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netfilter: nfnetlink_queue: add security context information

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This patch adds an additional attribute when sending
packet information via netlink in netfilter_queue module.
It will send additional security context data, so that
userspace applications can verify this context against
their own security databases.

Signed-off-by: Roman Kubiak <r.kubiak@samsung.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Roman Kubiak 2015-06-12 12:32:57 +02:00 committed by Pablo Neira Ayuso
parent 89d256bb69
commit ef493bd930
2 changed files with 37 additions and 2 deletions
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4
include/uapi/linux/netfilter/nfnetlink_queue.h
View File

@ -49,6 +49,7 @@ enum nfqnl_attr_type {
NFQA_EXP, /* nf_conntrack_netlink.h */
NFQA_UID, /* __u32 sk uid */
NFQA_GID, /* __u32 sk gid */
NFQA_SECCTX, /* security context string */
__NFQA_MAX
};
@ -102,7 +103,8 @@ enum nfqnl_attr_config {
#define NFQA_CFG_F_CONNTRACK (1 << 1)
#define NFQA_CFG_F_GSO (1 << 2)
#define NFQA_CFG_F_UID_GID (1 << 3)
#define NFQA_CFG_F_MAX (1 << 4)
#define NFQA_CFG_F_SECCTX (1 << 4)
#define NFQA_CFG_F_MAX (1 << 5)
/* flags for NFQA_SKB_INFO */
/* packet appears to have wrong checksums, but they are ok */

35
net/netfilter/nfnetlink_queue_core.c
View File

@ -278,6 +278,23 @@ nla_put_failure:
return -1;
}
static u32 nfqnl_get_sk_secctx(struct sk_buff *skb, char **secdata)
{
u32 seclen = 0;
#if IS_ENABLED(CONFIG_NETWORK_SECMARK)
if (!skb || !sk_fullsock(skb->sk))
return 0;
read_lock_bh(&skb->sk->sk_callback_lock);
if (skb->secmark)
security_secid_to_secctx(skb->secmark, secdata, &seclen);
read_unlock_bh(&skb->sk->sk_callback_lock);
#endif
return seclen;
}
static struct sk_buff *
nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
struct nf_queue_entry *entry,
@ -297,6 +314,8 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
struct nf_conn *ct = NULL;
enum ip_conntrack_info uninitialized_var(ctinfo);
bool csum_verify;
char *secdata = NULL;
u32 seclen = 0;
size = nlmsg_total_size(sizeof(struct nfgenmsg))
+ nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
@ -352,6 +371,12 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
+ nla_total_size(sizeof(u_int32_t))); /* gid */
}
if ((queue->flags & NFQA_CFG_F_SECCTX) && entskb->sk) {
seclen = nfqnl_get_sk_secctx(entskb, &secdata);
if (seclen)
size += nla_total_size(seclen);
}
skb = nfnetlink_alloc_skb(net, size, queue->peer_portid,
GFP_ATOMIC);
if (!skb) {
@ -479,6 +504,9 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue,
nfqnl_put_sk_uidgid(skb, entskb->sk) < 0)
goto nla_put_failure;
if (seclen && nla_put(skb, NFQA_SECCTX, seclen, secdata))
goto nla_put_failure;
if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0)
goto nla_put_failure;
@ -1142,7 +1170,12 @@ nfqnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
ret = -EOPNOTSUPP;
goto err_out_unlock;
}
#if !IS_ENABLED(CONFIG_NETWORK_SECMARK)
if (flags & mask & NFQA_CFG_F_SECCTX) {
ret = -EOPNOTSUPP;
goto err_out_unlock;
}
#endif
spin_lock_bh(&queue->lock);
queue->flags &= ~mask;
queue->flags |= flags & mask;