| Message ID | 1387556934-7372-2-git-send-email-valentina.giusti@bmw-carit.de |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | David Miller |
| Headers | show |
On Fri, Dec 20, 2013 at 05:28:53PM +0100, valentina.giusti@bmw-carit.de wrote: > From: Valentina Giusti <valentina.giusti@bmw-carit.de> > > Thanks to commits 41063e9 (ipv4: Early TCP socket demux) and 421b388 (udp: ipv4: > Add udp early demux) it is now possible to parse UID and GID socket info > also for incoming TCP and UDP connections. Having this info available, it > is convenient to let NFQUEUE parse it in order to improve and refine the > traffic analysis in userspace. Applied the kernel patch, wait for a new patch for libnetfilter_queue. Thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 12/23/2013 03:21 PM, Pablo Neira Ayuso wrote: > On Fri, Dec 20, 2013 at 05:28:53PM +0100, valentina.giusti@bmw-carit.de wrote: >> From: Valentina Giusti <valentina.giusti@bmw-carit.de> >> >> Thanks to commits 41063e9 (ipv4: Early TCP socket demux) and 421b388 (udp: ipv4: >> Add udp early demux) it is now possible to parse UID and GID socket info >> also for incoming TCP and UDP connections. Having this info available, it >> is convenient to let NFQUEUE parse it in order to improve and refine the >> traffic analysis in userspace. > > Applied the kernel patch, wait for a new patch for libnetfilter_queue. Thanks. > Hi Pablo, thanks for applying the kernel patch and also for the comments on the userspace patch, I'll send a new patch that addresses them ASAP. Sorry for the delay, I was away during the past 2 weeks. BR, - Val -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/include/uapi/linux/netfilter/nfnetlink_queue.h b/include/uapi/linux/netfilter/nfnetlink_queue.h index 0132bad..8dd819e 100644 --- a/include/uapi/linux/netfilter/nfnetlink_queue.h +++ b/include/uapi/linux/netfilter/nfnetlink_queue.h @@ -47,6 +47,8 @@ enum nfqnl_attr_type { NFQA_CAP_LEN, /* __u32 length of captured packet */ NFQA_SKB_INFO, /* __u32 skb meta information */ NFQA_EXP, /* nf_conntrack_netlink.h */ + NFQA_UID, /* __u32 sk uid */ + NFQA_GID, /* __u32 sk gid */ __NFQA_MAX }; @@ -99,7 +101,8 @@ enum nfqnl_attr_config { #define NFQA_CFG_F_FAIL_OPEN (1 << 0) #define NFQA_CFG_F_CONNTRACK (1 << 1) #define NFQA_CFG_F_GSO (1 << 2) -#define NFQA_CFG_F_MAX (1 << 3) +#define NFQA_CFG_F_UID_GID (1 << 3) +#define NFQA_CFG_F_MAX (1 << 4) /* 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 21258cf..267ac36 100644 --- a/net/netfilter/nfnetlink_queue_core.c +++ b/net/netfilter/nfnetlink_queue_core.c @@ -297,6 +297,32 @@ nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, return flags ? nla_put_be32(nlskb, NFQA_SKB_INFO, htonl(flags)) : 0; } +static int nfqnl_put_sk_uidgid(struct sk_buff *skb, struct sock *sk) +{ + const struct cred *cred; + + if (sk->sk_state == TCP_TIME_WAIT) + return 0; + + read_lock_bh(&sk->sk_callback_lock); + if (sk->sk_socket && sk->sk_socket->file) { + cred = sk->sk_socket->file->f_cred; + if (nla_put_be32(skb, NFQA_UID, + htonl(from_kuid_munged(&init_user_ns, cred->fsuid)))) + goto nla_put_failure; + if (nla_put_be32(skb, NFQA_GID, + htonl(from_kgid_munged(&init_user_ns, cred->fsgid)))) + goto nla_put_failure; + } + read_unlock_bh(&sk->sk_callback_lock); + + return 0; + +nla_put_failure: + read_unlock_bh(&sk->sk_callback_lock); + return -1; +} + static struct sk_buff * nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, struct nf_queue_entry *entry, @@ -372,6 +398,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, if (queue->flags & NFQA_CFG_F_CONNTRACK) ct = nfqnl_ct_get(entskb, &size, &ctinfo); + if (queue->flags & NFQA_CFG_F_UID_GID) + size += (nla_total_size(sizeof(u_int32_t)) /* uid */ + + nla_total_size(sizeof(u_int32_t))); /* gid */ + skb = nfnetlink_alloc_skb(net, size, queue->peer_portid, GFP_ATOMIC); if (!skb) @@ -484,6 +514,10 @@ nfqnl_build_packet_message(struct net *net, struct nfqnl_instance *queue, goto nla_put_failure; } + if ((queue->flags & NFQA_CFG_F_UID_GID) && entskb->sk) + if (nfqnl_put_sk_uidgid(skb, entskb->sk)) + goto nla_put_failure; + if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) goto nla_put_failure;