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455 lines
16 KiB
Python
455 lines
16 KiB
Python
2 years ago
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"""PipSession and supporting code, containing all pip-specific
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network request configuration and behavior.
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"""
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# When mypy runs on Windows the call to distro.linux_distribution() is skipped
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# resulting in the failure:
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#
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# error: unused 'type: ignore' comment
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#
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# If the upstream module adds typing, this comment should be removed. See
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# https://github.com/nir0s/distro/pull/269
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#
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# mypy: warn-unused-ignores=False
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import email.utils
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import ipaddress
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import json
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import logging
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import mimetypes
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import os
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import platform
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import shutil
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import subprocess
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import sys
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import urllib.parse
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import warnings
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from typing import Any, Dict, Iterator, List, Mapping, Optional, Sequence, Tuple, Union
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from pip._vendor import requests, urllib3
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from pip._vendor.cachecontrol import CacheControlAdapter
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from pip._vendor.requests.adapters import BaseAdapter, HTTPAdapter
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from pip._vendor.requests.models import PreparedRequest, Response
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from pip._vendor.requests.structures import CaseInsensitiveDict
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from pip._vendor.urllib3.connectionpool import ConnectionPool
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from pip._vendor.urllib3.exceptions import InsecureRequestWarning
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from pip import __version__
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from pip._internal.metadata import get_default_environment
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from pip._internal.models.link import Link
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from pip._internal.network.auth import MultiDomainBasicAuth
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from pip._internal.network.cache import SafeFileCache
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# Import ssl from compat so the initial import occurs in only one place.
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from pip._internal.utils.compat import has_tls
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from pip._internal.utils.glibc import libc_ver
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from pip._internal.utils.misc import build_url_from_netloc, parse_netloc
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from pip._internal.utils.urls import url_to_path
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logger = logging.getLogger(__name__)
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SecureOrigin = Tuple[str, str, Optional[Union[int, str]]]
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# Ignore warning raised when using --trusted-host.
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warnings.filterwarnings("ignore", category=InsecureRequestWarning)
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SECURE_ORIGINS: List[SecureOrigin] = [
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# protocol, hostname, port
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# Taken from Chrome's list of secure origins (See: http://bit.ly/1qrySKC)
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("https", "*", "*"),
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("*", "localhost", "*"),
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("*", "127.0.0.0/8", "*"),
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("*", "::1/128", "*"),
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("file", "*", None),
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# ssh is always secure.
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("ssh", "*", "*"),
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]
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# These are environment variables present when running under various
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# CI systems. For each variable, some CI systems that use the variable
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# are indicated. The collection was chosen so that for each of a number
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# of popular systems, at least one of the environment variables is used.
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# This list is used to provide some indication of and lower bound for
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# CI traffic to PyPI. Thus, it is okay if the list is not comprehensive.
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# For more background, see: https://github.com/pypa/pip/issues/5499
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CI_ENVIRONMENT_VARIABLES = (
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# Azure Pipelines
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"BUILD_BUILDID",
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# Jenkins
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"BUILD_ID",
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# AppVeyor, CircleCI, Codeship, Gitlab CI, Shippable, Travis CI
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"CI",
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# Explicit environment variable.
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"PIP_IS_CI",
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)
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def looks_like_ci() -> bool:
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"""
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Return whether it looks like pip is running under CI.
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"""
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# We don't use the method of checking for a tty (e.g. using isatty())
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# because some CI systems mimic a tty (e.g. Travis CI). Thus that
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# method doesn't provide definitive information in either direction.
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return any(name in os.environ for name in CI_ENVIRONMENT_VARIABLES)
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def user_agent() -> str:
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"""
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Return a string representing the user agent.
