500 lines
16 KiB
Python
500 lines
16 KiB
Python
"""OAuth Provider Models"""
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import base64
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import binascii
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import json
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import time
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from dataclasses import asdict, dataclass, field
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from hashlib import sha256
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from typing import Any, Dict, List, Optional, Type
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from urllib.parse import urlparse
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from uuid import uuid4
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from django.conf import settings
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from django.db import models
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from django.forms import ModelForm
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from django.http import HttpRequest
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from django.shortcuts import reverse
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from django.utils import dateformat, timezone
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from django.utils.translation import gettext_lazy as _
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from jwkest.jwk import Key, RSAKey, SYMKey, import_rsa_key
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from jwkest.jws import JWS
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from passbook.core.models import ExpiringModel, PropertyMapping, Provider, User
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from passbook.crypto.models import CertificateKeyPair
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from passbook.lib.utils.template import render_to_string
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from passbook.lib.utils.time import timedelta_from_string, timedelta_string_validator
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from passbook.providers.oauth2.apps import PassbookProviderOAuth2Config
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from passbook.providers.oauth2.generators import (
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generate_client_id,
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generate_client_secret,
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)
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class ClientTypes(models.TextChoices):
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"""Confidential clients are capable of maintaining the confidentiality
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of their credentials. Public clients are incapable."""
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CONFIDENTIAL = "confidential", _("Confidential")
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PUBLIC = "public", _("Public")
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class GrantTypes(models.TextChoices):
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"""OAuth2 Grant types we support"""
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AUTHORIZATION_CODE = "authorization_code"
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IMPLICIT = "implicit"
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HYBRID = "hybrid"
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class SubModes(models.TextChoices):
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"""Mode after which 'sub' attribute is generateed, for compatibility reasons"""
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HASHED_USER_ID = "hashed_user_id", _("Based on the Hashed User ID")
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USER_USERNAME = "user_username", _("Based on the username")
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USER_EMAIL = (
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"user_email",
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_("Based on the User's Email. This is recommended over the UPN method."),
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)
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USER_UPN = (
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"user_upn",
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_(
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(
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"Based on the User's UPN, only works if user has a 'upn' attribute set. "
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"Use this method only if you have different UPN and Mail domains."
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)
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),
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)
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class ResponseTypes(models.TextChoices):
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"""Response Type required by the client."""
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CODE = "code", _("code (Authorization Code Flow)")
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CODE_ADFS = (
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"code#adfs",
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_("code (ADFS Compatibility Mode, sends id_token as access_token)"),
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)
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ID_TOKEN = "id_token", _("id_token (Implicit Flow)")
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ID_TOKEN_TOKEN = "id_token token", _("id_token token (Implicit Flow)")
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CODE_TOKEN = "code token", _("code token (Hybrid Flow)")
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CODE_ID_TOKEN = "code id_token", _("code id_token (Hybrid Flow)")
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CODE_ID_TOKEN_TOKEN = "code id_token token", _("code id_token token (Hybrid Flow)")
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class JWTAlgorithms(models.TextChoices):
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"""Algorithm used to sign the JWT Token"""
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HS256 = "HS256", _("HS256 (Symmetric Encryption)")
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RS256 = "RS256", _("RS256 (Asymmetric Encryption)")
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class ScopeMapping(PropertyMapping):
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"""Map an OAuth Scope to users properties"""
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scope_name = models.TextField(help_text=_("Scope used by the client"))
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description = models.TextField(
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blank=True,
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help_text=_(
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(
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"Description shown to the user when consenting. "
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"If left empty, the user won't be informed."
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)
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),
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)
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@property
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def form(self) -> Type[ModelForm]:
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from passbook.providers.oauth2.forms import ScopeMappingForm
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return ScopeMappingForm
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def __str__(self):
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return f"Scope Mapping {self.name} ({self.scope_name})"
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class Meta:
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verbose_name = _("Scope Mapping")
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verbose_name_plural = _("Scope Mappings")
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class OAuth2Provider(Provider):
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"""OAuth2 Provider for generic OAuth and OpenID Connect Applications."""
