passkey.ts

1import { isProUser } from "./license";2import * as vault from "./vault";3import {4  base64urlDecode,5  base64urlEncode,6  buildAuthenticatorData,7  buildClientDataJSON,8  createAttestationObject,9  generateCredentialId,10  generatePasskeyKeypair,11  pickPasskeyAlgorithm,12  signPasskeyAssertion,13} from "./passkey-crypto";14import { detectBrowser as detectSharedBrowser, firefoxVersion } from "../shared/browser";15import { FIREFOX_USE_CONTENT_SCRIPT_PROXY } from "../shared/passkey-flags";16import type {17  PasskeyData,18  PasskeyProviderState,19  PendingPasskeyRequest,20  VaultEntry,21} from "../shared/types";2223declare const __PEACH_E2E_PASSKEYS__: boolean;2425const PENDING_PREFIX = "passkey_pending_";26const APPROVAL_TIMEOUT_MS = 60_000;2728let listenersRegistered = false;29let attached = false;30let conflict: string | undefined;31const PASSKEY_CREATE_E2E_BYPASS = __PEACH_E2E_PASSKEYS__ === true;3233const approvals = new Map<34  number,35  { resolve: (approved: boolean) => void; timeoutId: ReturnType<typeof setTimeout> }36>();3738function isPasskeySupported(): boolean {39  if (typeof chrome.webAuthenticationProxy?.attach === "function") return true;40  // Firefox 150+ exposes navigator.credentials.create/get from the popup41  // context with extension host permissions. Cannot intercept page-side42  // calls (no equivalent of webAuthenticationProxy), but registration via43  // Peach's own popup-driven flow works.44  if (detectSharedBrowser() === "firefox") {45    const ver = firefoxVersion();46    if (Number.isFinite(ver) && ver >= 150) return true;47  }48  return false;49}5051export const detectBrowser = detectSharedBrowser;5253function getBrowserLabel(): string {54  const ua = navigator.userAgent;55  if (/Firefox\/(\d+)/.test(ua)) {56    const version = ua.match(/Firefox\/(\d+)/)?.[1];57    return version ? `Firefox ${version}` : "Firefox";58  }59  const version = ua.match(/Chrome\/(\d+)/)?.[1];60  return version ? `Chrome ${version}` : "Chromium";61}6263function pendingStorageKey(requestId: number): string {64  return `${PENDING_PREFIX}${requestId}`;65}6667function originFromRpId(rpId: string): string {68  return /^(localhost|127\.0\.0\.1|\[::1\])$/i.test(rpId)69    ? `http://${rpId}`70    : `https://${rpId}`;71}7273async function setBadge(text: string): Promise<void> {74  if (!chrome.action?.setBadgeText) return;75  await chrome.action.setBadgeText({ text });76  if (text) {77    await chrome.action.setBadgeBackgroundColor({ color: "#D96830" });78  }79}8081async function clearPendingRequest(requestId: number): Promise<void> {82  if (chrome.storage.session) {83    await chrome.storage.session.remove(pendingStorageKey(requestId));84  }85  await setBadge("");86}8788async function openApprovalPopup(): Promise<void> {89  try {90    await chrome.action.openPopup();91  } catch {92    await setBadge("PK");93  }94}9596async function rejectCreate(97  requestId: number,98  name: string,99  message = ""100): Promise<void> {101  await chrome.webAuthenticationProxy.completeCreateRequest({102    requestId,103    error: { name, message },104  });105}106107async function rejectGet(108  requestId: number,109  name: string,110  message = ""111): Promise<void> {112  await chrome.webAuthenticationProxy.completeGetRequest({113    requestId,114    error: { name, message },115  });116}117118export async function getPendingPasskeyRequest(): Promise<PendingPasskeyRequest | null> {119  if (!chrome.storage.session) return null; // Firefox <132 / unsupported contexts120  const stored = (await chrome.storage.session.get(null)) as Record<string, unknown>;121  const key = Object.keys(stored).find((item) => item.startsWith(PENDING_PREFIX));122  if (!key) return null;123  const pending = stored[key];124  return pending && typeof pending === "object"125    ? (pending as PendingPasskeyRequest)126    : null;127}128129export async function resolvePendingPasskeyRequest(130  requestId: number,131  approved: boolean132): Promise<void> {133  const pending = approvals.get(requestId);134  if (!pending) {135    // Either the request expired (Chrome) or this is a Firefox-driven136    // pending where the popup performs the navigator.credentials call137    // directly. Clear both possible session keys so getPendingPasskeyRequest()138    // doesn't surface stale state on the next popup open.139    await clearPendingRequest(requestId);140    if (chrome.storage.session) {141      await chrome.storage.session.remove(FIREFOX_PENDING_KEY);142    }143    return;144  }145146  clearTimeout(pending.timeoutId);147  approvals.delete(requestId);148  await clearPendingRequest(requestId);149  pending.resolve(approved);150}151152async function promptUserApproval(request: PendingPasskeyRequest): Promise<boolean> {153  if (chrome.storage.session) {154    await chrome.storage.session.set({ [pendingStorageKey(request.requestId)]: request });155  }156  await openApprovalPopup();157158  return new Promise<boolean>((resolve) => {159    const timeoutId = setTimeout(async () => {160      approvals.delete(request.requestId);161      await clearPendingRequest(request.requestId);162      resolve(false);163    }, APPROVAL_TIMEOUT_MS);164165    approvals.set(request.requestId, { resolve, timeoutId });166  });167}168169export async function getPasskeyProviderState(): Promise<PasskeyProviderState> {170  const settings = await vault.ensureSettingsLoaded();171  const supported = isPasskeySupported();172  const enabled = settings.passkeyProviderEnabled === true;173  return {174    supported,175    enabled,176    attached: supported && attached,177    browserLabel: getBrowserLabel(),178    statusLabel: !supported179      ? "Interception unavailable"180      : attached181        ? "Active"182        : conflict183          ? "Another provider is active"184          : enabled185            ? "Inactive"186            : "Disabled",187    conflict,188  };189}190191async function attachPasskeyProxy(): Promise<void> {192  if (!isPasskeySupported()) {193    attached = false;194    conflict = "This browser does not expose chrome.webAuthenticationProxy.";195    return;196  }197198  // Firefox path: no chrome.webAuthenticationProxy exists. The popup-context199  // navigator.credentials creator is always ready once the user enables the200  // provider. Treat enabled = attached for state reporting purposes.201  if (detectSharedBrowser() === "firefox") {202    attached = true;203    conflict = undefined;204    return;205  }206207  if (attached) return;208209  try {210    await chrome.webAuthenticationProxy.attach();211    attached = true;212    conflict = undefined;213  } catch (error) {214    attached = false;215    conflict = error instanceof Error ? error.message : "Another provider is active.";216  }217}218219async function detachPasskeyProxy(): Promise<void> {220  if (!isPasskeySupported()) {221    attached = false;222    return;223  }224225  if (detectSharedBrowser() === "firefox") {226    attached = false;227    conflict = undefined;228    return;229  }230231  try {232    await chrome.webAuthenticationProxy.detach();233  } catch {234    // Ignore detach failures; the extension may already be detached.235  }236237  attached = false;238  conflict = undefined;239}240241export async function setPasskeyProviderEnabled(enabled: boolean): Promise<PasskeyProviderState> {242  await vault.updateSettings({ passkeyProviderEnabled: enabled });243  if (enabled) {244    await attachPasskeyProxy();245  } else {246    await detachPasskeyProxy();247  }248  return getPasskeyProviderState();249}250251async function refreshPasskeyProxy(): Promise<void> {252  const settings = await vault.ensureSettingsLoaded();253  if (settings.passkeyProviderEnabled === true) {254    await attachPasskeyProxy();255    return;256  }257  await detachPasskeyProxy();258}259260/**261 * Find the entry that already holds a passkey for the given RP, or the most262 * recently-modified login entry whose URL/additionalUrls match the RP — that263 * entry is the natural attach target when the user adds a passkey to a site264 * they already have a password for. Returns null when there's no candidate;265 * the caller creates a new entry in that case.266 */267function findAttachTarget(rpId: string): VaultEntry | null {268  const all = vault.getEntries();269  const passkeyMatch = all.find(270    (entry) => entry.passkey?.rpId === rpId && !entry.deletedAt271  );272  if (passkeyMatch) return passkeyMatch;273  const loginMatches = vault.queryDomain(rpId).filter((entry) => entry.type === "login" && !entry.passkey);274  if (loginMatches.length === 0) return null;275  // Pick the most recently modified candidate to be deterministic.276  return loginMatches.reduce((best, e) =>277    (e.modifiedAt ?? 0) > (best.modifiedAt ?? 