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https://github.com/NousResearch/hermes-agent.git
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d7a1052424
When tools.environments.local can't be imported (partial install, import-time error), _is_hermes_provider_credential() returned False — fail-open. A skill could then register a Hermes provider credential (ANTHROPIC_API_KEY, etc.) as env passthrough; _scrub_child_env lets passthrough vars bypass the secret-substring net (rule 1), so the operator's real key would land in the execute_code child. Reopens the GHSA-rhgp-j443-p4rf bypass. Fail closed instead: on import failure, treat the name as a protected provider credential and refuse passthrough. Regression test exercises the full register -> scrub path under a simulated import failure. Co-authored-by: Hermes Agent <noreply@nousresearch.com>
279 lines
11 KiB
Python
279 lines
11 KiB
Python
"""Tests for tools.env_passthrough — skill and config env var passthrough."""
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import os
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import pytest
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import yaml
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import tools.env_passthrough as _ep_mod
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from tools.env_passthrough import (
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clear_env_passthrough,
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get_all_passthrough,
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is_env_passthrough,
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register_env_passthrough,
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)
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@pytest.fixture(autouse=True)
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def _clean_passthrough():
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"""Ensure a clean passthrough state for every test."""
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clear_env_passthrough()
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_ep_mod._config_passthrough = None
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yield
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clear_env_passthrough()
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_ep_mod._config_passthrough = None
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class TestSkillScopedPassthrough:
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def test_register_and_check(self):
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assert not is_env_passthrough("TENOR_API_KEY")
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register_env_passthrough(["TENOR_API_KEY"])
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assert is_env_passthrough("TENOR_API_KEY")
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def test_register_multiple(self):
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register_env_passthrough(["FOO_TOKEN", "BAR_SECRET"])
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assert is_env_passthrough("FOO_TOKEN")
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assert is_env_passthrough("BAR_SECRET")
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assert not is_env_passthrough("OTHER_KEY")
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def test_clear(self):
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register_env_passthrough(["TENOR_API_KEY"])
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assert is_env_passthrough("TENOR_API_KEY")
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clear_env_passthrough()
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assert not is_env_passthrough("TENOR_API_KEY")
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def test_get_all(self):
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register_env_passthrough(["A_KEY", "B_TOKEN"])
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result = get_all_passthrough()
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assert "A_KEY" in result
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assert "B_TOKEN" in result
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def test_strips_whitespace(self):
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register_env_passthrough([" SPACED_KEY "])
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assert is_env_passthrough("SPACED_KEY")
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def test_skips_empty(self):
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register_env_passthrough(["", " ", "VALID_KEY"])
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assert is_env_passthrough("VALID_KEY")
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assert not is_env_passthrough("")
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class TestConfigPassthrough:
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def test_reads_from_config(self, tmp_path, monkeypatch):
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config = {"terminal": {"env_passthrough": ["MY_CUSTOM_KEY", "ANOTHER_TOKEN"]}}
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config_path = tmp_path / "config.yaml"
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config_path.write_text(yaml.dump(config))
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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_ep_mod._config_passthrough = None
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assert is_env_passthrough("MY_CUSTOM_KEY")
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assert is_env_passthrough("ANOTHER_TOKEN")
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assert not is_env_passthrough("UNRELATED_VAR")
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def test_empty_config(self, tmp_path, monkeypatch):
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config = {"terminal": {"env_passthrough": []}}
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config_path = tmp_path / "config.yaml"
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config_path.write_text(yaml.dump(config))
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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_ep_mod._config_passthrough = None
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assert not is_env_passthrough("ANYTHING")
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def test_missing_config_key(self, tmp_path, monkeypatch):
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config = {"terminal": {"backend": "local"}}
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config_path = tmp_path / "config.yaml"
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config_path.write_text(yaml.dump(config))
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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_ep_mod._config_passthrough = None
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assert not is_env_passthrough("ANYTHING")
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def test_no_config_file(self, tmp_path, monkeypatch):
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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_ep_mod._config_passthrough = None
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assert not is_env_passthrough("ANYTHING")
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def test_union_of_skill_and_config(self, tmp_path, monkeypatch):
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config = {"terminal": {"env_passthrough": ["CONFIG_KEY"]}}
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config_path = tmp_path / "config.yaml"
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config_path.write_text(yaml.dump(config))
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monkeypatch.setenv("HERMES_HOME", str(tmp_path))
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_ep_mod._config_passthrough = None
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register_env_passthrough(["SKILL_KEY"])
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all_pt = get_all_passthrough()
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assert "CONFIG_KEY" in all_pt
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assert "SKILL_KEY" in all_pt
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class TestExecuteCodeIntegration:
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"""Verify that the passthrough is checked in execute_code's env filtering."""
