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Merge pull request #1229 from voodoos/cleanup/SocketSharp

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Cleaning WebSocketSharp continued
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Bond-009 2019-05-09 17:16:51 +02:00 committed by GitHub
commit d9c159122f
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3 changed files with 27 additions and 116 deletions
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112
Emby.Server.Implementations/SocketSharp/WebSocketSharpRequest.cs
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@ -4,6 +4,7 @@ using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
using MediaBrowser.Common.Net;
using MediaBrowser.Model.Services;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Extensions;
@ -38,16 +39,9 @@ namespace Emby.Server.Implementations.SocketSharp
public string RawUrl => request.GetEncodedPathAndQuery();
public string AbsoluteUri => request.GetDisplayUrl().TrimEnd('/');
// Header[name] returns "" when undefined
public string XForwardedFor
=> StringValues.IsNullOrEmpty(request.Headers["X-Forwarded-For"]) ? null : request.Headers["X-Forwarded-For"].ToString();
public int? XForwardedPort
=> StringValues.IsNullOrEmpty(request.Headers["X-Forwarded-Port"]) ? (int?)null : int.Parse(request.Headers["X-Forwarded-Port"], CultureInfo.InvariantCulture);
public string XForwardedProtocol => StringValues.IsNullOrEmpty(request.Headers["X-Forwarded-Proto"]) ? null : request.Headers["X-Forwarded-Proto"].ToString();
public string XRealIp => StringValues.IsNullOrEmpty(request.Headers["X-Real-IP"]) ? null : request.Headers["X-Real-IP"].ToString();
private string GetHeader(string name) => request.Headers[name].ToString();
private string remoteIp;
public string RemoteIp
@ -59,101 +53,27 @@ namespace Emby.Server.Implementations.SocketSharp
return remoteIp;
}
var temp = CheckBadChars(XForwardedFor.AsSpan());
if (temp.Length != 0)
IPAddress ip;
// "Real" remote ip might be in X-Forwarded-For of X-Real-Ip
// (if the server is behind a reverse proxy for example)
if (!IPAddress.TryParse(GetHeader(CustomHeaderNames.XForwardedFor), out ip))
{
return remoteIp = temp.ToString();
if (!IPAddress.TryParse(GetHeader(CustomHeaderNames.XRealIP), out ip))
{
ip = request.HttpContext.Connection.RemoteIpAddress;
}
}
temp = CheckBadChars(XRealIp.AsSpan());
if (temp.Length != 0)
{
return remoteIp = NormalizeIp(temp).ToString();
}
return remoteIp = NormalizeIp(request.HttpContext.Connection.RemoteIpAddress.ToString().AsSpan()).ToString();
return remoteIp = NormalizeIp(ip).ToString();
}
}
private static readonly char[] HttpTrimCharacters = new char[] { (char)0x09, (char)0xA, (char)0xB, (char)0xC, (char)0xD, (char)0x20 };
// CheckBadChars - throws on invalid chars to be not found in header name/value
internal static ReadOnlySpan<char> CheckBadChars(ReadOnlySpan<char> name)
private static IPAddress NormalizeIp(IPAddress ip)
{
if (name.Length == 0)
if (ip.IsIPv4MappedToIPv6)
{
return name;
}
// VALUE check
// Trim spaces from both ends
name = name.Trim(HttpTrimCharacters);
// First, check for correctly formed multi-line value
// Second, check for absence of CTL characters
int crlf = 0;
for (int i = 0; i < name.Length; ++i)
{
char c = (char)(0x000000ff & (uint)name[i]);
switch (crlf)
{
case 0:
if (c == '\r')
{
crlf = 1;
}
else if (c == '\n')
{
// Technically this is bad HTTP. But it would be a breaking change to throw here.
// Is there an exploit?
crlf = 2;
}
else if (c == 127 || (c < ' ' && c != '\t'))
{
throw new ArgumentException("net_WebHeaderInvalidControlChars", nameof(name));
}
break;
case 1:
if (c == '\n')
{
crlf = 2;
break;
}
throw new ArgumentException("net_WebHeaderInvalidCRLFChars", nameof(name));
case 2:
if (c == ' ' || c == '\t')
{
crlf = 0;
break;
}
throw new ArgumentException("net_WebHeaderInvalidCRLFChars", nameof(name));
}
}
if (crlf != 0)
{
throw new ArgumentException("net_WebHeaderInvalidCRLFChars", nameof(name));
}
return name;
}
private ReadOnlySpan<char> NormalizeIp(ReadOnlySpan<char> ip)
{
if (ip.Length != 0 && !ip.IsWhiteSpace())
{
// Handle ipv4 mapped to ipv6
const string srch = "::ffff:";
var index = ip.IndexOf(srch.AsSpan(), StringComparison.OrdinalIgnoreCase);
if (index == 0)
{
ip = ip.Slice(srch.Length);
}
return ip.MapToIPv4();
}
return ip;

11
MediaBrowser.Common/Net/CustomHeaderNames.cs Normal file
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@ -0,0 +1,11 @@
namespace MediaBrowser.Common.Net
{
public static class CustomHeaderNames
{
// Other Headers
public const string XForwardedFor = "X-Forwarded-For";
public const string XForwardedPort = "X-Forwarded-Port";
public const string XForwardedProto = "X-Forwarded-Proto";
public const string XRealIP = "X-Real-IP";
}
}

20
MediaBrowser.Model/Services/IHttpRequest.cs
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@ -7,26 +7,6 @@ namespace MediaBrowser.Model.Services
/// </summary>
string HttpMethod { get; }
/// <summary>
/// The IP Address of the X-Forwarded-For header, null if null or empty
/// </summary>
string XForwardedFor { get; }
/// <summary>
/// The Port number of the X-Forwarded-Port header, null if null or empty
/// </summary>
int? XForwardedPort { get; }
/// <summary>
/// The http or https scheme of the X-Forwarded-Proto header, null if null or empty
/// </summary>
string XForwardedProtocol { get; }
/// <summary>
/// The value of the X-Real-IP header, null if null or empty
/// </summary>
string XRealIp { get; }
/// <summary>
/// The value of the Accept HTTP Request Header
/// </summary>