Ssh server

(SSH) server sends its own certificate to the SSH client for verification. This server certificate is associated with the trustpoint configured in the server certificate profile (ssh-server-cert-profile-server configuration mode). For user authentication, the SSH client sends the user's certificate to the SSH server for verification. The SSH server validates the incoming user certificate using public key infrastructure (PKI) trustpoints configured in the server certificate profile (ssh-server-cert-profile-user configuration mode). By default, certificate-based authentication is enabled for server and user at the SSH server end. How to Configure X.509v3 Certificates for SSH Authentication The following section provides information about how to configure X.509v3 Certificates for SSH Authentication. Configuring the SSH Server to Use Digital Certificates for Server Authentication To configure the SSH server to use digital certificates for server authentication, perform this procedure: Procedure Command or Action Purpose Step 1 enable Example: Device> enable Enables privileged EXEC mode. Enter your password, if prompted. Step 2 configure terminal Example: Device# configure terminal Enters global configuration mode. Step 3 ip ssh server algorithm hostkey {x509v3-ssh-rsa [ssh-rsa] | ssh-rsa [x509v3-ssh-rsa]} Example: Device(config)# ip ssh server algorithm hostkey x509v3-ssh-rsa Defines the order of host key algorithms. Only the configured algorithm is negotiated with the secure shell (SSH) client. Note The IOS SSH server must have at least one configured host key algorithm: ssh-rsa: public key based authentication x509v3-ssh-rsa: certificate-based authentication Step 4 ip ssh server certificate profile Example: Device(config)# ip ssh server certificate profile Configures server certificate profile and user certificate profile and enters SSH certificate profile configuration mode. Step 5 server Example: Device(ssh-server-cert-profile)# server Configures server certificate profile and enters SSH server certificate profile server configuration mode. Step 6 trustpoint sign PKI-trustpoint-name Example: Device(ssh-server-cert-profile-server)# trustpoint sign trust1 Attaches the public key infrastructure (PKI) trustpoint to the server certificate profile. The SSH server uses the certificate associated with this PKI trustpoint for server authentication. Step 7 ocsp-response include Example: Device(ssh-server-cert-profile-server)# ocsp-response include (Optional) Sends the Online Certificate Status Protocol (OCSP) response or OCSP stapling along with the server certificate. Note By default the no form of this command is configured and no OCSP response is sent

Along with the server certificate. Step 8 end Example: Device(ssh-server-cert-profile-server)# end Exits SSH server certificate profile server configuration mode and returns to privileged EXEC mode. Configuring the SSH Server to Verify Digital Certificates for User Authentication To configure the SSH Server to use digital certificates for user authentication, perform this procedure: Procedure Command or Action Purpose Step 1 enable Example: Device> enable Enables privileged EXEC mode. Enter your password, if prompted. Step 2 configure terminal Example: Device# configure terminal Enters global configuration mode. Step 3 ip ssh server algorithm authentication {publickey | keyboard | password} Example: Device(config)# ip ssh server algorithm authentication publickey Defines the order of user authentication algorithms. Only the configured algorithm is negotiated with the secure shell (SSH) client. Note The SSH server must have at least one configured user authentication algorithm. To use the certificate method for user authentication, the publickey keyword must be configured. The ip ssh server algorithm authentication command replaces the ip ssh server authenticate user command. Step 4 ip ssh server algorithm publickey {x509v3-ssh-rsa [ssh-rsa] | ssh-rsa [x509v3-ssh-rsa]} Example: Device(config)# ip ssh server algorithm publickey x509v3-ssh-rsa Defines the order of public key algorithms. Only the configured algorithm is accepted by the SSH client for user authentication. Note The SSH client must have at least one configured public key algorithm: ssh-rsa: public-key-based authentication x509v3-ssh-rsa: certificate-based authentication Step 5 ip ssh server certificate profile Example: Device(config)# ip ssh server certificate profile Configures server certificate profile and user certificate profile and enters SSH certificate profile configuration mode. Step 6 user Example: Device(ssh-server-cert-profile)# user Configures user certificate profile and enters SSH server certificate profile user configuration mode. Step 7 trustpoint verify PKI-trustpoint-name Example: Device(ssh-server-cert-profile-user)# trustpoint verify trust2 Configures the public key infrastructure (PKI) trustpoint that is used to verify the incoming user certificate. Note Configure multiple trustpoints by executing the same command multiple times. A maximum of 10 trustpoints can be configured. Step 8 ocsp-response required Example: Device(ssh-server-cert-profile-user)# ocsp-response required (Optional) Mandates the presence of the Online Certificate Status Protocol (OCSP) response with the incoming user certificate. Note By default the no form of this command

Is enabled. Step 3 switch(config)# exit Exits global configuration mode. Step 4 (Optional) switch# show ssh server (Optional) Displays the SSH server configuration. Step 5 (Optional) switch# copy running-config startup-config (Optional) Copies the running configuration to the startup configuration. Deleting SSH Server Keys You can delete SSH server keys after you disable the SSH server. Note To reenable SSH, you must first generate an SSH server key. Procedure Command or Action Purpose Step 1 switch# configure terminal Enters global configuration mode. Step 2 switch(config)# no feature ssh Disables the SSH server. Step 3 switch(config)# no ssh key [dsa | rsa] Deletes the SSH server key. The default is to delete all the SSH keys. Step 4 switch(config)# exit Exits global configuration mode. Step 5 (Optional) switch# show ssh key (Optional) Displays the SSH server configuration. Step 6 (Optional) switch# copy running-config startup-config (Optional) Copies the running configuration to the startup configuration. Clearing SSH Sessions You can clear SSH sessions from the Cisco Nexus device. Procedure Command or Action Purpose Step 1 switch# show users Displays user session information. Step 2 switch# clear line vty-line Clears a user SSH session. Configuration Examples for SSH The following example shows how to configure SSH: Procedure Step 1 Generate an SSH server key. switch(config)# ssh key rsa generating rsa key(1024 bits)..... . generated rsa key Step 2 Enable the SSH server. switch# configure terminal switch(config)# feature ssh Note This step should not be required because the SSH server is enabled by default. Step 3

Is more secure because it uses cryptographic keys instead of passwords.Connection Layer: This part allows multiple operations to happen simultaneously over a single SSH connection. This means you can run commands, transfer files, and perform other tasks at the same time without needing to open multiple connections.What is SSH Server and Client?We already explained what is SSH server, so let’s see what SSH client means. The SSH protocol works on a client-server model, where the SSH client and SSH server work together to create a secure connection.The SSH server is the part that waits for connections from SSH clients. It checks the identity of clients, sets up secure sessions, and allows access to system resources and services. The SSH server can work on different operating systems like Unix, Linux, macOS, and Windows, often using software such as OpenSSH. But what is SSH client and server?The SSH client is the program used to start the connection to the SSH server. Users use the client to choose the server they want to connect to and provide authentication details. Once connected, the client provides a secure way to run commands, transfer files, or use other network services over the encrypted connection. Popular SSH clients include OpenSSH for Unix-based systems and PuTTY for Windows.If you’ve learned what is SSH server and you like to know about the difference between RDP and SSH, check our guide on this topic.What is SSH Server Host Key?The SSH server host key is a cryptographic key pair used by the server to authenticate itself to clients. The host key ensures that the client is connecting to the legitimate server and not an imposter. Here’s a simple explanation for what is SSH key:Server Identification: When a client connects to an SSH server for the first time, the server presents its

SSH Server\InstalledBssVersions.ps1" 2025-02-09 21:29:40,724 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BvLsaEx.dll" 2025-02-09 21:29:40,724 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCtrl.exe" 2025-02-09 21:29:40,739 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCtrl.ps1" 2025-02-09 21:29:40,739 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\execs.exe" 2025-02-09 21:29:40,756 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsServer.exe" 2025-02-09 21:29:40,771 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\toterms.exe" 2025-02-09 21:29:40,771 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\totermh32.dll" 2025-02-09 21:29:40,788 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\totermh64.dll" 2025-02-09 21:29:40,788 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDll.h" 2025-02-09 21:29:40,802 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDll32.dll" 2025-02-09 21:29:40,802 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDll32.lib" 2025-02-09 21:29:40,802 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDll64.dll" 2025-02-09 21:29:40,818 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDll64.lib" 2025-02-09 21:29:40,833 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDllSample.exe" 2025-02-09 21:29:40,833 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\SfsDllSample.cpp" 2025-02-09 21:29:40,833 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCfg.exe" 2025-02-09 21:29:40,850 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCfgManip.exe" 2025-02-09 21:29:40,850 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCfgManip.idl" 2025-02-09 21:29:40,864 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\VirtAccountImporter.ps1" 2025-02-09 21:29:40,864 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\VirtAccountExporter.ps1" 2025-02-09 21:29:40,881 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCfgManip.htm" 2025-02-09 21:29:40,881 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\bvPwd.exe" 2025-02-09 21:29:40,897 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH

Server\bvRun.exe" 2025-02-09 21:29:40,912 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssCtrlLauncher.exe" 2025-02-09 21:29:40,912 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssStat.exe" 2025-02-09 21:29:40,928 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BssStat.cpp" 2025-02-09 21:29:40,928 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TelnetForward.exe" 2025-02-09 21:29:40,944 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\AgentForward.exe" 2025-02-09 21:29:40,944 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BvShell.exe" 2025-02-09 21:29:40,958 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\BvUpdateLauncher.exe" 2025-02-09 21:29:40,958 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\ansi" 2025-02-09 21:29:40,974 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\cygwin" 2025-02-09 21:29:40,974 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\linux" 2025-02-09 21:29:40,974 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\scoansi" 2025-02-09 21:29:40,989 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\screen" 2025-02-09 21:29:40,989 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\vt100" 2025-02-09 21:29:41,006 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\vt102" 2025-02-09 21:29:41,006 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\vt220" 2025-02-09 21:29:41,019 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\vt320" 2025-02-09 21:29:41,019 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\wyse50" 2025-02-09 21:29:41,019 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\wyse60" 2025-02-09 21:29:41,036 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\xterm" 2025-02-09 21:29:41,036 5800 [INFO ] - VERBOSE: Extracting file "C:\Program Files\Bitvise SSH Server\TermInfo\xterm-16color" 2025-02-09 21:29:41,051 5800 [INFO ] - VERBOSE: Installing file "C:\Program Files\Bitvise SSH Server\totermh.dir" 2025-02-09 21:29:41,051 5800 [INFO ] - VERBOSE: Creating directory "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Bitvise SSH Server" 2025-02-09 21:29:41,051 5800 [INFO ] - VERBOSE: Creating shortcut "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Bitvise SSH Server\Bitvise