2 # -*- eval: (outline-minor-mode); -*-
4 # Copyright (C) 2019 Ian Kelling
5 # SPDX-License-Identifier: AGPL-3.0-or-later
7 if [ -z "$BASH_VERSION" ]; then echo "error: shell is not bash" >&2; exit 1; fi
10 m
() { printf "$pre %s\n" "$*"; "$@"; }
11 e
() { printf "$pre %s\n" "$*"; }
12 err
() { echo "[$(date +'%Y-%m-%d %H:%M:%S%z')]: $0: $*" >&2; }
16 if [[ -s /usr
/local
/lib
/err
]]; then
17 source /usr
/local
/lib
/err
18 elif [[ -s /a
/bin
/errhandle
/err
]]; then
19 source /a
/bin
/errhandle
/err
21 err
"no err tracing script found"
25 [[ $EUID == 0 ]] ||
exec sudo
-E "${BASH_SOURCE[0]}" "$@"
26 if [[ ! $SUDO_USER ]]; then
27 echo "$0: error: requires running as nonroot or sudo"
36 Setup exim4 & dovecot & related things
38 -h|--help Print help and exit.
45 ####### instructions for icedove #####
46 # Incoming mail server: mail.iankelling.org, port 143, username iank, connection security starttls, authentication method normal password
47 # we could also just use 127.0.0.1 with no ssl, but todo: disable that in dovecot, so mail is secure from local programs.
49 # hamburger -> preferences -> preferences -> advanced tab -> config editor button -> security.ssl.enable_ocsp_must_staple = false
50 # background: ovecot does not yet have ocsp stapling support
51 # reference: https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921
53 # for phone, k9mail, same thing but username alerts, pass in ivy-pass.
54 # also, l2.b8.nz for secondary alerts
55 # fetching mail settings: folder poll frequency 10 minutes
59 # * perstent password instructions
61 # # for hosts which have all private files I just use the same user
62 # # for other hosts, each one get\'s their own password.
63 # # for generating secure pass, and storing for server too:
65 # I use $HOSTNAME as username
66 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
67 # s sed -i "/^$HOSTNAME:/d" /p/c/filesystem/etc/exim4/passwd
68 # echo "$HOSTNAME:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
69 # reference: exim4_passwd_client(5)
70 # echo "mail.iankelling.org:$HOSTNAME:$(<$f)" > /p/c/machine_specific/$HOSTNAME/filesystem/etc/exim4/passwd.client
71 # # then run this script
73 # # dovecot password, i just need 1 as I\'m the only user
74 # mkdir /p/c/filesystem/etc/dovecot
75 # echo "iank:$(doveadm pw -s ssha256)::::::" >>/p/c/filesystem/etc/dovecot/users
77 ####### end perstent password instructions ######
80 # * persistent dkim/dns instructions
81 # # Remove 1 level of comments in this section, set the domain var
82 # # for the domain you are setting up, then run this and copy dns settings
84 # domain=iankelling.org
85 # c /p/c/filesystem/etc/exim4
86 # # this has several bugs addressed in comments, but it was helpful
87 # # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
89 # openssl genrsa -out $domain-private.pem 2048 -outform PEM
90 # openssl rsa -in $domain-private.pem -out $domain.pem -pubout -outform PEM
91 # # selector is needed for having multiple keys for one domain.
92 # # I dun do that, so just use a static one: li
93 # echo "txt record name: li._domainkey.$domain"
94 # # Debadmin page does not have v=, fastmail does, and this
95 # # says it\'s recommended in 3.6.1, default is DKIM1 anyways.
96 # # https://www.ietf.org/rfc/rfc6376.txt
97 # # Join and print all but first and last line.
98 # # last line: swap hold & pattern, remove newlines, print.
99 # # lines 2+: append to hold space
100 # echo "txt record contents:"
101 # echo "v=DKIM1; k=rsa; p=$(sed -n '${x;s/\n//gp};2,$H' $domain.pem)"
102 # # selector was also put into /etc/exim4/conf.d/main/000_local,
104 # # 2017-02 dmarc policies:
105 # # host -t txt _dmarc.gmail.com
106 # # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
107 # # there were articles claiming gmail would be changing
108 # # to p=reject, in early 2017, which didn\'t happen. I see no sources on them. It\'s
109 # # expected to cause problems
110 # # with a few old mailing lists, copying theirs for now.
