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Security Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)

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Book Title

Security Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)

Chapter Title

Configuring Web-Based Authentication

Results

Updated:
January 31, 2018

Chapter: Configuring Web-Based Authentication

Configuring Web-Based Authentication

This chapter describes how to configure web-based authentication on the switch. It contains these sections:

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 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.

Web-Based Authentication Overview

Use the web-based authentication feature, known as web authentication proxy, to authenticate end users on host systems that do not run the IEEE 802.1x supplicant.


Note

You can configure web-based authentication on Layer 2 and Layer 3 interfaces.

When you initiate an HTTP session, web-based authentication intercepts ingress HTTP packets from the host and sends an HTML login page to the users. The users enter their credentials, which the web-based authentication feature sends to the authentication, authorization, and accounting (AAA) server for authentication.

If authentication succeeds, web-based authentication sends a Login-Successful HTML page to the host and applies the access policies returned by the AAA server.

If authentication fails, web-based authentication forwards a Login-Fail HTML page to the user, prompting the user to retry the login. If the user exceeds the maximum number of attempts, web-based authentication forwards a Login-Expired HTML page to the host, and the user is placed on a watch list for a waiting period.


Note

HTTPS traffic interception for central web authentication redirect is not supported.


Note

You should use global parameter-map (for method-type, custom, and redirect) only for using the same web authentication methods like consent, web consent, and webauth, for all the clients and SSIDs. This ensures that all the clients have the same web-authentication method.

If the requirement is to use Consent for one SSID and Web-authentication for another SSID, then you should use two named parameter-maps. You should configure Consent in first parameter-map and configure webauth in second parameter-map.


Note

The traceback that you receive when webauth client tries to do authentication does not have any performance or behavioral impact. It happens rarely when the context for which FFM replied back to EPM for ACL application is already dequeued (possibly due to timer expiry) and the session becomes ‘unauthorized’.

Based on where the web pages are hosted, the local web authention can be categorozied as follows:

  • Internal—The internal default HTML pages (Login, Success, Fail, and Expire) in the controller are used during the local web authentication.

  • Customized—The customized web pages (Login, Success, Fail, and Expire) are downloaded onto the controller and used during the local web authentication.

  • External—The customized web pages are hosted on the external web server instead of using the in-built or custom web pages.

Based on the various web authentication pages, the types of web authentication are as follows:

  • Webauth—This is a basic web authentication. Herein, the controller presents a policy page with the user name and password. You need to enter the correct credentials to access the network.

  • Consent or web-passthrough—Herein, the controller presents a policy page with the Accept or Deny buttons. You need to click the Accept button to access the network.

  • Webconsent—This is a combination of webauth and consent web authentication types. Herein, the controller presents a policy page with Accept or Deny buttons along with user name or password. You need to enter the correct credentials and click the Accept button to access the network.


Note

The Wireless web authentication feature does not support the bypass type.

Device Roles

With web-based authentication, the devices in the network have these specific roles:

  • Client—The device (workstation) that requests access to the LAN and the services and responds to requests from the switch. The workstation must be running an HTML browser with Java Script enabled.

  • Authentication server—Authenticates the client. The authentication server validates the identity of the client and notifies the switch that the client is authorized to access the LAN and the switch services or that the client is denied.

  • Switch—Controls the physical access to the network based on the authentication status of the client. The switch acts as an intermediary (proxy) between the client and the authentication server, requesting identity information from the client, verifying that information with the authentication server, and relaying a response to the client.

Figure 1. Web-Based Authentication Device Roles. This figure shows the roles of these devices in a network.

Host Detection

The switch maintains an IP device tracking table to store information about detected hosts.


Note

By default, the IP device tracking feature is disabled on a switch. You must enable the IP device tracking feature to use web-based authentication.

For Layer 2 interfaces, web-based authentication detects IP hosts by using these mechanisms:

  • ARP based trigger—ARP redirect ACL allows web-based authentication to detect hosts with a static IP address or a dynamic IP address.

  • Dynamic ARP inspection

  • DHCP snooping—Web-based authentication is notified when the switch creates a DHCP-binding entry for the host.

Session Creation

When web-based authentication detects a new host, it creates a session as follows:

  • Reviews the exception list.

    If the host IP is included in the exception list, the policy from the exception list entry is applied, and the session is established.

  • Reviews for authorization bypass

    If the host IP is not on the exception list, web-based authentication sends a nonresponsive-host (NRH) request to the server.

    If the server response is access accepted, authorization is bypassed for this host. The session is established.

