new: Add instance uuid

app/Controller/AppController.php

@@ -101,6 +101,11 @@ class AppController extends Controller {
 			$this->loadModel('Server');
 			$this->Server->serverSettingsSaveValue('Security.salt', $this->User->generateRandomPassword(32));
 		}
+		// Check if the instance has a UUID, if not assign one.
+		if (!Configure::read('MISP.uuid')) {
+			$this->loadModel('Server');
+			$this->Server->serverSettingsSaveValue('MISP.uuid', CakeText::uuid());
+		}
 		// check if Apache provides kerberos authentication data
 		$envvar = Configure::read('ApacheSecureAuth.apacheEnv');
 		if (isset($_SERVER[$envvar])) {

app/Controller/ServersController.php

@@ -1302,4 +1302,8 @@ class ServersController extends AppController {
 			$this->render('ajax/update');
 		}
 	}
+
+	public function getInstanceUUID() {
+		return $this->RestResponse->viewData(array('uuid' => Configure::read('MISP.uuid')), $this->response->type());
+	}
 }

app/Model/Server.php

@@ -268,6 +268,14 @@ class Server extends AppModel {
 							'type' => 'numeric',
 							'optionsSource' => 'LocalOrgs',
 					),
+					'uuid' => array(
+							'level' => 0,
+							'description' => 'The MISP instance UUID. This UUID is used to identify this instance.',
+							'value' => '0',
+							'errorMessage' => 'No valid UUID set',
+							'test' => 'testUuid',
+							'type' => 'string'
+					),
 					'logo' => array(
 							'level' => 3,
 							'description' => 'This setting is deprecated and can be safely removed.',
@@ -2127,6 +2135,13 @@ class Server extends AppModel {
 		return true;
 	}
 
+	public function testUuid($value) {
+		if (empty($value) || !preg_match('/^\{?[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}\}?$/', $value)) {
+			return 'Invalid UUID.';
+		}
+		return true;
+	}
+
 	public function testForSessionDefaults($value) {
 		if (empty($value) || !in_array($value, array('php', 'database', 'cake', 'cache'))) {
 			return 'Please choose a valid session handler. Recommended values: php or database. Alternate options are cake (cakephp file based sessions) and cache.';