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提交 4190b8c4 编写于 作者: X xuelei
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8006777: Improve TLS handling of invalid messages 

Reviewed-by: wetmore, ahgross
上级 0c420346
隐藏空白更改
内联 并排
Showing with 512 addition and 194 deletion
src/share/classes/sun/security/ssl/CipherBox.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 2013, 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
......@@ -392,7 +392,8 @@ final class CipherBox {
* uniformly use the bad_record_mac alert to hide the specific type of
* the error.
*/
int decrypt(byte[] buf, int offset, int len) throws BadPaddingException {
int decrypt(byte[] buf, int offset, int len,
int tagLen) throws BadPaddingException {
if (cipher == null) {
return len;
}
......@@ -416,9 +417,10 @@ final class CipherBox {
System.out);
} catch (IOException e) { }
}
if (blockSize != 0) {
newLen = removePadding(buf, offset, newLen,
blockSize, protocolVersion);
newLen = removePadding(
buf, offset, newLen, tagLen, blockSize, protocolVersion);
if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
if (newLen < blockSize) {
......@@ -448,7 +450,7 @@ final class CipherBox {
*
* @see decrypt(byte[], int, int)
*/
int decrypt(ByteBuffer bb) throws BadPaddingException {
int decrypt(ByteBuffer bb, int tagLen) throws BadPaddingException {
int len = bb.remaining();
......@@ -471,7 +473,6 @@ final class CipherBox {
}
if (debug != null && Debug.isOn("plaintext")) {
bb.position(pos);
try {
HexDumpEncoder hd = new HexDumpEncoder();
......@@ -479,7 +480,8 @@ final class CipherBox {
"Padded plaintext after DECRYPTION: len = "
+ newLen);
hd.encodeBuffer(bb, System.out);
hd.encodeBuffer(
(ByteBuffer)bb.duplicate().position(pos), System.out);
} catch (IOException e) { }
}
......@@ -488,7 +490,8 @@ final class CipherBox {
*/
if (blockSize != 0) {
bb.position(pos);
newLen = removePadding(bb, blockSize, protocolVersion);
newLen = removePadding(
bb, tagLen, blockSize, protocolVersion);
if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
if (newLen < blockSize) {
......@@ -590,6 +593,65 @@ final class CipherBox {
return newlen;
}
/*
* A constant-time check of the padding.
*
* NOTE that we are checking both the padding and the padLen bytes here.
*
* The caller MUST ensure that the len parameter is a positive number.
*/
private static int[] checkPadding(
byte[] buf, int offset, int len, byte pad) {
if (len <= 0) {
throw new RuntimeException("padding len must be positive");
}
// An array of hits is used to prevent Hotspot optimization for
// the purpose of a constant-time check.
int[] results = {0, 0}; // {missed #, matched #}
for (int i = 0; i <= 256;) {
for (int j = 0; j < len && i <= 256; j++, i++) { // j <= i
if (buf[offset + j] != pad) {
results[0]++; // mismatched padding data
} else {
results[1]++; // matched padding data
}
}
}
return results;
}
/*
* A constant-time check of the padding.
*
* NOTE that we are checking both the padding and the padLen bytes here.
*
* The caller MUST ensure that the bb parameter has remaining.
*/
private static int[] checkPadding(ByteBuffer bb, byte pad) {
if (!bb.hasRemaining()) {
throw new RuntimeException("hasRemaining() must be positive");
}
// An array of hits is used to prevent Hotspot optimization for
// the purpose of a constant-time check.
int[] results = {0, 0}; // {missed #, matched #}
bb.mark();
for (int i = 0; i <= 256; bb.reset()) {
for (; bb.hasRemaining() && i <= 256; i++) {
if (bb.get() != pad) {
results[0]++; // mismatched padding data
} else {
results[1]++; // matched padding data
}
}
}
return results;
}
/*
* Typical TLS padding format for a 64 bit block cipher is as follows:
......@@ -602,86 +664,95 @@ final class CipherBox {
* 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 {
int tagLen, 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);
int padLen = buf[padOffset] & 0xFF;
int newLen = len - (padLen + 1);
if ((newLen - tagLen) < 0) {
// If the buffer is not long enough to contain the padding plus
// a MAC tag, do a dummy constant-time padding check.
