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

policy_module(mta, 2.2.1)

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

attribute mailcontent_type;
attribute mta_exec_type;
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 mail_forward_t;
files_type(mail_forward_t)

type mqueue_spool_t;
files_mountpoint(mqueue_spool_t)

type mail_spool_t;
files_mountpoint(mail_spool_t)

type sendmail_exec_t;
mta_agent_executable(sendmail_exec_t)

mta_base_mail_template(system)
role system_r types system_mail_t;

mta_base_mail_template(user)
typealias user_mail_t alias { staff_mail_t sysadm_mail_t };
typealias user_mail_t alias { auditadm_mail_t secadm_mail_t };
typealias user_mail_tmp_t alias { staff_mail_tmp_t sysadm_mail_tmp_t };
typealias user_mail_tmp_t alias { auditadm_mail_tmp_t secadm_mail_tmp_t };
ubac_constrained(user_mail_t)
ubac_constrained(user_mail_tmp_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 fowner };
allow system_mail_t self:fifo_file rw_fifo_file_perms;

read_files_pattern(system_mail_t, etc_mail_t, etc_mail_t)

read_files_pattern(system_mail_t, mailcontent_type, mailcontent_type)

allow system_mail_t mail_forward_t:file read_file_perms;

allow system_mail_t mta_exec_type:file entrypoint;

can_exec(system_mail_t, mta_exec_type)

kernel_read_system_state(system_mail_t)
kernel_read_network_state(system_mail_t)
kernel_request_load_module(system_mail_t)

dev_read_sysfs(system_mail_t)
dev_read_rand(system_mail_t)
dev_read_urand(system_mail_t)

fs_rw_anon_inodefs_files(system_mail_t)

selinux_getattr_fs(system_mail_t)

init_use_script_ptys(system_mail_t)

userdom_use_user_terminals(system_mail_t)
userdom_dontaudit_search_user_home_dirs(system_mail_t)

optional_policy(`
	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_manage_tmp_files(system_mail_t)

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

optional_policy(`
	clamav_stream_connect(system_mail_t)
	clamav_append_log(system_mail_t)
')

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

optional_policy(`
	courier_manage_spool_dirs(system_mail_t)
	courier_manage_spool_files(system_mail_t)
	courier_rw_spool_pipes(system_mail_t)
')

optional_policy(`
	cvs_read_data(system_mail_t)
')

optional_policy(`
	exim_domtrans(system_mail_t)
	exim_manage_log(system_mail_t)
')

optional_policy(`
	fail2ban_append_log(system_mail_t)
')

optional_policy(`
	logrotate_read_tmp_files(system_mail_t)
')

optional_policy(`
	logwatch_read_tmp_files(system_mail_t)
')

optional_policy(`
	# newaliases runs as system_mail_t when the sendmail initscript does a restart
	milter_getattr_all_sockets(system_mail_t)
')

optional_policy(`
	nagios_read_tmp_files(system_mail_t)
')

optional_policy(`
	manage_dirs_pattern(system_mail_t, etc_aliases_t, etc_aliases_t)
	manage_files_pattern(system_mail_t, etc_aliases_t, etc_aliases_t)
	manage_lnk_files_pattern(system_mail_t, etc_aliases_t, etc_aliases_t)
	manage_fifo_files_pattern(system_mail_t, etc_aliases_t, etc_aliases_t)
	manage_sock_files_pattern(system_mail_t, etc_aliases_t, etc_aliases_t)
	files_etc_filetrans(system_mail_t, etc_aliases_t, { file lnk_file sock_file fifo_file })

	domain_use_interactive_fds(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_config_filetrans(system_mail_t, etc_aliases_t, { dir file lnk_file sock_file fifo_file })
	')
')

optional_policy(`
	qmail_domtrans_inject(system_mail_t)
')

optional_policy(`
	sxid_read_log(system_mail_t)
')

optional_policy(`
	userdom_dontaudit_use_user_ptys(system_mail_t)

	optional_policy(`
		cron_dontaudit_append_system_job_tmp_files(system_mail_t)
	')
')

optional_policy(`
	smartmon_read_tmp_files(system_mail_t)
')

# should break this up among sections:

optional_policy(`
	# 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_read_system_job_tmp_files(mta_user_agent)
	')
')

########################################
#
# Mailserver delivery local policy
#

read_files_pattern(mailserver_delivery, mail_forward_t, mail_forward_t)

read_files_pattern(mailserver_delivery, system_mail_tmp_t, system_mail_tmp_t)

tunable_policy(`use_samba_home_dirs',`
	fs_manage_cifs_dirs(mailserver_delivery)
	fs_manage_cifs_files(mailserver_delivery)
	fs_manage_cifs_symlinks(mailserver_delivery)
')

tunable_policy(`use_nfs_home_dirs',`
	fs_manage_nfs_dirs(mailserver_delivery)
	fs_manage_nfs_files(mailserver_delivery)
	fs_manage_nfs_symlinks(mailserver_delivery)
')

########################################
#
# User send mail local policy
#

domain_use_interactive_fds(user_mail_t)

userdom_use_user_terminals(user_mail_t)
# Write to the user domain tty. cjp: why?
userdom_use_user_terminals(mta_user_agent)
# Create dead.letter in user home directories.
userdom_manage_user_home_content_files(user_mail_t)
userdom_user_home_dir_filetrans_user_home_content(user_mail_t, file)
# for reading .forward - maybe we need a new type for it?
# also for delivering mail to maildir
userdom_manage_user_home_content_dirs(mailserver_delivery)
userdom_manage_user_home_content_files(mailserver_delivery)
userdom_manage_user_home_content_symlinks(mailserver_delivery)
userdom_manage_user_home_content_pipes(mailserver_delivery)
userdom_manage_user_home_content_sockets(mailserver_delivery)
userdom_user_home_dir_filetrans_user_home_content(mailserver_delivery, { dir file lnk_file fifo_file sock_file })
# Read user temporary files.
userdom_read_user_tmp_files(user_mail_t)
userdom_dontaudit_append_user_tmp_files(user_mail_t)
# cjp: this should probably be read all user tmp
# files in an appropriate place for mta_user_agent
userdom_read_user_tmp_files(mta_user_agent)

tunable_policy(`use_samba_home_dirs',`
	fs_manage_cifs_files(user_mail_t)
	fs_manage_cifs_symlinks(user_mail_t)
')

optional_policy(`
	allow user_mail_t self:capability dac_override;

	# Read user temporary files.
	# postfix seems to need write access if the file handle is opened read/write
	userdom_rw_user_tmp_files(user_mail_t)

	postfix_read_config(user_mail_t)
	postfix_list_spool(user_mail_t)
')