linux-kernel - [4/9] netfilter: ebtables: enforce CAP_NET

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Message-Id: <20100114224806.743281302@mini.kroah.org>
Date:	Thu, 14 Jan 2010 14:46:40 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Florian Westphal <fwestphal@...aro.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: [4/9] netfilter: ebtables: enforce CAP_NET_ADMIN

2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Florian Westphal <fwestphal@...aro.com>

commit dce766af541f6605fa9889892c0280bab31c66ab upstream.

normal users are currently allowed to set/modify ebtables rules.
Restrict it to processes with CAP_NET_ADMIN.

Note that this cannot be reproduced with unmodified ebtables binary
because it uses SOCK_RAW.

Signed-off-by: Florian Westphal <fwestphal@...aro.com>
Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/bridge/netfilter/ebtables.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1405,6 +1405,9 @@ static int do_ebt_set_ctl(struct sock *s
 {
 	int ret;
 
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
 	switch(cmd) {
 	case EBT_SO_SET_ENTRIES:
 		ret = do_replace(sock_net(sk), user, len);
@@ -1424,6 +1427,9 @@ static int do_ebt_get_ctl(struct sock *s
 	struct ebt_replace tmp;
 	struct ebt_table *t;
 
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
 	if (copy_from_user(&tmp, user, sizeof(tmp)))
 		return -EFAULT;
 


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