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import type { IncomingHttpHeaders, IncomingMessage } from "node:http";
import { isIP } from "node:net";
import type { NextFunction, Request, RequestHandler, Response } from "express";
import type { VerifyClientCallbackAsync } from "ws";
export type TrustMode = "local" | "gateway";
export interface TrustConfig {
mode: TrustMode;
gatewaySecret?: string;
trustedProxy?: string;
/**
* Local mode only: the explicit UNOSIM_UNSAFE_ALLOW_EXTERNAL_LOCAL_BIND
* opt-in. Without it, local mode serves loopback clients only.
*/
allowExternalLocalClients?: true;
}
export interface RequestIdentity {
subject: string;
roles: readonly string[];
}
export type AuthorizationResult =
| { allowed: true; identity: RequestIdentity }
| { allowed: false; status: 401 | 403 };
const SUBJECT_PATTERN = /^[A-Za-z0-9._:~-]{1,128}$/;
const ALLOWED_ROLES = new Set(["user"]);
const LOCAL_SESSION_COOKIE = "unosim_local_session";
const LOCAL_SESSION_MAX_AGE_SECONDS = 24 * 60 * 60;
const localSessionSigningKey = randomBytes(32);
const requestIdentity = new WeakMap<IncomingMessage, RequestIdentity>();
function parseCookies(header: string | undefined): Map<string, string> {
const cookies = new Map<string, string>();
for (const part of header?.split(";") ?? []) {
const separator = part.indexOf("=");
Iif (separator < 1) continue;
const name = part.slice(0, separator).trim();
const value = part.slice(separator + 1).trim();
cookies.set(name, value);
}
return cookies;
}
function signLocalSession(id: string): string {
return createHmac("sha256", localSessionSigningKey)
.update(id)
.digest("base64url");
}
function readLocalSession(headers: IncomingHttpHeaders): string | undefined {
const token = parseCookies(singleHeader(headers, "cookie")).get(
LOCAL_SESSION_COOKIE,
);
if (!token) return undefined;
const separator = token.indexOf(".");
Iif (separator < 1) return undefined;
const id = token.slice(0, separator);
const signature = token.slice(separator + 1);
Iif (!/^[A-Za-z0-9_-]{22}$/.test(id)) return undefined;
return secretsEqual(signature, signLocalSession(id)) ? id : undefined;
}
function createLocalIdentity(): {
identity: RequestIdentity;
cookie: string;
} {
const id = randomBytes(16).toString("base64url");
const token = `${id}.${signLocalSession(id)}`;
return {
identity: { subject: `local.${id}`, roles: ["user"] },
cookie: `${LOCAL_SESSION_COOKIE}=${token}; Path=/; HttpOnly; SameSite=Strict; Max-Age=${LOCAL_SESSION_MAX_AGE_SECONDS}`,
};
}
function resolveRequestAuthorization(
req: IncomingMessage,
trust: TrustConfig,
): AuthorizationResult & { cookie?: string } {
const existing = requestIdentity.get(req);
if (existing) return { allowed: true, identity: existing };
if (trust.mode === "gateway") {
const authorization = authorizeHeaders(req.headers, trust);
if (authorization.allowed) requestIdentity.set(req, authorization.identity);
return authorization;
}
const sessionId = readLocalSession(req.headers);
const resolved: { identity: RequestIdentity; cookie?: string } = sessionId
? { identity: { subject: `local.${sessionId}`, roles: ["user"] } }
: createLocalIdentity();
requestIdentity.set(req, resolved.identity);
return { allowed: true, identity: resolved.identity, cookie: resolved.cookie };
}
function isIpOrCidr(value: string): boolean {
const [address, prefix, ...rest] = value.split("/");
Iif (rest.length > 0 || !address) return false;
const version = isIP(address);
if (version === 0) return false;
Iif (prefix === undefined) return true;
Iif (!/^\d+$/.test(prefix)) return false;
const bits = Number(prefix);
return bits >= 0 && bits <= (version === 4 ? 32 : 128);
}
export function parseTrustConfig(
env: NodeJS.ProcessEnv,
profile: {
serverMode: "local" | "docker";
dockerTestBypassGateway: boolean;
},
allowUnsafeExternalLocalBind = false,
): TrustConfig {
if (profile.serverMode === "local") {
return allowUnsafeExternalLocalBind
? { mode: "local", allowExternalLocalClients: true }
: { mode: "local" };
}
if (profile.dockerTestBypassGateway) {
return { mode: "local" };
}
const gatewaySecret = env.UNOSIM_GATEWAY_SECRET;
if (!gatewaySecret || gatewaySecret.length < 32) {
throw new Error(
"UNOSIM_GATEWAY_SECRET must contain at least 32 characters in gateway mode",
);
}
const trustedProxy = env.UNOSIM_TRUSTED_PROXY?.trim();
if (!trustedProxy || !isIpOrCidr(trustedProxy)) {
throw new Error(
"UNOSIM_TRUSTED_PROXY must be an explicit IP address or CIDR in gateway mode",
);
}
return { mode: "gateway", gatewaySecret, trustedProxy };
}
function singleHeader(
headers: IncomingHttpHeaders,
name: string,
): string | undefined {
const value = headers[name];
return Array.isArray(value) ? undefined : value;
}
function isLoopbackAddress(address: string | undefined): boolean {
if (!address) return false;
const normalized = address.startsWith("::ffff:") ? address.slice("::ffff:".length) : address;
const version = isIP(normalized);
if (version === 6) return normalized === "::1";
return version === 4 && normalized.split(".", 1)[0] === "127";
}
/**
* Whether a Host header names this machine: `localhost` or a numeric loopback
* address, with any port. A DNS rebinding page reaches a loopback listener
* under its own host name, and a LAN client under the machine's LAN address;
* both fail here.
