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 if [ -z "$BASH_VERSION" ]; then echo "error: shell is not bash" >&2; exit 1; fi
   8
   9 pre="${0##*/}:"
  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; }
  13
  14 shopt -s nullglob
  15
  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
  20 else
  21   err "no err tracing script found"
  22   exit 1
  23 fi
  24
  25 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  26 if [[ ! $SUDO_USER ]]; then
  27   echo "$0: error: requires running as nonroot or sudo"
  28   exit 1
  29 fi
  30 u=$SUDO_USER
  31
  32
  33 usage() {
  34   cat <<EOF
  35 Usage: ${0##*/}
  36 Setup exim4 & dovecot & related things
  37
  38 -h|--help  Print help and exit.
  39 EOF
  40   exit $1
  41 }
  42
  43
  44
  45 ####### instructions for icedove #####
  46 # Incoming mail server: mail.iankelling.org, port 143, username iank, connection security starttls, authentication method normal password
  47 # we could also just use 127.0.0.1 with no ssl, but todo: disable that in dovecot, so mail is secure from local programs.
  48 #
  49 # hamburger -> preferences -> preferences -> advanced tab -> config editor button -> security.ssl.enable_ocsp_must_staple = false
  50 # background: ovecot does not yet have ocsp stapling support
  51 # reference: https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921
  52 #
  53 # for phone, k9mail, same thing but username alerts, pass in ivy-pass.
  54 # also, l2.b8.nz for secondary alerts
  55 # fetching mail settings: folder poll frequency 10 minutes
  56 #######
  57
  58
  59 # * perstent password instructions
  60 # # exim passwords:
  61 # # for hosts which have all private files I just use the same user
  62 # # for other hosts, each one get\'s their own password.
  63 # # for generating secure pass, and storing for server too:
  64 # f=$(mktemp)
  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
  72
  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
  76
  77 ####### end perstent password instructions ######
  78
  79
  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
  83 # # into dns.
  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
  88
  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' $domain.pem)"
 102 # # selector was also put into /etc/exim4/conf.d/main/000_local,
 103
 104 # # 2017-02 dmarc policies:
 105 # # host -t txt _dmarc.gmail.com
 106 # # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
 107 # # there were articles claiming gmail would be  changing
 108 # # to p=reject, in early 2017, which didn\'t happen. I see no sources on them. It\'s
 109 # # expected to cause problems
 110 # # with a few old mailing lists, copying theirs for now.
 111 #
 112 # echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
 113
 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.
 120
 121 # # to check if dns has updated, you do
 122 # host -a mesmtp._domainkey.$domain
 123
 124 # # mx records,
 125 # # setting it to iankelling.org would work the same, but this
 126 # # is more flexible, I could change where mail.iankelling.org pointed.
 127 # cat <<'EOF'
 128 # mx records, 2 records each, for * and empty domain
 129 # pri 10 mail.iankelling.org
 130 # EOF
 131 ####### end  persistent dkim instructions #########
 132
 133
 134 # * functions  constants
 135 e() { printf "%s\n" "$*"; }
 136 pi() { # package install without starting daemons
 137   local f
 138   if dpkg -s -- "$@" &> /dev/null; then
 139     return 0;
 140   fi;
 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 $f ) )) > 60*60*12 )); then
 144     m apt-get update
 145   fi
 146   f=/usr/sbin/policy-rc.d
 147   dd of=$f 2>/dev/null <<EOF
 148 #!/bin/sh
 149 exit 101
 150 EOF
 151   chmod +x $f
 152   ret=
 153   DEBIAN_FRONTEND=noninteractive m apt-get -y install --purge --auto-remove "$@" || ret=$?
 154   rm $f
 155   if [[ $ret ]]; then
 156     err-exit $ret "failed apt-get install above"
 157   fi
 158 }
 159
 160 postmaster=alerts
 161 mxhost=mail.iankelling.org
 162 mxport=587
 163 forward=$u@$mxhost
 164
 165 # old setup. left as comment for example
 166 # mxhost=mail.messagingengine.com
 167 # mxport=587
 168 # forward=ian@iankelling.org
 169
 170 smarthost="$mxhost::$mxport"
 171
 172 ## * Install packages
 173 # light version of exim does not have sasl auth support.
