Azure AD tokens (ID tokens, access tokens, and SAML tokens) by default last one hour. Asp.Net and Asp.Net Core Middleware sets their authentication ticket to the expiration of these tokens by default. If you do not want your web application to kick the user out redirecting them to Azure AD to sign-in again, you can customize the Middleware authentication ticket.


For Asp.Net…

In most cases within your Startup.Auth.cs under ConfigureAuth, you should have a line that says “app.UseCookieAuthentication()”

Update it so that it looks something like this… (This should work for all token types)

app.UseCookieAuthentication(new CookieAuthenticationOptions()
{
  CookieManager = new Microsoft.Owin.Host.SystemWeb.SystemWebChunkingCookieManager(),
  Provider = new CookieAuthenticationProvider()
  {
    OnResponseSignIn = (context) =>
    {
      context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
    }
  }
});


Asp.Net Core…

In Asp.Net Core, we essentially need to add the OnTokenValidated event to update the ticket properties to set when the ticket will expire before it decides to redirect to Azure AD to sign-in again.

options.Events.OnTokenValidated = async context =>
    {
      context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
    };

Below are a few examples on how to do this…

If you’re using the following similar code to add Azure AD authentication…

services.AddAuthentication(AzureADDefaults.AuthenticationScheme)
  .AddAzureAD(options => Configuration.Bind("AzureAd", options))

Then add the following…

services.Configure<OpenIdConnectOptions>(AzureADDefaults.OpenIdScheme, options =>
{
  //…
  options.Events.OnTokenValidated = async context =>
  {
    context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
  };
});

So your configuration would look something like this inside your startup.cs…

public void ConfigureServices(IServiceCollection services)
{
  //...

  services.AddAuthentication(AzureADDefaults.AuthenticationScheme)
    .AddAzureAD(options => Configuration.Bind("AzureAd", options))
    .AddCookie();

  //...

  services.Configure<OpenIdConnectOptions>(AzureADDefaults.OpenIdScheme, options =>
  {
    //...
    options.Events.OnTokenValidated = async context =>
    {
      context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
    };
  });

  //...
}

If you’re using “Microsoft.Identity.Web” to add your Azure AD configuration, then you could update your code to look something like this…

//…
using Microsoft.Identity.Web;
//…
public class Startup
{
  // ...
  public void ConfigureServices(IServiceCollection services)
  {
    // ...
    services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)
      .AddMicrosoftIdentityWebApp(options =>
      {
        Configuration.Bind("AzureAD", options);
        options.Events ??= new OpenIdConnectEvents();
        options.Events.OnTokenValidated = async context =>
        {
          context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
        };
      });
    // ...
}			

If you’re implementing your own custom OpenIdConnectOptions to configure Azure AD authentication, then add the following…

services.Configure<OpenIdConnectOptions>(options =>
{
  //…
  options.Events.OnTokenValidated = async context =>
  {
    context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
  };
});

If you’re integrating a Asp.Net Core WS-Fed application, then it might look something like this…

public void ConfigureServices(IServiceCollection services)
{
  services.AddAuthentication(WsFederationDefaults.AuthenticationScheme)  
    .AddCookie()
    .AddWsFederation(options =>
    {
      options.SignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;

      // MetadataAddress for your Azure Active Directory instance.
      options.MetadataAddress = "https://login.microsoftonline.com/common/federationmetadata/2007-06/federationmetadata.xml";

      // Wtrealm is the app's identifier in the Active Directory instance.
      // For ADFS, use the relying party's identifier, its WS-Federation Passive protocol URL:
      options.Wtrealm = "https://localhost:44307/";

      // For AAD, use the Application ID URI from the app registration's Overview blade:
      options.Wtrealm = "https://contoso.onmicrosoft.com/wsfedapp";

      // Set the Authentication Ticket to expire at a custom time            
      options.Events.OnSecurityTokenValidated = async context =>
      {
        context.Properties.ExpiresUtc = DateTimeOffset.UtcNow.AddHours(12);
      }

More Information…

Notice that these are actually setting the “Ticket” expiration. You can set this expiration to whatever you like.

Keep in mind if you’re modifying these expirations, the user will continue to access your web app even if they have been deleted or disabled in Azure AD.

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