mirror of
https://github.com/vmware/vsphere-automation-sdk-python.git
synced 2024-11-22 17:39:59 -05:00
538 lines
22 KiB
Python
538 lines
22 KiB
Python
"""
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* *******************************************************
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* Copyright VMware, Inc. 2013, 2016. All Rights Reserved.
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* SPDX-License-Identifier: MIT
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* *******************************************************
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*
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* DISCLAIMER. THIS PROGRAM IS PROVIDED TO YOU "AS IS" WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, WHETHER ORAL OR WRITTEN,
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* EXPRESS OR IMPLIED. THE AUTHOR SPECIFICALLY DISCLAIMS ANY IMPLIED
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* WARRANTIES OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY,
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* NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.
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"""
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__author__ = 'VMware, Inc.'
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__copyright__ = 'Copyright 2013, 2016 VMware, Inc. All rights reserved.'
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# Standard library imports.
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try:
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import httplib
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except ImportError:
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import http.client as httplib
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import base64
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import cgi
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import hashlib
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import re
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import sys
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import time
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from uuid import uuid4
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try:
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from StringIO import StringIO
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except ImportError:
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from io import StringIO
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try:
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from urlparse import urlparse
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except ImportError:
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from urllib.parse import urlparse
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# Third-party imports.
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from lxml import etree
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def _extract_certificate(cert):
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"""
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Extract DER certificate/private key from DER/base64-ed DER/PEM string.
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@type cert: C{str}
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@param cert: Certificate/private key in one of three supported formats.
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@rtype: C{str}
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@return: Certificate/private key in DER (binary ASN.1) format.
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"""
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if not cert:
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raise IOError('Empty certificate')
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signature = cert[0]
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# DER certificate is sequence. ASN.1 sequence is 0x30.
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if signature == '\x30':
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return cert
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# PEM without preamble. Base64-encoded 0x30 is 0x4D.
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if signature == '\x4D':
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return base64.b64decode(cert)
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# PEM with preamble. Starts with '-'.
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if signature == '-':
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return base64.b64decode(re.sub('-----[A-Z ]*-----', '', cert))
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# Unknown format.
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raise IOError('Invalid certificate file format')
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class SoapException(Exception):
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"""
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Exception raised in case of STS request failure.
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"""
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def __init__(self, soap_msg, fault_code, fault_string):
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"""
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Initializer for SoapException.
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@type soap_msg: C{str}
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@param soap_msg: the soap fault XML returned by STS
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@type fault_code: C{str}
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@param fault_code: The fault code returned by STS.
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@type fault_string: C{str}
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@param fault_string: The fault string returned by STS.
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"""
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self._soap_msg = soap_msg
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self._fault_code = fault_code
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self._fault_string = fault_string
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Exception.__init__(self)
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def __str__(self):
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"""
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Returns the string representation of SoapException.
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@rtype: C{str}
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@return: string representation of SoapException
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"""
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return ("SoapException:\nfaultcode: %(_fault_code)s\n"
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"faultstring: %(_fault_string)s\n"
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"faultxml: %(_soap_msg)s" % self.__dict__)
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class SSOHTTPSConnection(httplib.HTTPSConnection):
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"""
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An HTTPS class that verifies server's certificate on connect.
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"""
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def __init__(self, *args, **kwargs):
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"""
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Initializer. See httplib.HTTPSConnection for other arguments
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than thumbprint and server_cert.
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At least one of thumbprint, server_cert should be provided,
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otherwise server certificate is not validated.
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@type thumbprint: C(str)
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@param thumbprint: Expected SHA-1 thumbprint of the server
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certificate. May be None.
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@type server_cert: C(str)
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@param server_cert: File with expected server certificate.
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May be None.
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"""
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self.server_thumbprint = kwargs.pop('thumbprint')
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if self.server_thumbprint is not None:
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self.server_thumbprint = re.sub(':', '',
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self.server_thumbprint.lower())
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server_cert_path = kwargs.pop('server_cert')
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if server_cert_path is not None:
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with open(server_cert_path, 'rb') as f:
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server_cert = f.read()
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self.server_cert = _extract_certificate(server_cert)
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else:
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self.server_cert = None
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httplib.HTTPSConnection.__init__(self, *args, **kwargs)
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def _check_cert(self, peerCert):
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"""
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Verify that peer certificate matches one we expect.
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@type peerCert: C(str)
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@param peerCert: Server certificate in DER format.
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@rtype: boolean
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@return: True if peerCert is acceptable. False otherwise.
