debian-selinux-policies/policy/modules/mta.te

policy_module(mta, 2.8.5)

########################################
#
# 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;

attribute_role user_mail_roles;

type etc_aliases_t;
files_type(etc_aliases_t)

type etc_mail_t;
files_config_file(etc_mail_t)

type mail_home_t alias mail_forward_t;
userdom_user_home_content(mail_home_t)

type mail_home_rw_t;
userdom_user_home_content(mail_home_rw_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 };
userdom_user_application_type(user_mail_t)
role user_mail_roles types user_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 };
userdom_user_tmp_file(user_mail_tmp_t)

########################################
#
# Common base mail policy
#

allow user_mail_domain self:capability { setuid setgid chown };
allow user_mail_domain self:process { signal_perms setrlimit };
allow user_mail_domain self:fifo_file rw_fifo_file_perms;

allow user_mail_domain mta_exec_type:file entrypoint;

allow user_mail_domain mail_home_t:file { append_file_perms read_file_perms };

manage_dirs_pattern(user_mail_domain, mail_home_rw_t, mail_home_rw_t)
manage_files_pattern(user_mail_domain, mail_home_rw_t, mail_home_rw_t)
manage_lnk_files_pattern(user_mail_domain, mail_home_rw_t, mail_home_rw_t)
userdom_user_home_dir_filetrans(user_mail_domain, mail_home_rw_t, dir, "Maildir")
userdom_user_home_dir_filetrans(user_mail_domain, mail_home_rw_t, dir, ".maildir")

read_files_pattern(user_mail_domain, { etc_mail_t etc_aliases_t }, { etc_mail_t etc_aliases_t })

manage_files_pattern(user_mail_domain, { mqueue_spool_t mail_spool_t }, { mqueue_spool_t mail_spool_t })
read_lnk_files_pattern(user_mail_domain, { mqueue_spool_t mail_spool_t }, { mqueue_spool_t mail_spool_t })

allow user_mail_domain sendmail_exec_t:lnk_file read_lnk_file_perms;

can_exec(user_mail_domain, { mta_exec_type sendmail_exec_t })

kernel_read_crypto_sysctls(user_mail_domain)
kernel_read_system_state(user_mail_domain)
kernel_read_kernel_sysctls(user_mail_domain)
kernel_read_network_state(user_mail_domain)
kernel_request_load_module(user_mail_domain)

corenet_all_recvfrom_netlabel(user_mail_domain)
corenet_tcp_sendrecv_generic_if(user_mail_domain)
corenet_tcp_sendrecv_generic_node(user_mail_domain)

corenet_sendrecv_all_client_packets(user_mail_domain)
corenet_tcp_connect_all_ports(user_mail_domain)
corenet_tcp_sendrecv_all_ports(user_mail_domain)

corecmd_exec_bin(user_mail_domain)

dev_read_urand(user_mail_domain)

domain_use_interactive_fds(user_mail_domain)

files_read_etc_runtime_files(user_mail_domain)
files_read_usr_files(user_mail_domain)
files_search_spool(user_mail_domain)
files_dontaudit_search_pids(user_mail_domain)

fs_getattr_all_fs(user_mail_domain)

init_dontaudit_rw_utmp(user_mail_domain)

logging_send_syslog_msg(user_mail_domain)

miscfiles_read_localization(user_mail_domain)

tunable_policy(`use_samba_home_dirs',`
	fs_manage_cifs_dirs(user_mail_domain)
	fs_manage_cifs_files(user_mail_domain)
	fs_read_cifs_symlinks(user_mail_domain)
')

tunable_policy(`use_nfs_home_dirs',`
	fs_manage_nfs_dirs(user_mail_domain)
	fs_manage_nfs_files(user_mail_domain)
	fs_read_nfs_symlinks(user_mail_domain)
')

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

optional_policy(`
	exim_domtrans(user_mail_domain)
	exim_manage_log(user_mail_domain)
	exim_manage_spool_files(user_mail_domain)
	exim_read_var_lib_files(user_mail_domain)
')

optional_policy(`
	files_getattr_tmp_dirs(user_mail_domain)

	postfix_exec_master(user_mail_domain)
	postfix_read_config(user_mail_domain)
	postfix_search_spool(user_mail_domain)
	postfix_rw_inherited_master_pipes(user_mail_domain)

	ifdef(`distro_redhat',`
		postfix_config_filetrans(user_mail_domain, etc_aliases_t, { dir file lnk_file sock_file fifo_file })
	')
')

optional_policy(`
	procmail_exec(user_mail_domain)
')

optional_policy(`
	qmail_domtrans_inject(user_mail_domain)
')

optional_policy(`
	sendmail_manage_log(user_mail_domain)
	sendmail_log_filetrans_sendmail_log(user_mail_domain, file)
')

optional_policy(`
	uucp_manage_spool(user_mail_domain)
')

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

allow system_mail_t self:capability { dac_override fowner };

