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