261e2ee862
The ContextVar migration removed 'from pathlib import Path' but Path is still used in _load_config_passthrough(). Without this import, config-based env passthrough would raise NameError.
113 lines
3.9 KiB
Python
113 lines
3.9 KiB
Python
"""Environment variable passthrough registry.
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Skills that declare ``required_environment_variables`` in their frontmatter
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need those vars available in sandboxed execution environments (execute_code,
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terminal). By default both sandboxes strip secrets from the child process
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environment for security. This module provides a session-scoped allowlist
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so skill-declared vars (and user-configured overrides) pass through.
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Two sources feed the allowlist:
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1. **Skill declarations** — when a skill is loaded via ``skill_view``, its
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``required_environment_variables`` are registered here automatically.
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2. **User config** — ``terminal.env_passthrough`` in config.yaml lets users
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explicitly allowlist vars for non-skill use cases.
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Both ``code_execution_tool.py`` and ``tools/environments/local.py`` consult
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:func:`is_env_passthrough` before stripping a variable.
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"""
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from __future__ import annotations
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import logging
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import os
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from contextvars import ContextVar
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from pathlib import Path
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from typing import Iterable
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logger = logging.getLogger(__name__)
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# Session-scoped set of env var names that should pass through to sandboxes.
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# Backed by ContextVar to prevent cross-session data bleed in the gateway pipeline.
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_allowed_env_vars_var: ContextVar[set[str]] = ContextVar("_allowed_env_vars")
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def _get_allowed() -> set[str]:
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"""Get or create the allowed env vars set for the current context/session."""
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try:
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return _allowed_env_vars_var.get()
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except LookupError:
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val: set[str] = set()
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_allowed_env_vars_var.set(val)
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return val
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# Cache for the config-based allowlist (loaded once per process).
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_config_passthrough: frozenset[str] | None = None
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def register_env_passthrough(var_names: Iterable[str]) -> None:
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"""Register environment variable names as allowed in sandboxed environments.
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Typically called when a skill declares ``required_environment_variables``.
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"""
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for name in var_names:
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name = name.strip()
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if name:
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_get_allowed().add(name)
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logger.debug("env passthrough: registered %s", name)
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def _load_config_passthrough() -> frozenset[str]:
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"""Load ``tools.env_passthrough`` from config.yaml (cached)."""
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global _config_passthrough
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if _config_passthrough is not None:
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return _config_passthrough
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result: set[str] = set()
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try:
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hermes_home = Path(os.environ.get("HERMES_HOME", Path.home() / ".hermes"))
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config_path = hermes_home / "config.yaml"
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if config_path.exists():
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import yaml
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with open(config_path) as f:
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cfg = yaml.safe_load(f) or {}
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passthrough = cfg.get("terminal", {}).get("env_passthrough")
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if isinstance(passthrough, list):
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for item in passthrough:
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if isinstance(item, str) and item.strip():
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result.add(item.strip())
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except Exception as e:
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logger.debug("Could not read tools.env_passthrough from config: %s", e)
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_config_passthrough = frozenset(result)
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return _config_passthrough
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def is_env_passthrough(var_name: str) -> bool:
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"""Check whether *var_name* is allowed to pass through to sandboxes.
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Returns ``True`` if the variable was registered by a skill or listed in
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the user's ``tools.env_passthrough`` config.
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"""
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if var_name in _get_allowed():
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return True
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return var_name in _load_config_passthrough()
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def get_all_passthrough() -> frozenset[str]:
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"""Return the union of skill-registered and config-based passthrough vars."""
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return frozenset(_get_allowed()) | _load_config_passthrough()
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def clear_env_passthrough() -> None:
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"""Reset the skill-scoped allowlist (e.g. on session reset)."""
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_get_allowed().clear()
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def reset_config_cache() -> None:
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"""Force re-read of config on next access (for testing)."""
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global _config_passthrough
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_config_passthrough = None
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