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e62ceaf0 DM |
1 | [[chapter_pmgconfig]] |
2 | ifdef::manvolnum[] | |
3 | pmgconfig(1) | |
4 | ============ | |
5 | :pmg-toplevel: | |
6 | ||
7 | NAME | |
8 | ---- | |
9 | ||
10 | pmgconfig - Proxmox Mail Gateway Configuration Management Toolkit | |
11 | ||
12 | ||
13 | SYNOPSIS | |
14 | -------- | |
15 | ||
16 | include::pmgconfig.1-synopsis.adoc[] | |
17 | ||
18 | ||
19 | DESCRIPTION | |
20 | ----------- | |
21 | endif::manvolnum[] | |
22 | ifndef::manvolnum[] | |
66e9c719 DM |
23 | Configuration Management |
24 | ======================== | |
e62ceaf0 DM |
25 | :pmg-toplevel: |
26 | endif::manvolnum[] | |
27 | ||
685576c2 DM |
28 | {pmg} is usually configured using the web-based Graphical User |
29 | Interface (GUI), but it is also possible to directly edit the | |
30 | configuration files, use the REST API over 'https' | |
66e9c719 | 31 | or the command line tool `pmgsh`. |
685576c2 | 32 | |
66e9c719 | 33 | The command line tool `pmgconfig` is used to simplify some common |
685576c2 DM |
34 | configuration tasks, i.e. to generate cerificates and to rewrite |
35 | service configuration files. | |
36 | ||
66e9c719 DM |
37 | NOTE: We use a Postgres database to store mail filter rules and |
38 | statistic data. See chapter xref:chapter_pmgdb[Database Management] | |
39 | for more information. | |
40 | ||
41 | ||
42 | Configuration files overview | |
43 | ---------------------------- | |
44 | ||
45 | `/etc/network/interfaces`:: | |
46 | ||
47 | Network setup. We never modify this files directly. Instead, we write | |
48 | changes to `/etc/network/interfaces.new`. When you reboot, we rename | |
49 | the file to `/etc/network/interfaces`, so any changes gets activated | |
50 | on the next reboot. | |
51 | ||
9bfe27f3 DM |
52 | `/etc/resolv.conf`:: |
53 | ||
54 | DNS search domain and nameserver setup. | |
55 | ||
56 | `/etc/hostname`:: | |
57 | ||
58 | The system's host name. | |
59 | ||
60 | `/etc/hosts`:: | |
61 | ||
62 | Static table lookup for hostnames. | |
63 | ||
66e9c719 DM |
64 | `/etc/pmg/pmg.conf`:: |
65 | ||
66 | Stores common administration options, i.e. the spam and mail proxy setup. | |
67 | ||
68 | `/etc/pmg/cluster.conf`:: | |
69 | ||
70 | The cluster setup. | |
71 | ||
72 | `/etc/pmg/domains`:: | |
73 | ||
74 | The list of relay domains. | |
75 | ||
5053eecc SI |
76 | `/etc/pmg/dkim/domains`:: |
77 | ||
78 | The list of domains for outbound DKIM signing. | |
79 | ||
66e9c719 DM |
80 | `/etc/pmg/fetchmailrc`:: |
81 | ||
82 | Fetchmail configuration (POP3 and IMAP setup). | |
83 | ||
84 | `/etc/pmg/ldap.conf`:: | |
85 | ||
86 | LDAP configuration. | |
87 | ||
88 | `/etc/pmg/mynetworks`:: | |
89 | ||
90 | List of local (trusted) networks. | |
91 | ||
92 | `/etc/pmg/subscription`:: | |
93 | ||
94 | Stores your subscription key and status. | |
95 | ||
37b2b051 SI |
96 | `/etc/pmg/tls_policy`:: |
97 | ||
98 | TLS policy for outbound connections. | |
99 | ||
66e9c719 DM |
100 | `/etc/pmg/transports`:: |
101 | ||
102 | Message delivery transport setup. | |
103 | ||
104 | `/etc/pmg/user.conf`:: | |
105 | ||
106 | GUI user configuration. | |
107 | ||
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108 | `/etc/mail/spamassassin/custom.cf`:: |
109 | ||
110 | Custom {spamassassin} setup. | |
111 | ||
8b4756e5 SI |
112 | `/etc/mail/spamassassin/pmg-scores.cf`:: |
113 | ||
114 | Custom {spamassassin} rule scores. | |
66e9c719 DM |
115 | |
116 | Keys and Certificates | |
117 | --------------------- | |
118 | ||
119 | `/etc/pmg/pmg-api.pem`:: | |
120 | ||
121 | Key and certificate (combined) used be the HTTPs server (API). | |
122 | ||
123 | `/etc/pmg/pmg-authkey.key`:: | |
124 | ||
125 | Privat key use to generate authentication tickets. | |
126 | ||
127 | `/etc/pmg/pmg-authkey.pub`:: | |
128 | ||
129 | Public key use to verify authentication tickets. | |
130 | ||
131 | `/etc/pmg/pmg-csrf.key`:: | |
132 | ||
133 | Internally used to generate CSRF tokens. | |
134 | ||
135 | `/etc/pmg/pmg-tls.pem`:: | |
136 | ||
137 | Key and certificate (combined) to encrypt mail traffic (TLS). | |
138 | ||
5053eecc SI |
139 | `/etc/pmg/dkim/<selector>.private`:: |
140 | ||
141 | Key for DKIM signing mails with selector '<selector>'. | |
142 | ||
66e9c719 | 143 | |
69a428d9 | 144 | [[pmgconfig_template_engine]] |
66e9c719 DM |
145 | Service Configuration Templates |
146 | ------------------------------- | |
147 | ||
9c85cc80 DM |
148 | {pmg} uses various services to implement mail filtering, for example |
149 | the {postfix} Mail Transport Agent (MTA), the {clamav} antivirus | |
150 | engine and the Apache {spamassassin} project. Those services use | |
151 | separate configuration files, so we need to rewrite those files when | |
152 | configuration is changed. | |
153 | ||
154 | We use a template based approach to generate those files. The {tts} is | |
155 | a well known, fast and flexible template processing system. You can | |
156 | find the default templates in `/var/lib/pmg/templates/`. Please do not | |
157 | modify them directly, because your modification would get lost on the | |
9dd45bd7 SI |
158 | next update. Instead, copy the template you wish to change to |
159 | `/etc/pmg/templates/`, then apply your changes there. | |
9c85cc80 DM |
160 | |
161 | Templates can access any configuration setting, and you can use the | |
162 | `pmgconfig dump` command to get a list of all variable names: | |
163 | ||
164 | ---- | |
165 | # pmgconfig dump | |
166 | ... | |
167 | dns.domain = yourdomain.tld | |
168 | dns.hostname = pmg | |
169 | ipconfig.int_ip = 192.168.2.127 | |
170 | pmg.admin.advfilter = 1 | |
171 | ... | |
172 | ---- | |
173 | ||
174 | The same tool is used to force regeneration of all template based | |
175 | configuration files. You need to run that after modifying a template, | |
176 | or when you directly edit configuration files | |
177 | ||
178 | ---- | |
179 | # pmgconfig sync --restart 1 | |
180 | ---- | |
181 | ||
9dd45bd7 | 182 | The above command also restarts services if the underlying configuration |
9c85cc80 DM |
183 | files are changed. Please note that this is automatically done when |
184 | you change the configuration using the GUI or API. | |
185 | ||
186 | NOTE: Modified templates from `/etc/pmg/templates/` are automatically | |
187 | synced from the master node to all cluster members. | |
66e9c719 DM |
188 | |
189 | ||
4a08dffe | 190 | [[pmgconfig_systemconfig]] |
685576c2 DM |
191 | System Configuration |
192 | -------------------- | |
193 | ||
194 | Network and Time | |
195 | ~~~~~~~~~~~~~~~~ | |
196 | ||
197 | ifndef::manvolnum[] | |
a695a527 | 198 | [thumbnail="pmg-gui-network-config.png", big=1] |
685576c2 DM |
199 | endif::manvolnum[] |
200 | ||
45de5bf5 | 201 | Normally the network and time is already configured when you visit the |
c6e27848 | 202 | GUI. The installer asks for those settings and sets up the correct |
45de5bf5 DM |
203 | values. |
204 | ||
205 | The default setup uses a single Ethernet adapter and static IP | |
206 | assignment. The configuration is stored at '/etc/network/interfaces', | |
207 | and the actual network setup is done the standard Debian way using | |
208 | package 'ifupdown'. | |
209 | ||
210 | .Example network setup '/etc/network/interfaces' | |
211 | ---- | |
212 | source /etc/network/interfaces.d/* | |
213 | ||
214 | auto lo | |
215 | iface lo inet loopback | |
216 | ||
217 | auto ens18 | |
218 | iface ens18 inet static | |
219 | address 192.168.2.127 | |
220 | netmask 255.255.240.0 | |
221 | gateway 192.168.2.1 | |
222 | ---- | |
223 | ||
224 | .DNS recommendations | |
225 | ||
226 | Many tests to detect SPAM mails use DNS queries, so it is important to | |
227 | have a fast and reliable DNS server. We also query some public | |
228 | available DNS Blacklists. Most of them apply rate limits for clients, | |
229 | so they simply will not work if you use a public DNS server (because | |
230 | they are usually blocked). We recommend to use your own DNS server, | |
231 | which need to be configured in 'recursive' mode. | |
685576c2 DM |
232 | |
233 | ||
234 | Options | |
235 | ~~~~~~~ | |
236 | ||
237 | ifndef::manvolnum[] | |
a695a527 | 238 | [thumbnail="pmg-gui-system-options.png", big=1] |
685576c2 DM |
239 | endif::manvolnum[] |
240 | ||
e09057ab DM |
241 | |
242 | Those settings are saved to subsection 'admin' in `/etc/pmg/pmg.conf`, | |
243 | using the following configuration keys: | |
244 | ||
685576c2 DM |
245 | include::pmg.admin-conf-opts.adoc[] |
246 | ||
c331641e DM |
247 | |
248 | Mail Proxy Configuration | |
249 | ------------------------ | |
250 | ||
4a08dffe | 251 | [[pmgconfig_mailproxy_relaying]] |
c331641e DM |
252 | Relaying |
253 | ~~~~~~~~ | |
254 | ||
c331641e | 255 | ifndef::manvolnum[] |
a695a527 | 256 | [thumbnail="pmg-gui-mailproxy-relaying.png", big=1] |
c331641e DM |
257 | endif::manvolnum[] |
258 | ||
e09057ab DM |
259 | Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`, |
260 | using the following configuration keys: | |
261 | ||
262 | include::pmg.mail-relaying-conf-opts.adoc[] | |
c331641e | 263 | |
4a08dffe | 264 | [[pmgconfig_mailproxy_relay_domains]] |
c331641e DM |
265 | Relay Domains |
266 | ~~~~~~~~~~~~~ | |
267 | ||
c331641e | 268 | ifndef::manvolnum[] |
a695a527 | 269 | [thumbnail="pmg-gui-mailproxy-relaydomains.png", big=1] |
c331641e DM |
270 | endif::manvolnum[] |
271 | ||
6822b369 DM |
272 | List of relayed mail domains, i.e. what destination domains this |
273 | system will relay mail to. The system will reject incoming mails to | |
274 | other domains. | |
c331641e | 275 | |
d9c56b22 | 276 | |
4a08dffe | 277 | [[pmgconfig_mailproxy_ports]] |
c331641e DM |
278 | Ports |
279 | ~~~~~ | |
280 | ||
