* [PATCH] LOCAL_IN support for owner match
@ 2003-03-26 14:15 Patrick McHardy
2003-03-27 13:12 ` Harald Welte
0 siblings, 1 reply; 6+ messages in thread
From: Patrick McHardy @ 2003-03-26 14:15 UTC (permalink / raw)
To: marc; +Cc: Netfilter Development Mailinglist
[-- Attachment #1: Type: text/plain, Size: 509 bytes --]
Hi Marc,
this patch adds LOCAL_IN support to the owner match.
My previous patches which i sent to netfilter-devel had
problems, namely they didn't knew about tcp sockets
in TIME_WAIT state so the crashed. This one is tested
on several computers for some time and seems to work well.
I think this is a very useful feature for filtering weird protocols
like H.323 or IIOB without conntrack helpers, but also for
local user traffic accounting or similar stuff. Please consider
for inclusion.
Regards,
Patrick
[-- Attachment #2: pom-owner.diff --]
[-- Type: text/plain, Size: 7358 bytes --]
diff -urN a/extra/owner-socketlookup.patch b/extra/owner-socketlookup.patch
--- a/extra/owner-socketlookup.patch 1970-01-01 01:00:00.000000000 +0100
+++ b/extra/owner-socketlookup.patch 2003-03-26 14:29:09.000000000 +0100
@@ -0,0 +1,205 @@
+diff -urN a/include/net/tcp.h b/include/net/tcp.h
+--- a/include/net/tcp.h 2002-11-29 00:53:15.000000000 +0100
++++ b/include/net/tcp.h 2003-03-26 14:11:33.000000000 +0100
+@@ -140,6 +140,7 @@
+ extern void tcp_bucket_unlock(struct sock *sk);
+ extern int tcp_port_rover;
+ extern struct sock *tcp_v4_lookup_listener(u32 addr, unsigned short hnum, int dif);
++extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 hnum, int dif);
+
+ /* These are AF independent. */
+ static __inline__ int tcp_bhashfn(__u16 lport)
+diff -urN a/include/net/udp.h b/include/net/udp.h
+--- a/include/net/udp.h 2001-11-22 20:47:15.000000000 +0100
++++ b/include/net/udp.h 2003-03-26 14:11:33.000000000 +0100
+@@ -69,6 +69,8 @@
+ extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
+ extern int udp_disconnect(struct sock *sk, int flags);
+
++extern struct sock *udp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, int dif);
++
+ extern struct udp_mib udp_statistics[NR_CPUS*2];
+ #define UDP_INC_STATS(field) SNMP_INC_STATS(udp_statistics, field)
+ #define UDP_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_statistics, field)
+diff -urN a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c
+--- a/net/ipv4/netfilter/ipt_owner.c 2002-11-29 00:53:15.000000000 +0100
++++ b/net/ipv4/netfilter/ipt_owner.c 2003-03-26 14:26:20.000000000 +0100
+@@ -2,17 +2,25 @@
+ locally generated outgoing packets.
