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
  15 # TODO: copy dkim keys from within this file. its now done in conflink.
  16 # TODO: fix dkim key to b chmod 640, group Debian-exim
  17
  18 if [[ -s /usr/local/lib/err ]]; then
  19   source /usr/local/lib/err
  20 elif [[ -s /a/bin/errhandle/err ]]; then
  21   source /a/bin/errhandle/err
  22 else
  23   err "no err tracing script found"
  24   exit 1
  25 fi
  26
  27 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
  28 if [[ ! $SUDO_USER ]]; then
  29   echo "$0: error: requires running as nonroot or sudo"
  30   exit 1
  31 fi
  32 u=$SUDO_USER
  33
  34
  35 usage() {
  36   cat <<EOF
  37 Usage: ${0##*/}
  38 Setup exim4 & dovecot & related things
  39
  40 The minimal assumption we have is that /etc/mailpass exists
  41
  42
  43 -h|--help  Print help and exit.
  44 EOF
  45   exit $1
  46 }
  47
  48
  49
  50 ####### instructions for icedove #####
  51 # Incoming mail server: mail.iankelling.org, port 143, username iank, connection security starttls, authentication method normal password
  52 # we could also just use 127.0.0.1 with no ssl, but todo: disable that in dovecot, so mail is secure from local programs.
  53 #
  54 # hamburger -> preferences -> preferences -> advanced tab -> config editor button -> security.ssl.enable_ocsp_must_staple = false
  55 # background: ovecot does not yet have ocsp stapling support
  56 # reference: https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921
  57 #
  58 # for phone, same thing but username alerts, pass in ivy-pass.
  59 #######
  60
  61
  62 # * perstent password instructions
  63 # # exim passwords:
  64 # # for hosts which have all private files I just use the same user
  65 # # for other hosts, each one get\'s their own password.
  66 # # for generating secure pass, and storing for server too:
  67 # # user=USUALLY_SAME_AS_HOSTNAME
  68 # user=li
  69 # f=$(mktemp)
  70 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  71 # s sed -i "/^$user:/d" /p/c/filesystem/etc/exim4/passwd
  72 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
  73 # # todo: port is no longer used in mailpass, remove it.
  74 # echo "mail.iankelling.org 587 $user:$(<$f)" >> /p/c/machine_specific/$user/filesystem/etc/mailpass
  75 # # then run this script, or part of it which uses /etc/mailpass
  76
  77 # # dovecot password, i just need 1 as I\'m the only user
  78 # mkdir /p/c/filesystem/etc/dovecot
  79 # echo "iank:$(doveadm pw -s ssha256)::::::" >>/p/c/filesystem/etc/dovecot/users
  80 # conflink
  81
  82
  83
  84 # # for ad-hoc testing of some random new host sending mail:
  85 # user=li # client host username & hostname
  86 # f=$(mktemp)
  87 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  88 # s sed -i "/^$user:/d" /etc/exim4/passwd
  89 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" | s tee -a /etc/exim4/passwd
  90 # echo "mail.iankelling.org:$user:$(<$f)" | ssh root@$user dd of=/etc/exim4/passwd.client
  91 ####### end perstent password instructions ######
  92
  93
  94 # * persistent dkim/dns instructions
  95 # # Remove 1 level of comments in this section, set the domain var
  96 # # for the domain you are setting up, then run this and copy dns settings
  97 # # into dns.
  98 # domain=iankelling.org
  99 # c /p/c/filesystem/etc/exim4
 100 # # this has several bugs addressed in comments, but it was helpful
 101 # # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
 102
 103 # openssl genrsa -out $domain-private.pem 2048 -outform PEM
 104 # openssl rsa -in $domain-private.pem -out $domain.pem -pubout -outform PEM
 105 # # selector is needed for having multiple keys for one domain.
 106 # # I dun do that, so just use a static one: li
 107 # echo "txt record name: li._domainkey.$domain"
 108 # # Debadmin page does not have v=, fastmail does, and this
 109 # # says it\'s recommended in 3.6.1, default is DKIM1 anyways.
 110 # # https://www.ietf.org/rfc/rfc6376.txt
 111 # # Join and print all but first and last line.
 112 # # last line: swap hold & pattern, remove newlines, print.
 113 # # lines 2+: append to hold space
 114 # echo "txt record contents:"
 115 # echo "v=DKIM1; k=rsa; p=$(sed -n '${x;s/\n//gp};2,$H' $domain.pem)"
 116 # chmod 644 $domain.pem
 117 # chmod 640 $domain-private.pem
 118 # # in conflink, we chown these to group debian
 119 # conflink
 120 # # selector was also put into /etc/exim4/conf.d/main/000_local,
 121 # # via the mail-setup scripts
 122
 123 # # 2017-02 dmarc policies:
 124 # # host -t txt _dmarc.gmail.com
 125 # # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
 126 # # there were articles claiming gmail would be  changing
 127 # # to p=reject, in early 2017, which didn\'t happen. I see no sources on them. It\'s
 128 # # expected to cause problems
 129 # # with a few old mailing lists, copying theirs for now.
