CIS14: Working with OAuth and OpenID Connect
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Roland Hedberg, Umeå University All you need to know about OpenID Connect, with concrete examples and hands-on demos that illustrate how OpenID Connect can be used in web and mobile scenarios.
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CIS14: Working with OAuth and OpenID Connect
- 1. OAuth 2.0 and OpenID Connect Basics From OAuth2 to OpenID Connect by Roland Hedberg
- 2. Let’s start with OAuth2
- 3. ❖ The OAuth 2.0 authorization framework enables a third-party application to obtain limited access to an HTTP service, ! ❖ either on behalf of a resource owner by orchestrating an approval interaction between the resource owner and the HTTP service, ! ❖ or by allowing the third-party application to obtain access on its own behalf.
- 4. The players Authorization Server Resource ServerClient
- 5. Authorization Request Authorization Server Resource Server Client Authorization request
- 6. Authorization Request - details Parameters! client_id! redirect_uri! response_type! scope! state Authorization Server Resource Server Client Authorization request GET! http://example.com/authorization?state=1521671980316802035&! ! redirect_uri=https://example.org/authz_cb&! ! response_type=code&! ! client_id=SFEBuhC7sp3a
- 7. Authorization Server Resource Server Client AUTHENTICATION HAPPENS & End-user consent/authorization
- 8. Authorization Response Authorization Server Resource Server Client Authorization response
- 9. Authorization Response - details Authorization Server Resource Server Client Authorization response GET! https://example.org/authz_cb?state=1521671980316802035&! ! code=s87BT60pp2UbNX2HnkWpZ9YhPVHRZaoTuU9XJul6JMuQaKUidUM6y1Boab6 Parameters code! state access_token! token_type! expires_in! scope! state
- 10. Access Token Request Authorization Server Resource Server Client Access token request
- 11. Access Token Request - details POST! http://example.com/token! ! code=s87BT60pp2UbNX2HnkWpZ9YhPVHRZaoTuU9XJul6JMuQaKUidUM6y1Boab6&! ! grant_type=authorization_code&! ! redirect_uri=https://example.org/authz_cb Authorization Server Resource Server Client Access token request Parameters! client_id! code! grant_type! redirect_uri
- 12. Access Token Response Authorization Server Resource Server Client Access token response
- 13. Access Token Response - details {! ! 'access_token': ’s87BT60pp2UbNX2HnkWpfPfWNo9Gi7chACuWoa2IDND', ! ! 'expires_in': 3600, ! ! 'refresh_token': ’s87BT60pp2U+bNX2HnkWpVCnDYPsy8EOpI’! ! 'state': ’STATE0’,! ! 'token_type': 'Bearer', ! } Authorization Server Resource Server Client Access token response Parameters! access_token! expires_in! refresh_token scope! token_type
- 14. Resource Access Authorization Server Resource Server Client Resource request/response
- 15. Resource Access - details Authorization Server Resource Server Client Resource request/response GET! https://example.com/resource! ! Header:! ! Authorization: ’Bearer s87BT60pp2UbNX2HnkWpfPfWNo9Gi7chACuWoa2IDND’!
- 16. The whole Authorization Server Resource Server Client Authorization request Authorization Server Resource Server Client Authorization response Authorization Server Resource Server Client Access token request Authorization Server Resource Server Client Access token response Authorization Server Resource Server Client Resource request/response Authorization Server Resource Server Client AUTHENTICATION HAPPENS & End-user consent/authorization
- 17. Flows ❖ Authorization Code Grant! ❖ Implicit Grant! ❖ Resource Owner Password Credentials Grant! ❖ Client Credentials Grant
- 18. Implicit grant Authorization Server Resource Server Client Authorization request Authorization Server Resource Server Client Resource request/response Authorization Server Resource Server Client Authorization response Authorization Server Resource Server Client AUTHENTICATION HAPPENS & End-user consent/authorization
- 19. Resource Owner Password Credentials Grant & Client Credentials Grant Authorization Server Resource Server Client Access token request Authorization Server Resource Server Client Access token response Authorization Server Resource Server Client Resource request/response
- 20. From OAuth2 to OpenID Connect
- 21. ❖ OpenID Connect 1.0 is a simple identity layer on top of the OAuth 2.0 protocol. ! ❖ It enables Clients to verify the identity of the End-User based on the authentication performed by an Authorization Server, as well as to obtain basic profile information about the End-User in an interoperable and REST-like manner.