  • Sets up the HTTP intercept ACL

    If the server response to the NRH request is access rejected, the HTTP intercept ACL is activated, and the session waits for HTTP traffic from the host.

Authentication Process

When you enable web-based authentication, these events occur:

  • The user initiates an HTTP session.

  • The HTTP traffic is intercepted, and authorization is initiated. The switch sends the login page to the user. The user enters a username and password, and the switch sends the entries to the authentication server.

  • If the authentication succeeds, the switch downloads and activates the user’s access policy from the authentication server. The login success page is sent to the user.

  • If the authentication fails, the switch sends the login fail page. The user retries the login. If the maximum number of attempts fails, the switch sends the login expired page, and the host is placed in a watch list. After the watch list times out, the user can retry the authentication process.

  • If the authentication server does not respond to the switch, and if an AAA fail policy is configured, the switch applies the failure access policy to the host. The login success page is sent to the user.

  • The switch reauthenticates a client when the host does not respond to an ARP probe on a Layer 2 interface, or when the host does not send any traffic within the idle timeout on a Layer 3 interface.

  • The feature applies the downloaded timeout or the locally configured session timeout.


    Note

    Beginning with Cisco IOS XE Denali 16.1.1 and later, the default session timeout value for web-based authentication on WLC is 1800 seconds. The default session timeout value was infinite seconds, prior to Cisco IOS XE Denali 16.1.1.

  • If the terminate action is RADIUS, the feature sends a nonresponsive host (NRH) request to the server. The terminate action is included in the response from the server.

  • If the terminate action is default, the session is dismantled, and the applied policy is removed.

Local Web Authentication Banner

With Web Authentication, you can create a default and customized web-browser banners that appears when you log in to a switch.

The banner appears on both the login page and the authentication-result pop-up pages. The default banner messages are as follows:

  • Authentication Successful

  • Authentication Failed

  • Authentication Expired

The Local Web Authentication Banner can be configured in legacy CLIs as follows:

  • Legacy mode—Use the ip admission auth-proxy-banner http global configuration command.

  • New-style mode—Use the parameter-map type webauth global bannerglobal configuration command.

The default banner Cisco Systems and Switch host-name Authentication appear on the Login Page. Cisco Systems appears on the authentication result pop-up page.

Figure 2. Authentication Successful Banner

The banner can be customized as follows:

  • Add a message, such as switch, router, or company name to the banner:

    • Legacy mode—Use the ip admission auth-proxy-banner http banner-textglobal configuration command.

    • New-style mode—Use the parameter-map type webauth global banner global configuration command

  • Add a logo or text file to the banner:

    • Legacy mode—Use the ip admission auth-proxy-banner http file-path global configuration command.

    • New-style mode—Use the parameter-map type webauth global banner global configuration command

    Figure 3. Customized Web Banner

If you do not enable a banner, only the username and password dialog boxes appear in the web authentication login screen, and no banner appears when you log into the switch.

Figure 4. Login Screen With No Banner

For more information, see the Session Aware Networking Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches) Session Aware Networking Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches) and the Web Authentication Enhancements - Customizing Authentication Proxy Web Pages.

Web Authentication Customizable Web Pages

During the web-based authentication process, the switch internal HTTP server hosts four HTML pages to deliver to an authenticating client. The server uses these pages to notify you of these four-authentication process states:

  • Login—Your credentials are requested.

  • Success—The login was successful.

  • Fail—The login failed.

  • Expire—The login session has expired because of excessive login failures.

Guidelines

  • You can substitute your own HTML pages for the default internal HTML pages.

  • You can use a logo or specify text in the login, success, failure, and expire web pages.

  • On the banner page, you can specify text in the login page.

  • The pages are in HTML.

  • You must include an HTML redirect command in the success page to access a specific URL.

  • The URL string must be a valid URL (for example, http://www.cisco.com). An incomplete URL might cause page not found or similar errors on a web browser.

  • If you configure web pages for HTTP authentication, they must include the appropriate HTML commands (for example, to set the page time out, to set a hidden password, or to confirm that the same page is not submitted twice).

  • The CLI command to redirect users to a specific URL is not available when the configured login form is enabled. The administrator should ensure that the redirection is configured in the web page.

  • If the CLI command redirecting users to specific URL after authentication occurs is entered and then the command configuring web pages is entered, the CLI command redirecting users to a specific URL does not take effect.

  • Configured web pages can be copied to the switch boot flash or flash.

  • On stackable switches, configured pages can be accessed from the flash on the stack master or members.

  • The login page can be on one flash, and the success and failure pages can be another flash (for example, the flash on the stack master or a member).

