How to generate a user password in plain SQL with Django + PostgreSQL

Question

I want to insert from a Django into another Django database from other domain a proper password text in auth_user table.

I have tried to generate a encrypt function but I don't know how Django generates a password from plain text into hashed password that is stored in database.

postgres_insert_query = """
          INSERT INTO auth_user (username, first_name, last_name, email, password) VALUES (%s,%s,%s,%s,%s)
        """
        record_to_insert = (username, first_name, last_name, email, password)
        cursor.execute(postgres_insert_query, record_to_insert)
        connection.commit()
        cursor.close()

Is there a specific reason why you do not use Django's ORM. It has builtin support for setting passwords. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jul 28, 2019 at 9:48
@WillemVanOnsem Yes, My Django application generates/edits/removes users from another Django application. It is not the case of more than one database in settings.py of the same application. — Ángel Carlos del Pozo Muela
– Ángel Carlos del Pozo Muela, Commented Jul 28, 2019 at 9:50
then it might be better to call the management command to create a user I think, for example with django-createuser. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jul 28, 2019 at 9:51
@WillemVanOnsem This tool is useful for shell scripts in a server to generate users, but my Django application is in one server, and the other Django application where I insert the users is placed in other server. — Ángel Carlos del Pozo Muela
– Ángel Carlos del Pozo Muela, Commented Jul 28, 2019 at 9:53
well the hashing algorithm is not fixed. You can change it by altering the PASSWORD_HASHERS setting: docs.djangoproject.com/en/2.2/topics/auth/passwords/… and therefore even if you manage to get it working, later it might fail, because the settings have changed. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jul 28, 2019 at 9:55

FlipperPA · Accepted Answer · 2019-07-28 22:14:54Z

The set_password method of your User model will allow you to access both the raw password, and the hashed password. Here is an example:

class User(AbstractBaseUser, PermissionsMixin):
    [...fields...]
    def set_password(self, raw_password):
        # Update the password in the current Django Project
        super().set_password(raw_password)

        # Insert the password into the other database
        cursor = connections["otherdb"].cursor()
        postgres_insert_query = """
          INSERT INTO auth_user
          (username, first_name, last_name, email, password)
          VALUES (?, ?, ?, ?, ?)
        """
        cursor.execute(
            postgres_insert_query,
            [self.username, self.first_name, self.last_name, self.email, self.password]
        )
        cursor.close()

In the example, we have access to the raw_password, and after called set_password(), we have access to the hashed password in self.password. This method will be called every time a user is created or modified within the ORM. For example, I've used this method for updating a hashed password in LDAP whenever it is changed in Django, by the end user or an administrator. Good luck!

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