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remove one problematic instance from the realpath replacement
git-svn-id: file:///svn/phpbb/trunk@8129 89ea8834-ac86-4346-8a33-228a782c2dd0
This commit is contained in:
Meik Sievertsen
parent
eca02ecbf3
commit
303239afa4
1 changed files with 167 additions and 177 deletions
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@ -8,6 +8,14 @@
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*
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*/
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/**
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* @ignore
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*/
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if (!defined('IN_PHPBB'))
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{
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exit;
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}
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// Common global functions
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/**
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@ -472,184 +480,166 @@ if (!function_exists('stripos'))
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if (!function_exists('realpath'))
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{
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if (DIRECTORY_SEPARATOR != '\\' && !(bool) ini_get('safe_mode') && function_exists('shell_exec') && trim(`realpath .`))
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/**
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* Checks if a path ($path) is absolute or relative
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*
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* @param string $path Path to check absoluteness of
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* @return boolean
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*/
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function is_absolute($path)
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{
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/**
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* @author Chris Smith <chris@project-minerva.org>
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* @copyright 2006 Project Minerva Team
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* @param string $path The path which we should attempt to resolve.
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* @return mixed
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* @ignore
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*/
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function phpbb_realpath($path)
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{
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$arg = escapeshellarg($path);
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return trim(`realpath '$arg'`);
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}
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return ($path[0] == '/' || (DIRECTORY_SEPARATOR == '\\' && preg_match('#^[a-z]:/#i', $path))) ? true : false;
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}
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else
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/**
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* @author Chris Smith <chris@project-minerva.org>
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* @copyright 2006 Project Minerva Team
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* @param string $path The path which we should attempt to resolve.
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* @return mixed
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*/
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function phpbb_realpath($path)
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{
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/**
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* Checks if a path ($path) is absolute or relative
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*
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* @param string $path Path to check absoluteness of
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* @return boolean
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*/
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function is_absolute($path)
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// Now to perform funky shizzle
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// Switch to use UNIX slashes
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$path = str_replace(DIRECTORY_SEPARATOR, '/', $path);
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$path_prefix = '';
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// Determine what sort of path we have
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if (is_absolute($path))
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{
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return ($path[0] == '/' || (DIRECTORY_SEPARATOR == '\\' && preg_match('#^[a-z]:/#i', $path))) ? true : false;
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}
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$absolute = true;
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/**
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* @author Chris Smith <chris@project-minerva.org>
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* @copyright 2006 Project Minerva Team
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* @param string $path The path which we should attempt to resolve.
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* @return mixed
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*/
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function phpbb_realpath($path)
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{
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// Now to perform funky shizzle
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// Switch to use UNIX slashes
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$path = str_replace(DIRECTORY_SEPARATOR, '/', $path);
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$path_prefix = '';
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// Determine what sort of path we have
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if (is_absolute($path))
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if ($path[0] == '/')
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{
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// Absolute path, *NIX style
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$path_prefix = '';
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}
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else
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{
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// Absolute path, Windows style
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// Remove the drive letter and colon
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$path_prefix = $path[0] . ':';
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$path = substr($path, 2);
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}
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}
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else
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{
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// Relative Path
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// Prepend the current working directory
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if (function_exists('getcwd'))
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{
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// This is the best method, hopefully it is enabled!
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$path = str_replace(DIRECTORY_SEPARATOR, '/', getcwd()) . '/' . $path;
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$absolute = true;
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if ($path[0] == '/')
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if (preg_match('#^[a-z]:#i', $path))
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{
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// Absolute path, *NIX style
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$path_prefix = '';
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$path_prefix = $path[0] . ':';
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$path = substr($path, 2);
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}
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else
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{
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// Absolute path, Windows style
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// Remove the drive letter and colon
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$path_prefix = $path[0] . ':';
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$path = substr($path, 2);
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$path_prefix = '';
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}
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}
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else if (isset($_SERVER['SCRIPT_FILENAME']) && !empty($_SERVER['SCRIPT_FILENAME']))
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{
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// Warning: If chdir() has been used this will lie!
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// Warning: This has some problems sometime (CLI can create them easily)
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$path = str_replace(DIRECTORY_SEPARATOR, '/', dirname($_SERVER['SCRIPT_FILENAME'])) . '/' . $path;
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$absolute = true;
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$path_prefix = '';
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}
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else
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{
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// We have no way of getting the absolute path, just run on using relative ones.
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$absolute = false;
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$path_prefix = '.';
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}
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}
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// Remove any repeated slashes
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$path = preg_replace('#/{2,}#', '/', $path);
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// Remove the slashes from the start and end of the path
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$path = trim($path, '/');
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// Break the string into little bits for us to nibble on
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$bits = explode('/', $path);
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// Remove any . in the path, renumber array for the loop below
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$bits = array_values(array_diff($bits, array('.')));
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// Lets get looping, run over and resolve any .. (up directory)
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for ($i = 0, $max = sizeof($bits); $i < $max; $i++)
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{
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// @todo Optimise
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if ($bits[$i] == '..' )
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{
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if (isset($bits[$i - 1]))
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{
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if ($bits[$i - 1] != '..')
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{
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// We found a .. and we are able to traverse upwards, lets do it!