  • You must configure all four pages.

  • The banner page has no effect if it is configured with the web page.

  • All of the logo files (image, flash, audio, video, and so on) that are stored in the system directory (for example, flash, disk0, or disk) and that must be displayed on the login page must use web_auth_<filename> as the file name.

  • The configured authentication proxy feature supports both HTTP and SSL.

You can substitute your HTML pages for the default internal HTML pages. You can also specify a URL to which users are redirected after authentication occurs, which replaces the internal Success page.

Figure 5. Customizable Authentication Page

Authentication Proxy Web Page Guidelines

When configuring customized authentication proxy web pages, follow these guidelines:

  • To enable the custom web pages feature, specify all four custom HTML files. If you specify fewer than four files, the internal default HTML pages are used.

  • The four custom HTML files must be present on the flash memory of the switch. The maximum size of each HTML file is 8 KB.

  • Any images on the custom pages must be on an accessible HTTP server. Configure an intercept ACL within the admission rule.

  • Any external link from a custom page requires configuration of an intercept ACL within the admission rule.

  • To access a valid DNS server, any name resolution required for external links or images requires configuration of an intercept ACL within the admission rule.

  • If the custom web pages feature is enabled, a configured auth-proxy-banner is not used.

  • If the custom web pages feature is enabled, the redirection URL for successful login feature is not available.

  • To remove the specification of a custom file, use the no form of the command.

Because the custom login page is a public web form, consider these guidelines for the page:

  • The login form must accept user entries for the username and password and must show them as uname and pwd.

  • The custom login page should follow best practices for a web form, such as page timeout, hidden password, and prevention of redundant submissions.

Related Information
Customizing the Authentication Proxy Web Pages

Redirection URL for Successful Login Guidelines

When configuring a redirection URL for successful login, consider these guidelines:

  • If the custom authentication proxy web pages feature is enabled, the redirection URL feature is disabled and is not available in the CLI. You can perform redirection in the custom-login success page.

  • If the redirection URL feature is enabled, a configured auth-proxy-banner is not used

  • To remove the specification of a redirection URL, use the no form of the command.

  • If the redirection URL is required after the web-based authentication client is successfully authenticated, then the URL string must start with a valid URL (for example, http://) followed by the URL information. If only the URL is given without http://, then the redirection URL on successful authentication might cause page not found or similar errors on a web browser.

Related Information
Specifying a Redirection URL for Successful Login

Web-based Authentication Interactions with Other Features

Port Security

You can configure web-based authentication and port security on the same port. Web-based authentication authenticates the port, and port security manages network access for all MAC addresses, including that of the client. You can then limit the number or group of clients that can access the network through the port.

Related Information
Enabling and Configuring Port Security

LAN Port IP

You can configure LAN port IP (LPIP) and Layer 2 web-based authentication on the same port. The host is authenticated by using web-based authentication first, followed by LPIP posture validation. The LPIP host policy overrides the web-based authentication host policy.

If the web-based authentication idle timer expires, the NAC policy is removed. The host is authenticated, and posture is validated again.

Gateway IP

You cannot configure Gateway IP (GWIP) on a Layer 3 VLAN interface if web-based authentication is configured on any of the switch ports in the VLAN.

You can configure web-based authentication on the same Layer 3 interface as Gateway IP. The host policies for both features are applied in software. The GWIP policy overrides the web-based authentication host policy.

ACLs

If you configure a VLAN ACL or a Cisco IOS ACL on an interface, the ACL is applied to the host traffic only after the web-based authentication host policy is applied.

For Layer 2 web-based authentication, it is more secure, though not required, to configure a port ACL (PACL) as the default access policy for ingress traffic from hosts connected to the port. After authentication, the web-based authentication host policy overrides the PACL. The Policy ACL is applied to the session even if there is no ACL configured on the port.

You cannot configure a MAC ACL and web-based authentication on the same interface.

You cannot configure web-based authentication on a port whose access VLAN is configured for VACL capture.

Context-Based Access Control

Web-based authentication cannot be configured on a Layer 2 port if context-based access control (CBAC) is configured on the Layer 3 VLAN interface of the port VLAN.

EtherChannel

You can configure web-based authentication on a Layer 2 EtherChannel interface. The web-based authentication configuration applies to all member channels.

How to Configure Web-Based Authentication

Default Web-Based Authentication Configuration

The following table shows the default web-based authentication configuration.



Table 1 Default Web-based Authentication Configuration

Feature

Default Setting

AAA

Disabled

RADIUS server

  • IP address

  • UDP authentication port

  • Key

  • None specified

  • 1645

  • None specified

Default value of inactivity timeout

3600 seconds

Inactivity timeout

Enabled

Web-Based Authentication Configuration Guidelines and Restrictions

  • Web-based authentication is an ingress-only feature.

  • You can configure web-based authentication only on access ports. Web-based authentication is not supported on trunk ports, EtherChannel member ports, or dynamic trunk ports.

  • External web authentication, where the switch redirects a client to a particular host or web server for displaying login message, is not supported.

  • You cannot authenticate hosts on Layer 2 interfaces with static ARP cache assignment. These hosts are not detected by the web-based authentication feature because they do not send ARP messages.

  • By default, the IP device tracking feature is disabled on a switch. You must enable the IP device tracking feature to use web-based authentication.

  • You must configure at least one IP address to run the switch HTTP server. You must also configure routes to reach each host IP address. The HTTP server sends the HTTP login page to the host.

  • Hosts that are more than one hop away might experience traffic disruption if an STP topology change results in the host traffic arriving on a different port. This occurs because the ARP and DHCP updates might not be sent after a Layer 2 (STP) topology change.

  • Web-based authentication does not support VLAN assignment as a downloadable-host policy.

  • Web-based authentication supports IPv6 in Session-aware policy mode. IPv6 Web-authentication requires at least one IPv6 address configured on the switch and IPv6 Snooping configured on the switchport.

  • Web-based authentication and Network Edge Access Topology (NEAT) are mutually exclusive. You cannot use web-based authentication when NEAT is enabled on an interface, and you cannot use NEAT when web-based authentication is running on an interface.

  • Web-based authentication NRH (Non-Responsive Host) is not supported for voice devices.

  • Only the Password Authentication Protocol (PAP) is supported for web-based RADIUS authentication on controllers. The Challenge Handshake Authentication Protocol (CHAP) is not supported for web-based RADIUS authentication on controllers.

  • Identify the following RADIUS security server settings that will be used while configuring switch-to-RADIUS-server communication:

    • Host name

    • Host IP address

    • Host name and specific UDP port numbers

    • IP address and specific UDP port numbers

    The combination of the IP address and UDP port number creates a unique identifier, that enables RADIUS requests to be sent to multiple UDP ports on a server at the same IP address. If two different host entries on the same RADIUS server are configured for the same service (for example, authentication) the second host entry that is configured functions as the failover backup to the first one. The RADIUS host entries are chosen in the order that they were configured.

  • When you configure the RADIUS server parameters:

    • Specify the key string on a separate command line.

    • For key string, specify the authentication and encryption key used between the switch and the RADIUS daemon running on the RADIUS server. The key is a text string that must match the encryption key used on the RADIUS server.

    • When you specify the key string, use spaces within and at the end of the key. If you use spaces in the key, do not enclose the key in quotation marks unless the quotation marks are part of the key. This key must match the encryption used on the RADIUS daemon.

    • You can globally configure the timeout, retransmission, and encryption key values for all RADIUS servers by using with the radius-server host global configuration command. If you want to configure these options on a per-server basis, use the radius-server timeout, radius-server transmit, and the radius-server key global configuration commands. For more information, see the Cisco IOS Security Configuration Guide, Release 12.4 and the Cisco IOS Security Command Reference, Release 12.4.


      Note

      You need to configure some settings on the RADIUS server, including: the switch IP address, the key string to be shared by both the server and the switch, and the downloadable ACL (DACL). For more information, see the RADIUS server documentation.

Web-Based Authentication Configuration Task List

Configuring the Authentication Rule and Interfaces

Examples in this section are legacy-style configurations. For new-style configurations, see the Session Aware Networking Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)

Follow these steps to configure the authentication rule and interfaces:

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    ip admission name name proxy http

    4.    interface type slot/port

    5.    ip access-group name

    6.    ip admission name

    7.    exit

    8.    ip device tracking

    9.    end

    10.    show ip admission status

    11.    copy running-config startup-config


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example: 
    Switch> enable
     

    Enables privileged EXEC mode. Enter your password if prompted.

     
    Step 2configure terminal


    Example: 
    
Switch# configure terminal
     

    Enters the global configuration mode.

     
    Step 3ip admission name name proxy http


    Example: 
    
Switch(config)# ip admission name webauth1 proxy http
     

    Configures an authentication rule for web-based authorization.

     
    Step 4interface type slot/port


    Example: 
    Switch(config)# interface gigabitEthernet1/0/1
     

    Enters interface configuration mode and specifies the ingress Layer 2 or Layer 3 interface to be enabled for web-based authentication.

    type can be fastethernet, gigabit ethernet, or tengigabitethernet.

