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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * security/tomoyo/file.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8#include "common.h"
9#include <linux/slab.h>
10
11/*
12 * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
13 */
14static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
15 [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE,
16 [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN,
17 [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN,
18 [TOMOYO_TYPE_APPEND] = TOMOYO_MAC_FILE_OPEN,
19 [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK,
20 [TOMOYO_TYPE_GETATTR] = TOMOYO_MAC_FILE_GETATTR,
21 [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR,
22 [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE,
23 [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK,
24 [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT,
25 [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT,
26};
27
28/*
29 * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
30 */
31const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
32 [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
33 [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR,
34};
35
36/*
37 * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
38 */
39const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
40 [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK,
41 [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME,
42 [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
43};
44
45/*
46 * Mapping table from "enum tomoyo_path_number_acl_index" to
47 * "enum tomoyo_mac_index".
48 */
49const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
50 [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
51 [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR,
52 [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
53 [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
54 [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL,
55 [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD,
56 [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN,
57 [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP,
58};
59
60/**
61 * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
62 *
63 * @ptr: Pointer to "struct tomoyo_name_union".
64 *
65 * Returns nothing.
66 */
67void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
68{
69 tomoyo_put_group(ptr->group);
70 tomoyo_put_name(ptr->filename);
71}
72
73/**
74 * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
75 *
76 * @name: Pointer to "struct tomoyo_path_info".
77 * @ptr: Pointer to "struct tomoyo_name_union".
78 *
79 * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
80 */
81const struct tomoyo_path_info *
82tomoyo_compare_name_union(const struct tomoyo_path_info *name,
83 const struct tomoyo_name_union *ptr)
84{
85 if (ptr->group)
86 return tomoyo_path_matches_group(name, ptr->group);
87 if (tomoyo_path_matches_pattern(name, ptr->filename))
88 return ptr->filename;
89 return NULL;
90}
91
92/**
93 * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
94 *
95 * @ptr: Pointer to "struct tomoyo_number_union".
96 *
97 * Returns nothing.
98 */
99void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
100{
101 tomoyo_put_group(ptr->group);
102}
103
104/**
105 * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
106 *
107 * @value: Number to check.
108 * @ptr: Pointer to "struct tomoyo_number_union".
109 *
110 * Returns true if @value matches @ptr, false otherwise.
111 */
112bool tomoyo_compare_number_union(const unsigned long value,
113 const struct tomoyo_number_union *ptr)
114{
115 if (ptr->group)
116 return tomoyo_number_matches_group(value, value, ptr->group);
117 return value >= ptr->values[0] && value <= ptr->values[1];
118}
119
120/**
121 * tomoyo_add_slash - Add trailing '/' if needed.
122 *
123 * @buf: Pointer to "struct tomoyo_path_info".
124 *
125 * Returns nothing.
126 *
127 * @buf must be generated by tomoyo_encode() because this function does not
128 * allocate memory for adding '/'.
129 */
130static void tomoyo_add_slash(struct tomoyo_path_info *buf)
131{
132 if (buf->is_dir)
133 return;
134 /*
135 * This is OK because tomoyo_encode() reserves space for appending "/".
136 */
137 strcat((char *) buf->name, "/");
138 tomoyo_fill_path_info(buf);
139}
140
141/**
142 * tomoyo_get_realpath - Get realpath.
143 *
144 * @buf: Pointer to "struct tomoyo_path_info".
145 * @path: Pointer to "struct path".
146 *
147 * Returns true on success, false otherwise.
148 */
149static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, const struct path *path)
150{
151 buf->name = tomoyo_realpath_from_path(path);
152 if (buf->name) {
153 tomoyo_fill_path_info(buf);
154 return true;
155 }
156 return false;
157}
158
159/**
160 * tomoyo_audit_path_log - Audit path request log.
161 *
162 * @r: Pointer to "struct tomoyo_request_info".
163 *
164 * Returns 0 on success, negative value otherwise.
165 */
166static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
167{
168 return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword
169 [r->param.path.operation],
170 r->param.path.filename->name);
171}
172
173/**
174 * tomoyo_audit_path2_log - Audit path/path request log.
175 *
176 * @r: Pointer to "struct tomoyo_request_info".
177 *
178 * Returns 0 on success, negative value otherwise.
179 */
180static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
181{
182 return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
183 [tomoyo_pp2mac[r->param.path2.operation]],
184 r->param.path2.filename1->name,
185 r->param.path2.filename2->name);
186}
187
188/**
189 * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
190 *
191 * @r: Pointer to "struct tomoyo_request_info".
192 *
193 * Returns 0 on success, negative value otherwise.
194 */
195static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
196{
197 return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n",
198 tomoyo_mac_keywords
199 [tomoyo_pnnn2mac[r->param.mkdev.operation]],
200 r->param.mkdev.filename->name,
201 r->param.mkdev.mode, r->param.mkdev.major,
202 r->param.mkdev.minor);
203}
204
205/**
206 * tomoyo_audit_path_number_log - Audit path/number request log.
207 *
208 * @r: Pointer to "struct tomoyo_request_info".
209 *
210 * Returns 0 on success, negative value otherwise.
211 */
212static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
213{
214 const u8 type = r->param.path_number.operation;
215 u8 radix;
216 char buffer[64];
217
218 switch (type) {
219 case TOMOYO_TYPE_CREATE:
220 case TOMOYO_TYPE_MKDIR:
221 case TOMOYO_TYPE_MKFIFO:
222 case TOMOYO_TYPE_MKSOCK:
223 case TOMOYO_TYPE_CHMOD:
224 radix = TOMOYO_VALUE_TYPE_OCTAL;
225 break;
226 case TOMOYO_TYPE_IOCTL:
227 radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
228 break;
229 default:
230 radix = TOMOYO_VALUE_TYPE_DECIMAL;
231 break;
232 }
233 tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
234 radix);
235 return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
236 [tomoyo_pn2mac[type]],
237 r->param.path_number.filename->name, buffer);
238}
239
240/**
241 * tomoyo_check_path_acl - Check permission for path operation.
242 *
243 * @r: Pointer to "struct tomoyo_request_info".
244 * @ptr: Pointer to "struct tomoyo_acl_info".
245 *
246 * Returns true if granted, false otherwise.
247 *
248 * To be able to use wildcard for domain transition, this function sets
249 * matching entry on success. Since the caller holds tomoyo_read_lock(),
250 * it is safe to set matching entry.
251 */
252static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
253 const struct tomoyo_acl_info *ptr)
254{
255 const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
256 head);
257
258 if (acl->perm & (1 << r->param.path.operation)) {
259 r->param.path.matched_path =
260 tomoyo_compare_name_union(r->param.path.filename,
261 &acl->name);
262 return r->param.path.matched_path != NULL;
263 }
264 return false;
265}
266
267/**
268 * tomoyo_check_path_number_acl - Check permission for path number operation.
269 *
270 * @r: Pointer to "struct tomoyo_request_info".
271 * @ptr: Pointer to "struct tomoyo_acl_info".
272 *
273 * Returns true if granted, false otherwise.
274 */
275static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
276 const struct tomoyo_acl_info *ptr)
277{
278 const struct tomoyo_path_number_acl *acl =
279 container_of(ptr, typeof(*acl), head);
280
281 return (acl->perm & (1 << r->param.path_number.operation)) &&
282 tomoyo_compare_number_union(r->param.path_number.number,
283 &acl->number) &&
284 tomoyo_compare_name_union(r->param.path_number.filename,
285 &acl->name);
286}
287
288/**
289 * tomoyo_check_path2_acl - Check permission for path path operation.
290 *
291 * @r: Pointer to "struct tomoyo_request_info".
292 * @ptr: Pointer to "struct tomoyo_acl_info".
293 *
294 * Returns true if granted, false otherwise.
