createsftp.sh

#!/bin/bash

####
# This script automatically creates SFTP Account and allow only access to Home Directory
# Inspired by: # https://www.hostfav.com/blog/index.php/2017/09/08/script-to-create-a-sftp-user-to-access-only-home-directory-ubuntu-12x-14x-or-16x/
# Author: Luis Soto
#
# Date: 04/05/20
#
# Tested in Ubuntu 19.04
#
###

# Check user name supplied or not
if [ $# -lt 1 ]; then
        echo "Please supply a username"
        echo "Example: " $0 "john"
        exit
fi

# Check if username already exist
if id "$1" >/dev/null 2>&1; then
         echo "Username Exists"
          echo "Use different username"
           exit
   fi

   # Declare local variable and generate random password for SFTP
   newuser=$1
   sftpgroup="sftponly"
   randompw=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 8 | head -n 1)

   # Create new user and assign random password.
   useradd $newuser
   echo $newuser:$randompw | chpasswd

   #Check if sftpgroup users group exists or create it
   [ $(getent group $sftpgroup) ] || groupadd somegroupname
   if ! grep -q "^${sftpgroup}:" /etc/group
    then
       groupadd somegroupname
       cat <<EOF >> /etc/ssh/sshd_config
           Match group ${sftpgroup}
           ForceCommand internal-sftp
           PasswordAuthentication yes
           ChrootDirectory %h
            PermitTunnel no
            AllowAgentForwarding no
            AllowTcpForwarding no
           X11Forwarding no
EOF
    fi

# Add user to sftpgroup group
usermod -G $sftpgroup $newuser

# Setting folder permission
echo "Please wait Applying Permission and setting Incoming folder"

mkdir /home/$newuser
chown root:root /home/$newuser
sleep 2
mkdir /home/$newuser/sftproot
sleep 2
chown $newuser:$sftpgroup /home/$newuser/sftproot

#create
mkdir -p /var/www/$newuser
chown -R $newuser:$sftpgroup /var/www/$newuser
mkdir -p /home/$newuser/sftproot/public_html
mount --bind /home/$newuser/sftproot/public_html /var/www/$newuser

sleep 2
service ssh restart

# New Username and Password to account.txt

cat <<EOF >> /home/account.txt
$newuser $randompw
EOF

deletesftp.sh

#!/bin/bash

####
# This script DELETES AN automatically created SFTP ONLY user
#
###

# Check user name supplied or not
if [ $# -lt 1 ]; then
echo "Please supply a username"
echo "Example: " $0 "john"
exit
fi

# Check if username already exist
if id "$1" >/dev/null 2>&1; then
 echo "Username Exists"
 else
  echo "Username not exits"
  echo "check Username and try again"
  exit
fi

# Declare local variable for username to delete
deleteuser=$1

deluser $deleteuser
sudo rm -rf $deleteuser
umount /var/www/$newuser
sudo rm -rf /var/www/$deleteuser