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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". | |
355 | * | |
356 | * Returns 0. | |
357 | */ | |
358 | static int tomoyo_read_profile(struct tomoyo_io_buffer *head) | |
359 | { | |
57c2590f | 360 | int index; |
9590837b KT |
361 | if (head->read_eof) |
362 | return 0; | |
57c2590f TH |
363 | if (head->read_bit) |
364 | goto body; | |
365 | tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); | |
366 | tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s " | |
367 | "max_entry=%u }\n", | |
368 | tomoyo_yesno(tomoyo_default_profile.preference. | |
369 | learning_verbose), | |
370 | tomoyo_default_profile.preference.learning_max_entry); | |
371 | tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n", | |
372 | tomoyo_yesno(tomoyo_default_profile.preference. | |
373 | permissive_verbose)); | |
374 | tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n", | |
375 | tomoyo_yesno(tomoyo_default_profile.preference. | |
376 | enforcing_verbose)); | |
377 | head->read_bit = 1; | |
378 | body: | |
379 | for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) { | |
380 | bool done; | |
381 | u8 config; | |
382 | int i; | |
383 | int pos; | |
9590837b KT |
384 | const struct tomoyo_profile *profile |
385 | = tomoyo_profile_ptr[index]; | |
57c2590f TH |
386 | const struct tomoyo_path_info *comment; |
387 | head->read_step = index; | |
9590837b KT |
388 | if (!profile) |
389 | continue; | |
57c2590f TH |
390 | pos = head->read_avail; |
391 | comment = profile->comment; | |
392 | done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index, | |
393 | comment ? comment->name : ""); | |
394 | if (!done) | |
395 | goto out; | |
396 | config = profile->default_config; | |
397 | if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index, | |
398 | tomoyo_mode_4[config & 3])) | |
399 | goto out; | |
400 | for (i = 0; i < TOMOYO_MAX_MAC_INDEX + | |
401 | TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { | |
402 | config = profile->config[i]; | |
403 | if (config == TOMOYO_CONFIG_USE_DEFAULT) | |
404 | continue; | |
405 | if (!tomoyo_io_printf(head, | |
406 | "%u-CONFIG::%s={ mode=%s }\n", | |
407 | index, tomoyo_mac_keywords[i], | |
408 | tomoyo_mode_4[config & 3])) | |
409 | goto out; | |
9590837b | 410 | } |
57c2590f TH |
411 | if (profile->learning != &tomoyo_default_profile.preference && |
412 | !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ " | |
413 | "verbose=%s max_entry=%u }\n", index, | |
414 | tomoyo_yesno(profile->preference. | |
415 | learning_verbose), | |
416 | profile->preference.learning_max_entry)) | |
417 | goto out; | |
418 | if (profile->permissive != &tomoyo_default_profile.preference | |
419 | && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ " | |
420 | "verbose=%s }\n", index, | |
421 | tomoyo_yesno(profile->preference. | |
422 | permissive_verbose))) | |
423 | goto out; | |
424 | if (profile->enforcing != &tomoyo_default_profile.preference && | |
425 | !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ " | |
426 | "verbose=%s }\n", index, | |
427 | tomoyo_yesno(profile->preference. | |
428 | enforcing_verbose))) | |
429 | goto out; | |
430 | continue; | |
431 | out: | |
432 | head->read_avail = pos; | |
433 | break; | |
9590837b | 434 | } |
57c2590f | 435 | if (index == TOMOYO_MAX_PROFILES) |
9590837b KT |
436 | head->read_eof = true; |
437 | return 0; | |
438 | } | |
439 | ||
c3fa109a TH |
440 | /* |
441 | * tomoyo_policy_manager_list is used for holding list of domainnames or | |
442 | * programs which are permitted to modify configuration via | |
443 | * /sys/kernel/security/tomoyo/ interface. | |
444 | * | |
445 | * An entry is added by | |
446 | * | |
447 | * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
448 | * /sys/kernel/security/tomoyo/manager | |
449 | * (if you want to specify by a domainname) | |
450 | * | |
451 | * or | |
452 | * | |
9b244373 | 453 | * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager |
c3fa109a TH |
454 | * (if you want to specify by a program's location) |
455 | * | |
456 | * and is deleted by | |
457 | * | |
458 | * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
459 | * /sys/kernel/security/tomoyo/manager | |
460 | * | |
461 | * or | |
462 | * | |
9b244373 | 463 | * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \ |
c3fa109a TH |
464 | * /sys/kernel/security/tomoyo/manager |
465 | * | |
466 | * and all entries are retrieved by | |
467 | * | |
468 | * # cat /sys/kernel/security/tomoyo/manager | |
469 | */ | |
847b173e | 470 | LIST_HEAD(tomoyo_policy_manager_list); |
9590837b | 471 | |
36f5e1ff TH |
472 | static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a, |
473 | const struct tomoyo_acl_head *b) | |
474 | { | |
475 | return container_of(a, struct tomoyo_policy_manager_entry, head) | |
476 | ->manager == | |
477 | container_of(b, struct tomoyo_policy_manager_entry, head) | |
478 | ->manager; | |
479 | } | |
480 | ||
9590837b KT |
481 | /** |
482 | * tomoyo_update_manager_entry - Add a manager entry. | |
483 | * | |
484 | * @manager: The path to manager or the domainnamme. | |
485 | * @is_delete: True if it is a delete request. | |
486 | * | |
487 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
488 | * |
489 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
490 | */ |
491 | static int tomoyo_update_manager_entry(const char *manager, | |
492 | const bool is_delete) | |
493 | { | |
9e4b50e9 | 494 | struct tomoyo_policy_manager_entry e = { }; |
36f5e1ff | 495 | int error; |
9590837b KT |
496 | |
497 | if (tomoyo_is_domain_def(manager)) { | |
17080008 | 498 | if (!tomoyo_is_correct_domain(manager)) |
9590837b | 499 | return -EINVAL; |
9e4b50e9 | 500 | e.is_domain = true; |
9590837b | 501 | } else { |
3f629636 | 502 | if (!tomoyo_is_correct_path(manager)) |
9590837b KT |
503 | return -EINVAL; |
504 | } | |
9e4b50e9 TH |
505 | e.manager = tomoyo_get_name(manager); |
506 | if (!e.manager) | |
9590837b | 507 | return -ENOMEM; |
36f5e1ff TH |
508 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
509 | &tomoyo_policy_manager_list, | |
510 | tomoyo_same_manager_entry); | |
9e4b50e9 | 511 | tomoyo_put_name(e.manager); |
9590837b KT |
512 | return error; |
513 | } | |
514 | ||
515 | /** | |
516 | * tomoyo_write_manager_policy - Write manager policy. | |
517 | * | |
518 | * @head: Pointer to "struct tomoyo_io_buffer". | |
519 | * | |
520 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
521 | * |
522 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
523 | */ |
524 | static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) | |
525 | { | |
526 | char *data = head->write_buf; | |
527 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
528 | ||
529 | if (!strcmp(data, "manage_by_non_root")) { | |
530 | tomoyo_manage_by_non_root = !is_delete; | |
531 | return 0; | |
532 | } | |
533 | return tomoyo_update_manager_entry(data, is_delete); | |
534 | } | |
535 | ||
536 | /** | |
537 | * tomoyo_read_manager_policy - Read manager policy. | |
538 | * | |
539 | * @head: Pointer to "struct tomoyo_io_buffer". | |
540 | * | |
541 | * Returns 0. | |
fdb8ebb7 TH |
542 | * |
543 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
544 | */ |
545 | static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) | |
546 | { | |
547 | struct list_head *pos; | |
548 | bool done = true; | |
549 | ||
550 | if (head->read_eof) | |
551 | return 0; | |
9590837b KT |
552 | list_for_each_cookie(pos, head->read_var2, |
553 | &tomoyo_policy_manager_list) { | |
