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 privapp_data_file }:file { append read write getattr lock map };
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# media_rw_data_file is included for sdcardfs, and can be removed if sdcardfs
31# is modified to change the secontext when accessing the lower filesystem.
32allow isolated_app { sdcard_type media_rw_data_file }:file { read write append getattr lock map };
33
34# For webviews, isolated_app processes can be forked from the webview_zygote
35# in addition to the zygote. Allow access to resources inherited from the
36# webview_zygote process. These rules are specialized copies of the ones in app.te.
37# Inherit FDs from the webview_zygote.
38allow isolated_app webview_zygote:fd use;
39# Notify webview_zygote of child death.
40allow isolated_app webview_zygote:process sigchld;
41# Inherit logd write socket.
42allow isolated_app webview_zygote:unix_dgram_socket write;
43# Read system properties managed by webview_zygote.
44allow isolated_app webview_zygote_tmpfs:file read;
45
46# Inherit FDs from the app_zygote.
47allow isolated_app app_zygote:fd use;
48# Notify app_zygote of child death.
49allow isolated_app app_zygote:process sigchld;
50# Inherit logd write socket.
51allow isolated_app app_zygote:unix_dgram_socket write;
52
53# TODO (b/63631799) fix this access
54# suppress denials to /data/local/tmp
55dontaudit isolated_app shell_data_file:dir search;
56
57# Write app-specific trace data to the Perfetto traced damon. This requires
58# connecting to its producer socket and obtaining a (per-process) tmpfs fd.
59allow isolated_app traced:fd use;
60allow isolated_app traced_tmpfs:file { read write getattr map };
61unix_socket_connect(isolated_app, traced_producer, traced)
62
63# Allow heap profiling if the main app has been marked as profileable or
64# debuggable.
65can_profile_heap(isolated_app)
66
67allow isolated_app ashmem_device:chr_file { getattr read ioctl lock map append write };
68
69#####
70##### Neverallow
71#####
72
73# Isolated apps should not directly open app data files themselves.
74neverallow isolated_app { app_data_file privapp_data_file }:file open;
75
76# Only allow appending to /data/anr/traces.txt (b/27853304, b/18340553)
77# TODO: are there situations where isolated_apps write to this file?
78# TODO: should we tighten these restrictions further?
79neverallow isolated_app anr_data_file:file ~{ open append };
80neverallow isolated_app anr_data_file:dir ~search;
81
82# Isolated apps must not be permitted to use HwBinder
83neverallow isolated_app hwbinder_device:chr_file *;
84neverallow isolated_app *:hwservice_manager *;
85
86# Isolated apps must not be permitted to use VndBinder
87neverallow isolated_app vndbinder_device:chr_file *;
88
89# Isolated apps must not be permitted to perform actions on Binder and VndBinder service_manager
90# except the find actions for services allowlisted below.
91neverallow isolated_app *:service_manager ~find;
92
93# b/17487348
94# Isolated apps can only access three services,
95# activity_service, display_service, webviewupdate_service, and
96# ashmem_device_service.
97neverallow isolated_app {
98    service_manager_type
99    -activity_service
100    -ashmem_device_service
101    -display_service
102    -webviewupdate_service
103}:service_manager find;
104
105# Isolated apps shouldn't be able to access the driver directly.
106neverallow isolated_app gpu_device:chr_file { rw_file_perms execute };
107
108# Do not allow isolated_app access to /cache
109neverallow isolated_app cache_file:dir ~{ r_dir_perms };
110neverallow isolated_app cache_file:file ~{ read getattr };
111
112# Do not allow isolated_app to access external storage, except for files passed
113# via file descriptors (b/32896414).
114neverallow isolated_app { storage_file mnt_user_file sdcard_type }:dir ~getattr;
115neverallow isolated_app { storage_file mnt_user_file }:file_class_set *;
116neverallow isolated_app sdcard_type:{ devfile_class_set lnk_file sock_file fifo_file } *;
117neverallow isolated_app sdcard_type:file ~{ read write append getattr lock map };
118
119# Do not allow USB access
120neverallow isolated_app { usb_device usbaccessory_device }:chr_file *;
121
122# Restrict the webview_zygote control socket.
123neverallow isolated_app webview_zygote:sock_file write;
124
125# Limit the /sys files which isolated_app can access. This is important
126# for controlling isolated_app attack surface.
127neverallow isolated_app {
128  sysfs_type
129  -sysfs_devices_system_cpu
130  -sysfs_transparent_hugepage
131  -sysfs_usb # TODO: check with audio team if needed for isolated_app (b/28417852)
132}:file no_rw_file_perms;
133
134# No creation of sockets families other than AF_UNIX sockets.
135# List taken from system/sepolicy/public/global_macros - socket_class_set
136# excluding unix_stream_socket and unix_dgram_socket.
137# Many of these are socket families which have never and will never
138# be compiled into the Android kernel.
139neverallow isolated_app self:{
140  socket tcp_socket udp_socket rawip_socket netlink_socket packet_socket
141  key_socket appletalk_socket netlink_route_socket
142  netlink_tcpdiag_socket netlink_nflog_socket netlink_xfrm_socket
143  netlink_selinux_socket netlink_audit_socket netlink_dnrt_socket
144  netlink_kobject_uevent_socket tun_socket netlink_iscsi_socket
145  netlink_fib_lookup_socket netlink_connector_socket netlink_netfilter_socket
146  netlink_generic_socket netlink_scsitransport_socket netlink_rdma_socket
147  netlink_crypto_socket sctp_socket icmp_socket ax25_socket ipx_socket
148  netrom_socket atmpvc_socket x25_socket rose_socket decnet_socket atmsvc_socket
149  rds_socket irda_socket pppox_socket llc_socket can_socket tipc_socket
150  bluetooth_socket iucv_socket rxrpc_socket isdn_socket phonet_socket
151  ieee802154_socket caif_socket alg_socket nfc_socket vsock_socket kcm_socket
152  qipcrtr_socket smc_socket xdp_socket
153} create;
154