[Samba] CIFS proxy

Andrew Bartlett abartlet at samba.org
Fri Jul 22 17:40:57 MDT 2011

On Fri, 2011-07-22 at 12:30 -0300, Maximiliano Bertacchini wrote:
> Hi. We managed to get samba 4 cifs proxy working with s4u2proxy auth in 
> an AD environment. The problem is it won't let clients neither write 
> files larger than 16441 bytes nor read files larger than 65536 bytes.
> For example, writing a 16641 byte file works ok, but writing a 16642 
> byte (or larger) file fails:

My guess is that we are failing to clamp the maximum packet size when
doing SMB signing.  It seems Microsoft only signs the first 16641 (or
so) bytes of the packet, and not the 'extra large' packets that Samba
can support. 

If SMB signing is disabled (or perhaps enabled on both ends?) then this
should work, and confirm my theory. 

Andrew Bartlett

Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org

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