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Status Future consideration
Workspace z/OS
Categories SSL
Created by Guest
Created on Feb 11, 2021

New Security Type for HTTP and OCSP in System SSL

With enabled Certificate revocation status checking in ATTLS, system SLL offers 3 different security types for HTTP and OSCP (RevocationSecurityLevel = Low, Medium or High)

Low
Certificate validation does not fail if the OCSP responder or HTTP server specified in the HTTP URL value in the CDP extension cannot be contacted.

Medium
Certificate validation requires the OCSP responder or the HTTP server in an HTTP URL value in the CDP extension to be able to be contacted. For an OCSP responder, it must be able to provide a valid certificate revocation status. If the certificate status is revoked or unknown, certificate validation fails. For an HTTP server in the CDP extension, it must be able to be contacted and provide a CRL.

High
Certificate validation requires revocation information to be provided by the OCSP responder or HTTP server. If OCSP revocation checking by using the AIA extension is enabled, the OCSP responder specified in the certificate must be able to be contacted and provide valid certificate revocation status. If HTTP CRL checking is enabled, the HTTP server specified in the HTTP URL values in the CDP extension must be able to be contacted and provide a CRL.

Depending on the chosen security level the SSL handshake will NOT fail if
- the HTTP server cannot be contacted (security level Low) or
- the HTTP server could be contacted but do not provide a valid certificate revocation status (security level Medium)

There is no option to choose that the SSL handshake will NOT fail for both cases.

With this request a new security level should be provided to cover both cases above.

Idea priority High