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"""
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if self.server_cert is not None:
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if peerCert != self.server_cert:
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return False
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if self.server_thumbprint is not None:
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thumbprint = hashlib.sha1(peerCert).hexdigest().lower() # pylint: disable=E1101
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if thumbprint != self.server_thumbprint:
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return False
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return True
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def connect(self):
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"""
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Connect method: connects to the remote system, and upon
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successful connection validates certificate.
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Throws an exception when something is wrong. See
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httplib.HTTPSConnection.connect() for details.
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"""
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httplib.HTTPSConnection.connect(self)
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if not self._check_cert(self.sock.getpeercert(True)):
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self.sock.close()
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self.sock = None
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raise IOError('Invalid certificate')
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class SsoAuthenticator(object):
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"""
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A class to handle the transport layer communication between the client and
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the STS service.
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"""
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def __init__(self,
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sts_url,
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sts_cert=None,
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thumbprint=None
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):
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"""
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Initializer for SsoAuthenticator.
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@type sts_url: C{str}
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@param sts_url: URL for the Security Token Service. Usually
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obtained by querying Component Manager.
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@type sts_cert: C{str}
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@param sts_cert: The file with public key of the Security
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Token Service. Usually obtained from
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Component Manager and written to the file.
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@type thumbprint: C{str}
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@param thumbprint: The SHA-1 thumbprint of the certificate used
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by the Security Token Service. It is same
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thumbprint you can pass to pyVmomi SoapAdapter.
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"""
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self._sts_cert = sts_cert
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self._sts_url = sts_url
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self._sts_thumbprint = thumbprint
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def perform_request(self,
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soap_message,
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public_key=None,
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private_key=None,
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ssl_context=None):
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"""
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Performs a Holder-of-Key SAML token request using the service user's
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certificates or a bearer token request using the user credentials.
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@type soap_message: C{str}
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@param soap_message: Authentication SOAP request.
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@type public_key: C{str}
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@param public_key: File containing the public key for the service
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user registered with SSO, in PEM format.
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@type private_key: C{str}
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@param private_key: File containing the private key for the service
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user registered with SSO, in PEM format.
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@type ssl_context: ssl.SSLContext
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@param ssl_context: Context describing the various SSL options.
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@rtype: C{str}
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@return: Response received from the STS after the HoK request.
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"""
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parsed = urlparse(self._sts_url)
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host = parsed.netloc # pylint: disable=E1101
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import ssl
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if ssl_context and hasattr(ssl, '_create_unverified_context'):
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# Python 2.7.9 has stronger SSL certificate validation, so we need
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# to pass in a context when dealing with self-signed certificates.
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webservice = SSOHTTPSConnection(host=host,
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key_file=private_key,
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cert_file=public_key,
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server_cert=self._sts_cert,
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thumbprint=self._sts_thumbprint,
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context=ssl_context)
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else:
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# Versions of Python before 2.7.9 don't support the context
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# parameter, so if it wan't provided, don't pass it on.
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webservice = SSOHTTPSConnection(host=host,
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key_file=private_key,
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cert_file=public_key,
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server_cert=self._sts_cert,
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thumbprint=self._sts_thumbprint)
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webservice.putrequest("POST", parsed.path, skip_host=True) # pylint: disable=E1101
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webservice.putheader("Host", host)
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webservice.putheader("User-Agent", "VMware/pyVmomi")
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webservice.putheader("Accept", "text/xml, multipart/related")
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webservice.putheader("Content-type", "text/xml; charset=\"UTF-8\"")
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webservice.putheader("Content-length", "%d" % len(soap_message))
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webservice.putheader("Connection", "keep-alive")
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webservice.putheader("SOAPAction",
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"http://docs.oasis-open.org/ws-sx/ws-trust/200512/RST/Issue")
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webservice.endheaders()
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if sys.version_info[0] >= 3: # Python 3
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webservice.send(bytes(soap_message, 'UTF-8'))
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else:
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webservice.send(soap_message)
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saml_response = webservice.getresponse()
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if saml_response.status != 200:
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fault = saml_response.read()
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# Best effort at figuring out a SOAP fault.
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if saml_response.status == 500 and fault and 'faultcode' in fault:
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fault_xml = etree.fromstring(fault)
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parsed_fault = fault_xml.xpath("//text()")
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if len(parsed_fault) == 2:
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raise SoapException(fault, *parsed_fault)
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raise Exception("Got response %s: %s\n%s" %
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(saml_response.status, saml_response.msg, fault))
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return saml_response.read()
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def get_bearer_saml_assertion(self,
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username,
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password,
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public_key=None,
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private_key=None,
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request_duration=60,
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token_duration=600,
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delegatable=False,
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renewable=False,
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ssl_context=None):
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"""
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Extracts the assertion from the Bearer Token received from the Security
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Token Service.
