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Merge branch 'fixes-for-arm-soc-20120416' of git://git.kernel.org/pub/scm/linux/kerne...
[linux-2.6.git] / security / tomoyo / common.c
blob8656b16eef7b9ce5e4749815130791af1badc524
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
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_domain_def(manager)) {
854 if (!tomoyo_correct_domain(manager))
855 return -EINVAL;
856 e.is_domain = true;
857 } else {
858 if (!tomoyo_correct_path(manager))
859 return -EINVAL;
860 }
861 e.manager = tomoyo_get_name(manager);
862 if (e.manager) {
863 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
864 tomoyo_same_manager);
865 tomoyo_put_name(e.manager);
866 }
867 return error;
868 }
869
870 /**
871 * tomoyo_write_manager - Write manager policy.
872 *
873 * @head: Pointer to "struct tomoyo_io_buffer".
874 *
875 * Returns 0 on success, negative value otherwise.
876 *
877 * Caller holds tomoyo_read_lock().
878 */
879 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
880 {
881 char *data = head->write_buf;
882
883 if (!strcmp(data, "manage_by_non_root")) {
884 tomoyo_manage_by_non_root = !head->w.is_delete;
885 return 0;
886 }
887 return tomoyo_update_manager_entry(data, head->w.is_delete);
888 }
889
890 /**
891 * tomoyo_read_manager - Read manager policy.
892 *
893 * @head: Pointer to "struct tomoyo_io_buffer".
894 *
895 * Caller holds tomoyo_read_lock().
896 */
897 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
898 {
899 if (head->r.eof)
900 return;
901 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
902 policy_list[TOMOYO_ID_MANAGER]) {
903 struct tomoyo_manager *ptr =
904 list_entry(head->r.acl, typeof(*ptr), head.list);
905 if (ptr->head.is_deleted)
906 continue;
907 if (!tomoyo_flush(head))
908 return;
909 tomoyo_set_string(head, ptr->manager->name);
910 tomoyo_set_lf(head);
911 }
912 head->r.eof = true;
913 }
914
915 /**
916 * tomoyo_manager - Check whether the current process is a policy manager.
917 *
918 * Returns true if the current process is permitted to modify policy
919 * via /sys/kernel/security/tomoyo/ interface.
920 *
921 * Caller holds tomoyo_read_lock().
922 */
923 static bool tomoyo_manager(void)
924 {
925 struct tomoyo_manager *ptr;
926 const char *exe;
927 const struct task_struct *task = current;
928 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
929 bool found = false;
930
931 if (!tomoyo_policy_loaded)
932 return true;
933 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
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 && ptr->is_domain
938 && !tomoyo_pathcmp(domainname, ptr->manager)) {
939 found = true;
940 break;
941 }
942 }
943 if (found)
944 return true;
945 exe = tomoyo_get_exe();
946 if (!exe)
947 return false;
948 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
949 policy_list[TOMOYO_ID_MANAGER], head.list) {
950 if (!ptr->head.is_deleted && !ptr->is_domain
951 && !strcmp(exe, ptr->manager->name)) {
952 found = true;
953 break;
954 }
955 }
956 if (!found) { /* Reduce error messages. */
957 static pid_t last_pid;
958 const pid_t pid = current->pid;
959 if (last_pid != pid) {
960 printk(KERN_WARNING "%s ( %s ) is not permitted to "
961 "update policies.\n", domainname->name, exe);
962 last_pid = pid;
963 }
964 }
965 kfree(exe);
966 return found;
967 }
968
969 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
970 (unsigned int serial);
971
972 /**
973 * tomoyo_select_domain - Parse select command.
974 *
975 * @head: Pointer to "struct tomoyo_io_buffer".
976 * @data: String to parse.
977 *
978 * Returns true on success, false otherwise.
979 *
980 * Caller holds tomoyo_read_lock().
