feat: Authentik Terraform configuration for homelab SSO

Infrastructure as Code for Authentik identity provider managing:

OAuth2/OIDC Applications:
- Grafana, Home Assistant, Immich
- Uptime Kuma (proxy auth)
- Sonarr, Radarr, Prowlarr (*arr stack proxy auth)
- ArgoCD

Identity Sources:
- Google Workspace federation

LDAP:
- TrueNAS LDAP provider and outpost

CI/CD:
- GitHub Actions workflow for plan/apply
- Secrets managed via GitHub Actions secrets

Provider: beryju/authentik v2025.2

.github/workflows/deploy.yml

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+name: Deploy Authentik Configuration
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+env:
+  TF_VERSION: "1.7.0"
+
+jobs:
+  plan:
+    name: Terraform Plan
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_version: ${{ env.TF_VERSION }}
+
+      - name: Create secrets.auto.tfvars
+        run: |
+          cat > secrets.auto.tfvars << EOF
+          authentik_url   = "${{ secrets.AUTHENTIK_URL }}"
+          authentik_token = "${{ secrets.AUTHENTIK_TOKEN }}"
+          
+          # Google OAuth (optional)
+          google_client_id     = "${{ secrets.GOOGLE_CLIENT_ID }}"
+          google_client_secret = "${{ secrets.GOOGLE_CLIENT_SECRET }}"
+          
+          # Application URLs
+          argocd_url        = "${{ secrets.ARGOCD_URL }}"
+          grafana_url       = "${{ secrets.GRAFANA_URL }}"
+          home_assistant_url = "${{ secrets.HOME_ASSISTANT_URL }}"
+          immich_url        = "${{ secrets.IMMICH_URL }}"
+          uptime_kuma_url   = "${{ secrets.UPTIME_KUMA_URL }}"
+          sonarr_url        = "${{ secrets.SONARR_URL }}"
+          radarr_url        = "${{ secrets.RADARR_URL }}"
+          prowlarr_url      = "${{ secrets.PROWLARR_URL }}"
+          EOF
+
+      - name: Terraform Init
+        run: terraform init
+
+      - name: Terraform Validate
+        run: terraform validate
+
+      - name: Terraform Plan
+        run: terraform plan -out=tfplan
+        
+      - name: Upload Plan
+        uses: actions/upload-artifact@v4
+        if: github.event_name == 'pull_request'
+        with:
+          name: tfplan
+          path: tfplan
+
+  apply:
+    name: Terraform Apply
+    runs-on: ubuntu-latest
+    needs: plan
+    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
+    environment: production
+    
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Terraform
+        uses: hashicorp/setup-terraform@v3
+        with:
+          terraform_version: ${{ env.TF_VERSION }}
+
+      - name: Create secrets.auto.tfvars
+        run: |
+          cat > secrets.auto.tfvars << EOF
+          authentik_url   = "${{ secrets.AUTHENTIK_URL }}"
+          authentik_token = "${{ secrets.AUTHENTIK_TOKEN }}"
+          
+          # Google OAuth (optional)
+          google_client_id     = "${{ secrets.GOOGLE_CLIENT_ID }}"
+          google_client_secret = "${{ secrets.GOOGLE_CLIENT_SECRET }}"
+          
+          # Application URLs
+          argocd_url        = "${{ secrets.ARGOCD_URL }}"
+          grafana_url       = "${{ secrets.GRAFANA_URL }}"
+          home_assistant_url = "${{ secrets.HOME_ASSISTANT_URL }}"
+          immich_url        = "${{ secrets.IMMICH_URL }}"
+          uptime_kuma_url   = "${{ secrets.UPTIME_KUMA_URL }}"
+          sonarr_url        = "${{ secrets.SONARR_URL }}"
+          radarr_url        = "${{ secrets.RADARR_URL }}"
+          prowlarr_url      = "${{ secrets.PROWLARR_URL }}"
+          EOF
+
+      - name: Terraform Init
+        run: terraform init
+
+      - name: Terraform Apply
+        run: terraform apply -auto-approve

