Re: [Samba] Problem with winbind not seeing a user as part of a group

Tue, 12 Feb 2008 19:09:47 -0800 

Trimble, Ronald D wrote:



I have never explored those options.  We have auth fall through turned 
off.  If the authentication fails, they get a 401 message indicating 
they don't have permissions.



 


Here is an example from our vhosts.conf...


 


        <Location /scm/spar/svn>

                DAV svn

                SVNPATH /scm/spar/svn

                SVNPathAuthz off

                AuthPAM_Enabled on

                AuthPAM_FallThrough off

                AuthType Basic

                AuthName "SPAR Subversion"

                require group "NA\USTR-LINUX-1-SPAR"

                <LimitExcept GET PROPFIND OPTIONS REPORT>

                        require group "NA\USTR-LINUX-1-SPAR"

                </LimitExcept>

        </Location>


 


        <Location /scm/spar/trac>

                SetHandler mod_python

                PythonHandler trac.web.modpython_frontend

                PythonOption TracEnv /scm/spar/trac

                PythonOption TracUriRoot /scm/spar/trac

                AuthPAM_Enabled on

                AuthPAM_FallThrough off

                AuthType Basic

                AuthName "SPAR Trac"

                require group "NA\USTR-LINUX-1-SPAR"

        </Location>


 

 


*From:* Scott Lovenberg [mailto:[EMAIL PROTECTED]
*Sent:* Tuesday, February 12, 2008 9:27 PM
*To:* Trimble, Ronald D
*Cc:* samba@lists.samba.org

*Subject:* Re: [Samba] Problem with winbind not seeing a user as part 
of a group



 


Trimble, Ronald D wrote:

It looks like it is only happening when apache2 is involved.  Although, other 
login methods are far less common.  I have a suspicion it may be related to the 
mod_auth_pam module but what I don't understand is why it is happening.  
Mod_auth_pam makes dozens of requests to winbind for each session.  Why do some 
work and others don't?  Could it be that winbind is overwhelmed and thus 
doesn't return anything?

 
-----Original Message-----

From: Scott Lovenberg [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 12, 2008 9:09 PM
To: Trimble, Ronald D
Cc: samba@lists.samba.org <mailto:samba@lists.samba.org>
Subject: Re: [Samba] Problem with winbind not seeing a user as part of a group

 
Trimble, Ronald D wrote:
  


    Everyone,

                    Here is a challenge for all of you samba experts!  Lately I 
have been seeing a problem where winbind is not correctly identifying a user as 
a member of a group he most certainly belong to.  This is with a Domain Local 
group so I know samba should support it.

                    Users access a HTTPS (SSL) webpage that is secured by a 
Domain Local group.  Sometimes they get in, others they don't.  Here are some 
examples from the logs.


     


    /var/log/apache2/error_log


     


    [Tue Feb 12 18:54:52 2008] [error] [client 172.xx.xxx.xxx] GROUP:

    NA\\selltc not in required group(s)., referer:

    https://ustr-linux-1/scm/spar/trac/browser/trunk/common/include/channe

    ls [Tue Feb 12 18:55:00 2008] [error] [client 172.xx.xxx.xxx] GROUP:

    NA\\selltc not in required group(s)., referer:

    https://ustr-linux-1/scm/spar/trac/browser/trunk/common/include/channe

    ls [Tue Feb 12 18:56:12 2008] [error] [client 172.xx.xxx.xxx] GROUP:

    NA\\selltc not in required group(s)., referer:

    https://ustr-linux-1/scm/spar/trac/browser/trunk/common/include/channe

    ls


     


    However a little later it is mysteriously working again...


