X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=mail-setup;h=645510a14049d1c0ff8d61e313a1843b75426ed3;hb=6561b24248188e5bce423acab25c2c14c7e5ce6d;hp=b43bde401ff2d1227741475b02a4cf2bea82e041;hpb=c2bf18a9e27233fc9b57450455969fc9e53508b8;p=distro-setup

diff --git a/mail-setup b/mail-setup
index b43bde4..645510a 100755
--- a/mail-setup
+++ b/mail-setup
@@ -1,5 +1,7 @@
-#!/bin/bash -l
-# Copyright (C) 2016 Ian Kelling
+#!/bin/bash
+set -x
+
+# Copyright (C) 2019 Ian Kelling
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -13,183 +15,373 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# todo: make quick backups of maildir, or deliver to multiple hosts.
 
-# misc exim notes:
-# useful exim docs:
-# /usr/share/doc/exim4-base/README.Debian.gz
-# /usr/share/doc/exim4-base/spec.txt.gz
+set -eE -o pipefail
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 
-# routers, transports, and authenticators are sections, and you define
-# driver instances in those sections, and the manual calls them driver
-# types but there is also a more specific "type" of driver, which is specified
-# with the driver = some_module setting in the driver.
+[[ $EUID == 0 ]] || exec sudo -E "$BASH_SOURCE" "$@"
+if [[ ! $SUDO_USER ]]; then
+  echo "$0: error: requires running as nonroot or sudo"
+  exit 1
+fi
+u=$SUDO_USER
 
-# the driver option must precede and private options (options that are
-# specific to that driver), so follow example of putting it at beginning.
 
-# The full list of option settings for any particular driver instance,
-# including all the defaulted values, can be extracted by making use of
-# the -bP command line option.
+usage() {
+  cat <<EOF
+Usage: ${0##*/}
+Setup exim4 & dovecot & related things
 
-# exim clear out message queue. as root:
-# adapted from somewhere on stackoverflow.
-# ser stop exim4; sleep 1; exim -bp | exiqgrep -i | xargs exim -Mrm; ser start exim4
+The minimal assumption we have is that /etc/mailpass exists
 
-# fastmail has changed their smtp server, but the old one still works,
-# I see no reason to bother changing.
-# New one is smtp.fastmail.com
 
-# test delivery & rewrite settings:
-#exim4 -bt ian@localhost
+-h|--help  Print help and exit.
+EOF
+  exit $1
+}
+
+
+
+####### instructions for icedove #####
+# Incoming mail server: mail.iankelling.org, port 143, username iank, connection security starttls, authentication method normal password
+# we could also just use 127.0.0.1 with no ssl, but todo: disable that in dovecot, so mail is secure from local programs.
+#
+# hamburger -> preferences -> preferences -> advanced tab -> config editor button -> security.ssl.enable_ocsp_must_staple = false
+# background: ovecot does not yet have ocsp stapling support
+# reference: https://community.letsencrypt.org/t/simple-guide-using-lets-encrypt-ssl-certs-with-dovecot/2921
+#
+# for phone, same thing but username alerts, pass in ivy-pass.
+#######
+
+
+####### begin perstent password instructions ######
+# # exim passwords:
+# # for hosts which have all private files I just use the same user
+# # for other hosts, each one get\'s their own password.
+# # for generating secure pass, and storing for server too:
+# # user=USUALLY_SAME_AS_HOSTNAME
+# user=li
+# f=$(mktemp)
+# apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
+# s sed -i "/^$user:/d" /p/c/filesystem/etc/exim4/passwd
+# echo "$user:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
+# # todo: port is no longer used in mailpass, remove it.
+# echo "mail.iankelling.org 587 $user:$(<$f)" >> /p/c/machine_specific/$user/filesystem/etc/mailpass
+# # then run this script, or part of it which uses /etc/mailpass
+
+# # dovecot password, i just need 1 as I\'m the only user
+# mkdir /p/c/filesystem/etc/dovecot
+# echo "iank:$(doveadm pw -s ssha256)::::::" >>/p/c/filesystem/etc/dovecot/users
+# conflink
+
+
+
+# # for ad-hoc testing of some random new host sending mail:
+# user=li # client host username & hostname
+# f=$(mktemp)
+# apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
+# s sed -i "/^$user:/d" /etc/exim4/passwd
+# echo "$user:$(mkpasswd -m sha-512 -s <$f)" | s tee -a /etc/exim4/passwd
+# echo "mail.iankelling.org:$user:$(<$f)" | ssh root@$user dd of=/etc/exim4/passwd.client
+####### end perstent password instructions ######
+
+
+####### begin persistent dkim/dns instructions #########
+# # Remove 1 level of comments in this section, set the domain var
+# # for the domain you are setting up, then run this and copy dns settings
+# # into dns.
+# domain=iankelling.org
+# c /p/c/filesystem/etc/exim4
+# # this has several bugs addressed in comments, but it was helpful
+# # https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
+
+# openssl genrsa -out $domain-private.pem 2048 -outform PEM
+# openssl rsa -in $domain-private.pem -out $domain.pem -pubout -outform PEM
+# # selector is needed for having multiple keys for one domain.
+# # I dun do that, so just use a static one: li
+# echo "txt record name: li._domainkey.$domain"
+# # Debadmin page does not have v=, fastmail does, and this
+# # says it\'s recommended in 3.6.1, default is DKIM1 anyways.
+# # https://www.ietf.org/rfc/rfc6376.txt
+# # Join and print all but first and last line.
+# # last line: swap hold & pattern, remove newlines, print.
+# # lines 2+: append to hold space
+# echo "txt record contents:"
+# echo "v=DKIM1; k=rsa; p=$(sed -n '${x;s/\n//gp};2,$H' $domain.pem)"
+# chmod 644 $domain.pem
+# chmod 640 $domain-private.pem
+# # in conflink, we chown these to group debian
+# conflink
+# # selector was also put into /etc/exim4/conf.d/main/000_localmacros,
+# # via the mail-setup scripts
+
+# # 2017-02 dmarc policies:
+# # host -t txt _dmarc.gmail.com
+# # yahoo: p=reject, hotmail: p=none, gmail: p=none, fastmail none for legacy reasons
+# # there were articles claiming gmail would be  changing
+# # to p=reject, in early 2017, which didn\'t happen. I see no sources on them. It\'s
+# # expected to cause problems
+# # with a few old mailing lists, copying theirs for now.
+#
+# echo "dmarc dns, name: _dmarc value: v=DMARC1; p=none; rua=mailto:mailauth-reports@$domain"
+
+# # 2017-02 spf policies:
+# # host -t txt lists.fedoraproject.org
+# # google ~all, hotmail ~all, yahoo: ?all, fastmail ?all, outlook ~all
+# # i include fastmail\'s settings, per their instructions,
+# # and follow their policy. In mail in a box, or similar instructions,
+# # I\'ve seen recommended to not use a restrictive policy.
+# echo "spf dns: name is empty, value: v=spf1 a include:spf.messagingengine.com ?all"
+
+# # to check if dns has updated, you do
+# host -a mesmtp._domainkey.$domain
+
+# # mx records,
+# # setting it to iankelling.org would work the same, but this
+# # is more flexible, I could change where mail.iankelling.org pointed.
+# cat <<'EOF'
+# mx records, 2 records each, for * and empty domain
+# pri 10 mail.iankelling.org
+# pri 20 in1-smtp.messagingengine.com
+# pri 30 in2-smtp.messagingengine.com
+# EOF
+####### end  persistent dkim instructions #########
+
+
+
+e() { printf "%s\n" "$*"; }
+pi() { # package install
+  local f
+  if dpkg -s -- "$@" &> /dev/null; then
+    return 0;
+  fi;
+  while fuser /var/lib/dpkg/lock &>/dev/null; do sleep 1; done
+  f=/var/cache/apt/pkgcache.bin;
+  if [[ ! -r $f ]] || (( $(( $(date +%s) - $(stat -c %Y $f ) )) > 60*60*12 )); then
+    apt-get update
+  fi
+  apt-get -y install --purge --auto-remove "$@"
+}
+
+postmaster=alerts
+mxhost=mail.iankelling.org
+mxport=587
+forward=$u@$mxhost
+
+# old setup. left as comment for example
+# mxhost=mail.messagingengine.com
+# mxport=587
+# forward=ian@iankelling.org
+
+smarthost="$mxhost::$mxport" # exim
+
+# trisquel 8 = openvpn, debian stretch = openvpn-client
+vpn_ser=openvpn-client
+if [[ ! -e /lib/systemd/system/openvpn-client@.service ]]; then
+  vpn_ser=openvpn
+fi
 
