audioserver.te

# audioserver - audio services daemon
type audioserver, domain, domain_deprecated;
type audioserver_exec, exec_type, file_type;

typeattribute audioserver mlstrustedsubject;

net_domain(audioserver)
init_daemon_domain(audioserver)

r_dir_file(audioserver, sdcard_type)

binder_use(audioserver)
binder_call(audioserver, binderservicedomain)
binder_call(audioserver, { appdomain autoplay_app })
binder_service(audioserver)

# Read access to pseudo filesystems.
r_dir_file(audioserver, proc)

# Required by Widevine DRM (b/22990512)
allow audioserver self:process execmem;

allow audioserver kernel:system module_request;
allow audioserver media_data_file:dir create_dir_perms;
allow audioserver media_data_file:file create_file_perms;
allow audioserver app_data_file:dir search;
allow audioserver app_data_file:file rw_file_perms;
allow audioserver sdcard_type:file write;
allow audioserver gpu_device:chr_file rw_file_perms;
allow audioserver video_device:dir r_dir_perms;
allow audioserver video_device:chr_file rw_file_perms;
allow audioserver audio_device:dir r_dir_perms;
allow audioserver tee_device:chr_file rw_file_perms;

set_prop(audioserver, audio_prop)

# Access audio devices at all.
allow audioserver audio_device:chr_file rw_file_perms;

# XXX Label with a specific type?
allow audioserver sysfs:file r_file_perms;

# Read resources from open apk files passed over Binder.
allow audioserver apk_data_file:file { read getattr };
allow audioserver asec_apk_file:file { read getattr };

# Read /data/data/com.android.providers.telephony files passed over Binder.
allow audioserver radio_data_file:file { read getattr };

# Use pipes passed over Binder from app domains.
allow audioserver { appdomain autoplay_app }:fifo_file { getattr read write };

# Access camera device.
allow audioserver rpmsg_device:chr_file rw_file_perms;

# Inter System processes communicate over named pipe (FIFO)
allow audioserver system_server:fifo_file r_file_perms;

# Camera data
r_dir_file(audioserver, camera_data_file)
r_dir_file(audioserver, media_rw_data_file)

# Grant access to audio files to audioserver
allow audioserver audio_data_file:dir ra_dir_perms;
allow audioserver audio_data_file:file create_file_perms;

# Read/[write] to /proc/net/xt_qtaguid/ctrl and /dev/xt_qtaguid
allow audioserver qtaguid_proc:file rw_file_perms;
allow audioserver qtaguid_device:chr_file r_file_perms;

# Allow abstract socket connection
allow audioserver rild:unix_stream_socket { connectto read write setopt };

# Needed on some devices for playing DRM protected content,
# but seems expected and appropriate for all devices.
unix_socket_connect(audioserver, drmserver, drmserver)

# Needed on some devices for playing audio on paired BT device,
# but seems appropriate for all devices.
unix_socket_connect(audioserver, bluetooth, bluetooth)

# Connect to tee service.
allow audioserver tee:unix_stream_socket connectto;

allow audioserver activity_service:service_manager find;
allow audioserver appops_service:service_manager find;
allow audioserver audioserver_service:service_manager { add find };
allow audioserver cameraproxy_service:service_manager find;
allow audioserver batterystats_service:service_manager find;
allow audioserver drmserver_service:service_manager find;
allow audioserver mediaextractor_service:service_manager find;
allow audioserver mediaserver_service:service_manager find;
allow audioserver permission_service:service_manager find;
allow audioserver power_service:service_manager find;
allow audioserver processinfo_service:service_manager find;
allow audioserver scheduling_policy_service:service_manager find;
allow audioserver surfaceflinger_service:service_manager find;

# /oem access
allow audioserver oemfs:dir search;
allow audioserver oemfs:file r_file_perms;

use_drmservice(audioserver)
allow audioserver drmserver:drmservice {
    consumeRights
    setPlaybackStatus
    openDecryptSession
    closeDecryptSession
    initializeDecryptUnit
    decrypt
    finalizeDecryptUnit
    pread
};

# only allow unprivileged socket ioctl commands
allowxperm audioserver self:{ rawip_socket tcp_socket udp_socket } ioctl unpriv_sock_ioctls;

###
### neverallow rules
###

# audioserver should never execute any executable without a
# domain transition
neverallow audioserver { file_type fs_type }:file execute_no_trans;

# do not allow privileged socket ioctl commands
neverallowxperm audioserver domain:{ rawip_socket tcp_socket udp_socket } ioctl priv_sock_ioctls;