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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: \ | |
2cf9db84 | 62 | ${if def:sender_rcvhost \ |
9384ef4f | 63 | {from $sender_rcvhost\n\t} \ |
2cf9db84 MW |
64 | {${if def:sender_ident \ |
65 | {from ${quote_local_part:$sender_ident} }}}}\ | |
185b5456 | 66 | by $primary_hostname \ |
b92689d6 MW |
67 | (Exim $version_number)\ |
68 | ${if def:tls_cipher {\n\t} { }}\ | |
185b5456 MW |
69 | ${if def:received_protocol \ |
70 | {with $received_protocol \ | |
b92689d6 | 71 | ${if def:tls_cipher {(cipher=$tls_cipher)}}}}\n\t\ |
185b5456 | 72 | ${if def:sender_address \ |
43e6fc69 | 73 | {(envelope-from $sender_address\ |
185b5456 MW |
74 | ${if def:authenticated_id \ |
75 | {; auth=$authenticated_id}})\n\t}}\ | |
76 | id $message_exim_id\ | |
77 | ${if def:received_for {\n\tfor $received_for}} | |
78 | ||
79 | SECTION(global, smtp)m4_dnl | |
80 | smtp_return_error_details = true | |
81 | accept_8bitmime = true | |
82 | ||
83 | SECTION(global, process)m4_dnl | |
84 | extract_addresses_remove_arguments = false | |
85 | headers_charset = utf-8 | |
86 | qualify_domain = CONF_master_domain | |
87 | ||
88 | SECTION(global, bounce)m4_dnl | |
89 | delay_warning = 1h : 24h : 2d | |
90 | ||
6aae076f MW |
91 | SECTION(global, tls)m4_dnl |
92 | tls_certificate = CONF_sysconf_dir/server.cert | |
93 | tls_privatekey = CONF_sysconf_dir/server.key | |
94 | tls_advertise_hosts = ${if exists {CONF_sysconf_dir/server.key} {*}{}} | |
95 | tls_dhparam = CONF_ca_dir/dh-param-2048.pem | |
96 | tls_require_ciphers = ${if or {{={$received_port}{CONF_submission_port}} \ | |
97 | {match_ip {$sender_host_address}{+trusted}}} \ | |
98 | {CONF_good_ciphers} \ | |
99 | {CONF_acceptable_ciphers}} | |
100 | tls_verify_certificates = CONF_ca_dir/ca.cert | |
101 | tls_verify_hosts = ${if eq{$acl_c_mode}{submission} {} {+allnets}} | |
102 | ||
185b5456 MW |
103 | DIVERT(null) |
104 | ###-------------------------------------------------------------------------- | |
105 | ### Access control lists. | |
106 | ||
107 | SECTION(global, acl-after) | |
108 | SECTION(global, acl)m4_dnl | |
109 | acl_smtp_helo = helo | |
110 | SECTION(acl, misc)m4_dnl | |
111 | helo: | |
fe8f2338 MW |
112 | ## Check that the caller's claimed identity is actually plausible. |
113 | ## This seems like it's a fairly effective filter on spamminess, but | |
114 | ## it's too blunt a tool. Rather than reject, add a warning header. | |
115 | ## Only we can't do this the easy way, so save it up for use in MAIL. | |
116 | ## Also, we're liable to get a subsequent HELO (e.g., after STARTTLS) | |
117 | ## and we should only care about the most recent one. | |
118 | warn set acl_c_helo_warning = false | |
119 | !condition = \ | |
4ff4ad42 MW |
120 | ${if and {{match_ip {$sender_host_address} \ |
121 | {<; 127.0.0.0/8 ; ::1}} \ | |
122 | {match_domain {$sender_helo_name} \ | |
123 | {localhost : +thishost}}}} | |
124 | !condition = \ | |
fe8f2338 MW |
125 | ${if exists {CONF_sysconf_dir/helo.conf} \ |
126 | {${lookup {$sender_helo_name} \ | |
127 | partial0-lsearch \ | |
128 | {CONF_sysconf_dir/helo.conf} \ | |
129 | {${if match_ip \ | |
