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@hoshiko(kohei hoshi)

[JAWS-UG CLI] #91 Amazon Inspector入門 (9) : Inspector実行用Lambda function作成

Last updated at Posted at 2017-08-21

AWS CLIを利用して、Inspectorを定期実行するLambda functionを作成して実行します

本記事について

本記事はJAWS-UG CLI専門支部の実施する予定だったハンズオン手順書です。
Lambdaでスケジュール実行するための手順でしたが、CloudWatch Eventから直接スケジュール実行が可能になったためこちらは廃止としました。

最新の全工程については下記総合案内をご確認ください。
#91 Amazon Inspector 入門 (CloudWatch Eventで定期診断編)

前提条件

Lambdaへの権限

Lambdaに対してフル権限があること。

AWS CLIのバージョン

以下のバージョンで動作確認済

  • AWS CLI 1.11.122
コマンド
aws --version

結果(例):

 aws-cli/1.11.122 Python/2.7.10 Linux/4.1.27-25.49.amzn1.x86_64 botocore/1.5.85

バージョンが古い場合は最新版に更新しましょう。

コマンド
sudo -H pip install -U awscli
  1. 準備
    =======

まず変数の確認をします。

変数の確認
cat << ETX

        AWS_DEFAULT_PROFILE: (0.1) ${AWS_DEFAULT_PROFILE}
        IAM_ROLE_NAME        (0.2) ${IAM_ROLE_NAME}
        IAM_ROLE_ARN         (0.3) ${IAM_ROLE_ARN}

ETX

結果(例):

    AWS_DEFAULT_PROFILE: (0.1) 
    IAM_ROLE_NAME        (0.2) lambda_inspector_role
    IAM_ROLE_ARN         (0.3) arn:aws:iam::xxxx:role/lambda_inspector_role

変数が入っていない、適切でない場合は、それぞれの手順番号について作業を
行います。

0.1. プロファイルの指定

プロファイルの一覧を確認します。

コマンド
cat ~/.aws/credentials \
       | grep '\[' \
       | sed 's/\[//g' | sed 's/\]//g'

結果(例):

  iamFull-prjz-mbpr13
  <IAMのフル権限を許可されたプロファイル>
変数の設定
export AWS_DEFAULT_PROFILE='<IAMのフル権限を許可されたプロファイル>'

0.2. IAMロール名の指定

変数の設定
IAM_ROLE_NAME='inspector_role'

0.3. IAMロールARNの指定

IAMロールのARN確認

コマンド
IAM_ROLE_ARN=$( \
        aws iam get-role \
          --role-name ${IAM_ROLE_NAME} \
          --query 'Role.Arn' \
          --output text \
) \
        && echo "${IAM_ROLE_ARN}"

結果(例):

 arn:aws:iam::xxxxx:role/lambda_inspector_role

最終確認

変数の確認
cat << ETX

        AWS_DEFAULT_PROFILE: (0.1) ${AWS_DEFAULT_PROFILE}
        IAM_ROLE_NAME        (0.2) ${IAM_ROLE_NAME}
        IAM_ROLE_ARN     　  (0.3) ${IAM_ROLE_ARN}

ETX

結果(例):

    AWS_DEFAULT_PROFILE: (0.1) 
    IAM_ROLE_NAME        (0.2) lambda_inspector_role
    IAM_ROLE_ARN         (0.3) arn:aws:iam::5xxxxx:role/lambda_inspector_role

本作業

1.1.lambdafunction名指定

コマンド
LAMBDA_FUNC_NAME='inspector-lambda'
FILE_LAMBDA_FUNC="${LAMBDA_FUNC_NAME}.js"

結果:

  (戻り値なし)

1.2.lambdafunction名確認

コマンド
cat << ETX

  FILE_LAMBDA_FUNC:        ${FILE_LAMBDA_FUNC}
　ASSESSMENT_TEMPLATE_ARN: ${ASSESSMENT_TEMPLATE_ARN}

ETX

結果(例):

  FILE_LAMBDA_FUNC:        inspector-lambda.js
　ASSESSMENT_TEMPLATE_ARN: arn:aws:inspector:ap-northeast-1:xxxxxxx:target/0-ZVbpDP3K/template/0-YZMRHdpp

1.3.lambdafunctionファイル設定

コマンド
cat << EOF > ${FILE_LAMBDA_FUNC}
'use strict';
const AWS = require('aws-sdk');

const inspector = new AWS.Inspector();

const params = {
    assessmentTemplateArn: "${ASSESSMENT_TEMPLATE_ARN}",
};

exports.handler = (event, context, callback) => {
    try {
        // Inspector.StartAssessmentRun response will look something like:
        // {"assessmentRunArn":"${ASSESSMENT_TEMPLATE_ARN}"
        inspector.startAssessmentRun(params, (error, data) => {
            if (error) {
                console.log(error, error.stack);
                return callback(error);
            }

            console.log(data);
            return callback(null, data);
        });
    } catch (error) {
        console.log('Caught Error: ', error);
        callback(error);
    }
};
EOF

cat ${FILE_LAMBDA_FUNC}

結果(例):

 'use strict';
 const AWS = require('aws-sdk');
 
 const inspector = new AWS.Inspector();
 
 const params = {
     assessmentTemplateArn: "arn:aws:inspector:ap-northeast-1:549352348160:target/0-ZVbpDP3K/template/0-YZMRHdpp",
 };
 
 exports.handler = (event, context, callback) => {
     try {
         // Inspector.StartAssessmentRun response will look something like:
         // {"assessmentRunArn":"arn:aws:inspector:ap-northeast-1:549352348160:target/0-ZVbpDP3K/template/0-YZMRHdpp"
         inspector.startAssessmentRun(params, (error, data) => {
             if (error) {
                 console.log(error, error.stack);
                 return callback(error);
             }
 
             console.log(data);
             return callback(null, data);
         });
     } catch (error) {
         console.log('Caught Error: ', error);
         callback(error);
     }
 };
コマンド
zip ${LAMBDA_FUNC_NAME}.zip ${FILE_LAMBDA_FUNC}

結果(例):

   adding: inspector-lambda.js (deflated 56%)

2.1.lambdafunction用変数指定

コマンド
LAMBDA_FUNC_DESC='Schedules a recurring Amazon Inspector assessment run'
LAMBDA_RUNTIME='nodejs4.3'
LAMBDA_HANDLER="${LAMBDA_FUNC_NAME}.handler"
FILE_LAMBDA_ZIP="${LAMBDA_FUNC_NAME}.zip"

2.2.設定用変数の確認

コマンド
cat << ETX

        LAMBDA_FUNC_NAME:  ${LAMBDA_FUNC_NAME}
        LAMBDA_FUNC_DESC:  "${LAMBDA_FUNC_DESC}"
        LAMBDA_RUNTIME:    ${LAMBDA_RUNTIME}
        IAM_ROLE_ARN:      ${IAM_ROLE_ARN}
        LAMBDA_HANDLER:    ${LAMBDA_HANDLER}
        FILE_LAMBDA_ZIP    ${FILE_LAMBDA_ZIP}

ETX

結果(例):

    LAMBDA_FUNC_NAME:  inspector-lambda
    LAMBDA_FUNC_DESC:  "Schedules a recurring Amazon Inspector assessment run"
    LAMBDA_RUNTIME:    nodejs4.3
    IAM_ROLE_ARN:      arn:aws:iam::549352348160:role/lambda_inspector_role
    LAMBDA_HANDLER:    inspector-lambda.handler
    FILE_LAMBDA_ZIP    inspector-lambda.zip

2.3.lambdafunction作成

コマンド
aws lambda create-function \
        --function-name ${LAMBDA_FUNC_NAME} \
        --description "${LAMBDA_FUNC_DESC}" \
        --zip-file fileb://${FILE_LAMBDA_ZIP} \
        --runtime ${LAMBDA_RUNTIME} \
        --role ${IAM_ROLE_ARN} \
        --handler ${LAMBDA_HANDLER}

結果(例):

