## <summary>Policy common to all email tranfer agents.</summary>

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

## <summary>

##	MTA stub interface.  No access allowed.

## </summary>

## <param name="domain" optional="true">

##	N/A

## </param>

#

interface(`mta_stub',`

	gen_require(`

		type sendmail_exec_t;

	')

')

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

## <summary>

##	The per user domain template for the mta module.

## </summary>

## <desc>

##	

##	This template creates a derived domain which is

##	a email transfer agent, which sends mail on

##	behalf of the user.

##	

##	

##	This template is invoked automatically for each user, and

##	generally does not need to be invoked directly

##	by policy writers.

##	

## </desc>

## <param name="userdomain_prefix">

##	The prefix of the user domain (e.g., user

##	is the prefix for user_t).

## </param>

## <param name="user_domain">

##	The type of the user domain.

## </param>

## <param name="user_role">

##	The role associated with the user domain.

## </param>

#

template(`mta_per_userdomain_template',`

	gen_require(`

		attribute mailserver_domain, mta_user_agent;

		type sendmail_exec_t;

	')

	type $1_mail_t;

	domain_type($1_mail_t)

	role $3 types $1_mail_t;

	type $1_mail_tmp_t;

	files_tmp_file($1_mail_tmp_t)

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

	#

	# $1_mail_t local policy

	#

	allow $1_mail_t self:capability { setuid setgid chown };

	allow $1_mail_t self:process { signal_perms setrlimit };

	allow $1_mail_t self:tcp_socket create_socket_perms;

	# re-exec itself

	can_exec($1_mail_t, sendmail_exec_t)

	allow $1_mail_t sendmail_exec_t:lnk_file r_file_perms;

	# Transition from the user domain to the derived domain.

	domain_auto_trans($2, sendmail_exec_t, $1_mail_t)

	allow $2 sendmail_exec_t:lnk_file { getattr read };

	allow $2 $1_mail_t:fd use;

	allow $1_mail_t $2:fd use;

	allow $1_mail_t $2:fifo_file rw_file_perms;

	allow $1_mail_t $2:process sigchld;

	# For when the user wants to send mail via port 25 localhost

	kernel_tcp_recvfrom($2)

	allow $2 mailserver_domain:tcp_socket { connectto recvfrom };

	allow mailserver_domain $2:tcp_socket { acceptfrom recvfrom };

	kernel_read_kernel_sysctl($1_mail_t)

	corenet_tcp_sendrecv_all_if($1_mail_t)

	corenet_raw_sendrecv_all_if($1_mail_t)

	corenet_tcp_sendrecv_all_nodes($1_mail_t)

	corenet_raw_sendrecv_all_nodes($1_mail_t)

	corenet_tcp_sendrecv_all_ports($1_mail_t)

	corenet_tcp_bind_all_nodes($1_mail_t)

	corenet_tcp_connect_all_ports($1_mail_t)

	domain_use_wide_inherit_fd($1_mail_t)

	libs_use_ld_so($1_mail_t)

	libs_use_shared_libs($1_mail_t)

	corecmd_exec_bin($1_mail_t)

	corecmd_search_sbin($1_mail_t)

	files_read_etc_files($1_mail_t)

	files_search_spool($1_mail_t)

	# It wants to check for nscd

	files_dontaudit_search_pids($1_mail_t)

	logging_send_syslog_msg($1_mail_t)

	miscfiles_read_localization($1_mail_t)

	sysnet_read_config($1_mail_t)

	sysnet_dns_name_resolve($1_mail_t)

	userdom_use_user_terminals($1,$1_mail_t)

	# Write to the user domain tty. cjp: why?

	userdom_use_user_terminals($1,mta_user_agent)

	tunable_policy(`use_samba_home_dirs',`

		fs_manage_cifs_files($1_mail_t)

		fs_manage_cifs_symlinks($1_mail_t)

	')

	optional_policy(`nis.te',`

		nis_use_ypbind($1_mail_t)

	')

	optional_policy(`nscd.te',`

		nscd_use_socket($1_mail_t)

	')

	ifdef(`TODO',`

	optional_policy(`procmail.te',`

		procmail_execute($1_mail_t)

	')

	# Read user temporary files.

	allow $1_mail_t $1_tmp_t:file r_file_perms;

	dontaudit $1_mail_t $1_tmp_t:file append;

	ifdef(`postfix.te',`

		# postfix seems to need write access if the file handle is opened read/write

		allow $1_mail_t $1_tmp_t:file write;

	')