112 # echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
114 # # 2017-02 spf policies:
115 # # host -t txt lists.fedoraproject.org
116 # # google ~all, hotmail ~all, yahoo: ?all, fastmail ?all, outlook ~all
117 # # i include fastmail\'s settings, per their instructions,
118 # # and follow their policy. In mail in a box, or similar instructions,
119 # # I\'ve seen recommended to not use a restrictive policy.
121 # # to check if dns has updated, you do
122 # host -a mesmtp._domainkey.$domain
125 # # setting it to iankelling.org would work the same, but this
126 # # is more flexible, I could change where mail.iankelling.org pointed.
128 # mx records, 2 records each, for * and empty domain
129 # pri 10 mail.iankelling.org
131 ####### end persistent dkim instructions #########
134 # * functions constants
135 e
() { printf "%s\n" "$*"; }
136 pi
() { # package install without starting daemons
138 if dpkg
-s -- "$@" &> /dev
/null
; then
141 while fuser
/var
/lib
/dpkg
/lock
&>/dev
/null
; do sleep 1; done
142 f
=/var
/cache
/apt
/pkgcache.bin
;
143 if [[ ! -r $f ]] ||
(( $
(( $
(date +%s
) - $
(stat
-c %Y
$f ) )) > 60*60*12 )); then
146 f
=/usr
/sbin
/policy-rc.d
147 dd of
=$f 2>/dev
/null
<<EOF
153 DEBIAN_FRONTEND
=noninteractive m apt-get
-y install --purge --auto-remove "$@" || ret
=$?
156 err-exit
$ret "failed apt-get install above"
161 mxhost
=mail.iankelling.org
165 # old setup. left as comment for example
166 # mxhost=mail.messagingengine.com
168 # forward=ian@iankelling.org
170 smarthost
="$mxhost::$mxport"
172 ## * Install packages
173 # light version of exim does not have sasl auth support.
174 pi exim4-daemon-heavy spamassassin spf-tools-perl dnsmasq openvpn
175 # our nostart pi fails to avoid enabling
176 sudo systemctl disable openvpn
178 # trisquel 8 = openvpn, debian stretch = openvpn-client
179 vpn_ser
=openvpn-client
180 if [[ ! -e /lib
/systemd
/system
/openvpn-client@.service
]]; then
184 uhome
=$
(eval echo ~
$u)
185 ### * user forward file
189 # afaik, these will get ignored on MAIL_HOST because they are routing to my own
190 # machine, but rm them is safer
191 rm -fv $uhome/.forward
/root
/.forward
194 # this can\'t be a symlink and has permission restrictions
195 # it might work in /etc/aliases, but this seems more proper.
196 e setting
$uhome/.forward to
$forward
197 install -m 644 {-o,-g}$u <(e
$forward) $uhome/.forward
201 # * Mail clean cronjob
203 cat >/etc
/systemd
/system
/mailclean.timer
<<'EOF'
205 Description=Run mailclean daily
211 WantedBy=timers.target
214 cat >/etc
/systemd
/system
/mailclean.service
<<EOF
216 Description=Delete and archive old mail files
217 After=multi-user.target
222 ExecStart=/a/bin/log-quiet/sysd-mail-once mailclean /a/bin/distro-setup/mailclean
225 systemctl daemon-reload
230 if [[ $HOSTNAME != "$MAIL_HOST" ]]; then
231 m systemctl stop spamassassin
232 m systemctl disable spamassassin
236 sed -i '/^\s*CRON\s*=/d' /etc
/default
/spamassassin
237 e CRON
=1 >>/etc
/default
/spamassassin
238 # just noticed this in the config file, seems like a good idea.
239 sed -i '/^\s*NICE\s*=/d' /etc
/default
/spamassassin
240 e
'NICE="--nicelevel 15"' >>/etc
/default
/spamassassin
242 m systemctl
enable spamassassin
243 m systemctl start spamassassin
244 m systemctl reload spamassassin
246 cat >/etc
/systemd
/system
/spamddnsfix.service
<<'EOF'
248 Description=spamd dns bug fix cronjob
252 ExecStart=/a/bin/distro-setup/spamd-dns-fix
254 # 2017-09, debian closed the bug on this saying upstream had fixed it.
255 # remove this when i\'m using the newer package, ie, debian 10, or maybe
257 cat >/etc
/systemd
/system
/spamddnsfix.timer
<<'EOF'
259 Description=run spamd bug fix script every 10 minutes
263 # the script looks back 9 minutes into the journal,
264 # it takes a second to run,
265 # so lets run every 9 minutes and 10 seconds.
