[IBMCloud] IKS1.30 / ROKS4.15以降のセキュリティ設定(Secure by Default)

## セキュリティ設定（Secure by Default）とは？
**IKS1.30/ROKS4.15**以降の新しい IBM Cloud Kubernetes Service VPC クラスターをプロビジョンするときに、<font color="red">クラスターが機能するために必要なトラフィックのみが許可され、その他のアクセスはすべてブロックされるようになった。</font>PODから外部へ、外部からPODへの通信が必要な場合、明示的にセキュリティグループの変更が必要

IKS:[Secure by Default Cluster VPC ネットワーキングについて](https://cloud.ibm.com/docs/containers?topic=containers-vpc-security-group-reference)
ROKS：[Secure by Default Cluster VPC ネットワーキングについて](https://cloud.ibm.com/docs/openshift?topic=openshift-vpc-security-group-reference)

### 対象
* 新規で作成したIKS1.30以降
* 新規で作成したROKS4.15以降

### 非対象
* IKS1.29以前からアップデートし、1.30にした場合
* ROKS4.14以前からアップデートし、4.15にした場合

## デフォルトで許可設定がされている通信
[IKS]
[管理対象セキュリティー・グループ](https://cloud.ibm.com/docs/containers?topic=containers-vpc-security-group-reference#sbd-managed-groups)

[ROKS]
[管理対象セキュリティー・グループ](https://cloud.ibm.com/docs/openshift?topic=openshift-vpc-security-group-reference#sbd-managed-groups)

IKSのセキュリティグループ設定を確認してみる
デフォルトで作成されるSGの名前は以下の通り

* Worker security group (kube-<clusterID>)
* Master VPE gateway security group (kube-vpegw-<clusterID>)
* 共有VPEゲートウェイセキュリティグループ(kube-vpegw-<vpcID>)
* ロードバランサーサービスのセキュリティグループ (kube-lbaas-<clusterID>)

クラスタの管理画面から、**ネットワーキング**より確認できる
![貼り付けた画像_2024_07_30_15_03.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/703043/e4d2c62d-9795-7f73-301c-c9a6a464a19c.png)

セキュリティーグループの名前をクリックすると、より詳細なルールを確認可能
![貼り付けた画像_2024_07_30_15_05.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/703043/85fdeac5-c6b2-da63-d912-b11d8f5194f3.png)

## Secure by Defautの動作確認
デフォルトのセキュリティグループでは、アウトバウンドでのHTTPやHTTPSが設定されていない。
そのため、PODからインターネット上のシステムとは通信できない。

curl www.google.co.jp でhttp通信を実施するが、応答が返ってこない
```
% kubectl run -it busybox-cr --restart=Never --rm --image=jp.icr.io/khoshina-cr/busybox-cr sh
If you don't see a command prompt, try pressing enter.
/ # curl www.google.co.jp

```

### セキュリティグループのアウトバウンドへHTTPを許可する
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/703043/d0ce0948-f828-465c-1c16-041ebf7ff7ff.png)

![貼り付けた画像_2024_07_30_15_43.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/703043/29a93f2a-d223-6d99-d642-accecbe7d38a.png)


