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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | |||
| 27 | package sun.security.ssl; | ||
| 28 | |||
| 29 | import java.io.*; | ||
| 30 | import java.security.*; | ||
| 31 | import java.security.interfaces.*; | ||
| 32 | |||
| 33 | import javax.crypto.*; | ||
| 34 | import javax.crypto.spec.*; | ||
| 35 | |||
| 36 | import javax.net.ssl.*; | ||
| 37 | |||
| 38 | import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec; | ||
| 39 | |||
| 40 | /** | ||
| 41 | * This is the client key exchange message (CLIENT --> SERVER) used with | ||
| 42 | * all RSA key exchanges; it holds the RSA-encrypted pre-master secret. | ||
| 43 | * | ||
| 44 | * The message is encrypted using PKCS #1 block type 02 encryption with the | ||
| 45 | * server's public key. The padding and resulting message size is a function | ||
| 46 | * of this server's public key modulus size, but the pre-master secret is | ||
| 47 | * always exactly 48 bytes. | ||
| 48 | * | ||
| 49 | */ | ||
| 50 | final class RSAClientKeyExchange extends HandshakeMessage { | ||
| 51 | |||
| 52 | /** | ||
| 53 | * The TLS spec says that the version in the RSA premaster secret must | ||
| 54 | * be the maximum version supported by the client (i.e. the version it | ||
| 55 | * requested in its client hello version). However, we (and other | ||
| 56 | * implementations) used to send the active negotiated version. The | ||
| 57 | * system property below allows to toggle the behavior. | ||
| 58 | */ | ||
| 59 | private final static String PROP_NAME = | ||
| 60 | "com.sun.net.ssl.rsaPreMasterSecretFix"; | ||
| 61 | |||
| 62 | /* | ||
| 63 | * Default is "false" (old behavior) for compatibility reasons in | ||
| 64 | * SSLv3/TLSv1. Later protocols (TLSv1.1+) do not use this property. | ||
| 65 | */ | ||
| 66 | private final static boolean rsaPreMasterSecretFix = | ||
| 67 | Debug.getBooleanProperty(PROP_NAME, false); | ||
| 68 | |||
| 69 | /* | ||
| 70 | * The following field values were encrypted with the server's public | ||
| 71 | * key (or temp key from server key exchange msg) and are presented | ||
| 72 | * here in DECRYPTED form. | ||
| 73 | */ | ||
| 74 | private ProtocolVersion protocolVersion; // preMaster [0,1] | ||
| 75 | SecretKey preMaster; | ||
| 76 | private byte[] encrypted; // same size as public modulus | ||
| 77 | |||
| 78 | /* | ||
| 79 | * Client randomly creates a pre-master secret and encrypts it | ||
| 80 | * using the server's RSA public key; only the server can decrypt | ||
| 81 | * it, using its RSA private key. Result is the same size as the | ||
| 82 | * server's public key, and uses PKCS #1 block format 02. | ||
| 83 | */ | ||
| 84 | RSAClientKeyExchange(ProtocolVersion protocolVersion, | ||
| 85 | ProtocolVersion maxVersion, | ||
| 86 | SecureRandom generator, PublicKey publicKey) throws IOException { | ||
| 87 | if (publicKey.getAlgorithm().equals("RSA") == false) { | ||
| 88 | throw new SSLKeyException("Public key not of type RSA"); | ||
| 89 | } | ||
| 90 | this.protocolVersion = protocolVersion; | ||
| 91 | |||
| 92 | int major, minor; | ||
| 93 | |||
| 94 | if (rsaPreMasterSecretFix || maxVersion.v >= ProtocolVersion.TLS11.v) { | ||
| 95 | major = maxVersion.major; | ||
| 96 | minor = maxVersion.minor; | ||
| 97 | } else { | ||
| 98 | major = protocolVersion.major; | ||
| 99 | minor = protocolVersion.minor; | ||
| 100 | } | ||
| 101 | |||
| 102 | try { | ||
| 103 | String s = ((protocolVersion.v >= ProtocolVersion.TLS12.v) ? | ||
| 104 | "SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret"); | ||
| 105 | KeyGenerator kg = JsseJce.getKeyGenerator(s); | ||
| 106 | kg.init(new TlsRsaPremasterSecretParameterSpec(major, minor), | ||
