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Operation Manual – SSH Terminal Service

H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1

SSH Terminal Service

1-3

Through the above steps, the server and the client get the same session key, which is

to be used to encrypt and decrypt data exchanged between the server and the client

later. The server and the client use session ID in the authentication stage.

3) Authentication negotiation stage:

z The client sends its username information to the server.

z The server starts to authenticate the user. If the user is configured as having no

authentication on the server, the following step is skipped and the session request

stage starts directly.

z The server authenticates the user in some way (see the following note), till the

authentication succeeds or the connection is terminated due to authentication

timeout.

 Note:

SSH provides two kinds of authentication: password authentication and RSA

authentication.

(1) Password authentication works as follows:

z The client sends the username and password to the server.

z The server compares the received username and password against those

configured locally. The user passes the authentication if the server finds a match for

both username and password.

(2) RSA authentication works as follows:

z Configure the RSA public key of the client at the server.

z The client sends the member module of its RSA public key to the server.

z The server checks the validity of the member module. If it is valid, the server

generates a random number, which is sent to the client after being encrypted with

RSA public key of the client.

z Both the server and the client calculate authentication data by using the random

number and session ID.

z The client sends the authentication data it calculates to the server.

z The server compares the received authentication data with the authentication data

on itself. If they are identical, the authentication succeeds.

4) Session request stage. The client sends a session request to the server, which

processes the request and establish a session.

5) Interactive session stage. Both ends exchange data till the session ends.

1.1.2 SSH Server Configuration

The following table describes SSH Server configuration tasks.

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