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
  10 from pymin.seqtools import Sequence
  11 from pymin.dispatcher import Handler, handler, HandlerError
  12 from pymin.service.util import Restorable, ConfigWriter, InitdHandler, \
  13                                TransactionalHandler, DictSubHandler, DictComposedSubHandler, call, ExecutionError
  14
  15 __all__ = ('VpnHandler', 'get_service')
  16
  17
  18 def get_service(config):
  19     return VpnHandler(config.vpn.pickle_dir, config.vpn.config_dir)
  20
  21
  22 class Host(Sequence):
  23     def __init__(self, vpn_src, ip, vpn_src_net, key):
  24         self.name = vpn_src
  25         self.ip = ip
  26         self.src_net = vpn_src_net
  27         self.pub_key = key
  28         self._delete = False
  29
  30     def as_tuple(self):
  31         return(self.name, self.ip, self.src_net, self.pub_key)
  32
  33 class HostHandler(DictComposedSubHandler):
  34
  35     handler_help = u"Manage hosts for a vpn"
  36     _comp_subhandler_cont = 'vpns'
  37     _comp_subhandler_attr = 'hosts'
  38     _comp_subhandler_class = Host
  39
  40
  41 class Vpn(Sequence):
  42     def __init__(self, vpn_src, vpn_dst, vpn_src_ip, vpn_src_mask,
  43                     pub_key=None, priv_key=None):
  44         self.vpn_src = vpn_src
  45         self.vpn_dst = vpn_dst
  46         self.vpn_src_ip = vpn_src_ip
  47         self.vpn_src_mask = vpn_src_mask
  48         self.pub_key = pub_key
  49         self.priv_key = priv_key
  50         self.hosts = dict()
  51         self._delete = False
  52
  53     def as_tuple(self):
  54         return(self.vpn_src, self.vpn_dst, self.vpn_src_ip, self.vpn_src_mask, self.pub_key, self.priv_key)
  55
  56     def update(self, vpn_dst=None, vpn_src_ip=None, vpn_src_mask=None):
  57         if vpn_dst is not None:
  58             self.vpn_dst = vpn_dst
  59         if vpn_src_ip is not None:
  60             self.vpn_src_ip = vpn_src_ip
  61         if vpn_src_mask is not None:
  62             self.vpn_src_mask = vpn_src_mask
  63
  64
  65 class VpnHandler(Restorable, ConfigWriter,
  66                    TransactionalHandler, DictSubHandler):
  67
  68     handler_help = u"Manage vpn service"
  69
  70     _cont_subhandler_attr = 'vpns'
  71     _cont_subhandler_class = Vpn
  72
  73     _persistent_attrs = ('vpns','hosts')
  74
  75     _restorable_defaults = dict(
  76             vpns = dict(),
  77             hosts = dict(),
  78     )
  79
  80     _config_writer_files = ('tinc.conf','tinc-up','host')
  81     _config_writer_tpl_dir = path.join(path.dirname(__file__), 'templates')
  82
  83     def __init__(self,  pickle_dir='.', config_dir='/etc/tinc'):
  84         log.debug(u'VpnHandler(%r, %r)', pickle_dir, config_dir)
  85         DictSubHandler.__init__(self, self)
  86         self._config_writer_cfg_dir = config_dir
  87         self._persistent_dir = pickle_dir
  88         self._config_build_templates()
  89         self._restore()
  90         self.host = HostHandler(self)
  91
  92     @handler('usage: start <vpn_name>')
  93     def start(self, vpn_src):
  94         log.debug(u'VpnHandler.start(%r)', vpn_src)
  95         if vpn_src in self.vpns:
  96             call(('tincd','--net='+ vpn_src))
  97
  98     @handler('usage: stop <vpn_name>')
  99     def stop(self, vpn_src):
 100         log.debug(u'VpnHandler.stop(%r)', vpn_src)
 101         if vpn_src in self.vpns:
 102             pid_file = '/var/run/tinc.' + vpn_src + '.pid'
 103             log.debug(u'VpnHandler.stop: getting pid from %r', pid_file)
 104             if path.exists(pid_file):
 105                 pid = file(pid_file).readline()
 106                 pid = int(pid.strip())
 107                 try:
 108                     log.debug(u'VpnHandler.stop: killing pid %r', pid)
 109                     os.kill(pid, signal.SIGTERM)
 110                 except OSError:
 111                     log.debug(u'VpnHandler.stop: error killing: %r', e)
 112             else:
 113                 log.debug(u'VpnHandler.stop: pid file not found')
 114
 115     def _write_config(self):
 116         log.debug(u'VpnHandler._write_config()')
 117         for v in self.vpns.values():
 118             log.debug(u'VpnHandler._write_config: processing %r', v)
 119             #chek whether it's been created or not.
