Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * Authors: |
| 9 | * Casey Schaufler <casey@schaufler-ca.com> |
| 10 | * Ahmed S. Darwish <darwish.07@gmail.com> |
| 11 | * |
| 12 | * Special thanks to the authors of selinuxfs. |
| 13 | * |
| 14 | * Karl MacMillan <kmacmillan@tresys.com> |
| 15 | * James Morris <jmorris@redhat.com> |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/vmalloc.h> |
| 21 | #include <linux/security.h> |
| 22 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 23 | #include <linux/slab.h> |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 24 | #include <net/net_namespace.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 25 | #include <net/netlabel.h> |
| 26 | #include <net/cipso_ipv4.h> |
| 27 | #include <linux/seq_file.h> |
| 28 | #include <linux/ctype.h> |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 29 | #include <linux/audit.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 30 | #include "smack.h" |
| 31 | |
| 32 | /* |
| 33 | * smackfs pseudo filesystem. |
| 34 | */ |
| 35 | |
| 36 | enum smk_inos { |
| 37 | SMK_ROOT_INO = 2, |
| 38 | SMK_LOAD = 3, /* load policy */ |
| 39 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ |
| 40 | SMK_DOI = 5, /* CIPSO DOI */ |
| 41 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ |
| 42 | SMK_AMBIENT = 7, /* internet ambient label */ |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 43 | SMK_NETLBLADDR = 8, /* single label hosts */ |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 44 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 45 | SMK_LOGGING = 10, /* logging */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 46 | }; |
| 47 | |
| 48 | /* |
| 49 | * List locks |
| 50 | */ |
| 51 | static DEFINE_MUTEX(smack_list_lock); |
| 52 | static DEFINE_MUTEX(smack_cipso_lock); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 53 | static DEFINE_MUTEX(smack_ambient_lock); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 54 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 55 | |
| 56 | /* |
| 57 | * This is the "ambient" label for network traffic. |
| 58 | * If it isn't somehow marked, use this. |
| 59 | * It can be reset via smackfs/ambient |
| 60 | */ |
| 61 | char *smack_net_ambient = smack_known_floor.smk_known; |
| 62 | |
| 63 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 64 | * This is the level in a CIPSO header that indicates a |
| 65 | * smack label is contained directly in the category set. |
| 66 | * It can be reset via smackfs/direct |
| 67 | */ |
| 68 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; |
| 69 | |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 70 | /* |
| 71 | * Unless a process is running with this label even |
| 72 | * having CAP_MAC_OVERRIDE isn't enough to grant |
| 73 | * privilege to violate MAC policy. If no label is |
| 74 | * designated (the NULL case) capabilities apply to |
| 75 | * everyone. It is expected that the hat (^) label |
| 76 | * will be used if any label is used. |
| 77 | */ |
| 78 | char *smack_onlycap; |
| 79 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 80 | /* |
| 81 | * Certain IP addresses may be designated as single label hosts. |
| 82 | * Packets are sent there unlabeled, but only from tasks that |
| 83 | * can write to the specified label. |
| 84 | */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 85 | |
| 86 | LIST_HEAD(smk_netlbladdr_list); |
| 87 | LIST_HEAD(smack_rule_list); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 88 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 89 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 90 | |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 91 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
| 92 | |
| 93 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 94 | #define SEQ_READ_FINISHED 1 |
| 95 | |
| 96 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 97 | * Values for parsing cipso rules |
| 98 | * SMK_DIGITLEN: Length of a digit field in a rule. |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 99 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
| 100 | * SMK_CIPSOMAX: Maximum possible cipso rule length. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 101 | */ |
| 102 | #define SMK_DIGITLEN 4 |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 103 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
| 104 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) |
| 105 | |
| 106 | /* |
| 107 | * Values for parsing MAC rules |
| 108 | * SMK_ACCESS: Maximum possible combination of access permissions |
| 109 | * SMK_ACCESSLEN: Maximum length for a rule access field |
| 110 | * SMK_LOADLEN: Smack rule length |
| 111 | */ |
| 112 | #define SMK_ACCESS "rwxa" |
| 113 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) |
| 114 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) |
| 115 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 116 | /** |
| 117 | * smk_netlabel_audit_set - fill a netlbl_audit struct |
| 118 | * @nap: structure to fill |
| 119 | */ |
| 120 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) |
| 121 | { |
| 122 | nap->loginuid = audit_get_loginuid(current); |
| 123 | nap->sessionid = audit_get_sessionid(current); |
| 124 | nap->secid = smack_to_secid(current_security()); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * Values for parsing single label host rules |
| 129 | * "1.2.3.4 X" |
| 130 | * "192.168.138.129/32 abcdefghijklmnopqrstuvw" |
| 131 | */ |
| 132 | #define SMK_NETLBLADDRMIN 9 |
| 133 | #define SMK_NETLBLADDRMAX 42 |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * Seq_file read operations for /smack/load |
| 137 | */ |
| 138 | |
| 139 | static void *load_seq_start(struct seq_file *s, loff_t *pos) |
| 140 | { |
| 141 | if (*pos == SEQ_READ_FINISHED) |
| 142 | return NULL; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 143 | if (list_empty(&smack_rule_list)) |
| 144 | return NULL; |
| 145 | return smack_rule_list.next; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 149 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 150 | struct list_head *list = v; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 151 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 152 | if (list_is_last(list, &smack_rule_list)) { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 153 | *pos = SEQ_READ_FINISHED; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 154 | return NULL; |
| 155 | } |
| 156 | return list->next; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | static int load_seq_show(struct seq_file *s, void *v) |
| 160 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 161 | struct list_head *list = v; |
| 162 | struct smack_rule *srp = |
| 163 | list_entry(list, struct smack_rule, list); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 164 | |
| 165 | seq_printf(s, "%s %s", (char *)srp->smk_subject, |
| 166 | (char *)srp->smk_object); |
| 167 | |
| 168 | seq_putc(s, ' '); |
| 169 | |
| 170 | if (srp->smk_access & MAY_READ) |
| 171 | seq_putc(s, 'r'); |
| 172 | if (srp->smk_access & MAY_WRITE) |
| 173 | seq_putc(s, 'w'); |
| 174 | if (srp->smk_access & MAY_EXEC) |
| 175 | seq_putc(s, 'x'); |
| 176 | if (srp->smk_access & MAY_APPEND) |
| 177 | seq_putc(s, 'a'); |
| 178 | if (srp->smk_access == 0) |
| 179 | seq_putc(s, '-'); |
| 180 | |
| 181 | seq_putc(s, '\n'); |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | static void load_seq_stop(struct seq_file *s, void *v) |
| 187 | { |
| 188 | /* No-op */ |
| 189 | } |
| 190 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 191 | static const struct seq_operations load_seq_ops = { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 192 | .start = load_seq_start, |
| 193 | .next = load_seq_next, |
| 194 | .show = load_seq_show, |
| 195 | .stop = load_seq_stop, |
| 196 | }; |
| 197 | |
| 198 | /** |
| 199 | * smk_open_load - open() for /smack/load |
| 200 | * @inode: inode structure representing file |
| 201 | * @file: "load" file pointer |
| 202 | * |
| 203 | * For reading, use load_seq_* seq_file reading operations. |
| 204 | */ |
| 205 | static int smk_open_load(struct inode *inode, struct file *file) |
| 206 | { |
Ahmed S. Darwish | cb622bb | 2008-03-24 12:29:49 -0700 | [diff] [blame] | 207 | return seq_open(file, &load_seq_ops); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | /** |
| 211 | * smk_set_access - add a rule to the rule list |
| 212 | * @srp: the new rule to add |
| 213 | * |
| 214 | * Looks through the current subject/object/access list for |
| 215 | * the subject/object pair and replaces the access that was |
| 216 | * there. If the pair isn't found add it with the specified |
| 217 | * access. |
Sergio Luis | 81ea714 | 2008-12-22 01:16:15 -0300 | [diff] [blame] | 218 | * |
| 219 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails |
| 220 | * during the allocation of the new pair to add. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 221 | */ |
Sergio Luis | 81ea714 | 2008-12-22 01:16:15 -0300 | [diff] [blame] | 222 | static int smk_set_access(struct smack_rule *srp) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 223 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 224 | struct smack_rule *sp; |
Sergio Luis | 81ea714 | 2008-12-22 01:16:15 -0300 | [diff] [blame] | 225 | int ret = 0; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 226 | int found; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 227 | mutex_lock(&smack_list_lock); |
| 228 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 229 | found = 0; |
| 230 | list_for_each_entry_rcu(sp, &smack_rule_list, list) { |
| 231 | if (sp->smk_subject == srp->smk_subject && |
| 232 | sp->smk_object == srp->smk_object) { |
| 233 | found = 1; |
| 234 | sp->smk_access = srp->smk_access; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 235 | break; |
| 236 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 237 | } |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 238 | if (found == 0) |
| 239 | list_add_rcu(&srp->list, &smack_rule_list); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 240 | |
| 241 | mutex_unlock(&smack_list_lock); |
| 242 | |
Sergio Luis | 81ea714 | 2008-12-22 01:16:15 -0300 | [diff] [blame] | 243 | return ret; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | /** |
| 247 | * smk_write_load - write() for /smack/load |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 248 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 249 | * @buf: where to get the data from |
| 250 | * @count: bytes sent |
| 251 | * @ppos: where to start - must be 0 |
| 252 | * |
| 253 | * Get one smack access rule from above. |
| 254 | * The format is exactly: |
| 255 | * char subject[SMK_LABELLEN] |
| 256 | * char object[SMK_LABELLEN] |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 257 | * char access[SMK_ACCESSLEN] |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 258 | * |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 259 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 260 | */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 261 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
| 262 | size_t count, loff_t *ppos) |
| 263 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 264 | struct smack_rule *rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 265 | char *data; |
| 266 | int rc = -EINVAL; |
| 267 | |
| 268 | /* |
| 269 | * Must have privilege. |
| 270 | * No partial writes. |
| 271 | * Enough data must be present. |
| 272 | */ |
| 273 | if (!capable(CAP_MAC_ADMIN)) |
| 274 | return -EPERM; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 275 | |
| 276 | if (*ppos != 0 || count != SMK_LOADLEN) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 277 | return -EINVAL; |
| 278 | |
| 279 | data = kzalloc(count, GFP_KERNEL); |
| 280 | if (data == NULL) |
| 281 | return -ENOMEM; |
| 282 | |
| 283 | if (copy_from_user(data, buf, count) != 0) { |
| 284 | rc = -EFAULT; |
| 285 | goto out; |
| 286 | } |
| 287 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 288 | rule = kzalloc(sizeof(*rule), GFP_KERNEL); |
| 289 | if (rule == NULL) { |
| 290 | rc = -ENOMEM; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 291 | goto out; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 292 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 293 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 294 | rule->smk_subject = smk_import(data, 0); |
| 295 | if (rule->smk_subject == NULL) |
| 296 | goto out_free_rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 297 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 298 | rule->smk_object = smk_import(data + SMK_LABELLEN, 0); |
| 299 | if (rule->smk_object == NULL) |
| 300 | goto out_free_rule; |
| 301 | |
| 302 | rule->smk_access = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 303 | |
| 304 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { |
| 305 | case '-': |
| 306 | break; |
| 307 | case 'r': |
| 308 | case 'R': |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 309 | rule->smk_access |= MAY_READ; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 310 | break; |
| 311 | default: |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 312 | goto out_free_rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { |
| 316 | case '-': |
| 317 | break; |
| 318 | case 'w': |
| 319 | case 'W': |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 320 | rule->smk_access |= MAY_WRITE; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 321 | break; |
