RE: Sockets and client certificate -- RPG400-L

Scott,

I guess you've never had a B2B relationship with a partner that mandates 
something better than Basic Authentication. The partner would usually issue you 
with a client certificate to permit you to access their server. We had to 
develop web applications for a customer who is a national bank where they would 
not even permit their browser clients access without a trusted client 
certificate. I suspect it will become more common in this age of identity fraud.

For SSL connections that do not require a client certificate we have created 
RPGLE that binds to the SSL versions of the TCP sockets procedures. The entire 
code is not too verbose without even bothering to strip prototypes and methods 
into a service program. Although the SSL socket APIs prior to V5 required a 
reference to the certificate store containing the digital certificate used to 
encrypt the session, since then only the Application ID assigned by the DCM is 
necessary, just like in the IBM GSKit (which does seem verbose).

Not having seen any example of using a client cert in RPGLE it seemed as clear 
as mud how this might be achieved (even in the GSKit). However, I notice that 
there is a reference to a local certificate in a data structure which has been 
set to *null, maybe that's what I've missed.

The thing about embedding a cert in the header seemed a reasonable assumption 
since that's how  authentication appears to be prescribed by RFCs, which for me 
appear to make digital cert stuff look too hard compared with Basic 
Authentication.

If you figure you can prove how do it with GSKit then that would be nice to 
know.
We can always stick with the java classes that achieve this but, like you, I 
have a penchant for knowing how to do it in RPGLE. 

Peter    

-----Original Message-----
From: rpg400-l-bounces+peter.connell=baycorpadvantage.com@xxxxxxxxxxxx
[mailto:rpg400-l-bounces+peter.connell=baycorpadvantage.com@xxxxxxxxxxxx
]On Behalf Of Scott Klement
Sent: Saturday, October 25, 2003 10:08 AM
To: RPG programming on the AS400 / iSeries
Subject: Re: Sockets and client certificate



You need client certs in HTTP?  I've never heard of that requirement.

At any rate, client certs are part of SSL, not part of HTTP.  You don't
encode them in the HTTP header, but rather you put them in the SSL
handshake.

Although I haven't tested it, my HTTPAPI should already do that if you
assign a client certificate to the application in the digital certificate
manager.

Have you considered using HTTPAPI (or similar) solution instead of writing
the HTTP code yourself?

http://www.scottklement.com/httpapi/


On Sat, 25 Oct 2003, Peter Connell wrote:

> Using sockets in RPGLE to send an HTTP request to a remote HTTP server
> has long been standard fare. Using SSL sockets proved a little more
> difficult with much thanks to some sample RPGLE code from Barbara Morris
> a couple of years ago.
>
> It is also clear how to embed base64 encoded authentication details into
> the HTTP header for connection to sites that require Basic
> Authentication. But does anyone know how to accomodate a site that
> requires a client certificate for authentication. I did a brief google
> search for RFCs on this but they prove to be tiresome.
>
> I would like to think that it's as simple as knowing the correct HTTP
> directives to embed the header and then just copy in the client
> certificate directly from where it is stored on the IFS but that may be
> wishful thinking. It would be also be nice to be able to dump a
> communication trace for such a request but it is unfortunately
> unreadable since it is encrypted. I presume that would also be the case
> for some tool that might expose the header when using a browser to
> connect.
>
> Finding info on this stuff seems like looking for a needle in a haystack.
> Can anyone help?
>
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