# Copyright (C) 2019 Ian Kelling
# SPDX-License-Identifier: AGPL-3.0-or-later
+# todo: sandbox / harden exim:
+# 1. stop it from running as root. how?
+# https://www.exim.org/exim-html-current/doc/html/spec_html/ch-security_considerations.html
+# * avoid using .forward files, remove that router
+# * set deliver_drop_privilege
+# * set user to run as Debian-exim in systemd
+# * set port to something like 2500, and forward 25 to 2500 with iptables. same for 587.
+# https://superuser.com/questions/710253/allow-non-root-process-to-bind-to-port-80-and-443/1334552#1334552
+# * consider whether other routers like postmaster need modification / removal.
+# 2. restrict its filesystem access from within systemd
+
+# todo: harden dovecot. need to do some research. one way is for it to only listen on a wireguard vpn interface, so only clients that are on the vpn can access it.
+# todo: consider hardening cups listening on 0.0.0.0
+# todo: stop/disable local apache, and rpc.mountd, and kdeconnect when not in use.
+# todo: check that spamd and unbound only listen locally.
+
# todo: hosts should only allow external mail that is authed and
# destined for backup route. it is a minor issue since traffic is
# limited to the wghole network.
m systemctl enable $service;
done
}
-sstart() {
- for service; do
- m systemctl enable --now $service;
- done
-}
mailhost() {
[[ $HOSTNAME == "$MAIL_HOST" ]]
}
# our nostart pi fails to avoid enabling
-# * user forward file
-case $HOSTNAME in
- $MAIL_HOST)
- # afaik, these will get ignored on MAIL_HOST because they are routing to my own
- # machine, but rm them is safer
- rm -fv $uhome/.forward /root/.forward
- ;;
- *)
- # this can\'t be a symlink and has permission restrictions
- # it might work in /etc/aliases, but this seems more proper.
- e setting $uhome/.forward to $forward
- install -m 644 {-o,-g}$u <(e $forward) $uhome/.forward
- ;;
-esac
-
# * Mail clean cronjob
i /etc/systemd/system/mailclean.timer <<'EOF'
WantedBy=multi-user.target
EOF
+i /etc/systemd/system/mailbindwatchdog.service <<EOF
+[Unit]
+Description=Watchdog to restart services relying on systemd-resolved dir
+After=syslog.target network-online.target
+Wants=network-online.target
+BindsTo=mailnn.service
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/mailbindwatchdog $vpnser ${nn_progs[@]} unbound.service radicale.service
+Restart=always
+# time to sleep before restarting a service
+RestartSec=1
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
# old service name
# * common exim4 config
+## old, not using forward files anymore
+rm -fv $uhome/.forward /root/.forward
+
+
# Make all system users be aliases. preventative
-# measure for things like cron mail for user without alias
-awk 'BEGIN { FS = ":" } ; $6 !~ /^\/home/ { print $1 }' /etc/passwd| while read -r user; do
+# prevents things like cron mail for user without alias
+awk 'BEGIN { FS = ":" } ; $6 !~ /^\/home/ || $7 ~ /\/nologin$/ { print $1 }' /etc/passwd| while read -r user; do
if [[ ! $user ]]; then
continue
fi
fi
done
+
+awk 'BEGIN { FS = ":" } ; $6 ~ /^\/home/ && $7 !~ /\/nologin$/ { print $1 }' /etc/passwd| while read -r user; do
+ case $HOSTNAME in
+ $MAIL_HOST)
+ sed -i "/^user:/d" /etc/aliases
