PWN-Hunter/android_system_sepolicy
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App data backup security policy.

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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>
This commit is contained in:
rpcraig 2012-12-04 08:13:58 -05:00 committed by Gerrit Code Review
parent c57dbccb50
commit 1c8464e136
4 changed files with 29 additions and 2 deletions
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7
app.te
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@ -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;

5
file.te
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@ -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

6
file_contexts
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@ -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
#

13
system.te
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@ -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 };