[Samba] 4.13.2 guest access denied with "Bad SMB2 signature"

Jeremy Allison jra at samba.org
Thu Dec 10 18:25:09 UTC 2020

On Thu, Dec 10, 2020 at 11:19:24AM -0700, Steve Leung via samba wrote:
>On 2020-12-10 10:42 a.m., Jeremy Allison wrote:
>>On Thu, Dec 03, 2020 at 10:39:37AM -0700, Steve Leung via samba wrote:
>>>Guest access to file shares in Samba 4.13.2 seems to be broken.  
>>>The logs report a "Bad SMB2 signature" error, and the client sees 
>>>an "access denied" error.  This looks like a regression IMO, but 
>>>I'd like to check that I'm not doing something wrong.
>>Correct me if I'm wrong, but doesn't guest access prohibit
>>signing and encryption ?
>That does sound correct, and I'd agree that there are many situations 
>where guest access is a Bad Idea.
>But it's still a documented (and presumably supported?) Samba 
>configuration that has worked in the past - if that's changing then it 
>should be made explicit.
>For myself, it's something I can work around without much fuss, but 
>I'm just concerned that I've stumbled upon a regression.

I think if it worked in the past it may have been an accident.

There's no session key that can be used for
signing I think.

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