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Only parse the packet length one time per packet. See #382

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This commit is contained in:
norman 2012-06-06 08:42:36 +02:00
parent 977ce4e645
commit 784722eff4
1 changed files with 61 additions and 54 deletions
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115
src/main/java/org/jboss/netty/handler/ssl/SslHandler.java
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@ -199,6 +199,8 @@ public class SslHandler extends FrameDecoder
private final SSLEngineInboundCloseFuture sslEngineCloseFuture = new SSLEngineInboundCloseFuture();
private int packetLength = -1;
/**
* Creates a new instance.
*
@ -572,73 +574,74 @@ public class SslHandler extends FrameDecoder
protected Object decode(
final ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
if (buffer.readableBytes() < 5) {
return null;
}
if (packetLength == -1) {
if (buffer.readableBytes() < 5) {
return null;
}
int packetLength = 0;
// SSLv3 or TLS - Check ContentType
boolean tls;
switch (buffer.getUnsignedByte(buffer.readerIndex())) {
case 20: // change_cipher_spec
case 21: // alert
case 22: // handshake
case 23: // application_data
tls = true;
break;
default:
// SSLv2 or bad data
tls = false;
}
// SSLv3 or TLS - Check ContentType
boolean tls;
switch (buffer.getUnsignedByte(buffer.readerIndex())) {
case 20: // change_cipher_spec
case 21: // alert
case 22: // handshake
case 23: // application_data
tls = true;
break;
default:
// SSLv2 or bad data
tls = false;
}
if (tls) {
// SSLv3 or TLS - Check ProtocolVersion
int majorVersion = buffer.getUnsignedByte(buffer.readerIndex() + 1);
if (majorVersion == 3) {
// SSLv3 or TLS
packetLength = (getShort(buffer, buffer.readerIndex() + 3) & 0xFFFF) + 5;
if (packetLength <= 5) {
if (tls) {
// SSLv3 or TLS - Check ProtocolVersion
int majorVersion = buffer.getUnsignedByte(buffer.readerIndex() + 1);
if (majorVersion == 3) {
// SSLv3 or TLS
packetLength = (getShort(buffer, buffer.readerIndex() + 3) & 0xFFFF) + 5;
if (packetLength <= 5) {
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
tls = false;
}
} else {
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
tls = false;
}
} else {
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
tls = false;
}
}
if (!tls) {
// SSLv2 or bad data - Check the version
boolean sslv2 = true;
int headerLength = (buffer.getUnsignedByte(
buffer.readerIndex()) & 0x80) != 0 ? 2 : 3;
int majorVersion = buffer.getUnsignedByte(
buffer.readerIndex() + headerLength + 1);
if (majorVersion == 2 || majorVersion == 3) {
// SSLv2
if (headerLength == 2) {
packetLength = (getShort(buffer, buffer.readerIndex()) & 0x7FFF) + 2;
if (!tls) {
// SSLv2 or bad data - Check the version
boolean sslv2 = true;
int headerLength = (buffer.getUnsignedByte(
buffer.readerIndex()) & 0x80) != 0 ? 2 : 3;
int majorVersion = buffer.getUnsignedByte(
buffer.readerIndex() + headerLength + 1);
if (majorVersion == 2 || majorVersion == 3) {
// SSLv2
if (headerLength == 2) {
packetLength = (getShort(buffer, buffer.readerIndex()) & 0x7FFF) + 2;
} else {
packetLength = (getShort(buffer, buffer.readerIndex()) & 0x3FFF) + 3;
}
if (packetLength <= headerLength) {
sslv2 = false;
}
} else {
packetLength = (getShort(buffer, buffer.readerIndex()) & 0x3FFF) + 3;
}
if (packetLength <= headerLength) {
sslv2 = false;
}
} else {
sslv2 = false;
if (!sslv2) {
// Bad data - discard the buffer and raise an exception.
SSLException e = new SSLException(
"not an SSL/TLS record: " + ChannelBuffers.hexDump(buffer));
buffer.skipBytes(buffer.readableBytes());
throw e;
}
}
if (!sslv2) {
// Bad data - discard the buffer and raise an exception.
SSLException e = new SSLException(
"not an SSL/TLS record: " + ChannelBuffers.hexDump(buffer));
buffer.skipBytes(buffer.readableBytes());
throw e;
}
assert packetLength > 0;
}
assert packetLength > 0;
if (buffer.readableBytes() < packetLength) {
return null;
@ -660,7 +663,11 @@ public class SslHandler extends FrameDecoder
// before calling the user code.
final int packetOffset = buffer.readerIndex();
buffer.skipBytes(packetLength);
return unwrap(ctx, channel, buffer, packetOffset, packetLength);
try {
return unwrap(ctx, channel, buffer, packetOffset, packetLength);
} finally {
packetLength = -1;
}
}
/**