Improve modular setup for DKIM

Start Amavis integration

amavis/Dockerfile

@@ -0,0 +1,31 @@
+FROM ubuntu:14.10
+
+ENV DEBIAN_FRONTEND noninteractive
+RUN locale-gen en_GB en_GB.UTF-8 && dpkg-reconfigure locales
+
+# Prerequisites
+RUN apt-get update && apt-get install -y \
+    amavisd-new \
+    spamassassin \
+    libnet-dns-perl \
+    libmail-spf-perl \
+    pyzor \
+    razor && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Set up razor and pyzor
+RUN su - amavis -s /bin/bash && razor-admin -create && razor-admin -register && pyzor discover
+
+COPY ./config/amavis-content_filter_mode /etc/amavis/conf.d/15-content_filter_mode
+
+# Nice place for your settings
+VOLUME ["/mail_settings"]
+
+# Configure boot script
+COPY boot /
+RUN chmod 755 /boot
+
+ENV AMAVIS=true
+
+ENTRYPOINT ./boot; service rsyslog start; amavisd foreground

amavis/boot

@@ -0,0 +1 @@
+#!/bin/bash

email_core/Dockerfile

@@ -29,12 +29,15 @@ ADD ./config/dovecot.imap /etc/dovecot/conf.d/20-imap.conf
 # Nice place for your settings
 VOLUME ["/mail_settings"]
 
-# Configure boot script
+# Copy boot scripts
 COPY boot /
 RUN chmod 755 /boot
+COPY boot.d /boot.d
+RUN chmod -R 755 /boot.d
 
 # Volume to store email
 VOLUME ["/vmail"]
+
 # Add user vmail that ownes mail
 RUN groupadd -g 5000 vmail
 RUN useradd -g vmail -u 5000 vmail -d /vmail -m

email_core/boot

@@ -1,5 +1,6 @@
-# Check if we have SSL certificates in config, otherwise copy it there
+#!/bin/bash
 
+# Check if we have SSL certificates in config, otherwise copy it there
 # First the key file
 if [ -f /mail_settings/ssl-cert-snakeoil.key ]; then
 	cp /mail_settings/ssl-cert-snakeoil.key /etc/ssl/private/ssl-cert-snakeoil.key
@@ -46,20 +47,10 @@ chmod u+w /vmail
 # Add password file
 cp /mail_settings/passwords /etc/dovecot/passwd
 
-
-# OpenDKIM config
-POSTFIX_MAIN_CF=/etc/postfix/main.cf
-if [ ! -z "$OPEN_DKIM" ]; then
-	# Add config block if not present already
-	if grep -q "# OpenDKIM - dockermail" "$POSTFIX_MAIN_CF"; then
-		echo "# OpenDKIM - dockermail" >> "$POSTFIX_MAIN_CF"
-		echo "milter_default_action = accept" >> "$POSTFIX_MAIN_CF"
-		echo "milter_protocol = 2" >> "$POSTFIX_MAIN_CF"
-		echo "smtpd_milters = $OPEN_DKIM_PORT_8891_ADDR" >> "$POSTFIX_MAIN_CF"
-		echo "non_smtpd_milters = $OPEN_DKIM_PORT_8891_ADDR" >> "$POSTFIX_MAIN_CF"
-		echo "# OpenDKIM - dockermail - end" >> "$POSTFIX_MAIN_CF"
+# Run boot scripts
+for SCRIPT in /boot.d/*
+do
+  if [ -f "$SCRIPT" -a -x "$SCRIPT" ]; then
+    "$SCRIPT"
   fi
-else
-	# Remove OpenDKIM block
-	sed '/# OpenDKIM - dockermail/,/# OpenDKIM - dockermail - end/d' "$POSTFIX_MAIN_CF"
-fi
+done

email_core/boot.d/opendkim

@@ -0,0 +1,49 @@
+#!/bin/bash
+echo 'Running opendkim boot script'
+
+export DOCKERMAIL_OPENDKIM_ENV_OPEN_DKIM=true
+export DOCKERMAIL_OPENDKIM_PORT_8891_TCP_ADDR=172.17.0.10
+
+POSTFIX_MAIN_CF=/etc/postfix/main.cf
+
+env_dump=$(printenv)
+
+OPENDKIM_CONFIG_HEADER="# OpenDKIM - dockermail - start"
+OPENDKIM_CONFIG_FOOTER="# OpenDKIM - dockermail - end"
+
+function remove_opendkim () {
+  if grep -q "$OPENDKIM_CONFIG_HEADER" "$POSTFIX_MAIN_CF"; then
+    sed "/$OPENDKIM_CONFIG_HEADER/,/$OPENDKIM_CONFIG_FOOTER/d" "$POSTFIX_MAIN_CF"
+  fi
+}
+
+function add_opendkim () {
+  if ! grep -q "$OPENDKIM_CONFIG_HEADER" "$POSTFIX_MAIN_CF"; then
+    echo "$OPENDKIM_CONFIG_HEADER" >> "$POSTFIX_MAIN_CF"
+
+    echo "milter_default_action = accept" >> "$POSTFIX_MAIN_CF"
+    echo "milter_protocol = 2" >> "$POSTFIX_MAIN_CF"
+
+    if [[ $env_dump =~ ^.*PORT_8891_TCP_ADDR=([0-9\.]*) ]] ; then
+      echo "smtpd_milters = inet:${BASH_REMATCH[1]}:8891" >> "$POSTFIX_MAIN_CF"
+      echo "non_smtpd_milters = inet:${BASH_REMATCH[1]}:8891" >> "$POSTFIX_MAIN_CF"
+    fi
+
+    echo "$OPENDKIM_CONFIG_FOOTER" >> "$POSTFIX_MAIN_CF"
+  else
+    echo "Warning: $POSTFIX_MAIN_CF already contains OpenDKIM configuration, skipping"
+  fi
+}
+
+if [[ $env_dump =~ ^(.+OPEN_DKIM)= ]] ; then
+  if [ ! -z "${BASH_REMATCH[1]}" ]; then
+    echo "OPEN_DKIM env set, enabling email signing"
+    remove_opendkim # Remove first, to refresh IP info
+    add_opendkim
+  fi
+else
+  echo "Cant find OPEN_DKIM env, signing will be disabled"
+  remove_opendkim
+fi
+
+echo 'Finished opendkim boot script'

opendkim/Dockerfile

@@ -16,8 +16,8 @@ VOLUME ["/mail_settings"]
 COPY boot /
 RUN chmod 755 /boot
 
-ENV OPEN_DKIM true
-ENV OPEN_DKIM_PORT_8891_ADDR inet:8891
+ENV OPEN_DKIM=true
 
 EXPOSE 8891
-ENTRYPOINT ./boot; service rsyslog start; opendkim -f -p $OPEN_DKIM_PORT_8891_ADDR
+
+ENTRYPOINT /boot; service rsyslog start; opendkim -f -p inet:8891

opendkim/boot

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Copy OpenDKIM config
 cp /mail_settings/opendkim.conf /etc/opendkim.conf
 cp /mail_settings/mail.private /etc/dkim.key