/* * Copyright (c) 1996, 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; 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. */ private final static String PROP_NAME = "com.sun.net.ssl.rsaPreMasterSecretFix"; /* * Default is "false" (old behavior) for compatibility reasons in * SSLv3/TLSv1. Later protocols (TLSv1.1+) do not use this property. */ private final static boolean rsaPreMasterSecretFix = Debug.getBooleanProperty(PROP_NAME, false); /* * 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 || maxVersion.v >= ProtocolVersion.TLS11.v) { major = maxVersion.major; minor = maxVersion.minor; } else { major = protocolVersion.major; minor = protocolVersion.minor; } try { String s = ((protocolVersion.v >= ProtocolVersion.TLS12.v) ? "SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret"); KeyGenerator kg = JsseJce.getKeyGenerator(s); kg.init(new TlsRsaPremasterSecretParameterSpec(major, minor), 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); } } /* * Server gets the PKCS #1 (block format 02) data, decrypts * it with its private key. */ 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"); } 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); // polish the premaster secret preMaster = polishPreMasterSecretKey(currentVersion, maxVersion, generator, preMaster, null); } catch (Exception e) { // polish the premaster secret preMaster = polishPreMasterSecretKey(currentVersion, maxVersion, generator, null, e); } } /** * To avoid vulnerabilities described by section 7.4.7.1, RFC 5246, * treating incorrectly formatted message blocks and/or mismatched * version numbers in a manner indistinguishable from correctly * formatted RSA blocks. * * RFC 5246 describes the approach as : * * 1. Generate a string R of 46 random bytes * * 2. Decrypt the message to recover the plaintext M * * 3. If the PKCS#1 padding is not correct, or the length of message * M is not exactly 48 bytes: * pre_master_secret = ClientHello.client_version || R * else If ClientHello.client_version <= TLS 1.0, and version * number check is explicitly disabled: * pre_master_secret = M * else: * pre_master_secret = ClientHello.client_version || M[2..47] */ private SecretKey polishPreMasterSecretKey(ProtocolVersion currentVersion, ProtocolVersion clientHelloVersion, SecureRandom generator, SecretKey secretKey, Exception failoverException) { this.protocolVersion = clientHelloVersion; if (failoverException == null && secretKey != null) { // check the length byte[] encoded = secretKey.getEncoded(); if (encoded == null) { // unable to get the encoded key if (debug != null && Debug.isOn("handshake")) { System.out.println( "unable to get the plaintext of the premaster secret"); } // We are not always able to get the encoded key of the // premaster secret. Pass the cheking to master secret // calculation. return secretKey; } else if (encoded.length == 48) { // check the version if (clientHelloVersion.major == encoded[0] && clientHelloVersion.minor == encoded[1]) { return secretKey; } else if (clientHelloVersion.v <= ProtocolVersion.TLS10.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 (currentVersion.major == encoded[0] && currentVersion.minor == encoded[1]) { this.protocolVersion = currentVersion; return secretKey; } } if (debug != null && Debug.isOn("handshake")) { System.out.println("Mismatching Protocol Versions, " + "ClientHello.client_version is " + clientHelloVersion + ", while PreMasterSecret.client_version is " + ProtocolVersion.valueOf(encoded[0], encoded[1])); } } else { if (debug != null && Debug.isOn("handshake")) { System.out.println( "incorrect length of premaster secret: " + encoded.length); } } } if (debug != null && Debug.isOn("handshake")) { if (failoverException != null) { System.out.println("Error decrypting premaster secret:"); failoverException.printStackTrace(System.out); } System.out.println("Generating random secret"); } return generateDummySecret(clientHelloVersion); } // generate a premaster secret with the specified version number static SecretKey generateDummySecret(ProtocolVersion version) { try { String s = ((version.v >= ProtocolVersion.TLS12.v) ? "SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret"); KeyGenerator kg = JsseJce.getKeyGenerator(s); kg.init(new TlsRsaPremasterSecretParameterSpec (version.major, version.minor)); return kg.generateKey(); } catch (GeneralSecurityException e) { throw new RuntimeException("Could not generate dummy secret", e); } } @Override int messageType() { return ht_client_key_exchange; } @Override int messageLength() { if (protocolVersion.v >= ProtocolVersion.TLS10.v) { return encrypted.length + 2; } else { return encrypted.length; } } @Override void send(HandshakeOutStream s) throws IOException { if (protocolVersion.v >= ProtocolVersion.TLS10.v) { s.putBytes16(encrypted); } else { s.write(encrypted); } } @Override void print(PrintStream s) throws IOException { s.println("*** ClientKeyExchange, RSA PreMasterSecret, " + protocolVersion); }}
/*
* Copyright (c) 1996, 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;
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.
