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698 lines
24 KiB
Java
698 lines
24 KiB
Java
/*
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* Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.ssl;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.util.Hashtable;
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import java.security.*;
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import javax.crypto.*;
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import javax.crypto.spec.SecretKeySpec;
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import javax.crypto.spec.IvParameterSpec;
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import java.nio.*;
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import sun.security.ssl.CipherSuite.*;
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import static sun.security.ssl.CipherSuite.*;
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import sun.misc.HexDumpEncoder;
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/**
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* This class handles bulk data enciphering/deciphering for each SSLv3
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* message. This provides data confidentiality. Stream ciphers (such
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* as RC4) don't need to do padding; block ciphers (e.g. DES) need it.
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*
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* Individual instances are obtained by calling the static method
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* newCipherBox(), which should only be invoked by BulkCipher.newCipher().
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*
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* In RFC 2246, with bock ciphers in CBC mode, the Initialization
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* Vector (IV) for the first record is generated with the other keys
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* and secrets when the security parameters are set. The IV for
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* subsequent records is the last ciphertext block from the previous
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* record.
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*
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* In RFC 4346, the implicit Initialization Vector (IV) is replaced
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* with an explicit IV to protect against CBC attacks. RFC 4346
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* recommends two algorithms used to generated the per-record IV.
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* The implementation uses the algorithm (2)(b), as described at
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* section 6.2.3.2 of RFC 4346.
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*
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* The usage of IV in CBC block cipher can be illustrated in
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* the following diagrams.
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*
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* (random)
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* R P1 IV C1
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* | | | |
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* SIV---+ |-----+ |-... |----- |------
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* | | | | | | | |
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* +----+ | +----+ | +----+ | +----+ |
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* | Ek | | + Ek + | | Dk | | | Dk | |
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* +----+ | +----+ | +----+ | +----+ |
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* | | | | | | | |
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* |----| |----| SIV--+ |----| |-...
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* | | | |
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* IV C1 R P1
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* (discard)
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*
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* CBC Encryption CBC Decryption
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*
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* NOTE that any ciphering involved in key exchange (e.g. with RSA) is
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* handled separately.
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*
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* @author David Brownell
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* @author Andreas Sterbenz
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*/
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final class CipherBox {
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// A CipherBox that implements the identity operation
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final static CipherBox NULL = new CipherBox();
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/* Class and subclass dynamic debugging support */
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private static final Debug debug = Debug.getInstance("ssl");
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// the protocol version this cipher conforms to
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private final ProtocolVersion protocolVersion;
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// cipher object
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private final Cipher cipher;
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/**
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* Cipher blocksize, 0 for stream ciphers
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*/
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private int blockSize;
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/**
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* secure random
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*/
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private SecureRandom random;
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/**
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* Fixed masks of various block size, as the initial decryption IVs
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* for TLS 1.1 or later.
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*
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* For performance, we do not use random IVs. As the initial decryption
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* IVs will be discarded by TLS decryption processes, so the fixed masks
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* do not hurt cryptographic strength.
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*/
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private static Hashtable<Integer, IvParameterSpec> masks;
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/**
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* NULL cipherbox. Identity operation, no encryption.
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*/
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private CipherBox() {
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this.protocolVersion = ProtocolVersion.DEFAULT;
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this.cipher = null;
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}
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/**
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* Construct a new CipherBox using the cipher transformation.
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*
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* @exception NoSuchAlgorithmException if no appropriate JCE Cipher
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* implementation could be found.
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*/
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private CipherBox(ProtocolVersion protocolVersion, BulkCipher bulkCipher,
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SecretKey key, IvParameterSpec iv, SecureRandom random,
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boolean encrypt) throws NoSuchAlgorithmException {
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try {
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this.protocolVersion = protocolVersion;
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this.cipher = JsseJce.getCipher(bulkCipher.transformation);
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int mode = encrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE;
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if (random == null) {
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random = JsseJce.getSecureRandom();
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}
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this.random = random;
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/*
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* RFC 4346 recommends two algorithms used to generated the
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* per-record IV. The implementation uses the algorithm (2)(b),
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* as described at section 6.2.3.2 of RFC 4346.
