A set of Neutron drivers for the VMware NSX.
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# Copyright 2016 VMware, Inc.
# All Rights Reserved
#
# 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.
import base64
from cryptography import fernet
import hashlib
import logging
from oslo_config import cfg
from vmware_nsx.db import db as nsx_db
LOG = logging.getLogger(__name__)
NSX_OPENSTACK_IDENTITY = "com.vmware.nsx.openstack"
# 32-byte base64-encoded secret for symmetric password encryption
# generated on init based on password provided in configuration
_SECRET = None
def reset_secret():
global _SECRET
_SECRET = None
def generate_secret_from_password(password):
m = hashlib.md5()
m.update(password.encode('ascii'))
return base64.b64encode(m.hexdigest().encode('ascii'))
def symmetric_encrypt(secret, plaintext):
if not isinstance(plaintext, bytes):
plaintext = plaintext.encode('ascii')
return fernet.Fernet(secret).encrypt(plaintext).decode('ascii')
def symmetric_decrypt(secret, ciphertext):
if not isinstance(ciphertext, bytes):
ciphertext = ciphertext.encode('ascii')
return fernet.Fernet(secret).decrypt(ciphertext).decode('ascii')
class DbCertificateStorageDriver(object):
"""Storage for certificate and private key in neutron DB"""
def __init__(self, context):
global _SECRET
self._context = context
if cfg.CONF.nsx_v3.nsx_client_cert_pk_password and not _SECRET:
_SECRET = generate_secret_from_password(
cfg.CONF.nsx_v3.nsx_client_cert_pk_password)
def store_cert(self, purpose, certificate, private_key):
# ecrypt private key
if _SECRET:
private_key = symmetric_encrypt(_SECRET, private_key)
nsx_db.save_certificate(self._context.session, purpose,
certificate, private_key)
def get_cert(self, purpose):
cert, private_key = nsx_db.get_certificate(self._context.session,
purpose)
if _SECRET and private_key:
try:
# Encrypted PK is stored in DB as string, while fernet expects
# bytearray.
private_key = symmetric_decrypt(_SECRET, private_key)
except fernet.InvalidToken:
# unable to decrypt - probably due to change of password
# cert and PK are useless, need to delete them
LOG.error("Unable to decrypt private key, possibly due "
"to change of password. Certificate needs to be "
"regenerated")
self.delete_cert(purpose)
return None, None
return cert, private_key
def delete_cert(self, purpose):
return nsx_db.delete_certificate(self._context.session, purpose)
class DummyCertificateStorageDriver(object):
"""Dummy driver API implementation
Used for external certificate import scenario
(nsx_client_cert_storage == None)
"""
def store_cert(self, purpose, certificate, private_key):
pass
def get_cert(self, purpose):
return None, None
def delete_cert(self, purpose):
pass