| 322 | default: |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 323 | goto out_free_rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { |
| 327 | case '-': |
| 328 | break; |
| 329 | case 'x': |
| 330 | case 'X': |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 331 | rule->smk_access |= MAY_EXEC; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 332 | break; |
| 333 | default: |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 334 | goto out_free_rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { |
| 338 | case '-': |
| 339 | break; |
| 340 | case 'a': |
| 341 | case 'A': |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 342 | rule->smk_access |= MAY_APPEND; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 343 | break; |
| 344 | default: |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 345 | goto out_free_rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 346 | } |
| 347 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 348 | rc = smk_set_access(rule); |
Sergio Luis | 81ea714 | 2008-12-22 01:16:15 -0300 | [diff] [blame] | 349 | |
| 350 | if (!rc) |
| 351 | rc = count; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 352 | goto out; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 353 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 354 | out_free_rule: |
| 355 | kfree(rule); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 356 | out: |
| 357 | kfree(data); |
| 358 | return rc; |
| 359 | } |
| 360 | |
| 361 | static const struct file_operations smk_load_ops = { |
| 362 | .open = smk_open_load, |
| 363 | .read = seq_read, |
| 364 | .llseek = seq_lseek, |
| 365 | .write = smk_write_load, |
Ahmed S. Darwish | cb622bb | 2008-03-24 12:29:49 -0700 | [diff] [blame] | 366 | .release = seq_release, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 367 | }; |
| 368 | |
| 369 | /** |
| 370 | * smk_cipso_doi - initialize the CIPSO domain |
| 371 | */ |
Casey Schaufler | 30aa4fa | 2008-04-28 02:13:43 -0700 | [diff] [blame] | 372 | static void smk_cipso_doi(void) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 373 | { |
| 374 | int rc; |
| 375 | struct cipso_v4_doi *doip; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 376 | struct netlbl_audit nai; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 377 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 378 | smk_netlabel_audit_set(&nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 379 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 380 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 381 | if (rc != 0) |
| 382 | printk(KERN_WARNING "%s:%d remove rc = %d\n", |
| 383 | __func__, __LINE__, rc); |
| 384 | |
| 385 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); |
| 386 | if (doip == NULL) |
| 387 | panic("smack: Failed to initialize cipso DOI.\n"); |
| 388 | doip->map.std = NULL; |
| 389 | doip->doi = smk_cipso_doi_value; |
| 390 | doip->type = CIPSO_V4_MAP_PASS; |
| 391 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; |
| 392 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) |
| 393 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; |
| 394 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 395 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 396 | if (rc != 0) { |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 397 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 398 | __func__, __LINE__, rc); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 399 | kfree(doip); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 400 | return; |
| 401 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 402 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 403 | if (rc != 0) { |
| 404 | printk(KERN_WARNING "%s:%d map add rc = %d\n", |
| 405 | __func__, __LINE__, rc); |
| 406 | kfree(doip); |
| 407 | return; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 408 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 409 | } |
| 410 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 411 | /** |
| 412 | * smk_unlbl_ambient - initialize the unlabeled domain |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 413 | * @oldambient: previous domain string |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 414 | */ |
Casey Schaufler | 30aa4fa | 2008-04-28 02:13:43 -0700 | [diff] [blame] | 415 | static void smk_unlbl_ambient(char *oldambient) |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 416 | { |
| 417 | int rc; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 418 | struct netlbl_audit nai; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 419 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 420 | smk_netlabel_audit_set(&nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 421 | |
| 422 | if (oldambient != NULL) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 423 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 424 | if (rc != 0) |
| 425 | printk(KERN_WARNING "%s:%d remove rc = %d\n", |
| 426 | __func__, __LINE__, rc); |
| 427 | } |
| 428 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 429 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET, |
| 430 | NULL, NULL, &nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 431 | if (rc != 0) |
| 432 | printk(KERN_WARNING "%s:%d add rc = %d\n", |
| 433 | __func__, __LINE__, rc); |
| 434 | } |
| 435 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 436 | /* |
| 437 | * Seq_file read operations for /smack/cipso |
| 438 | */ |
| 439 | |
| 440 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) |
| 441 | { |
| 442 | if (*pos == SEQ_READ_FINISHED) |
| 443 | return NULL; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 444 | if (list_empty(&smack_known_list)) |
| 445 | return NULL; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 446 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 447 | return smack_known_list.next; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 451 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 452 | struct list_head *list = v; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 453 | |
| 454 | /* |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 455 | * labels with no associated cipso value wont be printed |
| 456 | * in cipso_seq_show |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 457 | */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 458 | if (list_is_last(list, &smack_known_list)) { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 459 | *pos = SEQ_READ_FINISHED; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 460 | return NULL; |
| 461 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 462 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 463 | return list->next; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Print cipso labels in format: |
