[cifs-protocol] encryption key for NetrLogonSamLogonEx
mat at samba.org
Sat Feb 11 16:40:39 MST 2012
A bug report concerning user's session key was reported in samba when
using level 3 validation for NetrLogonSamLogonEx.
I did a bit of investigation and witnessed the corruption if we use
level 3 validation for NetrLogonSamLogonEx and if samba opens more than
1 schannel connection with one DC and is not using the session key of
the latest connection for decrypting the user's session key (and other
encrypted fields) in the Validation 3 response.
I checked that samba is using the same key for encrypting and decrypting
schannel and sensitive fields in the validation 3 response of the
MS-NRPC seems to indicate that the session key should be the same and I
didn't find a trace in the documentation saying that only the latest
session key exchanged during a NetrAuthenticateX and what seems even
more puzzeling is that using the "old" session key for schannel
encryption and decryption works.
Can you explain us the problem ?
I can do TTTrace as the problem is highly reproducible.
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