[OpenAFS-devel] OpenSSH, OpenAFS, Heimdal Kerberos and MITKerberos

Andrei Maslennikov andrei at caspur.it
Tue Jan 27 06:49:28 EST 2004

Hi Douglas, and thanks for your comment.

On Mon, 26 Jan 2004, Douglas E. Engert wrote:

> 1) ssh to host A, login with K5 password (and obtain a PAG-based token)
> Was the ticket marked forwardable?  Can you set with Hiemdal in the
> krb5.conf file a default that tickets should be forwardable? 
> What does klist -f show on host A?

  Yes, tickets are set to be forwardable in the [libdefaults] section:

<ing at alfa ~>klist -f
Credentials cache: FILE:/tmp/krb5cc_k20844
        Principal: ing at ING.UNIROMA1.IT

  Issued           Expires        Flags    Principal                              
Jan 26 20:34:02  Jan 27 03:14:02  FI     
Jan 26 20:34:02  Jan 27 03:14:02         afs at ING.UNIROMA1.IT                      
Jan 26 20:34:31  Jan 27 03:14:02         
host/alfa.ing.uniroma1.it at ING.UNIROMA1.IT

   V4-ticket file: /tmp/tkt401
klist: No ticket file (tf_util)
> 2) from host A, ssh to host B, login w/o pw (this time with GSSAPI)
> GSSAPI should have delegated a K5 credential, and set the KRB5CCNAME
> on host B. 

  This does not occur, however GSSAPI lets me in (without creds):
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: 
debug1: Next authentication method: gssapi       
debug1: Authentication succeeded (gssapi).  <<<<<<<<<<<<<<<<<<
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Requesting X11 forwarding with authentication spoofing.
debug1: Requesting authentication agent forwarding.
Could not chdir to home directory /afs/ing/system/hq/ing: Permission 

> >   3) inside host B: no K5 creds forwarded from host A, no token.
> We can do the above

  ..That's what the "sshd -d" tells me:

debug1: userauth-request for user ing service ssh-connection method gssapi
debug1: attempt 1 failures 1
Postponed gssapi for ing from port 44184 ssh2
debug1: Got no client credentials
Authorized to ing, krb5 principal ing at ING.UNIROMA1.IT (krb5_kuserok)
Accepted gssapi for ing from port 44184 ssh2  <<<<<<<<<<<
Accepted gssapi for ing from port 44184 ssh2
debug1: session_input_channel_req: session 0 req shell
debug1: temporarily_use_uid: 401/401 (e=401/401)
debug1: No credentials stored   <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
debug1: restore_uid: (unprivileged)

  Inside the host B: no credentials at all:

[ing at alfa /]$ /usr/heimdal/bin/klist
klist: No ticket file: /tmp/krb5cc_401

   V4-ticket file: /tmp/tkt401
klist: No ticket file (tf_util)


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