selinux-policy/refpolicy/policy/modules/services/mta.if

# Copyright (C) 2005 Tresys Technology, LLC
## <module name="mta" layer="keyservices">
## <summary>Policy common to all email tranfer agents.</summary>

#######################################
#
# Per user domain template for this module
#
# mta_per_userdomain_template(userdomain_prefix)
#
define(`mta_per_userdomain_template',`
requires_block_template(`$0'_depend)

type $1_mail_t; # , user_mail_domain, nscd_client_domain;
domain_make_domain($1_mail_t)
role $1_r types $1_mail_t;

type $1_mail_tmp_t;
files_make_temporary_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 { sigkill sigstop signull signal setrlimit };

# tcp networking
allow $1_mail_t self:tcp_socket { create connect ioctl read getattr write setattr append bind getopt setopt shutdown };

# re-exec itself
allow $1_mail_t sendmail_exec_t:file { getattr read execute execute_no_trans };
allow $1_mail_t sendmail_exec_t:lnk_file { getattr read };

# Transition from the user domain to the derived domain.
allow $1_t sendmail_exec_t:file { getattr read execute execute_no_trans };
allow $1_t sendmail_exec_t:lnk_file { getattr read };
allow $1_t $1_mail_t:process transition;
type_transition $1_t sendmail_exec_t:process $1_mail_t;
allow $1_t $1_mail_t:fd use;
allow $1_mail_t $1_t:fd use;
allow $1_mail_t $1_t:fifo_file rw_file_perms;
allow $1_mail_t $1_t:process sigchld;

kernel_read_kernel_sysctl($1_mail_t)

corenetwork_network_tcp_on_all_interfaces($1_mail_t)
corenetwork_network_raw_on_all_interfaces($1_mail_t)
corenetwork_network_tcp_on_all_nodes($1_mail_t)
corenetwork_network_raw_on_all_nodes($1_mail_t)
corenetwork_network_tcp_on_all_ports($1_mail_t)
corenetwork_bind_tcp_on_all_nodes($1_mail_t)

domain_use_widely_inheritable_file_descriptors($1_mail_t)

libraries_use_dynamic_loader($1_mail_t)
libraries_use_shared_libraries($1_mail_t)

corecommands_execute_general_programs($1_mail_t)

files_read_general_system_config($1_mail_t)

logging_send_system_log_message($1_mail_t)

miscfiles_read_localization($1_mail_t)

sysnetwork_read_network_config($1_mail_t)

tunable_policy(`use_dns',`
allow $1_mail_t self:udp_socket { create ioctl read getattr write setattr append bind getopt setopt shutdown connect };
corenetwork_network_udp_on_all_interfaces($1_mail_t)
corenetwork_network_udp_on_all_nodes($1_mail_t)
corenetwork_bind_udp_on_all_nodes($1_mail_t)
corenetwork_network_udp_on_dns_port($1_mail_t)
')

optional_policy(`procmail.te',`
procmail_execute($1_mail_t)
')

ifdef(`TODO',`

can_ypbind($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 sbin_t:dir search;

# It wants to check for nscd
dontaudit $1_mail_t var_run_t:dir search;

# For when the user wants to send mail via port 25 localhost
can_tcp_connect($1_t, mail_server_domain)

# 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.
allow mta_user_agent $1_tty_device_t:chr_file { read write getattr ioctl };
allow mta_user_agent devpts_t:dir { read search getattr };
allow mta_user_agent $1_devpts_t:chr_file { read write getattr ioctl };

allow $1_mail_t $1_tty_device_t:chr_file { read write getattr ioctl };
allow $1_mail_t devpts_t:dir { read search getattr };
allow $1_mail_t $1_devpts_t:chr_file { read write getattr ioctl };

# 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 (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)

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

') dnl end TODO
')

define(`mta_per_userdomain_template_depend',`

')

#######################################
#
# mta_make_mailserver_domain(domain,entrypointtype)
#
define(`mta_make_mailserver_domain',`
requires_block_template(`$0'_depend)
init_make_daemon_domain($1,$2)
typeattribute $1 mailserver_domain;
')

define(`mta_make_mailserver_domain_depend',`
attribute mailserver_domain;
')

