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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: SessionProvider
* File: WebSessionSecMiddleware.cs
*
* WebSessionSecMiddleware.cs is part of SessionProvider which is part of the larger
* VNLib collection of libraries and utilities.
*
* SessionProvider is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* SessionProvider is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Threading.Tasks;
using System.Security.Authentication;
using System.Text.Json.Serialization;
using VNLib.Utils.Logging;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Plugins.Essentials.Middleware;
namespace VNLib.Plugins.Essentials.Sessions
{
[ConfigurationName("web")]
[MiddlewareImpl(MiddlewareImplOptions.SecurityCritical)]
internal sealed class WebSessionSecMiddleware(PluginBase plugin, IConfigScope config) : IHttpMiddleware
{
private readonly ILogProvider _log = plugin.Log.CreateScope("Session-Sec");
private readonly SecConfig _secConfig = config.Deserialze<SecConfig>();
///<inheritdoc/>
public ValueTask<FileProcessArgs> ProcessAsync(HttpEntity entity)
{
ref readonly SessionInfo session = ref entity.Session;
if (session.IsSet)
{
/*
* Check if the session was established over a secure connection,
* and if the current connection is insecure, redirect them to a
* secure connection.
*/
if (session.SecurityProcol > SslProtocols.None && !entity.IsSecure)
{
//Redirect the client to https
UriBuilder ub = new(entity.Server.RequestUri)
{
Scheme = Uri.UriSchemeHttps
};
_log.Debug("Possbile session TLS downgrade detected, redirecting {con} to secure endpoint", entity.TrustedRemoteIp);
//Redirect
entity.Redirect(RedirectType.Moved, ub.Uri);
return ValueTask.FromResult(FileProcessArgs.VirtualSkip);
}
//If session is not new, then verify it matches stored credentials
if (!session.IsNew && session.SessionType == SessionType.Web)
{
if (_secConfig.EnfoceStrictTlsProtocol)
{
//Try to prevent security downgrade attacks
if (!(session.IPMatch && session.SecurityProcol <= entity.Server.GetSslProtocol()))
{
_log.Debug("Possible TLS downgrade attack stopeed from connection {con}", entity.TrustedRemoteIp);
return ValueTask.FromResult(FileProcessArgs.Deny);
}
}
}
}
return ValueTask.FromResult(FileProcessArgs.Continue);
}
sealed class SecConfig
{
[JsonPropertyName("strict_tls_protocol")]
public bool EnfoceStrictTlsProtocol { get; set; } = true;
}
}
}
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