Commit | Line | Data |
---|---|---|
26a2a1c9 KT |
1 | /* |
2 | * security/tomoyo/domain.c | |
3 | * | |
c3ef1500 | 4 | * Domain transition functions for TOMOYO. |
26a2a1c9 | 5 | * |
c3ef1500 | 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
26a2a1c9 KT |
7 | */ |
8 | ||
9 | #include "common.h" | |
26a2a1c9 | 10 | #include <linux/binfmts.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
26a2a1c9 KT |
12 | |
13 | /* Variables definitions.*/ | |
14 | ||
15 | /* The initial domain. */ | |
16 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
17 | ||
237ab459 TH |
18 | /** |
19 | * tomoyo_update_domain - Update an entry for domain policy. | |
20 | * | |
21 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
22 | * @size: Size of @new_entry in bytes. | |
23 | * @is_delete: True if it is a delete request. | |
24 | * @domain: Pointer to "struct tomoyo_domain_info". | |
25 | * @check_duplicate: Callback function to find duplicated entry. | |
26 | * @merge_duplicate: Callback function to merge duplicated entry. | |
27 | * | |
28 | * Returns 0 on success, negative value otherwise. | |
29 | * | |
30 | * Caller holds tomoyo_read_lock(). | |
31 | */ | |
32 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
33 | bool is_delete, struct tomoyo_domain_info *domain, | |
34 | bool (*check_duplicate) (const struct tomoyo_acl_info | |
35 | *, | |
36 | const struct tomoyo_acl_info | |
37 | *), | |
38 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
39 | struct tomoyo_acl_info *, | |
40 | const bool)) | |
41 | { | |
42 | int error = is_delete ? -ENOENT : -ENOMEM; | |
43 | struct tomoyo_acl_info *entry; | |
44 | ||
45 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
46 | return error; | |
47 | list_for_each_entry_rcu(entry, &domain->acl_info_list, list) { | |
48 | if (!check_duplicate(entry, new_entry)) | |
49 | continue; | |
50 | if (merge_duplicate) | |
51 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
52 | is_delete); | |
53 | else | |
54 | entry->is_deleted = is_delete; | |
55 | error = 0; | |
56 | break; | |
57 | } | |
58 | if (error && !is_delete) { | |
59 | entry = tomoyo_commit_ok(new_entry, size); | |
60 | if (entry) { | |
61 | list_add_tail_rcu(&entry->list, &domain->acl_info_list); | |
62 | error = 0; | |
63 | } | |
64 | } | |
65 | mutex_unlock(&tomoyo_policy_lock); | |
66 | return error; | |
67 | } | |
68 | ||
c3fa109a TH |
69 | /* |
70 | * tomoyo_domain_list is used for holding list of domains. | |
71 | * The ->acl_info_list of "struct tomoyo_domain_info" is used for holding | |
72 | * permissions (e.g. "allow_read /lib/libc-2.5.so") given to each domain. | |
73 | * | |
74 | * An entry is added by | |
75 | * | |
76 | * # ( echo "<kernel>"; echo "allow_execute /sbin/init" ) > \ | |
77 | * /sys/kernel/security/tomoyo/domain_policy | |
78 | * | |
79 | * and is deleted by | |
80 | * | |
81 | * # ( echo "<kernel>"; echo "delete allow_execute /sbin/init" ) > \ | |
82 | * /sys/kernel/security/tomoyo/domain_policy | |
83 | * | |
84 | * and all entries are retrieved by | |
85 | * | |
86 | * # cat /sys/kernel/security/tomoyo/domain_policy | |
87 | * | |
88 | * A domain is added by | |
89 | * | |
90 | * # echo "<kernel>" > /sys/kernel/security/tomoyo/domain_policy | |
91 | * | |
92 | * and is deleted by | |
93 | * | |
94 | * # echo "delete <kernel>" > /sys/kernel/security/tomoyo/domain_policy | |
95 | * | |
96 | * and all domains are retrieved by | |
97 | * | |
98 | * # grep '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | |
99 | * | |
100 | * Normally, a domainname is monotonically getting longer because a domainname | |
101 | * which the process will belong to if an execve() operation succeeds is | |
102 | * defined as a concatenation of "current domainname" + "pathname passed to | |
103 | * execve()". | |
104 | * See tomoyo_domain_initializer_list and tomoyo_domain_keeper_list for | |
105 | * exceptions. | |
106 | */ | |
26a2a1c9 | 107 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 108 | |
26a2a1c9 KT |
109 | /** |
110 | * tomoyo_get_last_name - Get last component of a domainname. | |
111 | * | |
112 | * @domain: Pointer to "struct tomoyo_domain_info". | |
113 | * | |
114 | * Returns the last component of the domainname. | |
115 | */ | |
116 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) | |
117 | { | |
118 | const char *cp0 = domain->domainname->name; | |
119 | const char *cp1 = strrchr(cp0, ' '); | |
120 | ||
121 | if (cp1) | |
122 | return cp1 + 1; | |
123 | return cp0; | |
124 | } | |
125 | ||
c3fa109a TH |
126 | /* |
127 | * tomoyo_domain_initializer_list is used for holding list of programs which | |
128 | * triggers reinitialization of domainname. Normally, a domainname is | |
129 | * monotonically getting longer. But sometimes, we restart daemon programs. | |
