def _connect_management(self, socket_host, socket_port):
"""
Connects to the management interface on the specified
socket_host socket_port.
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix
socket, or port otherwise
:type socket_port: str
"""
if self.is_connected():
self._close_management_socket()
try:
self._tn = UDSTelnet(socket_host, socket_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:'******'\n')
# self.tn.read_until('SUCCESS:', 2)
if self._tn:
self._tn.read_eager()
# XXX move this to the Errback
except Exception as e:
logger.warning("Could not connect to OpenVPN yet: %r" % (e,))
self._tn = None
def _connect_management(self, socket_host, socket_port):
"""
Connects to the management interface on the specified
socket_host socket_port.
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix
socket, or port otherwise
:type socket_port: str
"""
if self.is_connected():
self._close_management_socket()
try:
self._tn = UDSTelnet(socket_host, socket_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:'******'\n')
# self.tn.read_until('SUCCESS:', 2)
if self._tn:
self._tn.read_eager()
# XXX move this to the Errback
except Exception as e:
logger.warning("Could not connect to OpenVPN yet: %r" % (e,))
self._tn = None
class VPNManager(object):
"""
This is a mixin that we use in the VPNProcess class.
Here we get together all methods related with the openvpn management
interface.
A copy of a QObject containing signals as attributes is passed along
upon initialization, and we use that object to emit signals to qt-land.
For more info about management methods::
zcat `dpkg -L openvpn | grep management`
"""
# Timers, in secs
# NOTE: We need to set a bigger poll time in OSX because it seems
# openvpn malfunctions when you ask it a lot of things in a short
# amount of time.
POLL_TIME = 2.5 if IS_MAC else 1.0
CONNECTION_RETRY_TIME = 1
def __init__(self, signaler=None):
"""
Initializes the VPNManager.
:param signaler: Signaler object used to send notifications to the
backend
:type signaler: backend.Signaler
"""
self._tn = None
self._signaler = signaler
self._aborted = False
@property
def aborted(self):
return self._aborted
@aborted.setter
def aborted(self, value):
self._aborted = value
def _seek_to_eof(self):
"""
Read as much as available. Position seek pointer to end of stream
"""
try:
self._tn.read_eager()
except EOFError:
logger.debug("Could not read from socket. Assuming it died.")
return
def _send_command(self, command, until=b"END"):
"""
Sends a command to the telnet connection and reads until END
is reached.
:param command: command to send
:type command: str
:param until: byte delimiter string for reading command output
:type until: byte str
:return: response read
:rtype: list
"""
# leap_assert(self._tn, "We need a tn connection!")
try:
self._tn.write("%s\n" % (command,))
buf = self._tn.read_until(until, 2)
self._seek_to_eof()
blist = buf.split('\r\n')
if blist[-1].startswith(until):
del blist[-1]
return blist
else:
return []
except socket.error:
# XXX should get a counter and repeat only
# after mod X times.
logger.warning('socket error (command was: "%s")' % (command,))
self._close_management_socket(announce=False)
logger.debug('trying to connect to management again')
self.try_to_connect_to_management(max_retries=5)
return []
# XXX should move this to a errBack!
except Exception as e:
logger.warning("Error sending command %s: %r" %
(command, e))
return []
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()
self._tn = None
def _connect_management(self, socket_host, socket_port):
"""
Connects to the management interface on the specified
socket_host socket_port.
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix
socket, or port otherwise
:type socket_port: str
"""
if self.is_connected():
self._close_management_socket()
try:
self._tn = UDSTelnet(socket_host, socket_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:'******'\n')
# self.tn.read_until('SUCCESS:', 2)
if self._tn:
self._tn.read_eager()
# XXX move this to the Errback
except Exception as e:
logger.warning("Could not connect to OpenVPN yet: %r" % (e,))
self._tn = None
def _connectCb(self, *args):
"""
Callback for connection.
:param args: not used
"""
if self._tn:
logger.info('Connected to management')
else:
logger.debug('Cannot connect to management...')
def _connectErr(self, failure):
"""
Errorback for connection.
