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Minor fixes re:PR870, added null checks from PR876

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pull/870/head
Phallacy 6 years ago
parent 1ffd443d5a
commit 77602aff88
5 changed files with 124 additions and 98 deletions
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38
Emby.Server.Implementations/Cryptography/CryptographyProvider.cs
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@ -9,7 +9,7 @@ namespace Emby.Server.Implementations.Cryptography
{
public class CryptographyProvider : ICryptoProvider
{
private List<string> SupportedHashMethods = new List<string>();
private HashSet<string> SupportedHashMethods;
public string DefaultHashMethod => "SHA256";
private RandomNumberGenerator rng;
private int defaultiterations = 1000;
@ -17,7 +17,7 @@ namespace Emby.Server.Implementations.Cryptography
{
//Currently supported hash methods from https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.cryptoconfig?view=netcore-2.1
//there might be a better way to autogenerate this list as dotnet updates, but I couldn't find one
SupportedHashMethods = new List<string>
SupportedHashMethods = new HashSet<string>()
{
"MD5"
,"System.Security.Cryptography.MD5"
@ -71,9 +71,9 @@ namespace Emby.Server.Implementations.Cryptography
return SupportedHashMethods;
}
private byte[] PBKDF2(string method, byte[] bytes, byte[] salt)
{
using (var r = new Rfc2898DeriveBytes(bytes, salt, defaultiterations, new HashAlgorithmName(method)))
private byte[] PBKDF2(string method, byte[] bytes, byte[] salt, int iterations)
{
using (var r = new Rfc2898DeriveBytes(bytes, salt, iterations, new HashAlgorithmName(method)))
{
return r.GetBytes(32);
}
@ -102,30 +102,40 @@ namespace Emby.Server.Implementations.Cryptography
}
else
{
return PBKDF2(HashMethod, bytes, salt);
return PBKDF2(HashMethod, bytes, salt,defaultiterations);
}
}
else
{
throw new CryptographicException(String.Format("Requested hash method is not supported: {0}", HashMethod));
}
}
}
public byte[] ComputeHashWithDefaultMethod(byte[] bytes, byte[] salt)
{
return PBKDF2(DefaultHashMethod, bytes, salt);
return PBKDF2(DefaultHashMethod, bytes, salt, defaultiterations);
}
public byte[] ComputeHash(PasswordHash hash)
{
return ComputeHash(hash.Id, hash.HashBytes, hash.SaltBytes);
}
{
int iterations = defaultiterations;
if (!hash.Parameters.ContainsKey("iterations"))
{
hash.Parameters.Add("iterations", defaultiterations.ToString());
}
else
{
try { iterations = int.Parse(hash.Parameters["iterations"]); }
catch (Exception e) { iterations = defaultiterations; throw new Exception($"Couldn't successfully parse iterations value from string:{hash.Parameters["iterations"]}", e); }
}
return PBKDF2(hash.Id, hash.HashBytes, hash.SaltBytes,iterations);
}
public byte[] GenerateSalt()
{
byte[] salt = new byte[8];
byte[] salt = new byte[64];
rng.GetBytes(salt);
return salt;
}
}
}
}

32
Emby.Server.Implementations/Data/SqliteUserRepository.cs
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@ -55,6 +55,7 @@ namespace Emby.Server.Implementations.Data
{
TryMigrateToLocalUsersTable(connection);
}
RemoveEmptyPasswordHashes();
}
}
@ -73,6 +74,37 @@ namespace Emby.Server.Implementations.Data
}
}
private void RemoveEmptyPasswordHashes()
{
foreach (var user in RetrieveAllUsers())
{
// If the user password is the sha1 hash of the empty string, remove it
if (!string.Equals(user.Password, "DA39A3EE5E6B4B0D3255BFEF95601890AFD80709") || !string.Equals(user.Password, "$SHA1$DA39A3EE5E6B4B0D3255BFEF95601890AFD80709"))
{
continue;
}
user.Password = null;
var serialized = _jsonSerializer.SerializeToBytes(user);
using (WriteLock.Write())
using (var connection = CreateConnection())
{
connection.RunInTransaction(db =>
{
using (var statement = db.PrepareStatement("update LocalUsersv2 set data=@data where Id=@InternalId"))
{
statement.TryBind("@InternalId", user.InternalId);
statement.TryBind("@data", serialized);
statement.MoveNext();
}
}, TransactionMode);
}
}
}
/// <summary>
/// Save a user in the repo
/// </summary>

