Removed backend because it wasn't used in encryption.accounts

src/bot/message_handlers.py

@@ -58,21 +58,31 @@ async def get_accounts(
 
 async def delete_all(bot: AsyncTeleBot, engine: Engine, mes: Message) -> None:
     await base_handler(bot, mes)
+    master_pass = db.get.get_master_pass(engine, mes.from_user.id)
+    if master_pass is None:
+        await send_tmp_message(bot, mes.chat.id, "У вас нет мастер пароля")
+        return
     bot_mes = await bot.send_message(
         mes.chat.id,
         "Вы действительно хотите удалить все ваши аккаунты? Это действие "
         "нельзя отменить. "
-        "Отправьте YES для подтверждения",
+        "Отправьте мастер пароль для подтверждения",
+    )
+    register_state(
+        mes, functools.partial(_delete_all2, bot, engine, master_pass, bot_mes)
     )
-    register_state(mes, functools.partial(_delete_all2, bot, engine, bot_mes))
 
 
 async def _delete_all2(
-    bot: AsyncTeleBot, engine: Engine, prev_mes: Message, mes: Message
+    bot: AsyncTeleBot,
+    engine: Engine,
+    master_pass: db.models.MasterPass,
+    prev_mes: Message,
+    mes: Message,
 ) -> None:
     await base_handler(bot, mes, prev_mes)
     text = mes.text.strip()
-    if text == "YES":
+    if encryption.master_pass.check_master_pass(text, master_pass):
         db.delete.purge_accounts(engine, mes.from_user.id)
         db.delete.delete_master_pass(engine, mes.from_user.id)
         await send_tmp_message(
@@ -85,7 +95,7 @@ async def _delete_all2(
         await send_tmp_message(
             bot,
             mes.chat.id,
-            "Вы отправили не YES, ничего не удалено",
+            "Вы отправили не верный мастер пароль, ничего не удалено",
         )
 
 
@@ -134,7 +144,8 @@ async def reset_master_pass(
 ) -> None:
     await base_handler(bot, mes)
 
-    if db.get.get_master_pass(engine, mes.from_user.id) is None:
+    master_pass = db.get.get_master_pass(engine, mes.from_user.id)
+    if master_pass is None:
         return await send_tmp_message(
             bot,
             mes.chat.id,
@@ -143,17 +154,48 @@ async def reset_master_pass(
 
     bot_mes = await bot.send_message(
         mes.chat.id,
-        "Отправьте новый мастер пароль, осторожно, все текущие аккаунты "
+        "Отправьте текущий мастер пароль",
-        "будут удалены навсегда",
     )
 
     register_state(
         mes,
-        functools.partial(_reset_master_pass2, bot, engine, bot_mes),
+        functools.partial(
+            _reset_master_pass2,
+            bot,
+            engine,
+            master_pass,
+            bot_mes,
+        ),
     )
 
 
 async def _reset_master_pass2(
+    bot: AsyncTeleBot,
+    engine: Engine,
+    master_pass: db.models.MasterPass,
+    prev_mes: Message,
+    mes: Message,
+) -> None:
+    await base_handler(bot, mes, prev_mes)
+    text = mes.text.strip()
+    if text == "/cancel":
+        await send_tmp_message(bot, mes.chat.id, "Успешная отмена")
+
+    if not encryption.master_pass.check_master_pass(text, master_pass):
+        await send_tmp_message(bot, mes.chat.id, "Неверный мастер пароль")
+        return
+
+    bot_mes = await bot.send_message(
+        mes.chat.id,
+        "Отправьте новый мастер пароль. Осторожно, все аккаунты будут удалены",
+    )
+    register_state(
+        mes,
+        functools.partial(_reset_master_pass3, bot, engine, bot_mes),
+    )
+
+
+async def _reset_master_pass3(
     bot: AsyncTeleBot, engine: Engine, prev_mes: Message, mes: Message
 ) -> None:
     await base_handler(bot, mes, prev_mes)
@@ -428,13 +470,14 @@ async def delete_account(
 
     register_state(
         mes,
-        functools.partial(_delete_account2, bot, engine, bot_mes),
+        functools.partial(_delete_account2, bot, engine, master_pass, bot_mes),
     )
 
 
 async def _delete_account2(
     bot: AsyncTeleBot,
     engine: Engine,
+    master_pass: db.models.MasterPass,
     prev_mes: Message,
     mes: Message,
 ):
@@ -448,27 +491,36 @@ async def _delete_account2(
 
     bot_mes = await bot.send_message(
         mes.from_user.id,
-        f'Вы уверены, что хотите удалить аккаунт "{text}"?\nОтправьте YES для '
+        f'Вы уверены, что хотите удалить аккаунт "{text}"?\nОтправьте мастер '
-        "подтверждения",
+        "пароль для подтверждения",
     )
 
     register_state(
         mes,
-        functools.partial(_delete_account3, bot, engine, bot_mes, text),
+        functools.partial(
+            _delete_account3,
+            bot,
+            engine,
+            master_pass,
+            bot_mes,
+            text,
+        ),
     )
 
 
 async def _delete_account3(
     bot: AsyncTeleBot,
     engine: Engine,
+    master_pass: db.models.MasterPass,
     prev_mes: Message,
     account_name: str,
     mes: Message,
 ) -> None:
     await base_handler(bot, mes, prev_mes)
     text = mes.text.strip()
-    if text != "YES":
+    if not encryption.master_pass.check_master_pass(text, master_pass):
-        return await send_tmp_message(bot, mes.chat.id, "Успешная отмена")
+        await send_tmp_message(bot, mes.chat.id, "Неверный пароль")
+        return
 
     db.delete.delete_account(engine, mes.from_user.id, account_name)
     await send_tmp_message(bot, mes.chat.id, "Аккаунт удалён")
@@ -697,4 +749,13 @@ async def message_handler(bot: AsyncTeleBot, mes: Message) -> None:
             "Вы отправили не корректное сообщение",
         )
         return
+
+    try:
         await handler(mes)
+    except Exception:
+        await send_tmp_message(
+            bot,
+            mes.chat.id,
+            "Произошла непредвиденная ошибка",
+        )
+        raise

src/encryption/accounts.py

@@ -1,26 +1,43 @@
-import base64
 import os
+from typing import Self
 
-from cryptography.fernet import Fernet
-from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
 from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
 
 from ..db.models import Account
 from ..decrypted_account import DecryptedAccount
 
 
-def _generate_key(salt: bytes, master_pass: bytes) -> bytes:
+class Cipher:
-    """Generates key for fernet encryption"""
+    def __init__(self, key: bytes) -> None:
+        self._chacha = ChaCha20Poly1305(key)
+
+    @classmethod
+    def generate_cipher(cls, salt: bytes, password: bytes) -> Self:
+        """Generates cipher which uses key derived from a given password"""
         kdf = PBKDF2HMAC(
             algorithm=hashes.SHA256(),
             length=32,
             salt=salt,
             iterations=100000,
-        backend=default_backend(),
         )
-    key = base64.urlsafe_b64encode(kdf.derive(master_pass))
+        return cls(kdf.derive(password))
-    return key
+
+    def encrypt(self, data: bytes) -> bytes:
+        nonce = os.urandom(12)
+        return nonce + self._chacha.encrypt(
+            nonce,
+            data,
+            associated_data=None,
+        )
+
+    def decrypt(self, data: bytes) -> bytes:
+        return self._chacha.decrypt(
+            nonce=data[:12],
+            data=data[12:],
+            associated_data=None,
+        )
 
 
 def encrypt(
@@ -29,15 +46,10 @@ def encrypt(
 ) -> Account:
     """Encrypts account using master password and returns Account object"""
     salt = os.urandom(64)
-    key = _generate_key(salt, master_pass.encode("utf-8"))
+    cipher = Cipher.generate_cipher(salt, master_pass.encode("utf-8"))
-    f = Fernet(key)
 
-    enc_login = base64.urlsafe_b64decode(
+    enc_login = cipher.encrypt(account.login.encode("utf-8"))
-        f.encrypt(account.login.encode("utf-8")),
+    enc_password = cipher.encrypt(account.password.encode("utf-8"))
-    )
-    enc_password = base64.urlsafe_b64decode(
-        f.encrypt(account.password.encode("utf-8")),
-    )
 
     return Account(
         user_id=account.user_id,
@@ -54,15 +66,10 @@ def decrypt(
 ) -> DecryptedAccount:
     """Decrypts account using master password and returns
     DecryptedAccount object"""
-    key = _generate_key(account.salt, master_pass.encode("utf-8"))
+    cipher = Cipher.generate_cipher(account.salt, master_pass.encode("utf-8"))
-    f = Fernet(key)
 
-    login = f.decrypt(
+    login = cipher.decrypt(account.enc_login).decode("utf-8")
-        base64.urlsafe_b64encode(account.enc_login),
+    password = cipher.decrypt(account.enc_password).decode("utf-8")
-    ).decode("utf-8")
-    password = f.decrypt(
-        base64.urlsafe_b64encode(account.enc_password),
-    ).decode("utf-8")
 
     return DecryptedAccount(
         user_id=account.user_id,