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1/*
2 * security/tomoyo/condition.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7#include "common.h"
8#include <linux/slab.h>
9
10/* List of "struct tomoyo_condition". */
11LIST_HEAD(tomoyo_condition_list);
12
13/**
14 * tomoyo_argv - Check argv[] in "struct linux_binbrm".
15 *
16 * @index: Index number of @arg_ptr.
17 * @arg_ptr: Contents of argv[@index].
18 * @argc: Length of @argv.
19 * @argv: Pointer to "struct tomoyo_argv".
20 * @checked: Set to true if @argv[@index] was found.
21 *
22 * Returns true on success, false otherwise.
23 */
24static bool tomoyo_argv(const unsigned int index, const char *arg_ptr,
25 const int argc, const struct tomoyo_argv *argv,
26 u8 *checked)
27{
28 int i;
29 struct tomoyo_path_info arg;
30 arg.name = arg_ptr;
31 for (i = 0; i < argc; argv++, checked++, i++) {
32 bool result;
33 if (index != argv->index)
34 continue;
35 *checked = 1;
36 tomoyo_fill_path_info(&arg);
37 result = tomoyo_path_matches_pattern(&arg, argv->value);
38 if (argv->is_not)
39 result = !result;
40 if (!result)
41 return false;
42 }
43 return true;
44}
45
46/**
47 * tomoyo_envp - Check envp[] in "struct linux_binbrm".
48 *
49 * @env_name: The name of environment variable.
50 * @env_value: The value of environment variable.
51 * @envc: Length of @envp.
52 * @envp: Pointer to "struct tomoyo_envp".
53 * @checked: Set to true if @envp[@env_name] was found.
54 *
55 * Returns true on success, false otherwise.
56 */
57static bool tomoyo_envp(const char *env_name, const char *env_value,
58 const int envc, const struct tomoyo_envp *envp,
59 u8 *checked)
60{
61 int i;
62 struct tomoyo_path_info name;
63 struct tomoyo_path_info value;
64 name.name = env_name;
65 tomoyo_fill_path_info(&name);
66 value.name = env_value;
67 tomoyo_fill_path_info(&value);
68 for (i = 0; i < envc; envp++, checked++, i++) {
69 bool result;
70 if (!tomoyo_path_matches_pattern(&name, envp->name))
71 continue;
72 *checked = 1;
73 if (envp->value) {
74 result = tomoyo_path_matches_pattern(&value,
75 envp->value);
76 if (envp->is_not)
77 result = !result;
78 } else {
79 result = true;
80 if (!envp->is_not)
81 result = !result;
82 }
83 if (!result)
84 return false;
85 }
86 return true;
87}
88
89/**
90 * tomoyo_scan_bprm - Scan "struct linux_binprm".
91 *
92 * @ee: Pointer to "struct tomoyo_execve".
93 * @argc: Length of @argc.
94 * @argv: Pointer to "struct tomoyo_argv".
95 * @envc: Length of @envp.
96 * @envp: Poiner to "struct tomoyo_envp".
97 *
98 * Returns true on success, false otherwise.
99 */
100static bool tomoyo_scan_bprm(struct tomoyo_execve *ee,
101 const u16 argc, const struct tomoyo_argv *argv,
102 const u16 envc, const struct tomoyo_envp *envp)
103{
104 struct linux_binprm *bprm = ee->bprm;
105 struct tomoyo_page_dump *dump = &ee->dump;
106 char *arg_ptr = ee->tmp;
107 int arg_len = 0;
108 unsigned long pos = bprm->p;
109 int offset = pos % PAGE_SIZE;
110 int argv_count = bprm->argc;
111 int envp_count = bprm->envc;
112 bool result = true;
113 u8 local_checked[32];
114 u8 *checked;
115 if (argc + envc <= sizeof(local_checked)) {
116 checked = local_checked;
117 memset(local_checked, 0, sizeof(local_checked));
118 } else {
119 checked = kzalloc(argc + envc, GFP_NOFS);
120 if (!checked)
121 return false;
122 }
123 while (argv_count || envp_count) {
124 if (!tomoyo_dump_page(bprm, pos, dump)) {
125 result = false;
126 goto out;
127 }
128 pos += PAGE_SIZE - offset;
129 while (offset < PAGE_SIZE) {
130 /* Read. */
131 const char *kaddr = dump->data;
132 const unsigned char c = kaddr[offset++];
133 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
134 if (c == '\\') {
135 arg_ptr[arg_len++] = '\\';
136 arg_ptr[arg_len++] = '\\';
137 } else if (c > ' ' && c < 127) {
138 arg_ptr[arg_len++] = c;
139 } else {
140 arg_ptr[arg_len++] = '\\';
141 arg_ptr[arg_len++] = (c >> 6) + '0';
142 arg_ptr[arg_len++] =
143 ((c >> 3) & 7) + '0';
144 arg_ptr[arg_len++] = (c & 7) + '0';
145 }
146 } else {
147 arg_ptr[arg_len] = '\0';
148 }
149 if (c)
150 continue;
151 /* Check. */
152 if (argv_count) {
153 if (!tomoyo_argv(bprm->argc - argv_count,
154 arg_ptr, argc, argv,
155 checked)) {
156 result = false;
157 break;
158 }
159 argv_count--;
160 } else if (envp_count) {
161 char *cp = strchr(arg_ptr, '=');
162 if (cp) {
163 *cp = '\0';
164 if (!tomoyo_envp(arg_ptr, cp + 1,
165 envc, envp,
166 checked + argc)) {
167 result = false;
168 break;
169 }
170 }
171 envp_count--;
172 } else {
173 break;
174 }
175 arg_len = 0;
176 }
177 offset = 0;
178 if (!result)
179 break;
180 }
181out:
182 if (result) {
183 int i;
184 /* Check not-yet-checked entries. */
185 for (i = 0; i < argc; i++) {
186 if (checked[i])
187 continue;
188 /*
189 * Return true only if all unchecked indexes in
190 * bprm->argv[] are not matched.
191 */
192 if (argv[i].is_not)
193 continue;
194 result = false;
195 break;
196 }
197 for (i = 0; i < envc; envp++, i++) {
198 if (checked[argc + i])
199 continue;
200 /*
201 * Return true only if all unchecked environ variables
202 * in bprm->envp[] are either undefined or not matched.
203 */
204 if ((!envp->value && !envp->is_not) ||
205 (envp->value && envp->is_not))
206 continue;
207 result = false;
208 break;
209 }
210 }
211 if (checked != local_checked)
212 kfree(checked);
213 return result;
214}
215
216/**
217 * tomoyo_scan_exec_realpath - Check "exec.realpath" parameter of "struct tomoyo_condition".
218 *
219 * @file: Pointer to "struct file".
220 * @ptr: Pointer to "struct tomoyo_name_union".
221 * @match: True if "exec.realpath=", false if "exec.realpath!=".
222 *
223 * Returns true on success, false otherwise.
224 */
225static bool tomoyo_scan_exec_realpath(struct file *file,
226 const struct tomoyo_name_union *ptr,
227 const bool match)
228{
229 bool result;
230 struct tomoyo_path_info exe;
231 if (!file)
232 return false;
233 exe.name = tomoyo_realpath_from_path(&file->f_path);
234 if (!exe.name)
235 return false;
236 tomoyo_fill_path_info(&exe);
237 result = tomoyo_compare_name_union(&exe, ptr);
238 kfree(exe.name);
239 return result == match;
240}
241
242/**
243 * tomoyo_get_dqword - tomoyo_get_name() for a quoted string.
244 *
245 * @start: String to save.
246 *
247 * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
248 */
249static const struct tomoyo_path_info *tomoyo_get_dqword(char *start)
250{
251 char *cp = start + strlen(start) - 1;
252 if (cp == start || *start++ != '"' || *cp != '"')
253 return NULL;
254 *cp = '\0';
255 if (*start && !tomoyo_correct_word(start))
256 return NULL;
257 return tomoyo_get_name(start);
258}
259
260/**
261 * tomoyo_parse_name_union_quoted - Parse a quoted word.
262 *
263 * @param: Pointer to "struct tomoyo_acl_param".
264 * @ptr: Pointer to "struct tomoyo_name_union".
265 *
266 * Returns true on success, false otherwise.
267 */
268static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param,
269 struct tomoyo_name_union *ptr)
270{
271 char *filename = param->data;
272 if (*filename == '@')
273 return tomoyo_parse_name_union(param, ptr);
274 ptr->filename = tomoyo_get_dqword(filename);
275 return ptr->filename != NULL;
276}
277
278/**
279 * tomoyo_parse_argv - Parse an argv[] condition part.
280 *
281 * @left: Lefthand value.
282 * @right: Righthand value.
283 * @argv: Pointer to "struct tomoyo_argv".
284 *
285 * Returns true on success, false otherwise.
286 */
287static bool tomoyo_parse_argv(char *left, char *right,
288 struct tomoyo_argv *argv)
289{
290 if (tomoyo_parse_ulong(&argv->index, &left) !=
291 TOMOYO_VALUE_TYPE_DECIMAL || *left++ != ']' || *left)
292 return false;
293 argv->value = tomoyo_get_dqword(right);
294 return argv->value != NULL;
295}
296
297/**
298 * tomoyo_parse_envp - Parse an envp[] condition part.
299 *
300 * @left: Lefthand value.
301 * @right: Righthand value.
302 * @envp: Pointer to "struct tomoyo_envp".
303 *
304 * Returns true on success, false otherwise.
305 */
306static bool tomoyo_parse_envp(char *left, char *right,
307 struct tomoyo_envp *envp)
308{
309 const struct tomoyo_path_info *name;
310 const struct tomoyo_path_info *value;
311 char *cp = left + strlen(left) - 1;
312 if (*cp-- != ']' || *cp != '"')
313 goto out;
314 *cp = '\0';
315 if (!tomoyo_correct_word(left))
316 goto out;
317 name = tomoyo_get_name(left);
318 if (!name)
319 goto out;
320 if (!strcmp(right, "NULL")) {
321 value = NULL;
322 } else {
323 value = tomoyo_get_dqword(right);
324 if (!value) {
325 tomoyo_put_name(name);
326 goto out;
327 }
328 }
329 envp->name = name;
330 envp->value = value;
331 return true;
332out:
333 return false;
334}
335
336/**
337 * tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry.
338 *
339 * @a: Pointer to "struct tomoyo_condition".
340 * @b: Pointer to "struct tomoyo_condition".
341 *
342 * Returns true if @a == @b, false otherwise.
343 */
344static inline bool tomoyo_same_condition(const struct tomoyo_condition *a,
345 const struct tomoyo_condition *b)
346{
347 return a->size == b->size && a->condc == b->condc &&
348 a->numbers_count == b->numbers_count &&
349 a->names_count == b->names_count &&
350 a->argc == b->argc && a->envc == b->envc &&
351 a->grant_log == b->grant_log && a->transit == b->transit &&
352 !memcmp(a + 1, b + 1, a->size - sizeof(*a));
353}
354
355/**
356 * tomoyo_condition_type - Get condition type.
357 *
358 * @word: Keyword string.
359 *
360 * Returns one of values in "enum tomoyo_conditions_index" on success,
361 * TOMOYO_MAX_CONDITION_KEYWORD otherwise.
362 */
363static u8 tomoyo_condition_type(const char *word)
364{
365 u8 i;
366 for (i = 0; i < TOMOYO_MAX_CONDITION_KEYWORD; i++) {
367 if (!strcmp(word, tomoyo_condition_keyword[i]))
368 break;
369 }
370 return i;
371}
372
373/* Define this to enable debug mode. */
374/* #define DEBUG_CONDITION */
375
376#ifdef DEBUG_CONDITION
377#define dprintk printk
378#else
379#define dprintk(...) do { } while (0)
380#endif
381
382/**
383 * tomoyo_commit_condition - Commit "struct tomoyo_condition".
384 *
385 * @entry: Pointer to "struct tomoyo_condition".
386 *
387 * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
388 *
389 * This function merges duplicated entries. This function returns NULL if
390 * @entry is not duplicated but memory quota for policy has exceeded.
391 */
392static struct tomoyo_condition *tomoyo_commit_condition
393(struct tomoyo_condition *entry)
394{
395 struct tomoyo_condition *ptr;
396 bool found = false;
397 if (mutex_lock_interruptible(&tomoyo_policy_lock)) {
398 dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
399 ptr = NULL;
400 found = true;
401 goto out;
402 }
403 list_for_each_entry(ptr, &tomoyo_condition_list, head.list) {
404 if (!tomoyo_same_condition(ptr, entry) ||
405 atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS)
406 continue;
407 /* Same entry found. Share this entry. */
408 atomic_inc(&ptr->head.users);
409 found = true;
410 break;
411 }
412 if (!found) {
413 if (tomoyo_memory_ok(entry)) {
414 atomic_set(&entry->head.users, 1);
415 list_add(&entry->head.list, &tomoyo_condition_list);
416 } else {
417 found = true;
418 ptr = NULL;
419 }
420 }
421 mutex_unlock(&tomoyo_policy_lock);
422out:
423 if (found) {
424 tomoyo_del_condition(&entry->head.list);
425 kfree(entry);
426 entry = ptr;
427 }
428 return entry;
429}
430
431/**
432 * tomoyo_get_transit_preference - Parse domain transition preference for execve().
433 *
434 * @param: Pointer to "struct tomoyo_acl_param".
435 * @e: Pointer to "struct tomoyo_condition".
436 *
437 * Returns the condition string part.
438 */
439static char *tomoyo_get_transit_preference(struct tomoyo_acl_param *param,
440 struct tomoyo_condition *e)
441{
442 char * const pos = param->data;
443 bool flag;
444 if (*pos == '<') {
445 e->transit = tomoyo_get_domainname(param);
446 goto done;
447 }
448 {
449 char *cp = strchr(pos, ' ');
450 if (cp)
451 *cp = '\0';
452 flag = tomoyo_correct_path(pos) || !strcmp(pos, "keep") ||
453 !strcmp(pos, "initialize") || !strcmp(pos, "reset") ||
454 !strcmp(pos, "child") || !strcmp(pos, "parent");
455 if (cp)
456 *cp = ' ';
457 }
458 if (!flag)
459 return pos;
460 e->transit = tomoyo_get_name(tomoyo_read_token(param));
461done:
462 if (e->transit)
463 return param->data;
464 /*
465 * Return a bad read-only condition string that will let
466 * tomoyo_get_condition() return NULL.
467 */
468 return "/";
469}
470
471/**
472 * tomoyo_get_condition - Parse condition part.
473 *
474 * @param: Pointer to "struct tomoyo_acl_param".
475 *
476 * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
477 */
478struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
479{
480 struct tomoyo_condition *entry = NULL;
481 struct tomoyo_condition_element *condp = NULL;
482 struct tomoyo_number_union *numbers_p = NULL;
483 struct tomoyo_name_union *names_p = NULL;
484 struct tomoyo_argv *argv = NULL;
485 struct tomoyo_envp *envp = NULL;
486 struct tomoyo_condition e = { };
487 char * const start_of_string =
488 tomoyo_get_transit_preference(param, &e);
489 char * const end_of_string = start_of_string + strlen(start_of_string);
490 char *pos;
491rerun:
492 pos = start_of_string;
493 while (1) {
494 u8 left = -1;
495 u8 right = -1;
496 char *left_word = pos;
497 char *cp;
498 char *right_word;
499 bool is_not;
500 if (!*left_word)
501 break;
502 /*
503 * Since left-hand condition does not allow use of "path_group"
504 * or "number_group" and environment variable's names do not
505 * accept '=', it is guaranteed that the original line consists
506 * of one or more repetition of $left$operator$right blocks
507 * where "$left is free from '=' and ' '" and "$operator is
508 * either '=' or '!='" and "$right is free from ' '".
509 * Therefore, we can reconstruct the original line at the end
510 * of dry run even if we overwrite $operator with '\0'.
511 */
512 cp = strchr(pos, ' ');
513 if (cp) {
514 *cp = '\0'; /* Will restore later. */
515 pos = cp + 1;
516 } else {
517 pos = "";
518 }
519 right_word = strchr(left_word, '=');
520 if (!right_word || right_word == left_word)
521 goto out;
522 is_not = *(right_word - 1) == '!';
523 if (is_not)
524 *(right_word++ - 1) = '\0'; /* Will restore later. */
525 else if (*(right_word + 1) != '=')
526 *right_word++ = '\0'; /* Will restore later. */
527 else
528 goto out;
529 dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word,
530 is_not ? "!" : "", right_word);
531 if (!strcmp(left_word, "grant_log")) {
532 if (entry) {
533 if (is_not ||
534 entry->grant_log != TOMOYO_GRANTLOG_AUTO)
535 goto out;
536 else if (!strcmp(right_word, "yes"))
537 entry->grant_log = TOMOYO_GRANTLOG_YES;
538 else if (!strcmp(right_word, "no"))
539 entry->grant_log = TOMOYO_GRANTLOG_NO;
540 else
541 goto out;
542 }
543 continue;
544 }
545 if (!strncmp(left_word, "exec.argv[", 10)) {
546 if (!argv) {
547 e.argc++;
548 e.condc++;
549 } else {
550 e.argc--;
551 e.condc--;
552 left = TOMOYO_ARGV_ENTRY;
553 argv->is_not = is_not;
554 if (!tomoyo_parse_argv(left_word + 10,
555 right_word, argv++))
556 goto out;
557 }
558 goto store_value;
559 }
560 if (!strncmp(left_word, "exec.envp[\"", 11)) {
561 if (!envp) {
562 e.envc++;
563 e.condc++;
564 } else {
565 e.envc--;
566 e.condc--;
567 left = TOMOYO_ENVP_ENTRY;
568 envp->is_not = is_not;
569 if (!tomoyo_parse_envp(left_word + 11,
570 right_word, envp++))
571 goto out;
572 }
573 goto store_value;
574 }
575 left = tomoyo_condition_type(left_word);
576 dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word,
577 left);
578 if (left == TOMOYO_MAX_CONDITION_KEYWORD) {
579 if (!numbers_p) {
580 e.numbers_count++;
581 } else {
582 e.numbers_count--;
583 left = TOMOYO_NUMBER_UNION;
584 param->data = left_word;
585 if (*left_word == '@' ||
586 !tomoyo_parse_number_union(param,
587 numbers_p++))
588 goto out;
589 }
590 }
591 if (!condp)
592 e.condc++;
593 else
594 e.condc--;
595 if (left == TOMOYO_EXEC_REALPATH ||
596 left == TOMOYO_SYMLINK_TARGET) {
597 if (!names_p) {
598 e.names_count++;
599 } else {
600 e.names_count--;
601 right = TOMOYO_NAME_UNION;
602 param->data = right_word;
603 if (!tomoyo_parse_name_union_quoted(param,
604 names_p++))
605 goto out;
606 }
607 goto store_value;
608 }
609 right = tomoyo_condition_type(right_word);
610 if (right == TOMOYO_MAX_CONDITION_KEYWORD) {
611 if (!numbers_p) {
612 e.numbers_count++;
613 } else {
614 e.numbers_count--;
615 right = TOMOYO_NUMBER_UNION;
616 param->data = right_word;
617 if (!tomoyo_parse_number_union(param,
618 numbers_p++))
619 goto out;
620 }
621 }
622store_value:
623 if (!condp) {
624 dprintk(KERN_WARNING "%u: dry_run left=%u right=%u "
625 "match=%u\n", __LINE__, left, right, !is_not);
626 continue;
627 }
628 condp->left = left;
629 condp->right = right;
630 condp->equals = !is_not;
631 dprintk(KERN_WARNING "%u: left=%u right=%u match=%u\n",
632 __LINE__, condp->left, condp->right,
633 condp->equals);
634 condp++;
635 }
636 dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u ac=%u ec=%u\n",
637 __LINE__, e.condc, e.numbers_count, e.names_count, e.argc,
638 e.envc);
639 if (entry) {
640 BUG_ON(e.names_count | e.numbers_count | e.argc | e.envc |
641 e.condc);
642 return tomoyo_commit_condition(entry);
643 }
644 e.size = sizeof(*entry)
645 + e.condc * sizeof(struct tomoyo_condition_element)
646 + e.numbers_count * sizeof(struct tomoyo_number_union)
647 + e.names_count * sizeof(struct tomoyo_name_union)
648 + e.argc * sizeof(struct tomoyo_argv)
649 + e.envc * sizeof(struct tomoyo_envp);
650 entry = kzalloc(e.size, GFP_NOFS);
651 if (!entry)
652 goto out2;
653 *entry = e;
654 e.transit = NULL;
655 condp = (struct tomoyo_condition_element *) (entry + 1);
656 numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
657 names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count);
658 argv = (struct tomoyo_argv *) (names_p + e.names_count);
659 envp = (struct tomoyo_envp *) (argv + e.argc);
660 {
661 bool flag = false;
662 for (pos = start_of_string; pos < end_of_string; pos++) {
663 if (*pos)
664 continue;
665 if (flag) /* Restore " ". */
666 *pos = ' ';
667 else if (*(pos + 1) == '=') /* Restore "!=". */
668 *pos = '!';
669 else /* Restore "=". */
670 *pos = '=';
671 flag = !flag;
672 }
673 }
674 goto rerun;
675out:
676 dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
677 if (entry) {
678 tomoyo_del_condition(&entry->head.list);
679 kfree(entry);
680 }
681out2:
682 tomoyo_put_name(e.transit);
683 return NULL;
684}
685
686/**
687 * tomoyo_get_attributes - Revalidate "struct inode".
688 *
689 * @obj: Pointer to "struct tomoyo_obj_info".
690 *
691 * Returns nothing.
692 */
693void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
694{
695 u8 i;
696 struct dentry *dentry = NULL;
697
698 for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
699 struct inode *inode;
700 switch (i) {
701 case TOMOYO_PATH1:
702 dentry = obj->path1.dentry;
703 if (!dentry)
704 continue;
705 break;
706 case TOMOYO_PATH2:
707 dentry = obj->path2.dentry;
708 if (!dentry)
709 continue;
710 break;
711 default:
712 if (!dentry)
713 continue;
714 dentry = dget_parent(dentry);
715 break;
716 }
717 inode = dentry->d_inode;
718 if (inode) {
719 struct tomoyo_mini_stat *stat = &obj->stat[i];
720 stat->uid = inode->i_uid;
721 stat->gid = inode->i_gid;
722 stat->ino = inode->i_ino;
723 stat->mode = inode->i_mode;
724 stat->dev = inode->i_sb->s_dev;
725 stat->rdev = inode->i_rdev;
726 obj->stat_valid[i] = true;
727 }
728 if (i & 1) /* i == TOMOYO_PATH1_PARENT ||
729 i == TOMOYO_PATH2_PARENT */
730 dput(dentry);
731 }
732}
733
734/**
735 * tomoyo_condition - Check condition part.