269 WantedBy=timers.target
271 m systemctl daemon-reload
272 m systemctl restart spamddnsfix.timer
273 m systemctl
enable spamddnsfix.timer
275 fi # [[ $HOSTNAME != "$MAIL_HOST" ]]
276 ##### end spamassassin config
280 if [[ -e /p
/c
/filesystem
]]; then
281 # allow failure of these commands when our internet is down, they are likely not needed,
282 # we check that a valid cert is there already.
283 # to put the hostname in the known hosts
284 if ! ssh -o StrictHostKeyChecking
=no root@li.iankelling.org
:; then
285 # This just causes failure if our cert is going to expire in the next 30 days.
286 # Certs I generate last 10 years.
287 openssl x509
-checkend $
(( 60 * 60 * 24 * 30 )) -noout -in /etc
/openvpn
/mail.crt
289 # note, man openvpn implies we could just call mail-route on vpn startup/shutdown with
290 # systemd, buuut it can remake the tun device unexpectedly, i got this in the log
291 # after my internet was down for a bit:
292 # NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.
293 m
/a
/exe
/vpn-mk-client-cert
-b mail -n mail -s /b
/ds
/mail-route li.iankelling.org
299 f
=/usr
/local
/bin
/mail-cert-cron
303 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
305 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
307 f=/a/bin/bash_unpublished/source-state
311 if [[ $HOSTNAME != "$MAIL_HOST" ]]; then
314 local_mx=mail.iankelling.org
315 mkdir -p /etc/letsencrypt/live/$local_mx
316 chmod 700 /etc/letsencrypt/live
317 rsync_common="rsync -ogtL --chown=root:Debian-exim --chmod=640 root@li.iankelling.org:/etc/letsencrypt/live/$local_mx/"
318 # allow for temporary connection issues
319 ${rsync_common}fullchain.pem /etc/exim4/exim.crt ||:
320 ${rsync_common}privkey.pem /etc/exim4/exim.key ||:
321 if ! openssl x509 -checkend $(( 60 * 60 * 24 * 3 )) -noout -in /etc/exim4/exim.crt; then
322 echo "$0: error!: cert rsync failed and it will expire in less than 3 days"
329 cat >/etc
/systemd
/system
/mailcert.service
<<'EOF'
331 Description=Mail cert rsync
332 After=multi-user.target
336 ExecStart=/a/bin/log-quiet/sysd-mail-once mailcert /usr/local/bin/mail-cert-cron
339 cat >/etc
/systemd
/system
/mailcert.timer
<<'EOF'
341 Description=Run mail-cert once a day
347 WantedBy=timers.target
349 m systemctl daemon-reload
350 m systemctl start mailcert
351 m systemctl restart mailcert.timer
352 m systemctl
enable mailcert.timer
356 # * common exim4 config
357 source /a
/bin
/bash_unpublished
/source-state
359 if [[ ! $MAIL_HOST ]]; then
360 err
"\$MAIL_HOST not set"
363 m sudo gpasswd
-a iank adm
#needed for reading logs
366 ### make local bounces go to normal maildir
367 # local mail that bounces goes to /Maildir or /root/Maildir
368 dirs=(/m
/md
/bounces
/{cur
,tmp
,new
})
369 m mkdir
-p ${dirs[@]}
370 m chown iank
:iank
/m
/m
/md
371 m
ln -sfT /m
/md
/m
/iank
373 m chown
-R $u:Debian-exim
/m
/md
/bounces
374 m
chmod 775 ${dirs[@]}
375 m usermod
-a -G Debian-exim
$u
376 for d
in /Maildir
/root
/Maildir
; do
377 if [[ ! -L $d ]]; then
380 m
ln -sf -T /m
/md
/bounces
$d
383 # Note, even the server needs permissions of this file right
384 # if it exists, so do this up here.
385 f
=/p
/c
/filesystem
/etc
/exim
4/passwd.client
386 if [[ ! -e $f ]]; then
387 f
=/p
/c
/machine_specific
/$HOSTNAME/filesystem
/etc
/exim
4/passwd.client
389 m sudo rsync
-ahhi --chown=root
:Debian-exim
--chmod=0640 $f /etc
/exim
4/
391 # by default, only 10 days of logs are kept. increase that.
392 m
sed -ri 's/^(\s*rotate\s).*/\11000/' /etc
/logrotate.d
/exim4-base
395 ## https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
396 # i only need .forwards, so just doing that one.
