dropbear.py
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##############################################################################
#
# Copyright (c) 2010 Vifib SARL and Contributors. All Rights Reserved.
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program is Free Software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
##############################################################################
import errno, os
from slapos.recipe.librecipe import GenericBaseRecipe
class KnownHostsFile(dict):
def __init__(self, filename):
self._filename = filename
def _load(self):
if os.path.exists(self._filename):
with open(self._filename, 'r') as keyfile:
for line in keyfile:
if line.strip() == "":
continue
host, key = [column.strip() for column in line.split(' ', 1)]
self[host] = key
def _dump(self):
with open(self._filename, 'w') as keyfile:
for key, value in self.items():
if key is not None and value is not None:
keyfile.write('%(host)s %(key)s\n' % {'host': key,
'key': value})
def __enter__(self):
self._load()
def __exit__(self, exc_type, exc_value, traceback):
self._dump()
class Recipe(GenericBaseRecipe):
def install(self):
dropbear_cmd = [self.options['dropbear-binary']]
# Don't fork into background
dropbear_cmd.append('-F')
# Log on stderr
dropbear_cmd.append('-E')
# Don't display motd
dropbear_cmd.append('-m')
# Disable password login
dropbear_cmd.extend(['-s', '-g'])
# Disable port forwarding
if not self.optionIsTrue('allow-port-forwarding', default=False):
dropbear_cmd.extend(['-j', '-k'])
host = self.options['host']
if ':' in host:
host = '[%s]' % host
port = self.options['port']
binding_address = '%s:%s' % (host, port)
dropbear_cmd.extend(['-p', binding_address])
# Single user mode
dropbear_cmd.append('-n')
# Keep connection alive for 5 minutes
dropbear_cmd.extend(['-K', '300'])
if 'dss-keyfile' in self.options:
dropbear_cmd.extend(['-d', self.options['dss-keyfile']])
else:
dropbear_cmd.extend(['-r', self.options['rsa-keyfile']])
env = {}
if 'home' in self.options:
env['DROPBEAR_OVERRIDE_HOME'] = self.options['home']
if 'shell' in self.options:
env['DROPBEAR_OVERRIDE_SHELL'] = self.options['shell']
return self.createWrapper(self.options['wrapper'], dropbear_cmd, env)
class Client(GenericBaseRecipe):
def install(self):
env = {}
if 'home' in self.options:
env['HOME'] = self.options['home']
self.createDirectory(self.options['home'], '.ssh')
dropbear_cmd = [self.options['dbclient-binary'], '-T']
if self.optionIsTrue('force-host-key', default=False):
dropbear_cmd.extend(['-y'])
if 'identity-file' in self.options:
dropbear_cmd.extend(['-i', self.options['identity-file']])
return self.createWrapper(self.options['wrapper'], dropbear_cmd, env)
class AddAuthorizedKey(GenericBaseRecipe):
def install(self):
key = self.options['key']
ssh = self.createDirectory(self.options['home'], '.ssh')
filename = os.path.join(ssh, 'authorized_keys')
try:
with open(filename) as f:
if f.read() == key:
return [filename]
except IOError as e:
if e.errno != errno.ENOENT:
raise
# Atomic update.
tmp = filename + '.new'
try:
with open(tmp, 'w') as f:
f.write(key)
os.rename(tmp, filename)
finally:
try:
os.remove(tmp)
except OSError as e:
if e.errno != errno.ENOENT:
raise
return [filename]