Three rounds of audit-driven hardening, fully documented in DECISIONS.md:
- argv hardening: validate HostName/User/IdentityFile via allowlist regexes,
parse Port via strconv.Atoi, surface ssh_config parse errors instead of
silently swallowing them. Switch -o kernel_cache to auto_cache for network-
FS correctness, pin StrictHostKeyChecking=accept-new.
- LOW-severity cleanup: -v verbose flag (default output is just the mount
path), run_editor returns errors and main exits 7 on failure, ABOUTME
headers, golang.org/x/sys v0.43.0 (go 1.25.0).
- Defense-in-depth + UX: rxIdentityFile first-character anchor rejects
leading "-"/"."/":"/etc., verify_mount_dir resolves base via EvalSymlinks
and refuses pre-existing symlinks at the mount path, flag.Usage shows the
positional <Host> argument, run_editor uses cmd.Start() so cold-start
Sublime does not block the terminal.
- CI: empty-PKGVER guard in update-pkgver workflow.
- Tests: verify_mount_dir path-traversal + symlink-reject coverage,
rxHostUser/rxIdentityFile boundary cases.
