Date: Fri, 30 Dec 2005 06:47:00 GMT From: Christian Ullrich <chris@chrullrich.de> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/91082: ipfilter rule changes fail in securelevel 2 Message-ID: <200512300647.jBU6l0kg093335@www.freebsd.org> Resent-Message-ID: <200512300650.jBU6o2RC067022@freefall.freebsd.org>
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>Number: 91082
>Category: kern
>Synopsis: ipfilter rule changes fail in securelevel 2
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Dec 30 06:50:01 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Christian Ullrich
>Release: 6.0-STABLE
>Organization:
>Environment:
FreeBSD legolas.chrullrich.de 6.0-STABLE FreeBSD 6.0-STABLE #0: Wed Dec 28 19:11:05 CET 2005 root@wt.chrullrich.de:/usr/obj/usr/src/sys/LEGOLAS i386
>Description:
On FreeBSD 6.0, modifying ipfilter rule sets is disallowed in any securelevel >= 2. This behavior differs from earlier releases, the init(8) man page, and the requirements for changing ipnat rules, which are allowed up to securelevel 2.
Release 3 of ipfilter initially required securelevel < 2 for rule changes as well, which was changed in revision 1.28 of src/sys/contrib/ipfilter/netinet/ip_fil.c, back in 2002.
In FreeBSD 6, ipfilter 3 has been replaced by release 4, which, again, requires the lower securelevel. As noted above, that applies only to changes to filtering rules, not NAT rules.
>How-To-Repeat:
In securelevel 2, run anything which will change ipf filter rules.
>Fix:
--- sys/contrib/ipfilter/netinet/ip_fil_freebsd.c.orig Fri Dec 30 07:40:18 2005
+++ sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Fri Dec 30 07:40:40 2005
@@ -421,7 +421,7 @@
friostat_t fio;
#if (BSD >= 199306) && defined(_KERNEL)
- if ((securelevel >= 2) && (mode & FWRITE))
+ if ((securelevel >= 3) && (mode & FWRITE))
return EPERM;
#endif
>Release-Note:
>Audit-Trail:
>Unformatted:
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