 130 #
 131 # echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
 132
 133 # # 2017-02 spf policies:
 134 # # host -t txt lists.fedoraproject.org
 135 # # google ~all, hotmail ~all, yahoo: ?all, fastmail ?all, outlook ~all
 136 # # i include fastmail\'s settings, per their instructions,
 137 # # and follow their policy. In mail in a box, or similar instructions,
 138 # # I\'ve seen recommended to not use a restrictive policy.
 139
 140 # # to check if dns has updated, you do
 141 # host -a mesmtp._domainkey.$domain
 142
 143 # # mx records,
 144 # # setting it to iankelling.org would work the same, but this
 145 # # is more flexible, I could change where mail.iankelling.org pointed.
 146 # cat <<'EOF'
 147 # mx records, 2 records each, for * and empty domain
 148 # pri 10 mail.iankelling.org
 149 # EOF
 150 ####### end  persistent dkim instructions #########
 151
 152
 153 # * functions  constants
 154 e() { printf "%s\n" "$*"; }
 155 pi() { # package install
 156   local f
 157   if dpkg -s -- "$@" &> /dev/null; then
 158     return 0;
 159   fi;
 160   while fuser /var/lib/dpkg/lock &>/dev/null; do sleep 1; done
 161   f=/var/cache/apt/pkgcache.bin;
 162   if [[ ! -r $f ]] || (( $(( $(date +%s) - $(stat -c %Y $f ) )) > 60*60*12 )); then
 163     m apt-get update
 164   fi
 165   m DEBIAN_FRONTEND=noninteractive apt-get -y install --purge --auto-remove "$@"
 166 }
 167
 168 postmaster=alerts
 169 mxhost=mail.iankelling.org
 170 mxport=587
 171 forward=$u@$mxhost
 172
 173 # old setup. left as comment for example
 174 # mxhost=mail.messagingengine.com
 175 # mxport=587
 176 # forward=ian@iankelling.org
 177
 178 smarthost="$mxhost::$mxport"
 179
 180 ## * Install packages
 181 # light version of exim does not have sasl auth support.
 182 pi exim4-daemon-heavy spamassassin spf-tools-perl openvpn dnsmasq
 183
 184 # trisquel 8 = openvpn, debian stretch = openvpn-client
 185 vpn_ser=openvpn-client
 186 if [[ ! -e /lib/systemd/system/openvpn-client@.service ]]; then
 187   vpn_ser=openvpn
 188 fi
 189
 190 uhome=$(eval echo ~$u)
 191 ### * user forward file
 192 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 193   # afaik, these will get ignored because they are routing to my own
 194   # machine, but rm them is safer
 195   rm -fv $uhome/.forward /root/.forward
 196 else
 197   # this can\'t be a symlink and has permission restrictions
 198   # it might work in /etc/aliases, but this seems more proper.
 199   e setting $uhome/.forward to $forward
 200   install -m 644 {-o,-g}$u <(e $forward) $uhome/.forward
 201 fi
 202
 203 # * Mail clean cronjob
 204
 205 cat >/etc/systemd/system/mailclean.timer <<'EOF'
 206 [Unit]
 207 Description=Run mailclean daily
 208
 209 [Timer]
 210 OnCalendar=monthly
 211
 212 [Install]
 213 WantedBy=timers.target
 214 EOF
 215
 216 cat >/etc/systemd/system/mailclean.service <<EOF
 217 [Unit]
 218 Description=Delete and archive old mail files
 219 After=multi-user.target
 220
 221 [Service]
 222 User=$u
 223 Type=oneshot
 224 ExecStart=/a/bin/log-quiet/sysd-mail-once mailclean /a/bin/distro-setup/mailclean
 225 EOF
 226
 227 systemctl daemon-reload
 228
 229
 230 # * spamassassin
 231
 232 if [[ $HOSTNAME != "$MAIL_HOST" ]]; then
 233   m systemctl stop spamassassin
 234   m systemctl disable spamassassin
 235 else
 236
 237   # per readme.debian
 238   sed -i '/^\s*CRON\s*=/d' /etc/default/spamassassin
 239   e CRON=1 >>/etc/default/spamassassin
 240   # just noticed this in the config file, seems like a good idea.
