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| -rw-r--r-- | PY-CHAT.py | 371 | ||||
| -rw-r--r-- | README.md | 45 | ||||
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@@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. 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Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<http://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. diff --git a/PY-CHAT.ico b/PY-CHAT.ico Binary files differnew file mode 100644 index 0000000..f1c4a1b --- /dev/null +++ b/PY-CHAT.ico diff --git a/PY-CHAT.py b/PY-CHAT.py new file mode 100644 index 0000000..063f3f1 --- /dev/null +++ b/PY-CHAT.py @@ -0,0 +1,371 @@ +import subprocess +import threading +import getpass +import base64 +import curses +import queue +import uuid +import sys +import os + +from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC +from cryptography.hazmat.backends import default_backend +from cryptography.hazmat.primitives import hashes +from cryptography.fernet import Fernet + +from typing import Callable +from typing import Dict +from typing import Any + +from protocol import DEFAULT_PORT +from protocol import DEFAULT_ENCODING +from protocol import STRICT_ENCODING_ERRORS +from protocol import LIBERAL_ENCODING_ERRORS +from protocol import Platform +from protocol import AsymmetricSocket + +class Wrap: + + @staticmethod + def quiet_exit(callback: Callable[..., Any]) -> Callable[..., Any]: + def wrapper(*args, **kwargs): + try: + return callback(*args, **kwargs) + except Exception: + sys.exit() + + return wrapper + + @staticmethod + def thread_call(callback: Callable[..., None]) -> Callable[..., None]: + def wrapper(*args, **kwargs): + threading.Thread(target=callback, + args=args, + kwargs=kwargs, + daemon=True).start() + + return wrapper + + @staticmethod + def secure_input(callback: Callable[..., None]) -> Callable[..., Any]: + def wrapper(*args, **kwargs): + try: + return callback(*args, **kwargs) + except (KeyboardInterrupt, EOFError): + sys.exit() + except Exception: + print('Failed creating/joining chatroom, press enter to exit.') + getpass.getpass('') + sys.exit() + + return wrapper + +class Console: + + history = [] + + @classmethod + def init(cls) -> None: + cls.NOTICE = '[NOTICE]' + cls.MAX_USERNAME_LEN = 16 + cls._HR_CHAR = '_' + cls.PRINT_PREFIX = ' ' + cls.INPUT_PREFIX = ' : ' + cls.PRINT_SUFFIX = ': ' + cls.PRINT_PREFIX_LEN = len(cls.PRINT_PREFIX) + cls.INPUT_PREFIX_LEN = len(cls.INPUT_PREFIX) + cls.PRINT_SUFFIX_LEN = len(cls.PRINT_SUFFIX) + cls._SIZE = os.get_terminal_size() + cls.MAX_LINES = cls._SIZE.lines + cls.MAX_COLS = cls._SIZE.columns + cls.PRINT_LINES = cls.MAX_LINES - 4 + cls.INPUT_LINES = cls.MAX_LINES - 2 + cls.WINDOW = curses.initscr() + curses.curs_set(0) + cls.WINDOW.clear() + cls.WINDOW.addstr(cls.PRINT_LINES, 0, cls._HR_CHAR * cls.MAX_COLS) + cls.WINDOW.refresh() + + @staticmethod + def write_msg(obj: Dict[str, Any]) -> None: + username, msg = (obj['username'], obj['msg']) + + Console.history.append((username, msg, (Console.MAX_COLS + - Console.PRINT_PREFIX_LEN + - Console.PRINT_SUFFIX_LEN + - len(username)))) + + if len(Console.history) == Console.PRINT_LINES: + Console.history.pop(0) + + cursor_y, cursor_x = Console.WINDOW.getyx() + + for index, (username, msg, max_msg_len) in enumerate(Console.history, 1): + Console.WINDOW.addstr(index, 0, Console.PRINT_PREFIX) + Console.WINDOW.addstr(index, + Console.PRINT_PREFIX_LEN, + username, + curses.A_UNDERLINE) + Console.WINDOW.addstr(index, + Console.PRINT_PREFIX_LEN + len(username), + Console.PRINT_SUFFIX + msg[:max_msg_len]) + Console.WINDOW.clrtoeol() + + Console.WINDOW.move(cursor_y, cursor_x) + Console.WINDOW.clrtoeol() + Console.WINDOW.refresh() + +class Server: + + def __init__(self, *args, **kwargs) -> None: + self.args = args + self.kwargs = kwargs + self.clients = {} + self.queue = queue.Queue() + self.server = AsymmetricSocket(*self.args, + server_side=True, + is_host=True, + **self.kwargs) + self.server.set_conn() + self.server.set_context() + self.server.set_middleware() + + @Wrap.thread_call + @Wrap.quiet_exit + def listen(self) -> None: + while True: + conn, (ip, port) = self.server.conn.accept() + client = AsymmetricSocket(ip, + port, + conn=conn, + server_side=True, + **self.kwargs) + client.set_context() + id = uuid.uuid4() + self.clients[id] = client + self.pull(id, client) + self.push({'username': Console.NOTICE, + 'msg': 'User Connected'}) + + @Wrap.thread_call + @Wrap.quiet_exit + def pull(self, id: str, client: AsymmetricSocket) -> None: + try: + while True: + obj = client.recv() + + assert isinstance(obj, dict), f'Wrong type: {obj=}' + + msg, username = (obj.get('msg'), obj.get('username')) + + assert isinstance(msg, str), f'Wrong type: {obj=}' + assert isinstance(username, str), f'Wrong type: {obj=}' + + obj['username'] = username[:Console.MAX_USERNAME_LEN] + self.push(obj) + except Exception: + self._disconnect(id) + + def push(self, obj: Dict[str, str]) -> None: + self._employ_workers() + self._create_jobs(obj) + + def _employ_workers(self) -> None: + for _ in self.clients: + self._worker() + + @Wrap.thread_call + @Wrap.quiet_exit + def _worker(self) -> None: + (id, client), obj = self.queue.get() + + try: + client.send(obj) + except Exception: + self._disconnect(id) + finally: + self.queue.task_done() + + def _create_jobs(self, obj: Dict[str, str]) -> None: + for id, client in self.clients.items(): + self.queue.put(((id, client), obj)) + else: + self.queue.join() + + def _disconnect(self, id: str) -> None: + try: + del self.clients[id] + except KeyError: + pass + else: + self.push({'username': Console.NOTICE, + 'msg': 'User Disconnected'}) + finally: + raise + +class Client: + + def __init__(self, *args, **kwargs) -> None: + self.client = AsymmetricSocket(*args, **kwargs) + self.client.set_conn() + self.client.set_middleware() + + @Wrap.thread_call + @Wrap.quiet_exit + def connect(self) -> None: + try: + while True: + obj = self.client.recv() + Console.write_msg(obj) + except Exception: + Console.write_msg({'username': Console.NOTICE, + 'msg': 'You\'ve disconnected, press enter to exit.'}) + raise + + @Wrap.quiet_exit + def send(self, obj: Dict[str, str]) -> None: + self.client.send(obj) + +class Main: + + _SALT = '66a64d07-4b49-4fb4-979c-be60b970f480' + _SALT = _SALT.encode(DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS) + + @Wrap.secure_input + def __init__(self, lines: int, cols: int, theme: str) -> None: + if Platform.WINDOWS: + os.system(f'mode con lines={lines} cols={cols} && color {theme}') + else: + print(f'\x1b[8;{lines};{cols}t', end='', flush=True) + + while True: + category = self._ask('Create/Join Chatroom: ') + category = category.lower() + + if category in ('create', 'join'): + break + + if category == 'create': + address = self._ask('Chatroom Address: ').split(':')[:2] + + if len(address) == 2: + hostname, port = (address[0], int(address[1])) + else: + hostname, port = (address[0], DEFAULT_PORT) + + link_address = input('Chatroom Link Address (Optional Forwarded Port