CODEWITHSUNDEEP
node.jstls1.2
Brad Parks
Brad Parks

Reputation: 71961

Node - logging versions of TLS for outbound connections?

I'd like to log which versions of TLS my Node app is using, if possible without changing any code.

I've tried both NODE_DEBUG=tls,http, and DEBUG=* which of course added lots of info to the logs, but nothing about the TLS versions in use.

Is this possible ?

Upvotes: 4

Views: 1039

Answers (1)

Terry Lennox
Terry Lennox

Reputation: 30675

I'm not sure about not changing code, but you can log like this: 

const tls = require('tls');

const url = 'someurl';
console.log('Connecting..');

const socket = tls.connect(443, url, () => {
  console.log('Tls.connect', socket.authorized ? 'authorized' : 'unauthorized');  
  console.log('Cipher: ' + JSON.stringify(socket.getCipher()));
  console.log('Protocol: ' + JSON.stringify(socket.getProtocol()));
});

This will give an output like this:

Listening...
Connecting..
Tls.connect authorized
Cipher: {"name":"ECDHE-RSA-AES128-GCM-SHA256","version":"TLSv1/SSLv3"}
Protocol: "TLSv1.2"

Upvotes: 1

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