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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 + '"');
});
};
|