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Commit | Line | Data |
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26a2a1c9 KT |
1 | /* |
2 | * security/tomoyo/domain.c | |
3 | * | |
4 | * Implementation of the Domain-Based Mandatory Access Control. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
26a2a1c9 KT |
9 | * |
10 | */ | |
11 | ||
12 | #include "common.h" | |
26a2a1c9 | 13 | #include <linux/binfmts.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
26a2a1c9 KT |
15 | |
16 | /* Variables definitions.*/ | |
17 | ||
18 | /* The initial domain. */ | |
19 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
20 | ||
c3fa109a TH |
21 | /* |
22 | * tomoyo_domain_list is used for holding list of domains. | |
23 | * The ->acl_info_list of "struct tomoyo_domain_info" is used for holding | |
24 | * permissions (e.g. "allow_read /lib/libc-2.5.so") given to each domain. | |
25 | * | |
26 | * An entry is added by | |
27 | * | |
28 | * # ( echo "<kernel>"; echo "allow_execute /sbin/init" ) > \ | |
29 | * /sys/kernel/security/tomoyo/domain_policy | |
30 | * | |
31 | * and is deleted by | |
32 | * | |
33 | * # ( echo "<kernel>"; echo "delete allow_execute /sbin/init" ) > \ | |
34 | * /sys/kernel/security/tomoyo/domain_policy | |
35 | * | |
36 | * and all entries are retrieved by | |
37 | * | |
38 | * # cat /sys/kernel/security/tomoyo/domain_policy | |
39 | * | |
40 | * A domain is added by | |
41 | * | |
42 | * # echo "<kernel>" > /sys/kernel/security/tomoyo/domain_policy | |
43 | * | |
44 | * and is deleted by | |
45 | * | |
46 | * # echo "delete <kernel>" > /sys/kernel/security/tomoyo/domain_policy | |
47 | * | |
48 | * and all domains are retrieved by | |
49 | * | |
50 | * # grep '^<kernel>' /sys/kernel/security/tomoyo/domain_policy | |
51 | * | |
52 | * Normally, a domainname is monotonically getting longer because a domainname | |
53 | * which the process will belong to if an execve() operation succeeds is | |
54 | * defined as a concatenation of "current domainname" + "pathname passed to | |
55 | * execve()". | |
56 | * See tomoyo_domain_initializer_list and tomoyo_domain_keeper_list for | |
57 | * exceptions. | |
58 | */ | |
26a2a1c9 | 59 | LIST_HEAD(tomoyo_domain_list); |
26a2a1c9 | 60 | |
26a2a1c9 KT |
61 | /** |
62 | * tomoyo_get_last_name - Get last component of a domainname. | |
63 | * | |
64 | * @domain: Pointer to "struct tomoyo_domain_info". | |
65 | * | |
66 | * Returns the last component of the domainname. | |
67 | */ | |
68 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) | |
69 | { | |
70 | const char *cp0 = domain->domainname->name; | |
71 | const char *cp1 = strrchr(cp0, ' '); | |
72 | ||
73 | if (cp1) | |
74 | return cp1 + 1; | |
75 | return cp0; | |
76 | } | |
77 | ||
c3fa109a TH |
78 | /* |
79 | * tomoyo_domain_initializer_list is used for holding list of programs which | |
80 | * triggers reinitialization of domainname. Normally, a domainname is | |
81 | * monotonically getting longer. But sometimes, we restart daemon programs. | |
82 | * It would be convenient for us that "a daemon started upon system boot" and | |
83 | * "the daemon restarted from console" belong to the same domain. Thus, TOMOYO | |
84 | * provides a way to shorten domainnames. | |
85 | * | |
86 | * An entry is added by | |
87 | * | |
88 | * # echo 'initialize_domain /usr/sbin/httpd' > \ | |
89 | * /sys/kernel/security/tomoyo/exception_policy | |
90 | * | |
91 | * and is deleted by | |
92 | * | |
93 | * # echo 'delete initialize_domain /usr/sbin/httpd' > \ | |
94 | * /sys/kernel/security/tomoyo/exception_policy | |
95 | * | |
96 | * and all entries are retrieved by | |
97 | * | |
98 | * # grep ^initialize_domain /sys/kernel/security/tomoyo/exception_policy | |
99 | * | |
100 | * In the example above, /usr/sbin/httpd will belong to | |
101 | * "<kernel> /usr/sbin/httpd" domain. | |
102 | * | |
103 | * You may specify a domainname using "from" keyword. | |
104 | * "initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" | |
105 | * will cause "/usr/sbin/httpd" executed from "<kernel> /etc/rc.d/init.d/httpd" | |
