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MQSeries.net Forum IndexIBM MQ SecurityWhy special CipherSuite and CipherSpec in MQ SSL

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Armageddon123
PostPosted: Tue Apr 10, 2018 12:35 pm Post subject: Why special CipherSuite and CipherSpec in MQ SSL Reply with quote

Acolyte

Joined: 11 Feb 2014
Posts: 60

Hi Experts.

in most SSL setups, for example IIB, we create keystore, trustore, then associate it with broker , setup https port , done, done

For MQ only, apart from keystore and trustore setup, we have to mention the CipherSuite/CipherSpec on channel and also on the client Java code.

props.put(MQConstants.SSL_CIPHER_SUITE_PROPERTY, "SSL_RSA_WITH_AES_128_CBC_SHA");

Below link explains the issues with mismatches etc for the cipherspec/ciphersuite , but could not get why we need to really provide it at first place.

https://www.ibm.com/developerworks/community/blogs/messaging/entry/BiteSize_Blogging_MQ_Version_8_The_relationship_between_MQ_CipherSpecs_and_Java_Cipher_Suites?lang=en

Is this a special implementation for SSL/TLS for MQ which needs these ciphersuite or is it am missing some basics?!!!!

Thanks!
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exerk
PostPosted: Wed Apr 11, 2018 1:32 am Post subject: Reply with quote

Jedi Council

Joined: 02 Nov 2006
Posts: 5955

Browsers have an inbuilt list of Cipher Specs, and negotiate down that list until they find a mutually supported one, which can take some time - perhaps IIB uses the same principle? (CAVEAT: The limit of my knowledge with IIB is the ability to spell it!).

Imagine how much faster it would be if you didn't have to do that and used a specific Cipher Spec, or at least a limited list.

No doubt someone will be along that will put us both right soon...
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It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys.

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zpat
PostPosted: Wed Apr 11, 2018 10:15 pm Post subject: Reply with quote

Jedi Council

Joined: 19 May 2001
Posts: 5655
Location: UK

I seem to recall this is changing in more recent MQ versions.
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Well, I don't think there is any question about it. It can only be attributable to human error. This sort of thing has cropped up before, and it has always been due to human error.
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bruce2359
PostPosted: Thu Apr 12, 2018 4:11 am Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8183
Location: US: west coast, almost. Otherwise, enroute.

exerk wrote:
Browsers have an inbuilt list of Cipher Specs, and negotiate down that list until they find a mutually supported one ...

This browser behavior is a well-documented security exposure, as the client end can specify the weakest spec, and the server end will reduce its spec to that level.

MQ allows one spec, the same spec, at both ends, the one explicitly defined in channel definitions - no negotiation.
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I would tell you a UDP joke, but you might not get it.
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Armageddon123
PostPosted: Fri Apr 13, 2018 6:34 am Post subject: Reply with quote

Acolyte

Joined: 11 Feb 2014
Posts: 60

Thanks all for the reply. That is a new learning.
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