DynamoDB - Security and Access Control
A policy uses this condition: {"StringEquals": {"dynamodb:LeadingKeys": "${aws:userid}"}} but users cannot access their items. What is the most probable cause?
A policy uses this condition: {"StringEquals": {"dynamodb:LeadingKeys": "${aws:userid}"}} but users cannot access their items. What is the most probable cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Check Variable Usage
"${aws:userid}" is a valid variable for user identity in IAM policies.Step 2: Validate Condition Key Usage
"dynamodb:LeadingKeys" accepts a string or list; a single string is valid.Step 3: Consider Permissions
Access errors often occur if the policy lacks the necessary DynamoDB action permissions (e.g., dynamodb:GetItem).Final Answer:
The IAM policy is missing the required action permissions for DynamoDB. -> Option AQuick Check:
Missing action permissions cause access denial [OK]
Quick Trick: Ensure both condition and action permissions are set [OK]
Common Mistakes:
MISTAKES- Assuming variable aws:userid is invalid
- Believing dynamodb:LeadingKeys must be a list
- Ignoring required DynamoDB action permissions
Master "Security and Access Control" in DynamoDB
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