71
Emby.Server.Implementations/Library/DefaultAuthenticationProvider.cs
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@ -36,32 +36,27 @@ namespace Emby.Server.Implementations.Library
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);
PasswordHash readyHash = new PasswordHash(resolvedUser.Password);
byte[] CalculatedHash;
string CalculatedHashString;
if (_cryptographyProvider.GetSupportedHashMethods().Any(i => i == ReadyHash.Id))
if (_cryptographyProvider.GetSupportedHashMethods().Any(i => i == readyHash.Id))
{
if (String.IsNullOrEmpty(ReadyHash.Salt))
if (String.IsNullOrEmpty(readyHash.Salt))
{
CalculatedHash = _cryptographyProvider.ComputeHash(ReadyHash.Id, passwordbytes);
CalculatedHash = _cryptographyProvider.ComputeHash(readyHash.Id, passwordbytes);
CalculatedHashString = BitConverter.ToString(CalculatedHash).Replace("-", string.Empty);
}
else
{
CalculatedHash = _cryptographyProvider.ComputeHash(ReadyHash.Id, passwordbytes, ReadyHash.SaltBytes);
CalculatedHash = _cryptographyProvider.ComputeHash(readyHash.Id, passwordbytes, readyHash.SaltBytes);
CalculatedHashString = BitConverter.ToString(CalculatedHash).Replace("-", string.Empty);
}
if (CalculatedHashString == ReadyHash.Hash)
if (CalculatedHashString == readyHash.Hash)
{
success = true;
//throw new Exception("Invalid username or password");
@ -69,8 +64,7 @@ namespace Emby.Server.Implementations.Library
}
else
{
success = false;
throw new Exception(String.Format("Requested crypto method not available in provider: {0}", ReadyHash.Id));
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);
@ -105,26 +99,6 @@ namespace Emby.Server.Implementations.Library
}
}
// 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));
@ -133,7 +107,7 @@ namespace Emby.Server.Implementations.Library
private bool IsPasswordEmpty(User user, string passwordHash)
{
return string.Equals(passwordHash, GetEmptyHashedString(user), StringComparison.OrdinalIgnoreCase);
return string.IsNullOrEmpty(passwordHash);
}
public Task ChangePassword(User user, string newPassword)
@ -144,7 +118,7 @@ namespace Emby.Server.Implementations.Library
if(passwordHash.Id == "SHA1" && string.IsNullOrEmpty(passwordHash.Salt))
{
passwordHash.SaltBytes = _cryptographyProvider.GenerateSalt();
passwordHash.Salt = BitConverter.ToString(passwordHash.SaltBytes).Replace("-","");
passwordHash.Salt = PasswordHash.ConvertToByteString(passwordHash.SaltBytes);
passwordHash.Id = _cryptographyProvider.DefaultHashMethod;
passwordHash.Hash = GetHashedStringChangeAuth(newPassword, passwordHash);
}else if (newPassword != null)
@ -164,19 +138,18 @@ namespace Emby.Server.Implementations.Library
public string GetPasswordHash(User user)
{
return string.IsNullOrEmpty(user.Password)
? GetEmptyHashedString(user)
: user.Password;
return user.Password;
}
public string GetEmptyHashedString(User user)
{
return GetHashedString(user, string.Empty);
return null;
}
public string GetHashedStringChangeAuth(string NewPassword, PasswordHash passwordHash)
public string GetHashedStringChangeAuth(string newPassword, PasswordHash passwordHash)
{
return BitConverter.ToString(_cryptographyProvider.ComputeHash(passwordHash.Id, Encoding.UTF8.GetBytes(NewPassword), passwordHash.SaltBytes)).Replace("-", string.Empty);
passwordHash.HashBytes = Encoding.UTF8.GetBytes(newPassword);
return PasswordHash.ConvertToByteString(_cryptographyProvider.ComputeHash(passwordHash));
}
/// <summary>
@ -184,8 +157,6 @@ namespace Emby.Server.Implementations.Library
/// </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))
{
@ -197,13 +168,15 @@ namespace Emby.Server.Implementations.Library
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);
{
//the password is modern format with PBKDF and we should take advantage of that
passwordHash.HashBytes = Encoding.UTF8.GetBytes(str);
return PasswordHash.ConvertToByteString(_cryptographyProvider.ComputeHash(passwordHash));
}
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");
{
//the password has no salt and should be called with the older method for safety
return PasswordHash.ConvertToByteString(_cryptographyProvider.ComputeHash(passwordHash.Id, Encoding.UTF8.GetBytes(str)));
}

