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Alexey Lobanov 07-26-2010 08:13 AM

NTLM: incorrect bytecount for NEGPROT response data
 
Hello all.

I use several Debian servers running since 2005. All them use
Samba->NTLM->Cyrus SASL authentication chain for Cyrus IMAP and Postfix
SMTP services, in very trivial form:


pwcheck_method: saslauthd
mech_list: plain ntlm
ntlm_server: 127.0.0.1

The problem: upon upgrade from Samba 3.0 to Samba 3.2, the NTLM
athentication dies both for SMTP and IMAP clients, with the following
log records:


Jul 22 17:40:22 obolon postfix/smtpd[26140]: NTLM server step 1
Jul 22 17:40:22 obolon postfix/smtpd[26140]: client flags: ffff8207
Jul 22 17:40:22 obolon postfix/smtpd[26140]: NTLM: incorrect bytecount
for NEGPROT response data

Same happens both with Debian-provided Samba (3.2.5 in Lenny) and with
self-built Samba 3.2.4; no difference. Old self-built Samba 3.0.25
authenticates SASL clents fine, without any problems.


Can anyone offer any explanations, configuration changes or diagnostic
tests?


Alexey


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Alexey Lobanov 07-28-2010 01:06 PM

NTLM: incorrect bytecount for NEGPROT response data
 
Self-reply.

The essence of problem seems to be the stalled Cyrus SASL version in
Debian. Both 2.1.22 in Stable and 2.1.23 in Testing have
"plugins/ntlm.c" code unchanged since 2005.


This piece of code had been patched by CMU team intensively in 2009
only, in version 2.1.24.


So, I still do not know what to do with production servers. Either to
freeze Samba at 3.0.X or compile Cyrus SASL 2.1.24 from source.


Alexey

On 26/07/10 12:13, Alexey Lobanov wrote:



Hello all.

I use several Debian servers running since 2005. All them use
Samba->NTLM->Cyrus SASL authentication chain for Cyrus IMAP and Postfix
SMTP services, in very trivial form:


pwcheck_method: saslauthd
mech_list: plain ntlm
ntlm_server: 127.0.0.1

The problem: upon upgrade from Samba 3.0 to Samba 3.2, the NTLM
athentication dies both for SMTP and IMAP clients, with the following
log records:


Jul 22 17:40:22 obolon postfix/smtpd[26140]: NTLM server step 1
Jul 22 17:40:22 obolon postfix/smtpd[26140]: client flags: ffff8207
Jul 22 17:40:22 obolon postfix/smtpd[26140]: NTLM: incorrect bytecount
for NEGPROT response data

Same happens both with Debian-provided Samba (3.2.5 in Lenny) and with
self-built Samba 3.2.4; no difference. Old self-built Samba 3.0.25
authenticates SASL clents fine, without any problems.


Can anyone offer any explanations, configuration changes or diagnostic
tests?


Alexey





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