+if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+  # afaik, these will get ignored because they are routing to my own
+  # machine, but rm them is safer
+  rm -f $(eval echo ~$u)/.forward /root/.forward
+else
+  # this can\'t be a symlink and has permission restrictions
+  # it might work in /etc/aliases, but this seems more proper.
+  install -m 644 {-o,-g}$u <(e $forward) $(eval echo ~$u)/.forward
+fi
 
-set -eE -o pipefail
-trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
 
-type=$1
-postfix() { [[ $type == postfix ]]; }
-exim() { [[ $type == exim4 ]]; }
-if ! exim && ! postfix; then
-    echo "$1: error: expected exim4 or postfix as first arg"
-    exit 1
+pi openvpn
+
+if [[ -e /p/c/filesystem ]]; then
+  # allow failure of these commands when our internet is down, they are likely not needed,
+  # we check that a valid cert is there already.
+  # to put the hostname in the known hosts
+  if ! ssh -o StrictHostKeyChecking=no root@li.iankelling.org :; then
+    # This just causes failure if our cert is going to expire in the next 30 days.
+    # Certs I generate last 10 years.
+    openssl x509 -checkend $(( 60 * 60 * 24 * 30 )) -noout -in /etc/openvpn/mail.crt
+  else
+    # note, man openvpn implies we could just call mail-route on vpn startup/shutdown with
+    # systemd, buuut it can remake the tun device unexpectedly, i got this in the log
+    # after my internet was down for a bit:
+    # NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.
+    /a/exe/vpn-mk-client-cert -b mail -n mail -s /b/ds/mail-route li.iankelling.org
+  fi
 fi
 
 
-local_mx=mail.iankelling.org
-if [[ $HOSTNAME == $MAIL_HOST ]]; then
-    host=mail.messagingengine.com
-    relayhost="[$host]:587" # postfix
-    smarthost="$host::587" # exim
-else
-    host=$local_mx
-    relayhost="[$host]:25" # postfix
-    smarthost="$host::25" # exim
-fi
+cat >/etc/systemd/system/mailclean.timer <<'EOF'
+[Unit]
+Description=Run mailclean daily
+
+[Timer]
+OnCalendar=monthly
 