397 cd /etc
/exim
4/conf.d
/router
398 b
=userforward_higher_priority
399 # replace the router name so it is unique
400 sed -r s
/^
\\S
+:/$b:/ 600_exim4-config_userforward
>175_
$b
403 rm -vf /etc
/exim
4/conf.d
/main
/000_localmacros
# old filename
404 cat >/etc
/exim
4/conf.d
/main
/000_local
<<EOF
405 MAIN_TLS_ENABLE = true
407 # debian exim config added this in 2016 or so?
408 # it's part of the smtp spec, to limit lines to 998 chars
409 # but a fair amount of legit mail does not adhere to it. I don't think
410 # this should be default, like it says in
411 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828801
412 # todo: the bug for introducing this was about headers, but
413 # the fix maybe is for all lines? one says gmail rejects, the
414 # other says gmail does not reject. figure out and open a new bug.
415 IGNORE_SMTP_LINE_LENGTH_LIMIT = true
418 MAIN_LOG_SELECTOR = +all
421 # normally empty, I set this so I can set the envelope address
422 # when doing mail redelivery to invoke filters. Also allows
423 # me exiqgrep and stuff.
424 MAIN_TRUSTED_GROUPS = $u
426 # default is 10. when exim has been down for a bit, fsf mailserver
427 # will do a big send in one connection, then exim decides to put
428 # the messages in the queue instead of delivering them, to avoid
429 # spawning too many delivery processes. Pretty sure my system
430 # can handle a lot more, but lets go with this.
431 smtp_accept_queue_per_connection = 100
438 # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
440 # The file is based on the outgoing domain-name in the from-header.
441 DKIM_DOMAIN = \${lc:\${domain:\$h_from:}}
443 DKIM_PRIVATE_KEY = \${if exists{/etc/exim4/\${dkim_domain}-private.pem} {/etc/exim4/\${dkim_domain}-private.pem}}
445 # most of the ones that gmail seems to use.
446 # Exim has horrible default of signing unincluded
447 # list- headers since they got mentioned in an
448 # rfc, but this messes up mailing lists, like gnu/debian which want to
449 # keep your dkim signature intact but add list- headers.
450 DKIM_SIGN_HEADERS = mime-version:in-reply-to:references:from:date:subject:to
453 rm -fv /etc
/exim
4/rcpt_local_acl
# old path
454 cat >/etc
/exim
4/conf.d
/rcpt_local_acl
<<'EOF'
455 # Only hosts we control send to @mail.iankelling.org, so make sure
456 # they are all authed.
457 # Note, if we wanted authed senders for all domains,
458 # we could make this condition in acl_check_mail
460 message = ian trusted domain recepient but no auth
462 domains = mail.iankelling.org
464 rm -fv /etc
/exim
4/data_local_acl
# old path
465 cat >/etc
/exim
4/conf.d
/data_local_acl
<<'EOF'
466 # Except for the "condition =", this was
467 # a comment in the check_data acl. The comment about this not
468 # being suitable is mostly bs. The only thing related I found was to
469 # add the condition =, cuz spamassassin has problems with big
470 # messages and spammers don't bother with big messages,
471 # but I've increased the size from 10k
472 # suggested in official docs, and 100k in the wiki example because
473 # those docs are rather old and I see a 110k spam message
474 # pretty quickly looking through my spam folder.
476 condition = ${if < {$message_size}{2000K}}
477 spam = Debian-exim:true
478 add_header = X-Spam_score: $spam_score\n\
479 X-Spam_score_int: $spam_score_int\n\
480 X-Spam_bar: $spam_bar\n\
481 X-Spam_report: $spam_report
484 # spf = pass:fail:softfail:none:neutral:permerror:temperror
485 # dmarc_status = reject:quarantine
486 # add_header = Reply-to: dmarctest@iankelling.org
489 cat >/etc
/exim
4/conf.d
/auth
/29_exim4-config_auth
<<'EOF'
490 # from 30_exim4-config_examples
495 server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
496 server_set_id = $auth2
498 .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
499 server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
503 cat >/etc
/exim
4/conf.d
/router
/900_exim4-config_local_user
<<'EOF'
504 ### router/900_exim4-config_local_user
505 #################################
507 # This router matches local user mailboxes. If the router fails, the error
508 # message is "Unknown user".
511 debug_print = "R: local_user for $local_part@$domain"
513 domains = +local_domains
514 # ian: commented this, in conjunction with a dovecot lmtp
515 # change so I get mail for all users.
