curo1305andClaude Sonnet 4.6
b0d2406acd
Add the 10.0.0.0/8 RFC-1918 block to _TRUSTED_PROXY_NETS so reverse proxies in cloud VPCs and Kubernetes clusters are recognized. Without this, X-Forwarded-For was silently ignored for any proxy on a 10.x.x.x address, logging all requests as originating from the proxy IP. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
"""Shared dependency utilities — request parsing helpers used across all API routers."""
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from __future__ import annotations
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import ipaddress
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import uuid
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from typing import Optional
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from fastapi import HTTPException, Request
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_TRUSTED_PROXY_NETS = [
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ipaddress.ip_network("10.0.0.0/8"),
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ipaddress.ip_network("127.0.0.0/8"),
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ipaddress.ip_network("172.16.0.0/12"),
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ipaddress.ip_network("192.168.0.0/16"),
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ipaddress.ip_network("::1/128"),
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]
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def _is_trusted_proxy(host: str) -> bool:
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try:
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addr = ipaddress.ip_address(host)
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return any(addr in net for net in _TRUSTED_PROXY_NETS)
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except ValueError:
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return False
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def get_client_ip(request: Request) -> Optional[str]:
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"""Extract best-effort client IP from request for audit logging (D-11 — trusted-proxy CIDR check).
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Only honours X-Forwarded-For when the direct peer is a known trusted proxy
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(RFC-1918 / loopback). Untrusted direct peers always return their own address,
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preventing XFF spoofing by external callers.
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TRUST BOUNDARY: this value is used for forensic audit logging only —
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not for authentication or access control decisions.
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"""
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direct_peer = request.client.host if request.client else None
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if direct_peer and _is_trusted_proxy(direct_peer):
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xff = request.headers.get("X-Forwarded-For")
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if xff:
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return xff.split(",")[0].strip()
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return direct_peer
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def parse_uuid(value: str, detail: str = "Not found") -> uuid.UUID:
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"""Parse *value* as a UUID, raising HTTP 404 with *detail* on failure.
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Use at API boundaries to convert path/body string IDs to UUID objects.
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Returns the parsed UUID so callers can use it directly without a try/except.
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"""
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try:
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return uuid.UUID(value)
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except ValueError:
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raise HTTPException(status_code=404, detail=detail)
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