apewer-dotnet/Apewer.Source/Externals/MySql.Data-6.10.9/MySqlClient/Authentication/Sha256AuthenticationPlugin.cs

#if MYSQL_6_10

// Copyright © 2013, 2018, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Security.Cryptography;
#if NETSTANDARD1_3
using AliasText = Externals.MySql.Data.MySqlClient.Framework.NetStandard1_3;
#else
using AliasText = System.Text;
#endif

namespace Externals.MySql.Data.MySqlClient.Authentication
{
    /// <summary>
    /// The implementation of the sha256_password authentication plugin.
    /// </summary>
    internal class Sha256AuthenticationPlugin : MySqlAuthenticationPlugin
    {
        /// <summary>
        /// The byte array representation of the public key provided by the server.
        /// </summary>
        protected byte[] rawPubkey;

        public override string PluginName => "sha256_password";

        protected override byte[] MoreData(byte[] data)
        {
            rawPubkey = data;
            byte[] buffer = GetNonLengthEncodedPassword();
            return buffer;
        }

        public override object GetPassword()
        {
            if (Settings.SslMode != MySqlSslMode.None)
            {
                byte[] passBytes = Encoding.GetBytes(Settings.Password);
                byte[] buffer = new byte[passBytes.Length + 2];
                Array.Copy(passBytes, 0, buffer, 1, passBytes.Length);
                buffer[0] = (byte)(passBytes.Length + 1);
                buffer[buffer.Length - 1] = 0x00;
                return buffer;
            }
            else
            {
                if (Settings.Password.Length == 0) return new byte[1];
                // Send RSA encrypted, since the channel is not protected.
                else if (rawPubkey == null) return new byte[] { 0x01 };
                else if (!Settings.AllowPublicKeyRetrieval)
                    throw new MySqlException(Resources.RSAPublicKeyRetrievalNotEnabled);
                else
                {
                    byte[] bytes = GetRsaPassword(Settings.Password, AuthenticationData, rawPubkey);
                    if (bytes != null && bytes.Length == 1 && bytes[0] == 0) return null;
                    return bytes;
                }
            }
        }

        private byte[] GetNonLengthEncodedPassword()
        {
            // Required for AuthChange requests.
            if (Settings.SslMode != MySqlSslMode.None)
            {
                // Send as clear text, since the channel is already encrypted.
                byte[] passBytes = Encoding.GetBytes(Settings.Password);
                byte[] buffer = new byte[passBytes.Length + 1];
                Array.Copy(passBytes, 0, buffer, 0, passBytes.Length);
                buffer[passBytes.Length] = 0;
                return buffer;
            }
            else return GetPassword() as byte[];
        }

        private byte[] GetRsaPassword(string password, byte[] seedBytes, byte[] rawPublicKey)
        {
            if (password.Length == 0) return new byte[1];

            // Obfuscate the plain text password with the session scramble.
            byte[] obfuscated = GetXor(AliasText.Encoding.Default.GetBytes(password), seedBytes);

            // Encrypt the password and send it to the server.
#if NETSTANDARD1_3
      RSA rsa = MySqlPemReader.ConvertPemToRSAProvider(rawPublicKey);
      if (rsa == null)
        throw new MySqlException(Resources.UnableToReadRSAKey);
      return rsa.Encrypt(obfuscated, RSAEncryptionPadding.OaepSHA1);
#else
            RSACryptoServiceProvider rsa = MySqlPemReader.ConvertPemToRSAProvider(rawPublicKey);
            if (rsa == null)
                throw new MySqlException(Resources.UnableToReadRSAKey);

            return rsa.Encrypt(obfuscated, true);
#endif
        }

        /// <summary>
        /// Applies XOR to the byte arrays provided as input.
        /// </summary>
        /// <returns>A byte array that contains the results of the XOR operation.</returns>
        protected byte[] GetXor(byte[] src, byte[] pattern)
        {
            byte[] src2 = new byte[src.Length + 1];
            Array.Copy(src, 0, src2, 0, src.Length);
            src2[src.Length] = 0;
            byte[] result = new byte[src2.Length];
            for (int i = 0; i < src2.Length; i++)
            {
                result[i] = (byte)(src2[i] ^ (pattern[i % pattern.Length]));
            }
            return result;
        }
    }
}

#endif