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node_modules/mysql2/lib/commands/client_handshake.js

@@ -0,0 +1,187 @@
+'use strict';
+
+const Command = require('./command.js');
+const Packets = require('../packets/index.js');
+const ClientConstants = require('../constants/client.js');
+const CharsetToEncoding = require('../constants/charset_encodings.js');
+const auth41 = require('../auth_41.js');
+
+function flagNames(flags) {
+  const res = [];
+  for (const c in ClientConstants) {
+    if (flags & ClientConstants[c]) {
+      res.push(c.replace(/_/g, ' ').toLowerCase());
+    }
+  }
+  return res;
+}
+
+class ClientHandshake extends Command {
+  constructor(clientFlags) {
+    super();
+    this.handshake = null;
+    this.clientFlags = clientFlags;
+  }
+
+  start() {
+    return ClientHandshake.prototype.handshakeInit;
+  }
+
+  sendSSLRequest(connection) {
+    const sslRequest = new Packets.SSLRequest(
+      this.clientFlags,
+      connection.config.charsetNumber
+    );
+    connection.writePacket(sslRequest.toPacket());
+  }
+
+  sendCredentials(connection) {
+    if (connection.config.debug) {
+      // eslint-disable-next-line
+      console.log(
+        'Sending handshake packet: flags:%d=(%s)',
+        this.clientFlags,
+        flagNames(this.clientFlags).join(', ')
+      );
+    }
+    this.user = connection.config.user;
+    this.password = connection.config.password;
+    this.passwordSha1 = connection.config.passwordSha1;
+    this.database = connection.config.database;
+    this.autPluginName = this.handshake.autPluginName;
+    const handshakeResponse = new Packets.HandshakeResponse({
+      flags: this.clientFlags,
+      user: this.user,
+      database: this.database,
+      password: this.password,
+      passwordSha1: this.passwordSha1,
+      charsetNumber: connection.config.charsetNumber,
+      authPluginData1: this.handshake.authPluginData1,
+      authPluginData2: this.handshake.authPluginData2,
+      compress: connection.config.compress,
+      connectAttributes: connection.config.connectAttributes
+    });
+    connection.writePacket(handshakeResponse.toPacket());
+  }
+
+  calculateNativePasswordAuthToken(authPluginData) {
+    // TODO: dont split into authPluginData1 and authPluginData2, instead join when 1 & 2 received
+    const authPluginData1 = authPluginData.slice(0, 8);
+    const authPluginData2 = authPluginData.slice(8, 20);
+    let authToken;
+    if (this.passwordSha1) {
+      authToken = auth41.calculateTokenFromPasswordSha(
+        this.passwordSha1,
+        authPluginData1,
+        authPluginData2
+      );
+    } else {
+      authToken = auth41.calculateToken(
+        this.password,
+        authPluginData1,
+        authPluginData2
+      );
+    }
+    return authToken;
+  }
+
+  handshakeInit(helloPacket, connection) {
+    this.on('error', e => {
+      connection._fatalError = e;
+      connection._protocolError = e;
+    });
+    this.handshake = Packets.Handshake.fromPacket(helloPacket);
+    if (connection.config.debug) {
+      // eslint-disable-next-line
+      console.log(
+        'Server hello packet: capability flags:%d=(%s)',
+        this.handshake.capabilityFlags,
+        flagNames(this.handshake.capabilityFlags).join(', ')
+      );
+    }
+    connection.serverCapabilityFlags = this.handshake.capabilityFlags;
+    connection.serverEncoding = CharsetToEncoding[this.handshake.characterSet];
+    connection.connectionId = this.handshake.connectionId;
+    const serverSSLSupport =
+      this.handshake.capabilityFlags & ClientConstants.SSL;
+    // use compression only if requested by client and supported by server
+    connection.config.compress =
+      connection.config.compress &&
+      this.handshake.capabilityFlags & ClientConstants.COMPRESS;
+    this.clientFlags = this.clientFlags | connection.config.compress;
+    if (connection.config.ssl) {
+      // client requires SSL but server does not support it
+      if (!serverSSLSupport) {
+        const err = new Error('Server does not support secure connnection');
+        err.code = 'HANDSHAKE_NO_SSL_SUPPORT';
+        err.fatal = true;
+        this.emit('error', err);
+        return false;
+      }
+      // send ssl upgrade request and immediately upgrade connection to secure
+      this.clientFlags |= ClientConstants.SSL;
+      this.sendSSLRequest(connection);
+      connection.startTLS(err => {
+        // after connection is secure
+        if (err) {
+          // SSL negotiation error are fatal
+          err.code = 'HANDSHAKE_SSL_ERROR';
+          err.fatal = true;
+          this.emit('error', err);
+          return;
+        }
+        // rest of communication is encrypted
+        this.sendCredentials(connection);
+      });
+    } else {
+      this.sendCredentials(connection);
+    }
+    return ClientHandshake.prototype.handshakeResult;
+  }
+
+  handshakeResult(packet, connection) {
+    const marker = packet.peekByte();
+    if (marker === 0xfe || marker === 1) {
+      const authSwitch = require('./auth_switch');
+      try {
+        if (marker === 1) {
+          authSwitch.authSwitchRequestMoreData(packet, connection, this);
+        } else {
+          authSwitch.authSwitchRequest(packet, connection, this);
+        }
+        return ClientHandshake.prototype.handshakeResult;
+      } catch (err) {
+        if (this.onResult) {
+          this.onResult(err);
+        } else {
+          connection.emit('error', err);
+        }
+        return null;
+      }
+    }
+    if (marker !== 0) {
+      const err = new Error('Unexpected packet during handshake phase');
+      if (this.onResult) {
+        this.onResult(err);
+      } else {
+        connection.emit('error', err);
+      }
+      return null;
+    }
+    // this should be called from ClientHandshake command only
+    // and skipped when called from ChangeUser command
+    if (!connection.authorized) {
+      connection.authorized = true;
+      if (connection.config.compress) {
+        const enableCompression = require('../compressed_protocol.js')
+          .enableCompression;
+        enableCompression(connection);
+      }
+    }
+    if (this.onResult) {
+      this.onResult(null);
+    }
+    return null;
+  }
+}
+module.exports = ClientHandshake;