692 lines
22 KiB
Python
692 lines
22 KiB
Python
import base64
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import psycopg2
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import subprocess
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import tenacity
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from charmhelpers.contrib.charmsupport.nrpe import (
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NRPE,
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add_init_service_checks,
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get_nagios_hostname,
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get_nagios_unit_name,
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)
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from charmhelpers.core.hookenv import (
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DEBUG,
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ERROR,
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config,
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log,
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network_get_primary_address,
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open_port,
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status_set,
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unit_private_ip,
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application_version_set,
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atexit,
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local_unit,
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)
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from charmhelpers.core.host import (
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service,
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service_restart,
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service_running,
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write_file,
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is_container,
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)
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from charmhelpers.core.templating import (
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render,
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)
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from charms.reactive import (
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hook,
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is_state,
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remove_state,
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set_state,
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when,
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when_file_changed,
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when_not,
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when_any,
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)
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from charms.reactive.relations import (
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endpoint_from_flag,
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)
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from charms.reactive.flags import (
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is_flag_set,
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set_flag,
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clear_flag,
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)
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from charms.layer import snap
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import lib.charm.vault as vault
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import lib.charm.vault_pki as vault_pki
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# See https://www.vaultproject.io/docs/configuration/storage/postgresql.html
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VAULT_TABLE_DDL = """
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CREATE TABLE IF NOT EXISTS vault_kv_store (
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parent_path TEXT COLLATE "C" NOT NULL,
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path TEXT COLLATE "C",
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key TEXT COLLATE "C",
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value BYTEA,
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CONSTRAINT pkey PRIMARY KEY (path, key)
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);
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"""
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VAULT_INDEX_DDL = """
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CREATE INDEX IF NOT EXISTS parent_path_idx ON vault_kv_store (parent_path);
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"""
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OPTIONAL_INTERFACES = [
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['etcd'],
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]
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REQUIRED_INTERFACES = [
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['shared-db', 'db.master']
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]
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VAULT_CONFIG = '/var/snap/vault/common/vault.hcl'
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VAULT_SYSTEMD_CONFIG = '/etc/systemd/system/vault.service'
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def ssl_available(config):
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if '' in (config['ssl-cert'], config['ssl-key']):
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return False
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return True
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def save_etcd_client_credentials(etcd, key, cert, ca):
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"""Save etcd TLS key, cert and ca to disk"""
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credentials = etcd.get_client_credentials()
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write_file(key, credentials['client_key'], perms=0o600)
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write_file(cert, credentials['client_cert'], perms=0o600)
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write_file(ca, credentials['client_ca'], perms=0o600)
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def validate_snap_channel(channel):
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"""Validate a provided snap channel
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Any prefix is ignored ('0.10' in '0.10/stable' for example).
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:param: channel: string of the snap channel to validate
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:returns: boolean: whether provided channel is valid
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"""
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channel_suffix = channel.split('/')[-1]
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if channel_suffix not in ('stable', 'candidate', 'beta', 'edge'):
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return False
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return True
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@when_not('snap.installed.vault')
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def snap_install():
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channel = config('channel') or 'stable'
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if validate_snap_channel(channel):
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clear_flag('snap.channel.invalid')
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snap.install('vault', channel=channel)
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else:
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set_flag('snap.channel.invalid')
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@when('config.changed.channel')
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@when('snap.installed.vault')
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def snap_refresh():
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channel = config('channel') or 'stable'
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if validate_snap_channel(channel):
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clear_flag('snap.channel.invalid')
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snap.refresh('vault', channel=channel)
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if vault.can_restart():
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log("Restarting vault", level=DEBUG)
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service_restart('vault')
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if config('totally-unsecure-auto-unlock'):
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vault.prepare_vault()
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else:
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set_flag('snap.channel.invalid')
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def configure_vault(context):
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log("Running configure_vault", level=DEBUG)
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context['disable_mlock'] = is_container() or config('disable-mlock')
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context['ssl_available'] = is_state('vault.ssl.available')
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if is_flag_set('etcd.tls.available'):
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etcd = endpoint_from_flag('etcd.available')
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log("Etcd detected, adding to context", level=DEBUG)
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context['etcd_conn'] = etcd.connection_string()
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context['etcd_tls_ca_file'] = '/var/snap/vault/common/etcd-ca.pem'
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context['etcd_tls_cert_file'] = '/var/snap/vault/common/etcd-cert.pem'
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context['etcd_tls_key_file'] = '/var/snap/vault/common/etcd.key'
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save_etcd_client_credentials(etcd,
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key=context['etcd_tls_key_file'],
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cert=context['etcd_tls_cert_file'],
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ca=context['etcd_tls_ca_file'])
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context['api_addr'] = vault.get_api_url()
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context['cluster_addr'] = vault.get_cluster_url()
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log("Etcd detected, setting api_addr to {}".format(
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context['api_addr']))
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else:
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log("Etcd not detected", level=DEBUG)
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log("Rendering vault.hcl.j2", level=DEBUG)
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render(
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'vault.hcl.j2',
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VAULT_CONFIG,
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context,
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perms=0o600)
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log("Rendering vault systemd configuation", level=DEBUG)
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render(
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'vault.service.j2',
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VAULT_SYSTEMD_CONFIG,
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{},
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perms=0o644)
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service('enable', 'vault')
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log("Opening vault port", level=DEBUG)
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open_port(8200)
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set_flag('configured')
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@when('snap.installed.vault')
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@when('db.master.available')
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@when('vault.schema.created')
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@when('vault.ssl.configured')
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def configure_vault_psql(psql):
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context = {
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'storage_name': 'psql',
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'psql_db_conn': psql.master,
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}
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configure_vault(context)
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@when('snap.installed.vault')
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@when('shared-db.available')
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@when('vault.ssl.configured')
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def configure_vault_mysql(mysql):
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if local_unit() not in mysql.allowed_units():
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log("Deferring vault configuration until"
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" MySQL access is granted", level=DEBUG)
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return
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context = {
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'storage_name': 'mysql',
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'mysql_db_relation': mysql,
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}
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configure_vault(context)
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@when('config.changed.disable-mlock')
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def disable_mlock_changed():
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remove_state('configured')
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@hook('upgrade-charm')
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def upgrade_charm():
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remove_state('configured')
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remove_state('vault.nrpe.configured')
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remove_state('vault.ssl.configured')
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@when('db.connected')
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def request_db(pgsql):
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pgsql.set_database('vault')
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@when('shared-db.connected')
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def mysql_setup(database):
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"""Handle the default database connection setup
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"""
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db = {
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'database': 'vault',
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'username': 'vault',
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}
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database.configure(**db)
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@when('db.master.available')
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@when_not('vault.schema.created')
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def create_vault_table(pgsql):
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status_set('maintenance', 'connecting to database')
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conn = psycopg2.connect(str(pgsql.master))
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cur = conn.cursor()
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status_set('maintenance', 'creating vault table')
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cur.execute(VAULT_TABLE_DDL)
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status_set('maintenance', 'creating vault index')
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cur.execute(VAULT_INDEX_DDL)
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status_set('maintenance', 'committing database schema')
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conn.commit()
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cur.close()
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conn.close()
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set_state('vault.schema.created')
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status_set('active', 'database schema created and committed')
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@when_not('db.master.available')
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def database_not_ready():
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remove_state('vault.schema.created')
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@when('snap.installed.vault')
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@when_not('vault.ssl.configured')
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def configure_ssl():
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c = config()
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if ssl_available(c):
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status_set('maintenance', 'installing SSL key and cert')
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ssl_key = base64.decodestring(c['ssl-key'].encode())
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write_file('/var/snap/vault/common/vault.key', ssl_key, perms=0o600)
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ssl_cert = base64.decodestring(c['ssl-cert'].encode())
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if c['ssl-chain']:
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ssl_cert = ssl_cert + base64.decodestring(c['ssl-chain'].encode())
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write_file('/var/snap/vault/common/vault.crt', ssl_cert, perms=0o600)
