amazon-web-services - AWS 云形成堆栈中角色的托管策略

Question

使用 AWS，我正在构建一个 cloud formation堆栈定义:

1. 名为 MyPolicy 的托管策略
2. 名为 MyRole 的角色，应附加该策略

堆栈将由管理员创建；创建后，目标是允许(从堆栈外部)一些用户承担 MyRole。

我的问题:应如何定义角色才能附加该策略？

---

role properties 的 AWS 帮助页面建议使用 ManagedPolicyArns，但根据我引用 MyPolicy 的方式，我会收到各种错误:

如果我使用 GetAtt 函数检索策略的 arn，我会在模板验证时收到错误:

"ManagedPolicyArns": [ { "Fn::GetAtt" : [ "MyPolicy", "Arn" ] } ]

Template error: resource MyPolicy does not support attribute type Arn in Fn::GetAtt

---

如果我使用 Join 函数构建策略的 arn，我会在角色创建过程中收到错误。

"ManagedPolicyArns": [ { "Fn::Join" : [ "", [ "arn:aws:iam::", { "Ref": "AWS::AccountId" }, ":policy/", { "Ref": "MyPolicy" } ] ] } ]

ARN arn:aws:iam::aws:policy/arn:aws:iam::«my-account-id»:policy/MyPolicy is not valid. (Service: AmazonIdentityManagement; Status Code: 400; Error Code: InvalidInput; Request ID: «an-id»)

---

下面是我使用 JSON 格式的堆栈定义:

{
    "AWSTemplateFormatVersion" : "2010-09-09",
    "Resources" : {
        "MyPolicy" : {
            "Type": "AWS::IAM::ManagedPolicy",
            "Properties": {
                "ManagedPolicyName" : "MyPolicy",
                "PolicyDocument" : {
                    "Version": "2012-10-17",
                    "Statement": [
                        {
                            "Effect": "Allow",
                            "Action": [ "s3:*" ],
                            "Resource": "arn:aws:s3:::the-bucket"
                        }
                    ]
                }
            }
        },

        "MyRole" : {
            "Type": "AWS::IAM::Role",
            "RoleName": "MyRole",
            "AssumeRolePolicyDocument": {
                "Version": "2012-10-17",
                "Statement": [
                    {
                        "Effect": "Allow",
                        "Principal": { "AWS": {"Fn::Join" : [ "", [ "arn:aws:iam::", { "Ref": "AWS::AccountId" }, ":root" ] ] } },,
                        "Action": [ "sts:AssumeRole" ]
                    }
                ]
            },
            "ManagedPolicyArns": [
                { "Fn::GetAtt" : [ "MyPolicy", "Arn" ] }
            ]
        }
    }
}

Answer 1

{"Ref": "MyPolicy"} 将返回您的堆栈创建的托管策略的 ARN。您的错误消息表明了这一点。另外，检查this AWS 文档。