554 | struct tomoyo_policy_manager_entry *ptr; | |
555 | ptr = list_entry(pos, struct tomoyo_policy_manager_entry, | |
82e0f001 TH |
556 | head.list); |
557 | if (ptr->head.is_deleted) | |
9590837b | 558 | continue; |
7d2948b1 TH |
559 | done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); |
560 | if (!done) | |
9590837b | 561 | break; |
9590837b | 562 | } |
9590837b KT |
563 | head->read_eof = done; |
564 | return 0; | |
565 | } | |
566 | ||
567 | /** | |
568 | * tomoyo_is_policy_manager - Check whether the current process is a policy manager. | |
569 | * | |
570 | * Returns true if the current process is permitted to modify policy | |
571 | * via /sys/kernel/security/tomoyo/ interface. | |
fdb8ebb7 TH |
572 | * |
573 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
574 | */ |
575 | static bool tomoyo_is_policy_manager(void) | |
576 | { | |
577 | struct tomoyo_policy_manager_entry *ptr; | |
578 | const char *exe; | |
579 | const struct task_struct *task = current; | |
580 | const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; | |
581 | bool found = false; | |
582 | ||
583 | if (!tomoyo_policy_loaded) | |
584 | return true; | |
585 | if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) | |
586 | return false; | |
82e0f001 TH |
587 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) { |
588 | if (!ptr->head.is_deleted && ptr->is_domain | |
9590837b KT |
589 | && !tomoyo_pathcmp(domainname, ptr->manager)) { |
590 | found = true; | |
591 | break; | |
592 | } | |
593 | } | |
9590837b KT |
594 | if (found) |
595 | return true; | |
596 | exe = tomoyo_get_exe(); | |
597 | if (!exe) | |
598 | return false; | |
82e0f001 TH |
599 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) { |
600 | if (!ptr->head.is_deleted && !ptr->is_domain | |
9590837b KT |
601 | && !strcmp(exe, ptr->manager->name)) { |
602 | found = true; | |
603 | break; | |
604 | } | |
605 | } | |
9590837b KT |
606 | if (!found) { /* Reduce error messages. */ |
607 | static pid_t last_pid; | |
608 | const pid_t pid = current->pid; | |
609 | if (last_pid != pid) { | |
610 | printk(KERN_WARNING "%s ( %s ) is not permitted to " | |
611 | "update policies.\n", domainname->name, exe); | |
612 | last_pid = pid; | |
613 | } | |
614 | } | |
8e2d39a1 | 615 | kfree(exe); |
9590837b KT |
616 | return found; |
617 | } | |
618 | ||
619 | /** | |
620 | * tomoyo_is_select_one - Parse select command. | |
621 | * | |
622 | * @head: Pointer to "struct tomoyo_io_buffer". | |
623 | * @data: String to parse. | |
624 | * | |
625 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
626 | * |
627 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
628 | */ |
629 | static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head, | |
630 | const char *data) | |
631 | { | |
632 | unsigned int pid; | |
633 | struct tomoyo_domain_info *domain = NULL; | |
9b244373 | 634 | bool global_pid = false; |
9590837b | 635 | |
9b244373 TH |
636 | if (sscanf(data, "pid=%u", &pid) == 1 || |
637 | (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { | |
9590837b | 638 | struct task_struct *p; |
1fcdc7c5 | 639 | rcu_read_lock(); |
9590837b | 640 | read_lock(&tasklist_lock); |
9b244373 TH |
641 | if (global_pid) |
642 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
643 | else | |
644 | p = find_task_by_vpid(pid); | |
9590837b KT |
645 | if (p) |
646 | domain = tomoyo_real_domain(p); | |
647 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 648 | rcu_read_unlock(); |
9590837b | 649 | } else if (!strncmp(data, "domain=", 7)) { |
fdb8ebb7 | 650 | if (tomoyo_is_domain_def(data + 7)) |
9590837b | 651 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
652 | } else |
653 | return false; | |
654 | head->write_var1 = domain; | |
655 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
656 | if (!head->read_buf) | |
657 | return true; /* Do nothing if open(O_WRONLY). */ | |
658 | head->read_avail = 0; | |
659 | tomoyo_io_printf(head, "# select %s\n", data); | |
660 | head->read_single_domain = true; | |
661 | head->read_eof = !domain; | |
662 | if (domain) { | |
663 | struct tomoyo_domain_info *d; | |
664 | head->read_var1 = NULL; | |
fdb8ebb7 | 665 | list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { |
9590837b KT |
666 | if (d == domain) |
667 | break; | |
668 | head->read_var1 = &d->list; | |
669 | } | |
9590837b KT |
670 | head->read_var2 = NULL; |
671 | head->read_bit = 0; | |
672 | head->read_step = 0; | |
673 | if (domain->is_deleted) | |
674 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
675 | } | |
676 | return true; | |
677 | } | |
678 | ||
ccf135f5 TH |
679 | /** |
680 | * tomoyo_delete_domain - Delete a domain. | |
681 | * | |
682 | * @domainname: The name of domain. | |
683 | * | |
684 | * Returns 0. | |
fdb8ebb7 TH |
685 | * |
686 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
687 | */ |
688 | static int tomoyo_delete_domain(char *domainname) | |
689 | { | |
690 | struct tomoyo_domain_info *domain; | |
691 | struct tomoyo_path_info name; | |
692 | ||
693 | name.name = domainname; | |
694 | tomoyo_fill_path_info(&name); | |
29282381 TH |
695 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
696 | return 0; | |
ccf135f5 | 697 | /* Is there an active domain? */ |
fdb8ebb7 | 698 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
699 | /* Never delete tomoyo_kernel_domain */ |
700 | if (domain == &tomoyo_kernel_domain) | |
701 | continue; | |
702 | if (domain->is_deleted || | |
703 | tomoyo_pathcmp(domain->domainname, &name)) | |
704 | continue; | |
705 | domain->is_deleted = true; | |
706 | break; | |
707 | } | |
f737d95d | 708 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
709 | return 0; |
710 | } | |
711 | ||
17fcfbd9 TH |
712 | /** |
713 | * tomoyo_write_domain_policy2 - Write domain policy. | |
714 | * | |
715 | * @head: Pointer to "struct tomoyo_io_buffer". | |
716 | * | |
717 | * Returns 0 on success, negative value otherwise. | |
718 | * | |
719 | * Caller holds tomoyo_read_lock(). | |
720 | */ | |
721 | static int tomoyo_write_domain_policy2(char *data, | |
722 | struct tomoyo_domain_info *domain, | |
723 | const bool is_delete) | |
724 | { | |
725 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) | |
726 | return tomoyo_write_mount_policy(data, domain, is_delete); | |
727 | return tomoyo_write_file_policy(data, domain, is_delete); | |
728 | } | |
729 | ||
9590837b KT |
730 | /** |
731 | * tomoyo_write_domain_policy - Write domain policy. | |
732 | * | |
733 | * @head: Pointer to "struct tomoyo_io_buffer". | |
734 | * | |
735 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
736 | * |
737 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
738 | */ |
739 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
740 | { | |
741 | char *data = head->write_buf; | |
742 | struct tomoyo_domain_info *domain = head->write_var1; | |
743 | bool is_delete = false; | |
744 | bool is_select = false; | |
9590837b KT |
745 | unsigned int profile; |
746 | ||
747 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
748 | is_delete = true; | |
749 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
750 | is_select = true; | |
9590837b KT |
751 | if (is_select && tomoyo_is_select_one(head, data)) |
752 | return 0; | |
753 | /* Don't allow updating policies by non manager programs. */ | |
754 | if (!tomoyo_is_policy_manager()) | |
755 | return -EPERM; | |
756 | if (tomoyo_is_domain_def(data)) { | |
757 | domain = NULL; | |
758 | if (is_delete) | |
759 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 760 | else if (is_select) |
