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The TLS protocol allows (and sometimes requires) clients to renegotiate the session. However, renegotiation requires a disproportional amount of server-side resources, particularly CPU time, which makes it a potential vector for denial-of-service attacks. To mitigate this issue, we keep track of and limit the number of renegotiation requests over time, emitting an error if the threshold is exceeded.
101 lines
3.2 KiB
JavaScript
101 lines
3.2 KiB
JavaScript
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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var common = require('../common');
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var assert = require('assert');
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var spawn = require('child_process').spawn;
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var tls = require('tls');
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var fs = require('fs');
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// renegotiation limits to test
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var LIMITS = [0, 1, 2, 3, 5, 10, 16];
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if (process.platform === 'win32') {
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console.log("Skipping test, you probably don't have openssl installed.");
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process.exit();
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}
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(function() {
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var n = 0;
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function next() {
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if (n >= LIMITS.length) return;
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tls.CLIENT_RENEG_LIMIT = LIMITS[n++];
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test(next);
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}
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next();
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})();
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function test(next) {
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var options = {
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cert: fs.readFileSync(common.fixturesDir + '/test_cert.pem'),
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key: fs.readFileSync(common.fixturesDir + '/test_key.pem')
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};
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var server = tls.createServer(options, function(conn) {
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conn.on('error', function(err) {
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console.error('Caught exception: ' + err);
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assert(/TLS session renegotiation attack/.test(err));
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conn.destroy();
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});
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conn.pipe(conn);
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});
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server.listen(common.PORT, function() {
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var args = ('s_client -connect 127.0.0.1:' + common.PORT).split(' ');
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var child = spawn('openssl', args);
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child.stdout.pipe(process.stdout);
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child.stderr.pipe(process.stderr);
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// count handshakes, start the attack after the initial handshake is done
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var handshakes = 0;
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child.stderr.on('data', function(data) {
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handshakes += (('' + data).match(/verify return:1/g) || []).length;
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if (handshakes === 2) spam();
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});
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child.on('exit', function() {
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// with a renegotiation limit <= 1, we always see 4 handshake markers:
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// two for the initial handshake and another two for the attempted
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// renegotiation
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assert.equal(handshakes, 2 * Math.max(2, tls.CLIENT_RENEG_LIMIT));
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server.close();
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process.nextTick(next);
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});
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var closed = false;
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child.stdin.on('error', function(err) {
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assert.equal(err.code, 'EPIPE');
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closed = true;
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});
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child.stdin.on('close', function() {
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closed = true;
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});
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// simulate renegotiation attack
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function spam() {
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if (closed) return;
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child.stdin.write("R\n");
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setTimeout(spam, 250);
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}
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});
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}
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