c331641e | 281 | ifndef::manvolnum[] |
a695a527 | 282 | [thumbnail="pmg-gui-mailproxy-ports.png", big=1] |
c331641e DM |
283 | endif::manvolnum[] |
284 | ||
d9c56b22 DM |
285 | Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`, |
286 | using the following configuration keys: | |
287 | ||
288 | include::pmg.mail-ports-conf-opts.adoc[] | |
289 | ||
c331641e | 290 | |
4a08dffe | 291 | [[pmgconfig_mailproxy_options]] |
c331641e DM |
292 | Options |
293 | ~~~~~~~ | |
294 | ||
c331641e | 295 | ifndef::manvolnum[] |
a695a527 | 296 | [thumbnail="pmg-gui-mailproxy-options.png", big=1] |
c331641e DM |
297 | endif::manvolnum[] |
298 | ||
e3d778e0 DM |
299 | Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`, |
300 | using the following configuration keys: | |
301 | ||
302 | include::pmg.mail-options-conf-opts.adoc[] | |
c331641e DM |
303 | |
304 | ||
89028579 SI |
305 | [[pmgconfig_mailproxy_before_after_queue]] |
306 | Before and After Queue scanning | |
307 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
308 | ||
309 | Scanning email can happen at two different stages of mail-processing: | |
310 | ||
1824eab9 SI |
311 | * Before-queue filtering: During the SMTP Session, after the complete message |
312 | has been received (after the 'DATA' command). | |
89028579 | 313 | |
1824eab9 SI |
314 | * After-queue filtering: After initially accepting the mail and putting it on |
315 | a queue for further processing. | |
89028579 | 316 | |
1824eab9 SI |
317 | Before-queue filtering has the advantage that the system can reject a mail (by |
318 | sending a permanent reject code '554'), and leave the task of notifying the | |
319 | original sender to the other mailserver. This is of particular advantage if | |
320 | the processed mail is a spam message or contains a virus and has a forged | |
89028579 SI |
321 | sender-address. Sending out a notification in this situation leads so-called |
322 | 'backscatter' mail, which might cause your server to get listed as spamming on | |
323 | RBLs. | |
324 | ||
1824eab9 SI |
325 | After-queue filtering has the advantage of providing faster delivery of |
326 | mails for the sending servers, since queueing mails is much faster than | |
327 | analyzing it for spam and viruses. | |
89028579 SI |
328 | |
329 | If a mail is addressed to multiple recipients (e.g. when multiple addresses are | |
330 | subscribed to the same mailinglist) the situation is more complicated: Your | |
331 | mailserver can only reject or accept the mail for all recipients, after having | |
332 | received the complete message, while your rule setup might accept the mail for | |
333 | part of the recipients and reject it for others. This can be due to a | |
334 | complicated rule setup, or if your users use the 'User White- and Blacklist' | |
335 | feature. | |
336 | ||
337 | If the resulting action of the rule system is the same for all recipients {pmg} | |
338 | responds accordingly if configured for before queue filtering (sending '554' | |
339 | for a blocked mail and '250' for an accepted or quarantined mail). If some | |
340 | mailboxes accept the mail and some reject it the system has to accept the mail. | |
341 | ||
342 | Whether {pmg} notifies the sender that delivery failed for some recipients by | |
343 | sending a non-delivery report, depends on the 'ndr_on_block' setting in | |
344 | '/etc/pmg/pmg.conf'. If enabled an NDR is sent. Keeping it disabled prevents | |
345 | NDRs being sent to the (possibly forged) sender and thus minimizes the chance | |
346 | of getting your IP listed on a RBL. However in certain environments it can be | |
347 | unacceptable not to inform the sender about a rejected mail. | |
348 | ||
349 | The setting has the same effect if after queue filtering is configured, with | |
350 | the exception that an NDR is always sent out, even if all recipients block the | |
351 | mail, since the mail already got accepted before being analyzed. | |
352 | ||
353 | The details of integrating the mail proxy with {postfix} in both setups are | |
354 | explained in {postfix_beforequeue} and {postfix_afterqueue} respectively. | |
355 | ||
356 | NOTE: Since before queue filtering is currently incompatible with the | |
357 | 'Tracking Center' you need to enable it by manually | |
358 | editing '/etc/pmg/pmg.conf'. | |
359 | ||
360 | ||
d41aa039 SI |
361 | [[pmgconfig_mailproxy_greylisting]] |
362 | Greylisting | |
363 | ~~~~~~~~~~~ | |
364 | ||
365 | Greylisting is a technique for preventing unwanted messages from reaching the | |
366 | resource intensive stages of content analysis (virus detection and spam | |
367 | detection): By initially replying with a temporary failure code ('450') to | |
368 | each new email, the {pmg} tells the sending server that it should queue the | |
369 | mail and retry delivery at a later moment. Since certain kinds of spam get | |
