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414 lines
12 KiB
414 lines
12 KiB
2 years ago
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<?php
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/**
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* This class includes various sanitization methods that can be called statically
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*/
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declare(strict_types=1);
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namespace PhpMyAdmin;
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use PhpMyAdmin\Html\MySQLDocumentation;
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use function __;
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use function array_keys;
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use function array_merge;
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use function count;
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use function htmlspecialchars;
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use function in_array;
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use function is_array;
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use function is_bool;
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use function is_int;
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use function is_string;
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use function preg_match;
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use function preg_replace;
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use function preg_replace_callback;
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use function str_replace;
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use function str_starts_with;
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use function strlen;
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use function strtolower;
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use function strtr;
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use function substr;
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/**
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* This class includes various sanitization methods that can be called statically
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*/
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class Sanitize
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{
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/**
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* Checks whether given link is valid
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*
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* @param string $url URL to check
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* @param bool $http Whether to allow http links
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* @param bool $other Whether to allow ftp and mailto links
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*/
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public static function checkLink($url, $http = false, $other = false): bool
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{
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$url = strtolower($url);
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$valid_starts = [
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'https://',
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'./url.php?url=https%3a%2f%2f',
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'./doc/html/',
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'./index.php?',
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];
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$is_setup = self::isSetup();
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// Adjust path to setup script location
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if ($is_setup) {
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foreach ($valid_starts as $key => $value) {
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if (substr($value, 0, 2) !== './') {
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continue;
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}
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$valid_starts[$key] = '.' . $value;
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}
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}
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if ($other) {
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$valid_starts[] = 'mailto:';
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$valid_starts[] = 'ftp://';
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}
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if ($http) {
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$valid_starts[] = 'http://';
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}
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if ($is_setup) {
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$valid_starts[] = '?page=form&';
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$valid_starts[] = '?page=servers&';
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}
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foreach ($valid_starts as $val) {
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if (substr($url, 0, strlen($val)) == $val) {
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return true;
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}
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}
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return false;
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}
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/**
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* Check if we are currently on a setup folder page
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*/
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public static function isSetup(): bool
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{
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return $GLOBALS['config'] !== null && $GLOBALS['config']->get('is_setup');
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}
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/**
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* Callback function for replacing [a@link@target] links in bb code.
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*
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* @param array $found Array of preg matches
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*
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* @return string Replaced string
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*/
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public static function replaceBBLink(array $found)
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{
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/* Check for valid link */
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if (! self::checkLink($found[1])) {
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return $found[0];
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}
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/* a-z and _ allowed in target */
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if (! empty($found[3]) && preg_match('/[^a-z_]+/i', $found[3])) {
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return $found[0];
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}
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/* Construct target */
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$target = '';
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if (! empty($found[3])) {
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$target = ' target="' . $found[3] . '"';
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if ($found[3] === '_blank') {
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$target .= ' rel="noopener noreferrer"';
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}
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}
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/* Construct url */
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if (substr($found[1], 0, 4) === 'http') {
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$url = Core::linkURL($found[1]);
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} else {
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$url = $found[1];
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}
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return '<a href="' . $url . '"' . $target . '>';
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}
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/**
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* Callback function for replacing [doc@anchor] links in bb code.
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*
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* @param string[] $found Array of preg matches
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*/
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public static function replaceDocLink(array $found): string
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{
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if (count($found) >= 4) {
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/* doc@page@anchor pattern */
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$page = $found[1];
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$anchor = $found[3];
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} else {
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/* doc@anchor pattern */
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$anchor = $found[1];
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if (str_starts_with($anchor, 'faq')) {
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$page = 'faq';
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} elseif (str_starts_with($anchor, 'cfg')) {
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$page = 'config';
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} else {
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/* Guess */
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$page = 'setup';
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}
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}
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$link = MySQLDocumentation::getDocumentationLink($page, $anchor, self::isSetup() ? '../' : './');
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return '<a href="' . $link . '" target="documentation">';
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}
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/**
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* Sanitizes $message, taking into account our special codes
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* for formatting.
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*
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* If you want to include result in element attribute, you should escape it.
