[keycloak-user] Docker X509 Apache Cert Lookup Client Certificate Passthrough

[Johnson, Freddie [USA]]

Team --

I'm currently having issues getting Keycloak to read the client certificate forwarded from proxy in HTTP header from Apache using Apache SPI Cert lookup. Instead, it reads the wildcard of the cert provided below in the virtual host of *.xxx.ninja from SSLProxyMachineCertificateFile. However, if i use that common name of the wildcard and assign it to any user, Keycloak will log that user in even though that is not the user originally making the initial request to the proxy. In short, how do I force Keycloak running in a container to use the apache spi to retrieve cert credentials in header? I tried developer documentation by adding spi per https://www.keycloak.org/docs/latest/server_admin/index.html#client-certificate-lookup to both standalone.xml and deployment folder but it's as if Keycloak is not recognizing the configuration change in container after build. If I remove SSLProxyMachineCertificateFile from Apache, Keycloak sends a message to the proxy saying "downstream server expected client cert but none configured" so that option didn't work either. Details below:

My apache reverse proxy is:

<VirtualHost *:443>
    SSLEngine on
    SSLProxyEngine on
    SSLVerifyClient optional
    SSLVerifyDepth 4
    SSLOptions +ExportCertData
    SSLProxyCheckPeerName off
    ProxyPreserveHost On

    SSLProxyCACertificateFile "/usr/local/apache2/conf/ca-xxx-ninja.crt"
    SSLCACertificateFile "/usr/local/apache2/conf/xxx_authorities.pem"
    SSLProxyMachineCertificateFile "/usr/local/apache2/conf/proxy-wildcard-xxx-ninja.pem"

    RequestHeader set SSL_CLIENT_CERT ""
    RequestHeader set SSL_CLIENT_CERT_CHAIN_4 ""

    ServerName sso.xxx.ninja
    ProxyPass / https://keycloak:8443/
    ProxyPassReverse / https://keycloak:8443/
    ProxyRequests Off
    RequestHeader set X-Forwarded-Port "443"
    RequestHeader set X-Forwarded-Proto "https"
    RequestHeader set SSL_CLIENT_CERT "%{SSL_CLIENT_CERT}i"
    RequestHeader set CERT_CHAIN "%{SSL_CLIENT_CERT_CHAIN_4}i"
</VirtualHost>

My Keycloak Dockerfile (abbreviated - sanitized):

ENV "X509_CA_BUNDLE"="/opt/xxx/xxx_authorities.pem"
USER root
RUN mkdir -p /etc/x509/https
RUN mkdir -p /opt/xxx
COPY "./certs/tls.crt" "/etc/x509/https"
COPY "./certs/tls.key" "/etc/x509/https"
COPY "./standalone.xml" "/opt/jboss/keycloak/standalone/configuration/standalone.xml" <---- originally edited this file to hold apache spi
COPY "./apache.xml" "/opt/jboss/keycloak/standalone/deployments/apache.xml" < ------- moved apache spi for x509 here per online instructions
COPY "./certs/ca-xxx-ninja.crt" "/opt"
COPY "./certs/xxx/xxx_authorities.pem" "/opt/xxx/"
RUN keytool -noprompt -import -trustcacerts -alias root -file /opt/ca-xxx-ninja.crt -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit
RUN keytool -noprompt -import -trustcacerts -alias xxx -file /opt/xxx/xxx_authorities.pem -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit
USER 1000
EXPOSE 8080 8443

Any guidance/ideas you can provide would much appreciated as I've been working it for a few days now and can't seem to get over this last hurdle.

Respectfully,


Freddie Lee Johnson, Jr.