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authentik/passbook/outposts/models.py

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"""Outpost models"""
from dataclasses import asdict, dataclass, field
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from datetime import datetime
from typing import Dict, Iterable, List, Optional, Type, Union
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from uuid import uuid4
from dacite import from_dict
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from django.conf import settings
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from django.core.cache import cache
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from django.db import models, transaction
from django.db.models.base import Model
from django.forms.models import ModelForm
from django.http import HttpRequest
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from django.utils.translation import gettext_lazy as _
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from docker.client import DockerClient
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
from kubernetes.client.api_client import ApiClient
from kubernetes.client.configuration import Configuration
from kubernetes.client.exceptions import OpenApiException
from kubernetes.config.config_exception import ConfigException
from kubernetes.config.incluster_config import load_incluster_config
from kubernetes.config.kube_config import load_kube_config, load_kube_config_from_dict
from model_utils.managers import InheritanceManager
from packaging.version import LegacyVersion, Version, parse
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from passbook import __version__
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from passbook.core.models import Provider, Token, TokenIntents, User
from passbook.lib.config import CONFIG
from passbook.lib.models import InheritanceForeignKey
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from passbook.lib.sentry import SentryIgnoredException
from passbook.lib.utils.template import render_to_string
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OUR_VERSION = parse(__version__)
OUTPOST_HELLO_INTERVAL = 10
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class ServiceConnectionInvalid(SentryIgnoredException):
""""Exception raised when a Service Connection has invalid parameters"""
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@dataclass
class OutpostConfig:
"""Configuration an outpost uses to configure it self"""
passbook_host: str
passbook_host_insecure: bool = False
log_level: str = CONFIG.y("log_level")
error_reporting_enabled: bool = CONFIG.y_bool("error_reporting.enabled")
error_reporting_environment: str = CONFIG.y(
"error_reporting.environment", "customer"
)
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kubernetes_replicas: int = field(default=1)
kubernetes_namespace: str = field(default="default")
kubernetes_ingress_annotations: Dict[str, str] = field(default_factory=dict)
kubernetes_ingress_secret_name: str = field(default="passbook-outpost")
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class OutpostModel(Model):
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"""Base model for providers that need more objects than just themselves"""
def get_required_objects(self) -> Iterable[models.Model]:
"""Return a list of all required objects"""
return [self]
class Meta:
abstract = True
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class OutpostType(models.TextChoices):
"""Outpost types, currently only the reverse proxy is available"""
PROXY = "proxy"
def default_outpost_config():
"""Get default outpost config"""
return asdict(OutpostConfig(passbook_host=""))
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@dataclass
class OutpostServiceConnectionState:
"""State of an Outpost Service Connection"""
version: str
healthy: bool
class OutpostServiceConnection(models.Model):
"""Connection details for an Outpost Controller, like Docker or Kubernetes"""
uuid = models.UUIDField(default=uuid4, editable=False, primary_key=True)
name = models.TextField()
local = models.BooleanField(
default=False,
unique=True,
help_text=_(
(
"If enabled, use the local connection. Required Docker "
"socket/Kubernetes Integration"
)
),
)
objects = InheritanceManager()
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@property
def state(self) -> OutpostServiceConnectionState:
"""Get state of service connection"""
state_key = f"outpost_service_connection_{self.pk.hex}"
state = cache.get(state_key, None)
if state:
state = self._get_state()
cache.set(state_key, state)
return state
def _get_state(self) -> OutpostServiceConnectionState:
raise NotImplementedError
@property
def form(self) -> Type[ModelForm]:
"""Return Form class used to edit this object"""
raise NotImplementedError
class Meta:
verbose_name = _("Outpost Service-Connection")
verbose_name_plural = _("Outpost Service-Connections")
class DockerServiceConnection(OutpostServiceConnection):
"""Service Connection to a Docker endpoint"""
url = models.TextField()
tls = models.BooleanField()
@property
def form(self) -> Type[ModelForm]:
from passbook.outposts.forms import DockerServiceConnectionForm
return DockerServiceConnectionForm
def __str__(self) -> str:
return f"Docker Service-Connection {self.name}"
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def client(self) -> DockerClient:
"""Get DockerClient"""
try:
client = None
if self.local:
client = DockerClient.from_env()
else:
client = DockerClient(
base_url=self.url,
tls=self.tls,
)
client.containers.list()
except DockerException as exc:
raise ServiceConnectionInvalid from exc
return client
def _get_state(self) -> OutpostServiceConnectionState:
try:
client = self.client()
return OutpostServiceConnectionState(
version=client.info()["ServerVersion"], healthy=True
)
except ServiceConnectionInvalid:
return OutpostServiceConnectionState(version="", healthy=False)
class Meta:
verbose_name = _("Docker Service-Connection")
verbose_name_plural = _("Docker Service-Connections")
class KubernetesServiceConnection(OutpostServiceConnection):
"""Service Connection to a Kubernetes cluster"""
kubeconfig = models.JSONField(
help_text=_(
(
"Paste your kubeconfig here. passbook will automatically use "
"the currently selected context."
