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7c1998db25
This allows a set of rules to be defined for determining access to
resources. The rules are (loosely) based on the cedar policy format.
A rule defines a list of action either to permit or to forbid. It may
specify a principal or a resource that must match for the rule to take
effect. It may also specify a condition, either a 'when' or an 'unless',
with additional constraints as to where the rule applies.
A list of rules is held for each type to be protected and tried in order
to find a match. If a match is found, the request is permitted or
forbidden depening on the type of rule. If no match is found, the
request is denied. If no rules are specified for a given type, a rule
that allows any action as long as the resource attributes match the user
attributes is added (i.e. the previous behaviour is the default.
Some examples in yaml:
```
model:
- permit:
principal: user-1
actions: [create, read, delete]
comment: user-1 has full access to all models
- permit:
principal: user-2
actions: [read]
resource: model-1
comment: user-2 has read access to model-1 only
- permit:
actions: [read]
when:
user_in: resource.namespaces
comment: any user has read access to models with matching attributes
vector_db:
- forbid:
actions: [create, read, delete]
unless:
user_in: role::admin
comment: only user with admin role can use vector_db resources
```
---------
Signed-off-by: Gordon Sim <gsim@redhat.com>
103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the terms described in the LICENSE file in
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# the root directory of this source tree.
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import contextvars
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import json
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import logging
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from contextlib import AbstractContextManager
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from typing import Any
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from llama_stack.distribution.datatypes import User
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from .utils.dynamic import instantiate_class_type
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log = logging.getLogger(__name__)
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# Context variable for request provider data and auth attributes
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PROVIDER_DATA_VAR = contextvars.ContextVar("provider_data", default=None)
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class RequestProviderDataContext(AbstractContextManager):
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"""Context manager for request provider data"""
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def __init__(self, provider_data: dict[str, Any] | None = None, user: User | None = None):
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self.provider_data = provider_data or {}
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if user:
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self.provider_data["__authenticated_user"] = user
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self.token = None
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def __enter__(self):
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# Save the current value and set the new one
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self.token = PROVIDER_DATA_VAR.set(self.provider_data)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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# Restore the previous value
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if self.token is not None:
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PROVIDER_DATA_VAR.reset(self.token)
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class NeedsRequestProviderData:
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def get_request_provider_data(self) -> Any:
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spec = self.__provider_spec__
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if not spec:
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raise ValueError(f"Provider spec not set on {self.__class__}")
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provider_type = spec.provider_type
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validator_class = spec.provider_data_validator
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if not validator_class:
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raise ValueError(f"Provider {provider_type} does not have a validator")
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val = PROVIDER_DATA_VAR.get()
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if not val:
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return None
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validator = instantiate_class_type(validator_class)
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try:
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provider_data = validator(**val)
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return provider_data
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except Exception as e:
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log.error(f"Error parsing provider data: {e}")
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return None
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def parse_request_provider_data(headers: dict[str, str]) -> dict[str, Any] | None:
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"""Parse provider data from request headers"""
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keys = [
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"X-LlamaStack-Provider-Data",
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"x-llamastack-provider-data",
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]
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val = None
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for key in keys:
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val = headers.get(key, None)
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if val:
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break
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if not val:
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return None
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try:
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return json.loads(val)
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except json.JSONDecodeError:
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log.error("Provider data not encoded as a JSON object!")
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return None
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def request_provider_data_context(
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headers: dict[str, str], auth_attributes: dict[str, list[str]] | None = None
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) -> AbstractContextManager:
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"""Context manager that sets request provider data from headers and auth attributes for the duration of the context"""
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provider_data = parse_request_provider_data(headers)
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return RequestProviderDataContext(provider_data, auth_attributes)
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def get_authenticated_user() -> User | None:
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"""Helper to retrieve auth attributes from the provider data context"""
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provider_data = PROVIDER_DATA_VAR.get()
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if not provider_data:
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return None
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return provider_data.get("__authenticated_user")
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