130 | {$sender_host_address} \ | |
131 | {$value}}}}}} | |
132 | !verify = helo | |
133 | set acl_c_helo_warning = true | |
185b5456 MW |
134 | |
135 | accept | |
136 | ||
137 | SECTION(global, acl)m4_dnl | |
284c9d7e MW |
138 | acl_not_smtp_start = not_smtp_start |
139 | SECTION(acl, misc)m4_dnl | |
140 | not_smtp_start: | |
141 | ## Record the user's name. | |
142 | warn set acl_c_user = $sender_ident | |
143 | ||
144 | ## Done. | |
145 | accept | |
146 | ||
147 | SECTION(global, acl)m4_dnl | |
185b5456 MW |
148 | acl_smtp_mail = mail |
149 | SECTION(acl, mail)m4_dnl | |
150 | mail: | |
151 | ||
fe8f2338 MW |
152 | ## If we stashed a warning header about HELO from earlier, we should |
153 | ## add it now. | |
154 | warn condition = $acl_c_helo_warning | |
155 | add_header = :after_received:X-Distorted-Warning: \ | |
156 | BADHELO \ | |
157 | Client's HELO doesn't match its IP address.\n\t\ | |
60c96a7c | 158 | helo-name=$sender_helo_name \ |
d70f6d53 | 159 | address=$sender_host_address |
fe8f2338 | 160 | |
185b5456 MW |
161 | ## Always allow the empty sender, so that we can receive bounces. |
162 | accept senders = : | |
163 | ||
164 | ## Ensure that the sender is routable. This is important to prevent | |
165 | ## undeliverable bounces. | |
166 | require message = Invalid sender; \ | |
167 | ($sender_verify_failure; $acl_verify_message) | |
168 | verify = sender | |
169 | ||
170 | ## If this is directly from a client then hack on it for a while. | |
171 | warn condition = ${if eq{$acl_c_mode}{submission}} | |
172 | control = submission | |
173 | ||
284c9d7e MW |
174 | ## Insist that a local client connect through TLS. |
175 | deny message = Hosts within CONF_master_domain must use TLS | |
176 | !condition = ${if eq{$acl_c_mode}{submission}} | |
177 | hosts = +allnets | |
178 | !encrypted = * | |
179 | ||
180 | ## Check that a submitted message's sender address is allowable. | |
181 | require acl = mail_check_auth | |
182 | ||
185b5456 MW |
183 | SECTION(acl, mail-tail)m4_dnl |
184 | ## And we're done. | |
185 | accept | |
186 | ||
187 | SECTION(global, acl)m4_dnl | |
188 | acl_smtp_connect = connect | |
189 | SECTION(acl, connect)m4_dnl | |
190 | connect: | |
191 | SECTION(acl, connect-tail)m4_dnl | |
e12c9586 | 192 | ## Configure variables according to the submission mode. |
185b5456 | 193 | warn acl = check_submission |
e12c9586 MW |
194 | |
195 | ## Done. | |
185b5456 MW |
196 | accept |
197 | ||
198 | check_submission: | |
199 | ## See whether this message needs hacking on. | |
4ff4ad42 | 200 | accept !hosts = +thishost |
185b5456 MW |
201 | !condition = ${if ={$received_port}{CONF_submission_port}} |
202 | set acl_c_mode = relay | |
203 | ||
204 | ## Remember to apply submission controls. | |
205 | warn set acl_c_mode = submission | |
206 | ||
207 | ## Done. | |
208 | accept | |
209 | ||
210 | SECTION(global, acl)m4_dnl | |
211 | acl_smtp_rcpt = rcpt | |
212 | SECTION(acl, rcpt)m4_dnl | |
213 | rcpt: | |
214 | ||
215 | ## Reject if the client isn't allowed to relay and the recipient | |
216 | ## isn't in one of our known domains. | |
e4666f2d MW |
217 | require message = Relaying not permitted |
218 | acl = check_relay | |
