1 /*
2 * security/tomoyo/common.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7 #include <linux/uaccess.h>
8 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include "common.h"
11
12 /* String table for operation mode. */
13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
14 [TOMOYO_CONFIG_DISABLED] = "disabled",
15 [TOMOYO_CONFIG_LEARNING] = "learning",
16 [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
17 [TOMOYO_CONFIG_ENFORCING] = "enforcing"
18 };
19
20 /* String table for /sys/kernel/security/tomoyo/profile */
21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
22 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
23 /* CONFIG::file group */
24 [TOMOYO_MAC_FILE_EXECUTE] = "execute",
25 [TOMOYO_MAC_FILE_OPEN] = "open",
26 [TOMOYO_MAC_FILE_CREATE] = "create",
27 [TOMOYO_MAC_FILE_UNLINK] = "unlink",
28 [TOMOYO_MAC_FILE_GETATTR] = "getattr",
29 [TOMOYO_MAC_FILE_MKDIR] = "mkdir",
30 [TOMOYO_MAC_FILE_RMDIR] = "rmdir",
31 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo",
32 [TOMOYO_MAC_FILE_MKSOCK] = "mksock",
33 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate",
34 [TOMOYO_MAC_FILE_SYMLINK] = "symlink",
35 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock",
36 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar",
37 [TOMOYO_MAC_FILE_LINK] = "link",
38 [TOMOYO_MAC_FILE_RENAME] = "rename",
39 [TOMOYO_MAC_FILE_CHMOD] = "chmod",
40 [TOMOYO_MAC_FILE_CHOWN] = "chown",
41 [TOMOYO_MAC_FILE_CHGRP] = "chgrp",
42 [TOMOYO_MAC_FILE_IOCTL] = "ioctl",
43 [TOMOYO_MAC_FILE_CHROOT] = "chroot",
44 [TOMOYO_MAC_FILE_MOUNT] = "mount",
45 [TOMOYO_MAC_FILE_UMOUNT] = "unmount",
46 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
47 /* CONFIG::network group */
48 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind",
49 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen",
50 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect",
51 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind",
52 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send",
53 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind",
54 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send",
55 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind",
56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen",
57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect",
58 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind",
59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send",
60 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind",
61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen",
62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
63 /* CONFIG::misc group */
64 [TOMOYO_MAC_ENVIRON] = "env",
65 /* CONFIG group */
66 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
69 };
70
71 /* String table for conditions. */
72 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
73 [TOMOYO_TASK_UID] = "task.uid",
74 [TOMOYO_TASK_EUID] = "task.euid",
75 [TOMOYO_TASK_SUID] = "task.suid",
76 [TOMOYO_TASK_FSUID] = "task.fsuid",
77 [TOMOYO_TASK_GID] = "task.gid",
78 [TOMOYO_TASK_EGID] = "task.egid",
79 [TOMOYO_TASK_SGID] = "task.sgid",
80 [TOMOYO_TASK_FSGID] = "task.fsgid",
81 [TOMOYO_TASK_PID] = "task.pid",
82 [TOMOYO_TASK_PPID] = "task.ppid",
83 [TOMOYO_EXEC_ARGC] = "exec.argc",
84 [TOMOYO_EXEC_ENVC] = "exec.envc",
85 [TOMOYO_TYPE_IS_SOCKET] = "socket",
86 [TOMOYO_TYPE_IS_SYMLINK] = "symlink",
87 [TOMOYO_TYPE_IS_FILE] = "file",
88 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
89 [TOMOYO_TYPE_IS_DIRECTORY] = "directory",
90 [TOMOYO_TYPE_IS_CHAR_DEV] = "char",
91 [TOMOYO_TYPE_IS_FIFO] = "fifo",
92 [TOMOYO_MODE_SETUID] = "setuid",
93 [TOMOYO_MODE_SETGID] = "setgid",
94 [TOMOYO_MODE_STICKY] = "sticky",
95 [TOMOYO_MODE_OWNER_READ] = "owner_read",
96 [TOMOYO_MODE_OWNER_WRITE] = "owner_write",
97 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
98 [TOMOYO_MODE_GROUP_READ] = "group_read",
99 [TOMOYO_MODE_GROUP_WRITE] = "group_write",
100 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
101 [TOMOYO_MODE_OTHERS_READ] = "others_read",
102 [TOMOYO_MODE_OTHERS_WRITE] = "others_write",
103 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
104 [TOMOYO_EXEC_REALPATH] = "exec.realpath",
105 [TOMOYO_SYMLINK_TARGET] = "symlink.target",
106 [TOMOYO_PATH1_UID] = "path1.uid",
107 [TOMOYO_PATH1_GID] = "path1.gid",
108 [TOMOYO_PATH1_INO] = "path1.ino",
109 [TOMOYO_PATH1_MAJOR] = "path1.major",
110 [TOMOYO_PATH1_MINOR] = "path1.minor",
111 [TOMOYO_PATH1_PERM] = "path1.perm",
112 [TOMOYO_PATH1_TYPE] = "path1.type",
113 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
114 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
115 [TOMOYO_PATH2_UID] = "path2.uid",
116 [TOMOYO_PATH2_GID] = "path2.gid",
117 [TOMOYO_PATH2_INO] = "path2.ino",
118 [TOMOYO_PATH2_MAJOR] = "path2.major",
119 [TOMOYO_PATH2_MINOR] = "path2.minor",
120 [TOMOYO_PATH2_PERM] = "path2.perm",
121 [TOMOYO_PATH2_TYPE] = "path2.type",
122 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
123 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
124 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
125 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
126 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
127 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
128 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
129 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
130 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
131 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
132 };
133
134 /* String table for PREFERENCE keyword. */
135 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
136 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
137 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
138 };
139
140 /* String table for path operation. */
141 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
142 [TOMOYO_TYPE_EXECUTE] = "execute",
143 [TOMOYO_TYPE_READ] = "read",
144 [TOMOYO_TYPE_WRITE] = "write",
145 [TOMOYO_TYPE_APPEND] = "append",
146 [TOMOYO_TYPE_UNLINK] = "unlink",
147 [TOMOYO_TYPE_GETATTR] = "getattr",
148 [TOMOYO_TYPE_RMDIR] = "rmdir",
149 [TOMOYO_TYPE_TRUNCATE] = "truncate",
150 [TOMOYO_TYPE_SYMLINK] = "symlink",
151 [TOMOYO_TYPE_CHROOT] = "chroot",
152 [TOMOYO_TYPE_UMOUNT] = "unmount",
153 };
154
155 /* String table for socket's operation. */
156 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
157 [TOMOYO_NETWORK_BIND] = "bind",
158 [TOMOYO_NETWORK_LISTEN] = "listen",
159 [TOMOYO_NETWORK_CONNECT] = "connect",
160 [TOMOYO_NETWORK_SEND] = "send",
161 };
162
163 /* String table for categories. */
164 static const char * const tomoyo_category_keywords
165 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
166 [TOMOYO_MAC_CATEGORY_FILE] = "file",
167 [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
168 [TOMOYO_MAC_CATEGORY_MISC] = "misc",
169 };
170
171 /* Permit policy management by non-root user? */
172 static bool tomoyo_manage_by_non_root;
173
174 /* Utility functions. */
175
176 /**
177 * tomoyo_yesno - Return "yes" or "no".
178 *
179 * @value: Bool value.
180 */
tomoyo_yesno(const unsigned int value)181 const char *tomoyo_yesno(const unsigned int value)
182 {
183 return value ? "yes" : "no";
184 }
185
186 /**
187 * tomoyo_addprintf - strncat()-like-snprintf().
188 *
189 * @buffer: Buffer to write to. Must be '\0'-terminated.
190 * @len: Size of @buffer.
191 * @fmt: The printf()'s format string, followed by parameters.
192 *
193 * Returns nothing.
194 */
tomoyo_addprintf(char * buffer,int len,const char * fmt,...)195 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
196 {
197 va_list args;
198 const int pos = strlen(buffer);
199 va_start(args, fmt);
200 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
201 va_end(args);
202 }
203
204 /**
205 * tomoyo_flush - Flush queued string to userspace's buffer.
206 *
207 * @head: Pointer to "struct tomoyo_io_buffer".
208 *
209 * Returns true if all data was flushed, false otherwise.
210 */
tomoyo_flush(struct tomoyo_io_buffer * head)211 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
212 {
213 while (head->r.w_pos) {
214 const char *w = head->r.w[0];
215 size_t len = strlen(w);
216 if (len) {
217 if (len > head->read_user_buf_avail)
218 len = head->read_user_buf_avail;
219 if (!len)
220 return false;
221 if (copy_to_user(head->read_user_buf, w, len))
222 return false;
223 head->read_user_buf_avail -= len;
224 head->read_user_buf += len;
225 w += len;
226 }
227 head->r.w[0] = w;
228 if (*w)
229 return false;
230 /* Add '\0' for audit logs and query. */
231 if (head->poll) {
232 if (!head->read_user_buf_avail ||
233 copy_to_user(head->read_user_buf, "", 1))
234 return false;
235 head->read_user_buf_avail--;
236 head->read_user_buf++;
237 }
238 head->r.w_pos--;
239 for (len = 0; len < head->r.w_pos; len++)
240 head->r.w[len] = head->r.w[len + 1];
241 }
242 head->r.avail = 0;
243 return true;
244 }
245
246 /**
247 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
248 *
249 * @head: Pointer to "struct tomoyo_io_buffer".
250 * @string: String to print.
251 *
252 * Note that @string has to be kept valid until @head is kfree()d.
253 * This means that char[] allocated on stack memory cannot be passed to
254 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
255 */
tomoyo_set_string(struct tomoyo_io_buffer * head,const char * string)256 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
257 {
258 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
259 head->r.w[head->r.w_pos++] = string;
260 tomoyo_flush(head);
261 } else
262 WARN_ON(1);
263 }
264
265 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
266 ...) __printf(2, 3);
267
268 /**
269 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
270 *
271 * @head: Pointer to "struct tomoyo_io_buffer".
272 * @fmt: The printf()'s format string, followed by parameters.
273 */
tomoyo_io_printf(struct tomoyo_io_buffer * head,const char * fmt,...)274 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
275 ...)
276 {
277 va_list args;
278 size_t len;
279 size_t pos = head->r.avail;
280 int size = head->readbuf_size - pos;
281 if (size <= 0)
282 return;
283 va_start(args, fmt);
284 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
285 va_end(args);
286 if (pos + len >= head->readbuf_size) {
287 WARN_ON(1);
288 return;
289 }
290 head->r.avail += len;
291 tomoyo_set_string(head, head->read_buf + pos);
292 }
293
294 /**
295 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
296 *
297 * @head: Pointer to "struct tomoyo_io_buffer".
298 *
299 * Returns nothing.
300 */
tomoyo_set_space(struct tomoyo_io_buffer * head)301 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
302 {
303 tomoyo_set_string(head, " ");
304 }
305
306 /**
307 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
308 *
309 * @head: Pointer to "struct tomoyo_io_buffer".
310 *
311 * Returns nothing.
312 */
tomoyo_set_lf(struct tomoyo_io_buffer * head)313 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
314 {
315 tomoyo_set_string(head, "\n");
316 return !head->r.w_pos;
317 }
318
319 /**
320 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
321 *
322 * @head: Pointer to "struct tomoyo_io_buffer".
323 *
324 * Returns nothing.
