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"""gpg.py - Collection of gpg key related functions"""
# vi: ts=4 expandtab
#
# Copyright (C) 2016 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Christian Ehrhardt <christian.ehrhardt@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from cloudinit import log as logging
from cloudinit import util
LOG = logging.getLogger(__name__)
def export_armour(key):
"""Export gpg key, armoured key gets returned"""
try:
(armour, _) = util.subp(["gpg", "--export", "--armour", key],
capture=True)
except util.ProcessExecutionError as error:
# debug, since it happens for any key not on the system initially
LOG.debug('Failed to export armoured key "%s": %s', key, error)
armour = None
return armour
def receive_key(key, keyserver):
"""Receive gpg key from the specified keyserver"""
LOG.debug('Receive gpg key "%s"', key)
try:
util.subp(["gpg", "--keyserver", keyserver, "--recv-keys", key],
capture=True)
except util.ProcessExecutionError as error:
raise ValueError(('Failed to import key "%s" '
'from server "%s" - error %s') %
(key, keyserver, error))
def delete_key(key):
"""Delete the specified key from the local gpg ring"""
try:
util.subp(["gpg", "--batch", "--yes", "--delete-keys", key],
capture=True)
except util.ProcessExecutionError as error:
LOG.warn('Failed delete key "%s": %s', key, error)
def get_key_by_id(keyid, keyserver="keyserver.ubuntu.com"):
"""get gpg keyid from keyserver"""
armour = export_armour(keyid)
if not armour:
try:
receive_key(keyid, keyserver=keyserver)
armour = export_armour(keyid)
except ValueError:
LOG.exception('Failed to obtain gpg key %s', keyid)
raise
finally:
# delete just imported key to leave environment as it was before
delete_key(keyid)
return armour
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