Configure Flow Logs
Prisma Cloud ingests the VPC flow logs from Amazon S3 buckets stored in a logging account and makes it available for network policy alerting and visualization. While onboarding your AWS account, you need to onboard the logging account which has the S3 bucket storing VPC flow logs for the monitored account. The default retention period of flow logs is 30 days after which they are purged. You can query flow logs data for the last 30 days. Cloudwatch is the default selection to ingest flow logs and does not require additional configuration.
If you onboarded new AWS accounts after December 8, 2022 or moved existing accounts to S3 based ingestion for flow logs, you need to create a new flow log setting with the hourly (60 minutes) partition, which provides better ingestion performance than the existing 24 hours partition. Selecting additional fields on the AWS console which are used in the Internet exposure calculation in network policies address the false positives for those network policies.
When creating S3 flow logs on the AWS console, make sure to partition your flow logs for
Every 1 hour (60 minutes)
. Prisma Cloud will support the 24 hours partition timeframe till March 15, 2023.- On your AWS console, create a flow log with the following specifications:
- The new flow logs format requires all connection direction related fields. Here’s a sample format:
- Select allinstead of manually selecting each field. You can choose custom format and select the required fields.
The required fields that you need to select are:- account-id
- action
- interface-id
- srcaddr
- dstaddr
- srcport
- dstport
- protocol
- packets
- bytes
- start
- end
- log-status
- region
- version
- tcp-flags
- flow-direction
- traffic-path
- vpc-id
- subnet-id
- instance-id
- pkt-srcaddr
- pkt-dstaddr
- pkt-src-aws-service
- pkt-dst-aws-service
- SetPartition logs by timetoEvery 1 hour (60 minutes).
- SetLog file formattoText. Prisma Cloud supports ingestion of only text format files.
- You are not required to change anything on Prisma Cloud as long as the S3 bucket does not change.
Onboarded Accounts that Use S3
For your previously onboarded AWS accounts that are using S3 with 24 hours partition, you can now select hourly partition. Prisma Cloud checks whether flow logs have all the necessary permissions required for hourly partition (it does not check for the fields).
- Onboard your AWS account.
- Onboard logging account and buckets to fetch flow logs from S3.
- ClickEdit Cloud Account.
- SelectS3fromFlow Logsdropdown to configure flow logs from S3.
- Configure.
- Select from the logging accounts displayed orAdd Logging Account.
- ToConfigure Logging Accountenter anAccount ID,Account Name, andRole Name. By default, the role name isprisma-cloud-logging-role, which you can customize.All the configured Logging Accounts are displayed. You can select one of these Logging Accounts which contains the S3 bucket to which the VPC flow logs are being sent for the respective monitored account. Or you canAdda new Logging Account as described in Step 3 above.
- Select from the buckets displayed orAdd Bucket.
- ToConfigure Bucketsenter aBucket Nameand theBucket Regionthat you have configured as destination for flow logs on the AWS Logging Account VPC Console. TheBucket Path Prefix(comma separated list) andKey ARNare optional. If you have any specific path (Bucket Path) prefix for flow logs and configured bucket encryption (Key ARN), you can enter those values.If you’ve enabled hourly partitions, the files are published to the following location: bucket-and-optional-prefix/AWSLogs/account_id/vpcflowlogs/region/year/month/day/hour/In AWS, the bucket-and-optional-prefix is added to the S3 bucket ARN as a folder in the flow log settings page. Make sure you add the same bucket-and-optional-prefix in the prefix section in Prisma Cloud.
- You canAddorRemovemultiple buckets used for logging.
- Follow the steps displayed onLogging Account Template, enter theRole ARN, andValidate. You can proceed further only if the validation is successful and you see a greenValidatedcheckmark.The CFT template is deployed on the Logging Account through your AWS Management Console.
- InConfigure S3 Flowlogs, select all the applicableLogging Bucketsthat Prisma Cloud can access and ingest flow logs from.When creating S3 Flow logs on the AWS console, make sure to partition your flow logs forEvery 1 hour (60 minutes). Prisma Cloud will support theEvery 24 hourspartition timeframe till March 15, 2023.
- After selecting the Logging Buckets,Validateto make sure Prisma Cloud has all basic required permissions and access.If all the required permissions are present, aValidatedcheckmark displays. If not, an error message displays.If you want to configure a different logging account and buckets, click theEditicon.
- Save.Save your settings, regardless of the validation status.
For accounts that are using Cloudwatch and now you want to upgrade to S3, theEnable Hourly Partitioncheckbox is enabled (grayed out) by default to ensure it is using hourly partition.If you previously set Cloudwatch and want to fetch flow logs from S3 for an already onboarded AWS account, go to , click the edit icon corresponding to that AWS account, selectS3from theFlow Logsdropdown, clickConfigure, and continue from Step 2.4 above.
