434 lines
14 KiB
Python
434 lines
14 KiB
Python
"""passbook core models"""
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import re
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from datetime import timedelta
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from logging import getLogger
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from random import SystemRandom
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from time import sleep
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from typing import Tuple, Union
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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 ArrayField
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from django.db import models
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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 as _
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from model_utils.managers import InheritanceManager
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from passbook.core.signals import password_changed
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from passbook.lib.models import CreatedUpdatedModel, UUIDModel
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LOGGER = getLogger(__name__)
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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(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('Group', blank=True, null=True,
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on_delete=models.SET_NULL, related_name='children')
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extra_data = models.TextField(blank=True)
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def __str__(self):
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return "Group %s" % self.name
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class Meta:
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unique_together = (('name', 'parent',),)
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class User(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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applications = models.ManyToManyField('Application')
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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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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 Provider(models.Model):
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"""Application-independent Provider instance. For example SAML2 Remote, OAuth2 Application"""
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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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def passes(self, user: User) -> Union[bool, Tuple[bool, str]]:
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"""Return False, str if a user fails where str is a
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reasons shown to the user. Return True if user succeeds."""
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for policy in self.policies.all():
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if not policy.passes(user):
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return False
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return True
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class 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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def has_user_settings(self):
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"""Entrypoint to integrate with User settings. Can either return False if no
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user settings are available, or a tuple or string, string, string where the first string
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is the name the item has, the second string is the icon and the third is the view-name."""
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return False
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def __str__(self):
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return "Factor %s" % self.slug
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class PasswordFactor(Factor):
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"""Password-based Django-backend Authentication Factor"""
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backends = ArrayField(models.TextField())
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password_policies = models.ManyToManyField('Policy', blank=True)
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type = 'passbook.core.auth.factors.password.PasswordFactor'
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form = 'passbook.core.forms.factors.PasswordFactorForm'
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def has_user_settings(self):
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return _('Change Password'), 'pficon-key', 'passbook_core:user-change-password'
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def password_passes(self, user: User) -> bool:
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"""Return true if user's password passes, otherwise False or raise Exception"""
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for policy in self.policies.all():
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if not policy.passes(user):
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return False
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return True
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def __str__(self):
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return "Password Factor %s" % self.slug
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class Meta:
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verbose_name = _('Password Factor')
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verbose_name_plural = _('Password Factors')
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class DummyFactor(Factor):
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"""Dummy factor, mostly used to debug"""
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type = 'passbook.core.auth.factors.dummy.DummyFactor'
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form = 'passbook.core.forms.factors.DummyFactorForm'
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def __str__(self):
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return "Dummy Factor %s" % self.slug
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class Meta:
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verbose_name = _('Dummy Factor')
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verbose_name_plural = _('Dummy Factors')
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class 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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launch_url = models.URLField(null=True, blank=True)
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icon_url = models.TextField(null=True, blank=True)
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provider = models.OneToOneField('Provider', null=True, blank=True,
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default=None, on_delete=models.SET_DEFAULT)
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skip_authorization = models.BooleanField(default=False)
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objects = InheritanceManager()
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def user_is_authorized(self, user: User) -> bool:
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"""Check if user is authorized to use this application"""
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from passbook.core.policies import PolicyEngine
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return PolicyEngine(self.policies.all()).for_user(user).result
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def get_provider(self):
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"""Get casted provider instance"""
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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(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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form = '' # ModelForm-based class ued to create/edit instance
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enabled = models.BooleanField(default=True)
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objects = InheritanceManager()
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@property
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def is_link(self):
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"""Return true if Source should get a link on the login page"""
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return False
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@property
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def get_login_button(self):
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"""Return a tuple of URL, Icon name and Name"""
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raise NotImplementedError
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@property
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def additional_info(self):
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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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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(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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ACTION_ALLOW = 'allow'
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ACTION_DENY = 'deny'
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ACTIONS = (
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(ACTION_ALLOW, ACTION_ALLOW),
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(ACTION_DENY, ACTION_DENY),
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)
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name = models.TextField(blank=True, null=True)
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action = models.CharField(max_length=20, choices=ACTIONS)
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negate = models.BooleanField(default=False)
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order = models.IntegerField(default=0)
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objects = InheritanceManager()
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def __str__(self):
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if self.name:
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return self.name
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return "%s action %s" % (self.name, self.action)
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def passes(self, user: User) -> Union[bool, Tuple[bool, str]]:
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"""Check if user instance passes this policy"""
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raise NotImplementedError()
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class FieldMatcherPolicy(Policy):