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"""
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data: Dict[str, Any] = {
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"installer": {"name": "pip", "version": __version__},
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"python": platform.python_version(),
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"implementation": {
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"name": platform.python_implementation(),
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},
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}
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if data["implementation"]["name"] == "CPython":
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data["implementation"]["version"] = platform.python_version()
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elif data["implementation"]["name"] == "PyPy":
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pypy_version_info = sys.pypy_version_info # type: ignore
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if pypy_version_info.releaselevel == "final":
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pypy_version_info = pypy_version_info[:3]
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data["implementation"]["version"] = ".".join(
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[str(x) for x in pypy_version_info]
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)
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elif data["implementation"]["name"] == "Jython":
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# Complete Guess
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data["implementation"]["version"] = platform.python_version()
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elif data["implementation"]["name"] == "IronPython":
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# Complete Guess
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data["implementation"]["version"] = platform.python_version()
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if sys.platform.startswith("linux"):
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from pip._vendor import distro
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# https://github.com/nir0s/distro/pull/269
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linux_distribution = distro.linux_distribution() # type: ignore
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distro_infos = dict(
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filter(
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lambda x: x[1],
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zip(["name", "version", "id"], linux_distribution),
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)
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)
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libc = dict(
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filter(
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lambda x: x[1],
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zip(["lib", "version"], libc_ver()),
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)
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)
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if libc:
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distro_infos["libc"] = libc
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if distro_infos:
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data["distro"] = distro_infos
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if sys.platform.startswith("darwin") and platform.mac_ver()[0]:
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data["distro"] = {"name": "macOS", "version": platform.mac_ver()[0]}
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if platform.system():
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data.setdefault("system", {})["name"] = platform.system()
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if platform.release():
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data.setdefault("system", {})["release"] = platform.release()
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if platform.machine():
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data["cpu"] = platform.machine()
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if has_tls():
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import _ssl as ssl
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data["openssl_version"] = ssl.OPENSSL_VERSION
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setuptools_dist = get_default_environment().get_distribution("setuptools")
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if setuptools_dist is not None:
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data["setuptools_version"] = str(setuptools_dist.version)
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if shutil.which("rustc") is not None:
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# If for any reason `rustc --version` fails, silently ignore it
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try:
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rustc_output = subprocess.check_output(
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["rustc", "--version"], stderr=subprocess.STDOUT, timeout=0.5
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)
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except Exception:
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pass
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else:
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if rustc_output.startswith(b"rustc "):
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# The format of `rustc --version` is:
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# `b'rustc 1.52.1 (9bc8c42bb 2021-05-09)\n'`
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# We extract just the middle (1.52.1) part
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data["rustc_version"] = rustc_output.split(b" ")[1].decode()
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# Use None rather than False so as not to give the impression that
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# pip knows it is not being run under CI. Rather, it is a null or
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# inconclusive result. Also, we include some value rather than no
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# value to make it easier to know that the check has been run.
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data["ci"] = True if looks_like_ci() else None
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user_data = os.environ.get("PIP_USER_AGENT_USER_DATA")
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if user_data is not None:
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data["user_data"] = user_data
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return "{data[installer][name]}/{data[installer][version]} {json}".format(
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data=data,
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json=json.dumps(data, separators=(",", ":"), sort_keys=True),
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)
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class LocalFSAdapter(BaseAdapter):
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def send(
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self,
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request: PreparedRequest,
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stream: bool = False,
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timeout: Optional[Union[float, Tuple[float, float]]] = None,
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verify: Union[bool, str] = True,
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cert: Optional[Union[str, Tuple[str, str]]] = None,
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proxies: Optional[Mapping[str, str]] = None,
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) -> Response:
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pathname = url_to_path(request.url)
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resp = Response()
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resp.status_code = 200
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resp.url = request.url
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try:
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stats = os.stat(pathname)
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except OSError as exc:
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resp.status_code = 404
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resp.raw = exc
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else:
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modified = email.utils.formatdate(stats.st_mtime, usegmt=True)
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content_type = mimetypes.guess_type(pathname)[0] or "text/plain"
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resp.headers = CaseInsensitiveDict(
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{
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"Content-Type": content_type,
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"Content-Length": stats.st_size,
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"Last-Modified": modified,
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}
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)
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resp.raw = open(pathname, "rb")
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resp.close = resp.raw.close
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return resp
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def close(self) -> None:
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pass
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class InsecureHTTPAdapter(HTTPAdapter):
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def cert_verify(
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self,
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conn: ConnectionPool,
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url: str,
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verify: Union[bool, str],
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cert: Optional[Union[str, Tuple[str, str]]],
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) -> None:
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super().cert_verify(conn=conn, url=url, verify=False, cert=cert)
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class InsecureCacheControlAdapter(CacheControlAdapter):
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def cert_verify(
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self,
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conn: ConnectionPool,
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url: str,
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verify: Union[bool, str],
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cert: Optional[Union[str, Tuple[str, str]]],
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) -> None:
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super().cert_verify(conn=conn, url=url, verify=False, cert=cert)
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class PipSession(requests.Session):
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timeout: Optional[int] = None
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def __init__(
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self,
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*args: Any,
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retries: int = 0,
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cache: Optional[str] = None,
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trusted_hosts: Sequence[str] = (),
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index_urls: Optional[List[str]] = None,
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**kwargs: Any,
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) -> None:
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"""
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:param trusted_hosts: Domains not to emit warnings for when not using
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HTTPS.
