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

policy_module(mta,1.0.1)

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

attribute mta_user_agent;
attribute mailserver_delivery;
attribute mailserver_domain;
attribute mailserver_sender;

attribute user_mail_domain;

type etc_aliases_t;
files_type(etc_aliases_t)

type etc_mail_t;
files_config_file(etc_mail_t)

type mqueue_spool_t;
files_type(mqueue_spool_t)

type mail_spool_t;
files_type(mail_spool_t)

type sendmail_exec_t;
files_type(sendmail_exec_t)

type system_mail_t, user_mail_domain;
domain_type(system_mail_t)
domain_entry_file(system_mail_t,sendmail_exec_t)
role system_r types system_mail_t;

type system_mail_tmp_t;
files_tmp_file(system_mail_tmp_t)

# cjp: need to resolve this, but require{}
# does not work in the else part of the optional
#ifdef(`targeted_policy',`',`
#	optional_policy(`sendmail',`',`
#		init_system_domain(system_mail_t,sendmail_exec_t)
#	')
#')

########################################
#
# System mail local policy
#

allow system_mail_t self:capability { setuid setgid chown };
allow system_mail_t self:process { signal_perms setrlimit };
allow system_mail_t self:tcp_socket create_socket_perms;

allow system_mail_t etc_mail_t:dir { getattr search };
allow system_mail_t etc_mail_t:file r_file_perms;

# re-exec itself
can_exec(system_mail_t, sendmail_exec_t)
allow system_mail_t sendmail_exec_t:lnk_file r_file_perms;

allow system_mail_t system_mail_tmp_t:dir create_dir_perms;
allow system_mail_t system_mail_tmp_t:file create_file_perms;
files_create_tmp_files(system_mail_t, system_mail_tmp_t, { file dir })

kernel_read_kernel_sysctl(system_mail_t)
kernel_read_system_state(system_mail_t)
kernel_read_network_state(system_mail_t)

corenet_tcp_sendrecv_all_if(system_mail_t)
corenet_raw_sendrecv_all_if(system_mail_t)
corenet_tcp_sendrecv_all_nodes(system_mail_t)
corenet_raw_sendrecv_all_nodes(system_mail_t)
corenet_tcp_sendrecv_all_ports(system_mail_t)
corenet_tcp_bind_all_nodes(system_mail_t)
corenet_tcp_connect_smtp_port(system_mail_t)
corenet_tcp_connect_all_ports(system_mail_t)

dev_read_rand(system_mail_t)
dev_read_urand(system_mail_t)

fs_getattr_xattr_fs(system_mail_t)

init_use_script_pty(system_mail_t)

files_read_etc_files(system_mail_t)
files_read_etc_runtime_files(system_mail_t)
files_search_spool(system_mail_t)
# It wants to check for nscd
files_dontaudit_search_pids(system_mail_t)

corecmd_exec_bin(system_mail_t)
corecmd_search_sbin(system_mail_t)

libs_use_ld_so(system_mail_t)
libs_use_shared_libs(system_mail_t)

logging_send_syslog_msg(system_mail_t)

miscfiles_read_localization(system_mail_t)

sysnet_read_config(system_mail_t)
sysnet_dns_name_resolve(system_mail_t)

userdom_use_sysadm_terms(system_mail_t)

ifdef(`hide_broken_symptoms',`
	# Red Hat systems seem to have a stray
	# fds open from the initrd
	ifdef(`distro_redhat',`
		kernel_dontaudit_use_fd(system_mail_t)
		storage_dontaudit_read_fixed_disk(system_mail_t)
	')
')

ifdef(`targeted_policy',`
	typealias system_mail_t alias sysadm_mail_t;

	allow system_mail_t mail_spool_t:dir create_dir_perms;
	allow system_mail_t mail_spool_t:file create_file_perms;
	allow system_mail_t mail_spool_t:lnk_file create_lnk_perms;
	allow system_mail_t mail_spool_t:fifo_file rw_file_perms;

	allow system_mail_t mqueue_spool_t:dir create_dir_perms;
	allow system_mail_t mqueue_spool_t:file create_file_perms;
	allow system_mail_t mqueue_spool_t:lnk_file create_lnk_perms;

	# for reading .forward - maybe we need a new type for it?
	# also for delivering mail to maildir
	# cjp: fix this to generic_user interfaces
	userdom_manage_user_home_subdirs(user,mailserver_delivery)
	userdom_manage_user_home_subdir_files(user,mailserver_delivery)
	userdom_manage_user_home_subdir_symlinks(user,mailserver_delivery)
	userdom_manage_user_home_subdir_pipes(user,mailserver_delivery)
	userdom_manage_user_home_subdir_sockets(user,mailserver_delivery)
	userdom_create_user_home(user,mailserver_delivery,{ dir file lnk_file fifo_file sock_file })

