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Reference

Table of Contents

Classes

Public Classes

  • firewall: Performs the basic setup tasks required for using the firewall resources. At the moment this takes care of: iptables-persistent package ins

Private Classes

  • firewall::linux: Main linux class, includes all other classes
  • firewall::linux::archlinux: Manages iptables and ip6tables services, and creates files used for persistence, on Arch Linux systems.
  • firewall::linux::debian: Installs the iptables-persistent package for Debian-alike systems. This allows rules to be stored to file and restored on boot.
  • firewall::linux::gentoo: Manages iptables and ip6tables services, and creates files used for persistence, on Gentoo Linux systems.
  • firewall::linux::redhat: Manages the iptables service on RedHat-alike systems.
  • firewall::params: Provides defaults for the Apt module parameters.

Resource types

  • firewall: This type provides the capability to manage firewall rules within puppet.
  • firewallchain: This type provides the capability to manage rule chains for firewalls.

Classes

firewall

Performs the basic setup tasks required for using the firewall resources.

At the moment this takes care of:

iptables-persistent package installation Include the firewall class for nodes that need to use the resources in this module:

Examples

class { 'firewall': }

Parameters

The following parameters are available in the firewall class.

ensure

Data type: Any

Controls the state of the ipv4 iptables service on your system. Valid options: 'running' or 'stopped'.

Default value: running

ensure_v6

Data type: Any

Controls the state of the ipv6 iptables service on your system. Valid options: 'running' or 'stopped'.

Default value: undef

pkg_ensure

Data type: Any

Controls the state of the iptables package on your system. Valid options: 'present' or 'latest'.

Default value: present

service_name

Data type: Any

Specify the name of the IPv4 iptables service.

Default value: $::firewall::params::service_name

service_name_v6

Data type: Any

Specify the name of the IPv6 iptables service.

Default value: $::firewall::params::service_name_v6

package_name

Data type: Any

Specify the platform-specific package(s) to install.

Default value: $::firewall::params::package_name

ebtables_manage

Data type: Any

Controls whether puppet manages the ebtables package or not. If managed, the package will use the value of pkg_ensure.

Default value: false

Resource types

firewall

Autorequires:

If Puppet is managing the iptables or ip6tables chains specified in the chain or jump parameters, the firewall resource will autorequire those firewallchain resources.

If Puppet is managing the iptables, iptables-persistent, or iptables-services packages, and the provider is iptables or ip6tables, the firewall resource will autorequire those packages to ensure that any required binaries are installed.

Providers

Note: Not all features are available with all providers.

  • ip6tables: Ip6tables type provider

    • Required binaries: ip6tables-save, ip6tables.
    • Supported features: address_type, connection_limiting, dnat, hop_limiting, icmp_match, interface_match, iprange, ipsec_dir, ipsec_policy, ipset, iptables, isfirstfrag, ishasmorefrags, islastfrag, length, log_level, log_prefix, log_uid, mark, mask, mss, owner, pkttype, queue_bypass, queue_num, rate_limiting, recent_limiting, reject_type, snat, socket, state_match, string_matching, tcp_flags, hashlimit, bpf.

  • iptables: Iptables type provider

    • Required binaries: iptables-save, iptables.
    • Default for kernel == linux.
    • Supported features: address_type, clusterip, connection_limiting, dnat, icmp_match, interface_match, iprange, ipsec_dir, ipsec_policy, ipset, iptables, isfragment, length, log_level, log_prefix, log_uid, mark, mask, mss, netmap, nflog_group, nflog_prefix, nflog_range, nflog_threshold, owner, pkttype, queue_bypass, queue_num, rate_limiting, recent_limiting, reject_type, snat, socket, state_match, string_matching, tcp_flags, bpf.

Features

  • address_type: The ability to match on source or destination address type.

  • clusterip: Configure a simple cluster of nodes that share a certain IP and MAC address without an explicit load balancer in front of them.

  • connection_limiting: Connection limiting features.

  • dnat: Destination NATing.

  • hop_limiting: Hop limiting features.

  • icmp_match: The ability to match ICMP types.

  • interface_match: Interface matching.

  • iprange: The ability to match on source or destination IP range.

  • ipsec_dir: The ability to match IPsec policy direction.

  • ipsec_policy: The ability to match IPsec policy.

  • iptables: The provider provides iptables features.

  • isfirstfrag: The ability to match the first fragment of a fragmented ipv6 packet.

  • isfragment: The ability to match fragments.

  • ishasmorefrags: The ability to match a non-last fragment of a fragmented ipv6 packet.

  • islastfrag: The ability to match the last fragment of an ipv6 packet.

  • length: The ability to match the length of the layer-3 payload.

  • log_level: The ability to control the log level.

  • log_prefix: The ability to add prefixes to log messages.

  • log_uid: The ability to log the userid of the process which generated the packet.

  • mark: The ability to match or set the netfilter mark value associated with the packet.

  • mask: The ability to match recent rules based on the ipv4 mask.

  • nflog_group: The ability to set the group number for NFLOG.

  • nflog_prefix: The ability to set a prefix for nflog messages.

  • nflog_range: The ability to set nflog_range.

  • nflog_threshold: The ability to set nflog_threshold.

  • owner: The ability to match owners.

  • pkttype: The ability to match a packet type.

  • rate_limiting: Rate limiting features.

  • recent_limiting: The netfilter recent module.

  • reject_type: The ability to control reject messages.

  • set_mss: Set the TCP MSS of a packet.

  • snat: Source NATing.

  • socket: The ability to match open sockets.

  • state_match: The ability to match stateful firewall states.

  • string_matching: The ability to match a given string by using some pattern matching strategy.

  • tcp_flags: The ability to match on particular TCP flag settings.

  • netmap: The ability to map entire subnets via source or destination nat rules.

  • hashlimit: The ability to use the hashlimit-module.

  • bpf: The ability to use Berkeley Paket Filter rules.

  • ipvs: The ability to match IP Virtual Server packets.

  • ct_target: The ability to set connection tracking parameters for a packet or its associated connection.

Properties

The following properties are available in the firewall type.

ensure

Valid values: present, absent

Manage the state of this rule.

Default value: present

action

Valid values: accept, reject, drop

This is the action to perform on a match. Can be one of:

  • accept - the packet is accepted
  • reject - the packet is rejected with a suitable ICMP response
  • drop - the packet is dropped

If you specify no value it will simply match the rule but perform no action unless you provide a provider specific parameter (such as jump).

source

The source address. For example:

source => '192.168.2.0/24'

You can also negate a mask by putting ! in front. For example:

source => '! 192.168.2.0/24'

The source can also be an IPv6 address if your provider supports it.

src_range

The source IP range. For example:

src_range => '192.168.1.1-192.168.1.10'

The source IP range must be in 'IP1-IP2' format.

destination

The destination address to match. For example:

destination => '192.168.1.0/24'

You can also negate a mask by putting ! in front. For example:

destination  => '! 192.168.2.0/24'

The destination can also be an IPv6 address if your provider supports it.

dst_range

The destination IP range. For example:

dst_range => '192.168.1.1-192.168.1.10'

The destination IP range must be in 'IP1-IP2' format.

sport

The source port to match for this filter (if the protocol supports ports). Will accept a single element or an array.

For some firewall providers you can pass a range of ports in the format:

<start_number>-<ending_number>

For example:

1-1024

This would cover ports 1 to 1024.

dport

The destination port to match for this filter (if the protocol supports ports). Will accept a single element or an array.

For some firewall providers you can pass a range of ports in the format:

<start_number>-<ending_number>

For example:

1-1024

This would cover ports 1 to 1024.

port

note This property has been DEPRECATED

The destination or source port to match for this filter (if the protocol supports ports). Will accept a single element or an array.