| 468 | * label level[/cat[,cat]] |
| 469 | */ |
| 470 | static int cipso_seq_show(struct seq_file *s, void *v) |
| 471 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 472 | struct list_head *list = v; |
| 473 | struct smack_known *skp = |
| 474 | list_entry(list, struct smack_known, list); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 475 | struct smack_cipso *scp = skp->smk_cipso; |
| 476 | char *cbp; |
| 477 | char sep = '/'; |
| 478 | int cat = 1; |
| 479 | int i; |
| 480 | unsigned char m; |
| 481 | |
| 482 | if (scp == NULL) |
| 483 | return 0; |
| 484 | |
| 485 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); |
| 486 | |
| 487 | cbp = scp->smk_catset; |
| 488 | for (i = 0; i < SMK_LABELLEN; i++) |
| 489 | for (m = 0x80; m != 0; m >>= 1) { |
| 490 | if (m & cbp[i]) { |
| 491 | seq_printf(s, "%c%d", sep, cat); |
| 492 | sep = ','; |
| 493 | } |
| 494 | cat++; |
| 495 | } |
| 496 | |
| 497 | seq_putc(s, '\n'); |
| 498 | |
| 499 | return 0; |
| 500 | } |
| 501 | |
| 502 | static void cipso_seq_stop(struct seq_file *s, void *v) |
| 503 | { |
| 504 | /* No-op */ |
| 505 | } |
| 506 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 507 | static const struct seq_operations cipso_seq_ops = { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 508 | .start = cipso_seq_start, |
| 509 | .stop = cipso_seq_stop, |
| 510 | .next = cipso_seq_next, |
| 511 | .show = cipso_seq_show, |
| 512 | }; |
| 513 | |
| 514 | /** |
| 515 | * smk_open_cipso - open() for /smack/cipso |
| 516 | * @inode: inode structure representing file |
| 517 | * @file: "cipso" file pointer |
| 518 | * |
| 519 | * Connect our cipso_seq_* operations with /smack/cipso |
| 520 | * file_operations |
| 521 | */ |
| 522 | static int smk_open_cipso(struct inode *inode, struct file *file) |
| 523 | { |
| 524 | return seq_open(file, &cipso_seq_ops); |
| 525 | } |
| 526 | |
| 527 | /** |
| 528 | * smk_write_cipso - write() for /smack/cipso |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 529 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 530 | * @buf: where to get the data from |
| 531 | * @count: bytes sent |
| 532 | * @ppos: where to start |
| 533 | * |
| 534 | * Accepts only one cipso rule per write call. |
| 535 | * Returns number of bytes written or error code, as appropriate |
| 536 | */ |
| 537 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, |
| 538 | size_t count, loff_t *ppos) |
| 539 | { |
| 540 | struct smack_known *skp; |
| 541 | struct smack_cipso *scp = NULL; |
| 542 | char mapcatset[SMK_LABELLEN]; |
| 543 | int maplevel; |
| 544 | int cat; |
| 545 | int catlen; |
| 546 | ssize_t rc = -EINVAL; |
| 547 | char *data = NULL; |
| 548 | char *rule; |
| 549 | int ret; |
| 550 | int i; |
| 551 | |
| 552 | /* |
| 553 | * Must have privilege. |
| 554 | * No partial writes. |
| 555 | * Enough data must be present. |
| 556 | */ |
| 557 | if (!capable(CAP_MAC_ADMIN)) |
| 558 | return -EPERM; |
| 559 | if (*ppos != 0) |
| 560 | return -EINVAL; |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 561 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 562 | return -EINVAL; |
| 563 | |
| 564 | data = kzalloc(count + 1, GFP_KERNEL); |
| 565 | if (data == NULL) |
| 566 | return -ENOMEM; |
| 567 | |
| 568 | if (copy_from_user(data, buf, count) != 0) { |
| 569 | rc = -EFAULT; |
| 570 | goto unlockedout; |
| 571 | } |
| 572 | |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 573 | /* labels cannot begin with a '-' */ |
| 574 | if (data[0] == '-') { |
| 575 | rc = -EINVAL; |
| 576 | goto unlockedout; |
| 577 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 578 | data[count] = '\0'; |
| 579 | rule = data; |
| 580 | /* |
| 581 | * Only allow one writer at a time. Writes should be |
| 582 | * quite rare and small in any case. |
| 583 | */ |
| 584 | mutex_lock(&smack_cipso_lock); |
| 585 | |
| 586 | skp = smk_import_entry(rule, 0); |
| 587 | if (skp == NULL) |
| 588 | goto out; |
| 589 | |
Fernando Carrijo | c19a28e | 2009-01-07 18:09:08 -0800 | [diff] [blame] | 590 | rule += SMK_LABELLEN; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 591 | ret = sscanf(rule, "%d", &maplevel); |
| 592 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) |
| 593 | goto out; |
| 594 | |
| 595 | rule += SMK_DIGITLEN; |
| 596 | ret = sscanf(rule, "%d", &catlen); |
| 597 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) |
| 598 | goto out; |
| 599 | |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 600 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 601 | goto out; |
| 602 | |
| 603 | memset(mapcatset, 0, sizeof(mapcatset)); |
| 604 | |
| 605 | for (i = 0; i < catlen; i++) { |
| 606 | rule += SMK_DIGITLEN; |
| 607 | ret = sscanf(rule, "%d", &cat); |
| 608 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) |
| 609 | goto out; |
| 610 | |
| 611 | smack_catset_bit(cat, mapcatset); |
| 612 | } |
| 613 | |
| 614 | if (skp->smk_cipso == NULL) { |
| 615 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); |
| 616 | if (scp == NULL) { |
| 617 | rc = -ENOMEM; |
| 618 | goto out; |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | spin_lock_bh(&skp->smk_cipsolock); |
| 623 | |
| 624 | if (scp == NULL) |
| 625 | scp = skp->smk_cipso; |
| 626 | else |
| 627 | skp->smk_cipso = scp; |
| 628 | |
| 629 | scp->smk_level = maplevel; |
| 630 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); |
| 631 | |
| 632 | spin_unlock_bh(&skp->smk_cipsolock); |
| 633 | |
| 634 | rc = count; |
| 635 | out: |
| 636 | mutex_unlock(&smack_cipso_lock); |
| 637 | unlockedout: |
| 638 | kfree(data); |
| 639 | return rc; |
| 640 | } |
| 641 | |
| 642 | static const struct file_operations smk_cipso_ops = { |
| 643 | .open = smk_open_cipso, |
| 644 | .read = seq_read, |
| 645 | .llseek = seq_lseek, |
| 646 | .write = smk_write_cipso, |
| 647 | .release = seq_release, |
| 648 | }; |
| 649 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 650 | /* |
| 651 | * Seq_file read operations for /smack/netlabel |
| 652 | */ |
| 653 | |
| 654 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) |
| 655 | { |
| 656 | if (*pos == SEQ_READ_FINISHED) |
| 657 | return NULL; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 658 | if (list_empty(&smk_netlbladdr_list)) |
| 659 | return NULL; |
| 660 | return smk_netlbladdr_list.next; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 661 | } |
| 662 | |
| 663 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 664 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 665 | struct list_head *list = v; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 666 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 667 | if (list_is_last(list, &smk_netlbladdr_list)) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 668 | *pos = SEQ_READ_FINISHED; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 669 | return NULL; |
