246 lines
9.5 KiB
C#
246 lines
9.5 KiB
C#
//using Newtonsoft.Json;
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//using System.Diagnostics.CodeAnalysis;
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//using System.Security.Cryptography;
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//using System.Text;
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//namespace SimpleHttpServer.Login;
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//internal struct SerialLoginData {
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// public string passwordSalt;
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// public string extraDataSalt;
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// public string pwd;
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// public string extraData;
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// public LoginData ToPlainData() {
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// return new LoginData {
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// passwordSalt = Convert.FromBase64String(passwordSalt),
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// extraDataSalt = Convert.FromBase64String(extraDataSalt)
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// };
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// }
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//}
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//internal struct LoginData {
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// public byte[] passwordSalt;
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// public byte[] extraDataSalt;
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// public byte[] passwordHash;
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// public byte[] encryptedExtraData;
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// public SerialLoginData ToSerial() {
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// return new SerialLoginData {
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// passwordSalt = Convert.ToBase64String(passwordSalt),
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// extraDataSalt = Convert.ToBase64String(extraDataSalt),
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// pwd = Convert.ToBase64String(passwordHash),
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// extraData = Convert.ToBase64String(encryptedExtraData)
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// };
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// }
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//}
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//internal struct LoginDataProviderConfig {
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// /// <summary>
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// /// Size of the password salt and the extradata salt. So each salt will be of size <see cref="SALT_SIZE"/>.
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// /// </summary>
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// public int SALT_SIZE = 32;
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// public int KEY_LENGTH = 256 / 8;
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// public int PBKDF2_ITERATIONS = 600_000;
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// public LoginDataProviderConfig() { }
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//}
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//public class LoginProvider<TExtraData> {
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// private static readonly Func<TExtraData, byte[]> JsonSerialize = t => Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(t));
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// private static readonly Func<byte[], TExtraData> JsonDeserialize = b => JsonConvert.DeserializeObject<TExtraData>(Encoding.UTF8.GetString(b))!;
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// [ThreadStatic]
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// private static SHA256? _sha256PerThread;
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// private static SHA256 Sha256PerThread { get => _sha256PerThread ??= SHA256.Create(); }
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// private readonly LoginDataProviderConfig config;
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// private readonly ReaderWriterLockSlim ldLock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
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// private readonly string ldPath;
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// private readonly Dictionary<string, LoginData> loginDatas;
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// private Func<TExtraData, byte[]> DataSerializer = JsonSerialize;
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// private Func<byte[], TExtraData> DataDeserializer = JsonDeserialize;
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// public void SetDataSerializers(Func<TExtraData, byte[]> serializer, Func<byte[], TExtraData> deserializer) {
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// DataSerializer = serializer ?? JsonSerialize;
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// DataDeserializer = deserializer ?? JsonDeserialize;
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// }
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// public LoginProvider(string ldPath, string confPath) {
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// this.ldPath = ldPath;
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// loginDatas = LoadLoginDatas(ldPath);
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// config = LoadLoginProviderConfig(confPath);
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// }
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// private static Dictionary<string, LoginData> LoadLoginDatas(string path) {
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// Dictionary<string, SerialLoginData> tempData;
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// if (!File.Exists(path)) {
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// File.WriteAllText(path, "{}", Encoding.UTF8);
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// tempData = new();
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// } else {
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// tempData = JsonConvert.DeserializeObject<Dictionary<string, SerialLoginData>>(File.ReadAllText(path))!;
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// if (tempData == null) {
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// throw new InvalidDataException($"could not read login data from file {path}");
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// }
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// }
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// var ld = new Dictionary<string, LoginData>();
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// foreach (var pair in tempData) {
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// ld.Add(pair.Key, pair.Value.ToPlainData());
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// }
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// return ld;
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// }
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// private void SaveLoginData() {
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// var serial = new Dictionary<string, SerialLoginData>();
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// ldLock.EnterWriteLock();
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// try {
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// foreach (var pair in loginDatas) {
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// serial.Add(pair.Key, pair.Value.ToSerial());
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// }
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// } finally {
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// ldLock.ExitWriteLock();
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// }
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// File.WriteAllText(ldPath, JsonConvert.SerializeObject(serial));
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// }
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// private static LoginDataProviderConfig LoadLoginProviderConfig(string path) {
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// if (!File.Exists(path)) {
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// var conf = new LoginDataProviderConfig();
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// File.WriteAllText(path, JsonConvert.SerializeObject(conf));
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// return conf;
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// }
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// return JsonConvert.DeserializeObject<LoginDataProviderConfig>(File.ReadAllText(path));
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// }
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// public bool AddUser(string username, string password, TExtraData additional) {
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// ldLock.EnterWriteLock();
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// try {
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// if (loginDatas.ContainsKey(username)) {
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// return false;
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// }
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// var passwordSalt = RandomNumberGenerator.GetBytes(config.SALT_SIZE);
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// var extraDataSalt = RandomNumberGenerator.GetBytes(config.SALT_SIZE);
