Ssh Key Generation And Distribution

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Generate keys automatically during deployment. If you use the Azure CLI to create your VM, you can optionally generate SSH public and private key files by running the az vm create command with the -generate-ssh-keys option. The keys are stored in the /.ssh directory. Apr 12, 2018 SSH-key-based authentication provides a more secure alternative to password-based authentication. In this tutorial we'll learn how to set up SSH-key-based authentication on a CentOS 7 installation. You can generate an SSH key pair directly in cPanel, or you can generate the keys yourself and just upload the public one in cPanel to use with your hosting account. When generating SSH keys yourself under Linux, you can use the ssh-keygen command.

To improve the system security even further, you can enforce key-based authentication by disabling the standard password authentication. To do so, open the /etc/ssh/sshdconfig configuration file in a text editor such as vi or nano, and change the PasswordAuthentication option as follows. SSH keys are always generated in pairs with one known as the private key and the other as the public key. The private key is known only to you and it should be safely guarded. By contrast, the public key can be shared freely with any SSH server to which you wish to connect. Jan 20, 2013 HPUX: Generation and Distribution of SSH KEY Machine1 (user1) wants to login Machine2 (user2) without password. To configure public-key authentication, follow these. If you don't find any existing SSH key, then you need to create a new SSH key. Generating New SSH Key. You can generate a new SSH key for authentication using the following command in Git Bash − $ ssh-keygen -t rsa -C 'youremail@mail.com' If you already have a SSH key, then don't a generate new key, as they will be overwritten.

[Contents] [Index]

About This Document >>
Installing SSH Tectia Server for IBM z/OS >>
Getting Started with SSH Tectia Server for IBM z/OS >>
Configuring the Server >>
Configuring the Client >>
Authentication >>
Using the z/OS System Authorization Facility
Server Authentication with Public Keys in File >>
Server Authentication with Certificates >>
User Authentication with Passwords
User Authentication with Public Keys in File >>
User Authentication with Certificates >>
Host-Based User Authentication >>
User Authentication with Keyboard-Interactive >>
Distributing Public Keys Using the Key Distribution Tool
Distributing Mainframe Server Keys
Distributing Remote Server Keys
Distributing Mainframe User Keys
Distributing Remote User Keys
Transferring Files >>
Tunneling >>
Troubleshooting SSH Tectia Server for IBM z/OS >>
Advanced Information >>
Man Pages >>
Log Messages >>

Distributing Public Keys Using the Key Distribution Tool

File transfer processing on mainframes is usually non-interactive. This means that the host keys of the remote servers must be stored in a way that user interaction is not needed during the batch process, and that both users and processes use non-interactive authentication methods for user authentication.

The key distribution tool, /usr/lpp/ssh2/bin/ssh-keydist2, can be used for storing multiple remote host keys to a common key store and setting up public-key authentication to multiple hosts.

The tool uses a sub-script /usr/lpp/ssh2/bin/ssh-1st-connect2 for receiving remote host keys.

The syntax of ssh-keydist2 is as follows: 

Usage: ssh-keydist2 [options] host [[options] [host]] ..Options:-u, --remote-user remote_user The default is the local username.-W, --ssh2-windows The remote host is running Windows and its Secure Shell server is SSH Tectia.-S, --ssh2-unix The remote host is running Unix and its Secure Shell server is SSH Tectia.-O, --openssh-unix The remote host is running Unix and its Secure Shell server is OpenSSH.-Z, --ssh2-zos The remote host is running z/OS and its Secure Shell server is SSH Tectia.-H, --hostlist-file hostlist_file File contains hostnames or username/hostname pairs.-p, --password-file pass_file File or dataset containing the password for authenticating to remote server(s) during public key setup. Use with care!-P, --empty-passphrase Generate the key pair with an empty passphrase.-d, --allow-keygen-overwrite Allow ssh-keygen2 to overwrite an existing key pair.-t, --key-type dsa rsa Type of the generated key-b, --key-bits bits Length of the generated key-f, --pubkey-file public_key_file Disable key pair generation, distribute this key instead.-a, --accept-new-host-keys Automatically accept new hostkeys. Use with care!-N, --only-accept-new-host-keys Only accept the hostkeys. Do not generate or distribute user keys.-A, --accepted-host-key-log log_file Log file of accepted new hostkeys-n, --do-not-execute Print the commands but do not execute them.-v, --verbose Use verbose mode.

