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using System;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MediaBrowser.Controller.Authentication;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Model.Cryptography;
namespace Emby.Server.Implementations.Library
{
public class DefaultAuthenticationProvider : IAuthenticationProvider, IRequiresResolvedUser
{
private readonly ICryptoProvider _cryptographyProvider;
public DefaultAuthenticationProvider(ICryptoProvider crypto)
{
_cryptographyProvider = crypto;
}
public string Name => "Default";
public bool IsEnabled => true;
//This is dumb and an artifact of the backwards way auth providers were designed.
//This version of authenticate was never meant to be called, but needs to be here for interface compat
//Only the providers that don't provide local user support use this
public Task<ProviderAuthenticationResult> Authenticate(string username, string password)
{
throw new NotImplementedException();
}
//This is the verson that we need to use for local users. Because reasons.
public Task<ProviderAuthenticationResult> Authenticate(string username, string password, User resolvedUser)
{
bool success = false;
if (resolvedUser == null)
{
success = false;
throw new Exception("Invalid username or password");
}
ConvertPasswordFormat(resolvedUser);
byte[] passwordbytes = Encoding.UTF8.GetBytes(password);
if (!resolvedUser.Password.Contains("$"))
{
ConvertPasswordFormat(resolvedUser);
}
PasswordHash ReadyHash = new PasswordHash(resolvedUser.Password);
byte[] CalculatedHash;
string CalculatedHashString;
if (_cryptographyProvider.GetSupportedHashMethods().Any(i => i == ReadyHash.Id))
{
if (String.IsNullOrEmpty(ReadyHash.Salt))
{
CalculatedHash = _cryptographyProvider.ComputeHash(ReadyHash.Id, passwordbytes);
CalculatedHashString = BitConverter.ToString(CalculatedHash).Replace("-", string.Empty);
}
else
{
CalculatedHash = _cryptographyProvider.ComputeHash(ReadyHash.Id, passwordbytes, ReadyHash.SaltBytes);
CalculatedHashString = BitConverter.ToString(CalculatedHash).Replace("-", string.Empty);
}
if (CalculatedHashString == ReadyHash.Hash)
{
success = true;
//throw new Exception("Invalid username or password");
}
}
else
{
success = false;
throw new Exception(String.Format("Requested crypto method not available in provider: {0}", ReadyHash.Id));
}
//var success = string.Equals(GetPasswordHash(resolvedUser), GetHashedString(resolvedUser, password), StringComparison.OrdinalIgnoreCase);
if (!success)
{
throw new Exception("Invalid username or password");
}
return Task.FromResult(new ProviderAuthenticationResult
{
Username = username
});
}
//This allows us to move passwords forward to the newformat without breaking. They are still insecure, unsalted, and dumb before a password change
//but at least they are in the new format.
private void ConvertPasswordFormat(User user)
{
if (!string.IsNullOrEmpty(user.Password))
{
if (!user.Password.Contains("$"))
{
string hash = user.Password;
user.Password = String.Format("$SHA1${0}", hash);
}
if (user.EasyPassword != null && !user.EasyPassword.Contains("$"))
{
string hash = user.EasyPassword;
user.EasyPassword = String.Format("$SHA1${0}", hash);
}
}
}
// OLD VERSION //public Task<ProviderAuthenticationResult> Authenticate(string username, string password, User resolvedUser)
// OLD VERSION //{
// OLD VERSION // if (resolvedUser == null)
// OLD VERSION // {
// OLD VERSION // throw new Exception("Invalid username or password");
// OLD VERSION // }
// OLD VERSION //
// OLD VERSION // var success = string.Equals(GetPasswordHash(resolvedUser), GetHashedString(resolvedUser, password), StringComparison.OrdinalIgnoreCase);
// OLD VERSION //
// OLD VERSION // if (!success)
// OLD VERSION // {
// OLD VERSION // throw new Exception("Invalid username or password");
// OLD VERSION // }
// OLD VERSION //
// OLD VERSION // return Task.FromResult(new ProviderAuthenticationResult
// OLD VERSION // {
// OLD VERSION // Username = username
// OLD VERSION // });
// OLD VERSION //}
public Task<bool> HasPassword(User user)
{
var hasConfiguredPassword = !IsPasswordEmpty(user, GetPasswordHash(user));
return Task.FromResult(hasConfiguredPassword);
}
private bool IsPasswordEmpty(User user, string passwordHash)
{
return string.Equals(passwordHash, GetEmptyHashedString(user), StringComparison.OrdinalIgnoreCase);
}
public Task ChangePassword(User user, string newPassword)
{
//string newPasswordHash = null;
ConvertPasswordFormat(user);
PasswordHash passwordHash = new PasswordHash(user.Password);
if(passwordHash.Id == "SHA1" && string.IsNullOrEmpty(passwordHash.Salt))
{
passwordHash.SaltBytes = _cryptographyProvider.GenerateSalt();
passwordHash.Salt = BitConverter.ToString(passwordHash.SaltBytes).Replace("-","");
passwordHash.Id = _cryptographyProvider.DefaultHashMethod;
passwordHash.Hash = GetHashedStringChangeAuth(newPassword, passwordHash);
}else if (newPassword != null)
{
passwordHash.Hash = GetHashedString(user, newPassword);
}
if (string.IsNullOrWhiteSpace(passwordHash.Hash))
{
throw new ArgumentNullException(nameof(passwordHash.Hash));
}
user.Password = passwordHash.ToString();
return Task.CompletedTask;
}
public string GetPasswordHash(User user)
{
return string.IsNullOrEmpty(user.Password)
? GetEmptyHashedString(user)
: user.Password;
}
public string GetEmptyHashedString(User user)
{
return GetHashedString(user, string.Empty);
}
public string GetHashedStringChangeAuth(string NewPassword, PasswordHash passwordHash)
{
return BitConverter.ToString(_cryptographyProvider.ComputeHash(passwordHash.Id, Encoding.UTF8.GetBytes(NewPassword), passwordHash.SaltBytes)).Replace("-", string.Empty);
}
/// <summary>
/// Gets the hashed string.
/// </summary>
public string GetHashedString(User user, string str)
{
//This is legacy. Deprecated in the auth method.
//return BitConverter.ToString(_cryptoProvider2.ComputeSHA1(Encoding.UTF8.GetBytes(str))).Replace("-", string.Empty);
PasswordHash passwordHash;
if (String.IsNullOrEmpty(user.Password))
{
passwordHash = new PasswordHash(_cryptographyProvider);
}
else
{
ConvertPasswordFormat(user);
passwordHash = new PasswordHash(user.Password);
}
if (passwordHash.SaltBytes != null)
{
return BitConverter.ToString(_cryptographyProvider.ComputeHash(passwordHash.Id, Encoding.UTF8.GetBytes(str), passwordHash.SaltBytes)).Replace("-",string.Empty);
}
else
{
return BitConverter.ToString(_cryptographyProvider.ComputeHash(passwordHash.Id, Encoding.UTF8.GetBytes(str))).Replace("-", string.Empty);
//throw new Exception("User does not have a hash, this should not be possible");
}
}
}
}
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