# Macros for MTA domains.

#

#

# Author:   Russell Coker <russell@coker.com.au>

# Based on the work of: Stephen Smalley <sds@epoch.ncsc.mil>

#                       Timothy Fraser 

#

#

# mail_domain(domain_prefix)

#

# Define a derived domain for the sendmail program when executed by

# a user domain to send outgoing mail.  These domains are separate and

# independent of the domain used for the sendmail daemon process.

#

# The type declaration for the executable type for this program is

# provided separately in domains/program/mta.te. 

#

undefine(`mail_domain')

define(`mail_domain',`

# Derived domain based on the calling user domain and the program.

type $1_mail_t, domain, privlog, user_mail_domain, nscd_client_domain;

ifdef(`sendmail.te', `

sendmail_user_domain($1)

')

can_exec($1_mail_t, sendmail_exec_t)

allow $1_mail_t sendmail_exec_t:lnk_file { getattr read };

# The user role is authorized for this domain.

role $1_r types $1_mail_t;

uses_shlib($1_mail_t)

can_network_client_tcp($1_mail_t)

can_resolve($1_mail_t)

can_ypbind($1_mail_t)

allow $1_mail_t self:unix_dgram_socket create_socket_perms;

allow $1_mail_t self:unix_stream_socket create_socket_perms;

read_locale($1_mail_t)

read_sysctl($1_mail_t)

allow $1_mail_t device_t:dir search;

allow $1_mail_t { var_t var_spool_t }:dir search;

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

allow $1_mail_t sbin_t:dir search;

# It wants to check for nscd

dontaudit $1_mail_t var_run_t:dir search;

# Use capabilities

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

# Execute procmail.

can_exec($1_mail_t, bin_t)

ifdef(`procmail.te',`

can_exec($1_mail_t, procmail_exec_t)')

ifelse(`$1', `system', `

# Transition from a system domain to the derived domain.

domain_auto_trans(privmail, sendmail_exec_t, system_mail_t)

allow privmail sendmail_exec_t:lnk_file { getattr read };

ifdef(`crond.te', `

# Read cron temporary files.

allow system_mail_t system_crond_tmp_t:file { read getattr ioctl };

allow mta_user_agent system_crond_tmp_t:file { read getattr };

')

allow system_mail_t initrc_devpts_t:chr_file { read write getattr };

', `

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

can_tcp_connect($1_t, mail_server_domain)

# Transition from the user domain to the derived domain.

domain_auto_trans($1_t, sendmail_exec_t, $1_mail_t)

allow $1_t sendmail_exec_t:lnk_file { getattr read };

# 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;

')dnl end if postfix

allow mta_user_agent $1_tmp_t:file { read getattr };

# Write to the user domain tty.

access_terminal(mta_user_agent, $1)

access_terminal($1_mail_t, $1)

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

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

allow $1_mail_t privfd: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 (use_samba_home_dirs) {

rw_dir_create_file($1_mail_t, cifs_t)

}

# 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(mta_delivery_agent, $1_home_dir_t, $1_home_t)

')dnl end if system

allow $1_mail_t etc_t:file { getattr read };

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 if qmail

')