SHOREWALL6-CONNTRAC(5) | Configuration Files | SHOREWALL6-CONNTRAC(5) |
NAME¶
conntrack - shorewall6 conntrack fileSYNOPSIS¶
/etc/shorewall6/conntrack
DESCRIPTION¶
The original intent of the notrack file was to exempt certain traffic from Netfilter connection tracking. Traffic matching entries in the file were not to be tracked. The role of the file was expanded in Shorewall 4.4.27 to include all rules that can be added in the Netfilter raw table. In 4.5.7, the file's name was changed to conntrack. The file supports two different column layouts: FORMAT 1, FORMAT 2, and FORMAT 3, FORMAT 1 being the default. The three differ as follows:•in FORMAT 2 and 3, there is an additional leading
ACTION column.
•in FORMAT 3, the SOURCE column accepts no zone
name; rather the ACTION column allows a SUFFIX that determines the chain(s)
that the generated rule will be added to.
When an entry in the following form is encountered, the format of the following
entries are assumed to be of the specified format.
[?]FORMAT
format
where format is either 1,2 or 3.
Format 3 was introduced in Shorewall 4.5.10. The optional '?' was introduced in
Shorewall 4.5.11 and ?FORMAT is the preferred form; the form without the '?'
is deprecated.
Comments may be attached to Netfilter rules generated from entries in this file
through the use of COMMENT lines. These lines begin with the word COMMENT; the
remainder of the line is treated as a comment which is attached to subsequent
rules until another COMMENT line is found or until the end of the file is
reached. To stop adding comments to rules, use a line with only the word
COMMENT.
format
This column is only present when FORMAT >= 2. Values
other than NOTRACK require CT Targetsupport in your iptables and kernel.
SOURCE (formats 1 and 2) –
zone[:interface][:address-list]
•NOTRACK or CT:notrack
Disables connection tracking for this packet. If a log-level is
specified, the packet will also be logged at that level.
•helper:name
Attach the helper identified by the name to this connection. This is more
flexible than loading the conntrack helper with preset ports. If a
log-level is specified, the packet will also be logged at that level.
At this writing, the available helpers are:
amanda
Requires that the amanda netfilter helper is
present.
ftp
Requires that the FTP netfilter helper is present.
irc
Requires that the IRC netfilter helper is present.
netbios-ns
Requires that the netbios_ns (sic) helper is
present.
RAS and Q.931
These require that the H323 netfilter helper is
present.
pptp
Requires that the pptp netfilter helper is present.
sane
Requires that the SANE netfilter helper is present.
sip
Requires that the SIP netfilter helper is present.
snmp
Requires that the SNMP netfilter helper is present.
tftp
Requires that the TFTP netfilter helper is present.
May be followed by an option list of arg=val pairs in parentheses:
•ctevents=event[,...]
Only generate the specified conntrack events for this connection. Possible event
types are: new, related, destroy, reply,
assured, protoinfo, helper, mark (this is
connection mark, not packet mark), natseqinfo, and secmark. If
more than one event is listed, the event list must be enclosed
in parentheses (e.g., ctevents=(new,related)).
•expevents=new
Only generate a new expectation events for this connection.
•DROP
Added in Shorewall 4.5.10. Silently discard the packet. If a log-level is
specified, the packet will also be logged at that level.
•IP6TABLES(target)
Added in Shorewall 4.6.0. Allows you to specify any iptables target with
target options (e.g., "IP6TABLES(AUDIT --type drop)"). If the target
is not one recognized by Shorewall, the following error message will be
issued:
ERROR: Unknown target
( target)
This error message may be eliminated by adding target as a builtin action
in shorewall6-actions(5)[1].( target)
•LOG
Added in Shoreawll 4.6.0. Logs the packet using the specified log-level
and log-tag (if any). If no log-level is specified, then 'info' is
assumed.
•NFLOG
Added in Shoreawll 4.6.0. Queues the packet to a backend logging daemon using
the NFLOG netfilter target with the specified nflog-parameters.
When FORMAT = 1, this column is not present and the rule is processed as if
NOTRACK had been entered in this column.
Beginning with Shorewall 4.5.10, when FORMAT = 3, this column can end with a
colon followed by a chain-designator. The chain-designator can
be one of the following:
P
The rule is added to the raw table PREROUTING chain. This
is the default if no chain-designator is present.
O
The rule is added to the raw table OUTPUT chain.
PO or OP
The rule is added to the raw table PREROUTING and OUTPUT
chains.
where zone is the name of a zone, interface
is an interface to that zone, and address-list is a comma-separated
list of addresses (may contain exclusion - see shorewall6-exclusion[2]
(5)).
