I suspect the problem is occurring before I can see the certificate,
because the only way the request even reaches my filter is when the
is set to auth="none".
I have been pulled away from this project for now, but thanks for the
answers.
Robert Egan
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On Mon, Jul 17, 2023 at 3:45 PM Christopher Schultz <
ch...@christopherschultz.net> wrote:
> Tim,
>
> 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:
>
> javax.servlet.request.X509Certificate
>
> 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
> >{
> > 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());
>
> I would highly recommend some null-checking in here /just in case/ but
> this is basically what you (Robert) are looking for.
>
> >
>
> 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
> >{
> >}
> > }
>
> -chris
>
> > On Mon, Jul 17, 2023 at 10:38 AM Robert Egan
> > 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.
> >>