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*
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* Examples:
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*
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* <p><?php echo Sanitize::sanitizeMessage($foo); ?></p>
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*
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* <a title="<?php echo Sanitize::sanitizeMessage($foo, true); ?>">bar</a>
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*
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* @param string $message the message
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* @param bool $escape whether to escape html in result
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* @param bool $safe whether string is safe (can keep < and > chars)
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*/
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public static function sanitizeMessage(string $message, $escape = false, $safe = false): string
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{
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if (! $safe) {
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$message = strtr($message, ['<' => '<', '>' => '>']);
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}
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/* Interpret bb code */
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$replace_pairs = [
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'[em]' => '<em>',
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'[/em]' => '</em>',
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'[strong]' => '<strong>',
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'[/strong]' => '</strong>',
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'[code]' => '<code>',
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'[/code]' => '</code>',
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'[kbd]' => '<kbd>',
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'[/kbd]' => '</kbd>',
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'[br]' => '<br>',
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'[/a]' => '</a>',
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'[/doc]' => '</a>',
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'[sup]' => '<sup>',
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'[/sup]' => '</sup>',
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'[conferr]' => '<iframe src="show_config_errors.php"><a href='
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. '"show_config_errors.php">show_config_errors.php</a></iframe>',
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// used in libraries/Util.php
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'[dochelpicon]' => Html\Generator::getImage('b_help', __('Documentation')),
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];
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$message = strtr($message, $replace_pairs);
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/* Match links in bb code ([a@url@target], where @target is options) */
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$pattern = '/\[a@([^]"@]*)(@([^]"]*))?\]/';
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/* Find and replace all links */
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$message = (string) preg_replace_callback($pattern, static function (array $match) {
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return self::replaceBBLink($match);
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}, $message);
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/* Replace documentation links */
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$message = (string) preg_replace_callback(
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'/\[doc@([a-zA-Z0-9_-]+)(@([a-zA-Z0-9_-]*))?\]/',
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/** @param string[] $match */
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static function (array $match): string {
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return self::replaceDocLink($match);
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},
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$message
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);
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/* Possibly escape result */
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if ($escape) {
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$message = htmlspecialchars($message);
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}
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return $message;
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}
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/**
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* Sanitize a filename by removing anything besides legit characters
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*
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* Intended usecase:
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* When using a filename in a Content-Disposition header
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* the value should not contain ; or "
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*
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* When exporting, avoiding generation of an unexpected double-extension file
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*
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* @param string $filename The filename
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* @param bool $replaceDots Whether to also replace dots
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*
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* @return string the sanitized filename
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*/
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public static function sanitizeFilename($filename, $replaceDots = false)
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{
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$pattern = '/[^A-Za-z0-9_';
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// if we don't have to replace dots
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if (! $replaceDots) {
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// then add the dot to the list of legit characters
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$pattern .= '.';
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}
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$pattern .= '-]/';
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$filename = preg_replace($pattern, '_', $filename);
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return $filename;
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}
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/**
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* Format a string so it can be a string inside JavaScript code inside an
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* eventhandler (onclick, onchange, on..., ).
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* This function is used to displays a javascript confirmation box for
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* "DROP/DELETE/ALTER" queries.
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*
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* @param string $a_string the string to format
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* @param bool $add_backquotes whether to add backquotes to the string or not
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*
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* @return string the formatted string
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*/
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public static function jsFormat($a_string = '', $add_backquotes = true)
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{
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$a_string = htmlspecialchars((string) $a_string);
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$a_string = self::escapeJsString($a_string);
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// Needed for inline javascript to prevent some browsers
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// treating it as a anchor
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$a_string = str_replace('#', '\\#', $a_string);
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return $add_backquotes
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? Util::backquote($a_string)
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: $a_string;
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}
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/**
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* escapes a string to be inserted as string a JavaScript block
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* enclosed by <![CDATA[ ... ]]>
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* this requires only to escape ' with \' and end of script block
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*
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* We also remove NUL byte as some browsers (namely MSIE) ignore it and
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* inserting it anywhere inside </script would allow to bypass this check.
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*
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* @param string $string the string to be escaped
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*
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* @return string the escaped string
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*/
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public static function escapeJsString($string)
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{
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return preg_replace(
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'@</script@i',
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'</\' + \'script',
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strtr(
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(string) $string,
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[
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"\000" => '',
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'\\' => '\\\\',
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'\'' => '\\\'',
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'"' => '\"',
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"\n" => '\n',
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"\r" => '\r',
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]
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)
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);
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}
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/**
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* Formats a value for javascript code.
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*
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* @param string|bool|int $value String to be formatted.
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*
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* @return int|string formatted value.
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*/
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public static function formatJsVal($value)
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{
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if (is_bool($value)) {
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if ($value) {
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return 'true';
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}
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return 'false';
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}
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if (is_int($value)) {
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return $value;
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}
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return '"' . self::escapeJsString($value) . '"';
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}
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/**
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* Formats an javascript assignment with proper escaping of a value
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* and support for assigning array of strings.
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*
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* @param string $key Name of value to set
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* @param mixed $value Value to set, can be either string or array of strings
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* @param bool $escape Whether to escape value or keep it as it is
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* (for inclusion of js code)
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*
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* @return string Javascript code.
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*/
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public static function getJsValue($key, $value, $escape = true)
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{
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$result = $key . ' = ';
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if (! $escape) {
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$result .= $value;
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} elseif (is_array($value)) {
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$result .= '[';
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foreach ($value as $val) {
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$result .= self::formatJsVal($val) . ',';
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}
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$result .= "];\n";
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} else {
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$result .= self::formatJsVal($value) . ";\n";
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}
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return $result;
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}
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/**
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* Removes all variables from request except allowed ones.
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*
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* @param string[] $allowList list of variables to allow
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*/
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public static function removeRequestVars(&$allowList): void
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{
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// do not check only $_REQUEST because it could have been overwritten
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// and use type casting because the variables could have become
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// strings
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$keys = array_keys(
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array_merge((array) $_REQUEST, (array) $_GET, (array) $_POST, (array) $_COOKIE)
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);
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foreach ($keys as $key) {
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if (! in_array($key, $allowList)) {
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unset($_REQUEST[$key], $_GET[$key], $_POST[$key]);
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continue;
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}
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// allowed stuff could be compromised so escape it
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// we require it to be a string
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if (isset($_REQUEST[$key]) && ! is_string($_REQUEST[$key])) {
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||
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unset($_REQUEST[$key]);
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}
|
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if (isset($_POST[$key]) && ! is_string($_POST[$key])) {
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|
|
unset($_POST[$key]);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (isset($_COOKIE[$key]) && ! is_string($_COOKIE[$key])) {
|
||
|
|
unset($_COOKIE[$key]);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (! isset($_GET[$key]) || is_string($_GET[$key])) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
unset($_GET[$key]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|