981 */
982 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
983 const char *data)
984 {
985 unsigned int pid;
986 struct tomoyo_domain_info *domain = NULL;
987 bool global_pid = false;
988 if (strncmp(data, "select ", 7))
989 return false;
990 data += 7;
991 if (sscanf(data, "pid=%u", &pid) == 1 ||
992 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
993 struct task_struct *p;
994 rcu_read_lock();
995 if (global_pid)
996 p = find_task_by_pid_ns(pid, &init_pid_ns);
997 else
998 p = find_task_by_vpid(pid);
999 if (p)
1000 domain = tomoyo_real_domain(p);
1001 rcu_read_unlock();
1002 } else if (!strncmp(data, "domain=", 7)) {
1003 if (tomoyo_domain_def(data + 7))
1004 domain = tomoyo_find_domain(data + 7);
1005 } else if (sscanf(data, "Q=%u", &pid) == 1) {
1006 domain = tomoyo_find_domain_by_qid(pid);
1007 } else
1008 return false;
1009 head->w.domain = domain;
1010 /* Accessing read_buf is safe because head->io_sem is held. */
1011 if (!head->read_buf)
1012 return true; /* Do nothing if open(O_WRONLY). */
1013 memset(&head->r, 0, sizeof(head->r));
1014 head->r.print_this_domain_only = true;
1015 if (domain)
1016 head->r.domain = &domain->list;
1017 else
1018 head->r.eof = 1;
1019 tomoyo_io_printf(head, "# select %s\n", data);
1020 if (domain && domain->is_deleted)
1021 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1022 return true;
1023 }
1024
1025 /**
1026 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1027 *
1028 * @a: Pointer to "struct tomoyo_acl_info".
1029 * @b: Pointer to "struct tomoyo_acl_info".
1030 *
1031 * Returns true if @a == @b, false otherwise.
1032 */
1033 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1034 const struct tomoyo_acl_info *b)
1035 {
1036 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1037 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1038 return p1->domainname == p2->domainname;
1039 }
1040
1041 /**
1042 * tomoyo_write_task - Update task related list.
1043 *
1044 * @param: Pointer to "struct tomoyo_acl_param".
1045 *
1046 * Returns 0 on success, negative value otherwise.
1047 *
1048 * Caller holds tomoyo_read_lock().
1049 */
1050 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1051 {
1052 int error = -EINVAL;
1053 if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1054 struct tomoyo_task_acl e = {
1055 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1056 .domainname = tomoyo_get_domainname(param),
1057 };
1058 if (e.domainname)
1059 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1060 tomoyo_same_task_acl,
1061 NULL);
1062 tomoyo_put_name(e.domainname);
1063 }
1064 return error;
1065 }
1066
1067 /**
1068 * tomoyo_delete_domain - Delete a domain.
1069 *
1070 * @domainname: The name of domain.
1071 *
1072 * Returns 0 on success, negative value otherwise.
1073 *
1074 * Caller holds tomoyo_read_lock().
1075 */
1076 static int tomoyo_delete_domain(char *domainname)
1077 {
1078 struct tomoyo_domain_info *domain;
1079 struct tomoyo_path_info name;
1080
1081 name.name = domainname;
1082 tomoyo_fill_path_info(&name);
1083 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1084 return -EINTR;
1085 /* Is there an active domain? */
1086 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1087 /* Never delete tomoyo_kernel_domain */
1088 if (domain == &tomoyo_kernel_domain)
1089 continue;
1090 if (domain->is_deleted ||
1091 tomoyo_pathcmp(domain->domainname, &name))
1092 continue;
1093 domain->is_deleted = true;
1094 break;
1095 }
1096 mutex_unlock(&tomoyo_policy_lock);
1097 return 0;
1098 }
1099
1100 /**
1101 * tomoyo_write_domain2 - Write domain policy.
1102 *
1103 * @ns: Pointer to "struct tomoyo_policy_namespace".
1104 * @list: Pointer to "struct list_head".
1105 * @data: Policy to be interpreted.
1106 * @is_delete: True if it is a delete request.
1107 *
1108 * Returns 0 on success, negative value otherwise.
1109 *
1110 * Caller holds tomoyo_read_lock().
