diff options
| -rwxr-xr-x | roles/common/templates/etc/nftables.conf.j2 | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/roles/common/templates/etc/nftables.conf.j2 b/roles/common/templates/etc/nftables.conf.j2 index 2261994..098a66d 100755 --- a/roles/common/templates/etc/nftables.conf.j2 +++ b/roles/common/templates/etc/nftables.conf.j2 @@ -61,9 +61,10 @@ table inet filter { # 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.) + # 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 - # ipsec in ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} 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 # rate-limiting is done directly by the kernel (net.ipv4.icmp_{ratelimit,ratemask} runtime options) @@ -110,7 +111,7 @@ table inet filter { # 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 - # ipsec out ip saddr {{ ipsec[inventory_hostname_short] }} ip daddr {{ ipsec_subnet }} 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 meta l4proto { icmp, icmpv6 } accept |