Source code for miniopy_async.credentials.providers

# -*- coding: utf-8 -*-
# Asynchronous MinIO Client SDK for Python
# (C) 2020 MinIO, Inc.
# (C) 2022 Huseyn Mashadiyev <mashadiyev.huseyn@gmail.com>
# (C) 2022 L-ING <hlf01@icloud.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# NOTICE: This file has been changed and differs from the original
# Author: L-ING
# Date: 2022-07-11

"""Credential providers."""

from __future__ import annotations

import configparser
import ipaddress
import json
import os
import socket
import ssl
import sys
import time
from abc import ABCMeta, abstractmethod
from datetime import timedelta
from pathlib import Path
from typing import Awaitable, Callable, cast
from urllib.parse import urlencode, urlsplit, urlunsplit
from xml.etree import ElementTree as ET

import certifi
from aiofile import async_open
from aiohttp import ClientResponse, ClientSession, TCPConnector
from aiohttp.typedefs import LooseHeaders
from aiohttp_retry import ExponentialRetry, RetryClient
from yarl import URL

from miniopy_async.helpers import sha256_hash, url_replace
from miniopy_async.signer import sign_v4_sts
from miniopy_async.time import from_iso8601utc, to_amz_date, utcnow
from miniopy_async.xml import find, findtext

from .credentials import Credentials

_MIN_DURATION_SECONDS = int(timedelta(minutes=15).total_seconds())
_MAX_DURATION_SECONDS = int(timedelta(days=7).total_seconds())
_DEFAULT_DURATION_SECONDS = int(timedelta(hours=1).total_seconds())


def _parse_credentials(data: str, name: str) -> Credentials:
    """Parse data containing credentials XML."""
    element = ET.fromstring(data)
    element = cast(ET.Element, find(element, name, True))
    element = cast(ET.Element, find(element, "Credentials", True))
    expiration = from_iso8601utc(findtext(element, "Expiration", True))
    return Credentials(
        cast(str, findtext(element, "AccessKeyId", True)),
        cast(str, findtext(element, "SecretAccessKey", True)),
        findtext(element, "SessionToken", True),
        expiration,
    )


async def _urlopen(
    session: ClientSession | RetryClient,
    method: str,
    url: str,
    body: str | bytes | None = None,
    headers: LooseHeaders | None = None,
) -> ClientResponse:
    """Wrapper of urlopen() handles HTTP status code."""
    res = await session.request(method, url, data=body, headers=headers)
    if res.status not in [200, 204, 206]:
        raise ValueError(f"{url} failed with HTTP status code {res.status}")
    return res


def _user_home_dir() -> str:
    """Return current user home folder."""
    return os.environ.get("HOME") or os.environ.get("UserProfile") or str(Path.home())


