On 7/17/23 10:58, Timothy Ward wrote:
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.

Robert can also probably ignore the comment about "CGI Environment Variables" because all that is handled by the Servlet Container (Tomcat) by placing the certificate and chain under this request attribute key:


Robert, if you read the Servlet API (it's not awful! I promise!) you'll see what other things get put in there when client-certs are in use.

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
    HttpServletRequest req = (HttpServletRequest) request;
    //MutableHttpServletRequest mutableRequest = new

    X509Certificate[] certs = (X509Certificate[])


I would highly recommend some null-checking in here /just in case/ but this is basically what you (Robert) are looking for.

    //chain.doFilter(mutableRequest, response);

  @Override public void init(FilterConfig filterConfig) throws


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

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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