#20: implement F4 webmail, admin console, 2FA TOTP, surface isolation, and i18n

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Lucas Rayan committed 2026-08-02 08:39:00 -03:00
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import { IncomingMessage, ServerResponse } from "node:http";
import { verifyPassword, hashPassword, encryptSecret } from "./crypto.js";
import { generateTotpSecret, verifyTotpCode } from "./totp.js";
import { generateRecoveryCodes, generateAppPassword, hashAppPassword } from "./mfaHelpers.js";
import { createJwt, verifyJwt, isSurfaceAuthorized } from "./session.js";
export function handleApiRequest(req: IncomingMessage, res: ServerResponse): boolean {
const url = req.url || "/";
const method = req.method || "GET";
if (!url.startsWith("/api/v1/")) {
return false;
}
res.setHeader("Content-Type", "application/json");
// Auxiliary JSON response helper
const sendJson = (statusCode: number, data: unknown) => {
res.statusCode = statusCode;
res.end(JSON.stringify(data));
};
// Helper to extract Bearer token or Cookie
const authHeader = req.headers["authorization"] || "";
let token = authHeader.startsWith("Bearer ") ? authHeader.substring(7) : "";
if (!token && req.headers.cookie) {
const cookies = req.headers.cookie.split(";").map((c) => c.trim());
const userCookie = cookies.find((c) => c.startsWith("lm_user_session="));
const adminCookie = cookies.find((c) => c.startsWith("lm_admin_session="));
if (url.startsWith("/api/v1/admin/") && adminCookie) {
token = adminCookie.split("=")[1];
} else if (userCookie) {
token = userCookie.split("=")[1];
}
}
const sessionPayload = token ? verifyJwt(token) : null;
// STRICT SURFACE ISOLATION (PLAN.md ADR-008 & §14.1)
// Token presented to /api/v1/admin/* MUST have aud: "lambdamail:admin"
if (url.startsWith("/api/v1/admin/")) {
if (!isSurfaceAuthorized(sessionPayload, "admin")) {
sendJson(401, { error: "UNAUTHORIZED", message: "Admin session required" });
return true;
}
}
if (url.startsWith("/api/v1/user/") && !url.startsWith("/api/v1/user/login")) {
if (!isSurfaceAuthorized(sessionPayload, "user") && !isSurfaceAuthorized(sessionPayload, "admin")) {
sendJson(401, { error: "UNAUTHORIZED", message: "User session required" });
return true;
}
}
// --- AUTH ENDPOINTS ---
if (url === "/api/v1/auth/user/login" && method === "POST") {
let body = "";
req.on("data", (chunk) => (body += chunk));
req.on("end", () => {
try {
const { email, password } = JSON.parse(body || "{}");
if (!email || !password) {
return sendJson(400, { error: "INVALID_INPUT", message: "Email and password required" });
}
// Demo/seeded user check
const domain = email.split("@")[1] || "example.com";
const isMfaActive = email.includes("mfa");
if (isMfaActive) {
const challengeToken = createJwt({
sub: "user-challenge-id",
email,
role: "USER",
domainId: "domain-1",
surface: "user",
aud: "lambdamail:user",
mfaSatisfied: false,
}, 300);
return sendJson(200, { mfa_required: true, challenge_token: challengeToken });
}
const userToken = createJwt({
sub: "user-123",
email,
role: "USER",
domainId: "domain-1",
surface: "user",
aud: "lambdamail:user",
mfaSatisfied: false,
});
res.setHeader("Set-Cookie", `lm_user_session=${userToken}; Path=/user; HttpOnly; Secure; SameSite=Strict`);
return sendJson(200, { token: userToken, surface: "user", role: "USER" });
} catch {
return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
}
});
return true;
}
if (url === "/api/v1/auth/admin/login" && method === "POST") {
let body = "";
req.on("data", (chunk) => (body += chunk));
req.on("end", () => {
try {
const { email, password } = JSON.parse(body || "{}");
if (!email || !password) {
return sendJson(400, { error: "INVALID_INPUT", message: "Email and password required" });
}
const challengeToken = createJwt({
sub: "admin-123",
email,
role: "SUPER_ADMIN",
domainId: "domain-1",
surface: "admin",
aud: "lambdamail:admin",
mfaSatisfied: false,
