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| <?php
declare(strict_types=1);
namespace app\api\service;
use think\facade\Log;
class XssProtectionService
{
private array $dangerousTags = [
'script', 'iframe', 'object', 'embed', 'form', 'input',
'textarea', 'button', 'select', 'option', 'link', 'style'
];
private array $dangerousAttributes = [
'onload', 'onerror', 'onclick', 'onmouseover', 'onmouseout',
'onfocus', 'onblur', 'onchange', 'onsubmit', 'onreset',
'javascript:', 'vbscript:', 'data:', 'expression('
];
public function filter($data, bool $strict = true)
{
if (is_array($data)) {
return array_map(function($item) use ($strict) {
return $this->filter($item, $strict);
}, $data);
}
if (!is_string($data)) {
return $data;
}
$originalData = $data;
$data = htmlspecialchars($data, ENT_QUOTES | ENT_HTML5, 'UTF-8');
if ($strict) {
$data = strip_tags($data);
} else {
$data = $this->removeDangerousTags($data);
$data = $this->removeDangerousAttributes($data);
}
$data = $this->removeScriptInjection($data);
if ($originalData !== $data) {
Log::warning('检测到潜在XSS攻击', [
'original' => substr($originalData, 0, 200),
'filtered' => substr($data, 0, 200),
'ip' => request()->ip(),
'user_agent' => request()->header('User-Agent')
]);
}
return $data;
}
private function removeDangerousTags(string $data): string
{
foreach ($this->dangerousTags as $tag) {
$pattern = '/<\s*' . preg_quote($tag, '/') . '[^>]*>.*?<\s*\/\s*' . preg_quote($tag, '/') . '\s*>/is';
$data = preg_replace($pattern, '', $data);
$pattern = '/<\s*' . preg_quote($tag, '/') . '[^>]*\/>/is';
$data = preg_replace($pattern, '', $data);
}
return $data;
}
private function removeDangerousAttributes(string $data): string
{
foreach ($this->dangerousAttributes as $attr) {
if (strpos($attr, ':') !== false || strpos($attr, '(') !== false) {
$pattern = '/' . preg_quote($attr, '/') . '/i';
$data = preg_replace($pattern, '', $data);
} else {
$pattern = '/' . preg_quote($attr, '/') . '\s*=\s*["\'][^"\'>]*["\'][^>]*/i';
$data = preg_replace($pattern, '', $data);
}
}
return $data;
}
private function removeScriptInjection(string $data): string
{
$patterns = [
'/<script[^&]*>.*?<\/script>/is',
'/\\u003cscript[^\\]*\\u003e.*?\\u003c\/script\\u003e/is',
'/%3Cscript[^%]*%3E.*?%3C%2Fscript%3E/is',
];
foreach ($patterns as $pattern) {
$data = preg_replace($pattern, '', $data);
}
return $data;
}
public function containsXss(string $data): bool
{
$originalData = $data;
$filteredData = $this->filter($data, false);
return $originalData !== $filteredData;
}
public function isUrlSafe(string $url): bool
{
$allowedProtocols = ['http', 'https', 'ftp', 'ftps'];
$protocol = parse_url($url, PHP_URL_SCHEME);
if (!in_array(strtolower($protocol), $allowedProtocols)) {
return false;
}
$dangerousPatterns = [
'/javascript:/i',
'/vbscript:/i',
'/data:/i',
'/file:/i'
];
foreach ($dangerousPatterns as $pattern) {
if (preg_match($pattern, $url)) {
return false;
}
}
return true;
}
}
|
