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
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
[...]
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