:param failure: Failure
"""
logger.warning(failure)
def connect_to_management(self, host, port):
"""
Connect to a management interface.
:param host: the host of the management interface
:type host: str
:param port: the port of the management interface
:type port: str
:returns: a deferred
"""
self.connectd = defer.maybeDeferred(
self._connect_management, host, port)
self.connectd.addCallbacks(self._connectCb, self._connectErr)
return self.connectd
def is_connected(self):
"""
Returns the status of the management interface.
:returns: True if connected, False otherwise
:rtype: bool
"""
return True if self._tn else False
def try_to_connect_to_management(self, retry=0, max_retries=None):
"""
Attempts to connect to a management interface, and retries
after CONNECTION_RETRY_TIME if not successful.
:param retry: number of the retry
:type retry: int
"""
if max_retries and retry > max_retries:
logger.warning("Max retries reached while attempting to connect "
"to management. Aborting.")
self.aborted = True
return
# _alive flag is set in the VPNProcess class.
if not self._alive:
logger.debug('Tried to connect to management but process is '
'not alive.')
return
logger.debug('trying to connect to management')
if not self.aborted and not self.is_connected():
self.connect_to_management(self._socket_host, self._socket_port)
reactor.callLater(
self.CONNECTION_RETRY_TIME,
self.try_to_connect_to_management, retry + 1)
def _parse_state_and_notify(self, output):
"""
Parses the output of the state command and emits state_changed
signal when the state changes.
:param output: list of lines that the state command printed as
its output
:type output: list
"""
for line in output:
stripped = line.strip()
if stripped == "END":
continue
parts = stripped.split(",")
if len(parts) < 5:
continue
ts, status_step, ok, ip, remote = parts
state = status_step
if state != self._last_state:
if self._signaler is not None:
self._signaler.signal(self._signaler.eip_state_changed, state)
self._last_state = state
def _parse_status_and_notify(self, output):
"""
Parses the output of the status command and emits
status_changed signal when the status changes.
:param output: list of lines that the status command printed
as its output
:type output: list
"""
tun_tap_read = ""
tun_tap_write = ""
for line in output:
stripped = line.strip()
if stripped.endswith("STATISTICS") or stripped == "END":
continue
parts = stripped.split(",")
if len(parts) < 2:
continue
text, value = parts
# text can be:
# "TUN/TAP read bytes"
# "TUN/TAP write bytes"
# "TCP/UDP read bytes"
# "TCP/UDP write bytes"
# "Auth read bytes"
if text == "TUN/TAP read bytes":
tun_tap_read = value # download
elif text == "TUN/TAP write bytes":
tun_tap_write = value # upload
status = (tun_tap_read, tun_tap_write)
if status != self._last_status:
if self._signaler is not None:
self._signaler.signal(self._signaler.eip_status_changed, status)
self._last_status = status
def get_state(self):
"""
Notifies the gui of the output of the state command over
the openvpn management interface.
"""
if self.is_connected():
return self._parse_state_and_notify(self._send_command("state"))
def get_status(self):
"""
Notifies the gui of the output of the status command over
the openvpn management interface.
"""
if self.is_connected():
return self._parse_status_and_notify(self._send_command("status"))
@property
def vpn_env(self):
"""
Return a dict containing the vpn environment to be used.
"""
return self._launcher.get_vpn_env()
def terminate_openvpn(self, shutdown=False):
"""
Attempts to terminate openvpn by sending a SIGTERM.
"""
if self.is_connected():
self._send_command("signal SIGTERM")
if shutdown:
self._cleanup_tempfiles()
def _cleanup_tempfiles(self):
"""
Remove all temporal files we might have left behind.
Iif self.port is 'unix', we have created a temporal socket path that,
under normal circumstances, we should be able to delete.
"""
if self._socket_port == "unix":
logger.debug('cleaning socket file temp folder')
tempfolder = first(os.path.split(self._socket_host))
if tempfolder and os.path.isdir(tempfolder):
try:
shutil.rmtree(tempfolder)
except OSError:
logger.error('could not delete tmpfolder %s' % tempfolder)
def get_openvpn_process(self):
"""
Looks for openvpn instances running.
