asp.net - Add claims on successful login and retrieve it elsewhere in the application

Question

Please I need assistance in implementing a custom way of assigning claims to authenticated users. On successful login,

var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout: false);
        switch (result)
        {
            case SignInStatus.Success:
                //Get the user
                ApplicationUser user = UserManager.FindByEmail(model.Email);
                //Ends here
                ClaimsIdentity identity = await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);
                AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = true }, identity);

I use the userId to fetch the role and other information about the user from the datastore. Thereafter, I need to add claims about the user with those information such as email, role, firstName, Lastname, gender, etc. before redirecting to the user dashboard. This is the way I try to do it but the problem is that even after adding the claims at the login method, I am not able to retrieve it at the _loginPartial razor view

For instance when I want to display the email claim value at the login partial like this

var claims = ClaimsPrincipal.Current.Claims;
    var principal = (ClaimsPrincipal)Thread.CurrentPrincipal;
    var email = principal.Claims.Where(c => c.Type == ClaimTypes.Email).Select(c => c.Value).SingleOrDefault();

It returns null.

So, as a result, I can only access them on the same login method after adding them but I need to be able to access it from anywhere in the application. Please I will appreciate any assistance on how to be able to retrieve these claims anywhere else throughout the application.

Thank you.

Answer 1

You must add your claims before login not after. Consider this example:

public async Task<ActionResult> Login(LoginViewModel model,string returnUrl)
{
    var user = UserManager.Find(model.Email, model.Password);
    if(user!=null)
    {
        var ident = UserManager.CreateIdentity(user, 
            DefaultAuthenticationTypes.ApplicationCookie);
        ident.AddClaims(new[] {
            new Claim("MyClaimName","MyClaimValue"),
            new Claim("YetAnotherClaim","YetAnotherValue"),
        });
        AuthenticationManager.SignIn(
            new AuthenticationProperties() { IsPersistent = true }, 
            ident);
        return RedirectToLocal(returnUrl);
    }
    ModelState.AddModelError("", "Invalid login attempt.");
    return View(model);
}

Now since we have injected our claims while signing in, we have access to claims wherever we want:

((ClaimsIdentity)User.Identity).FindFirst("MyClaimName");

Also you could add your claims in ApplicationUser.GenerateUserIdentityAsync() method. By adding your claims in this method you could use SignInManager.PasswordSignInAsync() method to sign in users without any modification to default Login action method.

public class ApplicationUser : IdentityUser
{
    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        // Add custom user claims here
        userIdentity .AddClaims(new[] {
            new Claim("MyClaimName","MyClaimValue"),
            new Claim("YetAnotherClaim","YetAnotherValue"),
        });
        return userIdentity;
    }
}