untrusted_app.te revision 642b80427ec2e95eb13cf03a74d814f240813e71 
1###
2### Untrusted apps.
3###
4### This file defines the rules for untrusted apps.
5### Apps are labeled based on mac_permissions.xml (maps signer and
6### optionally package name to seinfo value) and seapp_contexts (maps UID
7### and optionally seinfo value to domain for process and type for data
8### directory).  The untrusted_app domain is the default assignment in
9### seapp_contexts for any app with UID between APP_AID (10000)
10### and AID_ISOLATED_START (99000) if the app has no specific seinfo
11### value as determined from mac_permissions.xml.  In current AOSP, this
12### domain is assigned to all non-system apps as well as to any system apps
13### that are not signed by the platform key.  To move
14### a system app into a specific domain, add a signer entry for it to
15### mac_permissions.xml and assign it one of the pre-existing seinfo values
16### or define and use a new seinfo value in both mac_permissions.xml and
17### seapp_contexts.
18###
19### untrusted_app includes all the appdomain rules, plus the
20### additional following rules:
21###
22
23type untrusted_app, domain;
24app_domain(untrusted_app)
25net_domain(untrusted_app)
26bluetooth_domain(untrusted_app)
27
28# Some apps ship with shared libraries and binaries that they write out
29# to their sandbox directory and then execute.
30allow untrusted_app app_data_file:file { rx_file_perms execmod };
31
32allow untrusted_app tun_device:chr_file rw_file_perms;
33
34# ASEC
35allow untrusted_app asec_apk_file:dir { getattr };
36allow untrusted_app asec_apk_file:file r_file_perms;
37# Execute libs in asec containers.
38allow untrusted_app asec_public_file:file { execute execmod };
39
40# Allow the allocation and use of ptys
41# Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm
42create_pty(untrusted_app)
43
44# Used by Finsky / Android "Verify Apps" functionality when
45# running "adb install foo.apk".
46# TODO: Long term, we don't want apps probing into shell data files.
47# Figure out a way to remove these rules.
48allow untrusted_app shell_data_file:file r_file_perms;
49allow untrusted_app shell_data_file:dir r_dir_perms;
50
51#
52# Rules migrated from old app domains coalesced into untrusted_app.
53# This includes what used to be media_app, shared_app, and release_app.
54#
55
56# Access /dev/mtp_usb.
57allow untrusted_app mtp_device:chr_file rw_file_perms;
58
59# Access to /data/media.
60allow untrusted_app media_rw_data_file:dir create_dir_perms;
61allow untrusted_app media_rw_data_file:file create_file_perms;
62
63# Write to /cache.
64allow untrusted_app cache_file:dir create_dir_perms;
65allow untrusted_app cache_file:file create_file_perms;
66
67# Audited locally.
68service_manager_local_audit_domain(untrusted_app)
69auditallow untrusted_app {
70    service_manager_type
71    -drmserver_service
72    -keystore_service
73    -mediaserver_service
74    -nfc_service
75    -radio_service
76    -surfaceflinger_service
77    -system_server_service
78}:service_manager find;
79
80###
81### neverallow rules
82###
83
84# Receive or send uevent messages.
85neverallow untrusted_app self:netlink_kobject_uevent_socket *;
86
87# Too much leaky information in debugfs. It's a security
88# best practice to ensure these files aren't readable.
89neverallow untrusted_app debugfs:file read;
90
91# Do not allow untrusted apps to register services.
92# Only trusted components of Android should be registering
93# services.
94neverallow untrusted_app service_manager_type:service_manager add;
95
96# Do not allow untrusted_apps to connect to the property service
97# or set properties. b/10243159
98neverallow untrusted_app property_socket:sock_file write;
99neverallow untrusted_app init:unix_stream_socket connectto;
100neverallow untrusted_app property_type:property_service set;
101
102# Allow verifier to access staged apks.
103allow untrusted_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
104allow untrusted_app { apk_tmp_file apk_private_tmp_file }:file r_file_perms;