185b5456 MW |
219 | |
220 | ## Ensure that the recipient is routable. | |
221 | require message = Invalid recipient \ | |
222 | ($recipient_verify_failure; $acl_verify_message) | |
223 | verify = recipient | |
224 | ||
e4666f2d MW |
225 | SECTION(acl, misc)m4_dnl |
226 | check_relay: | |
227 | ## Accept either if the client is allowed to relay through us, or if | |
228 | ## we're the correct place to send this mail. | |
229 | ||
230 | ## Known clients and authenticated users are OK. | |
231 | accept hosts = CONF_relay_clients | |
232 | accept authenticated = * | |
233 | ||
234 | ## Known domains are OK. | |
235 | accept domains = +public | |
236 | ||
237 | ## Finally, domains in our table are OK, unless they say they aren't. | |
238 | accept domains = \ | |
239 | ${if exists{CONF_sysconf_dir/domains.conf} \ | |
240 | {partial0-lsearch; CONF_sysconf_dir/domains.conf}} | |
241 | condition = DOMKV(service, {$value}{true}) | |
242 | ||
243 | ## Nope, that's not allowed. | |
244 | deny | |
245 | ||
185b5456 MW |
246 | SECTION(acl, rcpt-tail)m4_dnl |
247 | ## Everything checks out OK: let this one go through. | |
248 | accept | |
249 | ||
250 | SECTION(global, acl)m4_dnl | |
251 | acl_smtp_data = data | |
252 | SECTION(acl, data)m4_dnl | |
253 | data: | |
254 | ||
255 | SECTION(acl, data-tail)m4_dnl | |
256 | accept | |
257 | ||
258 | SECTION(global, acl)m4_dnl | |
259 | acl_smtp_expn = expn_vrfy | |
260 | acl_smtp_vrfy = expn_vrfy | |
261 | SECTION(acl)m4_dnl | |
262 | expn_vrfy: | |
263 | accept hosts = +trusted | |
264 | deny message = Suck it and see | |
265 | ||
266 | DIVERT(null) | |
267 | ###-------------------------------------------------------------------------- | |
284c9d7e MW |
268 | ### Verification of sender address. |
269 | ||
270 | SECTION(acl, misc)m4_dnl | |
271 | mail_check_auth: | |
272 | ||
273 | ## If this isn't a submission then it doesn't need checking. | |
274 | accept condition = ${if !eq{$acl_c_mode}{submission}} | |
275 | ||
276 | ## If the caller hasn't formally authenticated, but this is a | |
277 | ## loopback connection, then we can trust identd to tell us the right | |
278 | ## answer. So we should stash the right name somewhere consistent. | |
279 | warn set acl_c_user = $authenticated_id | |
4ff4ad42 | 280 | hosts = +thishost |
284c9d7e | 281 | !authenticated = * |
ff4c943d | 282 | condition = ${if def:sender_ident} |
284c9d7e MW |
283 | set acl_c_user = $sender_ident |
284 | ||
ff4c943d | 285 | ## User must be authenticated by now. |
284c9d7e | 286 | deny message = Sender not authenticated |
ff4c943d | 287 | condition = ${if !def:acl_c_user} |
284c9d7e MW |
288 | |
289 | ## Make sure that the local part is one that the authenticated sender | |
290 | ## is allowed to claim. | |
291 | deny message = Sender address forbidden to calling user | |
459abd49 MW |
292 | !condition = \ |
293 | ${if exists {CONF_sysconf_dir/auth-sender.conf} \ | |
294 | {${lookup {$acl_c_user} \ | |
295 | lsearch \ | |
296 | {CONF_sysconf_dir/auth-sender.conf} \ | |
297 | {${if match_address \ | |
298 | {$sender_address} \ | |
299 | {+value}}} \ | |
300 | {false}}}} | |
284c9d7e MW |
301 | !condition = ${LOOKUP_DOMAIN($sender_address_domain, |
