LetsEncrypt SSL

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Tomcat 7 installation

Install and configure letsencrypt

Download an build certbot (letsencrypt client)

  sudo yum -y install python27-devel git
  sudo git clone https://github.com/letsencrypt/letsencrypt /opt/letsencrypt
  /opt/letsencrypt/letsencrypt-auto --debug

Create a config file

  sudo touch /etc/letsencrypt/config.ini
  sudo chmod 777 /etc/letsencrypt/config.ini
  sudo echo "rsa-key-size = 4096" >> /etc/letsencrypt/config.ini
  sudo echo "email = kpe@tempusserva.dk" >> /etc/letsencrypt/config.ini

Generate PKCS12 certificate

Generate a certificate

  sudo mkdir /usr/share/tomcat7/webapps/ROOT
  /opt/letsencrypt/letsencrypt-auto certonly --debug --webroot -w /usr/share/tomcat7/webapps/ROOT -d letsencrypt.tempusserva.dk --config /etc/letsencrypt/config.ini --agree-tos 

Convert to pkcs12 format

  sudo -s

  cd /etc/letsencrypt/live/letsencrypt.tempusserva.dk
  openssl pkcs12 -export -out bundle.pfx -inkey privkey.pem -in cert.pem -certfile chain.pem -password pass:TempusServaSecret
  chmod 755 bundle.pfx
  chmod 755 /etc/letsencrypt/live

  Press: ctrl + d

Install certificate in Tomcat

Edit Tomcat configuration

sudo nano  /usr/share/tomcat7/conf/server.xml

          <Connector
          protocol="org.apache.coyote.http11.Http11NioProtocol"
          port="8443" maxThreads="200"
          scheme="https" secure="true" SSLEnabled="true"
          keystoreFile="/etc/letsencrypt/live/letsencrypt.tempusserva.dk/bundle.pfx" keystorePass="TempusServaSecret"
          ciphers="TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA"
          clientAuth="false" sslProtocol="TLS" keystoreType="PKCS12"/>

Reboot the server

service tomcat7 restart

Automated renewals

Before starting test that the renewal process works

/opt/letsencrypt/letsencrypt-auto renew --dry-run

Make sure the path is accessible from cron

 sudo chmod go+x /etc/letsencrypt/archive
 sudo chmod go+x /etc/letsencrypt/live

Make a script file

sudo nano /usr/bin/tsrefreshcerts.sh

.... containing the following commands

/opt/letsencrypt/letsencrypt-auto renew
cd /etc/letsencrypt/live/letsencrypt.tempusserva.dk
openssl pkcs12 -export -out bundle.pfx -inkey privkey.pem -in cert.pem -certfile chain.pem -password pass:TempusServaSecret
/usr/bin/tstomcatrestart.sh

Now add a job to the crontab

 sudo crontab -l > tempcron
 echo "0 0 1 * * /usr/bin/tsrefreshcerts.sh" >> tempcron
 sudo crontab tempcron
 rm tempcron   

Problems with Amazon Linux ?

In case the autorenewal process fails try updating the dependencies and pip

 sudo /opt/eff.org/certbot/venv/bin/pip2 install cryptography zope interface 
 sudo /opt/eff.org/certbot/venv/bin/pip2 install --upgrade pip
 sudo rsync -avz /opt/eff.org/certbot/venv/lib64/python2.7/dist-packages/ /opt/eff.org/certbot/venv/lib/python2.7/dist-packages/