sftp-chroot

#!/bin/sh
USER="sftp"

mkdir -p /mnt/data/share
chown root:root /mnt/data/share
chmod 755 /mnt/data/share

mkdir -p /srv/ssh/jail
mount -o bind /mnt/data/share /srv/ssh/jail

echo "Add the following to your /etc/fstab :"
echo "/mnt/data/share /srv/ssh/jail  none   bind   0   0"

useradd -s /usr/bin/nologin -d /srv/ssh/jail $USER
passwd $USER

mkdir /etc/ssh/authorized_keys
chown root:root /etc/ssh/authorized_keys
chmod 755 /etc/ssh/authorized_keys
chmod 644 /etc/ssh/authorized_keys/*

mkdir /srv/ssh/jail/$USER
chown $USER:$USER /srv/ssh/jail/$USER
chmod 755 /srv/ssh/jail/$USER