Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| 8 | */ |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 9 | |
| 10 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/errno.h> |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/socket.h> |
| 14 | #include <linux/in.h> |
| 15 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/timer.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/sockios.h> |
| 19 | #include <linux/net.h> |
| 20 | #include <linux/spinlock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <net/ax25.h> |
| 23 | #include <linux/inet.h> |
| 24 | #include <linux/netdevice.h> |
| 25 | #include <linux/if_arp.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | #include <net/sock.h> |
| 28 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/fcntl.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/interrupt.h> |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 32 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/notifier.h> |
| 34 | #include <linux/proc_fs.h> |
| 35 | #include <linux/seq_file.h> |
| 36 | #include <linux/stat.h> |
| 37 | #include <linux/netfilter.h> |
| 38 | #include <linux/sysctl.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 39 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <net/ip.h> |
| 41 | #include <net/arp.h> |
| 42 | |
| 43 | /* |
| 44 | * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines. |
| 45 | */ |
| 46 | |
Eric Dumazet | f16f302 | 2008-01-13 22:29:41 -0800 | [diff] [blame] | 47 | static HLIST_HEAD(ax25_uid_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | static DEFINE_RWLOCK(ax25_uid_lock); |
| 49 | |
Eric Dumazet | f16f302 | 2008-01-13 22:29:41 -0800 | [diff] [blame] | 50 | int ax25_uid_policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Ralf Baechle | 70868ea | 2006-05-03 23:25:17 -0700 | [diff] [blame] | 52 | EXPORT_SYMBOL(ax25_uid_policy); |
| 53 | |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 54 | ax25_uid_assoc *ax25_findbyuid(kuid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 56 | ax25_uid_assoc *ax25_uid, *res = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | read_lock(&ax25_uid_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame^] | 59 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 60 | if (uid_eq(ax25_uid->uid, uid)) { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 61 | ax25_uid_hold(ax25_uid); |
| 62 | res = ax25_uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | break; |
| 64 | } |
| 65 | } |
| 66 | read_unlock(&ax25_uid_lock); |
| 67 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 68 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | |
Ralf Baechle | 70868ea | 2006-05-03 23:25:17 -0700 | [diff] [blame] | 71 | EXPORT_SYMBOL(ax25_findbyuid); |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) |
| 74 | { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 75 | ax25_uid_assoc *ax25_uid; |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 76 | ax25_uid_assoc *user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | unsigned long res; |
| 78 | |
| 79 | switch (cmd) { |
| 80 | case SIOCAX25GETUID: |
| 81 | res = -ENOENT; |
| 82 | read_lock(&ax25_uid_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame^] | 83 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 85 | res = from_kuid_munged(current_user_ns(), ax25_uid->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | break; |
| 87 | } |
| 88 | } |
| 89 | read_unlock(&ax25_uid_lock); |
| 90 | |
| 91 | return res; |
| 92 | |
| 93 | case SIOCAX25ADDUID: |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 94 | { |
| 95 | kuid_t sax25_kuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | if (!capable(CAP_NET_ADMIN)) |
| 97 | return -EPERM; |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 98 | sax25_kuid = make_kuid(current_user_ns(), sax->sax25_uid); |
| 99 | if (!uid_valid(sax25_kuid)) |
| 100 | return -EINVAL; |
| 101 | user = ax25_findbyuid(sax25_kuid); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 102 | if (user) { |
| 103 | ax25_uid_put(user); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return -EEXIST; |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 105 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | if (sax->sax25_uid == 0) |
| 107 | return -EINVAL; |
| 108 | if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) |
| 109 | return -ENOMEM; |
| 110 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 111 | atomic_set(&ax25_uid->refcount, 1); |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 112 | ax25_uid->uid = sax25_kuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | ax25_uid->call = sax->sax25_call; |
| 114 | |
