Add process validation for peer metadata

management/server/posture/process.go

@@ -1,6 +1,9 @@
 package posture
 
 import (
+	"fmt"
+	"slices"
+
 	nbpeer "github.com/netbirdio/netbird/management/server/peer"
 )
 
@@ -16,7 +19,29 @@ type ProcessCheck struct {
 var _ Check = (*ProcessCheck)(nil)
 
 func (p *ProcessCheck) Check(peer nbpeer.Peer) (bool, error) {
-	return false, nil
+	peerActiveProcesses := make([]string, 0, len(peer.Meta.Processes))
+	for _, process := range peer.Meta.Processes {
+		peerActiveProcesses = append(peerActiveProcesses, process.Path)
+	}
+
+	switch peer.Meta.GoOS {
+	case "darwin", "linux":
+		for _, process := range p.Processes {
+			if !slices.Contains(peerActiveProcesses, process.Path) {
+				return false, nil
+			}
+		}
+		return true, nil
+	case "windows":
+		for _, process := range p.Processes {
+			if !slices.Contains(peerActiveProcesses, process.WindowsPath) {
+				return false, nil
+			}
+		}
+		return true, nil
+	default:
+		return false, fmt.Errorf("unsupported peer's operating system: %s", peer.Meta.GoOS)
+	}
 }
 
 func (p *ProcessCheck) Name() string {