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Introduction

Secure Shell (SSH) is an encrypted protocol used by Linux users to connect to their remote servers.

Generally, there are two ways for clients to access their servers – using password based authentication or public key based authentication.

Using SSH keys for authentication is highly recommended, as a safer alternative to passwords.

This tutorial will guide you through the steps on how to generate and set up SSH keys on CentOS 7. We also cover connecting to a remote server using the keys and disabling password authentication.

1. Check for Existing Keys

Prior to any installation, it is wise to check whether there are any existing keys on the client machines.

Open the terminal and list all public keys stored with the following command:

The output informs you about any generated keys currently on the system. If there aren’t any, the message tells you it cannot access /.ssh/id_*.pub , as there is no such file or directory.

2. Verify SSH is Installed

To check if thw package is installed, run the command:

If you already have SSH, the output tells you which version it is running. Currently, the latest version is OpenSSH 8.0/8.0p1.

Note: Refer to our guide If you need to install and enable SSH on your CentOS system.

Steps to Creating SSH keys on CentOS

1. Start by logging into the source machine (local server) and creating a 2048-bit RSA key pair using the command:

If you want to tighten up security measures, you can create a 4096-bit key by adding the -b 4096 flag:

2. After entering the command, you should see the following prompt:

3. To save the file in the suggested directory, press Enter. Alternatively, you can specify another location.

Note: If you already have a key pair in the proposed location, it is advisable to pick another directory. Otherwise it will overwrite existing SSH keys.

Anytime upgrade key generator for vista to windows 7 32 bit. 4. Next, the prompt will continue with:

Although creating a passphrase isn’t mandatory, it is highly advisable.

5. Finally, the output will end by specifying the following information:

Now you need to add the public key to the remote CentOS server.

You can copy the public SSH key on the remote server using several different methods:

1. using the ssh-copy-id script
2. using Secure Copy (scp)
3. manually copying the key

The fastest and easiest method is by utilizing ssh-copy-id. If the option is available, we recommend using it. Otherwise, try any of the other two noted.

1. Start by typing the following command, specifying the SSH user account, and the IP address of the remote host:

If it is the first time your local computer is accessing this specific remote server you will receive the following output:

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2. Confirm the connection – type yes and hit Enter.

3. Once it locates the id_rsa.pub key created on the local machine, it will ask you to provide the password for the remote account. Type in the password and hit Enter.

4. Once the connection has been established, it adds the public key on the remote server. This is done by copying the ~/.ssh/id_rsa.pub file to the remote server’s ~/.ssh directory. You can locate it under the name authorized_keys.

5. Lastly, the output tells you the number of keys added, along with clear instructions on what to do next:

1. First, set up an SSH connection with the remote user:

2. Next, create the ~/.ssh directory as well as the authorized_keys file:

3. Use the chmod command to change the file permission:

chmod 700 makes the file executable, while chmod 600 allows the user to read and write the file.

4. Now, open a new terminal session, on the local computer.

5. Copy the content from id_rsa.pub (the SSH public key) to the previously created authorized_keys file on the remote CentOS server by typing the command:

With this, the public key has been safely stored on the remote account.

1. To manually add the public SSH key to the remote machine, you first need to open the content from the ~/.ssh/id_rsa.pub file:

2. As in the image below, the key starts with ssh-rsa and ends with the username of the local computer and hostname of the remote machine:

3. Copy the content of the file, as you will need later.

4. Then, in the terminal window, connect to the remote server on which you wish to copy the public key. Use the following command to establish the connection:

5. Create a ~/.ssh directory and authorized_keys file on the CentOS server with the following command:

6. Change their file permission by typing:

7. Next, open the authorized_keys file with an editor of your preference. For example, to open it with Nano, type:

8. Add the public key, previously copied in step 2 of this section, in a new line in (under the existing content).

9. Save the changes and close the file.

10. Finally, log into the server to verify that everything is set up correctly.

Once you have completed the previous steps (creating an RSA Key Pair and copying the Public Key to the CentOS server), you will be able to connect to the remote host without typing the password for the remote account.

All you need to do is type in the following command:

If you didn’t specify a passphrase while creating the SSH key pair, you will automatically log in the remote server.

Otherwise, type in the passphrase you supplied in the initial steps and press Enter.

Once the shell confirms the key match, it will open a new session for direct communication with the server.

Although you managed to access the CentOS server without having to provide a password, it still has a password-based authentication system running on the machine. This makes it a potential target for brute force attacks.

You should disable password authentication entirely by following the outlined steps.

Note: Consider performing the following steps through a non-root account with sudo privileges, as an additional safety layer.

