adding an event on triggering rule disallowed ssh connection

events/syscall/disallowed_ssh_connection.go

@@ -0,0 +1,41 @@
+// 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 (
+	"github.com/falcosecurity/event-generator/events"
+	"os/exec"
+)
+
+var _ = events.Register(
+	DisallowedSSHConnection,
+	events.WithDisabled(), // this rule is not included in falco_rules.yaml (stable rules), so disable the action
+)
+
+func DisallowedSSHConnection(h events.Helper) error {
+	path, err := exec.LookPath("ssh")
+	if err != nil {
+		// If we don't have an SSH, just bail
+		return &events.ErrSkipped{
+			Reason: "ssh utility not found in path",
+		}
+	}
+	cmd := exec.Command("timeout", "1s", path, "[email protected]", "-p", "22")
+	err = cmd.Run()
+	if err != nil {
+		return err
+	}
+	return nil
+}