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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 os
import glob
import subprocess
DISABLE_ROOT_OPTS="no-port-forwarding,no-agent-forwarding,no-X11-forwarding,command=\"echo \'Please login as the user \\\"$USER\\\" rather than the user \\\"root\\\".\';echo;sleep 10\""
global_log = None
def handle(name,cfg,cloud,log,args):
global global_log
global_log = log
# remove the static keys from the pristine image
for f in glob.glob("/etc/ssh/ssh_host_*_key*"):
try: os.unlink(f)
except: pass
if cfg.has_key("ssh_keys"):
# if there are keys in cloud-config, use them
key2file = {
"rsa_private" : ("/etc/ssh/ssh_host_rsa_key", 0600),
"rsa_public" : ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
"dsa_private" : ("/etc/ssh/ssh_host_dsa_key", 0600),
"dsa_public" : ("/etc/ssh/ssh_host_dsa_key.pub", 0644)
}
for key,val in cfg["ssh_keys"].items():
if key2file.has_key(key):
util.write_file(key2file[key][0],val,key2file[key][1])
priv2pub = { 'rsa_private':'rsa_public', 'dsa_private':'dsa_public' }
cmd = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
for priv,pub in priv2pub.iteritems():
if pub in cfg['ssh_keys'] or not priv in cfg['ssh_keys']: continue
pair=(key2file[priv][0], key2file[pub][0])
subprocess.call(('sh', '-xc', cmd % pair))
log.debug("generated %s from %s" % pair)
else:
# if not, generate them
genkeys ='ssh-keygen -f /etc/ssh/ssh_host_rsa_key -t rsa -N ""; '
genkeys+='ssh-keygen -f /etc/ssh/ssh_host_dsa_key -t dsa -N ""; '
subprocess.call(('sh', '-c', "{ %s } </dev/null" % (genkeys)))
try:
user = util.get_cfg_option_str(cfg,'user')
disable_root = util.get_cfg_option_bool(cfg, "disable_root", True)
disable_root_opts = util.get_cfg_option_str(cfg, "disable_root_opts",
DISABLE_ROOT_OPTS)
keys = cloud.get_public_ssh_keys()
if cfg.has_key("ssh_authorized_keys"):
cfgkeys = cfg["ssh_authorized_keys"]
keys.extend(cfgkeys)
apply_credentials(keys,user,disable_root, disable_root_opts)
except:
util.logexc(log)
log.warn("applying credentials failed!\n")
send_ssh_keys_to_console()
def send_ssh_keys_to_console():
subprocess.call(('/usr/lib/cloud-init/write-ssh-key-fingerprints',))
def apply_credentials(keys, user, disable_root, disable_root_opts=DISABLE_ROOT_OPTS):
keys = set(keys)
if user:
setup_user_keys(keys, user, '')
if disable_root:
key_prefix = disable_root_opts.replace('$USER', user)
else:
key_prefix = ''
setup_user_keys(keys, 'root', key_prefix)
def setup_user_keys(keys, user, key_prefix):
import pwd
saved_umask = os.umask(077)
pwent = pwd.getpwnam(user)
ssh_dir = '%s/.ssh' % pwent.pw_dir
if not os.path.exists(ssh_dir):
os.mkdir(ssh_dir)
os.chown(ssh_dir, pwent.pw_uid, pwent.pw_gid)
try:
ssh_cfg = parse_ssh_config()
akeys = ssh_cfg.get("AuthorizedKeysFile","%h/.ssh/authorized_keys")
akeys = akeys.replace("%h", pwent.pw_dir)
akeys = akeys.replace("%u", user)
authorized_keys = akeys
except Exception as e:
authorized_keys = '%s/.ssh/authorized_keys' % pwent.pw_dir
util.logexc(global_log)
fp = open(authorized_keys, 'a')
key_prefix = key_prefix.replace("\n"," ")
fp.write(''.join(['%s %s\n' % (key_prefix.strip(), key) for key in keys]))
fp.close()
os.chown(authorized_keys, pwent.pw_uid, pwent.pw_gid)
os.umask(saved_umask)
def parse_ssh_config(fname="/etc/ssh/sshd_config"):
ret = { }
fp=open(fname)
for l in fp.readlines():
l = l.strip()
if not l or l.startswith("#"):
continue
key,val = l.split(None,1)
ret[key]=val
fp.close()
return(ret)
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