.gitignore

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+# Terraform
+.terraform/
+.terraform.lock.hcl
+*.tfstate
+*.tfstate.*
+*.tfplan
+crash.log
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+
+# Secrets - NEVER commit these
+*.tfvars
+!*.tfvars.example
+secrets.yaml
+secrets*.yaml
+*.pem
+*.key
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db

README.md

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+# Authentik Terraform Configuration
+
+Infrastructure as Code for Authentik identity provider - manage applications, providers, and SSO via Terraform.
+
+## Features
+
+- **OAuth2/OIDC Applications**: ArgoCD, Grafana
+- **Proxy Authentication**: Home Assistant, Immich, Uptime Kuma, *arr stack
+- **LDAP Outpost**: For legacy application support
+- **Google OAuth Source**: Social login integration
+
+## Quick Start
+
+### 1. Fork/Clone This Repo
+
+```bash
+git clone https://github.com/ghndrx/authentik-terraform.git
+cd authentik-terraform
+```
+
+### 2. Configure GitHub Secrets
+
+Go to **Settings > Secrets and variables > Actions** and add:
+
+| Secret | Description | Example |
+|--------|-------------|---------|
+| `AUTHENTIK_URL` | Your Authentik server URL | `https://auth.example.com` |
+| `AUTHENTIK_TOKEN` | API token from Authentik | `ak-...` |
+| `GOOGLE_CLIENT_ID` | Google OAuth client ID | `xxx.apps.googleusercontent.com` |
+| `GOOGLE_CLIENT_SECRET` | Google OAuth secret | `GOCSPX-...` |
+| `ARGOCD_URL` | ArgoCD URL | `https://argocd.example.com` |
+| `GRAFANA_URL` | Grafana URL | `https://grafana.example.com` |
+| `HOME_ASSISTANT_URL` | Home Assistant URL | `https://home.example.com` |
+| `IMMICH_URL` | Immich URL | `https://photos.example.com` |
+| `UPTIME_KUMA_URL` | Uptime Kuma URL | `https://status.example.com` |
+| `SONARR_URL` | Sonarr URL | `https://sonarr.example.com` |
+| `RADARR_URL` | Radarr URL | `https://radarr.example.com` |
+| `PROWLARR_URL` | Prowlarr URL | `https://prowlarr.example.com` |
+
+### 3. Create Authentik API Token
+
+1. Log into Authentik as admin
+2. Go to **Directory > Tokens and App passwords**
+3. Create a new token with **API Access** intent
+4. Copy the token value
+
+### 4. (Optional) Set Up Google OAuth
+
+1. Go to [Google Cloud Console](https://console.cloud.google.com)
+2. Create OAuth 2.0 credentials
+3. Add authorized redirect URI: `https://auth.example.com/source/oauth/callback/google/`
+
+### 5. Deploy
+
+Push to `main` branch to trigger deployment, or run manually:
+
+```bash
+# Local development
+cp terraform.tfvars.example terraform.tfvars
+# Edit terraform.tfvars with your values
+
+terraform init
+terraform plan
+terraform apply
+```
+
+## GitHub Actions Workflow
+
+- **On PR**: Runs `terraform plan` for review
+- **On Push to main**: Runs `terraform apply` automatically
+- **Manual**: Can trigger via Actions tab
+
+## File Structure
+
+```
+├── .github/workflows/deploy.yml  # CI/CD pipeline
+├── main.tf                       # Authentik provider & brand config
+├── variables.tf                  # All configurable variables
+├── app-*.tf                      # Application configurations
+├── ldap-outpost.tf              # LDAP outpost config
+├── source-google.tf             # Google OAuth source
+└── outputs.tf                   # Useful outputs
+```
+
+## Adding New Applications
+
+### OAuth2/OIDC Application
+
+```hcl
+# app-myapp.tf
+resource "authentik_provider_oauth2" "myapp" {
+  name               = "MyApp"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  client_id          = "myapp"
+  client_type        = "confidential"
+  
+  redirect_uris = [
+    "${var.myapp_url}/oauth/callback"
+  ]
+  
+  property_mappings = data.authentik_property_mapping_provider_scope.oauth2.ids
+}
+
+resource "authentik_application" "myapp" {
+  name              = "MyApp"
+  slug              = "myapp"
+  protocol_provider = authentik_provider_oauth2.myapp.id
+  
+  meta_launch_url = var.myapp_url
+  meta_icon       = "https://example.com/icon.png"
+}
+```
+
+### Proxy Authentication
+
+```hcl
+resource "authentik_provider_proxy" "myapp" {
+  name               = "MyApp Proxy"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  external_host      = var.myapp_url
+  mode               = "forward_single"
+}
+
+resource "authentik_application" "myapp" {
+  name              = "MyApp"
+  slug              = "myapp"
+  protocol_provider = authentik_provider_proxy.myapp.id
+}
+```
+
+## Terraform State
+
+By default, state is stored locally. For production, configure remote backend:
+
+```hcl
+# backend.tf
+terraform {
+  backend "s3" {
+    bucket = "your-terraform-state"
+    key    = "authentik/terraform.tfstate"
+    region = "us-east-1"
+  }
+}
+```
+
+## Security Notes
+
+- Never commit `terraform.tfvars` or any file with secrets
+- Use GitHub Actions secrets for CI/CD
+- API tokens should have minimal required permissions
+- Rotate tokens periodically
+
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | >= 1.5.0 |
+| authentik | >= 2024.0 |
+
+## License
+
+MIT

