mirror of https://github.com/Nezreka/SoulSync.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
2.6 KiB
61 lines
2.6 KiB
"""Opt-in reverse-proxy mode.
|
|
|
|
Default OFF. When off this is a strict no-op: the Flask app is left exactly as it
|
|
was, ``X-Forwarded-*`` headers are NOT trusted (so a direct client can't spoof its
|
|
IP/scheme), and the session cookie keeps Flask's defaults. So a normal direct /
|
|
LAN install is byte-for-byte unchanged.
|
|
|
|
Only when the operator explicitly sets ``security.trust_reverse_proxy: true`` —
|
|
they're running behind nginx / Caddy / Traefik that terminates TLS — do we:
|
|
- trust the proxy's ``X-Forwarded-For/Proto/Host/Port`` (correct client IP,
|
|
HTTPS detection, redirects), and
|
|
- mark the session cookie ``Secure`` (HTTPS-only) + ``SameSite=Lax``.
|
|
|
|
Gated this way the security/UX change is scoped strictly to people who turned it
|
|
on; everyone else is untouched.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
CONFIG_KEY = "security.trust_reverse_proxy"
|
|
|
|
|
|
def apply_reverse_proxy_mode(app, config_get) -> bool:
|
|
"""Apply reverse-proxy hardening to ``app`` iff the operator enabled it.
|
|
|
|
``config_get`` is a ``config_manager.get``-style callable ``(key, default)``.
|
|
Returns True if proxy mode was enabled, False (no-op) otherwise. Never raises
|
|
out — a failure to enable falls back to the safe no-op behaviour.
|
|
"""
|
|
try:
|
|
if not config_get(CONFIG_KEY, False):
|
|
return False
|
|
from werkzeug.middleware.proxy_fix import ProxyFix
|
|
# Trust exactly one proxy hop for each forwarded header.
|
|
app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1, x_port=1)
|
|
app.config["SESSION_COOKIE_SECURE"] = True
|
|
app.config["SESSION_COOKIE_SAMESITE"] = "Lax"
|
|
|
|
# Security headers — registered ONLY in proxy mode (so a direct/LAN install
|
|
# gets none of them). Conservative set that won't break a same-origin app:
|
|
# nosniff, clickjacking protection, and HSTS (safe: only honoured over the
|
|
# HTTPS the proxy terminates). No CSP here — it needs per-deployment tuning
|
|
# and is better added at the proxy. setdefault() so we never clobber a
|
|
# header the proxy already set.
|
|
@app.after_request
|
|
def _security_headers(response):
|
|
response.headers.setdefault("X-Content-Type-Options", "nosniff")
|
|
response.headers.setdefault("X-Frame-Options", "SAMEORIGIN")
|
|
response.headers.setdefault(
|
|
"Strict-Transport-Security", "max-age=31536000; includeSubDomains"
|
|
)
|
|
return response
|
|
|
|
return True
|
|
except Exception:
|
|
# If anything goes wrong, behave like off — never break startup over this.
|
|
return False
|
|
|
|
|
|
__all__ = ["apply_reverse_proxy_mode", "CONFIG_KEY"]
|