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"""
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super().__init__(*args, **kwargs)
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# Namespace the attribute with "pip_" just in case to prevent
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# possible conflicts with the base class.
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self.pip_trusted_origins: List[Tuple[str, Optional[int]]] = []
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# Attach our User Agent to the request
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self.headers["User-Agent"] = user_agent()
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# Attach our Authentication handler to the session
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self.auth = MultiDomainBasicAuth(index_urls=index_urls)
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# Create our urllib3.Retry instance which will allow us to customize
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# how we handle retries.
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retries = urllib3.Retry(
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# Set the total number of retries that a particular request can
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# have.
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total=retries,
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# A 503 error from PyPI typically means that the Fastly -> Origin
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# connection got interrupted in some way. A 503 error in general
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# is typically considered a transient error so we'll go ahead and
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# retry it.
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# A 500 may indicate transient error in Amazon S3
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# A 520 or 527 - may indicate transient error in CloudFlare
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status_forcelist=[500, 503, 520, 527],
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# Add a small amount of back off between failed requests in
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# order to prevent hammering the service.
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backoff_factor=0.25,
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) # type: ignore
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# Our Insecure HTTPAdapter disables HTTPS validation. It does not
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# support caching so we'll use it for all http:// URLs.
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# If caching is disabled, we will also use it for
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# https:// hosts that we've marked as ignoring
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# TLS errors for (trusted-hosts).
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insecure_adapter = InsecureHTTPAdapter(max_retries=retries)
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# We want to _only_ cache responses on securely fetched origins or when
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# the host is specified as trusted. We do this because
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# we can't validate the response of an insecurely/untrusted fetched
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# origin, and we don't want someone to be able to poison the cache and
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# require manual eviction from the cache to fix it.
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if cache:
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secure_adapter = CacheControlAdapter(
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cache=SafeFileCache(cache),
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max_retries=retries,
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)
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self._trusted_host_adapter = InsecureCacheControlAdapter(
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cache=SafeFileCache(cache),
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max_retries=retries,
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)
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else:
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secure_adapter = HTTPAdapter(max_retries=retries)
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self._trusted_host_adapter = insecure_adapter
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self.mount("https://", secure_adapter)
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self.mount("http://", insecure_adapter)
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# Enable file:// urls
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self.mount("file://", LocalFSAdapter())
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for host in trusted_hosts:
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self.add_trusted_host(host, suppress_logging=True)
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def update_index_urls(self, new_index_urls: List[str]) -> None:
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"""
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:param new_index_urls: New index urls to update the authentication
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handler with.
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"""
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self.auth.index_urls = new_index_urls
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def add_trusted_host(
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self, host: str, source: Optional[str] = None, suppress_logging: bool = False
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) -> None:
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"""
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:param host: It is okay to provide a host that has previously been
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added.
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:param source: An optional source string, for logging where the host
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string came from.
