97 lines
3.9 KiB
TypeScript
97 lines
3.9 KiB
TypeScript
// Shared auth helpers for the Nitro server (the deployed Bun server). Single-user,
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// shared-password gate: the user logs in with PUNKTFUNK_UI_PASSWORD, which sets a SEALED
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// (h3 useSession — AES-GCM) cookie; every request is gated by server/middleware/auth.ts.
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//
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// The management token never reaches the browser: server/routes/api/[...].ts injects it
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// server-side when proxying to the loopback management API.
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import {
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createHash,
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timingSafeEqual as nodeTimingSafeEqual,
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} from "node:crypto";
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import type { SessionConfig } from "h3";
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export const SESSION_NAME = "pf_session";
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/** The login password. Empty string ⇒ auth is MISCONFIGURED (the gate fails closed). */
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export function uiPassword(): string {
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return process.env.PUNKTFUNK_UI_PASSWORD ?? "";
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}
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/** The management API the proxy forwards to (loopback by default — never LAN-exposed). It serves
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* HTTPS with the host's self-signed identity cert, so the deployment also sets
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* NODE_TLS_REJECT_UNAUTHORIZED=0 for the (loopback-only) proxy fetch — see .env.example. */
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export function mgmtUrl(): string {
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return process.env.PUNKTFUNK_MGMT_URL ?? "https://127.0.0.1:47990";
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}
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/** Bearer token for the management API, injected server-side. */
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export function mgmtToken(): string {
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return process.env.PUNKTFUNK_MGMT_TOKEN ?? "";
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}
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/**
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* The cookie-sealing key for h3 `useSession` (must be ≥ 32 chars). Use PUNKTFUNK_UI_SECRET
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* if set; otherwise derive a stable 64-hex key from the password so single-var config works
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* (changing the password then invalidates existing sessions, which is fine).
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*/
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export function sessionConfig(): SessionConfig {
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const secret = process.env.PUNKTFUNK_UI_SECRET;
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const password =
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secret && secret.length >= 32
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? secret
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: createHash("sha256")
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.update(`punktfunk-session-v1:${uiPassword()}`)
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.digest("hex");
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return {
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name: SESSION_NAME,
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password,
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// Bounds a stolen/replayed cookie's lifetime (sets the cookie Max-Age AND the iron
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// seal TTL). 7 days for a single-user console.
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maxAge: 60 * 60 * 24 * 7,
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cookie: {
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httpOnly: true,
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sameSite: "lax",
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path: "/",
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// h3 defaults Secure to true, which browsers DROP over plain http:// (so login
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// silently fails on a LAN HTTP server). Only mark Secure when actually behind TLS
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// (set PUNKTFUNK_UI_SECURE=1 / =true then).
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secure: /^(1|true)$/i.test(process.env.PUNKTFUNK_UI_SECURE ?? ""),
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},
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};
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}
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/** Constant-time string comparison (avoids leaking the password via timing). */
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export function timingSafeEqual(a: string, b: string): boolean {
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const ab = Buffer.from(a);
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const bb = Buffer.from(b);
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if (ab.length !== bb.length) return false;
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return nodeTimingSafeEqual(ab, bb);
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}
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/** Paths reachable WITHOUT a session: the login page, the auth endpoints, and the build's
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* static assets (the login page needs its own CSS/JS, all of which live under /assets/).
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* Everything else — crucially ALL of /api — is gated.
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*
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* Note: do NOT allowlist by file extension. The client assets are all under /assets/, and a
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* generic `*.json` allowlist would expose `/api/v1/openapi.json` (and any future
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* `.json`/`.png` management route) through the proxy unauthenticated. */
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export function isPublicPath(pathname: string): boolean {
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if (pathname === "/api" || pathname.startsWith("/api/")) return false; // always gated
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if (pathname === "/login") return true;
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if (pathname.startsWith("/_auth/")) return true;
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if (pathname.startsWith("/assets/")) return true;
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if (pathname === "/favicon.ico" || pathname === "/robots.txt") return true;
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return false;
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}
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/** Validate a post-login redirect target: a same-origin path only. Rejects protocol-
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* relative (`//evil.com`) and absolute URLs to prevent an open redirect. */
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export function safeNextPath(next: string | undefined): string {
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if (!next || !next.startsWith("/") || next.startsWith("//")) return "/";
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return next;
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}
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export interface SessionData {
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authenticated?: boolean;
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}
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