JwkSetHandler

Expose cryptographic keys as a JWK set. Use this handler to reuse exposed keys for their assigned purpose in a downstream application.

Consider the following limitations:

When the public key isn’t available, the corresponding private key can’t be exposed.

You are not recommended to expose private keys as a JWK.
Keys in secure storage, such as a Hardware Security Module (HSM) or remote server, can’t be exposed.

For a description of how secrets are managed, refer to About secrets.

For information about JWKs and JWK Sets, refer to JSON Web Key (JWK).

Usage

{
  "name": string,
  "type": "JwkSetHandler",
  "config": {
    "secretsProvider": SecretsProvider reference,
    "purposes": [ object, ... ],
    "exposePrivateSecrets": configuration expression<boolean>
  }
}

"secretsProvider": SecretsProvider reference, required: The SecretsProvider to use to resolve the secret. Provide either the name of a SecretsProvider object defined in the heap or specify a SecretsProvider object inline.
"purposes": array of objects, required: One or more purposes for the secret.

{
  "purposes": [
    {
      "secretId": configuration expression<secret-id>,
      "keyUsage": configuration expression<enumeration>
    },
    ...
  ]
}

"secretId": configuration expression<secret-id>, required

The secret ID of the key to be exposed in the JwkSet.

This secret ID must point to a CryptoKey.

"keyUsage": configuration expression<enumeration>, required

The allowed use of the key:

AGREE_KEY: Export the private key used in the key agreement protocol, for example, Diffie-Hellman.
ENCRYPT: Export the public key used to encrypt data.
DECRYPT: Export the private key used to decrypt data.
SIGN: Export the private key used to sign data.
VERIFY: Export the public key used to verify signature data.
WRAP_KEY: Export the public key used to encrypt (wrap) other keys.
UNWRAP_KEY: Export the private key used to decrypt (unwrap) other keys.

exposePrivateSecrets: configuration expression<boolean>, optional

A flag indicating whether to publish private keys in a JWK set. As a security safeguard, this property is false by default to prevent the accidental exposure of private keys.

true: Publish both public and private keys in the JWK set false: Publish only public keys in the JWK set

Default: false

Examples

This example uses a JwkSetHandler to expose a signing key used by the JwtBuilderFilter:

Set an environment variable for the base64-encoded secret to sign the JWT:
```
$ export SIGNING_KEY_SECRET_ID='cGFzc3dvcmQ='
```

Add the following route to IG:

Linux
Windows

$HOME/.openig/config/routes/jwksethandler.json

%appdata%\OpenIG\config\routes\jwksethandler.json

{
  "name": "jwksethandler",
  "condition": "${find(request.uri.path, '/jwksethandler')}",
  "heap": [
    {
      "name": "SecretKeyPropertyFormat-1",
      "type": "SecretKeyPropertyFormat",
      "config": {
        "format": "BASE64",
        "algorithm": "AES"
      }
    },
    {
      "name": "SystemAndEnvSecretStore-1",
      "type": "SystemAndEnvSecretStore",
      "config": {
        "mappings": [{
          "secretId": "signing.key.secret.id",
          "format": "SecretKeyPropertyFormat-1"
        }]
      }
    }
  ],
  "handler": {
    "type": "Chain",
    "config": {
      "filters": [
        {
          "name": "JwtBuilderFilter-1",
          "type": "JwtBuilderFilter",
          "config": {
            "template": {
              "name": "${contexts.userProfile.commonName}",
              "email": "${contexts.userProfile.rawInfo.mail[0]}"
            },
            "secretsProvider": "SystemAndEnvSecretStore-1",
            "signature": {
              "secretId": "signing.key.secret.id",
              "algorithm": "HS256"
            }
          }
        }
      ],
      "handler": {
        "type": "JwkSetHandler",
        "config": {
          "secretsProvider": "SystemAndEnvSecretStore-1",
          "purposes": [{
            "secretId": "signing.key.secret.id",
            "keyUsage": "SIGN"
          }]
        }
      }
    }
  }
}

Notice the following features of the route:

The route matches requests to /jwksethandler.
The JWT signing key is managed by the SysEnvStoreSecretStore in the heap, which refers to the SecretKeyPropertyFormat for the secret’s format.
The JwtBuilderFilter signature property refers to the JWT signing key in the SysEnvStoreSecretStore.
The JwkSetHandler refers to the JWT signing key.

Go to http://ig.example.com:8080/jwksethandler.

The signing key is displayed as an array, as follows:
```
{
  "keys": [
    {
      "k": "cGFzc3dvcmQ",
      "kid": "signing.key.secret.id",
      "kty": "oct",
      "use": "sig"
    }
  ]
}
```
The JWK set secret is ULR base64-encoded. Although the secret is set with the value cGFzc3dvcmQ=, the value cGFzc3dvcmQ is exposed.

More information

org.forgerock.openig.handler.JwkSetHandler

Identity Gateway 2023.11

JwkSetHandler

Usage

Examples

More information