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"""Safe outbound HTTP fetching for LLM tools."""
from __future__ import annotations
import ipaddress
import socket
import httpx
from ...config import settings
_METADATA_IPS = {
ipaddress.ip_address("169.254.169.254"),
}
class UnsafeURL(ValueError):
"""Raised when an outbound URL is not allowed."""
def _is_public_ip(ip: ipaddress.IPv4Address | ipaddress.IPv6Address) -> bool:
if ip in _METADATA_IPS:
return False
return not (
ip.is_private
or ip.is_loopback
or ip.is_link_local
or ip.is_multicast
or ip.is_reserved
or ip.is_unspecified
)
def validate_public_http_url(url: str) -> httpx.URL:
"""Return a parsed URL after rejecting private network targets."""
parsed = httpx.URL(url)
if parsed.scheme not in {"http", "https"}:
raise UnsafeURL("Only http(s) URLs are allowed.")
host = parsed.host
if not host:
raise UnsafeURL("URL host is required.")
if host.lower() == "localhost" or host.lower().endswith(".localhost"):
raise UnsafeURL("Localhost URLs are not allowed.")
try:
ip = ipaddress.ip_address(host)
if not _is_public_ip(ip):
raise UnsafeURL("Private or local IP addresses are not allowed.")
return parsed
except ValueError:
pass
try:
infos = socket.getaddrinfo(
host,
parsed.port or (443 if parsed.scheme == "https" else 80),
type=socket.SOCK_STREAM,
)
except socket.gaierror as exc:
raise UnsafeURL(f"Could not resolve host: {host}") from exc
addresses = {item[4][0] for item in infos}
if not addresses:
raise UnsafeURL(f"Could not resolve host: {host}")
for address in addresses:
ip = ipaddress.ip_address(address)
if not _is_public_ip(ip):
raise UnsafeURL("Resolved private or local IP addresses are not allowed.")
return parsed
def fetch_public_bytes(
url: str,
*,
max_bytes: int | None = None,
timeout: float | None = None,
) -> tuple[bytes, str, str]:
"""Fetch bytes from a public http(s) URL with redirect and size checks."""
limit = max_bytes or settings.max_fetch_mb * 1024 * 1024
current = validate_public_http_url(url)
headers = {"User-Agent": "ollama-web/0.1 (+https://github.com/local)"}
with httpx.Client(timeout=timeout or settings.scrape_timeout, headers=headers) as client:
for _ in range(6):
with client.stream("GET", current, follow_redirects=False) as resp:
if resp.is_redirect:
location = resp.headers.get("location")
if not location:
raise UnsafeURL("Redirect without Location header.")
current = validate_public_http_url(str(current.join(location)))
continue
resp.raise_for_status()
declared = resp.headers.get("content-length")
if declared and int(declared) > limit:
raise UnsafeURL("Remote response exceeds the configured size limit.")
chunks: list[bytes] = []
total = 0
for chunk in resp.iter_bytes():
total += len(chunk)
if total > limit:
raise UnsafeURL("Remote response exceeds the configured size limit.")
chunks.append(chunk)
content_type = resp.headers.get("content-type", "")
return b"".join(chunks), str(resp.url), content_type
raise UnsafeURL("Too many redirects.")
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