FOR EDUCATIONAL PURPOSES ONLY. NO WARRANTY.

Simplistic letsencrypt (https://letsencrypt.org/) client.

• jetztencrypt-v0.4-app.jar

Dependencies: Java 8

java -jar jetztencrypt-v0.4-app.jar --help

java -jar jetztencrypt-v0.4-app.jar \
  --account-key account.key \
  --certificate-key certificate.key \
  --certificate certificate.crt \
  --mode server \
  --server-bind-port 80 \
  --server-bind-address 0.0.0.0 \
  --accept-any-tos true \
  --embedded-identrust-root \
  --hostname some.domain --alt-name some.domain --alt-name www.some.domain

jetztencrypt will check if a suitable certificate (with some days left before it expires) is present or create a new one otherwise. If no account.key file is present a new one will be generated.

The PEM encoded private key file certificate.key and certificate chain certificate.crt may be directly referenced from nginx.

upstream jetztencrypt {
  server localhost:8080;
}

server {
  listen 80;
  
  location /.well-known/acme-challenge/ {
    proxy_pass http://jetztencrypt;
  }
}

server {
  listen 80;
  
  location /.well-known/acme-challenge/ {
    alias /path/to/acme/dir/;
  }
}

Instead of --mode server use --mode directory --acme-directory /path/to/acme/dir/.

When installing a cron job use --log-level warn to silence the output.

You may want to use a wrapper script for easier crontab maintenance:

#!/usr/bin/env bash
java -jar /path/to/jetztencrypt-app.jar \
  --account-key /path/to/letsencrypt.key \
  --certificate-key /path/to/server.key \
  --certificate /path/to/server.crt \
  --mode directory \
  --acme-directory /path/to/acme/ \
  --embedded-identrust-root \
  --accept-any-tos true \
  --log-level warn \
  --hostname some.domain \
  --alt-name www.some.domain --alt-name www2.some.domain \
&& ( /etc/init.d/nginx reload > /dev/null )

Vanilla JDK/JRE installations might not have the required IdenTrust CA certificate installed. Until this changes you may use --embedded-identrust-root to use a bundeled IdenTrust certificate to prevent letsencrypt api calls from failing.

• Why in Java?
• Because i don't have the time and nerves to implement it in some other language.
• Why Java 8?
• I'm lazy. Somebody volunteers to backport/rewrite?

./gradlew bundle

The bundled application jar can be found at build/libs/jetztencrypt-*-app.jar.