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 | ||
c3fa109a TH |
18 | /* |
19 | * tomoyo_domain_list is used for holding list of domains. | |
20 | * The ->acl_info_list of "struct tomoyo_domain_info" is used for holding | |
21 | * permissions (e.g. "allow_read /lib/libc-2.5.so") given to each domain. | |
22 | * | |
23 | * An entry is added by | |
24 | * | |
25 | * # ( echo "<kernel>"; echo "allow_execute /sbin/init" ) > \ | |
26 | * /sys/kernel/security/tomoyo/domain_policy | |
27 | * | |
28 | * and is deleted by | |
29 | * | |
30 | * # ( echo "<kernel>"; echo "delete allow_execute /sbin/init" ) > \ | |
31 | * /sys/kernel/security/tomoyo/domain_policy | |
32 | * | |
33 | * and all entries are retrieved by | |
34 | * | |
35 | * # cat /sys/kernel/security/tomoyo/domain_policy | |
36 | * | |
37 | * A domain is added by | |
38 | * | |
39 | * # echo "<kernel>" > /sys/kernel/security/tomoyo/domain_policy | |
40 | * | |
41 | * and is deleted by | |
42 | * | |
43 | * # echo "delete <kernel>" > /sys/kernel/security/tomoyo/domain_policy | |
44 | * | |
45 | * and all domains are retrieved by | |
46 | * | |
47 | * # grep '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | |
48 | * | |
49 | * Normally, a domainname is monotonically getting longer because a domainname | |
50 | * which the process will belong to if an execve() operation succeeds is | |
51 | * defined as a concatenation of "current domainname" + "pathname passed to | |
52 | * execve()". | |
53 | * See tomoyo_domain_initializer_list and tomoyo_domain_keeper_list for | |
54 | * exceptions. | |
55 | */ | |
26a2a1c9 | 56 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 57 | |
26a2a1c9 KT |
58 | /** |
59 | * tomoyo_get_last_name - Get last component of a domainname. | |
60 | * | |
61 | * @domain: Pointer to "struct tomoyo_domain_info". | |
62 | * | |
63 | * Returns the last component of the domainname. | |
64 | */ | |
65 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) | |
66 | { | |
67 | const char *cp0 = domain->domainname->name; | |
68 | const char *cp1 = strrchr(cp0, ' '); | |
69 | ||
70 | if (cp1) | |
71 | return cp1 + 1; | |
72 | return cp0; | |
73 | } | |
74 | ||
c3fa109a TH |
75 | /* |
76 | * tomoyo_domain_initializer_list is used for holding list of programs which | |
77 | * triggers reinitialization of domainname. Normally, a domainname is | |
78 | * monotonically getting longer. But sometimes, we restart daemon programs. | |
79 | * It would be convenient for us that "a daemon started upon system boot" and | |
80 | * "the daemon restarted from console" belong to the same domain. Thus, TOMOYO | |
81 | * provides a way to shorten domainnames. | |
82 | * | |
83 | * An entry is added by | |
84 | * | |
85 | * # echo 'initialize_domain /usr/sbin/httpd' > \ | |
86 | * /sys/kernel/security/tomoyo/exception_policy | |
87 | * | |
88 | * and is deleted by | |
89 | * | |
90 | * # echo 'delete initialize_domain /usr/sbin/httpd' > \ | |
91 | * /sys/kernel/security/tomoyo/exception_policy | |
92 | * | |
93 | * and all entries are retrieved by | |
94 | * | |
95 | * # grep ^initialize_domain /sys/kernel/security/tomoyo/exception_policy | |
96 | * | |
97 | * In the example above, /usr/sbin/httpd will belong to | |
98 | * "<kernel> /usr/sbin/httpd" domain. | |
99 | * | |
100 | * You may specify a domainname using "from" keyword. | |
101 | * "initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" | |
102 | * will cause "/usr/sbin/httpd" executed from "<kernel> /etc/rc.d/init.d/httpd" | |
103 | * domain to belong to "<kernel> /usr/sbin/httpd" domain. | |
104 | * | |
105 | * You may add "no_" prefix to "initialize_domain". | |
106 | * "initialize_domain /usr/sbin/httpd" and | |
107 | * "no_initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" | |
108 | * will cause "/usr/sbin/httpd" to belong to "<kernel> /usr/sbin/httpd" domain | |
109 | * unless executed from "<kernel> /etc/rc.d/init.d/httpd" domain. | |
110 | */ | |
847b173e | 111 | LIST_HEAD(tomoyo_domain_initializer_list); |
26a2a1c9 KT |
112 | |
113 | /** | |
114 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. | |
115 | * | |
116 | * @domainname: The name of domain. May be NULL. | |
117 | * @program: The name of program. | |
118 | * @is_not: True if it is "no_initialize_domain" entry. | |
119 | * @is_delete: True if it is a delete request. | |
120 | * | |
121 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
122 | * |
123 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
124 | */ |
125 | static int tomoyo_update_domain_initializer_entry(const char *domainname, | |
126 | const char *program, | |
127 | const bool is_not, | |
128 | const bool is_delete) | |
129 | { | |
26a2a1c9 | 130 | struct tomoyo_domain_initializer_entry *ptr; |
9e4b50e9 | 131 | struct tomoyo_domain_initializer_entry e = { .is_not = is_not }; |
ca0b7df3 | 132 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 | 133 | |
17080008 | 134 | if (!tomoyo_is_correct_path(program, 1, -1, -1)) |
26a2a1c9 KT |
135 | return -EINVAL; /* No patterns allowed. */ |
136 | if (domainname) { | |
137 | if (!tomoyo_is_domain_def(domainname) && | |
17080008 | 138 | tomoyo_is_correct_path(domainname, 1, -1, -1)) |
9e4b50e9 | 139 | e.is_last_name = true; |
17080008 | 140 | else if (!tomoyo_is_correct_domain(domainname)) |
26a2a1c9 | 141 | return -EINVAL; |
9e4b50e9 TH |
142 | e.domainname = tomoyo_get_name(domainname); |
143 | if (!e.domainname) | |
ca0b7df3 | 144 | goto out; |
26a2a1c9 | 145 | } |
9e4b50e9 TH |
146 | e.program = tomoyo_get_name(program); |
147 | if (!e.program) | |
ca0b7df3 | 148 | goto out; |
29282381 TH |
149 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
150 | goto out; | |
fdb8ebb7 | 151 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
9e4b50e9 | 152 | if (!tomoyo_is_same_domain_initializer_entry(ptr, &e)) |
26a2a1c9 KT |
153 | continue; |
154 | ptr->is_deleted = is_delete; | |
155 | error = 0; | |
ca0b7df3 | 156 | break; |
26a2a1c9 | 157 | } |
9e4b50e9 TH |
158 | if (!is_delete && error) { |
159 | struct tomoyo_domain_initializer_entry *entry = | |
160 | tomoyo_commit_ok(&e, sizeof(e)); | |
161 | if (entry) { | |
162 | list_add_tail_rcu(&entry->list, | |
163 | &tomoyo_domain_initializer_list); | |
164 | error = 0; | |
165 | } | |
26a2a1c9 | 166 | } |
f737d95d | 167 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 168 | out: |
9e4b50e9 TH |
169 | tomoyo_put_name(e.domainname); |
170 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
171 | return error; |
172 | } | |
173 | ||
174 | /** | |
175 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. | |
176 | * | |
177 | * @head: Pointer to "struct tomoyo_io_buffer". | |
178 | * | |
179 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
180 | * |
181 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
182 | */ |
183 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) | |
184 | { | |
185 | struct list_head *pos; | |
186 | bool done = true; | |
187 | ||
26a2a1c9 KT |
188 | list_for_each_cookie(pos, head->read_var2, |
189 | &tomoyo_domain_initializer_list) { | |
190 | const char *no; | |
191 | const char *from = ""; | |
192 | const char *domain = ""; | |
193 | struct tomoyo_domain_initializer_entry *ptr; | |
194 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, | |
195 | list); | |
196 | if (ptr->is_deleted) | |
197 | continue; | |
198 | no = ptr->is_not ? "no_" : ""; | |
199 | if (ptr->domainname) { | |
200 | from = " from "; | |
201 | domain = ptr->domainname->name; | |
202 | } | |
7d2948b1 TH |
203 | done = tomoyo_io_printf(head, |
204 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN | |
205 | "%s%s%s\n", no, ptr->program->name, | |
206 | from, domain); | |
207 | if (!done) | |
26a2a1c9 | 208 | break; |
26a2a1c9 | 209 | } |
26a2a1c9 KT |
210 | return done; |
211 | } | |
212 | ||
213 | /** | |
214 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. | |
215 | * | |
216 | * @data: String to parse. | |
217 | * @is_not: True if it is "no_initialize_domain" entry. | |
218 | * @is_delete: True if it is a delete request. | |
219 | * | |
220 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
221 | * |
222 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
223 | */ |
224 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
225 | const bool is_delete) | |
226 | { | |
227 | char *cp = strstr(data, " from "); | |
228 | ||
229 | if (cp) { | |
230 | *cp = '\0'; | |
231 | return tomoyo_update_domain_initializer_entry(cp + 6, data, | |
232 | is_not, | |
233 | is_delete); | |
234 | } | |
235 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, | |
236 | is_delete); | |
237 | } | |
238 | ||
239 | /** | |
240 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. | |
241 | * | |
242 | * @domainname: The name of domain. | |
243 | * @program: The name of program. | |
244 | * @last_name: The last component of @domainname. | |
245 | * | |
246 | * Returns true if executing @program reinitializes domain transition, | |
247 | * false otherwise. | |
fdb8ebb7 TH |
248 | * |
249 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
250 | */ |
251 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * | |
252 | domainname, | |
253 | const struct tomoyo_path_info *program, | |
254 | const struct tomoyo_path_info * | |
255 | last_name) | |
256 | { | |
257 | struct tomoyo_domain_initializer_entry *ptr; | |
258 | bool flag = false; | |
259 | ||
fdb8ebb7 | 260 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
26a2a1c9 KT |
261 | if (ptr->is_deleted) |
262 | continue; | |
263 | if (ptr->domainname) { | |
264 | if (!ptr->is_last_name) { | |
265 | if (ptr->domainname != domainname) | |
266 | continue; | |
267 | } else { | |
268 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
269 | continue; | |
270 | } | |
271 | } | |
272 | if (tomoyo_pathcmp(ptr->program, program)) | |
273 | continue; | |
274 | if (ptr->is_not) { | |
275 | flag = false; | |
276 | break; | |
277 | } | |
278 | flag = true; | |
279 | } | |
26a2a1c9 KT |
280 | return flag; |
281 | } | |
282 | ||
c3fa109a TH |
283 | /* |
284 | * tomoyo_domain_keeper_list is used for holding list of domainnames which | |
285 | * suppresses domain transition. Normally, a domainname is monotonically | |
286 | * getting longer. But sometimes, we want to suppress domain transition. | |
287 | * It would be convenient for us that programs executed from a login session | |
288 | * belong to the same domain. Thus, TOMOYO provides a way to suppress domain | |
289 | * transition. | |
290 | * | |
291 | * An entry is added by | |
292 | * | |
293 | * # echo 'keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ | |
294 | * /sys/kernel/security/tomoyo/exception_policy | |
295 | * | |
296 | * and is deleted by | |
297 | * | |
298 | * # echo 'delete keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ | |
299 | * /sys/kernel/security/tomoyo/exception_policy | |
300 | * | |
301 | * and all entries are retrieved by | |
302 | * | |
303 | * # grep ^keep_domain /sys/kernel/security/tomoyo/exception_policy | |
304 | * | |
305 | * In the example above, any process which belongs to | |
306 | * "<kernel> /usr/sbin/sshd /bin/bash" domain will remain in that domain, | |
307 | * unless explicitly specified by "initialize_domain" or "no_keep_domain". | |
308 | * | |
309 | * You may specify a program using "from" keyword. | |
310 | * "keep_domain /bin/pwd from <kernel> /usr/sbin/sshd /bin/bash" | |
