AWS Kinesis is a platform on AWS to collect, process, and analyze real-time, streaming data. It allows developers to build applications that can continuously ingest and process large streams of data records in real time. Kinesis is commonly used for real-time analytics, log and event data collection, and more.
When working with AWS Kinesis, you might encounter the KMSAccessDeniedException. This error typically manifests when your application attempts to access a Kinesis stream that is encrypted with a KMS key, but lacks the necessary permissions.
The error message might look like this:
KMSAccessDeniedException: User: arn:aws:iam::123456789012:user/ExampleUser is not authorized to perform: kms:Decrypt on resource: arn:aws:kms:us-east-1:123456789012:key/abcd1234-a123-456a-a12b-a123b4cd56ef
The KMSAccessDeniedException indicates that the IAM role or user trying to access the Kinesis stream does not have the required permissions to use the KMS key for decryption. This is crucial because Kinesis streams can be configured to encrypt data at rest using AWS KMS keys, ensuring data security.
The root cause of this issue is typically insufficient permissions in the IAM policy attached to the user or role accessing the Kinesis stream. Without the correct permissions, AWS KMS will deny access to the key, resulting in the exception.
To resolve the KMSAccessDeniedException, follow these steps:
Ensure that the IAM role or user has the necessary permissions to access the KMS key. You need to add permissions for the kms:Decrypt action. Here is an example policy snippet:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "kms:Decrypt",
"Resource": "arn:aws:kms:us-east-1:123456789012:key/abcd1234-a123-456a-a12b-a123b4cd56ef"
}
]
}
Attach the updated policy to the IAM role or user that is accessing the Kinesis stream. You can do this via the AWS Management Console or using the AWS CLI:
aws iam put-role-policy --role-name ExampleRole --policy-name KMSAccessPolicy --policy-document file://policy.json
After updating the permissions, test the configuration by attempting to access the Kinesis stream again. If the permissions are correctly set, the error should no longer occur.
For more information on AWS KMS and IAM policies, consider visiting the following resources:
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