2 * security/tomoyo/file.c
4 * Pathname restriction functions.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
10 #include <linux/slab.h>
12 /* Keyword array for operations with one pathname. */
13 const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
14 [TOMOYO_TYPE_READ_WRITE] = "read/write",
15 [TOMOYO_TYPE_EXECUTE] = "execute",
16 [TOMOYO_TYPE_READ] = "read",
17 [TOMOYO_TYPE_WRITE] = "write",
18 [TOMOYO_TYPE_UNLINK] = "unlink",
19 [TOMOYO_TYPE_RMDIR] = "rmdir",
20 [TOMOYO_TYPE_TRUNCATE] = "truncate",
21 [TOMOYO_TYPE_SYMLINK] = "symlink",
22 [TOMOYO_TYPE_REWRITE] = "rewrite",
23 [TOMOYO_TYPE_CHROOT] = "chroot",
24 [TOMOYO_TYPE_UMOUNT] = "unmount",
27 /* Keyword array for operations with one pathname and three numbers. */
28 const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = {
29 [TOMOYO_TYPE_MKBLOCK] = "mkblock",
30 [TOMOYO_TYPE_MKCHAR] = "mkchar",
33 /* Keyword array for operations with two pathnames. */
34 const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = {
35 [TOMOYO_TYPE_LINK] = "link",
36 [TOMOYO_TYPE_RENAME] = "rename",
37 [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root",
40 /* Keyword array for operations with one pathname and one number. */
41 const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
42 [TOMOYO_TYPE_CREATE] = "create",
43 [TOMOYO_TYPE_MKDIR] = "mkdir",
44 [TOMOYO_TYPE_MKFIFO] = "mkfifo",
45 [TOMOYO_TYPE_MKSOCK] = "mksock",
46 [TOMOYO_TYPE_IOCTL] = "ioctl",
47 [TOMOYO_TYPE_CHMOD] = "chmod",
48 [TOMOYO_TYPE_CHOWN] = "chown",
49 [TOMOYO_TYPE_CHGRP] = "chgrp",
52 static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
53 [TOMOYO_TYPE_READ_WRITE] = TOMOYO_MAC_FILE_OPEN,
54 [TOMOYO_TYPE_EXECUTE] = TOMOYO_MAC_FILE_EXECUTE,
55 [TOMOYO_TYPE_READ] = TOMOYO_MAC_FILE_OPEN,
56 [TOMOYO_TYPE_WRITE] = TOMOYO_MAC_FILE_OPEN,
57 [TOMOYO_TYPE_UNLINK] = TOMOYO_MAC_FILE_UNLINK,
58 [TOMOYO_TYPE_RMDIR] = TOMOYO_MAC_FILE_RMDIR,
59 [TOMOYO_TYPE_TRUNCATE] = TOMOYO_MAC_FILE_TRUNCATE,
60 [TOMOYO_TYPE_SYMLINK] = TOMOYO_MAC_FILE_SYMLINK,
61 [TOMOYO_TYPE_REWRITE] = TOMOYO_MAC_FILE_REWRITE,
62 [TOMOYO_TYPE_CHROOT] = TOMOYO_MAC_FILE_CHROOT,
63 [TOMOYO_TYPE_UMOUNT] = TOMOYO_MAC_FILE_UMOUNT,
66 static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
67 [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
68 [TOMOYO_TYPE_MKCHAR] = TOMOYO_MAC_FILE_MKCHAR,
71 static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
72 [TOMOYO_TYPE_LINK] = TOMOYO_MAC_FILE_LINK,
73 [TOMOYO_TYPE_RENAME] = TOMOYO_MAC_FILE_RENAME,
74 [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
77 static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
78 [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
79 [TOMOYO_TYPE_MKDIR] = TOMOYO_MAC_FILE_MKDIR,
80 [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
81 [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
82 [TOMOYO_TYPE_IOCTL] = TOMOYO_MAC_FILE_IOCTL,
83 [TOMOYO_TYPE_CHMOD] = TOMOYO_MAC_FILE_CHMOD,
84 [TOMOYO_TYPE_CHOWN] = TOMOYO_MAC_FILE_CHOWN,
85 [TOMOYO_TYPE_CHGRP] = TOMOYO_MAC_FILE_CHGRP,
88 void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
93 tomoyo_put_group(ptr->group);
95 tomoyo_put_name(ptr->filename);
98 bool tomoyo_compare_name_union(const struct tomoyo_path_info *name,
99 const struct tomoyo_name_union *ptr)
102 return tomoyo_path_matches_group(name, ptr->group);
103 return tomoyo_path_matches_pattern(name, ptr->filename);
106 void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
108 if (ptr && ptr->is_group)
109 tomoyo_put_group(ptr->group);
112 bool tomoyo_compare_number_union(const unsigned long value,
113 const struct tomoyo_number_union *ptr)
116 return tomoyo_number_matches_group(value, value, ptr->group);
117 return value >= ptr->values[0] && value <= ptr->values[1];
120 static void tomoyo_add_slash(struct tomoyo_path_info *buf)
125 * This is OK because tomoyo_encode() reserves space for appending "/".
127 strcat((char *) buf->name, "/");
128 tomoyo_fill_path_info(buf);
132 * tomoyo_strendswith - Check whether the token ends with the given token.
134 * @name: The token to check.
135 * @tail: The token to find.
137 * Returns true if @name ends with @tail, false otherwise.
139 static bool tomoyo_strendswith(const char *name, const char *tail)
145 len = strlen(name) - strlen(tail);
146 return len >= 0 && !strcmp(name + len, tail);
150 * tomoyo_get_realpath - Get realpath.
152 * @buf: Pointer to "struct tomoyo_path_info".
153 * @path: Pointer to "struct path".
155 * Returns true on success, false otherwise.
157 static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path)
159 buf->name = tomoyo_realpath_from_path(path);
161 tomoyo_fill_path_info(buf);
168 * tomoyo_audit_path_log - Audit path request log.
170 * @r: Pointer to "struct tomoyo_request_info".
172 * Returns 0 on success, negative value otherwise.
174 static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
176 const char *operation = tomoyo_path_keyword[r->param.path.operation];
177 const struct tomoyo_path_info *filename = r->param.path.filename;
180 tomoyo_warn_log(r, "%s %s", operation, filename->name);
181 return tomoyo_supervisor(r, "allow_%s %s\n", operation,
182 tomoyo_file_pattern(filename));
186 * tomoyo_audit_path2_log - Audit path/path request log.
188 * @r: Pointer to "struct tomoyo_request_info".
190 * Returns 0 on success, negative value otherwise.
192 static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
194 const char *operation = tomoyo_path2_keyword[r->param.path2.operation];
195 const struct tomoyo_path_info *filename1 = r->param.path2.filename1;
196 const struct tomoyo_path_info *filename2 = r->param.path2.filename2;
199 tomoyo_warn_log(r, "%s %s %s", operation, filename1->name,
201 return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
202 tomoyo_file_pattern(filename1),
203 tomoyo_file_pattern(filename2));
207 * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
209 * @r: Pointer to "struct tomoyo_request_info".
211 * Returns 0 on success, negative value otherwise.
213 static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
215 const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation];
216 const struct tomoyo_path_info *filename = r->param.mkdev.filename;
217 const unsigned int major = r->param.mkdev.major;
218 const unsigned int minor = r->param.mkdev.minor;
219 const unsigned int mode = r->param.mkdev.mode;
222 tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode,
224 return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation,
225 tomoyo_file_pattern(filename), mode, major,
230 * tomoyo_audit_path_number_log - Audit path/number request log.
232 * @r: Pointer to "struct tomoyo_request_info".
233 * @error: Error code.
235 * Returns 0 on success, negative value otherwise.