 241   sed -i '/^\s*NICE\s*=/d' /etc/default/spamassassin
 242   e 'NICE="--nicelevel 15"' >>/etc/default/spamassassin
 243
 244   m systemctl enable spamassassin
 245   m systemctl start spamassassin
 246   m systemctl reload spamassassin
 247
 248   cat >/etc/systemd/system/spamddnsfix.service <<'EOF'
 249 [Unit]
 250 Description=spamd dns bug fix cronjob
 251
 252 [Service]
 253 Type=oneshot
 254 ExecStart=/a/bin/distro-setup/spamd-dns-fix
 255 EOF
 256   # 2017-09, debian closed the bug on this saying upstream had fixed it.
 257   # remove this when i\'m using the newer package, ie, debian 10, or maybe
 258   # ubuntu 18.04.
 259   cat >/etc/systemd/system/spamddnsfix.timer <<'EOF'
 260 [Unit]
 261 Description=run spamd bug fix script every 10 minutes
 262
 263 [Timer]
 264 OnActiveSec=60
 265 # the script looks back 9 minutes into the journal,
 266 # it takes a second to run,
 267 # so lets run every 9 minutes and 10 seconds.
 268 OnUnitActiveSec=550
 269
 270 [Install]
 271 WantedBy=timers.target
 272 EOF
 273   m systemctl daemon-reload
 274   m systemctl restart spamddnsfix.timer
 275   m systemctl enable spamddnsfix.timer
 276
 277 fi # [[ $HOSTNAME != "$MAIL_HOST" ]]
 278 #####   end spamassassin config
 279
 280
 281 # * Update mail cert
 282 if [[ -e /p/c/filesystem ]]; then
 283   # allow failure of these commands when our internet is down, they are likely not needed,
 284   # we check that a valid cert is there already.
 285   # to put the hostname in the known hosts
 286   if ! ssh -o StrictHostKeyChecking=no root@li.iankelling.org :; then
 287     # This just causes failure if our cert is going to expire in the next 30 days.
 288     # Certs I generate last 10 years.
 289     openssl x509 -checkend $(( 60 * 60 * 24 * 30 )) -noout -in /etc/openvpn/mail.crt
 290   else
 291     # note, man openvpn implies we could just call mail-route on vpn startup/shutdown with
 292     # systemd, buuut it can remake the tun device unexpectedly, i got this in the log
 293     # after my internet was down for a bit:
 294     # NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.
 295     m /a/exe/vpn-mk-client-cert -b mail -n mail -s /b/ds/mail-route li.iankelling.org
 296   fi
 297 fi
 298
 299
 300
 301 f=/usr/local/bin/mail-cert-cron
 302 cat >$f <<'EOF'
 303 #!/bin/bash
 304 set -eE -o pipefail
 305 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 306
 307 [[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"
 308
 309 f=/a/bin/bash_unpublished/source-state
 310 if [[ -e $f ]]; then
 311     source $f
 312 fi
 313 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 314     local_mx=mail.iankelling.org
 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
 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 -R $u:Debian-exim /m/md/bounces
 371 m chmod 775 ${dirs[@]}
 372 m usermod -a -G Debian-exim $u
 373 for d in /Maildir /root/Maildir; do
 374   if [[ ! -L $d ]]; then
 375     m rm -rf $d
 376   fi
 377   m ln -sf -T /m/md/bounces $d
 378 done
 379
 380
 381 ### begin setup passwd.client
 382 f=/etc/exim4/passwd.client
 383 rm -fv /etc/exim4/passwd.client
 384 m install -m 640 -g Debian-exim /dev/null $f
 385 while read -r domain _ pass; do
 386   # reference: exim4_passwd_client(5)
 387   printf "%s:%s\n" "$domain" "$pass" >>$f
 388 done </etc/mailpass
 389 ###  end setup passwd.client
 390
 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
 393
 394
 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/exim4/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
 401
 402
 403 m rm -f /etc/exim4/conf.d/main/000_localmacros # old filename
 404 cat >/etc/exim4/conf.d/main/000_local <<EOF
 405 MAIN_TLS_ENABLE = true
 406
 407
 408 # debian exim config added this in 2016 or so?
 409 # it's part of the smtp spec, to limit lines to 998 chars
 410 # but a fair amount of legit mail does not adhere to it. I don't think
 411 # this should be default, like it says in
 412 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828801
 413 # todo: the bug for introducing this was about headers, but
 414 # the fix maybe is for all lines? one says gmail rejects, the
 415 # other says gmail does not reject. figure out and open a new bug.
 416 IGNORE_SMTP_LINE_LENGTH_LIMIT = true
 417
 418 # more verbose logs
 419 MAIN_LOG_SELECTOR = +all
 420
 421 EOF
 422
 423 rm -fv /etc/exim4/rcpt_local_acl # old path
 424 cat >/etc/exim4/conf.d/rcpt_local_acl <<'EOF'
 425 # Only hosts we control send to @mail.iankelling.org, so make sure
 426 # they are all authed.
