copilot-swe-agent[bot]
15dd1a8471
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com> Agent-Logs-Url: https://github.com/christianlouis/DocuElevate/sessions/54fd29b1-b600-4e60-aa0a-a069836ad129
61 lines
2.4 KiB
Python
61 lines
2.4 KiB
Python
import ipaddress
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import logging
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import socket
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from urllib.parse import urlsplit, urlunsplit
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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.
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# Fail securely: block unresolved domains to prevent DNS rebinding
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# and SSRF bypasses via unresolvable addresses.
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logger.warning(f"Could not resolve hostname (blocking securely): {hostname}")
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return True
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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 with one or more path parts.
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Uses urllib.parse to correctly handle scheme/netloc/query/fragment so that
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only the path component is modified. Leading and trailing slashes are
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stripped from each part before joining, preventing double-slash sequences
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at segment boundaries without touching the scheme separator or query string.
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Examples:
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join_url("https://example.com/dav/", "/remote/", "file.pdf")
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-> "https://example.com/dav/remote/file.pdf"
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"""
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parsed = urlsplit(base)
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# Strip each part once and filter out empty segments; use walrus operator
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# to avoid calling strip twice per iteration.
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stripped_parts = [s for p in parts if (s := p.strip("/"))]
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base_path = parsed.path.rstrip("/")
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new_path = base_path + "/" + "/".join(stripped_parts) if stripped_parts else base_path
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# Ensure path is non-empty so the reconstructed URL is valid.
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if not new_path:
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new_path = "/"
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return urlunsplit((parsed.scheme, parsed.netloc, new_path, parsed.query, parsed.fragment))
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