:rtype: process
"""
openvpn_process = None
for p in psutil.process_iter():
try:
# XXX Not exact!
# Will give false positives.
# we should check that cmdline BEGINS
# with openvpn or with our wrapper
# (pkexec / osascript / whatever)
# This needs more work, see #3268, but for the moment
# we need to be able to filter out arguments in the form
# --openvpn-foo, since otherwise we are shooting ourselves
# in the feet.
if PSUTIL_2:
cmdline = p.cmdline()
else:
cmdline = p.cmdline
if any(map(lambda s: s.find(
"LEAPOPENVPN") != -1, cmdline)):
openvpn_process = p
break
except psutil_AccessDenied:
pass
return openvpn_process
def stop_if_already_running(self):
"""
Checks if VPN is already running and tries to stop it.
Might raise OpenVPNAlreadyRunning.
:return: True if stopped, False otherwise
"""
process = self.get_openvpn_process()
if not process:
logger.debug('Could not find openvpn process while '
'trying to stop it.')
return
logger.debug("OpenVPN is already running, trying to stop it...")
cmdline = process.cmdline
manag_flag = "--management"
if isinstance(cmdline, list) and manag_flag in cmdline:
# we know that our invocation has this distinctive fragment, so
# we use this fingerprint to tell other invocations apart.
# this might break if we change the configuration path in the
# launchers
smellslikeleap = lambda s: "leap" in s and "providers" in s
if not any(map(smellslikeleap, cmdline)):
logger.debug("We cannot stop this instance since we do not "
"recognise it as a leap invocation.")
raise AlienOpenVPNAlreadyRunning
try:
index = cmdline.index(manag_flag)
host = cmdline[index + 1]
port = cmdline[index + 2]
logger.debug("Trying to connect to %s:%s"
% (host, port))
self.connect_to_management(host, port)
# XXX this has a problem with connections to different
# remotes. So the reconnection will only work when we are
# terminating instances left running for the same provider.
# If we are killing an openvpn instance configured for another
# provider, we will get:
# TLS Error: local/remote TLS keys are out of sync
# However, that should be a rare case right now.
self._send_command("signal SIGTERM")
self._close_management_socket(announce=True)
except (Exception, AssertionError) as e:
logger.warning("Problem trying to terminate OpenVPN: %r"
% (e,))
else:
logger.debug("Could not find the expected openvpn command line.")
process = self.get_openvpn_process()
if process is None:
logger.debug("Successfully finished already running "
"openvpn process.")
return True
else:
logger.warning("Unable to terminate OpenVPN")
raise OpenVPNAlreadyRunning
class VPNManager(object):
"""
This is a mixin that we use in the VPNProcess class.
Here we get together all methods related with the openvpn management
interface.
A copy of a QObject containing signals as attributes is passed along
upon initialization, and we use that object to emit signals to qt-land.
For more info about management methods::
zcat `dpkg -L openvpn | grep management`
"""
# Timers, in secs
# NOTE: We need to set a bigger poll time in OSX because it seems
# openvpn malfunctions when you ask it a lot of things in a short
# amount of time.
POLL_TIME = 2.5 if IS_MAC else 1.0
CONNECTION_RETRY_TIME = 1
def __init__(self, signaler=None):
"""
Initializes the VPNManager.
:param signaler: Signaler object used to send notifications to the
backend
:type signaler: backend.Signaler
"""
self._tn = None
self._signaler = signaler
self._aborted = False
@property
def aborted(self):
return self._aborted
@aborted.setter
def aborted(self, value):
self._aborted = value
def _seek_to_eof(self):
"""
Read as much as available. Position seek pointer to end of stream
"""
try:
self._tn.read_eager()
except EOFError:
logger.debug("Could not read from socket. Assuming it died.")
return
def _send_command(self, command, until=b"END"):
"""
Sends a command to the telnet connection and reads until END
is reached.
