blob: c5f7013caebef38559f341d23973853dc70d87e0 [file] [log] [blame]
###
### A domain for further sandboxing privileged apps.
###
typeattribute priv_app coredomain;
app_domain(priv_app)
# Access the network.
net_domain(priv_app)
# Access bluetooth.
bluetooth_domain(priv_app)
# Allow the allocation and use of ptys
# Used by: https://play.privileged.com/store/apps/details?id=jackpal.androidterm
create_pty(priv_app)
# Allow loading executable code from writable priv-app home
# directories. This is a W^X violation, however, it needs
# to be supported for now for the following reasons.
# * /data/user_*/0/*/code_cache/* POSSIBLE uses (b/117841367)
# 1) com.android.opengl.shaders_cache
# 2) com.android.skia.shaders_cache
# 3) com.android.renderscript.cache
# * /data/user_de/0/com.google.android.gms/app_chimera
# TODO: Tighten (b/112357170)
allow priv_app privapp_data_file:file execute;
# Chrome Crashpad uses the the dynamic linker to load native executables
# from an APK (b/112050209, crbug.com/928422)
allow priv_app system_linker_exec:file execute_no_trans;
allow priv_app privapp_data_file:lnk_file create_file_perms;
# Priv apps can find services that expose both @SystemAPI and normal APIs.
allow priv_app app_api_service:service_manager find;
allow priv_app system_api_service:service_manager find;
allow priv_app audioserver_service:service_manager find;
allow priv_app cameraserver_service:service_manager find;
allow priv_app drmserver_service:service_manager find;
allow priv_app mediadrmserver_service:service_manager find;
allow priv_app mediaextractor_service:service_manager find;
allow priv_app mediametrics_service:service_manager find;
allow priv_app mediaserver_service:service_manager find;
allow priv_app network_watchlist_service:service_manager find;
allow priv_app nfc_service:service_manager find;
allow priv_app oem_lock_service:service_manager find;
allow priv_app persistent_data_block_service:service_manager find;
allow priv_app radio_service:service_manager find;
allow priv_app recovery_service:service_manager find;
allow priv_app stats_service:service_manager find;
# Allow privileged apps to interact with gpuservice
binder_call(priv_app, gpuservice)
allow priv_app gpu_service:service_manager find;
# Write to /cache.
allow priv_app { cache_file cache_recovery_file }:dir create_dir_perms;
allow priv_app { cache_file cache_recovery_file }:file create_file_perms;
# /cache is a symlink to /data/cache on some devices. Allow reading the link.
allow priv_app cache_file:lnk_file r_file_perms;
# Access to /data/media.
allow priv_app media_rw_data_file:dir create_dir_perms;
allow priv_app media_rw_data_file:file create_file_perms;
# Used by Finsky / Android "Verify Apps" functionality when
# running "adb install foo.apk".
allow priv_app shell_data_file:file r_file_perms;
allow priv_app shell_data_file:dir r_dir_perms;
# Allow traceur to pass file descriptors through a content provider to betterbug
allow priv_app trace_data_file:file { getattr read };
# Allow verifier to access staged apks.
allow priv_app { apk_tmp_file apk_private_tmp_file }:dir r_dir_perms;
allow priv_app { apk_tmp_file apk_private_tmp_file }:file r_file_perms;
# For AppFuse.
allow priv_app vold:fd use;
allow priv_app fuse_device:chr_file { read write };
# /proc access
allow priv_app {
proc_vmstat
}:file r_file_perms;
allow priv_app sysfs_type:dir search;
# Read access to /sys/class/net/wlan*/address
r_dir_file(priv_app, sysfs_net)
# Read access to /sys/block/zram*/mm_stat
r_dir_file(priv_app, sysfs_zram)
r_dir_file(priv_app, rootfs)
# access the mac address
allowxperm priv_app self:udp_socket ioctl SIOCGIFHWADDR;
# Allow com.android.vending to communicate with statsd.
binder_call(priv_app, statsd)
# Allow Phone to read/write cached ringtones (opened by system).
allow priv_app ringtone_file:file { getattr read write };
# Access to /data/preloads
allow priv_app preloads_data_file:file r_file_perms;
allow priv_app preloads_data_file:dir r_dir_perms;
allow priv_app preloads_media_file:file r_file_perms;
allow priv_app preloads_media_file:dir r_dir_perms;
read_runtime_log_tags(priv_app)
# Write app-specific trace data to the Perfetto traced damon. This requires
# connecting to its producer socket and obtaining a (per-process) tmpfs fd.
perfetto_producer(priv_app)
