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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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5
llama_stack/distribution/routers/__init__.py
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@ -6,7 +6,7 @@
from typing import Any
from llama_stack.distribution.datatypes import RoutedProtocol
from llama_stack.distribution.datatypes import AccessRule, RoutedProtocol
from llama_stack.distribution.stack import StackRunConfig
from llama_stack.distribution.store import DistributionRegistry
from llama_stack.providers.datatypes import Api, RoutingTable
@ -18,6 +18,7 @@ async def get_routing_table_impl(
impls_by_provider_id: dict[str, RoutedProtocol],
_deps,
dist_registry: DistributionRegistry,
policy: list[AccessRule],
) -> Any:
from ..routing_tables.benchmarks import BenchmarksRoutingTable
from ..routing_tables.datasets import DatasetsRoutingTable
@ -40,7 +41,7 @@ async def get_routing_table_impl(
if api.value not in api_to_tables:
raise ValueError(f"API {api.value} not found in router map")
impl = api_to_tables[api.value](impls_by_provider_id, dist_registry)
impl = api_to_tables[api.value](impls_by_provider_id, dist_registry, policy)
await impl.initialize()
return impl