370 | sent out by software, which has no provisioning for queueing, these mails are | |
371 | dropped without reaching {pmg} or your mailbox. | |
372 | ||
373 | The downside of greylisting is the delay introduced by the initial deferral of | |
374 | the email, which usually amounts to less than 30 minutes. | |
375 | ||
376 | In order to prevent unnecessary delays in delivery from known sources, emails | |
377 | coming from a source for a recipient, which have passed greylisting in the | |
378 | past are directly passed on: For each email the triple '<sender network, | |
379 | sender email, recipient email>' is stored in a list, along with the time when | |
380 | delivery was attempted. If an email fits an already existing triple, the | |
381 | timestamp for that triple is updated and the email is accepted for further | |
382 | processing. | |
383 | ||
384 | As long as a sender and recipient do communicate frequently there is no delay | |
385 | introduced by enabling greylisting. A triple is removed after a longer period | |
386 | of time, when no mail fitting that triple has been seen. The timeouts in {pmg} | |
387 | are: | |
388 | ||
389 | * 2 days for the retry of the first delivery | |
390 | ||
391 | * 36 days for known triples | |
392 | ||
393 | Mails with an empty envelope-sender are always delayed. | |
394 | ||
395 | Some email service providers send out emails for one domain from multiple | |
396 | servers. To prevent delays due to an email coming in from 2 separate IPs of | |
397 | the same provider the triples store a network ('cidr') instead of a single IP. | |
398 | For certain large providers the default network size might be too small. You | |
399 | can configure the netmask applied to an IP for the greylist lookup in | |
400 | '/etc/pmg/pmg.conf' or in the GUI with the settings 'greylistmask' for IPv4 | |
401 | and 'greylistmask6' for IPv6 respectively. | |
402 | ||
403 | ||
4a08dffe | 404 | [[pmgconfig_mailproxy_transports]] |
c331641e DM |
405 | Transports |
406 | ~~~~~~~~~~ | |
407 | ||
408 | ifndef::manvolnum[] | |
a695a527 | 409 | [thumbnail="pmg-gui-mailproxy-transports.png", big=1] |
c331641e DM |
410 | endif::manvolnum[] |
411 | ||
b335e06b DM |
412 | You can use {pmg} to send e-mails to different internal |
413 | e-mail servers. For example you can send e-mails addressed to | |
414 | domain.com to your first e-mail server, and e-mails addressed to | |
415 | subdomain.domain.com to a second one. | |
416 | ||
31259590 JZ |
417 | You can add the IP addresses, hostname, transport protocol (smtp/lmtp), |
418 | transport ports and mail domains (or just single email addresses) | |
419 | of your additional e-mail servers. When transport protocol is set to `lmtp`, | |
420 | the option 'Use MX' is useless and will be automatically set to 'No'. | |
c331641e DM |
421 | |
422 | ||
4a08dffe | 423 | [[pmgconfig_mailproxy_networks]] |
c331641e DM |
424 | Networks |
425 | ~~~~~~~~ | |
426 | ||
427 | ifndef::manvolnum[] | |
a695a527 | 428 | [thumbnail="pmg-gui-mailproxy-networks.png", big=1] |
c331641e DM |
429 | endif::manvolnum[] |
430 | ||
20e879ad DM |
431 | You can add additional internal (trusted) IP networks or hosts. |
432 | All hosts in this list are allowed to relay. | |
433 | ||
434 | NOTE: Hosts in the same subnet with Proxmox can relay by default and | |
435 | it’s not needed to add them in this list. | |
c331641e DM |
436 | |
437 | ||
4a08dffe | 438 | [[pmgconfig_mailproxy_tls]] |
c331641e DM |
439 | TLS |
440 | ~~~ | |
441 | ||
442 | ifndef::manvolnum[] | |
a695a527 | 443 | [thumbnail="pmg-gui-mailproxy-tls.png", big=1] |
c331641e DM |
444 | endif::manvolnum[] |
445 | ||
20e879ad DM |
446 | Transport Layer Security (TLS) provides certificate-based |
447 | authentication and encrypted sessions. An encrypted session protects | |
448 | the information that is transmitted with SMTP mail. When you activate | |
449 | TLS, {pmg} automatically generates a new self signed | |
450 | certificate for you (`/etc/pmg/pmg-tls.pem`). | |
451 | ||
37b2b051 | 452 | {pmg} uses opportunistic TLS encryption by default. The SMTP transaction is |
20e879ad | 453 | encrypted if the 'STARTTLS' ESMTP feature is supported by the remote |
37b2b051 | 454 | server. Otherwise, messages are sent in the clear. |
91d501f6 SI |
455 | |
456 | You can set a different TLS policy per destination. A destination is either a | |
457 | remote domain or a next-hop destination as specified in `/etc/pmg/transport`. | |
458 | This can be used, should you need to prevent e-mail delivery without | |
459 | encryption, or to work around a broken 'STARTTLS' ESMTP implementation. See | |
460 | {postfix_tls_readme} for details on the supported policies. | |
20e879ad DM |
461 | |
462 | Enable TLS logging:: | |
463 | ||
464 | To get additional information about SMTP TLS activity you can enable | |