311 | * will cause "/bin/pwd" executed from "<kernel> /usr/sbin/sshd /bin/bash" | |
312 | * domain to remain in "<kernel> /usr/sbin/sshd /bin/bash" domain. | |
313 | * | |
314 | * You may add "no_" prefix to "keep_domain". | |
315 | * "keep_domain <kernel> /usr/sbin/sshd /bin/bash" and | |
316 | * "no_keep_domain /usr/bin/passwd from <kernel> /usr/sbin/sshd /bin/bash" will | |
317 | * cause "/usr/bin/passwd" to belong to | |
318 | * "<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain, unless | |
319 | * explicitly specified by "initialize_domain". | |
320 | */ | |
847b173e | 321 | LIST_HEAD(tomoyo_domain_keeper_list); |
26a2a1c9 KT |
322 | |
323 | /** | |
324 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. | |
325 | * | |
326 | * @domainname: The name of domain. | |
327 | * @program: The name of program. May be NULL. | |
328 | * @is_not: True if it is "no_keep_domain" entry. | |
329 | * @is_delete: True if it is a delete request. | |
330 | * | |
331 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
332 | * |
333 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
334 | */ |
335 | static int tomoyo_update_domain_keeper_entry(const char *domainname, | |
336 | const char *program, | |
337 | const bool is_not, | |
338 | const bool is_delete) | |
339 | { | |
26a2a1c9 | 340 | struct tomoyo_domain_keeper_entry *ptr; |
9e4b50e9 | 341 | struct tomoyo_domain_keeper_entry e = { .is_not = is_not }; |
ca0b7df3 | 342 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 KT |
343 | |
344 | if (!tomoyo_is_domain_def(domainname) && | |
17080008 | 345 | tomoyo_is_correct_path(domainname, 1, -1, -1)) |
9e4b50e9 | 346 | e.is_last_name = true; |
17080008 | 347 | else if (!tomoyo_is_correct_domain(domainname)) |
26a2a1c9 KT |
348 | return -EINVAL; |
349 | if (program) { | |
17080008 | 350 | if (!tomoyo_is_correct_path(program, 1, -1, -1)) |
26a2a1c9 | 351 | return -EINVAL; |
9e4b50e9 TH |
352 | e.program = tomoyo_get_name(program); |
353 | if (!e.program) | |
ca0b7df3 | 354 | goto out; |
26a2a1c9 | 355 | } |
9e4b50e9 TH |
356 | e.domainname = tomoyo_get_name(domainname); |
357 | if (!e.domainname) | |
ca0b7df3 | 358 | goto out; |
29282381 TH |
359 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
360 | goto out; | |
fdb8ebb7 | 361 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
9e4b50e9 | 362 | if (!tomoyo_is_same_domain_keeper_entry(ptr, &e)) |
26a2a1c9 KT |
363 | continue; |
364 | ptr->is_deleted = is_delete; | |
365 | error = 0; | |
ca0b7df3 | 366 | break; |
26a2a1c9 | 367 | } |
9e4b50e9 TH |
368 | if (!is_delete && error) { |
369 | struct tomoyo_domain_keeper_entry *entry = | |
370 | tomoyo_commit_ok(&e, sizeof(e)); | |
371 | if (entry) { | |
372 | list_add_tail_rcu(&entry->list, | |
373 | &tomoyo_domain_keeper_list); | |
374 | error = 0; | |
375 | } | |
26a2a1c9 | 376 | } |
f737d95d | 377 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 378 | out: |
9e4b50e9 TH |
379 | tomoyo_put_name(e.domainname); |
380 | tomoyo_put_name(e.program); | |
26a2a1c9 KT |
381 | return error; |
382 | } | |
383 | ||
384 | /** | |
385 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. | |
386 | * | |
387 | * @data: String to parse. | |
388 | * @is_not: True if it is "no_keep_domain" entry. | |
389 | * @is_delete: True if it is a delete request. | |
390 | * | |
fdb8ebb7 | 391 | * Caller holds tomoyo_read_lock(). |
26a2a1c9 KT |
392 | */ |
393 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
394 | const bool is_delete) | |
395 | { | |
396 | char *cp = strstr(data, " from "); | |
397 | ||
398 | if (cp) { | |
399 | *cp = '\0'; | |
400 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, | |
401 | is_delete); | |
402 | } | |
403 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); | |
404 | } | |
405 | ||
406 | /** | |
407 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. | |
