Logging API calls for the Nitro Enclaves with Amazon CloudTrail
Amazon Nitro Enclaves is integrated with Amazon CloudTrail, a service that provides a record of actions taken by a user or role in Nitro Enclaves. CloudTrail captures Amazon KMS API calls made from enclaves as events. If you create a trail, you can enable continuous delivery of the events to an Amazon Simple Storage Service (Amazon S3) bucket. If you don't configure a trail, you can still view the most recent events in the CloudTrail console in Event history. You can use the information collected by CloudTrail to audit Amazon KMS API calls made by enclaves.
For more information about CloudTrail, see the Amazon CloudTrail User Guide.
Nitro Enclaves information in CloudTrail
CloudTrail is enabled on your Amazon account when you create the account. When supported event activity occurs in an enclave, that activity is recorded in a CloudTrail event along with other Amazon service events in Event history. You can view, search, and download recent events in your Amazon account. For more information, see Viewing Events with CloudTrail Event History.
For an ongoing record of events in your enclave, create a trail. A trail enables CloudTrail to deliver log files to an S3 bucket. By default, when you create a trail in the console, the trail applies to all Amazon Regions. The trail logs events from all Regions in the Amazon partition and delivers the log files to the S3 bucket that you specify. Additionally, you can configure other Amazon services to further analyze and act upon the event data collected in CloudTrail logs. For more information, see the following:
Nitro Enclaves supports logging the following Nitro Enclaves SDKs (that call Amazon KMS APIs) as events in CloudTrail log files:
Every event or log entry contains information about the origins of the request. Event logs generated by API calls from an enclave include the following additional fields that provide information about the identity of the enclave.
"additionalEventData": { "recipient": { "attestationDocumentModuleId": "enclave_id", "attestationDocumentEnclaveImageDigest": "PCR0" } }
Example
"additionalEventData": { "recipient": { "attestationDocumentModuleId": "i-abc12345def67890a-enc9876abcd543210ef12", "attestationDocumentEnclaveImageDigest": "7fb5c55bc2ecbb68ed99a13d7122abfc0666b926a79d5379bc58b9445c84217f59cfdd36c08b2c79552928702efe23e4" } }
Understanding Nitro Enclaves log file entries
CloudTrail log files contain one or more log entries. An event represents a single request from any source and includes information about the requested action, the date and time of the action, request parameters, and so on. CloudTrail log files aren't an ordered stack trace of the public API calls, so they don't appear in any specific order. The following examples show CloudTrail log entries for the supported actions.
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GenerateRandom
{ "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": "2014-11-04T00:52:37Z", "eventSource": "kms.amazonaws.com", "eventName": "GenerateRandom", "awsRegion": "us-east-1", "sourceIPAddress": "192.0.2.0", "userAgent": "AWS Internal", "requestParameters": null, "responseElements": null, "additionalEventData": { "recipient": { "attestationDocumentModuleId": "i-123456789abcde123-enc123456789abcde12", "attestationDocumentEnclaveImageDigest": "ee0d451a2ff9aaaa9bccd07700b9cab123a0ac2386ef7e88ad5ea6c72ebabea840957328e2ec890b408c9b06cb8ebe6a" } }, "requestID": "df1e3de6-63bc-11e4-bc2b-4198b6150d5c", "eventID": "239cb9f7-ae05-4c94-9221-6ea30eef0442", "readOnly": true, "resources": [], "eventType": "AwsApiCall", "recipientAccountId": "111122223333" } -
GenerateDataKey
{ "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": "2014-11-04T00:52:40Z", "eventSource": "kms.amazonaws.com", "eventName": "GenerateDataKey", "awsRegion": "us-east-1", "sourceIPAddress": "192.0.2.0", "userAgent": "AWS Internal", "requestParameters": { "keyId": "1234abcd-12ab-34cd-56ef-1234567890ab", "numberOfBytes": 32 }, "responseElements": null, "additionalEventData": { "recipient": { "attestationDocumentModuleId": "i-123456789abcde123-enc123456789abcde12", "attestationDocumentEnclaveImageDigest": "ee0d451a2ff9aaaa9bccd07700b9cab123a0ac2386ef7e88ad5ea6c72ebabea840957328e2ec890b408c9b06cb8ebe6a" } }, "requestID": "e0eb83e3-63bc-11e4-bc2b-4198b6150d5c", "eventID": "a9dea4f9-8395-46c0-942c-f509c02c2b71", "readOnly": true, "resources": [{ "ARN": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab", "accountId": "111122223333" }], "eventType": "AwsApiCall", "recipientAccountId": "111122223333" } -
Decrypt
{ "eventVersion": "1.05", "userIdentity": { "type": "IAMUser", "principalId": "EX_PRINCIPAL_ID", "arn": "arn:aws:iam::111122223333:user/Alice", "accountId": "111122223333", "accessKeyId": "EXAMPLE_KEY_ID", "userName": "Alice" }, "eventTime": "2020-07-27T22:58:24Z", "eventSource": "kms.amazonaws.com", "eventName": "Decrypt", "awsRegion": "us-west-2", "sourceIPAddress": "192.0.2.0", "userAgent": "AWS Internal", "requestParameters": { "encryptionAlgorithm": "SYMMETRIC_DEFAULT", "keyId": "12345ac3-fbbf-4143-abcd-28b39example" }, "responseElements": null, "additionalEventData": { "recipient": { "attestationDocumentModuleId": "i-123456789abcde123-enc123456789abcde12", "attestationDocumentEnclaveImageDigest": "ee0d451a2ff9aaaa9bccd07700b9cab123a0ac2386ef7e88ad5ea6c72ebabea840957328e2ec890b408c9b06cb8ebe6a", } }, "requestID": "b4a65126-30d5-4b28-98b9-9153da559963", "eventID": "e5a2f202-ba1a-467c-b4ba-f729d45ae521", "readOnly": true, "resources": [ { "accountId": "111122223333", "type": "AWS::KMS::Key", "ARN": "arn:aws:kms:us-east-2:111122223333:key/12345ac3-fbbf-4143-abcd-28b39example" } ], "eventType": "AwsApiCall", "recipientAccountId": "111122223333" }