platform_system_sepolicy/private/keystore.te

typeattribute keystore coredomain;

init_daemon_domain(keystore)

# talk to keymaster
hal_client_domain(keystore, hal_keymaster)

# talk to confirmationui
hal_client_domain(keystore, hal_confirmationui)

# talk to keymint
hal_client_domain(keystore, hal_keymint)

# Ignore keystore attempts to access the AVF RKP Hal but keystore is not suppose to
# access it.
# TODO(b/312427637): Investigate the reason and fix the denial.
dontaudit keystore hal_remotelyprovisionedcomponent_avf_service:service_manager { find };

# This is used for the ConfirmationUI async callback.
allow keystore platform_app:binder call;

# Allow to check whether security logging is enabled.
get_prop(keystore, device_logging_prop)

# Allow keystore to check if the system is rkp only.
get_prop(keystore, remote_prov_prop)

# Allow keystore to check rkpd feature flags
get_prop(keystore, device_config_remote_key_provisioning_native_prop)

# Allow keystore to write to statsd.
unix_socket_send(keystore, statsdw, statsd)

# Keystore need access to the keystore2_key_contexts file to load the keystore key backend.
allow keystore keystore2_key_contexts_file:file r_file_perms;

# Allow keystore to listen to changing boot levels
get_prop(keystore, keystore_listen_prop)

# Keystore needs to transfer binder references to vold so that it
# can call keystore methods on those references.
allow keystore vold:binder transfer;

set_prop(keystore, keystore_crash_prop)

# keystore is using apex_info via libvintf
use_apex_info(keystore)

typeattribute keystore mlstrustedsubject;
binder_use(keystore)
binder_service(keystore)
binder_call(keystore, remote_provisioning_service_server)
binder_call(keystore, system_server)
binder_call(keystore, wificond)

allow keystore keystore_data_file:dir create_dir_perms;
allow keystore keystore_data_file:notdevfile_class_set create_file_perms;
allow keystore keystore_exec:file { getattr };

add_service(keystore, keystore_service)
allow keystore sec_key_att_app_id_provider_service:service_manager find;
allow keystore dropbox_service:service_manager find;
allow keystore remote_provisioning_service:service_manager find;
add_service(keystore, apc_service)
add_service(keystore, keystore_compat_hal_service)
add_service(keystore, authorization_service)
add_service(keystore, keystore_maintenance_service)
add_service(keystore, keystore_metrics_service)
add_service(keystore, legacykeystore_service)

# Check SELinux permissions.
selinux_check_access(keystore)

r_dir_file(keystore, cgroup)
r_dir_file(keystore, cgroup_v2)

# The software KeyMint implementation used in km_compat needs
# to read the vendor security patch level.
get_prop(keystore, vendor_security_patch_level_prop);

# Allow keystore to read its vendor configuration
get_prop(keystore, keystore_config_prop)

###
### Neverallow rules
###
### Protect ourself from others
###

neverallow { domain -keystore } keystore_data_file:dir ~{ open create read getattr setattr search relabelto ioctl };
neverallow { domain -keystore } keystore_data_file:notdevfile_class_set ~{ relabelto getattr };

neverallow { domain -keystore -init } keystore_data_file:dir *;
neverallow { domain -keystore -init } keystore_data_file:notdevfile_class_set *;

# TODO(b/186868271): Remove the crash dump exception soon-ish (maybe by May 14, 2021?)
neverallow { domain userdebug_or_eng(`-crash_dump') } keystore:process ptrace;

# Only keystore can set keystore.crash_count system property. Since init is allowed to set any
# system property, an exception is added for init as well.
neverallow { domain -keystore -init } keystore_crash_prop:property_service set;