diff options
Diffstat (limited to 'roles/common/templates/etc/nftables.conf.j2')
| -rwxr-xr-x | roles/common/templates/etc/nftables.conf.j2 | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/roles/common/templates/etc/nftables.conf.j2 b/roles/common/templates/etc/nftables.conf.j2 index 8d81d4c..f603ed9 100755 --- a/roles/common/templates/etc/nftables.conf.j2 +++ b/roles/common/templates/etc/nftables.conf.j2 @@ -73,7 +73,7 @@ table netdev filter { # 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) -{% if not addr | ipaddr('10.0.0.0/8') %} +{% if not addr | ansible.utils.ipaddr('10.0.0.0/8') %} , 10.0.0.0/8 # private-use (RFC 1918) {% endif %} , 100.64.0.0/10 # shared address space (RFC 6598) @@ -82,7 +82,7 @@ table netdev filter { , 172.16.0.0/12 # private-use (RFC 1918) , 192.0.0.0/24 # IETF protocol assignments (RFC 6890 sec. 2.1) , 192.0.2.0/24 # documentation (RFC 5737) -{% if not addr | ipaddr('192.168.0.0/16') %} +{% if not addr | ansible.utils.ipaddr('192.168.0.0/16') %} , 192.168.0.0/16 # private-use (RFC 1918) {% endif %} , 198.18.0.0/15 # benchmarking (RFC 2544) @@ -145,7 +145,7 @@ table inet raw { } table inet filter { - # blackholes + # blackholes (timeout must match /etc/fail2ban/jail.local) set fail2ban { type ipv4_addr; timeout 10m; } set fail2ban6 { type ipv6_addr; timeout 10m; } @@ -155,16 +155,8 @@ table inet filter { iif lo accept - # XXX Bullseye: this is a rather crude match as nftables 0.9.0 lacks support for ipsec expressions - # to match match inbound resp. outbound policies and source resp. destination tunnel addresses. - # https://serverfault.com/questions/971735/how-to-match-reqid-in-nftables - # https://blog.fraggod.net/2016/09/25/nftables-re-injected-ipsec-matching-without-xt_policy.html - # (We can't use marks to match post-ESP decapsulation here because that doesn't work well with UDP - # encapsulation.) We'll also pin the reqid to the lowest address byte in ipsec.conf(5); that way - # peers can't impersonate each other. meta l4proto esp accept - # 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 + ip daddr {{ ipsec[inventory_hostname_short] }} jump ipsec-in # incoming ICMP/ICMPv6 traffic was filtered in the ingress chain already meta l4proto { icmp, icmpv6 } counter accept @@ -186,8 +178,8 @@ table inet filter { ip6 version 6 udp sport 547 udp dport 546 ct state related,established accept {% endif %} - meta l4proto tcp ip saddr @fail2ban counter drop - meta l4proto tcp ip6 saddr @fail2ban6 counter drop + ip saddr @fail2ban counter drop + ip6 saddr @fail2ban6 counter drop tcp dport $in-tcp-ports ct state related,established accept tcp dport $in-tcp-ports ct state new counter accept @@ -200,12 +192,8 @@ table inet filter { oif lo accept - # XXX Bullseye: unlike for input we can't use marks or test for - # secpath existence here, because by the time we see a packet to - # 172.16.0.0/24 we don't know if it'll be encapsulated meta l4proto esp accept - # 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 + ip saddr {{ ipsec[inventory_hostname_short] }} jump ipsec-out meta l4proto { icmp, icmpv6 } counter accept @@ -234,4 +222,17 @@ table inet filter { meta l4proto udp counter reject counter reject } + + chain ipsec-in { +{% for h in ipsec.keys() | difference([inventory_hostname_short]) | sort %} + ip saddr {{ ipsec[h] }} ipsec in reqid {{ ipsec[h].replace(":",".").split(".")[-1] }} counter accept +{% endfor %} + log prefix "ipsec-in " drop + } + chain ipsec-out { +{% for h in ipsec.keys() | difference([inventory_hostname_short]) | sort %} + ip daddr {{ ipsec[h] }} ipsec out reqid {{ ipsec[h].replace(":",".").split(".")[-1] }} counter accept +{% endfor %} + log prefix "ipsec-out " drop + } } |