dex

dex is a federated identity management service. It provides OpenID Connect (OIDC) to users, while it proxies to multiple remote identity providers (IdP) to drive actual authentication.

Architecture

dex consists of multiple components:

• dex-worker is the primary server component of dex
  • host a user-facing API that drives the OIDC protocol
  • proxy to remote identity providers via "connectors"
• dex-overlord is an auxiliary process responsible for two things:
  • rotation of keys used by the workers to sign identity tokens
  • garbage collection of stale data in the database
• dexctl is CLI tool used to manage an dex deployment
  • configure identity provider connectors
  • administer OIDC client identities

A typical dex deployment consists of N dex-workers behind a load balanacer, and one dex-overlord. The dex-workers directly handle user requests, so the loss of all workers can result in service downtime. The single dex-overlord runs its tasks periodically, so it does not need to maintain 100% uptime.

Connectors

Remote IdPs could implement any auth-N protocol. connectors contain protocol-specific logic and are used to communicate with remote IdPs. Possible examples of connectors could be: OIDC, LDAP, Local Memory, Basic Auth, etc. dex ships with an OIDC connector, and a basic "local" connector for in-memory testing purposes. Future connectors can be developed and added as future interoperability requirements emerge.

Relevant Specifications

These specs are referenced and implemented to some degree in the jose package of this project.

• JWK
• JWT
• JWS

OpenID Connect (OIDC) is broken up into several specifications. The following (amongst others) are relevant:

• OpenID Connect Core 1.0
• OpenID Connect Discovery 1.0
• OAuth 2.0 RFC

Example OIDC Discovery Endpoints

• https://accounts.google.com/.well-known/openid-configuration
• https://login.salesforce.com/.well-known/openid-configuration

Building

With Host Go Environment

./build

With Docker

./go-docker ./build

Docker Build and Push

Binaries must be compiled first. Builds a docker image and pushes it to the quay repo. The image is tagged with the git sha and 'latest'.

export QUAY_USER=xxx
export QUAY_PASSWORD=yyy
./build-docker-push

Rebuild API from JSON schema

Go API bindings are generated from a JSON Discovery file. To regenerate run:

./schema/generator

For updating generator dependencies see docs in: schema/generator_import.go.

Runing Tests

Run all tests: ./test

Single package only: PKG=<pkgname> ./test

Functional tests: ./test-functional

Run with docker:

./go-docker ./test
./go-docker ./test-functional

Running

Run the main dex server:

After building, run ./bin/dex and provider the required arguments. Additionally start ./bin/dex-overlord for key rotation and database garbage collection.

Deploying

Generate systemd unit files by injecting secrets into the unit file templates located in: ./static/....

source <path-to-secure>/prod/dex.env.txt
./build-units

Resulting unit files are output to: ./deploy

Registering Clients

Like all OAuth2 servers clients must be registered with a callback url. New clients can be registered with the dexctl CLI tool:

dexctl --db-url=postgres://localhost/auth?sslmode=disable new-client http://example.com/auth/callback

The tool will print the client-id and client-secret to stdout; you must save these for use in your client application. The output of this command is "KEY=VALUE" format, so If you eval it in your shell, the relevant variables are available to use.

Note that for the initial invocation of dexctl you need to provide a DSN URL to create a new-client. Once you have created this initial client, you can use its client-id and client-secret as credentials to dexctl, and make requests via the HTTP API instead of the DB:

dexctl --endpoint=http://your-issuer-url --client-id=your_client_id --client-secret=your_client_secret new-client

or, if you want to go the eval route:

eval "$(dexctl --endpoint=http://your-issuer-url --client-id=your_client_id --client-secret=your_client_secret new-client)"

The latter form makes the variables DEX_APP_CLIENT_ID, DEX_APP_CLIENT_SECRET and DEX_APP_REDIRECTURL_0 available to your shell.

This will allow you to create new clients from machines that cannot hit the database.

Standup Dev Script

A script which will create a database, create a client, start an overlord and a worker and start the example app exists at contrib/standup-db.sh.

Coming Soon

• Multiple backing Identity Providers
• Identity Management
• Authorization