:param command: command to send
:type command: str
:param until: byte delimiter string for reading command output
:type until: byte str
:return: response read
:rtype: list
"""
# leap_assert(self._tn, "We need a tn connection!")
try:
self._tn.write("%s\n" % (command,))
buf = self._tn.read_until(until, 2)
self._seek_to_eof()
blist = buf.split('\r\n')
if blist[-1].startswith(until):
del blist[-1]
return blist
else:
return []
except socket.error:
# XXX should get a counter and repeat only
# after mod X times.
logger.warning('socket error (command was: "%s")' % (command,))
self._close_management_socket(announce=False)
logger.debug('trying to connect to management again')
self.try_to_connect_to_management(max_retries=5)
return []
# XXX should move this to a errBack!
except Exception as e:
logger.warning("Error sending command %s: %r" %
(command, e))
return []
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()
self._tn = None
def _connect_management(self, socket_host, socket_port):
"""
Connects to the management interface on the specified
socket_host socket_port.
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix
socket, or port otherwise
:type socket_port: str
"""
if self.is_connected():
self._close_management_socket()
try:
self._tn = UDSTelnet(socket_host, socket_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:'******'\n')
# self.tn.read_until('SUCCESS:', 2)
if self._tn:
self._tn.read_eager()
# XXX move this to the Errback
except Exception as e:
logger.warning("Could not connect to OpenVPN yet: %r" % (e,))
self._tn = None
def _connectCb(self, *args):
"""
Callback for connection.
:param args: not used
"""
if self._tn:
logger.info('Connected to management')
else:
logger.debug('Cannot connect to management...')
def _connectErr(self, failure):
"""
Errorback for connection.
:param failure: Failure
"""
logger.warning(failure)
def connect_to_management(self, host, port):
"""
Connect to a management interface.
:param host: the host of the management interface
:type host: str
:param port: the port of the management interface
:type port: str
:returns: a deferred
"""
self.connectd = defer.maybeDeferred(
self._connect_management, host, port)
self.connectd.addCallbacks(self._connectCb, self._connectErr)
return self.connectd
def is_connected(self):
"""
Returns the status of the management interface.
:returns: True if connected, False otherwise
:rtype: bool
"""
return True if self._tn else False
def try_to_connect_to_management(self, retry=0, max_retries=None):
"""
Attempts to connect to a management interface, and retries
after CONNECTION_RETRY_TIME if not successful.
:param retry: number of the retry
:type retry: int
"""
if max_retries and retry > max_retries:
logger.warning("Max retries reached while attempting to connect "
"to management. Aborting.")
self.aborted = True
return
# _alive flag is set in the VPNProcess class.
if not self._alive:
logger.debug('Tried to connect to management but process is '
'not alive.')
return
logger.debug('trying to connect to management')
if not self.aborted and not self.is_connected():
self.connect_to_management(self._socket_host, self._socket_port)
reactor.callLater(
self.CONNECTION_RETRY_TIME,
self.try_to_connect_to_management, retry + 1)
def _parse_state_and_notify(self, output):
"""
Parses the output of the state command and emits state_changed
signal when the state changes.
:param output: list of lines that the state command printed as
its output
:type output: list
"""
for line in output:
stripped = line.strip()
if stripped == "END":
continue
parts = stripped.split(",")
if len(parts) < 5:
continue
ts, status_step, ok, ip, remote = parts
state = status_step
if state != self._last_state:
if self._signaler is not None:
self._signaler.signal(self._signaler.eip_state_changed, state)
self._last_state = state
def _parse_status_and_notify(self, output):
"""
Parses the output of the status command and emits
status_changed signal when the status changes.
:param output: list of lines that the status command printed
as its output
:type output: list
"""
tun_tap_read = ""
tun_tap_write = ""
for line in output:
stripped = line.strip()
if stripped.endswith("STATISTICS") or stripped == "END":
continue
parts = stripped.split(",")
if len(parts) < 2:
continue
text, value = parts
# text can be:
# "TUN/TAP read bytes"
# "TUN/TAP write bytes"
# "TCP/UDP read bytes"
# "TCP/UDP write bytes"
# "Auth read bytes"
if text == "TUN/TAP read bytes":
tun_tap_read = value # download
elif text == "TUN/TAP write bytes":
tun_tap_write = value # upload
status = (tun_tap_read, tun_tap_write)
if status != self._last_status:
if self._signaler is not None:
self._signaler.signal(self._signaler.eip_status_changed, status)
self._last_status = status
def get_state(self):
"""
Notifies the gui of the output of the state command over
the openvpn management interface.
