selinux-refpolicy/policy/modules/kernel/selinux.te

policy_module(selinux, 1.10.1)

########################################
#
# Declarations
#

## <desc>
## <p>
## Boolean to determine whether the system permits loading policy, setting
## enforcing mode, and changing boolean values.  Set this to true and you
## have to reboot to set it back.
## </p>
## </desc>
gen_bool(secure_mode_policyload,false)

attribute boolean_type;
attribute can_load_policy;
attribute can_setenforce;
attribute can_setsecparam;
attribute selinux_unconfined_type;

type secure_mode_policyload_t;
selinux_labeled_boolean(secure_mode_policyload_t, secure_mode_policyload)

# 
# security_t is the target type when checking
# the permissions in the security class.  It is also
# applied to selinuxfs inodes.
#
type security_t, boolean_type;
fs_type(security_t)
mls_trusted_object(security_t)
sid security gen_context(system_u:object_r:security_t,mls_systemhigh)
genfscon selinuxfs / gen_context(system_u:object_r:security_t,s0)
genfscon securityfs / gen_context(system_u:object_r:security_t,s0)

neverallow ~{ selinux_unconfined_type can_load_policy } security_t:security load_policy;
neverallow ~{ selinux_unconfined_type can_setenforce } security_t:security setenforce;
neverallow ~{ selinux_unconfined_type can_setsecparam } security_t:security setsecparam;

########################################
#
# Unconfined access to this module
#

# use SELinuxfs
allow selinux_unconfined_type security_t:dir list_dir_perms;
allow selinux_unconfined_type security_t:file rw_file_perms;
allow selinux_unconfined_type boolean_type:file read_file_perms;
allow selinux_unconfined_type { boolean_type -secure_mode_policyload_t }:file write_file_perms;

# Access the security API.
allow selinux_unconfined_type security_t:security ~{ load_policy setenforce };

ifdef(`distro_rhel4',`
	# needed for systems without audit support
	auditallow selinux_unconfined_type security_t:security setbool;
')

if(!secure_mode_policyload) {
	allow selinux_unconfined_type security_t:security { load_policy setenforce };
	allow selinux_unconfined_type secure_mode_policyload_t:file write_file_perms;

	ifdef(`distro_rhel4',`
		# needed for systems without audit support
		auditallow selinux_unconfined_type security_t:security { load_policy setenforce };
	')
}