允许CloudWatch Alarm以其他帐户发送给SNS

Question

我在帐户"A"中有一个SNS主题,它是同一帐户中Lambda函数的触发器.此Lambda函数将消息发送到私有Slack通道.

只要CloudWatch警报位于同一帐户(帐户A)中,此工作正常.

但我也希望从"账户B"这样做,但我得到:

{
  "error": "Resource: arn:aws:cloudwatch:REGION:ACCOUNT_B:alarm:ALARM is not authorized to perform: SNS:Publish on resource: arn:aws:sns:REGION:ACCOUNT_A:TOPIC",
  "actionState": "Failed",
  "notificationResource": "arn:aws:sns:REGION:ACCOUNT_A:TOPIC",
  "stateUpdateTimestamp": 1495732611020,
  "publishedMessage": null
}

那么如何允许CloudWatch Alarm ARN访问权限发布到主题？

尝试添加策略失败:

Invalid parameter: Policy Error: PrincipalNotFound (Service: AmazonSNS; Status Code: 400; Error Code: InvalidParameter; Request ID: 7f5c202e-4784-5386-8dc5-718f5cc55725)

我看到其他人在https://forums.aws.amazon.com/thread.jspa?threadID=143607上遇到了同样的问题(多年前!),但它从未得到过回答.

更新:

试图解决这个问题,我现在正在尝试使用本地SNS主题,然后将其发送到删除帐户.但是,我仍然得到:

"error": "Resource: arn:aws:cloudwatch:REGION:LOCAL_ACCOUNT:alarm:ALARM is not authorized to perform: SNS:Publish on resource: arn:aws:sns:REGION:LOCAL_ACCOUNT:TOPIC"

这个,这个SNS政策:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AllowLambdaAccountToSubscribe",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::REMOTE_ACCOUNT:root"
      },
      "Action": [
        "sns:Subscribe",
        "sns:Receive"
      ],
      "Resource": "arn:aws:sns:REGION:LOCAL_ACCOUNT:TOPIC"
    },
    {
      "Sid": "AllowLocalAccountToPublish",
      "Effect": "Allow",
      "Principal": "*",
      "Action": "sns:Publish",
      "Resource": "arn:aws:sns:REGION:LOCAL_ACCOUNT:TOPIC",
      "Condition": {
        "StringEquals": {
          "AWS:SourceAccount": "LOCAL_ACCOUNT"
        }
      }
    }
  ]
}

如果我手动向发布到主题的主题发送消息,我可以看到它到达Lambda函数,因此除了CloudWatch访问权限之外的所有内容.

Answer 1

通过反复试验，我发现这是不起作用的条件。因为某些原因。不确定为什么看不到源帐户...

更广泛的政策使其得以发挥作用：

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AllowLambdaAccountToSubscribe",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::REMOTE_ACCOUNT:root"
      },
      "Action": [
        "sns:Subscribe",
        "sns:Receive"
      ],
      "Resource": "arn:aws:sns:REGION:LOCAL_ACCOUNT:TOPIC"
    },
    {
      "Sid": "AllowLocalAccountToPublish",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "sns:Publish",
      "Resource": "arn:aws:sns:REGION:LOCAL_ACCOUNT:TOPIC",
      "Condition": {
        "StringEquals": {
          "AWS:SourceAccount": "LOCAL_ACCOUNT"
        }
      }
    },
    {
      "Sid": "AllowCloudWatchAlarmsToPublish",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "sns:Publish",
      "Resource": "arn:aws:sns:REGION:LOCAL_ACCOUNT:TOPIC",
      "Condition": {
        "ArnLike": {
          "AWS:SourceArn": "arn:aws:cloudwatch:REGION:LOCAL_ACCOUNT:alarm:*"
        }
      }
    }
  ]
}