6
Emby.Server.Implementations/Library/UserManager.cs
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@ -217,9 +217,8 @@ namespace Emby.Server.Implementations.Library
}
}
public bool IsValidUsername(string username)
public static bool IsValidUsername(string username)
{
//The old way was dumb, we should make it less dumb, lets do so.
//This is some regex that matches only on unicode "word" characters, as well as -, _ and @
//In theory this will cut out most if not all 'control' characters which should help minimize any weirdness
string UserNameRegex = "^[\\w-'._@]*$";
@ -229,8 +228,7 @@ namespace Emby.Server.Implementations.Library
private static bool IsValidUsernameCharacter(char i)
{
string UserNameRegex = "^[\\w-'._@]*$";
return Regex.IsMatch(i.ToString(), UserNameRegex);
return IsValidUsername(i.ToString());
}
public string MakeValidUsername(string username)

75
MediaBrowser.Model/Cryptography/PasswordHash.cs
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@ -16,70 +16,78 @@ namespace MediaBrowser.Model.Cryptography
public byte[] SaltBytes;
public string Hash;
public byte[] HashBytes;
public PasswordHash(string StorageString)
public PasswordHash(string storageString)
{
string[] a = StorageString.Split('$');
Id = a[1];
if (a[2].Contains("="))
string[] SplitStorageString = storageString.Split('$');
Id = SplitStorageString[1];
if (SplitStorageString[2].Contains("="))
{
foreach (string paramset in (a[2].Split(',')))
foreach (string paramset in (SplitStorageString[2].Split(',')))
{
if (!String.IsNullOrEmpty(paramset))
{
string[] fields = paramset.Split('=');
Parameters.Add(fields[0], fields[1]);
string[] fields = paramset.Split('=');
if(fields.Length == 2)
{
Parameters.Add(fields[0], fields[1]);
}
}
}
if (a.Length == 4)
if (SplitStorageString.Length == 5)
{
Salt = a[2];
SaltBytes = FromByteString(Salt);
Hash = a[3];
HashBytes = FromByteString(Hash);
Salt = SplitStorageString[3];
SaltBytes = ConvertFromByteString(Salt);
Hash = SplitStorageString[4];
HashBytes = ConvertFromByteString(Hash);
}
else
{
Salt = string.Empty;
Hash = a[3];
HashBytes = FromByteString(Hash);
Hash = SplitStorageString[3];
HashBytes = ConvertFromByteString(Hash);
}
}
else
{
if (a.Length == 4)
if (SplitStorageString.Length == 4)
{
Salt = a[2];
SaltBytes = FromByteString(Salt);
Hash = a[3];
HashBytes = FromByteString(Hash);
Salt = SplitStorageString[2];
SaltBytes = ConvertFromByteString(Salt);
Hash = SplitStorageString[3];
HashBytes = ConvertFromByteString(Hash);
}
else
{
Salt = string.Empty;
Hash = a[2];
HashBytes = FromByteString(Hash);
Hash = SplitStorageString[2];
HashBytes = ConvertFromByteString(Hash);
}
}
}
public PasswordHash(ICryptoProvider cryptoProvider2)
public PasswordHash(ICryptoProvider cryptoProvider)
{
Id = "SHA256";
SaltBytes = cryptoProvider2.GenerateSalt();
Salt = BitConverter.ToString(SaltBytes).Replace("-", "");
Id = cryptoProvider.DefaultHashMethod;
SaltBytes = cryptoProvider.GenerateSalt();
Salt = ConvertToByteString(SaltBytes);
}
private byte[] FromByteString(string ByteString)
public static byte[] ConvertFromByteString(string byteString)
{
List<byte> Bytes = new List<byte>();
for (int i = 0; i < ByteString.Length; i += 2)
for (int i = 0; i < byteString.Length; i += 2)
{
Bytes.Add(Convert.ToByte(ByteString.Substring(i, 2),16));
Bytes.Add(Convert.ToByte(byteString.Substring(i, 2),16));
}
return Bytes.ToArray();
}
}
public static string ConvertToByteString(byte[] bytes)
{
return BitConverter.ToString(bytes).Replace("-", "");
}
private string SerializeParameters()
{
string ReturnString = String.Empty;
@ -98,10 +106,15 @@ namespace MediaBrowser.Model.Cryptography
{
string OutString = "$";
OutString += Id;
if (!string.IsNullOrEmpty(SerializeParameters()))
OutString += $"${SerializeParameters()}";
string paramstring = SerializeParameters();
if (!string.IsNullOrEmpty(paramstring))
{
OutString += $"${paramstring}";
}
if (!string.IsNullOrEmpty(Salt))
{
OutString += $"${Salt}";
}
OutString += $"${Hash}";
return OutString;
}

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