--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.security.jgss/share/classes/sun/security/krb5/internal/ssl/KerberosPreMasterSecret.java Tue Jun 02 22:26:36 2015 +0800
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2003, 2010, 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 sun.security.krb5.internal.ssl;
+
+import java.io.*;
+import java.security.*;
+import java.util.Arrays;
+
+import javax.net.ssl.*;
+
+import sun.security.krb5.EncryptionKey;
+import sun.security.krb5.EncryptedData;
+import sun.security.krb5.KrbException;
+import sun.security.krb5.internal.crypto.KeyUsage;
+
+import sun.security.ssl.Debug;
+import sun.security.ssl.HandshakeInStream;
+import sun.security.ssl.HandshakeMessage;
+import sun.security.ssl.ProtocolVersion;
+
+/**
+ * This is the Kerberos premaster secret in the Kerberos client key
+ * exchange message (CLIENT --> SERVER); it holds the
+ * Kerberos-encrypted pre-master secret. The secret is encrypted using the
+ * Kerberos session key. The padding and size of the resulting message
+ * depends on the session key type, but the pre-master secret is
+ * always exactly 48 bytes.
+ *
+ */
+final class KerberosPreMasterSecret {
+
+ private ProtocolVersion protocolVersion; // preMaster [0,1]
+ private byte preMaster[]; // 48 bytes
+ private byte encrypted[];
+
+ /**
+ * Constructor used by client to generate premaster secret.
+ *
+ * Client randomly creates a pre-master secret and encrypts it
+ * using the Kerberos session key; only the server can decrypt
+ * it, using the session key available in the service ticket.
+ *
+ * @param protocolVersion used to set preMaster[0,1]
+ * @param generator random number generator for generating premaster secret
+ * @param sessionKey Kerberos session key for encrypting premaster secret
+ */
+ KerberosPreMasterSecret(ProtocolVersion protocolVersion,
+ SecureRandom generator, EncryptionKey sessionKey) throws IOException {
+
+ if (sessionKey.getEType() ==
+ EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD) {
+ throw new IOException(
+ "session keys with des3-cbc-hmac-sha1-kd encryption type " +
+ "are not supported for TLS Kerberos cipher suites");
+ }
+
+ this.protocolVersion = protocolVersion;
+ preMaster = generatePreMaster(generator, protocolVersion);
+
+ // Encrypt premaster secret
+ try {
+ EncryptedData eData = new EncryptedData(sessionKey, preMaster,
+ KeyUsage.KU_UNKNOWN);
+ encrypted = eData.getBytes(); // not ASN.1 encoded.
+
+ } catch (KrbException e) {
+ throw (SSLKeyException)new SSLKeyException
+ ("Kerberos premaster secret error").initCause(e);
+ }
+ }
+
+ /*
+ * Constructor used by server to decrypt encrypted premaster secret.
+ * The protocol version in preMaster[0,1] must match either currentVersion
+ * or clientVersion, otherwise, the premaster secret is set to
+ * a random one to foil possible attack.
+ *
+ * @param currentVersion version of protocol being used
+ * @param clientVersion version requested by client
+ * @param generator random number generator used to generate
+ * bogus premaster secret if premaster secret verification fails
+ * @param input input stream from which to read the encrypted
+ * premaster secret
+ * @param sessionKey Kerberos session key to be used for decryption
+ */
+ KerberosPreMasterSecret(ProtocolVersion currentVersion,
+ ProtocolVersion clientVersion,
+ SecureRandom generator, byte[] encrypted,
+ EncryptionKey sessionKey) throws IOException {
+
+ if (HandshakeMessage.debug != null && Debug.isOn("handshake")) {
+ if (encrypted != null) {
+ Debug.println(System.out,
+ "encrypted premaster secret", encrypted);
+ }
+ }
+
+ if (sessionKey.getEType() ==
+ EncryptedData.ETYPE_DES3_CBC_HMAC_SHA1_KD) {
+ throw new IOException(
+ "session keys with des3-cbc-hmac-sha1-kd encryption type " +
+ "are not supported for TLS Kerberos cipher suites");
+ }
+
+ // Decrypt premaster secret
+ try {
+ EncryptedData data = new EncryptedData(sessionKey.getEType(),
+ null /* optional kvno */, encrypted);
+
+ byte[] temp = data.decrypt(sessionKey, KeyUsage.KU_UNKNOWN);
+ if (HandshakeMessage.debug != null && Debug.isOn("handshake")) {
+ if (encrypted != null) {
+ Debug.println(System.out,
+ "decrypted premaster secret", temp);
+ }
+ }
+
+ // Remove padding bytes after decryption. Only DES and DES3 have
+ // paddings and we don't support DES3 in TLS (see above)
+
+ if (temp.length == 52 &&
+ data.getEType() == EncryptedData.ETYPE_DES_CBC_CRC) {
+ // For des-cbc-crc, 4 paddings. Value can be 0x04 or 0x00.