302 | {${if and {{match_local_part \ | |
303 | {$acl_c_user} \ | |
304 | {+dom_users}} \ | |
305 | {match_local_part \ | |
306 | {$sender_address_local_part} \ | |
307 | {+dom_locals}}}}}, | |
308 | {${if and {{match_local_part \ | |
309 | {$sender_address_local_part} \ | |
310 | {+user_extaddr}} \ | |
311 | {or {{eq {$sender_address_domain} \ | |
312 | {}} \ | |
313 | {match_domain \ | |
314 | {$sender_address_domain} \ | |
315 | {+public}}}}}}})} | |
316 | ||
317 | ## All done. | |
318 | accept | |
319 | ||
320 | DIVERT(null) | |
321 | ###-------------------------------------------------------------------------- | |
185b5456 MW |
322 | ### Common options for forwarding routers. |
323 | ||
324 | ## We're pretty permissive here. | |
325 | m4_define(<:FILTER_BASE:>, | |
326 | <:driver = redirect | |
327 | modemask = 002 | |
328 | check_owner = false | |
329 | check_group = false | |
330 | allow_filter = true | |
331 | allow_defer = true | |
332 | allow_fail = true | |
333 | forbid_blackhole = false | |
334 | check_ancestor = true:>) | |
335 | ||
336 | ## Common options for forwarding routers at verification time. | |
337 | m4_define(<:FILTER_VERIFY:>, | |
338 | <:verify_only = true | |
339 | user = CONF_filter_user | |
340 | forbid_filter_dlfunc = true | |
341 | forbid_filter_logwrite = true | |
342 | forbid_filter_perl = true | |
343 | forbid_filter_readsocket = true | |
344 | forbid_filter_run = true | |
345 | file_transport = dummy | |
346 | directory_transport = dummy | |
347 | pipe_transport = dummy | |
348 | reply_transport = dummy:>) | |
349 | ||
350 | ## Transports for redirection filters. | |
351 | m4_define(<:FILTER_TRANSPORTS:>, | |
7ab75d6f | 352 | <:file_transport = mailbox |
185b5456 MW |
353 | directory_transport = maildir |
354 | pipe_transport = pipe | |
355 | reply_transport = reply:>) | |
356 | ||
7ab75d6f MW |
357 | m4_define(<:FILTER_ROUTER:>, |
358 | <:$1_vrf: | |
359 | $2 | |
360 | FILTER_VERIFY<::>$3 | |
361 | $1: | |
362 | $2 | |
363 | verify = no | |
364 | FILTER_TRANSPORTS<::>$4:>) | |
365 | ||
185b5456 MW |
366 | DIVERT(null) |
367 | ###-------------------------------------------------------------------------- | |
368 | ### Some standard transports. | |
369 | ||
370 | m4_define(<:USER_DELIVERY:>, | |
371 | <:delivery_date_add = true | |
372 | envelope_to_add = true | |
373 | return_path_add = true:>) | |
374 | ||
375 | SECTION(transports)m4_dnl | |
fa5a92c6 MW |
376 | ## A standard transport for remote delivery. By default, try to do TLS, and |
377 | ## don't worry too much if it's not very secure: the alternative is sending | |
378 | ## in plaintext anyway. But all of this can be overridden from the | |
beb15dae MW |
379 | ## `domains.conf' file. Annoyingly, the `tls_dh_min_bits' setting isn't |
380 | ## expanded before use, so we can't set it the obvious way. Instead, encode | |
381 | ## it into the transport name. This is very unpleasant, of course. | |
534d411b MW |
382 | smtp: |
383 | driver = smtp | |
384 | tls_require_ciphers = CONF_acceptable_ciphers | |
385 | tls_dh_min_bits = 1020 | |
386 | tls_tempfail_tryclear = true | |
387 | ||
beb15dae MW |
388 | m4_define(<:SMTP_TRANS_DHBITS:>, |