 174 pi exim4-daemon-heavy spamassassin spf-tools-perl dnsmasq openvpn
 175 # our nostart pi fails to avoid enabling
 176 sudo systemctl disable openvpn
 177
 178 # trisquel 8 = openvpn, debian stretch = openvpn-client
 179 vpn_ser=openvpn-client
 180 if [[ ! -e /lib/systemd/system/openvpn-client@.service ]]; then
 181   vpn_ser=openvpn
 182 fi
 183
 184 uhome=$(eval echo ~$u)
 185 ### * user forward file
 186
 187 case $HOSTNAME in
 188   $MAIL_HOST|l2)
 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
 192     ;;
 193   *)
 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) $uhome/.forward
 198     ;;
 199 esac
 200
 201 # * Mail clean cronjob
 202
 203 cat >/etc/systemd/system/mailclean.timer <<'EOF'
 204 [Unit]
 205 Description=Run mailclean daily
 206
 207 [Timer]
 208 OnCalendar=monthly
 209
 210 [Install]
 211 WantedBy=timers.target
 212 EOF
 213
 214 cat >/etc/systemd/system/mailclean.service <<EOF
 215 [Unit]
 216 Description=Delete and archive old mail files
 217 After=multi-user.target
 218
 219 [Service]
 220 User=$u
 221 Type=oneshot
 222 ExecStart=/a/bin/log-quiet/sysd-mail-once mailclean /a/bin/distro-setup/mailclean
 223 EOF
 224
 225 systemctl daemon-reload
 226
 227
 228 # * spamassassin
 229
 230 if [[ $HOSTNAME != "$MAIL_HOST" ]]; then
 231   m systemctl stop spamassassin
 232   m systemctl disable spamassassin
 233 else
 234
 235   # per readme.debian
 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
 241
 242   m systemctl enable spamassassin
 243   m systemctl start spamassassin
 244   m systemctl reload spamassassin
 245
 246   cat >/etc/systemd/system/spamddnsfix.service <<'EOF'
 247 [Unit]
 248 Description=spamd dns bug fix cronjob
 249
 250 [Service]
 251 Type=oneshot
 252 ExecStart=/a/bin/distro-setup/spamd-dns-fix
 253 EOF
 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
 256   # ubuntu 18.04.
 257   cat >/etc/systemd/system/spamddnsfix.timer <<'EOF'
 258 [Unit]
 259 Description=run spamd bug fix script every 10 minutes
 260
 261 [Timer]
 262 OnActiveSec=60
 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.
 266 OnUnitActiveSec=550
 267
 268 [Install]
 269 WantedBy=timers.target
 270 EOF
 271   m systemctl daemon-reload
 272   m systemctl restart spamddnsfix.timer
 273   m systemctl enable spamddnsfix.timer
 274
 275 fi # [[ $HOSTNAME != "$MAIL_HOST" ]]
 276 #####   end spamassassin config
 277
 278
 279 # * Update mail cert
 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 $(( 60 * 60 * 24 * 30 )) -noout -in /etc/openvpn/mail.crt
 288   else
 289     # note, man openvpn implies we could just call mail-route on vpn startup/shutdown with
 290     # systemd, buuut it can remake the tun device unexpectedly, i got this in the log
 291     # after my internet was down for a bit:
 292     # NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.
 293     m /a/exe/vpn-mk-client-cert -b mail -n mail -s /b/ds/mail-route li.iankelling.org
 294   fi
 295 fi
 296
 297
 298
 299 f=/usr/local/bin/mail-cert-cron
 300 cat >$f <<'EOF'
 301 #!/bin/bash
 302 set -eE -o pipefail
 303 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 304
 305 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
 306
 307 f=/a/bin/bash_unpublished/source-state
 308 if [[ -e $f ]]; then
 309     source $f
 310 fi
 311 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 312     local_mx=mail.iankelling.org
 313     mkdir -p /etc/letsencrypt/live/$local_mx
 314     chmod 700 /etc/letsencrypt/live
 315     rsync_common="rsync -ogtL --chown=root:Debian-exim --chmod=640 root@li.iankelling.org:/etc/letsencrypt/live/$local_mx/"
 316     ${rsync_common}fullchain.pem /etc/exim4/exim.crt
 317     ret=$?
 318     ${rsync_common}privkey.pem /etc/exim4/exim.key
 319     new_ret=$?
