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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/javax/crypto/sasl/crammd5/CramMD5Server.java
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+/* CramMD5Server.java --
+ Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.javax.crypto.sasl.crammd5;
+
+import gnu.java.security.Registry;
+import gnu.java.security.util.Util;
+import gnu.javax.crypto.sasl.NoSuchUserException;
+import gnu.javax.crypto.sasl.ServerMechanism;
+
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.security.InvalidKeyException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.security.sasl.AuthenticationException;
+import javax.security.sasl.SaslException;
+import javax.security.sasl.SaslServer;
+
+/**
+ * The CRAM-MD5 SASL server-side mechanism.
+ */
+public class CramMD5Server
+ extends ServerMechanism
+ implements SaslServer
+{
+ private byte[] msgID;
+
+ public CramMD5Server()
+ {
+ super(Registry.SASL_CRAM_MD5_MECHANISM);
+ }
+
+ protected void initMechanism() throws SaslException
+ {
+ }
+
+ protected void resetMechanism() throws SaslException
+ {
+ }
+
+ public byte[] evaluateResponse(final byte[] response) throws SaslException
+ {
+ if (state == 0)
+ {
+ msgID = CramMD5Util.createMsgID();
+ state++;
+ return msgID;
+ }
+ final String responseStr = new String(response);
+ final int index = responseStr.lastIndexOf(" ");
+ final String username = responseStr.substring(0, index);
+ final byte[] responseDigest;
+ try
+ {
+ responseDigest = responseStr.substring(index + 1).getBytes("UTF-8");
+ }
+ catch (UnsupportedEncodingException x)
+ {
+ throw new AuthenticationException("evaluateResponse()", x);
+ }
+ // Look up the password
+ final char[] password = lookupPassword(username);
+ // Compute the digest
+ byte[] digest;
+ try
+ {
+ digest = CramMD5Util.createHMac(password, msgID);
+ }
+ catch (InvalidKeyException x)
+ {
+ throw new AuthenticationException("evaluateResponse()", x);
+ }
+ try
+ {
+ digest = Util.toString(digest).toLowerCase().getBytes("UTF-8");
+ }
+ catch (UnsupportedEncodingException x)
+ {
+ throw new AuthenticationException("evaluateResponse()", x);
+ }
+ // Compare the received and computed digests
+ if (! Arrays.equals(digest, responseDigest))
+ throw new AuthenticationException("Digest mismatch");
+ state++;
+ return null;
+ }
+
+ public boolean isComplete()
+ {
+ return (state == 2);
+ }
+
+ protected String getNegotiatedQOP()
+ {
+ return Registry.QOP_AUTH;
+ }
+
+ private char[] lookupPassword(final String userName) throws SaslException
+ {
+ try
+ {
+ if (! authenticator.contains(userName))
+ throw new NoSuchUserException(userName);
+ final Map userID = new HashMap();
+ userID.put(Registry.SASL_USERNAME, userName);
+ final Map credentials = authenticator.lookup(userID);
+ final String password = (String) credentials.get(Registry.SASL_PASSWORD);
+ if (password == null)
+ throw new AuthenticationException("lookupPassword()",
+ new InternalError());
+ return password.toCharArray();
+ }
+ catch (IOException x)
+ {
+ if (x instanceof SaslException)
+ throw (SaslException) x;
+ throw new AuthenticationException("lookupPassword()", x);
+ }
+ }
+}