Open-source OAuth 2.0 / OIDC toolkit for .NET 10+

CoreIdent is a complete, open-source authentication toolkit for .NET 10+. Add secure OAuth 2.0 / OpenID Connect to your app in minutes—with full code-level control and no vendor lock-in.

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddCoreIdent(o => {
    o.Issuer = "https://auth.example.com";
    o.Audience = "https://api.example.com";
});
builder.Services.AddSigningKey(o => o.UseRsa("/path/to/key.pem"));

var app = builder.Build();
app.MapCoreIdentEndpoints();
app.Run();

That's it. You now have token issuance, OIDC discovery, JWKS, and more.

• Token endpoint — client_credentials, refresh_token, authorization_code (PKCE required), password (deprecated)
• Authorization Code + PKCE — Full flow with consent UI
• OIDC discovery & JWKS — Standards-compliant metadata and public key publishing
• Token revocation (RFC 7009) & introspection (RFC 7662)
• Passwordless authentication — Email magic links, passkeys/WebAuthn, SMS OTP
• Pluggable storage — In-memory for dev, EF Core for production
• Secure by default — RS256/ES256 signing, refresh token rotation, theft detection
• CLI tool — dotnet coreident init, key generation, client management
• Metrics — OpenTelemetry-compatible via System.Diagnostics.Metrics
• Aspire integration — Health checks, distributed tracing, service defaults

dotnet run --project tests/CoreIdent.TestHost

Visit /.well-known/openid-configuration to see the discovery document.

dotnet new install CoreIdent.Templates
dotnet new coreident-server -n MyAuthServer
cd MyAuthServer && dotnet run

Available templates:

• coreident-api — Minimal API with token endpoints
• coreident-server — Full server with consent UI and passkeys
• coreident-api-fsharp — F# version

builder.Services.AddDbContext<CoreIdentDbContext>(options =>
    options.UseSqlite(builder.Configuration.GetConnectionString("CoreIdent")));
builder.Services.AddEntityFrameworkCoreStores();

CoreIdent is MIT-licensed and open source. See CONTRIBUTING.md to get started.

MIT