441 lines
15 KiB
Python
441 lines
15 KiB
Python
"""Outpost models"""
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from dataclasses import asdict, dataclass, field
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from datetime import datetime
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from typing import Any, Iterable, Optional, Union
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from uuid import uuid4
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from dacite import from_dict
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from django.contrib.auth.models import Permission
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from django.core.cache import cache
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from django.db import models, transaction
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from django.db.models.base import Model
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from django.utils.translation import gettext_lazy as _
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from docker.client import DockerClient
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from docker.errors import DockerException
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from guardian.models import UserObjectPermission
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from guardian.shortcuts import assign_perm
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from kubernetes.client import VersionApi, VersionInfo
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from kubernetes.client.api_client import ApiClient
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from kubernetes.client.configuration import Configuration
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from kubernetes.client.exceptions import OpenApiException
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from kubernetes.config.config_exception import ConfigException
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from kubernetes.config.incluster_config import load_incluster_config
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from kubernetes.config.kube_config import load_kube_config_from_dict
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from model_utils.managers import InheritanceManager
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from packaging.version import LegacyVersion, Version, parse
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from structlog.stdlib import get_logger
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from urllib3.exceptions import HTTPError
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from authentik import __version__
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from authentik.core.models import USER_ATTRIBUTE_SA, Provider, Token, TokenIntents, User
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from authentik.crypto.models import CertificateKeyPair
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from authentik.lib.config import CONFIG
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from authentik.lib.models import InheritanceForeignKey
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from authentik.lib.sentry import SentryIgnoredException
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from authentik.outposts.docker_tls import DockerInlineTLS
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OUR_VERSION = parse(__version__)
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OUTPOST_HELLO_INTERVAL = 10
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LOGGER = get_logger()
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class ServiceConnectionInvalid(SentryIgnoredException):
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""""Exception raised when a Service Connection has invalid parameters"""
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@dataclass
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class OutpostConfig:
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"""Configuration an outpost uses to configure it self"""
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authentik_host: str
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authentik_host_insecure: bool = False
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log_level: str = CONFIG.y("log_level")
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error_reporting_enabled: bool = CONFIG.y_bool("error_reporting.enabled")
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error_reporting_environment: str = CONFIG.y(
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"error_reporting.environment", "customer"
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)
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kubernetes_replicas: int = field(default=1)
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kubernetes_namespace: str = field(default="default")
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kubernetes_ingress_annotations: dict[str, str] = field(default_factory=dict)
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kubernetes_ingress_secret_name: str = field(default="authentik-outpost")
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class OutpostModel(Model):
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"""Base model for providers that need more objects than just themselves"""
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def get_required_objects(self) -> Iterable[Union[models.Model, str]]:
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"""Return a list of all required objects"""
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return [self]
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class Meta:
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abstract = True
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class OutpostType(models.TextChoices):
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"""Outpost types, currently only the reverse proxy is available"""
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PROXY = "proxy"
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LDAP = "ldap"
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def default_outpost_config(host: Optional[str] = None):
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"""Get default outpost config"""
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return asdict(OutpostConfig(authentik_host=host or ""))
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@dataclass
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class OutpostServiceConnectionState:
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"""State of an Outpost Service Connection"""
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version: str
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healthy: bool
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class OutpostServiceConnection(models.Model):
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"""Connection details for an Outpost Controller, like Docker or Kubernetes"""
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uuid = models.UUIDField(default=uuid4, editable=False, primary_key=True)
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name = models.TextField()
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local = models.BooleanField(
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default=False,
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help_text=_(
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(
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"If enabled, use the local connection. Required Docker "
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"socket/Kubernetes Integration"
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)
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),
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)
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objects = InheritanceManager()
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@property
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def state_key(self) -> str:
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"""Key used to save connection state in cache"""
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return f"outpost_service_connection_{self.pk.hex}"
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@property
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def state(self) -> OutpostServiceConnectionState:
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"""Get state of service connection"""
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from authentik.outposts.tasks import outpost_service_connection_state
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state = cache.get(self.state_key, None)
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if not state:
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outpost_service_connection_state.delay(self.pk)
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return OutpostServiceConnectionState("", False)
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return state
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def fetch_state(self) -> OutpostServiceConnectionState:
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"""Fetch current Service Connection state"""
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raise NotImplementedError
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@property
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def component(self) -> str:
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"""Return component used to edit this object"""
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raise NotImplementedError
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class Meta:
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verbose_name = _("Outpost Service-Connection")
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verbose_name_plural = _("Outpost Service-Connections")
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class DockerServiceConnection(OutpostServiceConnection):
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"""Service Connection to a Docker endpoint"""
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url = models.TextField(
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help_text=_(
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(
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"Can be in the format of 'unix://<path>' when connecting to a local docker daemon, "
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"or 'https://<hostname>:2376' when connecting to a remote system."