 427 # Note, if we wanted authed senders for all domains,
 428 # we could make this condition in acl_check_mail
 429 deny
 430   message = ian trusted domain recepient but no auth
 431   !authenticated = *
 432   domains = mail.iankelling.org
 433 EOF
 434 rm -fv /etc/exim4/data_local_acl # old path
 435 cat >/etc/exim4/conf.d/data_local_acl <<'EOF'
 436 # Except for the "condition =", this was
 437 # a comment in the check_data acl. The comment about this not
 438 # being suitable is mostly bs. The only thing related I found was to
 439 # add the condition =, cuz spamassassin has problems with big
 440 # messages and spammers don't bother with big messages,
 441 # but I've increased the size from 10k
 442 # suggested in official docs, and 100k in the wiki example because
 443 # those docs are rather old and I see a 110k spam message
 444 # pretty quickly looking through my spam folder.
 445 warn
 446   condition = ${if < {$message_size}{2000K}}
 447   spam = Debian-exim:true
 448   add_header = X-Spam_score: $spam_score\n\
 449             X-Spam_score_int: $spam_score_int\n\
 450             X-Spam_bar: $spam_bar\n\
 451             X-Spam_report: $spam_report
 452
 453 #accept
 454 #  spf = pass:fail:softfail:none:neutral:permerror:temperror
 455 #  dmarc_status = reject:quarantine
 456 #  add_header = Reply-to: dmarctest@iankelling.org
 457
 458 EOF
 459 cat >/etc/exim4/conf.d/auth/29_exim4-config_auth <<'EOF'
 460 # from 30_exim4-config_examples
 461
 462 plain_server:
 463 driver = plaintext
 464 public_name = PLAIN
 465 server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
 466 server_set_id = $auth2
 467 server_prompts = :
 468 .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
 469 server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
 470 .endif
 471 EOF
 472
 473 cat >/etc/exim4/conf.d/router/900_exim4-config_local_user <<'EOF'
 474 ### router/900_exim4-config_local_user
 475 #################################
 476
 477 # This router matches local user mailboxes. If the router fails, the error
 478 # message is "Unknown user".
 479
 480 local_user:
 481   debug_print = "R: local_user for $local_part@$domain"
 482   driver = accept
 483   domains = +local_domains
 484 # ian: commented this, in conjunction with a dovecot lmtp
 485 # change so I get mail for all users.
 486 #  check_local_user
 487   local_parts = ! root
 488   transport = LOCAL_DELIVERY
 489   cannot_route_message = Unknown user
 490 EOF
 491 cat >/etc/exim4/conf.d/transport/30_exim4-config_dovecot_lmtp <<'EOF'
 492 dovecot_lmtp:
 493         driver = lmtp
 494         socket = /var/run/dovecot/lmtp
 495         #maximum number of deliveries per batch, default 1
 496         batch_max = 200
 497 EOF
 498
 499 cat >/etc/exim4/host_local_deny_exceptions <<'EOF'
 500 mail.fsf.org
 501 *.posteo.de
 502 EOF
 503
 504 cat >/etc/exim4/conf.d/router/190_exim4-config_fsfsmarthost <<'EOF'
 505 # smarthost for fsf mail
 506 # ian: copied from /etc/exim4/conf.d/router/200_exim4-config_primary, and added senders = and
 507 # replaced DCsmarthost with mail.fsf.org
 508 fsfsmarthost:
 509   debug_print = "R: smarthost for $local_part@$domain"
 510   driver = manualroute
 511   domains = ! +local_domains
 512   senders = *@fsf.org
 513   transport = remote_smtp_smarthost
 514   route_list = * mail.fsf.org byname
 515   host_find_failed = ignore
 516   same_domain_copy_routing = yes
 517   no_more
 518 EOF
 519
 520
 521 cat >/etc/exim4/update-exim4.conf.conf  <<'EOF'
 522 # default stuff, i havent checked if its needed
 523 dc_minimaldns='false'
 524 dc_relay_nets=''
 525 CFILEMODE='644'
 526 dc_use_split_config='true'
 527 dc_local_interfaces=''
 528 dc_mailname_in_oh='true'
 529 EOF
 530
 531 # * if MAIL_HOST
 532 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 533   # ** dovecot
 534   ####### begin dovecot setup ########
 535   # based on a little google and package search, just the dovecot
 536   # packages we need instead of dovecot-common.
 537   #
 538   # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
 539   # directly.  The reason to do this is to use dovecot\'s sieve, which
 540   # has extensions that allow it to be almost equivalent to exim\'s
 541   # filter capabilities, some ways probably better, some worse, and
 542   # sieve has the benefit of being supported in postfix and
 543   # proprietary/weird environments, so there is more examples on the
 544   # internet. I was torn about whether to do this or not, meh.
