Integrating services with OAuth


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Integrating services with OAuth

  1. Integrating services with Luca Mearelli Web2Expo - Berlin 2008
  2. Web 2.0 means sharing data, through API
  3. Users want to access their data using many services
  4. Developers want to satisfy their users (and make it easy for them)
  5. Service providers need to keep their users data secure
  6. welcome the password antipattern
  7. Image from
  8. Passwords are precious
  9. Stop asking them Stop the antipattern
  10. How to delegate access?
  11. Your valet key for the web
  12. a play in 3 acts (to exchange authorization)
  13. Actors on the scene User Consumer Service Provider
  14. Prologue Where the Consumer presents himself to the Service Provider
  15. Consumer (to Service Provider): here i am, this is what i do
  16. consumer service provider Consumer key Consumer secret
  17. First act Where the Consumer obtains an unauthorized Request Token
  18. Consumer (to Service Provider): give me a request token
  19. consumer service provider oauth_consumer_key oauth_signature_method oauth_signature oauth_timestamp oauth_nonce oauth_version (optional) [additional parameters]
  20. Service Provider (to consumer): here is the request token (you can use it only once!)
  21. service provider consumer oauth_token (request token) oauth_token_secret [additional parameters]
  22. Second act Where the User authorizes the Request Token
  23. Consumer (to the User): Please go to the Service Provider and authorize this request
  24. consumer user service provider oauth_token (request token) oauth_callback [additional parameters]
  25. Service Provider (to the User): Do you authorize consumer to access your data?
  26. User (to the Service Provider): YES! (or maybe NO :-) )
  27. Service Provider (to the User): You can go back to the consumer
  28. service providerservice provider user user consumer oauth_token (request token)
  29. Third act Where the Consumer exchanges the Request Token for an Access Token
  30. Consumer (to the Service Provider): Please give me the acces token for the user
  31. consumer service provider oauth_consumer_key oauth_token (request token) oauth_signature_method oauth_signature oauth_timestamp oauth_nonce oauth_version (optional)
  32. Service Provider (to the Consumer): here is the access token for the user
  33. service provider consumer oauth_token (access token) oauth_token_secret [additional parameters]
  34. Epilogue Where the consumer accesses the resources
  35. Consumer (to the Service Provider): Here i am again on behalf of the user
  36. consumer service provider oauth_consumer_key oauth_token (access token) oauth_signature_method oauth_signature oauth_timestamp oauth_nonce oauth_version (optional) [additional parameters]
  37. The details...
  38. OAuth parameters exchange HTTP Authorization header HTTP Post body URL query parameters
  39. Request signing algorithm PLAINTEXT HMAC-SHA1 RSA-SHA1
  40. Signature base string a consistent reproducible concatenation of the request elements into a single string
  41. Other security measures Nonces Timestamps
  42. Service setup OAuth discovery (XRDS)
  43. <?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?> <XRDS xmlns=quot;xri://$xrdsquot;> <XRD xml:id=quot;oauthquot; xmlns:simple=quot;; xmlns=quot;xri://$XRD*($v*2.0)quot; version=quot;2.0quot;> <Type>xri://$xrds*simple</Type> <Expires>2008-12-31T23:59:59Z</Expires> <Service priority=quot;10quot;> <Type></Type> <LocalID>0685bd9184jfhq22</LocalID> </Service> <Service priority=quot;10quot;> <Type></Type> <Type></Type> <Type></Type> <Type></Type> </Service> <Service priority=quot;10quot;> <Type></Type> <Type></Type> <URI></URI> </Service> <Service priority=quot;10quot;> <Type></Type> <Type></Type> <Type></Type> <Type></Type> <URI></URI> </Service> <Service priority=quot;10quot;> <Type></Type> <Type></Type> <Type></Type> <Type></Type> <URI></URI> </Service> </XRD> <XRD xmlns=quot;xri://$XRD*($v*2.0)quot; version=quot;2.0quot;> <Type>xri://$xrds*simple</Type> <Service priority=quot;10quot;> <Type></Type> <URI>#oauth</URI> </Service> </XRD> </XRDS>
  44. Benefits Granular authorization Easy grant and revoke Tracking of use
  45. Many open/free libraries use them, contribute to them
  46. Challenges
  47. UI/UX for the Service Provider Provide basic informations to the user Ease the user’s choice Link / enable getting deeper info
  48. UI/UX for the Consumer Explain what’s happening Educate the user Use the right language
  49. Security considerations Confidentiality of Requests Spoofing, Proxying, Phishing Secrecy of credentials Cryptographic issues Denial of Service / Resource Exhaustion
  50. Beyond the browser Mobile devices Installable applications
  51. The sequel OAuth over XMPP
  52. <iq from='travelbot@findmenow.tld/bot' id='sub1' to='feeds.worldgps.tld' type='set'> <pubsub xmlns=''> <subscribe node='bard_geoloc'/> <oauth xmlns='urn:xmpp:tmp:oauth'> <oauth_consumer_key>0685bd9184jfhq22</oauth_consumer_key> <oauth_nonce>4572616e48616d6d65724c61686176</oauth_nonce> <oauth_signature>wOJIO9A2W5mFwDgiDvZbTSMK%2FPY%3D</oauth_signature> <oauth_signature_method>HMAC-SHA1</oauth_signature_method> <oauth_timestamp>1218137833</oauth_timestamp> <oauth_token>ad180jjd733klru7</oauth_token> <oauth_version>1.0</oauth_version> </oauth> </pubsub> </iq>
  53. The morale Integrating services can be done without asking or storing the user’s credentials while at the same time gaining flexibility and control.
  54. Links!
  55. Thanks for listening!! Luca Mearelli