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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
# Copyright (C) 2012 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 os
import glob
from cloudinit import util
from cloudinit import ssh_util
DISABLE_ROOT_OPTS = ( "no-port-forwarding,no-agent-forwarding,"
"no-X11-forwarding,command=\"echo \'Please login as the user \\\"$USER\\\" "
"rather than the user \\\"root\\\".\';echo;sleep 10\"")
key2file = {
"rsa_private": ("/etc/ssh/ssh_host_rsa_key", 0600),
"rsa_public": ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
"dsa_private": ("/etc/ssh/ssh_host_dsa_key", 0600),
"dsa_public": ("/etc/ssh/ssh_host_dsa_key.pub", 0644),
"ecdsa_private": ("/etc/ssh/ssh_host_ecdsa_key", 0600),
"ecdsa_public": ("/etc/ssh/ssh_host_ecdsa_key.pub", 0644),
}
priv2pub = {
'rsa_private': 'rsa_public',
'dsa_private': 'dsa_public',
'ecdsa_private': 'ecdsa_public',
}
key_gen_tpl = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
generate_keys = ['rsa', 'dsa', 'ecdsa']
def handle(_name, cfg, cloud, log, _args):
# remove the static keys from the pristine image
if cfg.get("ssh_deletekeys", True):
key_pth = cloud.paths.join(False, "/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 key2file:
tgt_fn = key2file[key][0]
tgt_perms = key2file[key][1]
util.write_file(cloud.paths.join(False, tgt_fn),
val, tgt_perms)
for (priv, pub) in priv2pub.iteritems():
if pub in cfg['ssh_keys'] or not priv in cfg['ssh_keys']:
continue
pair = (key2file[priv][0], key2file[pub][0])
cmd = ['sh', '-xc', key_gen_tpl % pair]
try:
# TODO: 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_keys)
for keytype in genkeys:
keyfile = '/etc/ssh/ssh_host_%s_key' % (keytype)
keyfile = cloud.paths.join(False, keyfile)
util.ensure_dir(os.path.dirname(keyfile))
if not os.path.exists(keyfile):
cmd = ['ssh-keygen', '-t', keytype, '-N', '', '-f', keyfile]
try:
# TODO: 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:
user = util.get_cfg_option_str(cfg, 'user')
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, cloud.paths,
disable_root, disable_root_opts)
except:
util.logexc(log, "Applying ssh credentials failed!")
def apply_credentials(keys, user, paths, disable_root, disable_root_opts):
keys = set(keys)
if user:
ssh_util.setup_user_keys(keys, user, '', paths)
if disable_root and user:
key_prefix = disable_root_opts.replace('$USER', user)
else:
key_prefix = ''
ssh_util.setup_user_keys(keys, 'root', key_prefix, paths)
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