130 | * It would be convenient for us that "a daemon started upon system boot" and | |
131 | * "the daemon restarted from console" belong to the same domain. Thus, TOMOYO | |
132 | * provides a way to shorten domainnames. | |
133 | * | |
134 | * An entry is added by | |
135 | * | |
136 | * # echo 'initialize_domain /usr/sbin/httpd' > \ | |
137 | * /sys/kernel/security/tomoyo/exception_policy | |
138 | * | |
139 | * and is deleted by | |
140 | * | |
141 | * # echo 'delete initialize_domain /usr/sbin/httpd' > \ | |
142 | * /sys/kernel/security/tomoyo/exception_policy | |
143 | * | |
144 | * and all entries are retrieved by | |
145 | * | |
146 | * # grep ^initialize_domain /sys/kernel/security/tomoyo/exception_policy | |
147 | * | |
148 | * In the example above, /usr/sbin/httpd will belong to | |
149 | * "<kernel> /usr/sbin/httpd" domain. | |
150 | * | |
151 | * You may specify a domainname using "from" keyword. | |
152 | * "initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" | |
153 | * will cause "/usr/sbin/httpd" executed from "<kernel> /etc/rc.d/init.d/httpd" | |
154 | * domain to belong to "<kernel> /usr/sbin/httpd" domain. | |
155 | * | |
156 | * You may add "no_" prefix to "initialize_domain". | |
157 | * "initialize_domain /usr/sbin/httpd" and | |
158 | * "no_initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" | |
159 | * will cause "/usr/sbin/httpd" to belong to "<kernel> /usr/sbin/httpd" domain | |
160 | * unless executed from "<kernel> /etc/rc.d/init.d/httpd" domain. | |
161 | */ | |
847b173e | 162 | LIST_HEAD(tomoyo_domain_initializer_list); |
26a2a1c9 KT |
163 | |
164 | /** | |
165 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. | |
166 | * | |
167 | * @domainname: The name of domain. May be NULL. | |
168 | * @program: The name of program. | |
169 | * @is_not: True if it is "no_initialize_domain" entry. | |
170 | * @is_delete: True if it is a delete request. | |
171 | * | |
172 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
173 | * |
174 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
175 | */ |
176 | static int tomoyo_update_domain_initializer_entry(const char *domainname, | |
177 | const char *program, | |
178 | const bool is_not, | |
179 | const bool is_delete) | |
180 | { | |
26a2a1c9 | 181 | struct tomoyo_domain_initializer_entry *ptr; |
9e4b50e9 | 182 | struct tomoyo_domain_initializer_entry e = { .is_not = is_not }; |
ca0b7df3 | 183 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 | 184 | |
3f629636 TH |
185 | if (!tomoyo_is_correct_path(program)) |
186 | return -EINVAL; | |
26a2a1c9 KT |
187 | if (domainname) { |
188 | if (!tomoyo_is_domain_def(domainname) && | |
3f629636 | 189 | tomoyo_is_correct_path(domainname)) |
9e4b50e9 | 190 | e.is_last_name = true; |
17080008 | 191 | else if (!tomoyo_is_correct_domain(domainname)) |
26a2a1c9 | 192 | return -EINVAL; |
9e4b50e9 TH |
193 | e.domainname = tomoyo_get_name(domainname); |
194 | if (!e.domainname) | |
ca0b7df3 | 195 | goto out; |
26a2a1c9 | 196 | } |
9e4b50e9 TH |
197 | e.program = tomoyo_get_name(program); |
198 | if (!e.program) | |
ca0b7df3 | 199 | goto out; |
29282381 TH |
200 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
201 | goto out; | |
fdb8ebb7 | 202 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
9e4b50e9 | 203 | if (!tomoyo_is_same_domain_initializer_entry(ptr, &e)) |
26a2a1c9 KT |
204 | continue; |
205 | ptr->is_deleted = is_delete; | |
206 | error = 0; | |
ca0b7df3 | 207 | break; |
26a2a1c9 | 208 | } |
9e4b50e9 TH |
209 | if (!is_delete && error) { |
210 | struct tomoyo_domain_initializer_entry *entry = | |
211 | tomoyo_commit_ok(&e, sizeof(e)); | |
212 | if (entry) { | |
213 | list_add_tail_rcu(&entry->list, | |
214 | &tomoyo_domain_initializer_list); | |
215 | error = 0; | |
216 | } | |
26a2a1c9 | 217 | } |
f737d95d | 218 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 219 | out: |
9e4b50e9 TH |
220 | tomoyo_put_name(e.domainname); |
221 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
222 | return error; |
223 | } | |
224 | ||
225 | /** | |
226 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. | |
227 | * | |
228 | * @head: Pointer to "struct tomoyo_io_buffer". | |
229 | * | |
230 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
231 | * |
232 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
233 | */ |
234 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) | |
235 | { | |
236 | struct list_head *pos; | |
237 | bool done = true; | |
238 | ||
26a2a1c9 KT |
239 | list_for_each_cookie(pos, head->read_var2, |
240 | &tomoyo_domain_initializer_list) { | |
241 | const char *no; | |
242 | const char *from = ""; | |
243 | const char *domain = ""; | |
244 | struct tomoyo_domain_initializer_entry *ptr; | |
