all files / src/controllers/ server-details.js

83.76% Statements 165/197
71.58% Branches 68/95
89.29% Functions 25/28
83.76% Lines 165/197
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'use strict';
 
var _ = require('lodash'),
   _s = require('underscore.string'),
   Q = require('q'),
   fs = require('fs'),
   path = require('path'),
   zlib = require('zlib'),
   zlib_unzip = Q.denodeify(zlib.unzip),
   semver = require('semver'),
   htmlparser = require('htmlparser2'),
   config = require(__dirname + '/../config'),
   logger = require(__dirname + '/../loggers/logger'),
   azSrc = '/../html_analyzer',
   OwaAnalyzer = require(__dirname + azSrc + '/outlook_web_access'),
   GeneratorTagAnalyzer = require(__dirname + azSrc + '/meta_generator_tags'),
   fs_stat = Q.denodeify(fs.stat),
   fs_readFile = Q.denodeify(fs.readFile),
   configFolder = path.join(__dirname, '../../', 'config');
 
Q.longStackSupport = true;
 
// export namespace as `serverDetails`
var serverDetails = exports;
 
var serverVulnerabilityMap = {};
var serverVulnerabilityMapLastModified = null;
 
var getValue = function (obj, property) {
   return _.isUndefined(obj[property]) ? ''  : obj[property];
};
 
var genericParseHeader = function (serverHeader) {
   // Header pattern for iis server - 'Microsoft-IIS/8.5'
   // Header pattern for nginx server - 'nginx/1.7.4'
   var serverInfo = {},
      sWords = _s.words(serverHeader, '/');
 
   Eif (sWords.length > 0) {
      serverInfo.name = _s.trim(sWords[0]);
   }
   if (sWords.length > 1) {
      sWords[1] = _s.strLeft(sWords[1], '-');
      if (serverInfo.name.toLowerCase() === 'openssl') {
         serverInfo.version = _s.trim(sWords[1]);
      } else {
         serverInfo.version = _s.trim(sWords[1]);
      }
   }
 
   return serverInfo;
};
 
var getServerInfoFromServerHeader = function (serverHeader) {
 
   var apacheKeywords = ['Apache', 'mod_ssl', 'OpenSSL', 'PHP', 'Perl', 'Python'],
      genericServerKeywords = ['Microsoft-IIS', 'nginx'],
      serverInfos= [];
 
   serverHeader = _s.trim(serverHeader);
   if (_s.startsWith(serverHeader.toLowerCase(), 'apache')) {
      // Header pattern for -
      // Apache server - 'Apache/2.4.7 (Ubuntu)'
      // Openssl server - 'Apache/2.2.3 (Unix) mod_ssl/2.2.3 OpenSSL/0.9.7g'
      var apacheWords = _s.words(serverHeader);
 
      _.forEach(apacheWords, function (word) {
         word = _s.trim(word);
 
         var apacheKeywordsLength = apacheKeywords.length,
            i = 0;
 
         for (i = 0; i < apacheKeywordsLength; i++) {
            if (_s.startsWith(word.toLowerCase(),
                  apacheKeywords[i].toLowerCase())) {
               var oServerInfo = genericParseHeader(word);
               Eif (!_.isEmpty(getValue(oServerInfo, 'name'))) {
                  serverInfos.push(oServerInfo);
               }
               break;
            }
         }
      });
   } else {
      var genericServerKeywordsLength = genericServerKeywords.length,
         j = 0;
 
      for (j = 0; j < genericServerKeywordsLength; j++) {
         if (!_s.startsWith(serverHeader.toLowerCase(),
               genericServerKeywords[j].toLowerCase())) {
            continue;
         }
 
         var serverHeaderWord = _s.words(serverHeader),
            gServerInfo = genericParseHeader(serverHeaderWord[0]);
         Eif (!_.isEmpty(getValue(gServerInfo, 'name'))) {
            serverInfos.push(gServerInfo);
         }
         break;
      }
   }
 
   return serverInfos;
};
 
 
var getServerInfoFromXPoweredByHeader = function (xPoweredByHeader) {
   // Header pattern for PHP server - 'PHP/5.5.11-2',
   var genericServerKeywords = ['PHP'],
      length = genericServerKeywords.length,
      serverInfos= [],
      j = 0;
 
   xPoweredByHeader = _s.trim(xPoweredByHeader);
   for (j = 0; j < length; j++) {
      if (_s.startsWith(xPoweredByHeader.toLowerCase(),
            genericServerKeywords[j].toLowerCase())) {
         var serverHeaderWord = _s.words(xPoweredByHeader),
            gServerInfo = genericParseHeader(serverHeaderWord[0]);
         Eif (!_.isEmpty(getValue(gServerInfo, 'name'))) {
            serverInfos.push(gServerInfo);
         }
         break;
      }
   }
   return serverInfos;
};
 