+ if (paddingByteIs(temp, 52, (byte)4) ||
+ paddingByteIs(temp, 52, (byte)0)) {
+ temp = Arrays.copyOf(temp, 48);
+ }
+ } else if (temp.length == 56 &&
+ data.getEType() == EncryptedData.ETYPE_DES_CBC_MD5) {
+ // For des-cbc-md5, 8 paddings with 0x08, or no padding
+ if (paddingByteIs(temp, 56, (byte)8)) {
+ temp = Arrays.copyOf(temp, 48);
+ }
+ }
+
+ preMaster = temp;
+
+ protocolVersion = ProtocolVersion.valueOf(preMaster[0],
+ preMaster[1]);
+ if (HandshakeMessage.debug != null && Debug.isOn("handshake")) {
+ System.out.println("Kerberos PreMasterSecret version: "
+ + protocolVersion);
+ }
+ } catch (Exception e) {
+ // catch exception & process below
+ preMaster = null;
+ protocolVersion = currentVersion;
+ }
+
+ // check if the premaster secret version is ok
+ // the specification says that it must be the maximum version supported
+ // by the client from its ClientHello message. However, many
+ // old implementations send the negotiated version, so accept both
+ // for SSL v3.0 and TLS v1.0.
+ // NOTE that we may be comparing two unsupported version numbers in
+ // the second case, which is why we cannot use object references
+ // equality in this special case
+ boolean versionMismatch = (protocolVersion.v != clientVersion.v);
+
+ /*
+ * we never checked the client_version in server side
+ * for TLS v1.0 and SSL v3.0. For compatibility, we
+ * maintain this behavior.
+ */
+ if (versionMismatch && (clientVersion.v <= 0x0301)) {
+ versionMismatch = (protocolVersion.v != currentVersion.v);
+ }
+
+ /*
+ * Bogus decrypted ClientKeyExchange? If so, conjure a
+ * a random preMaster secret that will fail later during
+ * Finished message processing. This is a countermeasure against
+ * the "interactive RSA PKCS#1 encryption envelop attack" reported
+ * in June 1998. Preserving the executation path will
+ * mitigate timing attacks and force consistent error handling
+ * that will prevent an attacking client from differentiating
+ * different kinds of decrypted ClientKeyExchange bogosities.
+ */
+ if ((preMaster == null) || (preMaster.length != 48)
+ || versionMismatch) {
+ if (HandshakeMessage.debug != null && Debug.isOn("handshake")) {
+ System.out.println("Kerberos PreMasterSecret error, "
+ + "generating random secret");
+ if (preMaster != null) {
+ Debug.println(System.out, "Invalid secret", preMaster);
+ }
+ }
+
+ /*
+ * Randomize the preMaster secret with the
+ * ClientHello.client_version, as will produce invalid master
+ * secret to prevent the attacks.
+ */
+ preMaster = generatePreMaster(generator, clientVersion);
+ protocolVersion = clientVersion;
+ }
+ }
+
+ /**
+ * Checks if all paddings of data are b
+ * @param data the block with padding
+ * @param len length of data, >= 48
+ * @param b expected padding byte
+ */
+ private static boolean paddingByteIs(byte[] data, int len, byte b) {
+ for (int i=48; i<len; i++) {
+ if (data[i] != b) return false;
+ }
+ return true;
+ }
+
+ /*
+ * Used by server to generate premaster secret in case of
+ * problem decoding ticket.
+ *
+ * @param protocolVersion used for preMaster[0,1]
+ * @param generator random number generator to use for generating secret.
+ */
+ KerberosPreMasterSecret(ProtocolVersion protocolVersion,
+ SecureRandom generator) {
+
+ this.protocolVersion = protocolVersion;
+ preMaster = generatePreMaster(generator, protocolVersion);
+ }
+
+ private static byte[] generatePreMaster(SecureRandom rand,
+ ProtocolVersion ver) {
+
+ byte[] pm = new byte[48];
+ rand.nextBytes(pm);
+ pm[0] = ver.major;
+ pm[1] = ver.minor;
+
+ return pm;
+ }
+
+ // Clone not needed; internal use only
+ byte[] getUnencrypted() {
+ return preMaster;
+ }
+
+ // Clone not needed; internal use only
+ byte[] getEncrypted() {
+ return encrypted;
+ }
+}