services/vpn/handler.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 from pymin.seqtools import Sequence
  10 from pymin.dispatcher import Handler, handler, HandlerError
  11 from pymin.service.util import Restorable, ConfigWriter, InitdHandler, \
  12                                TransactionalHandler, DictSubHandler, DictComposedSubHandler, call, ExecutionError
  13
  14 __all__ = ('VpnHandler', 'get_service')
  15
  16
  17 def get_service(config):
  18     return VpnHandler(config.vpn.pickle_dir, config.vpn.config_dir)
  19
  20
  21 class Host(Sequence):
  22     def __init__(self, vpn_src, ip, vpn_src_net, key):
  23         self.name = vpn_src
  24         self.ip = ip
  25         self.src_net = vpn_src_net
  26         self.pub_key = key
  27         self._delete = False
  28
  29     def as_tuple(self):
  30         return(self.name, self.ip, self.src_net, self.pub_key)
  31
  32 class HostHandler(DictComposedSubHandler):
  33
  34     handler_help = u"Manage hosts for a vpn"
  35     _comp_subhandler_cont = 'vpns'
  36     _comp_subhandler_attr = 'hosts'
  37     _comp_subhandler_class = Host
  38
  39
  40 class Vpn(Sequence):
  41     def __init__(self, vpn_src, vpn_dst, vpn_src_ip, vpn_src_mask,
  42                     pub_key=None, priv_key=None):
  43         self.vpn_src = vpn_src
  44         self.vpn_dst = vpn_dst
  45         self.vpn_src_ip = vpn_src_ip
  46         self.vpn_src_mask = vpn_src_mask
  47         self.pub_key = pub_key
  48         self.priv_key = priv_key
  49         self.hosts = dict()
  50         self._delete = False
  51
  52     def as_tuple(self):
  53         return(self.vpn_src, self.vpn_dst, self.vpn_src_ip, self.vpn_src_mask, self.pub_key, self.priv_key)
  54
  55     def update(self, vpn_dst=None, vpn_src_ip=None, vpn_src_mask=None):
  56         if vpn_dst is not None:
  57             self.vpn_dst = vpn_dst
  58         if vpn_src_ip is not None:
  59             self.vpn_src_ip = vpn_src_ip
  60         if vpn_src_mask is not None:
  61             self.vpn_src_mask = vpn_src_mask
  62
  63
  64 class VpnHandler(Restorable, ConfigWriter,
  65                    TransactionalHandler, DictSubHandler):
  66
  67     handler_help = u"Manage vpn service"
  68
  69     _cont_subhandler_attr = 'vpns'
  70     _cont_subhandler_class = Vpn
  71
  72     _persistent_attrs = ('vpns','hosts')
  73
  74     _restorable_defaults = dict(
  75             vpns = dict(),
  76             hosts = dict(),
  77     )
  78
  79     _config_writer_files = ('tinc.conf','tinc-up','host')
  80     _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
  81
  82     def __init__(self,  pickle_dir='.', config_dir='/etc/tinc'):
  83         log.debug(u'VpnHandler(%r, %r)', pickle_dir, config_dir)
  84         DictSubHandler.__init__(self, self)
  85         self._config_writer_cfg_dir = config_dir
  86         self._persistent_dir = pickle_dir
  87         self._config_build_templates()
  88         self._restore()
  89         self.host = HostHandler(self)
  90
  91     @handler('usage: start <vpn_name>')
  92     def start(self, vpn_src):
  93         log.debug(u'VpnHandler.start(%r)', vpn_src)
  94         if vpn_src in self.vpns:
  95             call(('tincd','--net='+ vpn_src))
  96
  97     @handler('usage: stop <vpn_name>')
  98     def stop(self, vpn_src):
  99         log.debug(u'VpnHandler.stop(%r)', vpn_src)
 100         if vpn_src in self.vpns:
 101             pid_file = '/var/run/tinc.' + vpn_src + '.pid'
 102             log.debug(u'VpnHandler.stop: getting pid from %r', pid_file)
 103             if path.exists(pid_file):
 104                 pid = file(pid_file).readline()
 105                 pid = int(pid.strip())
 106                 try:
 107                     log.debug(u'VpnHandler.stop: killing pid %r', pid)
 108                     os.kill(pid, signal.SIGTERM)
 109                 except OSError:
 110                     log.debug(u'VpnHandler.stop: error killing: %r', e)
 111             else:
 112                 log.debug(u'VpnHandler.stop: pid file not found')
 113
 114     def _write_config(self):
 115         log.debug(u'VpnHandler._write_config()')
 116         for v in self.vpns.values():
 117             log.debug(u'VpnHandler._write_config: processing %r', v)
 118             #chek whether it's been created or not.
