selinux-policy/policy/modules/services/kerberos.if

## <summary>MIT Kerberos admin and KDC</summary>
## <desc>
##	<p>
##	This policy supports:
##	</p>
##	<p>
##	Servers:
##	<ul>
##		<li>kadmind</li>
##		<li>krb5kdc</li>
##	</ul>
##	</p>
##	<p>
##	Clients:
##	<ul>
##		<li>kinit</li>
##		<li>kdestroy</li>
##		<li>klist</li>
##		<li>ksu (incomplete)</li>
##	</ul>
##	</p>
## </desc>

########################################
## <summary>
##	Execute kadmind in the current domain
## </summary>
## <param name="domain">
## <summary>
##	Domain allowed access.
## </summary>
## </param>
#
interface(`kerberos_exec_kadmind',`
	gen_require(`
		type kadmind_exec_t;
	')

	can_exec($1, kadmind_exec_t)
')

########################################
## <summary>
##	Execute a domain transition to run kpropd.
## </summary>
## <param name="domain">
## <summary>
##	Domain allowed to transition.
## </summary>
## </param>
#
interface(`kerberos_domtrans_kpropd',`
	gen_require(`
		type kpropd_t, kpropd_exec_t;
	')

	domtrans_pattern($1, kpropd_exec_t, kpropd_t)
')

########################################
## <summary>
##	Use kerberos services
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`kerberos_use',`
	gen_require(`
		type krb5_conf_t, krb5kdc_conf_t;
	')

	files_search_etc($1)
	allow $1 krb5_conf_t:file read_file_perms;
	dontaudit $1 krb5_conf_t:file write;
	dontaudit $1 krb5kdc_conf_t:dir list_dir_perms;
	dontaudit $1 krb5kdc_conf_t:file rw_file_perms;

	#kerberos libraries are attempting to set the correct file context
	dontaudit $1 self:process setfscreate;
	selinux_dontaudit_validate_context($1)
	seutil_dontaudit_read_file_contexts($1)

	tunable_policy(`allow_kerberos',`
		allow $1 self:tcp_socket create_socket_perms;
		allow $1 self:udp_socket create_socket_perms;

		corenet_all_recvfrom_unlabeled($1)
		corenet_all_recvfrom_netlabel($1)
		corenet_tcp_sendrecv_all_if($1)
		corenet_udp_sendrecv_all_if($1)
		corenet_tcp_sendrecv_all_nodes($1)
		corenet_udp_sendrecv_all_nodes($1)
		corenet_tcp_sendrecv_kerberos_port($1)
		corenet_udp_sendrecv_kerberos_port($1)
		corenet_tcp_bind_all_nodes($1)
		corenet_udp_bind_all_nodes($1)
		corenet_tcp_connect_kerberos_port($1)
		corenet_tcp_connect_ocsp_port($1)
		corenet_sendrecv_kerberos_client_packets($1)
		corenet_sendrecv_ocsp_client_packets($1)
	')

	optional_policy(`
		tunable_policy(`allow_kerberos',`
			pcscd_stream_connect($1)
		')
	')
')

########################################
## <summary>
##	Read the kerberos configuration file (/etc/krb5.conf).
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`kerberos_read_config',`
	gen_require(`
		type krb5_conf_t;
	')

	files_search_etc($1)
	allow $1 krb5_conf_t:file read_file_perms;
')

########################################
## <summary>
##	Do not audit attempts to write the kerberos
##	configuration file (/etc/krb5.conf).
## </summary>
## <param name="domain">
##	<summary>
##	Domain to not audit.
##	</summary>
## </param>
#
interface(`kerberos_dontaudit_write_config',`
	gen_require(`
		type krb5_conf_t;
	')

	dontaudit $1 krb5_conf_t:file write;
')

########################################
## <summary>
##	Read and write the kerberos configuration file (/etc/krb5.conf).
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`kerberos_rw_config',`
	gen_require(`
		type krb5_conf_t;
	')

	files_search_etc($1)
	allow $1 krb5_conf_t:file rw_file_perms;
')

