40b3154a343e9c24fefddaeb526ce710c61e94e7
4 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
 Zaki
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40b3154a34 |
feat: MFA tools, single-instance, tray polish, prefs persistence
Session highlights:
- feat(prefs): DPAPI-backed key/value store (PM.UserPrefs) — fixes
rememberedUsername being lost across reboots due to the random
ephemeral HTTP port changing the localStorage origin every launch.
Bridge cmd://prefs/{get,set} round-trips through Delphi.
- feat(tray): icon visible from startup (NIM_ADD at constructor, not
at first minimize). Tray context menu themed via uxtheme!135
SetPreferredAppMode so it follows the app's dark/light setting.
- feat(single-instance): named mutex + RegisterWindowMessage broadcast.
Second launch posts WM_PMSHOW to HWND_BROADCAST and exits; the
running bridge restores the window from tray. Mutex lives in Local\
namespace so distinct Windows users can still each run one.
- feat(mfa): Authenticator sidebar view (live TOTP codes for every
entry with a secret) + standalone TOTP generator modal (paste
base32 / otpauth:// URI, or generate a random 20-byte secret).
- feat(sidebar): Folders / Tags / Tools sections collapsible with
chevron toggle. Badge counts stay visible when collapsed. State
persisted in settings_json (synced across devices).
- feat(autofill): hotkey when vault is locked now restores the app
and focuses the master password input instead of no-op'ing
silently. Cleaner UX for the common "I hit Ctrl+Shift+L but the
vault was locked" path.
- feat(quick-unlock): when enabled, skip lockVault on Windows lock /
sleep. Rationale: the DPAPI blob already gates access via the
Windows account, so re-locking on top of the OS lock is redundant.
Idle auto-lock still fires (separate opt-in).
- fix(quick-unlock): re-sync state.quickUnlockEnabled from DPAPI
source-of-truth at boot, instead of trusting (now-volatile)
localStorage.
- docs: CLAUDE.md updated with all new modules, bridge commands,
and the port-ephemeral pitfall.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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|
Zaki
|
749dc87058 |
feat(unlock): Quick unlock via DPAPI (remember on this device)
User-controlled opt-in to skip the master-password prompt on subsequent
app starts. The vault state (raw AES key + salt + username + session
token) is bundled and handed to the Delphi side, which DPAPI-encrypts
it with CRYPTPROTECT_CURRENT_USER and stashes the blob at
%LOCALAPPDATA%\PMServer\quickunlock.bin.
Honest threat model
===================
This is NOT biometric authentication. The DPAPI scope is the Windows
USER ACCOUNT — any process running as the same user can decrypt the
blob via the same DPAPI call. The security perimeter is the Windows
account itself. The Settings UI label is "Quick unlock" with an
explainer:
"convenient on a personal machine, not safe on a shared one"
If the user has Windows Hello / fingerprint / PIN configured at the
OS level, then Windows login is biometric-gated and that gating
transitively applies to DPAPI access — but the cryptographic strength
of the encryption isn't tied to the biometric, it's tied to the
Windows account secret. Honest framing matters here, so the feature
isn't sold as "biometric".
Backend
=======
New unit Source/PM.QuickUnlock.pas:
- StoreQuickUnlock(bytes) → DPAPI-encrypt and persist to
%LOCALAPPDATA%\PMServer\quickunlock.bin
- LoadQuickUnlock(out bytes) → read file, DPAPI-decrypt
- ClearQuickUnlock → forget-me
- HasQuickUnlock → file existence probe
DPAPI declarations are local (CryptProtectData / CryptUnprotectData
from crypt32.dll) — Winapi.WinCrypt's signatures drift across Delphi
versions and we don't want to fight that.
Bridge commands (UMainForm.HandleBridgeCommand):
cmd://quickunlock/store?data=<base64> payload opaque to Delphi
cmd://quickunlock/get → ExecuteJavaScript callback
Bridge.onQuickUnlockResult(b64|null)
cmd://quickunlock/clear forget-me
cmd://quickunlock/status → Bridge.onQuickUnlockStatus(bool)
The get / status results are returned via ExecuteJavaScript rather than
HTTP (the bridge is request-only) — JS resolves a Promise that the
caller awaited.
Client
======
state.quickUnlockEnabled mirrors localStorage flag, lazy-cleared if the
backing DPAPI blob has gone missing (e.g., user reset Windows profile).
enableQuickUnlock():
1. askReauth + /reauth to verify it's actually the user.
