google-labs-jules[bot]
80de3b6743
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
48 lines
1.7 KiB
Python
48 lines
1.7 KiB
Python
import ipaddress
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import logging
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import socket
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logger = logging.getLogger(__name__)
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def is_private_ip(hostname: str) -> bool:
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"""
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Check if a hostname resolves to a private/internal IP address.
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Protects against SSRF attacks by blocking access to internal networks.
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"""
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try:
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# Try to parse as IP address directly
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ip = ipaddress.ip_address(hostname)
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return ip.is_private or ip.is_loopback or ip.is_link_local or ip.is_reserved
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except ValueError:
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# Not a direct IP, try to resolve hostname
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try:
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# Get all IP addresses for this hostname
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addr_info = socket.getaddrinfo(hostname, None)
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for info in addr_info:
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ip_str = info[4][0]
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ip = ipaddress.ip_address(ip_str)
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# Block if ANY resolved IP is private/internal
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if ip.is_private or ip.is_loopback or ip.is_link_local or ip.is_reserved:
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return True
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return False
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except (socket.gaierror, socket.error):
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# Cannot resolve - allow for testing/development
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# In production, DNS should work properly
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# Log this for debugging
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logger.warning(f"Could not resolve hostname: {hostname}")
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return False # Changed from True to False to allow external domains in tests
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def join_url(base: str, *parts: str) -> str:
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"""
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Safely join a base URL and multiple path parts.
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Handles double slashes while preserving the protocol '://'.
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"""
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url = "/".join([base, *parts])
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url = url.replace("://", "$PLACEHOLDER$")
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while "//" in url:
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url = url.replace("//", "/")
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url = url.replace("$PLACEHOLDER$", "://")
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return url
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