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*
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* As we don't care about the initial IV value for TLS 1.1 or
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* later, so if the "iv" parameter is null, we use the default
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* value generated by Cipher.init() for encryption, and a fixed
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* mask for decryption.
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*/
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if (iv == null && bulkCipher.ivSize != 0 &&
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mode == Cipher.DECRYPT_MODE &&
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protocolVersion.v >= ProtocolVersion.TLS11.v) {
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iv = getFixedMask(bulkCipher.ivSize);
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}
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cipher.init(mode, key, iv, random);
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// Do not call getBlockSize until after init()
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// otherwise we would disrupt JCE delayed provider selection
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blockSize = cipher.getBlockSize();
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// some providers implement getBlockSize() incorrectly
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if (blockSize == 1) {
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blockSize = 0;
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}
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} catch (NoSuchAlgorithmException e) {
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throw e;
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} catch (Exception e) {
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throw new NoSuchAlgorithmException
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("Could not create cipher " + bulkCipher, e);
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} catch (ExceptionInInitializerError e) {
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throw new NoSuchAlgorithmException
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("Could not create cipher " + bulkCipher, e);
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}
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}
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/*
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* Factory method to obtain a new CipherBox object.
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*/
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static CipherBox newCipherBox(ProtocolVersion version, BulkCipher cipher,
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SecretKey key, IvParameterSpec iv, SecureRandom random,
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boolean encrypt) throws NoSuchAlgorithmException {
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if (cipher.allowed == false) {
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throw new NoSuchAlgorithmException("Unsupported cipher " + cipher);
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}
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if (cipher == B_NULL) {
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return NULL;
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} else {
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return new CipherBox(version, cipher, key, iv, random, encrypt);
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}
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}
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/*
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* Get a fixed mask, as the initial decryption IVs for TLS 1.1 or later.
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*/
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private static IvParameterSpec getFixedMask(int ivSize) {
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if (masks == null) {
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masks = new Hashtable<Integer, IvParameterSpec>(5);
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}
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IvParameterSpec iv = masks.get(ivSize);
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if (iv == null) {
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iv = new IvParameterSpec(new byte[ivSize]);
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masks.put(ivSize, iv);
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}
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return iv;
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}
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/*
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* Encrypts a block of data, returning the size of the
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* resulting block.
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*/
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int encrypt(byte[] buf, int offset, int len) {
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if (cipher == null) {
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return len;
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}
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try {
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if (blockSize != 0) {
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// TLSv1.1 needs a IV block
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if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
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// generate a random number
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byte[] prefix = new byte[blockSize];
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random.nextBytes(prefix);
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// move forward the plaintext
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System.arraycopy(buf, offset,
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buf, offset + prefix.length, len);
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// prefix the plaintext
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System.arraycopy(prefix, 0,
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buf, offset, prefix.length);
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len += prefix.length;
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}
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len = addPadding(buf, offset, len, blockSize);
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}
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if (debug != null && Debug.isOn("plaintext")) {
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try {
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HexDumpEncoder hd = new HexDumpEncoder();
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System.out.println(
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"Padded plaintext before ENCRYPTION: len = "
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+ len);
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hd.encodeBuffer(
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new ByteArrayInputStream(buf, offset, len),
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System.out);
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} catch (IOException e) { }
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}
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int newLen = cipher.update(buf, offset, len, buf, offset);
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if (newLen != len) {
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// catch BouncyCastle buffering error
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throw new RuntimeException("Cipher buffering error " +
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"in JCE provider " + cipher.getProvider().getName());
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}
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return newLen;
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} catch (ShortBufferException e) {
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throw new ArrayIndexOutOfBoundsException(e.toString());
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}
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}
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/*
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* Encrypts a ByteBuffer block of data, returning the size of the
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* resulting block.
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*
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* The byte buffers position and limit initially define the amount
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* to encrypt. On return, the position and limit are
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* set to last position padded/encrypted. The limit may have changed
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* because of the added padding bytes.
