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File cc_ssh_authkey_fingerprints.py

# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""SSH AuthKey Fingerprints: Log fingerprints of user SSH keys"""

import base64
import hashlib
import logging

from cloudinit import ssh_util, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.distros import ALL_DISTROS, ug_util
from cloudinit.settings import PER_INSTANCE
from cloudinit.simpletable import SimpleTable

MODULE_DESCRIPTION = """\
Write fingerprints of authorized keys for each user to log. This is enabled by
default, but can be disabled using ``no_ssh_fingerprints``. The hash type for
the keys can be specified, but defaults to ``sha256``.
"""

meta: MetaSchema = {
    "id": "cc_ssh_authkey_fingerprints",
    "name": "SSH AuthKey Fingerprints",
    "title": "Log fingerprints of user SSH keys",
    "description": MODULE_DESCRIPTION,
    "distros": [ALL_DISTROS],
    "frequency": PER_INSTANCE,
    "examples": [
        "no_ssh_fingerprints: true",
        "authkey_hash: sha512",
    ],
    "activate_by_schema_keys": [],
}

__doc__ = get_meta_doc(meta)
LOG = logging.getLogger(__name__)

def _split_hash(bin_hash):
    split_up = []
    for i in range(0, len(bin_hash), 2):
        split_up.append(bin_hash[i : i + 2])
    return split_up

def _gen_fingerprint(b64_text, hash_meth="sha256"):
    if not b64_text:
        return ""
    # TBD(harlowja): Maybe we should feed this into 'ssh -lf'?
    try:
        hasher = hashlib.new(hash_meth)
        hasher.update(base64.b64decode(b64_text))
        return ":".join(_split_hash(hasher.hexdigest()))
    except (TypeError, ValueError):
        # Raised when b64 not really b64...
        # or when the hash type is not really
        # a known/supported hash type...
        return "?"

def _is_printable_key(entry):
    if any([entry.keytype, entry.base64, entry.comment, entry.options]):
        if (
            entry.keytype
            and entry.keytype.lower().strip() in ssh_util.VALID_KEY_TYPES
        ):
            return True
    return False

def _pprint_key_entries(
    user, key_fn, key_entries, hash_meth="sha256", prefix="ci-info: "
):
    if not key_entries:
        message = (
            "%sno authorized SSH keys fingerprints found for user %s.\n"
            % (prefix, user)
        )
        util.multi_log(message, console=True, stderr=False)
        return
    tbl_fields = [
        "Keytype",
        "Fingerprint (%s)" % (hash_meth),
        "Options",
        "Comment",
    ]
    tbl = SimpleTable(tbl_fields)
    for entry in key_entries:
        if _is_printable_key(entry):
            row = [
                entry.keytype or "-",
                _gen_fingerprint(entry.base64, hash_meth) or "-",
                entry.options or "-",
                entry.comment or "-",
            ]
            tbl.add_row(row)
    authtbl_s = tbl.get_string()
    authtbl_lines = authtbl_s.splitlines()
    max_len = len(max(authtbl_lines, key=len))
    lines = [
        util.center(
            "Authorized keys from %s for user %s" % (key_fn, user),
            "+",
            max_len,
        ),
    ]
    lines.extend(authtbl_lines)
    for line in lines:
        util.multi_log(
            text="%s%s\n" % (prefix, line), stderr=False, console=True
        )

def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
    if util.is_true(cfg.get("no_ssh_fingerprints", False)):
        LOG.debug(
            "Skipping module named %s, logging of SSH fingerprints disabled",
            name,
        )
        return

hash_meth = util.get_cfg_option_str(cfg, "authkey_hash", "sha256")
    (users, _groups) = ug_util.normalize_users_groups(cfg, cloud.distro)
    for (user_name, _cfg) in users.items():
        if _cfg.get("no_create_home") or _cfg.get("system"):
            LOG.debug(
                "Skipping printing of ssh fingerprints for user '%s' because "
                "no home directory is created",
                user_name,
            )
            continue

(key_fn, key_entries) = ssh_util.extract_authorized_keys(user_name)
        _pprint_key_entries(user_name, key_fn, key_entries, hash_meth)

