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security_manager.py
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229 lines (186 loc) · 7.67 KB
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import logging
import os
from contextvars import ContextVar
from typing import Callable, List, Optional, Union
from feast.errors import FeastObjectNotFoundException
from feast.feast_object import FeastObject
from feast.infra.registry.base_registry import BaseRegistry
from feast.permissions.action import AuthzedAction
from feast.permissions.enforcer import enforce_policy
from feast.permissions.permission import Permission
from feast.permissions.user import User
from feast.project import Project
logger = logging.getLogger(__name__)
class SecurityManager:
"""
The security manager it's the entry point to validate the configuration of the current user against the configured permission policies.
It is accessed and defined using the global functions `get_security_manager` and `set_security_manager`
"""
def __init__(
self,
project: str,
registry: BaseRegistry,
):
self._project = project
self._registry = registry
self._current_user: ContextVar[Optional[User]] = ContextVar(
"current_user", default=None
)
def set_current_user(self, current_user: User):
"""
Init the user for the current context.
"""
self._current_user.set(current_user)
@property
def current_user(self) -> Optional[User]:
"""
Returns:
str: the possibly empty instance of the current user. `contextvars` module is used to ensure that each concurrent request has its own
individual user.
"""
return self._current_user.get()
@property
def permissions(self) -> list[Permission]:
"""
Returns:
list[Permission]: the list of `Permission` configured in the Feast registry.
"""
return self._registry.list_permissions(project=self._project)
def assert_permissions(
self,
resources: list[FeastObject],
actions: Union[AuthzedAction, List[AuthzedAction]],
filter_only: bool = False,
) -> list[FeastObject]:
"""
Verify if the current user is authorized to execute the requested actions on the given resources.
If no permissions are defined, the result is to deny the execution.
Args:
resources: The resources for which we need to enforce authorized permission.
actions: The requested actions to be authorized.
filter_only: If `True`, it removes unauthorized resources from the returned value, otherwise it raises a `FeastPermissionError` the
first unauthorized resource. Defaults to `False`.
Returns:
list[FeastObject]: A filtered list of the permitted resources, possibly empty.
Raises:
FeastPermissionError: If the current user is not authorized to execute all the requested actions on the given resources.
"""
return enforce_policy(
permissions=self.permissions,
user=self.current_user if self.current_user is not None else User("", []),
resources=resources,
actions=actions if isinstance(actions, list) else [actions],
filter_only=filter_only,
)
def assert_permissions_to_update(
resource: FeastObject,
getter: Union[
Callable[[str, str, bool], FeastObject], Callable[[str, bool], FeastObject]
],
project: str,
allow_cache: bool = True,
) -> FeastObject:
"""
Verify if the current user is authorized to create or update the given resource.
If the resource already exists, the user must be granted permission to execute DESCRIBE and UPDATE actions.
If the resource does not exist, the user must be granted permission to execute the CREATE action.
If no permissions are defined, the result is to deny the execution.
Args:
resource: The resources for which we need to enforce authorized permission.
getter: The getter function used to retrieve the existing resource instance by name.
The signature must be `get_permission(self, name: str, project: str, allow_cache: bool)`
project: The project nane used in the getter function.
allow_cache: Whether to use cached data. Defaults to `True`.
Returns:
FeastObject: The original `resource`, if permitted.
Raises:
FeastPermissionError: If the current user is not authorized to execute all the requested actions on the given resource or on the existing one.
"""
sm = get_security_manager()
if not is_auth_necessary(sm):
return resource
actions = [AuthzedAction.DESCRIBE, AuthzedAction.UPDATE]
try:
if isinstance(resource, Project):
existing_resource = getter(
name=resource.name,
allow_cache=allow_cache,
) # type: ignore[call-arg]
else:
existing_resource = getter(
name=resource.name,
project=project,
allow_cache=allow_cache,
) # type: ignore[call-arg]
assert_permissions(resource=existing_resource, actions=actions)
except FeastObjectNotFoundException:
actions = [AuthzedAction.CREATE]
resource_to_update = assert_permissions(resource=resource, actions=actions)
return resource_to_update
def assert_permissions(
resource: FeastObject,
actions: Union[AuthzedAction, List[AuthzedAction]],
) -> FeastObject:
"""
A utility function to invoke the `assert_permissions` method on the global security manager.
If no global `SecurityManager` is defined, the execution is permitted.
Args:
resource: The resource for which we need to enforce authorized permission.
actions: The requested actions to be authorized.
Returns:
FeastObject: The original `resource`, if permitted.
Raises:
FeastPermissionError: If the current user is not authorized to execute the requested actions on the given resources.
"""
sm = get_security_manager()
if not is_auth_necessary(sm):
return resource
return sm.assert_permissions( # type: ignore[union-attr]
resources=[resource], actions=actions, filter_only=False
)[0]
def permitted_resources(
resources: list[FeastObject],
actions: Union[AuthzedAction, List[AuthzedAction]],
) -> list[FeastObject]:
"""
A utility function to invoke the `assert_permissions` method on the global security manager.
If no global `SecurityManager` is defined, the execution is permitted.
Args:
resources: The resources for which we need to enforce authorized permission.
actions: The requested actions to be authorized.
Returns:
list[FeastObject]]: A filtered list of the permitted resources, possibly empty.
"""
sm = get_security_manager()
if not is_auth_necessary(sm):
return resources
return sm.assert_permissions(resources=resources, actions=actions, filter_only=True) # type: ignore[union-attr]
"""
The possibly empty global instance of `SecurityManager`.
"""
_sm: Optional[SecurityManager] = None
def get_security_manager() -> Optional[SecurityManager]:
"""
Return the global instance of `SecurityManager`.
"""
global _sm
return _sm
def set_security_manager(sm: SecurityManager):
"""
Initialize the global instance of `SecurityManager`.
"""
global _sm
_sm = sm
def no_security_manager():
"""
Initialize the empty global instance of `SecurityManager`.
"""
global _sm
_sm = None
def is_auth_necessary(sm: Optional[SecurityManager]) -> bool:
intra_communication_base64 = os.getenv("INTRA_COMMUNICATION_BASE64")
return (
sm is not None
and sm.current_user is not None
and sm.current_user.username != intra_communication_base64
)