117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.primitives.kdf.hkdf import HKDF
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from cryptography.hazmat.primitives import hashes, padding
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from cryptography.hazmat.backends import default_backend
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from django.utils.translation import ugettext_lazy as _
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from django.conf import settings
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from django.db import models
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from neluser.models import NelUser
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import secrets
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import uuid
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KEY_LENGTH = 32
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IV_LENGTH = 16
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BLOCK_SIZE = 128
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ENCODING = "UTF-8"
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class SharedPassword(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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name = models.CharField(max_length=512)
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url = models.CharField(max_length=512, blank=True)
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description = models.TextField(blank=True)
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iv = models.BinaryField(max_length=IV_LENGTH)
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encrypted_password = models.BinaryField(max_length=2048)
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@staticmethod
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def get_key(pass_uuid, key=None):
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backend = default_backend()
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hkdf = HKDF(
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algorithm=hashes.SHA256(),
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length=KEY_LENGTH,
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salt=pass_uuid.bytes,
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backend=backend,
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info=None,
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)
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key = key or settings.SECRET_KEY
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key = bytes(key, encoding=ENCODING)
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return hkdf.derive(key)
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@staticmethod
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def get_cipher(key, iv):
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backend = default_backend()
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return Cipher(algorithms.Camellia(key), modes.CBC(iv), backend=backend)
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@staticmethod
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def padd_password(clear_password):
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clear_password = bytes(clear_password, encoding=ENCODING)
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padder = padding.PKCS7(BLOCK_SIZE).padder()
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padded_password = padder.update(clear_password) + padder.finalize()
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return padded_password
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@staticmethod
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def unpadd_password(clear_password):
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unpadder = padding.PKCS7(BLOCK_SIZE).unpadder()
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unpadded_password = unpadder.update(clear_password) + unpadder.finalize()
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return unpadded_password.decode()
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@staticmethod
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def new(name, clear_password):
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password = SharedPassword(
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uuid=uuid.uuid4(),
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name=name,
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url="",
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description="",
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iv=secrets.token_bytes(IV_LENGTH),
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encrypted_password=b"",
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)
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password.set_password(clear_password)
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return password
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def set_password(self, clear_password):
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clear_password = SharedPassword.padd_password(clear_password)
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key = SharedPassword.get_key(self.uuid)
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cipher = SharedPassword.get_cipher(key, self.iv)
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encryptor = cipher.encryptor()
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self.encrypted_password = (
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encryptor.update(clear_password) + encryptor.finalize()
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)
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def decrypt_password(self):
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key = SharedPassword.get_key(self.uuid)
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cipher = SharedPassword.get_cipher(key, self.iv)
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decryptor = cipher.decryptor()
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clear_password = (
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decryptor.update(self.encrypted_password) + decryptor.finalize()
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)
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clear_password = SharedPassword.unpadd_password(clear_password)
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return clear_password
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def users(self):
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lst = (
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SharedPasswordAccess.objects.select_related("user")
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.filter(password=self)
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.order_by("user__email")
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)
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return [e.user for e in lst]
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def __str__(self):
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return self.name
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class Meta:
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verbose_name = _("shared_password")
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verbose_name_plural = _("shared_passwords")
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class SharedPasswordAccess(models.Model):
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user = models.ForeignKey(
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NelUser, on_delete=models.CASCADE, limit_choices_to={"is_staff": True}
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)
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password = models.ForeignKey(SharedPassword, on_delete=models.CASCADE)
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def __str__(self):
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return "{}: {}".format(self.password, self.user)
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class Meta:
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verbose_name = _("shared_password_access")
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verbose_name_plural = _("shared_passwords_access")
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