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    Configure Explicit Proxy
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    Configure Explicit Proxy

    Table of Contents

    Configure Explicit Proxy

    Where Can I Use This?
    What Do I Need?
    • NGFW (Cloud Managed)
    • NGFW (PAN-OS or Panorama Managed)
    • Web proxy license
    • (For cloud-managed NGFW)
      AIOps for NGFW Premium
       license.
    An explicit proxy is one of the types of web proxy that you can configure on your firewalls. The web proxy enables you to leverage the same capabilities of a proxy device while providing a simple, unified interface from which to manage the proxy.
    The explicit proxy method in particular allows you to troubleshoot issues more easily, since the client browser is aware of the existence of the proxy.

    PAN-OS

    1. (
      VM Series only
      ) If you have not already done so, activate the license for web proxy.
      You must activate the web proxy license for the PA-1400 Series, PA-3400 Series, and VM-Series. Learn how to activate your subscription licenses for the PA-1400 Series and PA-3400 Series or activate the web proxy license for the VM-Series in the following step.
      1. Log in to the Customer Service Portal (CSP).
      3. Select
        Web Proxy (Promotional Offer)
        .
      4. Click
        Update Deployment Profile
        .
      5. On the firewall, retrieve the license keys from the server.
        If the license key retrieval is not successful, restart the firewall and repeat this step before proceeding.
    2. Set up the necessary interfaces and zones.
      As a best practice, use Layer 3 (L3) for the three interfaces the web proxy uses and configure a separate zone for each interface within the same virtual routers and the same virtual systems.
      1. Configure an interface for the client traffic.
        Be sure to carefully copy the IP address for this interface and save it in a secure location because you must enter it as the
        Proxy IP
         address when you configure the web proxy.
      2. Configure an interface for the outgoing traffic to the internet.
      3. Configure a loopback interface for the proxy.
        All incoming traffic is routed through this interface to the proxy.
    3. Set up the DNS proxy for Explicit Proxy.
      1. Configure a DNS proxy object for the proxy connection.
      2. Configure a DNS Server profile with both primary and secondary DNS servers.
        You must configure both a primary and a secondary DNS server for web proxy.
      3. Specify the interface for the proxy connection.
        Specify either the traffic ingress interface or a loopback interface.
    4. To enable decryption for MITM detection, create a self-signed root CA certificate or import a certificate signed by your enterprise certificate authority (CA). For more information, refer to the best practices for administrative access.
    5. Ensure you have completed the pre-deployment steps for the authentication method you want to configure.
    6. If you have a DNS security subscription, integrate the web proxy firewall with Explicit Proxy to sinkhole any requests that match the DNS security categories that you specify.
      1. Select
        Panorama
        Cloud Services
        Configuration
        On-Prem Proxy
        .
      2. Edit
         the settings then select the
        Device Group
         you want the web proxy firewall to use or
        Add
         a new device group.
        To integrate the web proxy firewall with Prisma Access, you must 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.
      3. (Optional) Select
        Block Settings
         to
        Add
         a
        Blocked Domain
         or any domains that are
        Exempted Domains
         because they are sinkholed due to matching one or more of the DNS Security categories.
      4. (Optional) Select whether you want to
        Log any requests made to blocked domains
        .
      5. Click
        OK
        .
    7. Set up the Explicit Proxy.
      1. On the firewall, select
        Network
        Proxy
         then
        Edit
         the
        Proxy Enablement
         settings.
      2. Select
        Explicit Proxy
         as the
        Proxy Type
         then click
        OK
         to confirm the changes.
        If the only available option is None, verify that you have an active license for the web proxy feature.
      3. Edit
         the
        Explicit Proxy Configuration
        .
      4. Specify the
        Connect Timeout
         to define (in seconds) how long the proxy waits for a response from the web server. If there is no response after the specified amount of time has elapsed, the proxy closes the connection.
      5. Select the
        Listening Interface
         that contains the firewall where you want to enable the web proxy.
        Specify the ingress interface for the client traffic.
      6. Select the
        Upstream Interface
         that contains the interface with the web proxy that reroutes the traffic to the server.
        If you are using a loopback interface, specify that interface as the
        Upstream Interface
        .
      7. Specify the IP address of the listening interface as the
        Proxy IP
        .
        Enter the IP address of the interface you created in an earlier step.
      8. Specify the
        DNS Proxy
         object you created in an earlier step.
      9. Select
        Check domain in CONNECT & SNI are the same
         to prevent domain fronting attacks by specifying different domains between the CONNECT request and the Server Name Indication (SNI) field in the HTTP header.
      10. Select the
        Authentication service type
         you want to use (either
        SAML/CAS
        or
        Kerberos Single Sign On
        ).
        Be sure to complete all necessary pre-deployment and configuration steps for the authentication method you select. Select only one of the following authentication methods:
      11. Click
        OK
         to confirm the changes.
    8. Configure the necessary security policy rules to decrypt traffic and reroute applicable traffic to the proxy.
      You will need to create the following types of rules:
      • Source NAT (if applicable)
      • Decryption
      • Security
      1. Configure a decryption policy to decrypt the traffic so it can be rerouted if necessary.
        To avoid decrypting traffic twice, select the zone that contains the upstream interface as the source zone for the decryption policy.
      2. (Optional but recommended) Select
        Objects
        Decryption Profile
         and select
        Block sessions on SNI mismatch with Server Certificate (SAN/CN)
         to automatically deny any sessions where the Server Name Indication (SNI) does not match the server certificate.
      3. Configure the necessary security policy rules.
        • Create a security policy rule to allow traffic from the client to the interface you selected as the listening interface.
        • Configure a security policy rule to allow traffic from the zone that contains the upstream interface to the internet.
        • Configure a security policy rule to allow traffic from the DNS proxy zone to the internet.
      4. Configure a security policy rule using the authentication profile you configured in an earlier step to route traffic to the proxy as appropriate.
      5. If this is your initial transparent web proxy configuration, make a change in your proxy configuration (
        Network
        DNS Proxy
        ) and in your interface configuration (
        Network
        Interfaces
        ), then
        Commit
         your changes to ensure the transparent web proxy configuration is correctly populated on the firewall.

