Merge pull request 'feat(tradein/auth): password hashing + session config foundation (#2550)' (#2560) from feat/tradein-auth-password-foundation into main

2026-07-30 07:04:56 +00:00 · 2026-07-30 07:04:56 +00:00 · 876538c57f
commit 876538c57f
parent e703d64a7f 3f1b86f16a
5 changed files with 231 additions and 0 deletions
--- a/tradein-mvp/backend/app/core/config.py
+++ b/tradein-mvp/backend/app/core/config.py
@ -49,6 +49,28 @@ class Settings(BaseSettings):
        default="", validation_alias="TRADEIN_INTERNAL_AUTH_SECRET"
    )

+    # ── #2550: DB-auth foundation (bcrypt password hashing + session cookie) ────
+    # Подготовительные поля для #2549 (эпик). Enforcement непустого session_secret
+    # (fail-fast при пустом значении в prod) добавится в #2552 — здесь дефолт
+    # намеренно пустой, чтобы прод-контейнер не падал на старте до того как
+    # секрет проставлен в .env.runtime. ENV: SESSION_SECRET.
+    session_secret: str = Field(default="", validation_alias="SESSION_SECRET")
+    # Имя cookie для DB-based сессии (отдельно от Caddy basic_auth / trusted-header).
+    session_cookie_name: str = Field(
+        default="tradein_session", validation_alias="SESSION_COOKIE_NAME"
+    )
+    # TTL сессии в часах. Дефолт 720ч (30 дней).
+    session_ttl_hours: int = Field(default=720, validation_alias="SESSION_TTL_HOURS")
+    # "dual" — переходный режим (Caddy trusted-header ИЛИ DB-сессия оба валидны);
+    # "db_only" — только DB-сессия (Caddy basic_auth убран). Переключение — #2552+.
+    auth_mode: Literal["dual", "db_only"] = Field(default="dual", validation_alias="AUTH_MODE")
+    # Rate-limit на /login: не более login_rate_limit попыток за
+    # login_rate_limit_window_s секунд на ключ (обычно IP или username).
+    login_rate_limit: int = Field(default=5, validation_alias="LOGIN_RATE_LIMIT")
+    login_rate_limit_window_s: int = Field(
+        default=300, validation_alias="LOGIN_RATE_LIMIT_WINDOW_S"
+    )
+
    # Geocoder. Env var name `YANDEX_GEOCODER_API_KEY` — consistent с scripts/
    # backfill_house_coords.py + audit_address_mismatch.py + main backend
    # OpenRouteService_API_KEY pattern. Renamed from YANDEX_GEOCODER_KEY (PR F).
--- a/tradein-mvp/backend/app/core/password.py
+++ b/tradein-mvp/backend/app/core/password.py
@ -0,0 +1,61 @@
+"""Bcrypt password hashing для DB-auth (#2550 — foundation, эпик #2549).
+
+bcrypt тихо обрезает пароли длиннее 72 байт (UTF-8) — это silent-truncation
+дыра (два разных пароля с общим 72-байтовым префиксом хешируются одинаково).
+`hash_password` явно ловит это и падает с ValueError вместо тихого поведения.
+`verify_password` на длинном пароле возвращает False (не raise) — сравнение
+паролей не должно ронять запрос авторизации.
+"""
+
+from __future__ import annotations
+
+import logging
+
+import bcrypt
+
+logger = logging.getLogger(__name__)
+
+_BCRYPT_MAX_BYTES = 72
+_BCRYPT_ROUNDS = 12
+
+
+def hash_password(plain: str) -> str:
+    """Хеширует пароль через bcrypt (rounds=12).
+
+    Raises:
+        ValueError: пустой пароль или пароль длиннее 72 байт в UTF-8
+            (bcrypt тихо обрезает — недопустимо, см. модульный docstring).
+    """
+    if not plain:
+        raise ValueError("password must not be empty")
+
+    encoded = plain.encode("utf-8")
+    if len(encoded) > _BCRYPT_MAX_BYTES:
+        raise ValueError(
+            f"password too long: {len(encoded)} bytes (bcrypt max {_BCRYPT_MAX_BYTES})"
+        )
+
+    salt = bcrypt.gensalt(rounds=_BCRYPT_ROUNDS)
+    hashed = bcrypt.hashpw(encoded, salt)
+    return hashed.decode("utf-8")
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    """Сверяет пароль с bcrypt-хешем.
+
+    Пустой пароль или пароль длиннее 72 байт в UTF-8 → False (не raise —
+    verify — это false/true проверка на этапе логина, а не валидация ввода).
+    """
+    if not plain or not hashed:
+        return False
+
+    encoded = plain.encode("utf-8")
+    if len(encoded) > _BCRYPT_MAX_BYTES:
+        return False
+
+    try:
+        return bcrypt.checkpw(encoded, hashed.encode("utf-8"))
+    except (ValueError, TypeError) as e:
+        # Malformed hash (напр. не-bcrypt строка в БД) — не должно ронять login.
+        logger.warning("verify_password: malformed hash rejected: %s", e)
+        return False
--- a/tradein-mvp/backend/pyproject.toml
