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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * security/tomoyo/domain.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8#include "common.h"
9
10#include <linux/binfmts.h>
11#include <linux/slab.h>
12#include <linux/rculist.h>
13
14/* Variables definitions.*/
15
16/* The initial domain. */
17struct tomoyo_domain_info tomoyo_kernel_domain;
18
19/**
20 * tomoyo_update_policy - Update an entry for exception policy.
21 *
22 * @new_entry: Pointer to "struct tomoyo_acl_info".
23 * @size: Size of @new_entry in bytes.
24 * @param: Pointer to "struct tomoyo_acl_param".
25 * @check_duplicate: Callback function to find duplicated entry.
26 *
27 * Returns 0 on success, negative value otherwise.
28 *
29 * Caller holds tomoyo_read_lock().
30 */
31int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
32 struct tomoyo_acl_param *param,
33 bool (*check_duplicate)(const struct tomoyo_acl_head
34 *,
35 const struct tomoyo_acl_head
36 *))
37{
38 int error = param->is_delete ? -ENOENT : -ENOMEM;
39 struct tomoyo_acl_head *entry;
40 struct list_head *list = param->list;
41
42 if (mutex_lock_interruptible(&tomoyo_policy_lock))
43 return -ENOMEM;
44 list_for_each_entry_rcu(entry, list, list,
45 srcu_read_lock_held(&tomoyo_ss)) {
46 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
47 continue;
48 if (!check_duplicate(entry, new_entry))
49 continue;
50 entry->is_deleted = param->is_delete;
51 error = 0;
52 break;
53 }
54 if (error && !param->is_delete) {
55 entry = tomoyo_commit_ok(new_entry, size);
56 if (entry) {
57 list_add_tail_rcu(&entry->list, list);
58 error = 0;
59 }
60 }
61 mutex_unlock(&tomoyo_policy_lock);
62 return error;
63}
64
65/**
66 * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry.
67 *
68 * @a: Pointer to "struct tomoyo_acl_info".
69 * @b: Pointer to "struct tomoyo_acl_info".
70 *
71 * Returns true if @a == @b, false otherwise.
72 */
73static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
74 const struct tomoyo_acl_info *b)
75{
76 return a->type == b->type && a->cond == b->cond;
77}
78
79/**
80 * tomoyo_update_domain - Update an entry for domain policy.
81 *
82 * @new_entry: Pointer to "struct tomoyo_acl_info".
83 * @size: Size of @new_entry in bytes.
84 * @param: Pointer to "struct tomoyo_acl_param".
85 * @check_duplicate: Callback function to find duplicated entry.
86 * @merge_duplicate: Callback function to merge duplicated entry.
87 *
88 * Returns 0 on success, negative value otherwise.
89 *
90 * Caller holds tomoyo_read_lock().
91 */
92int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
93 struct tomoyo_acl_param *param,
94 bool (*check_duplicate)(const struct tomoyo_acl_info
95 *,
96 const struct tomoyo_acl_info
97 *),
98 bool (*merge_duplicate)(struct tomoyo_acl_info *,
99 struct tomoyo_acl_info *,
100 const bool))
101{
102 const bool is_delete = param->is_delete;
103 int error = is_delete ? -ENOENT : -ENOMEM;
104 struct tomoyo_acl_info *entry;
105 struct list_head * const list = param->list;
106
107 if (param->data[0]) {
108 new_entry->cond = tomoyo_get_condition(param);
109 if (!new_entry->cond)
110 return -EINVAL;
111 /*
112 * Domain transition preference is allowed for only
113 * "file execute" entries.
114 */
115 if (new_entry->cond->transit &&
116 !(new_entry->type == TOMOYO_TYPE_PATH_ACL &&
117 container_of(new_entry, struct tomoyo_path_acl, head)
118 ->perm == 1 << TOMOYO_TYPE_EXECUTE))
119 goto out;
120 }
121 if (mutex_lock_interruptible(&tomoyo_policy_lock))
122 goto out;
123 list_for_each_entry_rcu(entry, list, list,
124 srcu_read_lock_held(&tomoyo_ss)) {
125 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
126 continue;
127 if (!tomoyo_same_acl_head(entry, new_entry) ||
128 !check_duplicate(entry, new_entry))
129 continue;
130 if (merge_duplicate)
131 entry->is_deleted = merge_duplicate(entry, new_entry,
132 is_delete);
133 else
134 entry->is_deleted = is_delete;
135 error = 0;
136 break;
137 }
138 if (error && !is_delete) {
139 entry = tomoyo_commit_ok(new_entry, size);
140 if (entry) {
141 list_add_tail_rcu(&entry->list, list);
142 error = 0;
143 }
144 }
145 mutex_unlock(&tomoyo_policy_lock);
146out:
147 tomoyo_put_condition(new_entry->cond);
148 return error;
149}
150
151/**
152 * tomoyo_check_acl - Do permission check.
153 *
154 * @r: Pointer to "struct tomoyo_request_info".
155 * @check_entry: Callback function to check type specific parameters.
156 *
157 * Returns 0 on success, negative value otherwise.
158 *
159 * Caller holds tomoyo_read_lock().
160 */
161void tomoyo_check_acl(struct tomoyo_request_info *r,
162 bool (*check_entry)(struct tomoyo_request_info *,
163 const struct tomoyo_acl_info *))
164{
165 const struct tomoyo_domain_info *domain = r->domain;
166 struct tomoyo_acl_info *ptr;
167 const struct list_head *list = &domain->acl_info_list;
168 u16 i = 0;
169
170retry:
171 list_for_each_entry_rcu(ptr, list, list,
172 srcu_read_lock_held(&tomoyo_ss)) {
173 if (ptr->is_deleted || ptr->type != r->param_type)
174 continue;
175 if (!check_entry(r, ptr))
176 continue;
177 if (!tomoyo_condition(r, ptr->cond))
178 continue;
179 r->matched_acl = ptr;
180 r->granted = true;
181 return;
182 }
183 for (; i < TOMOYO_MAX_ACL_GROUPS; i++) {
184 if (!test_bit(i, domain->group))
185 continue;
186 list = &domain->ns->acl_group[i++];
187 goto retry;
188 }
189 r->granted = false;
190}
191
192/* The list for "struct tomoyo_domain_info". */
193LIST_HEAD(tomoyo_domain_list);
194
195/**
196 * tomoyo_last_word - Get last component of a domainname.
197 *
198 * @name: Domainname to check.
199 *
200 * Returns the last word of @domainname.
201 */
202static const char *tomoyo_last_word(const char *name)
203{
204 const char *cp = strrchr(name, ' ');
205
206 if (cp)
207 return cp + 1;
208 return name;
209}
210
211/**
212 * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry.
213 *
214 * @a: Pointer to "struct tomoyo_acl_head".
215 * @b: Pointer to "struct tomoyo_acl_head".
216 *
217 * Returns true if @a == @b, false otherwise.
218 */
219static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a,
220 const struct tomoyo_acl_head *b)
221{
222 const struct tomoyo_transition_control *p1 = container_of(a,
223 typeof(*p1),
224 head);
225 const struct tomoyo_transition_control *p2 = container_of(b,
226 typeof(*p2),
227 head);
228
229 return p1->type == p2->type && p1->is_last_name == p2->is_last_name
230 && p1->domainname == p2->domainname
231 && p1->program == p2->program;
232}
233
234/**
235 * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list.
236 *
237 * @param: Pointer to "struct tomoyo_acl_param".
238 * @type: Type of this entry.
239 *
240 * Returns 0 on success, negative value otherwise.
241 */
242int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
243 const u8 type)
244{
245 struct tomoyo_transition_control e = { .type = type };
246 int error = param->is_delete ? -ENOENT : -ENOMEM;
247 char *program = param->data;
248 char *domainname = strstr(program, " from ");
249
250 if (domainname) {
251 *domainname = '\0';
252 domainname += 6;
253 } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP ||
254 type == TOMOYO_TRANSITION_CONTROL_KEEP) {
255 domainname = program;
256 program = NULL;
257 }
258 if (program && strcmp(program, "any")) {
259 if (!tomoyo_correct_path(program))
260 return -EINVAL;
261 e.program = tomoyo_get_name(program);
262 if (!e.program)
263 goto out;
264 }
265 if (domainname && strcmp(domainname, "any")) {
266 if (!tomoyo_correct_domain(domainname)) {
267 if (!tomoyo_correct_path(domainname))
268 goto out;
269 e.is_last_name = true;
270 }
271 e.domainname = tomoyo_get_name(domainname);
272 if (!e.domainname)
273 goto out;
274 }
275 param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
276 error = tomoyo_update_policy(&e.head, sizeof(e), param,
277 tomoyo_same_transition_control);
278out:
279 tomoyo_put_name(e.domainname);
280 tomoyo_put_name(e.program);
281 return error;
282}
283
284/**
285 * tomoyo_scan_transition - Try to find specific domain transition type.
286 *
287 * @list: Pointer to "struct list_head".
288 * @domainname: The name of current domain.
289 * @program: The name of requested program.
290 * @last_name: The last component of @domainname.
291 * @type: One of values in "enum tomoyo_transition_type".
292 *
293 * Returns true if found one, false otherwise.
294 *
295 * Caller holds tomoyo_read_lock().
296 */
297static inline bool tomoyo_scan_transition
298(const struct list_head *list, const struct tomoyo_path_info *domainname,
299 const struct tomoyo_path_info *program, const char *last_name,
300 const enum tomoyo_transition_type type)
301{
302 const struct tomoyo_transition_control *ptr;
303
304 list_for_each_entry_rcu(ptr, list, head.list,
305 srcu_read_lock_held(&tomoyo_ss)) {
306 if (ptr->head.is_deleted || ptr->type != type)
307 continue;
308 if (ptr->domainname) {
309 if (!ptr->is_last_name) {
310 if (ptr->domainname != domainname)
311 continue;
312 } else {
313 /*
314 * Use direct strcmp() since this is
315 * unlikely used.
316 */
317 if (strcmp(ptr->domainname->name, last_name))
318 continue;
319 }
320 }
321 if (ptr->program && tomoyo_pathcmp(ptr->program, program))
322 continue;
323 return true;
324 }
325 return false;
326}
327
328/**
329 * tomoyo_transition_type - Get domain transition type.
330 *
331 * @ns: Pointer to "struct tomoyo_policy_namespace".
332 * @domainname: The name of current domain.
333 * @program: The name of requested program.
334 *
335 * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
336 * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
337 * executing @program reinitializes domain transition within that namespace,
338 * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
339 * others otherwise.
340 *
341 * Caller holds tomoyo_read_lock().
342 */
343static enum tomoyo_transition_type tomoyo_transition_type
344(const struct tomoyo_policy_namespace *ns,
345 const struct tomoyo_path_info *domainname,
346 const struct tomoyo_path_info *program)
347{
348 const char *last_name = tomoyo_last_word(domainname->name);
349 enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
350
351 while (type < TOMOYO_MAX_TRANSITION_TYPE) {
352 const struct list_head * const list =
353 &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
354
355 if (!tomoyo_scan_transition(list, domainname, program,
356 last_name, type)) {
357 type++;
358 continue;
359 }
360 if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
361 type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
362 break;
363 /*
364 * Do not check for reset_domain if no_reset_domain matched.
365 * Do not check for initialize_domain if no_initialize_domain
366 * matched.
367 */
368 type++;
369 type++;
370 }
371 return type;
372}
373
374/**
375 * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry.
376 *
377 * @a: Pointer to "struct tomoyo_acl_head".
378 * @b: Pointer to "struct tomoyo_acl_head".
379 *
380 * Returns true if @a == @b, false otherwise.
381 */
382static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a,
383 const struct tomoyo_acl_head *b)
384{
385 const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1),
386 head);
387 const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2),
388 head);
389
390 return p1->original_name == p2->original_name &&
391 p1->aggregated_name == p2->aggregated_name;
392}
393
394/**
395 * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list.
396 *
397 * @param: Pointer to "struct tomoyo_acl_param".
398 *
399 * Returns 0 on success, negative value otherwise.
400 *
401 * Caller holds tomoyo_read_lock().
402 */
403int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
404{
405 struct tomoyo_aggregator e = { };
406 int error = param->is_delete ? -ENOENT : -ENOMEM;
407 const char *original_name = tomoyo_read_token(param);
408 const char *aggregated_name = tomoyo_read_token(param);
409
410 if (!tomoyo_correct_word(original_name) ||
411 !tomoyo_correct_path(aggregated_name))
412 return -EINVAL;
413 e.original_name = tomoyo_get_name(original_name);
414 e.aggregated_name = tomoyo_get_name(aggregated_name);
415 if (!e.original_name || !e.aggregated_name ||
416 e.aggregated_name->is_patterned) /* No patterns allowed. */
417 goto out;
418 param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR];
419 error = tomoyo_update_policy(&e.head, sizeof(e), param,
420 tomoyo_same_aggregator);
421out:
422 tomoyo_put_name(e.original_name);
423 tomoyo_put_name(e.aggregated_name);
424 return error;
425}
426
427/**
428 * tomoyo_find_namespace - Find specified namespace.
429 *
430 * @name: Name of namespace to find.
431 * @len: Length of @name.
432 *
433 * Returns pointer to "struct tomoyo_policy_namespace" if found,
434 * NULL otherwise.
435 *
436 * Caller holds tomoyo_read_lock().
437 */
438static struct tomoyo_policy_namespace *tomoyo_find_namespace
439(const char *name, const unsigned int len)
440{
441 struct tomoyo_policy_namespace *ns;
442
443 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
444 if (strncmp(name, ns->name, len) ||
445 (name[len] && name[len] != ' '))
446 continue;
447 return ns;
448 }
449 return NULL;
450}
451
452/**
453 * tomoyo_assign_namespace - Create a new namespace.
454 *
455 * @domainname: Name of namespace to create.
456 *
457 * Returns pointer to "struct tomoyo_policy_namespace" on success,
458 * NULL otherwise.
459 *
460 * Caller holds tomoyo_read_lock().
461 */
462struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
463{
464 struct tomoyo_policy_namespace *ptr;
465 struct tomoyo_policy_namespace *entry;
466 const char *cp = domainname;
467 unsigned int len = 0;
468
469 while (*cp && *cp++ != ' ')
470 len++;
471 ptr = tomoyo_find_namespace(domainname, len);
472 if (ptr)
473 return ptr;
474 if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
475 return NULL;
476 entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS | __GFP_NOWARN);
477 if (mutex_lock_interruptible(&tomoyo_policy_lock))
478 goto out;
479 ptr = tomoyo_find_namespace(domainname, len);
480 if (!ptr && tomoyo_memory_ok(entry)) {
481 char *name = (char *) (entry + 1);
482
483 ptr = entry;
484 memmove(name, domainname, len);
485 name[len] = '\0';
486 entry->name = name;
487 tomoyo_init_policy_namespace(entry);
488 entry = NULL;
489 }
490 mutex_unlock(&tomoyo_policy_lock);
491out:
492 kfree(entry);
493 return ptr;
494}
495
496/**
497 * tomoyo_namespace_jump - Check for namespace jump.
498 *
499 * @domainname: Name of domain.
500 *
501 * Returns true if namespace differs, false otherwise.
502 */
503static bool tomoyo_namespace_jump(const char *domainname)
504{
505 const char *namespace = tomoyo_current_namespace()->name;
506 const int len = strlen(namespace);
507
508 return strncmp(domainname, namespace, len) ||
509 (domainname[len] && domainname[len] != ' ');
510}
511
512/**
513 * tomoyo_assign_domain - Create a domain or a namespace.
514 *
515 * @domainname: The name of domain.
516 * @transit: True if transit to domain found or created.
517 *
518 * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
519 *
520 * Caller holds tomoyo_read_lock().
521 */
522struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
523 const bool transit)
524{
525 struct tomoyo_domain_info e = { };
526 struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
527 bool created = false;
528
529 if (entry) {
530 if (transit) {
531 /*
532 * Since namespace is created at runtime, profiles may
533 * not be created by the moment the process transits to
534 * that domain. Do not perform domain transition if
535 * profile for that domain is not yet created.
536 */
537 if (tomoyo_policy_loaded &&
538 !entry->ns->profile_ptr[entry->profile])
539 return NULL;
540 }
541 return entry;
542 }
543 /* Requested domain does not exist. */
544 /* Don't create requested domain if domainname is invalid. */
545 if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
546 !tomoyo_correct_domain(domainname))
547 return NULL;
548 /*
549 * Since definition of profiles and acl_groups may differ across
550 * namespaces, do not inherit "use_profile" and "use_group" settings
551 * by automatically creating requested domain upon domain transition.
552 */
553 if (transit && tomoyo_namespace_jump(domainname))
554 return NULL;
555 e.ns = tomoyo_assign_namespace(domainname);
556 if (!e.ns)
557 return NULL;
558 /*
559 * "use_profile" and "use_group" settings for automatically created
560 * domains are inherited from current domain. These are 0 for manually
561 * created domains.
562 */
563 if (transit) {
564 const struct tomoyo_domain_info *domain = tomoyo_domain();
565
566 e.profile = domain->profile;
567 memcpy(e.group, domain->group, sizeof(e.group));
568 }
569 e.domainname = tomoyo_get_name(domainname);
570 if (!e.domainname)
571 return NULL;
572 if (mutex_lock_interruptible(&tomoyo_policy_lock))
573 goto out;
574 entry = tomoyo_find_domain(domainname);
575 if (!entry) {
576 entry = tomoyo_commit_ok(&e, sizeof(e));
577 if (entry) {
578 INIT_LIST_HEAD(&entry->acl_info_list);
579 list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
580 created = true;
581 }
582 }
583 mutex_unlock(&tomoyo_policy_lock);
584out:
585 tomoyo_put_name(e.domainname);
586 if (entry && transit) {
587 if (created) {
588 struct tomoyo_request_info r;
589 int i;
590
591 tomoyo_init_request_info(&r, entry,
592 TOMOYO_MAC_FILE_EXECUTE);
593 r.granted = false;
594 tomoyo_write_log(&r, "use_profile %u\n",
595 entry->profile);
596 for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
597 if (test_bit(i, entry->group))
598 tomoyo_write_log(&r, "use_group %u\n",
599 i);
600 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
601 }
602 }
603 return entry;
604}
605
606/**
607 * tomoyo_environ - Check permission for environment variable names.
608 *
609 * @ee: Pointer to "struct tomoyo_execve".
610 *
611 * Returns 0 on success, negative value otherwise.
612 */
613static int tomoyo_environ(struct tomoyo_execve *ee)
614{
615 struct tomoyo_request_info *r = &ee->r;
616 struct linux_binprm *bprm = ee->bprm;
617 /* env_page.data is allocated by tomoyo_dump_page(). */
618 struct tomoyo_page_dump env_page = { };
619 char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
620 int arg_len = 0;
621 unsigned long pos = bprm->p;
622 int offset = pos % PAGE_SIZE;
623 int argv_count = bprm->argc;
624 int envp_count = bprm->envc;
625 int error = -ENOMEM;
626
627 ee->r.type = TOMOYO_MAC_ENVIRON;
628 ee->r.profile = r->domain->profile;
629 ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
630 TOMOYO_MAC_ENVIRON);
631 if (!r->mode || !envp_count)
632 return 0;
633 arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
634 if (!arg_ptr)
635 goto out;
636 while (error == -ENOMEM) {
637 if (!tomoyo_dump_page(bprm, pos, &env_page))
638 goto out;
639 pos += PAGE_SIZE - offset;
640 /* Read. */
641 while (argv_count && offset < PAGE_SIZE) {
642 if (!env_page.data[offset++])
643 argv_count--;
644 }
645 if (argv_count) {
646 offset = 0;
647 continue;
648 }
649 while (offset < PAGE_SIZE) {
650 const unsigned char c = env_page.data[offset++];
651
652 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
653 if (c == '=') {
654 arg_ptr[arg_len++] = '\0';
655 } else if (c == '\\') {
656 arg_ptr[arg_len++] = '\\';
657 arg_ptr[arg_len++] = '\\';
658 } else if (c > ' ' && c < 127) {
659 arg_ptr[arg_len++] = c;
660 } else {
661 arg_ptr[arg_len++] = '\\';
662 arg_ptr[arg_len++] = (c >> 6) + '0';
663 arg_ptr[arg_len++]
664 = ((c >> 3) & 7) + '0';
665 arg_ptr[arg_len++] = (c & 7) + '0';
666 }
667 } else {
668 arg_ptr[arg_len] = '\0';
669 }
670 if (c)
671 continue;
672 if (tomoyo_env_perm(r, arg_ptr)) {
673 error = -EPERM;
674 break;
675 }
676 if (!--envp_count) {
677 error = 0;
678 break;
679 }
680 arg_len = 0;
681 }
682 offset = 0;
683 }
684out:
685 if (r->mode != TOMOYO_CONFIG_ENFORCING)
686 error = 0;
687 kfree(env_page.data);
688 kfree(arg_ptr);
689 return error;
690}
691
692/**
693 * tomoyo_find_next_domain - Find a domain.
694 *
695 * @bprm: Pointer to "struct linux_binprm".
696 *
697 * Returns 0 on success, negative value otherwise.
698 *
699 * Caller holds tomoyo_read_lock().
700 */
701int tomoyo_find_next_domain(struct linux_binprm *bprm)
702{
703 struct tomoyo_domain_info *old_domain = tomoyo_domain();
704 struct tomoyo_domain_info *domain = NULL;
705 const char *original_name = bprm->filename;
706 int retval = -ENOMEM;
707 bool reject_on_transition_failure = false;
708 const struct tomoyo_path_info *candidate;
709 struct tomoyo_path_info exename;
710 struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
711
712 if (!ee)
713 return -ENOMEM;
714 ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
715 if (!ee->tmp) {
716 kfree(ee);
717 return -ENOMEM;
718 }
719 /* ee->dump->data is allocated by tomoyo_dump_page(). */
720 tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
721 ee->r.ee = ee;
722 ee->bprm = bprm;
723 ee->r.obj = &ee->obj;
724 ee->obj.path1 = bprm->file->f_path;
725 /* Get symlink's pathname of program. */
726 retval = -ENOENT;
727 exename.name = tomoyo_realpath_nofollow(original_name);
728 if (!exename.name)
729 goto out;
730 tomoyo_fill_path_info(&exename);
731retry:
732 /* Check 'aggregator' directive. */
733 {
734 struct tomoyo_aggregator *ptr;
735 struct list_head *list =
736 &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
737
738 /* Check 'aggregator' directive. */
739 candidate = &exename;
740 list_for_each_entry_rcu(ptr, list, head.list,
741 srcu_read_lock_held(&tomoyo_ss)) {
742 if (ptr->head.is_deleted ||
743 !tomoyo_path_matches_pattern(&exename,
744 ptr->original_name))
745 continue;
746 candidate = ptr->aggregated_name;
747 break;
748 }
749 }
750
751 /* Check execute permission. */
752 retval = tomoyo_execute_permission(&ee->r, candidate);
753 if (retval == TOMOYO_RETRY_REQUEST)
754 goto retry;
755 if (retval < 0)
756 goto out;
757 /*
758 * To be able to specify domainnames with wildcards, use the
759 * pathname specified in the policy (which may contain
760 * wildcard) rather than the pathname passed to execve()
761 * (which never contains wildcard).
762 */
763 if (ee->r.param.path.matched_path)
764 candidate = ee->r.param.path.matched_path;
765
766 /*
767 * Check for domain transition preference if "file execute" matched.
768 * If preference is given, make execve() fail if domain transition
769 * has failed, for domain transition preference should be used with
770 * destination domain defined.
771 */
772 if (ee->transition) {
773 const char *domainname = ee->transition->name;
774
775 reject_on_transition_failure = true;
776 if (!strcmp(domainname, "keep"))
777 goto force_keep_domain;
778 if (!strcmp(domainname, "child"))
779 goto force_child_domain;
780 if (!strcmp(domainname, "reset"))
781 goto force_reset_domain;
782 if (!strcmp(domainname, "initialize"))
783 goto force_initialize_domain;
784 if (!strcmp(domainname, "parent")) {
785 char *cp;
786
787 strncpy(ee->tmp, old_domain->domainname->name,
788 TOMOYO_EXEC_TMPSIZE - 1);
789 cp = strrchr(ee->tmp, ' ');
790 if (cp)
791 *cp = '\0';
792 } else if (*domainname == '<')
793 strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1);
794 else
795 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
796 old_domain->domainname->name, domainname);
797 goto force_jump_domain;
798 }
799 /*
800 * No domain transition preference specified.
801 * Calculate domain to transit to.
802 */
803 switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
804 candidate)) {
805 case TOMOYO_TRANSITION_CONTROL_RESET:
806force_reset_domain:
807 /* Transit to the root of specified namespace. */
808 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
809 candidate->name);
810 /*
811 * Make execve() fail if domain transition across namespaces
812 * has failed.
813 */
814 reject_on_transition_failure = true;
815 break;
816 case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
817force_initialize_domain:
818 /* Transit to the child of current namespace's root. */
819 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
820 old_domain->ns->name, candidate->name);
821 break;
822 case TOMOYO_TRANSITION_CONTROL_KEEP:
823force_keep_domain:
824 /* Keep current domain. */
825 domain = old_domain;
826 break;
827 default:
828 if (old_domain == &tomoyo_kernel_domain &&
829 !tomoyo_policy_loaded) {
830 /*
831 * Needn't to transit from kernel domain before
832 * starting /sbin/init. But transit from kernel domain
833 * if executing initializers because they might start
834 * before /sbin/init.
835 */
836 domain = old_domain;
837 break;
838 }
839force_child_domain:
840 /* Normal domain transition. */
841 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
842 old_domain->domainname->name, candidate->name);
843 break;
844 }
845force_jump_domain:
846 if (!domain)
847 domain = tomoyo_assign_domain(ee->tmp, true);
848 if (domain)
849 retval = 0;
850 else if (reject_on_transition_failure) {
851 pr_warn("ERROR: Domain '%s' not ready.\n", ee->tmp);
852 retval = -ENOMEM;
853 } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
854 retval = -ENOMEM;
855 else {
856 retval = 0;
857 if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
858 old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
859 ee->r.granted = false;
860 tomoyo_write_log(&ee->r, "%s", tomoyo_dif
861 [TOMOYO_DIF_TRANSITION_FAILED]);
862 pr_warn("ERROR: Domain '%s' not defined.\n", ee->tmp);
863 }
864 }
865 out:
866 if (!domain)
867 domain = old_domain;
868 /* Update reference count on "struct tomoyo_domain_info". */
869 {
870 struct tomoyo_task *s = tomoyo_task(current);
871
872 s->old_domain_info = s->domain_info;
873 s->domain_info = domain;
874 atomic_inc(&domain->users);
875 }
876 kfree(exename.name);
877 if (!retval) {
878 ee->r.domain = domain;
879 retval = tomoyo_environ(ee);
880 }
881 kfree(ee->tmp);
882 kfree(ee->dump.data);
883 kfree(ee);
884 return retval;
885}
886
887/**
888 * tomoyo_dump_page - Dump a page to buffer.
889 *
890 * @bprm: Pointer to "struct linux_binprm".
891 * @pos: Location to dump.
892 * @dump: Pointer to "struct tomoyo_page_dump".
893 *
894 * Returns true on success, false otherwise.
895 */
896bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
897 struct tomoyo_page_dump *dump)
898{
899 struct page *page;
900#ifdef CONFIG_MMU
901 int ret;
902#endif
903
904 /* dump->data is released by tomoyo_find_next_domain(). */
905 if (!dump->data) {
906 dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
907 if (!dump->data)
908 return false;
909 }
910 /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
911#ifdef CONFIG_MMU
912 /*
913 * This is called at execve() time in order to dig around
914 * in the argv/environment of the new proceess
915 * (represented by bprm).
916 */
917 mmap_read_lock(bprm->mm);
918 ret = get_user_pages_remote(bprm->mm, pos, 1,
919 FOLL_FORCE, &page, NULL, NULL);
920 mmap_read_unlock(bprm->mm);
921 if (ret <= 0)
922 return false;
923#else
924 page = bprm->page[pos / PAGE_SIZE];
925#endif
926 if (page != dump->page) {
927 const unsigned int offset = pos % PAGE_SIZE;
928 /*
929 * Maybe kmap()/kunmap() should be used here.
930 * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
931 * So do I.
932 */
933 char *kaddr = kmap_atomic(page);
934
935 dump->page = page;
936 memcpy(dump->data + offset, kaddr + offset,
937 PAGE_SIZE - offset);
938 kunmap_atomic(kaddr);
939 }
940 /* Same with put_arg_page(page) in fs/exec.c */
941#ifdef CONFIG_MMU
942 put_page(page);
943#endif
944 return true;
945}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * security/tomoyo/domain.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8#include "common.h"
9
10#include <linux/binfmts.h>
11#include <linux/slab.h>
12#include <linux/rculist.h>
13
14/* Variables definitions.*/
15
16/* The initial domain. */
17struct tomoyo_domain_info tomoyo_kernel_domain;
18
19/**
20 * tomoyo_update_policy - Update an entry for exception policy.
21 *
22 * @new_entry: Pointer to "struct tomoyo_acl_info".
23 * @size: Size of @new_entry in bytes.
24 * @param: Pointer to "struct tomoyo_acl_param".
25 * @check_duplicate: Callback function to find duplicated entry.
26 *
27 * Returns 0 on success, negative value otherwise.
28 *
29 * Caller holds tomoyo_read_lock().
30 */
31int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
32 struct tomoyo_acl_param *param,
33 bool (*check_duplicate) (const struct tomoyo_acl_head
34 *,
35 const struct tomoyo_acl_head
36 *))
37{
38 int error = param->is_delete ? -ENOENT : -ENOMEM;
39 struct tomoyo_acl_head *entry;
40 struct list_head *list = param->list;
41
42 if (mutex_lock_interruptible(&tomoyo_policy_lock))
43 return -ENOMEM;
44 list_for_each_entry_rcu(entry, list, list) {
45 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
46 continue;
47 if (!check_duplicate(entry, new_entry))
48 continue;
49 entry->is_deleted = param->is_delete;
50 error = 0;
51 break;
52 }
53 if (error && !param->is_delete) {
54 entry = tomoyo_commit_ok(new_entry, size);
55 if (entry) {
56 list_add_tail_rcu(&entry->list, list);
57 error = 0;
58 }
59 }
60 mutex_unlock(&tomoyo_policy_lock);
61 return error;
62}
63
64/**
65 * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry.
66 *
67 * @a: Pointer to "struct tomoyo_acl_info".
68 * @b: Pointer to "struct tomoyo_acl_info".
69 *
70 * Returns true if @a == @b, false otherwise.
71 */
72static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
73 const struct tomoyo_acl_info *b)
74{
75 return a->type == b->type && a->cond == b->cond;
76}
77
78/**
79 * tomoyo_update_domain - Update an entry for domain policy.
80 *
81 * @new_entry: Pointer to "struct tomoyo_acl_info".
82 * @size: Size of @new_entry in bytes.
83 * @param: Pointer to "struct tomoyo_acl_param".
84 * @check_duplicate: Callback function to find duplicated entry.
85 * @merge_duplicate: Callback function to merge duplicated entry.
86 *
87 * Returns 0 on success, negative value otherwise.
88 *
89 * Caller holds tomoyo_read_lock().
90 */
91int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
92 struct tomoyo_acl_param *param,
93 bool (*check_duplicate) (const struct tomoyo_acl_info
94 *,
95 const struct tomoyo_acl_info
96 *),
97 bool (*merge_duplicate) (struct tomoyo_acl_info *,
98 struct tomoyo_acl_info *,
99 const bool))
100{
101 const bool is_delete = param->is_delete;
102 int error = is_delete ? -ENOENT : -ENOMEM;
103 struct tomoyo_acl_info *entry;
104 struct list_head * const list = param->list;
105
106 if (param->data[0]) {
107 new_entry->cond = tomoyo_get_condition(param);
108 if (!new_entry->cond)
109 return -EINVAL;
110 /*
111 * Domain transition preference is allowed for only
112 * "file execute" entries.
113 */
114 if (new_entry->cond->transit &&
115 !(new_entry->type == TOMOYO_TYPE_PATH_ACL &&
116 container_of(new_entry, struct tomoyo_path_acl, head)
117 ->perm == 1 << TOMOYO_TYPE_EXECUTE))
118 goto out;
119 }
120 if (mutex_lock_interruptible(&tomoyo_policy_lock))
121 goto out;
122 list_for_each_entry_rcu(entry, list, list) {
123 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
124 continue;
125 if (!tomoyo_same_acl_head(entry, new_entry) ||
126 !check_duplicate(entry, new_entry))
127 continue;
128 if (merge_duplicate)
129 entry->is_deleted = merge_duplicate(entry, new_entry,
130 is_delete);
131 else
132 entry->is_deleted = is_delete;
133 error = 0;
134 break;
135 }
136 if (error && !is_delete) {
137 entry = tomoyo_commit_ok(new_entry, size);
138 if (entry) {
139 list_add_tail_rcu(&entry->list, list);
140 error = 0;
141 }
142 }
143 mutex_unlock(&tomoyo_policy_lock);
144out:
145 tomoyo_put_condition(new_entry->cond);
146 return error;
147}
148
149/**
150 * tomoyo_check_acl - Do permission check.
151 *
152 * @r: Pointer to "struct tomoyo_request_info".
153 * @check_entry: Callback function to check type specific parameters.
154 *
155 * Returns 0 on success, negative value otherwise.
156 *
157 * Caller holds tomoyo_read_lock().
158 */
159void tomoyo_check_acl(struct tomoyo_request_info *r,
160 bool (*check_entry) (struct tomoyo_request_info *,
161 const struct tomoyo_acl_info *))
162{
163 const struct tomoyo_domain_info *domain = r->domain;
164 struct tomoyo_acl_info *ptr;
165 bool retried = false;
166 const struct list_head *list = &domain->acl_info_list;
167
168retry:
169 list_for_each_entry_rcu(ptr, list, list) {
170 if (ptr->is_deleted || ptr->type != r->param_type)
171 continue;
172 if (!check_entry(r, ptr))
173 continue;
174 if (!tomoyo_condition(r, ptr->cond))
175 continue;
176 r->matched_acl = ptr;
177 r->granted = true;
178 return;
179 }
180 if (!retried) {
181 retried = true;
182 list = &domain->ns->acl_group[domain->group];
183 goto retry;
184 }
185 r->granted = false;
186}
187
188/* The list for "struct tomoyo_domain_info". */
189LIST_HEAD(tomoyo_domain_list);
190
191/**
192 * tomoyo_last_word - Get last component of a domainname.
193 *
194 * @name: Domainname to check.
195 *
196 * Returns the last word of @domainname.
197 */
198static const char *tomoyo_last_word(const char *name)
199{
200 const char *cp = strrchr(name, ' ');
201 if (cp)
202 return cp + 1;
203 return name;
204}
205
206/**
207 * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry.
208 *
209 * @a: Pointer to "struct tomoyo_acl_head".
210 * @b: Pointer to "struct tomoyo_acl_head".
211 *
212 * Returns true if @a == @b, false otherwise.
213 */
214static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a,
215 const struct tomoyo_acl_head *b)
216{
217 const struct tomoyo_transition_control *p1 = container_of(a,
218 typeof(*p1),
219 head);
220 const struct tomoyo_transition_control *p2 = container_of(b,
221 typeof(*p2),
222 head);
223 return p1->type == p2->type && p1->is_last_name == p2->is_last_name
224 && p1->domainname == p2->domainname
225 && p1->program == p2->program;
226}
227
228/**
229 * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list.
230 *
231 * @param: Pointer to "struct tomoyo_acl_param".
232 * @type: Type of this entry.
233 *
234 * Returns 0 on success, negative value otherwise.
235 */
236int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
237 const u8 type)
238{
239 struct tomoyo_transition_control e = { .type = type };
240 int error = param->is_delete ? -ENOENT : -ENOMEM;
241 char *program = param->data;
242 char *domainname = strstr(program, " from ");
243 if (domainname) {
244 *domainname = '\0';
245 domainname += 6;
246 } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP ||
247 type == TOMOYO_TRANSITION_CONTROL_KEEP) {
248 domainname = program;
249 program = NULL;
250 }
251 if (program && strcmp(program, "any")) {
252 if (!tomoyo_correct_path(program))
253 return -EINVAL;
254 e.program = tomoyo_get_name(program);
255 if (!e.program)
256 goto out;
257 }
258 if (domainname && strcmp(domainname, "any")) {
259 if (!tomoyo_correct_domain(domainname)) {
260 if (!tomoyo_correct_path(domainname))
261 goto out;
262 e.is_last_name = true;
263 }
264 e.domainname = tomoyo_get_name(domainname);
265 if (!e.domainname)
266 goto out;
267 }
268 param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
269 error = tomoyo_update_policy(&e.head, sizeof(e), param,
270 tomoyo_same_transition_control);
271out:
272 tomoyo_put_name(e.domainname);
273 tomoyo_put_name(e.program);
274 return error;
275}
276
277/**
278 * tomoyo_scan_transition - Try to find specific domain transition type.
279 *
280 * @list: Pointer to "struct list_head".
281 * @domainname: The name of current domain.
282 * @program: The name of requested program.
283 * @last_name: The last component of @domainname.
284 * @type: One of values in "enum tomoyo_transition_type".
285 *
286 * Returns true if found one, false otherwise.
287 *
288 * Caller holds tomoyo_read_lock().
289 */
290static inline bool tomoyo_scan_transition
291(const struct list_head *list, const struct tomoyo_path_info *domainname,
292 const struct tomoyo_path_info *program, const char *last_name,
293 const enum tomoyo_transition_type type)
294{
295 const struct tomoyo_transition_control *ptr;
296 list_for_each_entry_rcu(ptr, list, head.list) {
297 if (ptr->head.is_deleted || ptr->type != type)
298 continue;
299 if (ptr->domainname) {
300 if (!ptr->is_last_name) {
301 if (ptr->domainname != domainname)
302 continue;
303 } else {
304 /*
305 * Use direct strcmp() since this is
306 * unlikely used.
307 */
308 if (strcmp(ptr->domainname->name, last_name))
309 continue;
310 }
311 }
312 if (ptr->program && tomoyo_pathcmp(ptr->program, program))
313 continue;
314 return true;
315 }
316 return false;
317}
318
319/**
320 * tomoyo_transition_type - Get domain transition type.
321 *
322 * @ns: Pointer to "struct tomoyo_policy_namespace".
323 * @domainname: The name of current domain.
324 * @program: The name of requested program.
325 *
326 * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
327 * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
328 * executing @program reinitializes domain transition within that namespace,
329 * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
330 * others otherwise.
331 *
332 * Caller holds tomoyo_read_lock().
333 */
334static enum tomoyo_transition_type tomoyo_transition_type
335(const struct tomoyo_policy_namespace *ns,
336 const struct tomoyo_path_info *domainname,
337 const struct tomoyo_path_info *program)
338{
339 const char *last_name = tomoyo_last_word(domainname->name);
340 enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
341 while (type < TOMOYO_MAX_TRANSITION_TYPE) {
342 const struct list_head * const list =
343 &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
344 if (!tomoyo_scan_transition(list, domainname, program,
345 last_name, type)) {
346 type++;
347 continue;
348 }
349 if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
350 type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
351 break;
352 /*
353 * Do not check for reset_domain if no_reset_domain matched.
354 * Do not check for initialize_domain if no_initialize_domain
355 * matched.
356 */
357 type++;
358 type++;
359 }
360 return type;
361}
362
363/**
364 * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry.
365 *
366 * @a: Pointer to "struct tomoyo_acl_head".
367 * @b: Pointer to "struct tomoyo_acl_head".
368 *
369 * Returns true if @a == @b, false otherwise.
370 */
371static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a,
372 const struct tomoyo_acl_head *b)
373{
374 const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1),
375 head);
376 const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2),
377 head);
378 return p1->original_name == p2->original_name &&
379 p1->aggregated_name == p2->aggregated_name;
380}
381
382/**
383 * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list.
384 *
385 * @param: Pointer to "struct tomoyo_acl_param".
386 *
387 * Returns 0 on success, negative value otherwise.
388 *
389 * Caller holds tomoyo_read_lock().
390 */
391int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
392{
393 struct tomoyo_aggregator e = { };
394 int error = param->is_delete ? -ENOENT : -ENOMEM;
395 const char *original_name = tomoyo_read_token(param);
396 const char *aggregated_name = tomoyo_read_token(param);
397 if (!tomoyo_correct_word(original_name) ||
398 !tomoyo_correct_path(aggregated_name))
399 return -EINVAL;
400 e.original_name = tomoyo_get_name(original_name);
401 e.aggregated_name = tomoyo_get_name(aggregated_name);
402 if (!e.original_name || !e.aggregated_name ||
403 e.aggregated_name->is_patterned) /* No patterns allowed. */
404 goto out;
405 param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR];
406 error = tomoyo_update_policy(&e.head, sizeof(e), param,
407 tomoyo_same_aggregator);
408out:
409 tomoyo_put_name(e.original_name);
410 tomoyo_put_name(e.aggregated_name);
411 return error;
412}
413
414/**
415 * tomoyo_find_namespace - Find specified namespace.
416 *
417 * @name: Name of namespace to find.
418 * @len: Length of @name.
419 *
420 * Returns pointer to "struct tomoyo_policy_namespace" if found,
421 * NULL otherwise.
422 *
423 * Caller holds tomoyo_read_lock().
424 */
425static struct tomoyo_policy_namespace *tomoyo_find_namespace
426(const char *name, const unsigned int len)
427{
428 struct tomoyo_policy_namespace *ns;
429 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
430 if (strncmp(name, ns->name, len) ||
431 (name[len] && name[len] != ' '))
432 continue;
433 return ns;
434 }
435 return NULL;
436}
437
438/**
439 * tomoyo_assign_namespace - Create a new namespace.
440 *
441 * @domainname: Name of namespace to create.
442 *
443 * Returns pointer to "struct tomoyo_policy_namespace" on success,
444 * NULL otherwise.
445 *
446 * Caller holds tomoyo_read_lock().
447 */
448struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
449{
450 struct tomoyo_policy_namespace *ptr;
451 struct tomoyo_policy_namespace *entry;
452 const char *cp = domainname;
453 unsigned int len = 0;
454 while (*cp && *cp++ != ' ')
455 len++;
456 ptr = tomoyo_find_namespace(domainname, len);
457 if (ptr)
458 return ptr;
459 if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
460 return NULL;
461 entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS);
462 if (!entry)
463 return NULL;
464 if (mutex_lock_interruptible(&tomoyo_policy_lock))
465 goto out;
466 ptr = tomoyo_find_namespace(domainname, len);
467 if (!ptr && tomoyo_memory_ok(entry)) {
468 char *name = (char *) (entry + 1);
469 ptr = entry;
470 memmove(name, domainname, len);
471 name[len] = '\0';
472 entry->name = name;
473 tomoyo_init_policy_namespace(entry);
474 entry = NULL;
475 }
476 mutex_unlock(&tomoyo_policy_lock);
477out:
478 kfree(entry);
479 return ptr;
480}
481
482/**
483 * tomoyo_namespace_jump - Check for namespace jump.
484 *
485 * @domainname: Name of domain.
486 *
487 * Returns true if namespace differs, false otherwise.
488 */
489static bool tomoyo_namespace_jump(const char *domainname)
490{
491 const char *namespace = tomoyo_current_namespace()->name;
492 const int len = strlen(namespace);
493 return strncmp(domainname, namespace, len) ||
494 (domainname[len] && domainname[len] != ' ');
495}
496
497/**
498 * tomoyo_assign_domain - Create a domain or a namespace.
499 *
500 * @domainname: The name of domain.
501 * @transit: True if transit to domain found or created.
502 *
503 * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
504 *
505 * Caller holds tomoyo_read_lock().
506 */
507struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
508 const bool transit)
509{
510 struct tomoyo_domain_info e = { };
511 struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
512 bool created = false;
513 if (entry) {
514 if (transit) {
515 /*
516 * Since namespace is created at runtime, profiles may
517 * not be created by the moment the process transits to
518 * that domain. Do not perform domain transition if
519 * profile for that domain is not yet created.
520 */
521 if (tomoyo_policy_loaded &&
522 !entry->ns->profile_ptr[entry->profile])
523 return NULL;
524 }
525 return entry;
526 }
527 /* Requested domain does not exist. */
528 /* Don't create requested domain if domainname is invalid. */
529 if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
530 !tomoyo_correct_domain(domainname))
531 return NULL;
532 /*
533 * Since definition of profiles and acl_groups may differ across
534 * namespaces, do not inherit "use_profile" and "use_group" settings
535 * by automatically creating requested domain upon domain transition.
536 */
537 if (transit && tomoyo_namespace_jump(domainname))
538 return NULL;
539 e.ns = tomoyo_assign_namespace(domainname);
540 if (!e.ns)
541 return NULL;
542 /*
543 * "use_profile" and "use_group" settings for automatically created
544 * domains are inherited from current domain. These are 0 for manually
545 * created domains.
546 */
547 if (transit) {
548 const struct tomoyo_domain_info *domain = tomoyo_domain();
549 e.profile = domain->profile;
550 e.group = domain->group;
551 }
552 e.domainname = tomoyo_get_name(domainname);
553 if (!e.domainname)
554 return NULL;
555 if (mutex_lock_interruptible(&tomoyo_policy_lock))
556 goto out;
557 entry = tomoyo_find_domain(domainname);
558 if (!entry) {
559 entry = tomoyo_commit_ok(&e, sizeof(e));
560 if (entry) {
561 INIT_LIST_HEAD(&entry->acl_info_list);
562 list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
563 created = true;
564 }
565 }
566 mutex_unlock(&tomoyo_policy_lock);
567out:
568 tomoyo_put_name(e.domainname);
569 if (entry && transit) {
570 if (created) {
571 struct tomoyo_request_info r;
572 tomoyo_init_request_info(&r, entry,
573 TOMOYO_MAC_FILE_EXECUTE);
574 r.granted = false;
575 tomoyo_write_log(&r, "use_profile %u\n",
576 entry->profile);
577 tomoyo_write_log(&r, "use_group %u\n", entry->group);
578 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
579 }
580 }
581 return entry;
582}
583
584/**
585 * tomoyo_environ - Check permission for environment variable names.
586 *
587 * @ee: Pointer to "struct tomoyo_execve".
588 *
589 * Returns 0 on success, negative value otherwise.
590 */
591static int tomoyo_environ(struct tomoyo_execve *ee)
592{
593 struct tomoyo_request_info *r = &ee->r;
594 struct linux_binprm *bprm = ee->bprm;
595 /* env_page.data is allocated by tomoyo_dump_page(). */
596 struct tomoyo_page_dump env_page = { };
597 char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
598 int arg_len = 0;
599 unsigned long pos = bprm->p;
600 int offset = pos % PAGE_SIZE;
601 int argv_count = bprm->argc;
602 int envp_count = bprm->envc;
603 int error = -ENOMEM;
604
605 ee->r.type = TOMOYO_MAC_ENVIRON;
606 ee->r.profile = r->domain->profile;
607 ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
608 TOMOYO_MAC_ENVIRON);
609 if (!r->mode || !envp_count)
610 return 0;
611 arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
612 if (!arg_ptr)
613 goto out;
614 while (error == -ENOMEM) {
615 if (!tomoyo_dump_page(bprm, pos, &env_page))
616 goto out;
617 pos += PAGE_SIZE - offset;
618 /* Read. */
619 while (argv_count && offset < PAGE_SIZE) {
620 if (!env_page.data[offset++])
621 argv_count--;
622 }
623 if (argv_count) {
624 offset = 0;
625 continue;
626 }
627 while (offset < PAGE_SIZE) {
628 const unsigned char c = env_page.data[offset++];
629
630 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
631 if (c == '=') {
632 arg_ptr[arg_len++] = '\0';
633 } else if (c == '\\') {
634 arg_ptr[arg_len++] = '\\';
635 arg_ptr[arg_len++] = '\\';
636 } else if (c > ' ' && c < 127) {
637 arg_ptr[arg_len++] = c;
638 } else {
639 arg_ptr[arg_len++] = '\\';
640 arg_ptr[arg_len++] = (c >> 6) + '0';
641 arg_ptr[arg_len++]
642 = ((c >> 3) & 7) + '0';
643 arg_ptr[arg_len++] = (c & 7) + '0';
644 }
645 } else {
646 arg_ptr[arg_len] = '\0';
647 }
648 if (c)
649 continue;
650 if (tomoyo_env_perm(r, arg_ptr)) {
651 error = -EPERM;
652 break;
653 }
654 if (!--envp_count) {
655 error = 0;
656 break;
657 }
658 arg_len = 0;
659 }
660 offset = 0;
661 }
662out:
663 if (r->mode != TOMOYO_CONFIG_ENFORCING)
664 error = 0;
665 kfree(env_page.data);
666 kfree(arg_ptr);
667 return error;
668}
669
670/**
671 * tomoyo_find_next_domain - Find a domain.
672 *
673 * @bprm: Pointer to "struct linux_binprm".
674 *
675 * Returns 0 on success, negative value otherwise.
676 *
677 * Caller holds tomoyo_read_lock().
678 */
679int tomoyo_find_next_domain(struct linux_binprm *bprm)
680{
681 struct tomoyo_domain_info *old_domain = tomoyo_domain();
682 struct tomoyo_domain_info *domain = NULL;
683 const char *original_name = bprm->filename;
684 int retval = -ENOMEM;
685 bool reject_on_transition_failure = false;
686 const struct tomoyo_path_info *candidate;
687 struct tomoyo_path_info exename;
688 struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
689
690 if (!ee)
691 return -ENOMEM;
692 ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
693 if (!ee->tmp) {
694 kfree(ee);
695 return -ENOMEM;
696 }
697 /* ee->dump->data is allocated by tomoyo_dump_page(). */
698 tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
699 ee->r.ee = ee;
700 ee->bprm = bprm;
701 ee->r.obj = &ee->obj;
702 ee->obj.path1 = bprm->file->f_path;
703 /* Get symlink's pathname of program. */
704 retval = -ENOENT;
705 exename.name = tomoyo_realpath_nofollow(original_name);
706 if (!exename.name)
707 goto out;
708 tomoyo_fill_path_info(&exename);
709retry:
710 /* Check 'aggregator' directive. */
711 {
712 struct tomoyo_aggregator *ptr;
713 struct list_head *list =
714 &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
715 /* Check 'aggregator' directive. */
716 candidate = &exename;
717 list_for_each_entry_rcu(ptr, list, head.list) {
718 if (ptr->head.is_deleted ||
719 !tomoyo_path_matches_pattern(&exename,
720 ptr->original_name))
721 continue;
722 candidate = ptr->aggregated_name;
723 break;
724 }
725 }
726
727 /* Check execute permission. */
728 retval = tomoyo_execute_permission(&ee->r, candidate);
729 if (retval == TOMOYO_RETRY_REQUEST)
730 goto retry;
731 if (retval < 0)
732 goto out;
733 /*
734 * To be able to specify domainnames with wildcards, use the
735 * pathname specified in the policy (which may contain
736 * wildcard) rather than the pathname passed to execve()
737 * (which never contains wildcard).
738 */
739 if (ee->r.param.path.matched_path)
740 candidate = ee->r.param.path.matched_path;
741
742 /*
743 * Check for domain transition preference if "file execute" matched.
744 * If preference is given, make do_execve() fail if domain transition
745 * has failed, for domain transition preference should be used with
746 * destination domain defined.
747 */
748 if (ee->transition) {
749 const char *domainname = ee->transition->name;
750 reject_on_transition_failure = true;
751 if (!strcmp(domainname, "keep"))
752 goto force_keep_domain;
753 if (!strcmp(domainname, "child"))
754 goto force_child_domain;
755 if (!strcmp(domainname, "reset"))
756 goto force_reset_domain;
757 if (!strcmp(domainname, "initialize"))
758 goto force_initialize_domain;
759 if (!strcmp(domainname, "parent")) {
760 char *cp;
761 strncpy(ee->tmp, old_domain->domainname->name,
762 TOMOYO_EXEC_TMPSIZE - 1);
763 cp = strrchr(ee->tmp, ' ');
764 if (cp)
765 *cp = '\0';
766 } else if (*domainname == '<')
767 strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1);
768 else
769 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
770 old_domain->domainname->name, domainname);
771 goto force_jump_domain;
772 }
773 /*
774 * No domain transition preference specified.
775 * Calculate domain to transit to.
776 */
777 switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
778 candidate)) {
779 case TOMOYO_TRANSITION_CONTROL_RESET:
780force_reset_domain:
781 /* Transit to the root of specified namespace. */
782 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
783 candidate->name);
784 /*
785 * Make do_execve() fail if domain transition across namespaces
786 * has failed.
787 */
788 reject_on_transition_failure = true;
789 break;
790 case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
791force_initialize_domain:
792 /* Transit to the child of current namespace's root. */
793 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
794 old_domain->ns->name, candidate->name);
795 break;
796 case TOMOYO_TRANSITION_CONTROL_KEEP:
797force_keep_domain:
798 /* Keep current domain. */
799 domain = old_domain;
800 break;
801 default:
802 if (old_domain == &tomoyo_kernel_domain &&
803 !tomoyo_policy_loaded) {
804 /*
805 * Needn't to transit from kernel domain before
806 * starting /sbin/init. But transit from kernel domain
807 * if executing initializers because they might start
808 * before /sbin/init.
809 */
810 domain = old_domain;
811 break;
812 }
813force_child_domain:
814 /* Normal domain transition. */
815 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
816 old_domain->domainname->name, candidate->name);
817 break;
818 }
819force_jump_domain:
820 if (!domain)
821 domain = tomoyo_assign_domain(ee->tmp, true);
822 if (domain)
823 retval = 0;
824 else if (reject_on_transition_failure) {
825 printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n",
826 ee->tmp);
827 retval = -ENOMEM;
828 } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
829 retval = -ENOMEM;
830 else {
831 retval = 0;
832 if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
833 old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
834 ee->r.granted = false;
835 tomoyo_write_log(&ee->r, "%s", tomoyo_dif
836 [TOMOYO_DIF_TRANSITION_FAILED]);
837 printk(KERN_WARNING
838 "ERROR: Domain '%s' not defined.\n", ee->tmp);
839 }
840 }
841 out:
842 if (!domain)
843 domain = old_domain;
844 /* Update reference count on "struct tomoyo_domain_info". */
845 atomic_inc(&domain->users);
846 bprm->cred->security = domain;
847 kfree(exename.name);
848 if (!retval) {
849 ee->r.domain = domain;
850 retval = tomoyo_environ(ee);
851 }
852 kfree(ee->tmp);
853 kfree(ee->dump.data);
854 kfree(ee);
855 return retval;
856}
857
858/**
859 * tomoyo_dump_page - Dump a page to buffer.
860 *
861 * @bprm: Pointer to "struct linux_binprm".
862 * @pos: Location to dump.
863 * @dump: Poiner to "struct tomoyo_page_dump".
864 *
865 * Returns true on success, false otherwise.
866 */
867bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
868 struct tomoyo_page_dump *dump)
869{
870 struct page *page;
871
872 /* dump->data is released by tomoyo_find_next_domain(). */
873 if (!dump->data) {
874 dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
875 if (!dump->data)
876 return false;
877 }
878 /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
879#ifdef CONFIG_MMU
880 /*
881 * This is called at execve() time in order to dig around
882 * in the argv/environment of the new proceess
883 * (represented by bprm). 'current' is the process doing
884 * the execve().
885 */
886 if (get_user_pages_remote(current, bprm->mm, pos, 1,
887 FOLL_FORCE, &page, NULL, NULL) <= 0)
888 return false;
889#else
890 page = bprm->page[pos / PAGE_SIZE];
891#endif
892 if (page != dump->page) {
893 const unsigned int offset = pos % PAGE_SIZE;
894 /*
895 * Maybe kmap()/kunmap() should be used here.
896 * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
897 * So do I.
898 */
899 char *kaddr = kmap_atomic(page);
900
901 dump->page = page;
902 memcpy(dump->data + offset, kaddr + offset,
903 PAGE_SIZE - offset);
904 kunmap_atomic(kaddr);
905 }
906 /* Same with put_arg_page(page) in fs/exec.c */
907#ifdef CONFIG_MMU
908 put_page(page);
909#endif
910 return true;
911}