<?php

/**
 * Code related to the settings-general.php interface.
 *
 * PHP version 5
 *
 * @category   Library
 * @package    Sucuri
 * @subpackage SucuriScanner
 * @author     Daniel Cid <dcid@sucuri.net>
 * @copyright  2010-2018 Sucuri Inc.
 * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL2
 * @link       https://wordpress.org/plugins/sucuri-scanner
 */

if (!defined('SUCURISCAN_INIT') || SUCURISCAN_INIT !== true) {
    if (!headers_sent()) {
        /* Report invalid access if possible. */
        header('HTTP/1.1 403 Forbidden');
    }
    exit(1);
}

/**
 * Renders a page with information about the reset options feature.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page with information about the reset options.
 */
function sucuriscan_settings_general_resetoptions($nonce)
{
    // Reset all the plugin's options.
    if ($nonce && SucuriScanRequest::post(':reset_options') !== false) {
        $process = SucuriScanRequest::post(':process_form');

        if (intval($process) === 1) {
            $message = __('Local security logs, hardening and settings were deleted', 'sucuri-scanner');

            sucuriscanResetAndDeactivate(); /* simulate plugin deactivation */

            SucuriScanEvent::reportCriticalEvent($message);
            SucuriScanEvent::notifyEvent('plugin_change', $message);
            SucuriScanInterface::info(__('Local security logs, hardening and settings were deleted', 'sucuri-scanner'));
        } else {
            SucuriScanInterface::error(__('You need to confirm that you understand the risk of this operation.', 'sucuri-scanner'));
        }
    }

    return SucuriScanTemplate::getSection('settings-general-resetoptions');
}

/**
 * Renders a page with information about the data storage feature.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page with information about the data storage.
 */
function sucuriscan_settings_general_datastorage($nonce)
{
    $params = array();
    $files = array(
        '<root>' => __('Directory used to store the plugin settings, cache and system logs', 'sucuri-scanner'),
        'auditlogs' => sprintf(__('Cache to store the system logs obtained from the API service; expires after %s seconds.', 'sucuri-scanner'), SUCURISCAN_AUDITLOGS_LIFETIME),
        'auditqueue' => __('Local queue to store the most recent logs before they are sent to the remote API service.', 'sucuri-scanner'),
        'blockedusers' => __('Deprecated on 1.8.12; it was used to store a list of blocked user names.', 'sucuri-scanner'), /* TODO: deprecated on 1.8.12 */
        'failedlogins' => __('Stores the data for every failed login attempt. The data is moved to "oldfailedlogins" every hour during a brute force password attack.', 'sucuri-scanner'),
        'hookdata' => __('Temporarily stores data to complement the logs during destructive operations like deleting a post, page, comment, etc.', 'sucuri-scanner'),
        'ignorescanning' => __('Stores a list of files and folders chosen by the user to be ignored by the file system scanner.', 'sucuri-scanner'),
        'integrity' => __('Stores a list of files marked as fixed by the user via the WordPress Integrity tool.', 'sucuri-scanner'),
        'lastlogins' => __('Stores the data associated to every successful user login. The data never expires; manually delete if the file is too large.', 'sucuri-scanner'),
        'oldfailedlogins' => __('Stores the data for every failed login attempt after the plugin sends a report about a brute force password attack via email.', 'sucuri-scanner'),
        'plugindata' => sprintf(__('Cache to store the data associated to the installed plugins listed in the Post-Hack page. Expires after %s seconds.', 'sucuri-scanner'), SUCURISCAN_GET_PLUGINS_LIFETIME),
        'settings' => __('Stores all the options used to configure the functionality and behavior of the plugin.', 'sucuri-scanner'),
        'sitecheck' => sprintf(__('Cache to store the result of the malware scanner. Expires after %s seconds, reset at any time to force a re-scan.', 'sucuri-scanner'), SUCURISCAN_SITECHECK_LIFETIME),
        'trustip' => __('Stores a list of IP addresses trusted by the plugin, events triggered by one of these IPs will not be reported to the remote monitoring API service.', 'sucuri-scanner'),
    );

    $params['Storage.Files'] = '';
    $params['Storage.Path'] = SucuriScan::dataStorePath();

    if ($nonce) {
        $filenames = SucuriScanRequest::post(':filename', '_array');

        if ($filenames) {
            $deleted = 0;

            foreach ($filenames as $filename) {
                $short = substr($filename, 7); /* drop directroy path */
                $short = substr($short, 0, -4); /* drop file extension */

                if (!$short || empty($short) || !array_key_exists($short, $files)) {
                    continue; /* prevent path traversal */
                }

