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30e4b08905e32b8ea1b8f34345bb31dea60dae25
[deliverable/linux.git] / security / tomoyo / common.c
1 /*
2 * security/tomoyo/common.c
3 *
4 * Common functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9 #include <linux/uaccess.h>
10 #include <linux/slab.h>
11 #include <linux/security.h>
12 #include "common.h"
13
14 static struct tomoyo_profile tomoyo_default_profile = {
15 .learning = &tomoyo_default_profile.preference,
16 .permissive = &tomoyo_default_profile.preference,
17 .enforcing = &tomoyo_default_profile.preference,
18 .preference.enforcing_verbose = true,
19 .preference.learning_max_entry = 2048,
20 .preference.learning_verbose = false,
21 .preference.permissive_verbose = true
22 };
23
24 /* Profile version. Currently only 20090903 is defined. */
25 static unsigned int tomoyo_profile_version;
26
27 /* Profile table. Memory is allocated as needed. */
28 static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
29
30 /* String table for functionality that takes 4 modes. */
31 static const char *tomoyo_mode[4] = {
32 "disabled", "learning", "permissive", "enforcing"
33 };
34
35 /* String table for /sys/kernel/security/tomoyo/profile */
36 static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
37 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
38 [TOMOYO_MAC_FILE_EXECUTE] = "file::execute",
39 [TOMOYO_MAC_FILE_OPEN] = "file::open",
40 [TOMOYO_MAC_FILE_CREATE] = "file::create",
41 [TOMOYO_MAC_FILE_UNLINK] = "file::unlink",
42 [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir",
43 [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir",
44 [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo",
45 [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock",
46 [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate",
47 [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink",
48 [TOMOYO_MAC_FILE_REWRITE] = "file::rewrite",
49 [TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock",
50 [TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar",
51 [TOMOYO_MAC_FILE_LINK] = "file::link",
52 [TOMOYO_MAC_FILE_RENAME] = "file::rename",
53 [TOMOYO_MAC_FILE_CHMOD] = "file::chmod",
54 [TOMOYO_MAC_FILE_CHOWN] = "file::chown",
55 [TOMOYO_MAC_FILE_CHGRP] = "file::chgrp",
56 [TOMOYO_MAC_FILE_IOCTL] = "file::ioctl",
57 [TOMOYO_MAC_FILE_CHROOT] = "file::chroot",
58 [TOMOYO_MAC_FILE_MOUNT] = "file::mount",
59 [TOMOYO_MAC_FILE_UMOUNT] = "file::umount",
60 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
61 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
62 };
63
64 /* Permit policy management by non-root user? */
65 static bool tomoyo_manage_by_non_root;
66
67 /* Utility functions. */
68
69 /**
70 * tomoyo_yesno - Return "yes" or "no".
71 *
72 * @value: Bool value.
73 */
74 static const char *tomoyo_yesno(const unsigned int value)
75 {
76 return value ? "yes" : "no";
77 }
78
79 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
80 {
81 va_list args;
82 const int pos = strlen(buffer);
83 va_start(args, fmt);
84 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
85 va_end(args);
86 }
87
88 /**
89 * tomoyo_flush - Flush queued string to userspace's buffer.
90 *
91 * @head: Pointer to "struct tomoyo_io_buffer".
92 *
93 * Returns true if all data was flushed, false otherwise.
94 */
95 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
96 {
97 while (head->r.w_pos) {
98 const char *w = head->r.w[0];
99 int len = strlen(w);
100 if (len) {
101 if (len > head->read_user_buf_avail)
102 len = head->read_user_buf_avail;
103 if (!len)
104 return false;
105 if (copy_to_user(head->read_user_buf, w, len))
106 return false;
107 head->read_user_buf_avail -= len;
108 head->read_user_buf += len;
109 w += len;
110 }
111 if (*w) {
112 head->r.w[0] = w;
113 return false;
114 }
115 /* Add '\0' for query. */
116 if (head->poll) {
117 if (!head->read_user_buf_avail ||
118 copy_to_user(head->read_user_buf, "", 1))
119 return false;
120 head->read_user_buf_avail--;
121 head->read_user_buf++;
122 }
123 head->r.w_pos--;
124 for (len = 0; len < head->r.w_pos; len++)
125 head->r.w[len] = head->r.w[len + 1];
126 }
127 head->r.avail = 0;
128 return true;
129 }
130
131 /**
132 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
133 *
134 * @head: Pointer to "struct tomoyo_io_buffer".
135 * @string: String to print.
136 *
137 * Note that @string has to be kept valid until @head is kfree()d.
138 * This means that char[] allocated on stack memory cannot be passed to
139 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
140 */
141 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
142 {
143 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
144 head->r.w[head->r.w_pos++] = string;
145 tomoyo_flush(head);
146 } else
147 WARN_ON(1);
148 }
149
150 /**
151 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
152 *
153 * @head: Pointer to "struct tomoyo_io_buffer".
154 * @fmt: The printf()'s format string, followed by parameters.
155 */
156 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
157 {
158 va_list args;
159 int len;
160 int pos = head->r.avail;
161 int size = head->readbuf_size - pos;
162 if (size <= 0)
163 return;
164 va_start(args, fmt);
165 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
166 va_end(args);
167 if (pos + len >= head->readbuf_size) {
168 WARN_ON(1);
169 return;
170 }
171 head->r.avail += len;
172 tomoyo_set_string(head, head->read_buf + pos);
173 }
174
175 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
176 {
177 tomoyo_set_string(head, " ");
178 }
179
180 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
181 {
182 tomoyo_set_string(head, "\n");
183 return !head->r.w_pos;
184 }
185
186 /**
187 * tomoyo_print_name_union - Print a tomoyo_name_union.
188 *
189 * @head: Pointer to "struct tomoyo_io_buffer".
190 * @ptr: Pointer to "struct tomoyo_name_union".
191 */
192 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
193 const struct tomoyo_name_union *ptr)
194 {
195 tomoyo_set_space(head);
196 if (ptr->is_group) {
197 tomoyo_set_string(head, "@");
198 tomoyo_set_string(head, ptr->group->group_name->name);
199 } else {
200 tomoyo_set_string(head, ptr->filename->name);
201 }
202 }
203
204 /**
205 * tomoyo_print_number_union - Print a tomoyo_number_union.
206 *
207 * @head: Pointer to "struct tomoyo_io_buffer".
208 * @ptr: Pointer to "struct tomoyo_number_union".
209 */
210 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
211 const struct tomoyo_number_union *ptr)
212 {
213 tomoyo_set_space(head);
214 if (ptr->is_group) {
215 tomoyo_set_string(head, "@");
216 tomoyo_set_string(head, ptr->group->group_name->name);
217 } else {
218 int i;
219 unsigned long min = ptr->values[0];
220 const unsigned long max = ptr->values[1];
221 u8 min_type = ptr->min_type;
222 const u8 max_type = ptr->max_type;
223 char buffer[128];
224 buffer[0] = '\0';
225 for (i = 0; i < 2; i++) {
226 switch (min_type) {
227 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
228 tomoyo_addprintf(buffer, sizeof(buffer),
229 "0x%lX", min);
230 break;
231 case TOMOYO_VALUE_TYPE_OCTAL:
232 tomoyo_addprintf(buffer, sizeof(buffer),
233 "0%lo", min);
234 break;
235 default:
236 tomoyo_addprintf(buffer, sizeof(buffer),
237 "%lu", min);
238 break;
239 }
240 if (min == max && min_type == max_type)
241 break;
242 tomoyo_addprintf(buffer, sizeof(buffer), "-");
243 min_type = max_type;
244 min = max;
245 }
246 tomoyo_io_printf(head, "%s", buffer);
247 }
248 }
249
250 /**
251 * tomoyo_find_or_assign_new_profile - Create a new profile.
252 *
253 * @profile: Profile number to create.
254 *
255 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
256 */
257 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile
258 (const unsigned int profile)
259 {
260 struct tomoyo_profile *ptr;
261 struct tomoyo_profile *entry;
262 if (profile >= TOMOYO_MAX_PROFILES)
263 return NULL;
264 ptr = tomoyo_profile_ptr[profile];
265 if (ptr)
266 return ptr;
267 entry = kzalloc(sizeof(*entry), GFP_NOFS);
268 if (mutex_lock_interruptible(&tomoyo_policy_lock))
269 goto out;
270 ptr = tomoyo_profile_ptr[profile];
271 if (!ptr && tomoyo_memory_ok(entry)) {
272 ptr = entry;
273 ptr->learning = &tomoyo_default_profile.preference;
274 ptr->permissive = &tomoyo_default_profile.preference;
275 ptr->enforcing = &tomoyo_default_profile.preference;
276 ptr->default_config = TOMOYO_CONFIG_DISABLED;
277 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
278 sizeof(ptr->config));
279 mb(); /* Avoid out-of-order execution. */
280 tomoyo_profile_ptr[profile] = ptr;
281 entry = NULL;
282 }
283 mutex_unlock(&tomoyo_policy_lock);
284 out:
285 kfree(entry);
286 return ptr;
287 }
288
289 /**
290 * tomoyo_profile - Find a profile.
291 *
292 * @profile: Profile number to find.
293 *
294 * Returns pointer to "struct tomoyo_profile".
295 */
296 struct tomoyo_profile *tomoyo_profile(const u8 profile)
297 {
298 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
299 if (!tomoyo_policy_loaded)
300 return &tomoyo_default_profile;
301 BUG_ON(!ptr);
302 return ptr;
303 }
304
305 static s8 tomoyo_find_yesno(const char *string, const char *find)
306 {
307 const char *cp = strstr(string, find);
308 if (cp) {
309 cp += strlen(find);
310 if (!strncmp(cp, "=yes", 4))
311 return 1;
312 else if (!strncmp(cp, "=no", 3))
313 return 0;
314 }
315 return -1;
316 }
317
318 static void tomoyo_set_bool(bool *b, const char *string, const char *find)
319 {
320 switch (tomoyo_find_yesno(string, find)) {
321 case 1:
322 *b = true;
323 break;
324 case 0:
325 *b = false;
326 break;
327 }
328 }
329
330 static void tomoyo_set_uint(unsigned int *i, const char *string,
331 const char *find)
332 {
333 const char *cp = strstr(string, find);
334 if (cp)
335 sscanf(cp + strlen(find), "=%u", i);
336 }
337
338 static void tomoyo_set_pref(const char *name, const char *value,
339 const bool use_default,
340 struct tomoyo_profile *profile)
341 {
342 struct tomoyo_preference **pref;
343 bool *verbose;
344 if (!strcmp(name, "enforcing")) {
345 if (use_default) {
346 pref = &profile->enforcing;
347 goto set_default;
348 }
349 profile->enforcing = &profile->preference;
350 verbose = &profile->preference.enforcing_verbose;
351 goto set_verbose;
352 }
353 if (!strcmp(name, "permissive")) {
354 if (use_default) {
355 pref = &profile->permissive;
356 goto set_default;
357 }
358 profile->permissive = &profile->preference;
359 verbose = &profile->preference.permissive_verbose;
360 goto set_verbose;
361 }
362 if (!strcmp(name, "learning")) {
363 if (use_default) {
364 pref = &profile->learning;
365 goto set_default;
366 }
367 profile->learning = &profile->preference;
368 tomoyo_set_uint(&profile->preference.learning_max_entry, value,
369 "max_entry");
370 verbose = &profile->preference.learning_verbose;
371 goto set_verbose;
372 }
373 return;
374 set_default:
375 *pref = &tomoyo_default_profile.preference;
376 return;
377 set_verbose:
378 tomoyo_set_bool(verbose, value, "verbose");
379 }
380
381 static int tomoyo_set_mode(char *name, const char *value,
382 const bool use_default,
383 struct tomoyo_profile *profile)
384 {
385 u8 i;
386 u8 config;
387 if (!strcmp(name, "CONFIG")) {
388 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
389 config = profile->default_config;
390 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
391 config = 0;
392 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
393 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
394 if (strcmp(name, tomoyo_mac_keywords[i]))
395 continue;
396 config = profile->config[i];
397 break;
398 }
399 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
400 return -EINVAL;
401 } else {
402 return -EINVAL;
403 }
404 if (use_default) {
405 config = TOMOYO_CONFIG_USE_DEFAULT;
406 } else {
407 u8 mode;
408 for (mode = 0; mode < 4; mode++)
409 if (strstr(value, tomoyo_mode[mode]))
410 /*
411 * Update lower 3 bits in order to distinguish
412 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
413 */
414 config = (config & ~7) | mode;
415 }
416 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
417 profile->config[i] = config;
418 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
419 profile->default_config = config;
420 return 0;
421 }
422
423 /**
424 * tomoyo_write_profile - Write profile table.
425 *
426 * @head: Pointer to "struct tomoyo_io_buffer".
427 *
428 * Returns 0 on success, negative value otherwise.
429 */
430 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
431 {
432 char *data = head->write_buf;
433 unsigned int i;
434 bool use_default = false;
435 char *cp;
436 struct tomoyo_profile *profile;
437 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
438 return 0;
439 i = simple_strtoul(data, &cp, 10);
440 if (data == cp) {
441 profile = &tomoyo_default_profile;
442 } else {
443 if (*cp != '-')
444 return -EINVAL;
445 data = cp + 1;
446 profile = tomoyo_find_or_assign_new_profile(i);
447 if (!profile)
448 return -EINVAL;
449 }
450 cp = strchr(data, '=');
451 if (!cp)
452 return -EINVAL;
453 *cp++ = '\0';
454 if (profile != &tomoyo_default_profile)
455 use_default = strstr(cp, "use_default") != NULL;
456 if (tomoyo_str_starts(&data, "PREFERENCE::")) {
457 tomoyo_set_pref(data, cp, use_default, profile);
458 return 0;
459 }
460 if (profile == &tomoyo_default_profile)
461 return -EINVAL;
462 if (!strcmp(data, "COMMENT")) {
463 const struct tomoyo_path_info *old_comment = profile->comment;
464 profile->comment = tomoyo_get_name(cp);
465 tomoyo_put_name(old_comment);
466 return 0;
467 }
468 return tomoyo_set_mode(data, cp, use_default, profile);
469 }
470
471 static void tomoyo_print_preference(struct tomoyo_io_buffer *head,
472 const int idx)
473 {
474 struct tomoyo_preference *pref = &tomoyo_default_profile.preference;
475 const struct tomoyo_profile *profile = idx >= 0 ?
476 tomoyo_profile_ptr[idx] : NULL;
477 char buffer[16] = "";
478 if (profile) {
479 buffer[sizeof(buffer) - 1] = '\0';
480 snprintf(buffer, sizeof(buffer) - 1, "%u-", idx);
481 }
482 if (profile) {
483 pref = profile->learning;
484 if (pref == &tomoyo_default_profile.preference)
485 goto skip1;
486 }
487 tomoyo_io_printf(head, "%sPREFERENCE::%s={ "
488 "verbose=%s max_entry=%u }\n",
489 buffer, "learning",
490 tomoyo_yesno(pref->learning_verbose),
491 pref->learning_max_entry);
492 skip1:
493 if (profile) {
494 pref = profile->permissive;
495 if (pref == &tomoyo_default_profile.preference)
496 goto skip2;
497 }
498 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
499 buffer, "permissive",
500 tomoyo_yesno(pref->permissive_verbose));
501 skip2:
502 if (profile) {
503 pref = profile->enforcing;
504 if (pref == &tomoyo_default_profile.preference)
505 return;
506 }
507 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
508 buffer, "enforcing",
509 tomoyo_yesno(pref->enforcing_verbose));
510 }
511
512 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
513 {
514 tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]);
515 }
516
517 /**
518 * tomoyo_read_profile - Read profile table.
519 *
520 * @head: Pointer to "struct tomoyo_io_buffer".
521 */
522 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
523 {
524 u8 index;
525 const struct tomoyo_profile *profile;
526 next:
527 index = head->r.index;
528 profile = tomoyo_profile_ptr[index];
529 switch (head->r.step) {
530 case 0:
531 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
532 tomoyo_print_preference(head, -1);
533 head->r.step++;
534 break;
535 case 1:
536 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
537 head->r.index++)
538 if (tomoyo_profile_ptr[head->r.index])
539 break;
540 if (head->r.index == TOMOYO_MAX_PROFILES)
541 return;
542 head->r.step++;
543 break;
544 case 2:
545 {
546 const struct tomoyo_path_info *comment =
547 profile->comment;
548 tomoyo_io_printf(head, "%u-COMMENT=", index);
549 tomoyo_set_string(head, comment ? comment->name : "");
550 tomoyo_set_lf(head);
551 head->r.step++;
552 }
553 break;
554 case 3:
555 {
556 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
557 tomoyo_print_config(head, profile->default_config);
558 head->r.bit = 0;
559 head->r.step++;
560 }
561 break;
562 case 4:
563 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
564 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
565 const u8 i = head->r.bit;
566 const u8 config = profile->config[i];
567 if (config == TOMOYO_CONFIG_USE_DEFAULT)
568 continue;
569 tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
570 tomoyo_mac_keywords[i]);
571 tomoyo_print_config(head, config);
572 head->r.bit++;
573 break;
574 }
575 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
576 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
577 tomoyo_print_preference(head, index);
578 head->r.index++;
579 head->r.step = 1;
580 }
581 break;
582 }
583 if (tomoyo_flush(head))
584 goto next;
585 }
586
587 static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a,
588 const struct tomoyo_acl_head *b)
589 {
590 return container_of(a, struct tomoyo_policy_manager_entry, head)
591 ->manager ==
592 container_of(b, struct tomoyo_policy_manager_entry, head)
593 ->manager;
594 }
595
596 /**
597 * tomoyo_update_manager_entry - Add a manager entry.
598 *
599 * @manager: The path to manager or the domainnamme.
600 * @is_delete: True if it is a delete request.
601 *
602 * Returns 0 on success, negative value otherwise.
603 *
604 * Caller holds tomoyo_read_lock().
605 */
606 static int tomoyo_update_manager_entry(const char *manager,
607 const bool is_delete)
608 {
609 struct tomoyo_policy_manager_entry e = { };
610 int error;
611
612 if (tomoyo_domain_def(manager)) {
613 if (!tomoyo_correct_domain(manager))
614 return -EINVAL;
615 e.is_domain = true;
616 } else {
617 if (!tomoyo_correct_path(manager))
618 return -EINVAL;
619 }
620 e.manager = tomoyo_get_name(manager);
621 if (!e.manager)
622 return -ENOMEM;
623 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
624 &tomoyo_policy_list[TOMOYO_ID_MANAGER],
625 tomoyo_same_manager_entry);
626 tomoyo_put_name(e.manager);
627 return error;
628 }
629
630 /**
631 * tomoyo_write_manager_policy - Write manager policy.
632 *
633 * @head: Pointer to "struct tomoyo_io_buffer".
634 *
635 * Returns 0 on success, negative value otherwise.
636 *
637 * Caller holds tomoyo_read_lock().
638 */
639 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
640 {
641 char *data = head->write_buf;
642 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
643
644 if (!strcmp(data, "manage_by_non_root")) {
645 tomoyo_manage_by_non_root = !is_delete;
646 return 0;
647 }
648 return tomoyo_update_manager_entry(data, is_delete);
649 }
650
651 /**
652 * tomoyo_read_manager_policy - Read manager policy.
653 *
654 * @head: Pointer to "struct tomoyo_io_buffer".
655 *
656 * Caller holds tomoyo_read_lock().
657 */
658 static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
659 {
660 if (head->r.eof)
661 return;
662 list_for_each_cookie(head->r.acl,
663 &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
664 struct tomoyo_policy_manager_entry *ptr =
665 list_entry(head->r.acl, typeof(*ptr), head.list);
666 if (ptr->head.is_deleted)
667 continue;
668 if (!tomoyo_flush(head))
669 return;
670 tomoyo_set_string(head, ptr->manager->name);
671 tomoyo_set_lf(head);
672 }
673 head->r.eof = true;
674 }
675
676 /**
677 * tomoyo_policy_manager - Check whether the current process is a policy manager.
678 *
679 * Returns true if the current process is permitted to modify policy
680 * via /sys/kernel/security/tomoyo/ interface.
681 *
682 * Caller holds tomoyo_read_lock().
683 */
684 static bool tomoyo_policy_manager(void)
685 {
686 struct tomoyo_policy_manager_entry *ptr;
687 const char *exe;
688 const struct task_struct *task = current;
689 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
690 bool found = false;
691
692 if (!tomoyo_policy_loaded)
693 return true;
694 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
695 return false;
696 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
697 head.list) {
698 if (!ptr->head.is_deleted && ptr->is_domain
699 && !tomoyo_pathcmp(domainname, ptr->manager)) {
700 found = true;
701 break;
702 }
703 }
704 if (found)
705 return true;
706 exe = tomoyo_get_exe();
707 if (!exe)
708 return false;
709 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
710 head.list) {
711 if (!ptr->head.is_deleted && !ptr->is_domain
712 && !strcmp(exe, ptr->manager->name)) {
713 found = true;
714 break;
715 }
716 }
717 if (!found) { /* Reduce error messages. */
718 static pid_t last_pid;
719 const pid_t pid = current->pid;
720 if (last_pid != pid) {
721 printk(KERN_WARNING "%s ( %s ) is not permitted to "
722 "update policies.\n", domainname->name, exe);
723 last_pid = pid;
724 }
725 }
726 kfree(exe);
727 return found;
728 }
729
730 /**
731 * tomoyo_select_one - Parse select command.
732 *
733 * @head: Pointer to "struct tomoyo_io_buffer".
734 * @data: String to parse.
735 *
736 * Returns true on success, false otherwise.
737 *
738 * Caller holds tomoyo_read_lock().
739 */
740 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
741 {
742 unsigned int pid;
743 struct tomoyo_domain_info *domain = NULL;
744 bool global_pid = false;
745
746 if (!strcmp(data, "allow_execute")) {
747 head->r.print_execute_only = true;
748 return true;
749 }
750 if (sscanf(data, "pid=%u", &pid) == 1 ||
751 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
752 struct task_struct *p;
753 rcu_read_lock();
754 read_lock(&tasklist_lock);
755 if (global_pid)
756 p = find_task_by_pid_ns(pid, &init_pid_ns);
757 else
758 p = find_task_by_vpid(pid);
759 if (p)
760 domain = tomoyo_real_domain(p);
761 read_unlock(&tasklist_lock);
762 rcu_read_unlock();
763 } else if (!strncmp(data, "domain=", 7)) {
764 if (tomoyo_domain_def(data + 7))
765 domain = tomoyo_find_domain(data + 7);
766 } else
767 return false;
768 head->write_var1 = domain;
769 /* Accessing read_buf is safe because head->io_sem is held. */
770 if (!head->read_buf)
771 return true; /* Do nothing if open(O_WRONLY). */
772 memset(&head->r, 0, sizeof(head->r));
773 head->r.print_this_domain_only = true;
774 head->r.eof = !domain;
775 head->r.domain = &domain->list;
776 tomoyo_io_printf(head, "# select %s\n", data);
777 if (domain && domain->is_deleted)
778 tomoyo_io_printf(head, "# This is a deleted domain.\n");
779 return true;
780 }
781
782 /**
783 * tomoyo_delete_domain - Delete a domain.
784 *
785 * @domainname: The name of domain.
786 *
787 * Returns 0.
788 *
789 * Caller holds tomoyo_read_lock().
790 */
791 static int tomoyo_delete_domain(char *domainname)
792 {
793 struct tomoyo_domain_info *domain;
794 struct tomoyo_path_info name;
795
796 name.name = domainname;
797 tomoyo_fill_path_info(&name);
798 if (mutex_lock_interruptible(&tomoyo_policy_lock))
799 return 0;
800 /* Is there an active domain? */
801 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
802 /* Never delete tomoyo_kernel_domain */
803 if (domain == &tomoyo_kernel_domain)
804 continue;
805 if (domain->is_deleted ||
806 tomoyo_pathcmp(domain->domainname, &name))
807 continue;
808 domain->is_deleted = true;
809 break;
810 }
811 mutex_unlock(&tomoyo_policy_lock);
812 return 0;
813 }
814
815 /**
816 * tomoyo_write_domain_policy2 - Write domain policy.
817 *
818 * @head: Pointer to "struct tomoyo_io_buffer".
819 *
820 * Returns 0 on success, negative value otherwise.
821 *
822 * Caller holds tomoyo_read_lock().
823 */
824 static int tomoyo_write_domain_policy2(char *data,
825 struct tomoyo_domain_info *domain,
826 const bool is_delete)
827 {
828 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
829 return tomoyo_write_mount_policy(data, domain, is_delete);
830 return tomoyo_write_file_policy(data, domain, is_delete);
831 }
832
833 /**
834 * tomoyo_write_domain_policy - Write domain policy.
835 *
836 * @head: Pointer to "struct tomoyo_io_buffer".
837 *
838 * Returns 0 on success, negative value otherwise.
839 *
840 * Caller holds tomoyo_read_lock().
841 */
842 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
843 {
844 char *data = head->write_buf;
845 struct tomoyo_domain_info *domain = head->write_var1;
846 bool is_delete = false;
847 bool is_select = false;
848 unsigned int profile;
849
850 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
851 is_delete = true;
852 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
853 is_select = true;
854 if (is_select && tomoyo_select_one(head, data))
855 return 0;
856 /* Don't allow updating policies by non manager programs. */
857 if (!tomoyo_policy_manager())
858 return -EPERM;
859 if (tomoyo_domain_def(data)) {
860 domain = NULL;
861 if (is_delete)
862 tomoyo_delete_domain(data);
863 else if (is_select)
864 domain = tomoyo_find_domain(data);
865 else
866 domain = tomoyo_find_or_assign_new_domain(data, 0);
867 head->write_var1 = domain;
868 return 0;
869 }
870 if (!domain)
871 return -EINVAL;
872
873 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
874 && profile < TOMOYO_MAX_PROFILES) {
875 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
876 domain->profile = (u8) profile;
877 return 0;
878 }
879 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
880 domain->ignore_global_allow_read = !is_delete;
881 return 0;
882 }
883 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
884 domain->quota_warned = !is_delete;
885 return 0;
886 }
887 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
888 domain->transition_failed = !is_delete;
889 return 0;
890 }
891 return tomoyo_write_domain_policy2(data, domain, is_delete);
892 }
893
894 /**
895 * tomoyo_fns - Find next set bit.
896 *
897 * @perm: 8 bits value.
898 * @bit: First bit to find.
899 *
900 * Returns next on-bit on success, 8 otherwise.
901 */
902 static u8 tomoyo_fns(const u8 perm, u8 bit)
903 {
904 for ( ; bit < 8; bit++)
905 if (perm & (1 << bit))
906 break;
907 return bit;
908 }
909
910 /**
911 * tomoyo_print_entry - Print an ACL entry.
912 *
913 * @head: Pointer to "struct tomoyo_io_buffer".
914 * @acl: Pointer to an ACL entry.
915 *
916 * Returns true on success, false otherwise.
917 */
918 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
919 struct tomoyo_acl_info *acl)
920 {
921 const u8 acl_type = acl->type;
922 u8 bit;
923
924 if (acl->is_deleted)
925 return true;
926 next:
927 bit = head->r.bit;
928 if (!tomoyo_flush(head))
929 return false;
930 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
931 struct tomoyo_path_acl *ptr =
932 container_of(acl, typeof(*ptr), head);
933 const u16 perm = ptr->perm;
934 for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
935 if (!(perm & (1 << bit)))
936 continue;
937 if (head->r.print_execute_only &&
938 bit != TOMOYO_TYPE_EXECUTE)
939 continue;
940 /* Print "read/write" instead of "read" and "write". */
941 if ((bit == TOMOYO_TYPE_READ ||
942 bit == TOMOYO_TYPE_WRITE)
943 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
944 continue;
945 break;
946 }
947 if (bit >= TOMOYO_MAX_PATH_OPERATION)
948 goto done;
949 tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]);
950 tomoyo_print_name_union(head, &ptr->name);
951 } else if (head->r.print_execute_only) {
952 return true;
953 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
954 struct tomoyo_path2_acl *ptr =
955 container_of(acl, typeof(*ptr), head);
956 bit = tomoyo_fns(ptr->perm, bit);
957 if (bit >= TOMOYO_MAX_PATH2_OPERATION)
958 goto done;
959 tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]);
960 tomoyo_print_name_union(head, &ptr->name1);
961 tomoyo_print_name_union(head, &ptr->name2);
962 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
963 struct tomoyo_path_number_acl *ptr =
964 container_of(acl, typeof(*ptr), head);
965 bit = tomoyo_fns(ptr->perm, bit);
966 if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION)
967 goto done;
968 tomoyo_io_printf(head, "allow_%s",
969 tomoyo_path_number_keyword[bit]);
970 tomoyo_print_name_union(head, &ptr->name);
971 tomoyo_print_number_union(head, &ptr->number);
972 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
973 struct tomoyo_mkdev_acl *ptr =
974 container_of(acl, typeof(*ptr), head);
975 bit = tomoyo_fns(ptr->perm, bit);
976 if (bit >= TOMOYO_MAX_MKDEV_OPERATION)
977 goto done;
978 tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]);
979 tomoyo_print_name_union(head, &ptr->name);
980 tomoyo_print_number_union(head, &ptr->mode);
981 tomoyo_print_number_union(head, &ptr->major);
982 tomoyo_print_number_union(head, &ptr->minor);
983 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
984 struct tomoyo_mount_acl *ptr =
985 container_of(acl, typeof(*ptr), head);
986 tomoyo_io_printf(head, "allow_mount");
987 tomoyo_print_name_union(head, &ptr->dev_name);
988 tomoyo_print_name_union(head, &ptr->dir_name);
989 tomoyo_print_name_union(head, &ptr->fs_type);
990 tomoyo_print_number_union(head, &ptr->flags);
991 }
992 head->r.bit = bit + 1;
993 tomoyo_io_printf(head, "\n");
994 if (acl_type != TOMOYO_TYPE_MOUNT_ACL)
995 goto next;
996 done:
997 head->r.bit = 0;
998 return true;
999 }
1000
1001 /**
1002 * tomoyo_read_domain2 - Read domain policy.
1003 *
1004 * @head: Pointer to "struct tomoyo_io_buffer".
1005 * @domain: Pointer to "struct tomoyo_domain_info".
1006 *
1007 * Caller holds tomoyo_read_lock().
1008 *
1009 * Returns true on success, false otherwise.
1010 */
1011 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1012 struct tomoyo_domain_info *domain)
1013 {
1014 list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
1015 struct tomoyo_acl_info *ptr =
1016 list_entry(head->r.acl, typeof(*ptr), list);
1017 if (!tomoyo_print_entry(head, ptr))
1018 return false;
1019 }
1020 head->r.acl = NULL;
1021 return true;
1022 }
1023
1024 /**
1025 * tomoyo_read_domain_policy - Read domain policy.
1026 *
1027 * @head: Pointer to "struct tomoyo_io_buffer".
1028 *
1029 * Caller holds tomoyo_read_lock().
1030 */
1031 static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1032 {
1033 if (head->r.eof)
1034 return;
1035 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1036 struct tomoyo_domain_info *domain =
1037 list_entry(head->r.domain, typeof(*domain), list);
1038 switch (head->r.step) {
1039 case 0:
1040 if (domain->is_deleted &&
1041 !head->r.print_this_domain_only)
1042 continue;
1043 /* Print domainname and flags. */
1044 tomoyo_set_string(head, domain->domainname->name);
1045 tomoyo_set_lf(head);
1046 tomoyo_io_printf(head,
1047 TOMOYO_KEYWORD_USE_PROFILE "%u\n",
1048 domain->profile);
1049 if (domain->quota_warned)
1050 tomoyo_set_string(head, "quota_exceeded\n");
1051 if (domain->transition_failed)
1052 tomoyo_set_string(head, "transition_failed\n");
1053 if (domain->ignore_global_allow_read)
1054 tomoyo_set_string(head,
1055 TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ
1056 "\n");
1057 head->r.step++;
1058 tomoyo_set_lf(head);
1059 /* fall through */
1060 case 1:
1061 if (!tomoyo_read_domain2(head, domain))
1062 return;
1063 head->r.step++;
1064 if (!tomoyo_set_lf(head))
1065 return;
1066 /* fall through */
1067 case 2:
1068 head->r.step = 0;
1069 if (head->r.print_this_domain_only)
1070 goto done;
1071 }
1072 }
1073 done:
1074 head->r.eof = true;
1075 }
1076
1077 /**
1078 * tomoyo_write_domain_profile - Assign profile for specified domain.
1079 *
1080 * @head: Pointer to "struct tomoyo_io_buffer".
1081 *
1082 * Returns 0 on success, -EINVAL otherwise.
1083 *
1084 * This is equivalent to doing
1085 *
1086 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1087 * /usr/sbin/tomoyo-loadpolicy -d
1088 *
1089 * Caller holds tomoyo_read_lock().
1090 */
1091 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1092 {
1093 char *data = head->write_buf;
1094 char *cp = strchr(data, ' ');
1095 struct tomoyo_domain_info *domain;
1096 unsigned long profile;
1097
1098 if (!cp)
1099 return -EINVAL;
1100 *cp = '\0';
1101 domain = tomoyo_find_domain(cp + 1);
1102 if (strict_strtoul(data, 10, &profile))
1103 return -EINVAL;
1104 if (domain && profile < TOMOYO_MAX_PROFILES
1105 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1106 domain->profile = (u8) profile;
1107 return 0;
1108 }
1109
1110 /**
1111 * tomoyo_read_domain_profile - Read only domainname and profile.
1112 *
1113 * @head: Pointer to "struct tomoyo_io_buffer".
1114 *
1115 * Returns list of profile number and domainname pairs.
1116 *
1117 * This is equivalent to doing
1118 *
1119 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1120 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1121 * domainname = $0; } else if ( $1 == "use_profile" ) {
1122 * print $2 " " domainname; domainname = ""; } } ; '
1123 *
1124 * Caller holds tomoyo_read_lock().
1125 */
1126 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1127 {
1128 if (head->r.eof)
1129 return;
1130 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1131 struct tomoyo_domain_info *domain =
1132 list_entry(head->r.domain, typeof(*domain), list);
1133 if (domain->is_deleted)
1134 continue;
1135 if (!tomoyo_flush(head))
1136 return;
1137 tomoyo_io_printf(head, "%u ", domain->profile);
1138 tomoyo_set_string(head, domain->domainname->name);
1139 tomoyo_set_lf(head);
1140 }
1141 head->r.eof = true;
1142 }
1143
1144 /**
1145 * tomoyo_write_pid: Specify PID to obtain domainname.
1146 *
1147 * @head: Pointer to "struct tomoyo_io_buffer".
1148 *
1149 * Returns 0.
1150 */
1151 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1152 {
1153 head->r.eof = false;
1154 return 0;
1155 }
1156
1157 /**
1158 * tomoyo_read_pid - Get domainname of the specified PID.
1159 *
1160 * @head: Pointer to "struct tomoyo_io_buffer".
1161 *
1162 * Returns the domainname which the specified PID is in on success,
1163 * empty string otherwise.
1164 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1165 * using read()/write() interface rather than sysctl() interface.
1166 */
1167 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1168 {
1169 char *buf = head->write_buf;
1170 bool global_pid = false;
1171 unsigned int pid;
1172 struct task_struct *p;
1173 struct tomoyo_domain_info *domain = NULL;
1174
1175 /* Accessing write_buf is safe because head->io_sem is held. */
1176 if (!buf) {
1177 head->r.eof = true;
1178 return; /* Do nothing if open(O_RDONLY). */
1179 }
1180 if (head->r.w_pos || head->r.eof)
1181 return;
1182 head->r.eof = true;
1183 if (tomoyo_str_starts(&buf, "global-pid "))
1184 global_pid = true;
1185 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1186 rcu_read_lock();
1187 read_lock(&tasklist_lock);
1188 if (global_pid)
1189 p = find_task_by_pid_ns(pid, &init_pid_ns);
1190 else
1191 p = find_task_by_vpid(pid);
1192 if (p)
1193 domain = tomoyo_real_domain(p);
1194 read_unlock(&tasklist_lock);
1195 rcu_read_unlock();
1196 if (!domain)
1197 return;
1198 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1199 tomoyo_set_string(head, domain->domainname->name);
1200 }
1201
1202 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1203 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE]
1204 = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN,
1205 [TOMOYO_TRANSITION_CONTROL_INITIALIZE]
1206 = TOMOYO_KEYWORD_INITIALIZE_DOMAIN,
1207 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN,
1208 [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN
1209 };
1210
1211 /**
1212 * tomoyo_write_exception_policy - Write exception policy.
1213 *
1214 * @head: Pointer to "struct tomoyo_io_buffer".
1215 *
1216 * Returns 0 on success, negative value otherwise.
1217 *
1218 * Caller holds tomoyo_read_lock().
1219 */
1220 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1221 {
1222 char *data = head->write_buf;
1223 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1224 u8 i;
1225
1226 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) {
1227 if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
1228 return tomoyo_write_transition_control(data, is_delete,
1229 i);
1230 }
1231 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1232 return tomoyo_write_aggregator_policy(data, is_delete);
1233 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1234 return tomoyo_write_globally_readable_policy(data, is_delete);
1235 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1236 return tomoyo_write_pattern_policy(data, is_delete);
1237 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1238 return tomoyo_write_no_rewrite_policy(data, is_delete);
1239 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1240 return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP);
1241 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1242 return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP);
1243 return -EINVAL;
1244 }
1245
1246 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1247 [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP,
1248 [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP
1249 };
1250
1251 /**
1252 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1253 *
1254 * @head: Pointer to "struct tomoyo_io_buffer".
1255 * @idx: Index number.
1256 *
1257 * Returns true on success, false otherwise.
1258 *
1259 * Caller holds tomoyo_read_lock().
1260 */
1261 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1262 {
1263 list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1264 struct tomoyo_group *group =
1265 list_entry(head->r.group, typeof(*group), list);
1266 list_for_each_cookie(head->r.acl, &group->member_list) {
1267 struct tomoyo_acl_head *ptr =
1268 list_entry(head->r.acl, typeof(*ptr), list);
1269 if (ptr->is_deleted)
1270 continue;
1271 if (!tomoyo_flush(head))
1272 return false;
1273 tomoyo_set_string(head, tomoyo_group_name[idx]);
1274 tomoyo_set_string(head, group->group_name->name);
1275 if (idx == TOMOYO_PATH_GROUP) {
1276 tomoyo_set_space(head);
1277 tomoyo_set_string(head, container_of
1278 (ptr, struct tomoyo_path_group,
1279 head)->member_name->name);
1280 } else if (idx == TOMOYO_NUMBER_GROUP) {
1281 tomoyo_print_number_union(head, &container_of
1282 (ptr,
1283 struct tomoyo_number_group,
1284 head)->number);
1285 }
1286 tomoyo_set_lf(head);
1287 }
1288 head->r.acl = NULL;
1289 }
1290 head->r.group = NULL;
1291 return true;
1292 }
1293
1294 /**
1295 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1296 *
1297 * @head: Pointer to "struct tomoyo_io_buffer".
1298 * @idx: Index number.
1299 *
1300 * Returns true on success, false otherwise.
1301 *
1302 * Caller holds tomoyo_read_lock().
1303 */
1304 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1305 {
1306 list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1307 struct tomoyo_acl_head *acl =
1308 container_of(head->r.acl, typeof(*acl), list);
1309 if (acl->is_deleted)
1310 continue;
1311 if (!tomoyo_flush(head))
1312 return false;
1313 switch (idx) {
1314 case TOMOYO_ID_TRANSITION_CONTROL:
1315 {
1316 struct tomoyo_transition_control *ptr =
1317 container_of(acl, typeof(*ptr), head);
1318 tomoyo_set_string(head,
1319 tomoyo_transition_type
1320 [ptr->type]);
1321 if (ptr->program)
1322 tomoyo_set_string(head,
1323 ptr->program->name);
1324 if (ptr->program && ptr->domainname)
1325 tomoyo_set_string(head, " from ");
1326 if (ptr->domainname)
1327 tomoyo_set_string(head,
1328 ptr->domainname->
1329 name);
1330 }
1331 break;
1332 case TOMOYO_ID_GLOBALLY_READABLE:
1333 {
1334 struct tomoyo_globally_readable_file_entry *ptr
1335 = container_of(acl, typeof(*ptr), head);
1336 tomoyo_set_string(head,
1337 TOMOYO_KEYWORD_ALLOW_READ);
1338 tomoyo_set_string(head, ptr->filename->name);
1339 }
1340 break;
1341 case TOMOYO_ID_AGGREGATOR:
1342 {
1343 struct tomoyo_aggregator_entry *ptr =
1344 container_of(acl, typeof(*ptr), head);
1345 tomoyo_set_string(head,
1346 TOMOYO_KEYWORD_AGGREGATOR);
1347 tomoyo_set_string(head,
1348 ptr->original_name->name);
1349 tomoyo_set_space(head);
1350 tomoyo_set_string(head,
1351 ptr->aggregated_name->name);
1352 }
1353 break;
1354 case TOMOYO_ID_PATTERN:
1355 {
1356 struct tomoyo_pattern_entry *ptr =
1357 container_of(acl, typeof(*ptr), head);
1358 tomoyo_set_string(head,
1359 TOMOYO_KEYWORD_FILE_PATTERN);
1360 tomoyo_set_string(head, ptr->pattern->name);
1361 }
1362 break;
1363 case TOMOYO_ID_NO_REWRITE:
1364 {
1365 struct tomoyo_no_rewrite_entry *ptr =
1366 container_of(acl, typeof(*ptr), head);
1367 tomoyo_set_string(head,
1368 TOMOYO_KEYWORD_DENY_REWRITE);
1369 tomoyo_set_string(head, ptr->pattern->name);
1370 }
1371 break;
1372 default:
1373 continue;
1374 }
1375 tomoyo_set_lf(head);
1376 }
1377 head->r.acl = NULL;
1378 return true;
1379 }
1380
1381 /**
1382 * tomoyo_read_exception_policy - Read exception policy.
1383 *
1384 * @head: Pointer to "struct tomoyo_io_buffer".
1385 *
1386 * Caller holds tomoyo_read_lock().
1387 */
1388 static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1389 {
1390 if (head->r.eof)
1391 return;
1392 while (head->r.step < TOMOYO_MAX_POLICY &&
1393 tomoyo_read_policy(head, head->r.step))
1394 head->r.step++;
1395 if (head->r.step < TOMOYO_MAX_POLICY)
1396 return;
1397 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1398 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1399 head->r.step++;
1400 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1401 return;
1402 head->r.eof = true;
1403 }
1404
1405 /**
1406 * tomoyo_print_header - Get header line of audit log.
1407 *
1408 * @r: Pointer to "struct tomoyo_request_info".
1409 *
1410 * Returns string representation.
1411 *
1412 * This function uses kmalloc(), so caller must kfree() if this function
1413 * didn't return NULL.
1414 */
1415 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1416 {
1417 struct timeval tv;
1418 const pid_t gpid = task_pid_nr(current);
1419 static const int tomoyo_buffer_len = 4096;
1420 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1421 if (!buffer)
1422 return NULL;
1423 do_gettimeofday(&tv);
1424 snprintf(buffer, tomoyo_buffer_len - 1,
1425 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1426 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1427 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1428 tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid,
1429 (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1430 current_uid(), current_gid(), current_euid(),
1431 current_egid(), current_suid(), current_sgid(),
1432 current_fsuid(), current_fsgid());
1433 return buffer;
1434 }
1435
1436 /**
1437 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1438 *
1439 * @len: Required size.
1440 * @r: Pointer to "struct tomoyo_request_info".
1441 *
1442 * Returns pointer to allocated memory.
1443 *
1444 * The @len is updated to add the header lines' size on success.
1445 *
1446 * This function uses kzalloc(), so caller must kfree() if this function
1447 * didn't return NULL.
1448 */
1449 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1450 {
1451 char *buf = NULL;
1452 const char *header;
1453 const char *domainname;
1454 if (!r->domain)
1455 r->domain = tomoyo_domain();
1456 domainname = r->domain->domainname->name;
1457 header = tomoyo_print_header(r);
1458 if (!header)
1459 return NULL;
1460 *len += strlen(domainname) + strlen(header) + 10;
1461 buf = kzalloc(*len, GFP_NOFS);
1462 if (buf)
1463 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1464 kfree(header);
1465 return buf;
1466 }
1467
1468 /* Wait queue for tomoyo_query_list. */
1469 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1470
1471 /* Lock for manipulating tomoyo_query_list. */
1472 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1473
1474 /* Structure for query. */
1475 struct tomoyo_query_entry {
1476 struct list_head list;
1477 char *query;
1478 int query_len;
1479 unsigned int serial;
1480 int timer;
1481 int answer;
1482 };
1483
1484 /* The list for "struct tomoyo_query_entry". */
1485 static LIST_HEAD(tomoyo_query_list);
1486
1487 /*
1488 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1489 * interface.
1490 */
1491 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1492
1493 /**
1494 * tomoyo_supervisor - Ask for the supervisor's decision.
1495 *
1496 * @r: Pointer to "struct tomoyo_request_info".
1497 * @fmt: The printf()'s format string, followed by parameters.
1498 *
1499 * Returns 0 if the supervisor decided to permit the access request which
1500 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1501 * supervisor decided to retry the access request which violated the policy in
1502 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1503 */
1504 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1505 {
1506 va_list args;
1507 int error = -EPERM;
1508 int pos;
1509 int len;
1510 static unsigned int tomoyo_serial;
1511 struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1512 bool quota_exceeded = false;
1513 char *header;
1514 switch (r->mode) {
1515 char *buffer;
1516 case TOMOYO_CONFIG_LEARNING:
1517 if (!tomoyo_domain_quota_is_ok(r))
1518 return 0;
1519 va_start(args, fmt);
1520 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1521 va_end(args);
1522 buffer = kmalloc(len, GFP_NOFS);
1523 if (!buffer)
1524 return 0;
1525 va_start(args, fmt);
1526 vsnprintf(buffer, len - 1, fmt, args);
1527 va_end(args);
1528 tomoyo_normalize_line(buffer);
1529 tomoyo_write_domain_policy2(buffer, r->domain, false);
1530 kfree(buffer);
1531 /* fall through */
1532 case TOMOYO_CONFIG_PERMISSIVE:
1533 return 0;
1534 }
1535 if (!r->domain)
1536 r->domain = tomoyo_domain();
1537 if (!atomic_read(&tomoyo_query_observers))
1538 return -EPERM;
1539 va_start(args, fmt);
1540 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1541 va_end(args);
1542 header = tomoyo_init_audit_log(&len, r);
1543 if (!header)
1544 goto out;
1545 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1546 if (!tomoyo_query_entry)
1547 goto out;
1548 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1549 if (!tomoyo_query_entry->query)
1550 goto out;
1551 len = ksize(tomoyo_query_entry->query);
1552 INIT_LIST_HEAD(&tomoyo_query_entry->list);
1553 spin_lock(&tomoyo_query_list_lock);
1554 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1555 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1556 quota_exceeded = true;
1557 } else {
1558 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1559 tomoyo_query_entry->serial = tomoyo_serial++;
1560 }
1561 spin_unlock(&tomoyo_query_list_lock);
1562 if (quota_exceeded)
1563 goto out;
1564 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1565 tomoyo_query_entry->serial, r->retry, header);
1566 kfree(header);
1567 header = NULL;
1568 va_start(args, fmt);
1569 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1570 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1571 va_end(args);
1572 spin_lock(&tomoyo_query_list_lock);
1573 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1574 spin_unlock(&tomoyo_query_list_lock);
1575 /* Give 10 seconds for supervisor's opinion. */
1576 for (tomoyo_query_entry->timer = 0;
1577 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1578 tomoyo_query_entry->timer++) {
1579 wake_up(&tomoyo_query_wait);
1580 set_current_state(TASK_INTERRUPTIBLE);
1581 schedule_timeout(HZ / 10);
1582 if (tomoyo_query_entry->answer)
1583 break;
1584 }
1585 spin_lock(&tomoyo_query_list_lock);
1586 list_del(&tomoyo_query_entry->list);
1587 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1588 spin_unlock(&tomoyo_query_list_lock);
1589 switch (tomoyo_query_entry->answer) {
1590 case 3: /* Asked to retry by administrator. */
1591 error = TOMOYO_RETRY_REQUEST;
1592 r->retry++;
1593 break;
1594 case 1:
1595 /* Granted by administrator. */
1596 error = 0;
1597 break;
1598 case 0:
1599 /* Timed out. */
1600 break;
1601 default:
1602 /* Rejected by administrator. */
1603 break;
1604 }
1605 out:
1606 if (tomoyo_query_entry)
1607 kfree(tomoyo_query_entry->query);
1608 kfree(tomoyo_query_entry);
1609 kfree(header);
1610 return error;
1611 }
1612
1613 /**
1614 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1615 *
1616 * @file: Pointer to "struct file".
1617 * @wait: Pointer to "poll_table".
1618 *
1619 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1620 *
1621 * Waits for access requests which violated policy in enforcing mode.
1622 */
1623 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1624 {
1625 struct list_head *tmp;
1626 bool found = false;
1627 u8 i;
1628 for (i = 0; i < 2; i++) {
1629 spin_lock(&tomoyo_query_list_lock);
1630 list_for_each(tmp, &tomoyo_query_list) {
1631 struct tomoyo_query_entry *ptr
1632 = list_entry(tmp, struct tomoyo_query_entry,
1633 list);
1634 if (ptr->answer)
1635 continue;
1636 found = true;
1637 break;
1638 }
1639 spin_unlock(&tomoyo_query_list_lock);
1640 if (found)
1641 return POLLIN | POLLRDNORM;
1642 if (i)
1643 break;
1644 poll_wait(file, &tomoyo_query_wait, wait);
1645 }
1646 return 0;
1647 }
1648
1649 /**
1650 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1651 *
1652 * @head: Pointer to "struct tomoyo_io_buffer".
1653 */
1654 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1655 {
1656 struct list_head *tmp;
1657 int pos = 0;
1658 int len = 0;
1659 char *buf;
1660 if (head->r.w_pos)
1661 return;
1662 if (head->read_buf) {
1663 kfree(head->read_buf);
1664 head->read_buf = NULL;
1665 }
1666 spin_lock(&tomoyo_query_list_lock);
1667 list_for_each(tmp, &tomoyo_query_list) {
1668 struct tomoyo_query_entry *ptr =
1669 list_entry(tmp, typeof(*ptr), list);
1670 if (ptr->answer)
1671 continue;
1672 if (pos++ != head->r.query_index)
1673 continue;
1674 len = ptr->query_len;
1675 break;
1676 }
1677 spin_unlock(&tomoyo_query_list_lock);
1678 if (!len) {
1679 head->r.query_index = 0;
1680 return;
1681 }
1682 buf = kzalloc(len, GFP_NOFS);
1683 if (!buf)
1684 return;
1685 pos = 0;
1686 spin_lock(&tomoyo_query_list_lock);
1687 list_for_each(tmp, &tomoyo_query_list) {
1688 struct tomoyo_query_entry *ptr =
1689 list_entry(tmp, typeof(*ptr), list);
1690 if (ptr->answer)
1691 continue;
1692 if (pos++ != head->r.query_index)
1693 continue;
1694 /*
1695 * Some query can be skipped because tomoyo_query_list
1696 * can change, but I don't care.
1697 */
1698 if (len == ptr->query_len)
1699 memmove(buf, ptr->query, len);
1700 break;
1701 }
1702 spin_unlock(&tomoyo_query_list_lock);
1703 if (buf[0]) {
1704 head->read_buf = buf;
1705 head->r.w[head->r.w_pos++] = buf;
1706 head->r.query_index++;
1707 } else {
1708 kfree(buf);
1709 }
1710 }
1711
1712 /**
1713 * tomoyo_write_answer - Write the supervisor's decision.
1714 *
1715 * @head: Pointer to "struct tomoyo_io_buffer".
1716 *
1717 * Returns 0 on success, -EINVAL otherwise.
1718 */
1719 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1720 {
1721 char *data = head->write_buf;
1722 struct list_head *tmp;
1723 unsigned int serial;
1724 unsigned int answer;
1725 spin_lock(&tomoyo_query_list_lock);
1726 list_for_each(tmp, &tomoyo_query_list) {
1727 struct tomoyo_query_entry *ptr
1728 = list_entry(tmp, struct tomoyo_query_entry, list);
1729 ptr->timer = 0;
1730 }
1731 spin_unlock(&tomoyo_query_list_lock);
1732 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1733 return -EINVAL;
1734 spin_lock(&tomoyo_query_list_lock);
1735 list_for_each(tmp, &tomoyo_query_list) {
1736 struct tomoyo_query_entry *ptr
1737 = list_entry(tmp, struct tomoyo_query_entry, list);
1738 if (ptr->serial != serial)
1739 continue;
1740 if (!ptr->answer)
1741 ptr->answer = answer;
1742 break;
1743 }
1744 spin_unlock(&tomoyo_query_list_lock);
1745 return 0;
1746 }
1747
1748 /**
1749 * tomoyo_read_version: Get version.
1750 *
1751 * @head: Pointer to "struct tomoyo_io_buffer".
1752 *
1753 * Returns version information.
1754 */
1755 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1756 {
1757 if (!head->r.eof) {
1758 tomoyo_io_printf(head, "2.3.0-pre");
1759 head->r.eof = true;
1760 }
1761 }
1762
1763 /**
1764 * tomoyo_read_self_domain - Get the current process's domainname.
1765 *
1766 * @head: Pointer to "struct tomoyo_io_buffer".
1767 *
1768 * Returns the current process's domainname.
1769 */
1770 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1771 {
1772 if (!head->r.eof) {
1773 /*
1774 * tomoyo_domain()->domainname != NULL
1775 * because every process belongs to a domain and
1776 * the domain's name cannot be NULL.
1777 */
1778 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1779 head->r.eof = true;
1780 }
1781 }
1782
1783 /**
1784 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1785 *
1786 * @type: Type of interface.
1787 * @file: Pointer to "struct file".
1788 *
1789 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1790 *
1791 * Caller acquires tomoyo_read_lock().
1792 */
1793 int tomoyo_open_control(const u8 type, struct file *file)
1794 {
1795 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1796
1797 if (!head)
1798 return -ENOMEM;
1799 mutex_init(&head->io_sem);
1800 head->type = type;
1801 switch (type) {
1802 case TOMOYO_DOMAINPOLICY:
1803 /* /sys/kernel/security/tomoyo/domain_policy */
1804 head->write = tomoyo_write_domain_policy;
1805 head->read = tomoyo_read_domain_policy;
1806 break;
1807 case TOMOYO_EXCEPTIONPOLICY:
1808 /* /sys/kernel/security/tomoyo/exception_policy */
1809 head->write = tomoyo_write_exception_policy;
1810 head->read = tomoyo_read_exception_policy;
1811 break;
1812 case TOMOYO_SELFDOMAIN:
1813 /* /sys/kernel/security/tomoyo/self_domain */
1814 head->read = tomoyo_read_self_domain;
1815 break;
1816 case TOMOYO_DOMAIN_STATUS:
1817 /* /sys/kernel/security/tomoyo/.domain_status */
1818 head->write = tomoyo_write_domain_profile;
1819 head->read = tomoyo_read_domain_profile;
1820 break;
1821 case TOMOYO_PROCESS_STATUS:
1822 /* /sys/kernel/security/tomoyo/.process_status */
1823 head->write = tomoyo_write_pid;
1824 head->read = tomoyo_read_pid;
1825 break;
1826 case TOMOYO_VERSION:
1827 /* /sys/kernel/security/tomoyo/version */
1828 head->read = tomoyo_read_version;
1829 head->readbuf_size = 128;
1830 break;
1831 case TOMOYO_MEMINFO:
1832 /* /sys/kernel/security/tomoyo/meminfo */
1833 head->write = tomoyo_write_memory_quota;
1834 head->read = tomoyo_read_memory_counter;
1835 head->readbuf_size = 512;
1836 break;
1837 case TOMOYO_PROFILE:
1838 /* /sys/kernel/security/tomoyo/profile */
1839 head->write = tomoyo_write_profile;
1840 head->read = tomoyo_read_profile;
1841 break;
1842 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1843 head->poll = tomoyo_poll_query;
1844 head->write = tomoyo_write_answer;
1845 head->read = tomoyo_read_query;
1846 break;
1847 case TOMOYO_MANAGER:
1848 /* /sys/kernel/security/tomoyo/manager */
1849 head->write = tomoyo_write_manager_policy;
1850 head->read = tomoyo_read_manager_policy;
1851 break;
1852 }
1853 if (!(file->f_mode & FMODE_READ)) {
1854 /*
1855 * No need to allocate read_buf since it is not opened
1856 * for reading.
1857 */
1858 head->read = NULL;
1859 head->poll = NULL;
1860 } else if (!head->poll) {
1861 /* Don't allocate read_buf for poll() access. */
1862 if (!head->readbuf_size)
1863 head->readbuf_size = 4096 * 2;
1864 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1865 if (!head->read_buf) {
1866 kfree(head);
1867 return -ENOMEM;
1868 }
1869 }
1870 if (!(file->f_mode & FMODE_WRITE)) {
1871 /*
1872 * No need to allocate write_buf since it is not opened
1873 * for writing.
1874 */
1875 head->write = NULL;
1876 } else if (head->write) {
1877 head->writebuf_size = 4096 * 2;
1878 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1879 if (!head->write_buf) {
1880 kfree(head->read_buf);
1881 kfree(head);
1882 return -ENOMEM;
1883 }
1884 }
1885 if (type != TOMOYO_QUERY)
1886 head->reader_idx = tomoyo_read_lock();
1887 file->private_data = head;
1888 /*
1889 * Call the handler now if the file is
1890 * /sys/kernel/security/tomoyo/self_domain
1891 * so that the user can use
1892 * cat < /sys/kernel/security/tomoyo/self_domain"
1893 * to know the current process's domainname.
1894 */
1895 if (type == TOMOYO_SELFDOMAIN)
1896 tomoyo_read_control(file, NULL, 0);
1897 /*
1898 * If the file is /sys/kernel/security/tomoyo/query , increment the
1899 * observer counter.
1900 * The obserber counter is used by tomoyo_supervisor() to see if
1901 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1902 */
1903 else if (type == TOMOYO_QUERY)
1904 atomic_inc(&tomoyo_query_observers);
1905 return 0;
1906 }
1907
1908 /**
1909 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1910 *
1911 * @file: Pointer to "struct file".
1912 * @wait: Pointer to "poll_table".
1913 *
1914 * Waits for read readiness.
1915 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1916 */
1917 int tomoyo_poll_control(struct file *file, poll_table *wait)
1918 {
1919 struct tomoyo_io_buffer *head = file->private_data;
1920 if (!head->poll)
1921 return -ENOSYS;
1922 return head->poll(file, wait);
1923 }
1924
1925 /**
1926 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1927 *
1928 * @file: Pointer to "struct file".
1929 * @buffer: Poiner to buffer to write to.
1930 * @buffer_len: Size of @buffer.
1931 *
1932 * Returns bytes read on success, negative value otherwise.
1933 *
1934 * Caller holds tomoyo_read_lock().
1935 */
1936 int tomoyo_read_control(struct file *file, char __user *buffer,
1937 const int buffer_len)
1938 {
1939 int len;
1940 struct tomoyo_io_buffer *head = file->private_data;
1941
1942 if (!head->read)
1943 return -ENOSYS;
1944 if (mutex_lock_interruptible(&head->io_sem))
1945 return -EINTR;
1946 head->read_user_buf = buffer;
1947 head->read_user_buf_avail = buffer_len;
1948 if (tomoyo_flush(head))
1949 /* Call the policy handler. */
1950 head->read(head);
1951 tomoyo_flush(head);
1952 len = head->read_user_buf - buffer;
1953 mutex_unlock(&head->io_sem);
1954 return len;
1955 }
1956
1957 /**
1958 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1959 *
1960 * @file: Pointer to "struct file".
1961 * @buffer: Pointer to buffer to read from.
1962 * @buffer_len: Size of @buffer.
1963 *
1964 * Returns @buffer_len on success, negative value otherwise.
1965 *
1966 * Caller holds tomoyo_read_lock().
1967 */
1968 int tomoyo_write_control(struct file *file, const char __user *buffer,
1969 const int buffer_len)
1970 {
1971 struct tomoyo_io_buffer *head = file->private_data;
1972 int error = buffer_len;
1973 int avail_len = buffer_len;
1974 char *cp0 = head->write_buf;
1975
1976 if (!head->write)
1977 return -ENOSYS;
1978 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1979 return -EFAULT;
1980 /* Don't allow updating policies by non manager programs. */
1981 if (head->write != tomoyo_write_pid &&
1982 head->write != tomoyo_write_domain_policy &&
1983 !tomoyo_policy_manager())
1984 return -EPERM;
1985 if (mutex_lock_interruptible(&head->io_sem))
1986 return -EINTR;
1987 /* Read a line and dispatch it to the policy handler. */
1988 while (avail_len > 0) {
1989 char c;
1990 if (head->write_avail >= head->writebuf_size - 1) {
1991 error = -ENOMEM;
1992 break;
1993 } else if (get_user(c, buffer)) {
1994 error = -EFAULT;
1995 break;
1996 }
1997 buffer++;
1998 avail_len--;
1999 cp0[head->write_avail++] = c;
2000 if (c != '\n')
2001 continue;
2002 cp0[head->write_avail - 1] = '\0';
2003 head->write_avail = 0;
2004 tomoyo_normalize_line(cp0);
2005 head->write(head);
2006 }
2007 mutex_unlock(&head->io_sem);
2008 return error;
2009 }
2010
2011 /**
2012 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2013 *
2014 * @file: Pointer to "struct file".
2015 *
2016 * Releases memory and returns 0.
2017 *
2018 * Caller looses tomoyo_read_lock().
2019 */
2020 int tomoyo_close_control(struct file *file)
2021 {
2022 struct tomoyo_io_buffer *head = file->private_data;
2023 const bool is_write = !!head->write_buf;
2024
2025 /*
2026 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2027 * observer counter.
2028 */
2029 if (head->type == TOMOYO_QUERY)
2030 atomic_dec(&tomoyo_query_observers);
2031 else
2032 tomoyo_read_unlock(head->reader_idx);
2033 /* Release memory used for policy I/O. */
2034 kfree(head->read_buf);
2035 head->read_buf = NULL;
2036 kfree(head->write_buf);
2037 head->write_buf = NULL;
2038 kfree(head);
2039 head = NULL;
2040 file->private_data = NULL;
2041 if (is_write)
2042 tomoyo_run_gc();
2043 return 0;
2044 }
2045
2046 /**
2047 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2048 */
2049 void tomoyo_check_profile(void)
2050 {
2051 struct tomoyo_domain_info *domain;
2052 const int idx = tomoyo_read_lock();
2053 tomoyo_policy_loaded = true;
2054 /* Check all profiles currently assigned to domains are defined. */
2055 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2056 const u8 profile = domain->profile;
2057 if (tomoyo_profile_ptr[profile])
2058 continue;
2059 panic("Profile %u (used by '%s') not defined.\n",
2060 profile, domain->domainname->name);
2061 }
2062 tomoyo_read_unlock(idx);
2063 if (tomoyo_profile_version != 20090903)
2064 panic("Profile version %u is not supported.\n",
2065 tomoyo_profile_version);
2066 printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n");
2067 printk(KERN_INFO "Mandatory Access Control activated.\n");
2068 }
Linux kernel - Deliverables
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