- 22. The differences ❖ Only authorization grant and implicit grant flows! ❖ Dynamic provider discovery and client registration! ❖ ID Token! ❖ Additions/Clarifications/Constrictions! ❖ UserInfo endpoint
- 23. Flows ❖ Authorization code! ❖ Implicit! ❖ Hybrid (authorization code with a twist)! ❖ code id_token! ❖ code token! ❖ code id_token token
- 24. Dynamic provider discovery and client registration
- 25. Dynamic discovery and registration 1. Find the provider! 2. Discover provider info! 3. Register client
- 26. 1.Find the provider ❖ Webfinger (RFC 7033)! ❖ User identifier -> URL! ❖ carol@example.org ->! ! GET /.well-known/webfinger?! resource=acct:carol@example.com&! rel=http://openid.net/specs/connect/1.0/issuer! HTTP/1.1! Host: example.com
- 27. Webfinger response HTTP/1.1 200 OK! Access-Control-Allow-Origin: *! Content-Type: application/jrd+json! ! {! "subject" : "acct:carol@example.com",! "links" :! [ {! "rel" : "http://openid.net/specs/connect/1.0/issuer",! "href" : "https://openid.example.com"! } ]! }
- 28. 2.Discover provider info - query GET /.well-known/openid-configuration HTTP/1.1! Host: openid.example.com
- 29. 2. Discover provider info - response ❖ issuer! ❖ jwks_uri! ❖ endpoints! ❖ functions supported! ❖ support for signing/encrypting algorithms! ❖ policy/tos
- 30. Required information ❖ issuer! ❖ jwks_uri! ❖ authorization_endpoint! ❖ token_endpoint (*)! ❖ response_types_supported! ❖ subject_types_supported! ❖ id_token_signing_alg_supported
- 31. 3. Client registration ❖ uris! ❖ application information! ❖ support for signing/encrypting algorithms! ❖ key material! ❖ server behavior! ❖ client behavior
- 33. Client registration response ❖ client_id! ❖ possibly client_secret and if so client_secret_experies_at! ❖ and the Authorization servers view of things
- 34. An Authorization Server ❖ MAY add fields the client didn’t include.! ❖ MAY reject or replace any of the Client's requested field values and substitute them with suitable values.! ❖ MAY ignore values provided by the client, and MUST ignore any fields sent by the Client that it does not understand.
- 35. A Client can not ❖ modify a registration! ❖ delete a registration
- 36. ID Token
- 37. ID Token ❖ Have to make a detour into JWT/K/A/S/E land
- 38. JWT ❖ Jason Web Token! ❖ a compact URL-safe means of representing claims to be transferred between two parties! ❖ Suggested pronunciation: ’jot’
- 39. JWS represents content secured with digital signatures or Message Authentication Codes (MACs) using JavaScript Object Notation (JSON) based data structures. JWE represents encrypted content using JavaScript Object Notation (JSON) based data structures.
- 40. JWK a JavaScript Object Notation (JSON) data structure that represents a cryptographic key JWA registers cryptographic algorithms and identifiers to be used with the JSON Web Signature(JWS), JSON Web Encryption (JWE), and JSON Web Key (JWK) specifications
- 41. ID Token ❖a security token that contains Claims about the Authentication of an End-User by an Authorization Server when using a Client, and potentially other requested Claims. ! ❖is represented as a JSON Web Token (JWT)
- 42. ID Token claims -required ❖ iss - Issuer Identifier for the Issuer of the response! ❖ sub - Subject Identifier! ❖ aud - Intended audience! ❖ exp - Expiration time! ❖ iat - Issued at! ❖ auth_time - Authentication time! ❖ nonce
- 43. ID Token claims - optional ❖ acr - Authentication Context Class Reference! ❖ amr - Authentication Method References! ❖ azp - Authorized party
- 45. OAuth2 Authorization Request - details Parameters! client_id! redirect_uri! response_type! scope! state Authorization Server Resource Server Client Authorization request GET! http://example.com/authorization?state=1521671980316802035&! ! redirect_uri=https://example.org/authz_cb&! ! response_type=code&! ! client_id=SFEBuhC7sp3a
- 46. Authentication Request - OpenID Connect extensions ❖ response_mode - The mechanism to use for returning parameters! ❖ nonce - Associates client session with ID Token! ❖ Signed/encrypted Authentication Request! ❖ End-user interactions! ❖ Response details
- 47. Signed/encrypted Authentication Request ❖ request - by value! ❖ request_uri - by reference! ! ❖ Single self-contained parameter! ❖ Signed and/or encrypted (JWT)
- 48. End-user interactions ❖ display - How to display pages to End-User! ❖ prompt - If the End-User should be prompted for re-authentication/ consent! ❖ max_age - allowed max time since last authentication! ❖ ui_locales - End-User’s preferred languages and scripts! ❖ id_token_hint - ID Token previously issued ! ❖ login_hint - login identifier the End-User might want to use! ❖ acr_values - requested Authentication Context Class Reference values
- 49. Response details ❖ claims! ❖ user_info! ❖ id_token! ! ❖ claims specification! ❖ null! ❖ essential! ❖ value! ❖ values
- 51. User info ❖ sub! ❖ name! ❖ given_name! ❖ family_name! ❖ middle_name! ❖ nickname! ❖ preferred_username Set of standard claims ❖ profile! ❖ picture! ❖ website! ❖ email! ❖ email_verified! ❖ gender! ❖ birthdate ❖ zoneinfo! ❖ locale! ❖ phone_number! ❖ phone_number_verfied! ❖ address! ❖ updated_at!
- 52. claims types ❖ Normal! ❖ Aggregated! ❖ Distributed
- 53. Summary ❖ OAuth2 is about authorization! ❖ OpenID Connect adds authentication and identity information
- 54. Questions ?