101 lines
3.3 KiB
Python
101 lines
3.3 KiB
Python
# Copyright 2015 Tom Cammann
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import datetime
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import logging
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import os.path
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import x509
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LOG = logging.getLogger(__name__)
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class CertWatcher(object):
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def __init__(self, key_path, cert_path, common_name, ca_driver,
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on_refresh_success=None, on_refresh_failure=None,
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refresh_window=None):
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if not os.path.isfile(key_path):
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raise Exception("key needs to exist")
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self.key_path = key_path
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self.cert_path = cert_path
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self.ca_driver = ca_driver
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self.on_refresh_success = on_refresh_success
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self.on_refresh_failure = on_refresh_failure
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self.common_name = common_name
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self.refresh_window = refresh_window
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@property
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def key(self):
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return open(self.key_path).read()
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@property
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def cert(self):
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return open(self.cert_path).read()
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def get_expire_date(self):
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return x509.get_expire_date(self.cert)
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def seconds_until_expiry(self):
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diff = self.get_expire_date() - datetime.datetime.now()
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return diff.total_seconds()
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def _replace_cert(self, cert_contents):
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LOG.info("Replacing certificate at %s" % self.cert_path)
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cert = open(self.cert_path, "w")
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cert.write(cert_contents)
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cert.close()
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def _will_be_expired(self, date):
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return date > self.get_expire_date()
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def _expires_in_window(self):
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now = datetime.datetime.now()
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if not self.refresh_window:
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LOG.debug("No refresh window set, assuming expired")
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return True
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window = now + datetime.timedelta(0, self.refresh_window)
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if self._will_be_expired(window):
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LOG.info("%s is expired inside window of %s"
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% (self.cert_path, self.refresh_window))
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return True
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LOG.info("Certificate valid within window of %s seconds"
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% self.refresh_window)
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return False
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def _cert_exists(self):
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if not os.path.isfile(self.cert_path):
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LOG.info("No cert found at %s" % self.cert_path)
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return False
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return True
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def is_invalid_cert(self):
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return not self._cert_exists() or self._expires_in_window()
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def check_and_update(self):
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LOG.info('Checking validity of certificate %s' % self.cert_path)
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if self.is_invalid_cert():
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csr = x509.generate_csr(self.key, self.common_name)
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cert = None
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try:
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cert = self.ca_driver.sign(csr)
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except Exception as e:
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LOG.exception("Could not retrieve cert\n%s", e)
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if cert:
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self._replace_cert(cert)
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self.on_refresh_success()
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else:
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self.on_refresh_failure()
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