1. Using the SSH keys, log into the remote CentOS server which has administrative privileges:

2. Next, open the SSH daemon configuration file using a text editor of your choice:

3. Look for the following line in the file:

4. Edit the configuration by changing the yes value to no. Thus, the directive should be as following:

5. Save the file and exit the text editor.
6. To enable the changes, restart the sshdservice using the command:

7. Verify the SSH connection to the server is still functioning correctly. Open a new terminal window and type in the command:

In this article, you learned how to generate SSH key pairs and set up an SSH key-based authentication. We also covered copying keys to your remote CentOS server, and disabling SSH password authentication.

Next, You Should Read:

Finding your Private Key on Different Servers or Control Panels
Linux-Based (Apache, Nginx, LightHttpd)
Windows Operating Systems
Mac OS X
Tomcat
cPanel
WHM
Plesk
Synology NAS DSM
Webmin
VestaCP
DirectAdmin
Webuzo

What Is a Private Key?

What Is a Private Key?

You’ve received your SSL Certificate, and now you need to install it.

Firstly, let’s go through some basics. Public Key Infrastructure (PKI) security is about using two unique keys: the Public Key is encrypted within your SSL Certificate, while the Private Key is generated on your server and kept secret.

All the information sent from a browser to a website server is encrypted with the Public Key, and gets decrypted on the server side with the Private Key. Together the key pair keeps communication secured, and one key will not work without the other.

How do I get it?

The Private Key is generated with your Certificate Signing Request (CSR). The CSR is submitted to the Certificate Authority right after you activate your Certificate. The Private Key must be kept safe and secret on your server or device, because later you’ll need it for Certificate installation.

Note: all Certificates except Multi-Domains support Private Key generation in your browser. The key is always saved during SSL activation, we never receive this information. That’s why it’s important you save and back it up during the process if you use the in-browser automatic generation method. If the Private Key key file is lost, you’ll need to reissue your Certificate.

Can I generate a new Private Key for my Certificate if I lose the old one?

Yes. You can generate a new private key and CSR, or use the automatic CSR and key generation during Certificate reissue (this option is available for all Certificates except for the Multi-Domains).

What does the Private Key look like?

It looks like a block of encoded data, starting and ending with headers, such as —–BEGIN RSA PRIVATE KEY—– and —–END RSA PRIVATE KEY—–.

You may not get to see this code when generating your CSR. Usually, it gets generated in the background with the CSR, and is automatically saved on your server. The system also fills the corresponding field automatically during installation of your Certificate in some control panels, such as cPanel.

The way this works varies depending on your web server, control panel, or any other tools used for CSR generation. Select the one that applies to you in the following section for specific guidance.

Finding your Private Key on Different Servers or Control Panels

Linux-based (Apache, NGINX, LightHttpd)

Normally, the CSR/RSA Private Key pairs on Linux-based operating systems are generated using the OpenSSL cryptographic engine, and saved as files with “.key” or “.pem” extensions on the server.

But no specific extensions are mandatory for text files in Linux, so the key file may have any name and extension, or no extension at all.

If you remember the whole name of the key file or at least part of it, you can use the following command in your console to find the file and its directory:

The slash symbol in this command implies that the search begins from the root directory of the server. This way you have more file options to view. The name of the file in between the single quotation marks should be the part of the name that you remember. To search for the file by extension, enter “*.key” to view all the files with the “.key” extension on your server.

Tip: often the name of the file corresponds to the domain name it was generated for e.g. “domain_tld.key” or “domain.tld.pem”.

Here’s another useful command that lets you search files by their content:

This command will return the absolute path to the Private Key file if it’s located on your server.

Windows Operating Systems (IIS, Exchange, Small Business server)

Windows servers don’t let you view the Private Key in plain text format. When you import your Certificate via MMC or IIS, the Private Key is bound to it automatically if the CSR/Key pair has been generated on the same server.

If you need to obtain the Private Key to install your Certificate on a different server, you can export the key in a password protected PFX (PKCS#12) file. To do that, open the MMC Certificates snap-in tools following these steps:

Win+R >> mmc.exe >> OK >> File >> Add/Remove Snap-in >> Certificates >> Add >> Computer account >> Next >> Local computer >> Finish >> OK

Next, go to Certificate Enrollment Requests >> Certificates (if you haven’t completed the Certificate request yet). If you’ve done that, you’d select Personal >> Certificates, then right-click the Certificate >> select All Tasks >> Export. The Export wizard will open, and give you instructions. You can find more detailed instructions here.

Once that’s done, you will see the .pfx file containing your Certificate, CA-Bundle, and Private Key. To extract the key, use this tool. Choose the PKCS12 to PEM option, then upload the file and enter your chosen password.

Mac OS X

The Keychain tool in the Server application of Mac OS X won’t allow you to access the Private Key via the graphic user interface. Instead use the Terminal, by opening /etc/certificates/ directory and clicking the file.