245 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, | |
246 | list); | |
247 | if (ptr->is_deleted) | |
248 | continue; | |
249 | no = ptr->is_not ? "no_" : ""; | |
250 | if (ptr->domainname) { | |
251 | from = " from "; | |
252 | domain = ptr->domainname->name; | |
253 | } | |
7d2948b1 TH |
254 | done = tomoyo_io_printf(head, |
255 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN | |
256 | "%s%s%s\n", no, ptr->program->name, | |
257 | from, domain); | |
258 | if (!done) | |
26a2a1c9 | 259 | break; |
26a2a1c9 | 260 | } |
26a2a1c9 KT |
261 | return done; |
262 | } | |
263 | ||
264 | /** | |
265 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. | |
266 | * | |
267 | * @data: String to parse. | |
268 | * @is_not: True if it is "no_initialize_domain" entry. | |
269 | * @is_delete: True if it is a delete request. | |
270 | * | |
271 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
272 | * |
273 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
274 | */ |
275 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
276 | const bool is_delete) | |
277 | { | |
278 | char *cp = strstr(data, " from "); | |
279 | ||
280 | if (cp) { | |
281 | *cp = '\0'; | |
282 | return tomoyo_update_domain_initializer_entry(cp + 6, data, | |
283 | is_not, | |
284 | is_delete); | |
285 | } | |
286 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, | |
287 | is_delete); | |
288 | } | |
289 | ||
290 | /** | |
291 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. | |
292 | * | |
293 | * @domainname: The name of domain. | |
294 | * @program: The name of program. | |
295 | * @last_name: The last component of @domainname. | |
296 | * | |
297 | * Returns true if executing @program reinitializes domain transition, | |
298 | * false otherwise. | |
fdb8ebb7 TH |
299 | * |
300 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
301 | */ |
302 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * | |
303 | domainname, | |
304 | const struct tomoyo_path_info *program, | |
305 | const struct tomoyo_path_info * | |
306 | last_name) | |
307 | { | |
308 | struct tomoyo_domain_initializer_entry *ptr; | |
309 | bool flag = false; | |
310 | ||
fdb8ebb7 | 311 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
26a2a1c9 KT |
312 | if (ptr->is_deleted) |
313 | continue; | |
314 | if (ptr->domainname) { | |
315 | if (!ptr->is_last_name) { | |
316 | if (ptr->domainname != domainname) | |
317 | continue; | |
318 | } else { | |
319 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
320 | continue; | |
321 | } | |
322 | } | |
323 | if (tomoyo_pathcmp(ptr->program, program)) | |
324 | continue; | |
325 | if (ptr->is_not) { | |
326 | flag = false; | |
327 | break; | |
328 | } | |
329 | flag = true; | |
330 | } | |
26a2a1c9 KT |
331 | return flag; |
332 | } | |
333 | ||
c3fa109a TH |
334 | /* |
335 | * tomoyo_domain_keeper_list is used for holding list of domainnames which | |
336 | * suppresses domain transition. Normally, a domainname is monotonically | |
337 | * getting longer. But sometimes, we want to suppress domain transition. | |
338 | * It would be convenient for us that programs executed from a login session | |
339 | * belong to the same domain. Thus, TOMOYO provides a way to suppress domain | |
340 | * transition. | |
341 | * | |
342 | * An entry is added by | |
343 | * | |
344 | * # echo 'keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ | |
345 | * /sys/kernel/security/tomoyo/exception_policy | |
346 | * | |
347 | * and is deleted by | |
348 | * | |
349 | * # echo 'delete keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ | |
350 | * /sys/kernel/security/tomoyo/exception_policy | |
351 | * | |
352 | * and all entries are retrieved by | |
353 | * | |
354 | * # grep ^keep_domain /sys/kernel/security/tomoyo/exception_policy | |
355 | * | |
356 | * In the example above, any process which belongs to | |
357 | * "<kernel> /usr/sbin/sshd /bin/bash" domain will remain in that domain, | |
358 | * unless explicitly specified by "initialize_domain" or "no_keep_domain". | |
359 | * | |
360 | * You may specify a program using "from" keyword. | |
361 | * "keep_domain /bin/pwd from <kernel> /usr/sbin/sshd /bin/bash" | |
362 | * will cause "/bin/pwd" executed from "<kernel> /usr/sbin/sshd /bin/bash" | |
363 | * domain to remain in "<kernel> /usr/sbin/sshd /bin/bash" domain. | |
364 | * | |
365 | * You may add "no_" prefix to "keep_domain". | |
366 | * "keep_domain <kernel> /usr/sbin/sshd /bin/bash" and | |
367 | * "no_keep_domain /usr/bin/passwd from <kernel> /usr/sbin/sshd /bin/bash" will | |
368 | * cause "/usr/bin/passwd" to belong to | |
369 | * "<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain, unless | |
370 | * explicitly specified by "initialize_domain". | |
371 | */ | |
847b173e | 372 | LIST_HEAD(tomoyo_domain_keeper_list); |
