tor-browser

test_be_conservative_error_handling.js (6171B)

---

// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/publicdomain/zero/1.0/

"use strict";

// Tests that nsIHttpChannelInternal.beConservative correctly limits the use of
// advanced TLS features that may cause compatibility issues. Does so by
// starting a TLS server that requires the advanced features and then ensuring
// that a client that is set to be conservative will fail when connecting.

// Get a profile directory and ensure PSM initializes NSS.
do_get_profile();
Cc["@mozilla.org/psm;1"].getService(Ci.nsISupports);

class InputStreamCallback {
 constructor(output) {
   this.output = output;
   this.stopped = false;
 }

 onInputStreamReady(stream) {
   info("input stream ready");
   if (this.stopped) {
     info("input stream callback stopped - bailing");
     return;
   }
   let available = 0;
   try {
     available = stream.available();
   } catch (e) {
     // onInputStreamReady may fire when the stream has been closed.
     equal(
       e.result,
       Cr.NS_BASE_STREAM_CLOSED,
       "error should be NS_BASE_STREAM_CLOSED"
     );
   }
   if (available > 0) {
     let request = NetUtil.readInputStreamToString(stream, available, {
       charset: "utf8",
     });
     ok(
       request.startsWith("GET / HTTP/1.1\r\n"),
       "Should get a simple GET / HTTP/1.1 request"
     );
     let response =
       "HTTP/1.1 200 OK\r\n" +
       "Content-Length: 2\r\n" +
       "Content-Type: text/plain\r\n" +
       "\r\nOK";
     let written = this.output.write(response, response.length);
     equal(
       written,
       response.length,
       "should have been able to write entire response"
     );
   }
   this.output.close();
   info("done with input stream ready");
 }

 stop() {
   this.stopped = true;
   this.output.close();
 }
}

class TLSServerSecurityObserver {
 constructor(input, output) {
   this.input = input;
   this.output = output;
   this.callbacks = [];
   this.stopped = false;
 }

 onHandshakeDone(socket, status) {
   info("TLS handshake done");
   info(`TLS version used: ${status.tlsVersionUsed}`);

   if (this.stopped) {
     info("handshake done callback stopped - bailing");
     return;
   }

   let callback = new InputStreamCallback(this.output);
   this.callbacks.push(callback);
   this.input.asyncWait(callback, 0, 0, Services.tm.currentThread);
 }

 stop() {
   this.stopped = true;
   this.input.close();
   this.output.close();
   this.callbacks.forEach(callback => {
     callback.stop();
   });
 }
}

class ServerSocketListener {
 constructor() {
   this.securityObservers = [];
 }

 onSocketAccepted(socket, transport) {
   info("accepted TLS client connection");
   let connectionInfo = transport.securityCallbacks.getInterface(
     Ci.nsITLSServerConnectionInfo
   );
   let input = transport.openInputStream(0, 0, 0);
   let output = transport.openOutputStream(0, 0, 0);
   let securityObserver = new TLSServerSecurityObserver(input, output);
   this.securityObservers.push(securityObserver);
   connectionInfo.setSecurityObserver(securityObserver);
 }

 // For some reason we get input stream callback events after we've stopped
 // listening, so this ensures we just drop those events.
 onStopListening() {
   info("onStopListening");
   this.securityObservers.forEach(observer => {
     observer.stop();
   });
 }
}

function startServer(cert, minServerVersion, maxServerVersion) {
 let tlsServer = Cc["@mozilla.org/network/tls-server-socket;1"].createInstance(
   Ci.nsITLSServerSocket
 );
 tlsServer.init(-1, true, -1);
 tlsServer.serverCert = cert;
 tlsServer.setVersionRange(minServerVersion, maxServerVersion);
 tlsServer.setSessionTickets(false);
 tlsServer.asyncListen(new ServerSocketListener());
 return tlsServer;
}

const hostname = "example.com";

function storeCertOverride(port, cert) {
 let certOverrideService = Cc[
   "@mozilla.org/security/certoverride;1"
 ].getService(Ci.nsICertOverrideService);
 certOverrideService.rememberValidityOverride(hostname, port, {}, cert, true);
}

function startClient(port, beConservative, expectSuccess) {
 let req = new XMLHttpRequest();
 req.open("GET", `https://${hostname}:${port}`);
 let internalChannel = req.channel.QueryInterface(Ci.nsIHttpChannelInternal);
 internalChannel.beConservative = beConservative;
 return new Promise(resolve => {
   req.onload = () => {
     ok(
       expectSuccess,
       `should ${expectSuccess ? "" : "not "}have gotten load event`
     );
     equal(req.responseText, "OK", "response text should be 'OK'");
     resolve();
   };
   req.onerror = () => {
     ok(
       !expectSuccess,
       `should ${!expectSuccess ? "" : "not "}have gotten an error`
     );
     resolve();
   };

   req.send();
 });
}

add_task(async function () {
 // Restrict to only TLS 1.3.
 Services.prefs.setIntPref("security.tls.version.min", 4);
 Services.prefs.setIntPref("security.tls.version.max", 4);
 Services.prefs.setCharPref("network.dns.localDomains", hostname);
 let cert = getTestServerCertificate();

 // Run a server that accepts TLS 1.2 and 1.3. The connection should succeed.
 let server = startServer(
   cert,
   Ci.nsITLSClientStatus.TLS_VERSION_1_2,
   Ci.nsITLSClientStatus.TLS_VERSION_1_3
 );
 storeCertOverride(server.port, cert);
 await startClient(
   server.port,
   true /*be conservative*/,
   true /*should succeed*/
 );
 server.close();

 // Now run a server that only accepts TLS 1.3. A conservative client will not
 // succeed in this case.
 server = startServer(
   cert,
   Ci.nsITLSClientStatus.TLS_VERSION_1_3,
   Ci.nsITLSClientStatus.TLS_VERSION_1_3
 );
 storeCertOverride(server.port, cert);
 await startClient(
   server.port,
   true /*be conservative*/,
   false /*should fail*/
 );
 server.close();
});

registerCleanupFunction(function () {
 Services.prefs.clearUserPref("security.tls.version.min");
 Services.prefs.clearUserPref("security.tls.version.max");
 Services.prefs.clearUserPref("network.dns.localDomains");
});