Bug 645726 - nss_ldap fails to get netgroup from ldap
nss_ldap fails to get netgroup from ldap
Product: Fedora
Classification: Fedora
Component: nss_ldap (Show other bugs)
Unspecified Unspecified
low Severity medium
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Assigned To: Nalin Dahyabhai
Fedora Extras Quality Assurance
Depends On:
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Reported: 2010-10-22 06:05 EDT by David Jansen
Modified: 2012-08-16 15:36 EDT (History)
4 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2012-08-16 15:36:46 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
/etc/nss_ldap.conf (9.59 KB, text/plain)
2010-10-22 11:12 EDT, David Jansen
no flags Details

  None (edit)
Description David Jansen 2010-10-22 06:05:34 EDT
Description of problem:
We have a setup here where every fedora desktop system has a partion shared over nfs, giving access to machines in a certain netgroup, which is defined in ldap. 
Up to Fedora 12 and RHEL 5.5, it works to have
netgroup:   files ldap
in /etc/nsswitch.conf and the netgroup is automatically picked up and used.
Contents of /etc/exports:
/data1	@netname(rw,root_squash,sync,secure)

Now with Fedora 14 beta, the nfs share is not accessible from other computers, error is:
Oct 22 10:54:45 eendracht rpc.mountd[1354]: refused mount request from xx.xx.xx.xx for /data (/data): unmatched host
(where xx is ip address of nfs client attempting to acces the disk).

Temporary workaround: a small script which uses ldapsearch to retrieve the netgroup from ldap, and write it to /etc/netgroup . So that also shows, that netgroup support in the nfs server is not the issue, it must be something in nss_ldap that fails to read the netgroup and pass it on to programs that request it.
Apart from some sanity checking, my script does this to create the netgroup file:
ldapsearch -LLL -x 'cn=netname'|egrep '^cn:|^nisNetgroupTriple:' | awk -F: 'ORS=" " {print $2}'

Version-Release number of selected component (if applicable):
Comment 1 Nalin Dahyabhai 2010-10-22 10:30:38 EDT
Can you attach a copy of your /etc/ldap.conf?  I'm wondering if you're using TLS and are running into a problem stemming from the switch from OpenSSL to NSS for the crypto.
Comment 2 David Jansen 2010-10-22 11:12:42 EDT
Created attachment 455107 [details]

There is no /etc/ldap.conf. Do you mean /etc/nss_ldap.conf? I'll attatch that file, just to be sure.
Anyway, TLS is being used, and all other information from ldap is working (users, passwords, groups, automount info)
Comment 3 Nalin Dahyabhai 2010-10-22 11:52:22 EDT
(In reply to comment #2)
> Created attachment 455107 [details]
> /etc/nss_ldap.conf
> There is no /etc/ldap.conf. Do you mean /etc/nss_ldap.conf? I'll attatch that
> file, just to be sure.

Yes, that's right.  I can't believe I forgot that I changed the name of the configuration file to remove that ambiguity.

> Anyway, TLS is being used, and all other information from ldap is working
> (users, passwords, groups, automount info)

TLS makes this sound vaguely like bug #636956, also in part because rpc.mountd uses fork().  Does the workaround from https://bugzilla.redhat.com/show_bug.cgi?id=636956#c36, made to the "nfs" init script, make a difference?
Comment 4 Dmitri Pal 2010-10-22 16:28:19 EDT
Also just FYI. SSSD has released 1.4 that will be available as a 0 day errata for F14 that will support netgroups. Would you mind considering it as an alternative to using nss_ldap in your deployment?
Comment 5 David Jansen 2010-10-25 08:56:00 EDT
The workaround in the nfs init script doesn't seem to make a difference. But if SSSD can do netgroups, that would be fine too.
Comment 6 Moritz Baumann 2010-10-31 05:32:00 EDT
I wasn't sure if its better to post here or to create a bug report against the rawhide package:

The field ldap_netgroup_search_base does not get evaluated.

in /etc/sssd/sssd.conf:
ldap_search_base = ou=isg,ou=inf,ou=auth,o=ethz,c=ch
ldap_netgroup_search_base = ou=netgroup,ou=inf,ou=auth,o=ethz,c=ch

and /var/log/sssd/sssd_D.ETHZ.CH.log shows after a "getent netgroup baumanmo":

(Sun Oct 31 10:25:14 2010) [sssd[be[D.ETHZ.CH]]] [sdap_get_generic_send] (6): calling ldap_search_ext with [(&(cn=baumanmo)(objectclass=nisNetgroup))][ou=isg,ou=inf,ou=auth,o=ethz,c=ch].

How to reproduce (was running on RHEL6 Beta 2 refresh):
   * rebuild ding-libs-0.1.2-3.fc15.src.rpm, sssd-1.4.0-2.fc15.src.rpm on system and install it.
   * configure sssd.conf with the lines above (+ have a otherwise running config)
   * in /etc/nsswitch.conf change settings to netgroup:  files sss
   * restart service sssd
   * do your netgroup query and watch how it uses ldap_search_base rather than ldap_netgroup_search_base.
Comment 7 Stephen Gallagher 2010-11-01 06:49:32 EDT
(In reply to comment #6)
> I wasn't sure if its better to post here or to create a bug report against the
> rawhide package:

BZ #648150 is tracking this issue in SSSD.
Comment 8 Fedora End Of Life 2012-08-16 15:36:48 EDT
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