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using System ;
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using System.Collections.Concurrent ;
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using System.Globalization ;
using System.Linq ;
using System.Security.Cryptography ;
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using MediaBrowser.Common ;
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.Net ;
using MediaBrowser.Controller.QuickConnect ;
using MediaBrowser.Controller.Security ;
using MediaBrowser.Model.QuickConnect ;
using Microsoft.Extensions.Logging ;
namespace Emby.Server.Implementations.QuickConnect
{
/// <summary>
/// Quick connect implementation.
/// </summary>
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public class QuickConnectManager : IQuickConnect , IDisposable
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{
private readonly RNGCryptoServiceProvider _rng = new RNGCryptoServiceProvider ( ) ;
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private readonly ConcurrentDictionary < string , QuickConnectResult > _currentRequests = new ConcurrentDictionary < string , QuickConnectResult > ( ) ;
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private readonly IServerConfigurationManager _config ;
private readonly ILogger < QuickConnectManager > _logger ;
private readonly IAuthenticationRepository _authenticationRepository ;
private readonly IAuthorizationContext _authContext ;
private readonly IServerApplicationHost _appHost ;
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/// <summary>
/// Initializes a new instance of the <see cref="QuickConnectManager"/> class.
/// Should only be called at server startup when a singleton is created.
/// </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>
/// <param name="authContext">Authentication context.</param>
/// <param name="authenticationRepository">Authentication repository.</param>
public QuickConnectManager (
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IServerConfigurationManager config ,
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ILogger < QuickConnectManager > logger ,
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IServerApplicationHost appHost ,
IAuthorizationContext authContext ,
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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 ;
_authContext = authContext ;
_authenticationRepository = authenticationRepository ;
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ReloadConfiguration ( ) ;
}
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/// <inheritdoc/>
public int CodeLength { get ; set ; } = 6 ;
/// <inheritdoc/>
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public string TokenName { get ; set ; } = "QuickConnect" ;
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/// <inheritdoc/>
public QuickConnectState State { get ; private set ; } = QuickConnectState . Unavailable ;
/// <inheritdoc/>
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public int Timeout { get ; set ; } = 5 ;
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private DateTime DateActivated { get ; set ; }
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/// <inheritdoc/>
public void AssertActive ( )
{
if ( State ! = QuickConnectState . Active )
{
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throw new ArgumentException ( "Quick connect is not active on this server" ) ;
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}
}
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/// <inheritdoc/>
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public void Activate ( )
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{
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DateActivated = DateTime . UtcNow ;
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SetState ( QuickConnectState . Active ) ;
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}
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/// <inheritdoc/>
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public void SetState ( QuickConnectState newState )
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{
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_logger . LogDebug ( "Changed quick connect state from {State} to {newState}" , State , newState ) ;
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ExpireRequests ( true ) ;
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State = newState ;
_config . Configuration . QuickConnectAvailable = newState = = QuickConnectState . Available | | newState = = QuickConnectState . Active ;
_config . SaveConfiguration ( ) ;
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_logger . LogDebug ( "Configuration saved" ) ;
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}
/// <inheritdoc/>
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public QuickConnectResult TryConnect ( )
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{
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ExpireRequests ( ) ;
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if ( State ! = QuickConnectState . Active )
{
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_logger . LogDebug ( "Refusing quick connect initiation request, current state is {State}" , State ) ;
throw new AuthenticationException ( "Quick connect is not active on this server" ) ;
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}
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var code = GenerateCode ( ) ;
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var result = new QuickConnectResult ( )
{
Secret = GenerateSecureRandom ( ) ,
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DateAdded = DateTime . UtcNow ,
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Code = code
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} ;
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_currentRequests [ code ] = result ;
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return result ;
}
/// <inheritdoc/>
public QuickConnectResult CheckRequestStatus ( string secret )
{
ExpireRequests ( ) ;
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AssertActive ( ) ;
