tedious
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A TDS driver, for connecting to MS SQLServer databases.
170 lines (165 loc) • 28.9 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _nativeDuplexpair = _interopRequireDefault(require("native-duplexpair"));
var tls = _interopRequireWildcard(require("tls"));
var _net = require("net");
var _events = require("events");
var _message = _interopRequireDefault(require("./message"));
var _packet = require("./packet");
var _incomingMessageStream = _interopRequireDefault(require("./incoming-message-stream"));
var _outgoingMessageStream = _interopRequireDefault(require("./outgoing-message-stream"));
function _interopRequireWildcard(e, t) { if ("function" == typeof WeakMap) var r = new WeakMap(), n = new WeakMap(); return (_interopRequireWildcard = function (e, t) { if (!t && e && e.__esModule) return e; var o, i, f = { __proto__: null, default: e }; if (null === e || "object" != typeof e && "function" != typeof e) return f; if (o = t ? n : r) { if (o.has(e)) return o.get(e); o.set(e, f); } for (const t in e) "default" !== t && {}.hasOwnProperty.call(e, t) && ((i = (o = Object.defineProperty) && Object.getOwnPropertyDescriptor(e, t)) && (i.get || i.set) ? o(f, t, i) : f[t] = e[t]); return f; })(e, t); }
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
class MessageIO extends _events.EventEmitter {
// Node's `tls.TLSSocket#setMaxSendFragment` silently ignores values outside this range.
// (A static class property rather than a named export, as the `module.exports`
// assignment at the bottom of this file would clobber named exports for CJS consumers.)
static MAX_TLS_SEND_FRAGMENT_SIZE = 16384;
constructor(socket, packetSize, debug) {
super();
this.socket = socket;
this.debug = debug;
this.tlsNegotiationComplete = false;
this.incomingMessageStream = new _incomingMessageStream.default(this.debug);
this.incomingMessageIterator = this.incomingMessageStream[Symbol.asyncIterator]();
this.outgoingMessageStream = new _outgoingMessageStream.default(this.debug, {
packetSize: packetSize
});
this.socket.pipe(this.incomingMessageStream);
this.outgoingMessageStream.pipe(this.socket);
}
packetSize(...args) {
if (args.length > 0) {
const packetSize = args[0];
this.debug.log('Packet size changed from ' + this.outgoingMessageStream.packetSize + ' to ' + packetSize);
this.outgoingMessageStream.packetSize = packetSize;
}
const maxSendFragment = Math.min(this.outgoingMessageStream.packetSize, MessageIO.MAX_TLS_SEND_FRAGMENT_SIZE);
if (this.securePair) {
// Classic `encrypt: true` path: TLS is layered over a `DuplexPair`.
this.securePair.cleartext.setMaxSendFragment(maxSendFragment);
} else if (this.socket instanceof tls.TLSSocket) {
// `encrypt: "strict"` (TDS 8.0) path: the socket itself is the TLS socket. Without
// this, a server-initiated packet size change (ENVCHANGE) after login would leave
// the original cap in place, potentially allowing oversized TLS records again.
this.socket.setMaxSendFragment(maxSendFragment);
}
return this.outgoingMessageStream.packetSize;
}
// Negotiate TLS encryption.
startTls(credentialsDetails, hostname, trustServerCertificate) {
if (!credentialsDetails.maxVersion || !['TLSv1.2', 'TLSv1.1', 'TLSv1'].includes(credentialsDetails.maxVersion)) {
credentialsDetails.maxVersion = 'TLSv1.2';
}
const secureContext = tls.createSecureContext(credentialsDetails);
return new Promise((resolve, reject) => {
const duplexpair = new _nativeDuplexpair.default();
const securePair = this.securePair = {
cleartext: tls.connect({
socket: duplexpair.socket1,
// The `host` is used to verify the server's certificate identity.