//
// Note that it is a dummy check, so we won't care about what is
// the actual padding data.
checkPadding(buf, offset, len, (byte)(padLen & 0xFF));
throw new BadPaddingException("Invalid Padding length: " + padLen);
}
// The padding data should be filled with the padding length value.
int[] results = checkPadding(buf, offset + newLen,
padLen + 1, (byte)(padLen & 0xFF));
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);
}
if (results[0] != 0) { // padding data has invalid bytes
throw new BadPaddingException("Invalid TLS padding data");
}
} 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);
if (padLen > blockSize) {
throw new BadPaddingException("Invalid SSLv3 padding");
}
}
return newlen;
return newLen;
}
/*
* Position/limit is equal the removed padding.
*/
private static int removePadding(ByteBuffer bb,
int blockSize, ProtocolVersion protocolVersion)
throws BadPaddingException {
int tagLen, 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);
int padLen = bb.get(padOffset) & 0xFF;
int newLen = len - (padLen + 1);
if ((newLen - tagLen) < 0) {
// If the buffer is not long enough to contain the padding plus
// a MAC tag, do a dummy constant-time padding check.
//
// Note that it is a dummy check, so we won't care about what is
// the actual padding data.
checkPadding(bb.duplicate(), (byte)(padLen & 0xFF));
throw new BadPaddingException("Invalid Padding length: " + padLen);
}
/*
* We could zero the padding area, but not much useful
* information there.
*/
// The padding data should be filled with the padding length value.
int[] results = checkPadding(
(ByteBuffer)bb.duplicate().position(offset + newLen),
(byte)(padLen & 0xFF));
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);
}
if (results[0] != 0) { // padding data has invalid bytes
throw new BadPaddingException("Invalid TLS padding data");
}
} 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);
if (padLen > blockSize) {
throw new BadPaddingException("Invalid SSLv3 padding");
}
}
/*
* Reset buffer limit to remove padding.
*/
bb.position(offset + newlen);
bb.limit(offset + newlen);
bb.position(offset + newLen);
bb.limit(offset + newLen);
return newlen;
return newLen;
}
/*
......@@ -708,4 +779,45 @@ final class CipherBox {
boolean isCBCMode() {
return isCBCMode;
}
/**
* Is the cipher null?
*
* @return true if the cipher is null, false otherwise.
*/
boolean isNullCipher() {
return cipher == null;
}
/**
* Sanity check the length of a fragment before decryption.
*
* In CBC mode, check that the fragment length is one or multiple times
* of the block size of the cipher suite, and is at least one (one is the
* smallest size of padding in CBC mode) bigger than the tag size of the
* MAC algorithm except the explicit IV size for TLS 1.1 or later.
*
* In non-CBC mode, check that the fragment length is not less than the
* tag size of the MAC algorithm.
*
* @return true if the length of a fragment matches above requirements
*/
boolean sanityCheck(int tagLen, int fragmentLen) {
if (!isCBCMode) {
return fragmentLen >= tagLen;
}
if ((fragmentLen % blockSize) == 0) {
int minimal = tagLen + 1;
minimal = (minimal >= blockSize) ? minimal : blockSize;
if (protocolVersion.v >= ProtocolVersion.TLS11.v) {
minimal += blockSize; // plus the size of the explicit IV
}
return (fragmentLen >= minimal);
}
return false;
}
}
src/share/classes/sun/security/ssl/CipherSuite.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2002, 2013, 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
......@@ -549,9 +549,18 @@ final class CipherSuite implements Comparable<CipherSuite> {
// size of the MAC value (and MAC key) in bytes
final int size;
MacAlg(String name, int size) {
// block size of the underlying hash algorithm
final int hashBlockSize;
// minimal padding size of the underlying hash algorithm
final int minimalPaddingSize;
MacAlg(String name, int size,
int hashBlockSize, int minimalPaddingSize) {
this.name = name;
this.size = size;
this.hashBlockSize = hashBlockSize;
this.minimalPaddingSize = minimalPaddingSize;
}
/**
......@@ -596,11 +605,11 @@ final class CipherSuite implements Comparable<CipherSuite> {
new BulkCipher(CIPHER_AES, 32, 16, true);
// MACs
final static MacAlg M_NULL = new MacAlg("NULL", 0);
final static MacAlg M_MD5 = new MacAlg("MD5", 16);
final static MacAlg M_SHA = new MacAlg("SHA", 20);
final static MacAlg M_SHA256 = new MacAlg("SHA256", 32);
final static MacAlg M_SHA384 = new MacAlg("SHA384", 48);
final static MacAlg M_NULL = new MacAlg("NULL", 0, 0, 0);
final static MacAlg M_MD5 = new MacAlg("MD5", 16, 64, 9);
final static MacAlg M_SHA = new MacAlg("SHA", 20, 64, 9);
final static MacAlg M_SHA256 = new MacAlg("SHA256", 32, 64, 9);
final static MacAlg M_SHA384 = new MacAlg("SHA384", 48, 128, 17);
/**
* PRFs (PseudoRandom Function) from TLS specifications.