     


    /var/log/apache2/access_log


     


    172.xx.xxx.xxx - NA\\selltc [12/Feb/2008:20:02:37 -0500] "GET

    /scm/spar/trac/chrome/common/css/trac.css HTTP/1.1" 304 -

    172.xx.xxx.xxx - NA\\selltc [12/Feb/2008:20:02:37 -0500] "GET

    /scm/spar/trac/chrome/common/css/browser.css HTTP/1.1" 304 -

    172.xx.xxx.xxx - NA\\selltc [12/Feb/2008:20:02:37 -0500] "GET

    /scm/spar/trac/chrome/common/css/diff.css HTTP/1.1" 304 -


     


    Now obviously my example doesn't have the user accessing the same link, but 
it doesn't matter.  Winbind went from identifying the user as not in the group 
to then identifying him as in the group and nothing changed!  This is happening 
several times a day and is driving us insane.  What can I do to figure this 
out?  Has anyone else seen this?


     


    Here is what is going on in the /var/log/samba/log.wb-NA (our domain) log 
at that time for that user.


     


    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_dual.c:child_process_request(479)

      process_request: request fn PAM_AUTH

    [2008/02/12 18:54:52, 3] 
nsswitch/winbindd_pam.c:winbindd_dual_pam_auth(1341)

      [10824]: dual pam auth NA\selltc

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_pam.c:winbindd_dual_pam_auth(1364)

      winbindd_dual_pam_auth: domain: NA last was online

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_pam.c:winbindd_dual_pam_auth_samlogon(1127)

      winbindd_dual_pam_auth_samlogon

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_pam.c:winbindd_dual_pam_auth(1416)

      winbindd_dual_pam_auth_samlogon succeeded

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_cache.c:refresh_sequence_number(472)

      refresh_sequence_number: NA time ok

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_cache.c:refresh_sequence_number(506)

      refresh_sequence_number: NA seq number is now 271835101

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_cache.c:wcache_save_name_to_sid(823)

      wcache_save_name_to_sid: NA\SELLTC ->

    S-1-5-21-725345543-2052111302-527237240-26405 (NT_STATUS_OK)

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_cache.c:refresh_sequence_number(472)

      refresh_sequence_number: NA time ok

    [2008/02/12 18:54:52, 10] 
nsswitch/winbindd_cache.c:refresh_sequence_number(506)

      refresh_sequence_number: NA seq number is now 271835101

    [2008/02/12 18:54:52, 10] nsswitch/winbindd_cache.c:centry_expired(546)

      centry_expired: Key PWD_POL/NA for domain NA is good.

    [2008/02/12 18:54:52, 10] nsswitch/winbindd_cache.c:wcache_fetch(630)

      wcache_fetch: returning entry PWD_POL/NA for domain NA

    [2008/02/12 18:54:52, 10] nsswitch/winbindd_cache.c:password_policy(2108)

      lockout_policy: [Cached] - cached info for domain NA status:

    NT_STATUS_OK

    [2008/02/12 18:54:52, 5] 
nsswitch/winbindd_pam.c:winbindd_dual_pam_auth(1546)

      Setting unix username to [NA\selltc]

    [2008/02/12 18:54:52, 5] 
nsswitch/winbindd_pam.c:winbindd_dual_pam_auth(1578)

      Plain-text authentication for user NA\selltc returned NT_STATUS_OK

    (PAM: 0)


     


    Please let me know if you can help me figure this out.


     


    Thanks,

    Ron


     

     

        


Does authentication ever fail like this from another login point (from a 
desktop login, or other PAM settings)?  Or only when apache is involved?

 
  


Have you checked this?
from mod_auth_pam <http://pam.sourceforge.net/mod_auth_pam/faq.html>

[...]
/6.//

/I get "500 server error" after entering the password for a password 
protected page//



The username you entered is probably not in the system database. In 
that case, mod_auth_pam falls through to mod_auth and mod_auth needs 
more configuration than mod_auth_pam. Solution: Either disable 
fall-through or configure AuthUserFile and AuthGroupFile for mod_auth

[...]


Bah, I'm retarded and saw the hour offset without thinking assumed it 
was the GET return code (500).


This looks a bit more promising!

SourceForge.net: Help 
<http://sourceforge.net/forum/forum.php?thread_id=1414955&forum_id=20642>



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