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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.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 glob
import os
# Ensure this is aliased to a name not 'distros'
# since the module attribute 'distros'
# is a list of distros that are supported, not a sub-module
from cloudinit import distros as ds
from cloudinit import ssh_util
from cloudinit import util
DISABLE_ROOT_OPTS = ("no-port-forwarding,no-agent-forwarding,"
"no-X11-forwarding,command=\"echo \'Please login as the user \\\"$USER\\\" "
"rather than the user \\\"root\\\".\';echo;sleep 10\"")
KEY_2_FILE = {
"rsa_private": ("/etc/ssh/ssh_host_rsa_key", 0600),
"rsa_public": ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
"dsa_private": ("/etc/ssh/ssh_host_dsa_key", 0600),
"dsa_public": ("/etc/ssh/ssh_host_dsa_key.pub", 0644),
"ecdsa_private": ("/etc/ssh/ssh_host_ecdsa_key", 0600),
"ecdsa_public": ("/etc/ssh/ssh_host_ecdsa_key.pub", 0644),
}
PRIV_2_PUB = {
'rsa_private': 'rsa_public',
'dsa_private': 'dsa_public',
'ecdsa_private': 'ecdsa_public',
}
KEY_GEN_TPL = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
GENERATE_KEY_NAMES = ['rsa', 'dsa', 'ecdsa']
KEY_FILE_TPL = '/etc/ssh/ssh_host_%s_key'
def handle(_name, cfg, cloud, log, _args):
# remove the static keys from the pristine image
if cfg.get("ssh_deletekeys", True):
key_pth = os.path.join("/etc/ssh/", "ssh_host_*key*")
for f in glob.glob(key_pth):
try:
util.del_file(f)
except:
util.logexc(log, "Failed deleting key file %s", f)
if "ssh_keys" in cfg:
# if there are keys in cloud-config, use them
for (key, val) in cfg["ssh_keys"].iteritems():
if key in KEY_2_FILE:
tgt_fn = KEY_2_FILE[key][0]
tgt_perms = KEY_2_FILE[key][1]
util.write_file(tgt_fn, val, tgt_perms)
for (priv, pub) in PRIV_2_PUB.iteritems():
if pub in cfg['ssh_keys'] or not priv in cfg['ssh_keys']:
continue
pair = (KEY_2_FILE[priv][0], KEY_2_FILE[pub][0])
cmd = ['sh', '-xc', KEY_GEN_TPL % pair]
try:
# TODO(harlowja): Is this guard needed?
with util.SeLinuxGuard("/etc/ssh", recursive=True):
util.subp(cmd, capture=False)
log.debug("Generated a key for %s from %s", pair[0], pair[1])
except:
util.logexc(log, "Failed generated a key for %s from %s",
pair[0], pair[1])
else:
# if not, generate them
genkeys = util.get_cfg_option_list(cfg,
'ssh_genkeytypes',
GENERATE_KEY_NAMES)
for keytype in genkeys:
keyfile = KEY_FILE_TPL % (keytype)
util.ensure_dir(os.path.dirname(keyfile))
if not os.path.exists(keyfile):
cmd = ['ssh-keygen', '-t', keytype, '-N', '', '-f', keyfile]
try:
# TODO(harlowja): Is this guard needed?
with util.SeLinuxGuard("/etc/ssh", recursive=True):
util.subp(cmd, capture=False)
except:
util.logexc(log, "Failed generating key type %s to "
"file %s", keytype, keyfile)
try:
(users, _groups) = ds.normalize_users_groups(cfg, cloud.distro)
(user, _user_config) = ds.extract_default(users)
disable_root = util.get_cfg_option_bool(cfg, "disable_root", True)
disable_root_opts = util.get_cfg_option_str(cfg, "disable_root_opts",
DISABLE_ROOT_OPTS)
keys = cloud.get_public_ssh_keys() or []
if "ssh_authorized_keys" in cfg:
cfgkeys = cfg["ssh_authorized_keys"]
keys.extend(cfgkeys)
apply_credentials(keys, user, disable_root, disable_root_opts)
except:
util.logexc(log, "Applying ssh credentials failed!")
def apply_credentials(keys, user, disable_root, disable_root_opts):
keys = set(keys)
if user:
ssh_util.setup_user_keys(keys, user)
if disable_root:
if not user:
user = "NONE"
key_prefix = disable_root_opts.replace('$USER', user)
else:
key_prefix = ''
ssh_util.setup_user_keys(keys, 'root', options=key_prefix)
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