########################################
## <summary>
##	Read the kerberos key table.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`kerberos_read_keytab',`
	gen_require(`
		type krb5_keytab_t;
	')

	files_search_etc($1)
	allow $1 krb5_keytab_t:file read_file_perms;
')

########################################
## <summary>
##	Create a derived type for kerberos keytab
## </summary>
## <param name="prefix">
##	<summary>
##	The prefix to be used for deriving type names.
##	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
template(`kerberos_keytab_template',`
	type $1_keytab_t;
	files_type($1_keytab_t)

 	allow $2 $1_keytab_t:file read_file_perms;

	kerberos_read_keytab($2)
	kerberos_use($2)
')

########################################
## <summary>
##	Read the kerberos kdc configuration file (/etc/krb5kdc.conf).
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`kerberos_read_kdc_config',`
	gen_require(`
		type krb5kdc_conf_t;
	')

	files_search_etc($1)
	read_files_pattern($1, krb5kdc_conf_t, krb5kdc_conf_t)
')

########################################
## <summary>
##	Read the kerberos kdc configuration file (/etc/krb5kdc.conf).
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`kerberos_manage_host_rcache',`
	gen_require(`
		type krb5_host_rcache_t;
	')

	# creates files as system_u no matter what the selinux user
	# cjp: should be in the below tunable but typeattribute
	# does not work in conditionals
	domain_obj_id_change_exemption($1)

	tunable_policy(`allow_kerberos',`
		allow $1 self:process setfscreate;

		selinux_validate_context($1)

		seutil_read_file_contexts($1)

		allow $1 krb5_host_rcache_t:file manage_file_perms;
		files_search_tmp($1)
	')
')

########################################
## <summary>
##	Connect to krb524 service
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`kerberos_connect_524',`
	tunable_policy(`allow_kerberos',`
		allow $1 self:udp_socket create_socket_perms;

                corenet_all_recvfrom_unlabeled($1)
		corenet_udp_sendrecv_generic_if($1)
		corenet_udp_sendrecv_all_nodes($1)
		corenet_udp_sendrecv_kerberos_master_port($1)
		corenet_sendrecv_kerberos_master_client_packets($1)
	')
')

########################################
## <summary>
##	All of the rules required to administrate 
##	an kerberos environment
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <param name="role">
##	<summary>
##	The role to be allowed to manage the kerberos domain.
##	</summary>
## </param>
## <rolecap/>
#
interface(`kerberos_admin',`
	gen_require(`
		type kadmind_t, krb5kdc_t, kerberos_initrc_exec_t;
		type kadmind_log_t, kadmind_tmp_t, kadmind_var_run_t;
		type krb5_conf_t, krb5_keytab_t, krb5kdc_conf_t;
		type krb5kdc_principal_t, krb5kdc_tmp_t;
		type krb5kdc_var_run_t, krb5_host_rcache_t;
		type kpropd_t;
	')

	allow $1 kadmind_t:process { ptrace signal_perms };
	ps_process_pattern($1, kadmind_t)

	allow $1 krb5kdc_t:process { ptrace signal_perms };
	ps_process_pattern($1, krb5kdc_t)

	allow $1 kpropd_t:process { ptrace signal_perms };
	ps_process_pattern($1, kpropd_t)

	init_labeled_script_domtrans($1, kerberos_initrc_exec_t)
	domain_system_change_exemption($1)
	role_transition $2 kerberos_initrc_exec_t system_r;
	allow $2 system_r;

	logging_list_logs($1)
	admin_pattern($1, kadmind_log_t)

	files_list_tmp($1)
	admin_pattern($1, kadmind_tmp_t)

	files_list_pids($1)
	admin_pattern($1, kadmind_var_run_t)

	admin_pattern($1, krb5_conf_t)

	admin_pattern($1, krb5_host_rcache_t)

	admin_pattern($1, krb5_keytab_t)

	admin_pattern($1, krb5kdc_principal_t)

	admin_pattern($1, krb5kdc_tmp_t)

	admin_pattern($1, krb5kdc_var_run_t)
')