leetcrypt
2c4a4f9a22
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M1: enforce the declared transfer size (clamped to MAX_SIZE) on chunk receipt in both the Rust and Python clients — a malicious sender can no longer grow the receive buffer unboundedly. M2: only honor X-Forwarded-For when TRUST_PROXY is set, so a direct client can't spoof a source IP to dodge the per-IP rate limiter. M3: evict unverified SRP sessions after a 60s TTL on each new handshake, preventing half-finished auths from exhausting memory. M4: drop WS frames larger than 256 KB before they hit the store or broadcast, bounding per-message memory and flood blast radius. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
import os
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import time
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from collections import defaultdict
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from datetime import datetime, timezone
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from dataclasses import asdict
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import json
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from sanic import Request, Sanic, Websocket
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def utcnow() -> datetime:
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return datetime.now(timezone.utc)
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# Only honor X-Forwarded-For when explicitly told we sit behind a trusted proxy
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# (TRUST_PROXY=1). Otherwise a direct client can spoof the header to forge a
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# source IP and dodge the per-IP rate limiter, so we use the real peer address.
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_TRUST_PROXY = os.environ.get("TRUST_PROXY", "").lower() in ("1", "true", "yes")
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def get_client_ip(request: Request) -> str:
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if _TRUST_PROXY:
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if forwarded := request.headers.get("x-forwarded-for"):
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return forwarded.split(",")[0].strip()
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return request.ip
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async def send_state(ws: Websocket, app: Sanic) -> None:
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messages = app.ctx.message_store.get_all()
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users = app.ctx.session_store.get_all()
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await ws.send(
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json.dumps(
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{
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"type": "init",
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"messages": [asdict(m) for m in messages],
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"users": [
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{"user_id": u.user_id, "username": u.username} for u in users
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],
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}
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)
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)
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class RateLimiter:
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def __init__(self, max_requests: int = 10, window_seconds: int = 60):
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self.max_requests = max_requests
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self.window = window_seconds
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self._requests: dict[str, list[float]] = defaultdict(list)
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def is_allowed(self, key: str) -> bool:
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now = time.monotonic()
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timestamps = self._requests[key]
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timestamps[:] = [t for t in timestamps if now - t < self.window]
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if len(timestamps) >= self.max_requests:
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return False
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timestamps.append(now)
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return True
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