-forward=ian@$local_mx
-
-
-# background: This also works instead of ~/.forward
-# s sed -i --follow-symlinks '/^root/d' /etc/aliases ||:
-#echo "root: $HOSTNAME@$SOME_DOMAIN" | s tee -a /etc/aliases
-# this can't be a symlink and has permission restrictions
-# it might work in /etc/aliases, but this seems more proper.
-e $forward > ~/.forward
-e $forward | s tee /root/.forward
-# exim log complains about 664 permissions.
-s chmod 644 ~/.forward /root/.forward
-
-
-# offlineimap uses this too, it is much easier to use one location than to
-# condition it's config and postfix's config
-case $distro in
-    fedora) s lnf -T ca-certificates.crt /etc/ssl/ca-bundle.trust.crt ;;
-    *) :
-esac
-
-if postfix; then
-    # dunno why, but debian installed postfix with builddep emacs
-    # but I will just explicitly install it here since
-    # I use it for sending mail in emacs.
-    if isdeb; then
-        s debconf-set-selections <<EOF
-postfix postfix/main_mailer_type select Satellite system
-postfix postfix/mailname string $HOSTNAME
-postfix postfix/relayhost string $relayhost
+[Install]
+WantedBy=timers.target
+EOF
+
+cat >/etc/systemd/system/mailclean.service <<EOF
+[Unit]
+Description=Delete and archive old mail files
+After=multi-user.target
+
+[Service]
+User=$u
+Type=oneshot
+ExecStart=/a/bin/log-quiet/sysd-mail-once mailclean /a/bin/distro-setup/mailclean
 EOF
 
-        pi postfix
-    else
-        pi postfix
-        # Settings from reading the output when installing on debian,
-        # then seeing which were different in a default install on arch.
-        # I assume the same works for fedora.
-        postconfin <<EOF
-mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
-mailbox_size_limit = 0
-relayhost = $relayhost
-inet_interfaces = loopback-only
+systemctl daemon-reload
+
+
+source /a/bin/bash_unpublished/source-state
+mkdir -p /etc/exim4/conf.d/{main,transport,auth,router}
+
+cat >/etc/exim4/rcpt_local_acl <<'EOF'
+# Only hosts we control send to @mail.iankelling.org, so make sure
+# they are all authed.
+# Note, if we wanted authed senders for all domains,
+# we could make this condition in acl_check_mail
+deny
+  message = ian trusted domain recepient but no auth
+  !authenticated = *
+  domains = mail.iankelling.org
 EOF
+cat >/etc/exim4/data_local_acl <<'EOF'
+# Except for the "condition =", this was
+# a comment in the check_data acl. The comment about this not
+# being suitable is mostly bs. The only thing related I found was to
+# add the condition =, cuz spamassassin has problems with big
+# messages and spammers don't bother with big messages,
+# but I've increased the size from 10k
+# suggested in official docs, and 100k in the wiki example because
+# those docs are rather old and I see a 110k spam message
+# pretty quickly looking through my spam folder.
+warn
+  condition = ${if < {$message_size}{2000K}}
+  spam = Debian-exim:true
+  add_header = X-Spam_score: $spam_score\n\
+            X-Spam_score_int: $spam_score_int\n\
+            X-Spam_bar: $spam_bar\n\
+            X-Spam_report: $spam_report
+
+#accept
+#  spf = pass:fail:softfail:none:neutral:permerror:temperror
+#  dmarc_status = reject:quarantine
+#  add_header = Reply-to: dmarctest@iankelling.org
 
-        s systemctl enable postfix
-        s systemctl start postfix
-    fi
-    # i'm assuming mail just won't work on systems without the sasl_passwd.
-    postconfin <<'EOF'
-smtp_sasl_auth_enable = yes
-smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
-smtp_sasl_security_options = noanonymous
-smtp_tls_security_level = secure
-message_size_limit =  20480000
-smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
-inet_protocols = ipv4
 EOF
-    # msg_size_limit: I ran into a log file not sending cuz of size. double from 10 to 20 meg limit
-    # inet_protocols: without this, postfix tries an ipv6 lookup then gives
-    # up and fails. snippet from syslog: type=AAAA: Host not found, try again
-
-
-    f=/etc/postfix/sasl_passwd
-    s rm -f $f
-    s touch $f
-    s chmod 600 $f
-    s cat /etc/mailpass| while read -r domain port pass; do
-        # format: domain port user:pass
-        # mailpass is just a name i made up, since postfix and
-        # exim both use a slightly crazy format to translate to
-        # each other, it\'s easier to use my own format.
-        printf "[%s]:%s %s" "$domain" "$port" "${pass/@/#}" | s tee -a $f >/dev/null
-    done
-    s postmap hash:/etc/postfix/sasl_passwd
-    s service postfix reload
-
-else # exim. has debian specific stuff for now
-    # debconf settings will not work if packages are already installed,
-    # such as on vps images.
-    pu exim4-daemon-light exim4-daemon-heavy exim4-config exim4-base exim4
-
-    # wording of question from dpkg-reconfigure exim4-config
-    # 1. internet site; mail is sent and received directly using SMTP
-    # 2. mail sent by smarthost; received via SMTP or fetchmail
-    # 3. mail sent by smarthost; no local mail
-    # 4. local delivery only; not on a network
-    # 5. no configuration at this time
-    #
-    # only the one receiving host needs option 2, the rest can do option
-    # 1, but that host might change, so we pick option 2 and later don't
-    # set it up to receive anything, because it has nothing in it's
-    # receiving password file and we make that mandatory. Also, only
-    # receiving host needs dc_other_hostnames and beyond, but no harm.
-
-    # note, another related setting is /etc/mailname, which
-    # is set to be $HOSTNAME.lan on stretch. this may need to be
-    # setup on other distros.
-
-    # setting local_interfaces to empty listens on all interfaces.
-    # default is 127.0.0.1 ; ::1, so only listen to lo interface.
-    s debconf-set-selections <<EOF
-exim4-config exim4/dc_eximconfig_configtype select mail sent by smarthost; received via SMTP or fetchmail
-exim4-config exim4/dc_smarthost string $smarthost
-exim4-config exim4/use_split_config boolean true
-exim4-config exim4/dc_other_hostnames string mail.iankelling.org
-exim4-config exim4/dc_local_interfaces	string
-exim4-config exim4/dc_postmaster string ian
-exim4-config exim4/dc_localdelivery select Maildir format in home directory
+cat >/etc/exim4/conf.d/auth/29_exim4-config_auth <<'EOF'
+# from 30_exim4-config_examples
+
+plain_server:
+driver = plaintext
+public_name = PLAIN
+server_condition = "${if crypteq{$auth3}{${extract{1}{:}{${lookup{$auth2}lsearch{CONFDIR/passwd}{$value}{*:*}}}}}{1}{0}}"
+server_set_id = $auth2
+server_prompts = :
+.ifndef AUTH_SERVER_ALLOW_NOTLS_PASSWORDS
+server_advertise_condition = ${if eq{$tls_in_cipher}{}{}{*}}
+.endif
+EOF
+
+cat >/etc/exim4/conf.d/router/900_exim4-config_local_user <<'EOF'
+### router/900_exim4-config_local_user
+#################################
+
+# This router matches local user mailboxes. If the router fails, the error
+# message is "Unknown user".
+
+local_user:
+  debug_print = "R: local_user for $local_part@$domain"
+  driver = accept
+  domains = +local_domains
+# ian: commented this, in conjunction with a dovecot lmtp
+# change so I get mail for all users.
+#  check_local_user
+  local_parts = ! root
+  transport = LOCAL_DELIVERY
+  cannot_route_message = Unknown user
+EOF
+cat >/etc/exim4/conf.d/transport/30_exim4-config_dovecot_lmtp <<'EOF'
+dovecot_lmtp:
+        driver = lmtp
+        socket = /var/run/dovecot/lmtp
+        #maximum number of deliveries per batch, default 1
+        batch_max = 200
+EOF
+
+cat >/etc/exim4/host_local_deny_exceptions <<'EOF'
+mail.fsf.org
+*.posteo.de
 EOF
-    # light version does not have sasl auth support.
-    pi exim4-daemon-heavy
 