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@type username: C{str}
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@param username: Username for the user for which bearer token
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needs to be requested.
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@type password: C{str}
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@param password: Password for the user for which bearer token
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needs to be requested.
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@type public_key: C{str}
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@param public_key: File containing the public key for the service
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user registered with SSO, in PEM format.
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@type private_key: C{str}
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@param private_key: File containing the private key for the service
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user registered with SSO, in PEM format.
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@type request_duration: C{long}
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@param request_duration: The duration for which the request is valid. If
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the STS receives this request after this
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duration, it is assumed to have expired. The
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duration is in seconds and the default is 60s.
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@type token_duration: C{long}
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@param token_duration: The duration for which the SAML token is issued
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for. The duration is specified in seconds and
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the default is 600s.
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@type delegatable: C{boolean}
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@param delegatable: Whether the generated token is delegatable or not
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The default value is False
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@type ssl_context: ssl.SSLContext
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@param ssl_context: Context describing the various SSL options.
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@rtype: C{str}
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@return: The SAML assertion.
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"""
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request = SecurityTokenRequest(username=username,
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password=password,
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public_key=public_key,
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private_key=private_key,
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request_duration=request_duration,
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token_duration=token_duration)
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soap_message = request.construct_bearer_token_request(
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delegatable=delegatable, renewable=renewable)
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bearer_token = self.perform_request(soap_message,
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public_key,
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private_key,
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ssl_context)
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if sys.version_info[0] >= 3:
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return etree.tostring(
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_extract_element(etree.fromstring(bearer_token),
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'Assertion',
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{'saml2': "urn:oasis:names:tc:SAML:2.0:assertion"}),
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pretty_print=False).decode('utf-8')
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else:
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return etree.tostring(
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_extract_element(etree.fromstring(bearer_token),
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'Assertion',
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{'saml2': "urn:oasis:names:tc:SAML:2.0:assertion"}),
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pretty_print=False)
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class SecurityTokenRequest(object):
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"""
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SecurityTokenRequest class handles the serialization of request to the STS
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for a SAML token.
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"""
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# pylint: disable=R0902
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def __init__(self,
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username=None,
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password=None,
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public_key=None,
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private_key=None,
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request_duration=60,
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token_duration=600):
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"""
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Initializer for the SecurityToken Request class.
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@type username: C{str}
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@param username: Username for the user for which bearer token
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needs to be requested.
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@type password: C{str}
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@param password: Password for the user for which bearer token
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needs to be requested.
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@type public_key: C{str}
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@param public_key: The file containing the public key of the
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service account requesting the SAML token.
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@type private_key: C{str}
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@param private_key: The file containing the private key of the
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service account requesting the SAML token.
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@type request_duration: C{long}
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@param request_duration: The duration for which the request is valid. If
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the STS receives this request after this
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duration, it is assumed to have expired. The
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duration is specified in seconds and default is
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60s.
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@type token_duration: C{long}
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@param token_duraiton: The duration for which the SAML token is issued
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for. The duration is specified in seconds and
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the default is 600s.
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"""
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self._timestamp_id = _generate_id()
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self._signature_id = _generate_id()
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self._request_id = _generate_id()
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self._security_token_id = _generate_id()
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current = time.time()
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self._created = time.strftime(TIME_FORMAT,
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time.gmtime(current))
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self._expires = time.strftime(TIME_FORMAT,
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time.gmtime(current + token_duration))
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self._request_expires = time.strftime(TIME_FORMAT,
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time.gmtime(current +
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request_duration))
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self._timestamp = TIMESTAMP_TEMPLATE % self.__dict__
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self._username = cgi.escape(username) if username else username
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self._password = cgi.escape(password) if password else password
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self._public_key_file = public_key
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self._private_key_file = private_key
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self._act_as_token = None
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self._renewable = str(False).lower()
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self._delegatable = str(False).lower()
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self._use_key = ''
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self._private_key = None
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self._binary_exchange = None
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self._public_key = None
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def construct_bearer_token_request(self, delegatable=False, renewable=False):
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"""
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Constructs the actual Bearer token SOAP request.
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@type delegatable: C{boolean}
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@param delegatable: Whether the generated token is delegatable or not
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@type renewable: C{boolean}
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@param renewable: Whether the generated token is renewable or not
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The default value is False
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@rtype: C{str}
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@return: Bearer token SOAP request.
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"""
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self._key_type = "http://docs.oasis-open.org/ws-sx/ws-trust/200512/Bearer"
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self._security_token = USERNAME_TOKEN_TEMPLATE % self.__dict__
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self._delegatable = str(delegatable).lower()
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self._renewable = str(renewable).lower()
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return _canonicalize(REQUEST_TEMPLATE % self.__dict__)
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def _generate_id():
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"""
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An internal helper method to generate UUIDs.