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set_state('vault.ssl.available')
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else:
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remove_state('vault.ssl.available')
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if c['ssl-ca']:
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ssl_ca = base64.decodestring(c['ssl-ca'].encode())
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write_file('/usr/local/share/ca-certificates/vault-ca.crt',
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ssl_ca, perms=0o644)
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subprocess.check_call(['update-ca-certificates', '--fresh'])
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set_state('vault.ssl.configured')
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remove_state('configured')
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@when('config.changed.ssl-cert')
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def ssl_cert_changed():
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remove_state('vault.ssl.configured')
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@when('config.changed.ssl-chain')
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def ssl_chain_changed():
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remove_state('vault.ssl.configured')
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@when('config.changed.ssl-key')
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def ssl_key_changed():
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remove_state('vault.ssl.configured')
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@when('config.changed.ssl-ca')
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def ssl_ca_changed():
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remove_state('vault.ssl.configured')
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@when('configured')
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@when('nrpe-external-master.available')
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@when_not('vault.nrpe.configured')
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def update_nagios(svc):
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status_set('maintenance', 'configuring Nagios checks')
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hostname = get_nagios_hostname()
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current_unit = get_nagios_unit_name()
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nrpe = NRPE(hostname=hostname)
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add_init_service_checks(nrpe, ['vault'], current_unit)
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write_file(
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'/usr/lib/nagios/plugins/check_vault_version.py',
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open('files/nagios/check_vault_version.py', 'rb').read(),
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perms=0o755)
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nrpe.add_check(
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'vault_version',
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'Check running vault server version is same as installed snap',
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'/usr/lib/nagios/plugins/check_vault_version.py',
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)
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nrpe.write()
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set_state('vault.nrpe.configured')
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@when('config.changed.nagios_context')
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def nagios_context_changed():
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remove_state('vault.nrpe.configured')
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@when('config.changed.nagios_servicegroups')
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def nagios_servicegroups_changed():
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remove_state('vault.nrpe.configured')
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@when('ha.connected')
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def cluster_connected(hacluster):
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"""Configure HA resources in corosync"""
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vip = config('vip')
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dns_record = config('dns-ha-access-record')
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if vip and dns_record:
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set_flag('config.dns_vip.invalid')
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log("Unsupported configuration. vip and dns-ha cannot both be set",
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level=ERROR)
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return
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else:
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clear_flag('config.dns_vip.invalid')
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if vip:
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hacluster.add_vip('vault', vip)
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elif dns_record:
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try:
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ip = network_get_primary_address('access')
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except NotImplementedError:
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ip = unit_private_ip()
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hacluster.add_dnsha('vault', ip, dns_record, 'access')
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hacluster.bind_resources()
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@when_file_changed(VAULT_CONFIG, VAULT_SYSTEMD_CONFIG)
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def file_change_auto_unlock_mode():
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log("Calling opportunistic_restart", level=DEBUG)
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vault.opportunistic_restart()
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if config('totally-unsecure-auto-unlock'):
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vault.prepare_vault()
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@when('leadership.is_leader')
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@when_any('endpoint.secrets.new-request', 'secrets.refresh')
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def configure_secrets_backend():
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""" Process requests for setup and access to simple kv secret backends """
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@tenacity.retry(wait=tenacity.wait_exponential(multiplier=1, max=10),
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stop=tenacity.stop_after_attempt(10),
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reraise=True)
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def _check_vault_status(client):
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if (not service_running('vault') or
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not client.is_initialized() or
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client.is_sealed()):
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return False
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return True
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# NOTE: use localhost listener as policy only allows 127.0.0.1 to
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# administer the local vault instances via the charm
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client = vault.get_client(url=vault.VAULT_LOCALHOST_URL)
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status_ok = _check_vault_status(client)
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if not status_ok:
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log('Unable to process new secret backend requests,'
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' deferring until vault is fully configured', level=DEBUG)
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return
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charm_role_id = vault.get_local_charm_access_role_id()
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if charm_role_id is None:
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log('Charm access to vault not configured, deferring'
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' secrets backend setup', level=DEBUG)
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return
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client.auth_approle(charm_role_id)
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secrets = (endpoint_from_flag('endpoint.secrets.new-request') or
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endpoint_from_flag('secrets.connected'))
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requests = secrets.requests()
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# Configure KV secret backends
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backends = set([request['secret_backend']
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for request in requests])
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for backend in backends:
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if not backend.startswith('charm-'):
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continue
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vault.configure_secret_backend(client, name=backend)
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refresh_secrets = is_flag_set('secrets.refresh')
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# Configure AppRoles for application unit access
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for request in requests:
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# NOTE: backends must start with charm-
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backend_name = request['secret_backend']
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if not backend_name.startswith('charm-'):
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continue
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unit = request['unit']
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hostname = request['hostname']
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access_address = request['access_address']
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isolated = request['isolated']
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unit_name = unit.unit_name.replace('/', '-')
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policy_name = approle_name = 'charm-{}'.format(unit_name)
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if isolated:
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policy_template = vault.SECRET_BACKEND_HCL
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else:
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policy_template = vault.SECRET_BACKEND_SHARED_HCL
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vault.configure_policy(
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client,
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name=policy_name,
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hcl=policy_template.format(backend=backend_name,
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hostname=hostname)
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)
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cidr = '{}/32'.format(access_address)
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new_role = (approle_name not in client.list_roles())
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approle_id = vault.configure_approle(
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client,
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name=approle_name,
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cidr=cidr,
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policies=[policy_name])
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if new_role or refresh_secrets:
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wrapped_secret = vault.generate_role_secret_id(
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client,
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name=approle_name,
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cidr=cidr
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)
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secrets.set_role_id(unit=unit,
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role_id=approle_id,
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token=wrapped_secret)
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clear_flag('endpoint.secrets.new-request')
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clear_flag('secrets.refresh')
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@when('secrets.connected')
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def send_vault_url_and_ca():
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secrets = endpoint_from_flag('secrets.connected')
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if is_flag_set('ha.available'):
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vault_url = vault.get_api_url(address=config('vip'))
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else:
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vault_url = vault.get_api_url()
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secrets.publish_url(vault_url=vault_url)
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if config('ssl-ca'):
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secrets.publish_ca(vault_ca=config('ssl-ca'))
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@when('snap.installed.vault')
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def prime_assess_status():
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atexit(_assess_status)
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def _assess_interface(interface, optional,
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missing_interfaces, incomplete_interfaces):
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"""Assess a named interface for presence and completeness
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Uses reactive flags 'connected' and 'available' to indicate whether
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an interface is present and complete.
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:param: interface: Name of interface to assess.
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:param: options: Boolean indicating whether interface is optional
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:param: missing_interfaces: List of missing interfaces to update
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:param: incomplete_interfaces: List of incomplete interfaces to update
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:returns: bool, bool: Tuple of booleans indicating (missing, incomplete)
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"""
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log("Assessing interface {}".format(interface), level=DEBUG)
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base_name = interface.split('.')[0]
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connected = (
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is_flag_set('{}.connected'.format(interface)) or
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is_flag_set('{}.connected'.format(base_name))
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)
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missing = False
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incomplete = False
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if not connected:
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if not optional:
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missing_interfaces.append(base_name)
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missing = True
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incomplete = True
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elif connected and not is_flag_set('{}.available'.format(interface)):
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incomplete_interfaces.append(base_name)
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incomplete = True
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return (missing, incomplete)
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def _assess_interface_groups(interfaces, optional,
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missing_interfaces, incomplete_interfaces):
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"""Assess the relation state of a list of interface groups
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:param: interfaces: List of interface groups
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:param: options: Boolean indicating whether interfaces are optional
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:param: missing_interfaces: List of missing interfaces to update
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:param: incomplete_interfaces: List of incomplete interfaces to update
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"""
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for interface_group in interfaces:
|
|
log("Processing interface group: {}".format(interface_group),
|
|
level=DEBUG)
|
|
_potentially_missing = []
|
|
_potentially_incomplete = []
|
|
for interface in interface_group:
|
|
missing, incomplete = _assess_interface(
|
|
interface=interface, optional=optional,
|
|
missing_interfaces=_potentially_missing,
|
|
incomplete_interfaces=_potentially_incomplete)
|
|
if not missing and not incomplete:
|
|
break
|
|
else:
|
|
# NOTE(jamespage): If an interface group has an incomplete
|
|
# interface then the end user has made a
|
|
# choice as to which interface to use, so
|
|
# don't flag any interfaces as missing.
|
|
if (not optional and
|
|
_potentially_missing and not _potentially_incomplete):
|
|
formatted_interfaces = [
|
|
"'{}'".format(i) for i in _potentially_missing
|
|
]
|
|
missing_interfaces.append(
|
|
"{} missing".format(' or '.join(formatted_interfaces))
|
|
)