325 */
tomoyo_set_slash(struct tomoyo_io_buffer * head)326 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
327 {
328 tomoyo_set_string(head, "/");
329 }
330
331 /* List of namespaces. */
332 LIST_HEAD(tomoyo_namespace_list);
333 /* True if namespace other than tomoyo_kernel_namespace is defined. */
334 static bool tomoyo_namespace_enabled;
335
336 /**
337 * tomoyo_init_policy_namespace - Initialize namespace.
338 *
339 * @ns: Pointer to "struct tomoyo_policy_namespace".
340 *
341 * Returns nothing.
342 */
tomoyo_init_policy_namespace(struct tomoyo_policy_namespace * ns)343 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
344 {
345 unsigned int idx;
346 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
347 INIT_LIST_HEAD(&ns->acl_group[idx]);
348 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
349 INIT_LIST_HEAD(&ns->group_list[idx]);
350 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
351 INIT_LIST_HEAD(&ns->policy_list[idx]);
352 ns->profile_version = 20110903;
353 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
354 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
355 }
356
357 /**
358 * tomoyo_print_namespace - Print namespace header.
359 *
360 * @head: Pointer to "struct tomoyo_io_buffer".
361 *
362 * Returns nothing.
363 */
tomoyo_print_namespace(struct tomoyo_io_buffer * head)364 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
365 {
366 if (!tomoyo_namespace_enabled)
367 return;
368 tomoyo_set_string(head,
369 container_of(head->r.ns,
370 struct tomoyo_policy_namespace,
371 namespace_list)->name);
372 tomoyo_set_space(head);
373 }
374
375 /**
376 * tomoyo_print_name_union - Print a tomoyo_name_union.
377 *
378 * @head: Pointer to "struct tomoyo_io_buffer".
379 * @ptr: Pointer to "struct tomoyo_name_union".
380 */
tomoyo_print_name_union(struct tomoyo_io_buffer * head,const struct tomoyo_name_union * ptr)381 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
382 const struct tomoyo_name_union *ptr)
383 {
384 tomoyo_set_space(head);
385 if (ptr->group) {
386 tomoyo_set_string(head, "@");
387 tomoyo_set_string(head, ptr->group->group_name->name);
388 } else {
389 tomoyo_set_string(head, ptr->filename->name);
390 }
391 }
392
393 /**
394 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
395 *
396 * @head: Pointer to "struct tomoyo_io_buffer".
397 * @ptr: Pointer to "struct tomoyo_name_union".
398 *
399 * Returns nothing.
400 */
tomoyo_print_name_union_quoted(struct tomoyo_io_buffer * head,const struct tomoyo_name_union * ptr)401 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
402 const struct tomoyo_name_union *ptr)
403 {
404 if (ptr->group) {
405 tomoyo_set_string(head, "@");
406 tomoyo_set_string(head, ptr->group->group_name->name);
407 } else {
408 tomoyo_set_string(head, "\"");
409 tomoyo_set_string(head, ptr->filename->name);
410 tomoyo_set_string(head, "\"");
411 }
412 }
413
414 /**
415 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
416 *
417 * @head: Pointer to "struct tomoyo_io_buffer".
418 * @ptr: Pointer to "struct tomoyo_number_union".
419 *
420 * Returns nothing.
421 */
tomoyo_print_number_union_nospace(struct tomoyo_io_buffer * head,const struct tomoyo_number_union * ptr)422 static void tomoyo_print_number_union_nospace
423 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
424 {
425 if (ptr->group) {
426 tomoyo_set_string(head, "@");
427 tomoyo_set_string(head, ptr->group->group_name->name);
428 } else {
429 int i;
430 unsigned long min = ptr->values[0];
431 const unsigned long max = ptr->values[1];
432 u8 min_type = ptr->value_type[0];
433 const u8 max_type = ptr->value_type[1];
434 char buffer[128];
435 buffer[0] = '\0';
436 for (i = 0; i < 2; i++) {
437 switch (min_type) {
438 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
439 tomoyo_addprintf(buffer, sizeof(buffer),
440 "0x%lX", min);
441 break;
442 case TOMOYO_VALUE_TYPE_OCTAL:
443 tomoyo_addprintf(buffer, sizeof(buffer),
444 "0%lo", min);
445 break;
446 default:
447 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
448 min);
449 break;
450 }
451 if (min == max && min_type == max_type)
452 break;
453 tomoyo_addprintf(buffer, sizeof(buffer), "-");
454 min_type = max_type;
455 min = max;
456 }
457 tomoyo_io_printf(head, "%s", buffer);
458 }
459 }
460
461 /**
462 * tomoyo_print_number_union - Print a tomoyo_number_union.
463 *
464 * @head: Pointer to "struct tomoyo_io_buffer".
465 * @ptr: Pointer to "struct tomoyo_number_union".
466 *
467 * Returns nothing.
468 */
tomoyo_print_number_union(struct tomoyo_io_buffer * head,const struct tomoyo_number_union * ptr)469 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
470 const struct tomoyo_number_union *ptr)
471 {
472 tomoyo_set_space(head);
473 tomoyo_print_number_union_nospace(head, ptr);
474 }
475
476 /**
477 * tomoyo_assign_profile - Create a new profile.
478 *
479 * @ns: Pointer to "struct tomoyo_policy_namespace".
480 * @profile: Profile number to create.
481 *
482 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
483 */
tomoyo_assign_profile(struct tomoyo_policy_namespace * ns,const unsigned int profile)484 static struct tomoyo_profile *tomoyo_assign_profile
485 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
486 {
487 struct tomoyo_profile *ptr;
488 struct tomoyo_profile *entry;
489 if (profile >= TOMOYO_MAX_PROFILES)
490 return NULL;
491 ptr = ns->profile_ptr[profile];
492 if (ptr)
493 return ptr;
494 entry = kzalloc(sizeof(*entry), GFP_NOFS);
495 if (mutex_lock_interruptible(&tomoyo_policy_lock))
496 goto out;
497 ptr = ns->profile_ptr[profile];
498 if (!ptr && tomoyo_memory_ok(entry)) {
499 ptr = entry;
500 ptr->default_config = TOMOYO_CONFIG_DISABLED |
501 TOMOYO_CONFIG_WANT_GRANT_LOG |
502 TOMOYO_CONFIG_WANT_REJECT_LOG;
503 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
504 sizeof(ptr->config));
505 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
506 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
507 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
508 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
509 mb(); /* Avoid out-of-order execution. */
510 ns->profile_ptr[profile] = ptr;
511 entry = NULL;
512 }
513 mutex_unlock(&tomoyo_policy_lock);
514 out:
515 kfree(entry);
516 return ptr;
517 }
518
519 /**
520 * tomoyo_profile - Find a profile.
521 *
522 * @ns: Pointer to "struct tomoyo_policy_namespace".
523 * @profile: Profile number to find.
524 *
525 * Returns pointer to "struct tomoyo_profile".
526 */
tomoyo_profile(const struct tomoyo_policy_namespace * ns,const u8 profile)527 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
528 const u8 profile)
529 {
530 static struct tomoyo_profile tomoyo_null_profile;
531 struct tomoyo_profile *ptr = ns->profile_ptr[profile];
532 if (!ptr)
533 ptr = &tomoyo_null_profile;
534 return ptr;
535 }
536
537 /**
538 * tomoyo_find_yesno - Find values for specified keyword.
539 *
540 * @string: String to check.
541 * @find: Name of keyword.
542 *
543 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
544 */
tomoyo_find_yesno(const char * string,const char * find)545 static s8 tomoyo_find_yesno(const char *string, const char *find)
546 {
547 const char *cp = strstr(string, find);
548 if (cp) {
549 cp += strlen(find);
550 if (!strncmp(cp, "=yes", 4))
551 return 1;
552 else if (!strncmp(cp, "=no", 3))
553 return 0;
554 }
555 return -1;
556 }
557
558 /**
559 * tomoyo_set_uint - Set value for specified preference.
560 *
561 * @i: Pointer to "unsigned int".
562 * @string: String to check.
563 * @find: Name of keyword.
564 *
565 * Returns nothing.
566 */
tomoyo_set_uint(unsigned int * i,const char * string,const char * find)567 static void tomoyo_set_uint(unsigned int *i, const char *string,
568 const char *find)
569 {
570 const char *cp = strstr(string, find);
571 if (cp)
572 sscanf(cp + strlen(find), "=%u", i);
573 }
574
575 /**
576 * tomoyo_set_mode - Set mode for specified profile.
577 *
578 * @name: Name of functionality.
579 * @value: Mode for @name.
580 * @profile: Pointer to "struct tomoyo_profile".
581 *
582 * Returns 0 on success, negative value otherwise.
583 */
tomoyo_set_mode(char * name,const char * value,struct tomoyo_profile * profile)584 static int tomoyo_set_mode(char *name, const char *value,
585 struct tomoyo_profile *profile)
586 {
587 u8 i;
588 u8 config;
589 if (!strcmp(name, "CONFIG")) {
590 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
591 config = profile->default_config;
592 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
593 config = 0;
594 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
595 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
596 int len = 0;
597 if (i < TOMOYO_MAX_MAC_INDEX) {
598 const u8 c = tomoyo_index2category[i];
599 const char *category =
600 tomoyo_category_keywords[c];
601 len = strlen(category);
602 if (strncmp(name, category, len) ||
603 name[len++] != ':' || name[len++] != ':')
604 continue;
605 }
606 if (strcmp(name + len, tomoyo_mac_keywords[i]))
607 continue;
608 config = profile->config[i];
609 break;
610 }
611 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
612 return -EINVAL;
613 } else {
614 return -EINVAL;
615 }
616 if (strstr(value, "use_default")) {
617 config = TOMOYO_CONFIG_USE_DEFAULT;
618 } else {
619 u8 mode;
620 for (mode = 0; mode < 4; mode++)
621 if (strstr(value, tomoyo_mode[mode]))
622 /*
623 * Update lower 3 bits in order to distinguish
624 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
625 */
626 config = (config & ~7) | mode;
627 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
628 switch (tomoyo_find_yesno(value, "grant_log")) {
629 case 1:
630 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
631 break;
632 case 0:
633 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
634 break;
635 }
636 switch (tomoyo_find_yesno(value, "reject_log")) {
637 case 1:
638 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
639 break;
640 case 0:
641 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
642 break;
643 }
644 }
645 }
646 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
647 profile->config[i] = config;
648 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
649 profile->default_config = config;
650 return 0;
651 }
652
653 /**
654 * tomoyo_write_profile - Write profile table.
655 *
656 * @head: Pointer to "struct tomoyo_io_buffer".
657 *
658 * Returns 0 on success, negative value otherwise.
659 */
tomoyo_write_profile(struct tomoyo_io_buffer * head)660 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
661 {
662 char *data = head->write_buf;
663 unsigned int i;
664 char *cp;
665 struct tomoyo_profile *profile;
666 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
667 == 1)
668 return 0;
669 i = simple_strtoul(data, &cp, 10);
670 if (*cp != '-')
671 return -EINVAL;
672 data = cp + 1;
673 profile = tomoyo_assign_profile(head->w.ns, i);
674 if (!profile)
675 return -EINVAL;
676 cp = strchr(data, '=');
677 if (!cp)
678 return -EINVAL;
679 *cp++ = '\0';
680 if (!strcmp(data, "COMMENT")) {
681 static DEFINE_SPINLOCK(lock);
682 const struct tomoyo_path_info *new_comment
683 = tomoyo_get_name(cp);
684 const struct tomoyo_path_info *old_comment;
685 if (!new_comment)
686 return -ENOMEM;
687 spin_lock(&lock);
688 old_comment = profile->comment;
689 profile->comment = new_comment;
690 spin_unlock(&lock);
691 tomoyo_put_name(old_comment);
692 return 0;
693 }
694 if (!strcmp(data, "PREFERENCE")) {
695 for (i = 0; i < TOMOYO_MAX_PREF; i++)
696 tomoyo_set_uint(&profile->pref[i], cp,
697 tomoyo_pref_keywords[i]);
698 return 0;
699 }
700 return tomoyo_set_mode(data, cp, profile);
701 }
702
703 /**
704 * tomoyo_print_config - Print mode for specified functionality.
