diff options
Diffstat (limited to 'cryptfs_hw.c')
| -rw-r--r-- | cryptfs_hw.c | 124 |
1 files changed, 110 insertions, 14 deletions
diff --git a/cryptfs_hw.c b/cryptfs_hw.c index a5d76ef..36d5d48 100644 --- a/cryptfs_hw.c +++ b/cryptfs_hw.c @@ -45,6 +45,10 @@ #include "cutils/android_reboot.h" #include "cryptfs_hw.h" +#ifdef LEGACY_HW_DISK_ENCRYPTION +#define QSEECOM_LIBRARY_NAME "libQSEEComAPI.so" +#endif + /* * When device comes up or when user tries to change the password, user can * try wrong password upto a certain number of times. If user enters wrong @@ -59,6 +63,13 @@ #define SET_HW_DISK_ENC_KEY 1 #define UPDATE_HW_DISK_ENC_KEY 2 +#ifdef LEGACY_HW_DISK_ENCRYPTION +static int loaded_library = 0; +static int (*qseecom_create_key)(int, void*); +static int (*qseecom_update_key)(int, void*, void*); +static int (*qseecom_wipe_key)(int); +#endif + #define CRYPTFS_HW_KMS_CLEAR_KEY 0 #define CRYPTFS_HW_KMS_WIPE_KEY 1 #define CRYPTFS_HW_UP_CHECK_COUNT 10 @@ -85,6 +96,89 @@ static inline void* secure_memset(void* v, int c , size_t n) return v; } +#ifdef LEGACY_HW_DISK_ENCRYPTION +static int is_qseecom_up() +{ + int i = 0; + char value[PROPERTY_VALUE_MAX] = {0}; + + for (; i<CRYPTFS_HW_UP_CHECK_COUNT; i++) { + property_get("sys.keymaster.loaded", value, ""); + if (!strncmp(value, "true", PROPERTY_VALUE_MAX)) + return 1; + usleep(100000); + } + return 0; +} + +static int load_qseecom_library() +{ + const char *error = NULL; + if (loaded_library) + return loaded_library; + + if (!is_qseecom_up()) { + SLOGE("Timed out waiting for QSEECom listeners. Aborting FDE key operation"); + return 0; + } + + void * handle = dlopen(QSEECOM_LIBRARY_NAME, RTLD_NOW); + if (handle) { + dlerror(); /* Clear any existing error */ + *(void **) (&qseecom_create_key) = dlsym(handle, "QSEECom_create_key"); + + if ((error = dlerror()) == NULL) { + SLOGD("Success loading QSEECom_create_key \n"); + *(void **) (&qseecom_update_key) = dlsym(handle, "QSEECom_update_key_user_info"); + if ((error = dlerror()) == NULL) { + SLOGD("Success loading QSEECom_update_key_user_info\n"); + *(void **) (&qseecom_wipe_key) = dlsym(handle, "QSEECom_wipe_key"); + if ((error = dlerror()) == NULL) { + loaded_library = 1; + SLOGD("Success loading QSEECom_wipe_key \n"); + } + else + SLOGE("Error %s loading symbols for QSEECom APIs \n", error); + } + else + SLOGE("Error %s loading symbols for QSEECom APIs \n", error); + } + } else { + SLOGE("Could not load libQSEEComAPI.so \n"); + } + + if (error) + dlclose(handle); + + return loaded_library; +} + +static int cryptfs_hw_create_key(enum cryptfs_hw_key_management_usage_type usage, + unsigned char *hash32) +{ + if (load_qseecom_library()) + return qseecom_create_key(usage, hash32); + + return CRYPTFS_HW_CREATE_KEY_FAILED; +} + +static int cryptfs_hw_wipe_key(enum cryptfs_hw_key_management_usage_type usage) +{ + if (load_qseecom_library()) + return qseecom_wipe_key(usage); + + return CRYPTFS_HW_WIPE_KEY_FAILED; +} + +static int cryptfs_hw_update_key(enum cryptfs_hw_key_management_usage_type usage, + unsigned char *current_hash32, unsigned char *new_hash32) +{ + if (load_qseecom_library()) + return qseecom_update_key(usage, current_hash32, new_hash32); + + return CRYPTFS_HW_UPDATE_KEY_FAILED; +} +#else static size_t memscpy(void *dst, size_t dst_size, const void *src, size_t src_size) { size_t min_size = (dst_size < src_size) ? dst_size : src_size; @@ -258,6 +352,7 @@ static int cryptfs_hw_update_key(enum cryptfs_hw_key_management_usage_type usage close(qseecom_fd); return ret; } +#endif static int map_usage(int usage) { @@ -292,20 +387,6 @@ static unsigned char* get_tmp_passwd(const char* passwd) return tmp_passwd; } -static int is_qseecom_up() -{ - int i = 0; - char value[PROPERTY_VALUE_MAX] = {0}; - - for (; i<CRYPTFS_HW_UP_CHECK_COUNT; i++) { - property_get("vendor.sys.keymaster.loaded", value, ""); - if (!strncmp(value, "true", PROPERTY_VALUE_MAX)) - return 1; - usleep(100000); - } - return 0; -} - /* * For NON-ICE targets, it would return 0 on success. On ICE based targets, * it would return key index in the ICE Key LUT @@ -383,6 +464,7 @@ int clear_hw_device_encryption_key() return cryptfs_hw_wipe_key(map_usage(CRYPTFS_HW_KM_USAGE_DISK_ENCRYPTION)); } +#ifdef LEGACY_HW_DISK_ENCRYPTION static int get_keymaster_version() { int rc = -1; @@ -395,11 +477,25 @@ static int get_keymaster_version() return mod->module_api_version; } +#endif int should_use_keymaster() { +#ifdef LEGACY_HW_DISK_ENCRYPTION + /* + * HW FDE key should be tied to keymaster only if + * new Keymaster is available + */ + int rc = 0; + if (get_keymaster_version() != KEYMASTER_MODULE_API_VERSION_1_0) { + SLOGI("Keymaster version is not 1.0"); + return rc; + } +#else /* * HW FDE key should be tied to keymaster */ +#endif + return 1; } |