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> |
| 23 | #include <net/netlabel.h> |
| 24 | #include <net/cipso_ipv4.h> |
| 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/ctype.h> |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 27 | #include <linux/audit.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 28 | #include "smack.h" |
| 29 | |
| 30 | /* |
| 31 | * smackfs pseudo filesystem. |
| 32 | */ |
| 33 | |
| 34 | enum smk_inos { |
| 35 | SMK_ROOT_INO = 2, |
| 36 | SMK_LOAD = 3, /* load policy */ |
| 37 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ |
| 38 | SMK_DOI = 5, /* CIPSO DOI */ |
| 39 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ |
| 40 | SMK_AMBIENT = 7, /* internet ambient label */ |
| 41 | SMK_NLTYPE = 8, /* label scheme to use by default */ |
| 42 | }; |
| 43 | |
| 44 | /* |
| 45 | * List locks |
| 46 | */ |
| 47 | static DEFINE_MUTEX(smack_list_lock); |
| 48 | static DEFINE_MUTEX(smack_cipso_lock); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 49 | static DEFINE_MUTEX(smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 50 | |
| 51 | /* |
| 52 | * This is the "ambient" label for network traffic. |
| 53 | * If it isn't somehow marked, use this. |
| 54 | * It can be reset via smackfs/ambient |
| 55 | */ |
| 56 | char *smack_net_ambient = smack_known_floor.smk_known; |
| 57 | |
| 58 | /* |
| 59 | * This is the default packet marking scheme for network traffic. |
| 60 | * It can be reset via smackfs/nltype |
| 61 | */ |
| 62 | int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4; |
| 63 | |
| 64 | /* |
| 65 | * This is the level in a CIPSO header that indicates a |
| 66 | * smack label is contained directly in the category set. |
| 67 | * It can be reset via smackfs/direct |
| 68 | */ |
| 69 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; |
| 70 | |
| 71 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
| 72 | struct smk_list_entry *smack_list; |
| 73 | |
| 74 | #define SEQ_READ_FINISHED 1 |
| 75 | |
| 76 | /* |
| 77 | * Disable concurrent writing open() operations |
| 78 | */ |
| 79 | static struct semaphore smack_write_sem; |
| 80 | |
| 81 | /* |
| 82 | * Values for parsing cipso rules |
| 83 | * SMK_DIGITLEN: Length of a digit field in a rule. |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 84 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
| 85 | * SMK_CIPSOMAX: Maximum possible cipso rule length. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 86 | */ |
| 87 | #define SMK_DIGITLEN 4 |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 88 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
| 89 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) |
| 90 | |
| 91 | /* |
| 92 | * Values for parsing MAC rules |
| 93 | * SMK_ACCESS: Maximum possible combination of access permissions |
| 94 | * SMK_ACCESSLEN: Maximum length for a rule access field |
| 95 | * SMK_LOADLEN: Smack rule length |
| 96 | */ |
| 97 | #define SMK_ACCESS "rwxa" |
| 98 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) |
| 99 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) |
| 100 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 101 | |
| 102 | /* |
| 103 | * Seq_file read operations for /smack/load |
| 104 | */ |
| 105 | |
| 106 | static void *load_seq_start(struct seq_file *s, loff_t *pos) |
| 107 | { |
| 108 | if (*pos == SEQ_READ_FINISHED) |
| 109 | return NULL; |
| 110 | |
| 111 | return smack_list; |
| 112 | } |
| 113 | |
| 114 | static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 115 | { |
| 116 | struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next; |
| 117 | |
| 118 | if (skp == NULL) |
| 119 | *pos = SEQ_READ_FINISHED; |
| 120 | |
| 121 | return skp; |
| 122 | } |
| 123 | |
| 124 | static int load_seq_show(struct seq_file *s, void *v) |
| 125 | { |
| 126 | struct smk_list_entry *slp = (struct smk_list_entry *) v; |
| 127 | struct smack_rule *srp = &slp->smk_rule; |
| 128 | |
| 129 | seq_printf(s, "%s %s", (char *)srp->smk_subject, |