-    s dd of=/etc/systemd/system/mailcert.service <<'EOF'
+cat >/etc/exim4/conf.d/router/190_exim4-config_fsfsmarthost <<'EOF'
+# smarthost for fsf mail
+# ian: copied from /etc/exim4/conf.d/router/200_exim4-config_primary, and added senders = and
+# replaced DCsmarthost with mail.fsf.org
+fsfsmarthost:
+  debug_print = "R: smarthost for $local_part@$domain"
+  driver = manualroute
+  domains = ! +local_domains
+  senders = *@fsf.org
+  transport = remote_smtp_smarthost
+  route_list = * mail.fsf.org byname
+  host_find_failed = ignore
+  same_domain_copy_routing = yes
+  no_more
+EOF
+
+
+#### begin mail cert setup ###
+f=/usr/local/bin/mail-cert-cron
+cat >$f <<'EOF'
+set -eE -o pipefail
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
+
+[[ $EUID == 0 ]] || exec sudo "$BASH_SOURCE" "$@"
+
+f=/a/bin/bash_unpublished/source-state
+if [[ -e $f ]]; then
+    source $f
+fi
+if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+    local_mx=mail.iankelling.org
+    rsync_common="rsync -ogtL --chown=root:Debian-exim --chmod=640 root@li.iankelling.org:/etc/letsencrypt/live/$local_mx/"
+    ${rsync_common}fullchain.pem /etc/exim4/exim.crt
+    ret=$?
+    ${rsync_common}privkey.pem /etc/exim4/exim.key
+    new_ret=$?
+    if [[ $ret != $new_ret ]]; then
+       echo "$0: error: differing rsync returns, $ret, $new_ret"
+       exit 1
+    fi
+fi
+if [[ $new_ret != 0 ]]; then
+    if ! openssl x509 -checkend $(( 60 * 60 * 24 * 3 )) -noout -in /etc/exim4/exim.crt; then
+        echo "$0: error!: cert rsync failed and it will expire in less than 3 days"
+        exit 1
+    fi
+fi
+exit 0
+EOF
+chmod 755 $f
+
+cat >/etc/systemd/system/mailcert.service <<'EOF'
 [Unit]
 Description=Mail cert rsync
 After=multi-user.target
 
 [Service]
 Type=oneshot
-ExecStart=/a/bin/log-quiet/sysd-mail-once mailcert /a/bin/distro-setup/mail-cert-cron
+ExecStart=/a/bin/log-quiet/sysd-mail-once mailcert /usr/local/bin/mail-cert-cron
 EOF
 
-    s dd of=/etc/systemd/system/mailcert.timer <<'EOF'
+cat >/etc/systemd/system/mailcert.timer <<'EOF'
 [Unit]
 Description=Run mail-cert once a day
 
