iankelling.org Git - distro-setup/blob - mail-setup

   1 #!/bin/bash
   2 # -*- eval: (outline-minor-mode); -*-
   3 # * intro
   4 # Copyright (C) 2019 Ian Kelling
   5 # SPDX-License-Identifier: AGPL-3.0-or-later
   6
   7
   8 set -x
   9
  10 # TODO: copy dkim keys from within this file. its now done in conflink.
  11 # TODO: fix dkim key to b chmod 640, group Debian-exim
  12
  13 set -eE -o pipefail
  14 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  15
  16 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  17 if [[ ! $SUDO_USER ]]; then
  18   echo "$0: error: requires running as nonroot or sudo"
  19   exit 1
  20 fi
  21 u=$SUDO_USER
  22
  23
  24 usage() {
  25   cat <<EOF
  26 Usage: ${0##*/}
  27 Setup exim4 & dovecot & related things
  28
  29 The minimal assumption we have is that /etc/mailpass exists
  30
  31
  32 -h|--help  Print help and exit.
  33 EOF
  34   exit $1
  35 }
  36
  37
  38
  39 ####### instructions for icedove #####
  40 # Incoming mail server: mail.iankelling.org, port 143, username iank, connection security starttls, authentication method normal password
  41 # we could also just use 127.0.0.1 with no ssl, but todo: disable that in dovecot, so mail is secure from local programs.
  42 #
  43 # hamburger -> preferences -> preferences -> advanced tab -> config editor button -> security.ssl.enable_ocsp_must_staple = false
  44 # background: ovecot does not yet have ocsp stapling support
  45 # reference: https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921
  46 #
  47 # for phone, same thing but username alerts, pass in ivy-pass.
  48 #######
  49
  50
  51 # * perstent password instructions
  52 # # exim passwords:
  53 # # for hosts which have all private files I just use the same user
  54 # # for other hosts, each one get\'s their own password.
  55 # # for generating secure pass, and storing for server too:
  56 # # user=USUALLY_SAME_AS_HOSTNAME
  57 # user=li
  58 # f=$(mktemp)
  59 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  60 # s sed -i "/^$user:/d" /p/c/filesystem/etc/exim4/passwd
  61 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
  62 # # todo: port is no longer used in mailpass, remove it.
  63 # echo "mail.iankelling.org 587 $user:$(<$f)" >> /p/c/machine_specific/$user/filesystem/etc/mailpass
  64 # # then run this script, or part of it which uses /etc/mailpass
  65
  66 # # dovecot password, i just need 1 as I\'m the only user
  67 # mkdir /p/c/filesystem/etc/dovecot
  68 # echo "iank:$(doveadm pw -s ssha256)::::::" >>/p/c/filesystem/etc/dovecot/users
  69 # conflink
  70
  71
  72
  73 # # for ad-hoc testing of some random new host sending mail:
  74 # user=li # client host username & hostname
  75 # f=$(mktemp)
  76 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  77 # s sed -i "/^$user:/d" /etc/exim4/passwd
  78 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" | s tee -a /etc/exim4/passwd
  79 # echo "mail.iankelling.org:$user:$(<$f)" | ssh root@$user dd of=/etc/exim4/passwd.client
  80 ####### end perstent password instructions ######
  81
  82
  83 # * persistent dkim/dns instructions
  84 # # Remove 1 level of comments in this section, set the domain var
  85 # # for the domain you are setting up, then run this and copy dns settings
  86 # # into dns.
  87 # domain=iankelling.org
  88 # c /p/c/filesystem/etc/exim4
  89 # # this has several bugs addressed in comments, but it was helpful
  90 # # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
  91
  92 # openssl genrsa -out $domain-private.pem 2048 -outform PEM
  93 # openssl rsa -in $domain-private.pem -out $domain.pem -pubout -outform PEM
  94 # # selector is needed for having multiple keys for one domain.
  95 # # I dun do that, so just use a static one: li
  96 # echo "txt record name: li._domainkey.$domain"
  97 # # Debadmin page does not have v=, fastmail does, and this
  98 # # says it\'s recommended in 3.6.1, default is DKIM1 anyways.
  99 # # https://www.ietf.org/rfc/rfc6376.txt
 100 # # Join and print all but first and last line.
 101 # # last line: swap hold & pattern, remove newlines, print.
 102 # # lines 2+: append to hold space
 103 # echo "txt record contents:"
 104 # echo "v=DKIM1; k=rsa; p=$(sed -n '${x;s/\n//gp};2,$H' $domain.pem)"
 105 # chmod 644 $domain.pem
 106 # chmod 640 $domain-private.pem
 107 # # in conflink, we chown these to group debian
 108 # conflink
 109 # # selector was also put into /etc/exim4/conf.d/main/000_local,
 110 # # via the mail-setup scripts
 111
 112 # # 2017-02 dmarc policies:
 113 # # host -t txt _dmarc.gmail.com
 114 # # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
 115 # # there were articles claiming gmail would be  changing
 116 # # to p=reject, in early 2017, which didn\'t happen. I see no sources on them. It\'s
 117 # # expected to cause problems
 118 # # with a few old mailing lists, copying theirs for now.
