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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
def handle(name,cfg,cloud,log,args):
# 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])
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)
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)
except:
log.warn("applying credentials failed!\n")
send_ssh_keys_to_console()
def send_ssh_keys_to_console():
send_keys_sh = """
{
echo
echo "#############################################################"
echo "-----BEGIN SSH HOST KEY FINGERPRINTS-----"
ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key.pub
ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub
echo "-----END SSH HOST KEY FINGERPRINTS-----"
echo "#############################################################"
} | logger -p user.info -s -t "ec2"
"""
subprocess.call(('sh', '-c', send_keys_sh))
def apply_credentials(keys, user, disable_root):
keys = set(keys)
if user:
setup_user_keys(keys, user, '')
if disable_root:
key_prefix = 'command="echo \'Please login as the %s user rather than root user.\';echo;sleep 10" ' % 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)
authorized_keys = '%s/.ssh/authorized_keys' % pwent.pw_dir
fp = open(authorized_keys, 'a')
fp.write(''.join(['%s%s\n' % (key_prefix, key) for key in keys]))
fp.close()
os.chown(authorized_keys, pwent.pw_uid, pwent.pw_gid)
os.umask(saved_umask)
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