@@ -199,71 +391,529 @@ OnCalendar=daily
 [Install]
 WantedBy=timers.target
 EOF
-    ser start mailcert
-    sgo mailcert.timer
-
-    f=/etc/exim4/passwd.client
-    s rm -f $f
-    s touch $f
-    s chmod 640 $f
-    s chown root:Debian-exim $f
-    # generating secure pass, and storing for server too:
-    # user=USUALLY_SAME_AS_HOSTNAME
-    # f=$(mktemp)
-    # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
-    # echo "$user:$(mkpasswd -m sha-512 -s <$f)" >>/p/c/filesystem/etc/exim4/passwd
-    # echo "mail.iankelling.org:$user:$(<$f)" >> /p/c/machine_specific/$user/filesystem/etc/mailpass
-    #
-    # for ad-hoc testing of some random new host:
-    # host=testhost # client host username & hostname
-    # f=$(mktemp)
-    # apg -m 50 -x 70 -n 1 -a 1 -M CLN >$f
-    # s sed "/^host:/d" /etc/exim4/passwd
-    # echo "$host:$(mkpasswd -m sha-512 -s <$f)" | s tee -a /etc/exim4/passwd
-    # echo "mail.iankelling.org:$host:$(<$f)" | ssh root@$host dd of=/etc/exim4/passwd.client
-    s cat /etc/mailpass| while read -r domain port pass; do
-        # reference: exim4_passwd_client(5)
-        printf "%s:%s" "$domain" "$pass" | s tee -a $f >/dev/null
-    done
-
-    # https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
-    # i only need .forwards, so just doing that one.
-    cd /etc/exim4/conf.d/router
-    a=userforward
-    b=${a}_higher_priority
-    tmp=$(mktemp)
-    of=175_$b
-    # sed to make the router name unique
-    sed -r s/^\\S+:/$b:/ 600_exim4-config_$a | s dd of=$tmp 2>/dev/null
-    if ! diff -q $tmp $of &>/dev/null; then
-        s dd if=$tmp of=$of >/dev/null
-        ser restart exim4
-    fi
+systemctl daemon-reload
+systemctl start mailcert
+systemctl restart mailcert.timer
+systemctl enable mailcert.timer
+
+##### end mailcert setup #####
+
+# comon stuff
+cat >/etc/exim4/update-exim4.conf.conf  <<'EOF'
+# default stuff, i havent checked if its needed
+dc_minimaldns='false'
+dc_relay_nets=''
+CFILEMODE='644'
+dc_use_split_config='true'
+dc_local_interfaces=''
+dc_mailname_in_oh='true'
+EOF
+
+
+if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+
+  # mail.iankelling.org so local imap clients can connect with tls and
+  # when they happen to not be local.
+  sed -ri -f - /etc/hosts <<'EOF'
+/^127\.0\.1\.1.* mail\.iankelling\.org\b/{p;d}
+/^127\.0\.1\.1 /s/ *$/ mail.iankelling.org/
+EOF
+  /a/exe/cedit mail /etc/dnsmasq-servers.conf <<'EOF' || [[ $? == 1 ]]
+server=/mail.iankelling.org/127.0.1.1
+EOF
+  systemctl reload dnsmasq
+
+  # I used to use debconf-set-selections + dpkg-reconfigure,
+  # which then updates this file
+  # but the process is slower than updating it directly and then I want to set other things in
+  # update-exim4.conf.conf, so there's no point.
+  # The file is documented in man update-exim4.conf,
+  # except the man page is not perfect, read the bash script to be sure about things.
+
+  # The debconf questions output is additional documentation that is not
+  # easily accessible, but super long, along with the initial default comment in this
+  # file, so I've saved that into ./mail-notes.conf.
+
+  cat >>/etc/exim4/update-exim4.conf.conf <<EOF
+# note: some things we don't set that are here by default because they are unused.
+
+dc_eximconfig_configtype='internet'
+
+# man page: is used to build the local_domains list, together with “localhost”
+# iank.bid is for testing
+# mail.iankelling.org is for machines i own
+dc_other_hostnames='*.iankelling.org;iankelling.org;*iank.bid;iank.bid;*zroe.org;zroe.org;*.b8.nz;b8.nz'
+
+# from man page:
+# Is  a  list  of  domains for which we accept mail from anywhere on the Internet but which are not delivered locally, e.g.
+# because this machine serves as secondary MX for these domains. Sets MAIN_RELAY_TO_DOMAINS.
+# todo: we should not accept from anywhere, only the mx for fsf.
+dc_relay_domains='*.fsf.org;fsf.org'
+EOF
+
+
+  # the debconf output about mailname is as follows:
+  # The 'mail name' is the domain name used to 'qualify' mail addresses without a domain
+  # name.
+  # This name will also be used by other programs. It should be the single, fully
+  # qualified domain name (FQDN).
+  # Thus, if a mail address on the local host is foo@example.org, the correct value for
+  # this option would be example.org.
+  # This name won\'t appear on From: lines of outgoing messages if rewriting is enabled.
+
+  echo mail.iankelling.org > /etc/mailname
+
+  # MAIN_HARDCODE_PRIMARY_HOSTNAME might mess up the
+  # smarthost config type, not sure. all other settings
+  # would be unused in that config type.
+  rm -f /etc/exim4/conf.d/main/000_localmacros # old filename
+  cat >/etc/exim4/conf.d/main/000_local <<EOF
+# enable 587 in addition to the default 25, so that
+# i can send mail where port 25 is firewalled by isp
+daemon_smtp_ports = 25 : 587
+# i don't have ipv6 setup for my vpn tunnel yet.
+disable_ipv6 = true
+
+MAIN_TLS_ENABLE = true
+
+DKIM_CANON = relaxed
+DKIM_SELECTOR = li
+
+# from comments in
+# https://debian-administration.org/article/718/DKIM-signing_outgoing_mail_with_exim4
+
+# The file is based on the outgoing domain-name in the from-header.
+DKIM_DOMAIN = \${lc:\${domain:\$h_from:}}
+# sign if key exists
+DKIM_PRIVATE_KEY= \${if exists{/etc/exim4/\${dkim_domain}-private.pem} {/etc/exim4/\${dkim_domain}-private.pem}}
+
+
+# failing message on mail-tester.com:
+# We check if there is a server (A Record) behind your hostname kd.
+# You may want to publish a DNS record (A type) for the hostname kd or use a different hostname in your mail software
+# https://serverfault.com/questions/46545/how-do-i-change-exim4s-primary-hostname-on-a-debian-box
+# and this one seemed appropriate from grepping config.
+# I originally set this to li.iankelling.org, but then ended up with errors when li tried to send
+# mail to kd, so this should basically be a name that no host has as their
+# canonical hostname since the actual host sits behind a nat and changes.
+# Seems logical for this to be the same as mailname.
+MAIN_HARDCODE_PRIMARY_HOSTNAME = mail.iankelling.org
+
+# normally empty, I set this so I can set the envelope address
+# when doing mail redelivery to invoke filters
+MAIN_TRUSTED_GROUPS = $u
+
+LOCAL_DELIVERY = dovecot_lmtp
+
+# options exim has to avoid having to alter the default config files
+CHECK_RCPT_LOCAL_ACL_FILE = /etc/exim4/rcpt_local_acl
+CHECK_DATA_LOCAL_ACL_FILE = /etc/exim4/data_local_acl
+
+# debian exim config added this in 2016 or so?
+# it's part of the smtp spec, to limit lines to 998 chars
+# but a fair amount of legit mail does not adhere to it. I don't think
+# this should be default, like it says in
+# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=828801
+# todo: the bug for introducing this was about headers, but
+# the fix maybe is for all lines? one says gmail rejects, the
+# other says gmail does not reject. figure out and open a new bug.
+IGNORE_SMTP_LINE_LENGTH_LIMIT = true
+
+# most of the ones that gmail seems to use.