518 transport = LOCAL_DELIVERY
519 cannot_route_message = Unknown user
521 cat >/etc
/exim
4/conf.d
/transport
/30_exim4-config_dovecot_lmtp
<<'EOF'
524 socket = /var/run/dovecot/lmtp
525 #maximum number of deliveries per batch, default 1
529 cat >/etc
/exim
4/host_local_deny_exceptions
<<'EOF'
534 cat >/etc
/exim
4/conf.d
/router
/190_exim4-config_fsfsmarthost
<<'EOF'
535 # smarthost for fsf mail
536 # ian: copied from /etc/exim4/conf.d/router/200_exim4-config_primary, and added senders = and
537 # replaced DCsmarthost with mail.fsf.org
539 debug_print = "R: smarthost for $local_part@$domain"
541 domains = ! +local_domains
543 transport = remote_smtp_smarthost
544 route_list = * mail.fsf.org byname
545 host_find_failed = ignore
546 same_domain_copy_routing = yes
551 cat >/etc
/exim
4/update-exim4.conf.conf
<<'EOF'
552 # default stuff, i havent checked if its needed
553 dc_minimaldns='false'
556 dc_use_split_config='true'
557 dc_local_interfaces=''
558 dc_mailname_in_oh='true'
564 # based on a little google and package search, just the dovecot
565 # packages we need instead of dovecot-common.
567 # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
568 # directly. The reason to do this is to use dovecot\'s sieve, which
569 # has extensions that allow it to be almost equivalent to exim\'s
570 # filter capabilities, some ways probably better, some worse, and
571 # sieve has the benefit of being supported in postfix and
572 # proprietary/weird environments, so there is more examples on the
573 # internet. I was torn about whether to do this or not, meh.
574 pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
576 for f
in /p
/c
{/machine_specific
/$HOSTNAME,}/filesystem
/etc
/dovecot
/users
; do
579 m sudo rsync
-ahhi --chown=root
:dovecot
--chmod=0640 $f /etc
/dovecot
/
583 for f
in /p
/c
/subdir_files
/sieve
/*sieve
/a
/c
/subdir_files
/sieve
/*sieve
; do
584 m sudo
-u $u /a
/exe
/lnf
-T $f $uhome/sieve
/${f##*/}
586 # If we changed 90-sieve.conf and removed the active part of the
587 # sieve option, we wouldn\'t need this, but I\'d rather not modify a
588 # default config if not needed. This won\'t work as a symlink in /a/c
590 if [[ -e $uhome/sieve
/personal.sieve
]]; then
591 m sudo
-u $u /a
/exe
/lnf
-T sieve
/main.sieve
$uhome/.dovecot.sieve
594 # we set this later in local.conf
595 sed -ri -f - /etc
/dovecot
/conf.d
/10-mail.conf
<<'EOF'
596 /^\s*mail_location\s*=/d
599 cat >/etc
/dovecot
/conf.d
/20-lmtp.conf
<<EOF
601 #per https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
602 mail_plugins = \$mail_plugins sieve
604 #mail_plugins = \$mail_plugins
606 # For a normal setup with exim, we need something like this, which
607 # removes the domain part
608 # auth_username_format = %Ln
610 # or else # Exim says something like
611 # "LMTP error after RCPT ... 550 ... User doesn't exist someuser@somedomain"
612 # Dovecot verbose log says something like
613 # "auth-worker(9048): passwd(someuser@somedomain): unknown user"
614 # reference: http://wiki.dovecot.org/LMTP/Exim
616 # However, I use this to direct all mail to the same inbox.
617 # A normal way to do this, which I did at first is to have
618 # a router in exim almost at the end, eg 950,
620 # debug_print = "R: catchall for \$local_part@\$domain"
622 # domains = +local_domains
625 # http://blog.alteholz.eu/2015/04/exim4-and-catchall-email-address/
626 # with superflous options removed.
627 # However, this causes the envelope to be rewritten,
628 # which makes filtering into mailboxes a little less robust or more complicated,
629 # so I've done it this way instead. it also requires
630 # modifying the local router in exim.
631 auth_username_format = $u
637 cat >/etc
/dovecot
/local.conf
<<EOF
638 # so I can use a different login that my shell login for mail. this is
639 # worth doing solely for the reason that if this login is compromised,
640 # it won't also compromise my shell password.
641 !include conf.d/auth-passwdfile.conf.ext
643 # settings derived from wiki and 10-ssl.conf
645 ssl_cert = </etc/exim4/exim.crt
646 ssl_key = </etc/exim4/exim.key
647 # https://github.com/certbot/certbot/raw/master/certbot-apache/certbot_apache/options-ssl-apache.conf
648 # in my cert cronjob, I check if that has changed upstream.