 119 #
 120 # echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
 121
 122 # # 2017-02 spf policies:
 123 # # host -t txt lists.fedoraproject.org
 124 # # google ~all, hotmail ~all, yahoo: ?all, fastmail ?all, outlook ~all
 125 # # i include fastmail\'s settings, per their instructions,
 126 # # and follow their policy. In mail in a box, or similar instructions,
 127 # # I\'ve seen recommended to not use a restrictive policy.
 128
 129 # # to check if dns has updated, you do
 130 # host -a mesmtp._domainkey.$domain
 131
 132 # # mx records,
 133 # # setting it to iankelling.org would work the same, but this
 134 # # is more flexible, I could change where mail.iankelling.org pointed.
 135 # cat <<'EOF'
 136 # mx records, 2 records each, for * and empty domain
 137 # pri 10 mail.iankelling.org
 138 # EOF
 139 ####### end  persistent dkim instructions #########
 140
 141
 142 # * functions  constants
 143 e() { printf "%s\n" "$*"; }
 144 pi() { # package install
 145   local f
 146   if dpkg -s -- "$@" &> /dev/null; then
 147     return 0;
 148   fi;
 149   while fuser /var/lib/dpkg/lock &>/dev/null; do sleep 1; done
 150   f=/var/cache/apt/pkgcache.bin;
 151   if [[ ! -r $f ]] || (( $(( $(date +%s) - $(stat -c %Y $f ) )) > 60*60*12 )); then
 152     apt-get update
 153   fi
 154   DEBIAN_FRONTEND=noninteractive apt-get -y install --purge --auto-remove "$@"
 155 }
 156
 157 postmaster=alerts
 158 mxhost=mail.iankelling.org
 159 mxport=587
 160 forward=$u@$mxhost
 161
 162 # old setup. left as comment for example
 163 # mxhost=mail.messagingengine.com
 164 # mxport=587
 165 # forward=ian@iankelling.org
 166
 167 smarthost="$mxhost::$mxport"
 168
 169 ## * Install packages
 170 # light version of exim does not have sasl auth support.
 171 pi exim4-daemon-heavy spamassassin spf-tools-perl openvpn dnsmasq
 172
 173 # trisquel 8 = openvpn, debian stretch = openvpn-client
 174 vpn_ser=openvpn-client
 175 if [[ ! -e /lib/systemd/system/openvpn-client@.service ]]; then
 176   vpn_ser=openvpn
 177 fi
 178
 179 ### * user forward file
 180 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 181   # afaik, these will get ignored because they are routing to my own
 182   # machine, but rm them is safer
 183   rm -f $(eval echo ~$u)/.forward /root/.forward
 184 else
 185   # this can\'t be a symlink and has permission restrictions
 186   # it might work in /etc/aliases, but this seems more proper.
 187   install -m 644 {-o,-g}$u <(e $forward) $(eval echo ~$u)/.forward
 188 fi
 189
 190 # * Mail clean cronjob
 191
 192 cat >/etc/systemd/system/mailclean.timer <<'EOF'
 193 [Unit]
 194 Description=Run mailclean daily
 195
 196 [Timer]
 197 OnCalendar=monthly
 198
 199 [Install]
 200 WantedBy=timers.target
 201 EOF
 202
 203 cat >/etc/systemd/system/mailclean.service <<EOF
 204 [Unit]
 205 Description=Delete and archive old mail files
 206 After=multi-user.target
 207
 208 [Service]
 209 User=$u
 210 Type=oneshot
 211 ExecStart=/a/bin/log-quiet/sysd-mail-once mailclean /a/bin/distro-setup/mailclean
 212 EOF
 213
 214 systemctl daemon-reload
 215
 216
 217 # * spamassassin
 218
 219 if [[ $HOSTNAME != "$MAIL_HOST" ]]; then
 220   systemctl stop spamassassin
 221   systemctl disable spamassassin
 222
 223 else
 224
 225   # per readme.debian
 226   sed -i '/^\s*CRON\s*=/d' /etc/default/spamassassin
 227   e CRON=1 >>/etc/default/spamassassin
 228   # just noticed this in the config file, seems like a good idea.
 229   sed -i '/^\s*NICE\s*=/d' /etc/default/spamassassin
 230   e 'NICE="--nicelevel 15"' >>/etc/default/spamassassin
 231
 232   systemctl enable spamassassin
 233   systemctl start spamassassin
 234   systemctl reload spamassassin
 235
 236   cat >/etc/systemd/system/spamddnsfix.service <<'EOF'
 237 [Unit]
 238 Description=spamd dns bug fix cronjob
 239
 240 [Service]
 241 Type=oneshot
 242 ExecStart=/a/bin/distro-setup/spamd-dns-fix
 243 EOF
 244   # 2017-09, debian closed the bug on this saying upstream had fixed it.
 245   # remove this when i\'m using the newer package, ie, debian 10, or maybe
 246   # ubuntu 18.04.
