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Graph/aws-s3-iam-sdk-footguns

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AWS S3 IAM/SDK Footguns

aws-s3-iam-sdk-footguns

S3 operations fail or behave inconsistently because IAM resource ARNs, prefix scoping, replication configuration, and SDK/runtime assumptions (headers, pagination) don’t match AWS semantics, leading to partial listings, access mismatches, or broken replication that is hard to reproduce.

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Updated7/14/2026

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30 linked nodes

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Double check the Cognito client's data against the data in AWS

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my suggestion is to upgrade to the latest SDK, in your case boto3 — use of an older SDK that's incompatible with some server-side change e.g. to S3's HTTP header expectations. Tension: sometimes caused by the use of an older SDK. Outcome: upgrade to the latest SDK, in your case boto3.

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I was able to resolve this by using Cloudwatch EventBridge to monitor S3 CreateObject event and use that as a trigger. Tension: Once I removed the S3 trigger. Outcome: it works perfectly now.

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view an object's S3 Intelligent Tiering access tier through an S3 Inventory report — Configure S3 Inventory. Tension: This can be enabled on a bucket or prefix level and is generated on a daily or weekly frequency. Outcome: download the file from the S3 Inventory output location and parse if locally or query it via Athena.

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Add a policy to the IAM Role that is assigned to the Lambda function — If Alexa is successfully invoking your AWS Lambda function, but the Lambda function is having problems accessing content from Amazon S3. Outcome: The policy should grant the Lambda function permission to access the s3 bucket.

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you could also specify a condition on the policy so the resources accessible to the role fall under a specific prefix — The examples at https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_variables.html. Tension: I think your solution might be to use variables in the IAM Policy document and identify the role from there. Outcome: specify a condition on the policy so the resources accessible to the role fall under a specific prefix.

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just `amazonS3FullAccess` — By new role you mean `Task IAM Role` and not `Task execution IAM role`. Tension: Just S3FullAcess is too permissive (for production env). Outcome: Yes you can remove `AmazonECSTaskExecutionRolePolicy` from `Task IAM role` and add s3 permissions.

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`aws s3 cp --recursive s3:///` — AWS CLI copy local file to S3 cloud giving errors. Outcome: `aws s3 cp --recursive s3:///`.

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Be sure to print the bucket name before calling the SDK — before calling the SDK. Tension: to be sure that 'the resource' to which access is denied is as expected. Outcome: the AWS error message is therefore correct.

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I wrote (borrowed) the following code. Tension: I couldn't get it to work with AWS s3. Outcome: successfully returns an AWS S3 object using header authentication.

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you need to add the kms key id — aws_s3_bucket_replication_configuration. Tension: encrypted objects aren't being replicated. Outcome: replica_kms_key_id is not specified in the replication configuration.

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Check and update the iOS/S3 request authentication configuration (IAM permissions/credentials and Amplify storage settings) for iOS 18 beta. If the issue persists, use the AWS SDK for Swift to interact with S3 instead of Amplify Flutter.

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update to AWS SDK for Java V2 ASAP — when using V2 to upload larger files. Tension: The Amazon S3 Transfer Manager API can certainly handle larger files. Outcome: use software.amazon.awssdk.transfer.s3.S3TransferManager API.

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had success just using the v4 request signer — using the S3 protocol in Golang. Outcome: calling s3 myself like below.

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I needed to use the MultipartCopy class found in the S3 SDK. Tension: Over 4.5 GB - Use MultipartCopy. Outcome: This is now working...

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Have you tried using the v4 token signing process on Cloud CDN? — No need to expose your S3 bucket publicly. Tension: Cloud CDN will be sending the "published hostname" towards the origin destination. Outcome: This will generate an emphemal access token to access a private AWS S3 bucket using your AWS IAM credentials.

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Change the S3 event configuration to use a broader object creation event such as “All Object Create Events” (e.g., s3:ObjectCreated:*) so the Lambda triggers for typical PutObject-based uploads.

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Please review my Lambda function code and help me identify the issue? — I have verified the environment variables, IAM permissions, and the input event JSON. Outcome: I suspect there might be an issue with my Lambda function.

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Therefore, you need to tell the AWS SDK to not sign the request.

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Temporarily tweak the replication settings of your S3 bucket — Upload a test file to the source bucket in the active region. Tension: Since we intentionally modified the replication configuration, this action is expected to lead to a replication failure. Outcome: After completing the testing phase, restore the replication configuration to its original state to return to normal replication behavior.

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override the copy method, and use your own marshaller — inherit the AmazonS3Client class. Tension: your operations will succeed, although the tags behavior will not match the one you would expect with S3. Outcome: your operations will succeed, although the tags behavior will not match the one you would expect with S3.

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Bucket ARN can also be retrieved via `Fn::GetAtt` to avoid these errors. Tension: Bucket ARN can also be retrieved via `Fn::GetAtt` to avoid these errors. Outcome: Resource: !Join [ '/', [{"Fn::GetAtt": [S3Bucket, Arn]}, '*']].

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Create an IAM policy in account A with Full S3 access and generate the programmatic access keys — SSH to ec2 in account B, and install AWS-CLI. Tension: Could you please guide me with the necessary IAM policy or the list of procedures to be followed to achieve this? Outcome: Run the following command to copy all the files to S3 bucket.

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Use the AWS SDK to call AssumeRole, then pass the returned temporary credentials to S3Client

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modifying the actions do not seem to help, nor does using the wildcard * in the Resource element — AWS CDK for Python.

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Downgrading to @aws-sdk/client-s3@3.317.0 fixed the issue for me — AWS SDK V3 in my Nextjs application to upload files to s3. Tension: the latest version of the @aws-sdk/client-s3. Outcome: fixed the issue for me.

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There's an extra array in input of your S3 client instantiation. — const s3Client = new S3Client({. Tension: Here's the correct syntax:. Outcome: const s3Client = new S3Client({ region:'eu-central-1', credentials: { accessKeyId: ACCESS_KEY_ID, secretAccessKey: ACCESS_KEY_SECRET } });.

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Check AWS documentation (2023 version) — for more tips related to lifecycle rules. Outcome: newly created S3 lifecycle rules do apply to both new and preexisting objects.

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AWS Step Functions has a built-in pattern to process items in S3 — iterate over all the objects in a chosen bucket (or folder, etc.) that match your description. Tension: This would iterate over all the objects in a chosen bucket (or folder, etc.) that match your description. Outcome: Each object could then be sent to a Lambda function to save its contents to OpenSearch.

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Grant the deploying principal (the IAM user/role or CloudFormation execution role) permission to perform s3:PutBucketPolicy on the target bucket (and any required related S3 permissions). Alternatively, configure the Serverless deployment permissions/CloudFormation role to include s3:PutBucketPolicy and redeploy.

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