Caution: When ssh-keydist2 is run with the -a or -N options, it accepts the received host keys automatically without prompting the user. You should verify the validity of keys after receiving them or you risk being subject to a man-in-the-middle attack. To be able to verify the keys, you should use the plain host key storage format. See Section Authenticating Remote Server Hosts for more information.

Most of the examples in this section are executed from Unix shell (for example, OMVS shell), but the same commands can also be run in JCL using BPXBATCH.

Distributing Mainframe Server Keys

Distributing Remote Server Keys

Distributing Mainframe User Keys

Distributing Remote User Keys

[Contents] [Index]

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Ssh Key Generation And Distribution Code

Several tools exist to generate SSH public/private key pairs. The following sections show how to generate an SSH key pair on UNIX, UNIX-like and Windows platforms.

Generating an SSH Key Pair on UNIX and UNIX-Like Platforms Using the ssh-keygen Utility

UNIX and UNIX-like platforms (including Solaris and Linux) include the ssh-keygen utility to generate SSH key pairs.

Create New Ssh Key

To generate an SSH key pair on UNIX and UNIX-like platforms using the ssh-keygen utility:
  1. Navigate to your home directory:
  2. Run the ssh-keygen utility, providing as filename your choice of file name for the private key:

    The ssh-keygen utility prompts you for a passphrase for the private key.

  3. Enter a passphrase for the private key, or press Enter to create a private key without a passphrase:

    Note:

    While a passphrase is not required, you should specify one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.

    The ssh-keygen utility prompts you to enter the passphrase again. /windows-7-64-bit-genuine-key-generator.html.

  4. Enter the passphrase again, or press Enter again to continue creating a private key without a passphrase:
  5. The ssh-keygen utility displays a message indicating that the private key has been saved as filename and the public key has been saved as filename.pub. It also displays information about the key fingerprint and randomart image.

Get Ssh Key

Generating an SSH Key Pair on Windows Using the PuTTYgen Program

Ssh Key Generation And Distribution System

The PuTTYgen program is part of PuTTY, an open source networking client for the Windows platform.

To generate an SSH key pair on Windows using the PuTTYgen program:

Ssh Key Generation Aix

  1. Download and install PuTTY or PuTTYgen.

    To download PuTTY or PuTTYgen, go to http://www.putty.org/ and click the You can download PuTTY here link.

  2. Run the PuTTYgen program.
  3. Set the Type of key to generate option to SSH-2 RSA.
  4. In the Number of bits in a generated key box, enter 2048.
  5. Click Generate to generate a public/private key pair.

    As the key is being generated, move the mouse around the blank area as directed.

  6. (Optional) Enter a passphrase for the private key in the Key passphrase box and reenter it in the Confirm passphrase box.

    Note:

    While a passphrase is not required, you should specify one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.

  7. Click Save private key to save the private key to a file. To adhere to file-naming conventions, you should give the private key file an extension of .ppk (PuTTY private key).

    Note:

    The .ppk file extension indicates that the private key is in PuTTY's proprietary format. You must use a key of this format when using PuTTY as your SSH client. It cannot be used with other SSH client tools. Refer to the PuTTY documentation to convert a private key in this format to a different format.
  8. Select all of the characters in the Public key for pasting into OpenSSH authorized_keys file box.

    Make sure you select all the characters, not just the ones you can see in the narrow window. If a scroll bar is next to the characters, you aren't seeing all the characters.

  9. Right-click somewhere in the selected text and select Copy from the menu.
  10. Open a text editor and paste the characters, just as you copied them. Start at the first character in the text editor, and do not insert any line breaks.
  11. Save the text file in the same folder where you saved the private key, using the .pub extension to indicate that the file contains a public key.
  12. If you or others are going to use an SSH client that requires the OpenSSH format for private keys (such as the ssh utility on Linux), export the private key:
    1. On the Conversions menu, choose Export OpenSSH key.
    2. Save the private key in OpenSSH format in the same folder where you saved the private key in .ppk format, using an extension such as .openssh to indicate the file's content.