106 | * domain to belong to "<kernel> /usr/sbin/httpd" domain. | |
107 | * | |
108 | * You may add "no_" prefix to "initialize_domain". | |
109 | * "initialize_domain /usr/sbin/httpd" and | |
110 | * "no_initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" | |
111 | * will cause "/usr/sbin/httpd" to belong to "<kernel> /usr/sbin/httpd" domain | |
112 | * unless executed from "<kernel> /etc/rc.d/init.d/httpd" domain. | |
113 | */ | |
847b173e | 114 | LIST_HEAD(tomoyo_domain_initializer_list); |
26a2a1c9 KT |
115 | |
116 | /** | |
117 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. | |
118 | * | |
119 | * @domainname: The name of domain. May be NULL. | |
120 | * @program: The name of program. | |
121 | * @is_not: True if it is "no_initialize_domain" entry. | |
122 | * @is_delete: True if it is a delete request. | |
123 | * | |
124 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
125 | * |
126 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
127 | */ |
128 | static int tomoyo_update_domain_initializer_entry(const char *domainname, | |
129 | const char *program, | |
130 | const bool is_not, | |
131 | const bool is_delete) | |
132 | { | |
ca0b7df3 | 133 | struct tomoyo_domain_initializer_entry *entry = NULL; |
26a2a1c9 | 134 | struct tomoyo_domain_initializer_entry *ptr; |
bf24fb01 | 135 | const struct tomoyo_path_info *saved_program = NULL; |
26a2a1c9 | 136 | const struct tomoyo_path_info *saved_domainname = NULL; |
ca0b7df3 | 137 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 KT |
138 | bool is_last_name = false; |
139 | ||
17080008 | 140 | if (!tomoyo_is_correct_path(program, 1, -1, -1)) |
26a2a1c9 KT |
141 | return -EINVAL; /* No patterns allowed. */ |
142 | if (domainname) { | |
143 | if (!tomoyo_is_domain_def(domainname) && | |
17080008 | 144 | tomoyo_is_correct_path(domainname, 1, -1, -1)) |
26a2a1c9 | 145 | is_last_name = true; |
17080008 | 146 | else if (!tomoyo_is_correct_domain(domainname)) |
26a2a1c9 | 147 | return -EINVAL; |
bf24fb01 | 148 | saved_domainname = tomoyo_get_name(domainname); |
26a2a1c9 | 149 | if (!saved_domainname) |
ca0b7df3 | 150 | goto out; |
26a2a1c9 | 151 | } |
bf24fb01 | 152 | saved_program = tomoyo_get_name(program); |
26a2a1c9 | 153 | if (!saved_program) |
ca0b7df3 TH |
154 | goto out; |
155 | if (!is_delete) | |
156 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 157 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 158 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
26a2a1c9 KT |
159 | if (ptr->is_not != is_not || |
160 | ptr->domainname != saved_domainname || | |
161 | ptr->program != saved_program) | |
162 | continue; | |
163 | ptr->is_deleted = is_delete; | |
164 | error = 0; | |
ca0b7df3 | 165 | break; |
26a2a1c9 | 166 | } |
ca0b7df3 TH |
167 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
168 | entry->domainname = saved_domainname; | |
bf24fb01 | 169 | saved_domainname = NULL; |
ca0b7df3 | 170 | entry->program = saved_program; |
bf24fb01 | 171 | saved_program = NULL; |
ca0b7df3 TH |
172 | entry->is_not = is_not; |
173 | entry->is_last_name = is_last_name; | |
174 | list_add_tail_rcu(&entry->list, | |
175 | &tomoyo_domain_initializer_list); | |
176 | entry = NULL; | |
177 | error = 0; | |
26a2a1c9 | 178 | } |
f737d95d | 179 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 180 | out: |
bf24fb01 TH |
181 | tomoyo_put_name(saved_domainname); |
182 | tomoyo_put_name(saved_program); | |
ca0b7df3 | 183 | kfree(entry); |
26a2a1c9 KT |
184 | return error; |
185 | } | |
186 | ||
187 | /** | |
188 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. | |
189 | * | |
190 | * @head: Pointer to "struct tomoyo_io_buffer". | |
191 | * | |
192 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
193 | * |
194 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
195 | */ |
196 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) | |
197 | { | |
198 | struct list_head *pos; | |
199 | bool done = true; | |
200 | ||
26a2a1c9 KT |
201 | list_for_each_cookie(pos, head->read_var2, |
202 | &tomoyo_domain_initializer_list) { | |
203 | const char *no; | |
204 | const char *from = ""; | |
205 | const char *domain = ""; | |
206 | struct tomoyo_domain_initializer_entry *ptr; | |
207 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, | |
208 | list); | |
209 | if (ptr->is_deleted) | |
210 | continue; | |
211 | no = ptr->is_not ? "no_" : ""; | |
212 | if (ptr->domainname) { | |
213 | from = " from "; | |
214 | domain = ptr->domainname->name; | |
215 | } | |
7d2948b1 TH |
216 | done = tomoyo_io_printf(head, |
217 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN | |
218 | "%s%s%s\n", no, ptr->program->name, | |
219 | from, domain); | |
220 | if (!done) | |
26a2a1c9 | 221 | break; |
26a2a1c9 | 222 | } |
26a2a1c9 KT |
223 | return done; |
224 | } | |
225 | ||
226 | /** | |
227 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. | |
228 | * | |
229 | * @data: String to parse. | |
230 | * @is_not: True if it is "no_initialize_domain" entry. | |
231 | * @is_delete: True if it is a delete request. | |
232 | * | |
233 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
234 | * |
235 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
236 | */ |
237 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
238 | const bool is_delete) | |
239 | { | |
240 | char *cp = strstr(data, " from "); | |
241 | ||
242 | if (cp) { | |
243 | *cp = '\0'; | |
244 | return tomoyo_update_domain_initializer_entry(cp + 6, data, | |
245 | is_not, | |
246 | is_delete); | |
247 | } | |
248 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, | |
249 | is_delete); | |
250 | } | |
251 | ||
252 | /** | |
253 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. | |
254 | * | |
255 | * @domainname: The name of domain. | |
256 | * @program: The name of program. | |
257 | * @last_name: The last component of @domainname. | |
258 | * | |
259 | * Returns true if executing @program reinitializes domain transition, | |
260 | * false otherwise. | |
fdb8ebb7 TH |
261 | * |
262 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
263 | */ |
264 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * | |
265 | domainname, | |
266 | const struct tomoyo_path_info *program, | |
267 | const struct tomoyo_path_info * | |
268 | last_name) | |
269 | { | |
270 | struct tomoyo_domain_initializer_entry *ptr; | |
271 | bool flag = false; | |
272 | ||
fdb8ebb7 | 273 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
26a2a1c9 KT |
274 | if (ptr->is_deleted) |
275 | continue; | |
276 | if (ptr->domainname) { | |
277 | if (!ptr->is_last_name) { | |
278 | if (ptr->domainname != domainname) | |
279 | continue; | |
280 | } else { | |
281 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
282 | continue; | |
283 | } | |
284 | } | |
285 | if (tomoyo_pathcmp(ptr->program, program)) | |
286 | continue; | |
287 | if (ptr->is_not) { | |
288 | flag = false; | |
289 | break; | |
290 | } | |
291 | flag = true; | |
292 | } | |
26a2a1c9 KT |
293 | return flag; |
294 | } | |
295 | ||
c3fa109a TH |
296 | /* |
297 | * tomoyo_domain_keeper_list is used for holding list of domainnames which | |
298 | * suppresses domain transition. Normally, a domainname is monotonically | |
299 | * getting longer. But sometimes, we want to suppress domain transition. | |
300 | * It would be convenient for us that programs executed from a login session | |
301 | * belong to the same domain. Thus, TOMOYO provides a way to suppress domain | |
302 | * transition. | |
303 | * | |
304 | * An entry is added by | |
305 | * | |
306 | * # echo 'keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ | |
307 | * /sys/kernel/security/tomoyo/exception_policy | |
308 | * | |
309 | * and is deleted by | |
310 | * | |
311 | * # echo 'delete keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ | |
312 | * /sys/kernel/security/tomoyo/exception_policy | |
313 | * | |
314 | * and all entries are retrieved by | |
315 | * | |
316 | * # grep ^keep_domain /sys/kernel/security/tomoyo/exception_policy | |
317 | * | |
318 | * In the example above, any process which belongs to | |
