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

   1 #!/bin/bash
   2 set -x
   3
   4 # Copyright (C) 2019 Ian Kelling
   5
   6 # Licensed under the Apache License, Version 2.0 (the "License");
   7 # you may not use this file except in compliance with the License.
   8 # You may obtain a copy of the License at
   9
  10 #     http://www.apache.org/licenses/LICENSE-2.0
  11
  12 # Unless required by applicable law or agreed to in writing, software
  13 # distributed under the License is distributed on an "AS IS" BASIS,
  14 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15 # See the License for the specific language governing permissions and
  16 # limitations under the License.
  17
  18 # todo: make quick backups of maildir, or deliver to multiple hosts.
  19
  20 set -eE -o pipefail
  21 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  22
  23 [[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
  24 if [[ ! $SUDO_USER ]]; then
  25   echo "$0: error: requires running as nonroot or sudo"
  26   exit 1
  27 fi
  28 u=$SUDO_USER
  29
  30
  31 usage() {
  32   cat <<EOF
  33 Usage: ${0##*/}
  34 Setup exim4 & dovecot & related things
  35
  36 The minimal assumption we have is that /etc/mailpass exists
  37
  38
  39 -h|--help  Print help and exit.
  40 EOF
  41   exit $1
  42 }
  43
  44
  45
  46 ####### instructions for icedove #####
  47 # Incoming mail server: mail.iankelling.org, port 143, username iank, connection security starttls, authentication method normal password
  48 # we could also just use 127.0.0.1 with no ssl, but todo: disable that in dovecot, so mail is secure from local programs.
  49 #
  50 # hamburger -> preferences -> preferences -> advanced tab -> config editor button -> security.ssl.enable_ocsp_must_staple = false
  51 # background: ovecot does not yet have ocsp stapling support
  52 # reference: https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921
  53 #
  54 # for phone, same thing but username alerts, pass in ivy-pass.
  55 #######
  56
  57
  58 ####### begin perstent password instructions ######
  59 # # exim passwords:
  60 # # for hosts which have all private files I just use the same user
  61 # # for other hosts, each one get\'s their own password.
  62 # # for generating secure pass, and storing for server too:
  63 # # user=USUALLY_SAME_AS_HOSTNAME
  64 # user=li
  65 # f=$(mktemp)
  66 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  67 # s sed -i "/^$user:/d" /p/c/filesystem/etc/exim4/passwd
  68 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
  69 # # todo: port is no longer used in mailpass, remove it.
  70 # echo "mail.iankelling.org 587 $user:$(<$f)" >> /p/c/machine_specific/$user/filesystem/etc/mailpass
  71 # # then run this script, or part of it which uses /etc/mailpass
  72
  73 # # dovecot password, i just need 1 as I\'m the only user
  74 # mkdir /p/c/filesystem/etc/dovecot
  75 # echo "iank:$(doveadm pw -s ssha256)::::::" >>/p/c/filesystem/etc/dovecot/users
  76 # conflink
  77
  78
  79
  80 # # for ad-hoc testing of some random new host sending mail:
  81 # user=li # client host username & hostname
  82 # f=$(mktemp)
  83 # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
  84 # s sed -i "/^$user:/d" /etc/exim4/passwd
  85 # echo "$user:$(mkpasswd -m sha-512 -s <$f)" | s tee -a /etc/exim4/passwd
  86 # echo "mail.iankelling.org:$user:$(<$f)" | ssh root@$user dd of=/etc/exim4/passwd.client
  87 ####### end perstent password instructions ######
  88
  89
  90 ####### begin persistent dkim/dns instructions #########
  91 # # Remove 1 level of comments in this section, set the domain var
  92 # # for the domain you are setting up, then run this and copy dns settings
  93 # # into dns.
  94 # domain=iankelling.org
  95 # c /p/c/filesystem/etc/exim4
  96 # # this has several bugs addressed in comments, but it was helpful
  97 # # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
  98
  99 # openssl genrsa -out $domain-private.pem 2048 -outform PEM
 100 # openssl rsa -in $domain-private.pem -out $domain.pem -pubout -outform PEM
 101 # # selector is needed for having multiple keys for one domain.
 102 # # I dun do that, so just use a static one: li
 103 # echo "txt record name: li._domainkey.$domain"
 104 # # Debadmin page does not have v=, fastmail does, and this
 105 # # says it\'s recommended in 3.6.1, default is DKIM1 anyways.
 106 # # https://www.ietf.org/rfc/rfc6376.txt
 107 # # Join and print all but first and last line.
 108 # # last line: swap hold & pattern, remove newlines, print.
