system.te

#
# Apps that run with the system UID, e.g. com.android.system.ui,
# com.android.settings.  These are not as privileged as the system
# server.
#
type system_app, domain;
app_domain(system_app)

# Perform binder IPC to any app domain.
binder_call(system_app, appdomain)
binder_transfer(system_app, appdomain)

# Read and write system data files.
# May want to split into separate types.
allow system_app system_data_file:dir create_dir_perms;
allow system_app system_data_file:file create_file_perms;

# Read wallpaper file.
allow system_app wallpaper_file:file r_file_perms;

# Write to dalvikcache.
allow system_app dalvikcache_data_file:file { write setattr };

# Talk to keystore.
unix_socket_connect(system_app, keystore, keystore)

# Read SELinux enforcing status.
selinux_getenforce(system_app)

bool manage_selinux true;
if (manage_selinux) {
# Set SELinux enforcing status.
selinux_setenforce(system_app)

# Set SELinux booleans.
selinux_setbool(system_app)

# Read syslog to display AVC messages.
allow system_app kernel:system syslog_read;
}

bool manage_mac true;
if (manage_mac) {
# Set properties via the init property service.
unix_socket_connect(system_app, property, init)

# Set the persist.mac_enforcing_mode property.
allow system_app system_prop:property_service set;

# Run logcat and read the logs for MAC denials.
allow system_app system_file:file x_file_perms;
allow system_app log_device:chr_file read;
}

#
# System Server aka system_server spawned by zygote.
# Most of the framework services run in this process.
#
type system, domain, mlstrustedsubject;

# Child of the zygote.
allow system zygote:fd use;
allow system zygote:process sigchld;
allow system zygote_tmpfs:file read;

# system server gets network and bluetooth permissions.
net_domain(system)
bluetooth_domain(system)

# These are the capabilities assigned by the zygote to the
# system server.
# XXX See if we can remove some of these.
allow system self:capability { kill net_bind_service net_broadcast net_admin net_raw sys_module sys_boot sys_nice sys_resource sys_time sys_tty_config };

# Trigger module auto-load.
allow system kernel:system module_request;

# Use netlink uevent sockets.
allow system self:netlink_kobject_uevent_socket *;

# Kill apps.
allow system appdomain:process { sigkill signal };

# Set scheduling info for apps.
allow system appdomain:process { getsched setsched };
allow system mediaserver:process { getsched setsched };

# Read /proc data for apps.
allow system appdomain:dir r_dir_perms;
allow system appdomain:{ file lnk_file } rw_file_perms;

# Read/Write to /proc/net/xt_qtaguid/ctrl and and /dev/xt_qtaguid.
allow system qtaguid_proc:file rw_file_perms;
allow system qtaguid_device:chr_file rw_file_perms;

# WifiWatchdog uses a packet_socket
allow system self:packet_socket *;

# Notify init of death.
allow system init:process sigchld;

# Talk to init and various daemons via sockets.
unix_socket_connect(system, property, init)
unix_socket_connect(system, qemud, qemud)
unix_socket_connect(system, installd, installd)
unix_socket_connect(system, netd, netd)
unix_socket_connect(system, vold, vold)
unix_socket_connect(system, zygote, zygote)
unix_socket_connect(system, keystore, keystore)
unix_socket_connect(system, dbus, dbusd)
unix_socket_connect(system, gps, gpsd)
unix_socket_connect(system, bluetooth, bluetoothd)
unix_socket_send(system, wpa, wpa)

# Communicate over a socket created by surfaceflinger.
allow system surfaceflinger:unix_stream_socket { read write setopt };

# Perform Binder IPC.
tmpfs_domain(system)
binder_use(system)
binder_call(system, binderservicedomain)
binder_call(system, appdomain)
binder_service(system)
# Transfer other Binder references.
binder_transfer(system, binderservicedomain)
binder_transfer(system, appdomain)

# Read /proc/pid files for Binder clients.
r_dir_file(system, appdomain)
r_dir_file(system, mediaserver)
allow system appdomain:process getattr;
allow system mediaserver:process getattr;

# Specify any arguments to zygote.
allow system self:zygote *;

# Check SELinux permissions.
selinux_check_access(system)

# XXX Label sysfs files with a specific type?
allow system sysfs:file rw_file_perms;
allow system sysfs_nfc_power_writable:file rw_file_perms;

# Access devices.
allow system device:dir r_dir_perms;
allow system device:sock_file rw_file_perms;
allow system akm_device:chr_file rw_file_perms;
allow system accelerometer_device:chr_file rw_file_perms;
allow system alarm_device:chr_file rw_file_perms;
allow system graphics_device:dir search;
allow system graphics_device:chr_file rw_file_perms;
allow system input_device:dir r_dir_perms;
allow system input_device:chr_file rw_file_perms;
allow system tty_device:chr_file rw_file_perms;
allow system urandom_device:chr_file rw_file_perms;
allow system video_device:chr_file rw_file_perms;
allow system qemu_device:chr_file rw_file_perms;

# Manage data files.
allow system data_file_type:dir create_dir_perms;
allow system data_file_type:notdevfile_class_set create_file_perms;

# Read /file_contexts.
allow system rootfs:file r_file_perms;

# Relabel apk files.
allow system apk_tmp_file:file { relabelfrom relabelto };
allow system apk_data_file:file { relabelfrom relabelto };

# Relabel wallpaper.
allow system system_data_file:file relabelfrom;
allow system wallpaper_file:file relabelto;
allow system wallpaper_file:file rw_file_perms;

# Relabel /data/anr.
allow system system_data_file:dir relabelfrom;
allow system anr_data_file:dir relabelto;

# Property Service write
allow system system_prop:property_service set;
allow system radio_prop:property_service set;

# ctl interface
allow system ctl_default_prop:property_service set;

# Create a socket for receiving info from wpa.
type_transition system wifi_data_file:sock_file system_wpa_socket;
allow system system_wpa_socket:sock_file create_file_perms;

# Manage cache files.
allow system cache_file:dir { relabelfrom create_dir_perms };
allow system cache_file:file { relabelfrom create_file_perms };

# Run system programs, e.g. dexopt.
allow system system_file:file x_file_perms;

# Allow reading of /proc/pid data for other domains.
# XXX dontaudit candidate
allow system domain:dir r_dir_perms;
allow system domain:file r_file_perms;

# LocationManager(e.g, GPS) needs to read and write
# to uart driver and ctrl proc entry
allow system gps_device:chr_file rw_file_perms;
allow system gps_control:file rw_file_perms;

# system Read/Write udp_socket of untrusted_app
allow system appdomain:udp_socket { read write };
# Allow abstract socket connection
allow system rild:unix_stream_socket connectto;

# connect to vpn tunnel
allow system mtp:unix_stream_socket { connectto };

# BackupManagerService lets PMS create a data backup file
allow system cache_backup_file:file create_file_perms;
# Relabel /data/backup
allow system backup_data_file:dir { relabelto relabelfrom };
# Relabel /cache/.*\.{data|restore}
allow system cache_backup_file:file { relabelto relabelfrom };
# LocalTransport creates and relabels /cache/backup
allow system cache_backup_file:dir { relabelto relabelfrom create_dir_perms };