[Solved] You wrote this IAM policy to restrict access to items with partition key 'user456', but users still access other items:{ "Effect": "Allow", "Action": "dynamodb:GetItem", "Resource":... | DynamoDB

DynamoDB - Security and Access Control

You wrote this IAM policy to restrict access to items with partition key 'user456', but users still access other items:

{
  "Effect": "Allow",
  "Action": "dynamodb:GetItem",
  "Resource": "arn:aws:dynamodb:us-east-1:123456789012:table/Orders",
  "Condition": {
    "StringEquals": {
      "dynamodb:LeadingKeys": "user456"
    }
  }
}

What is the likely error?

AAction should be dynamodb:Query instead of GetItem

BResource ARN is incorrect

CEffect should be Deny instead of Allow

DCondition should use ForAllValues:StringEquals with an array

Step-by-Step Solution

Solution:

Step 1: Check condition syntax for dynamodb:LeadingKeys
The condition expects an array with ForAllValues:StringEquals, not a single string with StringEquals.
Step 2: Understand impact of incorrect condition
Using StringEquals with a string causes the condition to be ignored, allowing broader access.
Final Answer:
Condition should use ForAllValues:StringEquals with an array -> Option D
Quick Check:
Use ForAllValues:StringEquals and array for LeadingKeys [OK]

Quick Trick: Use ForAllValues:StringEquals with array for LeadingKeys [OK]

Common Mistakes:

MISTAKES

Using StringEquals with a string instead of array
Incorrect ARN format
Confusing action types
Changing Effect to Deny unnecessarily

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More DynamoDB Quizzes

You wrote this IAM policy to restrict access to items with partition key 'user456', but users still access other items:

Step 1: Check condition syntax for dynamodb:LeadingKeys

Step 2: Understand impact of incorrect condition

Final Answer:

Quick Check:

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