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*/
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int encrypt(ByteBuffer bb) {
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int len = bb.remaining();
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if (cipher == null) {
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bb.position(bb.limit());
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return len;
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}
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try {
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int pos = bb.position();
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if (blockSize != 0) {
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// TLSv1.1 needs a IV block
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if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
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// generate a random number
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byte[] prefix = new byte[blockSize];
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random.nextBytes(prefix);
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// move forward the plaintext
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byte[] buf = null;
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int limit = bb.limit();
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if (bb.hasArray()) {
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int arrayOffset = bb.arrayOffset();
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buf = bb.array();
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System.arraycopy(buf, arrayOffset + pos,
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buf, arrayOffset + pos + prefix.length,
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limit - pos);
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bb.limit(limit + prefix.length);
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} else {
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buf = new byte[limit - pos];
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bb.get(buf, 0, limit - pos);
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bb.position(pos + prefix.length);
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bb.limit(limit + prefix.length);
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bb.put(buf);
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}
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bb.position(pos);
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// prefix the plaintext
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bb.put(prefix);
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bb.position(pos);
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}
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// addPadding adjusts pos/limit
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len = addPadding(bb, blockSize);
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bb.position(pos);
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}
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if (debug != null && Debug.isOn("plaintext")) {
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try {
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HexDumpEncoder hd = new HexDumpEncoder();
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System.out.println(
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"Padded plaintext before ENCRYPTION: len = "
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+ len);
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hd.encodeBuffer(bb, System.out);
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} catch (IOException e) { }
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/*
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* reset back to beginning
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*/
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bb.position(pos);
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}
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/*
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* Encrypt "in-place". This does not add its own padding.
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*/
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ByteBuffer dup = bb.duplicate();
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int newLen = cipher.update(dup, bb);
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if (bb.position() != dup.position()) {
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throw new RuntimeException("bytebuffer padding error");
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}
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if (newLen != len) {
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// catch BouncyCastle buffering error
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throw new RuntimeException("Cipher buffering error " +
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"in JCE provider " + cipher.getProvider().getName());
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}
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return newLen;
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} catch (ShortBufferException e) {
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RuntimeException exc = new RuntimeException(e.toString());
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exc.initCause(e);
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throw exc;
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}
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}
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/*
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* Decrypts a block of data, returning the size of the
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* resulting block if padding was required.
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*
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* For SSLv3 and TLSv1.0, with block ciphers in CBC mode the
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* Initialization Vector (IV) for the first record is generated by
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* the handshake protocol, the IV for subsequent records is the
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* last ciphertext block from the previous record.
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*
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* From TLSv1.1, the implicit IV is replaced with an explicit IV to
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* protect against CBC attacks.
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*
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* Differentiating between bad_record_mac and decryption_failed alerts
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* may permit certain attacks against CBC mode. It is preferable to
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* uniformly use the bad_record_mac alert to hide the specific type of
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* the error.
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*/
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int decrypt(byte[] buf, int offset, int len) throws BadPaddingException {
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if (cipher == null) {
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return len;
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}
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try {
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int newLen = cipher.update(buf, offset, len, buf, offset);
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if (newLen != len) {
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// catch BouncyCastle buffering error
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throw new RuntimeException("Cipher buffering error " +
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"in JCE provider " + cipher.getProvider().getName());
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}
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if (debug != null && Debug.isOn("plaintext")) {
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try {
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HexDumpEncoder hd = new HexDumpEncoder();
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System.out.println(
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"Padded plaintext after DECRYPTION: len = "
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+ newLen);
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hd.encodeBuffer(
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new ByteArrayInputStream(buf, offset, newLen),
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System.out);
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} catch (IOException e) { }
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}
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if (blockSize != 0) {
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newLen = removePadding(buf, offset, newLen,
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blockSize, protocolVersion);
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if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
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if (newLen < blockSize) {
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throw new BadPaddingException("invalid explicit IV");
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}
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// discards the first cipher block, the IV component.
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System.arraycopy(buf, offset + blockSize,
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buf, offset, newLen - blockSize);
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newLen -= blockSize;
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}
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}
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return newLen;
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} catch (ShortBufferException e) {
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throw new ArrayIndexOutOfBoundsException(e.toString());
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}
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}
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/*
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* Decrypts a block of data, returning the size of the
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* resulting block if padding was required. position and limit
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* point to the end of the decrypted/depadded data. The initial
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* limit and new limit may be different, given we may
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* have stripped off some padding bytes.