[docs] class Provider: # pylint: disable=too-few-public-methods """Credential retriever.""" __metaclass__ = ABCMeta
[docs] @abstractmethod async def retrieve(self) -> Credentials: """Retrieve credentials and its expiry if available."""
[docs] class AssumeRoleProvider(Provider): """Assume-role credential provider.""" def __init__( self, sts_endpoint: str, access_key: str, secret_key: str, duration_seconds: int = 0, policy: str | None = None, region: str | None = None, role_arn: str | None = None, role_session_name: str | None = None, external_id: str | None = None, client_session: Callable[..., ClientSession | RetryClient] | None = None, ): self._sts_endpoint = sts_endpoint self._access_key = access_key self._secret_key = secret_key self._region = region or "" self._client_session = client_session query_params = { "Action": "AssumeRole", "Version": "2011-06-15", "DurationSeconds": str( duration_seconds if duration_seconds > _DEFAULT_DURATION_SECONDS else _DEFAULT_DURATION_SECONDS ), } if role_arn: query_params["RoleArn"] = role_arn if role_session_name: query_params["RoleSessionName"] = role_session_name if policy: query_params["Policy"] = policy if external_id: query_params["ExternalId"] = external_id self._body = urlencode(query_params) self._content_sha256 = sha256_hash(self._body) url = urlsplit(sts_endpoint) self._url = url self._host = url.netloc if (url.scheme == "http" and url.port == 80) or ( url.scheme == "https" and url.port == 443 ): self._host = cast(str, url.hostname) self._credentials = None def _session(self) -> ClientSession | RetryClient: if self._client_session is None: return RetryClient( retry_options=ExponentialRetry( attempts=5, factor=0.2, statuses={500, 502, 503, 504} ), ) return self._client_session()
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials.""" if self._credentials and not self._credentials.is_expired(): return self._credentials utctime = utcnow() headers = sign_v4_sts( "POST", self._url, self._region, { "Content-Type": "application/x-www-form-urlencoded", "Host": self._host, "X-Amz-Date": to_amz_date(utctime), }, Credentials(self._access_key, self._secret_key), self._content_sha256, utctime, ) async with self._session() as session: res = await _urlopen( session, "POST", self._sts_endpoint, body=self._body, headers=headers, ) self._credentials = _parse_credentials( await res.text(), "AssumeRoleResult", ) return self._credentials
[docs] class ChainedProvider(Provider): """Chained credential provider.""" def __init__(self, providers: list[Provider]): self._providers = providers self._provider: Provider | None = None self._credentials: Credentials | None = None
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials from one of available provider.""" if self._credentials and not self._credentials.is_expired(): return self._credentials if self._provider: try: self._credentials = await self._provider.retrieve() return self._credentials except ValueError: # Ignore this error and iterate other providers. pass for provider in self._providers: try: self._credentials = await provider.retrieve() self._provider = provider return self._credentials except ValueError: # Ignore this error and iterate other providers. pass raise ValueError("All providers fail to fetch credentials")
[docs] class EnvAWSProvider(Provider): """Credential provider from AWS environment variables."""
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials.""" return Credentials( access_key=( cast( str, os.environ.get("AWS_ACCESS_KEY_ID") or os.environ.get("AWS_ACCESS_KEY"), ) ), secret_key=( cast( str, os.environ.get("AWS_SECRET_ACCESS_KEY") or os.environ.get("AWS_SECRET_KEY"), ) ), session_token=os.environ.get("AWS_SESSION_TOKEN"), )
[docs] class EnvMinioProvider(Provider): """Credential provider from MinIO environment variables."""
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials.""" return Credentials( access_key=os.environ.get("MINIO_ACCESS_KEY") or "", secret_key=os.environ.get("MINIO_SECRET_KEY") or "", )
[docs] class AWSConfigProvider(Provider): """Credential provider from AWS credential file.""" def __init__( self, filename: str | None = None, profile: str | None = None, ): self._filename = ( filename or os.environ.get("AWS_SHARED_CREDENTIALS_FILE") or os.path.join(_user_home_dir(), ".aws", "credentials") ) self._profile = profile or os.environ.get("AWS_PROFILE") or "default"
