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Filename: //lib/python3/dist-packages/cloudinit/gpg.py
# Copyright (C) 2016 Canonical Ltd. # # Author: Scott Moser <scott.moser@canonical.com> # Author: Christian Ehrhardt <christian.ehrhardt@canonical.com> # # This file is part of cloud-init. See LICENSE file for license information. """gpg.py - Collection of gpg key related functions""" from cloudinit import log as logging from cloudinit import subp import time LOG = logging.getLogger(__name__) def export_armour(key): """Export gpg key, armoured key gets returned""" try: (armour, _) = subp.subp(["gpg", "--export", "--armour", key], capture=True) except subp.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 recv_key(key, keyserver, retries=(1, 1)): """Receive gpg key from the specified keyserver. Retries are done by default because keyservers can be unreliable. Additionally, there is no way to determine the difference between a non-existant key and a failure. In both cases gpg (at least 2.2.4) exits with status 2 and stderr: "keyserver receive failed: No data" It is assumed that a key provided to cloud-init exists on the keyserver so re-trying makes better sense than failing. @param key: a string key fingerprint (as passed to gpg --recv-keys). @param keyserver: the keyserver to request keys from. @param retries: an iterable of sleep lengths for retries. Use None to indicate no retries.""" LOG.debug("Importing key '%s' from keyserver '%s'", key, keyserver) cmd = ["gpg", "--no-tty", "--keyserver=%s" % keyserver, "--recv-keys", key] if retries is None: retries = [] trynum = 0 error = None sleeps = iter(retries) while True: trynum += 1 try: subp.subp(cmd, capture=True) LOG.debug("Imported key '%s' from keyserver '%s' on try %d", key, keyserver, trynum) return except subp.ProcessExecutionError as e: error = e try: naplen = next(sleeps) LOG.debug( "Import failed with exit code %d, will try again in %ss", error.exit_code, naplen) time.sleep(naplen) except StopIteration as e: raise ValueError( ("Failed to import key '%s' from keyserver '%s' " "after %d tries: %s") % (key, keyserver, trynum, error) ) from e def delete_key(key): """Delete the specified key from the local gpg ring""" try: subp.subp(["gpg", "--batch", "--yes", "--delete-keys", key], capture=True) except subp.ProcessExecutionError as error: LOG.warning('Failed delete key "%s": %s', key, error) def getkeybyid(keyid, keyserver='keyserver.ubuntu.com'): """get gpg keyid from keyserver""" armour = export_armour(keyid) if not armour: try: recv_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 # vi: ts=4 expandtab
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