OAuth or JWT? Which one to use and why?

问题:

I am starting to learn about token based authentication and I am trying to learn how to implement it in Laravel 5. I have come across two very popular technologies for doing this but I am confused since I am new to both these technologies.

This article at Medium says I should go with lucadegasperi/oauth2-server-laravel which I am sure is a very popular package in the community judging by the number of stars on Github and the number of references that have led me to it. This one is supposed to help me with OAuth implementation.

This other article at Scotch.io encourages me to use tymondesigns/jwt-auth which is also very popular again judging by the number of stars on Github.

At this point I am indecisive of which one to use mostly because I am a novice developer and I haven't worked with either of them.

Could anyone point out to me what are the pros and cons to each one of them and which one I should implement? Will my project type also dictate what kind I should use? And how?

Moreover if you are making an argument that I should choose one over the other, could you also point out good resources that would help me start with them. Other than the two links I provided myself of course.

回答1:

JWT is a simple authentication protocol, Oauth is an authentication framework.

An experienced developer will take about a month to fully understand and implement Oauth. An experienced developer can pick up the JWT protocol in about a day of reading the specifications. So basically, it boils down to your specific use-case.

If you want simple stateless http authentication to an api, then JWT is just fine and relatively quick to implement, even for a novice developer.

A few JWT resources for you:

• http://jwt.io/
• https://auth0.com/docs
• http://www.toptal.com/web/cookie-free-authentication-with-json-web-tokens-an-example-in-laravel-and-angularjs

And an Oauth resource:

• http://tutorials.jenkov.com/oauth2/overview.html

回答2:

JWT stands for JSON Web Token as the name suggest it is only a token for transferring secured data among two parties, that is client and server.

Oauth2 on other had is a set of rules or a procedure commonly called a framework that help to authenticate and authorize two parties to transfer secured data.

Following diagram will explain how oauth2 works

Here is a more detailed explanation of the steps in the diagram:

1. The application requests authorization to access service resources from the user
2. If the user authorized the request, the application receives an authorization grant
3. The application requests an access token from the authorization server (API) by presenting authentication of its own identity, and the authorization grant
4. If the application identity is authenticated and the authorization grant is valid, the authorization server (API) issues an access token to the application. Authorization is complete.
5. The application requests the resource from the resource server (API) and presents the access token for authentication
6. If the access token is valid, the resource server (API) serves the resource to the application

Both these can be used together in transferring secure data.

Where JWT come into play in 3rd 6th steps of oauth2

回答3:

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA.

OAuth 2.0 is protocol for authorization. OAuth 2.0 supersedes the work done on the original OAuth protocol created in 2006. OAuth 2.0 focuses on client developer simplicity while providing specific authorization flows for web applications, desktop applications, mobile phones, and living room devices. This specification is being developed within the IETF OAuth WG.

- The OAuth We have different types of tokens.

1) WS-Security tokens, especially SAML tokens

2) JWT tokens

3) Legacy tokens

4) Custom tokens

The most important thing to understand when comparing JWT and OAuth2, is that they are not alike. Or even incompatible.

JWT is an authentication protocol This means it is a strict set of instructions for the issuing and validating of signed access tokens. The tokens contain claims that are used by an app to limit access to a user.

OAuth2 is an authentication framework OAuth2 on the other hand is a framework, think very detailed guideline, for letting users and applications authorize specific permissions to other applications in both private and public settings.

Few good links:

• [1]: https://community.apigee.com/questions/21139/jwt-vs-oauth.html

• [2]: https://youtu.be/XGmUlyggXVo

• [3]: http://www.seedbox.com/en/blog/2015/06/05/oauth-2-vs-json-web-tokens-comment-securiser-un-api/