705 *
706 * @head: Pointer to "struct tomoyo_io_buffer".
707 * @config: Mode for that functionality.
708 *
709 * Returns nothing.
710 *
711 * Caller prints functionality's name.
712 */
tomoyo_print_config(struct tomoyo_io_buffer * head,const u8 config)713 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
714 {
715 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
716 tomoyo_mode[config & 3],
717 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
718 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
719 }
720
721 /**
722 * tomoyo_read_profile - Read profile table.
723 *
724 * @head: Pointer to "struct tomoyo_io_buffer".
725 *
726 * Returns nothing.
727 */
tomoyo_read_profile(struct tomoyo_io_buffer * head)728 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
729 {
730 u8 index;
731 struct tomoyo_policy_namespace *ns =
732 container_of(head->r.ns, typeof(*ns), namespace_list);
733 const struct tomoyo_profile *profile;
734 if (head->r.eof)
735 return;
736 next:
737 index = head->r.index;
738 profile = ns->profile_ptr[index];
739 switch (head->r.step) {
740 case 0:
741 tomoyo_print_namespace(head);
742 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
743 ns->profile_version);
744 head->r.step++;
745 break;
746 case 1:
747 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
748 head->r.index++)
749 if (ns->profile_ptr[head->r.index])
750 break;
751 if (head->r.index == TOMOYO_MAX_PROFILES) {
752 head->r.eof = true;
753 return;
754 }
755 head->r.step++;
756 break;
757 case 2:
758 {
759 u8 i;
760 const struct tomoyo_path_info *comment =
761 profile->comment;
762 tomoyo_print_namespace(head);
763 tomoyo_io_printf(head, "%u-COMMENT=", index);
764 tomoyo_set_string(head, comment ? comment->name : "");
765 tomoyo_set_lf(head);
766 tomoyo_print_namespace(head);
767 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
768 for (i = 0; i < TOMOYO_MAX_PREF; i++)
769 tomoyo_io_printf(head, "%s=%u ",
770 tomoyo_pref_keywords[i],
771 profile->pref[i]);
772 tomoyo_set_string(head, "}\n");
773 head->r.step++;
774 }
775 break;
776 case 3:
777 {
778 tomoyo_print_namespace(head);
779 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
780 tomoyo_print_config(head, profile->default_config);
781 head->r.bit = 0;
782 head->r.step++;
783 }
784 break;
785 case 4:
786 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
787 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
788 const u8 i = head->r.bit;
789 const u8 config = profile->config[i];
790 if (config == TOMOYO_CONFIG_USE_DEFAULT)
791 continue;
792 tomoyo_print_namespace(head);
793 if (i < TOMOYO_MAX_MAC_INDEX)
794 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
795 index,
796 tomoyo_category_keywords
797 [tomoyo_index2category[i]],
798 tomoyo_mac_keywords[i]);
799 else
800 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
801 tomoyo_mac_keywords[i]);
802 tomoyo_print_config(head, config);
803 head->r.bit++;
804 break;
805 }
806 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
807 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
808 head->r.index++;
809 head->r.step = 1;
810 }
811 break;
812 }
813 if (tomoyo_flush(head))
814 goto next;
815 }
816
817 /**
818 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
819 *
820 * @a: Pointer to "struct tomoyo_acl_head".
821 * @b: Pointer to "struct tomoyo_acl_head".
822 *
823 * Returns true if @a == @b, false otherwise.
824 */
tomoyo_same_manager(const struct tomoyo_acl_head * a,const struct tomoyo_acl_head * b)825 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
826 const struct tomoyo_acl_head *b)
827 {
828 return container_of(a, struct tomoyo_manager, head)->manager ==
829 container_of(b, struct tomoyo_manager, head)->manager;
830 }
831
832 /**
833 * tomoyo_update_manager_entry - Add a manager entry.
834 *
835 * @manager: The path to manager or the domainnamme.
836 * @is_delete: True if it is a delete request.
837 *
838 * Returns 0 on success, negative value otherwise.
839 *
840 * Caller holds tomoyo_read_lock().
841 */
tomoyo_update_manager_entry(const char * manager,const bool is_delete)842 static int tomoyo_update_manager_entry(const char *manager,
843 const bool is_delete)
844 {
845 struct tomoyo_manager e = { };
846 struct tomoyo_acl_param param = {
847 /* .ns = &tomoyo_kernel_namespace, */
848 .is_delete = is_delete,
849 .list = &tomoyo_kernel_namespace.
850 policy_list[TOMOYO_ID_MANAGER],
851 };
852 int error = is_delete ? -ENOENT : -ENOMEM;
853 if (!tomoyo_correct_domain(manager) &&
854 !tomoyo_correct_word(manager))
855 return -EINVAL;
856 e.manager = tomoyo_get_name(manager);
857 if (e.manager) {
858 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m,
859 tomoyo_same_manager);
860 tomoyo_put_name(e.manager);
861 }
862 return error;
863 }
864
865 /**
866 * tomoyo_write_manager - Write manager policy.
867 *
868 * @head: Pointer to "struct tomoyo_io_buffer".
869 *
870 * Returns 0 on success, negative value otherwise.
871 *
872 * Caller holds tomoyo_read_lock().
873 */
tomoyo_write_manager(struct tomoyo_io_buffer * head)874 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
875 {
876 char *data = head->write_buf;
877
878 if (!strcmp(data, "manage_by_non_root")) {
879 tomoyo_manage_by_non_root = !head->w.is_delete;
880 return 0;
881 }
882 return tomoyo_update_manager_entry(data, head->w.is_delete);
883 }
884
885 /**
886 * tomoyo_read_manager - Read manager policy.
887 *
888 * @head: Pointer to "struct tomoyo_io_buffer".
889 *
890 * Caller holds tomoyo_read_lock().
891 */
tomoyo_read_manager(struct tomoyo_io_buffer * head)892 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
893 {
894 if (head->r.eof)
895 return;
896 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
897 policy_list[TOMOYO_ID_MANAGER]) {
898 struct tomoyo_manager *ptr =
899 list_entry(head->r.acl, typeof(*ptr), head.list);
900 if (ptr->head.is_deleted)
901 continue;
902 if (!tomoyo_flush(head))
903 return;
904 tomoyo_set_string(head, ptr->manager->name);
905 tomoyo_set_lf(head);
906 }
907 head->r.eof = true;
908 }
909
910 /**
911 * tomoyo_manager - Check whether the current process is a policy manager.
912 *
913 * Returns true if the current process is permitted to modify policy
914 * via /sys/kernel/security/tomoyo/ interface.
915 *
916 * Caller holds tomoyo_read_lock().
917 */
tomoyo_manager(void)918 static bool tomoyo_manager(void)
919 {
920 struct tomoyo_manager *ptr;
921 const char *exe;
922 const struct task_struct *task = current;
923 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
924 bool found = false;
925
926 if (!tomoyo_policy_loaded)
927 return true;
928 if (!tomoyo_manage_by_non_root &&
929 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) ||
930 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
931 return false;
932 exe = tomoyo_get_exe();
933 if (!exe)
934 return false;
935 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
936 policy_list[TOMOYO_ID_MANAGER], head.list) {
937 if (!ptr->head.is_deleted &&
938 (!tomoyo_pathcmp(domainname, ptr->manager) ||
939 !strcmp(exe, ptr->manager->name))) {
940 found = true;
941 break;
942 }
943 }
944 if (!found) { /* Reduce error messages. */
945 static pid_t last_pid;
946 const pid_t pid = current->pid;
947 if (last_pid != pid) {
948 printk(KERN_WARNING "%s ( %s ) is not permitted to "
949 "update policies.\n", domainname->name, exe);
950 last_pid = pid;
951 }
952 }
953 kfree(exe);
954 return found;
955 }
956
957 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
958 (unsigned int serial);
959
960 /**
961 * tomoyo_select_domain - Parse select command.
962 *
963 * @head: Pointer to "struct tomoyo_io_buffer".
964 * @data: String to parse.
965 *
966 * Returns true on success, false otherwise.
967 *
968 * Caller holds tomoyo_read_lock().
969 */
tomoyo_select_domain(struct tomoyo_io_buffer * head,const char * data)970 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
971 const char *data)
972 {
973 unsigned int pid;
974 struct tomoyo_domain_info *domain = NULL;
975 bool global_pid = false;
976 if (strncmp(data, "select ", 7))
977 return false;
978 data += 7;
979 if (sscanf(data, "pid=%u", &pid) == 1 ||
980 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
981 struct task_struct *p;
982 rcu_read_lock();
983 if (global_pid)
984 p = find_task_by_pid_ns(pid, &init_pid_ns);
985 else
986 p = find_task_by_vpid(pid);
987 if (p)
988 domain = tomoyo_real_domain(p);
989 rcu_read_unlock();
990 } else if (!strncmp(data, "domain=", 7)) {
991 if (tomoyo_domain_def(data + 7))
992 domain = tomoyo_find_domain(data + 7);
993 } else if (sscanf(data, "Q=%u", &pid) == 1) {
994 domain = tomoyo_find_domain_by_qid(pid);
995 } else
996 return false;
997 head->w.domain = domain;
998 /* Accessing read_buf is safe because head->io_sem is held. */
999 if (!head->read_buf)
1000 return true; /* Do nothing if open(O_WRONLY). */
1001 memset(&head->r, 0, sizeof(head->r));
1002 head->r.print_this_domain_only = true;
1003 if (domain)
1004 head->r.domain = &domain->list;
1005 else
1006 head->r.eof = 1;
1007 tomoyo_io_printf(head, "# select %s\n", data);
1008 if (domain && domain->is_deleted)
1009 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010 return true;
1011 }
1012
1013 /**
1014 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1015 *
1016 * @a: Pointer to "struct tomoyo_acl_info".
1017 * @b: Pointer to "struct tomoyo_acl_info".
1018 *
1019 * Returns true if @a == @b, false otherwise.
1020 */
tomoyo_same_task_acl(const struct tomoyo_acl_info * a,const struct tomoyo_acl_info * b)1021 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1022 const struct tomoyo_acl_info *b)
1023 {
1024 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1025 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1026 return p1->domainname == p2->domainname;
1027 }
1028
1029 /**
1030 * tomoyo_write_task - Update task related list.
1031 *
1032 * @param: Pointer to "struct tomoyo_acl_param".
1033 *
1034 * Returns 0 on success, negative value otherwise.
1035 *
1036 * Caller holds tomoyo_read_lock().
1037 */
tomoyo_write_task(struct tomoyo_acl_param * param)1038 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1039 {
1040 int error = -EINVAL;
1041 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
1042 struct tomoyo_task_acl e = {
1043 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1044 .domainname = tomoyo_get_domainname(param),
1045 };
1046 if (e.domainname)
1047 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1048 tomoyo_same_task_acl,
1049 NULL);
1050 tomoyo_put_name(e.domainname);
1051 }
1052 return error;
1053 }
1054
1055 /**
1056 * tomoyo_delete_domain - Delete a domain.
