S3 actions accross regions

Question

I have two accounts with AWS.  I want to copy a folder of objects from one S3 bucket to another.  The source bucket is in Canada and the Destination is in US-East-1.  I have the profiles configured and confirmed working on their respective accounts.  I'm getting  a 403-forbidden error when calling the HeadObject operation.

This is the code:
""" s3 copy """
import boto3
from botocore.exceptions import ClientError

def create_s3_client(aws_profile, region_name):
    session = boto3.Session(profile_name=aws_profile, region_name=region_name)
    return session.client('s3')

def copy_files_between_buckets(source_s3_client, dest_s3_client, source_bucket, dest_bucket, prefix=''):
    try:
        objects = source_s3_client.list_objects_v2(Bucket=source_bucket, Prefix=prefix)
        for obj in objects.get('Contents', []):
            copy_source = {
                'Bucket': source_bucket,
                'Key': obj['Key']
            }
            file_key = obj['Key']
            print(f"Copying {file_key} to {dest_bucket}")
            dest_s3_client.copy(copy_source, dest_bucket, file_key)
    except ClientError as e:
        print(f"An error occurred: {e}")

def main():
    source_profile = 'dair'
    source_region = 'ca-central-1'
    source_bucket = 'dource-bucket'
    
    dest_profile = 'default'
    dest_region = 'us-east-1'
    dest_bucket ='destin-bucket'

source_s3_client = create_s3_client(source_profile, source_region)
    dest_s3_client = create_s3_client(dest_profile, dest_region)

copy_files_between_buckets(source_s3_client, dest_s3_client, source_bucket, dest_bucket, 'corephotos/')

if __name__ == "__main__":
    main()

Any thoughts would be greatly appreciated.

Accepted Answer

It's a permissions issue, but I think you already know that.

You've got the account with the source bucket (in Canada), and the account with the target bucket (in us-east-1).

Which account is your Python script being run by? This bit here `boto3.Session(profile_name=aws_profile, region_name=region_name)`

If these are the credentials of a user in the account which contains the source bucket, then the bucket policy of the target bucket in the target account needs to explicitly grant sufficient privileges to this user in the source account.

(or the other way around, if the credentials used in the script are in the account with the target bucket, then the source bucket policy needs to grant sufficient privileges)

If KMS keys are being used then it's the same story there, the key policy has to explicitly grant access to the user.

This link will really help you https://docs.aws.amazon.com/AmazonS3/latest/userguide/troubleshoot-403-errors.html

S3 actions accross regions

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