 247   cat >/etc/systemd/system/spamddnsfix.timer <<'EOF'
 248 [Unit]
 249 Description=run spamd bug fix script every 10 minutes
 250
 251 [Timer]
 252 OnActiveSec=60
 253 # the script looks back 9 minutes into the journal,
 254 # it takes a second to run,
 255 # so lets run every 9 minutes and 10 seconds.
 256 OnUnitActiveSec=550
 257
 258 [Install]
 259 WantedBy=timers.target
 260 EOF
 261   systemctl daemon-reload
 262   systemctl restart spamddnsfix.timer
 263   systemctl enable spamddnsfix.timer
 264
 265 fi # [[ $HOSTNAME != "$MAIL_HOST" ]]
 266 #####   end spamassassin config
 267
 268
 269 # * Update mail cert
 270 if [[ -e /p/c/filesystem ]]; then
 271   # allow failure of these commands when our internet is down, they are likely not needed,
 272   # we check that a valid cert is there already.
 273   # to put the hostname in the known hosts
 274   if ! ssh -o StrictHostKeyChecking=no root@li.iankelling.org :; then
 275     # This just causes failure if our cert is going to expire in the next 30 days.
 276     # Certs I generate last 10 years.
 277     openssl x509 -checkend $(( 60 * 60 * 24 * 30 )) -noout -in /etc/openvpn/mail.crt
 278   else
 279     # note, man openvpn implies we could just call mail-route on vpn startup/shutdown with
 280     # systemd, buuut it can remake the tun device unexpectedly, i got this in the log
 281     # after my internet was down for a bit:
 282     # NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.
 283     /a/exe/vpn-mk-client-cert -b mail -n mail -s /b/ds/mail-route li.iankelling.org
 284   fi
 285 fi
 286
 287
 288
 289 f=/usr/local/bin/mail-cert-cron
 290 cat >$f <<'EOF'
 291 #!/bin/bash
 292 set -eE -o pipefail
 293 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 294
 295 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
 296
 297 f=/a/bin/bash_unpublished/source-state
 298 if [[ -e $f ]]; then
 299     source $f
 300 fi
 301 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 302     local_mx=mail.iankelling.org
 303     rsync_common="rsync -ogtL --chown=root:Debian-exim --chmod=640 root@li.iankelling.org:/etc/letsencrypt/live/$local_mx/"
 304     ${rsync_common}fullchain.pem /etc/exim4/exim.crt
 305     ret=$?
 306     ${rsync_common}privkey.pem /etc/exim4/exim.key
 307     new_ret=$?
 308     if [[ $ret != $new_ret ]]; then
 309        echo "$0: error: differing rsync returns, $ret, $new_ret"
 310        exit 1
 311     fi
 312 fi
 313 if [[ $new_ret != 0 ]]; then
 314     if ! openssl x509 -checkend $(( 60 * 60 * 24 * 3 )) -noout -in /etc/exim4/exim.crt; then
 315         echo "$0: error!: cert rsync failed and it will expire in less than 3 days"
 316         exit 1
 317     fi
 318 fi
 319 exit 0
 320 EOF
 321 chmod 755 $f
 322
 323 cat >/etc/systemd/system/mailcert.service <<'EOF'
 324 [Unit]
 325 Description=Mail cert rsync
 326 After=multi-user.target
 327
 328 [Service]
 329 Type=oneshot
 330 ExecStart=/a/bin/log-quiet/sysd-mail-once mailcert /usr/local/bin/mail-cert-cron
 331 EOF
 332
 333 cat >/etc/systemd/system/mailcert.timer <<'EOF'
 334 [Unit]
 335 Description=Run mail-cert once a day
 336
 337 [Timer]
 338 OnCalendar=daily
 339
 340 [Install]
 341 WantedBy=timers.target
 342 EOF
 343 systemctl daemon-reload
 344 systemctl start mailcert
 345 systemctl restart mailcert.timer
 346 systemctl enable mailcert.timer
 347
 348
 349
 350 # * common exim4 config
 351 source /a/bin/bash_unpublished/source-state
 352
 353
 354 ### make local bounces go to normal maildir
 355 # local mail that bounces goes to /Maildir or /root/Maildir
 356 dirs=(/m/md/bounces/{cur,tmp,new})
 357 mkdir -p ${dirs[@]}
 358 chown -R $u:Debian-exim /m/md/bounces
 359 chmod 775 ${dirs[@]}
 360 usermod -a -G Debian-exim $u
 361 for d in /Maildir /root/Maildir; do
 362   if [[ ! -L $d ]]; then
 363     rm -rf $d
 364   fi
 365   ln -sf -T /m/md/bounces $d
 366 done
 367
 368
 369 ### begin setup passwd.client
 370 f=/etc/exim4/passwd.client
 371 rm -f /etc/exim4/passwd.client
 372 install -m 640 -g Debian-exim /dev/null $f
 373 while read -r domain _ pass; do
 374   # reference: exim4_passwd_client(5)
 375   printf "%s:%s\n" "$domain" "$pass" >>$f
 376 done </etc/mailpass
 377 ###  end setup passwd.client
 378
 379 # by default, only 10 days of logs are kept. increase that.
