PAC File Guidelines (Panorama)

• Note that if you are using the GlobalProtect Agent in Proxy Mode, the agent will distribute the PAC file to your hosts. The agent accesses the PAC file over HTTPS. The PAC file is public.
• PAC files steer user traffic to Explicit Proxy.
• You can only host one PAC file for use with Prisma Access, and the Explicit Proxy PAC file is hosted in the United States. If you require alternative PAC file access outside of the United States, you can host the PAC file in your enterprise.
• To access the PAC file, ensure that your endpoints can reach the following IP addresses:
  • 34.111.7.85
  • 34.160.172.204
  • 34.110.206.116
  • 34.95.107.244
  • 34.149.8.36
• Only ASCII text format is supported for PAC files. Palo Alto Networks recommends that you create and save the PAC file in a text editor such as VI or Vim.
• Upload the PAC file after you create your Explicit Proxy configuration and commit and push your changes. After you upload your PAC file, a commit and push operation is not required.
• You must have at least one Explicit Proxy URL in the return"PROXY foo.proxy.prismaaccess.com:8080"; statement beginning for traffic ingressing to Prisma Access. Either use a configured domain used when you push your changes or use a valid IPv4 address or DIRECT keyword such as PROXY paloaltonetworks-245139.proxy.prismaaccess.com:8080 or PROXY 1.2.3.4:8080, and so on.
• If the proxy is not being bypassed, then the you must provide a PROXY keyword. A valid proxy statement is required if no DIRECT keyword is configured for the proxy bypass.
• If a valid PROXY statement is found before an invalid PROXY statement, Explicit Proxy skips the validity check all on all PROXY statements after the first. For example, a PAC file with the valid statement PROXY paloaltonetworks-245139.proxy.prismaaccess.com:8080 followed by the invalid statement PROXY foo.proxy.prismaacess.com:8080 would be considered valid since Explicit Proxy skips the validity check for foo.proxy.prismaacess.com:8080.
• If you are using a PROXY statement to have ACS traffic bypass the Prisma Access proxy, the PROXY statement should not use the Explicit Proxy URL. In this configuration, Explicit Proxy provides an error message, but allows you to upload the PAC file. You can direct the ACS traffic to other proxies using a valid FQDN or IPv4 address, or directly to the internet, using the DIRECT keyword.
• Only IPv4 addresses are supported in PROXY statements. Do not use IPv6 addresses in PROXY statements.
• The maximum file size for a PAC file is 256 KB.
• If ACS/IdP traffic needs to go through Explicit Proxy, then add those domains to an auth bypass list and a No Decryption policy rule.
• If you set up Explicit Proxy in a default route environment, you must exclude the portal, gateway, and SAML FQDNs. You can use the PAC file to bypass the FQDNs.
• You cannot delete a PAC file after you're uploaded it. You can, however, upload a new PAC file to overwrite the existing one.
• If you change the Explicit Proxy URL in Prisma Access but do not change the PAC file to reflect the change, the change won't be applied. You must upload a new PAC file specifying the new Explicit Proxy URL.

function FindProxyForURL(url, host) { 
    /* Bypass localhost and Private IPs */ 
    var resolved_ip = dnsResolve(host); 
    if (isPlainHostName(host) || 
    shExpMatch(host, "*.local") || 
    isInNet(resolved_ip, "10.0.0.0", "255.0.0.0") || 
    isInNet(resolved_ip, "172.16.0.0",  "255.240.0.0") || 
    isInNet(resolved_ip, "192.168.0.0",  "255.255.0.0") || 
    isInNet(resolved_ip, "127.0.0.0", "255.255.255.0")) 
    return "DIRECT"; 
    /* Bypass FTP */ 
    if (url.substring(0,4) == "ftp:") 
        return "DIRECT"; 
    /* Bypass SAML, e.g. Okta */ 
    if (shExpMatch(host, "*.okta.com") || shExpMatch(host, "*.oktacdn.com")) 
        return "DIRECT"; 
        /* Bypass ACS */ 
    if (shExpMatch(host, "*.acs.prismaaccess.com")) 
        return "DIRECT"; 
    /* Forward to Prisma Access */ 
    return "PROXY foo.proxy.prismaaccess.com:8080";

var resolved_ip = dnsResolve(host); 

...

return "DIRECT";

if (url.substring(0,4) == "ftp:") 
return "DIRECT"; 

if (shExpMatch(host, "*.okta.com") || shExpMatch(host, "*.oktacdn.com")) 
return "DIRECT"; 

if (shExpMatch(host, "*.acs.prismaaccess.com")) 
return "DIRECT"; 

return "PROXY foo.proxy.prismaaccess.com:8080"