Re: GSSAPI vs GSS-SPNEGO

[Dan White <dwhite@cafedemocracy.org>]

On 12/28/14 11:24 -0500, Brendan Kearney wrote:
> On Sun, 2014-12-28 at 02:50 +0000, Howard Chu wrote:
> > Brendan Kearney wrote:
> > > i want to use the "pass-through" auth mechanism with sasl, so that i
> > > validate credentials against the kerberos database, and not have to
> > > maintain passwords in multiple places.
>
> ok, then i have misunderstood PLAIN vs SIMPLE, it seems.  i will back up
> and explain what i am trying to do.
>
> apache, dhcp and freeradius can all use ldap for various functionality.
> they all use what i now believe to be SIMPLE auth, where they are using
> "cn=user,dc=domain,dc=tld" as ldap usernames.  these processes are using
> ldap for authentication, whereas i have only kerberos authentication
> setup in my environment (and ldap authorization).  my hope was that sasl
> could allow me to push the ldap authN request through to kerberos, and
> in essence proxy the authentication.

This is a valid use of pass-through in my opinion, but you'll want to
protect the authentication as Howard mentioned over ldapi:/// ideally, or
tls otherwise.

pass-through does not require that you advertise any other sasl mechanisms,
such as plain, since it does not involve sasl over the wire. To use, see:

http://www.openldap.org/doc/admin24/security.html#Pass-Through%20authentication

Add 'pwcheck_method: saslauthd' to your libsasl slapd.conf file, and should
need nothing else unless you're using a non standard location for your
saslauthd mux.

Verify that your slapd user has permissions to access the saslauthd mux,
and verify your saslauthd config with testsaslauthd.

--
Dan White