つけぇかた

Mac向け
jqとaws-cli要る

引数に何日前まで使ってないかをいれる

sh hoge.sh 60

#!/bin/bash

for i in `aws iam list-users | jq -r '.Users[].Arn'`
do
  jobId=$(aws iam generate-service-last-accessed-details --arn $i | jq -r '.JobId')
  lastActivity=$(\
      aws iam get-service-last-accessed-details --job-id $jobId | \
      jq -r '.ServicesLastAccessed[].LastAuthenticated' | \
      sort -n | tail -n 1
  )

  if [ $lastActivity == 'null' ] ; then
    continue
  fi

  lastActivityUnix=$(\
      date -u -j -f "%Y-%m-%dT%H:%M:%SZ" $lastActivity +%s
  )
  todayUnix=$(date +%s)
  if [ `expr $todayUnix - $lastActivityUnix` -ge `expr $1 "*" 86400` ] ; then
    echo "UserArn:" $i
    echo "LastActivity:" $lastActivity
    echo "======================================"
  
  fi
done

参考

使用していない認証情報の検索
https://docs.aws.amazon.com/ja_jp/IAM/latest/UserGuide/id_credentials_finding-unused.html