     
    Step 5ip access-group name


    Example: 
    
Switch(config-if)# ip access-group webauthag
     

    Applies the default ACL.

     
    Step 6ip admission name


    Example: 
    Switch(config)# ip admission name
     

    Configures an authentication rule for web-based authorization for the interface.

     
    Step 7exit


    Example: 
    
Switch(config-if)# exit
     

    Returns to configuration mode.

     
    Step 8ip device tracking


    Example: 
    
Switch(config)# ip device tracking
     

    Enables the IP device tracking table.

     
    Step 9end


    Example: 
    
Switch(config)# end
     

    Returns to privileged EXEC mode.

     
    Step 10show ip admission status


    Example: 
    
Switch# show ip admission status
     

    Displays the configuration.

     
    Step 11copy running-config startup-config


    Example: 
    Switch# copy running-config startup-config
     

    (Optional) Saves your entries in the configuration file.

     

    Configuring AAA Authentication

    If a method-list is configured under VTY lines, the corresponding method list must be added to the AAA configuration: 
    line vty 0 4 
 authorization commands 15 abc
aaa authorization commands 15 abc group tacacs+
    If a method-list is not configured under VTY lines, you must add the default method list to the AAA configuration: 
    line vty 0 4
 aaa authorization commands 15 default group tacacs+

    Follow these steps to configure AAA authentication:


    Note

    Use default list for AAA authorization, if you are planning to use features such as dACL.

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    aaa new-model

      4.    aaa authentication login default group {tacacs+ | radius}

      5.    aaa authorization auth-proxy default group {tacacs+ | radius}

      6.    tacacs-server host {hostname | ip_address}

      7.    tacacs-server key {key-data}

      8.    end

      9.    show running-config

      10.    copy running-config startup-config


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example: 
      Switch> enable
       

      Enables privileged EXEC mode. Enter your password if prompted.

       
      Step 2configure terminal


      Example: 
      
Switch# configure terminal
       

      Enters the global configuration mode.

       
      Step 3aaa new-model


      Example: 
      
Switch(config)# aaa new-model
       

      Enables AAA functionality.

       
      Step 4aaa authentication login default group {tacacs+ | radius}


      Example: 
      
Switch(config)# aaa authentication login default group tacacs+
       

      Defines the list of authentication methods at login.

      named_authentication_list refers to any name that is not greater than 31 characters.

      AAA_group_name refers to the server group name. You need to define the server-group server_name at the beginning itself.

       
      Step 5aaa authorization auth-proxy default group {tacacs+ | radius}


      Example: 
      
Switch(config)# aaa authorization auth-proxy default group tacacs+
       

      Creates an authorization method list for web-based authorization.

       
      Step 6tacacs-server host {hostname | ip_address}


      Example: 
      
Switch(config)# tacacs-server host 10.1.1.1
       

      Specifies an AAA server.

       
      Step 7tacacs-server key {key-data}


      Example: 
      Switch(config)# tacacs-server key
       

      Configures the authorization and encryption key used between the switch and the TACACS server.

       
      Step 8end


      Example: 
      
Switch(config)# end
       

      Returns to privileged EXEC mode.

       
      Step 9show running-config


      Example: 
      
Switch# show running-config
       

      Verifies your entries.

       
      Step 10copy running-config startup-config


      Example: 
      Switch# copy running-config startup-config
       

      (Optional) Saves your entries in the configuration file.

       

      Configuring Switch-to-RADIUS-Server Communication

      Follow these steps to configure the RADIUS server parameters:

      SUMMARY STEPS

        1.    enable

        2.    configure terminal

        3.    ip radius source-interface vlan vlan interface number

        4.    radius-server host {hostname | ip-address} test username username

        5.    radius-server key string

        6.    radius-server dead-criteria tries num-tries

        7.    end


      DETAILED STEPS
         Command or ActionPurpose
        Step 1 enable


        Example: 
        Switch> enable
         

        Enables privileged EXEC mode. Enter your password if prompted.

         
        Step 2configure terminal


        Example: 
        
Switch# configure terminal
         

        Enters the global configuration mode.

         
        Step 3ip radius source-interface vlan vlan interface number


        Example: 
        
Switch(config)# ip radius source-interface vlan 80
         

        Specifies that the RADIUS packets have the IP address of the indicated interface.

         
        Step 4radius-server host {hostname | ip-address} test username username


        Example: 
        Switch(config)# radius-server host 172.l20.39.46 test username user1
         

        Specifies the host name or IP address of the remote RADIUS server.

