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Fetchmail GnuPG Web Key Directory Service

This repository holds the working configuration for my multi-domain Gnupg Web Key Directory service install.

This service runs fetchmail against external POP & SMTP servers, checking at a prescribed interval.

How it works

To start, fetchmail, running as a daemon, checks for new messages every 4 minutes, if a message is received, procmail process the message and passes it off to gpg-wks-server.

Once gpg-wks-server finishes processing the message, it normally will send a reply, this is accomplished via ssmtp.

Installing the Repository

First we need to install the needed software.

apt update; apt -y install gnupg git fetchmail ssmtp procmail

Then install the config.

mkdir -p /var/lib/gnupg
git clone git@github.com:mattrude/gnupg-directory-service.git /var/lib/gnupg/wks

Run the install script.

/var/lib/gnupg/wks/wks-maintance-script.sh

After the script has finised, confirm fetchmail is running

ps aux |grep fetchmail |grep -v grep

Update Cron.

18 2   *   *   *   /usr/bin/gpg-wks-server --cron
28 *   *   *   *   /var/lib/gnupg/wks/wks-maintance-script.sh

Adding a new Domain

At this point, adding a new domain consists of adding a new, domain specific, section to the already existing fetchmail.conf file, in the /var/lib/gnupg/wks/etc directory. Then you must create new procmail-example.com.conf and ssmtp-example.com.conf in the same directory so each file can find them.

fetchmail.conf

Start out by going into the /var/lib/gnupg/wks/etc directory and modify the fetchmail.conf file. Each domain must have its own section in the file similar to the following.

poll "pop.googlemail.com" protocol pop3 auth password
username "wkd-submission@example.com" is apprentice here
password '###### POP3 Password ######'
ssl sslproto tls1, sslcertck, idle
fetchall
nokeep
mda "/usr/bin/procmail -m /var/lib/gnupg/wks/etc/procmail-example.com.conf"

After you have added the needed section to fetchmail.conf, you need to create the domains corresponding procmail-example.com.conf file.

procmail-example.com.conf

The provided example procmail-example.conf files are a stable staring point, just change the DOMAIN line to be the domain you wish to process and save the the file accordingly.

DOMAIN=example.com
BASE=/var/lib/gnupg/wks
PATH=$HOME/bin:/usr/bin:/bin:/usr/local/bin
LD_LIBRARY_PATH=$HOME/lib
CORRECTHOME=${BASE}/mailstore/${DOMAIN}
MAILDIR=$CORRECTHOME/
PMDIR=${BASE}/mailstore/${DOMAIN}/procmail
LOGFILE=${BASE}/logs/procmail-${DOMAIN}.log
LOCKFILE=${PMDIR}/.lockmail
VERBOSE=on

:0
* ^FROM_DAEMON
from-daemon/

:0 c
archive/

:0 w
* !^From: wkd-submission@${DOMAIN}
* !^X-WKS-Loop: wks.${DOMAIN}
|/usr/local/bin/gpg-wks-server -v --receive \
    --header X-WKS-Loop=wks.${DOMAIN} \
    --from wkd-submission@${DOMAIN} \
    |/usr/sbin/ssmtp -C ${BASE}/etc/ssmtp-${DOMAIN}.conf -t

:0 e
cruft/

And once you are finished with the procmail-example.com.conf file, you need to create the domains corresponding ssmtp-example.com.conf file.

ssmtp-example.com.conf

Finely after gpg-wks-server finishes its processing, it normally sends a response to the sender. This is accomplished via ssmtp and the something similar to the below ssmtp-example.com.conf file.

All you should have to change on this file is the AuthUser (username) and the AuthPass (password) and save it as the name the domains procemail config file is looking for.

root=wkd-submission
hostname=ns0.another-domain-or-the-same.com
mailhub=smtp.googlemail.com:587
FromLineOverride=YES
UseSTARTTLS=YES
AuthUser=wkd-submission@example.com
AuthPass=###### SMTP Password ######
FromLineOverride=YES

Repository License

This repository is licensed under the 3-Clause BSD License as seen below.

Copyright 2019 Matt Rude <matt@mattrude.com>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation 
and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its 
contributors may be used to endorse or promote products derived from this 
software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGE.

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A working configuration for a Fetchmail GnuPG Web Key Directory/DANE/PKA Server.

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