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#14 - Validate reserved bits.

This commit is contained in:
Chris Ross 2014-10-22 16:26:20 -07:00
parent 207767a9b0
commit 7d11034790
2 changed files with 34 additions and 4 deletions
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32
src/Microsoft.AspNet.WebSockets.Protocol/CommonWebSocket.cs
View File

@ -221,7 +221,12 @@ namespace Microsoft.AspNet.WebSockets.Protocol
{
if (!_firstDataOpCode.HasValue)
{
throw new InvalidOperationException("A continuation can't be the first frame");
if (State == WebSocketState.Open)
{
await CloseOutputAsync(WebSocketCloseStatus.ProtocolError, "Invalid continuation frame", cancellationToken);
Abort();
}
throw new InvalidOperationException("A continuation can't be the first frame"); // TODO: WebSocketException
}
opCode = _firstDataOpCode.Value;
}
@ -256,8 +261,12 @@ namespace Microsoft.AspNet.WebSockets.Protocol
if (messageType == WebSocketMessageType.Text
&& !Utilities.TryValidateUtf8(new ArraySegment<byte>(buffer.Array, buffer.Offset, bytesToCopy), _frameInProgress.Fin, _incomingUtf8MessageState))
{
await CloseOutputAsync(WebSocketCloseStatus.InvalidPayloadData, string.Empty, cancellationToken);
throw new InvalidOperationException("An invalid UTF-8 payload was received.");
if (State == WebSocketState.Open)
{
await CloseOutputAsync(WebSocketCloseStatus.InvalidPayloadData, "Invalid UTF-8", cancellationToken);
Abort();
}
throw new InvalidOperationException("An invalid UTF-8 payload was received."); // TODO: WebSocketException
}
if (bytesToCopy == _frameBytesRemaining)
@ -292,9 +301,24 @@ namespace Microsoft.AspNet.WebSockets.Protocol
_receiveBufferBytes -= frameHeaderSize;
_frameBytesRemaining = _frameInProgress.DataLength;
if (_frameInProgress.AreReservedSet())
{
if (State == WebSocketState.Open)
{
await CloseOutputAsync(WebSocketCloseStatus.ProtocolError, "Unexpected reserved bits set", cancellationToken);
Abort();
}
throw new InvalidOperationException("Unexpected reserved bits are set."); // TODO: WebSocketException
}
if (_unmaskInput != _frameInProgress.Masked)
{
throw new InvalidOperationException("Unmasking settings out of sync with data.");
if (State == WebSocketState.Open)
{
await CloseOutputAsync(WebSocketCloseStatus.ProtocolError, "Incorrect masking", cancellationToken);
Abort();
}
throw new InvalidOperationException("Unmasking settings out of sync with data."); // TODO: WebSocketException
}
if (_frameInProgress.OpCode == Constants.OpCodes.PingFrame || _frameInProgress.OpCode == Constants.OpCodes.PongFrame)

6
src/Microsoft.AspNet.WebSockets.Protocol/FrameHeader.cs
View File

@ -209,6 +209,12 @@ namespace Microsoft.AspNet.WebSockets.Protocol
}
}
// bits 1-3.
internal bool AreReservedSet()
{
return (_header[0] & 0x70) != 0;
}
// Given the second bytes of a frame, calculate how long the whole frame header should be.
// Range 2-12 bytes
public static int CalculateFrameHeaderSize(byte b2)