465 | TLS logging. That way information about TLS sessions and used | |
466 | certificate’s is logged via syslog. | |
467 | ||
468 | Add TLS received header:: | |
469 | ||
470 | Set this option to include information about the protocol and cipher | |
471 | used as well as the client and issuer CommonName into the "Received:" | |
472 | message header. | |
473 | ||
a649b38f DM |
474 | Those settings are saved to subsection 'mail' in `/etc/pmg/pmg.conf`, |
475 | using the following configuration keys: | |
476 | ||
477 | include::pmg.mail-tls-conf-opts.adoc[] | |
478 | ||
c331641e | 479 | |
20522d96 SI |
480 | [[pmgconfig_mailproxy_dkim]] |
481 | DKIM Signing | |
482 | ~~~~~~~~~~~~ | |
483 | ||
f5fddbff | 484 | ifndef::manvolnum[] |
a695a527 | 485 | [thumbnail="pmg-gui-mailproxy-dkim.png", big=1] |
f5fddbff SI |
486 | endif::manvolnum[] |
487 | ||
20522d96 SI |
488 | DomainKeys Identified Mail (DKIM) Signatures (see {dkim_rfc}) is a method to |
489 | cryptographically authenticate a mail as originating from a particular domain. | |
490 | Before sending the mail a hash over certain header fields and the body is | |
491 | computed, signed with a private key and added in the `DKIM-Signature` header of | |
492 | the mail. The 'selector' (a short identifier chosen by you, used to identify | |
493 | which system and private key were used for signing) is also included in the | |
494 | `DKIM-Signature` header. | |
495 | ||
496 | The verification is done by the receiver: The public key is fetched | |
497 | via DNS TXT lookup for `yourselector._domainkey.yourdomain.example` and used | |
498 | for verifying the hash. You can publish multiple selectors for your domain, | |
499 | each use by a system which sends e-mail from your domain, without the need to | |
500 | share the private key. | |
501 | ||
502 | {pmg} verifies DKIM Signatures for inbound mail in the Spam Filter by default. | |
503 | ||
504 | Additionally it supports conditionally signing outbound mail if configured. | |
505 | It uses one private key and selector per PMG deployment (all nodes in a cluster | |
506 | use the same key). The key has a minimal size of 1024 bits and rsa-sha256 is | |
507 | used as signing algorithm. | |
508 | ||
509 | The headers included in the signature are taken from the list of | |
510 | `Mail::DKIM::Signer`. Additionally `Content-Type` (if present), `From`, `To`, | |
511 | `CC`, `Reply-To` and `Subject` get oversigned. | |
512 | ||
513 | You can either sign all mails received on the internal port using the domain of | |
514 | the envelope sender address or create a list of domains, for which e-mails | |
515 | should be signed, defaulting to the list of relay domains. | |
516 | ||
517 | ||
518 | Enable DKIM Signing:: | |
519 | ||
520 | Controls whether outbound mail should get DKIM signed. | |
521 | ||
522 | Selector:: | |
523 | ||
524 | The selector used for signing the mail. The private key used for signing is | |
3fe91910 | 525 | saved under `/etc/pmg/dkim/yourselector.private`. You can display the DNS TXT |
20522d96 SI |
526 | record which you need to add to all domains signed by {pmg} by clicking on the |
527 | 'View DNS Record' Button. | |
528 | ||
529 | Sign all Outgoing Mail:: | |
530 | ||
531 | Controls whether all outbound mail should get signed or only mails from domains | |
532 | listed in `/etc/pmg/dkim/domains` if it exists and `/etc/pmg/domains` otherwise. | |
533 | ||
534 | Those settings are saved to subsection 'admin' in `/etc/pmg/pmg.conf`, | |
535 | using the following configuration keys: | |
536 | ||
537 | include::pmg.admin-dkim-conf-opts.adoc[] | |
538 | ||
539 | ||
c331641e DM |
540 | Whitelist |
541 | ~~~~~~~~~ | |
542 | ||
543 | ifndef::manvolnum[] | |
a695a527 | 544 | [thumbnail="pmg-gui-mailproxy-whitelist.png", big=1] |
c331641e DM |
545 | endif::manvolnum[] |
546 | ||
6822b369 DM |
547 | All SMTP checks are disabled for those entries (e. g. Greylisting, |
548 | SPF, RBL, ...) | |
549 | ||
550 | NOTE: If you use a backup MX server (e.g. your ISP offers this service | |
551 | for you) you should always add those servers here. | |
c331641e DM |
552 | |
553 | ||
4a08dffe | 554 | [[pmgconfig_spamdetector]] |
c331641e DM |
555 | Spam Detector Configuration |
556 | --------------------------- | |
557 | ||
2d672352 DM |
558 | Options |
559 | ~~~~~~~ | |
560 | ||
74bfe8ba | 561 | ifndef::manvolnum[] |
a695a527 | 562 | [thumbnail="pmg-gui-spam-options.png", big=1] |
74bfe8ba DM |
563 | endif::manvolnum[] |
564 | ||
3371c521 DM |
565 | {pmg} uses a wide variety of local and network tests to identify spam |
566 | signatures. This makes it harder for spammers to identify one aspect | |
567 | which they can craft their messages to work around the spam filter. | |
568 | ||
569 | Every single e-mail will be analyzed and gets a spam score | |
570 | assigned. The system attempts to optimize the efficiency of the rules | |