26a2a1c9 KT |
373 | |
374 | /** | |
375 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. | |
376 | * | |
377 | * @domainname: The name of domain. | |
378 | * @program: The name of program. May be NULL. | |
379 | * @is_not: True if it is "no_keep_domain" entry. | |
380 | * @is_delete: True if it is a delete request. | |
381 | * | |
382 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
383 | * |
384 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
385 | */ |
386 | static int tomoyo_update_domain_keeper_entry(const char *domainname, | |
387 | const char *program, | |
388 | const bool is_not, | |
389 | const bool is_delete) | |
390 | { | |
26a2a1c9 | 391 | struct tomoyo_domain_keeper_entry *ptr; |
9e4b50e9 | 392 | struct tomoyo_domain_keeper_entry e = { .is_not = is_not }; |
ca0b7df3 | 393 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 KT |
394 | |
395 | if (!tomoyo_is_domain_def(domainname) && | |
3f629636 | 396 | tomoyo_is_correct_path(domainname)) |
9e4b50e9 | 397 | e.is_last_name = true; |
17080008 | 398 | else if (!tomoyo_is_correct_domain(domainname)) |
26a2a1c9 KT |
399 | return -EINVAL; |
400 | if (program) { | |
3f629636 | 401 | if (!tomoyo_is_correct_path(program)) |
26a2a1c9 | 402 | return -EINVAL; |
9e4b50e9 TH |
403 | e.program = tomoyo_get_name(program); |
404 | if (!e.program) | |
ca0b7df3 | 405 | goto out; |
26a2a1c9 | 406 | } |
9e4b50e9 TH |
407 | e.domainname = tomoyo_get_name(domainname); |
408 | if (!e.domainname) | |
ca0b7df3 | 409 | goto out; |
29282381 TH |
410 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
411 | goto out; | |
fdb8ebb7 | 412 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
9e4b50e9 | 413 | if (!tomoyo_is_same_domain_keeper_entry(ptr, &e)) |
26a2a1c9 KT |
414 | continue; |
415 | ptr->is_deleted = is_delete; | |
416 | error = 0; | |
ca0b7df3 | 417 | break; |
26a2a1c9 | 418 | } |
9e4b50e9 TH |
419 | if (!is_delete && error) { |
420 | struct tomoyo_domain_keeper_entry *entry = | |
421 | tomoyo_commit_ok(&e, sizeof(e)); | |
422 | if (entry) { | |
423 | list_add_tail_rcu(&entry->list, | |
424 | &tomoyo_domain_keeper_list); | |
425 | error = 0; | |
426 | } | |
26a2a1c9 | 427 | } |
f737d95d | 428 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 429 | out: |
9e4b50e9 TH |
430 | tomoyo_put_name(e.domainname); |
431 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
432 | return error; |
433 | } | |
434 | ||
435 | /** | |
436 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. | |
437 | * | |
438 | * @data: String to parse. | |
439 | * @is_not: True if it is "no_keep_domain" entry. | |
440 | * @is_delete: True if it is a delete request. | |
441 | * | |
fdb8ebb7 | 442 | * Caller holds tomoyo_read_lock(). |
26a2a1c9 KT |
443 | */ |
444 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
445 | const bool is_delete) | |
446 | { | |
447 | char *cp = strstr(data, " from "); | |
448 | ||
449 | if (cp) { | |
450 | *cp = '\0'; | |
451 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, | |
452 | is_delete); | |
453 | } | |
454 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); | |
455 | } | |
456 | ||
457 | /** | |
458 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. | |
459 | * | |
460 | * @head: Pointer to "struct tomoyo_io_buffer". | |
461 | * | |
462 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
463 | * |
464 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
465 | */ |
466 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) | |
467 | { | |
468 | struct list_head *pos; | |
33043cbb | 469 | bool done = true; |
26a2a1c9 | 470 | |
26a2a1c9 KT |
471 | list_for_each_cookie(pos, head->read_var2, |
472 | &tomoyo_domain_keeper_list) { | |
473 | struct tomoyo_domain_keeper_entry *ptr; | |
474 | const char *no; | |
475 | const char *from = ""; | |
476 | const char *program = ""; | |
477 | ||
478 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); | |
479 | if (ptr->is_deleted) | |
480 | continue; | |
481 | no = ptr->is_not ? "no_" : ""; | |
482 | if (ptr->program) { | |
483 | from = " from "; | |
484 | program = ptr->program->name; | |
485 | } | |
7d2948b1 TH |
486 | done = tomoyo_io_printf(head, |
487 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN | |
488 | "%s%s%s\n", no, program, from, | |
489 | ptr->domainname->name); | |
490 | if (!done) | |
26a2a1c9 | 491 | break; |
26a2a1c9 | 492 | } |
26a2a1c9 KT |
493 | return done; |
494 | } | |
495 | ||
496 | /** | |
497 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. | |
498 | * | |
499 | * @domainname: The name of domain. | |
500 | * @program: The name of program. | |
501 | * @last_name: The last component of @domainname. | |
502 | * | |
503 | * Returns true if executing @program supresses domain transition, | |
504 | * false otherwise. | |
fdb8ebb7 TH |
505 | * |
506 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
507 | */ |
508 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, | |
509 | const struct tomoyo_path_info *program, | |
510 | const struct tomoyo_path_info *last_name) | |
511 | { | |
512 | struct tomoyo_domain_keeper_entry *ptr; | |
513 | bool flag = false; | |
514 | ||
fdb8ebb7 | 515 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
26a2a1c9 KT |
516 | if (ptr->is_deleted) |
517 | continue; | |
518 | if (!ptr->is_last_name) { | |
519 | if (ptr->domainname != domainname) | |
520 | continue; | |
521 | } else { | |
522 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
523 | continue; | |
524 | } | |
525 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) | |
526 | continue; | |
527 | if (ptr->is_not) { | |
528 | flag = false; | |
529 | break; | |
530 | } | |
531 | flag = true; | |
532 | } | |
26a2a1c9 KT |
533 | return flag; |
534 | } | |
535 | ||
1084307c TH |
536 | /* |
537 | * tomoyo_aggregator_list is used for holding list of rewrite table for | |
538 | * execve() request. Some programs provides similar functionality. This keyword | |
539 | * allows users to aggregate such programs. | |
540 | * | |
541 | * Entries are added by | |
542 | * | |
543 | * # echo 'aggregator /usr/bin/vi /./editor' > \ | |
544 | * /sys/kernel/security/tomoyo/exception_policy | |
545 | * # echo 'aggregator /usr/bin/emacs /./editor' > \ | |
546 | * /sys/kernel/security/tomoyo/exception_policy | |
547 | * | |
548 | * and are deleted by | |
549 | * | |
550 | * # echo 'delete aggregator /usr/bin/vi /./editor' > \ | |
551 | * /sys/kernel/security/tomoyo/exception_policy | |
552 | * # echo 'delete aggregator /usr/bin/emacs /./editor' > \ | |
553 | * /sys/kernel/security/tomoyo/exception_policy | |
554 | * | |
555 | * and all entries are retrieved by | |
556 | * | |
557 | * # grep ^aggregator /sys/kernel/security/tomoyo/exception_policy | |
558 | * | |
559 | * In the example above, if /usr/bin/vi or /usr/bin/emacs are executed, | |
560 | * permission is checked for /./editor and domainname which the current process | |
561 | * will belong to after execve() succeeds is calculated using /./editor . | |
562 | */ | |
563 | LIST_HEAD(tomoyo_aggregator_list); | |
564 | ||
565 | /** | |
566 | * tomoyo_update_aggregator_entry - Update "struct tomoyo_aggregator_entry" list. | |
567 | * | |
568 | * @original_name: The original program's name. | |
569 | * @aggregated_name: The program name to use. | |
570 | * @is_delete: True if it is a delete request. | |
571 | * | |
572 | * Returns 0 on success, negative value otherwise. | |
573 | * | |
574 | * Caller holds tomoyo_read_lock(). | |
575 | */ | |
576 | static int tomoyo_update_aggregator_entry(const char *original_name, | |
577 | const char *aggregated_name, | |
578 | const bool is_delete) | |
579 | { | |
580 | struct tomoyo_aggregator_entry *ptr; | |
581 | struct tomoyo_aggregator_entry e = { }; | |
582 | int error = is_delete ? -ENOENT : -ENOMEM; | |
583 | ||
584 | if (!tomoyo_is_correct_path(original_name) || | |
585 | !tomoyo_is_correct_path(aggregated_name)) | |
586 | return -EINVAL; | |
587 | e.original_name = tomoyo_get_name(original_name); | |
588 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
589 | if (!e.original_name || !e.aggregated_name || | |
590 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
591 | goto out; | |
592 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
593 | goto out; | |
594 | list_for_each_entry_rcu(ptr, &tomoyo_aggregator_list, list) { | |
595 | if (!tomoyo_is_same_aggregator_entry(ptr, &e)) | |
596 | continue; | |
597 | ptr->is_deleted = is_delete; | |
598 | error = 0; | |
599 | break; | |
600 | } | |
601 | if (!is_delete && error) { | |
602 | struct tomoyo_aggregator_entry *entry = | |
603 | tomoyo_commit_ok(&e, sizeof(e)); | |
604 | if (entry) { | |
605 | list_add_tail_rcu(&entry->list, | |
606 | &tomoyo_aggregator_list); | |
607 | error = 0; | |
608 | } | |
609 | } | |
610 | mutex_unlock(&tomoyo_policy_lock); | |
611 | out: | |
612 | tomoyo_put_name(e.original_name); | |
613 | tomoyo_put_name(e.aggregated_name); | |
614 | return error; | |
615 | } | |
616 | ||
617 | /** | |
618 | * tomoyo_read_aggregator_policy - Read "struct tomoyo_aggregator_entry" list. | |
619 | * | |
620 | * @head: Pointer to "struct tomoyo_io_buffer". | |
621 | * | |
622 | * Returns true on success, false otherwise. | |
623 | * | |
624 | * Caller holds tomoyo_read_lock(). | |
625 | */ | |
626 | bool tomoyo_read_aggregator_policy(struct tomoyo_io_buffer *head) | |
627 | { | |
628 | struct list_head *pos; | |
629 | bool done = true; | |
630 | ||
631 | list_for_each_cookie(pos, head->read_var2, &tomoyo_aggregator_list) { | |
632 | struct tomoyo_aggregator_entry *ptr; | |
