跨賬戶 SNS 在第二個賬戶中訂閱 Lambda

Question

我已使用以下 SNS 主題策略在 Lambda 中訂閱此 SNS，帳號為 222222222222。我還授予了對我的 lambda 的訪問權限，並使用類似的策略將其添加到 Lambda 的執行角色中。

得到以下錯誤：

創建觸發器時發生錯誤：用戶：arn:aws:sts::222222222222:assumed-role/TSI_Base_FullAccess/AXXXXXXXX is notauthorized to perform: SNS:Subscribe on resource: arn:aws:sns:eu-west-1: 111111111111：Story-5555（服務：AmazonSNS；狀態碼：403；錯誤碼：AuthorizationError；請求ID：1321942c-25c4-52a1-bacb-c2e9bd641067）

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmt1582008007178",
      "Action": [
        "sns:GetSubscriptionAttributes",
        "sns:GetTopicAttributes",
        "sns:ListSubscriptions",
        "sns:ListSubscriptionsByTopic",
        "sns:ListTagsForResource",
        "sns:ListTopics",
        "sns:Publish",
        "sns:Subscribe"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:sns:eu-west-1:111111111111:Story-5555",
      "Condition": {
        "ArnEquals": {
          "aws:PrincipalArn": "arn:aws:lambda:eu-west-1:222222222222:function:New_Cross_SNS"
        }
      }
    }
  ]
}

Answer 1

根據AWS 文檔，您應該在條件之外指定原則。

所以你的政策應該類似於

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmt1582008007178",
      "Action": [
        "sns:GetSubscriptionAttributes",
        "sns:GetTopicAttributes",
        "sns:ListSubscriptions",
        "sns:ListSubscriptionsByTopic",
        "sns:ListTagsForResource",
        "sns:ListTopics",
        "sns:Publish",
        "sns:Subscribe"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:sns:eu-west-1:111111111111:Story-5555",
      "Principal": {
        "AWS": ["222222222222"]
      },
      "Condition": {
        "ArnEquals": {
          "aws:PrincipalArn": [
               "arn:aws:lambda:eu-west-1:222222222222:function:New_Cross_SNS",
               "arn:aws:sts::222222222222:assumed-role:TSI_Base_FullAccess:AXXXXXXXX"
          ]
        }
      }
    }
  ]
}

確定在策略的條件部分指定哪個 ARN 的方法是從您的函數調用（並打印） get-caller-identity API。