| 670 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 671 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 672 | return list->next; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 673 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 674 | #define BEBITS (sizeof(__be32) * 8) |
| 675 | |
| 676 | /* |
| 677 | * Print host/label pairs |
| 678 | */ |
| 679 | static int netlbladdr_seq_show(struct seq_file *s, void *v) |
| 680 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 681 | struct list_head *list = v; |
| 682 | struct smk_netlbladdr *skp = |
| 683 | list_entry(list, struct smk_netlbladdr, list); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 684 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 685 | int maskn; |
| 686 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 687 | |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 688 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 689 | |
| 690 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", |
| 691 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); |
| 692 | |
| 693 | return 0; |
| 694 | } |
| 695 | |
| 696 | static void netlbladdr_seq_stop(struct seq_file *s, void *v) |
| 697 | { |
| 698 | /* No-op */ |
| 699 | } |
| 700 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 701 | static const struct seq_operations netlbladdr_seq_ops = { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 702 | .start = netlbladdr_seq_start, |
| 703 | .stop = netlbladdr_seq_stop, |
| 704 | .next = netlbladdr_seq_next, |
| 705 | .show = netlbladdr_seq_show, |
| 706 | }; |
| 707 | |
| 708 | /** |
| 709 | * smk_open_netlbladdr - open() for /smack/netlabel |
| 710 | * @inode: inode structure representing file |
| 711 | * @file: "netlabel" file pointer |
| 712 | * |
| 713 | * Connect our netlbladdr_seq_* operations with /smack/netlabel |
| 714 | * file_operations |
| 715 | */ |
| 716 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) |
| 717 | { |
| 718 | return seq_open(file, &netlbladdr_seq_ops); |
| 719 | } |
| 720 | |
| 721 | /** |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 722 | * smk_netlbladdr_insert |
| 723 | * @new : netlabel to insert |
| 724 | * |
| 725 | * This helper insert netlabel in the smack_netlbladdrs list |
| 726 | * sorted by netmask length (longest to smallest) |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 727 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
| 728 | * |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 729 | */ |
| 730 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) |
| 731 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 732 | struct smk_netlbladdr *m, *m_next; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 733 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 734 | if (list_empty(&smk_netlbladdr_list)) { |
| 735 | list_add_rcu(&new->list, &smk_netlbladdr_list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 736 | return; |
| 737 | } |
| 738 | |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 739 | m = list_entry_rcu(smk_netlbladdr_list.next, |
| 740 | struct smk_netlbladdr, list); |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 741 | |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 742 | /* the comparison '>' is a bit hacky, but works */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 743 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
| 744 | list_add_rcu(&new->list, &smk_netlbladdr_list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 745 | return; |
| 746 | } |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 747 | |
| 748 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { |
| 749 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { |
| 750 | list_add_rcu(&new->list, &m->list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 751 | return; |
| 752 | } |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 753 | m_next = list_entry_rcu(m->list.next, |
| 754 | struct smk_netlbladdr, list); |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 755 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
| 756 | list_add_rcu(&new->list, &m->list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 757 | return; |
| 758 | } |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | |
| 763 | /** |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 764 | * smk_write_netlbladdr - write() for /smack/netlabel |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 765 | * @file: file pointer, not actually used |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 766 | * @buf: where to get the data from |
| 767 | * @count: bytes sent |
| 768 | * @ppos: where to start |
| 769 | * |
| 770 | * Accepts only one netlbladdr per write call. |
| 771 | * Returns number of bytes written or error code, as appropriate |
| 772 | */ |
| 773 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, |
| 774 | size_t count, loff_t *ppos) |
| 775 | { |
| 776 | struct smk_netlbladdr *skp; |
| 777 | struct sockaddr_in newname; |
| 778 | char smack[SMK_LABELLEN]; |
| 779 | char *sp; |
Roel Kluin | 6470c07 | 2009-05-21 18:42:54 +0200 | [diff] [blame] | 780 | char data[SMK_NETLBLADDRMAX + 1]; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 781 | char *host = (char *)&newname.sin_addr.s_addr; |
| 782 | int rc; |
| 783 | struct netlbl_audit audit_info; |
| 784 | struct in_addr mask; |
| 785 | unsigned int m; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 786 | int found; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 787 | u32 mask_bits = (1<<31); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 788 | __be32 nsa; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 789 | u32 temp_mask; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 790 | |
| 791 | /* |
| 792 | * Must have privilege. |
| 793 | * No partial writes. |
| 794 | * Enough data must be present. |
| 795 | * "<addr/mask, as a.b.c.d/e><space><label>" |
| 796 | * "<addr, as a.b.c.d><space><label>" |
| 797 | */ |
| 798 | if (!capable(CAP_MAC_ADMIN)) |
| 799 | return -EPERM; |
| 800 | if (*ppos != 0) |
| 801 | return -EINVAL; |
| 802 | if (count < SMK_NETLBLADDRMIN || count > SMK_NETLBLADDRMAX) |
| 803 | return -EINVAL; |
| 804 | if (copy_from_user(data, buf, count) != 0) |
| 805 | return -EFAULT; |
| 806 | |
| 807 | data[count] = '\0'; |
| 808 | |
| 809 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", |
| 810 | &host[0], &host[1], &host[2], &host[3], &m, smack); |
| 811 | if (rc != 6) { |
| 812 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", |
| 813 | &host[0], &host[1], &host[2], &host[3], smack); |
| 814 | if (rc != 5) |
| 815 | return -EINVAL; |