633 | ||
634 | ptr = list_entry(pos, struct tomoyo_aggregator_entry, list); | |
635 | if (ptr->is_deleted) | |
636 | continue; | |
637 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_AGGREGATOR | |
638 | "%s %s\n", ptr->original_name->name, | |
639 | ptr->aggregated_name->name); | |
640 | if (!done) | |
641 | break; | |
642 | } | |
643 | return done; | |
644 | } | |
645 | ||
646 | /** | |
647 | * tomoyo_write_aggregator_policy - Write "struct tomoyo_aggregator_entry" list. | |
648 | * | |
649 | * @data: String to parse. | |
650 | * @is_delete: True if it is a delete request. | |
651 | * | |
652 | * Returns 0 on success, negative value otherwise. | |
653 | * | |
654 | * Caller holds tomoyo_read_lock(). | |
655 | */ | |
656 | int tomoyo_write_aggregator_policy(char *data, const bool is_delete) | |
657 | { | |
658 | char *cp = strchr(data, ' '); | |
659 | ||
660 | if (!cp) | |
661 | return -EINVAL; | |
662 | *cp++ = '\0'; | |
663 | return tomoyo_update_aggregator_entry(data, cp, is_delete); | |
664 | } | |
665 | ||
c3fa109a TH |
666 | /* |
667 | * tomoyo_alias_list is used for holding list of symlink's pathnames which are | |
668 | * allowed to be passed to an execve() request. Normally, the domainname which | |
669 | * the current process will belong to after execve() succeeds is calculated | |
670 | * using dereferenced pathnames. But some programs behave differently depending | |
671 | * on the name passed to argv[0]. For busybox, calculating domainname using | |
672 | * dereferenced pathnames will cause all programs in the busybox to belong to | |
673 | * the same domain. Thus, TOMOYO provides a way to allow use of symlink's | |
674 | * pathname for checking execve()'s permission and calculating domainname which | |
675 | * the current process will belong to after execve() succeeds. | |
676 | * | |
677 | * An entry is added by | |
678 | * | |
679 | * # echo 'alias /bin/busybox /bin/cat' > \ | |
680 | * /sys/kernel/security/tomoyo/exception_policy | |
681 | * | |
682 | * and is deleted by | |
683 | * | |
684 | * # echo 'delete alias /bin/busybox /bin/cat' > \ | |
685 | * /sys/kernel/security/tomoyo/exception_policy | |
686 | * | |
687 | * and all entries are retrieved by | |
688 | * | |
689 | * # grep ^alias /sys/kernel/security/tomoyo/exception_policy | |
690 | * | |
691 | * In the example above, if /bin/cat is a symlink to /bin/busybox and execution | |
692 | * of /bin/cat is requested, permission is checked for /bin/cat rather than | |
693 | * /bin/busybox and domainname which the current process will belong to after | |
694 | * execve() succeeds is calculated using /bin/cat rather than /bin/busybox . | |
695 | */ | |
847b173e | 696 | LIST_HEAD(tomoyo_alias_list); |
26a2a1c9 KT |
697 | |
698 | /** | |
699 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. | |
700 | * | |
701 | * @original_name: The original program's real name. | |
702 | * @aliased_name: The symbolic program's symbolic link's name. | |
703 | * @is_delete: True if it is a delete request. | |
704 | * | |
705 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
706 | * |
707 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
708 | */ |
709 | static int tomoyo_update_alias_entry(const char *original_name, | |
710 | const char *aliased_name, | |
711 | const bool is_delete) | |
712 | { | |
26a2a1c9 | 713 | struct tomoyo_alias_entry *ptr; |
9e4b50e9 | 714 | struct tomoyo_alias_entry e = { }; |
ca0b7df3 | 715 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 | 716 | |
3f629636 TH |
717 | if (!tomoyo_is_correct_path(original_name) || |
718 | !tomoyo_is_correct_path(aliased_name)) | |
719 | return -EINVAL; | |
9e4b50e9 TH |
720 | e.original_name = tomoyo_get_name(original_name); |
721 | e.aliased_name = tomoyo_get_name(aliased_name); | |
3f629636 TH |
722 | if (!e.original_name || !e.aliased_name || |
723 | e.original_name->is_patterned || e.aliased_name->is_patterned) | |
724 | goto out; /* No patterns allowed. */ | |
29282381 TH |
725 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
726 | goto out; | |
fdb8ebb7 | 727 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
9e4b50e9 | 728 | if (!tomoyo_is_same_alias_entry(ptr, &e)) |
26a2a1c9 KT |
729 | continue; |
730 | ptr->is_deleted = is_delete; | |
731 | error = 0; | |
ca0b7df3 | 732 | break; |
26a2a1c9 | 733 | } |
9e4b50e9 TH |
734 | if (!is_delete && error) { |
735 | struct tomoyo_alias_entry *entry = | |
736 | tomoyo_commit_ok(&e, sizeof(e)); | |
737 | if (entry) { | |
738 | list_add_tail_rcu(&entry->list, &tomoyo_alias_list); | |
739 | error = 0; | |
740 | } | |
26a2a1c9 | 741 | } |
f737d95d | 742 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 743 | out: |
9e4b50e9 TH |
744 | tomoyo_put_name(e.original_name); |
745 | tomoyo_put_name(e.aliased_name); | |
26a2a1c9 KT |
746 | return error; |
747 | } | |
748 | ||
749 | /** | |
750 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. | |
751 | * | |
752 | * @head: Pointer to "struct tomoyo_io_buffer". | |
753 | * | |
754 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
755 | * |
756 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
757 | */ |
758 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) | |
759 | { | |
760 | struct list_head *pos; | |
761 | bool done = true; | |
762 | ||
26a2a1c9 KT |
763 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { |
764 | struct tomoyo_alias_entry *ptr; | |
765 | ||
766 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); | |
767 | if (ptr->is_deleted) | |
768 | continue; | |
7d2948b1 TH |
769 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
770 | ptr->original_name->name, | |
771 | ptr->aliased_name->name); | |
772 | if (!done) | |
26a2a1c9 | 773 | break; |
26a2a1c9 | 774 | } |
26a2a1c9 KT |
775 | return done; |
776 | } | |
777 | ||
778 | /** | |
779 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. | |
780 | * | |
781 | * @data: String to parse. | |
782 | * @is_delete: True if it is a delete request. | |
783 | * | |
784 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
785 | * |
786 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
787 | */ |
788 | int tomoyo_write_alias_policy(char *data, const bool is_delete) | |
789 | { | |
790 | char *cp = strchr(data, ' '); | |
791 | ||
792 | if (!cp) | |
793 | return -EINVAL; | |
794 | *cp++ = '\0'; | |
795 | return tomoyo_update_alias_entry(data, cp, is_delete); | |
796 | } | |
797 | ||
26a2a1c9 KT |
798 | /** |
799 | * tomoyo_find_or_assign_new_domain - Create a domain. | |
800 | * | |
801 | * @domainname: The name of domain. | |
802 | * @profile: Profile number to assign if the domain was newly created. | |
803 | * | |
804 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
fdb8ebb7 TH |
805 | * |
806 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
807 | */ |
808 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
809 | domainname, | |
810 | const u8 profile) | |
811 | { | |
ca0b7df3 | 812 | struct tomoyo_domain_info *entry; |
29282381 | 813 | struct tomoyo_domain_info *domain = NULL; |
26a2a1c9 | 814 | const struct tomoyo_path_info *saved_domainname; |
ca0b7df3 | 815 | bool found = false; |
26a2a1c9 | 816 | |
17080008 | 817 | if (!tomoyo_is_correct_domain(domainname)) |
ca0b7df3 | 818 | return NULL; |
bf24fb01 | 819 | saved_domainname = tomoyo_get_name(domainname); |
26a2a1c9 | 820 | if (!saved_domainname) |
ca0b7df3 | 821 | return NULL; |
4e5d6f7e | 822 | entry = kzalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
823 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
824 | goto out; | |
ca0b7df3 TH |
825 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
826 | if (domain->is_deleted || | |
827 | tomoyo_pathcmp(saved_domainname, domain->domainname)) | |
828 | continue; | |
829 | found = true; | |
830 | break; | |
831 | } | |
832 | if (!found && tomoyo_memory_ok(entry)) { | |
833 | INIT_LIST_HEAD(&entry->acl_info_list); | |
834 | entry->domainname = saved_domainname; | |
bf24fb01 | 835 | saved_domainname = NULL; |
ca0b7df3 TH |
836 | entry->profile = profile; |
837 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
838 | domain = entry; | |
839 | entry = NULL; | |
840 | found = true; | |
26a2a1c9 | 841 | } |
f737d95d | 842 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 843 | out: |
bf24fb01 | 844 | tomoyo_put_name(saved_domainname); |
ca0b7df3 TH |
845 | kfree(entry); |
846 | return found ? domain : NULL; | |
26a2a1c9 KT |
847 | } |
848 | ||
849 | /** | |
850 | * tomoyo_find_next_domain - Find a domain. | |
851 | * | |
56f8c9bc | 852 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
853 | * |
854 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
855 | * |
856 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 857 | */ |
56f8c9bc | 858 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 859 | { |
17fcfbd9 | 860 | struct tomoyo_request_info r; |
c8c57e84 | 861 | char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); |
26a2a1c9 KT |
862 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
863 | struct tomoyo_domain_info *domain = NULL; | |
864 | const char *old_domain_name = old_domain->domainname->name; | |
865 | const char *original_name = bprm->filename; | |
57c2590f TH |
866 | u8 mode; |
867 | bool is_enforce; | |
26a2a1c9 | 868 | int retval = -ENOMEM; |
c8c57e84 TH |
869 | bool need_kfree = false; |
870 | struct tomoyo_path_info rn = { }; /* real name */ | |
871 | struct tomoyo_path_info sn = { }; /* symlink name */ | |
17fcfbd9 | 872 | struct tomoyo_path_info ln; /* last name */ |
26a2a1c9 | 873 | |
c8c57e84 TH |