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"""
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if not suppress_logging:
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msg = f"adding trusted host: {host!r}"
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if source is not None:
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msg += f" (from {source})"
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logger.info(msg)
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host_port = parse_netloc(host)
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if host_port not in self.pip_trusted_origins:
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|
|
self.pip_trusted_origins.append(host_port)
|
||
|
|
|
||
|
|
self.mount(build_url_from_netloc(host) + "/", self._trusted_host_adapter)
|
||
|
|
if not host_port[1]:
|
||
|
|
# Mount wildcard ports for the same host.
|
||
|
|
self.mount(build_url_from_netloc(host) + ":", self._trusted_host_adapter)
|
||
|
|
|
||
|
|
def iter_secure_origins(self) -> Iterator[SecureOrigin]:
|
||
|
|
yield from SECURE_ORIGINS
|
||
|
|
for host, port in self.pip_trusted_origins:
|
||
|
|
yield ("*", host, "*" if port is None else port)
|
||
|
|
|
||
|
|
def is_secure_origin(self, location: Link) -> bool:
|
||
|
|
# Determine if this url used a secure transport mechanism
|
||
|
|
parsed = urllib.parse.urlparse(str(location))
|
||
|
|
origin_protocol, origin_host, origin_port = (
|
||
|
|
parsed.scheme,
|
||
|
|
parsed.hostname,
|
||
|
|
parsed.port,
|
||
|
|
)
|
||
|
|
|
||
|
|
# The protocol to use to see if the protocol matches.
|
||
|
|
# Don't count the repository type as part of the protocol: in
|
||
|
|
# cases such as "git+ssh", only use "ssh". (I.e., Only verify against
|
||
|
|
# the last scheme.)
|
||
|
|
origin_protocol = origin_protocol.rsplit("+", 1)[-1]
|
||
|
|
|
||
|
|
# Determine if our origin is a secure origin by looking through our
|
||
|
|
# hardcoded list of secure origins, as well as any additional ones
|
||
|
|
# configured on this PackageFinder instance.
|
||
|
|
for secure_origin in self.iter_secure_origins():
|
||
|
|
secure_protocol, secure_host, secure_port = secure_origin
|
||
|
|
if origin_protocol != secure_protocol and secure_protocol != "*":
|
||
|
|
continue
|
||
|
|
|
||
|
|
try:
|
||
|
|
addr = ipaddress.ip_address(origin_host)
|
||
|
|
network = ipaddress.ip_network(secure_host)
|
||
|
|
except ValueError:
|
||
|
|
# We don't have both a valid address or a valid network, so
|
||
|
|
# we'll check this origin against hostnames.
|
||
|
|
if (
|
||
|
|
origin_host
|
||
|
|
and origin_host.lower() != secure_host.lower()
|
||
|
|
and secure_host != "*"
|
||
|
|
):
|
||
|
|
continue
|
||
|
|
else:
|
||
|
|
# We have a valid address and network, so see if the address
|
||
|
|
# is contained within the network.
|
||
|
|
if addr not in network:
|
||
|
|
continue
|
||
|
|
|
||
|
|
# Check to see if the port matches.
|
||
|
|
if (
|
||
|
|
origin_port != secure_port
|
||
|
|
and secure_port != "*"
|
||
|
|
and secure_port is not None
|
||
|
|
):
|
||
|
|
continue
|
||
|
|
|
||
|
|
# If we've gotten here, then this origin matches the current
|
||
|
|
# secure origin and we should return True
|
||
|
|
return True
|
||
|
|
|
||
|
|
# If we've gotten to this point, then the origin isn't secure and we
|
||
|
|
# will not accept it as a valid location to search. We will however
|
||
|
|
# log a warning that we are ignoring it.
|
||
|
|
logger.warning(
|
||
|
|
"The repository located at %s is not a trusted or secure host and "
|
||
|
|
"is being ignored. If this repository is available via HTTPS we "
|
||
|
|
"recommend you use HTTPS instead, otherwise you may silence "
|
||
|
|
"this warning and allow it anyway with '--trusted-host %s'.",
|
||
|
|
origin_host,
|
||
|
|
origin_host,
|
||
|
|
)
|
||
|
|
|
||
|
|
return False
|
||
|
|
|
||
|
|
def request(self, method: str, url: str, *args: Any, **kwargs: Any) -> Response:
|
||
|
|
# Allow setting a default timeout on a session
|
||
|
|
kwargs.setdefault("timeout", self.timeout)
|
||
|
|
|
||
|
|
# Dispatch the actual request
|
||
|
|
return super().request(method, url, *args, **kwargs)
|