 380 sed -ri 's/^(\s*rotate\s).*/\11000/' /etc/logrotate.d/exim4-base
 381
 382
 383 ## https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
 384 # i only need .forwards, so just doing that one.
 385 cd /etc/exim4/conf.d/router
 386 b=userforward_higher_priority
 387 # replace the router name so it is unique
 388 sed -r s/^\\S+:/$b:/ 600_exim4-config_userforward >175_$b
 389
 390
 391 rm -f /etc/exim4/conf.d/main/000_localmacros # old filename
 392 cat >/etc/exim4/conf.d/main/000_local <<EOF
 393 MAIN_TLS_ENABLE = true
 394
 395
 396 # debian exim config added this in 2016 or so?
 397 # it's part of the smtp spec, to limit lines to 998 chars
 398 # but a fair amount of legit mail does not adhere to it. I don't think
 399 # this should be default, like it says in
 400 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828801
 401 # todo: the bug for introducing this was about headers, but
 402 # the fix maybe is for all lines? one says gmail rejects, the
 403 # other says gmail does not reject. figure out and open a new bug.
 404 IGNORE_SMTP_LINE_LENGTH_LIMIT = true
 405
 406 # more verbose logs
 407 MAIN_LOG_SELECTOR = +all
 408
 409 EOF
 410
 411 rm -f /etc/exim4/rcpt_local_acl # old path
 412 cat >/etc/exim4/conf.d/rcpt_local_acl <<'EOF'
 413 # Only hosts we control send to @mail.iankelling.org, so make sure
 414 # they are all authed.
 415 # Note, if we wanted authed senders for all domains,
 416 # we could make this condition in acl_check_mail
 417 deny
 418   message = ian trusted domain recepient but no auth
 419   !authenticated = *
 420   domains = mail.iankelling.org
 421 EOF
 422 rm -f /etc/exim4/data_local_acl # old path
 423 cat >/etc/exim4/conf.d/data_local_acl <<'EOF'
 424 # Except for the "condition =", this was
 425 # a comment in the check_data acl. The comment about this not
 426 # being suitable is mostly bs. The only thing related I found was to
 427 # add the condition =, cuz spamassassin has problems with big
 428 # messages and spammers don't bother with big messages,
 429 # but I've increased the size from 10k
 430 # suggested in official docs, and 100k in the wiki example because
 431 # those docs are rather old and I see a 110k spam message
 432 # pretty quickly looking through my spam folder.
 433 warn
 434   condition = ${if < {$message_size}{2000K}}
 435   spam = Debian-exim:true
 436   add_header = X-Spam_score: $spam_score\n\
 437             X-Spam_score_int: $spam_score_int\n\
 438             X-Spam_bar: $spam_bar\n\
 439             X-Spam_report: $spam_report
 440
 441 #accept
 442 #  spf = pass:fail:softfail:none:neutral:permerror:temperror
 443 #  dmarc_status = reject:quarantine
 444 #  add_header = Reply-to: dmarctest@iankelling.org
 445
 446 EOF
 447 cat >/etc/exim4/conf.d/auth/29_exim4-config_auth <<'EOF'
 448 # from 30_exim4-config_examples
 449
 450 plain_server:
 451 driver = plaintext
 452 public_name = PLAIN
 453 server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
 454 server_set_id = $auth2
 455 server_prompts = :
 456 .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
 457 server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
 458 .endif
 459 EOF
 460
 461 cat >/etc/exim4/conf.d/router/900_exim4-config_local_user <<'EOF'
 462 ### router/900_exim4-config_local_user
 463 #################################
 464
 465 # This router matches local user mailboxes. If the router fails, the error
 466 # message is "Unknown user".
 467
 468 local_user:
 469   debug_print = "R: local_user for $local_part@$domain"
 470   driver = accept
 471   domains = +local_domains
 472 # ian: commented this, in conjunction with a dovecot lmtp
 473 # change so I get mail for all users.
