How to Secure an SSH Server in Ubuntu 14.04

How to Secure an SSH Server in Ubuntu 14.04

1. Note: this tutorial assumes that the SSH server is running Ubuntu 14.04, and the client machine is a Linux.
2. Change SSH listening port.
3. Only use Protocol 2.
4. Limit users access.
5. Disable root login.
6. Hide last login.
7. Restrict the interface to log in.
8. Disable password uthentication.

1. How do I setup a secure SSH server?
2. How do I give someone an SSH access in Ubuntu?
3. How do I enable and install SSH on Ubuntu?
4. How do I enable SSH on my firewall?
5. Is SSH a security risk?
6. What port should I use for SSH?
7. How do I enable SSH access?
8. How do I give someone access to my ssh?
9. How do I limit access to SSH?
10. How do I know if SSH is enabled Ubuntu?
11. How do I enable SSH on Linux server?
12. What is SSH in Ubuntu?

How do I setup a secure SSH server?

10 Steps to Secure Open SSH

1. Strong Usernames and Passwords. ...
2. Configure Idle Timeout Interval. ...
3. Disable Empty Passwords. ...
4. Limit Users' SSH Access. ...
5. Only Use SSH Protocol 2. ...
6. Allow Only Specific Clients. ...
7. Enable Two-Factor Authentication. ...
8. Use Public/Private Keys for Authentication.

How do I give someone an SSH access in Ubuntu?

Create a new SSH user on Ubuntu Server

1. Create a new user (let's call them jim for the rest of this). I want them to have a /home/ directory.
2. Give jim SSH access.
3. Allow jim to su to root but not perform sudo operations.
4. Turn off root SSH access.
5. Move SSHd off to a non-standard port to help stop brute-attacks.

How do I enable and install SSH on Ubuntu?

Enabling SSH on Ubuntu

1. Open your terminal either by using the Ctrl+Alt+T keyboard shortcut or by clicking on the terminal icon and install the openssh-server package by typing: sudo apt update sudo apt install openssh-server. ...
2. Once the installation is completed, the SSH service will start automatically.

How do I enable SSH on my firewall?

Configure the Windows Firewall

1. Click on Start --> Control Panel --> Windows Firewall --> Exceptions Tab.
2. Click the Add Port... button.
3. Name: SSH.
4. Port Number: 22.
5. TCP.
6. Click OK to add the SSH exception to the firewall.
7. Click OK to close the Windows Firewall screen.

Is SSH a security risk?

As I discussed before, SSH is a powerful security tool, protecting privileged access to mission critical systems. However, when it is not properly managed, it can become a security liability instead of asset.

What port should I use for SSH?

The default port for SSH client connections is 22; to change this default, enter a port number between 1024 and 32,767. The default port for Telnet client connections is 23; to change this default, enter a port number between 1024 and 32,767.

How do I enable SSH access?

Enable root login over SSH:

1. As root, edit the sshd_config file in /etc/ssh/sshd_config : nano /etc/ssh/sshd_config.
2. Add a line in the Authentication section of the file that says PermitRootLogin yes . ...
3. Save the updated /etc/ssh/sshd_config file.
4. Restart the SSH server: service sshd restart.

How do I give someone access to my ssh?

Allow SSH Access to a user or group

You should use Tab instead of Space-bar. Meaning - add the word "AllowUsers" and hit the Tab key and then specify the username. You can also specify more than one user as shown below. This setting will allow all the members of the "root" group to ssh to the Linux server.

How do I limit access to SSH?

Limit SSH User Logins

Open the /etc/ssh/sshd_config file. Add an AllowUsers line at the bottom of the file with a space separated by list of usernames. For example, user tecmint and sheena both have access to remote ssh. Now restart ssh service.

How do I know if SSH is enabled Ubuntu?

How to check if SSH is running on Linux?

1. First Check if the process sshd is running: ps aux | grep sshd. ...
2. Second, check if the process sshd is listening on port 22: netstat -plant | grep :22.

How do I enable SSH on Linux server?

Type sudo apt-get install openssh-server. Enable the ssh service by typing sudo systemctl enable ssh. Start the ssh service by typing sudo systemctl start ssh. Test it by login into the system using ssh user@server-name.

What is SSH in Ubuntu?

SSH ("Secure SHell") is a protocol for securely accessing one computer from another. ... The most popular Linux SSH client and Linux SSH server are maintained by the OpenSSH project. The OpenSSH client is included in Ubuntu by default. For information on connecting to an SSH server, see Connecting to an OpenSSH Server.