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"""Network Authentication Helpers
Contains interface (MultiDomainBasicAuth) and associated glue code for
providing credentials in the context of network requests.
"""
import urllib.parse
from typing import Any, Dict, List, Optional, Tuple
from pip._vendor.requests.auth import AuthBase, HTTPBasicAuth
from pip._vendor.requests.models import Request, Response
from pip._vendor.requests.utils import get_netrc_auth
from pip._internal.utils.logging import getLogger
from pip._internal.utils.misc import (
ask,
ask_input,
ask_password,
remove_auth_from_url,
split_auth_netloc_from_url,
)
from pip._internal.vcs.versioncontrol import AuthInfo
logger = getLogger(__name__)
Credentials = Tuple[str, str, str]
try:
import keyring
except ImportError:
keyring = None # type: ignore[assignment]
except Exception as exc:
logger.warning(
"Keyring is skipped due to an exception: %s",
str(exc),
)
keyring = None # type: ignore[assignment]
def get_keyring_auth(url: Optional[str], username: Optional[str]) -> Optional[AuthInfo]:
"""Return the tuple auth for a given url from keyring."""
global keyring
if not url or not keyring:
return None
try:
try:
get_credential = keyring.get_credential
except AttributeError:
pass
else:
logger.debug("Getting credentials from keyring for %s", url)
cred = get_credential(url, username)
if cred is not None:
return cred.username, cred.password
return None
if username:
logger.debug("Getting password from keyring for %s", url)
password = keyring.get_password(url, username)
if password:
return username, password
except Exception as exc:
logger.warning(
"Keyring is skipped due to an exception: %s",
str(exc),
)
keyring = None # type: ignore[assignment]
return None
class MultiDomainBasicAuth(AuthBase):
def __init__(
self, prompting: bool = True, index_urls: Optional[List[str]] = None
) -> None:
self.prompting = prompting
self.index_urls = index_urls
self.passwords: Dict[str, AuthInfo] = {}
# When the user is prompted to enter credentials and keyring is
# available, we will offer to save them. If the user accepts,
# this value is set to the credentials they entered. After the
# request authenticates, the caller should call
# ``save_credentials`` to save these.
self._credentials_to_save: Optional[Credentials] = None
def _get_index_url(self, url: str) -> Optional[str]:
"""Return the original index URL matching the requested URL.
Cached or dynamically generated credentials may work against
the original index URL rather than just the netloc.
The provided url should have had its username and password
removed already. If the original index url had credentials then
they will be included in the return value.
Returns None if no matching index was found, or if --no-index
was specified by the user.
"""
if not url or not self.index_urls:
return None
for u in self.index_urls:
prefix = remove_auth_from_url(u).rstrip("/") + "/"
if url.startswith(prefix):
return u
return None
def _get_new_credentials(
self,
original_url: str,
allow_netrc: bool = True,
allow_keyring: bool = False,
) -> AuthInfo:
"""Find and return credentials for the specified URL."""
# Split the credentials and netloc from the url.
url, netloc, url_user_password = split_auth_netloc_from_url(
original_url,
)
# Start with the credentials embedded in the url
username, password = url_user_password
if username is not None and password is not None:
logger.debug("Found credentials in url for %s", netloc)
return url_user_password
# Find a matching index url for this request
index_url = self._get_index_url(url)
if index_url:
# Split the credentials from the url.
index_info = split_auth_netloc_from_url(index_url)
if index_info:
index_url, _, index_url_user_password = index_info
logger.debug("Found index url %s", index_url)
# If an index URL was found, try its embedded credentials
if index_url and index_url_user_password[0] is not None:
username, password = index_url_user_password
if username is not None and password is not None:
logger.debug("Found credentials in index url for %s", netloc)
return index_url_user_password
# Get creds from netrc if we still don't have them
if allow_netrc:
netrc_auth = get_netrc_auth(original_url)
if netrc_auth:
logger.debug("Found credentials in netrc for %s", netloc)
return netrc_auth
# If we don't have a password and keyring is available, use it.
if allow_keyring:
# The index url is more specific than the netloc, so try it first
# fmt: off
kr_auth = (
get_keyring_auth(index_url, username) or
get_keyring_auth(netloc, username)
)
# fmt: on
if kr_auth:
logger.debug("Found credentials in keyring for %s", netloc)
return kr_auth
return username, password
def _get_url_and_credentials(
self, original_url: str
) -> Tuple[str, Optional[str], Optional[str]]:
"""Return the credentials to use for the provided URL.
