File size: 3,493 Bytes
c92aa92 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | import { isIP } from 'node:net';
const MAX_UNSIGNED_INT32 = 0xffffffff;
function parseIpv4(ip: string): number[] | null {
const parts = ip.split('.');
if (parts.length !== 4) {
return null;
}
const values: number[] = [];
for (const part of parts) {
if (!/^\d+$/.test(part)) {
return null;
}
const value = Number(part);
if (!Number.isInteger(value) || value < 0 || value > 255) {
return null;
}
values.push(value);
}
return values;
}
function parseIntegerIpv4Literal(hostname: string): string | null {
if (!/^\d+$/.test(hostname)) {
return null;
}
const value = Number(hostname);
if (!Number.isInteger(value) || value < 0 || value > MAX_UNSIGNED_INT32) {
return null;
}
const a = (value >>> 24) & 255;
const b = (value >>> 16) & 255;
const c = (value >>> 8) & 255;
const d = value & 255;
return `${a}.${b}.${c}.${d}`;
}
function isPrivateIpv4(ip: string): boolean {
const parts = parseIpv4(ip);
if (!parts) {
return false;
}
const [a, b] = parts;
return (
a === 10 ||
a === 127 ||
a === 0 ||
(a === 100 && b >= 64 && b <= 127) ||
(a === 169 && b === 254) ||
(a === 172 && b >= 16 && b <= 31) ||
(a === 192 && b === 168) ||
(a === 198 && (b === 18 || b === 19))
);
}
function isPrivateIpv6(ip: string): boolean {
const normalized = ip.toLowerCase();
if (normalized === '::1' || normalized === '::') {
return true;
}
if (normalized.startsWith('::ffff:')) {
const mapped = normalized.slice('::ffff:'.length);
return isPrivateIpv4(mapped);
}
if (/^(fc|fd)/.test(normalized)) {
return true;
}
if (/^fe[89ab]/.test(normalized)) {
return true;
}
return false;
}
function isPrivateOrLocalIp(ip: string): boolean {
const version = isIP(ip);
if (version === 4) {
return isPrivateIpv4(ip);
}
if (version === 6) {
return isPrivateIpv6(ip);
}
return false;
}
export function isPrivateOrLocalHostname(hostname: string): boolean {
const host = hostname.trim().toLowerCase();
if (!host) {
return true;
}
if (host === 'localhost' || host.endsWith('.localhost')) {
return true;
}
if (host === 'metadata.google.internal' || host === 'metadata.azure.internal') {
return true;
}
const integerIp = parseIntegerIpv4Literal(host);
if (integerIp && isPrivateIpv4(integerIp)) {
return true;
}
if (isPrivateOrLocalIp(host)) {
return true;
}
return false;
}
export function isPublicHttpUrl(url: string): boolean {
try {
const parsed = new URL(url);
if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
return false;
}
return !isPrivateOrLocalHostname(parsed.hostname);
} catch {
return false;
}
}
export function assertPublicHttpUrl(url: string | URL, label: string = 'URL'): void {
const parsed = typeof url === 'string' ? new URL(url) : url;
if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
throw new Error(`${label} must use HTTP or HTTPS`);
}
if (isPrivateOrLocalHostname(parsed.hostname)) {
throw new Error(`${label} points to a private or local network target, which is not allowed`);
}
}
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