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Small proxy for automatically log in users from Cloudflare Access into Grafana

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cloudflare-access-grafana

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cloudflare access grafana logo

cloudflare-access-grafana is an HTTP proxy implemented to run transparently behind Cloudflare Access and forward the email of the signed-in user to Grafana. Running this small proxy between Cloudflare Access and Grafana instance allows you to automatically sign in the authenticated user from Cloudflare Access into Grafana.

πŸ“₯ Installation / Getting started

To accomplish this Grafana has to run in with the Auth Proxy Authentication mode enabled. This will delegate the authentication to another component: Cloudflare Access + cloudflare-access-grafana in this case.

A minimal grafana.ini config could look like this:

[users]
allow_sign_up = false
auto_assign_org = true
auto_assign_org_role = Editor

[auth.proxy]
enabled = true
header_name = X-WEBAUTH-USER
header_property = email
auto_sign_up = true

Running a Grafana docker container with the previous configuration can be done with the following command:

$ docker run --rm --name grafana -i -p 3000:3000 -v $(pwd)/grafana.ini:/etc/grafana/grafana.ini --name grafana grafana/grafana

In this case, the header_property set to email is important because the email is the claim that we get from the JWT token provided by Cloudflare Access. header_name can be configured to any desired value and will need to match the FORWARDHEADER environment variable passed into cloudflare-access-grafana.

You can copy the template from .env.template into your environment file and adjust the required values. Now you can run the cloudflare-access-grafana container with the following command:

$ cp .env.template .env
$ docker run --rm -d --env-file $(pwd)/.env --name cloudflare-proxy -p 3001:3001 jorgelbg/cloudflare-access-grafana

This will start the proxy on the specified address and it will start to listen for incoming requests. When a new HTTP request is received it will validate the JWT token, extract the email claim from the token and forward to the specified host the header with the email address. Grafana will then automatically signup/sign in (depending on the configuration) the user.

Additional configuration on the Cloudflare Access is required to route your subdomain/DNS entry into the cloudflare-access-grafana instance. Grafana doesn't need to be accessible externally since all requests will go through the proxy.

πŸ‘Ύ Known Issues

Since the authentication is no longer on the Grafana side, the logout action will not work as expected. Although it will execute normally, you will find yourself logged in again. This happens because the current user has not been logged out of Cloudflare Access.

πŸ›  Configuration

All the configuration options are passed to cloudflare-access-proxy as environment variables:

  • AUTHDOMAIN: This is your cloudflare authentication domain. Normally in the form of https://<your-own-domain>.cloudflareaccess.com.
  • POLICYAUD: Application Audience (AUD) Tag.
  • FORWARDHEADER: The header to be forwarded to Grafana to indicate which user is currently logged in.
  • FORWARDHOST: URL where the Grafana instance (with auth.proxy enabled) is running.
  • ADDR: Address where the cloudflare-access-proxy will listen for incoming connections.

πŸ‘¨πŸ»β€πŸ’» Developing

git clone https://github.com/jorgelbg/cloudflare-access-grafana
cd cloudflare-access-grafana/
make

This will build a binary placed in bin/github.com/jorgelbg/cloudflare-access-grafana for your native platform.

If you want to build a new Docker image use the following command:

make docker

🀚🏻 Contributing

If you'd like to contribute, please fork the repository and use a feature branch. Pull requests are warmly welcome.

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