+
+ Copyright (C) 2000 Marc Boucher
++
++ 03/26/2003 Patrick McHardy <kaber@trash.net>: LOCAL_IN support
+ */
+ #include <linux/module.h>
+ #include <linux/skbuff.h>
+ #include <linux/file.h>
++#include <linux/ip.h>
++#include <linux/tcp.h>
++#include <linux/udp.h>
+ #include <net/sock.h>
++#include <net/tcp.h>
++#include <net/udp.h>
++#include <net/route.h>
+
+ #include <linux/netfilter_ipv4/ipt_owner.h>
+ #include <linux/netfilter_ipv4/ip_tables.h>
+
+ static int
+-match_comm(const struct sk_buff *skb, const char *comm)
++match_comm(const struct sock *sk, const char *comm)
+ {
+ struct task_struct *p;
+ struct files_struct *files;
+@@ -28,7 +36,7 @@
+ if(files) {
+ read_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+- if (fcheck_files(files, i) == skb->sk->socket->file) {
++ if (fcheck_files(files, i) == sk->socket->file) {
+ read_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+@@ -44,7 +52,7 @@
+ }
+
+ static int
+-match_pid(const struct sk_buff *skb, pid_t pid)
++match_pid(const struct sock *sk, pid_t pid)
+ {
+ struct task_struct *p;
+ struct files_struct *files;
+@@ -59,7 +67,7 @@
+ if(files) {
+ read_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+- if (fcheck_files(files, i) == skb->sk->socket->file) {
++ if (fcheck_files(files, i) == sk->socket->file) {
+ read_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+@@ -75,10 +83,10 @@
+ }
+
+ static int
+-match_sid(const struct sk_buff *skb, pid_t sid)
++match_sid(const struct sock *sk, pid_t sid)
+ {
+ struct task_struct *p;
+- struct file *file = skb->sk->socket->file;
++ struct file *file = sk->socket->file;
+ int i, found=0;
+
+ read_lock(&tasklist_lock);
+@@ -119,41 +127,71 @@
+ int *hotdrop)
+ {
+ const struct ipt_owner_info *info = matchinfo;
+-
+- if (!skb->sk || !skb->sk->socket || !skb->sk->socket->file)
+- return 0;
++ struct iphdr *iph = skb->nh.iph;
++ struct sock *sk = NULL;
++ int ret = 0;
++
++ if (out) {
++ sk = skb->sk;
++ } else {
++ if (iph->protocol == IPPROTO_TCP) {
++ struct tcphdr *tcph =
++ (struct tcphdr*)((u_int32_t*)iph + iph->ihl);
++ sk = tcp_v4_lookup(iph->saddr, tcph->source,
++ iph->daddr, tcph->dest,
++ ((struct rtable*)skb->dst)->rt_iif);
++ if (sk && sk->state == TCP_TIME_WAIT) {
++ tcp_tw_put((struct tcp_tw_bucket *)sk);
++ return ret;
++ }
++ } else if (iph->protocol == IPPROTO_UDP) {
++ struct udphdr *udph =
++ (struct udphdr*)((u_int32_t*)iph + iph->ihl);
++ sk = udp_v4_lookup(iph->saddr, udph->source, iph->daddr,
++ udph->dest, skb->dev->ifindex);
++ }
++ }
++
++ if (!sk || !sk->socket || !sk->socket->file)
++ goto out;
+
+ if(info->match & IPT_OWNER_UID) {
+- if((skb->sk->socket->file->f_uid != info->uid) ^
++ if((sk->socket->file->f_uid != info->uid) ^
+ !!(info->invert & IPT_OWNER_UID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_GID) {
+- if((skb->sk->socket->file->f_gid != info->gid) ^
++ if((sk->socket->file->f_gid != info->gid) ^
+ !!(info->invert & IPT_OWNER_GID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_PID) {
+- if (!match_pid(skb, info->pid) ^
++ if (!match_pid(sk, info->pid) ^
+ !!(info->invert & IPT_OWNER_PID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_SID) {
+- if (!match_sid(skb, info->sid) ^
++ if (!match_sid(sk, info->sid) ^
+ !!(info->invert & IPT_OWNER_SID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_COMM) {
+- if (!match_comm(skb, info->comm) ^
++ if (!match_comm(sk, info->comm) ^
+ !!(info->invert & IPT_OWNER_COMM))
+- return 0;
++ goto out;
+ }
+
+- return 1;
++ ret = 1;
++
++out:
++ if (in && sk)
++ sock_put(sk);
++
++ return ret;
+ }
+
+ static int
+@@ -164,8 +202,10 @@
+ unsigned int hook_mask)
+ {
+ if (hook_mask
+- & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
+- printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
++ & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING) |
++ (1 << NF_IP_LOCAL_IN))) {
++ printk("ipt_owner: only valid for LOCAL_IN, LOCAL_OUT "
++ "or POST_ROUTING.\n");
+ return 0;
+ }
+
+diff -urN a/net/netsyms.c b/net/netsyms.c
+--- a/net/netsyms.c 2002-11-29 00:53:16.000000000 +0100
++++ b/net/netsyms.c 2003-03-26 14:11:33.000000000 +0100
+@@ -596,4 +596,9 @@
+ EXPORT_SYMBOL(wireless_send_event);
+ #endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
+
++#if defined(CONFIG_IP_NF_MATCH_OWNER)||defined(CONFIG_IP_NF_MATCH_OWNER_MODULE)
++EXPORT_SYMBOL(tcp_v4_lookup);
++EXPORT_SYMBOL(udp_v4_lookup);
++#endif /* CONFIG_IP_NF_MATCH_OWNER */
++
+ #endif /* CONFIG_NET */
diff -urN a/extra/owner-socketlookup.patch.help b/extra/owner-socketlookup.patch.help
--- a/extra/owner-socketlookup.patch.help 1970-01-01 01:00:00.000000000 +0100
+++ b/extra/owner-socketlookup.patch.help 2003-03-26 14:23:32.000000000 +0100
@@ -0,0 +1,14 @@
+Author: Patrick McHardy <kaber@trash.net>
+Status: working
+
+The patch allows you to use the owner match in the INPUT chain to match
+properties of the receiving socket. This could be used to filter like
+those "personal firewalls", but is mainly intended to help filter weird
+protocols like H.323 or IIOB without conntrack helpers.
