pymin/services/vpn/__init__.py

   1 # vim: set encoding=utf-8 et sw=4 sts=4 :
   2
   3 import os
   4 import errno
   5 import signal
   6 from os import path
   7 import logging ; log = logging.getLogger('pymin.services.vpn')
   8
   9
  10 from pymin.seqtools import Sequence
  11 from pymin.dispatcher import Handler, handler, HandlerError
  12 from pymin.services.util import Restorable, ConfigWriter, InitdHandler, \
  13                                 TransactionalHandler, DictSubHandler, DictComposedSubHandler, call, ExecutionError
  14
  15
  16 class Host(Sequence):
  17     def __init__(self, vpn_src, ip, vpn_src_net, key):
  18         self.name = vpn_src
  19         self.ip = ip
  20         self.src_net = vpn_src_net
  21         self.pub_key = key
  22         self._delete = False
  23
  24     def as_tuple(self):
  25         return(self.name, self.ip, self.src_net, self.pub_key)
  26
  27 class HostHandler(DictComposedSubHandler):
  28
  29     handler_help = u"Manage hosts for a vpn"
  30     _comp_subhandler_cont = 'vpns'
  31     _comp_subhandler_attr = 'hosts'
  32     _comp_subhandler_class = Host
  33
  34
  35 class Vpn(Sequence):
  36     def __init__(self, vpn_src, vpn_dst, vpn_src_ip, vpn_src_mask,
  37                     pub_key=None, priv_key=None):
  38         self.vpn_src = vpn_src
  39         self.vpn_dst = vpn_dst
  40         self.vpn_src_ip = vpn_src_ip
  41         self.vpn_src_mask = vpn_src_mask
  42         self.pub_key = pub_key
  43         self.priv_key = priv_key
  44         self.hosts = dict()
  45         self._delete = False
  46
  47     def as_tuple(self):
  48         return(self.vpn_src, self.vpn_dst, self.vpn_src_ip, self.vpn_src_mask, self.pub_key, self.priv_key)
  49
  50     def update(self, vpn_dst=None, vpn_src_ip=None, vpn_src_mask=None):
  51         if vpn_dst is not None:
  52             self.vpn_dst = vpn_dst
  53         if vpn_src_ip is not None:
  54             self.vpn_src_ip = vpn_src_ip
  55         if vpn_src_mask is not None:
  56             self.vpn_src_mask = vpn_src_mask
  57
  58
  59 class VpnHandler(Restorable, ConfigWriter,
  60                    TransactionalHandler, DictSubHandler):
  61
  62     handler_help = u"Manage vpn service"
  63
  64     _cont_subhandler_attr = 'vpns'
  65     _cont_subhandler_class = Vpn
  66
  67     _persistent_attrs = ('vpns','hosts')
  68
  69     _restorable_defaults = dict(
  70             vpns = dict(),
  71             hosts = dict(),
  72     )
  73
  74     _config_writer_files = ('tinc.conf','tinc-up','host')
  75     _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
  76
  77     def __init__(self,  pickle_dir='.', config_dir='/etc/tinc'):
  78         log.debug(u'VpnHandler(%r, %r)', pickle_dir, config_dir)
  79         DictSubHandler.__init__(self, self)
  80         self._config_writer_cfg_dir = config_dir
  81         self._persistent_dir = pickle_dir
  82         self._config_build_templates()
  83         self._restore()
  84         self.host = HostHandler(self)
  85
  86     @handler('usage: start <vpn_name>')
  87     def start(self, vpn_src):
  88         log.debug(u'VpnHandler.start(%r)', vpn_src)
  89         if vpn_src in self.vpns:
  90             call(('tincd','--net='+ vpn_src))
  91
  92     @handler('usage: stop <vpn_name>')
  93     def stop(self, vpn_src):
  94         log.debug(u'VpnHandler.stop(%r)', vpn_src)
  95         if vpn_src in self.vpns:
  96             pid_file = '/var/run/tinc.' + vpn_src + '.pid'
  97             log.debug(u'VpnHandler.stop: getting pid from %r', pid_file)
  98             if path.exists(pid_file):
  99                 pid = file(pid_file).readline()
 100                 pid = int(pid.strip())
 101                 try:
 102                     log.debug(u'VpnHandler.stop: killing pid %r', pid)
 103                     os.kill(pid, signal.SIGTERM)
 104                 except OSError:
 105                     log.debug(u'VpnHandler.stop: error killing: %r', e)
 106             else:
 107                 log.debug(u'VpnHandler.stop: pid file not found')
 108
 109     def _write_config(self):
 110         log.debug(u'VpnHandler._write_config()')
 111         for v in self.vpns.values():
 112             log.debug(u'VpnHandler._write_config: processing %r', v)
 113             #chek whether it's been created or not.
 114             if not v._delete:
 115                 if v.pub_key is None:
 116                     log.debug(u'VpnHandler._write_config: new VPN, generating '
 117                                 'key...')
 118                     try:
 119                         log.debug(u'VpnHandler._write_config: creating dir %r',
 120                                     path.join(self._config_writer_cfg_dir,
 121                                                 v.vpn_src ,'hosts'))
 122                         #first create the directory for the vpn
 123                         try:
 124                             os.makedirs(path.join(self._config_writer_cfg_dir,
 125                                                   v.vpn_src, 'hosts'))
 126                         except (IOError, OSError), e:
 127                             if e.errno != errno.EEXIST:
 128                                 raise HandlerError(u"Can't create VPN config "
 129                                                    "directory '%s' (%s)'"
 130                                                     % (e.filename, e.strerror))
 131                         #this command should generate 2 files inside the vpn
 132                         #dir, one rsa_key.priv and one rsa_key.pub
 133                         #for some reason debian does not work like this
 134                         # FIXME if the < /dev/null works, is magic!
 135                         log.debug(u'VpnHandler._write_config: creating key...')
 136                         call(('tincd', '-n', v.vpn_src, '-K', '<', '/dev/null'))
 137                         #open the created files and load the keys
 138                         try:
 139                             f = file(path.join(self._config_writer_cfg_dir,
 140                                                v.vpn_src, 'rsa_key.pub'),
 141                                      'r')
 142                             pub = f.read()
 143                             f.close()
 144                         except (IOError, OSError), e:
 145                             raise HandlerError(u"Can't read VPN key '%s' (%s)'"
 146                                                 % (e.filename, e.strerror))
 147
 148                         v.pub_key = pub
 149                         v.priv_key = priv
 150                     except ExecutionError, e:
 151                         log.debug(u'VpnHandler._write_config: error executing '
 152                                     'the command: %r', e)
 153
 154                 vars = dict(
 155                     vpn = v,
 156                 )
 157                 self._write_single_config('tinc.conf',
 158                                 path.join(v.vpn_src, 'tinc.conf'), vars)
 159                 self._write_single_config('tinc-up',
 160                                 path.join(v.vpn_src, 'tinc-up'), vars)
 161                 for h in v.hosts.values():
 162                     if not h._delete:
 163                         vars = dict(
 164                             host = h,
 165                         )
 166                         self._write_single_config('host',
 167                                 path.join(v.vpn_src, 'hosts', h.name), vars)
 168                     else:
 169                         log.debug(u'VpnHandler._write_config: removing...')
 170                         try:
 171                             # FIXME use os.unlink()
 172                             call(('rm','-f',
 173                                     path.join(v.vpn_src, 'hosts', h.name)))
 174                             del v.hosts[h.name]
 175                         except ExecutionError, e:
 176                             log.debug(u'VpnHandler._write_config: error '
 177                                     'removing files: %r', e)
 178             else:
 179                 #delete the vpn root at tinc dir
 180                 if path.exists('/etc/tinc/' + v.vpn_src):
 181                     self.stop(v.vpn_src)
 182                     call(('rm','-rf','/etc/tinc/' + v.vpn_src))
 183                     del self.vpns[v.vpn_src]
 184
 185
 186 if __name__ == '__main__':
 187
 188     logging.basicConfig(
 189         level   = logging.DEBUG,
 190         format  = '%(asctime)s %(levelname)-8s %(message)s',
 191         datefmt = '%H:%M:%S',
 192     )
 193
 194     v = VpnHandler()
 195     v.add('prueba','sarasa','192.168.0.188','255.255.255.0')
 196     v.host.add('prueba', 'azazel' ,'192.168.0.77', '192.168.0.0',
 197                 'kjdhfkbdskljvkjblkbjeslkjbvkljbselvslberjhbvslbevlhb')
 198     v.commit()
 199