def testDecidBad(self):
# try decoding a non integer ciphertext
c = Crypto('some secret key_')
plaintext = 'foo'
ciphertext = c.enc(plaintext)
with throwing(CryptoException):
plaintext2 = c.decid(ciphertext)
def update_password(self, session_id, new_password):
session = self.session_dao.find_user_by_session(session_id)
if session is None:
raise Exception('La sesión es inválida.')
crypto = Crypto()
new_hashed_password = crypto.cypher(new_password)
self.users_dao.update_user_password(session.username, new_hashed_password)
def login(self, username, password):
user = self.users_dao.find_by_username(username)
if user is None:
raise Exception('El usuario y/o contraseña son incorrectos, por favor intenta de nuevo.')
crypto = Crypto()
if not crypto.verify_encrypted_password(password, user.password):
raise Exception('El usuario y/o contraseña son incorrectos, por favor intenta de nuevo.')
session_uuid = str(uuid.uuid4())
session = Session(username, session_uuid)
self.session_dao.save_session(session)
return session_uuid
def loadOrGenerateKepair(self):
self.crypto = Crypto()
if utils.doesSavedKeypairExist():
while(True):
passphrase = self.getKeypairPassphrase()
try:
utils.loadKeypair(self.crypto, passphrase)
break
except exceptions.CryptoError:
CursesDialog(self.screen, errors.BAD_PASSPHRASE, '', isBlocking=True).show()
# We still need to generate an AES key
self.crypto.generateAESKey()
else:
self.crypto.generateKeys()
def __init__(self, addr, sock=None, crypto=None):
self.addr = addr
self.isEncrypted = False
self.encryptType = None
# Create a new socket if one was not given
if sock is None:
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.isConnected = False
else:
self.sock = sock
self.isConnected = True
# Create a crypto object if one was not given
if crypto is None:
self.crypto = Crypto()
self.crypto.generateKeys()
else:
self.crypto = crypto
def __loadOrGenerateKepair(self):
self.crypto = Crypto()
if utils.doesSavedKeypairExist():
while(True):
passphrase = qtUtils.getKeypairPassphrase(self.isLightTheme)
# Restart the application if the user did not provide a passphrase
if passphrase is None:
self.__restart()
return
try:
utils.loadKeypair(self.crypto, passphrase)
break
except exceptions.CryptoError:
QMessageBox.warning(self.chatWindow, errors.BAD_PASSPHRASE, errors.BAD_PASSPHRASE_VERBOSE)
# We still need to generate an AES key
self.crypto.generateAESKey()
else:
self.crypto.generateKeys()
def signup(self):
return cryptoUtil.generateId(self.verify_key)
def testEncDec(self):
c = Crypto('some secret key_')
plaintext = 'foo'
ciphertext = c.enc(plaintext)
plaintext2 = c.dec(ciphertext)
assert plaintext == plaintext2
def testEncidBad(self):
# try encoding a non integer
c = Crypto('some secret key_')
plaintext = 'foo'
with throwing(CryptoException):
ciphertext = c.encid(plaintext)
def testEncidDecid(self):
c = Crypto('some secret key_')
plaintext = 1
ciphertext = c.encid(plaintext)
plaintext2 = c.decid(ciphertext)
assert plaintext == plaintext2
class QtUI(QApplication):
def __init__(self, argv, mode, port, host):
QApplication.__init__(self, argv)
self.mode = mode
self.port = port
self.host = host
self.isEventLoopRunning = False
self.connectedToClient = False
self.isLightTheme = qtUtils.isLightTheme(self.palette().color(QPalette.Window))
self.aboutToQuit.connect(self.stop)
def start(self):
self.timer = QTimer()
self.timer.start(500)
self.timer.timeout.connect(lambda: None)
# Show mode dialog if a mode wasn't given
if self.mode is None:
self.mode = QModeDialog.getMode(self.isLightTheme)
# If the user closed the mode dialog by not selected a mode, stop the app
if self.mode is None:
qtUtils.exitApp()
# Show the chat window
self.chatWindow = QChatWindow(None, None, self.isLightTheme)
self.chatWindow.show()
self.__loadOrGenerateKepair()
if self.mode == constants.MODE_SERVER:
self.__startServer()
self.__waitForClient()
elif self.mode == constants.MODE_CLIENT:
# Get the host if not given
if self.host is None:
self.host, ok = QInputDialog.getText(self.chatWindow, "Hostname", "Host:")
if not ok:
self.__restart()
return
self.__connectToServer()
if not self.isEventLoopRunning:
self.isEventLoopRunning = True
self.exec_()
def stop(self):
self.__endConnections()
self.quit()
def __restart(self):
self.__endConnections()
self.__restartHelper()
self.start()
def __endConnections(self):
if hasattr(self, 'acceptThread'):
self.acceptThread.quit()
elif hasattr(self, 'connectThread'):
self.connectThread.quit()
if hasattr(self, 'sendThread'):
self.sendThread.quit()
if hasattr(self, 'recvThread'):
self.recvThread.quit()
# If a client is connected, try to end the connection gracefully
if hasattr(self, 'client'):
self.client.disconnect()
if hasattr(self, 'server'):
self.server.stop()
def __restartHelper(self):
self.mode = None
self.host = None
self.closeAllWindows()
if hasattr(self, 'waitingDialog'):
del self.waitingDialog
if hasattr(self, 'chatWindow'):