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials from AWS configuration file.""" parser = configparser.ConfigParser() parser.read(self._filename) access_key = parser.get( self._profile, "aws_access_key_id", fallback=None, ) secret_key = parser.get( self._profile, "aws_secret_access_key", fallback=None, ) session_token = parser.get( self._profile, "aws_session_token", fallback=None, ) if not access_key: raise ValueError( f"access key does not exist in profile " f"{self._profile} in AWS credential file {self._filename}" ) if not secret_key: raise ValueError( f"secret key does not exist in profile " f"{self._profile} in AWS credential file {self._filename}" ) return Credentials( access_key, secret_key, session_token=session_token, )
[docs] class MinioClientConfigProvider(Provider): """Credential provider from MinIO Client configuration file.""" def __init__(self, filename: str | None = None, alias: str | None = None): self._filename = filename or os.path.join( _user_home_dir(), "mc" if sys.platform == "win32" else ".mc", "config.json", ) self._alias = alias or os.environ.get("MINIO_ALIAS") or "s3"
[docs] async def retrieve(self) -> Credentials: """Retrieve credential value from MinIO client configuration file.""" try: async with async_open(self._filename, encoding="utf-8") as conf_file: config = json.loads(await conf_file.read()) aliases = config.get("hosts") or config.get("aliases") if not aliases: raise ValueError( f"invalid configuration in file {self._filename}", ) creds = aliases.get(self._alias) if not creds: raise ValueError( f"alias {self._alias} not found in MinIO client" f"configuration file {self._filename}" ) return Credentials(creds.get("accessKey"), creds.get("secretKey")) except (IOError, OSError) as exc: raise ValueError( f"error in reading file {self._filename}", ) from exc
def _check_loopback_host(url: str): """Check whether host in url points only to localhost.""" host = cast(str, URL(url).host) try: addrs = set(info[4][0] for info in socket.getaddrinfo(host, None)) for addr in addrs: if not ipaddress.ip_address(addr).is_loopback: raise ValueError(host + " is not loopback only host") except socket.gaierror as exc: raise ValueError("Host " + host + " is not loopback address") from exc async def _get_jwt_token(token_file: str) -> dict[str, str]: """Read and return content of token file.""" try: async with async_open(token_file, encoding="utf-8") as file: return {"access_token": await file.read(), "expires_in": "0"} except (IOError, OSError) as exc: raise ValueError(f"error in reading file {token_file}") from exc
[docs] class IamAwsProvider(Provider): """Credential provider using IAM roles for Amazon EC2/ECS.""" def __init__( self, custom_endpoint: str | None = None, client_session: Callable[..., ClientSession | RetryClient] | None = None, auth_token: str | None = None, relative_uri: str | None = None, full_uri: str | None = None, token_file: str | None = None, role_arn: str | None = None, role_session_name: str | None = None, region: str | None = None, ): self._custom_endpoint = custom_endpoint self._client_session = client_session self._token = os.environ.get("AWS_CONTAINER_AUTHORIZATION_TOKEN") or auth_token self._token_file = ( os.environ.get("AWS_CONTAINER_AUTHORIZATION_TOKEN_FILE") or auth_token ) self._identity_file = ( os.environ.get("AWS_WEB_IDENTITY_TOKEN_FILE") or token_file ) self._aws_region = os.environ.get("AWS_REGION") or region self._role_arn = os.environ.get("AWS_ROLE_ARN") or role_arn self._role_session_name = ( os.environ.get("AWS_ROLE_SESSION_NAME") or role_session_name ) self._relative_uri = ( os.environ.get("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI") or relative_uri ) if self._relative_uri and not self._relative_uri.startswith("/"): self._relative_uri = "/" + self._relative_uri self._full_uri = ( os.environ.get("AWS_CONTAINER_CREDENTIALS_FULL_URI") or full_uri ) self._credentials: Credentials | None = None def _session(self) -> ClientSession | RetryClient: if self._client_session is None: return RetryClient( retry_options=ExponentialRetry( attempts=5, factor=0.2, statuses={500, 502, 503, 504} ), ) return self._client_session()
[docs] async def fetch( self, url: str, headers: dict[str, str] | None = None, ) -> Credentials: """Fetch credentials from EC2/ECS.""" async with self._session() as session: res = await _urlopen(session, "GET", url, headers=headers) data = json.loads(await res.text()) if data.get("Code", "Success") != "Success": raise ValueError( f"{url} failed with code {data['Code']} " f"message {data.get('Message')}" ) data["Expiration"] = from_iso8601utc(data["Expiration"]) return Credentials( data["AccessKeyId"], data["SecretAccessKey"], data["Token"], data["Expiration"], )