 109 # # lines 2+: append to hold space
 110 # echo "txt record contents:"
 111 # echo "v=DKIM1; k=rsa; p=$(sed -n '${x;s/\n//gp};2,$H' $domain.pem)"
 112 # chmod 644 $domain.pem
 113 # chmod 640 $domain-private.pem
 114 # # in conflink, we chown these to group debian
 115 # conflink
 116 # # selector was also put into /etc/exim4/conf.d/main/000_localmacros,
 117 # # via the mail-setup scripts
 118
 119 # # 2017-02 dmarc policies:
 120 # # host -t txt _dmarc.gmail.com
 121 # # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
 122 # # there were articles claiming gmail would be  changing
 123 # # to p=reject, in early 2017, which didn\'t happen. I see no sources on them. It\'s
 124 # # expected to cause problems
 125 # # with a few old mailing lists, copying theirs for now.
 126 #
 127 # echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
 128
 129 # # 2017-02 spf policies:
 130 # # host -t txt lists.fedoraproject.org
 131 # # google ~all, hotmail ~all, yahoo: ?all, fastmail ?all, outlook ~all
 132 # # i include fastmail\'s settings, per their instructions,
 133 # # and follow their policy. In mail in a box, or similar instructions,
 134 # # I\'ve seen recommended to not use a restrictive policy.
 135 # echo "spf dns: name is empty, value: v=spf1 a include:spf.messagingengine.com ?all"
 136
 137 # # to check if dns has updated, you do
 138 # host -a mesmtp._domainkey.$domain
 139
 140 # # mx records,
 141 # # setting it to iankelling.org would work the same, but this
 142 # # is more flexible, I could change where mail.iankelling.org pointed.
 143 # cat <<'EOF'
 144 # mx records, 2 records each, for * and empty domain
 145 # pri 10 mail.iankelling.org
 146 # pri 20 in1-smtp.messagingengine.com
 147 # pri 30 in2-smtp.messagingengine.com
 148 # EOF
 149 ####### end  persistent dkim instructions #########
 150
 151
 152
 153 e() { printf "%s\n" "$*"; }
 154 pi() { # package install
 155   local f
 156   if dpkg -s -- "$@" &> /dev/null; then
 157     return 0;
 158   fi;
 159   while fuser /var/lib/dpkg/lock &>/dev/null; do sleep 1; done
 160   f=/var/cache/apt/pkgcache.bin;
 161   if [[ ! -r $f ]] || (( $(( $(date +%s) - $(stat -c %Y $f ) )) > 60*60*12 )); then
 162     apt-get update
 163   fi
 164   apt-get -y install --purge --auto-remove "$@"
 165 }
 166
 167 postmaster=alerts
 168 mxhost=mail.iankelling.org
 169 mxport=587
 170 forward=$u@$mxhost
 171
 172 # old setup. left as comment for example
 173 # mxhost=mail.messagingengine.com
 174 # mxport=587
 175 # forward=ian@iankelling.org
 176
 177 smarthost="$mxhost::$mxport" # exim
 178
 179 # trisquel 8 = openvpn, debian stretch = openvpn-client
 180 vpn_ser=openvpn-client
 181 if [[ ! -e /lib/systemd/system/openvpn-client@.service ]]; then
 182   vpn_ser=openvpn
 183 fi
 184
 185 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 186   # afaik, these will get ignored because they are routing to my own
 187   # machine, but rm them is safer
 188   rm -f $(eval echo ~$u)/.forward /root/.forward
 189 else
 190   # this can\'t be a symlink and has permission restrictions
 191   # it might work in /etc/aliases, but this seems more proper.
 192   install -m 644 {-o,-g}$u <(e $forward) $(eval echo ~$u)/.forward
 193 fi
 194
 195
 196 pi openvpn
 197
 198 if [[ -e /p/c/filesystem ]]; then
 199   # allow failure of these commands when our internet is down, they are likely not needed,
 200   # we check that a valid cert is there already.
 201   # to put the hostname in the known hosts
 202   if ! ssh -o StrictHostKeyChecking=no root@li.iankelling.org :; then
 203     # This just causes failure if our cert is going to expire in the next 30 days.
 204     # Certs I generate last 10 years.
 205     openssl x509 -checkend $(( 60 * 60 * 24 * 30 )) -noout -in /etc/openvpn/mail.crt
 206   else
 207     # note, man openvpn implies we could just call mail-route on vpn startup/shutdown with
 208     # systemd, buuut it can remake the tun device unexpectedly, i got this in the log
 209     # after my internet was down for a bit:
 210     # NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.
 211     /a/exe/vpn-mk-client-cert -b mail -n mail -s /b/ds/mail-route li.iankelling.org
 212   fi
 213 fi
 214
 215
 216 cat >/etc/systemd/system/mailclean.timer <<'EOF'
 217 [Unit]
 218 Description=Run mailclean daily
 219
 220 [Timer]
 221 OnCalendar=monthly
 222
 223 [Install]
 224 WantedBy=timers.target
 225 EOF
 226
 227 cat >/etc/systemd/system/mailclean.service <<EOF
 228 [Unit]
 229 Description=Delete and archive old mail files
 230 After=multi-user.target
 231
 232 [Service]
 233 User=$u
 234 Type=oneshot
 235 ExecStart=/a/bin/log-quiet/sysd-mail-once mailclean /a/bin/distro-setup/mailclean
 236 EOF
 237
 238 systemctl daemon-reload
 239
 240
 241 source /a/bin/bash_unpublished/source-state
 242 mkdir -p /etc/exim4/conf.d/{main,transport,auth,router}
 243
 244 cat >/etc/exim4/rcpt_local_acl <<'EOF'
 245 # Only hosts we control send to @mail.iankelling.org, so make sure
 246 # they are all authed.
