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OpenShell/e2e/python/test_sandbox_providers.py
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Piotr Mlocek 34fd3cbf64 feat(inference): inference interception and routing (!38)
Closes #67

## Summary

Implements transparent inference interception and routing for sandboxed AI agents. The sandbox proxy intercepts outbound AI SDK calls (OpenAI, Anthropic) and reroutes them through the gateway to policy-controlled backends — enabling organizations to redirect inference traffic to local or self-hosted models without modifying agent code.

**Decision model** — a tri-state OPA evaluation for every CONNECT request:
1. Binary + endpoint explicitly allowed in `network_policies` → **allow** (pass through)
2. Not explicitly allowed + `inference.allowed_routes` configured → **inspect for inference** (TLS intercept, detect API patterns, route through gateway)
3. Otherwise → **deny**

No endpoint declarations or binary lists needed for inference routing. Just configure `inference.allowed_routes`.

## Key Changes

### Sandbox (interception)
- **OPA policy**: New `network_action` Rego rule with three outcomes (`allow`, `inspect_for_inference`, `deny`). New `NetworkAction` enum replaces `PolicyDecision.allowed` bool for the proxy's main decision path.
- **Proxy**: New `InspectForInference` path — TLS-terminates client, parses HTTP, detects inference API patterns (`POST /v1/chat/completions`, `/v1/completions`, `/v1/messages`), strips auth headers, forwards via gRPC.
- **New module**: `l7/inference.rs` — `InferenceApiPattern`, `detect_inference_pattern()`, HTTP request/response parsing.
- **gRPC client**: New `proxy_inference()` for sandbox→gateway forwarding.
- **Sandbox init**: Creates OPA engine when inference is configured, even without `network_policies`.

### Gateway (dispatch)
- **InferenceService**: `ProxyInference` RPC loads sandbox policy, resolves allowed routes, dispatches to router. Full CRUD for inference routes.
- **Proto**: `InferenceRoute`, `InferenceRouteSpec`, `ProxyInferenceRequest/Response`, Inference gRPC service.

### Router (backend proxying)
- **New crate**: `navigator-router` with `Router`, `proxy_with_candidates()`, protocol-based route selection, backend HTTP proxying with auth header rewriting.
- **Mock support** for testing (`mock://` scheme).

### CLI
- `nav inference create/update/delete/list` commands for route management.

### Python SDK
- Updated protobuf bindings. Removed old `inference.py` client (replaced by transparent interception).

### Documentation
- New `architecture/inference-routing.md` — end-to-end system documentation.
- Updated `architecture/sandbox.md` — proxy, OPA, and source index sections.
- Updated `architecture/README.md` — new subsystem overview and diagram.

## Addendum: Chunked Transfer Compatibility

This branch now also fixes intercepted SDK requests that send chunked request bodies:

- `inspect_for_inference` now accepts `Transfer-Encoding: chunked` and decodes chunked request bodies before forwarding to the gateway
- Removed the prior `411 Length Required` response for chunked intercepted requests
- Added request/response header sanitization for framing and hop-by-hop headers (`content-length`, `transfer-encoding`, `connection`, etc.) to keep forwarded requests and returned responses valid
- Added unit tests for chunked parsing and header sanitization

Note: this improves compatibility for streaming-style SDK request patterns; true token-by-token passthrough response streaming is still a separate follow-up.

## Minimal Policy for Inference Routing

```yaml
inference:
  allowed_routes:
    - local
```

Any outgoing connection from a binary not explicitly allowed in `network_policies` will be intercepted and checked for inference API patterns.

## Test Plan

- [x] `cargo test --workspace` — all tests pass
- [x] `mise run pre-commit` — all checks pass
- [x] E2E: OpenAI chat completions routed through gateway
- [x] E2E: Anthropic messages routed through gateway
- [x] E2E: Python OpenAI SDK from sandbox (`examples/inference/inference.py`)
- [x] E2E test: `e2e/python/test_inference_routing.py`
2026-02-23 11:48:48 -08:00

