Auth Token in Web API

Question

I have a Web API that uses ASP.NET Identity. Users are authenticated using a bearer token and refresh token. I want to implement a feature where if a user changes their password or their current refresh token becomes invalid, they will be automatically logged out from all devices. How can I achieve this?

Jayraj Chhaya · Answer

To achieve automatic logout in ASP.NET Identity when a user changes their password or their refresh token becomes invalid, you can follow these steps: Implement a custom RefreshTokenProvider class that inherits from IAuthenticationTokenProvider . This class will handle the generation and validation of refresh tokens. In the CreateAsync method of the RefreshTokenProvider class, generate a new refresh token and associate it with the user's identity. Store this refresh token in a secure location, such as a database. In the ReceiveAsync method of the RefreshTokenProvider class, validate the incoming refresh token. If the token is valid, retrieve the associated user's identity and check if their password has been changed or if the refresh token has become invalid. If either condition is true, invalidate all existing refresh tokens for the user. In your API controllers, whenever a user changes their password or their refresh token becomes invalid, call the InvalidateUserTokensAsync method of the UserManager class to invalidate all existing refresh tokens for the user. Here's an example of how you can implement the RefreshTokenProvider class: public class CustomRefreshTokenProvider : IAuthenticationTokenProvider { public async Task CreateAsync(AuthenticationTokenCreateContext context) { // Generate a new refresh token var refreshToken = Guid.NewGuid().ToString("n"); // Associate the refresh token with the user's identity context.Ticket.Properties.IssuedUtc = DateTime.UtcNow; context.Ticket.Properties.ExpiresUtc = DateTime.UtcNow.AddDays(30); context.Ticket.Properties.Dictionary["refreshToken"] = refreshToken; // Store the refresh token in a secure location // (e.g., database or distributed cache) await YourTokenStorageService.StoreRefreshTokenAsync(refreshToken, context.Ticket); } public async Task ReceiveAsync(AuthenticationTokenReceiveContext context) { // Validate the incoming refresh token var refreshToken = context.Token; var ticket = await YourTokenStorageService.RetrieveRefreshTokenAsync(refreshToken); if (ticket != null) { // Retrieve the associated user's identity var user = await YourUserManager.GetUserAsync(ticket.Identity); // Check if the user's password has been changed // or if the refresh token has become invalid if (user.PasswordChangedUtc > ticket.Properties.IssuedUtc || !await YourTokenStorageService.IsRefreshTokenValidAsync(refreshToken)) { // Invalidate all existing refresh tokens for the user await YourTokenStorageService.InvalidateUserTokensAsync(user.Id); } } } } To register the CustomRefreshTokenProvider class in your ASP.NET Identity configuration, add the following code in your Startup class: public void ConfigureAuth(IAppBuilder app) { // ... app.UseOAuthBearerTokens(new OAuthAuthorizationServerOptions { // ... RefreshTokenProvider = new CustomRefreshTokenProvider() }); // ... }

Naimish Makwana · Answer

You can achieve this by using the SecurityStamp feature in ASP.NET Identity. Here’s how you can do it: After the user changes their password, you need to update the SecurityStamp 1. Here’s an example: await UserManager.ChangePasswordAsync(User.Identity.GetUserId(), model.OldPassword, model.NewPassword); await UserManager.UpdateSecurityStampAsync(User.Identity.GetUserId()); If you want the user to remain logged in on the current device, you have to reissue a new authentication cookie1: await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false); To log out all other sessions immediately, you need to lower the check interval in the config1: app.UseCookieAuthentication(new CookieAuthenticationOptions { AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie, LoginPath = new PathString("/Account/Login"), Provider = new CookieAuthenticationProvider { OnValidateIdentity = SecurityStampValidator.OnValidateIdentity ( validateInterval: TimeSpan.FromSeconds(1), regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager)) } }); This will invalidate all previous authentication cookies when the SecurityStamp is changed1. Therefore, if a user changes their password or their refresh token becomes invalid, they will be automatically logged out from all devices1. Please note that the user/session who initiated the password change will also be logged out unless a new authentication cookie is issued1. Thanks

Ajay Kumar · Answer

@Naimish Makwana I have already used this method but I am using the WEB API. If a user has already created a bearer token and continues to create a refresh token, how can I invalidate the current refresh token?