Ssh Cipher

Test suite for validating SSH cipher options

SSH Connection Specific Cipher

Description

Sets the SSH service to only accept a single cipher (AES256-CBC) and checks that a client can connect to the remote server using that cipher. Later on, checks that it cannot connect using a different cipher.

Scenario

Step 1: Set the following configuration in DUT0:

set interfaces ethernet eth0 address 10.215.168.20/24
set service ssh cipher aes256-cbc

Step 2: Set the following configuration in DUT1:

set interfaces ethernet eth0 address 10.215.168.21/24
set service ssh

Step 3: Init an SSH connection from DUT1 to IP address 10.215.168.20:

admin@DUT1$ ssh admin@10.215.168.20 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null cipher aes256-cbc
Show output
Warning: Permanently added '10.215.168.20' (ED25519) to the list of known hosts.
admin@10.215.168.20's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

Last login: Thu Nov 23 23:10:51 2023
admin@osdx$

Step 4: Init an SSH connection from DUT1 to IP address 10.215.168.20:

admin@DUT1$ ssh admin@10.215.168.20 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null cipher 3des-cbc

SSH Connection Multiple Ciphers

Description

Sets the SSH service to accept multiple ciphers (AES256-CBC and AES128-CTR) and checks that a client can connect to the remote server using any of the two ciphers.

Scenario

Step 1: Set the following configuration in DUT0:

set interfaces ethernet eth0 address 10.215.168.20/24
set service ssh cipher aes256-cbc,aes128-ctr

Step 2: Set the following configuration in DUT1:

set interfaces ethernet eth0 address 10.215.168.21/24
set service ssh

Step 3: Init an SSH connection from DUT1 to IP address 10.215.168.20:

admin@DUT1$ ssh admin@10.215.168.20 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null cipher aes256-cbc
Show output
Warning: Permanently added '10.215.168.20' (ED25519) to the list of known hosts.
admin@10.215.168.20's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

Last login: Thu Nov 23 23:11:04 2023 from 10.215.168.21
admin@osdx$

Step 4: Init an SSH connection from DUT1 to IP address 10.215.168.20:

admin@DUT1$ ssh admin@10.215.168.20 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null cipher aes128-ctr
Show output
Warning: Permanently added '10.215.168.20' (ED25519) to the list of known hosts.
admin@10.215.168.20's password:
Welcome to Teldat OSDx v3.8.1.7-beta3

This system includes free software.
Contact Teldat for licenses information and source code.

Last login: Thu Nov 23 23:11:32 2023 from 10.215.168.21
admin@osdx$

Step 5: Init an SSH connection from DUT1 to IP address 10.215.168.20:

admin@DUT1$ ssh admin@10.215.168.20 option StrictHostKeyChecking=no option UserKnownHostsFile=/dev/null cipher 3des-cbc