 320     if [[ $ret != $new_ret ]]; then
 321        echo "$0: error: differing rsync returns, $ret, $new_ret"
 322        exit 1
 323     fi
 324 fi
 325 if [[ $new_ret != 0 ]]; then
 326     if ! openssl x509 -checkend $(( 60 * 60 * 24 * 3 )) -noout -in /etc/exim4/exim.crt; then
 327         echo "$0: error!: cert rsync failed and it will expire in less than 3 days"
 328         exit 1
 329     fi
 330 fi
 331 exit 0
 332 EOF
 333 m chmod 755 $f
 334
 335 cat >/etc/systemd/system/mailcert.service <<'EOF'
 336 [Unit]
 337 Description=Mail cert rsync
 338 After=multi-user.target
 339
 340 [Service]
 341 Type=oneshot
 342 ExecStart=/a/bin/log-quiet/sysd-mail-once mailcert /usr/local/bin/mail-cert-cron
 343 EOF
 344
 345 cat >/etc/systemd/system/mailcert.timer <<'EOF'
 346 [Unit]
 347 Description=Run mail-cert once a day
 348
 349 [Timer]
 350 OnCalendar=daily
 351
 352 [Install]
 353 WantedBy=timers.target
 354 EOF
 355 m systemctl daemon-reload
 356 m systemctl start mailcert
 357 m systemctl restart mailcert.timer
 358 m systemctl enable mailcert.timer
 359
 360
 361
 362 # * common exim4 config
 363 source /a/bin/bash_unpublished/source-state
 364
 365 if [[ ! $MAIL_HOST ]]; then
 366   err "\$MAIL_HOST not set"
 367 fi
 368
 369 m sudo gpasswd -a iank adm #needed for reading logs
 370
 371
 372 ### make local bounces go to normal maildir
 373 # local mail that bounces goes to /Maildir or /root/Maildir
 374 dirs=(/m/md/bounces/{cur,tmp,new})
 375 m mkdir -p ${dirs[@]}
 376 m chown iank:iank /m /m/md
 377 m ln -sfT /m/md /m/iank
 378 m chmod 700 /m /m/md
 379 m chown -R $u:Debian-exim /m/md/bounces
 380 m chmod 775 ${dirs[@]}
 381 m usermod -a -G Debian-exim $u
 382 for d in /Maildir /root/Maildir; do
 383   if [[ ! -L $d ]]; then
 384     m rm -rf $d
 385   fi
 386   m ln -sf -T /m/md/bounces $d
 387 done
 388
 389 # Note, even the server needs permissions of this file right
 390 # if it exists, so do this up here.
 391 f=/p/c/filesystem/etc/exim4/passwd.client
 392 if [[ ! -e $f ]]; then
 393   f=/p/c/machine_specific/$HOSTNAME/filesystem/etc/exim4/passwd.client
 394 fi
 395 m sudo rsync -ahhi --chown=root:Debian-exim --chmod=0640 $f /etc/exim4/
 396
 397 # by default, only 10 days of logs are kept. increase that.
 398 m sed -ri 's/^(\s*rotate\s).*/\11000/' /etc/logrotate.d/exim4-base
 399
 400
 401 ## https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
 402 # i only need .forwards, so just doing that one.
 403 cd /etc/exim4/conf.d/router
 404 b=userforward_higher_priority
 405 # replace the router name so it is unique
 406 sed -r s/^\\S+:/$b:/ 600_exim4-config_userforward >175_$b
 407
 408
 409 rm -vf /etc/exim4/conf.d/main/000_localmacros # old filename
 410 cat >/etc/exim4/conf.d/main/000_local <<EOF
 411 MAIN_TLS_ENABLE = true
 412
 413 # debian exim config added this in 2016 or so?
 414 # it's part of the smtp spec, to limit lines to 998 chars
 415 # but a fair amount of legit mail does not adhere to it. I don't think
 416 # this should be default, like it says in
 417 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828801
 418 # todo: the bug for introducing this was about headers, but
 419 # the fix maybe is for all lines? one says gmail rejects, the
 420 # other says gmail does not reject. figure out and open a new bug.
 421 IGNORE_SMTP_LINE_LENGTH_LIMIT = true
 422
 423 # more verbose logs
 424 MAIN_LOG_SELECTOR = +all
 425
 426
 427 # normally empty, I set this so I can set the envelope address
 428 # when doing mail redelivery to invoke filters. Also allows
 429 # me exiqgrep and stuff.
 430 MAIN_TRUSTED_GROUPS = $u
 431
 432 # default is 10. when exim has been down for a bit, fsf mailserver
 433 # will do a big send in one connection, then exim decides to put
 434 # the messages in the queue instead of delivering them, to avoid
 435 # spawning too many delivery processes. Pretty sure my system
 436 # can handle a lot more, but lets go with this.
 437 smtp_accept_queue_per_connection = 100
 438
 439
 440 DKIM_CANON = relaxed
 441 DKIM_SELECTOR = li
 442
 443 # from comments in
 444 # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
 445
 446 # The file is based on the outgoing domain-name in the from-header.
 447 DKIM_DOMAIN = \${lc:\${domain:\$h_from:}}
 448 # sign if key exists
 449 DKIM_PRIVATE_KEY= \${if exists{/etc/exim4/\${dkim_domain}-private.pem} {/etc/exim4/\${dkim_domain}-private.pem}}
 450
 451 # most of the ones that gmail seems to use.
 452 # Exim has horrible default of signing unincluded
 453 # list- headers since they got mentioned in an
 454 # rfc, but this messes up mailing lists, like gnu/debian which want to
 455 # keep your dkim signature intact but add list- headers.
 456 DKIM_SIGN_HEADERS = mime-version:in-reply-to:references:from:date:subject:to
 457 EOF
 458
 459 rm -fv /etc/exim4/rcpt_local_acl # old path
 460 cat >/etc/exim4/conf.d/rcpt_local_acl <<'EOF'
 461 # Only hosts we control send to @mail.iankelling.org, so make sure
 462 # they are all authed.
