policy_module(mta, 2.3.0)

########################################

#

# 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)

files_read_usr_files(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)

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)

	cron_rw_system_job_stream_sockets(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

#

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)

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)

')

optional_policy(`

	dovecot_manage_spool(mailserver_delivery)

	dovecot_domtrans_deliver(mailserver_delivery)

')

optional_policy(`

	# so MTA can access /var/lib/mailman/mail/wrapper

	files_search_var_lib(mailserver_delivery)

	mailman_domtrans(mailserver_delivery)

	mailman_read_data_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)

')