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###
68### neverallow rules
69###
70
71# Receive or send uevent messages.
72neverallow untrusted_app self:netlink_kobject_uevent_socket *;
73
74# Too much leaky information in debugfs. It's a security
75# best practice to ensure these files aren't readable.
76neverallow untrusted_app debugfs:file read;
77
78# Do not allow untrusted apps to register services.
79# Only trusted components of Android should be registering
80# services.
81neverallow untrusted_app service_manager_type:service_manager add;
82
83# Do not allow untrusted_apps to connect to the property service
84# or set properties. b/10243159
85neverallow untrusted_app property_socket:sock_file write;
86neverallow untrusted_app init:unix_stream_socket connectto;
87neverallow untrusted_app property_type:property_service set;
88
89# Allow verifier to access staged apks.
90allow untrusted_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
91allow untrusted_app { apk_tmp_file apk_private_tmp_file }:file r_file_perms;
92