1057 *
1058 * @domainname: The name of domain.
1059 *
1060 * Returns 0 on success, negative value otherwise.
1061 *
1062 * Caller holds tomoyo_read_lock().
1063 */
tomoyo_delete_domain(char * domainname)1064 static int tomoyo_delete_domain(char *domainname)
1065 {
1066 struct tomoyo_domain_info *domain;
1067 struct tomoyo_path_info name;
1068
1069 name.name = domainname;
1070 tomoyo_fill_path_info(&name);
1071 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1072 return -EINTR;
1073 /* Is there an active domain? */
1074 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1075 /* Never delete tomoyo_kernel_domain */
1076 if (domain == &tomoyo_kernel_domain)
1077 continue;
1078 if (domain->is_deleted ||
1079 tomoyo_pathcmp(domain->domainname, &name))
1080 continue;
1081 domain->is_deleted = true;
1082 break;
1083 }
1084 mutex_unlock(&tomoyo_policy_lock);
1085 return 0;
1086 }
1087
1088 /**
1089 * tomoyo_write_domain2 - Write domain policy.
1090 *
1091 * @ns: Pointer to "struct tomoyo_policy_namespace".
1092 * @list: Pointer to "struct list_head".
1093 * @data: Policy to be interpreted.
1094 * @is_delete: True if it is a delete request.
1095 *
1096 * Returns 0 on success, negative value otherwise.
1097 *
1098 * Caller holds tomoyo_read_lock().
1099 */
tomoyo_write_domain2(struct tomoyo_policy_namespace * ns,struct list_head * list,char * data,const bool is_delete)1100 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1101 struct list_head *list, char *data,
1102 const bool is_delete)
1103 {
1104 struct tomoyo_acl_param param = {
1105 .ns = ns,
1106 .list = list,
1107 .data = data,
1108 .is_delete = is_delete,
1109 };
1110 static const struct {
1111 const char *keyword;
1112 int (*write) (struct tomoyo_acl_param *);
1113 } tomoyo_callback[5] = {
1114 { "file ", tomoyo_write_file },
1115 { "network inet ", tomoyo_write_inet_network },
1116 { "network unix ", tomoyo_write_unix_network },
1117 { "misc ", tomoyo_write_misc },
1118 { "task ", tomoyo_write_task },
1119 };
1120 u8 i;
1121
1122 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1123 if (!tomoyo_str_starts(¶m.data,
1124 tomoyo_callback[i].keyword))
1125 continue;
1126 return tomoyo_callback[i].write(¶m);
1127 }
1128 return -EINVAL;
1129 }
1130
1131 /* String table for domain flags. */
1132 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1133 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1134 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1135 };
1136
1137 /**
1138 * tomoyo_write_domain - Write domain policy.
1139 *
1140 * @head: Pointer to "struct tomoyo_io_buffer".
1141 *
1142 * Returns 0 on success, negative value otherwise.
1143 *
1144 * Caller holds tomoyo_read_lock().
1145 */
tomoyo_write_domain(struct tomoyo_io_buffer * head)1146 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1147 {
1148 char *data = head->write_buf;
1149 struct tomoyo_policy_namespace *ns;
1150 struct tomoyo_domain_info *domain = head->w.domain;
1151 const bool is_delete = head->w.is_delete;
1152 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1153 unsigned int profile;
1154 if (*data == '<') {
1155 int ret = 0;
1156 domain = NULL;
1157 if (is_delete)
1158 ret = tomoyo_delete_domain(data);
1159 else if (is_select)
1160 domain = tomoyo_find_domain(data);
1161 else
1162 domain = tomoyo_assign_domain(data, false);
1163 head->w.domain = domain;
1164 return ret;
1165 }
1166 if (!domain)
1167 return -EINVAL;
1168 ns = domain->ns;
1169 if (sscanf(data, "use_profile %u", &profile) == 1
1170 && profile < TOMOYO_MAX_PROFILES) {
1171 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1172 domain->profile = (u8) profile;
1173 return 0;
1174 }
1175 if (sscanf(data, "use_group %u\n", &profile) == 1
1176 && profile < TOMOYO_MAX_ACL_GROUPS) {
1177 if (!is_delete)
1178 domain->group = (u8) profile;
1179 return 0;
1180 }
1181 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1182 const char *cp = tomoyo_dif[profile];
1183 if (strncmp(data, cp, strlen(cp) - 1))
1184 continue;
1185 domain->flags[profile] = !is_delete;
1186 return 0;
1187 }
1188 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1189 is_delete);
1190 }
1191
1192 /**
1193 * tomoyo_print_condition - Print condition part.
1194 *
1195 * @head: Pointer to "struct tomoyo_io_buffer".
1196 * @cond: Pointer to "struct tomoyo_condition".
1197 *
1198 * Returns true on success, false otherwise.
1199 */
tomoyo_print_condition(struct tomoyo_io_buffer * head,const struct tomoyo_condition * cond)1200 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1201 const struct tomoyo_condition *cond)
1202 {
1203 switch (head->r.cond_step) {
1204 case 0:
1205 head->r.cond_index = 0;
1206 head->r.cond_step++;
1207 if (cond->transit) {
1208 tomoyo_set_space(head);
1209 tomoyo_set_string(head, cond->transit->name);
1210 }
1211 /* fall through */
1212 case 1:
1213 {
1214 const u16 condc = cond->condc;
1215 const struct tomoyo_condition_element *condp =
1216 (typeof(condp)) (cond + 1);
1217 const struct tomoyo_number_union *numbers_p =
1218 (typeof(numbers_p)) (condp + condc);
1219 const struct tomoyo_name_union *names_p =
1220 (typeof(names_p))
1221 (numbers_p + cond->numbers_count);
1222 const struct tomoyo_argv *argv =
1223 (typeof(argv)) (names_p + cond->names_count);
1224 const struct tomoyo_envp *envp =
1225 (typeof(envp)) (argv + cond->argc);
1226 u16 skip;
1227 for (skip = 0; skip < head->r.cond_index; skip++) {
1228 const u8 left = condp->left;
1229 const u8 right = condp->right;
1230 condp++;
1231 switch (left) {
1232 case TOMOYO_ARGV_ENTRY:
1233 argv++;
1234 continue;
1235 case TOMOYO_ENVP_ENTRY:
1236 envp++;
1237 continue;
1238 case TOMOYO_NUMBER_UNION:
1239 numbers_p++;
1240 break;
1241 }
1242 switch (right) {
1243 case TOMOYO_NAME_UNION:
1244 names_p++;
1245 break;
1246 case TOMOYO_NUMBER_UNION:
1247 numbers_p++;
1248 break;
1249 }
1250 }
1251 while (head->r.cond_index < condc) {
1252 const u8 match = condp->equals;
1253 const u8 left = condp->left;
1254 const u8 right = condp->right;
1255 if (!tomoyo_flush(head))
1256 return false;
1257 condp++;
1258 head->r.cond_index++;
1259 tomoyo_set_space(head);
1260 switch (left) {
1261 case TOMOYO_ARGV_ENTRY:
1262 tomoyo_io_printf(head,
1263 "exec.argv[%lu]%s=\"",
1264 argv->index, argv->
1265 is_not ? "!" : "");
1266 tomoyo_set_string(head,
1267 argv->value->name);
1268 tomoyo_set_string(head, "\"");
1269 argv++;
1270 continue;
1271 case TOMOYO_ENVP_ENTRY:
1272 tomoyo_set_string(head,
1273 "exec.envp[\"");
1274 tomoyo_set_string(head,
1275 envp->name->name);
1276 tomoyo_io_printf(head, "\"]%s=", envp->
1277 is_not ? "!" : "");
1278 if (envp->value) {
1279 tomoyo_set_string(head, "\"");
1280 tomoyo_set_string(head, envp->
1281 value->name);
1282 tomoyo_set_string(head, "\"");
1283 } else {
1284 tomoyo_set_string(head,
1285 "NULL");
1286 }
1287 envp++;
1288 continue;
1289 case TOMOYO_NUMBER_UNION:
1290 tomoyo_print_number_union_nospace
1291 (head, numbers_p++);
1292 break;
1293 default:
1294 tomoyo_set_string(head,
1295 tomoyo_condition_keyword[left]);
1296 break;
1297 }
1298 tomoyo_set_string(head, match ? "=" : "!=");
1299 switch (right) {
1300 case TOMOYO_NAME_UNION:
1301 tomoyo_print_name_union_quoted
1302 (head, names_p++);
1303 break;
1304 case TOMOYO_NUMBER_UNION:
1305 tomoyo_print_number_union_nospace
1306 (head, numbers_p++);
1307 break;
1308 default:
1309 tomoyo_set_string(head,
1310 tomoyo_condition_keyword[right]);
1311 break;
1312 }
1313 }
1314 }
1315 head->r.cond_step++;
1316 /* fall through */
1317 case 2:
1318 if (!tomoyo_flush(head))
1319 break;
1320 head->r.cond_step++;
1321 /* fall through */
1322 case 3:
1323 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1324 tomoyo_io_printf(head, " grant_log=%s",
1325 tomoyo_yesno(cond->grant_log ==
1326 TOMOYO_GRANTLOG_YES));
1327 tomoyo_set_lf(head);
1328 return true;
1329 }
1330 return false;
1331 }
1332
1333 /**
1334 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1335 *
1336 * @head: Pointer to "struct tomoyo_io_buffer".
1337 * @category: Category name.
1338 *
1339 * Returns nothing.
1340 */
tomoyo_set_group(struct tomoyo_io_buffer * head,const char * category)1341 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1342 const char *category)
1343 {
1344 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1345 tomoyo_print_namespace(head);
1346 tomoyo_io_printf(head, "acl_group %u ",
1347 head->r.acl_group_index);
1348 }
1349 tomoyo_set_string(head, category);
1350 }
1351
1352 /**
1353 * tomoyo_print_entry - Print an ACL entry.
1354 *
1355 * @head: Pointer to "struct tomoyo_io_buffer".
1356 * @acl: Pointer to an ACL entry.
1357 *
1358 * Returns true on success, false otherwise.