237 static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
239 const u8 type = r->param.path_number.operation;
241 const struct tomoyo_path_info *filename = r->param.path_number.filename;
242 const char *operation = tomoyo_path_number_keyword[type];
247 case TOMOYO_TYPE_CREATE:
248 case TOMOYO_TYPE_MKDIR:
249 case TOMOYO_TYPE_MKFIFO:
250 case TOMOYO_TYPE_MKSOCK:
251 case TOMOYO_TYPE_CHMOD:
252 radix = TOMOYO_VALUE_TYPE_OCTAL;
254 case TOMOYO_TYPE_IOCTL:
255 radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
258 radix = TOMOYO_VALUE_TYPE_DECIMAL;
261 tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
263 tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer);
264 return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
265 tomoyo_file_pattern(filename), buffer);
268 static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a,
269 const struct tomoyo_acl_head *b)
271 return container_of(a, struct tomoyo_globally_readable_file_entry,
273 container_of(b, struct tomoyo_globally_readable_file_entry,
278 * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list.
280 * @filename: Filename unconditionally permitted to open() for reading.
281 * @is_delete: True if it is a delete request.
283 * Returns 0 on success, negative value otherwise.
285 * Caller holds tomoyo_read_lock().
287 static int tomoyo_update_globally_readable_entry(const char *filename,
288 const bool is_delete)
290 struct tomoyo_globally_readable_file_entry e = { };
293 if (!tomoyo_correct_word(filename))
295 e.filename = tomoyo_get_name(filename);
298 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
300 [TOMOYO_ID_GLOBALLY_READABLE],
301 tomoyo_same_globally_readable);
302 tomoyo_put_name(e.filename);
307 * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading.
309 * @filename: The filename to check.
311 * Returns true if any domain can open @filename for reading, false otherwise.
313 * Caller holds tomoyo_read_lock().
315 static bool tomoyo_globally_readable_file(const struct tomoyo_path_info *
318 struct tomoyo_globally_readable_file_entry *ptr;
321 list_for_each_entry_rcu(ptr, &tomoyo_policy_list
322 [TOMOYO_ID_GLOBALLY_READABLE], head.list) {
323 if (!ptr->head.is_deleted &&
324 tomoyo_path_matches_pattern(filename, ptr->filename)) {
333 * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list.
335 * @data: String to parse.
336 * @is_delete: True if it is a delete request.
338 * Returns 0 on success, negative value otherwise.
340 * Caller holds tomoyo_read_lock().
342 int tomoyo_write_globally_readable_policy(char *data, const bool is_delete)
344 return tomoyo_update_globally_readable_entry(data, is_delete);
347 static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a,
348 const struct tomoyo_acl_head *b)
350 return container_of(a, struct tomoyo_pattern_entry, head)->pattern ==
351 container_of(b, struct tomoyo_pattern_entry, head)->pattern;
355 * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list.
357 * @pattern: Pathname pattern.
358 * @is_delete: True if it is a delete request.
360 * Returns 0 on success, negative value otherwise.
362 * Caller holds tomoyo_read_lock().
364 static int tomoyo_update_file_pattern_entry(const char *pattern,
365 const bool is_delete)
367 struct tomoyo_pattern_entry e = { };
370 if (!tomoyo_correct_word(pattern))
372 e.pattern = tomoyo_get_name(pattern);
375 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
376 &tomoyo_policy_list[TOMOYO_ID_PATTERN],
377 tomoyo_same_pattern);
378 tomoyo_put_name(e.pattern);
383 * tomoyo_file_pattern - Get patterned pathname.
385 * @filename: The filename to find patterned pathname.
387 * Returns pointer to pathname pattern if matched, @filename otherwise.
389 * Caller holds tomoyo_read_lock().
391 const char *tomoyo_file_pattern(const struct tomoyo_path_info *filename)
393 struct tomoyo_pattern_entry *ptr;
394 const struct tomoyo_path_info *pattern = NULL;
396 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN],
398 if (ptr->head.is_deleted)
400 if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
402 pattern = ptr->pattern;
403 if (tomoyo_strendswith(pattern->name, "/\\*")) {
404 /* Do nothing. Try to find the better match. */
406 /* This would be the better match. Use this. */
412 return filename->name;
416 * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list.
418 * @data: String to parse.
419 * @is_delete: True if it is a delete request.
421 * Returns 0 on success, negative value otherwise.
423 * Caller holds tomoyo_read_lock().
425 int tomoyo_write_pattern_policy(char *data, const bool is_delete)
427 return tomoyo_update_file_pattern_entry(data, is_delete);
430 static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a,
431 const struct tomoyo_acl_head *b)
433 return container_of(a, struct tomoyo_no_rewrite_entry, head)->pattern
434 == container_of(b, struct tomoyo_no_rewrite_entry, head)
439 * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list.
441 * @pattern: Pathname pattern that are not rewritable by default.
442 * @is_delete: True if it is a delete request.
444 * Returns 0 on success, negative value otherwise.
446 * Caller holds tomoyo_read_lock().
448 static int tomoyo_update_no_rewrite_entry(const char *pattern,
449 const bool is_delete)
451 struct tomoyo_no_rewrite_entry e = { };
454 if (!tomoyo_correct_word(pattern))
456 e.pattern = tomoyo_get_name(pattern);
459 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
460 &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE],
461 tomoyo_same_no_rewrite);
462 tomoyo_put_name(e.pattern);
467 * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited.
469 * @filename: Filename to check.
471 * Returns true if @filename is specified by "deny_rewrite" directive,
474 * Caller holds tomoyo_read_lock().
476 static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename)
478 struct tomoyo_no_rewrite_entry *ptr;
481 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE],
483 if (ptr->head.is_deleted)
485 if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
494 * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list.
496 * @data: String to parse.
497 * @is_delete: True if it is a delete request.
499 * Returns 0 on success, negative value otherwise.
501 * Caller holds tomoyo_read_lock().
503 int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete)
505 return tomoyo_update_no_rewrite_entry(data, is_delete);
508 static bool tomoyo_check_path_acl(const struct tomoyo_request_info *r,
509 const struct tomoyo_acl_info *ptr)
511 const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
513 return (acl->perm & (1 << r->param.path.operation)) &&
514 tomoyo_compare_name_union(r->param.path.filename, &acl->name);
517 static bool tomoyo_check_path_number_acl(const struct tomoyo_request_info *r,
518 const struct tomoyo_acl_info *ptr)
520 const struct tomoyo_path_number_acl *acl =
521 container_of(ptr, typeof(*acl), head);
522 return (acl->perm & (1 << r->param.path_number.operation)) &&
523 tomoyo_compare_number_union(r->param.path_number.number,
525 tomoyo_compare_name_union(r->param.path_number.filename,
529 static bool tomoyo_check_path2_acl(const struct tomoyo_request_info *r,
530 const struct tomoyo_acl_info *ptr)
532 const struct tomoyo_path2_acl *acl =
533 container_of(ptr, typeof(*acl), head);
534 return (acl->perm & (1 << r->param.path2.operation)) &&
535 tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
536 && tomoyo_compare_name_union(r->param.path2.filename2,
540 static bool tomoyo_check_mkdev_acl(const struct tomoyo_request_info *r,
541 const struct tomoyo_acl_info *ptr)
543 const struct tomoyo_mkdev_acl *acl =
544 container_of(ptr, typeof(*acl), head);
545 return (acl->perm & (1 << r->param.mkdev.operation)) &&
546 tomoyo_compare_number_union(r->param.mkdev.mode,
548 tomoyo_compare_number_union(r->param.mkdev.major,
550 tomoyo_compare_number_union(r->param.mkdev.minor,
552 tomoyo_compare_name_union(r->param.mkdev.filename,
556 static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
557 const struct tomoyo_acl_info *b)
559 const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
560 const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
561 return tomoyo_same_acl_head(&p1->head, &p2->head) &&
562 tomoyo_same_name_union(&p1->name, &p2->name);
565 static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
566 struct tomoyo_acl_info *b,
567 const bool is_delete)
569 u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
572 const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
575 if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK)
576 perm &= ~(1 << TOMOYO_TYPE_READ_WRITE);
577 else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE)))
578 perm &= ~TOMOYO_RW_MASK;
581 if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK)
582 perm |= (1 << TOMOYO_TYPE_READ_WRITE);
583 else if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
584 perm |= TOMOYO_RW_MASK;
591 * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
593 * @type: Type of operation.
594 * @filename: Filename.
595 * @domain: Pointer to "struct tomoyo_domain_info".
596 * @is_delete: True if it is a delete request.
598 * Returns 0 on success, negative value otherwise.
600 * Caller holds tomoyo_read_lock().
602 static int tomoyo_update_path_acl(const u8 type, const char *filename,
603 struct tomoyo_domain_info * const domain,
604 const bool is_delete)
606 struct tomoyo_path_acl e = {
607 .head.type = TOMOYO_TYPE_PATH_ACL,
611 if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE))
612 e.perm |= TOMOYO_RW_MASK;
613 if (!tomoyo_parse_name_union(filename, &e.name))
615 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
616 tomoyo_same_path_acl,
617 tomoyo_merge_path_acl);
618 tomoyo_put_name_union(&e.name);
622 static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
623 const struct tomoyo_acl_info *b)
625 const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1),
627 const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2),
629 return tomoyo_same_acl_head(&p1->head, &p2->head)
630 && tomoyo_same_name_union(&p1->name, &p2->name)
631 && tomoyo_same_number_union(&p1->mode, &p2->mode)
632 && tomoyo_same_number_union(&p1->major, &p2->major)
633 && tomoyo_same_number_union(&p1->minor, &p2->minor);
636 static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
637 struct tomoyo_acl_info *b,
638 const bool is_delete)
640 u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
643 const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
654 * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
656 * @type: Type of operation.
657 * @filename: Filename.
658 * @mode: Create mode.
659 * @major: Device major number.
660 * @minor: Device minor number.
661 * @domain: Pointer to "struct tomoyo_domain_info".
662 * @is_delete: True if it is a delete request.
664 * Returns 0 on success, negative value otherwise.
666 * Caller holds tomoyo_read_lock().
668 static int tomoyo_update_mkdev_acl(const u8 type, const char *filename,
669 char *mode, char *major, char *minor,
670 struct tomoyo_domain_info * const
671 domain, const bool is_delete)
673 struct tomoyo_mkdev_acl e = {
674 .head.type = TOMOYO_TYPE_MKDEV_ACL,
677 int error = is_delete ? -ENOENT : -ENOMEM;
678 if (!tomoyo_parse_name_union(filename, &e.name) ||
679 !tomoyo_parse_number_union(mode, &e.mode) ||
680 !tomoyo_parse_number_union(major, &e.major) ||
681 !tomoyo_parse_number_union(minor, &e.minor))
683 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
684 tomoyo_same_mkdev_acl,
685 tomoyo_merge_mkdev_acl);
687 tomoyo_put_name_union(&e.name);
688 tomoyo_put_number_union(&e.mode);
689 tomoyo_put_number_union(&e.major);
690 tomoyo_put_number_union(&e.minor);
694 static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
695 const struct tomoyo_acl_info *b)
697 const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
698 const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
699 return tomoyo_same_acl_head(&p1->head, &p2->head)
700 && tomoyo_same_name_union(&p1->name1, &p2->name1)
701 && tomoyo_same_name_union(&p1->name2, &p2->name2);
704 static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
705 struct tomoyo_acl_info *b,
706 const bool is_delete)
708 u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
711 const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
721 * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
723 * @type: Type of operation.