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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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}
/// <inheritdoc/>
public string GenerateCode ( )
{
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Span < byte > raw = stackalloc byte [ 4 ] ;
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int min = ( int ) Math . Pow ( 10 , CodeLength - 1 ) ;
int max = ( int ) Math . Pow ( 10 , CodeLength ) ;
uint scale = uint . MaxValue ;
while ( scale = = uint . MaxValue )
{
_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 ) ;
}
/// <inheritdoc/>
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public bool AuthorizeRequest ( Guid userId , string code )
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{
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ExpireRequests ( ) ;
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AssertActive ( ) ;
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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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}
if ( result . Authenticated )
{
throw new InvalidOperationException ( "Request is already authorized" ) ;
}
result . Authentication = Guid . NewGuid ( ) . ToString ( "N" , CultureInfo . InvariantCulture ) ;
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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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var added = result . DateAdded ? ? DateTime . UtcNow . Subtract ( TimeSpan . FromMinutes ( Timeout ) ) ;
result . DateAdded = added . Subtract ( TimeSpan . FromMinutes ( Timeout - 1 ) ) ;
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_authenticationRepository . Create ( new AuthenticationInfo
{
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AppName = TokenName ,
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AccessToken = result . Authentication ,
DateCreated = DateTime . UtcNow ,
DeviceId = _appHost . SystemId ,
DeviceName = _appHost . FriendlyName ,
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 ;
}
/// <inheritdoc/>
public int DeleteAllDevices ( Guid user )
{
var raw = _authenticationRepository . Get ( new AuthenticationInfoQuery ( )
{
DeviceId = _appHost . SystemId ,
UserId = user
} ) ;
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var tokens = raw . Items . Where ( x = > x . AppName . StartsWith ( TokenName , StringComparison . CurrentCulture ) ) ;
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var removed = 0 ;
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foreach ( var token in tokens )
{
_authenticationRepository . Delete ( token ) ;
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_logger . LogDebug ( "Deleted token {AccessToken}" , token . AccessToken ) ;
removed + + ;
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}
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return removed ;
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}
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/// <summary>
/// Dispose.
/// </summary>
public void Dispose ( )
{
Dispose ( true ) ;
GC . SuppressFinalize ( this ) ;
}
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/// <summary>
/// Dispose.
/// </summary>
/// <param name="disposing">Dispose unmanaged resources.</param>
protected virtual void Dispose ( bool disposing )
{
if ( disposing )
{
_rng ? . Dispose ( ) ;
}
}
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private string GenerateSecureRandom ( int length = 32 )
{
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Span < byte > bytes = stackalloc byte [ length ] ;
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_rng . GetBytes ( bytes ) ;
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return Hex . Encode ( bytes ) ;
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}
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/// <inheritdoc/>
public void ExpireRequests ( bool expireAll = false )
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{
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// Check if quick connect should be deactivated
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if ( State = = QuickConnectState . Active & & DateTime . UtcNow > DateActivated . AddMinutes ( Timeout ) & & ! expireAll )
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{
_logger . LogDebug ( "Quick connect time expired, deactivating" ) ;
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SetState ( QuickConnectState . Available ) ;
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expireAll = true ;
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}
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// Expire stale connection requests
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var code = string . Empty ;
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var values = _currentRequests . Values . ToList ( ) ;
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for ( int i = 0 ; i < values . Count ; i + + )
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{
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var added = values [ i ] . DateAdded ? ? DateTime . UnixEpoch ;
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if ( DateTime . UtcNow > added . AddMinutes ( Timeout ) | | expireAll )
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{
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code = values [ i ] . Code ;
_logger . LogDebug ( "Removing expired request {code}" , code ) ;
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if ( ! _currentRequests . TryRemove ( code , out _ ) )
{
_logger . LogWarning ( "Request {code} already expired" , code ) ;
}
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}
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}
}
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private void ReloadConfiguration ( )
{
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State = _config . Configuration . QuickConnectAvailable ? QuickConnectState . Available : QuickConnectState . Unavailable ;
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}
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}
}