[exim-config] / base.m4

### -*-m4-*-
###
### Basic settings for distorted.org.uk Exim configuration
###
### (c) 2012 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This program is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

###--------------------------------------------------------------------------
### Global settings.

SECTION(global, priv)m4_dnl
admin_groups = CONF_admin_groups
trusted_groups = CONF_trusted_groups
prod_requires_admin = false

SECTION(global, logging)m4_dnl
log_file_path = : syslog
log_selector = \
	+smtp_confirmation \
	+tls_peerdn
log_timezone = true
syslog_duplication = false
syslog_timestamp = false

SECTION(global, daemon)m4_dnl
local_interfaces = <; CONF_interfaces
extra_local_interfaces = <; 0.0.0.0 ; ::0

SECTION(global, resource)m4_dnl
deliver_queue_load_max = 8
queue_only_load = 12
smtp_accept_max = 16
smtp_accept_queue = 32
smtp_accept_reserve = 4
smtp_load_reserve = 10
smtp_reserve_hosts = +trusted

SECTION(global, policy)m4_dnl
host_lookup = *

SECTION(global, users)m4_dnl
gecos_name = $1
gecos_pattern = ([^,:]*)

SECTION(global, incoming)m4_dnl
received_header_text = Received: \
	${if def:sender_rcvhost \
	     {from $sender_rcvhost\n\t} \
	     {${if def:sender_ident \
		   {from ${quote_local_part:$sender_ident} }}}}\
	by $primary_hostname \
	(Exim $version_number)\
	${if def:tls_cipher {\n\t} { }}\
	${if def:received_protocol \
	     {with $received_protocol \
	      ${if def:tls_cipher {(cipher=$tls_cipher)}}}}\n\t\
	${if def:sender_address \
	     {(envelope-from $sender_address\
	      ${if def:authenticated_id \
		   {; auth=$authenticated_id}})\n\t}}\
	id $message_exim_id\
	${if def:received_for {\n\tfor $received_for}}

SECTION(global, smtp)m4_dnl
smtp_return_error_details = true
accept_8bitmime = true

SECTION(global, process)m4_dnl
extract_addresses_remove_arguments = false
headers_charset = utf-8
qualify_domain = CONF_master_domain
untrusted_set_sender = *

SECTION(global, bounce)m4_dnl
delay_warning = 1h : 24h : 2d

SECTION(global, tls)m4_dnl
tls_certificate = CONF_sysconf_dir/server.certlist
tls_privatekey = CONF_sysconf_dir/server.key
tls_advertise_hosts = ${if exists {CONF_sysconf_dir/server.key} {*}{}}
tls_dhparam = CONF_ca_dir/dh-param-2048.pem
tls_require_ciphers = ${if or {{={$received_port}{CONF_submission_port}} \
			       {match_ip {$sender_host_address}{+trusted}}} \
			   {CONF_good_ciphers} \
			   {CONF_acceptable_ciphers}}
tls_verify_certificates = CONF_ca_dir/ca.cert
tls_verify_hosts = ${if eq{$acl_c_mode}{submission} {} {+allnets}}

DIVERT(null)
###--------------------------------------------------------------------------
### Access control lists.

SECTION(global, acl-after)
SECTION(global, acl)m4_dnl
acl_smtp_helo = helo
SECTION(acl, misc)m4_dnl
helo:
	## Check that the caller's claimed identity is actually plausible.
	## This seems like it's a fairly effective filter on spamminess, but
	## it's too blunt a tool.  Rather than reject, add a warning header.
	## Only we can't do this the easy way, so save it up for use in MAIL.
	## Also, we're liable to get a subsequent HELO (e.g., after STARTTLS)
	## and we should only care about the most recent one.
	warn	 set acl_c_helo_warning = false
		!condition = \
			${if and {{match_ip {$sender_host_address} \
					    {<; 127.0.0.0/8 ; ::1}} \
				  {match_domain {$sender_helo_name} \
						{localhost : +thishost}}}}
		!condition = \
			${if exists {CONF_sysconf_dir/helo.conf} \
			     {${lookup {$sender_helo_name} \
				       partial0-lsearch \
				       {CONF_sysconf_dir/helo.conf} \
				       {${if match_ip \
					     {$sender_host_address} \
					     {<; $value}}}}}}
		!verify = helo
		 set acl_c_helo_warning = true

	accept

SECTION(global, acl)m4_dnl
acl_not_smtp_start = not_smtp_start
SECTION(acl, misc)m4_dnl
not_smtp_start:
	## Record the user's name.
	warn	 set acl_c_user = $sender_ident