+
+Example:
+
+ # Allow packets on eth0 to sockets owned by local user gnugk
+
+ iptables -A INPUT -i eth0 -m owner --uid-owner gnugk -j ACCEPT
+
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] LOCAL_IN support for owner match
2003-03-26 14:15 [PATCH] LOCAL_IN support for owner match Patrick McHardy
@ 2003-03-27 13:12 ` Harald Welte
2003-03-27 14:02 ` Patrick McHardy
2003-03-27 14:49 ` [UPDATED PATCH] " Patrick McHardy
0 siblings, 2 replies; 6+ messages in thread
From: Harald Welte @ 2003-03-27 13:12 UTC (permalink / raw)
To: Patrick McHardy; +Cc: marc, Netfilter Development Mailinglist
[-- Attachment #1: Type: text/plain, Size: 1088 bytes --]
On Wed, Mar 26, 2003 at 03:15:43PM +0100, Patrick McHardy wrote:
> Hi Marc,
>
> this patch adds LOCAL_IN support to the owner match.
makes sense.
> My previous patches which i sent to netfilter-devel had
> problems, namely they didn't knew about tcp sockets
> in TIME_WAIT state so the crashed. This one is tested
> on several computers for some time and seems to work well.
After a quick read through the code, it seems like your implementation
works only for udp and tcp sockets.
In this case, you should make sure that the owner match in INPUT can
only be used if the match did contain '-p udp' or '-p tcp'.
To see example code on how to do so: ECN/DSCP target.
> Regards,
> Patrick
--
- Harald Welte <laforge@netfilter.org> http://www.netfilter.org/
============================================================================
"Fragmentation is like classful addressing -- an interesting early
architectural error that shows how much experimentation was going
on while IP was being designed." -- Paul Vixie
[-- Attachment #2: Type: application/pgp-signature, Size: 232 bytes --]
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] LOCAL_IN support for owner match
2003-03-27 13:12 ` Harald Welte
@ 2003-03-27 14:02 ` Patrick McHardy
2003-03-27 14:21 ` Patrick McHardy
2003-03-27 14:49 ` [UPDATED PATCH] " Patrick McHardy
1 sibling, 1 reply; 6+ messages in thread
From: Patrick McHardy @ 2003-03-27 14:02 UTC (permalink / raw)
To: Harald Welte; +Cc: marc, Netfilter Development Mailinglist
Harald Welte wrote:
>After a quick read through the code, it seems like your implementation
>works only for udp and tcp sockets.
>
>In this case, you should make sure that the owner match in INPUT can
>only be used if the match did contain '-p udp' or '-p tcp'.
>
>
i assumed the original owner match would only work with tcp/udp, too.
after the discussion about raw sockets i guess it does also work with
raw sockets. would it be acceptable to extend it further to work
with raw-sockets, too ?
Regards,
Patrick
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] LOCAL_IN support for owner match
2003-03-27 14:02 ` Patrick McHardy
@ 2003-03-27 14:21 ` Patrick McHardy
0 siblings, 0 replies; 6+ messages in thread
From: Patrick McHardy @ 2003-03-27 14:21 UTC (permalink / raw)
To: Harald Welte; +Cc: marc, Netfilter Development Mailinglist
Patrick McHardy wrote:
> Harald Welte wrote:
>
>> After a quick read through the code, it seems like your implementation
>> works only for udp and tcp sockets.
