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 | 11 | #include <linux/security.h> |
9590837b | 12 | #include "common.h" |
9590837b | 13 | |
57c2590f TH |
14 | static struct tomoyo_profile tomoyo_default_profile = { |
15 | .learning = &tomoyo_default_profile.preference, | |
16 | .permissive = &tomoyo_default_profile.preference, | |
17 | .enforcing = &tomoyo_default_profile.preference, | |
18 | .preference.enforcing_verbose = true, | |
19 | .preference.learning_max_entry = 2048, | |
20 | .preference.learning_verbose = false, | |
21 | .preference.permissive_verbose = true | |
22 | }; | |
23 | ||
24 | /* Profile version. Currently only 20090903 is defined. */ | |
25 | static unsigned int tomoyo_profile_version; | |
26 | ||
27 | /* Profile table. Memory is allocated as needed. */ | |
28 | static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES]; | |
29 | ||
9590837b | 30 | /* String table for functionality that takes 4 modes. */ |
f23571e8 | 31 | static const char *tomoyo_mode[4] = { |
9590837b KT |
32 | "disabled", "learning", "permissive", "enforcing" |
33 | }; | |
9590837b | 34 | |
57c2590f TH |
35 | /* String table for /sys/kernel/security/tomoyo/profile */ |
36 | static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX | |
37 | + TOMOYO_MAX_MAC_CATEGORY_INDEX] = { | |
38 | [TOMOYO_MAC_FILE_EXECUTE] = "file::execute", | |
39 | [TOMOYO_MAC_FILE_OPEN] = "file::open", | |
40 | [TOMOYO_MAC_FILE_CREATE] = "file::create", | |
41 | [TOMOYO_MAC_FILE_UNLINK] = "file::unlink", | |
42 | [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir", | |
43 | [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir", | |
44 | [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo", | |
45 | [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock", | |
46 | [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate", | |
47 | [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink", | |
48 | [TOMOYO_MAC_FILE_REWRITE] = "file::rewrite", | |
49 | [TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock", | |
50 | [TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar", | |
51 | [TOMOYO_MAC_FILE_LINK] = "file::link", | |
52 | [TOMOYO_MAC_FILE_RENAME] = "file::rename", | |
53 | [TOMOYO_MAC_FILE_CHMOD] = "file::chmod", | |
54 | [TOMOYO_MAC_FILE_CHOWN] = "file::chown", | |
55 | [TOMOYO_MAC_FILE_CHGRP] = "file::chgrp", | |
56 | [TOMOYO_MAC_FILE_IOCTL] = "file::ioctl", | |
57 | [TOMOYO_MAC_FILE_CHROOT] = "file::chroot", | |
58 | [TOMOYO_MAC_FILE_MOUNT] = "file::mount", | |
59 | [TOMOYO_MAC_FILE_UMOUNT] = "file::umount", | |
60 | [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root", | |
61 | [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file", | |
9590837b KT |
62 | }; |
63 | ||
9590837b KT |
64 | /* Permit policy management by non-root user? */ |
65 | static bool tomoyo_manage_by_non_root; | |
66 | ||
67 | /* Utility functions. */ | |
68 | ||
57c2590f TH |
69 | /** |
70 | * tomoyo_yesno - Return "yes" or "no". | |
71 | * | |
72 | * @value: Bool value. | |
73 | */ | |
74 | static const char *tomoyo_yesno(const unsigned int value) | |
75 | { | |
76 | return value ? "yes" : "no"; | |
77 | } | |
78 | ||
f23571e8 TH |
79 | static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...) |
80 | { | |
81 | va_list args; | |
82 | const int pos = strlen(buffer); | |
83 | va_start(args, fmt); | |
84 | vsnprintf(buffer + pos, len - pos - 1, fmt, args); | |
85 | va_end(args); | |
86 | } | |
87 | ||
7762fbff | 88 | /** |
f23571e8 | 89 | * tomoyo_flush - Flush queued string to userspace's buffer. |
7762fbff | 90 | * |
f23571e8 | 91 | * @head: Pointer to "struct tomoyo_io_buffer". |
7762fbff | 92 | * |
f23571e8 | 93 | * Returns true if all data was flushed, false otherwise. |
7762fbff | 94 | */ |
f23571e8 | 95 | static bool tomoyo_flush(struct tomoyo_io_buffer *head) |
7762fbff | 96 | { |
f23571e8 TH |
97 | while (head->r.w_pos) { |
98 | const char *w = head->r.w[0]; | |
99 | int len = strlen(w); | |
100 | if (len) { | |
101 | if (len > head->read_user_buf_avail) | |
102 | len = head->read_user_buf_avail; | |
103 | if (!len) | |
104 | return false; | |
105 | if (copy_to_user(head->read_user_buf, w, len)) | |
106 | return false; | |
107 | head->read_user_buf_avail -= len; | |
108 | head->read_user_buf += len; | |
109 | w += len; | |
110 | } | |
c0fa797a TH |
111 | head->r.w[0] = w; |
112 | if (*w) | |
f23571e8 | 113 | return false; |
f23571e8 TH |
114 | /* Add '\0' for query. */ |
115 | if (head->poll) { | |
116 | if (!head->read_user_buf_avail || | |
117 | copy_to_user(head->read_user_buf, "", 1)) | |
118 | return false; | |
119 | head->read_user_buf_avail--; | |
120 | head->read_user_buf++; | |
121 | } | |
122 | head->r.w_pos--; | |
123 | for (len = 0; len < head->r.w_pos; len++) | |
124 | head->r.w[len] = head->r.w[len + 1]; | |
125 | } | |
126 | head->r.avail = 0; | |
127 | return true; | |
7762fbff TH |
128 | } |
129 | ||
4c3e9e2d | 130 | /** |
f23571e8 | 131 | * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure. |
4c3e9e2d | 132 | * |
f23571e8 TH |
133 | * @head: Pointer to "struct tomoyo_io_buffer". |
134 | * @string: String to print. | |
4c3e9e2d | 135 | * |
f23571e8 TH |
136 | * Note that @string has to be kept valid until @head is kfree()d. |
137 | * This means that char[] allocated on stack memory cannot be passed to | |
138 | * this function. Use tomoyo_io_printf() for char[] allocated on stack memory. | |
4c3e9e2d | 139 | */ |
f23571e8 | 140 | static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string) |
4c3e9e2d | 141 | { |
f23571e8 TH |
142 | if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) { |
143 | head->r.w[head->r.w_pos++] = string; | |
144 | tomoyo_flush(head); | |
145 | } else | |
146 | WARN_ON(1); | |
4c3e9e2d TH |
147 | } |
148 | ||
9590837b | 149 | /** |
f23571e8 | 150 | * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure. |
9590837b KT |
151 | * |
152 | * @head: Pointer to "struct tomoyo_io_buffer". | |
153 | * @fmt: The printf()'s format string, followed by parameters. | |
9590837b | 154 | */ |
f23571e8 | 155 | void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) |
9590837b KT |
156 | { |
157 | va_list args; | |
158 | int len; | |
f23571e8 | 159 | int pos = head->r.avail; |
9590837b | 160 | int size = head->readbuf_size - pos; |
9590837b | 161 | if (size <= 0) |
f23571e8 | 162 | return; |
9590837b | 163 | va_start(args, fmt); |
f23571e8 | 164 | len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1; |
9590837b | 165 | va_end(args); |
f23571e8 TH |
166 | if (pos + len >= head->readbuf_size) { |
167 | WARN_ON(1); | |
168 | return; | |
169 | } | |
170 | head->r.avail += len; | |
171 | tomoyo_set_string(head, head->read_buf + pos); | |
172 | } | |
173 | ||
174 | static void tomoyo_set_space(struct tomoyo_io_buffer *head) | |
175 | { | |
176 | tomoyo_set_string(head, " "); | |
177 | } | |
178 | ||
179 | static bool tomoyo_set_lf(struct tomoyo_io_buffer *head) | |
180 | { | |
181 | tomoyo_set_string(head, "\n"); | |
182 | return !head->r.w_pos; | |
183 | } | |
184 | ||
185 | /** | |
186 | * tomoyo_print_name_union - Print a tomoyo_name_union. | |
187 | * | |
188 | * @head: Pointer to "struct tomoyo_io_buffer". | |
189 | * @ptr: Pointer to "struct tomoyo_name_union". | |
190 | */ | |
191 | static void tomoyo_print_name_union(struct tomoyo_io_buffer *head, | |
192 | const struct tomoyo_name_union *ptr) | |
193 | { | |
194 | tomoyo_set_space(head); | |
195 | if (ptr->is_group) { | |
196 | tomoyo_set_string(head, "@"); | |
197 | tomoyo_set_string(head, ptr->group->group_name->name); | |
198 | } else { | |
199 | tomoyo_set_string(head, ptr->filename->name); | |
200 | } | |
201 | } | |
202 | ||
203 | /** | |
204 | * tomoyo_print_number_union - Print a tomoyo_number_union. | |
205 | * | |
206 | * @head: Pointer to "struct tomoyo_io_buffer". | |
207 | * @ptr: Pointer to "struct tomoyo_number_union". | |
208 | */ | |
209 | static void tomoyo_print_number_union(struct tomoyo_io_buffer *head, | |
210 | const struct tomoyo_number_union *ptr) | |
211 | { | |
212 | tomoyo_set_space(head); | |
213 | if (ptr->is_group) { | |
214 | tomoyo_set_string(head, "@"); | |
215 | tomoyo_set_string(head, ptr->group->group_name->name); | |
216 | } else { | |
217 | int i; | |
218 | unsigned long min = ptr->values[0]; | |
219 | const unsigned long max = ptr->values[1]; | |
220 | u8 min_type = ptr->min_type; | |
221 | const u8 max_type = ptr->max_type; | |
222 | char buffer[128]; | |
223 | buffer[0] = '\0'; | |
224 | for (i = 0; i < 2; i++) { | |
225 | switch (min_type) { | |
226 | case TOMOYO_VALUE_TYPE_HEXADECIMAL: | |
227 | tomoyo_addprintf(buffer, sizeof(buffer), | |
228 | "0x%lX", min); | |
229 | break; | |
230 | case TOMOYO_VALUE_TYPE_OCTAL: | |
231 | tomoyo_addprintf(buffer, sizeof(buffer), | |
232 | "0%lo", min); | |
233 | break; | |
234 | default: | |
235 | tomoyo_addprintf(buffer, sizeof(buffer), | |
236 | "%lu", min); | |
237 | break; | |
238 | } | |
239 | if (min == max && min_type == max_type) | |
240 | break; | |
241 | tomoyo_addprintf(buffer, sizeof(buffer), "-"); | |
242 | min_type = max_type; | |
243 | min = max; | |
244 | } | |
245 | tomoyo_io_printf(head, "%s", buffer); | |
246 | } | |
9590837b KT |
247 | } |
248 | ||
9590837b | 249 | /** |
e2bf6907 | 250 | * tomoyo_assign_profile - Create a new profile. |
9590837b KT |
251 | * |
252 | * @profile: Profile number to create. | |
253 | * | |
254 | * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. | |
255 | */ | |
e2bf6907 | 256 | static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile) |
9590837b | 257 | { |
57c2590f TH |
258 | struct tomoyo_profile *ptr; |
259 | struct tomoyo_profile *entry; | |
9590837b KT |
260 | if (profile >= TOMOYO_MAX_PROFILES) |
261 | return NULL; | |
9590837b KT |
262 | ptr = tomoyo_profile_ptr[profile]; |
263 | if (ptr) | |
57c2590f TH |
264 | return ptr; |
265 | entry = kzalloc(sizeof(*entry), GFP_NOFS); | |
266 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
267 | goto out; | |
268 | ptr = tomoyo_profile_ptr[profile]; | |
269 | if (!ptr && tomoyo_memory_ok(entry)) { | |
270 | ptr = entry; | |
271 | ptr->learning = &tomoyo_default_profile.preference; | |
272 | ptr->permissive = &tomoyo_default_profile.preference; | |
273 | ptr->enforcing = &tomoyo_default_profile.preference; | |
274 | ptr->default_config = TOMOYO_CONFIG_DISABLED; | |
275 | memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, | |
276 | sizeof(ptr->config)); | |
277 | mb(); /* Avoid out-of-order execution. */ | |
278 | tomoyo_profile_ptr[profile] = ptr; | |
279 | entry = NULL; | |
cd7bec6a | 280 | } |
29282381 | 281 | mutex_unlock(&tomoyo_policy_lock); |
57c2590f TH |
282 | out: |
283 | kfree(entry); | |
9590837b KT |
284 | return ptr; |
285 | } | |
286 | ||
287 | /** | |
57c2590f TH |
288 | * tomoyo_profile - Find a profile. |
289 | * | |
290 | * @profile: Profile number to find. | |
291 | * | |
292 | * Returns pointer to "struct tomoyo_profile". | |
293 | */ | |
294 | struct tomoyo_profile *tomoyo_profile(const u8 profile) | |
295 | { | |
296 | struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile]; | |
297 | if (!tomoyo_policy_loaded) | |
298 | return &tomoyo_default_profile; | |
299 | BUG_ON(!ptr); | |
300 | return ptr; | |
301 | } | |
302 | ||
8e568687 TH |
303 | static s8 tomoyo_find_yesno(const char *string, const char *find) |
304 | { | |
305 | const char *cp = strstr(string, find); | |
306 | if (cp) { | |
307 | cp += strlen(find); | |
308 | if (!strncmp(cp, "=yes", 4)) | |
309 | return 1; | |
310 | else if (!strncmp(cp, "=no", 3)) | |
311 | return 0; | |
312 | } | |
313 | return -1; | |
314 | } | |
315 | ||
316 | static void tomoyo_set_bool(bool *b, const char *string, const char *find) | |
317 | { | |
318 | switch (tomoyo_find_yesno(string, find)) { | |
319 | case 1: | |
320 | *b = true; | |
321 | break; | |
322 | case 0: | |
323 | *b = false; | |
324 | break; | |
325 | } | |
326 | } | |
327 | ||
328 | static void tomoyo_set_uint(unsigned int *i, const char *string, | |
329 | const char *find) | |
330 | { | |
331 | const char *cp = strstr(string, find); | |
332 | if (cp) | |
333 | sscanf(cp + strlen(find), "=%u", i); | |
334 | } | |
335 | ||
336 | static void tomoyo_set_pref(const char *name, const char *value, | |
337 | const bool use_default, | |
338 | struct tomoyo_profile *profile) | |
339 | { | |
340 | struct tomoyo_preference **pref; | |
341 | bool *verbose; | |
342 | if (!strcmp(name, "enforcing")) { | |
343 | if (use_default) { | |
344 | pref = &profile->enforcing; | |
345 | goto set_default; | |
346 | } | |
347 | profile->enforcing = &profile->preference; | |
348 | verbose = &profile->preference.enforcing_verbose; | |
349 | goto set_verbose; | |
350 | } | |
351 | if (!strcmp(name, "permissive")) { | |
352 | if (use_default) { | |
353 | pref = &profile->permissive; | |
354 | goto set_default; | |
355 | } | |
356 | profile->permissive = &profile->preference; | |
357 | verbose = &profile->preference.permissive_verbose; | |
358 | goto set_verbose; | |
359 | } | |
360 | if (!strcmp(name, "learning")) { | |
361 | if (use_default) { | |
362 | pref = &profile->learning; | |
363 | goto set_default; | |
364 | } | |
365 | profile->learning = &profile->preference; | |
366 | tomoyo_set_uint(&profile->preference.learning_max_entry, value, | |
367 | "max_entry"); | |
368 | verbose = &profile->preference.learning_verbose; | |
369 | goto set_verbose; | |
370 | } | |
371 | return; | |
372 | set_default: | |
373 | *pref = &tomoyo_default_profile.preference; | |
374 | return; | |
375 | set_verbose: | |
376 | tomoyo_set_bool(verbose, value, "verbose"); | |
377 | } | |
378 | ||
379 | static int tomoyo_set_mode(char *name, const char *value, | |
380 | const bool use_default, | |
381 | struct tomoyo_profile *profile) | |
382 | { | |
383 | u8 i; | |
384 | u8 config; | |
385 | if (!strcmp(name, "CONFIG")) { | |
386 | i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; | |
387 | config = profile->default_config; | |
388 | } else if (tomoyo_str_starts(&name, "CONFIG::")) { | |
389 | config = 0; | |
390 | for (i = 0; i < TOMOYO_MAX_MAC_INDEX | |
391 | + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { | |
392 | if (strcmp(name, tomoyo_mac_keywords[i])) | |
393 | continue; | |
394 | config = profile->config[i]; | |
395 | break; | |
396 | } | |
397 | if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) | |
398 | return -EINVAL; | |
399 | } else { | |
400 | return -EINVAL; | |
401 | } | |
402 | if (use_default) { | |
403 | config = TOMOYO_CONFIG_USE_DEFAULT; | |
404 | } else { | |
405 | u8 mode; | |
406 | for (mode = 0; mode < 4; mode++) | |
407 | if (strstr(value, tomoyo_mode[mode])) | |
408 | /* | |
409 | * Update lower 3 bits in order to distinguish | |
410 | * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. | |
411 | */ | |
412 | config = (config & ~7) | mode; | |
413 | } | |
414 | if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) | |
415 | profile->config[i] = config; | |
416 | else if (config != TOMOYO_CONFIG_USE_DEFAULT) | |
417 | profile->default_config = config; | |
418 | return 0; | |
419 | } | |
420 | ||
57c2590f TH |
421 | /** |
422 | * tomoyo_write_profile - Write profile table. | |
9590837b KT |
423 | * |
424 | * @head: Pointer to "struct tomoyo_io_buffer". | |
425 | * | |
426 | * Returns 0 on success, negative value otherwise. | |
427 | */ | |
428 | static int tomoyo_write_profile(struct tomoyo_io_buffer *head) | |
429 | { | |
430 | char *data = head->write_buf; | |
431 | unsigned int i; | |
57c2590f | 432 | bool use_default = false; |
9590837b KT |
433 | char *cp; |
434 | struct tomoyo_profile *profile; | |
57c2590f TH |
435 | if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1) |
436 | return 0; | |
437 | i = simple_strtoul(data, &cp, 10); | |
438 | if (data == cp) { | |
439 | profile = &tomoyo_default_profile; | |
440 | } else { | |
441 | if (*cp != '-') | |
442 | return -EINVAL; | |
9590837b | 443 | data = cp + 1; |
e2bf6907 | 444 | profile = tomoyo_assign_profile(i); |
57c2590f TH |
445 | if (!profile) |
446 | return -EINVAL; | |
447 | } | |
9590837b KT |
448 | cp = strchr(data, '='); |
449 | if (!cp) | |
450 | return -EINVAL; | |
57c2590f TH |
451 | *cp++ = '\0'; |
452 | if (profile != &tomoyo_default_profile) | |
453 | use_default = strstr(cp, "use_default") != NULL; | |
8e568687 TH |
454 | if (tomoyo_str_starts(&data, "PREFERENCE::")) { |
455 | tomoyo_set_pref(data, cp, use_default, profile); | |
57c2590f TH |
456 | return 0; |
457 | } | |
458 | if (profile == &tomoyo_default_profile) | |
459 | return -EINVAL; | |
9590837b | 460 | if (!strcmp(data, "COMMENT")) { |
2a086e5d TH |
461 | static DEFINE_SPINLOCK(lock); |
462 | const struct tomoyo_path_info *new_comment | |
463 | = tomoyo_get_name(cp); | |
464 | const struct tomoyo_path_info *old_comment; | |
465 | if (!new_comment) | |
466 | return -ENOMEM; | |
467 | spin_lock(&lock); | |
468 | old_comment = profile->comment; | |
469 | profile->comment = new_comment; | |
470 | spin_unlock(&lock); | |
bf24fb01 | 471 | tomoyo_put_name(old_comment); |
9590837b KT |
472 | return 0; |
473 | } | |
8e568687 | 474 | return tomoyo_set_mode(data, cp, use_default, profile); |
9590837b KT |
475 | } |
476 | ||
f23571e8 TH |
477 | static void tomoyo_print_preference(struct tomoyo_io_buffer *head, |
478 | const int idx) | |
479 | { | |
480 | struct tomoyo_preference *pref = &tomoyo_default_profile.preference; | |
481 | const struct tomoyo_profile *profile = idx >= 0 ? | |
482 | tomoyo_profile_ptr[idx] : NULL; | |
483 | char buffer[16] = ""; | |
484 | if (profile) { | |
485 | buffer[sizeof(buffer) - 1] = '\0'; | |
486 | snprintf(buffer, sizeof(buffer) - 1, "%u-", idx); | |
487 | } | |
488 | if (profile) { | |
489 | pref = profile->learning; | |
490 | if (pref == &tomoyo_default_profile.preference) | |
491 | goto skip1; | |
492 | } | |
493 | tomoyo_io_printf(head, "%sPREFERENCE::%s={ " | |
494 | "verbose=%s max_entry=%u }\n", | |
495 | buffer, "learning", | |
496 | tomoyo_yesno(pref->learning_verbose), | |
497 | pref->learning_max_entry); | |
498 | skip1: | |
499 | if (profile) { | |
500 | pref = profile->permissive; | |
501 | if (pref == &tomoyo_default_profile.preference) | |
502 | goto skip2; | |
503 | } | |
504 | tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n", | |
505 | buffer, "permissive", | |
506 | tomoyo_yesno(pref->permissive_verbose)); | |
507 | skip2: | |
508 | if (profile) { | |
509 | pref = profile->enforcing; | |
510 | if (pref == &tomoyo_default_profile.preference) | |
511 | return; | |
512 | } | |
513 | tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n", | |
514 | buffer, "enforcing", | |
515 | tomoyo_yesno(pref->enforcing_verbose)); | |
516 | } | |
517 | ||
518 | static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config) | |
519 | { | |
520 | tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]); | |
521 | } | |
522 | ||
9590837b | 523 | /** |
57c2590f | 524 | * tomoyo_read_profile - Read profile table. |
9590837b KT |
525 | * |
526 | * @head: Pointer to "struct tomoyo_io_buffer". | |
9590837b | 527 | */ |
8fbe71f0 | 528 | static void tomoyo_read_profile(struct tomoyo_io_buffer *head) |
9590837b | 529 | { |
f23571e8 TH |
530 | u8 index; |
531 | const struct tomoyo_profile *profile; | |
532 | next: | |
533 | index = head->r.index; | |
534 | profile = tomoyo_profile_ptr[index]; | |
535 | switch (head->r.step) { | |
536 | case 0: | |
537 | tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); | |
538 | tomoyo_print_preference(head, -1); | |
539 | head->r.step++; | |
540 | break; | |
541 | case 1: | |
542 | for ( ; head->r.index < TOMOYO_MAX_PROFILES; | |
543 | head->r.index++) | |
544 | if (tomoyo_profile_ptr[head->r.index]) | |
545 | break; | |
546 | if (head->r.index == TOMOYO_MAX_PROFILES) | |
547 | return; | |
548 | head->r.step++; | |
549 | break; | |
550 | case 2: | |
551 | { | |
552 | const struct tomoyo_path_info *comment = | |
553 | profile->comment; | |
554 | tomoyo_io_printf(head, "%u-COMMENT=", index); | |
555 | tomoyo_set_string(head, comment ? comment->name : ""); | |
556 | tomoyo_set_lf(head); | |
557 | head->r.step++; | |
558 | } | |
559 | break; | |
560 | case 3: | |
561 | { | |
562 | tomoyo_io_printf(head, "%u-%s", index, "CONFIG"); | |
563 | tomoyo_print_config(head, profile->default_config); | |
564 | head->r.bit = 0; | |
565 | head->r.step++; | |
566 | } | |
567 | break; | |
568 | case 4: | |
569 | for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX | |
570 | + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { | |
571 | const u8 i = head->r.bit; | |
572 | const u8 config = profile->config[i]; | |
57c2590f TH |
573 | if (config == TOMOYO_CONFIG_USE_DEFAULT) |
574 | continue; | |
f23571e8 TH |
575 | tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::", |
576 | tomoyo_mac_keywords[i]); | |
577 | tomoyo_print_config(head, config); | |
578 | head->r.bit++; | |
579 | break; | |
580 | } | |
581 | if (head->r.bit == TOMOYO_MAX_MAC_INDEX | |
582 | + TOMOYO_MAX_MAC_CATEGORY_INDEX) { | |
583 | tomoyo_print_preference(head, index); | |
584 | head->r.index++; | |
585 | head->r.step = 1; | |
9590837b | 586 | } |
57c2590f | 587 | break; |
9590837b | 588 | } |
f23571e8 TH |
589 | if (tomoyo_flush(head)) |
590 | goto next; | |
9590837b KT |
591 | } |
592 | ||
e2bf6907 TH |
593 | static bool tomoyo_same_manager(const struct tomoyo_acl_head *a, |
594 | const struct tomoyo_acl_head *b) | |
36f5e1ff | 595 | { |
e2bf6907 TH |
596 | return container_of(a, struct tomoyo_manager, head)->manager == |
597 | container_of(b, struct tomoyo_manager, head)->manager; | |
36f5e1ff TH |
598 | } |
599 | ||
9590837b KT |
600 | /** |
601 | * tomoyo_update_manager_entry - Add a manager entry. | |
602 | * | |
603 | * @manager: The path to manager or the domainnamme. | |
604 | * @is_delete: True if it is a delete request. | |
605 | * | |
606 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
607 | * |
608 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
609 | */ |
610 | static int tomoyo_update_manager_entry(const char *manager, | |
611 | const bool is_delete) | |
612 | { | |
e2bf6907 | 613 | struct tomoyo_manager e = { }; |
36f5e1ff | 614 | int error; |
9590837b | 615 | |
75093152 TH |
616 | if (tomoyo_domain_def(manager)) { |
617 | if (!tomoyo_correct_domain(manager)) | |
9590837b | 618 | return -EINVAL; |
9e4b50e9 | 619 | e.is_domain = true; |
9590837b | 620 | } else { |
75093152 | 621 | if (!tomoyo_correct_path(manager)) |
9590837b KT |
622 | return -EINVAL; |
623 | } | |
9e4b50e9 TH |
624 | e.manager = tomoyo_get_name(manager); |
625 | if (!e.manager) | |
9590837b | 626 | return -ENOMEM; |
36f5e1ff | 627 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
a230f9e7 | 628 | &tomoyo_policy_list[TOMOYO_ID_MANAGER], |
e2bf6907 | 629 | tomoyo_same_manager); |
9e4b50e9 | 630 | tomoyo_put_name(e.manager); |
9590837b KT |
631 | return error; |
632 | } | |
633 | ||
634 | /** | |
e2bf6907 | 635 | * tomoyo_write_manager - Write manager policy. |
9590837b KT |
636 | * |
637 | * @head: Pointer to "struct tomoyo_io_buffer". | |
638 | * | |
639 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
640 | * |
641 | * Caller holds tomoyo_read_lock(). | |
9590837b | 642 | */ |
e2bf6907 | 643 | static int tomoyo_write_manager(struct tomoyo_io_buffer *head) |
9590837b KT |
644 | { |
645 | char *data = head->write_buf; | |
646 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
647 | ||
648 | if (!strcmp(data, "manage_by_non_root")) { | |
649 | tomoyo_manage_by_non_root = !is_delete; | |
650 | return 0; | |
651 | } | |
652 | return tomoyo_update_manager_entry(data, is_delete); | |
653 | } | |
654 | ||
655 | /** | |
e2bf6907 | 656 | * tomoyo_read_manager - Read manager policy. |
9590837b KT |
657 | * |
658 | * @head: Pointer to "struct tomoyo_io_buffer". | |
659 | * | |
fdb8ebb7 | 660 | * Caller holds tomoyo_read_lock(). |
9590837b | 661 | */ |
e2bf6907 | 662 | static void tomoyo_read_manager(struct tomoyo_io_buffer *head) |
9590837b | 663 | { |
f23571e8 | 664 | if (head->r.eof) |
8fbe71f0 | 665 | return; |
f23571e8 | 666 | list_for_each_cookie(head->r.acl, |
a230f9e7 | 667 | &tomoyo_policy_list[TOMOYO_ID_MANAGER]) { |
e2bf6907 | 668 | struct tomoyo_manager *ptr = |
f23571e8 | 669 | list_entry(head->r.acl, typeof(*ptr), head.list); |
82e0f001 | 670 | if (ptr->head.is_deleted) |
9590837b | 671 | continue; |
f23571e8 TH |
672 | if (!tomoyo_flush(head)) |
673 | return; | |
674 | tomoyo_set_string(head, ptr->manager->name); | |
675 | tomoyo_set_lf(head); | |
9590837b | 676 | } |
f23571e8 | 677 | head->r.eof = true; |
9590837b KT |
678 | } |
679 | ||
680 | /** | |
e2bf6907 | 681 | * tomoyo_manager - Check whether the current process is a policy manager. |
9590837b KT |
682 | * |
683 | * Returns true if the current process is permitted to modify policy | |
684 | * via /sys/kernel/security/tomoyo/ interface. | |
fdb8ebb7 TH |
685 | * |
686 | * Caller holds tomoyo_read_lock(). | |
9590837b | 687 | */ |
e2bf6907 | 688 | static bool tomoyo_manager(void) |
9590837b | 689 | { |
e2bf6907 | 690 | struct tomoyo_manager *ptr; |
9590837b KT |
691 | const char *exe; |
692 | const struct task_struct *task = current; | |
693 | const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; | |
694 | bool found = false; | |
695 | ||
696 | if (!tomoyo_policy_loaded) | |
697 | return true; | |
698 | if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) | |
699 | return false; | |
a230f9e7 TH |
700 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], |
701 | head.list) { | |
82e0f001 | 702 | if (!ptr->head.is_deleted && ptr->is_domain |
9590837b KT |
703 | && !tomoyo_pathcmp(domainname, ptr->manager)) { |
704 | found = true; | |
705 | break; | |
706 | } | |
707 | } | |
9590837b KT |
708 | if (found) |
709 | return true; | |
710 | exe = tomoyo_get_exe(); | |
711 | if (!exe) | |
712 | return false; | |
a230f9e7 TH |
713 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], |
714 | head.list) { | |
82e0f001 | 715 | if (!ptr->head.is_deleted && !ptr->is_domain |
9590837b KT |
716 | && !strcmp(exe, ptr->manager->name)) { |
717 | found = true; | |
718 | break; | |
719 | } | |
720 | } | |
9590837b KT |
721 | if (!found) { /* Reduce error messages. */ |
722 | static pid_t last_pid; | |
723 | const pid_t pid = current->pid; | |
724 | if (last_pid != pid) { | |
725 | printk(KERN_WARNING "%s ( %s ) is not permitted to " | |
726 | "update policies.\n", domainname->name, exe); | |
727 | last_pid = pid; | |
728 | } | |
729 | } | |
8e2d39a1 | 730 | kfree(exe); |
9590837b KT |
731 | return found; |
732 | } | |
733 | ||
734 | /** | |
75093152 | 735 | * tomoyo_select_one - Parse select command. |
9590837b KT |
736 | * |
737 | * @head: Pointer to "struct tomoyo_io_buffer". | |
738 | * @data: String to parse. | |
739 | * | |
740 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
741 | * |
742 | * Caller holds tomoyo_read_lock(). | |
9590837b | 743 | */ |
475e6fa3 | 744 | static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data) |
9590837b KT |
745 | { |
746 | unsigned int pid; | |
747 | struct tomoyo_domain_info *domain = NULL; | |
9b244373 | 748 | bool global_pid = false; |
9590837b | 749 | |
063821c8 | 750 | if (!strcmp(data, "allow_execute")) { |
f23571e8 | 751 | head->r.print_execute_only = true; |
063821c8 TH |
752 | return true; |
753 | } | |
9b244373 TH |
754 | if (sscanf(data, "pid=%u", &pid) == 1 || |
755 | (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { | |
9590837b | 756 | struct task_struct *p; |
1fcdc7c5 | 757 | rcu_read_lock(); |
9590837b | 758 | read_lock(&tasklist_lock); |
9b244373 TH |
759 | if (global_pid) |
760 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
761 | else | |
762 | p = find_task_by_vpid(pid); | |
9590837b KT |
763 | if (p) |
764 | domain = tomoyo_real_domain(p); | |
765 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 766 | rcu_read_unlock(); |
9590837b | 767 | } else if (!strncmp(data, "domain=", 7)) { |
75093152 | 768 | if (tomoyo_domain_def(data + 7)) |
9590837b | 769 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
770 | } else |
771 | return false; | |
772 | head->write_var1 = domain; | |
773 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
774 | if (!head->read_buf) | |
775 | return true; /* Do nothing if open(O_WRONLY). */ | |
f23571e8 TH |
776 | memset(&head->r, 0, sizeof(head->r)); |
777 | head->r.print_this_domain_only = true; | |
68eda8f5 DC |
778 | if (domain) |
779 | head->r.domain = &domain->list; | |
780 | else | |
781 | head->r.eof = 1; | |
9590837b | 782 | tomoyo_io_printf(head, "# select %s\n", data); |
475e6fa3 TH |
783 | if (domain && domain->is_deleted) |
784 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
9590837b KT |
785 | return true; |
786 | } | |
787 | ||
ccf135f5 TH |
788 | /** |
789 | * tomoyo_delete_domain - Delete a domain. | |
790 | * | |
791 | * @domainname: The name of domain. | |
792 | * | |
793 | * Returns 0. | |
fdb8ebb7 TH |
794 | * |
795 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
796 | */ |
797 | static int tomoyo_delete_domain(char *domainname) | |
798 | { | |
799 | struct tomoyo_domain_info *domain; | |
800 | struct tomoyo_path_info name; | |
801 | ||
802 | name.name = domainname; | |
803 | tomoyo_fill_path_info(&name); | |
29282381 TH |
804 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
805 | return 0; | |
ccf135f5 | 806 | /* Is there an active domain? */ |
fdb8ebb7 | 807 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
808 | /* Never delete tomoyo_kernel_domain */ |
809 | if (domain == &tomoyo_kernel_domain) | |
810 | continue; | |
811 | if (domain->is_deleted || | |
812 | tomoyo_pathcmp(domain->domainname, &name)) | |
813 | continue; | |
814 | domain->is_deleted = true; | |
815 | break; | |
816 | } | |
f737d95d | 817 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
818 | return 0; |
819 | } | |
820 | ||
17fcfbd9 | 821 | /** |
e2bf6907 | 822 | * tomoyo_write_domain2 - Write domain policy. |
17fcfbd9 TH |
823 | * |
824 | * @head: Pointer to "struct tomoyo_io_buffer". | |
825 | * | |
826 | * Returns 0 on success, negative value otherwise. | |
827 | * | |
828 | * Caller holds tomoyo_read_lock(). | |
829 | */ | |
e2bf6907 TH |
830 | static int tomoyo_write_domain2(char *data, struct tomoyo_domain_info *domain, |
831 | const bool is_delete) | |
17fcfbd9 TH |
832 | { |
833 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) | |
e2bf6907 TH |
834 | return tomoyo_write_mount(data, domain, is_delete); |
835 | return tomoyo_write_file(data, domain, is_delete); | |
17fcfbd9 TH |
836 | } |
837 | ||
9590837b | 838 | /** |
e2bf6907 | 839 | * tomoyo_write_domain - Write domain policy. |
9590837b KT |
840 | * |
841 | * @head: Pointer to "struct tomoyo_io_buffer". | |
842 | * | |
843 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
844 | * |
845 | * Caller holds tomoyo_read_lock(). | |
9590837b | 846 | */ |
e2bf6907 | 847 | static int tomoyo_write_domain(struct tomoyo_io_buffer *head) |
9590837b KT |
848 | { |
849 | char *data = head->write_buf; | |
850 | struct tomoyo_domain_info *domain = head->write_var1; | |
851 | bool is_delete = false; | |
852 | bool is_select = false; | |
9590837b KT |
853 | unsigned int profile; |
854 | ||
855 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
856 | is_delete = true; | |
857 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
858 | is_select = true; | |
75093152 | 859 | if (is_select && tomoyo_select_one(head, data)) |
9590837b KT |
860 | return 0; |
861 | /* Don't allow updating policies by non manager programs. */ | |
e2bf6907 | 862 | if (!tomoyo_manager()) |
9590837b | 863 | return -EPERM; |
75093152 | 864 | if (tomoyo_domain_def(data)) { |
9590837b KT |
865 | domain = NULL; |
866 | if (is_delete) | |
867 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 868 | else if (is_select) |
9590837b | 869 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 870 | else |
e2bf6907 | 871 | domain = tomoyo_assign_domain(data, 0); |
9590837b KT |
872 | head->write_var1 = domain; |
873 | return 0; | |
874 | } | |
875 | if (!domain) | |
876 | return -EINVAL; | |
877 | ||
878 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
879 | && profile < TOMOYO_MAX_PROFILES) { | |
880 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
881 | domain->profile = (u8) profile; | |
882 | return 0; | |
883 | } | |
884 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 885 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
886 | return 0; |
887 | } | |
9b244373 TH |
888 | if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { |
889 | domain->quota_warned = !is_delete; | |
890 | return 0; | |
891 | } | |
892 | if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { | |
893 | domain->transition_failed = !is_delete; | |
894 | return 0; | |
895 | } | |
e2bf6907 | 896 | return tomoyo_write_domain2(data, domain, is_delete); |
9590837b KT |
897 | } |
898 | ||
899 | /** | |
5db5a39b | 900 | * tomoyo_fns - Find next set bit. |
9590837b | 901 | * |
5db5a39b TH |
902 | * @perm: 8 bits value. |
903 | * @bit: First bit to find. | |
9590837b | 904 | * |
5db5a39b | 905 | * Returns next on-bit on success, 8 otherwise. |
9590837b | 906 | */ |
5db5a39b | 907 | static u8 tomoyo_fns(const u8 perm, u8 bit) |
9590837b | 908 | { |
5db5a39b TH |
909 | for ( ; bit < 8; bit++) |
910 | if (perm & (1 << bit)) | |
911 | break; | |
912 | return bit; | |
9590837b KT |
913 | } |
914 | ||
915 | /** | |
5db5a39b | 916 | * tomoyo_print_entry - Print an ACL entry. |
9590837b KT |
917 | * |
918 | * @head: Pointer to "struct tomoyo_io_buffer". | |
5db5a39b | 919 | * @acl: Pointer to an ACL entry. |
9590837b KT |
920 | * |
921 | * Returns true on success, false otherwise. | |
922 | */ | |
5db5a39b TH |
923 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, |
924 | struct tomoyo_acl_info *acl) | |
9590837b | 925 | { |
5db5a39b | 926 | const u8 acl_type = acl->type; |
f23571e8 | 927 | u8 bit; |
9590837b | 928 | |
5db5a39b TH |
929 | if (acl->is_deleted) |
930 | return true; | |
931 | next: | |
f23571e8 TH |
932 | bit = head->r.bit; |
933 | if (!tomoyo_flush(head)) | |
934 | return false; | |
935 | else if (acl_type == TOMOYO_TYPE_PATH_ACL) { | |
5db5a39b TH |
936 | struct tomoyo_path_acl *ptr = |
937 | container_of(acl, typeof(*ptr), head); | |
938 | const u16 perm = ptr->perm; | |
939 | for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { | |
940 | if (!(perm & (1 << bit))) | |
941 | continue; | |
f23571e8 | 942 | if (head->r.print_execute_only && |
5db5a39b TH |
943 | bit != TOMOYO_TYPE_EXECUTE) |
944 | continue; | |
945 | /* Print "read/write" instead of "read" and "write". */ | |
946 | if ((bit == TOMOYO_TYPE_READ || | |
947 | bit == TOMOYO_TYPE_WRITE) | |
948 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
949 | continue; | |
950 | break; | |
951 | } | |
952 | if (bit >= TOMOYO_MAX_PATH_OPERATION) | |
953 | goto done; | |
f23571e8 TH |
954 | tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]); |
955 | tomoyo_print_name_union(head, &ptr->name); | |
956 | } else if (head->r.print_execute_only) { | |
5db5a39b TH |
957 | return true; |
958 | } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { | |
959 | struct tomoyo_path2_acl *ptr = | |
960 | container_of(acl, typeof(*ptr), head); | |
961 | bit = tomoyo_fns(ptr->perm, bit); | |
962 | if (bit >= TOMOYO_MAX_PATH2_OPERATION) | |
963 | goto done; | |
f23571e8 TH |
964 | tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]); |
965 | tomoyo_print_name_union(head, &ptr->name1); | |
966 | tomoyo_print_name_union(head, &ptr->name2); | |
5db5a39b TH |
967 | } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
968 | struct tomoyo_path_number_acl *ptr = | |
969 | container_of(acl, typeof(*ptr), head); | |
970 | bit = tomoyo_fns(ptr->perm, bit); | |
971 | if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION) | |
972 | goto done; | |
f23571e8 TH |
973 | tomoyo_io_printf(head, "allow_%s", |
974 | tomoyo_path_number_keyword[bit]); | |
975 | tomoyo_print_name_union(head, &ptr->name); | |
976 | tomoyo_print_number_union(head, &ptr->number); | |
5db5a39b TH |
977 | } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { |
978 | struct tomoyo_mkdev_acl *ptr = | |
979 | container_of(acl, typeof(*ptr), head); | |
980 | bit = tomoyo_fns(ptr->perm, bit); | |
981 | if (bit >= TOMOYO_MAX_MKDEV_OPERATION) | |
982 | goto done; | |
f23571e8 TH |
983 | tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]); |
984 | tomoyo_print_name_union(head, &ptr->name); | |
985 | tomoyo_print_number_union(head, &ptr->mode); | |
986 | tomoyo_print_number_union(head, &ptr->major); | |
987 | tomoyo_print_number_union(head, &ptr->minor); | |
5db5a39b TH |
988 | } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { |
989 | struct tomoyo_mount_acl *ptr = | |
990 | container_of(acl, typeof(*ptr), head); | |
f23571e8 TH |
991 | tomoyo_io_printf(head, "allow_mount"); |
992 | tomoyo_print_name_union(head, &ptr->dev_name); | |
993 | tomoyo_print_name_union(head, &ptr->dir_name); | |
994 | tomoyo_print_name_union(head, &ptr->fs_type); | |
995 | tomoyo_print_number_union(head, &ptr->flags); | |
a1f9bb6a | 996 | } |
f23571e8 TH |
997 | head->r.bit = bit + 1; |
998 | tomoyo_io_printf(head, "\n"); | |
999 | if (acl_type != TOMOYO_TYPE_MOUNT_ACL) | |
5db5a39b | 1000 | goto next; |
5db5a39b | 1001 | done: |
f23571e8 TH |
1002 | head->r.bit = 0; |
1003 | return true; | |
1004 | } | |
1005 | ||
1006 | /** | |
1007 | * tomoyo_read_domain2 - Read domain policy. | |
1008 | * | |
1009 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1010 | * @domain: Pointer to "struct tomoyo_domain_info". | |
1011 | * | |
1012 | * Caller holds tomoyo_read_lock(). | |
1013 | * | |
1014 | * Returns true on success, false otherwise. | |
1015 | */ | |
1016 | static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, | |
1017 | struct tomoyo_domain_info *domain) | |
1018 | { | |
1019 | list_for_each_cookie(head->r.acl, &domain->acl_info_list) { | |
1020 | struct tomoyo_acl_info *ptr = | |
1021 | list_entry(head->r.acl, typeof(*ptr), list); | |
1022 | if (!tomoyo_print_entry(head, ptr)) | |
1023 | return false; | |
1024 | } | |
1025 | head->r.acl = NULL; | |
a1f9bb6a | 1026 | return true; |
a1f9bb6a TH |
1027 | } |
1028 | ||
9590837b | 1029 | /** |
e2bf6907 | 1030 | * tomoyo_read_domain - Read domain policy. |
9590837b KT |
1031 | * |
1032 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1033 | * | |
fdb8ebb7 | 1034 | * Caller holds tomoyo_read_lock(). |
9590837b | 1035 | */ |
e2bf6907 | 1036 | static void tomoyo_read_domain(struct tomoyo_io_buffer *head) |
9590837b | 1037 | { |
f23571e8 | 1038 | if (head->r.eof) |
8fbe71f0 | 1039 | return; |
f23571e8 | 1040 | list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { |
475e6fa3 | 1041 | struct tomoyo_domain_info *domain = |
f23571e8 TH |
1042 | list_entry(head->r.domain, typeof(*domain), list); |
1043 | switch (head->r.step) { | |
1044 | case 0: | |
1045 | if (domain->is_deleted && | |
1046 | !head->r.print_this_domain_only) | |
1047 | continue; | |
1048 | /* Print domainname and flags. */ | |
1049 | tomoyo_set_string(head, domain->domainname->name); | |
1050 | tomoyo_set_lf(head); | |
1051 | tomoyo_io_printf(head, | |
1052 | TOMOYO_KEYWORD_USE_PROFILE "%u\n", | |
1053 | domain->profile); | |
1054 | if (domain->quota_warned) | |
1055 | tomoyo_set_string(head, "quota_exceeded\n"); | |
1056 | if (domain->transition_failed) | |
1057 | tomoyo_set_string(head, "transition_failed\n"); | |
1058 | if (domain->ignore_global_allow_read) | |
1059 | tomoyo_set_string(head, | |
1060 | TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ | |
1061 | "\n"); | |
1062 | head->r.step++; | |
1063 | tomoyo_set_lf(head); | |
1064 | /* fall through */ | |
1065 | case 1: | |
1066 | if (!tomoyo_read_domain2(head, domain)) | |
1067 | return; | |
1068 | head->r.step++; | |
1069 | if (!tomoyo_set_lf(head)) | |
1070 | return; | |
1071 | /* fall through */ | |
1072 | case 2: | |
1073 | head->r.step = 0; | |
1074 | if (head->r.print_this_domain_only) | |
1075 | goto done; | |
9590837b | 1076 | } |
9590837b | 1077 | } |
f23571e8 TH |
1078 | done: |
1079 | head->r.eof = true; | |
9590837b KT |
1080 | } |
1081 | ||
1082 | /** | |
1083 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
1084 | * | |
1085 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1086 | * | |
1087 | * Returns 0 on success, -EINVAL otherwise. | |
1088 | * | |
1089 | * This is equivalent to doing | |
1090 | * | |
1091 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
9b244373 | 1092 | * /usr/sbin/tomoyo-loadpolicy -d |
fdb8ebb7 TH |
1093 | * |
1094 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1095 | */ |
1096 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1097 | { | |
1098 | char *data = head->write_buf; | |
1099 | char *cp = strchr(data, ' '); | |
1100 | struct tomoyo_domain_info *domain; | |
1101 | unsigned long profile; | |
1102 | ||
1103 | if (!cp) | |
1104 | return -EINVAL; | |
1105 | *cp = '\0'; | |
9590837b | 1106 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
1107 | if (strict_strtoul(data, 10, &profile)) |
1108 | return -EINVAL; | |
1109 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1110 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1111 | domain->profile = (u8) profile; | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1117 | * | |
1118 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1119 | * | |
1120 | * Returns list of profile number and domainname pairs. | |
1121 | * | |
1122 | * This is equivalent to doing | |
1123 | * | |
1124 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1125 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1126 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1127 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
1128 | * |
1129 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1130 | */ |
8fbe71f0 | 1131 | static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) |
9590837b | 1132 | { |
f23571e8 | 1133 | if (head->r.eof) |
8fbe71f0 | 1134 | return; |
f23571e8 | 1135 | list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { |
475e6fa3 | 1136 | struct tomoyo_domain_info *domain = |
f23571e8 | 1137 | list_entry(head->r.domain, typeof(*domain), list); |
9590837b KT |
1138 | if (domain->is_deleted) |
1139 | continue; | |
f23571e8 TH |
1140 | if (!tomoyo_flush(head)) |
1141 | return; | |
1142 | tomoyo_io_printf(head, "%u ", domain->profile); | |
1143 | tomoyo_set_string(head, domain->domainname->name); | |
1144 | tomoyo_set_lf(head); | |
9590837b | 1145 | } |
f23571e8 | 1146 | head->r.eof = true; |
9590837b KT |
1147 | } |
1148 | ||
1149 | /** | |
1150 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1151 | * | |
1152 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1153 | * | |
1154 | * Returns 0. | |
1155 | */ | |
1156 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1157 | { | |
f23571e8 | 1158 | head->r.eof = false; |
9590837b KT |
1159 | return 0; |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1164 | * | |
1165 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1166 | * | |
1167 | * Returns the domainname which the specified PID is in on success, | |
1168 | * empty string otherwise. | |
1169 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1170 | * using read()/write() interface rather than sysctl() interface. | |
1171 | */ | |
8fbe71f0 | 1172 | static void tomoyo_read_pid(struct tomoyo_io_buffer *head) |
9590837b | 1173 | { |
f23571e8 TH |
1174 | char *buf = head->write_buf; |
1175 | bool global_pid = false; | |
1176 | unsigned int pid; | |
1177 | struct task_struct *p; | |
1178 | struct tomoyo_domain_info *domain = NULL; | |
1179 | ||
1180 | /* Accessing write_buf is safe because head->io_sem is held. */ | |
1181 | if (!buf) { | |
1182 | head->r.eof = true; | |
1183 | return; /* Do nothing if open(O_RDONLY). */ | |
9590837b | 1184 | } |
f23571e8 TH |
1185 | if (head->r.w_pos || head->r.eof) |
1186 | return; | |
1187 | head->r.eof = true; | |
1188 | if (tomoyo_str_starts(&buf, "global-pid ")) | |
1189 | global_pid = true; | |
1190 | pid = (unsigned int) simple_strtoul(buf, NULL, 10); | |
1191 | rcu_read_lock(); | |
1192 | read_lock(&tasklist_lock); | |
1193 | if (global_pid) | |
1194 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
1195 | else | |
1196 | p = find_task_by_vpid(pid); | |
1197 | if (p) | |
1198 | domain = tomoyo_real_domain(p); | |
1199 | read_unlock(&tasklist_lock); | |
1200 | rcu_read_unlock(); | |
1201 | if (!domain) | |
1202 | return; | |
1203 | tomoyo_io_printf(head, "%u %u ", pid, domain->profile); | |
1204 | tomoyo_set_string(head, domain->domainname->name); | |
9590837b KT |
1205 | } |
1206 | ||
5448ec4f TH |
1207 | static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { |
1208 | [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] | |
1209 | = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN, | |
1210 | [TOMOYO_TRANSITION_CONTROL_INITIALIZE] | |
1211 | = TOMOYO_KEYWORD_INITIALIZE_DOMAIN, | |
1212 | [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN, | |
1213 | [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN | |
1214 | }; | |
1215 | ||
e2bf6907 TH |
1216 | static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { |
1217 | [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP, | |
1218 | [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP | |
1219 | }; | |
1220 | ||
9590837b | 1221 | /** |
e2bf6907 | 1222 | * tomoyo_write_exception - Write exception policy. |
9590837b KT |
1223 | * |
1224 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1225 | * | |
1226 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1227 | * |
1228 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1229 | */ |
e2bf6907 | 1230 | static int tomoyo_write_exception(struct tomoyo_io_buffer *head) |
9590837b KT |
1231 | { |
1232 | char *data = head->write_buf; | |
1233 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
5448ec4f | 1234 | u8 i; |
e2bf6907 TH |
1235 | static const struct { |
1236 | const char *keyword; | |
1237 | int (*write) (char *, const bool); | |
1238 | } tomoyo_callback[4] = { | |
1239 | { TOMOYO_KEYWORD_AGGREGATOR, tomoyo_write_aggregator }, | |
1240 | { TOMOYO_KEYWORD_FILE_PATTERN, tomoyo_write_pattern }, | |
1241 | { TOMOYO_KEYWORD_DENY_REWRITE, tomoyo_write_no_rewrite }, | |
1242 | { TOMOYO_KEYWORD_ALLOW_READ, tomoyo_write_globally_readable }, | |
1243 | }; | |
1244 | ||
1245 | for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) | |
5448ec4f TH |
1246 | if (tomoyo_str_starts(&data, tomoyo_transition_type[i])) |
1247 | return tomoyo_write_transition_control(data, is_delete, | |
1248 | i); | |
e2bf6907 TH |
1249 | for (i = 0; i < 4; i++) |
1250 | if (tomoyo_str_starts(&data, tomoyo_callback[i].keyword)) | |
1251 | return tomoyo_callback[i].write(data, is_delete); | |
1252 | for (i = 0; i < TOMOYO_MAX_GROUP; i++) | |
1253 | if (tomoyo_str_starts(&data, tomoyo_group_name[i])) | |
1254 | return tomoyo_write_group(data, is_delete, i); | |
9590837b KT |
1255 | return -EINVAL; |
1256 | } | |
1257 | ||
1258 | /** | |
31845e8c | 1259 | * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list. |
9590837b KT |
1260 | * |
1261 | * @head: Pointer to "struct tomoyo_io_buffer". | |
31845e8c TH |
1262 | * @idx: Index number. |
1263 | * | |
1264 | * Returns true on success, false otherwise. | |
9590837b | 1265 | * |
fdb8ebb7 | 1266 | * Caller holds tomoyo_read_lock(). |
9590837b | 1267 | */ |
31845e8c | 1268 | static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) |
9590837b | 1269 | { |
f23571e8 | 1270 | list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) { |
31845e8c | 1271 | struct tomoyo_group *group = |
f23571e8 TH |
1272 | list_entry(head->r.group, typeof(*group), list); |
1273 | list_for_each_cookie(head->r.acl, &group->member_list) { | |
31845e8c | 1274 | struct tomoyo_acl_head *ptr = |
f23571e8 | 1275 | list_entry(head->r.acl, typeof(*ptr), list); |
31845e8c TH |
1276 | if (ptr->is_deleted) |
1277 | continue; | |
f23571e8 TH |
1278 | if (!tomoyo_flush(head)) |
1279 | return false; | |
1280 | tomoyo_set_string(head, tomoyo_group_name[idx]); | |
1281 | tomoyo_set_string(head, group->group_name->name); | |
31845e8c | 1282 | if (idx == TOMOYO_PATH_GROUP) { |
f23571e8 TH |
1283 | tomoyo_set_space(head); |
1284 | tomoyo_set_string(head, container_of | |
1285 | (ptr, struct tomoyo_path_group, | |
1286 | head)->member_name->name); | |
31845e8c | 1287 | } else if (idx == TOMOYO_NUMBER_GROUP) { |
f23571e8 TH |
1288 | tomoyo_print_number_union(head, &container_of |
1289 | (ptr, | |
1290 | struct tomoyo_number_group, | |
1291 | head)->number); | |
31845e8c | 1292 | } |
f23571e8 | 1293 | tomoyo_set_lf(head); |
31845e8c | 1294 | } |
f23571e8 | 1295 | head->r.acl = NULL; |
31845e8c | 1296 | } |
f23571e8 | 1297 | head->r.group = NULL; |
31845e8c TH |
1298 | return true; |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. | |
1303 | * | |
1304 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1305 | * @idx: Index number. | |
1306 | * | |
1307 | * Returns true on success, false otherwise. | |
1308 | * | |
1309 | * Caller holds tomoyo_read_lock(). | |
1310 | */ | |
1311 | static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) | |
1312 | { | |
f23571e8 | 1313 | list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) { |
475e6fa3 | 1314 | struct tomoyo_acl_head *acl = |
f23571e8 | 1315 | container_of(head->r.acl, typeof(*acl), list); |
31845e8c TH |
1316 | if (acl->is_deleted) |
1317 | continue; | |
f23571e8 TH |
1318 | if (!tomoyo_flush(head)) |
1319 | return false; | |
31845e8c | 1320 | switch (idx) { |
5448ec4f | 1321 | case TOMOYO_ID_TRANSITION_CONTROL: |
31845e8c | 1322 | { |
5448ec4f | 1323 | struct tomoyo_transition_control *ptr = |
31845e8c | 1324 | container_of(acl, typeof(*ptr), head); |
f23571e8 TH |
1325 | tomoyo_set_string(head, |
1326 | tomoyo_transition_type | |
1327 | [ptr->type]); | |
5448ec4f | 1328 | if (ptr->program) |
f23571e8 TH |
1329 | tomoyo_set_string(head, |
1330 | ptr->program->name); | |
1331 | if (ptr->program && ptr->domainname) | |
1332 | tomoyo_set_string(head, " from "); | |
5448ec4f | 1333 | if (ptr->domainname) |
f23571e8 TH |
1334 | tomoyo_set_string(head, |
1335 | ptr->domainname-> | |
1336 | name); | |
31845e8c TH |
1337 | } |
1338 | break; | |
1339 | case TOMOYO_ID_GLOBALLY_READABLE: | |
1340 | { | |
e2bf6907 TH |
1341 | struct tomoyo_readable_file *ptr = |
1342 | container_of(acl, typeof(*ptr), head); | |
f23571e8 TH |
1343 | tomoyo_set_string(head, |
1344 | TOMOYO_KEYWORD_ALLOW_READ); | |
1345 | tomoyo_set_string(head, ptr->filename->name); | |
31845e8c TH |
1346 | } |
1347 | break; | |
31845e8c TH |
1348 | case TOMOYO_ID_AGGREGATOR: |
1349 | { | |
e2bf6907 | 1350 | struct tomoyo_aggregator *ptr = |
31845e8c | 1351 | container_of(acl, typeof(*ptr), head); |
f23571e8 TH |
1352 | tomoyo_set_string(head, |
1353 | TOMOYO_KEYWORD_AGGREGATOR); | |
1354 | tomoyo_set_string(head, | |
1355 | ptr->original_name->name); | |
1356 | tomoyo_set_space(head); | |
1357 | tomoyo_set_string(head, | |
1358 | ptr->aggregated_name->name); | |
31845e8c TH |
1359 | } |
1360 | break; | |
1361 | case TOMOYO_ID_PATTERN: | |
1362 | { | |
e2bf6907 | 1363 | struct tomoyo_no_pattern *ptr = |
31845e8c | 1364 | container_of(acl, typeof(*ptr), head); |
f23571e8 TH |
1365 | tomoyo_set_string(head, |
1366 | TOMOYO_KEYWORD_FILE_PATTERN); | |
1367 | tomoyo_set_string(head, ptr->pattern->name); | |
31845e8c TH |
1368 | } |
1369 | break; | |
1370 | case TOMOYO_ID_NO_REWRITE: | |
1371 | { | |
e2bf6907 | 1372 | struct tomoyo_no_rewrite *ptr = |
31845e8c | 1373 | container_of(acl, typeof(*ptr), head); |
f23571e8 TH |
1374 | tomoyo_set_string(head, |
1375 | TOMOYO_KEYWORD_DENY_REWRITE); | |
1376 | tomoyo_set_string(head, ptr->pattern->name); | |
31845e8c TH |
1377 | } |
1378 | break; | |
1379 | default: | |
1380 | continue; | |
9590837b | 1381 | } |
f23571e8 | 1382 | tomoyo_set_lf(head); |
9590837b | 1383 | } |
f23571e8 | 1384 | head->r.acl = NULL; |
31845e8c TH |
1385 | return true; |
1386 | } | |
1387 | ||
1388 | /** | |
e2bf6907 | 1389 | * tomoyo_read_exception - Read exception policy. |
31845e8c TH |
1390 | * |
1391 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1392 | * | |
1393 | * Caller holds tomoyo_read_lock(). | |
1394 | */ | |
e2bf6907 | 1395 | static void tomoyo_read_exception(struct tomoyo_io_buffer *head) |
31845e8c | 1396 | { |
f23571e8 | 1397 | if (head->r.eof) |
31845e8c | 1398 | return; |
f23571e8 TH |
1399 | while (head->r.step < TOMOYO_MAX_POLICY && |
1400 | tomoyo_read_policy(head, head->r.step)) | |
1401 | head->r.step++; | |
1402 | if (head->r.step < TOMOYO_MAX_POLICY) | |
31845e8c | 1403 | return; |
f23571e8 TH |
1404 | while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && |
1405 | tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY)) | |
1406 | head->r.step++; | |
1407 | if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) | |
31845e8c | 1408 | return; |
f23571e8 | 1409 | head->r.eof = true; |
9590837b KT |
1410 | } |
1411 | ||
17fcfbd9 TH |
1412 | /** |
1413 | * tomoyo_print_header - Get header line of audit log. | |
1414 | * | |
1415 | * @r: Pointer to "struct tomoyo_request_info". | |
1416 | * | |
1417 | * Returns string representation. | |
1418 | * | |
1419 | * This function uses kmalloc(), so caller must kfree() if this function | |
1420 | * didn't return NULL. | |
1421 | */ | |
1422 | static char *tomoyo_print_header(struct tomoyo_request_info *r) | |
1423 | { | |
17fcfbd9 TH |
1424 | struct timeval tv; |
1425 | const pid_t gpid = task_pid_nr(current); | |
1426 | static const int tomoyo_buffer_len = 4096; | |
1427 | char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); | |
c8da96e8 | 1428 | pid_t ppid; |
17fcfbd9 TH |
1429 | if (!buffer) |
1430 | return NULL; | |
1431 | do_gettimeofday(&tv); | |
c8da96e8 BH |
1432 | rcu_read_lock(); |
1433 | ppid = task_tgid_vnr(current->real_parent); | |
1434 | rcu_read_unlock(); | |
17fcfbd9 TH |
1435 | snprintf(buffer, tomoyo_buffer_len - 1, |
1436 | "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" | |
1437 | " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" | |
1438 | " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", | |
f23571e8 | 1439 | tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid, |
c8da96e8 | 1440 | task_tgid_vnr(current), ppid, |
17fcfbd9 TH |
1441 | current_uid(), current_gid(), current_euid(), |
1442 | current_egid(), current_suid(), current_sgid(), | |
1443 | current_fsuid(), current_fsgid()); | |
1444 | return buffer; | |
1445 | } | |
1446 | ||
1447 | /** | |
1448 | * tomoyo_init_audit_log - Allocate buffer for audit logs. | |
1449 | * | |
1450 | * @len: Required size. | |
1451 | * @r: Pointer to "struct tomoyo_request_info". | |
1452 | * | |
1453 | * Returns pointer to allocated memory. | |
1454 | * | |
1455 | * The @len is updated to add the header lines' size on success. | |
1456 | * | |
1457 | * This function uses kzalloc(), so caller must kfree() if this function | |
1458 | * didn't return NULL. | |
1459 | */ | |
1460 | static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) | |
1461 | { | |
1462 | char *buf = NULL; | |
1463 | const char *header; | |
1464 | const char *domainname; | |
1465 | if (!r->domain) | |
1466 | r->domain = tomoyo_domain(); | |
1467 | domainname = r->domain->domainname->name; | |
1468 | header = tomoyo_print_header(r); | |
1469 | if (!header) | |
1470 | return NULL; | |
1471 | *len += strlen(domainname) + strlen(header) + 10; | |
1472 | buf = kzalloc(*len, GFP_NOFS); | |
1473 | if (buf) | |
1474 | snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); | |
1475 | kfree(header); | |
1476 | return buf; | |
1477 | } | |
1478 | ||
1479 | /* Wait queue for tomoyo_query_list. */ | |
1480 | static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); | |
1481 | ||
1482 | /* Lock for manipulating tomoyo_query_list. */ | |
1483 | static DEFINE_SPINLOCK(tomoyo_query_list_lock); | |
1484 | ||
1485 | /* Structure for query. */ | |
e2bf6907 | 1486 | struct tomoyo_query { |
17fcfbd9 TH |
1487 | struct list_head list; |
1488 | char *query; | |
1489 | int query_len; | |
1490 | unsigned int serial; | |
1491 | int timer; | |
1492 | int answer; | |
1493 | }; | |
1494 | ||
e2bf6907 | 1495 | /* The list for "struct tomoyo_query". */ |
17fcfbd9 TH |
1496 | static LIST_HEAD(tomoyo_query_list); |
1497 | ||
1498 | /* | |
1499 | * Number of "struct file" referring /sys/kernel/security/tomoyo/query | |
1500 | * interface. | |
1501 | */ | |
1502 | static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); | |
1503 | ||
1504 | /** | |
1505 | * tomoyo_supervisor - Ask for the supervisor's decision. | |
1506 | * | |
1507 | * @r: Pointer to "struct tomoyo_request_info". | |
1508 | * @fmt: The printf()'s format string, followed by parameters. | |
1509 | * | |
1510 | * Returns 0 if the supervisor decided to permit the access request which | |
1511 | * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the | |
1512 | * supervisor decided to retry the access request which violated the policy in | |
1513 | * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. | |
1514 | */ | |
1515 | int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) | |
1516 | { | |
1517 | va_list args; | |
1518 | int error = -EPERM; | |
1519 | int pos; | |
1520 | int len; | |
1521 | static unsigned int tomoyo_serial; | |
e2bf6907 | 1522 | struct tomoyo_query *entry = NULL; |
17fcfbd9 TH |
1523 | bool quota_exceeded = false; |
1524 | char *header; | |
1525 | switch (r->mode) { | |
1526 | char *buffer; | |
1527 | case TOMOYO_CONFIG_LEARNING: | |
1528 | if (!tomoyo_domain_quota_is_ok(r)) | |
1529 | return 0; | |
1530 | va_start(args, fmt); | |
1531 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; | |
1532 | va_end(args); | |
1533 | buffer = kmalloc(len, GFP_NOFS); | |
1534 | if (!buffer) | |
1535 | return 0; | |
1536 | va_start(args, fmt); | |
1537 | vsnprintf(buffer, len - 1, fmt, args); | |
1538 | va_end(args); | |
1539 | tomoyo_normalize_line(buffer); | |
e2bf6907 | 1540 | tomoyo_write_domain2(buffer, r->domain, false); |
17fcfbd9 TH |
1541 | kfree(buffer); |
1542 | /* fall through */ | |
1543 | case TOMOYO_CONFIG_PERMISSIVE: | |
1544 | return 0; | |
1545 | } | |
1546 | if (!r->domain) | |
1547 | r->domain = tomoyo_domain(); | |
1548 | if (!atomic_read(&tomoyo_query_observers)) | |
1549 | return -EPERM; | |
1550 | va_start(args, fmt); | |
1551 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; | |
1552 | va_end(args); | |
1553 | header = tomoyo_init_audit_log(&len, r); | |
1554 | if (!header) | |
1555 | goto out; | |
e2bf6907 TH |
1556 | entry = kzalloc(sizeof(*entry), GFP_NOFS); |
1557 | if (!entry) | |
17fcfbd9 | 1558 | goto out; |
e2bf6907 TH |
1559 | entry->query = kzalloc(len, GFP_NOFS); |
1560 | if (!entry->query) | |
17fcfbd9 | 1561 | goto out; |
e2bf6907 | 1562 | len = ksize(entry->query); |
17fcfbd9 TH |
1563 | spin_lock(&tomoyo_query_list_lock); |
1564 | if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + | |
e2bf6907 | 1565 | sizeof(*entry) >= tomoyo_quota_for_query) { |
17fcfbd9 TH |
1566 | quota_exceeded = true; |
1567 | } else { | |
e2bf6907 TH |
1568 | tomoyo_query_memory_size += len + sizeof(*entry); |
1569 | entry->serial = tomoyo_serial++; | |
17fcfbd9 TH |
1570 | } |
1571 | spin_unlock(&tomoyo_query_list_lock); | |
1572 | if (quota_exceeded) | |
1573 | goto out; | |
e2bf6907 TH |
1574 | pos = snprintf(entry->query, len - 1, "Q%u-%hu\n%s", |
1575 | entry->serial, r->retry, header); | |
17fcfbd9 TH |
1576 | kfree(header); |
1577 | header = NULL; | |
1578 | va_start(args, fmt); | |
e2bf6907 TH |
1579 | vsnprintf(entry->query + pos, len - 1 - pos, fmt, args); |
1580 | entry->query_len = strlen(entry->query) + 1; | |
17fcfbd9 TH |
1581 | va_end(args); |
1582 | spin_lock(&tomoyo_query_list_lock); | |
e2bf6907 | 1583 | list_add_tail(&entry->list, &tomoyo_query_list); |
17fcfbd9 TH |
1584 | spin_unlock(&tomoyo_query_list_lock); |
1585 | /* Give 10 seconds for supervisor's opinion. */ | |
e2bf6907 TH |
1586 | for (entry->timer = 0; |
1587 | atomic_read(&tomoyo_query_observers) && entry->timer < 100; | |
1588 | entry->timer++) { | |
17fcfbd9 TH |
1589 | wake_up(&tomoyo_query_wait); |
1590 | set_current_state(TASK_INTERRUPTIBLE); | |
1591 | schedule_timeout(HZ / 10); | |
e2bf6907 | 1592 | if (entry->answer) |
17fcfbd9 TH |
1593 | break; |
1594 | } | |
1595 | spin_lock(&tomoyo_query_list_lock); | |
e2bf6907 TH |
1596 | list_del(&entry->list); |
1597 | tomoyo_query_memory_size -= len + sizeof(*entry); | |
17fcfbd9 | 1598 | spin_unlock(&tomoyo_query_list_lock); |
e2bf6907 | 1599 | switch (entry->answer) { |
17fcfbd9 TH |
1600 | case 3: /* Asked to retry by administrator. */ |
1601 | error = TOMOYO_RETRY_REQUEST; | |
1602 | r->retry++; | |
1603 | break; | |
1604 | case 1: | |
1605 | /* Granted by administrator. */ | |
1606 | error = 0; | |
1607 | break; | |
1608 | case 0: | |
1609 | /* Timed out. */ | |
1610 | break; | |
1611 | default: | |
1612 | /* Rejected by administrator. */ | |
1613 | break; | |
1614 | } | |
1615 | out: | |
e2bf6907 TH |
1616 | if (entry) |
1617 | kfree(entry->query); | |
1618 | kfree(entry); | |
17fcfbd9 TH |
1619 | kfree(header); |
1620 | return error; | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. | |
1625 | * | |
1626 | * @file: Pointer to "struct file". | |
1627 | * @wait: Pointer to "poll_table". | |
1628 | * | |
1629 | * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. | |
1630 | * | |
1631 | * Waits for access requests which violated policy in enforcing mode. | |
1632 | */ | |
1633 | static int tomoyo_poll_query(struct file *file, poll_table *wait) | |
1634 | { | |
1635 | struct list_head *tmp; | |
1636 | bool found = false; | |
1637 | u8 i; | |
1638 | for (i = 0; i < 2; i++) { | |
1639 | spin_lock(&tomoyo_query_list_lock); | |
1640 | list_for_each(tmp, &tomoyo_query_list) { | |
e2bf6907 TH |
1641 | struct tomoyo_query *ptr = |
1642 | list_entry(tmp, typeof(*ptr), list); | |
17fcfbd9 TH |
1643 | if (ptr->answer) |
1644 | continue; | |
1645 | found = true; | |
1646 | break; | |
1647 | } | |
1648 | spin_unlock(&tomoyo_query_list_lock); | |
1649 | if (found) | |
1650 | return POLLIN | POLLRDNORM; | |
1651 | if (i) | |
1652 | break; | |
1653 | poll_wait(file, &tomoyo_query_wait, wait); | |
1654 | } | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | /** | |
1659 | * tomoyo_read_query - Read access requests which violated policy in enforcing mode. | |
1660 | * | |
1661 | * @head: Pointer to "struct tomoyo_io_buffer". | |
17fcfbd9 | 1662 | */ |
8fbe71f0 | 1663 | static void tomoyo_read_query(struct tomoyo_io_buffer *head) |
17fcfbd9 TH |
1664 | { |
1665 | struct list_head *tmp; | |
1666 | int pos = 0; | |
1667 | int len = 0; | |
1668 | char *buf; | |
f23571e8 | 1669 | if (head->r.w_pos) |
8fbe71f0 | 1670 | return; |
17fcfbd9 TH |
1671 | if (head->read_buf) { |
1672 | kfree(head->read_buf); | |
1673 | head->read_buf = NULL; | |
17fcfbd9 TH |
1674 | } |
1675 | spin_lock(&tomoyo_query_list_lock); | |
1676 | list_for_each(tmp, &tomoyo_query_list) { | |
e2bf6907 | 1677 | struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
17fcfbd9 TH |
1678 | if (ptr->answer) |
1679 | continue; | |
f23571e8 | 1680 | if (pos++ != head->r.query_index) |
17fcfbd9 TH |
1681 | continue; |
1682 | len = ptr->query_len; | |
1683 | break; | |
1684 | } | |
1685 | spin_unlock(&tomoyo_query_list_lock); | |
1686 | if (!len) { | |
f23571e8 | 1687 | head->r.query_index = 0; |
8fbe71f0 | 1688 | return; |
17fcfbd9 TH |
1689 | } |
1690 | buf = kzalloc(len, GFP_NOFS); | |
1691 | if (!buf) | |
8fbe71f0 | 1692 | return; |
17fcfbd9 TH |
1693 | pos = 0; |
1694 | spin_lock(&tomoyo_query_list_lock); | |
1695 | list_for_each(tmp, &tomoyo_query_list) { | |
e2bf6907 | 1696 | struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
17fcfbd9 TH |
1697 | if (ptr->answer) |
1698 | continue; | |
f23571e8 | 1699 | if (pos++ != head->r.query_index) |
17fcfbd9 TH |
1700 | continue; |
1701 | /* | |
1702 | * Some query can be skipped because tomoyo_query_list | |
1703 | * can change, but I don't care. | |
1704 | */ | |
1705 | if (len == ptr->query_len) | |
1706 | memmove(buf, ptr->query, len); | |
1707 | break; | |
1708 | } | |
1709 | spin_unlock(&tomoyo_query_list_lock); | |
1710 | if (buf[0]) { | |
17fcfbd9 | 1711 | head->read_buf = buf; |
f23571e8 TH |
1712 | head->r.w[head->r.w_pos++] = buf; |
1713 | head->r.query_index++; | |
17fcfbd9 TH |
1714 | } else { |
1715 | kfree(buf); | |
1716 | } | |
17fcfbd9 TH |
1717 | } |
1718 | ||
1719 | /** | |
1720 | * tomoyo_write_answer - Write the supervisor's decision. | |
1721 | * | |
1722 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1723 | * | |
1724 | * Returns 0 on success, -EINVAL otherwise. | |
1725 | */ | |
1726 | static int tomoyo_write_answer(struct tomoyo_io_buffer *head) | |
1727 | { | |
1728 | char *data = head->write_buf; | |
1729 | struct list_head *tmp; | |
1730 | unsigned int serial; | |
1731 | unsigned int answer; | |
1732 | spin_lock(&tomoyo_query_list_lock); | |
1733 | list_for_each(tmp, &tomoyo_query_list) { | |
e2bf6907 | 1734 | struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
17fcfbd9 TH |
1735 | ptr->timer = 0; |
1736 | } | |
1737 | spin_unlock(&tomoyo_query_list_lock); | |
1738 | if (sscanf(data, "A%u=%u", &serial, &answer) != 2) | |
1739 | return -EINVAL; | |
1740 | spin_lock(&tomoyo_query_list_lock); | |
1741 | list_for_each(tmp, &tomoyo_query_list) { | |
e2bf6907 | 1742 | struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); |
17fcfbd9 TH |
1743 | if (ptr->serial != serial) |
1744 | continue; | |
1745 | if (!ptr->answer) | |
1746 | ptr->answer = answer; | |
1747 | break; | |
1748 | } | |
1749 | spin_unlock(&tomoyo_query_list_lock); | |
1750 | return 0; | |
1751 | } | |
1752 | ||
9590837b KT |
1753 | /** |
1754 | * tomoyo_read_version: Get version. | |
1755 | * | |
1756 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1757 | * | |
1758 | * Returns version information. | |
1759 | */ | |
8fbe71f0 | 1760 | static void tomoyo_read_version(struct tomoyo_io_buffer *head) |
9590837b | 1761 | { |
f23571e8 | 1762 | if (!head->r.eof) { |
e6f6a4cc | 1763 | tomoyo_io_printf(head, "2.3.0"); |
f23571e8 | 1764 | head->r.eof = true; |
9590837b | 1765 | } |
9590837b KT |
1766 | } |
1767 | ||
1768 | /** | |
1769 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1770 | * | |
1771 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1772 | * | |
1773 | * Returns the current process's domainname. | |
1774 | */ | |
8fbe71f0 | 1775 | static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) |
9590837b | 1776 | { |
f23571e8 | 1777 | if (!head->r.eof) { |
9590837b KT |
1778 | /* |
1779 | * tomoyo_domain()->domainname != NULL | |
1780 | * because every process belongs to a domain and | |
1781 | * the domain's name cannot be NULL. | |
1782 | */ | |
1783 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
f23571e8 | 1784 | head->r.eof = true; |
9590837b | 1785 | } |
9590837b KT |
1786 | } |
1787 | ||
1788 | /** | |
1789 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1790 | * | |
1791 | * @type: Type of interface. | |
1792 | * @file: Pointer to "struct file". | |
1793 | * | |
1794 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1795 | * |
1796 | * Caller acquires tomoyo_read_lock(). | |
9590837b | 1797 | */ |
c3ef1500 | 1798 | int tomoyo_open_control(const u8 type, struct file *file) |
9590837b | 1799 | { |
4e5d6f7e | 1800 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1801 | |
1802 | if (!head) | |
1803 | return -ENOMEM; | |
1804 | mutex_init(&head->io_sem); | |
17fcfbd9 | 1805 | head->type = type; |
9590837b KT |
1806 | switch (type) { |
1807 | case TOMOYO_DOMAINPOLICY: | |
1808 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
e2bf6907 TH |
1809 | head->write = tomoyo_write_domain; |
1810 | head->read = tomoyo_read_domain; | |
9590837b KT |
1811 | break; |
1812 | case TOMOYO_EXCEPTIONPOLICY: | |
1813 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
e2bf6907 TH |
1814 | head->write = tomoyo_write_exception; |
1815 | head->read = tomoyo_read_exception; | |
9590837b KT |
1816 | break; |
1817 | case TOMOYO_SELFDOMAIN: | |
1818 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1819 | head->read = tomoyo_read_self_domain; | |
1820 | break; | |
1821 | case TOMOYO_DOMAIN_STATUS: | |
1822 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1823 | head->write = tomoyo_write_domain_profile; | |
1824 | head->read = tomoyo_read_domain_profile; | |
1825 | break; | |
1826 | case TOMOYO_PROCESS_STATUS: | |
1827 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1828 | head->write = tomoyo_write_pid; | |
1829 | head->read = tomoyo_read_pid; | |
1830 | break; | |
1831 | case TOMOYO_VERSION: | |
1832 | /* /sys/kernel/security/tomoyo/version */ | |
1833 | head->read = tomoyo_read_version; | |
1834 | head->readbuf_size = 128; | |
1835 | break; | |
1836 | case TOMOYO_MEMINFO: | |
1837 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1838 | head->write = tomoyo_write_memory_quota; | |
1839 | head->read = tomoyo_read_memory_counter; | |
1840 | head->readbuf_size = 512; | |
1841 | break; | |
1842 | case TOMOYO_PROFILE: | |
1843 | /* /sys/kernel/security/tomoyo/profile */ | |
1844 | head->write = tomoyo_write_profile; | |
1845 | head->read = tomoyo_read_profile; | |
1846 | break; | |
17fcfbd9 TH |
1847 | case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
1848 | head->poll = tomoyo_poll_query; | |
1849 | head->write = tomoyo_write_answer; | |
1850 | head->read = tomoyo_read_query; | |
1851 | break; | |
9590837b KT |
1852 | case TOMOYO_MANAGER: |
1853 | /* /sys/kernel/security/tomoyo/manager */ | |
e2bf6907 TH |
1854 | head->write = tomoyo_write_manager; |
1855 | head->read = tomoyo_read_manager; | |
9590837b KT |
1856 | break; |
1857 | } | |
1858 | if (!(file->f_mode & FMODE_READ)) { | |
1859 | /* | |
1860 | * No need to allocate read_buf since it is not opened | |
1861 | * for reading. | |
1862 | */ | |
1863 | head->read = NULL; | |
17fcfbd9 TH |
1864 | head->poll = NULL; |
1865 | } else if (!head->poll) { | |
1866 | /* Don't allocate read_buf for poll() access. */ | |
9590837b KT |
1867 | if (!head->readbuf_size) |
1868 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 1869 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 1870 | if (!head->read_buf) { |
8e2d39a1 | 1871 | kfree(head); |
9590837b KT |
1872 | return -ENOMEM; |
1873 | } | |
1874 | } | |
1875 | if (!(file->f_mode & FMODE_WRITE)) { | |
1876 | /* | |
1877 | * No need to allocate write_buf since it is not opened | |
1878 | * for writing. | |
1879 | */ | |
1880 | head->write = NULL; | |
1881 | } else if (head->write) { | |
1882 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 1883 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 1884 | if (!head->write_buf) { |
8e2d39a1 TH |
1885 | kfree(head->read_buf); |
1886 | kfree(head); | |
9590837b KT |
1887 | return -ENOMEM; |
1888 | } | |
1889 | } | |
17fcfbd9 TH |
1890 | if (type != TOMOYO_QUERY) |
1891 | head->reader_idx = tomoyo_read_lock(); | |
9590837b KT |
1892 | file->private_data = head; |
1893 | /* | |
1894 | * Call the handler now if the file is | |
1895 | * /sys/kernel/security/tomoyo/self_domain | |
1896 | * so that the user can use | |
1897 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1898 | * to know the current process's domainname. | |
1899 | */ | |
1900 | if (type == TOMOYO_SELFDOMAIN) | |
1901 | tomoyo_read_control(file, NULL, 0); | |
17fcfbd9 TH |
1902 | /* |
1903 | * If the file is /sys/kernel/security/tomoyo/query , increment the | |
1904 | * observer counter. | |
1905 | * The obserber counter is used by tomoyo_supervisor() to see if | |
1906 | * there is some process monitoring /sys/kernel/security/tomoyo/query. | |
1907 | */ | |
1908 | else if (type == TOMOYO_QUERY) | |
1909 | atomic_inc(&tomoyo_query_observers); | |
9590837b KT |
1910 | return 0; |
1911 | } | |
1912 | ||
0849e3ba TH |
1913 | /** |
1914 | * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. | |
1915 | * | |
1916 | * @file: Pointer to "struct file". | |
1917 | * @wait: Pointer to "poll_table". | |
1918 | * | |
1919 | * Waits for read readiness. | |
1920 | * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . | |
1921 | */ | |
1922 | int tomoyo_poll_control(struct file *file, poll_table *wait) | |
1923 | { | |
1924 | struct tomoyo_io_buffer *head = file->private_data; | |
1925 | if (!head->poll) | |
1926 | return -ENOSYS; | |
1927 | return head->poll(file, wait); | |
1928 | } | |
1929 | ||
9590837b KT |
1930 | /** |
1931 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1932 | * | |
1933 | * @file: Pointer to "struct file". | |
1934 | * @buffer: Poiner to buffer to write to. | |
1935 | * @buffer_len: Size of @buffer. | |
1936 | * | |
1937 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
1938 | * |
1939 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1940 | */ |
c3ef1500 TH |
1941 | int tomoyo_read_control(struct file *file, char __user *buffer, |
1942 | const int buffer_len) | |
9590837b | 1943 | { |
f23571e8 | 1944 | int len; |
9590837b | 1945 | struct tomoyo_io_buffer *head = file->private_data; |
9590837b KT |
1946 | |
1947 | if (!head->read) | |
1948 | return -ENOSYS; | |
1949 | if (mutex_lock_interruptible(&head->io_sem)) | |
1950 | return -EINTR; | |
f23571e8 TH |
1951 | head->read_user_buf = buffer; |
1952 | head->read_user_buf_avail = buffer_len; | |
1953 | if (tomoyo_flush(head)) | |
1954 | /* Call the policy handler. */ | |
1955 | head->read(head); | |
1956 | tomoyo_flush(head); | |
1957 | len = head->read_user_buf - buffer; | |
9590837b KT |
1958 | mutex_unlock(&head->io_sem); |
1959 | return len; | |
1960 | } | |
1961 | ||
1962 | /** | |
1963 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
1964 | * | |
1965 | * @file: Pointer to "struct file". | |
1966 | * @buffer: Pointer to buffer to read from. | |
1967 | * @buffer_len: Size of @buffer. | |
1968 | * | |
1969 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
1970 | * |
1971 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1972 | */ |
c3ef1500 TH |
1973 | int tomoyo_write_control(struct file *file, const char __user *buffer, |
1974 | const int buffer_len) | |
9590837b KT |
1975 | { |
1976 | struct tomoyo_io_buffer *head = file->private_data; | |
1977 | int error = buffer_len; | |
1978 | int avail_len = buffer_len; | |
1979 | char *cp0 = head->write_buf; | |
1980 | ||
1981 | if (!head->write) | |
1982 | return -ENOSYS; | |
1983 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
1984 | return -EFAULT; | |
1985 | /* Don't allow updating policies by non manager programs. */ | |
1986 | if (head->write != tomoyo_write_pid && | |
e2bf6907 | 1987 | head->write != tomoyo_write_domain && !tomoyo_manager()) |
9590837b KT |
1988 | return -EPERM; |
1989 | if (mutex_lock_interruptible(&head->io_sem)) | |
1990 | return -EINTR; | |
1991 | /* Read a line and dispatch it to the policy handler. */ | |
1992 | while (avail_len > 0) { | |
1993 | char c; | |
1994 | if (head->write_avail >= head->writebuf_size - 1) { | |
1995 | error = -ENOMEM; | |
1996 | break; | |
1997 | } else if (get_user(c, buffer)) { | |
1998 | error = -EFAULT; | |
1999 | break; | |
2000 | } | |
2001 | buffer++; | |
2002 | avail_len--; | |
2003 | cp0[head->write_avail++] = c; | |
2004 | if (c != '\n') | |
2005 | continue; | |
2006 | cp0[head->write_avail - 1] = '\0'; | |
2007 | head->write_avail = 0; | |
2008 | tomoyo_normalize_line(cp0); | |
2009 | head->write(head); | |
2010 | } | |
2011 | mutex_unlock(&head->io_sem); | |
2012 | return error; | |
2013 | } | |
2014 | ||
2015 | /** | |
2016 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
2017 | * | |
2018 | * @file: Pointer to "struct file". | |
2019 | * | |
2020 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
2021 | * |
2022 | * Caller looses tomoyo_read_lock(). | |
9590837b | 2023 | */ |
c3ef1500 | 2024 | int tomoyo_close_control(struct file *file) |
9590837b KT |
2025 | { |
2026 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 2027 | const bool is_write = !!head->write_buf; |
9590837b | 2028 | |
17fcfbd9 TH |
2029 | /* |
2030 | * If the file is /sys/kernel/security/tomoyo/query , decrement the | |
2031 | * observer counter. | |
2032 | */ | |
2033 | if (head->type == TOMOYO_QUERY) | |
2034 | atomic_dec(&tomoyo_query_observers); | |
2035 | else | |
2036 | tomoyo_read_unlock(head->reader_idx); | |
9590837b | 2037 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 2038 | kfree(head->read_buf); |
9590837b | 2039 | head->read_buf = NULL; |
8e2d39a1 | 2040 | kfree(head->write_buf); |
9590837b | 2041 | head->write_buf = NULL; |
8e2d39a1 | 2042 | kfree(head); |
9590837b KT |
2043 | head = NULL; |
2044 | file->private_data = NULL; | |
847b173e TH |
2045 | if (is_write) |
2046 | tomoyo_run_gc(); | |
9590837b KT |
2047 | return 0; |
2048 | } | |
2049 | ||
9590837b | 2050 | /** |
c3ef1500 | 2051 | * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
9590837b | 2052 | */ |
c3ef1500 | 2053 | void tomoyo_check_profile(void) |
9590837b | 2054 | { |
c3ef1500 TH |
2055 | struct tomoyo_domain_info *domain; |
2056 | const int idx = tomoyo_read_lock(); | |
2057 | tomoyo_policy_loaded = true; | |
2058 | /* Check all profiles currently assigned to domains are defined. */ | |
2059 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
2060 | const u8 profile = domain->profile; | |
2061 | if (tomoyo_profile_ptr[profile]) | |
2062 | continue; | |
9f1c1d42 TH |
2063 | printk(KERN_ERR "You need to define profile %u before using it.\n", |
2064 | profile); | |
2065 | printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ " | |
2066 | "for more information.\n"); | |
c3ef1500 TH |
2067 | panic("Profile %u (used by '%s') not defined.\n", |
2068 | profile, domain->domainname->name); | |
2069 | } | |
2070 | tomoyo_read_unlock(idx); | |
9f1c1d42 TH |
2071 | if (tomoyo_profile_version != 20090903) { |
2072 | printk(KERN_ERR "You need to install userland programs for " | |
2073 | "TOMOYO 2.3 and initialize policy configuration.\n"); | |
2074 | printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ " | |
2075 | "for more information.\n"); | |
57c2590f TH |
2076 | panic("Profile version %u is not supported.\n", |
2077 | tomoyo_profile_version); | |
9f1c1d42 | 2078 | } |
e6f6a4cc | 2079 | printk(KERN_INFO "TOMOYO: 2.3.0\n"); |
c3ef1500 | 2080 | printk(KERN_INFO "Mandatory Access Control activated.\n"); |
9590837b | 2081 | } |