# cjp: another require-in-else to resolve
#	optional_policy(`postfix',`',`
		corecmd_exec_bin(system_mail_t)
		corecmd_exec_sbin(system_mail_t)

		domain_exec_all_entry_files(system_mail_t)

		files_exec_etc_files(system_mail_t)

		libs_use_ld_so(system_mail_t)
		libs_use_shared_libs(system_mail_t)
		libs_exec_ld_so(system_mail_t)
		libs_exec_lib_files(system_mail_t)
#	')
')

optional_policy(`apache',`
	apache_read_squirrelmail_data(system_mail_t)
	apache_append_squirrelmail_data(system_mail_t)

	# apache should set close-on-exec
	apache_dontaudit_append_log(system_mail_t)
	apache_dontaudit_rw_stream_socket(system_mail_t)
	apache_dontaudit_rw_tcp_socket(system_mail_t)
	apache_dontaudit_rw_sys_script_stream_socket(system_mail_t)
')

optional_policy(`arpwatch',`
	arpwatch_rw_tmp_files(system_mail_t)
')

optional_policy(`cron',`
	cron_read_system_job_tmp_files(system_mail_t)
')

optional_policy(`cvs',`
	cvs_read_data(system_mail_t)
')

optional_policy(`logrotate',`
	logrotate_read_tmp_files(system_mail_t)
')

optional_policy(`nis',`
	nis_use_ypbind(system_mail_t)
')

optional_policy(`nscd',`
	nscd_use_socket(system_mail_t)
')

optional_policy(`postfix',`
	postfix_stub(system_mail_t)

	allow system_mail_t etc_aliases_t:dir create_dir_perms;
	allow system_mail_t etc_aliases_t:file create_file_perms;
	allow system_mail_t etc_aliases_t:lnk_file create_lnk_perms;
	allow system_mail_t etc_aliases_t:sock_file create_file_perms;
	allow system_mail_t etc_aliases_t:fifo_file create_file_perms;
	files_create_etc_config(system_mail_t,etc_aliases_t,{ file lnk_file sock_file fifo_file })

	domain_use_wide_inherit_fd(system_mail_t)

	optional_policy(`crond',`
		cron_crw_tcp_socket(system_mail_t)
	')

	allow mta_user_agent sysadm_t:fifo_file { read write };
	type_transition postfix_master_t postfix_etc_t:dir etc_aliases_t;
')

optional_policy(`procmail',`
	procmail_exec(system_mail_t)
')

optional_policy(`sendmail',`
	sendmail_stub(system_mail_t)

	allow system_mail_t etc_mail_t:dir { getattr search };

	# sendmail -q 
	allow system_mail_t mqueue_spool_t:dir rw_dir_perms;
	allow system_mail_t mqueue_spool_t:file create_file_perms;

	# FIXME:
	allow system_mail_t sendmail_log_t:file manage_file_perms;
	logging_create_log(system_mail_t,sendmail_log_t)
')

ifdef(`TODO',`
optional_policy(`sendmail',`
	allow system_mail_t { var_t var_spool_t }:dir getattr;
	dontaudit system_mail_t userpty_type:chr_file { getattr read write };

	optional_policy(`crond',`
		dontaudit system_mail_t system_crond_tmp_t:file append;
	')
')

ifdef(`targeted_policy',`
	allow system_mail_t { var_t var_spool_t }:dir getattr;
',`
	# allow the sysadmin to do "mail someone < /home/user/whatever"
	allow sysadm_mail_t user_home_dir_type:dir search;
	r_dir_file(sysadm_mail_t, user_home_type)
')


optional_policy(`qmail',`
	allow system_mail_t qmail_etc_t:dir search;
	allow system_mail_t qmail_etc_t:{ file lnk_file } read;
')
') dnl end TODO

allow mta_user_agent system_crond_tmp_t:file { read getattr };

optional_policy(`arpwatch',`
	# why is mail delivered to a directory of type arpwatch_data_t?
	arpwatch_search_data(mailserver_delivery)
	arpwatch_manage_tmp_files(system_mail_t)
	arpwatch_manage_tmp_files(mta_user_agent)
	ifdef(`hide_broken_symptoms', `
		arpwatch_dontaudit_rw_packet_socket(system_mail_t)
		arpwatch_dontaudit_rw_packet_socket(mta_user_agent)
	')
')