95bc6e77e8
given rsa_private_key, rsa_public_key is not needed in the ssh element of cloud-config. instead, it can be generated with ssh-keygen -yf
106 lines
3.6 KiB
Python
106 lines
3.6 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2009-2010 Canonical Ltd.
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#
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# Author: Scott Moser <scott.moser@canonical.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import cloudinit.util as util
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import os
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import glob
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import subprocess
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def handle(name,cfg,cloud,log,args):
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# remove the static keys from the pristine image
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for f in glob.glob("/etc/ssh/ssh_host_*_key*"):
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try: os.unlink(f)
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except: pass
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if cfg.has_key("ssh_keys"):
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# if there are keys in cloud-config, use them
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key2file = {
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"rsa_private" : ("/etc/ssh/ssh_host_rsa_key", 0600),
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"rsa_public" : ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
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"dsa_private" : ("/etc/ssh/ssh_host_dsa_key", 0600),
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"dsa_public" : ("/etc/ssh/ssh_host_dsa_key.pub", 0644)
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}
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for key,val in cfg["ssh_keys"].items():
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if key2file.has_key(key):
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util.write_file(key2file[key][0],val,key2file[key][1])
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priv2pub = { 'rsa_private':'rsa_public', 'dsa_private':'dsa_public' }
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cmd = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
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for priv,pub in priv2pub.iteritems():
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if pub in cfg['ssh_keys'] or not priv in cfg['ssh_keys']: continue
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pair=(key2file[priv][0], key2file[pub][0])
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subprocess.call(('sh', '-xc', cmd % pair))
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log.debug("generated %s from %s" % pair)
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else:
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# if not, generate them
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genkeys ='ssh-keygen -f /etc/ssh/ssh_host_rsa_key -t rsa -N ""; '
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genkeys+='ssh-keygen -f /etc/ssh/ssh_host_dsa_key -t dsa -N ""; '
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subprocess.call(('sh', '-c', "{ %s } </dev/null" % (genkeys)))
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try:
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user = util.get_cfg_option_str(cfg,'user')
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disable_root = util.get_cfg_option_bool(cfg, "disable_root", True)
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keys = cloud.get_public_ssh_keys()
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if cfg.has_key("ssh_authorized_keys"):
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cfgkeys = cfg["ssh_authorized_keys"]
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keys.extend(cfgkeys)
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apply_credentials(keys,user,disable_root)
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except:
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log.warn("applying credentials failed!\n")
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send_ssh_keys_to_console()
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def send_ssh_keys_to_console():
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subprocess.call(('/usr/lib/cloud-init/write-ssh-key-fingerprints',))
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def apply_credentials(keys, user, disable_root):
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keys = set(keys)
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if user:
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setup_user_keys(keys, user, '')
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if disable_root:
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key_prefix = 'command="echo \'Please login as the user \\\"%s\\\" rather than the user \\\"root\\\".\';echo;sleep 10" ' % user
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else:
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key_prefix = ''
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setup_user_keys(keys, 'root', key_prefix)
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def setup_user_keys(keys, user, key_prefix):
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import pwd
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saved_umask = os.umask(077)
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pwent = pwd.getpwnam(user)
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ssh_dir = '%s/.ssh' % pwent.pw_dir
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if not os.path.exists(ssh_dir):
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os.mkdir(ssh_dir)
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os.chown(ssh_dir, pwent.pw_uid, pwent.pw_gid)
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authorized_keys = '%s/.ssh/authorized_keys' % pwent.pw_dir
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fp = open(authorized_keys, 'a')
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fp.write(''.join(['%s%s\n' % (key_prefix, key) for key in keys]))
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fp.close()
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os.chown(authorized_keys, pwent.pw_uid, pwent.pw_gid)
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os.umask(saved_umask)
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