Let's Encrypt Auto-Renewal script for HAProxy

haproxy.cfg

global
	log /dev/log	local0
	log /dev/log	local1 notice
	chroot /var/lib/haproxy
	stats socket /run/haproxy/admin.sock mode 660 level admin
	stats timeout 30s
	user haproxy
	group haproxy
	daemon
	maxconn 2048
	tune.ssl.default-dh-param 2048

	# Default SSL material locations
	ca-base /etc/ssl/certs
	crt-base /etc/ssl/private

	# Default ciphers to use on SSL-enabled listening sockets.
	# For more information, see ciphers(1SSL). This list is from:
	#  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
	ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
	ssl-default-bind-options no-sslv3

defaults
	log	global
	mode	http
	option	httplog
	option	dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000
	errorfile 400 /etc/haproxy/errors/400.http
	errorfile 403 /etc/haproxy/errors/403.http
	errorfile 408 /etc/haproxy/errors/408.http
	errorfile 500 /etc/haproxy/errors/500.http
	errorfile 502 /etc/haproxy/errors/502.http
	errorfile 503 /etc/haproxy/errors/503.http
	errorfile 504 /etc/haproxy/errors/504.http
	option forwardfor
	option http-server-close

frontend www-http
	bind haproxy_www_public_IP:80
	reqadd X-Forwarded-Proto:\ http
	default_backend www-backend

frontend www-https
	bind haproxy_www_public_IP:443 ssl crt /etc/haproxy/certs/example.com.pem
	reqadd X-Forwarded-Proto:\ https
	acl letsencrypt-acl path_beg /.well-known/acme-challenge/
	use_backend letsencrypt-backend if letsencrypt-acl
	default_backend www-backend

backend www-backend
	redirect scheme https if !{ ssl_fc }
	server www-1 www_1_private_IP:80 check
	server www-2 www_2_private_IP:80 check

backend letsencrypt-backend
	server letsencrypt 127.0.0.1:54321

le-renew-haproxy

#!/bin/bash

web_service='haproxy'
config_file='/usr/local/etc/le-renew-haproxy.ini'
domain=`grep "^\s*domains" $config_file | sed "s/^\s*domains\s*=\s*//" | sed 's/(\s*)\|,.*$//'`
http_01_port='54321'
combined_file="/etc/haproxy/certs/${domain}.pem"

le_path='/opt/letsencrypt'
exp_limit=30;

if [ ! -f $config_file ]; then
        echo "[ERROR] config file does not exist: $config_file"
        exit 1;
fi

cert_file="/etc/letsencrypt/live/$domain/fullchain.pem"
key_file="/etc/letsencrypt/live/$domain/privkey.pem"

if [ ! -f $cert_file ]; then
	echo "[ERROR] certificate file not found for domain $domain."
fi

exp=$(date -d "`openssl x509 -in $cert_file -text -noout|grep "Not After"|cut -c 25-`" +%s)
datenow=$(date -d "now" +%s)
days_exp=$(echo \( $exp - $datenow \) / 86400 |bc)

echo "Checking expiration date for $domain..."

if [ "$days_exp" -gt "$exp_limit" ] ; then
	echo "The certificate is up to date, no need for renewal ($days_exp days left)."
	exit 0;
else
	echo "The certificate for $domain is about to expire soon. Starting Let's Encrypt (HAProxy:$http_01_port) renewal script..."
	$le_path/letsencrypt-auto certonly --agree-tos --renew-by-default --config $config_file --http-01-port $http_01_port

	echo "Creating $combined_file with latest certs..."
	sudo bash -c "cat /etc/letsencrypt/live/$domain/fullchain.pem /etc/letsencrypt/live/$domain/privkey.pem > $combined_file"

	echo "Reloading $web_service"
	/usr/sbin/service $web_service reload
	echo "Renewal process finished for domain $domain"
	exit 0;
fi

le-renew-haproxy.ini

# This is an example of the kind of things you can do in a configuration file.
# All flags used by the client can be configured here. Run Let's Encrypt with
# "--help" to learn more about the available options.

# Use a 4096 bit RSA key instead of 2048
rsa-key-size = 4096

# Uncomment and update to register with the specified e-mail address
email = you@example.com

# Uncomment and update to generate certificates for the specified
# domains.
domains = example.com, www.example.com

# Uncomment to use a text interface instead of ncurses
# text = True

# Uncomment to use the standalone authenticator on port 443
# authenticator = standalone
standalone-supported-challenges = http-01

# Uncomment to use the webroot authenticator. Replace webroot-path with the
# path to the public_html / webroot folder being served by your web server.
# authenticator = webroot
# webroot-path = /usr/share/nginx/html

Thanks for the script! This is quite awesome. I made a fork that will go through multiple config files and their domains, log errors, and even email with mutt if installed.

Thank for the Script, it work is good.

You should get rid of 3DES. https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/ stopped recommending it

Does this gist still work with the specified port?

certbot/certbot#2697 seems to suggest that when specifying a port, a web server will be created; however, the authentication request will still be sent through port 80?

@WilliamHua I'm not using this script - but from the looks of it:

the acl rule letsencrypt-acl will intercept any request made on the https port that is to the challenge folder (.well-known/acme-challenge) and redirect it to the correct (standalone) port. So letsencrypt should respond to requests sent to port 443 (doesn't look like it's configured to forward them on port 80 though).

@thisismitch thanks for this gist!
Can you please briefly explain, what the line
server letsencrypt 127.0.0.1:54321
in the haproxy.cfg
does exactly? Is the "letsencrypt" just setting a symbolic name? And how do I make sure there is actually something listening on port 54321?

how to use this for multiple domain with multiple lets encrypt?