*/
export function isLoopbackHostHeader(host: string | undefined): boolean {
// A Host header is host[:port]; anything URL syntax would reinterpret is refused.
if (!host || /[\s/\\@?#]/.test(host)) return false;
let hostname: string;
try {
hostname = new URL(`http://${host}`).hostname;
} catch {
return false;
}
if (hostname === "localhost") return true;
if (hostname === "[::1]") return true;
return isIP(hostname) === 4 && isLoopbackAddress(hostname);
}
/**
* Local mode runs sketches as native processes, so only this machine may use it.
* Gateway mode and the explicit unsafe external opt-in are not restricted here.
*/
export function isLocalClientAllowed(req: IncomingMessage, trust: TrustConfig): boolean {
if (trust.mode !== "local" || trust.allowExternalLocalClients) return true;
return isLoopbackHostHeader(singleHeader(req.headers, "host"));
}
/** Rejects HTTP requests for a non-loopback host in local mode (LAN, DNS rebinding). */
export function createLocalHostGuard(trust: TrustConfig): RequestHandler {
return (req: Request, res: Response, next: NextFunction): void => {
if (!isLocalClientAllowed(req, trust)) {
res.status(403).json({ error: "Local mode accepts only localhost requests" });
return;
}
next();
};
}
export function isWebSocketOriginAllowed(
headers: IncomingHttpHeaders,
trust: TrustConfig,
allowedOrigins: readonly string[],
remoteAddress?: string,
): boolean {
const origin = singleHeader(headers, "origin");
if (!origin) {
// Non-browser clients send no Origin; locally only this machine may connect without one.
return trust.mode === "local"
&& (trust.allowExternalLocalClients === true || isLoopbackAddress(remoteAddress));
}
let parsed: URL;
try {
parsed = new URL(origin);
if (
parsed.origin !== origin ||
!["http:", "https:"].includes(parsed.protocol)
) {
return false;
}
} catch {
return false;
}
if (trust.mode === "local" && singleHeader(headers, "host") === parsed.host) {
return true;
}
return allowedOrigins.includes(origin);
}
function secretsEqual(actual: string | undefined, expected: string): boolean {
if (!actual) return false;
const actualDigest = createHash("sha256").update(actual).digest();
const expectedDigest = createHash("sha256").update(expected).digest();
return timingSafeEqual(actualDigest, expectedDigest);
}
export function authorizeHeaders(
headers: IncomingHttpHeaders,
trust: TrustConfig,
): AuthorizationResult {
if (trust.mode === "local") {
return { allowed: true, identity: { subject: "local", roles: ["user"] } };
}
if (
!secretsEqual(
singleHeader(headers, "x-unosim-gateway-secret"),
trust.gatewaySecret!,
)
) {
return { allowed: false, status: 401 };
}
const subject = singleHeader(headers, "x-unosim-subject");
if (!subject || !SUBJECT_PATTERN.test(subject)) {
return { allowed: false, status: 401 };
}
const rolesHeader = singleHeader(headers, "x-unosim-roles");
Iif (!rolesHeader) return { allowed: false, status: 403 };
const roles = rolesHeader
.split(",")
.map((role) => role.trim())
.filter(Boolean);
if (
!roles.includes("user") ||
roles.some((role) => !ALLOWED_ROLES.has(role))
) {
return { allowed: false, status: 403 };
}
return { allowed: true, identity: { subject, roles } };
}
export function createUserAuthorizationMiddleware(
trust: TrustConfig,
): RequestHandler {
return (req: Request, res: Response, next: NextFunction): void => {
const result = resolveRequestAuthorization(req, trust);
if (!result.allowed) {
res
.status(result.status)
.json({ error: result.status === 401 ? "Unauthorized" : "Forbidden" });
return;
}
res.locals.unosimIdentity = result.identity;
if (result.cookie) res.appendHeader("Set-Cookie", result.cookie);
next();
};
}
/**
* Issues a server-authenticated local session before static/API requests. This
* keeps browser clients independent without trusting a client-provided user ID.
* Gateway mode remains entirely governed by the gateway contract.
*/
export function createLocalSessionMiddleware(trust: TrustConfig): RequestHandler {
return (req: Request, res: Response, next: NextFunction): void => {
if (trust.mode === "local") {
const result = resolveRequestAuthorization(req, trust);
if (result.allowed) {
res.locals.unosimIdentity = result.identity;
if (result.cookie) res.appendHeader("Set-Cookie", result.cookie);
}
}
next();
};
}
export function getRequestAuthorization(
req: IncomingMessage,
trust: TrustConfig,
): AuthorizationResult {
return resolveRequestAuthorization(req, trust);
}
export function createWebSocketAuthorizationVerifier(
trust: TrustConfig,
allowedOrigins: readonly string[],
): VerifyClientCallbackAsync {
return ({ req }, done) => {
const result = resolveRequestAuthorization(req, trust);
if (!result.allowed) {
done(
false,
result.status,
result.status === 401 ? "Unauthorized" : "Forbidden",
);
return;
}
if (!isLocalClientAllowed(req, trust)) {
done(false, 403, "Forbidden host");
return;
}
if (!isWebSocketOriginAllowed(req.headers, trust, allowedOrigins, req.socket?.remoteAddress)) {
done(false, 403, "Forbidden origin");
return;
}
if (result.cookie) {
done(true, undefined, undefined, { "Set-Cookie": result.cookie });
return;
}
done(true);
};
}
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