| 816 | m = BEBITS; |
| 817 | } |
| 818 | if (m > BEBITS) |
| 819 | return -EINVAL; |
| 820 | |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 821 | /* if smack begins with '-', its an option, don't import it */ |
| 822 | if (smack[0] != '-') { |
| 823 | sp = smk_import(smack, 0); |
| 824 | if (sp == NULL) |
| 825 | return -EINVAL; |
| 826 | } else { |
| 827 | /* check known options */ |
| 828 | if (strcmp(smack, smack_cipso_option) == 0) |
| 829 | sp = (char *)smack_cipso_option; |
| 830 | else |
| 831 | return -EINVAL; |
| 832 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 833 | |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 834 | for (temp_mask = 0; m > 0; m--) { |
| 835 | temp_mask |= mask_bits; |
| 836 | mask_bits >>= 1; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 837 | } |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 838 | mask.s_addr = cpu_to_be32(temp_mask); |
| 839 | |
| 840 | newname.sin_addr.s_addr &= mask.s_addr; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 841 | /* |
| 842 | * Only allow one writer at a time. Writes should be |
| 843 | * quite rare and small in any case. |
| 844 | */ |
| 845 | mutex_lock(&smk_netlbladdr_lock); |
| 846 | |
| 847 | nsa = newname.sin_addr.s_addr; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 848 | /* try to find if the prefix is already in the list */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 849 | found = 0; |
| 850 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 851 | if (skp->smk_host.sin_addr.s_addr == nsa && |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 852 | skp->smk_mask.s_addr == mask.s_addr) { |
| 853 | found = 1; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 854 | break; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 855 | } |
| 856 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 857 | smk_netlabel_audit_set(&audit_info); |
| 858 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 859 | if (found == 0) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 860 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
| 861 | if (skp == NULL) |
| 862 | rc = -ENOMEM; |
| 863 | else { |
| 864 | rc = 0; |
| 865 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; |
| 866 | skp->smk_mask.s_addr = mask.s_addr; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 867 | skp->smk_label = sp; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 868 | smk_netlbladdr_insert(skp); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 869 | } |
| 870 | } else { |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 871 | /* we delete the unlabeled entry, only if the previous label |
| 872 | * wasnt the special CIPSO option */ |
| 873 | if (skp->smk_label != smack_cipso_option) |
| 874 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
| 875 | &skp->smk_host.sin_addr, &skp->smk_mask, |
| 876 | PF_INET, &audit_info); |
| 877 | else |
| 878 | rc = 0; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 879 | skp->smk_label = sp; |
| 880 | } |
| 881 | |
| 882 | /* |
| 883 | * Now tell netlabel about the single label nature of |
| 884 | * this host so that incoming packets get labeled. |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 885 | * but only if we didn't get the special CIPSO option |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 886 | */ |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 887 | if (rc == 0 && sp != smack_cipso_option) |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 888 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
| 889 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, |
| 890 | smack_to_secid(skp->smk_label), &audit_info); |
| 891 | |
| 892 | if (rc == 0) |
| 893 | rc = count; |
| 894 | |
| 895 | mutex_unlock(&smk_netlbladdr_lock); |
| 896 | |
| 897 | return rc; |
| 898 | } |
| 899 | |
| 900 | static const struct file_operations smk_netlbladdr_ops = { |
| 901 | .open = smk_open_netlbladdr, |
| 902 | .read = seq_read, |
| 903 | .llseek = seq_lseek, |
| 904 | .write = smk_write_netlbladdr, |
| 905 | .release = seq_release, |
| 906 | }; |
| 907 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 908 | /** |
| 909 | * smk_read_doi - read() for /smack/doi |
| 910 | * @filp: file pointer, not actually used |
| 911 | * @buf: where to put the result |
| 912 | * @count: maximum to send along |
| 913 | * @ppos: where to start |
| 914 | * |
| 915 | * Returns number of bytes read or error code, as appropriate |
| 916 | */ |
| 917 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, |
| 918 | size_t count, loff_t *ppos) |
| 919 | { |
| 920 | char temp[80]; |
| 921 | ssize_t rc; |
| 922 | |
| 923 | if (*ppos != 0) |
| 924 | return 0; |
| 925 | |
| 926 | sprintf(temp, "%d", smk_cipso_doi_value); |
| 927 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 928 | |
| 929 | return rc; |
| 930 | } |
| 931 | |
| 932 | /** |
| 933 | * smk_write_doi - write() for /smack/doi |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 934 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 935 | * @buf: where to get the data from |
| 936 | * @count: bytes sent |
| 937 | * @ppos: where to start |
| 938 | * |
| 939 | * Returns number of bytes written or error code, as appropriate |
| 940 | */ |
| 941 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, |
| 942 | size_t count, loff_t *ppos) |
| 943 | { |
| 944 | char temp[80]; |
| 945 | int i; |
| 946 | |
| 947 | if (!capable(CAP_MAC_ADMIN)) |
| 948 | return -EPERM; |
| 949 | |
| 950 | if (count >= sizeof(temp) || count == 0) |
| 951 | return -EINVAL; |
| 952 | |
| 953 | if (copy_from_user(temp, buf, count) != 0) |
| 954 | return -EFAULT; |
| 955 | |
| 956 | temp[count] = '\0'; |
| 957 | |
| 958 | if (sscanf(temp, "%d", &i) != 1) |
| 959 | return -EINVAL; |
| 960 | |
| 961 | smk_cipso_doi_value = i; |
| 962 | |
| 963 | smk_cipso_doi(); |
| 964 | |
| 965 | return count; |
| 966 | } |
| 967 | |
| 968 | static const struct file_operations smk_doi_ops = { |
| 969 | .read = smk_read_doi, |
| 970 | .write = smk_write_doi, |
| 971 | }; |
| 972 | |
| 973 | /** |
| 974 | * smk_read_direct - read() for /smack/direct |
| 975 | * @filp: file pointer, not actually used |
| 976 | * @buf: where to put the result |
| 977 | * @count: maximum to send along |
| 978 | * @ppos: where to start |
| 979 | * |
| 980 | * Returns number of bytes read or error code, as appropriate |
| 981 | */ |
| 982 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, |
| 983 | size_t count, loff_t *ppos) |
| 984 | { |
| 985 | char temp[80]; |
| 986 | ssize_t rc; |
| 987 | |
| 988 | if (*ppos != 0) |
| 989 | return 0; |
| 990 | |
| 991 | sprintf(temp, "%d", smack_cipso_direct); |
| 992 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 993 | |
| 994 | return rc; |
