External Auth

External Authentication

Coder integrates with Git and OpenID Connect to automate away the need for developers to authenticate with external services within their workspace.

Git Providers

When developers use git inside their workspace, they are prompted to authenticate. After that, Coder will store and refresh tokens for future operations.

Configuration

To add an external authentication provider, you'll need to create an OAuth application. The following providers are supported:

The next step is to configure the Coder server to use the OAuth application by setting the following environment variables:

CODER_EXTERNAL_AUTH_0_ID="<USER_DEFINED_ID>"
CODER_EXTERNAL_AUTH_0_TYPE=<github|gitlab|azure-devops|bitbucket-cloud|bitbucket-server|etc>
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx

# Optionally, configure a custom display name and icon
CODER_EXTERNAL_AUTH_0_DISPLAY_NAME="Google Calendar"
CODER_EXTERNAL_AUTH_0_DISPLAY_ICON="https://mycustomicon.com/google.svg"

The CODER_EXTERNAL_AUTH_0_ID environment variable is used for internal reference. Therefore, it can be set arbitrarily (e.g., primary-github for your GitHub provider).

GitHub

If you don't require fine-grained access control, it's easier to configure a GitHub OAuth app!

Create a GitHub App
- Set the callback URL to https://coder.example.com/external-auth/USER_DEFINED_ID/callback.
- Deactivate Webhooks.
- Enable fine-grained access to specific repositories or a subset of permissions for security.

Adjust the GitHub App permissions. You can use more or less permissions than are listed here, this is merely a suggestion that allows users to clone repositories:

Name	Permission	Description
Contents	Read & Write	Grants access to code and commit statuses.
Pull requests	Read & Write	Grants access to create and update pull requests.
Workflows	Read & Write	Grants access to update files in `.github/workflows/`.
Metadata	Read-only	Grants access to metadata written by GitHub Apps.

Install the App for your organization. You may select a subset of repositories to grant access to.

CODER_EXTERNAL_AUTH_0_ID="USER_DEFINED_ID"
CODER_EXTERNAL_AUTH_0_TYPE=github
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx

GitHub Enterprise

GitHub Enterprise requires the following environment variables:

CODER_EXTERNAL_AUTH_0_ID="primary-github"
CODER_EXTERNAL_AUTH_0_TYPE=github-enterprise
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_0_VALIDATE_URL="https://github.example.com/api/v3/user"
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://github.example.com/login/oauth/authorize"
CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://github.example.com/login/oauth/access_token"

Bitbucket Server

Bitbucket Server requires the following environment variables:

CODER_EXTERNAL_AUTH_0_TYPE="bitbucket-server"
CODER_EXTERNAL_AUTH_0_ID=bitbucket
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxx
CODER_EXTERNAL_AUTH_0_AUTH_URL=https://bitbucket.domain.com/rest/oauth2/latest/authorize

Azure DevOps

Azure DevOps requires the following environment variables:

CODER_EXTERNAL_AUTH_0_ID="primary-azure-devops"
CODER_EXTERNAL_AUTH_0_TYPE=azure-devops
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
# Ensure this value is your "Client Secret", not "App Secret"
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://app.vssps.visualstudio.com/oauth2/authorize"
CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://app.vssps.visualstudio.com/oauth2/token"

Azure DevOps (via Entra ID)

Azure DevOps (via Entra ID) requires the following environment variables:

CODER_EXTERNAL_AUTH_0_ID="primary-azure-devops"
CODER_EXTERNAL_AUTH_0_TYPE=azure-devops-entra
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://login.microsoftonline.com/<TENANT ID>/oauth2/authorize"

Note: Your app registration in Entra ID requires the vso.code_write scope

GitLab self-managed

GitLab self-managed requires the following environment variables:

CODER_EXTERNAL_AUTH_0_ID="primary-gitlab"
CODER_EXTERNAL_AUTH_0_TYPE=gitlab
# This value is the "Application ID"
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_0_VALIDATE_URL="https://gitlab.company.org/oauth/token/info"
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://gitlab.company.org/oauth/authorize"
CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://gitlab.company.org/oauth/token"
CODER_EXTERNAL_AUTH_0_REGEX=gitlab\.company\.org

Gitea

CODER_EXTERNAL_AUTH_0_ID="gitea"
CODER_EXTERNAL_AUTH_0_TYPE=gitea
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
# If self managed, set the Auth URL to your Gitea instance
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://gitea.com/login/oauth/authorize"

Self-managed git providers

Custom authentication and token URLs should be used for self-managed Git provider deployments.

