Censor arguments in stack traces

refs #2810

application/controllers/ErrorController.php

@@ -3,6 +3,7 @@
 
 namespace Icinga\Controllers;
 
+use Icinga\Exception\IcingaException;
 use Zend_Controller_Plugin_ErrorHandler;
 use Icinga\Application\Icinga;
 use Icinga\Application\Logger;
@@ -83,7 +84,7 @@ class ErrorController extends ActionController
                         break;
                     default:
                         $this->getResponse()->setHttpResponseCode(500);
-                        Logger::error("%s\n%s", $exception, $exception->getTraceAsString());
+                        Logger::error("%s\n%s", $exception, IcingaException::getConfidentialTraceAsString($exception));
                         break;
                 }
 
@@ -94,7 +95,7 @@ class ErrorController extends ActionController
 
                     do {
                         $this->view->messages[] = $exception->getMessage();
-                        $this->view->stackTraces[] = $exception->getTraceAsString();
+                        $this->view->stackTraces[] = IcingaException::getConfidentialTraceAsString($exception);
                         $exception = $exception->getPrevious();
                     } while ($exception !== null);
                 } else {

library/Icinga/Exception/IcingaException.php

@@ -60,4 +60,44 @@ class IcingaException extends Exception
             $exception->getMessage()
         );
     }
+
+    /**
+     * Return the same as {@link Exception::getTraceAsString()} for the given exception,
+     * but show only the types of scalar arguments
+     *
+     * @param   Exception   $exception
+     *
+     * @return  string
+     */
+    public static function getConfidentialTraceAsString(Exception $exception)
+    {
+        $trace = array();
+
+        foreach ($exception->getTrace() as $index => $frame) {
+            $trace[] = "#{$index} {$frame['file']}({$frame['line']}): ";
+
+            if (isset($frame['class'])) {
+                $trace[] = $frame['class'];
+            }
+
+            if (isset($frame['type'])) {
+                $trace[] = $frame['type'];
+            }
+
+            $trace[] = "{$frame['function']}(";
+
+            $args = array();
+            foreach ($frame['args'] as $arg) {
+                $type = gettype($arg);
+                $args[] = $type === 'object' ? 'Object(' . get_class($arg) . ')' : ucfirst($type);
+            }
+
+            $trace[] = implode(', ', $args);
+            $trace[] = ")\n";
+        }
+
+        $trace[] = '#' . ($index + 1) . ' {main}';
+
+        return implode($trace);
+    }
 }

modules/doc/library/Doc/Renderer/DocRenderer.php

@@ -4,6 +4,7 @@
 namespace Icinga\Module\Doc\Renderer;
 
 use Exception;
+use Icinga\Exception\IcingaException;
 use RecursiveIteratorIterator;
 use Icinga\Application\Icinga;
 use Icinga\Web\View;
@@ -201,7 +202,7 @@ abstract class DocRenderer extends RecursiveIteratorIterator
         try {
             return $this->render();
         } catch (Exception $e) {
-            return $e->getMessage() . ': ' . $e->getTraceAsString();
+            return $e->getMessage() . ': ' . IcingaException::getConfidentialTraceAsString($e);
         }
     }
 }