Spokesman SFTP

An SFTP Server which -when connected to- provides access to Amazon S3 buckets

Usage

Specify port Start as Java process

mvn clean package spring-boot:run

then connect

sftp -P 21000 -i key.pem localhost

Users & Access

Client Access to SFTP Server

Clients connect to Spokesman SFTP using their ssh key (testKey pass is hubio). At the moment, permitted keys are stored in authorized_keys. Spokesman will verify it's identity with the key in authorizedKeysFile (application.yml)

SFTP Access to S3

The username provided by the client to Spokesman is then used to limit which Amazon S3 bucket (defined as home in application.yml) is visible to that user (application.yml). As directories provided to SFTP users is managed here, Spokesman will connect to S3 as a single user. Amazon S3 access keys (s3fs_access_key & s3fs_secret_key) need to be specified in amazon.properties for this user in order for Spokesman to access S3. On S3, permissions need to be set so that any directory that will be usable by any SFTP user, for example:-

 users:
   exampleUsername:
     home: example_bucket

should be accessable to the S3 user linked to the provided keys, i.e.

{
   "Version": "2012-10-17",
   "Statement": [
       {
           "Effect": "Allow",
           "Action": "s3:*",
           "Resource": [
              "arn:aws:s3:::example_bucket/*",
              "arn:aws:s3:::example_bucket"
           ]
       },
       {
           "Effect": "Allow",
           "Action": "s3:ListAllMyBuckets",
           "Resource": "*"
       }
   ]
}