7fc0d1e6c7
enable a listener in collector that listens to events queue. this patch also renames 'metering_*' options which are now used by both events and samples. Change-Id: I6250c91e913864c3973e2d93022e38ad8bed8328 Implements: blueprint notification-pipelines
133 lines
4.4 KiB
Python
133 lines
4.4 KiB
Python
#
|
|
# Copyright 2012 New Dream Network, LLC (DreamHost)
|
|
#
|
|
# 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.
|
|
"""Utils for publishers
|
|
"""
|
|
|
|
import hashlib
|
|
import hmac
|
|
|
|
from oslo_config import cfg
|
|
import six
|
|
|
|
from ceilometer import utils
|
|
|
|
OPTS = [
|
|
cfg.StrOpt('telemetry_secret',
|
|
secret=True,
|
|
default='change this or be hacked',
|
|
help='Secret value for signing metering messages.',
|
|
deprecated_opts=[cfg.DeprecatedOpt("metering_secret",
|
|
"DEFAULT"),
|
|
cfg.DeprecatedOpt("metering_secret",
|
|
"publisher_rpc"),
|
|
cfg.DeprecatedOpt("metering_secret",
|
|
"publisher")]
|
|
),
|
|
]
|
|
cfg.CONF.register_opts(OPTS, group="publisher")
|
|
|
|
|
|
def compute_signature(message, secret):
|
|
"""Return the signature for a message dictionary."""
|
|
digest_maker = hmac.new(secret, '', hashlib.sha256)
|
|
for name, value in utils.recursive_keypairs(message):
|
|
if name == 'message_signature':
|
|
# Skip any existing signature value, which would not have
|
|
# been part of the original message.
|
|
continue
|
|
digest_maker.update(six.text_type(name).encode('utf-8'))
|
|
digest_maker.update(six.text_type(value).encode('utf-8'))
|
|
return digest_maker.hexdigest()
|
|
|
|
|
|
def besteffort_compare_digest(first, second):
|
|
"""Returns True if both string inputs are equal, otherwise False.
|
|
|
|
This function should take a constant amount of time regardless of
|
|
how many characters in the strings match.
|
|
|
|
"""
|
|
# NOTE(sileht): compare_digest method protected for timing-attacks
|
|
# exists since python >= 2.7.7 and python >= 3.3
|
|
# this a bit less-secure python fallback version
|
|
# taken from https://github.com/openstack/python-keystoneclient/blob/
|
|
# master/keystoneclient/middleware/memcache_crypt.py#L88
|
|
if len(first) != len(second):
|
|
return False
|
|
result = 0
|
|
if six.PY3 and isinstance(first, bytes) and isinstance(second, bytes):
|
|
for x, y in zip(first, second):
|
|
result |= x ^ y
|
|
else:
|
|
for x, y in zip(first, second):
|
|
result |= ord(x) ^ ord(y)
|
|
return result == 0
|
|
|
|
|
|
if hasattr(hmac, 'compare_digest'):
|
|
compare_digest = hmac.compare_digest
|
|
else:
|
|
compare_digest = besteffort_compare_digest
|
|
|
|
|
|
def verify_signature(message, secret):
|
|
"""Check the signature in the message.
|
|
|
|
Message is verified against the value computed from the rest of the
|
|
contents.
|
|
"""
|
|
old_sig = message.get('message_signature', '')
|
|
new_sig = compute_signature(message, secret)
|
|
|
|
if isinstance(old_sig, six.text_type):
|
|
try:
|
|
old_sig = old_sig.encode('ascii')
|
|
except UnicodeDecodeError:
|
|
return False
|
|
|
|
return compare_digest(new_sig, old_sig)
|
|
|
|
|
|
def meter_message_from_counter(sample, secret):
|
|
"""Make a metering message ready to be published or stored.
|
|
|
|
Returns a dictionary containing a metering message
|
|
for a notification message and a Sample instance.
|
|
"""
|
|
msg = {'source': sample.source,
|
|
'counter_name': sample.name,
|
|
'counter_type': sample.type,
|
|
'counter_unit': sample.unit,
|
|
'counter_volume': sample.volume,
|
|
'user_id': sample.user_id,
|
|
'project_id': sample.project_id,
|
|
'resource_id': sample.resource_id,
|
|
'timestamp': sample.timestamp,
|
|
'resource_metadata': sample.resource_metadata,
|
|
'message_id': sample.id,
|
|
}
|
|
msg['message_signature'] = compute_signature(msg, secret)
|
|
return msg
|
|
|
|
|
|
def message_from_event(event, secret):
|
|
"""Make an event message ready to be published or stored.
|
|
|
|
Returns a serialized model of Event containing an event message
|
|
"""
|
|
msg = event.serialize()
|
|
msg['message_signature'] = compute_signature(msg, secret)
|
|
return msg
|