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#20 - Validate OpCodes.

This commit is contained in:
Chris Ross 2014-10-23 10:08:14 -07:00
parent 08441efeae
commit ae77def939
2 changed files with 45 additions and 24 deletions
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57
src/Microsoft.AspNet.WebSockets.Protocol/CommonWebSocket.cs
View File

@ -4,6 +4,7 @@
using System;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
@ -302,6 +303,11 @@ namespace Microsoft.AspNet.WebSockets.Protocol
await SendErrorAbortAndThrow(WebSocketCloseStatus.ProtocolError, "Incorrect masking", cancellationToken);
}
if (!ValidateOpCode(_frameInProgress.OpCode))
{
await SendErrorAbortAndThrow(WebSocketCloseStatus.ProtocolError, "Invalid opcode: " + _frameInProgress.OpCode, cancellationToken);
}
if (_frameInProgress.IsControlFrame)
{
if (_frameBytesRemaining > 125)
@ -455,29 +461,6 @@ namespace Microsoft.AspNet.WebSockets.Protocol
return result;
}
private static bool ValidateCloseStatus(WebSocketCloseStatus closeStatus)
{
if (closeStatus < (WebSocketCloseStatus)1000 || closeStatus >= (WebSocketCloseStatus)5000)
{
return false;
}
else if (closeStatus >= (WebSocketCloseStatus)3000)
{
// 3000-3999 - Reserved for frameworks
// 4000-4999 - Reserved for private usage
return true;
}
int[] validCodes = new[] { 1000, 1001, 1002, 1003, 1007, 1008, 1009, 1010, 1011 };
foreach (var validCode in validCodes)
{
if (closeStatus == (WebSocketCloseStatus)validCode)
{
return true;
}
}
return false;
}
public async override Task CloseAsync(WebSocketCloseStatus closeStatus, string statusDescription, CancellationToken cancellationToken)
{
ThrowIfDisposed();
@ -617,6 +600,34 @@ namespace Microsoft.AspNet.WebSockets.Protocol
}
}
private bool ValidateOpCode(int opCode)
{
return Constants.OpCodes.ValidOpCodes.Contains(opCode);
}
private static bool ValidateCloseStatus(WebSocketCloseStatus closeStatus)
{
if (closeStatus < (WebSocketCloseStatus)1000 || closeStatus >= (WebSocketCloseStatus)5000)
{
return false;
}
else if (closeStatus >= (WebSocketCloseStatus)3000)
{
// 3000-3999 - Reserved for frameworks
// 4000-4999 - Reserved for private usage
return true;
}
int[] validCodes = new[] { 1000, 1001, 1002, 1003, 1007, 1008, 1009, 1010, 1011 };
foreach (var validCode in validCodes)
{
if (closeStatus == (WebSocketCloseStatus)validCode)
{
return true;
}
}
return false;
}
private async Task SendErrorAbortAndThrow(WebSocketCloseStatus error, string message, CancellationToken cancellationToken)
{
if (State == WebSocketState.Open || State == WebSocketState.CloseReceived)

12
src/Microsoft.AspNet.WebSockets.Protocol/Constants.cs
View File

@ -25,7 +25,17 @@ namespace Microsoft.AspNet.WebSockets.Protocol
public const int BinaryFrame = 0x2;
public const int CloseFrame = 0x8;
public const int PingFrame = 0x9;
public const int PongFrame = 0xA;
public const int PongFrame = 0xA;
internal static readonly int[] ValidOpCodes = new int[]
{
ContinuationFrame,
TextFrame,
BinaryFrame,
CloseFrame,
PingFrame,
PongFrame,
};
}
}
}