9590837b | 761 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 762 | else |
9590837b KT |
763 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
764 | head->write_var1 = domain; | |
765 | return 0; | |
766 | } | |
767 | if (!domain) | |
768 | return -EINVAL; | |
769 | ||
770 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
771 | && profile < TOMOYO_MAX_PROFILES) { | |
772 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
773 | domain->profile = (u8) profile; | |
774 | return 0; | |
775 | } | |
776 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 777 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
778 | return 0; |
779 | } | |
9b244373 TH |
780 | if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { |
781 | domain->quota_warned = !is_delete; | |
782 | return 0; | |
783 | } | |
784 | if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { | |
785 | domain->transition_failed = !is_delete; | |
786 | return 0; | |
787 | } | |
17fcfbd9 | 788 | return tomoyo_write_domain_policy2(data, domain, is_delete); |
9590837b KT |
789 | } |
790 | ||
791 | /** | |
7ef61233 | 792 | * tomoyo_print_path_acl - Print a single path ACL entry. |
9590837b KT |
793 | * |
794 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 795 | * @ptr: Pointer to "struct tomoyo_path_acl". |
9590837b KT |
796 | * |
797 | * Returns true on success, false otherwise. | |
798 | */ | |
7ef61233 TH |
799 | static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, |
800 | struct tomoyo_path_acl *ptr) | |
9590837b KT |
801 | { |
802 | int pos; | |
803 | u8 bit; | |
a1f9bb6a | 804 | const u16 perm = ptr->perm; |
9590837b | 805 | |
7ef61233 | 806 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { |
9590837b KT |
807 | if (!(perm & (1 << bit))) |
808 | continue; | |
809 | /* Print "read/write" instead of "read" and "write". */ | |
7ef61233 TH |
810 | if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) |
811 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9590837b | 812 | continue; |
9590837b | 813 | pos = head->read_avail; |
7762fbff TH |
814 | if (!tomoyo_io_printf(head, "allow_%s ", |
815 | tomoyo_path2keyword(bit)) || | |
816 | !tomoyo_print_name_union(head, &ptr->name) || | |
817 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
818 | goto out; |
819 | } | |
820 | head->read_bit = 0; | |
821 | return true; | |
822 | out: | |
823 | head->read_bit = bit; | |
824 | head->read_avail = pos; | |
825 | return false; | |
826 | } | |
827 | ||
828 | /** | |
7ef61233 | 829 | * tomoyo_print_path2_acl - Print a double path ACL entry. |
9590837b KT |
830 | * |
831 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 832 | * @ptr: Pointer to "struct tomoyo_path2_acl". |
9590837b KT |
833 | * |
834 | * Returns true on success, false otherwise. | |
835 | */ | |
7ef61233 TH |
836 | static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, |
837 | struct tomoyo_path2_acl *ptr) | |
9590837b KT |
838 | { |
839 | int pos; | |
9590837b KT |
840 | const u8 perm = ptr->perm; |
841 | u8 bit; | |
842 | ||
7ef61233 | 843 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { |
9590837b KT |
844 | if (!(perm & (1 << bit))) |
845 | continue; | |
9590837b | 846 | pos = head->read_avail; |
7762fbff TH |
847 | if (!tomoyo_io_printf(head, "allow_%s ", |
848 | tomoyo_path22keyword(bit)) || | |
849 | !tomoyo_print_name_union(head, &ptr->name1) || | |
850 | !tomoyo_print_name_union(head, &ptr->name2) || | |
851 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
852 | goto out; |
853 | } | |
854 | head->read_bit = 0; | |
855 | return true; | |
856 | out: | |
857 | head->read_bit = bit; | |
858 | head->read_avail = pos; | |
859 | return false; | |
860 | } | |
861 | ||
a1f9bb6a TH |
862 | /** |
863 | * tomoyo_print_path_number_acl - Print a path_number ACL entry. | |
864 | * | |
865 | * @head: Pointer to "struct tomoyo_io_buffer". | |
866 | * @ptr: Pointer to "struct tomoyo_path_number_acl". | |
867 | * | |
868 | * Returns true on success, false otherwise. | |
869 | */ | |
870 | static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, | |
871 | struct tomoyo_path_number_acl *ptr) | |
872 | { | |
873 | int pos; | |
874 | u8 bit; | |
875 | const u8 perm = ptr->perm; | |
876 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; | |
877 | bit++) { | |
878 | if (!(perm & (1 << bit))) | |
879 | continue; | |
880 | pos = head->read_avail; | |
881 | if (!tomoyo_io_printf(head, "allow_%s", | |
882 | tomoyo_path_number2keyword(bit)) || | |
883 | !tomoyo_print_name_union(head, &ptr->name) || | |
884 | !tomoyo_print_number_union(head, &ptr->number) || | |
885 | !tomoyo_io_printf(head, "\n")) | |
886 | goto out; | |
887 | } | |
888 | head->read_bit = 0; | |
889 | return true; | |
890 | out: | |
891 | head->read_bit = bit; | |
892 | head->read_avail = pos; | |
893 | return false; | |
894 | } | |
895 | ||
896 | /** | |
897 | * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry. | |
898 | * | |
899 | * @head: Pointer to "struct tomoyo_io_buffer". | |
900 | * @ptr: Pointer to "struct tomoyo_path_number3_acl". | |
901 | * | |
902 | * Returns true on success, false otherwise. | |
903 | */ | |
904 | static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head, | |
905 | struct tomoyo_path_number3_acl *ptr) | |
906 | { | |
907 | int pos; | |
908 | u8 bit; | |
909 | const u16 perm = ptr->perm; | |
910 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION; | |
911 | bit++) { | |
912 | if (!(perm & (1 << bit))) | |
913 | continue; | |
914 | pos = head->read_avail; | |
915 | if (!tomoyo_io_printf(head, "allow_%s", | |
916 | tomoyo_path_number32keyword(bit)) || | |
917 | !tomoyo_print_name_union(head, &ptr->name) || | |
918 | !tomoyo_print_number_union(head, &ptr->mode) || | |
919 | !tomoyo_print_number_union(head, &ptr->major) || | |
920 | !tomoyo_print_number_union(head, &ptr->minor) || | |
921 | !tomoyo_io_printf(head, "\n")) | |
922 | goto out; | |
923 | } | |
924 | head->read_bit = 0; | |
925 | return true; | |
926 | out: | |
927 | head->read_bit = bit; | |
928 | head->read_avail = pos; | |
929 | return false; | |
930 | } | |
931 | ||
2106ccd9 TH |
932 | /** |
933 | * tomoyo_print_mount_acl - Print a mount ACL entry. | |
934 | * | |
935 | * @head: Pointer to "struct tomoyo_io_buffer". | |
936 | * @ptr: Pointer to "struct tomoyo_mount_acl". | |
937 | * | |
938 | * Returns true on success, false otherwise. | |
939 | */ | |
940 | static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, | |
941 | struct tomoyo_mount_acl *ptr) | |
942 | { | |
943 | const int pos = head->read_avail; | |
944 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || | |
945 | !tomoyo_print_name_union(head, &ptr->dev_name) || | |
946 | !tomoyo_print_name_union(head, &ptr->dir_name) || | |
947 | !tomoyo_print_name_union(head, &ptr->fs_type) || | |
948 | !tomoyo_print_number_union(head, &ptr->flags) || | |
949 | !tomoyo_io_printf(head, "\n")) { | |
950 | head->read_avail = pos; | |
951 | return false; | |
952 | } | |
953 | return true; | |
954 | } | |
955 | ||
9590837b KT |
956 | /** |
957 | * tomoyo_print_entry - Print an ACL entry. | |
958 | * | |
959 | * @head: Pointer to "struct tomoyo_io_buffer". | |
960 | * @ptr: Pointer to an ACL entry. | |
961 | * | |
962 | * Returns true on success, false otherwise. | |
963 | */ | |
964 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, | |
965 | struct tomoyo_acl_info *ptr) | |
966 | { | |
ea13ddba | 967 | const u8 acl_type = ptr->type; |
9590837b | 968 | |
237ab459 TH |
969 | if (ptr->is_deleted) |
970 | return true; | |
7ef61233 TH |
971 | if (acl_type == TOMOYO_TYPE_PATH_ACL) { |
972 | struct tomoyo_path_acl *acl | |
973 | = container_of(ptr, struct tomoyo_path_acl, head); | |
974 | return tomoyo_print_path_acl(head, acl); | |
9590837b | 975 | } |
7ef61233 TH |
976 | if (acl_type == TOMOYO_TYPE_PATH2_ACL) { |
977 | struct tomoyo_path2_acl *acl | |
978 | = container_of(ptr, struct tomoyo_path2_acl, head); | |
979 | return tomoyo_print_path2_acl(head, acl); | |
9590837b | 980 | } |
a1f9bb6a TH |
981 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
982 | struct tomoyo_path_number_acl *acl | |
983 | = container_of(ptr, struct tomoyo_path_number_acl, | |
984 | head); | |
985 | return tomoyo_print_path_number_acl(head, acl); | |
986 | } | |
987 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) { | |
988 | struct tomoyo_path_number3_acl *acl | |
989 | = container_of(ptr, struct tomoyo_path_number3_acl, | |
990 | head); | |
991 | return tomoyo_print_path_number3_acl(head, acl); | |
992 | } | |
2106ccd9 TH |
993 | if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { |
994 | struct tomoyo_mount_acl *acl | |
995 | = container_of(ptr, struct tomoyo_mount_acl, head); | |
996 | return tomoyo_print_mount_acl(head, acl); | |
997 | } | |
9590837b KT |
998 | BUG(); /* This must not happen. */ |
999 | return false; | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * tomoyo_read_domain_policy - Read domain policy. | |
1004 | * | |
1005 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1006 | * | |
1007 | * Returns 0. | |
fdb8ebb7 TH |
1008 | * |
1009 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1010 | */ |
1011 | static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) | |
1012 | { | |
1013 | struct list_head *dpos; | |
1014 | struct list_head *apos; | |
1015 | bool done = true; | |
1016 | ||
1017 | if (head->read_eof) | |
1018 | return 0; | |
1019 | if (head->read_step == 0) | |
1020 | head->read_step = 1; | |
9590837b KT |
1021 | list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { |
1022 | struct tomoyo_domain_info *domain; | |
1023 | const char *quota_exceeded = ""; | |
1024 | const char *transition_failed = ""; | |
1025 | const char *ignore_global_allow_read = ""; | |
1026 | domain = list_entry(dpos, struct tomoyo_domain_info, list); | |
1027 | if (head->read_step != 1) | |
1028 | goto acl_loop; | |
1029 | if (domain->is_deleted && !head->read_single_domain) | |
1030 | continue; | |
1031 | /* Print domainname and flags. */ | |
1032 | if (domain->quota_warned) | |
1033 | quota_exceeded = "quota_exceeded\n"; | |
ea13ddba | 1034 | if (domain->transition_failed) |
9590837b | 1035 | transition_failed = "transition_failed\n"; |
ea13ddba | 1036 | if (domain->ignore_global_allow_read) |
9590837b KT |
1037 | ignore_global_allow_read |
1038 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
1039 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
1040 | "%u\n%s%s%s\n", | |
1041 | domain->domainname->name, | |
1042 | domain->profile, quota_exceeded, | |
1043 | transition_failed, | |
1044 | ignore_global_allow_read); | |
1045 | if (!done) | |
9590837b | 1046 | break; |
9590837b KT |
1047 | head->read_step = 2; |
1048 | acl_loop: | |
1049 | if (head->read_step == 3) | |
1050 | goto tail_mark; | |
1051 | /* Print ACL entries in the domain. */ | |
9590837b | 1052 | list_for_each_cookie(apos, head->read_var2, |
7d2948b1 | 1053 | &domain->acl_info_list) { |
9590837b KT |
1054 | struct tomoyo_acl_info *ptr |
1055 | = list_entry(apos, struct tomoyo_acl_info, | |
7d2948b1 TH |
1056 | list); |
1057 | done = tomoyo_print_entry(head, ptr); | |
1058 | if (!done) | |
9590837b | 1059 | break; |
9590837b | 1060 | } |
9590837b KT |
1061 | if (!done) |
1062 | break; | |
1063 | head->read_step = 3; | |
1064 | tail_mark: | |
7d2948b1 TH |
1065 | done = tomoyo_io_printf(head, "\n"); |
1066 | if (!done) | |
9590837b | 1067 | break; |
9590837b KT |
1068 | head->read_step = 1; |
1069 | if (head->read_single_domain) | |
1070 | break; | |
1071 | } | |
9590837b KT |
1072 | head->read_eof = done; |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
1078 | * | |
1079 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1080 | * | |
1081 | * Returns 0 on success, -EINVAL otherwise. | |
1082 | * | |
1083 | * This is equivalent to doing | |
1084 | * | |
1085 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
9b244373 | 1086 | * /usr/sbin/tomoyo-loadpolicy -d |
fdb8ebb7 TH |
1087 | * |
1088 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1089 | */ |
1090 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1091 | { | |
1092 | char *data = head->write_buf; | |
1093 | char *cp = strchr(data, ' '); | |
1094 | struct tomoyo_domain_info *domain; | |
1095 | unsigned long profile; | |
1096 | ||
1097 | if (!cp) | |
1098 | return -EINVAL; | |
1099 | *cp = '\0'; | |
9590837b | 1100 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
1101 | if (strict_strtoul(data, 10, &profile)) |
1102 | return -EINVAL; | |
1103 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1104 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1105 | domain->profile = (u8) profile; | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | /** | |
1110 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1111 | * | |
1112 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1113 | * | |
1114 | * Returns list of profile number and domainname pairs. | |
1115 | * | |
1116 | * This is equivalent to doing | |
1117 | * | |
1118 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1119 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1120 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1121 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
1122 | * |
1123 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1124 | */ |
1125 | static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) | |
1126 | { | |
1127 | struct list_head *pos; | |
1128 | bool done = true; | |
1129 | ||
1130 | if (head->read_eof) | |
1131 | return 0; | |
9590837b KT |
1132 | list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { |
1133 | struct tomoyo_domain_info *domain; | |
1134 | domain = list_entry(pos, struct tomoyo_domain_info, list); | |
1135 | if (domain->is_deleted) | |
1136 | continue; | |
7d2948b1 TH |
1137 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
1138 | domain->domainname->name); | |
1139 | if (!done) | |
9590837b | 1140 | break; |
9590837b | 1141 | } |
9590837b KT |
1142 | head->read_eof = done; |
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | /** | |
1147 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1148 | * | |
1149 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1150 | * | |
1151 | * Returns 0. | |
1152 | */ | |
1153 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1154 | { | |
1155 | unsigned long pid; | |
1156 | /* No error check. */ | |
1157 | strict_strtoul(head->write_buf, 10, &pid); | |
1158 | head->read_step = (int) pid; | |
1159 | head->read_eof = false; | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1165 | * | |
1166 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1167 | * | |
1168 | * Returns the domainname which the specified PID is in on success, | |
1169 | * empty string otherwise. | |
1170 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1171 | * using read()/write() interface rather than sysctl() interface. | |
1172 | */ | |
1173 | static int tomoyo_read_pid(struct tomoyo_io_buffer *head) | |
1174 | { | |
1175 | if (head->read_avail == 0 && !head->read_eof) { | |
