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authorGuilhem Moulin <guilhem@fripost.org>2020-11-03 02:26:43 +0100
committerGuilhem Moulin <guilhem@fripost.org>2020-11-03 03:36:57 +0100
commit24616de43c39da3fe7efd72426fce078a3afdaea (patch)
treecfe82e17f7354ad9214c2b256af7ca2bf6f0be35 /roles/common
parenta6b8c0b3a4758f8d84a7ad07bb9e068075d098d3 (diff)
Firewall: Move IPsec/ICMP/ICMPv6 rules to ingress chain.
This is required to receive incoming traffic to our IPsec IP in 172.16.0.0/24, as well as linked-scoped ICMPv6 traffic from/to fe80::/10 (for neighbour discovery). Regression from a6b8c0b3a4758f8d84a7ad07bb9e068075d098d3.
Diffstat (limited to 'roles/common')
-rwxr-xr-xroles/common/templates/etc/nftables.conf.j224
1 files changed, 16 insertions, 8 deletions
diff --git a/roles/common/templates/etc/nftables.conf.j2 b/roles/common/templates/etc/nftables.conf.j2
index d788457..bbc0e7c 100755
--- a/roles/common/templates/etc/nftables.conf.j2
+++ b/roles/common/templates/etc/nftables.conf.j2
@@ -53,6 +53,20 @@ table netdev filter {
type filter hook ingress device {{ if }} priority -499
policy accept
+ # IPsec traffic (refined later in the filter rule)
+ ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} meta secpath exists accept
+
+ # rate-limiting is done directly by the kernel (net.ipv4.icmp_{ratelimit,ratemask} runtime options)
+ icmp type { echo-reply, echo-request, destination-unreachable } counter accept
+ icmpv6 type { echo-reply, echo-request, destination-unreachable,
+ packet-too-big, time-exceeded, parameter-problem } counter accept
+
+ # accept neighbour discovery for autoconfiguration, RFC 4890 sec. 4.4.1
+ ip6 hoplimit 255 icmpv6 type { 133,134,135,136,141,142 } counter accept
+
+ # reject all remaining ICMP/ICMPv6 traffic
+ meta l4proto { icmp, icmpv6 } drop
+
# bogon filter (cf. RFC 6890 for non-global ip addresses)
define bogon = {
0.0.0.0/8 # this host, on this network (RFC 1122 sec. 3.2.1.3)
@@ -151,13 +165,7 @@ table inet filter {
# ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} ipsec in reqid $i accept
ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} meta secpath exists accept
- # rate-limiting is done directly by the kernel (net.ipv4.icmp_{ratelimit,ratemask} runtime options)
- icmp type { echo-reply, echo-request, destination-unreachable } counter accept
- icmpv6 type { echo-reply, echo-request, destination-unreachable,
- packet-too-big, time-exceeded, parameter-problem } counter accept
-
- # accept neighbour discovery for autoconfiguration, RFC 4890 sec. 4.4.1
- icmpv6 type { 133,134,135,136,141,142 } ip6 hoplimit 255 counter accept
+ meta l4proto { icmp, icmpv6 } counter accept
udp sport 123 udp dport 123 ct state related,established accept
{% if groups.all | length > 1 %}
@@ -195,7 +203,7 @@ table inet filter {
# ip saddr {{ ipsec[inventory_hostname_short] }} ip daddr {{ ipsec_subnet }} ipsec out reqid $i accept
ip saddr {{ ipsec[inventory_hostname_short] }} ip daddr {{ ipsec_subnet }} accept
- meta l4proto { icmp, icmpv6 } accept
+ meta l4proto { icmp, icmpv6 } counter accept
udp sport 123 udp dport 123 ct state new,related,established accept
{% if groups.all | length > 1 %}