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ptrace: wait_consider_task: s/same_thread_group/ptrace_reparented/
[linux-2.6/next.git] / security / tomoyo / file.c
blobd64e8ecb6fb3e7cbb923cbf80e8cbb993872279b
1 /*
2 * security/tomoyo/file.c
3 *
4 * Pathname restriction functions.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9 #include "common.h"
10 #include <linux/slab.h>
11
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",
25 };
26
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",
31 };
32
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",
38 };
39
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",
50 };
51
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,
64 };
65
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,
69 };
70
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,
75 };
76
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,
86 };
87
88 void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
89 {
90 if (!ptr)
91 return;
92 if (ptr->is_group)
93 tomoyo_put_group(ptr->group);
94 else
95 tomoyo_put_name(ptr->filename);
96 }
97
98 const struct tomoyo_path_info *
99 tomoyo_compare_name_union(const struct tomoyo_path_info *name,
100 const struct tomoyo_name_union *ptr)
101 {
102 if (ptr->is_group)
103 return tomoyo_path_matches_group(name, ptr->group);
104 if (tomoyo_path_matches_pattern(name, ptr->filename))
105 return ptr->filename;
106 return NULL;
107 }
108
109 void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
110 {
111 if (ptr && ptr->is_group)
112 tomoyo_put_group(ptr->group);
113 }
114
115 bool tomoyo_compare_number_union(const unsigned long value,
116 const struct tomoyo_number_union *ptr)
117 {
118 if (ptr->is_group)
119 return tomoyo_number_matches_group(value, value, ptr->group);
120 return value >= ptr->values[0] && value <= ptr->values[1];
121 }
122
123 static void tomoyo_add_slash(struct tomoyo_path_info *buf)
124 {
125 if (buf->is_dir)
126 return;
127 /*
128 * This is OK because tomoyo_encode() reserves space for appending "/".
129 */
130 strcat((char *) buf->name, "/");
131 tomoyo_fill_path_info(buf);
132 }
133
134 /**
135 * tomoyo_strendswith - Check whether the token ends with the given token.
136 *
137 * @name: The token to check.
138 * @tail: The token to find.
139 *
140 * Returns true if @name ends with @tail, false otherwise.
141 */
142 static bool tomoyo_strendswith(const char *name, const char *tail)
143 {
144 int len;
145
146 if (!name || !tail)
147 return false;
148 len = strlen(name) - strlen(tail);
149 return len >= 0 && !strcmp(name + len, tail);
150 }
151
152 /**
153 * tomoyo_get_realpath - Get realpath.
154 *
155 * @buf: Pointer to "struct tomoyo_path_info".
156 * @path: Pointer to "struct path".
157 *
158 * Returns true on success, false otherwise.
159 */
160 static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path)
161 {
162 buf->name = tomoyo_realpath_from_path(path);
163 if (buf->name) {
164 tomoyo_fill_path_info(buf);
165 return true;
166 }
167 return false;
168 }
169
170 /**
171 * tomoyo_audit_path_log - Audit path request log.
172 *
173 * @r: Pointer to "struct tomoyo_request_info".
174 *
175 * Returns 0 on success, negative value otherwise.
176 */
177 static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
178 {
179 const char *operation = tomoyo_path_keyword[r->param.path.operation];
180 const struct tomoyo_path_info *filename = r->param.path.filename;
181 if (r->granted)
182 return 0;
183 tomoyo_warn_log(r, "%s %s", operation, filename->name);
184 return tomoyo_supervisor(r, "allow_%s %s\n", operation,
185 tomoyo_pattern(filename));
186 }
187
188 /**
189 * tomoyo_audit_path2_log - Audit path/path request log.
190 *
191 * @r: Pointer to "struct tomoyo_request_info".
192 *
193 * Returns 0 on success, negative value otherwise.
194 */
195 static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
196 {
197 const char *operation = tomoyo_path2_keyword[r->param.path2.operation];
198 const struct tomoyo_path_info *filename1 = r->param.path2.filename1;
199 const struct tomoyo_path_info *filename2 = r->param.path2.filename2;
200 if (r->granted)
201 return 0;
202 tomoyo_warn_log(r, "%s %s %s", operation, filename1->name,
203 filename2->name);
204 return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
205 tomoyo_pattern(filename1),
206 tomoyo_pattern(filename2));
207 }
208
209 /**
210 * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
211 *
212 * @r: Pointer to "struct tomoyo_request_info".
213 *
214 * Returns 0 on success, negative value otherwise.
215 */
216 static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
217 {
218 const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation];
219 const struct tomoyo_path_info *filename = r->param.mkdev.filename;
220 const unsigned int major = r->param.mkdev.major;
221 const unsigned int minor = r->param.mkdev.minor;
222 const unsigned int mode = r->param.mkdev.mode;
223 if (r->granted)
224 return 0;
225 tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode,
226 major, minor);
227 return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation,
228 tomoyo_pattern(filename), mode, major, minor);
229 }
230
231 /**
232 * tomoyo_audit_path_number_log - Audit path/number request log.
233 *
234 * @r: Pointer to "struct tomoyo_request_info".
235 * @error: Error code.
236 *
237 * Returns 0 on success, negative value otherwise.
238 */
239 static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
240 {
241 const u8 type = r->param.path_number.operation;
242 u8 radix;
243 const struct tomoyo_path_info *filename = r->param.path_number.filename;
244 const char *operation = tomoyo_path_number_keyword[type];
245 char buffer[64];
246 if (r->granted)
247 return 0;
248 switch (type) {
249 case TOMOYO_TYPE_CREATE:
250 case TOMOYO_TYPE_MKDIR:
251 case TOMOYO_TYPE_MKFIFO:
252 case TOMOYO_TYPE_MKSOCK:
253 case TOMOYO_TYPE_CHMOD:
254 radix = TOMOYO_VALUE_TYPE_OCTAL;
255 break;
256 case TOMOYO_TYPE_IOCTL:
257 radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
258 break;
259 default:
260 radix = TOMOYO_VALUE_TYPE_DECIMAL;
261 break;
262 }
263 tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
264 radix);
265 tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer);
266 return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
267 tomoyo_pattern(filename), buffer);
268 }
269
270 static bool tomoyo_same_globally_readable(const struct tomoyo_acl_head *a,
271 const struct tomoyo_acl_head *b)
272 {
273 return container_of(a, struct tomoyo_readable_file,
274 head)->filename ==
275 container_of(b, struct tomoyo_readable_file,
276 head)->filename;
277 }
278
279 /**
280 * tomoyo_update_globally_readable_entry - Update "struct tomoyo_readable_file" list.
281 *
282 * @filename: Filename unconditionally permitted to open() for reading.
283 * @is_delete: True if it is a delete request.
284 *
285 * Returns 0 on success, negative value otherwise.
286 *
287 * Caller holds tomoyo_read_lock().
288 */
289 static int tomoyo_update_globally_readable_entry(const char *filename,
290 const bool is_delete)
291 {
292 struct tomoyo_readable_file e = { };
293 int error;
294
295 if (!tomoyo_correct_word(filename))
296 return -EINVAL;
297 e.filename = tomoyo_get_name(filename);
298 if (!e.filename)
299 return -ENOMEM;
300 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
301 &tomoyo_policy_list
302 [TOMOYO_ID_GLOBALLY_READABLE],
303 tomoyo_same_globally_readable);
304 tomoyo_put_name(e.filename);
305 return error;
306 }
307
308 /**
309 * tomoyo_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading.
310 *
311 * @filename: The filename to check.
312 *
313 * Returns true if any domain can open @filename for reading, false otherwise.
314 *
315 * Caller holds tomoyo_read_lock().
316 */
317 static bool tomoyo_globally_readable_file(const struct tomoyo_path_info *
318 filename)
319 {
320 struct tomoyo_readable_file *ptr;
321 bool found = false;
322
323 list_for_each_entry_rcu(ptr, &tomoyo_policy_list
324 [TOMOYO_ID_GLOBALLY_READABLE], head.list) {
325 if (!ptr->head.is_deleted &&
326 tomoyo_path_matches_pattern(filename, ptr->filename)) {
327 found = true;
328 break;
329 }
330 }
331 return found;
332 }
333
334 /**
335 * tomoyo_write_globally_readable - Write "struct tomoyo_readable_file" list.
336 *
337 * @data: String to parse.
338 * @is_delete: True if it is a delete request.
339 *
340 * Returns 0 on success, negative value otherwise.
341 *
342 * Caller holds tomoyo_read_lock().
343 */
344 int tomoyo_write_globally_readable(char *data, const bool is_delete)
345 {
346 return tomoyo_update_globally_readable_entry(data, is_delete);
347 }
348
349 static bool tomoyo_same_pattern(const struct tomoyo_acl_head *a,
350 const struct tomoyo_acl_head *b)
351 {
352 return container_of(a, struct tomoyo_no_pattern, head)->pattern ==
353 container_of(b, struct tomoyo_no_pattern, head)->pattern;
354 }
355
356 /**
357 * tomoyo_update_file_pattern_entry - Update "struct tomoyo_no_pattern" list.