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)
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)
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)
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tls_verification = models.ForeignKey(
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CertificateKeyPair,
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null=True,
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blank=True,
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default=None,
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related_name="+",
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on_delete=models.SET_DEFAULT,
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help_text=_(
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(
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"CA which the endpoint's Certificate is verified against. "
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"Can be left empty for no validation."
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)
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),
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)
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tls_authentication = models.ForeignKey(
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CertificateKeyPair,
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null=True,
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blank=True,
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default=None,
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related_name="+",
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on_delete=models.SET_DEFAULT,
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help_text=_(
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"Certificate/Key used for authentication. Can be left empty for no authentication."
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),
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)
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@property
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def component(self) -> str:
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return "ak-service-connection-docker-form"
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def __str__(self) -> str:
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return f"Docker Service-Connection {self.name}"
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def client(self) -> DockerClient:
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"""Get DockerClient"""
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try:
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client = None
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if self.local:
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client = DockerClient.from_env()
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else:
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client = DockerClient(
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base_url=self.url,
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tls=DockerInlineTLS(
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verification_kp=self.tls_verification,
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authentication_kp=self.tls_authentication,
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).write(),
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)
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client.containers.list()
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except DockerException as exc:
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LOGGER.warning(exc)
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raise ServiceConnectionInvalid from exc
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return client
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def fetch_state(self) -> OutpostServiceConnectionState:
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try:
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client = self.client()
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return OutpostServiceConnectionState(
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version=client.info()["ServerVersion"], healthy=True
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)
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except ServiceConnectionInvalid:
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return OutpostServiceConnectionState(version="", healthy=False)
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class Meta:
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verbose_name = _("Docker Service-Connection")
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verbose_name_plural = _("Docker Service-Connections")
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class KubernetesServiceConnection(OutpostServiceConnection):
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"""Service Connection to a Kubernetes cluster"""
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kubeconfig = models.JSONField(
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help_text=_(
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(
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"Paste your kubeconfig here. authentik will automatically use "
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"the currently selected context."
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)
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),
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blank=True,
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)
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@property
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def component(self) -> str:
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return "ak-service-connection-kubernetes-form"
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def __str__(self) -> str:
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return f"Kubernetes Service-Connection {self.name}"
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def fetch_state(self) -> OutpostServiceConnectionState:
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try:
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client = self.client()
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api_instance = VersionApi(client)
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version: VersionInfo = api_instance.get_code()
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return OutpostServiceConnectionState(
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version=version.git_version, healthy=True
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)
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except (OpenApiException, HTTPError, ServiceConnectionInvalid):
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return OutpostServiceConnectionState(version="", healthy=False)
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def client(self) -> ApiClient:
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"""Get Kubernetes client configured from kubeconfig"""
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config = Configuration()
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try:
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if self.local:
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load_incluster_config(client_configuration=config)
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else:
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load_kube_config_from_dict(self.kubeconfig, client_configuration=config)
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return ApiClient(config)
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except ConfigException as exc:
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raise ServiceConnectionInvalid from exc
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class Meta:
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verbose_name = _("Kubernetes Service-Connection")
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verbose_name_plural = _("Kubernetes Service-Connections")
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class Outpost(models.Model):
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"""Outpost instance which manages a service user and token"""
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uuid = models.UUIDField(default=uuid4, editable=False, primary_key=True)
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name = models.TextField()
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type = models.TextField(choices=OutpostType.choices, default=OutpostType.PROXY)
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service_connection = InheritanceForeignKey(
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OutpostServiceConnection,
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default=None,
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null=True,
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blank=True,
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help_text=_(
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(
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"Select Service-Connection authentik should use to manage this outpost. "
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"Leave empty if authentik should not handle the deployment."
