123 lines
5.6 KiB
Bash
123 lines
5.6 KiB
Bash
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#!/bin/sh
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# MAS Postfix integration profile (MAS-WP-0004). Configures an installed
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# Postfix to receive mail for one MAS domain and hand every recipient to
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# mas-gateway. See README.md for why each setting is needed.
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#
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# install.sh --domain D --statute FILE --app-url URL [--gateway CMD] [--auth]
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# [--relay HOST:PORT --relay-credentials DIR]
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#
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# --relay sends outbound mail (the app's replies) through an authenticated
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# submission relay; DIR holds the files username and password. Without it
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# all outbound mail fails fast.
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# --auth adds sender authentication (OpenDKIM verify + OpenDMARC milters,
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# annotate-only) and strips forged Authentication-Results for D. The caller
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# starts the milters (opendkim -f -x /etc/opendkim.conf, opendmarc -f -c
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# /etc/opendmarc.conf) and Postfix.
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set -e
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GATEWAY=/usr/local/bin/mas-gateway
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AUTH=no
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while [ $# -gt 0 ]; do
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case "$1" in
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--domain) DOMAIN=$2; shift 2 ;;
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--statute) STATUTE=$2; shift 2 ;;
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--app-url) APP_URL=$2; shift 2 ;;
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--gateway) GATEWAY=$2; shift 2 ;;
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--auth) AUTH=yes; shift ;;
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--relay) RELAY=$2; shift 2 ;;
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--relay-credentials) RELAY_CREDS=$2; shift 2 ;;
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*) echo "install.sh: unknown argument $1" >&2; exit 64 ;;
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esac
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done
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: "${DOMAIN:?--domain is required}" "${STATUTE:?--statute is required}" "${APP_URL:?--app-url is required}"
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DOMAIN_RE=$(printf '%s' "$DOMAIN" | sed 's/\./\\./g')
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# 1. Relay control. Stock reject_unauth_destination refuses every local-part
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# containing '!' or '%' (sender-specified routing), so it cannot be used.
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# An explicit regexp permits only @DOMAIN; everything else hits the final
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# 'reject' (smtpd will not start without a reject-class entry).
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# allow_untrusted_routing=yes is needed, otherwise Postfix ignores the
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# regexp result for '!'/'%' local-parts. It is safe here because
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# relay_domains is empty and nothing rewrites such addresses (2.).
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printf '/@%s$/ permit\n' "$DOMAIN_RE" > /etc/postfix/mas_rcpt.regexp
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postconf -e \
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"myhostname=$DOMAIN" "mydomain=$DOMAIN" "mydestination=$DOMAIN" "relay_domains=" \
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"mynetworks=127.0.0.0/8" \
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"smtpd_relay_restrictions=permit_mynetworks,check_recipient_access regexp:/etc/postfix/mas_rcpt.regexp,reject" \
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"allow_untrusted_routing=yes"
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# 2. Never rewrite MAS syntax: no bang-path swap, no percent hack.
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postconf -e "swap_bangpath=no" "allow_percent_hack=no"
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# 3. Every recipient of DOMAIN goes to the mas pipe, one recipient per call,
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# as the envelope recipient Postfix received. recipient_delimiter=+ does
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# not change ${recipient}; it only lets Postfix know facets exist.
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postconf -e "local_transport=mas" "local_recipient_maps=" \
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"mas_destination_recipient_limit=1" "recipient_delimiter=+"
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if ! grep -q '^mas[[:space:]]' /etc/postfix/master.cf; then
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cat >> /etc/postfix/master.cf <<CF
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mas unix - n n - - pipe
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flags=Rq user=mas argv=$GATEWAY
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--statute $STATUTE --trusted-authserv-id $DOMAIN
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pipe --app-url $APP_URL --recipient \${recipient}
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CF
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fi
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# 4. Hygiene for a mail endpoint that only receives.
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postconf -e "disable_vrfy_command=yes" "smtpd_helo_required=yes" "smtpd_recipient_limit=20"
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# 5. Outbound. Only loopback may send (mynetworks), so this is the app's
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# replies. Postfix's own bounces (null sender) are discarded rather than
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# relayed, so the app's send cap bounds everything sent through the relay.
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if [ -n "$RELAY" ]; then
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: "${RELAY_CREDS:?--relay needs --relay-credentials}"
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printf '%s %s:%s\n' "$RELAY" "$(cat "$RELAY_CREDS/username")" \
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"$(cat "$RELAY_CREDS/password")" > /etc/postfix/sasl_passwd
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chmod 600 /etc/postfix/sasl_passwd && postmap /etc/postfix/sasl_passwd
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postconf -e "relayhost=$RELAY" "smtp_sasl_auth_enable=yes" \
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"smtp_sasl_password_maps=hash:/etc/postfix/sasl_passwd" \
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"smtp_sasl_security_options=noanonymous" "smtp_tls_security_level=secure" \
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"smtp_tls_CApath=/etc/ssl/certs" \
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"sender_dependent_default_transport_maps=inline:{<>=discard:}" \
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"empty_address_default_transport_maps_lookup_key=<>"
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else
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postconf -e "default_transport=error:5.7.1 outbound mail disabled"
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fi
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[ "$AUTH" = yes ] || exit 0
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# 6. Sender authentication (spec 14 item 10): annotate only, never reject,
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# accept if a milter is down. Our own replies (loopback) are skipped.
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# header_checks drop incoming A-R headers claiming DOMAIN; they do not
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# apply to milter-added headers, so only the milters' results survive.
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# (OpenDKIM's RemoveARFrom did not remove them in testing.)
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mkdir -p /run/opendkim /run/opendmarc
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chown opendkim:opendkim /run/opendkim && chown opendmarc:opendmarc /run/opendmarc
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printf '127.0.0.1\n' > /etc/opendkim-peers
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cat > /etc/opendkim.conf <<CONF
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Mode v
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Socket inet:8891@127.0.0.1
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AuthservID $DOMAIN
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PeerList /etc/opendkim-peers
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UserID opendkim
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PidFile /run/opendkim/opendkim.pid
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Syslog no
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CONF
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cat > /etc/opendmarc.conf <<CONF
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Socket inet:8893@127.0.0.1
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AuthservID $DOMAIN
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TrustedAuthservIDs $DOMAIN
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SPFSelfValidate true
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SPFIgnoreResults true
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RejectFailures false
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PublicSuffixList /usr/share/publicsuffix/public_suffix_list.dat
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UserID opendmarc
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PidFile /run/opendmarc/opendmarc.pid
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Syslog false
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CONF
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printf '/^Authentication-Results:[[:space:]]*%s([[:space:];]|$)/ IGNORE\n' "$DOMAIN_RE" \
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> /etc/postfix/ar_strip.regexp
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postconf -e "header_checks=regexp:/etc/postfix/ar_strip.regexp" \
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"smtpd_milters=inet:127.0.0.1:8891,inet:127.0.0.1:8893" "non_smtpd_milters=" \
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"milter_default_action=accept" "milter_protocol=6"
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