Hello,
I have problems setting krb5 auth with an xrootd service. The following user principal
KVNO Timestamp Principal
---- ----------------- --------------------------------------------------------
3 01/01/70 01:00:00 [log in to unmask]
obtains the ticket-granting ticket (krgbt) by doing: kinit -kt ./cta-adm-HOST.keytab [log in to unmask]
and then issues admin commands on a host called cta-adm.scd.rl.ac.uk and these commands need to be authorised by an
XRootD service (the XRootD instance name is cta and the systemd name is cta-frontend.service) running on another host
called cta-front01.scd.rl.ac.uk. The krb5 auth for this service is configured as
sec.protocol krb5 /etc/cta/cta-frontend.krb5.keytab [log in to unmask]
sec.protbind * only sss krb5
where the contents of /etc/cta/cta-frontend.krb5.keytab are
KVNO Timestamp Principal
---- ----------------- --------------------------------------------------------
3 01/01/70 01:00:00 [log in to unmask]
However, any attempt to issue admin commands result in the following error on the xrootd log of this cta service
210513 13:58:45 32387 XrootdXeq: User authentication failed; Seckrb5: Unable to extract client name;; No translation available for requested principal ([log in to unmask])
This is thrown by this part of the code in XrdSeckrb5/XrdSecProtocolkrb5.cc
// Decode the credentials and extract client's name
//
if (!rc)
{if ((rc = krb5_rd_req(krb_context, &AuthContext, &inbuf,
(krb5_const_principal)krb_principal,
krb_keytab, NULL, &Ticket)))
iferror = (char *)"Unable to authenticate credentials;";
else if ((rc = krb5_aname_to_localname(krb_context,
Ticket->enc_part2->client,
sizeof(CName)-1, CName)))
iferror = (char *)"Unable to extract client name;";
}
Do you know what is the problem?
Many thanks.
George
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