	## Done.
	accept

SECTION(global, acl)m4_dnl
acl_smtp_mail = mail
SECTION(acl, mail)m4_dnl
mail:

	## If we stashed a warning header about HELO from earlier, we should
	## add it now.
	warn	 condition = $acl_c_helo_warning
		 add_header = :after_received:X-Distorted-Warning: \
			BADHELO \
			Client's HELO doesn't match its IP address.\n\t\
			helo-name=$sender_helo_name \
			address=$sender_host_address

	## Always allow the empty sender, so that we can receive bounces.
	accept	 senders = :

	## Ensure that the sender looks valid.
	require	 acl = mail_check_sender

	## If this is directly from a client then hack on it for a while.
	warn	 condition = ${if eq{$acl_c_mode}{submission}}
		 control = submission/sender_retain

	## Insist that a local client connect through TLS.
	deny	 message = Hosts within CONF_master_domain must use TLS
		!condition = ${if eq{$acl_c_mode}{submission}}
		 hosts = +allnets
		!encrypted = *

	## Check that a submitted message's sender address is allowable.
	require	 acl = mail_check_auth

SECTION(acl, mail-tail)m4_dnl
	## And we're done.
	accept

SECTION(acl, misc)m4_dnl
mail_check_sender:

	## See whether there's a special exception for this sender domain.
	accept	 senders = ${LOOKUP_DOMAIN($sender_address_domain,
			     {KV(senders, {$value}{})},
			     {})}

	## Ensure that the sender is routable.  This is important to prevent
	## undeliverable bounces.
	require	 message = Invalid sender; \
			($sender_verify_failure; $acl_verify_message)
		 verify = sender

	## We're good, then.
	accept

SECTION(global, acl)m4_dnl
acl_smtp_connect = connect
SECTION(acl, connect)m4_dnl
connect:
SECTION(acl, connect-tail)m4_dnl
	## Configure variables according to the submission mode.
	warn	 acl = check_submission

	## Done.
	accept

check_submission:
	## See whether this message needs hacking on.
	accept	!hosts = +thishost
		!condition = ${if ={$received_port}{CONF_submission_port}}
		 set acl_c_mode = relay

	## Remember to apply submission controls.
	warn	 set acl_c_mode = submission

	## Done.
	accept

SECTION(global, acl)m4_dnl
acl_smtp_rcpt = rcpt
SECTION(acl, rcpt)m4_dnl
rcpt:

	## Reject if the client isn't allowed to relay and the recipient
	## isn't in one of our known domains.
	require	 message = Relaying not permitted
		 acl = check_relay

	## Ensure that the recipient is routable.
	require	 message = Invalid recipient \
			($recipient_verify_failure; $acl_verify_message)
		 verify = recipient

SECTION(acl, misc)m4_dnl
check_relay:
	## Accept either if the client is allowed to relay through us, or if
	## we're the correct place to send this mail.

	## Known clients and authenticated users are OK.
	accept	  hosts = CONF_relay_clients
	accept	  authenticated = *

	## Known domains are OK.
	accept	  domains = +public

	## Finally, domains in our table are OK, unless they say they aren't.
	accept	  domains = \
		${if exists{CONF_sysconf_dir/domains.conf} \
		     {partial0-lsearch;	CONF_sysconf_dir/domains.conf}}
		  condition = DOMKV(service, {$value}{true})

	## Nope, that's not allowed.
	deny

SECTION(acl, rcpt-tail)m4_dnl
	## Everything checks out OK: let this one go through.
	accept

SECTION(global, acl)m4_dnl
acl_smtp_data = data
SECTION(acl, data)m4_dnl
data:

SECTION(acl, data-tail)m4_dnl
	accept

SECTION(global, acl)m4_dnl
acl_smtp_expn = expn_vrfy
acl_smtp_vrfy = expn_vrfy
SECTION(acl, misc)m4_dnl
expn_vrfy:
	accept	 hosts = +trusted
	deny	 message = Suck it and see

DIVERT(null)
###--------------------------------------------------------------------------
### Verification of sender address.

