C
HAPTER
24
| Authentication Commands
Secure Shell
– 840 –
93559423035774130980227370877945452408397175264635805817671670
9574804776117
3. Import Client’s Public Key to the Switch – Use the copy tftp public-key
command to copy a file containing the public key for all the SSH client’s
granted management access to the switch. (Note that these clients
must be configured locally on the switch with the username command.)
The clients are subsequently authenticated using these keys. The
current firmware only accepts public key files based on standard UNIX
format as shown in the following example for an RSA key:
1024 35
13410816856098939210409449201554253476316419218729589211431738
80055536161631051775940838686311092912322268285192543746031009
37187721199696317813662774141689851320491172048303392543241016
37997592371449011938006090253948408482717819437228840253311595
2134861022902978982721353267131629432532818915045306393916643
steve@192.168.1.19
4. Set the Optional Parameters – Set other optional parameters, including
the authentication timeout, the number of retries, and the server key
size.
5. Enable SSH Service – Use the ip ssh server command to enable the
SSH server on the switch.
6. Authentication – One of the following authentication methods is
employed:
Password Authentication (for SSH v1.5 or V2 Clients)
a. The client sends its password to the server.
b. The switch compares the client's password to those stored in
memory.
c. If a match is found, the connection is allowed.
N
OTE
:
To use SSH with only password authentication, the host public key
must still be given to the client, either during initial connection or manually
entered into the known host file. However, you do not need to configure
the client's keys.
Public Key Authentication – When an SSH client attempts to contact the
switch, the SSH server uses the host key pair to negotiate a session
key and encryption method. Only clients that have a private key
corresponding to the public keys stored on the switch can access it. The
following exchanges take place during this process:
Authenticating SSH v1.5 Clients
a. The client sends its RSA public key to the switch.
b. The switch compares the client's public key to those stored in
memory.
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