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__init__.py	0 B	-rw-r--r--	2023-12-04 11:47
apport.py	7.05 KB	-rw-r--r--	2023-12-04 11:47
atomic_helper.py	2.45 KB	-rw-r--r--	2023-12-04 11:47
cloud.py	3.22 KB	-rw-r--r--	2023-12-04 11:47
dmi.py	6.77 KB	-rw-r--r--	2023-12-04 11:47
event.py	2 KB	-rw-r--r--	2023-12-04 11:47
features.py	3.38 KB	-rw-r--r--	2023-12-04 11:47
gpg.py	4.28 KB	-rw-r--r--	2023-12-04 11:47
helpers.py	16.41 KB	-rw-r--r--	2023-12-04 11:47
importer.py	2.43 KB	-rw-r--r--	2023-12-04 11:47
log.py	5.47 KB	-rw-r--r--	2023-12-04 11:47
netinfo.py	22.97 KB	-rw-r--r--	2023-12-04 11:47
persistence.py	2.52 KB	-rw-r--r--	2023-12-04 11:47
registry.py	1022 B	-rw-r--r--	2023-12-04 11:47
safeyaml.py	10.28 KB	-rw-r--r--	2023-12-04 11:47
settings.py	2.02 KB	-rw-r--r--	2026-01-23 08:56
signal_handler.py	1.74 KB	-rw-r--r--	2023-12-04 11:47
simpletable.py	1.93 KB	-rw-r--r--	2023-12-04 11:47
ssh_util.py	22.28 KB	-rw-r--r--	2026-01-23 08:56
stages.py	38.88 KB	-rw-r--r--	2026-01-23 08:56
subp.py	13.23 KB	-rw-r--r--	2023-12-04 11:47
temp_utils.py	3.15 KB	-rw-r--r--	2023-12-04 11:47
templater.py	5.95 KB	-rw-r--r--	2023-12-04 11:47
type_utils.py	703 B	-rw-r--r--	2023-12-04 11:47
url_helper.py	27.32 KB	-rw-r--r--	2023-12-04 11:47
user_data.py	14.43 KB	-rw-r--r--	2023-12-04 11:47
util.py	96.43 KB	-rw-r--r--	2023-12-04 11:47
version.py	566 B	-rw-r--r--	2026-01-23 08:56
warnings.py	3.76 KB	-rw-r--r--	2023-12-04 11:47

Rename

# 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"""

import logging
import time

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