Sustainsys Saml2 Handler AuthenticateAsync() method operation is not implemented - asp.net-core

Question

I'm trying a simple implementation in my Asp net Core application of Saml2 to integrate with an Ad FS server. I can't figure why I am getting this error. I downloaded the samples from the gitHub and tried to adapt it in my application.
NotImplementedException: The method or operation is not implemented.
Sustainsys.Saml2.AspNetCore2.Saml2Handler.AuthenticateAsync()
Here's my implementation, my application is running on Asp Net Core
On StartUp
services
.AddAuthentication(sharedOptions =>
{
sharedOptions.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
sharedOptions.DefaultChallengeScheme = Saml2Defaults.Scheme;
})
.AddSaml2(options =>
{
options.SPOptions.EntityId = new EntityId("http://myAdfsServer.myDomain.com/adfs/services/trust");
options.SPOptions.ReturnUrl = new Uri("https://localhost:5000");
options.IdentityProviders.Add(
new IdentityProvider(new EntityId("http://myAdfsServer.myDomain.com/adfs/services/trust"), options.SPOptions)
{
LoadMetadata = true,
MetadataLocation = "https://myAdfsServer.myDomain.com/FederationMetadata/2007-06/FederationMetadata.xml"
//MetadataLocation = "FederationMetadata.xml"
});
//options.SPOptions.ServiceCertificates.Add(new X509Certificate2(certificate.ToString()));
})
.AddCookie();
On my Controller
trying something similar to Sustainsys SAML2 Sample for ASP.NET Core WebAPI without Identity
[Authorize(AuthenticationSchemes = Saml2Defaults.Scheme)]
public class AuthenticationController : Controller
{
public AuthenticationController()
{
}
[AllowAnonymous]
public async Task LoginAdfs()
{
string redirectUri = string.Concat("https://localhost:5000", "/verifyAdfs");
try
{
new ChallengeResult(
Saml2Defaults.Scheme,
new AuthenticationProperties
{
RedirectUri = Url.Action(nameof(LoginCallback), new { redirectUri })
});
}catch(Exception e)
{
}
}
[AllowAnonymous]
public async Task<IActionResult> LoginCallback(string returnUrl)
{
var authenticateResult = await HttpContext.AuthenticateAsync(Saml2Defaults.Scheme);
//_log.Information("Authenticate result: {#authenticateResult}", authenticateResult);
// I get false here and no information on claims etc.
if (!authenticateResult.Succeeded)
{
return Unauthorized();
}
var claimsIdentity = new ClaimsIdentity("Email");
claimsIdentity.AddClaim(authenticateResult.Principal.FindFirst(ClaimTypes.NameIdentifier));
// _log.Information("Logged in user with following claims: {#Claims}", authenticateResult.Principal.Claims);
await HttpContext.SignInAsync("Email", new ClaimsPrincipal(claimsIdentity));
return LocalRedirect(returnUrl);
}
}
note: I've got a client that won't expose his MetaData in a URL, so I'll need to adapt it and set manually the metadata parameters
I'm stuck in this error, I does not even hit my method LoginAdfs.

Answer 1

The Saml2 handler cannot be used as an authencation scheme, it is a challenge scheme.
I guess that the LoginAdfs() method works fine, but that it's the LoginCallback that fails. The reason should be the call to HttpContext.AuthenticationAsync(Saml2Defaults.Scheme).
You should instead authenticate with the cookie scheme - because that's what keeps the session. Internally when the challenge is completed, the Saml2 handler will use the DefaultSignInScheme to preserve the result in a session (through a cookie, as that's the default sign in scheme).