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224 lines
7.6 KiB
C#
224 lines
7.6 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Globalization;
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using System.Linq;
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using System.Security.Cryptography;
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Controller;
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using MediaBrowser.Controller.Authentication;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.QuickConnect;
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using MediaBrowser.Controller.Security;
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using MediaBrowser.Model.QuickConnect;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.QuickConnect
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{
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/// <summary>
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/// Quick connect implementation.
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/// </summary>
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public class QuickConnectManager : IQuickConnect, IDisposable
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{
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/// <summary>
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/// The name of internal access tokens.
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/// </summary>
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private const string TokenName = "QuickConnect";
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/// <summary>
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/// The length of user facing codes.
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/// </summary>
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private const int CodeLength = 6;
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/// <summary>
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/// The time (in minutes) that the quick connect token is valid.
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/// </summary>
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private const int Timeout = 10;
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private readonly RNGCryptoServiceProvider _rng = new();
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private readonly ConcurrentDictionary<string, QuickConnectResult> _currentRequests = new();
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private readonly IServerConfigurationManager _config;
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private readonly ILogger<QuickConnectManager> _logger;
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private readonly IServerApplicationHost _appHost;
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private readonly IAuthenticationRepository _authenticationRepository;
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/// <summary>
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/// Initializes a new instance of the <see cref="QuickConnectManager"/> class.
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/// Should only be called at server startup when a singleton is created.
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/// </summary>
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/// <param name="config">Configuration.</param>
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/// <param name="logger">Logger.</param>
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/// <param name="appHost">Application host.</param>
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/// <param name="authenticationRepository">Authentication repository.</param>
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public QuickConnectManager(
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IServerConfigurationManager config,
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ILogger<QuickConnectManager> logger,
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IServerApplicationHost appHost,
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IAuthenticationRepository authenticationRepository)
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{
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_config = config;
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_logger = logger;
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_appHost = appHost;
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_authenticationRepository = authenticationRepository;
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}
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/// <inheritdoc />
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public bool IsEnabled => _config.Configuration.QuickConnectAvailable;
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/// <summary>
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/// Assert that quick connect is currently active and throws an exception if it is not.
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/// </summary>
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private void AssertActive()
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{
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if (!IsEnabled)
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{
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throw new AuthenticationException("Quick connect is not active on this server");
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}
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}
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/// <inheritdoc/>
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public QuickConnectResult TryConnect()
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{
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AssertActive();
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ExpireRequests();
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var secret = GenerateSecureRandom();
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var code = GenerateCode();
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var result = new QuickConnectResult(secret, code, DateTime.UtcNow);
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_currentRequests[code] = result;
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return result;
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}
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/// <inheritdoc/>
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public QuickConnectResult CheckRequestStatus(string secret)
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{
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AssertActive();
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ExpireRequests();
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string code = _currentRequests.Where(x => x.Value.Secret == secret).Select(x => x.Value.Code).DefaultIfEmpty(string.Empty).First();
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if (!_currentRequests.TryGetValue(code, out QuickConnectResult? result))
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{
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throw new ResourceNotFoundException("Unable to find request with provided secret");
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}
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return result;
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}
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/// <summary>
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/// Generates a short code to display to the user to uniquely identify this request.
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/// </summary>
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/// <returns>A short, unique alphanumeric string.</returns>
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private string GenerateCode()
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{
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Span<byte> raw = stackalloc byte[4];
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int min = (int)Math.Pow(10, CodeLength - 1);
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int max = (int)Math.Pow(10, CodeLength);
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uint scale = uint.MaxValue;
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while (scale == uint.MaxValue)
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{
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_rng.GetBytes(raw);
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scale = BitConverter.ToUInt32(raw);
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}
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int code = (int)(min + ((max - min) * (scale / (double)uint.MaxValue)));
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return code.ToString(CultureInfo.InvariantCulture);
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}
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/// <inheritdoc/>
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public bool AuthorizeRequest(Guid userId, string code)
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{
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AssertActive();
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ExpireRequests();
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if (!_currentRequests.TryGetValue(code, out QuickConnectResult? result))
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{
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throw new ResourceNotFoundException("Unable to find request");
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}
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if (result.Authenticated)
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{
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throw new InvalidOperationException("Request is already authorized");
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}
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var token = Guid.NewGuid();
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result.Authentication = token;
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// Change the time on the request so it expires one minute into the future. It can't expire immediately as otherwise some clients wouldn't ever see that they have been authenticated.
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result.DateAdded = DateTime.Now.Add(TimeSpan.FromMinutes(1));
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_authenticationRepository.Create(new AuthenticationInfo
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{
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AppName = TokenName,
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AccessToken = token.ToString("N", CultureInfo.InvariantCulture),
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DateCreated = DateTime.UtcNow,
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DeviceId = _appHost.SystemId,
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DeviceName = _appHost.FriendlyName,
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AppVersion = _appHost.ApplicationVersionString,
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UserId = userId
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});
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_logger.LogDebug("Authorizing device with code {Code} to login as user {userId}", code, userId);
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return true;
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}
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/// <summary>
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/// Dispose.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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/// <summary>
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/// Dispose.
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/// </summary>
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/// <param name="disposing">Dispose unmanaged resources.</param>
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protected virtual void Dispose(bool disposing)
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{
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if (disposing)
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{
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_rng.Dispose();
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}
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}
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private string GenerateSecureRandom(int length = 32)
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{
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Span<byte> bytes = stackalloc byte[length];
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_rng.GetBytes(bytes);
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return Convert.ToHexString(bytes);
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}
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/// <summary>
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/// Expire quick connect requests that are over the time limit. If <paramref name="expireAll"/> is true, all requests are unconditionally expired.
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/// </summary>
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/// <param name="expireAll">If true, all requests will be expired.</param>
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private void ExpireRequests(bool expireAll = false)
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{
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// All requests before this timestamp have expired
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var minTime = DateTime.UtcNow.AddMinutes(-Timeout);
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// Expire stale connection requests
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foreach (var (_, currentRequest) in _currentRequests)
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{
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if (expireAll || currentRequest.DateAdded < minTime)
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{
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var code = currentRequest.Code;
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_logger.LogDebug("Removing expired request {Code}", code);
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if (!_currentRequests.TryRemove(code, out _))
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{
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_logger.LogWarning("Request {Code} already expired", code);
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}
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}
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}
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}
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}
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}
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