0) ? e : best278  );279}280281async function handleCreateRequest(282  request: chrome.webAuthenticationProxy.CreateRequest283): Promise<void> {284  const options = JSON.parse(request.requestDetailsJson) as PublicKeyCredentialCreationOptionsJSON;285  const rpId = options.rp.id;286  const rpName = options.rp.name ?? options.rp.id;287  const userName = options.user.name;288  const userDisplayName = options.user.displayName ?? options.user.name;289290  if (!rpId) {291    await rejectCreate(request.requestId, "NotSupportedError", "Missing RP ID");292    return;293  }294295  if (!PASSKEY_CREATE_E2E_BYPASS && !(await isProUser())) {296    await rejectCreate(297      request.requestId,298      "NotAllowedError",299      "Passkey creation requires Peach Pro."300    );301    // Show the inline passkey gate so the user knows what happened and can upgrade.302    broadcastPasskeyProGate();303    return;304  }305306  if (!vault.isUnlocked()) {307    await openApprovalPopup();308    await rejectCreate(request.requestId, "NotAllowedError", "Unlock Peach first.");309    return;310  }311312  const approved = await promptUserApproval({313    requestId: request.requestId,314    type: "create",315    rpId,316    rpName,317    userName,318    userDisplayName,319  });320  if (!approved) {321    await rejectCreate(request.requestId, "NotAllowedError", "User denied request.");322    return;323  }324325  const algorithm = pickPasskeyAlgorithm(options.pubKeyCredParams ?? []);326  if (!algorithm) {327    await rejectCreate(request.requestId, "NotSupportedError", "No supported algorithm offered.");328    return;329  }330331  const credentialIdBytes = crypto.getRandomValues(new Uint8Array(32));332  const { publicKeyCose, publicKeySpki, privateKeyJwk } = await generatePasskeyKeypair(333    algorithm334  );335  const authData = await buildAuthenticatorData({336    rpId,337    flags: 0x4d,338    signCount: 0,339    credentialId: credentialIdBytes,340    publicKeyCose,341  });342  const attestationObject = createAttestationObject(authData);343  const clientDataJSON = buildClientDataJSON("webauthn.create", options.challenge, originFromRpId(rpId));344345  const passkey: PasskeyData = {346    rpId,347    rpName,348    credentialId: base64urlEncode(credentialIdBytes),349    publicKeyCose: base64urlEncode(publicKeyCose),350    privateKeyJwk,351    userHandle: options.user.id,352    userName,353    userDisplayName,354    algorithm,355    signCount: 0,356    aaguid: base64urlEncode(new Uint8Array(16)),357    backupEligible: false,358    backupState: false,359    browser: "chrome",360    transports: ["internal"],361    createdAt: Date.now(),362  };363364  // Attach to an existing login (same domain) when one exists; otherwise365  // create a fresh login entry that exists solely to hold the passkey.366  const target = findAttachTarget(rpId);367  if (target) {368    await vault.updateEntry(target.id, { passkey });369  } else {370    await vault.addEntry({371      type: "login",372      title: rpName,373      url: `https://${rpId}`,374      username: userName,375      passkey,376    });377  }378379  await chrome.webAuthenticationProxy.completeCreateRequest({380    requestId: request.requestId,381    responseJson: JSON.stringify({382      id: passkey.credentialId,383      rawId: passkey.credentialId,384      type: "public-key",385      response: {386        clientDataJSON: base64urlEncode(clientDataJSON),387        authenticatorData: base64urlEncode(authData),388        attestationObject: base64urlEncode(attestationObject),389        transports: ["internal"],390        publicKey: base64urlEncode(publicKeySpki),391        publicKeyAlgorithm: algorithm,392      },393      authenticatorAttachment: "platform",394      clientExtensionResults: {},395    }),396  });397}398399function broadcastPasskeyProGate(): void {400  chrome.tabs.query({}, (tabs) => {401    for (const tab of tabs) {402      if (tab.id !