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Commit | Line | Data |
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9590837b KT |
1 | /* |
2 | * security/tomoyo/common.c | |
3 | * | |
4 | * Common functions for TOMOYO. | |
5 | * | |
c3ef1500 | 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
9590837b KT |
7 | */ |
8 | ||
9 | #include <linux/uaccess.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
9590837b KT |
11 | #include <linux/security.h> |
12 | #include <linux/hardirq.h> | |
9590837b | 13 | #include "common.h" |
9590837b | 14 | |
9590837b KT |
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 | ||
c3fa109a TH |
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 | */ | |
9590837b KT |
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 | ||
c3fa109a TH |
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 | */ | |
9590837b KT |
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 | ||
7762fbff TH |
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 | ||
4c3e9e2d TH |
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 | ||
9590837b KT |
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 | ||
9590837b KT |
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 | ||
9590837b KT |
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 | { | |
9590837b KT |
204 | struct tomoyo_profile *ptr = NULL; |
205 | int i; | |
206 | ||
207 | if (profile >= TOMOYO_MAX_PROFILES) | |
208 | return NULL; | |
29282381 TH |
209 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
210 | return NULL; | |
9590837b KT |
211 | ptr = tomoyo_profile_ptr[profile]; |
212 | if (ptr) | |
213 | goto ok; | |
4e5d6f7e | 214 | ptr = kmalloc(sizeof(*ptr), GFP_NOFS); |
cd7bec6a TH |
215 | if (!tomoyo_memory_ok(ptr)) { |
216 | kfree(ptr); | |
181427a7 | 217 | ptr = NULL; |
9590837b | 218 | goto ok; |
cd7bec6a | 219 | } |
9590837b KT |
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: | |
29282381 | 225 | mutex_unlock(&tomoyo_policy_lock); |
9590837b KT |
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")) { | |
bf24fb01 TH |
260 | const struct tomoyo_path_info *old_comment = profile->comment; |
261 | profile->comment = tomoyo_get_name(cp + 1); | |
262 | tomoyo_put_name(old_comment); | |
9590837b KT |
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 | ||
c3fa109a TH |
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 | * | |
9b244373 | 369 | * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager |
c3fa109a TH |
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 | * | |
9b244373 | 379 | * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \ |
c3fa109a TH |
380 | * /sys/kernel/security/tomoyo/manager |
381 | * | |
382 | * and all entries are retrieved by | |
383 | * | |
384 | * # cat /sys/kernel/security/tomoyo/manager | |
385 | */ | |
847b173e | 386 | LIST_HEAD(tomoyo_policy_manager_list); |
9590837b KT |
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. | |
fdb8ebb7 TH |
395 | * |
396 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
397 | */ |
398 | static int tomoyo_update_manager_entry(const char *manager, | |
399 | const bool is_delete) | |
400 | { | |
9590837b | 401 | struct tomoyo_policy_manager_entry *ptr; |
9e4b50e9 | 402 | struct tomoyo_policy_manager_entry e = { }; |
ca0b7df3 | 403 | int error = is_delete ? -ENOENT : -ENOMEM; |
9590837b KT |
404 | |
405 | if (tomoyo_is_domain_def(manager)) { | |
17080008 | 406 | if (!tomoyo_is_correct_domain(manager)) |
9590837b | 407 | return -EINVAL; |
9e4b50e9 | 408 | e.is_domain = true; |
9590837b | 409 | } else { |
17080008 | 410 | if (!tomoyo_is_correct_path(manager, 1, -1, -1)) |
9590837b KT |
411 | return -EINVAL; |
412 | } | |
9e4b50e9 TH |
413 | e.manager = tomoyo_get_name(manager); |
414 | if (!e.manager) | |
9590837b | 415 | return -ENOMEM; |
29282381 TH |
416 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
417 | goto out; | |
fdb8ebb7 | 418 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { |
9e4b50e9 | 419 | if (ptr->manager != e.manager) |
9590837b KT |
420 | continue; |
421 | ptr->is_deleted = is_delete; | |
422 | error = 0; | |
ca0b7df3 | 423 | break; |
9590837b | 424 | } |
9e4b50e9 TH |
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 | } | |
9590837b | 433 | } |
f737d95d | 434 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 435 | out: |
9e4b50e9 | 436 | tomoyo_put_name(e.manager); |
9590837b KT |
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. | |
fdb8ebb7 TH |
446 | * |
447 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
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. | |
fdb8ebb7 TH |
467 | * |
468 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
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; | |
9590837b KT |
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; | |
7d2948b1 TH |
484 | done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); |
485 | if (!done) | |
9590837b | 486 | break; |
9590837b | 487 | } |
9590837b KT |
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. | |
fdb8ebb7 TH |
497 | * |
498 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
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; | |
fdb8ebb7 | 512 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { |
9590837b KT |
513 | if (!ptr->is_deleted && ptr->is_domain |
514 | && !tomoyo_pathcmp(domainname, ptr->manager)) { | |
515 | found = true; | |
516 | break; | |
517 | } | |
518 | } | |
9590837b KT |
519 | if (found) |
520 | return true; | |
521 | exe = tomoyo_get_exe(); | |
522 | if (!exe) | |
523 | return false; | |
fdb8ebb7 | 524 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { |
9590837b KT |
525 | if (!ptr->is_deleted && !ptr->is_domain |
526 | && !strcmp(exe, ptr->manager->name)) { | |
527 | found = true; | |
528 | break; | |
529 | } | |
530 | } | |
9590837b KT |
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 | } | |
8e2d39a1 | 540 | kfree(exe); |
9590837b KT |
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. | |
fdb8ebb7 TH |
551 | * |
552 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
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; | |
9b244373 | 559 | bool global_pid = false; |
9590837b | 560 | |
9b244373 TH |
561 | if (sscanf(data, "pid=%u", &pid) == 1 || |
562 | (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { | |
9590837b | 563 | struct task_struct *p; |
1fcdc7c5 | 564 | rcu_read_lock(); |
9590837b | 565 | read_lock(&tasklist_lock); |
9b244373 TH |
566 | if (global_pid) |
567 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
568 | else | |
569 | p = find_task_by_vpid(pid); | |
9590837b KT |
570 | if (p) |
571 | domain = tomoyo_real_domain(p); | |
572 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 573 | rcu_read_unlock(); |
9590837b | 574 | } else if (!strncmp(data, "domain=", 7)) { |
fdb8ebb7 | 575 | if (tomoyo_is_domain_def(data + 7)) |
9590837b | 576 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
577 | } else |
578 | return false; | |
579 | head->write_var1 = domain; | |
580 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
581 | if (!head->read_buf) | |
582 | return true; /* Do nothing if open(O_WRONLY). */ | |
583 | head->read_avail = 0; | |
584 | tomoyo_io_printf(head, "# select %s\n", data); | |
585 | head->read_single_domain = true; | |
586 | head->read_eof = !domain; | |
587 | if (domain) { | |
588 | struct tomoyo_domain_info *d; | |
589 | head->read_var1 = NULL; | |
fdb8ebb7 | 590 | list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { |
9590837b KT |
591 | if (d == domain) |
592 | break; | |
593 | head->read_var1 = &d->list; | |
594 | } | |
9590837b KT |
595 | head->read_var2 = NULL; |
596 | head->read_bit = 0; | |
597 | head->read_step = 0; | |
598 | if (domain->is_deleted) | |
599 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
600 | } | |
601 | return true; | |
602 | } | |
603 | ||
ccf135f5 TH |
604 | /** |
605 | * tomoyo_delete_domain - Delete a domain. | |
606 | * | |
607 | * @domainname: The name of domain. | |
608 | * | |
609 | * Returns 0. | |
fdb8ebb7 TH |
610 | * |
611 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
612 | */ |
613 | static int tomoyo_delete_domain(char *domainname) | |
614 | { | |
615 | struct tomoyo_domain_info *domain; | |
616 | struct tomoyo_path_info name; | |
617 | ||
618 | name.name = domainname; | |
619 | tomoyo_fill_path_info(&name); | |
29282381 TH |
620 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
621 | return 0; | |
ccf135f5 | 622 | /* Is there an active domain? */ |
fdb8ebb7 | 623 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
624 | /* Never delete tomoyo_kernel_domain */ |
625 | if (domain == &tomoyo_kernel_domain) | |
626 | continue; | |
627 | if (domain->is_deleted || | |
628 | tomoyo_pathcmp(domain->domainname, &name)) | |
629 | continue; | |
630 | domain->is_deleted = true; | |
631 | break; | |
632 | } | |
f737d95d | 633 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
634 | return 0; |
635 | } | |
636 | ||
17fcfbd9 TH |
637 | /** |
638 | * tomoyo_write_domain_policy2 - Write domain policy. | |
639 | * | |
640 | * @head: Pointer to "struct tomoyo_io_buffer". | |
641 | * | |
642 | * Returns 0 on success, negative value otherwise. | |
643 | * | |
644 | * Caller holds tomoyo_read_lock(). | |
645 | */ | |
646 | static int tomoyo_write_domain_policy2(char *data, | |
647 | struct tomoyo_domain_info *domain, | |
648 | const bool is_delete) | |
649 | { | |
650 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) | |
651 | return tomoyo_write_mount_policy(data, domain, is_delete); | |
652 | return tomoyo_write_file_policy(data, domain, is_delete); | |
653 | } | |
654 | ||
9590837b KT |
655 | /** |
656 | * tomoyo_write_domain_policy - Write domain policy. | |
657 | * | |
658 | * @head: Pointer to "struct tomoyo_io_buffer". | |
659 | * | |
660 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
661 | * |
662 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
663 | */ |
664 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
665 | { | |
666 | char *data = head->write_buf; | |
667 | struct tomoyo_domain_info *domain = head->write_var1; | |
668 | bool is_delete = false; | |
669 | bool is_select = false; | |
9590837b KT |
670 | unsigned int profile; |
671 | ||
672 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
673 | is_delete = true; | |
674 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
675 | is_select = true; | |
9590837b KT |
676 | if (is_select && tomoyo_is_select_one(head, data)) |
677 | return 0; | |
678 | /* Don't allow updating policies by non manager programs. */ | |
679 | if (!tomoyo_is_policy_manager()) | |
680 | return -EPERM; | |
681 | if (tomoyo_is_domain_def(data)) { | |
682 | domain = NULL; | |
683 | if (is_delete) | |
684 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 685 | else if (is_select) |
9590837b | 686 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 687 | else |
9590837b KT |
688 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
689 | head->write_var1 = domain; | |
690 | return 0; | |
691 | } | |
692 | if (!domain) | |
693 | return -EINVAL; | |
694 | ||
695 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
696 | && profile < TOMOYO_MAX_PROFILES) { | |
697 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
698 | domain->profile = (u8) profile; | |
699 | return 0; | |
700 | } | |
701 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 702 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
703 | return 0; |
704 | } | |
9b244373 TH |
705 | if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { |
706 | domain->quota_warned = !is_delete; | |
707 | return 0; | |
708 | } | |
709 | if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { | |
710 | domain->transition_failed = !is_delete; | |
711 | return 0; | |
712 | } | |
17fcfbd9 | 713 | return tomoyo_write_domain_policy2(data, domain, is_delete); |
9590837b KT |
714 | } |
715 | ||
716 | /** | |
7ef61233 | 717 | * tomoyo_print_path_acl - Print a single path ACL entry. |
9590837b KT |
718 | * |
719 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 720 | * @ptr: Pointer to "struct tomoyo_path_acl". |
9590837b KT |
721 | * |
722 | * Returns true on success, false otherwise. | |
723 | */ | |
7ef61233 TH |
724 | static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, |
725 | struct tomoyo_path_acl *ptr) | |
9590837b KT |
726 | { |
727 | int pos; | |
728 | u8 bit; | |
a1f9bb6a | 729 | const u16 perm = ptr->perm; |
9590837b | 730 | |
7ef61233 | 731 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { |
9590837b KT |
732 | if (!(perm & (1 << bit))) |
733 | continue; | |
734 | /* Print "read/write" instead of "read" and "write". */ | |
7ef61233 TH |
735 | if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) |
736 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9590837b | 737 | continue; |
9590837b | 738 | pos = head->read_avail; |
7762fbff TH |
739 | if (!tomoyo_io_printf(head, "allow_%s ", |
740 | tomoyo_path2keyword(bit)) || | |
741 | !tomoyo_print_name_union(head, &ptr->name) || | |
742 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
743 | goto out; |
744 | } | |
745 | head->read_bit = 0; | |
746 | return true; | |
747 | out: | |
748 | head->read_bit = bit; | |
749 | head->read_avail = pos; | |
750 | return false; | |
751 | } | |
752 | ||
753 | /** | |
7ef61233 | 754 | * tomoyo_print_path2_acl - Print a double path ACL entry. |
9590837b KT |
755 | * |
756 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 757 | * @ptr: Pointer to "struct tomoyo_path2_acl". |
9590837b KT |
758 | * |
759 | * Returns true on success, false otherwise. | |
760 | */ | |
7ef61233 TH |
761 | static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, |
762 | struct tomoyo_path2_acl *ptr) | |
9590837b KT |
763 | { |
764 | int pos; | |
9590837b KT |
765 | const u8 perm = ptr->perm; |
766 | u8 bit; | |
767 | ||
7ef61233 | 768 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { |
9590837b KT |
769 | if (!(perm & (1 << bit))) |
770 | continue; | |
9590837b | 771 | pos = head->read_avail; |
7762fbff TH |
772 | if (!tomoyo_io_printf(head, "allow_%s ", |
773 | tomoyo_path22keyword(bit)) || | |
774 | !tomoyo_print_name_union(head, &ptr->name1) || | |
775 | !tomoyo_print_name_union(head, &ptr->name2) || | |
776 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
777 | goto out; |
778 | } | |
779 | head->read_bit = 0; | |
780 | return true; | |
781 | out: | |
782 | head->read_bit = bit; | |
783 | head->read_avail = pos; | |
784 | return false; | |
785 | } | |
786 | ||
a1f9bb6a TH |
787 | /** |
788 | * tomoyo_print_path_number_acl - Print a path_number ACL entry. | |
789 | * | |
790 | * @head: Pointer to "struct tomoyo_io_buffer". | |
791 | * @ptr: Pointer to "struct tomoyo_path_number_acl". | |
792 | * | |
793 | * Returns true on success, false otherwise. | |
794 | */ | |
795 | static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, | |
796 | struct tomoyo_path_number_acl *ptr) | |
797 | { | |
798 | int pos; | |
799 | u8 bit; | |
800 | const u8 perm = ptr->perm; | |
801 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; | |
802 | bit++) { | |
803 | if (!(perm & (1 << bit))) | |
804 | continue; | |
805 | pos = head->read_avail; | |
806 | if (!tomoyo_io_printf(head, "allow_%s", | |
807 | tomoyo_path_number2keyword(bit)) || | |
808 | !tomoyo_print_name_union(head, &ptr->name) || | |
809 | !tomoyo_print_number_union(head, &ptr->number) || | |
810 | !tomoyo_io_printf(head, "\n")) | |
811 | goto out; | |
812 | } | |
813 | head->read_bit = 0; | |
814 | return true; | |
815 | out: | |
816 | head->read_bit = bit; | |
817 | head->read_avail = pos; | |
818 | return false; | |
819 | } | |
820 | ||
821 | /** | |
822 | * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry. | |
823 | * | |
824 | * @head: Pointer to "struct tomoyo_io_buffer". | |
825 | * @ptr: Pointer to "struct tomoyo_path_number3_acl". | |
826 | * | |
827 | * Returns true on success, false otherwise. | |
828 | */ | |
829 | static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head, | |
830 | struct tomoyo_path_number3_acl *ptr) | |
831 | { | |
832 | int pos; | |
833 | u8 bit; | |
834 | const u16 perm = ptr->perm; | |
835 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION; | |
836 | bit++) { | |
837 | if (!(perm & (1 << bit))) | |
838 | continue; | |
839 | pos = head->read_avail; | |
840 | if (!tomoyo_io_printf(head, "allow_%s", | |
841 | tomoyo_path_number32keyword(bit)) || | |
842 | !tomoyo_print_name_union(head, &ptr->name) || | |
843 | !tomoyo_print_number_union(head, &ptr->mode) || | |
844 | !tomoyo_print_number_union(head, &ptr->major) || | |
845 | !tomoyo_print_number_union(head, &ptr->minor) || | |
846 | !tomoyo_io_printf(head, "\n")) | |
847 | goto out; | |
848 | } | |
849 | head->read_bit = 0; | |
850 | return true; | |
851 | out: | |
852 | head->read_bit = bit; | |
853 | head->read_avail = pos; | |
854 | return false; | |
855 | } | |
856 | ||
2106ccd9 TH |
857 | /** |
858 | * tomoyo_print_mount_acl - Print a mount ACL entry. | |
859 | * | |
860 | * @head: Pointer to "struct tomoyo_io_buffer". | |
861 | * @ptr: Pointer to "struct tomoyo_mount_acl". | |
862 | * | |
863 | * Returns true on success, false otherwise. | |
864 | */ | |
865 | static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, | |
866 | struct tomoyo_mount_acl *ptr) | |
867 | { | |
868 | const int pos = head->read_avail; | |
9b244373 TH |
869 | if (ptr->is_deleted) |
870 | return true; | |
2106ccd9 TH |
871 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || |
872 | !tomoyo_print_name_union(head, &ptr->dev_name) || | |
873 | !tomoyo_print_name_union(head, &ptr->dir_name) || | |
874 | !tomoyo_print_name_union(head, &ptr->fs_type) || | |
875 | !tomoyo_print_number_union(head, &ptr->flags) || | |
876 | !tomoyo_io_printf(head, "\n")) { | |
877 | head->read_avail = pos; | |
878 | return false; | |
879 | } | |
880 | return true; | |
881 | } | |
882 | ||
9590837b KT |
883 | /** |
884 | * tomoyo_print_entry - Print an ACL entry. | |
885 | * | |
886 | * @head: Pointer to "struct tomoyo_io_buffer". | |
887 | * @ptr: Pointer to an ACL entry. | |
888 | * | |
889 | * Returns true on success, false otherwise. | |
890 | */ | |
891 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, | |
892 | struct tomoyo_acl_info *ptr) | |
893 | { | |
ea13ddba | 894 | const u8 acl_type = ptr->type; |
9590837b | 895 | |
7ef61233 TH |
896 | if (acl_type == TOMOYO_TYPE_PATH_ACL) { |
897 | struct tomoyo_path_acl *acl | |
898 | = container_of(ptr, struct tomoyo_path_acl, head); | |
899 | return tomoyo_print_path_acl(head, acl); | |
9590837b | 900 | } |
7ef61233 TH |
901 | if (acl_type == TOMOYO_TYPE_PATH2_ACL) { |
902 | struct tomoyo_path2_acl *acl | |
903 | = container_of(ptr, struct tomoyo_path2_acl, head); | |
904 | return tomoyo_print_path2_acl(head, acl); | |
9590837b | 905 | } |
a1f9bb6a TH |
906 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
907 | struct tomoyo_path_number_acl *acl | |
908 | = container_of(ptr, struct tomoyo_path_number_acl, | |
909 | head); | |
910 | return tomoyo_print_path_number_acl(head, acl); | |
911 | } | |
912 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) { | |
913 | struct tomoyo_path_number3_acl *acl | |
914 | = container_of(ptr, struct tomoyo_path_number3_acl, | |
915 | head); | |
916 | return tomoyo_print_path_number3_acl(head, acl); | |
917 | } | |
2106ccd9 TH |
918 | if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { |
919 | struct tomoyo_mount_acl *acl | |
920 | = container_of(ptr, struct tomoyo_mount_acl, head); | |
921 | return tomoyo_print_mount_acl(head, acl); | |
922 | } | |
9590837b KT |
923 | BUG(); /* This must not happen. */ |
924 | return false; | |
925 | } | |
926 | ||
927 | /** | |
928 | * tomoyo_read_domain_policy - Read domain policy. | |
929 | * | |
930 | * @head: Pointer to "struct tomoyo_io_buffer". | |
931 | * | |
932 | * Returns 0. | |
fdb8ebb7 TH |
933 | * |
934 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
935 | */ |
936 | static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) | |
937 | { | |
938 | struct list_head *dpos; | |
939 | struct list_head *apos; | |
940 | bool done = true; | |
941 | ||
942 | if (head->read_eof) | |
943 | return 0; | |
944 | if (head->read_step == 0) | |
945 | head->read_step = 1; | |
9590837b KT |
946 | list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { |
947 | struct tomoyo_domain_info *domain; | |
948 | const char *quota_exceeded = ""; | |
949 | const char *transition_failed = ""; | |
950 | const char *ignore_global_allow_read = ""; | |
951 | domain = list_entry(dpos, struct tomoyo_domain_info, list); | |
952 | if (head->read_step != 1) | |
953 | goto acl_loop; | |
954 | if (domain->is_deleted && !head->read_single_domain) | |
955 | continue; | |
956 | /* Print domainname and flags. */ | |
957 | if (domain->quota_warned) | |
958 | quota_exceeded = "quota_exceeded\n"; | |
ea13ddba | 959 | if (domain->transition_failed) |
9590837b | 960 | transition_failed = "transition_failed\n"; |
ea13ddba | 961 | if (domain->ignore_global_allow_read) |
9590837b KT |
962 | ignore_global_allow_read |
963 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
964 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
965 | "%u\n%s%s%s\n", | |
966 | domain->domainname->name, | |
967 | domain->profile, quota_exceeded, | |
968 | transition_failed, | |
969 | ignore_global_allow_read); | |
970 | if (!done) | |
9590837b | 971 | break; |
9590837b KT |
972 | head->read_step = 2; |
973 | acl_loop: | |
974 | if (head->read_step == 3) | |
975 | goto tail_mark; | |
976 | /* Print ACL entries in the domain. */ | |
9590837b | 977 | list_for_each_cookie(apos, head->read_var2, |
7d2948b1 | 978 | &domain->acl_info_list) { |
9590837b KT |
979 | struct tomoyo_acl_info *ptr |
980 | = list_entry(apos, struct tomoyo_acl_info, | |
7d2948b1 TH |
981 | list); |
982 | done = tomoyo_print_entry(head, ptr); | |
983 | if (!done) | |
9590837b | 984 | break; |
9590837b | 985 | } |
9590837b KT |
986 | if (!done) |
987 | break; | |
988 | head->read_step = 3; | |
989 | tail_mark: | |
7d2948b1 TH |
990 | done = tomoyo_io_printf(head, "\n"); |
991 | if (!done) | |
9590837b | 992 | break; |
9590837b KT |
993 | head->read_step = 1; |
994 | if (head->read_single_domain) | |
995 | break; | |
996 | } | |
9590837b KT |
997 | head->read_eof = done; |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
1003 | * | |
1004 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1005 | * | |
1006 | * Returns 0 on success, -EINVAL otherwise. | |
1007 | * | |
1008 | * This is equivalent to doing | |
1009 | * | |
1010 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
9b244373 | 1011 | * /usr/sbin/tomoyo-loadpolicy -d |
fdb8ebb7 TH |
1012 | * |
1013 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1014 | */ |
1015 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1016 | { | |
1017 | char *data = head->write_buf; | |
1018 | char *cp = strchr(data, ' '); | |
1019 | struct tomoyo_domain_info *domain; | |
1020 | unsigned long profile; | |
1021 | ||
1022 | if (!cp) | |
1023 | return -EINVAL; | |
1024 | *cp = '\0'; | |
9590837b | 1025 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
1026 | if (strict_strtoul(data, 10, &profile)) |
1027 | return -EINVAL; | |
1028 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1029 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1030 | domain->profile = (u8) profile; | |
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | /** | |
1035 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1036 | * | |
1037 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1038 | * | |
1039 | * Returns list of profile number and domainname pairs. | |
1040 | * | |
1041 | * This is equivalent to doing | |
1042 | * | |
1043 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1044 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1045 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1046 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
1047 | * |
1048 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1049 | */ |
1050 | static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) | |
1051 | { | |
1052 | struct list_head *pos; | |
1053 | bool done = true; | |
1054 | ||
1055 | if (head->read_eof) | |
1056 | return 0; | |
9590837b KT |
1057 | list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { |
1058 | struct tomoyo_domain_info *domain; | |
1059 | domain = list_entry(pos, struct tomoyo_domain_info, list); | |
1060 | if (domain->is_deleted) | |
1061 | continue; | |
7d2948b1 TH |
1062 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
1063 | domain->domainname->name); | |
1064 | if (!done) | |
9590837b | 1065 | break; |
9590837b | 1066 | } |
9590837b KT |
1067 | head->read_eof = done; |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | /** | |
1072 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1073 | * | |
1074 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1075 | * | |
1076 | * Returns 0. | |
1077 | */ | |
1078 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1079 | { | |
1080 | unsigned long pid; | |
1081 | /* No error check. */ | |
1082 | strict_strtoul(head->write_buf, 10, &pid); | |
1083 | head->read_step = (int) pid; | |
1084 | head->read_eof = false; | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1090 | * | |
1091 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1092 | * | |
1093 | * Returns the domainname which the specified PID is in on success, | |
1094 | * empty string otherwise. | |
1095 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1096 | * using read()/write() interface rather than sysctl() interface. | |
1097 | */ | |
1098 | static int tomoyo_read_pid(struct tomoyo_io_buffer *head) | |
1099 | { | |
1100 | if (head->read_avail == 0 && !head->read_eof) { | |
1101 | const int pid = head->read_step; | |
1102 | struct task_struct *p; | |
1103 | struct tomoyo_domain_info *domain = NULL; | |
1fcdc7c5 | 1104 | rcu_read_lock(); |
9590837b KT |
1105 | read_lock(&tasklist_lock); |
1106 | p = find_task_by_vpid(pid); | |
1107 | if (p) | |
1108 | domain = tomoyo_real_domain(p); | |
1109 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1110 | rcu_read_unlock(); |
9590837b KT |
1111 | if (domain) |
1112 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1113 | domain->domainname->name); | |
1114 | head->read_eof = true; | |
1115 | } | |
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * tomoyo_write_exception_policy - Write exception policy. | |
1121 | * | |
1122 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1123 | * | |
1124 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1125 | * |
1126 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1127 | */ |
1128 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1129 | { | |
1130 | char *data = head->write_buf; | |
1131 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1132 | ||
1133 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) | |
1134 | return tomoyo_write_domain_keeper_policy(data, false, | |
1135 | is_delete); | |
1136 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) | |
1137 | return tomoyo_write_domain_keeper_policy(data, true, is_delete); | |
1138 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) | |
1139 | return tomoyo_write_domain_initializer_policy(data, false, | |
1140 | is_delete); | |
1141 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) | |
1142 | return tomoyo_write_domain_initializer_policy(data, true, | |
1143 | is_delete); | |
1144 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) | |
1145 | return tomoyo_write_alias_policy(data, is_delete); | |
1146 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) | |
1147 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1148 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1149 | return tomoyo_write_pattern_policy(data, is_delete); | |
1150 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1151 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
7762fbff TH |
1152 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) |
1153 | return tomoyo_write_path_group_policy(data, is_delete); | |
4c3e9e2d TH |
1154 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) |
1155 | return tomoyo_write_number_group_policy(data, is_delete); | |
9590837b KT |
1156 | return -EINVAL; |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * tomoyo_read_exception_policy - Read exception policy. | |
1161 | * | |
1162 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1163 | * | |
1164 | * Returns 0 on success, -EINVAL otherwise. | |
fdb8ebb7 TH |
1165 | * |
1166 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1167 | */ |
1168 | static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) | |
1169 | { | |
1170 | if (!head->read_eof) { | |
1171 | switch (head->read_step) { | |
1172 | case 0: | |
1173 | head->read_var2 = NULL; | |
1174 | head->read_step = 1; | |
1175 | case 1: | |
1176 | if (!tomoyo_read_domain_keeper_policy(head)) | |
1177 | break; | |
1178 | head->read_var2 = NULL; | |
1179 | head->read_step = 2; | |
1180 | case 2: | |
1181 | if (!tomoyo_read_globally_readable_policy(head)) | |
1182 | break; | |
1183 | head->read_var2 = NULL; | |
1184 | head->read_step = 3; | |
1185 | case 3: | |
1186 | head->read_var2 = NULL; | |
1187 | head->read_step = 4; | |
1188 | case 4: | |
1189 | if (!tomoyo_read_domain_initializer_policy(head)) | |
1190 | break; | |
1191 | head->read_var2 = NULL; | |
1192 | head->read_step = 5; | |
1193 | case 5: | |
1194 | if (!tomoyo_read_alias_policy(head)) | |
1195 | break; | |
1196 | head->read_var2 = NULL; | |
1197 | head->read_step = 6; | |
1198 | case 6: | |
1199 | head->read_var2 = NULL; | |
1200 | head->read_step = 7; | |
1201 | case 7: | |
1202 | if (!tomoyo_read_file_pattern(head)) | |
1203 | break; | |
1204 | head->read_var2 = NULL; | |
1205 | head->read_step = 8; | |
1206 | case 8: | |
1207 | if (!tomoyo_read_no_rewrite_policy(head)) | |
1208 | break; | |
1209 | head->read_var2 = NULL; | |
1210 | head->read_step = 9; | |
1211 | case 9: | |
7762fbff TH |
1212 | if (!tomoyo_read_path_group_policy(head)) |
1213 | break; | |
1214 | head->read_var1 = NULL; | |
1215 | head->read_var2 = NULL; | |
1216 | head->read_step = 10; | |
1217 | case 10: | |
4c3e9e2d TH |
1218 | if (!tomoyo_read_number_group_policy(head)) |
1219 | break; | |
1220 | head->read_var1 = NULL; | |
1221 | head->read_var2 = NULL; | |
1222 | head->read_step = 11; | |
1223 | case 11: | |
9590837b KT |
1224 | head->read_eof = true; |
1225 | break; | |
1226 | default: | |
1227 | return -EINVAL; | |
1228 | } | |
1229 | } | |
1230 | return 0; | |
1231 | } | |
1232 | ||
17fcfbd9 TH |
1233 | /** |
1234 | * tomoyo_print_header - Get header line of audit log. | |
1235 | * | |
1236 | * @r: Pointer to "struct tomoyo_request_info". | |
1237 | * | |
1238 | * Returns string representation. | |
1239 | * | |
1240 | * This function uses kmalloc(), so caller must kfree() if this function | |
1241 | * didn't return NULL. | |
1242 | */ | |
1243 | static char *tomoyo_print_header(struct tomoyo_request_info *r) | |
1244 | { | |
1245 | static const char *tomoyo_mode_4[4] = { | |
1246 | "disabled", "learning", "permissive", "enforcing" | |
1247 | }; | |
1248 | struct timeval tv; | |
1249 | const pid_t gpid = task_pid_nr(current); | |
1250 | static const int tomoyo_buffer_len = 4096; | |
1251 | char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); | |
1252 | if (!buffer) | |
1253 | return NULL; | |
1254 | do_gettimeofday(&tv); | |
1255 | snprintf(buffer, tomoyo_buffer_len - 1, | |
1256 | "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" | |
1257 | " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" | |
1258 | " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", | |
1259 | tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, | |
1260 | (pid_t) sys_getpid(), (pid_t) sys_getppid(), | |
1261 | current_uid(), current_gid(), current_euid(), | |
1262 | current_egid(), current_suid(), current_sgid(), | |
1263 | current_fsuid(), current_fsgid()); | |
1264 | return buffer; | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * tomoyo_init_audit_log - Allocate buffer for audit logs. | |
1269 | * | |
1270 | * @len: Required size. | |
1271 | * @r: Pointer to "struct tomoyo_request_info". | |
1272 | * | |
1273 | * Returns pointer to allocated memory. | |
1274 | * | |
1275 | * The @len is updated to add the header lines' size on success. | |
1276 | * | |
1277 | * This function uses kzalloc(), so caller must kfree() if this function | |
1278 | * didn't return NULL. | |
1279 | */ | |
1280 | static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) | |
1281 | { | |
1282 | char *buf = NULL; | |
1283 | const char *header; | |
1284 | const char *domainname; | |
1285 | if (!r->domain) | |
1286 | r->domain = tomoyo_domain(); | |
1287 | domainname = r->domain->domainname->name; | |
1288 | header = tomoyo_print_header(r); | |
1289 | if (!header) | |
1290 | return NULL; | |
1291 | *len += strlen(domainname) + strlen(header) + 10; | |
1292 | buf = kzalloc(*len, GFP_NOFS); | |
1293 | if (buf) | |
1294 | snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); | |
1295 | kfree(header); | |
1296 | return buf; | |
1297 | } | |
1298 | ||
1299 | /* Wait queue for tomoyo_query_list. */ | |
1300 | static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); | |
1301 | ||
1302 | /* Lock for manipulating tomoyo_query_list. */ | |
1303 | static DEFINE_SPINLOCK(tomoyo_query_list_lock); | |
1304 | ||
1305 | /* Structure for query. */ | |
1306 | struct tomoyo_query_entry { | |
1307 | struct list_head list; | |
1308 | char *query; | |
1309 | int query_len; | |
1310 | unsigned int serial; | |
1311 | int timer; | |
1312 | int answer; | |
1313 | }; | |
1314 | ||
1315 | /* The list for "struct tomoyo_query_entry". */ | |
1316 | static LIST_HEAD(tomoyo_query_list); | |
1317 | ||
1318 | /* | |
1319 | * Number of "struct file" referring /sys/kernel/security/tomoyo/query | |
1320 | * interface. | |
1321 | */ | |
1322 | static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); | |
1323 | ||
1324 | /** | |
1325 | * tomoyo_supervisor - Ask for the supervisor's decision. | |
1326 | * | |
1327 | * @r: Pointer to "struct tomoyo_request_info". | |
1328 | * @fmt: The printf()'s format string, followed by parameters. | |
1329 | * | |
1330 | * Returns 0 if the supervisor decided to permit the access request which | |
1331 | * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the | |
1332 | * supervisor decided to retry the access request which violated the policy in | |
1333 | * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. | |
1334 | */ | |
1335 | int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) | |
1336 | { | |
1337 | va_list args; | |
1338 | int error = -EPERM; | |
1339 | int pos; | |
1340 | int len; | |
1341 | static unsigned int tomoyo_serial; | |
1342 | struct tomoyo_query_entry *tomoyo_query_entry = NULL; | |
1343 | bool quota_exceeded = false; | |
1344 | char *header; | |
1345 | switch (r->mode) { | |
1346 | char *buffer; | |
1347 | case TOMOYO_CONFIG_LEARNING: | |
1348 | if (!tomoyo_domain_quota_is_ok(r)) | |
1349 | return 0; | |
1350 | va_start(args, fmt); | |
1351 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; | |
1352 | va_end(args); | |
1353 | buffer = kmalloc(len, GFP_NOFS); | |
1354 | if (!buffer) | |
1355 | return 0; | |
1356 | va_start(args, fmt); | |
1357 | vsnprintf(buffer, len - 1, fmt, args); | |
1358 | va_end(args); | |
1359 | tomoyo_normalize_line(buffer); | |
1360 | tomoyo_write_domain_policy2(buffer, r->domain, false); | |
1361 | kfree(buffer); | |
1362 | /* fall through */ | |
1363 | case TOMOYO_CONFIG_PERMISSIVE: | |
1364 | return 0; | |
1365 | } | |
1366 | if (!r->domain) | |
1367 | r->domain = tomoyo_domain(); | |
1368 | if (!atomic_read(&tomoyo_query_observers)) | |
1369 | return -EPERM; | |
1370 | va_start(args, fmt); | |
1371 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; | |
1372 | va_end(args); | |
1373 | header = tomoyo_init_audit_log(&len, r); | |
1374 | if (!header) | |
1375 | goto out; | |
1376 | tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); | |
1377 | if (!tomoyo_query_entry) | |
1378 | goto out; | |
1379 | tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); | |
1380 | if (!tomoyo_query_entry->query) | |
1381 | goto out; | |
1382 | len = ksize(tomoyo_query_entry->query); | |
1383 | INIT_LIST_HEAD(&tomoyo_query_entry->list); | |
1384 | spin_lock(&tomoyo_query_list_lock); | |
1385 | if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + | |
1386 | sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { | |
1387 | quota_exceeded = true; | |
1388 | } else { | |
1389 | tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); | |
1390 | tomoyo_query_entry->serial = tomoyo_serial++; | |
1391 | } | |
1392 | spin_unlock(&tomoyo_query_list_lock); | |
1393 | if (quota_exceeded) | |
1394 | goto out; | |
1395 | pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", | |
1396 | tomoyo_query_entry->serial, r->retry, header); | |
1397 | kfree(header); | |
1398 | header = NULL; | |
1399 | va_start(args, fmt); | |
1400 | vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); | |
1401 | tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; | |
1402 | va_end(args); | |
1403 | spin_lock(&tomoyo_query_list_lock); | |
1404 | list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); | |
1405 | spin_unlock(&tomoyo_query_list_lock); | |
1406 | /* Give 10 seconds for supervisor's opinion. */ | |
1407 | for (tomoyo_query_entry->timer = 0; | |
1408 | atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; | |
1409 | tomoyo_query_entry->timer++) { | |
1410 | wake_up(&tomoyo_query_wait); | |
1411 | set_current_state(TASK_INTERRUPTIBLE); | |
1412 | schedule_timeout(HZ / 10); | |
1413 | if (tomoyo_query_entry->answer) | |
1414 | break; | |
1415 | } | |
1416 | spin_lock(&tomoyo_query_list_lock); | |
1417 | list_del(&tomoyo_query_entry->list); | |
1418 | tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); | |
1419 | spin_unlock(&tomoyo_query_list_lock); | |
1420 | switch (tomoyo_query_entry->answer) { | |
1421 | case 3: /* Asked to retry by administrator. */ | |
1422 | error = TOMOYO_RETRY_REQUEST; | |
1423 | r->retry++; | |
1424 | break; | |
1425 | case 1: | |
1426 | /* Granted by administrator. */ | |
1427 | error = 0; | |
1428 | break; | |
1429 | case 0: | |
1430 | /* Timed out. */ | |
1431 | break; | |
1432 | default: | |
1433 | /* Rejected by administrator. */ | |
1434 | break; | |
1435 | } | |
1436 | out: | |
1437 | if (tomoyo_query_entry) | |
1438 | kfree(tomoyo_query_entry->query); | |
1439 | kfree(tomoyo_query_entry); | |
1440 | kfree(header); | |
1441 | return error; | |
1442 | } | |
1443 | ||
1444 | /** | |
1445 | * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. | |
1446 | * | |
1447 | * @file: Pointer to "struct file". | |
1448 | * @wait: Pointer to "poll_table". | |
1449 | * | |
1450 | * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. | |
1451 | * | |
1452 | * Waits for access requests which violated policy in enforcing mode. | |
1453 | */ | |
1454 | static int tomoyo_poll_query(struct file *file, poll_table *wait) | |
1455 | { | |
1456 | struct list_head *tmp; | |
1457 | bool found = false; | |
1458 | u8 i; | |
1459 | for (i = 0; i < 2; i++) { | |
1460 | spin_lock(&tomoyo_query_list_lock); | |
1461 | list_for_each(tmp, &tomoyo_query_list) { | |
1462 | struct tomoyo_query_entry *ptr | |
1463 | = list_entry(tmp, struct tomoyo_query_entry, | |
1464 | list); | |
1465 | if (ptr->answer) | |
1466 | continue; | |
1467 | found = true; | |
1468 | break; | |
1469 | } | |
1470 | spin_unlock(&tomoyo_query_list_lock); | |
1471 | if (found) | |
1472 | return POLLIN | POLLRDNORM; | |
1473 | if (i) | |
1474 | break; | |
1475 | poll_wait(file, &tomoyo_query_wait, wait); | |
1476 | } | |
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | /** | |
1481 | * tomoyo_read_query - Read access requests which violated policy in enforcing mode. | |
1482 | * | |
1483 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1484 | * | |
1485 | * Returns 0. | |
1486 | */ | |
1487 | static int tomoyo_read_query(struct tomoyo_io_buffer *head) | |
1488 | { | |
1489 | struct list_head *tmp; | |
1490 | int pos = 0; | |
1491 | int len = 0; | |
1492 | char *buf; | |
1493 | if (head->read_avail) | |
1494 | return 0; | |
1495 | if (head->read_buf) { | |
1496 | kfree(head->read_buf); | |
1497 | head->read_buf = NULL; | |
1498 | head->readbuf_size = 0; | |
1499 | } | |
1500 | spin_lock(&tomoyo_query_list_lock); | |
1501 | list_for_each(tmp, &tomoyo_query_list) { | |
1502 | struct tomoyo_query_entry *ptr | |
1503 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1504 | if (ptr->answer) | |
1505 | continue; | |
1506 | if (pos++ != head->read_step) | |
1507 | continue; | |
1508 | len = ptr->query_len; | |
1509 | break; | |
1510 | } | |
1511 | spin_unlock(&tomoyo_query_list_lock); | |
1512 | if (!len) { | |
1513 | head->read_step = 0; | |
1514 | return 0; | |
1515 | } | |
1516 | buf = kzalloc(len, GFP_NOFS); | |
1517 | if (!buf) | |
1518 | return 0; | |
1519 | pos = 0; | |
1520 | spin_lock(&tomoyo_query_list_lock); | |
1521 | list_for_each(tmp, &tomoyo_query_list) { | |
1522 | struct tomoyo_query_entry *ptr | |
1523 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1524 | if (ptr->answer) | |
1525 | continue; | |
1526 | if (pos++ != head->read_step) | |
1527 | continue; | |
1528 | /* | |
1529 | * Some query can be skipped because tomoyo_query_list | |
1530 | * can change, but I don't care. | |
1531 | */ | |
1532 | if (len == ptr->query_len) | |
1533 | memmove(buf, ptr->query, len); | |
1534 | break; | |
1535 | } | |
1536 | spin_unlock(&tomoyo_query_list_lock); | |
1537 | if (buf[0]) { | |
1538 | head->read_avail = len; | |
1539 | head->readbuf_size = head->read_avail; | |
1540 | head->read_buf = buf; | |
1541 | head->read_step++; | |
1542 | } else { | |
1543 | kfree(buf); | |
1544 | } | |
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | /** | |
1549 | * tomoyo_write_answer - Write the supervisor's decision. | |
1550 | * | |
1551 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1552 | * | |
1553 | * Returns 0 on success, -EINVAL otherwise. | |
1554 | */ | |
1555 | static int tomoyo_write_answer(struct tomoyo_io_buffer *head) | |
1556 | { | |
1557 | char *data = head->write_buf; | |
1558 | struct list_head *tmp; | |
1559 | unsigned int serial; | |
1560 | unsigned int answer; | |
1561 | spin_lock(&tomoyo_query_list_lock); | |
1562 | list_for_each(tmp, &tomoyo_query_list) { | |
1563 | struct tomoyo_query_entry *ptr | |
1564 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1565 | ptr->timer = 0; | |
1566 | } | |
1567 | spin_unlock(&tomoyo_query_list_lock); | |
1568 | if (sscanf(data, "A%u=%u", &serial, &answer) != 2) | |
1569 | return -EINVAL; | |
1570 | spin_lock(&tomoyo_query_list_lock); | |
1571 | list_for_each(tmp, &tomoyo_query_list) { | |
1572 | struct tomoyo_query_entry *ptr | |
1573 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1574 | if (ptr->serial != serial) | |
1575 | continue; | |
1576 | if (!ptr->answer) | |
1577 | ptr->answer = answer; | |
1578 | break; | |
1579 | } | |
1580 | spin_unlock(&tomoyo_query_list_lock); | |
1581 | return 0; | |
1582 | } | |
1583 | ||
9590837b KT |
1584 | /** |
1585 | * tomoyo_read_version: Get version. | |
1586 | * | |
1587 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1588 | * | |
1589 | * Returns version information. | |
1590 | */ | |
1591 | static int tomoyo_read_version(struct tomoyo_io_buffer *head) | |
1592 | { | |
1593 | if (!head->read_eof) { | |
39826a1e | 1594 | tomoyo_io_printf(head, "2.2.0"); |
9590837b KT |
1595 | head->read_eof = true; |
1596 | } | |
1597 | return 0; | |
1598 | } | |
1599 | ||
1600 | /** | |
1601 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1602 | * | |
1603 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1604 | * | |
1605 | * Returns the current process's domainname. | |
1606 | */ | |
1607 | static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) | |
1608 | { | |
1609 | if (!head->read_eof) { | |
1610 | /* | |
1611 | * tomoyo_domain()->domainname != NULL | |
1612 | * because every process belongs to a domain and | |
1613 | * the domain's name cannot be NULL. | |
1614 | */ | |
1615 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1616 | head->read_eof = true; | |
1617 | } | |
1618 | return 0; | |
1619 | } | |
1620 | ||
1621 | /** | |
1622 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1623 | * | |
1624 | * @type: Type of interface. | |
1625 | * @file: Pointer to "struct file". | |
1626 | * | |
1627 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1628 | * |
1629 | * Caller acquires tomoyo_read_lock(). | |
9590837b | 1630 | */ |
c3ef1500 | 1631 | int tomoyo_open_control(const u8 type, struct file *file) |
9590837b | 1632 | { |
4e5d6f7e | 1633 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1634 | |
1635 | if (!head) | |
1636 | return -ENOMEM; | |
1637 | mutex_init(&head->io_sem); | |
17fcfbd9 | 1638 | head->type = type; |
9590837b KT |
1639 | switch (type) { |
1640 | case TOMOYO_DOMAINPOLICY: | |
1641 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1642 | head->write = tomoyo_write_domain_policy; | |
1643 | head->read = tomoyo_read_domain_policy; | |
1644 | break; | |
1645 | case TOMOYO_EXCEPTIONPOLICY: | |
1646 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1647 | head->write = tomoyo_write_exception_policy; | |
1648 | head->read = tomoyo_read_exception_policy; | |
1649 | break; | |
1650 | case TOMOYO_SELFDOMAIN: | |
1651 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1652 | head->read = tomoyo_read_self_domain; | |
1653 | break; | |
1654 | case TOMOYO_DOMAIN_STATUS: | |
1655 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1656 | head->write = tomoyo_write_domain_profile; | |
1657 | head->read = tomoyo_read_domain_profile; | |
1658 | break; | |
1659 | case TOMOYO_PROCESS_STATUS: | |
1660 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1661 | head->write = tomoyo_write_pid; | |
1662 | head->read = tomoyo_read_pid; | |
1663 | break; | |
1664 | case TOMOYO_VERSION: | |
1665 | /* /sys/kernel/security/tomoyo/version */ | |
1666 | head->read = tomoyo_read_version; | |
1667 | head->readbuf_size = 128; | |
1668 | break; | |
1669 | case TOMOYO_MEMINFO: | |
1670 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1671 | head->write = tomoyo_write_memory_quota; | |
1672 | head->read = tomoyo_read_memory_counter; | |
1673 | head->readbuf_size = 512; | |
1674 | break; | |
1675 | case TOMOYO_PROFILE: | |
1676 | /* /sys/kernel/security/tomoyo/profile */ | |
1677 | head->write = tomoyo_write_profile; | |
1678 | head->read = tomoyo_read_profile; | |
1679 | break; | |
17fcfbd9 TH |
1680 | case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
1681 | head->poll = tomoyo_poll_query; | |
1682 | head->write = tomoyo_write_answer; | |
1683 | head->read = tomoyo_read_query; | |
1684 | break; | |
9590837b KT |
1685 | case TOMOYO_MANAGER: |
1686 | /* /sys/kernel/security/tomoyo/manager */ | |
1687 | head->write = tomoyo_write_manager_policy; | |
1688 | head->read = tomoyo_read_manager_policy; | |
1689 | break; | |
1690 | } | |
1691 | if (!(file->f_mode & FMODE_READ)) { | |
1692 | /* | |
1693 | * No need to allocate read_buf since it is not opened | |
1694 | * for reading. | |
1695 | */ | |
1696 | head->read = NULL; | |
17fcfbd9 TH |
1697 | head->poll = NULL; |
1698 | } else if (!head->poll) { | |
1699 | /* Don't allocate read_buf for poll() access. */ | |
9590837b KT |
1700 | if (!head->readbuf_size) |
1701 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 1702 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 1703 | if (!head->read_buf) { |
8e2d39a1 | 1704 | kfree(head); |
9590837b KT |
1705 | return -ENOMEM; |
1706 | } | |
1707 | } | |
1708 | if (!(file->f_mode & FMODE_WRITE)) { | |
1709 | /* | |
1710 | * No need to allocate write_buf since it is not opened | |
1711 | * for writing. | |
1712 | */ | |
1713 | head->write = NULL; | |
1714 | } else if (head->write) { | |
1715 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 1716 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 1717 | if (!head->write_buf) { |
8e2d39a1 TH |
1718 | kfree(head->read_buf); |
1719 | kfree(head); | |
9590837b KT |
1720 | return -ENOMEM; |
1721 | } | |
1722 | } | |
17fcfbd9 TH |
1723 | if (type != TOMOYO_QUERY) |
1724 | head->reader_idx = tomoyo_read_lock(); | |
9590837b KT |
1725 | file->private_data = head; |
1726 | /* | |
1727 | * Call the handler now if the file is | |
1728 | * /sys/kernel/security/tomoyo/self_domain | |
1729 | * so that the user can use | |
1730 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1731 | * to know the current process's domainname. | |
1732 | */ | |
1733 | if (type == TOMOYO_SELFDOMAIN) | |
1734 | tomoyo_read_control(file, NULL, 0); | |
17fcfbd9 TH |
1735 | /* |
1736 | * If the file is /sys/kernel/security/tomoyo/query , increment the | |
1737 | * observer counter. | |
1738 | * The obserber counter is used by tomoyo_supervisor() to see if | |
1739 | * there is some process monitoring /sys/kernel/security/tomoyo/query. | |
1740 | */ | |
1741 | else if (type == TOMOYO_QUERY) | |
1742 | atomic_inc(&tomoyo_query_observers); | |
9590837b KT |
1743 | return 0; |
1744 | } | |
1745 | ||
17fcfbd9 TH |
1746 | /** |
1747 | * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. | |
1748 | * | |
1749 | * @file: Pointer to "struct file". | |
1750 | * @wait: Pointer to "poll_table". | |
1751 | * | |
1752 | * Waits for read readiness. | |
1753 | * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . | |
1754 | */ | |
1755 | int tomoyo_poll_control(struct file *file, poll_table *wait) | |
1756 | { | |
1757 | struct tomoyo_io_buffer *head = file->private_data; | |
1758 | if (!head->poll) | |
1759 | return -ENOSYS; | |
1760 | return head->poll(file, wait); | |
1761 | } | |
1762 | ||
9590837b KT |
1763 | /** |
1764 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1765 | * | |
1766 | * @file: Pointer to "struct file". | |
1767 | * @buffer: Poiner to buffer to write to. | |
1768 | * @buffer_len: Size of @buffer. | |
1769 | * | |
1770 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
1771 | * |
1772 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1773 | */ |
c3ef1500 TH |
1774 | int tomoyo_read_control(struct file *file, char __user *buffer, |
1775 | const int buffer_len) | |
9590837b KT |
1776 | { |
1777 | int len = 0; | |
1778 | struct tomoyo_io_buffer *head = file->private_data; | |
1779 | char *cp; | |
1780 | ||
1781 | if (!head->read) | |
1782 | return -ENOSYS; | |
1783 | if (mutex_lock_interruptible(&head->io_sem)) | |
1784 | return -EINTR; | |
1785 | /* Call the policy handler. */ | |
1786 | len = head->read(head); | |
1787 | if (len < 0) | |
1788 | goto out; | |
1789 | /* Write to buffer. */ | |
1790 | len = head->read_avail; | |
1791 | if (len > buffer_len) | |
1792 | len = buffer_len; | |
1793 | if (!len) | |
1794 | goto out; | |
1795 | /* head->read_buf changes by some functions. */ | |
1796 | cp = head->read_buf; | |
1797 | if (copy_to_user(buffer, cp, len)) { | |
1798 | len = -EFAULT; | |
1799 | goto out; | |
1800 | } | |
1801 | head->read_avail -= len; | |
1802 | memmove(cp, cp + len, head->read_avail); | |
1803 | out: | |
1804 | mutex_unlock(&head->io_sem); | |
1805 | return len; | |
1806 | } | |
1807 | ||
1808 | /** | |
1809 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
1810 | * | |
1811 | * @file: Pointer to "struct file". | |
1812 | * @buffer: Pointer to buffer to read from. | |
1813 | * @buffer_len: Size of @buffer. | |
1814 | * | |
1815 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
1816 | * |
1817 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1818 | */ |
c3ef1500 TH |
1819 | int tomoyo_write_control(struct file *file, const char __user *buffer, |
1820 | const int buffer_len) | |
9590837b KT |
1821 | { |
1822 | struct tomoyo_io_buffer *head = file->private_data; | |
1823 | int error = buffer_len; | |
1824 | int avail_len = buffer_len; | |
1825 | char *cp0 = head->write_buf; | |
1826 | ||
1827 | if (!head->write) | |
1828 | return -ENOSYS; | |
1829 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
1830 | return -EFAULT; | |
1831 | /* Don't allow updating policies by non manager programs. */ | |
1832 | if (head->write != tomoyo_write_pid && | |
1833 | head->write != tomoyo_write_domain_policy && | |
1834 | !tomoyo_is_policy_manager()) | |
1835 | return -EPERM; | |
1836 | if (mutex_lock_interruptible(&head->io_sem)) | |
1837 | return -EINTR; | |
1838 | /* Read a line and dispatch it to the policy handler. */ | |
1839 | while (avail_len > 0) { | |
1840 | char c; | |
1841 | if (head->write_avail >= head->writebuf_size - 1) { | |
1842 | error = -ENOMEM; | |
1843 | break; | |
1844 | } else if (get_user(c, buffer)) { | |
1845 | error = -EFAULT; | |
1846 | break; | |
1847 | } | |
1848 | buffer++; | |
1849 | avail_len--; | |
1850 | cp0[head->write_avail++] = c; | |
1851 | if (c != '\n') | |
1852 | continue; | |
1853 | cp0[head->write_avail - 1] = '\0'; | |
1854 | head->write_avail = 0; | |
1855 | tomoyo_normalize_line(cp0); | |
1856 | head->write(head); | |
1857 | } | |
1858 | mutex_unlock(&head->io_sem); | |
1859 | return error; | |
1860 | } | |
1861 | ||
1862 | /** | |
1863 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
1864 | * | |
1865 | * @file: Pointer to "struct file". | |
1866 | * | |
1867 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
1868 | * |
1869 | * Caller looses tomoyo_read_lock(). | |
9590837b | 1870 | */ |
c3ef1500 | 1871 | int tomoyo_close_control(struct file *file) |
9590837b KT |
1872 | { |
1873 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 1874 | const bool is_write = !!head->write_buf; |
9590837b | 1875 | |
17fcfbd9 TH |
1876 | /* |
1877 | * If the file is /sys/kernel/security/tomoyo/query , decrement the | |
1878 | * observer counter. | |
1879 | */ | |
1880 | if (head->type == TOMOYO_QUERY) | |
1881 | atomic_dec(&tomoyo_query_observers); | |
1882 | else | |
1883 | tomoyo_read_unlock(head->reader_idx); | |
9590837b | 1884 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 1885 | kfree(head->read_buf); |
9590837b | 1886 | head->read_buf = NULL; |
8e2d39a1 | 1887 | kfree(head->write_buf); |
9590837b | 1888 | head->write_buf = NULL; |
8e2d39a1 | 1889 | kfree(head); |
9590837b KT |
1890 | head = NULL; |
1891 | file->private_data = NULL; | |
847b173e TH |
1892 | if (is_write) |
1893 | tomoyo_run_gc(); | |
9590837b KT |
1894 | return 0; |
1895 | } | |
1896 | ||
9590837b | 1897 | /** |
c3ef1500 | 1898 | * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
9590837b | 1899 | */ |
c3ef1500 | 1900 | void tomoyo_check_profile(void) |
9590837b | 1901 | { |
c3ef1500 TH |
1902 | struct tomoyo_domain_info *domain; |
1903 | const int idx = tomoyo_read_lock(); | |
1904 | tomoyo_policy_loaded = true; | |
1905 | /* Check all profiles currently assigned to domains are defined. */ | |
1906 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
1907 | const u8 profile = domain->profile; | |
1908 | if (tomoyo_profile_ptr[profile]) | |
1909 | continue; | |
1910 | panic("Profile %u (used by '%s') not defined.\n", | |
1911 | profile, domain->domainname->name); | |
1912 | } | |
1913 | tomoyo_read_unlock(idx); | |
1914 | printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n"); | |
1915 | printk(KERN_INFO "Mandatory Access Control activated.\n"); | |
9590837b | 1916 | } |