    Cloud Management

    Explicit Web Proxy for
    Strata Cloud Manager
     is supported only with the legacy router stack. If you'd like this enabled, please reach out to your account team.
    You can configure an explicit web proxy on cloud-managed firewalls using
    Strata Cloud Manager
    .
    1. (
      VM Series only
      ) If you have not already done so, activate the license for web proxy.
      You must activate the web proxy license for the PA-1400 Series, PA-3400 Series, and VM-Series. Learn how to activate your subscription licenses for the PA-1400 Series and PA-3400 Series or activate the web proxy license for the VM-Series in the following step.
      1. Log in to the Customer Service Portal (CSP).
      3. Select
        Web Proxy (Promotional Offer)
        .
      4. Click
        Update Deployment Profile
        .
      5. On the firewall, retrieve the license keys from the server.
        If the license key retrieval is not successful, restart the firewall and repeat this step before proceeding.
    2. Set up the necessary interfaces and zones.
      As a best practice, use Layer 3 (L3) for the three interfaces the web proxy uses and configure a separate zone for each interface within the same virtual routers and the same virtual systems.
      1. Configure an interface for the client traffic.
        Be sure to carefully copy the IP address for this interface and save it in a secure location because you must enter it as the
        Proxy IP
         address when you configure the web proxy.
      2. Configure an interface for the outgoing traffic to the internet.
      3. (
        Optional
        ) Configure a loopback interface for the proxy.
        Strata Cloud Manager
         automatically creates a loopback interface. Only configure one if you would like to use a different loopback interface.
        All incoming traffic is routed through this interface to the proxy.
    3. To enable decryption for MITM detection, create a self-signed root CA certificate or import a certificate signed by your enterprise certificate authority (CA). For more information, refer to the best practices for administrative access.
    4. Ensure you have completed the pre-deployment steps for the authentication method you want to configure.
    5. If you have a DNS security subscription, integrate the web proxy firewall with Explicit Proxy to sinkhole any requests that match the DNS security categories that you specify.
      1. In
        Strata Cloud Manager
        , select
        Manage
        Configuration
        NGFW and Prisma Access
        Device Settings
        Proxy
        Block Domains
        Customize
        .
      2. (Optional)
        Add
        Block Domain Categories
        ,
        Block Domain Lists
        , or any domains that are
        Exception Domains
         because they are sinkholed due to matching one or more of the DNS Security categories.
      3. (Optional)
         Select whether you want to
        Log blocked domain requests
        .
      4. Save
         your selections.
    6. Set up the Explicit Proxy.
      1. In
        Strata Cloud Manager
        , select
        Manage
        Configuration
        NGFW and Prisma Access
        Device Settings
        Configuration Scope
        .
      2. Select the folder or snippet for which you want to configure Explicit Proxy.
      3. Select
        Device Settings
        Proxy
        Proxy Settings
        Customize
        .
      4. Select
        Explicit Proxy
         as the
        Mode
        .
      5. Select the
        Authentication Method
         you want to use (either
        Kerberos Single Sign On
         or
        SAML/CAS
        ).
        Be sure to complete all necessary pre-deployment and configuration steps for the authentication method you select.
      6. If you selected
        Kerberos Single Sign On
        , specify the
        Authentication Profile
         that you created when configuring Kerberos.
      7. Specify the
        Client Facing Interface
        .
        This is the interface for client traffic that you configured in an earlier step.
      8. Specify an
        Outbound Zone
         for outgoing traffic to the internet.
        You can
        Create New
         if you don't already have an outbound zone configured.
      9. Specify the IP addresses for the primary and secondary DNS servers that you want to connect to.
      10. Specify the interface for the DNS proxy connection.
      11. (
        Optional
        ) Specify the
        Connect Timeout
         to define (in seconds) how long the proxy waits for a response from the web server. If there is no response after the specified amount of time has elapsed, the proxy closes the connection. The default is 5 seconds.
      12. (
        Optional
        ) Specify the
        Web Traffic Service Port
         if you'd like web traffic to use special ports. The default ports are 80 and 443.
      13. (
        Optional
        ) Specify the loopback interface for the proxy that you configured in an earlier step.
      14. (
        Optional
        ) In case of legitimate business need, deselect
        Reset if SNI does not match HTTP CONNECT
        .
        It's recommended to leave this enabled to prevent domain fronting attacks by specifying different domains between the CONNECT request and the Server Name Indication (SNI) field in the HTTP header.
      15. Select
        Save
         to confirm the changes.
    7. If it applies to your deployment, create a Source NAT policy rule.
    8. Customize web access policies for any exceptions to the default policies you may need.
    9. If this is your initial explicit web proxy configuration, make a change to your proxy auto-configuration (PAC) file.
      1. Select
        Manage
        Configuration
        NGFW and Prisma Access
        Device Settings
        Proxy
        Proxy Auto Configuration
      2. Follow the PAC file guidelines to make the necessary changes to the PAC file.
      3. When you're finished making changes,
        Save
         the file.
      The PAC file applies to all firewalls associated with your
      Strata Cloud Manager
       tenant. If you need different PAC files for different firewalls, you'll have to manually upload a different PAC file to those firewalls.

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