 247 # Note, if we wanted authed senders for all domains,
 248 # we could make this condition in acl_check_mail
 249 deny
 250   message = ian trusted domain recepient but no auth
 251   !authenticated = *
 252   domains = mail.iankelling.org
 253 EOF
 254 cat >/etc/exim4/data_local_acl <<'EOF'
 255 # Except for the "condition =", this was
 256 # a comment in the check_data acl. The comment about this not
 257 # being suitable is mostly bs. The only thing related I found was to
 258 # add the condition =, cuz spamassassin has problems with big
 259 # messages and spammers don't bother with big messages,
 260 # but I've increased the size from 10k
 261 # suggested in official docs, and 100k in the wiki example because
 262 # those docs are rather old and I see a 110k spam message
 263 # pretty quickly looking through my spam folder.
 264 warn
 265   condition = ${if < {$message_size}{2000K}}
 266   spam = Debian-exim:true
 267   add_header = X-Spam_score: $spam_score\n\
 268             X-Spam_score_int: $spam_score_int\n\
 269             X-Spam_bar: $spam_bar\n\
 270             X-Spam_report: $spam_report
 271
 272 #accept
 273 #  spf = pass:fail:softfail:none:neutral:permerror:temperror
 274 #  dmarc_status = reject:quarantine
 275 #  add_header = Reply-to: dmarctest@iankelling.org
 276
 277 EOF
 278 cat >/etc/exim4/conf.d/auth/29_exim4-config_auth <<'EOF'
 279 # from 30_exim4-config_examples
 280
 281 plain_server:
 282 driver = plaintext
 283 public_name = PLAIN
 284 server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
 285 server_set_id = $auth2
 286 server_prompts = :
 287 .ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
 288 server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
 289 .endif
 290 EOF
 291
 292 cat >/etc/exim4/conf.d/router/900_exim4-config_local_user <<'EOF'
 293 ### router/900_exim4-config_local_user
 294 #################################
 295
 296 # This router matches local user mailboxes. If the router fails, the error
 297 # message is "Unknown user".
 298
 299 local_user:
 300   debug_print = "R: local_user for $local_part@$domain"
 301   driver = accept
 302   domains = +local_domains
 303 # ian: commented this, in conjunction with a dovecot lmtp
 304 # change so I get mail for all users.
 305 #  check_local_user
 306   local_parts = ! root
 307   transport = LOCAL_DELIVERY
 308   cannot_route_message = Unknown user
 309 EOF
 310 cat >/etc/exim4/conf.d/transport/30_exim4-config_dovecot_lmtp <<'EOF'
 311 dovecot_lmtp:
 312         driver = lmtp
 313         socket = /var/run/dovecot/lmtp
 314         #maximum number of deliveries per batch, default 1
 315         batch_max = 200
 316 EOF
 317
 318 cat >/etc/exim4/host_local_deny_exceptions <<'EOF'
 319 mail.fsf.org
 320 *.posteo.de
 321 EOF
 322
 323 cat >/etc/exim4/conf.d/router/190_exim4-config_fsfsmarthost <<'EOF'
 324 # smarthost for fsf mail
 325 # ian: copied from /etc/exim4/conf.d/router/200_exim4-config_primary, and added senders = and
 326 # replaced DCsmarthost with mail.fsf.org
 327 fsfsmarthost:
 328   debug_print = "R: smarthost for $local_part@$domain"
 329   driver = manualroute
 330   domains = ! +local_domains
 331   senders = *@fsf.org
 332   transport = remote_smtp_smarthost
 333   route_list = * mail.fsf.org byname
 334   host_find_failed = ignore
 335   same_domain_copy_routing = yes
 336   no_more
 337 EOF
 338
 339
 340 #### begin mail cert setup ###
 341 f=/usr/local/bin/mail-cert-cron
 342 cat >$f <<'EOF'
 343 set -eE -o pipefail
 344 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 345
 346 [[ $EUID == 0 ]] || exec sudo "$BASH_SOURCE" "$@"
 347
 348 f=/a/bin/bash_unpublished/source-state
 349 if [[ -e $f ]]; then
 350     source $f
 351 fi
 352 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 353     local_mx=mail.iankelling.org
 354     rsync_common="rsync -ogtL --chown=root:Debian-exim --chmod=640 root@li.iankelling.org:/etc/letsencrypt/live/$local_mx/"
 355     ${rsync_common}fullchain.pem /etc/exim4/exim.crt
 356     ret=$?
