1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements. See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership. The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License. You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied. See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.ws.security.common;
21  
22  import org.apache.ws.security.WSPasswordCallback;
23  import org.apache.ws.security.WSSecurityException;
24  import org.apache.ws.security.util.Base64;
25  import org.apache.ws.security.util.WSSecurityUtil;
26  
27  import javax.security.auth.callback.Callback;
28  import javax.security.auth.callback.CallbackHandler;
29  import javax.security.auth.callback.UnsupportedCallbackException;
30  import java.io.IOException;
31  import java.util.HashMap;
32  import java.util.Map;
33  
34  /**
35   * A Callback Handler implementation for the case of storing a secret key.
36   */
37  public class SecretKeyCallbackHandler implements CallbackHandler {
38      
39      private Map<String, byte[]> secrets = new HashMap<String, byte[]>();
40      private byte[] outboundSecret = null;
41      
42      public void handle(Callback[] callbacks)
43          throws IOException, UnsupportedCallbackException {
44          for (int i = 0; i < callbacks.length; i++) {
45              if (callbacks[i] instanceof WSPasswordCallback) {
46                  WSPasswordCallback pc = (WSPasswordCallback) callbacks[i];
47                  switch (pc.getUsage()) {
48                  case WSPasswordCallback.SECRET_KEY:
49                  case WSPasswordCallback.SECURITY_CONTEXT_TOKEN: {
50                      byte[] secret = (byte[]) this.secrets.get(pc.getIdentifier());
51                      if (secret == null) {
52                          secret = outboundSecret;
53                      }
54                      pc.setKey(secret);
55                      break;
56                  }
57                  }
58              } else {
59                  throw new UnsupportedCallbackException(callbacks[i], "Unrecognized Callback");
60              }
61          }
62      }
63      
64      public void addSecretKey(String identifier, byte[] secretKey) {
65          secrets.put(identifier, secretKey);
66      }
67      
68      public void setOutboundSecret(byte[] secret) throws WSSecurityException {
69          outboundSecret = secret;
70          byte[] encodedBytes = WSSecurityUtil.generateDigest(outboundSecret);
71          String identifier = Base64.encode(encodedBytes);
72          addSecretKey(identifier, outboundSecret);
73      }
74  }