--- a/jdk/src/java.security.jgss/share/classes/sun/security/ssl/krb5/KerberosPreMasterSecret.java Thu Jun 11 00:23:01 2015 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,272 +0,0 @@
-/*
- * 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.ssl.krb5;
-
-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, HandshakeInStream input,
- EncryptionKey sessionKey) throws IOException {
-
- // Extract encrypted premaster secret from message
- encrypted = input.getBytes16();
-
- 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;
- }
-}