For some firewall providers you can pass a range of ports in the format:

<start_number>-<ending_number>

For example:

1-1024

This would cover ports 1 to 1024.

dst_type

Valid values: [:UNSPEC, :UNICAST, :LOCAL, :BROADCAST, :ANYCAST, :MULTICAST, :BLACKHOLE, :UNREACHABLE, :PROHIBIT, :THROW, :NAT, :XRESOLVE].map { |address_type| [ address_type, "! #{address_type}".to_sym, "#{address_type} --limit-iface-in".to_sym, "#{address_type} --limit-iface-out".to_sym, "! #{address_type} --limit-iface-in".to_sym, "! #{address_type} --limit-iface-out".to_sym, ] }.flatten

The destination address type. For example:

dst_type => ['LOCAL']

Can be one of:

  • UNSPEC - an unspecified address
  • UNICAST - a unicast address
  • LOCAL - a local address
  • BROADCAST - a broadcast address
  • ANYCAST - an anycast packet
  • MULTICAST - a multicast address
  • BLACKHOLE - a blackhole address
  • UNREACHABLE - an unreachable address
  • PROHIBIT - a prohibited address
  • THROW - undocumented
  • NAT - undocumented
  • XRESOLVE - undocumented

In addition, it accepts '--limit-iface-in' and '--limit-iface-out' flags, specified as:

dst_type => ['LOCAL --limit-iface-in']

It can also be negated using '!':

dst_type => ['! LOCAL']

Will accept a single element or an array.

src_type

Valid values: [:UNSPEC, :UNICAST, :LOCAL, :BROADCAST, :ANYCAST, :MULTICAST, :BLACKHOLE, :UNREACHABLE, :PROHIBIT, :THROW, :NAT, :XRESOLVE].map { |address_type| [ address_type, "! #{address_type}".to_sym, "#{address_type} --limit-iface-in".to_sym, "#{address_type} --limit-iface-out".to_sym, "! #{address_type} --limit-iface-in".to_sym, "! #{address_type} --limit-iface-out".to_sym, ] }.flatten

The source address type. For example:

src_type => ['LOCAL']

Can be one of:

  • UNSPEC - an unspecified address
  • UNICAST - a unicast address
  • LOCAL - a local address
  • BROADCAST - a broadcast address
  • ANYCAST - an anycast packet
  • MULTICAST - a multicast address
  • BLACKHOLE - a blackhole address
  • UNREACHABLE - an unreachable address
  • PROHIBIT - a prohibited address
  • THROW - undocumented
  • NAT - undocumented
  • XRESOLVE - undocumented

In addition, it accepts '--limit-iface-in' and '--limit-iface-out' flags, specified as:

src_type => ['LOCAL --limit-iface-in']

It can also be negated using '!':

src_type => ['! LOCAL']

Will accept a single element or an array.

proto

Valid values: [:ip, :tcp, :udp, :icmp, :"ipv6-icmp", :esp, :ah, :vrrp, :igmp, :ipencap, :ipv4, :ipv6, :ospf, :gre, :cbt, :sctp, :pim, :all].map { |proto| [proto, "! #{proto}".to_sym] }.flatten

The specific protocol to match for this rule.

Default value: tcp

mss

Match a given TCP MSS value or range.

tcp_flags

Match when the TCP flags are as specified. Is a string with a list of comma-separated flag names for the mask, then a space, then a comma-separated list of flags that should be set. The flags are: SYN ACK FIN RST URG PSH ALL NONE Note that you specify them in the order that iptables --list-rules would list them to avoid having puppet think you changed the flags. Example: FIN,SYN,RST,ACK SYN matches packets with the SYN bit set and the ACK,RST and FIN bits cleared. Such packets are used to request TCP connection initiation.

chain

Valid values: %r{^[a-zA-Z0-9-_]+$}

Name of the chain to use. Can be one of the built-ins:

  • INPUT
  • FORWARD
  • OUTPUT
  • PREROUTING
  • POSTROUTING

Or you can provide a user-based chain.

Default value: INPUT

table

Valid values: nat, mangle, filter, raw, rawpost

Table to use. Can be one of:

  • nat
  • mangle
  • filter
  • raw
  • rawpost

Default value: filter

jump

The value for the iptables --jump parameter. Normal values are:

  • QUEUE
  • RETURN
  • DNAT
  • SNAT
  • LOG
  • NFLOG
  • MASQUERADE
  • REDIRECT
  • MARK

But any valid chain name is allowed.

For the values ACCEPT, DROP, and REJECT, you must use the generic 'action' parameter. This is to enfore the use of generic parameters where possible for maximum cross-platform modelling.

