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Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
Kiwipycon command line
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Kiwipycon command line

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My talk at KiwiPyCon 2011 about securely giving your website a command line API

My talk at KiwiPyCon 2011 about securely giving your website a command line API

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  • 1. Giving your website a command line interface<br />Michael Hudson-Doyle<br />michael.hudson@linaro.org<br />
  • 2. Linaro and its mission<br />Linaro aims to make Linux work better on ARM processors<br />
  • 3. The Problem<br />The ARM ecosystem is very fragmented, and the kernel has a lot of copy and paste code<br />"Gaah. Guys, this whole ARM thing is a f*cking pain in the ass."<br />— Linus Torvalds, 17 Mar 2011<br />https://lwn.net/Articles/437170/<br />
  • 4. Enter Linaro!<br />"Linaro is a not-for-profit software engineering company investing in core Linux software and tools for ARM SoCs."<br />Also about educating the members in how to do open source development...<br />
  • 5. LAVA - Linaro Automated Validation<br />A bit part of Linaro is about automated validation:<br /><ul><li>Find regressions earlier
  • 6. Also benchmark toolchain improvements
  • 7. Maybe even power management changes too...</li></li></ul><li>LAVA<br />We have a bunch of hardware<br />
  • 8. LAVA<br />Some scripts and tricks that can boot a board with a new kernel and run some tests.<br />Quick Demo<br />(ever the optimist)<br />
  • 9. LAVA<br />And a website that lets you see whats going on<br />
  • 10. The Problem (finally!)<br />We want to do things like trigger test runs when a kernel build finishes.<br />This basically means some kind of Remote Procedure Call (RPC).<br />
  • 11. Paranoia<br />For a bunch of reasons, we need some kind of security in our system:<br /><ul><li>The boards in our lab are a limited resource
  • 12. Some risk of mischief
  • 13. Eventually may have test results from unreleased hardware or benchmarks with licenses that forbid publication of results</li></li></ul><li>Protocol Choices<br /><ul><li>We use XML-RPC
  • 14. We didn't think about this very hard but it is well supported in most languages
  • 15. Will probably add JSON-RPC support at some point for easier browser access</li></li></ul><li>First idea: OAuth<br />An open protocol to allow secure API authorization in a simple and standard method from desktop and web applications.<br />– http://oauth.net/<br />
  • 16. The great thing about standards...<br /><bob2> kennethreitz: oauth <br /> is a font of villany <br /> and dispair<br /> -- #python, Jun 09 11:55:08<br />
  • 17. Also doesn't solve our problem<br />OAuth specifies that various aspects of the request are signed, but not, crucially for us, the body of the request – an important detail, because in XML-RPC the body of the request is where all the important stuff is.<br />
  • 18. Transport Layer Security, here we come<br />If you're going as far as to cryptographically sign something, it's not much further to go to actually just encrypt it!<br />
  • 19. And what does everyone know about encryption?<br />Don't implement it yourself<br />(i.e. use HTTPS)<br />
  • 20. Back to Basic<br />And if you're operating over HTTPS, you might as well just just good old RFC 2617 Basic Authentication...<br />... but with tokens rather than passwords<br />
  • 21. Tokens > Passwords<br />Because we expect the RPC to be invoked from build systems and so on, there is a moderate chance of the token being leaked – so it should not let you take over the owning user's account.<br />In the future, a token might only let you access some APIs.<br />
  • 22. Also, we use SSO...<br />In addition we use Launchpad's SSO service for authentication, so most users don't have a LAVA password!<br />
  • 23. Show me the code!<br />On the server side, we've built a library that lets you add a authenticating XML-RPC to a Django project:<br />https://launchpad.net/linaro-django-xmlrpc<br />It includes views and models (and very very simple templates) for creating and managing tokens.<br />
  • 24. Server side code<br />example/api.py:<br />from linaro_django_xmlrpc.models import ExposedAPI<br />from linaro_django_xmlrpc.globals import mapper<br />class ExampleAPI(ExposedAPI):<br /> def whoami(self):<br /> if self.user:<br /> return self.user.username<br /> else:<br /> return None<br />mapper.register(ExampleAPI)<br />in your urlconf:<br /> url(r'', include('linaro_django_xmlrpc.urls')),<br />
  • 25. Client side library<br />This isn't properly factored yet really (it's it all mashed up with our toolkit for doing command line tools), but the code is in "lava-tool":<br />https://launchpad.net/lava-tool<br />It uses python-keyring for token management.<br />
  • 26. Client-side code<br />from lava_tool.authtoken import <br /> AuthenticatingServerProxy, KeyringAuthBackend<br />auth_backend = KeyringAuthBackend()<br />auth_backend.add_token(<br /> "user", "http://server/RPC2/", token)<br />sp = AuthenticatingServerProxy(<br /> "http://user@server/RPC2/",<br /> auth_backend=auth_backend)<br />print server.whoami()<br />
  • 27. Demo<br />(assuming the first one wasn't a disaster)<br />
  • 28. Conclusion<br />The lesson:<br />Don't try to be clever – just use HTTPS and Basic auth.<br />The code:<br />lp:linaro-django-xmlrpc<br />lp:lava-tool<br />
  • 29. Thanks for listening!<br />Any Questions?<br />

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