs bug: keymaster_init succeded but didn't initialize a device.\n"); - rc = -1; - goto out; - } - - out: - if (keymaster1_dev) - keymaster1_close(keymaster1_dev); - if (keymaster0_dev) - keymaster0_close(keymaster0_dev); - - return rc; -} -#endif //#ifndef TW_CRYPTO_HAVE_KEYMASTERX - -static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) -{ - memset(io, 0, dataSize); - io->data_size = dataSize; - io->data_start = sizeof(struct dm_ioctl); - io->version[0] = 4; - io->version[1] = 0; - io->version[2] = 0; - io->flags = flags; - if (name) { - strncpy(io->name, name, sizeof(io->name)); - } -} - -/** - * Gets the default device scrypt parameters for key derivation time tuning. - * The parameters should lead to about one second derivation time for the - * given device. - */ -static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) { - const int default_params[] = SCRYPT_DEFAULTS; - int params[] = SCRYPT_DEFAULTS; - char paramstr[PROPERTY_VALUE_MAX]; - char *token; - char *saveptr; - int i; - - property_get(SCRYPT_PROP, paramstr, ""); - if (paramstr[0] != '\0') { - /* - * The token we're looking for should be three integers separated by - * colons (e.g., "12:8:1"). Scan the property to make sure it matches. - */ - for (i = 0, token = strtok_r(paramstr, ":", &saveptr); - token != NULL && i < 3; - i++, token = strtok_r(NULL, ":", &saveptr)) { - char *endptr; - params[i] = strtol(token, &endptr, 10); - - /* - * Check that there was a valid number and it's 8-bit. If not, - * break out and the end check will take the default values. - */ - if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) { - break; - } - } - - /* - * If there were not enough tokens or a token was malformed (not an - * integer), it will end up here and the default parameters can be - * taken. - */ - if ((i != 3) || (token != NULL)) { - printf("bad scrypt parameters '%s' should be like '12:8:1'; using defaults\n", 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_blkdev_size(int fd) -{ - unsigned long nr_sec; - - if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { - nr_sec = 0; - } - - return (unsigned int) nr_sec; -} - -static int get_crypt_ftr_info(char **metadata_fname, off64_t *off) -{ - static int cached_data = 0; - static off64_t cached_off = 0; - static char cached_metadata_fname[PROPERTY_VALUE_MAX] = ""; - int fd; - unsigned int nr_sec; - int rc = -1; - - if (!cached_data) { - 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; - } - - if ((nr_sec = get_blkdev_size(fd))) { - /* If it's an encrypted Android partition, the last 16 Kbytes contain the - * encryption info footer and key, and plenty of bytes to spare for future - * growth. - */ - strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname)); - cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; - cached_data = 1; - } else { - printf("Cannot get size of block device %s\n", real_blkdev); - } - close(fd); - } else { - strlcpy(cached_metadata_fname, key_fname, sizeof(cached_metadata_fname)); - cached_off = 0; - cached_data = 1; - } - } - - if (cached_data) { - if (metadata_fname) { - *metadata_fname = cached_metadata_fname; - } - if (off) { - *off = cached_off; - } - rc = 0; - } - - return rc; -} - -static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) -{ - int fd; - unsigned int cnt; - off64_t starting_off; - int rc = -1; - char *fname = NULL; - struct stat statbuf; - - if (get_crypt_ftr_info(&fname, &starting_off)) { - printf("Unable to get crypt_ftr_info\n"); - return -1; - } - if (fname[0] != '/') { - printf("Unexpected value for crypto key location\n"); - return -1; - } - if ( (fd = open(fname, O_RDWR)) < 0) { - printf("Cannot open footer file %s for get\n", fname); - return -1; - } - - /* Make sure it's 16 Kbytes in length */ - fstat(fd, &statbuf); - if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { - printf("footer file %s is not the expected size!