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Add encryption module

This commit is contained in:
Chris Proctor 2024-05-18 16:09:35 -04:00
parent 533e52f90e
commit 9cfb19e2b4
6 changed files with 505 additions and 0 deletions
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**/__pycache__/*
server/app/migrations
server/database.sqlite

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asgiref = ">=3.7.0,<4"
sqlparse = ">=0.3.1"
tzdata = {version = "*", markers = "sys_platform == \"win32\""}
[package.extras]
argon2 = ["argon2-cffi (>=19.1.0)"]
bcrypt = ["bcrypt"]
[[package]]
name = "django-banjo"
version = "0.5.1"
description = "A simplified abstraction over django for beginners."
optional = false
python-versions = "<4.0,>=3.10"
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django-extensions = ">=3.2.3,<4.0.0"
environ = ">=1.0,<2.0"
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name = "django-extensions"
version = "3.2.3"
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Django = ">=3.2"
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python-versions = "*"
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doc = ["sphinx"]
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lock-version = "2.0"
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2
pyproject.toml
View File

@ -8,6 +8,8 @@ packages = [{include = "lab_subrosa"}]
[tool.poetry.dependencies]
python = "^3.10"
django-banjo = "^0.5.1"
cryptography = "^42.0.7"
[build-system]

22
server/app/models.py Normal file
View File

@ -0,0 +1,22 @@
from banjo.models import (
Model,
StringField,
ForeignKey,
BooleanField,
)
class User(Model):
name = StringField(unique=True)
public_key = StringField(unique=True)
def to_dict(self):
return {
'name': self.name,
'public_key': self.public_key,
}
class Message(Model):
sender = ForeignKey(User, related_name="messages_sent")
recipient = ForeignKey(User, related_name="messages_received")
ciphertext = StringField()
read = BooleanField()

62
server/app/views.py Normal file
View File

@ -0,0 +1,62 @@
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
@route_post("users/new", args={'name': str, 'public_key': str})
def create_user(params):
"Creates a new user"
try:
new_user = User.from_dict(params)
new_user.save()
return new_user.to_dict()
except:
raise NotAllowed("Username and public key must be unique.")
@route_get("users", args={'name': str})
def get_user(params):
"Get a user's public key"
try:
user = User.objects.get(name=params['name'])
return user.to_dict()
except User.DoesNotExist:
raise NotFound(f"There is no user named {params['name']}")
@route_get("messages", args={'name': str})
def get_messages(params):
"Return all the messages for a user"
try:
user = 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)
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})
def send_message(params):
"""Securely sends an encrypted message from `sender` to `recipient`
Sender and recipient should be recognized usernames.
Time sent should be the time the message was sent in isoformat.
Auth should be the time sent, encrypted with the sender's private key.
The ciphertext should be encrypted with the recipient's public key.
"""
try:
sender = User.objects.get(name=params['sender'])
recipient = User.objects.get(name=['recipient'])
except User.DoesNotExist:
raise NotFound(f"There is no user named {params['name']}")
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:
raise NotAllowed(f"The message is too old. Time sent must be within ten seconds")
if not

167
server/encryption.py Normal file
View File

@ -0,0 +1,167 @@
# This module provides higher-level wrappers around cryptography,
# handling intermediate steps and selecting parameters. This module
# also allows users to work with strings instead of bytes, as users
# will not yet have learned about encoding and decoding strings.
# NOTE: DO NOT USE THESE CLASSES IN SERIOUS APPLICATIONS.
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.exceptions import InvalidSignature
from base64 import b64encode, b64decode
from pathlib import Path
PUBLIC_EXPONENT = 65537
KEY_SIZE = 2048
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.
"""
if isinstance(pem, bytes):
key = serialization.load_pem_private_key(pem)
elif isinstance(pem, (str, Path)):
with open(pem, 'rb') as key_file:
key = serialization.load_pem_private_key(
key_file.read(),
password=None
)
else:
raise TypeError("PrivateKey.load requires pem bytes or a file path")
return PrivateKey(key)
@classmethod
def generate(cls):
"Generates a new private key."
key = rsa.generate_private_key(
public_exponent=PUBLIC_EXPONENT,
key_size=KEY_SIZE,
)
return PrivateKey(key)
def __init__(self, key):
if not isinstance(key, rsa.RSAPrivateKey):
err = (
"PrivateKey is initialized with a rsa.RSAPrivateKey. " +
"You probably want to use PrivateKey.load or PrivateKey.generate instead."
)
raise ValueError(err)
self.key = key
def __str__(self):
"Returns a string representation of the key in PEM format"
return self.key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption()
).decode('utf8')
def __repr__(self):
return "<PrivateKey>"
def save(self, filepath):
"Saves the key as a pem file"
Path(filepath).write_text(str(self))
def get_public_key(self):
"Gets the matching public key."
return PublicKey(self.key.public_key())
def sign(self, message):
"""Create an encrypted signature of the message.
Anyone with the public key can verify that the signer had the matching
private key.
"""
message_bytes = message.encode('utf8')
signature = self.key.sign(
message_bytes,
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
hashes.SHA256()
)
return b64encode(signature).decode('ascii')
def decrypt(self, ciphertext):
"""Decrypts a message encrypted with the matching PublicKey.
"""
ciphertext_bytes = b64decode(ciphertext.encode('ascii'))
plaintext = self.key.decrypt(
ciphertext_bytes,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None
)
)
return plaintext.decode('utf8')
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.
"""
if isinstance(pem, bytes):
key = serialization.load_pem_public_key(pem)
elif isinstance(pem, (str, Path)):
with open(pem, 'rb') as key_file:
key = serialization.load_pem_public_key(key_file.read())
else:
raise TypeError("PublicKey.load requires pem bytes or a file path")
return PublicKey(key)
def __init__(self, key):
self.key = key
def __str__(self):
"Returns a string representation of the key in PEM format"
return self.key.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
).decode('utf8')
def __repr__(self):
return "<PublicKey>"
def save(self, filepath):
"""Saves this key to a file in PEM format.
"""
Path(filepath).write_text(str(self))
def verify_signature(self, message, signature):
"""Verifies that `message` was signed using the matching private key.
"""
message_bytes = message.encode('utf8')
signature_bytes = b64decode(signature.encode('ascii'))
self.key.verify(
signature_bytes,
message_bytes,
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.MAX_LENGTH
),
hashes.SHA256()
)
def encrypt(self, message):
"""Encrypts a message so it can be decrypted with the matching PrivateKey.
If encryption fails, your message is probably too long.
"""
message_bytes = message.encode('utf8')
ciphertext = self.key.encrypt(
message_bytes,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None
)
)
return b64encode(ciphertext).decode('ascii')