del self.chatWindow
def __loadOrGenerateKepair(self):
self.crypto = Crypto()
if utils.doesSavedKeypairExist():
while(True):
passphrase = qtUtils.getKeypairPassphrase(self.isLightTheme)
# Restart the application if the user did not provide a passphrase
if passphrase is None:
self.__restart()
return
try:
utils.loadKeypair(self.crypto, passphrase)
break
except exceptions.CryptoError:
QMessageBox.warning(self.chatWindow, errors.BAD_PASSPHRASE, errors.BAD_PASSPHRASE_VERBOSE)
# We still need to generate an AES key
self.crypto.generateAESKey()
else:
self.crypto.generateKeys()
def __startServer(self):
try:
self.server = Server()
self.server.start(int(self.port))
except exceptions.NetworkError as ne:
QMessageBox.critical(self.chatWindow, errors.FAILED_TO_START_SERVER, errors.FAILED_TO_START_SERVER + ": " + str(ne))
self.__restart()
def __waitForClient(self):
# Start the accept thread
self.acceptThread = qtThreads.QtServerAcceptThread(self.server, self.crypto, self.__postAccept)
self.acceptThread.start()
# Show the waiting dialog
self.waitingDialog = QWaitingDialog(self.chatWindow, "Waiting for connection...", self.isLightTheme, self.__userClosedWaitingDialog, showIP=True)
self.waitingDialog.show()
def __connectToServer(self):
# Create the client object to use for the connection
self.client = Client(constants.MODE_CLIENT, (self.host, self.port), crypto=self.crypto)
# Start the connect thread
self.connectThread = qtThreads.QtServerConnectThread(self.client, self.__postConnect, self.__connectFailure)
self.connectThread.start()
# Show the waiting dialog
self.waitingDialog = QWaitingDialog(self.chatWindow, "Connecting to server...", self.isLightTheme, self.__userClosedWaitingDialog)
self.waitingDialog.show()
@pyqtSlot(Client)
def __postAccept(self, client):
self.connectedToClient = True
self.client = client
self.waitingDialog.close()
# Show the accept dialog
accept = QAcceptDialog.getAnswer(self.chatWindow, self.client.getHostname())
# If not accepted, disconnect and wait for a client again
if not accept:
self.client.disconnect()
self.__waitForClient()
return
# Do the handshake with the client
try:
client.doHandshake()
except exceptions.NetworkError as ne:
self.client.disconnect()
self.__waitForClient()
self.__startChat()
@pyqtSlot()
def __postConnect(self):
self.connectedToClient = True
self.waitingDialog.close()
self.__startChat()
@pyqtSlot(str)
def __connectFailure(self, errorMessage):
QMessageBox.critical(self.chatWindow, errors.FAILED_TO_CONNECT, errorMessage)
self.__restart()
@pyqtSlot()
def __userClosedWaitingDialog(self):
self.waitingDialog.hide()
# If the waiting dialog was closed before we connected to the client,
# it means that the user closed the dialog and we should restart the app
if not self.connectedToClient:
self.__restart()
def __startChat(self):
# Start the sending and receiving thread
self.recvThread = qtThreads.QtRecvThread(self.client, self.chatWindow.appendMessage, self.__threadError)
self.recvThread.start()
self.sendThread = qtThreads.QtSendThread(self.client, self.__threadError)
self.sendThread.start()
self.chatWindow.client = self.client
self.chatWindow.messageQueue = self.sendThread.messageQueue
self.chatWindow.showNowChattingMessage()
@pyqtSlot(str, str)
def __threadError(self, title, message):
QMessageBox.critical(self.chatWindow, title, message)
self.__restart()
def create_user(self, username, email, password):
self.validate_user_data(username, email, password)
crypto = Crypto()
hashed_password = crypto.cypher(password)
return self.users_dao.create_user(User(username, email, hashed_password))
class NcursesUI(object):
def __init__(self, mode, port, host):
self.mode = mode
self.port = port
self.host = host
def start(self):
curses.wrapper(self.run)
def stop(self):
# If a client is connected, try to end the connection gracefully
if hasattr(self, 'client'):
self.client.disconnect()
if hasattr(self, 'server'):
self.server.stop()
def run(self, screen):
self.screen = screen
(self.height, self.width) = self.screen.getmaxyx()
# Change the colors, clear the screen and set the overall border
self.setColors()
self.screen.clear()
self.screen.border(0)
# Create the status and chat input windows
self.makeChatWindow()
self.makeStatusWindow()
self.makeChatInputWindow()
self.screen.refresh()
# Try to load a keypair if one was saved or generate a new keypair
self.loadOrGenerateKepair()
# Show the options menu
self.showOptionsMenuWindow(showStartOption=True)
# Get the server/client mode if not given
if self.mode == None:
self.showOptionsWindow()
if self.mode == constants.MODE_SERVER:
self.startServer()
self.waitForClient()
elif self.mode == constants.MODE_CLIENT:
# Get the host if not given
if self.host == None:
self.getHost()
self.connectToServer()
self.handleNewConnection()
def waitForClient(self):
while True:
# Show the waiting for connections dialog
dialogWindow = CursesDialog(self.screen, "Waiting for connection...")