295 */
296static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
297 const struct tomoyo_acl_info *ptr)
298{
299 const struct tomoyo_path2_acl *acl =
300 container_of(ptr, typeof(*acl), head);
301
302 return (acl->perm & (1 << r->param.path2.operation)) &&
303 tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
304 && tomoyo_compare_name_union(r->param.path2.filename2,
305 &acl->name2);
306}
307
308/**
309 * tomoyo_check_mkdev_acl - Check permission for path number number number operation.
310 *
311 * @r: Pointer to "struct tomoyo_request_info".
312 * @ptr: Pointer to "struct tomoyo_acl_info".
313 *
314 * Returns true if granted, false otherwise.
315 */
316static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
317 const struct tomoyo_acl_info *ptr)
318{
319 const struct tomoyo_mkdev_acl *acl =
320 container_of(ptr, typeof(*acl), head);
321
322 return (acl->perm & (1 << r->param.mkdev.operation)) &&
323 tomoyo_compare_number_union(r->param.mkdev.mode,
324 &acl->mode) &&
325 tomoyo_compare_number_union(r->param.mkdev.major,
326 &acl->major) &&
327 tomoyo_compare_number_union(r->param.mkdev.minor,
328 &acl->minor) &&
329 tomoyo_compare_name_union(r->param.mkdev.filename,
330 &acl->name);
331}
332
333/**
334 * tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
335 *
336 * @a: Pointer to "struct tomoyo_acl_info".
337 * @b: Pointer to "struct tomoyo_acl_info".
338 *
339 * Returns true if @a == @b except permission bits, false otherwise.
340 */
341static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
342 const struct tomoyo_acl_info *b)
343{
344 const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
345 const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
346
347 return tomoyo_same_name_union(&p1->name, &p2->name);
348}
349
350/**
351 * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
352 *
353 * @a: Pointer to "struct tomoyo_acl_info".
354 * @b: Pointer to "struct tomoyo_acl_info".
355 * @is_delete: True for @a &= ~@b, false for @a |= @b.
356 *
357 * Returns true if @a is empty, false otherwise.
358 */
359static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
360 struct tomoyo_acl_info *b,
361 const bool is_delete)
362{
363 u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
364 ->perm;
365 u16 perm = *a_perm;
366 const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
367
368 if (is_delete)
369 perm &= ~b_perm;
370 else
371 perm |= b_perm;
372 *a_perm = perm;
373 return !perm;
374}
375
376/**
377 * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
378 *
379 * @perm: Permission.
380 * @param: Pointer to "struct tomoyo_acl_param".
381 *
382 * Returns 0 on success, negative value otherwise.
383 *
384 * Caller holds tomoyo_read_lock().
385 */
386static int tomoyo_update_path_acl(const u16 perm,
387 struct tomoyo_acl_param *param)
388{
389 struct tomoyo_path_acl e = {
390 .head.type = TOMOYO_TYPE_PATH_ACL,
391 .perm = perm
392 };
393 int error;
394
395 if (!tomoyo_parse_name_union(param, &e.name))
396 error = -EINVAL;
397 else
398 error = tomoyo_update_domain(&e.head, sizeof(e), param,
399 tomoyo_same_path_acl,
400 tomoyo_merge_path_acl);
401 tomoyo_put_name_union(&e.name);
402 return error;
403}
404
405/**
406 * tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
407 *
408 * @a: Pointer to "struct tomoyo_acl_info".
409 * @b: Pointer to "struct tomoyo_acl_info".
410 *
411 * Returns true if @a == @b except permission bits, false otherwise.
412 */
413static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
414 const struct tomoyo_acl_info *b)
415{
416 const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
417 const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
418
419 return tomoyo_same_name_union(&p1->name, &p2->name) &&
420 tomoyo_same_number_union(&p1->mode, &p2->mode) &&
421 tomoyo_same_number_union(&p1->major, &p2->major) &&
422 tomoyo_same_number_union(&p1->minor, &p2->minor);
423}
424
425/**
426 * tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
427 *
428 * @a: Pointer to "struct tomoyo_acl_info".
429 * @b: Pointer to "struct tomoyo_acl_info".
430 * @is_delete: True for @a &= ~@b, false for @a |= @b.
431 *
432 * Returns true if @a is empty, false otherwise.
433 */
434static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
435 struct tomoyo_acl_info *b,
436 const bool is_delete)
437{
438 u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
439 head)->perm;
440 u8 perm = *a_perm;
441 const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
442 ->perm;
443
444 if (is_delete)
445 perm &= ~b_perm;
446 else
447 perm |= b_perm;
448 *a_perm = perm;
449 return !perm;
450}
451
452/**
453 * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
454 *
455 * @perm: Permission.
456 * @param: Pointer to "struct tomoyo_acl_param".
457 *
458 * Returns 0 on success, negative value otherwise.
459 *
460 * Caller holds tomoyo_read_lock().
461 */
462static int tomoyo_update_mkdev_acl(const u8 perm,
463 struct tomoyo_acl_param *param)
464{
465 struct tomoyo_mkdev_acl e = {
466 .head.type = TOMOYO_TYPE_MKDEV_ACL,
467 .perm = perm
468 };
469 int error;
470
471 if (!tomoyo_parse_name_union(param, &e.name) ||
472 !tomoyo_parse_number_union(param, &e.mode) ||
473 !tomoyo_parse_number_union(param, &e.major) ||
474 !tomoyo_parse_number_union(param, &e.minor))
475 error = -EINVAL;
476 else
477 error = tomoyo_update_domain(&e.head, sizeof(e), param,
478 tomoyo_same_mkdev_acl,
479 tomoyo_merge_mkdev_acl);
480 tomoyo_put_name_union(&e.name);
481 tomoyo_put_number_union(&e.mode);
482 tomoyo_put_number_union(&e.major);
483 tomoyo_put_number_union(&e.minor);
484 return error;
485}
486
487/**
488 * tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
489 *
490 * @a: Pointer to "struct tomoyo_acl_info".
491 * @b: Pointer to "struct tomoyo_acl_info".
492 *
493 * Returns true if @a == @b except permission bits, false otherwise.
494 */
495static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
496 const struct tomoyo_acl_info *b)
497{
498 const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
499 const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
500
501 return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
502 tomoyo_same_name_union(&p1->name2, &p2->name2);
503}
504
505/**
506 * tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
507 *
508 * @a: Pointer to "struct tomoyo_acl_info".
509 * @b: Pointer to "struct tomoyo_acl_info".
510 * @is_delete: True for @a &= ~@b, false for @a |= @b.
511 *
512 * Returns true if @a is empty, false otherwise.
513 */
514static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
515 struct tomoyo_acl_info *b,
516 const bool is_delete)
517{
518 u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
519 ->perm;
520 u8 perm = *a_perm;
521 const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
522
523 if (is_delete)
524 perm &= ~b_perm;
525 else
526 perm |= b_perm;
527 *a_perm = perm;
528 return !perm;
529}
530
531/**
532 * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
533 *
534 * @perm: Permission.
535 * @param: Pointer to "struct tomoyo_acl_param".
536 *
537 * Returns 0 on success, negative value otherwise.
538 *
539 * Caller holds tomoyo_read_lock().
540 */
541static int tomoyo_update_path2_acl(const u8 perm,
542 struct tomoyo_acl_param *param)
543{
544 struct tomoyo_path2_acl e = {
545 .head.type = TOMOYO_TYPE_PATH2_ACL,
546 .perm = perm
547 };
548 int error;
549
550 if (!tomoyo_parse_name_union(param, &e.name1) ||
551 !tomoyo_parse_name_union(param, &e.name2))
552 error = -EINVAL;
553 else
554 error = tomoyo_update_domain(&e.head, sizeof(e), param,
555 tomoyo_same_path2_acl,
556 tomoyo_merge_path2_acl);
557 tomoyo_put_name_union(&e.name1);
558 tomoyo_put_name_union(&e.name2);
559 return error;
560}
561
562/**
563 * tomoyo_path_permission - Check permission for single path operation.
564 *
565 * @r: Pointer to "struct tomoyo_request_info".
566 * @operation: Type of operation.
567 * @filename: Filename to check.
568 *
569 * Returns 0 on success, negative value otherwise.
570 *
571 * Caller holds tomoyo_read_lock().
572 */
573static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
574 const struct tomoyo_path_info *filename)
575{
576 int error;
577
578 r->type = tomoyo_p2mac[operation];
579 r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
580 if (r->mode == TOMOYO_CONFIG_DISABLED)
581 return 0;
582 r->param_type = TOMOYO_TYPE_PATH_ACL;
583 r->param.path.filename = filename;
584 r->param.path.operation = operation;
585 do {
586 tomoyo_check_acl(r, tomoyo_check_path_acl);
587 error = tomoyo_audit_path_log(r);
588 } while (error == TOMOYO_RETRY_REQUEST);
589 return error;
590}
591
592/**
593 * tomoyo_execute_permission - Check permission for execute operation.
594 *
595 * @r: Pointer to "struct tomoyo_request_info".
596 * @filename: Filename to check.
597 *
598 * Returns 0 on success, negative value otherwise.
599 *
600 * Caller holds tomoyo_read_lock().
601 */
602int tomoyo_execute_permission(struct tomoyo_request_info *r,
603 const struct tomoyo_path_info *filename)
604{
605 /*
606 * Unlike other permission checks, this check is done regardless of
607 * profile mode settings in order to check for domain transition
608 * preference.
609 */
610 r->type = TOMOYO_MAC_FILE_EXECUTE;
611 r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
612 r->param_type = TOMOYO_TYPE_PATH_ACL;
613 r->param.path.filename = filename;
614 r->param.path.operation = TOMOYO_TYPE_EXECUTE;
615 tomoyo_check_acl(r, tomoyo_check_path_acl);
616 r->ee->transition = r->matched_acl && r->matched_acl->cond ?
617 r->matched_acl->cond->transit : NULL;
618 if (r->mode != TOMOYO_CONFIG_DISABLED)
619 return tomoyo_audit_path_log(r);
620 return 0;
621}
622
623/**
624 * tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
625 *
626 * @a: Pointer to "struct tomoyo_acl_info".
627 * @b: Pointer to "struct tomoyo_acl_info".
628 *
629 * Returns true if @a == @b except permission bits, false otherwise.
630 */
631static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
632 const struct tomoyo_acl_info *b)
633{
634 const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
635 head);
636 const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
637 head);
638
639 return tomoyo_same_name_union(&p1->name, &p2->name) &&
640 tomoyo_same_number_union(&p1->number, &p2->number);
641}
642
643/**
644 * tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
645 *
646 * @a: Pointer to "struct tomoyo_acl_info".
647 * @b: Pointer to "struct tomoyo_acl_info".
648 * @is_delete: True for @a &= ~@b, false for @a |= @b.
649 *
650 * Returns true if @a is empty, false otherwise.
651 */
652static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
653 struct tomoyo_acl_info *b,
654 const bool is_delete)
655{
656 u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
657 head)->perm;
658 u8 perm = *a_perm;
659 const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
660 ->perm;
661
662 if (is_delete)
663 perm &= ~b_perm;
664 else
665 perm |= b_perm;
666 *a_perm = perm;
667 return !perm;
668}
669
670/**
671 * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
672 *
673 * @perm: Permission.
674 * @param: Pointer to "struct tomoyo_acl_param".
675 *
676 * Returns 0 on success, negative value otherwise.
677 */
678static int tomoyo_update_path_number_acl(const u8 perm,
679 struct tomoyo_acl_param *param)
680{
681 struct tomoyo_path_number_acl e = {
682 .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
683 .perm = perm
684 };
685 int error;
686
687 if (!tomoyo_parse_name_union(param, &e.name) ||
688 !tomoyo_parse_number_union(param, &e.number))
689 error = -EINVAL;
690 else
691 error = tomoyo_update_domain(&e.head, sizeof(e), param,
692 tomoyo_same_path_number_acl,
693 tomoyo_merge_path_number_acl);
694 tomoyo_put_name_union(&e.name);
695 tomoyo_put_number_union(&e.number);
696 return error;
697}
698
699/**
700 * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
701 *
702 * @type: Type of operation.
703 * @path: Pointer to "struct path".
704 * @number: Number.
705 *
706 * Returns 0 on success, negative value otherwise.
707 */
708int tomoyo_path_number_perm(const u8 type, const struct path *path,
709 unsigned long number)
710{
711 struct tomoyo_request_info r;
712 struct tomoyo_obj_info obj = {
713 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
714 };
715 int error = -ENOMEM;
716 struct tomoyo_path_info buf;
717 int idx;
718
719 if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
720 == TOMOYO_CONFIG_DISABLED || !path->dentry)
721 return 0;
722 idx = tomoyo_read_lock();
723 if (!tomoyo_get_realpath(&buf, path))
724 goto out;
725 r.obj = &obj;
726 if (type == TOMOYO_TYPE_MKDIR)
727 tomoyo_add_slash(&buf);
728 r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
729 r.param.path_number.operation = type;
730 r.param.path_number.filename = &buf;
731 r.param.path_number.number = number;
732 do {
733 tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
734 error = tomoyo_audit_path_number_log(&r);
735 } while (error == TOMOYO_RETRY_REQUEST);
736 kfree(buf.name);
737 out:
738 tomoyo_read_unlock(idx);
739 if (r.mode != TOMOYO_CONFIG_ENFORCING)
740 error = 0;
741 return error;
742}
743
744/**
745 * tomoyo_check_open_permission - Check permission for "read" and "write".
746 *
747 * @domain: Pointer to "struct tomoyo_domain_info".
748 * @path: Pointer to "struct path".
749 * @flag: Flags for open().
750 *
751 * Returns 0 on success, negative value otherwise.
752 */
753int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
754 const struct path *path, const int flag)
755{
756 const u8 acc_mode = ACC_MODE(flag);
757 int error = 0;
758 struct tomoyo_path_info buf;
759 struct tomoyo_request_info r;
760 struct tomoyo_obj_info obj = {
761 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
762 };
763 int idx;
764
765 buf.name = NULL;
766 r.mode = TOMOYO_CONFIG_DISABLED;
767 idx = tomoyo_read_lock();
768 if (acc_mode &&
769 tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
770 != TOMOYO_CONFIG_DISABLED) {
771 if (!tomoyo_get_realpath(&buf, path)) {
772 error = -ENOMEM;
773 goto out;
774 }
775 r.obj = &obj;
776 if (acc_mode & MAY_READ)
777 error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
778 &buf);
779 if (!error && (acc_mode & MAY_WRITE))
780 error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
781 TOMOYO_TYPE_APPEND :
782 TOMOYO_TYPE_WRITE,
783 &buf);
784 }
785 out:
786 kfree(buf.name);
787 tomoyo_read_unlock(idx);
788 if (r.mode != TOMOYO_CONFIG_ENFORCING)
789 error = 0;
790 return error;
791}
792
793/**
794 * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
795 *
796 * @operation: Type of operation.
797 * @path: Pointer to "struct path".
798 * @target: Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
799 * NULL otherwise.
800 *
801 * Returns 0 on success, negative value otherwise.
