headscale/docs/oidc.md

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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:
only_start_if_oidc_is_available: true
issuer: "https://your-oidc.issuer.com/path"
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:
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# client_secret_path: "${CREDENTIALS_DIRECTORY}/oidc_client_secret"
# client_secret and client_secret_path are mutually exclusive.
#
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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"]
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extra_params:
domain_hint: example.com
expiry:
#
# Use the expiry from the token received from OpenID when the user logged
# in, this will typically lead to frequent need to reauthenticate and should
# only been enabled if you know what you are doing.
# Note: enabling this will cause `oidc.expiry.fixed_time` to be ignored.
from_token: false
#
# The amount of time from a node is authenticated with OpenID until it
# expires and needs to reauthenticate.
# Setting the value to "0" will mean no expiry.
fixed_time: 180d
# # 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
groups:
- admins
users:
- admin@example.com
# Map claims from the OIDC token to the user object
claims_map:
name: name
username: email
# username: preferred_username
email: email
groups: groups
# some random configuration
misc:
# if the username is set to `email` then `strip_email_domain` is valid
# If `strip_email_domain` is set to `true`, the domain part of the username email address will be removed.
# This will transform `first-name.last-name@example.com` to the user `first-name.last-name`
# If `strip_email_domain` is set to `false` the domain part will NOT be removed resulting to the following
# user: `first-name.last-name.example.com`
strip_email_domain: true
# If `flatten_groups` is set to `true`, the groups claim will be flattened to a single level.
# this is used for keycloak where the groups are nested. the groups format from keycloak is `group1/subgroup1/subgroup2`
flatten_groups: true
# If `flatten_splitter` is set to a string, the groups claim will be split by the string and flattened to a single level.
flatten_splitter: "/"
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```
## 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
```
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## Google OAuth Example
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In order to integrate Headscale with Google, you'll need to have a [Google Cloud Console](https://console.cloud.google.com) account.
Google OAuth has a [verification process](https://support.google.com/cloud/answer/9110914?hl=en) if you need to have users authenticate who are outside of your domain. If you only need to authenticate users from your domain name (ie `@example.com`), you don't need to go through the verification process.
However if you don't have a domain, or need to add users outside of your domain, you can manually add emails via Google Console.
### Steps
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1. Go to [Google Console](https://console.cloud.google.com) and login or create an account if you don't have one.
2. Create a project (if you don't already have one).
3. On the left hand menu, go to `APIs and services` -> `Credentials`
4. Click `Create Credentials` -> `OAuth client ID`
5. Under `Application Type`, choose `Web Application`
6. For `Name`, enter whatever you like
7. Under `Authorised redirect URIs`, use `https://example.com/oidc/callback`, replacing example.com with your Headscale URL.
8. Click `Save` at the bottom of the form
9. Take note of the `Client ID` and `Client secret`, you can also download it for reference if you need it.
10. Edit your headscale config, under `oidc`, filling in your `client_id` and `client_secret`:
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```yaml
oidc:
issuer: "https://accounts.google.com"
client_id: ""
client_secret: ""
scope: ["openid", "profile", "email"]
```
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You can also use `allowed.domains` and `allowed.users` to restrict the users who can authenticate.