Amazon EC2 example two - Amazon Key Management Service
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Amazon EC2 example two

In the following example, an IAM principal running an Amazon EC2 instance creates and mounts a data volume that is encrypted under a KMS key. This action generates multiple CloudTrail log records.

When the volume is created, Amazon EC2, acting on behalf of the customer, gets an encrypted data key from Amazon KMS (GenerateDataKeyWithoutPlaintext). Then it creates a grant (CreateGrant) that allows it to decrypt the data key. When the volume is mounted, Amazon EC2 calls Amazon KMS to decrypt the data key (Decrypt).

The instanceId of the Amazon EC2 instance, "i-81e2f56c", appears in the RunInstances event. The same instance ID qualifies the granteePrincipal of the grant that is created ("111122223333:aws:ec2-infrastructure:i-81e2f56c") and the assumed role that is the principal in the Decrypt call ("arn:aws:sts::111122223333:assumed-role/aws:ec2-infrastructure/i-81e2f56c").

The key ARN of the KMS key that protects the data volume, arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab, appears in all three Amazon KMS calls (CreateGrant, GenerateDataKeyWithoutPlaintext, and Decrypt).

{
  "Records": [
    {
      "eventVersion": "1.02",
      "userIdentity": {
            "type": "IAMUser",
            "principalId": "EX_PRINCIPAL_ID",
            "arn": "arn:aws:iam::111122223333:user/Alice",
            "accountId": "111122223333",
            "accessKeyId": "EXAMPLE_KEY_ID",
            "userName": "Alice"
      },
      "eventTime": "2014-11-05T21:35:27Z",
      "eventSource": "ec2.amazonaws.com",
      "eventName": "RunInstances",
      "awsRegion": "us-west-2",
      "sourceIPAddress": "192.0.2.0",
      "userAgent": "Amazon Internal",
      "requestParameters": {
        "instancesSet": {
          "items": [
            {
              "imageId": "ami-b66ed3de",
              "minCount": 1,
              "maxCount": 1
            }
          ]
        },
        "groupSet": {
          "items": [
            {
              "groupId": "sg-98b6e0f2"
            }
          ]
        },
        "instanceType": "m3.medium",
        "blockDeviceMapping": {
          "items": [
            {
              "deviceName": "/dev/xvda",
              "ebs": {
                "volumeSize": 8,
                "deleteOnTermination": true,
                "volumeType": "gp2"
              }
            },
            {
              "deviceName": "/dev/sdb",
              "ebs": {
                "volumeSize": 8,
                "deleteOnTermination": false,
                "volumeType": "gp2",
                "encrypted": true
              }
            }
          ]
        },
        "monitoring": {
          "enabled": false
        },
        "disableApiTermination": false,
        "instanceInitiatedShutdownBehavior": "stop",
        "clientToken": "XdKUT141516171819",
        "ebsOptimized": false
      },
      "responseElements": {
        "reservationId": "r-5ebc9f74",
        "ownerId": "111122223333",
        "groupSet": {
          "items": [
            {
              "groupId": "sg-98b6e0f2",
              "groupName": "launch-wizard-2"
            }
          ]
        },
        "instancesSet": {
          "items": [
            {
              "instanceId": "i-81e2f56c",
              "imageId": "ami-b66ed3de",
              "instanceState": {
                "code": 0,
                "name": "pending"
              },
              "amiLaunchIndex": 0,
              "productCodes": {
                
              },
              "instanceType": "m3.medium",
              "launchTime": 1415223328000,
              "placement": {
                "availabilityZone": "us-east-1a",
                "tenancy": "default"
              },
              "monitoring": {
                "state": "disabled"
              },
              "stateReason": {
                "code": "pending",
                "message": "pending"
              },
              "architecture": "x86_64",
              "rootDeviceType": "ebs",
              "rootDeviceName": "/dev/xvda",
              "blockDeviceMapping": {
                
              },
              "virtualizationType": "hvm",
              "hypervisor": "xen",
              "clientToken": "XdKUT1415223327917",
              "groupSet": {
                "items": [
                  {
                    "groupId": "sg-98b6e0f2",
                    "groupName": "launch-wizard-2"
                  }
                ]
              },
              "networkInterfaceSet": {
                