736 *
737 * @r: Pointer to "struct tomoyo_request_info".
738 * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
739 *
740 * Returns true on success, false otherwise.
741 *
742 * Caller holds tomoyo_read_lock().
743 */
744bool tomoyo_condition(struct tomoyo_request_info *r,
745 const struct tomoyo_condition *cond)
746{
747 u32 i;
748 unsigned long min_v[2] = { 0, 0 };
749 unsigned long max_v[2] = { 0, 0 };
750 const struct tomoyo_condition_element *condp;
751 const struct tomoyo_number_union *numbers_p;
752 const struct tomoyo_name_union *names_p;
753 const struct tomoyo_argv *argv;
754 const struct tomoyo_envp *envp;
755 struct tomoyo_obj_info *obj;
756 u16 condc;
757 u16 argc;
758 u16 envc;
759 struct linux_binprm *bprm = NULL;
760 if (!cond)
761 return true;
762 condc = cond->condc;
763 argc = cond->argc;
764 envc = cond->envc;
765 obj = r->obj;
766 if (r->ee)
767 bprm = r->ee->bprm;
768 if (!bprm && (argc || envc))
769 return false;
770 condp = (struct tomoyo_condition_element *) (cond + 1);
771 numbers_p = (const struct tomoyo_number_union *) (condp + condc);
772 names_p = (const struct tomoyo_name_union *)
773 (numbers_p + cond->numbers_count);
774 argv = (const struct tomoyo_argv *) (names_p + cond->names_count);
775 envp = (const struct tomoyo_envp *) (argv + argc);
776 for (i = 0; i < condc; i++) {
777 const bool match = condp->equals;
778 const u8 left = condp->left;
779 const u8 right = condp->right;
780 bool is_bitop[2] = { false, false };
781 u8 j;
782 condp++;
783 /* Check argv[] and envp[] later. */
784 if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY)
785 continue;
786 /* Check string expressions. */
787 if (right == TOMOYO_NAME_UNION) {
788 const struct tomoyo_name_union *ptr = names_p++;
789 switch (left) {
790 struct tomoyo_path_info *symlink;
791 struct tomoyo_execve *ee;
792 struct file *file;
793 case TOMOYO_SYMLINK_TARGET:
794 symlink = obj ? obj->symlink_target : NULL;
795 if (!symlink ||
796 !tomoyo_compare_name_union(symlink, ptr)
797 == match)
798 goto out;
799 break;
800 case TOMOYO_EXEC_REALPATH:
801 ee = r->ee;
802 file = ee ? ee->bprm->file : NULL;
803 if (!tomoyo_scan_exec_realpath(file, ptr,
804 match))
805 goto out;
806 break;
807 }
808 continue;
809 }
810 /* Check numeric or bit-op expressions. */
811 for (j = 0; j < 2; j++) {
812 const u8 index = j ? right : left;
813 unsigned long value = 0;
814 switch (index) {
815 case TOMOYO_TASK_UID:
816 value = current_uid();
817 break;
818 case TOMOYO_TASK_EUID:
819 value = current_euid();
820 break;
821 case TOMOYO_TASK_SUID:
822 value = current_suid();
823 break;
824 case TOMOYO_TASK_FSUID:
825 value = current_fsuid();
826 break;
827 case TOMOYO_TASK_GID:
828 value = current_gid();
829 break;
830 case TOMOYO_TASK_EGID:
831 value = current_egid();
832 break;
833 case TOMOYO_TASK_SGID:
834 value = current_sgid();
835 break;
836 case TOMOYO_TASK_FSGID:
837 value = current_fsgid();
838 break;
839 case TOMOYO_TASK_PID:
840 value = tomoyo_sys_getpid();
841 break;
842 case TOMOYO_TASK_PPID:
843 value = tomoyo_sys_getppid();
844 break;
845 case TOMOYO_TYPE_IS_SOCKET:
846 value = S_IFSOCK;
847 break;
848 case TOMOYO_TYPE_IS_SYMLINK:
849 value = S_IFLNK;
850 break;
851 case TOMOYO_TYPE_IS_FILE:
852 value = S_IFREG;
853 break;
854 case TOMOYO_TYPE_IS_BLOCK_DEV:
855 value = S_IFBLK;
856 break;
857 case TOMOYO_TYPE_IS_DIRECTORY:
858 value = S_IFDIR;
859 break;
860 case TOMOYO_TYPE_IS_CHAR_DEV:
861 value = S_IFCHR;
862 break;
863 case TOMOYO_TYPE_IS_FIFO:
864 value = S_IFIFO;
865 break;
866 case TOMOYO_MODE_SETUID:
867 value = S_ISUID;
868 break;
869 case TOMOYO_MODE_SETGID:
870 value = S_ISGID;
871 break;
872 case TOMOYO_MODE_STICKY:
873 value = S_ISVTX;
874 break;
875 case TOMOYO_MODE_OWNER_READ:
876 value = S_IRUSR;
877 break;
878 case TOMOYO_MODE_OWNER_WRITE:
879 value = S_IWUSR;
880 break;
881 case TOMOYO_MODE_OWNER_EXECUTE:
882 value = S_IXUSR;
883 break;
884 case TOMOYO_MODE_GROUP_READ:
885 value = S_IRGRP;
886 break;
887 case TOMOYO_MODE_GROUP_WRITE:
888 value = S_IWGRP;
889 break;
890 case TOMOYO_MODE_GROUP_EXECUTE:
891 value = S_IXGRP;
892 break;
893 case TOMOYO_MODE_OTHERS_READ:
894 value = S_IROTH;
895 break;
896 case TOMOYO_MODE_OTHERS_WRITE:
897 value = S_IWOTH;
898 break;
899 case TOMOYO_MODE_OTHERS_EXECUTE:
900 value = S_IXOTH;
901 break;
902 case TOMOYO_EXEC_ARGC:
903 if (!bprm)
904 goto out;
905 value = bprm->argc;
906 break;
907 case TOMOYO_EXEC_ENVC:
908 if (!bprm)
909 goto out;
910 value = bprm->envc;
911 break;
912 case TOMOYO_NUMBER_UNION:
913 /* Fetch values later. */
914 break;
915 default:
916 if (!obj)
917 goto out;
918 if (!obj->validate_done) {
919 tomoyo_get_attributes(obj);
920 obj->validate_done = true;
921 }
922 {
923 u8 stat_index;
924 struct tomoyo_mini_stat *stat;
925 switch (index) {
926 case TOMOYO_PATH1_UID:
927 case TOMOYO_PATH1_GID:
928 case TOMOYO_PATH1_INO:
929 case TOMOYO_PATH1_MAJOR:
930 case TOMOYO_PATH1_MINOR:
931 case TOMOYO_PATH1_TYPE:
932 case TOMOYO_PATH1_DEV_MAJOR:
933 case TOMOYO_PATH1_DEV_MINOR:
934 case TOMOYO_PATH1_PERM:
935 stat_index = TOMOYO_PATH1;
936 break;
937 case TOMOYO_PATH2_UID:
938 case TOMOYO_PATH2_GID:
939 case TOMOYO_PATH2_INO:
940 case TOMOYO_PATH2_MAJOR:
941 case TOMOYO_PATH2_MINOR:
942 case TOMOYO_PATH2_TYPE:
943 case TOMOYO_PATH2_DEV_MAJOR:
944 case TOMOYO_PATH2_DEV_MINOR:
945 case TOMOYO_PATH2_PERM:
946 stat_index = TOMOYO_PATH2;
947 break;
948 case TOMOYO_PATH1_PARENT_UID:
949 case TOMOYO_PATH1_PARENT_GID:
950 case TOMOYO_PATH1_PARENT_INO:
951 case TOMOYO_PATH1_PARENT_PERM:
952 stat_index =
953 TOMOYO_PATH1_PARENT;
954 break;
955 case TOMOYO_PATH2_PARENT_UID:
956 case TOMOYO_PATH2_PARENT_GID:
957 case TOMOYO_PATH2_PARENT_INO:
958 case TOMOYO_PATH2_PARENT_PERM:
959 stat_index =
960 TOMOYO_PATH2_PARENT;
961 break;
962 default:
963 goto out;
964 }
965 if (!obj->stat_valid[stat_index])
966 goto out;
967 stat = &obj->stat[stat_index];
968 switch (index) {
969 case TOMOYO_PATH1_UID:
970 case TOMOYO_PATH2_UID:
971 case TOMOYO_PATH1_PARENT_UID:
972 case TOMOYO_PATH2_PARENT_UID:
973 value = stat->uid;
974 break;
975 case TOMOYO_PATH1_GID:
976 case TOMOYO_PATH2_GID:
977 case TOMOYO_PATH1_PARENT_GID:
978 case TOMOYO_PATH2_PARENT_GID:
979 value = stat->gid;
980 break;
981 case TOMOYO_PATH1_INO:
982 case TOMOYO_PATH2_INO:
983 case TOMOYO_PATH1_PARENT_INO:
984 case TOMOYO_PATH2_PARENT_INO:
985 value = stat->ino;
986 break;
987 case TOMOYO_PATH1_MAJOR:
988 case TOMOYO_PATH2_MAJOR:
989 value = MAJOR(stat->dev);
990 break;
991 case TOMOYO_PATH1_MINOR:
992 case TOMOYO_PATH2_MINOR:
993 value = MINOR(stat->dev);
994 break;
995 case TOMOYO_PATH1_TYPE:
996 case TOMOYO_PATH2_TYPE:
997 value = stat->mode & S_IFMT;
998 break;
999 case TOMOYO_PATH1_DEV_MAJOR:
1000 case TOMOYO_PATH2_DEV_MAJOR:
1001 value = MAJOR(stat->rdev);
1002 break;
1003 case TOMOYO_PATH1_DEV_MINOR:
1004 case TOMOYO_PATH2_DEV_MINOR:
1005 value = MINOR(stat->rdev);
1006 break;
1007 case TOMOYO_PATH1_PERM:
1008 case TOMOYO_PATH2_PERM:
1009 case TOMOYO_PATH1_PARENT_PERM:
1010 case TOMOYO_PATH2_PARENT_PERM:
1011 value = stat->mode & S_IALLUGO;
1012 break;
1013 }
1014 }
1015 break;
1016 }
1017 max_v[j] = value;
1018 min_v[j] = value;
1019 switch (index) {
1020 case TOMOYO_MODE_SETUID:
1021 case TOMOYO_MODE_SETGID:
1022 case TOMOYO_MODE_STICKY:
1023 case TOMOYO_MODE_OWNER_READ:
1024 case TOMOYO_MODE_OWNER_WRITE:
1025 case TOMOYO_MODE_OWNER_EXECUTE:
1026 case TOMOYO_MODE_GROUP_READ:
1027 case TOMOYO_MODE_GROUP_WRITE:
1028 case TOMOYO_MODE_GROUP_EXECUTE:
1029 case TOMOYO_MODE_OTHERS_READ:
1030 case TOMOYO_MODE_OTHERS_WRITE:
1031 case TOMOYO_MODE_OTHERS_EXECUTE:
1032 is_bitop[j] = true;
1033 }
1034 }
1035 if (left == TOMOYO_NUMBER_UNION) {
1036 /* Fetch values now. */
1037 const struct tomoyo_number_union *ptr = numbers_p++;
1038 min_v[0] = ptr->values[0];
1039 max_v[0] = ptr->values[1];
1040 }
1041 if (right == TOMOYO_NUMBER_UNION) {
1042 /* Fetch values now. */
1043 const struct tomoyo_number_union *ptr = numbers_p++;
1044 if (ptr->group) {
1045 if (tomoyo_number_matches_group(min_v[0],
1046 max_v[0],
1047 ptr->group)
1048 == match)
1049 continue;
1050 } else {
1051 if ((min_v[0] <= ptr->values[1] &&
1052 max_v[0] >= ptr->values[0]) == match)
1053 continue;
1054 }
1055 goto out;
1056 }
1057 /*
1058 * Bit operation is valid only when counterpart value
1059 * represents permission.
1060 */
1061 if (is_bitop[0] && is_bitop[1]) {
1062 goto out;
1063 } else if (is_bitop[0]) {
1064 switch (right) {
1065 case TOMOYO_PATH1_PERM:
1066 case TOMOYO_PATH1_PARENT_PERM:
1067 case TOMOYO_PATH2_PERM:
1068 case TOMOYO_PATH2_PARENT_PERM:
1069 if (!(max_v[0] & max_v[1]) == !match)
1070 continue;
1071 }
1072 goto out;
1073 } else if (is_bitop[1]) {
1074 switch (left) {
1075 case TOMOYO_PATH1_PERM:
1076 case TOMOYO_PATH1_PARENT_PERM:
1077 case TOMOYO_PATH2_PERM:
1078 case TOMOYO_PATH2_PARENT_PERM:
1079 if (!(max_v[0] & max_v[1]) == !match)
1080 continue;
1081 }
1082 goto out;
1083 }
1084 /* Normal value range comparison. */
1085 if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
1086 continue;
1087out:
1088 return false;
1089 }
1090 /* Check argv[] and envp[] now. */
1091 if (r->ee && (argc || envc))
1092 return tomoyo_scan_bprm(r->ee, argc, argv, envc, envp);
1093 return true;
1094}