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 = [email protected]

# 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