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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2011-07-08 00:22:41 -0400
committerJames Morris <jmorris@namei.org>2011-07-10 21:05:32 -0400
commit8761afd49ebff8ae04c1a7888af090177441d07d (patch)
treef43b52e1b8467eeea465762d2f9d0b81a336faa0 /security/tomoyo/condition.c
parent2066a36125fcbf5220990173b9d8e8bc49ad7538 (diff)
TOMOYO: Allow using owner/group etc. of file objects as conditions.
This patch adds support for permission checks using file object's DAC attributes (e.g. owner/group) when checking file's pathnames. Hooks for passing file object's pointers are in the last patch of this pathset. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/condition.c')
-rw-r--r--security/tomoyo/condition.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c
index 0692df3cddcc..ac7ebeb47d7d 100644
--- a/security/tomoyo/condition.c
+++ b/security/tomoyo/condition.c
@@ -244,6 +244,54 @@ out:
244} 244}
245 245
246/** 246/**
247 * tomoyo_get_attributes - Revalidate "struct inode".
248 *
249 * @obj: Pointer to "struct tomoyo_obj_info".
250 *
251 * Returns nothing.
252 */
253void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
254{
255 u8 i;
256 struct dentry *dentry = NULL;
257
258 for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
259 struct inode *inode;
260 switch (i) {
261 case TOMOYO_PATH1:
262 dentry = obj->path1.dentry;
263 if (!dentry)
264 continue;
265 break;
266 case TOMOYO_PATH2:
267 dentry = obj->path2.dentry;
268 if (!dentry)
269 continue;
270 break;
271 default:
272 if (!dentry)
273 continue;
274 dentry = dget_parent(dentry);
275 break;
276 }
277 inode = dentry->d_inode;
278 if (inode) {
279 struct tomoyo_mini_stat *stat = &obj->stat[i];
280 stat->uid = inode->i_uid;
281 stat->gid = inode->i_gid;
282 stat->ino = inode->i_ino;
283 stat->mode = inode->i_mode;
284 stat->dev = inode->i_sb->s_dev;
285 stat->rdev = inode->i_rdev;
286 obj->stat_valid[i] = true;
287 }
288 if (i & 1) /* i == TOMOYO_PATH1_PARENT ||
289 i == TOMOYO_PATH2_PARENT */
290 dput(dentry);
291 }
292}
293
294/**
247 * tomoyo_condition - Check condition part. 295 * tomoyo_condition - Check condition part.
248 * 296 *
249 * @r: Pointer to "struct tomoyo_request_info". 297 * @r: Pointer to "struct tomoyo_request_info".
@@ -261,16 +309,19 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
261 unsigned long max_v[2] = { 0, 0 }; 309 unsigned long max_v[2] = { 0, 0 };
262 const struct tomoyo_condition_element *condp; 310 const struct tomoyo_condition_element *condp;
263 const struct tomoyo_number_union *numbers_p; 311 const struct tomoyo_number_union *numbers_p;
312 struct tomoyo_obj_info *obj;
264 u16 condc; 313 u16 condc;
265 if (!cond) 314 if (!cond)
266 return true; 315 return true;
267 condc = cond->condc; 316 condc = cond->condc;
317 obj = r->obj;
268 condp = (struct tomoyo_condition_element *) (cond + 1); 318 condp = (struct tomoyo_condition_element *) (cond + 1);
269 numbers_p = (const struct tomoyo_number_union *) (condp + condc); 319 numbers_p = (const struct tomoyo_number_union *) (condp + condc);
270 for (i = 0; i < condc; i++) { 320 for (i = 0; i < condc; i++) {