var getServerInfoFromXAspNetVersionHeader = function (xAspnetVersionHeader) {
   //Header pattern for Asp.Net server - '2.0.50727'
   var serverInfo = {};
   serverInfo.name = 'ASP.NET';
   serverInfo.version = _s.trim(xAspnetVersionHeader).replace(/[^\d.]/g, '');
   return serverInfo;
};
 
var getServerInfoFromViaHeader = function (viaHeader) {
   //Header pattern for squid server - '1.1 localhost (squid/3.2.7)'
   var serverInfo = null;
 
   viaHeader = _s.trim(viaHeader);
   Iif (viaHeader.indexOf('squid') > -1) {
      var viaHeaderWords = _s.words(viaHeader);
      _.forEach(viaHeaderWords, function (word) {
         if (word.indexOf('squid') > -1) {
            word = _s.strRight(word, '(');
            word = _s.strLeftBack(word, ')');
            word = _s.trim(word);
            serverInfo = genericParseHeader(word);
         }
      });
   }
   return serverInfo;
};
 
var walkDomTree = function (testFn, elems, url,
      maxWidth, maxDepth, currentDepth) {
 
   var width = elems.length;
   Iif (width > maxWidth) {
      width = maxWidth;
   }
 
   for(var i = 0; i < width; i++){
      testFn(elems[i]);
 
      var childs = elems[i].children;
      if(childs && childs.length > 0){
         if ((currentDepth + 1) < maxDepth) {
            walkDomTree(testFn, childs, url, maxWidth,
                  maxDepth, currentDepth + 1);
         }
      }
   }
};
 
var parseHtml = function (htmlContents, interestedDomAnalyzers, url) {
   var buffer = new Buffer(htmlContents, 'base64');
   return zlib_unzip(buffer)
      .then(function (uncompressed) {
         Iif (!uncompressed) {
            return;
         }
 
         var dom = htmlparser.parseDOM(uncompressed);
         Iif (!dom) {
            logger.warn('Unable to get dom');
            return;
         }
 
         var inspectDomElementFn = function (element) {
            _.forEach(interestedDomAnalyzers, function (analyzer) {
               analyzer.inspectDomNode(element);
            });
         };
 
         walkDomTree(inspectDomElementFn, dom, url,
                     config.pnr_enforcement.dom_walker_max_width,
                     config.pnr_enforcement.dom_walker_max_depth,
                     0 /*currentDepth*/);
      });
};
 
var getSemanticVersion = function (serverName, version){
   Iif (!version) {
      return version;
   }
 
   version = _s.trim(version).replace(/[^\d.]/g, '');
   var versionWords = _s.words(version, '.');
   Iif (versionWords.length > 3) {
      versionWords = _.first(versionWords, 3);
   }
   version = versionWords.join('.');
 
   switch (versionWords.length) {
   case 1:
      version = version + '.0.0';
      break;
   case 2:
      version = version + '.0';
      break;
   case 3:
      //No change
      break;
   case 0:
      /* falls through */
   default:
      logger.info('Invalid version - ' + version);
   }
 
   Iif ((serverName.toLowerCase() === 'openssl') && (versionWords.length === 3)) {
      //It may contain alphabets in the end. Convert them to numbers such that a -> 1
      var modPatchVersion = '',
         patchVersion = _s.rpad(versionWords[2], 3, '0');
 
      for (var i = 0; i < 3; i++){
         var code = patchVersion.charCodeAt(i);
         if ((code >= 97) && (code <= 122)) {
            // It is a letter. Subtract 96 so that a -> int 1.
            // The add 48 to get int 1 -> ascii 1
            var diff = code - 96,
              str = _s.lpad(diff.toString(), 2, '0');
            modPatchVersion += str;
 
         } else {
            modPatchVersion += '0' + patchVersion.charAt(i);
         }
      }
      if (_s.startsWith(modPatchVersion, '0')) {
         modPatchVersion = _s.strRight(modPatchVersion, '0');
      }
 
      version = versionWords[0] + '.' + versionWords[1] + '.' + modPatchVersion;
   }
   return version;
};
 
var checkVersions = function (serverInfos, vulnerabilityMap) {
   _.forEach(serverInfos, function (serverInfo) {
      if (_.isEmpty(serverInfo.name) || _.isEmpty(serverInfo.version)){
         serverInfo.is_vulnerable = 'Unknown';
         logger.debug('No version info - ' + serverInfo.name);
         return;
      }
 
      var vulnerableVersions = getValue(vulnerabilityMap, serverInfo.name.toLowerCase());
      if (_.isEmpty(vulnerableVersions)) {
         serverInfo.is_vulnerable = 'Unknown';
         logger.debug('No vulnerability mapping found for server - ' + serverInfo.name);
      } else {
         var version = getSemanticVersion(serverInfo.name, serverInfo.version),
            isVulnerable = false;
         Eif (!_.isArray(vulnerableVersions)) {
            vulnerableVersions = [vulnerableVersions];
         }
         for (var i = 0; i < vulnerableVersions.length; i++) {
            try {
               isVulnerable = semver.satisfies(version,
                     vulnerableVersions[i], true);
            } catch (ex) {
               logger.info('error="semver parsing error"' +
                     ' exception="' + ex + '"');
            }
 