1176 | const int pid = head->read_step; | |
1177 | struct task_struct *p; | |
1178 | struct tomoyo_domain_info *domain = NULL; | |
1fcdc7c5 | 1179 | rcu_read_lock(); |
9590837b KT |
1180 | read_lock(&tasklist_lock); |
1181 | p = find_task_by_vpid(pid); | |
1182 | if (p) | |
1183 | domain = tomoyo_real_domain(p); | |
1184 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1185 | rcu_read_unlock(); |
9590837b KT |
1186 | if (domain) |
1187 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1188 | domain->domainname->name); | |
1189 | head->read_eof = true; | |
1190 | } | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | /** | |
1195 | * tomoyo_write_exception_policy - Write exception policy. | |
1196 | * | |
1197 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1198 | * | |
1199 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1200 | * |
1201 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1202 | */ |
1203 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1204 | { | |
1205 | char *data = head->write_buf; | |
1206 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1207 | ||
1208 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) | |
1209 | return tomoyo_write_domain_keeper_policy(data, false, | |
1210 | is_delete); | |
1211 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) | |
1212 | return tomoyo_write_domain_keeper_policy(data, true, is_delete); | |
1213 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) | |
1214 | return tomoyo_write_domain_initializer_policy(data, false, | |
1215 | is_delete); | |
1216 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) | |
1217 | return tomoyo_write_domain_initializer_policy(data, true, | |
1218 | is_delete); | |
1084307c TH |
1219 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) |
1220 | return tomoyo_write_aggregator_policy(data, is_delete); | |
9590837b KT |
1221 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) |
1222 | return tomoyo_write_alias_policy(data, is_delete); | |
1223 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) | |
1224 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1225 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1226 | return tomoyo_write_pattern_policy(data, is_delete); | |
1227 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1228 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
7762fbff TH |
1229 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) |
1230 | return tomoyo_write_path_group_policy(data, is_delete); | |
4c3e9e2d TH |
1231 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) |
1232 | return tomoyo_write_number_group_policy(data, is_delete); | |
9590837b KT |
1233 | return -EINVAL; |
1234 | } | |
1235 | ||
1236 | /** | |
1237 | * tomoyo_read_exception_policy - Read exception policy. | |
1238 | * | |
1239 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1240 | * | |
1241 | * Returns 0 on success, -EINVAL otherwise. | |
fdb8ebb7 TH |
1242 | * |
1243 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1244 | */ |
1245 | static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) | |
1246 | { | |
1247 | if (!head->read_eof) { | |
1248 | switch (head->read_step) { | |
1249 | case 0: | |
1250 | head->read_var2 = NULL; | |
1251 | head->read_step = 1; | |
1252 | case 1: | |
1253 | if (!tomoyo_read_domain_keeper_policy(head)) | |
1254 | break; | |
1255 | head->read_var2 = NULL; | |
1256 | head->read_step = 2; | |
1257 | case 2: | |
1258 | if (!tomoyo_read_globally_readable_policy(head)) | |
1259 | break; | |
1260 | head->read_var2 = NULL; | |
1261 | head->read_step = 3; | |
1262 | case 3: | |
1263 | head->read_var2 = NULL; | |
1264 | head->read_step = 4; | |
1265 | case 4: | |
1266 | if (!tomoyo_read_domain_initializer_policy(head)) | |
1267 | break; | |
1268 | head->read_var2 = NULL; | |
1269 | head->read_step = 5; | |
1270 | case 5: | |
1271 | if (!tomoyo_read_alias_policy(head)) | |
1272 | break; | |
1273 | head->read_var2 = NULL; | |
1274 | head->read_step = 6; | |
1275 | case 6: | |
1084307c TH |
1276 | if (!tomoyo_read_aggregator_policy(head)) |
1277 | break; | |
9590837b KT |
1278 | head->read_var2 = NULL; |
1279 | head->read_step = 7; | |
1280 | case 7: | |
1281 | if (!tomoyo_read_file_pattern(head)) | |
1282 | break; | |
1283 | head->read_var2 = NULL; | |
1284 | head->read_step = 8; | |
1285 | case 8: | |
1286 | if (!tomoyo_read_no_rewrite_policy(head)) | |
1287 | break; | |
1288 | head->read_var2 = NULL; | |
1289 | head->read_step = 9; | |
1290 | case 9: | |
7762fbff TH |
1291 | if (!tomoyo_read_path_group_policy(head)) |
1292 | break; | |
1293 | head->read_var1 = NULL; | |
1294 | head->read_var2 = NULL; | |
1295 | head->read_step = 10; | |
1296 | case 10: | |
4c3e9e2d TH |
1297 | if (!tomoyo_read_number_group_policy(head)) |
1298 | break; | |
1299 | head->read_var1 = NULL; | |
1300 | head->read_var2 = NULL; | |
1301 | head->read_step = 11; | |
1302 | case 11: | |
9590837b KT |
1303 | head->read_eof = true; |
1304 | break; | |
1305 | default: | |
1306 | return -EINVAL; | |
1307 | } | |
1308 | } | |
1309 | return 0; | |
1310 | } | |
1311 | ||
17fcfbd9 TH |
1312 | /** |
1313 | * tomoyo_print_header - Get header line of audit log. | |
1314 | * | |
1315 | * @r: Pointer to "struct tomoyo_request_info". | |
1316 | * | |
1317 | * Returns string representation. | |
1318 | * | |
1319 | * This function uses kmalloc(), so caller must kfree() if this function | |
1320 | * didn't return NULL. | |
1321 | */ | |
1322 | static char *tomoyo_print_header(struct tomoyo_request_info *r) | |
1323 | { | |
1324 | static const char *tomoyo_mode_4[4] = { | |
1325 | "disabled", "learning", "permissive", "enforcing" | |
1326 | }; | |
1327 | struct timeval tv; | |
1328 | const pid_t gpid = task_pid_nr(current); | |
1329 | static const int tomoyo_buffer_len = 4096; | |
1330 | char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); | |
1331 | if (!buffer) | |
1332 | return NULL; | |
1333 | do_gettimeofday(&tv); | |
1334 | snprintf(buffer, tomoyo_buffer_len - 1, | |
1335 | "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" | |
1336 | " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" | |
1337 | " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", | |
1338 | tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, | |
1339 | (pid_t) sys_getpid(), (pid_t) sys_getppid(), | |
1340 | current_uid(), current_gid(), current_euid(), | |
1341 | current_egid(), current_suid(), current_sgid(), | |
1342 | current_fsuid(), current_fsgid()); | |
1343 | return buffer; | |
1344 | } | |
1345 | ||
1346 | /** | |
1347 | * tomoyo_init_audit_log - Allocate buffer for audit logs. | |
1348 | * | |
1349 | * @len: Required size. | |
1350 | * @r: Pointer to "struct tomoyo_request_info". | |
1351 | * | |
1352 | * Returns pointer to allocated memory. | |
1353 | * | |
1354 | * The @len is updated to add the header lines' size on success. | |
1355 | * | |
1356 | * This function uses kzalloc(), so caller must kfree() if this function | |
1357 | * didn't return NULL. | |
1358 | */ | |
1359 | static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) | |
1360 | { | |
1361 | char *buf = NULL; | |
1362 | const char *header; | |
1363 | const char *domainname; | |
1364 | if (!r->domain) | |
1365 | r->domain = tomoyo_domain(); | |
1366 | domainname = r->domain->domainname->name; | |
1367 | header = tomoyo_print_header(r); | |
1368 | if (!header) | |
1369 | return NULL; | |
1370 | *len += strlen(domainname) + strlen(header) + 10; | |
1371 | buf = kzalloc(*len, GFP_NOFS); | |
