340 lines
11 KiB
Python
340 lines
11 KiB
Python
"""passbook core models"""
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from datetime import timedelta
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from typing import Any, Optional, Type
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from uuid import uuid4
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from django.contrib.auth.models import AbstractUser
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from django.contrib.auth.models import UserManager as DjangoUserManager
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from django.db import models
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from django.db.models import Q, QuerySet
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from django.forms import ModelForm
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from django.http import HttpRequest
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from django.utils.timezone import now
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from django.utils.translation import gettext_lazy as _
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from guardian.mixins import GuardianUserMixin
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from model_utils.managers import InheritanceManager
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from structlog import get_logger
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from passbook.core.exceptions import PropertyMappingExpressionException
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from passbook.core.signals import password_changed
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from passbook.core.types import UILoginButton, UIUserSettings
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from passbook.flows.models import Flow
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from passbook.lib.models import CreatedUpdatedModel
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from passbook.policies.models import PolicyBindingModel
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LOGGER = get_logger()
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PASSBOOK_USER_DEBUG = "passbook_user_debug"
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def default_token_duration():
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"""Default duration a Token is valid"""
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return now() + timedelta(minutes=30)
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class Group(models.Model):
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"""Custom Group model which supports a basic hierarchy"""
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group_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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name = models.CharField(_("name"), max_length=80)
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is_superuser = models.BooleanField(
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default=False, help_text=_("Users added to this group will be superusers.")
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)
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parent = models.ForeignKey(
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"Group",
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blank=True,
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null=True,
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on_delete=models.SET_NULL,
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related_name="children",
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)
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attributes = models.JSONField(default=dict, blank=True)
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def __str__(self):
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return f"Group {self.name}"
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class Meta:
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unique_together = (("name", "parent",),)
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class UserManager(DjangoUserManager):
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"""Custom user manager that doesn't assign is_superuser and is_staff"""
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def create_user(self, username, email=None, password=None, **extra_fields):
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"""Custom user manager that doesn't assign is_superuser and is_staff"""
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return self._create_user(username, email, password, **extra_fields)
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class User(GuardianUserMixin, AbstractUser):
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"""Custom User model to allow easier adding o f user-based settings"""
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uuid = models.UUIDField(default=uuid4, editable=False)
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name = models.TextField(help_text=_("User's display name."))
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sources = models.ManyToManyField("Source", through="UserSourceConnection")
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pb_groups = models.ManyToManyField("Group", related_name="users")
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password_change_date = models.DateTimeField(auto_now_add=True)
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attributes = models.JSONField(default=dict, blank=True)
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objects = UserManager()
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@property
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def is_superuser(self) -> bool:
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"""Get supseruser status based on membership in a group with superuser status"""
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return self.pb_groups.filter(is_superuser=True).exists()
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@property
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def is_staff(self) -> bool:
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"""superuser == staff user"""
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return self.is_superuser
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def set_password(self, password):
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if self.pk:
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password_changed.send(sender=self, user=self, password=password)
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self.password_change_date = now()
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return super().set_password(password)
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class Meta:
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permissions = (
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("reset_user_password", "Reset Password"),
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("impersonate", "Can impersonate other users"),
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)
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verbose_name = _("User")
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verbose_name_plural = _("Users")
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class Provider(models.Model):
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"""Application-independent Provider instance. For example SAML2 Remote, OAuth2 Application"""
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authorization_flow = models.ForeignKey(
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Flow,
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on_delete=models.CASCADE,
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help_text=_("Flow used when authorizing this provider."),
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related_name="provider_authorization",
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)
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property_mappings = models.ManyToManyField(
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"PropertyMapping", default=None, blank=True
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)
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objects = InheritanceManager()
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@property
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def launch_url(self) -> Optional[str]:
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"""URL to this provider and initiate authorization for the user.
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Can return None for providers that are not URL-based"""
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return None
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def form(self) -> Type[ModelForm]:
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"""Return Form class used to edit this object"""
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raise NotImplementedError
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# This class defines no field for easier inheritance
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def __str__(self):
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if hasattr(self, "name"):
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return getattr(self, "name")
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return super().__str__()
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class Application(PolicyBindingModel):
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"""Every Application which uses passbook for authentication/identification/authorization
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needs an Application record. Other authentication types can subclass this Model to
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add custom fields and other properties"""
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name = models.TextField(help_text=_("Application's display Name."))
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slug = models.SlugField(help_text=_("Internal application name, used in URLs."))
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provider = models.OneToOneField(
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"Provider", null=True, blank=True, default=None, on_delete=models.SET_DEFAULT
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)
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meta_launch_url = models.URLField(default="", blank=True)
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meta_icon_url = models.TextField(default="", blank=True)
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meta_description = models.TextField(default="", blank=True)
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meta_publisher = models.TextField(default="", blank=True)
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def get_launch_url(self) -> Optional[str]:
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"""Get launch URL if set, otherwise attempt to get launch URL based on provider."""