874 | ln.name = tomoyo_get_last_name(old_domain); |
875 | tomoyo_fill_path_info(&ln); | |
57c2590f TH |
876 | mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE); |
877 | is_enforce = (mode == TOMOYO_CONFIG_ENFORCING); | |
26a2a1c9 KT |
878 | if (!tmp) |
879 | goto out; | |
880 | ||
17fcfbd9 | 881 | retry: |
c8c57e84 TH |
882 | if (need_kfree) { |
883 | kfree(rn.name); | |
884 | need_kfree = false; | |
885 | } | |
26a2a1c9 KT |
886 | /* Get tomoyo_realpath of program. */ |
887 | retval = -ENOENT; | |
c8c57e84 TH |
888 | rn.name = tomoyo_realpath(original_name); |
889 | if (!rn.name) | |
26a2a1c9 | 890 | goto out; |
c8c57e84 TH |
891 | tomoyo_fill_path_info(&rn); |
892 | need_kfree = true; | |
893 | ||
26a2a1c9 | 894 | /* Get tomoyo_realpath of symbolic link. */ |
c8c57e84 TH |
895 | sn.name = tomoyo_realpath_nofollow(original_name); |
896 | if (!sn.name) | |
26a2a1c9 | 897 | goto out; |
17fcfbd9 | 898 | tomoyo_fill_path_info(&sn); |
26a2a1c9 KT |
899 | |
900 | /* Check 'alias' directive. */ | |
17fcfbd9 | 901 | if (tomoyo_pathcmp(&rn, &sn)) { |
26a2a1c9 KT |
902 | struct tomoyo_alias_entry *ptr; |
903 | /* Is this program allowed to be called via symbolic links? */ | |
fdb8ebb7 | 904 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
26a2a1c9 | 905 | if (ptr->is_deleted || |
17fcfbd9 TH |
906 | tomoyo_pathcmp(&rn, ptr->original_name) || |
907 | tomoyo_pathcmp(&sn, ptr->aliased_name)) | |
26a2a1c9 | 908 | continue; |
c8c57e84 TH |
909 | kfree(rn.name); |
910 | need_kfree = false; | |
911 | /* This is OK because it is read only. */ | |
912 | rn = *ptr->aliased_name; | |
26a2a1c9 KT |
913 | break; |
914 | } | |
26a2a1c9 KT |
915 | } |
916 | ||
1084307c TH |
917 | /* Check 'aggregator' directive. */ |
918 | { | |
919 | struct tomoyo_aggregator_entry *ptr; | |
920 | list_for_each_entry_rcu(ptr, &tomoyo_aggregator_list, list) { | |
921 | if (ptr->is_deleted || | |
922 | !tomoyo_path_matches_pattern(&rn, | |
923 | ptr->original_name)) | |
924 | continue; | |
925 | if (need_kfree) | |
926 | kfree(rn.name); | |
927 | need_kfree = false; | |
928 | /* This is OK because it is read only. */ | |
929 | rn = *ptr->aggregated_name; | |
930 | break; | |
931 | } | |
932 | } | |
933 | ||
26a2a1c9 | 934 | /* Check execute permission. */ |
57c2590f | 935 | retval = tomoyo_check_exec_perm(&r, &rn); |
17fcfbd9 TH |
936 | if (retval == TOMOYO_RETRY_REQUEST) |
937 | goto retry; | |
26a2a1c9 KT |
938 | if (retval < 0) |
939 | goto out; | |
940 | ||
17fcfbd9 | 941 | if (tomoyo_is_domain_initializer(old_domain->domainname, &rn, &ln)) { |
26a2a1c9 | 942 | /* Transit to the child of tomoyo_kernel_domain domain. */ |
c8c57e84 TH |
943 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, |
944 | TOMOYO_ROOT_NAME " " "%s", rn.name); | |
26a2a1c9 KT |
945 | } else if (old_domain == &tomoyo_kernel_domain && |
946 | !tomoyo_policy_loaded) { | |
947 | /* | |
948 | * Needn't to transit from kernel domain before starting | |
949 | * /sbin/init. But transit from kernel domain if executing | |
950 | * initializers because they might start before /sbin/init. | |
951 | */ | |
952 | domain = old_domain; | |
17fcfbd9 | 953 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &rn, &ln)) { |
26a2a1c9 KT |
954 | /* Keep current domain. */ |
955 | domain = old_domain; | |
956 | } else { | |
957 | /* Normal domain transition. */ | |
c8c57e84 TH |
958 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, |
959 | "%s %s", old_domain_name, rn.name); | |
26a2a1c9 | 960 | } |
c8c57e84 | 961 | if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10) |
26a2a1c9 | 962 | goto done; |
c8c57e84 | 963 | domain = tomoyo_find_domain(tmp); |
26a2a1c9 KT |
964 | if (domain) |
965 | goto done; | |
17fcfbd9 TH |
966 | if (is_enforce) { |
967 | int error = tomoyo_supervisor(&r, "# wants to create domain\n" | |
c8c57e84 | 968 | "%s\n", tmp); |
17fcfbd9 TH |
969 | if (error == TOMOYO_RETRY_REQUEST) |
970 | goto retry; | |
971 | if (error < 0) | |
972 | goto done; | |
973 | } | |
c8c57e84 | 974 | domain = tomoyo_find_or_assign_new_domain(tmp, old_domain->profile); |
26a2a1c9 KT |
975 | done: |
976 | if (domain) | |
977 | goto out; | |
c8c57e84 | 978 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp); |
26a2a1c9 KT |
979 | if (is_enforce) |
980 | retval = -EPERM; | |
981 | else | |
ea13ddba | 982 | old_domain->transition_failed = true; |
26a2a1c9 | 983 | out: |
56f8c9bc TH |
984 | if (!domain) |
985 | domain = old_domain; | |
ec8e6a4e TH |
986 | /* Update reference count on "struct tomoyo_domain_info". */ |
987 | atomic_inc(&domain->users); | |
56f8c9bc | 988 | bprm->cred->security = domain; |
c8c57e84 TH |
989 | if (need_kfree) |
990 | kfree(rn.name); | |
991 | kfree(sn.name); | |
8e2d39a1 | 992 | kfree(tmp); |
26a2a1c9 KT |
993 | return retval; |
994 | } |