Features/Single Sign On

SSO Configuration

Overview

There are two ways that SSO can be configured:

  • Bundled Dex OIDC provider - use this option your current provider does not support OIDC (e.g. SAML, LDAP) or if you wish to leverage any of Dex's connector features (e.g. the ability to map GitHub organizations and teams to OIDC groups claims).

  • Existing OIDC provider - use this if you already have an OIDC provider which you are using (e.g. Okta, OneLogin, Auth0, Microsoft), where you manage your users, groups, and memberships.

Dex

Argo CD embeds and bundles Dex as part of its installation, for the purpose of delegating authentication to an external identity provider. Multiple types of identity providers are supported (OIDC, SAML, LDAP, GitHub, etc...). SSO configuration of Argo CD requires editing the argocd-cm ConfigMap with Dex connector settings.

This document describes how to configure Argo CD SSO using GitHub (OAuth2) as an example, but the steps should be similar for other identity providers.

1. Register the application in the identity provider

In GitHub, register a new application. The callback address should be the /api/dex/callback endpoint of your Argo CD URL (e.g. https://argocd.example.com/api/dex/callback).

Register OAuth App

After registering the app, you will receive an OAuth2 client ID and secret. These values will be inputted into the Argo CD configmap.

OAuth2 Client Config

2. Configure Argo CD for SSO

Edit the argocd-cm configmap:

kubectl edit configmap argocd-cm
  • In the url key, input the base URL of Argo CD. In this example, it is https://argocd.example.com
  • In the dex.config key, add the github connector to the connectors sub field. See Dex's GitHub connector documentation for explanation of the fields. A minimal config should populate the clientID, clientSecret generated in Step 1.
  • You will very likely want to restrict logins to one or more GitHub organization. In the connectors.config.orgs list, add one or more GitHub organizations. Any member of the org will then be able to login to Argo CD to perform management tasks.
data:
  url: https://argocd.example.com

  dex.config: |
    connectors:
      # GitHub example
      - type: github
        id: github
        name: GitHub
        config:
          clientID: aabbccddeeff00112233
          clientSecret: $dex.github.clientSecret
          orgs:
          - name: your-github-org

      # GitHub enterprise example
      - type: github
        id: acme-github
        name: Acme GitHub
        config:
          hostName: github.acme.com
          clientID: abcdefghijklmnopqrst
          clientSecret: $dex.acme.clientSecret
          orgs:
          - name: your-github-org

After saving, the changes should take affect automatically.

NOTES:

  • Any values which start with '$' will look to a key in argocd-secret of the same name (minus the $), to obtain the actual value. This allows you to store the clientSecret as a kubernetes secret.
  • There is no need to set redirectURI in the connectors.config as shown in the dex documentation. Argo CD will automatically use the correct redirectURI for any OAuth2 connectors, to match the correct external callback URL (e.g. https://argocd.example.com/api/dex/callback)

Existing OIDC provider

To configure Argo CD to delegate authenticate to your existing OIDC provider, add the OAuth2 configuration to the argocd-cm ConfigMap under the oidc.config key:

data:
  url: https://argocd.example.com

  oidc.config: |
    name: Okta
    issuer: https://dev-123456.oktapreview.com
    clientID: aaaabbbbccccddddeee
    clientSecret: $oidc.okta.clientSecret