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:file r_file_perms;
36# Execute libs in asec containers.
37allow untrusted_app asec_public_file:file { execute execmod };
38
39# Allow the allocation and use of ptys
40# Used by: https://play.google.com/store/apps/details?id=jackpal.androidterm
41create_pty(untrusted_app)
42
43# Used by Finsky / Android "Verify Apps" functionality when
44# running "adb install foo.apk".
45# TODO: Long term, we don't want apps probing into shell data files.
46# Figure out a way to remove these rules.
47allow untrusted_app shell_data_file:file r_file_perms;
48allow untrusted_app shell_data_file:dir r_dir_perms;
49
50# b/18504118: Allow reads from /data/anr/traces.txt
51# TODO: We shouldn't be allowing all untrusted_apps to read
52# this file. This is only needed for the GMS feedback agent.
53# See also b/18340553. GMS runs as untrusted_app, and
54# it's too late to change the domain it runs in.
55# This line needs to be deleted.
56allow untrusted_app anr_data_file:file r_file_perms;
57
58#
59# Rules migrated from old app domains coalesced into untrusted_app.
60# This includes what used to be media_app, shared_app, and release_app.
61#
62
63# Access /dev/mtp_usb.
64allow untrusted_app mtp_device:chr_file rw_file_perms;
65
66# Access to /data/media.
67allow untrusted_app media_rw_data_file:dir create_dir_perms;
68allow untrusted_app media_rw_data_file:file create_file_perms;
69
70# Write to /cache.
71allow untrusted_app cache_file:dir create_dir_perms;
72allow untrusted_app cache_file:file create_file_perms;
73
74###
75### neverallow rules
76###
77
78# Receive or send uevent messages.
79neverallow untrusted_app domain:netlink_kobject_uevent_socket *;
80
81# Receive or send generic netlink messages
82neverallow untrusted_app domain:netlink_socket *;
83
84# Too much leaky information in debugfs. It's a security
85# best practice to ensure these files aren't readable.
86neverallow untrusted_app debugfs:file read;
87
88# Do not allow untrusted apps to register services.
89# Only trusted components of Android should be registering
90# services.
91neverallow untrusted_app service_manager_type:service_manager add;
92
93# Do not allow untrusted_apps to connect to the property service
94# or set properties. b/10243159
95neverallow untrusted_app property_socket:sock_file write;
96neverallow untrusted_app init:unix_stream_socket connectto;
97neverallow untrusted_app property_type:property_service set;
98
99# Allow verifier to access staged apks.
100allow untrusted_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
101allow untrusted_app { apk_tmp_file apk_private_tmp_file }:file r_file_perms;
102