app-argocd.tf

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+# =============================================================================
+# ArgoCD - GitOps Continuous Delivery
+# =============================================================================
+
+data "authentik_property_mapping_provider_scope" "argocd" {
+  managed_list = [
+    "goauthentik.io/providers/oauth2/scope-openid",
+    "goauthentik.io/providers/oauth2/scope-email",
+    "goauthentik.io/providers/oauth2/scope-profile",
+  ]
+}
+
+resource "authentik_provider_oauth2" "argocd" {
+  name               = "ArgoCD"
+  client_id          = "argocd"
+  client_type        = "confidential"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  
+  access_token_validity  = "hours=1"
+  refresh_token_validity = "days=30"
+  
+  property_mappings = data.authentik_property_mapping_provider_scope.argocd.ids
+  
+  # ArgoCD callback URLs - TODO: Update to your domains
+  allowed_redirect_uris = [
+    { matching_mode = "strict", url = "https://argo.your-tailnet.ts.net/auth/callback" },
+    { matching_mode = "strict", url = "https://argocd.example.com/auth/callback" },
+  ]
+  
+  signing_key = data.authentik_certificate_key_pair.generated.id
+}
+
+resource "authentik_application" "argocd" {
+  name              = "ArgoCD"
+  slug              = "argocd"
+  protocol_provider = authentik_provider_oauth2.argocd.id
+  
+  meta_description = "GitOps Continuous Delivery"
+  meta_launch_url  = "https://argocd.your-tailnet.ts.net"  # TODO: Update
+  
+  group = "DevOps"
+}
+
+output "argocd_client_id" {
+  value = authentik_provider_oauth2.argocd.client_id
+}
+
+output "argocd_client_secret" {
+  value     = authentik_provider_oauth2.argocd.client_secret
+  sensitive = true
+}

app-grafana.tf

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+# =============================================================================
+# Grafana - Monitoring Dashboards
+# =============================================================================
+
+data "authentik_property_mapping_provider_scope" "grafana" {
+  managed_list = [
+    "goauthentik.io/providers/oauth2/scope-openid",
+    "goauthentik.io/providers/oauth2/scope-email",
+    "goauthentik.io/providers/oauth2/scope-profile",
+  ]
+}
+
+resource "authentik_provider_oauth2" "grafana" {
+  name               = "Grafana"
+  client_id          = "grafana"
+  client_type        = "confidential"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  
+  access_token_validity  = "hours=1"
+  refresh_token_validity = "days=30"
+  
+  property_mappings = data.authentik_property_mapping_provider_scope.grafana.ids
+  
+  # TODO: Update to your domains
+  allowed_redirect_uris = [
+    { matching_mode = "strict", url = "https://grafana.your-tailnet.ts.net/login/generic_oauth" },
+    { matching_mode = "strict", url = "https://grafana.example.com/login/generic_oauth" },
+  ]
+  
+  signing_key = data.authentik_certificate_key_pair.generated.id
+}
+
+resource "authentik_application" "grafana" {
+  name              = "Grafana"
+  slug              = "grafana"
+  protocol_provider = authentik_provider_oauth2.grafana.id
+  
+  meta_description = "Monitoring & Observability Dashboards"
+  meta_launch_url  = "https://grafana.your-tailnet.ts.net"  # TODO: Update
+  
+  group = "Monitoring"
+}
+
+output "grafana_client_id" {
+  value = authentik_provider_oauth2.grafana.client_id
+}
+
+output "grafana_client_secret" {
+  value     = authentik_provider_oauth2.grafana.client_secret
+  sensitive = true
+}