 120             if not v._delete:
 121                 if v.pub_key is None:
 122                     log.debug(u'VpnHandler._write_config: new VPN, generating '
 123                                 'key...')
 124                     try:
 125                         log.debug(u'VpnHandler._write_config: creating dir %r',
 126                                     path.join(self._config_writer_cfg_dir,
 127                                                 v.vpn_src ,'hosts'))
 128                         #first create the directory for the vpn
 129                         try:
 130                             os.makedirs(path.join(self._config_writer_cfg_dir,
 131                                                   v.vpn_src, 'hosts'))
 132                         except (IOError, OSError), e:
 133                             if e.errno != errno.EEXIST:
 134                                 raise HandlerError(u"Can't create VPN config "
 135                                                    "directory '%s' (%s)'"
 136                                                     % (e.filename, e.strerror))
 137                         #this command should generate 2 files inside the vpn
 138                         #dir, one rsa_key.priv and one rsa_key.pub
 139                         #for some reason debian does not work like this
 140                         # FIXME if the < /dev/null works, is magic!
 141                         log.debug(u'VpnHandler._write_config: creating key...')
 142                         call(('tincd', '-n', v.vpn_src, '-K', '<', '/dev/null'))
 143                         #open the created files and load the keys
 144                         try:
 145                             f = file(path.join(self._config_writer_cfg_dir,
 146                                                v.vpn_src, 'rsa_key.pub'),
 147                                      'r')
 148                             pub = f.read()
 149                             f.close()
 150                         except (IOError, OSError), e:
 151                             raise HandlerError(u"Can't read VPN key '%s' (%s)'"
 152                                                 % (e.filename, e.strerror))
 153
 154                         v.pub_key = pub
 155                         v.priv_key = priv
 156                     except ExecutionError, e:
 157                         log.debug(u'VpnHandler._write_config: error executing '
 158                                     'the command: %r', e)
 159
 160                 vars = dict(
 161                     vpn = v,
 162                 )
 163                 self._write_single_config('tinc.conf',
 164                                 path.join(v.vpn_src, 'tinc.conf'), vars)
 165                 self._write_single_config('tinc-up',
 166                                 path.join(v.vpn_src, 'tinc-up'), vars)
 167                 for h in v.hosts.values():
 168                     if not h._delete:
 169                         vars = dict(
 170                             host = h,
 171                         )
 172                         self._write_single_config('host',
 173                                 path.join(v.vpn_src, 'hosts', h.name), vars)
 174                     else:
 175                         log.debug(u'VpnHandler._write_config: removing...')
 176                         try:
 177                             # FIXME use os.unlink()
 178                             call(('rm','-f',
 179                                     path.join(v.vpn_src, 'hosts', h.name)))
 180                             del v.hosts[h.name]
 181                         except ExecutionError, e:
 182                             log.debug(u'VpnHandler._write_config: error '
 183                                     'removing files: %r', e)
 184             else:
 185                 #delete the vpn root at tinc dir
 186                 if path.exists('/etc/tinc/' + v.vpn_src):
 187                     self.stop(v.vpn_src)
 188                     call(('rm','-rf','/etc/tinc/' + v.vpn_src))
 189                     del self.vpns[v.vpn_src]
 190
 191
 192 if __name__ == '__main__':
 193
 194     logging.basicConfig(
 195         level   = logging.DEBUG,
 196         format  = '%(asctime)s %(levelname)-8s %(message)s',
 197         datefmt = '%H:%M:%S',
 198     )
 199
 200     v = VpnHandler()
 201     v.add('prueba','sarasa','192.168.0.188','255.255.255.0')
 202     v.host.add('prueba', 'azazel' ,'192.168.0.77', '192.168.0.0',
 203                 'kjdhfkbdskljvkjblkbjeslkjbvkljbselvslberjhbvslbevlhb')
 204     v.commit()
 205