                $filepath = SucuriScan::dataStorePath($filename);

                if (!file_exists($filepath) || is_dir($filepath)) {
                    continue; /* there is nothing to reset */
                }

                /* ignore write permissions */
                if (@unlink($filepath)) {
                    $deleted++;
                }
            }

            // Register on audit logs and return result.
            SucuriScanEvent::reportInfoEvent(
                sprintf(
                    __('%s were deleted.', 'sucuri-scanner'),
                    implode(', ', $filenames)
                )
            );

            SucuriScanInterface::info(
                sprintf(
                    __('%d out of %d files have been deleted.', 'sucuri-scanner'),
                    $deleted,
                    count($filenames)
                )
            );
        }
    }

    foreach ($files as $name => $desc) {
        if ($name === '<root>') {
            /* convert to folder */
            $name = '';
        }

        $fsize = 0;
        $fname = ($name ? sprintf('sucuri-%s.php', $name) : '');
        $fpath = SucuriScan::dataStorePath($fname);
        $disabled = 'disabled="disabled"';
        $iswritable = __('Not Writable', 'sucuri-scanner');
        $exists = __('Does Not Exist', 'sucuri-scanner');
        $labelExistence = 'danger';
        $labelWritability = 'default';

        if (file_exists($fpath)) {
            $fsize = @filesize($fpath);
            $exists = __('Exists', 'sucuri-scanner');
            $labelExistence = 'success';
            $labelWritability = 'danger';

            if (is_writable($fpath)) {
                $disabled = ''; /* Allow file deletion */
                $iswritable = __('Writable', 'sucuri-scanner');
                $labelWritability = 'success';
            }
        }

        $params['Storage.Filename'] = $fname;
        $params['Storage.Filepath'] = str_replace(ABSPATH, '', $fpath);
        $params['Storage.Filesize'] = SucuriScan::humanFileSize($fsize);
        $params['Storage.Exists'] = $exists;
        $params['Storage.IsWritable'] = $iswritable;
        $params['Storage.DisabledInput'] = $disabled;
        $params['Storage.Existence'] = $labelExistence;
        $params['Storage.Writability'] = $labelWritability;
        $params['Storage.Description'] = $desc;

        if (is_dir($fpath)) {
            $params['Storage.Filesize'] = '';
            $params['Storage.DisabledInput'] = 'disabled="disabled"';
        }

        $params['Storage.Files'] .= SucuriScanTemplate::getSnippet('settings-general-datastorage', $params);
    }

    return SucuriScanTemplate::getSection('settings-general-datastorage', $params);
}

/**
 * Returns the path to the local event monitoring file.
 *
 * The website owner can configure the plugin to send a copy of the security
 * events to a local file that can be integrated with other monitoring systems
 * like OSSEC, OpenVAS, NewRelic and similar.
 *
 * @return string|bool Path to the log file, false if disabled.
 */
function sucuriscan_selfhosting_fpath()
{
    $monitor = SucuriScanOption::getOption(':selfhosting_monitor');
    $monitor_fpath = SucuriScanOption::getOption(':selfhosting_fpath');
    $folder = dirname($monitor_fpath);

    if ($monitor === 'enabled'
        && !empty($monitor_fpath)
        && is_writable($folder)
    ) {
        return $monitor_fpath;
    }

    return false;
}

/**
 * Renders a page with information about the self-hosting feature.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page with information about the self-hosting.
 */
function sucuriscan_settings_general_selfhosting($nonce)
{
    $params = array();

    $params['SelfHosting.DisabledVisibility'] = 'visible';
    $params['SelfHosting.Status'] = __('Enabled', 'sucuri-scanner');
    $params['SelfHosting.SwitchText'] = __('Disable', 'sucuri-scanner');
    $params['SelfHosting.SwitchValue'] = 'disable';
    $params['SelfHosting.FpathVisibility'] = 'hidden';
    $params['SelfHosting.Fpath'] = '';

    if ($nonce) {
        // Set a file path for the self-hosted event monitor.
        $monitor_fpath = SucuriScanRequest::post(':selfhosting_fpath');

        if ($monitor_fpath !== false) {
            if (empty($monitor_fpath)) {
                $message = __('Log exporter was disabled', 'sucuri-scanner');