If you set both 'accept' and 'jump' parameters, you will get an error as only one of the options should be set.

goto

The value for the iptables --goto parameter. Normal values are:

  • QUEUE
  • RETURN
  • DNAT
  • SNAT
  • LOG
  • MASQUERADE
  • REDIRECT
  • MARK

But any valid chain name is allowed.

iniface

Valid values: %r{^!?\s?[a-zA-Z0-9-._+:@]+$}

Input interface to filter on. Supports interface alias like eth0:0. To negate the match try this:

  iniface => '! lo',
outiface

Valid values: %r{^!?\s?[a-zA-Z0-9-._+:@]+$}

Output interface to filter on. Supports interface alias like eth0:0. To negate the match try this:

  outiface => '! lo',
tosource

When using jump => "SNAT" you can specify the new source address using this parameter.

todest

When using jump => "DNAT" you can specify the new destination address using this paramter.

toports

For DNAT this is the port that will replace the destination port.

to

For NETMAP this will replace the destination IP

random

Valid values: true, false

When using a jump value of "MASQUERADE", "DNAT", "REDIRECT", or "SNAT" this boolean will enable randomized port mapping.

reject

When combined with action => "REJECT" you can specify a different icmp response to be sent back to the packet sender.

log_level

When combined with jump => "LOG" specifies the system log level to log to.

log_prefix

When combined with jump => "LOG" specifies the log prefix to use when logging.

log_uid

Valid values: true, false

When combined with jump => "LOG" specifies the uid of the process making the connection.

nflog_group

Used with the jump target NFLOG. The netlink group (0 - 2^16-1) to which packets are (only applicable for nfnetlink_log). Defaults to 0.

nflog_prefix

Used with the jump target NFLOG. A prefix string to include in the log message, up to 64 characters long, useful for distinguishing messages in the logs.

nflog_range

Used with the jump target NFLOG. The number of bytes to be copied to userspace (only applicable for nfnetlink_log). nfnetlink_log instances may specify their own range, this option overrides it.

nflog_threshold

Used with the jump target NFLOG. Number of packets to queue inside the kernel before sending them to userspace (only applicable for nfnetlink_log). Higher values result in less overhead per packet, but increase delay until the packets reach userspace. Defaults to 1.

icmp

When matching ICMP packets, this is the type of ICMP packet to match.

A value of "any" is not supported. To achieve this behaviour the parameter should simply be omitted or undefined. An array of values is also not supported. To match against multiple ICMP types, please use separate rules for each ICMP type.

state

Valid values: INVALID, ESTABLISHED, NEW, RELATED, UNTRACKED

Matches a packet based on its state in the firewall stateful inspection table. Values can be:

  • INVALID
  • ESTABLISHED
  • NEW
  • RELATED
  • UNTRACKED
ctstate

Valid values: INVALID, ESTABLISHED, NEW, RELATED, UNTRACKED

Matches a packet based on its state in the firewall stateful inspection table, using the conntrack module. Values can be:

  • INVALID
  • ESTABLISHED
  • NEW
  • RELATED
  • UNTRACKED
connmark

Match the Netfilter mark value associated with the packet. Accepts either of: mark/mask or mark. These will be converted to hex if they are not already.

connlimit_above

Valid values: %r{^\d+$}

Connection limiting value for matched connections above n.

connlimit_mask

Valid values: %r{^\d+$}

Connection limiting by subnet mask for matched connections. IPv4: 0-32 IPv6: 0-128

hop_limit

Valid values: %r{^\d+$}

Hop limiting value for matched packets.

limit

Rate limiting value for matched packets. The format is: rate/[/second/|/minute|/hour|/day].

