mirror of
https://gitlab2.federez.net/re2o/re2o
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114 lines
3.8 KiB
Python
114 lines
3.8 KiB
Python
# coding:utf-8
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# Re2o est un logiciel d'administration développé initiallement au Rézo Metz. Il
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# se veut agnostique au réseau considéré, de manière à être installable en
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# quelques clics.
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#
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# Copyright © 2017 Gabriel Détraz
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# Copyright © 2017 Lara Kermarec
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# Copyright © 2017 Augustin Lemesle
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# Copyright © 2018 Maël Kervella
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# Copyright © 2018 Hugo Levy-Falk
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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Module defining a AESEncryptedField object that can be used in forms
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to handle the use of properly encrypting and decrypting AES keys
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"""
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import string
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import binascii
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from random import choice
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from Crypto.Cipher import AES
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from django.db import models
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from django import forms
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from django.conf import settings
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EOD_asbyte = b"`%EofD%`" # This should be something that will not occur in strings
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EOD = EOD_asbyte.decode("utf-8")
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def genstring(length=16, chars=string.printable):
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""" Generate a random string of length `length` and composed of
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the characters in `chars` """
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return "".join([choice(chars) for i in range(length)])
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def encrypt(key, secret):
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""" AES Encrypt a secret with the key `key` """
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obj = AES.new(key)
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datalength = len(secret) + len(EOD)
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if datalength < 16:
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saltlength = 16 - datalength
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else:
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saltlength = 16 - datalength % 16
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encrypted_secret = "".join([secret, EOD, genstring(saltlength)])
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return obj.encrypt(encrypted_secret)
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def decrypt(key, secret):
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""" AES Decrypt a secret with the key `key` """
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obj = AES.new(key)
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uncrypted_secret = obj.decrypt(secret)
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return uncrypted_secret.split(EOD_asbyte)[0]
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class AESEncryptedFormField(forms.CharField):
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widget = forms.PasswordInput(render_value=True)
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class AESEncryptedField(models.CharField):
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""" A Field that can be used in forms for adding the support
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of AES ecnrypted fields """
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def save_form_data(self, instance, data):
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setattr(
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instance,
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self.name,
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binascii.b2a_base64(encrypt(settings.AES_KEY, data)).decode("utf-8"),
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)
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def to_python(self, value):
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if value is None:
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return None
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try:
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return decrypt(settings.AES_KEY, binascii.a2b_base64(value)).decode("utf-8")
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except UnicodeDecodeError as e:
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raise ValueError(
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"Could not decode your field %s, your settings.AES_KEY "
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"is probably wrong." % self.name
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)
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def from_db_value(self, value, *args, **kwargs):
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if value is None:
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return value
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try:
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return decrypt(settings.AES_KEY, binascii.a2b_base64(value)).decode("utf-8")
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except UnicodeDecodeError as e:
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raise ValueError(
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"Could not decode your field %s, your settings.AES_KEY "
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"is probably wrong." % self.name
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)
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def get_prep_value(self, value):
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if value is None:
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return value
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return binascii.b2a_base64(encrypt(settings.AES_KEY, value)).decode("utf-8")
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def formfield(self, **kwargs):
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defaults = {"form_class": AESEncryptedFormField}
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defaults.update(kwargs)
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return super().formfield(**defaults)
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