Re: [squid-users] strip domain/realm from icap header username

From: Nick Cairncross <>
Date: Fri, 12 Nov 2010 14:09:58 +0000

On 12/11/2010 13:59, "guest01" <> wrote:

>We are using squid 3.1.8 (on RHEL5.5 64Bit) as authentication/caching
>forward proxy and an ICAP server for authorization and content
>At the moment, most of the users are authenticated by NTLM (we are
>planning for Kerberos) and the username is sent to our ICAP server
>which will do an LDAP lookup. This setup works pretty good for our
>default domain. If an user from a different, trusted domain will be
>authenticated by NTLM, then the username sent to the ICAP server will
>look like:
>The ICAP server cannot handle that during the LDAP lookup, the domain
>part has to be removed. I know that I can do that with Kerberos (there
>is an -r option in the negotiate_kerberos_auth-helper, at least in
>3.2x branch), but at the moment, I don't have that option for NTLM.
>Does anyone have any ideas how to easily solve that? (I know that in
>Freeradius, Freeradius will strip off the domain itself, that's why I
>am guessing that ntlm_auth cannot do that)
>Our plan is to upgrade to Kerberos and get rid of that problem, but if
>there occur troubles, we have to find a way to solve that problem by
>using NTLM. The "easiest" way I figured out is to modify the
> and modify the icap header username, e.g. if there is
>a domain part, remove it. But that would cause some maintainance
>troubles after upgrades (we must not forget changing this file)
>I don't think it is a common problem (ntlm with multiple domains and
>icap), if I am wrong it may be a possible feature request. E.g. adding
>a new config option for squid.conf which will remove the domain part
>if enabled and an option for specifing the separator (most likely a +)
>best regards

Not sure if this helps but Smb.conf can use the tag: winbind use
default domain = false OR true

If set to 'true' then DOMAIN\ is omitted. Might cause issues for
non-domain machines and other such, but it might help..? Otherwise, if
it's your own ICAP service can it be modified to exclude?

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Received on Fri Nov 12 2010 - 14:10:08 MST

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