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-rw-r--r--Android.mk3
-rw-r--r--efs_migration.c183
-rw-r--r--efs_migration.h40
-rw-r--r--recovery.c44
4 files changed, 268 insertions, 2 deletions
diff --git a/Android.mk b/Android.mk
index 84421e717..c556db36b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -12,7 +12,8 @@ LOCAL_SRC_FILES := \
install.c \
roots.c \
ui.c \
- verifier.c
+ verifier.c \
+ efs_migration.c
LOCAL_SRC_FILES += test_roots.c
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 087258fe8..4c437e599 100644
--- a/recovery.c
+++ b/recovery.c
@@ -36,12 +36,15 @@
#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, egnor to review.
+ { "set_encrypted_filesystem", required_argument, NULL, 'e' },
{ NULL, 0, NULL, 0 },
};
@@ -468,7 +471,10 @@ 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) {
@@ -478,6 +484,7 @@ 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;
@@ -497,7 +504,42 @@ 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) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-14 21:09:36 +0200