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In TLS client profile, you can set the validate server hostname property to validate the hostname in the server certificate and use the Hostname validation flags property on the Advanced tab to fine-tune the validation methods and settings during the handshake.
https://www.ibm.com/docs/en/datapower-gateway/10.5.x?topic=profiles-creating-tls-client-profile
Hopefully this meets your requirement, otherwise please feel free to open another idea.
I suspect we could settle for enforcement of RFC6125 6.4 if the exact cert is not present for validation. There are so many requests about this on DeveloperWorks and it is apparently a big issue to many in charge of security compliance. They think if DP doesn't follow the RFC, it is "vulnerable", and sometimes we can't convince them otherwise.
So, the simplest form of this would be:
1. In the crypto profile, just have an optional checkbox (default is OFF) "Enforce RFC6125 6.4" or "Enforce Domain Name Checking" or *something*.
2. If that is on, DataPower would match the CN/SANs of the certificate with that of the request.