diff options
Diffstat (limited to 'src/leap/eip/openvpnconnection.py')
| -rw-r--r-- | src/leap/eip/openvpnconnection.py | 472 |
1 files changed, 203 insertions, 269 deletions
diff --git a/src/leap/eip/openvpnconnection.py b/src/leap/eip/openvpnconnection.py index 07bc628a..253f5056 100644 --- a/src/leap/eip/openvpnconnection.py +++ b/src/leap/eip/openvpnconnection.py @@ -7,7 +7,6 @@ import os import psutil import shutil import socket -import time from functools import partial logger = logging.getLogger(name=__name__) @@ -20,12 +19,123 @@ from leap.eip import config as eip_config from leap.eip import exceptions as eip_exceptions -class OpenVPNConnection(Connection): +class OpenVPNManagement(object): + + # TODO explain a little bit how management interface works + # and our telnet interface with support for unix sockets. + + """ + for more information, read openvpn management notes. + zcat `dpkg -L openvpn | grep management` + """ + + def _connect_to_management(self): + """ + Connect to openvpn management interface + """ + if hasattr(self, 'tn'): + self._close_management_socket() + self.tn = UDSTelnet(self.host, self.port) + + # XXX make password optional + # specially for win. we should generate + # the pass on the fly when invoking manager + # from conductor + + #self.tn.read_until('ENTER PASSWORD:', 2) + #self.tn.write(self.password + '\n') + #self.tn.read_until('SUCCESS:', 2) + if self.tn: + self._seek_to_eof() + return True + + def _close_management_socket(self, announce=True): + """ + Close connection to openvpn management interface + """ + logger.debug('closing socket') + if announce: + self.tn.write("quit\n") + self.tn.read_all() + self.tn.get_socket().close() + del self.tn + + def _seek_to_eof(self): + """ + Read as much as available. Position seek pointer to end of stream + """ + try: + b = self.tn.read_eager() + except EOFError: + logger.debug("Could not read from socket. Assuming it died.") + return + while b: + try: + b = self.tn.read_eager() + except EOFError: + logger.debug("Could not read from socket. Assuming it died.") + + def _send_command(self, cmd): + """ + Send a command to openvpn and return response as list + """ + if not self.connected(): + try: + self._connect_to_management() + except eip_exceptions.MissingSocketError: + logger.warning('missing management socket') + return [] + try: + if hasattr(self, 'tn'): + self.tn.write(cmd + "\n") + except socket.error: + logger.error('socket error') + self._close_management_socket(announce=False) + return [] + buf = self.tn.read_until(b"END", 2) + self._seek_to_eof() + blist = buf.split('\r\n') + if blist[-1].startswith('END'): + del blist[-1] + return blist + else: + return [] + + def _send_short_command(self, cmd): + """ + parse output from commands that are + delimited by "success" instead + """ + if not self.connected(): + self.connect() + self.tn.write(cmd + "\n") + # XXX not working? + buf = self.tn.read_until(b"SUCCESS", 2) + self._seek_to_eof() + blist = buf.split('\r\n') + return blist + + # + # random maybe useful vpn commands + # + + def pid(self): + #XXX broken + return self._send_short_command("pid") + + +class OpenVPNConnection(Connection, OpenVPNManagement): """ All related to invocation - of the openvpn binary + of the openvpn binary. + It's extended by EIPConnection. """ + # XXX Inheriting from Connection was an early design idea + # but currently that's an empty class. + # We can get rid of that if we don't use it for sharing + # state with other leap modules. + def __init__(self, watcher_cb=None, debug=False, @@ -34,24 +144,21 @@ class OpenVPNConnection(Connection): password=None, *args, **kwargs): """ - :param config_file: configuration file to read from :param watcher_cb: callback to be \ called for each line in watched stdout :param signal_map: dictionary of signal names and callables \ to be triggered for each one of them. - :type config_file: str :type watcher_cb: function :type signal_map: dict """ #XXX FIXME #change watcher_cb to line_observer + # XXX if not host: raise ImproperlyConfigured logger.debug('init openvpn connection') self.debug = debug - # XXX if not host: raise ImproperlyConfigured self.ovpn_verbosity = kwargs.get('ovpn_verbosity', None) - #self.config_file = config_file self.watcher_cb = watcher_cb #self.signal_maps = signal_maps @@ -62,21 +169,13 @@ to be triggered for each one of them. self.port = None self.proto = None - #XXX workaround for signaling - #the ui that we don't know how to - #manage a connection error - #self.with_errors = False - self.command = None self.args = None # XXX get autostart from config self.autostart = True - # - # management init methods - # - + # management interface init self.host = host if isinstance(port, str) and port.isdigit(): port = int(port) @@ -88,101 +187,47 @@ to be triggered for each one of them. self.password = password def run_openvpn_checks(self): + """ + runs check needed before launching + openvpn subprocess. will raise if errors found. + """ logger.debug('running openvpn checks') + # XXX I think that "check_if_running" should be called + # from try openvpn connection instead. -- kali. + # let's prepare tests for that before changing