SSH Proxy Encryption and Key Exchange Algorithms
SSH or secure shell provides a mechanism to establish a cryptographically secured connection between two parties, authenticating each side to the other, and passing commands and output back and forth. To secure the transmission of information, SSH employs a number of different types of data manipulation techniques at various points in the transaction.
System admins can configure the SSH Proxy to enable or disable key exchange and authentication algorithms used between the user and the SSH Proxy. To configure the SSH Proxy for available key exchange and authentication algorithms:
- Establish an SSH connection to the Kron PAM server
- Set the required parameters in /u01/nssoapp/conf/nsso.properties with the commands below. Multiple values can be used when separated with a comma “,”. cd /u01/nssoapp/conf/ vi nsso.properties
- Add/edit the following parameters with the vi editor.
All algorithms supported by SSH Proxy both on the server and client side are shown in the table below.
By default, only the algorithms considered secure soon have been enabled at the time of installation. Therefore, we recommend proceeding with caution when considering changes to the nsso.properties parameter.
Parameter | Avaible Values |
|---|---|
nsso.server.kex.algorithms | diffie-hellman-group1-sha1,diffie-hellman group14-sha1 |
nsso.server.host.key.algorithms | ssh-dss,ssh-dsa,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 |
nsso.server.encryption.algorithms | aes192-cbc,aes128-ctr,aes128-cbc,blowfish-cbc,3des-cbc,aes256-cbc,aes192-ctr,aes256-ctr |
nsso.server.mac.algorithms | hmac-md5-96,hmac-sha1,hmac-sha1-96,hmac-md5 |
nsso.client.kex.algorithms | diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,ecdh-sha2-nistp521,ecdh-sha2-nistp384,diffie-hellman-group-exchange-sha1 |
nsso.client.host.key.algorithms | ssh-dss,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 |
nsso.client.encryption.algorithms | aes192-cbc,aes128-ctr,aes128-cbc,blowfish-cbc,3des-cbc,aes256-cbc,aes192-ctr,aes256-ctr |
nsso.client.mac.algorithms | hmac-md5-96,hmac-sha1,hmac-sha1-96,hmac-md5,hmac-sha2-512,hmac-sha2-256 |