fix(securitate): inchide nit-urile din review-ul hardening (N1-N3)

- N1: test HSTS pe monkeypatch.setenv (fara env var scursa la assert picat)
- N2: backup_db.sh refuza AUTOPASS_BACKUP_KEEP < 1 (retentia ar fi sters
  backup-ul abia creat)
- N3: teste ASGI directe pentru Content-Length malformat/negativ in
  BodyCapMiddleware (comportamentul defensiv exista deja, acum e fixat in teste)

Suita completa: 1559 passed, 1 skipped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_body_cap.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import asyncio
 import io
 import json
 import os
@@ -10,6 +11,8 @@ import tempfile
 import pytest
 from fastapi.testclient import TestClient
 
+from app.web.body_cap import BodyCapMiddleware
+
 
 @pytest.fixture()
 def client(monkeypatch):
@@ -62,3 +65,67 @@ def test_content_length_mare_body_mic_413_devreme(client):
     )
     assert r.status_code == 413
     assert r.json()["cod"] == "CERERE_PREA_MARE"
+
+
+async def _dummy_app(scope, receive, send):
+    """App ASGI minimal: consuma tot body-ul (ca un endpoint real), apoi 200."""
+    more_body = True
+    while more_body:
+        message = await receive()
+        more_body = message.get("more_body", False)
+    await send({"type": "http.response.start", "status": 200, "headers": []})
+    await send({"type": "http.response.body", "body": b"ok"})
+
+
+def _run_body_cap(headers, body_chunks):
+    """Ruleaza BodyCapMiddleware direct pe un scope/receive/send ASGI construit manual
+    (TestClient/httpx nu lasa Content-Length malformat/negativ sa treaca la request real)."""
+    scope = {"type": "http", "method": "POST", "path": "/x", "headers": headers}
+    chunks = list(body_chunks)
+
+    async def receive():
+        if not chunks:
+            return {"type": "http.request", "body": b"", "more_body": False}
+        body, more = chunks.pop(0)
+        return {"type": "http.request", "body": body, "more_body": more}
+
+    messages = []
+
+    async def send(message):
+        messages.append(message)
+
+    async def run():
+        await BodyCapMiddleware(_dummy_app)(scope, receive, send)
+
+    asyncio.run(run())
+    return next(m["status"] for m in messages if m["type"] == "http.response.start")
+
+
+def test_content_length_malformat_nu_crapa(monkeypatch):
+    monkeypatch.setenv("AUTOPASS_MAX_REQUEST_BYTES", "1000")
+    from app.config import get_settings
+
+    get_settings.cache_clear()
+    try:
+        status = _run_body_cap(
+            headers=[(b"content-length", b"abc")],
+            body_chunks=[(b"body mic", False)],
+        )
+        assert status == 200
+    finally:
+        get_settings.cache_clear()
+
+
+def test_content_length_negativ_nu_crapa_dar_plafonul_ramane_aplicat(monkeypatch):
+    monkeypatch.setenv("AUTOPASS_MAX_REQUEST_BYTES", "1000")
+    from app.config import get_settings
+
+    get_settings.cache_clear()
+    try:
+        status = _run_body_cap(
+            headers=[(b"content-length", b"-5")],
+            body_chunks=[(b"x" * 2000, False)],
+        )
+        assert status == 413
+    finally:
+        get_settings.cache_clear()

tests/test_security_headers.py

@@ -45,11 +45,9 @@ def test_hsts_absent_pe_http(client):
     assert "Strict-Transport-Security" not in r.headers
 
 
-def test_hsts_prezent_pe_https():
+def test_hsts_prezent_pe_https(monkeypatch):
     tmp = tempfile.mkdtemp()
-    import os as _os
-
-    _os.environ["AUTOPASS_DB_PATH"] = _os.path.join(tmp, "sh_https.db")
+    monkeypatch.setenv("AUTOPASS_DB_PATH", os.path.join(tmp, "sh_https.db"))
     from app.config import get_settings
     get_settings.cache_clear()
     from app.main import app
@@ -61,4 +59,3 @@ def test_hsts_prezent_pe_https():
             "max-age=31536000; includeSubDomains"
         )
     get_settings.cache_clear()
-    _os.environ.pop("AUTOPASS_DB_PATH", None)

tools/backup_db.sh

@@ -32,6 +32,12 @@ RCLONE_REMOTE="${AUTOPASS_BACKUP_RCLONE_REMOTE:-}"
 log() { echo "[backup_db] $*"; }
 err() { echo "[backup_db] EROARE: $*" >&2; }
 
+if ! [[ "$KEEP" =~ ^[0-9]+$ ]] || [[ "$KEEP" -lt 1 ]]; then
+    err "AUTOPASS_BACKUP_KEEP trebuie sa fie un numar intreg >= 1 (primit: '$KEEP')."
+    err "cu KEEP=0 retentia ar sterge inclusiv backup-ul abia creat."
+    exit 1
+fi
+
 CLEANUP_PATHS=()
 cleanup() {
     local p