Oauth implementation By using CLient Id and Client Credentials

Question

how can i Secure Web API by using Client Id and Seceret Key? what is the best way to do it? How can we authorize the API?

Mohammad Hussain · Answer

// Startup.cs using Microsoft.Owin; using Microsoft.Owin.Security.OAuth; using Owin; using System; public class Startup { public void Configuration(IAppBuilder app) { app.UseOAuthAuthorizationServer(new OAuthAuthorizationServerOptions { TokenEndpointPath = new PathString("/token"), Provider = new MyOAuthProvider(), // Implement the custom OAuth provider AccessTokenExpireTimeSpan = TimeSpan.FromMinutes(60), AllowInsecureHttp = true, // Only set to true for testing purposes, use HTTPS in production }); app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions()); } } // MyOAuthProvider.cs using Microsoft.Owin.Security.OAuth; using System.Security.Claims; using System.Threading.Tasks; public class MyOAuthProvider : OAuthAuthorizationServerProvider { public override async Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context) { string clientId; string clientSecret; if (context.TryGetBasicCredentials(out clientId, out clientSecret) || context.TryGetFormCredentials(out clientId, out clientSecret)) { // Validate the Client Id and Client Secret against your registered values if (clientId == "your_client_id" && clientSecret == "your_client_secret") { context.Validated(clientId); } else { context.SetError("invalid_client", "Invalid Client Id or Client Secret"); context.Rejected(); } } else { context.SetError("invalid_client", "Client credentials could not be retrieved from the request"); context.Rejected(); } } public override async Task GrantClientCredentials(OAuthGrantClientCredentialsContext context) { var identity = new ClaimsIdentity(context.Options.AuthenticationType); // Add any specific claims for the API client if needed identity.AddClaim(new Claim("client_id", context.ClientId)); context.Validated(identity); } }

Mahendra Prasad · Answer

HI how can i perform this in .net framework 4.5? and we have registered/bound SSO service. using SSO service, we have clientid, client secret, uri aswell.

Cr Bhargavi · Answer

Please try running as follows 1. **Install IdentityServer Package:** Install-Package IdentityServer4 2. **Configure IdentityServer:** Set up IdentityServer by configuring the client applications and API resources. You can do this in your `Startup.cs` file. using IdentityServer4.Models; // Inside ConfigureServices method services.AddIdentityServer() .AddInMemoryClients(new List { new Client { ClientId = "your_client_id", ClientSecrets = { new Secret("your_client_secret".Sha256()) }, AllowedGrantTypes = GrantTypes.ClientCredentials, AllowedScopes = { "your_api_scope" } } }) .AddInMemoryApiScopes(new List { new ApiScope("your_api_scope", "Your API Scope Description") }) .AddInMemoryApiResources(new List { new ApiResource("your_api_scope", "Your API Scope") }) .AddDeveloperSigningCredential(); // For development purposes only; use a valid signing certificate in production 3. **Configure Authentication and Authorization for the API:** In your `Startup.cs`, configure authentication and authorization for your API. // Inside Configure method app.UseAuthentication(); app.UseAuthorization(); 4. **Protect Your API Endpoints:** To protect specific API endpoints, use the `[Authorize]` attribute on the controllers or actions that require authorization. [ApiController] [Route("api/[controller]")] public class YourController : ControllerBase { [HttpGet] [Authorize] public IActionResult Get() { // Your API logic return Ok("Protected endpoint accessed successfully."); } } 5. **Requesting Access Tokens:** Clients (such as mobile apps or other services) can request access tokens using their Client ID and Secret Key to access your API. 6. **Access Token Validation:** In your API, validate the access tokens received from clients using IdentityServer's middleware. 7. **Securely Store Client Secret:** Ensure that the Client Secret Key is securely stored and not exposed in your application's code. Use secure configuration mechanisms, such as environment variables, to store sensitive information