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.dele = 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     @handler('usage: add <vpn_src> <ip> <vpn_src_net> <key>')
  35     def delete(self, vpn_src, host):
  36         DictComposedSubHandler.delete(self, vpn_src, host)
  37         if vpn_src in parent.vpns:
  38             if host in parent.vpns[vpn_src].hosts:
  39                 parent.vpns[vpn_src].hosts[host].dele = True
  40
  41
  42 class Vpn(Sequence):
  43     def __init__(self, vpn_src, vpn_dst, vpn_src_ip, vpn_src_mask, pub_key, priv_key):
  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.dele = 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 : add <vpn_name> <vpn_dst> <vpn_src_ip> <vpn_src_mask>')
  93     def add(self, vpn_src, vpn_dst, vpn_src_ip, vpn_src_mask):
  94         log.debug(u'VpnHandler.add(%r, %r, %r, %r)', vpn_src, vpn_dst,
  95                     vpn_src_ip, vpn_src_mask)
  96         if vpn_src in self.vpns:
  97             if self.vpns[vpn_src].dele:
  98                 log.debug(u'VpnHandler.add: deleted, undeleting')
  99                 self.vpns[vpn_src] = False
 100         else:
 101             DictSubHandler.add(self, vpn_src, vpn_dst, vpn_src_ip,
 102                                 vpn_src_mask, None, None)
 103
 104     @handler('usage : delete <vpn_name>')
 105     def delete(self, vpn_src):
 106         log.debug(u'VpnHandler.delete(%r)', vpn_src)
 107         if vpn_src in self.vpns:
 108             self.vpns[vpn_src].dele = True;
 109
 110
 111     @handler('usage: start <vpn_name>')
 112     def start(self, vpn_src):
 113         log.debug(u'VpnHandler.start(%r)', vpn_src)
 114         if vpn_src in self.vpns:
 115             call(('tincd','--net='+ vpn_src))
 116
 117     @handler('usage: stop <vpn_name>')
 118     def stop(self, vpn_src):
 119         log.debug(u'VpnHandler.stop(%r)', vpn_src)
 120         if vpn_src in self.vpns:
 121             pid_file = '/var/run/tinc.' + vpn_src + '.pid'
 122             log.debug(u'VpnHandler.stop: getting pid from %r', pid_file)
 123             if path.exists(pid_file):
 124                 pid = file(pid_file).readline()
 125                 pid = int(pid.strip())
 126                 try:
 127                     log.debug(u'VpnHandler.stop: killing pid %r', pid)
 128                     os.kill(pid, signal.SIGTERM)
 129                 except OSError:
 130                     log.debug(u'VpnHandler.stop: error killing: %r', e)
 131             else:
 132                 log.debug(u'VpnHandler.stop: pid file not found')
 133
 134     def _write_config(self):
 135         log.debug(u'VpnHandler._write_config()')
 136         for v in self.vpns.values():
 137             log.debug(u'VpnHandler._write_config: processing %r', v)
 138             #chek whether it's been created or not.
 139             if not v.dele:
 140                 if v.pub_key is None:
 141                     log.debug(u'VpnHandler._write_config: new VPN, generating '
 142                                 'key...')
 143                     try:
 144                         log.debug(u'VpnHandler._write_config: creating dir %r',
 145                                     path.join(self._config_writer_cfg_dir,
 146                                                 v.vpn_src ,'hosts'))
 147                         #first create the directory for the vpn
 148                         try:
 149                             os.makedirs(path.join(self._config_writer_cfg_dir,
 150                                                   v.vpn_src, 'hosts'))
 151                         except (IOError, OSError), e:
 152                             if e.errno != errno.EEXIST:
 153                                 raise HandlerError(u"Can't create VPN config "
 154                                                    "directory '%s' (%s)'"
 155                                                     % (e.filename, e.strerror))
 156                         #this command should generate 2 files inside the vpn
 157                         #dir, one rsa_key.priv and one rsa_key.pub
 158                         #for some reason debian does not work like this
 159                         # FIXME if the < /dev/null works, is magic!
 160                         log.debug(u'VpnHandler._write_config: creating key...')
 161                         call(('tincd', '-n', v.vpn_src, '-K', '<', '/dev/null'))
 162                         #open the created files and load the keys
 163                         f = file(path.join(self._config_writer_cfg_dir,
 164                                             v.vpn_src, 'rsa_key.pub'), 'r')
 165                         pub = f.read()
 166                         f.close()
 167                         v.pub_key = pub
 168                         v.priv_key = priv
 169                     except ExecutionError, e:
 170                         log.debug(u'VpnHandler._write_config: error executing '
 171                                     'the command: %r', e)
 172
 173                 vars = dict(
 174                     vpn = v,
 175                 )
 176                 self._write_single_config('tinc.conf',
 177                                 path.join(v.vpn_src, 'tinc.conf'), vars)
 178                 self._write_single_config('tinc-up',
 179                                 path.join(v.vpn_src, 'tinc-up'), vars)
 180                 for h in v.hosts.values():
 181                     if not h.dele:
 182                         vars = dict(
 183                             host = h,
 184                         )
 185                         self._write_single_config('host',
 186                                 path.join(v.vpn_src, 'hosts', h.name), vars)
 187                     else:
 188                         log.debug(u'VpnHandler._write_config: removing...')
 189                         try:
 190                             # FIXME use os.unlink()
 191                             call(('rm','-f',
 192                                     path.join(v.vpn_src, 'hosts', h.name)))
 193                             del v.hosts[h.name]
 194                         except ExecutionError, e:
 195                             log.debug(u'VpnHandler._write_config: error '
 196                                     'removing files: %r', e)
 197             else:
 198                 #delete the vpn root at tinc dir
 199                 if path.exists('/etc/tinc/' + v.vpn_src):
 200                     self.stop(v.vpn_src)
 201                     call(('rm','-rf','/etc/tinc/' + v.vpn_src))
 202                     del self.vpns[v.vpn_src]
 203
 204
 205 if __name__ == '__main__':
 206
 207     logging.basicConfig(
 208         level   = logging.DEBUG,
 209         format  = '%(asctime)s %(levelname)-8s %(message)s',
 210         datefmt = '%H:%M:%S',
 211     )
 212
 213     v = VpnHandler()
 214     v.add('prueba','sarasa','192.168.0.188','255.255.255.0')
 215     v.host.add('prueba', 'azazel' ,'192.168.0.77', '192.168.0.0',
 216                 'kjdhfkbdskljvkjblkbjeslkjbvkljbselvslberjhbvslbevlhb')
 217     v.commit()
 218