                SucuriScanEvent::reportInfoEvent($message);
                SucuriScanOption::deleteOption(':selfhosting_fpath');
                SucuriScanOption::updateOption(':selfhosting_monitor', 'disabled');
                SucuriScanEvent::notifyEvent('plugin_change', $message);
                SucuriScanInterface::info(__('The log exporter feature has been disabled', 'sucuri-scanner'));
            } elseif (strpos($monitor_fpath, $_SERVER['DOCUMENT_ROOT']) !== false) {
                SucuriScanInterface::error(__('File should not be publicly accessible.', 'sucuri-scanner'));
            } elseif (file_exists($monitor_fpath)) {
                SucuriScanInterface::error(__('File already exists and will not be overwritten.', 'sucuri-scanner'));
            } elseif (!is_writable(dirname($monitor_fpath))) {
                SucuriScanInterface::error(__('File parent directory is not writable.', 'sucuri-scanner'));
            } else {
                @file_put_contents($monitor_fpath, '', LOCK_EX);

                $message = __('Log exporter file path was correctly set', 'sucuri-scanner');

                SucuriScanEvent::reportInfoEvent($message);
                SucuriScanOption::updateOption(':selfhosting_monitor', 'enabled');
                SucuriScanOption::updateOption(':selfhosting_fpath', $monitor_fpath);
                SucuriScanEvent::notifyEvent('plugin_change', $message);
                SucuriScanInterface::info(__('The log exporter feature has been enabled and the data file was successfully set.', 'sucuri-scanner'));
            }
        }
    }

    $monitor = SucuriScanOption::getOption(':selfhosting_monitor');
    $monitor_fpath = SucuriScanOption::getOption(':selfhosting_fpath');

    if ($monitor === 'disabled') {
        $params['SelfHosting.Status'] = __('Disabled', 'sucuri-scanner');
        $params['SelfHosting.SwitchText'] = __('Enable', 'sucuri-scanner');
        $params['SelfHosting.SwitchValue'] = 'enable';
    }

    if ($monitor === 'enabled' && $monitor_fpath) {
        $params['SelfHosting.DisabledVisibility'] = 'hidden';
        $params['SelfHosting.FpathVisibility'] = 'visible';
        $params['SelfHosting.Fpath'] = SucuriScan::escape($monitor_fpath);
    }

    return SucuriScanTemplate::getSection('settings-general-selfhosting', $params);
}

/**
 * Renders a page with information about the reverse proxy feature.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page with information about the reverse proxy.
 */
function sucuriscan_settings_general_reverseproxy($nonce)
{
    $params = array(
        'ReverseProxyStatus' => __('Enabled', 'sucuri-scanner'),
        'ReverseProxySwitchText' => __('Disable', 'sucuri-scanner'),
        'ReverseProxySwitchValue' => 'disable',
    );

    // Enable or disable the reverse proxy support.
    if ($nonce) {
        $revproxy = SucuriScanRequest::post(':revproxy', '(en|dis)able');

        if ($revproxy) {
            if ($revproxy === 'enable') {
                SucuriScanOption::setRevProxy('enable');
                SucuriScanOption::setAddrHeader('HTTP_X_SUCURI_CLIENTIP');
            } else {
                SucuriScanOption::setRevProxy('disable');
                SucuriScanOption::setAddrHeader('REMOTE_ADDR');
            }
        }
    }

    if (SucuriScanOption::isDisabled(':revproxy')) {
        $params['ReverseProxyStatus'] = __('Disabled', 'sucuri-scanner');
        $params['ReverseProxySwitchText'] = __('Enable', 'sucuri-scanner');
        $params['ReverseProxySwitchValue'] = 'enable';
    }

    return SucuriScanTemplate::getSection('settings-general-reverseproxy', $params);
}

/**
 * Renders a page with information about the IP discoverer feature.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page with information about the IP discoverer.
 */
function sucuriscan_settings_general_ipdiscoverer($nonce)
{
    $params = array(
        'TopLevelDomain' => __('unknown', 'sucuri-scanner'),
        'WebsiteHostName' => __('unknown', 'sucuri-scanner'),
        'WebsiteHostAddress' => __('unknown', 'sucuri-scanner'),
        'IsUsingFirewall' => __('unknown', 'sucuri-scanner'),
        'WebsiteURL' => __('unknown', 'sucuri-scanner'),
        'RemoteAddress' => '127.0.0.1',
        'RemoteAddressHeader' => __('INVALID', 'sucuri-scanner'),
        'AddrHeaderOptions' => '',
        /* Switch form information. */
        'DnsLookupsStatus' => __('Enabled', 'sucuri-scanner'),
        'DnsLookupsSwitchText' => __('Disable', 'sucuri-scanner'),
        'DnsLookupsSwitchValue' => 'disable',
    );

    // Get main HTTP header for IP retrieval.
    $allowed_headers = SucuriScan::allowedHttpHeaders(true);

