[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
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 ; ::

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} }}\
	      ${if def:sender_helo_name \
		   {(helo=$sender_helo_name)\n\t}}}}\
	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

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

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 = \
			${if exists {CONF_sysconf_dir/helo.conf} \
			     {${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_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 is routable.  This is important to prevent
	## undeliverable bounces.
	require	 message = Invalid sender; \
			($sender_verify_failure; $acl_verify_message)
		 verify = 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

SECTION(acl, mail-tail)m4_dnl
	## And we're done.
	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 = +localnet
		!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.
	deny	 message = Relaying not permitted
		!hosts = CONF_relay_clients
		!authenticated = *
		!domains = +known

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

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)m4_dnl
expn_vrfy:
	accept	 hosts = +trusted
	deny	 message = Suck it and see

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:>)

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.  Try to do TLS, and don't worry
## too much if it's not very secure: the alternative is sending in plaintext
## anyway.
smtp:
	driver = smtp
	tls_require_ciphers = CONF_acceptable_ciphers
	tls_dh_min_bits = 1020
	tls_tempfail_tryclear = true

## 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.cert
	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
185b5456 MW	29	prod_requires_admin = false
	30
	31	SECTION(global, logging)m4_dnl
	32	log_file_path = : syslog
	33	log_selector = \
	34	+smtp_confirmation \
	35	+tls_peerdn
	36	log_timezone = true
	37	syslog_duplication = false
	38	syslog_timestamp = false
	39
	40	SECTION(global, daemon)m4_dnl
	41	local_interfaces = <; CONF_interfaces
	42	extra_local_interfaces = <; 0.0.0.0 ; ::
	43
	44	SECTION(global, resource)m4_dnl
	45	deliver_queue_load_max = 8
	46	queue_only_load = 12
	47	smtp_accept_max = 16
	48	smtp_accept_queue = 32
	49	smtp_accept_reserve = 4
	50	smtp_load_reserve = 10
	51	smtp_reserve_hosts = +trusted
	52
	53	SECTION(global, policy)m4_dnl
	54	host_lookup = *
	55
	56	SECTION(global, users)m4_dnl
	57	gecos_name = $1
	58	gecos_pattern = ([^,:]*)
	59
	60	SECTION(global, incoming)m4_dnl
	61	received_header_text = Received: \
	62	${if def:sender_rcvhost {from $sender_rcvhost\n\t} \
	63	{${if def:sender_ident \
	64	{from ${quote_local_part:$sender_ident} }}\
	65	${if def:sender_helo_name \
	66	{(helo=$sender_helo_name)\n\t}}}}\
	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 MW	73	${if def:sender_address \
	74	{(envelope-from <$sender_address>\
	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
	88
	89	SECTION(global, bounce)m4_dnl
	90	delay_warning = 1h : 24h : 2d
	91
	92	DIVERT(null)
	93	###--------------------------------------------------------------------------
	94	### Access control lists.
	95
	96	SECTION(global, acl-after)
	97	SECTION(global, acl)m4_dnl
	98	acl_smtp_helo = helo
	99	SECTION(acl, misc)m4_dnl
	100	helo:
fe8f2338 MW	101	## Check that the caller's claimed identity is actually plausible.
	102	## This seems like it's a fairly effective filter on spamminess, but
	103	## it's too blunt a tool. Rather than reject, add a warning header.
	104	## Only we can't do this the easy way, so save it up for use in MAIL.
	105	## Also, we're liable to get a subsequent HELO (e.g., after STARTTLS)
	106	## and we should only care about the most recent one.
	107	warn set acl_c_helo_warning = false
	108	!condition = \
	109	${if exists {CONF_sysconf_dir/helo.conf} \
	110	{${lookup {$sender_helo_name} \
	111	partial0-lsearch \
	112	{CONF_sysconf_dir/helo.conf} \
	113	{${if match_ip \
	114	{$sender_host_address} \
	115	{$value}}}}}}
	116	!verify = helo
	117	set acl_c_helo_warning = true
185b5456 MW	118
	119	accept
	120
	121	SECTION(global, acl)m4_dnl
	122	acl_smtp_mail = mail
	123	SECTION(acl, mail)m4_dnl
	124	mail:
	125
fe8f2338 MW	126	## If we stashed a warning header about HELO from earlier, we should
	127	## add it now.
	128	warn condition = $acl_c_helo_warning
	129	add_header = :after_received:X-Distorted-Warning: \
	130	BADHELO \
	131	Client's HELO doesn't match its IP address.\n\t\
	132	HELO name = $sender_helo_name, \
	133	address = $sender_host_address
	134
185b5456 MW	135	## Always allow the empty sender, so that we can receive bounces.
	136	accept senders = :
	137
	138	## Ensure that the sender is routable. This is important to prevent
	139	## undeliverable bounces.
	140	require message = Invalid sender; \
	141	($sender_verify_failure; $acl_verify_message)
	142	verify = sender
	143
	144	## If this is directly from a client then hack on it for a while.
	145	warn condition = ${if eq{$acl_c_mode}{submission}}
	146	control = submission
	147
	148	SECTION(acl, mail-tail)m4_dnl
	149	## And we're done.
	150	accept
	151
	152	SECTION(global, acl)m4_dnl