"""
if self.is_connected():
return self._parse_state_and_notify(self._send_command("state"))
def get_status(self):
"""
Notifies the gui of the output of the status command over
the openvpn management interface.
"""
if self.is_connected():
return self._parse_status_and_notify(self._send_command("status"))
@property
def vpn_env(self):
"""
Return a dict containing the vpn environment to be used.
"""
return self._launcher.get_vpn_env()
def terminate_openvpn(self, shutdown=False):
"""
Attempts to terminate openvpn by sending a SIGTERM.
"""
if self.is_connected():
self._send_command("signal SIGTERM")
if shutdown:
self._cleanup_tempfiles()
def _cleanup_tempfiles(self):
"""
Remove all temporal files we might have left behind.
Iif self.port is 'unix', we have created a temporal socket path that,
under normal circumstances, we should be able to delete.
"""
if self._socket_port == "unix":
logger.debug('cleaning socket file temp folder')
tempfolder = first(os.path.split(self._socket_host))
if tempfolder and os.path.isdir(tempfolder):
try:
shutil.rmtree(tempfolder)
except OSError:
logger.error('could not delete tmpfolder %s' % tempfolder)
def get_openvpn_process(self):
"""
Looks for openvpn instances running.
:rtype: process
"""
openvpn_process = None
for p in psutil.process_iter():
try:
# XXX Not exact!
# Will give false positives.
# we should check that cmdline BEGINS
# with openvpn or with our wrapper
# (pkexec / osascript / whatever)
# This needs more work, see #3268, but for the moment
# we need to be able to filter out arguments in the form
# --openvpn-foo, since otherwise we are shooting ourselves
# in the feet.
if PSUTIL_2:
cmdline = p.cmdline()
else:
cmdline = p.cmdline
if any(map(lambda s: s.find(
"LEAPOPENVPN") != -1, cmdline)):
openvpn_process = p
break
except psutil_AccessDenied:
pass
return openvpn_process
def stop_if_already_running(self):
"""
Checks if VPN is already running and tries to stop it.
Might raise OpenVPNAlreadyRunning.
:return: True if stopped, False otherwise
"""
process = self.get_openvpn_process()
if not process:
logger.debug('Could not find openvpn process while '
'trying to stop it.')
return
logger.debug("OpenVPN is already running, trying to stop it...")
cmdline = process.cmdline
manag_flag = "--management"
if isinstance(cmdline, list) and manag_flag in cmdline:
# we know that our invocation has this distinctive fragment, so
# we use this fingerprint to tell other invocations apart.
# this might break if we change the configuration path in the
# launchers
smellslikeleap = lambda s: "leap" in s and "providers" in s
if not any(map(smellslikeleap, cmdline)):
logger.debug("We cannot stop this instance since we do not "
"recognise it as a leap invocation.")
raise AlienOpenVPNAlreadyRunning
try:
index = cmdline.index(manag_flag)
host = cmdline[index + 1]
port = cmdline[index + 2]
logger.debug("Trying to connect to %s:%s"
% (host, port))
self.connect_to_management(host, port)
# XXX this has a problem with connections to different
# remotes. So the reconnection will only work when we are
# terminating instances left running for the same provider.
# If we are killing an openvpn instance configured for another
# provider, we will get:
# TLS Error: local/remote TLS keys are out of sync
# However, that should be a rare case right now.
self._send_command("signal SIGTERM")
self._close_management_socket(announce=True)
except (Exception, AssertionError) as e:
logger.warning("Problem trying to terminate OpenVPN: %r"
% (e,))
else:
logger.debug("Could not find the expected openvpn command line.")
process = self.get_openvpn_process()
if process is None:
logger.debug("Successfully finished already running "
"openvpn process.")
return True
else:
logger.warning("Unable to terminate OpenVPN")
raise OpenVPNAlreadyRunning
