12.9.1. Configuring firewall rules

PASS

DENY

Firewall rule action:

• PASS: allow traffic

• DENY: deny traffic.

enabled

Enable/disable a rule:

• enabled(yes) or enabled(true).

• enabled(no) or enabled(false).

name

Firewall rule name.

Example: name("Rule example").

desc

A description of the rule.

Example: desc("Firewall rule example configured in CLI").

reject_with

This setting is available for rules with the DENY action:

• reject_with(no).

• reject_with("host_unreach"): block traffic and send the ICMP host unreachable message.

• reject_with("tcp_rst"): block traffic and send the TCP connection reset message.

  Important! If Send TCP reset is selected, you need to specify a service that uses the TCP protocol (for more details about how to add and configure services, see Configuring services).

• reject_with("tcp_reset-both"): block traffic and send the TCP connection reset message to both the client and the server.

scenario

Scenario that needs to be active for the rule to trigger.

To specify a scenario: scenario = "Example of a scenario".

For more details on configuring scenarios, see Configuring scenarios.

rule_log

Log traffic information if the rule is triggered. The available options are:

• rule_log(no) or rule_log(false): disable logging. If rule_log is not specified, logging is disabled.

• rule_log(yes) or rule_log(true): log all network packets without setting any limits. To set a limit, you need to specify the number of events to be logged per unit time (s: second; min: minute; h: hour; d: day; the minimum log limit is 5 packets per day) and the maximum number of packets logged per event. For example, rule_log(yes, "3/h", 5) enables logging with the following limits: 3 events per hour with a maximum number of packets per event of 5.

• rule_log(session): log the start of the section.

fragmented

Specify packets to which the firewall rule applies:

• fragmented(yes) or fragmented(true): apply the rule to fragmented packets only.

• fragmented(no) or fragmented(false): apply the rule to unfragmented packets only.

• fragmented(all): apply the rule to all packets.

If fragmented is not specified, the firewall rule is applied to all packets.

src.zone

Traffic source zone.

To specify a source zone, such as Trusted: src.zone = Trusted.

For more details about configuring zones using the CLI, see Zones.

src.ip

Add source IP address or domain lists.

Example for IP addresses: src.ip = lib.network(). Specify the list name in parentheses. For more details about how to create and configure IP address lists using CLI, see Configuring IP addresses.

Example for domains: src.ip = lib.url(). Specify the URL to which necessary domains were added in parentheses. For more details about how to create and configure URL lists using the CLI, see Configuring URL lists.

src.geoip

Source GeoIP. Specify a country code (for example, src.geoip = AE).

Click here for the list of ISO 3166-1 country codes.

Important! There is a limit on the number of GeoIPs that can be specified: the number cannot exceed 15.

user

Users and user groups for which the firewall rule applies (local or LDAP).

To add LDAP groups and users, you need to have a correctly configured LDAP connector (for more information about configuring LDAP connectors via the CLI, see Configuring LDAP connectors).

The following line describes how to add a local user (local_user) and group (Local Group), a user (example.local\AD_user), and an LDAP group (AD group):

user = (local_user, "CN=Local Group, DC=LOCAL", "example.loc\\AD_user", "CN=AD group, OU=Example, DC= example, DC=loc")

The Active Directory domain example.loc has been already configured. When adding LDAP users and groups, you can specify a list of paths on the server, starting from which the system will search for users and groups.

dst.zone

Traffic destination zone.

To specify a source zone, such as Untrusted: dst.zone = Untrusted.

For more details about configuring zones using the CLI, see Zones.

dst.ip

Add lists of destination IP addresses or domains.

To specify an IP address list: dst.ip = lib.network(). Specify the list name in parentheses. For more details about how to create and configure IP address lists using CLI, see Configuring IP addresses.

To specify a domain list: dst.ip = lib.url(). Specify the URL to which the necessary domains were added in parentheses. For more details about how to create and configure URL lists using the CLI, see Configuring URL lists.

dst.geoip

Destination GeoIP. Specify a country code (for example, dst.geoip = AE).

Click here for the list of ISO 3166-1 country codes.

Important! There is a limit on the number of GeoIPs that can be specified: the number cannot exceed 15.

service

Service type. You can specify a service or a services group (for more details, see Configuring services and Configuring service groups).

To specify a single service: service = "service name". To specify multiple services: service = (service-name1, service-name2, ...).

To specify a services group: service = lib.service(). Provide the services group name in parentheses.

application

List of applications to which this rule applies. You can specify:

• All application groups: application = lib.category(All).

• Application groups: application = lib.applicationgroup(). Provide the application group name in parentheses.

• Application categories: application = lib.category(). Provide the application category name in parentheses.

time

Set a schedule for a rule.

To set a schedule: time = lib.time(). Specify a time set group name in parentheses. For more details on configuring time sets, see Configuring time sets.