[CentOS] Kerberos integration in directory server

Dan Burkland dburklan at NMDP.ORG
Wed Jan 27 14:08:00 UTC 2010


> -----Original Message-----
> From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
> Behalf Of nimmermehr at chello.at
> Sent: Wednesday, January 27, 2010 6:29 AM
> To: centos at centos.org
> Subject: [CentOS] Kerberos integration in directory server
> 
> > > -----Original Message-----
> >> From: centos-bounces at centos.org [mailto:centos-bounces at
> centos.org] On
> >> Behalf Of nimmermehr at chello.at
> >> Sent: Tuesday, January 26, 2010 6:23 AM
> >> To: centos at centos.org
> >> Subject: [CentOS] Kerberos integration in directory server
> >>
> >> Hi,
> >>
> >> Got some issues regarding Kerberos and Directory Server and hope
> someone
> >> can help me out.
> >> Used these for the configiruation :
> >> http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-
> kerberos.html
> >> http://www.redhat.com/docs/manuals/dir-server/8.1/install/index.html
> >>
> >> Server : CentOS 5.4 with Kerberos and Directory Server installed
> >> Client : CentOS 5.4
> >>
> >> I use putty to connect to the client, which authenticates against the
> >> server.
> >> Using Kerberos or LDAP worked perfectly (using system-config-
> >> authentication on the client for configuration)
> >>
> >> The only thing that doesn't seem to work is the kerberized version of
> the
> >> login via LDAP on the directory Server. Shouldn't I get a Kerberos
> ticket
> >> for that ? If I activate kerberos AND ldap in system-config-
> authentication
> >> it fails :
> >>
> >> Jan 25 13:24:59 monarch sshd[3947]: pam_unix(sshd:auth): check pass;
> user
> >> unknown
> >> Jan 25 13:24:59 monarch sshd[3947]: pam_unix(sshd:auth): authentication
> >> failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.0.1
> >> Jan 25 13:24:59 monarch sshd[3947]: pam_succeed_if(sshd:auth): error
> >> retrieving information about user testuser
> >> Jan 25 13:25:01 monarch sshd[3947]: Failed password for invalid user
> >> testuser from 192.168.0.1 port 1142 ssh2
> >>
> >> I followed the instructions here :
> >> http://directory.fedoraproject.org/wiki/Howto:Kerberos
> >>
> >> Maybe I just didn't get it ;)
> >>
> >> Thanks in advance,
> >>
> >> Peter
> >> _______________________________________________
> >> CentOS mailing list
> >> CentOS at centos.org
> >> http://lists.centos.org/mailman/listinfo/centos
> 
> >My setup is a tad different than yours in that I integrated MIT Kerberos
> with OpenLDAP. While our configurations are different I'm sure >you're
> trying for kerberized logins (System authenticates against Kerberos and
> pulls account information from LDAP). If so here are >some items you may
> want to verify you have included in your system-auth config file.
> 
> >Auth	sufficient	pam_krb5.so use_first_pass
> >Auth	sufficient	pam_unix.so nullok try_first_pass
> 
> >Account sufficient	pam_ldap.so
> >Account required	pam_unix.so
> 
> >Password sufficient pam_krb5.so
> >Password sufficient pam_unix.so sha512 shadow nullok try_first_pass
> use_authok
> 
> >Session	optional	pam_keyinit.so revoke
> >Session	optional	pam_krb5.so
> 
> >Dan
> 
> Just to see if I understood it correctly :
> It is mandatory that every LDAP-User has a functional Kerberos-login (user
> and PW). Is it possible for such a user to access a server that only has
> ldap for authentication and checks against the LDAP-Server ?
> 
> About testing : How can I check if the information is pulled out of ldap ?
> 
> Thanks in advance :)
> 
> Peter
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

If you are utilizing Kerberos on the authentication part of the process then you need the user to exist in LDAP also as Kerberos cannot hold Unix account information (UID #, GID#, etc). I'm not too certain on where Directory Server stores its log files but you should be able to check there for lookups for "username" around the time of attempted login.  

Dan 


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