408 | * | |
409 | * @head: Pointer to "struct tomoyo_io_buffer". | |
410 | * | |
411 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
412 | * |
413 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
414 | */ |
415 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) | |
416 | { | |
417 | struct list_head *pos; | |
33043cbb | 418 | bool done = true; |
26a2a1c9 | 419 | |
26a2a1c9 KT |
420 | list_for_each_cookie(pos, head->read_var2, |
421 | &tomoyo_domain_keeper_list) { | |
422 | struct tomoyo_domain_keeper_entry *ptr; | |
423 | const char *no; | |
424 | const char *from = ""; | |
425 | const char *program = ""; | |
426 | ||
427 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); | |
428 | if (ptr->is_deleted) | |
429 | continue; | |
430 | no = ptr->is_not ? "no_" : ""; | |
431 | if (ptr->program) { | |
432 | from = " from "; | |
433 | program = ptr->program->name; | |
434 | } | |
7d2948b1 TH |
435 | done = tomoyo_io_printf(head, |
436 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN | |
437 | "%s%s%s\n", no, program, from, | |
438 | ptr->domainname->name); | |
439 | if (!done) | |
26a2a1c9 | 440 | break; |
26a2a1c9 | 441 | } |
26a2a1c9 KT |
442 | return done; |
443 | } | |
444 | ||
445 | /** | |
446 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. | |
447 | * | |
448 | * @domainname: The name of domain. | |
449 | * @program: The name of program. | |
450 | * @last_name: The last component of @domainname. | |
451 | * | |
452 | * Returns true if executing @program supresses domain transition, | |
453 | * false otherwise. | |
fdb8ebb7 TH |
454 | * |
455 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
456 | */ |
457 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, | |
458 | const struct tomoyo_path_info *program, | |
459 | const struct tomoyo_path_info *last_name) | |
460 | { | |
461 | struct tomoyo_domain_keeper_entry *ptr; | |
462 | bool flag = false; | |
463 | ||
fdb8ebb7 | 464 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
26a2a1c9 KT |
465 | if (ptr->is_deleted) |
466 | continue; | |
467 | if (!ptr->is_last_name) { | |
468 | if (ptr->domainname != domainname) | |
469 | continue; | |
470 | } else { | |
471 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
472 | continue; | |
473 | } | |
474 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) | |
475 | continue; | |
476 | if (ptr->is_not) { | |
477 | flag = false; | |
478 | break; | |
479 | } | |
480 | flag = true; | |
481 | } | |
26a2a1c9 KT |
482 | return flag; |
483 | } | |
484 | ||
c3fa109a TH |
485 | /* |
486 | * tomoyo_alias_list is used for holding list of symlink's pathnames which are | |
487 | * allowed to be passed to an execve() request. Normally, the domainname which | |
488 | * the current process will belong to after execve() succeeds is calculated | |
489 | * using dereferenced pathnames. But some programs behave differently depending | |
490 | * on the name passed to argv[0]. For busybox, calculating domainname using | |
491 | * dereferenced pathnames will cause all programs in the busybox to belong to | |
492 | * the same domain. Thus, TOMOYO provides a way to allow use of symlink's | |
493 | * pathname for checking execve()'s permission and calculating domainname which | |
494 | * the current process will belong to after execve() succeeds. | |
495 | * | |
496 | * An entry is added by | |
497 | * | |
498 | * # echo 'alias /bin/busybox /bin/cat' > \ | |
499 | * /sys/kernel/security/tomoyo/exception_policy | |
500 | * | |
501 | * and is deleted by | |
502 | * | |
503 | * # echo 'delete alias /bin/busybox /bin/cat' > \ | |
504 | * /sys/kernel/security/tomoyo/exception_policy | |
505 | * | |
506 | * and all entries are retrieved by | |
507 | * | |
508 | * # grep ^alias /sys/kernel/security/tomoyo/exception_policy | |
509 | * | |
