distribution/docs/nginx.md

Authenticating proxy with nginx

## Use-case

People already relying on a nginx proxy to authenticate their users to other services might want to leverage it and have Registry communications tunneled through the same pipeline.

Usually, that includes enterprise setups using LDAP/AD on the backend and a SSO mechanism fronting their internal http portal.

### Alternatives

If you just want authentication for your registry, and are happy maintaining users access separately, you should really consider sticking with the native basic auth registry feature.

### Solution

With the method presented here, you implement basic authentication for docker engines in a reverse proxy that sits in front of your registry.

While we use a simple htpasswd file as an example, any other nginx authentication backend should be fairly easy to implement once you are done with the exemple.

We also implement push restriction (to a limited user group) for the sake of the exemple. Again, you should modify this to fit your mileage.

Gotchas

While this model gives you the ability to use whatever authentication backend you want through the secondary authentication mechanism implemented inside your proxy, it also requires that you move TLS termination from the Registry to the proxy itself.

Furthermore, introducing an extra http layer in your communication pipeline will make it more complex to deploy, maintain, and debug, and will possibly create issues.

Setting things up

Read again the requirements.

Ready?

Run the following:

mkdir -p auth
mkdir -p data

# This is the main nginx configuration you will use
cat <<EOF > auth/nginx.conf
upstream docker-registry {
  server registry:5000;
}

server {
  listen 443 ssl;
  server_name myregistrydomain.com;

  # SSL
  ssl_certificate /etc/nginx/conf.d/domain.crt;
  ssl_certificate_key /etc/nginx/conf.d/domain.key;

  # Recommandations from https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
  ssl_protocols TLSv1.1 TLSv1.2;
  ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
  ssl_prefer_server_ciphers on;
  ssl_session_cache shared:SSL:10m;

  # disable any limits to avoid HTTP 413 for large image uploads
  client_max_body_size 0;

  # required to avoid HTTP 411: see Issue #1486 (https://github.com/docker/docker/issues/1486)
  chunked_transfer_encoding on;

  location /v2/ {
    # Do not allow connections from docker 1.5 and earlier
    # docker pre-1.6.0 did not properly set the user agent on ping, catch "Go *" user agents
    if (\$http_user_agent ~ "^(docker\/1\.(3|4|5(?!\.[0-9]-dev))|Go ).*\$" ) {
      return 404;
    }

    # To add basic authentication to v2 use auth_basic setting plus add_header
    auth_basic "Registry realm";
    auth_basic_user_file /etc/nginx/conf.d/nginx.htpasswd;
    add_header 'Docker-Distribution-Api-Version' 'registry/2.0' always;

    proxy_pass                          http://docker-registry;
    proxy_set_header  Host              \$http_host;   # required for docker client's sake
    proxy_set_header  X-Real-IP         \$remote_addr; # pass on real client's IP
    proxy_set_header  X-Forwarded-For   \$proxy_add_x_forwarded_for;
    proxy_set_header  X-Forwarded-Proto \$scheme;
    proxy_read_timeout                  900;
  }
}
EOF

# Now, create a password file for "testuser" and "testpassword"
docker run --entrypoint htpasswd httpd:2.4 -bn testuser testpassword > auth/nginx.htpasswd

# Copy over your certificate files
cp domain.crt auth
cp domain.key auth

# Now create your compose file

cat <<EOF > docker-compose.yml
nginx:
  image: "nginx:1.9"
  ports:
    - 5043:443
  links:
    - registry:registry
  volumes:
    - `pwd`/auth/:/etc/nginx/conf.d

registry:
  image: registry:2
  ports:
    - 127.0.0.1:5000:5000
  volumes:
    - `pwd`/data:/var/lib/registry
EOF

Starting and stopping

Now, start your stack:

docker-compose up -d

Login with a "push" authorized user (using testuserpush and testpasswordpush), then tag and push your first image:

docker login myregistrydomain.com:5043
docker tag ubuntu myregistrydomain.com:5043/test
docker push myregistrydomain.com:5043/test
docker pull myregistrydomain.com:5043/test

Docker still complains about the certificate?

That's certainly because you are using a self-signed certificate, despite the warnings.

If you really insist on using these, you have to trust it at the OS level.

Usually, on Ubuntu this is done with:

cp auth/domain.crt /usr/local/share/ca-certificates/myregistrydomain.com.crt
update-ca-certificates

... and on RedHat with:

cp auth/domain.crt /etc/pki/ca-trust/source/anchors/myregistrydomain.com.crt
update-ca-trust

Now:

• service docker stop && service docker start (or any other way you use to restart docker)
• docker-compose up -d to bring your registry up