| 130 | (char *)srp->smk_object); |
| 131 | |
| 132 | seq_putc(s, ' '); |
| 133 | |
| 134 | if (srp->smk_access & MAY_READ) |
| 135 | seq_putc(s, 'r'); |
| 136 | if (srp->smk_access & MAY_WRITE) |
| 137 | seq_putc(s, 'w'); |
| 138 | if (srp->smk_access & MAY_EXEC) |
| 139 | seq_putc(s, 'x'); |
| 140 | if (srp->smk_access & MAY_APPEND) |
| 141 | seq_putc(s, 'a'); |
| 142 | if (srp->smk_access == 0) |
| 143 | seq_putc(s, '-'); |
| 144 | |
| 145 | seq_putc(s, '\n'); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static void load_seq_stop(struct seq_file *s, void *v) |
| 151 | { |
| 152 | /* No-op */ |
| 153 | } |
| 154 | |
| 155 | static struct seq_operations load_seq_ops = { |
| 156 | .start = load_seq_start, |
| 157 | .next = load_seq_next, |
| 158 | .show = load_seq_show, |
| 159 | .stop = load_seq_stop, |
| 160 | }; |
| 161 | |
| 162 | /** |
| 163 | * smk_open_load - open() for /smack/load |
| 164 | * @inode: inode structure representing file |
| 165 | * @file: "load" file pointer |
| 166 | * |
| 167 | * For reading, use load_seq_* seq_file reading operations. |
| 168 | */ |
| 169 | static int smk_open_load(struct inode *inode, struct file *file) |
| 170 | { |
| 171 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) |
| 172 | return seq_open(file, &load_seq_ops); |
| 173 | |
| 174 | if (down_interruptible(&smack_write_sem)) |
| 175 | return -ERESTARTSYS; |
| 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * smk_release_load - release() for /smack/load |
| 182 | * @inode: inode structure representing file |
| 183 | * @file: "load" file pointer |
| 184 | * |
| 185 | * For a reading session, use the seq_file release |
| 186 | * implementation. |
| 187 | * Otherwise, we are at the end of a writing session so |
| 188 | * clean everything up. |
| 189 | */ |
| 190 | static int smk_release_load(struct inode *inode, struct file *file) |
| 191 | { |
| 192 | if ((file->f_flags & O_ACCMODE) == O_RDONLY) |
| 193 | return seq_release(inode, file); |
| 194 | |
| 195 | up(&smack_write_sem); |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * smk_set_access - add a rule to the rule list |
| 201 | * @srp: the new rule to add |
| 202 | * |
| 203 | * Looks through the current subject/object/access list for |
| 204 | * the subject/object pair and replaces the access that was |
| 205 | * there. If the pair isn't found add it with the specified |
| 206 | * access. |
| 207 | */ |
| 208 | static void smk_set_access(struct smack_rule *srp) |
| 209 | { |
| 210 | struct smk_list_entry *sp; |
| 211 | struct smk_list_entry *newp; |
| 212 | |
| 213 | mutex_lock(&smack_list_lock); |
| 214 | |
| 215 | for (sp = smack_list; sp != NULL; sp = sp->smk_next) |
| 216 | if (sp->smk_rule.smk_subject == srp->smk_subject && |
| 217 | sp->smk_rule.smk_object == srp->smk_object) { |
| 218 | sp->smk_rule.smk_access = srp->smk_access; |
| 219 | break; |
| 220 | } |
| 221 | |
| 222 | if (sp == NULL) { |
| 223 | newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL); |
| 224 | newp->smk_rule = *srp; |
| 225 | newp->smk_next = smack_list; |
| 226 | smack_list = newp; |
| 227 | } |
| 228 | |
| 229 | mutex_unlock(&smack_list_lock); |
| 230 | |
| 231 | return; |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * smk_write_load - write() for /smack/load |
| 236 | * @filp: file pointer, not actually used |
| 237 | * @buf: where to get the data from |
| 238 | * @count: bytes sent |
| 239 | * @ppos: where to start - must be 0 |
| 240 | * |
| 241 | * Get one smack access rule from above. |
| 242 | * The format is exactly: |
| 243 | * char subject[SMK_LABELLEN] |
| 244 | * char object[SMK_LABELLEN] |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 245 | * char access[SMK_ACCESSLEN] |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 246 | * |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 247 | * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 248 | */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 249 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