510 | * In the example above, if /bin/cat is a symlink to /bin/busybox and execution | |
511 | * of /bin/cat is requested, permission is checked for /bin/cat rather than | |
512 | * /bin/busybox and domainname which the current process will belong to after | |
513 | * execve() succeeds is calculated using /bin/cat rather than /bin/busybox . | |
514 | */ | |
847b173e | 515 | LIST_HEAD(tomoyo_alias_list); |
26a2a1c9 KT |
516 | |
517 | /** | |
518 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. | |
519 | * | |
520 | * @original_name: The original program's real name. | |
521 | * @aliased_name: The symbolic program's symbolic link's name. | |
522 | * @is_delete: True if it is a delete request. | |
523 | * | |
524 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
525 | * |
526 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
527 | */ |
528 | static int tomoyo_update_alias_entry(const char *original_name, | |
529 | const char *aliased_name, | |
530 | const bool is_delete) | |
531 | { | |
26a2a1c9 | 532 | struct tomoyo_alias_entry *ptr; |
9e4b50e9 | 533 | struct tomoyo_alias_entry e = { }; |
ca0b7df3 | 534 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 | 535 | |
17080008 TH |
536 | if (!tomoyo_is_correct_path(original_name, 1, -1, -1) || |
537 | !tomoyo_is_correct_path(aliased_name, 1, -1, -1)) | |
26a2a1c9 | 538 | return -EINVAL; /* No patterns allowed. */ |
9e4b50e9 TH |
539 | e.original_name = tomoyo_get_name(original_name); |
540 | e.aliased_name = tomoyo_get_name(aliased_name); | |
541 | if (!e.original_name || !e.aliased_name) | |
ca0b7df3 | 542 | goto out; |
29282381 TH |
543 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
544 | goto out; | |
fdb8ebb7 | 545 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
9e4b50e9 | 546 | if (!tomoyo_is_same_alias_entry(ptr, &e)) |
26a2a1c9 KT |
547 | continue; |
548 | ptr->is_deleted = is_delete; | |
549 | error = 0; | |
ca0b7df3 | 550 | break; |
26a2a1c9 | 551 | } |
9e4b50e9 TH |
552 | if (!is_delete && error) { |
553 | struct tomoyo_alias_entry *entry = | |
554 | tomoyo_commit_ok(&e, sizeof(e)); | |
555 | if (entry) { | |
556 | list_add_tail_rcu(&entry->list, &tomoyo_alias_list); | |
557 | error = 0; | |
558 | } | |
26a2a1c9 | 559 | } |
f737d95d | 560 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 561 | out: |
9e4b50e9 TH |
562 | tomoyo_put_name(e.original_name); |
563 | tomoyo_put_name(e.aliased_name); | |
26a2a1c9 KT |
564 | return error; |
565 | } | |
566 | ||
567 | /** | |
568 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. | |
569 | * | |
570 | * @head: Pointer to "struct tomoyo_io_buffer". | |
571 | * | |
572 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
573 | * |
574 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
575 | */ |
576 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) | |
577 | { | |
578 | struct list_head *pos; | |
579 | bool done = true; | |
580 | ||
26a2a1c9 KT |
581 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { |
582 | struct tomoyo_alias_entry *ptr; | |
583 | ||
584 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); | |
585 | if (ptr->is_deleted) | |
586 | continue; | |
7d2948b1 TH |
587 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
588 | ptr->original_name->name, | |
589 | ptr->aliased_name->name); | |
590 | if (!done) | |
26a2a1c9 | 591 | break; |
26a2a1c9 | 592 | } |
26a2a1c9 KT |
593 | return done; |
594 | } | |
595 | ||
596 | /** | |
597 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. | |
598 | * | |
599 | * @data: String to parse. | |
600 | * @is_delete: True if it is a delete request. | |
601 | * | |
602 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
603 | * |
604 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
605 | */ |
606 | int tomoyo_write_alias_policy(char *data, const bool is_delete) | |
