Viewing file:  sanitizing.lib.php (5.77 KB) -rw-r--r--
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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* This is in a separate script because it's called from a number of scripts
*
* @package PhpMyAdmin
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/**
* Checks whether given link is valid
*
* @param string $url URL to check
* @param boolean $http Whether to allow http links
* @param boolean $other Whether to allow ftp and mailto links
*
* @return boolean True if string can be used as link
*/
function PMA_checkLink($url, $http=false, $other=false)
{
$url = strtolower($url);
$valid_starts = array(
'https://',
'./url.php?url=https%3a%2f%2f',
'./doc/html/',
# possible values from $GLOBALS['cfg']['DefaultTabTable'] and $GLOBALS['cfg']['DefaultTabDatabase']
'./index.php?',
'./server_databases.php?',
'./server_status.php?',
'./server_variables.php?',
'./server_privileges.php?',
'./db_structure.php?',
'./db_sql.php?',
'./db_search.php?',
'./db_operations.php?',
'./tbl_structure.php?',
'./tbl_sql.php?',
'./tbl_select.php?',
'./tbl_change.php?',
'./sql.php?',
# Hardcoded options in libraries/special_schema_links.lib.php
'./db_events.php?',
'./db_routines.php?',
'./server_privileges.php?',
'./tbl_structure.php?',
);
if ($other) {
$valid_starts[] = 'mailto:';
$valid_starts[] = 'ftp://';
}
if ($http) {
$valid_starts[] = 'http://';
}
if (defined('PMA_SETUP')) {
$valid_starts[] = '?page=form&';
$valid_starts[] = '?page=servers&';
}
foreach ($valid_starts as $val) {
if (substr($url, 0, strlen($val)) == $val) {
return true;
}
}
return false;
}
/**
* Callback function for replacing [a@link@target] links in bb code.
*
* @param array $found Array of preg matches
*
* @return string Replaced string
*/
function PMA_replaceBBLink($found)
{
/* Check for valid link */
if (! PMA_checkLink($found[1])) {
return $found[0];
}
/* a-z and _ allowed in target */
if (! empty($found[3]) && preg_match('/[^a-z_]+/i', $found[3])) {
return $found[0];
}
/* Construct target */
$target = '';
if (! empty($found[3])) {
$target = ' target="' . $found[3] . '"';
if ($found[3] == '_blank') {
$target .= ' rel="noopener noreferrer"';
}
}
/* Construct url */
if (substr($found[1], 0, 4) == 'http') {
$url = PMA_linkURL($found[1]);
} else {
$url = $found[1];
}
return '<a href="' . $url . '"' . $target . '>';
}
/**
* Callback function for replacing [doc@anchor] links in bb code.
*
* @param array $found Array of preg matches
*
* @return string Replaced string
*/
function PMA_replaceDocLink($found)
{
$anchor = $found[1];
if (strncmp('faq', $anchor, 3) == 0) {
$page = 'faq';
} else if (strncmp('cfg', $anchor, 3) == 0) {
$page = 'cfg';
} else {
/* Guess */
$page = 'setup';
}
$link = PMA_Util::getDocuLink($page, $anchor);
return '<a href="' . $link . '" target="documentation">';
}
/**
* Sanitizes $message, taking into account our special codes
* for formatting.
*
* If you want to include result in element attribute, you should escape it.
*
* Examples:
*
* <p><?php echo PMA_sanitize($foo); ?></p>
*
* <a title="<?php echo PMA_sanitize($foo, true); ?>">bar</a>
*
* @param string $message the message
* @param boolean $escape whether to escape html in result
* @param boolean $safe whether string is safe (can keep < and > chars)
*
* @return string the sanitized message
*/
function PMA_sanitize($message, $escape = false, $safe = false)
{
if (!$safe) {
$message = strtr($message, array('<' => '<', '>' => '>'));
}
/* Interpret bb code */
$replace_pairs = array(
'[em]' => '<em>',
'[/em]' => '</em>',
'[strong]' => '<strong>',
'[/strong]' => '</strong>',
'[code]' => '<code>',
'[/code]' => '</code>',
'[kbd]' => '<kbd>',
'[/kbd]' => '</kbd>',
'[br]' => '<br />',
'[/a]' => '</a>',
'[/doc]' => '</a>',
'[sup]' => '<sup>',
'[/sup]' => '</sup>',
// used in common.inc.php:
'[conferr]' => '<iframe src="show_config_errors.php" />',
);
$message = strtr($message, $replace_pairs);
/* Match links in bb code ([a@url@target], where @target is options) */
$pattern = '/\[a@([^]"@]*)(@([^]"]*))?\]/';
/* Find and replace all links */
$message = preg_replace_callback($pattern, 'PMA_replaceBBLink', $message);
/* Replace documentation links */
$message = preg_replace_callback(
'/\[doc@([a-zA-Z0-9_-]+)\]/',
'PMA_replaceDocLink',
$message
);
/* Possibly escape result */
if ($escape) {
$message = htmlspecialchars($message);
}
return $message;
}
/**
* Sanitize a filename by removing anything besides legit characters
*
* Intended usecase:
* When using a filename in a Content-Disposition header
* the value should not contain ; or "
*
* When exporting, avoiding generation of an unexpected double-extension file
*
* @param string $filename The filename
* @param boolean $replaceDots Whether to also replace dots
*
* @return string the sanitized filename
*
*/
function PMA_sanitizeFilename($filename, $replaceDots = false)
{
$pattern = '/[^A-Za-z0-9_';
// if we don't have to replace dots
if (! $replaceDots) {
// then add the dot to the list of legit characters
$pattern .= '.';
}
$pattern .= '-]/';
$filename = preg_replace($pattern, '_', $filename);
return $filename;
}
?>
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