Implement fetchmail (#260) (#271)

To retrieve emails from external mail accounts.

Dockerfile

@@ -7,7 +7,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update -q --fix-missing && \
 	apt-get -y install --no-install-recommends \
 	postfix dovecot-core dovecot-imapd dovecot-pop3d dovecot-sieve dovecot-managesieved gamin amavisd-new spamassassin razor pyzor libsasl2-modules \
 	clamav clamav-daemon libnet-dns-perl libmail-spf-perl bzip2 file gzip p7zip unzip arj rsyslog \
-    opendkim opendkim-tools opendmarc curl fail2ban ed iptables && \
+    opendkim opendkim-tools opendmarc curl fail2ban ed iptables fetchmail && \
 	curl -sk http://neuro.debian.net/lists/trusty.de-m.libre > /etc/apt/sources.list.d/neurodebian.sources.list && \
 	apt-key adv --recv-keys --keyserver hkp://pgp.mit.edu:80 0xA5D32F012649A5A9 && \
 	apt-get update -q --fix-missing && apt-get -y upgrade fail2ban && \
@@ -51,6 +51,10 @@ ADD target/opendkim/default-opendkim /etc/default/opendkim
 ADD target/opendmarc/opendmarc.conf /etc/opendmarc.conf
 ADD target/opendmarc/default-opendmarc /etc/default/opendmarc
 
+# Configure fetchmail
+ADD target/fetchmail/fetchmailrc /etc/fetchmailrc_general
+RUN sed -i 's/START_DAEMON=no/START_DAEMON=yes/g' /etc/default/fetchmail
+
 # Configures Postfix
 ADD target/postfix/main.cf target/postfix/master.cf /etc/postfix/
 

Makefile

@@ -13,7 +13,7 @@ build:
 generate-accounts:
 	docker run --rm -e MAIL_USER=user1@localhost.localdomain -e MAIL_PASS=mypassword -t $(NAME) /bin/sh -c 'echo "$$MAIL_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MAIL_USER -p $$MAIL_PASS)"' > test/config/postfix-accounts.cf
 	docker run --rm -e MAIL_USER=user2@otherdomain.tld -e MAIL_PASS=mypassword -t $(NAME) /bin/sh -c 'echo "$$MAIL_USER|$$(doveadm pw -s SHA512-CRYPT -u $$MAIL_USER -p $$MAIL_PASS)"' >> test/config/postfix-accounts.cf
-	
+
 run:
 	# Run containers
 	docker run -d --name mail \
@@ -51,6 +51,13 @@ run:
 		--cap-add=NET_ADMIN \
 		-h mail.my-domain.com -t $(NAME)
 	sleep 20
+	docker run -d --name mail_fetchmail \
+		-v "`pwd`/test/config":/tmp/docker-mailserver \
+		-v "`pwd`/test":/tmp/docker-mailserver-test \
+		-e ENABLE_FETCHMAIL=1 \
+		--cap-add=NET_ADMIN \
+		-h mail.my-domain.com -t $(NAME)
+	sleep 20
 	docker run -d --name mail_disabled_amavis \
 		-v "`pwd`/test/config":/tmp/docker-mailserver \
 		-v "`pwd`/test":/tmp/docker-mailserver-test \
@@ -97,4 +104,4 @@ tests:
 
 clean:
 	# Remove running test containers
-	docker rm -f mail mail_pop3 mail_smtponly mail_fail2ban fail-auth-mailer mail_disabled_amavis mail_disabled_spamassassin mail_disabled_clamav
+	docker rm -f mail mail_pop3 mail_smtponly mail_fail2ban mail_fetchmail fail-auth-mailer mail_disabled_amavis mail_disabled_spamassassin mail_disabled_clamav

README.md

@@ -16,6 +16,7 @@ Includes:
 - opendkim
 - opendmarc
 - fail2ban
+- fetchmail
 - basic [sieve support](https://github.com/tomav/docker-mailserver/wiki/Configure-Sieve-filters) using dovecot
 - [LetsEncrypt](https://letsencrypt.org/) and self-signed certificates
 - [integration tests](https://travis-ci.org/tomav/docker-mailserver)
@@ -111,6 +112,10 @@ Otherwise, `iptables` won't be able to ban IPs.
   - **empty** => Managesieve service disabled
   - 1 => Enables Managesieve on port 4190
 
+##### ENABLE_FETCHMAIL
+  - **empty** => `fetchmail` disabled
+  - 1 => `fetchmail` enabled
+
 ##### SA_TAG
 
   - **2.0** => add spam info headers if at, or above that level

config/fetchmail.cf

@@ -0,0 +1,13 @@
+## Example configuration: IMAP
+#poll imap.example.com with proto IMAP
+#	user 'username' there with
+#	password 'secret'
+#	is 'user1@domain.tld'
+#	here ssl
+
+## Example configuration: POP3
+#poll pop3.example.com with proto POP3
+#	user 'username' there with
+#	password 'secret'
+#	is 'user2@domain.tld'
+#	here options keep ssl

target/fetchmail/fetchmailrc

@@ -0,0 +1,7 @@
+# General options
+
+set daemon 300
+set syslog
+
+# Fetch rules
+

target/start-mailserver.sh

@@ -352,6 +352,15 @@ if [ -f /tmp/docker-mailserver/dovecot.cf ]; then
   /usr/sbin/dovecot reload
 fi
 
+# Enable fetchmail daemon
+if [ "$ENABLE_FETCHMAIL" = 1 ]; then
+  if [ -f /tmp/docker-mailserver/fetchmail.cf ]; then
+    cat /etc/fetchmailrc_general /tmp/docker-mailserver/fetchmail.cf > /etc/fetchmailrc
+  fi
+  echo "Fetchmail enabled"
+  /etc/init.d/fetchmail start
+fi
+
 # Start services related to SMTP
 if ! [ "$DISABLE_SPAMASSASSIN" = 1 ]; then
   /etc/init.d/spamassassin start

test/config/fetchmail.cf

@@ -0,0 +1,5 @@
+poll pop3.example.com with proto POP3
+	user 'username' there with
+	password 'secret'
+	is 'user2@domain.tld'
+	here options keep ssl

test/tests.bats

@@ -37,6 +37,16 @@
   [ "$status" -eq 0 ]
 }
 
+@test "checking process: fetchmail (disabled in default configuration)" {
+  run docker exec mail /bin/bash -c "ps aux --forest | grep -v grep | grep '/usr/bin/fetchmail'"
+  [ "$status" -eq 1 ]
+}
+
+@test "checking process: fetchmail (fetchmail server enabled)" {
+  run docker exec mail_fetchmail /bin/bash -c "ps aux --forest | grep -v grep | grep '/usr/bin/fetchmail'"
+  [ "$status" -eq 0 ]
+}
+
 @test "checking process: amavis (amavis disabled by DISABLE_AMAVIS)" {
   run docker exec mail_disabled_amavis /bin/bash -c "ps aux --forest | grep -v grep | grep '/usr/sbin/amavisd-new'"
   [ "$status" -eq 1 ]
@@ -436,6 +446,20 @@
   [ "$status" -eq 1 ]
 }
 
+#
+# fetchmail
+#
+
+@test "checking fetchmail: gerneral options in fetchmailrc are loaded" {
+  run docker exec mail_fetchmail grep 'set syslog' /etc/fetchmailrc
+  [ "$status" -eq 0 ]
+}
+
+@test "checking fetchmail: fetchmail.cf is loaded" {
+  run docker exec mail_fetchmail grep 'pop3.example.com' /etc/fetchmailrc
+  [ "$status" -eq 0 ]
+}
+
 #
 # system
 #