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

Steve Leung sjleung at shaw.ca
Thu Dec 10 18:19:24 UTC 2020

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 ?
> https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/guest-access-in-smb2-is-disabled-by-default 

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.


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