1372 | if (buf) | |
1373 | snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); | |
1374 | kfree(header); | |
1375 | return buf; | |
1376 | } | |
1377 | ||
1378 | /* Wait queue for tomoyo_query_list. */ | |
1379 | static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); | |
1380 | ||
1381 | /* Lock for manipulating tomoyo_query_list. */ | |
1382 | static DEFINE_SPINLOCK(tomoyo_query_list_lock); | |
1383 | ||
1384 | /* Structure for query. */ | |
1385 | struct tomoyo_query_entry { | |
1386 | struct list_head list; | |
1387 | char *query; | |
1388 | int query_len; | |
1389 | unsigned int serial; | |
1390 | int timer; | |
1391 | int answer; | |
1392 | }; | |
1393 | ||
1394 | /* The list for "struct tomoyo_query_entry". */ | |
1395 | static LIST_HEAD(tomoyo_query_list); | |
1396 | ||
1397 | /* | |
1398 | * Number of "struct file" referring /sys/kernel/security/tomoyo/query | |
1399 | * interface. | |
1400 | */ | |
1401 | static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); | |
1402 | ||
1403 | /** | |
1404 | * tomoyo_supervisor - Ask for the supervisor's decision. | |
1405 | * | |
1406 | * @r: Pointer to "struct tomoyo_request_info". | |
1407 | * @fmt: The printf()'s format string, followed by parameters. | |
1408 | * | |
1409 | * Returns 0 if the supervisor decided to permit the access request which | |
1410 | * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the | |
1411 | * supervisor decided to retry the access request which violated the policy in | |
1412 | * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. | |
1413 | */ | |
1414 | int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) | |
1415 | { | |
1416 | va_list args; | |
1417 | int error = -EPERM; | |
1418 | int pos; | |
1419 | int len; | |
1420 | static unsigned int tomoyo_serial; | |
1421 | struct tomoyo_query_entry *tomoyo_query_entry = NULL; | |
1422 | bool quota_exceeded = false; | |
1423 | char *header; | |
1424 | switch (r->mode) { | |
1425 | char *buffer; | |
1426 | case TOMOYO_CONFIG_LEARNING: | |
1427 | if (!tomoyo_domain_quota_is_ok(r)) | |
1428 | return 0; | |
1429 | va_start(args, fmt); | |
1430 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; | |
1431 | va_end(args); | |
1432 | buffer = kmalloc(len, GFP_NOFS); | |
1433 | if (!buffer) | |
1434 | return 0; | |
1435 | va_start(args, fmt); | |
1436 | vsnprintf(buffer, len - 1, fmt, args); | |
1437 | va_end(args); | |
1438 | tomoyo_normalize_line(buffer); | |
1439 | tomoyo_write_domain_policy2(buffer, r->domain, false); | |
1440 | kfree(buffer); | |
1441 | /* fall through */ | |
1442 | case TOMOYO_CONFIG_PERMISSIVE: | |
1443 | return 0; | |
1444 | } | |
1445 | if (!r->domain) | |
1446 | r->domain = tomoyo_domain(); | |
1447 | if (!atomic_read(&tomoyo_query_observers)) | |
1448 | return -EPERM; | |
1449 | va_start(args, fmt); | |
1450 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; | |
1451 | va_end(args); | |
1452 | header = tomoyo_init_audit_log(&len, r); | |
1453 | if (!header) | |
1454 | goto out; | |
1455 | tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); | |
1456 | if (!tomoyo_query_entry) | |
1457 | goto out; | |
1458 | tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); | |
1459 | if (!tomoyo_query_entry->query) | |
1460 | goto out; | |
1461 | len = ksize(tomoyo_query_entry->query); | |
1462 | INIT_LIST_HEAD(&tomoyo_query_entry->list); | |
1463 | spin_lock(&tomoyo_query_list_lock); | |
1464 | if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + | |
1465 | sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { | |
1466 | quota_exceeded = true; | |
1467 | } else { | |
1468 | tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); | |
1469 | tomoyo_query_entry->serial = tomoyo_serial++; | |
1470 | } | |
1471 | spin_unlock(&tomoyo_query_list_lock); | |
1472 | if (quota_exceeded) | |
1473 | goto out; | |
1474 | pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", | |
1475 | tomoyo_query_entry->serial, r->retry, header); | |
1476 | kfree(header); | |
1477 | header = NULL; | |
1478 | va_start(args, fmt); | |
1479 | vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); | |
1480 | tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; | |
1481 | va_end(args); | |
1482 | spin_lock(&tomoyo_query_list_lock); | |
1483 | list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); | |
1484 | spin_unlock(&tomoyo_query_list_lock); | |
1485 | /* Give 10 seconds for supervisor's opinion. */ | |
1486 | for (tomoyo_query_entry->timer = 0; | |
1487 | atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; | |
1488 | tomoyo_query_entry->timer++) { | |
1489 | wake_up(&tomoyo_query_wait); | |
1490 | set_current_state(TASK_INTERRUPTIBLE); | |
1491 | schedule_timeout(HZ / 10); | |
1492 | if (tomoyo_query_entry->answer) | |
1493 | break; | |
1494 | } | |
1495 | spin_lock(&tomoyo_query_list_lock); | |
1496 | list_del(&tomoyo_query_entry->list); | |
1497 | tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); | |
1498 | spin_unlock(&tomoyo_query_list_lock); | |
1499 | switch (tomoyo_query_entry->answer) { | |
1500 | case 3: /* Asked to retry by administrator. */ | |
1501 | error = TOMOYO_RETRY_REQUEST; | |
1502 | r->retry++; | |
1503 | break; | |
1504 | case 1: | |
1505 | /* Granted by administrator. */ | |
1506 | error = 0; | |
1507 | break; | |
1508 | case 0: | |
1509 | /* Timed out. */ | |
1510 | break; | |
1511 | default: | |
1512 | /* Rejected by administrator. */ | |
1513 | break; | |
1514 | } | |
1515 | out: | |
1516 | if (tomoyo_query_entry) | |
1517 | kfree(tomoyo_query_entry->query); | |
1518 | kfree(tomoyo_query_entry); | |
1519 | kfree(header); | |
1520 | return error; | |
1521 | } | |
1522 | ||
1523 | /** | |
1524 | * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. | |
1525 | * | |
1526 | * @file: Pointer to "struct file". | |
1527 | * @wait: Pointer to "poll_table". | |
1528 | * | |
1529 | * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. | |
1530 | * | |
1531 | * Waits for access requests which violated policy in enforcing mode. | |
1532 | */ | |
1533 | static int tomoyo_poll_query(struct file *file, poll_table *wait) | |
1534 | { | |
1535 | struct list_head *tmp; | |
1536 | bool found = false; | |
1537 | u8 i; | |
1538 | for (i = 0; i < 2; i++) { | |
1539 | spin_lock(&tomoyo_query_list_lock); | |
1540 | list_for_each(tmp, &tomoyo_query_list) { | |
1541 | struct tomoyo_query_entry *ptr | |
1542 | = list_entry(tmp, struct tomoyo_query_entry, | |
1543 | list); | |
1544 | if (ptr->answer) | |
1545 | continue; | |
1546 | found = true; | |
1547 | break; | |
1548 | } | |
1549 | spin_unlock(&tomoyo_query_list_lock); | |
1550 | if (found) | |
1551 | return POLLIN | POLLRDNORM; | |
1552 | if (i) | |
1553 | break; | |
1554 | poll_wait(file, &tomoyo_query_wait, wait); | |
1555 | } | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /** | |
1560 | * tomoyo_read_query - Read access requests which violated policy in enforcing mode. | |
1561 | * | |
1562 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1563 | * | |
1564 | * Returns 0. | |
1565 | */ | |
1566 | static int tomoyo_read_query(struct tomoyo_io_buffer *head) | |
1567 | { | |
1568 | struct list_head *tmp; | |
1569 | int pos = 0; | |
1570 | int len = 0; | |
1571 | char *buf; | |
1572 | if (head->read_avail) | |
1573 | return 0; | |
1574 | if (head->read_buf) { | |
1575 | kfree(head->read_buf); | |
1576 | head->read_buf = NULL; | |
1577 | head->readbuf_size = 0; | |
1578 | } | |
1579 | spin_lock(&tomoyo_query_list_lock); | |
1580 | list_for_each(tmp, &tomoyo_query_list) { | |
