Add missing option for saml:Action

Author: tvdijen

src/Constants.php

@@ -479,6 +479,11 @@ class Constants extends \SimpleSAML\XMLSecurity\Constants
      */
     public const string ACTION_GHPP = 'urn:oasis:names:tc:SAML:1.0:action:ghpp';
 
+    /**
+     * Unix file permissions
+     */
+    public const string ACTION_UNIX = 'urn:oasis:names:tc:SAML:1.0:action:unix';
+
     /**
      * Sent when the principal wishes to terminate the indicated session
      */

src/XML/saml/Action.php

@@ -59,6 +59,12 @@ public function __construct(
                 array_column(GHPPEnum::cases(), 'value'),
                 ProtocolViolationException::class,
             );
+        } elseif ($namespace->equals(C::ACTION_UNIX)) {
+            Assert::regex(
+                $content->getValue(),
+                '/^[0-7]{4}$/',
+                ProtocolViolationException::class,
+            );
         }
 
         $this->setContent($content);