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feat: fine grained access control policy (#2264)

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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>
This commit is contained in:
grs 2025-06-03 17:51:12 -04:00 • committed by GitHub
parent 8bee2954be
commit 7c1998db25
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32 changed files with 956 additions and 450 deletions
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14
llama_stack/distribution/request_headers.py
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@ -10,6 +10,8 @@ import logging
from contextlib import AbstractContextManager
from typing import Any
from llama_stack.distribution.datatypes import User
from .utils.dynamic import instantiate_class_type
log = logging.getLogger(__name__)
@ -21,12 +23,10 @@ PROVIDER_DATA_VAR = contextvars.ContextVar("provider_data", default=None)
class RequestProviderDataContext(AbstractContextManager):
"""Context manager for request provider data"""
def __init__(
self, provider_data: dict[str, Any] | None = None, auth_attributes: dict[str, list[str]] | None = None
):
def __init__(self, provider_data: dict[str, Any] | None = None, user: User | None = None):
self.provider_data = provider_data or {}
if auth_attributes:
self.provider_data["__auth_attributes"] = auth_attributes
if user:
self.provider_data["__authenticated_user"] = user
self.token = None
@ -95,9 +95,9 @@ def request_provider_data_context(
return RequestProviderDataContext(provider_data, auth_attributes)
def get_auth_attributes() -> dict[str, list[str]] | None:
def get_authenticated_user() -> User | None:
"""Helper to retrieve auth attributes from the provider data context"""
provider_data = PROVIDER_DATA_VAR.get()
if not provider_data:
return None
return provider_data.get("__auth_attributes")
return provider_data.get("__authenticated_user")