dialogWindow.show()
self.client = self.server.accept(self.crypto)
dialogWindow.hide()
# Show the accept dialog
if self.showAcceptWindow() == ACCEPT:
break
else:
self.client.disconnect()
# Do the handshake with the client
try:
self.client.doHandshake()
except exceptions.NetworkError as ne:
CursesDialog(self.screen, str(ne), errors.TITLE_NETWORK_ERROR, isError=True).show()
self.client.disconnect()
except exceptions.CryptoError as ce:
CursesDialog(self.screen, str(ce), errors.TITLE_CRYPTO_ERROR, isError=True).show()
self.client.disconnect()
def connectToServer(self):
try:
dialogWindow = CursesDialog(self.screen, "Connecting to server...", "", False)
dialogWindow.show()
self.client = Client(constants.MODE_CLIENT, (self.host, self.port), crypto=self.crypto)
self.client.connect()
except exceptions.GenericError as ge:
CursesDialog(self.screen, str(ge), errors.FAILED_TO_CONNECT, isError=True).show()
# Do the handshake with the server
try:
self.client.doHandshake()
dialogWindow.hide()
except exceptions.NetworkError as ne:
self.client.disconnect()
dialogWindow.hide()
CursesDialog(self.screen, str(ne), errors.TITLE_NETWORK_ERROR, isError=True).show()
except exceptions.CryptoError as ce:
self.client.disconnect()
dialogWindow.hide()
CursesDialog(self.screen, str(ce), errors.TITLE_CRYPTO_ERROR, isError=True).show()
def handleNewConnection(self):
# Set the hostname of who we're connected to in the status window
self.setStatusWindow()
# Add a hint on how to display the options menu
self.screen.addstr(0, 5, "Ctrl+U for options")
self.screen.refresh()
# Start the sending and receiving threads
self.startThreads()
# Keep the main thread alive so the daemon threads don't die
while True:
time.sleep(10)
def startThreads(self):
ncursesThreads.CursesSendThread(self).start()
ncursesThreads.CursesRecvThread(self).start()
def setColors(self):
if curses.has_colors():
curses.init_pair(1, curses.COLOR_GREEN, curses.COLOR_BLACK)
curses.init_pair(2, curses.COLOR_RED, curses.COLOR_BLACK)
curses.init_pair(3, curses.COLOR_CYAN, curses.COLOR_BLACK)
curses.init_pair(4, curses.COLOR_BLACK, curses.COLOR_GREEN)
self.screen.bkgd(curses.color_pair(1))
def showOptionsWindow(self):
optionsWindow = self.screen.subwin(6, 11, self.height/2 - 3, self.width/2 - 6)
optionsWindow.border(0)
# Enable arrow key detection for this window
optionsWindow.keypad(True)
# Disable the cursor
curses.curs_set(0)
optionsWindow.addstr(1, 1, "Run as:")
pos = constants.MODE_SERVER
while True:
if pos == constants.MODE_SERVER:
optionsWindow.addstr(3, 2, "Server", curses.color_pair(4))
optionsWindow.addstr(4, 2, "Client")
else:
optionsWindow.addstr(3, 2, "Server")
optionsWindow.addstr(4, 2, "Client", curses.color_pair(4))
self.screen.refresh()
key = optionsWindow.getch()
# Enter key
if key == ord('\n'):
break
elif pos == constants.MODE_SERVER:
pos = constants.MODE_CLIENT
elif pos == constants.MODE_CLIENT:
pos = constants.MODE_SERVER
# Re-enable the cursor
curses.curs_set(2)
# Get rid of the options window
optionsWindow.clear()
optionsWindow.refresh()
self.mode = pos
def showAcceptWindow(self):
dialogWidth = 23 + len(self.client.getHostname());
acceptWindow = self.screen.subwin(6, dialogWidth, self.height/2 - 3, self.width/2 - int(dialogWidth/2))
acceptWindow.border(0)
# Enable arrow key detection for this window
acceptWindow.keypad(True)
# Disable the cursor
curses.curs_set(0)
acceptWindow.addstr(1, 1, "Got connection from %s" % self.client.getHostname())
pos = ACCEPT
while True:
if pos == ACCEPT:
acceptWindow.addstr(3, 2, "Accept", curses.color_pair(4))
acceptWindow.addstr(4, 2, "Reject")
else:
acceptWindow.addstr(3, 2, "Accept")
acceptWindow.addstr(4, 2, "Reject", curses.color_pair(4))
self.screen.refresh()
key = acceptWindow.getch()
