Re: OpenLDAP 2.4 authentication methods

[Michael Ströder <michael@stroeder.com>]

Josh Spranger wrote:
> But if I go direct to AD LDAP with UPN it works fine,

As said. It's a AD-specific handling of a simple bind request. RFC 4511
requires BindRequest::name to be an LDAPDN.

See section 4.2 in http://www.ietf.org/rfc/rfc4511.txt

> and I am not sure
> where the authentication is actually performed in Proxy mode, weather it is
> authenticated on the openldap side or if the credentials are passed
> straight through without any processing in openldap.

Normally when using back-ldap password checking is performed on the target
server (here MS AD). But OpenLDAP does not accept this form of simple bind
request since the request is malformed per LDAPv3 standard. And therefore this
malformed request is not passed to MS AD.

=> fix your LDAP clients

Ciao, Michael.

> -----Original Message-----
> From: Michael Ströder [mailto:michael@stroeder.com] 
> Sent: Friday, December 03, 2010 12:14 PM
> To: Josh Spranger
> Cc: 'openldap-technical@openldap.org'
> Subject: Re: OpenLDAP 2.4 authentication methods
> 
> Josh Spranger wrote:
>> I have OpenLDAP version 2.4 installed on an OpenSUSE box. I am using it
>> as an LDAP Proxy to Windows AD domain. It works perfectly using standard
>> LDAP logon credentials (cn=user,DC=domain,DC=com). But I have some
>> applications that use user@domain.com <mailto:user@domain.com> logon
>> credentials. Is there a way to configure OpenLDAP to authenticate in
>> this way? Slapd config file available on request.
> 
> Simple LDAP Bind with userPrincipalName instead of a Bind-DN is a AD-specific
> thing. You have to fix your client apps.
> 
> Ciao, Michael.