Configuring SSH Access

Secure Shell, or SSH, is a network protocol that allows data to be exchanged over a secure channel between two systems. This section describes how to use JCS commands to configure SSH access to the JCS 1200 platform.

Tasks to configure SSH include:

• Generating the Host Key
• Adding the User Public Key

Generating the Host Key

SSH access requires a host key and a user public key.

To generate the host key:

1. Use an existing username and password to connect to the JCS management module serial port. For example:
   tcsh-1:telnet bcgmm1-con

   In this example, the serial port is connected to a telnet server port identified as bcgmm1-con.

2. Use the env command to specify mm[1] as the configuration target. For example:
   system> env —T mm[1]
3. Use the sshcfg command to generate a host key. For example:
   system:mm[1]> sshcfg —hk gen

   It takes about 1 minute to generate a host key.

4. You can use the displaylog command to monitor host key generation. For example:
   system:mm[1]> displaylog —f
5. Once the host key is generated, use the sshcfg command to enable SSH for the JCS CLI. For example:
   system:mm[1]> sshcfg —cstatus enabled

Adding the User Public Key

To generate a user public key:

1. See the “Generating the Host Key” section to generate a host key.
2. Locate the /.ssh/authorized_keys file and copy your public key from this file.
3. Use the users command to add your public key.

   You copy the public key from the authorized_keys file and paste it on the command line. For example:

   
   system:mm[1]> users —2 —pk —1 —add paste-key-here
4. Issue the users command to verify that the public key has been installed. For example:
   system:mm[1]> users —2

   - n chang
   - a Role:supervisor
   	...
   Number of SSH public keys installed for this user: 1
   Last login: 1/28/08 09:26:59

5. Log out, and then use SSH to log back in. For example:
   system:mm[1]> exit
tcsh-1 ssh bcgmm1

   In this example, the JCS management module Ethernet port is identified as bcgmm1.

Related Topics

• displaylog
• env
• sshcfg
• users