 545   pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
 546
 547   for f in /p/c/subdir_files/sieve/*sieve /a/c/subdir_files/sieve/*sieve; do
 548     m sudo -u $u /a/exe/lnf -T $f $uhome/sieve/${f##*/}
 549   done
 550   # if we changed 90-sieve.conf and removed the active part of the
 551   # sieve option, we wouldn\'t need this, but I\'d rather not modify a
 552   # default config if not needed. This won\'t work as a symlink in /a/c
 553   # unfortunately.
 554   m sudo -u $u /a/exe/lnf -T sieve/main.sieve $uhome/.dovecot.sieve
 555
 556   # we set this later in local.conf
 557   sed -ri -f - /etc/dovecot/conf.d/10-mail.conf <<'EOF'
 558 /^\s*mail_location\s*=/d
 559 EOF
 560
 561   cat >/etc/dovecot/conf.d/20-lmtp.conf <<EOF
 562 protocol lmtp {
 563 #per https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
 564   mail_plugins = \$mail_plugins sieve
 565 # default was
 566   #mail_plugins = \$mail_plugins
 567
 568 # For a normal setup with exim, we need something like this, which
 569 # removes the domain part
 570 #  auth_username_format = %Ln
 571 #
 572 #  or else # Exim says something like
 573 #  "LMTP error after RCPT ... 550 ... User doesn't exist someuser@somedomain"
 574 # Dovecot verbose log says something like
 575 # "auth-worker(9048): passwd(someuser@somedomain): unknown user"
 576 # reference: http://wiki.dovecot.org/LMTP/Exim
 577 #
 578 # However, I use this to direct all mail to the same inbox.
 579 # A normal way to do this, which I did at first is to have
 580 # a router in exim almost at the end, eg 950,
 581 #local_catchall:
 582 #  debug_print = "R: catchall for \$local_part@\$domain"
 583 #  driver = redirect
 584 #  domains = +local_domains
 585 #  data = $u
 586 # based on
 587 # http://blog.alteholz.eu/2015/04/exim4-and-catchall-email-address/
 588 # with superflous options removed.
 589 # However, this causes the envelope to be rewritten,
 590 # which makes filtering into mailboxes a little less robust or more complicated,
 591 # so I've done it this way instead. it also requires
 592 # modifying the local router in exim.
 593   auth_username_format = $u
 594 }
 595
 596 EOF
 597
 598
 599   cat >/etc/dovecot/local.conf <<EOF
 600 # so I can use a different login that my shell login for mail.  this is
 601 # worth doing solely for the reason that if this login is compromised,
 602 # it won't also compromise my shell password.
 603 !include conf.d/auth-passwdfile.conf.ext
 604
 605 # settings derived from wiki and 10-ssl.conf
 606 ssl = required
 607 ssl_cert = </etc/exim4/exim.crt
 608 ssl_key = </etc/exim4/exim.key
 609 # https://github.com/certbot/certbot/raw/master/certbot-apache/certbot_apache/options-ssl-apache.conf
 610 # in my cert cronjob, I check if that has changed upstream.
 611 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
 612
 613 # ian: added this, more secure, per google etc
 614 ssl_prefer_server_ciphers = yes
 615
 616
 617 mail_location = maildir:/m/%u:LAYOUT=fs:INBOX=/m/%u/INBOX
 618 mail_uid = $u
 619 mail_gid = $u
 620
 621 # for debugging info, uncomment these.
 622 # logs go to syslog and to /var/log/mail.log
 623 # auth_verbose=yes
 624 #mail_debug=yes
 625 EOF
 626   ####### end dovecot setup ########
 627
 628   # ** exim
 629
 630   # mail.iankelling.org so local imap clients can connect with tls and
 631   # when they happen to not be local.
 632   sed -ri -f - /etc/hosts <<'EOF'
 633 /^127\.0\.1\.1.* mail\.iankelling\.org\b/{p;d}
 634 /^127\.0\.1\.1 /s/ *$/ mail.iankelling.org/
 635 EOF
 636   /a/exe/cedit mail /etc/dnsmasq-servers.conf <<'EOF' || [[ $? == 1 ]]
 637 server=/mail.iankelling.org/127.0.1.1
 638 EOF
 639   if systemctl is-active dnsmasq >/dev/null; then
 640     m systemctl reload dnsmasq
 641   fi
 642
 643   # I used to use debconf-set-selections + dpkg-reconfigure,
 644   # which then updates this file
 645   # but the process is slower than updating it directly and then I want to set other things in
 646   # update-exim4.conf.conf, so there's no point.
 647   # The file is documented in man update-exim4.conf,
 648   # except the man page is not perfect, read the bash script to be sure about things.