*/
private final static String PROP_NAME =
"com.sun.net.ssl.rsaPreMasterSecretFix";
/*
* Default is "false" (old behavior) for compatibility reasons in
* SSLv3/TLSv1. Later protocols (TLSv1.1+) do not use this property.
*/
private final static boolean rsaPreMasterSecretFix =
Debug.getBooleanProperty(PROP_NAME, false);
/*
* 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 || maxVersion.v >= ProtocolVersion.TLS11.v) {
major = maxVersion.major;
minor = maxVersion.minor;
} else {
major = protocolVersion.major;
minor = protocolVersion.minor;
}
try {
String s = ((protocolVersion.v >= ProtocolVersion.TLS12.v) ?
"SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret");
KeyGenerator kg = JsseJce.getKeyGenerator(s);
kg.init(new TlsRsaPremasterSecretParameterSpec(major, minor),
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);
}
}
/*
* Server gets the PKCS #1 (block format 02) data, decrypts
* it with its private key.
*/
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");
}
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);
// polish the premaster secret
preMaster = polishPreMasterSecretKey(currentVersion, maxVersion,
generator, preMaster, null);
} catch (Exception e) {
// polish the premaster secret
preMaster =
polishPreMasterSecretKey(currentVersion, maxVersion,
generator, null, e);
}
}
/**
* To avoid vulnerabilities described by section 7.4.7.1, RFC 5246,
* treating incorrectly formatted message blocks and/or mismatched
* version numbers in a manner indistinguishable from correctly
* formatted RSA blocks.
*
* RFC 5246 describes the approach as :
*
* 1. Generate a string R of 46 random bytes
*
* 2. Decrypt the message to recover the plaintext M
*
* 3. If the PKCS#1 padding is not correct, or the length of message
* M is not exactly 48 bytes:
* pre_master_secret = ClientHello.client_version || R
* else If ClientHello.client_version <= TLS 1.0, and version
* number check is explicitly disabled:
* pre_master_secret = M
* else:
* pre_master_secret = ClientHello.client_version || M[2..47]
*/
private SecretKey polishPreMasterSecretKey(ProtocolVersion currentVersion,
ProtocolVersion clientHelloVersion, SecureRandom generator,
SecretKey secretKey, Exception failoverException) {
this.protocolVersion = clientHelloVersion;
if (failoverException == null && secretKey != null) {
// check the length
byte[] encoded = secretKey.getEncoded();
if (encoded == null) { // unable to get the encoded key
if (debug != null && Debug.isOn("handshake")) {
System.out.println(
"unable to get the plaintext of the premaster secret");
}
// We are not always able to get the encoded key of the
// premaster secret. Pass the cheking to master secret
// calculation.
return secretKey;
} else if (encoded.length == 48) {
// check the version
if (clientHelloVersion.major == encoded[0] &&
clientHelloVersion.minor == encoded[1]) {
return secretKey;
} else if (clientHelloVersion.v <= ProtocolVersion.TLS10.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 (currentVersion.major == encoded[0] &&
currentVersion.minor == encoded[1]) {
this.protocolVersion = currentVersion;
return secretKey;
}
}
if (debug != null && Debug.isOn("handshake")) {
System.out.println("Mismatching Protocol Versions, " +
"ClientHello.client_version is " + clientHelloVersion +
", while PreMasterSecret.client_version is " +
ProtocolVersion.valueOf(encoded[0], encoded[1]));
}
} else {
if (debug != null && Debug.isOn("handshake")) {
System.out.println(
"incorrect length of premaster secret: " +
encoded.length);
}
}
}
if (debug != null && Debug.isOn("handshake")) {
if (failoverException != null) {
System.out.println("Error decrypting premaster secret:");
failoverException.printStackTrace(System.out);
}
System.out.println("Generating random secret");
}
return generateDummySecret(clientHelloVersion);
}
// generate a premaster secret with the specified version number
static SecretKey generateDummySecret(ProtocolVersion version) {
try {
String s = ((version.v >= ProtocolVersion.TLS12.v) ?
"SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret");
KeyGenerator kg = JsseJce.getKeyGenerator(s);
kg.init(new TlsRsaPremasterSecretParameterSpec
(version.major, version.minor));
return kg.generateKey();
} catch (GeneralSecurityException e) {
throw new RuntimeException("Could not generate dummy secret", e);
}
}
@Override
int messageType() {
return ht_client_key_exchange;
}
@Override
int messageLength() {
if (protocolVersion.v >= ProtocolVersion.TLS10.v) {
return encrypted.length + 2;
} else {
return encrypted.length;
}
}
@Override
void send(HandshakeOutStream s) throws IOException {
if (protocolVersion.v >= ProtocolVersion.TLS10.v) {
s.putBytes16(encrypted);
} else {
s.write(encrypted);
}
}
@Override
void print(PrintStream s) throws IOException {
s.println("*** ClientKeyExchange, RSA PreMasterSecret, " +
protocolVersion);
}
}