Authentik forward auth to microbin

authentik-docker-compose.yaml

---
version: '3.4'

services:
  postgresql:
    image: docker.io/library/postgres:14-alpine
    restart: unless-stopped
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -d $${POSTGRES_DB} -U $${POSTGRES_USER}"]
      start_period: 20s
      interval: 30s
      retries: 5
      timeout: 5s
    volumes:
      - database:/var/lib/postgresql/data
    environment:
      - POSTGRES_PASSWORD=${PG_PASS:?database password required}
      - POSTGRES_USER=${PG_USER:-authentik}
      - POSTGRES_DB=${PG_DB:-authentik}
    # env_file:
    #   - .env
  redis:
    image: docker.io/library/redis:alpine
    command: --save 60 1 --loglevel warning
    restart: unless-stopped
    healthcheck:
      test: ["CMD-SHELL", "redis-cli ping | grep PONG"]
      start_period: 20s
      interval: 30s
      retries: 5
      timeout: 3s
    volumes:
      - redis:/data
  server:
    image: ${AUTHENTIK_IMAGE:-ghcr.io/goauthentik/server}:${AUTHENTIK_TAG:-2022.8.2}
    restart: unless-stopped
    command: server
    environment:
      AUTHENTIK_REDIS__HOST: redis
      AUTHENTIK_POSTGRESQL__HOST: postgresql
      AUTHENTIK_POSTGRESQL__USER: ${PG_USER:-authentik}
      AUTHENTIK_POSTGRESQL__NAME: ${PG_DB:-authentik}
      AUTHENTIK_POSTGRESQL__PASSWORD: ${PG_PASS}
      AUTHENTIK_ERROR_REPORTING__ENABLED: "true"
      AUTHENTIK_SECRET_KEY: ${AUTHENTIK_SECRET_KEY:?secret key required}
      AUTHENTIK_EMAIL__HOST: ${AUTHENTIK_EMAIL__HOST}
      AUTHENTIK_EMAIL__PORT: ${AUTHENTIK_EMAIL__PORT:-25}
      AUTHENTIK_EMAIL__USERNAME: ${AUTHENTIK_EMAIL__USERNAME}
      AUTHENTIK_EMAIL__PASSWORD: ${AUTHENTIK_EMAIL__PASSWORD}
      AUTHENTIK_EMAIL__USE_TLS: ${AUTHENTIK_EMAIL__USE_TLS:-false}
      AUTHENTIK_EMAIL__USE_SSL: ${AUTHENTIK_EMAIL__USE_SSL:-false}
      AUTHENTIK_EMAIL__TIMEOUT: ${AUTHENTIK_EMAIL__TIMEOUT:-10}
      AUTHENTIK_EMAIL__FROM: ${AUTHENTIK_EMAIL__FROM}
      GEOIPUPDATE_ACCOUNT_ID: ${GEOIPUPDATE_ACCOUNT_ID}
      GEOIPUPDATE_LICENSE_KEY: ${GEOIPUPDATE_LICENSE_KEY}
      AUTHENTIK_AUTHENTIK__GEOIP: ${AUTHENTIK_AUTHENTIK__GEOIP:-/geoip/GeoLite2-City.mmdb}
    volumes:
      - /opt/authentik_data/media:/media
      - /opt/authentik_data/custom-templates:/templates
      - geoip:/geoip
    # env_file:
    #   - .env
    ports:
      - "${AUTHENTIK_PORT_HTTP:-10000}:9000"
      - "${AUTHENTIK_PORT_HTTPS:-10443}:9443"
  worker:
    image: ${AUTHENTIK_IMAGE:-ghcr.io/goauthentik/server}:${AUTHENTIK_TAG:-2022.8.2}
    restart: unless-stopped
    command: worker
    environment:
      AUTHENTIK_REDIS__HOST: redis
      AUTHENTIK_POSTGRESQL__HOST: postgresql
      AUTHENTIK_POSTGRESQL__USER: ${PG_USER:-authentik}
      AUTHENTIK_POSTGRESQL__NAME: ${PG_DB:-authentik}
      AUTHENTIK_POSTGRESQL__PASSWORD: ${PG_PASS}
      AUTHENTIK_ERROR_REPORTING__ENABLED: "true"
      AUTHENTIK_SECRET_KEY: ${AUTHENTIK_SECRET_KEY:?secret key required}
      AUTHENTIK_EMAIL__HOST: ${AUTHENTIK_EMAIL__HOST}
      AUTHENTIK_EMAIL__PORT: ${AUTHENTIK_EMAIL__PORT:-25}
      AUTHENTIK_EMAIL__USERNAME: ${AUTHENTIK_EMAIL__USERNAME}
      AUTHENTIK_EMAIL__PASSWORD: ${AUTHENTIK_EMAIL__PASSWORD}
      AUTHENTIK_EMAIL__USE_TLS: ${AUTHENTIK_EMAIL__USE_TLS:-false}
      AUTHENTIK_EMAIL__USE_SSL: ${AUTHENTIK_EMAIL__USE_SSL:-false}
      AUTHENTIK_EMAIL__TIMEOUT: ${AUTHENTIK_EMAIL__TIMEOUT:-10}
      AUTHENTIK_EMAIL__FROM: ${AUTHENTIK_EMAIL__FROM}
      GEOIPUPDATE_ACCOUNT_ID: ${GEOIPUPDATE_ACCOUNT_ID}
      GEOIPUPDATE_LICENSE_KEY: ${GEOIPUPDATE_LICENSE_KEY}
      AUTHENTIK_AUTHENTIK__GEOIP: ${AUTHENTIK_AUTHENTIK__GEOIP:-/geoip/GeoLite2-City.mmdb}
    # This is optional, and can be removed. If you remove this, the following will happen
    # - The permissions for the /media folders aren't fixed, so make sure they are 1000:1000
    # - The docker socket can't be accessed anymore
    user: root
    volumes:
      - /opt/authentik_data/media:/media
      - /opt/authentik_data/certs:/certs
      - /var/run/docker.sock:/var/run/docker.sock
      - /opt/authentik_data/custom-templates:/templates
      - geoip:/geoip
    # env_file:
    #   - .env
  geoipupdate:
    image: "maxmindinc/geoipupdate:latest"
    volumes:
      - "geoip:/usr/share/GeoIP"
    environment:
      GEOIPUPDATE_EDITION_IDS: "GeoLite2-City"
      GEOIPUPDATE_FREQUENCY: "8"
      GEOIPUPDATE_ACCOUNT_ID: ${GEOIPUPDATE_ACCOUNT_ID}
      GEOIPUPDATE_LICENSE_KEY: ${GEOIPUPDATE_LICENSE_KEY}
      AUTHENTIK_AUTHENTIK__GEOIP: ${AUTHENTIK_AUTHENTIK__GEOIP:-/geoip/GeoLite2-City.mmdb}
    # env_file:
    #   - .env

