No privilege, no risk - Devoxx 2013

Transcript

1. @mikewest #DV13-security No privilege, no risk A client-side security cornucopia

   Mike West https://mikewest.org G+: mkw.st/+ Twitter: @mikewest Slides: https://mkw.st/r/devoxx13

2. http://traumwerk.stanford.edu/philolog/2009/10/homers_odyssey_in_art_sirens_f.html

3. http://traumwerk.stanford.edu/philolog/2009/10/homers_odyssey_in_art_sirens_f.html

4. "Enigma" - skittledog, http://flic.kr/p/9VjJz5 Step 0: Encrypt all traffic.

5. None
6. None
7. None

8. Set-Cookie: ...; secure; HttpOnly

9. Strict-Transport-Security: max-age=2592000; includeSubDomains

10. None

11. Public-Key-Pins: max-age=2592000; pin-sha256="4n972H…yw4uqe/baXc="

12. "Framed in the Valley" - cobalt123, http://www.flickr.com/photos/cobalt/5354090310/ Limit Unanticipated Framing.

13. Click me! I am happy!

14. X-Frame-Options: DENY or X-Frame-Options: SAMEORIGIN

15. "X-Frame-Options: All about Clickjacking?" https://cure53.de/xfo-clickjacking.pdf

16. "Sniff" - tiny banquet committee, http://www.flickr.com/photos/tinybanquet/880076486 Prevent MIME-Type Sniffing.

17. X-Content-Type-Options: nosniff

18. None

19. "Finance - Financial Injection - Finance" - doug8888, http://www.flickr.com/photos/doug88888/4561376850/ Mitigate

    content injection.

20. scheme://host:port

21. <script> beAwesome(); </script> <script> beEvil(); </script>

22. <script> beAwesome(); </script> <!-- <p>Hello, {$name}!</p> --> <p>Hello, <script> beEvil();

    </script></p>

23. <style> p { color: {{USER_COLOR}}; } </style> <p> Hello {{USER_NAME}},

    view your <a href="{{USER_URL}}">Account</a>. </p> <script> var id = {{USER_ID}}; </script> <!-- DEBUG: {{INFO}} -->

24. "I discount the probability of perfection." -Alex Russell

25. "We are all idiots with deadlines." -Mike West

26. X-XSS-Protection: 1; mode=block or X-XSS-Protection: 0 but not X-XSS-Protection: 1

27. X-XSS-Protection: 1; mode=block; report=https://example.com/url

28. http://www.html5rocks.com/en/tutorials/security/content-security-policy/ https://mkw.st/r/csp

29. Content-Security-Policy: default-src 'none'; style-src https://mikewestdotorg.hasacdn.net; frame-src https://www.youtube.com https://www.speakerdeck.com; script-src https://mikewestdotorg.hasacdn.net

    https://ssl.google-analytics.com; img-src 'self' https://mikewestdotorg.hasacdn.net https://ssl.google-analytics.com; font-src https://mikewestdotorg.hasacdn.net

30. Content-Security-Policy: default-src ...; script-src ...; object-src ...; style-src ...; img-src

    ...; media-src ...; frame-src ...; font-src ...; connect-src ...; sandbox ...; report-uri https://example.com/reporter.cgi

31. Content-Security-Policy-Report-Only: default-src https:; report-uri https://example.com/csp-violations { "csp-report": { "document-uri": "http://example.org/page.html",

    "referrer": "http://evil.example.com/haxor.html", "blocked-uri": "http://evil.example.com/img.png", "violated-directive": "default-src 'self'", "original-policy": "...", "source-file": "http://example.com/script.js", "line-number": 10, "column-number": 11, } }

32. <script> function handleClick() { ... } </script> <button onclick="handleClick()">Click me!</button>

    <a href="javascript:handleClick()">Click me!</a>

33. <!-- index.html --> <script src="clickHandler.js"></script> <button class="clckr">Click me!</button> <a href="#"

    class="clckr">Click me!</a> <!-- clickHandler.js --> function handleClick() { ... } function init() { for (var e in document.querySelectorAll('.clckr')) e.addEventListener('click', handleClick); }

34. Content-Security-Policy: script-src 'nonce-afbvjn+afpo-j1qer'; <button class="clckr">Click me!</button> <a href="#" class="clckr">Click me!</a>

    <script nonce="afbvjn+afpo-j1qer"> function handleClick() { ... } function init() { var e; for (e in document.querySelectorAll('.clckr')) e.addEventListener('click', handleClick); } </script>

35. Content-Security-Policy: script-src 'sha256-afbvjn+...afpo-j1qer'; <button class="clckr">Click me!</button> <a href="#" class="clckr">Click me!</a>

    <script> function handleClick() { ... } function init() { var e; for (e in document.querySelectorAll('.clckr')) e.addEventListener('click', handleClick); } </script>

36. "Sandbox Shadow" - Scott Robinson, http://www.flickr.com/photos/clearlyambiguous/27454797 Limit IFrame Capabilities

37. <iframe src="page.html" sandbox></iframe> <!-- * Unique origin * No plugins.

    * No script. * No form submissions. * No top-level navigation. * No popups. * No autoplay. * No pointer lock. * No seamless iframes. -->

38. <iframe src="page.html" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-top-navigation"> </iframe> <!--

    * No plugins. * No seamless iframes. -->

39. http://www.html5rocks.com/en/tutorials/security/sandboxed-iframes/ goo.gl/WJjv10

40. "Vandalised Red Telephone Box" - Jon Pinder, http://www.flickr.com/photos/rofanator/5364666818 Secure Cross-Origin

    Communication

41. <script> var frame = document.querySelector('iframe'); frame.contentWindow.postMessage(message, 'example.com'); window.addEventListener('message', function (e)

    { if (e.origin === 'example.com') // Do something amazing in response! }); </script>

42. <script> var frame = document.querySelector('iframe'); frame.contentWindow.postMessage(message, '*'); window.addEventListener('message', function (e)

    { if (e.origin === "null" && e.source === frame.contentWindow) // Do something amazing in response! }); </script>

43. <script> window.addEventListener('message', function (e) { if (e.origin !== window.location.origin) return;

    // Do something amazing in response! e.source.postMessage(result, e.origin); }); </script>

44. <script> var channel = new MessageChannel(); // channel.port1 <-> channel.port2

    frame.contentWindow.postMessage( 'init', '*', [ channel.port2 ]); channel.port1.postMessage(message); channel.port1.addEventListener('message', ...); </script>

45. "Enigma" - skittledog, http://flic.kr/p/9VjJz5 Moar Encryption

46. http://nick.bleeken.eu/presentations/devoxx-2013/

47. https://mkw.st/r/devoxx13 Thanks! Mike West https://mikewest.org G+: mkw.st/+ Twitter: @mikewest Slides:

    https://mkw.st/r/devoxx13