[PATCH 33/52] netfilter: ebtables: enforce CAP_NET_ADMIN
From: Greg Kroah-Hartman
Date: Thu Jan 14 2010 - 17:29:00 EST
From: Florian Westphal <fwestphal@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
net/bridge/netfilter/ebtables.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index bd1c654..0b7f262 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1406,6 +1406,9 @@ static int do_ebt_set_ctl(struct sock *sk,
{
int ret;
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
switch(cmd) {
case EBT_SO_SET_ENTRIES:
ret = do_replace(sock_net(sk), user, len);
@@ -1425,6 +1428,9 @@ static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
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;
--
1.6.6
--
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