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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 | ||
c3fa109a TH |
437 | /* |
438 | * tomoyo_policy_manager_list is used for holding list of domainnames or | |
439 | * programs which are permitted to modify configuration via | |
440 | * /sys/kernel/security/tomoyo/ interface. | |
441 | * | |
442 | * An entry is added by | |
443 | * | |
444 | * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
445 | * /sys/kernel/security/tomoyo/manager | |
446 | * (if you want to specify by a domainname) | |
447 | * | |
448 | * or | |
449 | * | |
9b244373 | 450 | * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager |
c3fa109a TH |
451 | * (if you want to specify by a program's location) |
452 | * | |
453 | * and is deleted by | |
454 | * | |
455 | * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \ | |
456 | * /sys/kernel/security/tomoyo/manager | |
457 | * | |
458 | * or | |
459 | * | |
9b244373 | 460 | * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \ |
c3fa109a TH |
461 | * /sys/kernel/security/tomoyo/manager |
462 | * | |
463 | * and all entries are retrieved by | |
464 | * | |
465 | * # cat /sys/kernel/security/tomoyo/manager | |
466 | */ | |
847b173e | 467 | LIST_HEAD(tomoyo_policy_manager_list); |
9590837b | 468 | |
36f5e1ff TH |
469 | static bool tomoyo_same_manager_entry(const struct tomoyo_acl_head *a, |
470 | const struct tomoyo_acl_head *b) | |
471 | { | |
472 | return container_of(a, struct tomoyo_policy_manager_entry, head) | |
473 | ->manager == | |
474 | container_of(b, struct tomoyo_policy_manager_entry, head) | |
475 | ->manager; | |
476 | } | |
477 | ||
9590837b KT |
478 | /** |
479 | * tomoyo_update_manager_entry - Add a manager entry. | |
480 | * | |
481 | * @manager: The path to manager or the domainnamme. | |
482 | * @is_delete: True if it is a delete request. | |
483 | * | |
484 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
485 | * |
486 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
487 | */ |
488 | static int tomoyo_update_manager_entry(const char *manager, | |
489 | const bool is_delete) | |
490 | { | |
9e4b50e9 | 491 | struct tomoyo_policy_manager_entry e = { }; |
36f5e1ff | 492 | int error; |
9590837b | 493 | |
75093152 TH |
494 | if (tomoyo_domain_def(manager)) { |
495 | if (!tomoyo_correct_domain(manager)) | |
9590837b | 496 | return -EINVAL; |
9e4b50e9 | 497 | e.is_domain = true; |
9590837b | 498 | } else { |
75093152 | 499 | if (!tomoyo_correct_path(manager)) |
9590837b KT |
500 | return -EINVAL; |
501 | } | |
9e4b50e9 TH |
502 | e.manager = tomoyo_get_name(manager); |
503 | if (!e.manager) | |
9590837b | 504 | return -ENOMEM; |
36f5e1ff TH |
505 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
506 | &tomoyo_policy_manager_list, | |
507 | tomoyo_same_manager_entry); | |
9e4b50e9 | 508 | tomoyo_put_name(e.manager); |
9590837b KT |
509 | return error; |
510 | } | |
511 | ||
512 | /** | |
513 | * tomoyo_write_manager_policy - Write manager policy. | |
514 | * | |
515 | * @head: Pointer to "struct tomoyo_io_buffer". | |
516 | * | |
517 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
518 | * |
519 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
520 | */ |
521 | static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head) | |
522 | { | |
523 | char *data = head->write_buf; | |
524 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
525 | ||
526 | if (!strcmp(data, "manage_by_non_root")) { | |
527 | tomoyo_manage_by_non_root = !is_delete; | |
528 | return 0; | |
529 | } | |
530 | return tomoyo_update_manager_entry(data, is_delete); | |
531 | } | |
532 | ||
533 | /** | |
534 | * tomoyo_read_manager_policy - Read manager policy. | |
535 | * | |
536 | * @head: Pointer to "struct tomoyo_io_buffer". | |
537 | * | |
fdb8ebb7 | 538 | * Caller holds tomoyo_read_lock(). |
9590837b | 539 | */ |
8fbe71f0 | 540 | static void tomoyo_read_manager_policy(struct tomoyo_io_buffer *head) |
9590837b KT |
541 | { |
542 | struct list_head *pos; | |
543 | bool done = true; | |
544 | ||
545 | if (head->read_eof) | |
8fbe71f0 | 546 | return; |
9590837b KT |
547 | list_for_each_cookie(pos, head->read_var2, |
548 | &tomoyo_policy_manager_list) { | |
549 | struct tomoyo_policy_manager_entry *ptr; | |
550 | ptr = list_entry(pos, struct tomoyo_policy_manager_entry, | |
82e0f001 TH |
551 | head.list); |
552 | if (ptr->head.is_deleted) | |
9590837b | 553 | continue; |
7d2948b1 TH |
554 | done = tomoyo_io_printf(head, "%s\n", ptr->manager->name); |
555 | if (!done) | |
9590837b | 556 | break; |
9590837b | 557 | } |
9590837b | 558 | head->read_eof = done; |
9590837b KT |
559 | } |
560 | ||
561 | /** | |
75093152 | 562 | * tomoyo_policy_manager - Check whether the current process is a policy manager. |
9590837b KT |
563 | * |
564 | * Returns true if the current process is permitted to modify policy | |
565 | * via /sys/kernel/security/tomoyo/ interface. | |
fdb8ebb7 TH |
566 | * |
567 | * Caller holds tomoyo_read_lock(). | |
9590837b | 568 | */ |
75093152 | 569 | static bool tomoyo_policy_manager(void) |
9590837b KT |
570 | { |
571 | struct tomoyo_policy_manager_entry *ptr; | |
572 | const char *exe; | |
573 | const struct task_struct *task = current; | |
574 | const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname; | |
575 | bool found = false; | |
576 | ||
577 | if (!tomoyo_policy_loaded) | |
578 | return true; | |
579 | if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid)) | |
580 | return false; | |
82e0f001 TH |
581 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) { |
582 | if (!ptr->head.is_deleted && ptr->is_domain | |
9590837b KT |
583 | && !tomoyo_pathcmp(domainname, ptr->manager)) { |
584 | found = true; | |
585 | break; | |
586 | } | |
587 | } | |
9590837b KT |
588 | if (found) |
589 | return true; | |
590 | exe = tomoyo_get_exe(); | |
591 | if (!exe) | |
592 | return false; | |
82e0f001 TH |
593 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) { |
594 | if (!ptr->head.is_deleted && !ptr->is_domain | |
9590837b KT |
595 | && !strcmp(exe, ptr->manager->name)) { |
596 | found = true; | |
597 | break; | |
598 | } | |
599 | } | |
9590837b KT |
600 | if (!found) { /* Reduce error messages. */ |
601 | static pid_t last_pid; | |
602 | const pid_t pid = current->pid; | |
603 | if (last_pid != pid) { | |
604 | printk(KERN_WARNING "%s ( %s ) is not permitted to " | |
605 | "update policies.\n", domainname->name, exe); | |
606 | last_pid = pid; | |
607 | } | |
608 | } | |
8e2d39a1 | 609 | kfree(exe); |
9590837b KT |
610 | return found; |
611 | } | |
612 | ||
613 | /** | |
75093152 | 614 | * tomoyo_select_one - Parse select command. |
9590837b KT |
615 | * |
616 | * @head: Pointer to "struct tomoyo_io_buffer". | |
617 | * @data: String to parse. | |
618 | * | |
619 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
620 | * |
621 | * Caller holds tomoyo_read_lock(). | |
9590837b | 622 | */ |
75093152 | 623 | static bool tomoyo_select_one(struct tomoyo_io_buffer *head, |
9590837b KT |
624 | const char *data) |
625 | { | |
626 | unsigned int pid; | |
627 | struct tomoyo_domain_info *domain = NULL; | |
9b244373 | 628 | bool global_pid = false; |
9590837b | 629 | |
9b244373 TH |
630 | if (sscanf(data, "pid=%u", &pid) == 1 || |