1359 */
tomoyo_print_entry(struct tomoyo_io_buffer * head,struct tomoyo_acl_info * acl)1360 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1361 struct tomoyo_acl_info *acl)
1362 {
1363 const u8 acl_type = acl->type;
1364 bool first = true;
1365 u8 bit;
1366
1367 if (head->r.print_cond_part)
1368 goto print_cond_part;
1369 if (acl->is_deleted)
1370 return true;
1371 if (!tomoyo_flush(head))
1372 return false;
1373 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1374 struct tomoyo_path_acl *ptr =
1375 container_of(acl, typeof(*ptr), head);
1376 const u16 perm = ptr->perm;
1377 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1378 if (!(perm & (1 << bit)))
1379 continue;
1380 if (head->r.print_transition_related_only &&
1381 bit != TOMOYO_TYPE_EXECUTE)
1382 continue;
1383 if (first) {
1384 tomoyo_set_group(head, "file ");
1385 first = false;
1386 } else {
1387 tomoyo_set_slash(head);
1388 }
1389 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1390 }
1391 if (first)
1392 return true;
1393 tomoyo_print_name_union(head, &ptr->name);
1394 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1395 struct tomoyo_task_acl *ptr =
1396 container_of(acl, typeof(*ptr), head);
1397 tomoyo_set_group(head, "task ");
1398 tomoyo_set_string(head, "manual_domain_transition ");
1399 tomoyo_set_string(head, ptr->domainname->name);
1400 } else if (head->r.print_transition_related_only) {
1401 return true;
1402 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1403 struct tomoyo_path2_acl *ptr =
1404 container_of(acl, typeof(*ptr), head);
1405 const u8 perm = ptr->perm;
1406 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1407 if (!(perm & (1 << bit)))
1408 continue;
1409 if (first) {
1410 tomoyo_set_group(head, "file ");
1411 first = false;
1412 } else {
1413 tomoyo_set_slash(head);
1414 }
1415 tomoyo_set_string(head, tomoyo_mac_keywords
1416 [tomoyo_pp2mac[bit]]);
1417 }
1418 if (first)
1419 return true;
1420 tomoyo_print_name_union(head, &ptr->name1);
1421 tomoyo_print_name_union(head, &ptr->name2);
1422 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1423 struct tomoyo_path_number_acl *ptr =
1424 container_of(acl, typeof(*ptr), head);
1425 const u8 perm = ptr->perm;
1426 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1427 if (!(perm & (1 << bit)))
1428 continue;
1429 if (first) {
1430 tomoyo_set_group(head, "file ");
1431 first = false;
1432 } else {
1433 tomoyo_set_slash(head);
1434 }
1435 tomoyo_set_string(head, tomoyo_mac_keywords
1436 [tomoyo_pn2mac[bit]]);
1437 }
1438 if (first)
1439 return true;
1440 tomoyo_print_name_union(head, &ptr->name);
1441 tomoyo_print_number_union(head, &ptr->number);
1442 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1443 struct tomoyo_mkdev_acl *ptr =
1444 container_of(acl, typeof(*ptr), head);
1445 const u8 perm = ptr->perm;
1446 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1447 if (!(perm & (1 << bit)))
1448 continue;
1449 if (first) {
1450 tomoyo_set_group(head, "file ");
1451 first = false;
1452 } else {
1453 tomoyo_set_slash(head);
1454 }
1455 tomoyo_set_string(head, tomoyo_mac_keywords
1456 [tomoyo_pnnn2mac[bit]]);
1457 }
1458 if (first)
1459 return true;
1460 tomoyo_print_name_union(head, &ptr->name);
1461 tomoyo_print_number_union(head, &ptr->mode);
1462 tomoyo_print_number_union(head, &ptr->major);
1463 tomoyo_print_number_union(head, &ptr->minor);
1464 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1465 struct tomoyo_inet_acl *ptr =
1466 container_of(acl, typeof(*ptr), head);
1467 const u8 perm = ptr->perm;
1468
1469 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1470 if (!(perm & (1 << bit)))
1471 continue;
1472 if (first) {
1473 tomoyo_set_group(head, "network inet ");
1474 tomoyo_set_string(head, tomoyo_proto_keyword
1475 [ptr->protocol]);
1476 tomoyo_set_space(head);
1477 first = false;
1478 } else {
1479 tomoyo_set_slash(head);
1480 }
1481 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1482 }
1483 if (first)
1484 return true;
1485 tomoyo_set_space(head);
1486 if (ptr->address.group) {
1487 tomoyo_set_string(head, "@");
1488 tomoyo_set_string(head, ptr->address.group->group_name
1489 ->name);
1490 } else {
1491 char buf[128];
1492 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1493 tomoyo_io_printf(head, "%s", buf);
1494 }
1495 tomoyo_print_number_union(head, &ptr->port);
1496 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1497 struct tomoyo_unix_acl *ptr =
1498 container_of(acl, typeof(*ptr), head);
1499 const u8 perm = ptr->perm;
1500
1501 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1502 if (!(perm & (1 << bit)))
1503 continue;
1504 if (first) {
1505 tomoyo_set_group(head, "network unix ");
1506 tomoyo_set_string(head, tomoyo_proto_keyword
1507 [ptr->protocol]);
1508 tomoyo_set_space(head);
1509 first = false;
1510 } else {
1511 tomoyo_set_slash(head);
1512 }
1513 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1514 }
1515 if (first)
1516 return true;
1517 tomoyo_print_name_union(head, &ptr->name);
1518 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1519 struct tomoyo_mount_acl *ptr =
1520 container_of(acl, typeof(*ptr), head);
1521 tomoyo_set_group(head, "file mount");
1522 tomoyo_print_name_union(head, &ptr->dev_name);
1523 tomoyo_print_name_union(head, &ptr->dir_name);
1524 tomoyo_print_name_union(head, &ptr->fs_type);
1525 tomoyo_print_number_union(head, &ptr->flags);
1526 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1527 struct tomoyo_env_acl *ptr =
1528 container_of(acl, typeof(*ptr), head);
1529
1530 tomoyo_set_group(head, "misc env ");
1531 tomoyo_set_string(head, ptr->env->name);
1532 }
1533 if (acl->cond) {
1534 head->r.print_cond_part = true;
1535 head->r.cond_step = 0;
1536 if (!tomoyo_flush(head))
1537 return false;
1538 print_cond_part:
1539 if (!tomoyo_print_condition(head, acl->cond))
1540 return false;
1541 head->r.print_cond_part = false;
1542 } else {
1543 tomoyo_set_lf(head);
1544 }
1545 return true;
1546 }
1547
1548 /**
1549 * tomoyo_read_domain2 - Read domain policy.
1550 *
1551 * @head: Pointer to "struct tomoyo_io_buffer".
1552 * @list: Pointer to "struct list_head".
1553 *
1554 * Caller holds tomoyo_read_lock().
1555 *
1556 * Returns true on success, false otherwise.
1557 */
tomoyo_read_domain2(struct tomoyo_io_buffer * head,struct list_head * list)1558 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1559 struct list_head *list)
1560 {
1561 list_for_each_cookie(head->r.acl, list) {
1562 struct tomoyo_acl_info *ptr =
1563 list_entry(head->r.acl, typeof(*ptr), list);
1564 if (!tomoyo_print_entry(head, ptr))
1565 return false;
1566 }
1567 head->r.acl = NULL;
1568 return true;
1569 }
1570
1571 /**
1572 * tomoyo_read_domain - Read domain policy.
1573 *
1574 * @head: Pointer to "struct tomoyo_io_buffer".
1575 *
1576 * Caller holds tomoyo_read_lock().
1577 */
tomoyo_read_domain(struct tomoyo_io_buffer * head)1578 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1579 {
1580 if (head->r.eof)
1581 return;
1582 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1583 struct tomoyo_domain_info *domain =
1584 list_entry(head->r.domain, typeof(*domain), list);
1585 switch (head->r.step) {
1586 u8 i;
1587 case 0:
1588 if (domain->is_deleted &&
1589 !head->r.print_this_domain_only)
1590 continue;
1591 /* Print domainname and flags. */
1592 tomoyo_set_string(head, domain->domainname->name);
1593 tomoyo_set_lf(head);
1594 tomoyo_io_printf(head, "use_profile %u\n",
1595 domain->profile);
1596 tomoyo_io_printf(head, "use_group %u\n",
1597 domain->group);
1598 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1599 if (domain->flags[i])
1600 tomoyo_set_string(head, tomoyo_dif[i]);
1601 head->r.step++;
1602 tomoyo_set_lf(head);
1603 /* fall through */
1604 case 1:
1605 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1606 return;
1607 head->r.step++;
1608 if (!tomoyo_set_lf(head))
1609 return;
1610 /* fall through */
1611 case 2:
1612 head->r.step = 0;
1613 if (head->r.print_this_domain_only)
1614 goto done;
1615 }
1616 }
1617 done:
1618 head->r.eof = true;
1619 }
1620
1621 /**
1622 * tomoyo_write_pid: Specify PID to obtain domainname.
1623 *
1624 * @head: Pointer to "struct tomoyo_io_buffer".
1625 *
1626 * Returns 0.
1627 */
tomoyo_write_pid(struct tomoyo_io_buffer * head)1628 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1629 {
1630 head->r.eof = false;
1631 return 0;
1632 }
1633
1634 /**
1635 * tomoyo_read_pid - Get domainname of the specified PID.
1636 *
1637 * @head: Pointer to "struct tomoyo_io_buffer".
1638 *
1639 * Returns the domainname which the specified PID is in on success,
1640 * empty string otherwise.
1641 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1642 * using read()/write() interface rather than sysctl() interface.
1643 */
tomoyo_read_pid(struct tomoyo_io_buffer * head)1644 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1645 {
1646 char *buf = head->write_buf;
1647 bool global_pid = false;
1648 unsigned int pid;
1649 struct task_struct *p;
1650 struct tomoyo_domain_info *domain = NULL;
1651
1652 /* Accessing write_buf is safe because head->io_sem is held. */
1653 if (!buf) {
1654 head->r.eof = true;
1655 return; /* Do nothing if open(O_RDONLY). */
1656 }
1657 if (head->r.w_pos || head->r.eof)
1658 return;
1659 head->r.eof = true;
1660 if (tomoyo_str_starts(&buf, "global-pid "))
1661 global_pid = true;
1662 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1663 rcu_read_lock();
1664 if (global_pid)
1665 p = find_task_by_pid_ns(pid, &init_pid_ns);
1666 else
1667 p = find_task_by_vpid(pid);
1668 if (p)
1669 domain = tomoyo_real_domain(p);
1670 rcu_read_unlock();
1671 if (!domain)
1672 return;
1673 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1674 tomoyo_set_string(head, domain->domainname->name);
1675 }
1676
1677 /* String table for domain transition control keywords. */
1678 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1679 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1680 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1681 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1682 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1683 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1684 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1685 };
1686
1687 /* String table for grouping keywords. */
1688 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1689 [TOMOYO_PATH_GROUP] = "path_group ",
1690 [TOMOYO_NUMBER_GROUP] = "number_group ",
1691 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1692 };
1693
1694 /**
1695 * tomoyo_write_exception - Write exception policy.
1696 *
1697 * @head: Pointer to "struct tomoyo_io_buffer".
1698 *
1699 * Returns 0 on success, negative value otherwise.
1700 *
1701 * Caller holds tomoyo_read_lock().
1702 */
tomoyo_write_exception(struct tomoyo_io_buffer * head)1703 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1704 {
1705 const bool is_delete = head->w.is_delete;
1706 struct tomoyo_acl_param param = {
1707 .ns = head->w.ns,
1708 .is_delete = is_delete,
1709 .data = head->write_buf,
1710 };
1711 u8 i;
1712 if (tomoyo_str_starts(¶m.data, "aggregator "))
1713 return tomoyo_write_aggregator(¶m);
1714 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1715 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i]))
1716 return tomoyo_write_transition_control(¶m, i);
1717 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1718 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i]))
1719 return tomoyo_write_group(¶m, i);
1720 if (tomoyo_str_starts(¶m.data, "acl_group ")) {
1721 unsigned int group;
1722 char *data;
1723 group = simple_strtoul(param.data, &data, 10);
1724 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1725 return tomoyo_write_domain2
1726 (head->w.ns, &head->w.ns->acl_group[group],
1727 data, is_delete);
1728 }
1729 return -EINVAL;
1730 }
1731
1732 /**
1733 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1734 *
1735 * @head: Pointer to "struct tomoyo_io_buffer".
1736 * @idx: Index number.
1737 *
1738 * Returns true on success, false otherwise.
1739 *
1740 * Caller holds tomoyo_read_lock().
1741 */
tomoyo_read_group(struct tomoyo_io_buffer * head,const int idx)1742 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1743 {
1744 struct tomoyo_policy_namespace *ns =
1745 container_of(head->r.ns, typeof(*ns), namespace_list);
1746 struct list_head *list = &ns->group_list[idx];
1747 list_for_each_cookie(head->r.group, list) {
1748 struct tomoyo_group *group =
1749 list_entry(head->r.group, typeof(*group), head.list);
1750 list_for_each_cookie(head->r.acl, &group->member_list) {
1751 struct tomoyo_acl_head *ptr =
1752 list_entry(head->r.acl, typeof(*ptr), list);
1753 if (ptr->is_deleted)
1754 continue;
1755 if (!tomoyo_flush(head))
1756 return false;
1757 tomoyo_print_namespace(head);
1758 tomoyo_set_string(head, tomoyo_group_name[idx]);
1759 tomoyo_set_string(head, group->group_name->name);
1760 if (idx == TOMOYO_PATH_GROUP) {
1761 tomoyo_set_space(head);
1762 tomoyo_set_string(head, container_of
1763 (ptr, struct tomoyo_path_group,
1764 head)->member_name->name);
1765 } else if (idx == TOMOYO_NUMBER_GROUP) {
1766 tomoyo_print_number_union(head, &container_of
1767 (ptr,
1768 struct tomoyo_number_group,
1769 head)->number);
1770 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1771 char buffer[128];
1772
1773 struct tomoyo_address_group *member =
1774 container_of(ptr, typeof(*member),
1775 head);
1776 tomoyo_print_ip(buffer, sizeof(buffer),
1777 &member->address);
1778 tomoyo_io_printf(head, " %s", buffer);
1779 }
1780 tomoyo_set_lf(head);
1781 }
1782 head->r.acl = NULL;
1783 }
1784 head->r.group = NULL;
1785 return true;
1786 }
1787
1788 /**
1789 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1790 *
1791 * @head: Pointer to "struct tomoyo_io_buffer".
1792 * @idx: Index number.
1793 *
1794 * Returns true on success, false otherwise.
1795 *
1796 * Caller holds tomoyo_read_lock().
1797 */
tomoyo_read_policy(struct tomoyo_io_buffer * head,const int idx)1798 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1799 {
1800 struct tomoyo_policy_namespace *ns =
1801 container_of(head->r.ns, typeof(*ns), namespace_list);
1802 struct list_head *list = &ns->policy_list[idx];
1803 list_for_each_cookie(head->r.acl, list) {
1804 struct tomoyo_acl_head *acl =
1805 container_of(head->r.acl, typeof(*acl), list);
1806 if (acl->is_deleted)
1807 continue;
1808 if (!tomoyo_flush(head))
1809 return false;
1810 switch (idx) {
1811 case TOMOYO_ID_TRANSITION_CONTROL:
1812 {
1813 struct tomoyo_transition_control *ptr =
1814 container_of(acl, typeof(*ptr), head);
1815 tomoyo_print_namespace(head);
1816 tomoyo_set_string(head, tomoyo_transition_type
1817 [ptr->type]);
1818 tomoyo_set_string(head, ptr->program ?
1819 ptr->program->name : "any");
1820 tomoyo_set_string(head, " from ");
1821 tomoyo_set_string(head, ptr->domainname ?
1822 ptr->domainname->name :
1823 "any");
1824 }
1825 break;
1826 case TOMOYO_ID_AGGREGATOR:
1827 {
1828 struct tomoyo_aggregator *ptr =
1829 container_of(acl, typeof(*ptr), head);
1830 tomoyo_print_namespace(head);
1831 tomoyo_set_string(head, "aggregator ");
1832 tomoyo_set_string(head,
1833 ptr->original_name->name);
1834 tomoyo_set_space(head);
1835 tomoyo_set_string(head,
1836 ptr->aggregated_name->name);
1837 }
1838 break;
1839 default:
1840 continue;
1841 }
1842 tomoyo_set_lf(head);
1843 }
1844 head->r.acl = NULL;
1845 return true;
1846 }
1847
1848 /**
1849 * tomoyo_read_exception - Read exception policy.
1850 *
1851 * @head: Pointer to "struct tomoyo_io_buffer".
1852 *
1853 * Caller holds tomoyo_read_lock().
1854 */
tomoyo_read_exception(struct tomoyo_io_buffer * head)1855 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1856 {
1857 struct tomoyo_policy_namespace *ns =
1858 container_of(head->r.ns, typeof(*ns), namespace_list);
1859 if (head->r.eof)
1860 return;
1861 while (head->r.step < TOMOYO_MAX_POLICY &&
1862 tomoyo_read_policy(head, head->r.step))
1863 head->r.step++;
1864 if (head->r.step < TOMOYO_MAX_POLICY)
1865 return;
1866 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1867 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1868 head->r.step++;
1869 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1870 return;
1871 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1872 + TOMOYO_MAX_ACL_GROUPS) {
1873 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1874 - TOMOYO_MAX_GROUP;
1875 if (!tomoyo_read_domain2(head, &ns->acl_group
1876 [head->r.acl_group_index]))
1877 return;
1878 head->r.step++;
1879 }
1880 head->r.eof = true;
1881 }
1882
1883 /* Wait queue for kernel -> userspace notification. */
1884 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1885 /* Wait queue for userspace -> kernel notification. */
1886 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1887
1888 /* Structure for query. */
1889 struct tomoyo_query {
1890 struct list_head list;
1891 struct tomoyo_domain_info *domain;
1892 char *query;
1893 size_t query_len;
1894 unsigned int serial;
1895 u8 timer;
1896 u8 answer;
1897 u8 retry;
1898 };
1899
1900 /* The list for "struct tomoyo_query". */
1901 static LIST_HEAD(tomoyo_query_list);
1902
1903 /* Lock for manipulating tomoyo_query_list. */
1904 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1905
1906 /*
1907 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1908 * interface.
1909 */
1910 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1911
1912 /**
1913 * tomoyo_truncate - Truncate a line.
1914 *
1915 * @str: String to truncate.
1916 *
1917 * Returns length of truncated @str.
1918 */
tomoyo_truncate(char * str)1919 static int tomoyo_truncate(char *str)
1920 {
1921 char *start = str;
1922 while (*(unsigned char *) str > (unsigned char) ' ')
1923 str++;
1924 *str = '\0';
1925 return strlen(start) + 1;
1926 }
1927
1928 /**
1929 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1930 *
1931 * @domain: Pointer to "struct tomoyo_domain_info".
1932 * @header: Lines containing ACL.
1933 *
1934 * Returns nothing.
1935 */
tomoyo_add_entry(struct tomoyo_domain_info * domain,char * header)1936 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1937 {
1938 char *buffer;
1939 char *realpath = NULL;
1940 char *argv0 = NULL;
1941 char *symlink = NULL;
1942 char *cp = strchr(header, '\n');
1943 int len;
1944 if (!cp)
1945 return;
1946 cp = strchr(cp + 1, '\n');
1947 if (!cp)
1948 return;
1949 *cp++ = '\0';
1950 len = strlen(cp) + 1;
1951 /* strstr() will return NULL if ordering is wrong. */
1952 if (*cp == 'f') {
1953 argv0 = strstr(header, " argv[]={ \"");
1954 if (argv0) {
1955 argv0 += 10;
1956 len += tomoyo_truncate(argv0) + 14;
1957 }
1958 realpath = strstr(header, " exec={ realpath=\"");
1959 if (realpath) {
1960 realpath += 8;
1961 len += tomoyo_truncate(realpath) + 6;
1962 }
1963 symlink = strstr(header, " symlink.target=\"");
1964 if (symlink)
1965 len += tomoyo_truncate(symlink + 1) + 1;
1966 }
1967 buffer = kmalloc(len, GFP_NOFS);
1968 if (!buffer)
1969 return;
1970 snprintf(buffer, len - 1, "%s", cp);
1971 if (realpath)
1972 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1973 if (argv0)
1974 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1975 if (symlink)
1976 tomoyo_addprintf(buffer, len, "%s", symlink);
1977 tomoyo_normalize_line(buffer);
1978 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1979 false))
1980 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1981 kfree(buffer);
1982 }
1983
1984 /**
1985 * tomoyo_supervisor - Ask for the supervisor's decision.
1986 *
1987 * @r: Pointer to "struct tomoyo_request_info".
1988 * @fmt: The printf()'s format string, followed by parameters.
1989 *
1990 * Returns 0 if the supervisor decided to permit the access request which
1991 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1992 * supervisor decided to retry the access request which violated the policy in
1993 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1994 */
tomoyo_supervisor(struct tomoyo_request_info * r,const char * fmt,...)1995 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1996 {
1997 va_list args;
1998 int error;
1999 int len;
2000 static unsigned int tomoyo_serial;
2001 struct tomoyo_query entry = { };
2002 bool quota_exceeded = false;
2003 va_start(args, fmt);
2004 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2005 va_end(args);
2006 /* Write /sys/kernel/security/tomoyo/audit. */
2007 va_start(args, fmt);
2008 tomoyo_write_log2(r, len, fmt, args);
2009 va_end(args);
2010 /* Nothing more to do if granted. */
2011 if (r->granted)
2012 return 0;
2013 if (r->mode)
2014 tomoyo_update_stat(r->mode);
2015 switch (r->mode) {
2016 case TOMOYO_CONFIG_ENFORCING:
2017 error = -EPERM;
2018 if (atomic_read(&tomoyo_query_observers))
2019 break;
2020 goto out;
2021 case TOMOYO_CONFIG_LEARNING:
2022 error = 0;
2023 /* Check max_learning_entry parameter. */
2024 if (tomoyo_domain_quota_is_ok(r))
2025 break;
2026 /* fall through */
2027 default:
2028 return 0;
2029 }
2030 /* Get message. */
2031 va_start(args, fmt);
2032 entry.query = tomoyo_init_log(r, len, fmt, args);
2033 va_end(args);
2034 if (!entry.query)
2035 goto out;
2036 entry.query_len = strlen(entry.query) + 1;
2037 if (!error) {
2038 tomoyo_add_entry(r->domain, entry.query);
2039 goto out;
2040 }
2041 len = tomoyo_round2(entry.query_len);
2042 entry.domain = r->domain;
2043 spin_lock(&tomoyo_query_list_lock);
2044 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2045 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2046 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2047 quota_exceeded = true;
2048 } else {
2049 entry.serial = tomoyo_serial++;
2050 entry.retry = r->retry;
2051 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2052 list_add_tail(&entry.list, &tomoyo_query_list);
2053 }
2054 spin_unlock(&tomoyo_query_list_lock);
2055 if (quota_exceeded)
2056 goto out;
2057 /* Give 10 seconds for supervisor's opinion. */
2058 while (entry.timer < 10) {
2059 wake_up_all(&tomoyo_query_wait);
2060 if (wait_event_interruptible_timeout
2061 (tomoyo_answer_wait, entry.answer ||
2062 !atomic_read(&tomoyo_query_observers), HZ))
2063 break;
2064 else
2065 entry.timer++;
2066 }
2067 spin_lock(&tomoyo_query_list_lock);
2068 list_del(&entry.list);
2069 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2070 spin_unlock(&tomoyo_query_list_lock);
2071 switch (entry.answer) {
2072 case 3: /* Asked to retry by administrator. */
2073 error = TOMOYO_RETRY_REQUEST;
2074 r->retry++;
2075 break;
2076 case 1:
2077 /* Granted by administrator. */
2078 error = 0;
2079 break;
2080 default:
2081 /* Timed out or rejected by administrator. */
2082 break;
2083 }
2084 out:
2085 kfree(entry.query);
2086 return error;
2087 }
2088
2089 /**
2090 * tomoyo_find_domain_by_qid - Get domain by query id.