SECTION(acl, misc)m4_dnl
mail_check_auth:

	## If this isn't a submission then it doesn't need checking.
	accept	 condition = ${if !eq{$acl_c_mode}{submission}}

	## If the caller hasn't formally authenticated, but this is a
	## loopback connection, then we can trust identd to tell us the right
	## answer.  So we should stash the right name somewhere consistent.
	warn	 set acl_c_user = $authenticated_id
		 hosts = +thishost
		!authenticated = *
		 condition = ${if def:sender_ident}
		 set acl_c_user = $sender_ident

	## User must be authenticated by now.
	deny	 message = Sender not authenticated
		 condition = ${if !def:acl_c_user}

	## All done.
	accept

DIVERT(null)
###--------------------------------------------------------------------------
### Common options for forwarding routers.

## We're pretty permissive here.
m4_define(<:FILTER_BASE:>,
	<:driver = redirect
	modemask = 002
	check_owner = false
	check_group = false
	allow_filter = true
	allow_defer = true
	allow_fail = true
	forbid_blackhole = false
	check_ancestor = true:>)

## Common options for forwarding routers at verification time.
m4_define(<:FILTER_VERIFY:>,
	<:verify_only = true
	user = CONF_filter_user
	forbid_filter_dlfunc = true
	forbid_filter_logwrite = true
	forbid_filter_perl = true
	forbid_filter_readsocket = true
	forbid_filter_run = true
	file_transport = dummy
	directory_transport = dummy
	pipe_transport = dummy
	reply_transport = dummy:>)

## Transports for redirection filters.
m4_define(<:FILTER_TRANSPORTS:>,
	<:file_transport = mailbox
	directory_transport = maildir
	pipe_transport = pipe
	reply_transport = reply:>)

m4_define(<:FILTER_ROUTER:>,
<:$1_vrf:
	$2
	FILTER_VERIFY<::>$3
$1:
	$2
	verify = no
	FILTER_TRANSPORTS<::>$4:>)

DIVERT(null)
###--------------------------------------------------------------------------
### Common routers.

SECTION(routers, alias)m4_dnl
## Look up the local part in the address map.
alias:
	driver = redirect
	allow_fail = true
	allow_defer = true
	user = CONF_filter_user
	FILTER_TRANSPORTS
	local_parts = nwildlsearch; CONF_alias_file
	data = ${expand:$local_part_data}
SECTION(routers, alias-opts)m4_dnl

DIVERT(null)
###--------------------------------------------------------------------------
### Some standard transports.

m4_define(<:USER_DELIVERY:>,
	<:delivery_date_add = true
	envelope_to_add = true
	return_path_add = true:>)

SECTION(transports)m4_dnl
## A standard transport for remote delivery.  By default, try to do TLS, and
## don't worry too much if it's not very secure: the alternative is sending
## in plaintext anyway.  But all of this can be overridden from the
## `domains.conf' file.  Annoyingly, the `tls_dh_min_bits' setting isn't
## expanded before use, so we can't set it the obvious way.  Instead, encode
## it into the transport name.  This is very unpleasant, of course.
smtp:
	driver = smtp
	tls_require_ciphers = CONF_acceptable_ciphers
	tls_dh_min_bits = 1020
	tls_tempfail_tryclear = true

m4_define(<:SMTP_TRANS_DHBITS:>,
	<:driver = smtp
	hosts_try_auth = *
	hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
	hosts_require_auth = \
		${if bool {DOMKV(require-auth, {$value}{false})} {*}{}}
	tls_certificate = DOMKV(tls-certificate, {${expand:$value}}fail)
	tls_privatekey = DOMKV(tls-private-key, {${expand:$value}}fail)
	tls_verify_certificates = DOMKV(tls-peer-ca, {${expand:$value}}fail)
	tls_require_ciphers = \
		DOMKV(tls-ciphers,
		      {${extract {${expand:$value}} \
				 { good = CONF_good_ciphers \
				   any = CONF_acceptable_ciphers } \
				 {$value} \
				 {${expand:$value}}}} \
		      {CONF_acceptable_ciphers})
	tls_dh_min_bits = $1
	tls_tempfail_tryclear = true:>)m4_dnl
smtp_dhbits_1024:
	SMTP_TRANS_DHBITS(1020)
smtp_dhbits_2048:
	SMTP_TRANS_DHBITS(2046)

