Emmanuel Lecharny <elecharny@gmail.com> wrote on 11/10/2010 11:43:11 AM:

> On 11/10/10 5:11 PM, feezelr@gdls.com wrote:
> > I have been exploring the possibility of using the ApacheDS Kerberos
> > implementation in another application in which the backing store would not
> > be an LDAP server.  There seem to be a number of areas in which the
> > Kerberos modules are entangled with the LDAP code.  One area of particular
> > note is Kerberos' use of the ASN1 packages in "shared-ldap".  As a test I
> > created a "shared-asn1" module containing all the ASN1 packages but none
> > of the LDAP packages.  The module satisfied all of Kerberos' needs and the
> > jar file was only 81Kb whereas the shared-ldap jar file is over 1500 Kb.
> > So I'm asking the developer's opinion regarding separating the ASN1
> > packages from shared-ldap and created a "shared-asn1" module.  The
> > relatively small size of such a module wouldn't seem to be a concern as
> > there are other modules, such as dsml-engine at only 14.5 Kb.  I assume
> > that the ASN1 packages were originally created for the LDAP message
> > parsing but they clearly have application in non-LDAP protocols as
> > evidenced by their use in the Kerberos implementation.

> LDAP asn.1 is using BER encoding, when Kerberos is using DER. Not really
> a big deal though, as we are encoding and decoding the PDU the same way.

The difference seems to elude me more often that I grasp it.

> FYI, we had a separate package shared-asn1 6 months earlier, and we
> decided to merge it into shared, just because it's a PITA to deal with
> many jars when building an application on top of shared (we have more
> than one : the server of course, but also the installers, Studio, the
> API, groovy-LDAP)

I thought that was what shared-all was for.  Then there is only one jar to include.  Perhaps I misunderstand.
> It's convenient.

It just seems inconsistent with the architectural philosophy.  Oh well...

> > I will be investigating the other LDAP code dependencies in the Kerberos
> > code as well.
> There are not too many.
> >
> > On another topic...  I raised the question some weeks ago about interest
> > in a RADIUS implementation.  Since then I have written one using Mina 2.0
> > and modelled loosely on ApacheDS Kerberos.  It was carefully crafted to be
> > independent of the information store implementation by including
> > definitions of a few Interfaces to be implemented by the instantiating
> > framework.  I have created implementations of the interfaces that use a
> > SQL DB as the store and hope to have it deployed in a real-world
> > environment for initial testing in the next few weeks.

> I'm just wondering if it would not be better to use the full stack,
> except that the Backend could be a SQL implementation. T

The framework I'm using for testing has other functions built on the SQL DB
so I don't have direct control of what the backend is, if that's what you mean
by the "full stack".  I expect that framework with my RADIUS in it to persist.
Due to my familiarity with it, and my lack of experience using LDAP, I was
inclined to integrate it there first.

> > Another pluggable aspect to the design is the use of request "Evaluators"
> > strung together using a "commons-chain" framework.  I have created request
> > evaluators for PAP, CHAP, and MS-CHAP authentication requests (all based
> > on the availability of the users' clear-text password, Proxy forwarding to
> > another RADIUS server based on the domain name in the User-Name attribute
> > of the request, and Accounting message processing.  I've also begun
> > creating the framework needed to handle EAP requests but it isn't
> > complete.  Also the Accounting evaluator currently only accepts or rejects
> > messages based on whether it can find the specified user in the data
> > store, but always discards the message content.  Clearly more is needed
> > here.
> >
> > I am planning to donate this RADIUS implementation to the Apache Directory
> > project if you're interested in incorporating it.

> Of course we are ! The question is : who will maintain it ? Are you
> going to be around ? If so, that would be a pleasure !

I expect to have a long-term relationship with this code so, yes I expect to be around to maintain it.

> > Obviously an
> > implementation of the data store interfaces which uses the ADS LDAP is
> > required in order for it to be useable within Apache Directory.

> That's a non issue at this point. We can work out a solution.

I know everyone is pretty busy and this is a distraction from the drive to get
a solid 2.0 version, especially given that it didn't seem to be on the radar
until I asked the question a few weeks ago.

> > Unfortunately I have no experience creating applications which make
> > extensive use of an LDAP store.  Some basic information about each NAS
> > (network access server) which are the "clients" of a RADIUS server is
> > needed.  Additionally, attributes which are to be incorporated into server
> > responses need to be associated with individual users, groups of users,
> > groups of NAS's, etc.  Since I've also never been a RADIUS server
> > administrator, my familiarity with configuration management is limited to
> > what I've read in the descriptions of other servers such as FreeRADIUS and
> > Microsoft IAS.  It is my understanding that making the decision-making as
> > to what attributes to included in a response is generally based on testing
> > of the attributes included in the request.  I have classes to support a
> > basic implementation of this idea though I'm not clear it is sufficient
> > for all uses.

> My Radius book is still in the bookshelf, I have to open it again (it
> was 3 years ago the last time I browse it) before I can bring some
> valuable insights atm...

I expect to have some light shed on this as we push to get a running deployment
in place.  I'll try to get the code more stabilized and perhaps write a more
thorough architectural description.  Asking you to wade into the code to try to
understand how it fits probably isn't the best approach.

> Anyway, sounds like a very good addition.

I thought it seemed to make sense for ADS.

> --
> Regards,
> Cordialement,
> Emmanuel Lécharny
> www.iktek.com
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