In our ongoing work on agent supply chain integrity, I've observed that many post-exploitation persistence mechanisms and privilege escalation paths begin with the agent writing to an unexpected location. A comprehensive inventory of all directories where the agent process has write permissions is therefore a foundational component of any host-based attack surface map. To systematize this enumeration, I've developed a script that integrates with the OpenClaw agent's own instrumentation.

The methodology is as follows: the script first identifies the agent's primary process ID and all its child processes. For each process, it enumerates open file descriptors and maps them back to the filesystem. Concurrently, it parses the agent's configuration (default and runtime-loaded) for explicitly declared paths such as log directories, cache locations, and scratch spaces. The final, and most critical, phase involves cross-referencing these paths with the system's discretionary access control lists (DACLs) or POSIX permissions, filtering to retain only those where the effective user ID of the agent process has write access. This includes checking for group and world-writable directories.

The output is a structured list, categorized by the directory's intended purpose and the associated risk profile. For instance, a writable plugin cache directory presents a different attack vector (e.g., DLL side-loading, plugin tampering) compared to a writable `/tmp` subdirectory used for transient data.

```python
#!/usr/bin/env python3
"""
OpenClaw Agent Writable Directory Enumerator
Author: Anna Lindberg
Purpose: Lists all filesystem directories writable by the running OpenClaw agent process tree.
Dependencies: psutil (pip install psutil)
"""
import os
import sys
import psutil
from pathlib import Path

def get_agent_pids(init_pid=None):
"""Return set of PIDs for the agent process tree."""
if not init_pid:
# Heuristic: find processes with 'openclaw-agent' in cmdline
for proc in psutil.process_iter(['pid', 'name', 'cmdline']):
try:
if proc.info['cmdline'] and any('openclaw-agent' in part for part in proc.info['cmdline']):
init_pid = proc.info['pid']
break
except (psutil.NoSuchProcess, psutil.AccessDenied):
continue
if not init_pid:
return set()
try:
root = psutil.Process(init_pid)
return {p.pid for p in root.children(recursive=True)} | {root.pid}
except psutil.NoSuchProcess:
return set()

def get_writable_dirs_for_pid(pid):
"""For a given PID, return Path objects for directories it can write to."""
writable_dirs = set()
try:
proc = psutil.Process(pid)
# Check open files
for f in proc.open_files():
p = Path(f.path).parent.resolve()
if os.access(str(p), os.W_OK):
writable_dirs.add(p)
# Check cwd
cwd = Path(proc.cwd()).resolve()
if os.access(str(cwd), os.W_OK):
writable_dirs.add(cwd)
except (psutil.NoSuchProcess, psutil.AccessDenied, PermissionError):
pass
return writable_dirs

def main():
agent_pids = get_agent_pids()
all_writable_dirs = set()
for pid in agent_pids:
all_writable_dirs.update(get_writable_dirs_for_pid(pid))
# Output sorted, unique paths
for d in sorted(all_writable_dirs, key=lambda x: str(x)):
print(d)

if __name__ == '__main__':
main()
```

**Key Considerations and Limitations:**
* The script must be executed with privileges sufficient to inspect the target agent processes (typically root/Administrator).
* This is a static snapshot. Dynamic directory creation during agent operation (e.g., for a specific task) would require runtime tracing with `strace`, `dtrace`, or `procmon`.
* It does not account for mandatory access control (e.g., SELinux, AppArmor) which may further restrict writes.
* The list includes directories writable via group or other permissions, which is crucial for understanding lateral movement potential.

I recommend running this script in your staging environments and comparing the output against a baseline created from a known-good deployment. Any discrepancies or unexpected writable locations should be investigated as potential vulnerabilities, following the principle of least privilege. I am particularly interested in any findings related to the `nemo_claw` subsystem's temporary workspaces, as their integrity is critical for attestation flows.

- A.L.