SSH Tectia 
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    About This Document >>
    Installing SSH Tectia Server for IBM z/OS >>
    Getting Started with SSH Tectia Server for IBM z/OS >>
    Configuring the Server >>
    Authentication >>
        Using the z/OS System Authorization Facility
        Server Authentication with Public Keys in File >>
        Server Authentication with Certificates >>
        User Authentication with Passwords
        User Authentication with Public Keys in File >>
        User Authentication with Certificates >>
        Host-Based User Authentication >>
        User Authentication with Keyboard-Interactive
    System Administration >>
    File Transfer Using SFTP >>
    Secure File Transfer Using Transparent FTP Security >>
    Tunneling >>
    Troubleshooting SSH Tectia Server for IBM z/OS >>
    Man Pages and Default Configuration Files >>
    Log Messages >>

User Authentication with Keyboard-Interactive

Keyboard-interactive is a generic authentication method that can be used to implement different types of authentication mechanisms. Any currently supported authentication method that requires only the user's input can be performed with keyboard-interactive.

Currently on SSH Tectia Server for IBM z/OS, the supported submethods for keyboard-interactive are password and plugin.

Methods that require passing some binary information, such as public-key authentication, cannot be used as submethods of keyboard-interactive. But public-key authentication, for example, can be used as an additional method alongside keyboard-interactive authentication.

Note: The client cannot request any specific keyboard-interactive submethod if the server allows several optional submethods. The order in which the submethods are offered depends on the server configuration. However, if the server allows, for example, the two optional submethods SecurID and password, the user can skip SecurID by pressing enter when SecurID is offered by the server. The user will then be prompted for a password.

Keyboard-interactive is not enabled by default on the server. To set up keyboard-interactive authentication, do the following steps:

  1. Include the following line in the /opt/tectia/etc/sshd2_config file:
    AllowedAuthentications   keyboard-interactive
    
    Also other authentication methods can be listed.
  2. The submethods and policy for keyboard-interactive are configured as follows:
    AuthKbdInt.Required       password
    AuthKdbInt.Optional       password,plugin
    AuthKbdInt.NumOptional    1
    AuthKbdInt.FailureTimeout 2
    ...
    

    The default number of optional submethods that must be passed is 0, although if no required submethods are specified, the client must always pass at least one optional submethod.

    See the sshd2_config man pages for more information on the keywords (Appendix sshd2_config).

  3. (Optional) You can configure password change for the password submethod with the two configuration variables described in Section User Authentication with Passwords.
  4. Restart the server as instructed in Section Restarting sshd2.

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