diff options
| -rw-r--r-- | Android.mk | 17 | ||||
| -rw-r--r-- | efs_migration.c | 183 | ||||
| -rw-r--r-- | efs_migration.h | 40 | ||||
| -rw-r--r-- | recovery.c | 85 |
4 files changed, 303 insertions, 22 deletions
diff --git a/Android.mk b/Android.mk index deec80ae4..913aa1491 100644 --- a/Android.mk +++ b/Android.mk @@ -7,13 +7,14 @@ include $(CLEAR_VARS) commands_recovery_local_path := $(LOCAL_PATH) LOCAL_SRC_FILES := \ - recovery.c \ - bootloader.c \ - firmware.c \ - install.c \ - roots.c \ - ui.c \ - verifier.c + recovery.c \ + bootloader.c \ + firmware.c \ + install.c \ + roots.c \ + ui.c \ + verifier.c \ + efs_migration.c LOCAL_SRC_FILES += test_roots.c @@ -52,5 +53,5 @@ include $(commands_recovery_local_path)/updater/Android.mk commands_recovery_local_path := endif # TARGET_ARCH == arm -endif # !TARGET_SIMULATOR +endif # !TARGET_SIMULATOR diff --git a/efs_migration.c b/efs_migration.c new file mode 100644 index 000000000..aeadd1865 --- /dev/null +++ b/efs_migration.c @@ -0,0 +1,183 @@ +/* + * Copyright (C) 2009 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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mount.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#include "efs_migration.h" +#include "cutils/misc.h" +#include "cutils/properties.h" +#include "common.h" +#include "mtdutils/mtdutils.h" +#include "mtdutils/mounts.h" +#include "roots.h" + +const char* efs_enabled_property = "persist.security.efs.enabled"; +const char* efs_transition_property = "persist.security.efs.trans"; +const char* efs_property_dir = "/data/property/"; + +void get_property_file_name(char *buffer, const char *property_name) { + sprintf(buffer, "%s%s", efs_property_dir, property_name); +} + +int get_text_file_contents(char *buffer, int buf_size, char *file_name) { + FILE *in_file; + char *read_data; + + in_file = fopen(file_name, "r"); + if (in_file == NULL) { + LOGE("Encrypted FS: error accessing properties."); + return EFS_ERROR; + } + + read_data = fgets(buffer, buf_size, in_file); + if (read_data == NULL) { + // Error or unexpected data + fclose(in_file); + LOGE("Encrypted FS: error accessing properties."); + return EFS_ERROR; + } + + fclose(in_file); + return EFS_OK; +} + +int set_text_file_contents(char *buffer, char *file_name) { + FILE *out_file; + int result; + + out_file = fopen(file_name, "w"); + if (out_file == NULL) { + LOGE("Encrypted FS: error setting up properties."); + return EFS_ERROR; + } + + result = fputs(buffer, out_file); + if (result != 0) { + // Error or unexpected data + fclose(out_file); + LOGE("Encrypted FS: error setting up properties."); + return EFS_ERROR; + } + + fflush(out_file); + fclose(out_file); + return EFS_OK; +} + + +int read_efs_boolean_property(const char *prop_name, int *value) { + char prop_file_name[PROPERTY_KEY_MAX + 32]; + char prop_value[PROPERTY_VALUE_MAX]; + int result; + + get_property_file_name(prop_file_name, prop_name); + result = get_text_file_contents(prop_value, PROPERTY_VALUE_MAX, prop_file_name); + + if (result < 0) { + return result; + } + + if (strncmp(prop_value, "1", 1) == 0) { + *value = 1; + } else if (strncmp(prop_value, "0", 1) == 0) { + *value = 0; + } else { + LOGE("Encrypted FS: error accessing properties."); + return EFS_ERROR; + } + + return EFS_OK; +} + +int write_efs_boolean_property(const char *prop_name, int value) { + char prop_file_name[PROPERTY_KEY_MAX + 32]; + char prop_value[PROPERTY_VALUE_MAX]; + int result; + + get_property_file_name(prop_file_name, prop_name); + + // Create the directory if needed + mkdir(efs_property_dir, 0755); + if (value == 1) { + result = set_text_file_contents("1", prop_file_name); + } else if (value == 0) { + result = set_text_file_contents("0", prop_file_name); + } else { + return EFS_ERROR; + } + if (result < 0) { + return result; + } + + return EFS_OK; +} + +int read_encrypted_fs_info(encrypted_fs_info *efs_data) { + int result; + int value; + result = ensure_root_path_mounted("DATA:"); + if (result != 0) { + LOGE("Encrypted FS: error mounting userdata partition."); + return EFS_ERROR; + } + + // STOPSHIP: