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languageen

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).

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Code Block
titlehaproxy.cfg
global
        stats socket  /var/lib/haproxy/stats
        stats timeout 30s



install socat 

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Code Block
titleInstall socat
yum -y install socat



Create script for OCSP stapling and make it executable

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Code Block
titleScript 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/lib/haproxy/stats

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:


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Code Block
/etc/haproxy/haproxy.pem: good
This Update: Mar 25 15:33:54 2019 GMT
Next Update: Mar 28 15:33:54 2019 GMT



Warning

Note: if you get a warning like this:

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OCSP single response: Certificate ID does not match any certificate or issuer.

Then you should be able to fix this by reloading haproxy and running the script again:

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systemctl reload haproxy
/usr/local/bin/haproxy_ocsp_update.sh


Activate CRON job for script

This will execute the script every day.

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Code Block
titlehaproxy.cfg
cat <<EOFF >> /etc/crontab
0  0  *  *  * root /usr/local/bin/haproxy_ocsp_update.sh
EOFF





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languagede

Status
colourRed
titleTHIS PAGE IS ONLY AVAILABLE IN ENGLISH

In letzter Zeit wird mehr Gebrauch von das sogenannte OCSP stapling gemacht, anstatt CRL (Certificate Revocation Lists).

Siehe auch https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol

Falls das OCSP stapling in haproxy aktiviert werden soll, wird folgende Prozedur angewendet.

Siehe auch diese Webseite: https://icicimov.github.io/blog/server/HAProxy-OCSP-stapling/ für eine sehr gute Anleitung und Erklärung dazu, auf den unsere Anleitung hier basiert. 

haproxy.cfg prüfen

Prüfen, dass der stats socket aktiviert ist. Falls ein anderer Socket angegeben ist, muss das Skript unten angepasst werden (zwei Zeilen vor exit 0 - im socat befehl).

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Code Block
titlehaproxy.cfg
global
        stats socket  /var/lib/haproxy/stats
        stats timeout 30s

socat installieren

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Code Block
titleInstall socat
yum -y install socat

Skript für OCSP stapling anlegen und Ausführbar machen

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Code Block
titleScript 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/lib/haproxy/stats

exit 0
EOFF

chmod +x /usr/local/bin/haproxy_ocsp_update.sh

Skript testen

Den Skript ausführen mit: /usr/local/bin/haproxy_ocsp_update.sh

Beispiel-Ausgabe:

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Code Block
/etc/haproxy/haproxy.pem: good
This Update: Mar 25 15:33:54 2019 GMT
Next Update: Mar 28 15:33:54 2019 GMT

CRON Job für Skript aktivieren

Hiermit wird der Skript jeden Tag ausgeführt.

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titlehaproxy.cfg
cat <<EOFF >> /etc/crontab 0 0 * * * root /usr/local/bin/haproxy_ocsp_update.sh EOFF