minor #20637 [Security] Add support for encrypted access tokens (JWE) in OIDC (Spomky)

This PR was merged into the 7.3 branch.

Discussion
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[Security] Add support for encrypted access tokens (JWE) in OIDC

Fixes  #20577

This update introduces support for decrypting encrypted access tokens (JWE) in Symfony 7.3. It includes configuration options for enabling encryption, enforcing it, specifying decryption algorithms, and providing decryption keysets. The feature extends flexibility in handling secure tokens alongside existing signing mechanisms.

**⚠ Warning**: I am not sure the XML and PHP examples are correct.

Commits
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8b403f7 Add support for encrypted access tokens (JWE) in OIDC

Author: javiereguiluz

security/access_token.rst

@@ -615,8 +615,8 @@ If you haven't installed it yet, run this command:
 
     $ composer require web-token/jwt-library
 
-Symfony provides a generic ``OidcTokenHandler`` to decode your token, validate
-it and retrieve the user info from it:
+Symfony provides a generic ``OidcTokenHandler`` that decodes the token, validates
+it, and retrieves the user information from it. Optionally, the token can be encrypted (JWE):
 
 .. configuration-block::
 
@@ -637,6 +637,11 @@ it and retrieve the user info from it:
                                 audience: 'api-example'
                                 # Issuers (`iss` claim): required for validation purpose
                                 issuers: ['https://oidc.example.com']
+                                encryption:
+                                    enabled: true # Default to false
+                                    enforce: false # Default to false, requires an encrypted token when true
+                                    algorithms: ['ECDH-ES', 'A128GCM']
+                                    keyset: '{"keys": [...]}' # Encryption private keyset
 
     .. code-block:: xml
 
@@ -662,6 +667,10 @@ it and retrieve the user info from it:
                                 <algorithm>ES256</algorithm>
                                 <algorithm>RS256</algorithm>
                                 <issuer>https://oidc.example.com</issuer>
+                                <encryption enabled="true" enforce="true" keyset="{'keys': [...]}">
+                                    <algorithm>ECDH-ES</algorithm>
+                                    <algorithm>A128GCM</algorithm>
+                                </encryption>
                             </oidc>
                         </token-handler>
                     </access-token>
@@ -681,12 +690,20 @@ it and retrieve the user info from it:
                         ->oidc()
                             // Algorithm used to sign the JWS
                             ->algorithms(['ES256', 'RS256'])
-                            // A JSON-encoded JWK
+                            // A JSON-encoded JWKSet (public keys)
                             ->keyset('{"keys":[{"kty":"...","k":"..."}]}')
                             // Audience (`aud` claim): required for validation purpose
                             ->audience('api-example')
                             // Issuers (`iss` claim): required for validation purpose
                             ->issuers(['https://oidc.example.com'])
+                            ->encryption()
+                                ->enabled(true) //Default to false
+                                ->enforce(false) //Default to false, requires an encrypted token when true
+                                // Algorithm used to decrypt the JWE
+                                ->algorithms(['ECDH-ES', 'A128GCM'])
+                                // A JSON-encoded JWKSet (private keys)
+                                ->keyset('{"keys":[...]}')
+
             ;
         };
 
@@ -695,6 +712,10 @@ it and retrieve the user info from it:
     The support of multiple algorithms to sign the JWS was introduced in Symfony 7.1.
     In previous versions, only the ``ES256`` algorithm was supported.
 
+.. versionadded:: 7.3
+
+    Support for encryption algorithms to decrypt JWEs was introduced in Symfony 7.3.
+
 To enable `OpenID Connect Discovery`_, the ``OidcTokenHandler`` requires the
 ``symfony/cache`` package to store the OIDC configuration in the cache. If you
 haven't installed it yet, run the following command: