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https://github.com/xcat2/confluent.git
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0abe978bd9
For routed deployment, we have to preshare some information. Additionally, the API arm mechanism gets too open ended. Add support for using a shared secret over another channel to do HMAC of a key to authenticate peer, which has an alternate api arming mechanism that is hardened.
125 lines
4.8 KiB
Python
125 lines
4.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2019 Lenovo
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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 confluent.config.configmanager as cfm
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import confluent.netutil as netutil
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import confluent.util as util
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import datetime
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import eventlet
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import eventlet.green.socket as socket
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import eventlet.greenpool
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import hashlib
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import hmac
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import os
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import struct
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# cred grant tlvs:
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# 0, 0 - null
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# 1, len, <nodename>
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# 2, len, token - echo request
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# 3, len, token - echo reply
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# 4, len, crypted - crypted apikey
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# 5, 0, accept key
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# 6, len, hmac - hmac of crypted key using shared secret for long-haul support
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# 128, len, len, key - sealed key
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class CredServer(object):
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def __init__(self):
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self.cfm = cfm.ConfigManager(None)
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def handle_client(self, client, peer):
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try:
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apiarmed = None
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hmackey = None
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hmacval = None
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client.send(b'\xc2\xd1-\xa8\x80\xd8j\xba')
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tlv = bytearray(client.recv(2))
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if tlv[0] != 1:
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client.close()
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return
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nodename = util.stringify(client.recv(tlv[1]))
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tlv = bytearray(client.recv(2)) # should always be null
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onlylocal = True
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if tlv[0] == 6:
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hmacval = client.recv(tlv[1])
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hmackey = self.cfm.get_node_attributes(nodename, ['secret.selfapiarmtoken'], decrypt=True)
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hmackey = hmackey.get(nodename, {}).get('secret.selfapiarmtoken', {}).get('value', None)
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elif tlv[1]:
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client.recv(tlv[1])
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if not hmackey:
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if not netutil.address_is_local(peer[0]):
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client.close()
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return
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apimats = self.cfm.get_node_attributes(nodename,
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['deployment.apiarmed', 'deployment.sealedapikey'])
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apiarmed = apimats.get(nodename, {}).get('deployment.apiarmed', {}).get(
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'value', None)
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if not apiarmed:
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if apimats.get(nodename, {}).get(
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'deployment.sealedapikey', {}).get('value', None):
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sealed = apimats[nodename]['deployment.sealedapikey'][
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'value']
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if not isinstance(sealed, bytes):
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sealed = sealed.encode('utf8')
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reply = b'\x80' + struct.pack('>H', len(sealed) + 1) + sealed + b'\x00'
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client.send(reply)
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client.close()
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return
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if apiarmed not in ('once', 'continuous'):
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now = datetime.datetime.utcnow()
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expiry = datetime.datetime.strptime(apiarmed, "%Y-%m-%dT%H:%M:%SZ")
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if now > expiry:
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self.cfm.set_node_attributes({nodename: {'deployment.apiarmed': ''}})
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client.close()
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return
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client.send(b'\x02\x20')
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rttoken = os.urandom(32)
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client.send(rttoken)
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client.send(b'\x00\x00')
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tlv = bytearray(client.recv(2))
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if tlv[0] != 3:
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client.close()
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return
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echotoken = client.recv(tlv[1])
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if echotoken != rttoken:
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client.close()
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return
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tlv = bytearray(client.recv(2))
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if tlv[0] != 4:
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client.close()
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return
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echotoken = util.stringify(client.recv(tlv[1]))
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if hmackey:
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etok = echotoken.encode('utf8')
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if hmacval != hmac.new(hmackey, etok, hashlib.sha256).digest():
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client.close()
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return
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cfgupdate = {nodename: {'crypted.selfapikey': {'hashvalue': echotoken}, 'deployment.sealedapikey': '', 'deployment.apiarmed': ''}}
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if hmackey:
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self.cfm.clear_node_attributes([nodename], ['secret.selfapiarmtoken'])
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if apiarmed == 'continuous':
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del cfgupdate[nodename]['deployment.apiarmed']
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self.cfm.set_node_attributes(cfgupdate)
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client.recv(2) # drain end of message
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client.send(b'\x05\x00') # report success
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finally:
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client.close()
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if __name__ == '__main__':
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a = CredServer()
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while True:
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eventlet.sleep(86400)
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