Asp.Net Core - simplest possible forms authentication

Question

I have this old MVC5 application that uses forms authentication in the simplest possible form. There is only one account stored in web.config, there are no roles etc.

<authentication mode="Forms">
  <forms loginUrl="~/Login/Index" timeout="30">
    <credentials passwordFormat="Clear">
      <user name="some-user" password="some-password" />
    </credentials>
  </forms>
</authentication>

The login routine just calls

FormsAuthentication.Authenticate(name, password);

And that's it. Is there something similar (in terms of simplicity) in asp.net core?

Answer 1

It is not that simple :)

1. In the Startup.cs, configure method.

   app.UseCookieAuthentication(options =>
   {
     options.AutomaticAuthenticate = true;
     options.AutomaticChallenge = true;
     options.LoginPath = "/Home/Login";
   });
   

2. Add Authorize attribute to protect the resources you want to secure.

   [Authorize]
   public IActionResult Index()
   {
     return View();
   }
   

3. In the Home Controller, Login Post action method, write the following method.

   var username = Configuration["username"];
   var password = Configuration["password"];
   if (authUser.Username == username && authUser.Password == password)
   {
     var identity = new ClaimsIdentity(claims, 
         CookieAuthenticationDefaults.AuthenticationScheme);
   
     HttpContext.Authentication.SignInAsync(
       CookieAuthenticationDefaults.AuthenticationScheme,
       new ClaimsPrincipal(identity));
   
     return Redirect("~/Home/Index");
   }
   else
   {
     ModelState.AddModelError("","Login failed. Please check Username and/or password");
   }
   

Here is the github repo for your reference : https://github.com/anuraj/CookieAuthMVCSample