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ChatOTR.py
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ChatOTR.py
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# Copyright (C) 2013 AG Projects. See LICENSE for details.
#
from AppKit import NSApp, NSOKButton, NSCancelButton, NSOnState
from Foundation import NSObject, NSBundle, NSColor, NSLocalizedString, NSTimer, NSRunLoop, NSRunLoopCommonModes
import objc
import potr
import potr.crypt
import potr.context
import os
from application.system import makedirs
from sipsimple.streams import ChatStreamError
from sipsimple.util import ISOTimestamp
from util import format_identity_to_string
from resources import ApplicationData
from BlinkLogger import BlinkLogger
DEFAULT_OTR_FLAGS = {
'ALLOW_V1':False,
'ALLOW_V2':True,
'REQUIRE_ENCRYPTION':False,
'SEND_TAG':True,
'WHITESPACE_START_AKE':True,
'ERROR_START_AKE':True,
}
class BlinkOtrContext(potr.context.Context):
def inject(self, msg, appdata=None):
msg = unicode(msg)
if appdata is not None:
stream = appdata.get('stream', None)
if stream is not None:
try:
stream.send_message(msg, timestamp=ISOTimestamp.now())
except ChatStreamError, e:
BlinkLogger().log_error(u"Error sending OTR chat message: %s" % e)
def getPolicy(self, key):
ret = self.user.peer_options[key]
return ret
class BlinkOtrAccount(potr.context.Account):
contextclass = BlinkOtrContext
def __init__(self, peer_options={}):
self.peer_options = DEFAULT_OTR_FLAGS.copy()
self.peer_options.update(peer_options)
path = ApplicationData.get('chat')
makedirs(path)
super(BlinkOtrAccount, self).__init__('blink', 'sip', '1024', privkey=None)
self.defaultQuery = b'?OTRv{versions}?\n{accountname} has requested ' \
b'end-to-end encryption but this ' \
b'software does not support this feature. ';
self.keyFilePath = ApplicationData.get('chat/private_key.dsa')
self.trustedPeersPath = ApplicationData.get('chat/trusted_peers')
def dropPrivkey(self):
if os.path.exists(self.keyFilePath):
try:
os.remove(self.keyFilePath)
except OSError:
pass
self.privkey = None
def loadPrivkey(self):
try:
with open(self.keyFilePath, 'rb') as keyFile:
return potr.crypt.PK.parsePrivateKey(keyFile.read())[0]
except IOError, e:
if e.errno != 2:
BlinkLogger().log_error('IO Error occurred when loading OTR private key file')
return None
def savePrivkey(self):
try:
with open(self.keyFilePath, 'wb') as keyFile:
keyFile.write(self.getPrivkey().serializePrivateKey())
except IOError, e:
BlinkLogger().log_error('IO Error occurred when loading OTR private key file')
def loadTrusts(self, newCtxCb=None):
try:
with open(self.trustedPeersPath, 'r') as fprFile:
for line in fprFile:
ctx, fpr, trust = line[:-1].split('\t')
self.setTrust(ctx, fpr, trust)
except IOError, e:
if e.errno != 2:
BlinkLogger().log_error('IO Error occurred when loading OTR trusted file')
def saveTrusts(self):
try:
with open(self.trustedPeersPath, 'w') as fprFile:
for uid, trusts in self.trusts.iteritems():
for fpr, trustVal in trusts.iteritems():
fprFile.write('\t'.join((uid, fpr, trustVal)))
fprFile.write('\n')
except IOError, e:
BlinkLogger().log_error('IOError occurred when loading trusted file for %s', self.name)
def getTrusts(self, key):
try:
return self.trusts[key]
except KeyError:
return []
def removeFingerprint(self, key, fingerprint):
if key in self.trusts and fingerprint in self.trusts[key]:
del self.trusts[key][fingerprint]
self.saveTrusts()
class ChatOtrSmp(NSObject):
# used to verify the remote fingerprint using SMP protocol
window = objc.IBOutlet()
labelText = objc.IBOutlet()
secretText = objc.IBOutlet()
questionText = objc.IBOutlet()
progressBar = objc.IBOutlet()
statusText = objc.IBOutlet()
continueButton = objc.IBOutlet()
cancelButton = objc.IBOutlet()
smp_running = False
finished = False
response = None
question = None
timer = None
def __new__(cls, *args, **kwargs):
return cls.alloc().init()
def __init__(self, controller, type='chat'):
self.controller = controller
NSBundle.loadNibNamed_owner_("ChatOtrSmp", self)
self.statusText.setStringValue_('')
self.progressBar.startAnimation_(None)
if type == 'chat':
_t = self.controller.sessionController.getTitleShort()
self.window.setTitle_(NSLocalizedString("Identity Verification for %s", "Window title") % _t)
self.stream = self.controller.stream
self.remote_address = self.controller.sessionController.remoteSIPAddress
self.otr_context_id = self.controller.sessionController.call_id
elif type == 'sms':
_t = format_identity_to_string(self.controller.target_uri)
self.window.setTitle_(NSLocalizedString("Identity Verification for %s", "Window title") % _t)
self.stream = self.controller
self.remote_address = self.controller.remote_uri
self.otr_context_id = self.controller.session_id
else:
self.stream = None
self.remote_address = ''
self.otr_context_id = ''
def close(self):
self.controller = None
if self.timer is not None:
if self.timer.isValid():
self.timer.invalidate()
self.timer = None
self.release()
def dealloc(self):
super(ChatOtrSmp, self).dealloc()
@property
def ctx(self):
return self.controller.otr_account.getContext(self.otr_context_id)
@objc.IBAction
def okClicked_(self, sender):
self.statusText.setTextColor_(NSColor.blackColor())
if self.finished:
self.window.orderOut_(self)
return
secret = self.secretText.stringValue().encode('utf-8')
if not secret:
return
if self.response:
self.ctx.smpGotSecret(secret, appdata={'stream': self.stream})
self.progressBar.setIndeterminate_(False)
self.progressBar.setDoubleValue_(6)
self.continueButton.setEnabled_(False)
self.statusText.setStringValue_('Responding to verification request...')
else:
try:
qtext = self.questionText.stringValue()
if qtext:
self.ctx.smpInit(secret, question=qtext.encode('utf-8'), appdata={'stream': self.stream})
else:
self.ctx.smpInit(secret, appdata={'stream': self.stream})
self.progressBar.setIndeterminate_(False)
self.progressBar.setDoubleValue_(3)
self.statusText.setStringValue_(NSLocalizedString("Verification request sent", "Label"))
self.continueButton.setEnabled_(False)
except potr.context.NotEncryptedError, e:
self.statusText.setStringValue_(NSLocalizedString("Chat session is not OTR encrypted", "Label"))
except RuntimeError, e:
self.statusText.setStringValue_(NSLocalizedString("OTR encryption error: %s", "Label") % e)
except Exception, e:
self.statusText.setStringValue_(NSLocalizedString("Error: %s", "Label") % e)
self.smp_running = True
@objc.IBAction
def cancelClicked_(self, sender):
self.window.orderOut_(self)
self.smp_running = False
try:
self.ctx.smpAbort(appdata={'stream': self.stream})
except potr.context.NotEncryptedError, e:
self.statusText.setStringValue_(NSLocalizedString("Chat session is not OTR encrypted", "Label"))
except RuntimeError, e:
self.statusText.setStringValue_(NSLocalizedString("OTR encryption error: %s", "Label") % e)
except Exception, e:
self.statusText.setStringValue_(NSLocalizedString("Error: %s", "Label") % e)
def get_tlv(self, tlvs, check):
for tlv in tlvs:
if isinstance(tlv, check):
return tlv
return None
def handle_tlv(self, tlvs):
self.statusText.setTextColor_(NSColor.blackColor())
if tlvs:
fingerprint = self.ctx.getCurrentKey()
is1qtlv = self.get_tlv(tlvs, potr.proto.SMP1QTLV)
# check for TLV_SMP_ABORT or state = CHEATED
if self.smp_running and not self.ctx.smpIsValid():
self.statusText.setTextColor_(NSColor.redColor())
self.statusText.setStringValue_(NSLocalizedString("Identity verification failed. Try again later.", "Label"))
self._finish()
# check for TLV_SMP1
elif self.get_tlv(tlvs, potr.proto.SMP1TLV):
self.statusText.setStringValue_(NSLocalizedString("Identity verification request received", "Label"))
self.smp_running = True
self.question = None
self.show(True)
self.progressBar.setIndeterminate_(False)
self.progressBar.setDoubleValue_(3)
# check for TLV_SMP1Q
elif is1qtlv:
self.smp_running = True
self.question = is1qtlv.msg
self.show(True)
self.progressBar.setIndeterminate_(False)
self.progressBar.setDoubleValue_(3)
# check for TLV_SMP2
elif self.get_tlv(tlvs, potr.proto.SMP2TLV):
self.progressBar.setIndeterminate_(False)
self.progressBar.setDoubleValue_(6)
self.statusText.setStringValue_(NSLocalizedString("Identity verification in progress...", "Label"))
# check for TLV_SMP3
elif self.get_tlv(tlvs, potr.proto.SMP3TLV):
if self.ctx.smpIsSuccess():
self.statusText.setTextColor_(NSColor.greenColor())
self.statusText.setStringValue_(NSLocalizedString("Identity verification succeeded", "Label"))
if fingerprint:
self.controller.otr_account.setTrust(self.remote_address, str(fingerprint), 'verified')
self.controller.revalidateToolbar()
self.controller.updateEncryptionWidgets()
self._finish()
else:
self.statusText.setTextColor_(NSColor.redColor())
self.statusText.setStringValue_(NSLocalizedString("Identity verification failed. Try again later.", "Label"))
self._finish()
# check for TLV_SMP4
elif self.get_tlv(tlvs, potr.proto.SMP4TLV):
if self.ctx.smpIsSuccess():
self.statusText.setTextColor_(NSColor.greenColor())
self.statusText.setStringValue_(NSLocalizedString("Identity verification succeeded", "Label"))
if fingerprint:
self.controller.otr_account.setTrust(self.remote_address, str(fingerprint), 'verified')
self.controller.revalidateToolbar()
self.controller.updateEncryptionWidgets()
self._finish()
else:
self.statusText.setTextColor_(NSColor.redColor())
self.statusText.setStringValue_(NSLocalizedString("Identity verification failed. Try again later.", "Label"))
self._finish()
def _finish(self):
self.smp_running = False
self.finished = True
self.secretText.setEnabled_(False)
self.questionText.setEnabled_(False)
self.progressBar.setDoubleValue_(9)
self.continueButton.setEnabled_(True)
self.continueButton.setTitle_(NSLocalizedString("Finish", "Button Title"))
self.cancelButton.setHidden_(True)
self.timer = NSTimer.timerWithTimeInterval_target_selector_userInfo_repeats_(5, self, "verificationFinished:", None, False)
NSRunLoop.currentRunLoop().addTimer_forMode_(self.timer, NSRunLoopCommonModes)
def verificationFinished_(self, timer):
self.okClicked_(None)
def show(self, response=None):
self.secretText.setEnabled_(True)
self.questionText.setEnabled_(True)
self.cancelButton.setHidden_(False)
self.continueButton.setTitle_(NSLocalizedString("Continue", "Button title"))
self.progressBar.setIndeterminate_(True)
self.progressBar.setDoubleValue_(0)
self.smp_running = False
self.finished = False
self.response = response
self.secretText.setStringValue_('')
self.response = response
self.window.makeKeyAndOrderFront_(None)
if response is not None:
self.continueButton.setTitle_(NSLocalizedString("Respond", "Button title"))
self.progressBar.setIndeterminate_(True)
self.continueButton.setEnabled_(True)
if self.question is None:
self.questionText.setHidden_(True)
self.labelText.setStringValue_(NSLocalizedString("%s wants to verify your identity using a commonly known secret.", "Label") % self.remote_address)
else:
self.questionText.setHidden_(False)
self.secretText.setHidden_(False)
self.questionText.setStringValue_(self.question)
self.questionText.setEnabled_(False)
self.labelText.setStringValue_(NSLocalizedString("%s has asked you a question to verify your identity:", "Label") % self.remote_address)
else:
self.statusText.setStringValue_('')
self.continueButton.setEnabled_(True)
self.questionText.setHidden_(False)
self.questionText.setStringValue_('')
self.questionText.setEnabled_(True)
self.labelText.setStringValue_(NSLocalizedString("You want to verify the identity of %s using a commonly known secret. Optionally, you can ask a question as a hint.", "Label") % self.remote_address)