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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""Wrappers around standard crypto data elements.
Includes root and intermediate CAs, SSH key_pairs and x509 certificates.
"""
from __future__ import absolute_import
import base64
import binascii
import os
from cryptography.hazmat import backends
from cryptography.hazmat.primitives.asymmetric import padding
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives import serialization
from cryptography import x509
from oslo_concurrency import processutils
from oslo_log import log as logging
import paramiko
import six
import nova.conf
from nova import exception
from nova.i18n import _
from nova import utils
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
def generate_fingerprint(public_key):
try:
pub_bytes = public_key.encode('utf-8')
# Test that the given public_key string is a proper ssh key. The
# returned object is unused since pyca/cryptography does not have a
# fingerprint method.
serialization.load_ssh_public_key(
pub_bytes, backends.default_backend())
pub_data = base64.b64decode(public_key.split(' ')[1])
digest = hashes.Hash(hashes.MD5(), backends.default_backend())
digest.update(pub_data)
md5hash = digest.finalize()
raw_fp = binascii.hexlify(md5hash)
if six.PY3:
raw_fp = raw_fp.decode('ascii')
return ':'.join(a + b for a, b in zip(raw_fp[::2], raw_fp[1::2]))
except Exception:
raise exception.InvalidKeypair(
reason=_('failed to generate fingerprint'))
def generate_x509_fingerprint(pem_key):
try:
if isinstance(pem_key, six.text_type):
pem_key = pem_key.encode('utf-8')
cert = x509.load_pem_x509_certificate(
pem_key, backends.default_backend())
raw_fp = binascii.hexlify(cert.fingerprint(hashes.SHA1()))
if six.PY3:
raw_fp = raw_fp.decode('ascii')
return ':'.join(a + b for a, b in zip(raw_fp[::2], raw_fp[1::2]))
except (ValueError, TypeError, binascii.Error) as ex:
raise exception.InvalidKeypair(
reason=_('failed to generate X509 fingerprint. '
'Error message: %s') % ex)
def generate_key_pair(bits=2048):
key = paramiko.RSAKey.generate(bits)
keyout = six.StringIO()
key.write_private_key(keyout)
private_key = keyout.getvalue()
public_key = '%s %s Generated-by-Nova' % (key.get_name(), key.get_base64())
fingerprint = generate_fingerprint(public_key)
return (private_key, public_key, fingerprint)
def ssh_encrypt_text(ssh_public_key, text):
"""Encrypt text with an ssh public key.
If text is a Unicode string, encode it to UTF-8.
"""
if isinstance(text, six.text_type):
text = text.encode('utf-8')
try:
pub_bytes = ssh_public_key.encode('utf-8')
pub_key = serialization.load_ssh_public_key(
pub_bytes, backends.default_backend())
return pub_key.encrypt(text, padding.PKCS1v15())
except Exception as exc:
raise exception.EncryptionFailure(reason=six.text_type(exc))
def generate_winrm_x509_cert(user_id, bits=2048):
"""Generate a cert for passwordless auth for user in project."""
subject = '/CN=%s' % user_id
upn = '%s@localhost' % user_id
with utils.tempdir() as tmpdir:
keyfile = os.path.abspath(os.path.join(tmpdir, 'temp.key'))
conffile = os.path.abspath(os.path.join(tmpdir, 'temp.conf'))
_create_x509_openssl_config(conffile, upn)
(certificate, _err) = processutils.execute(
'openssl', 'req', '-x509', '-nodes', '-days', '3650',
'-config', conffile, '-newkey', 'rsa:%s' % bits,
'-outform', 'PEM', '-keyout', keyfile, '-subj', subject,
'-extensions', 'v3_req_client',
binary=True)
(out, _err) = processutils.execute('openssl', 'pkcs12', '-export',
'-inkey', keyfile, '-password', 'pass:',
process_input=certificate,
binary=True)
private_key = base64.b64encode(out)
fingerprint = generate_x509_fingerprint(certificate)
if six.PY3:
private_key = private_key.decode('ascii')
certificate = certificate.decode('utf-8')
return (private_key, certificate, fingerprint)
def _create_x509_openssl_config(conffile, upn):
content = ("distinguished_name = req_distinguished_name\n"
"[req_distinguished_name]\n"
"[v3_req_client]\n"
"extendedKeyUsage = clientAuth\n"
"subjectAltName = otherName:""1.3.6.1.4.1.311.20.2.3;UTF8:%s\n")
with open(conffile, 'w') as file:
file.write(content % upn)
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