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Status Delivered
Workspace MQ, MQ Advanced & MQ Appliance
Created by Guest
Created on Jun 22, 2022

RELATED IDEAS

.Net Standard version(9.x) of IBM MQ library should honor WMQ_SSL_CIPHER_SPEC Config on MQ connection factory while doing TLS Handshake with MQ Server.

As of now, 9.2 version of .netstandard lib of IBM MQ uses OS cipher suite to define the client cipher during TLS handshake with server and only uses WMQ_SSL_CIPHER_SPEC to determine the TLS protocol of cipher which is misleading.

Because of current behavior of lib, during SSL handshake it always pick the highest order cipher(in MQ server) for TLS handshake and try to match it with channel cipher. For example if I am using 9.1 on MQ Server, TLS handshake will always happen with TLS_RSA_WITH_AES_128_CBC_SHA256 while if I am using 9.2 cipher TLS handshake will always happen with TLS_RSA_WITH_AES_256_GCM_SHA384.

Please refer documentation for the default order of cipher - https://www.ibm.com/docs/en/ibm-mq/9.2?topic=cipherspecs-cipherspec-order-in-tls-handshake.

Even if we change the order of cipher in mq.ini, We will always pick the first cipher in the list. This create a problem in following use case.

I have two app running on same machine (Windows/Linux) and each trying to connect to channel which have different cipher from each other.

Idea priority Urgent
  • Admin
    Mark Taylor
    Reply
    |     Sep 6, 2022

    Something we would like to do, but it does first require an update to the MQ package to be based on .Net 6 frameworks. It can't be added to the current implementation.

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