SSLValve.java
/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchProviderException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import javax.servlet.ServletException;
import org.apache.catalina.Globals;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.buf.UDecoder;
/**
* 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.
* <p>
* <b>Note: Ensure that the headers are always set by httpd for all requests to prevent a client spoofing SSL
* information by sending fake headers. </b>
* <p>
* In httpd.conf add the following:
*
* <pre>
* <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"
* RequestHeader set SSL_CIPHER_USEKEYSIZE "%{SSL_CIPHER_USEKEYSIZE}s"
* </IfModule>
* </pre>
*
* In server.xml, configure this valve under the Engine element in server.xml:
*
* <pre>
* <Engine ...>
* <Valve className="org.apache.catalina.valves.SSLValve" />
* <Host ... />
* </Engine>
* </pre>
*/
public class SSLValve extends ValveBase {
private static final Log log = LogFactory.getLog(SSLValve.class);
private String sslClientCertHeader = "ssl_client_cert";
private String sslClientEscapedCertHeader = "ssl_client_escaped_cert";
private String sslCipherHeader = "ssl_cipher";
private String sslSessionIdHeader = "ssl_session_id";
private String sslCipherUserKeySizeHeader = "ssl_cipher_usekeysize";
// ------------------------------------------------------ Constructor
public SSLValve() {
super(true);
}
public String getSslClientCertHeader() {
return sslClientCertHeader;
}
public void setSslClientCertHeader(String sslClientCertHeader) {
this.sslClientCertHeader = sslClientCertHeader;
}
public String getSslClientEscapedCertHeader() {
return sslClientEscapedCertHeader;
}
public void setSslClientEscapedCertHeader(String sslClientEscapedCertHeader) {
this.sslClientEscapedCertHeader = sslClientEscapedCertHeader;
}
public String getSslCipherHeader() {
return sslCipherHeader;
}
public void setSslCipherHeader(String sslCipherHeader) {
this.sslCipherHeader = sslCipherHeader;
}
public String getSslSessionIdHeader() {
return sslSessionIdHeader;
}
public void setSslSessionIdHeader(String sslSessionIdHeader) {
this.sslSessionIdHeader = sslSessionIdHeader;
}
public String getSslCipherUserKeySizeHeader() {
return sslCipherUserKeySizeHeader;
}
public void setSslCipherUserKeySizeHeader(String sslCipherUserKeySizeHeader) {
this.sslCipherUserKeySizeHeader = sslCipherUserKeySizeHeader;
}
public String mygetHeader(Request request, String 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;
}
@Override
public void invoke(Request request, Response response) throws IOException, ServletException {
/*
* Known behaviours of reverse proxies that are handled by the processing below: - mod_header converts the '\n'
* into ' ' - nginx converts the '\n' into multiple ' ' - nginx ssl_client_escaped_cert uses "uri component"
* escaping, keeping only ALPHA, DIGIT, "-", ".", "_", "~"
*
* The code assumes that the trimmed header value starts with '-----BEGIN CERTIFICATE-----' and ends with
* '-----END CERTIFICATE-----'.
*
* Note: For Java 7, the the BEGIN and END markers must be on separate lines as must each of the original
* content lines. The CertificateFactory is tolerant of any additional whitespace such as leading and trailing
* spaces and new lines as long as they do not appear in the middle of an original content line.
*/
String headerValue;
String headerEscapedValue = mygetHeader(request, sslClientEscapedCertHeader);
if (headerEscapedValue != null) {
headerValue = UDecoder.URLDecode(headerEscapedValue, StandardCharsets.ISO_8859_1);
} else {
headerValue = mygetHeader(request, sslClientCertHeader);
}
if (headerValue != null) {
headerValue = headerValue.trim();
if (headerValue.length() > 27) {
String body = headerValue.substring(27, headerValue.length() - 25);
body = body.replace(' ', '\n');
body = body.replace('\t', '\n');
String header = "-----BEGIN CERTIFICATE-----\n";
String footer = "\n-----END CERTIFICATE-----\n";
String strcerts = header.concat(body).concat(footer);
ByteArrayInputStream bais = new ByteArrayInputStream(strcerts.getBytes(StandardCharsets.ISO_8859_1));
X509Certificate jsseCerts[] = null;
String providerName = (String) request.getConnector().getProperty("clientCertProvider");
try {
CertificateFactory cf;
if (providerName == null) {
cf = CertificateFactory.getInstance("X.509");
} else {
cf = CertificateFactory.getInstance("X.509", providerName);
}
X509Certificate cert = (X509Certificate) cf.generateCertificate(bais);
jsseCerts = new X509Certificate[1];
jsseCerts[0] = cert;
} catch (java.security.cert.CertificateException e) {
log.warn(sm.getString("sslValve.certError", strcerts), e);
} catch (NoSuchProviderException e) {
log.error(sm.getString("sslValve.invalidProvider", providerName), e);
}
request.setAttribute(Globals.CERTIFICATES_ATTR, jsseCerts);
}
}
headerValue = mygetHeader(request, sslCipherHeader);
if (headerValue != null) {
request.setAttribute(Globals.CIPHER_SUITE_ATTR, headerValue);
}
headerValue = mygetHeader(request, sslSessionIdHeader);
if (headerValue != null) {
request.setAttribute(Globals.SSL_SESSION_ID_ATTR, headerValue);
}
headerValue = mygetHeader(request, sslCipherUserKeySizeHeader);
if (headerValue != null) {
request.setAttribute(Globals.KEY_SIZE_ATTR, Integer.valueOf(headerValue));
}
getNext().invoke(request, response);
}
}