// It is not used to establish a connection as a `socket` is
// specified.
host: hostname,
// RFC 6066 does not allow IP addresses to be used as the server
// name, so omit the SNI extension in that case.
servername: (0, _net.isIP)(hostname) ? '' : hostname,
secureContext: secureContext,
rejectUnauthorized: !trustServerCertificate
}),
encrypted: duplexpair.socket2
};
const onSecureConnect = () => {
securePair.encrypted.removeListener('readable', onReadable);
securePair.cleartext.removeListener('error', onError);
securePair.cleartext.removeListener('secureConnect', onSecureConnect);
// If we encounter any errors from this point on,
// we just forward them to the actual network socket.
securePair.cleartext.once('error', err => {
this.socket.destroy(err);
});
const cipher = securePair.cleartext.getCipher();
if (cipher) {
this.debug.log('TLS negotiated (' + cipher.name + ', ' + cipher.version + ')');
}
this.emit('secure', securePair.cleartext);
securePair.cleartext.setMaxSendFragment(Math.min(this.outgoingMessageStream.packetSize, MessageIO.MAX_TLS_SEND_FRAGMENT_SIZE));
this.outgoingMessageStream.unpipe(this.socket);
this.socket.unpipe(this.incomingMessageStream);
this.socket.pipe(securePair.encrypted);
securePair.encrypted.pipe(this.socket);
securePair.cleartext.pipe(this.incomingMessageStream);
this.outgoingMessageStream.pipe(securePair.cleartext);
this.tlsNegotiationComplete = true;
resolve();
};
const onError = err => {
securePair.encrypted.removeListener('readable', onReadable);
securePair.cleartext.removeListener('error', onError);
securePair.cleartext.removeListener('secureConnect', onSecureConnect);
securePair.cleartext.destroy();
securePair.encrypted.destroy();
reject(err);
};
const onReadable = () => {
// When there is handshake data on the encrypted stream of the secure pair,
// we wrap it into a `PRELOGIN` message and send it to the server.
//
// For each `PRELOGIN` message we sent we get back exactly one response message
// that contains the server's handshake response data.
const message = new _message.default({
type: _packet.TYPE.PRELOGIN,
resetConnection: false
});
let chunk;
while (chunk = securePair.encrypted.read()) {
message.write(chunk);
}
this.outgoingMessageStream.write(message);
message.end();
this.readMessage().then(async response => {
// Setup readable handler for the next round of handshaking.
// If we encounter a `secureConnect` on the cleartext side
// of the secure pair, the `readable` handler is cleared
// and no further handshake handling will happen.
securePair.encrypted.once('readable', onReadable);
for await (const data of response) {
// We feed the server's handshake response back into the
// encrypted end of the secure pair.
securePair.encrypted.write(data);
}
}).catch(onError);
};
securePair.cleartext.once('error', onError);
securePair.cleartext.once('secureConnect', onSecureConnect);
securePair.encrypted.once('readable', onReadable);
});
}
// TODO listen for 'drain' event when socket.write returns false.
// TODO implement incomplete request cancellation (2.2.1.6)
sendMessage(packetType, data, resetConnection) {
const message = new _message.default({
type: packetType,
resetConnection: resetConnection
});
message.end(data);
this.outgoingMessageStream.write(message);
return message;
}
/**
* Read the next incoming message from the socket.
*/
async readMessage() {
const result = await this.incomingMessageIterator.next();
if (result.done) {
throw new Error('unexpected end of message stream');
}
return result.value;
}
}
var _default = exports.default = MessageIO;
module.exports = MessageIO;
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["_nativeDuplexpair","_interopRequireDefault","require","tls","_interopRequireWildcard","_net","_events","_message","_packet","_incomingMessageStream","_outgoingMessageStream","e","t","WeakMap","r","n","__esModule","o","i","f","__proto__","default","has","get","set","hasOwnProperty","call","Object","defineProperty","getOwnPropertyDescriptor","MessageIO","EventEmitter","MAX_TLS_SEND_FRAGMENT_SIZE","constructor","socket","packetSize","debug","tlsNegotiationComplete","incomingMessageStream","IncomingMessageStream","incomingMessageIterator","Symbol","asyncIterator","outgoingMessageStream","OutgoingMessageStream","pipe","args","length","log","maxSendFragment","Math","min","securePair","cleartext","setMaxSendFragment","TLSSocket","startTls","credentialsDetails","hostname","trustServerCertificate","maxVersion","includes","secureContext","createSecureContext","Promise","resolve","reject","duplexpair","DuplexPair","connect","socket1","host","servername","isIP","rejectUnauthorized","encrypted","socket2","onSecureConnect","removeListener","onReadable","onError","once","err","destroy","cipher","getCipher","name","version","emit","unpipe","message","Message","type","TYPE","PRELOGIN","resetConnection","chunk","read","write","end","readMessage","then","response","data","catch","sendMessage","packetType","result","next","done","Error","value","_default","exports","module"],"sources":["../src/message-io.ts"],"sourcesContent":["import DuplexPair from 'native-duplexpair';\n\nimport { Duplex } from 'stream';\nimport * as tls from 'tls';\nimport { isIP, Socket } from 'net';\nimport { EventEmitter } from 'events';\n\nimport Debug from './debug';\n\nimport Message from './message';\nimport { TYPE } from './packet';\n\nimport IncomingMessageStream from './incoming-message-stream';\nimport OutgoingMessageStream from './outgoing-message-stream';\n\nclass MessageIO extends EventEmitter {\n  // Node's `tls.TLSSocket#setMaxSendFragment` silently ignores values outside this range.\n  // (A static class property rather than a named export, as the `module.exports`\n  // assignment at the bottom of this file would clobber named exports for CJS consumers.)\n  static readonly MAX_TLS_SEND_FRAGMENT_SIZE = 16384;\n\n  declare socket: Socket;\n  declare debug: Debug;\n\n  declare tlsNegotiationComplete: boolean;\n\n  declare private incomingMessageStream: IncomingMessageStream;\n  declare outgoingMessageStream: OutgoingMessageStream;\n\n  declare securePair?: {\n    cleartext: tls.TLSSocket;\n    encrypted: Duplex;\n  };\n\n  declare incomingMessageIterator: AsyncIterableIterator<Message>;\n\n  constructor(socket: Socket, packetSize: number, debug: Debug) {\n    super();\n\n    this.socket = socket;\n    this.debug = debug;\n\n    this.tlsNegotiationComplete = false;\n\n    this.incomingMessageStream = new IncomingMessageStream(this.debug);\n    this.incomingMessageIterator = this.incomingMessageStream[Symbol.asyncIterator]();\n\n    this.outgoingMessageStream = new OutgoingMessageStream(this.debug, { packetSize: packetSize });\n\n    this.socket.pipe(this.incomingMessageStream);\n    this.outgoingMessageStream.pipe(this.socket);\n  }\n\n  packetSize(...args: [number]) {\n    if (args.length > 0) {\n      const packetSize = args[0];\n      this.debug.log('Packet size changed from ' + this.outgoingMessageStream.packetSize + ' to ' + packetSize);\n      this.outgoingMessageStream.packetSize = packetSize;\n    }\n\n    const maxSendFragment = Math.min(this.outgoingMessageStream.packetSize, MessageIO.MAX_TLS_SEND_FRAGMENT_SIZE);\n\n    if (this.securePair) {\n      // Classic `encrypt: true` path: TLS is layered over a `DuplexPair`.\n      this.securePair.cleartext.setMaxSendFragment(maxSendFragment);\n    } else if (this.socket instanceof tls.TLSSocket) {\n      // `encrypt: \"strict\"` (TDS 8.0) path: the socket itself is the TLS socket. Without\n      // this, a server-initiated packet size change (ENVCHANGE) after login would leave\n      // the original cap in place, potentially allowing oversized TLS records again.\n      this.socket.setMaxSendFragment(maxSendFragment);\n    }\n\n    return this.outgoingMessageStream.packetSize;\n  }\n\n  // Negotiate TLS encryption.\n  startTls(credentialsDetails: tls.SecureContextOptions, hostname: string, trustServerCertificate: boolean) {\n    if (!credentialsDetails.maxVersion || !['TLSv1.2', 'TLSv1.1', 'TLSv1'].includes(credentialsDetails.maxVersion)) {\n      credentialsDetails.maxVersion = 'TLSv1.2';\n    }\n\n    const secureContext = tls.createSecureContext(credentialsDetails);\n\n    return new Promise<void>((resolve, reject) => {\n      const duplexpair = new DuplexPair();\n      const securePair = this.securePair = {\n        cleartext: tls.connect({\n          socket: duplexpair.socket1 as Socket,\n          // The `host` is used to verify the server's certificate identity.\n          // It is not used to establish a connection as a `socket` is\n          // specified.