[CentOS] Kerberos/LDAP authentication no more working in 5.6 ?

Alain Péan alain.pean at lpp.polytechnique.fr
Tue Apr 12 12:35:21 UTC 2011


Le 12/04/2011 13:46, John Hodrien a écrit :
> On Sun, 10 Apr 2011, Alain Péan wrote:
>
>> After further verification, it seems to be related to ticket granting.
>> Here is what I have in /var/log/messages :
>> su: pam_krb5[7200]: TGT failed verification using keytab and key for
>> 'host/bardeen.lab-lpp.local at LAB-LPP.LOCAL': Cannot find ticket for
>> requested realm
>
> I've yet to do a full upgrade to 5.6, but I have upgraded pam_krb5 to 
> peek at
> this, and it works fine for me (tested against 2003 and 2008 DCs).
>
> Contents of your /etc/krb5.conf and the output of 'klist -ke' could be
> instructive.
>
> jh

Hi John,

Thnks for your answer. Here are the content of /etc/krb5.conf and klist 
-ke. I agree that there can be siomething missing, that was working 
before...

]# cat /etc/krb5.conf
[logging]
     default = FILE:/var/log/krb5lib.log

[libdefaults]
     ticket_lifetime = 24000
     default_realm = LAB-LPP.LOCAL
     default_tk_enctypes = des3-hmac-sha1 des-cbc-crc
     default_tgs_enctypes = des3-hmac-sha1 des-cbc-crc
     dns_lookup_realm = true
     dns_lookup_kdc = true

[realms]
     LAB-LPP.LOCAL = {
         kdc = pc-lpp1.lab-lpp.local:88
         kdc = pc-lpp2.lab-lpp.local:88
         kdc = pc-lpp3.lab-lpp.local:88
         kdc = pc-lpp4.lab-lpp.local:88
         kdc = pc-lppx.lab-lpp.local:88
         admin_server = pc-lpp1.lab-lpp.local:749
         default_domain = LAB-LPP.LOCAL
     }

[domain_realm]
     .lab-lpp.local = LAB-LPP.LOCAL
     lab-lpp.local = LAB-LPP.LOCAL

and :
]# klist -ke
Keytab name: FILE:/etc/krb5.keytab
KVNO Principal
---- 
--------------------------------------------------------------------------
    2 HOST/centos-test.test-lpp.local at TEST-LPP.LOCAL (DES cbc mode with 
CRC-32)
    2 host/centos-test.test-lpp.local at TEST-LPP.LOCAL (DES cbc mode with 
CRC-32)
    2 host/centos-test.test-lpp.local at TEST-LPP.LOCAL (DES cbc mode with 
RSA-MD5)
    2 host/centos-test.test-lpp.local at TEST-LPP.LOCAL (ArcFour with HMAC/md5)
    2 host/centos-test at TEST-LPP.LOCAL (DES cbc mode with CRC-32)
    2 host/centos-test at TEST-LPP.LOCAL (DES cbc mode with RSA-MD5)
    2 host/centos-test at TEST-LPP.LOCAL (ArcFour with HMAC/md5)
    2 CENTOS-TEST$@TEST-LPP.LOCAL (DES cbc mode with CRC-32)
    2 CENTOS-TEST$@TEST-LPP.LOCAL (DES cbc mode with RSA-MD5)
    2 CENTOS-TEST$@TEST-LPP.LOCAL (ArcFour with HMAC/md5)
    2 HOST/centos-test.test-lpp.local at TEST-LPP.LOCAL (DES cbc mode with 
RSA-MD5)
    2 HOST/centos-test.test-lpp.local at TEST-LPP.LOCAL (ArcFour with HMAC/md5)
    2 HOST/centos-test at TEST-LPP.LOCAL (DES cbc mode with CRC-32)
    2 HOST/centos-test at TEST-LPP.LOCAL (DES cbc mode with RSA-MD5)
    2 HOST/centos-test at TEST-LPP.LOCAL (ArcFour with HMAC/md5)

It is a local domain because it spans multiple real DNS domains.

Alain

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Alain Péan - LPP/CNRS
Administrateur Système/Réseau
Laboratoire de Physique des Plasmas - UMR 7648
Observatoire de Saint-Maur
4, av de Neptune, Bat. A
94100 Saint-Maur des Fossés
Tel : 01-45-11-42-39 - Fax : 01-48-89-44-33
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