Ssh Server Config

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  1. Ssh Server Config File
  2. Ssh Server Configuration Linux
  3. Ssh Server Config
  4. Free Ssh Server
  5. Ssh Server Config
  6. Ssh Config Settings

Configure how SSH runs on the server for better security.

We'll log into a server and edit the /etc/ssh/sshd_config file, to change how users can use SSH to log into the server from remote locations.We previously have used our local ~/.ssh/config file to easily log into a server. Let's now see some SSH options on the remote server, to see how we can affect who can log in and how.

Step 1: Create the SSH config file When you install SSH, you’ll have a /.ssh directory created automatically. This direct contains your public key, private key a. 5.5 After Inst alling Cygwin and Configuring SSH. After installing Cygwin (as described in Section 5.3) and configuring SSH (as described in Section 5.4), follow these steps: If the OMS host runs on a Microsoft Windows platform, perform the following on the OMS host: Right click My Computer, then select Properties.

SSH configuration is generally found in /etc/ssh/sshd_config.

Change SSH Port

We can change the port users use to login away from port 22.

Change the Port option to something other than 22:

Then restart SSH:

We can then try to login from our local computer by adjusting the port to use:

I usually keep port on standard port 22 and use other security means to lock this down.

Create New Admin User

We don't want user root to be able to login over SSH, as that user has no limits in privileges.

Creating a new user, who can use 'sudo', but isn't the root user, adds security:

  1. SSH key usually provides a first (separate) password needed, so attackers need both the SSH private key and knowledge of this password
  2. User then required to use their own password on top of that to run privileged commands via 'sudo'. This is missing when logged in as 'root' directly.
  3. We remove a vector of remote attack - root user cannot be logged into remotely

On the remote server, logged in as user root, we create a new user fideloper:

Then add user fideloper to group sudo, which allows that user to use 'sudo' commands:

Log in as user 'fideloper'

Next we want to make sure we can log into user 'fideloper'. To do so, we get our previously created id_sshex.pub (on our local computer) and paste it into the authorized_keys file of the new 'fideloper' user on the remote server.

Then, once again locally, edit the ~/.ssh/config file to adjust user from 'root' to 'fideloper':

Make it look like this:

Save that and then attempt to log into our server (again, from our local computer):

And we should get logged in as user 'fideloper'!

Disable SSH login of user root

Back on the remote server, let's edit the sshd_config file some more and lock down who can login and how further.

Disable the login of user root:

Save that and restart SSH:

Back on our local computer, try to login as root again: Osx node.

This will ask for a password but tell is permission is denied, even if using the right password.

Disable password authentication

On the remote server, edit sshd_config and turn off the ability to login over SSH using password:

Edit the 'PasswordAuthentication' directive:

Save that and restart SSH:

Locally, try to login as user 'root' again and see you get permission denied:

Allow SSH login by user or group

On the remote server, edit sshd_config and explicitly set which users can SSH into the server:

Add the 'AllowUsers' directive:

Save that and restart SSH:

Locally, log in as user 'fideloper' successfully:

Back on the remote server, let's use the 'AllowGroups' directive instead:

Add the 'AllowUsers' directive:

Save that and restart SSH:

Locally, add a new Terminal tab (DON'T LOG OUT OF YOUR CURRENT SESSION) and try to login again: Password protect zip file mac 2020.

You'll get denied, as none of our users are in group 'allowssh'.

On the remote server, create that group and assign it to user 'fideloper':

Locally, try to login again and see that you can login:

In the end, I allow both 'allowssh' and 'sudo' group to login over SSH: Upgrade os x el capitan to high sierra.

As always, save that and restart SSH:

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Applies to Windows Server 2019, Windows 10

OpenSSH is a connectivity tool for remote login that uses the SSH protocol. It encrypts all traffic between client and server to eliminate eavesdropping, connection hijacking, and other attacks.

OpenSSH can be used to connect Window 10 clients to Windows Server 2019. OpenSSH Client is available to install on Windows 10 build 1809 and later, while OpenSSH Server is available to install on Windows Server 2019 and later.

Important

If you downloaded OpenSSH from the GitHub repo at PowerShell/openssh-portable, follow the instructions listed there, not the ones in this article.

Install OpenSSH using Windows Settings

Both OpenSSH components can be installed using Windows Settings. OpenSSH Server is installed on Windows Server and OpenSSH Client is installed on Windows 10 devices.

To install the OpenSSH components:

  1. Open Settings, select Apps > Apps & Features, then select Optional Features.

  2. Scan the list to see if the OpenSSH is already installed. If not, at the top of the page, select Add a feature, then:

    • On Windows 10, find OpenSSH Client, then click Install
    • On Windows Server 2019, find OpenSSH Server, then click Install

Once setup completes, return to Apps > Apps & Features and Optional Features and you should see OpenSSH listed.

Note

Installing OpenSSH Server will create and enable a firewall rule named OpenSSH-Server-In-TCP. This allows inbound SSH traffic on port 22. If this rule is not enabled and this port is not open, connections will be refused or reset.

Install OpenSSH using PowerShell

Ssh Server Config File

To install OpenSSH using PowerShell, run PowerShell as an Administrator.To make sure that OpenSSH is available, run the following cmdlet:

This should return the following output:

Then, install the server or client components as needed:

Both of these should return the following output:

Start and configure SSH Server

To start and configure OpenSSH server for initial use, open PowerShell as an administrator, then run the following commands to start the SSHD service:

Connect to SSH Server

Once installed, you can connect to OpenSSH Server from a Windows 10 device with the SSH client installed using PowerShell as follows. Be sure to run PowerShell as an administrator:

Once connected, you get a message similar to the following:

Ssh server config file

Selecting yes adds that server to the list of known ssh hosts on your Windows client.

You are prompted for the password at this point. As a security precaution, your password will not be displayed as you type.

Ssh Server Configuration Linux

Once connected, you will see the Windows command shell prompt:

Ssh Server Config

Ssh server config ubuntu

Uninstall OpenSSH using Windows Settings

Free Ssh Server

To uninstall OpenSSH using Windows Settings:

Ssh Server Config

  1. Open Settings, then go to Apps > Apps & Features.
  2. Go to Optional Features.
  3. In the list, select OpenSSH Client or OpenSSH Server.
  4. Select Uninstall.

Uninstall OpenSSH using PowerShell

To uninstall the OpenSSH components using PowerShell, use the following commands:

Ssh Config Settings

You may need to restart Windows afterwards if the service was in use at the time it was uninstalled.