649 ssl_cipher_list = ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS
651 # ian: added this, more secure, per google etc
652 ssl_prefer_server_ciphers = yes
654 # ian: %u is used for alerts user vs iank
655 mail_location = maildir:/m/%u:LAYOUT=fs:INBOX=/m/%u/INBOX
659 # for debugging info, uncomment these.
660 # logs go to syslog and to /var/log/mail.log
664 ####### end dovecot-setup ########
676 sudo rsync
-ahhi --chown=root
:Debian-exim
--chmod=0640 \
677 /p
/c
/filesystem
/etc
/exim
4/passwd
/p
/c
/filesystem
/etc
/exim
4/*.pem
/etc
/exim
4/
680 # mail.iankelling.org so local imap clients can connect with tls and
681 # when they happen to not be local.
682 sed -ri -f - /etc
/hosts
<<'EOF'
683 /^127\.0\.1\.1.* mail\.iankelling\.org\b/{p;d}
684 /^127\.0\.1\.1 /s/ *$/ mail.iankelling.org/
687 # note: systemd-resolved will consult /etc/hosts, dnsmasq wont. this assumes
688 # weve configured this file in dnsmasq if we are using it.
689 /a
/exe
/cedit
mail /etc
/dnsmasq-servers.conf
<<'EOF' || [[ $? == 1 ]]
690 server=/mail.iankelling.org/127.0.1.1
692 if systemctl is-active dnsmasq
>/dev
/null
; then
693 m systemctl restart dnsmasq
697 # I used to use debconf-set-selections + dpkg-reconfigure,
698 # which then updates this file
699 # but the process is slower than updating it directly and then I want to set other things in
700 # update-exim4.conf.conf, so there's no point.
701 # The file is documented in man update-exim4.conf,
702 # except the man page is not perfect, read the bash script to be sure about things.
704 # The debconf questions output is additional documentation that is not
705 # easily accessible, but super long, along with the initial default comment in this
706 # file, so I've saved that into ./mail-notes.conf.
708 cat >>/etc
/exim
4/update-exim4.conf.conf
<<EOF
709 # note: some things we don't set that are here by default because they are unused.
711 dc_eximconfig_configtype='internet'
713 # man page: is used to build the local_domains list, together with "localhost"
714 # iank.bid is for testing
715 # mail.iankelling.org is for machines i own
716 dc_other_hostnames='*.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org;*.b8.nz;b8.nz'
719 # Is a list of domains for which we accept mail from anywhere on the Internet but which are not delivered locally, e.g.
720 # because this machine serves as secondary MX for these domains. Sets MAIN_RELAY_TO_DOMAINS.
721 # todo: we should not accept from anywhere, only the mx for fsf.
722 dc_relay_domains='*.fsf.org;fsf.org'
723 dc_localdelivery='dovecot_lmtp'
727 # the debconf output about mailname is as follows:
728 # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
730 # This name will also be used by other programs. It should be the single, fully
731 # qualified domain name (FQDN).
732 # Thus, if a mail address on the local host is foo@example.org, the correct value for
733 # this option would be example.org.
734 # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
736 echo mail.iankelling.org
> /etc
/mailname
738 # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
739 # smarthost config type, not sure. all other settings
740 # would be unused in that config type.
741 cat >>/etc
/exim
4/conf.d
/main
/000_local
<<EOF
742 # enable 587 in addition to the default 25, so that
743 # i can send mail where port 25 is firewalled by isp
744 daemon_smtp_ports = 25 : 587
748 # failing message on mail-tester.com:
749 # We check if there is a server (A Record) behind your hostname kd.
750 # You may want to publish a DNS record (A type) for the hostname kd or use a different hostname in your mail software
751 # https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
752 # and this one seemed appropriate from grepping config.
753 # I originally set this to li.iankelling.org, but then ended up with errors when li tried to send
754 # mail to kd, so this should basically be a name that no host has as their
755 # canonical hostname since the actual host sits behind a nat and changes.
756 # Seems logical for this to be the same as mailname.