802 */
803int tomoyo_path_perm(const u8 operation, const struct path *path, const char *target)
804{
805 struct tomoyo_request_info r;
806 struct tomoyo_obj_info obj = {
807 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
808 };
809 int error;
810 struct tomoyo_path_info buf;
811 bool is_enforce;
812 struct tomoyo_path_info symlink_target;
813 int idx;
814
815 if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
816 == TOMOYO_CONFIG_DISABLED)
817 return 0;
818 is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
819 error = -ENOMEM;
820 buf.name = NULL;
821 idx = tomoyo_read_lock();
822 if (!tomoyo_get_realpath(&buf, path))
823 goto out;
824 r.obj = &obj;
825 switch (operation) {
826 case TOMOYO_TYPE_RMDIR:
827 case TOMOYO_TYPE_CHROOT:
828 tomoyo_add_slash(&buf);
829 break;
830 case TOMOYO_TYPE_SYMLINK:
831 symlink_target.name = tomoyo_encode(target);
832 if (!symlink_target.name)
833 goto out;
834 tomoyo_fill_path_info(&symlink_target);
835 obj.symlink_target = &symlink_target;
836 break;
837 }
838 error = tomoyo_path_permission(&r, operation, &buf);
839 if (operation == TOMOYO_TYPE_SYMLINK)
840 kfree(symlink_target.name);
841 out:
842 kfree(buf.name);
843 tomoyo_read_unlock(idx);
844 if (!is_enforce)
845 error = 0;
846 return error;
847}
848
849/**
850 * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
851 *
852 * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
853 * @path: Pointer to "struct path".
854 * @mode: Create mode.
855 * @dev: Device number.
856 *
857 * Returns 0 on success, negative value otherwise.
858 */
859int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
860 const unsigned int mode, unsigned int dev)
861{
862 struct tomoyo_request_info r;
863 struct tomoyo_obj_info obj = {
864 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
865 };
866 int error = -ENOMEM;
867 struct tomoyo_path_info buf;
868 int idx;
869
870 if (tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
871 == TOMOYO_CONFIG_DISABLED)
872 return 0;
873 idx = tomoyo_read_lock();
874 error = -ENOMEM;
875 if (tomoyo_get_realpath(&buf, path)) {
876 r.obj = &obj;
877 dev = new_decode_dev(dev);
878 r.param_type = TOMOYO_TYPE_MKDEV_ACL;
879 r.param.mkdev.filename = &buf;
880 r.param.mkdev.operation = operation;
881 r.param.mkdev.mode = mode;
882 r.param.mkdev.major = MAJOR(dev);
883 r.param.mkdev.minor = MINOR(dev);
884 tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
885 error = tomoyo_audit_mkdev_log(&r);
886 kfree(buf.name);
887 }
888 tomoyo_read_unlock(idx);
889 if (r.mode != TOMOYO_CONFIG_ENFORCING)
890 error = 0;
891 return error;
892}
893
894/**
895 * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
896 *
897 * @operation: Type of operation.
898 * @path1: Pointer to "struct path".
899 * @path2: Pointer to "struct path".
900 *
901 * Returns 0 on success, negative value otherwise.
902 */
903int tomoyo_path2_perm(const u8 operation, const struct path *path1,
904 const struct path *path2)
905{
906 int error = -ENOMEM;
907 struct tomoyo_path_info buf1;
908 struct tomoyo_path_info buf2;
909 struct tomoyo_request_info r;
910 struct tomoyo_obj_info obj = {
911 .path1 = { .mnt = path1->mnt, .dentry = path1->dentry },
912 .path2 = { .mnt = path2->mnt, .dentry = path2->dentry }
913 };
914 int idx;
915
916 if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
917 == TOMOYO_CONFIG_DISABLED)
918 return 0;
919 buf1.name = NULL;
920 buf2.name = NULL;
921 idx = tomoyo_read_lock();
922 if (!tomoyo_get_realpath(&buf1, path1) ||
923 !tomoyo_get_realpath(&buf2, path2))
924 goto out;
925 switch (operation) {
926 case TOMOYO_TYPE_RENAME:
927 case TOMOYO_TYPE_LINK:
928 if (!d_is_dir(path1->dentry))
929 break;
930 /* fall through */
931 case TOMOYO_TYPE_PIVOT_ROOT:
932 tomoyo_add_slash(&buf1);
933 tomoyo_add_slash(&buf2);
934 break;
935 }
936 r.obj = &obj;
937 r.param_type = TOMOYO_TYPE_PATH2_ACL;
938 r.param.path2.operation = operation;
939 r.param.path2.filename1 = &buf1;
940 r.param.path2.filename2 = &buf2;
941 do {
942 tomoyo_check_acl(&r, tomoyo_check_path2_acl);
943 error = tomoyo_audit_path2_log(&r);
944 } while (error == TOMOYO_RETRY_REQUEST);
945 out:
946 kfree(buf1.name);
947 kfree(buf2.name);
948 tomoyo_read_unlock(idx);
949 if (r.mode != TOMOYO_CONFIG_ENFORCING)
950 error = 0;
951 return error;
952}
953
954/**
955 * tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
956 *
957 * @a: Pointer to "struct tomoyo_acl_info".
958 * @b: Pointer to "struct tomoyo_acl_info".
959 *
960 * Returns true if @a == @b, false otherwise.
961 */
962static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
963 const struct tomoyo_acl_info *b)
964{
965 const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
966 const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
967
968 return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
969 tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
970 tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
971 tomoyo_same_number_union(&p1->flags, &p2->flags);
972}
973
974/**
975 * tomoyo_update_mount_acl - Write "struct tomoyo_mount_acl" list.
976 *
977 * @param: Pointer to "struct tomoyo_acl_param".
978 *
979 * Returns 0 on success, negative value otherwise.
980 *
981 * Caller holds tomoyo_read_lock().
982 */
983static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param)
984{
985 struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
986 int error;
987
988 if (!tomoyo_parse_name_union(param, &e.dev_name) ||
989 !tomoyo_parse_name_union(param, &e.dir_name) ||
990 !tomoyo_parse_name_union(param, &e.fs_type) ||
991 !tomoyo_parse_number_union(param, &e.flags))
992 error = -EINVAL;
993 else
994 error = tomoyo_update_domain(&e.head, sizeof(e), param,
995 tomoyo_same_mount_acl, NULL);
996 tomoyo_put_name_union(&e.dev_name);
997 tomoyo_put_name_union(&e.dir_name);
998 tomoyo_put_name_union(&e.fs_type);
999 tomoyo_put_number_union(&e.flags);
1000 return error;
1001}
1002
1003/**
1004 * tomoyo_write_file - Update file related list.
1005 *
1006 * @param: Pointer to "struct tomoyo_acl_param".
1007 *
1008 * Returns 0 on success, negative value otherwise.
1009 *
1010 * Caller holds tomoyo_read_lock().
1011 */
1012int tomoyo_write_file(struct tomoyo_acl_param *param)
1013{
1014 u16 perm = 0;
1015 u8 type;
1016 const char *operation = tomoyo_read_token(param);
1017
1018 for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++)
1019 if (tomoyo_permstr(operation, tomoyo_path_keyword[type]))
1020 perm |= 1 << type;
1021 if (perm)
1022 return tomoyo_update_path_acl(perm, param);
1023 for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++)
1024 if (tomoyo_permstr(operation,
1025 tomoyo_mac_keywords[tomoyo_pp2mac[type]]))
1026 perm |= 1 << type;
1027 if (perm)
1028 return tomoyo_update_path2_acl(perm, param);
1029 for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++)
1030 if (tomoyo_permstr(operation,
1031 tomoyo_mac_keywords[tomoyo_pn2mac[type]]))
1032 perm |= 1 << type;
1033 if (perm)
1034 return tomoyo_update_path_number_acl(perm, param);
1035 for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++)
1036 if (tomoyo_permstr(operation,
1037 tomoyo_mac_keywords[tomoyo_pnnn2mac[type]]))
1038 perm |= 1 << type;
1039 if (perm)
1040 return tomoyo_update_mkdev_acl(perm, param);
1041 if (tomoyo_permstr(operation,
1042 tomoyo_mac_keywords[TOMOYO_MAC_FILE_MOUNT]))
1043 return tomoyo_update_mount_acl(param);
1044 return -EINVAL;
1045}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * security/tomoyo/file.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8#include "common.h"
9#include <linux/slab.h>
10
11/*
12 * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
13 */
14static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
15 [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE,
16 [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN,
17 [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN,
18 [TOMOYO_TYPE_APPEND] = TOMOYO_MAC_FILE_OPEN,
19 [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK,
20 [TOMOYO_TYPE_GETATTR] = TOMOYO_MAC_FILE_GETATTR,
21 [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR,
22 [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE,
23 [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK,
24 [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT,
25 [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT,
26};
27
28/*
29 * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
30 */
31const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
32 [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
33 [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR,
34};
35
36/*
37 * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
38 */
39const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
40 [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK,
41 [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME,
42 [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
43};
44
45/*
46 * Mapping table from "enum tomoyo_path_number_acl_index" to
47 * "enum tomoyo_mac_index".
48 */
49const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
50 [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
51 [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR,
52 [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
53 [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
54 [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL,
55 [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD,
56 [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN,
57 [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP,
58};
59
60/**
61 * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
62 *
63 * @ptr: Pointer to "struct tomoyo_name_union".
64 *
65 * Returns nothing.
66 */
67void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
68{
69 tomoyo_put_group(ptr->group);
70 tomoyo_put_name(ptr->filename);
71}
72
73/**
74 * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
75 *
76 * @name: Pointer to "struct tomoyo_path_info".
77 * @ptr: Pointer to "struct tomoyo_name_union".
78 *
79 * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
80 */
81const struct tomoyo_path_info *
82tomoyo_compare_name_union(const struct tomoyo_path_info *name,
83 const struct tomoyo_name_union *ptr)
84{
85 if (ptr->group)
86 return tomoyo_path_matches_group(name, ptr->group);
87 if (tomoyo_path_matches_pattern(name, ptr->filename))
88 return ptr->filename;
89 return NULL;
90}
91
92/**
93 * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
94 *
95 * @ptr: Pointer to "struct tomoyo_number_union".
96 *
97 * Returns nothing.
98 */
99void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
100{
101 tomoyo_put_group(ptr->group);
102}
103
104/**
105 * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
106 *
107 * @value: Number to check.
108 * @ptr: Pointer to "struct tomoyo_number_union".
109 *
110 * Returns true if @value matches @ptr, false otherwise.
111 */
112bool tomoyo_compare_number_union(const unsigned long value,
113 const struct tomoyo_number_union *ptr)
114{
115 if (ptr->group)
116 return tomoyo_number_matches_group(value, value, ptr->group);
117 return value >= ptr->values[0] && value <= ptr->values[1];
118}
119
120/**
121 * tomoyo_add_slash - Add trailing '/' if needed.
122 *
123 * @buf: Pointer to "struct tomoyo_path_info".
124 *
125 * Returns nothing.
126 *
127 * @buf must be generated by tomoyo_encode() because this function does not
128 * allocate memory for adding '/'.
129 */
130static void tomoyo_add_slash(struct tomoyo_path_info *buf)
131{
132 if (buf->is_dir)
133 return;
134 /*
135 * This is OK because tomoyo_encode() reserves space for appending "/".
136 */
137 strcat((char *) buf->name, "/");
138 tomoyo_fill_path_info(buf);
139}
140
141/**
142 * tomoyo_get_realpath - Get realpath.
143 *
144 * @buf: Pointer to "struct tomoyo_path_info".
145 * @path: Pointer to "struct path".
146 *
147 * Returns true on success, false otherwise.
148 */
149static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, const struct path *path)
150{
151 buf->name = tomoyo_realpath_from_path(path);
152 if (buf->name) {
153 tomoyo_fill_path_info(buf);
154 return true;
155 }
156 return false;
157}
158
159/**
160 * tomoyo_audit_path_log - Audit path request log.
161 *
162 * @r: Pointer to "struct tomoyo_request_info".
163 *
164 * Returns 0 on success, negative value otherwise.
165 */
166static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
167{
168 return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword
169 [r->param.path.operation],
170 r->param.path.filename->name);
171}
172
173/**
174 * tomoyo_audit_path2_log - Audit path/path request log.
175 *
176 * @r: Pointer to "struct tomoyo_request_info".
177 *
178 * Returns 0 on success, negative value otherwise.
179 */
180static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
181{
182 return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
183 [tomoyo_pp2mac[r->param.path2.operation]],
184 r->param.path2.filename1->name,
185 r->param.path2.filename2->name);
186}
187
188/**
189 * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
190 *
191 * @r: Pointer to "struct tomoyo_request_info".
192 *
193 * Returns 0 on success, negative value otherwise.
194 */
195static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
196{
197 return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n",
198 tomoyo_mac_keywords
199 [tomoyo_pnnn2mac[r->param.mkdev.operation]],
200 r->param.mkdev.filename->name,
201 r->param.mkdev.mode, r->param.mkdev.major,
202 r->param.mkdev.minor);
203}
204
205/**
206 * tomoyo_audit_path_number_log - Audit path/number request log.
207 *
208 * @r: Pointer to "struct tomoyo_request_info".
209 *
210 * Returns 0 on success, negative value otherwise.
211 */
212static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
213{
214 const u8 type = r->param.path_number.operation;
215 u8 radix;
216 char buffer[64];
217 switch (type) {
218 case TOMOYO_TYPE_CREATE:
219 case TOMOYO_TYPE_MKDIR:
220 case TOMOYO_TYPE_MKFIFO:
221 case TOMOYO_TYPE_MKSOCK:
222 case TOMOYO_TYPE_CHMOD:
223 radix = TOMOYO_VALUE_TYPE_OCTAL;
224 break;
225 case TOMOYO_TYPE_IOCTL:
226 radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
227 break;
228 default:
229 radix = TOMOYO_VALUE_TYPE_DECIMAL;
230 break;
231 }
232 tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
233 radix);
234 return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
235 [tomoyo_pn2mac[type]],
236 r->param.path_number.filename->name, buffer);
237}
238
239/**
240 * tomoyo_check_path_acl - Check permission for path operation.
241 *
242 * @r: Pointer to "struct tomoyo_request_info".
243 * @ptr: Pointer to "struct tomoyo_acl_info".
244 *
245 * Returns true if granted, false otherwise.
246 *
247 * To be able to use wildcard for domain transition, this function sets
248 * matching entry on success. Since the caller holds tomoyo_read_lock(),
249 * it is safe to set matching entry.
250 */
251static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
252 const struct tomoyo_acl_info *ptr)
253{
254 const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
255 head);
256 if (acl->perm & (1 << r->param.path.operation)) {
257 r->param.path.matched_path =
258 tomoyo_compare_name_union(r->param.path.filename,
259 &acl->name);
260 return r->param.path.matched_path != NULL;
261 }
262 return false;
263}
264
265/**
266 * tomoyo_check_path_number_acl - Check permission for path number operation.
267 *
268 * @r: Pointer to "struct tomoyo_request_info".
269 * @ptr: Pointer to "struct tomoyo_acl_info".
270 *
271 * Returns true if granted, false otherwise.
272 */
273static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
274 const struct tomoyo_acl_info *ptr)
275{
276 const struct tomoyo_path_number_acl *acl =
277 container_of(ptr, typeof(*acl), head);
278 return (acl->perm & (1 << r->param.path_number.operation)) &&
279 tomoyo_compare_number_union(r->param.path_number.number,
280 &acl->number) &&
281 tomoyo_compare_name_union(r->param.path_number.filename,
282 &acl->name);
283}
284
285/**
286 * tomoyo_check_path2_acl - Check permission for path path operation.
287 *
288 * @r: Pointer to "struct tomoyo_request_info".
289 * @ptr: Pointer to "struct tomoyo_acl_info".
290 *
291 * Returns true if granted, false otherwise.
292 */
293static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
294 const struct tomoyo_acl_info *ptr)
295{
296 const struct tomoyo_path2_acl *acl =
297 container_of(ptr, typeof(*acl), head);
298 return (acl->perm & (1 << r->param.path2.operation)) &&
299 tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
300 && tomoyo_compare_name_union(r->param.path2.filename2,
301 &acl->name2);
302}
303
304/**
305 * tomoyo_check_mkdev_acl - Check permission for path number number number operation.
306 *
307 * @r: Pointer to "struct tomoyo_request_info".
308 * @ptr: Pointer to "struct tomoyo_acl_info".
309 *
310 * Returns true if granted, false otherwise.
311 */
312static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
313 const struct tomoyo_acl_info *ptr)
314{
315 const struct tomoyo_mkdev_acl *acl =
316 container_of(ptr, typeof(*acl), head);
317 return (acl->perm & (1 << r->param.mkdev.operation)) &&
318 tomoyo_compare_number_union(r->param.mkdev.mode,
319 &acl->mode) &&
320 tomoyo_compare_number_union(r->param.mkdev.major,
321 &acl->major) &&
322 tomoyo_compare_number_union(r->param.mkdev.minor,
323 &acl->minor) &&
324 tomoyo_compare_name_union(r->param.mkdev.filename,
325 &acl->name);
326}
327
328/**
329 * tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
330 *
331 * @a: Pointer to "struct tomoyo_acl_info".
332 * @b: Pointer to "struct tomoyo_acl_info".
333 *
334 * Returns true if @a == @b except permission bits, false otherwise.
335 */
336static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
337 const struct tomoyo_acl_info *b)
338{
339 const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
340 const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
341 return tomoyo_same_name_union(&p1->name, &p2->name);
342}
343
344/**
345 * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
346 *
347 * @a: Pointer to "struct tomoyo_acl_info".
348 * @b: Pointer to "struct tomoyo_acl_info".
349 * @is_delete: True for @a &= ~@b, false for @a |= @b.
350 *
351 * Returns true if @a is empty, false otherwise.
352 */
353static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
354 struct tomoyo_acl_info *b,
355 const bool is_delete)
356{
357 u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
358 ->perm;
359 u16 perm = *a_perm;
360 const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
361 if (is_delete)
362 perm &= ~b_perm;
363 else
364 perm |= b_perm;
365 *a_perm = perm;
366 return !perm;
367}
368
369/**
370 * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
371 *
372 * @perm: Permission.
373 * @param: Pointer to "struct tomoyo_acl_param".
374 *
375 * Returns 0 on success, negative value otherwise.
376 *
377 * Caller holds tomoyo_read_lock().
378 */
379static int tomoyo_update_path_acl(const u16 perm,
380 struct tomoyo_acl_param *param)
381{
382 struct tomoyo_path_acl e = {
383 .head.type = TOMOYO_TYPE_PATH_ACL,
384 .perm = perm
385 };
386 int error;
387 if (!tomoyo_parse_name_union(param, &e.name))
388 error = -EINVAL;
389 else
390 error = tomoyo_update_domain(&e.head, sizeof(e), param,
391 tomoyo_same_path_acl,
392 tomoyo_merge_path_acl);
393 tomoyo_put_name_union(&e.name);
394 return error;
395}
396
397/**
398 * tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
399 *
400 * @a: Pointer to "struct tomoyo_acl_info".
401 * @b: Pointer to "struct tomoyo_acl_info".
402 *
403 * Returns true if @a == @b except permission bits, false otherwise.
404 */
405static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
406 const struct tomoyo_acl_info *b)
407{
408 const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
409 const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
410 return tomoyo_same_name_union(&p1->name, &p2->name) &&
411 tomoyo_same_number_union(&p1->mode, &p2->mode) &&
412 tomoyo_same_number_union(&p1->major, &p2->major) &&
413 tomoyo_same_number_union(&p1->minor, &p2->minor);
414}
415
416/**
417 * tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
418 *
419 * @a: Pointer to "struct tomoyo_acl_info".
420 * @b: Pointer to "struct tomoyo_acl_info".
421 * @is_delete: True for @a &= ~@b, false for @a |= @b.
422 *
423 * Returns true if @a is empty, false otherwise.
424 */
425static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
426 struct tomoyo_acl_info *b,
427 const bool is_delete)
428{
429 u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
430 head)->perm;
431 u8 perm = *a_perm;
432 const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
433 ->perm;
434 if (is_delete)
435 perm &= ~b_perm;
436 else
437 perm |= b_perm;
438 *a_perm = perm;
439 return !perm;
440}
441
442/**
443 * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
444 *
445 * @perm: Permission.
446 * @param: Pointer to "struct tomoyo_acl_param".
447 *
448 * Returns 0 on success, negative value otherwise.
449 *
450 * Caller holds tomoyo_read_lock().
451 */
452static int tomoyo_update_mkdev_acl(const u8 perm,
453 struct tomoyo_acl_param *param)
454{
455 struct tomoyo_mkdev_acl e = {
456 .head.type = TOMOYO_TYPE_MKDEV_ACL,
457 .perm = perm
458 };
459 int error;
460 if (!tomoyo_parse_name_union(param, &e.name) ||
461 !tomoyo_parse_number_union(param, &e.mode) ||
462 !tomoyo_parse_number_union(param, &e.major) ||
463 !tomoyo_parse_number_union(param, &e.minor))
464 error = -EINVAL;
465 else
466 error = tomoyo_update_domain(&e.head, sizeof(e), param,
467 tomoyo_same_mkdev_acl,
468 tomoyo_merge_mkdev_acl);
469 tomoyo_put_name_union(&e.name);
470 tomoyo_put_number_union(&e.mode);
471 tomoyo_put_number_union(&e.major);
472 tomoyo_put_number_union(&e.minor);
473 return error;
474}
475
476/**
477 * tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
478 *
479 * @a: Pointer to "struct tomoyo_acl_info".
480 * @b: Pointer to "struct tomoyo_acl_info".
481 *
482 * Returns true if @a == @b except permission bits, false otherwise.
483 */
484static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
485 const struct tomoyo_acl_info *b)
486{
487 const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
488 const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
489 return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
490 tomoyo_same_name_union(&p1->name2, &p2->name2);
491}
492
493/**
494 * tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
495 *
496 * @a: Pointer to "struct tomoyo_acl_info".
497 * @b: Pointer to "struct tomoyo_acl_info".
498 * @is_delete: True for @a &= ~@b, false for @a |= @b.
499 *
500 * Returns true if @a is empty, false otherwise.
501 */
502static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
503 struct tomoyo_acl_info *b,
504 const bool is_delete)
505{
506 u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
507 ->perm;
508 u8 perm = *a_perm;
509 const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
510 if (is_delete)
511 perm &= ~b_perm;
512 else
513 perm |= b_perm;
514 *a_perm = perm;
515 return !perm;
516}
517
518/**
519 * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
520 *
521 * @perm: Permission.
522 * @param: Pointer to "struct tomoyo_acl_param".
523 *
524 * Returns 0 on success, negative value otherwise.
525 *
526 * Caller holds tomoyo_read_lock().
527 */
528static int tomoyo_update_path2_acl(const u8 perm,
529 struct tomoyo_acl_param *param)
530{
531 struct tomoyo_path2_acl e = {
532 .head.type = TOMOYO_TYPE_PATH2_ACL,
533 .perm = perm
534 };
535 int error;
536 if (!tomoyo_parse_name_union(param, &e.name1) ||
537 !tomoyo_parse_name_union(param, &e.name2))
538 error = -EINVAL;
539 else
540 error = tomoyo_update_domain(&e.head, sizeof(e), param,
541 tomoyo_same_path2_acl,
542 tomoyo_merge_path2_acl);
543 tomoyo_put_name_union(&e.name1);
544 tomoyo_put_name_union(&e.name2);
545 return error;
546}
547
548/**
549 * tomoyo_path_permission - Check permission for single path operation.