......
src/share/classes/sun/security/ssl/EngineInputRecord.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2013, 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
......@@ -178,91 +178,169 @@ final class EngineInputRecord extends InputRecord {
}
/*
* Verifies and removes the MAC value. Returns true if
* the MAC checks out OK.
* Pass the data down if it's internally cached, otherwise
* do it here.
*
* On entry:
* position = beginning of app/MAC data
* limit = end of MAC data.
* If internal data, data is decrypted internally.
*
* On return:
* position = beginning of app data
* limit = end of app data
* If external data(app), return a new ByteBuffer with data to
* process.
*/
boolean checkMAC(MAC signer, ByteBuffer bb) {
ByteBuffer decrypt(MAC signer,
CipherBox box, ByteBuffer bb) throws BadPaddingException {
if (internalData) {
return checkMAC(signer);
decrypt(signer, box); // MAC is checked during decryption
return tmpBB;
}
int len = signer.MAClen();
if (len == 0) { // no mac
return true;
BadPaddingException reservedBPE = null;
int tagLen = signer.MAClen();
int cipheredLength = bb.remaining();
if (!box.isNullCipher()) {
// sanity check length of the ciphertext
if (!box.sanityCheck(tagLen, cipheredLength)) {
throw new BadPaddingException(
"ciphertext sanity check failed");
}
try {
// Note that the CipherBox.decrypt() does not change
// the capacity of the buffer.
box.decrypt(bb, tagLen);
} catch (BadPaddingException bpe) {
// RFC 2246 states that decryption_failed should be used
// for this purpose. However, that allows certain attacks,
// so we just send bad record MAC. We also need to make
// sure to always check the MAC to avoid a timing attack
// for the same issue. See paper by Vaudenay et al and the
// update in RFC 4346/5246.
//
// Failover to message authentication code checking.
reservedBPE = bpe;
} finally {
bb.rewind();
}
}
/*
* Grab the original limit
*/
int lim = bb.limit();
if (tagLen != 0) {
int macOffset = bb.limit() - tagLen;
/*
* Delineate the area to apply a MAC on.
*/
int macData = lim - len;
bb.limit(macData);
// Note that although it is not necessary, we run the same MAC
// computation and comparison on the payload for both stream
// cipher and CBC block cipher.
if (bb.remaining() < tagLen) {
// negative data length, something is wrong
if (reservedBPE == null) {
reservedBPE = new BadPaddingException("bad record");
}
// set offset of the dummy MAC
macOffset = cipheredLength - tagLen;
bb.limit(cipheredLength);
}
// Run MAC computation and comparison on the payload.
if (checkMacTags(contentType(), bb, signer, false)) {
if (reservedBPE == null) {
reservedBPE = new BadPaddingException("bad record MAC");
}
}
byte[] mac = signer.compute(contentType(), bb);
// Run MAC computation and comparison on the remainder.
//
// It is only necessary for CBC block cipher. It is used to get a
// constant time of MAC computation and comparison on each record.
if (box.isCBCMode()) {
int remainingLen = calculateRemainingLen(
signer, cipheredLength, macOffset);
// NOTE: here we use the InputRecord.buf because I did not find
// an effective way to work on ByteBuffer when its capacity is
// less than remainingLen.
