The Many Layers of OAuth

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The Many Layers Of OAuth Danger Casey API Problem Solver, GTM Guy, General Nuisance [email protected] May 2023

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01 Who am I?

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02 OAuth Vocab

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© ngrok. All rights reserved. Confidential Information of ngrok © ngrok. All rights reserved. Confidential Information of ngrok Which is better: OAuth or OpenID Connect? Trick question: OIDC is part of OAuth

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No content

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© ngrok. All rights reserved. Confidential Information of ngrok - Resource Owner is you - Grant Type (aka Flow) describes the use case - Tokens represents the authorization, user or state - Authorization Server (aka Auth Server) creates the tokens - Scopes are the permissions you request from the Auth Server - Claims are the fields & data returned from the Auth Server - Resource Server is where you use the auth and id tokens Key OAuth Terms

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© ngrok. All rights reserved. Confidential Information of ngrok - Resource Owner is you - Grant Type how you get the tokens - Tokens are the tokens - Authorization Server creates the tokens - Scopes how you request stuff in the token - Claims the stuff in the token - Resource Server where you use the token Key OAuth Terms (simplified)

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03 Grant Types

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04 Which should I use?

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© ngrok. All rights reserved. Confidential Information of ngrok - Authorization Code Flow - Implicit Flow - Resource Owner Password Flow - Client Credentials Flow Extensions - Authorization Code Flow with PKCE - SAML 2.0 Assertion Flow - Device Grant Type - Okta: Interaction Grant Type Grant Types (aka OAuth flows)

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© ngrok. All rights reserved. Confidential Information of ngrok - Authorization Code Flow - Implicit Flow - deprecated in favor of Auth Code+PKCE - Resource Owner Password Flow - not recommended - Client Credentials Flow Extensions - Authorization Code Flow with PKCE - SAML 2.0 Assertion Flow - Device Flow - Okta: Interaction Grant Type Grant Types (aka OAuth flows)

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Specifications 05

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© ngrok. All rights reserved. Confidential Information of ngrok OIDC: Opinionated Structure ● openid ● profile ● email ● address ● phone ● name ● given_name ● email ● street_address ● phone_number And many more..

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© ngrok. All rights reserved. Confidential Information of ngrok ● RFC 6749 OAuth Core ● RFC 7519 JSON Web Token ● RFC 7662 Token Introspection ● RFC 7009 Token Revocation ● OpenID Connect Specification ● RFC 8414 Authorization Server Metadata Discovery More Pieces!

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06 Closing Thoughts

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© ngrok. All rights reserved. Confidential Information of ngrok © ngrok. All rights reserved. Confidential Information of ngrok Figure out which combo of specs you need & they have *RFC 8414 is your best friend

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Thank you

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The Many Layers Of OAuth Danger Casey API Problem Solver, GTM Guy, General Nuisance [email protected] May 2023