How to limit access to access_token via OAuth2.0 scope parameter?

Use scope to fine-grained access to the access_token interface in OAuth2.0

In the OAuth2.0 authorization process, how to ensure that access_token can only access specific interfaces and avoid accessing other system interfaces is a key security issue. This problem is particularly prominent when Company A app nests Company B H5 pages, and the H5 page needs to access Company A user information.

Normally, after the company A app is authorized to the company B H5 page through OAuth2.0, the generated access_token theoretically has permission to access all interfaces of company A. In order to prevent security risks, Company A needs to implement access control policies.

scope parameter is the key to implementing this control. scope defines the permissions required by the client to request, and the user can optionally authorize. The authorization server generates access_token with corresponding permissions based on scope authorized by the user.

For example, Company A app only allows Company B H5 pages to access three interfaces: obtaining mobile phone number, obtaining user name, and obtaining user ID card. During the OAuth2.0 authorization process, Company B specifies access rights to these three interfaces through scope parameters. After the user confirms, the issued access_token only contains permissions for these interfaces.

When the Company H5 page uses access_token to request the Company A resource server, the resource server will verify scope information contained in access_token to determine whether to allow the request.

By configuring scope reasonably, access permissions of access_token can be effectively controlled to ensure that the B Company H5 page can only access predefined interfaces and avoid unauthorized access. This not only realizes interface isolation, but also improves users' control over the scope of authorization.

Therefore, scope is the core mechanism for implementing access_token permission control, which can accurately define and restrict access rights of third-party applications, enhance system security, and better protect user data.

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