)
)
)
@property
def form(self) -> Type[ModelForm]:
from passbook.outposts.forms import KubernetesServiceConnectionForm
return KubernetesServiceConnectionForm
def __str__(self) -> str:
return f"Kubernetes Service-Connection {self.name}"
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def _get_state(self) -> OutpostServiceConnectionState:
try:
client = self.client()
api_instance = VersionApi(client)
version: VersionInfo = api_instance.get_code()
return OutpostServiceConnectionState(
version=version.git_version, healthy=True
)
except OpenApiException:
return OutpostServiceConnectionState(version="", healthy=False)
def client(self) -> ApiClient:
"""Get Kubernetes client configured from kubeconfig"""
config = Configuration()
try:
if self.local:
load_incluster_config(client_configuration=config)
else:
load_kube_config_from_dict(self.kubeconfig, client_configuration=config)
return ApiClient(config)
except ConfigException as exc:
if not settings.DEBUG:
raise ServiceConnectionInvalid from exc
load_kube_config(client_configuration=config)
return config
class Meta:
verbose_name = _("Kubernetes Service-Connection")
verbose_name_plural = _("Kubernetes Service-Connections")
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class Outpost(models.Model):
"""Outpost instance which manages a service user and token"""
uuid = models.UUIDField(default=uuid4, editable=False, primary_key=True)
name = models.TextField()
type = models.TextField(choices=OutpostType.choices, default=OutpostType.PROXY)
service_connection = InheritanceForeignKey(
OutpostServiceConnection,
default=None,
null=True,
blank=True,
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help_text=_(
(
"Select Service-Connection passbook should use to manage this outpost. "
"Leave empty if passbook should not handle the deployment."
)
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),
on_delete=models.SET_DEFAULT,
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)
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_config = models.JSONField(default=default_outpost_config)
providers = models.ManyToManyField(Provider)
@property
def config(self) -> OutpostConfig:
"""Load config as OutpostConfig object"""
return from_dict(OutpostConfig, self._config)
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@config.setter
def config(self, value):
"""Dump config into json"""
self._config = asdict(value)
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@property
def state_cache_prefix(self) -> str:
"""Key by which the outposts status is saved"""
return f"outpost_{self.uuid.hex}_state"
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@property
def state(self) -> List["OutpostState"]:
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"""Get outpost's health status"""
return OutpostState.for_outpost(self)
@property
def user_identifier(self):
"""Username for service user"""
return f"pb-outpost-{self.uuid.hex}"
@property
def user(self) -> User:
"""Get/create user with access to all required objects"""
users = User.objects.filter(username=self.user_identifier)
if not users.exists():
user: User = User.objects.create(username=self.user_identifier)
user.set_unusable_password()
user.save()
else:
user = users.first()
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# To ensure the user only has the correct permissions, we delete all of them and re-add
# the ones the user needs
with transaction.atomic():
UserObjectPermission.objects.filter(user=user).delete()
for model in self.get_required_objects():
code_name = f"{model._meta.app_label}.view_{model._meta.model_name}"
assign_perm(code_name, user, model)
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return user
@property
def token_identifier(self) -> str:
"""Get Token identifier"""
return f"pb-outpost-{self.pk}-api"
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@property
def token(self) -> Token:
"""Get/create token for auto-generated user"""
token = Token.filter_not_expired(user=self.user, intent=TokenIntents.INTENT_API)
if token.exists():
return token.first()
return Token.objects.create(
user=self.user,
identifier=self.token_identifier,
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intent=TokenIntents.INTENT_API,
description=f"Autogenerated by passbook for Outpost {self.name}",
expiring=False,
)
def get_required_objects(self) -> Iterable[models.Model]:
"""Get an iterator of all objects the user needs read access to"""
objects = [self]
for provider in (
Provider.objects.filter(outpost=self).select_related().select_subclasses()
):
if isinstance(provider, OutpostModel):
objects.extend(provider.get_required_objects())
else:
objects.append(provider)
return objects
def html_deployment_view(self, request: HttpRequest) -> Optional[str]:
"""return template and context modal to view token and other config info"""
return render_to_string(
"outposts/deployment_modal.html",
{"outpost": self, "full_url": request.build_absolute_uri("/")},
)
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def __str__(self) -> str:
return f"Outpost {self.name}"
@dataclass
class OutpostState:
"""Outpost instance state, last_seen and version"""
uid: str
last_seen: Optional[datetime] = field(default=None)
version: Optional[str] = field(default=None)
version_should: Union[Version, LegacyVersion] = field(default=OUR_VERSION)
_outpost: Optional[Outpost] = field(default=None)
@property
def version_outdated(self) -> bool:
"""Check if outpost version matches our version"""
if not self.version:
return False
return parse(self.version) < OUR_VERSION
@staticmethod
def for_outpost(outpost: Outpost) -> List["OutpostState"]:
"""Get all states for an outpost"""
keys = cache.keys(f"{outpost.state_cache_prefix}_*")
states = []
for key in keys:
channel = key.replace(f"{outpost.state_cache_prefix}_", "")
states.append(OutpostState.for_channel(outpost, channel))
return states
@staticmethod
def for_channel(outpost: Outpost, channel: str) -> "OutpostState":
"""Get state for a single channel"""
key = f"{outpost.state_cache_prefix}_{channel}"
default_data = {"uid": channel}
data = cache.get(key, default_data)
if isinstance(data, str):
cache.delete(key)
data = default_data
state = from_dict(OutpostState, data)
state.uid = channel
# pylint: disable=protected-access
state._outpost = outpost
return state
def save(self, timeout=OUTPOST_HELLO_INTERVAL):
"""Save current state to cache"""
full_key = f"{self._outpost.state_cache_prefix}_{self.uid}"
return cache.set(full_key, asdict(self), timeout=timeout)
def delete(self):
"""Manually delete from cache, used on channel disconnect"""
full_key = f"{self._outpost.state_cache_prefix}_{self.uid}"
cache.delete(full_key)