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Add file integrity monitoring (Tripwire-style), auto-refreshed via pacman hook

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Detects binary/config tampering by content hash — catching a malicious swap
even when mtime is preserved (the gap in mtime-based persistence checks). Two
engines split by file ownership:

- fim.py hash baseline: SHA-256 (+ mode/uid/gid/size) of security-critical
  files the package manager doesn't track (/usr/local, /etc configs, systemd
  units, SSH keys). The baseline refreshes ONLY via fim-update / the pacman
  hook, so a flagged change stays flagged until acknowledged (Tripwire
  semantics). Alerts: fim_modified 100017 / fim_added 100018 / fim_removed 100019.
- package verification: `pacman -Qkk` checks package-owned binaries against the
  distro's own signed checksums — no baseline to maintain, implicitly current
  because the package DB updates on every upgrade. fim_pkg_modified 100020.

Auto-update on system updates: a pacman PostTransaction hook runs
`enodia-sentinel fim-update` after every install/upgrade/remove, so legitimate
package changes never alert — no manual `tripwire --update`.

- daemon: backgrounded FIM scan + optional pkg-verify on slow cadences, feeding
  the normal alert/snapshot/push pipeline; baseline loaded/built at startup
- cli: fim-baseline / fim-update / fim-check [--packages]
- config: fim_enabled, fim_paths, fim_scan_interval, fim_pkg_verify[_interval]
- packaging: ship + install the pacman hook (Makefile + PKGBUILD)
- tests: +7 (hashing, diff incl. mtime-preserving tamper, pacman -Qkk parse).
  72/72 pass. Verified end-to-end: a content swap with preserved mtime is caught.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Luna 2026-05-31 22:18:42 -07:00
parent 07f5261d59
commit 5d577b624f
12 changed files with 467 additions and 3 deletions
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2
Makefile
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@ -16,6 +16,7 @@ install:
install -Dm755 src/sentinel-redteam $(DESTDIR)$(BINDIR)/sentinel-redteam
install -Dm644 systemd/enodia-sentinel.service $(DESTDIR)$(SYSTEMDDIR)/enodia-sentinel.service
install -Dm644 systemd/enodia-sentinel-web.service $(DESTDIR)$(SYSTEMDDIR)/enodia-sentinel-web.service
install -Dm644 packaging/enodia-sentinel-fim.hook $(DESTDIR)/etc/pacman.d/hooks/enodia-sentinel-fim.hook
@if [ ! -e "$(DESTDIR)$(CONFDIR)/enodia-sentinel.toml" ]; then \
install -Dm644 config/enodia-sentinel.toml $(DESTDIR)$(CONFDIR)/enodia-sentinel.toml; \
echo "Installed default config at $(CONFDIR)/enodia-sentinel.toml"; \
@ -32,6 +33,7 @@ uninstall:
rm -f $(DESTDIR)$(BINDIR)/sentinel-redteam
rm -f $(DESTDIR)$(SYSTEMDDIR)/enodia-sentinel.service
rm -f $(DESTDIR)$(SYSTEMDDIR)/enodia-sentinel-web.service
rm -f $(DESTDIR)/etc/pacman.d/hooks/enodia-sentinel-fim.hook
rm -f $(DESTDIR)$(CONFDIR)/enodia-sentinel.toml.new
@echo "Uninstalled. Config and logs preserved."