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node_modules/mysql2/lib/commands/server_handshake.js

@@ -0,0 +1,162 @@
+'use strict';
+
+const CommandCode = require('../constants/commands.js');
+const Errors = require('../constants/errors.js');
+
+const Command = require('./command.js');
+const Packets = require('../packets/index.js');
+
+class ServerHandshake extends Command {
+  constructor(args) {
+    super();
+    this.args = args;
+    /*
+    this.protocolVersion = args.protocolVersion || 10;
+    this.serverVersion   = args.serverVersion;
+    this.connectionId    = args.connectionId,
+    this.statusFlags     = args.statusFlags,
+    this.characterSet    = args.characterSet,
+    this.capabilityFlags = args.capabilityFlags || 512;
+    */
+  }
+
+  start(packet, connection) {
+    const serverHelloPacket = new Packets.Handshake(this.args);
+    this.serverHello = serverHelloPacket;
+    serverHelloPacket.setScrambleData(err => {
+      if (err) {
+        connection.emit('error', new Error('Error generating random bytes'));
+        return;
+      }
+      connection.writePacket(serverHelloPacket.toPacket(0));
+    });
+    return ServerHandshake.prototype.readClientReply;
+  }
+
+  readClientReply(packet, connection) {
+    // check auth here
+    const clientHelloReply = Packets.HandshakeResponse.fromPacket(packet);
+    // TODO check we don't have something similar already
+    connection.clientHelloReply = clientHelloReply;
+    if (this.args.authCallback) {
+      this.args.authCallback(
+        {
+          user: clientHelloReply.user,
+          database: clientHelloReply.database,
+          address: connection.stream.remoteAddress,
+          authPluginData1: this.serverHello.authPluginData1,
+          authPluginData2: this.serverHello.authPluginData2,
+          authToken: clientHelloReply.authToken
+        },
+        (err, mysqlError) => {
+          // if (err)
+          if (!mysqlError) {
+            connection.writeOk();
+          } else {
+            // TODO create constants / errorToCode
+            // 1045 = ER_ACCESS_DENIED_ERROR
+            connection.writeError({
+              message: mysqlError.message || '',
+              code: mysqlError.code || 1045
+            });
+            connection.close();
+          }
+        }
+      );
+    } else {
+      connection.writeOk();
+    }
+    return ServerHandshake.prototype.dispatchCommands;
+  }
+
+  dispatchCommands(packet, connection) {
+    // command from client to server
+    let knownCommand = true;
+    const encoding = connection.clientHelloReply.encoding;
+    const commandCode = packet.readInt8();
+    switch (commandCode) {
+      case CommandCode.QUIT:
+        if (connection.listeners('quit').length) {
+          connection.emit('quit');
+        } else {
+          connection.stream.end();
+        }
+        break;
+      case CommandCode.INIT_DB:
+        if (connection.listeners('init_db').length) {
+          const schemaName = packet.readString(undefined, encoding);
+          connection.emit('init_db', schemaName);
+        } else {
+          connection.writeOk();
+        }
+        break;
+      case CommandCode.QUERY:
+        if (connection.listeners('query').length) {
+          const query = packet.readString(undefined, encoding);
+          connection.emit('query', query);
+        } else {
+          connection.writeError({
+            code: Errors.HA_ERR_INTERNAL_ERROR,
+            message: 'No query handler'
+          });
+        }
+        break;
+      case CommandCode.FIELD_LIST:
+        if (connection.listeners('field_list').length) {
+          const table = packet.readNullTerminatedString();
+          const fields = packet.readString(undefined, encoding);
+          connection.emit('field_list', table, fields);
+        } else {
+          connection.writeError({
+            code: Errors.ER_WARN_DEPRECATED_SYNTAX,
+            message:
+              'As of MySQL 5.7.11, COM_FIELD_LIST is deprecated and will be removed in a future version of MySQL.'
+          });
+        }
+        break;
+      case CommandCode.PING:
+        if (connection.listeners('ping').length) {
+          connection.emit('ping');
+        } else {
+          connection.writeOk();
+        }
+        break;
+      default:
+        knownCommand = false;
+    }
+    if (connection.listeners('packet').length) {
+      connection.emit('packet', packet.clone(), knownCommand, commandCode);
+    } else if (!knownCommand) {
+      // eslint-disable-next-line no-console
+      console.log('Unknown command:', commandCode);
+    }
+    return ServerHandshake.prototype.dispatchCommands;
+  }
+}
+
+module.exports = ServerHandshake;
+
+// TODO: implement server-side 4.1 authentication
+/*
+4.1 authentication: (http://bazaar.launchpad.net/~mysql/mysql-server/5.5/view/head:/sql/password.c)
+
+  SERVER:  public_seed=create_random_string()
+           send(public_seed)
+
+  CLIENT:  recv(public_seed)
+           hash_stage1=sha1("password")
+           hash_stage2=sha1(hash_stage1)
+           reply=xor(hash_stage1, sha1(public_seed,hash_stage2)
+
+           // this three steps are done in scramble()
+
+           send(reply)
+
+
+  SERVER:  recv(reply)
+           hash_stage1=xor(reply, sha1(public_seed,hash_stage2))
+           candidate_hash2=sha1(hash_stage1)
+           check(candidate_hash2==hash_stage2)
+
+server stores sha1(sha1(password)) ( hash_stag2)
+*/