samba4 kerberos user principals with instances

Gémes Géza geza at
Mon Apr 15 22:41:24 MDT 2013

2013-04-16 02:49 keltezéssel, David Mansfield írta:
> On 04/15/2013 06:59 PM, Dewayne wrote:
>> David,
>> The creation of additional principles in samba4 is achieved by 
>> creating a user record and then the spn.
>> Example:
>> samba-tool user create http-user --random-password
>> samba-tool spn add HTTP/  http-user
>> samba-tool domain exportkeytab --principal=HTTP/ 
>> http.keytab
>> Samba4 Kerberos is based on the heimdal implementation. Perhaps you 
>> could be clearer about what aspect you regard as rubbish?
> First and foremost, the "rubbish" was a joke based on the other 
> mailing list thread today that seemed to take over my inbox...  I 
> don't think it's "rubbish" in the least, on the contrary!
> Regarding SPN, I've used it to create service principals, and I can 
> create the SPN on my user,e.g.:
> samba-tool spn add david/admin david
> But I need to obtain a tgt for this principal, so it needs a password 
> somehow, rather than an exported keytab.  It's to be used by a user, 
> to authenticate to a service with a different credential than the 
> "regular" one.  I've seen people using this to restrict root access 
> (user/root at REALM).
> In particular, the cyrus-imap server does not want "regular" users to 
> log in to administer it, or else it screws up the regular mail-reading 
> process.  However, I still need kerberos authentication.  So the 
> recommended approach is to use "user principal instances".
> I'll poke around.  Maybe I can set a password on an SPN somehow.
No, you misunderstood the spn capability. Passwords can be assigned to 
accounts not spns. So I recommend adding a separate (username-admin 
perhaps) account to those users you want to give administrative rights 
(and could assign spns to their accounts)


Geza Gemes

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