319 | * "<kernel> /usr/sbin/sshd /bin/bash" domain will remain in that domain, | |
320 | * unless explicitly specified by "initialize_domain" or "no_keep_domain". | |
321 | * | |
322 | * You may specify a program using "from" keyword. | |
323 | * "keep_domain /bin/pwd from <kernel> /usr/sbin/sshd /bin/bash" | |
324 | * will cause "/bin/pwd" executed from "<kernel> /usr/sbin/sshd /bin/bash" | |
325 | * domain to remain in "<kernel> /usr/sbin/sshd /bin/bash" domain. | |
326 | * | |
327 | * You may add "no_" prefix to "keep_domain". | |
328 | * "keep_domain <kernel> /usr/sbin/sshd /bin/bash" and | |
329 | * "no_keep_domain /usr/bin/passwd from <kernel> /usr/sbin/sshd /bin/bash" will | |
330 | * cause "/usr/bin/passwd" to belong to | |
331 | * "<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain, unless | |
332 | * explicitly specified by "initialize_domain". | |
333 | */ | |
847b173e | 334 | LIST_HEAD(tomoyo_domain_keeper_list); |
26a2a1c9 KT |
335 | |
336 | /** | |
337 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. | |
338 | * | |
339 | * @domainname: The name of domain. | |
340 | * @program: The name of program. May be NULL. | |
341 | * @is_not: True if it is "no_keep_domain" entry. | |
342 | * @is_delete: True if it is a delete request. | |
343 | * | |
344 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
345 | * |
346 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
347 | */ |
348 | static int tomoyo_update_domain_keeper_entry(const char *domainname, | |
349 | const char *program, | |
350 | const bool is_not, | |
351 | const bool is_delete) | |
352 | { | |
ca0b7df3 | 353 | struct tomoyo_domain_keeper_entry *entry = NULL; |
26a2a1c9 | 354 | struct tomoyo_domain_keeper_entry *ptr; |
bf24fb01 | 355 | const struct tomoyo_path_info *saved_domainname = NULL; |
26a2a1c9 | 356 | const struct tomoyo_path_info *saved_program = NULL; |
ca0b7df3 | 357 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 KT |
358 | bool is_last_name = false; |
359 | ||
360 | if (!tomoyo_is_domain_def(domainname) && | |
17080008 | 361 | tomoyo_is_correct_path(domainname, 1, -1, -1)) |
26a2a1c9 | 362 | is_last_name = true; |
17080008 | 363 | else if (!tomoyo_is_correct_domain(domainname)) |
26a2a1c9 KT |
364 | return -EINVAL; |
365 | if (program) { | |
17080008 | 366 | if (!tomoyo_is_correct_path(program, 1, -1, -1)) |
26a2a1c9 | 367 | return -EINVAL; |
bf24fb01 | 368 | saved_program = tomoyo_get_name(program); |
26a2a1c9 | 369 | if (!saved_program) |
ca0b7df3 | 370 | goto out; |
26a2a1c9 | 371 | } |
bf24fb01 | 372 | saved_domainname = tomoyo_get_name(domainname); |
26a2a1c9 | 373 | if (!saved_domainname) |
ca0b7df3 TH |
374 | goto out; |
375 | if (!is_delete) | |
376 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 377 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 378 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
26a2a1c9 KT |
379 | if (ptr->is_not != is_not || |
380 | ptr->domainname != saved_domainname || | |
381 | ptr->program != saved_program) | |
382 | continue; | |
383 | ptr->is_deleted = is_delete; | |
384 | error = 0; | |
ca0b7df3 | 385 | break; |
26a2a1c9 | 386 | } |
ca0b7df3 TH |
387 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
388 | entry->domainname = saved_domainname; | |
bf24fb01 | 389 | saved_domainname = NULL; |
ca0b7df3 | 390 | entry->program = saved_program; |
bf24fb01 | 391 | saved_program = NULL; |
ca0b7df3 TH |
392 | entry->is_not = is_not; |
393 | entry->is_last_name = is_last_name; | |
394 | list_add_tail_rcu(&entry->list, &tomoyo_domain_keeper_list); | |
395 | entry = NULL; | |
396 | error = 0; | |
26a2a1c9 | 397 | } |
f737d95d | 398 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 399 | out: |
bf24fb01 TH |
400 | tomoyo_put_name(saved_domainname); |
401 | tomoyo_put_name(saved_program); | |
ca0b7df3 | 402 | kfree(entry); |
26a2a1c9 KT |
403 | return error; |
404 | } | |
405 | ||
406 | /** | |
407 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. | |
408 | * | |
409 | * @data: String to parse. | |
410 | * @is_not: True if it is "no_keep_domain" entry. | |
411 | * @is_delete: True if it is a delete request. | |
412 | * | |
fdb8ebb7 | 413 | * Caller holds tomoyo_read_lock(). |
26a2a1c9 KT |
414 | */ |
415 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
416 | const bool is_delete) | |
417 | { | |
418 | char *cp = strstr(data, " from "); | |
419 | ||
420 | if (cp) { | |
421 | *cp = '\0'; | |
422 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, | |
423 | is_delete); | |
424 | } | |
425 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); | |
426 | } | |
427 | ||
428 | /** | |
429 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. | |
430 | * | |
431 | * @head: Pointer to "struct tomoyo_io_buffer". | |
432 | * | |
433 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
434 | * |
435 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
436 | */ |
437 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) | |
438 | { | |
439 | struct list_head *pos; | |
33043cbb | 440 | bool done = true; |
26a2a1c9 | 441 | |
26a2a1c9 KT |
442 | list_for_each_cookie(pos, head->read_var2, |
443 | &tomoyo_domain_keeper_list) { | |
444 | struct tomoyo_domain_keeper_entry *ptr; | |
445 | const char *no; | |
446 | const char *from = ""; | |
447 | const char *program = ""; | |
448 | ||
449 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); | |
450 | if (ptr->is_deleted) | |
451 | continue; | |
452 | no = ptr->is_not ? "no_" : ""; | |
453 | if (ptr->program) { | |
454 | from = " from "; | |
455 | program = ptr->program->name; | |
456 | } | |
7d2948b1 TH |
457 | done = tomoyo_io_printf(head, |
458 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN | |
459 | "%s%s%s\n", no, program, from, | |
460 | ptr->domainname->name); | |
461 | if (!done) | |
26a2a1c9 | 462 | break; |
26a2a1c9 | 463 | } |
26a2a1c9 KT |
464 | return done; |
465 | } | |
466 | ||
467 | /** | |
468 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. | |
469 | * | |
470 | * @domainname: The name of domain. | |
471 | * @program: The name of program. | |
472 | * @last_name: The last component of @domainname. | |
473 | * | |
474 | * Returns true if executing @program supresses domain transition, | |
475 | * false otherwise. | |
fdb8ebb7 TH |
476 | * |
477 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
478 | */ |
479 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, | |
480 | const struct tomoyo_path_info *program, | |
481 | const struct tomoyo_path_info *last_name) | |
482 | { | |
483 | struct tomoyo_domain_keeper_entry *ptr; | |
484 | bool flag = false; | |
485 | ||
fdb8ebb7 | 486 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
26a2a1c9 KT |
487 | if (ptr->is_deleted) |
488 | continue; | |
489 | if (!ptr->is_last_name) { | |
490 | if (ptr->domainname != domainname) | |
491 | continue; | |
492 | } else { | |
493 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
494 | continue; | |
495 | } | |
496 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) | |
497 | continue; | |
498 | if (ptr->is_not) { | |
499 | flag = false; | |
500 | break; | |
501 | } | |
502 | flag = true; | |
503 | } | |
26a2a1c9 KT |
504 | return flag; |
505 | } | |
506 | ||
c3fa109a TH |
507 | /* |
508 | * tomoyo_alias_list is used for holding list of symlink's pathnames which are | |
509 | * allowed to be passed to an execve() request. Normally, the domainname which | |
510 | * the current process will belong to after execve() succeeds is calculated | |
511 | * using dereferenced pathnames. But some programs behave differently depending | |
512 | * on the name passed to argv[0]. For busybox, calculating domainname using | |
513 | * dereferenced pathnames will cause all programs in the busybox to belong to | |
514 | * the same domain. Thus, TOMOYO provides a way to allow use of symlink's | |
515 | * pathname for checking execve()'s permission and calculating domainname which | |
516 | * the current process will belong to after execve() succeeds. | |
517 | * | |
518 | * An entry is added by | |
519 | * | |
520 | * # echo 'alias /bin/busybox /bin/cat' > \ | |
521 | * /sys/kernel/security/tomoyo/exception_policy | |
522 | * | |
523 | * and is deleted by | |
524 | * | |
525 | * # echo 'delete alias /bin/busybox /bin/cat' > \ | |
526 | * /sys/kernel/security/tomoyo/exception_policy | |
527 | * | |
528 | * and all entries are retrieved by | |
529 | * | |
530 | * # grep ^alias /sys/kernel/security/tomoyo/exception_policy | |
531 | * | |
532 | * In the example above, if /bin/cat is a symlink to /bin/busybox and execution | |
533 | * of /bin/cat is requested, permission is checked for /bin/cat rather than | |
534 | * /bin/busybox and domainname which the current process will belong to after | |
535 | * execve() succeeds is calculated using /bin/cat rather than /bin/busybox . | |
536 | */ | |
847b173e | 537 | LIST_HEAD(tomoyo_alias_list); |
26a2a1c9 KT |
538 | |
539 | /** | |
540 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. | |
541 | * | |
542 | * @original_name: The original program's real name. | |
543 | * @aliased_name: The symbolic program's symbolic link's name. | |
544 | * @is_delete: True if it is a delete request. | |
545 | * | |
546 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
547 | * |
548 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
549 | */ |
550 | static int tomoyo_update_alias_entry(const char *original_name, | |
551 | const char *aliased_name, | |
552 | const bool is_delete) | |
553 | { | |
ca0b7df3 | 554 | struct tomoyo_alias_entry *entry = NULL; |
26a2a1c9 KT |
555 | struct tomoyo_alias_entry *ptr; |
556 | const struct tomoyo_path_info *saved_original_name; | |
557 | const struct tomoyo_path_info *saved_aliased_name; | |
ca0b7df3 | 558 | int error = is_delete ? -ENOENT : -ENOMEM; |
26a2a1c9 | 559 | |
17080008 TH |
560 | if (!tomoyo_is_correct_path(original_name, 1, -1, -1) || |
561 | !tomoyo_is_correct_path(aliased_name, 1, -1, -1)) | |
26a2a1c9 | 562 | return -EINVAL; /* No patterns allowed. */ |
bf24fb01 TH |
563 | saved_original_name = tomoyo_get_name(original_name); |
564 | saved_aliased_name = tomoyo_get_name(aliased_name); | |
26a2a1c9 | 565 | if (!saved_original_name || !saved_aliased_name) |
ca0b7df3 TH |
566 | goto out; |
567 | if (!is_delete) | |
568 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | |
f737d95d | 569 | mutex_lock(&tomoyo_policy_lock); |
fdb8ebb7 | 570 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
26a2a1c9 KT |
571 | if (ptr->original_name != saved_original_name || |
572 | ptr->aliased_name != saved_aliased_name) | |
573 | continue; | |
574 | ptr->is_deleted = is_delete; | |
575 | error = 0; | |
ca0b7df3 | 576 | break; |
26a2a1c9 | 577 | } |
ca0b7df3 TH |
578 | if (!is_delete && error && tomoyo_memory_ok(entry)) { |
579 | entry->original_name = saved_original_name; | |
bf24fb01 | 580 | saved_original_name = NULL; |
ca0b7df3 | 581 | entry->aliased_name = saved_aliased_name; |
bf24fb01 | 582 | saved_aliased_name = NULL; |
ca0b7df3 TH |
583 | list_add_tail_rcu(&entry->list, &tomoyo_alias_list); |
584 | entry = NULL; | |
585 | error = 0; | |
26a2a1c9 | 586 | } |
f737d95d | 587 | mutex_unlock(&tomoyo_policy_lock); |
ca0b7df3 | 588 | out: |
bf24fb01 TH |
589 | tomoyo_put_name(saved_original_name); |
590 | tomoyo_put_name(saved_aliased_name); | |
ca0b7df3 | 591 | kfree(entry); |
26a2a1c9 KT |
592 | return error; |
593 | } | |
594 | ||
595 | /** | |
596 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. | |
597 | * | |
598 | * @head: Pointer to "struct tomoyo_io_buffer". | |
599 | * | |
600 | * Returns true on success, false otherwise. | |
fdb8ebb7 TH |
601 | * |
602 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
603 | */ |
604 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) | |
605 | { | |
606 | struct list_head *pos; | |
607 | bool done = true; | |
608 | ||
26a2a1c9 KT |
609 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { |
610 | struct tomoyo_alias_entry *ptr; | |
611 | ||
612 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); | |
613 | if (ptr->is_deleted) | |
614 | continue; | |
7d2948b1 TH |
615 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
616 | ptr->original_name->name, | |
617 | ptr->aliased_name->name); | |
618 | if (!done) | |
26a2a1c9 | 619 | break; |
26a2a1c9 | 620 | } |
26a2a1c9 KT |
621 | return done; |
622 | } | |
623 | ||
624 | /** | |
625 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. | |
626 | * | |
627 | * @data: String to parse. | |
628 | * @is_delete: True if it is a delete request. | |
629 | * | |
630 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
631 | * |
632 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
633 | */ |
634 | int tomoyo_write_alias_policy(char *data, const bool is_delete) | |
635 | { | |
636 | char *cp = strchr(data, ' '); | |
637 | ||
638 | if (!cp) | |
639 | return -EINVAL; | |
640 | *cp++ = '\0'; | |
641 | return tomoyo_update_alias_entry(data, cp, is_delete); | |
642 | } | |
643 | ||
26a2a1c9 KT |
644 | /** |
645 | * tomoyo_find_or_assign_new_domain - Create a domain. | |
646 | * | |
647 | * @domainname: The name of domain. | |
648 | * @profile: Profile number to assign if the domain was newly created. | |
649 | * | |
650 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
fdb8ebb7 TH |
651 | * |
652 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 KT |
653 | */ |
654 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
655 | domainname, | |
656 | const u8 profile) | |
657 | { | |
ca0b7df3 | 658 | struct tomoyo_domain_info *entry; |
cd7bec6a | 659 | struct tomoyo_domain_info *domain; |
26a2a1c9 | 660 | const struct tomoyo_path_info *saved_domainname; |
ca0b7df3 | 661 | bool found = false; |
26a2a1c9 | 662 | |
17080008 | 663 | if (!tomoyo_is_correct_domain(domainname)) |
ca0b7df3 | 664 | return NULL; |
bf24fb01 | 665 | saved_domainname = tomoyo_get_name(domainname); |
26a2a1c9 | 666 | if (!saved_domainname) |
ca0b7df3 TH |
667 | return NULL; |
668 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
669 | mutex_lock(&tomoyo_policy_lock); | |
670 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
671 | if (domain->is_deleted || | |
672 | tomoyo_pathcmp(saved_domainname, domain->domainname)) | |
673 | continue; | |
674 | found = true; | |
675 | break; | |
676 | } | |
677 | if (!found && tomoyo_memory_ok(entry)) { | |
678 | INIT_LIST_HEAD(&entry->acl_info_list); | |
679 | entry->domainname = saved_domainname; | |
bf24fb01 | 680 | saved_domainname = NULL; |
ca0b7df3 TH |
681 | entry->profile = profile; |
682 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
683 | domain = entry; | |
684 | entry = NULL; | |
685 | found = true; | |
26a2a1c9 | 686 | } |
f737d95d | 687 | mutex_unlock(&tomoyo_policy_lock); |
bf24fb01 | 688 | tomoyo_put_name(saved_domainname); |
ca0b7df3 TH |
689 | kfree(entry); |
690 | return found ? domain : NULL; | |
26a2a1c9 KT |
691 | } |
692 | ||
693 | /** | |
694 | * tomoyo_find_next_domain - Find a domain. | |
695 | * | |
56f8c9bc | 696 | * @bprm: Pointer to "struct linux_binprm". |
26a2a1c9 KT |
697 | * |
698 | * Returns 0 on success, negative value otherwise. | |
fdb8ebb7 TH |
699 | * |
700 | * Caller holds tomoyo_read_lock(). | |
26a2a1c9 | 701 | */ |
56f8c9bc | 702 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
26a2a1c9 KT |
703 | { |
704 | /* | |
705 | * This function assumes that the size of buffer returned by | |
706 | * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. | |
707 | */ | |
8e2d39a1 | 708 | struct tomoyo_page_buffer *tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
26a2a1c9 KT |
709 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
710 | struct tomoyo_domain_info *domain = NULL; | |
711 | const char *old_domain_name = old_domain->domainname->name; | |
712 | const char *original_name = bprm->filename; | |
713 | char *new_domain_name = NULL; | |
714 | char *real_program_name = NULL; | |
715 | char *symlink_program_name = NULL; | |
716 | const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); | |
717 | const bool is_enforce = (mode == 3); | |
718 | int retval = -ENOMEM; | |
719 | struct tomoyo_path_info r; /* real name */ | |
720 | struct tomoyo_path_info s; /* symlink name */ | |
721 | struct tomoyo_path_info l; /* last name */ | |
722 | static bool initialized; | |
