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scylladb / dynamodb-pricing-comparison

Serverless application that can be deployed to AWS to collect metrics about DynamoDB usage
Apache License 2.0
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Required permissions could be restricted #4

Open julienrf opened 1 month ago

julienrf commented 1 month ago

Currently, the application requires the right to call cloudwatch:GetMetricData on any resource. Instead, we could constrain the policy to perform such calls only on the AWS/DynamoDB resource namespace.

julienrf commented 1 month ago

I tried changing the Lambda policy statement based on this:

 Effect: Allow
 Action:
   - cloudwatch:GetMetricData
 Resource:
   - "*"
+Condition:
+  StringEquals:
+    "cloudwatch:namespace": "AWS/DynamoDB"

But when the lambda runs it fails with an Access Denied error.

This might be a known limitation of AWS, according to this.