it... self._check_if_running_instance() self._set_ovpn_command() self._check_vpn_keys() - def _set_ovpn_command(self): - # XXX check also for command-line --command flag - try: - command, args = eip_config.build_ovpn_command( - provider=self.provider, - debug=self.debug, - socket_path=self.host, - ovpn_verbosity=self.ovpn_verbosity) - except eip_exceptions.EIPNoPolkitAuthAgentAvailable: - command = args = None - raise - except eip_exceptions.EIPNoPkexecAvailable: - command = args = None - raise - - # XXX if not command, signal error. - self.command = command - self.args = args - - def _check_vpn_keys(self): - """ - checks for correct permissions on vpn keys - """ - try: - eip_config.check_vpn_keys(provider=self.provider) - except eip_exceptions.EIPInitBadKeyFilePermError: - logger.error('Bad VPN Keys permission!') - # do nothing now - # and raise the rest ... - - def _launch_openvpn(self): - """ - invocation of openvpn binaries in a subprocess. - """ - #XXX TODO: - #deprecate watcher_cb, - #use _only_ signal_maps instead - - logger.debug('_launch_openvpn called') - if self.watcher_cb is not None: - linewrite_callback = self.watcher_cb - else: - #XXX get logger instead - linewrite_callback = lambda line: print('watcher: %s' % line) - - # the partial is not - # being applied now because we're not observing the process - # stdout like we did in the early stages. but I leave it - # here since it will be handy for observing patterns in the - # thru-the-manager updates (with regex) - observers = (linewrite_callback, - partial(lambda con_status, line: None, self.status)) - subp, watcher = spawn_and_watch_process( - self.command, - self.args, - observers=observers) - self.subp = subp - self.watcher = watcher - - def _try_connection(self): + def try_openvpn_connection(self): """ attempts to connect """ + # XXX should make public method if self.command is None: raise eip_exceptions.EIPNoCommandError if self.subp is not None: logger.debug('cowardly refusing to launch subprocess again') + # XXX this is not returning ???!! + # FIXME -- so it's calling it all the same!! self._launch_openvpn() - def _check_if_running_instance(self): + def connected(self): """ - check if openvpn is already running + Returns True if connected + rtype: bool """ - for process in psutil.get_process_list(): - if process.name == "openvpn": - logger.debug('an openvpn instance is already running.') - logger.debug('attempting to stop openvpn instance.') - if not self._stop(): - raise eip_exceptions.OpenVPNAlreadyRunning - - logger.debug('no openvpn instance found.') + # XXX make a property + return hasattr(self, 'tn') - def cleanup(self, shutdown=False): + def terminate_openvpn_connection(self, shutdown=False): """ terminates openvpn child subprocess """ if self.subp: try: - self._stop() + self._stop_openvpn() except eip_exceptions.ConnectionRefusedError: logger.warning( 'unable to send sigterm signal to openvpn: ' @@ -202,9 +247,9 @@ to be triggered for each one of them. '(We might have left openvpn running)' % RETCODE) if shutdown: - self.cleanup_tempfiles() + self._cleanup_tempfiles() - def cleanup_tempfiles(self): + def _cleanup_tempfiles(self): """ remove all temporal files we might have left behind @@ -224,172 +269,89 @@ to be triggered for each one of them. except OSError: logger.error('could not delete tmpfolder %s' % tempfolder) - def _get_openvpn_process(self): - # plist = [p for p in psutil.get_process_list() if p.name == "openvpn"] - # return plist[0] if plist else None + # checks + + def _check_if_running_instance(self): + """ + check if openvpn is already running + """ for process in psutil.get_process_list(): if process.name == "openvpn": - return process - return None - - # management methods - # - # XXX REVIEW-ME - # REFACTOR INFO: (former "manager". - # Can we move to another - # base class to test independently?) - # - - #def forget_errors(self): - #logger.debug('forgetting errors') - #self.with_errors = False - - def connect_to_management(self): - """Connect to openvpn management interface""" - #logger.debug('connecting socket') - if hasattr(self, 'tn'): - self.close() - self.tn = UDSTelnet(self.host, self.port) - - # XXX make password optional - # specially for win. we should generate - # the pass on the fly when invoking manager - # from conductor + logger.debug('an openvpn instance is already running.') + logger.debug('attempting to stop openvpn instance.') + if not self._stop_openvpn(): + raise eip_exceptions.OpenVPNAlreadyRunning - #self.tn.read_until('ENTER PASSWORD:', 2) - #self.tn.write(self.password + '\n') - #self.tn.read_until('SUCCESS:', 2) - if self.tn: - self._seek_to_eof() - return True + logger.debug('no openvpn instance found.') - def _seek_to_eof(self): - """ - Read as much as available. Position seek pointer to end of stream - """ + def _set_ovpn_command(self): try: - b = self.tn.read_eager() - except EOFError: - logger.debug("Could not read from socket. Assuming it died.") - return - while b: - try: - b = self.tn.read_eager() - except EOFError: - logger.debug("Could not read from socket. Assuming it died.") - - def connected(self): - """ - Returns True if connected - rtype: bool - """ - return