// NOTE: remainingLen may be bigger (less than 1 block of the
// hash algorithm of the MAC) than the cipheredLength. However,
// We won't need to worry about it because we always use a
// maximum buffer for every record. We need a change here if
// we use small buffer size in the future.
if (remainingLen > buf.length) {
// unlikely to happen, just a placehold
throw new RuntimeException(
"Internal buffer capacity error");
}
// Won't need to worry about the result on the remainder. And
// then we won't need to worry about what's actual data to
// check MAC tag on. We start the check from the header of the
// buffer so that we don't need to construct a new byte buffer.
checkMacTags(contentType(), buf, 0, remainingLen, signer, true);
}
bb.limit(macOffset);
}
// Is it a failover?
if (reservedBPE != null) {
throw reservedBPE;
}
if (len != mac.length) {
return bb.slice();
}
/*
* Run MAC computation and comparison
*
* Please DON'T change the content of the ByteBuffer parameter!
*/
private static boolean checkMacTags(byte contentType, ByteBuffer bb,
MAC signer, boolean isSimulated) {
int tagLen = signer.MAClen();
int lim = bb.limit();
int macData = lim - tagLen;
bb.limit(macData);
byte[] hash = signer.compute(contentType, bb, isSimulated);
if (hash == null || tagLen != hash.length) {
// Something is wrong with MAC implementation.
throw new RuntimeException("Internal MAC error");
}
/*
* Delineate the MAC values, position was already set
* by doing the compute above.
*
* We could zero the MAC area, but not much useful information
* there anyway.
*/
bb.position(macData);
bb.limit(lim);
try {
for (int i = 0; i < len; i++) {
if (bb.get() != mac[i]) { // No BB.equals(byte []); !
return false;
}
}
return true;
int[] results = compareMacTags(bb, hash);
return (results[0] != 0);
} finally {
/*
* Position to the data.
*/
bb.rewind();
bb.limit(macData);
}
}
/*
* Pass the data down if it's internally cached, otherwise
* do it here.
* A constant-time comparison of the MAC tags.
*
* If internal data, data is decrypted internally.
*
* If external data(app), return a new ByteBuffer with data to
* process.
* Please DON'T change the content of the ByteBuffer parameter!
*/
ByteBuffer decrypt(CipherBox box, ByteBuffer bb)
throws BadPaddingException {
private static int[] compareMacTags(ByteBuffer bb, byte[] tag) {
if (internalData) {
decrypt(box);
return tmpBB;
}
// An array of hits is used to prevent Hotspot optimization for
// the purpose of a constant-time check.
int[] results = {0, 0}; // {missed #, matched #}
box.decrypt(bb);
bb.rewind();
// The caller ensures there are enough bytes available in the buffer.
// So we won't need to check the remaining of the buffer.
for (int i = 0; i < tag.length; i++) {
if (bb.get() != tag[i]) {
results[0]++; // mismatched bytes
} else {
results[1]++; // matched bytes
}
}
return bb.slice();
return results;
}
/*
......
src/share/classes/sun/security/ssl/EngineOutputRecord.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2013, 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
......@@ -118,7 +118,7 @@ final class EngineOutputRecord extends OutputRecord {
throws IOException {
if (signer.MAClen() != 0) {
byte[] hash = signer.compute(contentType(), bb);
byte[] hash = signer.compute(contentType(), bb, false);
/*
* position was advanced to limit in compute above.
......
src/share/classes/sun/security/ssl/InputRecord.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 1996, 2008, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 2013, 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
......@@ -133,43 +133,173 @@ class InputRecord extends ByteArrayInputStream implements Record {
return handshakeHash;
}
/*
* Verify and remove the MAC ... used for all records.