 474 #  check_local_user
 475   local_parts = ! root
 476   transport = LOCAL_DELIVERY
 477   cannot_route_message = Unknown user
 478 EOF
 479 cat >/etc/exim4/conf.d/transport/30_exim4-config_dovecot_lmtp <<'EOF'
 480 dovecot_lmtp:
 481         driver = lmtp
 482         socket = /var/run/dovecot/lmtp
 483         #maximum number of deliveries per batch, default 1
 484         batch_max = 200
 485 EOF
 486
 487 cat >/etc/exim4/host_local_deny_exceptions <<'EOF'
 488 mail.fsf.org
 489 *.posteo.de
 490 EOF
 491
 492 cat >/etc/exim4/conf.d/router/190_exim4-config_fsfsmarthost <<'EOF'
 493 # smarthost for fsf mail
 494 # ian: copied from /etc/exim4/conf.d/router/200_exim4-config_primary, and added senders = and
 495 # replaced DCsmarthost with mail.fsf.org
 496 fsfsmarthost:
 497   debug_print = "R: smarthost for $local_part@$domain"
 498   driver = manualroute
 499   domains = ! +local_domains
 500   senders = *@fsf.org
 501   transport = remote_smtp_smarthost
 502   route_list = * mail.fsf.org byname
 503   host_find_failed = ignore
 504   same_domain_copy_routing = yes
 505   no_more
 506 EOF
 507
 508
 509 cat >/etc/exim4/update-exim4.conf.conf  <<'EOF'
 510 # default stuff, i havent checked if its needed
 511 dc_minimaldns='false'
 512 dc_relay_nets=''
 513 CFILEMODE='644'
 514 dc_use_split_config='true'
 515 dc_local_interfaces=''
 516 dc_mailname_in_oh='true'
 517 EOF
 518
 519 # * if MAIL_HOST
 520 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 521   # ** dovecot
 522   ####### begin dovecot setup ########
 523   # based on a little google and package search, just the dovecot
 524   # packages we need instead of dovecot-common.
 525   #
 526   # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
 527   # directly.  The reason to do this is to use dovecot\'s sieve, which
 528   # has extensions that allow it to be almost equivalent to exim\'s
 529   # filter capabilities, some ways probably better, some worse, and
 530   # sieve has the benefit of being supported in postfix and
 531   # proprietary/weird environments, so there is more examples on the
 532   # internet. I was torn about whether to do this or not, meh.
 533   pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
 534
 535   for f in /p/c/subdir_files/sieve/*sieve /a/c/subdir_files/sieve/*sieve; do
 536     sudo -u $u /a/exe/lnf -T $f $(eval echo ~$u)/sieve/${f##*/}
 537   done
 538   # if we changed 90-sieve.conf and removed the active part of the
 539   # sieve option, we wouldn\'t need this, but I\'d rather not modify a
 540   # default config if not needed. This won\'t work as a symlink in /a/c
 541   # unfortunately.
 542   sudo -u $u /a/exe/lnf -T sieve/main.sieve $(eval echo ~$u)/.dovecot.sieve
 543
 544   # we set this later in local.conf
 545   sed -ri -f - /etc/dovecot/conf.d/10-mail.conf <<'EOF'
 546 /^\s*mail_location\s*=/d
 547 EOF
 548
 549   cat >/etc/dovecot/conf.d/20-lmtp.conf <<EOF
 550 protocol lmtp {
 551 #per https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
 552   mail_plugins = \$mail_plugins sieve
 553 # default was
 554   #mail_plugins = \$mail_plugins
 555
 556 # For a normal setup with exim, we need something like this, which
 557 # removes the domain part
 558 #  auth_username_format = %Ln
 559 #
 560 #  or else # Exim says something like
 561 #  "LMTP error after RCPT ... 550 ... User doesn't exist someuser@somedomain"
 562 # Dovecot verbose log says something like
 563 # "auth-worker(9048): passwd(someuser@somedomain): unknown user"
 564 # reference: http://wiki.dovecot.org/LMTP/Exim
 565 #
 566 # However, I use this to direct all mail to the same inbox.
 567 # A normal way to do this, which I did at first is to have
 568 # a router in exim almost at the end, eg 950,
 569 #local_catchall:
 570 #  debug_print = "R: catchall for \$local_part@\$domain"
 571 #  driver = redirect
 572 #  domains = +local_domains
 573 #  data = $u
 574 # based on
 575 # http://blog.alteholz.eu/2015/04/exim4-and-catchall-email-address/
 576 # with superflous options removed.
 577 # However, this causes the envelope to be rewritten,
 578 # which makes filtering into mailboxes a little less robust or more complicated,
 579 # so I've done it this way instead. it also requires
 580 # modifying the local router in exim.
 581   auth_username_format = $u
 582 }
 583
 584 EOF
 585
 586
 587   cat >/etc/dovecot/local.conf <<EOF
 588 # so I can use a different login that my shell login for mail.  this is
 589 # worth doing solely for the reason that if this login is compromised,
 590 # it won't also compromise my shell password.
 591 !include conf.d/auth-passwdfile.conf.ext
 592
 593 # settings derived from wiki and 10-ssl.conf
 594 ssl = required
 595 ssl_cert = </etc/exim4/exim.crt
 596 ssl_key = </etc/exim4/exim.key
 597 # https://github.com/certbot/certbot/raw/master/certbot-apache/certbot_apache/options-ssl-apache.conf
 598 # in my cert cronjob, I check if that has changed upstream.
 599 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
 600
 601 # ian: added this, more secure, per google etc
 602 ssl_prefer_server_ciphers = yes
 603
 604
 605 mail_location = maildir:/m/%u:LAYOUT=fs:INBOX=/m/%u/INBOX
 606 mail_uid = $u
 607 mail_gid = $u
 608
 609 # for debugging info, uncomment these.