#######################################
#
# mta_make_sendmail_mailserver_domain(domain,entrypointtype)
#
define(`mta_make_sendmail_mailserver_domain',`
requires_block_template(`$0'_depend)
mta_make_mailserver_domain($1,sendmail_exec_t)
')

define(`mta_make_sendmail_mailserver_domain_depend',`
type sendmail_exec_t;
')

#######################################
#
# mta_send_mail(domain)
#
define(`mta_send_mail',`
requires_block_template(`$0'_depend)
allow $1 sendmail_exec_t:lnk_file { getattr read };
allow $1 sendmail_exec_t:file { getattr read execute };
allow $1 system_mail_t:process transition;
type_transition $1 sendmail_exec_t:process system_mail_t;
dontaudit $1 system_mail_t:process { noatsecure siginh rlimitinh };
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;
')

define(`mta_send_mail_depend',`
type system_mail_t, sendmail_exec_t;
class file { getattr read execute };
class lnk_file { getattr read };
class process { transition noatsecure siginh rlimitinh sigchld };
class fd use;
class fifo_file { ioctl read getattr lock write append };
')

#######################################
#
# mta_execute(domain)
#
define(`mta_execute',`
requires_block_template(`$0'_depend)
allow $1 sendmail_exec_t:file { getattr read execute execute_no_trans };
')

define(`mta_execute_depend',`
type sendmail_exec_t;
class file { getattr read execute execute_no_trans };
')

########################################
## <interface name="mta_read_mail_aliases">
##	<description>
##		Read mail address aliases.
##	</description>
##	<parameter name="domain">
##		The type of the process performing this action.
##	</parameter>
##	<infoflow type="read" weight="10"/>
## </interface>
#
define(`mta_read_mail_aliases',`
requires_block_template(`$0'_depend)
allow $1 etc_aliases_t:file { getattr read };
')

define(`mta_read_mail_aliases_depend',`
type etc_aliases_t;
class file { getattr read };
')

#######################################
#
# mta_modify_mail_aliases(domain)
#
define(`mta_modify_mail_aliases',`
requires_block_template(`$0'_depend)
allow sendmail_t etc_aliases_t:file { getattr read write append setattr };
')

define(`mta_modify_mail_aliases_depend',`
type etc_aliases_t;
class file { getattr read write append setattr };
')

#######################################
#
# mta_get_mail_spool_attributes(domain)
#
define(`mta_get_mail_spool_attributes',`
requires_block_template(`$0'_depend)
files_search_system_spool_directory($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;
')

define(`mta_get_mail_spool_attributes_depend',`
type mail_spool_t;
class dir r_dir_perms;
class file getattr;
class lnk_file read;
')

#######################################
#
# mta_modify_mail_spool(domain)
#
define(`mta_modify_mail_spool',`
requires_block_template(`$0'_depend)
files_search_system_spool_directory($1)
allow $1 mail_spool_t:dir { read getattr lock search ioctl add_name remove_name write };
allow $1 mail_spool_t:file { getattr read write append setattr };
')

define(`mta_modify_mail_spool_depend',`
type mail_spool_t;
class dir { read getattr lock search ioctl add_name remove_name write };
class file { create ioctl read getattr lock write setattr append link unlink rename };
')

#######################################
#
# mta_manage_mail_spool(domain)
#
define(`mta_manage_mail_spool',`
requires_block_template(`$0'_depend)
files_search_system_spool_directory($1)
allow $1 mail_spool_t:dir { read getattr lock search ioctl add_name remove_name write };
allow $1 mail_spool_t:file { create ioctl read getattr lock write setattr append link unlink rename };
')

define(`mta_manage_mail_spool_depend',`
type mail_spool_t;
class dir { read getattr lock search ioctl add_name remove_name write };
class file { create ioctl read getattr lock write setattr append link unlink rename };
')

#######################################
#
# mta_manage_mail_queue(domain)
#
define(`mta_manage_mail_queue',`
requires_block_template(`$0'_depend)
allow $1 mqueue_spool_t:dir { read getattr lock search ioctl add_name remove_name write };
allow $1 mqueue_spool_t:file { create ioctl read getattr lock write setattr append link unlink rename };
')

define(`mta_manage_mail_queue_depend',`
type mqueue_spool_t;
class dir { read getattr lock search ioctl add_name remove_name write };
class file { create ioctl read getattr lock write setattr append link unlink rename }
')

## </module>