mockoidc

A Mock OpenID Connect Server for Authentication Unit and Integration Tests.

Created by @NickMeves and @egrif during the Greenhouse Software 2021 Q1 Hack Day.

Usage

Import the package

import "github.com/oauth2-proxy/mockoidc"

Start the MockOIDC Server. This will spin up a minimal OIDC server in its own goroutine. It will listen on localhost on a random port.

Then pull its configuration to integrate it with your application. Begin testing!

m, _ := mockoidc.Run()
defer m.Shutdown()

cfg := m.Config()
// type Config struct {
//   	ClientID     string
//   	ClientSecret string
//   	Issuer       string
//   
//   	AccessTTL  time.Duration
//   	RefreshTTL time.Duration
// }

RunTLS

Alternatively, if you provide your own tls.Config, the server can run with TLS:

tlsConfig = &tls.Config{
    // ...your TLS settings
}

m, _ := mockoidc.RunTLS(tlsConfig)
defer m.Shutdown()

Endpoints

The following endpoints are implemented. They can either be pulled from the OIDC discovery document (m.Issuer() + "/.well-known/openid-configuration) or retrieved directly from the MockOIDC server.

m, _ := mockoidc.Run()
defer m.Shutdown()

m.Issuer()
m.DiscoveryEndpoint()
m.AuthorizationEndpoint()
m.TokenEndpoint()
m.UserinfoEndpoint()
m.JWKSEndpoint()

Seeding Users and Codes

By default, calls to the authorization_endpoint will start a session as if the mockoidc.DefaultUser() had logged in, and it will return a random code for the token_endpoint. The User in the session started by this call to the authorization_endpoint will be the one in the tokens returned by the subsequent token_endpoint call.

These can be seeded with your own test Users & codes that will be returned:

m, _ := mockoidc.Run()
defer m.Shutdown()

user := &mockoidc.User{
    // User details...
}

// Add the User to the queue, this will be returned by the next login
m.QueueUser(user)

// Preset the code returned by the next login
m.QueueCode("12345")

// ...Request to m.AuthorizationEndpoint()

Forcing Errors

Arbitrary errors can also be queued for handlers to return instead of their default behavior:

m, err := mockoidc.Run()
defer m.Shutdown()

m.QueueError(&mockoidc.ServerError{
    Code: http.StatusInternalServerError,
    Error: mockoidc.InternalServerError,
    Description: "Some Custom Description",
})

Manipulating Time

To accurately test token expiration scenarios, the MockOIDC server's view of time is completely mutable.

You can override the server's view of time.Now

mockoidc.NowFunc = func() { //...custom logic }

As tests are running, you can fast-forward time to critical test points (e.g. Access & Refresh Token expirations).

m, _ := mockoidc.Run()

m.FastForward(time.Duration(1) * time.Hour)

Synchronizing with jwt-go time

Even though we can fast-forward time, the underlying tokens processed by the jwt-go library still have timing logic.

We need to synchronize our timer with theirs:

m, _ := mockoidc.Run()
defer m.Shutdown()

// Overrides jwt.TimeFunc to m.Now
reset := m.Synchronize()

// reset is a mockoidc.ResetTime function that reverts jwt.TimeFunc to
// its original state
defer reset()

Manual Configuration

Everything started up with mockoidc.Run() can be done manually giving the opportunity to finely tune the settings:

// Create a fresh RSA Private Key for token signing
rsaKey, _ := rsa.GenerateKey(rand.Reader, 2048)

// Create an unstarted MockOIDC server
m, _ := mockoidc.NewServer(rsaKey)

// Create the net.Listener on the exact IP:Port you want
ln, _ := net.Listen("tcp", "127.0.0.1:8080")

tlsConfig = &tls.Config{
    // ...your TLS settings
}

// tlsConfig can be nil if you want HTTP
m.Start(ln, tlsConfig)
defer m.Shutdown()

Nearly all the MockOIDC struct is public. If you want to update any settings to predefined values (e.g. clientID, clientSecret, AccessTTL, RefreshTTL) you can before calling m.Start.

Additional internal components of the MockOIDC server are public if you need to tamper with them as well:

type MockOIDC struct {
	// ...other stuff

	// Normally, these would be private. Expose them publicly for
	// power users.
	Server       *http.Server
	Keypair      *Keypair
	SessionStore *SessionStore
	UserQueue    *UserQueue
	ErrorQueue   *ErrorQueue
}

Adding Middleware

When configuring the MockOIDC server manually, you have the opportunity to add custom middleware before starting the server (e.g. request logging, test validators, etc).

m, _ := mockoidc.NewServer(nil)

middleware := func(next http.Handler) http.Handler {
    return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
        // custom middleware logic here...
        next.ServeHTTP(rw, req)
        // custom middleware logic here...
    })
}

m.AddMiddleware(middleware)