Example values are: '50/sec', '40/min', '30/hour', '10/day'."

burst

Valid values: %r{^\d+$}

Rate limiting burst value (per second) before limit checks apply.

uid

UID or Username owner matching rule. Accepts a string argument only, as iptables does not accept multiple uid in a single statement.

gid

GID or Group owner matching rule. Accepts a string argument only, as iptables does not accept multiple gid in a single statement.

match_mark

Match the Netfilter mark value associated with the packet. Accepts either of: mark/mask or mark. These will be converted to hex if they are not already.

set_mark

Set the Netfilter mark value associated with the packet. Accepts either of: mark/mask or mark. These will be converted to hex if they are not already.

clamp_mss_to_pmtu

Valid values: true, false

Sets the clamp mss to pmtu flag.

set_dscp

Set DSCP Markings.

set_dscp_class

This sets the DSCP field according to a predefined DiffServ class.

set_mss

Sets the TCP MSS value for packets.

pkttype

Valid values: unicast, broadcast, multicast

Sets the packet type to match.

isfragment

Valid values: true, false

Set to true to match tcp fragments (requires type to be set to tcp)

recent

Valid values: set, update, rcheck, remove

Enable the recent module. Takes as an argument one of set, update, rcheck or remove. For example:

# If anyone's appeared on the 'badguy' blacklist within
#  the last 60 seconds, drop their traffic, and update the timestamp.
firewall { '100 Drop badguy traffic':
  recent   => 'update',
  rseconds => 60,
  rsource  => true,
  rname    => 'badguy',
  action   => 'DROP',
  chain    => 'FORWARD',
}

# No-one should be sending us traffic on eth0 from the
#  localhost, Blacklist them
firewall { '101 blacklist strange traffic':
  recent      => 'set',
  rsource     => true,
  rname       => 'badguy',
  destination => '127.0.0.0/8',
  iniface     => 'eth0',
  action      => 'DROP',
  chain       => 'FORWARD',
}
rdest

Valid values: true, false

Recent module; add the destination IP address to the list. Must be boolean true.

rsource

Valid values: true, false

Recent module; add the source IP address to the list. Must be boolean true.

rname

Recent module; The name of the list. Takes a string argument.

rseconds

Recent module; used in conjunction with one of recent => 'rcheck' or recent => 'update'. When used, this will narrow the match to only happen when the address is in the list and was seen within the last given number of seconds.

reap

Valid values: true, false

Recent module; can only be used in conjunction with the rseconds attribute. When used, this will cause entries older than 'seconds' to be purged. Must be boolean true.

rhitcount

Recent module; used in conjunction with recent => 'update' or `recent => 'rcheck'. When used, this will narrow the match to only happen when the address is in the list and packets had been received greater than or equal to the given value.

rttl

Valid values: true, false

Recent module; may only be used in conjunction with one of recent => 'rcheck' or recent => 'update'. When used, this will narrow the match to only happen when the address is in the list and the TTL of the current packet matches that of the packet which hit the recent => 'set' rule. This may be useful if you have problems with people faking their source address in order to DoS you via this module by disallowing others access to your site by sending bogus packets to you. Must be boolean true.

socket

Valid values: true, false

If true, matches if an open socket can be found by doing a coket lookup on the packet.

ishasmorefrags

Valid values: true, false

If true, matches if the packet has it's 'more fragments' bit set. ipv6.

islastfrag

Valid values: true, false

If true, matches if the packet is the last fragment. ipv6.

isfirstfrag

Valid values: true, false

If true, matches if the packet is the first fragment. Sadly cannot be negated. ipv6.

ipsec_policy

Valid values: none, ipsec

Sets the ipsec policy type. May take a combination of arguments for any flags that can be passed to --pol ipsec such as: --strict, --reqid 100, --next, --proto esp, etc.

ipsec_dir

Valid values: in, out

Sets the ipsec policy direction

stat_mode

Valid values: nth, random

Set the matching mode for statistic matching.

stat_every

Match one packet every nth packet. Requires stat_mode => 'nth'

stat_packet

Valid values: %r{^\d+$}

Set the initial counter value for the nth mode. Must be between 0 and the value of stat_every. Defaults to 0. Requires stat_mode => 'nth'

stat_probability

Set the probability from 0 to 1 for a packet to be randomly matched. It works only with stat_mode => 'random'.

mask

Sets the mask to use when recent is enabled.

gateway

The TEE target will clone a packet and redirect this clone to another machine on the local network segment. gateway is the target host's IP.