    // Configure the DNS lookups option for reverse proxy detection.
    if ($nonce) {
        $dns_lookups = SucuriScanRequest::post(':dns_lookups', '(en|dis)able');
        $addr_header = SucuriScanRequest::post(':addr_header');

        if ($dns_lookups) {
            $action_d = $dns_lookups . 'd';
            $message = sprintf(__('DNS lookups for reverse proxy detection <code>%s</code>', 'sucuri-scanner'), $action_d);

            SucuriScanOption::updateOption(':dns_lookups', $action_d);
            SucuriScanEvent::reportInfoEvent($message);
            SucuriScanEvent::notifyEvent('plugin_change', $message);
            SucuriScanInterface::info(__('The status of the DNS lookups for the reverse proxy detection has been changed', 'sucuri-scanner'));
        }

        if ($addr_header) {
            if ($addr_header === 'REMOTE_ADDR') {
                SucuriScanOption::setAddrHeader('REMOTE_ADDR');
                SucuriScanOption::setRevProxy('disable');
            } else {
                SucuriScanOption::setAddrHeader($addr_header);
                SucuriScanOption::setRevProxy('enable');
            }
        }
    }

    if (SucuriScanOption::isDisabled(':dns_lookups')) {
        $params['DnsLookupsStatus'] = __('Disabled', 'sucuri-scanner');
        $params['DnsLookupsSwitchText'] = __('Enable', 'sucuri-scanner');
        $params['DnsLookupsSwitchValue'] = 'enable';
    }

    $proxy_info = SucuriScan::isBehindFirewall(true);
    $base_domain = SucuriScan::getDomain(true);

    $params['TopLevelDomain'] = $proxy_info['http_host'];
    $params['WebsiteHostName'] = $proxy_info['host_name'];
    $params['WebsiteHostAddress'] = $proxy_info['host_addr'];
    $params['RemoteAddressHeader'] = SucuriScan::getRemoteAddrHeader();
    $params['RemoteAddress'] = SucuriScan::getRemoteAddr();
    $params['WebsiteURL'] = SucuriScan::getDomain();
    $params['AddrHeaderOptions'] = SucuriScanTemplate::selectOptions(
        $allowed_headers, /* list is limited to a few options */
        SucuriScanOption::getOption(':addr_header')
    );
    $params['IsUsingFirewall'] = $proxy_info['status'] ? 'active' : 'not active';

    if ($base_domain !== $proxy_info['http_host']) {
        $params['TopLevelDomain'] = sprintf('%s (%s)', $params['TopLevelDomain'], $base_domain);
    }

    return SucuriScanTemplate::getSection('settings-general-ipdiscoverer', $params);
}

/**
 * Renders a page with information about the import export feature.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page with information about the import export.
 */
function sucuriscan_settings_general_importexport($nonce)
{
    $settings = array();
    $params = array();
    $allowed = array(
        ':addr_header',
        ':api_protocol',
        ':api_service',
        ':cloudproxy_apikey',
        ':diff_utility',
        ':dns_lookups',
        ':email_subject',
        ':emails_per_hour',
        ':ignored_events',
        ':lastlogin_redirection',
        ':maximum_failed_logins',
        ':notify_available_updates',
        ':notify_bruteforce_attack',
        ':notify_failed_login',
        ':notify_plugin_activated',
        ':notify_plugin_change',
        ':notify_plugin_deactivated',
        ':notify_plugin_deleted',
        ':notify_plugin_installed',
        ':notify_plugin_updated',
        ':notify_post_publication',
        ':notify_scan_checksums',
        ':notify_settings_updated',
        ':notify_success_login',
        ':notify_theme_activated',
        ':notify_theme_deleted',
        ':notify_theme_editor',
        ':notify_theme_installed',
        ':notify_theme_updated',
        ':notify_to',
        ':notify_user_registration',
        ':notify_website_updated',
        ':notify_widget_added',
        ':notify_widget_deleted',
        ':prettify_mails',
        ':revproxy',
        ':selfhosting_fpath',
        ':selfhosting_monitor',
        ':use_wpmail',
    );

    if ($nonce && SucuriScanRequest::post(':import') !== false) {
        $process = SucuriScanRequest::post(':process_form');

        if (intval($process) === 1) {
            $json = SucuriScanRequest::post(':settings');
            $json = str_replace('\&quot;', '"', $json);
            $data = @json_decode($json, true);

            if ($data) {
                $count = 0;
                $total = count($data);

                /* minimum length for option name */
                $minLength = strlen(SUCURISCAN . '_');

                foreach ($data as $option => $value) {
                    if (strlen($option) <= $minLength) {
                        continue;
                    }