	# cjp: why?

	allow mta_user_agent $1_tmp_t:file r_file_perms;

	# Inherit and use descriptors from gnome-pty-helper.

	ifdef(`gnome-pty-helper.te', `allow $1_mail_t $1_gph_t:fd use;')

	# Create dead.letter in user home directories.

	file_type_auto_trans($1_mail_t, $1_home_dir_t, $1_home_t, file)

	# if you do not want to allow dead.letter then use the following instead

	#allow $1_mail_t { $1_home_dir_t $1_home_t }:dir r_dir_perms;

	#allow $1_mail_t $1_home_t:file r_file_perms;

	# for reading .forward - maybe we need a new type for it?

	# also for delivering mail to maildir

	file_type_auto_trans(mailserver_delivery, $1_home_dir_t, $1_home_t)

	ifdef(`qmail.te', `

		allow $1_mail_t qmail_etc_t:dir search;

		allow $1_mail_t qmail_etc_t:{ file lnk_file } read;

	')

	') dnl end TODO

')

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

#

# mta_mailserver(domain,entrypointtype)

#

interface(`mta_mailserver',`

	gen_require(`

		attribute mailserver_domain;

	')

	# For when the user wants to send mail via port 25 localhost

	kernel_tcp_recvfrom($1)

	init_daemon_domain($1,$2)

	typeattribute $1 mailserver_domain;

')

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

## <summary>

##	Modified mailserver interface for

##	sendmail daemon use.

## </summary>

## <desc>

##	

##	A modified MTA mail server interface for

##	the sendmail program.  It's design does

##	not fit well with policy, and using the

##	regular interface causes a type_transition

##	conflict if direct running of init scripts

##	is enabled.

##	

##	

##	This interface should most likely only be used

##	by the sendmail policy.

##	

## </desc>

## <param name="domain">

##	The type to be used for the mail server.

## </param>

## <param name="entry_point">

##	The type to be used for the domain entry point program.

## </param>

interface(`mta_sendmail_mailserver',`

	gen_require(`

		attribute mailserver_domain;

		type sendmail_exec_t;

	')

	# For when the user wants to send mail via port 25 localhost

	kernel_tcp_recvfrom($1)

	init_system_domain($1,sendmail_exec_t)

	typeattribute $1 mailserver_domain;

')

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

## <summary>

##	Make a type a mailserver type used

##	for sending mail.

## </summary>

## <param name="domain">

##	Mail server domain type used for sending mail.

## </param>

#

interface(`mta_mailserver_sender',`

	gen_require(`

		attribute mailserver_sender;

	')

	typeattribute $1 mailserver_sender;

')

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

## <summary>

##	Make a type a mailserver type used

##	for delivering mail to local users.

## </summary>

## <param name="domain">

##	Mail server domain type used for delivering mail.

## </param>

#

interface(`mta_mailserver_delivery',`

	gen_require(`

		attribute mailserver_delivery;

	')

	typeattribute $1 mailserver_delivery;

	optional_policy(`dovecot.te',`

		dovecot_manage_spool($1)

	')

	optional_policy(`mailman.te',`

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

		files_search_var_lib($1)

		mailman_domtrans($1)

		mailman_read_data_symlinks($1)

	')

')

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

## <summary>

##	Make a type a mailserver type used

##	for sending mail on behalf of local

##	users to the local mail spool.

## </summary>

## <param name="domain">

##	Mail server domain type used for sending local mail.

## </param>

#

interface(`mta_mailserver_user_agent',`

	gen_require(`

		attribute mta_user_agent;

	')

	typeattribute $1 mta_user_agent;

	optional_policy(`apache.te',`

		# apache should set close-on-exec

		apache_dontaudit_rw_stream_socket($1)

		apache_dontaudit_rw_sys_script_stream_socket($1)

	')

')

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

#

# mta_send_mail(domain)

#

interface(`mta_send_mail',`

	gen_require(`

		type system_mail_t, sendmail_exec_t;

		class lnk_file r_file_perms;

		class process sigchld;

		class fd use;

		class fifo_file rw_file_perms;

	')

	allow $1 sendmail_exec_t:lnk_file r_file_perms;

	domain_auto_trans($1, sendmail_exec_t, system_mail_t)

	allow $1 system_mail_t:fd use;

	allow system_mail_t $1:fd use;

	allow system_mail_t $1:fifo_file rw_file_perms;

	allow system_mail_t $1:process sigchld;

	ifdef(`TODO',`

	allow mta_user_agent $1:fd use;

	allow mta_user_agent $1:process sigchld;

	allow mta_user_agent $1:fifo_file { read write };

