Source account role Destination account role

IAM roles for cross account delivery

When you publish to Amazon Data Firehose, you can choose a delivery stream that's in the same account as the resource to monitor (the source account), or in a different account (the destination account). To enable cross account delivery of flow logs to Amazon Data Firehose, you must create an IAM role in the source account and an IAM role in the destination account.

Source account role

In the source account, create a role that grants the following permissions. In this example, the name of the role is mySourceRole, but you can choose a different name for this role. The last statement allows the role in the destination account to assume this role. The condition statements ensure that this role is passed only to the log delivery service, and only when monitoring the specified resource. When you create your policy, specify the VPCs, network interfaces, or subnets that you're monitoring with the condition key iam:AssociatedResourceARN.


{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "iam:PassRole",
      "Resource": "arn:aws-cn:iam::source-account:role/mySourceRole",
      "Condition": {
          "StringEquals": {
              "iam:PassedToService": "delivery.logs.amazonaws.com"
          },
          "StringLike": {
              "iam:AssociatedResourceARN": [
                  "arn:aws-cn:ec2:region:source-account:vpc/vpc-00112233344556677"
              ]
          }
      }
    },
    {
      "Effect": "Allow",
      "Action": [
          "logs:CreateLogDelivery",
          "logs:DeleteLogDelivery",
          "logs:ListLogDeliveries",
          "logs:GetLogDelivery"
      ],
      "Resource": "*"
    },
    {
      "Effect": "Allow",
      "Action": "sts:AssumeRole",
      "Resource": "arn:aws-cn:iam::destination-account:role/AWSLogDeliveryFirehoseCrossAccountRole"      
    }
  ]
}

Ensure that this role has the following trust policy, which allows the log delivery service to assume the role.


{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "delivery.logs.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

From the source account, use the following procedure to create the role.

To create the source account role

Open the IAM console at https://console.amazonaws.cn/iam/.
In the navigation pane, choose Policies.
Choose Create policy.
On the Create policy page, do the following:
1. Choose JSON.
2. Replace the contents of this window with the permissions policy at the start of this section.
3. Choose Next.
4. Enter a name for your policy and an optional description and tags, and then choose Create policy.
In the navigation pane, choose Roles.
Choose Create role.
For Trusted entity type, choose Custom trust policy. For Custom trust policy, replace "Principal": {}, with the following, which specifies the log delivery service. Choose Next.
```
"Principal": {
   "Service": "delivery.logs.amazonaws.com"
},
```
On the Add permissions page, select the checkbox for the policy that you created earlier in this procedure, and then choose Next.
Enter a name for your role and optionally provide a description.
Choose Create role.

Destination account role

In the destination account, create a role with a name that starts with AWSLogDeliveryFirehoseCrossAccountRole. This role must grant the following permissions.


{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
          "iam:CreateServiceLinkedRole",
          "firehose:TagDeliveryStream"
      ],
      "Resource": "*"
    }
  ]
}

Ensure that this role has the following trust policy, which allows the role that you created in the source account to assume this role.


{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
          "AWS": "arn:aws-cn:iam::source-account:role/mySourceRole"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

From the destination account, use the following procedure to create the role.

To create the destination account role

Open the IAM console at https://console.amazonaws.cn/iam/.
In the navigation pane, choose Policies.
Choose Create policy.
On the Create policy page, do the following:
1. Choose JSON.
2. Replace the contents of this window with the permissions policy at the start of this section.
3. Choose Next.
4. Enter a name for your policy that starts with AWSLogDeliveryFirehoseCrossAccountRole, and then choose Create policy.
In the navigation pane, choose Roles.
Choose Create role.
For Trusted entity type, choose Custom trust policy. For Custom trust policy, replace "Principal": {}, with the following, which specifies the source account role. Choose Next.
```
"Principal": {
   "AWS": "arn:aws-cn:iam::source-account:role/mySourceRole"
},
```
On the Add permissions page, select the checkbox for the policy that you created earlier in this procedure, and then choose Next.
Enter a name for your role and optionally provide a description.
Choose Create role.

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Publish to Amazon Data Firehose

Create a flow log that publishes to Amazon Data Firehose