ipset

Matches against the specified ipset list. Requires ipset kernel module. Will accept a single element or an array. The value is the name of the blacklist, followed by a space, and then 'src' and/or 'dst' separated by a comma. For example: 'blacklist src,dst'

checksum_fill

Valid values: true, false

Compute and fill missing packet checksums.

mac_source

Valid values: %r{^([0-9a-f]{2}[:]){5}([0-9a-f]{2})$}i

MAC Source

physdev_in

Valid values: %r{^[a-zA-Z0-9-._+]+$}

Match if the packet is entering a bridge from the given interface.

physdev_out

Valid values: %r{^[a-zA-Z0-9-._+]+$}

Match if the packet is leaving a bridge via the given interface.

physdev_is_bridged

Valid values: true, false

Match if the packet is transversing a bridge.

physdev_is_in

Valid values: true, false

Matches if the packet has entered through a bridge interface.

physdev_is_out

Valid values: true, false

Matches if the packet will leave through a bridge interface.

date_start

Only match during the given time, which must be in ISO 8601 "T" notation. The possible time range is 1970-01-01T00:00:00 to 2038-01-19T04:17:07

date_stop

Only match during the given time, which must be in ISO 8601 "T" notation. The possible time range is 1970-01-01T00:00:00 to 2038-01-19T04:17:07

time_start

Only match during the given daytime. The possible time range is 00:00:00 to 23:59:59. Leading zeroes are allowed (e.g. "06:03") and correctly interpreted as base-10.

time_stop

Only match during the given daytime. The possible time range is 00:00:00 to 23:59:59. Leading zeroes are allowed (e.g. "06:03") and correctly interpreted as base-10.

month_days

Only match on the given days of the month. Possible values are 1 to 31. Note that specifying 31 will of course not match on months which do not have a 31st day; the same goes for 28- or 29-day February.

week_days

Valid values: Mon, Tue, Wed, Thu, Fri, Sat, Sun

Only match on the given weekdays.

time_contiguous

Valid values: true, false

When time_stop is smaller than time_start value, match this as a single time period instead distinct intervals.

kernel_timezone

Valid values: true, false

Use the kernel timezone instead of UTC to determine whether a packet meets the time regulations.

clusterip_new

Valid values: true, false

Used with the CLUSTERIP jump target. Create a new ClusterIP. You always have to set this on the first rule for a given ClusterIP.

clusterip_hashmode

Valid values: sourceip, sourceip-sourceport, sourceip-sourceport-destport

Used with the CLUSTERIP jump target. Specify the hashing mode.

clusterip_clustermac

Valid values: %r{^([0-9a-f]{2}[:]){5}([0-9a-f]{2})$}i

Used with the CLUSTERIP jump target. Specify the ClusterIP MAC address. Has to be a link-layer multicast address.

clusterip_total_nodes

Valid values: %r{\d+}

Used with the CLUSTERIP jump target. Number of total nodes within this cluster.

clusterip_local_node

Valid values: %r{\d+}

Used with the CLUSTERIP jump target. Specify the random seed used for hash initialization.

clusterip_hash_init

Used with the CLUSTERIP jump target. Specify the random seed used for hash initialization.

length

Sets the length of layer-3 payload to match.

string

String matching feature. Matches the packet against the pattern given as an argument.

string_algo

Valid values: bm, kmp

String matching feature, pattern matching strategy.

string_from

String matching feature, offset from which we start looking for any matching.

string_to

String matching feature, offset up to which we should scan.

queue_num

Used with NFQUEUE jump target. What queue number to send packets to

queue_bypass

Valid values: true, false

Used with NFQUEUE jump target Allow packets to bypass :queue_num if userspace process is not listening

src_cc

Valid values: %r{^[A-Z]{2}(,[A-Z]{2})*$}

src attribute for the module geoip

dst_cc

Valid values: %r{^[A-Z]{2}(,[A-Z]{2})*$}

dst attribute for the module geoip

hashlimit_name

The name for the /proc/net/ipt_hashlimit/foo entry. This parameter is required.

hashlimit_upto

Match if the rate is below or equal to amount/quantum. It is specified either as a number, with an optional time quantum suffix (the default is 3/hour), or as amountb/second (number of bytes per second). This parameter or hashlimit_above is required. Allowed forms are '40','40/second','40/minute','40/hour','40/day'.