1111 */
1112 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1113 struct list_head *list, char *data,
1114 const bool is_delete)
1115 {
1116 struct tomoyo_acl_param param = {
1117 .ns = ns,
1118 .list = list,
1119 .data = data,
1120 .is_delete = is_delete,
1121 };
1122 static const struct {
1123 const char *keyword;
1124 int (*write) (struct tomoyo_acl_param *);
1125 } tomoyo_callback[5] = {
1126 { "file ", tomoyo_write_file },
1127 { "network inet ", tomoyo_write_inet_network },
1128 { "network unix ", tomoyo_write_unix_network },
1129 { "misc ", tomoyo_write_misc },
1130 { "task ", tomoyo_write_task },
1131 };
1132 u8 i;
1133
1134 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1135 if (!tomoyo_str_starts(&param.data,
1136 tomoyo_callback[i].keyword))
1137 continue;
1138 return tomoyo_callback[i].write(&param);
1139 }
1140 return -EINVAL;
1141 }
1142
1143 /* String table for domain flags. */
1144 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1145 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1146 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1147 };
1148
1149 /**
1150 * tomoyo_write_domain - Write domain policy.
1151 *
1152 * @head: Pointer to "struct tomoyo_io_buffer".
1153 *
1154 * Returns 0 on success, negative value otherwise.
1155 *
1156 * Caller holds tomoyo_read_lock().
1157 */
1158 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1159 {
1160 char *data = head->write_buf;
1161 struct tomoyo_policy_namespace *ns;
1162 struct tomoyo_domain_info *domain = head->w.domain;
1163 const bool is_delete = head->w.is_delete;
1164 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1165 unsigned int profile;
1166 if (*data == '<') {
1167 int ret = 0;
1168 domain = NULL;
1169 if (is_delete)
1170 ret = tomoyo_delete_domain(data);
1171 else if (is_select)
1172 domain = tomoyo_find_domain(data);
1173 else
1174 domain = tomoyo_assign_domain(data, false);
1175 head->w.domain = domain;
1176 return ret;
1177 }
1178 if (!domain)
1179 return -EINVAL;
1180 ns = domain->ns;
1181 if (sscanf(data, "use_profile %u", &profile) == 1
1182 && profile < TOMOYO_MAX_PROFILES) {
1183 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1184 domain->profile = (u8) profile;
1185 return 0;
1186 }
1187 if (sscanf(data, "use_group %u\n", &profile) == 1
1188 && profile < TOMOYO_MAX_ACL_GROUPS) {
1189 if (!is_delete)
1190 domain->group = (u8) profile;
1191 return 0;
1192 }
1193 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1194 const char *cp = tomoyo_dif[profile];
1195 if (strncmp(data, cp, strlen(cp) - 1))
1196 continue;
1197 domain->flags[profile] = !is_delete;
1198 return 0;
1199 }
1200 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1201 is_delete);
1202 }
1203
1204 /**
1205 * tomoyo_print_condition - Print condition part.
1206 *
1207 * @head: Pointer to "struct tomoyo_io_buffer".
1208 * @cond: Pointer to "struct tomoyo_condition".
1209 *
1210 * Returns true on success, false otherwise.
1211 */
1212 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1213 const struct tomoyo_condition *cond)
1214 {
1215 switch (head->r.cond_step) {
1216 case 0:
1217 head->r.cond_index = 0;
1218 head->r.cond_step++;
1219 if (cond->transit) {
1220 tomoyo_set_space(head);
1221 tomoyo_set_string(head, cond->transit->name);
1222 }
1223 /* fall through */
1224 case 1:
1225 {
1226 const u16 condc = cond->condc;
1227 const struct tomoyo_condition_element *condp =
1228 (typeof(condp)) (cond + 1);
1229 const struct tomoyo_number_union *numbers_p =
1230 (typeof(numbers_p)) (condp + condc);
