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To prevents brute force attacks against SSH, use the following software.

OpenSSH is recommended for remote login, making backups, remote file transfer via scp or sftp, and much more.

SSH is perfect to keep confidentiality and integrity for data exchanged between two networks and systems.

However, the main advantage is server authentication, through the use of public key cryptography.

From time to time there are rumors about OpenSSH zero day exploit.

This page shows how to secure your OpenSSH server running on a Linux or Unix-like system to improve sshd security.

It is recommended that you use public key based authentication.

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First, create the key pair using following ssh-keygen command on your local desktoplaptop.

Verify that ssh key based login working for you: ssh vivekrhel7-aws-server For more info on ssh public key auth see.

For example, allow vivek user to login as root using the sudo command.

Add user vivek to sudo group: sudo adduser vivek sudo Verify group membership with id command.

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Use the usermod command to add the user named vivek to the wheel group: sudo usermod -aG wheel vivek id vivek.

Sometimes you create UNIX Linux user account for FTP or email purpose.

They will have full access to system tools including compilers and scripting languages such as Perl, Python which can open network ports and do many other fancy things.

Only allow root, vivek and jerry user to use the system via SSH, add the following to sshdconfig: AllowUsers vivek jerry Alternatively, you can allow all users to login via SSH but deny only a few users, with the following line in sshdconfig: DenyUsers root saroj anjali foo You can also configure Linux PAM allows or deny login via the sshd server.

You can allow list of group name to access or deny access to the ssh.

Brute force attack works because user goes to dictionary based passwords.

You can force users to avoid passwords against a dictionary attack and use john the ripper tool to find out existing weak passwords.

Here is a sample random password generator (put in your.bashrc).

Usually, OpenSSH server must only accept connections from your LAN or other remote WAN sites only.

It is used for managing a Linux firewall and aims to provide an easy to use interface for the user.

Use the following command to accept port 22 from 202.54.1.529 only: sudo ufw allow from 202.54.1.529 to any port 22 Read Linux: 25 Iptables Netfilter Firewall Examples For New SysAdmins for more info.

Limit ssh port binding and change ssh port (many brutes forcing scripts only try to connect to TCP port 22).

To bind to 192.168.1.5 and 202.54.1.5 IPs and port 300, add or correct the following line in sshdconfig.

Just update your etchosts.allow file as follows to allow SSH only from 192.168.1.2 and 172.16.23.12 IP address.

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