## Transport to a local SMTP server; use TLS and perform client
## authentication.
smtp_local:
	driver = smtp
	hosts_require_tls = *
	tls_certificate = CONF_sysconf_dir/client.certlist
	tls_privatekey = CONF_sysconf_dir/client.key
	tls_verify_certificates = CONF_ca_dir/ca.cert
	tls_require_ciphers = CONF_good_ciphers
	tls_dh_min_bits = 2046
	tls_tempfail_tryclear = false
	authenticated_sender = ${if def:authenticated_id \
				    {$authenticated_id@CONF_master_domain} \
				    fail}

## A standard transport for local delivery.
deliver:
	driver = appendfile
	file = /var/mail/$local_part
	group = mail
	mode = 0600
	mode_fail_narrower = false
	USER_DELIVERY

## Transports for user filters.
mailbox:
	driver = appendfile
	initgroups = true
	USER_DELIVERY

maildir:
	driver = appendfile
	maildir_format = true
	initgroups = true
	USER_DELIVERY

pipe:
	driver = pipe
	path = ${if and {{def:home} {exists{$home/bin}}} {$home/bin:} {}}\
		/usr/local/bin:/usr/local/sbin:\
		/usr/bin:/usr/sbin:/bin:/sbin
	initgroups = true
	umask = 002
	return_fail_output = true
	log_output = true

## A special dummy transport for use during address verification.
dummy:
	driver = appendfile
	file = /dev/null

DIVERT(null)
###--------------------------------------------------------------------------
### Retry configuration.

SECTION(retry, default)m4_dnl
## Default.
*					* \
	F,2h,15m; G,16h,2h,1.5; F,4d,6h