hasattr(self, 'tn') + command, args = eip_config.build_ovpn_command( + provider=self.provider, + debug=self.debug, + socket_path=self.host, + ovpn_verbosity=self.ovpn_verbosity) + except eip_exceptions.EIPNoPolkitAuthAgentAvailable: + command = args = None + raise + except eip_exceptions.EIPNoPkexecAvailable: + command = args = None + raise - def close(self, announce=True): - """ - Close connection to openvpn management interface - """ - logger.debug('closing socket') - if announce: - self.tn.write("quit\n") - self.tn.read_all() - self.tn.get_socket().close() - del self.tn + # XXX if not command, signal error. + self.command = command + self.args = args - def _send_command(self, cmd): + def _check_vpn_keys(self): """ - Send a command to openvpn and return response as list + checks for correct permissions on vpn keys """ - if not self.connected(): - try: - self.connect_to_management() - except eip_exceptions.MissingSocketError: - logger.warning('missing management socket') - return [] try: - if hasattr(self, 'tn'): - self.tn.write(cmd + "\n") - except socket.error: - logger.error('socket error') - self.close(announce=False) - return [] - buf = self.tn.read_until(b"END", 2) - self._seek_to_eof() - blist = buf.split('\r\n') - if blist[-1].startswith('END'): - del blist[-1] - return blist - else: - return [] - - def _send_short_command(self, cmd): - """ - parse output from commands that are - delimited by "success" instead - """ - if not self.connected(): - self.connect() - self.tn.write(cmd + "\n") - # XXX not working? - buf = self.tn.read_until(b"SUCCESS", 2) - self._seek_to_eof() - blist = buf.split('\r\n') - return blist - - # - # useful vpn commands - # - - def pid(self): - #XXX broken - return self._send_short_command("pid") + eip_config.check_vpn_keys(provider=self.provider) + except eip_exceptions.EIPInitBadKeyFilePermError: + logger.error('Bad VPN Keys permission!') + # do nothing now + # and raise the rest ... - def make_error(self): - """ - capture error and wrap it in an - understandable format - """ - #XXX get helpful error codes - self.with_errors = True - now = int(time.time()) - return '%s,LAUNCHER ERROR,ERROR,-,-' % now + # starting and stopping openvpn subprocess - def state(self): + def _launch_openvpn(self): """ - OpenVPN command: state + invocation of openvpn binaries in a subprocess. """ - state = self._send_command("state") - if not state: - return None - if isinstance(state, str): - return state - if isinstance(state, list): - if len(state) == 1: - return state[0] - else: - return state[-1] + #XXX TODO: + #deprecate watcher_cb, + #use _only_ signal_maps instead - def vpn_status(self): - """ - OpenVPN command: status - """ - #logger.debug('status called') - status = self._send_command("status") - return status + logger.debug('_launch_openvpn called') + if self.watcher_cb is not None: + linewrite_callback = self.watcher_cb + else: + #XXX get logger instead + linewrite_callback = lambda line: print('watcher: %s' % line) - def vpn_status2(self): - """ - OpenVPN command: last 2 statuses - """ - return self._send_command("status 2") + # the partial is not + # being applied now because we're not observing the process + # stdout like we did in the early stages. but I leave it + # here since it will be handy for observing patterns in the + # thru-the-manager updates (with regex) + observers = (linewrite_callback, + partial(lambda con_status, line: None, self.status)) + subp, watcher = spawn_and_watch_process( + self.command, + self.args, + observers=observers) + self.subp = subp + self.watcher = watcher - def _stop(self): + def _stop_openvpn(self): """ stop openvpn process by sending SIGTERM to the management interface """ - logger.debug("disconnecting...") + # XXX method a bit too long, split + logger.debug("terminating openvpn process...") if self.connected(): try: self._send_command("signal SIGTERM\n") @@ -424,38 +386,10 @@ to be triggered for each one of them. return True - # - # parse info - # - - def get_status_io(self): - status = self.vpn_status() - if isinstance(status, str): - lines = status.split('\n') - if isinstance(status, list): - lines = status - try: - (header, when, tun_read, tun_write, - tcp_read, tcp_write, auth_read) = tuple(lines) - except ValueError: - return None - - when_ts = time.strptime(when.split(',')[1], "%a %b %d %H:%M:%S %Y") - sep = ',' - # XXX cleanup! - tun_read = tun_read.split(sep)[1] - tun_write = tun_write.split(sep)[1] - tcp_read = tcp_read.split(sep)[1] - tcp_write = tcp_write.split(sep)[1] - auth_read = auth_read.split(sep)[1] - - # XXX this could be a named tuple. prettier. - return when_ts, (tun_read, tun_write, tcp_read, tcp_write, auth_read) - - def get_connection_state(self): - state = self.state() - if state is not None: - ts, status_step, ok, ip, remote = state.split(',') - ts = time.gmtime(float(ts)) - # XXX this could be a named tuple. prettier. - return ts, status_step, ok, ip, remote + def _get_openvpn_process(self): + # plist = [p for p in psutil.get_process_list() if p.name == "openvpn"] + # return plist[0] if plist else None + for process in psutil.get_process_list(): + if process.name == "openvpn": + return process + return None |