\n", fname); - goto errout; - } - - /* Seek to the start of the crypt footer */ - if (lseek64(fd, starting_off, SEEK_SET) == -1) { - printf("Cannot seek to real block device footer\n"); - goto errout; - } - - if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { - printf("Cannot read real block device footer\n"); - goto errout; - } - - if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { - printf("Bad magic for real block device %s\n", fname); - goto errout; - } - - if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) { - printf("Cannot understand major version %d real block device footer; expected %d\n", - crypt_ftr->major_version, CURRENT_MAJOR_VERSION); - goto errout; - } - - if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) { - printf("Warning: crypto footer minor version %d, expected <= %d, continuing...\n", - crypt_ftr->minor_version, CURRENT_MINOR_VERSION); - } - - /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the - * copy on disk before returning. - */ - /*if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) { - upgrade_crypt_ftr(fd, crypt_ftr, starting_off); - }*/ - - /* Success! */ - rc = 0; - -errout: - close(fd); - return rc; -} - -static int hexdigit (char c) -{ - if (c >= '0' && c <= '9') return c - '0'; - c = tolower(c); - if (c >= 'a' && c <= 'f') return c - 'a' + 10; - return -1; -} - -static unsigned char* convert_hex_ascii_to_key(const char* master_key_ascii, - unsigned int* out_keysize) -{ - unsigned int i; - *out_keysize = 0; - - size_t size = strlen (master_key_ascii); - if (size % 2) { - printf("Trying to convert ascii string of odd length\n"); - return NULL; - } - - unsigned char* master_key = (unsigned char*) malloc(size / 2); - if (master_key == 0) { - printf("Cannot allocate\n"); - return NULL; - } - - for (i = 0; i < size; i += 2) { - int high_nibble = hexdigit (master_key_ascii[i]); - int low_nibble = hexdigit (master_key_ascii[i + 1]); - - if(high_nibble < 0 || low_nibble < 0) { - printf("Invalid hex string\n"); - free (master_key); - return NULL; - } - - master_key[*out_keysize] = high_nibble * 16 + low_nibble; - (*out_keysize)++; - } - - return master_key; -} - -/* Convert a binary key of specified length into an ascii hex string equivalent, - * without the leading 0x and with null termination - */ -static void convert_key_to_hex_ascii(const unsigned char *master_key, - unsigned int keysize, char *master_key_ascii) { - unsigned int i, a; - unsigned char nibble; - - for (i=0, a=0; i<keysize; i++, a+=2) { - /* For each byte, write out two ascii hex digits */ - nibble = (master_key[i] >> 4) & 0xf; - master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); - - nibble = master_key[i] & 0xf; - master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); - } - - /* Add the null termination */ - master_key_ascii[a] = '\0'; - -} - -static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, const unsigned char *master_key, - const char *real_blk_name, const char *name, int fd, - char *extra_params) -{ - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - struct dm_target_spec *tgt; - char *crypt_params; - char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ - int i; - - io = (struct dm_ioctl *) buffer; - - /* Load the mapping table for this device */ - tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - io->target_count = 1; - tgt->status = 0; - tgt->sector_start = 0; - tgt->length = crypt_ftr->fs_size; - crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); - -#ifdef CONFIG_HW_DISK_ENCRYPTION - if(is_hw_disk_encryption((char*)crypt_ftr->crypto_type_name)) { - strlcpy(tgt->target_type, "req-crypt",DM_MAX_TYPE_NAME); - if (is_ice_enabled()) - convert_key_to_hex_ascii(master_key, sizeof(int), master_key_ascii); - else - convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); - } - else { - convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); - strlcpy(tgt->target_type, "crypt", DM_MAX_TYPE_NAME); - } -#else - convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); - strlcpy(tgt->target_type, "crypt", DM_MAX_TYPE_NAME); -#endif - - sprintf(crypt_params, "%s %s 0 %s 0 %s", crypt_ftr->crypto_type_name, - master_key_ascii, real_blk_name, extra_params); - - printf("%s: target_type = %s\n", __func__, tgt->target_type); - printf("%s: real_blk_name = %s, extra_params = %s\n", __func__, real_blk_name, extra_params); - - crypt_params += strlen(crypt_params) + 1; - crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ - tgt->next = crypt_params - buffer; - - for (i = 0; i < TABLE_LOAD_RETRIES; i++) { - if (! ioctl(fd, DM_TABLE_LOAD, io)) { - break; - } - printf("%i\n", errno); - usleep(500000); - } - - if (i == TABLE_LOAD_RETRIES) { - /* We failed to load the table, return an error */ - return -1; - } else { - return i + 1; - } -} - - -static int get_dm_crypt_version(int fd, const char *name, int *version) -{ - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - struct dm_target_versions *v; - - io = (struct dm_ioctl *) buffer; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - - if (ioctl(fd, DM_LIST_VERSIONS, io)) { - return -1; - } - - /* Iterate over the returned versions, looking for name of "crypt". - * When found, get and return the version. - */ - v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)]; - while (v->next) { -#ifdef CONFIG_HW_DISK_ENCRYPTION - int flag; - if (is_hw_fde_enabled()) { - flag = (!strcmp(v->name, "crypt") || !strcmp(v->name, "req-crypt")); - } else { - flag = (!strcmp(v->name, "crypt")); - } - printf("get_dm_crypt_version flag: %i, name: '%s'\n", flag, v->name); - if (flag) { -#else - if (! strcmp(v->name, "crypt")) { -#endif - /* We found the crypt driver, return the version, and get out */ - version[0] = v->version[0]; - version[1] = v->version[1]; - version[2] = v->version[2]; - return 0; - } - v = (struct dm_target_versions *)(((char *)v) + v->next); - } - - return -1; -} - -static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, const unsigned char *master_key, - const char *real_blk_name, char *crypto_blk_name, const char *name) -{ - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - unsigned int minor; - int fd=0; - int retval = -1; - int version[3]; - char *extra_params; - int load_count; -#ifdef CONFIG_HW_DISK_ENCRYPTION - char encrypted_state[PROPERTY_VALUE_MAX] = {0}; - char progress[PROPERTY_VALUE_MAX] = {0}; -#endif - - if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { - printf("Cannot open device-mapper\n"); - goto errout; - } - - io = (struct dm_ioctl *) buffer; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_CREATE, io)) { - printf("Cannot create dm-crypt device %i\n", errno); - goto errout; - } - - /* Get the device status, in particular, the name of it's device file */ - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_STATUS, io)) { - printf("Cannot retrieve dm-crypt device status\n"); - goto errout; - } - minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); - snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); - -#ifdef CONFIG_HW_DISK_ENCRYPTION - if(is_hw_disk_encryption((char*)crypt_ftr->crypto_type_name)) { - /* Set fde_enabled if either FDE completed or in-progress */ - property_get("ro.crypto.state", encrypted_state, ""); /* FDE completed */ - property_get("vold.encrypt_progress", progress, ""); /* FDE in progress */ - if (!strcmp(encrypted_state, "encrypted") || strcmp(progress, "")) { - if (is_ice_enabled()) - extra_params = "fde_enabled ice"; - else - extra_params = "fde_enabled"; - } else - extra_params = "fde_disabled"; - } else { - extra_params = ""; - if (! get_dm_crypt_version(fd, name, version)) { - /* Support for allow_discards was added in version 1.11.0 */ - if ((version[0] >= 2) || - ((version[0] == 1) && (version[1] >= 11))) { - extra_params = "1 allow_discards"; - printf("Enabling support for allow_discards in dmcrypt.\n"); - } - } - } -#else - extra_params = ""; - if (! get_dm_crypt_version(fd, name, version)) { - /* Support for allow_discards was added in version 1.11.0 */ - if ((version[0] >= 2) || - ((version[0] == 1) && (version[1] >= 11))) { - extra_params = "1 allow_discards"; - printf("Enabling support for allow_discards in dmcrypt.\n"); - } - } -#endif - - load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name, - fd, extra_params); - if (load_count < 0) { - printf("Cannot load dm-crypt mapping table.\n"); - - // Remove the dm-crypt device, otherwise it cannot be used later on by other - // processes (eg vold_decrypt) or further testing/debugging in recovery - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_REMOVE, io)) { - printf("Cannot remove dm-crypt device %i\n", errno); - } - goto errout; - } else if (load_count > 1) { - printf("Took %d tries to load dmcrypt table.