.NET 10: What’s New for Authentication and Authorization

Tue, 02 Dec 2025 14:21:27 +0000

Why This Matters Now

With the increasing complexity of modern web applications, robust and flexible authentication and authorization mechanisms are crucial. The recent release of .NET 10 brings significant enhancements in these areas, making it easier for developers to implement secure and efficient identity management solutions. As of March 2024, these updates address common pain points and provide new features that can streamline your development process and enhance your application’s security posture.

🚨 Security Alert: Misconfigured authentication can lead to severe vulnerabilities. Ensure you leverage the latest features in .NET 10 to protect your applications.

Improved JWT Handling

One of the most notable improvements in .NET 10 is the enhanced support for JSON Web Tokens (JWT). JWTs are widely used for securing APIs and managing user sessions due to their compact size and self-contained nature. The new features make it simpler to validate and generate JWTs, reducing boilerplate code and improving performance.

Simplified JWT Validation

In previous versions of .NET, setting up JWT validation required several steps and boilerplate configuration. With .NET 10, this process has been streamlined. Let’s compare the old and new ways:

Old Way

services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = Configuration["Jwt:Issuer"],
        ValidAudience = Configuration["Jwt:Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["Jwt:Key"]))
    };
});

New Way

.NET 10 introduces a more concise and intuitive way to configure JWT validation using the AddJwtBearer method with a simplified options pattern.

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = Configuration["Jwt:Issuer"],
            ValidAudience = Configuration["Jwt:Audience"],
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["Jwt:Key"]))
        };
    });

🎯 Key Takeaways

Simplified JWT validation setup reduces boilerplate code.
Improved readability and maintainability of authentication configurations.

Enhanced JWT Generation

Generating JWTs in .NET 10 is also more straightforward. The new SecurityTokenDescriptor class simplifies the creation of tokens.

Example

var tokenHandler = new JwtSecurityTokenHandler();
var key = Encoding.ASCII.GetBytes(Configuration["Jwt:Key"]);
var tokenDescriptor = new SecurityTokenDescriptor
{
    Subject = new ClaimsIdentity(new Claim[]
    {
        new Claim(ClaimTypes.Name, user.Username),
        new Claim(ClaimTypes.Role, user.Role)
    }),
    Expires = DateTime.UtcNow.AddDays(7),
    SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
};
var token = tokenHandler.CreateToken(tokenDescriptor);
var tokenString = tokenHandler.WriteToken(token);

return Ok(new { Token = tokenString });

💜 Pro Tip: Always store your secret keys securely and avoid hardcoding them in your source code.

Enhanced OpenID Connect Support

OpenID Connect (OIDC) is a protocol built on top of OAuth 2.0 for authentication. It provides a way for applications to verify the identity of a user and obtain basic profile information. .NET 10 offers several enhancements to simplify OIDC integration.

Simplified Configuration

Configuring OIDC in .NET 10 is more intuitive, thanks to the new AddOpenIdConnect method with a streamlined options pattern.

Example

services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
})
.AddCookie()
.AddOpenIdConnect(options =>
{
    options.Authority = "https://your-auth-server.com";
    options.ClientId = "your-client-id";
    options.ClientSecret = "your-client-secret";
    options.ResponseType = "code";
    options.SaveTokens = true;
    options.GetClaimsFromUserInfoEndpoint = true;
    options.ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "sub");
    options.ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
});

🎯 Key Takeaways

Easier configuration of OpenID Connect providers.
Automatic handling of claims mapping from the user info endpoint.

Improved Token Management

.NET 10 includes improvements in token management, such as automatic refresh of access tokens and better handling of token expiration.

Example

services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
})
.AddCookie()
.AddOpenIdConnect(options =>
{
    options.Authority = "https://your-auth-server.com";
    options.ClientId = "your-client-id";
    options.ClientSecret = "your-client-secret";
    options.ResponseType = "code";
    options.SaveTokens = true;
    options.UsePkce = true; // Proof Key for Code Exchange
    options.GetClaimsFromUserInfoEndpoint = true;
    options.ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "sub");
    options.ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
    options.Events.OnTokenResponseReceived = async context =>
    {
        var refreshToken = context.TokenEndpointResponse.RefreshToken;
        // Store the refresh token securely
    };
});

⚠️ Warning: Always handle refresh tokens securely to prevent unauthorized access.

Role-Based Access Control (RBAC) Enhancements

Role-Based Access Control (RBAC) is a widely used method for managing permissions in applications. .NET 10 introduces several enhancements to RBAC, making it easier to define and enforce role-based policies.

Policy-Based Authorization

Policy-based authorization allows you to define complex authorization logic using policies. .NET 10 simplifies the creation and application of policies.