app-home-assistant.tf

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+# =============================================================================
+# Home Assistant - Smart Home
+# =============================================================================
+
+data "authentik_property_mapping_provider_scope" "home_assistant" {
+  managed_list = [
+    "goauthentik.io/providers/oauth2/scope-openid",
+    "goauthentik.io/providers/oauth2/scope-email",
+    "goauthentik.io/providers/oauth2/scope-profile",
+  ]
+}
+
+resource "authentik_provider_oauth2" "home_assistant" {
+  name               = "Home Assistant"
+  client_id          = "home-assistant"
+  client_type        = "confidential"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  
+  access_token_validity  = "hours=1"
+  refresh_token_validity = "days=30"
+  
+  property_mappings = data.authentik_property_mapping_provider_scope.home_assistant.ids
+  
+  # TODO: Update to your domain
+  allowed_redirect_uris = [
+    { matching_mode = "strict", url = "https://home.your-tailnet.ts.net/auth/external/callback" },
+  ]
+  
+  signing_key = data.authentik_certificate_key_pair.generated.id
+}
+
+resource "authentik_application" "home_assistant" {
+  name              = "Home Assistant"
+  slug              = "home-assistant"
+  protocol_provider = authentik_provider_oauth2.home_assistant.id
+  
+  meta_description = "Smart Home Control"
+  meta_launch_url  = "https://home.your-tailnet.ts.net"  # TODO: Update
+  
+  group = "Home"
+}
+
+output "home_assistant_client_id" {
+  value = authentik_provider_oauth2.home_assistant.client_id
+}
+
+output "home_assistant_client_secret" {
+  value     = authentik_provider_oauth2.home_assistant.client_secret
+  sensitive = true
+}

app-immich.tf

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+# =============================================================================
+# Immich - Photo Management
+# =============================================================================
+
+data "authentik_property_mapping_provider_scope" "immich" {
+  managed_list = [
+    "goauthentik.io/providers/oauth2/scope-openid",
+    "goauthentik.io/providers/oauth2/scope-email",
+    "goauthentik.io/providers/oauth2/scope-profile",
+  ]
+}
+
+resource "authentik_provider_oauth2" "immich" {
+  name               = "Immich"
+  client_id          = "immich"
+  client_type        = "confidential"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  
+  access_token_validity  = "hours=1"
+  refresh_token_validity = "days=30"
+  
+  property_mappings = data.authentik_property_mapping_provider_scope.immich.ids
+  
+  # TODO: Update to your domain
+  allowed_redirect_uris = [
+    { matching_mode = "strict", url = "https://immich.your-tailnet.ts.net/auth/login" },
+    { matching_mode = "strict", url = "https://immich.your-tailnet.ts.net/user-settings" },
+    { matching_mode = "strict", url = "app.immich:///oauth-callback" },
+  ]
+  
+  signing_key = data.authentik_certificate_key_pair.generated.id
+}
+
+resource "authentik_application" "immich" {
+  name              = "Immich"
+  slug              = "immich"
+  protocol_provider = authentik_provider_oauth2.immich.id
+  
+  meta_description = "Photo & Video Backup"
+  meta_launch_url  = "https://immich.your-tailnet.ts.net"  # TODO: Update
+  
+  group = "Media"
+}
+
+output "immich_client_id" {
+  value = authentik_provider_oauth2.immich.client_id
+}
+
+output "immich_client_secret" {
+  value     = authentik_provider_oauth2.immich.client_secret
+  sensitive = true
+}

