mirror of
https://github.com/usestrix/strix.git
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oyasumiandClaude Opus 5
6e5bb2e76e
Introduce a pre-execution safety layer that reviews effectful agent actions against compiled, frozen evidence before they run. `--safety-mode guarded` allows non-destructive interaction after review; `--safety-mode observe` permits passive target interaction only. `off` stays the default, so existing runs are unchanged. Deterministic rules decide what they can on their own: destructive commands, code-loading environment overrides, blocked browser actions, and mutating requests in observe mode are refused without a model call, and a small set of read-only commands is allowed outright. Everything else compiles an evidence packet — command, scope, script source and its local import closure, prior tool-call evidence, and browser snapshot context — for a bounded reviewer that may make one isolated inspection call. Incomplete evidence fails closed. In safety modes, user-owned local directories are copied into the run directory so the originals are never mounted writable, while `.git`, `.agents`, and `.codex` inside the copy stay read-only. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
540 lines
17 KiB
Python
540 lines
17 KiB
Python
"""Deterministic safety evidence compilation."""
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from __future__ import annotations
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import io
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from types import SimpleNamespace
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from typing import TYPE_CHECKING, Any
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import pytest
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from strix.config.settings import SafetySettings
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from strix.safety.evidence import compile_evidence, parse_command
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if TYPE_CHECKING:
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from pathlib import Path
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# Marks a path that exists but cannot be read, which must not look like an absent module.
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_UNREADABLE = "<unreadable>"
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class _Sandbox:
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def __init__(self, files: dict[str, str]) -> None:
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self.files = files
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async def read(self, path: Path) -> io.BytesIO:
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key = path.as_posix()
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if key not in self.files:
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raise FileNotFoundError(key)
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if self.files[key] == _UNREADABLE:
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raise PermissionError(key)
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return io.BytesIO(self.files[key].encode())
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def _ctx(files: dict[str, str], *, turn_input: list[Any] | None = None) -> Any:
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return SimpleNamespace(
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context={"agent_id": "agent-1", "sandbox_session": _Sandbox(files)},
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tool_call_id="call-1",
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turn_input=turn_input or [],
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)
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async def _compile(
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command: str,
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files: dict[str, str] | None = None,
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*,
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turn_input: list[Any] | None = None,
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workdir: str | None = None,
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mode: str = "guarded",
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) -> Any:
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arguments: dict[str, Any] = {"cmd": command}
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if workdir is not None:
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arguments["workdir"] = workdir
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return await compile_evidence(
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case_id="case",
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ctx=_ctx(files or {}, turn_input=turn_input),
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arguments=arguments,
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mode=mode,
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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def test_parse_command_identifies_direct_browser_action() -> None:
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plan = parse_command("agent-browser click @e3")
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assert plan.browser is True
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assert plan.browser_action == "click"
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assert plan.compound is False
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def test_parse_command_marks_browser_chaining_compound() -> None:
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plan = parse_command("agent-browser click @e3 && agent-browser snapshot -i")
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assert plan.browser is True
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assert plan.compound is True
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@pytest.mark.asyncio
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async def test_python_script_collects_local_dependency_source() -> None:
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bundle = await compile_evidence(
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case_id="case-1",
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ctx=_ctx(
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{
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"/workspace/check.py": "from helper import target\nprint(target)\n",
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"/workspace/helper.py": 'target = "https://example.test/health"\n',
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}
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),
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arguments={"cmd": "python /workspace/check.py"},
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mode="guarded",
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scope={"authorized_targets": [{"value": "https://example.test"}]},
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user_instruction="Inspect the test target.",
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settings=SafetySettings(),
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)
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try:
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paths = {item["path"] for item in bundle.packet["artifacts"]}
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assert paths == {"/workspace/check.py", "/workspace/helper.py"}
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assert bundle.complete is True
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assert bundle.deterministic_block is None
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_browser_automation_inside_script_is_blocked() -> None:
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bundle = await compile_evidence(
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case_id="case-2",
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ctx=_ctx(
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{
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"/workspace/browser.py": (
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'import subprocess\nsubprocess.run(["agent-browser", "click", "@e3"])\n'
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)
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}
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),