| 250 | size_t count, loff_t *ppos) |
| 251 | { |
| 252 | struct smack_rule rule; |
| 253 | char *data; |
| 254 | int rc = -EINVAL; |
| 255 | |
| 256 | /* |
| 257 | * Must have privilege. |
| 258 | * No partial writes. |
| 259 | * Enough data must be present. |
| 260 | */ |
| 261 | if (!capable(CAP_MAC_ADMIN)) |
| 262 | return -EPERM; |
| 263 | if (*ppos != 0) |
| 264 | return -EINVAL; |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 265 | if (count != SMK_LOADLEN) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 266 | return -EINVAL; |
| 267 | |
| 268 | data = kzalloc(count, GFP_KERNEL); |
| 269 | if (data == NULL) |
| 270 | return -ENOMEM; |
| 271 | |
| 272 | if (copy_from_user(data, buf, count) != 0) { |
| 273 | rc = -EFAULT; |
| 274 | goto out; |
| 275 | } |
| 276 | |
| 277 | rule.smk_subject = smk_import(data, 0); |
| 278 | if (rule.smk_subject == NULL) |
| 279 | goto out; |
| 280 | |
| 281 | rule.smk_object = smk_import(data + SMK_LABELLEN, 0); |
| 282 | if (rule.smk_object == NULL) |
| 283 | goto out; |
| 284 | |
| 285 | rule.smk_access = 0; |
| 286 | |
| 287 | switch (data[SMK_LABELLEN + SMK_LABELLEN]) { |
| 288 | case '-': |
| 289 | break; |
| 290 | case 'r': |
| 291 | case 'R': |
| 292 | rule.smk_access |= MAY_READ; |
| 293 | break; |
| 294 | default: |
| 295 | goto out; |
| 296 | } |
| 297 | |
| 298 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) { |
| 299 | case '-': |
| 300 | break; |
| 301 | case 'w': |
| 302 | case 'W': |
| 303 | rule.smk_access |= MAY_WRITE; |
| 304 | break; |
| 305 | default: |
| 306 | goto out; |
| 307 | } |
| 308 | |
| 309 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) { |
| 310 | case '-': |
| 311 | break; |
| 312 | case 'x': |
| 313 | case 'X': |
| 314 | rule.smk_access |= MAY_EXEC; |
| 315 | break; |
| 316 | default: |
| 317 | goto out; |
| 318 | } |
| 319 | |
| 320 | switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) { |
| 321 | case '-': |
| 322 | break; |
| 323 | case 'a': |
| 324 | case 'A': |
| 325 | rule.smk_access |= MAY_READ; |
| 326 | break; |
| 327 | default: |
| 328 | goto out; |
| 329 | } |
| 330 | |
| 331 | smk_set_access(&rule); |
| 332 | rc = count; |
| 333 | |
| 334 | out: |
| 335 | kfree(data); |
| 336 | return rc; |
| 337 | } |
| 338 | |
| 339 | static const struct file_operations smk_load_ops = { |
| 340 | .open = smk_open_load, |
| 341 | .read = seq_read, |
| 342 | .llseek = seq_lseek, |
| 343 | .write = smk_write_load, |
| 344 | .release = smk_release_load, |
| 345 | }; |
| 346 | |
| 347 | /** |
| 348 | * smk_cipso_doi - initialize the CIPSO domain |
| 349 | */ |
| 350 | void smk_cipso_doi(void) |
| 351 | { |
| 352 | int rc; |
| 353 | struct cipso_v4_doi *doip; |
| 354 | struct netlbl_audit audit_info; |
| 355 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 356 | audit_info.loginuid = audit_get_loginuid(current); |
| 357 | audit_info.secid = smack_to_secid(current->security); |
| 358 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 359 | rc = netlbl_cfg_map_del(NULL, &audit_info); |
| 360 | if (rc != 0) |
| 361 | printk(KERN_WARNING "%s:%d remove rc = %d\n", |
| 362 | __func__, __LINE__, rc); |
| 363 | |
| 364 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); |
| 365 | if (doip == NULL) |
| 366 | panic("smack: Failed to initialize cipso DOI.\n"); |
| 367 | doip->map.std = NULL; |
| 368 | doip->doi = smk_cipso_doi_value; |
| 369 | doip->type = CIPSO_V4_MAP_PASS; |
| 370 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; |
| 371 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) |
| 372 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; |
| 373 | |
| 374 | rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info); |
| 375 | if (rc != 0) |
| 376 | printk(KERN_WARNING "%s:%d add rc = %d\n", |
| 377 | __func__, __LINE__, rc); |
| 378 | } |
| 379 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 380 | /** |
| 381 | * smk_unlbl_ambient - initialize the unlabeled domain |
| 382 | */ |
| 383 | void smk_unlbl_ambient(char *oldambient) |
