127 lines
4.7 KiB
Python
127 lines
4.7 KiB
Python
# Copyright 2018 Canonical Limited.
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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 json
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import os
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import charmhelpers.contrib.openstack.alternatives as alternatives
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import charmhelpers.contrib.openstack.context as context
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import charmhelpers.core.hookenv as hookenv
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import charmhelpers.core.host as host
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import charmhelpers.core.templating as templating
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import charmhelpers.core.unitdata as unitdata
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VAULTLOCKER_BACKEND = 'charm-vaultlocker'
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class VaultKVContext(context.OSContextGenerator):
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"""Vault KV context for interaction with vault-kv interfaces"""
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interfaces = ['secrets-storage']
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def __init__(self, secret_backend=None):
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super(context.OSContextGenerator, self).__init__()
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self.secret_backend = (
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secret_backend or 'charm-{}'.format(hookenv.service_name())
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)
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def __call__(self):
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db = unitdata.kv()
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last_token = db.get('last-token')
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secret_id = db.get('secret-id')
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for relation_id in hookenv.relation_ids(self.interfaces[0]):
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for unit in hookenv.related_units(relation_id):
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data = hookenv.relation_get(unit=unit,
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rid=relation_id)
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vault_url = data.get('vault_url')
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role_id = data.get('{}_role_id'.format(hookenv.local_unit()))
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token = data.get('{}_token'.format(hookenv.local_unit()))
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if all([vault_url, role_id, token]):
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token = json.loads(token)
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vault_url = json.loads(vault_url)
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# Tokens may change when secret_id's are being
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# reissued - if so use token to get new secret_id
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if token != last_token:
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secret_id = retrieve_secret_id(
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url=vault_url,
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token=token
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)
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db.set('secret-id', secret_id)
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db.set('last-token', token)
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db.flush()
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ctxt = {
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'vault_url': vault_url,
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'role_id': json.loads(role_id),
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'secret_id': secret_id,
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'secret_backend': self.secret_backend,
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}
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vault_ca = data.get('vault_ca')
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if vault_ca:
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ctxt['vault_ca'] = json.loads(vault_ca)
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self.complete = True
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return ctxt
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return {}
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def write_vaultlocker_conf(context, priority=100):
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"""Write vaultlocker configuration to disk and install alternative
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:param context: Dict of data from vault-kv relation
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:ptype: context: dict
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:param priority: Priority of alternative configuration
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:ptype: priority: int"""
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charm_vl_path = "/var/lib/charm/{}/vaultlocker.conf".format(
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hookenv.service_name()
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)
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host.mkdir(os.path.dirname(charm_vl_path), perms=0o700)
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templating.render(source='vaultlocker.conf.j2',
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target=charm_vl_path,
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context=context, perms=0o600),
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alternatives.install_alternative('vaultlocker.conf',
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'/etc/vaultlocker/vaultlocker.conf',
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charm_vl_path, priority)
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def vault_relation_complete(backend=None):
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"""Determine whether vault relation is complete
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:param backend: Name of secrets backend requested
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:ptype backend: string
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:returns: whether the relation to vault is complete
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:rtype: bool"""
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vault_kv = VaultKVContext(secret_backend=backend or VAULTLOCKER_BACKEND)
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vault_kv()
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return vault_kv.complete
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# TODO: contrib a high level unwrap method to hvac that works
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def retrieve_secret_id(url, token):
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"""Retrieve a response-wrapped secret_id from Vault
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:param url: URL to Vault Server
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:ptype url: str
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:param token: One shot Token to use
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:ptype token: str
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:returns: secret_id to use for Vault Access
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:rtype: str"""
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import hvac
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client = hvac.Client(url=url, token=token)
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response = client._post('/v1/sys/wrapping/unwrap')
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if response.status_code == 200:
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data = response.json()
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return data['data']['secret_id']
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