 610 # logs go to syslog and to /var/log/mail.log
 611 # auth_verbose=yes
 612 #mail_debug=yes
 613 EOF
 614   ####### end dovecot setup ########
 615
 616   # ** exim
 617
 618   # mail.iankelling.org so local imap clients can connect with tls and
 619   # when they happen to not be local.
 620   sed -ri -f - /etc/hosts <<'EOF'
 621 /^127\.0\.1\.1.* mail\.iankelling\.org\b/{p;d}
 622 /^127\.0\.1\.1 /s/ *$/ mail.iankelling.org/
 623 EOF
 624   /a/exe/cedit mail /etc/dnsmasq-servers.conf <<'EOF' || [[ $? == 1 ]]
 625 server=/mail.iankelling.org/127.0.1.1
 626 EOF
 627   systemctl reload dnsmasq
 628
 629   # I used to use debconf-set-selections + dpkg-reconfigure,
 630   # which then updates this file
 631   # but the process is slower than updating it directly and then I want to set other things in
 632   # update-exim4.conf.conf, so there's no point.
 633   # The file is documented in man update-exim4.conf,
 634   # except the man page is not perfect, read the bash script to be sure about things.
 635
 636   # The debconf questions output is additional documentation that is not
 637   # easily accessible, but super long, along with the initial default comment in this
 638   # file, so I've saved that into ./mail-notes.conf.
 639
 640   cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 641 # note: some things we don't set that are here by default because they are unused.
 642
 643 dc_eximconfig_configtype='internet'
 644
 645 # man page: is used to build the local_domains list, together with “localhost”
 646 # iank.bid is for testing
 647 # mail.iankelling.org is for machines i own
 648 dc_other_hostnames='*.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org;*.b8.nz;b8.nz'
 649
 650 # from man page:
 651 # Is  a  list  of  domains for which we accept mail from anywhere on the Internet but which are not delivered locally, e.g.
 652 # because this machine serves as secondary MX for these domains. Sets MAIN_RELAY_TO_DOMAINS.
 653 # todo: we should not accept from anywhere, only the mx for fsf.
 654 dc_relay_domains='*.fsf.org;fsf.org'
 655 EOF
 656
 657
 658   # the debconf output about mailname is as follows:
 659   # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
 660   # name.
 661   # This name will also be used by other programs. It should be the single, fully
 662   # qualified domain name (FQDN).
 663   # Thus, if a mail address on the local host is foo@example.org, the correct value for
 664   # this option would be example.org.
 665   # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
 666
 667   echo mail.iankelling.org > /etc/mailname
 668
 669   # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
 670   # smarthost config type, not sure. all other settings
 671   # would be unused in that config type.
 672   cat >>/etc/exim4/conf.d/main/000_local <<EOF
 673 # enable 587 in addition to the default 25, so that
 674 # i can send mail where port 25 is firewalled by isp
 675 daemon_smtp_ports = 25 : 587
 676 # i don't have ipv6 setup properly yet
 677 disable_ipv6 = true
 678
 679 DKIM_CANON = relaxed
 680 DKIM_SELECTOR = li
 681
 682 # from comments in
 683 # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
 684
 685 # The file is based on the outgoing domain-name in the from-header.
 686 DKIM_DOMAIN = \${lc:\${domain:\$h_from:}}
 687 # sign if key exists
 688 DKIM_PRIVATE_KEY= \${if exists{/etc/exim4/\${dkim_domain}-private.pem} {/etc/exim4/\${dkim_domain}-private.pem}}
 689
 690
 691 # failing message on mail-tester.com:
 692 # We check if there is a server (A Record) behind your hostname kd.
 693 # You may want to publish a DNS record (A type) for the hostname kd or use a different hostname in your mail software
 694 # https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
 695 # and this one seemed appropriate from grepping config.
 696 # I originally set this to li.iankelling.org, but then ended up with errors when li tried to send
 697 # mail to kd, so this should basically be a name that no host has as their
 698 # canonical hostname since the actual host sits behind a nat and changes.
 699 # Seems logical for this to be the same as mailname.
 700 MAIN_HARDCODE_PRIMARY_HOSTNAME = mail.iankelling.org
 701
 702 # normally empty, I set this so I can set the envelope address
 703 # when doing mail redelivery to invoke filters
 704 MAIN_TRUSTED_GROUPS = $u
 705
 706 LOCAL_DELIVERY = dovecot_lmtp
 707
 708 # options exim has to avoid having to alter the default config files
 709 CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/conf.d/rcpt_local_acl
 710 CHECK_DATA_LOCAL_ACL_FILE = /etc/exim4/conf.d/data_local_acl
 711
 712 # most of the ones that gmail seems to use.
 713 # Exim has horrible default of signing unincluded
 714 # list- headers since they got mentioned in an
 715 # rfc, but this messes up mailing lists, like gnu/debian which want to
 716 # keep your dkim signature intact but add list- headers.
