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[NETFILTER] nfnetlink: unconditionally require CAP_NET_ADMIN

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This patch unconditionally requires CAP_NET_ADMIN for all nfnetlink
messages.  It also removes the per-message cap_required field, since all
existing subsystems use CAP_NET_ADMIN for all their messages anyway.

Patrick McHardy owes me a beer if we ever need to re-introduce this.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harald Welte
2005-11-14 15:24:59 -08:00
committed by David S. Miller
parent 3746a2b140
commit 37d2e7a20d
5 changed files with 24 additions and 41 deletions
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28
net/netfilter/nfnetlink.c
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@@ -223,6 +223,12 @@ static inline int nfnetlink_rcv_msg(struct sk_buff *skb,
NFNL_SUBSYS_ID(nlh->nlmsg_type),
NFNL_MSG_TYPE(nlh->nlmsg_type));
if (!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) {
DEBUGP("missing CAP_NET_ADMIN\n");
*errp = -EPERM;
return -1;
}
/* Only requests are handled by kernel now. */
if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) {
DEBUGP("received non-request message\n");
@@ -240,15 +246,12 @@ static inline int nfnetlink_rcv_msg(struct sk_buff *skb,
ss = nfnetlink_get_subsys(type);
if (!ss) {
#ifdef CONFIG_KMOD
if (cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) {
/* don't call nfnl_shunlock, since it would reenter
* with further packet processing */
up(&nfnl_sem);
request_module("nfnetlink-subsys-%d",
NFNL_SUBSYS_ID(type));
nfnl_shlock();
ss = nfnetlink_get_subsys(type);
}
/* don't call nfnl_shunlock, since it would reenter
* with further packet processing */
up(&nfnl_sem);
request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
nfnl_shlock();
ss = nfnetlink_get_subsys(type);
if (!ss)
#endif
goto err_inval;
@@ -260,13 +263,6 @@ static inline int nfnetlink_rcv_msg(struct sk_buff *skb,
goto err_inval;
}
if (nc->cap_required &&
!cap_raised(NETLINK_CB(skb).eff_cap, nc->cap_required)) {
DEBUGP("permission denied for type %d\n", type);
*errp = -EPERM;
return -1;
}
{
u_int16_t attr_count =
ss->cb[NFNL_MSG_TYPE(nlh->nlmsg_type)].attr_count;