1581 | struct tomoyo_query_entry *ptr | |
1582 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1583 | if (ptr->answer) | |
1584 | continue; | |
1585 | if (pos++ != head->read_step) | |
1586 | continue; | |
1587 | len = ptr->query_len; | |
1588 | break; | |
1589 | } | |
1590 | spin_unlock(&tomoyo_query_list_lock); | |
1591 | if (!len) { | |
1592 | head->read_step = 0; | |
1593 | return 0; | |
1594 | } | |
1595 | buf = kzalloc(len, GFP_NOFS); | |
1596 | if (!buf) | |
1597 | return 0; | |
1598 | pos = 0; | |
1599 | spin_lock(&tomoyo_query_list_lock); | |
1600 | list_for_each(tmp, &tomoyo_query_list) { | |
1601 | struct tomoyo_query_entry *ptr | |
1602 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1603 | if (ptr->answer) | |
1604 | continue; | |
1605 | if (pos++ != head->read_step) | |
1606 | continue; | |
1607 | /* | |
1608 | * Some query can be skipped because tomoyo_query_list | |
1609 | * can change, but I don't care. | |
1610 | */ | |
1611 | if (len == ptr->query_len) | |
1612 | memmove(buf, ptr->query, len); | |
1613 | break; | |
1614 | } | |
1615 | spin_unlock(&tomoyo_query_list_lock); | |
1616 | if (buf[0]) { | |
1617 | head->read_avail = len; | |
1618 | head->readbuf_size = head->read_avail; | |
1619 | head->read_buf = buf; | |
1620 | head->read_step++; | |
1621 | } else { | |
1622 | kfree(buf); | |
1623 | } | |
1624 | return 0; | |
1625 | } | |
1626 | ||
1627 | /** | |
1628 | * tomoyo_write_answer - Write the supervisor's decision. | |
1629 | * | |
1630 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1631 | * | |
1632 | * Returns 0 on success, -EINVAL otherwise. | |
1633 | */ | |
1634 | static int tomoyo_write_answer(struct tomoyo_io_buffer *head) | |
1635 | { | |
1636 | char *data = head->write_buf; | |
1637 | struct list_head *tmp; | |
1638 | unsigned int serial; | |
1639 | unsigned int answer; | |
1640 | spin_lock(&tomoyo_query_list_lock); | |
1641 | list_for_each(tmp, &tomoyo_query_list) { | |
1642 | struct tomoyo_query_entry *ptr | |
1643 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1644 | ptr->timer = 0; | |
1645 | } | |
1646 | spin_unlock(&tomoyo_query_list_lock); | |
1647 | if (sscanf(data, "A%u=%u", &serial, &answer) != 2) | |
1648 | return -EINVAL; | |
1649 | spin_lock(&tomoyo_query_list_lock); | |
1650 | list_for_each(tmp, &tomoyo_query_list) { | |
1651 | struct tomoyo_query_entry *ptr | |
1652 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1653 | if (ptr->serial != serial) | |
1654 | continue; | |
1655 | if (!ptr->answer) | |
1656 | ptr->answer = answer; | |
1657 | break; | |
1658 | } | |
1659 | spin_unlock(&tomoyo_query_list_lock); | |
1660 | return 0; | |
1661 | } | |
1662 | ||
9590837b KT |
1663 | /** |
1664 | * tomoyo_read_version: Get version. | |
1665 | * | |
1666 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1667 | * | |
1668 | * Returns version information. | |
1669 | */ | |
1670 | static int tomoyo_read_version(struct tomoyo_io_buffer *head) | |
1671 | { | |
1672 | if (!head->read_eof) { | |
57c2590f | 1673 | tomoyo_io_printf(head, "2.3.0-pre"); |
9590837b KT |
1674 | head->read_eof = true; |
1675 | } | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | /** | |
1680 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1681 | * | |
1682 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1683 | * | |
1684 | * Returns the current process's domainname. | |
1685 | */ | |
1686 | static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head) | |
1687 | { | |
1688 | if (!head->read_eof) { | |
1689 | /* | |
1690 | * tomoyo_domain()->domainname != NULL | |
1691 | * because every process belongs to a domain and | |
1692 | * the domain's name cannot be NULL. | |
1693 | */ | |
1694 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1695 | head->read_eof = true; | |
1696 | } | |
1697 | return 0; | |
1698 | } | |
1699 | ||
1700 | /** | |
1701 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1702 | * | |
1703 | * @type: Type of interface. | |
1704 | * @file: Pointer to "struct file". | |
1705 | * | |
1706 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1707 | * |
1708 | * Caller acquires tomoyo_read_lock(). | |
9590837b | 1709 | */ |
c3ef1500 | 1710 | int tomoyo_open_control(const u8 type, struct file *file) |
9590837b | 1711 | { |
4e5d6f7e | 1712 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1713 | |
1714 | if (!head) | |
1715 | return -ENOMEM; | |
1716 | mutex_init(&head->io_sem); | |
17fcfbd9 | 1717 | head->type = type; |
9590837b KT |
1718 | switch (type) { |
1719 | case TOMOYO_DOMAINPOLICY: | |
1720 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1721 | head->write = tomoyo_write_domain_policy; | |
1722 | head->read = tomoyo_read_domain_policy; | |
1723 | break; | |
1724 | case TOMOYO_EXCEPTIONPOLICY: | |
1725 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1726 | head->write = tomoyo_write_exception_policy; | |
1727 | head->read = tomoyo_read_exception_policy; | |
1728 | break; | |
1729 | case TOMOYO_SELFDOMAIN: | |
1730 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1731 | head->read = tomoyo_read_self_domain; | |
1732 | break; | |
1733 | case TOMOYO_DOMAIN_STATUS: | |
1734 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1735 | head->write = tomoyo_write_domain_profile; | |
1736 | head->read = tomoyo_read_domain_profile; | |
1737 | break; | |
1738 | case TOMOYO_PROCESS_STATUS: | |
1739 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1740 | head->write = tomoyo_write_pid; | |
1741 | head->read = tomoyo_read_pid; | |
1742 | break; | |
1743 | case TOMOYO_VERSION: | |
1744 | /* /sys/kernel/security/tomoyo/version */ | |
1745 | head->read = tomoyo_read_version; | |
1746 | head->readbuf_size = 128; | |
1747 | break; | |
1748 | case TOMOYO_MEMINFO: | |
1749 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1750 | head->write = tomoyo_write_memory_quota; | |
1751 | head->read = tomoyo_read_memory_counter; | |
1752 | head->readbuf_size = 512; | |
1753 | break; | |
1754 | case TOMOYO_PROFILE: | |
1755 | /* /sys/kernel/security/tomoyo/profile */ | |
1756 | head->write = tomoyo_write_profile; | |
1757 | head->read = tomoyo_read_profile; | |
1758 | break; | |
17fcfbd9 TH |
1759 | case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
1760 | head->poll = tomoyo_poll_query; | |
1761 | head->write = tomoyo_write_answer; | |
1762 | head->read = tomoyo_read_query; | |
1763 | break; | |
9590837b KT |
1764 | case TOMOYO_MANAGER: |
1765 | /* /sys/kernel/security/tomoyo/manager */ | |
1766 | head->write = tomoyo_write_manager_policy; | |
1767 | head->read = tomoyo_read_manager_policy; | |
1768 | break; | |
1769 | } | |
1770 | if (!(file->f_mode & FMODE_READ)) { | |
1771 | /* | |
1772 | * No need to allocate read_buf since it is not opened | |
1773 | * for reading. | |
1774 | */ | |
1775 | head->read = NULL; | |
17fcfbd9 TH |
1776 | head->poll = NULL; |
1777 | } else if (!head->poll) { | |
1778 | /* Don't allocate read_buf for poll() access. */ | |
9590837b KT |
1779 | if (!head->readbuf_size) |
1780 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 1781 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 1782 | if (!head->read_buf) { |
8e2d39a1 | 1783 | kfree(head); |
9590837b KT |
1784 | return -ENOMEM; |
1785 | } | |
1786 | } | |
1787 | if (!(file->f_mode & FMODE_WRITE)) { | |
1788 | /* | |
1789 | * No need to allocate write_buf since it is not opened | |
1790 | * for writing. | |
1791 | */ | |
1792 | head->write = NULL; | |
1793 | } else if (head->write) { | |