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// LoginData ld = new LoginData() {
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// passwordSalt = passwordSalt,
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// extraDataSalt = extraDataSalt,
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// passwordHash = ComputeSaltedSha256Hash(password, passwordSalt),
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// encryptedExtraData = EncryptExtraData(password, extraDataSalt, additional),
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// };
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// loginDatas.Add(username, ld);
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// SaveLoginData();
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// } finally {
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// ldLock.ExitWriteLock();
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// }
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// return true;
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// }
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// public bool RemoveUser(string username) {
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// ldLock.EnterWriteLock();
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// try {
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// var removed = loginDatas.Remove(username);
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// if (removed) {
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// SaveLoginData();
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// }
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// return removed;
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// } finally {
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// ldLock.ExitWriteLock();
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// }
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// }
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// public bool ModifyUser(string username, string newPassword, TExtraData newExtraData) {
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// ldLock.EnterWriteLock();
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// try {
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// if (!loginDatas.ContainsKey(username)) {
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// return false;
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// }
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// loginDatas.Remove(username, out var data);
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// data.passwordHash = ComputeSaltedSha256Hash(newPassword, data.passwordSalt);
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// data.encryptedExtraData = EncryptExtraData(newPassword, data.extraDataSalt, newExtraData);
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// loginDatas.Add(username, data);
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// SaveLoginData();
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// } finally {
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// ldLock.ExitWriteLock();
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// }
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// return true;
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// }
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// public bool TryAuthenticate(string username, string password, [MaybeNullWhen(false)] out TExtraData extraData) {
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// LoginData data;
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// ldLock.EnterReadLock();
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// try {
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// if (!loginDatas.TryGetValue(username, out data)) {
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// extraData = default;
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// return false;
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// }
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// } finally {
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// ldLock.ExitReadLock();
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// }
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// var hash = ComputeSaltedSha256Hash(password, data.passwordSalt);
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// if (!hash.SequenceEqual(data.passwordHash)) {
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// extraData = default;
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// return false;
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// }
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// extraData = DecryptExtraData(password, data.extraDataSalt, data.encryptedExtraData);
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// return true;
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// }
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// /// <summary>
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// /// Threadsafe as the SHA256 instance (<see cref="Sha256PerThread"/>) is per thread.
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// /// </summary>
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// /// <param name="data"></param>
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// /// <param name="salt"></param>
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// /// <returns></returns>
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// private static byte[] ComputeSaltedSha256Hash(string data, byte[] salt) {
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// var dataBytes = Encoding.UTF8.GetBytes(data);
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// var buf = new byte[data.Length + salt.Length];
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// Buffer.BlockCopy(dataBytes, 0, buf, 0, dataBytes.Length);
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// Buffer.BlockCopy(salt, 0, buf, dataBytes.Length, salt.Length);
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// return Sha256PerThread.ComputeHash(buf);
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// }
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// private byte[] EncryptExtraData(string pwd, byte[] salt, TExtraData extraData) {
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// var pbkdf2 = new Rfc2898DeriveBytes(Encoding.UTF8.GetBytes(pwd), salt, config.PBKDF2_ITERATIONS, HashAlgorithmName.SHA256);
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// var key = pbkdf2.GetBytes(config.KEY_LENGTH / 8);
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// var plainBytes = DataSerializer(extraData);
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// using var aes = Aes.Create();
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// aes.KeySize = config.KEY_LENGTH;
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// aes.Key = key;
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// aes.Mode = CipherMode.CBC;
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// aes.Padding = PaddingMode.PKCS7;
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// ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
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// byte[] cipherBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
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// var encryptedBytes = new byte[aes.IV.Length + cipherBytes.Length];
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// Array.Copy(aes.IV, 0, encryptedBytes, 0, aes.IV.Length);
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// Array.Copy(cipherBytes, 0, encryptedBytes, aes.IV.Length, cipherBytes.Length);
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// return encryptedBytes;
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// }
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// private TExtraData DecryptExtraData(string pwd, byte[] salt, byte[] encryptedData) {
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// var pbkdf2 = new Rfc2898DeriveBytes(Encoding.UTF8.GetBytes(pwd), salt, config.PBKDF2_ITERATIONS, HashAlgorithmName.SHA256);
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// var key = pbkdf2.GetBytes(config.KEY_LENGTH / 8);
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// using var aes = Aes.Create();
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// aes.KeySize = config.KEY_LENGTH;
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// aes.Key = key;
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// aes.Mode = CipherMode.CBC;
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// aes.Padding = PaddingMode.PKCS7;
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// var iv = new byte[aes.BlockSize / 8];
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// var cipherBytes = new byte[encryptedData.Length - iv.Length];
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// Array.Copy(encryptedData, 0, iv, 0, iv.Length);
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// Array.Copy(encryptedData, iv.Length, cipherBytes, 0, cipherBytes.Length);
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// aes.IV = iv;
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// ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
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// byte[] plainBytes = decryptor.TransformFinalBlock(cipherBytes, 0, cipherBytes.Length);
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// return DataDeserializer(plainBytes);
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// }
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//}
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