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client_type = models.CharField(
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max_length=30,
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choices=ClientTypes.choices,
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default=ClientTypes.CONFIDENTIAL,
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verbose_name=_("Client Type"),
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help_text=_(ClientTypes.__doc__),
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)
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client_id = models.CharField(
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max_length=255,
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unique=True,
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verbose_name=_("Client ID"),
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default=generate_client_id,
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)
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client_secret = models.CharField(
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max_length=255,
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blank=True,
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verbose_name=_("Client Secret"),
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default=generate_client_secret,
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)
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response_type = models.TextField(
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choices=ResponseTypes.choices,
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default=ResponseTypes.CODE,
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help_text=_(ResponseTypes.__doc__),
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)
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jwt_alg = models.CharField(
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max_length=10,
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choices=JWTAlgorithms.choices,
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default=JWTAlgorithms.RS256,
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verbose_name=_("JWT Algorithm"),
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help_text=_(JWTAlgorithms.__doc__),
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)
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redirect_uris = models.TextField(
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default="",
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verbose_name=_("Redirect URIs"),
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help_text=_("Enter each URI on a new line."),
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)
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include_claims_in_id_token = models.BooleanField(
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default=True,
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verbose_name=_("Include claims in id_token"),
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help_text=_(
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(
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"Include User claims from scopes in the id_token, for applications "
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"that don't access the userinfo endpoint."
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)
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),
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)
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token_validity = models.TextField(
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default="minutes=10",
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validators=[timedelta_string_validator],
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help_text=_(
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(
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"Tokens not valid on or after current time + this value "
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"(Format: hours=1;minutes=2;seconds=3)."
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)
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),
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)
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sub_mode = models.TextField(
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choices=SubModes.choices,
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default=SubModes.HASHED_USER_ID,
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help_text=_(
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(
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"Configure what data should be used as unique User Identifier. For most cases, "
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"the default should be fine."
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)
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),
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)
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rsa_key = models.ForeignKey(
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CertificateKeyPair,
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verbose_name=_("RSA Key"),
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on_delete=models.CASCADE,
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blank=True,
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null=True,
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help_text=_(
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"Key used to sign the tokens. Only required when JWT Algorithm is set to RS256."
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),
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)
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def create_refresh_token(
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self, user: User, scope: List[str], id_token: Optional["IDToken"] = None
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) -> "RefreshToken":
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"""Create and populate a RefreshToken object."""
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token = RefreshToken(
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user=user,
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provider=self,
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access_token=uuid4().hex,
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refresh_token=uuid4().hex,
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expires=timezone.now() + timedelta_from_string(self.token_validity),
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scope=scope,
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)
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if id_token:
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token.id_token = id_token
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return token
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def get_jwt_keys(self) -> List[Key]:
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"""
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Takes a provider and returns the set of keys associated with it.
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Returns a list of keys.
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"""
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if self.jwt_alg == JWTAlgorithms.RS256:
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# if the user selected RS256 but didn't select a
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# CertificateKeyPair, we fall back to HS256
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if not self.rsa_key:
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self.jwt_alg = JWTAlgorithms.HS256
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self.save()
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else:
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# Because the JWT Library uses python cryptodome,
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# we can't directly pass the RSAPublicKey
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# object, but have to load it ourselves
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key = import_rsa_key(self.rsa_key.key_data)
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keys = [RSAKey(key=key, kid=self.rsa_key.kid)]
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if not keys:
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raise Exception("You must add at least one RSA Key.")
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return keys
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if self.jwt_alg == JWTAlgorithms.HS256:
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return [SYMKey(key=self.client_secret, alg=self.jwt_alg)]
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raise Exception("Unsupported key algorithm.")