| 384 | { |
| 385 | int rc; |
| 386 | struct netlbl_audit audit_info; |
| 387 | |
| 388 | audit_info.loginuid = audit_get_loginuid(current); |
| 389 | audit_info.secid = smack_to_secid(current->security); |
| 390 | |
| 391 | if (oldambient != NULL) { |
| 392 | rc = netlbl_cfg_map_del(oldambient, &audit_info); |
| 393 | if (rc != 0) |
| 394 | printk(KERN_WARNING "%s:%d remove rc = %d\n", |
| 395 | __func__, __LINE__, rc); |
| 396 | } |
| 397 | |
| 398 | rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info); |
| 399 | if (rc != 0) |
| 400 | printk(KERN_WARNING "%s:%d add rc = %d\n", |
| 401 | __func__, __LINE__, rc); |
| 402 | } |
| 403 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 404 | /* |
| 405 | * Seq_file read operations for /smack/cipso |
| 406 | */ |
| 407 | |
| 408 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) |
| 409 | { |
| 410 | if (*pos == SEQ_READ_FINISHED) |
| 411 | return NULL; |
| 412 | |
| 413 | return smack_known; |
| 414 | } |
| 415 | |
| 416 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 417 | { |
| 418 | struct smack_known *skp = ((struct smack_known *) v)->smk_next; |
| 419 | |
| 420 | /* |
| 421 | * Omit labels with no associated cipso value |
| 422 | */ |
| 423 | while (skp != NULL && !skp->smk_cipso) |
| 424 | skp = skp->smk_next; |
| 425 | |
| 426 | if (skp == NULL) |
| 427 | *pos = SEQ_READ_FINISHED; |
| 428 | |
| 429 | return skp; |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * Print cipso labels in format: |
| 434 | * label level[/cat[,cat]] |
| 435 | */ |
| 436 | static int cipso_seq_show(struct seq_file *s, void *v) |
| 437 | { |
| 438 | struct smack_known *skp = (struct smack_known *) v; |
| 439 | struct smack_cipso *scp = skp->smk_cipso; |
| 440 | char *cbp; |
| 441 | char sep = '/'; |
| 442 | int cat = 1; |
| 443 | int i; |
| 444 | unsigned char m; |
| 445 | |
| 446 | if (scp == NULL) |
| 447 | return 0; |
| 448 | |
| 449 | seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level); |
| 450 | |
| 451 | cbp = scp->smk_catset; |
| 452 | for (i = 0; i < SMK_LABELLEN; i++) |
| 453 | for (m = 0x80; m != 0; m >>= 1) { |
| 454 | if (m & cbp[i]) { |
| 455 | seq_printf(s, "%c%d", sep, cat); |
| 456 | sep = ','; |
| 457 | } |
| 458 | cat++; |
| 459 | } |
| 460 | |
| 461 | seq_putc(s, '\n'); |
| 462 | |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | static void cipso_seq_stop(struct seq_file *s, void *v) |
| 467 | { |
| 468 | /* No-op */ |
| 469 | } |
| 470 | |
| 471 | static struct seq_operations cipso_seq_ops = { |
| 472 | .start = cipso_seq_start, |
| 473 | .stop = cipso_seq_stop, |
| 474 | .next = cipso_seq_next, |
| 475 | .show = cipso_seq_show, |
| 476 | }; |
| 477 | |
| 478 | /** |
| 479 | * smk_open_cipso - open() for /smack/cipso |
| 480 | * @inode: inode structure representing file |
| 481 | * @file: "cipso" file pointer |
| 482 | * |
| 483 | * Connect our cipso_seq_* operations with /smack/cipso |
| 484 | * file_operations |
| 485 | */ |
| 486 | static int smk_open_cipso(struct inode *inode, struct file *file) |
| 487 | { |
| 488 | return seq_open(file, &cipso_seq_ops); |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | * smk_write_cipso - write() for /smack/cipso |
| 493 | * @filp: file pointer, not actually used |
| 494 | * @buf: where to get the data from |
| 495 | * @count: bytes sent |
| 496 | * @ppos: where to start |
| 497 | * |
| 498 | * Accepts only one cipso rule per write call. |
| 499 | * Returns number of bytes written or error code, as appropriate |
| 500 | */ |
| 501 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, |
| 502 | size_t count, loff_t *ppos) |
| 503 | { |
| 504 | struct smack_known *skp; |
| 505 | struct smack_cipso *scp = NULL; |
| 506 | char mapcatset[SMK_LABELLEN]; |
| 507 | int maplevel; |
| 508 | int cat; |
| 509 | int catlen; |
| 510 | ssize_t rc = -EINVAL; |
| 511 | char *data = NULL; |
| 512 | char *rule; |
| 513 | int ret; |
| 514 | int i; |
| 515 | |
| 516 | /* |
| 517 | * Must have privilege. |
| 518 | * No partial writes. |