*/
boolean checkMAC(MAC signer) {
int len = signer.MAClen();
if (len == 0) { // no mac
return true;
void decrypt(MAC signer, CipherBox box) throws BadPaddingException {
BadPaddingException reservedBPE = null;
int tagLen = signer.MAClen();
int cipheredLength = count - headerSize;
if (!box.isNullCipher()) {
// sanity check length of the ciphertext
if (!box.sanityCheck(tagLen, cipheredLength)) {
throw new BadPaddingException(
"ciphertext sanity check failed");
}
try {
// Note that the CipherBox.decrypt() does not change
// the capacity of the buffer.
count = headerSize +
box.decrypt(buf, headerSize, cipheredLength, tagLen);
} catch (BadPaddingException bpe) {
// RFC 2246 states that decryption_failed should be used
// for this purpose. However, that allows certain attacks,
// so we just send bad record MAC. We also need to make
// sure to always check the MAC to avoid a timing attack
// for the same issue. See paper by Vaudenay et al and the
// update in RFC 4346/5246.
//
// Failover to message authentication code checking.
reservedBPE = bpe;
}
}
int offset = count - len;
if (tagLen != 0) {
int macOffset = count - tagLen;
int contentLen = macOffset - headerSize;
// Note that although it is not necessary, we run the same MAC
// computation and comparison on the payload for both stream
// cipher and CBC block cipher.
if (contentLen < 0) {
// negative data length, something is wrong
if (reservedBPE == null) {
reservedBPE = new BadPaddingException("bad record");
}
if (offset < headerSize) {
// data length would be negative, something is wrong
return false;
// set offset of the dummy MAC
macOffset = headerSize + cipheredLength - tagLen;
contentLen = macOffset - headerSize;
}
count -= tagLen; // Set the count before any MAC checking
// exception occurs, so that the following
// process can read the actual decrypted
// content (minus the MAC) in the fragment
// if necessary.
// Run MAC computation and comparison on the payload.
if (checkMacTags(contentType(),
buf, headerSize, contentLen, signer, false)) {
if (reservedBPE == null) {
reservedBPE = new BadPaddingException("bad record MAC");
}
}
// Run MAC computation and comparison on the remainder.
//
// It is only necessary for CBC block cipher. It is used to get a
// constant time of MAC computation and comparison on each record.
if (box.isCBCMode()) {
int remainingLen = calculateRemainingLen(
signer, cipheredLength, contentLen);
// NOTE: remainingLen may be bigger (less than 1 block of the
// hash algorithm of the MAC) than the cipheredLength. However,
// We won't need to worry about it because we always use a
// maximum buffer for every record. We need a change here if
// we use small buffer size in the future.
if (remainingLen > buf.length) {
// unlikely to happen, just a placehold
throw new RuntimeException(
"Internal buffer capacity error");
}
// Won't need to worry about the result on the remainder. And
// then we won't need to worry about what's actual data to
// check MAC tag on. We start the check from the header of the
// buffer so that we don't need to construct a new byte buffer.
checkMacTags(contentType(), buf, 0, remainingLen, signer, true);
}
}
byte[] mac = signer.compute(contentType(), buf,
headerSize, offset - headerSize);
// Is it a failover?
if (reservedBPE != null) {
throw reservedBPE;
}
}
if (len != mac.length) {
/*
* Run MAC computation and comparison
*
* Please DON'T change the content of the byte buffer parameter!
*/
static boolean checkMacTags(byte contentType, byte[] buffer,
int offset, int contentLen, MAC signer, boolean isSimulated) {
int tagLen = signer.MAClen();
byte[] hash = signer.compute(
contentType, buffer, offset, contentLen, isSimulated);
if (hash == null || tagLen != hash.length) {
// Something is wrong with MAC implementation.
throw new RuntimeException("Internal MAC error");
}
for (int i = 0; i < len; i++) {
if (buf[offset + i] != mac[i]) {
return false;
int[] results = compareMacTags(buffer, offset + contentLen, hash);
return (results[0] != 0);
}
/*
* A constant-time comparison of the MAC tags.
*
* Please DON'T change the content of the byte buffer parameter!
*/
private static int[] compareMacTags(
byte[] buffer, int offset, byte[] tag) {
// An array of hits is used to prevent Hotspot optimization for
// the purpose of a constant-time check.
int[] results = {0, 0}; // {missed #, matched #}
// The caller ensures there are enough bytes available in the buffer.