>>
>> In this case, you should make sure that the owner match in INPUT can
>> only be used if the match did contain '-p udp' or '-p tcp'.
>
>
> i assumed the original owner match would only work with tcp/udp, too.
> after the discussion about raw sockets i guess it does also work with
> raw sockets. would it be acceptable to extend it further to work
> with raw-sockets, too ?
This was probably one of my stupidest ideas lately ;)
i'm going to make the changes you suggested and post it again.
Thanks,
Patrick
^ permalink raw reply [flat|nested] 6+ messages in thread
* [UPDATED PATCH] LOCAL_IN support for owner match
2003-03-27 13:12 ` Harald Welte
2003-03-27 14:02 ` Patrick McHardy
@ 2003-03-27 14:49 ` Patrick McHardy
2003-04-01 11:44 ` Patrick McHardy
1 sibling, 1 reply; 6+ messages in thread
From: Patrick McHardy @ 2003-03-27 14:49 UTC (permalink / raw)
To: Harald Welte; +Cc: marc, Netfilter Development Mailinglist
[-- Attachment #1: Type: text/plain, Size: 241 bytes --]
Harald Welte wrote:
>In this case, you should make sure that the owner match in INPUT can
>only be used if the match did contain '-p udp' or '-p tcp'.
>
Done, this version checks for proto = TCP / UDP if used in LOCAL_IN.
Regards,
Patrick
[-- Attachment #2: pom-owner.diff --]
[-- Type: text/plain, Size: 7637 bytes --]
diff -urN a/extra/owner-socketlookup.patch b/extra/owner-socketlookup.patch
--- a/extra/owner-socketlookup.patch 1970-01-01 01:00:00.000000000 +0100
+++ b/extra/owner-socketlookup.patch 2003-03-27 15:43:36.000000000 +0100
@@ -0,0 +1,214 @@
+diff -urN a/include/net/tcp.h b/include/net/tcp.h
+--- a/include/net/tcp.h 2002-11-29 00:53:15.000000000 +0100
++++ b/include/net/tcp.h 2003-03-27 15:33:45.000000000 +0100
+@@ -140,6 +140,7 @@
+ extern void tcp_bucket_unlock(struct sock *sk);
+ extern int tcp_port_rover;
+ extern struct sock *tcp_v4_lookup_listener(u32 addr, unsigned short hnum, int dif);
++extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 hnum, int dif);
+
+ /* These are AF independent. */
+ static __inline__ int tcp_bhashfn(__u16 lport)
+diff -urN a/include/net/udp.h b/include/net/udp.h
+--- a/include/net/udp.h 2001-11-22 20:47:15.000000000 +0100
++++ b/include/net/udp.h 2003-03-27 15:33:45.000000000 +0100
+@@ -69,6 +69,8 @@
+ extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
+ extern int udp_disconnect(struct sock *sk, int flags);
+
++extern struct sock *udp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, int dif);
++
+ extern struct udp_mib udp_statistics[NR_CPUS*2];
+ #define UDP_INC_STATS(field) SNMP_INC_STATS(udp_statistics, field)
+ #define UDP_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_statistics, field)
+diff -urN a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c
+--- a/net/ipv4/netfilter/ipt_owner.c 2002-11-29 00:53:15.000000000 +0100
++++ b/net/ipv4/netfilter/ipt_owner.c 2003-03-27 15:38:46.000000000 +0100
+@@ -2,17 +2,25 @@
+ locally generated outgoing packets.