+# Exim has horrible default of signing unincluded
+# list- headers since they got mentioned in an
+# rfc, but this messes up mailing lists, like gnu/debian which want to
+# keep your dkim signature intact but add list- headers.
+DKIM_SIGN_HEADERS = mime-version:in-reply-to:references:from:date:subject:to
+
+# recommended if dns is expected to work
+CHECK_RCPT_VERIFY_SENDER = true
+# seems like a good idea
+CHECK_DATA_VERIFY_HEADER_SENDER = true
+CHECK_RCPT_SPF = true
+CHECK_RCPT_REVERSE_DNS = true
+CHECK_MAIL_HELO_ISSUED = true
+
+MAIN_LOG_SELECTOR = +all
+
+# testing dmarc
+#dmarc_tld_file = /etc/public_suffix_list.dat
+EOF
+
+  f=/etc/cron.daily/refresh-dmarc-tld-file
+  cat >$f <<'EOF'
+#!/bin/bash
+cd /etc
+wget -nv -N https://publicsuffix.org/list/public_suffix_list.dat
+EOF
+  chmod 755 $f
+
+  sed -i --follow-symlinks -f - /etc/aliases <<EOF
+\$a root: $postmaster
+/^root:/d
+EOF
+
+  ####### begin dovecot setup ########
+  # based on a little google and package search, just the dovecot
+  # packages we need instead of dovecot-common.
+  #
+  # dovecot-lmtpd is for exim to deliver to dovecot instead of maildir
+  # directly.  The reason to do this is to use dovecot\'s sieve, which
+  # has extensions that allow it to be almost equivalent to exim\'s
+  # filter capabilities, some ways probably better, some worse, and
+  # sieve has the benefit of being supported in postfix and
+  # proprietary/weird environments, so there is more examples on the
+  # internet. I was torn about whether to do this or not, meh.
+  pi dovecot-core dovecot-imapd dovecot-sieve dovecot-lmtpd
+
+  # if we changed 90-sieve.conf and removed the active part of the
+  # sieve option, we wouldn\'t need this, but I\'d rather not modify a
+  # default config if not needed. This won\'t work as a symlink in /a/c
+  # unfortunately.
+  sudo -u $u /a/exe/lnf -T sieve/main.sieve $(eval echo ~$u)/.dovecot.sieve
+
+  # we set this later in local.conf
+  sed -ri -f - /etc/dovecot/conf.d/10-mail.conf <<'EOF'
+/^\s*mail_location\s*=/d
+EOF
+
+  cat >/etc/dovecot/conf.d/20-lmtp.conf <<EOF
+protocol lmtp {
+#per https://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
+  mail_plugins = \$mail_plugins sieve
+# default was
+  #mail_plugins = \$mail_plugins
+
+# For a normal setup with exim, we need something like this, which
+# removes the domain part
+#  auth_username_format = %Ln
+#
+#  or else # Exim says something like
+#  "LMTP error after RCPT ... 550 ... User doesn't exist someuser@somedomain"
+# Dovecot verbose log says something like
+# "auth-worker(9048): passwd(someuser@somedomain): unknown user"
+# reference: http://wiki.dovecot.org/LMTP/Exim
+#
+# However, I use this to direct all mail to the same inbox.
+# A normal way to do this, which I did at first is to have
+# a router in exim almost at the end, eg 950,
+#local_catchall:
+#  debug_print = "R: catchall for \$local_part@\$domain"
+#  driver = redirect
+#  domains = +local_domains
+#  data = $u
+# based on
+# http://blog.alteholz.eu/2015/04/exim4-and-catchall-email-address/
+# with superflous options removed.
+# However, this causes the envelope to be rewritten,
+# which makes filtering into mailboxes a little less robust or more complicated,
+# so I've done it this way instead. it also requires
+# modifying the local router in exim.
+  auth_username_format = $u
+}
+
+EOF
+
+
+  cat >/etc/dovecot/local.conf <<EOF
+# so I can use a different login that my shell login for mail.  this is
+# worth doing solely for the reason that if this login is compromised,
+# it won't also compromise my shell password.
+!include conf.d/auth-passwdfile.conf.ext
+
+# settings derived from wiki and 10-ssl.conf
+ssl = required
+ssl_cert = </etc/exim4/exim.crt
+ssl_key = </etc/exim4/exim.key
+# https://github.com/certbot/certbot/raw/master/certbot-apache/certbot_apache/options-ssl-apache.conf
+# in my cert cronjob, I check if that has changed upstream.
+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
+
+# ian: added this, more secure, per google etc
+ssl_prefer_server_ciphers = yes
+
+
+mail_location = maildir:/m/%u:LAYOUT=fs:INBOX=/m/%u/INBOX
+mail_uid = $u
+mail_gid = $u
+
+# for debugging info, uncomment these.
+# logs go to syslog and to /var/log/mail.log
+# auth_verbose=yes
+#mail_debug=yes
+EOF
+  ####### end dovecot setup ########
+
+  # https://selivan.github.io/2017/12/30/systemd-serice-always-restart.html
+  d=/etc/systemd/system/openvpn@mail
+  mkdir -p $d
+  cat >$d/override.conf <<'EOF'
+[Service]
+Restart=always
+# time to sleep before restarting a service
+RestartSec=1
+
+[Unit]
+# StartLimitIntervalSec in recent systemd versions
+StartLimitInterval=0
+EOF
+
+
+
+  systemctl enable mailclean.timer
+  systemctl start mailclean.timer
+  systemctl restart $vpn_ser@mail
+  systemctl enable $vpn_ser@mail
+  systemctl enable dovecot
+  systemctl restart dovecot
+
+else # $HOSTNAME != $MAIL_HOST
+  # remove mail. 2 lines to properly remove whitespace
+  sed -ri -f - /etc/hosts <<'EOF'
+s#^(127\.0\.1\.1 .*) +mail\.iankelling\.org$#\1#
+s#^(127\.0\.1\.1 .*)mail\.iankelling\.org +(.*)#\1\2#
+EOF
+
+  echo | /a/exe/cedit mail /etc/dnsmasq-servers.conf || [[ $? == 1 ]]
+  systemctl reload dnsmasq
+
+  systemctl disable mailclean.timer &>/dev/null ||:
+  systemctl stop mailclean.timer &>/dev/null ||:
+  systemctl disable $vpn_ser@mail
+  systemctl stop $vpn_ser@mail
+  systemctl disable dovecot ||:
+  systemctl stop dovecot ||:
+  #
+  #
+  # would only exist because I wrote it i the previous condition,
+  # it\'s not part of exim
+  rm -f /etc/exim4/conf.d/main/000_localmacros
+  cat >>/etc/exim4/update-exim4.conf.conf <<EOF
+dc_eximconfig_configtype='satellite'
+dc_smarthost='$smarthost'
+# The manpage incorrectly states this will do header rewriting, but
+# that only happens if we have dc_hide_mailname is set.
+dc_readhost='iankelling.org'
+# Only used in case of bounces.
+dc_localdelivery='maildir_home'
+EOF
+
+  hostname -f > /etc/mailname
+
+  # We set this to alerts on MAIL_HOST, but using a user that doesn't exist elsewhere
+  # is no good.
+  sed -i --follow-symlinks -f - /etc/aliases <<EOF
+\$a root:
+/^root:/d
+EOF
+
+fi # end $HOSTNAME != $MAIL_HOST
+
+systemctl reload exim4
+
+# i have the spool directory be common to distro multi-boot, so
+# we need the uid to be the same. 608 cuz it's kind of in the middle
+# of the free system uids.
+IFS=:; read _ _ uid _ < <(getent passwd Debian-exim ||:) ||:; unset IFS
+IFS=:; read _ _ gid _ < <(getent group Debian-exim ||:) ||:; unset IFS
+if [[ ! $uid ]]; then
+  # from /var/lib/dpkg/info/exim4-base.postinst, plus uid and gid options
+  adduser --uid 608 --system --group --quiet --home /var/spool/exim4 \
+	  --no-create-home --disabled-login --force-badname Debian-exim
+elif [[ $uid != 608 ]]; then
+  systemctl stop exim4 ||:
+  usermod -u 608 Debian-exim
+  groupmod -g 608 Debian-exim
+  usermod -g 608 Debian-exim
+  find / /nocow -xdev -uid $uid -exec chown -h 608 {} +
+  find / /nocow -xdev -gid $gid -exec chgrp -h 608 {} +
 fi
 
