--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.security.sasl/share/classes/com/sun/security/sasl/CramMD5Server.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.security.sasl;
+
+import javax.security.sasl.*;
+import javax.security.auth.callback.*;
+import java.util.Random;
+import java.util.Map;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.security.NoSuchAlgorithmException;
+
+import java.util.logging.Level;
+
+/**
+ * Implements the CRAM-MD5 SASL server-side mechanism.
+ * (<A HREF="http://www.ietf.org/rfc/rfc2195.txt">RFC 2195</A>).
+ * CRAM-MD5 has no initial response.
+ *
+ * client <---- M={random, timestamp, server-fqdn} ------- server
+ * client ----- {username HMAC_MD5(pw, M)} --------------> server
+ *
+ * CallbackHandler must be able to handle the following callbacks:
+ * - NameCallback: default name is name of user for whom to get password
+ * - PasswordCallback: must fill in password; if empty, no pw
+ * - AuthorizeCallback: must setAuthorized() and canonicalized authorization id
+ * - auth id == authzid, but needed to get canonicalized authzid
+ *
+ * @author Rosanna Lee
+ */
+final class CramMD5Server extends CramMD5Base implements SaslServer {
+ private String fqdn;
+ private byte[] challengeData = null;
+ private String authzid;
+ private CallbackHandler cbh;
+
+ /**
+ * Creates a CRAM-MD5 SASL server.
+ *
+ * @param protocol ignored in CRAM-MD5
+ * @param serverFqdn non-null, used in generating a challenge
+ * @param props ignored in CRAM-MD5
+ * @param cbh find password, authorize user
+ */
+ CramMD5Server(String protocol, String serverFqdn, Map<String, ?> props,
+ CallbackHandler cbh) throws SaslException {
+ if (serverFqdn == null) {
+ throw new SaslException(
+ "CRAM-MD5: fully qualified server name must be specified");
+ }
+
+ fqdn = serverFqdn;
+ this.cbh = cbh;
+ }
+
+ /**
+ * Generates challenge based on response sent by client.
+ *
+ * CRAM-MD5 has no initial response.
+ * First call generates challenge.
+ * Second call verifies client response. If authentication fails, throws
+ * SaslException.
+ *
+ * @param responseData A non-null byte array containing the response
+ * data from the client.
+ * @return A non-null byte array containing the challenge to be sent to
+ * the client for the first call; null when 2nd call is successful.
+ * @throws SaslException If authentication fails.
+ */
+ public byte[] evaluateResponse(byte[] responseData)
+ throws SaslException {
+
+ // See if we've been here before
+ if (completed) {
+ throw new IllegalStateException(
+ "CRAM-MD5 authentication already completed");
+ }
+
+ if (aborted) {
+ throw new IllegalStateException(
+ "CRAM-MD5 authentication previously aborted due to error");
+ }
+
+ try {
+ if (challengeData == null) {
+ if (responseData.length != 0) {
+ aborted = true;
+ throw new SaslException(
+ "CRAM-MD5 does not expect any initial response");
+ }
+
+ // Generate challenge {random, timestamp, fqdn}
+ Random random = new Random();
+ long rand = random.nextLong();
+ long timestamp = System.currentTimeMillis();
+
+ StringBuilder sb = new StringBuilder();
+ sb.append('<');
+ sb.append(rand);
+ sb.append('.');
+ sb.append(timestamp);
+ sb.append('@');
+ sb.append(fqdn);
+ sb.append('>');
+ String challengeStr = sb.toString();
+
+ logger.log(Level.FINE,
+ "CRAMSRV01:Generated challenge: {0}", challengeStr);
+
+ challengeData = challengeStr.getBytes("UTF8");
+ return challengeData.clone();
+
+ } else {
+ // Examine response to see if correctly encrypted challengeData
+ if(logger.isLoggable(Level.FINE)) {
+ logger.log(Level.FINE,
+ "CRAMSRV02:Received response: {0}",
+ new String(responseData, "UTF8"));
+ }
+
+ // Extract username from response
+ int ulen = 0;
+ for (int i = 0; i < responseData.length; i++) {
+ if (responseData[i] == ' ') {
+ ulen = i;
+ break;
+ }
+ }
+ if (ulen == 0) {
+ aborted = true;
+ throw new SaslException(
+ "CRAM-MD5: Invalid response; space missing");
+ }
+ String username = new String(responseData, 0, ulen, "UTF8");
+
+ logger.log(Level.FINE,
+ "CRAMSRV03:Extracted username: {0}", username);
+
+ // Get user's password
+ NameCallback ncb =
+ new NameCallback("CRAM-MD5 authentication ID: ", username);
+ PasswordCallback pcb =
+ new PasswordCallback("CRAM-MD5 password: ", false);
+ cbh.handle(new Callback[]{ncb,pcb});
+ char pwChars[] = pcb.getPassword();
+ if (pwChars == null || pwChars.length == 0) {
+ // user has no password; OK to disclose to server
+ aborted = true;
+ throw new SaslException(
+ "CRAM-MD5: username not found: " + username);
+ }
+ pcb.clearPassword();
+ String pwStr = new String(pwChars);
+ for (int i = 0; i < pwChars.length; i++) {
+ pwChars[i] = 0;
+ }
+ pw = pwStr.getBytes("UTF8");
+
+ // Generate a keyed-MD5 digest from the user's password and
+ // original challenge.
+ String digest = HMAC_MD5(pw, challengeData);
+
+ logger.log(Level.FINE,
+ "CRAMSRV04:Expecting digest: {0}", digest);
+
+ // clear pw when we no longer need it
+ clearPassword();
+
+ // Check whether digest is as expected
+ byte [] expectedDigest = digest.getBytes("UTF8");
+ int digestLen = responseData.length - ulen - 1;
+ if (expectedDigest.length != digestLen) {
+ aborted = true;
+ throw new SaslException("Invalid response");
+ }
+ int j = 0;
+ for (int i = ulen + 1; i < responseData.length ; i++) {
+ if (expectedDigest[j++] != responseData[i]) {
+ aborted = true;
+ throw new SaslException("Invalid response");
+ }
+ }
+
+ // All checks out, use AuthorizeCallback to canonicalize name
+ AuthorizeCallback acb = new AuthorizeCallback(username, username);
+ cbh.handle(new Callback[]{acb});
+ if (acb.isAuthorized()) {
+ authzid = acb.getAuthorizedID();
+ } else {
+ // Not authorized
+ aborted = true;
+ throw new SaslException(
+ "CRAM-MD5: user not authorized: " + username);
+ }
+
+ logger.log(Level.FINE,
+ "CRAMSRV05:Authorization id: {0}", authzid);
+
+ completed = true;
+ return null;
+ }
+ } catch (UnsupportedEncodingException e) {
+ aborted = true;
+ throw new SaslException("UTF8 not available on platform", e);
+ } catch (NoSuchAlgorithmException e) {
+ aborted = true;
+ throw new SaslException("MD5 algorithm not available on platform", e);
+ } catch (UnsupportedCallbackException e) {
+ aborted = true;
+ throw new SaslException("CRAM-MD5 authentication failed", e);
+ } catch (SaslException e) {
+ throw e; // rethrow
+ } catch (IOException e) {
+ aborted = true;
+ throw new SaslException("CRAM-MD5 authentication failed", e);
+ }
+ }
+
+ public String getAuthorizationID() {
+ if (completed) {
+ return authzid;
+ } else {
+ throw new IllegalStateException(
+ "CRAM-MD5 authentication not completed");
+ }
+ }
+}