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Configuring Secure Shell The Secure Shell (SSH) feature is an application and a protocol that provides a secure replacement to the Berkeley r-tools. The protocol secures sessions using standard cryptographic mechanisms, and the application can be used similarly to the Berkeley rexec and rsh tools. Two versions of SSH are available: SSH Version 1 and SSH Version 2. Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. For information about SSH Version 2, see the “ Secure Shell Version 2 Support” feature module. Prerequisites for Configuring Secure Shell Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. For SSH to work, the switch needs an Rivest, Shamir, and Adleman (RSA) public/private key pair. This is the same with Secure Copy Protocol (SCP), which relies on SSH for its secure transport. Download the required image on the device. The Secure Shell (SSH) server requires an IPsec (Data Encryption Standard [DES] or 3DES) encryption software image; the SSH client requires an IPsec (DES or 3DES) encryption software image.) Configure a hostname and host domain for your device by using the hostname and ip domain name commands in global configuration mode. Generate a Rivest, Shamir, and Adleman (RSA) key pair for your device. This key pair automatically enables SSH and remote authentication when the crypto key generate rsa command is entered in global configuration mode. Note To delete the RSA key pair, use the crypto key zeroize rsa global configuration command. Once you delete the RSA key pair, you automatically disable the SSH server. Configure user authentication for local or remote access. You can configure authentication with or without authentication, authorization, and accounting (AAA). The Secure Shell (SSH) server requires an IPsec (Data Encryption Standard [DES] or 3DES) encryption software image; the SSH client requires an IPsec (DES or 3DES) encryption software image.) Restrictions for Configuring Secure Shell Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. The Secure Shell (SSH) server and SSH client are supported on Data Encryption Standard (DES) (56-bit) and 3DES (168-bit) data encryption software images only. In DES software images, DES is the only encryption algorithm available. In 3DES software images, both DES and 3DES encryption algorithms are available. Execution shell is the only application supported. The login banner is not supported in Secure Shell Version 1. It is supported in Secure Shell Version 2. The SFTP server is not supported. Information About Configuring Secure Shell Secure Shell (SSH) is a protocol that provides a secure, remote connection to a device. SSH provides more security for remote connections than Telnet does by providing strong encryption when a device is authenticated. This software release supports SSH Version 2 (SSHv2). SSH Server Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. The Secure Shell (SSH) Server feature enables an SSH client to make a secure, encrypted connection to a Cisco device. This connection provides functionality that is similar to that of an inbound Telnet connection. Before SSH, security was

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Secure Shell Version 2 Support The Secure Shell Version 2 Support feature allows you to configure Secure Shell (SSH) Version 2. (SSH Version 1 support was implemented in an earlier Cisco software release.) SSH runs on top of a reliable transport layer and provides strong authentication and encryption capabilities. The only reliable transport that is defined for SSH is TCP. SSH provides a means to securely access and securely execute commands on another computer over a network. The Secure Copy Protocol (SCP) feature that is provided with SSH allows for the secure transfer of files. Prerequisites for Secure Shell Version 2 Support Before configuring SSH, ensure that the required image is loaded on your device. The SSH server requires you to have a k9 (Triple Data Encryption Standard [3DES]) software image depending on your release. You have to use a SSH remote device that supports SSH Version 2 and connect to a Cisco device. SCP relies on authentication, authorization, and accounting (AAA) to function correctly. Therefore, AAA must be configured on the device to enable the secure copy protocol on the SSH Server. Note The SSH Version 2 server and the SSH Version 2 client are supported on your Cisco software, depending on your release. (The SSH client runs both the SSH Version 1 protocol and the SSH Version 2 protocol. The SSH client is supported in k9 images depending on your release.) Restrictions for Secure Shell Version 2 Support Secure Shell (SSH) servers and SSH clients are supported in Triple Data Encryption Standard (3DES) software images. Execution Shell, remote command execution, and Secure Copy Protocol (SCP) are the only applications supported. Rivest, Shamir, and Adleman (RSA) key generation is an SSH server-side requirement. Devices that act as SSH clients need not generate RSA keys. The RSA key pair size must be greater than or equal to 768 bits. The following features are not supported: Port forwarding Compression Information About Secure Shell Version 2 Support Secure Shell Version 2 The Secure Shell Version 2 Support feature allows you to configure SSH Version 2. The configuration for the SSH Version 2 server is similar to the configuration for SSH Version 1. The ip ssh version command defines the SSH version to be configured. If you do not configure this command, SSH by default runs in compatibility mode; that is, both SSH Version 1 and SSH Version 2 connections are honored. Note SSH Version 1 is a protocol that has never been defined in a standard. If you do not want your device to fall back to the undefined protocol (Version 1), you should use the ip ssh version command and specify Version 2. The ip ssh rsa keypair-name command enables an SSH connection using the Rivest, Shamir, and Adleman (RSA) keys that you have configured. Previously, SSH was linked to the first RSA keys that were generated (that is, SSH was enabled when the first RSA key pair was generated). This behavior still exists, but by using the ip ssh rsa

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You can use Delinea group policies to manage several aspects of secure shell(ssh) authentication and operation. The Delinea group policies for secure shellare located in the SSH Settings folder after you add thecentrify_unix_settings.xml administrative template to a Group Policy Object.When you enable and configure secure shell group policies, the changes arerecorded in the secure shell configuration file,/etc/centrifydc/ssh/sshd_config, at the next group policy update interval. Tohave your changes take effect immediately, run the adgpupdate command. Delinea puts all of the configuration files for secure shell operations in the/etc/centrifydc/ssh directory. Depending on your operating system, you mightalso have other ssh configuration files stored in the other locations. Whenusers start a secure shell session and use their secure shell rights, theDelinea Agent first checks the /etc/centrifydc/ssh directory for configurationfiles, then looks for configuration file in the /usr/local/etc directory on AIXcomputers, and in /etc/ssh directory on most other Linux and UNIX computers. At a minimum, you should enable the Enable application rights group policyin a Group Policy Object that applies to the site, domain, or organizationalunit that contains Delinea-managed Linux and UNIX computers. To configure the secure shell group policy for application rights On a Windows computer, open the Group Policy Management console. Select an appropriate Group Policy Object, right-click, then select Edit. You can select any Group Policy Object that applies to the site, domain, ororganizational unit that contains Delinea-managed Linux and UNIX computers. Expand Computer Configuration > Policies > Delinea Settings > SSHSettings and double-click Enable application rights. Click Enable, then click OK. This setting adds the following parameter to the/etc/centrifydc/ssh/sshd_config file: ServiceAuthLocation /usr/share/centrifydc/libexec/dzsshchk This parameter sets the path to the dzsshchk command. The dzsshchk commandverifies the access rights for users when they log in with SSH for allcomputers to which the group policy object applies. You can also use secure shell group policies to control other configurationsettings, such as the allowed and denied groups and users and authenticationprocessing. For example, you can use the following group policies to configureoperations for Delinea OpenSSH connections: Add sshd_config properties enables you configure secure shell propertiesdefined in the sshd_config file by group policy. If you enable this grouppolicy, you can add and edit properties as name-value pairs. Allow challenge-response authentication enables you use multi-factorauthentication if you are using the secure shell package installed with the operating system. This group policy is not required if you are using theDelinea OpenSSH package for the agent. Allow groups specifies the list of groups whose members are allowed tolog on through sshd. Allow GSSAPI authentication enables authentication either as the resultof a successful key exchange, or through GSSAPI user authentication. Allow GSSAPI key exchange enables authentication using a key exchangebased on GSSAPI. Allow users specifies the list of users who are allowed to log onthrough sshd. Deny groups specifies the list of groups whose members are not allowedto log on through sshd. Deny users specifies the list of users who are not allowed to log onthrough sshd. Enable application rights allows secure shell applications to grantsecure shell rights. Enable

What is SSH (Secure Shell)?

An IPsec (Data Encryption Standard [DES] or 3DES) encryption software image; the SSH client requires an IPsec (DES or 3DES) encryption software image.) Configure a hostname and host domain for your device by using the hostname and ip domain-name commands in global configuration mode. Related ConceptsSecure Copy ProtocolRestrictions for Configuring Secure Shell The following are restrictions for configuring the Switch for secure shell. The switch supports Rivest, Shamir, and Adelman (RSA) authentication. SSH supports only the execution-shell application. The SSH server and the SSH client are supported only on Data Encryption Standard (DES) (56-bit) and 3DES (168-bit) data encryption software. In DES software images, DES is the only encryption algorithm available. In 3DES software images, both DES and 3DES encryption algorithms are available. The Switch supports the Advanced Encryption Standard (AES) encryption algorithm with a 128-bit key, 192-bit key, or 256-bit key. However, symmetric cipher AES to encrypt the keys is not supported. This software release does not support IP Security (IPSec). When using SCP, you cannot enter the password into the copy command. You must enter the password when prompted. The login banner is not supported in Secure Shell Version 1. It is supported in Secure Shell Version 2. The -l keyword and userid :{number} {ip-address} delimiter and arguments are mandatory when configuring the alternative method of Reverse SSH for console access. Related ConceptsSecure Copy ProtocolInformation about SSHSecure Shell (SSH) is a protocol that provides a secure, remote connection to a device. SSH provides more security for remote connections than Telnet does by providing strong encryption when a device is authenticated. This software release supports SSH Version 1 (SSHv1) and SSH Version 2 (SSHv2).SSH and Switch AccessSSH Servers, Integrated Clients, and Supported VersionsSSH Configuration GuidelinesSecure Copy Protocol Overview Secure Copy ProtocolSSH and Switch AccessSecure Shell (SSH) is a protocol. Ssh secure shell free download - Private Shell SSH Client, Ultimate SSH Shell, Mobile SSH (Secure Shell), and many more programs. download apk 16.2 MB. Ssh-chat is a custom SSH SSH Secure Shell is a program that provides secure communications in end-to-end connections. Download. SSH Secure Shell 3.1.1 SSH Secure Shell provides end-to-end

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Ssh -o numberofpasswordprompt command. Value configured on the device using the ip ssh authentication-retries integer command, plus one. Step 4 ip ssh rekey {time time | volume volume } Example: Device(config)# ip ssh rekey time 108 (Optional) Configures a time-based rekey or a volume-based rekey for SSH. Step 5 exit Example: Device(config)# exit Exits global configuration mode and returns to privileged EXEC mode. Step 6 show ip ssh Example: Device# show ip ssh (Optional) Verifies that the SSH server is enabled and displays the version and configuration data for the SSH connection. Invoking an SSH Client Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. Perform this task to invoke the Secure Shell (SSH) client. The SSH client runs in user EXEC mode and has no specific configuration tasks. Procedure Command or Action Purpose Step 1 enable Example: Device> enable Enables privileged EXEC mode. Enter your password, if prompted. Step 2 ssh -l username -vrf vrf-name ip-address Example: Device# ssh -l user1 -vrf vrf1 192.0.2.1 Invokes the SSH client to connect to an IP host or address in the specified virtual routing and forwarding (VRF) instance. Configuration Examples for Secure Shell Example: Configuring an SSH Server Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. The following is an example of the Secure Shell (SSH) control parameters configured for the server. In this example, the timeout interval of 30 seconds has been specified. This timeout interval is used during the SSH negotiation phase. Device> enableDevice# configure terminalDevice(config)# ip ssh timeout 30Device(config)# end Example: Invoking an SSH Client Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. In the following example, the Secure Shell (SSH) client has been invoked to connect to IP address 192.0.2.1 in the specified virtual routing and forwarding (VRF) instance: Device> enableDevice# ssh -1 user1 -vrf vrf1 192.0.2.1 Example: Verifying SSH Note Unless otherwise noted, the term “SSH” denotes “SSH Version 1” only. To verify that the Secure Shell (SSH) server is enabled and to display the version and configuration data for your SSH connection, use the show ip ssh command. The following example shows that SSH is enabled: Device# show ip sshSSH Enabled - version 1.5Authentication timeout: 120 secs; Authentication retries: 3 The following example shows that SSH is disabled: Device# show ip ssh%SSH has not been enabled To verify the status of your SSH server connections, use the show ssh command. The following example shows the SSH server connections on the device when SSH is enabled: Device# show sshConnection Version Encryption State Username 0 1.5 3DES Session Started guest The following example shows that SSH is disabled: Device# show ssh%No SSH server connections running. Additional References for Secure Shell Related Documents Related Topic Document Title SSH Version 2 Secure Shell Version 2 Support module in the Security Configuration Guide Technical Assistance Description Link The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

What Is SSH (Secure Shell)?

