Defined Type: nftables::client
- Defined in:
- modules/nftables/manifests/client.pp
Summary
Create nft rules for a client (permit outbound)Overview
SPDX-License-Identifier: Apache-2.0
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# File 'modules/nftables/manifests/client.pp', line 26
define nftables::client (
Wmflib::Protocol $proto,
Wmflib::Ensure $ensure = present,
Integer[0,99] $prio = 10,
Optional[String] $desc = undef,
Optional[Nftables::Port] $port = undef,
Optional[Firewall::Portrange] $port_range = undef,
Array[Stdlib::IP::Address] $src_ips = [],
Array[Stdlib::IP::Address] $dst_ips = [],
Array[String[1]] $src_sets = [],
Array[String[1]] $dst_sets = [],
Boolean $notrack = false,
Boolean $skip_output_chain = false,
Optional[Firewall::Qos] $qos = undef,
) {
# TODO: there is a nftables construct 'concatenation' that can drastically
# reduce the amount of filtering rules in the system.
# this define doesn't support it, but we may in the future!
# see https://wiki.nftables.org/wiki-nftables/index.php/Concatenations
$_port = $port.then |$x| { [$x].flatten }
# figure out transport protocol statements
if !$_port.empty() and $port_range {
fail("${title}: You can only pass an array of ports or a range, but not both")
}
if !$_port.empty() {
$port_stmt = "${proto} dport { ${_port.sort.join(', ')} }"
} elsif $port_range {
if $port_range[0] >= $port_range[1] {
fail("${title}: Incorrect port range ${port_range[0]} >= ${port_range[1]}")
}
$port_stmt = "${proto} dport ${port_range.join('-')}"
} elsif $port.empty() and !$port_range {
fail("${title}: You need at least one of port or port_range")
}
# figure out IPv4 source statements
$src_ipv4_addrs = $src_ips.filter |$host| { $host =~ Stdlib::IP::Address::V4 }.sort.unique
$src_raw_v4_stmts = [ $src_ipv4_addrs.empty.bool2str('', "ip saddr { ${src_ipv4_addrs.join(', ')} }") ]
$src_set_v4_stmts = $src_sets.map |$set| { "ip saddr @${set}_ipv4" }
$src_v4 = $src_raw_v4_stmts + $src_set_v4_stmts
# figure out IPv4 dest statements
$dst_ipv4_addrs = $dst_ips.filter |$host| { $host =~ Stdlib::IP::Address::V4 }.sort.unique
$dst_raw_v4_stmts = [ $dst_ipv4_addrs.empty.bool2str('', "ip daddr { ${dst_ipv4_addrs.join(', ')} }") ]
$dst_set_v4_stmts = $dst_sets.map |$set| { "ip daddr @${set}_ipv4" }
$dst_v4 = $dst_raw_v4_stmts + $dst_set_v4_stmts
# figure out combination of IPv4 src and dest statements
$maybe_l3_v4_stmts = $src_v4.map |$src| {
$dst_v4.map |$dst| {
"${src} ${dst}".strip
}
}.flatten.sort.filter |$x| { $x !~ /^\s*$/ }
# T351094: Ensure that we have valid v4 addresses after filtering.
# This prevents us from having an empty rule if e.g. dst_ips contains no ipv4 address
if ($src_ipv4_addrs.empty and !$src_ips.empty) or ($dst_ipv4_addrs.empty and !$dst_ips.empty) {
$l3_v4_stmts = []