        The test username username option enables automated testing of the RADIUS server connection. The specified username does not need to be a valid user name.

        The key option specifies an authentication and encryption key to use between the switch and the RADIUS server.

        To use multiple RADIUS servers, reenter this command for each server.

         
        Step 5radius-server key string


        Example: 
        Switch(config)# radius-server key rad123
         

        Configures the authorization and encryption key used between the switch and the RADIUS daemon running on the RADIUS server.

         
        Step 6radius-server dead-criteria tries num-tries


        Example: 
        Switch(config)# radius-server dead-criteria tries 30
         

        Specifies the number of unanswered sent messages to a RADIUS server before considering the server to be inactive. The range of num-tries is 1 to 100.

         
        Step 7end


        Example: 
        
Switch(config)# end
         

        Returns to privileged EXEC mode.

         

        Configuring the HTTP Server

        To use web-based authentication, you must enable the HTTP server within the Switch. You can enable the server for either HTTP or HTTPS.


        Note

        The Apple psuedo-browser will not open if you configure only the ip http secure-server command. You should also configure the ip http server command.

        Follow these steps to enable the server for either HTTP or HTTPS:

        SUMMARY STEPS

          1.    enable

          2.    configure terminal

          3.    ip http server

          4.    ip http secure-server

          5.    end


        DETAILED STEPS
           Command or ActionPurpose
          Step 1 enable


          Example: 
          Switch> enable
           

          Enables privileged EXEC mode. Enter your password if prompted.

           
          Step 2configure terminal


          Example: 
          
Switch# configure terminal
           

          Enters the global configuration mode.

           
          Step 3ip http server


          Example: 
          
Switch(config)# ip http server
           

          Enables the HTTP server. The web-based authentication feature uses the HTTP server to communicate with the hosts for user authentication.

           
          Step 4ip http secure-server


          Example: 
          
Switch(config)# ip http secure-server
           

          Enables HTTPS.

          You can configure custom authentication proxy web pages or specify a redirection URL for successful login.

          Note   

          To ensure secure authentication when you enter the ip http secure-server command, the login page is always in HTTPS (secure HTTP) even if the user sends an HTTP request.

           
          Step 5end


          Example: 
          
Switch(config)# end
           

          Returns to privileged EXEC mode.

           

          Customizing the Authentication Proxy Web Pages

          You can configure web authentication to display four substitute HTML pages to the user in place of the Switch default HTML pages during web-based authentication.

          For the equivalent Session Aware Networking configuration example for this feature, see the section "Configuring a Parameter Map for Web-Based Authentication" in the chapter, "Configuring Identity Control Policies." of the book, "Session Aware Networking Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)."

          Follow these steps to specify the use of your custom authentication proxy web pages:

          Before You Begin

          Store your custom HTML files on the Switch flash memory.

          SUMMARY STEPS

            1.    enable

            2.    configure terminal

            3.    ip admission proxy http login page file device:login-filename

            4.    ip admission proxy http success page file device:success-filename

            5.    ip admission proxy http failure page file device:fail-filename

            6.    ip admission proxy http login expired page file device:expired-filename

            7.    end


          DETAILED STEPS
             Command or ActionPurpose
            Step 1 enable


            Example: 
            Switch> enable
             

            Enables privileged EXEC mode. Enter your password if prompted.

             
            Step 2configure terminal


            Example: 
            
Switch# configure terminal
             

            Enters the global configuration mode.

             
            Step 3ip admission proxy http login page file device:login-filename


            Example: 
            
Switch(config)# ip admission proxy http login page file disk1:login.htm
             

            Specifies the location in the Switch memory file system of the custom HTML file to use in place of the default login page. The device: is flash memory.

             
            Step 4ip admission proxy http success page file device:success-filename


            Example: 
            
Switch(config)# ip admission proxy http success page file disk1:success.htm
             

            Specifies the location of the custom HTML file to use in place of the default login success page.

             
            Step 5ip admission proxy http failure page file device:fail-filename


            Example: 
            
Switch(config)# ip admission proxy http fail page file disk1:fail.htm
             

            Specifies the location of the custom HTML file to use in place of the default login failure page.

             
            Step 6ip admission proxy http login expired page file device:expired-filename


            Example: 
            Switch(config)# ip admission proxy http login expired page file disk1:expired.htm
             

            Specifies the location of the custom HTML file to use in place of the default login expired page.

             
            Step 7end


            Example: 
            
Switch(config)# end
             

            Returns to privileged EXEC mode.