            if (isVulnerable) {
               break;
            }
         }
         serverInfo.is_vulnerable = isVulnerable.toString();
      }
   });
};
 
 
serverDetails.getServerInfo = function (headers, fingerPrints) {
   var url =  getValue(headers, 'url'),
      serverHeader = getValue(headers, 'server'),
      xPoweredByHeader = getValue(headers, 'x-powered-by'),
      xAspnetVersionHeader = getValue(headers, 'x-aspnet-version'),
      viaHeader = getValue(headers, 'via'),
      //xModPagespeedHeader = getValue(headers, 'x-mod-pagespeed'),
      //xPoweredByPleskHeader = getValue(headers, 'x-powered-by-plesk'),
      //wpSuperCacheHeader = getValue(headers, 'wp-super-cache'),
      //xT3cacheHeader = getValue(headers, 'x-t3cache'),
      //xDrupalCacheHeader = getValue(headers, 'x-drupal-cache'),
      serverInfos = [],
      s = null;
 
   if (!_.isEmpty(serverHeader)) {
      s = getServerInfoFromServerHeader(serverHeader);
      if (!_.isEmpty(s)) {
         serverInfos = _.union(serverInfos, s);
      }
   }
 
   if (!_.isEmpty(xPoweredByHeader)) {
      s = getServerInfoFromXPoweredByHeader(xPoweredByHeader);
      if (!_.isEmpty(s)) {
         serverInfos = _.union(serverInfos, s);
      }
   }
 
   if (!_.isEmpty(xAspnetVersionHeader)) {
      s = getServerInfoFromXAspNetVersionHeader(xAspnetVersionHeader);
      Eif (!_.isEmpty(s)) {
         serverInfos = _.union(serverInfos, s);
      }
   }
 
   if (!_.isEmpty(viaHeader)) {
      s = getServerInfoFromViaHeader(viaHeader);
      Iif (!_.isEmpty(s)) {
         serverInfos = _.union(serverInfos, s);
      }
   }
 
   var htmlContents =  getValue(headers, 'resource_data');
   if (!htmlContents) {
      checkVersions(serverInfos, serverVulnerabilityMap);
      return Q.fcall(function () {
         return serverInfos;
      });
   }
 
   var analyzers = [],
      interestedDomAnalyzers = [];
 
   analyzers.push(new GeneratorTagAnalyzer());
   Iif (_.contains(fingerPrints, 'OWA')) {
      analyzers.push(new OwaAnalyzer());
   }
 
   _.forEach(analyzers, function (analyzer) {
      analyzer.init(headers);
      Eif (analyzer.isEnabledForDomWatch()) {
         interestedDomAnalyzers.push(analyzer);
      }
   });
 
   return new Q(parseHtml(htmlContents, interestedDomAnalyzers, url))
      .timeout(200)
      .then(function () {
         //We want to collect data from all analyzers
         //since some analyzers may have info just based on
         //server headers
         _.forEach(analyzers, function (analyzer) {
            serverInfos = _.union(serverInfos, analyzer.getServerInfo());
         });
 
         checkVersions(serverInfos, serverVulnerabilityMap);
         return serverInfos;
      })
      .fail (function (error) {
         logger.warn('Error parsing html contents - ' + error);
         logger.warn('Error parsing html contents - ' + error.stack);
         checkVersions(serverInfos, serverVulnerabilityMap);
         return serverInfos;
      });
};
 
var loadServerVulnerabilityMap = function (filename, lastModified) {
   logger.info('msg="loading new server vulnerability map"');
   return fs_readFile(filename, 'utf8')
      .then(function (contents) {
         var jsonStr = '';
         var lines = _s.lines(contents);
         _.forEach(lines, function (line) {
            line = _s.trim(line);
            if (_.isEmpty(line) || _s.startsWith(line, '//')) {
               return;
            }
            jsonStr += line;
         });
 
         serverVulnerabilityMap = JSON.parse(jsonStr);
         serverVulnerabilityMapLastModified = lastModified;
      });
};
 
serverDetails.checkForUpdate = function () {
   var filename = path.join(configFolder, 'vulnerable_servers_map.json');
   return fs_stat(filename)
      .then(function (stats) {
         var lastModified = stats.mtime.toISOString();
         if (lastModified === serverVulnerabilityMapLastModified) {
            return;
         }
 
         return loadServerVulnerabilityMap(filename, lastModified);
      })
      .fail(function (error) {
         logger.error('msg="Failed to load vulnerable_servers_map.json" ' +
            'stack="' + error.stack + '"');
      });
};