 463 # Note, if we wanted authed senders for all domains,
 464 # we could make this condition in acl_check_mail
 465 deny
 466   message = ian trusted domain recepient but no auth
 467   !authenticated = *
 468   domains = mail.iankelling.org
 469 EOF
 470 rm -fv /etc/exim4/data_local_acl # old path
 471 cat >/etc/exim4/conf.d/data_local_acl <<'EOF'
 472 # Except for the "condition =", this was
 473 # a comment in the check_data acl. The comment about this not
 474 # being suitable is mostly bs. The only thing related I found was to
 475 # add the condition =, cuz spamassassin has problems with big
 476 # messages and spammers don't bother with big messages,
 477 # but I've increased the size from 10k
 478 # suggested in official docs, and 100k in the wiki example because
 479 # those docs are rather old and I see a 110k spam message
 480 # pretty quickly looking through my spam folder.
 481 warn
 482   condition = ${if < {$message_size}{2000K}}
 483   spam = Debian-exim:true
 484   add_header = X-Spam_score: $spam_score\n\
 485             X-Spam_score_int: $spam_score_int\n\
 486             X-Spam_bar: $spam_bar\n\
 487             X-Spam_report: $spam_report
 488
 489 #accept
 490 #  spf = pass:fail:softfail:none:neutral:permerror:temperror
 491 #  dmarc_status = reject:quarantine
 492 #  add_header = Reply-to: dmarctest@iankelling.org
 493
 494 EOF
 495 cat >/etc/exim4/conf.d/auth/29_exim4-config_auth <<'EOF'
 496 # from 30_exim4-config_examples
 497
 498 plain_server:
 499 driver = plaintext
 500 public_name = PLAIN
 501 server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
 502 server_set_id = $auth2
 503 server_prompts = :
 504 .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
 505 server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
 506 .endif
 507 EOF
 508
 509 cat >/etc/exim4/conf.d/router/900_exim4-config_local_user <<'EOF'
 510 ### router/900_exim4-config_local_user
 511 #################################
 512
 513 # This router matches local user mailboxes. If the router fails, the error
 514 # message is "Unknown user".
 515
 516 local_user:
 517   debug_print = "R: local_user for $local_part@$domain"
 518   driver = accept
 519   domains = +local_domains
 520 # ian: commented this, in conjunction with a dovecot lmtp
 521 # change so I get mail for all users.
 522 #  check_local_user
 523   local_parts = ! root
 524   transport = LOCAL_DELIVERY
 525   cannot_route_message = Unknown user
 526 EOF
 527 cat >/etc/exim4/conf.d/transport/30_exim4-config_dovecot_lmtp <<'EOF'
 528 dovecot_lmtp:
 529         driver = lmtp
 530         socket = /var/run/dovecot/lmtp
 531         #maximum number of deliveries per batch, default 1
 532         batch_max = 200
 533 EOF
 534
 535 cat >/etc/exim4/host_local_deny_exceptions <<'EOF'
 536 mail.fsf.org
 537 *.posteo.de
 538 EOF
 539
 540 cat >/etc/exim4/conf.d/router/190_exim4-config_fsfsmarthost <<'EOF'
 541 # smarthost for fsf mail
 542 # ian: copied from /etc/exim4/conf.d/router/200_exim4-config_primary, and added senders = and
 543 # replaced DCsmarthost with mail.fsf.org
 544 fsfsmarthost:
 545   debug_print = "R: smarthost for $local_part@$domain"
 546   driver = manualroute
 547   domains = ! +local_domains
 548   senders = *@fsf.org
 549   transport = remote_smtp_smarthost
 550   route_list = * mail.fsf.org byname
 551   host_find_failed = ignore
 552   same_domain_copy_routing = yes
 553   no_more
 554 EOF
 555
 556
 557 cat >/etc/exim4/update-exim4.conf.conf  <<'EOF'
 558 # default stuff, i havent checked if its needed
 559 dc_minimaldns='false'
 560 dc_relay_nets=''
 561 CFILEMODE='644'
 562 dc_use_split_config='true'
 563 dc_local_interfaces=''
 564 dc_mailname_in_oh='true'
 565 EOF
 566
 567
 568 # ** dovecot
 569 dovecot-setup() {
 570   # based on a little google and package search, just the dovecot
 571   # packages we need instead of dovecot-common.
 572   #
 573   # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
 574   # directly.  The reason to do this is to use dovecot\'s sieve, which
 575   # has extensions that allow it to be almost equivalent to exim\'s
 576   # filter capabilities, some ways probably better, some worse, and
 577   # sieve has the benefit of being supported in postfix and
 578   # proprietary/weird environments, so there is more examples on the
 579   # internet. I was torn about whether to do this or not, meh.
