selinux-policy/refpolicy/policy/modules/services/mta.if

## <module name="mta" layer="keyservices">
## <summary>Policy common to all email tranfer agents.</summary>

#######################################
#
# Per user domain template for this module
#
# mta_per_userdomain_template(userdomain_prefix)
#
define(`mta_per_userdomain_template',`
	requires_block_template(`$0'_depend)

	type $1_mail_t; # , user_mail_domain, nscd_client_domain;
	domain_make_domain($1_mail_t)
	role $1_r types $1_mail_t;

	type $1_mail_tmp_t;
	files_make_temporary_file($1_mail_tmp_t)

	##############################
	#
	# $1_mail_t local policy
	#

	allow $1_mail_t self:capability { setuid setgid chown };
	allow $1_mail_t self:process { signal_perms setrlimit };

	# tcp networking
	allow $1_mail_t self:tcp_socket create_socket_perms;

	# re-exec itself
	can_exec($1_mail_t, sendmail_exec_t)
	allow $1_mail_t sendmail_exec_t:lnk_file r_file_perms;

	# Transition from the user domain to the derived domain.
	can_exec($1_t, sendmail_exec_t)
	domain_auto_trans($1_t, sendmail_exec_t, $1_mail_t)

	allow $1_t $1_mail_t:fd use;
	allow $1_mail_t $1_t:fd use;
	allow $1_mail_t $1_t:fifo_file rw_file_perms;
	allow $1_mail_t $1_t:process sigchld;

	kernel_read_kernel_sysctl($1_mail_t)

	corenetwork_sendrecv_tcp_on_all_interfaces($1_mail_t)
	corenetwork_sendrecv_raw_on_all_interfaces($1_mail_t)
	corenetwork_sendrecv_tcp_on_all_nodes($1_mail_t)
	corenetwork_sendrecv_raw_on_all_nodes($1_mail_t)
	corenetwork_sendrecv_tcp_on_all_ports($1_mail_t)
	corenetwork_bind_tcp_on_all_nodes($1_mail_t)

	domain_use_widely_inheritable_file_descriptors($1_mail_t)

	libraries_use_dynamic_loader($1_mail_t)
	libraries_use_shared_libraries($1_mail_t)

	corecommands_execute_general_programs($1_mail_t)

	files_read_general_system_config($1_mail_t)

	logging_send_system_log_message($1_mail_t)

	miscfiles_read_localization($1_mail_t)

	sysnetwork_read_network_config($1_mail_t)

	tunable_policy(`use_dns',`
		allow $1_mail_t self:udp_socket create_socket_perms;
		corenetwork_sendrecv_udp_on_all_interfaces($1_mail_t)
		corenetwork_sendrecv_udp_on_all_nodes($1_mail_t)
		corenetwork_bind_udp_on_all_nodes($1_mail_t)
		corenetwork_sendrecv_udp_on_dns_port($1_mail_t)
	')

	optional_policy(`procmail.te',`
		procmail_execute($1_mail_t)
	')

	ifdef(`TODO',`

	can_ypbind($1_mail_t)

	allow $1_mail_t device_t:dir search;
	allow $1_mail_t { var_t var_spool_t }:dir search;
	allow $1_mail_t sbin_t:dir search;

	# It wants to check for nscd
	dontaudit $1_mail_t var_run_t:dir search;

	# For when the user wants to send mail via port 25 localhost
	can_tcp_connect($1_t, mail_server_domain)

	# Read user temporary files.
	allow $1_mail_t $1_tmp_t:file r_file_perms;
	dontaudit $1_mail_t $1_tmp_t:file append;
	ifdef(`postfix.te', `
		# postfix seems to need write access if the file handle is opened read/write
		allow $1_mail_t $1_tmp_t:file write;
	')

	allow mta_user_agent $1_tmp_t:file r_file_perms;

	# Write to the user domain tty.
	allow mta_user_agent $1_tty_device_t:chr_file rw_file_perms;
	allow mta_user_agent devpts_t:dir r_dir_perms;
	allow mta_user_agent $1_devpts_t:chr_file rw_file_perms;

	allow $1_mail_t $1_tty_device_t:chr_file rw_file_perms;
	allow $1_mail_t devpts_t:dir r_dir_perms;
	allow $1_mail_t $1_devpts_t:chr_file rw_file_perms;

	# Inherit and use descriptors from gnome-pty-helper.
	ifdef(`gnome-pty-helper.te', `allow $1_mail_t $1_gph_t:fd use;')

	# Create dead.letter in user home directories.
	file_type_auto_trans($1_mail_t, $1_home_dir_t, $1_home_t, file)

	if (use_samba_home_dirs) {
		rw_dir_create_file($1_mail_t, cifs_t)
	}

	# if you do not want to allow dead.letter then use the following instead
	#allow $1_mail_t { $1_home_dir_t $1_home_t }:dir r_dir_perms;
	#allow $1_mail_t $1_home_t:file r_file_perms;