1231 const struct tomoyo_name_union *names_p =
1232 (typeof(names_p))
1233 (numbers_p + cond->numbers_count);
1234 const struct tomoyo_argv *argv =
1235 (typeof(argv)) (names_p + cond->names_count);
1236 const struct tomoyo_envp *envp =
1237 (typeof(envp)) (argv + cond->argc);
1238 u16 skip;
1239 for (skip = 0; skip < head->r.cond_index; skip++) {
1240 const u8 left = condp->left;
1241 const u8 right = condp->right;
1242 condp++;
1243 switch (left) {
1244 case TOMOYO_ARGV_ENTRY:
1245 argv++;
1246 continue;
1247 case TOMOYO_ENVP_ENTRY:
1248 envp++;
1249 continue;
1250 case TOMOYO_NUMBER_UNION:
1251 numbers_p++;
1252 break;
1253 }
1254 switch (right) {
1255 case TOMOYO_NAME_UNION:
1256 names_p++;
1257 break;
1258 case TOMOYO_NUMBER_UNION:
1259 numbers_p++;
1260 break;
1261 }
1262 }
1263 while (head->r.cond_index < condc) {
1264 const u8 match = condp->equals;
1265 const u8 left = condp->left;
1266 const u8 right = condp->right;
1267 if (!tomoyo_flush(head))
1268 return false;
1269 condp++;
1270 head->r.cond_index++;
1271 tomoyo_set_space(head);
1272 switch (left) {
1273 case TOMOYO_ARGV_ENTRY:
1274 tomoyo_io_printf(head,
1275 "exec.argv[%lu]%s=\"",
1276 argv->index, argv->
1277 is_not ? "!" : "");
1278 tomoyo_set_string(head,
1279 argv->value->name);
1280 tomoyo_set_string(head, "\"");
1281 argv++;
1282 continue;
1283 case TOMOYO_ENVP_ENTRY:
1284 tomoyo_set_string(head,
1285 "exec.envp[\"");
1286 tomoyo_set_string(head,
1287 envp->name->name);
1288 tomoyo_io_printf(head, "\"]%s=", envp->
1289 is_not ? "!" : "");
1290 if (envp->value) {
1291 tomoyo_set_string(head, "\"");
1292 tomoyo_set_string(head, envp->
1293 value->name);
1294 tomoyo_set_string(head, "\"");
1295 } else {
1296 tomoyo_set_string(head,
1297 "NULL");
1298 }
1299 envp++;
1300 continue;
1301 case TOMOYO_NUMBER_UNION:
1302 tomoyo_print_number_union_nospace
1303 (head, numbers_p++);
1304 break;
1305 default:
1306 tomoyo_set_string(head,
1307 tomoyo_condition_keyword[left]);
1308 break;
1309 }
1310 tomoyo_set_string(head, match ? "=" : "!=");
1311 switch (right) {
1312 case TOMOYO_NAME_UNION:
1313 tomoyo_print_name_union_quoted
1314 (head, names_p++);
1315 break;
1316 case TOMOYO_NUMBER_UNION:
1317 tomoyo_print_number_union_nospace
1318 (head, numbers_p++);
1319 break;
1320 default:
1321 tomoyo_set_string(head,
1322 tomoyo_condition_keyword[right]);
1323 break;
1324 }
1325 }
1326 }
1327 head->r.cond_step++;
1328 /* fall through */
1329 case 2:
1330 if (!tomoyo_flush(head))
1331 break;
1332 head->r.cond_step++;
1333 /* fall through */
1334 case 3:
1335 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1336 tomoyo_io_printf(head, " grant_log=%s",
1337 tomoyo_yesno(cond->grant_log ==
1338 TOMOYO_GRANTLOG_YES));
1339 tomoyo_set_lf(head);
1340 return true;
1341 }
1342 return false;
1343 }
1344
1345 /**
1346 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1347 *
1348 * @head: Pointer to "struct tomoyo_io_buffer".
1349 * @category: Category name.
1350 *
1351 * Returns nothing.
1352 */
1353 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1354 const char *category)
1355 {
1356 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1357 tomoyo_print_namespace(head);
1358 tomoyo_io_printf(head, "acl_group %u ",
1359 head->r.acl_group_index);
1360 }
1361 tomoyo_set_string(head, category);
1362 }
1363
1364 /**
1365 * tomoyo_print_entry - Print an ACL entry.
1366 *
1367 * @head: Pointer to "struct tomoyo_io_buffer".
1368 * @acl: Pointer to an ACL entry.
1369 *
1370 * Returns true on success, false otherwise.
1371 */
1372 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1373 struct tomoyo_acl_info *acl)
1374 {
1375 const u8 acl_type = acl->type;
1376 bool first = true;
1377 u8 bit;
1378
1379 if (head->r.print_cond_part)
1380 goto print_cond_part;
1381 if (acl->is_deleted)
1382 return true;
1383 if (!tomoyo_flush(head))
1384 return false;
1385 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1386 struct tomoyo_path_acl *ptr =
1387 container_of(acl, typeof(*ptr), head);
1388 const u16 perm = ptr->perm;
1389 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1390 if (!(perm & (1 << bit)))
1391 continue;
1392 if (head->r.print_transition_related_only &&
1393 bit != TOMOYO_TYPE_EXECUTE)
1394 continue;
1395 if (first) {
1396 tomoyo_set_group(head, "file ");
1397 first = false;
1398 } else {
1399 tomoyo_set_slash(head);
1400 }
1401 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1402 }
1403 if (first)
1404 return true;
1405 tomoyo_print_name_union(head, &ptr->name);
1406 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1407 struct tomoyo_task_acl *ptr =
1408 container_of(acl, typeof(*ptr), head);
1409 tomoyo_set_group(head, "task ");
1410 tomoyo_set_string(head, "manual_domain_transition ");
1411 tomoyo_set_string(head, ptr->domainname->name);
1412 } else if (head->r.print_transition_related_only) {
1413 return true;
1414 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1415 struct tomoyo_path2_acl *ptr =
1416 container_of(acl, typeof(*ptr), head);
1417 const u8 perm = ptr->perm;
1418 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1419 if (!(perm & (1 << bit)))
1420 continue;
1421 if (first) {
1422 tomoyo_set_group(head, "file ");
1423 first = false;
1424 } else {
1425 tomoyo_set_slash(head);
1426 }
1427 tomoyo_set_string(head, tomoyo_mac_keywords
1428 [tomoyo_pp2mac[bit]]);
1429 }
1430 if (first)
1431 return true;
1432 tomoyo_print_name_union(head, &ptr->name1);
1433 tomoyo_print_name_union(head, &ptr->name2);
1434 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1435 struct tomoyo_path_number_acl *ptr =
1436 container_of(acl, typeof(*ptr), head);
1437 const u8 perm = ptr->perm;
1438 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1439 if (!(perm & (1 << bit)))
1440 continue;
1441 if (first) {
1442 tomoyo_set_group(head, "file ");
1443 first = false;
1444 } else {
1445 tomoyo_set_slash(head);
1446 }
1447 tomoyo_set_string(head, tomoyo_mac_keywords
1448 [tomoyo_pn2mac[bit]]);
1449 }
1450 if (first)
1451 return true;
1452 tomoyo_print_name_union(head, &ptr->name);
1453 tomoyo_print_number_union(head, &ptr->number);
1454 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1455 struct tomoyo_mkdev_acl *ptr =
1456 container_of(acl, typeof(*ptr), head);
1457 const u8 perm = ptr->perm;
1458 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1459 if (!(perm & (1 << bit)))
1460 continue;
1461 if (first) {
1462 tomoyo_set_group(head, "file ");
1463 first = false;
1464 } else {
1465 tomoyo_set_slash(head);
1466 }
1467 tomoyo_set_string(head, tomoyo_mac_keywords
1468 [tomoyo_pnnn2mac[bit]]);
1469 }
1470 if (first)
1471 return true;
1472 tomoyo_print_name_union(head, &ptr->name);
1473 tomoyo_print_number_union(head, &ptr->mode);
1474 tomoyo_print_number_union(head, &ptr->major);
1475 tomoyo_print_number_union(head, &ptr->minor);
1476 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1477 struct tomoyo_inet_acl *ptr =
1478 container_of(acl, typeof(*ptr), head);
1479 const u8 perm = ptr->perm;
1480
1481 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1482 if (!(perm & (1 << bit)))
1483 continue;
1484 if (first) {
1485 tomoyo_set_group(head, "network inet ");
1486 tomoyo_set_string(head, tomoyo_proto_keyword
1487 [ptr->protocol]);
1488 tomoyo_set_space(head);
1489 first = false;
1490 } else {
1491 tomoyo_set_slash(head);
1492 }
1493 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1494 }
1495 if (first)
1496 return true;
1497 tomoyo_set_space(head);
1498 if (ptr->address.group) {
