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

policy_module(mta,1.0)

########################################
#
# Declarations
#

attribute mta_user_agent;
attribute mailserver_delivery;
attribute mailserver_domain;
attribute mailserver_sender;

type etc_aliases_t;
files_type(etc_aliases_t)

type etc_mail_t;
files_type(etc_mail_t)

type mqueue_spool_t;
files_type(mqueue_spool_t)

type mail_spool_t;
files_type(mail_spool_t)

type sendmail_exec_t;
files_type(sendmail_exec_t)

type system_mail_t;
domain_type(system_mail_t)
role system_r types system_mail_t;

ifdef(`targeted_policy',`',`
	optional_policy(`sendmail.te',`
		domain_entry_file(system_mail_t,sendmail_exec_t)
	',`
		init_system_domain(system_mail_t,sendmail_exec_t)
	')
')

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

allow system_mail_t self:capability { setuid setgid chown };
allow system_mail_t self:process { signal_perms setrlimit };
allow system_mail_t self:tcp_socket create_socket_perms;

# re-exec itself
can_exec(system_mail_t, sendmail_exec_t)
allow system_mail_t sendmail_exec_t:lnk_file r_file_perms;

kernel_read_kernel_sysctl(system_mail_t)
kernel_read_system_state(system_mail_t)
kernel_read_network_state(system_mail_t)

corenet_tcp_sendrecv_all_if(system_mail_t)
corenet_raw_sendrecv_all_if(system_mail_t)
corenet_tcp_sendrecv_all_nodes(system_mail_t)
corenet_raw_sendrecv_all_nodes(system_mail_t)
corenet_tcp_sendrecv_all_ports(system_mail_t)
corenet_tcp_bind_all_nodes(system_mail_t)

dev_read_rand(system_mail_t)
dev_read_urand(system_mail_t)

fs_getattr_xattr_fs(system_mail_t)

init_use_script_pty(system_mail_t)

files_read_etc_files(system_mail_t)
files_read_etc_runtime_files(system_mail_t)
files_search_spool(system_mail_t)
# It wants to check for nscd
files_dontaudit_search_pids(system_mail_t)

corecmd_exec_bin(system_mail_t)
corecmd_search_sbin(system_mail_t)

libs_use_ld_so(system_mail_t)
libs_use_shared_libs(system_mail_t)

logging_send_syslog_msg(system_mail_t)

miscfiles_read_localization(system_mail_t)

sysnet_read_config(system_mail_t)
sysnet_dns_name_resolve(system_mail_t)

userdom_use_sysadm_terms(system_mail_t)

ifdef(`targeted_policy',`
	allow system_mail_t etc_mail_t:file r_file_perms;

	allow system_mail_t mail_spool_t:dir create_dir_perms;
	allow system_mail_t mail_spool_t:file create_file_perms;
	allow system_mail_t mail_spool_t:lnk_file create_lnk_perms;
	allow system_mail_t mail_spool_t:fifo_file rw_file_perms;

	allow system_mail_t mqueue_spool_t:dir create_dir_perms;
	allow system_mail_t mqueue_spool_t:file create_file_perms;
	allow system_mail_t mqueue_spool_t:lnk_file create_lnk_perms;

	optional_policy(`postfix.te',`',`
		corecmd_exec_bin(system_mail_t)
		corecmd_exec_sbin(system_mail_t)

		domain_exec_all_entry_files(system_mail_t)

		files_exec_etc_files(system_mail_t)

		libs_use_ld_so(system_mail_t)
		libs_use_shared_libs(system_mail_t)
		libs_exec_ld_so(system_mail_t)
		libs_exec_lib_files(system_mail_t)
	')
')

optional_policy(`cron.te',`
	cron_read_system_job_tmp_files(system_mail_t)
')

optional_policy(`logrotate.te',`
	logrotate_read_tmp_files(system_mail_t)
')

optional_policy(`nis.te',`
	nis_use_ypbind(system_mail_t)
')

optional_policy(`nscd.te',`
	nscd_use_socket(system_mail_t)
')

optional_policy(`procmail.te',`
	procmail_exec(system_mail_t)
')

optional_policy(`sendmail.te',`
	allow system_mail_t etc_mail_t:dir { getattr search };

	# sendmail -q 
	allow system_mail_t mqueue_spool_t:dir rw_dir_perms;
	allow system_mail_t mqueue_spool_t:file create_file_perms;
')

ifdef(`TODO',`
optional_policy(`sendmail.te',`
	allow system_mail_t { var_t var_spool_t }:dir getattr;
	dontaudit system_mail_t userpty_type:chr_file { getattr read write };

	optional_policy(`crond.te', `
		dontaudit system_mail_t system_crond_tmp_t:file append;
	')
')

ifdef(`targeted_policy',`
	allow system_mail_t { var_t var_spool_t }:dir getattr;
',`
	# allow the sysadmin to do "mail someone < /home/user/whatever"
	allow sysadm_mail_t user_home_dir_type:dir search;
	r_dir_file(sysadm_mail_t, user_home_type)
')

allow system_mail_t privmail:fd use;
allow system_mail_t privmail:process sigchld;
allow system_mail_t privmail:fifo_file { read write };

optional_policy(`qmail.te',`
	allow system_mail_t qmail_etc_t:dir search;
	allow system_mail_t qmail_etc_t:{ file lnk_file } read;
')
') dnl end TODO