| 107 | generator); | ||
| 108 | preMaster = kg.generateKey(); | ||
| 109 | |||
| 110 | Cipher cipher = JsseJce.getCipher(JsseJce.CIPHER_RSA_PKCS1); | ||
| 111 | cipher.init(Cipher.WRAP_MODE, publicKey, generator); | ||
| 112 | encrypted = cipher.wrap(preMaster); | ||
| 113 | } catch (GeneralSecurityException e) { | ||
| 114 | throw (SSLKeyException)new SSLKeyException | ||
| 115 | ("RSA premaster secret error").initCause(e); | ||
| 116 | } | ||
| 117 | } | ||
| 118 | |||
| 119 | /* | ||
| 120 | * Server gets the PKCS #1 (block format 02) data, decrypts | ||
| 121 | * it with its private key. | ||
| 122 | */ | ||
| 123 | RSAClientKeyExchange(ProtocolVersion currentVersion, | ||
| 124 | ProtocolVersion maxVersion, | ||
| 125 | SecureRandom generator, HandshakeInStream input, | ||
| 126 | int messageSize, PrivateKey privateKey) throws IOException { | ||
| 127 | |||
| 128 | if (privateKey.getAlgorithm().equals("RSA") == false) { | ||
| 129 | throw new SSLKeyException("Private key not of type RSA"); | ||
| 130 | } | ||
| 131 | |||
| 132 | if (currentVersion.v >= ProtocolVersion.TLS10.v) { | ||
| 133 | encrypted = input.getBytes16(); | ||
| 134 | } else { | ||
| 135 | encrypted = new byte [messageSize]; | ||
| 136 | if (input.read(encrypted) != messageSize) { | ||
| 137 | throw new SSLProtocolException | ||
| 138 | ("SSL: read PreMasterSecret: short read"); | ||
| 139 | } | ||
| 140 | } | ||
| 141 | |||
| 142 | try { | ||
| 143 | Cipher cipher = JsseJce.getCipher(JsseJce.CIPHER_RSA_PKCS1); | ||
| 144 | cipher.init(Cipher.UNWRAP_MODE, privateKey); | ||
| 145 | preMaster = (SecretKey)cipher.unwrap(encrypted, | ||
| 146 | "TlsRsaPremasterSecret", Cipher.SECRET_KEY); | ||
| 147 | |||
| 148 | // polish the premaster secret | ||
| 149 | preMaster = polishPreMasterSecretKey(currentVersion, maxVersion, | ||
| 150 | generator, preMaster, null); | ||
| 151 | } catch (Exception e) { | ||
| 152 | // polish the premaster secret | ||
| 153 | preMaster = | ||
| 154 | polishPreMasterSecretKey(currentVersion, maxVersion, | ||
| 155 | generator, null, e); | ||
| 156 | } | ||
| 157 | } | ||
| 158 | |||
| 159 | /** | ||
| 160 | * To avoid vulnerabilities described by section 7.4.7.1, RFC 5246, | ||
| 161 | * treating incorrectly formatted message blocks and/or mismatched | ||
| 162 | * version numbers in a manner indistinguishable from correctly | ||
| 163 | * formatted RSA blocks. | ||
| 164 | * | ||
| 165 | * RFC 5246 describes the approach as : | ||
| 166 | * | ||
| 167 | * 1. Generate a string R of 46 random bytes | ||
| 168 | * | ||
| 169 | * 2. Decrypt the message to recover the plaintext M | ||
| 170 | * | ||
| 171 | * 3. If the PKCS#1 padding is not correct, or the length of message | ||
| 172 | * M is not exactly 48 bytes: | ||
| 173 | * pre_master_secret = ClientHello.client_version || R | ||
| 174 | * else If ClientHello.client_version <= TLS 1.0, and version | ||
| 175 | * number check is explicitly disabled: | ||
| 176 | * pre_master_secret = M | ||
| 177 | * else: | ||
| 178 | * pre_master_secret = ClientHello.client_version || M[2..47] | ||
| 179 | */ | ||
| 180 | private SecretKey polishPreMasterSecretKey(ProtocolVersion currentVersion, | ||
| 181 | ProtocolVersion clientHelloVersion, SecureRandom generator, | ||
| 182 | SecretKey secretKey, Exception failoverException) { | ||
| 183 | |||
| 184 | this.protocolVersion = clientHelloVersion; | ||
| 185 | |||
| 186 | if (failoverException == null && secretKey != null) { | ||
| 187 | // check the length | ||
| 188 | byte[] encoded = secretKey.getEncoded(); | ||
| 189 | if (encoded == null) { // unable to get the encoded key | ||
| 190 | if (debug != null && Debug.isOn("handshake")) { | ||