} else {
# Remove smaller statements that are contained in stricter rules, to avoid firewall holes.
# I understand if this gives you headache, so let me explain:
# if we are producing 2 rules:
# "ip saddr 1.1.1.1 accept"
# "ip saddr 1.1.1.1 ip daddr 2.2.2.2 accept"
# the second rule wont ever match because packets are accepted by the first. The first rule
# is what we are killing here, because we have an stricter one.
# Filter the 'maybe statements', and remove each statement that is contained in other statements.
$l3_v4_stmts = $maybe_l3_v4_stmts.filter |$i| {
! $maybe_l3_v4_stmts.filter |$j| { $i != $j }.reduce(false) |$memo, $x| {
$memo or ($i in $x)
}
}
}
# figure out IPv6 source statements
$src_ipv6_addrs = $src_ips.filter |$host| { $host =~ Stdlib::IP::Address::V6 }.sort.unique
$src_raw_v6_stmts = [ $src_ipv6_addrs.empty.bool2str('', "ip6 saddr { ${src_ipv6_addrs.join(', ')} }") ]
$src_set_v6_stmts = $src_sets.map |$set| { "ip6 saddr @${set}_ipv6" }
$src_v6 = $src_raw_v6_stmts + $src_set_v6_stmts
# figure out IPv6 dest statements
$dst_ipv6_addrs = $dst_ips.filter |$host| { $host =~ Stdlib::IP::Address::V6 }.sort.unique
$dst_raw_v6_stmts = [ $dst_ipv6_addrs.empty.bool2str('', "ip6 daddr { ${dst_ipv6_addrs.join(', ')} }") ]
$dst_set_v6_stmts = $dst_sets.map |$set| { "ip6 daddr @${set}_ipv6" }
$dst_v6 = $dst_raw_v6_stmts + $dst_set_v6_stmts
# figure out combination of IPv6 src and dest statements
$maybe_l3_v6_stmts = $src_v6.map |$src| {
$dst_v6.map |$dst| {
"${src} ${dst}".strip
}
}.flatten.sort.filter |$x| { $x !~ /^\s*$/ }
# T351094: Ensure that we have valid v4 addresses after filtering.
# This prevents us from having an empty rule if e.g. dst_ips contains no ipv4 address
if ($src_ipv6_addrs.empty and !$src_ips.empty) or ($dst_ipv6_addrs.empty and !$dst_ips.empty) {
$l3_v6_stmts = []
} else {
# See comment above about contained statements and headache
$l3_v6_stmts = $maybe_l3_v6_stmts.filter |$i| {
! $maybe_l3_v6_stmts.filter |$j| { $i != $j }.reduce(false) |$memo, $x| {
$memo or ($i in $x)
}
}
}
$l3_stmts = ($l3_v4_stmts + $l3_v6_stmts).sort
$rules = $l3_stmts.empty() ? {
true => ["${port_stmt} accept"],
default => $l3_stmts.map |$l3_stmt| { "${l3_stmt} ${port_stmt} accept".strip },
}
$content = @("CONTENT")
# Managed by puppet
# ${desc}
${rules.join("\n")}
| CONTENT
if $src_sets and $dst_sets {
$file_require = Nftables::Set[$dst_sets + $src_sets]
} elsif $dst_sets {
$file_require = Nftables::Set[$dst_sets]
} elsif $src_sets {
$file_require = Nftables::Set[src_sets]
} else {
$file_require = undef
}
if $notrack {
$notrack_rule = regsubst($content, 'accept$', 'notrack')
$notrack_filename = sprintf('/etc/nftables/notrack/%02d_%s.nft', $prio, $title)
@file { $notrack_filename:
ensure => $ensure,
owner => 'root',
group => 'root',
mode => '0444',
content => $notrack_rule,
notify => Service['nftables'],
require => $file_require,
tag => 'nft',
}
}
if !$skip_output_chain {
$filename = sprintf('/etc/nftables/output/%02d_%s.nft', $prio, $title)
@file { $filename:
ensure => $ensure,
mode => '0444',
content => $content,
notify => Service['nftables'],
require => $file_require,
tag => 'nft',
}
}
if $qos != undef {
$dscp = firewall::qos2dscp($qos)
$dscp_v4_rules = $l3_v4_stmts.empty() ? {
true => ["${port_stmt} ip dscp set ${dscp} return"],
default => $l3_v4_stmts.map |$l3_v4_stmt| { "${l3_v4_stmt} ${port_stmt} ip dscp set ${dscp} return".strip },
}
$dscp_v6_rules = $l3_v6_stmts.empty() ? {
true => ["${port_stmt} ip6 dscp set ${dscp} return"],
default => $l3_v6_stmts.map |$l3_v6_stmt| { "${l3_v6_stmt} ${port_stmt} ip6 dscp set ${dscp} return".strip },
}
$dscp_rules = ($dscp_v4_rules + $dscp_v6_rules).sort
$postrouting_content = @("POST_CONTENT")
# Managed by puppet
# ${desc}
${dscp_rules.join("\n")}
| POST_CONTENT
$postrouting_filename = sprintf('/etc/nftables/postrouting/%02d_%s_client_%s.nft', $prio, $title, $qos)
@file { $postrouting_filename:
ensure => $ensure,
mode => '0444',
content => $postrouting_content,
notify => Service['nftables'],
require => $file_require,
tag => 'nft',
}
}
}
|