| 995 | } |
| 996 | |
| 997 | /** |
| 998 | * smk_write_direct - write() for /smack/direct |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 999 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1000 | * @buf: where to get the data from |
| 1001 | * @count: bytes sent |
| 1002 | * @ppos: where to start |
| 1003 | * |
| 1004 | * Returns number of bytes written or error code, as appropriate |
| 1005 | */ |
| 1006 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, |
| 1007 | size_t count, loff_t *ppos) |
| 1008 | { |
| 1009 | char temp[80]; |
| 1010 | int i; |
| 1011 | |
| 1012 | if (!capable(CAP_MAC_ADMIN)) |
| 1013 | return -EPERM; |
| 1014 | |
| 1015 | if (count >= sizeof(temp) || count == 0) |
| 1016 | return -EINVAL; |
| 1017 | |
| 1018 | if (copy_from_user(temp, buf, count) != 0) |
| 1019 | return -EFAULT; |
| 1020 | |
| 1021 | temp[count] = '\0'; |
| 1022 | |
| 1023 | if (sscanf(temp, "%d", &i) != 1) |
| 1024 | return -EINVAL; |
| 1025 | |
| 1026 | smack_cipso_direct = i; |
| 1027 | |
| 1028 | return count; |
| 1029 | } |
| 1030 | |
| 1031 | static const struct file_operations smk_direct_ops = { |
| 1032 | .read = smk_read_direct, |
| 1033 | .write = smk_write_direct, |
| 1034 | }; |
| 1035 | |
| 1036 | /** |
| 1037 | * smk_read_ambient - read() for /smack/ambient |
| 1038 | * @filp: file pointer, not actually used |
| 1039 | * @buf: where to put the result |
| 1040 | * @cn: maximum to send along |
| 1041 | * @ppos: where to start |
| 1042 | * |
| 1043 | * Returns number of bytes read or error code, as appropriate |
| 1044 | */ |
| 1045 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, |
| 1046 | size_t cn, loff_t *ppos) |
| 1047 | { |
| 1048 | ssize_t rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1049 | int asize; |
| 1050 | |
| 1051 | if (*ppos != 0) |
| 1052 | return 0; |
| 1053 | /* |
| 1054 | * Being careful to avoid a problem in the case where |
| 1055 | * smack_net_ambient gets changed in midstream. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1056 | */ |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1057 | mutex_lock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1058 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1059 | asize = strlen(smack_net_ambient) + 1; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1060 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1061 | if (cn >= asize) |
| 1062 | rc = simple_read_from_buffer(buf, cn, ppos, |
| 1063 | smack_net_ambient, asize); |
| 1064 | else |
| 1065 | rc = -EINVAL; |
| 1066 | |
| 1067 | mutex_unlock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1068 | |
| 1069 | return rc; |
| 1070 | } |
| 1071 | |
| 1072 | /** |
| 1073 | * smk_write_ambient - write() for /smack/ambient |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1074 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1075 | * @buf: where to get the data from |
| 1076 | * @count: bytes sent |
| 1077 | * @ppos: where to start |
| 1078 | * |
| 1079 | * Returns number of bytes written or error code, as appropriate |
| 1080 | */ |
| 1081 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, |
| 1082 | size_t count, loff_t *ppos) |
| 1083 | { |
| 1084 | char in[SMK_LABELLEN]; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1085 | char *oldambient; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1086 | char *smack; |
| 1087 | |
| 1088 | if (!capable(CAP_MAC_ADMIN)) |
| 1089 | return -EPERM; |
| 1090 | |
| 1091 | if (count >= SMK_LABELLEN) |
| 1092 | return -EINVAL; |
| 1093 | |
| 1094 | if (copy_from_user(in, buf, count) != 0) |
| 1095 | return -EFAULT; |
| 1096 | |
| 1097 | smack = smk_import(in, count); |
| 1098 | if (smack == NULL) |
| 1099 | return -EINVAL; |
| 1100 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1101 | mutex_lock(&smack_ambient_lock); |
| 1102 | |
| 1103 | oldambient = smack_net_ambient; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1104 | smack_net_ambient = smack; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1105 | smk_unlbl_ambient(oldambient); |
| 1106 | |
| 1107 | mutex_unlock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1108 | |
| 1109 | return count; |
| 1110 | } |
| 1111 | |
| 1112 | static const struct file_operations smk_ambient_ops = { |
| 1113 | .read = smk_read_ambient, |
| 1114 | .write = smk_write_ambient, |
| 1115 | }; |
| 1116 | |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1117 | /** |
| 1118 | * smk_read_onlycap - read() for /smack/onlycap |
| 1119 | * @filp: file pointer, not actually used |
| 1120 | * @buf: where to put the result |
| 1121 | * @cn: maximum to send along |
| 1122 | * @ppos: where to start |
| 1123 | * |
| 1124 | * Returns number of bytes read or error code, as appropriate |
| 1125 | */ |
| 1126 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, |
| 1127 | size_t cn, loff_t *ppos) |
| 1128 | { |
| 1129 | char *smack = ""; |
| 1130 | ssize_t rc = -EINVAL; |
| 1131 | int asize; |
| 1132 | |
| 1133 | if (*ppos != 0) |
| 1134 | return 0; |
| 1135 | |
| 1136 | if (smack_onlycap != NULL) |
| 1137 | smack = smack_onlycap; |
| 1138 | |
| 1139 | asize = strlen(smack) + 1; |
| 1140 | |
| 1141 | if (cn >= asize) |
| 1142 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); |
| 1143 | |
| 1144 | return rc; |
| 1145 | } |
| 1146 | |
| 1147 | /** |
| 1148 | * smk_write_onlycap - write() for /smack/onlycap |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1149 | * @file: file pointer, not actually used |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1150 | * @buf: where to get the data from |
| 1151 | * @count: bytes sent |
| 1152 | * @ppos: where to start |
| 1153 | * |
| 1154 | * Returns number of bytes written or error code, as appropriate |
| 1155 | */ |
| 1156 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, |
| 1157 | size_t count, loff_t *ppos) |
| 1158 | { |
| 1159 | char in[SMK_LABELLEN]; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1160 | char *sp = current->cred->security; |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1161 | |
| 1162 | if (!capable(CAP_MAC_ADMIN)) |
| 1163 | return -EPERM; |
| 1164 | |
| 1165 | /* |
| 1166 | * This can be done using smk_access() but is done |
| 1167 | * explicitly for clarity. The smk_access() implementation |
| 1168 | * would use smk_access(smack_onlycap, MAY_WRITE) |
| 1169 | */ |
| 1170 | if (smack_onlycap != NULL && smack_onlycap != sp) |
| 1171 | return -EPERM; |
| 1172 | |
| 1173 | if (count >= SMK_LABELLEN) |
| 1174 | return -EINVAL; |
| 1175 | |
| 1176 | if (copy_from_user(in, buf, count) != 0) |
| 1177 | return -EFAULT; |
| 1178 | |
| 1179 | /* |
| 1180 | * Should the null string be passed in unset the onlycap value. |
| 1181 | * This seems like something to be careful with as usually |