 717 DKIM_SIGN_HEADERS = mime-version:in-reply-to:references:from:date:subject:to
 718
 719 # recommended if dns is expected to work
 720 CHECK_RCPT_VERIFY_SENDER = true
 721 # seems like a good idea
 722 CHECK_DATA_VERIFY_HEADER_SENDER = true
 723 CHECK_RCPT_SPF = true
 724 CHECK_RCPT_REVERSE_DNS = true
 725 CHECK_MAIL_HELO_ISSUED = true
 726
 727 # testing dmarc
 728 #dmarc_tld_file = /etc/public_suffix_list.dat
 729 EOF
 730
 731   f=/etc/cron.daily/refresh-dmarc-tld-file
 732   cat >$f <<'EOF'
 733 #!/bin/bash
 734 cd /etc
 735 wget -q -N https://publicsuffix.org/list/public_suffix_list.dat
 736 EOF
 737   chmod 755 $f
 738
 739   sed -i --follow-symlinks -f - /etc/aliases <<EOF
 740 \$a root: $postmaster
 741 /^root:/d
 742 EOF
 743
 744
 745   # https://selivan.github.io/2017/12/30/systemd-serice-always-restart.html
 746   d=/etc/systemd/system/openvpn@mail.service.d
 747   mkdir -p $d
 748   cat >$d/override.conf <<'EOF'
 749 [Service]
 750 Restart=always
 751 # time to sleep before restarting a service
 752 RestartSec=1
 753
 754 [Unit]
 755 # StartLimitIntervalSec in recent systemd versions
 756 StartLimitInterval=0
 757 EOF
 758   if ! systemctl cat openvpn@mail.service|grep -xF StartLimitInterval=0 &>/dev/null; then
 759     # needed for the above config to go into effect
 760     systemctl daemon-reexec
 761   fi
 762
 763
 764   systemctl enable mailclean.timer
 765   systemctl start mailclean.timer
 766   systemctl restart $vpn_ser@mail
 767   systemctl enable $vpn_ser@mail
 768   systemctl enable dovecot
 769   systemctl restart dovecot
 770
 771   # * not MAIL_HOST
 772 else # $HOSTNAME != $MAIL_HOST
 773   # remove mail. 2 lines to properly remove whitespace
 774   sed -ri -f - /etc/hosts <<'EOF'
 775 s#^(127\.0\.1\.1 .*) +mail\.iankelling\.org$#\1#
 776 s#^(127\.0\.1\.1 .*)mail\.iankelling\.org +(.*)#\1\2#
 777 EOF
 778
 779   echo | /a/exe/cedit mail /etc/dnsmasq-servers.conf || [[ $? == 1 ]]
 780   if systemctl is-active dnsmasq >/dev/null; then
 781     systemctl reload dnsmasq
 782   fi
 783
 784   systemctl disable mailclean.timer &>/dev/null ||:
 785   systemctl stop mailclean.timer &>/dev/null ||:
 786   systemctl disable $vpn_ser@mail
 787   systemctl stop $vpn_ser@mail
 788   systemctl disable dovecot ||:
 789   systemctl stop dovecot ||:
 790   #
 791   #
 792   # would only exist because I wrote it i the previous condition,
 793   # it\'s not part of exim
 794   rm -f /etc/exim4/conf.d/main/000_localmacros
 795   cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 796 dc_eximconfig_configtype='smarthost'
 797 dc_smarthost='$smarthost'
 798 # The manpage incorrectly states this will do header rewriting, but
 799 # that only happens if we have dc_hide_mailname is set.
 800 dc_readhost='iankelling.org'
 801 # Only used in case of bounces.
 802 dc_localdelivery='maildir_home'
 803 EOF
 804
 805   hostname -f > /etc/mailname
 806
 807   # This ends up at alerts mailbox on MAIL_HOST, but using a user that doesn't exist elsewhere
 808   # is no good.
 809   sed -i --follow-symlinks -f - /etc/aliases <<EOF
 810 \$a root: root@mail.iankelling.org
 811 /^root:/d
 812 EOF
 813
 814 fi # end $HOSTNAME != $MAIL_HOST
 815
 816 # * spool dir setup
 817
 818 # ** bind mount setup
 819 # put spool dir in directory that spans multiple distros.
 820 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
 821 #
 822 # todo: I\'m suspicious of uids for Debian-exim being the same across
 823 # distros. It would be good to test this.
 824 dir=/nocow/exim4
 825 sdir=/var/spool/exim4
 826 # we only do this if our system has $dir
 827
 828 # this used to do a symlink, but, in the boot logs, /nocow would get mounted succesfully,
 829 # about 2 seconds later, exim starts, and immediately puts into paniclog:
 830 # honVi-0000u3-82 Failed to create directory "/var/spool/exim4/input": No such file or directory
 831 # so, im trying a bind mount to get rid of that.
