Ajouter un mode d'authentification sur une appli existante (ASP.NET Identity/OWIN)

Hello,

On a actuellement une application web ASP.NET MVC 5. Jusqu'à présent, on utilisait uniquement Azure Active Directory pour l'authentification des utilisateurs. Pour cela, nous avons mis en place OWIN et tout fonctionne parfaitement.

Aujourd'hui on a une nouvelle problématique : ajouter un mode d'authentification local avec une base de données SQL Server, toujours en utilisant OWIN. On arrive à créer ce mode d'authentification sans problème, on l'a d'ailleurs un peu personnalisé dans un projet à part. Lorsqu'on lance ce projet en mode debug, on arrive à s'authentifier normalement.

Maintenant on doit intégrer ce projet à part dans notre appli existante (qui utilise déjà OWIN mais pour Azure AD). Le problème c'est qu'on ne voit pas comment faire pour que les 2 modes d'authentification coexistent ensemble...

Est-ce que quelqu'un ici aurait une idée ?

[EDIT]
En attendant, voici le code du fichier Startup.Auth.cs de notre appli existante:

Code:

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public partial class Startup
{
	public void ConfigureAuth(IAppBuilder app)
	{
		var db = new ApplicationDbContext();
 
		app.SetDefaultSignInAsAuthenticationType(CookieAuthenticationDefaults.AuthenticationType);
 
		app.UseCookieAuthentication(new CookieAuthenticationOptions
		{
			CookieSecure = CookieSecureOption.SameAsRequest,
			ExpireTimeSpan = TimeSpan.FromMinutes(15)
		});
 
		app.UseOpenIdConnectAuthentication(
			new OpenIdConnectAuthenticationOptions
			{
				ClientId = AuthenticationConfiguration.ClientId,
				Authority = AuthenticationConfiguration.Authority,
				TokenValidationParameters = new TokenValidationParameters
				{
					// Instead of using the default validation (validating against a single issuer value, as we do in line of business apps), 
					// we inject our own multitenant validation logic.
					ValidateIssuer = false,
				},
 
				Notifications = new OpenIdConnectAuthenticationNotifications
				{
					AuthorizationCodeReceived = async context =>
					{
						var code = context.Code;
 
						var credential = new ClientCredential(AuthenticationConfiguration.ClientId, AuthenticationConfiguration.ClientSecret);
						var tenantId = context.AuthenticationTicket.Identity.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid").Value;
						var signedInUserId = context.AuthenticationTicket.Identity.FindFirst(ClaimTypes.NameIdentifier).Value;
 
						var authContext = new AuthenticationContext($"https://login.microsoftonline.com/{tenantId}", new EFADALTokenCache(signedInUserId));
						var result = await authContext.AcquireTokenByAuthorizationCodeAsync(
							code, new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path)), credential, GraphConfiguration.GraphUrl);
					},
 
					RedirectToIdentityProvider = context =>
					{
						// This ensures that the address used for sign in and sign out is picked up dynamically from the request
						// this allows you to deploy your app (to Azure Web Sites, for example) without having to change settings.
						// Remember that the base URL of the address used here must be provisioned in Azure AD beforehand.
						var appBaseUrl = context.Request.Scheme + "://" + context.Request.Host + context.Request.PathBase;
						context.ProtocolMessage.RedirectUri = appBaseUrl + "/";
						context.ProtocolMessage.PostLogoutRedirectUri = appBaseUrl;
 
						return Task.FromResult(0);
					},
 
					// We use this notification for injecting our custom logic.
					SecurityTokenValidated = context =>
					{
						// Retrieve caller data from the incoming principal.
						var issuer = context.AuthenticationTicket.Identity.FindFirst("iss").Value;
						var upn = context.AuthenticationTicket.Identity.FindFirst(ClaimTypes.Name).Value;
						var tenantId = context.AuthenticationTicket.Identity.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid").Value;
 
						// If we go into this bloc, we must stop the authentication flow.
						if ((db.Tenants.FirstOrDefault(a => ((a.IssValue == issuer) && (a.AdminConsented))) == null) && // The caller comes from an admin-consented, recorded issuer.
							(db.Users.FirstOrDefault(b => ((b.Upn == upn) && (b.TenantId == tenantId))) == null)) // The caller is recorded in the db of users who went through the individual onboardoing.
						{
							// The caller was neither from a trusted issuer or a registered user - throw to block the authentication flow.
							throw new SecurityTokenValidationException();
						}
 
						return Task.FromResult(0);
					},
					AuthenticationFailed = (context) =>
					{
						Logger.Error("StartupAuth Exception: " + context.Exception?.Message + " - Inner: " + context.Exception?.InnerException?.Message);
 
						// As the authentication failed, we force a sign out to ensure there is no remaining token/cookie.
						context.OwinContext.Authentication.SignOut(OpenIdConnectAuthenticationDefaults.AuthenticationType, CookieAuthenticationDefaults.AuthenticationType);
 
						//TODO: Redirect to / but for development purposes it is more helpful to redirect there.
						context.OwinContext.Response.Redirect("/Home/Error");
						context.HandleResponse(); // Suppress the exception
 
						return Task.FromResult(0);
					}
				}
			});
	}
}

Si besoin d'autres infos, merci de me le faire savoir.