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Re: ntlmssp: bad ascii: ffffffab (Lan Manager auth broken?)

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On 7/10/2014 6:07 p.m., Victor Sudakov wrote:
> Amos Jeffries wrote:
> 
> [dd]
> 
>>> Apparently so, but as I said, the very same client software
>>> does work with the old "ntlm_auth" helper and does not work
>>> with the new ntlm_smb_lm_auth one.
>>> 
>>> That's why I am saying that the problem is on the
>>> authenticator side and not on the client side.
>> 
>> The client is sending corrupt packets. Old authenticator did not
>> check for the corruption. New one does.
> 
> Which renders the new authenticator useless, at least for me.
> 
>> 
>> Client is still sending corrupt packets, which is why both the 
>> developers have said the problem is in the client.
> 
> The developers could have at least provided the option of 
> compatibility with the old bugs :) There is the old good
> programming creed "be conservative about what you send and liberal
> about what you receive".
> 

The packet *is* accepted. Its the security privileges which are denied.

If you want to accept anything the client sends regardless of the
credentials accuracy there is ntlm_fake_auth.


Using ntlm_fake_auth to retrieve the Windows user account name you can
use an external_acl_type helper to take that name and other
fixed-point details about the client machine (IP, port, ident? etc)
and assign access privileges for them more securely than SMB LM.

Amos

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