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def test_secret_substring_blocked_by_default(self):
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"""TENOR_API_KEY should be blocked without passthrough."""
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_SAFE_ENV_PREFIXES = ("PATH", "HOME", "USER", "LANG", "LC_", "TERM",
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"TMPDIR", "TMP", "TEMP", "SHELL", "LOGNAME",
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"XDG_", "PYTHONPATH", "VIRTUAL_ENV", "CONDA")
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_SECRET_SUBSTRINGS = ("KEY", "TOKEN", "SECRET", "PASSWORD", "CREDENTIAL",
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"PASSWD", "AUTH")
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test_env = {"PATH": "/usr/bin", "TENOR_API_KEY": "test123", "HOME": "/home/user"}
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child_env = {}
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for k, v in test_env.items():
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if is_env_passthrough(k):
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child_env[k] = v
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continue
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if any(s in k.upper() for s in _SECRET_SUBSTRINGS):
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continue
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if any(k.startswith(p) for p in _SAFE_ENV_PREFIXES):
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child_env[k] = v
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assert "PATH" in child_env
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assert "HOME" in child_env
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assert "TENOR_API_KEY" not in child_env
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def test_passthrough_allows_secret_through(self):
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"""TENOR_API_KEY should pass through when registered."""
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_SAFE_ENV_PREFIXES = ("PATH", "HOME", "USER", "LANG", "LC_", "TERM",
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"TMPDIR", "TMP", "TEMP", "SHELL", "LOGNAME",
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"XDG_", "PYTHONPATH", "VIRTUAL_ENV", "CONDA")
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_SECRET_SUBSTRINGS = ("KEY", "TOKEN", "SECRET", "PASSWORD", "CREDENTIAL",
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"PASSWD", "AUTH")
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register_env_passthrough(["TENOR_API_KEY"])
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test_env = {"PATH": "/usr/bin", "TENOR_API_KEY": "test123", "HOME": "/home/user"}
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child_env = {}
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for k, v in test_env.items():
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if is_env_passthrough(k):
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child_env[k] = v
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continue
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if any(s in k.upper() for s in _SECRET_SUBSTRINGS):
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continue
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if any(k.startswith(p) for p in _SAFE_ENV_PREFIXES):
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child_env[k] = v
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assert "PATH" in child_env
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assert "HOME" in child_env
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assert "TENOR_API_KEY" in child_env
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assert child_env["TENOR_API_KEY"] == "test123"
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class TestTerminalIntegration:
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"""Verify that the passthrough is checked in terminal's env sanitizers."""
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def test_blocklisted_var_blocked_by_default(self):
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from tools.environments.local import _sanitize_subprocess_env, _HERMES_PROVIDER_ENV_BLOCKLIST
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# Pick a var we know is in the blocklist
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blocked_var = next(iter(_HERMES_PROVIDER_ENV_BLOCKLIST))
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env = {blocked_var: "secret_value", "PATH": "/usr/bin"}
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result = _sanitize_subprocess_env(env)
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assert blocked_var not in result
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assert "PATH" in result
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def test_passthrough_cannot_override_provider_blocklist(self):
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"""GHSA-rhgp-j443-p4rf: register_env_passthrough must NOT accept
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Hermes provider credentials — that was the bypass where a skill
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could declare ANTHROPIC_TOKEN / OPENAI_API_KEY as passthrough and
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defeat the execute_code sandbox scrubbing."""