631 | (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { | |
9590837b | 632 | struct task_struct *p; |
1fcdc7c5 | 633 | rcu_read_lock(); |
9590837b | 634 | read_lock(&tasklist_lock); |
9b244373 TH |
635 | if (global_pid) |
636 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
637 | else | |
638 | p = find_task_by_vpid(pid); | |
9590837b KT |
639 | if (p) |
640 | domain = tomoyo_real_domain(p); | |
641 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 642 | rcu_read_unlock(); |
9590837b | 643 | } else if (!strncmp(data, "domain=", 7)) { |
75093152 | 644 | if (tomoyo_domain_def(data + 7)) |
9590837b | 645 | domain = tomoyo_find_domain(data + 7); |
9590837b KT |
646 | } else |
647 | return false; | |
648 | head->write_var1 = domain; | |
649 | /* Accessing read_buf is safe because head->io_sem is held. */ | |
650 | if (!head->read_buf) | |
651 | return true; /* Do nothing if open(O_WRONLY). */ | |
652 | head->read_avail = 0; | |
653 | tomoyo_io_printf(head, "# select %s\n", data); | |
654 | head->read_single_domain = true; | |
655 | head->read_eof = !domain; | |
656 | if (domain) { | |
657 | struct tomoyo_domain_info *d; | |
658 | head->read_var1 = NULL; | |
fdb8ebb7 | 659 | list_for_each_entry_rcu(d, &tomoyo_domain_list, list) { |
9590837b KT |
660 | if (d == domain) |
661 | break; | |
662 | head->read_var1 = &d->list; | |
663 | } | |
9590837b KT |
664 | head->read_var2 = NULL; |
665 | head->read_bit = 0; | |
666 | head->read_step = 0; | |
667 | if (domain->is_deleted) | |
668 | tomoyo_io_printf(head, "# This is a deleted domain.\n"); | |
669 | } | |
670 | return true; | |
671 | } | |
672 | ||
ccf135f5 TH |
673 | /** |
674 | * tomoyo_delete_domain - Delete a domain. | |
675 | * | |
676 | * @domainname: The name of domain. | |
677 | * | |
678 | * Returns 0. | |
fdb8ebb7 TH |
679 | * |
680 | * Caller holds tomoyo_read_lock(). | |
ccf135f5 TH |
681 | */ |
682 | static int tomoyo_delete_domain(char *domainname) | |
683 | { | |
684 | struct tomoyo_domain_info *domain; | |
685 | struct tomoyo_path_info name; | |
686 | ||
687 | name.name = domainname; | |
688 | tomoyo_fill_path_info(&name); | |
29282381 TH |
689 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
690 | return 0; | |
ccf135f5 | 691 | /* Is there an active domain? */ |
fdb8ebb7 | 692 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
ccf135f5 TH |
693 | /* Never delete tomoyo_kernel_domain */ |
694 | if (domain == &tomoyo_kernel_domain) | |
695 | continue; | |
696 | if (domain->is_deleted || | |
697 | tomoyo_pathcmp(domain->domainname, &name)) | |
698 | continue; | |
699 | domain->is_deleted = true; | |
700 | break; | |
701 | } | |
f737d95d | 702 | mutex_unlock(&tomoyo_policy_lock); |
ccf135f5 TH |
703 | return 0; |
704 | } | |
705 | ||
17fcfbd9 TH |
706 | /** |
707 | * tomoyo_write_domain_policy2 - Write domain policy. | |
708 | * | |
709 | * @head: Pointer to "struct tomoyo_io_buffer". | |
710 | * | |
711 | * Returns 0 on success, negative value otherwise. | |
712 | * | |
713 | * Caller holds tomoyo_read_lock(). | |
714 | */ | |
715 | static int tomoyo_write_domain_policy2(char *data, | |
716 | struct tomoyo_domain_info *domain, | |
717 | const bool is_delete) | |
718 | { | |
719 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT)) | |
720 | return tomoyo_write_mount_policy(data, domain, is_delete); | |
721 | return tomoyo_write_file_policy(data, domain, is_delete); | |
722 | } | |
723 | ||
9590837b KT |
724 | /** |
725 | * tomoyo_write_domain_policy - Write domain policy. | |
726 | * | |
727 | * @head: Pointer to "struct tomoyo_io_buffer". | |
728 | * | |
729 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
730 | * |
731 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
732 | */ |
733 | static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head) | |
734 | { | |
735 | char *data = head->write_buf; | |
736 | struct tomoyo_domain_info *domain = head->write_var1; | |
737 | bool is_delete = false; | |
738 | bool is_select = false; | |
9590837b KT |
739 | unsigned int profile; |
740 | ||
741 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE)) | |
742 | is_delete = true; | |
743 | else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT)) | |
744 | is_select = true; | |
75093152 | 745 | if (is_select && tomoyo_select_one(head, data)) |
9590837b KT |
746 | return 0; |
747 | /* Don't allow updating policies by non manager programs. */ | |
75093152 | 748 | if (!tomoyo_policy_manager()) |
9590837b | 749 | return -EPERM; |
75093152 | 750 | if (tomoyo_domain_def(data)) { |
9590837b KT |
751 | domain = NULL; |
752 | if (is_delete) | |
753 | tomoyo_delete_domain(data); | |
fdb8ebb7 | 754 | else if (is_select) |
9590837b | 755 | domain = tomoyo_find_domain(data); |
fdb8ebb7 | 756 | else |
9590837b KT |
757 | domain = tomoyo_find_or_assign_new_domain(data, 0); |
758 | head->write_var1 = domain; | |
759 | return 0; | |
760 | } | |
761 | if (!domain) | |
762 | return -EINVAL; | |
763 | ||
764 | if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1 | |
765 | && profile < TOMOYO_MAX_PROFILES) { | |
766 | if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded) | |
767 | domain->profile = (u8) profile; | |
768 | return 0; | |
769 | } | |
770 | if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) { | |
ea13ddba | 771 | domain->ignore_global_allow_read = !is_delete; |
9590837b KT |
772 | return 0; |
773 | } | |
9b244373 TH |
774 | if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) { |
775 | domain->quota_warned = !is_delete; | |
776 | return 0; | |
777 | } | |
778 | if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) { | |
779 | domain->transition_failed = !is_delete; | |
780 | return 0; | |
781 | } | |
17fcfbd9 | 782 | return tomoyo_write_domain_policy2(data, domain, is_delete); |
9590837b KT |
783 | } |
784 | ||
785 | /** | |
7ef61233 | 786 | * tomoyo_print_path_acl - Print a single path ACL entry. |
9590837b KT |
787 | * |
788 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 789 | * @ptr: Pointer to "struct tomoyo_path_acl". |
9590837b KT |
790 | * |
791 | * Returns true on success, false otherwise. | |
792 | */ | |
7ef61233 TH |
793 | static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head, |
794 | struct tomoyo_path_acl *ptr) | |
9590837b KT |
795 | { |
796 | int pos; | |
797 | u8 bit; | |
a1f9bb6a | 798 | const u16 perm = ptr->perm; |
9590837b | 799 | |
7ef61233 | 800 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { |
9590837b KT |
801 | if (!(perm & (1 << bit))) |
802 | continue; | |
803 | /* Print "read/write" instead of "read" and "write". */ | |
7ef61233 TH |
804 | if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE) |
805 | && (perm & (1 << TOMOYO_TYPE_READ_WRITE))) | |
9590837b | 806 | continue; |
9590837b | 807 | pos = head->read_avail; |
7762fbff | 808 | if (!tomoyo_io_printf(head, "allow_%s ", |
71c28236 | 809 | tomoyo_path_keyword[bit]) || |
7762fbff TH |
810 | !tomoyo_print_name_union(head, &ptr->name) || |
811 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
812 | goto out; |
813 | } | |
814 | head->read_bit = 0; | |
815 | return true; | |
816 | out: | |
817 | head->read_bit = bit; | |
818 | head->read_avail = pos; | |
819 | return false; | |
820 | } | |
821 | ||
822 | /** | |