 580   pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
 581
 582   for f in /p/c{/machine_specific/$HOSTNAME,}/filesystem/etc/dovecot/users; do
 583     e $f
 584     if [[ -e $f ]]; then
 585       m sudo rsync -ahhi --chown=root:dovecot --chmod=0640 $f /etc/dovecot/
 586       break
 587     fi
 588   done
 589   for f in /p/c/subdir_files/sieve/*sieve /a/c/subdir_files/sieve/*sieve; do
 590     m sudo -u $u /a/exe/lnf -T $f $uhome/sieve/${f##*/}
 591   done
 592   # If we changed 90-sieve.conf and removed the active part of the
 593   # sieve option, we wouldn\'t need this, but I\'d rather not modify a
 594   # default config if not needed. This won\'t work as a symlink in /a/c
 595   # unfortunately.
 596   if [[ -e $uhome/sieve/personal.sieve ]]; then
 597     m sudo -u $u /a/exe/lnf -T sieve/main.sieve $uhome/.dovecot.sieve
 598   fi
 599
 600   # we set this later in local.conf
 601   sed -ri -f - /etc/dovecot/conf.d/10-mail.conf <<'EOF'
 602 /^\s*mail_location\s*=/d
 603 EOF
 604
 605   cat >/etc/dovecot/conf.d/20-lmtp.conf <<EOF
 606 protocol lmtp {
 607 #per https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
 608   mail_plugins = \$mail_plugins sieve
 609 # default was
 610   #mail_plugins = \$mail_plugins
 611
 612 # For a normal setup with exim, we need something like this, which
 613 # removes the domain part
 614 #  auth_username_format = %Ln
 615 #
 616 #  or else # Exim says something like
 617 #  "LMTP error after RCPT ... 550 ... User doesn't exist someuser@somedomain"
 618 # Dovecot verbose log says something like
 619 # "auth-worker(9048): passwd(someuser@somedomain): unknown user"
 620 # reference: http://wiki.dovecot.org/LMTP/Exim
 621 #
 622 # However, I use this to direct all mail to the same inbox.
 623 # A normal way to do this, which I did at first is to have
 624 # a router in exim almost at the end, eg 950,
 625 #local_catchall:
 626 #  debug_print = "R: catchall for \$local_part@\$domain"
 627 #  driver = redirect
 628 #  domains = +local_domains
 629 #  data = $u
 630 # based on
 631 # http://blog.alteholz.eu/2015/04/exim4-and-catchall-email-address/
 632 # with superflous options removed.
 633 # However, this causes the envelope to be rewritten,
 634 # which makes filtering into mailboxes a little less robust or more complicated,
 635 # so I've done it this way instead. it also requires
 636 # modifying the local router in exim.
 637   auth_username_format = $u
 638 }
 639
 640 EOF
 641
 642
 643   cat >/etc/dovecot/local.conf <<EOF
 644 # so I can use a different login that my shell login for mail.  this is
 645 # worth doing solely for the reason that if this login is compromised,
 646 # it won't also compromise my shell password.
 647 !include conf.d/auth-passwdfile.conf.ext
 648
 649 # settings derived from wiki and 10-ssl.conf
 650 ssl = required
 651 ssl_cert = </etc/exim4/exim.crt
 652 ssl_key = </etc/exim4/exim.key
 653 # https://github.com/certbot/certbot/raw/master/certbot-apache/certbot_apache/options-ssl-apache.conf
 654 # in my cert cronjob, I check if that has changed upstream.
 655 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
 656
 657 # ian: added this, more secure, per google etc
 658 ssl_prefer_server_ciphers = yes
 659
 660 # ian: %u is used for alerts user vs iank
 661 mail_location = maildir:/m/%u:LAYOUT=fs:INBOX=/m/%u/INBOX
 662 mail_uid = $u
 663 mail_gid = $u
 664
 665 # for debugging info, uncomment these.
 666 # logs go to syslog and to /var/log/mail.log
 667 # auth_verbose=yes
 668 #mail_debug=yes
 669 EOF
 670   ####### end dovecot-setup ########
 671 }
 672
 673
 674
 675 # * if MAIL_HOST
 676 case $HOSTNAME in
 677   $MAIL_HOST)
 678     dovecot-setup
 679
 680     # ** exim
 681
 682     sudo rsync -ahhi --chown=root:Debian-exim --chmod=0640 \
 683          /p/c/filesystem/etc/exim4/passwd /p/c/filesystem/etc/exim4/*.pem /etc/exim4/
 684
 685
 686     # mail.iankelling.org so local imap clients can connect with tls and
 687     # when they happen to not be local.