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unset($bits[$i]);
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unset($bits[$i - 1]);
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$i -= 2;
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$max -= 2;
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$bits = array_values($bits);
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}
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}
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else if ($absolute) // ie. !isset($bits[$i - 1]) && $absolute
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{
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// We have an absolute path trying to descend above the root of the filesystem
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// ... Error!
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return false;
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}
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}
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}
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// Prepend the path prefix
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array_unshift($bits, $path_prefix);
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$resolved = '';
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$max = sizeof($bits) - 1;
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// Check if we are able to resolve symlinks, Windows cannot.
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$symlink_resolve = (function_exists('readlink')) ? true : false;
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foreach ($bits as $i => $bit)
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{
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if (@is_dir("$resolved/$bit") || ($i == $max && @is_file("$resolved/$bit")))
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{
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// Path Exists
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if ($symlink_resolve && is_link("$resolved/$bit") && ($link = readlink("$resolved/$bit")))
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{
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// Resolved a symlink.
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$resolved = $link . (($i == $max) ? '' : '/');
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continue;
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}
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}
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else
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{
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// Relative Path
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// Prepend the current working directory
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if (function_exists('getcwd'))
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{
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// This is the best method, hopefully it is enabled!
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$path = str_replace(DIRECTORY_SEPARATOR, '/', getcwd()) . '/' . $path;
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$absolute = true;
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if (preg_match('#^[a-z]:#i', $path))
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{
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$path_prefix = $path[0] . ':';
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$path = substr($path, 2);
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}
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else
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{
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$path_prefix = '';
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}
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}
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else if (isset($_SERVER['SCRIPT_FILENAME']) && !empty($_SERVER['SCRIPT_FILENAME']))
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{
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// Warning: If chdir() has been used this will lie!
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// Warning: This has some problems sometime (CLI can create them easily)
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$path = str_replace(DIRECTORY_SEPARATOR, '/', dirname($_SERVER['SCRIPT_FILENAME'])) . '/' . $path;
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$absolute = true;
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$path_prefix = '';
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}
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else
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{
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// We have no way of getting the absolute path, just run on using relative ones.
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$absolute = false;
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$path_prefix = '.';
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}
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// Something doesn't exist here!
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// This is correct realpath() behaviour but sadly open_basedir and safe_mode make this problematic
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// return false;
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}
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// Remove any repeated slashes
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$path = preg_replace('#/{2,}#', '/', $path);
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// Remove the slashes from the start and end of the path
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$path = trim($path, '/');
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// Break the string into little bits for us to nibble on
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$bits = explode('/', $path);
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// Remove any . in the path, renumber array for the loop below
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$bits = array_values(array_diff($bits, array('.')));
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// Lets get looping, run over and resolve any .. (up directory)
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for ($i = 0, $max = sizeof($bits); $i < $max; $i++)
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{
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// @todo Optimise
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if ($bits[$i] == '..' )
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{
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if (isset($bits[$i - 1]))
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{
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if ($bits[$i - 1] != '..')
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{
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// We found a .. and we are able to traverse upwards, lets do it!
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unset($bits[$i]);
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unset($bits[$i - 1]);
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$i -= 2;
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$max -= 2;
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$bits = array_values($bits);
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}
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}
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else if ($absolute) // ie. !isset($bits[$i - 1]) && $absolute
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{
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// We have an absolute path trying to descend above the root of the filesystem
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// ... Error!
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return false;
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}
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}
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}
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// Prepend the path prefix
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array_unshift($bits, $path_prefix);
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$resolved = '';
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$max = sizeof($bits) - 1;
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// Check if we are able to resolve symlinks, Windows cannot.
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$symlink_resolve = (function_exists('readlink')) ? true : false;
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foreach ($bits as $i => $bit)
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{
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if (@is_dir("$resolved/$bit") || ($i == $max && @is_file("$resolved/$bit")))
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{
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// Path Exists
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if ($symlink_resolve && is_link("$resolved/$bit") && ($link = readlink("$resolved/$bit")))
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{
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// Resolved a symlink.
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$resolved = $link . (($i == $max) ? '' : '/');
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continue;
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}
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}
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else
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{
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// Something doesn't exist here!
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// This is correct realpath() behaviour but sadly open_basedir and safe_mode make this problematic
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// return false;
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}
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$resolved .= $bit . (($i == $max) ? '' : '/');
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}
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// @todo If the file exists fine and open_basedir only has one path we should be able to prepend it
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// because we must be inside that basedir, the question is where...
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// @internal The slash in is_dir() gets around an open_basedir restriction
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if (!@file_exists($resolved) || (!is_dir($resolved . '/') && !is_file($resolved)))
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{
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return false;
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}
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// Put the slashes back to the native operating systems slashes
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$resolved = str_replace('/', DIRECTORY_SEPARATOR, $resolved);
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return $resolved; // We got here, in the end!
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$resolved .= $bit . (($i == $max) ? '' : '/');
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}
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// @todo If the file exists fine and open_basedir only has one path we should be able to prepend it
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// because we must be inside that basedir, the question is where...
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// @internal The slash in is_dir() gets around an open_basedir restriction
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if (!@file_exists($resolved) || (!is_dir($resolved . '/') && !is_file($resolved)))
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{
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return false;
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}
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// Put the slashes back to the native operating systems slashes
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$resolved = str_replace('/', DIRECTORY_SEPARATOR, $resolved);
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return $resolved; // We got here, in the end!
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}
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}
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else
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