如何在信任关系中实现ImportValue

Question

我已经从另一个堆栈导出了一个值，并试图导入cloudformation角色中的"AssumeRolePolicyDocument“，尝试了许多方法，但得到了以下错误

位置语法错误(服务: AmazonIdentityManagement；状态代码: 400；错误代码: MalformedPolicyDocument；请求ID: b1b4b5ef-88ef-8a7-0548ce0002a6；代理:null)

  EksAutoscalerRole: 
    Type: AWS::IAM::Role
    Properties:
      RoleName: Eks-Autoscaler-Role
      Path: "/"
      AssumeRolePolicyDocument: 
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Federated: 
              'Fn::Sub':
              - 'arn:aws:iam::1122334455:oidc-provider/oidc.eks.us-east-1.amazonaws.com/id/${oidc}'
              - oidc: 
                  "Fn::ImportValue": EksOidc
          Action: 'sts:AssumeRoleWithWebIdentity'
          Condition:
            StringEquals:   
              'Fn::Sub': 
              - 'oidc.eks.us-east-1.amazonaws.com/id/${oidc}:sub: system:serviceaccount:kube-system:cluster-autoscaler'
              - oidc: 
                  "Fn::ImportValue": EksOidc
      ManagedPolicyArns:
      - !Ref EksAutoscalerPolicy

也尝试了以下方法：插入类似于如何插入参数的CloudFormation ImportValue？

更新后的尝试了下面的代码现在有效了。

  EksAutoscalerRole: 
    Type: AWS::IAM::Role
    Properties:
      RoleName: Eks-Autoscaler-Role
      Path: /
      AssumeRolePolicyDocument: 
        "Fn::Sub":
        - '{
            "Version": "2012-10-17",
            "Statement": [
                {
                    "Effect": "Allow",
                    "Principal": {
                        "Federated": "${EksAutoscalerProvider}"
                    },
                    "Action": "sts:AssumeRoleWithWebIdentity",
                    "Condition": {
                        "StringEquals": {
                            "oidc.eks.${AWS::Region}.amazonaws.com/id/${oidcNo}:sub": "system:serviceaccount:kube-system:cluster-autoscaler"
                        }
                    }
                }
            ]
          }'
        - oidcNo: !Select [0, !Split [".", !Select [1, !Split ["//", !GetAtt EksCluster.Endpoint]]]]
      ManagedPolicyArns:
      - !Ref EksAutoscalerPolicy

Answer 1

检查你的压痕。根据文档，子函数应该缩进如下

Fn::Sub:
  - String
  - Var1Name: Var1Value
    Var2Name: Var2Value