DIVERT(null)
###----- That's all, folks --------------------------------------------------
Commit	Line	Data
185b5456 MW	1	### --m4--
	2	###
	3	### Basic settings for distorted.org.uk Exim configuration
	4	###
	5	### (c) 2012 Mark Wooding
	6	###
	7
	8	###----- Licensing notice ---------------------------------------------------
	9	###
	10	### This program is free software; you can redistribute it and/or modify
	11	### it under the terms of the GNU General Public License as published by
	12	### the Free Software Foundation; either version 2 of the License, or
	13	### (at your option) any later version.
	14	###
	15	### This program is distributed in the hope that it will be useful,
	16	### but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	### GNU General Public License for more details.
	19	###
	20	### You should have received a copy of the GNU General Public License
	21	### along with this program; if not, write to the Free Software Foundation,
	22	### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	23
	24	###--------------------------------------------------------------------------
	25	### Global settings.
	26
	27	SECTION(global, priv)m4_dnl
b1d083dd	28	admin_groups = CONF_admin_groups
e8fc7835	29	trusted_groups = CONF_trusted_groups
185b5456 MW	30	prod_requires_admin = false
	31
	32	SECTION(global, logging)m4_dnl
	33	log_file_path = : syslog
	34	log_selector = \
	35	+smtp_confirmation \
	36	+tls_peerdn
	37	log_timezone = true
	38	syslog_duplication = false
	39	syslog_timestamp = false
	40
	41	SECTION(global, daemon)m4_dnl
	42	local_interfaces = <; CONF_interfaces
ad4e4191	43	extra_local_interfaces = <; 0.0.0.0 ; ::0
185b5456 MW	44
	45	SECTION(global, resource)m4_dnl
	46	deliver_queue_load_max = 8
	47	queue_only_load = 12
	48	smtp_accept_max = 16
	49	smtp_accept_queue = 32
	50	smtp_accept_reserve = 4
	51	smtp_load_reserve = 10
	52	smtp_reserve_hosts = +trusted
	53
	54	SECTION(global, policy)m4_dnl
	55	host_lookup = *
	56
	57	SECTION(global, users)m4_dnl
	58	gecos_name = $1
	59	gecos_pattern = ([^,:]*)
	60
	61	SECTION(global, incoming)m4_dnl
	62	received_header_text = Received: \
2cf9db84	63	${if def:sender_rcvhost \
9384ef4f	64	{from $sender_rcvhost\n\t} \
2cf9db84 MW	65	{${if def:sender_ident \
2cf9db84 MW	66	{from ${quote_local_part:$sender_ident} }}}}\
185b5456	67	by $primary_hostname \
b92689d6 MW	68	(Exim $version_number)\
b92689d6 MW	69	${if def:tls_cipher {\n\t} { }}\
185b5456 MW	70	${if def:received_protocol \
185b5456 MW	71	{with $received_protocol \
b92689d6	72	${if def:tls_cipher {(cipher=$tls_cipher)}}}}\n\t\
185b5456	73	${if def:sender_address \
43e6fc69	74	{(envelope-from $sender_address\
185b5456 MW	75	${if def:authenticated_id \
	76	{; auth=$authenticated_id}})\n\t}}\
	77	id $message_exim_id\
	78	${if def:received_for {\n\tfor $received_for}}
	79
	80	SECTION(global, smtp)m4_dnl
	81	smtp_return_error_details = true
	82	accept_8bitmime = true
	83
	84	SECTION(global, process)m4_dnl
	85	extract_addresses_remove_arguments = false
	86	headers_charset = utf-8
	87	qualify_domain = CONF_master_domain
12d3b444	88	untrusted_set_sender = *
185b5456 MW	89
	90	SECTION(global, bounce)m4_dnl
	91	delay_warning = 1h : 24h : 2d
	92
6aae076f	93	SECTION(global, tls)m4_dnl
163774f0	94	tls_certificate = CONF_sysconf_dir/server.certlist
6aae076f MW	95	tls_privatekey = CONF_sysconf_dir/server.key
	96	tls_advertise_hosts = ${if exists {CONF_sysconf_dir/server.key} {*}{}}
	97	tls_dhparam = CONF_ca_dir/dh-param-2048.pem
	98	tls_require_ciphers = ${if or {{={$received_port}{CONF_submission_port}} \
	99	{match_ip {$sender_host_address}{+trusted}}} \
	100	{CONF_good_ciphers} \
	101	{CONF_acceptable_ciphers}}
	102	tls_verify_certificates = CONF_ca_dir/ca.cert
	103	tls_verify_hosts = ${if eq{$acl_c_mode}{submission} {} {+allnets}}
	104
185b5456 MW	105	DIVERT(null)
	106	###--------------------------------------------------------------------------
	107	### Access control lists.
	108
	109	SECTION(global, acl-after)
	110	SECTION(global, acl)m4_dnl
	111	acl_smtp_helo = helo
	112	SECTION(acl, misc)m4_dnl