CODER_EXTERNAL_AUTH_0_AUTH_URL="https://github.example.com/oauth/authorize"
CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://github.example.com/oauth/token"
CODER_EXTERNAL_AUTH_0_VALIDATE_URL="https://your-domain.com/oauth/token/info"
CODER_EXTERNAL_AUTH_0_REGEX=github\.company\.org

Note: The REGEX variable must be set if using a custom git domain.

Custom scopes

Optionally, you can request custom scopes:

CODER_EXTERNAL_AUTH_0_SCOPES="repo:read repo:write write:gpg_key"

Multiple External Providers
Enterprise

Multiple providers are an Enterprise feature. Learn more. Below is an example configuration with multiple providers.

# Provider 1) github.com
CODER_EXTERNAL_AUTH_0_ID=primary-github
CODER_EXTERNAL_AUTH_0_TYPE=github
CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_0_REGEX=github.com/orgname

# Provider 2) github.example.com
CODER_EXTERNAL_AUTH_1_ID=secondary-github
CODER_EXTERNAL_AUTH_1_TYPE=github
CODER_EXTERNAL_AUTH_1_CLIENT_ID=xxxxxx
CODER_EXTERNAL_AUTH_1_CLIENT_SECRET=xxxxxxx
CODER_EXTERNAL_AUTH_1_REGEX=github.example.com
CODER_EXTERNAL_AUTH_1_AUTH_URL="https://github.example.com/login/oauth/authorize"
CODER_EXTERNAL_AUTH_1_TOKEN_URL="https://github.example.com/login/oauth/access_token"
CODER_EXTERNAL_AUTH_1_VALIDATE_URL="https://github.example.com/api/v3/user"

To support regex matching for paths (e.g. github.com/orgname), you'll need to add this to the Coder agent startup script:

git config --global credential.useHttpPath true

Kubernetes environment variables

If you deployed Coder with Kubernetes you can set the environment variables in your values.yaml file:

coder:
  env:
    # […]
    - name: CODER_EXTERNAL_AUTH_0_ID
      value: USER_DEFINED_ID

    - name: CODER_EXTERNAL_AUTH_0_TYPE
      value: github

    - name: CODER_EXTERNAL_AUTH_0_CLIENT_ID
      valueFrom:
        secretKeyRef:
          name: github-primary-basic-auth
          key: client-id

    - name: CODER_EXTERNAL_AUTH_0_CLIENT_SECRET
      valueFrom:
        secretKeyRef:
          name: github-primary-basic-auth
          key: client-secret

You can set the secrets by creating a github-primary-basic-auth.yaml file and applying it.

apiVersion: v1
kind: Secret
metadata:
  name: github-primary-basic-auth
type: Opaque
stringData:
  client-secret: xxxxxxxxx
  client-id: xxxxxxxxx

Make sure to restart the affected pods for the change to take effect.

Require git authentication in templates

If your template requires git authentication (e.g. running git clone in the startup_script), you can require users authenticate via git prior to creating a workspace:

Native git authentication will auto-refresh tokens

This is the preferred authentication method.

By default, the coder agent will configure native git authentication via the GIT_ASKPASS environment variable. Meaning, with no additional configuration, external authentication will work with native git commands.

To check the auth token being used from inside a running workspace, run:

# If the exit code is non-zero, then the user is not authenticated with the
# external provider.
coder external-auth access-token <external-auth-id>

Note: Some IDE's override the GIT_ASKPASS environment variable and need to be configured.

VSCode

Use the Coder extension to automatically configure these settings for you!

Otherwise, you can manually configure the following settings:

Set git.terminalAuthentication to false
Set git.useIntegratedAskPass to false

Hard coded tokens do not auto-refresh

If the token is required to be inserted into the workspace, for example GitHub cli, the auth token can be inserted from the template. This token will not auto-refresh. The following example will authenticate via GitHub and auto-clone a repo into the ~/coder directory.

data "coder_external_auth" "github" {
  # Matches the ID of the external auth provider in Coder.
  id = "github"
}

resource "coder_agent" "dev" {
  os   = "linux"
  arch = "amd64"
  dir  = "~/coder"
  env = {
    GITHUB_TOKEN : data.coder_external_auth.github.access_token
  }
  startup_script = <<EOF
if [ ! -d ~/coder ]; then
    git clone https://github.com/coder/coder
fi
EOF
}

See the Terraform provider documentation for all available options.

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