Configure Multi-Factor Authentication

To use Multi-Factor Authentication (MFA) for protecting sensitive services and applications, you must configure Captive Portal to display a web form for the first authentication factor and to record Authentication Timestamps. The firewall uses the timestamps to evaluate the timeouts for Authentication Policy rules. To enable additional authentication factors, you can integrate the firewall with MFA vendors through RADIUS or vendor APIs. After evaluating Authentication policy, the firewall evaluates Security policy, so you must configure rules for both policy types.
Palo Alto Networks provides support for MFA vendor API integrations through Applications or Applications and Threats content updates. This means that if you use Panorama to push device group configurations to firewalls, you must install the same Applications updates on the firewalls as on Panorama to avoid mismatches in vendor support.
MFA vendor API integrations are supported for end-user authentication through Authentication Policy only. For remote user authentication to GlobalProtect portals or gateways or for administrator authentication to the PAN-OS or Panorama web interface, you can only use MFA vendors supported through RADIUS or SAML; MFA services through vendor APIs are not supported in these use cases.
  1. Configure Captive Portal in
    Redirect
    mode to display a web form for the first authentication factor, to record authentication timestamps, and to update user mappings.
  2. Configure one of the following server profiles to define how the firewall will connect to the service that authenticates users for the first authentication factor.
    In most cases, an external service is recommended for the first authentication factor. However, you can configure Configure Local Database Authentication as an alternative.
  3. Add an MFA server profile.
    The profile defines how the firewall connects to the MFA server. Add a separate profile for each authentication factor after the first factor. The firewall integrates with these MFA servers through vendor APIs. You can specify up to three additional factors. Each MFA vendor provides one factor, though some vendors let users choose one factor out of several.
    1. Select
      Device
      Server Profiles
      Multi Factor Authentication
      and
      Add
      a profile.
    2. Enter a
      Name
      to identify the MFA server.
    3. Select the
      Certificate Profile
      that the firewall will use to validate the MFA server certificate when establishing a secure connection to the MFA server.
    4. Select the
      MFA Vendor
      you deployed.
    5. Configure the
      Value
      of each vendor attribute.
      The attributes define how the firewall connects to the MFA server. Each vendor
      Type
      requires different attributes and values; refer to your vendor documentation for details.
    6. Click
      OK
      to save the profile.
  4. Configure an authentication profile.
    The profile defines the order of the authentication factors that users must respond to.
    1. Select
      Device
      Authentication Profile
      and
      Add
      a profile.
    2. Enter a
      Name
      to identify the authentication profile.
    3. Select the
      Type
      for the first authentication factor and select the corresponding
      Server Profile
      .
    4. Select
      Factors
      ,
      Enable Additional Authentication Factors
      , and
      Add
      the MFA server profiles you configured.
      The firewall will invoke each MFA service in the listed order, from top to bottom.
    5. Click
      OK
      to save the authentication profile.
  5. The object associates each authentication profile with a Captive Portal method. The method determines whether the first authentication challenge (factor) is transparent or requires a user response.
    Select the
    Authentication Profile
    you configured and enter a
    Message
    that tells users how to authenticate for the first factor. The message displays in the Captive Portal web form.
    If you set the
    Authentication Method
    to
    browser-challenge
    , the Captive Portal web form displays only if Kerberos SSO authentication fails. Otherwise, authentication for the first factor is automatic; users won’t see the web form.
  6. The rule must match the services and applications you want to protect and the users who must authenticate.
    1. Select
      Policies
      Authentication
      and
      Add
      a rule.
    2. Enter a
      Name
      to identify the rule.
    3. Select
      Source
      and
      Add
      specific zones and IP addresses or select
      Any
      zones or IP addresses.
      The rule applies only to traffic coming from the specified IP addresses or from interfaces in the specified zones.
    4. Select
      User
      and select or
      Add
      the source users and user groups to which the rule applies (default is
      any
      ).
    5. Select
      Destination
      and
      Add
      specific zones and IP addresses or select
      any
      zones or IP addresses.
      The IP addresses can be resources (such as servers) for which you want to control access.
    6. Select
      Service/URL Category
      and select or
      Add
      the services and service groups for which the rule controls access (default is
      service-http
      ).
    7. Select or
      Add
      the URL Categories for which the rule controls access (default is
      any
      ). For example, you can create a custom URL category that specifies your most sensitive internal sites.
    8. Select
      Actions
      and select the
      Authentication Enforcement
      object you created.
    9. Specify the
      Timeout
      period in minutes (default 60) during which the firewall prompts the user to authenticate only once for repeated access to services and applications.
    10. Click
      OK
      to save the rule.
  7. Customize the MFA login page.
    The firewall displays this page to tell users how to authenticate for MFA factors and to indicate the authentication status (in progress, succeeded, or failed).
    1. Select
      Device
      Response Pages
      and select
      MFA Login Page
      .
    2. Select the
      Predefined
      response page and
      Export
      the page to your client system.
    3. On your client system, use an HTML editor to customize the downloaded response page and save it with a unique filename.
    4. Return to the MFA Login Page dialog on the firewall,
      Import
      your customized page,
      Browse
      to select the
      Import File
      , select the
      Destination
      (virtual system or
      shared
      location), click
      OK
      , and click
      Close
      .
  8. Configure a Security policy rule that allows users to access the services and applications that require authentication.
    1. Commit
      your changes.
      The automated correlation engine on the firewall uses several correlation objects to detect events on your network that could indicate credential abuse relating to MFA. To review the events, select
      Monitor
      Automated Correlation Engine
      Correlated Events
      .
  9. Verify that the firewall enforces MFA.
    1. Log in to your network as one of the source users specified in the Authentication rule.
    2. Request a service or application that matches one of the services or applications specified in the rule.
      The firewall displays the Captive Portal web form for the first authentication factor. The page contains the message you entered in the authentication enforcement object. For example:
      captive_portal_login_mfa.png
    3. Enter your user credentials for the first authentication challenge.
      The firewall then displays an MFA login page for the next authentication factor. For example, the MFA service might prompt you to select the Voice, SMS, push, or PIN code (OTP) authentication method. If you select push, your phone prompts you to approve the authentication.
      mfa_login_user-select-method.png
    4. Authenticate for the next factor.
      The firewall displays an authentication success or failure message. If authentication succeeded, the firewall displays an MFA login page for the next authentication factor, if any.
      Repeat this step for each MFA factor. After you authenticate for all the factors, the firewall evaluates Security policy to determine whether to allow access to the service or application.
    5. End the session for the service or application you just accessed.
    6. Start a new session for the same service or application. Be sure to perform this step within the
      Timeout
      period you configured in the Authentication rule.
      The firewall allows access without re-authenticating.
    7. Wait until the
      Timeout
      period expires and request the same service or application.
      The firewall prompts you to re-authenticate.

Related Documentation