Bearer Token Authentication in ASP.NET Core

Bearer Token Authentication in ASP.NET Core

Bearer token authentication is a method of authenticating users in ASP.NET Core using tokens that are passed in the Authorization header of HTTP requests. The bearer token contains information about the user and is signed with a secret key or a public key to verify its authenticity.

To enable bearer token authentication in ASP.NET Core, you can use the AddAuthentication and AddJwtBearer methods provided by the Microsoft.AspNetCore.Authentication.JwtBearer NuGet package. Here's an example:

using Microsoft.AspNetCore.Authentication.JwtBearer; using Microsoft.Extensions.DependencyInjection; using Microsoft.IdentityModel.Tokens; using System.Text; public class Startup { public void ConfigureServices(IServiceCollection services) { // Configure authentication services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme) .AddJwtBearer(options => { // Configure JWT options options.TokenValidationParameters = new TokenValidationParameters { ValidateIssuer = true, ValidateAudience = true, ValidateLifetime = true, ValidateIssuerSigningKey = true, ValidIssuer = "your-issuer", ValidAudience = "your-audience", IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your-secret-key")) }; }); // Add MVC services services.AddControllers(); } public void Configure(IApplicationBuilder app) { // Use authentication app.UseAuthentication(); // Use routing app.UseRouting(); // Use authorization app.UseAuthorization(); // Use endpoints app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); } }

In this example, we are configuring authentication using the AddAuthentication method and specifying the authentication scheme as JwtBearerDefaults.AuthenticationScheme. We are then using the AddJwtBearer method to configure the JWT options and specifying the token validation parameters.

The ValidateIssuer, ValidateAudience, ValidateLifetime, and ValidateIssuerSigningKey properties of the TokenValidationParameters class are used to specify which parts of the token should be validated. We are also specifying the valid issuer, audience, and signing key.

Once you have configured authentication, you can protect your API endpoints by adding the [Authorize] attribute to the controller or action methods that require authentication. When a user makes a request to an authorized endpoint, the bearer token will be validated and the user's identity will be established.

Examples

  1. "ASP.NET Core Bearer Token Authentication example"

    • Description: Learn the basics of implementing Bearer Token Authentication in an ASP.NET Core application.
    // Code Example services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme) .AddJwtBearer(options => { options.TokenValidationParameters = new TokenValidationParameters { ValidateIssuer = true, ValidateAudience = true, ValidateLifetime = true, ValidateIssuerSigningKey = true, ValidIssuer = "your-issuer", ValidAudience = "your-audience", IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your-secret-key")) }; });

  2. "ASP.NET Core JWT Bearer Token Authorization"

    • Description: Explore how to set up Bearer Token Authorization using JWT in ASP.NET Core.
    // Code Example [Authorize(AuthenticationSchemes = JwtBearerDefaults.AuthenticationScheme)] public class MyController : Controller { // Controller actions }

  3. "Generate JWT Bearer Token ASP.NET Core"

    • Description: Understand how to generate JWT Bearer Tokens programmatically in ASP.NET Core.
    // Code Example var tokenHandler = new JwtSecurityTokenHandler(); var key = Encoding.UTF8.GetBytes("your-secret-key"); var tokenDescriptor = new SecurityTokenDescriptor { Subject = new ClaimsIdentity(new[] { new Claim(ClaimTypes.Name, "your-username") }), Expires = DateTime.UtcNow.AddHours(1), SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature) }; var token = tokenHandler.CreateToken(tokenDescriptor); var tokenString = tokenHandler.WriteToken(token);

  4. "ASP.NET Core Bearer Token Authentication multiple issuers"

    • Description: Implement Bearer Token Authentication with support for multiple issuers in ASP.NET Core.
    // Code Example services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme) .AddJwtBearer(options => { options.TokenValidationParameters = new TokenValidationParameters { ValidateIssuer = true, ValidateAudience = true, ValidateLifetime = true, ValidateIssuerSigningKey = true, ValidIssuers = new List<string> { "issuer1", "issuer2" }, IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your-secret-key")) }; });

  5. "ASP.NET Core Bearer Token Authentication without HTTPS"

    • Description: Configure Bearer Token Authentication to work without requiring HTTPS in an ASP.NET Core application.
    // Code Example services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme) .AddJwtBearer(options => { options.RequireHttpsMetadata = false; // ... other configurations });

  6. "ASP.NET Core Bearer Token Authentication with OpenID Connect"

    • Description: Integrate Bearer Token Authentication with OpenID Connect in ASP.NET Core.
    // Code Example services.AddAuthentication(options => { options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme; options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme; }) .AddJwtBearer(options => { // ... JWT configurations }) .AddOpenIdConnect(options => { // ... OpenID Connect configurations });

  7. "ASP.NET Core Bearer Token Authentication Azure AD"

    • Description: Implement Bearer Token Authentication with Azure Active Directory (Azure AD) in ASP.NET Core.
    // Code Example services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme) .AddJwtBearer(options => { options.Audience = "your-client-id"; options.Authority = "https://login.microsoftonline.com/your-tenant-id"; });

  8. "ASP.NET Core Bearer Token Authentication multiple audiences"

    • Description: Configure Bearer Token Authentication to support multiple audiences in ASP.NET Core.
    // Code Example services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme) .AddJwtBearer(options => { options.TokenValidationParameters = new TokenValidationParameters { ValidAudiences = new List<string> { "audience1", "audience2" }, // ... other configurations }; });

  9. "ASP.NET Core Bearer Token Authentication with Refresh Tokens"

    • Description: Extend Bearer Token Authentication to support refresh tokens in ASP.NET Core.
    // Code Example services.AddAuthentication(options => { options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme; options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; }) .AddJwtBearer(options => { options.SaveToken = true; // ... other configurations });

  10. "ASP.NET Core Bearer Token Authentication custom claims"

    • Description: Add custom claims to Bearer Tokens in ASP.NET Core for more personalized authentication.
    // Code Example var claims = new List<Claim> { new Claim("custom-claim1", "value1"), new Claim("custom-claim2", "value2") }; var identity = new ClaimsIdentity(claims, JwtBearerDefaults.AuthenticationScheme);

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