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lambda function for checking against DNS blocklists

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Alicia Sykes 2023-08-17 23:30:23 +01:00
parent e24934b7dd
commit 6b8c50a9aa
1 changed files with 105 additions and 0 deletions
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const dns = require('dns');
const { URL } = require('url');
const middleware = require('./_common/middleware');
const DNS_SERVERS = [
{ name: 'AdGuard', ip: '176.103.130.130' },
{ name: 'AdGuard Family', ip: '176.103.130.132' },
{ name: 'CleanBrowsing Adult', ip: '185.228.168.10' },
{ name: 'CleanBrowsing Family', ip: '185.228.168.168' },
{ name: 'CleanBrowsing Security', ip: '185.228.168.9' },
{ name: 'CloudFlare', ip: '1.1.1.1' },
{ name: 'CloudFlare Family', ip: '1.1.1.3' },
{ name: 'Comodo Secure', ip: '8.26.56.26' },
{ name: 'Google DNS', ip: '8.8.8.8' },
{ name: 'Neustar Family', ip: '156.154.70.3' },
{ name: 'Neustar Protection', ip: '156.154.70.2' },
{ name: 'Norton Family', ip: '199.85.126.20' },
{ name: 'OpenDNS', ip: '208.67.222.222' },
{ name: 'OpenDNS Family', ip: '208.67.222.123' },
{ name: 'Quad9', ip: '9.9.9.9' },
{ name: 'Yandex Family', ip: '77.88.8.7' },
{ name: 'Yandex Safe', ip: '77.88.8.88' },
];
const knownBlockIPs = [
'146.112.61.106', // OpenDNS
'185.228.168.10', // CleanBrowsing
'8.26.56.26', // Comodo
'9.9.9.9', // Quad9
'208.69.38.170', // Some OpenDNS IPs
'208.69.39.170', // Some OpenDNS IPs
'208.67.222.222', // OpenDNS
'208.67.222.123', // OpenDNS FamilyShield
'199.85.126.10', // Norton
'199.85.126.20', // Norton Family
'156.154.70.22', // Neustar
'77.88.8.7', // Yandex
'77.88.8.8', // Yandex
'::1', // Localhost IPv6
'2a02:6b8::feed:0ff', // Yandex DNS
'2a02:6b8::feed:bad', // Yandex Safe
'2a02:6b8::feed:a11', // Yandex Family
'2620:119:35::35', // OpenDNS
'2620:119:53::53', // OpenDNS FamilyShield
'2606:4700:4700::1111', // Cloudflare
'2606:4700:4700::1001', // Cloudflare
'2001:4860:4860::8888', // Google DNS
'2a0d:2a00:1::', // AdGuard
'2a0d:2a00:2::' // AdGuard Family
];
const isDomainBlocked = async (domain, serverIP) => {
return new Promise((resolve) => {
dns.resolve4(domain, { server: serverIP }, (err, addresses) => {
if (!err) {
if (addresses.some(addr => knownBlockIPs.includes(addr))) {
resolve(true);
return;
}
resolve(false);
return;
}
dns.resolve6(domain, { server: serverIP }, (err6, addresses6) => {
if (!err6) {
if (addresses6.some(addr => knownBlockIPs.includes(addr))) {
resolve(true);
return;
}
resolve(false);
return;
}
if (err6.code === 'ENOTFOUND' || err6.code === 'SERVFAIL') {
resolve(true);
} else {
resolve(false);
}
});
});
});
};
const checkDomainAgainstDnsServers = async (domain) => {
let results = [];
for (let server of DNS_SERVERS) {
const isBlocked = await isDomainBlocked(domain, server.ip);
results.push({
server: server.name,
serverIp: server.ip,
isBlocked,
});
}
return results;
};
exports.handler = middleware(async (url) => {
const domain = new URL(url).hostname;
const results = await checkDomainAgainstDnsServers(domain);
return {
statusCode: 200,
body: JSON.stringify(results)
};
});