Configure Config inputs for the Splunk Add-on for AWS

Complete the steps to configure Config inputs for the Splunk Add-on for Amazon Web Services (AWS):

1. You must manage accounts for the add-on as a prerequisite. See Manage accounts for the Splunk Add-on for AWS.
2. Configure AWS services for the Config input.
3. Configure AWS permissions for the Config input.
4. Configure Config inputs either through Splunk Web or configuration files.

Best practices for configuring inputs

• Configure Simple Queue Service (SQS)-based S3 inputs to collect AWS data.
• Configure an AWS Config input for the Splunk Add-on for Amazon Web Services on your data collection node through Splunk Web. This data source is available only in a subset of AWS regions, which does not include China. See http://docs.aws.amazon.com/general/latest/gr/rande.html#awsconfig_region for a full list of supported regions.
• Configure a single enabled Config modular input for each unique SQS. Multiple enabled modular inputs can cause conflicts when trying to delete SQS messages or S3 records that another modular input is attempting to access and parse.
• Disable or delete testing configurations before releasing your configuration in production.

Supported Config input message types

The following message types are supported by the Config inputs for the Splunk Add-on for AWS:

• ConfigurationHistoryDeliveryCompleted
• ConfigurationSnapshotDeliveryCompleted
• ConfigurationItemChangeNotification
• OversizedConfigurationItemChangeNotification

Configure AWS permissions for the Config input

Set the following permissions in your AWS configuration:

• For the S3 bucket that collects your Config logs:
  • GetObject
  • GetBucketLocation
  • ListBucket
  • ListAllMyBuckets

• For the SQS subscribed to the SNS Topic that collects Config notifications:
  • GetQueueAttributes
  • ListQueues
  • ReceiveMessage
  • GetQueueUrl
  • SendMessage
  • DeleteMessage

• For the Config snapshots: DeliverConfigSnapshot

• For the IAM user to get the Config snapshots: GetUser

See the following sample inline policy to configure Config input permissions:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow", 
            "Action": [
                "s3:ListBucket",
                "s3:GetObject",
                "s3:GetBucketLocation",
                "s3:ListAllMyBuckets"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow", 
            "Action": [
                "sqs:ListQueues",
                "sqs:ReceiveMessage",
                "sqs:GetQueueAttributes",
                "sqs:SendMessage",
                "sqs:GetQueueUrl",
                "sqs:DeleteMessage"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "config:DeliverConfigSnapshot" 
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iam:GetUser"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

For more information and sample policies, see the following AWS documentation:

• For SQS, see http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/UsingIAM.html.
• For S3, see http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-access-control.html.

Configure a Config input using Splunk Web

To configure inputs using Splunk Web:

1. Click Splunk Add-on for AWS in the navigation bar on Splunk Web home.
2. Click Create New Input > Config > Config.
3. Fill out the fields as described in the table:

Field in Splunk Web	Description
AWS Account	The AWS account or EC2 IAM role the Splunk platform uses to access your Config data. In Splunk Web, select an account from the drop-down list.
AWS Region	The AWS region that contains the log notification SQS queue. Enter the region ID. See http://docs.aws.amazon.com/general/latest/gr/rande.html#d0e371.
SQS queue name	The name of the queue to which AWS sends new Config notifications. Select a queue from the drop-down list, or enter the queue name manually. The queue name is the final segment of the full queue URL. For example, if your SQS queue URL is http://sqs.us-east-1.amazonaws.com/123456789012/testQueue, then your SQS queue name is testQueue.
Source type	A source type for the events. Enter a value only if you want to override the default of aws:config. Event extraction relies on the default value of source type. If you change the default value, you must update props.conf as well. The Splunk platform indexes AWS Config events using three variations of this source type: Configuration snapshots are indexed as sourcetype=aws:config. Configuration change notifications, such as ConfigurationItemChangeNotification and OversizedConfigurationItemChangeNotification, are indexed as sourcetype=aws:config:notification. Logs from aws_config.log are indexed as sourcetype=aws:config:log.
Index	The index name where the Splunk platform puts the Config data. The default is main.
Interval	The number of seconds to wait before the Splunk platform runs the command again. The default is 30 seconds.

Configure a Config input using configuration files

To configure inputs manually in inputs.conf, create a stanza using the following template and add it to $SPLUNK_HOME/etc/apps/Splunk_TA_aws/local/inputs.conf. If the file or path does not exist, create it.

[aws_config://<name>]
aws_account = <value>
aws_region = <value>
sqs_queue = <value>
interval = <value>
sourcetype = <value>
index = <value>

Some of these settings have default values that can be found in $SPLUNK_HOME/etc/apps/Splunk_TA_aws/default/inputs.conf:

[aws_config]
aws_account =
sourcetype = aws:config
queueSize = 128KB
persistentQueueSize = 24MB
interval = 30 

The previous values correspond to the default values in Splunk Web as well as some internal values that are not exposed in Splunk Web for configuration. If you choose to copy this stanza to /local and use it as a starting point to configure your inputs.conf manually, change the stanza title from aws_config to aws_config://<name> and add the additional parameters that you need.