550 *
551 * @r: Pointer to "struct tomoyo_request_info".
552 * @operation: Type of operation.
553 * @filename: Filename to check.
554 *
555 * Returns 0 on success, negative value otherwise.
556 *
557 * Caller holds tomoyo_read_lock().
558 */
559static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
560 const struct tomoyo_path_info *filename)
561{
562 int error;
563
564 r->type = tomoyo_p2mac[operation];
565 r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
566 if (r->mode == TOMOYO_CONFIG_DISABLED)
567 return 0;
568 r->param_type = TOMOYO_TYPE_PATH_ACL;
569 r->param.path.filename = filename;
570 r->param.path.operation = operation;
571 do {
572 tomoyo_check_acl(r, tomoyo_check_path_acl);
573 error = tomoyo_audit_path_log(r);
574 } while (error == TOMOYO_RETRY_REQUEST);
575 return error;
576}
577
578/**
579 * tomoyo_execute_permission - Check permission for execute operation.
580 *
581 * @r: Pointer to "struct tomoyo_request_info".
582 * @filename: Filename to check.
583 *
584 * Returns 0 on success, negative value otherwise.
585 *
586 * Caller holds tomoyo_read_lock().
587 */
588int tomoyo_execute_permission(struct tomoyo_request_info *r,
589 const struct tomoyo_path_info *filename)
590{
591 /*
592 * Unlike other permission checks, this check is done regardless of
593 * profile mode settings in order to check for domain transition
594 * preference.
595 */
596 r->type = TOMOYO_MAC_FILE_EXECUTE;
597 r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
598 r->param_type = TOMOYO_TYPE_PATH_ACL;
599 r->param.path.filename = filename;
600 r->param.path.operation = TOMOYO_TYPE_EXECUTE;
601 tomoyo_check_acl(r, tomoyo_check_path_acl);
602 r->ee->transition = r->matched_acl && r->matched_acl->cond ?
603 r->matched_acl->cond->transit : NULL;
604 if (r->mode != TOMOYO_CONFIG_DISABLED)
605 return tomoyo_audit_path_log(r);
606 return 0;
607}
608
609/**
610 * tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
611 *
612 * @a: Pointer to "struct tomoyo_acl_info".
613 * @b: Pointer to "struct tomoyo_acl_info".
614 *
615 * Returns true if @a == @b except permission bits, false otherwise.
616 */
617static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
618 const struct tomoyo_acl_info *b)
619{
620 const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
621 head);
622 const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
623 head);
624 return tomoyo_same_name_union(&p1->name, &p2->name) &&
625 tomoyo_same_number_union(&p1->number, &p2->number);
626}
627
628/**
629 * tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
630 *
631 * @a: Pointer to "struct tomoyo_acl_info".
632 * @b: Pointer to "struct tomoyo_acl_info".
633 * @is_delete: True for @a &= ~@b, false for @a |= @b.
634 *
635 * Returns true if @a is empty, false otherwise.
636 */
637static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
638 struct tomoyo_acl_info *b,
639 const bool is_delete)
640{
641 u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
642 head)->perm;
643 u8 perm = *a_perm;
644 const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
645 ->perm;
646 if (is_delete)
647 perm &= ~b_perm;
648 else
649 perm |= b_perm;
650 *a_perm = perm;
651 return !perm;
652}
653
654/**
655 * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
656 *
657 * @perm: Permission.
658 * @param: Pointer to "struct tomoyo_acl_param".
659 *
660 * Returns 0 on success, negative value otherwise.
661 */
662static int tomoyo_update_path_number_acl(const u8 perm,
663 struct tomoyo_acl_param *param)
664{
665 struct tomoyo_path_number_acl e = {
666 .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
667 .perm = perm
668 };
669 int error;
670 if (!tomoyo_parse_name_union(param, &e.name) ||
671 !tomoyo_parse_number_union(param, &e.number))
672 error = -EINVAL;
673 else
674 error = tomoyo_update_domain(&e.head, sizeof(e), param,
675 tomoyo_same_path_number_acl,
676 tomoyo_merge_path_number_acl);
677 tomoyo_put_name_union(&e.name);
678 tomoyo_put_number_union(&e.number);
679 return error;
680}
681
682/**
683 * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
684 *
685 * @type: Type of operation.
686 * @path: Pointer to "struct path".
687 * @number: Number.
688 *
689 * Returns 0 on success, negative value otherwise.
690 */
691int tomoyo_path_number_perm(const u8 type, const struct path *path,
692 unsigned long number)
693{
694 struct tomoyo_request_info r;
695 struct tomoyo_obj_info obj = {
696 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
697 };
698 int error = -ENOMEM;
699 struct tomoyo_path_info buf;
700 int idx;
701
702 if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
703 == TOMOYO_CONFIG_DISABLED || !path->dentry)
704 return 0;
705 idx = tomoyo_read_lock();
706 if (!tomoyo_get_realpath(&buf, path))
707 goto out;
708 r.obj = &obj;
709 if (type == TOMOYO_TYPE_MKDIR)
710 tomoyo_add_slash(&buf);
711 r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
712 r.param.path_number.operation = type;
713 r.param.path_number.filename = &buf;
714 r.param.path_number.number = number;
715 do {
716 tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
717 error = tomoyo_audit_path_number_log(&r);
718 } while (error == TOMOYO_RETRY_REQUEST);
719 kfree(buf.name);
720 out:
721 tomoyo_read_unlock(idx);
722 if (r.mode != TOMOYO_CONFIG_ENFORCING)
723 error = 0;
724 return error;
725}
726
727/**
728 * tomoyo_check_open_permission - Check permission for "read" and "write".
729 *
730 * @domain: Pointer to "struct tomoyo_domain_info".
731 * @path: Pointer to "struct path".
732 * @flag: Flags for open().
733 *
734 * Returns 0 on success, negative value otherwise.
735 */
736int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
737 const struct path *path, const int flag)
738{
739 const u8 acc_mode = ACC_MODE(flag);
740 int error = 0;
741 struct tomoyo_path_info buf;
742 struct tomoyo_request_info r;
743 struct tomoyo_obj_info obj = {
744 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
745 };
746 int idx;
747
748 buf.name = NULL;
749 r.mode = TOMOYO_CONFIG_DISABLED;
750 idx = tomoyo_read_lock();
751 if (acc_mode &&
752 tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
753 != TOMOYO_CONFIG_DISABLED) {
754 if (!tomoyo_get_realpath(&buf, path)) {
755 error = -ENOMEM;
756 goto out;
757 }
758 r.obj = &obj;
759 if (acc_mode & MAY_READ)
760 error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
761 &buf);
762 if (!error && (acc_mode & MAY_WRITE))
763 error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
764 TOMOYO_TYPE_APPEND :
765 TOMOYO_TYPE_WRITE,
766 &buf);
767 }
768 out:
769 kfree(buf.name);
770 tomoyo_read_unlock(idx);
771 if (r.mode != TOMOYO_CONFIG_ENFORCING)
772 error = 0;
773 return error;
774}
775
776/**
777 * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
778 *
779 * @operation: Type of operation.
780 * @path: Pointer to "struct path".
781 * @target: Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
782 * NULL otherwise.
783 *
784 * Returns 0 on success, negative value otherwise.
