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adding an event on unexpected_k8s_nodeport_connection
Signed-off-by: h4l0gen <ks3913688@gmail.com> adding an event on unexpected_k8s_nodeport_connection Signed-off-by: h4l0gen <ks3913688@gmail.com> final Signed-off-by: h4l0gen <ks3913688@gmail.com>
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// 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 | ||
|
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import ( | ||
"fmt" | ||
"github.com/falcosecurity/event-generator/events" | ||
"net" | ||
) | ||
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var _ = events.Register( | ||
UnexpectedK8sNodePortConnection, | ||
events.WithDisabled(), // this rule is not included in falco_rules.yaml (stable rules), so disable the action | ||
) | ||
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func UnexpectedK8sNodePortConnection(h events.Helper) error { | ||
if h.InContainer() { | ||
port := 31000 | ||
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// Get the IP address of the "eth0" interface | ||
hostIP, err := getHostEth0IP() | ||
if err != nil { | ||
return err | ||
} | ||
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addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", hostIP, port)) | ||
if err != nil { | ||
return err | ||
} | ||
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// Establish a UDP connection to the address | ||
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conn, err := net.DialUDP("udp", nil, addr) | ||
if err != nil { | ||
return err | ||
} | ||
defer conn.Close() // Close the connection when the function returns | ||
} | ||
return &events.ErrSkipped{ | ||
Reason: "'Unexpected k8s Nodeport connection' is applicable only to containers.", | ||
} | ||
} |
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//go:build linux | ||
// +build linux | ||
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// SPDX-License-Identifier: Apache-2.0 | ||
/* | ||
Copyright (C) 2023 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. | ||
*/ | ||
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package syscall | ||
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import ( | ||
"errors" | ||
"net" | ||
) | ||
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func getHostEth0IP() (string, error) { | ||
ifaces, err := net.Interfaces() | ||
if err != nil { | ||
return "", err | ||
} | ||
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for _, iface := range ifaces { | ||
if iface.Name == "eth0" { | ||
addrs, err := iface.Addrs() | ||
if err != nil { | ||
return "", err | ||
} | ||
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for _, addr := range addrs { | ||
ipnet, ok := addr.(*net.IPNet) | ||
if ok && !ipnet.IP.IsLoopback() { | ||
if ipnet.IP.To4() != nil { | ||
return ipnet.IP.String(), nil | ||
} | ||
} | ||
} | ||
} | ||
} | ||
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return "", errors.New("eth0 interface not found or has no valid IPv4 address") | ||
} |