Question

我在一个AWS账户中有一个s3存储桶说ACCID1。我想允许root用户和一个特定用户USER1对其拥有完全访问权限。从另一个帐户，ACCID2，我有IAM角色，我想附加到EC2实例，并且只允许从该IAM角色进行访问。角色是备份 - 完全访问（读取，写入和删除）。我创建了以下存储桶策略，但是无法通过以上IAM角色启动的EC2实例访问存储桶（在ACCID2中）。我能够从EC2实例中将它作为来自ACCID1的USER1使用，并执行列表，创建和删除。

{  
   "Version":"2012-10-17",
   "Id":"BackupBucketPolicy",
   "Statement":[  
      {  
         "Sid":"DenyAllOther",
         "Effect":"Deny",
         "NotPrincipal":{  
            "AWS":[  
               "arn:aws:iam::ACCID1:user/USER1",
               "arn:aws:iam::ACCID1:root",
               "arn:aws:iam::ACCID2:role/backup-full-access"
            ]
         },
         "Action":"s3:*",
         "Resource":[  
            "arn:aws:s3:::test-nr-6",
            "arn:aws:s3:::test-nr-6/*"
         ]
      },
      {  
         "Sid":"DevAccountRootFullAccess",
         "Effect":"Allow",
         "Principal":{  
            "AWS":[  
               "arn:aws:iam::ACCID1:user/USER1",
               "arn:aws:iam::ACCID1:root"
            ]
         },
         "Action":"s3:*",
         "Resource":[  
            "arn:aws:s3:::test-nr-6",
            "arn:aws:s3:::test-nr-6/*"
         ]
      },
      {  
         "Sid":"GraphBackupReadWriteDeleteAccess",
         "Effect":"Allow",
         "Principal":{  
            "AWS":"arn:aws:iam::ACCID2:role/backup-full-access"
         },
         "Action":[  
            "s3:ListBucket",
            "s3:GetObject",
            "s3:PutObject",
            "s3:DeleteObject"
         ],
         "Resource":[  
            "arn:aws:s3:::test-nr-6",
            "arn:aws:s3:::test-nr-6/*"
         ]
      }
   ]
}

IAM角色备份 - 完全访问具有策略：

{  
   "Version":"2012-10-17",
   "Statement":[  
      {  
         "Sid":"Stmt2",
         "Effect":"Allow",
         "Action":[  
            "s3:ListBucket",
            "s3:GetObject",
            "s3:PutObject",
            "s3:DeleteObject"
         ],
         "Resource":[  
            "arn:aws:s3:::test-nr-6",
            "arn:aws:s3:::test-nr-6/*"
         ]
      }
   ]
}

我无法弄清楚这里出了什么问题。任何帮助将不胜感激。

Answer 1

首先，您不需要 deny-all-other 策略，因为S3存储桶权限是默认拒绝的。

其次，您需要在创建时将backup-full-access角色的类型设置为跨帐户访问角色。

最后，您的角色政策应写为：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "s3:ListAllMyBuckets",
      "Resource": "arn:aws:s3:::*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket",
        "s3:GetBucketLocation"
       ],
      "Resource": "arn:aws:s3:::test-nr-6"
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": "arn:aws:s3:::test-nr-6/*"
    }
  ]
}

来源：Delegate Access Across AWS Accounts Using IAM Roles

aws s3 Bucket策略未按预期工作

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