 357     ${rsync_common}privkey.pem /etc/exim4/exim.key
 358     new_ret=$?
 359     if [[ $ret != $new_ret ]]; then
 360        echo "$0: error: differing rsync returns, $ret, $new_ret"
 361        exit 1
 362     fi
 363 fi
 364 if [[ $new_ret != 0 ]]; then
 365     if ! openssl x509 -checkend $(( 60 * 60 * 24 * 3 )) -noout -in /etc/exim4/exim.crt; then
 366         echo "$0: error!: cert rsync failed and it will expire in less than 3 days"
 367         exit 1
 368     fi
 369 fi
 370 exit 0
 371 EOF
 372 chmod 755 $f
 373
 374 cat >/etc/systemd/system/mailcert.service <<'EOF'
 375 [Unit]
 376 Description=Mail cert rsync
 377 After=multi-user.target
 378
 379 [Service]
 380 Type=oneshot
 381 ExecStart=/a/bin/log-quiet/sysd-mail-once mailcert /usr/local/bin/mail-cert-cron
 382 EOF
 383
 384 cat >/etc/systemd/system/mailcert.timer <<'EOF'
 385 [Unit]
 386 Description=Run mail-cert once a day
 387
 388 [Timer]
 389 OnCalendar=daily
 390
 391 [Install]
 392 WantedBy=timers.target
 393 EOF
 394 systemctl daemon-reload
 395 systemctl start mailcert
 396 systemctl restart mailcert.timer
 397 systemctl enable mailcert.timer
 398
 399 ##### end mailcert setup #####
 400
 401 # comon stuff
 402 cat >/etc/exim4/update-exim4.conf.conf  <<'EOF'
 403 # default stuff, i havent checked if its needed
 404 dc_minimaldns='false'
 405 dc_relay_nets=''
 406 CFILEMODE='644'
 407 dc_use_split_config='true'
 408 dc_local_interfaces=''
 409 dc_mailname_in_oh='true'
 410 EOF
 411
 412
 413 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 414
 415   # mail.iankelling.org so local imap clients can connect with tls and
 416   # when they happen to not be local.
 417   sed -ri -f - /etc/hosts <<'EOF'
 418 /^127\.0\.1\.1.* mail\.iankelling\.org\b/{p;d}
 419 /^127\.0\.1\.1 /s/ *$/ mail.iankelling.org/
 420 EOF
 421   /a/exe/cedit mail /etc/dnsmasq-servers.conf <<'EOF' || [[ $? == 1 ]]
 422 server=/mail.iankelling.org/127.0.1.1
 423 EOF
 424   systemctl reload dnsmasq
 425
 426   # I used to use debconf-set-selections + dpkg-reconfigure,
 427   # which then updates this file
 428   # but the process is slower than updating it directly and then I want to set other things in
 429   # update-exim4.conf.conf, so there's no point.
 430   # The file is documented in man update-exim4.conf,
 431   # except the man page is not perfect, read the bash script to be sure about things.
 432
 433   # The debconf questions output is additional documentation that is not
 434   # easily accessible, but super long, along with the initial default comment in this
 435   # file, so I've saved that into ./mail-notes.conf.
 436
 437   cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 438 # note: some things we don't set that are here by default because they are unused.
 439
 440 dc_eximconfig_configtype='internet'
 441
 442 # man page: is used to build the local_domains list, together with “localhost”
 443 # iank.bid is for testing
 444 # mail.iankelling.org is for machines i own
 445 dc_other_hostnames='*.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org;*.b8.nz;b8.nz'
 446
 447 # from man page:
 448 # Is  a  list  of  domains for which we accept mail from anywhere on the Internet but which are not delivered locally, e.g.
 449 # because this machine serves as secondary MX for these domains. Sets MAIN_RELAY_TO_DOMAINS.
 450 # todo: we should not accept from anywhere, only the mx for fsf.
 451 dc_relay_domains='*.fsf.org;fsf.org'
 452 EOF
 453
 454
 455   # the debconf output about mailname is as follows:
 456   # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
 457   # name.
 458   # This name will also be used by other programs. It should be the single, fully
 459   # qualified domain name (FQDN).
 460   # Thus, if a mail address on the local host is foo@example.org, the correct value for
 461   # this option would be example.org.
 462   # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
 463
 464   echo mail.iankelling.org > /etc/mailname
 465
 466   # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
 467   # smarthost config type, not sure. all other settings
 468   # would be unused in that config type.
 469   rm -f /etc/exim4/conf.d/main/000_localmacros # old filename
 470   cat >/etc/exim4/conf.d/main/000_local <<EOF
 471 # enable 587 in addition to the default 25, so that
 472 # i can send mail where port 25 is firewalled by isp
 473 daemon_smtp_ports = 25 : 587
 474 # i don't have ipv6 setup for my vpn tunnel yet.