Address): ').split(':')[:2] + + if len(link_address) == 2: + link_hostname, link_port = (link_address[0], int(link_address[1])) + else: + link_hostname, link_port = (hostname, port) + + password = self._ask('Chatroom Password: ', secret=True) + password = password.encode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + + if not os.path.isdir('Certificates'): + os.mkdir('Certificates') + + pubk_filepath = os.path.join('Certificates', 'public_key.pem') + privk_filepath = os.path.join('Certificates', 'private_key.pem') + + try: + subprocess.run(('openssl', + 'req', + '-newkey', + 'rsa:2048', + '-nodes', + '-keyout', + privk_filepath, + '-x509', + '-days', + '36500', + '-out', + pubk_filepath, + '-batch'), + encoding=DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS, + stdin=subprocess.DEVNULL, + stdout=subprocess.DEVNULL, + stderr=subprocess.DEVNULL) + except Exception: + print('\nWARNING: OpenSSL not found in path, falling back on old certificates.', end='') + + with open(pubk_filepath, + 'r', + encoding=DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS) as fh: + pubk_data = fh.read() + + link = f'{link_hostname}:{link_port}@{pubk_data}' + link = link.encode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + link = self._secret(password).encrypt(link) + link = link.decode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + print(f'\nWARNING: Before continuing, save the generated link.\n\n{link}\n') + else: + link = self._ask('Chatroom Link: ') + link = link.encode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + password = self._ask('Chatroom Link Password: ', secret=True) + password = password.encode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + link = self._secret(password).decrypt(link) + link = link.decode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + + address, pubk_data = link.split('@')[:2] + address = address.split(':')[:2] + hostname, port = (address[0], int(address[1])) + + self.username = self._ask('Your Chatroom Username: ') + + if category == 'create': + Server(hostname, port, public_key=pubk_filepath, private_key=privk_filepath).listen() + + Console.init() + + prefix_print_len = (len(self.username) + + Console.PRINT_PREFIX_LEN + + Console.PRINT_SUFFIX_LEN) + prefix_input_len = Console.INPUT_PREFIX_LEN + + if prefix_print_len > prefix_input_len: + max_input_len = prefix_print_len + else: + max_input_len = prefix_input_len + + self.max_input_len = Console.MAX_COLS - max_input_len + self.client = Client(hostname, port, public_key_data=pubk_data) + self.client.connect() + + def _secret(self, password: bytes) -> Fernet: + secret = PBKDF2HMAC(algorithm=hashes.SHA256(), + length=32, + salt=self._SALT, + iterations=320000, + backend=default_backend()) + secret = secret.derive(password) + secret = Fernet(base64.urlsafe_b64encode(secret)) + + return secret + + def _ask(self, question: str='', *, secret: bool=False) -> str: + while True: + if secret: + answer = getpass.getpass(question) + else: + answer = input(question) + + if answer: + return answer + + def run(self) -> None: + while True: + Console.WINDOW.addstr(Console.INPUT_LINES, 0, Console.INPUT_PREFIX) + msg = Console.WINDOW.getstr(Console.INPUT_LINES, + Console.INPUT_PREFIX_LEN, + self.max_input_len) + msg = msg.decode(DEFAULT_ENCODING, errors=LIBERAL_ENCODING_ERRORS) + Console.WINDOW.refresh() + self.client.send({'username': self.username, 'msg': msg}) + +if __name__ == '__main__': + Main(40, 140, '02').run() diff --git a/README.md b/README.md new file mode 