315 lines
9.5 KiB
Python
315 lines
9.5 KiB
Python
import json
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import requests
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import secrets
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import nacl
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import base64
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from nacl import pwhash, secret
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from django.core.cache import cache
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from django.conf import settings
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from django.http import QueryDict
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from django.utils.translation import gettext_lazy as _
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from idhub_auth.models import User
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from django.db import models
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from utils.idhub_ssikit import verify_presentation
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SALT_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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def gen_salt(length: int) -> str:
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"""Generate a random string of SALT_CHARS with specified ``length``."""
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if length <= 0:
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raise ValueError("Salt length must be positive")
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return "".join(secrets.choice(SALT_CHARS) for _ in range(length))
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def set_client_id():
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return gen_salt(24)
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def set_client_secret():
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return gen_salt(48)
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def set_code():
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return gen_salt(24)
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class Organization(models.Model):
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"""
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This class represent a member of one net trust or federated host.
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Client_id and client_secret are the credentials of this organization
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get a connection to my. (receive a request)
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My_client_id and my_client_secret are my credentials than to use if I
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want to connect to this organization. (send a request)
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For use the packages requests we need use my_client_id
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For use in the get or post method of a View, then we need use client_id
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and secret_id.
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main is a field which indicates the organization of this idhub
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"""
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name = models.CharField(max_length=250)
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domain = models.CharField(max_length=250, null=True, default=None)
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main = models.BooleanField(default=False)
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client_id = models.CharField(
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max_length=24,
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default=set_client_id,
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unique=True
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)
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client_secret = models.CharField(
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max_length=48,
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default=set_client_secret
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)
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my_client_id = models.CharField(
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max_length=24,
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)
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my_client_secret = models.CharField(
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max_length=48,
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)
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response_uri = models.URLField(
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help_text=_("Url where to send the verificable presentation"),
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max_length=250
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)
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encrypted_sensitive_data = models.CharField(max_length=255, default=None, null=True)
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salt = models.CharField(max_length=255, default=None, null=True)
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def send(self, vp, code):
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"""
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Send the verificable presentation to Verifier
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"""
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url = "{url}/verify".format(
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url=self.response_uri.strip("/"),
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)
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auth = (self.my_client_id, self.my_client_secret)
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data = {"vp_token": vp}
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if code:
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data["code"] = code
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return requests.post(url, data=data, auth=auth)
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def demand_authorization(self):
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"""
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Send the a request for start a process of Verifier
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"""
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url = "{url}/verify?demand_uri={redirect_uri}".format(
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url=self.response_uri.strip("/"),
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redirect_uri=self.response_uri
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)
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auth = (self.my_client_id, self.my_client_secret)
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return requests.get(url, auth=auth)
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def derive_key_from_password(self, password=None):
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if not password:
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password = cache.get("KEY_DIDS").encode('utf-8')
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kdf = pwhash.argon2i.kdf
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ops = pwhash.argon2i.OPSLIMIT_INTERACTIVE
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mem = pwhash.argon2i.MEMLIMIT_INTERACTIVE
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return kdf(
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secret.SecretBox.KEY_SIZE,
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password,
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self.get_salt(),
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opslimit=ops,
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memlimit=mem
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)
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def decrypt_sensitive_data(self, data=None):
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sb_key = self.derive_key_from_password()
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sb = secret.SecretBox(sb_key)
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if not data:
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data = self.get_encrypted_sensitive_data()
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if not isinstance(data, bytes):
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data = data.encode('utf-8')
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return sb.decrypt(data).decode('utf-8')
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def encrypt_sensitive_data(self, data):
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sb_key = self.derive_key_from_password()
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sb = secret.SecretBox(sb_key)
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if not isinstance(data, bytes):
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data = data.encode('utf-8')
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return base64.b64encode(sb.encrypt(data)).decode('utf-8')
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def get_salt(self):
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if not self.salt:
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return ''
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return base64.b64decode(self.salt.encode('utf-8'))
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def set_salt(self):
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self.salt = base64.b64encode(nacl.utils.random(16)).decode('utf-8')
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def get_encrypted_sensitive_data(self):
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return base64.b64decode(self.encrypted_sensitive_data.encode('utf-8'))
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def set_encrypted_sensitive_data(self):
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key = base64.b64encode(nacl.utils.random(64))
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self.set_salt()
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key_crypted = self.encrypt_sensitive_data(key)
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self.encrypted_sensitive_data = key_crypted
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def encrypt_data(self, data):
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pw = self.decrypt_sensitive_data().encode('utf-8')
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sb = self.get_secret_box(pw)
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value_enc = sb.encrypt(data.encode('utf-8'))
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return base64.b64encode(value_enc).decode('utf-8')
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def decrypt_data(self, data):
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pw = self.decrypt_sensitive_data().encode('utf-8')
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sb = self.get_secret_box(pw)
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value = base64.b64decode(data.encode('utf-8'))
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return sb.decrypt(value).decode('utf-8')
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def get_secret_box(self, password):
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sb_key = self.derive_key_from_password(password=password)
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return secret.SecretBox(sb_key)
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def change_password_key(self, new_password):
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data = self.decrypt_sensitive_data()
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sb_key = self.derive_key_from_password(password=new_password)
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sb = secret.SecretBox(sb_key)
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if not isinstance(data, bytes):
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data = data.encode('utf-8')
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encrypted_data = base64.b64encode(sb.encrypt(data)).decode('utf-8')
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self.encrypted_sensitive_data = encrypted_data
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def __str__(self):
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return self.name
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###################
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# Verifier clases #
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###################
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class Authorization(models.Model):
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"""
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This class represent a query through browser the client to the wallet.
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The Verifier need to do a redirection to the user to Wallet.
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The code we use as a soft foreing key between Authorization and OAuth2VPToken.
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"""
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code = models.CharField(max_length=24, default=set_code)
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code_used = models.BooleanField(default=False)
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created = models.DateTimeField(auto_now=True)
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presentation_definition = models.CharField(max_length=250)
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organization = models.ForeignKey(
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Organization,
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on_delete=models.CASCADE,
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related_name='authorizations',
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null=True,
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)
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user = models.ForeignKey(
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User,
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on_delete=models.CASCADE,
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null=True,
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)
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def authorize(self, path=None):
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data = {
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"response_type": "vp_token",
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"response_mode": "direct_post",
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"client_id": self.organization.my_client_id,
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"presentation_definition": self.presentation_definition,
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"code": self.code,
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"nonce": gen_salt(5),
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}
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query_dict = QueryDict('', mutable=True)
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query_dict.update(data)
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response_uri = self.organization.response_uri.strip("/")
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if path:
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response_uri = "{}/{}".format(response_uri, path.strip("/"))
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url = '{response_uri}/authorize?{params}'.format(
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response_uri=response_uri,
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params=query_dict.urlencode()
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)
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return url
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class OAuth2VPToken(models.Model):
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"""
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This class represent the response of Wallet to Verifier
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and the result of verify.
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"""
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created = models.DateTimeField(auto_now=True)
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result_verify = models.CharField(max_length=255)
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vp_token = models.TextField()
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organization = models.ForeignKey(
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Organization,
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on_delete=models.CASCADE,
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related_name='vp_tokens',
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null=True,
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)
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user = models.ForeignKey(
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User,
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on_delete=models.CASCADE,
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related_name='vp_tokens',
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null=True,
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)
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authorization = models.ForeignKey(
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Authorization,
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on_delete=models.SET_NULL,
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related_name='vp_tokens',
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null=True,
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)
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def __init__(self, *args, **kwargs):
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code = kwargs.pop("code", None)
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super().__init__(*args, **kwargs)
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self.authorization = Authorization.objects.filter(code=code).first()
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def verifing(self):
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self.result_verify = verify_presentation(self.vp_token)
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def get_verifing(self):
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if not self.result_verify:
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return {}
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return json.loads(self.result_verify)
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def get_response_verify(self):
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response = {
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"verify": ',',
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"redirect_uri": "",
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"response": "",
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}
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verification = json.loads(self.result_verify)
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if verification.get('errors') or verification.get('warnings'):
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response["verify"] = "Error, Verification Failed"
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return response
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response["verify"] = "Ok, Verification correct"
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url = self.get_redirect_url()
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if url:
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response["redirect_uri"] = url
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return response
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def get_redirect_url(self):
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if not settings.OIDC_REDIRECT:
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return
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data = {
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"code": self.authorization.code,
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}
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query_dict = QueryDict('', mutable=True)
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query_dict.update(data)
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response_uri = settings.ALLOW_CODE_URI
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url = '{response_uri}?{params}'.format(
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response_uri=response_uri,
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params=query_dict.urlencode()
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)
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return url
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def get_user_info(self):
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tk = json.loads(self.vp_token)
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self.user_info = tk.get(
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"verifiableCredential", [{}]
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)[-1].get("credentialSubject")
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