To configure white and black lists for SFTP connections, you can follow the steps below:
1. Determine the IP addresses or subnet ranges that you want to allow or block. This can be done by reviewing your network logs or consulting with your IT team.
1. Access the SFTP server’s configuration file. This is usually located in the /etc/ssh/sshd\_config file.
1. To allow specific IP addresses or subnet ranges, add the following line to the configuration file:
AllowUsers username@ipaddress/subnet\_mask
Replace “username@ipaddress/subnet\_mask” with the specific IP address or subnet that you want to allow.
1. To block specific IP addresses or subnet ranges, add the following line to the configuration file:
DenyUsers username@ipaddress/subnet\_mask
Replace “username@ipaddress/subnet\_mask” with the specific IP address or subnet that you want to block.
1. Save the configuration file and restart the SFTP server for the changes to take effect.
Note: Be cautious when implementing IP filters as it may inadvertently block legitimate users. Always test thoroughly before deploying the configuration changes to a production environment.
