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TooTallNate / starttls.js
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Upgrade a regular `net.Stream` connection to a secure `tls` connection.

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starttls.js
JavaScript
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// Target API:
//
//  var s = require('net').createStream(25, 'smtp.example.com');
//  s.on('connect', function() {
//   require('starttls')(s, options, function() {
//      if (!s.authorized) {
//        s.destroy();
//        return;
//      }
//
//      s.end("hello world\n");
//    });
//  });
//
//
module.exports = function starttls(socket, options, cb) {
 
  var sslcontext = require('crypto').createCredentials(options);
 
  var pair = require('tls').createSecurePair(sslcontext, false);
 
  var cleartext = pipe(pair, socket);
 
  pair.on('secure', function() {
    var verifyError = pair._ssl.verifyError();
 
    if (verifyError) {
      cleartext.authorized = false;
      cleartext.authorizationError = verifyError;
    } else {
      cleartext.authorized = true;
    }
 
    if (cb) cb();
  });
 
  cleartext._controlReleased = true;
  return cleartext;
};
 
 
function pipe(pair, socket) {
  pair.encrypted.pipe(socket);
  socket.pipe(pair.encrypted);
 
  pair.fd = socket.fd;
  var cleartext = pair.cleartext;
  cleartext.socket = socket;
  cleartext.encrypted = pair.encrypted;
  cleartext.authorized = false;
 
  function onerror(e) {
    if (cleartext._controlReleased) {
      cleartext.emit('error', e);
    }
  }
 
  function onclose() {
    socket.removeListener('error', onerror);
    socket.removeListener('close', onclose);
  }
 
  socket.on('error', onerror);
  socket.on('close', onclose);
 
  return cleartext;
}
astro commented

tls.js, where this code originates from, underwent some changes after this was posted. pair._ssl is now pair.ssl.

Unfortunately, tls.js is not documented.

dhruvbird commented

@astro Thanks for the update :-)

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