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<?php |
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|
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namespace WP_Defender\Behavior\Scan; |
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|
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use Calotes\Component\Behavior; |
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use WP_Defender\Behavior\WPMUDEV; |
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use WP_Defender\Component\Timer; |
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use WP_Defender\Model\Scan_Item; |
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use WP_Defender\Traits\IO; |
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use WP_Defender\Model\Setting\Scan as Scan_Settings; |
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use WP_Defender\Traits\Plugin; |
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use WP_Defender\Traits\Theme; |
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|
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class Malware_Scan extends Behavior { |
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use IO, Theme, Plugin; |
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|
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public const YARA_RULES = 'defender_yara_rules'; |
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/** |
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* Cache for file content. |
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* @var string |
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*/ |
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private $content; |
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|
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/** |
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* Cache tokens. |
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* @var |
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*/ |
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private $tokens; |
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|
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/** |
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* Backup memory. |
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* @var |
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*/ |
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private $memory; |
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|
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/** |
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* @param object $scan_settings |
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* |
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* @return array |
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*/ |
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protected function get_additional_rules( $scan_settings ) { |
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$plugin_cache = false; |
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$plugin_slugs_changes = array(); |
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$plugin_pro_slugs = array(); |
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$plugin_all_slugs = array(); |
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// Checked Plugin option. |
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if ( $scan_settings->integrity_check && $scan_settings->check_plugins ) { |
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$plugin_cache = true; |
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$arr = get_site_option( Plugin_Integrity::PLUGIN_SLUGS, false ); |
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if ( is_array( $arr ) && ! empty( $arr ) ) { |
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$plugin_slugs_changes = $arr; |
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} |
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$plugin_slugs = get_site_option( Plugin_Integrity::PLUGIN_PREMIUM_SLUGS, false ); |
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if ( is_array( $plugin_slugs ) && ! empty( $plugin_slugs ) ) { |
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$plugin_pro_slugs = $plugin_slugs; |
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} |
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$plugin_all_slugs = $this->get_plugin_slugs(); |
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} |
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|
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return array( |
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'plugin_change' => $plugin_cache, |
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// List of plugins with modifications. |
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'plugin_slugs_changes' => $plugin_slugs_changes, |
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// List of pro plugins. |
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'plugin_pro_slugs' => $plugin_pro_slugs, |
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'plugin_all_slugs' => $plugin_all_slugs, |
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); |
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} |
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|
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/** |
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* @param string $file_path |
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* @param array $rules |
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* |
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* @return bool |
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*/ |
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protected function was_modificated_file( $file_path, $rules ) { |
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// Unchecked 'Plugin change file' option, so green light to display Suspicious checks. |
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if ( ! $rules['plugin_change'] ) { |
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return true; |
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} |
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|
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$search_on_plugin = WP_PLUGIN_DIR . '/'; |
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if ( false !== stripos( $file_path, $search_on_plugin ) ) { |
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/** |
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* Suspicious code in /plugins. |
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* Empty list of plugin slugs because there are premium plugins, |
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* not modifications on Free plugins, |
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* or not plugins on site. |
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* Should check separate custom files/dirs in the root too. |
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*/ |
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$rev_file = str_replace( $search_on_plugin, '', $file_path ); |
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$matches = explode( '/', $rev_file ); |
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$base_slug = array_shift( $matches ); |
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// Custom files/dirs. |
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if ( ! in_array( $base_slug, $rules['plugin_all_slugs'], true ) ) { |
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return true; |
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} |
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if ( empty( $rules['plugin_slugs_changes'] ) && empty( $rules['plugin_pro_slugs'] ) ) { |
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// No modifications. |
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return false; |
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} |
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// Is it on premium plugins? |
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if ( in_array( $base_slug, $rules['plugin_pro_slugs'], true ) ) { |
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return true; |
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} |
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if ( in_array( $base_slug, (array) $rules['plugin_slugs_changes'], true ) ) { |
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// Modifications in this plugin. |
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return true; |
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} |
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// Modifications are not here. |
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return false; |
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} |
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|
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// Other WP places. |
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return true; |
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} |
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|
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public function suspicious_check() { |
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set_time_limit( 0 ); |
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$this->prepare_emergency_shutdown(); |
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$timer = new Timer(); |
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$rules = $this->fetch_yara_rules(); |
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$this->attach_behavior( Malware_Quick_Scan::class, Malware_Quick_Scan::class ); |
