Dell S4048T-ON, Configuration Manual

Page: 1145 / 1146

NOTE: If you have an IPv6 address in the URL, then enclose this address in square brackets. For example, http://
[1100::203]:6514.
Configuring OCSP behavior
You can configure how the OCSP requests and responses are signed when the CA or the device contacts the OCSP responders.
To configure this behavior, follow this step:
In CONFIGURATION mode, enter the following command:
crypto x509 ocsp {[nonce] [sign-request]}
Both the
none
and
sign-request
parameters are optional. The default behavior is to not use these two options. If your OCSP
responder uses pre-computed responses, you cannot use the
none
feature in the switch's communcations with the responder. If your
OCSP responder requires signed requests, you can use the sign-requests option.
Configuring Revocation Behavior
You can configure the system behavior if an OCSP responder fails.
By default, when all the OCSP responders fail to send a response to an OSCP request, the system accepts the certificate and logs the
event. However, you can configure the system to reject the certificate in case OCSP responders fail.
To configure OCSP revocation settings:
In CONFIGURATION mode, enter the following command:
crypto x509 revocation ocsp [accept | reject]
The default behavior is to accept certificates if either an OCSP responder is unavailable or if no responder is identified.
Configuring OSCP responder preference
You can configure the preference or order that the CA or a device follows while contacting multiple OCSP responders.
Enter the following command in Certificate mode:
ocsp-server prefer
Verifying certificates
A CA certificate’s public key is used to decrypt a presented certificate’s signature to obtain a hash value.
The rest of the presented certificate is also hashed and if the two hashes match then the certificate is considered valid.
During verification, the system checks the presented certificates for revocation information. The system also enables you to configure
behavior in case a certificate’s revocation status cannot be verified; for example, when the OCSP responder is unreachable you can alter
system behavior to accept or reject the certificate depending on configuration. The default behavior is to accept the certificates. The
system also logs the events where the OSCP responders fail or invalid OSCP responses are received.
NOTE: A CA certificate can also be
revoked.
X.509v3 1145