3 ### Basic settings for distorted.org.uk Exim configuration
5 ### (c) 2012 Mark Wooding
8 ###----- Licensing notice ---------------------------------------------------
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.
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.
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.
24 ###--------------------------------------------------------------------------
27 SECTION(global, priv)m4_dnl
28 admin_groups = CONF_admin_groups
29 trusted_groups = CONF_trusted_groups
30 prod_requires_admin = false
32 SECTION(global, logging)m4_dnl
33 log_file_path = : syslog
38 syslog_duplication = false
39 syslog_timestamp = false
41 SECTION(global, daemon)m4_dnl
42 local_interfaces = <; CONF_interfaces
43 extra_local_interfaces = <; 0.0.0.0 ; ::0
45 SECTION(global, resource)m4_dnl
46 deliver_queue_load_max = 8
49 smtp_accept_queue = 32
50 smtp_accept_reserve = 4
51 smtp_load_reserve = 10
52 smtp_reserve_hosts = +trusted
54 SECTION(global, policy)m4_dnl
57 SECTION(global, users)m4_dnl
59 gecos_pattern = ([^,:]*)
61 SECTION(global, incoming)m4_dnl
62 received_header_text = Received: \
63 ${if def:sender_rcvhost \
64 {from $sender_rcvhost\n\t} \
65 {${if def:sender_ident \
66 {from ${quote_local_part:$sender_ident} }}}}\
67 by $primary_hostname \
68 (Exim $version_number)\
69 ${if def:tls_cipher {\n\t} { }}\
70 ${if def:received_protocol \
71 {with $received_protocol \
72 ${if def:tls_cipher {(cipher=$tls_cipher)}}}}\n\t\
73 ${if def:sender_address \
74 {(envelope-from $sender_address\
75 ${if def:authenticated_id \
76 {; auth=$authenticated_id}})\n\t}}\
78 ${if def:received_for {\n\tfor $received_for}}
80 SECTION(global, smtp)m4_dnl
81 smtp_return_error_details = true
82 accept_8bitmime = true
84 SECTION(global, process)m4_dnl
85 extract_addresses_remove_arguments = false
86 headers_charset = utf-8
87 qualify_domain = CONF_master_domain
88 untrusted_set_sender = *
90 SECTION(global, bounce)m4_dnl
91 delay_warning = 1h : 24h : 2d
93 SECTION(global, tls)m4_dnl
94 tls_certificate = CONF_sysconf_dir/server.certlist
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}}
106 ###--------------------------------------------------------------------------
107 ### Access control lists.
109 SECTION(global, acl-after)
110 SECTION(global, acl)m4_dnl
112 SECTION(acl, misc)m4_dnl
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
122 ${if and {{match_ip {$sender_host_address} \
123 {<; 127.0.0.0/8 ; ::1}} \
124 {match_domain {$sender_helo_name} \
125 {localhost : +thishost}}}}
127 ${if exists {CONF_sysconf_dir/helo.conf} \
128 {${lookup {$sender_helo_name} \
130 {CONF_sysconf_dir/helo.conf} \
132 {$sender_host_address} \
135 set acl_c_helo_warning = true
139 SECTION(global, acl)m4_dnl
140 acl_not_smtp_start = not_smtp_start
141 SECTION(acl, misc)m4_dnl
143 ## Record the user's name.
144 warn set acl_c_user = $sender_ident
149 SECTION(global, acl)m4_dnl
151 SECTION(acl, mail)m4_dnl
154 ## If we stashed a warning header about HELO from earlier, we should
155 ## add it now. Only don't bother if the client has authenticated
156 ## successfully for submission (because we can't expect mobile
157 ## clients to be properly set up knowing their names), or it's one of
158 ## our own satellites (because they're either properly set up anyway,
159 ## or satellites using us as a smarthost).
160 warn condition = $acl_c_helo_warning
161 !condition = ${if eq{$acl_c_mode}{submission}}
163 WARNING_HEADER(BADHELO,
164 <:Client's HELO doesn't match its IP address.\n\t\
165 helo-name=$sender_helo_name \
166 address=$sender_host_address:>)
168 ## Always allow the empty sender, so that we can receive bounces.
171 ## Ensure that the sender looks valid.