   {
       "TracingConfig": {
           "Mode": "PassThrough"
       },
       "CodeSha256": "FvWrbSR1JNa3VXNC2uB3ibyjimxxxxxxx",
       "FunctionName": "inspector-lambda",
       "CodeSize": 567,
       "MemorySize": 128,
       "FunctionArn": "arn:aws:lambda:ap-northeast-1:xxxx:function:inspector-lambda",
       "Version": "$LATEST",
       "Role": "arn:aws:iam::549352348160:role/lambda_inspector_role",
       "Timeout": 3,
       "LastModified": "2017-07-24T06:47:34.517+0000",
       "Handler": "inspector-lambda.handler",
       "Runtime": "nodejs4.3",
       "Description": "Schedules a recurring Amazon Inspector assessment run"
   }

2.3.lambdafunction確認

コマンド
aws lambda get-function \
        --function-name ${LAMBDA_FUNC_NAME}

結果(例):

 {
     "Code": {
         "RepositoryType": "S3",
         "Location": "https://awslambda-ap-nxxxxxxxxxxxx"
     },
     "Configuration": {
         "TracingConfig": {
             "Mode": "PassThrough"
         },
         "Version": "$LATEST",
         "CodeSha256": "FvWrbSR1JNa3VXNC2uB3ibyjimWyEzzzzzzzz",
         "FunctionName": "inspector-lambda",
         "MemorySize": 128,
         "CodeSize": 567,
         "FunctionArn": "arn:aws:lambda:ap-northeast-1:5493xxxx:function:inspector-lambda",
         "Handler": "inspector-lambda.handler",
         "Role": "arn:aws:iam::54935x2xxxxxxxx:role/lambda_inspector_role",
         "Timeout": 3,
         "LastModified": "2017-07-24T06:47:34.517+0000",
         "Runtime": "nodejs4.3",
         "Description": "Schedules a recurring Amazon Inspector assessment run"
     }
 }
コマンド
aws lambda get-function-configuration \
        --function-name ${LAMBDA_FUNC_NAME}

結果(例):

 {
     "TracingConfig": {
         "Mode": "PassThrough"
     },
     "CodeSha256": "FvWrbSR1JNa3VXNC2uB3ibyjimWyE4r+gPvFtI1R1jQ=",
     "FunctionName": "inspector-lambda",
     "CodeSize": 567,
     "MemorySize": 128,
     "FunctionArn": "arn:aws:lambda:ap-northeast-1:54xxxxx:function:inspector-lambda",
     "Version": "$LATEST",
     "Role": "arn:aws:iam::549352348160:role/lambda_inspector_role",
     "Timeout": 3,
     "LastModified": "2017-07-24T06:47:34.517+0000",
     "Handler": "inspector-lambda.handler",
     "Runtime": "nodejs4.3",
     "Description": "Schedules a recurring Amazon Inspector assessment run"
 }

2.3.lambdafunction手動実行用変数設定

コマンド
FILE_OUTPUT_LAMBDA="${LAMBDA_FUNC_NAME}-out.txt" \
        && echo ${FILE_OUTPUT_LAMBDA}
コマンド
cat << ETX

        LAMBDA_FUNC_NAME:   ${LAMBDA_FUNC_NAME}
        FILE_OUTPUT_LAMBDA: ${FILE_OUTPUT_LAMBDA}

ETX

結果(例):

    LAMBDA_FUNC_NAME:   inspector-lambda
    FILE_OUTPUT_LAMBDA: inspector-lambda-out.txt
コマンド
FILE_LOG_LAMBDA="${LAMBDA_FUNC_NAME}-$(date +%Y%m%d%H%M%S).log" \
        && echo ${FILE_LOG_LAMBDA}

2.4.lambdafunction手動実行

他の診断が実行中の場合、エラーとなりますので必ずInspectorno実行状況を確認してから実行してください。

コマンド
aws lambda invoke \
        --function-name ${LAMBDA_FUNC_NAME} \
        --log-type Tail \
        ${FILE_OUTPUT_LAMBDA} \
        > ${FILE_LOG_LAMBDA} \
コマンド
cat ${FILE_LOG_LAMBDA} \
   | jp.py 'StatusCode'

結果(例):

   200

200が出ていれば成功

2.6.lambdafunctionの実行結果の確認

コマンド
cat ${FILE_OUTPUT_LAMBDA}

結果(例):

 {"assessmentRunArn":"arn:aws:inspector:ap-northeast-1:549352348160:target/0-ZVbpDP3K/template/0-YZMRHdpp/run/0-9wd6AT8V"}

2.7.lambdafunctionののログの確認

コマンド
cat ${FILE_LOG_LAMBDA} \
        | jp.py 'LogResult' \
        | sed 's/\"//g' \
        | base64 --decode

結果(例):

 START RequestId: a411c2f7-703e-11e7-9f55-d756e6d26920 Version: $LATEST
 2017-07-24T07:06:41.612Z        a411c2f7-703e-11e7-9f55-d756e6d26920    { assessmentRunArn: 'arn:aws:inspector:ap-northeast-1:xxxxxxxx:target/0-ZVbpDP3K/template/0-YZMRHdpp/run/0-9wd6AT8V' }
 END RequestId: a411c2f7-703e-11e7-9f55-d756e6d26920
 REPORT RequestId: a411c2f7-703e-11e7-9f55-d756e6d26920  Duration: 1452.50 ms    Billed Duration: 1500 ms        Memory Size: 128 MB     Max Memory Used: 43 MB

2.7.Inspectorの実行結果の確認

コマンド
ASSESSMENT_RUN_ARN=`cat ${FILE_OUTPUT_LAMBDA}|awk -F\" '{print $4}'`
aws inspector describe-assessment-runs \
   --assessment-run-arns ${ASSESSMENT_RUN_ARN}

結果(例):

 {
     "failedItems": {},
     "assessmentRuns": [
         {
             "dataCollected": true,
             "name": "template-security-15m/2017-07-24T07:06/zcoQ",
             "completedAt": 1500880986.637,
             "userAttributesForFindings": [],
             "stateChanges": [
                 {
                     "state": "CREATED",
                     "stateChangedAt": 1500880001.32
                 },
                 {
                     "state": "START_DATA_COLLECTION_PENDING",
                     "stateChangedAt": 1500880001.428
                 },
                 {
                     "state": "START_DATA_COLLECTION_IN_PROGRESS",
                     "stateChangedAt": 1500880001.502
                 },
                 {
                     "state": "COLLECTING_DATA",
                     "stateChangedAt": 1500880001.617
                 },
                 {
                     "state": "STOP_DATA_COLLECTION_PENDING",
                     "stateChangedAt": 1500880901.809
                 },
                 {
                     "state": "DATA_COLLECTED",
                     "stateChangedAt": 1500880965.342
                 },
                 {
                     "state": "START_EVALUATING_RULES_PENDING",
                     "stateChangedAt": 1500880965.55
                 },
                 {
                     "state": "EVALUATING_RULES",
                     "stateChangedAt": 1500880966.067
                 },
                 {
                     "state": "COMPLETED",
                     "stateChangedAt": 1500880986.637
                 }
             ],
             "createdAt": 1500880001.32,
             "findingCounts": {
                 "High": 0,
                 "Medium": 1,
                 "Informational": 0,
                 "Low": 0
             },
             "notifications": [],
             "state": "COMPLETED",
             "stateChangedAt": 1500880986.637,
             "durationInSeconds": 900,
             "rulesPackageArns": [
                 "arn:aws:inspector:ap-northeast-1:406045910587:rulespackage/0-bBUQnxMq"
             ],
             "startedAt": 1500880001.617,
             "assessmentTemplateArn": "arn:aws:inspector:ap-northeast-1:549352348160:target/0-ZVbpDP3K/template/0-YZMRHdpp",
             "arn": "arn:aws:inspector:ap-northeast-1:549352348160:target/0-ZVbpDP3K/template/0-YZMRHdpp/run/0-9wd6AT8V"
         }
     ]
 }

stateがCOMPLETEDに変わっていたら完了

2.8.診断レポートの確認

stateがCOMPLETEDに変わってから実行します

コマンド
aws inspector get-assessment-report \
   --assessment-run-arn ${ASSESSMENT_RUN_ARN}
   --report-file-format HTML \
   --report-type FINDING

結果(例):

 {
     "status": "COMPLETED",
     "url": "https://inspector-temp-reports-prod-ap-northeast-1.s3-ap-northeast-1.amazonaws.comxxxxxx"
 }

ブラウザでURLにアクセスすると診断レポートを閲覧できます

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