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[phpgitweb.git] / htdocs / lib / Validation.class.php

diff --git a/htdocs/lib/Validation.class.php b/htdocs/lib/Validation.class.php
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+<?php
+/* Validation.class.php - phpgitweb
+ * Copyright (C) 2011-2012  Philipp Kreil (pk910)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License 
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. 
+ */
+
+class Validation {
+       
+       public static function validate_path($path) {
+               /* Path validation #1
+               * no '.' or '..' as elements of path, i.e. no '.' nor '..'
+               * at the beginning, at the end, and between slashes.
+               * also this catches doubled slashes
+               */
+               if(preg_match('#(^|/)(|\.|\.\.)(/|$)#', $path))
+                       return false;
+               
+               /* Path validation #2
+               * no null characters
+               */
+               if(preg_match('#\0#', $path))
+                       return false;
+               
+               return true;
+       }
+       
+       public static function validate_hash($hash) {
+               /* Hash validation #1
+               * regular hashes [a-f0-9] are always ok
+               */
+               if(preg_match('#^[a-f0-9]{1,40}$#i', $hash))
+                       return true;
+               
+               /* Hash validation #2
+               * must be a valid path
+               */
+               if(!self::validate_path($hash))
+                       return false;
+               
+               /* Hash validation #3
+               * restrictions on ref name according to git-check-ref-format
+               */
+               if(preg_match('#(\.|\.\.|[\000-\040\177 ~^:?*\[\]]|/$)#', $hash))
+                       return false;
+               
+               return true;
+       }
+       
+}
+
+?>
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