hashlimit_above

Match if the rate is above amount/quantum. This parameter or hashlimit_upto is required. Allowed forms are '40','40/second','40/minute','40/hour','40/day'.

hashlimit_burst

Valid values: %r{^\d+$}

Maximum initial number of packets to match: this number gets recharged by one every time the limit specified above is not reached, up to this number; the default is 5. When byte-based rate matching is requested, this option specifies the amount of bytes that can exceed the given rate. This option should be used with caution -- if the entry expires, the burst value is reset too.

hashlimit_mode

A comma-separated list of objects to take into consideration. If no --hashlimit-mode option is given, hashlimit acts like limit, but at the expensive of doing the hash housekeeping. Allowed values are: srcip, srcport, dstip, dstport

hashlimit_srcmask

When --hashlimit-mode srcip is used, all source addresses encountered will be grouped according to the given prefix length and the so-created subnet will be subject to hashlimit. prefix must be between (inclusive) 0 and 32. Note that --hashlimit-srcmask 0 is basically doing the same thing as not specifying srcip for --hashlimit-mode, but is technically more expensive.

hashlimit_dstmask

Like --hashlimit-srcmask, but for destination addresses.

hashlimit_htable_size

The number of buckets of the hash table

hashlimit_htable_max

Maximum entries in the hash.

hashlimit_htable_expire

After how many milliseconds do hash entries expire.

hashlimit_htable_gcinterval

How many milliseconds between garbage collection intervals.

bytecode

Match using Linux Socket Filter. Expects a BPF program in decimal format. This is the format generated by the nfbpf_compile utility.

ipvs

Valid values: true, false

Indicates that the current packet belongs to an IPVS connection.

zone

Assign this packet to zone id and only have lookups done in that zone.

Parameters

The following parameters are available in the firewall type.

name

Valid values: %r{^\d+[[:graph:][:space:]]+$}

namevar

The canonical name of the rule. This name is also used for ordering so make sure you prefix the rule with a number:

000 this runs first
999 this runs last

Depending on the provider, the name of the rule can be stored using the comment feature of the underlying firewall subsystem.

line

Read-only property for caching the rule line.

firewallchain

Currently this supports only iptables, ip6tables and ebtables on Linux. And provides support for setting the default policy on chains and tables that allow it.

Autorequires: If Puppet is managing the iptables, iptables-persistent, or iptables-services packages, and the provider is iptables_chain, the firewall resource will autorequire those packages to ensure that any required binaries are installed.

Providers

  • iptables_chain is the only provider that supports firewallchain.

Features

  • iptables_chain: The provider provides iptables chain features.
  • policy: Default policy (inbuilt chains only).

Properties

The following properties are available in the firewallchain type.

ensure

Valid values: present, absent

The basic property that the resource should be in.

Default value: present

policy

Valid values: accept, drop, queue, return

This is the action to when the end of the chain is reached. It can only be set on inbuilt chains (INPUT, FORWARD, OUTPUT, PREROUTING, POSTROUTING) and can be one of:

  • accept - the packet is accepted
  • drop - the packet is dropped
  • queue - the packet is passed userspace
  • return - the packet is returned to calling (jump) queue or the default of inbuilt chains

Parameters

The following parameters are available in the firewallchain type.

name

namevar

The canonical name of the chain.

For iptables the format must be {chain}:{table}:{protocol}.

purge

Valid values: false, true

Purge unmanaged firewall rules in this chain

Default value: false

ignore

Regex to perform on firewall rules to exempt unmanaged rules from purging (when enabled). This is matched against the output of iptables-save.

This can be a single regex, or an array of them. To support flags, use the ruby inline flag mechanism. Meaning a regex such as /foo/i can be written as '(?i)foo' or '(?i:foo)'

Full example:

firewallchain { 'INPUT:filter:IPv4':
  purge => true,
  ignore => [
    '-j fail2ban-ssh', # ignore the fail2ban jump rule
    '--comment "[^"]*(?i:ignore)[^"]*"', # ignore any rules with "ignore" (case insensitive) in the comment in the rule
  ],
}