Configuring a client's host public key
In publickey authentication, the server compares the SSH username and the client's host public key received from the client with the locally saved SSH username and the client's host public key. If they are the same, the server checks the digital signature that the client sends. The client generates the digital signature by using the private key that is paired with the client's host public key.
For publickey authentication, password-publickey authentication, or any authentication, you must perform the following tasks:
Configure the client's DSA, ECDSA, or RSA host public key on the server.
As a best practice, configure no more than 20 SSH client's host public keys on an SSH server.
Specify the associated host private key on the client to generate the digital signature.
If the device acts as an SSH client, specify the public key algorithm on the client. The algorithm determines the associated host private key for generating the digital signature.
You can enter the content of a client's host public key or import the client's host public key from the public key file. Import the client's host public key as a best practice.
Entering a client's host public key
Before you enter the client's host public key, you must use the display public-key local public command on the client to obtain the client's host public key.
To enter a client's host public key:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter public key view. | public-key peer keyname | N/A |
3. Configure a client's host public key. | Enter the content of the client's host public key | The host public key must be in the DER encoding format without being converted. When you enter the content of a client's host public key, you can use spaces and carriage returns between characters. When you save the host public key, spaces and carriage returns are removed automatically. For more information, see "Managing public keys." |
4. Return to system view. | peer-public-key end | N/A |
Importing a client's host public key from the public key file
Before you import the host public key, upload the client's public key file (in binary) to the server, for example, through FTP or TFTP. During the import process, the server automatically converts the host public key in the public key file to a string in PKCS format.
To import a client's host public key from the public key file:
Step | Command |
|---|---|
1. Enter system view. | system-view |
2. Import a client's public key from the public key file. | public-key peer keyname import sshkey filename |