757 MAIN_HARDCODE_PRIMARY_HOSTNAME = mail.iankelling.org
759 # options exim has to avoid having to alter the default config files
760 CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/conf.d/rcpt_local_acl
761 CHECK_DATA_LOCAL_ACL_FILE = /etc/exim4/conf.d/data_local_acl
764 # recommended if dns is expected to work
765 CHECK_RCPT_VERIFY_SENDER = true
766 # seems like a good idea
767 CHECK_DATA_VERIFY_HEADER_SENDER = true
768 CHECK_RCPT_SPF = true
769 CHECK_RCPT_REVERSE_DNS = true
770 CHECK_MAIL_HELO_ISSUED = true
773 #dmarc_tld_file = /etc/public_suffix_list.dat
776 f
=/etc
/cron.daily
/refresh-dmarc-tld-file
780 wget -q -N https://publicsuffix.org/list/public_suffix_list.dat
784 sed -i --follow-symlinks -f - /etc
/aliases
<<EOF
785 \$a root: $postmaster
790 # https://selivan.github.io/2017/12/30/systemd-serice-always-restart.html
791 d
=/etc
/systemd
/system
/openvpn@
mail.service.d
793 cat >$d/override.conf
<<'EOF'
796 # time to sleep before restarting a service
800 # StartLimitIntervalSec in recent systemd versions
803 if ! systemctl
cat openvpn@
mail.service|
grep -xF StartLimitInterval
=0 &>/dev
/null
; then
804 # needed for the above config to go into effect
805 m systemctl daemon-reexec
809 m systemctl
enable mailclean.timer
810 m systemctl start mailclean.timer
811 m systemctl restart
$vpn_ser@
mail
812 m systemctl
enable $vpn_ser@
mail
813 m systemctl
enable dovecot
814 m systemctl restart dovecot
817 *) # $HOSTNAME != $MAIL_HOST
818 # remove mail. uses 2 lines to properly remove whitespace
819 sed -ri -f - /etc
/hosts
<<'EOF'
820 s#^(127\.0\.1\.1 .*) +mail\.iankelling\.org$#\1#
821 s#^(127\.0\.1\.1 .*)mail\.iankelling\.org +(.*)#\1\2#
824 echo |
/a
/exe
/cedit
mail /etc
/dnsmasq-servers.conf ||
[[ $?
== 1 ]]
825 if systemctl is-active dnsmasq
>/dev
/null
; then
826 m systemctl restart dnsmasq
# reload does not ensure new config is used
830 m systemctl disable mailclean.timer
&>/dev
/null ||
:
831 m systemctl stop mailclean.timer
&>/dev
/null ||
:
832 m systemctl disable
$vpn_ser@
mail
833 m systemctl stop
$vpn_ser@
mail
836 # would only exist because I wrote it i the previous condition,
837 # it\'s not part of exim
838 rm -fv /etc
/exim
4/conf.d
/main
/000_localmacros
839 cat >>/etc
/exim
4/update-exim4.conf.conf
<<EOF
840 dc_eximconfig_configtype='smarthost'
841 dc_smarthost='$smarthost'
842 # The manpage incorrectly states this will do header rewriting, but
843 # that only happens if we have dc_hide_mailname is set.
844 dc_readhost='iankelling.org'
847 hostname
-f >/etc
/mailname
851 ## we use this host to monitor MAIL_HOST
854 m systemctl
enable dovecot
855 m systemctl restart dovecot
856 cat >>/etc
/exim
4/update-exim4.conf.conf
<<EOF
857 # man page: is used to build the local_domains list, together with "localhost"
858 # mail.iankelling.org is for machines i own
859 dc_other_hostnames='l2.b8.nz'
860 dc_localdelivery='dovecot_lmtp'
862 # This ends up at alerts mailbox on MAIL_HOST, but using a user that doesn't exist elsewhere
864 sed -i --follow-symlinks -f - /etc
/aliases
<<EOF
869 # not l2 and not MAIL_HOST
873 # This ends up at alerts mailbox on MAIL_HOST, but using a user that doesn't exist elsewhere
875 sed -i --follow-symlinks -f - /etc
/aliases
<<EOF
876 \$a root: root@mail.iankelling.org
879 cat >>/etc
/exim
4/update-exim4.conf.conf
<<EOF
880 # Only used in case of bounces.
881 dc_localdelivery='maildir_home'
883 m systemctl disable dovecot ||
:
884 m systemctl stop dovecot ||
:
886 esac # end $HOSTNAME != $MAIL_HOST
890 # ** bind mount setup
891 # put spool dir in directory that spans multiple distros.
892 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
894 # todo: I\'m suspicious of uids for Debian-exim being the same across
895 # distros. It would be good to test this.
897 sdir
=/var
/spool
/exim4
898 # we only do this if our system has $dir
900 # this used to do a symlink, but, in the boot logs, /nocow would get mounted succesfully,
901 # about 2 seconds later, exim starts, and immediately puts into paniclog:
902 # honVi-0000u3-82 Failed to create directory "/var/spool/exim4/input": No such file or directory
903 # so, im trying a bind mount to get rid of that.