             
            Related Information
            Authentication Proxy Web Page Guidelines

            Specifying a Redirection URL for Successful Login

            Follow these steps to specify a URL to which the user is redirected after authentication, effectively replacing the internal Success HTML page:

            SUMMARY STEPS

              1.    enable

              2.    configure terminal

              3.    ip admission proxy http success redirect url-string

              4.    end


            DETAILED STEPS
               Command or ActionPurpose
              Step 1 enable


              Example: 
              Switch> enable
               

              Enables privileged EXEC mode. Enter your password if prompted.

               
              Step 2configure terminal


              Example: 
              
Switch# configure terminal
               

              Enters the global configuration mode.

               
              Step 3ip admission proxy http success redirect url-string


              Example: 
              
Switch(config)# ip admission proxy http success redirect www.example.com
               

              Specifies a URL for redirection of the user in place of the default login success page.

               
              Step 4end


              Example: 
              
Switch(config)# end
               

              Returns to privileged EXEC mode.

               
              Related Information
              Redirection URL for Successful Login Guidelines

              Configuring the Web-Based Authentication Parameters

              Follow these steps to configure the maximum number of failed login attempts before the client is placed in a watch list for a waiting period:

              SUMMARY STEPS

                1.    enable

                2.    configure terminal

                3.    ip admission max-login-attempts number

                4.    end

                5.    show running-config

                6.    copy running-config startup-config


              DETAILED STEPS
                 Command or ActionPurpose
                Step 1 enable


                Example: 
                Switch> enable
                 

                Enables privileged EXEC mode. Enter your password if prompted.

                 
                Step 2configure terminal


                Example: 
                
Switch# configure terminal
                 

                Enters the global configuration mode.

                 
                Step 3ip admission max-login-attempts number


                Example: 
                
Switch(config)# ip admission max-login-attempts 10
                 

                Sets the maximum number of failed login attempts. The range is 1 to 2147483647 attempts. The default is 5.

                 
                Step 4end


                Example: 
                
Switch(config)# end
                 

                Returns to privileged EXEC mode.

                 
                Step 5show running-config


                Example: 
                
Switch# show running-config
                 

                Verifies your entries.

                 
                Step 6copy running-config startup-config


                Example: 
                Switch# copy running-config startup-config
                 

                (Optional) Saves your entries in the configuration file.

                 

                Configuring a Web-Based Authentication Local Banner

                Follow these steps to configure a local banner on a switch that has web authentication configured.

                SUMMARY STEPS

                  1.    enable

                  2.    configure terminal

                  3.    ip admission auth-proxy-banner http [banner-text | file-path]

                  4.    end

                  5.    show running-config

                  6.    copy running-config startup-config


                DETAILED STEPS
                   Command or ActionPurpose
                  Step 1 enable


                  Example: 
                  Switch> enable
                   

                  Enables privileged EXEC mode. Enter your password if prompted.

                   
                  Step 2configure terminal


                  Example: 
                  
Switch# configure terminal
                   

                  Enters the global configuration mode.

                   
                  Step 3ip admission auth-proxy-banner http [banner-text | file-path]


                  Example: 
                  
Switch(config)# ip admission auth-proxy-banner http C My Switch C
                   

                  Enables the local banner.

                  
(Optional) Create a custom banner by entering C banner-text C (where C is a delimiting character), or file-path that indicates a file (for example, a logo or text file) that appears in the banner.

                   
                  Step 4end


                  Example: 
                  
Switch(config)# end
                   

                  Returns to privileged EXEC mode.

                   
                  Step 5show running-config


                  Example: 
                  
Switch# show running-config
                   

                  Verifies your entries.

                   
                  Step 6copy running-config startup-config


                  Example: 
                  Switch# copy running-config startup-config
                   

                  (Optional) Saves your entries in the configuration file.

                   

                  Configuring Web-Based Authentication without SVI

                  You configure the web-based authentication without SVI feature to redirect the HTML login page to the client without creating an IP address in the routing table. These steps are optional.

                  SUMMARY STEPS

                    1.    enable

                    2.    configure terminal

                    3.    parameter-map type webauth global

                    4.    l2-webauth-enabled

                    5.    end

                    6.    show running-config

                    7.    copy running-config startup-config


                  DETAILED STEPS
                     Command or ActionPurpose
                    Step 1 enable


                    Example: 
                    Switch> enable
                     

                    Enables privileged EXEC mode. Enter your password if prompted.

                     
                    Step 2configure terminal


                    Example: 
                    
Switch# configure terminal
                     

                    Enters the global configuration mode.

