diff --git a/client/api.py b/client/api.py new file mode 100644 index 0000000..9c402d4 --- /dev/null +++ b/client/api.py @@ -0,0 +1,52 @@ +import requests + +class APIError(Exception): + "A custom error we'll use when something goes wrong with the API" + +class SubRosaAPI: + """An API for the SubRosa server. + """ + + def __init__(self, url): + self.url = url + + def get_user(self, username): + route = "/users" + params = {'name': username} + return self.get(route, params) + + def create_user(self, username, public_key): + route = "/users/new" + params = {'name': username, 'public_key': public_key} + return self.post(route, params) + + def get_messages(self, username): + route = "/messages" + params = {'name': username} + return self.get(route, params) + + def send_message(self, sender, recipient, ciphertext, time_sent, time_sent_signature): + route = "/messages/send" + params = { + 'sender': sender, + 'recipient': recipient, + 'ciphertext': ciphertext, + 'time_sent': time_sent, + 'time_sent_signature': time_sent_signature, + } + return self.get(route, params) + + def get(self, route, params): + response = requests.get(self.url + route, json=params) + if response.ok: + return response.json() + else: + raise APIError(response.json()['error']) + + def post(self, route, params): + response = requests.post(self.url + route, json=params) + if response.ok: + return response.json() + else: + raise APIError(response.json()['error']) + diff --git a/client/user_interface.py b/client/user_interface.py new file mode 100644 index 0000000..806590f --- /dev/null +++ b/client/user_interface.py @@ -0,0 +1,106 @@ +from pathlib import Path +from api import SubRosaAPI, APIError +from datetime import datetime +import sys +sys.path.insert(0, ".") +from encryption import PrivateKey, PublicKey + +class SubRosaUI: + """A user interface to the SubRosa chat system. + """ + def __init__(self, private_key_file, url): + self.api = SubRosaAPI(url) + if Path(private_key_file).exists(): + self.private_key = PrivateKey.load(private_key_file) + else: + self.private_key = PrivateKey.generate() + self.private_key.save(private_key_file) + self.public_key = self.private_key.get_public_key() + + def run(self, username): + self.username = username + self.user = self.get_or_create_user(username) + print("Welcome to SubRosa.") + while True: + choice = self.choose_action_from_menu() + if choice == 'VIEW': + self.show_messages() + elif choice == 'SEND': + self.send_message() + print("=" * 80) + + def get_or_create_user(self, username): + """Gets user info from the server, or creates the user. + If the user already exists, checks that our public key matches + the server's public key for the user. + """ + try: + user = self.api.get_user(username) + if user['public_key'] != str(self.public_key): + raise ValueError(f"Invalid key for {username}") + except APIError: + user = self.api.create_user(username, str(self.public_key)) + return user + + def choose_action_from_menu(self): + """Gets a choice from the user. + """ + print("What would you like to do?") + print("1. See messages") + print("2. Send a message") + while True: + choice = input("> ").strip() + if choice == '1': + return 'VIEW' + elif choice == '2': + return 'SEND' + + def show_messages(self): + messages = self.api.get_messages(self.username)['messages'] + if messages: + for i, message in enumerate(messages): + cleartext = self.private_key.decrypt(message['ciphertext']) + print('-' * 80) + print(f"{i}. From {message['sender']}:") + print(cleartext) + else: + print(f"No messages for {self.username}.") + + def send_message(self): + try: + recipient_name = input("Username of recipient: ").strip() + recipient = self.api.get_user(recipient_name) + except APIError: + print(f"No user named {recipient_name}.") + return + recipient_public_key = PublicKey.load(recipient['public_key']) + plaintext = input("Message: ") + ciphertext = recipient_public_key.encrypt(plaintext) + time_sent = self.get_current_time() + time_sent_signature = self.private_key.sign(time_sent) + self.api.send_message( + self.username, + recipient_name, + ciphertext, + time_sent, + time_sent_signature, + ) + print('-' * 80) + print(f"Message sent to {recipient_name}") + + + def get_current_time(self): + return datetime.utcnow().isoformat() + +def main(): + from argparse import ArgumentParser + parser = ArgumentParser() + parser.add_argument("username") + parser.add_argument("-k", "--key", default="subrosa_private_key.pem") + parser.add_argument("-s", "--server-url", default="http://127.0.0.1:5000") + args = parser.parse_args() + ui = SubRosaUI(args.key, args.server_url) + ui.run(args.username) + +if __name__ == '__main__': + main() diff --git a/encryption.py b/encryption.py index 3679202..f75194f 100644 --- a/encryption.py +++ b/encryption.py @@ -19,11 +19,13 @@ class PrivateKey: @classmethod def load(cls, pem): """Loads an existing private key. - When `pem` is of type bytes, assumes it is a pem serialization. - Otherwise, assumes `pem` is a path to a pem file. + Pem may be a bytes or a string representation of the PEM-formatted key, + or a path to a pem file. """ if isinstance(pem, bytes): - key = serialization.load_pem_private_key(pem) + key = serialization.load_pem_private_key(pem, password=None) + elif isinstance(pem, str) and pem.startswith("-----BEGIN RSA PRIVATE KEY-----"): + key = serialization.load_pem_private_key(pem.encode('ascii'), password=None) elif isinstance(pem, (str, Path)): with open(pem, 'rb') as key_file: key = serialization.load_pem_private_key( @@ -58,7 +60,7 @@ class PrivateKey: encoding=serialization.Encoding.PEM, format=serialization.PrivateFormat.TraditionalOpenSSL, encryption_algorithm=serialization.NoEncryption() - ).decode('utf8') + ).decode('utf8').strip() def __repr__(self): return "" @@ -106,11 +108,13 @@ class PublicKey: @classmethod def load(self, pem): """Loads an existing public key. - When `pem` is of type bytes, assumes it is a pem serialization. - Otherwise, assumes `pem` is a path to a pem file. + Pem may be a bytes or a string representation of the PEM-formatted key, + or a path to a pem file. """ if isinstance(pem, bytes): key = serialization.load_pem_public_key(pem) + elif isinstance(pem, str) and pem.startswith("-----BEGIN PUBLIC KEY-----"): + key = serialization.load_pem_public_key(pem.encode('ascii')) elif isinstance(pem, (str, Path)): with open(pem, 'rb') as key_file: key = serialization.load_pem_public_key(key_file.read()) @@ -126,7 +130,7 @@ class PublicKey: return self.key.public_bytes( encoding=serialization.Encoding.PEM, format=serialization.PublicFormat.SubjectPublicKeyInfo - ).decode('utf8') + ).decode('utf8').strip() def __repr__(self): return "" diff --git a/poetry.lock b/poetry.lock index 26fa93c..756baa4 100644 --- a/poetry.lock +++ b/poetry.lock @@ -17,6 +17,17 @@ typing-extensions = {version = ">=4", markers = "python_version < \"3.11\""} [package.extras] tests = ["mypy (>=0.800)", "pytest", "pytest-asyncio"] +[[package]] +name = "certifi" +version = "2024.2.2" +description = "Python package for providing Mozilla's CA Bundle." +optional = false +python-versions = ">=3.6" +files = [ + {file = "certifi-2024.2.2-py3-none-any.whl", hash = "sha256:dc383c07b76109f368f6106eee2b593b04a011ea4d55f652c6ca24a754d1cdd1"}, + {file = "certifi-2024.2.2.tar.gz", hash = "sha256:0569859f95fc761b18b45ef421b1290a0f65f147e92a1e5eb3e635f9a5e4e66f"}, +] + [[package]] name = "cffi" version = "1.16.0" @@ -81,6 +92,105 @@ files = [ [package.dependencies] pycparser = "*" +[[package]] +name = "charset-normalizer" +version = "3.3.2" +description = "The Real First Universal Charset Detector. 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--- a/server/app/models.py +++ b/server/app/models.py @@ -7,7 +7,7 @@ from banjo.models import ( class User(Model): name = StringField(unique=True) - public_key = StringField(unique=True) + public_key = StringField() def to_dict(self): return { @@ -20,3 +20,10 @@ class Message(Model): recipient = ForeignKey(User, related_name="messages_received") ciphertext = StringField() read = BooleanField() + + def to_dict(self): + return { + 'sender': self.sender.name, + 'recipient': self.recipient.name, + 'ciphertext': self.ciphertext, + } diff --git a/server/app/views.py b/server/app/views.py index 91b97ce..e452a04 100644 --- a/server/app/views.py +++ b/server/app/views.py @@ -2,7 +2,10 @@ from banjo.urls import route_get, route_post from app.models import User, Message from banjo.http import NotFound, NotAllowed from datetime import datetime -import rsa +from cryptography.exceptions import InvalidSignature +import sys +sys.path.insert(0, "..") +from encryption import PrivateKey, PublicKey @route_post("users/new", args={'name': str, 'public_key': str}) def create_user(params): @@ -27,14 +30,14 @@ def get_user(params): def get_messages(params): "Return all the messages for a user" try: - user = User.objects.get(name=params['name']) + recipient = User.objects.get(name=params['name']) except User.DoesNotExist: raise NotFound(f"There is no user named {params['name']}") - messages = Message.objects.filter(user=user) + messages = Message.objects.filter(recipient=recipient) return {'messages': [m.to_dict() for m in messages]} @route_get("messages/send", args={'sender': str, 'recipient': str, 'ciphertext': str, - 'time_sent': str, 'auth': str}) + 'time_sent': str, 'time_sent_signature': str}) def send_message(params): """Securely sends an encrypted message from `sender` to `recipient` Sender and recipient should be recognized usernames. @@ -44,18 +47,28 @@ def send_message(params): """ try: sender = User.objects.get(name=params['sender']) - recipient = User.objects.get(name=['recipient']) + recipient = User.objects.get(name=params['recipient']) except User.DoesNotExist: - raise NotFound(f"There is no user named {params['name']}") + raise NotFound(f"User not found.") try: time_sent = datetime.fromisoformat(params['time_sent']) except ValueError: raise NotAllowed(f"Time sent ({params['time_sent']}) must be in isoformat") - if (datetime.now() - time_sent).seconds > 10: + now = datetime.utcnow() + if (now - time_sent).seconds > 10: raise NotAllowed(f"The message is too old. Time sent must be within ten seconds") - if not - - + sender_public_key = PublicKey.load(sender.public_key) + try: + sender_public_key.verify_signature(params['time_sent'], params['time_sent_signature']) + except InvalidSignature: + raise NotAllowed("Invalid signature.") + message = Message( + sender=sender, + recipient=recipient, + ciphertext=params['ciphertext'], + ) + message.save() + return message.to_dict()