== undefined) {403        chrome.tabs.sendMessage(tab.id, { type: "PASSKEY_PRO_GATE" }).catch(() => {});404      }405    }406  });407}408409async function promptViaToast(request: PendingPasskeyRequest): Promise<boolean> {410  if (chrome.storage.session) {411    await chrome.storage.session.set({ [pendingStorageKey(request.requestId)]: request });412  }413414  const tabs = await new Promise<chrome.tabs.Tab[]>((resolve) => {415    chrome.tabs.query({ active: true, currentWindow: true }, resolve);416  });417  const tab = tabs[0];418419  if (tab?.id) {420    chrome.tabs.sendMessage(tab.id, {421      type: 'SHOW_PASSKEY_TOAST',422      payload: {423        site: request.rpId,424        displayName: request.userDisplayName ?? request.userName,425        username: request.userName,426        requestId: String(request.requestId),427      },428    }).catch(() => {});429  } else {430    await openApprovalPopup();431  }432433  return new Promise<boolean>((resolve) => {434    const timeoutId = setTimeout(async () => {435      approvals.delete(request.requestId);436      await clearPendingRequest(request.requestId);437      resolve(false);438    }, APPROVAL_TIMEOUT_MS);439440    approvals.set(request.requestId, { resolve, timeoutId });441  });442}443444async function handleGetRequest(445  request: chrome.webAuthenticationProxy.GetRequest446): Promise<void> {447  const options = JSON.parse(request.requestDetailsJson) as PublicKeyCredentialRequestOptionsJSON;448  if (!vault.isUnlocked()) {449    await openApprovalPopup();450    await rejectGet(request.requestId, "NotAllowedError", "Unlock Peach first.");451    return;452  }453454  if (!(await isProUser())) {455    await rejectGet(request.requestId, "NotAllowedError", "Passkey use requires Peach Pro.");456    broadcastPasskeyProGate();457    return;458  }459460  const passkeyBearing = vault.getEntries().filter((entry): entry is VaultEntry & { passkey: PasskeyData } =>461    entry.passkey !== undefined && !entry.deletedAt462  );463  const allowedCredentialIds = (options.allowCredentials ?? []).map((descriptor) => descriptor.id);464465  const match = passkeyBearing.find((entry) => {466    if (allowedCredentialIds.length > 0) {467      return allowedCredentialIds.includes(entry.passkey.credentialId);468    }469    if (!options.rpId) return false;470    return entry.passkey.rpId === options.rpId;471  });472473  if (!match) {474    await rejectGet(request.requestId, "NotAllowedError", "No matching passkey found.");475    return;476  }477478  const credential = match.passkey;479  // Chrome's webAuthenticationProxy path requires Peach-held private key480  // material to sign the assertion. Firefox-created passkeys delegate to the481  // platform authenticator — the browser will route to the platform UI482  // automatically when we reject, which is the right outcome.483  if (!credential.privateKeyJwk) {484    await rejectGet(485      request.requestId,486      "NotAllowedError",487      "This passkey was created on Firefox; sign in via the platform authenticator."488    );489    return;490  }491492  const approved = await promptViaToast({493    requestId: request.requestId,494    type: "get",495    rpId: credential.rpId,496    rpName: credential.rpName,497    userName: credential.userName,498    userDisplayName: credential.userDisplayName,499  });500  if (!approved) {501    await rejectGet(request.requestId, "NotAllowedError", "User denied request.");502    return;503  }504505  const nextSignCount = credential.signCount + 1;506  const flags = 0x05 | (credential.backupEligible ? 0x08 : 0) | (credential.backupState ? 0x10 : 0);507  const authData = await buildAuthenticatorData({508    rpId: credential.rpId,509    flags,510    signCount: nextSignCount,511  });512  const clientDataJSON = buildClientDataJSON("webauthn.get", options.challenge, originFromRpId(credential.rpId));513  const clientDataHash = new Uint8Array(514    await crypto.subtle.digest("SHA-256", new Uint8Array(clientDataJSON))515  );516  const signature = await signPasskeyAssertion(517    credential.privateKeyJwk,518    credential.algorithm,519    authData,520    clientDataHash521  );522523  await vault.updateEntry(match.id, {524    passkey: {525      ...credential,526      signCount: nextSignCount,527      lastUsedAt: Date.now(),528    },529  });530531  const responseJson = JSON.stringify({532    id: credential.credentialId,533    rawId: credential.credentialId,534    type: "public-key",535    response: {536      clientDataJSON: base64urlEncode(clientDataJSON),537      authenticatorData: base64urlEncode(authData),538      signature: base64urlEncode(signature),539      userHandle: credential.userHandle,540    },541    authenticatorAttachment: "platform",542    clientExtensionResults: {},543  });544545  await chrome.webAuthenticationProxy.completeGetRequest({546    requestId: request.requestId,547    responseJson,548  });549}550551// ── Firefox path ────────────────────────────────────────────────────────552//553// Firefox 150+ permits extensions to call navigator.credentials.create/get554// from the popup context with their host-permitted RP IDs. Peach uses that555// surface to register passkeys on behalf of the user. The page's own556// navigator.credentials call is observed via the MAIN-world detector557// (src/content/passkeys-firefox.ts) but never blocked or replaced; Peach's558// flow is parallel and explicit (the user must engage with Peach's button).559560const FIREFOX_PENDING_KEY = "passkey_pending_firefox";561const FIREFOX_DECLINE_PREFIX = "peach_passkey_offer_declined:";562const FIREFOX_DECLINE_TTL_MS = 30 * 24 * 60 * 60 * 1000; // 30 days563564export async function initiateFirefoxPasskeyCreate(args: {565  rpId: string;566  rpName: string;567  userName: string;568  userDisplayName?: string;569}): Promise<{ ok: boolean; error?: string }> {570  if (!(await isProUser())) {571    broadcastPasskeyProGate();572    return { ok: false, error: "passkey creation requires Peach Pro" };573  }574  if (!vault.isUnlocked()) {575    await openApprovalPopup();576    return { ok: false, error: "vault locked" };577  }578  if (!chrome.storage.session) {579    return { ok: false, error: "session storage unavailable" };580  }581582  const requestId = Date.now();583  const challenge = base64urlEncode(crypto.getRandomValues(new Uint8Array(32)));584  const userHandle = base64urlEncode(crypto.getRandomValues(new Uint8Array(32)));585586  const pending: PendingPasskeyRequest = {587    requestId,588    type: "create",589    rpId: args.rpId,590    rpName: args.rpName,591    userName: args.userName,592    userDisplayName: args.userDisplayName,593    browser: "firefox",594    challenge,595    userHandle,596  };597598  await chrome.storage.session.set({ [FIREFOX_PENDING_KEY]: pending });599  await openApprovalPopup();600  return { ok: true };601}602603export async function completeFirefoxPasskeyCreate(payload: {604  requestId: number;605  rpId: string;606  rpName: string;607  userName: string;608  userDisplayName?: string;609  userHandle: string;610  credentialId: string;611  publicKeyCose: string;612  algorithm: -7 | -8;613  aaguid?: string;614  transports?: string[];615  backupEligible?: boolean;616  backupState?: boolean;617}): Promise<{ ok: boolean; error?: string }> {618  if (!vault.isUnlocked()) return { ok: false, error: "vault locked" };619620  const passkey: PasskeyData = {621    rpId: payload.rpId,622    rpName: payload.rpName,623    credentialId: payload.credentialId,624    publicKeyCose: payload.publicKeyCose,625    userHandle: payload.userHandle,626    userName: payload.userName,627    userDisplayName: payload.userDisplayName ?? payload.userName,628    algorithm: payload.algorithm,629    signCount: 0,630    aaguid: payload.aaguid ?? base64urlEncode(new Uint8Array(16)),631    backupEligible: payload.backupEligible ?? false,632    backupState: payload.backupState ?? false,633    browser: "firefox",634    transports: payload.transports ?? ["internal"],635    createdAt: Date.now(),636  };637638  // Same attach-or-create flow as the Chrome path: prefer attaching to an639  // existing login entry for the same domain so the user ends up with one640  // entry per site, not two (a login + a passkey-only).641  const target = findAttachTarget(payload.rpId);642  if (target) {643    await vault.updateEntry(target.id, { passkey });644  } else {645    await vault.addEntry({646      type: "login",647      title: payload.rpName || payload.rpId,648      url: `https://${payload.rpId}`,649      username: payload.userName,650      passkey,651    });652  }653654  if (chrome.storage.session) {655    await chrome.storage.session.remove(FIREFOX_PENDING_KEY);656  }657  return { ok: true };658}659660export async function cancelFirefoxPasskeyCreate(): Promise<void> {661  if (chrome.storage.session) {662    await chrome.storage.session.remove(FIREFOX_PENDING_KEY);663  }664}665666function declineKey(domain: string): string {667  return `${FIREFOX_DECLINE_PREFIX}${domain}`;668}669670export async function recordPasskeyOfferDecline(domain: string): Promise<void> {671  if (!domain) return;672  await chrome.storage.local.set({ [declineKey(domain)]: Date.now() });673}674675export async function isPasskeyOfferDeclined(domain: string): Promise<boolean> {676  if (!domain) return false;677  const key = declineKey(domain);678  const stored = (await chrome.storage.local.get(key)) as Record<string, number | undefined>;679  const at = stored[key];680  if (typeof at !