172 require acl = mail_check_sender
174 ## If this is directly from a client then hack on it for a while.
175 warn condition = ${if eq{$acl_c_mode}{submission}}
176 control = submission/sender_retain
178 ## Insist that a local client connect through TLS.
179 deny message = Hosts within CONF_master_domain must use TLS
180 !condition = ${if eq{$acl_c_mode}{submission}}
184 ## Check that a submitted message's sender address is allowable.
185 require acl = mail_check_auth
187 SECTION(acl, mail-tail)m4_dnl
191 SECTION(acl, misc)m4_dnl
194 ## See whether there's a special exception for this sender domain.
195 accept senders = ${LOOKUP_DOMAIN($sender_address_domain,
196 {KV(senders, {$value}{})},
199 ## Ensure that the sender is routable. This is important to prevent
200 ## undeliverable bounces.
201 require message = Invalid sender; \
202 ($sender_verify_failure; $acl_verify_message)
208 SECTION(global, acl)m4_dnl
209 acl_smtp_connect = connect
210 SECTION(acl, connect)m4_dnl
212 SECTION(acl, connect-tail)m4_dnl
213 ## Configure variables according to the submission mode.
214 warn acl = check_submission
220 ## See whether this message needs hacking on.
221 accept !hosts = +thishost
222 !condition = ${if ={$received_port}{CONF_submission_port}}
223 set acl_c_mode = relay
225 ## Remember to apply submission controls.
226 warn set acl_c_mode = submission
231 SECTION(global, acl)m4_dnl
233 SECTION(acl, rcpt)m4_dnl
236 ## Reject if the client isn't allowed to relay and the recipient
237 ## isn't in one of our known domains.
238 require message = Relaying not permitted
241 ## Ensure that the recipient is routable.
242 require message = Invalid recipient \
243 ($recipient_verify_failure; $acl_verify_message)
246 SECTION(acl, misc)m4_dnl
248 ## Accept either if the client is allowed to relay through us, or if
249 ## we're the correct place to send this mail.
251 ## Known clients and authenticated users are OK.
252 accept hosts = CONF_relay_clients
253 accept authenticated = *
255 ## Known domains are OK.
256 accept domains = +public
258 ## Finally, domains in our table are OK, unless they say they aren't.
260 ${if exists{CONF_sysconf_dir/domains.conf} \
261 {partial0-lsearch; CONF_sysconf_dir/domains.conf}}
262 condition = DOMKV(service, {$value}{true})
264 ## Nope, that's not allowed.
267 SECTION(acl, rcpt-tail)m4_dnl
268 ## Everything checks out OK: let this one go through.
271 SECTION(global, acl)m4_dnl
273 SECTION(acl, data)m4_dnl
276 SECTION(acl, data-tail)m4_dnl
279 SECTION(global, acl)m4_dnl
280 acl_smtp_expn = expn_vrfy
281 acl_smtp_vrfy = expn_vrfy
282 SECTION(acl, misc)m4_dnl
284 accept hosts = +trusted
285 deny message = Suck it and see
288 ###--------------------------------------------------------------------------
289 ### Verification of sender address.
291 SECTION(acl, misc)m4_dnl
294 ## If this isn't a submission then it doesn't need checking.
295 accept condition = ${if !eq{$acl_c_mode}{submission}}
297 ## If the caller hasn't formally authenticated, but this is a
298 ## loopback connection, then we can trust identd to tell us the right
299 ## answer. So we should stash the right name somewhere consistent.
300 warn set acl_c_user = $authenticated_id
303 condition = ${if def:sender_ident}
304 set acl_c_user = $sender_ident
306 ## User must be authenticated by now.
307 deny message = Sender not authenticated
308 condition = ${if !def:acl_c_user}
314 ###--------------------------------------------------------------------------
315 ### Common options for forwarding routers.
317 ## We're pretty permissive here.
318 m4_define(<:FILTER_BASE:>,
326 forbid_blackhole = false
327 check_ancestor = true:>)
329 ## Common options for forwarding routers at verification time.
330 m4_define(<:FILTER_VERIFY:>,
332 user = CONF_filter_user
333 forbid_filter_dlfunc = true
334 forbid_filter_logwrite = true
335 forbid_filter_perl = true
336 forbid_filter_readsocket = true
337 forbid_filter_run = true
338 file_transport = dummy
339 directory_transport = dummy
340 pipe_transport = dummy
341 reply_transport = dummy:>)
343 ## Transports for redirection filters.