+
+ Copyright (C) 2000 Marc Boucher
++
++ 03/26/2003 Patrick McHardy <kaber@trash.net>: LOCAL_IN support
+ */
+ #include <linux/module.h>
+ #include <linux/skbuff.h>
+ #include <linux/file.h>
++#include <linux/ip.h>
++#include <linux/tcp.h>
++#include <linux/udp.h>
+ #include <net/sock.h>
++#include <net/tcp.h>
++#include <net/udp.h>
++#include <net/route.h>
+
+ #include <linux/netfilter_ipv4/ipt_owner.h>
+ #include <linux/netfilter_ipv4/ip_tables.h>
+
+ static int
+-match_comm(const struct sk_buff *skb, const char *comm)
++match_comm(const struct sock *sk, const char *comm)
+ {
+ struct task_struct *p;
+ struct files_struct *files;
+@@ -28,7 +36,7 @@
+ if(files) {
+ read_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+- if (fcheck_files(files, i) == skb->sk->socket->file) {
++ if (fcheck_files(files, i) == sk->socket->file) {
+ read_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+@@ -44,7 +52,7 @@
+ }
+
+ static int
+-match_pid(const struct sk_buff *skb, pid_t pid)
++match_pid(const struct sock *sk, pid_t pid)
+ {
+ struct task_struct *p;
+ struct files_struct *files;
+@@ -59,7 +67,7 @@
+ if(files) {
+ read_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+- if (fcheck_files(files, i) == skb->sk->socket->file) {
++ if (fcheck_files(files, i) == sk->socket->file) {
+ read_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+@@ -75,10 +83,10 @@
+ }
+
+ static int
+-match_sid(const struct sk_buff *skb, pid_t sid)
++match_sid(const struct sock *sk, pid_t sid)
+ {
+ struct task_struct *p;
+- struct file *file = skb->sk->socket->file;
++ struct file *file = sk->socket->file;
+ int i, found=0;
+
+ read_lock(&tasklist_lock);
+@@ -119,41 +127,71 @@
+ int *hotdrop)
+ {
+ const struct ipt_owner_info *info = matchinfo;
+-
+- if (!skb->sk || !skb->sk->socket || !skb->sk->socket->file)
+- return 0;
++ struct iphdr *iph = skb->nh.iph;
++ struct sock *sk = NULL;
++ int ret = 0;
++
++ if (out) {
++ sk = skb->sk;
++ } else {
++ if (iph->protocol == IPPROTO_TCP) {
++ struct tcphdr *tcph =
++ (struct tcphdr*)((u_int32_t*)iph + iph->ihl);
++ sk = tcp_v4_lookup(iph->saddr, tcph->source,
++ iph->daddr, tcph->dest,
++ ((struct rtable*)skb->dst)->rt_iif);
++ if (sk && sk->state == TCP_TIME_WAIT) {
++ tcp_tw_put((struct tcp_tw_bucket *)sk);
++ return ret;
++ }
++ } else if (iph->protocol == IPPROTO_UDP) {
++ struct udphdr *udph =
++ (struct udphdr*)((u_int32_t*)iph + iph->ihl);
++ sk = udp_v4_lookup(iph->saddr, udph->source, iph->daddr,
++ udph->dest, skb->dev->ifindex);
++ }
++ }
++
++ if (!sk || !sk->socket || !sk->socket->file)
++ goto out;
+
+ if(info->match & IPT_OWNER_UID) {
+- if((skb->sk->socket->file->f_uid != info->uid) ^
++ if((sk->socket->file->f_uid != info->uid) ^
+ !!(info->invert & IPT_OWNER_UID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_GID) {
+- if((skb->sk->socket->file->f_gid != info->gid) ^
++ if((sk->socket->file->f_gid != info->gid) ^
+ !!(info->invert & IPT_OWNER_GID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_PID) {
+- if (!match_pid(skb, info->pid) ^
++ if (!match_pid(sk, info->pid) ^
+ !!(info->invert & IPT_OWNER_PID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_SID) {
+- if (!match_sid(skb, info->sid) ^
++ if (!match_sid(sk, info->sid) ^
+ !!(info->invert & IPT_OWNER_SID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_COMM) {
+- if (!match_comm(skb, info->comm) ^
++ if (!match_comm(sk, info->comm) ^
+ !!(info->invert & IPT_OWNER_COMM))
+- return 0;
++ goto out;
+ }
+
+- return 1;
++ ret = 1;
++
++out:
++ if (in && sk)
++ sock_put(sk);
++
++ return ret;
+ }
+
+ static int
+@@ -164,11 +202,19 @@
+ unsigned int hook_mask)
+ {
+ if (hook_mask
+- & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
+- printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
++ & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING) |
++ (1 << NF_IP_LOCAL_IN))) {
++ printk("ipt_owner: only valid for LOCAL_IN, LOCAL_OUT "
++ "or POST_ROUTING.\n");
+ return 0;
+ }
+
++ if ((hook_mask & (1 << NF_IP_LOCAL_IN))
