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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 | * | |
369 | * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager | |
370 | * (if you want to specify by a program's location) | |
371 | * | |
372 | * and is deleted by | |
373 | * | |
374 | * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
375 | * /sys/kernel/security/tomoyo/manager | |
376 | * | |
377 | * or | |
378 | * | |
379 | * # echo 'delete /usr/lib/ccs/editpolicy' > \ | |
380 | * /sys/kernel/security/tomoyo/manager | |
381 | * | |
382 | * and all entries are retrieved by | |
383 | * | |
384 | * # cat /sys/kernel/security/tomoyo/manager | |
385 | */ | |
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; | |
559 | ||
560 | if (sscanf(data, "pid=%u", &pid) == 1) { | |
561 | struct task_struct *p; | |
1fcdc7c5 | 562 | rcu_read_lock(); |
9590837b KT |
563 | read_lock(&tasklist_lock); |
564 | p = find_task_by_vpid(pid); | |
565 | if (p) | |
566 | domain = tomoyo_real_domain(p); | |
567 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 568 | rcu_read_unlock(); |
9590837b | 569 | } else if (!strncmp(data, "domain=", 7)) { |
fdb8ebb7 | 570 | if (tomoyo_is_domain_def(data + 7)) |
9590837b | 571 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
572 | } else |
573 | return false; | |
574 | head->write_var1 = domain; | |
575 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
576 | if (!head->read_buf) | |
577 | return true; /* Do nothing if open(O_WRONLY). */ | |
578 | head->read_avail = 0; | |
579 | tomoyo_io_printf(head, "# select %s\n", data); | |
580 | head->read_single_domain = true; | |
581 | head->read_eof = !domain; | |
582 | if (domain) { | |
583 | struct tomoyo_domain_info *d; | |
584 | head->read_var1 = NULL; | |
fdb8ebb7 | 585 | list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { |
9590837b KT |
586 | if (d == domain) |
587 | break; | |
588 | head->read_var1 = &d->list; | |
589 | } | |
9590837b KT |
590 | head->read_var2 = NULL; |
591 | head->read_bit = 0; | |
592 | head->read_step = 0; | |
593 | if (domain->is_deleted) | |
594 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
595 | } | |
596 | return true; | |
597 | } | |
598 | ||
ccf135f5 TH |
599 | /** |
600 | * tomoyo_delete_domain - Delete a domain. | |
601 | * | |
602 | * @domainname: The name of domain. | |
603 | * | |
604 | * Returns 0. | |
fdb8ebb7 TH |
605 | * |
606 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
607 | */ |
608 | static int tomoyo_delete_domain(char *domainname) | |
609 | { | |
610 | struct tomoyo_domain_info *domain; | |
611 | struct tomoyo_path_info name; | |
612 | ||
613 | name.name = domainname; | |
614 | tomoyo_fill_path_info(&name); | |
29282381 TH |
615 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
616 | return 0; | |
ccf135f5 | 617 | /* Is there an active domain? */ |
fdb8ebb7 | 618 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
619 | /* Never delete tomoyo_kernel_domain */ |
620 | if (domain == &tomoyo_kernel_domain) | |
621 | continue; | |
622 | if (domain->is_deleted || | |
623 | tomoyo_pathcmp(domain->domainname, &name)) | |
624 | continue; | |
625 | domain->is_deleted = true; | |
626 | break; | |
627 | } | |
f737d95d | 628 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
629 | return 0; |
630 | } | |
631 | ||
17fcfbd9 TH |
632 | /** |
633 | * tomoyo_write_domain_policy2 - Write domain policy. | |
634 | * | |
635 | * @head: Pointer to "struct tomoyo_io_buffer". | |
636 | * | |
637 | * Returns 0 on success, negative value otherwise. | |
638 | * | |
639 | * Caller holds tomoyo_read_lock(). | |
640 | */ | |
641 | static int tomoyo_write_domain_policy2(char *data, | |
642 | struct tomoyo_domain_info *domain, | |
643 | const bool is_delete) | |
644 | { | |
645 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) | |
646 | return tomoyo_write_mount_policy(data, domain, is_delete); | |
647 | return tomoyo_write_file_policy(data, domain, is_delete); | |
648 | } | |
649 | ||
9590837b KT |
650 | /** |
651 | * tomoyo_write_domain_policy - Write domain policy. | |
652 | * | |
653 | * @head: Pointer to "struct tomoyo_io_buffer". | |
654 | * | |
655 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
656 | * |
657 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
658 | */ |
659 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
660 | { | |
661 | char *data = head->write_buf; | |
662 | struct tomoyo_domain_info *domain = head->write_var1; | |
663 | bool is_delete = false; | |
664 | bool is_select = false; | |
9590837b KT |
665 | unsigned int profile; |
666 | ||
667 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
668 | is_delete = true; | |
669 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
670 | is_select = true; | |
9590837b KT |
671 | if (is_select && tomoyo_is_select_one(head, data)) |
672 | return 0; | |
673 | /* Don't allow updating policies by non manager programs. */ | |
674 | if (!tomoyo_is_policy_manager()) | |
675 | return -EPERM; | |
676 | if (tomoyo_is_domain_def(data)) { | |
677 | domain = NULL; | |
678 | if (is_delete) | |
679 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 680 | else if (is_select) |
9590837b | 681 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 682 | else |
9590837b KT |
683 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
684 | head->write_var1 = domain; | |
685 | return 0; | |
686 | } | |
687 | if (!domain) | |
688 | return -EINVAL; | |
689 | ||
690 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
691 | && profile < TOMOYO_MAX_PROFILES) { | |
692 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
693 | domain->profile = (u8) profile; | |
694 | return 0; | |
695 | } | |
696 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 697 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
698 | return 0; |
699 | } | |
17fcfbd9 | 700 | return tomoyo_write_domain_policy2(data, domain, is_delete); |
9590837b KT |
701 | } |
702 | ||
703 | /** | |
7ef61233 | 704 | * tomoyo_print_path_acl - Print a single path ACL entry. |
9590837b KT |
705 | * |
706 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 707 | * @ptr: Pointer to "struct tomoyo_path_acl". |
9590837b KT |
708 | * |