 475 disable_ipv6 = true
 476
 477 MAIN_TLS_ENABLE = true
 478
 479 DKIM_CANON = relaxed
 480 DKIM_SELECTOR = li
 481
 482 # from comments in
 483 # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
 484
 485 # The file is based on the outgoing domain-name in the from-header.
 486 DKIM_DOMAIN = \${lc:\${domain:\$h_from:}}
 487 # sign if key exists
 488 DKIM_PRIVATE_KEY= \${if exists{/etc/exim4/\${dkim_domain}-private.pem} {/etc/exim4/\${dkim_domain}-private.pem}}
 489
 490
 491 # failing message on mail-tester.com:
 492 # We check if there is a server (A Record) behind your hostname kd.
 493 # You may want to publish a DNS record (A type) for the hostname kd or use a different hostname in your mail software
 494 # https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
 495 # and this one seemed appropriate from grepping config.
 496 # I originally set this to li.iankelling.org, but then ended up with errors when li tried to send
 497 # mail to kd, so this should basically be a name that no host has as their
 498 # canonical hostname since the actual host sits behind a nat and changes.
 499 # Seems logical for this to be the same as mailname.
 500 MAIN_HARDCODE_PRIMARY_HOSTNAME = mail.iankelling.org
 501
 502 # normally empty, I set this so I can set the envelope address
 503 # when doing mail redelivery to invoke filters
 504 MAIN_TRUSTED_GROUPS = $u
 505
 506 LOCAL_DELIVERY = dovecot_lmtp
 507
 508 # options exim has to avoid having to alter the default config files
 509 CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/rcpt_local_acl
 510 CHECK_DATA_LOCAL_ACL_FILE = /etc/exim4/data_local_acl
 511
 512 # debian exim config added this in 2016 or so?
 513 # it's part of the smtp spec, to limit lines to 998 chars
 514 # but a fair amount of legit mail does not adhere to it. I don't think
 515 # this should be default, like it says in
 516 # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828801
 517 # todo: the bug for introducing this was about headers, but
 518 # the fix maybe is for all lines? one says gmail rejects, the
 519 # other says gmail does not reject. figure out and open a new bug.
 520 IGNORE_SMTP_LINE_LENGTH_LIMIT = true
 521
 522 # most of the ones that gmail seems to use.
 523 # Exim has horrible default of signing unincluded
 524 # list- headers since they got mentioned in an
 525 # rfc, but this messes up mailing lists, like gnu/debian which want to
 526 # keep your dkim signature intact but add list- headers.
 527 DKIM_SIGN_HEADERS = mime-version:in-reply-to:references:from:date:subject:to
 528
 529 # recommended if dns is expected to work
 530 CHECK_RCPT_VERIFY_SENDER = true
 531 # seems like a good idea
 532 CHECK_DATA_VERIFY_HEADER_SENDER = true
 533 CHECK_RCPT_SPF = true
 534 CHECK_RCPT_REVERSE_DNS = true
 535 CHECK_MAIL_HELO_ISSUED = true
 536
 537 MAIN_LOG_SELECTOR = +all
 538
 539 # testing dmarc
 540 #dmarc_tld_file = /etc/public_suffix_list.dat
 541 EOF
 542
 543   f=/etc/cron.daily/refresh-dmarc-tld-file
 544   cat >$f <<'EOF'
 545 #!/bin/bash
 546 cd /etc
 547 wget -q -N https://publicsuffix.org/list/public_suffix_list.dat
 548 EOF
 549   chmod 755 $f
 550
 551   sed -i --follow-symlinks -f - /etc/aliases <<EOF
 552 \$a root: $postmaster
 553 /^root:/d
 554 EOF
 555
 556   ####### begin dovecot setup ########
 557   # based on a little google and package search, just the dovecot
 558   # packages we need instead of dovecot-common.
 559   #
 560   # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
 561   # directly.  The reason to do this is to use dovecot\'s sieve, which
 562   # has extensions that allow it to be almost equivalent to exim\'s
 563   # filter capabilities, some ways probably better, some worse, and
 564   # sieve has the benefit of being supported in postfix and
 565   # proprietary/weird environments, so there is more examples on the
 566   # internet. I was torn about whether to do this or not, meh.
 567   pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
 568
 569   for f in /p/c/subdir_files/sieve/*sieve /a/c/subdir_files/sieve/*sieve; do
 570     sudo -u $u /a/exe/lnf -T $f $(eval echo ~$u)/sieve/${f##*/}
 571   done
 572   # if we changed 90-sieve.conf and removed the active part of the
 573   # sieve option, we wouldn\'t need this, but I\'d rather not modify a
 574   # default config if not needed. This won\'t work as a symlink in /a/c
 575   # unfortunately.
