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# Copyright (c) 2018 The Johns Hopkins University/Applied Physics Laboratory
# 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 logging
import multiprocessing
import os
import signal
import time
from kmip.core import policy as operation_policy
def get_json_files(p):
"""
Scan the provided policy directory for all JSON policy files.
"""
f = [os.path.join(p, x) for x in os.listdir(p) if x.endswith(".json")]
return sorted(f)
class PolicyDirectoryMonitor(multiprocessing.Process):
"""
A file monitor that tracks modifications made within the policy directory.
"""
def __init__(self, policy_directory, policy_store, live_monitoring=True):
"""
Set up the file monitor with the policy directory to track.
Args:
policy_directory (string): The system path of the policy directory
that should be monitored. Required.
policy_store (DictProxy): A dictionary proxy created by the server
multiprocessing resource manager. Used to store and share the
policy information across server processes and threads.
Required.
live_monitoring (boolean): A boolean indicating whether or not
live monitoring should continue indefinitely. Optional,
defaults to True.
"""
super(PolicyDirectoryMonitor, self).__init__()
self.halt_trigger = multiprocessing.Event()
self.policy_directory = policy_directory
self.live_monitoring = live_monitoring
self.file_timestamps = None
self.policy_cache = None
self.policy_files = None
self.policy_map = None
self.policy_store = policy_store
self.reserved_policies = ['default', 'public']
def interrupt_handler(trigger, frame):
self.stop()
signal.signal(signal.SIGINT, interrupt_handler)
signal.signal(signal.SIGTERM, interrupt_handler)
self.logger = logging.getLogger("kmip.server.monitor")
self.initialize_tracking_structures()
def stop(self):
self.halt_trigger.set()
def scan_policies(self):
"""
Scan the policy directory for policy data.
"""
policy_files = get_json_files(self.policy_directory)
for f in set(policy_files) - set(self.policy_files):
self.file_timestamps[f] = 0
for f in set(self.policy_files) - set(policy_files):
self.logger.info("Removing policies for file: {}".format(f))
self.file_timestamps.pop(f, None)
for p in self.policy_cache.keys():
self.disassociate_policy_and_file(p, f)
for p in [k for k, v in self.policy_map.items() if v == f]:
self.restore_or_delete_policy(p)
self.policy_files = policy_files
for f in sorted(self.file_timestamps.keys()):
t = os.path.getmtime(f)
if t > self.file_timestamps[f]:
self.logger.info("Loading policies for file: {}".format(f))
self.file_timestamps[f] = t
old_p = [k for k, v in self.policy_map.items() if v == f]
try:
new_p = operation_policy.read_policy_from_file(f)
except ValueError:
self.logger.error("Failure loading file: {}".format(f))
self.logger.debug("", exc_info=True)
continue
for p in new_p.keys():
self.logger.info("Loading policy: {}".format(p))
if p in self.reserved_policies:
self.logger.warning(
"Policy '{}' overwrites a reserved policy and "
"will be thrown out.".format(p)
)
continue
if p in sorted(self.policy_store.keys()):
self.logger.debug(
"Policy '{}' overwrites an existing "
"policy.".format(p)
)
if f != self.policy_map.get(p):
self.policy_cache.get(p).append(
(
time.time(),
self.policy_map.get(p),
self.policy_store.get(p)
)
)
else:
self.policy_cache[p] = []
self.policy_store[p] = new_p.get(p)
self.policy_map[p] = f
for p in set(old_p) - set(new_p.keys()):
self.disassociate_policy_and_file(p, f)
self.restore_or_delete_policy(p)
def run(self):
"""
Start monitoring operation policy files.
"""
self.initialize_tracking_structures()
if self.live_monitoring:
self.logger.info("Starting up the operation policy file monitor.")
while not self.halt_trigger.is_set():
time.sleep(1)
self.scan_policies()
self.logger.info("Stopping the operation policy file monitor.")
else:
self.scan_policies()
def initialize_tracking_structures(self):
self.file_timestamps = {}
self.policy_cache = {}
self.policy_files = []
self.policy_map = {}
for k in self.policy_store.keys():
if k not in self.reserved_policies:
self.policy_store.pop(k, None)
def disassociate_policy_and_file(self, policy, file_name):
c = self.policy_cache.get(policy, [])
for i in [c.index(e) for e in c if e[1] == file_name][::-1]:
c.pop(i)
def restore_or_delete_policy(self, policy):
c = self.policy_cache.get(policy, [])
if len(c) == 0:
self.logger.info("Removing policy: {}".format(policy))
self.policy_store.pop(policy, None)
self.policy_map.pop(policy, None)
self.policy_cache.pop(policy, None)
else:
e = c.pop()
self.policy_store[policy] = e[2]
self.policy_map[policy] = e[1]
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