Configure terminalDevice(config)# ip ssh server algorithm kex ecdh-sha2-nistp256 ecdh-sha2-nistp384 ecdh-sha2-nistp521 diffie-hellman-group14-sha1 [email protected](config)# end Example: Configuring Encryption Public Key Algorithms for a Cisco IOS SSH Server Device> enableDevice# configure terminalDevice(config)# ip ssh server algorithm publickey ecdsa-sha2-nistp256 ecdsa-sha2-nistp384 ecdsa-sha2-nistp521 rsa-sha2-256 rsa-sha2-512 ssh-ed25519 ssh-rsa x509v3-ecdsa-sha2-nistp256 x509v3-ecdsa-sha2-nistp384 x509v3-ecdsa-sha2-nistp521 x509v3-ssh-rsa ssh-ed25519Device(config)# end The following example shows how to return to the default behavior in which all public key algorithms are enabled in the predefined order: Device> enableDevice# configure terminalDevice(config)# default ip ssh server algorithm publickeyDevice(config)# end Example: Configuring Host Key Algorithms for a Cisco IOS SSH Server Device> enableDevice# configure terminalDevice(config)# ip ssh server algorithm hostkey x509v3-ssh-rsa rsa-sha2-512 rsa-sha2-256 ssh-rsaaDevice(config)# end Verifying SSH Algorithms for Common Criteria Certification Procedure Step 1 enable Enables privileged EXEC mode. Enter your password if prompted. Example: Device> enable Step 2 show ip ssh Displays configured Secure Shell (SSH) encryption, host key, and Message Authentication Code (MAC) algorithms. Example: The following sample output from the show ip ssh command shows the encryption algorithms configured in the default order: Device# show ip sshEncryption Algorithms: aes128-ctr aes192-ctr aes256-ctr aes128-cbc aes192-cbc aes256-cbc 3des The following sample output from the show ip ssh command shows the MAC algorithms configured in the default order: Device# show ip sshMAC Algorithms: hmac-sha2-256, hmac-sha2-512 The following sample output from the show ip ssh command shows the host key algorithms configured in the default order: Device# show ip sshHostkey Algorithms: x509v3-ssh-rsa, ssh-rsa Feature History for Secure Shell Algorithms for Common Criteria Certification This table provides release and related information for the features explained in this module. These features are available in all the releases subsequent to the one they were introduced in, unless noted otherwise. Release Feature Feature Information Cisco IOS XE Everest 16.5.1a Secure Shell Algorithms for Common Criteria Certification The SSH Algorithms for Common Criteria Certification feature provides the list and order of the algorithms that are allowed for Common Criteria Certification. This module describes how to configure the encryption, Message Authentication Code (MAC), and host key algorithms for a secure shell (SSH) server and client so that SSH connections can be limited on the basis of the allowed algorithms list. Cisco IOS XE Cupertino 17.7.1 Secure Shell Algorithms for Common Criteria Certification This feature was implemented on supervisor modules C9400X-SUP-2 and C9400X-SUP-2XL. Cisco IOS XE Cupertino 17.8.1 Secure Shell Encryption Algorithms Cisco IOS SSH Server and Client support for the following encryption algorithms have been introduced: [email protected] [email protected] [email protected] Cisco IOS XE Cupertino 17.9.1 Secure Shell Encryption Algorithms Cisco IOS SSH Server and Client support for the following encryption algorithms have been introduced: [email protected] [email protected] Use the Cisco Feature Navigator to find information about platform and software image support. To access Cisco Feature Navigator, go to. Ssh secure shell free download - Private Shell SSH Client, Ultimate SSH Shell, Mobile SSH (Secure Shell), and many more programs. download apk 16.2 MB. Ssh-chat is a custom SSH SSH Secure Shell is a program that provides secure communications in end-to-end connections. Download. SSH Secure Shell 3.1.1 SSH Secure Shell provides end-to-end

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Configuring Secure Shell (SSH) Finding Feature InformationPrerequisites for Configuring Secure ShellRestrictions for Configuring Secure ShellInformation about SSHHow to Configure SSHMonitoring the SSH Configuration and StatusAdditional ReferencesFeature Information for SSHFinding Feature InformationYour software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http:/​/​www.cisco.com/​go/​cfn. An account on Cisco.com is not required. Prerequisites for Configuring Secure Shell The following are the prerequisites for configuring the switch for secure shell (SSH): For SSH to work, the switch needs an Rivest, Shamir, and Adleman (RSA) public/private key pair. This is the same with Secure Copy Protocol (SCP), which relies on SSH for its secure transport. Before enabling SCP, you must correctly configure SSH, authentication, and authorization on the switch. Because SCP relies on SSH for its secure transport, the router must have an Rivest, Shamir, and Adelman (RSA) key pair. SCP relies on SSH for security. SCP requires that authentication, authorization, and accounting (AAA) authorization be configured so the router can determine whether the user has the correct privilege level. A user must have appropriate authorization to use SCP. A user who has appropriate authorization can use SCP to copy any file in the Cisco IOS File System (IFS) to and from a switch by using the copy command. An authorized administrator can also do this from a workstation. The Secure Shell (SSH) server requires