volumes:
  database:
    driver: local
  redis:
    driver: local
  geoip:
    driver: local

Caddyfile

{$MICROBIN_EXTERNAL_DNS:paste.myapp.local} {

    # always forward outpost path to actual outpost
    reverse_proxy /outpost.goauthentik.io/* {$AUTHENTIK_CONTAINER_NAME:authentik-server-1}:{$AUTHENTIK_PORT:9000}

    # forward authentication to outpost
    forward_auth {$AUTHENTIK_CONTAINER_NAME:authentik-server-1}:{$AUTHENTIK_PORT:9000} {
        uri /outpost.goauthentik.io/auth/caddy

        # capitalization of the headers is important, otherwise they will be empty
        copy_headers X-Authentik-Username X-Authentik-Groups X-Authentik-Email X-Authentik-Name X-Authentik-Uid X-Authentik-Jwt X-Authentik-Meta-Jwks X-Authentik-Meta-Outpost X-Authentik-Meta-Provider X-Authentik-Meta-App X-Authentik-Meta-Version

        # optional, in this config trust all private ranges, should probably be set to the outposts IP
        trusted_proxies private_ranges
    }
    # actual site configuration below, for example

    reverse_proxy {$MICROBIN_CONTAINER_NAME:microbin}:{$MICROBIN_PORT:8080}
}

notes.md

Settings up Microbin behind Authentik

1. Create DNS entry paste.YOUR_DOMAIN.TLD
2. Follow Authentik docker-compose instructions (example docker-compose.yaml in this gist)
   • Create a Forward auth (single application) Provider pointing to https://paste.YOUR_DOMAIN.TLD
   • Create an Application and associate with the Provider you created
   • Add Application to authentik Embedded Outpost
3. Start Caddy container using this Caddyfile with env values set
4. Start Microbin container
5. Visit https://paste.YOUR_DOMAIN.TLD and it should redirect you to Authentik sign in

Note: You'll need to make sure Caddy, Microbin, and authentik-server-1 are all on the same custom network for the Caddyfile to DNS lookup the containers by name.