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$this->attach_behavior( Malware_Deep_Scan::class, Malware_Deep_Scan::class ); |
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$model = $this->owner->scan; |
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$pos = (int) $model->task_checkpoint; |
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|
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$files = get_site_option( Gather_Fact::CACHE_CONTENT, array() ); |
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if ( empty( $files ) ) { |
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return true; |
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} |
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$combinations = $this->get_additional_rules( new Scan_Settings() ); |
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$files = new \ArrayIterator( $files ); |
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$files->seek( $pos ); |
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while ( $files->valid() ) { |
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if ( ! $timer->check() ) { |
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$this->log( 'Rage quit', 'malware_scan.log' ); |
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$model->save(); |
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break; |
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} |
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if ( $model->is_issue_ignored( $files->current() ) ) { |
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$this->log( sprintf( 'skip %s because of file is ignored', $files->current() ), 'malware_scan.log' ); |
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$files->next(); |
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continue; |
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} |
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|
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[$result, $qs_detail] = $this->do_quick_scan( $files->current(), $rules ); |
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if ( $result ) { |
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$this->log( sprintf( 'file %s suspicious', $files->current() ), 'malware_scan.log' ); |
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$result = $this->do_deep_scan( $files->current(), $rules, $qs_detail ); |
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/** |
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* Add new item if Suspicious code is found and: |
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* plugins/themes are premium, |
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* plugins/themes are on wp.org but the code doesn't match from the WP repo (there are differences in checksums), |
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* deactivated options of File change detection > Scan plugin OR theme file changes |
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*/ |
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if ( is_array( $result ) && $this->was_modificated_file( $files->current(), $combinations ) ) { |
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$result['file'] = $files->current(); |
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$model->add_item( Scan_Item::TYPE_SUSPICIOUS, $result ); |
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} |
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} |
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$files->next(); |
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$model->task_checkpoint = $files->key(); |
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$model->calculate_percent( $files->key() * 100 / $files->count(), 6 ); |
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if ( 0 === $files->key() % 100 ) { |
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// We should update the model percent each 100 files so we have some progress ont he screen$pos * 100 / $core_files->count() |
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$model->save(); |
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} |
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} |
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|
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if ( ! $files->valid() ) { |
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$last = \WP_Defender\Model\Scan::get_last(); |
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if ( is_object( $last ) ) { |
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$ignored_issues = $last->get_issues( Scan_Item::TYPE_SUSPICIOUS, Scan_Item::STATUS_IGNORE ); |
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foreach ( $ignored_issues as $issue ) { |
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$this->owner->scan->add_item( |
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Scan_Item::TYPE_SUSPICIOUS, |
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$issue->raw_data, |
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Scan_Item::STATUS_IGNORE |
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); |
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} |
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} |
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$model->task_checkpoint = null; |
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} |
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|
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$model->save(); |
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|
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return ! $files->valid(); |
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} |
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|
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/** |
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* We will use this for a safe switch when memory out happen. |
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*/ |
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public function prepare_emergency_shutdown() { |
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$this->memory = str_repeat( '*', 1024 * 1024 ); |
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|
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register_shutdown_function( |
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function () { |
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if ( \WP_Defender\Model\Scan::STATUS_FINISH === $this->owner->scan->status ) { |
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return; |
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} |
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|
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$this->memory = null; |
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$err = error_get_last(); |
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if ( |
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( ! is_null( $err ) ) |
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&& ( ! in_array( $err['type'], array( E_NOTICE, E_WARNING, E_DEPRECATED ), true ) ) |
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) { |
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$this->log( var_export( $err, true ), 'scan.log' ); |
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$this->log( 'Something wrong happen, saving and quit.', 'scan.log' ); |
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$this->owner->scan->status = \WP_Defender\Model\Scan::STATUS_ERROR; |
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++$this->owner->scan->task_checkpoint; |
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$this->owner->scan->save(); |
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} |
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} |
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); |
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} |
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|
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/** |
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* Fetch yara rules from API. |
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* |
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* @return array|mixed |
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*/ |
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private function fetch_yara_rules() { |
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$rules = get_site_option( self::YARA_RULES, false ); |
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if ( is_array( $rules ) ) { |
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return $rules; |
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} |
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$this->attach_behavior( WPMUDEV::class, WPMUDEV::class ); |
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$rules = $this->make_wpmu_request( WPMUDEV::API_SCAN_SIGNATURE ); |
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if ( is_array( $rules ) ) { |
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update_site_option( self::YARA_RULES, $rules ); |
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|
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return $rules; |
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} |
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|
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return array(); |
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} |
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} |
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|