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials from WebIdentity/EC2/ECS.""" if self._credentials and not self._credentials.is_expired(): return self._credentials url = self._custom_endpoint if self._token_file: if not url: url = "https://sts.amazonaws.com" if self._aws_region: url = f"https://sts.{self._aws_region}.amazonaws.com" provider = WebIdentityProvider( lambda: _get_jwt_token(cast(str, self._identity_file)), url, role_arn=self._role_arn, role_session_name=self._role_session_name, client_session=self._session, ) self._credentials = await provider.retrieve() return self._credentials headers: dict[str, str] | None = None if self._relative_uri: if not url: url = "http://169.254.170.2" + self._relative_uri headers = {"Authorization": self._token} if self._token else None elif self._full_uri: token = self._token if self._token_file: url = self._full_uri async with async_open(self._token_file, encoding="utf-8") as file: token = await file.read() else: if not url: url = self._full_uri _check_loopback_host(url) headers = {"Authorization": token} if token else None else: if not url: url = "http://169.254.169.254" async with self._session() as session: # Get IMDS Token res = await _urlopen( session, "PUT", url + "/latest/api/token", headers={"X-aws-ec2-metadata-token-ttl-seconds": "21600"}, ) token = await res.text("utf-8") headers = {"X-aws-ec2-metadata-token": token} if token else None # Get role name url = urlunsplit( url_replace( urlsplit(url), path="/latest/meta-data/iam/security-credentials/", ), ) async with self._session() as session: res = await _urlopen(session, "GET", url, headers=headers) role_names = (await res.text("utf-8")).split("\n") if not role_names: raise ValueError(f"no IAM roles attached to EC2 service {url}") url += role_names[0].strip("\r") if not url: raise ValueError("url is empty; this should not happen") self._credentials = await self.fetch(url, headers=headers) return self._credentials
[docs] class LdapIdentityProvider(Provider): """Credential provider using AssumeRoleWithLDAPIdentity API.""" def __init__( self, sts_endpoint: str, ldap_username: str, ldap_password: str, client_session: Callable[..., ClientSession | RetryClient] | None = None, ): self._sts_endpoint = ( sts_endpoint + "?" + urlencode( { "Action": "AssumeRoleWithLDAPIdentity", "Version": "2011-06-15", "LDAPUsername": ldap_username, "LDAPPassword": ldap_password, }, ) ) self._client_session = client_session self._credentials = None def _session(self) -> ClientSession | RetryClient: if self._client_session is None: return RetryClient( retry_options=ExponentialRetry( attempts=5, factor=0.2, statuses={500, 502, 503, 504} ), ) return self._client_session()
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials.""" if self._credentials and not self._credentials.is_expired(): return self._credentials async with self._session() as session: res = await _urlopen( session, "POST", self._sts_endpoint, ) self._credentials = _parse_credentials( await res.text(), "AssumeRoleWithLDAPIdentityResult", ) return self._credentials
[docs] class StaticProvider(Provider): """Fixed credential provider.""" def __init__( self, access_key: str, secret_key: str, session_token: str | None = None, ): self._credentials = Credentials(access_key, secret_key, session_token)
[docs] async def retrieve(self) -> Credentials: """Return passed credentials.""" return self._credentials
[docs] class WebIdentityClientGrantsProvider(Provider): """Base class for WebIdentity and ClientGrants credentials provider.""" __metaclass__ = ABCMeta def __init__( self, jwt_provider_func: Callable[[], Awaitable[dict[str, str]]], sts_endpoint: str, duration_seconds: int = 0, policy: str | None = None, role_arn: str | None = None, role_session_name: str | None = None, client_session: Callable[..., ClientSession | RetryClient] | None = None, ): self._jwt_provider_func = jwt_provider_func self._sts_endpoint = sts_endpoint self._duration_seconds = duration_seconds self._policy = policy self._role_arn = role_arn self._role_session_name = role_session_name self._client_session = client_session self._credentials: Credentials | None = None def _session(self) -> ClientSession | RetryClient: if self._client_session is None: return RetryClient( retry_options=ExponentialRetry( attempts=5, factor=0.2, statuses={500, 502, 503, 504} ), ) return self._client_session() @abstractmethod def _is_web_identity(self) -> bool: """Check if derived class deal with WebIdentity.""" def _get_duration_seconds(self, expiry: int) -> int: """Get DurationSeconds optimal value.""" if self._duration_seconds: expiry = self._duration_seconds if expiry > _MAX_DURATION_SECONDS: return _MAX_DURATION_SECONDS if expiry <= 0: return expiry return _MIN_DURATION_SECONDS if expiry < _MIN_DURATION_SECONDS else expiry