== "number") return false;681  if (Date.now() - at > FIREFOX_DECLINE_TTL_MS) {682    await chrome.storage.local.remove(key);683    return false;684  }685  return true;686}687688// ── Firefox content-script proxy path (v2.12.0) ────────────────────────689//690// The MAIN-world monkey-patch in src/content/passkeys-firefox.ts replaces691// navigator.credentials.create / .get on every Firefox page. It builds a692// clientDataJSON whose `origin` is the PAGE's origin (not moz-extension://),693// then hands every ceremony to the background via PASSKEY_HAS_CREDENTIALS,694// PASSKEY_CREATE, and PASSKEY_GET. The handlers below own those messages.695//696// Removal: when Firefox ships chrome.webAuthenticationProxy, the runtime flag697// FIREFOX_USE_CONTENT_SCRIPT_PROXY in src/shared/passkey-flags.ts evaluates698// to false and these handlers short-circuit. The full removal checklist is699// in that file — the deletion is purely subtractive.700701interface FirefoxAllowCredential {702  id: string;703  type?: string;704}705706interface FirefoxPubKeyCredParam {707  type?: string;708  alg: number;709}710711export interface FirefoxPasskeyHasCredentialsPayload {712  rpId: string;713  allowCredentials: FirefoxAllowCredential[];714}715716export interface FirefoxPasskeyCreatePayload {717  rpId: string;718  rpName?: string;719  userId: string;720  userName: string;721  userDisplayName?: string;722  challenge: string;723  clientDataJSON: number[];724  origin: string;725  pubKeyCredParams?: FirefoxPubKeyCredParam[];726  authenticatorSelection?: Record<string, unknown>;727  timeout?: number;728  attestation?: string;729}730731export interface FirefoxPasskeyGetPayload {732  rpId: string;733  challenge: string;734  clientDataJSON: number[];735  origin: string;736  allowCredentials: FirefoxAllowCredential[];737  userVerification?: string;738}739740interface FirefoxCreateCredentialResponse {741  type: "create";742  id: string;743  clientDataJSON: number[];744  attestationObject: string;745  authenticatorData: string;746  publicKey: string;747  algorithm: -7 | -8;748}749750interface FirefoxGetCredentialResponse {751  type: "get";752  id: string;753  clientDataJSON: number[];754  authenticatorData: string;755  signature: string;756  userHandle: string;757}758759type FirefoxPasskeyResult<T> =760  | { ok: true; credential: T }761  | { ok: false; error: "pro_required" | "user_cancelled" | "no_credentials" | "vault_locked" | "not_applicable" | "internal_error"; message?: string };762763function listPasskeyEntries(): Array<VaultEntry & { passkey: PasskeyData }> {764  return vault.getEntries().filter(765    (entry): entry is VaultEntry & { passkey: PasskeyData } =>766      entry.passkey !== undefined && !entry.deletedAt767  );768}769770export async function handlePasskeyHasCredentials(771  payload: FirefoxPasskeyHasCredentialsPayload772): Promise<{ ok: true; hasCredentials: boolean } | { ok: false; error: string }> {773  if (!FIREFOX_USE_CONTENT_SCRIPT_PROXY) {774    return { ok: false, error: "not_applicable" };775  }776  if (!vault.isUnlocked()) {777    // Cannot enumerate without the vault key. The MAIN-world proxy treats a778    // false answer as "fall through to the platform" — exactly the right779    // outcome when Peach is locked: the user gets the native UI instead.780    return { ok: true, hasCredentials: false };781  }782  const passkeys = listPasskeyEntries().filter(783    (entry) => entry.passkey.rpId === payload.rpId784  );785  if (passkeys.length === 0) return { ok: true, hasCredentials: false };786787  const allow = payload.allowCredentials ?? [];788  if (allow.length === 0) return { ok: true, hasCredentials: true };789790  const hasMatch = passkeys.some((entry) =>791    allow.some((ac) => ac.id === entry.passkey.credentialId)792  );793  return { ok: true, hasCredentials: hasMatch };794}795796/**797 * Approval prompt for the Firefox proxy ceremonies. Reuses the existing798 * pending-passkey channel (badge + popup + 60s timeout) — the same approval799 * UI Chrome ceremonies use, so the popup's State 11/12 view doesn't need800 * any new code path. The page-side proxy never sees the request id; the801 * background mints one and discards it after resolution.802 */803async function requestFirefoxApproval(args: {804  type: "create" | "get";805  rpId: string;806  rpName?: string;807  userName: string;808  userDisplayName?: string;809}): Promise<boolean> {810  // Synthetic request id — the Firefox proxy path doesn't have a811  // chrome.webAuthenticationProxy request to tie back to.812  const requestId = Date.now() + Math.floor(Math.random() * 1000);813  return promptUserApproval({814    requestId,815    type: args.type,816    rpId: args.rpId,817    rpName: args.rpName ?? args.rpId,818    userName: args.userName,819    userDisplayName: args.userDisplayName,820  });821}822823export async function handleFirefoxPasskeyCreate(824  payload: FirefoxPasskeyCreatePayload825): Promise<FirefoxPasskeyResult<FirefoxCreateCredentialResponse>> {826  if (!FIREFOX_USE_CONTENT_SCRIPT_PROXY) {827    return { ok: false, error: "not_applicable" };828  }829  if (!(await isProUser())) {830    broadcastPasskeyProGate();831    return { ok: false, error: "pro_required" };832  }833  if (!vault.isUnlocked()) {834    await openApprovalPopup();835    return { ok: false, error: "vault_locked" };836  }837838  const algorithm = pickPasskeyAlgorithm(payload.pubKeyCredParams ?? []);839  if (!algorithm) {840    return { ok: false, error: "internal_error", message: "No supported algorithm offered" };841  }842843  const approved = await requestFirefoxApproval({844    type: "create",845    rpId: payload.rpId,846    rpName: payload.rpName,847    userName: payload.userName,848    userDisplayName: payload.userDisplayName,849  });850  if (!approved) return { ok: false, error: "user_cancelled" };851852  const { bytes: credentialIdBytes, base64url: credentialId } = generateCredentialId();853  const { publicKeyCose, publicKeySpki, privateKeyJwk } = await generatePasskeyKeypair(algorithm);854855  // 0x45 = UP|UV|AT  (user-present + user-verified + attested-credential-data).856  // Matches Chrome's create flag set in handleCreateRequest above.857  const authenticatorData = await buildAuthenticatorData({858    rpId: payload.rpId,859    flags: 0x45,860    signCount: 0,861    credentialId: credentialIdBytes,862    publicKeyCose,863  });864  const attestationObject = createAttestationObject(authenticatorData);865866  const passkey: PasskeyData = {867    rpId: payload.rpId,868    rpName: payload.rpName ?? payload.rpId,869    credentialId,870    publicKeyCose: base64urlEncode(publicKeyCose),871    privateKeyJwk,872    userHandle: payload.userId,873    userName: payload.userName,874    userDisplayName: payload.userDisplayName ?? payload.userName,875    algorithm,876    signCount: 0,877    aaguid: base64urlEncode(new Uint8Array(16)),878    backupEligible: false,879    backupState: false,880    browser: "firefox",881    transports: ["internal"],882    createdAt: Date.now(),883  };884885  const target = findAttachTarget(payload.rpId);886  if (target) {887    await vault.updateEntry(target.id, { passkey });888  } else {889    await vault.addEntry({890      type: "login",891      title: payload.rpName || payload.rpId,892      url: `https://${payload.rpId}`,893      username: payload.userName,894      passkey,895    });896  }897898  return {899    ok: true,900    credential: {901      type: "create",902      id: credentialId,903      // The content script already encoded clientDataJSON with the page904      // origin; round-trip the exact bytes back so the RP sees the same905      // hash it computes locally.906      clientDataJSON: payload.clientDataJSON,907      attestationObject: base64urlEncode(attestationObject),908      authenticatorData: base64urlEncode(authenticatorData),909      publicKey: base64urlEncode(publicKeySpki),910      algorithm,911    },912  };913}914915export async function handleFirefoxPasskeyGet(916  payload: FirefoxPasskeyGetPayload917): Promise<FirefoxPasskeyResult<FirefoxGetCredentialResponse>> {918  if (!FIREFOX_USE_CONTENT_SCRIPT_PROXY) {919    return { ok: false, error: "not_applicable" };920  }921  if (!(await isProUser())) {922    broadcastPasskeyProGate();923    return { ok: false, error: "pro_required" };924  }925  if (!vault.isUnlocked()) {926    await openApprovalPopup();927    return { ok: false, error: "vault_locked" };928  }929930  const allow = payload.allowCredentials ?? [];931  const candidates = listPasskeyEntries().filter((entry) => {932    if (entry.passkey.rpId !