An illustrated crash course for OAuth and OIDC

In this talk, we will embark on an illustrated journey to demystify OAuth 2.1 and OpenID Connect (OIDC). We will start by exploring the fundamental concepts of these two protocols, their roles in modern authentication and authorization, and the problems they solve in the realm of identity and access management.

1. Demystifying OAuth and OIDC An illustrated crash course Deepu K Sasidharan
2. @oktaDev | @deepu105 | deepu.tech ➔ JHipster co-chair ➔ Java Champion ➔ Creator of KDash, JDL Studio, JWT UI ➔ Developer Advocate @ Okta ➔ OSS aficionado, polyglot dev, author, speaker Hi, I’m Deepu K Sasidharan @deepu105@mastodon.social deepu.tech @deepu105 deepu05
3. @oktaDev | @deepu105 | deepu.tech Authorization Process of determining whether a user has the necessary permissions to access a resource.
4. @oktaDev | @deepu105 | deepu.tech OAuth OAuth is the industry-standard protocol for delegated authorization.
5. @oktaDev | @deepu105 | deepu.tech OAuth OAuth 1.0 →No longer used OAuth 2.0 →Widely used version OAuth 2.1 →Latest version
6. @oktaDev | @deepu105 | deepu.tech System Roles Resource Owner →End user Resource Server →API Server Client →System requesting access Authorization Server →Authenticate and issue tokens
7. @oktaDev | @deepu105 | deepu.tech System Roles
8. @oktaDev | @deepu105 | deepu.tech Tokens Access Token →Authorization to access a resource Authorization Code →Short lived token to get an access token Refresh Token →Long lived token to get new access tokens
9. @oktaDev | @deepu105 | deepu.tech Claim →KV pair assertion with user info Scope →Group of claims or permission limiting access
10. @oktaDev | @deepu105 | deepu.tech OAuth 2.0 Grants Authorization Code Grant →Exchange authorization code for access token (secure clients) Implicit Grant →Get access token directly (SPA, native apps) Client Credentials Grant →Access token without user interaction (confidential clients) Resource Owner Password Credentials Grant →Access token using user credentials (trusted clients)
11. @oktaDev | @deepu105 | deepu.tech Authorization Code Grant →Exchange authorization code for access token (secure clients) Authorization Code Grant with PKCE →Exchange authorization code for access token (secure clients, SPAs, native apps) OAuth 2.0 Grants OAuth 2.1 Grants Implicit Grant →Get access token directly (SPA, native apps) Implicit Grant →Get access token directly (SPA, native apps) Client Credentials Grant →Access token without user interaction (confidential clients) Resource Owner Password Credentials Grant →Access token using user credentials (trusted clients) Resource Owner Password Credentials Grant →Access token using user credentials (trusted clients)
12. @oktaDev | @deepu105 | deepu.tech OAuth 2.1 Grants Authorization Code Grant with PKCE →Exchange authorization code for access token (secure clients, SPAs, native apps) Client Credentials Grant →Access token without user interaction (confidential clients)
13. @oktaDev | @deepu105 | deepu.tech Other Grants Refresh Token Grant→Exchange refresh token for access token Extension Grants →Device Authorization Grant, Token Exchange Grant, etc.
14. @oktaDev | @deepu105 | deepu.tech OAuth 2 Flows
15. @oktaDev | @deepu105 | deepu.tech Implicit Grant Flow (Not recommended) Authorization request { client_id, response_type=token, redirect_uri=..., scope, state, etc } Token request NA
16. @oktaDev | @deepu105 | deepu.tech Resource Owner Password Credentials Grant Flow (Not recommended) Authorization request NA Token request { client_id, client_secret, username, password, grant_type=password }
17. @oktaDev | @deepu105 | deepu.tech Authorization Code Grant Flow (Not recommended) Authorization request { client_id, response_type=code, redirect_uri=..., scope, state, etc } Token request { client_id, client_secret, authorization_code, grant_type=authorization_code, redirect_uri, etc }
18. @oktaDev | @deepu105 | deepu.tech Authorization Code Grant Flow with PKCE Authorization request { client_id, response_type=code, redirect_uri=..., code_challenge, scope, state, etc, } Token request { client_id, code_verifier, authorization_code, grant_type=authorization_code, redirect_uri, etc }
19. @oktaDev | @deepu105 | deepu.tech Client Credentials Grant Flow Authorization request NA Token request { client_id, client_secret, grant_type=client_credentials }
20. @oktaDev | @deepu105 | deepu.tech Refresh Token Grant Flow Authorization request NA Token request { client_id, client_secret, refresh_token, grant_type=refresh_token }
21. @oktaDev | @deepu105 | deepu.tech Device Authorization Grant Flow Device Authorization request { client_id, scope, } Token request { client_id, device_code, grant_type=urn:ietf:params :oauth:grant-type:device_code }
22. @oktaDev | @deepu105 | deepu.tech Authentication Process of verifying the identity of a user. OAuth lacked a standard way to authenticate users.
23. @oktaDev | @deepu105 | deepu.tech OpenID Connect OpenID Connect (OIDC) is an identity layer built on top of the OAuth 2.0 framework
24. @oktaDev | @deepu105 | deepu.tech OIDC using Authorization Code Grant Flow with PKCE Authorization request { client_id, response_type=code, redirect_uri=..., code_challenge, scope=’openid,..’, state, etc, } Token request { client_id, code_verifier, authorization_code, grant_type=authorization_code, redirect_uri, etc }
25. @oktaDev | @deepu105 | deepu.tech You are now an OAuth expert!
26. @oktaDev | @deepu105 | deepu.tech OAuth2 and OIDC workshop for Java Developers
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