# Enter key
if key == ord('\n'):
break
elif pos == ACCEPT:
pos = REJECT
elif pos == REJECT:
pos = ACCEPT
# Re-enable the cursor
curses.curs_set(2)
# Get rid of the accept window
acceptWindow.clear()
acceptWindow.refresh()
return pos
def makeChatWindow(self):
self.chatWindow = self.screen.subwin(self.height-4, self.width-2, 1, 1)
self.chatWindow.scrollok(True)
def makeStatusWindow(self):
self.statusWindow = self.screen.subwin(self.height-3, self.width-23)
self.statusWindow.border(0)
self.statusWindow.addstr(1, 1, "Disconnected")
def makeChatInputWindow(self):
self.textboxWindow = self.screen.subwin(1, self.width-25, self.height-2, 1)
self.textbox = curses.textpad.Textbox(self.textboxWindow, insert_mode=True)
curses.textpad.rectangle(self.screen, self.height-3, 0, self.height-1, self.width-24)
self.textboxWindow.move(0, 0)
def getHost(self):
self.hostWindow = self.screen.subwin(3, 26, self.height/2 - 1, self.width/2 - 13)
self.hostWindow.border(0)
self.hostWindow.addstr(1, 1, "Host: ")
self.hostWindow.refresh()
# Turn on echo and wait for enter key to read buffer
curses.echo()
curses.nocbreak()
self.host = self.hostWindow.getstr(1, 7)
# Turn off echo and disable buffering
curses.cbreak()
curses.noecho()
# Get rid of the host window
self.hostWindow.clear()
self.screen.refresh()
def setStatusWindow(self):
self.statusWindow.clear()
self.statusWindow.border(0)
self.statusWindow.addstr(1, 1, self.client.getHostname())
self.statusWindow.refresh()
def startServer(self):
try:
self.server = Server()
self.server.start(int(self.port))
except exceptions.NetworkError as ne:
CursesDialog(screen, errors.FAILED_TO_START_SERVER, str(ne), isError=True).show()
def showOptionsMenuWindow(self, showStartOption=False):
menuWindow = self.screen.subwin((9 if showStartOption else 8), 40, 3, self.width/2 - 20)
menuWindow.border(0)
# Enable arrow key detection for this window
menuWindow.keypad(True)
pos = 1
while True:
# Disable the cursor
curses.curs_set(0)
while True:
menuItem = 1
if showStartOption:
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Start chat", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuItem += 1
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Show public key fingerprints", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuItem += 1
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Save current keypair", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuItem += 1
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Clear saved keypair", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuItem += 1
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Show help", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuItem += 1
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Close menu", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuItem += 1
menuWindow.addstr(menuItem, 1, str(menuItem) + ".| Quit application", curses.color_pair(4) if pos == menuItem else curses.color_pair(1))
menuWindow.refresh()
key = menuWindow.getch()
if key == curses.KEY_DOWN and pos < (7 if showStartOption else 6):
pos += 1
elif key == curses.KEY_UP and pos > 1:
pos -= 1
# Wrap around from top of menu
elif key == curses.KEY_UP and pos == 1:
pos = (7 if showStartOption else 6)
# Wrap around from bottom of menu
elif key == curses.KEY_DOWN and pos == (7 if showStartOption else 6):
pos = 1
# Enter key
elif key == ord('\n'):
break
# Move the selected item by 1 to adjust for the lack of a start option
if not showStartOption:
pos += 1
# Process the selected option
if pos == 1:
break
if pos == 2:
try:
CursesFingerprintDialog(self.screen, self.crypto.getLocalFingerprint(), self.crypto.getRemoteFingerprint()).show()
except exceptions.CryptoError:
CursesDialog(self.screen, "Public key(s) not generated/received yet.", isBlocking=True).show()
elif pos == 3:
passphrase = self.getKeypairPassphrase(True)
utils.saveKeypair(self.crypto, passphrase)
CursesDialog(self.screen, "This keypair will be used for all subsequent chats", "Keypair Saved", isBlocking=True).show()
elif pos == 4:
utils.clearKeypair()
CursesDialog(self.screen, "Keypair cleared", isBlocking=True).show()
elif pos == 5:
CursesDialog(self.screen, "Read the docs at https://cryptully.readthedocs.org/en/latest/", isBlocking=True).show()
elif pos == 6:
break
elif pos == 7:
os.kill(os.getpid(), signal.SIGINT)
# Shift the selected item position back
if not showStartOption:
pos -= 1
# Re-enable the cursor
curses.curs_set(2)
# Get rid of the accept window
menuWindow.clear()
menuWindow.refresh()
def getKeypairPassphrase(self, verify=False):
passphraseWindow = self.screen.subwin(3, 36, self.height/2 - 1, self.width/2 - 18)
# Turn on echo and wait for enter key to read buffer
curses.echo()
curses.nocbreak()
while True:
passphraseWindow.border(0)
passphraseWindow.addstr(1, 1, "Passphrase: ")
passphraseWindow.refresh()
passphrase = getpass('')
if not verify:
break
passphraseWindow.clear()
passphraseWindow.border(0)
passphraseWindow.addstr(1, 1, "Verify: ")
passphraseWindow.refresh()
verifyPassphrase = getpass('')
if passphrase == verifyPassphrase:
break
else:
curses.cbreak()
CursesDialog(self.screen, errors.VERIFY_PASSPHRASE_FAILED, '', isBlocking=True).show()
curses.nocbreak()
# Turn off echo and disable buffering
curses.cbreak()
curses.noecho()
# Get rid of the passphrase window
passphraseWindow.clear()
passphraseWindow.refresh()
return passphrase
def loadOrGenerateKepair(self):
self.crypto = Crypto()
if utils.doesSavedKeypairExist():
while(True):
passphrase = self.getKeypairPassphrase()
try:
utils.loadKeypair(self.crypto, passphrase)
break
except exceptions.CryptoError:
CursesDialog(self.screen, errors.BAD_PASSPHRASE, '', isBlocking=True).show()
# We still need to generate an AES key
self.crypto.generateAESKey()
else:
self.crypto.generateKeys()
class EncSocket(object):
RSA = 0
AES = 1
def __init__(self, addr, sock=None, crypto=None):
self.addr = addr
self.isEncrypted = False
self.encryptType = None
# Create a new socket if one was not given
if sock is None:
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.isConnected = False
else:
self.sock = sock
self.isConnected = True
# Create a crypto object if one was not given
if crypto is None:
self.crypto = Crypto()
self.crypto.generateKeys()
else:
self.crypto = crypto
def connect(self):
try:
self.sock.connect(self.addr)
self.isConnected = True
except socket.error as se:
raise exceptions.GenericError(str(se))
def disconnect(self):
try:
self.sock.shutdown(socket.SHUT_RDWR)
self.socket.close()
except Exception:
pass
finally:
self.isConnected = False
def send(self, data):
if type(data) is not str:
raise TypeError()
# Encrypt all outgoing data
if self.encryptType is not None:
if self.encryptType == self.RSA:
data = self.crypto.rsaEncrypt(data)
elif self.encryptType == self.AES:
data = self.crypto.aesEncrypt(data)
else:
raise exceptions.ServerError(errors.UNKNOWN_ENCRYPTION_TYPE)
dataLength = len(data)
# Send the length of the message (int converted to network byte order and padded to 32 bytes)
self._send(str('%32s' % socket.htonl(dataLength)), 32)
# Send the actual data
self._send(data, dataLength)
def _send(self, data, length):
sentLen = 0
while sentLen < length:
try:
amountSent = self.sock.send(data[sentLen:])
except socket.error, IOError:
raise exceptions.NetworkError(errors.UNEXPECTED_CLOSE_CONNECTION)
if amountSent == 0:
raise exceptions.NetworkError(errors.UNEXPECTED_CLOSE_CONNECTION)
sentLen += amountSent