358 *
359 * @pattern: Pathname pattern.
360 * @is_delete: True if it is a delete request.
361 *
362 * Returns 0 on success, negative value otherwise.
363 *
364 * Caller holds tomoyo_read_lock().
365 */
366 static int tomoyo_update_file_pattern_entry(const char *pattern,
367 const bool is_delete)
368 {
369 struct tomoyo_no_pattern e = { };
370 int error;
371
372 if (!tomoyo_correct_word(pattern))
373 return -EINVAL;
374 e.pattern = tomoyo_get_name(pattern);
375 if (!e.pattern)
376 return -ENOMEM;
377 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
378 &tomoyo_policy_list[TOMOYO_ID_PATTERN],
379 tomoyo_same_pattern);
380 tomoyo_put_name(e.pattern);
381 return error;
382 }
383
384 /**
385 * tomoyo_pattern - Get patterned pathname.
386 *
387 * @filename: The filename to find patterned pathname.
388 *
389 * Returns pointer to pathname pattern if matched, @filename otherwise.
390 *
391 * Caller holds tomoyo_read_lock().
392 */
393 const char *tomoyo_pattern(const struct tomoyo_path_info *filename)
394 {
395 struct tomoyo_no_pattern *ptr;
396 const struct tomoyo_path_info *pattern = NULL;
397
398 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_PATTERN],
399 head.list) {
400 if (ptr->head.is_deleted)
401 continue;
402 if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
403 continue;
404 pattern = ptr->pattern;
405 if (tomoyo_strendswith(pattern->name, "/\\*")) {
406 /* Do nothing. Try to find the better match. */
407 } else {
408 /* This would be the better match. Use this. */
409 break;
410 }
411 }
412 if (pattern)
413 filename = pattern;
414 return filename->name;
415 }
416
417 /**
418 * tomoyo_write_pattern - Write "struct tomoyo_no_pattern" list.
419 *
420 * @data: String to parse.
421 * @is_delete: True if it is a delete request.
422 *
423 * Returns 0 on success, negative value otherwise.
424 *
425 * Caller holds tomoyo_read_lock().
426 */
427 int tomoyo_write_pattern(char *data, const bool is_delete)
428 {
429 return tomoyo_update_file_pattern_entry(data, is_delete);
430 }
431
432 static bool tomoyo_same_no_rewrite(const struct tomoyo_acl_head *a,
433 const struct tomoyo_acl_head *b)
434 {
435 return container_of(a, struct tomoyo_no_rewrite, head)->pattern
436 == container_of(b, struct tomoyo_no_rewrite, head)
437 ->pattern;
438 }
439
440 /**
441 * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite" list.
442 *
443 * @pattern: Pathname pattern that are not rewritable by default.
444 * @is_delete: True if it is a delete request.
445 *
446 * Returns 0 on success, negative value otherwise.
447 *
448 * Caller holds tomoyo_read_lock().
449 */
450 static int tomoyo_update_no_rewrite_entry(const char *pattern,
451 const bool is_delete)
452 {
453 struct tomoyo_no_rewrite e = { };
454 int error;
455
456 if (!tomoyo_correct_word(pattern))
457 return -EINVAL;
458 e.pattern = tomoyo_get_name(pattern);
459 if (!e.pattern)
460 return -ENOMEM;
461 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
462 &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE],
463 tomoyo_same_no_rewrite);
464 tomoyo_put_name(e.pattern);
465 return error;
466 }
467
468 /**
469 * tomoyo_no_rewrite_file - Check if the given pathname is not permitted to be rewrited.
470 *
471 * @filename: Filename to check.
472 *
473 * Returns true if @filename is specified by "deny_rewrite" directive,
474 * false otherwise.
475 *
476 * Caller holds tomoyo_read_lock().
477 */
478 static bool tomoyo_no_rewrite_file(const struct tomoyo_path_info *filename)
479 {
480 struct tomoyo_no_rewrite *ptr;
481 bool found = false;
482
483 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_NO_REWRITE],
484 head.list) {
485 if (ptr->head.is_deleted)
486 continue;
487 if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
488 continue;
489 found = true;
490 break;
491 }
492 return found;
493 }
494
495 /**
496 * tomoyo_write_no_rewrite - Write "struct tomoyo_no_rewrite" list.
497 *
498 * @data: String to parse.
499 * @is_delete: True if it is a delete request.
500 *
501 * Returns 0 on success, negative value otherwise.
502 *
503 * Caller holds tomoyo_read_lock().
504 */
505 int tomoyo_write_no_rewrite(char *data, const bool is_delete)
506 {
507 return tomoyo_update_no_rewrite_entry(data, is_delete);
508 }
509
510 static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
511 const struct tomoyo_acl_info *ptr)
512 {
513 const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
514 head);
515 if (acl->perm & (1 << r->param.path.operation)) {
516 r->param.path.matched_path =
517 tomoyo_compare_name_union(r->param.path.filename,
518 &acl->name);
519 return r->param.path.matched_path != NULL;
520 }
521 return false;
522 }
523
524 static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
525 const struct tomoyo_acl_info *ptr)
526 {
527 const struct tomoyo_path_number_acl *acl =
528 container_of(ptr, typeof(*acl), head);
529 return (acl->perm & (1 << r->param.path_number.operation)) &&
530 tomoyo_compare_number_union(r->param.path_number.number,
531 &acl->number) &&
532 tomoyo_compare_name_union(r->param.path_number.filename,
533 &acl->name);
534 }
535
536 static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
537 const struct tomoyo_acl_info *ptr)
538 {
539 const struct tomoyo_path2_acl *acl =
540 container_of(ptr, typeof(*acl), head);
541 return (acl->perm & (1 << r->param.path2.operation)) &&
542 tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
543 && tomoyo_compare_name_union(r->param.path2.filename2,
544 &acl->name2);
545 }
546
547 static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
548 const struct tomoyo_acl_info *ptr)
549 {
550 const struct tomoyo_mkdev_acl *acl =
551 container_of(ptr, typeof(*acl), head);
552 return (acl->perm & (1 << r->param.mkdev.operation)) &&
553 tomoyo_compare_number_union(r->param.mkdev.mode,
554 &acl->mode) &&
555 tomoyo_compare_number_union(r->param.mkdev.major,
556 &acl->major) &&
557 tomoyo_compare_number_union(r->param.mkdev.minor,
558 &acl->minor) &&
559 tomoyo_compare_name_union(r->param.mkdev.filename,
560 &acl->name);
561 }
562
563 static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
564 const struct tomoyo_acl_info *b)
565 {
566 const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
567 const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
568 return tomoyo_same_acl_head(&p1->head, &p2->head) &&
569 tomoyo_same_name_union(&p1->name, &p2->name);
570 }
571
572 static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
573 struct tomoyo_acl_info *b,
574 const bool is_delete)
575 {
576 u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
577 ->perm;
578 u16 perm = *a_perm;
579 const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
580 if (is_delete) {
581 perm &= ~b_perm;
582 if ((perm & TOMOYO_RW_MASK) != TOMOYO_RW_MASK)
583 perm &= ~(1 << TOMOYO_TYPE_READ_WRITE);
584 else if (!(perm & (1 << TOMOYO_TYPE_READ_WRITE)))
585 perm &= ~TOMOYO_RW_MASK;
586 } else {
587 perm |= b_perm;
588 if ((perm & TOMOYO_RW_MASK) == TOMOYO_RW_MASK)
589 perm |= (1 << TOMOYO_TYPE_READ_WRITE);
590 else if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
591 perm |= TOMOYO_RW_MASK;
592 }
593 *a_perm = perm;
594 return !perm;
595 }
596
597 /**
598 * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
599 *
600 * @type: Type of operation.
601 * @filename: Filename.
602 * @domain: Pointer to "struct tomoyo_domain_info".
603 * @is_delete: True if it is a delete request.
604 *
605 * Returns 0 on success, negative value otherwise.
606 *
607 * Caller holds tomoyo_read_lock().
608 */
609 static int tomoyo_update_path_acl(const u8 type, const char *filename,
610 struct tomoyo_domain_info * const domain,
611 const bool is_delete)
612 {
613 struct tomoyo_path_acl e = {
614 .head.type = TOMOYO_TYPE_PATH_ACL,
615 .perm = 1 << type
616 };
617 int error;
618 if (e.perm == (1 << TOMOYO_TYPE_READ_WRITE))
619 e.perm |= TOMOYO_RW_MASK;
620 if (!tomoyo_parse_name_union(filename, &e.name))
621 return -EINVAL;
622 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
623 tomoyo_same_path_acl,
624 tomoyo_merge_path_acl);
625 tomoyo_put_name_union(&e.name);
626 return error;
627 }
628
629 static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
630 const struct tomoyo_acl_info *b)
631 {
632 const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1),
633 head);
634 const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2),
635 head);
636 return tomoyo_same_acl_head(&p1->head, &p2->head)
637 && tomoyo_same_name_union(&p1->name, &p2->name)
638 && tomoyo_same_number_union(&p1->mode, &p2->mode)
639 && tomoyo_same_number_union(&p1->major, &p2->major)
640 && tomoyo_same_number_union(&p1->minor, &p2->minor);
641 }
642
643 static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
644 struct tomoyo_acl_info *b,
645 const bool is_delete)
646 {
647 u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
648 head)->perm;
649 u8 perm = *a_perm;
650 const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
651 ->perm;
652 if (is_delete)
653 perm &= ~b_perm;
654 else
655 perm |= b_perm;
656 *a_perm = perm;
657 return !perm;
658 }
659
660 /**
661 * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
662 *
663 * @type: Type of operation.
664 * @filename: Filename.
665 * @mode: Create mode.
666 * @major: Device major number.
667 * @minor: Device minor number.
668 * @domain: Pointer to "struct tomoyo_domain_info".
669 * @is_delete: True if it is a delete request.
670 *
671 * Returns 0 on success, negative value otherwise.
672 *
673 * Caller holds tomoyo_read_lock().
674 */
675 static int tomoyo_update_mkdev_acl(const u8 type, const char *filename,
676 char *mode, char *major, char *minor,
677 struct tomoyo_domain_info * const
678 domain, const bool is_delete)
679 {
680 struct tomoyo_mkdev_acl e = {
681 .head.type = TOMOYO_TYPE_MKDEV_ACL,
682 .perm = 1 << type
683 };
684 int error = is_delete ? -ENOENT : -ENOMEM;
685 if (!tomoyo_parse_name_union(filename, &e.name) ||
686 !tomoyo_parse_number_union(mode, &e.mode) ||
687 !tomoyo_parse_number_union(major, &e.major) ||
688 !tomoyo_parse_number_union(minor, &e.minor))
689 goto out;
690 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
691 tomoyo_same_mkdev_acl,
692 tomoyo_merge_mkdev_acl);
693 out:
694 tomoyo_put_name_union(&e.name);
695 tomoyo_put_number_union(&e.mode);
696 tomoyo_put_number_union(&e.major);
697 tomoyo_put_number_union(&e.minor);
698 return error;
699 }
700
701 static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
702 const struct tomoyo_acl_info *b)
703 {
704 const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
705 const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
706 return tomoyo_same_acl_head(&p1->head, &p2->head)
707 && tomoyo_same_name_union(&p1->name1, &p2->name1)
708 && tomoyo_same_name_union(&p1->name2, &p2->name2);
709 }
710
711 static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
712 struct tomoyo_acl_info *b,
713 const bool is_delete)
714 {
715 u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
716 ->perm;
717 u8 perm = *a_perm;
718 const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
719 if (is_delete)
720 perm &= ~b_perm;
721 else
722 perm |= b_perm;
723 *a_perm = perm;
724 return !perm;
725 }
726
727 /**
728 * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
729 *
730 * @type: Type of operation.
731 * @filename1: First filename.
732 * @filename2: Second filename.
733 * @domain: Pointer to "struct tomoyo_domain_info".
734 * @is_delete: True if it is a delete request.
735 *
736 * Returns 0 on success, negative value otherwise.
737 *
738 * Caller holds tomoyo_read_lock().
739 */
740 static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
741 const char *filename2,
742 struct tomoyo_domain_info * const domain,
743 const bool is_delete)
744 {
745 struct tomoyo_path2_acl e = {
746 .head.type = TOMOYO_TYPE_PATH2_ACL,
747 .perm = 1 << type
748 };
749 int error = is_delete ? -ENOENT : -ENOMEM;
750 if (!tomoyo_parse_name_union(filename1, &e.name1) ||
751 !tomoyo_parse_name_union(filename2, &e.name2))
752 goto out;
753 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
754 tomoyo_same_path2_acl,
755 tomoyo_merge_path2_acl);
756 out:
757 tomoyo_put_name_union(&e.name1);
758 tomoyo_put_name_union(&e.name2);
759 return error;
760 }
761
762 /**
763 * tomoyo_path_permission - Check permission for single path operation.
764 *
765 * @r: Pointer to "struct tomoyo_request_info".
766 * @operation: Type of operation.
767 * @filename: Filename to check.
768 *
769 * Returns 0 on success, negative value otherwise.
770 *
771 * Caller holds tomoyo_read_lock().
772 */
773 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
774 const struct tomoyo_path_info *filename)
775 {
776 int error;
777
778 next:
779 r->type = tomoyo_p2mac[operation];
780 r->mode = tomoyo_get_mode(r->profile, r->type);
781 if (r->mode == TOMOYO_CONFIG_DISABLED)
782 return 0;
783 r->param_type = TOMOYO_TYPE_PATH_ACL;
784 r->param.path.filename = filename;
785 r->param.path.operation = operation;
786 do {
787 tomoyo_check_acl(r, tomoyo_check_path_acl);
788 if (!r->granted && operation == TOMOYO_TYPE_READ &&
789 !r->domain->ignore_global_allow_read &&
790 tomoyo_globally_readable_file(filename))
791 r->granted = true;
792 error = tomoyo_audit_path_log(r);
793 /*
794 * Do not retry for execute request, for alias may have
795 * changed.
796 */
797 } while (error == TOMOYO_RETRY_REQUEST &&
798 operation != TOMOYO_TYPE_EXECUTE);
799 /*
800 * Since "allow_truncate" doesn't imply "allow_rewrite" permission,
801 * we need to check "allow_rewrite" permission if the filename is
802 * specified by "deny_rewrite" keyword.
803 */
804 if (!error && operation == TOMOYO_TYPE_TRUNCATE &&
805 tomoyo_no_rewrite_file(filename)) {
806 operation = TOMOYO_TYPE_REWRITE;
807 goto next;
808 }
809 return error;
810 }
811
812 static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
813 const struct tomoyo_acl_info *b)
814 {
815 const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
816 head);
817 const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
818 head);
819 return tomoyo_same_acl_head(&p1->head, &p2->head)
820 && tomoyo_same_name_union(&p1->name, &p2->name)
821 && tomoyo_same_number_union(&p1->number, &p2->number);
822 }
823
824 static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
825 struct tomoyo_acl_info *b,
826 const bool is_delete)
827 {
828 u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
829 head)->perm;
830 u8 perm = *a_perm;
831 const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
832 ->perm;
833 if (is_delete)
834 perm &= ~b_perm;
835 else
836 perm |= b_perm;
837 *a_perm = perm;
838 return !perm;
839 }
840
841 /**
842 * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
843 *
844 * @type: Type of operation.
845 * @filename: Filename.
846 * @number: Number.
847 * @domain: Pointer to "struct tomoyo_domain_info".
848 * @is_delete: True if it is a delete request.
849 *
850 * Returns 0 on success, negative value otherwise.
851 */
852 static int tomoyo_update_path_number_acl(const u8 type, const char *filename,
853 char *number,
854 struct tomoyo_domain_info * const
855 domain,
856 const bool is_delete)
857 {
858 struct tomoyo_path_number_acl e = {
859 .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
860 .perm = 1 << type
861 };
862 int error = is_delete ? -ENOENT : -ENOMEM;
863 if (!tomoyo_parse_name_union(filename, &e.name))
864 return -EINVAL;
865 if (!tomoyo_parse_number_union(number, &e.number))
866 goto out;
867 error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
868 tomoyo_same_path_number_acl,
869 tomoyo_merge_path_number_acl);
870 out:
871 tomoyo_put_name_union(&e.name);
872 tomoyo_put_number_union(&e.number);
873 return error;
874 }
875
876 /**
877 * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
878 *
879 * @type: Type of operation.
880 * @path: Pointer to "struct path".
881 * @number: Number.
882 *
883 * Returns 0 on success, negative value otherwise.
884 */
885 int tomoyo_path_number_perm(const u8 type, struct path *path,
886 unsigned long number)
887 {
888 struct tomoyo_request_info r;
889 int error = -ENOMEM;
890 struct tomoyo_path_info buf;
891 int idx;
892
893 if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
894 == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry)
895 return 0;
896 idx = tomoyo_read_lock();
897 if (!tomoyo_get_realpath(&buf, path))
898 goto out;
899 if (type == TOMOYO_TYPE_MKDIR)
900 tomoyo_add_slash(&buf);
901 r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
902 r.param.path_number.operation = type;
903 r.param.path_number.filename = &buf;
904 r.param.path_number.number = number;
905 do {
906 tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
907 error = tomoyo_audit_path_number_log(&r);
908 } while (error == TOMOYO_RETRY_REQUEST);
909 kfree(buf.name);
910 out:
911 tomoyo_read_unlock(idx);
912 if (r.mode != TOMOYO_CONFIG_ENFORCING)
913 error = 0;
914 return error;
915 }
916
917 /**
918 * tomoyo_check_open_permission - Check permission for "read" and "write".