Its name should be something like “*.key.pem”. And the terminal commands to open the file are: cd /etc/certificates/ , then ls , and sudo nano test.key.pem.

Note: to check if the Private Key matches your Certificate, go here. Then paste the Certificate and the Private Key text codes into the required fields and click Match.

Tomcat

If your Tomcat SSL connector is configured in JSSE style, the Private Key must be in a password-protected keystore file with a .jks or .keystore extension. This file, unlike most other cases, is created before the CSR. To extract the Private Key, you’ll need to convert the keystore into a PFX file with the following command:

Tips:

1. “Keystore.jks” should be replaced with your actual keystore name,
2. “keystore.p12” will be the name of the PKCS12 file you will receive,
3. <jkskeyalias>, <jkspassword> and <keypassword> are the alias (key and keystore passwords that were entered during keystore generation),
4. <jkskeyalias>, <jkspassword> and <keypassword> should be replaced with your JKS file alias, its password, and Private Key password.
5. <newp12password> and <newkeypassword> should be replaced with the passwords you set for your new PKCS12 file and the Private Key.

After the PKCS12 file is generated, you can convert it to a PEM file with separated CRT, CA-Bundle and KEY files using this tool. Alternatively, use the following command in the terminal:

“Private.key” can be replaced with any key file title you like.

cPanel

1. SSL/TLS Manager
   a) The simplest way to get the appropriate key used during SSL installation is reflected in the below picture:
   b) Alternatively, you can find the Private key in the Private keys section of the SSL/TLS Manager, which can be located in the cPanel main menu. You will see all the Private Keys ever generated in your cPanel. To view the code of the key, click View & Edit. If there are several keys in that menu, you can copy each of them to find a match with your Certificate code by using this tool.
2. File manager
   On the homepage of your cPanel, click File manager. Find the folder named “ssl” in the folder tree to the left (see screenshot). That folder will contain another folder named “keys”. This key folder also contains all the keys ever generated in your cPanel.
   

WHM

WHM stores your private keys and CSR codes in the SSL Storage Manager menu. On the homepage, click SSL/TLS >> SSL Storage Manager. To view the Private Key, click the magnifier icon next to the relevant key in the Key column.

Plesk

Click Domains >> your domain >> SSL/TLS Certificates. You’ll see a page like the one shown below. The key icon with the message “Private key part supplied” means there is a matching key on your server.

To get it in plain text format, click the name and scroll down the page until you see the key code. Alternatively, click the green arrow icon on the right. This will download a PEM file, containing your Private Key, Certificate and CA-Bundle files (if they were previously imported to the server). The files can be opened in any text editor, such as Notepad.

Synology NAS DSM

Windows Generate Rsa Key

When generating a CSR in Synology DSM, the Private Key is provided to you in a zip file on the last step. The key code is contained within a server.key file, that can be opened with a text editor, such as Notepad.

Webmin

Webmin works as a graphic user interface (GUI) on top of the command-line interface. There is also a file manager called Filemin, that you can use to browse the server file system and find your Private Key file. Alternatively, go to Others >> Command Shell and run the find or grep command, which you can find in the Linux Operating Systems section above.

VestaCP

How To Generate Rsa Key Windows

Your Private Key needs to be saved during CSR generation, as it will not be available via the graphic user interface.

That said, you may be able to retrieve your Private Key via SSH. It is saved as a temporary file in the “/tmp” folder. The path to the file will look something like this: “/tmp/tmp.npAnkmWFcu/domain.com.key”.

Note: the files in the /tmp directory are deleted every time your server is rebooted, so this is not a safe place to store your Private Key.

To get the path to your key file, use this Linux command:

Where you see “domain.com”, replace this with the actual domain name you generated the CSR for.

The path to your key file can also be found using the grep command:

DirectAdmin

In the up-to-date version of DirectAdmin, your Private Key is saved on the server. Access it in the “Paste a pre-generated Certificate and key” field during installation.

If that section is empty, it may mean the CSR and key were generated elsewhere, or the key was not saved in DirectAdmin due to a glitch. If a glitch happened, try retrieving the key via SSH. Usually it is saved in this directory:

/usr/local/directadmin/data/users/<user>/domains/<domain>.key

Note: <user> and <domain> are your DirectAdmin details.

Webuzo

Windows Generate Rsa Key Pair

On the homepage, find the SSL management section by clicking the Private Keys button. This will display a list of all the Private Keys generated in Webuzo. To see the key code, click the pencil icon to the right under the Option column, as shown in the screenshot below:

Create Rsa Key Windows

To sum up, ways to find your private key fully depend on the interface of the web server where you generate the CSR. If the methods described above did not help you find the private key for your certificate, the only solution would be to generate a new CSR/private key pair and reissue your certificate and to make sure that the key is saved on your server/local computer this time.