709 | * Returns true on success, false otherwise. | |
710 | */ | |
7ef61233 TH |
711 | static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, |
712 | struct tomoyo_path_acl *ptr) | |
9590837b KT |
713 | { |
714 | int pos; | |
715 | u8 bit; | |
a1f9bb6a | 716 | const u16 perm = ptr->perm; |
9590837b | 717 | |
7ef61233 | 718 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { |
9590837b KT |
719 | if (!(perm & (1 << bit))) |
720 | continue; | |
721 | /* Print "read/write" instead of "read" and "write". */ | |
7ef61233 TH |
722 | if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) |
723 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9590837b | 724 | continue; |
9590837b | 725 | pos = head->read_avail; |
7762fbff TH |
726 | if (!tomoyo_io_printf(head, "allow_%s ", |
727 | tomoyo_path2keyword(bit)) || | |
728 | !tomoyo_print_name_union(head, &ptr->name) || | |
729 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
730 | goto out; |
731 | } | |
732 | head->read_bit = 0; | |
733 | return true; | |
734 | out: | |
735 | head->read_bit = bit; | |
736 | head->read_avail = pos; | |
737 | return false; | |
738 | } | |
739 | ||
740 | /** | |
7ef61233 | 741 | * tomoyo_print_path2_acl - Print a double path ACL entry. |
9590837b KT |
742 | * |
743 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 744 | * @ptr: Pointer to "struct tomoyo_path2_acl". |
9590837b KT |
745 | * |
746 | * Returns true on success, false otherwise. | |
747 | */ | |
7ef61233 TH |
748 | static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, |
749 | struct tomoyo_path2_acl *ptr) | |
9590837b KT |
750 | { |
751 | int pos; | |
9590837b KT |
752 | const u8 perm = ptr->perm; |
753 | u8 bit; | |
754 | ||
7ef61233 | 755 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { |
9590837b KT |
756 | if (!(perm & (1 << bit))) |
757 | continue; | |
9590837b | 758 | pos = head->read_avail; |
7762fbff TH |
759 | if (!tomoyo_io_printf(head, "allow_%s ", |
760 | tomoyo_path22keyword(bit)) || | |
761 | !tomoyo_print_name_union(head, &ptr->name1) || | |
762 | !tomoyo_print_name_union(head, &ptr->name2) || | |
763 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
764 | goto out; |
765 | } | |
766 | head->read_bit = 0; | |
767 | return true; | |
768 | out: | |
769 | head->read_bit = bit; | |
770 | head->read_avail = pos; | |
771 | return false; | |
772 | } | |
773 | ||
a1f9bb6a TH |
774 | /** |
775 | * tomoyo_print_path_number_acl - Print a path_number ACL entry. | |
776 | * | |
777 | * @head: Pointer to "struct tomoyo_io_buffer". | |
778 | * @ptr: Pointer to "struct tomoyo_path_number_acl". | |
779 | * | |
780 | * Returns true on success, false otherwise. | |
781 | */ | |
782 | static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, | |
783 | struct tomoyo_path_number_acl *ptr) | |
784 | { | |
785 | int pos; | |
786 | u8 bit; | |
787 | const u8 perm = ptr->perm; | |
788 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; | |
789 | bit++) { | |
790 | if (!(perm & (1 << bit))) | |
791 | continue; | |
792 | pos = head->read_avail; | |
793 | if (!tomoyo_io_printf(head, "allow_%s", | |
794 | tomoyo_path_number2keyword(bit)) || | |
795 | !tomoyo_print_name_union(head, &ptr->name) || | |
796 | !tomoyo_print_number_union(head, &ptr->number) || | |
797 | !tomoyo_io_printf(head, "\n")) | |
798 | goto out; | |
799 | } | |
800 | head->read_bit = 0; | |
801 | return true; | |
802 | out: | |
803 | head->read_bit = bit; | |
804 | head->read_avail = pos; | |
805 | return false; | |
806 | } | |
807 | ||
808 | /** | |
809 | * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry. | |
810 | * | |
811 | * @head: Pointer to "struct tomoyo_io_buffer". | |
812 | * @ptr: Pointer to "struct tomoyo_path_number3_acl". | |
813 | * | |
814 | * Returns true on success, false otherwise. | |
815 | */ | |
816 | static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head, | |
817 | struct tomoyo_path_number3_acl *ptr) | |
818 | { | |
819 | int pos; | |
820 | u8 bit; | |
821 | const u16 perm = ptr->perm; | |
822 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION; | |
823 | bit++) { | |
824 | if (!(perm & (1 << bit))) | |
825 | continue; | |
826 | pos = head->read_avail; | |
827 | if (!tomoyo_io_printf(head, "allow_%s", | |
828 | tomoyo_path_number32keyword(bit)) || | |
829 | !tomoyo_print_name_union(head, &ptr->name) || | |
830 | !tomoyo_print_number_union(head, &ptr->mode) || | |
831 | !tomoyo_print_number_union(head, &ptr->major) || | |
832 | !tomoyo_print_number_union(head, &ptr->minor) || | |
833 | !tomoyo_io_printf(head, "\n")) | |
834 | goto out; | |
835 | } | |
836 | head->read_bit = 0; | |
837 | return true; | |
838 | out: | |
839 | head->read_bit = bit; | |
840 | head->read_avail = pos; | |
841 | return false; | |
842 | } | |
843 | ||
2106ccd9 TH |
844 | /** |
845 | * tomoyo_print_mount_acl - Print a mount ACL entry. | |
846 | * | |
847 | * @head: Pointer to "struct tomoyo_io_buffer". | |
848 | * @ptr: Pointer to "struct tomoyo_mount_acl". | |
849 | * | |
850 | * Returns true on success, false otherwise. | |
851 | */ | |
852 | static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, | |
853 | struct tomoyo_mount_acl *ptr) | |
854 | { | |
855 | const int pos = head->read_avail; | |
856 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || | |
857 | !tomoyo_print_name_union(head, &ptr->dev_name) || | |
858 | !tomoyo_print_name_union(head, &ptr->dir_name) || | |
859 | !tomoyo_print_name_union(head, &ptr->fs_type) || | |
860 | !tomoyo_print_number_union(head, &ptr->flags) || | |
861 | !tomoyo_io_printf(head, "\n")) { | |
862 | head->read_avail = pos; | |
863 | return false; | |
864 | } | |
865 | return true; | |
866 | } | |
867 | ||
9590837b KT |
868 | /** |
869 | * tomoyo_print_entry - Print an ACL entry. | |
870 | * | |
871 | * @head: Pointer to "struct tomoyo_io_buffer". | |
872 | * @ptr: Pointer to an ACL entry. | |
873 | * | |
874 | * Returns true on success, false otherwise. | |
875 | */ | |
876 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, | |
877 | struct tomoyo_acl_info *ptr) | |
878 | { | |
ea13ddba | 879 | const u8 acl_type = ptr->type; |
9590837b | 880 | |
7ef61233 TH |
881 | if (acl_type == TOMOYO_TYPE_PATH_ACL) { |
882 | struct tomoyo_path_acl *acl | |
883 | = container_of(ptr, struct tomoyo_path_acl, head); | |
884 | return tomoyo_print_path_acl(head, acl); | |
9590837b | 885 | } |
7ef61233 TH |
886 | if (acl_type == TOMOYO_TYPE_PATH2_ACL) { |
887 | struct tomoyo_path2_acl *acl | |
888 | = container_of(ptr, struct tomoyo_path2_acl, head); | |
889 | return tomoyo_print_path2_acl(head, acl); | |
9590837b | 890 | } |
a1f9bb6a TH |
891 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
892 | struct tomoyo_path_number_acl *acl | |
893 | = container_of(ptr, struct tomoyo_path_number_acl, | |
894 | head); | |
895 | return tomoyo_print_path_number_acl(head, acl); | |
896 | } | |
897 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) { | |
898 | struct tomoyo_path_number3_acl *acl | |
899 | = container_of(ptr, struct tomoyo_path_number3_acl, | |
900 | head); | |
901 | return tomoyo_print_path_number3_acl(head, acl); | |
902 | } | |
2106ccd9 TH |
903 | if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { |
904 | struct tomoyo_mount_acl *acl | |
905 | = container_of(ptr, struct tomoyo_mount_acl, head); | |
906 | return tomoyo_print_mount_acl(head, acl); | |
907 | } | |
9590837b KT |
908 | BUG(); /* This must not happen. */ |
909 | return false; | |
910 | } | |
911 | ||
912 | /** | |
913 | * tomoyo_read_domain_policy - Read domain policy. | |
914 | * | |
915 | * @head: Pointer to "struct tomoyo_io_buffer". | |
916 | * | |
917 | * Returns 0. | |
fdb8ebb7 TH |
918 | * |
919 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
920 | */ |
921 | static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) | |
922 | { | |
923 | struct list_head *dpos; | |
924 | struct list_head *apos; | |
925 | bool done = true; | |
926 | ||
927 | if (head->read_eof) | |
928 | return 0; | |
929 | if (head->read_step == 0) | |
930 | head->read_step = 1; | |
9590837b KT |
931 | list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { |
932 | struct tomoyo_domain_info *domain; | |
933 | const char *quota_exceeded = ""; | |
934 | const char *transition_failed = ""; | |
935 | const char *ignore_global_allow_read = ""; | |
936 | domain = list_entry(dpos, struct tomoyo_domain_info, list); | |
937 | if (head->read_step != 1) | |
938 | goto acl_loop; | |
939 | if (domain->is_deleted && !head->read_single_domain) | |
940 | continue; | |
941 | /* Print domainname and flags. */ | |
942 | if (domain->quota_warned) | |
943 | quota_exceeded = "quota_exceeded\n"; | |
ea13ddba | 944 | if (domain->transition_failed) |
9590837b | 945 | transition_failed = "transition_failed\n"; |
ea13ddba | 946 | if (domain->ignore_global_allow_read) |
9590837b KT |
947 | ignore_global_allow_read |
948 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
949 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
950 | "%u\n%s%s%s\n", | |
951 | domain->domainname->name, | |
952 | domain->profile, quota_exceeded, | |
953 | transition_failed, | |
954 | ignore_global_allow_read); | |
955 | if (!done) | |
9590837b | 956 | break; |
9590837b KT |
957 | head->read_step = 2; |
958 | acl_loop: | |
959 | if (head->read_step == 3) | |
960 | goto tail_mark; | |
961 | /* Print ACL entries in the domain. */ | |
9590837b | 962 | list_for_each_cookie(apos, head->read_var2, |
7d2948b1 | 963 | &domain->acl_info_list) { |
9590837b KT |
964 | struct tomoyo_acl_info *ptr |
965 | = list_entry(apos, struct tomoyo_acl_info, | |
7d2948b1 TH |
966 | list); |
967 | done = tomoyo_print_entry(head, ptr); | |
968 | if (!done) | |
9590837b | 969 | break; |
9590837b | 970 | } |
9590837b KT |
971 | if (!done) |
972 | break; | |
973 | head->read_step = 3; | |
974 | tail_mark: | |
7d2948b1 TH |
975 | done = tomoyo_io_printf(head, "\n"); |
976 | if (!done) | |
9590837b | 977 | break; |
9590837b KT |
978 | head->read_step = 1; |
979 | if (head->read_single_domain) | |
980 | break; | |
981 | } | |
9590837b KT |
982 | head->read_eof = done; |
983 | return 0; | |
984 | } | |
985 | ||
986 | /** | |
987 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
988 | * | |
989 | * @head: Pointer to "struct tomoyo_io_buffer". | |
990 | * | |
991 | * Returns 0 on success, -EINVAL otherwise. | |
992 | * | |
993 | * This is equivalent to doing | |
994 | * | |
995 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
996 | * /usr/lib/ccs/loadpolicy -d | |
fdb8ebb7 TH |
997 | * |
998 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
999 | */ |
1000 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1001 | { | |
1002 | char *data = head->write_buf; | |
1003 | char *cp = strchr(data, ' '); | |
1004 | struct tomoyo_domain_info *domain; | |
1005 | unsigned long profile; | |
1006 | ||
1007 | if (!cp) | |
1008 | return -EINVAL; | |
1009 | *cp = '\0'; | |
9590837b | 1010 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
1011 | if (strict_strtoul(data, 10, &profile)) |
1012 | return -EINVAL; | |
1013 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1014 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1015 | domain->profile = (u8) profile; | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | /** | |
1020 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1021 | * | |
1022 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1023 | * | |
1024 | * Returns list of profile number and domainname pairs. | |
1025 | * | |
1026 | * This is equivalent to doing | |
1027 | * | |
1028 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1029 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1030 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1031 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
1032 | * |
1033 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1034 | */ |
1035 | static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) | |
1036 | { | |
1037 | struct list_head *pos; | |
1038 | bool done = true; | |
1039 | ||
1040 | if (head->read_eof) | |
1041 | return 0; | |
9590837b KT |
1042 | list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { |
1043 | struct tomoyo_domain_info *domain; | |
1044 | domain = list_entry(pos, struct tomoyo_domain_info, list); | |
1045 | if (domain->is_deleted) | |
1046 | continue; | |
7d2948b1 TH |
1047 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
1048 | domain->domainname->name); | |
1049 | if (!done) | |
9590837b | 1050 | break; |
9590837b | 1051 | } |
9590837b KT |
1052 | head->read_eof = done; |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | /** | |
1057 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1058 | * | |
1059 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1060 | * | |
1061 | * Returns 0. | |
1062 | */ | |
1063 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1064 | { | |
1065 | unsigned long pid; | |
1066 | /* No error check. */ | |
1067 | strict_strtoul(head->write_buf, 10, &pid); | |
1068 | head->read_step = (int) pid; | |
1069 | head->read_eof = false; | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /** | |
1074 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1075 | * | |
1076 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1077 | * | |
1078 | * Returns the domainname which the specified PID is in on success, | |
1079 | * empty string otherwise. | |
1080 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1081 | * using read()/write() interface rather than sysctl() interface. | |
1082 | */ | |
1083 | static int tomoyo_read_pid(struct tomoyo_io_buffer *head) | |
1084 | { | |
1085 | if (head->read_avail == 0 && !head->read_eof) { | |
1086 | const int pid = head->read_step; | |
1087 | struct task_struct *p; | |
1088 | struct tomoyo_domain_info *domain = NULL; | |
1fcdc7c5 | 1089 | rcu_read_lock(); |
9590837b KT |
1090 | read_lock(&tasklist_lock); |
1091 | p = find_task_by_vpid(pid); | |
1092 | if (p) | |
1093 | domain = tomoyo_real_domain(p); | |
1094 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1095 | rcu_read_unlock(); |
9590837b KT |
1096 | if (domain) |
1097 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1098 | domain->domainname->name); | |
1099 | head->read_eof = true; | |
1100 | } | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | /** | |
1105 | * tomoyo_write_exception_policy - Write exception policy. | |
1106 | * | |
1107 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1108 | * | |
1109 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1110 | * |
1111 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1112 | */ |
1113 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1114 | { | |
1115 | char *data = head->write_buf; | |
1116 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1117 | ||
1118 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) | |
1119 | return tomoyo_write_domain_keeper_policy(data, false, | |
1120 | is_delete); | |
1121 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) | |
1122 | return tomoyo_write_domain_keeper_policy(data, true, is_delete); | |
1123 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) | |
1124 | return tomoyo_write_domain_initializer_policy(data, false, | |
1125 | is_delete); | |
1126 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) | |
1127 | return tomoyo_write_domain_initializer_policy(data, true, | |
1128 | is_delete); | |
1129 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) | |
1130 | return tomoyo_write_alias_policy(data, is_delete); | |
1131 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) | |
1132 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1133 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1134 | return tomoyo_write_pattern_policy(data, is_delete); | |
1135 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1136 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
7762fbff TH |
1137 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) |
1138 | return tomoyo_write_path_group_policy(data, is_delete); | |
4c3e9e2d TH |
1139 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) |
1140 | return tomoyo_write_number_group_policy(data, is_delete); | |
9590837b KT |
1141 | return -EINVAL; |
1142 | } | |
1143 | ||
1144 | /** | |
1145 | * tomoyo_read_exception_policy - Read exception policy. | |
1146 | * | |
1147 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1148 | * | |
1149 | * Returns 0 on success, -EINVAL otherwise. | |
fdb8ebb7 TH |
1150 | * |
1151 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1152 | */ |
1153 | static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) | |
1154 | { | |
1155 | if (!head->read_eof) { | |
1156 | switch (head->read_step) { | |
1157 | case 0: | |
1158 | head->read_var2 = NULL; | |
1159 | head->read_step = 1; | |
1160 | case 1: | |
1161 | if (!tomoyo_read_domain_keeper_policy(head)) | |
1162 | break; | |
1163 | head->read_var2 = NULL; | |
1164 | head->read_step = 2; | |
1165 | case 2: | |
1166 | if (!tomoyo_read_globally_readable_policy(head)) | |
1167 | break; | |
1168 | head->read_var2 = NULL; | |
1169 | head->read_step = 3; | |
1170 | case 3: | |
1171 | head->read_var2 = NULL; | |
1172 | head->read_step = 4; | |
1173 | case 4: | |
1174 | if (!tomoyo_read_domain_initializer_policy(head)) | |
1175 | break; | |
1176 | head->read_var2 = NULL; | |
1177 | head->read_step = 5; | |
1178 | case 5: | |
1179 | if (!tomoyo_read_alias_policy(head)) | |
1180 | break; | |
1181 | head->read_var2 = NULL; | |
1182 | head->read_step = 6; | |
1183 | case 6: | |
1184 | head->read_var2 = NULL; | |
1185 | head->read_step = 7; | |
1186 | case 7: | |
1187 | if (!tomoyo_read_file_pattern(head)) | |
1188 | break; | |
1189 | head->read_var2 = NULL; | |
1190 | head->read_step = 8; | |
1191 | case 8: | |
1192 | if (!tomoyo_read_no_rewrite_policy(head)) | |
1193 | break; | |
1194 | head->read_var2 = NULL; | |
1195 | head->read_step = 9; | |
1196 | case 9: | |
7762fbff TH |
1197 | if (!tomoyo_read_path_group_policy(head)) |
1198 | break; | |
1199 | head->read_var1 = NULL; | |
1200 | head->read_var2 = NULL; | |
1201 | head->read_step = 10; | |
1202 | case 10: | |
4c3e9e2d TH |
1203 | if (!tomoyo_read_number_group_policy(head)) |
1204 | break; | |
1205 | head->read_var1 = NULL; | |
1206 | head->read_var2 = NULL; | |
1207 | head->read_step = 11; | |
1208 | case 11: | |
9590837b KT |
1209 | head->read_eof = true; |
1210 | break; | |
1211 | default: | |
1212 | return -EINVAL; | |
1213 | } | |
1214 | } | |
1215 | return 0; | |
1216 | } | |
1217 | ||
17fcfbd9 TH |
1218 | /** |
1219 | * tomoyo_print_header - Get header line of audit log. | |
1220 | * | |
1221 | * @r: Pointer to "struct tomoyo_request_info". | |
1222 | * | |
1223 | * Returns string representation. | |
1224 | * | |
1225 | * This function uses kmalloc(), so caller must kfree() if this function | |
1226 | * didn't return NULL. | |
1227 | */ | |
1228 | static char *tomoyo_print_header(struct tomoyo_request_info *r) | |
1229 | { | |
1230 | static const char *tomoyo_mode_4[4] = { | |
1231 | "disabled", "learning", "permissive", "enforcing" | |
1232 | }; | |
1233 | struct timeval tv; | |
1234 | const pid_t gpid = task_pid_nr(current); | |
1235 | static const int tomoyo_buffer_len = 4096; | |
1236 | char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); | |
1237 | if (!buffer) | |
1238 | return NULL; | |
1239 | do_gettimeofday(&tv); | |
1240 | snprintf(buffer, tomoyo_buffer_len - 1, | |
1241 | "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" | |
1242 | " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" | |
1243 | " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", | |
1244 | tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, | |
1245 | (pid_t) sys_getpid(), (pid_t) sys_getppid(), | |
1246 | current_uid(), current_gid(), current_euid(), | |
1247 | current_egid(), current_suid(), current_sgid(), | |
1248 | current_fsuid(), current_fsgid()); | |
1249 | return buffer; | |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * tomoyo_init_audit_log - Allocate buffer for audit logs. | |
1254 | * | |
1255 | * @len: Required size. | |
1256 | * @r: Pointer to "struct tomoyo_request_info". | |
1257 | * | |
1258 | * Returns pointer to allocated memory. | |
1259 | * | |
1260 | * The @len is updated to add the header lines' size on success. | |
1261 | * | |
1262 | * This function uses kzalloc(), so caller must kfree() if this function | |
1263 | * didn't return NULL. | |
1264 | */ | |
1265 | static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) | |
1266 | { | |
1267 | char *buf = NULL; | |
1268 | const char *header; | |
1269 | const char *domainname; | |
1270 | if (!r->domain) | |
1271 | r->domain = tomoyo_domain(); | |
1272 | domainname = r->domain->domainname->name; | |
1273 | header = tomoyo_print_header(r); | |
1274 | if (!header) | |
1275 | return NULL; | |
1276 | *len += strlen(domainname) + strlen(header) + 10; | |
1277 | buf = kzalloc(*len, GFP_NOFS); | |
1278 | if (buf) | |
1279 | snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); | |
1280 | kfree(header); | |
1281 | return buf; | |
1282 | } | |
1283 | ||
1284 | /* Wait queue for tomoyo_query_list. */ | |
1285 | static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); | |
1286 | ||
1287 | /* Lock for manipulating tomoyo_query_list. */ | |
1288 | static DEFINE_SPINLOCK(tomoyo_query_list_lock); | |
1289 | ||
1290 | /* Structure for query. */ | |
1291 | struct tomoyo_query_entry { | |
1292 | struct list_head list; | |
1293 | char *query; | |
1294 | int query_len; | |
1295 | unsigned int serial; | |
1296 | int timer; | |
1297 | int answer; | |
1298 | }; | |
1299 | ||
1300 | /* The list for "struct tomoyo_query_entry". */ | |
1301 | static LIST_HEAD(tomoyo_query_list); | |
1302 | ||
1303 | /* | |
1304 | * Number of "struct file" referring /sys/kernel/security/tomoyo/query | |
1305 | * interface. | |
1306 | */ | |
1307 | static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); | |
1308 | ||
1309 | /** | |
1310 | * tomoyo_supervisor - Ask for the supervisor's decision. | |
1311 | * | |
1312 | * @r: Pointer to "struct tomoyo_request_info". | |
1313 | * @fmt: The printf()'s format string, followed by parameters. | |
1314 | * | |
1315 | * Returns 0 if the supervisor decided to permit the access request which | |
1316 | * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the | |
1317 | * supervisor decided to retry the access request which violated the policy in | |
1318 | * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. | |
1319 | */ | |
1320 | int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) | |
1321 | { | |
1322 | va_list args; | |
1323 | int error = -EPERM; | |
1324 | int pos; | |
1325 | int len; | |
1326 | static unsigned int tomoyo_serial; | |
1327 | struct tomoyo_query_entry *tomoyo_query_entry = NULL; | |
1328 | bool quota_exceeded = false; | |
1329 | char *header; | |
1330 | switch (r->mode) { | |
1331 | char *buffer; | |
1332 | case TOMOYO_CONFIG_LEARNING: | |
1333 | if (!tomoyo_domain_quota_is_ok(r)) | |
1334 | return 0; | |
1335 | va_start(args, fmt); | |
1336 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; | |
1337 | va_end(args); | |
1338 | buffer = kmalloc(len, GFP_NOFS); | |
1339 | if (!buffer) | |
1340 | return 0; | |
1341 | va_start(args, fmt); | |
1342 | vsnprintf(buffer, len - 1, fmt, args); | |
1343 | va_end(args); | |
1344 | tomoyo_normalize_line(buffer); | |
1345 | tomoyo_write_domain_policy2(buffer, r->domain, false); | |
1346 | kfree(buffer); | |
1347 | /* fall through */ | |
1348 | case TOMOYO_CONFIG_PERMISSIVE: | |
1349 | return 0; | |
1350 | } | |
1351 | if (!r->domain) | |
1352 | r->domain = tomoyo_domain(); | |
1353 | if (!atomic_read(&tomoyo_query_observers)) | |
1354 | return -EPERM; | |
1355 | va_start(args, fmt); | |
1356 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; | |
1357 | va_end(args); | |
1358 | header = tomoyo_init_audit_log(&len, r); | |
1359 | if (!header) | |
1360 | goto out; | |
1361 | tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); | |
1362 | if (!tomoyo_query_entry) | |
1363 | goto out; | |
1364 | tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); | |
1365 | if (!tomoyo_query_entry->query) | |
1366 | goto out; | |
1367 | len = ksize(tomoyo_query_entry->query); | |
1368 | INIT_LIST_HEAD(&tomoyo_query_entry->list); | |
1369 | spin_lock(&tomoyo_query_list_lock); | |
1370 | if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + | |
1371 | sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { | |
1372 | quota_exceeded = true; | |
1373 | } else { | |
1374 | tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); | |
1375 | tomoyo_query_entry->serial = tomoyo_serial++; | |
1376 | } | |
1377 | spin_unlock(&tomoyo_query_list_lock); | |
1378 | if (quota_exceeded) | |
1379 | goto out; | |
1380 | pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", | |
1381 | tomoyo_query_entry->serial, r->retry, header); | |
1382 | kfree(header); | |
1383 | header = NULL; | |
1384 | va_start(args, fmt); | |
1385 | vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); | |
1386 | tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; | |
1387 | va_end(args); | |
1388 | spin_lock(&tomoyo_query_list_lock); | |
1389 | list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); | |
1390 | spin_unlock(&tomoyo_query_list_lock); | |
1391 | /* Give 10 seconds for supervisor's opinion. */ | |
1392 | for (tomoyo_query_entry->timer = 0; | |
1393 | atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; | |
1394 | tomoyo_query_entry->timer++) { | |
1395 | wake_up(&tomoyo_query_wait); | |
1396 | set_current_state(TASK_INTERRUPTIBLE); | |
1397 | schedule_timeout(HZ / 10); | |
1398 | if (tomoyo_query_entry->answer) | |
1399 | break; | |
1400 | } | |
1401 | spin_lock(&tomoyo_query_list_lock); | |
1402 | list_del(&tomoyo_query_entry->list); | |
1403 | tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); | |
1404 | spin_unlock(&tomoyo_query_list_lock); | |
1405 | switch (tomoyo_query_entry->answer) { | |
1406 | case 3: /* Asked to retry by administrator. */ | |
1407 | error = TOMOYO_RETRY_REQUEST; | |
1408 | r->retry++; | |
1409 | break; | |
1410 | case 1: | |
1411 | /* Granted by administrator. */ | |
1412 | error = 0; | |
1413 | break; | |
1414 | case 0: | |
1415 | /* Timed out. */ | |
1416 | break; | |
1417 | default: | |
1418 | /* Rejected by administrator. */ | |
1419 | break; | |
1420 | } | |
1421 | out: | |
1422 | if (tomoyo_query_entry) | |
1423 | kfree(tomoyo_query_entry->query); | |
1424 | kfree(tomoyo_query_entry); | |
1425 | kfree(header); | |
1426 | return error; | |
1427 | } | |
1428 | ||
1429 | /** | |
1430 | * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. | |
1431 | * | |
1432 | * @file: Pointer to "struct file". | |
1433 | * @wait: Pointer to "poll_table". | |
1434 | * | |
1435 | * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. | |
1436 | * | |
1437 | * Waits for access requests which violated policy in enforcing mode. | |
1438 | */ | |
1439 | static int tomoyo_poll_query(struct file *file, poll_table *wait) | |
1440 | { | |
1441 | struct list_head *tmp; | |
1442 | bool found = false; | |
1443 | u8 i; | |
1444 | for (i = 0; i < 2; i++) { | |
1445 | spin_lock(&tomoyo_query_list_lock); | |
1446 | list_for_each(tmp, &tomoyo_query_list) { | |
1447 | struct tomoyo_query_entry *ptr | |
1448 | = list_entry(tmp, struct tomoyo_query_entry, | |
1449 | list); | |
1450 | if (ptr->answer) | |
1451 | continue; | |
1452 | found = true; | |
1453 | break; | |
1454 | } | |
1455 | spin_unlock(&tomoyo_query_list_lock); | |
1456 | if (found) | |
1457 | return POLLIN | POLLRDNORM; | |
1458 | if (i) | |
1459 | break; | |
1460 | poll_wait(file, &tomoyo_query_wait, wait); | |
1461 | } | |
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | /** | |
1466 | * tomoyo_read_query - Read access requests which violated policy in enforcing mode. | |
1467 | * | |
1468 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1469 | * | |
1470 | * Returns 0. | |
1471 | */ | |
1472 | static int tomoyo_read_query(struct tomoyo_io_buffer *head) | |
1473 | { | |
1474 | struct list_head *tmp; | |
1475 | int pos = 0; | |
1476 | int len = 0; | |
1477 | char *buf; | |
1478 | if (head->read_avail) | |
1479 | return 0; | |
1480 | if (head->read_buf) { | |
1481 | kfree(head->read_buf); | |
1482 | head->read_buf = NULL; | |
1483 | head->readbuf_size = 0; | |
1484 | } | |
1485 | spin_lock(&tomoyo_query_list_lock); | |
1486 | list_for_each(tmp, &tomoyo_query_list) { | |
1487 | struct tomoyo_query_entry *ptr | |
1488 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1489 | if (ptr->answer) | |
1490 | continue; | |
1491 | if (pos++ != head->read_step) | |
1492 | continue; | |
1493 | len = ptr->query_len; | |
1494 | break; | |
1495 | } | |
1496 | spin_unlock(&tomoyo_query_list_lock); | |
1497 | if (!len) { | |
1498 | head->read_step = 0; | |
1499 | return 0; | |
1500 | } | |
1501 | buf = kzalloc(len, GFP_NOFS); | |
1502 | if (!buf) | |
1503 | return 0; | |
1504 | pos = 0; | |
1505 | spin_lock(&tomoyo_query_list_lock); | |
1506 | list_for_each(tmp, &tomoyo_query_list) { | |
1507 | struct tomoyo_query_entry *ptr | |
1508 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1509 | if (ptr->answer) | |
1510 | continue; | |
1511 | if (pos++ != head->read_step) | |
1512 | continue; | |
1513 | /* | |
1514 | * Some query can be skipped because tomoyo_query_list | |
1515 | * can change, but I don't care. | |
1516 | */ | |
1517 | if (len == ptr->query_len) | |
1518 | memmove(buf, ptr->query, len); | |
1519 | break; | |
1520 | } | |
1521 | spin_unlock(&tomoyo_query_list_lock); | |
1522 | if (buf[0]) { | |
1523 | head->read_avail = len; | |
1524 | head->readbuf_size = head->read_avail; | |
1525 | head->read_buf = buf; | |
1526 | head->read_step++; | |
1527 | } else { | |
1528 | kfree(buf); | |
1529 | } | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | /** | |
1534 | * tomoyo_write_answer - Write the supervisor's decision. | |
1535 | * | |
1536 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1537 | * | |
1538 | * Returns 0 on success, -EINVAL otherwise. | |
1539 | */ | |
1540 | static int tomoyo_write_answer(struct tomoyo_io_buffer *head) | |
1541 | { | |
1542 | char *data = head->write_buf; | |
1543 | struct list_head *tmp; | |
1544 | unsigned int serial; | |
1545 | unsigned int answer; | |
1546 | spin_lock(&tomoyo_query_list_lock); | |
1547 | list_for_each(tmp, &tomoyo_query_list) { | |
1548 | struct tomoyo_query_entry *ptr | |
1549 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1550 | ptr->timer = 0; | |
1551 | } | |
1552 | spin_unlock(&tomoyo_query_list_lock); | |
1553 | if (sscanf(data, "A%u=%u", &serial, &answer) != 2) | |
1554 | return -EINVAL; | |
1555 | spin_lock(&tomoyo_query_list_lock); | |
1556 | list_for_each(tmp, &tomoyo_query_list) { | |
1557 | struct tomoyo_query_entry *ptr | |
1558 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1559 | if (ptr->serial != serial) | |
1560 | continue; | |
1561 | if (!ptr->answer) | |
1562 | ptr->answer = answer; | |
1563 | break; | |
1564 | } | |
1565 | spin_unlock(&tomoyo_query_list_lock); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
9590837b KT |
1569 | /** |
1570 | * tomoyo_read_version: Get version. | |
1571 | * | |
1572 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1573 | * | |
1574 | * Returns version information. | |
1575 | */ | |
1576 | static int tomoyo_read_version(struct tomoyo_io_buffer *head) | |
1577 | { | |
1578 | if (!head->read_eof) { | |
39826a1e | 1579 | tomoyo_io_printf(head, "2.2.0"); |
9590837b KT |
1580 | head->read_eof = true; |
1581 | } | |
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | /** | |
1586 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1587 | * | |
1588 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1589 | * | |
1590 | * Returns the current process's domainname. | |
1591 | */ | |
1592 | static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) | |
1593 | { | |
1594 | if (!head->read_eof) { | |
1595 | /* | |
1596 | * tomoyo_domain()->domainname != NULL | |
1597 | * because every process belongs to a domain and | |
1598 | * the domain's name cannot be NULL. | |
1599 | */ | |
1600 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1601 | head->read_eof = true; | |
1602 | } | |
1603 | return 0; | |
1604 | } | |
1605 | ||
1606 | /** | |
1607 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1608 | * | |
1609 | * @type: Type of interface. | |
1610 | * @file: Pointer to "struct file". | |
1611 | * | |
1612 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1613 | * |
1614 | * Caller acquires tomoyo_read_lock(). | |
9590837b | 1615 | */ |
c3ef1500 | 1616 | int tomoyo_open_control(const u8 type, struct file *file) |
9590837b | 1617 | { |
4e5d6f7e | 1618 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1619 | |
1620 | if (!head) | |
1621 | return -ENOMEM; | |
1622 | mutex_init(&head->io_sem); | |
17fcfbd9 | 1623 | head->type = type; |
9590837b KT |
1624 | switch (type) { |
1625 | case TOMOYO_DOMAINPOLICY: | |
1626 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1627 | head->write = tomoyo_write_domain_policy; | |
1628 | head->read = tomoyo_read_domain_policy; | |
1629 | break; | |
1630 | case TOMOYO_EXCEPTIONPOLICY: | |
1631 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1632 | head->write = tomoyo_write_exception_policy; | |
1633 | head->read = tomoyo_read_exception_policy; | |
1634 | break; | |
1635 | case TOMOYO_SELFDOMAIN: | |
1636 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1637 | head->read = tomoyo_read_self_domain; | |
1638 | break; | |
1639 | case TOMOYO_DOMAIN_STATUS: | |
1640 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1641 | head->write = tomoyo_write_domain_profile; | |
1642 | head->read = tomoyo_read_domain_profile; | |
1643 | break; | |
1644 | case TOMOYO_PROCESS_STATUS: | |
1645 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1646 | head->write = tomoyo_write_pid; | |
1647 | head->read = tomoyo_read_pid; | |
1648 | break; | |
1649 | case TOMOYO_VERSION: | |
1650 | /* /sys/kernel/security/tomoyo/version */ | |
1651 | head->read = tomoyo_read_version; | |
1652 | head->readbuf_size = 128; | |
1653 | break; | |
1654 | case TOMOYO_MEMINFO: | |
1655 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1656 | head->write = tomoyo_write_memory_quota; | |
1657 | head->read = tomoyo_read_memory_counter; | |
1658 | head->readbuf_size = 512; | |
1659 | break; | |
1660 | case TOMOYO_PROFILE: | |
1661 | /* /sys/kernel/security/tomoyo/profile */ | |
1662 | head->write = tomoyo_write_profile; | |
1663 | head->read = tomoyo_read_profile; | |
1664 | break; | |
17fcfbd9 TH |
1665 | case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
1666 | head->poll = tomoyo_poll_query; | |
1667 | head->write = tomoyo_write_answer; | |
1668 | head->read = tomoyo_read_query; | |
1669 | break; | |
9590837b KT |
1670 | case TOMOYO_MANAGER: |
1671 | /* /sys/kernel/security/tomoyo/manager */ | |
1672 | head->write = tomoyo_write_manager_policy; | |
1673 | head->read = tomoyo_read_manager_policy; | |
1674 | break; | |
1675 | } | |
1676 | if (!(file->f_mode & FMODE_READ)) { | |
1677 | /* | |
1678 | * No need to allocate read_buf since it is not opened | |
1679 | * for reading. | |
1680 | */ | |
1681 | head->read = NULL; | |
17fcfbd9 TH |
1682 | head->poll = NULL; |
1683 | } else if (!head->poll) { | |
1684 | /* Don't allocate read_buf for poll() access. */ | |
9590837b KT |
1685 | if (!head->readbuf_size) |
1686 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 1687 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 1688 | if (!head->read_buf) { |
8e2d39a1 | 1689 | kfree(head); |
9590837b KT |
1690 | return -ENOMEM; |
1691 | } | |
1692 | } | |
1693 | if (!(file->f_mode & FMODE_WRITE)) { | |
1694 | /* | |
1695 | * No need to allocate write_buf since it is not opened | |
1696 | * for writing. | |
1697 | */ | |
1698 | head->write = NULL; | |
1699 | } else if (head->write) { | |
1700 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 1701 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 1702 | if (!head->write_buf) { |
8e2d39a1 TH |
1703 | kfree(head->read_buf); |
1704 | kfree(head); | |
9590837b KT |
1705 | return -ENOMEM; |
1706 | } | |
1707 | } | |
17fcfbd9 TH |
1708 | if (type != TOMOYO_QUERY) |
1709 | head->reader_idx = tomoyo_read_lock(); | |
9590837b KT |
1710 | file->private_data = head; |
1711 | /* | |
1712 | * Call the handler now if the file is | |
1713 | * /sys/kernel/security/tomoyo/self_domain | |
1714 | * so that the user can use | |
1715 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1716 | * to know the current process's domainname. | |
1717 | */ | |
1718 | if (type == TOMOYO_SELFDOMAIN) | |
1719 | tomoyo_read_control(file, NULL, 0); | |
17fcfbd9 TH |
1720 | /* |
1721 | * If the file is /sys/kernel/security/tomoyo/query , increment the | |
1722 | * observer counter. | |
1723 | * The obserber counter is used by tomoyo_supervisor() to see if | |
1724 | * there is some process monitoring /sys/kernel/security/tomoyo/query. | |
1725 | */ | |
1726 | else if (type == TOMOYO_QUERY) | |
1727 | atomic_inc(&tomoyo_query_observers); | |
9590837b KT |
1728 | return 0; |
1729 | } | |
1730 | ||
17fcfbd9 TH |
1731 | /** |
1732 | * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. | |
1733 | * | |
1734 | * @file: Pointer to "struct file". | |
1735 | * @wait: Pointer to "poll_table". | |
1736 | * | |
1737 | * Waits for read readiness. | |
1738 | * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . | |
1739 | */ | |
1740 | int tomoyo_poll_control(struct file *file, poll_table *wait) | |
1741 | { | |
1742 | struct tomoyo_io_buffer *head = file->private_data; | |
1743 | if (!head->poll) | |
1744 | return -ENOSYS; | |
1745 | return head->poll(file, wait); | |
1746 | } | |
1747 | ||
9590837b KT |
1748 | /** |
1749 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1750 | * | |
1751 | * @file: Pointer to "struct file". | |
1752 | * @buffer: Poiner to buffer to write to. | |
1753 | * @buffer_len: Size of @buffer. | |
1754 | * | |
1755 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
1756 | * |
1757 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1758 | */ |
c3ef1500 TH |
1759 | int tomoyo_read_control(struct file *file, char __user *buffer, |
1760 | const int buffer_len) | |
9590837b KT |
1761 | { |
1762 | int len = 0; | |
1763 | struct tomoyo_io_buffer *head = file->private_data; | |
1764 | char *cp; | |
1765 | ||
1766 | if (!head->read) | |
1767 | return -ENOSYS; | |
1768 | if (mutex_lock_interruptible(&head->io_sem)) | |
1769 | return -EINTR; | |
1770 | /* Call the policy handler. */ | |
1771 | len = head->read(head); | |
1772 | if (len < 0) | |
1773 | goto out; | |
1774 | /* Write to buffer. */ | |
1775 | len = head->read_avail; | |
1776 | if (len > buffer_len) | |
1777 | len = buffer_len; | |
1778 | if (!len) | |
1779 | goto out; | |
1780 | /* head->read_buf changes by some functions. */ | |
1781 | cp = head->read_buf; | |
1782 | if (copy_to_user(buffer, cp, len)) { | |
1783 | len = -EFAULT; | |
1784 | goto out; | |
1785 | } | |
1786 | head->read_avail -= len; | |
1787 | memmove(cp, cp + len, head->read_avail); | |
1788 | out: | |
1789 | mutex_unlock(&head->io_sem); | |
1790 | return len; | |
1791 | } | |
1792 | ||
1793 | /** | |
1794 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
1795 | * | |
1796 | * @file: Pointer to "struct file". | |
1797 | * @buffer: Pointer to buffer to read from. | |
1798 | * @buffer_len: Size of @buffer. | |
1799 | * | |
1800 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
1801 | * |
1802 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1803 | */ |
c3ef1500 TH |
1804 | int tomoyo_write_control(struct file *file, const char __user *buffer, |
1805 | const int buffer_len) | |
9590837b KT |
1806 | { |
1807 | struct tomoyo_io_buffer *head = file->private_data; | |
1808 | int error = buffer_len; | |
1809 | int avail_len = buffer_len; | |
1810 | char *cp0 = head->write_buf; | |
1811 | ||
1812 | if (!head->write) | |
1813 | return -ENOSYS; | |
1814 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
1815 | return -EFAULT; | |
1816 | /* Don't allow updating policies by non manager programs. */ | |
1817 | if (head->write != tomoyo_write_pid && | |
1818 | head->write != tomoyo_write_domain_policy && | |
1819 | !tomoyo_is_policy_manager()) | |
1820 | return -EPERM; | |
1821 | if (mutex_lock_interruptible(&head->io_sem)) | |
1822 | return -EINTR; | |
1823 | /* Read a line and dispatch it to the policy handler. */ | |
1824 | while (avail_len > 0) { | |
1825 | char c; | |
1826 | if (head->write_avail >= head->writebuf_size - 1) { | |
1827 | error = -ENOMEM; | |
1828 | break; | |
1829 | } else if (get_user(c, buffer)) { | |
1830 | error = -EFAULT; | |
1831 | break; | |
1832 | } | |
1833 | buffer++; | |
1834 | avail_len--; | |
1835 | cp0[head->write_avail++] = c; | |
1836 | if (c != '\n') | |
1837 | continue; | |
1838 | cp0[head->write_avail - 1] = '\0'; | |
1839 | head->write_avail = 0; | |
1840 | tomoyo_normalize_line(cp0); | |
1841 | head->write(head); | |
1842 | } | |
1843 | mutex_unlock(&head->io_sem); | |
1844 | return error; | |
1845 | } | |
1846 | ||
1847 | /** | |
1848 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
1849 | * | |
1850 | * @file: Pointer to "struct file". | |
1851 | * | |
1852 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
1853 | * |
1854 | * Caller looses tomoyo_read_lock(). | |
9590837b | 1855 | */ |
c3ef1500 | 1856 | int tomoyo_close_control(struct file *file) |
9590837b KT |
1857 | { |
1858 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 1859 | const bool is_write = !!head->write_buf; |
9590837b | 1860 | |
17fcfbd9 TH |
1861 | /* |
1862 | * If the file is /sys/kernel/security/tomoyo/query , decrement the | |
1863 | * observer counter. | |
1864 | */ | |
1865 | if (head->type == TOMOYO_QUERY) | |
1866 | atomic_dec(&tomoyo_query_observers); | |
1867 | else | |
1868 | tomoyo_read_unlock(head->reader_idx); | |
9590837b | 1869 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 1870 | kfree(head->read_buf); |
9590837b | 1871 | head->read_buf = NULL; |
8e2d39a1 | 1872 | kfree(head->write_buf); |
9590837b | 1873 | head->write_buf = NULL; |
8e2d39a1 | 1874 | kfree(head); |
9590837b KT |
1875 | head = NULL; |
1876 | file->private_data = NULL; | |
847b173e TH |
1877 | if (is_write) |
1878 | tomoyo_run_gc(); | |
9590837b KT |
1879 | return 0; |
1880 | } | |
1881 | ||
9590837b | 1882 | /** |
c3ef1500 | 1883 | * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
9590837b | 1884 | */ |
c3ef1500 | 1885 | void tomoyo_check_profile(void) |
9590837b | 1886 | { |
c3ef1500 TH |
1887 | struct tomoyo_domain_info *domain; |
1888 | const int idx = tomoyo_read_lock(); | |
1889 | tomoyo_policy_loaded = true; | |
1890 | /* Check all profiles currently assigned to domains are defined. */ | |
1891 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
1892 | const u8 profile = domain->profile; | |
1893 | if (tomoyo_profile_ptr[profile]) | |
1894 | continue; | |
1895 | panic("Profile %u (used by '%s') not defined.\n", | |
1896 | profile, domain->domainname->name); | |
1897 | } | |
1898 | tomoyo_read_unlock(idx); | |
1899 | printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n"); | |
1900 | printk(KERN_INFO "Mandatory Access Control activated.\n"); | |
9590837b | 1901 | } |