+ ;;
+ *)
+ if ! grep -q "^$user:" /etc/aliases; then
+ echo "$user: root" |m tee -a /etc/aliases
+ fi
+ ;;
+ esac
+done
+
if ! grep -q "^ncsoft:" /etc/aliases; then
echo "ncsoft: graceq2323@gmail.com" |m tee -a /etc/aliases
fi
#### begin dl roundcube
# note, im r2e subbed to https://github.com/roundcube/roundcubemail/releases.atom
- v=1.4.11; f=roundcubemail-$v-complete.tar.gz
+ v=1.4.13; f=roundcubemail-$v-complete.tar.gz
cd /a/opt
if [[ -e $f ]]; then
timestamp=$(stat -c %Y $f)
m phpenmod -v php mcrypt imap
# dpkg says this is required
m a2enmod proxy_fcgi setenvif
- fpm=$(dpkg-query -s php-fpm | sed -nr 's/^Depends:.* (php[^ ]*-fpm)( .*|$)/\1/p') # eg: php7.3-fpm
+ fpm=$(dpkg-query -s php-fpm | sed -nr 's/^Depends:.* (php[^ ]*-fpm)( .*|$)/\1/p') # eg: php7.4-fpm
phpver=$(dpkg-query -s php-fpm | sed -nr 's/^Depends:.* php([^ ]*)-fpm( .*|$)/\1/p')
m a2enconf $fpm
# 3 useless guides on php fpm fcgi debian 10 later, i figure out from reading
CHECK_RCPT_VERIFY_SENDER = true
# default config comment says: If you enable this, you might reject legitimate mail,
# but eggs has had this a long time, so that seems unlikely.
-CHECK_DATA_VERIFY_HEADER_SYNTAX = true
CHECK_RCPT_SPF = true
CHECK_RCPT_REVERSE_DNS = true
CHECK_MAIL_HELO_ISSUED = true
# note changes here also require change in passwd.client
route_list = * eximbackup.b8.nz
same_domain_copy_routing = yes
+errors_to = alerts@iankelling.org
no_more
EOF
.endif
hosts_require_auth = *
hosts_try_auth = *
- return_path = alerts@iankelling.org
envelope_to_add
- # manual return path because we dont want it to be the envelope sender
+ # manual return path because we want it to be the envelope sender
# we got not the one we are using in this smtp transport
headers_add = "Return-path: $sender_address"
.ifdef REMOTE_SMTP_SMARTHOST_HOSTS_AVOID_TLS
# this avoids some error. i cant remember what. todo:
# test it out and document why/if its needed.
- i /etc/exim4/host_local_deny_exceptions <<'EOF'
-mail.fsf.org
-*.posteo.de
-EOF
+# i /etc/exim4/host_local_deny_exceptions <<'EOF'
+# mail.fsf.org
+# *.posteo.de
+# EOF
# cron email from smarthost hosts will automatically be to
# USER@FQDN. I redirect that to alerts@, on the smarthosts, but in
# 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.
+ #
+ # # TODO: remove mx.iankelling.org once systems get updated mail-setup from jan 2022
cat >>/etc/exim4/update-exim4.conf.conf <<EOF
# man page: is used to build the local_domains list, together with "localhost"
# this is duplicated in a later router.
-dc_other_hostnames='iankelling.org;zroe.org;r2e.iankelling.org;!je.b8.nz;!bk.b8.nz;*.b8.nz;b8.nz'
+dc_other_hostnames='iankelling.org;zroe.org;r2e.iankelling.org;mx.iankelling.org;!je.b8.nz;!bk.b8.nz;*.b8.nz;b8.nz'
EOF
echo | /a/exe/cedit nn /etc/hosts || [[ $? == 1 ]]
echo | /a/exe/cedit mail /etc/dnsmasq-servers.conf || [[ $? == 1 ]]
+
if $bhost_t; then
+ install -d /bu
+ install -d -g $u -o $u -m 771 /bu/md
i /etc/exim4/conf.d/transport/30_backup_maildir <<EOF
# modified debian maildir transport
backup_maildir:
transport = backup_maildir
EOF
+ # Bind to wghole to receive mailbackup.
+ # todo: will wghole fail to start without internet connectivity?