If allowed, netrc and keyring may be used to obtain the
correct credentials.
Returns (url_without_credentials, username, password). Note
that even if the original URL contains credentials, this
function may return a different username and password.
"""
url, netloc, _ = split_auth_netloc_from_url(original_url)
# Try to get credentials from original url
username, password = self._get_new_credentials(original_url)
# If credentials not found, use any stored credentials for this netloc.
# Do this if either the username or the password is missing.
# This accounts for the situation in which the user has specified
# the username in the index url, but the password comes from keyring.
if (username is None or password is None) and netloc in self.passwords:
un, pw = self.passwords[netloc]
# It is possible that the cached credentials are for a different username,
# in which case the cache should be ignored.
if username is None or username == un:
username, password = un, pw
if username is not None or password is not None:
# Convert the username and password if they're None, so that
# this netloc will show up as "cached" in the conditional above.
# Further, HTTPBasicAuth doesn't accept None, so it makes sense to
# cache the value that is going to be used.
username = username or ""
password = password or ""
# Store any acquired credentials.
self.passwords[netloc] = (username, password)
assert (
# Credentials were found
(username is not None and password is not None)
# Credentials were not found
or (username is None and password is None)
), f"Could not load credentials from url: {original_url}"
return url, username, password
def __call__(self, req: Request) -> Request:
# Get credentials for this request
url, username, password = self._get_url_and_credentials(req.url)
# Set the url of the request to the url without any credentials
req.url = url
if username is not None and password is not None:
# Send the basic auth with this request
req = HTTPBasicAuth(username, password)(req)
# Attach a hook to handle 401 responses
req.register_hook("response", self.handle_401)
return req
# Factored out to allow for easy patching in tests
def _prompt_for_password(
self, netloc: str
) -> Tuple[Optional[str], Optional[str], bool]:
username = ask_input(f"User for {netloc}: ")
if not username:
return None, None, False
auth = get_keyring_auth(netloc, username)
if auth and auth[0] is not None and auth[1] is not None:
return auth[0], auth[1], False
password = ask_password("Password: ")
return username, password, True
# Factored out to allow for easy patching in tests
def _should_save_password_to_keyring(self) -> bool:
if not keyring:
return False
return ask("Save credentials to keyring [y/N]: ", ["y", "n"]) == "y"
def handle_401(self, resp: Response, **kwargs: Any) -> Response:
# We only care about 401 responses, anything else we want to just
# pass through the actual response
if resp.status_code != 401:
return resp
# We are not able to prompt the user so simply return the response
if not self.prompting:
return resp
parsed = urllib.parse.urlparse(resp.url)
# Query the keyring for credentials:
username, password = self._get_new_credentials(
resp.url,
allow_netrc=False,
allow_keyring=True,
)
# Prompt the user for a new username and password
save = False
if not username and not password:
username, password, save = self._prompt_for_password(parsed.netloc)
# Store the new username and password to use for future requests
self._credentials_to_save = None
if username is not None and password is not None:
self.passwords[parsed.netloc] = (username, password)
# Prompt to save the password to keyring
if save and self._should_save_password_to_keyring():
self._credentials_to_save = (parsed.netloc, username, password)
# Consume content and release the original connection to allow our new
# request to reuse the same one.
resp.content
resp.raw.release_conn()
# Add our new username and password to the request
req = HTTPBasicAuth(username or "", password or "")(resp.request)
req.register_hook("response", self.warn_on_401)
# On successful request, save the credentials that were used to
# keyring. (Note that if the user responded "no" above, this member
# is not set and nothing will be saved.)
if self._credentials_to_save:
req.register_hook("response", self.save_credentials)
# Send our new request
new_resp = resp.connection.send(req, **kwargs)
new_resp.history.append(resp)
return new_resp
def warn_on_401(self, resp: Response, **kwargs: Any) -> None:
"""Response callback to warn about incorrect credentials."""
if resp.status_code == 401:
logger.warning(
"401 Error, Credentials not correct for %s",
resp.request.url,
)
def save_credentials(self, resp: Response, **kwargs: Any) -> None:
"""Response callback to save credentials on success."""
assert keyring is not None, "should never reach here without keyring"
if not keyring:
return
creds = self._credentials_to_save
self._credentials_to_save = None
if creds and resp.status_code < 400:
try:
logger.info("Saving credentials to keyring")
keyring.set_password(*creds)
except Exception:
logger.exception("Failed to save credentials")
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