1794 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 1795 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 1796 | if (!head->write_buf) { |
8e2d39a1 TH |
1797 | kfree(head->read_buf); |
1798 | kfree(head); | |
9590837b KT |
1799 | return -ENOMEM; |
1800 | } | |
1801 | } | |
17fcfbd9 TH |
1802 | if (type != TOMOYO_QUERY) |
1803 | head->reader_idx = tomoyo_read_lock(); | |
9590837b KT |
1804 | file->private_data = head; |
1805 | /* | |
1806 | * Call the handler now if the file is | |
1807 | * /sys/kernel/security/tomoyo/self_domain | |
1808 | * so that the user can use | |
1809 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1810 | * to know the current process's domainname. | |
1811 | */ | |
1812 | if (type == TOMOYO_SELFDOMAIN) | |
1813 | tomoyo_read_control(file, NULL, 0); | |
17fcfbd9 TH |
1814 | /* |
1815 | * If the file is /sys/kernel/security/tomoyo/query , increment the | |
1816 | * observer counter. | |
1817 | * The obserber counter is used by tomoyo_supervisor() to see if | |
1818 | * there is some process monitoring /sys/kernel/security/tomoyo/query. | |
1819 | */ | |
1820 | else if (type == TOMOYO_QUERY) | |
1821 | atomic_inc(&tomoyo_query_observers); | |
9590837b KT |
1822 | return 0; |
1823 | } | |
1824 | ||
17fcfbd9 TH |
1825 | /** |
1826 | * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. | |
1827 | * | |
1828 | * @file: Pointer to "struct file". | |
1829 | * @wait: Pointer to "poll_table". | |
1830 | * | |
1831 | * Waits for read readiness. | |
1832 | * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . | |
1833 | */ | |
1834 | int tomoyo_poll_control(struct file *file, poll_table *wait) | |
1835 | { | |
1836 | struct tomoyo_io_buffer *head = file->private_data; | |
1837 | if (!head->poll) | |
1838 | return -ENOSYS; | |
1839 | return head->poll(file, wait); | |
1840 | } | |
1841 | ||
9590837b KT |
1842 | /** |
1843 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1844 | * | |
1845 | * @file: Pointer to "struct file". | |
1846 | * @buffer: Poiner to buffer to write to. | |
1847 | * @buffer_len: Size of @buffer. | |
1848 | * | |
1849 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
1850 | * |
1851 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1852 | */ |
c3ef1500 TH |
1853 | int tomoyo_read_control(struct file *file, char __user *buffer, |
1854 | const int buffer_len) | |
9590837b KT |
1855 | { |
1856 | int len = 0; | |
1857 | struct tomoyo_io_buffer *head = file->private_data; | |
1858 | char *cp; | |
1859 | ||
1860 | if (!head->read) | |
1861 | return -ENOSYS; | |
1862 | if (mutex_lock_interruptible(&head->io_sem)) | |
1863 | return -EINTR; | |
1864 | /* Call the policy handler. */ | |
1865 | len = head->read(head); | |
1866 | if (len < 0) | |
1867 | goto out; | |
1868 | /* Write to buffer. */ | |
1869 | len = head->read_avail; | |
1870 | if (len > buffer_len) | |
1871 | len = buffer_len; | |
1872 | if (!len) | |
1873 | goto out; | |
1874 | /* head->read_buf changes by some functions. */ | |
1875 | cp = head->read_buf; | |
1876 | if (copy_to_user(buffer, cp, len)) { | |
1877 | len = -EFAULT; | |
1878 | goto out; | |
1879 | } | |
1880 | head->read_avail -= len; | |
1881 | memmove(cp, cp + len, head->read_avail); | |
1882 | out: | |
1883 | mutex_unlock(&head->io_sem); | |
1884 | return len; | |
1885 | } | |
1886 | ||
1887 | /** | |
1888 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
1889 | * | |
1890 | * @file: Pointer to "struct file". | |
1891 | * @buffer: Pointer to buffer to read from. | |
1892 | * @buffer_len: Size of @buffer. | |
1893 | * | |
1894 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
1895 | * |
1896 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1897 | */ |
c3ef1500 TH |
1898 | int tomoyo_write_control(struct file *file, const char __user *buffer, |
1899 | const int buffer_len) | |
9590837b KT |
1900 | { |
1901 | struct tomoyo_io_buffer *head = file->private_data; | |
1902 | int error = buffer_len; | |
1903 | int avail_len = buffer_len; | |
1904 | char *cp0 = head->write_buf; | |
1905 | ||
1906 | if (!head->write) | |
1907 | return -ENOSYS; | |
1908 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
1909 | return -EFAULT; | |
1910 | /* Don't allow updating policies by non manager programs. */ | |
1911 | if (head->write != tomoyo_write_pid && | |
1912 | head->write != tomoyo_write_domain_policy && | |
1913 | !tomoyo_is_policy_manager()) | |
1914 | return -EPERM; | |
1915 | if (mutex_lock_interruptible(&head->io_sem)) | |
1916 | return -EINTR; | |
1917 | /* Read a line and dispatch it to the policy handler. */ | |
1918 | while (avail_len > 0) { | |
1919 | char c; | |
1920 | if (head->write_avail >= head->writebuf_size - 1) { | |
1921 | error = -ENOMEM; | |
1922 | break; | |
1923 | } else if (get_user(c, buffer)) { | |
1924 | error = -EFAULT; | |
1925 | break; | |
1926 | } | |
1927 | buffer++; | |
1928 | avail_len--; | |
1929 | cp0[head->write_avail++] = c; | |
1930 | if (c != '\n') | |
1931 | continue; | |
1932 | cp0[head->write_avail - 1] = '\0'; | |
1933 | head->write_avail = 0; | |
1934 | tomoyo_normalize_line(cp0); | |
1935 | head->write(head); | |
1936 | } | |
1937 | mutex_unlock(&head->io_sem); | |
1938 | return error; | |
1939 | } | |
1940 | ||
1941 | /** | |
1942 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
1943 | * | |
1944 | * @file: Pointer to "struct file". | |
1945 | * | |
1946 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
1947 | * |
1948 | * Caller looses tomoyo_read_lock(). | |
9590837b | 1949 | */ |
c3ef1500 | 1950 | int tomoyo_close_control(struct file *file) |
9590837b KT |
1951 | { |
1952 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 1953 | const bool is_write = !!head->write_buf; |
9590837b | 1954 | |
17fcfbd9 TH |
1955 | /* |
1956 | * If the file is /sys/kernel/security/tomoyo/query , decrement the | |
1957 | * observer counter. | |
1958 | */ | |
1959 | if (head->type == TOMOYO_QUERY) | |
1960 | atomic_dec(&tomoyo_query_observers); | |
1961 | else | |
1962 | tomoyo_read_unlock(head->reader_idx); | |
9590837b | 1963 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 1964 | kfree(head->read_buf); |
9590837b | 1965 | head->read_buf = NULL; |
8e2d39a1 | 1966 | kfree(head->write_buf); |
9590837b | 1967 | head->write_buf = NULL; |
8e2d39a1 | 1968 | kfree(head); |
9590837b KT |
1969 | head = NULL; |
1970 | file->private_data = NULL; | |
847b173e TH |
1971 | if (is_write) |
1972 | tomoyo_run_gc(); | |
9590837b KT |
1973 | return 0; |
1974 | } | |
1975 | ||
9590837b | 1976 | /** |
c3ef1500 | 1977 | * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
9590837b | 1978 | */ |
c3ef1500 | 1979 | void tomoyo_check_profile(void) |
9590837b | 1980 | { |
c3ef1500 TH |
1981 | struct tomoyo_domain_info *domain; |
1982 | const int idx = tomoyo_read_lock(); | |
1983 | tomoyo_policy_loaded = true; | |
1984 | /* Check all profiles currently assigned to domains are defined. */ | |
1985 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
1986 | const u8 profile = domain->profile; | |
1987 | if (tomoyo_profile_ptr[profile]) | |
1988 | continue; | |
1989 | panic("Profile %u (used by '%s') not defined.\n", | |
1990 | profile, domain->domainname->name); | |
1991 | } | |
1992 | tomoyo_read_unlock(idx); | |
57c2590f TH |
1993 | if (tomoyo_profile_version != 20090903) |
1994 | panic("Profile version %u is not supported.\n", | |
1995 | tomoyo_profile_version); | |
1996 | printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); | |
c3ef1500 | 1997 | printk(KERN_INFO "Mandatory Access Control activated.\n"); |
9590837b | 1998 | } |