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Asanté IntraCore 36000 Series
1. Generate a Host Key Pair – On the SSH Host Key Settings page, create a host public/private key pair.
2. Provide Host Public Key to Clients – Many SSH client programs automatically import the host public key
during the initial connection setup with the switch. Otherwise, you need to manually create a known
hosts file on the management station and place the host public key in it. An entry for a public key in the
known hosts file would appear similar to the following example:
10.1.0.54 1024 35 15684995401867669259333946775054617325313674890836547254
15020245593199868544358361651999923329781766065830956 10825913212890233
76546801726272571413428762941301196195566782 59566410486957427888146206
5194174677298486546861571773939016477935594230357741309802273708779454524083971
752646358058176716709574804776117
3. Import Client’s Public Key to the Switch – Use the copy tftp public-key command (section
15.2.1
) 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 in section
6.1 Configuring User Accounts
.) 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 1341081685609893921040944920155425347631641921872958921143173880
0555361616310517759408386863110929123222682851925437460310093718772119969631781
3662774141689851320491172048303392543241016379975923714490119380060902539484084
8271781943722884025331159521348610229029789827213532671316294325328189150453063
93916643 [email protected]
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. Challenge-Response 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. The following
exchanges take place during this process:
•
The client sends its public key to the switch.
•
The switch compares the client's public key to those stored in memory.
•
If a match is found, the switch uses the public key to encrypt a random sequence of bytes, and
sends this string to the client.
•
The client uses its private key to decrypt the bytes, and sends the decrypted bytes back to the
switch.
•
The switch compares the decrypted bytes to the original bytes it sent. If the two sets match, this
means that the client's private key corresponds to an authorized public key, and the client is
authenticated.
Note:
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. You do not need to configure the
client’s keys.
Note:
The SSH server supports up to four client sessions. The maximum number of client sessions includes
both current Telnet sessions and SSH sessions.
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