Title: Setup FTP server in Linux file sharing.

# ======Setup FTP in Linux======
# UPDATE and install ftp
sudo apt update;sudo apt upgrade
sudo apt install vsftpd
sudo service vsftpd status

# Go to the end of the file and add two lines
sudo nano /etc/vsftpd.conf
user_sub_token=$USER
local_root=/home/$USER/ftp
pasv_min_port=10000
pasv_max_port=10100
userlist_enable=NO
userlist_file=/etc/vsftpd.userlist
userlist_deny=NO
allow_anon_ssl=NO
force_local_data_ssl=NO
force_local_logins_ssl=NO


# Configure the firewall
sudo ufw allow from any to any port 20,21,10000:10100 proto tcp

# Add user will have access to FTP
sudo adduser efx

# Create a folder in home (ftp)
sudo mkdir /home/efx/ftp

# Change owner to public
sudo chown nobody:nogroup /home/efx/ftp

# Remove the right permission
sudo chmod a-w /home/efx/ftp

# Create an upload directory
sudo mkdir /home/efx/ftp/upload

# Change owner to non-user
sudo chown demo:demo /home/efx/ftp/upload/

# Create a demo file in the upload directory
echo hi >/home/efx/ftp/upload/saved.txt

# Add the user to FTP to log in and access the FTP server
$ echo "demo" |sudo tee -a /etc/vsftpd.userlist

# Restart the FTP server to apply the changes
$ sudo systemctl restart vsftpd

# Create a certificate to secure the FTP connection 
sudo openssl req -x509 -nodes -days 3650 -newkey rsa:2048 -keyout /etc/ssl/private/vsftpd.pem -out /etc/ssl/private/vsftpd.pem

# Edit ftp config file once again and change the certificate location to
sudo nano /etc/vsftpd.conf
rsa_cert_file=/etc/ssl/private/vsftpd.pem
rsa_private_key_file=/etc/ssl/private/vsftpd.pem
ssl_enable=YES

# Restart server
sudo systemctl restart vsftpd

# ======FTP commands to use in Linux======
# Connect ftp
ftp 192.168.1.5
enter user
enter password

# Download file (DBs, zip)
get <filename>

# Upload file (shell)
put <filename>

# Exit
bye

# more ftp client commands
cd - change remote working directory
lcd - change local working directory
get - recieve file
mget - get multiple files
passive - enter passive transfer mode
ls - list contents of remote directory

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