Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
---
v2: add note about SELinux requirements for this example
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 <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
+ }
+}
--
2.24.0