Example

services.AddAuthorization(options =>
{
    options.AddPolicy("CanEdit", policy => policy.RequireClaim(ClaimTypes.Role, "Editor"));
    options.AddPolicy("CanDelete", policy => policy.RequireClaim(ClaimTypes.Role, "Admin"));
});

// In your controller
[Authorize(Policy = "CanEdit")]
public IActionResult Edit(int id)
{
    // Edit logic here
    return View();
}

[Authorize(Policy = "CanDelete")]
public IActionResult Delete(int id)
{
    // Delete logic here
    return View();
}

🎯 Key Takeaways

Define and enforce complex authorization policies easily.
Separate authorization logic from business logic for cleaner code.

Role-Based Authorization

Role-based authorization is simpler than policy-based but equally powerful for many scenarios. .NET 10 makes it easy to apply roles directly in your controllers.

Example

// In your controller
[Authorize(Roles = "Admin, Editor")]
public IActionResult ManageUsers()
{
    // Manage users logic here
    return View();
}

💜 Pro Tip: Use role-based authorization for simple scenarios and policy-based for complex ones.

Custom Authorization Handlers

For more advanced authorization scenarios, .NET 10 allows you to create custom authorization handlers. This feature provides flexibility to implement custom authorization logic.

Example

public class CustomAuthorizationRequirement : IAuthorizationRequirement
{
    public string Permission { get; }

    public CustomAuthorizationRequirement(string permission)
    {
        Permission = permission;
    }
}

public class CustomAuthorizationHandler : AuthorizationHandler
{
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, CustomAuthorizationRequirement requirement)
    {
        var userPermission = context.User.FindFirstValue("Permission");

        if (userPermission == requirement.Permission)
        {
            context.Succeed(requirement);
        }

        return Task.CompletedTask;
    }
}

// Register the handler
services.AddSingleton();

// Define the policy
services.AddAuthorization(options =>
{
    options.AddPolicy("CustomPermission", policy => policy.Requirements.Add(new CustomAuthorizationRequirement("Edit")));
});

// Apply the policy
[Authorize(Policy = "CustomPermission")]
public IActionResult CustomAction()
{
    // Custom action logic here
    return View();
}

🎯 Key Takeaways

Create custom authorization handlers for advanced scenarios.
Implement complex authorization logic tailored to your application's needs.

Security Improvements

Security is paramount in any application, and .NET 10 includes several security improvements related to authentication and authorization.

Secure Token Storage

Storing tokens securely is crucial to prevent unauthorized access. .NET 10 provides built-in support for secure storage of tokens using data protection APIs.

Example

services.AddDataProtection()
    .PersistKeysToFileSystem(new DirectoryInfo(@"\\server\keys\"))
    .ProtectKeysWithDpapi();

services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
})
.AddCookie()
.AddOpenIdConnect(options =>
{
    options.Authority = "https://your-auth-server.com";
    options.ClientId = "your-client-id";
    options.ClientSecret = "your-client-secret";
    options.ResponseType = "code";
    options.SaveTokens = true;
    options.UsePkce = true;
    options.GetClaimsFromUserInfoEndpoint = true;
    options.ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "sub");
    options.ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
    options.Events.OnTokenResponseReceived = async context =>
    {
        var refreshToken = context.TokenEndpointResponse.RefreshToken;
        // Store the refresh token securely using data protection
        var protectedToken = context.HttpContext.Protect(refreshToken);
        // Save the protected token to your storage
    };
});

🚨 Security Alert: Always protect sensitive data, such as tokens, using data protection APIs.

Cross-Site Request Forgery (CSRF) Protection

Cross-Site Request Forgery (CSRF) attacks can be mitigated by enabling CSRF protection in .NET 10. This feature ensures that only requests from trusted sources are processed.

Example

services.AddAntiforgery(options =>
{
    options.HeaderName = "X-CSRF-TOKEN";
});

// In your controller
[ValidateAntiForgeryToken]
public IActionResult SubmitForm(MyModel model)
{
    // Form submission logic here
    return View();
}

💜 Pro Tip: Always enable CSRF protection to prevent malicious requests.

Conclusion

.NET 10 brings significant enhancements to authentication and authorization, making it easier to build secure and efficient applications. From improved JWT handling to enhanced OpenID Connect support, these updates address common pain points and provide new features that can streamline your development process. By leveraging these new capabilities, you can ensure that your applications are secure and scalable.

✅ Best Practice: Stay updated with the latest .NET releases to take advantage of new security features and improvements.

.NET on IAMDevBox

.NET 10: What’s New for Authentication and Authorization

Why This Matters Now

Improved JWT Handling

Simplified JWT Validation

Old Way

New Way

🎯 Key Takeaways

Enhanced JWT Generation

Example

Enhanced OpenID Connect Support

Simplified Configuration

Example

🎯 Key Takeaways

Improved Token Management

Example

Role-Based Access Control (RBAC) Enhancements

Policy-Based Authorization

Example

🎯 Key Takeaways

Role-Based Authorization

Example

Custom Authorization Handlers

Example

🎯 Key Takeaways

Security Improvements

Secure Token Storage

Example

Cross-Site Request Forgery (CSRF) Protection

Example

Conclusion