Script for this guide https://wiki.sydit.se/teknik:guider:chrootad_sftp_med_pam_mysql_pa_rhel6

bootstrap_sftp.bash

#!/usr/bin/env bash

home_base=/var/sftp

test $(id -u $PAM_USER) -gt 500 || exit 1
grep ^{{chroot_openssh_group}} /etc/group | grep -q $PAM_USER || exit 1

_HOME=$(getent passwd $PAM_USER 2>/dev/null | cut -d: -f6 2>/dev/null)

if [ -z "$_HOME" ]; then
  _HOME="/home/$PAM_USER"
fi

test -d $_HOME || exit 1

if [ ! -d "$home_base/$PAM_USER" ]; then
  echo "Creating home $home_base/$PAM_USER"
  mkdir -p "$home_base/$PAM_USER"
fi

if [ ! -d "$home_base/$PAM_USER/ftp_home" ]; then
  echo "Creating ftp_home mount point for $PAM_USER"
  mkdir "$home_base/$PAM_USER/ftp_home"
fi

if ! mount | grep "$home_base/$PAM_USER/ftp_home type none (rw,bind)" &>/dev/null; then
  echo "Mounting ftp_home in users ($PAM_USER) sftp-dir "
  mount -B "$_HOME" "$home_base/$PAM_USER/ftp_home"
fi