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from tools.environments.local import (
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_sanitize_subprocess_env,
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_HERMES_PROVIDER_ENV_BLOCKLIST,
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)
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blocked_var = next(iter(_HERMES_PROVIDER_ENV_BLOCKLIST))
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# Attempt to register — must be silently refused (logged warning).
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register_env_passthrough([blocked_var])
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# is_env_passthrough must NOT report it as allowed
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assert not is_env_passthrough(blocked_var)
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# Sanitizer still strips the var from subprocess env
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env = {blocked_var: "secret_value", "PATH": "/usr/bin"}
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result = _sanitize_subprocess_env(env)
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assert blocked_var not in result
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assert "PATH" in result
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def test_make_run_env_blocklist_override_rejected(self):
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"""_make_run_env must NOT expose a blocklisted var to subprocess env
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even after a skill attempts to register it via passthrough."""
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from tools.environments.local import (
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_make_run_env,
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_HERMES_PROVIDER_ENV_BLOCKLIST,
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)
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blocked_var = next(iter(_HERMES_PROVIDER_ENV_BLOCKLIST))
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os.environ[blocked_var] = "secret_value"
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try:
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# Without passthrough — blocked
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result_before = _make_run_env({})
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assert blocked_var not in result_before
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# Skill tries to register it — must be refused, so still blocked
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register_env_passthrough([blocked_var])
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result_after = _make_run_env({})
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assert blocked_var not in result_after
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finally:
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os.environ.pop(blocked_var, None)
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def test_non_hermes_api_key_still_registerable(self):
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"""Third-party API keys (TENOR_API_KEY, NOTION_TOKEN, etc.) are NOT
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Hermes provider credentials and must still pass through — skills
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that legitimately wrap third-party APIs must keep working."""
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# TENOR_API_KEY is a real example — used by the gif-search skill
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register_env_passthrough(["TENOR_API_KEY"])
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assert is_env_passthrough("TENOR_API_KEY")
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# Arbitrary skill-specific var
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register_env_passthrough(["MY_SKILL_CUSTOM_CONFIG"])
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assert is_env_passthrough("MY_SKILL_CUSTOM_CONFIG")
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def test_provider_blocklist_import_failure_fails_closed(self, monkeypatch):
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"""If the dynamic provider blocklist can't be imported, provider
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credentials must be treated as protected and refused passthrough —
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otherwise a skill could tunnel a Hermes credential into the
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execute_code child (regression for #37950 / GHSA-rhgp-j443-p4rf).
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Verifies the full path: _is_hermes_provider_credential returns True,
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register_env_passthrough refuses the var, and _scrub_child_env keeps
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it out of the child env. A non-Hermes key is also rejected here (the
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fallback is conservative: when we can't tell, we fail closed), which
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is the safe direction.
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"""
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import builtins
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from tools.code_execution_tool import _scrub_child_env
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real_import = builtins.__import__
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def fail_local_import(name, *args, **kwargs):
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if name == "tools.environments.local":
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raise ImportError("synthetic blocklist import failure")
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return real_import(name, *args, **kwargs)
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monkeypatch.setattr(builtins, "__import__", fail_local_import)
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# Every name is now treated as a protected provider credential.
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assert _ep_mod._is_hermes_provider_credential("OPENAI_API_KEY")
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assert _ep_mod._is_hermes_provider_credential("ANTHROPIC_API_KEY")
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assert _ep_mod._is_hermes_provider_credential("GH_TOKEN")
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# Registration is refused while the blocklist is unavailable.
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register_env_passthrough(["OPENAI_API_KEY", "ANTHROPIC_API_KEY"])
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assert not is_env_passthrough("OPENAI_API_KEY")
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assert not is_env_passthrough("ANTHROPIC_API_KEY")
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# And the credential never reaches the execute_code child.
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child_env = _scrub_child_env(
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{
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"OPENAI_API_KEY": "synthetic-secret",
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"ANTHROPIC_API_KEY": "synthetic-secret",
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"PATH": "/usr/bin",
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},
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is_passthrough=is_env_passthrough,
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is_windows=False,
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)
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assert "OPENAI_API_KEY" not in child_env
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assert "ANTHROPIC_API_KEY" not in child_env
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assert child_env["PATH"] == "/usr/bin"
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