607 | { | |
608 | char *cp = strchr(data, ' '); | |
609 | ||
610 | if (!cp) | |
611 | return -EINVAL; | |
612 | *cp++ = '\0'; | |
613 | return tomoyo_update_alias_entry(data, cp, is_delete); | |
614 | } | |
615 | ||
26a2a1c9 KT |
616 | /** |
617 | * tomoyo_find_or_assign_new_domain - Create a domain. | |
618 | * | |
619 | * @domainname: The name of domain. | |
620 | * @profile: Profile number to assign if the domain was newly created. | |
621 | * | |
622 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
fdb8ebb7 TH |
623 | * |
624 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
625 | */ |
626 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
627 | domainname, | |
628 | const u8 profile) | |
629 | { | |
ca0b7df3 | 630 | struct tomoyo_domain_info *entry; |
29282381 | 631 | struct tomoyo_domain_info *domain = NULL; |
26a2a1c9 | 632 | const struct tomoyo_path_info *saved_domainname; |
ca0b7df3 | 633 | bool found = false; |
26a2a1c9 | 634 | |
17080008 | 635 | if (!tomoyo_is_correct_domain(domainname)) |
ca0b7df3 | 636 | return NULL; |
bf24fb01 | 637 | saved_domainname = tomoyo_get_name(domainname); |
26a2a1c9 | 638 | if (!saved_domainname) |
ca0b7df3 | 639 | return NULL; |
4e5d6f7e | 640 | entry = kzalloc(sizeof(*entry), GFP_NOFS); |
29282381 TH |
641 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
642 | goto out; | |
ca0b7df3 TH |
643 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
644 | if (domain->is_deleted || | |
645 | tomoyo_pathcmp(saved_domainname, domain->domainname)) | |
646 | continue; | |
647 | found = true; | |
648 | break; | |
649 | } | |
650 | if (!found && tomoyo_memory_ok(entry)) { | |
651 | INIT_LIST_HEAD(&entry->acl_info_list); | |
652 | entry->domainname = saved_domainname; | |
bf24fb01 | 653 | saved_domainname = NULL; |
ca0b7df3 TH |
654 | entry->profile = profile; |
655 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
656 | domain = entry; | |
657 | entry = NULL; | |
658 | found = true; | |
26a2a1c9 | 659 | } |
f737d95d | 660 | mutex_unlock(&tomoyo_policy_lock); |
29282381 | 661 | out: |
bf24fb01 | 662 | tomoyo_put_name(saved_domainname); |
ca0b7df3 TH |
663 | kfree(entry); |
664 | return found ? domain : NULL; | |
26a2a1c9 KT |
665 | } |
666 | ||
667 | /** | |
668 | * tomoyo_find_next_domain - Find a domain. | |
669 | * | |
56f8c9bc | 670 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
671 | * |
672 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
673 | * |
674 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 675 | */ |
56f8c9bc | 676 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 | 677 | { |
17fcfbd9 | 678 | struct tomoyo_request_info r; |
c8c57e84 | 679 | char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); |
26a2a1c9 KT |
680 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
681 | struct tomoyo_domain_info *domain = NULL; | |
682 | const char *old_domain_name = old_domain->domainname->name; | |
683 | const char *original_name = bprm->filename; | |
26a2a1c9 | 684 | const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); |
cb0abe6a | 685 | const bool is_enforce = (mode == TOMOYO_CONFIG_ENFORCING); |
26a2a1c9 | 686 | int retval = -ENOMEM; |
c8c57e84 TH |
687 | bool need_kfree = false; |
688 | struct tomoyo_path_info rn = { }; /* real name */ | |
689 | struct tomoyo_path_info sn = { }; /* symlink name */ | |
17fcfbd9 | 690 | struct tomoyo_path_info ln; /* last name */ |
26a2a1c9 | 691 | |
c8c57e84 TH |
692 | ln.name = tomoyo_get_last_name(old_domain); |
693 | tomoyo_fill_path_info(&ln); | |
17fcfbd9 | 694 | tomoyo_init_request_info(&r, NULL); |
26a2a1c9 KT |
695 | if (!tmp) |
696 | goto out; | |
697 | ||
17fcfbd9 | 698 | retry: |
c8c57e84 TH |
699 | if (need_kfree) { |
700 | kfree(rn.name); | |
701 | need_kfree = false; | |
702 | } | |