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arguments={"cmd": "python /workspace/browser.py"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.deterministic_block is not None
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assert "direct agent-browser commands" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_browser_library_import_inside_script_is_blocked() -> None:
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bundle = await compile_evidence(
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case_id="case-browser-import",
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ctx=_ctx({"/workspace/browser.py": "from playwright.async_api import Browser\n"}),
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arguments={"cmd": "python /workspace/browser.py"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.deterministic_block is not None
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assert "direct agent-browser commands" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_dynamic_exec_makes_script_evidence_incomplete() -> None:
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bundle = await compile_evidence(
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case_id="case-3",
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ctx=_ctx({"/workspace/dynamic.py": "exec(input())\n"}),
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arguments={"cmd": "python /workspace/dynamic.py"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.complete is False
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assert any("exec" in reason for reason in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_dynamic_network_destination_is_incomplete() -> None:
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bundle = await compile_evidence(
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case_id="case-dynamic-network",
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ctx=_ctx(
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{"/workspace/network.py": ("import requests\nimport sys\nrequests.get(sys.argv[1])\n")}
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),
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arguments={"cmd": "python /workspace/network.py https://example.test"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.complete is False
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assert any("dynamic network destination" in item for item in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_creation_and_execution_chain_must_be_split() -> None:
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bundle = await compile_evidence(
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case_id="case-chain",
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ctx=_ctx({}),
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arguments={"cmd": "curl https://example.test/x.py -o x.py && python x.py"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.deterministic_block is not None
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assert "split" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_browser_ref_requires_prior_snapshot() -> None:
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bundle = await compile_evidence(
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case_id="case-4",
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ctx=_ctx({}),
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arguments={"cmd": "agent-browser click @e3"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.complete is False
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assert "prior snapshot" in bundle.incomplete_reasons[0]
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_browser_ref_uses_prior_snapshot_output() -> None:
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history = [
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{
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"type": "function_call",
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"name": "exec_command",
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"call_id": "snapshot-1",
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"arguments": '{"cmd":"agent-browser snapshot -i"}',
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},
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{
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"type": "function_call_output",
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"call_id": "snapshot-1",
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"output": '@e3 [button type="submit"] "Search"',
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},
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]
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bundle = await compile_evidence(
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case_id="case-5",
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ctx=_ctx({}, turn_input=history),
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arguments={"cmd": "agent-browser click @e3"},
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mode="guarded",
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scope={},
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user_instruction="",
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settings=SafetySettings(),
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)
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try:
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assert bundle.complete is True
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assert bundle.packet["browser"]["latest_snapshot"]["call_id"] == "snapshot-1"
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finally:
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bundle.cleanup()
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@pytest.mark.parametrize(
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"command",
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[
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"ls -la\nrm -rf /workspace/app",
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"ls & rm -rf /workspace/app",
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"ls -la; rm -rf /workspace/app",
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],
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)
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def test_separators_beyond_double_operators_are_compound(command: str) -> None:
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plan = parse_command(command)
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assert plan.compound is True
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assert plan.read_only is False
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@pytest.mark.asyncio
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@pytest.mark.parametrize(
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"command",
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["ls -la\nrm -rf /workspace/app", "ls & rm -rf /workspace/app"],
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)
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async def test_destructive_command_chained_to_a_read_command_is_blocked(command: str) -> None:
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bundle = await _compile(command)
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try:
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assert bundle.deterministic_allow is None
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assert bundle.deterministic_block is not None
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assert "destructive" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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def test_quoted_separator_is_not_compound() -> None:
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assert parse_command("curl 'https://example.test/?a=1&b=2'").compound is False
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assert parse_command('agent-browser open "https://example.test/?a=1&b=2"').compound is False
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def test_read_only_fast_path_inspects_options() -> None:
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assert parse_command("rg -n --json needle /workspace").read_only is True
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assert parse_command("ls -la /workspace").read_only is True
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# `--pre` hands ripgrep an arbitrary program to run on every matched file.
