Date: Mon, 14 May 2001 22:21:18 +0700 From: Igor Podlesny <poige@morning.ru> To: Peter Pentchev <roam@orbitel.bg> Cc: freebsd-security@FreeBSD.ORG Subject: Re[2]: ipfw rules and securelevel Message-ID: <5523460344.20010514222118@morning.ru> In-Reply-To: <20010514170927.A849@ringworld.oblivion.bg> References: <Pine.LNX.4.33.0105141802230.18115-100000@apsara.barc.ernet.in> <10320318256.20010514212856@morning.ru> <19322552168.20010514220610@morning.ru> <20010514170927.A849@ringworld.oblivion.bg>
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> On Mon, May 14, 2001 at 10:06:10PM +0700, Igor Podlesny wrote:
>>
>> >> Dear friends,
>> >> Even in securelevel 3 I can bypass ipfw rules. In securelevel 3 I
>> >> as root can change the variable "net.inet.ip.fw.enable" using sysctl. When
>> >> I run a command
>>
>> >> sysctl -w net.inet.ip.fw.enable=0
>>
>> >> It disables the ipfw rules.
>>
>> >> Is it a feature or hole in freebsd.
>>
>> > doesn't matter how it is called, only matters how it hurts... (it does)
>>
>> >> please help
>>
>> the "patch" (hard to call it a patch, but nevertheless) is adding
>> CTLFLAG_SECURE to the relevant definition of the node:
>>
>> this diff out is for 3.5 stable:
>>
>> 92c92
>> < SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, enable, CTLFLAG_RW,
>> ---
>> > SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, enable, CTLFLAG_RW|CTLFLAG_SECURE,
> Patches/diffs are usually much easier to review and apply if they are
> in context or unified diff format - this helps when the patch is made
> against a possibly changed file :) And.. well.. it might be obvious
> to you (in this case it's pretty obvious to figure out ;), but still
> it helps a lot to mention which file(s) the patch is against :)
oh, you're right :)
it was
/usr/src/sys/netinet/ip_fw.c
unified diff:
--- /usr/src/sys/netinet/ip_fw.c.orig Fri Mar 23 19:44:27 2001
+++ /usr/src/sys/netinet/ip_fw.c Mon May 14 22:15:55 2001
@@ -89,7 +89,7 @@
#ifdef SYSCTL_NODE
SYSCTL_NODE(_net_inet_ip, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall");
-SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, enable, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, enable, CTLFLAG_RW|CTLFLAG_SECURE,
&fw_enable, 0, "Enable ipfw");
SYSCTL_INT(_net_inet_ip_fw, OID_AUTO,one_pass,CTLFLAG_RW,
&fw_one_pass, 0,
> G'luck,
> Peter
--
Igor mailto:poige@morning.ru
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