 649
 650   # The debconf questions output is additional documentation that is not
 651   # easily accessible, but super long, along with the initial default comment in this
 652   # file, so I've saved that into ./mail-notes.conf.
 653
 654   cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 655 # note: some things we don't set that are here by default because they are unused.
 656
 657 dc_eximconfig_configtype='internet'
 658
 659 # man page: is used to build the local_domains list, together with “localhost”
 660 # iank.bid is for testing
 661 # mail.iankelling.org is for machines i own
 662 dc_other_hostnames='*.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org;*.b8.nz;b8.nz'
 663
 664 # from man page:
 665 # Is  a  list  of  domains for which we accept mail from anywhere on the Internet but which are not delivered locally, e.g.
 666 # because this machine serves as secondary MX for these domains. Sets MAIN_RELAY_TO_DOMAINS.
 667 # todo: we should not accept from anywhere, only the mx for fsf.
 668 dc_relay_domains='*.fsf.org;fsf.org'
 669 EOF
 670
 671
 672   # the debconf output about mailname is as follows:
 673   # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
 674   # name.
 675   # This name will also be used by other programs. It should be the single, fully
 676   # qualified domain name (FQDN).
 677   # Thus, if a mail address on the local host is foo@example.org, the correct value for
 678   # this option would be example.org.
 679   # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
 680
 681   echo mail.iankelling.org > /etc/mailname
 682
 683   # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
 684   # smarthost config type, not sure. all other settings
 685   # would be unused in that config type.
 686   cat >>/etc/exim4/conf.d/main/000_local <<EOF
 687 # enable 587 in addition to the default 25, so that
 688 # i can send mail where port 25 is firewalled by isp
 689 daemon_smtp_ports = 25 : 587
 690 # i don't have ipv6 setup properly yet
 691 disable_ipv6 = true
 692
 693 DKIM_CANON = relaxed
 694 DKIM_SELECTOR = li
 695
 696 # from comments in
 697 # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
 698
 699 # The file is based on the outgoing domain-name in the from-header.
 700 DKIM_DOMAIN = \${lc:\${domain:\$h_from:}}
 701 # sign if key exists
 702 DKIM_PRIVATE_KEY= \${if exists{/etc/exim4/\${dkim_domain}-private.pem} {/etc/exim4/\${dkim_domain}-private.pem}}
 703
 704
 705 # failing message on mail-tester.com:
 706 # We check if there is a server (A Record) behind your hostname kd.
 707 # You may want to publish a DNS record (A type) for the hostname kd or use a different hostname in your mail software
 708 # https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
 709 # and this one seemed appropriate from grepping config.
 710 # I originally set this to li.iankelling.org, but then ended up with errors when li tried to send
 711 # mail to kd, so this should basically be a name that no host has as their
 712 # canonical hostname since the actual host sits behind a nat and changes.
 713 # Seems logical for this to be the same as mailname.
 714 MAIN_HARDCODE_PRIMARY_HOSTNAME = mail.iankelling.org
 715
 716 # normally empty, I set this so I can set the envelope address
 717 # when doing mail redelivery to invoke filters
 718 MAIN_TRUSTED_GROUPS = $u
 719
 720 LOCAL_DELIVERY = dovecot_lmtp
 721
 722 # options exim has to avoid having to alter the default config files
 723 CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/conf.d/rcpt_local_acl
 724 CHECK_DATA_LOCAL_ACL_FILE = /etc/exim4/conf.d/data_local_acl
 725
 726 # most of the ones that gmail seems to use.
 727 # Exim has horrible default of signing unincluded
 728 # list- headers since they got mentioned in an
 729 # rfc, but this messes up mailing lists, like gnu/debian which want to
 730 # keep your dkim signature intact but add list- headers.