2. exportKey('raw', state.cryptoKey) — extractable already.
3. JSON-bundle { v, username, salt, token, csrf, key } → base64.
4. cmd://quickunlock/store sends the blob to Delphi.
tryQuickUnlock() (called from init):
1. Probe localStorage flag.
2. cmd://quickunlock/get, await Bridge.onQuickUnlockResult.
3. Decode JSON, importKey, restore state.* + sessionStorage.
4. Return true on success, false to fall through to master-pw login.
Two restore scenarios both covered:
A. Same app session (sessionStorage still populated, only cryptoKey
was wiped by lock). tryQuickUnlock just restores the key.
B. Cold start (sessionStorage empty). tryQuickUnlock restores
EVERYTHING from the DPAPI blob, including the session token.
UI
==
Settings panel → new "Quick unlock" section above Recovery key.
Single toggle button: "Enable on this device" / "Disable" with status
line above. Opens settings → bridgeQuickUnlockStatus() reconciles the
JS-side flag with the actual file (drift detection).
Stale-blob protection
=====================
The stored blob holds the AES key BYTES, which would become useless
if the vault were re-encrypted under a different key. Three paths
that re-encrypt the vault now also wipe the DPAPI blob:
- Explicit doLogout (user said "I'm done")
- Master password change (new key, old blob can't decrypt anything)
- (Recovery redeem already forces master pw change → covered.)
The blob persists across the passive lockVault() flow on purpose —
that's the whole point: lock without losing convenience.
Init wiring
===========
On app start, the existing "restore session from sessionStorage" path
now falls through to tryQuickUnlock if either sessionStorage is empty
OR the cryptoKey is gone. Auth screen shows up only after both
attempts fail.
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|
Zaki
|
01c56edf25 |
feat(recovery): single-use recovery code for forgotten master password
In a zero-knowledge vault, forgetting the master password normally
means losing the data — the AES key is derived from the master pw
and the server can't help. This commit adds the standard escape
hatch: a one-time recovery code that key-wraps the AES key so the
user can get back in.
Threat model
============
The plaintext recovery code is shown to the user exactly once, at
generation time. Server only ever stores SHA-256(code) + an AES-GCM
wrap of the vault key under a KEK = PBKDF2(code, kdf_salt, 600k).
Without the plaintext code the server cannot unwrap. The code is
high-entropy (96 bits from a 32-char ambiguity-free alphabet, in 4
groups of 4) — printed form is misreading-resistant.
Single use: redeeming deletes the row inside the same DB.Lock the
lookup happened in, so concurrent redeem attempts are race-free.
Failed redemptions feed both the per-IP rate limit AND the per-
username lockout, so brute-forcing the code is infeasible.
Schema
======
recovery_keys (
user_id INTEGER PRIMARY KEY (1:1 with users, FK cascade),
code_hash TEXT NOT NULL (SHA-256 hex of plaintext code),
kdf_salt TEXT NOT NULL (PBKDF2 salt for KEK derivation),
wrapped_key TEXT NOT NULL (base64 AES-GCM ciphertext of vault key),
wrapped_iv TEXT NOT NULL (base64 12B IV for the wrap),
created_at DATETIME DEFAULT CURRENT_TIMESTAMP
)
Backend: new unit PM.Handler.Recovery
=====================================
GET /recovery-key/status (auth) -> { configured, created_at? }
POST /recovery-key/setup (auth + CSRF) body {masterPassword, codeHash,
kdfSalt, wrappedKey, wrappedIv}
DELETE /recovery-key (auth + CSRF) -> remove config
POST /recovery-key/redeem (NO auth) body {username, code}
-> session + wrappedKey + wrappedIv + kdfSalt
+ user's current salt + kdfIterations
VerifyMasterPassword() helper handles both legacy 'pbkdf2' and
current 'pbkdf2-sha256' schemes consistently with PM.Handler.Auth.
Setup flow
==========
1. Settings → "Generate recovery code" button (asks master pw via reauth).
2. Client generates: 16-char code + fresh kdf_salt + exports the current
AES key via crypto.subtle.exportKey('raw').
3. Client wraps the raw key under KEK=PBKDF2(code, kdf_salt, 600k)
with a random 12B IV → base64.