# Allow priv_apps to request and collect incident reports.
# (Also requires DUMP and PACKAGE_USAGE_STATS permissions)
allow priv_app incident_service:service_manager find;
binder_call(priv_app, incidentd)
allow priv_app incidentd:fifo_file { read write };
# Allow profiling if the app opts in by being marked profileable/debuggable.
can_profile_heap(priv_app)
can_profile_perf(priv_app)
# Allow priv_apps to check whether Dynamic System Update is enabled
get_prop(priv_app, dynamic_system_prop)
# suppress denials for non-API accesses.
dontaudit priv_app exec_type:file getattr;
dontaudit priv_app device:dir read;
dontaudit priv_app fs_bpf:dir search;
dontaudit priv_app net_dns_prop:file read;
dontaudit priv_app proc:file read;
dontaudit priv_app proc_interrupts:file read;
dontaudit priv_app proc_modules:file read;
dontaudit priv_app proc_net:file read;
dontaudit priv_app proc_stat:file read;
dontaudit priv_app proc_version:file read;
dontaudit priv_app sysfs:dir read;
dontaudit priv_app sysfs:file read;
dontaudit priv_app sysfs_android_usb:file read;
dontaudit priv_app sysfs_dm:file r_file_perms;
dontaudit priv_app wifi_prop:file read;
dontaudit priv_app { wifi_prop exported_wifi_prop }:file read;
# allow privileged apps to use UDP sockets provided by the system server but not
# modify them other than to connect
allow priv_app system_server:udp_socket {
connect getattr read recvfrom sendto write getopt setopt };
# allow apps like Phonesky to check the file signature of an apk installed on
# the Incremental File System, and fill missing blocks in the apk
allowxperm priv_app apk_data_file:file ioctl { INCFS_IOCTL_READ_SIGNATURE INCFS_IOCTL_FILL_BLOCKS };
# allow privileged data loader apps (e.g. com.android.vending) to read logs from Incremental File System
allow priv_app incremental_control_file:file { read getattr ioctl };
# allow apps like Phonesky to request permission to fill blocks of an apk file
# on the Incremental File System.
allowxperm priv_app incremental_control_file:file ioctl INCFS_IOCTL_PERMIT_FILL;
# Required for Phonesky to be able to read APEX files under /data/apex/active/.
allow priv_app apex_data_file:dir search;
allow priv_app staging_data_file:file r_file_perms;
###
### neverallow rules
###
# Receive or send uevent messages.
neverallow priv_app domain:netlink_kobject_uevent_socket *;
# Receive or send generic netlink messages
neverallow priv_app domain:netlink_socket *;
# Too much leaky information in debugfs. It's a security
# best practice to ensure these files aren't readable.
neverallow priv_app debugfs:file read;
# Do not allow privileged apps to register services.
# Only trusted components of Android should be registering
# services.
neverallow priv_app service_manager_type:service_manager add;
# Do not allow privileged apps to connect to the property service
# or set properties. b/10243159
neverallow priv_app property_socket:sock_file write;
neverallow priv_app init:unix_stream_socket connectto;
neverallow priv_app property_type:property_service set;
# Do not allow priv_app to be assigned mlstrustedsubject.
# This would undermine the per-user isolation model being
# enforced via levelFrom=user in seapp_contexts and the mls
# constraints. As there is no direct way to specify a neverallow
# on attribute assignment, this relies on the fact that fork
# permission only makes sense within a domain (hence should
# never be granted to any other domain within mlstrustedsubject)
# and priv_app is allowed fork permission to itself.
neverallow priv_app mlstrustedsubject:process fork;
# Do not allow priv_app to hard link to any files.
# In particular, if priv_app links to other app data
# files, installd will not be able to guarantee the deletion
# of the linked to file. Hard links also contribute to security
# bugs, so we want to ensure priv_app never has this
# capability.
neverallow priv_app file_type:file link;
# priv apps should not be able to open trace data files, they should depend
# upon traceur to pass a file descriptor which they can then read
neverallow priv_app trace_data_file:dir *;
neverallow priv_app trace_data_file:file { no_w_file_perms open };
# Do not allow priv_app access to cgroups.
neverallow priv_app cgroup:file *;
# Do not allow loading executable code from non-privileged
# application home directories. Code loading across a security boundary
# is dangerous and allows a full compromise of a privileged process
# by an unprivileged process. b/112357170
neverallow priv_app app_data_file:file no_x_file_perms;
# Do not follow untrusted app provided symlinks
neverallow priv_app app_data_file:lnk_file { open read getattr };