Cross-account IAM role that allows Multicloud Defense to access your cloud account and take necessary actions, for example, Create EC2 instances, create load balancers, and change Route53 entries. The service principal is the Multicloud Defense-controller-account with an external id applied. Here is the IAM policy applied to the role (e.g controller role name used in this example is Multicloud Defense-controller-role ):

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "acm:DescribeCertificate",
        "aacm:ListCertificates",
        "apigateway:Get",
        "ec2:*",
        "elasticloadbalancing:*",
        "events:*",
        "globalaccelerator:*"
        "iam:ListPolicies",
        "iam:ListRoles",
        "iam:ListRoleTags",
        "logs:*",
        "route53resolver:*",
        "servicequotas:GetServiceQuota",
        "3:ListAllMyBuckets",
        "s3:ListBucket",
        "wafv2:Get*",
        "wafv2:List*,
      ],
      "Effect": "Allow",
      "Resource": "*"
    },
    {
      "Action": [
        "iam:GetRole",
        "iam:ListRolePolicies",
        "iam:GetRolePolicy"
      ],
      "Effect": "Allow",
      "Resource": [
        "arn:aws:iam::<ciscomcd-account>:role/ciscomcd-controller-role"
      ]
    },
    {
      "Effect": "Allow",
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::<S3Bucket>/*"
    },
    {
      "Action": [
        "iam:GetRole",
        "iam:ListRolePolicies",
        "iam:GetRolePolicy",
        "iam:PassRole"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:iam::<customer- account>:role/ciscomcd_firewall_role"
    },
    {
      "Action": "iam:CreateServiceLinkedRole",
      "Effect": "Allow",
      "Resource": "arn:aws:iam::*:role/aws-service-role/*"
    }
  ]
}

Service Principal:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": [
          "arn:aws:iam::<ciscomcd-account>:root"
        ]
      },
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": {
          "sts:ExternalId": "ciscomcd-external-id"
        }
      }
    }
  ]
}

Role that is assigned to the Multicloud Defense Gateway (Firewall) EC2 instances. The role gives the Gateway instance capabilities to access secretsmanager where the private keys for the application are stored, ability to decrypt keys using AWS KMS if the keys are stored in KMS, and save objects like PCAPs and technical support data onto a S3 bucket. The service principal of this role is ec2.amazonaws.com. Here is the IAM policy applied to the role:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": [
        "s3:PutObject",
        "s3:ListBucket"
      ],
      "Effect": "Allow",
      "Resource": "arn:aws:s3:::*/*"
    },
    {
      "Action": [
        "kms:Decrypt"
      ],
      "Effect": "Allow",
      "Resource": "*"
    },
    {
      "Action": [
        "secretsmanager:GetSecretValue"
      ],
      "Effect": "Allow",
      "Resource": "*"
    }
  ]
}

Tip	You can download and edit the CloudFormation template to make the policy more restrictive e.g. restricting decrypt to use a specific key, or PutObject to a defined/specific S3 bucket.

This is the role used for dynamic inventory purposes and provides the capability for the CloudTrail events to be transferred to the Controller's AWS account. It does the following:

• Put events on the event bus in the AWS account where the Multicloud Defense Controller exists.

• Send events matching the rule to the Multicloud Defense Controller's webhook server directly from the customer's AWS account.

The Service Principal for this role is events.amazonaws.com. Here is the policy applied to the role:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": "events:PutEvents",
      "Effect": "Allow",
      "Resource": [
        "arn:aws:events:*:<ciscomcd-account>:event-bus/default"
      ]
    }
  ]
}

Rule that is added to the MCDInventoryRole to put all CloudTrail inventory changes to EC2 and API gateways to be copied to the event bus on the AWS account where the Multicloud Defense Controller runs. The rule is required to match on specific event patterns that occur in the customer's AWS account. Once a match occurs, the rule states that the matched event should be sent to the webhook server (API based destination) of the controller. This rule is executed using the Multicloud DefenseMCDInventoryRole created in the previous section.

Custom Event Pattern:

{
  "detail-type": [
    "AWS API Call via CloudTrail",
    "EC2 Instance State-change Notification"
  ],
  "source": [
    "aws.ec2",
    "aws.elasticloadbalancing",
    "aws.apigateway"
  ]
}

Target:

Event Bus in another AWS Account (mcd-account) using the MCDInventoryRole