app-proxy-arr-stack.tf

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+# =============================================================================
+# Proxy Provider for Arr Stack (Sonarr, Radarr, Prowlarr)
+# These apps don't support OIDC natively, use Authentik proxy auth
+#
+# Note: Each app needs its own provider in Authentik due to 1:1 mapping
+# =============================================================================
+
+# Forward auth provider - Sonarr
+resource "authentik_provider_proxy" "sonarr" {
+  name               = "Sonarr Proxy"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  mode               = "forward_single"
+  external_host      = "https://sonarr.your-tailnet.ts.net"  # TODO: Update
+  access_token_validity = "hours=24"
+}
+
+resource "authentik_application" "sonarr" {
+  name              = "Sonarr"
+  slug              = "sonarr"
+  protocol_provider = authentik_provider_proxy.sonarr.id
+  meta_description  = "TV Show Automation"
+  meta_launch_url   = "https://sonarr.your-tailnet.ts.net"  # TODO: Update
+  group             = "Media"
+}
+
+# Forward auth provider - Radarr
+resource "authentik_provider_proxy" "radarr" {
+  name               = "Radarr Proxy"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  mode               = "forward_single"
+  external_host      = "https://radarr.your-tailnet.ts.net"  # TODO: Update
+  access_token_validity = "hours=24"
+}
+
+resource "authentik_application" "radarr" {
+  name              = "Radarr"
+  slug              = "radarr"
+  protocol_provider = authentik_provider_proxy.radarr.id
+  meta_description  = "Movie Automation"
+  meta_launch_url   = "https://radarr.your-tailnet.ts.net"  # TODO: Update
+  group             = "Media"
+}
+
+# Forward auth provider - Prowlarr
+resource "authentik_provider_proxy" "prowlarr" {
+  name               = "Prowlarr Proxy"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  mode               = "forward_single"
+  external_host      = "https://prowlarr.your-tailnet.ts.net"  # TODO: Update
+  access_token_validity = "hours=24"
+}
+
+resource "authentik_application" "prowlarr" {
+  name              = "Prowlarr"
+  slug              = "prowlarr"
+  protocol_provider = authentik_provider_proxy.prowlarr.id
+  meta_description  = "Indexer Manager"
+  meta_launch_url   = "https://prowlarr.your-tailnet.ts.net"  # TODO: Update
+  group             = "Media"
+}
+
+# Note: To use forward auth with Traefik/nginx, configure the embedded outpost
+# and add middleware to forward auth requests to Authentik

app-uptime-kuma.tf

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+# =============================================================================
+# Uptime Kuma - Status Monitoring
+# Uses proxy authentication (UK doesn't support native OIDC login)
+# =============================================================================
+
+resource "authentik_provider_proxy" "uptime_kuma" {
+  name               = "Uptime Kuma Proxy"
+  authorization_flow = data.authentik_flow.default_authorization.id
+  invalidation_flow  = data.authentik_flow.default_invalidation.id
+  mode               = "forward_single"
+  
+  external_host         = "https://uptime.example.com"  # TODO: Update
+  access_token_validity = "hours=24"
+}
+
+resource "authentik_application" "uptime_kuma" {
+  name              = "Uptime Kuma"
+  slug              = "uptime-kuma"
+  protocol_provider = authentik_provider_proxy.uptime_kuma.id
+  
+  meta_description = "Service Status Monitoring"
+  meta_launch_url  = "https://uptime.example.com"  # TODO: Update
+  
+  group = "Monitoring"
+}
+
+# Note: Configure your reverse proxy (nginx/traefik/cloudflare) 
+# to use Authentik forward auth before proxying to Uptime Kuma
+# 
+# With disableAuth=true in UK, Authentik handles all authentication