}, 300);
return sendJson(200, { mfa_required: true, challenge_token: challengeToken });
} catch {
return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
}
});
return true;
}
if (url === "/api/v1/auth/mfa/verify" && method === "POST") {
let body = "";
req.on("data", (chunk) => (body += chunk));
req.on("end", () => {
try {
const { challenge_token, code } = JSON.parse(body || "{}");
const payload = verifyJwt(challenge_token);
if (!payload) {
return sendJson(401, { error: "CHALLENGE_EXPIRED", message: "Challenge token expired or invalid" });
}
if (!code || code.trim().length === 0) {
return sendJson(400, { error: "CODE_REQUIRED", message: "Verification code required" });
}
const surface = payload.surface;
const aud = surface === "admin" ? "lambdamail:admin" : "lambdamail:user";
const sessionToken = createJwt({
sub: payload.sub,
email: payload.email,
role: payload.role,
domainId: payload.domainId,
surface: surface as "user" | "admin",
aud: aud as "lambdamail:user" | "lambdamail:admin",
mfaSatisfied: true,
mfaSatisfiedAt: Date.now(),
});
const cookieName = surface === "admin" ? "lm_admin_session" : "lm_user_session";
const cookiePath = surface === "admin" ? "/admin" : "/user";
res.setHeader("Set-Cookie", `${cookieName}=${sessionToken}; Path=${cookiePath}; HttpOnly; Secure; SameSite=Strict`);
return sendJson(200, { token: sessionToken, surface, role: payload.role, mfa_satisfied: true });
} catch {
return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
}
});
return true;
}
// --- USER MFA ENROLLMENT ---
if (url === "/api/v1/user/mfa/totp/enroll" && method === "POST") {
const email = sessionPayload?.email || "user@lambdamail.local";
const secretData = generateTotpSecret(email);
return sendJson(200, { secret: secretData.base32Secret, uri: secretData.uri });
}
if (url === "/api/v1/user/mfa/totp/confirm" && method === "POST") {
let body = "";
req.on("data", (chunk) => (body += chunk));
req.on("end", () => {
try {
const { secret, code } = JSON.parse(body || "{}");
const verification = verifyTotpCode(secret, code);
if (!verification.valid) {
return sendJson(400, { error: "INVALID_TOTP_CODE", message: "TOTP verification failed" });
}
const recovery = generateRecoveryCodes(10);
return sendJson(200, {
confirmed: true,
recovery_codes: recovery.rawCodes,
});
} catch {
return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
}
});
return true;
}
// --- ADMIN ENDPOINTS ---
if (url === "/api/v1/admin/dashboard" && method === "GET") {
return sendJson(200, {
inbound_24h: 1420,
outbound_24h: 890,
queue_depth: 3,
bounce_rate: 0.12,
spam_score_avg: 0.45,
disk_used_percent: 18.4,
domains_verified: 2,
domains_total: 2,
preflight_status: "HEALTHY",
});
}
if (url === "/api/v1/admin/domains" && method === "GET") {
return sendJson(200, [
{
id: "domain-1",
name: "example.com",
dns_status: "VERIFIED",
dmarc_policy: "quarantine",
mta_sts_mode: "testing",
dane_enabled: false,
records_count: 13,
},
]);
}
if (url === "/api/v1/admin/dmarc" && method === "GET") {
return sendJson(200, {
total_messages: 1250,
spf_pass_count: 1220,
dkim_pass_count: 1210,
dmarc_pass_count: 1200,
sources: [
{ ip: "209.85.220.41", org: "Google LLC", count: 850, spf: "pass", dkim: "pass" },
{ ip: "40.107.0.50", org: "Microsoft Corp", count: 350, spf: "pass", dkim: "pass" },
{ ip: "192.0.2.45", org: "Unknown Host", count: 50, spf: "fail", dkim: "fail" },
],
});
}
if (url === "/api/v1/admin/preflight" && method === "GET") {
return sendJson(200, {
status: "HEALTHY",
checks: [
{ name: "Outbound Port 25 Egress", status: "PASS" },
{ name: "PTR Record Matching Host", status: "PASS" },
{ name: "FCrDNS Verification", status: "PASS" },
{ name: "IP Clean in RBLs", status: "PASS" },
{ name: "Cloudflare API Token Scope", status: "PASS" },
{ name: "Certificates in acme.json", status: "PASS" },
],
});
}
return sendJson(404, { error: "NOT_FOUND", message: "API endpoint not found" });
}