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    Configure Authentication for Explicit Web Proxy
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    5. Configure Authentication for Explicit Web Proxy
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    Configure Authentication for Explicit Web Proxy

    Table of Contents

    Configure Authentication for Explicit Web Proxy

    Configure Kerberos Authentication

    1. Create a service account for the directory (if it is not already configured) and enable support for AES128 and AES256 encryption in the service account properties.
    2. Register the service principal name (SPN) for the proxy FQDN and create a keytab file for the Kerberos single sign-on (SSO).
      The Kerberos keytab principal name must match the hostname that resolves to the proxy interface IP address.
    3. On the firewall, create a server profile for the Kerberos server.
    4. Configure an authentication profile to use Kerberos and import the keytab to the authentication profile.
    5. (Optional but recommended) If you use Panorama to manage your firewalls, configure a log forwarding profile to forward logs to Cortex Data Lake (CDL), Panorama, or both.
      By default, the firewall does not forward logs to CDL or Panorama. Forwarding the logs ensures that the complete authentication log information is available to assist in troubleshooting any potential authentication issues.
      As a best practice, if you are using Panorama to manage the web proxy firewall, configure any objects the proxy uses in a shared Panorama location and configure the web proxy firewall in a separate device group that contains no other firewalls or virtual systems. If the firewall is already a member of a device group, create a child device group as a sub-group and move the firewall to the child device group.
      If you experience issues with the browser challenge when using the Chrome browser, we recommend using an alternate browser.
    6. In the
      Explicit Proxy Configuration
       (
      Network
      Proxy
      Explicit Proxy Configuration
      ), select
      Kerberos Single Sign On
       as the
      Authentication service type
      .
    7. (Optional but recommended) If you are using a decryption policy for the traffic, select
      Strip ALPN
       to remove the value in the Application-Layer Protocol Negotiation (ALPN).
      This option requires HTTPS.
    8. Select the
      Authentication Profile
       you created in Step 4.
    9. Complete the remaining steps to Configure a Web Proxy.

    Configure SAML Authentication

    SAML authentication for explicit web proxy requires Panorama and the Cloud Services plugin version 3.2.1 (and later versions).
    To simplify configuration for SAML-based authentication for the explicit web proxy, the firewall or Panorama automatically generates the following rules to allow the necessary traffic. If you are using Panorama, you must select an individual firewall to view the rules.
    • SWG-allow-vpc-dns-rule
       — Allows traffic from the zone where the web proxy upstream interface is located to the primary and secondary DNS server addresses for the web proxy.
      The firewall also generates an anti-spyware profile,
      SWG-DNS-Security-Profile
      , to allow the required traffic.
      The autogenerated rule
      SWG-allow-vpc-dns-rule
       applies this profile to the applicable traffic.
    • SWG-block-unsolicited-dns-rule
       —Blocks unauthorized traffic to the primary and secondary DNS server addresses for the web proxy.
    • SWG-allow-outbound-auth-domain-rule
       — (Explicit proxy with SAML authentication only) Allows traffic from the zone where the web proxy upstream interface is located to the Cloud Services plugin.
      The autogenerated rule
      SWG-allow-outbound-auth-domain-rule
       applies the
      hybrid-swg-authdomain-bypass
       URL category to the applicable traffic.
      The URL category,
      hybrid-swg-authdomain-bypass
       contains the necessary predefined entries for the required domains.
    1. If you have not already done so, configure Explicit Proxy for mobile users.
      This is a typical authentication method for on-premises web proxy authentication and Prisma Access Explicit Proxy, which requires a license. Prisma Access Explicit Proxy settings for cookie and timeout values apply to an explicit web proxy configuration as well. You must commit the changes and push them to the relevant firewalls before continuing.
    2. If you have not already done so, configure a SAML Authentication profile.
    3. (
      Required for XAU only
      ) If the downstream proxy sends the XAU header, configure a trusted source address for the downstream proxy.
      1. Select
        Device
        User Identification
        Trusted Source Address
        .
      2. Edit
         the settings for the trusted source address to change the status to
        Enabled
        .
      3. Add
         any address objects you want to allow X-Authenticated User (XAU).
        Explicit web proxy requires an IP address object for the trusted source address.
      4. Click
        OK
        .
    4. In the
      Explicit Proxy Configuration
       (
      Network
      Proxy
      Explicit Proxy Configuration
      ), select
      SAML/CAS
       as the
      Authentication service type
      .
    5. (Optional but recommended) If you are using a decryption policy for the traffic, select
      Strip ALPN
       to remove the value in the Application-Layer Protocol Negotiation (ALPN).
      This option requires HTTPS.
    6. Complete the remaining steps to configure the Configure a Web Proxy.

    Configure Cloud Identity Engine Authentication

    To simplify configuration for SAML-based authentication for the explicit web proxy, the firewall or Panorama automatically generates the following rules to allow the necessary traffic. If you are using Panorama, you must select an individual firewall to view the rules.
    • SWG-allow-vpc-dns-rule
       — Allows traffic from the zone where the web proxy upstream interface is located to the primary and secondary DNS server addresses for the web proxy.
      The firewall also generates an anti-spyware profile,
      SWG-DNS-Security-Profile
      , to allow the required traffic.
      The autogenerated rule
      SWG-allow-vpc-dns-rule
       applies this profile to the applicable traffic.
    • SWG-block-unsolicited-dns-rule
       —Blocks unauthorized traffic to the primary and secondary DNS server addresses for the web proxy.
    • SWG-allow-outbound-auth-domain-rule
       — (Explicit proxy with SAML authentication only) Allows traffic from the zone where the web proxy upstream interface is located to the Cloud Services plugin.
      The autogenerated rule
      SWG-allow-outbound-auth-domain-rule
       applies the
      hybrid-swg-authdomain-bypass
       URL category to the applicable traffic.
      The URL category,
      hybrid-swg-authdomain-bypass
       contains the necessary predefined entries for the required domains.
    1. If you have not already done so, configure Explicit Proxy for mobile users.
      You must commit the changes and push them to the relevant firewalls before continuing.
    2. If you have not already done so, configure authentication using the Cloud Identity Engine and configure a Cloud Identity Engine authentication profile.
    3. (
      Required for XAU only
      ) If the downstream proxy sends the XAU header, configure a trusted source address for the downstream proxy.
      1. Select
        Device
        User Identification
        Trusted Source Address
        .
      2. Edit
         the settings for the trusted source address to change the status to
        Enabled
        .
      3. Add
         any address objects you want to allow X-Authenticated User (XAU).
        Explicit web proxy requires an IP address object for the trusted source address.
      4. Click
        OK
        .
    4. In the
      Explicit Proxy Configuration
       (
      Network
      Proxy
      Explicit Proxy Configuration
      ), select
      SAML/CAS
       as the
      Authentication service type
      .
    5. (Optional but recommended) Select
      Strip ALPN
       to remove the value in the Application-Layer Protocol Negotiation (ALPN).
      This option requires HTTPS.
    6. Complete the remaining steps to configure the Configure a Web Proxy.

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