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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.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 cloudinit.util as util
import cloudinit.SshUtil as sshutil
import os
import glob
import subprocess
DISABLE_ROOT_OPTS = "no-port-forwarding,no-agent-forwarding," \
"no-X11-forwarding,command=\"echo \'Please login as the user \\\"$USER\\\" " \
"rather than the user \\\"root\\\".\';echo;sleep 10\""
def handle(_name, cfg, cloud, log, _args):
# remove the static keys from the pristine image
if cfg.get("ssh_deletekeys", True):
for f in glob.glob("/etc/ssh/ssh_host_*key*"):
try:
os.unlink(f)
except:
pass
if "ssh_keys" in cfg:
# if there are keys in cloud-config, use them
key2file = {
"rsa_private": ("/etc/ssh/ssh_host_rsa_key", 0600),
"rsa_public": ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
"dsa_private": ("/etc/ssh/ssh_host_dsa_key", 0600),
"dsa_public": ("/etc/ssh/ssh_host_dsa_key.pub", 0644),
"ecdsa_private": ("/etc/ssh/ssh_host_ecdsa_key", 0600),
"ecdsa_public": ("/etc/ssh/ssh_host_ecdsa_key.pub", 0644),
}
for key, val in cfg["ssh_keys"].items():
if key in key2file:
util.write_file(key2file[key][0], val, key2file[key][1])
priv2pub = {'rsa_private': 'rsa_public', 'dsa_private': 'dsa_public',
'ecdsa_private': 'ecdsa_public', }
cmd = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
for priv, pub in priv2pub.iteritems():
if pub in cfg['ssh_keys'] or not priv in cfg['ssh_keys']:
continue
pair = (key2file[priv][0], key2file[pub][0])
subprocess.call(('sh', '-xc', cmd % pair))
log.debug("generated %s from %s" % pair)
else:
# if not, generate them
for keytype in util.get_cfg_option_list_or_str(cfg, 'ssh_genkeytypes',
['rsa', 'dsa', 'ecdsa']):
keyfile = '/etc/ssh/ssh_host_%s_key' % keytype
if not os.path.exists(keyfile):
subprocess.call(['ssh-keygen', '-t', keytype, '-N', '',
'-f', keyfile])
util.restorecon_if_possible('/etc/ssh', recursive=True)
try:
user = util.get_cfg_option_str(cfg, 'user')
disable_root = util.get_cfg_option_bool(cfg, "disable_root", True)
disable_root_opts = util.get_cfg_option_str(cfg, "disable_root_opts",
DISABLE_ROOT_OPTS)
keys = cloud.get_public_ssh_keys()
if "ssh_authorized_keys" in cfg:
cfgkeys = cfg["ssh_authorized_keys"]
keys.extend(cfgkeys)
apply_credentials(keys, user, disable_root, disable_root_opts, log)
except:
util.logexc(log)
log.warn("applying credentials failed!\n")
def apply_credentials(keys, user, disable_root,
disable_root_opts=DISABLE_ROOT_OPTS, log=None):
keys = set(keys)
if user:
sshutil.setup_user_keys(keys, user, '', log)
if disable_root:
key_prefix = disable_root_opts.replace('$USER', user)
else:
key_prefix = ''
sshutil.setup_user_keys(keys, 'root', key_prefix, log)
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