4. POSTs to /recovery-key/setup. Server verifies master pw, INSERT-or-
replaces the row (DELETE+INSERT, no UPSERT — same pattern as the
lockout table since FireDAC's UPSERT support is patchy).
5. Confirm modal shows the plaintext code in a monospace, user-select-all
panel. The modal is forcing: "I saved it" button is the only way out.
Modal is the only place the code ever appears — server never sees it.
Redeem flow (forgot master pw)
==============================
1. Auth screen → "Forgot master password? Use a recovery code" link.
2. promptDialog: username, then code (masked input).
3. POST /recovery-key/redeem. Server hashes the typed code, joins with
users by username, ConstantTimeEquals against stored hash. On match:
- deletes the recovery_keys row (single-use)
- issues a fresh session token + CSRF
- returns: { token, csrfToken, salt, kdfIterations, kdfSalt,
wrappedKey, wrappedIv, userId }
4. Client unwraps the AES key with PBKDF2(code, kdfSalt, 600k) → raw bytes
→ importKey('raw') back into a CryptoKey.
5. State is reconstituted from the new session, persistCryptoKey, enterApp.
6. Client immediately opens the Change-master-password modal — the
recovery code is consumed and the account needs a fresh master pw
AND a fresh recovery code (the user generates a new one from Settings).
Backward compat
===============
Recovery is opt-in. Existing users see "No recovery key set" in Settings
until they generate one. No migration needed — the table is created via
CREATE TABLE IF NOT EXISTS at server startup, FK cascade on user delete.
Minor UI additions
==================
- .btn-link CSS class for the auth-screen "Forgot master password?" link.
- Recovery-status label in Settings refreshed on every openSettings()
via GET /recovery-key/status.
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|
Zaki
|
506aee7e6f |
feat: Delphi backend + JS↔Delphi bridge (clipboard, tray, auto-lock)
Introduces the Delphi 12 FMX backend (PMServer) that hosts the embedded
WebView2 vault on 127.0.0.1, and a native bridge between JS and Delphi
that wires three privacy-focused features:
1. Secure clipboard
Copying a password registers the Win32 "ExcludeClipboardContentFromMonitorProcessing"
format alongside CF_UNICODETEXT, so Win+V clipboard history never sees
the value. Auto-clears after 30s via TTimer. Bridge.copySecure() in
app.js routes all password/username/secret copy paths through the
native layer when running inside the Delphi WebView2 (falls back to
navigator.clipboard for the PHP standalone).
2. Tray icon (X-to-tray when server running)
Closing the dev panel hides both the form HWND and the TFMAppClass
per-process proxy window that owns the FMX taskbar entry — the form's
HWND alone is not the taskbar-visible one in FMX (took some iteration
to discover). Tray menu: Open, Lock vault, Quit. Clipboard is force-
cleared on minimize as extra safety. First-time minimize fires a
balloon notification so the user knows the app is still running.
3. Auto-lock on Windows session lock (Win+L)
wtsapi32.dll!WTSRegisterSessionNotification on a dedicated message-only
window. On WM_WTSSESSION_CHANGE / WTS_SESSION_LOCK, the bridge calls
ExecuteJavaScript('lockVault()'). Same path used by the tray "Lock vault"
menu item.
Bridge architecture:
- JS → Delphi via cmd:// URLs intercepted in OnBeforeNavigate
(pattern lifted from DeskInsight Monaco). Currently exposes
cmd://clipboard/copy?text=...&clear=... and cmd://clipboard/clear.
- Delphi → JS via TTMSFNCWebBrowser.ExecuteJavaScript with guarded
calls (typeof check) so the bridge degrades cleanly if app.js isn't
loaded yet.
Files:
- Source/PM.Bridge.pas (new) — TSecureClipboard + TPMBridge
- UMainForm.pas/.fmx — bridge wiring, FormCloseQuery intercept, tray
callbacks (BridgeTrayRestore / BridgeLockRequest / BridgeQuit)
- js/app.js — Bridge object, 5 navigator.clipboard sites migrated to
Bridge.copySecure with PHP-compatible fallback, Bridge.onTrayRestore
handler that resets the auto-lock timer
.gitignore extended with Delphi build artifacts (*.dcu, Win32/, Win64/,
__history/, __recovery/, *.identcache, *.dsk, *.local, etc.) so source
checkouts stay clean.
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