              },
              "ebsOptimized": false
            }
          ]
        }
      },
      "requestID": "41c4b4f7-8bce-4773-bf0e-5ae3bb5cbce2",
      "eventID": "cd75a605-2fee-4fda-b847-9c3d330ebaae",
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    },
    {
      "eventVersion": "1.02",
      "userIdentity": {
            "type": "IAMUser",
            "principalId": "EX_PRINCIPAL_ID",
            "arn": "arn:aws:iam::111122223333:user/Alice",
            "accountId": "111122223333",
            "accessKeyId": "EXAMPLE_KEY_ID",
            "userName": "Alice"
      },
      "eventTime": "2014-11-05T21:35:35Z",
      "eventSource": "kms.amazonaws.com",
      "eventName": "CreateGrant",
      "awsRegion": "us-east-1",
      "sourceIPAddress": "192.0.2.0",
      "userAgent": "Amazon Internal",
      "requestParameters": {
        "constraints": {
          "encryptionContextSubset": {
            "aws:ebs:id": "vol-f67bafb2"
          }
        },
        "granteePrincipal": "111122223333:aws:ec2-infrastructure:i-81e2f56c",
        "keyId": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab"
      },
      "responseElements": {
        "grantId": "abcde1237f76e4ba7987489ac329fbfba6ad343d6f7075dbd1ef191f0120514a"
      },
      "requestID": "41c4b4f7-8bce-4773-bf0e-5ae3bb5cbce2",
      "eventID": "c1ad79e3-0d3f-402a-b119-d5c31d7c6a6c",
      "readOnly": false,
      "resources": [
        {
          "ARN": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
          "accountId": "111122223333"
        }
      ],
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    },
    {
      "eventVersion": "1.02",
      "userIdentity": {
          "type": "IAMUser",
          "principalId": "EX_PRINCIPAL_ID",
          "arn": "arn:aws:iam::111122223333:user/Alice",
          "accountId": "111122223333",
          "accessKeyId": "EXAMPLE_KEY_ID",
          "userName": "Alice"
      },
      "eventTime": "2014-11-05T21:35:32Z",
      "eventSource": "kms.amazonaws.com",
      "eventName": "GenerateDataKeyWithoutPlaintext",
      "awsRegion": "us-east-1",
      "sourceIPAddress": "192.0.2.0",
      "userAgent": "Amazon Internal",
      "requestParameters": {
        "encryptionContext": {
          "aws:ebs:id": "vol-f67bafb2"
        },
        "numberOfBytes": 64,
        "keyId": "alias/aws/ebs"
      },
      "responseElements": null,
      "requestID": "create-111122223333-758247346-1415223332",
      "eventID": "ac3cab10-ce93-4953-9d62-0b6e5cba651d",
      "readOnly": true,
      "resources": [
        {
          "ARN": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
          "accountId": "111122223333"
        }
      ],
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    },
    {
      "eventVersion": "1.02",
      "userIdentity": {
        "type": "AssumedRole",
        "principalId": "111122223333:aws:ec2-infrastructure:i-81e2f56c",
        "arn": "arn:aws:sts::111122223333:assumed-role/aws:ec2-infrastructure/i-81e2f56c",
        "accountId": "111122223333",
        "accessKeyId": "",
        "sessionContext": {
          "attributes": {
            "mfaAuthenticated": "false",
            "creationDate": "2014-11-05T21:35:38Z"
          },
          "sessionIssuer": {
            "type": "Role",
            "principalId": "111122223333:aws:ec2-infrastructure",
            "arn": "arn:aws:iam::111122223333:role/aws:ec2-infrastructure",
            "accountId": "111122223333",
            "userName": "aws:ec2-infrastructure"
          }
        }
      },
      "eventTime": "2014-11-05T21:35:47Z",
      "eventSource": "kms.amazonaws.com",
      "eventName": "Decrypt",
      "awsRegion": "us-east-1",
      "sourceIPAddress": "192.0.2.0",
      "requestParameters": {
        "encryptionContext": {
          "aws:ebs:id": "vol-f67bafb2"
        }
      },
      "responseElements": null,
      "requestID": "b4b27883-6533-11e4-b4d9-751f1761e9e5",
      "eventID": "edb65380-0a3e-4123-bbc8-3d1b7cff49b0",
      "readOnly": true,
      "resources": [
        {
          "ARN": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
          "accountId": "111122223333"
        }
      ],
      "eventType": "AwsApiCall",
      "recipientAccountId": "111122223333"
    }
  ]
}