From patchwork Thu Apr 18 21:11:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Tremer X-Patchwork-Id: 7737 Return-Path: Received: from mail01.ipfire.org (mail01.haj.ipfire.org [172.28.1.202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) client-signature ECDSA (secp384r1)) (Client CN "mail01.haj.ipfire.org", Issuer "R3" (verified OK)) by web04.haj.ipfire.org (Postfix) with ESMTPS id 4VL9T06ZZMz3wyD for ; Thu, 18 Apr 2024 21:12:04 +0000 (UTC) Received: from mail02.haj.ipfire.org (mail02.haj.ipfire.org [172.28.1.201]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) client-signature ECDSA (secp384r1)) (Client CN "mail02.haj.ipfire.org", Issuer "R3" (verified OK)) by mail01.ipfire.org (Postfix) with ESMTPS id 4VL9Sr6hS3z2VW; Thu, 18 Apr 2024 21:11:56 +0000 (UTC) Received: from mail02.haj.ipfire.org (localhost [127.0.0.1]) by mail02.haj.ipfire.org (Postfix) with ESMTP id 4VL9Sr5rwSz32qT; Thu, 18 Apr 2024 21:11:56 +0000 (UTC) Received: from mail01.ipfire.org (mail01.haj.ipfire.org [172.28.1.202]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) client-signature ECDSA (secp384r1)) (Client CN "mail01.haj.ipfire.org", Issuer "R3" (verified OK)) by mail02.haj.ipfire.org (Postfix) with ESMTPS id 4VL9Sm1snMz30CT for ; Thu, 18 Apr 2024 21:11:52 +0000 (UTC) Received: from michael.haj.ipfire.org (michael.haj.ipfire.org [172.28.1.242]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) client-signature ECDSA (secp384r1)) (Client CN "michael.haj.ipfire.org", Issuer "R3" (verified OK)) by mail01.ipfire.org (Postfix) with ESMTPS id 4VL9Sl4NnBzd9; Thu, 18 Apr 2024 21:11:51 +0000 (UTC) Received: by michael.haj.ipfire.org (Postfix, from userid 0) id 4VL9Sl3V9MzTh7D; Thu, 18 Apr 2024 21:11:51 +0000 (UTC) From: Michael Tremer To: development@lists.ipfire.org Subject: [PATCH 1/6] firewall: Split CONNTRACK chain Date: Thu, 18 Apr 2024 21:11:39 +0000 Message-Id: <20240418211144.3318938-1-michael.tremer@ipfire.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Message-ID-Hash: 5PUYYFTQBIOIRGIIV55PYSA5LJ5S3OVP X-Message-ID-Hash: 5PUYYFTQBIOIRGIIV55PYSA5LJ5S3OVP X-MailFrom: root@michael.haj.ipfire.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Michael Tremer X-Mailman-Version: 3.3.8 Precedence: list List-Id: IPFire development talk Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is preparation to handle incoming/outgoing packets differently. Signed-off-by: Michael Tremer --- src/initscripts/system/firewall | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/src/initscripts/system/firewall b/src/initscripts/system/firewall index 69bdcb594..d14466ef0 100644 --- a/src/initscripts/system/firewall +++ b/src/initscripts/system/firewall @@ -149,10 +149,15 @@ iptables_init() { fi iptables -A CTINVALID -j DROP -m comment --comment "DROP_CTINVALID" - iptables -N CONNTRACK - iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT - iptables -A CONNTRACK -m conntrack --ctstate INVALID -j CTINVALID - iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT + iptables -N CTINPUT + iptables -A CTINPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT + iptables -A CTINPUT -m conntrack --ctstate INVALID -j CTINVALID + iptables -A CTINPUT -p icmp -m conntrack --ctstate RELATED -j ACCEPT + + iptables -N CTOUTPUT + iptables -A CTOUTPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT + iptables -A CTOUTPUT -m conntrack --ctstate INVALID -j CTINVALID + iptables -A CTOUTPUT -p icmp -m conntrack --ctstate RELATED -j ACCEPT # Restore any connection marks iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark @@ -261,9 +266,9 @@ iptables_init() { done # Accept everything connected - for i in INPUT FORWARD OUTPUT; do - iptables -A ${i} -j CONNTRACK - done + iptables -A INPUT -j CTINPUT + iptables -A FORWARD -j CTINPUT + iptables -A OUTPUT -j CTOUTPUT # Allow DHCP iptables -N DHCPINPUT