| /* |
| * Copyright (c) 1996, 2016, 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 javax.crypto.*; |
| |
| import javax.net.ssl.*; |
| |
| import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec; |
| import sun.security.util.KeyUtil; |
| |
| /** |
| * 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 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. |
| */ |
| @SuppressWarnings("deprecation") |
| 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: " + |
| publicKey.getAlgorithm()); |
| } |
| this.protocolVersion = protocolVersion; |
| |
| try { |
| String s = protocolVersion.useTLS12PlusSpec() ? |
| "SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret"; |
| KeyGenerator kg = JsseJce.getKeyGenerator(s); |
| kg.init(new TlsRsaPremasterSecretParameterSpec( |
| maxVersion.v, protocolVersion.v), generator); |
| 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); |
| } |
| } |
| |
| /* |
| * Retrieving the cipher's provider name for the debug purposes |
| * can throw an exception by itself. |
| */ |
| private static String safeProviderName(Cipher cipher) { |
| try { |
| return cipher.getProvider().toString(); |
| } catch (Exception e) { |
| if (debug != null && Debug.isOn("handshake")) { |
| System.out.println("Retrieving The Cipher provider name" + |
| " caused exception " + e.getMessage()); |
| } |
| } |
| try { |
| return cipher.toString() + " (provider name not available)"; |
| } catch (Exception e) { |
| if (debug != null && Debug.isOn("handshake")) { |
| System.out.println("Retrieving The Cipher name" + |
| " caused exception " + e.getMessage()); |
| } |
| } |
| return "(cipher/provider names not available)"; |
| } |
| |
| /* |
| * Server gets the PKCS #1 (block format 02) data, decrypts |
| * it with its private key. |
| */ |
| @SuppressWarnings("deprecation") |
| RSAClientKeyExchange(ProtocolVersion currentVersion, |
| ProtocolVersion maxVersion, |
| SecureRandom generator, HandshakeInStream input, |
| int messageSize, PrivateKey privateKey) throws IOException { |
| |
| if (privateKey.getAlgorithm().equals("RSA") == false) { |
| throw new SSLKeyException("Private key not of type RSA: " + |
| privateKey.getAlgorithm()); |
| } |
| |
| if (currentVersion.useTLS10PlusSpec()) { |
| encrypted = input.getBytes16(); |
| } else { |
| encrypted = new byte [messageSize]; |
| if (input.read(encrypted) != messageSize) { |
| throw new SSLProtocolException( |
| "SSL: read PreMasterSecret: short read"); |
| } |
| } |
| |
| byte[] encoded = null; |
| try { |
| boolean needFailover = false; |
| Cipher cipher = JsseJce.getCipher(JsseJce.CIPHER_RSA_PKCS1); |
| try { |
| // Try UNWRAP_MODE mode firstly. |
| cipher.init(Cipher.UNWRAP_MODE, privateKey, |
| new TlsRsaPremasterSecretParameterSpec( |
| maxVersion.v, currentVersion.v), |
| generator); |
| |
| // The provider selection can be delayed, please don't call |
| // any Cipher method before the call to Cipher.init(). |
| needFailover = !KeyUtil.isOracleJCEProvider( |
| cipher.getProvider().getName()); |
| } catch (InvalidKeyException | UnsupportedOperationException iue) { |
| if (debug != null && Debug.isOn("handshake")) { |
| System.out.println("The Cipher provider " |
| + safeProviderName(cipher) |
| + " caused exception: " + iue.getMessage()); |
| } |
| |
| needFailover = true; |
| } |
| |
| if (needFailover) { |
| // The cipher might be spoiled by unsuccessful call to init(), |
| // so request a fresh instance |
| cipher = JsseJce.getCipher(JsseJce.CIPHER_RSA_PKCS1); |
| |
| // Use DECRYPT_MODE and dispose the previous initialization. |
| cipher.init(Cipher.DECRYPT_MODE, privateKey); |
| boolean failed = false; |
| try { |
| encoded = cipher.doFinal(encrypted); |
| } catch (BadPaddingException bpe) { |
| // Note: encoded == null |
| failed = true; |
| } |
| encoded = KeyUtil.checkTlsPreMasterSecretKey( |
| maxVersion.v, currentVersion.v, |
| generator, encoded, failed); |
| preMaster = generatePreMasterSecret( |
| maxVersion.v, currentVersion.v, |
| encoded, generator); |
| } else { |
| // the cipher should have been initialized |
| preMaster = (SecretKey)cipher.unwrap(encrypted, |
| "TlsRsaPremasterSecret", Cipher.SECRET_KEY); |
| } |
| } catch (InvalidKeyException ibk) { |
| // the message is too big to process with RSA |
| throw new SSLException( |
| "Unable to process PreMasterSecret", ibk); |
| } catch (Exception e) { |
| // unlikely to happen, otherwise, must be a provider exception |
| if (debug != null && Debug.isOn("handshake")) { |
| System.out.println("RSA premaster secret decryption error:"); |
| e.printStackTrace(System.out); |
| } |
| throw new RuntimeException("Could not generate dummy secret", e); |
| } |
| } |
| |
| // generate a premaster secret with the specified version number |
| @SuppressWarnings("deprecation") |
| private static SecretKey generatePreMasterSecret( |
| int clientVersion, int serverVersion, |
| byte[] encodedSecret, SecureRandom generator) { |
| |
| if (debug != null && Debug.isOn("handshake")) { |
| System.out.println("Generating a premaster secret"); |
| } |
| |
| try { |
| String s = ((clientVersion >= ProtocolVersion.TLS12.v) ? |
| "SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret"); |
| KeyGenerator kg = JsseJce.getKeyGenerator(s); |
| kg.init(new TlsRsaPremasterSecretParameterSpec( |
| clientVersion, serverVersion, encodedSecret), |
| generator); |
| return kg.generateKey(); |
| } catch (InvalidAlgorithmParameterException | |
| NoSuchAlgorithmException iae) { |
| // unlikely to happen, otherwise, must be a provider exception |
| if (debug != null && Debug.isOn("handshake")) { |
| System.out.println("RSA premaster secret generation error:"); |
| iae.printStackTrace(System.out); |
| } |
| throw new RuntimeException("Could not generate premaster secret", iae); |
| } |
| } |
| |
| @Override |
| int messageType() { |
| return ht_client_key_exchange; |
| } |
| |
| @Override |
| int messageLength() { |
| if (protocolVersion.useTLS10PlusSpec()) { |
| return encrypted.length + 2; |
| } else { |
| return encrypted.length; |
| } |
| } |
| |
| @Override |
| void send(HandshakeOutStream s) throws IOException { |
| if (protocolVersion.useTLS10PlusSpec()) { |
| s.putBytes16(encrypted); |
| } else { |
| s.write(encrypted); |
| } |
| } |
| |
| @Override |
| void print(PrintStream s) throws IOException { |
| String version = "version not available/extractable"; |
| |
| byte[] ba = preMaster.getEncoded(); |
| if (ba != null && ba.length >= 2) { |
| version = ProtocolVersion.valueOf(ba[0], ba[1]).name; |
| } |
| |
| s.println("*** ClientKeyExchange, RSA PreMasterSecret, " + version); |
| } |
| } |