Fuse ESB - Web Services Security Guide - Chapter 1. Security for HTTP-Compatible Bindings

Overview

This section describes how to configure the HTTP transport to use SSL/TLS security, a combination usually referred to as HTTPS. In Fuse Services Framework, HTTPS security is configured by specifying settings in XML configuration files.

The following topics are discussed in this chapter:

Generating X.509 certificates

A basic prerequisite for using SSL/TLS security is to have a collection of X.509 certificates available to identify your server applications and, optionally, to identify your client applications. You can generate X.509 certificates in one of the following ways:

Use a commercial third-party to tool to generate and manage your X.509 certificates.
Use the free openssl utility (which can be downloaded from http://www.openssl.org) and the Java keystore utility to generate certificates (see Use the CA to Create Signed Certificates in a Java Keystore).

	Note
	The HTTPS protocol mandates a URL integrity check, which requires a certificate’s identity to match the hostname on which the server is deployed. See Special Requirements on HTTPS Certificates for details.

Certificate format

In the Java runtime, you must deploy X.509 certificate chains and trusted CA certificates in the form of Java keystores. See Configuring HTTPS for details.

Enabling HTTPS

A prerequisite for enabling HTTPS on a WSDL endpoint is that the endpoint address must be specified as a HTTPS URL. There are two different locations where the endpoint address is set and both must be modified to use a HTTPS URL:

HTTPS specified in the WSDL contract—you must specify the endpoint address in the WSDL contract to be a URL with the https: prefix, as shown in Example 1.1.

Example 1.1. Specifying HTTPS in the WSDL

<wsdl:definitions name="HelloWorld"
                targetNamespace="http://apache.org/hello_world_soap_http"
                xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 
                xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" ... >
  ...
  <wsdl:service name="SOAPService">
    <wsdl:port binding="tns:Greeter_SOAPBinding"
               name="SoapPort">
      <soap:address location="https://localhost:9001/SoapContext/SoapPort"/>
    </wsdl:port>
  </wsdl:service>
</wsdl:definitions>

Where the location attribute of the soap:address element is configured to use a HTTPS URL. For bindings other than SOAP, you edit the URL appearing in the location attribute of the http:address element.

HTTPS specified in the server code—you must ensure that the URL published in the server code by calling Endpoint.publish() is defined with a https: prefix, as shown in Example 1.2.

Example 1.2. Specifying HTTPS in the Server Code

// Java
package demo.hw_https.server;
import javax.xml.ws.Endpoint;
                
public class Server {
  protected Server() throws Exception {
    Object implementor = new GreeterImpl();
    String address = "https://localhost:9001/SoapContext/SoapPort";
    Endpoint.publish(address, implementor);
  }
  ...
  }

HTTPS client with no certificate

For example, consider the configuration for a secure HTTPS client with no certificate, as shown in Example 1.3.

Example 1.3. Sample HTTPS Client with No Certificate

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:sec="http://cxf.apache.org/configuration/security"
       xmlns:http="http://cxf.apache.org/transports/http/configuration"
       xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
       xsi:schemaLocation="...">
                    
    <http:conduit name="{http://apache.org/hello_world_soap_http}SoapPort.http-conduit">
      <http:tlsClientParameters>
        <sec:trustManagers>
          <sec:keyStore type="JKS" password="password"
                        file="certs/truststore.jks"/>
        </sec:trustManagers>
        <sec:cipherSuitesFilter>
        <sec:include>.*_WITH_3DES_.*</sec:include>
        <sec:include>.*_WITH_DES_.*</sec:include>
        <sec:exclude>.*_WITH_NULL_.*</sec:exclude>
        <sec:exclude>.*_DH_anon_.*</sec:exclude>
      </sec:cipherSuitesFilter>
    </http:tlsClientParameters>
  </http:conduit>
  
</beans>

The preceding client configuration is described as follows:

The TLS security settings are defined on a specific WSDL port. In this example, the WSDL port being configured has the QName, {http://apache.org/hello_world_soap_http}SoapPort.

The http:tlsClientParameters element contains all of the client’s TLS configuration details.

The sec:trustManagers element is used to specify a list of trusted CA certificates (the client uses this list to decide whether or not to trust certificates received from the server side).

The file attribute of the sec:keyStore element specifies a Java keystore file, truststore.jks, containing one or more trusted CA certificates. The password attribute specifies the password required to access the keystore, truststore.jks. See Specifying Trusted CA Certificates for HTTPS.

	Note
	Instead of the `file` attribute, you can specify the location of the keystore using either the `resource` attribute or the `url` attribute. You must be extremely careful not to load the truststore from an untrustworthy source.

The sec:cipherSuitesFilter element can be used to narrow the choice of cipher suites that the client is willing to use for a TLS connection. See Configuring HTTPS Cipher Suites for details.

HTTPS client with certificate

Consider a secure HTTPS client that is configured to have its own certificate. Example 1.4 shows how to configure such a sample client.

