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audit: add netlink audit protocol bind to check capabilities on multicast join

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Register a netlink per-protocol bind fuction for audit to check userspace
process capabilities before allowing a multicast group connection.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Guy Briggs
2014-04-22 21:31:56 -04:00
committed by David S. Miller
parent 7774d5e03f
commit 3a101b8de0
3 changed files with 17 additions and 2 deletions
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kernel/audit.c
+10
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@@ -1076,10 +1076,20 @@ static void audit_receive(struct sk_buff *skb)
mutex_unlock(&audit_cmd_mutex);
}
/* Run custom bind function on netlink socket group connect or bind requests. */
static int audit_bind(int group)
{
if (!capable(CAP_AUDIT_READ))
return -EPERM;
return 0;
}
static int __net_init audit_net_init(struct net *net)
{
struct netlink_kernel_cfg cfg = {
.input = audit_receive,
.bind = audit_bind,
};
struct audit_net *aunet = net_generic(net, audit_net_id);