#if MYSQL_6_9 // Copyright © 2012, Oracle and/or its affiliates. All rights reserved. // // MySQL Connector/NET is licensed under the terms of the GPLv2 // , 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 // . // // 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.IO; using System; using Externals.MySql.Data.MySqlClient.Properties; using Externals.MySql.Data.Common; using System.Text; using System.Diagnostics; namespace Externals.MySql.Data.MySqlClient.Authentication { internal abstract class MySqlAuthenticationPlugin { private NativeDriver driver; protected byte[] AuthenticationData; /// /// This is a factory method that is used only internally. It creates an auth plugin based on the method type /// internal static MySqlAuthenticationPlugin GetPlugin(string method, NativeDriver driver, byte[] authData) { if (method == "mysql_old_password") { driver.Close(true); throw new MySqlException(Resources.OldPasswordsNotSupported); } MySqlAuthenticationPlugin plugin = AuthenticationPluginManager.GetPlugin(method); if (plugin == null) throw new MySqlException(String.Format(Resources.UnknownAuthenticationMethod, method)); plugin.driver = driver; plugin.SetAuthData(authData); return plugin; } protected MySqlConnectionStringBuilder Settings { get { return driver.Settings; } } protected Version ServerVersion { get { return new Version(driver.Version.Major, driver.Version.Minor, driver.Version.Build); } } internal ClientFlags Flags { get { return driver.Flags; } } protected Encoding Encoding { get { return driver.Encoding; } } protected virtual void SetAuthData(byte[] data) { AuthenticationData = data; } protected virtual void CheckConstraints() { } protected virtual void AuthenticationFailed(Exception ex) { string msg = String.Format(Resources.AuthenticationFailed, Settings.Server, GetUsername(), PluginName, ex.Message); throw new MySqlException(msg, ex); } protected virtual void AuthenticationSuccessful() { } protected virtual byte[] MoreData(byte[] data) { return null; } internal void Authenticate(bool reset) { CheckConstraints(); MySqlPacket packet = driver.Packet; // send auth response packet.WriteString(GetUsername()); // now write the password WritePassword(packet); if ((Flags & ClientFlags.CONNECT_WITH_DB) != 0 || reset) { if (!String.IsNullOrEmpty(Settings.Database)) packet.WriteString(Settings.Database); } if (reset) packet.WriteInteger(8, 2); if ((Flags & ClientFlags.PLUGIN_AUTH) != 0) packet.WriteString(PluginName); driver.SetConnectAttrs(); driver.SendPacket(packet); //read server response packet = ReadPacket(); byte[] b = packet.Buffer; if (b[0] == 0xfe) { if (packet.IsLastPacket) { driver.Close(true); throw new MySqlException( Resources.OldPasswordsNotSupported ); } else { HandleAuthChange(packet); } } driver.ReadOk(false); AuthenticationSuccessful(); } private void WritePassword(MySqlPacket packet) { bool secure = (Flags & ClientFlags.SECURE_CONNECTION) != 0; object password = GetPassword(); if (password is string) { if (secure) packet.WriteLenString((string)password); else packet.WriteString((string)password); } else if (password == null) packet.WriteByte(0); else if (password is byte[]) packet.Write(password as byte[]); else throw new MySqlException("Unexpected password format: " + password.GetType()); } private MySqlPacket ReadPacket() { try { MySqlPacket p = driver.ReadPacket(); return p; } catch (MySqlException ex) { // make sure this is an auth failed ex AuthenticationFailed(ex); return null; } } private void HandleAuthChange(MySqlPacket packet) { byte b = packet.ReadByte(); Debug.Assert(b == 0xfe); string method = packet.ReadString(); byte[] authData = new byte[packet.Length - packet.Position]; Array.Copy(packet.Buffer, packet.Position, authData, 0, authData.Length); MySqlAuthenticationPlugin plugin = MySqlAuthenticationPlugin.GetPlugin(method, driver, authData); plugin.AuthenticationChange(); } private void AuthenticationChange() { MySqlPacket packet = driver.Packet; packet.Clear(); byte[] moreData = MoreData(null); while (moreData != null && moreData.Length > 0) { packet.Clear(); packet.Write(moreData); driver.SendPacket(packet); packet = ReadPacket(); byte prefixByte = packet.Buffer[0]; if (prefixByte != 1) return; // a prefix of 0x01 means need more auth data byte[] responseData = new byte[packet.Length - 1]; Array.Copy(packet.Buffer, 1, responseData, 0, responseData.Length); moreData = MoreData(responseData); } // we get here if MoreData returned null but the last packet read was a more data packet ReadPacket(); } public abstract string PluginName { get; } public virtual string GetUsername() { return Settings.UserID; } public virtual object GetPassword() { return null; } } } #endif