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials.""" if self._credentials and not self._credentials.is_expired(): return self._credentials jwt = await self._jwt_provider_func() query_params = {"Version": "2011-06-15"} duration_seconds = self._get_duration_seconds( int(jwt.get("expires_in", "0")), ) if duration_seconds: query_params["DurationSeconds"] = str(duration_seconds) if self._policy: query_params["Policy"] = self._policy access_token = jwt.get("access_token") or jwt.get("id_token", "") if self._is_web_identity(): query_params["Action"] = "AssumeRoleWithWebIdentity" query_params["WebIdentityToken"] = access_token if self._role_arn: query_params["RoleArn"] = self._role_arn query_params["RoleSessionName"] = ( self._role_session_name if self._role_session_name else str(time.time()).replace(".", "") ) else: query_params["Action"] = "AssumeRoleWithClientGrants" query_params["Token"] = access_token url = self._sts_endpoint + "?" + urlencode(query_params) async with self._session() as session: res = await _urlopen(session, "POST", url) self._credentials = _parse_credentials( await res.text(), ( "AssumeRoleWithWebIdentityResult" if self._is_web_identity() else "AssumeRoleWithClientGrantsResult" ), ) return self._credentials
[docs] class ClientGrantsProvider(WebIdentityClientGrantsProvider): """Credential provider using AssumeRoleWithClientGrants API.""" def __init__( self, jwt_provider_func: Callable[[], Awaitable[dict[str, str]]], sts_endpoint: str, duration_seconds: int = 0, policy: str | None = None, client_session: Callable[..., ClientSession | RetryClient] | None = None, ): super().__init__( jwt_provider_func, sts_endpoint, duration_seconds, policy, client_session=client_session, ) def _is_web_identity(self) -> bool: return False
[docs] class WebIdentityProvider(WebIdentityClientGrantsProvider): """Credential provider using AssumeRoleWithWebIdentity API.""" def _is_web_identity(self) -> bool: return True
[docs] class CertificateIdentityProvider(Provider): """Credential provider using AssumeRoleWithCertificate API.""" def __init__( self, sts_endpoint: str, cert_file: str | None = None, key_file: str | None = None, key_password: str | None = None, ca_certs: str | None = None, duration_seconds: int = 0, client_session: Callable[..., ClientSession | RetryClient] | None = None, ): if urlsplit(sts_endpoint).scheme != "https": raise ValueError("STS endpoint scheme must be HTTPS") if bool(client_session) != (cert_file and key_file): pass else: raise ValueError( "either cert/key file or custom client_session must be provided", ) self._sts_endpoint = ( sts_endpoint + "?" + urlencode( { "Action": "AssumeRoleWithCertificate", "Version": "2011-06-15", "DurationSeconds": str( duration_seconds if duration_seconds > _DEFAULT_DURATION_SECONDS else _DEFAULT_DURATION_SECONDS ), }, ) ) ssl_context = ssl.create_default_context(cafile=ca_certs or certifi.where()) if cert_file and key_file: ssl_context.load_cert_chain( certfile=cert_file, keyfile=key_file, password=key_password ) self._ssl_context = ssl_context self._retry_options = ExponentialRetry( attempts=5, factor=0.2, statuses={500, 502, 503, 504} ) self._client_session = client_session self._credentials: Credentials | None = None def _session(self) -> ClientSession | RetryClient: if self._client_session is None: return RetryClient( ClientSession( connector=TCPConnector(limit=10, ssl=self._ssl_context), ), retry_options=self._retry_options, ) return self._client_session()
[docs] async def retrieve(self) -> Credentials: """Retrieve credentials.""" if self._credentials and not self._credentials.is_expired(): return self._credentials async with self._session() as session: res = await _urlopen( session, "POST", self._sts_endpoint, ) self._credentials = _parse_credentials( await res.text(), "AssumeRoleWithCertificateResult", ) return self._credentials