falco: create hardlink over sensitive file event added

Signed-off-by: praveen-rikhari <praveenrikhari45@gmail.com>

events/syscall/create_hardlink_over_sensitive_files.go

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+Copyright (C) 2024 The Falco Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package syscall
+
+import (
+	"os"
+	"os/exec"
+
+	"github.com/falcosecurity/event-generator/events"
+)
+
+var _ = events.Register(CreateHardlinkOverSensitiveFiles)
+
+func CreateHardlinkOverSensitiveFiles(h events.Helper) error {
+	path, err := exec.LookPath("ln")
+	if err != nil {
+		// if we don't have a ln, just bail
+		return &events.ErrSkipped{
+			Reason: "ln utility not found in path",
+		}
+	}
+
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "event-generator-syscall-CreateHardlinkOverSensitiveFiles")
+	if err != nil {
+		return err
+	}
+	defer os.ReadDir(tmpDir)
+
+	cmd := exec.Command(path, "-v", "/etc", tmpDir+"/etc_link")
+	return cmd.Run()
+}