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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>
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grs 2025-06-03 17:51:12 -04:00 • committed by GitHub
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commit 7c1998db25
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14
llama_stack/distribution/server/auth.py
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@ -105,24 +105,16 @@ class AuthenticationMiddleware:
logger.exception("Error during authentication")
return await self._send_auth_error(send, "Authentication service error")
# Store attributes in request scope for access control
if validation_result.access_attributes:
user_attributes = validation_result.access_attributes.model_dump(exclude_none=True)
else:
logger.warning("No access attributes, setting namespace to token by default")
user_attributes = {
"roles": [token],
}
# Store the client ID in the request scope so that downstream middleware (like QuotaMiddleware)
# can identify the requester and enforce per-client rate limits.
scope["authenticated_client_id"] = token
# Store attributes in request scope
scope["user_attributes"] = user_attributes
scope["principal"] = validation_result.principal
if validation_result.attributes:
scope["user_attributes"] = validation_result.attributes
logger.debug(
f"Authentication successful: {validation_result.principal} with {len(scope['user_attributes'])} attributes"
f"Authentication successful: {validation_result.principal} with {len(validation_result.attributes)} attributes"
)
return await self.app(scope, receive, send)