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Status Future consideration
Workspace CICS Transaction Gateway
Categories Runtime
Created by Guest
Created on Sep 6, 2022

RELATED IDEAS

Adding filter to client certificate

In order to be able to accept calls only from authorized clients and not from all those who have a certificate generated by one of the CAs loaded in the ring used by the CTG, it would be useful to be able to configure a list of common name clients, in a similar way to what is possible to do with MQ (https://www.ibm.com/docs/en/ibm-mq/9.3?topic=jms-sslpeername-object-property). In the case of MQ, since there are more channels, a single filter is sufficient, for the CTG it would be necessary to be able to insert a list of NCs or a list of filters for the NCs.

Idea priority High
  • Guest
    Reply
    |     Nov 20, 2023

    I am writing this comment on behalf of a customer. In many companies, in order to comply with the security rules a TLS certificate needs to be signed by an internal intermediate CA. This internal intermediate CA and the internal root CA are then added to the truststore. The issue with this approach is that there may be a lot of TLS certificates signed by the same internal intermediate CA, and they may be used by client applications that must not have access to the CTG server.

    It is not possible to only add the authorized client certificates to the truststore, as during the TLS handshake the authorized signer are provided, and since the client certificates are not self-signed (in this usecase) the client application may choose to comply with eligible signers and not send its client certificate.

    A possible workaround is to create a dedicated internal intermediate CA for the CTG server, but this implies creating an exception or making a special case for the CTG users.

    It would be really helpful if there is a way to filter out authorized clients from unauthorized clients, through CTG configurations.

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