1###
2### Services with isolatedProcess=true in their manifest.
3###
4### This file defines the rules for isolated apps. An "isolated
5### app" is an APP with UID between AID_ISOLATED_START (99000)
6### and AID_ISOLATED_END (99999).
7###
8
9typeattribute isolated_app coredomain;
10
11app_domain(isolated_app)
12
13# Access already open app data files received over Binder or local socket IPC.
14allow isolated_app app_data_file:file { append read write getattr lock };
15
16allow isolated_app activity_service:service_manager find;
17allow isolated_app display_service:service_manager find;
18allow isolated_app webviewupdate_service:service_manager find;
19
20# Google Breakpad (crash reporter for Chrome) relies on ptrace
21# functionality. Without the ability to ptrace, the crash reporter
22# tool is broken.
23# b/20150694
24# https://code.google.com/p/chromium/issues/detail?id=475270
25allow isolated_app self:process ptrace;
26
27# b/32896414: Allow accessing sdcard file descriptors passed to isolated_apps
28# by other processes. Open should never be allowed, and is blocked by
29# neverallow rules below.
30# TODO: consider removing write/append. We want to limit isolated_apps
31# ability to mutate files of any type.
32# media_rw_data_file is included for sdcardfs, and can be removed if sdcardfs
33# is modified to change the secontext when accessing the lower filesystem.
34allow isolated_app { sdcard_type media_rw_data_file }:file { read write append getattr lock };
35auditallow isolated_app { sdcard_type media_rw_data_file }:file { write append };
36
37# For webviews, isolated_app processes can be forked from the webview_zygote
38# in addition to the zygote. Allow access to resources inherited from the
39# webview_zygote process. These rules are specialized copies of the ones in app.te.
40# Inherit FDs from the webview_zygote.
41allow isolated_app webview_zygote:fd use;
42# Notify webview_zygote of child death.
43allow isolated_app webview_zygote:process sigchld;
44# Inherit logd write socket.
45allow isolated_app webview_zygote:unix_dgram_socket write;
46# Read system properties managed by webview_zygote.
47allow isolated_app webview_zygote_tmpfs:file read;
48
49# TODO (b/63631799) fix this access
50# suppress denials to /data/local/tmp
51dontaudit isolated_app shell_data_file:dir search;
52
53#####
54##### Neverallow
55#####
56
57# Do not allow isolated_app to directly open tun_device
58neverallow isolated_app tun_device:chr_file open;
59
60# Isolated apps should not directly open app data files themselves.
61neverallow isolated_app app_data_file:file open;
62
63# Only allow appending to /data/anr/traces.txt (b/27853304, b/18340553)
64# TODO: are there situations where isolated_apps write to this file?
65# TODO: should we tighten these restrictions further?
66neverallow isolated_app anr_data_file:file ~{ open append };
67neverallow isolated_app anr_data_file:dir ~search;
68
69# Isolated apps must not be permitted to use HwBinder
70neverallow isolated_app hwbinder_device:chr_file *;
71neverallow isolated_app *:hwservice_manager *;
72
73# Isolated apps must not be permitted to use VndBinder
74neverallow isolated_app vndbinder_device:chr_file *;
75
76# Isolated apps must not be permitted to perform actions on Binder and VndBinder service_manager
77# except the find actions for services allowlisted below.
78neverallow isolated_app *:service_manager ~find;
79
80# b/17487348
81# Isolated apps can only access three services,
82# activity_service, display_service and webviewupdate_service.
83neverallow isolated_app {
84    service_manager_type
85    -activity_service
86    -display_service
87    -webviewupdate_service
88}:service_manager find;
89
90# Isolated apps shouldn't be able to access the driver directly.
91neverallow isolated_app gpu_device:chr_file { rw_file_perms execute };
92
93# Do not allow isolated_app access to /cache
94neverallow isolated_app cache_file:dir ~{ r_dir_perms };
95neverallow isolated_app cache_file:file ~{ read getattr };
96
97# Do not allow isolated_app to access external storage, except for files passed
98# via file descriptors (b/32896414).
99neverallow isolated_app { storage_file mnt_user_file sdcard_type }:dir ~getattr;
100neverallow isolated_app { storage_file mnt_user_file }:file_class_set *;
101neverallow isolated_app sdcard_type:{ devfile_class_set lnk_file sock_file fifo_file } *;
102neverallow isolated_app sdcard_type:file ~{ read write append getattr lock };
103
104# Do not allow USB access
105neverallow isolated_app { usb_device usbaccessory_device }:chr_file *;
106
107# Restrict the webview_zygote control socket.
108neverallow isolated_app webview_zygote_socket:sock_file write;
109