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assert parse_command("rg --pre /workspace/payload.sh -e . /workspace").read_only is False
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assert parse_command("rg --search-zip needle /workspace").read_only is False
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assert parse_command("file -C -m /workspace/magic /workspace/x").read_only is False
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@pytest.mark.asyncio
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async def test_inline_python_source_collects_local_dependencies() -> None:
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bundle = await _compile(
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'python -c "import wipe; wipe.go()"',
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{"/workspace/wipe.py": "import shutil\n\n\ndef go():\n shutil.rmtree('/workspace')\n"},
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workdir="/workspace",
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)
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try:
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artifacts = bundle.packet["artifacts"]
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assert [item["path"] for item in artifacts] == ["<inline>", "/workspace/wipe.py"]
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dependency = bundle.root / artifacts[1]["evidence_path"]
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assert "shutil.rmtree" in dependency.read_text(encoding="utf-8")
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_inline_python_dynamic_feature_is_incomplete() -> None:
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bundle = await _compile('python -c "exec(input())"', workdir="/workspace")
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try:
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assert bundle.complete is False
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assert any("exec" in reason for reason in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_relative_imports_are_collected() -> None:
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bundle = await _compile(
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"python /workspace/main.py",
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{
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"/workspace/main.py": "import pkg.mod\n",
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"/workspace/pkg/__init__.py": "",
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"/workspace/pkg/mod.py": "from . import payload\nfrom ..sibling import helper\n",
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"/workspace/pkg/payload.py": "import shutil\nshutil.rmtree('/workspace/app')\n",
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"/workspace/sibling.py": "helper = 1\n",
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},
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)
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try:
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paths = {item["path"] for item in bundle.packet["artifacts"]}
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assert "/workspace/pkg/payload.py" in paths
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assert "/workspace/sibling.py" in paths
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_import_path_mutation_makes_evidence_incomplete() -> None:
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bundle = await _compile(
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"python /workspace/run.py",
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{
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"/workspace/run.py": (
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"import sys\nsys.path.insert(0, '/workspace/lib')\nimport payload\npayload.main()\n"
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)
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},
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)
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try:
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assert bundle.complete is False
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assert any("search path" in reason for reason in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_unreadable_local_module_is_reported() -> None:
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bundle = await _compile(
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"python /workspace/run.py",
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{"/workspace/run.py": "import payload\n", "/workspace/payload.py": _UNREADABLE},
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)
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try:
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assert bundle.complete is False
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assert any("cannot read local module" in reason for reason in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_interpreter_environment_override_is_blocked() -> None:
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bundle = await _compile("PYTHONPATH=/workspace/lib python /workspace/run.py")
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try:
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assert bundle.deterministic_block is not None
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assert "PYTHONPATH" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_parent_traversal_leaves_the_workspace() -> None:
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bundle = await _compile("python ../../opt/staged/run.py", workdir="/workspace")
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try:
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assert bundle.complete is False
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assert "outside the inspectable workspace" in bundle.incomplete_reasons[0]
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finally:
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bundle.cleanup()
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def test_env_wrapper_resolves_the_real_executable() -> None:
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plan = parse_command("/usr/bin/env agent-browser click @e5")
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assert plan.browser is True
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assert plan.browser_action == "click"
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def test_opaque_wrapper_fails_closed() -> None:
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assert parse_command("timeout 5 rm -rf /workspace").parse_error is not None
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@pytest.mark.asyncio
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async def test_browser_session_env_override_is_blocked() -> None:
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bundle = await _compile("AGENT_BROWSER_SESSION=shared agent-browser click @e3")
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try:
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assert bundle.deterministic_block is not None
