2.3. Exemption sites and whitelists

Certain situations require client-side or mutual authentication that might not be proxied appropriately, therefore you have to allow them to pass the firewall using a plug proxy. This situation arises most commonly in secure banking and online ordering sites that use HTTPS, or with dedicated client-server applications (such as WindowsUpdate). To maintain a list of such sites, use one of the following methods:

  • If the IP address of the affected servers is static, add them to a separate zone. For details, see Procedure 2.3.1, IP filtering using a zone.

  • Use a MatcherPolicy. Matcher policies can compare the IP address of the target server to a predefined list, and can be configured to behave differently if a match is found or not. Another example will use a domain-name-matcher policy to resolve domain names that have dynamic IPs, or change their addresses periodically (for example, they use DNS round-robin method). Matcher policies are a bit more resource intensive, but easier to use and maintain after the initial configuration. If nothing restricts it, use a matcher policy.

  • Use a DetectorService to select which service to start based on the traffic parameters. For details, see Section 6.7.2, Detector policies in Zorp Professional 7 Administrator Guide and Procedure 6.4.4, Creating a new DetectorService in Zorp Professional 7 Administrator Guide.

More sophisticated configurations using both types of whitelisting can be also implemented based on the following examples.

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