From 1c8464e1365950538e9e4647a4f220910f79ab1e Mon Sep 17 00:00:00 2001
From: rpcraig <rpcraig@tycho.ncsc.mil>
Date: Tue, 4 Dec 2012 08:13:58 -0500
Subject: [PATCH] App data backup security policy.
Policy covers:
* backup_data_file type for labeling all
files/dirs under /data dealing with
backup mechanism.
* cache_backup_file type for labeling all
files/dirs under /cache dealing with
backup mechanism. This also covers the
the use of LocalTransport for local archive
and restore testing.
* the use of 'adb shell bmgr' to initiate
backup mechanism from shell.
* the use of 'adb backup/restore' to archive
and restore the device's data.
Change-Id: I700a92d8addb9bb91474bc07ca4bb71eb4fc840e
Signed-off-by: rpcraig <rpcraig@tycho.ncsc.mil>
---
app.te | 7 +++++++
file.te | 5 +++++
file_contexts | 6 ++++++
system.te | 13 +++++++++++--
4 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/app.te b/app.te
index b3cd7ccfb..7cd8c5a2b 100644
--- a/app.te
+++ b/app.te
@@ -201,3 +201,10 @@ r_dir_file(appdomain, isolated_app)
# are examined.
allow appdomain isolated_app:unix_stream_socket { read write };
allow isolated_app appdomain:unix_stream_socket { read write };
+
+# Backup ability for every app. BMS opens and passes the fd
+# to any app that has backup ability. Hence, no open permissions here.
+allow { appdomain isolated_app } backup_data_file:file { read write };
+allow { appdomain isolated_app } cache_backup_file:file { read write };
+# Backup ability using 'adb backup'
+allow { appdomain isolated_app } system_data_file:lnk_file getattr;
diff --git a/file.te b/file.te
index 64c8de6b2..4dbf1c895 100644
--- a/file.te
+++ b/file.te
@@ -55,6 +55,9 @@ type app_data_file, file_type, data_file_type;
type platform_app_data_file, file_type, data_file_type, mlstrustedobject;
# Default type for anything under /cache
type cache_file, file_type, mlstrustedobject;
+# Type for /cache/.*\.{data|restore} and default
+# type for anything under /cache/backup
+type cache_backup_file, file_type, mlstrustedobject;
# Default type for anything under /efs
type efs_file, file_type;
# Type for wallpaper file.
@@ -63,6 +66,8 @@ type wallpaper_file, file_type, mlstrustedobject;
type asec_apk_file, file_type, data_file_type;
# /data/app-asec
type asec_image_file, file_type, data_file_type;
+# /data/backup and /data/secure/backup
+type backup_data_file, file_type, data_file_type, mlstrustedobject;
# All devices have bluetooth efs files. But they
# vary per device, so this type is used in per
diff --git a/file_contexts b/file_contexts
index 837ee1daa..b2d253ab9 100644
--- a/file_contexts
+++ b/file_contexts
@@ -140,6 +140,8 @@
# Data files
#
/data(/.*)? u:object_r:system_data_file:s0
+/data/backup(/.*)? u:object_r:backup_data_file:s0
+/data/secure/backup(/.*)? u:object_r:backup_data_file:s0
/data/drm(/.*)? u:object_r:drm_data_file:s0
/data/gps(/.*)? u:object_r:gps_data_file:s0
/data/dalvik-cache(/.*)? u:object_r:dalvikcache_data_file:s0
@@ -170,6 +172,10 @@
# Cache files
#
/cache(/.*)? u:object_r:cache_file:s0
+/cache/.*\.data u:object_r:cache_backup_file:s0
+/cache/.*\.restore u:object_r:cache_backup_file:s0
+# LocalTransport (backup) uses this directory
+/cache/backup(/.*)? u:object_r:cache_backup_file:s0
#############################
# sysfs files
#
diff --git a/system.te b/system.te
index 85b43470d..3ede14a2c 100644
--- a/system.te
+++ b/system.te
@@ -189,8 +189,8 @@ type_transition system wifi_data_file:sock_file system_wpa_socket;
allow system system_wpa_socket:sock_file create_file_perms;
# Manage cache files.
-allow system cache_file:dir create_dir_perms;
-allow system cache_file:file create_file_perms;
+allow system cache_file:dir { relabelfrom create_dir_perms };
+allow system cache_file:file { relabelfrom create_file_perms };
# Run system programs, e.g. dexopt.
allow system system_file:file x_file_perms;
@@ -212,3 +212,12 @@ allow system rild:unix_stream_socket connectto;
# connect to vpn tunnel
allow system mtp:unix_stream_socket { connectto };
+
+# BackupManagerService lets PMS create a data backup file
+allow system cache_backup_file:file create_file_perms;
+# Relabel /data/backup
+allow system backup_data_file:dir { relabelto relabelfrom };
+# Relabel /cache/.*\.{data|restore}
+allow system cache_backup_file:file { relabelto relabelfrom };
+# LocalTransport creates and relabels /cache/backup
+allow system cache_backup_file:dir { relabelto relabelfrom create_dir_perms };
--
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