7ef61233 | 823 | * tomoyo_print_path2_acl - Print a double path ACL entry. |
9590837b KT |
824 | * |
825 | * @head: Pointer to "struct tomoyo_io_buffer". | |
7ef61233 | 826 | * @ptr: Pointer to "struct tomoyo_path2_acl". |
9590837b KT |
827 | * |
828 | * Returns true on success, false otherwise. | |
829 | */ | |
7ef61233 TH |
830 | static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head, |
831 | struct tomoyo_path2_acl *ptr) | |
9590837b KT |
832 | { |
833 | int pos; | |
9590837b KT |
834 | const u8 perm = ptr->perm; |
835 | u8 bit; | |
836 | ||
7ef61233 | 837 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { |
9590837b KT |
838 | if (!(perm & (1 << bit))) |
839 | continue; | |
9590837b | 840 | pos = head->read_avail; |
7762fbff | 841 | if (!tomoyo_io_printf(head, "allow_%s ", |
71c28236 | 842 | tomoyo_path2_keyword[bit]) || |
7762fbff TH |
843 | !tomoyo_print_name_union(head, &ptr->name1) || |
844 | !tomoyo_print_name_union(head, &ptr->name2) || | |
845 | !tomoyo_io_printf(head, "\n")) | |
9590837b KT |
846 | goto out; |
847 | } | |
848 | head->read_bit = 0; | |
849 | return true; | |
850 | out: | |
851 | head->read_bit = bit; | |
852 | head->read_avail = pos; | |
853 | return false; | |
854 | } | |
855 | ||
a1f9bb6a TH |
856 | /** |
857 | * tomoyo_print_path_number_acl - Print a path_number ACL entry. | |
858 | * | |
859 | * @head: Pointer to "struct tomoyo_io_buffer". | |
860 | * @ptr: Pointer to "struct tomoyo_path_number_acl". | |
861 | * | |
862 | * Returns true on success, false otherwise. | |
863 | */ | |
864 | static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head, | |
865 | struct tomoyo_path_number_acl *ptr) | |
866 | { | |
867 | int pos; | |
868 | u8 bit; | |
869 | const u8 perm = ptr->perm; | |
870 | for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; | |
871 | bit++) { | |
872 | if (!(perm & (1 << bit))) | |
873 | continue; | |
874 | pos = head->read_avail; | |
875 | if (!tomoyo_io_printf(head, "allow_%s", | |
71c28236 | 876 | tomoyo_path_number_keyword[bit]) || |
a1f9bb6a TH |
877 | !tomoyo_print_name_union(head, &ptr->name) || |
878 | !tomoyo_print_number_union(head, &ptr->number) || | |
879 | !tomoyo_io_printf(head, "\n")) | |
880 | goto out; | |
881 | } | |
882 | head->read_bit = 0; | |
883 | return true; | |
884 | out: | |
885 | head->read_bit = bit; | |
886 | head->read_avail = pos; | |
887 | return false; | |
888 | } | |
889 | ||
890 | /** | |
75093152 | 891 | * tomoyo_print_mkdev_acl - Print a mkdev ACL entry. |
a1f9bb6a TH |
892 | * |
893 | * @head: Pointer to "struct tomoyo_io_buffer". | |
75093152 | 894 | * @ptr: Pointer to "struct tomoyo_mkdev_acl". |
a1f9bb6a TH |
895 | * |
896 | * Returns true on success, false otherwise. | |
897 | */ | |
75093152 TH |
898 | static bool tomoyo_print_mkdev_acl(struct tomoyo_io_buffer *head, |
899 | struct tomoyo_mkdev_acl *ptr) | |
a1f9bb6a TH |
900 | { |
901 | int pos; | |
902 | u8 bit; | |
903 | const u16 perm = ptr->perm; | |
75093152 | 904 | for (bit = head->read_bit; bit < TOMOYO_MAX_MKDEV_OPERATION; |
a1f9bb6a TH |
905 | bit++) { |
906 | if (!(perm & (1 << bit))) | |
907 | continue; | |
908 | pos = head->read_avail; | |
909 | if (!tomoyo_io_printf(head, "allow_%s", | |
71c28236 | 910 | tomoyo_mkdev_keyword[bit]) || |
a1f9bb6a TH |
911 | !tomoyo_print_name_union(head, &ptr->name) || |
912 | !tomoyo_print_number_union(head, &ptr->mode) || | |
913 | !tomoyo_print_number_union(head, &ptr->major) || | |
914 | !tomoyo_print_number_union(head, &ptr->minor) || | |
915 | !tomoyo_io_printf(head, "\n")) | |
916 | goto out; | |
917 | } | |
918 | head->read_bit = 0; | |
919 | return true; | |
920 | out: | |
921 | head->read_bit = bit; | |
922 | head->read_avail = pos; | |
923 | return false; | |
924 | } | |
925 | ||
2106ccd9 TH |
926 | /** |
927 | * tomoyo_print_mount_acl - Print a mount ACL entry. | |
928 | * | |
929 | * @head: Pointer to "struct tomoyo_io_buffer". | |
930 | * @ptr: Pointer to "struct tomoyo_mount_acl". | |
931 | * | |
932 | * Returns true on success, false otherwise. | |
933 | */ | |
934 | static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head, | |
935 | struct tomoyo_mount_acl *ptr) | |
936 | { | |
937 | const int pos = head->read_avail; | |
938 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) || | |
939 | !tomoyo_print_name_union(head, &ptr->dev_name) || | |
940 | !tomoyo_print_name_union(head, &ptr->dir_name) || | |
941 | !tomoyo_print_name_union(head, &ptr->fs_type) || | |
942 | !tomoyo_print_number_union(head, &ptr->flags) || | |
943 | !tomoyo_io_printf(head, "\n")) { | |
944 | head->read_avail = pos; | |
945 | return false; | |
946 | } | |
947 | return true; | |
948 | } | |
949 | ||
9590837b KT |
950 | /** |
951 | * tomoyo_print_entry - Print an ACL entry. | |
952 | * | |
953 | * @head: Pointer to "struct tomoyo_io_buffer". | |
954 | * @ptr: Pointer to an ACL entry. | |
955 | * | |
956 | * Returns true on success, false otherwise. | |
957 | */ | |
958 | static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, | |
959 | struct tomoyo_acl_info *ptr) | |
960 | { | |
ea13ddba | 961 | const u8 acl_type = ptr->type; |
9590837b | 962 | |
237ab459 TH |
963 | if (ptr->is_deleted) |
964 | return true; | |
7ef61233 TH |
965 | if (acl_type == TOMOYO_TYPE_PATH_ACL) { |
966 | struct tomoyo_path_acl *acl | |
967 | = container_of(ptr, struct tomoyo_path_acl, head); | |
968 | return tomoyo_print_path_acl(head, acl); | |
9590837b | 969 | } |
7ef61233 TH |
970 | if (acl_type == TOMOYO_TYPE_PATH2_ACL) { |
971 | struct tomoyo_path2_acl *acl | |
972 | = container_of(ptr, struct tomoyo_path2_acl, head); | |
973 | return tomoyo_print_path2_acl(head, acl); | |
9590837b | 974 | } |
a1f9bb6a TH |
975 | if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) { |
976 | struct tomoyo_path_number_acl *acl | |
977 | = container_of(ptr, struct tomoyo_path_number_acl, | |
978 | head); | |
979 | return tomoyo_print_path_number_acl(head, acl); | |
980 | } | |
75093152 TH |
981 | if (acl_type == TOMOYO_TYPE_MKDEV_ACL) { |
982 | struct tomoyo_mkdev_acl *acl | |
983 | = container_of(ptr, struct tomoyo_mkdev_acl, | |
a1f9bb6a | 984 | head); |
75093152 | 985 | return tomoyo_print_mkdev_acl(head, acl); |
a1f9bb6a | 986 | } |
2106ccd9 TH |
987 | if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { |
988 | struct tomoyo_mount_acl *acl | |
989 | = container_of(ptr, struct tomoyo_mount_acl, head); | |
990 | return tomoyo_print_mount_acl(head, acl); | |
991 | } | |
9590837b KT |
992 | BUG(); /* This must not happen. */ |
993 | return false; | |
994 | } | |
995 | ||
996 | /** | |
997 | * tomoyo_read_domain_policy - Read domain policy. | |
998 | * | |
999 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1000 | * | |
fdb8ebb7 | 1001 | * Caller holds tomoyo_read_lock(). |
9590837b | 1002 | */ |
8fbe71f0 | 1003 | static void tomoyo_read_domain_policy(struct tomoyo_io_buffer *head) |
9590837b KT |
1004 | { |
1005 | struct list_head *dpos; | |
1006 | struct list_head *apos; | |
1007 | bool done = true; | |
1008 | ||
1009 | if (head->read_eof) | |
8fbe71f0 | 1010 | return; |
9590837b KT |
1011 | if (head->read_step == 0) |
1012 | head->read_step = 1; | |
9590837b KT |
1013 | list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) { |
1014 | struct tomoyo_domain_info *domain; | |
1015 | const char *quota_exceeded = ""; | |
