diff options
| author | Roman Kubiak <r.kubiak@samsung.com> | 2015-06-12 12:32:57 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-06-18 13:02:24 +0200 |
| commit | ef493bd930ae482c608c5999b40d79dda3f2a674 (patch) | |
| tree | f411c73a50e8c3f8d46182f7b0710114152744aa | |
| parent | 89d256bb69f2596c3a31ac51466eac9e1791c388 (diff) | |
netfilter: nfnetlink_queue: add security context information
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>
| -rw-r--r-- | include/uapi/linux/netfilter/nfnetlink_queue.h | 4 | ||||
| -rw-r--r-- | net/netfilter/nfnetlink_queue_core.c | 35 |
2 files changed, 37 insertions, 2 deletions
diff --git a/include/uapi/linux/netfilter/nfnetlink_queue.h b/include/uapi/linux/netfilter/nfnetlink_queue.h index 8dd819e2b5fe..b67a853638ff 100644 --- a/include/uapi/linux/netfilter/nfnetlink_queue.h +++ b/include/uapi/linux/netfilter/nfnetlink_queue.h @@ -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 */ diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c index 22a5ac76683e..6eccf0fcdc63 100644 --- a/net/netfilter/nfnetlink_queue_core.c +++ b/net/netfilter/nfnetlink_queue_core.c @@ -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; |