2091 *
2092 * @serial: Query ID assigned by tomoyo_supervisor().
2093 *
2094 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2095 */
tomoyo_find_domain_by_qid(unsigned int serial)2096 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2097 (unsigned int serial)
2098 {
2099 struct tomoyo_query *ptr;
2100 struct tomoyo_domain_info *domain = NULL;
2101 spin_lock(&tomoyo_query_list_lock);
2102 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2103 if (ptr->serial != serial)
2104 continue;
2105 domain = ptr->domain;
2106 break;
2107 }
2108 spin_unlock(&tomoyo_query_list_lock);
2109 return domain;
2110 }
2111
2112 /**
2113 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2114 *
2115 * @file: Pointer to "struct file".
2116 * @wait: Pointer to "poll_table".
2117 *
2118 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2119 *
2120 * Waits for access requests which violated policy in enforcing mode.
2121 */
tomoyo_poll_query(struct file * file,poll_table * wait)2122 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2123 {
2124 if (!list_empty(&tomoyo_query_list))
2125 return POLLIN | POLLRDNORM;
2126 poll_wait(file, &tomoyo_query_wait, wait);
2127 if (!list_empty(&tomoyo_query_list))
2128 return POLLIN | POLLRDNORM;
2129 return 0;
2130 }
2131
2132 /**
2133 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2134 *
2135 * @head: Pointer to "struct tomoyo_io_buffer".
2136 */
tomoyo_read_query(struct tomoyo_io_buffer * head)2137 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2138 {
2139 struct list_head *tmp;
2140 unsigned int pos = 0;
2141 size_t len = 0;
2142 char *buf;
2143 if (head->r.w_pos)
2144 return;
2145 if (head->read_buf) {
2146 kfree(head->read_buf);
2147 head->read_buf = NULL;
2148 }
2149 spin_lock(&tomoyo_query_list_lock);
2150 list_for_each(tmp, &tomoyo_query_list) {
2151 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2152 if (pos++ != head->r.query_index)
2153 continue;
2154 len = ptr->query_len;
2155 break;
2156 }
2157 spin_unlock(&tomoyo_query_list_lock);
2158 if (!len) {
2159 head->r.query_index = 0;
2160 return;
2161 }
2162 buf = kzalloc(len + 32, GFP_NOFS);
2163 if (!buf)
2164 return;
2165 pos = 0;
2166 spin_lock(&tomoyo_query_list_lock);
2167 list_for_each(tmp, &tomoyo_query_list) {
2168 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2169 if (pos++ != head->r.query_index)
2170 continue;
2171 /*
2172 * Some query can be skipped because tomoyo_query_list
2173 * can change, but I don't care.
2174 */
2175 if (len == ptr->query_len)
2176 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2177 ptr->retry, ptr->query);
2178 break;
2179 }
2180 spin_unlock(&tomoyo_query_list_lock);
2181 if (buf[0]) {
2182 head->read_buf = buf;
2183 head->r.w[head->r.w_pos++] = buf;
2184 head->r.query_index++;
2185 } else {
2186 kfree(buf);
2187 }
2188 }
2189
2190 /**
2191 * tomoyo_write_answer - Write the supervisor's decision.
2192 *
2193 * @head: Pointer to "struct tomoyo_io_buffer".
2194 *
2195 * Returns 0 on success, -EINVAL otherwise.
2196 */
tomoyo_write_answer(struct tomoyo_io_buffer * head)2197 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2198 {
2199 char *data = head->write_buf;
2200 struct list_head *tmp;
2201 unsigned int serial;
2202 unsigned int answer;
2203 spin_lock(&tomoyo_query_list_lock);
2204 list_for_each(tmp, &tomoyo_query_list) {
2205 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2206 ptr->timer = 0;
2207 }
2208 spin_unlock(&tomoyo_query_list_lock);
2209 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2210 return -EINVAL;
2211 spin_lock(&tomoyo_query_list_lock);
2212 list_for_each(tmp, &tomoyo_query_list) {
2213 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2214 if (ptr->serial != serial)
2215 continue;
2216 ptr->answer = answer;
2217 /* Remove from tomoyo_query_list. */
2218 if (ptr->answer)
2219 list_del_init(&ptr->list);
2220 break;
2221 }
2222 spin_unlock(&tomoyo_query_list_lock);
2223 return 0;
2224 }
2225
2226 /**
2227 * tomoyo_read_version: Get version.
2228 *
2229 * @head: Pointer to "struct tomoyo_io_buffer".
2230 *
2231 * Returns version information.
2232 */
tomoyo_read_version(struct tomoyo_io_buffer * head)2233 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2234 {
2235 if (!head->r.eof) {
2236 tomoyo_io_printf(head, "2.5.0");
2237 head->r.eof = true;
2238 }
2239 }
2240
2241 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2242 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2243 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2244 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2245 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2246 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2247 };
2248
2249 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2250 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2251 [TOMOYO_MEMORY_POLICY] = "policy:",
2252 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2253 [TOMOYO_MEMORY_QUERY] = "query message:",
2254 };
2255
2256 /* Timestamp counter for last updated. */
2257 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2258 /* Counter for number of updates. */
2259 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2260
2261 /**
2262 * tomoyo_update_stat - Update statistic counters.
2263 *
2264 * @index: Index for policy type.
2265 *
2266 * Returns nothing.
2267 */
tomoyo_update_stat(const u8 index)2268 void tomoyo_update_stat(const u8 index)
2269 {
2270 struct timeval tv;
2271 do_gettimeofday(&tv);
2272 /*
2273 * I don't use atomic operations because race condition is not fatal.
2274 */
2275 tomoyo_stat_updated[index]++;
2276 tomoyo_stat_modified[index] = tv.tv_sec;
2277 }
2278
2279 /**
2280 * tomoyo_read_stat - Read statistic data.
2281 *
2282 * @head: Pointer to "struct tomoyo_io_buffer".
2283 *
2284 * Returns nothing.
2285 */
tomoyo_read_stat(struct tomoyo_io_buffer * head)2286 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2287 {
2288 u8 i;
2289 unsigned int total = 0;
2290 if (head->r.eof)
2291 return;
2292 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2293 tomoyo_io_printf(head, "Policy %-30s %10u",
2294 tomoyo_policy_headers[i],
2295 tomoyo_stat_updated[i]);
2296 if (tomoyo_stat_modified[i]) {
2297 struct tomoyo_time stamp;
2298 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2299 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2300 "%02u:%02u:%02u)",
2301 stamp.year, stamp.month, stamp.day,
2302 stamp.hour, stamp.min, stamp.sec);
2303 }
2304 tomoyo_set_lf(head);
2305 }
2306 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2307 unsigned int used = tomoyo_memory_used[i];
2308 total += used;
2309 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2310 tomoyo_memory_headers[i], used);
2311 used = tomoyo_memory_quota[i];
2312 if (used)
2313 tomoyo_io_printf(head, " (Quota: %10u)", used);
2314 tomoyo_set_lf(head);
2315 }
2316 tomoyo_io_printf(head, "Total memory used: %10u\n",
2317 total);
2318 head->r.eof = true;
2319 }
2320
2321 /**
2322 * tomoyo_write_stat - Set memory quota.
2323 *
2324 * @head: Pointer to "struct tomoyo_io_buffer".
2325 *
2326 * Returns 0.
2327 */
tomoyo_write_stat(struct tomoyo_io_buffer * head)2328 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2329 {
2330 char *data = head->write_buf;
2331 u8 i;
2332 if (tomoyo_str_starts(&data, "Memory used by "))
2333 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2334 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2335 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2336 return 0;
2337 }
2338
2339 /**
2340 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2341 *
2342 * @type: Type of interface.
2343 * @file: Pointer to "struct file".
2344 *
2345 * Returns 0 on success, negative value otherwise.
2346 */
tomoyo_open_control(const u8 type,struct file * file)2347 int tomoyo_open_control(const u8 type, struct file *file)
2348 {
2349 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2350
2351 if (!head)
2352 return -ENOMEM;
2353 mutex_init(&head->io_sem);
2354 head->type = type;
2355 switch (type) {
2356 case TOMOYO_DOMAINPOLICY:
2357 /* /sys/kernel/security/tomoyo/domain_policy */
2358 head->write = tomoyo_write_domain;
2359 head->read = tomoyo_read_domain;
2360 break;
2361 case TOMOYO_EXCEPTIONPOLICY:
2362 /* /sys/kernel/security/tomoyo/exception_policy */
2363 head->write = tomoyo_write_exception;
2364 head->read = tomoyo_read_exception;
2365 break;
2366 case TOMOYO_AUDIT:
2367 /* /sys/kernel/security/tomoyo/audit */
2368 head->poll = tomoyo_poll_log;
2369 head->read = tomoyo_read_log;
2370 break;
2371 case TOMOYO_PROCESS_STATUS:
2372 /* /sys/kernel/security/tomoyo/.process_status */
2373 head->write = tomoyo_write_pid;
2374 head->read = tomoyo_read_pid;
2375 break;
2376 case TOMOYO_VERSION:
2377 /* /sys/kernel/security/tomoyo/version */
2378 head->read = tomoyo_read_version;
2379 head->readbuf_size = 128;
2380 break;
2381 case TOMOYO_STAT:
2382 /* /sys/kernel/security/tomoyo/stat */
2383 head->write = tomoyo_write_stat;
2384 head->read = tomoyo_read_stat;
2385 head->readbuf_size = 1024;
2386 break;
2387 case TOMOYO_PROFILE:
2388 /* /sys/kernel/security/tomoyo/profile */
2389 head->write = tomoyo_write_profile;
2390 head->read = tomoyo_read_profile;
2391 break;
2392 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2393 head->poll = tomoyo_poll_query;
2394 head->write = tomoyo_write_answer;
2395 head->read = tomoyo_read_query;
2396 break;
2397 case TOMOYO_MANAGER:
2398 /* /sys/kernel/security/tomoyo/manager */
2399 head->write = tomoyo_write_manager;
2400 head->read = tomoyo_read_manager;
2401 break;
2402 }
2403 if (!(file->f_mode & FMODE_READ)) {
2404 /*
2405 * No need to allocate read_buf since it is not opened
2406 * for reading.
2407 */
2408 head->read = NULL;
2409 head->poll = NULL;
2410 } else if (!head->poll) {
2411 /* Don't allocate read_buf for poll() access. */
2412 if (!head->readbuf_size)
2413 head->readbuf_size = 4096 * 2;
2414 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2415 if (!head->read_buf) {
2416 kfree(head);
2417 return -ENOMEM;
2418 }
2419 }
2420 if (!(file->f_mode & FMODE_WRITE)) {
2421 /*
2422 * No need to allocate write_buf since it is not opened
2423 * for writing.
2424 */
2425 head->write = NULL;
2426 } else if (head->write) {
2427 head->writebuf_size = 4096 * 2;
2428 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2429 if (!head->write_buf) {
2430 kfree(head->read_buf);
2431 kfree(head);
2432 return -ENOMEM;
2433 }
2434 }
2435 /*
2436 * If the file is /sys/kernel/security/tomoyo/query , increment the
2437 * observer counter.
2438 * The obserber counter is used by tomoyo_supervisor() to see if
2439 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2440 */
2441 if (type == TOMOYO_QUERY)
2442 atomic_inc(&tomoyo_query_observers);
2443 file->private_data = head;
2444 tomoyo_notify_gc(head, true);
2445 return 0;
2446 }
2447
2448 /**
2449 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2450 *
2451 * @file: Pointer to "struct file".