\n", load_count); - } - - /* Resume this device to activate it */ - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - - if (ioctl(fd, DM_DEV_SUSPEND, io)) { - printf("Cannot resume the dm-crypt device\n"); - - // Remove the dm-crypt device, otherwise it cannot be used later on by other - // processes (eg vold_decrypt) or further testing/debugging in recovery - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_REMOVE, io)) { - printf("Cannot remove dm-crypt device %i\n", errno); - } - goto errout; - } - - /* We made it here with no errors. Woot! */ - retval = 0; - -errout: - close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ - - return retval; -} - -int delete_crypto_blk_dev(char *name) -{ - int fd; - char buffer[DM_CRYPT_BUF_SIZE]; - struct dm_ioctl *io; - int retval = -1; - - if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { - printf("Cannot open device-mapper\n"); - goto errout; - } - - io = (struct dm_ioctl *) buffer; - - ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); - if (ioctl(fd, DM_DEV_REMOVE, io)) { - printf("Cannot remove dm-crypt device\n"); - goto errout; - } - - /* We made it here with no errors. Woot! */ - retval = 0; - -errout: - close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ - - return retval; - -} - -static int pbkdf2(const char *passwd, const unsigned char *salt, - unsigned char *ikey, void *params UNUSED) -{ - printf("Using pbkdf2 for cryptfs KDF\n"); - - /* Turn the password into a key and IV that can decrypt the master key */ - unsigned int keysize; - char* master_key = (char*)convert_hex_ascii_to_key(passwd, &keysize); - if (!master_key) return -1; - PKCS5_PBKDF2_HMAC_SHA1(master_key, keysize, salt, SALT_LEN, - HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); - - memset(master_key, 0, keysize); - free (master_key); - return 0; -} - -static int scrypt(const char *passwd, const unsigned char *salt, - unsigned char *ikey, void *params) -{ - printf("Using scrypt for cryptfs KDF\n"); - - 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 */ - unsigned int keysize; - unsigned char* master_key = convert_hex_ascii_to_key(passwd, &keysize); - if (!master_key) return -1; - crypto_scrypt(master_key, keysize, salt, SALT_LEN, N, r, p, ikey, - KEY_LEN_BYTES + IV_LEN_BYTES); - - memset(master_key, 0, keysize); - free (master_key); - return 0; -} - -static int scrypt_keymaster(const char *passwd, const unsigned char *salt, - unsigned char *ikey, void *params) -{ - printf("Using scrypt with keymaster for cryptfs KDF\n"); - - int rc; - unsigned int key_size; - size_t signature_size; - unsigned char* signature; - 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; - - unsigned char* master_key = convert_hex_ascii_to_key(passwd, &key_size); - if (!master_key) { - printf("Failed to convert passwd from hex, using passwd instead\n"); - master_key = (unsigned char*)strdup(passwd); - } - - rc = crypto_scrypt(master_key, key_size, salt, SALT_LEN, - N, r, p, ikey, KEY_LEN_BYTES + IV_LEN_BYTES); - memset(master_key, 0, key_size); - free(master_key); - - if (rc) { - printf("scrypt failed\n"); - return -1; - } - - if (keymaster_sign_object(ftr, ikey, KEY_LEN_BYTES + IV_LEN_BYTES, - &signature, &signature_size)) { - printf("Signing failed\n"); - return -1; - } - - rc = crypto_scrypt(signature, signature_size, salt, SALT_LEN, - N, r, p, ikey, KEY_LEN_BYTES + IV_LEN_BYTES); - free(signature); - - if (rc) { - printf("scrypt failed\n"); - return -1; - } - - return 0; -} - -static int decrypt_master_key_aux(char *passwd, unsigned char *salt, - unsigned char *encrypted_master_key, - unsigned char *decrypted_master_key, - kdf_func kdf, void *kdf_params, - unsigned char** intermediate_key, - size_t* intermediate_key_size) -{ - 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 an intermediate key and IV that can decrypt the - master key */ - if (kdf(passwd, salt, ikey, kdf_params)) { - printf("kdf failed\n"); - return -1; - } - - /* Initialize the decryption engine */ - if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { - return -1; - } - EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ - /* Decrypt the master key */ - if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, - encrypted_master_key, KEY_LEN_BYTES)) { - return -1; - } -#ifndef TW_CRYPTO_HAVE_KEYMASTERX - if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { -#else - if (! EVP_DecryptFinal_ex(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { -#endif - return -1; - } - - if (decrypted_len + final_len != KEY_LEN_BYTES) { - return -1; - } - - /* Copy intermediate key if needed by params */ - if (intermediate_key && intermediate_key_size) { - *intermediate_key = (unsigned char*) malloc(KEY_LEN_BYTES); - if (intermediate_key) { - memcpy(*intermediate_key, ikey, KEY_LEN_BYTES); - *intermediate_key_size = KEY_LEN_BYTES; - } - } - - return 0; -} - -static void get_kdf_func(struct crypt_mnt_ftr *ftr, kdf_func *kdf, void** kdf_params) -{ - if (ftr->kdf_type == KDF_SCRYPT_KEYMASTER_UNPADDED || - ftr->kdf_type == KDF_SCRYPT_KEYMASTER_BADLY_PADDED || - ftr->kdf_type == KDF_SCRYPT_KEYMASTER) { - *kdf = scrypt_keymaster; - *kdf_params = ftr; - } else if (ftr->kdf_type == KDF_SCRYPT) { - *kdf = scrypt; - *kdf_params = ftr; - } else { - *kdf = pbkdf2; - *kdf_params = NULL; - } -} - -static int decrypt_master_key(char *passwd, unsigned char *decrypted_master_key, - struct crypt_mnt_ftr *crypt_ftr, - unsigned char** intermediate_key, - size_t* intermediate_key_size) -{ - kdf_func kdf; - void *kdf_params; - int ret; - - get_kdf_func(crypt_ftr, &kdf, &kdf_params); - ret = decrypt_master_key_aux(passwd, crypt_ftr->salt, crypt_ftr->master_key, - decrypted_master_key, kdf, kdf_params, - intermediate_key, intermediate_key_size); - if (ret != 0) { - printf("failure decrypting master key\n"); - } - - return ret; -} - -static int try_mount_multiple_fs(const char *crypto_blkdev, - const char *mount_point, - const char *file_system) -{ - if (!mount(crypto_blkdev, mount_point, file_system, 0, NULL)) - return 0; - if (strcmp(file_system, "ext4") && - !mount(crypto_blkdev, mount_point, "ext4", 0, NULL)) - return 0; - if (strcmp(file_system, "f2fs") && - !mount(crypto_blkdev, mount_point, "f2fs", 0, NULL)) - return 0; - return 1; -} - -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 tmp_mount_point[64]; - int rc = 0; - unsigned char* intermediate_key = 0; - size_t intermediate_key_size = 0; - - printf("crypt_ftr->fs_size = %lld\n", crypt_ftr->fs_size); - - if (! (crypt_ftr->flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { - if (decrypt_master_key(passwd, decrypted_master_key, crypt_ftr, - &intermediate_key, &intermediate_key_size)) { - printf("Failed to decrypt master key\n"); - rc = -1; - goto errout; - } - } - -#ifdef CONFIG_HW_DISK_ENCRYPTION - int key_index = 0; - if(is_hw_disk_encryption((char*)crypt_ftr->crypto_type_name)) { - key_index = verify_hw_fde_passwd(passwd, crypt_ftr); - - if (key_index < 0) { - rc = 1; - goto errout; - } - else { - if (is_ice_enabled()) { - if (create_crypto_blk_dev(crypt_ftr, (unsigned char*)&key_index, - real_blkdev, crypto_blkdev, label)) { - printf("Error creating decrypted block device"); - rc = -1; - goto errout; - } - } else { - if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key, - real_blkdev, crypto_blkdev, label)) { - printf("Error creating decrypted block device"); - rc = -1; - goto errout; - } - } - } - } else { - /* in case HW FDE is delivered through OTA and device is already encrypted - * using SW FDE, we should let user continue using SW FDE until userdata is - * wiped. - */ - if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key, - real_blkdev, crypto_blkdev, label)) { - printf("Error creating decrypted block device"); - rc = -1; - goto errout; - } - } -#else - // Create crypto block device - all (non fatal) code paths - // need it - if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key, - real_blkdev, crypto_blkdev, label)) { - printf("Error creating decrypted block device\n"); - rc = -1; - goto errout; - } -#endif - - /* Work out if the problem is the password or the data */ - unsigned char scrypted_intermediate_key[sizeof(crypt_ftr-> - scrypted_intermediate_key)]; - int N = 1 << crypt_ftr->N_factor; - int r = 1 << crypt_ftr->r_factor; - int p = 1 << crypt_ftr->p_factor; - - rc = crypto_scrypt(intermediate_key, intermediate_key_size, - crypt_ftr->salt, sizeof(crypt_ftr->salt), - N, r, p, scrypted_intermediate_key, - sizeof(scrypted_intermediate_key)); - - // Does the key match the crypto footer? - if (rc == 0 && memcmp(scrypted_intermediate_key, - crypt_ftr->scrypted_intermediate_key, - sizeof(scrypted_intermediate_key)) == 0) { - printf("Password matches\n"); - rc = 0; - } else { - /* Try mounting the file system anyway, just in case the problem's with - * the footer, not the key. */ - sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); - mkdir(tmp_mount_point, 0755); - if (try_mount_multiple_fs(crypto_blkdev, tmp_mount_point, file_system)) { - printf("Error temp mounting decrypted block device '%s'\n", crypto_blkdev); - delete_crypto_blk_dev(label); - rc = 1; - } else { - /* Success! */ - printf("Password did not match but decrypted drive mounted - continue\n"); - umount(tmp_mount_point); - rc = 0; - } - } - - if (rc == 0) { - // Don't increment the failed attempt counter as it doesn't - // make sense to do so in TWRP - - /* Save the name of the crypto block device - * so we can mount it when restarting the framework. */ - property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); - - // TWRP shouldn't change the stored key - } - - errout: - if (intermediate_key) { - memset(intermediate_key, 0, intermediate_key_size); - free(intermediate_key); - } - return rc; -} - -int check_unmounted_and_get_ftr(struct crypt_mnt_ftr* crypt_ftr) -{ - char encrypted_state[PROPERTY_VALUE_MAX]; - property_get("ro.crypto.state", encrypted_state, ""); - if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { - printf("encrypted fs already validated or not running with encryption," - " aborting\n"); - //return -1; - } - - if (get_crypt_ftr_and_key(crypt_ftr)) { - printf("Error getting crypt footer and key\n"); - return -1; - } - - return 0; -} - -int cryptfs_check_footer() -{ - int rc = -1; - struct crypt_mnt_ftr crypt_ftr; - - rc = get_crypt_ftr_and_key(&crypt_ftr); - - return rc; -} - -int cryptfs_check_passwd(char *passwd) -{ - struct crypt_mnt_ftr crypt_ftr; - int rc; - - if (!passwd) { - printf("cryptfs_check_passwd: passwd is NULL!\n"); - return -1; - } - - rc = check_unmounted_and_get_ftr(&crypt_ftr); - if (rc) - return rc; - - rc = test_mount_encrypted_fs(&crypt_ftr, passwd, - DATA_MNT_POINT, "userdata"); - - // try falling back to Lollipop hex passwords - if (rc) { - int hex_pass_len = strlen(passwd) * 2 + 1; - char *hex_passwd = (char *)malloc(hex_pass_len); - if (hex_passwd) { - convert_key_to_hex_ascii((unsigned char *)passwd, - strlen(passwd), hex_passwd); - rc = test_mount_encrypted_fs(&crypt_ftr, hex_passwd, - DATA_MNT_POINT, "userdata"); - memset(hex_passwd, 0, hex_pass_len); - free(hex_passwd); - } - } - - return rc; -} - -/* Returns type of the password, default, pattern, pin or password. - */ -int cryptfs_get_password_type(void) -{ - struct crypt_mnt_ftr crypt_ftr; - - if (get_crypt_ftr_and_key(&crypt_ftr)) { - printf("Error getting crypt footer and key\n"); - return -1; - } - - if (crypt_ftr.flags & CRYPT_INCONSISTENT_STATE) { - return -1; - } - - return crypt_ftr.crypt_type; -} - -/* - * Called by vold when it's asked to mount an encrypted external - * storage volume. The incoming partition has no crypto header/footer, - * as any metadata is been stored in a separate, small partition. - * - * out_crypto_blkdev must be MAXPATHLEN. - */ -int cryptfs_setup_ext_volume(const char* label, const char* real_blkdev, - const unsigned char* key, int keysize, char* out_crypto_blkdev) { - int fd = open(real_blkdev, O_RDONLY|O_CLOEXEC); - if (fd == -1) { - printf("Failed to open %s: %s", real_blkdev, strerror(errno)); - return -1; - } - - unsigned long nr_sec = 0; - nr_sec = get_blkdev_size(fd); - close(fd); - - if (nr_sec == 0) { - printf("Failed to get size of %s: %s", real_blkdev, strerror(errno)); - return -1; - } - - struct crypt_mnt_ftr ext_crypt_ftr; - memset(&ext_crypt_ftr, 0, sizeof(ext_crypt_ftr)); - ext_crypt_ftr.fs_size = nr_sec; - ext_crypt_ftr.keysize = keysize; - strcpy((char*) ext_crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); - - return create_crypto_blk_dev(&ext_crypt_ftr, key, real_blkdev, - out_crypto_blkdev, label); -} - -/* - * Called by vold when it's asked to unmount an encrypted external - * storage volume. - */ -int cryptfs_revert_ext_volume(const char* label) { - return delete_crypto_blk_dev((char*) label); -} |