The tracking.log read was still returning empty under enforcing with NO AVC —
the tell of a DAC (not SELinux) denial. Root cause: /var/log/chrony is mode
0750 chrony:chrony (others have no access), so the agent's DynamicUser (group
tss only) can't even traverse the directory to reach the 0644 tracking.log —
EACCES on open, which produces no audit record. Manager confirmed genuinely on
fleet-manager-1db3977 (chrony-capable), and uptime flowed while chrony didn't,
proving the agent was sending empty chrony (failed read), not a manager gap.
Earlier manual reads worked only as root (sudo) or because fleetadmin had been
usermod'd into chrony during the socket test (reverted on reboot — /etc/group
is on the volatile overlay).
Fix: SupplementaryGroups=tss chrony on the unit — the chrony group has r-x on
the 0750 dir so the agent can traverse it; the log file is world-readable. This
is the DAC half; the fleet_agent_chronylog SELinux module (02a6621) is the TE
half — BOTH are required (verified: group-only -> TE-denied; module-only ->
DAC-denied silently). Corrected the now-stale 'no group' code comment; recorded
the two-layer requirement in the .te and stig-deviations #16. Needs a
workstation image rebuild + reboot.
Build the on-host agent that pairs with fleet-hostapi and feeds the
fleet-manager control plane (TODO #14 "STILL TO BUILD (a)"). Nothing on the
workstation talked to the manager before this; Monitor + InfluxDB stayed empty.
Scope: telemetry only. The agent reuses the host TPM identity for mTLS (read-only
tpmkey.LoadSigner at 0x81000100 + cert from NV 0x01800100; the private key never
leaves the TPM), opens the long-lived FleetAgent.Session bidi stream, sends Hello
+ periodic HealthSnapshot (load/cpu/temp/mem/tmpfs/nvme/auth/selinux/chrony/kiosk,
probed read-only from /proc+/sys plus hostapi facts), and LOGS but does not act on
the DesiredState/Command it receives. Reconcile actuators (kiosk URL, reboot,
drain) are deferred until the telemetry half is bench-verified.
- files/agent/: new module (go-tpm + grpc), static CGO_ENABLED=0 like enrol/hostapi.
Copies the enrol tpmkey (+ read-only LoadSigner) and the generated fleet.agent.v1
proto so it stays self-contained without importing the initramfs enrol module.
- files/agent/simtest/: proves the TPM-signed cert completes a real mTLS client-auth
handshake (RequireAndVerifyClientCert) against the go-tpm software simulator.
- files/etc/fleet-agent/agent.env: fleet-generic config (manager DNS name, fleet CA
reused from radius-ca.pem, TPM handle/nvindex, interval). No per-host state.
- fleet-agent.service: hardened unit (tss group for /dev/tpmrm0, INET egress).
- CI builds fleet-agent out-of-VM + runs vet/test + the simulator handshake test.
- Packer: enable_agent flag (default on) + 2b-agent provisioner + fapolicyd trust.
Post-switch-root only, so no dracut/initramfs changes.
- docs: TODO #14 + fleet-management-design as-built updated.
Requires the host already enrolled (broker approve births the inventory row) —
else the manager returns PermissionDenied, the correct "not enrolled yet" signal.
Audiobuzz