== payload.rpId) return false;933    if (allow.length === 0) return true;934    return allow.some((ac) => ac.id === entry.passkey.credentialId);935  });936937  if (candidates.length === 0) return { ok: false, error: "no_credentials" };938939  // Most-recently-used wins when several credentials match. A future940  // multi-account selector goes here; for now this matches the Chrome path's941  // behavior for the common one-passkey-per-rp case.942  candidates.sort((a, b) => (b.passkey.lastUsedAt ?? 0) - (a.passkey.lastUsedAt ?? 0));943  const match = candidates[0]!;944  const credential = match.passkey;945946  if (!credential.privateKeyJwk) {947    // Pre-v2.12.0 Firefox passkeys delegated to the platform authenticator948    // — no Peach-held private key to sign with. The MAIN-world proxy treats949    // no_credentials as a fall-through, which routes to the platform UI.950    return { ok: false, error: "no_credentials" };951  }952953  const approved = await requestFirefoxApproval({954    type: "get",955    rpId: credential.rpId,956    rpName: credential.rpName,957    userName: credential.userName,958    userDisplayName: credential.userDisplayName,959  });960  if (!approved) return { ok: false, error: "user_cancelled" };961962  const nextSignCount = credential.signCount + 1;963  // 0x05 = UP|UV. backup bits track whatever was set at registration time964  // (consistent with the Chrome path).965  const flags =966    0x05 |967    (credential.backupEligible ? 0x08 : 0) |968    (credential.backupState ? 0x10 : 0);969  const authenticatorData = await buildAuthenticatorData({970    rpId: credential.rpId,971    flags,972    signCount: nextSignCount,973  });974975  // The content script supplied clientDataJSON bytes built with the page976  // origin. SHA-256 those bytes verbatim — never re-serialize, or the hash977  // diverges from what the RP computes.978  const clientDataBytes = new Uint8Array(payload.clientDataJSON);979  const clientDataHash = new Uint8Array(980    await crypto.subtle.digest("SHA-256", clientDataBytes)981  );982  const signature = await signPasskeyAssertion(983    credential.privateKeyJwk,984    credential.algorithm,985    authenticatorData,986    clientDataHash987  );988989  await vault.updateEntry(match.id, {990    passkey: {991      ...credential,992      signCount: nextSignCount,993      lastUsedAt: Date.now(),994    },995  });996997  return {998    ok: true,999    credential: {1000      type: "get",1001      id: credential.credentialId,1002      clientDataJSON: payload.clientDataJSON,1003      authenticatorData: base64urlEncode(authenticatorData),1004      signature: base64urlEncode(signature),1005      userHandle: credential.userHandle,1006    },1007  };1008}10091010export async function setupPasskeyProxy(): Promise<void> {1011  if (!isPasskeySupported()) return;10121013  // Firefox doesn't expose chrome.webAuthenticationProxy listeners. The1014  // popup-context credential creator is the entry point; nothing to wire here.1015  if (detectSharedBrowser() === "firefox") {1016    await refreshPasskeyProxy();1017    return;1018  }10191020  if (!listenersRegistered) {1021    chrome.webAuthenticationProxy.onIsUvpaaRequest.addListener((requestInfo) => {1022      void chrome.webAuthenticationProxy.completeIsUvpaaRequest({1023        requestId: requestInfo.requestId,1024        isUvpaa: vault.isUnlocked(),1025      });1026    });1027    chrome.webAuthenticationProxy.onCreateRequest.addListener((requestInfo) => {1028      void handleCreateRequest(requestInfo).catch(async (error) => {1029        console.error("Peach passkey create failed", error);1030        await rejectCreate(1031          requestInfo.requestId,1032          "UnknownError",1033          error instanceof Error ? error.message : "Passkey creation failed."1034        );1035      });1036    });1037    chrome.webAuthenticationProxy.onGetRequest.addListener((requestInfo) => {1038      void handleGetRequest(requestInfo).catch(async (error) => {1039        console.error("Peach passkey get failed", error);1040        await rejectGet(1041          requestInfo.requestId,1042          "UnknownError",1043          error instanceof Error ? error.message : "Passkey authentication failed."1044        );1045      });1046    });1047    chrome.webAuthenticationProxy.onRequestCanceled.addListener((requestId) => {1048      void resolvePendingPasskeyRequest(requestId, false);1049    });1050    listenersRegistered = true;1051  }10521053  await refreshPasskeyProxy();1054}