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79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
"""
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Proxy requests to avoid SSRF
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"""
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import logging
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import os
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import time
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import httpx
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SSRF_PROXY_ALL_URL = os.getenv("SSRF_PROXY_ALL_URL", "")
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SSRF_PROXY_HTTP_URL = os.getenv("SSRF_PROXY_HTTP_URL", "")
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SSRF_PROXY_HTTPS_URL = os.getenv("SSRF_PROXY_HTTPS_URL", "")
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SSRF_DEFAULT_MAX_RETRIES = int(os.getenv("SSRF_DEFAULT_MAX_RETRIES", "3"))
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proxies = (
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{"http://": SSRF_PROXY_HTTP_URL, "https://": SSRF_PROXY_HTTPS_URL}
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if SSRF_PROXY_HTTP_URL and SSRF_PROXY_HTTPS_URL
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else None
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)
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BACKOFF_FACTOR = 0.5
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STATUS_FORCELIST = [429, 500, 502, 503, 504]
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def make_request(method, url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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if "allow_redirects" in kwargs:
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allow_redirects = kwargs.pop("allow_redirects")
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if "follow_redirects" not in kwargs:
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kwargs["follow_redirects"] = allow_redirects
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retries = 0
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while retries <= max_retries:
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try:
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if SSRF_PROXY_ALL_URL:
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response = httpx.request(method=method, url=url, proxy=SSRF_PROXY_ALL_URL, **kwargs)
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elif proxies:
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response = httpx.request(method=method, url=url, proxies=proxies, **kwargs)
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else:
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response = httpx.request(method=method, url=url, **kwargs)
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if response.status_code not in STATUS_FORCELIST:
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return response
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else:
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logging.warning(f"Received status code {response.status_code} for URL {url} which is in the force list")
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except httpx.RequestError as e:
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logging.warning(f"Request to URL {url} failed on attempt {retries + 1}: {e}")
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retries += 1
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if retries <= max_retries:
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time.sleep(BACKOFF_FACTOR * (2 ** (retries - 1)))
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raise Exception(f"Reached maximum retries ({max_retries}) for URL {url}")
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def get(url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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return make_request("GET", url, max_retries=max_retries, **kwargs)
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def post(url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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return make_request("POST", url, max_retries=max_retries, **kwargs)
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def put(url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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return make_request("PUT", url, max_retries=max_retries, **kwargs)
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def patch(url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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return make_request("PATCH", url, max_retries=max_retries, **kwargs)
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def delete(url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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return make_request("DELETE", url, max_retries=max_retries, **kwargs)
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def head(url, max_retries=SSRF_DEFAULT_MAX_RETRIES, **kwargs):
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return make_request("HEAD", url, max_retries=max_retries, **kwargs)
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