                     
                    Step 3 parameter-map type webauth global


                    Example: 
                    Switch (config)# parameter-map type webauth global
                                          		Creates a parameter map and enters parameter-map webauth configuration mode. The specific configuration commands supported for a global parameter map defined with the global keyword differ from the commands supported for a named parameter map defined with the parameter-map-name argument.  
                    Step 4 l2-webauth-enabled


                    Example: 
                    Switch (config-params-parameter-map)# l2-webauth-enabled
                     

                    Enables the web-based authentication without SVI feature

                     
                    Step 5end


                    Example: 
                    
Switch(config)# end
                     

                    Returns to privileged EXEC mode.

                     
                    Step 6show running-config


                    Example: 
                    
Switch# show running-config
                     

                    Verifies your entries.

                     
                    Step 7copy running-config startup-config


                    Example: 
                    Switch# copy running-config startup-config
                     

                    (Optional) Saves your entries in the configuration file.

                     

                    Configuring Web-Based Authentication with VRF Aware

                    You configure the web-based authentication with VRF aware to redirect the HTML login page to the client. These steps are optional.

                    SUMMARY STEPS

                      1.    enable

                      2.    configure terminal

                      3.    parameter-map type webauth global

                      4.    webauth-vrf-aware

                      5.    end

                      6.    show running-config

                      7.    copy running-config startup-config


                    DETAILED STEPS
                       Command or ActionPurpose
                      Step 1 enable


                      Example: 
                      Switch> enable
                       

                      Enables privileged EXEC mode. Enter your password if prompted.

                       
                      Step 2configure terminal


                      Example: 
                      
Switch# configure terminal
                       

                      Enters the global configuration mode.

                       
                      Step 3 parameter-map type webauth global


                      Example: 
                      Switch (config)# parameter-map type webauth global
                                              		Creates a parameter map and enters parameter-map webauth configuration mode. The specific configuration commands supported for a global parameter map defined with the global keyword differ from the commands supported for a named parameter map defined with the parameter-map-name argument.  
                      Step 4 webauth-vrf-aware


                      Example: 
                      Switch (config-params-parameter-map)# webauth-vrf-aware
                       

                      Enables the web-based authentication VRF aware feature on SVI.

                       
                      Step 5end


                      Example: 
                      
Switch(config)# end
                       

                      Returns to privileged EXEC mode.

                       
                      Step 6show running-config


                      Example: 
                      
Switch# show running-config
                       

                      Verifies your entries.

                       
                      Step 7copy running-config startup-config


                      Example: 
                      Switch# copy running-config startup-config
                       

                      (Optional) Saves your entries in the configuration file.

                       

                      Removing Web-Based Authentication Cache Entries

                      Follow these steps to remove web-based authentication cache entries:

                      SUMMARY STEPS

                        1.    enable

                        2.    clear ip auth-proxy cache {* | host ip address}

                        3.    clear ip admission cache {* | host ip address}


                      DETAILED STEPS
                         Command or ActionPurpose
                        Step 1 enable


                        Example: 
                        Switch> enable
                         

                        Enables privileged EXEC mode. Enter your password if prompted.

                         
                        Step 2clear ip auth-proxy cache {* | host ip address}


                        Example: 
                        
Switch# clear ip auth-proxy cache 192.168.4.5
                         

                        Delete authentication proxy entries. Use an asterisk to delete all cache entries. Enter a specific IP address to delete the entry for a single host.

                         
                        Step 3clear ip admission cache {* | host ip address}


                        Example: 
                        
Switch# clear ip admission cache 192.168.4.5
                         

                        Delete authentication proxy entries. Use an asterisk to delete all cache entries. Enter a specific IP address to delete the entry for a single host.

                         

                        Monitoring Web-Based Authentication Status

                        Use the commands in this topic to display the web-based authentication settings for all interfaces or for specific ports.

                        Table 2 Privileged EXEC show Commands

                        Command

                        Purpose

                        show authentication sessions method webauth

                        Displays the web-based authentication settings for all interfaces for fastethernet, gigabitethernet, or tengigabitethernet

                        show wireless client mac-address a.a.a detail

                        Displays the session specific wireless information and wireless states.

                        show authentication sessions 
interface type slot/port[details]

                        Displays the web-based authentication settings for the specified interface for fastethernet, gigabitethernet, or tengigabitethernet.

                        In Session Aware Networking mode, use the show access-session interface command.

                        Feature Information for Web-Based Authentication

                        Release Feature Information
                        Cisco IOS XE 3.2SE

                        This feature is introduced.

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