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"""Policy which checks if a field of the User model matches/doesn't match a
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certain pattern"""
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MATCH_STARTSWITH = 'startswith'
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MATCH_ENDSWITH = 'endswith'
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MATCH_CONTAINS = 'contains'
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MATCH_REGEXP = 'regexp'
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MATCH_EXACT = 'exact'
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MATCHES = (
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(MATCH_STARTSWITH, _('Starts with')),
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(MATCH_ENDSWITH, _('Ends with')),
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(MATCH_CONTAINS, _('Contains')),
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(MATCH_REGEXP, _('Regexp')),
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(MATCH_EXACT, _('Exact')),
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)
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USER_FIELDS = (
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('username', _('Username'),),
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('name', _('Name'),),
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('email', _('E-Mail'),),
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('is_staff', _('Is staff'),),
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('is_active', _('Is active'),),
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('data_joined', _('Date joined'),),
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)
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user_field = models.TextField(choices=USER_FIELDS)
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match_action = models.CharField(max_length=50, choices=MATCHES)
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value = models.TextField()
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form = 'passbook.core.forms.policies.FieldMatcherPolicyForm'
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def __str__(self):
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description = "%s, user.%s %s '%s'" % (self.name, self.user_field,
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self.match_action, self.value)
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if self.name:
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description = "%s: %s" % (self.name, description)
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return description
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def passes(self, user: User) -> Union[bool, Tuple[bool, str]]:
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"""Check if user instance passes this role"""
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if not hasattr(user, self.user_field):
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raise ValueError("Field does not exist")
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user_field_value = getattr(user, self.user_field, None)
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LOGGER.debug("Checked '%s' %s with '%s'...",
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user_field_value, self.match_action, self.value)
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passes = False
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if self.match_action == FieldMatcherPolicy.MATCH_STARTSWITH:
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passes = user_field_value.startswith(self.value)
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if self.match_action == FieldMatcherPolicy.MATCH_ENDSWITH:
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passes = user_field_value.endswith(self.value)
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if self.match_action == FieldMatcherPolicy.MATCH_CONTAINS:
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passes = self.value in user_field_value
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if self.match_action == FieldMatcherPolicy.MATCH_REGEXP:
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pattern = re.compile(self.value)
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passes = bool(pattern.match(user_field_value))
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if self.negate:
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passes = not passes
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LOGGER.debug("User got '%r'", passes)
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return passes
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class Meta:
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verbose_name = _('Field matcher Policy')
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verbose_name_plural = _('Field matcher Policies')
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class PasswordPolicy(Policy):
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"""Policy to make sure passwords have certain properties"""
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amount_uppercase = models.IntegerField(default=0)
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amount_lowercase = models.IntegerField(default=0)
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amount_symbols = models.IntegerField(default=0)
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length_min = models.IntegerField(default=0)
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symbol_charset = models.TextField(default=r"!\"#$%&'()*+,-./:;<=>?@[\]^_`{|}~ ")
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error_message = models.TextField()
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form = 'passbook.core.forms.policies.PasswordPolicyForm'
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def passes(self, user: User) -> Union[bool, Tuple[bool, str]]:
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# Only check if password is being set
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if not hasattr(user, '__password__'):
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return True
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password = getattr(user, '__password__')
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filter_regex = r''
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if self.amount_lowercase > 0:
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filter_regex += r'[a-z]{%d,}' % self.amount_lowercase
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if self.amount_uppercase > 0:
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filter_regex += r'[A-Z]{%d,}' % self.amount_uppercase
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if self.amount_symbols > 0:
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filter_regex += r'[%s]{%d,}' % (self.symbol_charset, self.amount_symbols)
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result = bool(re.compile(filter_regex).match(password))
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LOGGER.debug("User got %r", result)
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if not result:
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return result, self.error_message
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return result
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class Meta:
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verbose_name = _('Password Policy')
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verbose_name_plural = _('Password Policies')
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class WebhookPolicy(Policy):
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"""Policy that asks webhook"""
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METHOD_GET = 'GET'
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METHOD_POST = 'POST'
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METHOD_PATCH = 'PATCH'
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METHOD_DELETE = 'DELETE'
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METHOD_PUT = 'PUT'
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METHODS = (
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(METHOD_GET, METHOD_GET),
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(METHOD_POST, METHOD_POST),
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(METHOD_PATCH, METHOD_PATCH),
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(METHOD_DELETE, METHOD_DELETE),
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(METHOD_PUT, METHOD_PUT),
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)
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url = models.URLField()
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method = models.CharField(max_length=10, choices=METHODS)
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json_body = models.TextField()
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json_headers = models.TextField()
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result_jsonpath = models.TextField()
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result_json_value = models.TextField()
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form = 'passbook.core.forms.policies.WebhookPolicyForm'
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def passes(self, user: User):
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"""Call webhook asynchronously and report back"""
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raise NotImplementedError()
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class Meta:
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verbose_name = _('Webhook Policy')
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verbose_name_plural = _('Webhook Policies')
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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, user: User):
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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 '%s' waiting for %ds", self.name, wait)
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sleep(wait)
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return 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(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 reverse_lazy('passbook_core:auth-sign-up') + '?invitation=%s' % self.uuid
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def __str__(self):
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return "Invitation %s created by %s" % (self.uuid, 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(UUIDModel):
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"""One-time link for password resets/signup-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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def __str__(self):
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return "Nonce %s (expires=%s)" % (self.uuid.hex, 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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