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)
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),
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on_delete=models.SET_DEFAULT,
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)
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_config = models.JSONField(default=default_outpost_config)
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providers = models.ManyToManyField(Provider)
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@property
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def config(self) -> OutpostConfig:
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"""Load config as OutpostConfig object"""
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return from_dict(OutpostConfig, self._config)
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@config.setter
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def config(self, value):
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"""Dump config into json"""
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self._config = asdict(value)
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@property
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def state_cache_prefix(self) -> str:
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"""Key by which the outposts status is saved"""
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return f"outpost_{self.uuid.hex}_state"
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@property
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def state(self) -> list["OutpostState"]:
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"""Get outpost's health status"""
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return OutpostState.for_outpost(self)
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@property
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def user_identifier(self):
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"""Username for service user"""
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return f"ak-outpost-{self.uuid.hex}"
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@property
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def user(self) -> User:
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"""Get/create user with access to all required objects"""
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users = User.objects.filter(username=self.user_identifier)
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if not users.exists():
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user: User = User.objects.create(username=self.user_identifier)
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user.attributes[USER_ATTRIBUTE_SA] = True
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user.set_unusable_password()
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user.save()
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else:
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user = users.first()
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# To ensure the user only has the correct permissions, we delete all of them and re-add
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# the ones the user needs
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with transaction.atomic():
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UserObjectPermission.objects.filter(user=user).delete()
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Permission.objects.filter(user=user).delete()
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for model_or_perm in self.get_required_objects():
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if isinstance(model_or_perm, models.Model):
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model_or_perm: models.Model
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code_name = (
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f"{model_or_perm._meta.app_label}."
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f"view_{model_or_perm._meta.model_name}"
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)
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assign_perm(code_name, user, model_or_perm)
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else:
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assign_perm(model_or_perm, user)
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LOGGER.debug("Updated service account's permissions")
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return user
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@property
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def token_identifier(self) -> str:
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"""Get Token identifier"""
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return f"ak-outpost-{self.pk}-api"
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@property
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def token(self) -> Token:
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"""Get/create token for auto-generated user"""
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token = Token.filter_not_expired(user=self.user, intent=TokenIntents.INTENT_API)
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if token.exists():
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return token.first()
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return Token.objects.create(
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user=self.user,
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identifier=self.token_identifier,
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intent=TokenIntents.INTENT_API,
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description=f"Autogenerated by authentik for Outpost {self.name}",
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expiring=False,
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managed=f"goauthentik.io/outpost/{self.token_identifier}",
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)
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def get_required_objects(self) -> Iterable[Union[models.Model, str]]:
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"""Get an iterator of all objects the user needs read access to"""
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objects: list[Union[models.Model, str]] = [self]
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for provider in (
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Provider.objects.filter(outpost=self).select_related().select_subclasses()
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):
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if isinstance(provider, OutpostModel):
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objects.extend(provider.get_required_objects())
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else:
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objects.append(provider)
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return objects
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def __str__(self) -> str:
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return f"Outpost {self.name}"
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@dataclass
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class OutpostState:
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"""Outpost instance state, last_seen and version"""
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uid: str
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last_seen: Optional[datetime] = field(default=None)
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version: Optional[str] = field(default=None)
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version_should: Union[Version, LegacyVersion] = field(default=OUR_VERSION)
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_outpost: Optional[Outpost] = field(default=None)
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@property
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def version_outdated(self) -> bool:
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"""Check if outpost version matches our version"""
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if not self.version:
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return False
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return parse(self.version) < OUR_VERSION
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@staticmethod
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def for_outpost(outpost: Outpost) -> list["OutpostState"]:
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"""Get all states for an outpost"""
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keys = cache.keys(f"{outpost.state_cache_prefix}_*")
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states = []
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for key in keys:
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channel = key.replace(f"{outpost.state_cache_prefix}_", "")
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states.append(OutpostState.for_channel(outpost, channel))
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return states
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@staticmethod
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def for_channel(outpost: Outpost, channel: str) -> "OutpostState":
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"""Get state for a single channel"""
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key = f"{outpost.state_cache_prefix}_{channel}"
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default_data = {"uid": channel}
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data = cache.get(key, default_data)
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if isinstance(data, str):
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cache.delete(key)
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data = default_data
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state = from_dict(OutpostState, data)
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state.uid = channel
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# pylint: disable=protected-access
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state._outpost = outpost
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return state
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def save(self, timeout=OUTPOST_HELLO_INTERVAL):
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"""Save current state to cache"""
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full_key = f"{self._outpost.state_cache_prefix}_{self.uid}"
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return cache.set(full_key, asdict(self), timeout=timeout)
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def delete(self):
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"""Manually delete from cache, used on channel disconnect"""
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full_key = f"{self._outpost.state_cache_prefix}_{self.uid}"
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cache.delete(full_key)
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