SFTP Server Set-Up

Synapse Integration tests require an SFTP server.  Here are the steps used to set up a tiny server for this purpose:

Initial Set-Up

The basic process is documented here:
http://kpdirection.com/technology/setting-up-sftp-on-ubuntu/

Some notes on how to follow this process:

Create an ubuntu t1.micro:
change ubuntu password
change root password
Edit /etc/ssh/sshd_config and set
PasswordAuthentication yes
per
http://www.natestiller.com/2012/03/enable-root-user-password-login-on-ec2-ubuntu/
also follow
http://kpdirection.com/technology/setting-up-sftp-on-ubuntu/
to enable sftp

These lines were added at the bottom of /etc/ssh/sshd_config:

Match Group sftpusers
  ChrootDirectory /sftp
  PasswordAuthentication yes
  ForceCommand internal-sftp

There's an extra trick here:
http://stackoverflow.com/questions/18220104/write-failed-broken-pipe-when-trying-to-login-through-ssh-with-a-specific-use

Adding a new user with a different sftp root:

Add a new unix group (unix command is 'groupadd')

Add this group and root dir to /etc/ssh/sshd_config  (Note that the "chroot directory has to be owned by root and can't be any group-write access", per http://stackoverflow.com/questions/18220104/write-failed-broken-pipe-when-trying-to-login-through-ssh-with-a-specific-use)

'service ssh restart'

Create a new unix user, set its password (unix commands are 'useradd' and 'passwd')

Add new user to the group (unix command is 'usermod')