271 const bool match = condp->equals; 321 const bool match = condp->equals;
272 const u8 left = condp->left; 322 const u8 left = condp->left;
273 const u8 right = condp->right; 323 const u8 right = condp->right;
324 bool is_bitop[2] = { false, false };
274 u8 j; 325 u8 j;
275 condp++; 326 condp++;
276 /* Check numeric or bit-op expressions. */ 327 /* Check numeric or bit-op expressions. */
@@ -308,14 +359,185 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
308 case TOMOYO_TASK_PPID: 359 case TOMOYO_TASK_PPID:
309 value = tomoyo_sys_getppid(); 360 value = tomoyo_sys_getppid();
310 break; 361 break;
362 case TOMOYO_TYPE_IS_SOCKET:
363 value = S_IFSOCK;
364 break;
365 case TOMOYO_TYPE_IS_SYMLINK:
366 value = S_IFLNK;
367 break;
368 case TOMOYO_TYPE_IS_FILE:
369 value = S_IFREG;
370 break;
371 case TOMOYO_TYPE_IS_BLOCK_DEV:
372 value = S_IFBLK;
373 break;
374 case TOMOYO_TYPE_IS_DIRECTORY:
375 value = S_IFDIR;
376 break;
377 case TOMOYO_TYPE_IS_CHAR_DEV:
378 value = S_IFCHR;
379 break;
380 case TOMOYO_TYPE_IS_FIFO:
381 value = S_IFIFO;
382 break;
383 case TOMOYO_MODE_SETUID:
384 value = S_ISUID;
385 break;
386 case TOMOYO_MODE_SETGID:
387 value = S_ISGID;
388 break;
389 case TOMOYO_MODE_STICKY:
390 value = S_ISVTX;
391 break;
392 case TOMOYO_MODE_OWNER_READ:
393 value = S_IRUSR;
394 break;
395 case TOMOYO_MODE_OWNER_WRITE:
396 value = S_IWUSR;
397 break;
398 case TOMOYO_MODE_OWNER_EXECUTE:
399 value = S_IXUSR;
400 break;
401 case TOMOYO_MODE_GROUP_READ:
402 value = S_IRGRP;
403 break;
404 case TOMOYO_MODE_GROUP_WRITE:
405 value = S_IWGRP;
406 break;
407 case TOMOYO_MODE_GROUP_EXECUTE:
408 value = S_IXGRP;
409 break;
410 case TOMOYO_MODE_OTHERS_READ:
411 value = S_IROTH;
412 break;
413 case TOMOYO_MODE_OTHERS_WRITE:
414 value = S_IWOTH;
415 break;
416 case TOMOYO_MODE_OTHERS_EXECUTE:
417 value = S_IXOTH;
418 break;
311 case TOMOYO_NUMBER_UNION: 419 case TOMOYO_NUMBER_UNION:
312 /* Fetch values later. */ 420 /* Fetch values later. */
313 break; 421 break;
314 default: 422 default:
423 if (!obj)
424 goto out;
425 if (!obj->validate_done) {
426 tomoyo_get_attributes(obj);
427 obj->validate_done = true;
428 }
429 {
430 u8 stat_index;
431 struct tomoyo_mini_stat *stat;
432 switch (index) {
433 case TOMOYO_PATH1_UID:
434 case TOMOYO_PATH1_GID:
435 case TOMOYO_PATH1_INO:
436 case TOMOYO_PATH1_MAJOR:
437 case TOMOYO_PATH1_MINOR:
438 case TOMOYO_PATH1_TYPE:
439 case TOMOYO_PATH1_DEV_MAJOR:
440 case TOMOYO_PATH1_DEV_MINOR:
441 case TOMOYO_PATH1_PERM:
442 stat_index = TOMOYO_PATH1;
443 break;
444 case TOMOYO_PATH2_UID:
445 case TOMOYO_PATH2_GID:
446 case TOMOYO_PATH2_INO:
447 case TOMOYO_PATH2_MAJOR:
448 case TOMOYO_PATH2_MINOR:
449 case TOMOYO_PATH2_TYPE:
450 case TOMOYO_PATH2_DEV_MAJOR:
451 case TOMOYO_PATH2_DEV_MINOR:
452 case TOMOYO_PATH2_PERM:
453 stat_index = TOMOYO_PATH2;
454 break;
455 case TOMOYO_PATH1_PARENT_UID:
456 case TOMOYO_PATH1_PARENT_GID:
457 case TOMOYO_PATH1_PARENT_INO:
458 case TOMOYO_PATH1_PARENT_PERM:
459 stat_index =
460 TOMOYO_PATH1_PARENT;
461 break;
462 case TOMOYO_PATH2_PARENT_UID:
463 case TOMOYO_PATH2_PARENT_GID:
464 case TOMOYO_PATH2_PARENT_INO:
465 case TOMOYO_PATH2_PARENT_PERM:
466 stat_index =
467 TOMOYO_PATH2_PARENT;
468 break;
469 default:
470 goto out;
471 }
472 if (!obj->stat_valid[stat_index])
473 goto out;
474 stat = &obj->stat[stat_index];
475 switch (index) {
476 case TOMOYO_PATH1_UID:
477 case TOMOYO_PATH2_UID:
478 case TOMOYO_PATH1_PARENT_UID:
479 case TOMOYO_PATH2_PARENT_UID:
480 value = stat->uid;
481 break;
482 case TOMOYO_PATH1_GID:
483 case TOMOYO_PATH2_GID:
484 case TOMOYO_PATH1_PARENT_GID:
485 case TOMOYO_PATH2_PARENT_GID:
486 value = stat->gid;
487 break;
488 case TOMOYO_PATH1_INO:
489 case TOMOYO_PATH2_INO:
490 case TOMOYO_PATH1_PARENT_INO:
491 case TOMOYO_PATH2_PARENT_INO:
492 value = stat->ino;
493 break;
494 case TOMOYO_PATH1_MAJOR:
495 case TOMOYO_PATH2_MAJOR:
496 value = MAJOR(stat->dev);
497 break;
498 case TOMOYO_PATH1_MINOR:
499 case TOMOYO_PATH2_MINOR:
500 value = MINOR(stat->dev);
501 break;
502 case TOMOYO_PATH1_TYPE:
503 case TOMOYO_PATH2_TYPE:
504 value = stat->mode & S_IFMT;
505 break;
506 case TOMOYO_PATH1_DEV_MAJOR:
507 case TOMOYO_PATH2_DEV_MAJOR:
508 value = MAJOR(stat->rdev);
509 break;
510 case TOMOYO_PATH1_DEV_MINOR:
511 case TOMOYO_PATH2_DEV_MINOR:
512 value = MINOR(stat->rdev);
513 break;
514 case TOMOYO_PATH1_PERM:
515 case TOMOYO_PATH2_PERM:
516 case TOMOYO_PATH1_PARENT_PERM:
517 case TOMOYO_PATH2_PARENT_PERM:
518 value = stat->mode & S_IALLUGO;
519 break;
520 }
521 }
315 break; 522 break;
316 } 523 }
317 max_v[j] = value; 524 max_v[j] = value;
318 min_v[j] = value; 525 min_v[j] = value;
526 switch (index) {
527 case TOMOYO_MODE_SETUID:
528 case TOMOYO_MODE_SETGID:
529 case TOMOYO_MODE_STICKY:
530 case TOMOYO_MODE_OWNER_READ:
531 case TOMOYO_MODE_OWNER_WRITE:
532 case TOMOYO_MODE_OWNER_EXECUTE:
533 case TOMOYO_MODE_GROUP_READ:
534 case TOMOYO_MODE_GROUP_WRITE:
535 case TOMOYO_MODE_GROUP_EXECUTE:
536 case TOMOYO_MODE_OTHERS_READ:
537 case TOMOYO_MODE_OTHERS_WRITE:
538 case TOMOYO_MODE_OTHERS_EXECUTE:
539 is_bitop[j] = true;
540 }
319 } 541 }
320 if (left == TOMOYO_NUMBER_UNION) { 542 if (left == TOMOYO_NUMBER_UNION) {
321 /* Fetch values now. */ 543 /* Fetch values now. */
@@ -339,6 +561,33 @@ bool tomoyo_condition(struct tomoyo_request_info *r,
339 } 561 }
340 goto out; 562 goto out;
341 } 563 }
564 /*
565 * Bit operation is valid only when counterpart value
566 * represents permission.
567 */
568 if (is_bitop[0] && is_bitop[1]) {
569 goto out;
570 } else if (is_bitop[0]) {
571 switch (right) {
572 case TOMOYO_PATH1_PERM:
573 case TOMOYO_PATH1_PARENT_PERM:
574 case TOMOYO_PATH2_PERM:
575 case TOMOYO_PATH2_PARENT_PERM:
576 if (!(max_v[0] & max_v[1]) == !match)
577 continue;
578 }
579 goto out;
580 } else if (is_bitop[1]) {
581 switch (left) {
582 case TOMOYO_PATH1_PERM:
583 case TOMOYO_PATH1_PARENT_PERM:
584 case TOMOYO_PATH2_PERM:
585 case TOMOYO_PATH2_PARENT_PERM:
586 if (!(max_v[0] & max_v[1]) == !match)
587 continue;
588 }
589 goto out;
590 }
342 /* Normal value range comparison. */ 591 /* Normal value range comparison. */
343 if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match) 592 if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
344 continue; 593 continue;
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