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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#####
50##### Neverallow
51#####
52
53# Do not allow isolated_app to directly open tun_device
54neverallow isolated_app tun_device:chr_file open;
55
56# Isolated apps should not directly open app data files themselves.
57neverallow isolated_app app_data_file:file open;
58
59# Only allow appending to /data/anr/traces.txt (b/27853304, b/18340553)
60# TODO: are there situations where isolated_apps write to this file?
61# TODO: should we tighten these restrictions further?
62neverallow isolated_app anr_data_file:file ~{ open append };
63neverallow isolated_app anr_data_file:dir ~search;
64
65# b/17487348
66# Isolated apps can only access three services,
67# activity_service, display_service and webviewupdate_service.
68neverallow isolated_app {
69    service_manager_type
70    -activity_service
71    -display_service
72    -webviewupdate_service
73}:service_manager find;
74
75# Isolated apps shouldn't be able to access the driver directly.
76neverallow isolated_app gpu_device:chr_file { rw_file_perms execute };
77
78# Do not allow isolated_app access to /cache
79neverallow isolated_app cache_file:dir ~{ r_dir_perms };
80neverallow isolated_app cache_file:file ~{ read getattr };
81
82# Do not allow isolated_app to access external storage, except for files passed
83# via file descriptors (b/32896414).
84neverallow isolated_app { storage_file mnt_user_file sdcard_type }:dir ~getattr;
85neverallow isolated_app { storage_file mnt_user_file }:file_class_set *;
86neverallow isolated_app sdcard_type:{ devfile_class_set lnk_file sock_file fifo_file } *;
87neverallow isolated_app sdcard_type:file ~{ read write append getattr lock };
88
89# Do not allow USB access
90neverallow isolated_app { usb_device usbaccessory_device }:chr_file *;
91
92# Restrict the webview_zygote control socket.
93neverallow isolated_app webview_zygote_socket:sock_file write;
94