AWS 访问策略评估不允许放置存储桶策略

Question

我为 IAM 用户附加了以下策略：

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "s3:PutAnalyticsConfiguration",
                "s3:GetObjectVersionTagging",
                "s3:CreateBucket",
                "s3:ReplicateObject",
                "s3:GetObjectAcl",
                "s3:DeleteBucketWebsite",
                "s3:PutLifecycleConfiguration",
                "s3:GetObjectVersionAcl",
                "s3:PutBucketAcl",
                "s3:PutObjectTagging",
                "s3:DeleteObject",
                "s3:DeleteObjectTagging",
                "s3:GetBucketWebsite",
                "s3:PutReplicationConfiguration",
                "s3:DeleteObjectVersionTagging",
                "s3:GetBucketNotification",
                "s3:PutBucketCORS",
                "s3:DeleteBucketPolicy",
                "s3:GetReplicationConfiguration",
                "s3:ListMultipartUploadParts",
                "s3:PutObject",
                "s3:GetObject",
                "s3:PutBucketNotification",
                "s3:PutBucketLogging",
                "s3:PutObjectVersionAcl",
                "s3:GetAnalyticsConfiguration",
                "s3:GetObjectVersionForReplication",
                "s3:GetLifecycleConfiguration",
                "s3:GetInventoryConfiguration",
                "s3:GetBucketTagging",
                "s3:PutAccelerateConfiguration",
                "s3:DeleteObjectVersion",
                "s3:GetBucketLogging",
                "s3:ListBucketVersions",
                "s3:ReplicateTags",
                "s3:RestoreObject",
                "s3:ListBucket",
                "s3:GetAccelerateConfiguration",
                "s3:GetBucketPolicy",
                "s3:PutEncryptionConfiguration",
                "s3:GetEncryptionConfiguration",
                "s3:GetObjectVersionTorrent",
                "s3:AbortMultipartUpload",
                "s3:PutBucketTagging",
                "s3:GetBucketRequestPayment",
                "s3:GetObjectTagging",
                "s3:GetMetricsConfiguration",
                "s3:DeleteBucket",
                "s3:PutBucketVersioning",
                "s3:PutObjectAcl",
                "s3:ListBucketMultipartUploads",
                "s3:PutMetricsConfiguration",
                "s3:PutObjectVersionTagging",
                "s3:GetBucketVersioning",
                "s3:GetBucketAcl",
                "s3:PutInventoryConfiguration",
                "s3:GetObjectTorrent",
                "s3:ObjectOwnerOverrideToBucketOwner",
                "s3:PutBucketWebsite",
                "s3:PutBucketRequestPayment",
                "s3:GetBucketCORS",
                "s3:PutBucketPolicy",
                "s3:GetBucketLocation",
                "s3:ReplicateDelete",
                "s3:GetObjectVersion"
            ],
            "Resource": [
                "arn:aws:s3:::xyz123-mycloud-dump",
                "arn:aws:s3:::xyz123-mycloud-dump/SAMPLE/*"
            ]
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:HeadBucket"
            ],
            "Resource": "*"
        }
    ]
}

现在使用附加了上述策略的 IAM 用户的访问凭证，我正在尝试运行以下命令：

s3api put-bucket-policy --bucket xyz123-mycloud-dump --policy file://policy.json

policy.json 文件的内容在哪里：

{
    "Statement": [
      {
          "Effect": "Allow",
          "Principal": "arn:aws:iam::<the_account_number_to_which_the_user_belongs>:user/<the_IAM_user_name>",
          "Action": "s3:*",
          "Resource": ["arn:aws:s3:::xyz123-mycloud-dump/SAMPLE/*", "arn:aws:s3:::xyz123-mycloud-dump"]
      }
    ]
}

我得到一个

调用 PutBucketPolicy 操作时发生错误（AccessDenied）：访问被拒绝

现在我想知道为什么？

用户的政策声明允许PutBucketPolicy 对资源：

xyz123-mycloud-dump,
xyz123-mycloud-dump/SAMPLE/

这就是我在上面的政策中尝试做的事情。那为什么拒绝访问呢？

Answer 1

如果您在使用 policy.json 发布时的政策

我试过它给了我错误：

{
    "Version":"2012-10-17",
    "Id": "randome",
    "Statement":[
      {
        "Effect":"Allow",
        "Principal": "arn:aws:iam::1234567890:user/username",
        "Action": "s3:*",
        "Resource":[
            "arn:aws:s3:::mybucket",
            "arn:aws:s3:::mybucket/random/*"
        ]
      }
    ]
  }

$aws s3api put-bucket-policy --bucket mybucket --policy file://x.json

An error occurred (MalformedPolicy) when calling the PutBucketPolicy operation: Invalid policy syntax.

当我按照文档建议使用正确的政策时；

Bucket Policy Examples

{
    "Version":"2012-10-17",
    "Id": "randome",
    "Statement":[
      {
        "Effect":"Allow",
       "Principal": {
          "AWS": "arn:aws:iam::1234567890:user/username"
        },
        "Action": "s3:*",
        "Resource":[
            "arn:aws:s3:::mybucket",
            "arn:aws:s3:::mybucket/random/*"
        ]
      }
    ]
  }

有效

$ aws s3api put-bucket-policy --bucket mybucket --policy file://x.json
$ echo $?
0

Answer 2

来自here：

要解决拒绝访问错误，请检查以下内容：

• 您的 IAM 身份同时拥有 s3:GetBucketPolicy 和 s3:PutBucketPolicy 的权限。
• 存储桶策略不会拒绝您的 IAM 身份
  s3:GetBucketPolicy 或 s3:PutBucketPolicy 的权限。
• 启用 Amazon S3 阻止公共访问后，您对存储桶策略的更改不会授予公共访问权限。
• AWS Organizations 服务控制策略允许访问 Amazon S3。
• 如果存储桶策略拒绝所有人访问 s3:GetBucketPolicy、s3:PutBucketPolicy 或所有 Amazon S3 操作 (s3:*)，则删除存储桶策略。

检查您是否有您不知道的活动组织级别 SCP，或者是否启用了阻止公共访问。