1499 tomoyo_set_string(head, "@");
1500 tomoyo_set_string(head, ptr->address.group->group_name
1501 ->name);
1502 } else {
1503 char buf[128];
1504 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1505 tomoyo_io_printf(head, "%s", buf);
1506 }
1507 tomoyo_print_number_union(head, &ptr->port);
1508 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1509 struct tomoyo_unix_acl *ptr =
1510 container_of(acl, typeof(*ptr), head);
1511 const u8 perm = ptr->perm;
1512
1513 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1514 if (!(perm & (1 << bit)))
1515 continue;
1516 if (first) {
1517 tomoyo_set_group(head, "network unix ");
1518 tomoyo_set_string(head, tomoyo_proto_keyword
1519 [ptr->protocol]);
1520 tomoyo_set_space(head);
1521 first = false;
1522 } else {
1523 tomoyo_set_slash(head);
1524 }
1525 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1526 }
1527 if (first)
1528 return true;
1529 tomoyo_print_name_union(head, &ptr->name);
1530 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1531 struct tomoyo_mount_acl *ptr =
1532 container_of(acl, typeof(*ptr), head);
1533 tomoyo_set_group(head, "file mount");
1534 tomoyo_print_name_union(head, &ptr->dev_name);
1535 tomoyo_print_name_union(head, &ptr->dir_name);
1536 tomoyo_print_name_union(head, &ptr->fs_type);
1537 tomoyo_print_number_union(head, &ptr->flags);
1538 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1539 struct tomoyo_env_acl *ptr =
1540 container_of(acl, typeof(*ptr), head);
1541
1542 tomoyo_set_group(head, "misc env ");
1543 tomoyo_set_string(head, ptr->env->name);
1544 }
1545 if (acl->cond) {
1546 head->r.print_cond_part = true;
1547 head->r.cond_step = 0;
1548 if (!tomoyo_flush(head))
1549 return false;
1550 print_cond_part:
1551 if (!tomoyo_print_condition(head, acl->cond))
1552 return false;
1553 head->r.print_cond_part = false;
1554 } else {
1555 tomoyo_set_lf(head);
1556 }
1557 return true;
1558 }
1559
1560 /**
1561 * tomoyo_read_domain2 - Read domain policy.
1562 *
1563 * @head: Pointer to "struct tomoyo_io_buffer".
1564 * @list: Pointer to "struct list_head".
1565 *
1566 * Caller holds tomoyo_read_lock().
1567 *
1568 * Returns true on success, false otherwise.
1569 */
1570 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1571 struct list_head *list)
1572 {
1573 list_for_each_cookie(head->r.acl, list) {
1574 struct tomoyo_acl_info *ptr =
1575 list_entry(head->r.acl, typeof(*ptr), list);
1576 if (!tomoyo_print_entry(head, ptr))
1577 return false;
1578 }
1579 head->r.acl = NULL;
1580 return true;
1581 }
1582
1583 /**
1584 * tomoyo_read_domain - Read domain policy.
1585 *
1586 * @head: Pointer to "struct tomoyo_io_buffer".
1587 *
1588 * Caller holds tomoyo_read_lock().
1589 */
1590 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1591 {
1592 if (head->r.eof)
1593 return;
1594 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1595 struct tomoyo_domain_info *domain =
1596 list_entry(head->r.domain, typeof(*domain), list);
1597 switch (head->r.step) {
1598 u8 i;
1599 case 0:
1600 if (domain->is_deleted &&
1601 !head->r.print_this_domain_only)
1602 continue;
1603 /* Print domainname and flags. */
1604 tomoyo_set_string(head, domain->domainname->name);
1605 tomoyo_set_lf(head);
1606 tomoyo_io_printf(head, "use_profile %u\n",
1607 domain->profile);
1608 tomoyo_io_printf(head, "use_group %u\n",
1609 domain->group);
1610 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1611 if (domain->flags[i])
1612 tomoyo_set_string(head, tomoyo_dif[i]);
1613 head->r.step++;
1614 tomoyo_set_lf(head);
1615 /* fall through */
1616 case 1:
1617 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1618 return;
1619 head->r.step++;
1620 if (!tomoyo_set_lf(head))
1621 return;
1622 /* fall through */
1623 case 2:
1624 head->r.step = 0;
1625 if (head->r.print_this_domain_only)
1626 goto done;
1627 }
1628 }
1629 done:
1630 head->r.eof = true;
1631 }
1632
1633 /**
1634 * tomoyo_write_pid: Specify PID to obtain domainname.
