001 /*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements. See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership. The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License. You may obtain a copy of the License at
010 *
011 * http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied. See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 *
020 */
021 package org.apache.qpid.server.security.auth.sasl.plain;
022
023 import java.io.IOException;
024
025 import javax.security.auth.callback.Callback;
026 import javax.security.auth.callback.CallbackHandler;
027 import javax.security.auth.callback.NameCallback;
028 import javax.security.auth.callback.PasswordCallback;
029 import javax.security.auth.callback.UnsupportedCallbackException;
030 import javax.security.sasl.AuthorizeCallback;
031 import javax.security.sasl.SaslException;
032 import javax.security.sasl.SaslServer;
033
034 public class PlainSaslServer implements SaslServer
035 {
036 public static final String MECHANISM = "PLAIN";
037
038 private CallbackHandler _cbh;
039
040 private String _authorizationId;
041
042 private boolean _complete = false;
043
044 public PlainSaslServer(CallbackHandler cbh)
045 {
046 _cbh = cbh;
047 }
048
049 public String getMechanismName()
050 {
051 return MECHANISM;
052 }
053
054 public byte[] evaluateResponse(byte[] response) throws SaslException
055 {
056 try
057 {
058 int authzidNullPosition = findNullPosition(response, 0);
059 if (authzidNullPosition < 0)
060 {
061 throw new SaslException("Invalid PLAIN encoding, authzid null terminator not found");
062 }
063 int authcidNullPosition = findNullPosition(response, authzidNullPosition + 1);
064 if (authcidNullPosition < 0)
065 {
066 throw new SaslException("Invalid PLAIN encoding, authcid null terminator not found");
067 }
068
069 // we do not currently support authcid in any meaningful way
070 // String authcid = new String(response, 0, authzidNullPosition, "utf8");
071 String authzid = new String(response, authzidNullPosition + 1, authcidNullPosition - 1, "utf8");
072
073 // we do not care about the prompt but it throws if null
074 NameCallback nameCb = new NameCallback("prompt", authzid);
075 PasswordCallback passwordCb = new PasswordCallback("prompt", false);
076 // TODO: should not get pwd as a String but as a char array...
077 int passwordLen = response.length - authcidNullPosition - 1;
078 String pwd = new String(response, authcidNullPosition + 1, passwordLen, "utf8");
079 AuthorizeCallback authzCb = new AuthorizeCallback(authzid, authzid);
080 Callback[] callbacks = new Callback[]{nameCb, passwordCb, authzCb};
081 _cbh.handle(callbacks);
082 String storedPwd = new String(passwordCb.getPassword());
083 if (storedPwd.equals(pwd))
084 {
085 _complete = true;
086 }
087 if (authzCb.isAuthorized() && _complete)
088 {
089 _authorizationId = authzCb.getAuthenticationID();
090 return null;
091 }
092 else
093 {
094 throw new SaslException("Authentication failed");
095 }
096 }
097 catch (IOException e)
098 {
099 throw new SaslException("Error processing data: " + e, e);
100 }
101 catch (UnsupportedCallbackException e)
102 {
103 throw new SaslException("Unable to obtain data from callback handler: " + e, e);
104 }
105 }
106
107 private int findNullPosition(byte[] response, int startPosition)
108 {
109 int position = startPosition;
110 while (position < response.length)
111 {
112 if (response[position] == (byte) 0)
113 {
114 return position;
115 }
116 position++;
117 }
118 return -1;
119 }
120
121 public boolean isComplete()
122 {
123 return _complete;
124 }
125
126 public String getAuthorizationID()
127 {
128 return _authorizationId;
129 }
130
131 public byte[] unwrap(byte[] incoming, int offset, int len) throws SaslException
132 {
133 throw new SaslException("Unsupported operation");
134 }
135
136 public byte[] wrap(byte[] outgoing, int offset, int len) throws SaslException
137 {
138 throw new SaslException("Unsupported operation");
139 }
140
141 public Object getNegotiatedProperty(String propName)
142 {
143 return null;
144 }
145
146 public void dispose() throws SaslException
147 {
148 _cbh = null;
149 }
150
151 }
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