 
+# light version of exim does not have sasl auth support.
+pi exim4-daemon-heavy spamassassin spf-tools-perl
+
+
+
+##### begin spamassassin config
+systemctl enable spamassassin
+# per readme.debian
+sed -i '/^\s*CRON\s*=/d' /etc/default/spamassassin
+e CRON=1 >>/etc/default/spamassassin
+# just noticed this in the config file, seems like a good idea.
+sed -i '/^\s*NICE\s*=/d' /etc/default/spamassassin
+e 'NICE="--nicelevel 15"' >>/etc/default/spamassassin
+systemctl start spamassassin
+systemctl reload spamassassin
 
-# linode image has a root alias. completely useless, remove it.
-sudo sed -i '/^root:/d' /etc/aliases
+cat >/etc/systemd/system/spamddnsfix.service <<'EOF'
+[Unit]
+Description=spamd dns bug fix cronjob
 
-s newaliases
+[Service]
+Type=oneshot
+ExecStart=/a/bin/distro-setup/spamd-dns-fix
+EOF
+# 2017-09, debian closed the bug on this saying upstream had fixed it.
+# remove this when i\'m using the newer package, ie, debian 10, or maybe
+# ubuntu 18.04.
+cat >/etc/systemd/system/spamddnsfix.timer <<'EOF'
+[Unit]
+Description=run spamd bug fix script every 10 minutes
 
+[Timer]
+OnActiveSec=60
+# the script looks back 9 minutes into the journal,
+# it takes a second to run,
+# so lets run every 9 minutes and 10 seconds.
+OnUnitActiveSec=550
 