1016 | const char *transition_failed = ""; | |
1017 | const char *ignore_global_allow_read = ""; | |
1018 | domain = list_entry(dpos, struct tomoyo_domain_info, list); | |
1019 | if (head->read_step != 1) | |
1020 | goto acl_loop; | |
1021 | if (domain->is_deleted && !head->read_single_domain) | |
1022 | continue; | |
1023 | /* Print domainname and flags. */ | |
1024 | if (domain->quota_warned) | |
1025 | quota_exceeded = "quota_exceeded\n"; | |
ea13ddba | 1026 | if (domain->transition_failed) |
9590837b | 1027 | transition_failed = "transition_failed\n"; |
ea13ddba | 1028 | if (domain->ignore_global_allow_read) |
9590837b KT |
1029 | ignore_global_allow_read |
1030 | = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n"; | |
7d2948b1 TH |
1031 | done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE |
1032 | "%u\n%s%s%s\n", | |
1033 | domain->domainname->name, | |
1034 | domain->profile, quota_exceeded, | |
1035 | transition_failed, | |
1036 | ignore_global_allow_read); | |
1037 | if (!done) | |
9590837b | 1038 | break; |
9590837b KT |
1039 | head->read_step = 2; |
1040 | acl_loop: | |
1041 | if (head->read_step == 3) | |
1042 | goto tail_mark; | |
1043 | /* Print ACL entries in the domain. */ | |
9590837b | 1044 | list_for_each_cookie(apos, head->read_var2, |
7d2948b1 | 1045 | &domain->acl_info_list) { |
9590837b KT |
1046 | struct tomoyo_acl_info *ptr |
1047 | = list_entry(apos, struct tomoyo_acl_info, | |
7d2948b1 TH |
1048 | list); |
1049 | done = tomoyo_print_entry(head, ptr); | |
1050 | if (!done) | |
9590837b | 1051 | break; |
9590837b | 1052 | } |
9590837b KT |
1053 | if (!done) |
1054 | break; | |
1055 | head->read_step = 3; | |
1056 | tail_mark: | |
7d2948b1 TH |
1057 | done = tomoyo_io_printf(head, "\n"); |
1058 | if (!done) | |
9590837b | 1059 | break; |
9590837b KT |
1060 | head->read_step = 1; |
1061 | if (head->read_single_domain) | |
1062 | break; | |
1063 | } | |
9590837b | 1064 | head->read_eof = done; |
9590837b KT |
1065 | } |
1066 | ||
1067 | /** | |
1068 | * tomoyo_write_domain_profile - Assign profile for specified domain. | |
1069 | * | |
1070 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1071 | * | |
1072 | * Returns 0 on success, -EINVAL otherwise. | |
1073 | * | |
1074 | * This is equivalent to doing | |
1075 | * | |
1076 | * ( echo "select " $domainname; echo "use_profile " $profile ) | | |
9b244373 | 1077 | * /usr/sbin/tomoyo-loadpolicy -d |
fdb8ebb7 TH |
1078 | * |
1079 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1080 | */ |
1081 | static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head) | |
1082 | { | |
1083 | char *data = head->write_buf; | |
1084 | char *cp = strchr(data, ' '); | |
1085 | struct tomoyo_domain_info *domain; | |
1086 | unsigned long profile; | |
1087 | ||
1088 | if (!cp) | |
1089 | return -EINVAL; | |
1090 | *cp = '\0'; | |
9590837b | 1091 | domain = tomoyo_find_domain(cp + 1); |
9590837b KT |
1092 | if (strict_strtoul(data, 10, &profile)) |
1093 | return -EINVAL; | |
1094 | if (domain && profile < TOMOYO_MAX_PROFILES | |
1095 | && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)) | |
1096 | domain->profile = (u8) profile; | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * tomoyo_read_domain_profile - Read only domainname and profile. | |
1102 | * | |
1103 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1104 | * | |
1105 | * Returns list of profile number and domainname pairs. | |
1106 | * | |
1107 | * This is equivalent to doing | |
1108 | * | |
1109 | * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | | |
1110 | * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) | |
1111 | * domainname = $0; } else if ( $1 == "use_profile" ) { | |
1112 | * print $2 " " domainname; domainname = ""; } } ; ' | |
fdb8ebb7 TH |
1113 | * |
1114 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1115 | */ |
8fbe71f0 | 1116 | static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head) |
9590837b KT |
1117 | { |
1118 | struct list_head *pos; | |
1119 | bool done = true; | |
1120 | ||
1121 | if (head->read_eof) | |
8fbe71f0 | 1122 | return; |
9590837b KT |
1123 | list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) { |
1124 | struct tomoyo_domain_info *domain; | |
1125 | domain = list_entry(pos, struct tomoyo_domain_info, list); | |
1126 | if (domain->is_deleted) | |
1127 | continue; | |
7d2948b1 TH |
1128 | done = tomoyo_io_printf(head, "%u %s\n", domain->profile, |
1129 | domain->domainname->name); | |
1130 | if (!done) | |
9590837b | 1131 | break; |
9590837b | 1132 | } |
9590837b | 1133 | head->read_eof = done; |
9590837b KT |
1134 | } |
1135 | ||
1136 | /** | |
1137 | * tomoyo_write_pid: Specify PID to obtain domainname. | |
1138 | * | |
1139 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1140 | * | |
1141 | * Returns 0. | |
1142 | */ | |
1143 | static int tomoyo_write_pid(struct tomoyo_io_buffer *head) | |
1144 | { | |
1145 | unsigned long pid; | |
1146 | /* No error check. */ | |
1147 | strict_strtoul(head->write_buf, 10, &pid); | |
1148 | head->read_step = (int) pid; | |
1149 | head->read_eof = false; | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | /** | |
1154 | * tomoyo_read_pid - Get domainname of the specified PID. | |
1155 | * | |
1156 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1157 | * | |
1158 | * Returns the domainname which the specified PID is in on success, | |
1159 | * empty string otherwise. | |
1160 | * The PID is specified by tomoyo_write_pid() so that the user can obtain | |
1161 | * using read()/write() interface rather than sysctl() interface. | |
1162 | */ | |
8fbe71f0 | 1163 | static void tomoyo_read_pid(struct tomoyo_io_buffer *head) |
9590837b KT |
1164 | { |
1165 | if (head->read_avail == 0 && !head->read_eof) { | |
1166 | const int pid = head->read_step; | |
1167 | struct task_struct *p; | |
1168 | struct tomoyo_domain_info *domain = NULL; | |
1fcdc7c5 | 1169 | rcu_read_lock(); |
9590837b KT |
1170 | read_lock(&tasklist_lock); |
1171 | p = find_task_by_vpid(pid); | |
1172 | if (p) | |
1173 | domain = tomoyo_real_domain(p); | |
1174 | read_unlock(&tasklist_lock); | |
1fcdc7c5 | 1175 | rcu_read_unlock(); |
9590837b KT |
1176 | if (domain) |
1177 | tomoyo_io_printf(head, "%d %u %s", pid, domain->profile, | |
1178 | domain->domainname->name); | |
1179 | head->read_eof = true; | |
1180 | } | |
9590837b KT |
1181 | } |
1182 | ||
1183 | /** | |
1184 | * tomoyo_write_exception_policy - Write exception policy. | |
1185 | * | |
1186 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1187 | * | |
1188 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
1189 | * |
1190 | * Caller holds tomoyo_read_lock(). | |
9590837b KT |
1191 | */ |
1192 | static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head) | |
1193 | { | |
1194 | char *data = head->write_buf; | |
1195 | bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE); | |
1196 | ||
1197 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN)) | |
1198 | return tomoyo_write_domain_keeper_policy(data, false, | |
1199 | is_delete); | |
1200 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN)) | |
1201 | return tomoyo_write_domain_keeper_policy(data, true, is_delete); | |
1202 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN)) | |
1203 | return tomoyo_write_domain_initializer_policy(data, false, | |
1204 | is_delete); | |
1205 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN)) | |
1206 | return tomoyo_write_domain_initializer_policy(data, true, | |
1207 | is_delete); | |
1084307c TH |
1208 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR)) |
1209 | return tomoyo_write_aggregator_policy(data, is_delete); | |
9590837b KT |
1210 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS)) |
1211 | return tomoyo_write_alias_policy(data, is_delete); | |
1212 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ)) | |
1213 | return tomoyo_write_globally_readable_policy(data, is_delete); | |
1214 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN)) | |
1215 | return tomoyo_write_pattern_policy(data, is_delete); | |
1216 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE)) | |
1217 | return tomoyo_write_no_rewrite_policy(data, is_delete); | |
7762fbff TH |
1218 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP)) |
1219 | return tomoyo_write_path_group_policy(data, is_delete); | |
4c3e9e2d TH |
1220 | if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP)) |
1221 | return tomoyo_write_number_group_policy(data, is_delete); | |
9590837b KT |
1222 | return -EINVAL; |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * tomoyo_read_exception_policy - Read exception policy. | |
1227 | * | |
1228 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1229 | * | |
fdb8ebb7 | 1230 | * Caller holds tomoyo_read_lock(). |
9590837b | 1231 | */ |
8fbe71f0 | 1232 | static void tomoyo_read_exception_policy(struct tomoyo_io_buffer *head) |
9590837b KT |
1233 | { |
1234 | if (!head->read_eof) { | |
1235 | switch (head->read_step) { | |
1236 | case 0: | |
1237 | head->read_var2 = NULL; | |
1238 | head->read_step = 1; | |
1239 | case 1: | |
1240 | if (!tomoyo_read_domain_keeper_policy(head)) | |
1241 | break; | |
1242 | head->read_var2 = NULL; | |
1243 | head->read_step = 2; | |
1244 | case 2: | |
1245 | if (!tomoyo_read_globally_readable_policy(head)) | |
1246 | break; | |
1247 | head->read_var2 = NULL; | |
1248 | head->read_step = 3; | |
1249 | case 3: | |
1250 | head->read_var2 = NULL; | |
1251 | head->read_step = 4; | |
1252 | case 4: | |
1253 | if (!tomoyo_read_domain_initializer_policy(head)) | |
1254 | break; | |
1255 | head->read_var2 = NULL; | |
1256 | head->read_step = 5; | |
1257 | case 5: | |
1258 | if (!tomoyo_read_alias_policy(head)) | |
1259 | break; | |
1260 | head->read_var2 = NULL; | |
1261 | head->read_step = 6; | |
1262 | case 6: | |
1084307c TH |
1263 | if (!tomoyo_read_aggregator_policy(head)) |
1264 | break; | |
9590837b KT |
1265 | head->read_var2 = NULL; |
1266 | head->read_step = 7; | |
1267 | case 7: | |
1268 | if (!tomoyo_read_file_pattern(head)) | |
1269 | break; | |
1270 | head->read_var2 = NULL; | |
1271 | head->read_step = 8; | |
1272 | case 8: | |
1273 | if (!tomoyo_read_no_rewrite_policy(head)) | |
1274 | break; | |
1275 | head->read_var2 = NULL; | |
1276 | head->read_step = 9; | |
1277 | case 9: | |
7762fbff TH |
1278 | if (!tomoyo_read_path_group_policy(head)) |
1279 | break; | |
1280 | head->read_var1 = NULL; | |
1281 | head->read_var2 = NULL; | |
1282 | head->read_step = 10; | |
1283 | case 10: | |
4c3e9e2d TH |
1284 | if (!tomoyo_read_number_group_policy(head)) |
1285 | break; | |
1286 | head->read_var1 = NULL; | |
1287 | head->read_var2 = NULL; | |
1288 | head->read_step = 11; | |
1289 | case 11: | |
9590837b KT |
1290 | head->read_eof = true; |
1291 | break; | |
9590837b KT |
1292 | } |
1293 | } | |
9590837b KT |
1294 | } |
1295 | ||
17fcfbd9 TH |
1296 | /** |
1297 | * tomoyo_print_header - Get header line of audit log. | |
1298 | * | |
1299 | * @r: Pointer to "struct tomoyo_request_info". | |
1300 | * | |
1301 | * Returns string representation. | |
1302 | * | |
1303 | * This function uses kmalloc(), so caller must kfree() if this function | |
1304 | * didn't return NULL. | |
1305 | */ | |
1306 | static char *tomoyo_print_header(struct tomoyo_request_info *r) | |
1307 | { | |
1308 | static const char *tomoyo_mode_4[4] = { | |
1309 | "disabled", "learning", "permissive", "enforcing" | |
1310 | }; | |
1311 | struct timeval tv; | |
1312 | const pid_t gpid = task_pid_nr(current); | |
1313 | static const int tomoyo_buffer_len = 4096; | |
1314 | char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); | |
1315 | if (!buffer) | |
1316 | return NULL; | |
1317 | do_gettimeofday(&tv); | |
1318 | snprintf(buffer, tomoyo_buffer_len - 1, | |
1319 | "#timestamp=%lu profile=%u mode=%s (global-pid=%u)" | |
1320 | " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u" | |
1321 | " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", | |
1322 | tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid, | |
1323 | (pid_t) sys_getpid(), (pid_t) sys_getppid(), | |
1324 | current_uid(), current_gid(), current_euid(), | |
1325 | current_egid(), current_suid(), current_sgid(), | |
1326 | current_fsuid(), current_fsgid()); | |
1327 | return buffer; | |
1328 | } | |
1329 | ||
1330 | /** | |
1331 | * tomoyo_init_audit_log - Allocate buffer for audit logs. | |
1332 | * | |
1333 | * @len: Required size. | |
1334 | * @r: Pointer to "struct tomoyo_request_info". | |
1335 | * | |
1336 | * Returns pointer to allocated memory. | |
1337 | * | |
1338 | * The @len is updated to add the header lines' size on success. | |
1339 | * | |
1340 | * This function uses kzalloc(), so caller must kfree() if this function | |
1341 | * didn't return NULL. | |
1342 | */ | |
1343 | static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r) | |
1344 | { | |
1345 | char *buf = NULL; | |
1346 | const char *header; | |
1347 | const char *domainname; | |
1348 | if (!r->domain) | |
1349 | r->domain = tomoyo_domain(); | |
1350 | domainname = r->domain->domainname->name; | |
1351 | header = tomoyo_print_header(r); | |
1352 | if (!header) | |
1353 | return NULL; | |
1354 | *len += strlen(domainname) + strlen(header) + 10; | |
1355 | buf = kzalloc(*len, GFP_NOFS); | |
1356 | if (buf) | |
1357 | snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname); | |
1358 | kfree(header); | |
1359 | return buf; | |
1360 | } | |
1361 | ||
1362 | /* Wait queue for tomoyo_query_list. */ | |
1363 | static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait); | |
1364 | ||
1365 | /* Lock for manipulating tomoyo_query_list. */ | |
1366 | static DEFINE_SPINLOCK(tomoyo_query_list_lock); | |
1367 | ||
1368 | /* Structure for query. */ | |
1369 | struct tomoyo_query_entry { | |
1370 | struct list_head list; | |
1371 | char *query; | |
1372 | int query_len; | |
1373 | unsigned int serial; | |
1374 | int timer; | |
1375 | int answer; | |
1376 | }; | |
1377 | ||
1378 | /* The list for "struct tomoyo_query_entry". */ | |
1379 | static LIST_HEAD(tomoyo_query_list); | |
1380 | ||
1381 | /* | |
1382 | * Number of "struct file" referring /sys/kernel/security/tomoyo/query | |
1383 | * interface. | |
1384 | */ | |
1385 | static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); | |
1386 | ||
1387 | /** | |
1388 | * tomoyo_supervisor - Ask for the supervisor's decision. | |
1389 | * | |
1390 | * @r: Pointer to "struct tomoyo_request_info". | |
1391 | * @fmt: The printf()'s format string, followed by parameters. | |
1392 | * | |
1393 | * Returns 0 if the supervisor decided to permit the access request which | |
1394 | * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the | |
1395 | * supervisor decided to retry the access request which violated the policy in | |
1396 | * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise. | |
1397 | */ | |
1398 | int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) | |
1399 | { | |
1400 | va_list args; | |
1401 | int error = -EPERM; | |
1402 | int pos; | |
1403 | int len; | |
1404 | static unsigned int tomoyo_serial; | |
1405 | struct tomoyo_query_entry *tomoyo_query_entry = NULL; | |
1406 | bool quota_exceeded = false; | |
1407 | char *header; | |
1408 | switch (r->mode) { | |
1409 | char *buffer; | |
1410 | case TOMOYO_CONFIG_LEARNING: | |
1411 | if (!tomoyo_domain_quota_is_ok(r)) | |
1412 | return 0; | |
1413 | va_start(args, fmt); | |
1414 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4; | |
1415 | va_end(args); | |
1416 | buffer = kmalloc(len, GFP_NOFS); | |
1417 | if (!buffer) | |
1418 | return 0; | |
1419 | va_start(args, fmt); | |
1420 | vsnprintf(buffer, len - 1, fmt, args); | |
1421 | va_end(args); | |
1422 | tomoyo_normalize_line(buffer); | |
1423 | tomoyo_write_domain_policy2(buffer, r->domain, false); | |
1424 | kfree(buffer); | |
1425 | /* fall through */ | |
1426 | case TOMOYO_CONFIG_PERMISSIVE: | |
1427 | return 0; | |
1428 | } | |
1429 | if (!r->domain) | |
1430 | r->domain = tomoyo_domain(); | |
1431 | if (!atomic_read(&tomoyo_query_observers)) | |
1432 | return -EPERM; | |
1433 | va_start(args, fmt); | |
1434 | len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32; | |
1435 | va_end(args); | |
1436 | header = tomoyo_init_audit_log(&len, r); | |
1437 | if (!header) | |
1438 | goto out; | |
1439 | tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS); | |
1440 | if (!tomoyo_query_entry) | |
1441 | goto out; | |
1442 | tomoyo_query_entry->query = kzalloc(len, GFP_NOFS); | |
1443 | if (!tomoyo_query_entry->query) | |
1444 | goto out; | |
1445 | len = ksize(tomoyo_query_entry->query); | |
1446 | INIT_LIST_HEAD(&tomoyo_query_entry->list); | |
1447 | spin_lock(&tomoyo_query_list_lock); | |
1448 | if (tomoyo_quota_for_query && tomoyo_query_memory_size + len + | |
1449 | sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) { | |
1450 | quota_exceeded = true; | |
1451 | } else { | |
1452 | tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry); | |
1453 | tomoyo_query_entry->serial = tomoyo_serial++; | |
1454 | } | |
1455 | spin_unlock(&tomoyo_query_list_lock); | |
1456 | if (quota_exceeded) | |
1457 | goto out; | |
1458 | pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s", | |
1459 | tomoyo_query_entry->serial, r->retry, header); | |
1460 | kfree(header); | |
1461 | header = NULL; | |
1462 | va_start(args, fmt); | |
1463 | vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args); | |
1464 | tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1; | |
1465 | va_end(args); | |
1466 | spin_lock(&tomoyo_query_list_lock); | |
1467 | list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list); | |
1468 | spin_unlock(&tomoyo_query_list_lock); | |
1469 | /* Give 10 seconds for supervisor's opinion. */ | |
1470 | for (tomoyo_query_entry->timer = 0; | |
1471 | atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100; | |
1472 | tomoyo_query_entry->timer++) { | |
1473 | wake_up(&tomoyo_query_wait); | |
1474 | set_current_state(TASK_INTERRUPTIBLE); | |
1475 | schedule_timeout(HZ / 10); | |
1476 | if (tomoyo_query_entry->answer) | |
1477 | break; | |
1478 | } | |
1479 | spin_lock(&tomoyo_query_list_lock); | |
1480 | list_del(&tomoyo_query_entry->list); | |
1481 | tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry); | |
1482 | spin_unlock(&tomoyo_query_list_lock); | |
1483 | switch (tomoyo_query_entry->answer) { | |
1484 | case 3: /* Asked to retry by administrator. */ | |
1485 | error = TOMOYO_RETRY_REQUEST; | |
1486 | r->retry++; | |
1487 | break; | |
1488 | case 1: | |
1489 | /* Granted by administrator. */ | |
1490 | error = 0; | |
1491 | break; | |
1492 | case 0: | |
1493 | /* Timed out. */ | |
1494 | break; | |
1495 | default: | |
1496 | /* Rejected by administrator. */ | |
1497 | break; | |
1498 | } | |
1499 | out: | |
1500 | if (tomoyo_query_entry) | |
1501 | kfree(tomoyo_query_entry->query); | |
1502 | kfree(tomoyo_query_entry); | |
1503 | kfree(header); | |
1504 | return error; | |
1505 | } | |
1506 | ||
1507 | /** | |
1508 | * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query. | |
1509 | * | |
1510 | * @file: Pointer to "struct file". | |
1511 | * @wait: Pointer to "poll_table". | |
1512 | * | |
1513 | * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. | |
1514 | * | |
1515 | * Waits for access requests which violated policy in enforcing mode. | |
1516 | */ | |
1517 | static int tomoyo_poll_query(struct file *file, poll_table *wait) | |
1518 | { | |
1519 | struct list_head *tmp; | |
1520 | bool found = false; | |
1521 | u8 i; | |
1522 | for (i = 0; i < 2; i++) { | |
1523 | spin_lock(&tomoyo_query_list_lock); | |
1524 | list_for_each(tmp, &tomoyo_query_list) { | |
1525 | struct tomoyo_query_entry *ptr | |
1526 | = list_entry(tmp, struct tomoyo_query_entry, | |
1527 | list); | |
1528 | if (ptr->answer) | |
1529 | continue; | |
1530 | found = true; | |
1531 | break; | |
1532 | } | |
1533 | spin_unlock(&tomoyo_query_list_lock); | |
1534 | if (found) | |
1535 | return POLLIN | POLLRDNORM; | |
1536 | if (i) | |
1537 | break; | |
1538 | poll_wait(file, &tomoyo_query_wait, wait); | |
1539 | } | |
1540 | return 0; | |
1541 | } | |
1542 | ||
1543 | /** | |
1544 | * tomoyo_read_query - Read access requests which violated policy in enforcing mode. | |
1545 | * | |
1546 | * @head: Pointer to "struct tomoyo_io_buffer". | |
17fcfbd9 | 1547 | */ |
8fbe71f0 | 1548 | static void tomoyo_read_query(struct tomoyo_io_buffer *head) |
17fcfbd9 TH |
1549 | { |
1550 | struct list_head *tmp; | |
1551 | int pos = 0; | |
1552 | int len = 0; | |
1553 | char *buf; | |
1554 | if (head->read_avail) | |
8fbe71f0 | 1555 | return; |
17fcfbd9 TH |
1556 | if (head->read_buf) { |
1557 | kfree(head->read_buf); | |
1558 | head->read_buf = NULL; | |
1559 | head->readbuf_size = 0; | |
1560 | } | |
1561 | spin_lock(&tomoyo_query_list_lock); | |
1562 | list_for_each(tmp, &tomoyo_query_list) { | |
1563 | struct tomoyo_query_entry *ptr | |
1564 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1565 | if (ptr->answer) | |
1566 | continue; | |
1567 | if (pos++ != head->read_step) | |
1568 | continue; | |
1569 | len = ptr->query_len; | |
1570 | break; | |
1571 | } | |
1572 | spin_unlock(&tomoyo_query_list_lock); | |
1573 | if (!len) { | |
1574 | head->read_step = 0; | |
8fbe71f0 | 1575 | return; |
17fcfbd9 TH |
1576 | } |
1577 | buf = kzalloc(len, GFP_NOFS); | |
1578 | if (!buf) | |
8fbe71f0 | 1579 | return; |
17fcfbd9 TH |
1580 | pos = 0; |
1581 | spin_lock(&tomoyo_query_list_lock); | |
1582 | list_for_each(tmp, &tomoyo_query_list) { | |
1583 | struct tomoyo_query_entry *ptr | |
1584 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1585 | if (ptr->answer) | |
1586 | continue; | |
1587 | if (pos++ != head->read_step) | |
1588 | continue; | |
1589 | /* | |
1590 | * Some query can be skipped because tomoyo_query_list | |
1591 | * can change, but I don't care. | |
1592 | */ | |
1593 | if (len == ptr->query_len) | |
1594 | memmove(buf, ptr->query, len); | |
1595 | break; | |
1596 | } | |
1597 | spin_unlock(&tomoyo_query_list_lock); | |
1598 | if (buf[0]) { | |
1599 | head->read_avail = len; | |
1600 | head->readbuf_size = head->read_avail; | |
1601 | head->read_buf = buf; | |
1602 | head->read_step++; | |
1603 | } else { | |
1604 | kfree(buf); | |
1605 | } | |
17fcfbd9 TH |
1606 | } |
1607 | ||
1608 | /** | |
1609 | * tomoyo_write_answer - Write the supervisor's decision. | |
1610 | * | |
1611 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1612 | * | |
1613 | * Returns 0 on success, -EINVAL otherwise. | |
1614 | */ | |
1615 | static int tomoyo_write_answer(struct tomoyo_io_buffer *head) | |
1616 | { | |
1617 | char *data = head->write_buf; | |
1618 | struct list_head *tmp; | |
1619 | unsigned int serial; | |
1620 | unsigned int answer; | |
1621 | spin_lock(&tomoyo_query_list_lock); | |
1622 | list_for_each(tmp, &tomoyo_query_list) { | |
1623 | struct tomoyo_query_entry *ptr | |
1624 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1625 | ptr->timer = 0; | |
1626 | } | |
1627 | spin_unlock(&tomoyo_query_list_lock); | |
1628 | if (sscanf(data, "A%u=%u", &serial, &answer) != 2) | |
1629 | return -EINVAL; | |
1630 | spin_lock(&tomoyo_query_list_lock); | |
1631 | list_for_each(tmp, &tomoyo_query_list) { | |
1632 | struct tomoyo_query_entry *ptr | |
1633 | = list_entry(tmp, struct tomoyo_query_entry, list); | |
1634 | if (ptr->serial != serial) | |
1635 | continue; | |
1636 | if (!ptr->answer) | |
1637 | ptr->answer = answer; | |
1638 | break; | |
1639 | } | |
1640 | spin_unlock(&tomoyo_query_list_lock); | |
1641 | return 0; | |
1642 | } | |
1643 | ||
9590837b KT |
1644 | /** |
1645 | * tomoyo_read_version: Get version. | |
1646 | * | |
1647 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1648 | * | |
1649 | * Returns version information. | |
1650 | */ | |
8fbe71f0 | 1651 | static void tomoyo_read_version(struct tomoyo_io_buffer *head) |
9590837b KT |
1652 | { |
1653 | if (!head->read_eof) { | |
57c2590f | 1654 | tomoyo_io_printf(head, "2.3.0-pre"); |
9590837b KT |
1655 | head->read_eof = true; |
1656 | } | |
9590837b KT |
1657 | } |
1658 | ||
1659 | /** | |
1660 | * tomoyo_read_self_domain - Get the current process's domainname. | |
1661 | * | |
1662 | * @head: Pointer to "struct tomoyo_io_buffer". | |
1663 | * | |
1664 | * Returns the current process's domainname. | |
1665 | */ | |
8fbe71f0 | 1666 | static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head) |
9590837b KT |
1667 | { |
1668 | if (!head->read_eof) { | |
1669 | /* | |
1670 | * tomoyo_domain()->domainname != NULL | |
1671 | * because every process belongs to a domain and | |
1672 | * the domain's name cannot be NULL. | |
1673 | */ | |
1674 | tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name); | |
1675 | head->read_eof = true; | |
1676 | } | |
9590837b KT |
1677 | } |
1678 | ||
1679 | /** | |
1680 | * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface. | |
1681 | * | |
1682 | * @type: Type of interface. | |
1683 | * @file: Pointer to "struct file". | |
1684 | * | |
1685 | * Associates policy handler and returns 0 on success, -ENOMEM otherwise. | |
fdb8ebb7 TH |
1686 | * |
1687 | * Caller acquires tomoyo_read_lock(). | |
9590837b | 1688 | */ |
c3ef1500 | 1689 | int tomoyo_open_control(const u8 type, struct file *file) |
9590837b | 1690 | { |
4e5d6f7e | 1691 | struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS); |
9590837b KT |
1692 | |
1693 | if (!head) | |
1694 | return -ENOMEM; | |
1695 | mutex_init(&head->io_sem); | |
17fcfbd9 | 1696 | head->type = type; |
9590837b KT |
1697 | switch (type) { |
1698 | case TOMOYO_DOMAINPOLICY: | |
1699 | /* /sys/kernel/security/tomoyo/domain_policy */ | |
1700 | head->write = tomoyo_write_domain_policy; | |
1701 | head->read = tomoyo_read_domain_policy; | |
1702 | break; | |
1703 | case TOMOYO_EXCEPTIONPOLICY: | |
1704 | /* /sys/kernel/security/tomoyo/exception_policy */ | |
1705 | head->write = tomoyo_write_exception_policy; | |
1706 | head->read = tomoyo_read_exception_policy; | |
1707 | break; | |
1708 | case TOMOYO_SELFDOMAIN: | |
1709 | /* /sys/kernel/security/tomoyo/self_domain */ | |
1710 | head->read = tomoyo_read_self_domain; | |
1711 | break; | |
1712 | case TOMOYO_DOMAIN_STATUS: | |
1713 | /* /sys/kernel/security/tomoyo/.domain_status */ | |
1714 | head->write = tomoyo_write_domain_profile; | |
1715 | head->read = tomoyo_read_domain_profile; | |
1716 | break; | |
1717 | case TOMOYO_PROCESS_STATUS: | |
1718 | /* /sys/kernel/security/tomoyo/.process_status */ | |
1719 | head->write = tomoyo_write_pid; | |
1720 | head->read = tomoyo_read_pid; | |
1721 | break; | |
1722 | case TOMOYO_VERSION: | |
1723 | /* /sys/kernel/security/tomoyo/version */ | |
1724 | head->read = tomoyo_read_version; | |
1725 | head->readbuf_size = 128; | |
1726 | break; | |
1727 | case TOMOYO_MEMINFO: | |
1728 | /* /sys/kernel/security/tomoyo/meminfo */ | |
1729 | head->write = tomoyo_write_memory_quota; | |
1730 | head->read = tomoyo_read_memory_counter; | |
1731 | head->readbuf_size = 512; | |
1732 | break; | |
1733 | case TOMOYO_PROFILE: | |
1734 | /* /sys/kernel/security/tomoyo/profile */ | |
1735 | head->write = tomoyo_write_profile; | |
1736 | head->read = tomoyo_read_profile; | |
1737 | break; | |
17fcfbd9 TH |
1738 | case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */ |
1739 | head->poll = tomoyo_poll_query; | |
1740 | head->write = tomoyo_write_answer; | |
1741 | head->read = tomoyo_read_query; | |
1742 | break; | |
9590837b KT |
1743 | case TOMOYO_MANAGER: |
1744 | /* /sys/kernel/security/tomoyo/manager */ | |
1745 | head->write = tomoyo_write_manager_policy; | |
1746 | head->read = tomoyo_read_manager_policy; | |
1747 | break; | |
1748 | } | |
1749 | if (!(file->f_mode & FMODE_READ)) { | |
1750 | /* | |
1751 | * No need to allocate read_buf since it is not opened | |
1752 | * for reading. | |
1753 | */ | |
1754 | head->read = NULL; | |
17fcfbd9 TH |
1755 | head->poll = NULL; |
1756 | } else if (!head->poll) { | |
1757 | /* Don't allocate read_buf for poll() access. */ | |
9590837b KT |
1758 | if (!head->readbuf_size) |
1759 | head->readbuf_size = 4096 * 2; | |
4e5d6f7e | 1760 | head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS); |
9590837b | 1761 | if (!head->read_buf) { |
8e2d39a1 | 1762 | kfree(head); |
9590837b KT |
1763 | return -ENOMEM; |
1764 | } | |
1765 | } | |
1766 | if (!(file->f_mode & FMODE_WRITE)) { | |
1767 | /* | |
1768 | * No need to allocate write_buf since it is not opened | |
1769 | * for writing. | |
1770 | */ | |
1771 | head->write = NULL; | |
1772 | } else if (head->write) { | |
1773 | head->writebuf_size = 4096 * 2; | |
4e5d6f7e | 1774 | head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS); |
9590837b | 1775 | if (!head->write_buf) { |
8e2d39a1 TH |
1776 | kfree(head->read_buf); |
1777 | kfree(head); | |
9590837b KT |
1778 | return -ENOMEM; |
1779 | } | |
1780 | } | |
17fcfbd9 TH |
1781 | if (type != TOMOYO_QUERY) |
1782 | head->reader_idx = tomoyo_read_lock(); | |
9590837b KT |
1783 | file->private_data = head; |
1784 | /* | |
1785 | * Call the handler now if the file is | |
1786 | * /sys/kernel/security/tomoyo/self_domain | |
1787 | * so that the user can use | |
1788 | * cat < /sys/kernel/security/tomoyo/self_domain" | |
1789 | * to know the current process's domainname. | |
1790 | */ | |
1791 | if (type == TOMOYO_SELFDOMAIN) | |
1792 | tomoyo_read_control(file, NULL, 0); | |
17fcfbd9 TH |
1793 | /* |
1794 | * If the file is /sys/kernel/security/tomoyo/query , increment the | |
1795 | * observer counter. | |
1796 | * The obserber counter is used by tomoyo_supervisor() to see if | |
1797 | * there is some process monitoring /sys/kernel/security/tomoyo/query. | |
1798 | */ | |
1799 | else if (type == TOMOYO_QUERY) | |
1800 | atomic_inc(&tomoyo_query_observers); | |
9590837b KT |
1801 | return 0; |
1802 | } | |
1803 | ||
17fcfbd9 TH |
1804 | /** |
1805 | * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface. | |
1806 | * | |
1807 | * @file: Pointer to "struct file". | |
1808 | * @wait: Pointer to "poll_table". | |
1809 | * | |
1810 | * Waits for read readiness. | |
1811 | * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd . | |
1812 | */ | |
1813 | int tomoyo_poll_control(struct file *file, poll_table *wait) | |
1814 | { | |
1815 | struct tomoyo_io_buffer *head = file->private_data; | |
1816 | if (!head->poll) | |
1817 | return -ENOSYS; | |
1818 | return head->poll(file, wait); | |
1819 | } | |
1820 | ||
9590837b KT |
1821 | /** |
1822 | * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface. | |
1823 | * | |
1824 | * @file: Pointer to "struct file". | |
1825 | * @buffer: Poiner to buffer to write to. | |
1826 | * @buffer_len: Size of @buffer. | |
1827 | * | |
1828 | * Returns bytes read on success, negative value otherwise. | |
fdb8ebb7 TH |
1829 | * |
1830 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1831 | */ |
c3ef1500 TH |
1832 | int tomoyo_read_control(struct file *file, char __user *buffer, |
1833 | const int buffer_len) | |
9590837b KT |
1834 | { |
1835 | int len = 0; | |
1836 | struct tomoyo_io_buffer *head = file->private_data; | |
1837 | char *cp; | |
1838 | ||
1839 | if (!head->read) | |
1840 | return -ENOSYS; | |
1841 | if (mutex_lock_interruptible(&head->io_sem)) | |
1842 | return -EINTR; | |
1843 | /* Call the policy handler. */ | |
8fbe71f0 | 1844 | head->read(head); |
9590837b KT |
1845 | if (len < 0) |
1846 | goto out; | |
1847 | /* Write to buffer. */ | |
1848 | len = head->read_avail; | |
1849 | if (len > buffer_len) | |
1850 | len = buffer_len; | |
1851 | if (!len) | |
1852 | goto out; | |
1853 | /* head->read_buf changes by some functions. */ | |
1854 | cp = head->read_buf; | |
1855 | if (copy_to_user(buffer, cp, len)) { | |
1856 | len = -EFAULT; | |
1857 | goto out; | |
1858 | } | |
1859 | head->read_avail -= len; | |
1860 | memmove(cp, cp + len, head->read_avail); | |
1861 | out: | |
1862 | mutex_unlock(&head->io_sem); | |
1863 | return len; | |
1864 | } | |
1865 | ||
1866 | /** | |
1867 | * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface. | |
1868 | * | |
1869 | * @file: Pointer to "struct file". | |
1870 | * @buffer: Pointer to buffer to read from. | |
1871 | * @buffer_len: Size of @buffer. | |
1872 | * | |
1873 | * Returns @buffer_len on success, negative value otherwise. | |
fdb8ebb7 TH |
1874 | * |
1875 | * Caller holds tomoyo_read_lock(). | |
9590837b | 1876 | */ |
c3ef1500 TH |
1877 | int tomoyo_write_control(struct file *file, const char __user *buffer, |
1878 | const int buffer_len) | |
9590837b KT |
1879 | { |
1880 | struct tomoyo_io_buffer *head = file->private_data; | |
1881 | int error = buffer_len; | |
1882 | int avail_len = buffer_len; | |
1883 | char *cp0 = head->write_buf; | |
1884 | ||
1885 | if (!head->write) | |
1886 | return -ENOSYS; | |
1887 | if (!access_ok(VERIFY_READ, buffer, buffer_len)) | |
1888 | return -EFAULT; | |
1889 | /* Don't allow updating policies by non manager programs. */ | |
1890 | if (head->write != tomoyo_write_pid && | |
1891 | head->write != tomoyo_write_domain_policy && | |
75093152 | 1892 | !tomoyo_policy_manager()) |
9590837b KT |
1893 | return -EPERM; |
1894 | if (mutex_lock_interruptible(&head->io_sem)) | |
1895 | return -EINTR; | |
1896 | /* Read a line and dispatch it to the policy handler. */ | |
1897 | while (avail_len > 0) { | |
1898 | char c; | |
1899 | if (head->write_avail >= head->writebuf_size - 1) { | |
1900 | error = -ENOMEM; | |
1901 | break; | |
1902 | } else if (get_user(c, buffer)) { | |
1903 | error = -EFAULT; | |
1904 | break; | |
1905 | } | |
1906 | buffer++; | |
1907 | avail_len--; | |
1908 | cp0[head->write_avail++] = c; | |
1909 | if (c != '\n') | |
1910 | continue; | |
1911 | cp0[head->write_avail - 1] = '\0'; | |
1912 | head->write_avail = 0; | |
1913 | tomoyo_normalize_line(cp0); | |
1914 | head->write(head); | |
1915 | } | |
1916 | mutex_unlock(&head->io_sem); | |
1917 | return error; | |
1918 | } | |
1919 | ||
1920 | /** | |
1921 | * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface. | |
1922 | * | |
1923 | * @file: Pointer to "struct file". | |
1924 | * | |
1925 | * Releases memory and returns 0. | |
fdb8ebb7 TH |
1926 | * |
1927 | * Caller looses tomoyo_read_lock(). | |
9590837b | 1928 | */ |
c3ef1500 | 1929 | int tomoyo_close_control(struct file *file) |
9590837b KT |
1930 | { |
1931 | struct tomoyo_io_buffer *head = file->private_data; | |
847b173e | 1932 | const bool is_write = !!head->write_buf; |
9590837b | 1933 | |
17fcfbd9 TH |
1934 | /* |
1935 | * If the file is /sys/kernel/security/tomoyo/query , decrement the | |
1936 | * observer counter. | |
1937 | */ | |
1938 | if (head->type == TOMOYO_QUERY) | |
1939 | atomic_dec(&tomoyo_query_observers); | |
1940 | else | |
1941 | tomoyo_read_unlock(head->reader_idx); | |
9590837b | 1942 | /* Release memory used for policy I/O. */ |
8e2d39a1 | 1943 | kfree(head->read_buf); |
9590837b | 1944 | head->read_buf = NULL; |
8e2d39a1 | 1945 | kfree(head->write_buf); |
9590837b | 1946 | head->write_buf = NULL; |
8e2d39a1 | 1947 | kfree(head); |
9590837b KT |
1948 | head = NULL; |
1949 | file->private_data = NULL; | |
847b173e TH |
1950 | if (is_write) |
1951 | tomoyo_run_gc(); | |
9590837b KT |
1952 | return 0; |
1953 | } | |
1954 | ||
9590837b | 1955 | /** |
c3ef1500 | 1956 | * tomoyo_check_profile - Check all profiles currently assigned to domains are defined. |
9590837b | 1957 | */ |
c3ef1500 | 1958 | void tomoyo_check_profile(void) |
9590837b | 1959 | { |
c3ef1500 TH |
1960 | struct tomoyo_domain_info *domain; |
1961 | const int idx = tomoyo_read_lock(); | |
1962 | tomoyo_policy_loaded = true; | |
1963 | /* Check all profiles currently assigned to domains are defined. */ | |
1964 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
1965 | const u8 profile = domain->profile; | |
1966 | if (tomoyo_profile_ptr[profile]) | |
1967 | continue; | |
1968 | panic("Profile %u (used by '%s') not defined.\n", | |
1969 | profile, domain->domainname->name); | |
1970 | } | |
1971 | tomoyo_read_unlock(idx); | |
57c2590f TH |
1972 | if (tomoyo_profile_version != 20090903) |
1973 | panic("Profile version %u is not supported.\n", | |
1974 | tomoyo_profile_version); | |
1975 | printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n"); | |
c3ef1500 | 1976 | printk(KERN_INFO "Mandatory Access Control activated.\n"); |
9590837b | 1977 | } |