O auth
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OAuth 2.0 is an authorization framework that allows third-party applications to obtain limited access to a user's data on another service, either on behalf of the user by facilitating an approval interaction or by obtaining access on its own behalf. It addresses the issue of sharing user credentials by introducing an authorization layer and separating the client from the resource owner. The client requests access to resources controlled by the resource owner and hosted by the resource server, and is issued a token rather than the user's credentials.
O auth
- 2. Introduction 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. OAuth addresses issue of sharing resource owner’s credentials to access protected resources by introducing an authorization layer and separating the role of the client from that of the resource owner. In OAuth, the client requests access to resources controlled by the resource owner and hosted by the resource server, and is issued a different set of credentials than those of the resource owner. The client obtains an access token -- a string denoting a specific scope, lifetime, and other access attributes. Access tokens are issued to third-party clients by an authorization server with the approval of the resource owner. The client uses the access token to access the protected resources hosted by the resource server.
- 3. Terminology Access token - A token used to access protected resources. Authorization code - An intermediary token generated when a user authorizes a client to access protected resources on their behalf.The client receives this token and exchanges it for an access token. Authorization server - A server which issues access tokens after successfully authenticating a client and resource owner, and authorizing the request. Client - An application which accesses protected resources on behalf of the resource owner (such as a user).The client could be hosted on a server, desktop, mobile or other device. Client Id and Client secret Grant - A grant is a method of acquiring an access token. Resource server - A server which sits in front of protected resources (for example “tweets”, users’ photos, or personal data) and is capable of accepting and responding to protected resource requests using access tokens. Resource owner -The user who authorizes an application to access their account.The application’s access to the user’s account is limited to the “scope” of the authorization granted (e.g. read or write access). Scope - A permission.
- 4. Grant flow
- 5. Client Credentials Grant token_type expires_in access_token grant_type | client_id | client_secret | scope
- 6. Authorization Grant response_type| client_id | redirect_uri | scope | state code | state grant_type | client_id | client_secret | redirect_uri | code token_type | expires_in | access_token | refresh_token
- 7. Password Grant grant_type| client_id | client_secret | scope | username |password token_type | expires_in | access_token | refresh_token
- 8. ImplicitGrant response_type| client_id | redirect_uri | scope | state token_type | expires_in | access_token | state