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- module.exports.CreateCrowdSecBouncer = function (parent, config) {
- const obj = {};
- // Setup constants
- const { getLogger } = require('@crowdsec/express-bouncer/src/nodejs-bouncer/lib/logger');
- const { configure, renderBanWall, testConnectionToCrowdSec, getRemediationForIp } = require('@crowdsec/express-bouncer/src/nodejs-bouncer');
- const applyCaptcha = require('@crowdsec/express-bouncer/src/express-crowdsec-middleware/lib/captcha');
- const { BYPASS_REMEDIATION, CAPTCHA_REMEDIATION, BAN_REMEDIATION } = require('@crowdsec/express-bouncer/src/nodejs-bouncer/lib/constants'); // "bypass", "captcha", "ban";
- const svgCaptcha = require('svg-captcha');
- const { renderCaptchaWall } = require('@crowdsec/express-bouncer/src/nodejs-bouncer');
- // Current captcha state
- const currentCaptchaIpList = {};
- // Set the default values. "config" will come in with lowercase names with everything, so we need to correct some value names.
- if (typeof config.useragent != 'string') { config.useragent = 'CrowdSec Express-NodeJS bouncer/v0.0.1'; }
- if (typeof config.timeout != 'number') { config.timeout = 2000; }
- if ((typeof config.fallbackremediation != 'string') || (['bypass', 'captcha', 'ban'].indexOf(config.fallbackremediation) == -1)) { config.fallbackremediation = BAN_REMEDIATION; }
- if (typeof config.maxremediation != 'number') { config.maxremediation = BAN_REMEDIATION; }
- if (typeof config.captchagenerationcacheduration != 'number') { config.captchagenerationcacheduration = 60 * 1000; } // 60 seconds
- if (typeof config.captcharesolutioncacheduration != 'number') { config.captcharesolutioncacheduration = 30 * 60 * 1000; } // 30 minutes
- if (typeof config.captchatexts != 'object') { config.captchatexts = {}; } else {
- if (typeof config.captchatexts.tabtitle == 'string') { config.captchatexts.tabTitle = config.captchatexts.tabtitle; delete config.captchatexts.tabtitle; } // Fix "tabTitle" capitalization
- }
- if (typeof config.bantexts != 'object') { config.bantexts = {}; } else {
- if (typeof config.bantexts.tabtitle == 'string') { config.bantexts.tabTitle = config.bantexts.tabtitle; delete config.bantexts.tabtitle; } // Fix "tabTitle" capitalization
- }
- if (typeof config.colors != 'object') { config.colors = {}; } else {
- var colors = {};
- // All of the values in "text" and "background" sections happen to be lowercase, so, we can use the values as-is.
- if (typeof config.colors.text == 'object') { colors.text = config.colors.text; }
- if (typeof config.colors.background == 'object') { colors.background = config.colors.background; }
- config.colors = colors;
- }
- if (typeof config.hidecrowdsecmentions != 'boolean') { config.hidecrowdsecmentions = false; }
- if (typeof config.customcss != 'string') { delete config.customcss; }
- if (typeof config.bypass != 'boolean') { config.bypass = false; }
- if (typeof config.customlogger != 'object') { delete config.customlogger; }
- if (typeof config.bypassconnectiontest != 'boolean') { config.bypassconnectiontest = false; }
- // Setup the logger
- var logger = config.customLogger ? config.customLogger : getLogger();
- // Configure the bouncer
- configure({
- url: config.url,
- apiKey: config.apikey,
- userAgent: config.useragent,
- timeout: config.timeout,
- fallbackRemediation: config.fallbackremediation,
- maxRemediation: config.maxremediation,
- captchaTexts: config.captchatexts,
- banTexts: config.bantexts,
- colors: config.colors,
- hideCrowdsecMentions: config.hidecrowdsecmentions,
- customCss: config.customcss
- });
- // Test connectivity
- obj.testConnectivity = async function() { return (await testConnectionToCrowdSec())['success']; }
- // Process a web request
- obj.process = async function (domain, req, res, next) {
- try {
- var remediation = config.fallbackremediation;
- try { remediation = await getRemediationForIp(req.clientIp); } catch (ex) { }
- //console.log('CrowdSec', req.clientIp, remediation, req.url);
- switch (remediation) {
- case BAN_REMEDIATION:
- const banWallTemplate = await renderBanWall();
- res.status(403);
- res.send(banWallTemplate);
- return true;
- case CAPTCHA_REMEDIATION:
- if ((currentCaptchaIpList[req.clientIp] == null) || (currentCaptchaIpList[req.clientIp].resolved !== true)) {
- var domainCaptchaUrl = ((domain != null) && (domain.id != '') && (domain.dns == null)) ? ('/' + domain.id + '/captcha.ashx') : '/captcha.ashx';
- if (req.url != domainCaptchaUrl) { res.redirect(domainCaptchaUrl); return true; }
- }
- break;
- }
- } catch (ex) { }
- return false;
- }
- // Process a captcha request
- obj.applyCaptcha = async function (req, res, next) {
- await applyCaptchaEx(req.clientIp, req, res, next, config.captchagenerationcacheduration, config.captcharesolutioncacheduration, logger);
- }
- // Process a captcha request
- async function applyCaptchaEx(ip, req, res, next, captchaGenerationCacheDuration, captchaResolutionCacheDuration, loggerInstance) {
- logger = loggerInstance;
- let error = false;
- if (currentCaptchaIpList[ip] == null) {
- generateCaptcha(ip, captchaGenerationCacheDuration);
- } else {
- if (currentCaptchaIpList[ip] && currentCaptchaIpList[ip].resolved) {
- logger.debug({ type: 'CAPTCHA_ALREADY_SOLVED', ip });
- next();
- return;
- } else {
- if (req.body && req.body.crowdsec_captcha) {
- if (req.body.refresh === '1') { generateCaptcha(ip, captchaGenerationCacheDuration); }
- if (req.body.phrase !== '') {
- if (currentCaptchaIpList[ip].text === req.body.phrase) {
- currentCaptchaIpList[ip].resolved = true;
- setTimeout(function() { if (currentCaptchaIpList[ip]) { delete currentCaptchaIpList[ip]; } }, captchaResolutionCacheDuration);
- res.redirect(req.originalUrl);
- logger.info({ type: 'CAPTCHA_RESOLUTION', ip, result: true });
- return;
- } else {
- logger.info({ type: 'CAPTCHA_RESOLUTION', ip, result: false });
- error = true;
- }
- }
- }
- }
- }
- const captchaWallTemplate = await renderCaptchaWall({ captchaImageTag: currentCaptchaIpList[ip].data, captchaResolutionFormUrl: '', error });
- res.status(401);
- res.send(captchaWallTemplate);
- };
- // Generate a CAPTCHA
- function generateCaptcha(ip, captchaGenerationCacheDuration) {
- const captcha = svgCaptcha.create();
- currentCaptchaIpList[ip] = {
- data: captcha.data,
- text: captcha.text,
- resolved: false,
- };
- setTimeout(() => {
- if (currentCaptchaIpList[ip]) { delete currentCaptchaIpList[ip]; }
- }, captchaGenerationCacheDuration);
- logger.debug({ type: "GENERATE_CAPTCHA", ip });
- };
- return obj;
- }
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