'use strict'; var common = require('../common'); var assert = require('assert'); if (!common.hasCrypto) { common.skip('missing crypto'); return; } var tls = require('tls'); var fs = require('fs'); var nconns = 0; // We explicitly set TLS version to 1.2 so as to be safe when the // default method is updated in the future var SSL_Method = 'TLSv1_2_method'; var localhost = '127.0.0.1'; process.on('exit', function() { assert.equal(nconns, 6); }); function test(honorCipherOrder, clientCipher, expectedCipher, cb) { var soptions = { secureProtocol: SSL_Method, key: fs.readFileSync(common.fixturesDir + '/keys/agent2-key.pem'), cert: fs.readFileSync(common.fixturesDir + '/keys/agent2-cert.pem'), ciphers: 'AES256-SHA256:AES128-GCM-SHA256:AES128-SHA256:' + 'ECDHE-RSA-AES128-GCM-SHA256', honorCipherOrder: !!honorCipherOrder }; var server = tls.createServer(soptions, function(cleartextStream) { nconns++; // End socket to send CLOSE_NOTIFY and TCP FIN packet, otherwise // it may hang for ~30 seconds in FIN_WAIT_1 state (at least on OSX). cleartextStream.end(); }); server.listen(0, localhost, function() { var coptions = { rejectUnauthorized: false, secureProtocol: SSL_Method }; if (clientCipher) { coptions.ciphers = clientCipher; } const port = this.address().port; var client = tls.connect(port, localhost, coptions, function() { var cipher = client.getCipher(); client.end(); server.close(); assert.equal(cipher.name, expectedCipher); if (cb) cb(); }); }); } test1(); function test1() { // Client has the preference of cipher suites by default test(false, 'AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256', 'AES128-GCM-SHA256', test2); } function test2() { // Server has the preference of cipher suites, and AES256-SHA256 is // the server's top choice. test(true, 'AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256', 'AES256-SHA256', test3); } function test3() { // Server has the preference of cipher suites. AES128-GCM-SHA256 is given // higher priority over AES128-SHA256 among client cipher suites. test(true, 'AES128-SHA256:AES128-GCM-SHA256', 'AES128-GCM-SHA256', test4); } function test4() { // As client has only one cipher, server has no choice, irrespective // of honorCipherOrder. test(true, 'AES128-SHA256', 'AES128-SHA256', test5); } function test5() { // Client did not explicitly set ciphers and client offers // tls.DEFAULT_CIPHERS. All ciphers of the server are included in the // default list so the negotiated cipher is selected according to the // server's top preference of AES256-SHA256. test(true, null, 'AES256-SHA256', test6); } function test6() { // Ensure that `tls.DEFAULT_CIPHERS` is used tls.DEFAULT_CIPHERS = 'ECDHE-RSA-AES128-GCM-SHA256'; test(true, null, 'ECDHE-RSA-AES128-GCM-SHA256'); }