godoauth - Go Docker Token Auth Service

Godoauth is a token authenticator (introduced in Docker Registry v2) which uses Vault as a backend, developed as part of the Docker Global Hack Day #3 in Sydney.

The new token auth allows for fine-grained access control for private registries, especially important in large teams when many different projects share a registry.

Setup

Requirements:

• Vault server
• Docker Private Registry
• Docker 1.6+
• Go 1.4+ (only tested on 1.5.1)

If you haven't setup Go before, you need to first install Go and set a GOPATH (see https://golang.org/doc/code.html#GOPATH).

go get -u -f -t github.com/n1tr0g/...

This will fetch the code and build the command line tools into $GOPATH/bin (assumed to be in your PATH already). To start the Go Docker Authentication Service:

docker run -d -p 5002:5002 --restart=always --name godoauth \
  -v `pwd`/config:/etc/docker/godoauth \
  -v `pwd`/certs/:/certs \
  golja/godoauth

Configuration

Configuration is specified in a YAML file which can be set using the (-config option).

---
version: 0.1
log:
  level: info
  file: /tmp/godoauth.log
storage:
  vault:
    proto: http
    host: 127.0.0.1
    port: 8200
    auth_token: dbXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX
http:
  timeout: 5s
  addr: :5002
  tls:
    certificate: certs/server.pem
    key: certs/server.key
token:
   issuer: Token
   expiration: 800
   certificate: certs/server.pem
   key: certs/server.key

In some instances a configuration option is optional

Version

version: 0.1

The version option is optional. It specifies the configuration's version. It is expected to remain a top-level field, to allow for a consistent version check before parsing the remainder of the configuration file.

log

The log subsection is optional and configures the behavior of the logging system. The logging system outputs everything to stdout. You can adjust the granularity and format with this configuration section.

log:
  level: info
  file: /tmp/godoauth.log

Parameter	Required	Description
level	no	Sets the sensitivity of logging output. Permitted values are error, warn, info and debug. The default is info. TODO
file	no	Sets logging file. TODO

storage

The storage subsection is required and it configures the data backend. Currently only vault is supported, but this may change in the future.

storage:
  vault:
    proto: http
    host: 127.0.0.1
    port: 8200
    auth_token: dbXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX
    timeout: 3s

vault

Parameter	Required	Description
proto	yes	Define vault proto backend. Permitted values are http and https
host	yes	Vault server address
port	yes	Vault server port
auth_token	yes	Vault authentication token used to connect to vault server. Usually generated via vault token-create
timeout	no	timeout for the communicatiob between godoauth and vault server. Default: 3s

http

The http option contains the config for the HTTP(S) server that hosts token authentication.

http:
  addr: :5002
  timeout: 5s
  tls:
    certificate: certs/server.pem
    key: certs/server.key

Parameter	Required	Description
addr	yes	The bind address for the server.
timeout	yes	After how many seconds the connection will be closed.

tls

The tls struct within http is optional and is used setup TLS for the server.

Parameter	Required	Description
certificate	yes	Absolute path to x509 cert file.
key	yes	Absolute path to x509 private key file.

token

The token subsection is required and contains the JWT token specific options.

token:
   issuer: Token
   expiration: 800
   certificate: certs/server.pem
   key: certs/server.key

Parameter	Required	Description
issuer	yes	Issuer of the token. This value must be the same on the registry. Usually you pass it as REGISTRY_AUTH_TOKEN_ISSUER=Issuer
expiration	yes	Token lifetime in in seconds.
certificate	yes	Path to x509 public cert file used for JWT signing.
key	yes	Path to x509 private key file used for JWT signing.

Development

If you want to contribute to godoauth you will need the latest Docker, Vault and a working Go environment.

Create Development SSL Certificates

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout server.key -out server.pem
mkdir certs
cp server.pem server.key certs

NOTE: If you plan to test godoauth on a different host you will need a properly signed SSL or you must add --insecure-registry private.registry.io:5000 to the docker daemon parameters.

Docker Registry v2

On your Docker host start Registry v2

docker run -d -p 5000:5000 --restart=always --name registry \
  -v /root/data:/var/lib/registry \
  -v /root/certs:/certs \
  -e REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/var/lib/registry \
  -e "REGISTRY_AUTH=token" \
  -e REGISTRY_AUTH_TOKEN_REALM=http://localhost:5002/auth \
  -e REGISTRY_AUTH_TOKEN_ISSUER=Token \
  -e "REGISTRY_AUTH_TOKEN_SERVICE=registry" \
  -e REGISTRY_AUTH_TOKEN_ROOTCERTBUNDLE=/certs/server.pem \
  --restart=always \
  registry:2.1.1

Vault

For development purposes you can run Vault locally in development mode. All data will be stored in memory and there is no need to unseal the server.

Install

wget https://dl.bintray.com/mitchellh/vault/vault_VERSION_DISTRO.zip
unzip vault_VERSION_DISTRO.zip
cp vault /usr/local/bin
vault server -devel

Create service mount point

vault mount -path registry generic

The path mount point must match the service name defined in the registry above. The auth service has been designed to support multiple private registries, simply add another mount point in vault with corresponding users.

Add sample users

vault write registry/foo password=bar access="repository:linux/app:*;repository:linux/db:pull"

This will add the user foo with password bar to the registry service with full access to linux/app image and pull permission to linux/db image.

TODO

• Add more testing
• Add support for connection pools
• More different backends

License

This project is distributed under Apache License, Version 2.0.