 688     sed -ri -f - /etc/hosts <<'EOF'
 689 /^127\.0\.1\.1.* mail\.iankelling\.org\b/{p;d}
 690 /^127\.0\.1\.1 /s/ *$/ mail.iankelling.org/
 691 EOF
 692     /a/exe/cedit mail /etc/dnsmasq-servers.conf <<'EOF' || [[ $? == 1 ]]
 693 server=/mail.iankelling.org/127.0.1.1
 694 EOF
 695     if systemctl is-active dnsmasq >/dev/null; then
 696       m systemctl restart dnsmasq
 697       m nscd -i hosts
 698     fi
 699
 700     # I used to use debconf-set-selections + dpkg-reconfigure,
 701     # which then updates this file
 702     # but the process is slower than updating it directly and then I want to set other things in
 703     # update-exim4.conf.conf, so there's no point.
 704     # The file is documented in man update-exim4.conf,
 705     # except the man page is not perfect, read the bash script to be sure about things.
 706
 707     # The debconf questions output is additional documentation that is not
 708     # easily accessible, but super long, along with the initial default comment in this
 709     # file, so I've saved that into ./mail-notes.conf.
 710
 711     cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 712 # note: some things we don't set that are here by default because they are unused.
 713
 714 dc_eximconfig_configtype='internet'
 715
 716 # man page: is used to build the local_domains list, together with "localhost"
 717 # iank.bid is for testing
 718 # mail.iankelling.org is for machines i own
 719 dc_other_hostnames='*.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org;*.b8.nz;b8.nz'
 720
 721 # from man page:
 722 # Is  a  list  of  domains for which we accept mail from anywhere on the Internet but which are not delivered locally, e.g.
 723 # because this machine serves as secondary MX for these domains. Sets MAIN_RELAY_TO_DOMAINS.
 724 # todo: we should not accept from anywhere, only the mx for fsf.
 725 dc_relay_domains='*.fsf.org;fsf.org'
 726 dc_localdelivery='dovecot_lmtp'
 727 EOF
 728
 729
 730     # the debconf output about mailname is as follows:
 731     # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
 732     # name.
 733     # This name will also be used by other programs. It should be the single, fully
 734     # qualified domain name (FQDN).
 735     # Thus, if a mail address on the local host is foo@example.org, the correct value for
 736     # this option would be example.org.
 737     # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
 738
 739     echo mail.iankelling.org > /etc/mailname
 740
 741     # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
 742     # smarthost config type, not sure. all other settings
 743     # would be unused in that config type.
 744     cat >>/etc/exim4/conf.d/main/000_local <<EOF
 745 # enable 587 in addition to the default 25, so that
 746 # i can send mail where port 25 is firewalled by isp
 747 daemon_smtp_ports = 25 : 587
 748
 749
 750
 751 # failing message on mail-tester.com:
 752 # We check if there is a server (A Record) behind your hostname kd.
 753 # You may want to publish a DNS record (A type) for the hostname kd or use a different hostname in your mail software
 754 # https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
 755 # and this one seemed appropriate from grepping config.
 756 # I originally set this to li.iankelling.org, but then ended up with errors when li tried to send
 757 # mail to kd, so this should basically be a name that no host has as their
 758 # canonical hostname since the actual host sits behind a nat and changes.
 759 # Seems logical for this to be the same as mailname.
 760 MAIN_HARDCODE_PRIMARY_HOSTNAME = mail.iankelling.org
 761
 762 # options exim has to avoid having to alter the default config files
 763 CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/conf.d/rcpt_local_acl
 764 CHECK_DATA_LOCAL_ACL_FILE = /etc/exim4/conf.d/data_local_acl
 765
 766
 767 # recommended if dns is expected to work
 768 CHECK_RCPT_VERIFY_SENDER = true
 769 # seems like a good idea
 770 CHECK_DATA_VERIFY_HEADER_SENDER = true
 771 CHECK_RCPT_SPF = true
 772 CHECK_RCPT_REVERSE_DNS = true
 773 CHECK_MAIL_HELO_ISSUED = true
 774
 775 # testing dmarc
 776 #dmarc_tld_file = /etc/public_suffix_list.dat
 777 EOF
 778
 779     f=/etc/cron.daily/refresh-dmarc-tld-file
 780     cat >$f <<'EOF'
 781 #!/bin/bash
 782 cd /etc
 783 wget -q -N https://publicsuffix.org/list/public_suffix_list.dat
