Re: Client Certificates

[Timothy Ward]

Here is a filter that I am using to get the client certificates, the issue
I'm having is passing them along via the headers so they can be picked up
as CGI Environment Variables down the road.  This does get me the
certificate information though.  Just ignor the mutableRequest stuff as
that is what I was trying to use to put the information in the
RequestHeader, so there is another java file that does that.

import java.io.IOException;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.security.cert.Certificate;
import java.security.cert.X509Certificate;

//import MutableHttpServletRequest;

public class SecurityFilter implements javax.servlet.Filter
{
 @Override public void destroy()
 {
 }

 @Override public void doFilter(ServletRequest request, ServletResponse
response, FilterChain chain) throws IOException, ServletException
  {
   System.out.println("doFilter-Start.");
   HttpServletRequest req = (HttpServletRequest) request;
   //MutableHttpServletRequest mutableRequest = new
MutableHttpServletRequest(req);

   X509Certificate[] certs = (X509Certificate[])
req.getAttribute("javax.servlet.request.X509Certificate");


 
System.out.println("doFilter-SSL_CLIENT_S_DN="+certs[0].getSubjectX500Principal().getName());

 
System.out.println("doFilter-SSL_CERTIFICATES_FOUND="+Integer.toString(certs.length));
   //mutableRequest.putHeader("SSL_CLIENT_S_DN",
certs[0].getSubjectX500Principal().getName());
   //mutableRequest.putHeader("SSL_CERTIFICATES_FOUND",
Integer.toString(certs.length));
   //chain.doFilter(mutableRequest, response);
   System.out.println("doFilter-Done.");
  }

 @Override public void init(FilterConfig filterConfig) throws
ServletException
  {
  }
}

On Mon, Jul 17, 2023 at 10:38 AM Robert Egan <robert.e...@vsolvit.com>
wrote:

> I would like to write a filter that accesses a client certificate attached
> to the servlet request without using a proxy server. And after three weeks
> of searching, I'm beginning to feel like it is not possible. Because every
> article I've found assumes the request was forwarded from a proxy server.
>
> So my questions are: Is it even possible? If it is, can someone point me in
> the right direction? Also, if it is possible, but strongly discouraged for
> security reasons, let me know that as well. I am not adverse to using a
> proxy server, especially if it is considered a "best practice".
>
> Thanks in advance
> Robert Egan
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