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How do you test for OCSP?
2 Answers
- Extract server and issuer certificates from somewhere (SSL connection most likely)
- Extract the OCSP server list from the server certificate.
- Generate a OCSP request using the server and issuer certificates.
- Send the request to the OCSP server and get a response back.
- Optionally validate the response.
How do you check if SSL certificate has been revoked?
To check the revocation status of an SSL Certificate, the client connects to the URLs and downloads the CA’s CRLs. Then, the client searches through the CRL for the serial number of the certificate to make sure that it hasn’t been revoked.
How does certificate revocation work?
Certificate revocation is the act of invalidating a TLS/SSL before its scheduled expiration date. A certificate should be revoked immediately when its private key shows signs of being compromised. Here, instead of downloading and parsing the entire CRL, the client can send the certificate in question to the CA.
What are the two ways that you can check to see if a certificate has been revoked?
There are two ways the client can do this: It manually checks the certificate revocation list for the certificate in question. It sends an OCSP request to an OCSP responder to check the revocation status for the specific certificate via the CA’s revocation server.
How does OCSP work to validate a certificate?
An OCSP client issues a status request to an OCSP responder and suspends acceptance of the certificate in question until the responder provides a response. Basically, OCSP is a mechanism where a client can ask the CA if a certificate is valid. This method is better than Certificate Revocation List (CRL).
What’s the difference between CRL and OCSP validation?
Online Certificate Status Protocol (OCSP) – OCSP is a protocol for checking revocation of a single certificate interactively using an online service called an OCSP responder. CRL and OCSP validation are two different ways to achieve the same result: denying access to any user whose certificate is revoked.
How does OCSP work and what does it mean?
An OCSP client issues a status request to an OCSP responder and suspends acceptance of the certificate in question until the responder provides a response. Basically, OCSP is a mechanism where a client can ask the CA if a certificate is valid.
Which is the online responder in OCSP TechNet?
Online Responder (Or OSCP Responder) is the server component, which accepts requests from OCSP client to check the revocation status of a certificate. Before making the request, client uses AIA extension to check whether OSCP is configured, and if yes what is the OSCP responder location.