214 lines
7.1 KiB
Python

"""E2e tests for provider credential injection into sandboxes.
Provider credentials are fetched at runtime by the sandbox supervisor via the
GetSandboxProviderEnvironment gRPC call. They should appear as environment
variables inside the sandbox process, but must NOT be present in the persisted
sandbox spec's environment map (they are never baked into the K8s pod spec).
"""
from __future__ import annotations
from contextlib import contextmanager
from typing import TYPE_CHECKING
import grpc
import pytest
from navigator._proto import datamodel_pb2, navigator_pb2, sandbox_pb2
if TYPE_CHECKING:
from collections.abc import Callable, Iterator
from navigator import Sandbox, SandboxClient
def _default_policy() -> sandbox_pb2.SandboxPolicy:
return sandbox_pb2.SandboxPolicy(
version=1,
inference=sandbox_pb2.InferencePolicy(allowed_routes=["local"]),
filesystem=sandbox_pb2.FilesystemPolicy(
include_workdir=True,
read_only=["/usr", "/lib", "/etc", "/app"],
read_write=["/sandbox", "/tmp"],
),
landlock=sandbox_pb2.LandlockPolicy(compatibility="best_effort"),
process=sandbox_pb2.ProcessPolicy(
run_as_user="sandbox", run_as_group="sandbox"
),
)
@contextmanager
def provider(
stub: object,
*,
name: str,
provider_type: str,
credentials: dict[str, str],
) -> Iterator[str]:
"""Create a provider for the duration of the block, then delete it."""
# Clean up any leftover from a previous run.
_delete_provider(stub, name)
stub.CreateProvider(
navigator_pb2.CreateProviderRequest(
provider=datamodel_pb2.Provider(
name=name,
type=provider_type,
credentials=credentials,
)
)
)
try:
yield name
finally:
_delete_provider(stub, name)
def _delete_provider(stub: object, name: str) -> None:
"""Delete a provider, ignoring not-found errors."""
try:
stub.DeleteProvider(navigator_pb2.DeleteProviderRequest(name=name))
except grpc.RpcError as exc:
if hasattr(exc, "code") and exc.code() == grpc.StatusCode.NOT_FOUND:
pass
else:
raise
# TODO: Once the sandbox supervisor sets provider credentials (rather than the
# server injecting them via exec environment), these tests will no longer be
# able to read credential values directly. Update the assertions to verify
# that the env vars are *present* (e.g. non-empty) without checking exact
# values, since the supervisor will be the sole source of truth.
def test_provider_credentials_available_as_env_vars(
sandbox: Callable[..., Sandbox],
sandbox_client: SandboxClient,
) -> None:
"""Sandbox process can read provider credentials as environment variables."""
with provider(
sandbox_client._stub,
name="e2e-test-provider-env",
provider_type="claude",
credentials={"ANTHROPIC_API_KEY": "sk-e2e-test-key-12345"},
) as provider_name:
spec = datamodel_pb2.SandboxSpec(
policy=_default_policy(),
providers=[provider_name],
)
def read_env_var() -> str:
import os
return os.environ.get("ANTHROPIC_API_KEY", "NOT_SET")
with sandbox(spec=spec, delete_on_exit=True) as sb:
result = sb.exec_python(read_env_var)
assert result.exit_code == 0, result.stderr
assert result.stdout.strip() == "sk-e2e-test-key-12345"
def test_generic_provider_credentials_available_as_env_vars(
sandbox: Callable[..., Sandbox],
sandbox_client: SandboxClient,
) -> None:
"""Generic provider credentials are injected as arbitrary sandbox env vars."""
with provider(
sandbox_client._stub,
name="e2e-test-generic-provider-env",
provider_type="generic",
credentials={
"CUSTOM_SERVICE_TOKEN": "token-generic-123",
"CUSTOM_SERVICE_URL": "https://internal.example.test/api",
},
) as provider_name:
spec = datamodel_pb2.SandboxSpec(
policy=_default_policy(),
providers=[provider_name],
)
def read_generic_env_vars() -> str:
import os
token = os.environ.get("CUSTOM_SERVICE_TOKEN", "NOT_SET")
url = os.environ.get("CUSTOM_SERVICE_URL", "NOT_SET")
return f"{token}|{url}"
with sandbox(spec=spec, delete_on_exit=True) as sb:
result = sb.exec_python(read_generic_env_vars)
assert result.exit_code == 0, result.stderr
assert (
result.stdout.strip()
== "token-generic-123|https://internal.example.test/api"
)
def test_nvidia_provider_injects_nvidia_api_key_env_var(
sandbox: Callable[..., Sandbox],
sandbox_client: SandboxClient,
) -> None:
"""NVIDIA provider projects NVIDIA_API_KEY into sandbox process env."""
with provider(
sandbox_client._stub,
name="e2e-test-nvidia-provider-env",
provider_type="nvidia",
credentials={"NVIDIA_API_KEY": "nvapi-e2e-test-key"},
) as provider_name:
spec = datamodel_pb2.SandboxSpec(
policy=_default_policy(),
providers=[provider_name],
)
def read_nvidia_key() -> str:
import os
return os.environ.get("NVIDIA_API_KEY", "NOT_SET")
with sandbox(spec=spec, delete_on_exit=True) as sb:
result = sb.exec_python(read_nvidia_key)
assert result.exit_code == 0, result.stderr
assert result.stdout.strip() == "nvapi-e2e-test-key"
def test_create_sandbox_rejects_unknown_provider(
sandbox_client: SandboxClient,
) -> None:
"""CreateSandbox fails fast when a provider name does not exist."""
spec = datamodel_pb2.SandboxSpec(
policy=_default_policy(),
providers=["nonexistent-provider-xyz"],
)
with pytest.raises(grpc.RpcError) as exc_info:
sandbox_client.create(spec=spec)
assert exc_info.value.code() == grpc.StatusCode.FAILED_PRECONDITION
assert "nonexistent-provider-xyz" in exc_info.value.details()
def test_credentials_not_in_persisted_spec_environment(
sandbox: Callable[..., Sandbox],
sandbox_client: SandboxClient,
) -> None:
"""Provider credentials should NOT appear in the sandbox spec's environment map."""
with provider(
sandbox_client._stub,
name="e2e-test-no-persist",
provider_type="claude",
credentials={"ANTHROPIC_API_KEY": "sk-should-not-persist"},
) as provider_name:
spec = datamodel_pb2.SandboxSpec(
policy=_default_policy(),
providers=[provider_name],
)
with sandbox(spec=spec, delete_on_exit=True) as sb:
# Fetch the sandbox record from the server and inspect spec.environment.
fetched = sandbox_client._stub.GetSandbox(
navigator_pb2.GetSandboxRequest(name=sb.sandbox.name)
)
persisted_env = dict(fetched.sandbox.spec.environment)
assert "ANTHROPIC_API_KEY" not in persisted_env, (
"credentials should not be persisted in sandbox spec environment"
)