Example 1.4. Sample HTTPS Client with Certificate

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:sec="http://cxf.apache.org/configuration/security"
 xmlns:http="http://cxf.apache.org/transports/http/configuration"
 xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
 xsi:schemaLocation="...">

  <http:conduit name="{http://apache.org/hello_world_soap_http}SoapPort.http-conduit">
    <http:tlsClientParameters>
      <sec:trustManagers>
          <sec:keyStore type="JKS" password="password"
               file="certs/truststore.jks"/>
      </sec:trustManagers>
      <sec:keyManagers keyPassword="password">
           <sec:keyStore type="JKS" password="password"
                file="certs/wibble.jks"/>
      </sec:keyManagers>
      <sec:cipherSuitesFilter>
        <sec:include>.*_WITH_3DES_.*</sec:include>
        <sec:include>.*_WITH_DES_.*</sec:include>
        <sec:exclude>.*_WITH_NULL_.*</sec:exclude>
        <sec:exclude>.*_DH_anon_.*</sec:exclude>
      </sec:cipherSuitesFilter>
    </http:tlsClientParameters>
   </http:conduit>
  
    <bean id="cxf" class="org.apache.cxf.bus.CXFBusImpl"/>
</beans>

The preceding client configuration is described as follows:

The sec:keyManagers element is used to attach an X.509 certificate and a private key to the client. The password specified by the keyPasswod attribute is used to decrypt the certificate’s private key.

The sec:keyStore element is used to specify an X.509 certificate and a private key that are stored in a Java keystore. This sample declares that the keystore is in Java Keystore format (JKS).

The file attribute specifies the location of the keystore file, wibble.jks, that contains the client’s X.509 certificate chain and private key in a key entry. The password attribute specifies the keystore password which is required to access the contents of the keystore. It is expected that the keystore file contains just one key entry, so it is not necessary to specify a key alias to identify the entry.

For details of how to create such a keystore file, see Use the CA to Create Signed Certificates in a Java Keystore.

	Note
	Instead of the `file` attribute, you can specify the location of the keystore using either the `resource` attribute or the `url` attribute. You must be extremely careful not to load the truststore from an untrustworthy source.

HTTPS server configuration

Consider a secure HTTPS server that requires clients to present an X.509 certificate. Example 1.5 shows how to configure such a server.

Example 1.5. Sample HTTPS Server Configuration

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:sec="http://cxf.apache.org/configuration/security"
xmlns:http="http://cxf.apache.org/transports/http/configuration"
xmlns:httpj="http://cxf.apache.org/transports/http-jetty/configuration"
xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
xsi:schemaLocation="...">

  <httpj:engine-factory bus="cxf">
   <httpj:engine port="9001">
    <httpj:tlsServerParameters>
      <sec:keyManagers keyPassword="password">
           <sec:keyStore type="JKS" password="password" 
                file="certs/cherry.jks"/>
      </sec:keyManagers>
      <sec:trustManagers>
          <sec:keyStore type="JKS" password="password"
               file="certs/truststore.jks"/>
      </sec:trustManagers>
      <sec:cipherSuitesFilter>
        <sec:include>.*_WITH_3DES_.*</sec:include>
        <sec:include>.*_WITH_DES_.*</sec:include>
        <sec:exclude>.*_WITH_NULL_.*</sec:exclude>
        <sec:exclude>.*_DH_anon_.*</sec:exclude>
      </sec:cipherSuitesFilter>
      <sec:clientAuthentication want="true" required="true"/>
    </httpj:tlsServerParameters>
   </httpj:engine>
  </httpj:engine-factory>
  
  <!-- We need a bean named "cxf" -->
  <bean id="cxf" class="org.apache.cxf.bus.CXFBusImpl"/>
</beans>

The preceding server configuration is described as follows:

On the server side, TLS is not configured for each WSDL port. Instead of configuring each WSDL port, the TLS security settings are applied to a specific IP port, which is 9001 in this example. All of the WSDL ports that share this IP port are therefore configured with the same TLS security settings.

The http:tlsServerParameters element contains all of the server’s TLS configuration details.

The sec:keyManagers element is used to attach an X.509 certificate and a private key to the server. The password specified by the keyPasswod attribute is used to decrypt the certificate’s private key.

The sec:keyStore element is used to specify an X.509 certificate and a private key that are stored in a Java keystore. This sample declares that the keystore is in Java Keystore format (JKS).

The file attribute specifies the location of the keystore file, cherry.jks, that contains the client’s X.509 certificate chain and private key in a key entry. The password attribute specifies the keystore password, which is needed to access the contents of the keystore. It is expected that the keystore file contains just one key entry, so there is no need to specify a key alias.

	Note
	Instead of the `file` attribute, you can specify the location of the keystore using either the `resource` attribute or the `url` attribute. You must be extremely careful not to load the truststore from an untrustworthy source.

For details of how to create such a keystore file, see Use the CA to Create Signed Certificates in a Java Keystore.

The sec:trustManagers element is used to specify a list of trusted CA certificates (the server uses this list to decide whether or not to trust certificates presented by clients).

The file attribute of the sec:keyStore element specifies a Java keystore file, truststore.jks, containing one or more trusted CA certificates. The password attribute specifies the password required to access the keystore, truststore.jks. See Specifying Trusted CA Certificates for HTTPS.

	Note
	Instead of the `file` attribute, you can specify the location of the keystore using either the `resource` attribute or the `url` attribute.

The sec:cipherSuitesFilter element can be used to narrow the choice of cipher suites that the server is willing to use for a TLS connection. See Configuring HTTPS Cipher Suites for details.

The sec:clientAuthentication element determines the server’s disposition towards the presentation of client certificates. The element has the following attributes:

want attribute—If true (the default), the server requests the client to present an X.509 certificate during the TLS handshake; if false, the server does not request the client to present an X.509 certificate.
required attribute—If true, the server raises an exception if a client fails to present an X.509 certificate during the TLS handshake; if false (the default), the server does not raise an exception if the client fails to present an X.509 certificate.