Added an event for default rule "Adding ssh keys to authorized_keys"

events/syscall/adding_ssh_keys_to_authorized_keys.go

@@ -0,0 +1,42 @@
+// 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"
+	"path/filepath"
+
+	"github.com/falcosecurity/event-generator/events"
+)
+
+var _ = events.Register(
+	AddingSshKeysToAuthorizedKeys,
+	events.WithDisabled(), // this rules is not included in falco_rules.yaml (stable rules), so disable the action
+)
+
+func AddingSshKeysToAuthorizedKeys(h events.Helper) error {
+	// Creates .ssh directory inside tempDirectory
+	sshDir, cleanup, err := createSshDirectoryUnderHome()
+	if err != nil {
+		return err
+	}
+	defer cleanup() // Cleanup after function return
+
+	filename := filepath.Join(sshDir, "authorized_keys")
+	h.Log().Infof("writing to %s", filename)
+
+	// Create authorized_keys file, and write into it
+	return os.WriteFile(filename, []byte("ssh-rsa <ssh_public_key>\n"), os.FileMode(0755))
+}