Read the EFS key from a file (TBD later) + // Future code goes here... + + result = ensure_root_path_unmounted("DATA:"); + if (result != 0) { + LOGE("Encrypted FS: error unmounting data partition."); + return EFS_ERROR; + } + + return EFS_OK; +} + +int restore_encrypted_fs_info(encrypted_fs_info *efs_data) { + int result; + result = ensure_root_path_mounted("DATA:"); + if (result != 0) { + LOGE("Encrypted FS: error mounting userdata partition."); + return EFS_ERROR; + } + + // Set the EFS properties to their respective values + result = write_efs_boolean_property(efs_enabled_property, efs_data->encrypted_fs_mode); + if (result != 0) { + return result; + } + + // Signal "transition" of Encrypted File System settings + result = write_efs_boolean_property(efs_transition_property, 1); + if (result != 0) { + return result; + } + + result = ensure_root_path_unmounted("DATA:"); + if (result != 0) { + LOGE("Encrypted FS: error unmounting data partition."); + return EFS_ERROR; + } + + return EFS_OK; +} + diff --git a/efs_migration.h b/efs_migration.h new file mode 100644 index 000000000..7857f94fe --- /dev/null +++ b/efs_migration.h @@ -0,0 +1,40 @@ +/* + * Copyright (C) 2009 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 <stdio.h> + +#ifndef __EFS_MIGRATION_H__ +#define __EFS_MIGRATION_H__ + +#define MODE_ENCRYPTEDFS_DISABLED 0 +#define MODE_ENCRYPTEDFS_ENABLED 1 + +#define EFS_OK 0 +#define EFS_ERROR (-1) + +struct encrypted_fs_info { + int encrypted_fs_mode; + char *encrypted_fs_key; +}; + +typedef struct encrypted_fs_info encrypted_fs_info; + +int read_encrypted_fs_info(encrypted_fs_info *efs_data); + +int restore_encrypted_fs_info(encrypted_fs_info *efs_data); + +#endif /* __EFS_MIGRATION_H__ */ + diff --git a/recovery.c b/recovery.c index 438530710..58c84ef2f 100644 --- a/recovery.c +++ b/recovery.c @@ -37,12 +37,15 @@ #include "minzip/DirUtil.h" #include "roots.h" #include "recovery_ui.h" +#include "efs_migration.h" static const struct option OPTIONS[] = { { "send_intent", required_argument, NULL, 's' }, { "update_package", required_argument, NULL, 'u' }, { "wipe_data", no_argument, NULL, 'w' }, { "wipe_cache", no_argument, NULL, 'c' }, + // TODO{oam}: implement improved command line passing key, egnot to review. + { "set_encrypted_filesystem", required_argument, NULL, 'e' }, { NULL, 0, NULL, 0 }, }; @@ -63,6 +66,7 @@ static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log"; * --update_package=root:path - verify install an OTA package file * --wipe_data - erase user data (and cache), then reboot * --wipe_cache - wipe cache (but not user data), then reboot + * --set_encrypted_filesystem=on|off - enables / diasables encrypted fs * * After completing, we remove /cache/recovery/command and reboot. * Arguments may also be supplied in the bootloader control block (BCB). @@ -107,6 +111,26 @@ static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log"; * 8g. finish_recovery() erases BCB * -- after this, rebooting will (try to) restart the main system -- * 9. main() calls reboot() to boot main system + * + * ENCRYPTED FILE SYSTEMS ENABLE/DISABLE + * 1. user selects "enable encrypted file systems" + * 2. main system writes "--set_encrypted_filesystem=on|off" to + * /cache/recovery/command + * 3. main system reboots into recovery + * 4. get_args() writes BCB with "boot-recovery" and + * "--set_encrypted_filesystems=on|off" + * -- after this, rebooting will restart the transition -- + * 5. read_encrypted_fs_info() retrieves encrypted file systems settings from /data + * Settings include: property to specify the Encrypted FS istatus and + * FS encryption key if enabled (not yet implemented) + * 6. erase_root() reformats /data + * 7. erase_root() reformats /cache + * 8. restore_encrypted_fs_info() writes required encrypted file systems settings to /data + * Settings include: property to specify the Encrypted FS status and + * FS encryption key if enabled (not yet implemented) + * 9. finish_recovery() erases BCB + * -- after this, rebooting will restart the main system -- + * 10. main() calls