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

policy_module(mta,1.2.2)

########################################
#
# 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)

mta_base_mail_template(system)
role system_r types system_mail_t;

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

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

# newalias required this, not sure if it is needed in 'if' file
allow system_mail_t self:capability { dac_override };

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

kernel_read_system_state(system_mail_t)
kernel_read_network_state(system_mail_t)

dev_read_rand(system_mail_t)
dev_read_urand(system_mail_t)

fs_read_eventpollfs(system_mail_t)

init_use_script_ptys(system_mail_t)

userdom_use_sysadm_terms(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_filetrans_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_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_sockets(system_mail_t)
	apache_dontaudit_rw_tcp_sockets(system_mail_t)
	apache_dontaudit_rw_sys_script_stream_sockets(system_mail_t)
')

optional_policy(`arpwatch',`
	arpwatch_manage_tmp_files(system_mail_t)

	ifdef(`hide_broken_symptoms', `
		arpwatch_dontaudit_rw_packet_sockets(system_mail_t)
	')
')

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

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

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

optional_policy(`logwatch',`
	logwatch_read_tmp_files(system_mail_t)
')

optional_policy(`postfix',`
	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_filetrans_etc(system_mail_t,etc_aliases_t,{ file lnk_file sock_file fifo_file })

	domain_use_wide_inherit_fd(system_mail_t)

	# postfix needs this for newaliases
	files_getattr_tmp_dirs(system_mail_t)

	postfix_exec_master(system_mail_t)
	postfix_read_config(system_mail_t)
	postfix_search_spool(system_mail_t)

	ifdef(`distro_redhat',`
		# compatability for old default main.cf
		postfix_filetrans_config(system_mail_t,etc_aliases_t,{ dir file lnk_file sock_file fifo_file })
	')

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

optional_policy(`sendmail',`
	userdom_dontaudit_use_unpriv_users_ptys(system_mail_t)

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

optional_policy(`smartmon',`
	smartmon_read_tmp_files(system_mail_t)
')

# should break this up among sections:

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

ifdef(`TODO',`
# for the start script to run make -C /etc/mail
allow initrc_t etc_mail_t:dir rw_dir_perms;
allow initrc_t etc_mail_t:file create_file_perms;
')