+[Install]
+WantedBy=timers.target
+EOF
+systemctl daemon-reload
+systemctl restart spamddnsfix.timer
+systemctl enable spamddnsfix.timer
+#
+#####   end spamassassin config
+
+
+
+
+
+# https://blog.dhampir.no/content/make-exim4-on-debian-respect-forward-and-etcaliases-when-using-a-smarthost
+# i only need .forwards, so just doing that one.
+cd /etc/exim4/conf.d/router
+b=userforward_higher_priority
+# replace the router name so it is unique
+sed -r s/^\\S+:/$b:/ 600_exim4-config_userforward >175_$b
+
+# begin setup passwd.client
+f=/etc/exim4/passwd.client
+rm -f /etc/exim4/passwd.client
+install -m 640 -g Debian-exim /dev/null $f
+while read -r domain _ pass; do
+  # reference: exim4_passwd_client(5)
+  printf "%s:%s\n" "$domain" "$pass" >>$f
+done </etc/mailpass
+# end setup passwd.client
+
+# by default, only 10 days of logs are kept. increase that.
+sed -ri 's/^(\s*rotate\s).*/\11000/' /etc/logrotate.d/exim4-base
+
+systemctl restart exim4
+
+
+
+# /etc/alias setup is debian specific, and exim postinst script sets up
+# an /etc/alias from root to the postmaster, based on the question
+# exim4-config exim4/dc_postmaster, as long as there exists an entry for
+# root, or there was no preexisting aliases file. postfix won\'t set up
+# a root to $postmaster alias if it\'s already installed. Easiest to
+# just set it ourselves.
+
+# debconf question for postmaster:
+# Mail for the 'postmaster', 'root', and other system accounts needs to be redirected
+# to the user account of the actual system administrator.
+# If this value is left empty, such mail will be saved in /var/mail/mail, which is not
+# recommended.
+# Note that postmaster\'s mail should be read on the system to which it is directed,
+# rather than being forwarded elsewhere, so (at least one of) the users listed here
+# should not redirect their mail off this machine. A 'real-' prefix can be used to
+# force local delivery.
+# Multiple user names need to be separated by spaces.
+# Root and postmaster mail recipient:
+
+# local mail that bounces goes to /Maildir or /root/Maildir
+dirs=(/m/md/bounces/{cur,tmp,new})
+mkdir -p ${dirs[@]}
+chown -R $u:Debian-exim /m/md/bounces
+chmod 775 ${dirs[@]}
+usermod -a -G Debian-exim $u
+for d in /Maildir /root/Maildir; do
+  if [[ ! -L $d ]]; then
+    rm -rf $d
+  fi
+  ln -sf -T /m/md/bounces $d
+done
+
+# put spool dir in directory that spans multiple distros.
 # based on http://www.postfix.org/qmgr.8.html and my notes in gnus
-dir=/nocow/$type
-sdir=/var/spool/$type
-if [[ $(readlink -f $sdir) != $dir ]]; then
-    ser stop $type
+#
+# todo: I\'m suspicious of uids for Debian-exim being the same across
+# distros. It would be good to test this.
+dir=/nocow/exim4
+sdir=/var/spool/exim4
+# we only do this if our system has $dir
+
+# this used to do a symlink, but, in the boot logs, /nocow would get mounted succesfully,
+# about 2 seconds later, exim starts, and immediately puts into paniclog:
+# honVi-0000u3-82 Failed to create directory "/var/spool/exim4/input": No such file or directory
+# so, im trying a bind mount to get rid of that.
+if [[ -e /nocow ]]; then
+  if ! grep -Fx "/nocow/exim4  /var/spool/exim4  none  bind  0 0" /etc/fstab; then
+    echo "/nocow/exim4  /var/spool/exim4  none  bind  0 0" >> /etc/fstab
+  fi
+  if ! mountpoint -q $sdir; then
+    systemctl stop exim4
+    if [[ -L $sdir ]]; then
+      rm $sdir
+    fi
     if [[ ! -e $dir && -d $sdir ]]; then
-        s mv $sdir $dir
+      mv $sdir $dir
+    fi
+    if [[ ! -d $sdir ]]; then
+      mkdir $sdir
+      chmod 000 $sdir # only want it to be used when its mounted
     fi
-    s lnf -T $dir $sdir
+    mount $sdir
+  fi
 fi
 
-sgo $type
 
 
-# if I wanted the from address to be renamed and sent to a different address,
-# echo "sdx@localhost development@localhost" | sudo dd of=/etc/postfix/recipient_canonical
-# sudo postmap hash:/etc/postfix/recipient_canonical
-# sudo service postfix reload
+systemctl restart exim4
+systemctl enable exim4
+
+
+if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+  f=/usr/local/bin/send-test-forward
+  cat >$f <<'EOF'
+#!/bin/bash
+echo body_test | mail -s "primary_test $(date +%s) $(date +%Y-%m-%dT%H:%M:%S%z)" iank@posteo.de
+EOF
+  chmod +x $f
+
+  cat >/etc/cron.d/mailtest <<EOF
+SHELL=/bin/bash
+# running as user just because no need to run as root
+*/10 * * * *   $u $f
+*/10 * * * *   $u /usr/local/bin/mailtest-check
+*/10 * * * *   root chmod -R g+rw /m/md/bounces
+EOF
+  cp /a/bin/distro-setup/filesystem/usr/local/bin/mailtest-check /usr/local/bin
+else
+  rm -f /etc/cron.d/mailtest
+fi
+
+# MAIL_HOST also does radicale, and easier to start and stop it here
+# for when MAIL_HOST changes, so radicale gets the synced files and
+# does not stop us from remounting /o.
+if dpkg -s radicale &>/dev/null; then
+  if [[ $HOSTNAME == "$MAIL_HOST" ]]; then
+    systemctl restart radicale
+    systemctl enable radicale
+    if [[ -e /etc/logrotate.d/radicale.disabled ]]; then
+      mv /etc/logrotate.d/radicale{.disabled,}
+    fi
+  else
+    systemctl stop radicale
+    systemctl disable radicale
+    # weekly logrotate tries to restart radicale even if it's a disabled service in flidas.
+    if [[ -e /etc/logrotate.d/radicale ]]; then
+      mv /etc/logrotate.d/radicale{,.disabled}
+    fi
+  fi
+fi
+exit 0
+: