Система авторизации пользователя по собственной модели

class Account(models.Model):
    provider = models.ForeignKey('Provider', models.DO_NOTHING)
    login = models.CharField(max_length=255, blank=True, null=True)
    fullname = models.CharField(max_length=255)
    password = models.CharField(max_length=32, blank=True, null=True)
    can_autodisable = models.BooleanField()
    contract_info = models.CharField(max_length=255, blank=True, null=True)
    main_address = models.CharField(max_length=255, blank=True, null=True)
    account_desc = models.TextField(blank=True, null=True)
    device_count_limit = models.IntegerField(blank=True, null=True)
    enabled = models.BooleanField()
    remote_custom_field = models.CharField(max_length=255, blank=True, null=True)
    m3u_allowed = models.BooleanField()
    provisioning_scheme = models.ForeignKey('ProvisioningScheme', models.DO_NOTHING, blank=True, null=True)
    region_tag = models.ForeignKey('RegionTag', models.DO_NOTHING, blank=True, null=True)

def login_view(request):
 
        username = 'lego'
        password = '123123321'
        pers = Account.objects.get(login=username)
        hash=pers.password# получаем хэш из базы
 
        user = authenticate(login=username,password=password,hash=hash)
        print(user)

from django.contrib.auth.models import AbstractBaseUser
import hashlib
from django.contrib.auth import authenticate
from django.conf import settings
from .models import *
 
class HashBackend(object):
    def authenticate(self, login=None, password=None, hash=None):
        md5 = hashlib.md5()
        md5.update(password)
        print(md5.digest)
        try:
            user = Account.objects.get(login=login)
            if hash == md5.digest():
               user.is_active = True
               return user
            else:
        # Authentication fails if None is returned
               return None
 
        except Account.DoesNotExist:
             return None
 
    def get_user(self, user_id):
            try:
                return Account.objects.get(pk=user_id)
            except Account.DoesNotExist:
                return None

class Account(models.Model):
    provider = models.ForeignKey('Provider', models.DO_NOTHING)
    login = models.CharField(max_length=255, blank=True, null=True)
    fullname = models.CharField(max_length=255)
    password = models.CharField(max_length=32, blank=True, null=True)
    can_autodisable = models.BooleanField()
    contract_info = models.CharField(max_length=255, blank=True, null=True)
    main_address = models.CharField(max_length=255, blank=True, null=True)
    account_desc = models.TextField(blank=True, null=True)
    device_count_limit = models.IntegerField(blank=True, null=True)
    enabled = models.BooleanField()
    remote_custom_field = models.CharField(max_length=255, blank=True, null=True)
    m3u_allowed = models.BooleanField()
    provisioning_scheme = models.ForeignKey('ProvisioningScheme', models.DO_NOTHING, blank=True, null=True)
    region_tag = models.ForeignKey('RegionTag', models.DO_NOTHING, blank=True, null=True)
 
    # A unique constraint could not be introspected.
    class Meta:
        managed = False
        db_table = 'account'