\n          host: hostname,\n          // RFC 6066 does not allow IP addresses to be used as the server\n          // name, so omit the SNI extension in that case.\n          servername: isIP(hostname) ? '' : hostname,\n          secureContext: secureContext,\n          rejectUnauthorized: !trustServerCertificate\n        }),\n        encrypted: duplexpair.socket2\n      };\n\n      const onSecureConnect = () => {\n        securePair.encrypted.removeListener('readable', onReadable);\n        securePair.cleartext.removeListener('error', onError);\n        securePair.cleartext.removeListener('secureConnect', onSecureConnect);\n\n        // If we encounter any errors from this point on,\n        // we just forward them to the actual network socket.\n        securePair.cleartext.once('error', (err) => {\n          this.socket.destroy(err);\n        });\n\n        const cipher = securePair.cleartext.getCipher();\n        if (cipher) {\n          this.debug.log('TLS negotiated (' + cipher.name + ', ' + cipher.version + ')');\n        }\n\n        this.emit('secure', securePair.cleartext);\n\n        securePair.cleartext.setMaxSendFragment(Math.min(this.outgoingMessageStream.packetSize, MessageIO.MAX_TLS_SEND_FRAGMENT_SIZE));\n\n        this.outgoingMessageStream.unpipe(this.socket);\n        this.socket.unpipe(this.incomingMessageStream);\n\n        this.socket.pipe(securePair.encrypted);\n        securePair.encrypted.pipe(this.socket);\n\n        securePair.cleartext.pipe(this.incomingMessageStream);\n        this.outgoingMessageStream.pipe(securePair.cleartext);\n\n        this.tlsNegotiationComplete = true;\n\n        resolve();\n      };\n\n      const onError = (err?: Error) => {\n        securePair.encrypted.removeListener('readable', onReadable);\n        securePair.cleartext.removeListener('error', onError);\n        securePair.cleartext.removeListener('secureConnect', onSecureConnect);\n\n        securePair.cleartext.destroy();\n        securePair.encrypted.destroy();\n\n        reject(err);\n      };\n\n      const onReadable = () => {\n        // When there is handshake data on the encrypted stream of the secure pair,\n        // we wrap it into a `PRELOGIN` message and send it to the server.\n        //\n        // For each `PRELOGIN` message we sent we get back exactly one response message\n        // that contains the server's handshake response data.\n        const message = new Message({ type: TYPE.PRELOGIN, resetConnection: false });\n\n        let chunk;\n        while (chunk = securePair.encrypted.read()) {\n          message.write(chunk);\n        }\n        this.outgoingMessageStream.write(message);\n        message.end();\n\n        this.readMessage().then(async (response) => {\n          // Setup readable handler for the next round of handshaking.\n          // If we encounter a `secureConnect` on the cleartext side\n          // of the secure pair, the `readable` handler is cleared\n          // and no further handshake handling will happen.\n          securePair.encrypted.once('readable', onReadable);\n\n          for await (const data of response) {\n            // We feed the server's handshake response back into the\n            // encrypted end of the secure pair.\n            securePair.encrypted.write(data);\n          }\n        }).catch(onError);\n      };\n\n      securePair.cleartext.once('error', onError);\n      securePair.cleartext.once('secureConnect', onSecureConnect);\n      securePair.encrypted.once('readable', onReadable);\n    });\n  }\n\n  // TODO listen for 'drain' event when socket.write returns false.\n  // TODO implement incomplete request cancellation (2.2.1.6)\n  sendMessage(packetType: number, data?: Buffer, resetConnection?: boolean) {\n    const message = new Message({ type: packetType, resetConnection: resetConnection });\n    message.end(data);\n    this.outgoingMessageStream.write(message);\n    return message;\n  }\n\n  /**\n   * Read the next incoming message from the socket.\n   */\n  async readMessage(): Promise<Message> {\n    const result = await this.incomingMessageIterator.next();\n\n    if (result.done) {\n      throw new Error('unexpected end of message stream');\n    }\n\n    return result.value;\n  }\n}\n\nexport default MessageIO;\nmodule.exports = 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