	153	acl_smtp_connect = connect
	154	SECTION(acl, connect)m4_dnl
	155	connect:
	156	SECTION(acl, connect-tail)m4_dnl
e12c9586	157	## Configure variables according to the submission mode.
185b5456	158	warn acl = check_submission
e12c9586 MW	159
e12c9586 MW	160	## Done.
185b5456 MW	161	accept
	162
	163	check_submission:
	164	## See whether this message needs hacking on.
	165	accept !hosts = +localnet
	166	!condition = ${if ={$received_port}{CONF_submission_port}}
	167	set acl_c_mode = relay
	168
	169	## Remember to apply submission controls.
	170	warn set acl_c_mode = submission
	171
	172	## Done.
	173	accept
	174
	175	SECTION(global, acl)m4_dnl
	176	acl_smtp_rcpt = rcpt
	177	SECTION(acl, rcpt)m4_dnl
	178	rcpt:
	179
	180	## Reject if the client isn't allowed to relay and the recipient
	181	## isn't in one of our known domains.
	182	deny message = Relaying not permitted
	183	!hosts = CONF_relay_clients
	184	!authenticated = *
	185	!domains = +known
	186
	187	## Ensure that the recipient is routable.
	188	require message = Invalid recipient \
	189	($recipient_verify_failure; $acl_verify_message)
	190	verify = recipient
	191
	192	SECTION(acl, rcpt-tail)m4_dnl
	193	## Everything checks out OK: let this one go through.
	194	accept
	195
	196	SECTION(global, acl)m4_dnl
	197	acl_smtp_data = data
	198	SECTION(acl, data)m4_dnl
	199	data:
	200
	201	SECTION(acl, data-tail)m4_dnl
	202	accept
	203
	204	SECTION(global, acl)m4_dnl
	205	acl_smtp_expn = expn_vrfy
	206	acl_smtp_vrfy = expn_vrfy
	207	SECTION(acl)m4_dnl
	208	expn_vrfy:
	209	accept hosts = +trusted
	210	deny message = Suck it and see
	211
	212	DIVERT(null)
	213	###--------------------------------------------------------------------------
	214	### Common options for forwarding routers.
	215
	216	## We're pretty permissive here.
	217	m4_define(<:FILTER_BASE:>,
	218	<:driver = redirect
	219	modemask = 002
	220	check_owner = false
	221	check_group = false
	222	allow_filter = true
	223	allow_defer = true
	224	allow_fail = true
225	forbid_blackhole = false
226	check_ancestor = true:>)
227
228	## Common options for forwarding routers at verification time.
229	m4_define(<:FILTER_VERIFY:>,
230	<:verify_only = true
231	user = CONF_filter_user
232	forbid_filter_dlfunc = true
233	forbid_filter_logwrite = true
234	forbid_filter_perl = true
235	forbid_filter_readsocket = true
236	forbid_filter_run = true
237	file_transport = dummy
238	directory_transport = dummy
239	pipe_transport = dummy
240	reply_transport = dummy:>)
241
242	## Transports for redirection filters.
243	m4_define(<:FILTER_TRANSPORTS:>,
244	<:file_transport = mailbox
245	directory_transport = maildir
246	pipe_transport = pipe
247	reply_transport = reply:>)
248
249	DIVERT(null)
250	###--------------------------------------------------------------------------
251	### Some standard transports.
252
253	m4_define(<:USER_DELIVERY:>,
254	<:delivery_date_add = true
255	envelope_to_add = true
256	return_path_add = true:>)
257
258	SECTION(transports)m4_dnl
259	## A standard transport for remote delivery. Try to do TLS, and don't worry
260	## too much if it's not very secure: the alternative is sending in plaintext
261	## anyway.
262	smtp:
263	driver = smtp
264	tls_require_ciphers = CONF_acceptable_ciphers
265	tls_dh_min_bits = 1020
266	tls_tempfail_tryclear = true
267
268	## Transport to a local SMTP server; use TLS and perform client
269	## authentication.
270	smtp_local:
271	driver = smtp
272	hosts_require_tls = *
273	tls_certificate = CONF_sysconf_dir/client.cert
274	tls_privatekey = CONF_sysconf_dir/client.key
275	tls_verify_certificates = CONF_ca_dir/ca.cert
276	tls_require_ciphers = CONF_good_ciphers
b6d74252	277	tls_dh_min_bits = 2046
185b5456 MW	278	tls_tempfail_tryclear = false
185b5456 MW	279	authenticated_sender = ${if def:authenticated_id \
0bed9b7f	280	{$authenticated_id@CONF_master_domain} \
185b5456 MW	281	fail}
	282
	283	## A standard transport for local delivery.
	284	deliver:
	285	driver = appendfile
	286	file = /var/mail/$local_part
8f6af4ae MW	287	group = mail
	288	mode = 0600
	289	mode_fail_narrower = false
185b5456 MW	290	USER_DELIVERY
	291
	292	## Transports for user filters.
	293	mailbox:
	294	driver = appendfile
8f6af4ae	295	initgroups = true
185b5456 MW	296	USER_DELIVERY
	297
	298	maildir:
	299	driver = appendfile
	300	maildir_format = true
8f6af4ae	301	initgroups = true
185b5456 MW	302	USER_DELIVERY
	303
	304	pipe:
	305	driver = pipe
8f6af4ae MW	306	path = ${if and {{def:home} {exists{$home/bin}}} {$home/bin:} {}}\
	307	/usr/local/bin:/usr/local/sbin:\
	308	/usr/bin:/usr/sbin:/bin:/sbin
	309	initgroups = true
	310	umask = 002
	311	return_fail_output = true
	312	log_output = true
185b5456 MW	313
	314	## A special dummy transport for use during address verification.
	315	dummy:
	316	driver = appendfile
	317	file = /dev/null
	318
	319	DIVERT(null)
	320	###--------------------------------------------------------------------------
	321	### Retry configuration.
	322
	323	SECTION(retry, default)m4_dnl
	324	## Default.
	325	* * \
	326	F,2h,15m; G,16h,2h,1.5; F,4d,6h
	327
	328	DIVERT(null)
	329	###----- That's all, folks --------------------------------------------------