再度、curlを実行すると通信ができたことが確認できる
```
/ # curl www.google.co.jp
<!doctype html><html itemscope="" itemtype="http://schema.org/WebPage" lang="en"><head><meta content="Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for." name="description"><meta content="noodp, " name="robots"><meta content="text/html; charset=UTF-8" http-equiv="Content-Type"><meta content="/logos/doodles/2024/paris-games-artistic-gymnastics-day-2-6753651837110526-law.gif" itemprop="image"><meta content="Paris Games - Artistic Gymnastics" property="twitter:title"><meta content="Paris Games Artistic Gymnastics! #GoogleDoodle" property="twitter:description"><meta content="Paris Games Artistic Gymnastics! #GoogleDoodle" property="og:description"><meta content="summary_large_image" property="twitter:card"><meta content="@GoogleDoodles" property="twitter:site"><meta content="https://www.google.com/logos/doodles/2024/paris-games-artistic-gymnastics-day-2-6753651837110526-2xa.gif" property="twitter:image"><meta content="https://www.google.com/logos/doodles/2024/paris-games-artistic-gymnastics-day-2-6753651837110526-2xa.gif" property="og:image"><meta content="1000" property="og:image:width"><meta content="400" property="og:image:height"><meta content="https://www.google.com/logos/doodles/2024/paris-games-artistic-gymnastics-day-2-6753651837110526-2xa.gif" property="og:url"><meta content="video.other" property="og:type"><title>Google</title><script nonce="D9yjgmx4EwbBy1FmP0ZW8g">(function(){var _g={kEI:'VYuoZtmXA-G90PEP2viCmAI',kEXPI:'0,2504525,1195752,794,310,5,538659,2872,2891,8348,3406,31274,64288,60057,85641,2,16395,342,23024,6700,41945,57737,2,2,1,10956,13670,2006,8155,23350,22436,9779,12415,50243,36746,3801,2412,30219,3030,15816,357,1447,7734,26,18072,576,9821,10853,1635,29276,27083,5203198,9478,996,5991434,552,2840130,325,26707189,91859,1182080,16673,43886,3,318,4,1281,3,2124363,23029351,8163,3394,1242,16436,6429,23518,6717,47381,11640,10982,885,14280,8181,154,5780,8939,4318,2,9654,20583,10085,8926,2660,3008,426,3319,155,1,1,1,1756,2,723,8970,4534,1004,6731,6596,4,2540,4599,206,122,1543,1674,4,3004,4611,2,12,3311,38,1982,1,1,5,9711,409,518,5719,7304,687,2748,3,178,817,2927,1122,3,1,1770,1244,2695,1751,2724,974,5112,216,2704,2865,682,452,212,5670,172,339,916,2117,2,3,4484,49,1440,370,67,278,7,12,622,124,4,1248,1210,6,783,3,1,834,1878,1605,249,188,106,3207,1339,126,1,6,2249,367,3,194,190,4,724,799,175,3,3,529,1858,2,906,1,1960,2129,1987,872,22,1985,720,551,3606,7,2854,1141,111,1227,70,1,572,463,1533,429,125,13,615,44,2392,448,186,493,25,7,5,1518,703,1459,714,2,243,28,4,93,927,5,3,1250,67,752,711,60,441,621,166,30,98,92,56,121,395,1,207,1,511,242,2,792,2,265,213,1,250,268,4,859,512,5015,47,3,1054,1118,142,455,132,1,8,1,1,4,1,27,1122,160,1689,136,216,369,1000,2,1,6,380,78,108,91,483,2,24,459,1195,194,67,1285,333,206,240,3,38,50,15,86,93,719,377,83,133,866,84,642,1,897,129,2,2026,21151303,359918,5720,3,14475,3,7053,343,769,47,608,3539',kBL:'cvmk',kOPI:89978449};(function(){var a;((a=window.google)==null?0:a.stvsc)?google.kEI=_g.kEI:window.google=_g;}).call(this);})();(function(){google.sn='webhp';google.kHL='en';})();(function(){
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```

## アウトバウンドトラフィックに関しての保護を無効化
アウトバウンドトラフィックに関しての保護を無効化することで、セキュリティグループの管理が不要となる
可能であれば有効化しておくのが望ましいが、問題の切り分け等で一時的に無効化するのが良さそう

[IKS]
[クラスター作成時のアウトバウンド・トラフィック保護の無効化](https://cloud.ibm.com/docs/containers?topic=containers-sbd-allow-outbound#new-cluster-sbd)

[ROKS]
[クラスター作成時のアウトバウンド・トラフィック保護の無効化](https://cloud.ibm.com/docs/openshift?topic=openshift-sbd-allow-outbound#new-cluster-sbd)

### 保護の有効化時の通信確認
curlでの通信ができない
```
kh@khs-MacBook-Pro ~ % kubectl run -it busybox-cr --restart=Never --rm --image=jp.icr.io/khoshina-cr/busybox-cr sh
If you don't see a command prompt, try pressing enter.
/ #
/ #
/ # curl www.google.co.jp

```

### アウトバウンドトラフィックの保護を無効化し、通信確認
```
% ibmcloud ks vpc outbound-traffic-protection disable --cluster cqk889ut04o0s8uqhpp0
All outbound traffic from your cluster will be permitted. Do you want to continue? [y/N]> y
OK
```

保護を無効化するとセキュリティグループに以下の設定が追加される
**ALL 0.0.0.0/0 -> 0.0.0.0/0**
![貼り付けた画像_2024_07_30_15_50.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/703043/36b649cc-7a0b-47c8-7ca2-b4d7b96fc68c.png)


通信ができることを確認
```
% kubectl run -it busybox-cr --restart=Never --rm --image=jp.icr.io/khoshina-cr/busybox-cr sh
If you don't see a command prompt, try pressing enter.
/ #
/ #
/ # curl www.google.co.jp
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```

### アウトバウンドトラフィックの保護を有効化
追加されたセキュリティグループの削除される。
```
% ibmcloud ks vpc outbound-traffic-protection enable --cluster cqk889ut04o0s8uqhpp0
All outbound traffic is blocked unless it is allowed by a security group. Do you want to continue? [y/N]> y
OK
```

## セキュリティグループ設定の初期化
以下のコマンドで実施できるが、徐々に初期化されてデフォルト設定が復活する。
そのため、一時的に通信ができなくなるので問題なければ実施すること

ibmcloud ks security-group reset --cluster <ClusterID> --security-group <初期化対象のセキュリティグループID>
```
% ibmcloud ks security-group reset --cluster cqk889ut04o0s8uqhpp0 --security-group r022-4fae70ec-ed93-4bbc-a6bf-73f252353bca
ルールをリセットする間、クラスターへのネットワーク・トラフィックが一時的にブロックされる可能性があります。 続行しますか? [y/N]> y
OK
```