| /* |
| * Copyright (c) 1996, 2007, 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; |
| |
| import java.io.*; |
| import java.security.*; |
| import java.security.interfaces.*; |
| |
| import javax.crypto.*; |
| import javax.crypto.spec.*; |
| |
| import javax.net.ssl.*; |
| |
| import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec; |
| |
| /** |
| * This is the client key exchange message (CLIENT --> SERVER) used with |
| * all RSA key exchanges; it holds the RSA-encrypted pre-master secret. |
| * |
| * The message is encrypted using PKCS #1 block type 02 encryption with the |
| * server's public key. The padding and resulting message size is a function |
| * of this server's public key modulus size, but the pre-master secret is |
| * always exactly 48 bytes. |
| * |
| */ |
| final class RSAClientKeyExchange extends HandshakeMessage { |
| |
| /** |
| * The TLS spec says that the version in the RSA premaster secret must |
| * be the maximum version supported by the client (i.e. the version it |
| * requested in its client hello version). However, we (and other |
| * implementations) used to send the active negotiated version. The |
| * system property below allows to toggle the behavior. |
| * |
| * Default is "false" (old behavior) for compatibility reasons. This |
| * will be changed in the future. |
| */ |
| private final static String PROP_NAME = |
| "com.sun.net.ssl.rsaPreMasterSecretFix"; |
| |
| private final static boolean rsaPreMasterSecretFix = |
| Debug.getBooleanProperty(PROP_NAME, false); |
| |
| int messageType() { |
| return ht_client_key_exchange; |
| } |
| |
| /* |
| * The following field values were encrypted with the server's public |
| * key (or temp key from server key exchange msg) and are presented |
| * here in DECRYPTED form. |
| */ |
| private ProtocolVersion protocolVersion; // preMaster [0,1] |
| SecretKey preMaster; |
| private byte[] encrypted; // same size as public modulus |
| |
| |
| /* |
| * Client randomly creates a pre-master secret and encrypts it |
| * using the server's RSA public key; only the server can decrypt |
| * it, using its RSA private key. Result is the same size as the |
| * server's public key, and uses PKCS #1 block format 02. |
| */ |
| RSAClientKeyExchange(ProtocolVersion protocolVersion, ProtocolVersion maxVersion, |
| SecureRandom generator, PublicKey publicKey) throws IOException { |
| if (publicKey.getAlgorithm().equals("RSA") == false) { |
| throw new SSLKeyException("Public key not of type RSA"); |
| } |
| this.protocolVersion = protocolVersion; |
| |
| int major, minor; |
| |
| if (rsaPreMasterSecretFix) { |
| major = maxVersion.major; |
| minor = maxVersion.minor; |
| } else { |
| major = protocolVersion.major; |
| minor = protocolVersion.minor; |
| } |
| |
| try { |
| KeyGenerator kg = JsseJce.getKeyGenerator("SunTlsRsaPremasterSecret"); |
| kg.init(new TlsRsaPremasterSecretParameterSpec(major, minor)); |
| preMaster = kg.generateKey(); |
| |
| Cipher cipher = JsseJce.getCipher(JsseJce.CIPHER_RSA_PKCS1); |
| cipher.init(Cipher.WRAP_MODE, publicKey, generator); |
| encrypted = cipher.wrap(preMaster); |
| } catch (GeneralSecurityException e) { |
| throw (SSLKeyException)new SSLKeyException |
| ("RSA premaster secret error").initCause(e); |
| } |
| } |
| |
| /* |
| * Server gets the PKCS #1 (block format 02) data, decrypts |
| * it with its private key. |
| */ |
| RSAClientKeyExchange(ProtocolVersion currentVersion, HandshakeInStream input, |
| int messageSize, PrivateKey privateKey) throws IOException { |
| |
| if (privateKey.getAlgorithm().equals("RSA") == false) { |
| throw new SSLKeyException("Private key not of type RSA"); |
| } |
| |
| this.protocolVersion = currentVersion; |
| if (currentVersion.v >= ProtocolVersion.TLS10.v) { |
| encrypted = input.getBytes16(); |
| } else { |
| encrypted = new byte [messageSize]; |
| if (input.read(encrypted) != messageSize) { |
| throw new SSLProtocolException |
| ("SSL: read PreMasterSecret: short read"); |
| } |
| } |
| |
| try { |
| Cipher cipher = JsseJce.getCipher(JsseJce.CIPHER_RSA_PKCS1); |
| cipher.init(Cipher.UNWRAP_MODE, privateKey); |
| preMaster = (SecretKey)cipher.unwrap(encrypted, |
| "TlsRsaPremasterSecret", Cipher.SECRET_KEY); |
| } catch (Exception e) { |
| /* |
| * 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 (debug != null && Debug.isOn("handshake")) { |
| System.out.println("Error decrypting premaster secret:"); |
| e.printStackTrace(System.out); |
| System.out.println("Generating random secret"); |
| } |
| preMaster = generateDummySecret(currentVersion); |
| } |
| } |
| |
| // generate a premaster secret with the specified version number |
| static SecretKey generateDummySecret(ProtocolVersion version) { |
| try { |
| KeyGenerator kg = |
| JsseJce.getKeyGenerator("SunTlsRsaPremasterSecret"); |
| kg.init(new TlsRsaPremasterSecretParameterSpec |
| (version.major, version.minor)); |
| return kg.generateKey(); |
| } catch (GeneralSecurityException e) { |
| throw new RuntimeException("Could not generate dummy secret", e); |
| } |
| } |
| |
| int messageLength() { |
| if (protocolVersion.v >= ProtocolVersion.TLS10.v) { |
| return encrypted.length + 2; |
| } else { |
| return encrypted.length; |
| } |
| } |
| |
| void send(HandshakeOutStream s) throws IOException { |
| if (protocolVersion.v >= ProtocolVersion.TLS10.v) { |
| s.putBytes16(encrypted); |
| } else { |
| s.write(encrypted); |
| } |
| } |
| |
| void print(PrintStream s) throws IOException { |
| s.println("*** ClientKeyExchange, RSA PreMasterSecret, " + protocolVersion); |
| } |
| } |