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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 | 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 KT |
30 | /* String table for functionality that takes 4 modes. */ |
31 | static const char *tomoyo_mode_4[4] = { | |
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 | ||
7762fbff TH |
79 | /** |
80 | * tomoyo_print_name_union - Print a tomoyo_name_union. | |
81 | * | |
82 | * @head: Pointer to "struct tomoyo_io_buffer". | |
83 | * @ptr: Pointer to "struct tomoyo_name_union". | |
84 | * | |
85 | * Returns true on success, false otherwise. | |
86 | */ | |
87 | static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head, | |
88 | const struct tomoyo_name_union *ptr) | |
89 | { | |
90 | int pos = head->read_avail; | |
91 | if (pos && head->read_buf[pos - 1] == ' ') | |
92 | head->read_avail--; | |
93 | if (ptr->is_group) | |
94 | return tomoyo_io_printf(head, " @%s", | |
95 | ptr->group->group_name->name); | |
96 | return tomoyo_io_printf(head, " %s", ptr->filename->name); | |
97 | } | |
98 | ||
4c3e9e2d TH |
99 | /** |
100 | * tomoyo_print_number_union - Print a tomoyo_number_union. | |
101 | * | |
102 | * @head: Pointer to "struct tomoyo_io_buffer". | |
103 | * @ptr: Pointer to "struct tomoyo_number_union". | |
104 | * | |
105 | * Returns true on success, false otherwise. | |
106 | */ | |
107 | bool tomoyo_print_number_union(struct tomoyo_io_buffer *head, | |
108 | const struct tomoyo_number_union *ptr) | |
109 | { | |
110 | unsigned long min; | |
111 | unsigned long max; | |
112 | u8 min_type; | |
113 | u8 max_type; | |
114 | if (!tomoyo_io_printf(head, " ")) | |
115 | return false; | |
116 | if (ptr->is_group) | |
117 | return tomoyo_io_printf(head, "@%s", | |
118 | ptr->group->group_name->name); | |
119 | min_type = ptr->min_type; | |
120 | max_type = ptr->max_type; | |
121 | min = ptr->values[0]; | |
122 | max = ptr->values[1]; | |
123 | switch (min_type) { | |
124 | case TOMOYO_VALUE_TYPE_HEXADECIMAL: | |
125 | if (!tomoyo_io_printf(head, "0x%lX", min)) | |
126 | return false; | |
127 | break; | |
128 | case TOMOYO_VALUE_TYPE_OCTAL: | |
129 | if (!tomoyo_io_printf(head, "0%lo", min)) | |
130 | return false; | |
131 | break; | |
132 | default: | |
133 | if (!tomoyo_io_printf(head, "%lu", min)) | |
134 | return false; | |
135 | break; | |
136 | } | |
137 | if (min == max && min_type == max_type) | |
138 | return true; | |
139 | switch (max_type) { | |
140 | case TOMOYO_VALUE_TYPE_HEXADECIMAL: | |
141 | return tomoyo_io_printf(head, "-0x%lX", max); | |
142 | case TOMOYO_VALUE_TYPE_OCTAL: | |
143 | return tomoyo_io_printf(head, "-0%lo", max); | |
144 | default: | |
145 | return tomoyo_io_printf(head, "-%lu", max); | |
146 | } | |
147 | } | |
148 | ||
9590837b KT |
149 | /** |
150 | * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure. | |
151 | * | |
152 | * @head: Pointer to "struct tomoyo_io_buffer". | |
153 | * @fmt: The printf()'s format string, followed by parameters. | |
154 | * | |
155 | * Returns true if output was written, false otherwise. | |
156 | * | |
157 | * The snprintf() will truncate, but tomoyo_io_printf() won't. | |
158 | */ | |
159 | bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) | |
160 | { | |
161 | va_list args; | |
162 | int len; | |
163 | int pos = head->read_avail; | |
164 | int size = head->readbuf_size - pos; | |
165 | ||
166 | if (size <= 0) | |
167 | return false; | |
168 | va_start(args, fmt); | |
169 | len = vsnprintf(head->read_buf + pos, size, fmt, args); | |
170 | va_end(args); | |
171 | if (pos + len >= head->readbuf_size) | |
172 | return false; | |
173 | head->read_avail += len; | |
174 | return true; | |
175 | } | |
176 | ||
9590837b KT |
177 | /** |
178 | * tomoyo_find_or_assign_new_profile - Create a new profile. | |
179 | * | |
180 | * @profile: Profile number to create. | |
181 | * | |
182 | * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise. | |
183 | */ | |
57c2590f TH |
184 | static struct tomoyo_profile *tomoyo_find_or_assign_new_profile |
185 | (const unsigned int profile) | |
9590837b | 186 | { |
57c2590f TH |
187 | struct tomoyo_profile *ptr; |
188 | struct tomoyo_profile *entry; | |
9590837b KT |
189 | if (profile >= TOMOYO_MAX_PROFILES) |
190 | return NULL; | |
9590837b KT |
191 | ptr = tomoyo_profile_ptr[profile]; |
192 | if (ptr) | |
57c2590f TH |
193 | return ptr; |
194 | entry = kzalloc(sizeof(*entry), GFP_NOFS); | |
195 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
196 | goto out; | |
197 | ptr = tomoyo_profile_ptr[profile]; | |
198 | if (!ptr && tomoyo_memory_ok(entry)) { | |
199 | ptr = entry; | |
200 | ptr->learning = &tomoyo_default_profile.preference; | |
201 | ptr->permissive = &tomoyo_default_profile.preference; | |
202 | ptr->enforcing = &tomoyo_default_profile.preference; | |
203 | ptr->default_config = TOMOYO_CONFIG_DISABLED; | |
204 | memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT, | |
205 | sizeof(ptr->config)); | |
206 | mb(); /* Avoid out-of-order execution. */ | |
207 | tomoyo_profile_ptr[profile] = ptr; | |
208 | entry = NULL; | |
cd7bec6a | 209 | } |
29282381 | 210 | mutex_unlock(&tomoyo_policy_lock); |
57c2590f TH |
211 | out: |
212 | kfree(entry); | |
9590837b KT |
213 | return ptr; |
214 | } | |
215 | ||
216 | /** | |
57c2590f TH |
217 | * tomoyo_profile - Find a profile. |
218 | * | |
219 | * @profile: Profile number to find. | |
220 | * | |
221 | * Returns pointer to "struct tomoyo_profile". | |
222 | */ | |
223 | struct tomoyo_profile *tomoyo_profile(const u8 profile) | |
224 | { | |
225 | struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile]; | |
226 | if (!tomoyo_policy_loaded) | |
227 | return &tomoyo_default_profile; | |
228 | BUG_ON(!ptr); | |
229 | return ptr; | |
230 | } | |
231 | ||
232 | /** | |
233 | * tomoyo_write_profile - Write profile table. | |
9590837b KT |
234 | * |
235 | * @head: Pointer to "struct tomoyo_io_buffer". | |
236 | * | |
237 | * Returns 0 on success, negative value otherwise. | |
238 | */ | |
239 | static int tomoyo_write_profile(struct tomoyo_io_buffer *head) | |
240 | { | |
241 | char *data = head->write_buf; | |
242 | unsigned int i; | |
57c2590f TH |
243 | int value; |
244 | int mode; | |
245 | u8 config; | |
246 | bool use_default = false; | |
9590837b KT |
247 | char *cp; |
248 | struct tomoyo_profile *profile; | |
57c2590f TH |
249 | if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1) |
250 | return 0; | |
251 | i = simple_strtoul(data, &cp, 10); | |
252 | if (data == cp) { | |
253 | profile = &tomoyo_default_profile; | |
254 | } else { | |
255 | if (*cp != '-') | |
256 | return -EINVAL; | |
9590837b | 257 | data = cp + 1; |
57c2590f TH |
258 | profile = tomoyo_find_or_assign_new_profile(i); |
259 | if (!profile) | |
260 | return -EINVAL; | |
261 | } | |
9590837b KT |
262 | cp = strchr(data, '='); |
263 | if (!cp) | |
264 | return -EINVAL; | |
57c2590f TH |
265 | *cp++ = '\0'; |
266 | if (profile != &tomoyo_default_profile) | |
267 | use_default = strstr(cp, "use_default") != NULL; | |
268 | if (strstr(cp, "verbose=yes")) | |
269 | value = 1; | |
270 | else if (strstr(cp, "verbose=no")) | |
271 | value = 0; | |
272 | else | |
273 | value = -1; | |
274 | if (!strcmp(data, "PREFERENCE::enforcing")) { | |
275 | if (use_default) { | |
276 | profile->enforcing = &tomoyo_default_profile.preference; | |
277 | return 0; | |
278 | } | |
279 | profile->enforcing = &profile->preference; | |
280 | if (value >= 0) | |
281 | profile->preference.enforcing_verbose = value; | |
282 | return 0; | |
283 | } | |
284 | if (!strcmp(data, "PREFERENCE::permissive")) { | |
285 | if (use_default) { | |
286 | profile->permissive = &tomoyo_default_profile.preference; | |
287 | return 0; | |
288 | } | |
289 | profile->permissive = &profile->preference; | |
290 | if (value >= 0) | |
291 | profile->preference.permissive_verbose = value; | |
292 | return 0; | |
293 | } | |
294 | if (!strcmp(data, "PREFERENCE::learning")) { | |
295 | char *cp2; | |
296 | if (use_default) { | |
297 | profile->learning = &tomoyo_default_profile.preference; | |
298 | return 0; | |
299 | } | |
300 | profile->learning = &profile->preference; | |
301 | if (value >= 0) | |
302 | profile->preference.learning_verbose = value; | |
303 | cp2 = strstr(cp, "max_entry="); | |
304 | if (cp2) | |
305 | sscanf(cp2 + 10, "%u", | |
306 | &profile->preference.learning_max_entry); | |
307 | return 0; | |
308 | } | |
309 | if (profile == &tomoyo_default_profile) | |
310 | return -EINVAL; | |
9590837b | 311 | if (!strcmp(data, "COMMENT")) { |
bf24fb01 | 312 | const struct tomoyo_path_info *old_comment = profile->comment; |
57c2590f | 313 | profile->comment = tomoyo_get_name(cp); |
bf24fb01 | 314 | tomoyo_put_name(old_comment); |
9590837b KT |
315 | return 0; |
316 | } | |
57c2590f TH |
317 | if (!strcmp(data, "CONFIG")) { |
318 | i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; | |
319 | config = profile->default_config; | |
320 | } else if (tomoyo_str_starts(&data, "CONFIG::")) { | |
321 | config = 0; | |
322 | for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { | |
323 | if (strcmp(data, tomoyo_mac_keywords[i])) | |
324 | continue; | |
325 | config = profile->config[i]; | |
326 | break; | |
9590837b | 327 | } |
57c2590f TH |
328 | if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) |
329 | return -EINVAL; | |
330 | } else { | |
331 | return -EINVAL; | |
9590837b | 332 | } |
57c2590f TH |
333 | if (use_default) { |
334 | config = TOMOYO_CONFIG_USE_DEFAULT; | |
335 | } else { | |
336 | for (mode = 3; mode >= 0; mode--) | |
337 | if (strstr(cp, tomoyo_mode_4[mode])) | |
338 | /* | |
339 | * Update lower 3 bits in order to distinguish | |
340 | * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'. | |
341 | */ | |
342 | config = (config & ~7) | mode; | |
343 | } | |
344 | if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX) | |
345 | profile->config[i] = config; | |
346 | else if (config != TOMOYO_CONFIG_USE_DEFAULT) | |
347 | profile->default_config = config; | |
348 | return 0; | |
9590837b KT |
349 | } |
350 | ||
351 | /** | |
57c2590f | 352 | * tomoyo_read_profile - Read profile table. |
9590837b KT |
353 | * |
354 | * @head: Pointer to "struct tomoyo_io_buffer". | |
9590837b | 355 | */ |
8fbe71f0 | 356 | static void tomoyo_read_profile(struct tomoyo_io_buffer *head) |
9590837b | 357 | { |
57c2590f | 358 | int index; |
9590837b | 359 | if (head->read_eof) |
8fbe71f0 | 360 | return; |
57c2590f TH |
361 | if (head->read_bit) |
362 | goto body; | |
363 | tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); | |
364 | tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s " | |
365 | "max_entry=%u }\n", | |
366 | tomoyo_yesno(tomoyo_default_profile.preference. | |
367 | learning_verbose), | |
368 | tomoyo_default_profile.preference.learning_max_entry); | |
369 | tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n", | |
370 | tomoyo_yesno(tomoyo_default_profile.preference. | |
371 | permissive_verbose)); | |
372 | tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n", | |
373 | tomoyo_yesno(tomoyo_default_profile.preference. | |
374 | enforcing_verbose)); | |
375 | head->read_bit = 1; | |
376 | body: | |
377 | for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) { | |
378 | bool done; | |
379 | u8 config; | |
380 | int i; | |
381 | int pos; | |
9590837b KT |
382 | const struct tomoyo_profile *profile |
383 | = tomoyo_profile_ptr[index]; | |
57c2590f TH |
384 | const struct tomoyo_path_info *comment; |
385 | head->read_step = index; | |
9590837b KT |
386 | if (!profile) |
387 | continue; | |
57c2590f TH |
388 | pos = head->read_avail; |
389 | comment = profile->comment; | |
390 | done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index, | |
391 | comment ? comment->name : ""); | |
392 | if (!done) | |
393 | goto out; | |
394 | config = profile->default_config; | |
395 | if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index, | |
396 | tomoyo_mode_4[config & 3])) | |
397 | goto out; | |
398 | for (i = 0; i < TOMOYO_MAX_MAC_INDEX + | |
399 | TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { | |
400 | config = profile->config[i]; | |
401 | if (config == TOMOYO_CONFIG_USE_DEFAULT) | |
402 | continue; | |
403 | if (!tomoyo_io_printf(head, | |
404 | "%u-CONFIG::%s={ mode=%s }\n", | |
405 | index, tomoyo_mac_keywords[i], | |
406 | tomoyo_mode_4[config & 3])) | |
407 | goto out; | |
9590837b | 408 | } |
57c2590f TH |
409 | if (profile->learning != &tomoyo_default_profile.preference && |
410 | !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ " | |
411 | "verbose=%s max_entry=%u }\n", index, | |
412 | tomoyo_yesno(profile->preference. | |
413 | learning_verbose), | |
414 | profile->preference.learning_max_entry)) | |
415 | goto out; | |
416 | if (profile->permissive != &tomoyo_default_profile.preference | |
417 | && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ " | |
418 | "verbose=%s }\n", index, | |
419 | tomoyo_yesno(profile->preference. | |
420 | permissive_verbose))) | |
421 | goto out; | |
422 | if (profile->enforcing != &tomoyo_default_profile.preference && | |
423 | !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ " | |
424 | "verbose=%s }\n", index, | |
425 | tomoyo_yesno(profile->preference. | |
426 | enforcing_verbose))) | |
427 | goto out; | |
428 | continue; | |
429 | out: | |
430 | head->read_avail = pos; | |
431 | break; | |
9590837b | 432 | } |
57c2590f | 433 | if (index == TOMOYO_MAX_PROFILES) |
9590837b | 434 | head->read_eof = true; |
9590837b KT |
435 | } |
436 | ||
36f5e1ff TH |
437 | static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a, |
438 | const struct tomoyo_acl_head *b) | |
439 | { | |
440 | return container_of(a, struct tomoyo_policy_manager_entry, head) | |
441 | ->manager == | |
442 | container_of(b, struct tomoyo_policy_manager_entry, head) | |
443 | ->manager; | |
444 | } | |
445 | ||
9590837b KT |
446 | /** |
447 | * tomoyo_update_manager_entry - Add a manager entry. | |
448 | * | |
449 | * @manager: The path to manager or the domainnamme. | |
450 | * @is_delete: True if it is a delete request. | |
451 | * | |
452 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
453 | * |
454 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
455 | */ |
456 | static int tomoyo_update_manager_entry(const char *manager, | |
457 | const bool is_delete) | |
458 | { | |
9e4b50e9 | 459 | struct tomoyo_policy_manager_entry e = { }; |
36f5e1ff | 460 | int error; |
9590837b | 461 | |
75093152 TH |
462 | if (tomoyo_domain_def(manager)) { |
463 | if (!tomoyo_correct_domain(manager)) | |
9590837b | 464 | return -EINVAL; |
9e4b50e9 | 465 | e.is_domain = true; |
9590837b | 466 | } else { |
75093152 | 467 | if (!tomoyo_correct_path(manager)) |
9590837b KT |
468 | return -EINVAL; |
469 | } | |
9e4b50e9 TH |
470 | e.manager = tomoyo_get_name(manager); |
471 | if (!e.manager) | |
9590837b | 472 | return -ENOMEM; |
36f5e1ff | 473 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
a230f9e7 | 474 | &tomoyo_policy_list[TOMOYO_ID_MANAGER], |
36f5e1ff | 475 | tomoyo_same_manager_entry); |
9e4b50e9 | 476 | tomoyo_put_name(e.manager); |
9590837b KT |
477 | return error; |
478 | } | |
479 | ||
480 | /** | |
481 | * tomoyo_write_manager_policy - Write manager policy. | |
482 | * | |
483 | * @head: Pointer to "struct tomoyo_io_buffer". | |
484 | * | |
485 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
486 | * |
487 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
488 | */ |
489 | static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) | |
490 | { | |
491 | char *data = head->write_buf; | |
492 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
493 | ||
494 | if (!strcmp(data, "manage_by_non_root")) { | |
495 | tomoyo_manage_by_non_root = !is_delete; | |
496 | return 0; | |
497 | } | |
498 | return tomoyo_update_manager_entry(data, is_delete); | |
499 | } | |
500 | ||
501 | /** | |
502 | * tomoyo_read_manager_policy - Read manager policy. | |
503 | * | |
504 | * @head: Pointer to "struct tomoyo_io_buffer". | |
505 | * | |
fdb8ebb7 | 506 | * Caller holds tomoyo_read_lock(). |
9590837b | 507 | */ |
8fbe71f0 | 508 | static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) |
9590837b | 509 | { |
9590837b KT |
510 | bool done = true; |
511 | ||
512 | if (head->read_eof) | |
8fbe71f0 | 513 | return; |
475e6fa3 | 514 | list_for_each_cookie(head->read_var2, |
a230f9e7 | 515 | &tomoyo_policy_list[TOMOYO_ID_MANAGER]) { |
475e6fa3 TH |
516 | struct tomoyo_policy_manager_entry *ptr = |
517 | list_entry(head->read_var2, typeof(*ptr), head.list); | |
82e0f001 | 518 | if (ptr->head.is_deleted) |
9590837b | 519 | continue; |
7d2948b1 TH |
520 | done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); |
521 | if (!done) | |
9590837b | 522 | break; |
9590837b | 523 | } |
9590837b | 524 | head->read_eof = done; |
9590837b KT |
525 | } |
526 | ||
527 | /** | |
75093152 | 528 | * tomoyo_policy_manager - Check whether the current process is a policy manager. |
9590837b KT |
529 | * |
530 | * Returns true if the current process is permitted to modify policy | |
531 | * via /sys/kernel/security/tomoyo/ interface. | |
fdb8ebb7 TH |
532 | * |
533 | * Caller holds tomoyo_read_lock(). | |
9590837b | 534 | */ |
75093152 | 535 | static bool tomoyo_policy_manager(void) |
9590837b KT |
536 | { |
537 | struct tomoyo_policy_manager_entry *ptr; | |
538 | const char *exe; | |
539 | const struct task_struct *task = current; | |
540 | const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; | |
541 | bool found = false; | |
542 | ||
543 | if (!tomoyo_policy_loaded) | |
544 | return true; | |
545 | if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) | |
546 | return false; | |
a230f9e7 TH |
547 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], |
548 | head.list) { | |
82e0f001 | 549 | if (!ptr->head.is_deleted && ptr->is_domain |
9590837b KT |
550 | && !tomoyo_pathcmp(domainname, ptr->manager)) { |
551 | found = true; | |
552 | break; | |
553 | } | |
554 | } | |
9590837b KT |
555 | if (found) |
556 | return true; | |
557 | exe = tomoyo_get_exe(); | |
558 | if (!exe) | |
559 | return false; | |
a230f9e7 TH |
560 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER], |
561 | head.list) { | |
82e0f001 | 562 | if (!ptr->head.is_deleted && !ptr->is_domain |
9590837b KT |
563 | && !strcmp(exe, ptr->manager->name)) { |
564 | found = true; | |
565 | break; | |
566 | } | |
567 | } | |
9590837b KT |
568 | if (!found) { /* Reduce error messages. */ |
569 | static pid_t last_pid; | |
570 | const pid_t pid = current->pid; | |
571 | if (last_pid != pid) { | |
572 | printk(KERN_WARNING "%s ( %s ) is not permitted to " | |
573 | "update policies.\n", domainname->name, exe); | |
574 | last_pid = pid; | |
575 | } | |
576 | } | |
8e2d39a1 | 577 | kfree(exe); |
9590837b KT |
578 | return found; |
579 | } | |
580 | ||
581 | /** | |
75093152 | 582 | * tomoyo_select_one - Parse select command. |
9590837b KT |
583 | * |
584 | * @head: Pointer to "struct tomoyo_io_buffer". | |
585 | * @data: String to parse. | |
586 | * | |
587 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
588 | * |
589 | * Caller holds tomoyo_read_lock(). | |
9590837b | 590 | */ |
475e6fa3 | 591 | static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data) |
9590837b KT |
592 | { |
593 | unsigned int pid; | |
594 | struct tomoyo_domain_info *domain = NULL; | |
9b244373 | 595 | bool global_pid = false; |
9590837b | 596 | |
063821c8 TH |
597 | if (!strcmp(data, "allow_execute")) { |
598 | head->print_execute_only = true; | |
599 | return true; | |
600 | } | |
9b244373 TH |
601 | if (sscanf(data, "pid=%u", &pid) == 1 || |
602 | (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { | |
9590837b | 603 | struct task_struct *p; |
1fcdc7c5 | 604 | rcu_read_lock(); |
9590837b | 605 | read_lock(&tasklist_lock); |
9b244373 TH |
606 | if (global_pid) |
607 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
608 | else | |
609 | p = find_task_by_vpid(pid); | |
9590837b KT |
610 | if (p) |
611 | domain = tomoyo_real_domain(p); | |
612 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 613 | rcu_read_unlock(); |
9590837b | 614 | } else if (!strncmp(data, "domain=", 7)) { |
75093152 | 615 | if (tomoyo_domain_def(data + 7)) |
9590837b | 616 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
617 | } else |
618 | return false; | |
619 | head->write_var1 = domain; | |
620 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
621 | if (!head->read_buf) | |
622 | return true; /* Do nothing if open(O_WRONLY). */ | |
623 | head->read_avail = 0; | |
624 | tomoyo_io_printf(head, "# select %s\n", data); | |
625 | head->read_single_domain = true; | |
626 | head->read_eof = !domain; | |
475e6fa3 TH |
627 | head->read_var1 = &domain->list; |
628 | head->read_var2 = NULL; | |
629 | head->read_bit = 0; | |
630 | head->read_step = 0; | |
631 | if (domain && domain->is_deleted) | |
632 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
9590837b KT |
633 | return true; |
634 | } | |
635 | ||
ccf135f5 TH |
636 | /** |
637 | * tomoyo_delete_domain - Delete a domain. | |
638 | * | |
639 | * @domainname: The name of domain. | |
640 | * | |
641 | * Returns 0. | |
fdb8ebb7 TH |
642 | * |
643 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
644 | */ |
645 | static int tomoyo_delete_domain(char *domainname) | |
646 | { | |
647 | struct tomoyo_domain_info *domain; | |
648 | struct tomoyo_path_info name; | |
649 | ||
650 | name.name = domainname; | |
651 | tomoyo_fill_path_info(&name); | |
29282381 TH |
652 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
653 | return 0; | |
ccf135f5 | 654 | /* Is there an active domain? */ |
fdb8ebb7 | 655 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
656 | /* Never delete tomoyo_kernel_domain */ |
657 | if (domain == &tomoyo_kernel_domain) | |
658 | continue; | |
659 | if (domain->is_deleted || | |
660 | tomoyo_pathcmp(domain->domainname, &name)) | |
661 | continue; | |
662 | domain->is_deleted = true; | |
663 | break; | |
664 | } | |
f737d95d | 665 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
666 | return 0; |
667 | } | |
668 | ||
17fcfbd9 TH |
669 | /** |
670 | * tomoyo_write_domain_policy2 - Write domain policy. | |
671 | * | |
672 | * @head: Pointer to "struct tomoyo_io_buffer". | |
673 | * | |
674 | * Returns 0 on success, negative value otherwise. | |
675 | * | |
676 | * Caller holds tomoyo_read_lock(). | |
677 | */ | |
678 | static int tomoyo_write_domain_policy2(char *data, | |
679 | struct tomoyo_domain_info *domain, | |
680 | const bool is_delete) | |
681 | { | |
682 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) | |
683 | return tomoyo_write_mount_policy(data, domain, is_delete); | |
684 | return tomoyo_write_file_policy(data, domain, is_delete); | |
685 | } | |
686 | ||
9590837b KT |
687 | /** |
688 | * tomoyo_write_domain_policy - Write domain policy. | |
689 | * | |
690 | * @head: Pointer to "struct tomoyo_io_buffer". | |
691 | * | |
692 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
693 | * |
694 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
695 | */ |
696 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
697 | { | |
698 | char *data = head->write_buf; | |
699 | struct tomoyo_domain_info *domain = head->write_var1; | |
700 | bool is_delete = false; | |
701 | bool is_select = false; | |
9590837b KT |
702 | unsigned int profile; |
703 | ||
704 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
705 | is_delete = true; | |
706 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
707 | is_select = true; | |
75093152 | 708 | if (is_select && tomoyo_select_one(head, data)) |
9590837b KT |
709 | return 0; |
710 | /* Don't allow updating policies by non manager programs. */ | |
75093152 | 711 | if (!tomoyo_policy_manager()) |
9590837b | 712 | return -EPERM; |
75093152 | 713 | if (tomoyo_domain_def(data)) { |
9590837b KT |
714 | domain = NULL; |
715 | if (is_delete) | |
716 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 717 | else if (is_select) |
9590837b | 718 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 719 | else |
9590837b KT |
720 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
721 | head->write_var1 = domain; | |
722 | return 0; | |
723 | } | |
724 | if (!domain) | |
725 | return -EINVAL; | |
726 | ||
727 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
728 | && profile < TOMOYO_MAX_PROFILES) { | |
729 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
730 | domain->profile = (u8) profile; | |
731 | return 0; | |
732 | } | |
733 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 734 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
735 | return 0; |
736 | } | |
9b244373 TH |
737 | if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { |
738 | domain->quota_warned = !is_delete; | |
739 | return 0; | |
740 | } | |
741 | if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { | |
742 | domain->transition_failed = !is_delete; | |
743 | return 0; | |
744 | } | |
17fcfbd9 | 745 | return tomoyo_write_domain_policy2(data, domain, is_delete); |
9590837b KT |
746 | } |
747 | ||
748 | /** | |
5db5a39b | 749 | * tomoyo_fns - Find next set bit. |
9590837b | 750 | * |
5db5a39b TH |
751 | * @perm: 8 bits value. |
752 | * @bit: First bit to find. | |
9590837b | 753 | * |
5db5a39b | 754 | * Returns next on-bit on success, 8 otherwise. |
9590837b | 755 | */ |
5db5a39b | 756 | static u8 tomoyo_fns(const u8 perm, u8 bit) |
9590837b | 757 | { |
5db5a39b TH |
758 | for ( ; bit < 8; bit++) |
759 | if (perm & (1 << bit)) | |
760 | break; | |
761 | return bit; | |
9590837b KT |
762 | } |
763 | ||
764 | /** | |
5db5a39b | 765 | * tomoyo_print_entry - Print an ACL entry. |
9590837b KT |
766 | * |
767 | * @head: Pointer to "struct tomoyo_io_buffer". | |
5db5a39b | 768 | * @acl: Pointer to an ACL entry. |
9590837b KT |
769 | * |
770 | * Returns true on success, false otherwise. | |
771 | */ | |
5db5a39b TH |
772 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, |
773 | struct tomoyo_acl_info *acl) | |
9590837b | 774 | { |
5db5a39b TH |
775 | const u8 acl_type = acl->type; |
776 | u8 bit = head->read_bit; | |
777 | int pos = head->read_avail; | |
9590837b | 778 | |
5db5a39b TH |
779 | if (acl->is_deleted) |
780 | return true; | |
781 | next: | |
782 | if (acl_type == TOMOYO_TYPE_PATH_ACL) { | |
783 | struct tomoyo_path_acl *ptr = | |
784 | container_of(acl, typeof(*ptr), head); | |
785 | const u16 perm = ptr->perm; | |
786 | for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { | |
787 | if (!(perm & (1 << bit))) | |
788 | continue; | |
789 | if (head->print_execute_only && | |
790 | bit != TOMOYO_TYPE_EXECUTE) | |
791 | continue; | |
792 | /* Print "read/write" instead of "read" and "write". */ | |
793 | if ((bit == TOMOYO_TYPE_READ || | |
794 | bit == TOMOYO_TYPE_WRITE) | |
795 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
796 | continue; | |
797 | break; | |
798 | } | |
799 | if (bit >= TOMOYO_MAX_PATH_OPERATION) | |
800 | goto done; | |
801 | if (!tomoyo_io_printf(head, "allow_%s ", | |
802 | tomoyo_path_keyword[bit]) || | |
803 | !tomoyo_print_name_union(head, &ptr->name)) | |
804 | goto out; | |
805 | } else if (head->print_execute_only) { | |
806 | return true; | |
807 | } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) { | |
808 | struct tomoyo_path2_acl *ptr = | |
809 | container_of(acl, typeof(*ptr), head); | |
810 | bit = tomoyo_fns(ptr->perm, bit); | |
811 | if (bit >= TOMOYO_MAX_PATH2_OPERATION) | |
812 | goto done; | |
7762fbff | 813 | if (!tomoyo_io_printf(head, "allow_%s ", |
71c28236 | 814 | tomoyo_path2_keyword[bit]) || |
7762fbff | 815 | !tomoyo_print_name_union(head, &ptr->name1) || |
5db5a39b | 816 | !tomoyo_print_name_union(head, &ptr->name2)) |
9590837b | 817 | goto out; |
5db5a39b TH |
818 | } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
819 | struct tomoyo_path_number_acl *ptr = | |
820 | container_of(acl, typeof(*ptr), head); | |
821 | bit = tomoyo_fns(ptr->perm, bit); | |
822 | if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION) | |
823 | goto done; | |
a1f9bb6a | 824 | if (!tomoyo_io_printf(head, "allow_%s", |
71c28236 | 825 | tomoyo_path_number_keyword[bit]) || |
a1f9bb6a | 826 | !tomoyo_print_name_union(head, &ptr->name) || |
5db5a39b | 827 | !tomoyo_print_number_union(head, &ptr->number)) |
a1f9bb6a | 828 | goto out; |
5db5a39b TH |
829 | } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { |
830 | struct tomoyo_mkdev_acl *ptr = | |
831 | container_of(acl, typeof(*ptr), head); | |
832 | bit = tomoyo_fns(ptr->perm, bit); | |
833 | if (bit >= TOMOYO_MAX_MKDEV_OPERATION) | |
834 | goto done; | |
a1f9bb6a | 835 | if (!tomoyo_io_printf(head, "allow_%s", |
71c28236 | 836 | tomoyo_mkdev_keyword[bit]) || |
a1f9bb6a TH |
837 | !tomoyo_print_name_union(head, &ptr->name) || |
838 | !tomoyo_print_number_union(head, &ptr->mode) || | |
839 | !tomoyo_print_number_union(head, &ptr->major) || | |
5db5a39b TH |
840 | !tomoyo_print_number_union(head, &ptr->minor)) |
841 | goto out; | |
842 | } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { | |
843 | struct tomoyo_mount_acl *ptr = | |
844 | container_of(acl, typeof(*ptr), head); | |
845 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || | |
846 | !tomoyo_print_name_union(head, &ptr->dev_name) || | |
847 | !tomoyo_print_name_union(head, &ptr->dir_name) || | |
848 | !tomoyo_print_name_union(head, &ptr->fs_type) || | |
849 | !tomoyo_print_number_union(head, &ptr->flags)) | |
a1f9bb6a TH |
850 | goto out; |
851 | } | |
5db5a39b TH |
852 | if (!tomoyo_io_printf(head, "\n")) |
853 | goto out; | |
854 | head->read_bit = bit; | |
855 | if (acl_type != TOMOYO_TYPE_MOUNT_ACL) { | |
856 | bit++; | |
857 | goto next; | |
858 | } | |
859 | done: | |
a1f9bb6a TH |
860 | head->read_bit = 0; |
861 | return true; | |
862 | out: | |
a1f9bb6a TH |
863 | head->read_avail = pos; |
864 | return false; | |
865 | } | |
866 | ||
9590837b KT |
867 | /** |
868 | * tomoyo_read_domain_policy - Read domain policy. | |
869 | * | |
870 | * @head: Pointer to "struct tomoyo_io_buffer". | |
871 | * | |
fdb8ebb7 | 872 | * Caller holds tomoyo_read_lock(). |
9590837b | 873 | */ |
8fbe71f0 | 874 | static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) |
9590837b | 875 | { |
9590837b KT |
876 | bool done = true; |
877 | ||
878 | if (head->read_eof) | |
8fbe71f0 | 879 | return; |
9590837b KT |
880 | if (head->read_step == 0) |
881 | head->read_step = 1; | |
475e6fa3 TH |
882 | list_for_each_cookie(head->read_var1, &tomoyo_domain_list) { |
883 | struct tomoyo_domain_info *domain = | |
884 | list_entry(head->read_var1, typeof(*domain), list); | |
9590837b KT |
885 | const char *quota_exceeded = ""; |
886 | const char *transition_failed = ""; | |
887 | const char *ignore_global_allow_read = ""; | |
9590837b KT |
888 | if (head->read_step != 1) |
889 | goto acl_loop; | |
890 | if (domain->is_deleted && !head->read_single_domain) | |
891 | continue; | |
892 | /* Print domainname and flags. */ | |
893 | if (domain->quota_warned) | |
894 | quota_exceeded = "quota_exceeded\n"; | |
ea13ddba | 895 | if (domain->transition_failed) |
9590837b | 896 | transition_failed = "transition_failed\n"; |
ea13ddba | 897 | if (domain->ignore_global_allow_read) |
9590837b KT |
898 | ignore_global_allow_read |
899 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
900 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
901 | "%u\n%s%s%s\n", | |
902 | domain->domainname->name, | |
903 | domain->profile, quota_exceeded, | |
904 | transition_failed, | |
905 | ignore_global_allow_read); | |
906 | if (!done) | |
9590837b | 907 | break; |
9590837b KT |
908 | head->read_step = 2; |
909 | acl_loop: | |
910 | if (head->read_step == 3) | |
911 | goto tail_mark; | |
912 | /* Print ACL entries in the domain. */ | |
475e6fa3 | 913 | list_for_each_cookie(head->read_var2, |
7d2948b1 | 914 | &domain->acl_info_list) { |
475e6fa3 TH |
915 | struct tomoyo_acl_info *ptr = |
916 | list_entry(head->read_var2, typeof(*ptr), list); | |
7d2948b1 TH |
917 | done = tomoyo_print_entry(head, ptr); |
918 | if (!done) | |
9590837b | 919 | break; |
9590837b | 920 | } |
9590837b KT |
921 | if (!done) |
922 | break; | |
475e6fa3 | 923 | head->read_var2 = NULL; |
9590837b KT |
924 | head->read_step = 3; |
925 | tail_mark: | |
7d2948b1 TH |
926 | done = tomoyo_io_printf(head, "\n"); |
927 | if (!done) | |
9590837b | 928 | break; |
9590837b KT |
929 | head->read_step = 1; |
930 | if (head->read_single_domain) | |
931 | break; | |
932 | } | |
9590837b | 933 | head->read_eof = done; |
9590837b KT |
934 | } |
935 | ||
936 | /** | |
937 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
938 | * | |
939 | * @head: Pointer to "struct tomoyo_io_buffer". | |
940 | * | |
941 | * Returns 0 on success, -EINVAL otherwise. | |
942 | * | |
943 | * This is equivalent to doing | |
944 | * | |
945 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
9b244373 | 946 | * /usr/sbin/tomoyo-loadpolicy -d |
fdb8ebb7 TH |
947 | * |
948 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
949 | */ |
950 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
951 | { | |
952 | char *data = head->write_buf; | |
953 | char *cp = strchr(data, ' '); | |
954 | struct tomoyo_domain_info *domain; | |
955 | unsigned long profile; | |
956 | ||
957 | if (!cp) | |
958 | return -EINVAL; | |
959 | *cp = '\0'; | |
9590837b | 960 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
961 | if (strict_strtoul(data, 10, &profile)) |
962 | return -EINVAL; | |
963 | if (domain && profile < TOMOYO_MAX_PROFILES | |
964 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
965 | domain->profile = (u8) profile; | |
966 | return 0; | |
967 | } | |
968 | ||
969 | /** | |
970 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
971 | * | |
972 | * @head: Pointer to "struct tomoyo_io_buffer". | |
973 | * | |
974 | * Returns list of profile number and domainname pairs. | |
975 | * | |
976 | * This is equivalent to doing | |
977 | * | |
978 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
979 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
980 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
981 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
982 | * |
983 | * Caller holds tomoyo_read_lock(). | |
9590837b | 984 | */ |
8fbe71f0 | 985 | static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) |
9590837b | 986 | { |
9590837b KT |
987 | bool done = true; |
988 | ||
989 | if (head->read_eof) | |
8fbe71f0 | 990 | return; |
475e6fa3 TH |
991 | list_for_each_cookie(head->read_var1, &tomoyo_domain_list) { |
992 | struct tomoyo_domain_info *domain = | |
993 | list_entry(head->read_var1, typeof(*domain), list); | |
9590837b KT |
994 | if (domain->is_deleted) |
995 | continue; | |
7d2948b1 TH |
996 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
997 | domain->domainname->name); | |
998 | if (!done) | |
9590837b | 999 | break; |
9590837b | 1000 | } |
9590837b | 1001 | head->read_eof = done; |
9590837b KT |
1002 | } |
1003 | ||
1004 | /** | |
1005 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1006 | * | |
1007 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1008 | * | |
1009 | * Returns 0. | |
1010 | */ | |
1011 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1012 | { | |
1013 | unsigned long pid; | |
1014 | /* No error check. */ | |
1015 | strict_strtoul(head->write_buf, 10, &pid); | |
1016 | head->read_step = (int) pid; | |
1017 | head->read_eof = false; | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | /** | |
1022 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1023 | * | |
1024 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1025 | * | |
1026 | * Returns the domainname which the specified PID is in on success, | |
1027 | * empty string otherwise. | |
1028 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1029 | * using read()/write() interface rather than sysctl() interface. | |
1030 | */ | |
8fbe71f0 | 1031 | static void tomoyo_read_pid(struct tomoyo_io_buffer *head) |
9590837b KT |
1032 | { |
1033 | if (head->read_avail == 0 && !head->read_eof) { | |
1034 | const int pid = head->read_step; | |
1035 | struct task_struct *p; | |
1036 | struct tomoyo_domain_info *domain = NULL; | |
1fcdc7c5 | 1037 | rcu_read_lock(); |
9590837b KT |
1038 | read_lock(&tasklist_lock); |
1039 | p = find_task_by_vpid(pid); | |
1040 | if (p) | |
1041 | domain = tomoyo_real_domain(p); | |
1042 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1043 | rcu_read_unlock(); |
9590837b KT |
1044 | if (domain) |
1045 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1046 | domain->domainname->name); | |
1047 | head->read_eof = true; | |
1048 | } | |
9590837b KT |
1049 | } |
1050 | ||
5448ec4f TH |
1051 | static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = { |
1052 | [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] | |
1053 | = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN, | |
1054 | [TOMOYO_TRANSITION_CONTROL_INITIALIZE] | |
1055 | = TOMOYO_KEYWORD_INITIALIZE_DOMAIN, | |
1056 | [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN, | |
1057 | [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN | |
1058 | }; | |
1059 | ||
9590837b KT |
1060 | /** |
1061 | * tomoyo_write_exception_policy - Write exception policy. | |
1062 | * | |
1063 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1064 | * | |
1065 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1066 | * |
1067 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1068 | */ |
1069 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1070 | { | |
1071 | char *data = head->write_buf; | |
1072 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
5448ec4f | 1073 | u8 i; |
9590837b | 1074 | |
5448ec4f TH |
1075 | for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) { |
1076 | if (tomoyo_str_starts(&data, tomoyo_transition_type[i])) | |
1077 | return tomoyo_write_transition_control(data, is_delete, | |
1078 | i); | |
1079 | } | |
1084307c TH |
1080 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) |
1081 | return tomoyo_write_aggregator_policy(data, is_delete); | |
9590837b KT |
1082 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) |
1083 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1084 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1085 | return tomoyo_write_pattern_policy(data, is_delete); | |
1086 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1087 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
7762fbff | 1088 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) |
7c2ea22e | 1089 | return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP); |
4c3e9e2d | 1090 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) |
7c2ea22e | 1091 | return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP); |
9590837b KT |
1092 | return -EINVAL; |
1093 | } | |
1094 | ||
31845e8c TH |
1095 | static void tomoyo_print_number(char *buffer, int buffer_len, |
1096 | const struct tomoyo_number_union *ptr) | |
1097 | { | |
1098 | int i; | |
1099 | unsigned long min = ptr->values[0]; | |
1100 | const unsigned long max = ptr->values[1]; | |
1101 | u8 min_type = ptr->min_type; | |
1102 | const u8 max_type = ptr->max_type; | |
1103 | memset(buffer, 0, buffer_len); | |
1104 | buffer_len -= 2; | |
1105 | for (i = 0; i < 2; i++) { | |
1106 | int len; | |
1107 | switch (min_type) { | |
1108 | case TOMOYO_VALUE_TYPE_HEXADECIMAL: | |
1109 | snprintf(buffer, buffer_len, "0x%lX", min); | |
1110 | break; | |
1111 | case TOMOYO_VALUE_TYPE_OCTAL: | |
1112 | snprintf(buffer, buffer_len, "0%lo", min); | |
1113 | break; | |
1114 | default: | |
1115 | snprintf(buffer, buffer_len, "%lu", min); | |
1116 | break; | |
1117 | } | |
1118 | if (min == max && min_type == max_type) | |
1119 | break; | |
1120 | len = strlen(buffer); | |
1121 | buffer[len++] = '-'; | |
1122 | buffer += len; | |
1123 | buffer_len -= len; | |
1124 | min_type = max_type; | |
1125 | min = max; | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = { | |
1130 | [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP, | |
1131 | [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP | |
1132 | }; | |
1133 | ||
9590837b | 1134 | /** |
31845e8c | 1135 | * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list. |
9590837b KT |
1136 | * |
1137 | * @head: Pointer to "struct tomoyo_io_buffer". | |
31845e8c TH |
1138 | * @idx: Index number. |
1139 | * | |
1140 | * Returns true on success, false otherwise. | |
9590837b | 1141 | * |
fdb8ebb7 | 1142 | * Caller holds tomoyo_read_lock(). |
9590837b | 1143 | */ |
31845e8c | 1144 | static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) |
9590837b | 1145 | { |
31845e8c TH |
1146 | const char *w[3] = { "", "", "" }; |
1147 | w[0] = tomoyo_group_name[idx]; | |
475e6fa3 | 1148 | list_for_each_cookie(head->read_var1, &tomoyo_group_list[idx]) { |
31845e8c | 1149 | struct tomoyo_group *group = |
475e6fa3 | 1150 | list_entry(head->read_var1, typeof(*group), list); |
31845e8c | 1151 | w[1] = group->group_name->name; |
475e6fa3 | 1152 | list_for_each_cookie(head->read_var2, &group->member_list) { |
31845e8c TH |
1153 | char buffer[128]; |
1154 | struct tomoyo_acl_head *ptr = | |
475e6fa3 | 1155 | list_entry(head->read_var2, typeof(*ptr), list); |
31845e8c TH |
1156 | if (ptr->is_deleted) |
1157 | continue; | |
1158 | if (idx == TOMOYO_PATH_GROUP) { | |
1159 | w[2] = container_of(ptr, | |
1160 | struct tomoyo_path_group, | |
1161 | head)->member_name->name; | |
1162 | } else if (idx == TOMOYO_NUMBER_GROUP) { | |
1163 | tomoyo_print_number(buffer, sizeof(buffer), | |
1164 | &container_of | |
1165 | (ptr, struct | |
1166 | tomoyo_number_group, | |
1167 | head)->number); | |
1168 | w[2] = buffer; | |
1169 | } | |
1170 | if (!tomoyo_io_printf(head, "%s%s %s\n", w[0], w[1], | |
1171 | w[2])) | |
1172 | return false; | |
1173 | } | |
475e6fa3 | 1174 | head->read_var2 = NULL; |
31845e8c | 1175 | } |
475e6fa3 | 1176 | head->read_var1 = NULL; |
31845e8c TH |
1177 | return true; |
1178 | } | |
1179 | ||
1180 | /** | |
1181 | * tomoyo_read_policy - Read "struct tomoyo_..._entry" list. | |
1182 | * | |
1183 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1184 | * @idx: Index number. | |
1185 | * | |
1186 | * Returns true on success, false otherwise. | |
1187 | * | |
1188 | * Caller holds tomoyo_read_lock(). | |
1189 | */ | |
1190 | static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) | |
1191 | { | |
475e6fa3 | 1192 | list_for_each_cookie(head->read_var2, &tomoyo_policy_list[idx]) { |
31845e8c | 1193 | const char *w[4] = { "", "", "", "" }; |
475e6fa3 TH |
1194 | struct tomoyo_acl_head *acl = |
1195 | container_of(head->read_var2, typeof(*acl), list); | |
31845e8c TH |
1196 | if (acl->is_deleted) |
1197 | continue; | |
1198 | switch (idx) { | |
5448ec4f | 1199 | case TOMOYO_ID_TRANSITION_CONTROL: |
31845e8c | 1200 | { |
5448ec4f | 1201 | struct tomoyo_transition_control *ptr = |
31845e8c | 1202 | container_of(acl, typeof(*ptr), head); |
5448ec4f TH |
1203 | w[0] = tomoyo_transition_type[ptr->type]; |
1204 | if (ptr->program) | |
31845e8c | 1205 | w[1] = ptr->program->name; |
5448ec4f | 1206 | if (ptr->domainname) |
31845e8c | 1207 | w[3] = ptr->domainname->name; |
5448ec4f TH |
1208 | if (w[1][0] && w[3][0]) |
1209 | w[2] = " from "; | |
31845e8c TH |
1210 | } |
1211 | break; | |
1212 | case TOMOYO_ID_GLOBALLY_READABLE: | |
1213 | { | |
1214 | struct tomoyo_globally_readable_file_entry *ptr | |
1215 | = container_of(acl, typeof(*ptr), head); | |
1216 | w[0] = TOMOYO_KEYWORD_ALLOW_READ; | |
1217 | w[1] = ptr->filename->name; | |
1218 | } | |
1219 | break; | |
31845e8c TH |
1220 | case TOMOYO_ID_AGGREGATOR: |
1221 | { | |
1222 | struct tomoyo_aggregator_entry *ptr = | |
1223 | container_of(acl, typeof(*ptr), head); | |
1224 | w[0] = TOMOYO_KEYWORD_AGGREGATOR; | |
1225 | w[1] = ptr->original_name->name; | |
1226 | w[2] = " "; | |
1227 | w[3] = ptr->aggregated_name->name; | |
1228 | } | |
1229 | break; | |
1230 | case TOMOYO_ID_PATTERN: | |
1231 | { | |
1232 | struct tomoyo_pattern_entry *ptr = | |
1233 | container_of(acl, typeof(*ptr), head); | |
1234 | w[0] = TOMOYO_KEYWORD_FILE_PATTERN; | |
1235 | w[1] = ptr->pattern->name; | |
1236 | } | |
1237 | break; | |
1238 | case TOMOYO_ID_NO_REWRITE: | |
1239 | { | |
1240 | struct tomoyo_no_rewrite_entry *ptr = | |
1241 | container_of(acl, typeof(*ptr), head); | |
1242 | w[0] = TOMOYO_KEYWORD_DENY_REWRITE; | |
1243 | w[1] = ptr->pattern->name; | |
1244 | } | |
1245 | break; | |
1246 | default: | |
1247 | continue; | |
9590837b | 1248 | } |
31845e8c TH |
1249 | if (!tomoyo_io_printf(head, "%s%s%s%s\n", w[0], w[1], w[2], |
1250 | w[3])) | |
1251 | return false; | |
9590837b | 1252 | } |
475e6fa3 | 1253 | head->read_var2 = NULL; |
31845e8c TH |
1254 | return true; |
1255 | } | |
1256 | ||
1257 | /** | |
1258 | * tomoyo_read_exception_policy - Read exception policy. | |
1259 | * | |
1260 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1261 | * | |
1262 | * Caller holds tomoyo_read_lock(). | |
1263 | */ | |
1264 | static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) | |
1265 | { | |
1266 | if (head->read_eof) | |
1267 | return; | |
1268 | while (head->read_step < TOMOYO_MAX_POLICY && | |
1269 | tomoyo_read_policy(head, head->read_step)) | |
1270 | head->read_step++; | |
1271 | if (head->read_step < TOMOYO_MAX_POLICY) | |
1272 | return; | |
1273 | while (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP && | |
1274 | tomoyo_read_group(head, head->read_step - TOMOYO_MAX_POLICY)) | |
1275 | head->read_step++; | |
1276 | if (head->read_step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP) | |
1277 | return; | |
1278 | head->read_eof = true; | |
9590837b KT |
1279 | } |
1280 | ||
17fcfbd9 TH |
1281 | /** |
1282 | * tomoyo_print_header - Get header line of audit log. | |
1283 | * | |
1284 | * @r: Pointer to "struct tomoyo_request_info". | |
1285 | * | |
1286 | * Returns string representation. | |
1287 | * | |
1288 | * This function uses kmalloc(), so caller must kfree() if this function | |
1289 | * didn't return NULL. | |
1290 | */ | |
1291 | static char *tomoyo_print_header(struct tomoyo_request_info *r) | |
1292 | { | |
1293 | static const char *tomoyo_mode_4[4] = { | |
1294 | "disabled", "learning", "permissive", "enforcing" | |
1295 | }; | |
1296 | struct timeval tv; | |
1297 | const pid_t gpid = task_pid_nr(current); | |
1298 | static const int tomoyo_buffer_len = 4096; | |
1299 | char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); | |
1300 | if (!buffer) | |
1301 | return NULL; | |
1302 | do_gettimeofday(&tv); | |
1303 | snprintf(buffer, tomoyo_buffer_len - 1, | |
1304 | "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" | |
1305 | " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" | |
1306 | " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", | |
1307 | tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, | |
1308 | (pid_t) sys_getpid(), (pid_t) sys_getppid(), | |
1309 | current_uid(), current_gid(), current_euid(), | |
1310 | current_egid(), current_suid(), current_sgid(), | |
1311 | current_fsuid(), current_fsgid()); | |
1312 | return buffer; | |
1313 | } | |
1314 | ||
1315 | /** | |
1316 | * tomoyo_init_audit_log - Allocate buffer for audit logs. | |
1317 | * | |
1318 | * @len: Required size. | |
1319 | * @r: Pointer to "struct tomoyo_request_info". | |
1320 | * | |
1321 | * Returns pointer to allocated memory. | |
1322 | * | |
1323 | * The @len is updated to add the header lines' size on success. | |
1324 | * | |
1325 | * This function uses kzalloc(), so caller must kfree() if this function | |
1326 | * didn't return NULL. | |
1327 | */ | |
1328 | static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) | |
1329 | { | |
1330 | char *buf = NULL; | |
1331 | const char *header; | |
1332 | const char *domainname; | |
1333 | if (!r->domain) | |
1334 | r->domain = tomoyo_domain(); | |
1335 | domainname = r->domain->domainname->name; | |
1336 | header = tomoyo_print_header(r); | |
1337 | if (!header) | |
1338 | return NULL; | |
1339 | *len += strlen(domainname) + strlen(header) + 10; | |
1340 | buf = kzalloc(*len, GFP_NOFS); | |
1341 | if (buf) | |
1342 | snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); | |
1343 | kfree(header); | |
1344 | return buf; | |
1345 | } | |
1346 | ||
1347 | /* Wait queue for tomoyo_query_list. */ | |
1348 | static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); | |
1349 | ||
1350 | /* Lock for manipulating tomoyo_query_list. */ | |
1351 | static DEFINE_SPINLOCK(tomoyo_query_list_lock); | |
1352 | ||
1353 | /* Structure for query. */ | |
1354 | struct tomoyo_query_entry { | |
1355 | struct list_head list; | |
1356 | char *query; | |
1357 | int query_len; | |
1358 | unsigned int serial; | |
1359 | int timer; | |
1360 | int answer; | |
1361 | }; | |
1362 | ||
1363 | /* The list for "struct tomoyo_query_entry". */ | |
1364 | static LIST_HEAD(tomoyo_query_list); | |
1365 | ||
1366 | /* | |
1367 | * Number of "struct file" referring /sys/kernel/security/tomoyo/query | |
1368 | * interface. | |
1369 | */ | |
1370 | static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); | |
1371 | ||
1372 | /** | |
1373 | * tomoyo_supervisor - Ask for the supervisor's decision. | |
1374 | * | |
1375 | * @r: Pointer to "struct tomoyo_request_info". | |
1376 | * @fmt: The printf()'s format string, followed by parameters. | |
1377 | * | |
1378 | * Returns 0 if the supervisor decided to permit the access request which | |
1379 | * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the | |
1380 | * supervisor decided to retry the access request which violated the policy in | |
1381 | * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. | |
1382 | */ | |
1383 | int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) | |
1384 | { | |
1385 | va_list args; | |
1386 | int error = -EPERM; | |
1387 | int pos; | |
1388 | int len; | |
1389 | static unsigned int tomoyo_serial; | |
1390 | struct tomoyo_query_entry *tomoyo_query_entry = NULL; | |
1391 | bool quota_exceeded = false; | |
1392 | char *header; | |
1393 | switch (r->mode) { | |
1394 | char *buffer; | |
1395 | case TOMOYO_CONFIG_LEARNING: | |
1396 | if (!tomoyo_domain_quota_is_ok(r)) | |
1397 | return 0; | |
1398 | va_start(args, fmt); | |
1399 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; | |
1400 | va_end(args); | |
1401 | buffer = kmalloc(len, GFP_NOFS); | |
1402 | if (!buffer) | |
1403 | return 0; | |
1404 | va_start(args, fmt); | |
1405 | vsnprintf(buffer, len - 1, fmt, args); | |
1406 | va_end(args); | |
1407 | tomoyo_normalize_line(buffer); | |
1408 | tomoyo_write_domain_policy2(buffer, r->domain, false); | |
1409 | kfree(buffer); | |
1410 | /* fall through */ | |
1411 | case TOMOYO_CONFIG_PERMISSIVE: | |
1412 | return 0; | |
1413 | } | |
1414 | if (!r->domain) | |
1415 | r->domain = tomoyo_domain(); | |
1416 | if (!atomic_read(&tomoyo_query_observers)) | |
1417 | return -EPERM; | |
1418 | va_start(args, fmt); | |
1419 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; | |
1420 | va_end(args); | |
1421 | header = tomoyo_init_audit_log(&len, r); | |
1422 | if (!header) | |
1423 | goto out; | |
1424 | tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); | |
1425 | if (!tomoyo_query_entry) | |
1426 | goto out; | |
1427 | tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); | |
1428 | if (!tomoyo_query_entry->query) | |
1429 | goto out; | |
1430 | len = ksize(tomoyo_query_entry->query); | |
1431 | INIT_LIST_HEAD(&tomoyo_query_entry->list); | |
1432 | spin_lock(&tomoyo_query_list_lock); | |
1433 | if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + | |
1434 | sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { | |
1435 | quota_exceeded = true; | |
1436 | } else { | |
1437 | tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); | |
1438 | tomoyo_query_entry->serial = tomoyo_serial++; | |
1439 | } | |
1440 | spin_unlock(&tomoyo_query_list_lock); | |
1441 | if (quota_exceeded) | |
1442 | goto out; | |
1443 | pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", | |
1444 | tomoyo_query_entry->serial, r->retry, header); | |
1445 | kfree(header); | |
1446 | header = NULL; | |
1447 | va_start(args, fmt); | |
1448 | vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); | |
1449 | tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; | |
1450 | va_end(args); | |
1451 | spin_lock(&tomoyo_query_list_lock); | |
1452 | list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); | |
1453 | spin_unlock(&tomoyo_query_list_lock); | |
1454 | /* Give 10 seconds for supervisor's opinion. */ | |
1455 | for (tomoyo_query_entry->timer = 0; | |
1456 | atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; | |
1457 | tomoyo_query_entry->timer++) { | |
1458 | wake_up(&tomoyo_query_wait); | |
1459 | set_current_state(TASK_INTERRUPTIBLE); | |
1460 | schedule_timeout(HZ / 10); | |
1461 | if (tomoyo_query_entry->answer) | |
1462 | break; | |
1463 | } | |
1464 | spin_lock(&tomoyo_query_list_lock); | |
1465 | list_del(&tomoyo_query_entry->list); | |
1466 | tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); | |
1467 | spin_unlock(&tomoyo_query_list_lock); | |
1468 | switch (tomoyo_query_entry->answer) { | |
1469 | case 3: /* Asked to retry by administrator. */ | |
1470 | error = TOMOYO_RETRY_REQUEST; | |
1471 | r->retry++; | |
1472 | break; | |
1473 | case 1: | |
1474 | /* Granted by administrator. */ | |
1475 | error = 0; | |
1476 | break; | |
1477 | case 0: | |
1478 | /* Timed out. */ | |
1479 | break; | |
1480 | default: | |
1481 | /* Rejected by administrator. */ | |
1482 | break; | |
1483 | } | |
1484 | out: | |
1485 | if (tomoyo_query_entry) | |
1486 | kfree(tomoyo_query_entry->query); | |
1487 | kfree(tomoyo_query_entry); | |
1488 | kfree(header); | |
1489 | return error; | |
1490 | } | |
1491 | ||
1492 | /** | |
1493 | * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. | |
1494 | * | |
1495 | * @file: Pointer to "struct file". | |
1496 | * @wait: Pointer to "poll_table". | |
1497 | * | |
1498 | * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. | |
1499 | * | |
1500 | * Waits for access requests which violated policy in enforcing mode. | |
1501 | */ | |
1502 | static int tomoyo_poll_query(struct file *file, poll_table *wait) | |
1503 | { | |
1504 | struct list_head *tmp; | |
1505 | bool found = false; | |
1506 | u8 i; | |
1507 | for (i = 0; i < 2; i++) { | |
1508 | spin_lock(&tomoyo_query_list_lock); | |
1509 | list_for_each(tmp, &tomoyo_query_list) { | |
1510 | struct tomoyo_query_entry *ptr | |
1511 | = list_entry(tmp, struct tomoyo_query_entry, | |
1512 | list); | |
1513 | if (ptr->answer) | |
1514 | continue; | |
1515 | found = true; | |
1516 | break; | |
1517 | } | |
1518 | spin_unlock(&tomoyo_query_list_lock); | |
1519 | if (found) | |
1520 | return POLLIN | POLLRDNORM; | |
1521 | if (i) | |
1522 | break; | |
1523 | poll_wait(file, &tomoyo_query_wait, wait); | |
1524 | } | |
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * tomoyo_read_query - Read access requests which violated policy in enforcing mode. | |
1530 | * | |
1531 | * @head: Pointer to "struct tomoyo_io_buffer". | |
17fcfbd9 | 1532 | */ |
8fbe71f0 | 1533 | static void tomoyo_read_query(struct tomoyo_io_buffer *head) |
17fcfbd9 TH |
1534 | { |
1535 | struct list_head *tmp; | |
1536 | int pos = 0; | |
1537 | int len = 0; | |
1538 | char *buf; | |
1539 | if (head->read_avail) | |
8fbe71f0 | 1540 | return; |
17fcfbd9 TH |
1541 | if (head->read_buf) { |
1542 | kfree(head->read_buf); | |
1543 | head->read_buf = NULL; | |
1544 | head->readbuf_size = 0; | |
1545 | } | |
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 | if (ptr->answer) | |
1551 | continue; | |
1552 | if (pos++ != head->read_step) | |
1553 | continue; | |
1554 | len = ptr->query_len; | |
1555 | break; | |
1556 | } | |
1557 | spin_unlock(&tomoyo_query_list_lock); | |
1558 | if (!len) { | |
1559 | head->read_step = 0; | |
8fbe71f0 | 1560 | return; |
17fcfbd9 TH |
1561 | } |
1562 | buf = kzalloc(len, GFP_NOFS); | |
1563 | if (!buf) | |
8fbe71f0 | 1564 | return; |
17fcfbd9 TH |
1565 | pos = 0; |
1566 | spin_lock(&tomoyo_query_list_lock); | |
1567 | list_for_each(tmp, &tomoyo_query_list) { | |
1568 | struct tomoyo_query_entry *ptr | |
1569 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1570 | if (ptr->answer) | |
1571 | continue; | |
1572 | if (pos++ != head->read_step) | |
1573 | continue; | |
1574 | /* | |
1575 | * Some query can be skipped because tomoyo_query_list | |
1576 | * can change, but I don't care. | |
1577 | */ | |
1578 | if (len == ptr->query_len) | |
1579 | memmove(buf, ptr->query, len); | |
1580 | break; | |
1581 | } | |
1582 | spin_unlock(&tomoyo_query_list_lock); | |
1583 | if (buf[0]) { | |
1584 | head->read_avail = len; | |
1585 | head->readbuf_size = head->read_avail; | |
1586 | head->read_buf = buf; | |
1587 | head->read_step++; | |
1588 | } else { | |
1589 | kfree(buf); | |
1590 | } | |
17fcfbd9 TH |
1591 | } |
1592 | ||
1593 | /** | |
1594 | * tomoyo_write_answer - Write the supervisor's decision. | |
1595 | * | |
1596 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1597 | * | |
1598 | * Returns 0 on success, -EINVAL otherwise. | |
1599 | */ | |
1600 | static int tomoyo_write_answer(struct tomoyo_io_buffer *head) | |
1601 | { | |
1602 | char *data = head->write_buf; | |
1603 | struct list_head *tmp; | |
1604 | unsigned int serial; | |
1605 | unsigned int answer; | |
1606 | spin_lock(&tomoyo_query_list_lock); | |
1607 | list_for_each(tmp, &tomoyo_query_list) { | |
1608 | struct tomoyo_query_entry *ptr | |
1609 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1610 | ptr->timer = 0; | |
1611 | } | |
1612 | spin_unlock(&tomoyo_query_list_lock); | |
1613 | if (sscanf(data, "A%u=%u", &serial, &answer) != 2) | |
1614 | return -EINVAL; | |
1615 | spin_lock(&tomoyo_query_list_lock); | |
1616 | list_for_each(tmp, &tomoyo_query_list) { | |
1617 | struct tomoyo_query_entry *ptr | |
1618 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1619 | if (ptr->serial != serial) | |
1620 | continue; | |
1621 | if (!ptr->answer) | |
1622 | ptr->answer = answer; | |
1623 | break; | |
1624 | } | |
1625 | spin_unlock(&tomoyo_query_list_lock); | |
1626 | return 0; | |
1627 | } | |
1628 | ||
9590837b KT |
1629 | /** |
1630 | * tomoyo_read_version: Get version. | |
1631 | * | |
1632 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1633 | * | |
1634 | * Returns version information. | |
1635 | */ | |
8fbe71f0 | 1636 | static void tomoyo_read_version(struct tomoyo_io_buffer *head) |
9590837b KT |
1637 | { |
1638 | if (!head->read_eof) { | |
57c2590f | 1639 | tomoyo_io_printf(head, "2.3.0-pre"); |
9590837b KT |
1640 | head->read_eof = true; |
1641 | } | |
9590837b KT |
1642 | } |
1643 | ||
1644 | /** | |
1645 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1646 | * | |
1647 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1648 | * | |
1649 | * Returns the current process's domainname. | |
1650 | */ | |
8fbe71f0 | 1651 | static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) |
9590837b KT |
1652 | { |
1653 | if (!head->read_eof) { | |
1654 | /* | |
1655 | * tomoyo_domain()->domainname != NULL | |
1656 | * because every process belongs to a domain and | |
1657 | * the domain's name cannot be NULL. | |
1658 | */ | |
1659 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1660 | head->read_eof = true; | |
1661 | } | |
9590837b KT |
1662 | } |
1663 | ||
1664 | /** | |
1665 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1666 | * | |
1667 | * @type: Type of interface. | |
1668 | * @file: Pointer to "struct file". | |
1669 | * | |
1670 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1671 | * |
1672 | * Caller acquires tomoyo_read_lock(). | |
9590837b | 1673 | */ |
c3ef1500 | 1674 | int tomoyo_open_control(const u8 type, struct file *file) |
9590837b | 1675 | { |
4e5d6f7e | 1676 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1677 | |
1678 | if (!head) | |
1679 | return -ENOMEM; | |
1680 | mutex_init(&head->io_sem); | |
17fcfbd9 | 1681 | head->type = type; |
9590837b KT |
1682 | switch (type) { |
1683 | case TOMOYO_DOMAINPOLICY: | |
1684 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1685 | head->write = tomoyo_write_domain_policy; | |
1686 | head->read = tomoyo_read_domain_policy; | |
1687 | break; | |
1688 | case TOMOYO_EXCEPTIONPOLICY: | |
1689 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1690 | head->write = tomoyo_write_exception_policy; | |
1691 | head->read = tomoyo_read_exception_policy; | |
1692 | break; | |
1693 | case TOMOYO_SELFDOMAIN: | |
1694 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1695 | head->read = tomoyo_read_self_domain; | |
1696 | break; | |
1697 | case TOMOYO_DOMAIN_STATUS: | |
1698 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1699 | head->write = tomoyo_write_domain_profile; | |
1700 | head->read = tomoyo_read_domain_profile; | |
1701 | break; | |
1702 | case TOMOYO_PROCESS_STATUS: | |
1703 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1704 | head->write = tomoyo_write_pid; | |
1705 | head->read = tomoyo_read_pid; | |
1706 | break; | |
1707 | case TOMOYO_VERSION: | |
1708 | /* /sys/kernel/security/tomoyo/version */ | |
1709 | head->read = tomoyo_read_version; | |
1710 | head->readbuf_size = 128; | |
1711 | break; | |
1712 | case TOMOYO_MEMINFO: | |
1713 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1714 | head->write = tomoyo_write_memory_quota; | |
1715 | head->read = tomoyo_read_memory_counter; | |
1716 | head->readbuf_size = 512; | |
1717 | break; | |
1718 | case TOMOYO_PROFILE: | |
1719 | /* /sys/kernel/security/tomoyo/profile */ | |
1720 | head->write = tomoyo_write_profile; | |
1721 | head->read = tomoyo_read_profile; | |
1722 | break; | |
17fcfbd9 TH |
1723 | case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
1724 | head->poll = tomoyo_poll_query; | |
1725 | head->write = tomoyo_write_answer; | |
1726 | head->read = tomoyo_read_query; | |
1727 | break; | |
9590837b KT |
1728 | case TOMOYO_MANAGER: |
1729 | /* /sys/kernel/security/tomoyo/manager */ | |
1730 | head->write = tomoyo_write_manager_policy; | |
1731 | head->read = tomoyo_read_manager_policy; | |
1732 | break; | |
1733 | } | |
1734 | if (!(file->f_mode & FMODE_READ)) { | |
1735 | /* | |
1736 | * No need to allocate read_buf since it is not opened | |
1737 | * for reading. | |
1738 | */ | |
1739 | head->read = NULL; | |
17fcfbd9 TH |
1740 | head->poll = NULL; |
1741 | } else if (!head->poll) { | |
1742 | /* Don't allocate read_buf for poll() access. */ | |
9590837b KT |
1743 | if (!head->readbuf_size) |
1744 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 1745 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 1746 | if (!head->read_buf) { |
8e2d39a1 | 1747 | kfree(head); |
9590837b KT |
1748 | return -ENOMEM; |
1749 | } | |
1750 | } | |
1751 | if (!(file->f_mode & FMODE_WRITE)) { | |
1752 | /* | |
1753 | * No need to allocate write_buf since it is not opened | |
1754 | * for writing. | |
1755 | */ | |
1756 | head->write = NULL; | |
1757 | } else if (head->write) { | |
1758 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 1759 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 1760 | if (!head->write_buf) { |
8e2d39a1 TH |
1761 | kfree(head->read_buf); |
1762 | kfree(head); | |
9590837b KT |
1763 | return -ENOMEM; |
1764 | } | |
1765 | } | |
17fcfbd9 TH |
1766 | if (type != TOMOYO_QUERY) |
1767 | head->reader_idx = tomoyo_read_lock(); | |
9590837b KT |
1768 | file->private_data = head; |
1769 | /* | |
1770 | * Call the handler now if the file is | |
1771 | * /sys/kernel/security/tomoyo/self_domain | |
1772 | * so that the user can use | |
1773 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1774 | * to know the current process's domainname. | |
1775 | */ | |
1776 | if (type == TOMOYO_SELFDOMAIN) | |
1777 | tomoyo_read_control(file, NULL, 0); | |
17fcfbd9 TH |
1778 | /* |
1779 | * If the file is /sys/kernel/security/tomoyo/query , increment the | |
1780 | * observer counter. | |
1781 | * The obserber counter is used by tomoyo_supervisor() to see if | |
1782 | * there is some process monitoring /sys/kernel/security/tomoyo/query. | |
1783 | */ | |
1784 | else if (type == TOMOYO_QUERY) | |
1785 | atomic_inc(&tomoyo_query_observers); | |
9590837b KT |
1786 | return 0; |
1787 | } | |
1788 | ||
17fcfbd9 TH |
1789 | /** |
1790 | * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. | |
1791 | * | |
1792 | * @file: Pointer to "struct file". | |
1793 | * @wait: Pointer to "poll_table". | |
1794 | * | |
1795 | * Waits for read readiness. | |
1796 | * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . | |
1797 | */ | |
1798 | int tomoyo_poll_control(struct file *file, poll_table *wait) | |
1799 | { | |
1800 | struct tomoyo_io_buffer *head = file->private_data; | |
1801 | if (!head->poll) | |
1802 | return -ENOSYS; | |
1803 | return head->poll(file, wait); | |
1804 | } | |
1805 | ||
9590837b KT |
1806 | /** |
1807 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1808 | * | |
1809 | * @file: Pointer to "struct file". | |
1810 | * @buffer: Poiner to buffer to write to. | |
1811 | * @buffer_len: Size of @buffer. | |
1812 | * | |
1813 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
1814 | * |
1815 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1816 | */ |
c3ef1500 TH |
1817 | int tomoyo_read_control(struct file *file, char __user *buffer, |
1818 | const int buffer_len) | |
9590837b KT |
1819 | { |
1820 | int len = 0; | |
1821 | struct tomoyo_io_buffer *head = file->private_data; | |
1822 | char *cp; | |
1823 | ||
1824 | if (!head->read) | |
1825 | return -ENOSYS; | |
1826 | if (mutex_lock_interruptible(&head->io_sem)) | |
1827 | return -EINTR; | |
1828 | /* Call the policy handler. */ | |
8fbe71f0 | 1829 | head->read(head); |
9590837b KT |
1830 | if (len < 0) |
1831 | goto out; | |
1832 | /* Write to buffer. */ | |
1833 | len = head->read_avail; | |
1834 | if (len > buffer_len) | |
1835 | len = buffer_len; | |
1836 | if (!len) | |
1837 | goto out; | |
1838 | /* head->read_buf changes by some functions. */ | |
1839 | cp = head->read_buf; | |
1840 | if (copy_to_user(buffer, cp, len)) { | |
1841 | len = -EFAULT; | |
1842 | goto out; | |
1843 | } | |
1844 | head->read_avail -= len; | |
1845 | memmove(cp, cp + len, head->read_avail); | |
1846 | out: | |
1847 | mutex_unlock(&head->io_sem); | |
1848 | return len; | |
1849 | } | |
1850 | ||
1851 | /** | |
1852 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
1853 | * | |
1854 | * @file: Pointer to "struct file". | |
1855 | * @buffer: Pointer to buffer to read from. | |
1856 | * @buffer_len: Size of @buffer. | |
1857 | * | |
1858 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
1859 | * |
1860 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1861 | */ |
c3ef1500 TH |
1862 | int tomoyo_write_control(struct file *file, const char __user *buffer, |
1863 | const int buffer_len) | |
9590837b KT |
1864 | { |
1865 | struct tomoyo_io_buffer *head = file->private_data; | |
1866 | int error = buffer_len; | |
1867 | int avail_len = buffer_len; | |
1868 | char *cp0 = head->write_buf; | |
1869 | ||
1870 | if (!head->write) | |
1871 | return -ENOSYS; | |
1872 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
1873 | return -EFAULT; | |
1874 | /* Don't allow updating policies by non manager programs. */ | |
1875 | if (head->write != tomoyo_write_pid && | |
1876 | head->write != tomoyo_write_domain_policy && | |
75093152 | 1877 | !tomoyo_policy_manager()) |
9590837b KT |
1878 | return -EPERM; |
1879 | if (mutex_lock_interruptible(&head->io_sem)) | |
1880 | return -EINTR; | |
1881 | /* Read a line and dispatch it to the policy handler. */ | |
1882 | while (avail_len > 0) { | |
1883 | char c; | |
1884 | if (head->write_avail >= head->writebuf_size - 1) { | |
1885 | error = -ENOMEM; | |
1886 | break; | |
1887 | } else if (get_user(c, buffer)) { | |
1888 | error = -EFAULT; | |
1889 | break; | |
1890 | } | |
1891 | buffer++; | |
1892 | avail_len--; | |
1893 | cp0[head->write_avail++] = c; | |
1894 | if (c != '\n') | |
1895 | continue; | |
1896 | cp0[head->write_avail - 1] = '\0'; | |
1897 | head->write_avail = 0; | |
1898 | tomoyo_normalize_line(cp0); | |
1899 | head->write(head); | |
1900 | } | |
1901 | mutex_unlock(&head->io_sem); | |
1902 | return error; | |
1903 | } | |
1904 | ||
1905 | /** | |
1906 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
1907 | * | |
1908 | * @file: Pointer to "struct file". | |
1909 | * | |
1910 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
1911 | * |
1912 | * Caller looses tomoyo_read_lock(). | |
9590837b | 1913 | */ |
c3ef1500 | 1914 | int tomoyo_close_control(struct file *file) |
9590837b KT |
1915 | { |
1916 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 1917 | const bool is_write = !!head->write_buf; |
9590837b | 1918 | |
17fcfbd9 TH |
1919 | /* |
1920 | * If the file is /sys/kernel/security/tomoyo/query , decrement the | |
1921 | * observer counter. | |
1922 | */ | |
1923 | if (head->type == TOMOYO_QUERY) | |
1924 | atomic_dec(&tomoyo_query_observers); | |
1925 | else | |
1926 | tomoyo_read_unlock(head->reader_idx); | |
9590837b | 1927 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 1928 | kfree(head->read_buf); |
9590837b | 1929 | head->read_buf = NULL; |
8e2d39a1 | 1930 | kfree(head->write_buf); |
9590837b | 1931 | head->write_buf = NULL; |
8e2d39a1 | 1932 | kfree(head); |
9590837b KT |
1933 | head = NULL; |
1934 | file->private_data = NULL; | |
847b173e TH |
1935 | if (is_write) |
1936 | tomoyo_run_gc(); | |
9590837b KT |
1937 | return 0; |
1938 | } | |
1939 | ||
9590837b | 1940 | /** |
c3ef1500 | 1941 | * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
9590837b | 1942 | */ |
c3ef1500 | 1943 | void tomoyo_check_profile(void) |
9590837b | 1944 | { |
c3ef1500 TH |
1945 | struct tomoyo_domain_info *domain; |
1946 | const int idx = tomoyo_read_lock(); | |
1947 | tomoyo_policy_loaded = true; | |
1948 | /* Check all profiles currently assigned to domains are defined. */ | |
1949 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
1950 | const u8 profile = domain->profile; | |
1951 | if (tomoyo_profile_ptr[profile]) | |
1952 | continue; | |
1953 | panic("Profile %u (used by '%s') not defined.\n", | |
1954 | profile, domain->domainname->name); | |
1955 | } | |
1956 | tomoyo_read_unlock(idx); | |
57c2590f TH |
1957 | if (tomoyo_profile_version != 20090903) |
1958 | panic("Profile version %u is not supported.\n", | |
1959 | tomoyo_profile_version); | |
1960 | printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); | |
c3ef1500 | 1961 | printk(KERN_INFO "Mandatory Access Control activated.\n"); |
9590837b | 1962 | } |