Recently, more use has been made of so-called OCSP stapling instead of CRL (Certificate Revocation Lists).
See also: https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol
If OCSP stapling should be activated in haproxy, the following procedure is used.
See also this website: https://icicimov.github.io/blog/server/HAProxy-OCSP-stapling/ for a very good manual and explanation on which our manual here is based.
check haproxy.cfg
Check that the stats socket is activated. If a different socket is specified, the script must be adjusted below (two lines before exit 0 - in the socat command).
haproxy.cfg
global stats socket /var/lib/haproxy/stats stats timeout 30s
install socat
Install socat
yum -y install socat
Create script for OCSP stapling and make it executable
Script for OCSP stapling
cat <<'EOFF' > /usr/local/bin/haproxy_ocsp_update.sh #!/bin/bash # Certificates path and names DIR="/etc/haproxy" CERT="haproxy.pem" # Get the issuer URI, download it's certificate and convert into PEM format ISSUER_URI=$(openssl x509 -in ${DIR}/${CERT} -text -noout | grep 'CA Issuers' | cut -d: -f2,3) ISSUER_NAME=$(echo ${ISSUER_URI##*/} | while read -r fname; do echo ${fname%.*}; done) wget -q -O- $ISSUER_URI | openssl x509 -inform DER -outform PEM -out ${DIR}/${ISSUER_NAME}.pem # Get the OCSP URL from the certificate ocsp_url=$(openssl x509 -noout -ocsp_uri -in ${DIR}/${CERT}) # Extract the hostname from the OCSP URL ocsp_host=$(echo $ocsp_url | cut -d/ -f3) # Create/update the ocsp response file and update HAProxy openssl ocsp -noverify -no_nonce -issuer ${DIR}/${ISSUER_NAME}.pem -cert ${DIR}/${CERT} -url $ocsp_url -header Host $ocsp_host -respout ${DIR}/${CERT}.ocsp [[ $? -eq 0 ]] && [[ $(pidof haproxy) ]] && [[ -s ${DIR}/${CERT}.ocsp ]] && echo "set ssl ocsp-response $(/usr/bin/base64 -w 10000 ${DIR}/${CERT}.ocsp)" | socat stdio unix-connect:/var/run/haproxy.sock exit 0 EOFF chmod +x /usr/local/bin/haproxy_ocsp_update.sh
Test the script
Run the script with: /usr/local/bin/haproxy_ocsp_update.sh
Example return:
/etc/haproxy/haproxy.pem: good This Update: Mar 25 15:33:54 2019 GMT Next Update: Mar 28 15:33:54 2019 GMT
Activate CRON job for script
This will execute the script every day.
haproxy.cfg
cat <<EOFF >> /etc/crontab 0 0 * * * root /usr/local/bin/haproxy_ocsp_update.sh EOFF