571 | that are run in terms of minimizing the number of false positives and | |
572 | false negatives. | |
573 | ||
574 | include::pmg.spam-conf-opts.adoc[] | |
575 | ||
576 | ||
4a08dffe | 577 | [[pmgconfig_spamdetector_quarantine]] |
2d672352 DM |
578 | Quarantine |
579 | ~~~~~~~~~~ | |
3371c521 | 580 | |
74bfe8ba | 581 | ifndef::manvolnum[] |
a695a527 | 582 | [thumbnail="pmg-gui-spamquar-options.png", big=1] |
74bfe8ba DM |
583 | endif::manvolnum[] |
584 | ||
3371c521 DM |
585 | Proxmox analyses all incoming e-mail messages and decides for each |
586 | e-mail if its ham or spam (or virus). Good e-mails are delivered to | |
587 | the inbox and spam messages can be moved into the spam quarantine. | |
588 | ||
589 | The system can be configured to send daily reports to inform users | |
590 | about the personal spam messages received the last day. That report is | |
591 | only sent if there are new messages in the quarantine. | |
592 | ||
ee34edb0 DC |
593 | Some options are only available in the config file `/etc/pmg/pmg.conf`, |
594 | and not in the webinterface. | |
595 | ||
3371c521 | 596 | include::pmg.spamquar-conf-opts.adoc[] |
c331641e DM |
597 | |
598 | ||
36b169e6 SI |
599 | [[pmgconfig_spamdetector_customscores]] |
600 | Customization of Rulescores | |
601 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
602 | ||
f5fddbff | 603 | ifndef::manvolnum[] |
a695a527 | 604 | [thumbnail="pmg-gui-spam-custom-scores.png", big=1] |
f5fddbff SI |
605 | endif::manvolnum[] |
606 | ||
36b169e6 SI |
607 | While the default scoring of {spamassassin}'s ruleset provides very good |
608 | detection rates, sometimes your particular environment can benefit from | |
609 | slightly adjusting the score of a particular rule. Two examples: | |
610 | ||
611 | * Your system receives spam mails which are scored at 4.9 and you have | |
612 | a rule which puts all mails above 5 in the quarantine. The one thing the | |
613 | spam mails have in common is that they all hit 'URIBL_BLACK'. By increasing | |
614 | the score of this rule by 0.2 points the spam mails would all be quarantined | |
615 | instead of being sent to your users | |
616 | ||
617 | * Your system tags many legitimate mails from a partner organization as spam, | |
618 | because the organization has a policy that each mail has to start with | |
619 | 'Dear madam or sir' (generating 1.9 points through the rule | |
620 | 'DEAR_SOMETHING'). By setting the score of this rule to 0 you can disable | |
621 | it completely. | |
622 | ||
623 | The system logs all rules which particular mail hits. Analyzing the logs can | |
624 | lead to finding such a pattern in your environment. | |
625 | ||
626 | You can adjust the score of a rule by creating a new 'Custom Rule Score' entry | |
627 | in the GUI. | |
628 | ||
629 | NOTE: In general it is strongly recommended to not make large changes to the | |
630 | default scores. | |
631 | ||
632 | ||
4a08dffe | 633 | [[pmgconfig_clamav]] |
c331641e DM |
634 | Virus Detector Configuration |
635 | ---------------------------- | |
636 | ||
4a08dffe | 637 | [[pmgconfig_clamav_options]] |
2d672352 DM |
638 | Options |
639 | ~~~~~~~ | |
640 | ||
e7c18c7c | 641 | ifndef::manvolnum[] |
a695a527 | 642 | [thumbnail="pmg-gui-virus-options.png", big=1] |
e7c18c7c DM |
643 | endif::manvolnum[] |
644 | ||
0bfbbf88 DM |
645 | All mails are automatically passed to the included virus detector |
646 | ({clamav}). The default setting are considered safe, so it is usually | |
647 | not required to change them. | |
648 | ||
649 | {clamav} related settings are saved to subsection 'clamav' in `/etc/pmg/pmg.conf`, | |
650 | using the following configuration keys: | |
651 | ||
652 | include::pmg.clamav-conf-opts.adoc[] | |
653 | ||
e7c18c7c | 654 | ifndef::manvolnum[] |
a695a527 | 655 | [thumbnail="pmg-gui-clamav-database.png", big=1] |
e7c18c7c DM |
656 | endif::manvolnum[] |
657 | ||
658 | Please note that the virus signature database it automatically | |
659 | updated. But you can see the database status on the GUI, and you can | |
660 | trigger manual updates there. | |
661 | ||
0bfbbf88 | 662 | |
4a08dffe | 663 | [[pmgconfig_clamav_quarantine]] |
2d672352 DM |
664 | Quarantine |
665 | ~~~~~~~~~~ | |
0bfbbf88 | 666 | |
e7c18c7c | 667 | ifndef::manvolnum[] |
a695a527 | 668 | [thumbnail="pmg-gui-virusquar-options.png", big=1] |
e7c18c7c DM |
669 | endif::manvolnum[] |
670 | ||
0bfbbf88 DM |
671 | Indentified virus mails are automatically moved to the virus |
672 | quarantine. The administartor can view those mails using the GUI, or | |
673 | deliver them in case of false positives. {pmg} does not notify | |
674 | individual users about received virus mails. | |
675 | ||
676 | Virus quarantine related settings are saved to subsection 'virusquar' | |
677 | in `/etc/pmg/pmg.conf`, using the following configuration keys: | |