ldap-outpost.tf

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+# =============================================================================
+# LDAP Provider and Outpost for TrueNAS
+# Allows LDAP-based authentication against Authentik
+# =============================================================================
+
+# LDAP Provider
+resource "authentik_provider_ldap" "truenas" {
+  name        = "TrueNAS LDAP"
+  base_dn     = "dc=ldap,dc=example,dc=com"  # TODO: Update to your domain
+  bind_flow   = data.authentik_flow.default_authentication.id
+  unbind_flow = data.authentik_flow.default_invalidation.id
+  
+  # Bind mode - direct means users bind with their own credentials
+  bind_mode = "direct"
+  
+  # Search mode
+  search_mode = "direct"
+  
+  # MFA support (optional)
+  mfa_support = false
+}
+
+# Application for LDAP
+resource "authentik_application" "truenas_ldap" {
+  name              = "TrueNAS LDAP"
+  slug              = "truenas-ldap"
+  protocol_provider = authentik_provider_ldap.truenas.id
+  
+  meta_description = "LDAP authentication for TrueNAS"
+  
+  group = "Infrastructure"
+}
+
+# LDAP Outpost (standalone container needed for LDAP)
+resource "authentik_outpost" "ldap" {
+  name               = "LDAP Outpost"
+  type               = "ldap"
+  protocol_providers = [authentik_provider_ldap.truenas.id]
+  
+  config = jsonencode({
+    authentik_host          = "https://authentik.example.com"  # TODO: Update
+    authentik_host_insecure = false
+    log_level               = "info"
+  })
+}
+
+output "ldap_base_dn" {
+  value = "dc=ldap,dc=example,dc=com"  # TODO: Update to match above
+}

main.tf

@@ -0,0 +1,80 @@
+# =============================================================================
+# Authentik Terraform Configuration
+# Update the domain below to match your Authentik instance
+# =============================================================================
+
+# Decrypt secrets with SOPS
+data "sops_file" "secrets" {
+  source_file = "secrets.enc.yaml"
+}
+
+provider "authentik" {
+  url   = var.authentik_url
+  token = data.sops_file.secrets.data["authentik_token"]
+}
+
+# =============================================================================
+# Data Sources - Existing Resources
+# =============================================================================
+
+# Default authentication flow
+data "authentik_flow" "default_authentication" {
+  slug = "default-authentication-flow"
+}
+
+# Default authorization flow (implicit consent)
+data "authentik_flow" "default_authorization" {
+  slug = "default-provider-authorization-implicit-consent"
+}
+
+# Default invalidation flow
+data "authentik_flow" "default_invalidation" {
+  slug = "default-invalidation-flow"
+}
+
+# Default enrollment flow (for social login)
+data "authentik_flow" "default_enrollment" {
+  slug = "default-source-enrollment"
+}
+
+# Get certificate for signing
+data "authentik_certificate_key_pair" "generated" {
+  name = "authentik Self-signed Certificate"
+}
+
+# =============================================================================
+# Brand Configuration
+# =============================================================================
+
+data "authentik_brand" "default" {
+  domain = "authentik-default"
+}
+
+# Update brand with proper domain
+resource "authentik_brand" "main" {
+  domain           = "authentik.example.com"  # TODO: Update to your domain
+  default          = false
+  branding_title   = "My Lab"                 # TODO: Update to your org name
+  branding_logo    = "/static/dist/assets/icons/icon_left_brand.svg"
+  branding_favicon = "/static/dist/assets/icons/icon.png"
+  
+  flow_authentication = data.authentik_flow.default_authentication.id
+  flow_invalidation   = data.authentik_flow.default_invalidation.id
+}
+
+# =============================================================================
+# Groups
+# =============================================================================
+
+resource "authentik_group" "admins" {
+  name         = "Admins"
+  is_superuser = true
+}
+
+resource "authentik_group" "users" {
+  name = "Users"
+}
+
+# =============================================================================
+# Applications are defined in applications/*.tf
+# =============================================================================

outputs.tf

@@ -0,0 +1,14 @@
+output "authentik_url" {
+  description = "Authentik instance URL"
+  value       = var.authentik_url
+}
+
+output "admin_group_id" {
+  description = "Admin group ID for RBAC"
+  value       = authentik_group.admins.id
+}
+
+output "users_group_id" {
+  description = "Users group ID"
+  value       = authentik_group.users.id
+}