	113	helo:
fe8f2338 MW	114	## Check that the caller's claimed identity is actually plausible.
	115	## This seems like it's a fairly effective filter on spamminess, but
	116	## it's too blunt a tool. Rather than reject, add a warning header.
	117	## Only we can't do this the easy way, so save it up for use in MAIL.
	118	## Also, we're liable to get a subsequent HELO (e.g., after STARTTLS)
	119	## and we should only care about the most recent one.
	120	warn set acl_c_helo_warning = false
4ff4ad42 MW	121	!condition = \
	122	${if and {{match_ip {$sender_host_address} \
	123	{<; 127.0.0.0/8 ; ::1}} \
	124	{match_domain {$sender_helo_name} \
	125	{localhost : +thishost}}}}
fe8f2338 MW	126	!condition = \
	127	${if exists {CONF_sysconf_dir/helo.conf} \
	128	{${lookup {$sender_helo_name} \
	129	partial0-lsearch \
	130	{CONF_sysconf_dir/helo.conf} \
	131	{${if match_ip \
	132	{$sender_host_address} \
4587a704	133	{<; $value}}}}}}
fe8f2338 MW	134	!verify = helo
fe8f2338 MW	135	set acl_c_helo_warning = true
185b5456 MW	136
	137	accept
	138
284c9d7e MW	139	SECTION(global, acl)m4_dnl
	140	acl_not_smtp_start = not_smtp_start
	141	SECTION(acl, misc)m4_dnl
	142	not_smtp_start:
	143	## Record the user's name.
	144	warn set acl_c_user = $sender_ident
	145
	146	## Done.
	147	accept
	148
185b5456 MW	149	SECTION(global, acl)m4_dnl
	150	acl_smtp_mail = mail
	151	SECTION(acl, mail)m4_dnl
	152	mail:
	153
fe8f2338 MW	154	## If we stashed a warning header about HELO from earlier, we should
	155	## add it now.
	156	warn condition = $acl_c_helo_warning
	157	add_header = :after_received:X-Distorted-Warning: \
	158	BADHELO \
	159	Client's HELO doesn't match its IP address.\n\t\
60c96a7c	160	helo-name=$sender_helo_name \
d70f6d53	161	address=$sender_host_address
fe8f2338	162
185b5456 MW	163	## Always allow the empty sender, so that we can receive bounces.
	164	accept senders = :
	165
5051a30f MW	166	## Ensure that the sender looks valid.
5051a30f MW	167	require acl = mail_check_sender
185b5456 MW	168
	169	## If this is directly from a client then hack on it for a while.
	170	warn condition = ${if eq{$acl_c_mode}{submission}}
12d3b444	171	control = submission/sender_retain
185b5456	172
284c9d7e MW	173	## Insist that a local client connect through TLS.
	174	deny message = Hosts within CONF_master_domain must use TLS
	175	!condition = ${if eq{$acl_c_mode}{submission}}
	176	hosts = +allnets
	177	!encrypted = *
	178
	179	## Check that a submitted message's sender address is allowable.
	180	require acl = mail_check_auth
	181
185b5456 MW	182	SECTION(acl, mail-tail)m4_dnl
	183	## And we're done.
	184	accept
	185
5051a30f MW	186	SECTION(acl, misc)m4_dnl
	187	mail_check_sender:
	188
	189	## See whether there's a special exception for this sender domain.
	190	accept senders = ${LOOKUP_DOMAIN($sender_address_domain,
	191	{KV(senders, {$value}{})},
	192	{})}
	193
	194	## Ensure that the sender is routable. This is important to prevent
	195	## undeliverable bounces.
	196	require message = Invalid sender; \
	197	($sender_verify_failure; $acl_verify_message)
	198	verify = sender
	199
	200	## We're good, then.
	201	accept
	202
185b5456 MW	203	SECTION(global, acl)m4_dnl
	204	acl_smtp_connect = connect
	205	SECTION(acl, connect)m4_dnl
	206	connect:
	207	SECTION(acl, connect-tail)m4_dnl
e12c9586	208	## Configure variables according to the submission mode.
185b5456	209	warn acl = check_submission
e12c9586 MW	210
e12c9586 MW	211	## Done.
185b5456 MW	212	accept
	213
	214	check_submission:
	215	## See whether this message needs hacking on.
4ff4ad42	216	accept !hosts = +thishost
185b5456 MW	217	!condition = ${if ={$received_port}{CONF_submission_port}}
	218	set acl_c_mode = relay
	219
	220	## Remember to apply submission controls.
	221	warn set acl_c_mode = submission
	222
	223	## Done.
	224	accept
	225
	226	SECTION(global, acl)m4_dnl
	227	acl_smtp_rcpt = rcpt
	228	SECTION(acl, rcpt)m4_dnl
	229	rcpt:
	230
	231	## Reject if the client isn't allowed to relay and the recipient
	232	## isn't in one of our known domains.