| 519 | * Enough data must be present. |
| 520 | */ |
| 521 | if (!capable(CAP_MAC_ADMIN)) |
| 522 | return -EPERM; |
| 523 | if (*ppos != 0) |
| 524 | return -EINVAL; |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 525 | if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 526 | return -EINVAL; |
| 527 | |
| 528 | data = kzalloc(count + 1, GFP_KERNEL); |
| 529 | if (data == NULL) |
| 530 | return -ENOMEM; |
| 531 | |
| 532 | if (copy_from_user(data, buf, count) != 0) { |
| 533 | rc = -EFAULT; |
| 534 | goto unlockedout; |
| 535 | } |
| 536 | |
| 537 | data[count] = '\0'; |
| 538 | rule = data; |
| 539 | /* |
| 540 | * Only allow one writer at a time. Writes should be |
| 541 | * quite rare and small in any case. |
| 542 | */ |
| 543 | mutex_lock(&smack_cipso_lock); |
| 544 | |
| 545 | skp = smk_import_entry(rule, 0); |
| 546 | if (skp == NULL) |
| 547 | goto out; |
| 548 | |
| 549 | rule += SMK_LABELLEN;; |
| 550 | ret = sscanf(rule, "%d", &maplevel); |
| 551 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) |
| 552 | goto out; |
| 553 | |
| 554 | rule += SMK_DIGITLEN; |
| 555 | ret = sscanf(rule, "%d", &catlen); |
| 556 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) |
| 557 | goto out; |
| 558 | |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame^] | 559 | if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 560 | goto out; |
| 561 | |
| 562 | memset(mapcatset, 0, sizeof(mapcatset)); |
| 563 | |
| 564 | for (i = 0; i < catlen; i++) { |
| 565 | rule += SMK_DIGITLEN; |
| 566 | ret = sscanf(rule, "%d", &cat); |
| 567 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL) |
| 568 | goto out; |
| 569 | |
| 570 | smack_catset_bit(cat, mapcatset); |
| 571 | } |
| 572 | |
| 573 | if (skp->smk_cipso == NULL) { |
| 574 | scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL); |
| 575 | if (scp == NULL) { |
| 576 | rc = -ENOMEM; |
| 577 | goto out; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | spin_lock_bh(&skp->smk_cipsolock); |
| 582 | |
| 583 | if (scp == NULL) |
| 584 | scp = skp->smk_cipso; |
| 585 | else |
| 586 | skp->smk_cipso = scp; |
| 587 | |
| 588 | scp->smk_level = maplevel; |
| 589 | memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset)); |
| 590 | |
| 591 | spin_unlock_bh(&skp->smk_cipsolock); |
| 592 | |
| 593 | rc = count; |
| 594 | out: |
| 595 | mutex_unlock(&smack_cipso_lock); |
| 596 | unlockedout: |
| 597 | kfree(data); |
| 598 | return rc; |
| 599 | } |
| 600 | |
| 601 | static const struct file_operations smk_cipso_ops = { |
| 602 | .open = smk_open_cipso, |
| 603 | .read = seq_read, |
| 604 | .llseek = seq_lseek, |
| 605 | .write = smk_write_cipso, |
| 606 | .release = seq_release, |
| 607 | }; |
| 608 | |
| 609 | /** |
| 610 | * smk_read_doi - read() for /smack/doi |
| 611 | * @filp: file pointer, not actually used |
| 612 | * @buf: where to put the result |
| 613 | * @count: maximum to send along |
| 614 | * @ppos: where to start |
| 615 | * |
| 616 | * Returns number of bytes read or error code, as appropriate |
| 617 | */ |
| 618 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, |
| 619 | size_t count, loff_t *ppos) |
| 620 | { |
| 621 | char temp[80]; |
| 622 | ssize_t rc; |
| 623 | |
| 624 | if (*ppos != 0) |
| 625 | return 0; |
| 626 | |
| 627 | sprintf(temp, "%d", smk_cipso_doi_value); |
| 628 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 629 | |
| 630 | return rc; |
| 631 | } |
| 632 | |
| 633 | /** |
| 634 | * smk_write_doi - write() for /smack/doi |
| 635 | * @filp: file pointer, not actually used |
| 636 | * @buf: where to get the data from |
| 637 | * @count: bytes sent |
| 638 | * @ppos: where to start |
| 639 | * |
| 640 | * Returns number of bytes written or error code, as appropriate |
| 641 | */ |
| 642 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, |
| 643 | size_t count, loff_t *ppos) |
| 644 | { |
| 645 | char temp[80]; |
| 646 | int i; |
| 647 | |
| 648 | if (!capable(CAP_MAC_ADMIN)) |
| 649 | return -EPERM; |
| 650 | |
| 651 | if (count >= sizeof(temp) || count == 0) |
| 652 | return -EINVAL; |
| 653 | |
| 654 | if (copy_from_user(temp, buf, count) != 0) |
| 655 | return -EFAULT; |
| 656 | |
| 657 | temp[count] = '\0'; |
| 658 | |
| 659 | if (sscanf(temp, "%d", &i) != 1) |
| 660 | return -EINVAL; |
| 661 | |
| 662 | smk_cipso_doi_value = i; |
| 663 | |
| 664 | smk_cipso_doi(); |
| 665 | |
| 666 | return count; |
| 667 | } |
| 668 | |
| 669 | static const struct file_operations smk_doi_ops = { |
| 670 | .read = smk_read_doi, |
| 671 | .write = smk_write_doi, |
| 672 | }; |
| 673 | |
| 674 | /** |
| 675 | * smk_read_direct - read() for /smack/direct |
| 676 | * @filp: file pointer, not actually used |
| 677 | * @buf: where to put the result |
| 678 | * @count: maximum to send along |
| 679 | * @ppos: where to start |
| 680 | * |
| 681 | * Returns number of bytes read or error code, as appropriate |
| 682 | */ |
| 683 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, |
| 684 | size_t count, loff_t *ppos) |
| 685 | { |
| 686 | char temp[80]; |
| 687 | ssize_t rc; |
| 688 | |
| 689 | if (*ppos != 0) |
| 690 | return 0; |
| 691 | |
| 692 | sprintf(temp, "%d", smack_cipso_direct); |
| 693 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 694 | |
| 695 | return rc; |
| 696 | } |
| 697 | |
| 698 | /** |
| 699 | * smk_write_direct - write() for /smack/direct |
| 700 | * @filp: file pointer, not actually used |
| 701 | * @buf: where to get the data from |
| 702 | * @count: bytes sent |
| 703 | * @ppos: where to start |
| 704 | * |
| 705 | * Returns number of bytes written or error code, as appropriate |
| 706 | */ |
| 707 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, |
| 708 | size_t count, loff_t *ppos) |
| 709 | { |
| 710 | char temp[80]; |
| 711 | int i; |
| 712 | |
| 713 | if (!capable(CAP_MAC_ADMIN)) |
| 714 | return -EPERM; |
| 715 | |
| 716 | if (count >= sizeof(temp) || count == 0) |
| 717 | return -EINVAL; |
| 718 | |
| 719 | if (copy_from_user(temp, buf, count) != 0) |
| 720 | return -EFAULT; |
| 721 | |
| 722 | temp[count] = '\0'; |
| 723 | |
| 724 | if (sscanf(temp, "%d", &i) != 1) |
| 725 | return -EINVAL; |
| 726 | |
| 727 | smack_cipso_direct = i; |
| 728 | |
| 729 | return count; |
| 730 | } |
| 731 | |
| 732 | static const struct file_operations smk_direct_ops = { |
| 733 | .read = smk_read_direct, |
| 734 | .write = smk_write_direct, |
| 735 | }; |
| 736 | |
| 737 | /** |
| 738 | * smk_read_ambient - read() for /smack/ambient |
| 739 | * @filp: file pointer, not actually used |
| 740 | * @buf: where to put the result |
| 741 | * @cn: maximum to send along |
| 742 | * @ppos: where to start |
| 743 | * |
| 744 | * Returns number of bytes read or error code, as appropriate |
| 745 | */ |
| 746 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, |
| 747 | size_t cn, loff_t *ppos) |
| 748 | { |
| 749 | ssize_t rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 750 | int asize; |
| 751 | |
| 752 | if (*ppos != 0) |
| 753 | return 0; |
| 754 | /* |
| 755 | * Being careful to avoid a problem in the case where |
| 756 | * smack_net_ambient gets changed in midstream. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 757 | */ |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 758 | mutex_lock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 759 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 760 | asize = strlen(smack_net_ambient) + 1; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 761 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 762 | if (cn >= asize) |
| 763 | rc = simple_read_from_buffer(buf, cn, ppos, |
| 764 | smack_net_ambient, asize); |
| 765 | else |
| 766 | rc = -EINVAL; |
| 767 | |
| 768 | mutex_unlock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 769 | |
| 770 | return rc; |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * smk_write_ambient - write() for /smack/ambient |
| 775 | * @filp: file pointer, not actually used |
| 776 | * @buf: where to get the data from |
| 777 | * @count: bytes sent |
| 778 | * @ppos: where to start |
| 779 | * |
| 780 | * Returns number of bytes written or error code, as appropriate |
| 781 | */ |
| 782 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, |
| 783 | size_t count, loff_t *ppos) |
| 784 | { |
| 785 | char in[SMK_LABELLEN]; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 786 | char *oldambient; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 787 | char *smack; |
| 788 | |
| 789 | if (!capable(CAP_MAC_ADMIN)) |
| 790 | return -EPERM; |
| 791 | |
| 792 | if (count >= SMK_LABELLEN) |
| 793 | return -EINVAL; |
| 794 | |
| 795 | if (copy_from_user(in, buf, count) != 0) |
| 796 | return -EFAULT; |
| 797 | |
| 798 | smack = smk_import(in, count); |
| 799 | if (smack == NULL) |
| 800 | return -EINVAL; |
| 801 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 802 | mutex_lock(&smack_ambient_lock); |
| 803 | |
| 804 | oldambient = smack_net_ambient; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 805 | smack_net_ambient = smack; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 806 | smk_unlbl_ambient(oldambient); |
| 807 | |
| 808 | mutex_unlock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 809 | |
| 810 | return count; |
| 811 | } |
| 812 | |
| 813 | static const struct file_operations smk_ambient_ops = { |
| 814 | .read = smk_read_ambient, |
| 815 | .write = smk_write_ambient, |
| 816 | }; |
| 817 | |
| 818 | struct option_names { |
| 819 | int o_number; |
| 820 | char *o_name; |
| 821 | char *o_alias; |
| 822 | }; |
| 823 | |
| 824 | static struct option_names netlbl_choices[] = { |
| 825 | { NETLBL_NLTYPE_RIPSO, |
| 826 | NETLBL_NLTYPE_RIPSO_NAME, "ripso" }, |
| 827 | { NETLBL_NLTYPE_CIPSOV4, |
| 828 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" }, |
| 829 | { NETLBL_NLTYPE_CIPSOV4, |
| 830 | NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" }, |
| 831 | { NETLBL_NLTYPE_CIPSOV6, |
| 832 | NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" }, |
| 833 | { NETLBL_NLTYPE_UNLABELED, |
| 834 | NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" }, |
| 835 | }; |
| 836 | |
| 837 | /** |
| 838 | * smk_read_nltype - read() for /smack/nltype |
| 839 | * @filp: file pointer, not actually used |
| 840 | * @buf: where to put the result |
| 841 | * @count: maximum to send along |
| 842 | * @ppos: where to start |
| 843 | * |
| 844 | * Returns number of bytes read or error code, as appropriate |
| 845 | */ |
| 846 | static ssize_t smk_read_nltype(struct file *filp, char __user *buf, |
| 847 | size_t count, loff_t *ppos) |
| 848 | { |
| 849 | char bound[40]; |
| 850 | ssize_t rc; |
| 851 | int i; |
| 852 | |
| 853 | if (count < SMK_LABELLEN) |
| 854 | return -EINVAL; |
| 855 | |
| 856 | if (*ppos != 0) |
| 857 | return 0; |
| 858 | |
| 859 | sprintf(bound, "unknown"); |
| 860 | |
| 861 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) |
| 862 | if (smack_net_nltype == netlbl_choices[i].o_number) { |
| 863 | sprintf(bound, "%s", netlbl_choices[i].o_name); |
| 864 | break; |
| 865 | } |
| 866 | |
| 867 | rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound)); |
| 868 | |
| 869 | return rc; |
| 870 | } |
| 871 | |
| 872 | /** |
| 873 | * smk_write_nltype - write() for /smack/nltype |
| 874 | * @filp: file pointer, not actually used |
| 875 | * @buf: where to get the data from |
| 876 | * @count: bytes sent |
| 877 | * @ppos: where to start |
| 878 | * |
| 879 | * Returns number of bytes written or error code, as appropriate |
| 880 | */ |
| 881 | static ssize_t smk_write_nltype(struct file *file, const char __user *buf, |
| 882 | size_t count, loff_t *ppos) |
| 883 | { |
| 884 | char bound[40]; |
| 885 | char *cp; |
| 886 | int i; |
| 887 | |
| 888 | if (!capable(CAP_MAC_ADMIN)) |
| 889 | return -EPERM; |
| 890 | |
| 891 | if (count >= 40) |
| 892 | return -EINVAL; |
| 893 | |
| 894 | if (copy_from_user(bound, buf, count) != 0) |
| 895 | return -EFAULT; |
| 896 | |
| 897 | bound[count] = '\0'; |
| 898 | cp = strchr(bound, ' '); |
| 899 | if (cp != NULL) |
| 900 | *cp = '\0'; |