344 m4_define(<:FILTER_TRANSPORTS:>,
345 <:file_transport = mailbox
346 directory_transport = maildir
347 pipe_transport = pipe
348 reply_transport = reply:>)
350 m4_define(<:FILTER_ROUTER:>,
357 FILTER_TRANSPORTS<::>$4:>)
360 ###--------------------------------------------------------------------------
363 SECTION(routers, alias)m4_dnl
364 ## Look up the local part in the address map.
369 user = CONF_filter_user
371 local_parts = nwildlsearch; CONF_alias_file
372 data = ${expand:$local_part_data}
373 SECTION(routers, alias-opts)m4_dnl
376 ###--------------------------------------------------------------------------
377 ### Some standard transports.
379 m4_define(<:USER_DELIVERY:>,
380 <:delivery_date_add = true
381 envelope_to_add = true
382 return_path_add = true:>)
384 m4_define(<:APPLY_HEADER_CHANGES:>,
385 <:headers_add = m4_ifelse(<:$1:>, <::>,
387 <:${if def:acl_m_hdradd{$acl_m_hdradd\n}}\
389 headers_remove = m4_ifelse(<:$2:>, <::>,
391 <:${if def:acl_m_hdrrm{$acl_m_hdrrm:}}\
394 SECTION(transports)m4_dnl
395 ## A standard transport for remote delivery. By default, try to do TLS, and
396 ## don't worry too much if it's not very secure: the alternative is sending
397 ## in plaintext anyway. But all of this can be overridden from the
398 ## `domains.conf' file. Annoyingly, the `tls_dh_min_bits' setting isn't
399 ## expanded before use, so we can't set it the obvious way. Instead, encode
400 ## it into the transport name. This is very unpleasant, of course.
404 tls_require_ciphers = CONF_acceptable_ciphers
405 tls_dh_min_bits = 1020
406 tls_tempfail_tryclear = true
408 m4_define(<:SMTP_TRANS_DHBITS:>,
412 hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
413 hosts_require_auth = \
414 ${if bool {DOMKV(require-auth, {$value}{false})} {*}{}}
415 tls_certificate = DOMKV(tls-certificate, {${expand:$value}}fail)
416 tls_privatekey = DOMKV(tls-private-key, {${expand:$value}}fail)
417 tls_verify_certificates = DOMKV(tls-peer-ca, {${expand:$value}}fail)
418 tls_require_ciphers = \
420 {${extract {${expand:$value}} \
421 { good = CONF_good_ciphers \
422 any = CONF_acceptable_ciphers } \
424 {${expand:$value}}}} \
425 {CONF_acceptable_ciphers})
427 tls_tempfail_tryclear = true:>)m4_dnl
429 SMTP_TRANS_DHBITS(1020)
431 SMTP_TRANS_DHBITS(2046)
433 ## Transport to a local SMTP server; use TLS and perform client
438 hosts_require_tls = *
439 tls_certificate = CONF_sysconf_dir/client.certlist
440 tls_privatekey = CONF_sysconf_dir/client.key
441 tls_verify_certificates = CONF_ca_dir/ca.cert
442 tls_require_ciphers = CONF_good_ciphers
443 tls_dh_min_bits = 2046
444 tls_tempfail_tryclear = false
445 authenticated_sender = ${if def:authenticated_id \
446 {$authenticated_id@CONF_master_domain} \
449 ## A standard transport for local delivery.
453 file = /var/mail/$local_part
456 mode_fail_narrower = false
459 ## Transports for user filters.
469 maildir_format = true
476 path = ${if and {{def:home} {exists{$home/bin}}} {$home/bin:} {}}\
477 /usr/local/bin:/usr/local/sbin:\
478 /usr/bin:/usr/sbin:/bin:/sbin
481 return_fail_output = true
484 ## A special dummy transport for use during address verification.
490 ###--------------------------------------------------------------------------
491 ### Retry configuration.
493 SECTION(retry, default)m4_dnl
496 F,2h,15m; G,16h,2h,1.5; F,4d,6h
499 ###----- That's all, folks --------------------------------------------------