From 0265ab44bacc1a1e0e3f5873d8ca2d5a29e33db2 Mon Sep 17 00:00:00 2001 From: Jan Engelhardt Date: Tue, 4 Dec 2007 23:27:38 -0800 Subject: [NETFILTER]: merge ipt_owner/ip6t_owner in xt_owner xt_owner merges ipt_owner and ip6t_owner, and adds a flag to match on socket (non-)existence. Signed-off-by: Jan Engelhardt Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild index b87e83a..1e69002 100644 --- a/include/linux/netfilter/Kbuild +++ b/include/linux/netfilter/Kbuild @@ -26,6 +26,7 @@ header-y += xt_limit.h header-y += xt_mac.h header-y += xt_mark.h header-y += xt_multiport.h +header-y += xt_owner.h header-y += xt_pkttype.h header-y += xt_policy.h header-y += xt_realm.h diff --git a/include/linux/netfilter/xt_owner.h b/include/linux/netfilter/xt_owner.h new file mode 100644 index 0000000..eacd34e --- /dev/null +++ b/include/linux/netfilter/xt_owner.h @@ -0,0 +1,16 @@ +#ifndef _XT_OWNER_MATCH_H +#define _XT_OWNER_MATCH_H + +enum { + XT_OWNER_UID = 1 << 0, + XT_OWNER_GID = 1 << 1, + XT_OWNER_SOCKET = 1 << 2, +}; + +struct xt_owner_match_info { + u_int32_t uid; + u_int32_t gid; + u_int8_t match, invert; +}; + +#endif /* _XT_OWNER_MATCH_H */ diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index 9aca9c5..6c563d9 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -111,15 +111,6 @@ config IP_NF_MATCH_TTL To compile it as a module, choose M here. If unsure, say N. -config IP_NF_MATCH_OWNER - tristate "Owner match support" - depends on IP_NF_IPTABLES - help - Packet owner matching allows you to match locally-generated packets - based on who created them: the user, group, process or session. - - To compile it as a module, choose M here. If unsure, say N. - config IP_NF_MATCH_ADDRTYPE tristate 'address type match support' depends on IP_NF_IPTABLES diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index 7456833..42199e9 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -45,7 +45,6 @@ obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o obj-$(CONFIG_IP_NF_MATCH_IPRANGE) += ipt_iprange.o -obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o diff --git a/net/ipv4/netfilter/ipt_owner.c b/net/ipv4/netfilter/ipt_owner.c deleted file mode 100644 index 4f1aa89..0000000 --- a/net/ipv4/netfilter/ipt_owner.c +++ /dev/null @@ -1,87 +0,0 @@ -/* Kernel module to match various things tied to sockets associated with - locally generated outgoing packets. */ - -/* (C) 2000 Marc Boucher - * - * 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 -#include -#include -#include -#include - -#include -#include - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Marc Boucher "); -MODULE_DESCRIPTION("iptables owner match"); - -static bool -owner_mt(const struct sk_buff *skb, const struct net_device *in, - const struct net_device *out, const struct xt_match *match, - const void *matchinfo, int offset, unsigned int protoff, - bool *hotdrop) -{ - const struct ipt_owner_info *info = matchinfo; - - if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) - return false; - - if(info->match & IPT_OWNER_UID) { - if ((skb->sk->sk_socket->file->f_uid != info->uid) ^ - !!(info->invert & IPT_OWNER_UID)) - return false; - } - - if(info->match & IPT_OWNER_GID) { - if ((skb->sk->sk_socket->file->f_gid != info->gid) ^ - !!