++ && ip->proto != IPPROTO_TCP && ip->proto != IPPROTO_UDP) {
++ printk("ipt_owner: only TCP or UDP can be used in LOCAL_IN\n");
++ return 0;
++ }
++
+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_owner_info)))
+ return 0;
+
+diff -urN a/net/netsyms.c b/net/netsyms.c
+--- a/net/netsyms.c 2002-11-29 00:53:16.000000000 +0100
++++ b/net/netsyms.c 2003-03-27 15:33:45.000000000 +0100
+@@ -596,4 +596,9 @@
+ EXPORT_SYMBOL(wireless_send_event);
+ #endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
+
++#if defined(CONFIG_IP_NF_MATCH_OWNER)||defined(CONFIG_IP_NF_MATCH_OWNER_MODULE)
++EXPORT_SYMBOL(tcp_v4_lookup);
++EXPORT_SYMBOL(udp_v4_lookup);
++#endif /* CONFIG_IP_NF_MATCH_OWNER */
++
+ #endif /* CONFIG_NET */
diff -urN a/extra/owner-socketlookup.patch.help b/extra/owner-socketlookup.patch.help
--- a/extra/owner-socketlookup.patch.help 1970-01-01 01:00:00.000000000 +0100
+++ b/extra/owner-socketlookup.patch.help 2003-03-27 15:44:29.000000000 +0100
@@ -0,0 +1,14 @@
+Author: Patrick McHardy <kaber@trash.net>
+Status: working
+
+The patch allows you to use the owner match in the INPUT chain to match
+properties of the receiving socket. This could be used to filter like
+those "personal firewalls", but is mainly intended to help filter weird
+protocols like H.323 or IIOB without conntrack helpers.
+
+Example:
+
+ # Allow packets on eth0 to sockets owned by local user gnugk
+
+ iptables -A INPUT -i eth0 -m owner --uid-owner gnugk -j ACCEPT
+
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [UPDATED PATCH] LOCAL_IN support for owner match
2003-03-27 14:49 ` [UPDATED PATCH] " Patrick McHardy
@ 2003-04-01 11:44 ` Patrick McHardy
0 siblings, 0 replies; 6+ messages in thread
From: Patrick McHardy @ 2003-04-01 11:44 UTC (permalink / raw)
To: Harald Welte; +Cc: marc, Netfilter Development Mailinglist
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Hi Harald,
you already stated this addition would make sense. Do you have any further
objections ? The last patch didn't contain updated usage information, i've
attached it again.
Best regards,
Patrick
Patrick McHardy wrote:
> Harald Welte wrote:
>
>> In this case, you should make sure that the owner match in INPUT can
>> only be used if the match did contain '-p udp' or '-p tcp'.
>>
> Done, this version checks for proto = TCP / UDP if used in LOCAL_IN.
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diff -urN a/extra/owner-socketlookup.patch b/extra/owner-socketlookup.patch
--- a/extra/owner-socketlookup.patch 1970-01-01 01:00:00.000000000 +0100
+++ b/extra/owner-socketlookup.patch 2003-04-01 13:34:08.000000000 +0200
@@ -0,0 +1,214 @@
+diff -urN a/include/net/tcp.h b/include/net/tcp.h
+--- a/include/net/tcp.h 2002-11-29 00:53:15.000000000 +0100
++++ b/include/net/tcp.h 2003-03-27 15:33:45.000000000 +0100
+@@ -140,6 +140,7 @@
+ extern void tcp_bucket_unlock(struct sock *sk);
+ extern int tcp_port_rover;
+ extern struct sock *tcp_v4_lookup_listener(u32 addr, unsigned short hnum, int dif);
++extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 hnum, int dif);
+
+ /* These are AF independent. */
+ static __inline__ int tcp_bhashfn(__u16 lport)
+diff -urN a/include/net/udp.h b/include/net/udp.h
+--- a/include/net/udp.h 2001-11-22 20:47:15.000000000 +0100
++++ b/include/net/udp.h 2003-03-27 15:33:45.000000000 +0100
+@@ -69,6 +69,8 @@
+ extern int udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
+ extern int udp_disconnect(struct sock *sk, int flags);
+
++extern struct sock *udp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, int dif);
++
+ extern struct udp_mib udp_statistics[NR_CPUS*2];
+ #define UDP_INC_STATS(field) SNMP_INC_STATS(udp_statistics, field)
+ #define UDP_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_statistics, field)
+diff -urN a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c
+--- a/net/ipv4/netfilter/ipt_owner.c 2002-11-29 00:53:15.000000000 +0100
++++ b/net/ipv4/netfilter/ipt_owner.c 2003-03-27 15:38:46.000000000 +0100
+@@ -2,17 +2,25 @@
+ locally generated outgoing packets.