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_home_t:file manage_file_perms;
userdom_user_home_dir_filetrans(system_mail_t, mail_home_t, file, ".esmtp_queue")
userdom_user_home_dir_filetrans(system_mail_t, mail_home_t, file, ".forward")
userdom_user_home_dir_filetrans(system_mail_t, mail_home_t, file, ".mailrc")
userdom_user_home_dir_filetrans(system_mail_t, mail_home_t, file, "dead.letter")

allow system_mail_t user_mail_domain:dir list_dir_perms;
allow system_mail_t user_mail_domain:file read_file_perms;
allow system_mail_t user_mail_domain:lnk_file read_lnk_file_perms;

corecmd_exec_shell(system_mail_t)

dev_read_rand(system_mail_t)
dev_read_sysfs(system_mail_t)

fs_rw_anon_inodefs_files(system_mail_t)

selinux_getattr_fs(system_mail_t)

term_dontaudit_use_unallocated_ttys(system_mail_t)

init_use_script_ptys(system_mail_t)

userdom_use_user_terminals(system_mail_t)

optional_policy(`
	gen_require(`
		type crond_tmp_t;
	')
	allow system_mail_t crond_tmp_t:file write;
')

optional_policy(`
	apache_read_squirrelmail_data(system_mail_t)
	apache_append_squirrelmail_data(system_mail_t)
	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(`
        phpfpm_dontaudit_rw_stream_sockets(system_mail_t)
        phpfpm_dontaudit_rw_tcp_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(`
	bugzilla_search_content(system_mail_t)
	bugzilla_dontaudit_rw_stream_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)
	cron_rw_system_job_stream_sockets(system_mail_t)
')

optional_policy(`
	courier_stream_connect_authdaemon(system_mail_t)
')

optional_policy(`
	cvs_read_data(system_mail_t)
')

optional_policy(`
	fail2ban_dontaudit_rw_stream_sockets(system_mail_t)
	fail2ban_append_log(system_mail_t)
	fail2ban_rw_inherited_tmp_files(system_mail_t)
')

optional_policy(`
	logrotate_read_tmp_files(system_mail_t)
')

optional_policy(`
	logwatch_read_tmp_files(system_mail_t)
')

optional_policy(`
	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 })
')

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(`
	spamassassin_stream_connect_spamd(system_mail_t)
')

optional_policy(`
	smartmon_read_tmp_files(system_mail_t)
')

########################################
#
# MTA user agent local policy
#

userdom_use_user_terminals(mta_user_agent)

optional_policy(`
	apache_append_log(mta_user_agent)
')

optional_policy(`
	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
#

allow mailserver_delivery self:fifo_file rw_fifo_file_perms;

allow mailserver_delivery mail_spool_t:dir list_dir_perms;
create_files_pattern(mailserver_delivery, mail_spool_t, mail_spool_t)
read_files_pattern(mailserver_delivery, mail_spool_t, mail_spool_t)
append_files_pattern(mailserver_delivery, mail_spool_t, mail_spool_t)
create_lnk_files_pattern(mailserver_delivery, mail_spool_t, mail_spool_t)
read_lnk_files_pattern(mailserver_delivery, mail_spool_t, mail_spool_t)

manage_dirs_pattern(mailserver_delivery, mail_home_rw_t, mail_home_rw_t)
manage_files_pattern(mailserver_delivery, { mail_home_t mail_home_rw_t }, { mail_home_t mail_home_rw_t })
manage_lnk_files_pattern(mailserver_delivery, mail_home_rw_t, mail_home_rw_t)
userdom_user_home_dir_filetrans(mailserver_delivery, mail_home_t, file, ".esmtp_queue")
userdom_user_home_dir_filetrans(mailserver_delivery, mail_home_t, file, ".forward")
userdom_user_home_dir_filetrans(mailserver_delivery, mail_home_t, file, ".mailrc")
userdom_user_home_dir_filetrans(mailserver_delivery, mail_home_t, file, "dead.letter")
userdom_user_home_dir_filetrans(mailserver_delivery, mail_home_rw_t, dir, "Maildir")
userdom_user_home_dir_filetrans(mailserver_delivery, mail_home_rw_t, dir, ".maildir")

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_read_cifs_symlinks(mailserver_delivery)
')

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

optional_policy(`
	arpwatch_search_data(mailserver_delivery)
')

optional_policy(`
	dovecot_manage_spool(mailserver_delivery)
	dovecot_domtrans_deliver(mailserver_delivery)
')

optional_policy(`
	files_search_var_lib(mailserver_delivery)

	mailman_domtrans(mailserver_delivery)
	mailman_read_data_symlinks(mailserver_delivery)
')

optional_policy(`
	postfix_rw_inherited_master_pipes(mailserver_delivery)
')

optional_policy(`
	uucp_domtrans_uux(mailserver_delivery)
')

########################################
#
# User local policy
#

manage_files_pattern(user_mail_t, mail_home_t, mail_home_t)
userdom_user_home_dir_filetrans(user_mail_t, mail_home_t, file, ".esmtp_queue")
userdom_user_home_dir_filetrans(user_mail_t, mail_home_t, file, ".forward")
userdom_user_home_dir_filetrans(user_mail_t, mail_home_t, file, ".mailrc")
userdom_user_home_dir_filetrans(user_mail_t, mail_home_t, file, "dead.letter")

dev_read_sysfs(user_mail_t)

userdom_use_user_terminals(user_mail_t)

mta_manage_aliases(user_mail_t)

optional_policy(`
	allow user_mail_t self:capability dac_override;

	userdom_rw_user_tmp_files(user_mail_t)

	postfix_read_config(user_mail_t)
	postfix_list_spool(user_mail_t)
')