DOKK / manpages / debian 11 / shorewall / shorewall-blrules.5.en

Configuration Files

NAME

blrules - shorewall Blacklist file

SYNOPSIS

/etc/shorewall[6]/blrules

DESCRIPTION

This file is used to perform blacklisting and whitelisting.

Rules in this file are applied depending on the setting of BLACKLIST in shorewall.conf[1](5).

The format of rules in this file is the same as the format of rules in shorewall-rules (5)[2]. The difference in the two files lies in the ACTION (first) column.

ACTION- {ACCEPT|BLACKLIST|blacklog|CONTINUE|DROP|A_DROP|REJECT|A_REJECT|WHITELIST|LOG|QUEUE|NFQUEUE[(queuenumber)]|[?]COMMENT|action|macro[(target)]}[:{log-level|none}[!][:tag]]

Specifies the action to be taken if the packet matches the rule. Must be one of the following.

BLACKLIST

Added in Shorewall 4.5.3. This is actually a macro that expands as follows:

•If BLACKLIST_LOGLEVEL is specified in shorewall.conf[1](5), then the macro expands to blacklog.

•Otherwise it expands to the action specified for BLACKLIST_DISPOSITION in shorewall.conf[1](5).

blacklog

May only be used if BLACKLIST_LOGLEVEL is specified in shorewall.conf[1](5). Logs, audits (if specified) and applies the BLACKLIST_DISPOSITION specified in shorewall.conf[1] (5).

ACCEPT|CONTINUE|WHITELIST

Exempt the packet from the remaining rules in this file.

DROP

Ignore the packet.

A_DROP

Audited version of DROP. Requires AUDIT_TARGET support in the kernel and ip6tables.

REJECT

disallow the packet and return an icmp-unreachable or an RST packet.

A_REJECT

Audited versions of REJECT. Require AUDIT_TARGET support in the kernel and ip6tables.

LOG

Simply log the packet and continue with the next rule.

QUEUE

Queue the packet to a user-space application such as ftwall (http://p2pwall.sf.net). The application may reinsert the packet for further processing.

NFLOG[(nflog-parameters)]

queues matching packets to a back end logging daemon via a netlink socket then continues to the next rule. See shorewall-logging(5)[3].

NFQUEUE

Queues the packet to a user-space application using the nfnetlink_queue mechanism. If a queuenumber is not specified, queue zero (0) is assumed.

?COMMENT

The rest of the line will be attached as a comment to the Netfilter rule(s) generated by the following entries. The comment will appear delimited by "/* ... */" in the output of "shorewall show <chain>". To stop the comment from being attached to further rules, simply include ?COMMENT on a line by itself.

action

The name of an action declared in shorewall-actions[4](5) or in /usr/share/shorewall/actions.std.

macro

The name of a macro defined in a file named macro.macro. If the macro accepts an action parameter (Look at the macro source to see if it has PARAM in the TARGET column) then the macro name is followed by the parenthesized target (ACCEPT, DROP, REJECT, ...) to be substituted for the parameter.

Example: FTP(ACCEPT).

The ACTION may optionally be followed by ":" and a syslog log level (e.g, REJECT:info or Web(ACCEPT):debug). This causes the packet to be logged at the specified level.

If the ACTION names an action declared in shorewall-actions[4](5) or in /usr/share/shorewall/actions.std then:

•If the log level is followed by "!' then all rules in the action are logged at the log level.

•If the log level is not followed by "!" then only those rules in the action that do not specify logging are logged at the specified level.

•The special log level none! suppresses logging by the action.

You may also specify NFLOG (must be in upper case) as a log level.This will log to the NFLOG target for routing to a separate log through use of ulogd (shorewall-logging.htm[3]).

Actions specifying logging may be followed by a log tag (a string of alphanumeric characters) which is appended to the string generated by the LOGPREFIX (in shorewall.conf[1](5)).

For the remaining columns, see shorewall-rules (5)[2].

EXAMPLES

IPv4 Example 1:

Drop 6to4 packets from the net.

DROP          net:192.88.99.1            all

IPv4 Example 2:

Don't subject packets from 70.90.191.120/29 to the remaining rules in the file.

WHITELIST     net:70.90.191.120/29       all

IPv6 Example 1:

Drop Teredo packets from the net.

DROP          net:[2001::/32]            all

IPv6 Example 2:

Don't subject packets from 2001:DB8::/64 to the remaining rules in the file.

WHITELIST     net:[2001:DB8::/64]        all

FILES

/etc/shorewall/blrules

/etc/shorewall6/blrules

NOTES

1.: shorewall.conf

http://www.shorewall.org/manpages/shorewall.conf.html

2.: shorewall-rules (5)

http://www.shorewall.org/manpages/shorewall-rules.html

3.: shorewall-logging(5)

http://www.shorewall.orgshorewall-logging.html

4.: shorewall-actions

http://www.shorewall.org/manpages/shorewall-actions.html

5.: http://www.shorewall.net/blacklisting_support.htm

http://www.shorewall.org/blacklisting_support.htm

6.: http://www.shorewall.net/configuration_file_basics.htm#Pairs

http://www.shorewall.org/configuration_file_basics.htm#Pairs

04/11/2019