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   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
 package org.apache.catalina.valves;
When using mod_proxy_http, the client SSL information is not included in the protocol (unlike mod_jk and mod_proxy_ajp). To make the client SSL information available to Tomcat, some additional configuration is required. In httpd, mod_headers is used to add the SSL information as HTTP headers. In Tomcat, this valve is used to read the information from the HTTP headers and insert it into the request.

Note: Ensure that the headers are always set by httpd for all requests to prevent a client spoofing SSL information by sending fake headers.

In httpd.conf add the following:

 <IfModule ssl_module>
   RequestHeader set SSL_CLIENT_CERT "%{SSL_CLIENT_CERT}s"
   RequestHeader set SSL_CIPHER "%{SSL_CIPHER}s"
   RequestHeader set SSL_SESSION_ID "%{SSL_SESSION_ID}s"
In server.xml, configure this valve under the Engine element in server.xml:
 <Engine ...>
   <Valve className="org.apache.catalina.valves.SSLValve" />
   <Host ... />
 public class SSLValve extends ValveBase {
     //------------------------------------------------------ Constructor
     public SSLValve() {
     public String mygetHeader(Request requestString header) {
         String strcert0 = request.getHeader(header);
         if (strcert0 == null) {
             return null;
         /* mod_header writes "(null)" when the ssl variable is no filled */
         if ("(null)".equals(strcert0)) {
             return null;
         return strcert0;
     public void invoke(Request requestResponse response)
         throws IOExceptionServletException {
         /* mod_header converts the '\n' into ' ' so we have to rebuild the client certificate */
         String strcert0 = mygetHeader(request"ssl_client_cert");
         if (strcert0 != null && strcert0.length()>28) {
             String strcert1 = strcert0.replace(' ''\n');
             String strcert2 = strcert1.substring(28, strcert1.length()-26);
             String strcert3 = "-----BEGIN CERTIFICATE-----\n";
             String strcert4 = strcert3.concat(strcert2);
             String strcerts = strcert4.concat("\n-----END CERTIFICATE-----\n");
             ByteArrayInputStream bais = new ByteArrayInputStream(strcerts.getBytes(.));
             X509Certificate jsseCerts[] = null;
             String providerName = (Stringrequest.getConnector().getProperty(
             try {
                 CertificateFactory cf;
                 if (providerName == null) {
                     cf = CertificateFactory.getInstance("X.509");
                } else {
                    cf = CertificateFactory.getInstance("X.509"providerName);
                X509Certificate cert = (X509Certificatecf.generateCertificate(bais);
                jsseCerts = new X509Certificate[1];
                jsseCerts[0] = cert;
            } catch ( e) {
            } catch (NoSuchProviderException e) {
        strcert0 = mygetHeader(request"ssl_cipher");
        if (strcert0 != null) {
        strcert0 = mygetHeader(request"ssl_session_id");
        if (strcert0 != null) {
        strcert0 = mygetHeader(request"ssl_cipher_usekeysize");
        if (strcert0 != null) {
            request.setAttribute(., Integer.valueOf(strcert0));
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