CrowdSec's host-side install (the agent + nftables bouncer the LibrePortal
Traefik plugin talks to) had stayed on blanket sudo throughout the rootless +
de-sudo hardening: `sudo apt-get install crowdsec`, `curl | sudo bash`,
`sudo sed -i /etc/crowdsec/config.yaml`, `sudo touch + sudo chmod /var/log/
crowdsec*.log`, `echo $key | sudo tee /etc/crowdsec/traefik_bouncer.key`,
plus `sudo cscli capi register / console enroll / bouncers add`. None of
those are in the scoped LP_HELPERS / LP_SYSTEM sudoers grant the manager
now holds, so any user who enabled crowdsec would have hit hard sudo
failures on every privileged step.
Follow the libreportal-appcfg / libreportal-bininstall pattern: one new
root-owned helper at /usr/local/lib/libreportal/libreportal-crowdsec
that does every privileged op behind a fixed action vocabulary with strict
argument validation. The manager calls in via runCrowdsec — the scoped
sudoers grants exactly one binary, the same trust boundary the other
helpers rely on.
Actions:
install apt repo + agent + firewall-bouncer + enable +
crowdsecurity/{linux,sshd} collections + reload
(idempotent — skips parts already in place)
services <verb> enable | disable | restart
capi <verb> register | unregister | status
console <verb> enroll <token> | disenroll | status
token format strictly validated
bouncer-traefik-init cscli register + write the manager-owned key file
atomically (returns EXISTS or GENERATED:<key>)
bouncer-priority bouncer yaml nftables priority → -100
(moved from libreportal-appcfg; one helper for
every crowdsec root op)
bind-lapi flip listen_uri to 0.0.0.0:8080 in config.yaml
prometheus <on…|off> flip the prometheus block (validated addr/port)
touch-host-logs create + chmod 0644 /var/log/crowdsec*.log so the
libreportal container can tail them
Wired in via:
- new sudoers Cmnd_Alias entry for the helper in LP_HELPERS
- new helper baked alongside the others by initRootHelpers
(replaces __SYSTEM_DIR__ / __CONTAINERS_DIR__ / __MANAGER__ at
install, with safe runtime fallbacks if unbaked)
- new runCrowdsec dispatch in scripts/docker/command/run_privileged.sh
containers/crowdsec/scripts/crowdsec_install_host.sh now drives the whole
flow through runCrowdsec — every `sudo …` is gone, the compose-toggle sed
uses runFileOp, and the security_crowdsec CFG mirror uses runInstallOp
(configs/ is manager-owned). Net: install script shrinks ~80 lines while
gaining a single auditable trust boundary. crowdsec_fix_priority.sh swung
over to runCrowdsec bouncer-priority too — the appcfg crowdsec_priority
action drops out cleanly.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
librelad