904 if [[ -e /nocow
]]; then
905 if ! grep -Fx "/nocow/exim4 /var/spool/exim4 none bind 0 0" /etc
/fstab
; then
906 echo "/nocow/exim4 /var/spool/exim4 none bind 0 0" >>/etc
/fstab
908 if ! mountpoint
-q $sdir; then
909 m systemctl stop exim4
910 if [[ -L $sdir ]]; then
913 if [[ ! -e $dir && -d $sdir ]]; then
916 if [[ ! -d $sdir ]]; then
918 m
chmod 000 $sdir # only want it to be used when its mounted
926 # ** exim/spool uid setup
927 # i have the spool directory be common to distro multi-boot, so
928 # we need the uid to be the same. 608 cuz it's kind of in the middle
929 # of the free system uids.
930 IFS
=:; read -r _ _ uid _
< <(getent passwd Debian-exim ||
:) ||
:; unset IFS
931 IFS
=:; read -r _ _ gid _
< <(getent group Debian-exim ||
:) ||
:; unset IFS
932 if [[ ! $uid ]]; then
933 # from /var/lib/dpkg/info/exim4-base.postinst, plus uid and gid options
934 m adduser
--uid 608 --system --group --quiet --home /var
/spool
/exim4 \
935 --no-create-home --disabled-login --force-badname Debian-exim
936 elif [[ $uid != 608 ]]; then
937 m systemctl stop exim4 ||
:
938 m usermod
-u 608 Debian-exim
939 m groupmod
-g 608 Debian-exim
940 m usermod
-g 608 Debian-exim
941 m
find / /nocow
-path .
/var
/tmp
-prune -o -xdev -uid $uid -execdir chown
-h 608 {} +
942 m
find / /nocow
-path .
/var
/tmp
-prune -o -xdev -gid $gid -execdir chgrp
-h 608 {} +
950 if systemctl is-active exim4
>/dev
/null
; then
951 m systemctl reload exim4
953 m systemctl start exim4
957 # * mail monitoring / testing
961 # note: cronjob "ian" also does some important monitoring
962 cat >/etc
/cron.d
/mailtest
<<EOF
964 PATH=/usr/bin:/bin:/usr/local/bin
965 */5 * * * * $u send-test-forward |& log-once send-test-forward
966 */10 * * * * root chmod -R g+rw /m/md/bounces |& log-once -1 bounces-chmod
970 test_from
=ian@iankelling.org
971 test_to
=iank@posteo.de
973 cat >>/etc
/cron.d
/mailtest
<<EOF
974 */5 * * * * $u mailtest-check |& log-once -1 mailtest-check
975 2 * * * * $u check-remote-mailqs |& log-once check-remote-mailqs
977 m sudo rsync
-ahhi --chown=root
:root
--chmod=0755 \
978 /b
/ds
/mailtest-check
/b
/ds
/check-remote-mailqs
/usr
/local
/bin
/
981 test_from
=iank@l2.b8.nz
982 test_to
=testignore@iankelling.org
985 cat >/usr
/local
/bin
/send-test-forward
<<EOFOUTER
987 /usr/sbin/exim -t <<EOF
990 Subject: primary_test \$(date +%s) \$(date +%Y-%m-%dT%H:%M:%S%z)
995 m
chmod +x
/usr
/local
/bin
/send-test-forward
998 rm -fv /etc
/cron.d
/mailtest
1005 m sudo
-u $u ln -sf -T /m
/.mu
/home
/$u/.mu
1008 # /etc/alias setup is debian specific, and exim postinst script sets up
1009 # an /etc/alias from root to the postmaster, based on the question
1010 # exim4-config exim4/dc_postmaster, as long as there exists an entry for
1011 # root, or there was no preexisting aliases file. postfix won\'t set up
1012 # a root to $postmaster alias if it\'s already installed. Easiest to
1013 # just set it ourselves.
1015 # debconf question for postmaster:
1016 # Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
1017 # to the user account of the actual system administrator.
1018 # If this value is left empty, such mail will be saved in /var/mail/mail, which is not
1020 # Note that postmaster\'s mail should be read on the system to which it is directed,
1021 # rather than being forwarded elsewhere, so (at least one of) the users listed here
1022 # should not redirect their mail off this machine. A 'real-' prefix can be used to
1023 # force local delivery.
1024 # Multiple user names need to be separated by spaces.
1025 # Root and postmaster mail recipient: