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[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 <linux/hardirq.h>
13 #include "common.h"
14
15 /* String table for functionality that takes 4 modes. */
16 static const char *tomoyo_mode_4[4] = {
17 "disabled", "learning", "permissive", "enforcing"
18 };
19 /* String table for functionality that takes 2 modes. */
20 static const char *tomoyo_mode_2[4] = {
21 "disabled", "enabled", "enabled", "enabled"
22 };
23
24 /*
25 * tomoyo_control_array is a static data which contains
26 *
27 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
28 * (2) initial values for "struct tomoyo_profile".
29 * (3) max values for "struct tomoyo_profile".
30 */
31 static struct {
32 const char *keyword;
33 unsigned int current_value;
34 const unsigned int max_value;
35 } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
36 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
37 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
38 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
39 };
40
41 /*
42 * tomoyo_profile is a structure which is used for holding the mode of access
43 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
44 * An administrator can define up to 256 profiles.
45 * The ->profile of "struct tomoyo_domain_info" is used for remembering
46 * the profile's number (0 - 255) assigned to that domain.
47 */
48 static struct tomoyo_profile {
49 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
50 const struct tomoyo_path_info *comment;
51 } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
52
53 /* Permit policy management by non-root user? */
54 static bool tomoyo_manage_by_non_root;
55
56 /* Utility functions. */
57
58 /**
59 * tomoyo_print_name_union - Print a tomoyo_name_union.
60 *
61 * @head: Pointer to "struct tomoyo_io_buffer".
62 * @ptr: Pointer to "struct tomoyo_name_union".
63 *
64 * Returns true on success, false otherwise.
65 */
66 static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
67 const struct tomoyo_name_union *ptr)
68 {
69 int pos = head->read_avail;
70 if (pos && head->read_buf[pos - 1] == ' ')
71 head->read_avail--;
72 if (ptr->is_group)
73 return tomoyo_io_printf(head, " @%s",
74 ptr->group->group_name->name);
75 return tomoyo_io_printf(head, " %s", ptr->filename->name);
76 }
77
78 /**
79 * tomoyo_print_number_union - Print a tomoyo_number_union.
80 *
81 * @head: Pointer to "struct tomoyo_io_buffer".
82 * @ptr: Pointer to "struct tomoyo_number_union".
83 *
84 * Returns true on success, false otherwise.
85 */
86 bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
87 const struct tomoyo_number_union *ptr)
88 {
89 unsigned long min;
90 unsigned long max;
91 u8 min_type;
92 u8 max_type;
93 if (!tomoyo_io_printf(head, " "))
94 return false;
95 if (ptr->is_group)
96 return tomoyo_io_printf(head, "@%s",
97 ptr->group->group_name->name);
98 min_type = ptr->min_type;
99 max_type = ptr->max_type;
100 min = ptr->values[0];
101 max = ptr->values[1];
102 switch (min_type) {
103 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
104 if (!tomoyo_io_printf(head, "0x%lX", min))
105 return false;
106 break;
107 case TOMOYO_VALUE_TYPE_OCTAL:
108 if (!tomoyo_io_printf(head, "0%lo", min))
109 return false;
110 break;
111 default:
112 if (!tomoyo_io_printf(head, "%lu", min))
113 return false;
114 break;
115 }
116 if (min == max && min_type == max_type)
117 return true;
118 switch (max_type) {
119 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
120 return tomoyo_io_printf(head, "-0x%lX", max);
121 case TOMOYO_VALUE_TYPE_OCTAL:
122 return tomoyo_io_printf(head, "-0%lo", max);
123 default:
124 return tomoyo_io_printf(head, "-%lu", max);
125 }
126 }
127
128 /**
129 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
130 *
131 * @head: Pointer to "struct tomoyo_io_buffer".
132 * @fmt: The printf()'s format string, followed by parameters.
133 *
134 * Returns true if output was written, false otherwise.
135 *
136 * The snprintf() will truncate, but tomoyo_io_printf() won't.
137 */
138 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
139 {
140 va_list args;
141 int len;
142 int pos = head->read_avail;
143 int size = head->readbuf_size - pos;
144
145 if (size <= 0)
146 return false;
147 va_start(args, fmt);
148 len = vsnprintf(head->read_buf + pos, size, fmt, args);
149 va_end(args);
150 if (pos + len >= head->readbuf_size)
151 return false;
152 head->read_avail += len;
153 return true;
154 }
155
156 /**
157 * tomoyo_check_flags - Check mode for specified functionality.
158 *
159 * @domain: Pointer to "struct tomoyo_domain_info".
160 * @index: The functionality to check mode.
161 *
162 * TOMOYO checks only process context.
163 * This code disables TOMOYO's enforcement in case the function is called from
164 * interrupt context.
165 */
166 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
167 const u8 index)
168 {
169 const u8 profile = domain->profile;
170
171 if (WARN_ON(in_interrupt()))
172 return 0;
173 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
174 #if TOMOYO_MAX_PROFILES != 256
175 && profile < TOMOYO_MAX_PROFILES
176 #endif
177 && tomoyo_profile_ptr[profile] ?
178 tomoyo_profile_ptr[profile]->value[index] : 0;
179 }
180
181 /**
182 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
183 *
184 * @domain: Pointer to "struct tomoyo_domain_info".
185 *
186 * Returns true if domain policy violation warning should be printed to
187 * console.
188 */
189 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
190 {
191 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
192 }
193
194 /**
195 * tomoyo_find_or_assign_new_profile - Create a new profile.
196 *
197 * @profile: Profile number to create.
198 *
199 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
200 */
201 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
202 int profile)
203 {
204 struct tomoyo_profile *ptr = NULL;
205 int i;
206
207 if (profile >= TOMOYO_MAX_PROFILES)
208 return NULL;
209 if (mutex_lock_interruptible(&tomoyo_policy_lock))
210 return NULL;
211 ptr = tomoyo_profile_ptr[profile];
212 if (ptr)
213 goto ok;
214 ptr = kmalloc(sizeof(*ptr), GFP_NOFS);
215 if (!tomoyo_memory_ok(ptr)) {
216 kfree(ptr);
217 ptr = NULL;
218 goto ok;
219 }
220 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
221 ptr->value[i] = tomoyo_control_array[i].current_value;
222 mb(); /* Avoid out-of-order execution. */
223 tomoyo_profile_ptr[profile] = ptr;
224 ok:
225 mutex_unlock(&tomoyo_policy_lock);
226 return ptr;
227 }
228
229 /**
230 * tomoyo_write_profile - Write to profile table.
231 *
232 * @head: Pointer to "struct tomoyo_io_buffer".
233 *
234 * Returns 0 on success, negative value otherwise.
235 */
236 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
237 {
238 char *data = head->write_buf;
239 unsigned int i;
240 unsigned int value;
241 char *cp;
242 struct tomoyo_profile *profile;
243 unsigned long num;
244
245 cp = strchr(data, '-');
246 if (cp)
247 *cp = '\0';
248 if (strict_strtoul(data, 10, &num))
249 return -EINVAL;
250 if (cp)
251 data = cp + 1;
252 profile = tomoyo_find_or_assign_new_profile(num);
253 if (!profile)
254 return -EINVAL;
255 cp = strchr(data, '=');
256 if (!cp)
257 return -EINVAL;
258 *cp = '\0';
259 if (!strcmp(data, "COMMENT")) {
260 const struct tomoyo_path_info *old_comment = profile->comment;
261 profile->comment = tomoyo_get_name(cp + 1);
262 tomoyo_put_name(old_comment);
263 return 0;
264 }
265 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
266 if (strcmp(data, tomoyo_control_array[i].keyword))
267 continue;
268 if (sscanf(cp + 1, "%u", &value) != 1) {
269 int j;
270 const char **modes;
271 switch (i) {
272 case TOMOYO_VERBOSE:
273 modes = tomoyo_mode_2;
274 break;
275 default:
276 modes = tomoyo_mode_4;
277 break;
278 }
279 for (j = 0; j < 4; j++) {
280 if (strcmp(cp + 1, modes[j]))
281 continue;
282 value = j;
283 break;
284 }
285 if (j == 4)
286 return -EINVAL;
287 } else if (value > tomoyo_control_array[i].max_value) {
288 value = tomoyo_control_array[i].max_value;
289 }
290 profile->value[i] = value;
291 return 0;
292 }
293 return -EINVAL;
294 }
295
296 /**
297 * tomoyo_read_profile - Read from profile table.
298 *
299 * @head: Pointer to "struct tomoyo_io_buffer".
300 *
301 * Returns 0.
302 */
303 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
304 {
305 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
306 int step;
307
308 if (head->read_eof)
309 return 0;
310 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
311 step++) {
312 const u8 index = step / total;
313 u8 type = step % total;
314 const struct tomoyo_profile *profile
315 = tomoyo_profile_ptr[index];
316 head->read_step = step;
317 if (!profile)
318 continue;
319 if (!type) { /* Print profile' comment tag. */
320 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
321 index, profile->comment ?
322 profile->comment->name : ""))
323 break;
324 continue;
325 }
326 type--;
327 if (type < TOMOYO_MAX_CONTROL_INDEX) {
328 const unsigned int value = profile->value[type];
329 const char **modes = NULL;
330 const char *keyword
331 = tomoyo_control_array[type].keyword;
332 switch (tomoyo_control_array[type].max_value) {
333 case 3:
334 modes = tomoyo_mode_4;
335 break;
336 case 1:
337 modes = tomoyo_mode_2;
338 break;
339 }
340 if (modes) {
341 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
342 keyword, modes[value]))
343 break;
344 } else {
345 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
346 keyword, value))
347 break;
348 }
349 }
350 }
351 if (step == TOMOYO_MAX_PROFILES * total)
352 head->read_eof = true;
353 return 0;
354 }
355
356 /*
357 * tomoyo_policy_manager_list is used for holding list of domainnames or
358 * programs which are permitted to modify configuration via
359 * /sys/kernel/security/tomoyo/ interface.
360 *
361 * An entry is added by
362 *
363 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
364 * /sys/kernel/security/tomoyo/manager
365 * (if you want to specify by a domainname)
366 *
367 * or
368 *
369 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
370 * (if you want to specify by a program's location)
371 *
372 * and is deleted by
373 *
374 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
375 * /sys/kernel/security/tomoyo/manager
376 *
377 * or
378 *
379 * # echo 'delete /usr/lib/ccs/editpolicy' > \
380 * /sys/kernel/security/tomoyo/manager
381 *
382 * and all entries are retrieved by
383 *
384 * # cat /sys/kernel/security/tomoyo/manager
385 */
386 LIST_HEAD(tomoyo_policy_manager_list);
387
388 /**
389 * tomoyo_update_manager_entry - Add a manager entry.
390 *
391 * @manager: The path to manager or the domainnamme.
392 * @is_delete: True if it is a delete request.
393 *
394 * Returns 0 on success, negative value otherwise.
395 *
396 * Caller holds tomoyo_read_lock().
397 */
398 static int tomoyo_update_manager_entry(const char *manager,
399 const bool is_delete)
400 {
401 struct tomoyo_policy_manager_entry *ptr;
402 struct tomoyo_policy_manager_entry e = { };
403 int error = is_delete ? -ENOENT : -ENOMEM;
404
405 if (tomoyo_is_domain_def(manager)) {
406 if (!tomoyo_is_correct_domain(manager))
407 return -EINVAL;
408 e.is_domain = true;
409 } else {
410 if (!tomoyo_is_correct_path(manager, 1, -1, -1))
411 return -EINVAL;
412 }
413 e.manager = tomoyo_get_name(manager);
414 if (!e.manager)
415 return -ENOMEM;
416 if (mutex_lock_interruptible(&tomoyo_policy_lock))
417 goto out;
418 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
419 if (ptr->manager != e.manager)
420 continue;
421 ptr->is_deleted = is_delete;
422 error = 0;
423 break;
424 }
425 if (!is_delete && error) {
426 struct tomoyo_policy_manager_entry *entry =
427 tomoyo_commit_ok(&e, sizeof(e));
428 if (entry) {
429 list_add_tail_rcu(&entry->list,
430 &tomoyo_policy_manager_list);
431 error = 0;
432 }
433 }
434 mutex_unlock(&tomoyo_policy_lock);
435 out:
436 tomoyo_put_name(e.manager);
437 return error;
438 }
439
440 /**
441 * tomoyo_write_manager_policy - Write manager policy.
442 *
443 * @head: Pointer to "struct tomoyo_io_buffer".
444 *
445 * Returns 0 on success, negative value otherwise.
446 *
447 * Caller holds tomoyo_read_lock().
448 */
449 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
450 {
451 char *data = head->write_buf;
452 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
453
454 if (!strcmp(data, "manage_by_non_root")) {
455 tomoyo_manage_by_non_root = !is_delete;
456 return 0;
457 }
458 return tomoyo_update_manager_entry(data, is_delete);
459 }
460
461 /**
462 * tomoyo_read_manager_policy - Read manager policy.
463 *
464 * @head: Pointer to "struct tomoyo_io_buffer".
465 *
466 * Returns 0.
467 *
468 * Caller holds tomoyo_read_lock().
469 */
470 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
471 {
472 struct list_head *pos;
473 bool done = true;
474
475 if (head->read_eof)
476 return 0;
477 list_for_each_cookie(pos, head->read_var2,
478 &tomoyo_policy_manager_list) {
479 struct tomoyo_policy_manager_entry *ptr;
480 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
481 list);
482 if (ptr->is_deleted)
483 continue;
484 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
485 if (!done)
486 break;
487 }
488 head->read_eof = done;
489 return 0;
490 }
491
492 /**
493 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
494 *
495 * Returns true if the current process is permitted to modify policy
496 * via /sys/kernel/security/tomoyo/ interface.
497 *
498 * Caller holds tomoyo_read_lock().
499 */
500 static bool tomoyo_is_policy_manager(void)
501 {
502 struct tomoyo_policy_manager_entry *ptr;
503 const char *exe;
504 const struct task_struct *task = current;
505 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
506 bool found = false;
507
508 if (!tomoyo_policy_loaded)
509 return true;
510 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
511 return false;
512 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
513 if (!ptr->is_deleted && ptr->is_domain
514 && !tomoyo_pathcmp(domainname, ptr->manager)) {
515 found = true;
516 break;
517 }
518 }
519 if (found)
520 return true;
521 exe = tomoyo_get_exe();
522 if (!exe)
523 return false;
524 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
525 if (!ptr->is_deleted && !ptr->is_domain
526 && !strcmp(exe, ptr->manager->name)) {
527 found = true;
528 break;
529 }
530 }
531 if (!found) { /* Reduce error messages. */
532 static pid_t last_pid;
533 const pid_t pid = current->pid;
534 if (last_pid != pid) {
535 printk(KERN_WARNING "%s ( %s ) is not permitted to "
536 "update policies.\n", domainname->name, exe);
537 last_pid = pid;
538 }
539 }
540 kfree(exe);
541 return found;
542 }
543
544 /**
545 * tomoyo_is_select_one - Parse select command.
546 *
547 * @head: Pointer to "struct tomoyo_io_buffer".
548 * @data: String to parse.
549 *
550 * Returns true on success, false otherwise.
551 *
552 * Caller holds tomoyo_read_lock().
553 */
554 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
555 const char *data)
556 {
557 unsigned int pid;
558 struct tomoyo_domain_info *domain = NULL;
559
560 if (sscanf(data, "pid=%u", &pid) == 1) {
561 struct task_struct *p;
562 rcu_read_lock();
563 read_lock(&tasklist_lock);
564 p = find_task_by_vpid(pid);
565 if (p)
566 domain = tomoyo_real_domain(p);
567 read_unlock(&tasklist_lock);
568 rcu_read_unlock();
569 } else if (!strncmp(data, "domain=", 7)) {
570 if (tomoyo_is_domain_def(data + 7))
571 domain = tomoyo_find_domain(data + 7);
572 } else
573 return false;
574 head->write_var1 = domain;
575 /* Accessing read_buf is safe because head->io_sem is held. */
576 if (!head->read_buf)
577 return true; /* Do nothing if open(O_WRONLY). */
578 head->read_avail = 0;
579 tomoyo_io_printf(head, "# select %s\n", data);
580 head->read_single_domain = true;
581 head->read_eof = !domain;
582 if (domain) {
583 struct tomoyo_domain_info *d;
584 head->read_var1 = NULL;
585 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
586 if (d == domain)
587 break;
588 head->read_var1 = &d->list;
589 }
590 head->read_var2 = NULL;
591 head->read_bit = 0;
592 head->read_step = 0;
593 if (domain->is_deleted)
594 tomoyo_io_printf(head, "# This is a deleted domain.\n");
595 }
596 return true;
597 }
598
599 /**
600 * tomoyo_delete_domain - Delete a domain.
601 *
602 * @domainname: The name of domain.
603 *
604 * Returns 0.
605 *
606 * Caller holds tomoyo_read_lock().
607 */
608 static int tomoyo_delete_domain(char *domainname)
609 {
610 struct tomoyo_domain_info *domain;
611 struct tomoyo_path_info name;
612
613 name.name = domainname;
614 tomoyo_fill_path_info(&name);
615 if (mutex_lock_interruptible(&tomoyo_policy_lock))
616 return 0;
617 /* Is there an active domain? */
618 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
619 /* Never delete tomoyo_kernel_domain */
620 if (domain == &tomoyo_kernel_domain)
621 continue;
622 if (domain->is_deleted ||
623 tomoyo_pathcmp(domain->domainname, &name))
624 continue;
625 domain->is_deleted = true;
626 break;
627 }
628 mutex_unlock(&tomoyo_policy_lock);
629 return 0;
630 }
631
632 /**
633 * tomoyo_write_domain_policy2 - Write domain policy.
634 *
635 * @head: Pointer to "struct tomoyo_io_buffer".
636 *
637 * Returns 0 on success, negative value otherwise.
638 *
639 * Caller holds tomoyo_read_lock().
640 */
641 static int tomoyo_write_domain_policy2(char *data,
642 struct tomoyo_domain_info *domain,
643 const bool is_delete)
644 {
645 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
646 return tomoyo_write_mount_policy(data, domain, is_delete);
647 return tomoyo_write_file_policy(data, domain, is_delete);
648 }
649
650 /**
651 * tomoyo_write_domain_policy - Write domain policy.
652 *
653 * @head: Pointer to "struct tomoyo_io_buffer".
654 *
655 * Returns 0 on success, negative value otherwise.
656 *
657 * Caller holds tomoyo_read_lock().
658 */
659 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
660 {
661 char *data = head->write_buf;
662 struct tomoyo_domain_info *domain = head->write_var1;
663 bool is_delete = false;
664 bool is_select = false;
665 unsigned int profile;
666
667 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
668 is_delete = true;
669 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
670 is_select = true;
671 if (is_select && tomoyo_is_select_one(head, data))
672 return 0;
673 /* Don't allow updating policies by non manager programs. */
674 if (!tomoyo_is_policy_manager())
675 return -EPERM;
676 if (tomoyo_is_domain_def(data)) {
677 domain = NULL;
678 if (is_delete)
679 tomoyo_delete_domain(data);
680 else if (is_select)
681 domain = tomoyo_find_domain(data);
682 else
683 domain = tomoyo_find_or_assign_new_domain(data, 0);
684 head->write_var1 = domain;
685 return 0;
686 }
687 if (!domain)
688 return -EINVAL;
689
690 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
691 && profile < TOMOYO_MAX_PROFILES) {
692 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
693 domain->profile = (u8) profile;
694 return 0;
695 }
696 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
697 domain->ignore_global_allow_read = !is_delete;
698 return 0;
699 }
700 return tomoyo_write_domain_policy2(data, domain, is_delete);
701 }
702
703 /**
704 * tomoyo_print_path_acl - Print a single path ACL entry.
705 *
706 * @head: Pointer to "struct tomoyo_io_buffer".
707 * @ptr: Pointer to "struct tomoyo_path_acl".
708 *
709 * Returns true on success, false otherwise.
710 */
711 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
712 struct tomoyo_path_acl *ptr)
713 {
714 int pos;
715 u8 bit;
716 const u16 perm = ptr->perm;
717
718 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
719 if (!(perm & (1 << bit)))
720 continue;
721 /* Print "read/write" instead of "read" and "write". */
722 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
723 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
724 continue;
725 pos = head->read_avail;
726 if (!tomoyo_io_printf(head, "allow_%s ",
727 tomoyo_path2keyword(bit)) ||
728 !tomoyo_print_name_union(head, &ptr->name) ||
729 !tomoyo_io_printf(head, "\n"))
730 goto out;
731 }
732 head->read_bit = 0;
733 return true;
734 out:
735 head->read_bit = bit;
736 head->read_avail = pos;
737 return false;
738 }
739
740 /**
741 * tomoyo_print_path2_acl - Print a double path ACL entry.
742 *
743 * @head: Pointer to "struct tomoyo_io_buffer".
744 * @ptr: Pointer to "struct tomoyo_path2_acl".
745 *
746 * Returns true on success, false otherwise.
747 */
748 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
749 struct tomoyo_path2_acl *ptr)
750 {
751 int pos;
752 const u8 perm = ptr->perm;
753 u8 bit;
754
755 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
756 if (!(perm & (1 << bit)))
757 continue;
758 pos = head->read_avail;
759 if (!tomoyo_io_printf(head, "allow_%s ",
760 tomoyo_path22keyword(bit)) ||
761 !tomoyo_print_name_union(head, &ptr->name1) ||
762 !tomoyo_print_name_union(head, &ptr->name2) ||
763 !tomoyo_io_printf(head, "\n"))
764 goto out;
765 }
766 head->read_bit = 0;
767 return true;
768 out:
769 head->read_bit = bit;
770 head->read_avail = pos;
771 return false;
772 }
773
774 /**
775 * tomoyo_print_path_number_acl - Print a path_number ACL entry.
776 *
777 * @head: Pointer to "struct tomoyo_io_buffer".
778 * @ptr: Pointer to "struct tomoyo_path_number_acl".
779 *
780 * Returns true on success, false otherwise.
781 */
782 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
783 struct tomoyo_path_number_acl *ptr)
784 {
785 int pos;
786 u8 bit;
787 const u8 perm = ptr->perm;
788 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
789 bit++) {
790 if (!(perm & (1 << bit)))
791 continue;
792 pos = head->read_avail;
793 if (!tomoyo_io_printf(head, "allow_%s",
794 tomoyo_path_number2keyword(bit)) ||
795 !tomoyo_print_name_union(head, &ptr->name) ||
796 !tomoyo_print_number_union(head, &ptr->number) ||
797 !tomoyo_io_printf(head, "\n"))
798 goto out;
799 }
800 head->read_bit = 0;
801 return true;
802 out:
803 head->read_bit = bit;
804 head->read_avail = pos;
805 return false;
806 }
807
808 /**
809 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
810 *
811 * @head: Pointer to "struct tomoyo_io_buffer".
812 * @ptr: Pointer to "struct tomoyo_path_number3_acl".
813 *
814 * Returns true on success, false otherwise.
815 */
816 static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
817 struct tomoyo_path_number3_acl *ptr)
818 {
819 int pos;
820 u8 bit;
821 const u16 perm = ptr->perm;
822 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
823 bit++) {
824 if (!(perm & (1 << bit)))
825 continue;
826 pos = head->read_avail;
827 if (!tomoyo_io_printf(head, "allow_%s",
828 tomoyo_path_number32keyword(bit)) ||
829 !tomoyo_print_name_union(head, &ptr->name) ||
830 !tomoyo_print_number_union(head, &ptr->mode) ||
831 !tomoyo_print_number_union(head, &ptr->major) ||
832 !tomoyo_print_number_union(head, &ptr->minor) ||
833 !tomoyo_io_printf(head, "\n"))
834 goto out;
835 }
836 head->read_bit = 0;
837 return true;
838 out:
839 head->read_bit = bit;
840 head->read_avail = pos;
841 return false;
842 }
843
844 /**
845 * tomoyo_print_mount_acl - Print a mount ACL entry.
846 *
847 * @head: Pointer to "struct tomoyo_io_buffer".
848 * @ptr: Pointer to "struct tomoyo_mount_acl".
849 *
850 * Returns true on success, false otherwise.
851 */
852 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
853 struct tomoyo_mount_acl *ptr)
854 {
855 const int pos = head->read_avail;
856 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
857 !tomoyo_print_name_union(head, &ptr->dev_name) ||
858 !tomoyo_print_name_union(head, &ptr->dir_name) ||
859 !tomoyo_print_name_union(head, &ptr->fs_type) ||
860 !tomoyo_print_number_union(head, &ptr->flags) ||
861 !tomoyo_io_printf(head, "\n")) {
862 head->read_avail = pos;
863 return false;
864 }
865 return true;
866 }
867
868 /**
869 * tomoyo_print_entry - Print an ACL entry.
870 *
871 * @head: Pointer to "struct tomoyo_io_buffer".
872 * @ptr: Pointer to an ACL entry.
873 *
874 * Returns true on success, false otherwise.
875 */
876 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
877 struct tomoyo_acl_info *ptr)
878 {
879 const u8 acl_type = ptr->type;
880
881 if (acl_type == TOMOYO_TYPE_PATH_ACL) {
882 struct tomoyo_path_acl *acl
883 = container_of(ptr, struct tomoyo_path_acl, head);
884 return tomoyo_print_path_acl(head, acl);
885 }
886 if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
887 struct tomoyo_path2_acl *acl
888 = container_of(ptr, struct tomoyo_path2_acl, head);
889 return tomoyo_print_path2_acl(head, acl);
890 }
891 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
892 struct tomoyo_path_number_acl *acl
893 = container_of(ptr, struct tomoyo_path_number_acl,
894 head);
895 return tomoyo_print_path_number_acl(head, acl);
896 }
897 if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) {
898 struct tomoyo_path_number3_acl *acl
899 = container_of(ptr, struct tomoyo_path_number3_acl,
900 head);
901 return tomoyo_print_path_number3_acl(head, acl);
902 }
903 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
904 struct tomoyo_mount_acl *acl
905 = container_of(ptr, struct tomoyo_mount_acl, head);
906 return tomoyo_print_mount_acl(head, acl);
907 }
908 BUG(); /* This must not happen. */
909 return false;
910 }
911
912 /**
913 * tomoyo_read_domain_policy - Read domain policy.
914 *
915 * @head: Pointer to "struct tomoyo_io_buffer".
916 *
917 * Returns 0.
918 *
919 * Caller holds tomoyo_read_lock().
920 */
921 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
922 {
923 struct list_head *dpos;
924 struct list_head *apos;
925 bool done = true;
926
927 if (head->read_eof)
928 return 0;
929 if (head->read_step == 0)
930 head->read_step = 1;
931 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
932 struct tomoyo_domain_info *domain;
933 const char *quota_exceeded = "";
934 const char *transition_failed = "";
935 const char *ignore_global_allow_read = "";
936 domain = list_entry(dpos, struct tomoyo_domain_info, list);
937 if (head->read_step != 1)
938 goto acl_loop;
939 if (domain->is_deleted && !head->read_single_domain)
940 continue;
941 /* Print domainname and flags. */
942 if (domain->quota_warned)
943 quota_exceeded = "quota_exceeded\n";
944 if (domain->transition_failed)
945 transition_failed = "transition_failed\n";
946 if (domain->ignore_global_allow_read)
947 ignore_global_allow_read
948 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
949 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
950 "%u\n%s%s%s\n",
951 domain->domainname->name,
952 domain->profile, quota_exceeded,
953 transition_failed,
954 ignore_global_allow_read);
955 if (!done)
956 break;
957 head->read_step = 2;
958 acl_loop:
959 if (head->read_step == 3)
960 goto tail_mark;
961 /* Print ACL entries in the domain. */
962 list_for_each_cookie(apos, head->read_var2,
963 &domain->acl_info_list) {
964 struct tomoyo_acl_info *ptr
965 = list_entry(apos, struct tomoyo_acl_info,
966 list);
967 done = tomoyo_print_entry(head, ptr);
968 if (!done)
969 break;
970 }
971 if (!done)
972 break;
973 head->read_step = 3;
974 tail_mark:
975 done = tomoyo_io_printf(head, "\n");
976 if (!done)
977 break;
978 head->read_step = 1;
979 if (head->read_single_domain)
980 break;
981 }
982 head->read_eof = done;
983 return 0;
984 }
985
986 /**
987 * tomoyo_write_domain_profile - Assign profile for specified domain.
988 *
989 * @head: Pointer to "struct tomoyo_io_buffer".
990 *
991 * Returns 0 on success, -EINVAL otherwise.
992 *
993 * This is equivalent to doing
994 *
995 * ( echo "select " $domainname; echo "use_profile " $profile ) |
996 * /usr/lib/ccs/loadpolicy -d
997 *
998 * Caller holds tomoyo_read_lock().
999 */
1000 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1001 {
1002 char *data = head->write_buf;
1003 char *cp = strchr(data, ' ');
1004 struct tomoyo_domain_info *domain;
1005 unsigned long profile;
1006
1007 if (!cp)
1008 return -EINVAL;
1009 *cp = '\0';
1010 domain = tomoyo_find_domain(cp + 1);
1011 if (strict_strtoul(data, 10, &profile))
1012 return -EINVAL;
1013 if (domain && profile < TOMOYO_MAX_PROFILES
1014 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1015 domain->profile = (u8) profile;
1016 return 0;
1017 }
1018
1019 /**
1020 * tomoyo_read_domain_profile - Read only domainname and profile.
1021 *
1022 * @head: Pointer to "struct tomoyo_io_buffer".
1023 *
1024 * Returns list of profile number and domainname pairs.
1025 *
1026 * This is equivalent to doing
1027 *
1028 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1029 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1030 * domainname = $0; } else if ( $1 == "use_profile" ) {
1031 * print $2 " " domainname; domainname = ""; } } ; '
1032 *
1033 * Caller holds tomoyo_read_lock().
1034 */
1035 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1036 {
1037 struct list_head *pos;
1038 bool done = true;
1039
1040 if (head->read_eof)
1041 return 0;
1042 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1043 struct tomoyo_domain_info *domain;
1044 domain = list_entry(pos, struct tomoyo_domain_info, list);
1045 if (domain->is_deleted)
1046 continue;
1047 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1048 domain->domainname->name);
1049 if (!done)
1050 break;
1051 }
1052 head->read_eof = done;
1053 return 0;
1054 }
1055
1056 /**
1057 * tomoyo_write_pid: Specify PID to obtain domainname.
1058 *
1059 * @head: Pointer to "struct tomoyo_io_buffer".
1060 *
1061 * Returns 0.
1062 */
1063 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1064 {
1065 unsigned long pid;
1066 /* No error check. */
1067 strict_strtoul(head->write_buf, 10, &pid);
1068 head->read_step = (int) pid;
1069 head->read_eof = false;
1070 return 0;
1071 }
1072
1073 /**
1074 * tomoyo_read_pid - Get domainname of the specified PID.
1075 *
1076 * @head: Pointer to "struct tomoyo_io_buffer".
1077 *
1078 * Returns the domainname which the specified PID is in on success,
1079 * empty string otherwise.
1080 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1081 * using read()/write() interface rather than sysctl() interface.
1082 */
1083 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1084 {
1085 if (head->read_avail == 0 && !head->read_eof) {
1086 const int pid = head->read_step;
1087 struct task_struct *p;
1088 struct tomoyo_domain_info *domain = NULL;
1089 rcu_read_lock();
1090 read_lock(&tasklist_lock);
1091 p = find_task_by_vpid(pid);
1092 if (p)
1093 domain = tomoyo_real_domain(p);
1094 read_unlock(&tasklist_lock);
1095 rcu_read_unlock();
1096 if (domain)
1097 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1098 domain->domainname->name);
1099 head->read_eof = true;
1100 }
1101 return 0;
1102 }
1103
1104 /**
1105 * tomoyo_write_exception_policy - Write exception policy.
1106 *
1107 * @head: Pointer to "struct tomoyo_io_buffer".
1108 *
1109 * Returns 0 on success, negative value otherwise.
1110 *
1111 * Caller holds tomoyo_read_lock().
1112 */
1113 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1114 {
1115 char *data = head->write_buf;
1116 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1117
1118 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1119 return tomoyo_write_domain_keeper_policy(data, false,
1120 is_delete);
1121 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1122 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1123 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1124 return tomoyo_write_domain_initializer_policy(data, false,
1125 is_delete);
1126 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1127 return tomoyo_write_domain_initializer_policy(data, true,
1128 is_delete);
1129 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1130 return tomoyo_write_alias_policy(data, is_delete);
1131 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1132 return tomoyo_write_globally_readable_policy(data, is_delete);
1133 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1134 return tomoyo_write_pattern_policy(data, is_delete);
1135 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1136 return tomoyo_write_no_rewrite_policy(data, is_delete);
1137 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1138 return tomoyo_write_path_group_policy(data, is_delete);
1139 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1140 return tomoyo_write_number_group_policy(data, is_delete);
1141 return -EINVAL;
1142 }
1143
1144 /**
1145 * tomoyo_read_exception_policy - Read exception policy.
1146 *
1147 * @head: Pointer to "struct tomoyo_io_buffer".
1148 *
1149 * Returns 0 on success, -EINVAL otherwise.
1150 *
1151 * Caller holds tomoyo_read_lock().
1152 */
1153 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1154 {
1155 if (!head->read_eof) {
1156 switch (head->read_step) {
1157 case 0:
1158 head->read_var2 = NULL;
1159 head->read_step = 1;
1160 case 1:
1161 if (!tomoyo_read_domain_keeper_policy(head))
1162 break;
1163 head->read_var2 = NULL;
1164 head->read_step = 2;
1165 case 2:
1166 if (!tomoyo_read_globally_readable_policy(head))
1167 break;
1168 head->read_var2 = NULL;
1169 head->read_step = 3;
1170 case 3:
1171 head->read_var2 = NULL;
1172 head->read_step = 4;
1173 case 4:
1174 if (!tomoyo_read_domain_initializer_policy(head))
1175 break;
1176 head->read_var2 = NULL;
1177 head->read_step = 5;
1178 case 5:
1179 if (!tomoyo_read_alias_policy(head))
1180 break;
1181 head->read_var2 = NULL;
1182 head->read_step = 6;
1183 case 6:
1184 head->read_var2 = NULL;
1185 head->read_step = 7;
1186 case 7:
1187 if (!tomoyo_read_file_pattern(head))
1188 break;
1189 head->read_var2 = NULL;
1190 head->read_step = 8;
1191 case 8:
1192 if (!tomoyo_read_no_rewrite_policy(head))
1193 break;
1194 head->read_var2 = NULL;
1195 head->read_step = 9;
1196 case 9:
1197 if (!tomoyo_read_path_group_policy(head))
1198 break;
1199 head->read_var1 = NULL;
1200 head->read_var2 = NULL;
1201 head->read_step = 10;
1202 case 10:
1203 if (!tomoyo_read_number_group_policy(head))
1204 break;
1205 head->read_var1 = NULL;
1206 head->read_var2 = NULL;
1207 head->read_step = 11;
1208 case 11:
1209 head->read_eof = true;
1210 break;
1211 default:
1212 return -EINVAL;
1213 }
1214 }
1215 return 0;
1216 }
1217
1218 /**
1219 * tomoyo_print_header - Get header line of audit log.
1220 *
1221 * @r: Pointer to "struct tomoyo_request_info".
1222 *
1223 * Returns string representation.
1224 *
1225 * This function uses kmalloc(), so caller must kfree() if this function
1226 * didn't return NULL.
1227 */
1228 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1229 {
1230 static const char *tomoyo_mode_4[4] = {
1231 "disabled", "learning", "permissive", "enforcing"
1232 };
1233 struct timeval tv;
1234 const pid_t gpid = task_pid_nr(current);
1235 static const int tomoyo_buffer_len = 4096;
1236 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1237 if (!buffer)
1238 return NULL;
1239 do_gettimeofday(&tv);
1240 snprintf(buffer, tomoyo_buffer_len - 1,
1241 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1242 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1243 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1244 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1245 (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1246 current_uid(), current_gid(), current_euid(),
1247 current_egid(), current_suid(), current_sgid(),
1248 current_fsuid(), current_fsgid());
1249 return buffer;
1250 }
1251
1252 /**
1253 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1254 *
1255 * @len: Required size.
1256 * @r: Pointer to "struct tomoyo_request_info".
1257 *
1258 * Returns pointer to allocated memory.
1259 *
1260 * The @len is updated to add the header lines' size on success.
1261 *
1262 * This function uses kzalloc(), so caller must kfree() if this function
1263 * didn't return NULL.
1264 */
1265 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1266 {
1267 char *buf = NULL;
1268 const char *header;
1269 const char *domainname;
1270 if (!r->domain)
1271 r->domain = tomoyo_domain();
1272 domainname = r->domain->domainname->name;
1273 header = tomoyo_print_header(r);
1274 if (!header)
1275 return NULL;
1276 *len += strlen(domainname) + strlen(header) + 10;
1277 buf = kzalloc(*len, GFP_NOFS);
1278 if (buf)
1279 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1280 kfree(header);
1281 return buf;
1282 }
1283
1284 /* Wait queue for tomoyo_query_list. */
1285 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1286
1287 /* Lock for manipulating tomoyo_query_list. */
1288 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1289
1290 /* Structure for query. */
1291 struct tomoyo_query_entry {
1292 struct list_head list;
1293 char *query;
1294 int query_len;
1295 unsigned int serial;
1296 int timer;
1297 int answer;
1298 };
1299
1300 /* The list for "struct tomoyo_query_entry". */
1301 static LIST_HEAD(tomoyo_query_list);
1302
1303 /*
1304 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1305 * interface.
1306 */
1307 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1308
1309 /**
1310 * tomoyo_supervisor - Ask for the supervisor's decision.
1311 *
1312 * @r: Pointer to "struct tomoyo_request_info".
1313 * @fmt: The printf()'s format string, followed by parameters.
1314 *
1315 * Returns 0 if the supervisor decided to permit the access request which
1316 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1317 * supervisor decided to retry the access request which violated the policy in
1318 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1319 */
1320 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1321 {
1322 va_list args;
1323 int error = -EPERM;
1324 int pos;
1325 int len;
1326 static unsigned int tomoyo_serial;
1327 struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1328 bool quota_exceeded = false;
1329 char *header;
1330 switch (r->mode) {
1331 char *buffer;
1332 case TOMOYO_CONFIG_LEARNING:
1333 if (!tomoyo_domain_quota_is_ok(r))
1334 return 0;
1335 va_start(args, fmt);
1336 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1337 va_end(args);
1338 buffer = kmalloc(len, GFP_NOFS);
1339 if (!buffer)
1340 return 0;
1341 va_start(args, fmt);
1342 vsnprintf(buffer, len - 1, fmt, args);
1343 va_end(args);
1344 tomoyo_normalize_line(buffer);
1345 tomoyo_write_domain_policy2(buffer, r->domain, false);
1346 kfree(buffer);
1347 /* fall through */
1348 case TOMOYO_CONFIG_PERMISSIVE:
1349 return 0;
1350 }
1351 if (!r->domain)
1352 r->domain = tomoyo_domain();
1353 if (!atomic_read(&tomoyo_query_observers))
1354 return -EPERM;
1355 va_start(args, fmt);
1356 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1357 va_end(args);
1358 header = tomoyo_init_audit_log(&len, r);
1359 if (!header)
1360 goto out;
1361 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1362 if (!tomoyo_query_entry)
1363 goto out;
1364 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1365 if (!tomoyo_query_entry->query)
1366 goto out;
1367 len = ksize(tomoyo_query_entry->query);
1368 INIT_LIST_HEAD(&tomoyo_query_entry->list);
1369 spin_lock(&tomoyo_query_list_lock);
1370 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1371 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1372 quota_exceeded = true;
1373 } else {
1374 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1375 tomoyo_query_entry->serial = tomoyo_serial++;
1376 }
1377 spin_unlock(&tomoyo_query_list_lock);
1378 if (quota_exceeded)
1379 goto out;
1380 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1381 tomoyo_query_entry->serial, r->retry, header);
1382 kfree(header);
1383 header = NULL;
1384 va_start(args, fmt);
1385 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1386 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1387 va_end(args);
1388 spin_lock(&tomoyo_query_list_lock);
1389 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1390 spin_unlock(&tomoyo_query_list_lock);
1391 /* Give 10 seconds for supervisor's opinion. */
1392 for (tomoyo_query_entry->timer = 0;
1393 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1394 tomoyo_query_entry->timer++) {
1395 wake_up(&tomoyo_query_wait);
1396 set_current_state(TASK_INTERRUPTIBLE);
1397 schedule_timeout(HZ / 10);
1398 if (tomoyo_query_entry->answer)
1399 break;
1400 }
1401 spin_lock(&tomoyo_query_list_lock);
1402 list_del(&tomoyo_query_entry->list);
1403 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1404 spin_unlock(&tomoyo_query_list_lock);
1405 switch (tomoyo_query_entry->answer) {
1406 case 3: /* Asked to retry by administrator. */
1407 error = TOMOYO_RETRY_REQUEST;
1408 r->retry++;
1409 break;
1410 case 1:
1411 /* Granted by administrator. */
1412 error = 0;
1413 break;
1414 case 0:
1415 /* Timed out. */
1416 break;
1417 default:
1418 /* Rejected by administrator. */
1419 break;
1420 }
1421 out:
1422 if (tomoyo_query_entry)
1423 kfree(tomoyo_query_entry->query);
1424 kfree(tomoyo_query_entry);
1425 kfree(header);
1426 return error;
1427 }
1428
1429 /**
1430 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1431 *
1432 * @file: Pointer to "struct file".
1433 * @wait: Pointer to "poll_table".
1434 *
1435 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1436 *
1437 * Waits for access requests which violated policy in enforcing mode.
1438 */
1439 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1440 {
1441 struct list_head *tmp;
1442 bool found = false;
1443 u8 i;
1444 for (i = 0; i < 2; i++) {
1445 spin_lock(&tomoyo_query_list_lock);
1446 list_for_each(tmp, &tomoyo_query_list) {
1447 struct tomoyo_query_entry *ptr
1448 = list_entry(tmp, struct tomoyo_query_entry,
1449 list);
1450 if (ptr->answer)
1451 continue;
1452 found = true;
1453 break;
1454 }
1455 spin_unlock(&tomoyo_query_list_lock);
1456 if (found)
1457 return POLLIN | POLLRDNORM;
1458 if (i)
1459 break;
1460 poll_wait(file, &tomoyo_query_wait, wait);
1461 }
1462 return 0;
1463 }
1464
1465 /**
1466 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1467 *
1468 * @head: Pointer to "struct tomoyo_io_buffer".
1469 *
1470 * Returns 0.
1471 */
1472 static int tomoyo_read_query(struct tomoyo_io_buffer *head)
1473 {
1474 struct list_head *tmp;
1475 int pos = 0;
1476 int len = 0;
1477 char *buf;
1478 if (head->read_avail)
1479 return 0;
1480 if (head->read_buf) {
1481 kfree(head->read_buf);
1482 head->read_buf = NULL;
1483 head->readbuf_size = 0;
1484 }
1485 spin_lock(&tomoyo_query_list_lock);
1486 list_for_each(tmp, &tomoyo_query_list) {
1487 struct tomoyo_query_entry *ptr
1488 = list_entry(tmp, struct tomoyo_query_entry, list);
1489 if (ptr->answer)
1490 continue;
1491 if (pos++ != head->read_step)
1492 continue;
1493 len = ptr->query_len;
1494 break;
1495 }
1496 spin_unlock(&tomoyo_query_list_lock);
1497 if (!len) {
1498 head->read_step = 0;
1499 return 0;
1500 }
1501 buf = kzalloc(len, GFP_NOFS);
1502 if (!buf)
1503 return 0;
1504 pos = 0;
1505 spin_lock(&tomoyo_query_list_lock);
1506 list_for_each(tmp, &tomoyo_query_list) {
1507 struct tomoyo_query_entry *ptr
1508 = list_entry(tmp, struct tomoyo_query_entry, list);
1509 if (ptr->answer)
1510 continue;
1511 if (pos++ != head->read_step)
1512 continue;
1513 /*
1514 * Some query can be skipped because tomoyo_query_list
1515 * can change, but I don't care.
1516 */
1517 if (len == ptr->query_len)
1518 memmove(buf, ptr->query, len);
1519 break;
1520 }
1521 spin_unlock(&tomoyo_query_list_lock);
1522 if (buf[0]) {
1523 head->read_avail = len;
1524 head->readbuf_size = head->read_avail;
1525 head->read_buf = buf;
1526 head->read_step++;
1527 } else {
1528 kfree(buf);
1529 }
1530 return 0;
1531 }
1532
1533 /**
1534 * tomoyo_write_answer - Write the supervisor's decision.
1535 *
1536 * @head: Pointer to "struct tomoyo_io_buffer".
1537 *
1538 * Returns 0 on success, -EINVAL otherwise.
1539 */
1540 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1541 {
1542 char *data = head->write_buf;
1543 struct list_head *tmp;
1544 unsigned int serial;
1545 unsigned int answer;
1546 spin_lock(&tomoyo_query_list_lock);
1547 list_for_each(tmp, &tomoyo_query_list) {
1548 struct tomoyo_query_entry *ptr
1549 = list_entry(tmp, struct tomoyo_query_entry, list);
1550 ptr->timer = 0;
1551 }
1552 spin_unlock(&tomoyo_query_list_lock);
1553 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1554 return -EINVAL;
1555 spin_lock(&tomoyo_query_list_lock);
1556 list_for_each(tmp, &tomoyo_query_list) {
1557 struct tomoyo_query_entry *ptr
1558 = list_entry(tmp, struct tomoyo_query_entry, list);
1559 if (ptr->serial != serial)
1560 continue;
1561 if (!ptr->answer)
1562 ptr->answer = answer;
1563 break;
1564 }
1565 spin_unlock(&tomoyo_query_list_lock);
1566 return 0;
1567 }
1568
1569 /**
1570 * tomoyo_read_version: Get version.
1571 *
1572 * @head: Pointer to "struct tomoyo_io_buffer".
1573 *
1574 * Returns version information.
1575 */
1576 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1577 {
1578 if (!head->read_eof) {
1579 tomoyo_io_printf(head, "2.2.0");
1580 head->read_eof = true;
1581 }
1582 return 0;
1583 }
1584
1585 /**
1586 * tomoyo_read_self_domain - Get the current process's domainname.
1587 *
1588 * @head: Pointer to "struct tomoyo_io_buffer".
1589 *
1590 * Returns the current process's domainname.
1591 */
1592 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1593 {
1594 if (!head->read_eof) {
1595 /*
1596 * tomoyo_domain()->domainname != NULL
1597 * because every process belongs to a domain and
1598 * the domain's name cannot be NULL.
1599 */
1600 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1601 head->read_eof = true;
1602 }
1603 return 0;
1604 }
1605
1606 /**
1607 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1608 *
1609 * @type: Type of interface.
1610 * @file: Pointer to "struct file".
1611 *
1612 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1613 *
1614 * Caller acquires tomoyo_read_lock().
1615 */
1616 int tomoyo_open_control(const u8 type, struct file *file)
1617 {
1618 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1619
1620 if (!head)
1621 return -ENOMEM;
1622 mutex_init(&head->io_sem);
1623 head->type = type;
1624 switch (type) {
1625 case TOMOYO_DOMAINPOLICY:
1626 /* /sys/kernel/security/tomoyo/domain_policy */
1627 head->write = tomoyo_write_domain_policy;
1628 head->read = tomoyo_read_domain_policy;
1629 break;
1630 case TOMOYO_EXCEPTIONPOLICY:
1631 /* /sys/kernel/security/tomoyo/exception_policy */
1632 head->write = tomoyo_write_exception_policy;
1633 head->read = tomoyo_read_exception_policy;
1634 break;
1635 case TOMOYO_SELFDOMAIN:
1636 /* /sys/kernel/security/tomoyo/self_domain */
1637 head->read = tomoyo_read_self_domain;
1638 break;
1639 case TOMOYO_DOMAIN_STATUS:
1640 /* /sys/kernel/security/tomoyo/.domain_status */
1641 head->write = tomoyo_write_domain_profile;
1642 head->read = tomoyo_read_domain_profile;
1643 break;
1644 case TOMOYO_PROCESS_STATUS:
1645 /* /sys/kernel/security/tomoyo/.process_status */
1646 head->write = tomoyo_write_pid;
1647 head->read = tomoyo_read_pid;
1648 break;
1649 case TOMOYO_VERSION:
1650 /* /sys/kernel/security/tomoyo/version */
1651 head->read = tomoyo_read_version;
1652 head->readbuf_size = 128;
1653 break;
1654 case TOMOYO_MEMINFO:
1655 /* /sys/kernel/security/tomoyo/meminfo */
1656 head->write = tomoyo_write_memory_quota;
1657 head->read = tomoyo_read_memory_counter;
1658 head->readbuf_size = 512;
1659 break;
1660 case TOMOYO_PROFILE:
1661 /* /sys/kernel/security/tomoyo/profile */
1662 head->write = tomoyo_write_profile;
1663 head->read = tomoyo_read_profile;
1664 break;
1665 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1666 head->poll = tomoyo_poll_query;
1667 head->write = tomoyo_write_answer;
1668 head->read = tomoyo_read_query;
1669 break;
1670 case TOMOYO_MANAGER:
1671 /* /sys/kernel/security/tomoyo/manager */
1672 head->write = tomoyo_write_manager_policy;
1673 head->read = tomoyo_read_manager_policy;
1674 break;
1675 }
1676 if (!(file->f_mode & FMODE_READ)) {
1677 /*
1678 * No need to allocate read_buf since it is not opened
1679 * for reading.
1680 */
1681 head->read = NULL;
1682 head->poll = NULL;
1683 } else if (!head->poll) {
1684 /* Don't allocate read_buf for poll() access. */
1685 if (!head->readbuf_size)
1686 head->readbuf_size = 4096 * 2;
1687 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1688 if (!head->read_buf) {
1689 kfree(head);
1690 return -ENOMEM;
1691 }
1692 }
1693 if (!(file->f_mode & FMODE_WRITE)) {
1694 /*
1695 * No need to allocate write_buf since it is not opened
1696 * for writing.
1697 */
1698 head->write = NULL;
1699 } else if (head->write) {
1700 head->writebuf_size = 4096 * 2;
1701 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1702 if (!head->write_buf) {
1703 kfree(head->read_buf);
1704 kfree(head);
1705 return -ENOMEM;
1706 }
1707 }
1708 if (type != TOMOYO_QUERY)
1709 head->reader_idx = tomoyo_read_lock();
1710 file->private_data = head;
1711 /*
1712 * Call the handler now if the file is
1713 * /sys/kernel/security/tomoyo/self_domain
1714 * so that the user can use
1715 * cat < /sys/kernel/security/tomoyo/self_domain"
1716 * to know the current process's domainname.
1717 */
1718 if (type == TOMOYO_SELFDOMAIN)
1719 tomoyo_read_control(file, NULL, 0);
1720 /*
1721 * If the file is /sys/kernel/security/tomoyo/query , increment the
1722 * observer counter.
1723 * The obserber counter is used by tomoyo_supervisor() to see if
1724 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1725 */
1726 else if (type == TOMOYO_QUERY)
1727 atomic_inc(&tomoyo_query_observers);
1728 return 0;
1729 }
1730
1731 /**
1732 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1733 *
1734 * @file: Pointer to "struct file".
1735 * @wait: Pointer to "poll_table".
1736 *
1737 * Waits for read readiness.
1738 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1739 */
1740 int tomoyo_poll_control(struct file *file, poll_table *wait)
1741 {
1742 struct tomoyo_io_buffer *head = file->private_data;
1743 if (!head->poll)
1744 return -ENOSYS;
1745 return head->poll(file, wait);
1746 }
1747
1748 /**
1749 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1750 *
1751 * @file: Pointer to "struct file".
1752 * @buffer: Poiner to buffer to write to.
1753 * @buffer_len: Size of @buffer.
1754 *
1755 * Returns bytes read on success, negative value otherwise.
1756 *
1757 * Caller holds tomoyo_read_lock().
1758 */
1759 int tomoyo_read_control(struct file *file, char __user *buffer,
1760 const int buffer_len)
1761 {
1762 int len = 0;
1763 struct tomoyo_io_buffer *head = file->private_data;
1764 char *cp;
1765
1766 if (!head->read)
1767 return -ENOSYS;
1768 if (mutex_lock_interruptible(&head->io_sem))
1769 return -EINTR;
1770 /* Call the policy handler. */
1771 len = head->read(head);
1772 if (len < 0)
1773 goto out;
1774 /* Write to buffer. */
1775 len = head->read_avail;
1776 if (len > buffer_len)
1777 len = buffer_len;
1778 if (!len)
1779 goto out;
1780 /* head->read_buf changes by some functions. */
1781 cp = head->read_buf;
1782 if (copy_to_user(buffer, cp, len)) {
1783 len = -EFAULT;
1784 goto out;
1785 }
1786 head->read_avail -= len;
1787 memmove(cp, cp + len, head->read_avail);
1788 out:
1789 mutex_unlock(&head->io_sem);
1790 return len;
1791 }
1792
1793 /**
1794 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1795 *
1796 * @file: Pointer to "struct file".
1797 * @buffer: Pointer to buffer to read from.
1798 * @buffer_len: Size of @buffer.
1799 *
1800 * Returns @buffer_len on success, negative value otherwise.
1801 *
1802 * Caller holds tomoyo_read_lock().
1803 */
1804 int tomoyo_write_control(struct file *file, const char __user *buffer,
1805 const int buffer_len)
1806 {
1807 struct tomoyo_io_buffer *head = file->private_data;
1808 int error = buffer_len;
1809 int avail_len = buffer_len;
1810 char *cp0 = head->write_buf;
1811
1812 if (!head->write)
1813 return -ENOSYS;
1814 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1815 return -EFAULT;
1816 /* Don't allow updating policies by non manager programs. */
1817 if (head->write != tomoyo_write_pid &&
1818 head->write != tomoyo_write_domain_policy &&
1819 !tomoyo_is_policy_manager())
1820 return -EPERM;
1821 if (mutex_lock_interruptible(&head->io_sem))
1822 return -EINTR;
1823 /* Read a line and dispatch it to the policy handler. */
1824 while (avail_len > 0) {
1825 char c;
1826 if (head->write_avail >= head->writebuf_size - 1) {
1827 error = -ENOMEM;
1828 break;
1829 } else if (get_user(c, buffer)) {
1830 error = -EFAULT;
1831 break;
1832 }
1833 buffer++;
1834 avail_len--;
1835 cp0[head->write_avail++] = c;
1836 if (c != '\n')
1837 continue;
1838 cp0[head->write_avail - 1] = '\0';
1839 head->write_avail = 0;
1840 tomoyo_normalize_line(cp0);
1841 head->write(head);
1842 }
1843 mutex_unlock(&head->io_sem);
1844 return error;
1845 }
1846
1847 /**
1848 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1849 *
1850 * @file: Pointer to "struct file".
1851 *
1852 * Releases memory and returns 0.
1853 *
1854 * Caller looses tomoyo_read_lock().
1855 */
1856 int tomoyo_close_control(struct file *file)
1857 {
1858 struct tomoyo_io_buffer *head = file->private_data;
1859 const bool is_write = !!head->write_buf;
1860
1861 /*
1862 * If the file is /sys/kernel/security/tomoyo/query , decrement the
1863 * observer counter.
1864 */
1865 if (head->type == TOMOYO_QUERY)
1866 atomic_dec(&tomoyo_query_observers);
1867 else
1868 tomoyo_read_unlock(head->reader_idx);
1869 /* Release memory used for policy I/O. */
1870 kfree(head->read_buf);
1871 head->read_buf = NULL;
1872 kfree(head->write_buf);
1873 head->write_buf = NULL;
1874 kfree(head);
1875 head = NULL;
1876 file->private_data = NULL;
1877 if (is_write)
1878 tomoyo_run_gc();
1879 return 0;
1880 }
1881
1882 /**
1883 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1884 */
1885 void tomoyo_check_profile(void)
1886 {
1887 struct tomoyo_domain_info *domain;
1888 const int idx = tomoyo_read_lock();
1889 tomoyo_policy_loaded = true;
1890 /* Check all profiles currently assigned to domains are defined. */
1891 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1892 const u8 profile = domain->profile;
1893 if (tomoyo_profile_ptr[profile])
1894 continue;
1895 panic("Profile %u (used by '%s') not defined.\n",
1896 profile, domain->domainname->name);
1897 }
1898 tomoyo_read_unlock(idx);
1899 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
1900 printk(KERN_INFO "Mandatory Access Control activated.\n");
1901 }
Linux kernel - Deliverables
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