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*
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* @see decrypt(byte[], int, int)
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*/
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int decrypt(ByteBuffer bb) throws BadPaddingException {
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int len = bb.remaining();
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if (cipher == null) {
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bb.position(bb.limit());
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return len;
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}
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try {
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/*
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* Decrypt "in-place".
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*/
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int pos = bb.position();
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ByteBuffer dup = bb.duplicate();
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int newLen = cipher.update(dup, bb);
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if (newLen != len) {
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// catch BouncyCastle buffering error
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throw new RuntimeException("Cipher buffering error " +
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"in JCE provider " + cipher.getProvider().getName());
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}
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if (debug != null && Debug.isOn("plaintext")) {
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bb.position(pos);
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try {
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HexDumpEncoder hd = new HexDumpEncoder();
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System.out.println(
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"Padded plaintext after DECRYPTION: len = "
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+ newLen);
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hd.encodeBuffer(bb, System.out);
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} catch (IOException e) { }
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}
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/*
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* Remove the block padding.
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*/
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if (blockSize != 0) {
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bb.position(pos);
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newLen = removePadding(bb, blockSize, protocolVersion);
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if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
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if (newLen < blockSize) {
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throw new BadPaddingException("invalid explicit IV");
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}
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// discards the first cipher block, the IV component.
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byte[] buf = null;
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int limit = bb.limit();
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if (bb.hasArray()) {
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int arrayOffset = bb.arrayOffset();
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buf = bb.array();
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System.arraycopy(buf, arrayOffset + pos + blockSize,
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buf, arrayOffset + pos, limit - pos - blockSize);
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bb.limit(limit - blockSize);
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} else {
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buf = new byte[limit - pos - blockSize];
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bb.position(pos + blockSize);
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bb.get(buf);
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bb.position(pos);
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bb.put(buf);
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bb.limit(limit - blockSize);
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}
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// reset the position to the end of the decrypted data
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limit = bb.limit();
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bb.position(limit);
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}
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}
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return newLen;
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} catch (ShortBufferException e) {
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RuntimeException exc = new RuntimeException(e.toString());
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exc.initCause(e);
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throw exc;
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}
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}
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private static int addPadding(byte[] buf, int offset, int len,
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int blockSize) {
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int newlen = len + 1;
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byte pad;
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int i;
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if ((newlen % blockSize) != 0) {
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newlen += blockSize - 1;
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newlen -= newlen % blockSize;
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}
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pad = (byte) (newlen - len);
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if (buf.length < (newlen + offset)) {
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throw new IllegalArgumentException("no space to pad buffer");
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}
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/*
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* TLS version of the padding works for both SSLv3 and TLSv1
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*/
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for (i = 0, offset += len; i < pad; i++) {
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buf [offset++] = (byte) (pad - 1);
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}
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return newlen;
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}
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/*
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* Apply the padding to the buffer.
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*
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* Limit is advanced to the new buffer length.
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* Position is equal to limit.
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*/
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private static int addPadding(ByteBuffer bb, int blockSize) {
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|
|
int len = bb.remaining();
|
|
int offset = bb.position();
|
|
|
|
int newlen = len + 1;
|
|
byte pad;
|
|
int i;
|
|
|
|
if ((newlen % blockSize) != 0) {
|
|
newlen += blockSize - 1;
|
|
newlen -= newlen % blockSize;
|
|
}
|
|
pad = (byte) (newlen - len);
|
|
|
|
/*
|
|
* Update the limit to what will be padded.
|
|
*/
|
|
bb.limit(newlen + offset);
|
|
|
|
/*
|
|
* TLS version of the padding works for both SSLv3 and TLSv1
|
|
*/
|
|
for (i = 0, offset += len; i < pad; i++) {
|
|
bb.put(offset++, (byte) (pad - 1));
|
|
}
|
|
|
|
bb.position(offset);
|
|
bb.limit(offset);
|
|
|
|
return newlen;
|
|
}
|
|
|
|
|
|
/*
|
|
* Typical TLS padding format for a 64 bit block cipher is as follows:
|
|
* xx xx xx xx xx xx xx 00
|
|
* xx xx xx xx xx xx 01 01
|
|
* ...