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def get_issuer(self, request: HttpRequest) -> Optional[str]:
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"""Get issuer, based on request"""
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try:
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mountpoint = PassbookProviderOAuth2Config.mountpoints[
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"passbook.providers.oauth2.urls"
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]
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# pylint: disable=no-member
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return request.build_absolute_uri(f"/{mountpoint}{self.application.slug}/")
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except Provider.application.RelatedObjectDoesNotExist:
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return None
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@property
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def launch_url(self) -> Optional[str]:
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"""Guess launch_url based on first redirect_uri"""
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if self.redirect_uris == "":
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return None
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main_url = self.redirect_uris.split("\n")[0]
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launch_url = urlparse(main_url)
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return main_url.replace(launch_url.path, "")
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@property
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def form(self) -> Type[ModelForm]:
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from passbook.providers.oauth2.forms import OAuth2ProviderForm
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return OAuth2ProviderForm
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def __str__(self):
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return f"OAuth2 Provider {self.name}"
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def encode(self, payload: Dict[str, Any]) -> str:
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"""Represent the ID Token as a JSON Web Token (JWT)."""
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keys = self.get_jwt_keys()
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# If the provider does not have an RSA Key assigned, it was switched to Symmetric
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self.refresh_from_db()
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jws = JWS(payload, alg=self.jwt_alg)
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return jws.sign_compact(keys)
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def html_setup_urls(self, request: HttpRequest) -> Optional[str]:
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"""return template and context modal with URLs for authorize, token, openid-config, etc"""
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try:
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# pylint: disable=no-member
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return render_to_string(
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"providers/oauth2/setup_url_modal.html",
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{
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"provider": self,
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"issuer": self.get_issuer(request),
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"authorize": request.build_absolute_uri(
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reverse(
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"passbook_providers_oauth2:authorize",
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)
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),
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"token": request.build_absolute_uri(
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reverse(
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"passbook_providers_oauth2:token",
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)
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),
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"userinfo": request.build_absolute_uri(
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reverse(
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"passbook_providers_oauth2:userinfo",
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)
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),
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"provider_info": request.build_absolute_uri(
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reverse(
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"passbook_providers_oauth2:provider-info",
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kwargs={"application_slug": self.application.slug},
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)
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),
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},
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)
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except Provider.application.RelatedObjectDoesNotExist:
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return None
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class Meta:
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verbose_name = _("OAuth2/OpenID Provider")
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verbose_name_plural = _("OAuth2/OpenID Providers")
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class BaseGrantModel(models.Model):
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"""Base Model for all grants"""
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provider = models.ForeignKey(OAuth2Provider, on_delete=models.CASCADE)
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user = models.ForeignKey(User, verbose_name=_("User"), on_delete=models.CASCADE)
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_scope = models.TextField(default="", verbose_name=_("Scopes"))
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@property
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def scope(self) -> List[str]:
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"""Return scopes as list of strings"""
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return self._scope.split()
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@scope.setter
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def scope(self, value):
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self._scope = " ".join(value)
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class Meta:
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abstract = True
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class AuthorizationCode(ExpiringModel, BaseGrantModel):
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"""OAuth2 Authorization Code"""
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code = models.CharField(max_length=255, unique=True, verbose_name=_("Code"))
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nonce = models.CharField(
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max_length=255, blank=True, default="", verbose_name=_("Nonce")
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)
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is_open_id = models.BooleanField(
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default=False, verbose_name=_("Is Authentication?")
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)
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code_challenge = models.CharField(
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max_length=255, null=True, verbose_name=_("Code Challenge")
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)
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code_challenge_method = models.CharField(
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max_length=255, null=True, verbose_name=_("Code Challenge Method")
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)
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class Meta:
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verbose_name = _("Authorization Code")
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verbose_name_plural = _("Authorization Codes")
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def __str__(self):
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return "{0} - {1}".format(self.provider, self.code)
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@dataclass
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class IDToken:
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"""The primary extension that OpenID Connect makes to OAuth 2.0 to enable End-Users to be
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Authenticated is the ID Token data structure. The ID Token is a security token that contains
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Claims about the Authentication of an End-User by an Authorization Server when using a Client,
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and potentially other requested Claims. The ID Token is represented as a
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JSON Web Token (JWT) [JWT].
