The action has an attribute on it because we need to be logged in, to know which user we want to authorize. String user = (c => c.Type.equals = ClaimTypes.Name) ĬodeAndURIStorage.Save(code, redirect_uri)
Asp.net core 2.0 authentication code#
Generate authorization code and save it together with userId and recirect_uri Return Redirect(redirect_uri + "?error=access_denied") If (!clientValidator.Valid(client_id, client_secret)) Return Redirect(redirect_uri + "?error=unsupported_response_type") Check if code is correct and if client credentials are correct. Public async Task authorize(string response_type, string client_id, string redirect_uri, string redirect_uri, string state) The action that receives these parameters could look like this.
Asp.net core 2.0 authentication password#
The client must also authenticate itself which can either be done using HTTP Basic Authentication or by using the extra argument client_secret which contains a secret password known to the client. state is a random string that is used to identify the flow. redirect_uri specify the URI that the server should redirect back to once the access is authorized. client_id specifying the client since only registered clients should be allowed to use the Authorization server. In the redirect, the client must attach some arguments: response_type which must be "code" since we use the Authorization Code flow. Here the user must first authenticate themselves which can be done using cookie authentication when using ASP.NET Cone as explained in this post: Cookie authentication with social providers in ASP.NET Core. Authorization code request and responseįirst, the client is redirected to the website of the authorization server. It's important to use HTTPS for this standard since there is a lot of communication between the different actors with arguments that should not be known to potential eavesdroppers. The way the Authorization Code flow exposes the user to the Authorization server is through the browser. A lot of the other flows handle all communication with the authorization server internally and does not expose the user to the other service. The most used flow in modern applications for both mobile and web is the Authorization Code flow. The access token is what can be used to query an API to get the information requested access to. The goal of all the flows is to get an access token, though. There are a lot of different flows under OAuth 2.0 that can be used in different scenarios. In this article, I will show how you can use JSON Web Tokens (JWT) to implement the OAuth 2.0 Authorization Code flow directly with ASP.NET Core while keeping your choice of persistent storage open.
But these packages all either require you to use a relational database like MSSQL, set up additional web applications and/or offer too many options which can make it confusing and hard to learn. To secure your API with OAuth there are a couple of options already like Identity Server 4, OpenIddict, and ASOS. When a service needs information from your GitHub or Google account, you authorize that using OAuth before they can get the data. OAuth 2.0 is an authorization standard, that you probably already used somehow.
Written by Kristoffer Strube, June 30, 2020
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