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ArgoCD

Support level: Community

What is ArgoCD​

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes.

-- https://argoproj.github.io/cd/

Preparation​

The following placeholders will be used:

  • argocd.company is the FQDN of the ArgoCD install.
  • authentik.company is the FQDN of the authentik install.
note

Only settings that have been modified from default have been listed.

authentik Configuration​

Step 1 - Provider creation​

In authentik, create an OAuth2/OpenID Provider (under Applications/Providers) with these settings:

  • Name: ArgoCD
  • Client Type: Confidential
  • Signing Key: Select any available key
  • Redirect URIs:
https://argocd.company/api/dex/callback
http://localhost:8085/auth/callback

After creating the provider, take note of the Client ID and Client Secret, you'll need to give them to ArgoCD in the ArgoCD Configuration field.

Step 2 - Application creation​

Create a new Application (under Applications/Applications) with these settings:

Step 3 - ArgoCD Group creation​

Create a new Group (under Directory/Groups) that'll be used as the admin group for ArgoCD (if you already have an "admin" group, you can skip this part!)

  • Name: ArgoCD Admins
  • Members: Add your user and/or any user that should be an ArgoCD admin

You can create another group for read-only access to ArgoCD as well if desired:

  • Name: ArgoCD Viewers
  • Members: Any user that should have ArgoCD read-only access

Terraform provider​

data "authentik_flow" "default-provider-authorization-implicit-consent" {
  slug = "default-provider-authorization-implicit-consent"
}

data "authentik_flow" "default-provider-invalidation" {
  slug = "default-invalidation-flow"
}

data "authentik_property_mapping_provider_scope" "scope-email" {
  name = "authentik default OAuth Mapping: OpenID 'email'"
}

data "authentik_property_mapping_provider_scope" "scope-profile" {
  name = "authentik default OAuth Mapping: OpenID 'profile'"
}

data "authentik_property_mapping_provider_scope" "scope-openid" {
  name = "authentik default OAuth Mapping: OpenID 'openid'"
}

resource "authentik_provider_oauth2" "argocd" {
  name          = "ArgoCD"
  #  Required. You can use the output of:
  #     $ openssl rand -hex 16
  client_id     = "my_client_id"

  # Optional: will be generated if not provided
  # client_secret = "my_client_secret"

  authorization_flow = data.authentik_flow.default-provider-authorization-implicit_consent.id
  invalidation_flow  = data.authentik_flow.default-provider-invalidation.id

  allowed_redirect_uris = [
    {
      matching_mode = "strict",
      url           = "https://argocd.company/api/dex/callback",
    },
    {
      matching_mode = "strict",
      url           = "http://localhost:8085/auth/callback",
    }
  ]

  property_mappings = [
    data.authentik_scope_mapping.scope-email.id,
    data.authentik_scope_mapping.scope-profile.id,
    data.authentik_scope_mapping.scope-openid.id,
  ]
}

resource "authentik_application" "argocd" {
  name              = "ArgoCD"
  slug              = "argocd"
  protocol_provider = authentik_provider_oauth2.argocd.id
}

resource "authentik_group" "argocd_admins" {
  name    = "ArgoCD Admins"
}

resource "authentik_group" "argocd_viewers" {
  name    = "ArgoCD Viewers"
}

ArgoCD Configuration​

note

We're not going to use the oidc config, but instead the "dex", oidc doesn't allow ArgoCD CLI usage while DEX does.

Step 1 - Add the OIDC Secret to ArgoCD​

In the argocd-secret Secret, add the following value to the data field:

dex.authentik.clientSecret: <base 64 encoded value of the Client Secret from the Provider above>

If using Helm, the above can be added to configs.secret.extra in your ArgoCD Helm values.yaml file as shown below, securely substituting the string however you see fit:

configs:
    secret:
        extra:
            dex.authentik.clientSecret: "${argocd_authentik_client_secret}"

Step 2 - Configure ArgoCD to use authentik as OIDC backend​

In the argocd-cm ConfigMap, add the following to the data field :

url: https://argocd.company
dex.config: |
    connectors:
    - config:
        issuer: https://authentik.company/application/o/<application slug defined in step 2>/
        clientID: <client ID from the Provider above>
        clientSecret: $dex.authentik.clientSecret
        insecureEnableGroups: true
        scopes:
          - openid
          - profile
          - email
      name: authentik
      type: oidc
      id: authentik

Step 3 - Map the ArgoCD Admins group to ArgoCD's admin role​

In the argocd-rbac-cm ConfigMap, add the following to the data field (or create it if it's not already there) :

policy.csv: |
    g, ArgoCD Admins, role:admin
    g, ArgoCD Viewers, role:readonly

If you already had an "admin" group and thus didn't create the ArgoCD Admins one, just replace ArgoCD Admins with your existing group name. If you did not opt to create a read-only group, or chose to use one with a different name in authentik, rename or remove here accordingly.

Apply all the modified manifests, and you should be able to login to ArgoCD both through the UI and the CLI.