| 901 | cp = strchr(bound, '\n'); |
| 902 | if (cp != NULL) |
| 903 | *cp = '\0'; |
| 904 | |
| 905 | for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++) |
| 906 | if (strcmp(bound, netlbl_choices[i].o_name) == 0 || |
| 907 | strcmp(bound, netlbl_choices[i].o_alias) == 0) { |
| 908 | smack_net_nltype = netlbl_choices[i].o_number; |
| 909 | return count; |
| 910 | } |
| 911 | /* |
| 912 | * Not a valid choice. |
| 913 | */ |
| 914 | return -EINVAL; |
| 915 | } |
| 916 | |
| 917 | static const struct file_operations smk_nltype_ops = { |
| 918 | .read = smk_read_nltype, |
| 919 | .write = smk_write_nltype, |
| 920 | }; |
| 921 | |
| 922 | /** |
| 923 | * smk_fill_super - fill the /smackfs superblock |
| 924 | * @sb: the empty superblock |
| 925 | * @data: unused |
| 926 | * @silent: unused |
| 927 | * |
| 928 | * Fill in the well known entries for /smack |
| 929 | * |
| 930 | * Returns 0 on success, an error code on failure |
| 931 | */ |
| 932 | static int smk_fill_super(struct super_block *sb, void *data, int silent) |
| 933 | { |
| 934 | int rc; |
| 935 | struct inode *root_inode; |
| 936 | |
| 937 | static struct tree_descr smack_files[] = { |
| 938 | [SMK_LOAD] = |
| 939 | {"load", &smk_load_ops, S_IRUGO|S_IWUSR}, |
| 940 | [SMK_CIPSO] = |
| 941 | {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, |
| 942 | [SMK_DOI] = |
| 943 | {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, |
| 944 | [SMK_DIRECT] = |
| 945 | {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, |
| 946 | [SMK_AMBIENT] = |
| 947 | {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, |
| 948 | [SMK_NLTYPE] = |
| 949 | {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, |
| 950 | /* last one */ {""} |
| 951 | }; |
| 952 | |
| 953 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); |
| 954 | if (rc != 0) { |
| 955 | printk(KERN_ERR "%s failed %d while creating inodes\n", |
| 956 | __func__, rc); |
| 957 | return rc; |
| 958 | } |
| 959 | |
| 960 | root_inode = sb->s_root->d_inode; |
| 961 | root_inode->i_security = new_inode_smack(smack_known_floor.smk_known); |
| 962 | |
| 963 | return 0; |
| 964 | } |
| 965 | |
| 966 | /** |
| 967 | * smk_get_sb - get the smackfs superblock |
| 968 | * @fs_type: passed along without comment |
| 969 | * @flags: passed along without comment |
| 970 | * @dev_name: passed along without comment |
| 971 | * @data: passed along without comment |
| 972 | * @mnt: passed along without comment |
| 973 | * |
| 974 | * Just passes everything along. |
| 975 | * |
| 976 | * Returns what the lower level code does. |
| 977 | */ |
| 978 | static int smk_get_sb(struct file_system_type *fs_type, |
| 979 | int flags, const char *dev_name, void *data, |
| 980 | struct vfsmount *mnt) |
| 981 | { |
| 982 | return get_sb_single(fs_type, flags, data, smk_fill_super, mnt); |
| 983 | } |
| 984 | |
| 985 | static struct file_system_type smk_fs_type = { |
| 986 | .name = "smackfs", |
| 987 | .get_sb = smk_get_sb, |
| 988 | .kill_sb = kill_litter_super, |
| 989 | }; |
| 990 | |
| 991 | static struct vfsmount *smackfs_mount; |
| 992 | |
| 993 | /** |
| 994 | * init_smk_fs - get the smackfs superblock |
| 995 | * |
| 996 | * register the smackfs |
| 997 | * |
| 998 | * Returns 0 unless the registration fails. |
| 999 | */ |
| 1000 | static int __init init_smk_fs(void) |
| 1001 | { |
| 1002 | int err; |
| 1003 | |
| 1004 | err = register_filesystem(&smk_fs_type); |
| 1005 | if (!err) { |
| 1006 | smackfs_mount = kern_mount(&smk_fs_type); |
| 1007 | if (IS_ERR(smackfs_mount)) { |
| 1008 | printk(KERN_ERR "smackfs: could not mount!\n"); |
| 1009 | err = PTR_ERR(smackfs_mount); |
| 1010 | smackfs_mount = NULL; |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | sema_init(&smack_write_sem, 1); |
| 1015 | smk_cipso_doi(); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1016 | smk_unlbl_ambient(NULL); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1017 | |
| 1018 | return err; |
| 1019 | } |
| 1020 | |
| 1021 | __initcall(init_smk_fs); |