Script to create a user for SFTPonly / chrooted access for deploys via sftp

addSFTPonlyUser.sh

#!/bin/bash

# 
# The group 'sftponly' needs to exist
# $ groupadd sftponly
# Update ssh to allow new group and use chroot
# $ nano /etc/ssh/sshd_config
#
#	Match Group sftponly
#        ChrootDirectory %h
#        ForceCommand internal-sftp
#        AllowTcpForwarding no
#        X11Forwarding no
#

# check if the script is run as root
if [ "$(id -u)" -ne 0 ]; then
    echo "This script must be run as root. Use: sudo $0 USERNAME"
    exit 1
fi

# check for username parameter
if [ "$#" -ne 1 ]; then
    echo "Usage: sudo $0 USERNAME"
    exit 1
fi

USERNAME=$1
GROUP="sftponly"

echo "Enter password for $USERNAME:"
read -s PASSWORD
echo "Confirm password:"
read -s PASSWORD_CONFIRM

if [ "$PASSWORD" != "$PASSWORD_CONFIRM" ]; then
    echo "Passwords do not match. Exiting."
    exit 1
fi

# create user and home without shell access
useradd -g "$GROUP" -s /bin/false -m -d "/home/$USERNAME" "$USERNAME"

# set password
echo "$USERNAME:$PASSWORD" | chpasswd

# set correct permissions for chroot
chown root: "/home/$USERNAME"
chmod 755 "/home/$USERNAME"

# create child folder and set permissions
mkdir -p "/home/$USERNAME/public_html"
chmod 755 "/home/$USERNAME/public_html"
chown "$USERNAME:$GROUP" "/home/$USERNAME/public_html"

echo "User $USERNAME has been created and configured for SFTP-only access."