723 | ||
724 | if (!tmp) | |
725 | goto out; | |
726 | ||
727 | if (!initialized) { | |
728 | /* | |
729 | * Built-in initializers. This is needed because policies are | |
730 | * not loaded until starting /sbin/init. | |
731 | */ | |
732 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", | |
733 | false, false); | |
734 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", | |
735 | false, false); | |
736 | initialized = true; | |
737 | } | |
738 | ||
739 | /* Get tomoyo_realpath of program. */ | |
740 | retval = -ENOENT; | |
741 | /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ | |
742 | real_program_name = tomoyo_realpath(original_name); | |
743 | if (!real_program_name) | |
744 | goto out; | |
745 | /* Get tomoyo_realpath of symbolic link. */ | |
746 | symlink_program_name = tomoyo_realpath_nofollow(original_name); | |
747 | if (!symlink_program_name) | |
748 | goto out; | |
749 | ||
750 | r.name = real_program_name; | |
751 | tomoyo_fill_path_info(&r); | |
752 | s.name = symlink_program_name; | |
753 | tomoyo_fill_path_info(&s); | |
754 | l.name = tomoyo_get_last_name(old_domain); | |
755 | tomoyo_fill_path_info(&l); | |
756 | ||
757 | /* Check 'alias' directive. */ | |
758 | if (tomoyo_pathcmp(&r, &s)) { | |
759 | struct tomoyo_alias_entry *ptr; | |
760 | /* Is this program allowed to be called via symbolic links? */ | |
fdb8ebb7 | 761 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
26a2a1c9 KT |
762 | if (ptr->is_deleted || |
763 | tomoyo_pathcmp(&r, ptr->original_name) || | |
764 | tomoyo_pathcmp(&s, ptr->aliased_name)) | |
765 | continue; | |
766 | memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); | |
767 | strncpy(real_program_name, ptr->aliased_name->name, | |
768 | TOMOYO_MAX_PATHNAME_LEN - 1); | |
769 | tomoyo_fill_path_info(&r); | |
770 | break; | |
771 | } | |
26a2a1c9 KT |
772 | } |
773 | ||
774 | /* Check execute permission. */ | |
bcb86975 | 775 | retval = tomoyo_check_exec_perm(old_domain, &r); |
26a2a1c9 KT |
776 | if (retval < 0) |
777 | goto out; | |
778 | ||
779 | new_domain_name = tmp->buffer; | |
780 | if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { | |
781 | /* Transit to the child of tomoyo_kernel_domain domain. */ | |
782 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, | |
783 | TOMOYO_ROOT_NAME " " "%s", real_program_name); | |
784 | } else if (old_domain == &tomoyo_kernel_domain && | |
785 | !tomoyo_policy_loaded) { | |
786 | /* | |
787 | * Needn't to transit from kernel domain before starting | |
788 | * /sbin/init. But transit from kernel domain if executing | |
789 | * initializers because they might start before /sbin/init. | |
790 | */ | |
791 | domain = old_domain; | |
792 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { | |
793 | /* Keep current domain. */ | |
794 | domain = old_domain; | |
795 | } else { | |
796 | /* Normal domain transition. */ | |
797 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, | |
798 | "%s %s", old_domain_name, real_program_name); | |
799 | } | |
800 | if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) | |
801 | goto done; | |
26a2a1c9 | 802 | domain = tomoyo_find_domain(new_domain_name); |
26a2a1c9 KT |
803 | if (domain) |
804 | goto done; | |
805 | if (is_enforce) | |
806 | goto done; | |
807 | domain = tomoyo_find_or_assign_new_domain(new_domain_name, | |
808 | old_domain->profile); | |
809 | done: | |
810 | if (domain) | |
811 | goto out; | |
812 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", | |
813 | new_domain_name); | |
814 | if (is_enforce) | |
815 | retval = -EPERM; | |
816 | else | |
ea13ddba | 817 | old_domain->transition_failed = true; |
26a2a1c9 | 818 | out: |
56f8c9bc TH |
819 | if (!domain) |
820 | domain = old_domain; | |
ec8e6a4e TH |
821 | /* Update reference count on "struct tomoyo_domain_info". */ |
822 | atomic_inc(&domain->users); | |
56f8c9bc | 823 | bprm->cred->security = domain; |
8e2d39a1 TH |
824 | kfree(real_program_name); |
825 | kfree(symlink_program_name); | |
826 | kfree(tmp); | |
26a2a1c9 KT |
827 | return retval; |
828 | } |