Replace fs_usage (reports Mach thread IDs, requiring process name matching
with false positives) with eslogger (Endpoint Security framework, reports
real Unix PIDs via audit_token.pid plus fork events for process tree tracking).
Key changes:
- Daemon starts eslogger instead of fs_usage, with early-exit detection
and clear Full Disk Access error messaging
- New two-pass eslogger JSON parser: pass 1 builds PID tree from fork
events, pass 2 filters filesystem events by PID set
- Remove runtime PID polling (StartPIDTracking, pollDescendantPIDs) —
process tree is now built post-hoc from the eslogger log
- Platform-specific generateLearnedTemplatePlatform() for darwin/linux/stub
- Refactor TraceResult and GenerateLearnedTemplate to be platform-agnostic
- Add daemon CLI subcommand (install/uninstall/status/run)
- Download tun2socks for darwin platforms in Makefile
- Export ExtractTun2Socks and add darwin embed support
- Use group-based pf filtering instead of user-based for transparent
proxying
- Install sudoers rule for passwordless sandbox-exec with _greywall
group
- Add nolint directives for gosec false positives on sudoers 0440 perms
- Fix lint issues: lowercase errors, fmt.Fprintf, nolint comments
Sandboxed commands previously ran as `sudo -u _greywall`, breaking user
identity (home dir, SSH keys, git config). Now uses `sudo -u #<uid> -g
_greywall` so the process keeps the real user's identity while pf
matches
on EGID for traffic routing.
Key changes:
- pf rules use `group <GID>` instead of `user _greywall`
- GID resolved dynamically at daemon startup (not hardcoded, since macOS
system groups like com.apple.access_ssh may claim preferred IDs)
- Sudoers rule installed at /etc/sudoers.d/greywall (validated with
visudo)
- Invoking user added to _greywall group via dscl (not dseditgroup,
which
clobbers group attributes)
- tun2socks device discovery scans both stdout and stderr (fixes 10s
timeout caused by STACK message going to stdout)
- Always-on daemon logging for session create/destroy events