	')

')

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

#

# mta_exec(domain)

#

interface(`mta_exec',`

	gen_require(`

		type sendmail_exec_t;

	')

	can_exec($1, sendmail_exec_t)

')

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

## <summary>

##	Read mail address aliases.

## </summary>

## <param name="domain">

##	The type of the process performing this action.

## </param>

#

interface(`mta_read_aliases',`

	gen_require(`

		type etc_aliases_t;

		class file r_file_perms;

	')

	files_search_etc($1)

	allow $1 etc_aliases_t:file r_file_perms;

')

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

#

# mta_rw_aliases(domain)

#

interface(`mta_rw_aliases',`

	gen_require(`

		type etc_aliases_t;

		class file { rw_file_perms setattr };

	')

	files_search_etc($1)

	allow sendmail_t etc_aliases_t:file { rw_file_perms setattr };

')

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

## <summary>

##	Do not audit attempts to read and write TCP

##	sockets of mail delivery domains.

## </summary>

## <param name="domain">

##	Mail server domain.

## </param>

#

interface(`mta_dontaudit_rw_delivery_tcp_socket',`

	gen_require(`

		attribute mailserver_delivery;

	')

	dontaudit $1 mailserver_delivery:tcp_socket { read write };

')

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

## <summary>

##	Connect to all mail servers over TCP.

## </summary>

## <param name="domain">

##	Mail server domain.

## </param>

#

interface(`mta_tcp_connect_all_mailservers',`

	gen_require(`

		attribute mailserver_domain;

	')

	allow $1 mailserver_domain:tcp_socket { connectto recvfrom };

	allow mailserver_domain $1:tcp_socket { acceptfrom recvfrom };

	kernel_tcp_recvfrom($1)

')

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

## <summary>

##	Do not audit attempts to read a symlink

##	in the mail spool.

## </summary>

## <param name="domain">

##	Domain allowed access.

## </param>

#

interface(`mta_dontaudit_read_spool_symlink',`

	gen_require(`

		type mail_spool_t;

		class lnk_file read;

	')

	dontaudit $1 mail_spool_t:lnk_file read;

')

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

#

# mta_getattr_spool(domain)

#

interface(`mta_getattr_spool',`

	gen_require(`

		type mail_spool_t;

		class dir r_dir_perms;

		class file getattr;

		class lnk_file read;

	')

	files_search_spool($1)

	allow $1 mail_spool_t:dir r_dir_perms;

	allow $1 mail_spool_t:lnk_file read;

	allow $1 mail_spool_t:file getattr;

')

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

#

# mta_rw_spool(domain)

#

interface(`mta_rw_spool',`

	gen_require(`

		type mail_spool_t;

		class dir r_dir_perms;

		class lnk_file { getattr read };

		class file { rw_file_perms setattr };

	')

	files_search_spool($1)

	allow $1 mail_spool_t:dir r_dir_perms;

	allow $1 mail_spool_t:lnk_file { getattr read };

	allow $1 mail_spool_t:file { rw_file_perms setattr };

')

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

## <summary>

##	Create, read, and write the mail spool.

## </summary>

## <param name="domain">

##	Domain allowed access.

## </param>

#

interface(`mta_append_spool',`

	gen_require(`

		type mail_spool_t;

		class dir ra_dir_perms;

		class lnk_file { getattr read };

		class file create_file_perms;

	')

	files_search_spool($1)

	allow $1 mail_spool_t:dir ra_dir_perms;

	allow $1 mail_spool_t:lnk_file { getattr read };

	allow $1 mail_spool_t:file create_file_perms;

')

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

#

# mta_manage_spool(domain)

#

interface(`mta_manage_spool',`

	gen_require(`

		type mail_spool_t;

		class dir rw_dir_perms;

		class lnk_file { getattr read };

		class file create_file_perms;

	')

	files_search_spool($1)

	allow $1 mail_spool_t:dir rw_dir_perms;

	allow $1 mail_spool_t:lnk_file { getattr read };

	allow $1 mail_spool_t:file create_file_perms;

')

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

#

# mta_manage_queue(domain)

#

interface(`mta_manage_queue',`

	gen_require(`

		type mqueue_spool_t;

		class dir rw_dir_perms;

		class file create_file_perms;

	')

	files_search_spool($1)

	allow $1 mqueue_spool_t:dir rw_dir_perms;

	allow $1 mqueue_spool_t:file create_file_perms;

')