Adds three layers of account-security hardening, all gated behind the
existing SignInWithAppSessionAsync-equivalent (now AppSessionIssuer) so
every sign-in path -- local, Google, Microsoft -- goes through the same
lockout/2FA checks:
- Per-account lockout: Identity's built-in lockout store (columns already
provisioned, previously unused) is now wired up in AuthController.Login
via IsLockedOutAsync/AccessFailedAsync/ResetAccessFailedCountAsync, 5
failed attempts / 15 min, same generic 401 as wrong-password to avoid
enumeration.
- RFC 6238 TOTP 2FA (Otp.NET) with QR-code setup (QRCoder, fully local/
offline) on a new TwoFactorController: setup requires password
re-confirmation and returns a pending (unconfirmed) secret + QR; the
secret is only persisted as active once verify-setup checks a real
code. Secrets are encrypted at rest via the same IDataProtector pattern
already used for Gmail/Microsoft OAuth refresh tokens.
- Login/OAuth exchange now checks TwoFactorEnabled before issuing a real
session. If enabled, it hands back an opaque, server-side (IMemoryCache)
pending token via a new ITwoFactorPendingTokenService -- deliberately
NOT a JWT, so it can never be presented as a bearer token to bypass the
2FA check on any other endpoint. Only POST /api/auth/2fa/challenge can
redeem it, rate-limited at 5/5min (tighter than password login, since a
6-digit space is far more brute-forceable).
- One-time recovery codes (10 per enable/regenerate, SHA-256-hashed at
rest, shown once in plaintext) accepted in the same challenge endpoint
as an alternative to a TOTP code.
Schema: AspNetUsers gains TotpSecretEncrypted / TotpPendingSecretEncrypted
/ TotpEnabledAtUtc, plus a new TwoFactorRecoveryCodes table, added to both
the SQLite and MySQL dialect blocks in the startup schema reconciler.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
b3 of the multi-provider email roadmap. Adds ImapConnection model + table
(reconciler pattern, SQLite+MySQL), ImapService (MailKit-backed IMAP client),
ImapProvider implementing the existing IEmailProvider contract unchanged,
and ImapController for credential-based connect (no OAuth — user supplies
host/username/password directly, verified by a live connect before storage).
Scope, documented inline with ponytail: comments:
- INBOX only, no multi-folder support.
- Thread grouping approximates the References/In-Reply-To chain root rather
than the IMAP THREAD extension, which not every server implements.
- External message ids are IMAP UIDs, scoped to the connection's current
UIDVALIDITY.
Security: ran the security-audit skill against this diff (credential
handling + arbitrary-host connect is exactly the class of change the
standing security gate exists for). Found and fixed a real SSRF: the
connect endpoint let an authenticated user point the server at an
arbitrary host:port with no internal-range check, and connect-vs-auth
failure was distinguishable to the caller -- together a working oracle to
fingerprint internal services (loopback/RFC1918/link-local/cloud metadata)
from the server's network position. Fixed with EnsureHostIsExternalAsync
(DNS-resolve + reject internal ranges, re-checked on every reconnect to
close the DNS-rebinding gap) and a single generic failure message that no
longer distinguishes connect vs auth failure. 7 regression tests added.
Dependency: MailKit 4.17.0 (MIT license) on JobTrackerBackend.csproj --
stdlib has no IMAP client; hand-rolling IMAP4rev1 (TLS, SASL, MIME parsing)
would be a large, security-sensitive protocol implementation nobody asked
for, so this is the correct dependency, not a stdlib substitute.
168/168 green (161 existing + 7 new SSRF regression tests; the earlier
14 IMAP feature tests are included in the 161).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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