 731 DKIM_SIGN_HEADERS = mime-version:in-reply-to:references:from:date:subject:to
 732
 733 # recommended if dns is expected to work
 734 CHECK_RCPT_VERIFY_SENDER = true
 735 # seems like a good idea
 736 CHECK_DATA_VERIFY_HEADER_SENDER = true
 737 CHECK_RCPT_SPF = true
 738 CHECK_RCPT_REVERSE_DNS = true
 739 CHECK_MAIL_HELO_ISSUED = true
 740
 741 # testing dmarc
 742 #dmarc_tld_file = /etc/public_suffix_list.dat
 743 EOF
 744
 745   f=/etc/cron.daily/refresh-dmarc-tld-file
 746   cat >$f <<'EOF'
 747 #!/bin/bash
 748 cd /etc
 749 wget -q -N https://publicsuffix.org/list/public_suffix_list.dat
 750 EOF
 751   m chmod 755 $f
 752
 753   sed -i --follow-symlinks -f - /etc/aliases <<EOF
 754 \$a root: $postmaster
 755 /^root:/d
 756 EOF
 757
 758
 759   # https://selivan.github.io/2017/12/30/systemd-serice-always-restart.html
 760   d=/etc/systemd/system/openvpn@mail.service.d
 761   m mkdir -p $d
 762   cat >$d/override.conf <<'EOF'
 763 [Service]
 764 Restart=always
 765 # time to sleep before restarting a service
 766 RestartSec=1
 767
 768 [Unit]
 769 # StartLimitIntervalSec in recent systemd versions
 770 StartLimitInterval=0
 771 EOF
 772   if ! systemctl cat openvpn@mail.service|grep -xF StartLimitInterval=0 &>/dev/null; then
 773     # needed for the above config to go into effect
 774     m systemctl daemon-reexec
 775   fi
 776
 777
 778   m systemctl enable mailclean.timer
 779   m systemctl start mailclean.timer
 780   m systemctl restart $vpn_ser@mail
 781   m systemctl enable $vpn_ser@mail
 782   m systemctl enable dovecot
 783   m systemctl restart dovecot
 784
 785   # * not MAIL_HOST
 786 else # $HOSTNAME != $MAIL_HOST
 787   # remove mail. 2 lines to properly remove whitespace
 788   sed -ri -f - /etc/hosts <<'EOF'
 789 s#^(127\.0\.1\.1 .*) +mail\.iankelling\.org$#\1#
 790 s#^(127\.0\.1\.1 .*)mail\.iankelling\.org +(.*)#\1\2#
 791 EOF
 792
 793   echo | /a/exe/cedit mail /etc/dnsmasq-servers.conf || [[ $? == 1 ]]
 794   if systemctl is-active dnsmasq >/dev/null; then
 795     m systemctl reload dnsmasq
 796   fi
 797
 798   m systemctl disable mailclean.timer &>/dev/null ||:
 799   m systemctl stop mailclean.timer &>/dev/null ||:
 800   m systemctl disable $vpn_ser@mail
 801   m systemctl stop $vpn_ser@mail
 802   m systemctl disable dovecot ||:
 803   m systemctl stop dovecot ||:
 804   #
 805   #
 806   # would only exist because I wrote it i the previous condition,
 807   # it\'s not part of exim
 808   rm -fv /etc/exim4/conf.d/main/000_localmacros
 809   cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 810 dc_eximconfig_configtype='smarthost'
 811 dc_smarthost='$smarthost'
 812 # The manpage incorrectly states this will do header rewriting, but
 813 # that only happens if we have dc_hide_mailname is set.
 814 dc_readhost='iankelling.org'
 815 # Only used in case of bounces.
 816 dc_localdelivery='maildir_home'
 817 EOF
 818
 819   hostname -f >/etc/mailname
 820
 821   # This ends up at alerts mailbox on MAIL_HOST, but using a user that doesn't exist elsewhere
 822   # is no good.
 823   sed -i --follow-symlinks -f - /etc/aliases <<EOF
 824 \$a root: root@mail.iankelling.org
 825 /^root:/d
 826 EOF
 827
 828 fi # end $HOSTNAME != $MAIL_HOST
 829
 830 # * spool dir setup
 831
 832 # ** bind mount setup
 833 # put spool dir in directory that spans multiple distros.
 834 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
 835 #
 836 # todo: I\'m suspicious of uids for Debian-exim being the same across
 837 # distros. It would be good to test this.
 838 dir=/nocow/exim4
 839 sdir=/var/spool/exim4
 840 # we only do this if our system has $dir
 841
 842 # this used to do a symlink, but, in the boot logs, /nocow would get mounted succesfully,
 843 # about 2 seconds later, exim starts, and immediately puts into paniclog:
 844 # honVi-0000u3-82 Failed to create directory "/var/spool/exim4/input": No such file or directory
 845 # so, im trying a bind mount to get rid of that.
 846 if [[ -e /nocow ]]; then
 847   if ! grep -Fx "/nocow/exim4  /var/spool/exim4  none  bind  0 0" /etc/fstab; then
 848     echo "/nocow/exim4  /var/spool/exim4  none  bind  0 0" >>/etc/fstab
 849   fi
 850   if ! mountpoint -q $sdir; then
 851     m systemctl stop exim4
 852     if [[ -L $sdir ]]; then
 853       m rm $sdir
 854     fi
 855     if [[ ! -e $dir && -d $sdir ]]; then
 856       m mv $sdir $dir
 857     fi
 858     if [[ ! -d $sdir ]]; then
 859       m mkdir $sdir
 860       m chmod 000 $sdir # only want it to be used when its mounted
 861     fi
 862     m mount $sdir
 863   fi
 864 fi
 865
 866
 867
 868 # ** exim/spool uid setup
 869 # i have the spool directory be common to distro multi-boot, so
 870 # we need the uid to be the same. 608 cuz it's kind of in the middle
 871 # of the free system uids.