(info->invert & IPT_OWNER_GID)) - return false; - } - - return true; -} - -static bool -owner_mt_check(const char *tablename, const void *ip, - const struct xt_match *match, void *matchinfo, - unsigned int hook_mask) -{ - const struct ipt_owner_info *info = matchinfo; - - if (info->match & (IPT_OWNER_PID|IPT_OWNER_SID|IPT_OWNER_COMM)) { - printk("ipt_owner: pid, sid and command matching " - "not supported anymore\n"); - return false; - } - return true; -} - -static struct xt_match owner_mt_reg __read_mostly = { - .name = "owner", - .family = AF_INET, - .match = owner_mt, - .matchsize = sizeof(struct ipt_owner_info), - .hooks = (1 << NF_INET_LOCAL_OUT) | - (1 << NF_INET_POST_ROUTING), - .checkentry = owner_mt_check, - .me = THIS_MODULE, -}; - -static int __init owner_mt_init(void) -{ - return xt_register_match(&owner_mt_reg); -} - -static void __exit owner_mt_exit(void) -{ - xt_unregister_match(&owner_mt_reg); -} - -module_init(owner_mt_init); -module_exit(owner_mt_exit); diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig index 838b8dd..30d4852 100644 --- a/net/ipv6/netfilter/Kconfig +++ b/net/ipv6/netfilter/Kconfig @@ -89,15 +89,6 @@ config IP6_NF_MATCH_HL To compile it as a module, choose M here. If unsure, say N. -config IP6_NF_MATCH_OWNER - tristate "Owner match support" - depends on IP6_NF_IPTABLES - help - Packet owner matching allows you to match locally-generated packets - based on who created them: the user, group, process or session. - - To compile it as a module, choose M here. If unsure, say N. - config IP6_NF_MATCH_IPV6HEADER tristate "IPv6 Extension Headers Match" depends on IP6_NF_IPTABLES diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile index e789ec4..fbf2c14 100644 --- a/net/ipv6/netfilter/Makefile +++ b/net/ipv6/netfilter/Makefile @@ -23,7 +23,6 @@ obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o obj-$(CONFIG_IP6_NF_MATCH_IPV6HEADER) += ip6t_ipv6header.o obj-$(CONFIG_IP6_NF_MATCH_MH) += ip6t_mh.o obj-$(CONFIG_IP6_NF_MATCH_OPTS) += ip6t_hbh.o -obj-$(CONFIG_IP6_NF_MATCH_OWNER) += ip6t_owner.o obj-$(CONFIG_IP6_NF_MATCH_RT) += ip6t_rt.o # targets diff --git a/net/ipv6/netfilter/ip6t_owner.c b/net/ipv6/netfilter/ip6t_owner.c deleted file mode 100644 index 6a52ed9..0000000 --- a/net/ipv6/netfilter/ip6t_owner.c +++ /dev/null @@ -1,87 +0,0 @@ -/* Kernel module to match various things tied to sockets associated with - locally generated outgoing packets. */ - -/* (C) 2000-2001 Marc Boucher - * - * 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 -#include -#include -#include -#include - -#include -#include -#include - -MODULE_AUTHOR("Marc Boucher "); -MODULE_DESCRIPTION("IP6 tables owner matching module"); -MODULE_LICENSE("GPL"); - - -static bool -owner_mt6(const struct sk_buff *skb, const struct net_device *in, - const struct net_device *out, const struct xt_match *match, - const void *matchinfo, int offset, unsigned int protoff, - bool *hotdrop) -{ - const struct ip6t_owner_info *info = matchinfo; - - if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file) - return false; - - if (info->match & IP6T_OWNER_UID) - if ((skb->sk->sk_socket->file->f_uid != info->uid) ^ - !!(info->invert & IP6T_OWNER_UID)) - return false; - - if (info->match & IP6T_OWNER_GID) - if ((skb->sk->sk_socket->file->f_gid != info->gid) ^ - !!(info->invert & IP6T_OWNER_GID)) - return false; - - return true; -} - -static bool -owner_mt6_check(const char *tablename, const void *ip, - const struct xt_match *match, void *matchinfo, - unsigned int hook_mask) -{ - const struct ip6t_owner_info *info = matchinfo; - - if (info->match & (IP6T_OWNER_PID | IP6T_OWNER_SID)) { - printk("ipt_owner: pid and sid matching " - "not supported anymore\n"); - return false; - } - return true; -} - -static struct xt_match owner_mt6_reg __read_mostly = { - .name = "owner", - .family = AF_INET6, - .match = owner_mt6, - .matchsize = sizeof(struct ip6t_owner_info), - .hooks = (1 << NF_INET_LOCAL_OUT) | - (1 << NF_INET_POST_ROUTING), - .checkentry = owner_mt6_check, - .me = THIS_MODULE, -}; - -static int __init owner_mt6_init(void) -{ - return xt_register_match(&owner_mt6_reg); -} - -static void __exit owner_mt6_exit(void) -{ - xt_unregister_match(&owner_mt6_reg); -} - -module_init(owner_mt6_init); -module_exit(owner_mt6_exit); diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 693f861..4bc0552 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -554,6 +554,14 @@ config NETFILTER_XT_MATCH_MARK To compile it as a module, choose M here. If unsure, say N. +config NETFILTER_XT_MATCH_OWNER + tristate '"owner" match support' + depends on NETFILTER_XTABLES + ---help--- + Socket owner matching allows you to match locally-generated packets + based on who created the socket: the user or group. It is also + possible to check whether a socket actually exists. + config NETFILTER_XT_MATCH_POLICY tristate 'IPsec "policy" match support' depends on NETFILTER_XTABLES && XFRM diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 7763dea..28f59a35 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o obj-$(CONFIG_NETFILTER_XT_MATCH_MULTIPORT) += xt_multiport.o +obj-$(CONFIG_NETFILTER_XT_MATCH_OWNER) += xt_owner.o obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o diff --git a/net/netfilter/xt_owner.c b/net/netfilter/xt_owner.c new file mode 100644 index 0000000..4222fa2 --- /dev/null +++ b/net/netfilter/xt_owner.c @@ -0,0 +1,211 @@ +/* + * Kernel module to match various things tied to sockets associated with + * locally generated outgoing packets. + * + * (C) 2000 Marc Boucher + * + * Copyright © CC Computer Consultants GmbH, 2007 + * Contact: + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +static bool +owner_mt_v0(const struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, const struct xt_match *match, + const void *matchinfo, int offset, unsigned int protoff, + bool *hotdrop) +{ + const struct ipt_owner_info *info = 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 net_device *in, + const struct net_device *out, const struct xt_match *match, + const void *matchinfo, int offset, unsigned int protoff, + bool *hotdrop) +{ + const struct ip6t_owner_info *info = 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 net_device *in, + const struct net_device *out, const struct xt_match *match, + const void *matchinfo, int offset, unsigned int protoff, + bool *hotdrop) +{ + const struct xt_owner_match_info *info = 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) ^ + !!(info->invert & XT_OWNER_UID)) + return false; + + if (info->match & XT_OWNER_GID) + if ((filp->f_gid != info->gid) ^ + !!(info->invert & XT_OWNER_GID)) + return false; + + return true; +} + +static bool +owner_mt_check_v0(const char *tablename, const void *ip, + const struct xt_match *match, void *matchinfo, + unsigned int hook_mask) +{ + const struct ipt_owner_info *info = 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 char *tablename, const void *ip, + const struct xt_match *match, void *matchinfo, + unsigned int hook_mask) +{ + const struct ip6t_owner_info *info = 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 = AF_INET, + .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 = AF_INET6, + .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 = AF_INET, + .match = owner_mt, + .matchsize = sizeof(struct xt_owner_match_info), + .hooks = (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING), + .me = THIS_MODULE, + }, + { + .name = "owner", + .revision = 1, + .family = AF_INET6, + .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 "); +MODULE_DESCRIPTION("netfilter \"owner\" match module"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_owner"); +MODULE_ALIAS("ip6t_owner"); -- cgit v0.10.2