678 | ||
679 | include::pmg.virusquar-conf-opts.adoc[] | |
c331641e DM |
680 | |
681 | ||
7eff8815 DM |
682 | Custom SpamAssassin configuration |
683 | --------------------------------- | |
684 | ||
833e1edc SI |
685 | This is only for advanced users. {spamassassin}'s rules and their associated |
686 | scores get updated regularly and are trained on a huge corpus, which gets | |
687 | classified by experts. In most cases adding a rule for matching a particular | |
688 | keyword is the wrong approach, leading to many false positives. Usually bad | |
689 | detection rates are better addressed by properly setting up DNS than by adding | |
690 | a custom rule - watch out for matches to 'URIBL_BLOCKED' in the logs or | |
691 | spam-headers - see the {spamassassin_dnsbl}. | |
692 | ||
693 | To add or change the Proxmox {spamassassin} configuration please login to the | |
d2f49775 TL |
694 | console via SSH. Change to the `/etc/mail/spamassassin/` directory. In this |
695 | directory there are several files (`init.pre`, `local.cf`, ...) - do not change | |
69a428d9 SI |
696 | them, as `init.pre`, `v310.pre`, `v320.pre`, `local.cf` will be overwritten by |
697 | the xref:pmgconfig_template_engine[template engine], while the others can | |
698 | get updated by any {spamassassin} package upgrade. | |
833e1edc SI |
699 | |
700 | To add your special configuration, you have to create a new file and name it | |
d2f49775 TL |
701 | `custom.cf` (in this directory), then add your configuration there. Make sure |
702 | to use the correct {spamassassin} syntax, and test with | |
7eff8815 DM |
703 | |
704 | ---- | |
705 | # spamassassin -D --lint | |
706 | ---- | |
707 | ||
708 | If you run a cluster, the `custom.cf` file is synchronized from the | |
d2f49775 | 709 | master node to all cluster members automatically. |
7eff8815 | 710 | |
36b169e6 SI |
711 | Should you only wish to adjust the score assigned to a particular rule you |
712 | can also use the xref:pmgconfig_spamdetector_customscores[Custom Rule Score] | |
713 | settings in the GUI. | |
714 | ||
7eff8815 | 715 | |
ed7970d8 SI |
716 | [[pmgconfig_custom_check]] |
717 | Custom Check Interface | |
718 | ---------------------- | |
719 | ||
720 | For use cases which are not handled by the {pmg} Virus Detector and | |
721 | {spamassassin} configuration, advanced users can create a custom check | |
722 | executable which, if enabled will be called before the Virus Detector and before | |
723 | passing an e-mail through the Rule System. The custom check API is kept as | |
724 | simple as possible, while still providing a great deal of control over the | |
725 | treatment of an e-mail. Its input is passed via two CLI arguments: | |
726 | ||
727 | * the 'api-version' (currently `v1`) - for potential future change of the | |
728 | invocation | |
729 | ||
730 | * the 'queue-file-name' - a filename, which contains the complete e-mail as | |
731 | rfc822/eml file | |
732 | ||
733 | The expected output need to be printed on STDOUT and consists of two lines: | |
734 | ||
735 | * the 'api-version' (currently 'v1') - see above | |
736 | ||
737 | * one of the following 3 results: | |
738 | ** 'OK' - e-mail is ok | |
739 | ** 'VIRUS: <virusdescription>' - e-mail is treated as if it contained a virus | |
740 | (the virusdescription is logged and added to the e-mail's headers) | |
741 | ** 'SCORE: <number>' - <number> is added (negative numbers are also possible) | |
742 | to the e-mail's spamscore | |
743 | ||
744 | The check is run with a 5 minute timeout - if it is exceeded the check | |
745 | executable is killed and the e-mail is treated as OK. | |
746 | ||
747 | All output written to STDERR by the check is written with priority 'err' to the | |
748 | journal/mail.log. | |
749 | ||
750 | A simple sample script following the API (and yielding a random result) for | |
751 | reference: | |
752 | ||
753 | ---- | |
754 | #!/bin/sh | |
755 | ||
756 | echo "called with $*" 1>&2 | |
757 | ||
758 | if [ "$#" -ne 2 ]; then | |
759 | echo "usage: $0 APIVERSION QUEUEFILENAME" 1>&2 | |
760 | exit 1 | |
761 | fi | |
762 | ||
763 | apiver="$1" | |
764 | shift | |
765 | ||
766 | if [ "$apiver" != "v1" ]; then | |
767 | echo "wrong APIVERSION: $apiver" 1>&2 | |
768 | exit 2 | |
769 | fi | |
770 | ||
771 | queue_file="$1" | |
772 | ||
773 | echo "v1" | |
774 | ||
775 | choice=$(shuf -i 0-3 -n1) | |
776 | ||
777 | case "$choice" in | |
778 | 0) | |
779 | echo OK | |
780 | ;; | |
781 | 1) | |
782 | echo SCORE: 4 | |
783 | ;; | |
784 | 2) | |
785 | echo VIRUS: Random Virus | |
786 | ;; | |
787 | 3) #timeout-test | |
788 | for i in $(seq 1 7); do | |
789 | echo "custom checking mail: $queue_file - minute $i" 1>&2 | |
790 | sleep 60 | |
791 | done | |
792 | ;; | |
793 | esac | |
794 | ||
795 | exit 0 | |
796 | ---- | |
797 | ||
798 | The custom check needs to be enabled in the admin section of `/etc/pmg/pmg.conf` | |
