[Samba] NFSv4 / Krb / wildcard in keytab

L.P.H. van Belle belle at bazuin.nl
Thu Mar 31 09:25:06 UTC 2016 

Try it like : 

http/%s at DOMAIN.COM 

not http/*@DOMAIN.COM

Greetz, 

Louis


> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Service
> Informatique IF
> Verzonden: donderdag 31 maart 2016 11:04
> Aan: samba at lists.samba.org
> CC: ifinfo at ujf-grenoble.fr
> Onderwerp: [Samba] NFSv4 / Krb / wildcard in keytab
> 
> Hi,
> 
> I'm trying to use wildcard in keytab because i don't want join every
> computer, client for service NFS krb5.
> 
> I add a spn like this
> 
> # samba-tool spn add host/* nfs
> 
> (I create user nfs before)
> 
> # samba-tool spn list nfs
> nfs
> User CN=nfs,CN=Users,DC=if,DC=ujf-grenoble,DC=fr has the following
> servicePrincipalName:
>           host/*
> 
> I export keytab :
> 
>   #samba-tool domain exportkeytab /tmp/wildcardnfs.keytab --
> principal=host/*
> 
> ktutil -k /tmp/wildcardnfs.keytab list
> /tmp/wildcardnfs.keytab:
> 
> Vno  Type              Principal                  Aliases
>    1  des-cbc-crc       host/*@IF.UJF-GRENOBLE.FR
>    1  des-cbc-md5       host/*@IF.UJF-GRENOBLE.FR
>    1  arcfour-hmac-md5  host/*@IF.UJF-GRENOBLE.FR
> 
> 
> I put this keytab on my client (name is bataille) and restart rpc.gssd -
> vvvv
> 
> I try to mount NFS and in my client log, I have :
> Mar 31 10:52:23 bataille rpc.gssd[3790]: No key table entry found for
> root/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR while getting keytab
> entry for 'root/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: No key table entry found for
> nfs/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR while getting keytab
> entry for 'nfs/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: No key table entry found for
> host/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR while getting keytab
> entry for 'host/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We will NOT use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We will NOT use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We will NOT use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We will NOT use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We will NOT use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We will NOT use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Processing keytab entry for
> principal 'host/*@IF.UJF-GRENOBLE.FR'
> Mar 31 10:52:23 bataille rpc.gssd[3790]: We WILL use this entry
> (host/*@IF.UJF-GRENOBLE.FR)
> Mar 31 10:52:23 bataille rpc.gssd[3790]: Success getting keytab entry
> for host/*@IF.UJF-GRENOBLE.FR
> 
> Mar 31 10:52:23 bataille rpc.gssd[3790]: WARNING: Client
> 'host/*@IF.UJF-GRENOBLE.FR' not found in Kerberos database while getting
> initial ticket for principal 'host/*@IF.UJF-GRENOBLE.FR' using keytab
> 'FILE:/etc/krb5.keytab'
> 
> Mar 31 10:52:23 bataille rpc.gssd[3790]: ERROR: No credentials found for
> connection to server ifsamba
> Mar 31 10:52:23 bataille rpc.gssd[3790]: doing error downcall
> Mar 31 10:52:23 bataille rpc.gssd[3790]: destroying client
> /run/rpc_pipefs/nfs/clnt1b
> Mar 31 10:52:23 bataille rpc.gssd[3790]: destroying client
> /run/rpc_pipefs/nfs/clnt1a
> 
> And on my server :
> 
> [2016/03/31 10:52:23.036664,  3]
> ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
>    Kerberos: AS-REQ host/*@IF.UJF-GRENOBLE.FR from
> ipv4:152.77.213.108:38741 for krbtgt/IF.UJF-GRENOBLE.FR at IF.UJF-GRENOBLE.FR
> [2016/03/31 10:52:23.038496,  3]
> ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
>    Kerberos: UNKNOWN -- host/*@IF.UJF-GRENOBLE.FR: no such entry found
> in hdb
> [2016/03/31 10:52:23.046352,  3]
> ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
>    Kerberos: AS-REQ host/*@IF.UJF-GRENOBLE.FR from
> ipv4:152.77.213.108:34207 for krbtgt/IF.UJF-GRENOBLE.FR at IF.UJF-GRENOBLE.FR
> [2016/03/31 10:52:23.047710,  3]
> ../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
>    Kerberos: UNKNOWN -- host/*@IF.UJF-GRENOBLE.FR: no such entry found
> in hdb
> 
> I wish use nfsv4 with krb but without join all my clients in Samba4 : is
> it possible ?
> 
> PS : I try to create a spn with HOST/* (host uppercase) because when i
> show spn on a computer joined in Samba, i have this :
> 
> 
> root at ifsamba:/scripts# samba-tool spn list CARTAN$
> cartan$
> User CN=cartan,CN=Computers,DC=if,DC=ujf-grenoble,DC=fr has the
> following servicePrincipalName:
>           HOST/CARTAN
>           HOST/cartan.if.ujf-grenoble.fr
> 
> but on my client rpc.gssd don't use the keytab when HOST is uppercase :
> log :
> Mar 31 09:55:28 bataille rpc.gssd[3777]: No key table entry found for
> BATAILLE$@IF.UJF-GRENOBLE.FR while getting keytab entry for
> 'BATAILLE$@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: No key table entry found for
> root/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR while getting keytab
> entry for 'root/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: No key table entry found for
> nfs/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR while getting keytab
> entry for 'nfs/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: No key table entry found for
> host/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR while getting keytab
> entry for 'host/bataille.ujf-grenoble.fr at IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: Processing keytab entry for
> principal 'HOST/*@IF.UJF-GRENOBLE.FR'
> Mar 31 09:55:28 bataille rpc.gssd[3777]: We will NOT use this entry
> (HOST/*@IF.UJF-GRENOBLE.FR)
> Mar 31 09:55:28 bataille rpc.gssd[3777]: ERROR:
> gssd_refresh_krb5_machine_credential: no usable keytab entry found in
> keytab /etc/krb5.keytab for connection with host ifsamba
> Mar 31 09:55:28 bataille rpc.gssd[3777]: ERROR: No credentials found for
> connection to server ifsamba
> 
> 
> What is the right process ?
> 
> Thank you in advance
> Sim
> 
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