	# for reading .forward - maybe we need a new type for it?
	# also for delivering mail to maildir
	file_type_auto_trans(mta_delivery_agent, $1_home_dir_t, $1_home_t)

	ifdef(`qmail.te', `
		allow $1_mail_t qmail_etc_t:dir search;
		allow $1_mail_t qmail_etc_t:{ file lnk_file } read;
	')

	') dnl end TODO
')

define(`mta_per_userdomain_template_depend',`

')

#######################################
#
# mta_make_mailserver_domain(domain,entrypointtype)
#
define(`mta_make_mailserver_domain',`
	requires_block_template(`$0'_depend)

	init_make_daemon_domain($1,$2)
	typeattribute $1 mailserver_domain;
')

define(`mta_make_mailserver_domain_depend',`
	attribute mailserver_domain;
')

#######################################
#
# mta_make_sendmail_mailserver_domain(domain,entrypointtype)
#
define(`mta_make_sendmail_mailserver_domain',`
	requires_block_template(`$0'_depend)

	mta_make_mailserver_domain($1,sendmail_exec_t)
')

define(`mta_make_sendmail_mailserver_domain_depend',`
	type sendmail_exec_t;
')

#######################################
#
# mta_send_mail(domain)
#
define(`mta_send_mail',`
	requires_block_template(`$0'_depend)

	allow $1 sendmail_exec_t:lnk_file r_file_perms;
	domain_auto_trans($1, sendmail_exec_t, system_mail_t)

	allow $1 system_mail_t:fd use;
	allow system_mail_t $1:fd use;
	allow system_mail_t $1:fifo_file rw_file_perms;
	allow system_mail_t $1:process sigchld;
')

define(`mta_send_mail_depend',`
	type system_mail_t, sendmail_exec_t;

	class file { getattr read execute };
	class lnk_file r_file_perms;
	class process { transition noatsecure siginh rlimitinh sigchld };
	class fd use;
	class fifo_file rw_file_perms;
')

#######################################
#
# mta_execute(domain)
#
define(`mta_execute',`
	requires_block_template(`$0'_depend)

	can_exec($1, sendmail_exec_t)
')

define(`mta_execute_depend',`
	type sendmail_exec_t;

	class file { getattr read execute execute_no_trans };
')

########################################
## <interface name="mta_read_mail_aliases">
##	<description>
##		Read mail address aliases.
##	</description>
##	<parameter name="domain">
##		The type of the process performing this action.
##	</parameter>
## </interface>
#
define(`mta_read_mail_aliases',`
	requires_block_template(`$0'_depend)

	allow $1 etc_aliases_t:file r_file_perms;
')

define(`mta_read_mail_aliases_depend',`
	type etc_aliases_t;

	class file r_file_perms;
')

#######################################
#
# mta_modify_mail_aliases(domain)
#
define(`mta_modify_mail_aliases',`
	requires_block_template(`$0'_depend)

	allow sendmail_t etc_aliases_t:file { rw_file_perms setattr };
')

define(`mta_modify_mail_aliases_depend',`
	type etc_aliases_t;

	class file { rw_file_perms setattr };
')

#######################################
#
# mta_get_mail_spool_attributes(domain)
#
define(`mta_get_mail_spool_attributes',`
	requires_block_template(`$0'_depend)

	files_search_system_spool_directory($1)
	allow $1 mail_spool_t:dir r_dir_perms;
	allow $1 mail_spool_t:lnk_file read;
	allow $1 mail_spool_t:file getattr;
')

define(`mta_get_mail_spool_attributes_depend',`
	type mail_spool_t;

	class dir r_dir_perms;
	class file getattr;
	class lnk_file read;
')

#######################################
#
# mta_modify_mail_spool(domain)
#
define(`mta_modify_mail_spool',`
	requires_block_template(`$0'_depend)

	files_search_system_spool_directory($1)
	allow $1 mail_spool_t:dir rw_dir_perms;
	allow $1 mail_spool_t:file { rw_file_perms setattr };
')

define(`mta_modify_mail_spool_depend',`
	type mail_spool_t;

	class dir rw_dir_perms;
	class file { rw_file_perms setattr };
')

#######################################
#
# mta_manage_mail_spool(domain)
#
define(`mta_manage_mail_spool',`
	requires_block_template(`$0'_depend)

	files_search_system_spool_directory($1)
	allow $1 mail_spool_t:dir rw_dir_perms;
	allow $1 mail_spool_t:file create_file_perms;
')

define(`mta_manage_mail_spool_depend',`
	type mail_spool_t;

	class dir rw_dir_perms;
	class file create_file_perms;
')

#######################################
#
# mta_manage_mail_queue(domain)
#
define(`mta_manage_mail_queue',`
	requires_block_template(`$0'_depend)

	allow $1 mqueue_spool_t:dir rw_dir_perms;
	allow $1 mqueue_spool_t:file create_file_perms;
')

define(`mta_manage_mail_queue_depend',`
	type mqueue_spool_t;

	class dir rw_dir_perms;
	class file create_file_perms;
')

## </module>