/
blacklist.js
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/
blacklist.js
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'use strict';
var ipaddr = require('ipaddr.js');
var winston = require('winston');
var async = require('async');
var db = require('../database');
var pubsub = require('../pubsub');
var plugins = require('../plugins');
var analytics = require('../analytics');
var Blacklist = {
_rules: [],
};
Blacklist.load = function (callback) {
callback = callback || function () {};
async.waterfall([
Blacklist.get,
Blacklist.validate,
function (rules, next) {
winston.verbose('[meta/blacklist] Loading ' + rules.valid.length + ' blacklist rule(s)' + (rules.duplicateCount > 0 ? ', ignored ' + rules.duplicateCount + ' duplicate(s)' : ''));
if (rules.invalid.length) {
winston.warn('[meta/blacklist] ' + rules.invalid.length + ' invalid blacklist rule(s) were ignored.');
}
Blacklist._rules = {
ipv4: rules.ipv4,
ipv6: rules.ipv6,
cidr: rules.cidr,
cidr6: rules.cidr6,
};
next();
},
], callback);
};
pubsub.on('blacklist:reload', Blacklist.load);
Blacklist.save = function (rules, callback) {
async.waterfall([
function (next) {
db.setObject('ip-blacklist-rules', { rules: rules }, next);
},
function (next) {
Blacklist.load(next);
pubsub.publish('blacklist:reload');
},
], callback);
};
Blacklist.get = function (callback) {
async.waterfall([
function (next) {
db.getObject('ip-blacklist-rules', next);
},
function (data, next) {
next(null, data && data.rules);
},
], callback);
};
Blacklist.test = function (clientIp, callback) {
// Some handy test addresses
// clientIp = '2001:db8:85a3:0:0:8a2e:370:7334'; // IPv6
// clientIp = '127.0.15.1'; // IPv4
// clientIp = '127.0.15.1:3443'; // IPv4 with port strip port to not fail
clientIp = clientIp.split(':').length === 2 ? clientIp.split(':')[0] : clientIp;
var addr = ipaddr.parse(clientIp);
if (
Blacklist._rules.ipv4.indexOf(clientIp) === -1 && // not explicitly specified in ipv4 list
Blacklist._rules.ipv6.indexOf(clientIp) === -1 && // not explicitly specified in ipv6 list
!Blacklist._rules.cidr.some(function (subnet) {
var cidr = ipaddr.parseCIDR(subnet);
if (addr.kind() !== cidr[0].kind()) {
return false;
}
return addr.match(cidr);
}) // not in a blacklisted IPv4 or IPv6 cidr range
) {
plugins.fireHook('filter:blacklist.test', { // To return test failure, pass back an error in callback
ip: clientIp,
}, function (err) {
if (err) {
analytics.increment('blacklist');
}
if (typeof callback === 'function') {
callback(err);
} else {
return !!err;
}
});
} else {
var err = new Error('[[error:blacklisted-ip]]');
err.code = 'blacklisted-ip';
analytics.increment('blacklist');
if (typeof callback === 'function') {
setImmediate(callback, err);
} else {
return true;
}
}
};
Blacklist.validate = function (rules, callback) {
rules = (rules || '').split('\n');
var ipv4 = [];
var ipv6 = [];
var cidr = [];
var invalid = [];
var duplicateCount = 0;
var inlineCommentMatch = /#.*$/;
var whitelist = ['127.0.0.1', '::1', '::ffff:0:127.0.0.1'];
// Filter out blank lines and lines starting with the hash character (comments)
// Also trim inputs and remove inline comments
rules = rules.map(function (rule) {
rule = rule.replace(inlineCommentMatch, '').trim();
return rule.length && !rule.startsWith('#') ? rule : null;
}).filter(Boolean);
// Filter out duplicates
rules = rules.filter(function (rule, index) {
const pass = rules.indexOf(rule) === index;
if (!pass) {
duplicateCount += 1;
}
return pass;
});
// Filter out invalid rules
rules = rules.filter(function (rule) {
var addr;
var isRange = false;
try {
addr = ipaddr.parse(rule);
} catch (e) {
// Do nothing
}
try {
addr = ipaddr.parseCIDR(rule);
isRange = true;
} catch (e) {
// Do nothing
}
if (!addr || whitelist.indexOf(rule) !== -1) {
invalid.push(rule);
return false;
}
if (!isRange) {
if (addr.kind() === 'ipv4' && ipaddr.IPv4.isValid(rule)) {
ipv4.push(rule);
return true;
}
if (addr.kind() === 'ipv6' && ipaddr.IPv6.isValid(rule)) {
ipv6.push(rule);
return true;
}
} else {
cidr.push(rule);
return true;
}
return false;
});
callback(null, {
numRules: rules.length + invalid.length,
ipv4: ipv4,
ipv6: ipv6,
cidr: cidr,
valid: rules,
invalid: invalid,
duplicateCount: duplicateCount,
});
};
module.exports = Blacklist;