Beginning with Shorewall 4.5.7, all can be used as the zone name
to mean all zones.
Beginning with Shorewall 4.5.10, all- can be used as the zone name
to mean all off-firewall zones.
SOURCE (format 3) – {-|
interface[:address-list]|address-list}
Where interface is an interface to that zone, and
address-list is a comma-separated list of addresses (may contain
exclusion - see shorewall6-exclusion[2] (5)).
COMMENT is only allowed in format 1; the remainder of the line is treated as a
comment that will be associated with the generated rule(s).
DEST – {-| interface[:address-list]|address-list}
where address-list is a comma-separated list of
addresses (may contain exclusion - see shorewall6-exclusion[2]
(5)).
PROTO – protocol-name-or-number[,...]
A protocol name from /etc/protocols or a protocol number.
Beginning with Shorewall 4.5.12, this column can accept a comma-separated list
of protocols.
DEST PORT(S) (dport) - {-| port-number/service-name-list|+ipset}
A comma-separated list of port numbers and/or service
names from /etc/services. May also include port ranges of the form
low-port: high-port if your kernel and iptables include port
range support.
Beginning with Shorewall 4.6.0, an ipset name can be specified in this column.
This is intended to be used with bitmap:port ipsets.
SOURCE PORT(S) (sport) - {-| port-number/service-name-list|+ipset}
A comma-separated list of port numbers and/or service
names from /etc/services. May also include port ranges of the form
low-port: high-port if your kernel and iptables include port
range support.
Beginning with Shorewall 4.5.15, you may place '=' in this column, provided that
the DEST PORT(S) column is non-empty. This causes the rule to match when
either the source port or the destination port in a packet matches one of the
ports specified in DEST PORTS(S).
Beginning with Shorewall 4.6.0, an ipset name can be specified in this column.
This is intended to be used with bitmap:port ipsets.
USER/GROUP (user) – [ user][:group]
May only be specified if the SOURCE zone is $FW.
Specifies the effective user id and or group id of the process sending the
traffic.
SWITCH - [!]switch-name[={0|1}]
Added in Shorewall6 4.5.10 and allows enabling and
disabling the rule without requiring shorewall6 restart.
Enables the rule if the value stored in /proc/net/nf_condition/
switch-name is 1. Disables the rule if that file contains 0 (the
default). If '!' is supplied, the test is inverted such that the rule is
enabled if the file contains 0.
Within the switch-name, '@0' and '@{0}' are replaced by the name of the
chain to which the rule is a added. The switch-name (after '@...'
expansion) must begin with a letter and be composed of letters, decimal
digits, underscores or hyphens. Switch names must be 30 characters or less in
length.
Switches are normally off. To turn a switch on:
echo 1 >
/proc/net/nf_condition/switch-name
To turn it off again:
/proc/net/nf_condition/switch-name
echo 0 >
/proc/net/nf_condition/switch-name
Switch settings are retained over shorewall6 restart.
When the switch-name is followed by =0 or =1, then the
switch is initialized to off or on respectively by the start command.
Other commands do not affect the switch setting./proc/net/nf_condition/switch-name
EXAMPLES¶
Example 1: Use the FTP helper for TCP port 21 connections from the firewall itself.FORMAT 2 #ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP # PORT(S) PORT(S) CT:helper:ftp(expevents=new) fw - tcp 21
FORMAT 2 #ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP # PORT(S) PORT(S) DROP all-:2001:1.2.3::4 - DROP all 2001:1.2.3::4
FORMAT 3 #ACTION SOURCE DEST PROTO DEST SOURCE USER/GROUP # PORT(S) PORT(S) DROP:P 2001:1.2.3::4 - DROP:PO - 2001:1.2.3::4
FILES¶
/etc/shorewall6/notrackSEE ALSO¶
http://www.shorewall.net/configuration_file_basics.htm#Pairs[3] shorewall6(8), shorewall6-accounting(5), shorewall6-actions(5), shorewall6-blacklist(5), shorewall6-hosts(5), shorewall6-interfaces(5), shorewall6-ipsec(5), shorewall6-netmap(5),shorewall6-params(5), shorewall6-policy(5), shorewall6-providers(5), shorewall6-proxyarp(5), shorewall6-rtrules(5), shorewall6-routestopped(5), shorewall6-rules(5), shorewall6.conf(5), shorewall6-secmarks(5), shorewall6-tcclasses(5), shorewall6-tcdevices(5), shorewall6-mangle(5), shorewall6-tos(5), shorewall6-tunnels(5), shorewall-zones(5)NOTES¶
- 2.
- shorewall6-exclusion
10/19/2014 | Configuration Files |