26a2a1c9 KT |
703 | /* Get tomoyo_realpath of program. */ |
704 | retval = -ENOENT; | |
c8c57e84 TH |
705 | rn.name = tomoyo_realpath(original_name); |
706 | if (!rn.name) | |
26a2a1c9 | 707 | goto out; |
c8c57e84 TH |
708 | tomoyo_fill_path_info(&rn); |
709 | need_kfree = true; | |
710 | ||
26a2a1c9 | 711 | /* Get tomoyo_realpath of symbolic link. */ |
c8c57e84 TH |
712 | sn.name = tomoyo_realpath_nofollow(original_name); |
713 | if (!sn.name) | |
26a2a1c9 | 714 | goto out; |
17fcfbd9 | 715 | tomoyo_fill_path_info(&sn); |
26a2a1c9 KT |
716 | |
717 | /* Check 'alias' directive. */ | |
17fcfbd9 | 718 | if (tomoyo_pathcmp(&rn, &sn)) { |
26a2a1c9 KT |
719 | struct tomoyo_alias_entry *ptr; |
720 | /* Is this program allowed to be called via symbolic links? */ | |
fdb8ebb7 | 721 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
26a2a1c9 | 722 | if (ptr->is_deleted || |
17fcfbd9 TH |
723 | tomoyo_pathcmp(&rn, ptr->original_name) || |
724 | tomoyo_pathcmp(&sn, ptr->aliased_name)) | |
26a2a1c9 | 725 | continue; |
c8c57e84 TH |
726 | kfree(rn.name); |
727 | need_kfree = false; | |
728 | /* This is OK because it is read only. */ | |
729 | rn = *ptr->aliased_name; | |
26a2a1c9 KT |
730 | break; |
731 | } | |
26a2a1c9 KT |
732 | } |
733 | ||
734 | /* Check execute permission. */ | |
17fcfbd9 TH |
735 | retval = tomoyo_check_exec_perm(old_domain, &rn); |
736 | if (retval == TOMOYO_RETRY_REQUEST) | |
737 | goto retry; | |
26a2a1c9 KT |
738 | if (retval < 0) |
739 | goto out; | |
740 | ||
17fcfbd9 | 741 | if (tomoyo_is_domain_initializer(old_domain->domainname, &rn, &ln)) { |
26a2a1c9 | 742 | /* Transit to the child of tomoyo_kernel_domain domain. */ |
c8c57e84 TH |
743 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, |
744 | TOMOYO_ROOT_NAME " " "%s", rn.name); | |
26a2a1c9 KT |
745 | } else if (old_domain == &tomoyo_kernel_domain && |
746 | !tomoyo_policy_loaded) { | |
747 | /* | |
748 | * Needn't to transit from kernel domain before starting | |
749 | * /sbin/init. But transit from kernel domain if executing | |
750 | * initializers because they might start before /sbin/init. | |
751 | */ | |
752 | domain = old_domain; | |
17fcfbd9 | 753 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &rn, &ln)) { |
26a2a1c9 KT |
754 | /* Keep current domain. */ |
755 | domain = old_domain; | |
756 | } else { | |
757 | /* Normal domain transition. */ | |
c8c57e84 TH |
758 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, |
759 | "%s %s", old_domain_name, rn.name); | |
26a2a1c9 | 760 | } |
c8c57e84 | 761 | if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10) |
26a2a1c9 | 762 | goto done; |
c8c57e84 | 763 | domain = tomoyo_find_domain(tmp); |
26a2a1c9 KT |
764 | if (domain) |
765 | goto done; | |
17fcfbd9 TH |
766 | if (is_enforce) { |
767 | int error = tomoyo_supervisor(&r, "# wants to create domain\n" | |
c8c57e84 | 768 | "%s\n", tmp); |
17fcfbd9 TH |
769 | if (error == TOMOYO_RETRY_REQUEST) |
770 | goto retry; | |
771 | if (error < 0) | |
772 | goto done; | |
773 | } | |
c8c57e84 | 774 | domain = tomoyo_find_or_assign_new_domain(tmp, old_domain->profile); |
26a2a1c9 KT |
775 | done: |
776 | if (domain) | |
777 | goto out; | |
c8c57e84 | 778 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp); |
26a2a1c9 KT |
779 | if (is_enforce) |
780 | retval = -EPERM; | |
781 | else | |
ea13ddba | 782 | old_domain->transition_failed = true; |
26a2a1c9 | 783 | out: |
56f8c9bc TH |
784 | if (!domain) |
785 | domain = old_domain; | |
ec8e6a4e TH |
786 | /* Update reference count on "struct tomoyo_domain_info". */ |
787 | atomic_inc(&domain->users); | |
56f8c9bc | 788 | bprm->cred->security = domain; |
c8c57e84 TH |
789 | if (need_kfree) |
790 | kfree(rn.name); | |
791 | kfree(sn.name); | |
8e2d39a1 | 792 | kfree(tmp); |
26a2a1c9 KT |
793 | return retval; |
794 | } |