e4666f2d MW	233	require message = Relaying not permitted
e4666f2d MW	234	acl = check_relay
185b5456 MW	235
	236	## Ensure that the recipient is routable.
	237	require message = Invalid recipient \
	238	($recipient_verify_failure; $acl_verify_message)
	239	verify = recipient
	240
e4666f2d MW	241	SECTION(acl, misc)m4_dnl
	242	check_relay:
	243	## Accept either if the client is allowed to relay through us, or if
	244	## we're the correct place to send this mail.
	245
	246	## Known clients and authenticated users are OK.
	247	accept hosts = CONF_relay_clients
	248	accept authenticated = *
	249
	250	## Known domains are OK.
	251	accept domains = +public
	252
	253	## Finally, domains in our table are OK, unless they say they aren't.
	254	accept domains = \
	255	${if exists{CONF_sysconf_dir/domains.conf} \
	256	{partial0-lsearch; CONF_sysconf_dir/domains.conf}}
	257	condition = DOMKV(service, {$value}{true})
	258
	259	## Nope, that's not allowed.
	260	deny
	261
185b5456 MW	262	SECTION(acl, rcpt-tail)m4_dnl
	263	## Everything checks out OK: let this one go through.
	264	accept
	265
	266	SECTION(global, acl)m4_dnl
	267	acl_smtp_data = data
	268	SECTION(acl, data)m4_dnl
	269	data:
	270
	271	SECTION(acl, data-tail)m4_dnl
	272	accept
	273
	274	SECTION(global, acl)m4_dnl
	275	acl_smtp_expn = expn_vrfy
	276	acl_smtp_vrfy = expn_vrfy
e4fe8925	277	SECTION(acl, misc)m4_dnl
185b5456 MW	278	expn_vrfy:
	279	accept hosts = +trusted
	280	deny message = Suck it and see
	281
	282	DIVERT(null)
	283	###--------------------------------------------------------------------------
284c9d7e MW	284	### Verification of sender address.
	285
	286	SECTION(acl, misc)m4_dnl
	287	mail_check_auth:
	288
	289	## If this isn't a submission then it doesn't need checking.
	290	accept condition = ${if !eq{$acl_c_mode}{submission}}
	291
	292	## If the caller hasn't formally authenticated, but this is a
	293	## loopback connection, then we can trust identd to tell us the right
	294	## answer. So we should stash the right name somewhere consistent.
	295	warn set acl_c_user = $authenticated_id
4ff4ad42	296	hosts = +thishost
284c9d7e	297	!authenticated = *
ff4c943d	298	condition = ${if def:sender_ident}
284c9d7e MW	299	set acl_c_user = $sender_ident
284c9d7e MW	300
ff4c943d	301	## User must be authenticated by now.
284c9d7e	302	deny message = Sender not authenticated
ff4c943d	303	condition = ${if !def:acl_c_user}
284c9d7e	304
284c9d7e MW	305	## All done.
	306	accept
	307
	308	DIVERT(null)
	309	###--------------------------------------------------------------------------
185b5456 MW	310	### Common options for forwarding routers.
	311
	312	## We're pretty permissive here.
	313	m4_define(<:FILTER_BASE:>,
	314	<:driver = redirect
	315	modemask = 002
	316	check_owner = false
	317	check_group = false
	318	allow_filter = true
	319	allow_defer = true
	320	allow_fail = true
	321	forbid_blackhole = false
	322	check_ancestor = true:>)
	323
	324	## Common options for forwarding routers at verification time.
	325	m4_define(<:FILTER_VERIFY:>,
	326	<:verify_only = true
	327	user = CONF_filter_user
	328	forbid_filter_dlfunc = true
	329	forbid_filter_logwrite = true
	330	forbid_filter_perl = true
	331	forbid_filter_readsocket = true
	332	forbid_filter_run = true
	333	file_transport = dummy
	334	directory_transport = dummy
	335	pipe_transport = dummy
	336	reply_transport = dummy:>)
	337
	338	## Transports for redirection filters.
	339	m4_define(<:FILTER_TRANSPORTS:>,
7ab75d6f	340	<:file_transport = mailbox
185b5456 MW	341	directory_transport = maildir
	342	pipe_transport = pipe
	343	reply_transport = reply:>)
	344
7ab75d6f MW	345	m4_define(<:FILTER_ROUTER:>,
	346	<:$1_vrf:
	347	$2
	348	FILTER_VERIFY<::>$3
	349	$1:
	350	$2
	351	verify = no
	352	FILTER_TRANSPORTS<::>$4:>)
	353
185b5456 MW	354	DIVERT(null)
185b5456 MW	355	###--------------------------------------------------------------------------
3e031e77 MW	356	### Common routers.
	357
	358	SECTION(routers, alias)m4_dnl
	359	## Look up the local part in the address map.
	360	alias:
	361	driver = redirect