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if self.meta_launch_url:
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return self.meta_launch_url
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if self.provider:
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return self.provider.launch_url
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return None
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def get_provider(self) -> Optional[Provider]:
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"""Get casted provider instance"""
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if not self.provider:
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return None
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return Provider.objects.get_subclass(pk=self.provider.pk)
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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 = _("Application")
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verbose_name_plural = _("Applications")
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class Source(PolicyBindingModel):
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"""Base Authentication source, i.e. an OAuth Provider, SAML Remote or LDAP Server"""
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name = models.TextField(help_text=_("Source's display Name."))
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slug = models.SlugField(
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help_text=_("Internal source name, used in URLs."), unique=True
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)
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enabled = models.BooleanField(default=True)
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property_mappings = models.ManyToManyField(
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"PropertyMapping", default=None, blank=True
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)
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authentication_flow = models.ForeignKey(
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Flow,
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blank=True,
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null=True,
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default=None,
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on_delete=models.SET_NULL,
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help_text=_("Flow to use when authenticating existing users."),
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related_name="source_authentication",
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)
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enrollment_flow = models.ForeignKey(
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Flow,
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blank=True,
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null=True,
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default=None,
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on_delete=models.SET_NULL,
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help_text=_("Flow to use when enrolling new users."),
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related_name="source_enrollment",
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)
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objects = InheritanceManager()
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def form(self) -> Type[ModelForm]:
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"""Return Form class used to edit this object"""
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raise NotImplementedError
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@property
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def ui_login_button(self) -> Optional[UILoginButton]:
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"""If source uses a http-based flow, return UI Information about the login
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button. If source doesn't use http-based flow, return None."""
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return None
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@property
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def ui_additional_info(self) -> Optional[str]:
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"""Return additional Info, such as a callback URL. Show in the administration interface."""
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return None
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@property
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def ui_user_settings(self) -> Optional[UIUserSettings]:
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"""Entrypoint to integrate with User settings. Can either return None if no
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user settings are available, or an instanace of UIUserSettings."""
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return None
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def __str__(self):
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return self.name
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class UserSourceConnection(CreatedUpdatedModel):
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"""Connection between User and Source."""
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user = models.ForeignKey(User, on_delete=models.CASCADE)
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source = models.ForeignKey(Source, on_delete=models.CASCADE)
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class Meta:
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unique_together = (("user", "source"),)
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class ExpiringModel(models.Model):
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"""Base Model which can expire, and is automatically cleaned up."""
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expires = models.DateTimeField(default=default_token_duration)
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expiring = models.BooleanField(default=True)
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@classmethod
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def filter_not_expired(cls, **kwargs) -> QuerySet:
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"""Filer for tokens which are not expired yet or are not expiring,
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and match filters in `kwargs`"""
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query = Q(**kwargs)
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query_not_expired_yet = Q(expires__lt=now(), expiring=True)
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query_not_expiring = Q(expiring=False)
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return cls.objects.filter(query & (query_not_expired_yet | query_not_expiring))
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@property
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def is_expired(self) -> bool:
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"""Check if token is expired yet."""
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return now() > self.expires
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class Meta:
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abstract = True
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class TokenIntents(models.TextChoices):
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"""Intents a Token can be created for."""
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# Single user token
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INTENT_VERIFICATION = "verification"
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# Allow access to API
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INTENT_API = "api"
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class Token(ExpiringModel):
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"""Token used to authenticate the User for API Access or confirm another Stage like Email."""
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token_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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intent = models.TextField(
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choices=TokenIntents.choices, default=TokenIntents.INTENT_VERIFICATION
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)
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user = models.ForeignKey("User", on_delete=models.CASCADE, related_name="+")
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description = models.TextField(default="", blank=True)
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def __str__(self):
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return (
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f"Token {self.token_uuid.hex} {self.description} (expires={self.expires})"
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)
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class Meta:
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verbose_name = _("Token")
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verbose_name_plural = _("Tokens")
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class PropertyMapping(models.Model):
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"""User-defined key -> x mapping which can be used by providers to expose extra data."""
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pm_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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name = models.TextField()
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expression = models.TextField()
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objects = InheritanceManager()
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def form(self) -> Type[ModelForm]:
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"""Return Form class used to edit this object"""
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raise NotImplementedError
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def evaluate(
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self, user: Optional[User], request: Optional[HttpRequest], **kwargs
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) -> Any:
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"""Evaluate `self.expression` using `**kwargs` as Context."""
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from passbook.core.expression import PropertyMappingEvaluator
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evaluator = PropertyMappingEvaluator()
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evaluator.set_context(user, request, **kwargs)
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try:
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return evaluator.evaluate(self.expression)
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except (ValueError, SyntaxError) as exc:
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raise PropertyMappingExpressionException from exc
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def __str__(self):
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return f"Property Mapping {self.name}"
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class Meta:
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verbose_name = _("Property Mapping")
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verbose_name_plural = _("Property Mappings")
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