| 1182 | * smk_import only expects to return NULL for errors. It |
| 1183 | * is usually the case that a nullstring or "\n" would be |
| 1184 | * bad to pass to smk_import but in fact this is useful here. |
| 1185 | */ |
| 1186 | smack_onlycap = smk_import(in, count); |
| 1187 | |
| 1188 | return count; |
| 1189 | } |
| 1190 | |
| 1191 | static const struct file_operations smk_onlycap_ops = { |
| 1192 | .read = smk_read_onlycap, |
| 1193 | .write = smk_write_onlycap, |
| 1194 | }; |
| 1195 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1196 | /** |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1197 | * smk_read_logging - read() for /smack/logging |
| 1198 | * @filp: file pointer, not actually used |
| 1199 | * @buf: where to put the result |
| 1200 | * @cn: maximum to send along |
| 1201 | * @ppos: where to start |
| 1202 | * |
| 1203 | * Returns number of bytes read or error code, as appropriate |
| 1204 | */ |
| 1205 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, |
| 1206 | size_t count, loff_t *ppos) |
| 1207 | { |
| 1208 | char temp[32]; |
| 1209 | ssize_t rc; |
| 1210 | |
| 1211 | if (*ppos != 0) |
| 1212 | return 0; |
| 1213 | |
| 1214 | sprintf(temp, "%d\n", log_policy); |
| 1215 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 1216 | return rc; |
| 1217 | } |
| 1218 | |
| 1219 | /** |
| 1220 | * smk_write_logging - write() for /smack/logging |
| 1221 | * @file: file pointer, not actually used |
| 1222 | * @buf: where to get the data from |
| 1223 | * @count: bytes sent |
| 1224 | * @ppos: where to start |
| 1225 | * |
| 1226 | * Returns number of bytes written or error code, as appropriate |
| 1227 | */ |
| 1228 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, |
| 1229 | size_t count, loff_t *ppos) |
| 1230 | { |
| 1231 | char temp[32]; |
| 1232 | int i; |
| 1233 | |
| 1234 | if (!capable(CAP_MAC_ADMIN)) |
| 1235 | return -EPERM; |
| 1236 | |
| 1237 | if (count >= sizeof(temp) || count == 0) |
| 1238 | return -EINVAL; |
| 1239 | |
| 1240 | if (copy_from_user(temp, buf, count) != 0) |
| 1241 | return -EFAULT; |
| 1242 | |
| 1243 | temp[count] = '\0'; |
| 1244 | |
| 1245 | if (sscanf(temp, "%d", &i) != 1) |
| 1246 | return -EINVAL; |
| 1247 | if (i < 0 || i > 3) |
| 1248 | return -EINVAL; |
| 1249 | log_policy = i; |
| 1250 | return count; |
| 1251 | } |
| 1252 | |
| 1253 | |
| 1254 | |
| 1255 | static const struct file_operations smk_logging_ops = { |
| 1256 | .read = smk_read_logging, |
| 1257 | .write = smk_write_logging, |
| 1258 | }; |
| 1259 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1260 | * smk_fill_super - fill the /smackfs superblock |
| 1261 | * @sb: the empty superblock |
| 1262 | * @data: unused |
| 1263 | * @silent: unused |
| 1264 | * |
| 1265 | * Fill in the well known entries for /smack |
| 1266 | * |
| 1267 | * Returns 0 on success, an error code on failure |
| 1268 | */ |
| 1269 | static int smk_fill_super(struct super_block *sb, void *data, int silent) |
| 1270 | { |
| 1271 | int rc; |
| 1272 | struct inode *root_inode; |
| 1273 | |
| 1274 | static struct tree_descr smack_files[] = { |
| 1275 | [SMK_LOAD] = |
| 1276 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, |
| 1277 | [SMK_CIPSO] = |
| 1278 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, |
| 1279 | [SMK_DOI] = |
| 1280 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, |
| 1281 | [SMK_DIRECT] = |
| 1282 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, |
| 1283 | [SMK_AMBIENT] = |
| 1284 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1285 | [SMK_NETLBLADDR] = |
| 1286 | {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1287 | [SMK_ONLYCAP] = |
| 1288 | {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1289 | [SMK_LOGGING] = |
| 1290 | {"logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1291 | /* last one */ {""} |
| 1292 | }; |
| 1293 | |
| 1294 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); |
| 1295 | if (rc != 0) { |
| 1296 | printk(KERN_ERR "%s failed %d while creating inodes\n", |
| 1297 | __func__, rc); |
| 1298 | return rc; |
| 1299 | } |
| 1300 | |
| 1301 | root_inode = sb->s_root->d_inode; |
| 1302 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); |
| 1303 | |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
| 1307 | /** |
| 1308 | * smk_get_sb - get the smackfs superblock |
| 1309 | * @fs_type: passed along without comment |
| 1310 | * @flags: passed along without comment |
| 1311 | * @dev_name: passed along without comment |
| 1312 | * @data: passed along without comment |
| 1313 | * @mnt: passed along without comment |
| 1314 | * |
| 1315 | * Just passes everything along. |
| 1316 | * |
| 1317 | * Returns what the lower level code does. |
| 1318 | */ |
| 1319 | static int smk_get_sb(struct file_system_type *fs_type, |
| 1320 | int flags, const char *dev_name, void *data, |
| 1321 | struct vfsmount *mnt) |
| 1322 | { |
| 1323 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); |
| 1324 | } |
| 1325 | |
| 1326 | static struct file_system_type smk_fs_type = { |
| 1327 | .name = "smackfs", |
| 1328 | .get_sb = smk_get_sb, |
| 1329 | .kill_sb = kill_litter_super, |
| 1330 | }; |
| 1331 | |
| 1332 | static struct vfsmount *smackfs_mount; |
| 1333 | |
| 1334 | /** |
| 1335 | * init_smk_fs - get the smackfs superblock |
| 1336 | * |
| 1337 | * register the smackfs |
| 1338 | * |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 1339 | * Do not register smackfs if Smack wasn't enabled |
| 1340 | * on boot. We can not put this method normally under the |
| 1341 | * smack_init() code path since the security subsystem get |
| 1342 | * initialized before the vfs caches. |
| 1343 | * |
| 1344 | * Returns true if we were not chosen on boot or if |
| 1345 | * we were chosen and filesystem registration succeeded. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1346 | */ |
| 1347 | static int __init init_smk_fs(void) |
| 1348 | { |
| 1349 | int err; |
| 1350 | |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 1351 | if (!security_module_enable(&smack_ops)) |
| 1352 | return 0; |
| 1353 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1354 | err = register_filesystem(&smk_fs_type); |
| 1355 | if (!err) { |
| 1356 | smackfs_mount = kern_mount(&smk_fs_type); |
| 1357 | if (IS_ERR(smackfs_mount)) { |
| 1358 | printk(KERN_ERR "smackfs: could not mount!\n"); |
| 1359 | err = PTR_ERR(smackfs_mount); |
| 1360 | smackfs_mount = NULL; |
| 1361 | } |
| 1362 | } |
| 1363 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1364 | smk_cipso_doi(); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1365 | smk_unlbl_ambient(NULL); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1366 | |
| 1367 | return err; |
| 1368 | } |
| 1369 | |
| 1370 | __initcall(init_smk_fs); |