// So we won't need to check the length of the buffer.
for (int i = 0; i < tag.length; i++) {
if (buffer[offset + i] != tag[i]) {
results[0]++; // mismatched bytes
} else {
results[1]++; // matched bytes
}
}
count -= len;
return true;
}
void decrypt(CipherBox box) throws BadPaddingException {
int len = count - headerSize;
count = headerSize + box.decrypt(buf, headerSize, len);
return results;
}
/*
* Calculate the length of a dummy buffer to run MAC computation
* and comparison on the remainder.
*
* The caller MUST ensure that the fullLen is not less than usedLen.
*/
static int calculateRemainingLen(
MAC signer, int fullLen, int usedLen) {
int blockLen = signer.hashBlockLen();
int minimalPaddingLen = signer.minimalPaddingLen();
// (blockLen - minimalPaddingLen) is the maximum message size of
// the last block of hash function operation. See FIPS 180-4, or
// MD5 specification.
fullLen += 13 - (blockLen - minimalPaddingLen);
usedLen += 13 - (blockLen - minimalPaddingLen);
// Note: fullLen is always not less than usedLen, and blockLen
// is always bigger than minimalPaddingLen, so we don't worry
// about negative values. 0x01 is added to the result to ensure
// that the return value is positive. The extra one byte does
// not impact the overall MAC compression function evaluations.
return 0x01 + (int)(Math.ceil(fullLen/(1.0d * blockLen)) -
Math.ceil(usedLen/(1.0d * blockLen))) * signer.hashBlockLen();
}
/*
* Well ... hello_request messages are _never_ hashed since we can't
......
src/share/classes/sun/security/ssl/MAC.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 2013, 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
......@@ -43,8 +43,8 @@ import static sun.security.ssl.CipherSuite.*;
* provide integrity protection for SSL messages. The MAC is actually
* one of several keyed hashes, as associated with the cipher suite and
* protocol version. (SSL v3.0 uses one construct, TLS uses another.)
*
* <P>NOTE: MAC computation is the only place in the SSL protocol that the
* <P>
* NOTE: MAC computation is the only place in the SSL protocol that the
* sequence number is used. It's also reset to zero with each change of
* a cipher spec, so this is the only place this state is needed.
*
......@@ -58,6 +58,9 @@ final class MAC {
// Value of the null MAC is fixed
private static final byte nullMAC[] = new byte[0];
// internal identifier for the MAC algorithm
private final MacAlg macAlg;
// stuff defined by the kind of MAC algorithm
private final int macSize;
......@@ -82,6 +85,7 @@ final class MAC {
private MAC() {
macSize = 0;
macAlg = M_NULL;
mac = null;
block = null;
}
......@@ -91,6 +95,7 @@ final class MAC {
*/
MAC(MacAlg macAlg, ProtocolVersion protocolVersion, SecretKey key)
throws NoSuchAlgorithmException, InvalidKeyException {
this.macAlg = macAlg;
this.macSize = macAlg.size;
String algorithm;
......@@ -127,6 +132,20 @@ final class MAC {
return macSize;
}
/**
* Returns the hash function block length of the MAC alorithm.
*/
int hashBlockLen() {
return macAlg.hashBlockSize;
}
/**
* Returns the hash function minimal padding length of the MAC alorithm.
*/
int minimalPaddingLen() {
return macAlg.minimalPaddingSize;
}
/**
* Computes and returns the MAC for the data in this byte array.
*
......@@ -134,9 +153,11 @@ final class MAC {
* @param buf compressed record on which the MAC is computed
* @param offset start of compressed record data
* @param len the size of the compressed record
* @param isSimulated if true, simulate the the MAC computation
*/
final byte[] compute(byte type, byte buf[], int offset, int len) {
return compute(type, null, buf, offset, len);
final byte[] compute(byte type, byte buf[],
int offset, int len, boolean isSimulated) {
return compute(type, null, buf, offset, len, isSimulated);
}
/**
......@@ -149,9 +170,10 @@ final class MAC {
* @param type record type
* @param bb a ByteBuffer in which the position and limit
* demarcate the data to be MAC'd.
* @param isSimulated if true, simulate the the MAC computation
*/
final byte[] compute(byte type, ByteBuffer bb) {
return compute(type, bb, null, 0, bb.remaining());
final byte[] compute(byte type, ByteBuffer bb, boolean isSimulated) {
return compute(type, bb, null, 0, bb.remaining(), isSimulated);
}
/**
......@@ -204,18 +226,21 @@ final class MAC {
* or buf/offset/len.