 784 EOF
 785     m chmod 755 $f
 786
 787     sed -i --follow-symlinks -f - /etc/aliases <<EOF
 788 \$a root: $postmaster
 789 /^root:/d
 790 EOF
 791
 792
 793     # https://selivan.github.io/2017/12/30/systemd-serice-always-restart.html
 794     d=/etc/systemd/system/openvpn@mail.service.d
 795     m mkdir -p $d
 796     cat >$d/override.conf <<'EOF'
 797 [Service]
 798 Restart=always
 799 # time to sleep before restarting a service
 800 RestartSec=1
 801
 802 [Unit]
 803 # StartLimitIntervalSec in recent systemd versions
 804 StartLimitInterval=0
 805 EOF
 806     if ! systemctl cat openvpn@mail.service|grep -xF StartLimitInterval=0 &>/dev/null; then
 807       # needed for the above config to go into effect
 808       m systemctl daemon-reexec
 809     fi
 810
 811
 812     m systemctl enable mailclean.timer
 813     m systemctl start mailclean.timer
 814     m systemctl restart $vpn_ser@mail
 815     m systemctl enable $vpn_ser@mail
 816     m systemctl enable dovecot
 817     m systemctl restart dovecot
 818     ;;
 819   # * not MAIL_HOST
 820   *) # $HOSTNAME != $MAIL_HOST
 821     # remove mail. 2 lines to properly remove whitespace
 822     sed -ri -f - /etc/hosts <<'EOF'
 823 s#^(127\.0\.1\.1 .*) +mail\.iankelling\.org$#\1#
 824 s#^(127\.0\.1\.1 .*)mail\.iankelling\.org +(.*)#\1\2#
 825 EOF
 826
 827     echo | /a/exe/cedit mail /etc/dnsmasq-servers.conf || [[ $? == 1 ]]
 828     if systemctl is-active dnsmasq >/dev/null; then
 829       m nscd -i hosts
 830       m systemctl restart dnsmasq # reload does not ensure new config is used
 831     fi
 832
 833     m systemctl disable mailclean.timer &>/dev/null ||:
 834     m systemctl stop mailclean.timer &>/dev/null ||:
 835     m systemctl disable $vpn_ser@mail
 836     m systemctl stop $vpn_ser@mail
 837     #
 838     #
 839     # would only exist because I wrote it i the previous condition,
 840     # it\'s not part of exim
 841     rm -fv /etc/exim4/conf.d/main/000_localmacros
 842     cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 843 dc_eximconfig_configtype='smarthost'
 844 dc_smarthost='$smarthost'
 845 # The manpage incorrectly states this will do header rewriting, but
 846 # that only happens if we have dc_hide_mailname is set.
 847 dc_readhost='iankelling.org'
 848 EOF
 849
 850     hostname -f >/etc/mailname
 851
 852
 853     ;;&
 854   ## we use this host to monitor MAIL_HOST
 855   l2)
 856     dovecot-setup
 857     m systemctl enable dovecot
 858     m systemctl restart dovecot
 859     cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 860 # man page: is used to build the local_domains list, together with "localhost"
 861 # mail.iankelling.org is for machines i own
 862 dc_other_hostnames='l2.b8.nz'
 863 dc_localdelivery='dovecot_lmtp'
 864 EOF
 865     # This ends up at alerts mailbox on MAIL_HOST, but using a user that doesn't exist elsewhere
 866     # is no good.
 867     sed -i --follow-symlinks -f - /etc/aliases <<EOF
 868 \$a root: iank
 869 /^root:/d
 870 EOF
 871     ;;
 872   # not l2 and not MAIL_HOST
 873   *)
 874
 875
 876     # This ends up at alerts mailbox on MAIL_HOST, but using a user that doesn't exist elsewhere
 877     # is no good.
 878     sed -i --follow-symlinks -f - /etc/aliases <<EOF
 879 \$a root: root@mail.iankelling.org
 880 /^root:/d
 881 EOF
 882     cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 883 # Only used in case of bounces.
 884 dc_localdelivery='maildir_home'
 885 EOF
 886     m systemctl disable dovecot ||:
 887     m systemctl stop dovecot ||:
 888     ;;
 889 esac # end $HOSTNAME != $MAIL_HOST
 890
 891 # * spool dir setup
 892
 893 # ** bind mount setup
 894 # put spool dir in directory that spans multiple distros.
 895 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
 896 #
 897 # todo: I\'m suspicious of uids for Debian-exim being the same across
 898 # distros. It would be good to test this.
 899 dir=/nocow/exim4
 900 sdir=/var/spool/exim4
 901 # we only do this if our system has $dir
 902
 903 # this used to do a symlink, but, in the boot logs, /nocow would get mounted succesfully,
 904 # about 2 seconds later, exim starts, and immediately puts into paniclog:
 905 # honVi-0000u3-82 Failed to create directory "/var/spool/exim4/input": No such file or directory
 906 # so, im trying a bind mount to get rid of that.