 872 IFS=:; read _ _ uid _ < <(getent passwd Debian-exim ||:) ||:; unset IFS
 873 IFS=:; read _ _ gid _ < <(getent group Debian-exim ||:) ||:; unset IFS
 874 if [[ ! $uid ]]; then
 875   # from /var/lib/dpkg/info/exim4-base.postinst, plus uid and gid options
 876   m adduser --uid 608 --system --group --quiet --home /var/spool/exim4 \
 877           --no-create-home --disabled-login --force-badname Debian-exim
 878 elif [[ $uid != 608 ]]; then
 879   m systemctl stop exim4 ||:
 880   m usermod -u 608 Debian-exim
 881   m groupmod -g 608 Debian-exim
 882   m usermod -g 608 Debian-exim
 883   m find / /nocow -xdev -uid $uid -exec chown -h 608 {} +
 884   m find / /nocow -xdev -gid $gid -exec chgrp -h 608 {} +
 885 fi
 886
 887
 888
 889
 890 # * reload exim
 891
 892 if systemctl is-active exim4 >/dev/null; then
 893   m systemctl reload exim4
 894 else
 895   m systemctl start exim4
 896 fi
 897
 898
 899 # * mail monitoring / testing
 900 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 901   f=/usr/local/bin/send-test-forward
 902   cat >$f <<'EOFOUTER'
 903 #!/bin/bash
 904 /usr/sbin/exim -t <<EOF
 905 From: ian@iankelling.org
 906 To: iank@posteo.de
 907 Subject: primary_test $(date +%s) $(date +%Y-%m-%dT%H:%M:%S%z)
 908
 909 eom
 910 EOF
 911 EOFOUTER
 912   m chmod +x $f
 913
 914   cat >/etc/cron.d/mailtest <<EOF
 915 SHELL=/bin/bash
 916 # running as user just because no need to run as root
 917 */10 * * * *   $u $f 2>&1 | /usr/local/bin/log-once send-test-forward
 918 */10 * * * *   $u /usr/local/bin/mailtest-check 2>&1 | /usr/local/bin/log-once -1 mailtest-check
 919 */10 * * * *   root chmod -R g+rw /m/md/bounces 2>&1 | /usr/local/bin/log-once -1 bounces-chmod
 920 EOF
 921   m cp /a/bin/distro-setup/filesystem/usr/local/bin/mailtest-check /usr/local/bin
 922 else
 923   rm -fv /etc/cron.d/mailtest
 924 fi
 925
 926
 927 # * Radicale
 928
 929 # MAIL_HOST also does radicale, and easier to start and stop it here
 930 # for when MAIL_HOST changes, so radicale gets the synced files and
 931 # does not stop us from remounting /o.
 932 if dpkg -s radicale &>/dev/null; then
 933   if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 934     m systemctl restart radicale
 935     m systemctl enable radicale
 936     if [[ -e /etc/logrotate.d/radicale.disabled ]]; then
 937       m mv /etc/logrotate.d/radicale{.disabled,}
 938     fi
 939   else
 940     m systemctl stop radicale
 941     m systemctl disable radicale
 942     # weekly logrotate tries to restart radicale even if it's a disabled service in flidas.
 943     if [[ -e /etc/logrotate.d/radicale ]]; then
 944       m mv /etc/logrotate.d/radicale{,.disabled}
 945     fi
 946   fi
 947 fi
 948
 949 # * misc
 950 m sudo -u $u ln -sf -T /m/.mu /home/$u/.mu
 951
 952
 953 # /etc/alias setup is debian specific, and exim postinst script sets up
 954 # an /etc/alias from root to the postmaster, based on the question
 955 # exim4-config exim4/dc_postmaster, as long as there exists an entry for
 956 # root, or there was no preexisting aliases file. postfix won\'t set up
 957 # a root to $postmaster alias if it\'s already installed. Easiest to
 958 # just set it ourselves.
 959
 960 # debconf question for postmaster:
 961 # Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
 962 # to the user account of the actual system administrator.
 963 # If this value is left empty, such mail will be saved in /var/mail/mail, which is not
 964 # recommended.
 965 # Note that postmaster\'s mail should be read on the system to which it is directed,
 966 # rather than being forwarded elsewhere, so (at least one of) the users listed here
 967 # should not redirect their mail off this machine. A 'real-' prefix can be used to
 968 # force local delivery.
 969 # Multiple user names need to be separated by spaces.
 970 # Root and postmaster mail recipient:
 971
 972
 973 exit 0
 974 :