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External Auth

External Auth

Coder supports external authentication via OAuth2.0. This allows enabling any OAuth provider as well as integrations with Git providers, such as GitHub, GitLab, and Bitbucket.

External authentication can also be used to integrate with external services like JFrog Artifactory and others.

To add an external authentication provider, you'll need to create an OAuth application. The following providers have been tested and work with Coder:

If you have experience with a provider that is not listed here, please file an issue

Configuration

Set environment variables

After you create an OAuth application, set environment variables to configure the Coder server to use it:

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=<OAuth app client ID>
CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=<OAuth app client secret>

# 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 as an identifier for the authentication provider.

This variable is used as part of the callback URL path that you must configure in your OAuth provider settings. If the value in your callback URL doesn't match the CODER_EXTERNAL_AUTH_0_ID value, authentication will fail with redirect URI is not valid. Set it with a value that helps you identify the provider. For example, if you use CODER_EXTERNAL_AUTH_0_ID="primary-github" for your GitHub provider, configure your callback URL as https://example.com/external-auth/primary-github/callback.

Add an authentication button to the workspace template

Add the following code to any template to add a button to the workspace setup page which will allow you to authenticate with your provider:

data "coder_external_auth" "<github|gitlab|azure-devops|bitbucket-cloud|bitbucket-server|other>" {
    id = "<USER_DEFINED_ID>"
}

# GitHub Example (CODER_EXTERNAL_AUTH_0_ID="primary-github")
# makes a GitHub authentication token available at data.coder_external_auth.github.access_token
data "coder_external_auth" "github" {
   id = "primary-github"
}

Inside your Terraform code, you now have access to authentication variables. Reference the documentation for your chosen provider for more information on how to supply it with a token.

Workspace CLI

Use external-auth in the Coder CLI to access a token within the workspace:

coder external-auth access-token <USER_DEFINED_ID>

Git-provider specific env variables

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

Bitbucket Server

Bitbucket Server requires the following environment variables:

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

When configuring your Bitbucket OAuth application, set the redirect URI to https://example.com/external-auth/primary-bitbucket-server/callback. This callback path includes the value of CODER_EXTERNAL_AUTH_0_ID.

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"

The redirect URI for Gitea should be https://coder.example.com/external-auth/gitea/callback.

GitHub

Use this section as a reference for environment variables to customize your setup or to integrate with an existing GitHub authentication.

For a more complete, step-by-step guide, follow the configure a GitHub OAuth app section instead.

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

When configuring your GitHub OAuth application, set the authorization callback URL as https://example.com/external-auth/primary-github/callback, where primary-github matches your CODER_EXTERNAL_AUTH_0_ID value.

GitHub Enterprise

GitHub Enterprise requires the following environment variables:

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_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"

When configuring your GitHub Enterprise OAuth application, set the authorization callback URL as https://example.com/external-auth/primary-github/callback, where primary-github matches your CODER_EXTERNAL_AUTH_0_ID value.

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.example.com/oauth/token/info"
CODER_EXTERNAL_AUTH_0_AUTH_URL="https://gitlab.example.com/oauth/authorize"
CODER_EXTERNAL_AUTH_0_TOKEN_URL="https://gitlab.example.com/oauth/token"
CODER_EXTERNAL_AUTH_0_REGEX=gitlab\.example\.com

When configuring your GitLab OAuth application, set the redirect URI to https://example.com/external-auth/primary-gitlab/callback. Note that the redirect URI must include the value of CODER_EXTERNAL_AUTH_0_ID (in this example, primary-gitlab).

JFrog Artifactory

Visit the JFrog Artifactory guide for instructions on how to set up for JFrog Artifactory.

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://example.com/oauth/token/info"
CODER_EXTERNAL_AUTH_0_REGEX=github\.company\.com

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"

OAuth provider

Configure a GitHub OAuth app

  1. Create a GitHub App

    • Set the authorization callback URL to https://coder.example.com/external-auth/primary-github/callback, where primary-github is the value you set for CODER_EXTERNAL_AUTH_0_ID.
    • Deactivate Webhooks.
    • Enable fine-grained access to specific repositories or a subset of permissions for security.

    Register GitHub App

  2. Adjust the GitHub app permissions. You can use more or fewer permissions than are listed here, this example allows users to clone repositories:

    Adjust GitHub App Permissions

    NamePermissionDescription
    ContentsRead & WriteGrants access to code and commit statuses.
    Pull requestsRead & WriteGrants access to create and update pull requests.
    WorkflowsRead & WriteGrants access to update files in .github/workflows/.
    MetadataRead-onlyGrants access to metadata written by GitHub Apps.
    MembersRead-onlyGrants access to organization members and teams.

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

    Install GitHub App

Multiple External Providers
Premium

Below is an example configuration with multiple providers:

Important

To support regex matching for paths like github\.com/org, add the following git config line to the Coder agent startup script:

git config --global credential.useHttpPath true

# 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/org

# 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"
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