Regarding Guard Duty

Question

I have followed document and tried to configure the guard duty service for forwarding the logs to s3 bucket, everythings seems well but logs are not getting stored in bucket. Need help.

Answer

Does your KMS key policy grant guardduty as stated in [Guardduty Setup Documentation](https://docs.aws.amazon.com/guardduty/latest/ug/guardduty_exportfindings.html#guardduty_exportfindings-key-policy). KMS key policy would be as below:

{    
           "Sid": "AllowGuardDutyKey",
           "Effect": "Allow",
           "Principal": {
               "Service": "guardduty.amazonaws.com"
           },
           "Action": "kms:GenerateDataKey",
           "Resource": "arn:aws:kms:Region1:444455556666:key/KMSKeyId",
           "Condition": {
               "StringEquals": {
                   "aws:SourceAccount": "111122223333",
                   "aws:SourceArn":    "arn:aws:guardduty:Region2:111122223333:detector/SourceDetectorID"	
               }
           }
       }

For bucket policy, follow the section **Granting GuardDuty permissions to a bucket** in the above mentioned documentaion.

Bucket and KMS key policy are two most common places, which prevents guarduty to write logs.

Hope you find this useful.

Comment here for additional questions.

Abhishek

Regarding Guard Duty

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