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Authentication, Authorization, and Accounting Configuration Guide, Cisco IOS Release 15M&T

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Book Title

Authentication, Authorization, and Accounting Configuration Guide, Cisco IOS Release 15M&T

Chapter Title

Message Banners for AAA Authentication

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Updated:
January 26, 2018

Chapter: Message Banners for AAA Authentication

Message Banners for AAA Authentication

The Message Banners for AAA authentication feature is used to configure personalized login and failed-login banners for user authentication. The message banners are displayed when a user logs in to the system to be authenticated using authentication, authorization, and accounting (AAA) and when an authentication fails.

Finding Feature Information

Your 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.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Information About Message Banners for AAA Authentication

Login and Failed-Login Banners for AAA Authentication

Login and failed-login banners use a delimiting character that notifies the system of the exact text string that must be displayed as the banner for authorization, authentication, and accounting (AAA) authentication. The delimiting character is repeated at the end of the text string to signify the end of the login or failed-login banner. The delimiting character can be any single character in the extended ASCII character set, but once defined as the delimiter, that character cannot be used in the text string for the banner.

You can display a maximum of 2996 characters in a login or failed-login banner.

How to Configure Message Banners for AAA Authentication

Configuring a Login Banner for AAA Authentication

Perform this task to configure a banner that is displayed when a user logs in (replacing the default message for login). Use the no aaa authentication banner command to disable a login banner.

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    aaa new-model

    4.    aaa authentication banner delimiter-string delimiter

    5.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2configure terminal


    Example:
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3aaa new-model


    Example:
    Device(config)# aaa new-model
     

    Enables AAA globally.

     
    Step 4aaa authentication banner delimiter-string delimiter


    Example:
    Device(config)# aaa authentication banner *Unauthorized Access Prohibited*
     

    Creates a personalized login banner.

     
    Step 5end


    Example:
    Device(config)# end
     

    Returns to privileged EXEC mode.

     

    Configuring a Failed-Login Banner for AAA Authentication

    Perform this task to configure a failed-login banner that is displayed when a user login fails (replacing the default message for failed login). Use the no aaa authentication fail-message command to disable a failed-login banner.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    aaa new-model

      4.    aaa authentication banner delimiter-string delimiter

      5.    aaa authentication fail-message delimiter-string delimiter

      6.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1enable


      Example:
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2configure terminal


      Example:
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3aaa new-model


      Example:
      Device(config)# aaa new-model
       

      Enters AAA globally.

       
      Step 4aaa authentication banner delimiter-string delimiter


      Example:
      Device(config)# aaa authentication banner *Unauthorized Access Prohibited*
       

      Creates a personalized login banner.

       
      Step 5aaa authentication fail-message delimiter-string delimiter


      Example:
      Device(config)# aaa authentication fail-message *Failed login. Try again*
       

      Creates a message to be displayed when a user login fails.

       
      Step 6end


      Example:
      Device(config)# end
       

      Returns to privileged EXEC mode.

       

      Configuration Examples for Message Banners for AAA Authentication

      Example: Configuring Login and Failed-Login Banners for AAA Authentication

      The following example shows how to configure a login banner that is displayed when a user logs in to the system, (in this case, the phrase “Unauthorized Access Prohibited”). The asterisk (*) is used as the delimiting character. RADIUS is specified as the default login authentication method. 

      Device> enable
Device# configure terminal
Device(config)# aaa new-model
Device(config)# aaa authentication banner *Unauthorized Access Prohibited*
Device(config)# aaa authentication login default group radius

      This configuration displays the following login banner: 

      Unauthorized Access Prohibited
Username:

      The following example shows how to configure a failed-login banner that is displayed when a user tries to log in to the system and fails, (in this case, the phrase “Failed login. Try again”). The asterisk (*) is used as the delimiting character. RADIUS is specified as the default login authentication method. 

      Device> enable
Device# configure terminal
Device(config)# aaa new-model
Device(config)# aaa authentication banner *Unauthorized Access Prohibited*
Device(config)# aaa authentication fail-message *Failed login. Try again.*
Device(config)# aaa authentication login default group radius

      This configuration displays the following login and failed-login banner: 

      Unauthorized Access Prohibited
Username: 
Password: 
Failed login. Try again.

      Additional References for Message Banners for AAA Authentication

      Related Documents

      Related Topic

      Document Title

      Cisco IOS commands

      Cisco IOS Master Command List, All Releases

      Security commands

      Configuring AAA

      Authentication, Authorization, and Accounting Configuration Guide

      Technical Assistance

      Description

      Link

      The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

      http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

      Feature Information for Message Banners for AAA Authentication

      The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

      Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.
      Table 1 Feature Information for Message Banners for AAA Authentication

      Feature Name

      Releases

      Feature Information

      Message Banners for AAA Authentication

      11.3(4)T

      12.2(27)SBA

      12.2(33)SRC

      15.3(1)S

      The Message Banners for AAA Authentication feature enables you to configure personalized login and failed-login banners for user authentication. The message banners are displayed when a user logs in to the system to be authenticated using authentication, authorization, and accounting (AAA) and when an authentication fails.

      The following commands were introduced or modified: aaa authentication banner, aaa authentication fail-message, aaa new-model.

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