test: add regression test for nghttp2 CVE-2018-1000168

PR-URL: nodejs-private/node-private#117
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>

test/common/http2.js

@@ -127,8 +127,18 @@ class PingFrame extends Frame {
   }
 }
 
+class AltSvcFrame extends Frame {
+  constructor(size) {
+    const buffers = [Buffer.alloc(size)];
+    super(size, 10, 0, 0);
+    buffers.unshift(this[kFrameData]);
+    this[kFrameData] = Buffer.concat(buffers);
+  }
+}
+
 module.exports = {
   Frame,
+  AltSvcFrame,
   DataFrame,
   HeadersFrame,
   SettingsFrame,

test/parallel/test-http2-malformed-altsvc.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const common = require('../common');
+
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const http2 = require('http2');
+const net = require('net');
+const h2test = require('../common/http2');
+
+const server = http2.createServer();
+server.on('stream', common.mustNotCall());
+
+const settings = new h2test.SettingsFrame();
+const settingsAck = new h2test.SettingsFrame(true);
+const altsvc = new h2test.AltSvcFrame((1 << 14) + 1);
+
+server.listen(0, () => {
+  const client = net.connect(server.address().port, () => {
+    client.write(h2test.kClientMagic, () => {
+      client.write(settings.data, () => {
+        client.write(settingsAck.data);
+        // Prior to nghttp2 1.31.1, sending this malformed altsvc frame
+        // would cause a segfault. This test is successful if a segfault
+        // does not occur.
+        client.write(altsvc.data, common.mustCall(() => {
+          client.destroy();
+        }));
+      });
+    });
+  });
+
+  // An error may or may not be emitted on the client side, we don't care
+  // either way if it is, but we don't want to die if it is.
+  client.on('error', () => {});
+  client.on('close', common.mustCall(() => server.close()));
+  client.resume();
+});