Setting Up Authentication

Dozzle support two configurations for authentication. In the first configuration, you bring your own authentication method by protecting Dozzle through a proxy. Dozzle can read appropriate headers out of the box.

If you do not have an authentication solution then Dozzle has a simple file based user management solution. Authentication providers are setup using --auth-provider flag. In both of these configurations, Dozzle will try to save user settings to disk. This data is written to /data.

File Based User Management

Dozzle supports multi-user authentication by setting --auth-provider to simple. In this mode, Dozzle will try to read /data/users.yml.

The content of the file looks like:

users:
  # "admin" here is username
  admin:
    name: "Admin"
    # Just sha-256 which can be computed with "echo -n password | shasum -a 256"
    password: "5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8"
    email: me@email.net

Dozzle uses email to generate avatars using Gravatar. It is optional.

The password is hashed using sha256 which can be generated with echo -n 'secret-password' | shasum -a 256 or echo -n 'secret-password' | sha256sum on linux.

You will need to mount this file for Dozzle to find it. Here is an example:

cli

$ docker run -v /var/run/docker.sock:/var/run/docker.sock -v /path/to/dozzle/data:/data -p 8080:8080 amir20/dozzle --auth-provider simple

docker-compose.yml

version: "3"
services:
  dozzle:
    image: amir20/dozzle:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /path/to/dozzle/data:/data
    ports:
      - 8080:8080
    environment:
      DOZZLE_AUTH_PROVIDER: simple

users.yml

users:
  # "admin" here is username
  admin:
    name: "Admin"
    # Just sha-256 which can be computed with "echo -n password | shasum -a 256"
    password: "5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8"
    email: me@email.net

Dozzle uses JWT to generate tokens for authentication. This token is saved in a cookie.

Forward Proxy

Dozzle can be configured to read proxy headers by setting --auth-provider to forward-proxy.

cli

$ docker run -v /var/run/docker.sock:/var/run/docker.sock -p 8080:8080 amir20/dozzle --auth-provider forward-proxy

docker-compose.yml

version: "3"
services:
  dozzle:
    image: amir20/dozzle:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    ports:
      - 8080:8080
    environment:
      DOZZLE_AUTH_PROVIDER: forward-proxy

In this mode, Dozzle expects the following headers:

• Remote-User to map to the username eg. johndoe
• Remote-Email to map to the user's email address. This email is also used to find the right Gravatar for the user.
• Remote-Name to be a display name like John Doe

Setting up Dozzle with Authelia

Authelia is an open-source authentication and authorization server and portal fulfilling the identity and access management. While setting up Authelia is out of scope for this section, the configuration can be shared as an example for setting up Dozzle with Authelia.

docker-compose.yml

version: "3.3"

networks:
  net:
    driver: bridge

services:
  authelia:
    image: authelia/authelia
    container_name: authelia
    volumes:
      - ./authelia:/config
    networks:
      - net
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.authelia.rule=Host(`authelia.example.com`)"
      - "traefik.http.routers.authelia.entrypoints=https"
      - "traefik.http.routers.authelia.tls=true"
      - "traefik.http.routers.authelia.tls.options=default"
      - "traefik.http.middlewares.authelia.forwardauth.address=http://authelia:9091/api/verify?rd=https://authelia.example.com"
      - "traefik.http.middlewares.authelia.forwardauth.trustForwardHeader=true"
      - "traefik.http.middlewares.authelia.forwardauth.authResponseHeaders=Remote-User,Remote-Groups,Remote-Name,Remote-Email"
    expose:
      - 9091
    restart: unless-stopped

  traefik:
    image: traefik:2.10.5
    container_name: traefik
    volumes:
      - ./traefik:/etc/traefik
      - /var/run/docker.sock:/var/run/docker.sock
    networks:
      - net
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.api.rule=Host(`traefik.example.com`)"
      - "traefik.http.routers.api.entrypoints=https"
      - "traefik.http.routers.api.service=api@internal"
      - "traefik.http.routers.api.tls=true"
      - "traefik.http.routers.api.tls.options=default"
      - "traefik.http.routers.api.middlewares=authelia@docker"
    ports:
      - "80:80"
      - "443:443"
    command:
      - "--api"
      - "--providers.docker=true"
      - "--providers.docker.exposedByDefault=false"
      - "--providers.file.filename=/etc/traefik/certificates.yml"
      - "--entrypoints.http=true"
      - "--entrypoints.http.address=:80"
      - "--entrypoints.http.http.redirections.entrypoint.to=https"
      - "--entrypoints.http.http.redirections.entrypoint.scheme=https"
      - "--entrypoints.https=true"
      - "--entrypoints.https.address=:443"
      - "--log=true"
      - "--log.level=DEBUG"
  dozzle:
    image: amir20/dozzle:latest
    networks:
      - net
    environment:
      DOZZLE_AUTH_PROVIDER: forward-proxy
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.dozzle.rule=Host(`dozzle.example.com`)"
      - "traefik.http.routers.dozzle.entrypoints=https"
      - "traefik.http.routers.dozzle.tls=true"
      - "traefik.http.routers.dozzle.tls.options=default"
      - "traefik.http.routers.dozzle.middlewares=authelia@docker"
    expose:
      - 8080
    restart: unless-stopped

configuration.yml

###############################################################
#                   Authelia configuration                    #
###############################################################

jwt_secret: a_very_important_secret
default_redirection_url: https://public.example.com

server:
  host: 0.0.0.0
  port: 9091

log:
  level: info

totp:
  issuer: authelia.com

authentication_backend:
  file:
    path: /config/users_database.yml

access_control:
  default_policy: deny
  rules:
    - domain: traefik.example.com
      policy: one_factor
    - domain: dozzle.example.com
      policy: one_factor

session:
  secret: unsecure_session_secret
  domain: example.com # Should match whatever your root protected domain is

regulation:
  max_retries: 3
  find_time: 120
  ban_time: 300

storage:
  encryption_key: you_must_generate_a_random_string_of_more_than_twenty_chars_and_configure_this
  local:
    path: /config/db.sqlite3

notifier:
  filesystem:
    filename: /config/notification.txt

Valid SSL keys are required because Authelia only supports SSL.

Setting up Dozzle with Cloudflare Zero Trust

Cloudflare Zero Trust is a service for authenticated access to selfhosted software. This section defines how Dozzle can be setup to use Cloudflare Zero Trust for authentication.

version: "3.3"

services:
  dozzle:
    image: amir20/dozzle:latest
    networks:
      - net
    environment:
      DOZZLE_AUTH_PROVIDER: forward-proxy
      DOZZLE_AUTH_HEADER_USER: Cf-Access-Authenticated-User-Email
      DOZZLE_AUTH_HEADER_EMAIL: Cf-Access-Authenticated-User-Email
      DOZZLE_AUTH_HEADER_NAME: Cf-Access-Authenticated-User-Email
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    expose:
      - 8080
    restart: unless-stopped

After running the Dozzle container, configure the Application in Cloudflare Zero Trust dashboard by following the guide here.