785 */
786int tomoyo_path_perm(const u8 operation, const struct path *path, const char *target)
787{
788 struct tomoyo_request_info r;
789 struct tomoyo_obj_info obj = {
790 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
791 };
792 int error;
793 struct tomoyo_path_info buf;
794 bool is_enforce;
795 struct tomoyo_path_info symlink_target;
796 int idx;
797
798 if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
799 == TOMOYO_CONFIG_DISABLED)
800 return 0;
801 is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
802 error = -ENOMEM;
803 buf.name = NULL;
804 idx = tomoyo_read_lock();
805 if (!tomoyo_get_realpath(&buf, path))
806 goto out;
807 r.obj = &obj;
808 switch (operation) {
809 case TOMOYO_TYPE_RMDIR:
810 case TOMOYO_TYPE_CHROOT:
811 tomoyo_add_slash(&buf);
812 break;
813 case TOMOYO_TYPE_SYMLINK:
814 symlink_target.name = tomoyo_encode(target);
815 if (!symlink_target.name)
816 goto out;
817 tomoyo_fill_path_info(&symlink_target);
818 obj.symlink_target = &symlink_target;
819 break;
820 }
821 error = tomoyo_path_permission(&r, operation, &buf);
822 if (operation == TOMOYO_TYPE_SYMLINK)
823 kfree(symlink_target.name);
824 out:
825 kfree(buf.name);
826 tomoyo_read_unlock(idx);
827 if (!is_enforce)
828 error = 0;
829 return error;
830}
831
832/**
833 * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
834 *
835 * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
836 * @path: Pointer to "struct path".
837 * @mode: Create mode.
838 * @dev: Device number.
839 *
840 * Returns 0 on success, negative value otherwise.
841 */
842int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
843 const unsigned int mode, unsigned int dev)
844{
845 struct tomoyo_request_info r;
846 struct tomoyo_obj_info obj = {
847 .path1 = { .mnt = path->mnt, .dentry = path->dentry },
848 };
849 int error = -ENOMEM;
850 struct tomoyo_path_info buf;
851 int idx;
852
853 if (tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
854 == TOMOYO_CONFIG_DISABLED)
855 return 0;
856 idx = tomoyo_read_lock();
857 error = -ENOMEM;
858 if (tomoyo_get_realpath(&buf, path)) {
859 r.obj = &obj;
860 dev = new_decode_dev(dev);
861 r.param_type = TOMOYO_TYPE_MKDEV_ACL;
862 r.param.mkdev.filename = &buf;
863 r.param.mkdev.operation = operation;
864 r.param.mkdev.mode = mode;
865 r.param.mkdev.major = MAJOR(dev);
866 r.param.mkdev.minor = MINOR(dev);
867 tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
868 error = tomoyo_audit_mkdev_log(&r);
869 kfree(buf.name);
870 }
871 tomoyo_read_unlock(idx);
872 if (r.mode != TOMOYO_CONFIG_ENFORCING)
873 error = 0;
874 return error;
875}
876
877/**
878 * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
879 *
880 * @operation: Type of operation.
881 * @path1: Pointer to "struct path".
882 * @path2: Pointer to "struct path".
883 *
884 * Returns 0 on success, negative value otherwise.
885 */
886int tomoyo_path2_perm(const u8 operation, const struct path *path1,
887 const struct path *path2)
888{
889 int error = -ENOMEM;
890 struct tomoyo_path_info buf1;
891 struct tomoyo_path_info buf2;
892 struct tomoyo_request_info r;
893 struct tomoyo_obj_info obj = {
894 .path1 = { .mnt = path1->mnt, .dentry = path1->dentry },
895 .path2 = { .mnt = path2->mnt, .dentry = path2->dentry }
896 };
897 int idx;
898
899 if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
900 == TOMOYO_CONFIG_DISABLED)
901 return 0;
902 buf1.name = NULL;
903 buf2.name = NULL;
904 idx = tomoyo_read_lock();
905 if (!tomoyo_get_realpath(&buf1, path1) ||
906 !tomoyo_get_realpath(&buf2, path2))
907 goto out;
908 switch (operation) {
909 case TOMOYO_TYPE_RENAME:
910 case TOMOYO_TYPE_LINK:
911 if (!d_is_dir(path1->dentry))
912 break;
913 /* fall through */
914 case TOMOYO_TYPE_PIVOT_ROOT:
915 tomoyo_add_slash(&buf1);
916 tomoyo_add_slash(&buf2);
917 break;
918 }
919 r.obj = &obj;
920 r.param_type = TOMOYO_TYPE_PATH2_ACL;
921 r.param.path2.operation = operation;
922 r.param.path2.filename1 = &buf1;
923 r.param.path2.filename2 = &buf2;
924 do {
925 tomoyo_check_acl(&r, tomoyo_check_path2_acl);
926 error = tomoyo_audit_path2_log(&r);
927 } while (error == TOMOYO_RETRY_REQUEST);
928 out:
929 kfree(buf1.name);
930 kfree(buf2.name);
931 tomoyo_read_unlock(idx);
932 if (r.mode != TOMOYO_CONFIG_ENFORCING)
933 error = 0;
934 return error;
935}
936
937/**
938 * tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
939 *
940 * @a: Pointer to "struct tomoyo_acl_info".
941 * @b: Pointer to "struct tomoyo_acl_info".
942 *
943 * Returns true if @a == @b, false otherwise.
944 */
945static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
946 const struct tomoyo_acl_info *b)
947{
948 const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
949 const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
950 return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
951 tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
952 tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
953 tomoyo_same_number_union(&p1->flags, &p2->flags);
954}
955
956/**
957 * tomoyo_update_mount_acl - Write "struct tomoyo_mount_acl" list.
958 *
959 * @param: Pointer to "struct tomoyo_acl_param".
960 *
961 * Returns 0 on success, negative value otherwise.
962 *
963 * Caller holds tomoyo_read_lock().
964 */
965static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param)
966{
967 struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
968 int error;
969 if (!tomoyo_parse_name_union(param, &e.dev_name) ||
970 !tomoyo_parse_name_union(param, &e.dir_name) ||
971 !tomoyo_parse_name_union(param, &e.fs_type) ||
972 !tomoyo_parse_number_union(param, &e.flags))
973 error = -EINVAL;
974 else
975 error = tomoyo_update_domain(&e.head, sizeof(e), param,
976 tomoyo_same_mount_acl, NULL);
977 tomoyo_put_name_union(&e.dev_name);
978 tomoyo_put_name_union(&e.dir_name);
979 tomoyo_put_name_union(&e.fs_type);
980 tomoyo_put_number_union(&e.flags);
981 return error;
982}
983
984/**
985 * tomoyo_write_file - Update file related list.
986 *
987 * @param: Pointer to "struct tomoyo_acl_param".
988 *
989 * Returns 0 on success, negative value otherwise.
990 *
991 * Caller holds tomoyo_read_lock().
992 */
993int tomoyo_write_file(struct tomoyo_acl_param *param)
994{
995 u16 perm = 0;
996 u8 type;
997 const char *operation = tomoyo_read_token(param);
998 for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++)
999 if (tomoyo_permstr(operation, tomoyo_path_keyword[type]))
1000 perm |= 1 << type;
1001 if (perm)
1002 return tomoyo_update_path_acl(perm, param);
1003 for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++)
1004 if (tomoyo_permstr(operation,
1005 tomoyo_mac_keywords[tomoyo_pp2mac[type]]))
1006 perm |= 1 << type;
1007 if (perm)
1008 return tomoyo_update_path2_acl(perm, param);
1009 for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++)
1010 if (tomoyo_permstr(operation,
1011 tomoyo_mac_keywords[tomoyo_pn2mac[type]]))
1012 perm |= 1 << type;
1013 if (perm)
1014 return tomoyo_update_path_number_acl(perm, param);
1015 for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++)
1016 if (tomoyo_permstr(operation,
1017 tomoyo_mac_keywords[tomoyo_pnnn2mac[type]]))
1018 perm |= 1 << type;
1019 if (perm)
1020 return tomoyo_update_mkdev_acl(perm, param);
1021 if (tomoyo_permstr(operation,
1022 tomoyo_mac_keywords[TOMOYO_MAC_FILE_MOUNT]))
1023 return tomoyo_update_mount_acl(param);
1024 return -EINVAL;
1025}