332 lines
11 KiB
Python
332 lines
11 KiB
Python
"""passbook core models"""
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from datetime import timedelta
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from random import SystemRandom
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from time import sleep
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from typing import Any, Optional
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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.postgres.fields import JSONField
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.http import HttpRequest
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from django.urls import reverse_lazy
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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 django_prometheus.models import ExportModelOperationsMixin
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from guardian.mixins import GuardianUserMixin
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from jinja2 import Undefined
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from jinja2.exceptions import TemplateSyntaxError, UndefinedError
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from jinja2.nativetypes import NativeEnvironment
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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.lib.models import CreatedUpdatedModel, UUIDModel
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from passbook.policies.exceptions import PolicyException
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from passbook.policies.types import PolicyRequest, PolicyResult
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LOGGER = get_logger()
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NATIVE_ENVIRONMENT = NativeEnvironment()
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def default_nonce_duration():
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"""Default duration a Nonce is valid"""
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return now() + timedelta(hours=4)
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class Group(ExportModelOperationsMixin("group"), UUIDModel):
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"""Custom Group model which supports a basic hierarchy"""
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name = models.CharField(_("name"), max_length=80)
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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 = 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 User(ExportModelOperationsMixin("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()
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sources = models.ManyToManyField("Source", through="UserSourceConnection")
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groups = models.ManyToManyField("Group")
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password_change_date = models.DateTimeField(auto_now_add=True)
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attributes = JSONField(default=dict, blank=True)
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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 = (("reset_user_password", "Reset Password"),)
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class Provider(ExportModelOperationsMixin("provider"), models.Model):
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"""Application-independent Provider instance. For example SAML2 Remote, OAuth2 Application"""
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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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# 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 PolicyModel(UUIDModel, CreatedUpdatedModel):
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"""Base model which can have policies applied to it"""
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policies = models.ManyToManyField("Policy", blank=True)
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class Factor(ExportModelOperationsMixin("factor"), PolicyModel):
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"""Authentication factor, multiple instances of the same Factor can be used"""
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name = models.TextField()
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slug = models.SlugField(unique=True)
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order = models.IntegerField()
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enabled = models.BooleanField(default=True)
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objects = InheritanceManager()
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type = ""
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form = ""
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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 f"Factor {self.slug}"
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class Application(ExportModelOperationsMixin("application"), PolicyModel):
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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()
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slug = models.SlugField()
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skip_authorization = models.BooleanField(default=False)
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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(null=True, blank=True)
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meta_icon_url = models.TextField(null=True, blank=True)
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meta_description = models.TextField(null=True, blank=True)
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meta_publisher = models.TextField(null=True, blank=True)
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objects = InheritanceManager()
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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 Source(ExportModelOperationsMixin("source"), PolicyModel):
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"""Base Authentication source, i.e. an OAuth Provider, SAML Remote or LDAP Server"""
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name = models.TextField()
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slug = models.SlugField()
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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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form = "" # ModelForm-based class ued to create/edit instance
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objects = InheritanceManager()
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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 Policy(ExportModelOperationsMixin("policy"), UUIDModel, CreatedUpdatedModel):
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"""Policies which specify if a user is authorized to use an Application. Can be overridden by
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other types to add other fields, more logic, etc."""
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name = models.TextField(blank=True, null=True)
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negate = models.BooleanField(default=False)
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order = models.IntegerField(default=0)
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timeout = models.IntegerField(default=30)
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objects = InheritanceManager()
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def __str__(self):
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return f"Policy {self.name}"
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def passes(self, request: PolicyRequest) -> PolicyResult:
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"""Check if user instance passes this policy"""
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raise PolicyException()
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class DebugPolicy(Policy):
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"""Policy used for debugging the PolicyEngine. Returns a fixed result,
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but takes a random time to process."""
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result = models.BooleanField(default=False)
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wait_min = models.IntegerField(default=5)
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wait_max = models.IntegerField(default=30)
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form = "passbook.core.forms.policies.DebugPolicyForm"
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def passes(self, request: PolicyRequest) -> PolicyResult:
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"""Wait random time then return result"""
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wait = SystemRandom().randrange(self.wait_min, self.wait_max)
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LOGGER.debug("Policy waiting", policy=self, delay=wait)
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sleep(wait)
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return PolicyResult(self.result, "Debugging")
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class Meta:
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verbose_name = _("Debug Policy")
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verbose_name_plural = _("Debug Policies")
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class Invitation(ExportModelOperationsMixin("invitation"), UUIDModel):
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"""Single-use invitation link"""
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created_by = models.ForeignKey("User", on_delete=models.CASCADE)
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expires = models.DateTimeField(default=None, blank=True, null=True)
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fixed_username = models.TextField(blank=True, default=None)
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fixed_email = models.TextField(blank=True, default=None)
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needs_confirmation = models.BooleanField(default=True)
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@property
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def link(self):
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"""Get link to use invitation"""
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return (
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reverse_lazy("passbook_core:auth-sign-up") + f"?invitation={self.uuid.hex}"
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)
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def __str__(self):
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return f"Invitation {self.uuid.hex} created by {self.created_by}"
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class Meta:
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verbose_name = _("Invitation")
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verbose_name_plural = _("Invitations")
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class Nonce(ExportModelOperationsMixin("nonce"), UUIDModel):
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"""One-time link for password resets/sign-up-confirmations"""
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expires = models.DateTimeField(default=default_nonce_duration)
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user = models.ForeignKey("User", on_delete=models.CASCADE)
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expiring = models.BooleanField(default=True)
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description = models.TextField(default="", blank=True)
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@property
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def is_expired(self) -> bool:
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"""Check if nonce is expired yet."""
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return now() > self.expires
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def __str__(self):
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return f"Nonce f{self.uuid.hex} {self.description} (expires={self.expires})"
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class Meta:
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verbose_name = _("Nonce")
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verbose_name_plural = _("Nonces")
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class PropertyMapping(UUIDModel):
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"""User-defined key -> x mapping which can be used by providers to expose extra data."""
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name = models.TextField()
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expression = models.TextField()
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form = ""
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objects = InheritanceManager()
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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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try:
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expression = NATIVE_ENVIRONMENT.from_string(self.expression)
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except TemplateSyntaxError as exc:
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raise PropertyMappingExpressionException from exc
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try:
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response = expression.render(user=user, request=request, **kwargs)
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if isinstance(response, Undefined):
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raise PropertyMappingExpressionException("Response was 'Undefined'")
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return response
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except UndefinedError as exc:
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raise PropertyMappingExpressionException from exc
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def save(self, *args, **kwargs):
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try:
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NATIVE_ENVIRONMENT.from_string(self.expression)
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except TemplateSyntaxError as exc:
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raise ValidationError("Expression Syntax Error") from exc
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return super().save(*args, **kwargs)
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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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