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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2019 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\TemplateChecks; |
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use DOMAttr; |
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use DOMElement; |
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use DOMText; |
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use DOMXPath; |
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use s9e\TextFormatter\Configurator\Helpers\NodeLocator; |
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use s9e\TextFormatter\Configurator\Items\Attribute; |
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use s9e\TextFormatter\Configurator\Items\Tag; |
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/** |
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* This primary use of this check is to ensure that dynamic content cannot be used to create |
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* javascript: links |
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*/ |
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class DisallowUnsafeDynamicURL extends AbstractDynamicContentCheck |
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{ |
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/** |
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* @var string Regexp used to exclude nodes that start with a hardcoded scheme part, a hardcoded |
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* local part, or a fragment |
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*/ |
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protected $safeUrlRegexp = '(^(?:(?!data|\\w*script)\\w+:|[^:]*/|#))i'; |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function getNodes(DOMElement $template) |
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{ |
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return NodeLocator::getURLNodes($template->ownerDocument); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function isSafe(Attribute $attribute) |
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{ |
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return $attribute->isSafeAsURL(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function checkAttributeNode(DOMAttr $attribute, Tag $tag) |
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{ |
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if (!$this->isSafeUrl($attribute->value)) |
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{ |
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parent::checkAttributeNode($attribute, $tag); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function checkElementNode(DOMElement $element, Tag $tag) |
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{ |
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if (!$this->elementHasSafeUrl($element)) |
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{ |
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parent::checkElementNode($element, $tag); |
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} |
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} |
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/** |
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* Test whether every branch of a given xsl:choose element contains a known-safe URL |
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* |
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* @param DOMElement $choose |
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* @return bool |
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*/ |
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protected function chooseHasSafeUrl(DOMElement $choose) |
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{ |
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$xpath = new DOMXPath($choose->ownerDocument); |
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foreach ($xpath->query('xsl:when | xsl:otherwise', $choose) as $branch) |
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{ |
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if (!$this->elementHasSafeUrl($branch)) |
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{ |
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return false; |
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} |
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if ($branch->nodeName === 'xsl:otherwise') |
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{ |
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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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* Test whether given element contains a known-safe URL |
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* |
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* @param DOMElement $element |
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* @return bool |
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*/ |
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protected function elementHasSafeUrl(DOMElement $element) |
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{ |
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if ($element->firstChild instanceof DOMElement && $element->firstChild->nodeName === 'xsl:choose') |
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{ |
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return $this->chooseHasSafeUrl($element->firstChild); |
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} |
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return $element->firstChild instanceof DOMText && $this->isSafeUrl($element->firstChild->textContent); |
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} |
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/** |
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* Test whether given URL is known to be safe |
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* |
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* @param string $url |
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* @return bool |
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*/ |
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protected function isSafeUrl($url) |
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{ |
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return (bool) preg_match($this->safeUrlRegexp, $url); |
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} |
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} |
s9e /
TextFormatter