reboot() to boot main system */ static const int MAX_ARG_LENGTH = 4096; @@ -209,8 +233,7 @@ get_args(int *argc, char ***argv) { } static void -set_sdcard_update_bootloader_message() -{ +set_sdcard_update_bootloader_message() { struct bootloader_message boot; memset(&boot, 0, sizeof(boot)); strlcpy(boot.command, "boot-recovery", sizeof(boot.command)); @@ -223,8 +246,7 @@ set_sdcard_update_bootloader_message() // record any intent we were asked to communicate back to the system. // this function is idempotent: call it as many times as you like. static void -finish_recovery(const char *send_intent) -{ +finish_recovery(const char *send_intent) { // By this point, we're ready to return to the main system... if (send_intent != NULL) { FILE *fp = fopen_root_path(INTENT_FILE, "w"); @@ -255,7 +277,7 @@ finish_recovery(const char *send_intent) check_and_fclose(log, LOG_FILE); } - // Reset the bootloader message to revert to a normal main system boot. + // Reset to mormal system boot so recovery won't cycle indefinitely. struct bootloader_message boot; memset(&boot, 0, sizeof(boot)); set_bootloader_message(&boot); @@ -272,8 +294,7 @@ finish_recovery(const char *send_intent) } static int -erase_root(const char *root) -{ +erase_root(const char *root) { ui_set_background(BACKGROUND_ICON_INSTALLING); ui_show_indeterminate_progress(); ui_print("Formatting %s...\n", root); @@ -384,8 +405,7 @@ wipe_data(int confirm) { } static void -prompt_and_wait() -{ +prompt_and_wait() { char** headers = prepend_title(MENU_HEADERS); for (;;) { @@ -438,14 +458,12 @@ prompt_and_wait() } static void -print_property(const char *key, const char *name, void *cookie) -{ +print_property(const char *key, const char *name, void *cookie) { fprintf(stderr, "%s=%s\n", key, name); } int -main(int argc, char **argv) -{ +main(int argc, char **argv) { time_t start = time(NULL); // If these fail, there's not really anywhere to complain... @@ -459,7 +477,10 @@ main(int argc, char **argv) int previous_runs = 0; const char *send_intent = NULL; const char *update_package = NULL; + const char *efs_mode = NULL; int wipe_data = 0, wipe_cache = 0; + int toggle_efs = 0; + encrypted_fs_info efs_data; int arg; while ((arg = getopt_long(argc, argv, "", OPTIONS, NULL)) != -1) { @@ -469,6 +490,7 @@ main(int argc, char **argv) case 'u': update_package = optarg; break; case 'w': wipe_data = wipe_cache = 1; break; case 'c': wipe_cache = 1; break; + case 'e': efs_mode = optarg; toggle_efs = 1; break; case '?': LOGE("Invalid command argument\n"); continue; @@ -486,7 +508,42 @@ main(int argc, char **argv) int status = INSTALL_SUCCESS; - if (update_package != NULL) { + if (toggle_efs) { + if (strcmp(efs_mode,"on") == 0) { + efs_data.encrypted_fs_mode = MODE_ENCRYPTEDFS_ENABLED; + ui_print("Enabling Encrypted FS.\n"); + } else if (strcmp(efs_mode,"off") == 0) { + efs_data.encrypted_fs_mode = MODE_ENCRYPTEDFS_DISABLED; + ui_print("Disabling Encrypted FS.\n"); + } else { + ui_print("Error: invalid Encrypted FS setting.\n"); + status = INSTALL_ERROR; + } + + // Recovery strategy: if the data partition is damaged, disable encrypted file systems. + // This preventsthe device recycling endlessly in recovery mode. + // TODO{oam}: implement improved recovery strategy later. egnor to review. + if (read_encrypted_fs_info(&efs_data)) { + ui_print("Encrypted FS change aborted, resetting to disabled state.\n"); + efs_data.encrypted_fs_mode = MODE_ENCRYPTEDFS_DISABLED; + } + + if (status != INSTALL_ERROR) { + if (erase_root("DATA:")) { + ui_print("Data wipe failed.\n"); + status = INSTALL_ERROR; + } else if (erase_root("CACHE:")) { + ui_print("Cache wipe failed.\n"); + status = INSTALL_ERROR; + } else if (restore_encrypted_fs_info(&efs_data)) { + ui_print("Encrypted FS change aborted.\n"); + status = INSTALL_ERROR; + } else { + ui_print("Successfully updated Encrypted FS.\n"); + status = INSTALL_SUCCESS; + } + } + } else if (update_package != NULL) { status = install_package(update_package); if (status != INSTALL_SUCCESS) ui_print("Installation aborted.\n"); } else if (wipe_data) { |