+++ b/tradein-mvp/backend/pyproject.toml
@ -25,6 +25,7 @@ dependencies = [
    "sentry-sdk>=2.0.0",          # мониторинг ошибок → GlitchTip (#396)
    "redis>=5.0.0",               # async hot cache для /api/v1/search (Phase 3.2)
    "pyyaml>=6.0.0",              # RBAC roles.yaml loader (app/core/auth.py)
+    "bcrypt>=4.2.0",              # password hashing для DB-auth (#2550)
    "playwright>=1.45",          # Playwright client для connect к tradein-browser (#905)
    "scraper-kit",               # internal workspace-package (#2137) — общие утилиты скрапперов;
                                 # резолвится из workspace (см. [tool.uv.sources]), не с PyPI.
--- a/tradein-mvp/backend/tests/test_password.py
+++ b/tradein-mvp/backend/tests/test_password.py
@ -0,0 +1,79 @@
+"""Тесты для app/core/password.py — bcrypt hash/verify (#2550)."""
+
+from __future__ import annotations
+
+import pytest
+
+from app.core.password import hash_password, verify_password
+
+
+def test_roundtrip() -> None:
+    """hash_password → verify_password с тем же паролем возвращает True."""
+    hashed = hash_password("correct horse battery staple")
+    assert verify_password("correct horse battery staple", hashed) is True
+
+
+def test_wrong_password_returns_false() -> None:
+    """Неверный пароль против валидного хеша → False."""
+    hashed = hash_password("correct horse battery staple")
+    assert verify_password("wrong password", hashed) is False
+
+
+def test_hash_too_long_raises_value_error() -> None:
+    """Пароль >72 байт в UTF-8 → ValueError в hash_password (нет silent truncation)."""
+    long_password = "a" * 73
+    with pytest.raises(ValueError):
+        hash_password(long_password)
+
+
+def test_hash_exactly_72_bytes_ok() -> None:
+    """Ровно 72 байта — граничное значение, ещё допустимо."""
+    password = "a" * 72
+    hashed = hash_password(password)
+    assert verify_password(password, hashed) is True
+
+
+def test_hash_too_long_multibyte_raises_value_error() -> None:
+    """40 кириллических символов = 80 байт UTF-8 (2 байта/символ) → ValueError.
+
+    Проверяет, что лимит считается в байтах, а не в символах — иначе 40-символьный
+    кириллический пароль (< 72 символов, но 80 байт) прошёл бы мимо guard'а.
+    """
+    long_cyrillic_password = "а" * 40
+    assert len(long_cyrillic_password.encode("utf-8")) == 80
+    with pytest.raises(ValueError):
+        hash_password(long_cyrillic_password)
+
+
+def test_verify_too_long_returns_false_not_raise() -> None:
+    """verify_password на >72-байтовом пароле возвращает False, НЕ raise."""
+    hashed = hash_password("some valid password")
+    long_password = "a" * 73
+    assert verify_password(long_password, hashed) is False
+
+
+def test_hash_empty_raises_value_error() -> None:
+    """Пустой пароль → ValueError в hash_password."""
+    with pytest.raises(ValueError):
+        hash_password("")
+
+
+def test_verify_empty_returns_false() -> None:
+    """Пустой пароль в verify_password → False (не raise)."""
+    hashed = hash_password("some valid password")
+    assert verify_password("", hashed) is False
+
+
+def test_hash_is_unique_due_to_salt() -> None:
+    """Два хеша одного пароля различаются (уникальная соль на каждый вызов)."""
+    password = "correct horse battery staple"
+    hash1 = hash_password(password)
+    hash2 = hash_password(password)
+    assert hash1 != hash2
+    assert verify_password(password, hash1) is True
+    assert verify_password(password, hash2) is True
+
+
+def test_verify_malformed_hash_returns_false() -> None:
+    """Некорректный (не-bcrypt) хеш в verify_password → False, не raise."""
+    assert verify_password("some password", "not-a-bcrypt-hash") is False
--- a/tradein-mvp/uv.lock
+++ b/tradein-mvp/uv.lock
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 name = "brotli"
 version = "1.2.0"
@ -1609,6 +1675,7 @@ name = "tradein-mvp-backend"
 version = "0.1.0"
 source = { virtual = "backend" }
 dependencies = [
+    { name = "bcrypt" },
    { name = "curl-cffi" },
    { name = "fastapi" },
    { name = "geoalchemy2" },
@ -1644,6 +1711,7 @@ dev = [

 [package.metadata]
 requires-dist = [
+    { name = "bcrypt", specifier = ">=4.2.0" },
    { name = "curl-cffi", specifier = ">=0.7.0" },
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