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# Configuring Headscale to use OIDC authentication
In order to authenticate users through a centralized solution one must enable the OIDC integration.
Known limitations:
- No dynamic ACL support
- OIDC groups cannot be used in ACLs
## Basic configuration
In your `config.yaml` , customize this to your liking:
```yaml
oidc:
# Block further startup until the OIDC provider is healthy and available
only_start_if_oidc_is_available: true
# Specified by your OIDC provider
issuer: "https://your-oidc.issuer.com/path"
# Specified/generated by your OIDC provider
client_id: "your-oidc-client-id"
client_secret: "your-oidc-client-secret"
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# alternatively, set `client_secret_path` to read the secret from the file.
# It resolves environment variables, making integration to systemd's
# `LoadCredential` straightforward:
#client_secret_path: "${CREDENTIALS_DIRECTORY}/oidc_client_secret"
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# Customize the scopes used in the OIDC flow, defaults to "openid", "profile" and "email" and add custom query
# parameters to the Authorize Endpoint request. Scopes default to "openid", "profile" and "email".
scope: ["openid", "profile", "email", "custom"]
# Optional: Passed on to the browser login request – used to tweak behaviour for the OIDC provider
extra_params:
domain_hint: example.com
# Optional: List allowed principal domains and/or users. If an authenticated user's domain is not in this list,
# the authentication request will be rejected.
allowed_domains:
- example.com
# Optional. Note that groups from Keycloak have a leading '/'.
allowed_groups:
- /headscale
# Optional.
allowed_users:
- alice@example.com
# If `strip_email_domain` is set to `true` , the domain part of the username email address will be removed.
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# This will transform `first-name.last-name@example.com` to the user `first-name.last-name`
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# If `strip_email_domain` is set to `false` the domain part will NOT be removed resulting to the following
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# user: `first-name.last-name.example.com`
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strip_email_domain: true
```
## Azure AD example
In order to integrate Headscale with Azure Active Directory, we'll need to provision an App Registration with the correct scopes and redirect URI. Here with Terraform:
```hcl
resource "azuread_application" "headscale" {
display_name = "Headscale"
sign_in_audience = "AzureADMyOrg"
fallback_public_client_enabled = false
required_resource_access {
// Microsoft Graph
resource_app_id = "00000003-0000-0000-c000-000000000000"
resource_access {
// scope: profile
id = "14dad69e-099b-42c9-810b-d002981feec1"
type = "Scope"
}
resource_access {
// scope: openid
id = "37f7f235-527c-4136-accd-4a02d197296e"
type = "Scope"
}
resource_access {
// scope: email
id = "64a6cdd6-aab1-4aaf-94b8-3cc8405e90d0"
type = "Scope"
}
}
web {
# Points at your running Headscale instance
redirect_uris = ["https://headscale.example.com/oidc/callback"]
implicit_grant {
access_token_issuance_enabled = false
id_token_issuance_enabled = true
}
}
group_membership_claims = ["SecurityGroup"]
optional_claims {
# Expose group memberships
id_token {
name = "groups"
}
}
}
resource "azuread_application_password" "headscale-application-secret" {
display_name = "Headscale Server"
application_object_id = azuread_application.headscale.object_id
}
resource "azuread_service_principal" "headscale" {
application_id = azuread_application.headscale.application_id
}
resource "azuread_service_principal_password" "headscale" {
service_principal_id = azuread_service_principal.headscale.id
end_date_relative = "44640h"
}
output "headscale_client_id" {
value = azuread_application.headscale.application_id
}
output "headscale_client_secret" {
value = azuread_application_password.headscale-application-secret.value
}
```
And in your Headscale `config.yaml` :
```yaml
oidc:
issuer: "https://login.microsoftonline.com/< tenant-UUID > /v2.0"
client_id: "< client-id-from-terraform > "
client_secret: "< client-secret-from-terraform > "
# Optional: add "groups"
scope: ["openid", "profile", "email"]
extra_params:
# Use your own domain, associated with Azure AD
domain_hint: example.com
# Optional: Force the Azure AD account picker
prompt: select_account
```