IAM Policy to Grant Read Access for a DynamoDB Stream Only (Not for the Table) - Amazon DynamoDB

IAM Policy to Grant Read Access for a DynamoDB Stream Only (Not for the Table)

When you enable DynamoDB Streams on a table, information is captured about every modification to items in the table. For more information, see Change Data Capture for DynamoDB Streams.

In some cases, you might want to prevent an application from reading data from a DynamoDB table, but still allow access to that table's streams. For example, you can configure AWS Lambda to poll a stream and invoke a Lambda function when item updates are detected, and then perform additional processing.

The following actions are available for controlling access to DynamoDB streams:

  • dynamodb:DescribeStream

  • dynamodb:GetRecords

  • dynamodb:GetShardIterator

  • dynamodb:ListStreams

The following example policy grants users permissions to access the streams of a table named GameScores. The wildcard character (*) in the ARN matches any stream associated with that table.

{ "Version": "2012-10-17", "Statement": [ { "Sid": "AccessGameScoresStreamOnly", "Effect": "Allow", "Action": [ "dynamodb:DescribeStream", "dynamodb:GetRecords", "dynamodb:GetShardIterator", "dynamodb:ListStreams" ], "Resource": "arn:aws:dynamodb:us-west-2:123456789012:table/GameScores/stream/*" } ] }

Note that this policy grants access to the GameScores table's streams, but not to the table itself.