files: add example secmark config

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/files/examples/Makefile.am b/files/examples/Makefile.am
index c40e041e43578017d3b134e5ff344ad466eb17fd..b29e9f614203390bed83d745e7f861049313d2b7 100644 (file)
--- 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 (executable)
index 0000000..16f9a36
--- /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 <file>`
+# 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
+       }
+}