                    $option_name = ':' . substr($option, $minLength);

                    /* check if the option can be imported */
                    if (!in_array($option_name, $allowed)) {
                        continue;
                    }

                    SucuriScanOption::updateOption($option_name, $value);

                    $count++;
                }

                /* import trusted ip addresses */
                if (array_key_exists('trusted_ips', $data) && is_array($data)) {
                    $cache = new SucuriScanCache('trustip');

                    foreach ($data['trusted_ips'] as $trustedIP) {
                        $trustedIP = str_replace('\/', '/', $trustedIP);
                        $trustedIP = str_replace('/32', '', $trustedIP);

                        if (SucuriScan::isValidIP($trustedIP) || SucuriScan::isValidCIDR($trustedIP)) {
                            $ipInfo = SucuriScan::getIPInfo($trustedIP);
                            $cacheKey = md5($ipInfo['remote_addr']);
                            $ipInfo['added_at'] = time();

                            if (!$cache->exists($cacheKey)) {
                                $cache->add($cacheKey, $ipInfo);
                            }
                        }
                    }
                }

                SucuriScanInterface::info(
                    sprintf(
                        __('%d out of %d option have been successfully imported', 'sucuri-scanner'),
                        $count,
                        $total
                    )
                );
            } else {
                SucuriScanInterface::error(__('Data is incorrectly encoded', 'sucuri-scanner'));
            }
        } else {
            SucuriScanInterface::error(__('You need to confirm that you understand the risk of this operation.', 'sucuri-scanner'));
        }
    }

    foreach ($allowed as $option) {
        $option_name = SucuriScan::varPrefix($option);
        $settings[$option_name] = SucuriScanOption::getOption($option);
    }

    /* include the trusted IP address list */
    $settings['trusted_ips'] = array();
    $cache = new SucuriScanCache('trustip');
    $trusted = $cache->getAll();
    foreach ($trusted as $trustedIP) {
        $settings['trusted_ips'][] = $trustedIP->cidr_format;
    }

    $params['Export'] = @json_encode($settings);

    return SucuriScanTemplate::getSection('settings-general-importexport', $params);
}

/**
 * Renders a page with the option to configure the timezone.
 *
 * @param bool $nonce True if the CSRF protection worked.
 * @return string Page to configure the timezone.
 */
function sucuriscan_settings_general_timezone($nonce)
{
    $params = array();
    $current = time();
    $options = array();
    $offsets = array(
        -12.0, -11.5, -11.0, -10.5, -10.0, -9.50, -9.00, -8.50, -8.00, -7.50,
        -7.00, -6.50, -6.00, -5.50, -5.00, -4.50, -4.00, -3.50, -3.00, -2.50,
        -2.00, -1.50, -1.00, -0.50, +0.00, +0.50, +1.00, +1.50, +2.00, +2.50,
        +3.00, +3.50, +4.00, +4.50, +5.00, +5.50, +5.75, +6.00, +6.50, +7.00,
        +7.50, +8.00, +8.50, +8.75, +9.00, +9.50, 10.00, 10.50, 11.00, 11.50,
        12.00, 12.75, 13.00, 13.75, 14.00
    );

    foreach ($offsets as $hour) {
        $sign = ($hour < 0) ? '-' : '+';
        $fill = (abs($hour) < 10) ? '0' : '';
        $keyname = sprintf('UTC%s%s%.2f', $sign, $fill, abs($hour));
        $label = date('d M, Y H:i:s', $current + ($hour * 3600));
        $options[$keyname] = $keyname . ' (' . $label . ')';
    }

    if ($nonce) {
        $pattern = 'UTC[\-\+][0-9]{2}\.[0-9]{2}';
        $timezone = SucuriScanRequest::post(':timezone', $pattern);

        if ($timezone) {
            $message = sprintf(__('Timezone override will use %s', 'sucuri-scanner'), $timezone);

            SucuriScanOption::updateOption(':timezone', $timezone);
            SucuriScanEvent::reportInfoEvent($message);
            SucuriScanEvent::notifyEvent('plugin_change', $message);
            SucuriScanInterface::info(__('The timezone for the date and time in the audit logs has been changed', 'sucuri-scanner'));
        }
    }

    $val = SucuriScanOption::getOption(':timezone');
    $params['Timezone.Dropdown'] = SucuriScanTemplate::selectOptions($options, $val);
    $params['Timezone.Example'] = SucuriScan::datetime();

    return SucuriScanTemplate::getSection('settings-general-timezone', $params);
}
