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authentik/passbook/core/models.py

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"""passbook core models"""
from datetime import timedelta
from typing import Any, Optional
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
from django.core.exceptions import ValidationError
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from django.db import models
from django.http import HttpRequest
from django.utils.timezone import now
from django.utils.translation import gettext_lazy as _
from django_prometheus.models import ExportModelOperationsMixin
from guardian.mixins import GuardianUserMixin
from jinja2 import Undefined
from jinja2.exceptions import TemplateSyntaxError, UndefinedError
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
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
from passbook.policies.exceptions import PolicyException
from passbook.policies.types import PolicyRequest, PolicyResult
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LOGGER = get_logger()
NATIVE_ENVIRONMENT = NativeEnvironment()
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def default_token_duration():
"""Default duration a Token is valid"""
return now() + timedelta(minutes=30)
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class Group(ExportModelOperationsMixin("group"), UUIDModel):
"""Custom Group model which supports a basic hierarchy"""
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name = models.CharField(_("name"), max_length=80)
parent = models.ForeignKey(
"Group",
blank=True,
null=True,
on_delete=models.SET_NULL,
related_name="children",
)
attributes = JSONField(default=dict, blank=True)
def __str__(self):
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return f"Group {self.name}"
class Meta:
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unique_together = (("name", "parent",),)
class User(ExportModelOperationsMixin("user"), GuardianUserMixin, AbstractUser):
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"""Custom User model to allow easier adding o f user-based settings"""
uuid = models.UUIDField(default=uuid4, editable=False)
name = models.TextField(help_text=_("User's display name."))
sources = models.ManyToManyField("Source", through="UserSourceConnection")
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groups = models.ManyToManyField("Group")
password_change_date = models.DateTimeField(auto_now_add=True)
attributes = JSONField(default=dict, blank=True)
def set_password(self, password):
if self.pk:
password_changed.send(sender=self, user=self, password=password)
self.password_change_date = now()
return super().set_password(password)
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class Meta:
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permissions = (("reset_user_password", "Reset Password"),)
class Provider(ExportModelOperationsMixin("provider"), models.Model):
"""Application-independent Provider instance. For example SAML2 Remote, OAuth2 Application"""
property_mappings = models.ManyToManyField(
"PropertyMapping", default=None, blank=True
)
objects = InheritanceManager()
# This class defines no field for easier inheritance
def __str__(self):
if hasattr(self, "name"):
return getattr(self, "name")
return super().__str__()
class PolicyModel(UUIDModel, CreatedUpdatedModel):
"""Base model which can have policies applied to it"""
policies = models.ManyToManyField("Policy", blank=True)
class Application(ExportModelOperationsMixin("application"), PolicyModel):
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"""Every Application which uses passbook for authentication/identification/authorization
needs an Application record. Other authentication types can subclass this Model to
add custom fields and other properties"""
name = models.TextField(help_text=_("Application's display Name."))
slug = models.SlugField(help_text=_("Internal application name, used in URLs."))
skip_authorization = models.BooleanField(default=False)
provider = models.OneToOneField(
"Provider", null=True, blank=True, default=None, on_delete=models.SET_DEFAULT
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)
meta_launch_url = models.URLField(default="", blank=True)
meta_icon_url = models.TextField(default="", blank=True)
meta_description = models.TextField(default="", blank=True)
meta_publisher = models.TextField(default="", blank=True)
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objects = InheritanceManager()
def get_provider(self) -> Optional[Provider]:
"""Get casted provider instance"""
if not self.provider:
return None
return Provider.objects.get_subclass(pk=self.provider.pk)
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def __str__(self):
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"""
name = models.TextField(help_text=_("Source's display Name."))
slug = models.SlugField(help_text=_("Internal source name, used in URLs."))
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enabled = models.BooleanField(default=True)
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property_mappings = models.ManyToManyField(
"PropertyMapping", default=None, blank=True
)
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form = "" # ModelForm-based class ued to create/edit instance
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objects = InheritanceManager()
@property
def ui_login_button(self) -> Optional[UILoginButton]:
"""If source uses a http-based flow, return UI Information about the login
button. If source doesn't use http-based flow, return None."""
return None
@property
def ui_additional_info(self) -> Optional[str]:
"""Return additional Info, such as a callback URL. Show in the administration interface."""
return None
@property
def ui_user_settings(self) -> Optional[UIUserSettings]:
"""Entrypoint to integrate with User settings. Can either return None if no
user settings are available, or an instanace of UIUserSettings."""
return None
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def __str__(self):
return self.name
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class UserSourceConnection(CreatedUpdatedModel):
"""Connection between User and Source."""
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user = models.ForeignKey(User, on_delete=models.CASCADE)
source = models.ForeignKey(Source, on_delete=models.CASCADE)
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class Meta:
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unique_together = (("user", "source"),)
class Policy(ExportModelOperationsMixin("policy"), UUIDModel, CreatedUpdatedModel):
"""Policies which specify if a user is authorized to use an Application. Can be overridden by
other types to add other fields, more logic, etc."""
name = models.TextField(blank=True, null=True)
negate = models.BooleanField(default=False)
order = models.IntegerField(default=0)
timeout = models.IntegerField(default=30)
objects = InheritanceManager()
def __str__(self):
return f"Policy {self.name}"
def passes(self, request: PolicyRequest) -> PolicyResult:
"""Check if user instance passes this policy"""
raise PolicyException()
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class Token(ExportModelOperationsMixin("token"), UUIDModel):
"""One-time link for password resets/sign-up-confirmations"""
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expires = models.DateTimeField(default=default_token_duration)
user = models.ForeignKey("User", on_delete=models.CASCADE, related_name="+")
expiring = models.BooleanField(default=True)
description = models.TextField(default="", blank=True)
@property
def is_expired(self) -> bool:
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"""Check if token is expired yet."""
return now() > self.expires
def __str__(self):
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return f"Token f{self.uuid.hex} {self.description} (expires={self.expires})"
class Meta:
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verbose_name = _("Token")
verbose_name_plural = _("Tokens")
class PropertyMapping(UUIDModel):
"""User-defined key -> x mapping which can be used by providers to expose extra data."""
name = models.TextField()
expression = models.TextField()
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form = ""
objects = InheritanceManager()
def evaluate(
self, user: Optional[User], request: Optional[HttpRequest], **kwargs
) -> Any:
"""Evaluate `self.expression` using `**kwargs` as Context."""
try:
expression = NATIVE_ENVIRONMENT.from_string(self.expression)
except TemplateSyntaxError as exc:
raise PropertyMappingExpressionException from exc
try:
response = expression.render(user=user, request=request, **kwargs)
if isinstance(response, Undefined):
raise PropertyMappingExpressionException("Response was 'Undefined'")
return response
except UndefinedError as exc:
raise PropertyMappingExpressionException from exc
def save(self, *args, **kwargs):
try:
NATIVE_ENVIRONMENT.from_string(self.expression)
except TemplateSyntaxError as exc:
raise ValidationError("Expression Syntax Error") from exc
return super().save(*args, **kwargs)
def __str__(self):
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return f"Property Mapping {self.name}"
class Meta:
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verbose_name = _("Property Mapping")
verbose_name_plural = _("Property Mappings")