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https://openid.net/specs/openid-connect-core-1_0.html#IDToken"""
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# All these fields need to optional so we can save an empty IDToken for non-OpenID flows.
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iss: Optional[str] = None
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sub: Optional[str] = None
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aud: Optional[str] = None
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exp: Optional[int] = None
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iat: Optional[int] = None
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auth_time: Optional[int] = None
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nonce: Optional[str] = None
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at_hash: Optional[str] = None
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claims: Dict[str, Any] = field(default_factory=dict)
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@staticmethod
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def from_dict(data: Dict[str, Any]) -> "IDToken":
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"""Reconstruct ID Token from json dictionary"""
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token = IDToken()
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for key, value in data.items():
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setattr(token, key, value)
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return token
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def to_dict(self) -> Dict[str, Any]:
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"""Convert dataclass to dict, and update with keys from `claims`"""
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dic = asdict(self)
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dic.pop("claims")
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dic.update(self.claims)
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return dic
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class RefreshToken(ExpiringModel, BaseGrantModel):
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"""OAuth2 Refresh Token"""
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access_token = models.CharField(
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max_length=255, unique=True, verbose_name=_("Access Token")
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)
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refresh_token = models.CharField(
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max_length=255, unique=True, verbose_name=_("Refresh Token")
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)
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_id_token = models.TextField(verbose_name=_("ID Token"))
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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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@property
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def id_token(self) -> IDToken:
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"""Load ID Token from json"""
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if self._id_token:
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raw_token = json.loads(self._id_token)
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return IDToken.from_dict(raw_token)
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return IDToken()
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@id_token.setter
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def id_token(self, value: IDToken):
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self._id_token = json.dumps(asdict(value))
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def __str__(self):
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return f"{self.provider} - {self.access_token}"
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@property
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def at_hash(self):
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"""Get hashed access_token"""
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hashed_access_token = (
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sha256(self.access_token.encode("ascii")).hexdigest().encode("ascii")
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)
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return (
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base64.urlsafe_b64encode(
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binascii.unhexlify(hashed_access_token[: len(hashed_access_token) // 2])
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)
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.rstrip(b"=")
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.decode("ascii")
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)
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def create_id_token(self, user: User, request: HttpRequest) -> IDToken:
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"""Creates the id_token.
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See: http://openid.net/specs/openid-connect-core-1_0.html#IDToken"""
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sub = ""
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if self.provider.sub_mode == SubModes.HASHED_USER_ID:
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sub = sha256(f"{user.id}-{settings.SECRET_KEY}".encode("ascii")).hexdigest()
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elif self.provider.sub_mode == SubModes.USER_EMAIL:
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sub = user.email
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elif self.provider.sub_mode == SubModes.USER_USERNAME:
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sub = user.username
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elif self.provider.sub_mode == SubModes.USER_UPN:
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sub = user.attributes["upn"]
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else:
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raise ValueError(
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(
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f"Provider {self.provider} has invalid sub_mode "
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f"selected: {self.provider.sub_mode}"
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)
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)
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# Convert datetimes into timestamps.
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now = int(time.time())
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iat_time = now
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exp_time = int(
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now + timedelta_from_string(self.provider.token_validity).seconds
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)
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user_auth_time = user.last_login or user.date_joined
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auth_time = int(dateformat.format(user_auth_time, "U"))
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token = IDToken(
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iss=self.provider.get_issuer(request),
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sub=sub,
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aud=self.provider.client_id,
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exp=exp_time,
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iat=iat_time,
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auth_time=auth_time,
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)
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# Include (or not) user standard claims in the id_token.
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if self.provider.include_claims_in_id_token:
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from passbook.providers.oauth2.views.userinfo import UserInfoView
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user_info = UserInfoView()
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user_info.request = request
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claims = user_info.get_claims(self)
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token.claims = claims
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return token
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