microdroid/sepolicy/system/private/app.te

# Allow apps to read the Test Harness Mode property. This property is used in
# the implementation of ActivityManager.isDeviceInTestHarnessMode()
get_prop(appdomain, test_harness_prop)

get_prop(appdomain, boot_status_prop)
get_prop(appdomain, dalvik_config_prop)
get_prop(appdomain, media_config_prop)
get_prop(appdomain, packagemanager_config_prop)
get_prop(appdomain, radio_control_prop)
get_prop(appdomain, surfaceflinger_color_prop)
get_prop(appdomain, systemsound_config_prop)
get_prop(appdomain, telephony_config_prop)
get_prop(appdomain, userspace_reboot_config_prop)
get_prop(appdomain, vold_config_prop)
get_prop(appdomain, adbd_config_prop)

# Allow ART to be configurable via device_config properties
# (ART "runs" inside the app process)
get_prop(appdomain, device_config_runtime_native_prop)
get_prop(appdomain, device_config_runtime_native_boot_prop)

userdebug_or_eng(`perfetto_producer({ appdomain })')

# Prevent apps from causing presubmit failures.
# Apps can cause selinux denials by accessing CE storage
# and/or external storage. In either case, the selinux denial is
# not the cause of the failure, but just a symptom that
# storage isn't ready. Many apps handle the failure appropriately.
#
# Apps cannot access external storage before it becomes available.
dontaudit appdomain storage_stub_file:dir getattr;
# Attempts to write to system_data_file is generally a sign
# that apps are attempting to access encrypted storage before
# the ACTION_USER_UNLOCKED intent is delivered. Apps are not
# allowed to write to CE storage before it's available.
# Attempting to do so will be blocked by both selinux and unix
# permissions.
dontaudit appdomain system_data_file:dir write;
# Apps should not be reading vendor-defined properties.
dontaudit appdomain vendor_default_prop:file read;

# Access to /mnt/media_rw/<vol> (limited by DAC to apps with external_storage gid)
allow appdomain mnt_media_rw_file:dir search;

neverallow appdomain system_server:udp_socket {
        accept append bind create ioctl listen lock name_bind
        relabelfrom relabelto setattr shutdown };

# Transition to a non-app domain.
# Exception for the shell and su domains, can transition to runas, etc.
# Exception for crash_dump to allow for app crash reporting.
# Exception for renderscript binaries (/system/bin/bcc, /system/bin/ld.mc)
# to allow renderscript to create privileged executable files.
neverallow { appdomain -shell userdebug_or_eng(`-su') }
    { domain -appdomain -crash_dump -rs }:process { transition };
neverallow { appdomain -shell userdebug_or_eng(`-su') }
    { domain -appdomain }:process { dyntransition };

# Don't allow regular apps access to storage configuration properties.
neverallow { appdomain -mediaprovider_app } storage_config_prop:file no_rw_file_perms;

# Allow to read sendbug.preferred.domain
get_prop(appdomain, sendbug_config_prop)

# Allow to read graphics related properties.
get_prop(appdomain, graphics_config_prop)

# Allow to read persist.config.calibration_fac
get_prop(appdomain, camera_calibration_prop)

# Allow to read db.log.detailed, db.log.slow_query_threshold*
get_prop(appdomain, sqlite_log_prop)

# Allow font file read by apps.
allow appdomain font_data_file:file r_file_perms;
allow appdomain font_data_file:dir r_dir_perms;

# Enter /data/misc/apexdata/
allow appdomain apex_module_data_file:dir search;
# Read /data/misc/apexdata/com.android.art, execute signed AOT artifacts.
allow appdomain apex_art_data_file:dir r_dir_perms;
allow appdomain apex_art_data_file:file rx_file_perms;

# Allow access to tombstones if an fd to one is given to you.
# This is restricted by unix permissions, so an app must go through system_server to get one.
allow appdomain tombstone_data_file:file { getattr read };
neverallow appdomain tombstone_data_file:file ~{ getattr read };

# Sensitive app domains are not allowed to execute from /data
# to prevent persistence attacks and ensure all code is executed
# from read-only locations.
neverallow {
  bluetooth
  isolated_app
  nfc
  radio
  shared_relro
  system_app
} {
  data_file_type
  -apex_art_data_file
  -dalvikcache_data_file
  -system_data_file # shared libs in apks
  -apk_data_file
}:file no_x_file_perms;