How to login to Ubuntu www-data with SSH

# work with root
sudo su -

# change www-data to login user
mkdir -p /home/www-data
chown www-data:www-data /home/www-data
chmod 755 /home/www-data
usermod -s /bin/bash www-data
passwd www-data
# set www-data password


su - www-data

# make ssh keys
cd .ssh
ssh-keygen -t rsa
chmod 600 ./*
chmod 744 ~/.ssh
# change the name if you need. depending on your ssh setting.
mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys

exit

vi /etc/ssh/sshd_config
---
# Add below line if you find other "AllowUsers" setting.
AllowUsers www-data
---

exit