---
phase: 04-csrf-protection
plan: 01
subsystem: auth
tags: [csrf, security, session, admin]

requires:
  - phase: []
    provides: []
provides:
  - "CsrfToken class — token generation, validation, regeneration"
  - "CSRF protection on all admin FormRequestHandler POSTs"
  - "CSRF protection on login and 2FA forms"
  - "Token regeneration after successful login (session fixation prevention)"
affects: []

tech-stack:
  added: []
  patterns: ["CSRF guard before field validation in FormRequestHandler", "bin2hex(random_bytes(32)) per-session token"]

key-files:
  created:
    - autoload/Shared/Security/CsrfToken.php
    - tests/Unit/Shared/Security/CsrfTokenTest.php
  modified:
    - autoload/admin/Support/Forms/FormRequestHandler.php
    - admin/templates/components/form-edit.php
    - admin/templates/site/unlogged-layout.php
    - admin/templates/users/user-2fa.php
    - autoload/admin/App.php

key-decisions:
  - "Single CSRF validate() call placed before switch($sa) in special_actions() — covers all POST actions uniformly"
  - "regenerate() called on successful login AND after 2FA verify — both session fixation points"

patterns-established:
  - "CSRF check = first operation in handleSubmit(), before field validation"
  - "CsrfToken::getToken() in templates via htmlspecialchars() escape"

duration: ~
started: 2026-03-12T00:00:00Z
completed: 2026-03-12T00:00:00Z
---

# Phase 4 Plan 01: CSRF Protection Summary

**CSRF protection added to entire admin panel — all state-changing POST endpoints now validate a per-session token.**

## Performance

| Metric | Value |
|--------|-------|
| Duration | single session |
| Completed | 2026-03-12 |
| Tasks | 3 completed |
| Files modified | 7 |

## Acceptance Criteria Results

| Criterion | Status | Notes |
|-----------|--------|-------|
| AC-1: Formularz edycji zawiera _csrf_token | Pass | form-edit.php linia 81 |
| AC-2: POST bez tokenu odrzucany przez FormRequestHandler | Pass | FormRequestHandler.php linia 36–42 |
| AC-3: Formularz logowania zawiera _csrf_token | Pass | unlogged-layout.php linia 46 |
| AC-4: special_actions() waliduje CSRF dla user-logon i 2FA | Pass | App.php linia 47–51, przed switch |
| AC-5: Token unikalny per sesja, min. 64 znaki hex | Pass | bin2hex(random_bytes(32)) = 64 znaków |

## Accomplishments

- Nowa klasa `\Shared\Security\CsrfToken` z `getToken()`, `validate()`, `regenerate()`
- Guard w `FormRequestHandler::handleSubmit()` jako pierwsza operacja przed walidacją pól
- Token w szablonach: `form-edit.php`, `unlogged-layout.php`, `user-2fa.php` (oba formularze)
- `regenerate()` wywoływany po udanym logowaniu (linia 96) i po weryfikacji 2FA (linia 140) — zapobiega session fixation
- 6 testów jednostkowych w `CsrfTokenTest.php`

## Task Commits

| Task | Commit | Type | Description |
|------|--------|------|-------------|
| Wszystkie 3 taski | `55988887` | security | faza 4 - ochrona CSRF panelu administracyjnego |

## Files Created/Modified

| File | Change | Purpose |
|------|--------|---------|
| `autoload/Shared/Security/CsrfToken.php` | Created | Token generation, validation, regeneration |
| `tests/Unit/Shared/Security/CsrfTokenTest.php` | Created | 6 unit tests dla CsrfToken |
| `autoload/admin/Support/Forms/FormRequestHandler.php` | Modified | CSRF guard w handleSubmit() |
| `admin/templates/components/form-edit.php` | Modified | Hidden input _csrf_token |
| `admin/templates/site/unlogged-layout.php` | Modified | Token w formularzu logowania |
| `admin/templates/users/user-2fa.php` | Modified | Token w obu formularzach 2FA |
| `autoload/admin/App.php` | Modified | CSRF walidacja w special_actions() + regenerate() |

## Decisions Made

| Decision | Rationale | Impact |
|----------|-----------|--------|
| Jeden blok validate() przed switch($sa) | Pokrywa wszystkie case jednym sprawdzeniem | Prostota, mniej kodu |
| `\Exception` catch (nie `\Throwable`) | PHP 7.4 compat, wystarczy dla typowych wyjątków | Akceptowalny tradeoff |
| Logout poza zakresem (GET link) | Zmiana na POST wykracza poza tę fazę | Zostawione do osobnej iteracji |

## Deviations from Plan

Brak — plan wykonany zgodnie ze specyfikacją.

## Next Phase Readiness

**Ready:**
- Cały admin panel chroniony przed CSRF
- Wzorzec do replikacji: `CsrfToken::getToken()` w szablonie + `validate()` w handlerze

**Concerns:**
- `admin/ajax.php` (shop-category, users ajax) jeszcze nie pokryty — odnotowane w planie jako out-of-scope

**Blockers:** None

---
*Phase: 04-csrf-protection, Plan: 01*
*Completed: 2026-03-12*