platform_system_sepolicy/public/keystore.te

type keystore, domain, domain_deprecated;
type keystore_exec, exec_type, file_type;

# keystore daemon
typeattribute keystore mlstrustedsubject;
binder_use(keystore)
binder_service(keystore)
binder_call(keystore, system_server)
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 };
allow keystore tee_device:chr_file rw_file_perms;
allow keystore tee:unix_stream_socket connectto;

allow keystore keystore_service:service_manager { add find };
allow keystore sec_key_att_app_id_provider_service:service_manager find;

# Check SELinux permissions.
selinux_check_access(keystore)

allow keystore ion_device:chr_file r_file_perms;
r_dir_file(keystore, cgroup)

###
### 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 *;

neverallow * keystore:process ptrace;