 576   sudo -u $u /a/exe/lnf -T sieve/main.sieve $(eval echo ~$u)/.dovecot.sieve
 577
 578   # we set this later in local.conf
 579   sed -ri -f - /etc/dovecot/conf.d/10-mail.conf <<'EOF'
 580 /^\s*mail_location\s*=/d
 581 EOF
 582
 583   cat >/etc/dovecot/conf.d/20-lmtp.conf <<EOF
 584 protocol lmtp {
 585 #per https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
 586   mail_plugins = \$mail_plugins sieve
 587 # default was
 588   #mail_plugins = \$mail_plugins
 589
 590 # For a normal setup with exim, we need something like this, which
 591 # removes the domain part
 592 #  auth_username_format = %Ln
 593 #
 594 #  or else # Exim says something like
 595 #  "LMTP error after RCPT ... 550 ... User doesn't exist someuser@somedomain"
 596 # Dovecot verbose log says something like
 597 # "auth-worker(9048): passwd(someuser@somedomain): unknown user"
 598 # reference: http://wiki.dovecot.org/LMTP/Exim
 599 #
 600 # However, I use this to direct all mail to the same inbox.
 601 # A normal way to do this, which I did at first is to have
 602 # a router in exim almost at the end, eg 950,
 603 #local_catchall:
 604 #  debug_print = "R: catchall for \$local_part@\$domain"
 605 #  driver = redirect
 606 #  domains = +local_domains
 607 #  data = $u
 608 # based on
 609 # http://blog.alteholz.eu/2015/04/exim4-and-catchall-email-address/
 610 # with superflous options removed.
 611 # However, this causes the envelope to be rewritten,
 612 # which makes filtering into mailboxes a little less robust or more complicated,
 613 # so I've done it this way instead. it also requires
 614 # modifying the local router in exim.
 615   auth_username_format = $u
 616 }
 617
 618 EOF
 619
 620
 621   cat >/etc/dovecot/local.conf <<EOF
 622 # so I can use a different login that my shell login for mail.  this is
 623 # worth doing solely for the reason that if this login is compromised,
 624 # it won't also compromise my shell password.
 625 !include conf.d/auth-passwdfile.conf.ext
 626
 627 # settings derived from wiki and 10-ssl.conf
 628 ssl = required
 629 ssl_cert = </etc/exim4/exim.crt
 630 ssl_key = </etc/exim4/exim.key
 631 # https://github.com/certbot/certbot/raw/master/certbot-apache/certbot_apache/options-ssl-apache.conf
 632 # in my cert cronjob, I check if that has changed upstream.
 633 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
 634
 635 # ian: added this, more secure, per google etc
 636 ssl_prefer_server_ciphers = yes
 637
 638
 639 mail_location = maildir:/m/%u:LAYOUT=fs:INBOX=/m/%u/INBOX
 640 mail_uid = $u
 641 mail_gid = $u
 642
 643 # for debugging info, uncomment these.
 644 # logs go to syslog and to /var/log/mail.log
 645 # auth_verbose=yes
 646 #mail_debug=yes
 647 EOF
 648   ####### end dovecot setup ########
 649
 650   # https://selivan.github.io/2017/12/30/systemd-serice-always-restart.html
 651   d=/etc/systemd/system/openvpn@mail
 652   mkdir -p $d
 653   cat >$d/override.conf <<'EOF'
 654 [Service]
 655 Restart=always
 656 # time to sleep before restarting a service
 657 RestartSec=1
 658
 659 [Unit]
 660 # StartLimitIntervalSec in recent systemd versions
 661 StartLimitInterval=0
 662 EOF
 663
 664
 665
 666   systemctl enable mailclean.timer
 667   systemctl start mailclean.timer
 668   systemctl restart $vpn_ser@mail
 669   systemctl enable $vpn_ser@mail
 670   systemctl enable dovecot
 671   systemctl restart dovecot
 672
 673 else # $HOSTNAME != $MAIL_HOST
 674   # remove mail. 2 lines to properly remove whitespace
 675   sed -ri -f - /etc/hosts <<'EOF'
 676 s#^(127\.0\.1\.1 .*) +mail\.iankelling\.org$#\1#
 677 s#^(127\.0\.1\.1 .*)mail\.iankelling\.org +(.*)#\1\2#
 678 EOF
 679
 680   echo | /a/exe/cedit mail /etc/dnsmasq-servers.conf || [[ $? == 1 ]]
 681   systemctl reload dnsmasq
 682
 683   systemctl disable mailclean.timer &>/dev/null ||:
 684   systemctl stop mailclean.timer &>/dev/null ||:
 685   systemctl disable $vpn_ser@mail
 686   systemctl stop $vpn_ser@mail
 687   systemctl disable dovecot ||:
 688   systemctl stop dovecot ||:
 689   #
 690   #
 691   # would only exist because I wrote it i the previous condition,
 692   # it\'s not part of exim
 693   rm -f /etc/exim4/conf.d/main/000_localmacros
 694   cat >>/etc/exim4/update-exim4.conf.conf <<EOF
 695 dc_eximconfig_configtype='satellite'
 696 dc_smarthost='$smarthost'
 697 # The manpage incorrectly states this will do header rewriting, but
 698 # that only happens if we have dc_hide_mailname is set.