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@rtype: C{str}
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@return: UUID
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"""
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return "_%s" % uuid4()
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def _canonicalize(xml_string):
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"""
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Given an xml string, canonicalize the string per
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U{http://www.w3.org/2001/10/xml-exc-c14n#}
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@type xml_string: C{str}
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@param xml_string: The XML string that needs to be canonicalized.
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@rtype: C{str}
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@return: Canonicalized string.
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"""
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string = StringIO(xml_string)
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parser = etree.XMLParser(remove_blank_text=True)
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tree = etree.parse(string, parser=parser)
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# io.StringIO only accepts Unicode input (i.e. u"multibyte string"), while StringIO.StringIO accepts either 8 bit input or unicode input.
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if sys.version_info[0] >= 3:
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from io import BytesIO
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string = BytesIO()
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tree.write_c14n(string, exclusive=True, with_comments=False)
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return string.getvalue().decode('utf-8')
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else:
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string = StringIO()
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tree.write_c14n(string, exclusive=True, with_comments=False)
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return string.getvalue()
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def _extract_element(xml, element_name, namespace):
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"""
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An internal method provided to extract an element from the given XML.
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@type xml: C{str}
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@param xml: The XML string from which the element will be extracted.
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@type element_name: C{str}
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@param element_name: The element that needs to be extracted from the XML.
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@type namespace: dict
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@param namespace: A dict containing the namespace of the element to be
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extracted.
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@rtype: etree element.
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@return: The extracted element.
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"""
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assert(len(namespace) == 1)
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result = xml.xpath("//%s:%s" % (list(namespace.keys())[0], element_name), # python 3.x dict.keys() returns a view
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namespaces=namespace)
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if result:
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return result[0]
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else:
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raise KeyError('%s does not seem to be present in the XML.' %
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element_name)
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TIME_FORMAT = "%Y-%m-%dT%H:%M:%S.987Z"
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# Template container for user's credentials when requesting a bearer token.
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USERNAME_TOKEN_TEMPLATE = """\
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<ns2:UsernameToken xmlns:ns2="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
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<ns2:Username>%(_username)s</ns2:Username>
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<ns2:Password>%(_password)s</ns2:Password>
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</ns2:UsernameToken>"""
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# Template containing the anchor to the signature.
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USE_KEY_TEMPLATE = """\
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<UseKey Sig="%(_signature_id)s"/>"""
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# The follwoing template is used to create a timestamp for the various messages.
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# The timestamp is used to indicate the duration of the request itself.
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TIMESTAMP_TEMPLATE = """\
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<ns3:Timestamp xmlns:ns3="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" ns3:Id="%(_timestamp_id)s">
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<ns3:Created>%(_created)s</ns3:Created><ns3:Expires>%(_request_expires)s</ns3:Expires></ns3:Timestamp>"""
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# The following template is used to construct the token requests to the STS.
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REQUEST_TEMPLATE = """\
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<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
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<SOAP-ENV:Header>
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<ns6:Security xmlns="http://docs.oasis-open.org/ws-sx/ws-trust/200512"
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xmlns:ns2="http://www.w3.org/2005/08/addressing"
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xmlns:ns3="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
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xmlns:ns6="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
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%(_timestamp)s
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%(_security_token)s
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</ns6:Security>
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</SOAP-ENV:Header>
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<SOAP-ENV:Body xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="%(_request_id)s">
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<RequestSecurityToken xmlns="http://docs.oasis-open.org/ws-sx/ws-trust/200512"
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xmlns:ns2="http://www.w3.org/2005/08/addressing"
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xmlns:ns3="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
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xmlns:ns6="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
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<TokenType>urn:oasis:names:tc:SAML:2.0:assertion</TokenType>
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<RequestType>http://docs.oasis-open.org/ws-sx/ws-trust/200512/Issue</RequestType>
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<Lifetime>
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<ns3:Created>%(_created)s</ns3:Created>
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<ns3:Expires>%(_expires)s</ns3:Expires>
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</Lifetime>
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<Renewing Allow="%(_renewable)s" OK="%(_renewable)s"/>
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<Delegatable>%(_delegatable)s</Delegatable>
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<KeyType>%(_key_type)s</KeyType>
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<SignatureAlgorithm>http://www.w3.org/2001/04/xmldsig-more#rsa-sha256</SignatureAlgorithm>%(_use_key)s</RequestSecurityToken>
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</SOAP-ENV:Body>
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</SOAP-ENV:Envelope>"""
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