Digisol DG-GS4826S, Management Manual

Page: 309 / 1344

C
HAPTER
14 | Security Measures
Configuring the Secure Shell
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09574804776117
3. Import Client’s Public Key to the Switch – See "Importing User Public
Keys" on page 313 , or use the copy tftp public-key command
( page 659 ) 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 via the User Accounts
page as described on page 291 .) 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 Version 1 key:
1024 35
13410816856098939210409449201554253476316419218729589211431738
80055536161631051775940838686311092912322268285192543746031009
37187721199696317813662774141689851320491172048303392543241016
37997592371449011938006090253948408482717819437228840253311595
2134861022902978982721353267131629432532818915045306393916643
steve@192.168.1.19
4.
Set the Optional Parameters – On the SSH Settings page, configure the
optional parameters, including the authentication timeout, the number
of retries, and the server key size.
5. Enable SSH Service – On the SSH Settings page, 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.