| 115 | write_lock(&ax25_uid_lock); |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 116 | hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | write_unlock(&ax25_uid_lock); |
| 118 | |
| 119 | return 0; |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 120 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | case SIOCAX25DELUID: |
| 122 | if (!capable(CAP_NET_ADMIN)) |
| 123 | return -EPERM; |
| 124 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 125 | ax25_uid = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | write_lock(&ax25_uid_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame^] | 127 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 128 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | if (ax25_uid == NULL) { |
| 132 | write_unlock(&ax25_uid_lock); |
| 133 | return -ENOENT; |
| 134 | } |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 135 | hlist_del_init(&ax25_uid->uid_node); |
| 136 | ax25_uid_put(ax25_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | write_unlock(&ax25_uid_lock); |
| 138 | |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 139 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | default: |
| 142 | return -EINVAL; |
| 143 | } |
| 144 | |
| 145 | return -EINVAL; /*NOTREACHED */ |
| 146 | } |
| 147 | |
| 148 | #ifdef CONFIG_PROC_FS |
| 149 | |
| 150 | static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | f16f302 | 2008-01-13 22:29:41 -0800 | [diff] [blame] | 151 | __acquires(ax25_uid_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | read_lock(&ax25_uid_lock); |
Li Zefan | b512f3d | 2010-02-08 23:19:59 +0000 | [diff] [blame] | 154 | return seq_hlist_start_head(&ax25_uid_list, *pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 158 | { |
Li Zefan | b512f3d | 2010-02-08 23:19:59 +0000 | [diff] [blame] | 159 | return seq_hlist_next(v, &ax25_uid_list, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | static void ax25_uid_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | f16f302 | 2008-01-13 22:29:41 -0800 | [diff] [blame] | 163 | __releases(ax25_uid_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
| 165 | read_unlock(&ax25_uid_lock); |
| 166 | } |
| 167 | |
| 168 | static int ax25_uid_seq_show(struct seq_file *seq, void *v) |
| 169 | { |
Ralf Baechle | f75268c | 2005-09-06 15:49:39 -0700 | [diff] [blame] | 170 | char buf[11]; |
| 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | if (v == SEQ_START_TOKEN) |
| 173 | seq_printf(seq, "Policy: %d\n", ax25_uid_policy); |
| 174 | else { |
Li Zefan | b512f3d | 2010-02-08 23:19:59 +0000 | [diff] [blame] | 175 | struct ax25_uid_assoc *pt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Li Zefan | b512f3d | 2010-02-08 23:19:59 +0000 | [diff] [blame] | 177 | pt = hlist_entry(v, struct ax25_uid_assoc, uid_node); |
Eric W. Biederman | d13fda8 | 2012-05-24 12:55:00 -0600 | [diff] [blame] | 178 | seq_printf(seq, "%6d %s\n", |
| 179 | from_kuid_munged(seq_user_ns(seq), pt->uid), |
| 180 | ax2asc(buf, &pt->call)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | } |
| 182 | return 0; |
| 183 | } |
| 184 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 185 | static const struct seq_operations ax25_uid_seqops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | .start = ax25_uid_seq_start, |
| 187 | .next = ax25_uid_seq_next, |
| 188 | .stop = ax25_uid_seq_stop, |
| 189 | .show = ax25_uid_seq_show, |
| 190 | }; |
| 191 | |
| 192 | static int ax25_uid_info_open(struct inode *inode, struct file *file) |
| 193 | { |
| 194 | return seq_open(file, &ax25_uid_seqops); |
| 195 | } |
| 196 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 197 | const struct file_operations ax25_uid_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | .owner = THIS_MODULE, |
| 199 | .open = ax25_uid_info_open, |
| 200 | .read = seq_read, |
| 201 | .llseek = seq_lseek, |
| 202 | .release = seq_release, |
| 203 | }; |
| 204 | |
| 205 | #endif |
| 206 | |
| 207 | /* |
| 208 | * Free all memory associated with UID/Callsign structures. |
| 209 | */ |
| 210 | void __exit ax25_uid_free(void) |
| 211 | { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 212 | ax25_uid_assoc *ax25_uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | write_lock(&ax25_uid_lock); |
Pavel Emelyanov | ae1b6a3 | 2008-04-12 18:33:50 -0700 | [diff] [blame] | 215 | again: |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame^] | 216 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
Ralf Baechle | 01d7dd0 | 2005-08-23 10:11:45 -0700 | [diff] [blame] | 217 | hlist_del_init(&ax25_uid->uid_node); |
| 218 | ax25_uid_put(ax25_uid); |
Pavel Emelyanov | ae1b6a3 | 2008-04-12 18:33:50 -0700 | [diff] [blame] | 219 | goto again; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | write_unlock(&ax25_uid_lock); |
| 222 | } |