 832 if [[ -e /nocow ]]; then
 833   if ! grep -Fx "/nocow/exim4  /var/spool/exim4  none  bind  0 0" /etc/fstab; then
 834     echo "/nocow/exim4  /var/spool/exim4  none  bind  0 0" >> /etc/fstab
 835   fi
 836   if ! mountpoint -q $sdir; then
 837     systemctl stop exim4
 838     if [[ -L $sdir ]]; then
 839       rm $sdir
 840     fi
 841     if [[ ! -e $dir && -d $sdir ]]; then
 842       mv $sdir $dir
 843     fi
 844     if [[ ! -d $sdir ]]; then
 845       mkdir $sdir
 846       chmod 000 $sdir # only want it to be used when its mounted
 847     fi
 848     mount $sdir
 849   fi
 850 fi
 851
 852
 853
 854 # ** exim/spool uid setup
 855 # i have the spool directory be common to distro multi-boot, so
 856 # we need the uid to be the same. 608 cuz it's kind of in the middle
 857 # of the free system uids.
 858 IFS=:; read _ _ uid _ < <(getent passwd Debian-exim ||:) ||:; unset IFS
 859 IFS=:; read _ _ gid _ < <(getent group Debian-exim ||:) ||:; unset IFS
 860 if [[ ! $uid ]]; then
 861   # from /var/lib/dpkg/info/exim4-base.postinst, plus uid and gid options
 862   adduser --uid 608 --system --group --quiet --home /var/spool/exim4 \
 863           --no-create-home --disabled-login --force-badname Debian-exim
 864 elif [[ $uid != 608 ]]; then
 865   systemctl stop exim4 ||:
 866   usermod -u 608 Debian-exim
 867   groupmod -g 608 Debian-exim
 868   usermod -g 608 Debian-exim
 869   find / /nocow -xdev -uid $uid -exec chown -h 608 {} +
 870   find / /nocow -xdev -gid $gid -exec chgrp -h 608 {} +
 871 fi
 872
 873
 874
 875
 876 # * reload exim
 877
 878 systemctl reload exim4
 879 systemctl start exim4
 880
 881
 882 # * mail monitoring / testing
 883 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 884   f=/usr/local/bin/send-test-forward
 885   cat >$f <<'EOFOUTER'
 886 #!/bin/bash
 887 /usr/sbin/exim -t <<EOF
 888 From: ian@iankelling.org
 889 To: iank@posteo.de
 890 Subject: primary_test $(date +%s) $(date +%Y-%m-%dT%H:%M:%S%z)
 891
 892 eom
 893 EOF
 894 EOFOUTER
 895   chmod +x $f
 896
 897   cat >/etc/cron.d/mailtest <<EOF
 898 SHELL=/bin/bash
 899 # running as user just because no need to run as root
 900 */10 * * * *   $u $f 2>&1 | /usr/local/bin/log-once send-test-forward
 901 */10 * * * *   $u /usr/local/bin/mailtest-check 2>&1 | /usr/local/bin/log-once -1 mailtest-check
 902 */10 * * * *   root chmod -R g+rw /m/md/bounces 2>&1 | /usr/local/bin/log-once -1 bounces-chmod
 903 EOF
 904   cp /a/bin/distro-setup/filesystem/usr/local/bin/mailtest-check /usr/local/bin
 905 else
 906   rm -f /etc/cron.d/mailtest
 907 fi
 908
 909
 910 # * Radicale
 911
 912 # MAIL_HOST also does radicale, and easier to start and stop it here
 913 # for when MAIL_HOST changes, so radicale gets the synced files and
 914 # does not stop us from remounting /o.
 915 if dpkg -s radicale &>/dev/null; then
 916   if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 917     systemctl restart radicale
 918     systemctl enable radicale
 919     if [[ -e /etc/logrotate.d/radicale.disabled ]]; then
 920       mv /etc/logrotate.d/radicale{.disabled,}
 921     fi
 922   else
 923     systemctl stop radicale
 924     systemctl disable radicale
 925     # weekly logrotate tries to restart radicale even if it's a disabled service in flidas.
 926     if [[ -e /etc/logrotate.d/radicale ]]; then
 927       mv /etc/logrotate.d/radicale{,.disabled}
 928     fi
 929   fi
 930 fi
 931
 932 # * misc
 933 sudo -u $u ln -sf -T /m/.mu /home/$u/.mu
 934
 935
 936 # /etc/alias setup is debian specific, and exim postinst script sets up
 937 # an /etc/alias from root to the postmaster, based on the question
 938 # exim4-config exim4/dc_postmaster, as long as there exists an entry for
 939 # root, or there was no preexisting aliases file. postfix won\'t set up
 940 # a root to $postmaster alias if it\'s already installed. Easiest to
 941 # just set it ourselves.
 942
 943 # debconf question for postmaster:
 944 # Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
 945 # to the user account of the actual system administrator.
 946 # If this value is left empty, such mail will be saved in /var/mail/mail, which is not
 947 # recommended.
 948 # Note that postmaster\'s mail should be read on the system to which it is directed,
 949 # rather than being forwarded elsewhere, so (at least one of) the users listed here
 950 # should not redirect their mail off this machine. A 'real-' prefix can be used to
 951 # force local delivery.
 952 # Multiple user names need to be separated by spaces.
 953 # Root and postmaster mail recipient:
 954
 955
 956 exit 0
 957 :