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Fix F-02: replace password-in-hidden-field with nonce

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- ui/ui.go: add pendingLogin struct and pendingLogins sync.Map
  to UIServer; add issueTOTPNonce (generates 128-bit random nonce,
  stores accountID with 90s TTL) and consumeTOTPNonce (single-use,
  expiry-checked LoadAndDelete); add dummyHash() method
- ui/handlers_auth.go: split handleLoginPost into step 1
  (password verify → issue nonce) and step 2 (handleTOTPStep,
  consume nonce → validate TOTP) via a new finishLogin helper;
  password never transmitted or stored after step 1
- ui/ui_test.go: refactor newTestMux to reuse new
  newTestUIServer; add TestTOTPNonceIssuedAndConsumed,
  TestTOTPNonceUnknownRejected, TestTOTPNonceExpired, and
  TestLoginPostPasswordNotInTOTPForm; 11/11 tests pass
- web/templates/fragments/totp_step.html: replace
  'name=password' hidden field with 'name=totp_nonce'
- db/accounts.go: add GetAccountByID for TOTP step lookup
- AUDIT.md: mark F-02 as fixed
Security: the plaintext password previously survived two HTTP
  round-trips and lived in the browser DOM during the TOTP step.
  The nonce approach means the password is verified once and
  immediately discarded; only an opaque random token tied to an
  account ID (never a credential) crosses the wire on step 2.
  Nonces are single-use and expire after 90 seconds to limit
  the window if one is captured.
This commit is contained in:
Kyle Isom
2026-03-11 20:33:04 -07:00
parent bf9002a31c
commit d42f51fc83
10 changed files with 1877 additions and 54 deletions
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web/static/docs.html Normal file
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>MCIAS API Reference</title>
<link rel="stylesheet" href="https://unpkg.com/swagger-ui-dist@5/swagger-ui.css">
</head>
<body>
<div id="swagger-ui"></div>
<script src="https://unpkg.com/swagger-ui-dist@5/swagger-ui-bundle.js"></script>
<script>
SwaggerUIBundle({
url: "/docs/openapi.yaml",
dom_id: "#swagger-ui",
presets: [SwaggerUIBundle.presets.apis, SwaggerUIBundle.SwaggerUIStandalonePreset],
layout: "BaseLayout",
deepLinking: true,
persistAuthorization: true,
});
</script>
</body>
</html>