	362	allow_fail = true
	363	allow_defer = true
	364	user = CONF_filter_user
	365	FILTER_TRANSPORTS
	366	local_parts = nwildlsearch; CONF_alias_file
	367	data = ${expand:$local_part_data}
	368	SECTION(routers, alias-opts)m4_dnl
	369
	370	DIVERT(null)
	371	###--------------------------------------------------------------------------
185b5456 MW	372	### Some standard transports.
	373
	374	m4_define(<:USER_DELIVERY:>,
	375	<:delivery_date_add = true
	376	envelope_to_add = true
	377	return_path_add = true:>)
	378
	379	SECTION(transports)m4_dnl
fa5a92c6 MW	380	## A standard transport for remote delivery. By default, try to do TLS, and
	381	## don't worry too much if it's not very secure: the alternative is sending
	382	## in plaintext anyway. But all of this can be overridden from the
beb15dae MW	383	## `domains.conf' file. Annoyingly, the `tls_dh_min_bits' setting isn't
	384	## expanded before use, so we can't set it the obvious way. Instead, encode
	385	## it into the transport name. This is very unpleasant, of course.
534d411b MW	386	smtp:
	387	driver = smtp
	388	tls_require_ciphers = CONF_acceptable_ciphers
	389	tls_dh_min_bits = 1020
	390	tls_tempfail_tryclear = true
	391
beb15dae MW	392	m4_define(<:SMTP_TRANS_DHBITS:>,
beb15dae MW	393	<:driver = smtp
ae9744ce	394	hosts_try_auth = *
fa5a92c6	395	hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
ae9744ce MW	396	hosts_require_auth = \
ae9744ce MW	397	${if bool {DOMKV(require-auth, {$value}{false})} {*}{}}
fa5a92c6 MW	398	tls_certificate = DOMKV(tls-certificate, {${expand:$value}}fail)
	399	tls_privatekey = DOMKV(tls-private-key, {${expand:$value}}fail)
	400	tls_verify_certificates = DOMKV(tls-peer-ca, {${expand:$value}}fail)
	401	tls_require_ciphers = \
	402	DOMKV(tls-ciphers,
	403	{${extract {${expand:$value}} \
	404	{ good = CONF_good_ciphers \
	405	any = CONF_acceptable_ciphers } \
	406	{$value} \
	407	{${expand:$value}}}} \
	408	{CONF_acceptable_ciphers})
beb15dae MW	409	tls_dh_min_bits = $1
beb15dae MW	410	tls_tempfail_tryclear = true:>)m4_dnl
beb15dae MW	411	smtp_dhbits_1024:
	412	SMTP_TRANS_DHBITS(1020)
	413	smtp_dhbits_2048:
	414	SMTP_TRANS_DHBITS(2046)
185b5456 MW	415
	416	## Transport to a local SMTP server; use TLS and perform client
	417	## authentication.
	418	smtp_local:
	419	driver = smtp
	420	hosts_require_tls = *
163774f0	421	tls_certificate = CONF_sysconf_dir/client.certlist
185b5456 MW	422	tls_privatekey = CONF_sysconf_dir/client.key
	423	tls_verify_certificates = CONF_ca_dir/ca.cert
	424	tls_require_ciphers = CONF_good_ciphers
b6d74252	425	tls_dh_min_bits = 2046
185b5456 MW	426	tls_tempfail_tryclear = false
185b5456 MW	427	authenticated_sender = ${if def:authenticated_id \
0bed9b7f	428	{$authenticated_id@CONF_master_domain} \
185b5456 MW	429	fail}
	430
	431	## A standard transport for local delivery.
	432	deliver:
	433	driver = appendfile
	434	file = /var/mail/$local_part
8f6af4ae MW	435	group = mail
	436	mode = 0600
	437	mode_fail_narrower = false
185b5456 MW	438	USER_DELIVERY
	439
	440	## Transports for user filters.
	441	mailbox:
	442	driver = appendfile
8f6af4ae	443	initgroups = true
185b5456 MW	444	USER_DELIVERY
	445
	446	maildir:
	447	driver = appendfile
	448	maildir_format = true
8f6af4ae	449	initgroups = true
185b5456 MW	450	USER_DELIVERY
	451
	452	pipe:
	453	driver = pipe
8f6af4ae MW	454	path = ${if and {{def:home} {exists{$home/bin}}} {$home/bin:} {}}\
	455	/usr/local/bin:/usr/local/sbin:\
	456	/usr/bin:/usr/sbin:/bin:/sbin
	457	initgroups = true
	458	umask = 002
	459	return_fail_output = true
	460	log_output = true
185b5456 MW	461
	462	## A special dummy transport for use during address verification.
	463	dummy:
	464	driver = appendfile
	465	file = /dev/null
	466
	467	DIVERT(null)
	468	###--------------------------------------------------------------------------
	469	### Retry configuration.
	470
	471	SECTION(retry, default)m4_dnl
	472	## Default.
	473	* * \
	474	F,2h,15m; G,16h,2h,1.5; F,4d,6h
	475
	476	DIVERT(null)
	477	###----- That's all, folks --------------------------------------------------