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1 package org.columba.ristretto.auth.mechanism;
2
3 import java.io.IOException  ;
4 import java.util.Hashtable ;
5 import java.util.logging.Logger ;
6
7 import javax.security.auth.callback.Callback ;
8 import javax.security.auth.callback.CallbackHandler ;
9 import javax.security.auth.callback.NameCallback ;
10 import javax.security.auth.callback.PasswordCallback ;
11 import javax.security.auth.callback.TextOutputCallback ;
12 import javax.security.auth.callback.UnsupportedCallbackException ;
13
14 import org.columba.ristretto.auth.AuthenticationException;
15 import org.columba.ristretto.auth.AuthenticationMechanism;
16 import org.columba.ristretto.auth.AuthenticationServer;
17
18 public class CramMD5Mechanism implements AuthenticationMechanism, CallbackHandler {
19
20
21 private static final Logger LOG = Logger.getLogger("org.columba.ristretto.auth.mechanism");
22
23 private String username;
24 private char[] password;
25
26 SaslWrapper sasl;
27
28
29
32 public void authenticate(AuthenticationServer server, String user,
33 char[] password) throws IOException , AuthenticationException {
34
35 this.username = user;
36 this.password = password;
37 try {
38 sasl = new SaslWrapper();
39 sasl.createClient(new String []{"CRAM-MD5"},
40 user, server.getService(), server.getHostName(),
41 new Hashtable (), this);
42 byte[] serverChallenge = server.authReceive();
43 LOG.fine(new String (serverChallenge));
44
45 byte[] response = sasl.evaluateChallenge(serverChallenge);
46 LOG.fine(new String (response));
47 server.authSend(response);
48 } catch (Exception e) {
49 if( e.getCause() instanceof IOException ) throw (IOException )e.getCause();
50 else throw new AuthenticationException(e.getCause());
51 }
52 }
53
54
57 public void handle(Callback [] callbacks) throws IOException , UnsupportedCallbackException {
58 for (int i = 0; i < callbacks.length; i++) {
59 if (callbacks[i] instanceof TextOutputCallback ) {
60 TextOutputCallback toc = (TextOutputCallback ) callbacks[i];
62 switch (toc.getMessageType()) {
63 case TextOutputCallback.INFORMATION :
64 LOG.info(toc.getMessage());
65 break;
66 case TextOutputCallback.ERROR :
67 LOG.severe(toc.getMessage());
68 break;
69 case TextOutputCallback.WARNING :
70 LOG.warning(toc.getMessage());
71 break;
72 default :
73 LOG.fine(toc.getMessage());
74 }
75 } else if (callbacks[i] instanceof NameCallback ) {
76 NameCallback nc = (NameCallback ) callbacks[i];
77 nc.setName(username);
78 } else if (callbacks[i] instanceof PasswordCallback ) {
79 PasswordCallback pc = (PasswordCallback ) callbacks[i];
80 pc.setPassword(password);
81 } else if (sasl.handle(callbacks[i]) ) {
82 } else {
83 throw new UnsupportedCallbackException (callbacks[i],
84 "Unrecognized Callback");
85 }
86 }
87 }
88
89 }
90 |
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