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net/netfilter/xt_owner.c
2.8 KB
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/* * Kernel module to match various things tied to sockets associated with * locally generated outgoing packets. * * (C) 2000 Marc Boucher <marc@mbsi.ca> * |
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* Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
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* * 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> |
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static int owner_check(const struct xt_mtchk_param *par) { struct xt_owner_match_info *info = par->matchinfo; /* For now only allow adding matches from the initial user namespace */ if ((info->match & (XT_OWNER_UID|XT_OWNER_GID)) && (current_user_ns() != &init_user_ns)) return -EINVAL; return 0; } |
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static bool |
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owner_mt(const struct sk_buff *skb, struct xt_action_param *par) |
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{ |
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const struct xt_owner_match_info *info = par->matchinfo; |
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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; |
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if (info->match & XT_OWNER_UID) { kuid_t uid_min = make_kuid(&init_user_ns, info->uid_min); kuid_t uid_max = make_kuid(&init_user_ns, info->uid_max); if ((uid_gte(filp->f_cred->fsuid, uid_min) && uid_lte(filp->f_cred->fsuid, uid_max)) ^ |
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!(info->invert & XT_OWNER_UID)) |
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return false; |
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} |
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if (info->match & XT_OWNER_GID) { kgid_t gid_min = make_kgid(&init_user_ns, info->gid_min); kgid_t gid_max = make_kgid(&init_user_ns, info->gid_max); if ((gid_gte(filp->f_cred->fsgid, gid_min) && gid_lte(filp->f_cred->fsgid, gid_max)) ^ |
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!(info->invert & XT_OWNER_GID)) |
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return false; |
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} |
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return true; } |
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static struct xt_match owner_mt_reg __read_mostly = { .name = "owner", .revision = 1, .family = NFPROTO_UNSPEC, |
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.checkentry = owner_check, |
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.match = owner_mt, .matchsize = sizeof(struct xt_owner_match_info), .hooks = (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_POST_ROUTING), .me = THIS_MODULE, |
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}; static int __init owner_mt_init(void) { |
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return xt_register_match(&owner_mt_reg); |
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} static void __exit owner_mt_exit(void) { |
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xt_unregister_match(&owner_mt_reg); |
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} module_init(owner_mt_init); module_exit(owner_mt_exit); |
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MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
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MODULE_DESCRIPTION("Xtables: socket owner matching"); |
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MODULE_LICENSE("GPL"); MODULE_ALIAS("ipt_owner"); MODULE_ALIAS("ip6t_owner"); |