 119             if not v._delete:
 120                 if v.pub_key is None:
 121                     log.debug(u'VpnHandler._write_config: new VPN, generating '
 122                                 'key...')
 123                     try:
 124                         log.debug(u'VpnHandler._write_config: creating dir %r',
 125                                     path.join(self._config_writer_cfg_dir,
 126                                                 v.vpn_src ,'hosts'))
 127                         #first create the directory for the vpn
 128                         try:
 129                             os.makedirs(path.join(self._config_writer_cfg_dir,
 130                                                   v.vpn_src, 'hosts'))
 131                         except (IOError, OSError), e:
 132                             if e.errno != errno.EEXIST:
 133                                 raise HandlerError(u"Can't create VPN config "
 134                                                    "directory '%s' (%s)'"
 135                                                     % (e.filename, e.strerror))
 136                         #this command should generate 2 files inside the vpn
 137                         #dir, one rsa_key.priv and one rsa_key.pub
 138                         #for some reason debian does not work like this
 139                         # FIXME if the < /dev/null works, is magic!
 140                         log.debug(u'VpnHandler._write_config: creating key...')
 141                         call(('tincd', '-n', v.vpn_src, '-K', '<', '/dev/null'))
 142                         #open the created files and load the keys
 143                         try:
 144                             f = file(path.join(self._config_writer_cfg_dir,
 145                                                v.vpn_src, 'rsa_key.pub'),
 146                                      'r')
 147                             pub = f.read()
 148                             f.close()
 149                         except (IOError, OSError), e:
 150                             raise HandlerError(u"Can't read VPN key '%s' (%s)'"
 151                                                 % (e.filename, e.strerror))
 152
 153                         v.pub_key = pub
 154                         v.priv_key = priv
 155                     except ExecutionError, e:
 156                         log.debug(u'VpnHandler._write_config: error executing '
 157                                     'the command: %r', e)
 158
 159                 vars = dict(
 160                     vpn = v,
 161                 )
 162                 self._write_single_config('tinc.conf',
 163                                 path.join(v.vpn_src, 'tinc.conf'), vars)
 164                 self._write_single_config('tinc-up',
 165                                 path.join(v.vpn_src, 'tinc-up'), vars)
 166                 for h in v.hosts.values():
 167                     if not h._delete:
 168                         vars = dict(
 169                             host = h,
 170                         )
 171                         self._write_single_config('host',
 172                                 path.join(v.vpn_src, 'hosts', h.name), vars)
 173                     else:
 174                         log.debug(u'VpnHandler._write_config: removing...')
 175                         try:
 176                             # FIXME use os.unlink()
 177                             call(('rm','-f',
 178                                     path.join(v.vpn_src, 'hosts', h.name)))
 179                             del v.hosts[h.name]
 180                         except ExecutionError, e:
 181                             log.debug(u'VpnHandler._write_config: error '
 182                                     'removing files: %r', e)
 183             else:
 184                 #delete the vpn root at tinc dir
 185                 if path.exists('/etc/tinc/' + v.vpn_src):
 186                     self.stop(v.vpn_src)
 187                     call(('rm','-rf','/etc/tinc/' + v.vpn_src))
 188                     del self.vpns[v.vpn_src]
 189
 190
 191 if __name__ == '__main__':
 192
 193     logging.basicConfig(
 194         level   = logging.DEBUG,
 195         format  = '%(asctime)s %(levelname)-8s %(message)s',
 196         datefmt = '%H:%M:%S',
 197     )
 198
 199     v = VpnHandler()
 200     v.add('prueba','sarasa','192.168.0.188','255.255.255.0')
 201     v.host.add('prueba', 'azazel' ,'192.168.0.77', '192.168.0.0',
 202                 'kjdhfkbdskljvkjblkbjeslkjbvkljbselvslberjhbvslbevlhb')
 203     v.commit()
 204