|
|
* xx 06 06 06 06 06 06 06
|
|
* 07 07 07 07 07 07 07 07
|
|
* TLS also allows any amount of padding from 1 and 256 bytes as long
|
|
* as it makes the data a multiple of the block size
|
|
*/
|
|
private static int removePadding(byte[] buf, int offset, int len,
|
|
int blockSize, ProtocolVersion protocolVersion)
|
|
throws BadPaddingException {
|
|
// last byte is length byte (i.e. actual padding length - 1)
|
|
int padOffset = offset + len - 1;
|
|
int pad = buf[padOffset] & 0x0ff;
|
|
|
|
int newlen = len - (pad + 1);
|
|
if (newlen < 0) {
|
|
throw new BadPaddingException("Padding length invalid: " + pad);
|
|
}
|
|
|
|
if (protocolVersion.v >= ProtocolVersion.TLS10.v) {
|
|
for (int i = 1; i <= pad; i++) {
|
|
int val = buf[padOffset - i] & 0xff;
|
|
if (val != pad) {
|
|
throw new BadPaddingException
|
|
("Invalid TLS padding: " + val);
|
|
}
|
|
}
|
|
} else { // SSLv3
|
|
// SSLv3 requires 0 <= length byte < block size
|
|
// some implementations do 1 <= length byte <= block size,
|
|
// so accept that as well
|
|
// v3 does not require any particular value for the other bytes
|
|
if (pad > blockSize) {
|
|
throw new BadPaddingException("Invalid SSLv3 padding: " + pad);
|
|
}
|
|
}
|
|
return newlen;
|
|
}
|
|
|
|
/*
|
|
* Position/limit is equal the removed padding.
|
|
*/
|
|
private static int removePadding(ByteBuffer bb,
|
|
int blockSize, ProtocolVersion protocolVersion)
|
|
throws BadPaddingException {
|
|
|
|
int len = bb.remaining();
|
|
int offset = bb.position();
|
|
|
|
// last byte is length byte (i.e. actual padding length - 1)
|
|
int padOffset = offset + len - 1;
|
|
int pad = bb.get(padOffset) & 0x0ff;
|
|
|
|
int newlen = len - (pad + 1);
|
|
if (newlen < 0) {
|
|
throw new BadPaddingException("Padding length invalid: " + pad);
|
|
}
|
|
|
|
/*
|
|
* We could zero the padding area, but not much useful
|
|
* information there.
|
|
*/
|
|
if (protocolVersion.v >= ProtocolVersion.TLS10.v) {
|
|
bb.put(padOffset, (byte)0); // zero the padding.
|
|
for (int i = 1; i <= pad; i++) {
|
|
int val = bb.get(padOffset - i) & 0xff;
|
|
if (val != pad) {
|
|
throw new BadPaddingException
|
|
("Invalid TLS padding: " + val);
|
|
}
|
|
}
|
|
} else { // SSLv3
|
|
// SSLv3 requires 0 <= length byte < block size
|
|
// some implementations do 1 <= length byte <= block size,
|
|
// so accept that as well
|
|
// v3 does not require any particular value for the other bytes
|
|
if (pad > blockSize) {
|
|
throw new BadPaddingException("Invalid SSLv3 padding: " + pad);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Reset buffer limit to remove padding.
|
|
*/
|
|
bb.position(offset + newlen);
|
|
bb.limit(offset + newlen);
|
|
|
|
return newlen;
|
|
}
|
|
|
|
/*
|
|
* Dispose of any intermediate state in the underlying cipher.
|
|
* For PKCS11 ciphers, this will release any attached sessions, and
|
|
* thus make finalization faster.
|
|
*/
|
|
void dispose() {
|
|
try {
|
|
if (cipher != null) {
|
|
// ignore return value.
|
|
cipher.doFinal();
|
|
}
|
|
} catch (GeneralSecurityException e) {
|
|
// swallow for now.
|
|
}
|
|
}
|
|
|
|
}
|