1635 *
1636 * @head: Pointer to "struct tomoyo_io_buffer".
1637 *
1638 * Returns 0.
1639 */
1640 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1641 {
1642 head->r.eof = false;
1643 return 0;
1644 }
1645
1646 /**
1647 * tomoyo_read_pid - Get domainname of the specified PID.
1648 *
1649 * @head: Pointer to "struct tomoyo_io_buffer".
1650 *
1651 * Returns the domainname which the specified PID is in on success,
1652 * empty string otherwise.
1653 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1654 * using read()/write() interface rather than sysctl() interface.
1655 */
1656 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1657 {
1658 char *buf = head->write_buf;
1659 bool global_pid = false;
1660 unsigned int pid;
1661 struct task_struct *p;
1662 struct tomoyo_domain_info *domain = NULL;
1663
1664 /* Accessing write_buf is safe because head->io_sem is held. */
1665 if (!buf) {
1666 head->r.eof = true;
1667 return; /* Do nothing if open(O_RDONLY). */
1668 }
1669 if (head->r.w_pos || head->r.eof)
1670 return;
1671 head->r.eof = true;
1672 if (tomoyo_str_starts(&buf, "global-pid "))
1673 global_pid = true;
1674 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1675 rcu_read_lock();
1676 if (global_pid)
1677 p = find_task_by_pid_ns(pid, &init_pid_ns);
1678 else
1679 p = find_task_by_vpid(pid);
1680 if (p)
1681 domain = tomoyo_real_domain(p);
1682 rcu_read_unlock();
1683 if (!domain)
1684 return;
1685 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1686 tomoyo_set_string(head, domain->domainname->name);
1687 }
1688
1689 /* String table for domain transition control keywords. */
1690 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1691 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1692 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1693 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1694 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1695 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1696 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1697 };
1698
1699 /* String table for grouping keywords. */
1700 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1701 [TOMOYO_PATH_GROUP] = "path_group ",
1702 [TOMOYO_NUMBER_GROUP] = "number_group ",
1703 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1704 };
1705
1706 /**
1707 * tomoyo_write_exception - Write exception policy.
1708 *
1709 * @head: Pointer to "struct tomoyo_io_buffer".
1710 *
1711 * Returns 0 on success, negative value otherwise.
1712 *
1713 * Caller holds tomoyo_read_lock().
1714 */
1715 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1716 {
1717 const bool is_delete = head->w.is_delete;
1718 struct tomoyo_acl_param param = {
1719 .ns = head->w.ns,
1720 .is_delete = is_delete,
1721 .data = head->write_buf,
1722 };
1723 u8 i;
1724 if (tomoyo_str_starts(&param.data, "aggregator "))
1725 return tomoyo_write_aggregator(&param);
1726 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1727 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1728 return tomoyo_write_transition_control(&param, i);
1729 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1730 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1731 return tomoyo_write_group(&param, i);
1732 if (tomoyo_str_starts(&param.data, "acl_group ")) {
1733 unsigned int group;
1734 char *data;
1735 group = simple_strtoul(param.data, &data, 10);
1736 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1737 return tomoyo_write_domain2
1738 (head->w.ns, &head->w.ns->acl_group[group],
1739 data, is_delete);
1740 }
1741 return -EINVAL;
1742 }
1743
1744 /**
1745 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1746 *
1747 * @head: Pointer to "struct tomoyo_io_buffer".
1748 * @idx: Index number.
1749 *
1750 * Returns true on success, false otherwise.
1751 *
1752 * Caller holds tomoyo_read_lock().