*/
private byte[] compute(byte type, ByteBuffer bb, byte[] buf,
int offset, int len) {
int offset, int len, boolean isSimulated) {
if (macSize == 0) {
return nullMAC;
}
block[BLOCK_OFFSET_TYPE] = type;
block[block.length - 2] = (byte)(len >> 8);
block[block.length - 1] = (byte)(len );
// MUST NOT increase the sequence number for a simulated computation.
if (!isSimulated) {
block[BLOCK_OFFSET_TYPE] = type;
block[block.length - 2] = (byte)(len >> 8);
block[block.length - 1] = (byte)(len );
mac.update(block);
incrementSequenceNumber();
mac.update(block);
incrementSequenceNumber();
}
// content
if (bb != null) {
......
src/share/classes/sun/security/ssl/OutputRecord.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 2013, 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
......@@ -205,7 +205,7 @@ class OutputRecord extends ByteArrayOutputStream implements Record {
}
if (signer.MAClen() != 0) {
byte[] hash = signer.compute(contentType, buf,
headerSize, count - headerSize);
headerSize, count - headerSize, false);
write(hash);
}
}
......
src/share/classes/sun/security/ssl/SSLEngineImpl.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2003, 2013, 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
......@@ -958,35 +958,15 @@ final public class SSLEngineImpl extends SSLEngine {
* throw a fatal alert if the integrity check fails.
*/
try {
decryptedBB = inputRecord.decrypt(readCipher, readBB);
decryptedBB = inputRecord.decrypt(readMAC, readCipher, readBB);
} catch (BadPaddingException e) {
// RFC 2246 states that decryption_failed should be used
// for this purpose. However, that allows certain attacks,
// so we just send bad record MAC. We also need to make
// sure to always check the MAC to avoid a timing attack
// for the same issue. See paper by Vaudenay et al.
//
// rewind the BB if necessary.
readBB.rewind();
inputRecord.checkMAC(readMAC, readBB);
// use the same alert types as for MAC failure below
byte alertType = (inputRecord.contentType() ==
Record.ct_handshake) ?
Alerts.alert_handshake_failure :
Alerts.alert_bad_record_mac;
fatal(alertType, "Invalid padding", e);
fatal(alertType, e.getMessage(), e);
}
if (!inputRecord.checkMAC(readMAC, decryptedBB)) {
if (inputRecord.contentType() == Record.ct_handshake) {
fatal(Alerts.alert_handshake_failure,
"bad handshake record MAC");
} else {
fatal(Alerts.alert_bad_record_mac, "bad record MAC");
}
}
// if (!inputRecord.decompress(c))
// fatal(Alerts.alert_decompression_failure,
......
src/share/classes/sun/security/ssl/SSLSocketImpl.java
浏览文件 @ 4190b8c4
/*
* Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 2013, 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
......@@ -986,29 +986,13 @@ final public class SSLSocketImpl extends BaseSSLSocketImpl {
* throw a fatal alert if the integrity check fails.
*/
try {
r.decrypt(readCipher);
r.decrypt(readMAC, readCipher);
} catch (BadPaddingException e) {
// RFC 2246 states that decryption_failed should be used
// for this purpose. However, that allows certain attacks,
// so we just send bad record MAC. We also need to make
// sure to always check the MAC to avoid a timing attack
// for the same issue. See paper by Vaudenay et al.
r.checkMAC(readMAC);
// use the same alert types as for MAC failure below
byte alertType = (r.contentType() == Record.ct_handshake)
? Alerts.alert_handshake_failure
: Alerts.alert_bad_record_mac;
fatal(alertType, "Invalid padding", e);
fatal(alertType, e.getMessage(), e);
}
if (!r.checkMAC(readMAC)) {
if (r.contentType() == Record.ct_handshake) {
fatal(Alerts.alert_handshake_failure,
"bad handshake record MAC");
} else {
fatal(Alerts.alert_bad_record_mac, "bad record MAC");
}
}
// if (!r.decompress(c))
// fatal(Alerts.alert_decompression_failure,
......
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