Azure AD

Available in Zilla Plus

The Azure AD guard in Zilla provides authentication and access control by verifying Access Token. It ensures the integrity of tokens using public keys, allowing only authorized subjects with valid roles to access protected resources.

To prevent unauthorized token reuse, the Azure AD guard enforces constraints on both:

the issuer (who issued the token)
the audience (who the token is intended for)

Additionally, each Access Token has a set expiration time, with an optional challenge window that allows protocol bindings to request token renewal before expiration, ensuring uninterrupted access.

This guard supports both v1.0 and v2.0 Azure AD Access token formats.

Key Discovery & Rotation

The guard uses the issuer value to construct the discovery endpoint URL:

If issuer is omitted, organizations is used as default:

https://login.microsoftonline.com/organizations/v2.0/.well-known/openid-configuration

If issuer is configured(options.issuer), a tenant-specific configuration is used:

https://login.microsoftonline.com/example.onmicrosoft.com/v2.0/.well-known/openid-configuration

From this discovery document, it extracts the jwks_uri to validate tokens.

The Azure AD guard detects public-private key rotations based on max-age, defaulting to a 24 hours refresh interval to ensure uninterrupted token validation.

Usage Example

guards:
  my_azure_ad_guard:
    type: azure-ad
    options:
      audience: 00000000-1111-2222-3333-444444444444

Configuration (* required)

options

object

The azure-ad specific options.

Property	Type	Description
options.issuer	`string`	Default: `organizations`
options.audience	`string`	Audience claim.
options.version	`enum` [ `v1.0`, `v2.0` ]	Default: `v2.0`
options.challenge	`integer`	Challenge period (seconds).

Reference

azure-ad Guard