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-18 04:32:34
..	DIR	-	drwxr-xr-x	2025-07-18 04:32:34
__pycache__	DIR	-	drwxr-xr-x	2025-07-18 04:32:34
schemas	DIR	-	drwxr-xr-x	2025-07-18 04:32:34
__init__.py	text/plain	14 B	-rw-r--r--	2023-12-04 11:47:40
cc_ansible.py	text/plain	8.69 KB	-rw-r--r--	2023-12-04 11:47:40
cc_apk_configure.py	text/x-script.python	5.66 KB	-rw-r--r--	2023-12-04 11:47:40
cc_apt_configure.py	text/x-script.python	41.99 KB	-rw-r--r--	2023-12-04 11:47:40
cc_apt_pipelining.py	text/x-script.python	2.71 KB	-rw-r--r--	2023-12-04 11:47:40
cc_bootcmd.py	text/x-script.python	2.85 KB	-rw-r--r--	2023-12-04 11:47:40
cc_byobu.py	text/x-script.python	3.65 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ca_certs.py	text/x-script.python	9.13 KB	-rw-r--r--	2025-07-17 07:36:20
cc_chef.py	text/x-script.python	13.77 KB	-rw-r--r--	2023-12-04 11:47:40
cc_disable_ec2_metadata.py	text/x-script.python	2.03 KB	-rw-r--r--	2023-12-04 11:47:40
cc_disk_setup.py	text/x-script.python	32.36 KB	-rw-r--r--	2023-12-04 11:47:40
cc_fan.py	text/x-script.python	3.02 KB	-rw-r--r--	2023-12-04 11:47:40
cc_final_message.py	text/x-script.python	3.39 KB	-rw-r--r--	2023-12-04 11:47:40
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cc_grub_dpkg.py	text/x-script.python	6.65 KB	-rw-r--r--	2023-12-04 11:47:40
cc_install_hotplug.py	text/x-script.python	3.81 KB	-rw-r--r--	2023-12-04 11:47:40
cc_keyboard.py	text/x-script.python	2.38 KB	-rw-r--r--	2023-12-04 11:47:40
cc_keys_to_console.py	text/x-script.python	3.61 KB	-rw-r--r--	2023-12-04 11:47:40
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cc_locale.py	text/x-script.python	1.86 KB	-rw-r--r--	2023-12-04 11:47:40
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cc_mcollective.py	text/x-script.python	6.1 KB	-rw-r--r--	2023-12-04 11:47:40
cc_migrator.py	text/x-script.python	3.49 KB	-rw-r--r--	2023-12-04 11:47:40
cc_mounts.py	text/x-script.python	19.71 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ntp.py	text/x-script.python	20.84 KB	-rw-r--r--	2025-07-17 07:36:20
cc_package_update_upgrade_install.py	text/x-script.python	4.54 KB	-rw-r--r--	2023-12-04 11:47:40
cc_phone_home.py	text/x-script.python	5.48 KB	-rw-r--r--	2023-12-04 11:47:40
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cc_puppet.py	text/x-script.python	14.1 KB	-rw-r--r--	2023-12-04 11:47:40
cc_reset_rmc.py	text/x-script.python	4.47 KB	-rw-r--r--	2023-12-04 11:47:40
cc_resizefs.py	text/x-script.python	10.73 KB	-rw-r--r--	2023-12-04 11:47:40
cc_resolv_conf.py	text/x-script.python	4.98 KB	-rw-r--r--	2025-07-17 07:36:20
cc_rh_subscription.py	text/x-script.python	16.97 KB	-rw-r--r--	2025-07-17 07:36:20
cc_rightscale_userdata.py	text/x-script.python	4.28 KB	-rw-r--r--	2023-12-04 11:47:40
cc_rsyslog.py	text/x-script.python	13.48 KB	-rw-r--r--	2023-12-04 11:47:40
cc_runcmd.py	text/x-script.python	2.9 KB	-rw-r--r--	2023-12-04 11:47:40
cc_salt_minion.py	text/x-script.python	5.88 KB	-rw-r--r--	2023-12-04 11:47:40
cc_scripts_per_boot.py	text/x-script.python	1.66 KB	-rw-r--r--	2023-12-04 11:47:40
cc_scripts_per_instance.py	text/x-script.python	1.81 KB	-rw-r--r--	2023-12-04 11:47:40
cc_scripts_per_once.py	text/x-script.python	1.76 KB	-rw-r--r--	2023-12-04 11:47:40
cc_scripts_user.py	text/x-script.python	1.85 KB	-rw-r--r--	2023-12-04 11:47:40
cc_scripts_vendor.py	text/x-script.python	2.29 KB	-rw-r--r--	2023-12-04 11:47:40
cc_seed_random.py	text/x-script.python	4.72 KB	-rw-r--r--	2023-12-04 11:47:40
cc_set_hostname.py	text/x-script.python	5.13 KB	-rw-r--r--	2023-12-04 11:47:40
cc_set_passwords.py	text/x-script.python	10.97 KB	-rw-r--r--	2023-12-04 11:47:40
cc_snap.py	text/x-script.python	6.3 KB	-rw-r--r--	2023-12-04 11:47:40
cc_spacewalk.py	text/x-script.python	3.43 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ssh.py	text/x-script.python	14.86 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ssh_authkey_fingerprints.py	text/x-script.python	4.22 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ssh_import_id.py	text/x-script.python	6.12 KB	-rw-r--r--	2023-12-04 11:47:40
cc_timezone.py	text/x-script.python	1.46 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ubuntu_advantage.py	text/x-script.python	17 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ubuntu_autoinstall.py	text/x-script.python	4.5 KB	-rw-r--r--	2023-12-04 11:47:40
cc_ubuntu_drivers.py	text/x-script.python	4.56 KB	-rw-r--r--	2023-12-04 11:47:40
cc_update_etc_hosts.py	text/x-script.python	5.16 KB	-rw-r--r--	2023-12-04 11:47:40
cc_update_hostname.py	text/x-script.python	3.87 KB	-rw-r--r--	2023-12-04 11:47:40
cc_users_groups.py	text/x-script.python	8.57 KB	-rw-r--r--	2023-12-04 11:47:40
cc_wireguard.py	text/x-script.python	9.22 KB	-rw-r--r--	2023-12-04 11:47:40
cc_write_files.py	text/x-script.python	6.66 KB	-rw-r--r--	2023-12-04 11:47:40
cc_write_files_deferred.py	text/x-script.python	1.68 KB	-rw-r--r--	2023-12-04 11:47:40
cc_yum_add_repo.py	text/x-script.python	7.45 KB	-rw-r--r--	2023-12-04 11:47:40
cc_zypper_add_repo.py	text/x-script.python	6.59 KB	-rw-r--r--	2023-12-04 11:47:40
modules.py	text/x-script.python	11.74 KB	-rw-r--r--	2023-12-04 11:47:40
schema.py	text/x-script.python	54.85 KB	-rw-r--r--	2023-12-04 11:47:40

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