+
+ Copyright (C) 2000 Marc Boucher
++
++ 03/26/2003 Patrick McHardy <kaber@trash.net>: LOCAL_IN support
+ */
+ #include <linux/module.h>
+ #include <linux/skbuff.h>
+ #include <linux/file.h>
++#include <linux/ip.h>
++#include <linux/tcp.h>
++#include <linux/udp.h>
+ #include <net/sock.h>
++#include <net/tcp.h>
++#include <net/udp.h>
++#include <net/route.h>
+
+ #include <linux/netfilter_ipv4/ipt_owner.h>
+ #include <linux/netfilter_ipv4/ip_tables.h>
+
+ static int
+-match_comm(const struct sk_buff *skb, const char *comm)
++match_comm(const struct sock *sk, const char *comm)
+ {
+ struct task_struct *p;
+ struct files_struct *files;
+@@ -28,7 +36,7 @@
+ if(files) {
+ read_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+- if (fcheck_files(files, i) == skb->sk->socket->file) {
++ if (fcheck_files(files, i) == sk->socket->file) {
+ read_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+@@ -44,7 +52,7 @@
+ }
+
+ static int
+-match_pid(const struct sk_buff *skb, pid_t pid)
++match_pid(const struct sock *sk, pid_t pid)
+ {
+ struct task_struct *p;
+ struct files_struct *files;
+@@ -59,7 +67,7 @@
+ if(files) {
+ read_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+- if (fcheck_files(files, i) == skb->sk->socket->file) {
++ if (fcheck_files(files, i) == sk->socket->file) {
+ read_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+@@ -75,10 +83,10 @@
+ }
+
+ static int
+-match_sid(const struct sk_buff *skb, pid_t sid)
++match_sid(const struct sock *sk, pid_t sid)
+ {
+ struct task_struct *p;
+- struct file *file = skb->sk->socket->file;
++ struct file *file = sk->socket->file;
+ int i, found=0;
+
+ read_lock(&tasklist_lock);
+@@ -119,41 +127,71 @@
+ int *hotdrop)
+ {
+ const struct ipt_owner_info *info = matchinfo;
+-
+- if (!skb->sk || !skb->sk->socket || !skb->sk->socket->file)
+- return 0;
++ struct iphdr *iph = skb->nh.iph;
++ struct sock *sk = NULL;
++ int ret = 0;
++
++ if (out) {
++ sk = skb->sk;
++ } else {
++ if (iph->protocol == IPPROTO_TCP) {
++ struct tcphdr *tcph =
++ (struct tcphdr*)((u_int32_t*)iph + iph->ihl);
++ sk = tcp_v4_lookup(iph->saddr, tcph->source,
++ iph->daddr, tcph->dest,
++ ((struct rtable*)skb->dst)->rt_iif);
++ if (sk && sk->state == TCP_TIME_WAIT) {
++ tcp_tw_put((struct tcp_tw_bucket *)sk);
++ return ret;
++ }
++ } else if (iph->protocol == IPPROTO_UDP) {
++ struct udphdr *udph =
++ (struct udphdr*)((u_int32_t*)iph + iph->ihl);
++ sk = udp_v4_lookup(iph->saddr, udph->source, iph->daddr,
++ udph->dest, skb->dev->ifindex);
++ }
++ }
++
++ if (!sk || !sk->socket || !sk->socket->file)
++ goto out;
+
+ if(info->match & IPT_OWNER_UID) {
+- if((skb->sk->socket->file->f_uid != info->uid) ^
++ if((sk->socket->file->f_uid != info->uid) ^
+ !!(info->invert & IPT_OWNER_UID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_GID) {
+- if((skb->sk->socket->file->f_gid != info->gid) ^
++ if((sk->socket->file->f_gid != info->gid) ^
+ !!(info->invert & IPT_OWNER_GID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_PID) {
+- if (!match_pid(skb, info->pid) ^