389 | <:driver = smtp | |
ae9744ce | 390 | hosts_try_auth = * |
fa5a92c6 | 391 | hosts_require_tls = DOMKV(tls-peer-ca, {*}{}) |
ae9744ce MW |
392 | hosts_require_auth = \ |
393 | ${if bool {DOMKV(require-auth, {$value}{false})} {*}{}} | |
fa5a92c6 MW |
394 | tls_certificate = DOMKV(tls-certificate, {${expand:$value}}fail) |
395 | tls_privatekey = DOMKV(tls-private-key, {${expand:$value}}fail) | |
396 | tls_verify_certificates = DOMKV(tls-peer-ca, {${expand:$value}}fail) | |
397 | tls_require_ciphers = \ | |
398 | DOMKV(tls-ciphers, | |
399 | {${extract {${expand:$value}} \ | |
400 | { good = CONF_good_ciphers \ | |
401 | any = CONF_acceptable_ciphers } \ | |
402 | {$value} \ | |
403 | {${expand:$value}}}} \ | |
404 | {CONF_acceptable_ciphers}) | |
beb15dae MW |
405 | tls_dh_min_bits = $1 |
406 | tls_tempfail_tryclear = true:>)m4_dnl | |
beb15dae MW |
407 | smtp_dhbits_1024: |
408 | SMTP_TRANS_DHBITS(1020) | |
409 | smtp_dhbits_2048: | |
410 | SMTP_TRANS_DHBITS(2046) | |
185b5456 MW |
411 | |
412 | ## Transport to a local SMTP server; use TLS and perform client | |
413 | ## authentication. | |
414 | smtp_local: | |
415 | driver = smtp | |
416 | hosts_require_tls = * | |
417 | tls_certificate = CONF_sysconf_dir/client.cert | |
418 | tls_privatekey = CONF_sysconf_dir/client.key | |
419 | tls_verify_certificates = CONF_ca_dir/ca.cert | |
420 | tls_require_ciphers = CONF_good_ciphers | |
b6d74252 | 421 | tls_dh_min_bits = 2046 |
185b5456 MW |
422 | tls_tempfail_tryclear = false |
423 | authenticated_sender = ${if def:authenticated_id \ | |
0bed9b7f | 424 | {$authenticated_id@CONF_master_domain} \ |
185b5456 MW |
425 | fail} |
426 | ||
427 | ## A standard transport for local delivery. | |
428 | deliver: | |
429 | driver = appendfile | |
430 | file = /var/mail/$local_part | |
8f6af4ae MW |
431 | group = mail |
432 | mode = 0600 | |
433 | mode_fail_narrower = false | |
185b5456 MW |
434 | USER_DELIVERY |
435 | ||
436 | ## Transports for user filters. | |
437 | mailbox: | |
438 | driver = appendfile | |
8f6af4ae | 439 | initgroups = true |
185b5456 MW |
440 | USER_DELIVERY |
441 | ||
442 | maildir: | |
443 | driver = appendfile | |
444 | maildir_format = true | |
8f6af4ae | 445 | initgroups = true |
185b5456 MW |
446 | USER_DELIVERY |
447 | ||
448 | pipe: | |
449 | driver = pipe | |
8f6af4ae MW |
450 | path = ${if and {{def:home} {exists{$home/bin}}} {$home/bin:} {}}\ |
451 | /usr/local/bin:/usr/local/sbin:\ | |
452 | /usr/bin:/usr/sbin:/bin:/sbin | |
453 | initgroups = true | |
454 | umask = 002 | |
455 | return_fail_output = true | |
456 | log_output = true | |
185b5456 MW |
457 | |
458 | ## A special dummy transport for use during address verification. | |
459 | dummy: | |
460 | driver = appendfile | |
461 | file = /dev/null | |
462 | ||
463 | DIVERT(null) | |
464 | ###-------------------------------------------------------------------------- | |
465 | ### Retry configuration. | |
466 | ||
467 | SECTION(retry, default)m4_dnl | |
468 | ## Default. | |
469 | * * \ | |
470 | F,2h,15m; G,16h,2h,1.5; F,4d,6h | |
471 | ||
472 | DIVERT(null) | |
473 | ###----- That's all, folks -------------------------------------------------- |