source-google.tf

@@ -0,0 +1,31 @@
+# =============================================================================
+# Google Workspace Federation
+# Allow users to sign in with their Google Workspace accounts
+# =============================================================================
+
+# Google OAuth Source
+resource "authentik_source_oauth" "google" {
+  name                = "Google Workspace"
+  slug                = "google"
+  authentication_flow = data.authentik_flow.default_authentication.id
+  enrollment_flow     = data.authentik_flow.default_enrollment.id
+  
+  provider_type   = "google"
+  consumer_key    = data.sops_file.secrets.data["google_client_id"]
+  consumer_secret = data.sops_file.secrets.data["google_client_secret"]
+  
+  # PKCE method - S256 is recommended
+  pkce = "S256"
+  
+  # User matching - link by email
+  user_matching_mode = "email_link"
+  
+  # Policy engine
+  policy_engine_mode = "any"
+  
+  # Enable for login page
+  enabled = true
+}
+
+# Note: After applying, the Google login button will appear on the Authentik login page.
+# Users with matching emails will be linked; new users will be enrolled.

terraform.tfvars.example

@@ -0,0 +1,23 @@
+# Example terraform.tfvars - Copy to terraform.tfvars and fill in your values
+# NEVER commit terraform.tfvars to git!
+
+# Authentik Connection (required)
+authentik_url   = "https://auth.example.com"
+authentik_token = "your-api-token-here"
+
+# Google OAuth (optional - leave empty to skip)
+google_client_id     = ""
+google_client_secret = ""
+
+# Application URLs (set the ones you want to configure)
+argocd_url         = "https://argocd.example.com"
+grafana_url        = "https://grafana.example.com"
+home_assistant_url = "https://home.example.com"
+immich_url         = "https://photos.example.com"
+uptime_kuma_url    = "https://status.example.com"
+sonarr_url         = "https://sonarr.example.com"
+radarr_url         = "https://radarr.example.com"
+prowlarr_url       = "https://prowlarr.example.com"
+
+# LDAP Configuration
+ldap_base_dn = "dc=ldap,dc=example,dc=com"

variables.tf

@@ -0,0 +1,90 @@
+################################################################################
+# Authentik Terraform Variables
+#
+# Set these via:
+# - GitHub Actions secrets (recommended)
+# - terraform.tfvars (local dev only - never commit!)
+# - Environment variables (TF_VAR_*)
+################################################################################
+
+# Authentik Connection
+variable "authentik_url" {
+  type        = string
+  description = "Authentik server URL (e.g., https://auth.example.com)"
+}
+
+variable "authentik_token" {
+  type        = string
+  sensitive   = true
+  description = "Authentik API token"
+}
+
+# Google OAuth (optional)
+variable "google_client_id" {
+  type        = string
+  default     = ""
+  description = "Google OAuth client ID"
+}
+
+variable "google_client_secret" {
+  type        = string
+  sensitive   = true
+  default     = ""
+  description = "Google OAuth client secret"
+}
+
+# Application URLs
+variable "argocd_url" {
+  type        = string
+  default     = ""
+  description = "ArgoCD URL for SSO"
+}
+
+variable "grafana_url" {
+  type        = string
+  default     = ""
+  description = "Grafana URL for SSO"
+}
+
+variable "home_assistant_url" {
+  type        = string
+  default     = ""
+  description = "Home Assistant URL for proxy auth"
+}
+
+variable "immich_url" {
+  type        = string
+  default     = ""
+  description = "Immich URL for proxy auth"
+}
+
+variable "uptime_kuma_url" {
+  type        = string
+  default     = ""
+  description = "Uptime Kuma URL for proxy auth"
+}
+
+variable "sonarr_url" {
+  type        = string
+  default     = ""
+  description = "Sonarr URL for proxy auth"
+}
+
+variable "radarr_url" {
+  type        = string
+  default     = ""
+  description = "Radarr URL for proxy auth"
+}
+
+variable "prowlarr_url" {
+  type        = string
+  default     = ""
+  description = "Prowlarr URL for proxy auth"
+}
+
+# LDAP Configuration
+variable "ldap_base_dn" {
+  type        = string
+  default     = "dc=ldap,dc=example,dc=com"
+  description = "LDAP base DN"
+}

versions.tf

@@ -0,0 +1,14 @@
+terraform {
+  required_version = ">= 1.5.0"
+
+  required_providers {
+    authentik = {
+      source  = "goauthentik/authentik"
+      version = "~> 2025.2"
+    }
+    sops = {
+      source  = "carlpett/sops"
+      version = "~> 1.0"
+    }
+  }
+}