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netfilter: ebtables: enforce CAP_NET_ADMIN

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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@astaro.com>
Cc: stable@kernel.org
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Florian Westphal 2010-01-08 17:31:24 +01:00 committed by Patrick McHardy
parent aaff23a95a
commit dce766af54
1 changed files with 6 additions and 0 deletions
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6
net/bridge/netfilter/ebtables.c
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@ -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;