feat(auth): add per-account lockout and TOTP 2FA with recovery codes

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>

This commit is contained in:

cesnimda

2026-07-12 20:48:09 +02:00

parent 0cd1ba398e

commit c68b49eda0

13 changed files with 699 additions and 30 deletions

									
										JobTrackerBackend/JobTrackerBackend.csproj
									
		+2
		
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				@@ -27,6 +27,8 @@

				      <PrivateAssets>all</PrivateAssets>

				    </PackageReference>

				    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.14" />

				    <PackageReference Include="Otp.NET" Version="1.4.1" />

				    <PackageReference Include="QRCoder" Version="1.8.0" />

				    <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.14.0" />

				    <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="8.14.0" />

				    <PackageReference Include="MailKit" Version="4.17.0" />