What is aws sftp password for open ssh login

Question

I run

sftp -i privatekeyfile sftp_user@MY_ENDPOINT

and am asked for the password for my endpoint

sftp_user@MY_ENDPOINT's password: 

What password am I supposed to supply here ?

Others have mentioned using my ssh password but I am denied access with ""

I generated my key file with ssh-keygen -P "" keyname

For context, I want to setup an ftp server with access to S3 in order to share data with external customers.

Answer 1

There is no password for the user. The service is using your key to authenticate.

You need to make sure the role you are using has the trust relationship to transfer.amazonaws.com. It should look like:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": [
          "transfer.amazonaws.com"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}