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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.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/>.
import base64
import glob
import hashlib
import os
from prettytable import PrettyTable
from cloudinit import util
from cloudinit import ssh_util
FP_HASH_TYPE = 'md5'
FP_SEGMENT_LEN = 2
FP_SEGMENT_SEP = ":"
def _split_hash(bin_hash):
split_up = []
for i in xrange(0, len(bin_hash), FP_SEGMENT_LEN):
split_up.append(bin_hash[i:i+FP_SEGMENT_LEN])
return split_up
def _gen_fingerprint(b64_text):
if not b64_text:
return ''
# Maybe we should feed this into 'ssh -lf'?
try:
bin_text = base64.b64decode(b64_text)
hasher = hashlib.new(FP_HASH_TYPE)
hasher.update(bin_text)
pp_hash = FP_SEGMENT_SEP.join(_split_hash(hasher.hexdigest()))
return pp_hash
except TypeError:
return ''
def _pprint_key_entries(user, key_fn, key_entries, prefix='ci-info: '):
if not key_entries:
message = "%sno authorized ssh keys fingerprints found for user %s." % (prefix, user)
util.multi_log(message)
return
tbl_fields = ['Keytype', 'Fingerprint', 'Options', 'Comment']
tbl = PrettyTable(tbl_fields)
for entry in key_entries:
row = []
row.append(entry.keytype or '-')
row.append(_gen_fingerprint(entry.base64) or '-')
row.append(entry.comment or '-')
row.append(entry.options or '-')
tbl.add_row(row)
authtbl_s = tbl.get_string()
max_len = len(max(authtbl_s.splitlines(), key=len))
lines = [
util.center("Authorized keys fingerprints from %s for user %s" % (key_fn, user), "+", max_len),
]
lines.extend(authtbl_s.splitlines())
for line in lines:
util.multi_log(text="%s%s\n" % (prefix, line))
def handle(name, cfg, cloud, log, _args):
if 'no_ssh_fingerprints' in cfg:
log.debug(("Skipping module named %s, "
"logging of ssh fingerprints disabled"), name)
user = util.get_cfg_option_str(cfg, "user", "ubuntu")
(auth_key_fn, auth_key_entries) = ssh_util.extract_authorized_keys(user, cloud.paths)
_pprint_key_entries(user, auth_key_fn, auth_key_entries)
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