tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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test_fingerprints.html (3148B)

      1 <html>
      2 <head>
      3 <meta charset="utf-8" />
      4 <script type="application/javascript">var scriptRelativePath = "../";</script>
      5 <script type="application/javascript" src="../pc.js"></script>
      6 </head>
      7 <body>
      8 <script class="testbody" type="application/javascript">
      9 createHTML({ title: "Test multiple identity fingerprints",  bug: "1005152" });
     10 
     11 // here we call the identity provider directly
     12 async function getIdentityAssertion(fingerprint) {
     13  const { IdpSandbox } = SpecialPowers.ChromeUtils.importESModule(
     14    'resource://gre/modules/media/IdpSandbox.sys.mjs'
     15  );
     16  const sandbox = new IdpSandbox('example.com', 'idp.js', window);
     17  const idp = SpecialPowers.wrap(await sandbox.start());
     18  const assertion = SpecialPowers.wrap(await
     19      idp.generateAssertion(JSON.stringify({ fingerprint }),
     20                            'https://example.com',
     21                            {}));
     22  const assertionString = btoa(JSON.stringify(assertion));
     23  sandbox.stop();
     24  return assertionString;
     25 }
     26 
     27 // This takes a real fingerprint and makes some extra bad ones.
     28 function makeFingerprints(algorithm, digest) {
     29  const fingerprints = [];
     30  fingerprints.push({ algorithm, digest });
     31  for (var i = 0; i < 3; ++i) {
     32    fingerprints.push({
     33      algorithm,
     34      digest: digest.replace(/:./g, ':' + i.toString(16))
     35    });
     36  }
     37  return fingerprints;
     38 }
     39 
     40 const fingerprintRegex = /^a=fingerprint:(\S+) (\S+)/m;
     41 const identityRegex = /^a=identity:(\S+)/m;
     42 
     43 function fingerprintSdp(fingerprints) {
     44  return fingerprints.map(fp => 'a=fInGeRpRiNt:' + fp.algorithm +
     45                                ' ' + fp.digest + '\n').join('');
     46 }
     47 
     48 // Firefox only uses a single fingerprint.
     49 // That doesn't mean we have it create SDP that describes two.
     50 // This function synthesizes that SDP and tries to set it.
     51 
     52 runNetworkTest(async () => {
     53  // this one fails setRemoteDescription if the identity is not good
     54  const pcStrict = new RTCPeerConnection({ peerIdentity: 'someone@example.com'});
     55  // this one will be manually tweaked to have two fingerprints
     56  const pcDouble = new RTCPeerConnection({});
     57 
     58  const stream = await getUserMedia({ video: true });
     59  ok(stream, 'Got test stream');
     60  const [track] = stream.getTracks();
     61  pcDouble.addTrack(track, stream);
     62  try {
     63    const offer = await pcDouble.createOffer();
     64    ok(offer, 'Got offer');
     65    const match = offer.sdp.match(fingerprintRegex);
     66    if (!match) {
     67      throw new Error('No fingerprint in offer SDP');
     68    }
     69    const fingerprints = makeFingerprints(match[1], match[2]);
     70    const assertion = await getIdentityAssertion(fingerprints);
     71    ok(assertion, 'Should have assertion');
     72 
     73    const sdp = offer.sdp.slice(0, match.index) +
     74        'a=identity:' + assertion + '\n' +
     75        fingerprintSdp(fingerprints.slice(1)) +
     76        offer.sdp.slice(match.index);
     77 
     78    await pcStrict.setRemoteDescription({ type: 'offer', sdp });
     79    ok(true, 'Modified fingerprints were accepted');
     80  } catch (error) {
     81    const e = SpecialPowers.wrap(error);
     82    ok(false, 'error in test: ' +
     83       (e.message ? (e.message + '\n' + e.stack) : e));
     84  }
     85  pcStrict.close();
     86  pcDouble.close();
     87  track.stop();
     88 });
     89 </script>
     90 </body>
     91 </html>