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140 lines
5.3 KiB
140 lines
5.3 KiB
#if MYSQL_6_10
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// Copyright © 2013, 2018, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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using System.Security.Cryptography;
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#if NETSTANDARD1_3
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using AliasText = Externals.MySql.Data.MySqlClient.Framework.NetStandard1_3;
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#else
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using AliasText = System.Text;
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#endif
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namespace Externals.MySql.Data.MySqlClient.Authentication
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{
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/// <summary>
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/// The implementation of the sha256_password authentication plugin.
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/// </summary>
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internal class Sha256AuthenticationPlugin : MySqlAuthenticationPlugin
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{
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/// <summary>
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/// The byte array representation of the public key provided by the server.
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/// </summary>
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protected byte[] rawPubkey;
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public override string PluginName => "sha256_password";
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protected override byte[] MoreData(byte[] data)
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{
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rawPubkey = data;
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byte[] buffer = GetNonLengthEncodedPassword();
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return buffer;
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}
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public override object GetPassword()
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{
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if (Settings.SslMode != MySqlSslMode.None)
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{
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byte[] passBytes = Encoding.GetBytes(Settings.Password);
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byte[] buffer = new byte[passBytes.Length + 2];
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Array.Copy(passBytes, 0, buffer, 1, passBytes.Length);
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buffer[0] = (byte)(passBytes.Length + 1);
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buffer[buffer.Length - 1] = 0x00;
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return buffer;
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}
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else
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{
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if (Settings.Password.Length == 0) return new byte[1];
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// Send RSA encrypted, since the channel is not protected.
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else if (rawPubkey == null) return new byte[] { 0x01 };
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else if (!Settings.AllowPublicKeyRetrieval)
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throw new MySqlException(Resources.RSAPublicKeyRetrievalNotEnabled);
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else
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{
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byte[] bytes = GetRsaPassword(Settings.Password, AuthenticationData, rawPubkey);
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if (bytes != null && bytes.Length == 1 && bytes[0] == 0) return null;
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return bytes;
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}
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}
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}
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private byte[] GetNonLengthEncodedPassword()
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{
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// Required for AuthChange requests.
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if (Settings.SslMode != MySqlSslMode.None)
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{
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// Send as clear text, since the channel is already encrypted.
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byte[] passBytes = Encoding.GetBytes(Settings.Password);
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byte[] buffer = new byte[passBytes.Length + 1];
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Array.Copy(passBytes, 0, buffer, 0, passBytes.Length);
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buffer[passBytes.Length] = 0;
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return buffer;
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}
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else return GetPassword() as byte[];
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}
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private byte[] GetRsaPassword(string password, byte[] seedBytes, byte[] rawPublicKey)
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{
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if (password.Length == 0) return new byte[1];
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// Obfuscate the plain text password with the session scramble.
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byte[] obfuscated = GetXor(AliasText.Encoding.Default.GetBytes(password), seedBytes);
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// Encrypt the password and send it to the server.
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#if NETSTANDARD1_3
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RSA rsa = MySqlPemReader.ConvertPemToRSAProvider(rawPublicKey);
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if (rsa == null)
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throw new MySqlException(Resources.UnableToReadRSAKey);
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return rsa.Encrypt(obfuscated, RSAEncryptionPadding.OaepSHA1);
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#else
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RSACryptoServiceProvider rsa = MySqlPemReader.ConvertPemToRSAProvider(rawPublicKey);
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if (rsa == null)
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throw new MySqlException(Resources.UnableToReadRSAKey);
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return rsa.Encrypt(obfuscated, true);
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#endif
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}
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/// <summary>
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/// Applies XOR to the byte arrays provided as input.
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/// </summary>
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/// <returns>A byte array that contains the results of the XOR operation.</returns>
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protected byte[] GetXor(byte[] src, byte[] pattern)
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{
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byte[] src2 = new byte[src.Length + 1];
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Array.Copy(src, 0, src2, 0, src.Length);
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src2[src.Length] = 0;
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byte[] result = new byte[src2.Length];
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for (int i = 0; i < src2.Length; i++)
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{
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result[i] = (byte)(src2[i] ^ (pattern[i % pattern.Length]));
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}
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return result;
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}
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}
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}
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#endif
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