AWS IAM 策略：按用户/角色限制存储桶/文件夹访问？

Posted 2023-02-23

【中文标题】AWS IAM 策略：按用户/角色限制存储桶/文件夹访问？

【英文标题】：AWS IAM Policy: Restrict Bucket/Folder Access By User/Role?

【发布时间】：2018-03-15 20:58:50

【问题描述】：

我正在尝试按角色限制用户仅访问 S3 存储桶中的特定文件夹。可以说，存储桶被配置为“模拟安装”，这样我们就可以将它用于文件共享，就好像它是一个更传统的服务器一样。每个用户都在使用 CloudBerry 远程访问 S3。

这是我当前的（损坏的）策略，存储桶名称是“bluebolt”。

"Version": "2012-10-17",
"Statement": [
    
        "Sid": "AllowUserToSeeBucketListInTheConsole",
        "Effect": "Allow",
        "Action": [
            "s3:GetBucketLocation",
            "s3:ListAllMyBuckets"
        ],
        "Resource": [
            "arn:aws:s3:::*"
        ]
    ,
    
        "Sid": "AllowRootAndHomeListingOfCompanySharedAndPAndP",
        "Effect": "Allow",
        "Action": [
            "s3:ListBucket"
        ],
        "Resource": [
            "arn:aws:s3:::bluebolt"
        ],
        "Condition": 
            "StringEquals": 
                "s3:prefix": [
                    "",
                    "Production and Processing/",
                    "Production and Processing/$aws:username",
                    "Company Shared/"
                ],
                "s3:delimiter": [
                    "/"
                ]
            
        
    ,
    
        "Sid": "AllowListingOfCompanyShared",
        "Effect": "Allow",
        "Action": [
            "s3:ListBucket"
        ],
        "Resource": [
            "arn:aws:s3:::bluebolt"
        ],
        "Condition": 
            "StringLike": 
                "s3:prefix": [
                    "Company Shared/*"
                ]
            
        
    ,
    
        "Sid": "AllowListingOfUserFolder",
        "Effect": "Allow",
        "Action": [
            "s3:ListBucket"
        ],
        "Resource": [
            "arn:aws:s3:::bluebolt"
        ],
        "Condition": 
            "StringLike": 
                "s3:prefix": [
                    "Production and Processing/$aws:username/",
                    "Production and Processing/$aws:username/*"
                ]
            
        
    ,
    
        "Sid": "AllowAllS3ActionsCompanyShared",
        "Effect": "Allow",
        "Action": [
            "s3:*"
        ],
        "Resource": [
            "arn:aws:s3:::bluebolt/Company Shared/*"
        ]
    ,
    
        "Sid": "AllowAllS3ActionsInUserFolder",
        "Effect": "Allow",
        "Action": [
            "s3:*"
        ],
        "Resource": [
            "arn:aws:s3:::bluebolt/Production and Processing/$aws:username/*"
        ]
    ,
    
        "Sid": "DenyAllS3ActionsInManagement",
        "Effect": "Deny",
        "Action": [
            "s3:*"
        ],
        "Resource": [
            "arn:aws:s3:::bluebolt/Management/*"
        ]
    
]

所以，我想做的是限制用户仅列出/读取/写入“/Production and Processing/[UserName]”中的内容，同时能够列出/读取“/Company Shared”中的所有内容同时明确禁止对“/Management”以及“/Production and Processing/*”中除用户文件夹之外的所有内容的所有访问。理想情况下，用户只会在 bluebolt 中看到“/Company Shared”和“/Production and Processing”，一旦他们进入“/Production and Processing”，他们只会看到他们的用户名文件夹，即他们的工作区。

现在，一旦用户在 bluebolt ***存储桶下方进行挖掘，我就会得到零星的访问权限（“您没有访问权限”）。

我不知道这个用例是否常见，或者我是否试图将太方的钉子放入圆孔中，但欢迎任何反馈/提示/类似的政策应用程序/严厉的批评，并非常感谢！

【问题讨论】：

您最好的办法是查看存储桶日志以了解软件正在尝试执行的操作。它可能不会根据用户实际尝试执行的操作来发出合理的请求。您还可能会在键前缀中使用空格来寻求麻烦。 S3 在内部以奇怪的方式处理它们，我怀疑这是遗留原因，可能期望 "Production and Processing/" 是 "Production+and+Processing/"（未确认）。

【参考方案1】：

IAM policy variables with federated users

$aws:userName 策略变量不适用于角色。使用 $aws:userID 策略变量而不是 $aws:userName 策略变量。

$aws:userid 变量将为“ROLEID:caller-specified-name”。

我对@9​​87654322@ 和一个角色使用了相同的策略。

获取角色 ID。

iam get-role --role-name Arsenal-role --query Role.RoleId
AROAXXT2NJT7D3SIQN7Z6

请您的用户上传到Bucket/Prefix/<RoleID:SessionName>/

aws s3 cp test.txt 's3://mydemo/Production and Processing/AROAXXT2NJT7D3SIQN7Z6:john/' --profile s3role
upload: ./test.txt to s3://mydemo/Production and Processing/AROAXX2NJT7D3SIQN7Z6:john/test.txt

aws s3 cp test.txt 's3://mydemo/Management/' --profile s3role
upload failed: ./test.txt to s3://mydemo/Management/test.txt An error occurred (AccessDenied) when calling the PutObject operation: Access Denied

aws s3 cp test.txt 's3://mydemo/Production and Processing/' --profile s3role
upload failed: ./test.txt to s3://mydemo/Production and Processing An error occurred (AccessDenied) when calling the PutObject operation: Access Denied

【参考方案2】：

这是我开始工作的代码。

"Version": "2012-10-17",
"Statement": [
    
        "Sid": "AllowListingOfUserFolder",
        "Action": [
            "s3:ListBucket"
        ],
        "Effect": "Allow",
        "Resource": [
            "arn:aws:s3:::bluebolt"
        ],
        "Condition": 
            "StringLike": 
                "s3:prefix": [
                    "*",
                    "bluebolt/Company Shared/*",
                    "bluebolt/Production and Processing/*",
                    "bluebolt/Production and Processing/$aws:userName/*"
                ]
            
        
    ,
    
        "Sid": "AllowAllS3ActionsInUserFolder",
        "Action": [
            "s3:PutObject",
            "s3:GetObject",
            "s3:GetObjectVersion",
            "s3:DeleteObject"
        ],
        "Effect": "Allow",
        "Resource": [
            "arn:aws:s3:::bluebolt/Production and Processing/$aws:userName/*"
        ]
    ,
    
        "Sid": "AllowCertainS3ActionsInCompanyShared",
        "Action": [
            "s3:GetObject",
            "s3:GetObjectVersion"
        ],
        "Effect": "Allow",
        "Resource": [
            "arn:aws:s3:::bluebolt/Company Shared/*"
        ]
    
]

【讨论】：

这是针对用户还是角色？