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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2މ$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ# Copyright (C) 2016 Canonical Ltd. # # Author: Scott Moser # Author: Christian Ehrhardt # # This file is part of cloud-init. See LICENSE file for license information. """gpg.py - Collection of gpg key related functions""" import time from cloudinit import log as logging from cloudinit import subp LOG = logging.getLogger(__name__) GPG_LIST = [ "gpg", "--with-fingerprint", "--no-default-keyring", "--list-keys", "--keyring", ] 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 dearmor(key): """Dearmor gpg key, dearmored key gets returned note: man gpg(1) makes no mention of an --armour spelling, only --armor """ return subp.subp(["gpg", "--dearmor"], data=key, decode=False).stdout def list(key_file, human_output=False): """List keys from a keyring with fingerprints. Default to a stable machine parseable format. @param key_file: a string containing a filepath to a key @param human_output: return output intended for human parsing """ cmd = [] cmd.extend(GPG_LIST) if not human_output: cmd.append("--with-colons") cmd.append(key_file) (stdout, stderr) = subp.subp(cmd, capture=True) if stderr: LOG.warning('Failed to export armoured key "%s": %s', key_file, stderr) return stdout 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