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<?php |
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/** |
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* THttpHeaderCSP class |
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* |
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* @author Fabio Bas <ctrlaltca[at]gmail[dot]com> |
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* @link https://github.com/pradosoft/prado |
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* @license https://github.com/pradosoft/prado/blob/master/LICENSE |
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*/ |
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namespace Prado\Web; |
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use Prado; |
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/** |
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* THttpHeaderCSP class. |
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* |
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* THttpHeaderCSP adds a Content-security-policy header to all responses. |
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* If you want to use this header, load your manager class |
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* {@see \Prado\Web\THttpHeadersManager THttpHeadersManager}, |
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* add this class as an header and define the needed policies, eg.: |
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* |
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* ```xml |
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* <module id="headers" class="THttpHeadersManager"> |
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* <header Name="Strict-Transport-Security" Value="max-age=31536000" /> |
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* <header Name="X-Content-Type-Options" Value="nosniff" /> |
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* <header Name="X-Frame-Options" Value="DENY" /> |
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* <header class="THttpHeaderCSP"> |
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* <policy Name="default-src">'self' 'unsafe-inline' www.gstatic.com NONCE</policy> |
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* <policy Name="frame-src">'self' www.google.com</policy> |
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* </header> |
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* </module> |
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* <module id="response" class="THttpResponse" HeadersManager="headers" /> |
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* ``` |
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* |
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* The special value {@see \Prado\Web\THttpHeaderCSP::NONCE NONCE} will get |
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* automatically replaced with a valid Content-security-policy nonce. |
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* |
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* @author Fabio Bas <ctrlaltca[at]gmail[dot]com> |
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* @since 4.3.2 |
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*/ |
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class THttpHeaderCSP extends \Prado\Web\THttpHeader |
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{ |
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/** |
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* @var string[] list of key:value policies. |
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*/ |
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protected $_policies = []; |
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public const NONCE = 'NONCE'; |
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/** |
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* Initializes the CSP header. |
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* @param \Prado\Xml\TXmlElement $config configuration for this module. |
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* @throws TConfigurationException if service parameter is not specified |
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*/ |
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public function init($config) |
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{ |
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parent::init($config); |
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$this->loadPolicies($config); |
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} |
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/** |
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* Load and configure each header. |
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* @param mixed $config configuration node |
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* @throws TConfigurationException if specific pattern class is invalid |
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*/ |
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protected function loadPolicies($config) |
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{ |
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if (is_array($config)) { |
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if (isset($config['policies']) && is_array($config['policies'])) { |
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foreach ($config['policies'] as $policy) { |
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$name = $policy['name']; |
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$this->_policies[$name] = $policy['value']; |
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} |
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} |
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} else { |
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foreach ($config->getElementsByTagName('policy') as $header) { |
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$properties = $header->getAttributes(); |
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$name = $properties->remove('Name'); |
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$this->_policies[$name] = $header->getValue(); |
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} |
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} |
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} |
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/** |
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* @return string the textual name of the header. |
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*/ |
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public function getName() |
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{ |
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return 'Content-Security-Policy'; |
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} |
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/** |
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* @return string the textual value of the header. |
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*/ |
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public function getValue() |
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{ |
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$nonce = '\'nonce-' . Prado::getApplication()->getSecurityManager()->getCSPNonce() .'\''; |
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$ret = ''; |
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foreach($this->_policies as $name => $value) { |
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$ret .= $name . ': ' . str_replace(self::NONCE, $nonce, $value) . '; '; |
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} |
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return $ret; |
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} |
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} |
pradosoft /
prado
