fix(security): funnel公网流量强制校验API_KEY双保险(Tailscale-Funnel-Request头,不可伪造)

app/core/security.py

@@ -55,13 +55,17 @@ def _is_trusted(ip: str) -> bool:
     return any(addr in net for net in TRUSTED_NETWORKS)
 
 
-async def require_api_key(
-    request: Request,
-    x_api_key: Optional[str] = Header(default=None, alias="X-API-Key"),
-) -> None:
-    """校验 API Key：Tailscale 内网/本机放行，外部来源必须携带有效 Key"""
-    if _is_trusted(_client_ip(request)):
-        return
+def _is_funnel_request(request: Request) -> bool:
+    """判断是否 tailscale funnel 公网流量
+
+    tailscale serve 转发时会把客户端伪造的 Tailscale-* 头清空后按真实
+    情况设置：tailnet 内无此头，funnel 公网流量为 "?1"（不可伪造）。
+    """
+    return request.headers.get("tailscale-funnel-request") == "?1"
+
+
+async def _require_key(x_api_key: Optional[str]) -> None:
+    """按外部来源校验 API Key（可信内网已在调用方排除）"""
     if not settings.API_KEY:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
@@ -74,6 +78,20 @@ async def require_api_key(
         )
 
 
+async def require_api_key(
+    request: Request,
+    x_api_key: Optional[str] = Header(default=None, alias="X-API-Key"),
+) -> None:
+    """校验 API Key：Tailscale 内网/本机放行，外部来源必须携带有效 Key"""
+    # funnel 公网流量：即使来源 IP 恰在 tailnet 网段也强制校验（双保险）
+    if _is_funnel_request(request):
+        await _require_key(x_api_key)
+        return
+    if _is_trusted(_client_ip(request)):
+        return
+    await _require_key(x_api_key)
+
+
 async def require_agent_key(
     x_agent_key: Optional[str] = Header(default=None, alias="X-Agent-Key"),
 ) -> None: