Add probo-agent CLI and deviceagent library

Introduce the standalone device agent binary and shared library
for enrollment, posture checks, self-update, and OS service
integration. Include build targets, module deps, and release
workflow so the agent can ship independently of server changes.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/deviceagent/checks/checks_freebsd.go

@@ -0,0 +1,147 @@
+// Copyright (c) 2025-2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package checks
+
+import (
+	"context"
+	"os"
+	"strings"
+)
+
+func init() {
+	Register(KeyDiskEncryption, freebsdDiskEncryption)
+	Register(KeyScreenLock, freebsdScreenLock)
+	Register(KeyFirewallEnabled, freebsdFirewall)
+	Register(KeyTimeSync, freebsdTimeSync)
+	Register(KeyOSVersion, freebsdOSVersion)
+	Register(KeyAutoUpdate, freebsdAutoUpdate)
+	Register(KeyPasswordPolicy, freebsdPasswordPolicy)
+	Register(KeyRemoteLogin, freebsdRemoteLogin)
+	Register(KeyMalwareProtection, freebsdMalwareProtection)
+}
+
+func freebsdDiskEncryption(ctx context.Context) Result {
+	if !CommandExists("geli") {
+		return unknown(map[string]any{"note": "geli command not found"})
+	}
+	out := RunCommand(ctx, "geli", "status")
+	ev := map[string]any{"raw": out.Stdout, "stderr": out.Stderr}
+	if out.Err != nil {
+		return unknown(ev)
+	}
+	if strings.Contains(out.Stdout, "ACTIVE") {
+		return pass(ev)
+	}
+	return fail(ev)
+}
+
+func freebsdScreenLock(ctx context.Context) Result {
+	if CommandExists("xscreensaver-command") {
+		out := RunCommand(ctx, "xscreensaver-command", "-version")
+		if out.Err == nil {
+			return pass(map[string]any{"raw": out.Stdout})
+		}
+	}
+	return notApplicable(
+		map[string]any{
+			"note": "FreeBSD does not have a unified screen lock policy",
+		},
+	)
+}
+
+func freebsdFirewall(ctx context.Context) Result {
+	if !CommandExists("pfctl") {
+		return unknown(map[string]any{"note": "pfctl not found"})
+	}
+	out := RunCommand(ctx, "pfctl", "-si")
+	ev := map[string]any{"raw": truncate(out.Stdout, 400)}
+	if out.Err != nil {
+		return unknown(ev)
+	}
+	if strings.Contains(out.Stdout, "Status: Enabled") {
+		return pass(ev)
+	}
+	return fail(ev)
+}
+
+func freebsdTimeSync(ctx context.Context) Result {
+	out := RunCommand(ctx, "service", "ntpd", "status")
+	ev := map[string]any{"raw": out.Stdout, "stderr": out.Stderr}
+	if out.Err != nil {
+		return fail(ev)
+	}
+	if strings.Contains(strings.ToLower(out.Stdout), "is running") {
+		return pass(ev)
+	}
+	return fail(ev)
+}
+
+func freebsdOSVersion(ctx context.Context) Result {
+	out := RunCommand(ctx, "uname", "-r")
+	if out.Err != nil {
+		return unknown(map[string]any{"error": out.Err.Error()})
+	}
+	return pass(map[string]any{"release": out.Stdout})
+}
+
+func freebsdAutoUpdate(ctx context.Context) Result {
+	return notApplicable(
+		map[string]any{
+			"note": "FreeBSD relies on operator-driven freebsd-update",
+		},
+	)
+}
+
+func freebsdPasswordPolicy(ctx context.Context) Result {
+	data, err := os.ReadFile("/etc/login.conf")
+	if err != nil {
+		return unknown(map[string]any{"error": err.Error()})
+	}
+	body := string(data)
+	hasPolicy := strings.Contains(body, "minpasswordlen=") ||
+		strings.Contains(body, "passwordtime=")
+	ev := map[string]any{
+		"login_conf_snippet": truncate(body, 400),
+	}
+	if hasPolicy {
+		return pass(ev)
+	}
+	return fail(ev)
+}
+
+func freebsdMalwareProtection(ctx context.Context) Result {
+	if !CommandExists("clamd") && !CommandExists("clamdscan") {
+		return notApplicable(
+			map[string]any{
+				"note": "clamav not installed",
+			},
+		)
+	}
+	out := RunCommand(ctx, "service", "clamav_clamd", "status")
+	ev := map[string]any{"raw": out.Stdout}
+	if strings.Contains(strings.ToLower(out.Stdout), "is running") {
+		return pass(ev)
+	}
+	return fail(ev)
+}
+
+func freebsdRemoteLogin(ctx context.Context) Result {
+	out := RunCommand(ctx, "service", "sshd", "status")
+	ev := map[string]any{"raw": out.Stdout}
+	if strings.Contains(strings.ToLower(out.Stdout), "is running") {
+		return fail(ev)
+	}
+	return pass(ev)
+}