799 | ||
800 | ---- | |
801 | section: admin | |
802 | custom_check 1 | |
803 | ---- | |
804 | ||
805 | The location of the custom check executable can also be set there with the key | |
806 | `custom_check_path` and defaults to `/usr/local/bin/pmg-custom-check`. | |
807 | ||
808 | ||
c331641e DM |
809 | User Management |
810 | --------------- | |
811 | ||
05336835 DC |
812 | User management in {pmg} consists of three types of users/accounts: |
813 | ||
814 | ||
4a08dffe | 815 | [[pmgconfig_localuser]] |
05336835 DC |
816 | Local Users |
817 | ~~~~~~~~~~~ | |
818 | ||
a695a527 | 819 | [thumbnail="pmg-gui-local-user-config.png", big=1] |
f02d2b90 | 820 | |
05336835 DC |
821 | Local users are used to manage and audit {pmg}. Those users can login on the |
822 | management web interface. | |
823 | ||
824 | There are three roles: | |
825 | ||
826 | * Administrator | |
827 | + | |
828 | Is allowed to manage settings of {pmg}, except some tasks like | |
829 | network configuration and upgrading. | |
830 | ||
831 | * Quarantine manager | |
832 | + | |
833 | Is allowed to manage quarantines, blacklists and whitelists, but not other | |
834 | settings. Has no right to view any other data. | |
835 | ||
836 | * Auditor | |
837 | + | |
838 | With this role, the user is only allowed to view data and configuration, but | |
839 | not to edit it. | |
840 | ||
841 | In addition there is always the 'root' user, which is used to perform special | |
842 | system administrator tasks, such as updgrading a host or changing the | |
843 | network configuration. | |
844 | ||
845 | NOTE: Only pam users are able to login via the webconsole and ssh, which the | |
846 | users created with the web interface are not. Those users are created for | |
847 | {pmg} administration only. | |
848 | ||
849 | Local user related settings are saved in `/etc/pmg/user.conf`. | |
850 | ||
851 | For details of the fields see xref:pmg_user_configuration_file[user.conf] | |
852 | ||
4a08dffe | 853 | [[pmgconfig_ldap]] |
05336835 DC |
854 | LDAP/Active Directory |
855 | ~~~~~~~~~~~~~~~~~~~~~ | |
856 | ||
a695a527 | 857 | [thumbnail="pmg-gui-ldap-user-config.png", big=1] |
f02d2b90 | 858 | |
05336835 DC |
859 | You can specify multiple LDAP/Active Directory profiles, so that you can |
860 | create rules matching those users and groups. | |
861 | ||
862 | Creating a profile requires (at least) the following: | |
863 | ||
864 | * profile name | |
865 | * protocol (LDAP or LDAPS; LDAPS is recommended) | |
866 | * at least one server | |
867 | * a user and password (if your server does not support anonymous binds) | |
868 | ||
869 | All other fields should work with the defaults for most setups, but can be | |
870 | used to customize the queries. | |
871 | ||
872 | The settings are saved to `/etc/pmg/ldap.conf`. Details for the options | |
873 | can be found here: xref:pmg_ldap_configuration_file[ldap.conf] | |
874 | ||
875 | Bind user | |
876 | ^^^^^^^^^ | |
877 | ||
878 | It is highly recommended that the user which you use for connecting to the | |
879 | LDAP server only has the permission to query the server. For LDAP servers | |
880 | (for example OpenLDAP or FreeIPA), the username has to be of a format like | |
881 | 'uid=username,cn=users,cn=accounts,dc=domain' , where the specific fields are | |
882 | depending on your setup. For Active Directory servers, the format should be | |
883 | like 'username@domain' or 'domain\username'. | |
884 | ||
885 | Sync | |
886 | ^^^^ | |
887 | ||
888 | {pmg} synchronizes the relevant user and group info periodically, so that | |
889 | that information is available in a fast manner, even when the LDAP/AD server | |
890 | is temporarily not accessible. | |
891 | ||
892 | After a successfull sync, the groups and users should be visible on the web | |
893 | interface. After that, you can create rules targeting LDAP users and groups. | |
c331641e DM |
894 | |
895 | ||
4a08dffe | 896 | [[pmgconfig_fetchmail]] |
8538d9a2 | 897 | Fetchmail |
05336835 DC |
898 | ~~~~~~~~~ |
899 | ||
a695a527 | 900 | [thumbnail="pmg-gui-fetchmail-config.png", big=1] |
f02d2b90 | 901 | |
05336835 DC |
902 | Fetchmail is utility for polling and forwarding e-mails. You can define |
903 | e-mail accounts, which will then be fetched and forwarded to the e-mail | |
904 | address you defined. | |
905 | ||
906 | You have to add an entry for each account/target combination you want to | |
907 | fetch and forward. Those will then be regularly polled and forwarded, | |
908 | according to your configuration. | |
909 | ||
910 | The API and web interface offer following configuration options: | |
8538d9a2 DM |
911 | |
912 | include::fetchmail.conf.5-opts.adoc[] | |
913 | ||
914 | ||
e62ceaf0 DM |
915 | ifdef::manvolnum[] |
916 | include::pmg-copyright.adoc[] | |
917 | endif::manvolnum[] | |
918 |