++ if (!match_pid(sk, info->pid) ^
+ !!(info->invert & IPT_OWNER_PID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_SID) {
+- if (!match_sid(skb, info->sid) ^
++ if (!match_sid(sk, info->sid) ^
+ !!(info->invert & IPT_OWNER_SID))
+- return 0;
++ goto out;
+ }
+
+ if(info->match & IPT_OWNER_COMM) {
+- if (!match_comm(skb, info->comm) ^
++ if (!match_comm(sk, info->comm) ^
+ !!(info->invert & IPT_OWNER_COMM))
+- return 0;
++ goto out;
+ }
+
+- return 1;
++ ret = 1;
++
++out:
++ if (in && sk)
++ sock_put(sk);
++
++ return ret;
+ }
+
+ static int
+@@ -164,11 +202,19 @@
+ unsigned int hook_mask)
+ {
+ if (hook_mask
+- & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
+- printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
++ & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING) |
++ (1 << NF_IP_LOCAL_IN))) {
++ printk("ipt_owner: only valid for LOCAL_IN, LOCAL_OUT "
++ "or POST_ROUTING.\n");
+ return 0;
+ }
+
++ if ((hook_mask & (1 << NF_IP_LOCAL_IN))
++ && ip->proto != IPPROTO_TCP && ip->proto != IPPROTO_UDP) {
++ printk("ipt_owner: only TCP or UDP can be used in LOCAL_IN\n");
++ return 0;
++ }
++
+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_owner_info)))
+ return 0;
+
+diff -urN a/net/netsyms.c b/net/netsyms.c
+--- a/net/netsyms.c 2002-11-29 00:53:16.000000000 +0100
++++ b/net/netsyms.c 2003-03-27 15:33:45.000000000 +0100
+@@ -596,4 +596,9 @@
+ EXPORT_SYMBOL(wireless_send_event);
+ #endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
+
++#if defined(CONFIG_IP_NF_MATCH_OWNER)||defined(CONFIG_IP_NF_MATCH_OWNER_MODULE)
++EXPORT_SYMBOL(tcp_v4_lookup);
++EXPORT_SYMBOL(udp_v4_lookup);
++#endif /* CONFIG_IP_NF_MATCH_OWNER */
++
+ #endif /* CONFIG_NET */
diff -urN a/extra/owner-socketlookup.patch.help b/extra/owner-socketlookup.patch.help
--- a/extra/owner-socketlookup.patch.help 1970-01-01 01:00:00.000000000 +0100
+++ b/extra/owner-socketlookup.patch.help 2003-04-01 13:41:17.000000000 +0200
@@ -0,0 +1,18 @@
+Author: Patrick McHardy <kaber@trash.net>
+Status: working
+
+The patch allows you to use the owner match in the INPUT chain to match
+properties of the receiving socket. It is mainly intended to help filter weird
+protocols like H.323 or IIOB without conntrack helpers, but could also come
+handy for local user traffic accounting and similar stuff.
+
+Usage:
+ iptables -A INPUT -m udp/tcp -m owner ...
+
+Example:
+
+ # Allow packets on eth0 to sockets owned by local user gnugk
+
+ iptables -A INPUT -i eth0 -p udp -m owner --uid-owner gnugk -j ACCEPT
+ iptables -A INPUT -i eth0 -p tcp -m owner --uid-owner gnugk -j ACCEPT
+
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-04-01 11:44 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2003-03-26 14:15 [PATCH] LOCAL_IN support for owner match Patrick McHardy
2003-03-27 13:12 ` Harald Welte
2003-03-27 14:02 ` Patrick McHardy
2003-03-27 14:21 ` Patrick McHardy
2003-03-27 14:49 ` [UPDATED PATCH] " Patrick McHardy
2003-04-01 11:44 ` Patrick McHardy
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