|
|
|
|
# NOTE(jamespage): Only display interfaces as incomplete if
|
|
# if they are not in the missing interfaces
|
|
# list for this interface group.
|
|
if _potentially_incomplete:
|
|
filtered_interfaces = [
|
|
i for i in _potentially_incomplete
|
|
if i not in _potentially_missing
|
|
]
|
|
formatted_interfaces = [
|
|
"'{}'".format(i) for i in filtered_interfaces
|
|
]
|
|
incomplete_interfaces.append(
|
|
"{} incomplete".format(' or '.join(formatted_interfaces))
|
|
)
|
|
|
|
|
|
def _assess_status():
|
|
"""Assess status of relations and services for local unit"""
|
|
if is_flag_set('snap.channel.invalid'):
|
|
status_set('blocked',
|
|
'Invalid snap channel '
|
|
'configured: {}'.format(config('channel')))
|
|
return
|
|
if is_flag_set('config.dns_vip.invalid'):
|
|
status_set('blocked',
|
|
'vip and dns-ha-access-record configured')
|
|
return
|
|
|
|
health = None
|
|
if service_running('vault'):
|
|
health = vault.get_vault_health()
|
|
application_version_set(health.get('version'))
|
|
|
|
_missing_interfaces = []
|
|
_incomplete_interfaces = []
|
|
|
|
_assess_interface_groups(REQUIRED_INTERFACES, optional=False,
|
|
missing_interfaces=_missing_interfaces,
|
|
incomplete_interfaces=_incomplete_interfaces)
|
|
|
|
_assess_interface_groups(OPTIONAL_INTERFACES, optional=True,
|
|
missing_interfaces=_missing_interfaces,
|
|
incomplete_interfaces=_incomplete_interfaces)
|
|
|
|
if _missing_interfaces or _incomplete_interfaces:
|
|
state = 'blocked' if _missing_interfaces else 'waiting'
|
|
status_set(state, ', '.join(_missing_interfaces +
|
|
_incomplete_interfaces))
|
|
return
|
|
|
|
if not service_running('vault'):
|
|
status_set('blocked', 'Vault service not running')
|
|
return
|
|
|
|
if not health['initialized']:
|
|
status_set('blocked', 'Vault needs to be initialized')
|
|
return
|
|
|
|
if health['sealed']:
|
|
status_set('blocked', 'Unit is sealed')
|
|
return
|
|
|
|
mlock_disabled = is_container() or config('disable-mlock')
|
|
|
|
status_set(
|
|
'active',
|
|
'Unit is ready '
|
|
'(active: {}, mlock: {})'.format(
|
|
str(not health['standby']).lower(),
|
|
'disabled' if mlock_disabled else 'enabled'
|
|
)
|
|
)
|
|
|
|
|
|
@when('leadership.is_leader')
|
|
@when_any('certificates.server.cert.requested',
|
|
'certificates.reissue.requested')
|
|
def create_server_cert():
|
|
if not vault.vault_ready_for_clients():
|
|
log('Unable to process new secret backend requests,'
|
|
' deferring until vault is fully configured', level=DEBUG)
|
|
return
|
|
reissue_requested = is_flag_set('certificates.reissue.requested')
|
|
tls = endpoint_from_flag('certificates.available')
|
|
server_requests = tls.get_server_requests()
|
|
for unit_name, request in server_requests.items():
|
|
log(
|
|
'Processing certificate requests from {}'.format(unit_name),
|
|
level=DEBUG)
|
|
# Process request for a single certificate
|
|
cn = request.get('common_name')
|
|
sans = request.get('sans')
|
|
if cn and sans:
|
|
log(
|
|
'Processing single certificate requests for {}'.format(cn),
|
|
level=DEBUG)
|
|
try:
|
|
bundle = vault_pki.process_cert_request(
|
|
cn,
|
|
sans,
|
|
unit_name,
|
|
reissue_requested)
|
|
except vault.VaultNotReady:
|
|
# Cannot continue if vault is not ready
|
|
return
|
|
# Set the certificate and key for the unit on the relationship.
|
|
tls.set_server_cert(
|
|
unit_name,
|
|
bundle['certificate'],
|
|
bundle['private_key'])
|
|
# Process request for a batch of certificates
|
|
cert_requests = request.get('cert_requests')
|
|
if cert_requests:
|
|
log(
|
|
'Processing batch of requests from {}'.format(unit_name),
|
|
level=DEBUG)
|
|
for cn, crequest in cert_requests.items():
|
|
log('Processing requests for {}'.format(cn), level=DEBUG)
|
|
try:
|
|
bundle = vault_pki.process_cert_request(
|
|
cn,
|
|
crequest.get('sans'),
|
|
unit_name,
|
|
reissue_requested)
|
|
except vault.VaultNotReady:
|
|
# Cannot continue if vault is not ready
|
|
return
|
|
tls.add_server_cert(
|
|
unit_name,
|
|
cn,
|
|
bundle['certificate'],
|
|
bundle['private_key'])
|
|
tls.set_server_multicerts(unit_name)
|
|
tls.set_ca(vault_pki.get_ca())
|
|
chain = vault_pki.get_chain()
|
|
if chain:
|
|
tls.set_chain(chain)
|
|
clear_flag('certificates.reissue.requested')
|