724 * @filename1: First filename.
725 * @filename2: Second filename.
726 * @domain: Pointer to "struct tomoyo_domain_info".
727 * @is_delete: True if it is a delete request.
729 * Returns 0 on success, negative value otherwise.
731 * Caller holds tomoyo_read_lock().
733 static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
734 const char *filename2,
735 struct tomoyo_domain_info * const domain,
736 const bool is_delete)
738 struct tomoyo_path2_acl e = {
739 .head.type = TOMOYO_TYPE_PATH2_ACL,
742 int error = is_delete ? -ENOENT : -ENOMEM;
743 if (!tomoyo_parse_name_union(filename1, &e.name1) ||
744 !tomoyo_parse_name_union(filename2, &e.name2))
746 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
747 tomoyo_same_path2_acl,
748 tomoyo_merge_path2_acl);
750 tomoyo_put_name_union(&e.name1);
751 tomoyo_put_name_union(&e.name2);
756 * tomoyo_path_permission - Check permission for single path operation.
758 * @r: Pointer to "struct tomoyo_request_info".
759 * @operation: Type of operation.
760 * @filename: Filename to check.
762 * Returns 0 on success, negative value otherwise.
764 * Caller holds tomoyo_read_lock().
766 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
767 const struct tomoyo_path_info *filename)
772 r->type = tomoyo_p2mac[operation];
773 r->mode = tomoyo_get_mode(r->profile, r->type);
774 if (r->mode == TOMOYO_CONFIG_DISABLED)
776 r->param_type = TOMOYO_TYPE_PATH_ACL;
777 r->param.path.filename = filename;
778 r->param.path.operation = operation;
780 tomoyo_check_acl(r, tomoyo_check_path_acl);
781 if (!r->granted && operation == TOMOYO_TYPE_READ &&
782 !r->domain->ignore_global_allow_read &&
783 tomoyo_globally_readable_file(filename))
785 error = tomoyo_audit_path_log(r);
787 * Do not retry for execute request, for alias may have
790 } while (error == TOMOYO_RETRY_REQUEST &&
791 operation != TOMOYO_TYPE_EXECUTE);
793 * Since "allow_truncate" doesn't imply "allow_rewrite" permission,
794 * we need to check "allow_rewrite" permission if the filename is
795 * specified by "deny_rewrite" keyword.
797 if (!error && operation == TOMOYO_TYPE_TRUNCATE &&
798 tomoyo_no_rewrite_file(filename)) {
799 operation = TOMOYO_TYPE_REWRITE;
805 static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
806 const struct tomoyo_acl_info *b)
808 const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
810 const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
812 return tomoyo_same_acl_head(&p1->head, &p2->head)
813 && tomoyo_same_name_union(&p1->name, &p2->name)
814 && tomoyo_same_number_union(&p1->number, &p2->number);
817 static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
818 struct tomoyo_acl_info *b,
819 const bool is_delete)
821 u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
824 const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
835 * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
837 * @type: Type of operation.
838 * @filename: Filename.
840 * @domain: Pointer to "struct tomoyo_domain_info".
841 * @is_delete: True if it is a delete request.
843 * Returns 0 on success, negative value otherwise.
845 static int tomoyo_update_path_number_acl(const u8 type, const char *filename,
847 struct tomoyo_domain_info * const
849 const bool is_delete)
851 struct tomoyo_path_number_acl e = {
852 .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
855 int error = is_delete ? -ENOENT : -ENOMEM;
856 if (!tomoyo_parse_name_union(filename, &e.name))
858 if (!tomoyo_parse_number_union(number, &e.number))
860 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
861 tomoyo_same_path_number_acl,
862 tomoyo_merge_path_number_acl);
864 tomoyo_put_name_union(&e.name);
865 tomoyo_put_number_union(&e.number);
870 * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
872 * @type: Type of operation.
873 * @path: Pointer to "struct path".
876 * Returns 0 on success, negative value otherwise.
878 int tomoyo_path_number_perm(const u8 type, struct path *path,
879 unsigned long number)
881 struct tomoyo_request_info r;
883 struct tomoyo_path_info buf;
886 if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
887 == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry)
889 idx = tomoyo_read_lock();
890 if (!tomoyo_get_realpath(&buf, path))
892 if (type == TOMOYO_TYPE_MKDIR)
893 tomoyo_add_slash(&buf);
894 r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
895 r.param.path_number.operation = type;
896 r.param.path_number.filename = &buf;
897 r.param.path_number.number = number;
899 tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
900 error = tomoyo_audit_path_number_log(&r);
901 } while (error == TOMOYO_RETRY_REQUEST);
904 tomoyo_read_unlock(idx);
905 if (r.mode != TOMOYO_CONFIG_ENFORCING)
911 * tomoyo_check_open_permission - Check permission for "read" and "write".
913 * @domain: Pointer to "struct tomoyo_domain_info".
914 * @path: Pointer to "struct path".
915 * @flag: Flags for open().
917 * Returns 0 on success, negative value otherwise.
919 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
920 struct path *path, const int flag)
922 const u8 acc_mode = ACC_MODE(flag);
924 struct tomoyo_path_info buf;
925 struct tomoyo_request_info r;
929 (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)))
932 r.mode = TOMOYO_CONFIG_DISABLED;
933 idx = tomoyo_read_lock();
934 if (!tomoyo_get_realpath(&buf, path))
938 * If the filename is specified by "deny_rewrite" keyword,
939 * we need to check "allow_rewrite" permission when the filename is not
940 * opened for append mode or the filename is truncated at open time.
942 if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND)
943 && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE)
944 != TOMOYO_CONFIG_DISABLED) {
945 if (!tomoyo_get_realpath(&buf, path)) {
949 if (tomoyo_no_rewrite_file(&buf))
950 error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE,
953 if (!error && acc_mode &&
954 tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
955 != TOMOYO_CONFIG_DISABLED) {
957 if (!buf.name && !tomoyo_get_realpath(&buf, path)) {
961 if (acc_mode == (MAY_READ | MAY_WRITE))
962 operation = TOMOYO_TYPE_READ_WRITE;
963 else if (acc_mode == MAY_READ)
964 operation = TOMOYO_TYPE_READ;
966 operation = TOMOYO_TYPE_WRITE;
967 error = tomoyo_path_permission(&r, operation, &buf);
971 tomoyo_read_unlock(idx);
972 if (r.mode != TOMOYO_CONFIG_ENFORCING)
978 * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount".
980 * @operation: Type of operation.
981 * @path: Pointer to "struct path".
983 * Returns 0 on success, negative value otherwise.
985 int tomoyo_path_perm(const u8 operation, struct path *path)
988 struct tomoyo_path_info buf;
989 struct tomoyo_request_info r;
994 if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
995 == TOMOYO_CONFIG_DISABLED)
998 idx = tomoyo_read_lock();
999 if (!tomoyo_get_realpath(&buf, path))
1001 switch (operation) {
1002 case TOMOYO_TYPE_REWRITE:
1003 if (!tomoyo_no_rewrite_file(&buf)) {
1008 case TOMOYO_TYPE_RMDIR:
1009 case TOMOYO_TYPE_CHROOT:
1010 case TOMOYO_TYPE_UMOUNT:
1011 tomoyo_add_slash(&buf);
1014 error = tomoyo_path_permission(&r, operation, &buf);
1017 tomoyo_read_unlock(idx);
1018 if (r.mode != TOMOYO_CONFIG_ENFORCING)
1024 * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
1026 * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
1027 * @path: Pointer to "struct path".
1028 * @mode: Create mode.
1029 * @dev: Device number.
1031 * Returns 0 on success, negative value otherwise.
1033 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
1034 const unsigned int mode, unsigned int dev)
1036 struct tomoyo_request_info r;
1037 int error = -ENOMEM;
1038 struct tomoyo_path_info buf;
1042 tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
1043 == TOMOYO_CONFIG_DISABLED)
1045 idx = tomoyo_read_lock();
1047 if (tomoyo_get_realpath(&buf, path)) {
1048 dev = new_decode_dev(dev);
1049 r.param_type = TOMOYO_TYPE_MKDEV_ACL;
1050 r.param.mkdev.filename = &buf;
1051 r.param.mkdev.operation = operation;
1052 r.param.mkdev.mode = mode;
1053 r.param.mkdev.major = MAJOR(dev);
1054 r.param.mkdev.minor = MINOR(dev);
1055 tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
1056 error = tomoyo_audit_mkdev_log(&r);
1059 tomoyo_read_unlock(idx);
1060 if (r.mode != TOMOYO_CONFIG_ENFORCING)
1066 * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
1068 * @operation: Type of operation.
1069 * @path1: Pointer to "struct path".
1070 * @path2: Pointer to "struct path".
1072 * Returns 0 on success, negative value otherwise.
1074 int tomoyo_path2_perm(const u8 operation, struct path *path1,
1077 int error = -ENOMEM;
1078 struct tomoyo_path_info buf1;
1079 struct tomoyo_path_info buf2;
1080 struct tomoyo_request_info r;
1083 if (!path1->mnt || !path2->mnt ||
1084 tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
1085 == TOMOYO_CONFIG_DISABLED)
1089 idx = tomoyo_read_lock();
1090 if (!tomoyo_get_realpath(&buf1, path1) ||
1091 !tomoyo_get_realpath(&buf2, path2))
1093 switch (operation) {
1094 struct dentry *dentry;
1095 case TOMOYO_TYPE_RENAME:
1096 case TOMOYO_TYPE_LINK:
1097 dentry = path1->dentry;
1098 if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
1101 case TOMOYO_TYPE_PIVOT_ROOT:
1102 tomoyo_add_slash(&buf1);
1103 tomoyo_add_slash(&buf2);
1106 r.param_type = TOMOYO_TYPE_PATH2_ACL;
1107 r.param.path2.operation = operation;
1108 r.param.path2.filename1 = &buf1;
1109 r.param.path2.filename2 = &buf2;
1111 tomoyo_check_acl(&r, tomoyo_check_path2_acl);
1112 error = tomoyo_audit_path2_log(&r);
1113 } while (error == TOMOYO_RETRY_REQUEST);
1117 tomoyo_read_unlock(idx);
1118 if (r.mode != TOMOYO_CONFIG_ENFORCING)
1124 * tomoyo_write_file_policy - Update file related list.
1126 * @data: String to parse.
1127 * @domain: Pointer to "struct tomoyo_domain_info".
1128 * @is_delete: True if it is a delete request.
1130 * Returns 0 on success, negative value otherwise.
1132 * Caller holds tomoyo_read_lock().
1134 int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
1135 const bool is_delete)
1139 if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
1141 if (strncmp(w[0], "allow_", 6))
1144 for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) {
1145 if (strcmp(w[0], tomoyo_path_keyword[type]))
1147 return tomoyo_update_path_acl(type, w[1], domain, is_delete);
1151 for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) {
1152 if (strcmp(w[0], tomoyo_path2_keyword[type]))
1154 return tomoyo_update_path2_acl(type, w[1], w[2], domain,
1157 for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) {
1158 if (strcmp(w[0], tomoyo_path_number_keyword[type]))
1160 return tomoyo_update_path_number_acl(type, w[1], w[2], domain,
1163 if (!w[3][0] || !w[4][0])
1165 for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) {
1166 if (strcmp(w[0], tomoyo_mkdev_keyword[type]))
1168 return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3],
1169 w[4], domain, is_delete);