+ # if so, we need to set it automatically restart infinitely,
+ # and same with exim.
wgholeip=$(sed -rn 's/^ *Address *= *([^/]+).*/\1/p' /etc/wireguard/wghole.conf)
cat >>/etc/exim4/update-exim4.conf.conf <<EOF
dc_other_hostnames='eximbackup.b8.nz'
dc_local_interfaces='127.0.0.1;::1;$wgholeip'
-
EOF
else
cat >>/etc/exim4/update-exim4.conf.conf <<EOF
$MAIL_HOST|bk)
# config for the non-nn exim
m rsync -ra --delete /etc/exim4/ /etc/myexim4
+ # If we ever wanted to have a separate spool,
+ # we could do it like this.
+# cat >>/etc/exim4/conf.d/main/000_local-nn <<'EOF'
+# spool_directory = /var/spool/myexim4
+# EOF
cat >>/etc/myexim4/update-exim4.conf.conf <<'EOF'
dc_eximconfig_configtype='smarthost'
dc_smarthost='nn.b8.nz'
m systemctl daemon-reload
fi
-sstart epanicclean.timer
+m systemctl --now enable epanicclean.timer
case $HOSTNAME in
je)
ln -sf 127.0.0.1-resolv/stub-resolv.conf /etc/resolv.conf
;;&
$MAIL_HOST|bk)
- sstart mailnn mailnnroute
+ m systemctl --now enable mailnn mailnnroute
;;&
$MAIL_HOST)
# we use dns to start wg
if $reload; then
sre unbound
else
- sstart unbound
+ m systemctl --now enable unbound
fi
;;&
$MAIL_HOST|bk)
if $reload; then
sre $vpnser
else
- sstart $vpnser
+ m systemctl --now enable $vpnser
fi
if ! systemctl is-active clamav-daemon >/dev/null; then
- sstart clamav-daemon
+ m systemctl --now enable clamav-daemon
out=$(rsync -aiSAX --chown=root:root --chmod=g-s /a/bin/ds/filesystem/etc/systemd/system/epanicclean.{timer,service} /etc/systemd/system)
if [[ $out ]]; then
reload=true
# need to wait a bit before restarting exim, else I
# get a paniclog entry like: spam acl condition: all spamd servers failed
sleep 3
- sstart mailclean.timer
+ m systemctl --now enable mailclean.timer
;;&
$MAIL_HOST)
# < 2.1 (eg: in t9), uses a different data format which required manual
# migration. dont start if we are running an old version.
if dpkg --compare-versions $(dpkg -s radicale | awk '$1 == "Version:" { print $2 }') ge 2.1; then
- sstart radicale
+ m systemctl --now enable radicale
fi
;;&
esac
sre exim4
+case $HOSTNAME in
+ $MAIL_HOST)
+ m systemctl --now enable mailbindwatchdog
+ ;;
+ *)
+ soff mailbindwatchdog
+ ;;
+esac
+
+
case $HOSTNAME in
bk) sre exim4in ;;
esac
test_to="testignore@expertpathologyreview.com, testignore@je.b8.nz, testignore@amnimal.ninja, jtuttle@gnu.org"
cat >>/etc/cron.d/mailtest <<EOF
-2 * * * * $u check-remote-mailqs |& log-once check-remote-mailqs
+2 * * * * root check-remote-mailqs |& log-once check-remote-mailqs
EOF
;;&
bk)
cat >/usr/local/bin/send-test-forward <<'EOF'
#!/bin/bash
olds=(
-/sbin/exiqgrep -o 260 -i -r '^(testignore@(iankelling\.org|zroe\.org|expertpathologyreview\.com|amnimal\.ninja|je\.b8\.nz)|jtuttle@gnu\.org)$')
+$(/sbin/exiqgrep -o 260 -i -r '^(testignore@(iankelling\.org|zroe\.org|expertpathologyreview\.com|amnimal\.ninja|je\.b8\.nz)|jtuttle@gnu\.org)$')
+)
if (( ${#olds[@]} )); then
/sbin/exim -Mrm "${olds[@]}" >/dev/null
fi
iankelling.org / git / distro-setup / blobdiff