event on update_package_repository

Signed-off-by: h4l0gen <[email protected]> commits squashed Signed-off-by: h4l0gen <[email protected]>
falcosecurity · Apr 24, 2024 · d751e15 · d751e15
1 parent 31789dc
commit d751e15
Showing 1 changed file with 51 additions and 0 deletions.
diff --git a/events/syscall/update_package_repository.go b/events/syscall/update_package_repository.go
@@ -0,0 +1,51 @@
+// 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"
+
+	"github.com/falcosecurity/event-generator/events"
+)
+
+var _ = events.Register(
+	UpdatePackageRepository,
+	events.WithDisabled(), // this rules is not included in falco_rules.yaml (stable rules), so disable the action
+)
+
+func UpdatePackageRepository(h events.Helper) error {
+	path := "/etc/apt/sources.list"
+
+	// Check if the file exists
+	if _, err := os.Stat(path); err != nil {
+		// If the file doesn't exist, create it and open it in write only mode
+		file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, os.FileMode(0755))
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+		// Remove file after closing it to free file occupied space
+		os.Remove(path)
+
+	} else {
+		// If the file exists, open it for writing
+		file, err := os.OpenFile(path, os.O_WRONLY, os.FileMode(0755))
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+	}
+
+	return nil
+}