From 94a46b8ba0162b712e49482661502a2cdd87d225 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= Date: Sat, 23 Nov 2019 17:22:40 +0100 Subject: files: add example secmark config MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Christian Göttsche Signed-off-by: Pablo Neira Ayuso --- files/examples/Makefile.am | 1 + files/examples/secmark.nft | 87 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+) create mode 100755 files/examples/secmark.nft diff --git a/files/examples/Makefile.am b/files/examples/Makefile.am index c40e041e..b29e9f61 100644 --- a/files/examples/Makefile.am +++ b/files/examples/Makefile.am @@ -1,4 +1,5 @@ pkgdocdir = ${docdir}/examples dist_pkgdoc_SCRIPTS = ct_helpers.nft \ load_balancing.nft \ + secmark.nft \ sets_and_maps.nft diff --git a/files/examples/secmark.nft b/files/examples/secmark.nft new file mode 100755 index 00000000..16f9a368 --- /dev/null +++ b/files/examples/secmark.nft @@ -0,0 +1,87 @@ +#!/usr/sbin/nft -f + +# This example file shows how to use secmark labels with the nftables framework. +# This script is meant to be loaded with `nft -f ` +# You require linux kernel >= 4.20 and nft >= 0.9.3 +# This example is SELinux based, for the secmark objects you require +# SELinux enabled and a SELinux policy defining the stated contexts +# For up-to-date information please visit https://wiki.nftables.org + + +flush ruleset + +table inet filter { + secmark ssh_server { + "system_u:object_r:ssh_server_packet_t:s0" + } + + secmark dns_client { + "system_u:object_r:dns_client_packet_t:s0" + } + + secmark http_client { + "system_u:object_r:http_client_packet_t:s0" + } + + secmark https_client { + "system_u:object_r:http_client_packet_t:s0" + } + + secmark ntp_client { + "system_u:object_r:ntp_client_packet_t:s0" + } + + secmark icmp_client { + "system_u:object_r:icmp_client_packet_t:s0" + } + + secmark icmp_server { + "system_u:object_r:icmp_server_packet_t:s0" + } + + secmark ssh_client { + "system_u:object_r:ssh_client_packet_t:s0" + } + + secmark git_client { + "system_u:object_r:git_client_packet_t:s0" + } + + map secmapping_in { + type inet_service : secmark + elements = { 22 : "ssh_server" } + } + + map secmapping_out { + type inet_service : secmark + elements = { 22 : "ssh_client", 53 : "dns_client", 80 : "http_client", 123 : "ntp_client", 443 : "http_client", 9418 : "git_client" } + } + + chain input { + type filter hook input priority 0; + + # label new incoming packets and add to connection + ct state new meta secmark set tcp dport map @secmapping_in + ct state new meta secmark set udp dport map @secmapping_in + ct state new ip protocol icmp meta secmark set "icmp_server" + ct state new ip6 nexthdr icmpv6 meta secmark set "icmp_server" + ct state new ct secmark set meta secmark + + # set label for est/rel packets from connection + ct state established,related meta secmark set ct secmark + } + + chain output { + type filter hook output priority 0; + + # label new outgoing packets and add to connection + ct state new meta secmark set tcp dport map @secmapping_out + ct state new meta secmark set udp dport map @secmapping_out + ct state new ip protocol icmp meta secmark set "icmp_client" + ct state new ip6 nexthdr icmpv6 meta secmark set "icmp_client" + ct state new ct secmark set meta secmark + + # set label for est/rel packets from connection + ct state established,related meta secmark set ct secmark + } +} -- cgit v1.2.3