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This page consists of an SSL error message troubleshooting reference followed by a discussion of SSL in Java that puts many of the solutions in context. |
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PKIX path building errors are by far the most common SSL errors reported on the cas-user@lists.jasig.org mailing list. The problem here is that the CAS client does not trust the certificate presented by the CAS server; most often this occurs because of using a self-signed certificate on the CAS server. To resolve this error, import the CAS server certificate into the system truststore of the CAS client. If the certificate is issued by your own PKI, it is better to import the root certificate of your PKI into the CAS client truststore. See SSL Troubleshooting and Reference Guide#Import Import Trusted Certificate for examples of importing a trusted certificate into a Java truststore.
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It is also worth checking that the certificate your CAS server is using for SSL encryption matches the one the client is checking against. For example, if your CAS server's ticket validator URL is https://subdomain.correctdomain.com/<something> and you have accidentally configured Tomcat to use the certificate for *.wrongdomain.com in it's SSL connector. You will get a bad certificate warning in the browser on the login page to hint at a problem but you ignore that warning (because you are using self signed certificates during development) and continue. Ticket validation will then fail with "java.security.cert.CertificateException: No name matching subdomain.correctdomain.com found" because the public key the CAS server is providing is for *.wrongdomain.com. The CAS client looks for the *.wrongdomain.com certificate in cacerts and then tries to find a matching CN or alternate within that certificate. It will completely ignore the beautifully crafted *.correctdomain.com certificate you carefully imported into cacerts.
Wildcard Certificates
JSSE support for wildcard certificates is limited to hosts strictly in the same domain as the wildcard. For example, a certificate with CN=.vt.edu matches hosts *a.vt.edu and b.vt.edu, but not a.b.vt.edu.
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