 699 dc_readhost='iankelling.org'
 700 # Only used in case of bounces.
 701 dc_localdelivery='maildir_home'
 702 EOF
 703
 704   hostname -f > /etc/mailname
 705
 706   # We set this to alerts on MAIL_HOST, but using a user that doesn't exist elsewhere
 707   # is no good.
 708   sed -i --follow-symlinks -f - /etc/aliases <<EOF
 709 \$a root:
 710 /^root:/d
 711 EOF
 712
 713 fi # end $HOSTNAME != $MAIL_HOST
 714
 715 systemctl reload exim4
 716
 717 # i have the spool directory be common to distro multi-boot, so
 718 # we need the uid to be the same. 608 cuz it's kind of in the middle
 719 # of the free system uids.
 720 IFS=:; read _ _ uid _ < <(getent passwd Debian-exim ||:) ||:; unset IFS
 721 IFS=:; read _ _ gid _ < <(getent group Debian-exim ||:) ||:; unset IFS
 722 if [[ ! $uid ]]; then
 723   # from /var/lib/dpkg/info/exim4-base.postinst, plus uid and gid options
 724   adduser --uid 608 --system --group --quiet --home /var/spool/exim4 \
 725           --no-create-home --disabled-login --force-badname Debian-exim
 726 elif [[ $uid != 608 ]]; then
 727   systemctl stop exim4 ||:
 728   usermod -u 608 Debian-exim
 729   groupmod -g 608 Debian-exim
 730   usermod -g 608 Debian-exim
 731   find / /nocow -xdev -uid $uid -exec chown -h 608 {} +
 732   find / /nocow -xdev -gid $gid -exec chgrp -h 608 {} +
 733 fi
 734
 735
 736 # light version of exim does not have sasl auth support.
 737 pi exim4-daemon-heavy spamassassin spf-tools-perl
 738
 739
 740
 741 ##### begin spamassassin config
 742 systemctl enable spamassassin
 743 # per readme.debian
 744 sed -i '/^\s*CRON\s*=/d' /etc/default/spamassassin
 745 e CRON=1 >>/etc/default/spamassassin
 746 # just noticed this in the config file, seems like a good idea.
 747 sed -i '/^\s*NICE\s*=/d' /etc/default/spamassassin
 748 e 'NICE="--nicelevel 15"' >>/etc/default/spamassassin
 749 systemctl start spamassassin
 750 systemctl reload spamassassin
 751
 752 cat >/etc/systemd/system/spamddnsfix.service <<'EOF'
 753 [Unit]
 754 Description=spamd dns bug fix cronjob
 755
 756 [Service]
 757 Type=oneshot
 758 ExecStart=/a/bin/distro-setup/spamd-dns-fix
 759 EOF
 760 # 2017-09, debian closed the bug on this saying upstream had fixed it.
 761 # remove this when i\'m using the newer package, ie, debian 10, or maybe
 762 # ubuntu 18.04.
 763 cat >/etc/systemd/system/spamddnsfix.timer <<'EOF'
 764 [Unit]
 765 Description=run spamd bug fix script every 10 minutes
 766
 767 [Timer]
 768 OnActiveSec=60
 769 # the script looks back 9 minutes into the journal,
 770 # it takes a second to run,
 771 # so lets run every 9 minutes and 10 seconds.
 772 OnUnitActiveSec=550
 773
 774 [Install]
 775 WantedBy=timers.target
 776 EOF
 777 systemctl daemon-reload
 778 systemctl restart spamddnsfix.timer
 779 systemctl enable spamddnsfix.timer
 780 #
 781 #####   end spamassassin config
 782
 783
 784
 785
 786
 787 # https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
 788 # i only need .forwards, so just doing that one.
 789 cd /etc/exim4/conf.d/router
 790 b=userforward_higher_priority
 791 # replace the router name so it is unique
 792 sed -r s/^\\S+:/$b:/ 600_exim4-config_userforward >175_$b
 793
 794 # begin setup passwd.client
 795 f=/etc/exim4/passwd.client
 796 rm -f /etc/exim4/passwd.client
 797 install -m 640 -g Debian-exim /dev/null $f
 798 while read -r domain _ pass; do
 799   # reference: exim4_passwd_client(5)
 800   printf "%s:%s\n" "$domain" "$pass" >>$f
 801 done </etc/mailpass
 802 # end setup passwd.client
 803
 804 # by default, only 10 days of logs are kept. increase that.
 805 sed -ri 's/^(\s*rotate\s).*/\11000/' /etc/logrotate.d/exim4-base
 806
 807 systemctl restart exim4
 808
 809
 810
 811 # /etc/alias setup is debian specific, and exim postinst script sets up
 812 # an /etc/alias from root to the postmaster, based on the question
 813 # exim4-config exim4/dc_postmaster, as long as there exists an entry for
 814 # root, or there was no preexisting aliases file. postfix won\'t set up
 815 # a root to $postmaster alias if it\'s already installed. Easiest to
 816 # just set it ourselves.
