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Question 164 - SCS-C02 discussion

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A company has two AWS accounts. One account is for development workloads. The other account is for production workloads. For compliance reasons the production account contains all the AWS Key Management. Service (AWS KMS) keys that the company uses for encryption.

The company applies an IAM role to an AWS Lambda function in the development account to allow secure access to AWS resources. The Lambda function must access a specific KMS customer managed key that exists in the production account to encrypt the Lambda function's data.

Which combination of steps should a security engineer take to meet these requirements? (Select TWO.)

A.
Configure the key policy for the customer managed key in the production account to allow access to the Lambda service.
Answers
A.
Configure the key policy for the customer managed key in the production account to allow access to the Lambda service.
B.
Configure the key policy for the customer managed key in the production account to allow access to the IAM role of the Lambda function in the development account.
Answers
B.
Configure the key policy for the customer managed key in the production account to allow access to the IAM role of the Lambda function in the development account.
C.
Configure a new IAM policy in the production account with permissions to use the customer managed key. Apply the IAM policy to the IAM role that the Lambda function in the development account uses.
Answers
C.
Configure a new IAM policy in the production account with permissions to use the customer managed key. Apply the IAM policy to the IAM role that the Lambda function in the development account uses.
D.
Configure a new key policy in the development account with permissions to use the customer managed key. Apply the key policy to the IAM role that the Lambda function in the development account uses.
Answers
D.
Configure a new key policy in the development account with permissions to use the customer managed key. Apply the key policy to the IAM role that the Lambda function in the development account uses.
E.
Configure the IAM role for the Lambda function in the development account by attaching an IAM policy that allows access to the customer managed key in the production account.
Answers
E.
Configure the IAM role for the Lambda function in the development account by attaching an IAM policy that allows access to the customer managed key in the production account.
Suggested answer: B, E

Explanation:

To allow a Lambda function in one AWS account to access a KMS customer managed key in another AWS account, the following steps are required:

Configure the key policy for the customer managed key in the production account to allow access to the IAM role of the Lambda function in the development account. A key policy is a resource-based policy that defines who can use or manage a KMS key. To grant cross-account access to a KMS key, you must specify the AWS account ID and the IAM role ARN of the external principal in the key policy statement. For more information, see Allowing users in other accounts to use a KMS key.

Configure the IAM role for the Lambda function in the development account by attaching an IAM policy that allows access to the customer managed key in the production account. An IAM policy is an identity-based policy that defines what actions an IAM entity can perform on which resources. To allow an IAM role to use a KMS key in another account, you must specify the KMS key ARN and the kms:Encrypt action (or any other action that requires access to the KMS key) in the IAM policy statement. For more information, see Using IAM policies with AWS KMS.

This solution will meet the requirements of allowing secure access to a KMS customer managed key across AWS accounts.

The other options are incorrect because they either do not grant cross-account access to the KMS key (A, C), or do not use a valid policy type for KMS keys (D).

Verified

Reference:

https://docs.aws.amazon.com/kms/latest/developerguide/key-policy-modifying-external-accounts.html

https://docs.aws.amazon.com/kms/latest/developerguide/iam-policies.html

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asked 16/09/2024
Daniel Yamamoto
43 questions
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