 907 if [[ -e /nocow ]]; then
 908   if ! grep -Fx "/nocow/exim4  /var/spool/exim4  none  bind  0 0" /etc/fstab; then
 909     echo "/nocow/exim4  /var/spool/exim4  none  bind  0 0" >>/etc/fstab
 910   fi
 911   if ! mountpoint -q $sdir; then
 912     m systemctl stop exim4
 913     if [[ -L $sdir ]]; then
 914       m rm $sdir
 915     fi
 916     if [[ ! -e $dir && -d $sdir ]]; then
 917       m mv $sdir $dir
 918     fi
 919     if [[ ! -d $sdir ]]; then
 920       m mkdir $sdir
 921       m chmod 000 $sdir # only want it to be used when its mounted
 922     fi
 923     m mount $sdir
 924   fi
 925 fi
 926
 927
 928
 929 # ** exim/spool uid setup
 930 # i have the spool directory be common to distro multi-boot, so
 931 # we need the uid to be the same. 608 cuz it's kind of in the middle
 932 # of the free system uids.
 933 IFS=:; read -r _ _ uid _ < <(getent passwd Debian-exim ||:) ||:; unset IFS
 934 IFS=:; read -r _ _ gid _ < <(getent group Debian-exim ||:) ||:; unset IFS
 935 if [[ ! $uid ]]; then
 936   # from /var/lib/dpkg/info/exim4-base.postinst, plus uid and gid options
 937   m adduser --uid 608 --system --group --quiet --home /var/spool/exim4 \
 938     --no-create-home --disabled-login --force-badname Debian-exim
 939 elif [[ $uid != 608 ]]; then
 940   m systemctl stop exim4 ||:
 941   m usermod -u 608 Debian-exim
 942   m groupmod -g 608 Debian-exim
 943   m usermod -g 608 Debian-exim
 944   m find / /nocow -xdev -uid $uid -exec chown -h 608 {} +
 945   m find / /nocow -xdev -gid $gid -exec chgrp -h 608 {} +
 946 fi
 947
 948
 949
 950
 951 # * reload exim
 952
 953 if systemctl is-active exim4 >/dev/null; then
 954   m systemctl reload exim4
 955 else
 956   m systemctl start exim4
 957 fi
 958
 959
 960 # * mail monitoring / testing
 961
 962 case $HOSTNAME in
 963   $MAIL_HOST|l2)
 964     # note: cronjob "ian" also does some important monitoring
 965     cat >/etc/cron.d/mailtest <<EOF
 966 SHELL=/bin/bash
 967 PATH=/usr/bin:/bin:/usr/local/bin
 968 */5 * * * *   $u send-test-forward |& log-once send-test-forward
 969 */10 * * * *   root chmod -R g+rw /m/md/bounces |& log-once -1 bounces-chmod
 970 EOF
 971     ;;&
 972   $MAIL_HOST)
 973     test_from=ian@iankelling.org
 974     test_to=iank@posteo.de
 975
 976     cat >>/etc/cron.d/mailtest <<EOF
 977 */5 * * * *   $u mailtest-check |& log-once -1 mailtest-check
 978 2   * * * *   $u check-remote-mailqs |& log-once check-remote-mailqs
 979 EOF
 980     m sudo rsync -ahhi --chown=root:root --chmod=0755 \
 981       /b/ds/mailtest-check /b/ds/check-remote-mailqs /usr/local/bin/
 982     ;;&
 983   l2)
 984     test_from=iank@l2.b8.nz
 985     test_to=testignore@iankelling.org
 986     ;;&
 987   $MAIL_HOST|l2)
 988     cat >/usr/local/bin/send-test-forward <<EOFOUTER
 989 #!/bin/bash
 990 /usr/sbin/exim -t <<EOF
 991 From: $test_from
 992 To: $test_to
 993 Subject: primary_test \$(date +%s) \$(date +%Y-%m-%dT%H:%M:%S%z)
 994
 995 eom
 996 EOF
 997 EOFOUTER
 998     m chmod +x /usr/local/bin/send-test-forward
 999     ;;
1000   *)
1001     rm -fv /etc/cron.d/mailtest
1002     ;;
1003 esac
1004
1005
1006
1007 # * misc
1008 m sudo -u $u ln -sf -T /m/.mu /home/$u/.mu
1009
1010
1011 # /etc/alias setup is debian specific, and exim postinst script sets up
1012 # an /etc/alias from root to the postmaster, based on the question
1013 # exim4-config exim4/dc_postmaster, as long as there exists an entry for
1014 # root, or there was no preexisting aliases file. postfix won\'t set up
1015 # a root to $postmaster alias if it\'s already installed. Easiest to
1016 # just set it ourselves.
1017
1018 # debconf question for postmaster:
1019 # Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
1020 # to the user account of the actual system administrator.
1021 # If this value is left empty, such mail will be saved in /var/mail/mail, which is not
1022 # recommended.
1023 # Note that postmaster\'s mail should be read on the system to which it is directed,
1024 # rather than being forwarded elsewhere, so (at least one of) the users listed here
1025 # should not redirect their mail off this machine. A 'real-' prefix can be used to
1026 # force local delivery.
1027 # Multiple user names need to be separated by spaces.
1028 # Root and postmaster mail recipient:
1029
1030
1031 exit 0
1032 :