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<?php |
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/** |
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* Handles the security header for 'X-Content-Type-Options'. |
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* |
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* @package WP_Defender\Component\Security_Headers |
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*/ |
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|
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namespace WP_Defender\Component\Security_Headers; |
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|
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use WP_Defender\Component\Security_Header; |
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|
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/** |
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* Manages the 'X-Content-Type-Options' security header. |
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*/ |
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class Sh_Content_Type_Options extends Security_Header { |
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|
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/** |
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* Unique identifier for this security header rule. |
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* |
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* @var string |
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*/ |
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public static $rule_slug = 'sh_content_type_options'; |
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|
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/** |
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* Checks if the Policy should be applied based on the current settings and site configuration. |
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* |
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* @return bool True if the header should be applied, false otherwise. |
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*/ |
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public function check() { |
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$model = $this->get_model(); |
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|
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if ( ! $model->sh_content_type_options ) { |
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return false; |
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} |
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if ( isset( $model->sh_content_type_options_mode ) && 'nosniff' === $model->sh_content_type_options_mode ) { |
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return true; |
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} |
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|
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$headers = $this->head_request( network_site_url(), self::$rule_slug ); |
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if ( is_wp_error( $headers ) ) { |
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$this->log( sprintf( 'Self ping error: %s', $headers->get_error_message() ), wd_internal_log() ); |
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|
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return false; |
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} |
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if ( isset( $headers['x-content-type-options'] ) && is_null( $model->sh_content_type_options_mode ) ) { |
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$model->sh_content_type_options_mode = 'nosniff'; |
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$model->save(); |
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|
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return true; |
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} |
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|
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return false; |
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} |
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|
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/** |
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* Retrieves miscellaneous data related to the Policy. |
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* |
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* @return array Contains introductory text, mode, and values for the Policy. |
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*/ |
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public function get_misc_data() { |
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$model = $this->get_model(); |
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|
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return array( |
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'intro_text' => esc_html__( |
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'The X-Content-Type-Options header is used to protect against MIME sniffing attacks. The most common example of this is when a website allows users to upload content to a website, however the user disguises a particular file type as something else.', |
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'defender-security' |
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), |
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'mode' => $model->sh_content_type_options_mode ?? 'nosniff', |
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); |
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} |
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|
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/** |
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* Registers hooks related to sending headers. |
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*/ |
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public function add_hooks() { |
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add_action( 'send_headers', array( $this, 'append_header' ) ); |
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} |
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|
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/** |
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* Appends the header to the response. |
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*/ |
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public function append_header() { |
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if ( headers_sent() ) { |
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return; |
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} |
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$model = $this->get_model(); |
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if ( ! $this->maybe_submit_header( 'X-Content-Type-Options', false ) ) { |
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// this mean Defender can't override the already output, marked to show notification. |
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|
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return; |
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} |
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if ( true === $model->sh_content_type_options && 'nosniff' === $model->sh_content_type_options_mode ) { |
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header( 'X-Content-Type-Options: nosniff' ); |
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} |
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} |
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|
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/** |
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* Retrieves the title of the Policy. |
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* |
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* @return string The title of the Policy. |
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*/ |
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public function get_title() { |
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return esc_html__( 'X-Content-Type-Options', 'defender-security' ); |
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} |
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} |
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|
