AWS Lambda 的靜態資料加密 - AWS Lambda
監控 Lambda 的加密金鑰

AWS Lambda 的靜態資料加密

Lambda 一律使用 AWS 擁有的金鑰或 AWS 受管金鑰 為下列資源提供靜態加密：

  • 環境變數

  • 您上傳到 Lambda 的檔案，包括部署套件和層封存

  • 事件來源映射篩選條件物件

您可以選擇將 Lambda 設定為使用客戶受管金鑰來加密環境變數、.zip 部署套件和篩選條件物件。

根據預設，Amazon CloudWatch Logs 和 AWS X-Ray 也可加密資料，並可設定為使用客戶受管金鑰。如需詳細資訊，請參閱在 CloudWatch Logs 中加密日誌資料和AWS X-Ray 中的資料保護。

監控 Lambda 的加密金鑰

當您搭配 Lambda 使用 AWS KMS 客戶受管金鑰時，您可以使用 AWS CloudTrail。下列範例是 Lambda 為存取客戶受管金鑰加密的資料而進行的 Decrypt、 DescribeKey 和 GenerateDataKey 呼叫的 CloudTrail 事件。

Decrypt

如果您使用 AWS KMS 客戶受管金鑰來加密篩選條件物件，Lambda 會在您嘗試以純文字存取該金鑰時 (例如，從 ListEventSourceMappings 呼叫)，代表您傳送 Decrypt 請求。下面的範例事件會記錄 Decrypt 操作：

{
    "eventVersion": "1.09",
    "userIdentity": {
        "type": "AssumedRole",
        "principalId": "AROA123456789EXAMPLE:example",
        "arn": "arn:aws:sts::123456789012:assumed-role/role-name/example",
        "accountId": "123456789012",
        "accessKeyId": "ASIAIOSFODNN7EXAMPLE",
        "sessionContext": {
            "sessionIssuer": {
                "type": "Role",
                "principalId": "AROA123456789EXAMPLE",
                "arn": "arn:aws:iam::123456789012:role/role-name",
                "accountId": "123456789012",
                "userName": "role-name"
            },
            "attributes": {
                "creationDate": "2024-05-30T00:45:23Z",
                "mfaAuthenticated": "false"
            }
        },
        "invokedBy": "lambda.amazonaws.com"
    },
    "eventTime": "2024-05-30T01:05:46Z",
    "eventSource": "kms.amazonaws.com",
    "eventName": "Decrypt",
    "awsRegion": "eu-west-1",
    "sourceIPAddress": "lambda.amazonaws.com",
    "userAgent": "lambda.amazonaws.com",
    "requestParameters": {
        "keyId": "arn:aws:kms:eu-west-1:123456789012:key/a1b2c3d4-5678-90ab-cdef-EXAMPLE11111",
        "encryptionContext": {
            "aws-crypto-public-key": "ABCD+7876787678+CDEFGHIJKL/888666888999888555444111555222888333111==",
            "aws:lambda:EventSourceArn": "arn:aws:sqs:eu-west-1:123456789012:sample-source",
            "aws:lambda:FunctionArn": "arn:aws:lambda:eu-west-1:123456789012:function:sample-function"
        },
        "encryptionAlgorithm": "SYMMETRIC_DEFAULT"
    },
    "responseElements": null,
    "requestID": "a1b2c3d4-5678-90ab-cdef-EXAMPLEaaaaa",
    "eventID": "a1b2c3d4-5678-90ab-cdef-EXAMPLEbbbbb",
    "readOnly": true,
    "resources": [
        {
            "accountId": "AWS Internal",
            "type": "AWS::KMS::Key",
            "ARN": "arn:aws:kms:eu-west-1:123456789012:key/a1b2c3d4-5678-90ab-cdef-EXAMPLE11111"
        }
    ],
    "eventType": "AwsApiCall",
    "managementEvent": true,
    "recipientAccountId": "123456789012",
    "eventCategory": "Management",
    "sessionCredentialFromConsole": "true"
}
DescribeKey

如果您使用 AWS KMS 客戶受管金鑰來加密篩選條件物件，Lambda 會在您嘗試存取該金鑰時 (例如，從 GetEventSourceMapping 呼叫)，代表您傳送 DescribeKey 請求。下面的範例事件會記錄 DescribeKey 操作：

{
    "eventVersion": "1.09",
    "userIdentity": {
        "type": "AssumedRole",
        "principalId": "AROA123456789EXAMPLE:example",
        "arn": "arn:aws:sts::123456789012:assumed-role/role-name/example",
        "accountId": "123456789012",
        "accessKeyId": "ASIAIOSFODNN7EXAMPLE",
        "sessionContext": {
            "sessionIssuer": {
                "type": "Role",
                "principalId": "AROA123456789EXAMPLE",
                "arn": "arn:aws:iam::123456789012:role/role-name",
                "accountId": "123456789012",
                "userName": "role-name"
            },
            "attributes": {
                "creationDate": "2024-05-30T00:45:23Z",
                "mfaAuthenticated": "false"
            }
        }
    },
    "eventTime": "2024-05-30T01:09:40Z",
    "eventSource": "kms.amazonaws.com",
    "eventName": "DescribeKey",
    "awsRegion": "eu-west-1",
    "sourceIPAddress": "54.240.197.238",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36",
    "requestParameters": {
        "keyId": "a1b2c3d4-5678-90ab-cdef-EXAMPLE11111"
    },
    "responseElements": null,
    "requestID": "a1b2c3d4-5678-90ab-cdef-EXAMPLEaaaaa",
    "eventID": "a1b2c3d4-5678-90ab-cdef-EXAMPLEbbbbb",
    "readOnly": true,
    "resources": [
        {
            "accountId": "AWS Internal",
            "type": "AWS::KMS::Key",
            "ARN": "arn:aws:kms:eu-west-1:123456789012:key/a1b2c3d4-5678-90ab-cdef-EXAMPLE11111"
        }
    ],
    "eventType": "AwsApiCall",
    "managementEvent": true,
    "recipientAccountId": "123456789012",
    "eventCategory": "Management",
    "tlsDetails": {
        "tlsVersion": "TLSv1.3",
        "cipherSuite": "TLS_AES_256_GCM_SHA384",
        "clientProvidedHostHeader": "kms.eu-west-1.amazonaws.com"
    },
    "sessionCredentialFromConsole": "true"
}
GenerateDataKey

當您使用 AWS KMS 客戶受管金鑰來加密 CreateEventSourceMapping 或 UpdateEventSourceMapping 呼叫中的篩選條件物件時，Lambda 會代表您傳送 GenerateDataKey 請求，以產生資料金鑰來加密篩選條件 (封套加密)。下面的範例事件會記錄 GenerateDataKey 操作：

{
    "eventVersion": "1.09",
    "userIdentity": {
        "type": "AssumedRole",
        "principalId": "AROA123456789EXAMPLE:example",
        "arn": "arn:aws:sts::123456789012:assumed-role/role-name/example",
        "accountId": "123456789012",
        "accessKeyId": "ASIAIOSFODNN7EXAMPLE",
        "sessionContext": {
            "sessionIssuer": {
                "type": "Role",
                "principalId": "AROA123456789EXAMPLE",
                "arn": "arn:aws:iam::123456789012:role/role-name",
                "accountId": "123456789012",
                "userName": "role-name"
            },
            "attributes": {
                "creationDate": "2024-05-30T00:06:07Z",
                "mfaAuthenticated": "false"
            }
        },
        "invokedBy": "lambda.amazonaws.com"
    },
    "eventTime": "2024-05-30T01:04:18Z",
    "eventSource": "kms.amazonaws.com",
    "eventName": "GenerateDataKey",
    "awsRegion": "eu-west-1",
    "sourceIPAddress": "lambda.amazonaws.com",
    "userAgent": "lambda.amazonaws.com",
    "requestParameters": {
        "numberOfBytes": 32,
        "keyId": "arn:aws:kms:eu-west-1:123456789012:key/a1b2c3d4-5678-90ab-cdef-EXAMPLE11111",
        "encryptionContext": {
            "aws-crypto-public-key": "ABCD+7876787678+CDEFGHIJKL/888666888999888555444111555222888333111==",
            "aws:lambda:EventSourceArn": "arn:aws:sqs:eu-west-1:123456789012:sample-source",
            "aws:lambda:FunctionArn": "arn:aws:lambda:eu-west-1:123456789012:function:sample-function"
        },
    },
    "responseElements": null,
    "requestID": "a1b2c3d4-5678-90ab-cdef-EXAMPLEaaaaa",
    "eventID": "a1b2c3d4-5678-90ab-cdef-EXAMPLEbbbbb",
    "readOnly": true,
    "resources": [
        {
            "accountId": "AWS Internal",
            "type": "AWS::KMS::Key",
            "ARN": "arn:aws:kms:eu-west-1:123456789012:key/a1b2c3d4-5678-90ab-cdef-EXAMPLE11111"
        }
    ],
    "eventType": "AwsApiCall",
    "managementEvent": true,
    "recipientAccountId": "123456789012",
    "eventCategory": "Management"
}