2452 * @wait: Pointer to "poll_table". Maybe NULL.
2453 *
2454 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2455 * POLLOUT | POLLWRNORM otherwise.
2456 */
tomoyo_poll_control(struct file * file,poll_table * wait)2457 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2458 {
2459 struct tomoyo_io_buffer *head = file->private_data;
2460 if (head->poll)
2461 return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2462 return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2463 }
2464
2465 /**
2466 * tomoyo_set_namespace_cursor - Set namespace to read.
2467 *
2468 * @head: Pointer to "struct tomoyo_io_buffer".
2469 *
2470 * Returns nothing.
2471 */
tomoyo_set_namespace_cursor(struct tomoyo_io_buffer * head)2472 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2473 {
2474 struct list_head *ns;
2475 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2476 head->type != TOMOYO_PROFILE)
2477 return;
2478 /*
2479 * If this is the first read, or reading previous namespace finished
2480 * and has more namespaces to read, update the namespace cursor.
2481 */
2482 ns = head->r.ns;
2483 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2484 /* Clearing is OK because tomoyo_flush() returned true. */
2485 memset(&head->r, 0, sizeof(head->r));
2486 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2487 }
2488 }
2489
2490 /**
2491 * tomoyo_has_more_namespace - Check for unread namespaces.
2492 *
2493 * @head: Pointer to "struct tomoyo_io_buffer".
2494 *
2495 * Returns true if we have more entries to print, false otherwise.
2496 */
tomoyo_has_more_namespace(struct tomoyo_io_buffer * head)2497 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2498 {
2499 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2500 head->type == TOMOYO_PROFILE) && head->r.eof &&
2501 head->r.ns->next != &tomoyo_namespace_list;
2502 }
2503
2504 /**
2505 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2506 *
2507 * @head: Pointer to "struct tomoyo_io_buffer".
2508 * @buffer: Poiner to buffer to write to.
2509 * @buffer_len: Size of @buffer.
2510 *
2511 * Returns bytes read on success, negative value otherwise.
2512 */
tomoyo_read_control(struct tomoyo_io_buffer * head,char __user * buffer,const int buffer_len)2513 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2514 const int buffer_len)
2515 {
2516 int len;
2517 int idx;
2518
2519 if (!head->read)
2520 return -ENOSYS;
2521 if (mutex_lock_interruptible(&head->io_sem))
2522 return -EINTR;
2523 head->read_user_buf = buffer;
2524 head->read_user_buf_avail = buffer_len;
2525 idx = tomoyo_read_lock();
2526 if (tomoyo_flush(head))
2527 /* Call the policy handler. */
2528 do {
2529 tomoyo_set_namespace_cursor(head);
2530 head->read(head);
2531 } while (tomoyo_flush(head) &&
2532 tomoyo_has_more_namespace(head));
2533 tomoyo_read_unlock(idx);
2534 len = head->read_user_buf - buffer;
2535 mutex_unlock(&head->io_sem);
2536 return len;
2537 }
2538
2539 /**
2540 * tomoyo_parse_policy - Parse a policy line.
2541 *
2542 * @head: Poiter to "struct tomoyo_io_buffer".
2543 * @line: Line to parse.
2544 *
2545 * Returns 0 on success, negative value otherwise.
2546 *
2547 * Caller holds tomoyo_read_lock().
2548 */
tomoyo_parse_policy(struct tomoyo_io_buffer * head,char * line)2549 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2550 {
2551 /* Delete request? */
2552 head->w.is_delete = !strncmp(line, "delete ", 7);
2553 if (head->w.is_delete)
2554 memmove(line, line + 7, strlen(line + 7) + 1);
2555 /* Selecting namespace to update. */
2556 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2557 head->type == TOMOYO_PROFILE) {
2558 if (*line == '<') {
2559 char *cp = strchr(line, ' ');
2560 if (cp) {
2561 *cp++ = '\0';
2562 head->w.ns = tomoyo_assign_namespace(line);
2563 memmove(line, cp, strlen(cp) + 1);
2564 } else
2565 head->w.ns = NULL;
2566 } else
2567 head->w.ns = &tomoyo_kernel_namespace;
2568 /* Don't allow updating if namespace is invalid. */
2569 if (!head->w.ns)
2570 return -ENOENT;
2571 }
2572 /* Do the update. */
2573 return head->write(head);
2574 }
2575
2576 /**
2577 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2578 *
2579 * @head: Pointer to "struct tomoyo_io_buffer".
2580 * @buffer: Pointer to buffer to read from.
2581 * @buffer_len: Size of @buffer.
2582 *
2583 * Returns @buffer_len on success, negative value otherwise.
2584 */
tomoyo_write_control(struct tomoyo_io_buffer * head,const char __user * buffer,const int buffer_len)2585 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2586 const char __user *buffer, const int buffer_len)
2587 {
2588 int error = buffer_len;
2589 size_t avail_len = buffer_len;
2590 char *cp0 = head->write_buf;
2591 int idx;
2592 if (!head->write)
2593 return -ENOSYS;
2594 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2595 return -EFAULT;
2596 if (mutex_lock_interruptible(&head->io_sem))
2597 return -EINTR;
2598 head->read_user_buf_avail = 0;
2599 idx = tomoyo_read_lock();
2600 /* Read a line and dispatch it to the policy handler. */
2601 while (avail_len > 0) {
2602 char c;
2603 if (head->w.avail >= head->writebuf_size - 1) {
2604 const int len = head->writebuf_size * 2;
2605 char *cp = kzalloc(len, GFP_NOFS);
2606 if (!cp) {
2607 error = -ENOMEM;
2608 break;
2609 }
2610 memmove(cp, cp0, head->w.avail);
2611 kfree(cp0);
2612 head->write_buf = cp;
2613 cp0 = cp;
2614 head->writebuf_size = len;
2615 }
2616 if (get_user(c, buffer)) {
2617 error = -EFAULT;
2618 break;
2619 }
2620 buffer++;
2621 avail_len--;
2622 cp0[head->w.avail++] = c;
2623 if (c != '\n')
2624 continue;
2625 cp0[head->w.avail - 1] = '\0';
2626 head->w.avail = 0;
2627 tomoyo_normalize_line(cp0);
2628 if (!strcmp(cp0, "reset")) {
2629 head->w.ns = &tomoyo_kernel_namespace;
2630 head->w.domain = NULL;
2631 memset(&head->r, 0, sizeof(head->r));
2632 continue;
2633 }
2634 /* Don't allow updating policies by non manager programs. */
2635 switch (head->type) {
2636 case TOMOYO_PROCESS_STATUS:
2637 /* This does not write anything. */
2638 break;
2639 case TOMOYO_DOMAINPOLICY:
2640 if (tomoyo_select_domain(head, cp0))
2641 continue;
2642 /* fall through */
2643 case TOMOYO_EXCEPTIONPOLICY:
2644 if (!strcmp(cp0, "select transition_only")) {
2645 head->r.print_transition_related_only = true;
2646 continue;
2647 }
2648 /* fall through */
2649 default:
2650 if (!tomoyo_manager()) {
2651 error = -EPERM;
2652 goto out;
2653 }
2654 }
2655 switch (tomoyo_parse_policy(head, cp0)) {
2656 case -EPERM:
2657 error = -EPERM;
2658 goto out;
2659 case 0:
2660 switch (head->type) {
2661 case TOMOYO_DOMAINPOLICY:
2662 case TOMOYO_EXCEPTIONPOLICY:
2663 case TOMOYO_STAT:
2664 case TOMOYO_PROFILE:
2665 case TOMOYO_MANAGER:
2666 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2667 break;
2668 default:
2669 break;
2670 }
2671 break;
2672 }
2673 }
2674 out:
2675 tomoyo_read_unlock(idx);
2676 mutex_unlock(&head->io_sem);
2677 return error;
2678 }
2679
2680 /**
2681 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2682 *
2683 * @head: Pointer to "struct tomoyo_io_buffer".
2684 */
tomoyo_close_control(struct tomoyo_io_buffer * head)2685 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2686 {
2687 /*
2688 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2689 * observer counter.
2690 */
2691 if (head->type == TOMOYO_QUERY &&
2692 atomic_dec_and_test(&tomoyo_query_observers))
2693 wake_up_all(&tomoyo_answer_wait);
2694 tomoyo_notify_gc(head, false);
2695 }
2696
2697 /**
2698 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2699 */
tomoyo_check_profile(void)2700 void tomoyo_check_profile(void)
2701 {
2702 struct tomoyo_domain_info *domain;
2703 const int idx = tomoyo_read_lock();
2704 tomoyo_policy_loaded = true;
2705 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2706 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2707 const u8 profile = domain->profile;
2708 const struct tomoyo_policy_namespace *ns = domain->ns;
2709 if (ns->profile_version != 20110903)
2710 printk(KERN_ERR
2711 "Profile version %u is not supported.\n",
2712 ns->profile_version);
2713 else if (!ns->profile_ptr[profile])
2714 printk(KERN_ERR
2715 "Profile %u (used by '%s') is not defined.\n",
2716 profile, domain->domainname->name);
2717 else
2718 continue;
2719 printk(KERN_ERR
2720 "Userland tools for TOMOYO 2.5 must be installed and "
2721 "policy must be initialized.\n");
2722 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2723 "for more information.\n");
2724 panic("STOP!");
2725 }
2726 tomoyo_read_unlock(idx);
2727 printk(KERN_INFO "Mandatory Access Control activated.\n");
2728 }
2729
2730 /**
2731 * tomoyo_load_builtin_policy - Load built-in policy.
2732 *
2733 * Returns nothing.
2734 */
tomoyo_load_builtin_policy(void)2735 void __init tomoyo_load_builtin_policy(void)
2736 {
2737 /*
2738 * This include file is manually created and contains built-in policy
2739 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2740 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2741 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2742 */
2743 #include "builtin-policy.h"
2744 u8 i;
2745 const int idx = tomoyo_read_lock();
2746 for (i = 0; i < 5; i++) {
2747 struct tomoyo_io_buffer head = { };
2748 char *start = "";
2749 switch (i) {
2750 case 0:
2751 start = tomoyo_builtin_profile;
2752 head.type = TOMOYO_PROFILE;
2753 head.write = tomoyo_write_profile;
2754 break;
2755 case 1:
2756 start = tomoyo_builtin_exception_policy;
2757 head.type = TOMOYO_EXCEPTIONPOLICY;
2758 head.write = tomoyo_write_exception;
2759 break;
2760 case 2:
2761 start = tomoyo_builtin_domain_policy;
2762 head.type = TOMOYO_DOMAINPOLICY;
2763 head.write = tomoyo_write_domain;
2764 break;
2765 case 3:
2766 start = tomoyo_builtin_manager;
2767 head.type = TOMOYO_MANAGER;
2768 head.write = tomoyo_write_manager;
2769 break;
2770 case 4:
2771 start = tomoyo_builtin_stat;
2772 head.type = TOMOYO_STAT;
2773 head.write = tomoyo_write_stat;
2774 break;
2775 }
2776 while (1) {
2777 char *end = strchr(start, '\n');
2778 if (!end)
2779 break;
2780 *end = '\0';
2781 tomoyo_normalize_line(start);
2782 head.write_buf = start;
2783 tomoyo_parse_policy(&head, start);
2784 start = end + 1;
2785 }
2786 }
2787 tomoyo_read_unlock(idx);
2788 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2789 tomoyo_check_profile();
2790 #endif
2791 }
2792