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assert "AGENT_BROWSER_SESSION" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_unknown_browser_option_cannot_mask_the_action() -> None:
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bundle = await _compile("agent-browser --timeout 5000 eval \"fetch('/x')\"")
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try:
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assert bundle.packet["pending_action"]["browser_action"] == "eval"
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assert bundle.deterministic_block is not None
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assert "eval" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_unparseable_browser_option_fails_closed() -> None:
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bundle = await _compile("agent-browser --unknown-flag value click @e3")
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try:
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assert bundle.complete is False
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assert any("unrecognized" in reason for reason in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_attached_browser_session_override_is_blocked() -> None:
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bundle = await _compile("agent-browser --session=evil click @e3")
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try:
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assert bundle.deterministic_block is not None
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assert "overrides are blocked" in bundle.deterministic_block
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_snapshot_taken_before_a_navigation_is_stale() -> None:
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history = [
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{
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"type": "function_call",
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"name": "exec_command",
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"call_id": "snapshot-1",
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"arguments": '{"cmd":"agent-browser snapshot -i"}',
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},
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{
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"type": "function_call_output",
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"call_id": "snapshot-1",
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"output": '@e3 [button] "Search"',
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},
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{
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"type": "function_call",
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"name": "exec_command",
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"call_id": "navigate-1",
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"arguments": '{"cmd":"agent-browser navigate https://example.test/admin"}',
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},
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{"type": "function_call_output", "call_id": "navigate-1", "output": "ok"},
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]
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bundle = await _compile("agent-browser click @e3", turn_input=history)
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try:
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assert bundle.complete is False
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assert any("predates" in reason for reason in bundle.incomplete_reasons)
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finally:
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bundle.cleanup()
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@pytest.mark.asyncio
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async def test_reading_the_page_does_not_stale_a_snapshot() -> None:
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history = [
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{
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"type": "function_call",
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"name": "exec_command",
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"call_id": "snapshot-1",
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"arguments": '{"cmd":"agent-browser snapshot -i"}',
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},
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{
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"type": "function_call_output",
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"call_id": "snapshot-1",
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"output": '@e3 [button] "Search"',
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},
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{
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"type": "function_call",
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"name": "exec_command",
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"call_id": "get-1",
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"arguments": '{"cmd":"agent-browser get text @e3"}',
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},
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{"type": "function_call_output", "call_id": "get-1", "output": "Search"},
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]
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bundle = await _compile("agent-browser click @e3", turn_input=history)
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try:
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assert bundle.complete is True
|
|
assert bundle.packet["browser"]["latest_snapshot"]["stale"] is False
|
|
finally:
|
|
bundle.cleanup()
|
|
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_dependency_closure_may_exceed_one_file_limit() -> None:
|
|
settings = SafetySettings()
|
|
filler = "#" * (settings.max_artifact_bytes - 64)
|
|
bundle = await _compile(
|
|
"python /workspace/run.py",
|
|
{
|
|
"/workspace/run.py": f"import first\nimport second\n{filler}",
|
|
"/workspace/first.py": filler,
|
|
"/workspace/second.py": filler,
|
|
},
|
|
)
|
|
try:
|
|
assert bundle.complete is True
|
|
assert len(bundle.packet["artifacts"]) == 3
|
|
finally:
|
|
bundle.cleanup()
|
|
|
|
|
|
@pytest.mark.parametrize(
|
|
("command", "expected"),
|
|
[
|
|
("curl -X DELETE https://example.test/users/1", "DELETE"),
|
|
("curl --request PUT https://example.test/users/1", "PUT"),
|
|
("curl -d payload https://example.test/users", "-d"),
|
|
("wget --post-data=x https://example.test/users", "--post-data"),
|
|
],
|
|
)
|
|
def test_mutating_http_requests_are_recognized(command: str, expected: str) -> None:
|
|
assert expected in (parse_command(command).mutating_request or "")
|
|
|
|
|
|
def test_passive_http_requests_are_not_flagged() -> None:
|
|
assert parse_command("curl https://example.test/users").mutating_request is None
|
|
assert parse_command("curl -X GET https://example.test/users").mutating_request is None
|