From owner-freebsd-bugs@freebsd.org Wed Feb 22 12:03:11 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 246C8CE92BB for ; Wed, 22 Feb 2017 12:03:11 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id EE6DD1C0C for ; Wed, 22 Feb 2017 12:03:10 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v1MC3Ate075218 for ; Wed, 22 Feb 2017 12:03:10 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 217292] ipfw lookup on fields other than IP source and destination address doesn't work for IPv6 Date: Wed, 22 Feb 2017 12:03:11 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: crest@bultmann.eu X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Feb 2017 12:03:11 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217292 Bug ID: 217292 Summary: ipfw lookup on fields other than IP source and destination address doesn't work for IPv6 Product: Base System Version: 11.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: crest@bultmann.eu The ipfw lookup action allows ipfw to match the specified field in a packet against a table. I wanted to use this to dynamically allow/deny TCP and UDP ports without changing the ruleset itself. A reduced version of the ipfw script looks like this: # Create the table ipfw table tcp_open create type number algo number:array # Apply existing state ipfw add check-state # Establish new state ipfw add allow tcp from any to any lookup dst-port tcp_open keep-state setup # Open port 22/tcp ipfw table tcp_open add 22 This works as expected for IPv4, but the IPv6 code path in sys/netpfil/ipfw/ip_fw2.c:1517 can't deal with anything other than lookups = on the source/destination IPv6 address yet neither does the ipfw manpage menti= on this limitation nor does ipfw refuse to load rules which can match IPv6 pac= kets against lookup actions on fields other than the IP addresses. In my ruleset this "just" blocked all incoming IPv6 connections, but in oth= er rulesets it could just as easily expose IPv6 services to attackers. --=20 You are receiving this mail because: You are the assignee for the bug.=