| 191 | System.out.println( | ||
| 192 | "unable to get the plaintext of the premaster secret"); | ||
| 193 | } | ||
| 194 | |||
| 195 | // We are not always able to get the encoded key of the | ||
| 196 | // premaster secret. Pass the cheking to master secret | ||
| 197 | // calculation. | ||
| 198 | return secretKey; | ||
| 199 | } else if (encoded.length == 48) { | ||
| 200 | // check the version | ||
| 201 | if (clientHelloVersion.major == encoded[0] && | ||
| 202 | clientHelloVersion.minor == encoded[1]) { | ||
| 203 | return secretKey; | ||
| 204 | } else if (clientHelloVersion.v <= ProtocolVersion.TLS10.v) { | ||
| 205 | /* | ||
| 206 | * we never checked the client_version in server side | ||
| 207 | * for TLS v1.0 and SSL v3.0. For compatibility, we | ||
| 208 | * maintain this behavior. | ||
| 209 | */ | ||
| 210 | if (currentVersion.major == encoded[0] && | ||
| 211 | currentVersion.minor == encoded[1]) { | ||
| 212 | this.protocolVersion = currentVersion; | ||
| 213 | return secretKey; | ||
| 214 | } | ||
| 215 | } | ||
| 216 | |||
| 217 | if (debug != null && Debug.isOn("handshake")) { | ||
| 218 | System.out.println("Mismatching Protocol Versions, " + | ||
| 219 | "ClientHello.client_version is " + clientHelloVersion + | ||
| 220 | ", while PreMasterSecret.client_version is " + | ||
| 221 | ProtocolVersion.valueOf(encoded[0], encoded[1])); | ||
| 222 | } | ||
| 223 | } else { | ||
| 224 | if (debug != null && Debug.isOn("handshake")) { | ||
| 225 | System.out.println( | ||
| 226 | "incorrect length of premaster secret: " + | ||
| 227 | encoded.length); | ||
| 228 | } | ||
| 229 | } | ||
| 230 | } | ||
| 231 | |||
| 232 | if (debug != null && Debug.isOn("handshake")) { | ||
| 233 | if (failoverException != null) { | ||
| 234 | System.out.println("Error decrypting premaster secret:"); | ||
| 235 | failoverException.printStackTrace(System.out); | ||
| 236 | } | ||
| 237 | |||
| 238 | System.out.println("Generating random secret"); | ||
| 239 | } | ||
| 240 | |||
| 241 | return generateDummySecret(clientHelloVersion); | ||
| 242 | } | ||
| 243 | |||
| 244 | // generate a premaster secret with the specified version number | ||
| 245 | static SecretKey generateDummySecret(ProtocolVersion version) { | ||
| 246 | try { | ||
| 247 | String s = ((version.v >= ProtocolVersion.TLS12.v) ? | ||
| 248 | "SunTls12RsaPremasterSecret" : "SunTlsRsaPremasterSecret"); | ||
| 249 | KeyGenerator kg = JsseJce.getKeyGenerator(s); | ||
| 250 | kg.init(new TlsRsaPremasterSecretParameterSpec | ||
| 251 | (version.major, version.minor)); | ||
| 252 | return kg.generateKey(); | ||
| 253 | } catch (GeneralSecurityException e) { | ||
| 254 | throw new RuntimeException("Could not generate dummy secret", e); | ||
| 255 | } | ||
| 256 | } | ||
| 257 | |||
| 258 | @Override | ||
| 259 | int messageType() { | ||
| 260 | return ht_client_key_exchange; | ||
| 261 | } | ||
| 262 | |||
| 263 | @Override | ||
| 264 | int messageLength() { | ||
| 265 | if (protocolVersion.v >= ProtocolVersion.TLS10.v) { | ||
| 266 | return encrypted.length + 2; | ||
| 267 | } else { | ||
| 268 | return encrypted.length; | ||
| 269 | } | ||
| 270 | } | ||
| 271 | |||
| 272 | @Override | ||
| 273 | void send(HandshakeOutStream s) throws IOException { | ||
| 274 | if (protocolVersion.v >= ProtocolVersion.TLS10.v) { | ||
| 275 | s.putBytes16(encrypted); | ||
| 276 | } else { | ||
| 277 | s.write(encrypted); | ||
| 278 | } | ||
| 279 | } | ||
| 280 | |||
| 281 | @Override | ||
| 282 | void print(PrintStream s) throws IOException { | ||
| 283 | s.println("*** ClientKeyExchange, RSA PreMasterSecret, " + | ||
| 284 | protocolVersion); | ||
| 285 | } | ||
| 286 | } | ||