100644 index 0000000..677518a --- /dev/null +++ b/README.md @@ -0,0 +1,45 @@ +# PY-CHAT +Create or join a private chatroom without any third-party middlemen in less than 30 seconds, available through an AES encrypted password protected link. + +## Usage +**Creating a chatroom** +1. Enter "create" +2. Enter your address + * **Example:** localhost + * **Example:** localhost:5555 +3. Enter your forwarded port address (optional) + * **Example:** 2.tcp.eu.ngrok.io:18413 +4. Choose your chatroom password (hidden) +5. Save the chatroom link +6. Choose your username + +**Joining a chatroom** +1. Enter "join" +2. Paste the chatroom link +3. Enter the chatroom password (hidden) +4. Choose your username + +## Features +* AES Encrypted Link +* TLS Encrypted Messages +* Forwarded Port Support +* Connect / Disconnect Notices + +--- + +## Requirements +* [Python 3.8+](https://www.python.org/downloads/release/python-380) +* cryptography +* curses + +## Installation +* git clone https://git.alvinhavel.com/PY-CHAT && cd cd PY-CHAT +* **Windows** + * pip install cryptography pyinstaller pipwin && pipwin install curses + * python PY-CHAT.py +* **Mac / Linux** + * pip3 install cryptography curses pyinstaller + * python3 PY-CHAT.py + +## Executable +* pyinstaller -F -i PY-CHAT.ico PY-CHAT.py diff --git a/protocol.py b/protocol.py new file mode 100644 index 0000000..55b8f72 --- /dev/null +++ b/protocol.py @@ -0,0 +1,413 @@ +# Modified Source From: https://git.alvinhavel.com/PY-NET/plain/shared.py + +import ipaddress +import platform +import base64 +import socket +# import uuid +import zlib +import json +import ssl +import re + +from typing import Callable +from typing import Optional +from typing import Union +from typing import Tuple +from typing import Dict +from typing import Any + +DEFAULT_HOSTNAME = 'localhost' +DEFAULT_PORT = 38567 # 38568 +DEFAULT_ENCODING = 'utf-8' +DEFAULT_LANGUAGE_CODE = 65001 +STRICT_ENCODING_ERRORS = 'strict' +LIBERAL_ENCODING_ERRORS = 'replace' + +class Platform: + + PLATFORM = platform.system() + WINDOWS = PLATFORM == 'Windows' + LINUX = PLATFORM == 'Linux' + MAC = PLATFORM == 'Mac' + UNIX = LINUX or MAC + +class ExtendedEncoder(json.JSONEncoder): + + def default(self, obj: Any) -> Any: + if isinstance(obj, bytes): + return base64.b64encode(obj).decode(DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS) + + return json.JSONEncoder.default(self, obj) + +class ExtendedDecoder(json.JSONDecoder): + + def default(self, obj: Any) -> Any: + if isinstance(obj, bytes): + return base64.b64decode(obj.encode(DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS)) + + return json.JSONDecoder.default(self, obj) + +class Bytes: + + LABELS = ('B', 'kB', 'MB', 'GB') + LAST_LABEL = LABELS[-1] + UNIT_STEP = 1024 + UNIT_STEP_THRESH = UNIT_STEP - 0.005 + + @staticmethod + def format(num: Union[int, float]) -> str: + assert isinstance(num, (int, float)), f'Wrong type: {num=}' + assert num >= 0, f'Wrong value: {num=}' + + for unit in Bytes.LABELS: + if num < Bytes.UNIT_STEP_THRESH: + break + + if unit != Bytes.LAST_LABEL: + num /= Bytes.UNIT_STEP + + return f'{num:.2f} {unit}' + +class Socket: + + def __init__( + self, + hostname: str, + port: int, + *, + conn: Optional[Union[socket.socket, ssl.SSLSocket]]=None, + server_side: bool=False, + is_host: bool=False + ) -> None: + assert isinstance(hostname, str), f'Wrong type: {hostname=}' + assert isinstance(port, int), f'Wrong type: {port=}' + assert port >= 1024 and port <= 65535, f'Wrong value: {port=}' + assert isinstance(conn, (socket.socket, ssl.SSLSocket)) or conn is None, f'Wrong type: {conn=}' + assert isinstance(server_side, bool), f'Wrong type: {server_side=}' + assert isinstance(is_host, bool), f'Wrong type: {is_host=}' + + dns_resolved_ip = socket.gethostbyname(hostname) + self.ip = ipaddress.ip_address(dns_resolved_ip) + self.port = port + self.conn = conn + self.server_side = server_side + self.is_host = is_host + + if self.server_side: + self.hostname = hostname if hostname != dns_resolved_ip else None + self.data_wrap = None + self.data_wrap_notes = None + + if self.is_host: + self.in_session = None + self.ENCODING = None + else: + self.in_session = False + else: + assert not self.is_host, f'Wrong value: {self.is_host=}' + + if not self.is_host: + UUID_REGEX = r'^[\da-f]{8}-([\da-f]{4}-){3}[\da-f]{12}$' + self.UUID_PATTERN = re.compile(UUID_REGEX, re.IGNORECASE) + self.ENCODING = DEFAULT_ENCODING + self.DEFAULT_BUFFER_SIZE = self.BUFFER_SIZE = 1024 + self.MAX_BUFFER_SIZE = 65536 + self.SEND_HEADER_SIZE = 10 + self.RECV_HEADER_SIZE = 10 # 46 + + self.header_send_callback = None + self.header_recv_callback = None + self.send_callback = None + self.recv_callback = None + # self.uuid_token = None + + def __enter__(self) -> Union[socket.socket, ssl.SSLSocket]: + assert self.conn, f'Missing attribute: {self.conn=}' + return self.conn + + def __exit__(self, *_) -> None: + self.close() + + def __str__(self) -> str: + if self.server_side: + return f'tcp://{self.ip}:{self.port}' + else: + return super().__str__() + + def address(self) -> Tuple[str, ...]: + assert self.server_side, f'Wrong value: {self.server_side=}' + return (self.data_wrap, self.in_session, str(self), self.hostname, self.ENCODING, self.data_wrap_notes) + + def address_headers(self) -> Tuple[str, ...]: + assert self.server_side, f'Wrong value: {self.server_side=}' + return ('ID', 'Type', 'In Session', 'Address', 'Hostname', 'Encoding', 'Type Notes') + + def detailed_address(self) -> Tuple[Tuple[Tuple[str, Any], ...], Tuple[str, str]]: + assert self.server_side, f'Wrong value: {self.server_side=}' + return ((('Type', self.data_wrap), + ('In Session', self.in_session), + ('Address', str(self)), + ('Hostname', self.hostname), + ('Encoding', self.ENCODING), + ('Type Notes', self.data_wrap_notes), + ('Address Type', f'{self.ip.max_prefixlen}-bit IPv{self.ip.version}'), + ('Reverse Pointer', self.ip.reverse_pointer), + ('Global Address', self.ip.is_global), + ('Link Local Address', self.ip.is_link_local), + ('Loopback Address', self.ip.is_loopback), + ('Multicast Address', self.ip.is_multicast), + ('Private Address', self.ip.is_private), + ('Reserved Address', self.ip.is_reserved), + ('Unspecified Address', self.ip.is_unspecified)), + ('Key', 'Value')) + + def close(self) -> None: + assert self.conn, f'Missing attribute: {self.conn=}' + + try: + self.conn.shutdown(socket.SHUT_RDWR) + except Exception: + pass + finally: + self.conn.close() + + def set_conn(self, **kwargs) -> socket.socket: + if self.server_side: + assert self.is_host, f'Wrong value: {self.is_host=}' + + self.conn = socket.create_server((str(self.ip), self.port), **kwargs) + else: + self.conn = socket.create_connection((str(self.ip), self.port), **kwargs) + + def set_context(self) -> None: + assert self.server_side, f'Wrong value: {self.server_side=}' + + if self.is_host: + self.data_wrap = 'HOSTING :: COMP' + else: + self.data_wrap = 'CONNECTING :: COMP' + + def set_middleware(self) -> None: + assert not self.is_host, f'Wrong value: {self.is_host=}' + + self.send_callback = lambda body: zlib.compress(body) + self.recv_callback = lambda body: zlib.decompress(body) + + def send(self, obj: Dict[str, Any], callback: Callable[[str, str], None]=None) -> None: + assert not self.is_host, f'Wrong value: {self.is_host=}' + assert self.conn, f'Missing attribute: {self.conn=}' + assert isinstance(obj, dict), f'Wrong type: {obj=}' + assert callable(callback) or callback is None, f'Wrong type: {callback=}' + + body = json.dumps(obj, cls=ExtendedEncoder) + body = body.encode(self.ENCODING, errors=LIBERAL_ENCODING_ERRORS) + + if self.send_callback: + body = self.send_callback(body) + + # if self.server_side: + # self.uuid_token = str(uuid.uuid4()) + + body_size = len(body) + header = str(body_size).ljust(self.SEND_HEADER_SIZE) + header = header.encode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + # header = (header + self.uuid_token).encode(DEFAULT_ENCODING, + # errors=STRICT_ENCODING_ERRORS) + + if self.header_send_callback: + header = self.header_send_callback(header) + + if callback: + header_size = len(header) + callback(Bytes.format(header_size), + Bytes.format(body_size), + Bytes.format(header_size + body_size)) + + self.conn.sendall(header + body) + + def recv(self, callback: Callable[[str, str], None]=None) -> Dict[str, Any]: + assert not self.is_host, f'Wrong value: {self.is_host=}' + assert self.conn, f'Missing attribute: {self.conn=}' + assert callable(callback) or callback is None, f'Wrong type: {callback=}' + + position = 0 + + if callback: + history = [] + + if self.BUFFER_SIZE != self.DEFAULT_BUFFER_SIZE: + self.BUFFER_SIZE = self.DEFAULT_BUFFER_SIZE + + while True: + buffer = self.conn.recv(self.BUFFER_SIZE) + + assert buffer, f'Missing attribute: {buffer=}' + + buffer_size = len(buffer) + + if position > 0: + body[position:position + buffer_size] = buffer + position += buffer_size + else: + header = buffer[:self.RECV_HEADER_SIZE] + + if self.header_recv_callback: + header = self.header_recv_callback(header) + + assert isinstance(header, bytes), f'Wrong type: {header=}' + + header = header.decode(DEFAULT_ENCODING, errors=STRICT_ENCODING_ERRORS) + # uuid_token = header[self.SEND_HEADER_SIZE:self.RECV_HEADER_SIZE] + + # assert self.UUID_PATTERN.match(uuid_token), f'Wrong value: {uuid_token=}' + + # if self.server_side: + # assert uuid_token == self.uuid_token, f'Wrong value: {uuid_token} != {self.uuid_token}' + # else: + # self.uuid_token = uuid_token + + body_size = int(header[:self.SEND_HEADER_SIZE]) + + if body_size >= self.MAX_BUFFER_SIZE: + self.BUFFER_SIZE = self.MAX_BUFFER_SIZE + + if callback: + bytes_to_recieve = Bytes.format(body_size + self.RECV_HEADER_SIZE) + + body_buffer_size = buffer_size - self.RECV_HEADER_SIZE + body = bytearray(body_size) + body[:buffer_size] = buffer[self.RECV_HEADER_SIZE:] + position += body_buffer_size + + assert position <= body_size, f'Wrong value: {position} > {body_size}' + + if callback: + history.append((Bytes.format(buffer_size), + Bytes.format(position + self.RECV_HEADER_SIZE), + bytes_to_recieve)) + + if position == body_size: + body = bytes(body) + + if self.recv_callback: + body = self.recv_callback(body) + + assert isinstance(body, bytes), f'Wrong type: {body=}' + + body = body.decode(self.ENCODING, errors=LIBERAL_ENCODING_ERRORS) + body = json.loads(body, cls=ExtendedDecoder) + + assert isinstance(body, dict), f'Wrong type: {body=}' + + if callback: + callback(history) + + return body + +class SymmetricSocket(Socket): + + def __init__( + self, + *args, + password: str=None, + salt: str=None, + **kwargs + ) -> None: + super().__init__(*args, **kwargs) + + assert isinstance(password, str) or password is None, f'Wrong type: {password=}' + assert isinstance(salt, str) or salt is None, f'Wrong type: {salt=}' + + self.password = password + self.salt = salt + + def set_context(self) -> None: + assert self.server_side, f'Wrong value: {self.server_side=}' + + if self.is_host: + self.data_wrap = 'HOSTING :: AES' + self.data_wrap_notes = f'{self.password} :: {self.salt}' + else: + self.data_wrap = 'CONNECTING :: AES' + self.data_wrap_notes = 'AES_128_CBC_PKCS7_HMAC_SHA256' + + def set_middleware(self) -> None: + assert not self.is_host, f'Wrong value: {self.is_host=}' + assert self.password, f'Missing attribute: {self.password=}' + assert self.salt, f'Missing attribute: {self.salt=}' + + from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC + from cryptography.hazmat.backends import default_backend + from cryptography.hazmat.primitives import hashes + from cryptography.fernet import Fernet + + secret = PBKDF2HMAC(algorithm=hashes.SHA256(), + length=32, + salt=self.salt.encode(DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS), + iterations=320000, + backend=default_backend()) + secret = secret.derive(self.password.encode(DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS)) + secret = Fernet(base64.urlsafe_b64encode(secret)) + + recv_header_size = ''.ljust(self.RECV_HEADER_SIZE) + recv_header_size = recv_header_size.encode(DEFAULT_ENCODING, + errors=STRICT_ENCODING_ERRORS) + self.RECV_HEADER_SIZE = len(secret.encrypt(recv_header_size)) + self.header_send_callback = lambda header: secret.encrypt(header) + self.header_recv_callback = lambda header: secret.decrypt(header) + self.send_callback = lambda body: secret.encrypt(zlib.compress(body)) + self.recv_callback = lambda body: zlib.decompress(secret.decrypt(body)) + +class AsymmetricSocket(Socket): + + def __init__( + self, + *args, + public_key: str=None, + private_key: str=None, + public_key_data: str=None, + **kwargs + ) -> None: + super().__init__(*args, **kwargs) + + assert isinstance(public_key, str) or public_key is None, f'Wrong type: {public_key=}' + assert isinstance(private_key, str) or private_key is None, f'Wrong type: {private_key=}' + assert isinstance(public_key_data, str) or public_key_data is None, f'Wrong type: {public_key_data=}' + + self.public_key = public_key + self.private_key = private_key + self.public_key_data = public_key_data + + def set_context(self) -> None: + assert self.server_side, f'Wrong value: {self.server_side=}' + + if self.is_host: + self.data_wrap = 'HOSTING :: TLS' + self.data_wrap_notes = f'{self.public_key} :: {self.private_key}' + else: + self.data_wrap = 'CONNECTING :: TLS' + cipher = self.conn.cipher() + + if cipher: + self.data_wrap_notes = ' :: '.join(cipher[:2]) + + def set_middleware(self) -> None: + if self.server_side: + assert self.is_host, f'Wrong value: {self.is_host=}' + assert self.public_key, f'Missing attribute: {self.public_key=}' + assert self.private_key, f'Missing attribute: {self.private_key=}' + + context = ssl.SSLContext(ssl.PROTOCOL_TLS) + context.load_cert_chain(self.public_key, self.private_key) + self.conn = context.wrap_socket(self.conn, server_side=True) + else: + assert self.public_key_data, f'Missing attribute: {self.public_key_data=}' + + context = ssl.SSLContext(ssl.PROTOCOL_TLS) + context.load_verify_locations(cadata=self.public_key_data) + self.conn = context.wrap_socket(self.conn) |