![Jan Engelhardt](/assets/img/avatar_default.png)
Lots of extensions are completely family-independent, so squash some code. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
189 lines
4.8 KiB
C
189 lines
4.8 KiB
C
/*
|
|
* Kernel module to match various things tied to sockets associated with
|
|
* locally generated outgoing packets.
|
|
*
|
|
* (C) 2000 Marc Boucher <marc@mbsi.ca>
|
|
*
|
|
* Copyright © CC Computer Consultants GmbH, 2007 - 2008
|
|
* <jengelh@computergmbh.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/file.h>
|
|
#include <net/sock.h>
|
|
#include <linux/netfilter/x_tables.h>
|
|
#include <linux/netfilter/xt_owner.h>
|
|
#include <linux/netfilter_ipv4/ipt_owner.h>
|
|
#include <linux/netfilter_ipv6/ip6t_owner.h>
|
|
|
|
static bool
|
|
owner_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct ipt_owner_info *info = par->matchinfo;
|
|
const struct file *filp;
|
|
|
|
if (skb->sk == NULL || skb->sk->sk_socket == NULL)
|
|
return false;
|
|
|
|
filp = skb->sk->sk_socket->file;
|
|
if (filp == NULL)
|
|
return false;
|
|
|
|
if (info->match & IPT_OWNER_UID)
|
|
if ((filp->f_uid != info->uid) ^
|
|
!!(info->invert & IPT_OWNER_UID))
|
|
return false;
|
|
|
|
if (info->match & IPT_OWNER_GID)
|
|
if ((filp->f_gid != info->gid) ^
|
|
!!(info->invert & IPT_OWNER_GID))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
owner_mt6_v0(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct ip6t_owner_info *info = par->matchinfo;
|
|
const struct file *filp;
|
|
|
|
if (skb->sk == NULL || skb->sk->sk_socket == NULL)
|
|
return false;
|
|
|
|
filp = skb->sk->sk_socket->file;
|
|
if (filp == NULL)
|
|
return false;
|
|
|
|
if (info->match & IP6T_OWNER_UID)
|
|
if ((filp->f_uid != info->uid) ^
|
|
!!(info->invert & IP6T_OWNER_UID))
|
|
return false;
|
|
|
|
if (info->match & IP6T_OWNER_GID)
|
|
if ((filp->f_gid != info->gid) ^
|
|
!!(info->invert & IP6T_OWNER_GID))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
owner_mt(const struct sk_buff *skb, const struct xt_match_param *par)
|
|
{
|
|
const struct xt_owner_match_info *info = par->matchinfo;
|
|
const struct file *filp;
|
|
|
|
if (skb->sk == NULL || skb->sk->sk_socket == NULL)
|
|
return (info->match ^ info->invert) == 0;
|
|
else if (info->match & info->invert & XT_OWNER_SOCKET)
|
|
/*
|
|
* Socket exists but user wanted ! --socket-exists.
|
|
* (Single ampersands intended.)
|
|
*/
|
|
return false;
|
|
|
|
filp = skb->sk->sk_socket->file;
|
|
if (filp == NULL)
|
|
return ((info->match ^ info->invert) &
|
|
(XT_OWNER_UID | XT_OWNER_GID)) == 0;
|
|
|
|
if (info->match & XT_OWNER_UID)
|
|
if ((filp->f_uid >= info->uid_min &&
|
|
filp->f_uid <= info->uid_max) ^
|
|
!(info->invert & XT_OWNER_UID))
|
|
return false;
|
|
|
|
if (info->match & XT_OWNER_GID)
|
|
if ((filp->f_gid >= info->gid_min &&
|
|
filp->f_gid <= info->gid_max) ^
|
|
!(info->invert & XT_OWNER_GID))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool owner_mt_check_v0(const struct xt_mtchk_param *par)
|
|
{
|
|
const struct ipt_owner_info *info = par->matchinfo;
|
|
|
|
if (info->match & (IPT_OWNER_PID | IPT_OWNER_SID | IPT_OWNER_COMM)) {
|
|
printk(KERN_WARNING KBUILD_MODNAME
|
|
": PID, SID and command matching is not "
|
|
"supported anymore\n");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool owner_mt6_check_v0(const struct xt_mtchk_param *par)
|
|
{
|
|
const struct ip6t_owner_info *info = par->matchinfo;
|
|
|
|
if (info->match & (IP6T_OWNER_PID | IP6T_OWNER_SID)) {
|
|
printk(KERN_WARNING KBUILD_MODNAME
|
|
": PID and SID matching is not supported anymore\n");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static struct xt_match owner_mt_reg[] __read_mostly = {
|
|
{
|
|
.name = "owner",
|
|
.revision = 0,
|
|
.family = NFPROTO_IPV4,
|
|
.match = owner_mt_v0,
|
|
.matchsize = sizeof(struct ipt_owner_info),
|
|
.checkentry = owner_mt_check_v0,
|
|
.hooks = (1 << NF_INET_LOCAL_OUT) |
|
|
(1 << NF_INET_POST_ROUTING),
|
|
.me = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "owner",
|
|
.revision = 0,
|
|
.family = NFPROTO_IPV6,
|
|
.match = owner_mt6_v0,
|
|
.matchsize = sizeof(struct ip6t_owner_info),
|
|
.checkentry = owner_mt6_check_v0,
|
|
.hooks = (1 << NF_INET_LOCAL_OUT) |
|
|
(1 << NF_INET_POST_ROUTING),
|
|
.me = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "owner",
|
|
.revision = 1,
|
|
.family = NFPROTO_UNSPEC,
|
|
.match = owner_mt,
|
|
.matchsize = sizeof(struct xt_owner_match_info),
|
|
.hooks = (1 << NF_INET_LOCAL_OUT) |
|
|
(1 << NF_INET_POST_ROUTING),
|
|
.me = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init owner_mt_init(void)
|
|
{
|
|
return xt_register_matches(owner_mt_reg, ARRAY_SIZE(owner_mt_reg));
|
|
}
|
|
|
|
static void __exit owner_mt_exit(void)
|
|
{
|
|
xt_unregister_matches(owner_mt_reg, ARRAY_SIZE(owner_mt_reg));
|
|
}
|
|
|
|
module_init(owner_mt_init);
|
|
module_exit(owner_mt_exit);
|
|
MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>");
|
|
MODULE_DESCRIPTION("Xtables: socket owner matching");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("ipt_owner");
|
|
MODULE_ALIAS("ip6t_owner");
|