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Diffstat (limited to 'cloudinit/config/ssh.py')
| -rw-r--r-- | cloudinit/config/ssh.py | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/cloudinit/config/ssh.py b/cloudinit/config/ssh.py new file mode 100644 index 00000000..e5e99560 --- /dev/null +++ b/cloudinit/config/ssh.py @@ -0,0 +1,131 @@ +# 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) |