919 *
920 * @domain: Pointer to "struct tomoyo_domain_info".
921 * @path: Pointer to "struct path".
922 * @flag: Flags for open().
923 *
924 * Returns 0 on success, negative value otherwise.
925 */
926 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
927 struct path *path, const int flag)
928 {
929 const u8 acc_mode = ACC_MODE(flag);
930 int error = 0;
931 struct tomoyo_path_info buf;
932 struct tomoyo_request_info r;
933 int idx;
934
935 if (!path->mnt ||
936 (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)))
937 return 0;
938 buf.name = NULL;
939 r.mode = TOMOYO_CONFIG_DISABLED;
940 idx = tomoyo_read_lock();
941 /*
942 * If the filename is specified by "deny_rewrite" keyword,
943 * we need to check "allow_rewrite" permission when the filename is not
944 * opened for append mode or the filename is truncated at open time.
945 */
946 if ((acc_mode & MAY_WRITE) && !(flag & O_APPEND)
947 && tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_REWRITE)
948 != TOMOYO_CONFIG_DISABLED) {
949 if (!tomoyo_get_realpath(&buf, path)) {
950 error = -ENOMEM;
951 goto out;
952 }
953 if (tomoyo_no_rewrite_file(&buf))
954 error = tomoyo_path_permission(&r, TOMOYO_TYPE_REWRITE,
955 &buf);
956 }
957 if (!error && acc_mode &&
958 tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
959 != TOMOYO_CONFIG_DISABLED) {
960 u8 operation;
961 if (!buf.name && !tomoyo_get_realpath(&buf, path)) {
962 error = -ENOMEM;
963 goto out;
964 }
965 if (acc_mode == (MAY_READ | MAY_WRITE))
966 operation = TOMOYO_TYPE_READ_WRITE;
967 else if (acc_mode == MAY_READ)
968 operation = TOMOYO_TYPE_READ;
969 else
970 operation = TOMOYO_TYPE_WRITE;
971 error = tomoyo_path_permission(&r, operation, &buf);
972 }
973 out:
974 kfree(buf.name);
975 tomoyo_read_unlock(idx);
976 if (r.mode != TOMOYO_CONFIG_ENFORCING)
977 error = 0;
978 return error;
979 }
980
981 /**
982 * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "rewrite", "chroot" and "unmount".
983 *
984 * @operation: Type of operation.
985 * @path: Pointer to "struct path".
986 *
987 * Returns 0 on success, negative value otherwise.
988 */
989 int tomoyo_path_perm(const u8 operation, struct path *path)
990 {
991 int error = -ENOMEM;
992 struct tomoyo_path_info buf;
993 struct tomoyo_request_info r;
994 int idx;
995
996 if (!path->mnt)
997 return 0;
998 if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
999 == TOMOYO_CONFIG_DISABLED)
1000 return 0;
1001 buf.name = NULL;
1002 idx = tomoyo_read_lock();
1003 if (!tomoyo_get_realpath(&buf, path))
1004 goto out;
1005 switch (operation) {
1006 case TOMOYO_TYPE_REWRITE:
1007 if (!tomoyo_no_rewrite_file(&buf)) {
1008 error = 0;
1009 goto out;
1010 }
1011 break;
1012 case TOMOYO_TYPE_RMDIR:
1013 case TOMOYO_TYPE_CHROOT:
1014 tomoyo_add_slash(&buf);
1015 break;
1016 }
1017 error = tomoyo_path_permission(&r, operation, &buf);
1018 out:
1019 kfree(buf.name);
1020 tomoyo_read_unlock(idx);
1021 if (r.mode != TOMOYO_CONFIG_ENFORCING)
1022 error = 0;
1023 return error;
1024 }
1025
1026 /**
1027 * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
1028 *
1029 * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
1030 * @path: Pointer to "struct path".
1031 * @mode: Create mode.
1032 * @dev: Device number.
1033 *
1034 * Returns 0 on success, negative value otherwise.
1035 */
1036 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
1037 const unsigned int mode, unsigned int dev)
1038 {
1039 struct tomoyo_request_info r;
1040 int error = -ENOMEM;
1041 struct tomoyo_path_info buf;
1042 int idx;
1043
1044 if (!path->mnt ||
1045 tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
1046 == TOMOYO_CONFIG_DISABLED)
1047 return 0;
1048 idx = tomoyo_read_lock();
1049 error = -ENOMEM;
1050 if (tomoyo_get_realpath(&buf, path)) {
1051 dev = new_decode_dev(dev);
1052 r.param_type = TOMOYO_TYPE_MKDEV_ACL;
1053 r.param.mkdev.filename = &buf;
1054 r.param.mkdev.operation = operation;
1055 r.param.mkdev.mode = mode;
1056 r.param.mkdev.major = MAJOR(dev);
1057 r.param.mkdev.minor = MINOR(dev);
1058 tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
1059 error = tomoyo_audit_mkdev_log(&r);
1060 kfree(buf.name);
1061 }
1062 tomoyo_read_unlock(idx);
1063 if (r.mode != TOMOYO_CONFIG_ENFORCING)
1064 error = 0;
1065 return error;
1066 }
1067
1068 /**
1069 * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
1070 *
1071 * @operation: Type of operation.
1072 * @path1: Pointer to "struct path".
1073 * @path2: Pointer to "struct path".
1074 *
1075 * Returns 0 on success, negative value otherwise.
1076 */
1077 int tomoyo_path2_perm(const u8 operation, struct path *path1,
1078 struct path *path2)
1079 {
1080 int error = -ENOMEM;
1081 struct tomoyo_path_info buf1;
1082 struct tomoyo_path_info buf2;
1083 struct tomoyo_request_info r;
1084 int idx;
1085
1086 if (!path1->mnt || !path2->mnt ||
1087 tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
1088 == TOMOYO_CONFIG_DISABLED)
1089 return 0;
1090 buf1.name = NULL;
1091 buf2.name = NULL;
1092 idx = tomoyo_read_lock();
1093 if (!tomoyo_get_realpath(&buf1, path1) ||
1094 !tomoyo_get_realpath(&buf2, path2))
1095 goto out;
1096 switch (operation) {
1097 struct dentry *dentry;
1098 case TOMOYO_TYPE_RENAME:
1099 case TOMOYO_TYPE_LINK:
1100 dentry = path1->dentry;
1101 if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
1102 break;
1103 /* fall through */
1104 case TOMOYO_TYPE_PIVOT_ROOT:
1105 tomoyo_add_slash(&buf1);
1106 tomoyo_add_slash(&buf2);
1107 break;
1108 }
1109 r.param_type = TOMOYO_TYPE_PATH2_ACL;
1110 r.param.path2.operation = operation;
1111 r.param.path2.filename1 = &buf1;
1112 r.param.path2.filename2 = &buf2;
1113 do {
1114 tomoyo_check_acl(&r, tomoyo_check_path2_acl);
1115 error = tomoyo_audit_path2_log(&r);
1116 } while (error == TOMOYO_RETRY_REQUEST);
1117 out:
1118 kfree(buf1.name);
1119 kfree(buf2.name);
1120 tomoyo_read_unlock(idx);
1121 if (r.mode != TOMOYO_CONFIG_ENFORCING)
1122 error = 0;
1123 return error;
1124 }
1125
1126 /**
1127 * tomoyo_write_file - Update file related list.
1128 *
1129 * @data: String to parse.
1130 * @domain: Pointer to "struct tomoyo_domain_info".
1131 * @is_delete: True if it is a delete request.
1132 *
1133 * Returns 0 on success, negative value otherwise.
1134 *
1135 * Caller holds tomoyo_read_lock().
1136 */
1137 int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain,
1138 const bool is_delete)
1139 {
1140 char *w[5];
1141 u8 type;
1142 if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
1143 return -EINVAL;
1144 if (strncmp(w[0], "allow_", 6))
1145 goto out;
1146 w[0] += 6;
1147 for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) {
1148 if (strcmp(w[0], tomoyo_path_keyword[type]))
1149 continue;
1150 return tomoyo_update_path_acl(type, w[1], domain, is_delete);
1151 }
1152 if (!w[2][0])
1153 goto out;
1154 for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) {
1155 if (strcmp(w[0], tomoyo_path2_keyword[type]))
1156 continue;
1157 return tomoyo_update_path2_acl(type, w[1], w[2], domain,
1158 is_delete);
1159 }
1160 for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) {
1161 if (strcmp(w[0], tomoyo_path_number_keyword[type]))
1162 continue;
1163 return tomoyo_update_path_number_acl(type, w[1], w[2], domain,
1164 is_delete);
1165 }
1166 if (!w[3][0] || !w[4][0])
1167 goto out;
1168 for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) {
1169 if (strcmp(w[0], tomoyo_mkdev_keyword[type]))
1170 continue;
1171 return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3],
1172 w[4], domain, is_delete);
1173 }
1174 out:
1175 return -EINVAL;
1176 }
linux-next