 817
 818 # debconf question for postmaster:
 819 # Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
 820 # to the user account of the actual system administrator.
 821 # If this value is left empty, such mail will be saved in /var/mail/mail, which is not
 822 # recommended.
 823 # Note that postmaster\'s mail should be read on the system to which it is directed,
 824 # rather than being forwarded elsewhere, so (at least one of) the users listed here
 825 # should not redirect their mail off this machine. A 'real-' prefix can be used to
 826 # force local delivery.
 827 # Multiple user names need to be separated by spaces.
 828 # Root and postmaster mail recipient:
 829
 830 # local mail that bounces goes to /Maildir or /root/Maildir
 831 dirs=(/m/md/bounces/{cur,tmp,new})
 832 mkdir -p ${dirs[@]}
 833 chown -R $u:Debian-exim /m/md/bounces
 834 chmod 775 ${dirs[@]}
 835 usermod -a -G Debian-exim $u
 836 for d in /Maildir /root/Maildir; do
 837   if [[ ! -L $d ]]; then
 838     rm -rf $d
 839   fi
 840   ln -sf -T /m/md/bounces $d
 841 done
 842
 843 sudo -u $u ln -sf -T /m/.mu /home/$u/.mu
 844
 845 # put spool dir in directory that spans multiple distros.
 846 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
 847 #
 848 # todo: I\'m suspicious of uids for Debian-exim being the same across
 849 # distros. It would be good to test this.
 850 dir=/nocow/exim4
 851 sdir=/var/spool/exim4
 852 # we only do this if our system has $dir
 853
 854 # this used to do a symlink, but, in the boot logs, /nocow would get mounted succesfully,
 855 # about 2 seconds later, exim starts, and immediately puts into paniclog:
 856 # honVi-0000u3-82 Failed to create directory "/var/spool/exim4/input": No such file or directory
 857 # so, im trying a bind mount to get rid of that.
 858 if [[ -e /nocow ]]; then
 859   if ! grep -Fx "/nocow/exim4  /var/spool/exim4  none  bind  0 0" /etc/fstab; then
 860     echo "/nocow/exim4  /var/spool/exim4  none  bind  0 0" >> /etc/fstab
 861   fi
 862   if ! mountpoint -q $sdir; then
 863     systemctl stop exim4
 864     if [[ -L $sdir ]]; then
 865       rm $sdir
 866     fi
 867     if [[ ! -e $dir && -d $sdir ]]; then
 868       mv $sdir $dir
 869     fi
 870     if [[ ! -d $sdir ]]; then
 871       mkdir $sdir
 872       chmod 000 $sdir # only want it to be used when its mounted
 873     fi
 874     mount $sdir
 875   fi
 876 fi
 877
 878
 879
 880 systemctl restart exim4
 881 systemctl enable exim4
 882
 883
 884 if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 885   f=/usr/local/bin/send-test-forward
 886   cat >$f <<'EOF'
 887 #!/bin/bash
 888 echo body_test | mail -s "primary_test $(date +%s) $(date +%Y-%m-%dT%H:%M:%S%z)" iank@posteo.de
 889 EOF
 890   chmod +x $f
 891
 892   cat >/etc/cron.d/mailtest <<EOF
 893 SHELL=/bin/bash
 894 # running as user just because no need to run as root
 895 */10 * * * *   $u $f 2>&1 | /usr/local/bin/log-once send-test-forward
 896 */10 * * * *   $u /usr/local/bin/mailtest-check 2>&1 | /usr/local/bin/log-once -1 send-test-forward
 897 */10 * * * *   root chmod -R g+rw /m/md/bounces 2>&1 | /usr/local/bin/log-once -1 bounces-chmod
 898 EOF
 899   cp /a/bin/distro-setup/filesystem/usr/local/bin/mailtest-check /usr/local/bin
 900 else
 901   rm -f /etc/cron.d/mailtest
 902 fi
 903
 904 # MAIL_HOST also does radicale, and easier to start and stop it here
 905 # for when MAIL_HOST changes, so radicale gets the synced files and
 906 # does not stop us from remounting /o.
 907 if dpkg -s radicale &>/dev/null; then
 908   if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
 909     systemctl restart radicale
 910     systemctl enable radicale
 911     if [[ -e /etc/logrotate.d/radicale.disabled ]]; then
 912       mv /etc/logrotate.d/radicale{.disabled,}
 913     fi
 914   else
 915     systemctl stop radicale
 916     systemctl disable radicale
 917     # weekly logrotate tries to restart radicale even if it's a disabled service in flidas.
 918     if [[ -e /etc/logrotate.d/radicale ]]; then
 919       mv /etc/logrotate.d/radicale{,.disabled}
 920     fi
 921   fi
 922 fi
 923 exit 0
 924 :