public async Task <IActionResult> AdditionalAuthenticationFactor(
AdditionalAuthenticationFactorViewModel model)
{
// check if we are in the context of an authorization request
var context = await _interaction.GetAuthorizationContextAsync(model.ReturnUrl);
if (ModelState.IsValid)
{
// read identity from the temporary cookie
var result = await HttpContext.AuthenticateAsync("idsrv.mfa");
if (result?.Succeeded != true)
{
throw new Exception("MFA authentication error");
}
var subject = result.Principal.FindFirst(JwtClaimTypes.Subject)?.Value;
var user = await _localUserService.GetUserBySubjectAsync(subject);
var userSecret = await _localUserService.GetUserSecret(subject, "TOTP");
var authenticator = new TwoStepsAuthenticator.TimeAuthenticator();
if (!authenticator.CheckCode(userSecret.Secret, model.Totp, user))
{
ModelState.AddModelError("totp", "TOTP is invalid.");
return(View(model));
}
await _events.RaiseAsync(
new UserLoginSuccessEvent(
user.Username,
user.Subject,
user.Username,
clientId : context?.Client.ClientId));
// only set explicit expiration here if user chooses "remember me".
// otherwise we rely upon expiration configured in cookie middleware.
AuthenticationProperties props = null;
if (AccountOptions.AllowRememberLogin && model.RememberLogin)
{
props = new AuthenticationProperties
{
IsPersistent = true,
ExpiresUtc =
DateTimeOffset.UtcNow.Add(AccountOptions.RememberMeLoginDuration)
};
}
;
// delete temporary cookie used during mfa
await HttpContext.SignOutAsync("idsrv.mfa");
// issue authentication cookie with subject ID and username
var isuser = new IdentityServerUser(user.Subject)
{
DisplayName = user.Username
};
await HttpContext.SignInAsync(isuser, props);
if (context != null)
{
if (context.IsNativeClient())
{
// The client is native, so this change in how to
// return the response is for better UX for the end user.
return(this.LoadingPage("Redirect", model.ReturnUrl));
}
// we can trust model.ReturnUrl since GetAuthorizationContextAsync returned non-null
return(Redirect(model.ReturnUrl));
}
// request for a local page
if (Url.IsLocalUrl(model.ReturnUrl))
{
return(Redirect(model.ReturnUrl));
}
else if (string.IsNullOrEmpty(model.ReturnUrl))
{
return(Redirect("~/"));
}
else
{
// user might have clicked on a malicious link - should be logged
throw new Exception("invalid return URL");
}
}
return(View(model));
}
