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1 | /* |
2 | * Kernel module to match various things tied to sockets associated with |
3 | * locally generated outgoing packets. |
4 | * |
5 | * (C) 2000 Marc Boucher <marc@mbsi.ca> |
6 | * |
7 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as |
11 | * published by the Free Software Foundation. |
12 | */ |
13 | #include <linux/module.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/file.h> |
16 | #include <net/sock.h> |
17 | #include <linux/netfilter/x_tables.h> |
18 | #include <linux/netfilter/xt_owner.h> |
19 | |
20 | static bool |
21 | owner_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
22 | { |
23 | const struct xt_owner_match_info *info = par->matchinfo; |
24 | const struct file *filp; |
25 | |
26 | if (skb->sk == NULL || skb->sk->sk_socket == NULL) |
27 | return (info->match ^ info->invert) == 0; |
28 | else if (info->match & info->invert & XT_OWNER_SOCKET) |
29 | /* |
30 | * Socket exists but user wanted ! --socket-exists. |
31 | * (Single ampersands intended.) |
32 | */ |
33 | return false; |
34 | |
35 | filp = skb->sk->sk_socket->file; |
36 | if (filp == NULL) |
37 | return ((info->match ^ info->invert) & |
38 | (XT_OWNER_UID | XT_OWNER_GID)) == 0; |
39 | |
40 | if (info->match & XT_OWNER_UID) |
41 | if ((filp->f_cred->fsuid >= info->uid_min && |
42 | filp->f_cred->fsuid <= info->uid_max) ^ |
43 | !(info->invert & XT_OWNER_UID)) |
44 | return false; |
45 | |
46 | if (info->match & XT_OWNER_GID) |
47 | if ((filp->f_cred->fsgid >= info->gid_min && |
48 | filp->f_cred->fsgid <= info->gid_max) ^ |
49 | !(info->invert & XT_OWNER_GID)) |
50 | return false; |
51 | |
52 | return true; |
53 | } |
54 | |
55 | static struct xt_match owner_mt_reg __read_mostly = { |
56 | .name = "owner", |
57 | .revision = 1, |
58 | .family = NFPROTO_UNSPEC, |
59 | .match = owner_mt, |
60 | .matchsize = sizeof(struct xt_owner_match_info), |
61 | .hooks = (1 << NF_INET_LOCAL_OUT) | |
62 | (1 << NF_INET_POST_ROUTING), |
63 | .me = THIS_MODULE, |
64 | }; |
65 | |
66 | static int __init owner_mt_init(void) |
67 | { |
68 | return xt_register_match(&owner_mt_reg); |
69 | } |
70 | |
71 | static void __exit owner_mt_exit(void) |
72 | { |
73 | xt_unregister_match(&owner_mt_reg); |
74 | } |
75 | |
76 | module_init(owner_mt_init); |
77 | module_exit(owner_mt_exit); |
78 | MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); |
79 | MODULE_DESCRIPTION("Xtables: socket owner matching"); |
80 | MODULE_LICENSE("GPL"); |
81 | MODULE_ALIAS("ipt_owner"); |
82 | MODULE_ALIAS("ip6t_owner"); |
83 |
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