1753 */
1754 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1755 {
1756 struct tomoyo_policy_namespace *ns =
1757 container_of(head->r.ns, typeof(*ns), namespace_list);
1758 struct list_head *list = &ns->group_list[idx];
1759 list_for_each_cookie(head->r.group, list) {
1760 struct tomoyo_group *group =
1761 list_entry(head->r.group, typeof(*group), head.list);
1762 list_for_each_cookie(head->r.acl, &group->member_list) {
1763 struct tomoyo_acl_head *ptr =
1764 list_entry(head->r.acl, typeof(*ptr), list);
1765 if (ptr->is_deleted)
1766 continue;
1767 if (!tomoyo_flush(head))
1768 return false;
1769 tomoyo_print_namespace(head);
1770 tomoyo_set_string(head, tomoyo_group_name[idx]);
1771 tomoyo_set_string(head, group->group_name->name);
1772 if (idx == TOMOYO_PATH_GROUP) {
1773 tomoyo_set_space(head);
1774 tomoyo_set_string(head, container_of
1775 (ptr, struct tomoyo_path_group,
1776 head)->member_name->name);
1777 } else if (idx == TOMOYO_NUMBER_GROUP) {
1778 tomoyo_print_number_union(head, &container_of
1779 (ptr,
1780 struct tomoyo_number_group,
1781 head)->number);
1782 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1783 char buffer[128];
1784
1785 struct tomoyo_address_group *member =
1786 container_of(ptr, typeof(*member),
1787 head);
1788 tomoyo_print_ip(buffer, sizeof(buffer),
1789 &member->address);
1790 tomoyo_io_printf(head, " %s", buffer);
1791 }
1792 tomoyo_set_lf(head);
1793 }
1794 head->r.acl = NULL;
1795 }
1796 head->r.group = NULL;
1797 return true;
1798 }
1799
1800 /**
1801 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1802 *
1803 * @head: Pointer to "struct tomoyo_io_buffer".
1804 * @idx: Index number.
1805 *
1806 * Returns true on success, false otherwise.
1807 *
1808 * Caller holds tomoyo_read_lock().
1809 */
1810 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1811 {
1812 struct tomoyo_policy_namespace *ns =
1813 container_of(head->r.ns, typeof(*ns), namespace_list);
1814 struct list_head *list = &ns->policy_list[idx];
1815 list_for_each_cookie(head->r.acl, list) {
1816 struct tomoyo_acl_head *acl =
1817 container_of(head->r.acl, typeof(*acl), list);
1818 if (acl->is_deleted)
1819 continue;
1820 if (!tomoyo_flush(head))
1821 return false;
1822 switch (idx) {
1823 case TOMOYO_ID_TRANSITION_CONTROL:
1824 {
1825 struct tomoyo_transition_control *ptr =
1826 container_of(acl, typeof(*ptr), head);
1827 tomoyo_print_namespace(head);
1828 tomoyo_set_string(head, tomoyo_transition_type
1829 [ptr->type]);
1830 tomoyo_set_string(head, ptr->program ?
1831 ptr->program->name : "any");
1832 tomoyo_set_string(head, " from ");
1833 tomoyo_set_string(head, ptr->domainname ?
1834 ptr->domainname->name :
1835 "any");
1836 }
1837 break;
1838 case TOMOYO_ID_AGGREGATOR:
1839 {
1840 struct tomoyo_aggregator *ptr =
1841 container_of(acl, typeof(*ptr), head);
1842 tomoyo_print_namespace(head);
1843 tomoyo_set_string(head, "aggregator ");
1844 tomoyo_set_string(head,
1845 ptr->original_name->name);
1846 tomoyo_set_space(head);
1847 tomoyo_set_string(head,
1848 ptr->aggregated_name->name);
1849 }
1850 break;
1851 default:
1852 continue;
1853 }
1854 tomoyo_set_lf(head);
1855 }
1856 head->r.acl = NULL;
1857 return true;
1858 }
1859
1860 /**
1861 * tomoyo_read_exception - Read exception policy.
1862 *
1863 * @head: Pointer to "struct tomoyo_io_buffer".
1864 *
1865 * Caller holds tomoyo_read_lock().
1866 */
1867 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1868 {
1869 struct tomoyo_policy_namespace *ns =
1870 container_of(head->r.ns, typeof(*ns), namespace_list);
1871 if (head->r.eof)
1872 return;
1873 while (head->r.step < TOMOYO_MAX_POLICY &&
1874 tomoyo_read_policy(head, head->r.step))
1875 head->r.step++;
1876 if (head->r.step < TOMOYO_MAX_POLICY)
1877 return;
1878 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1879 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1880 head->r.step++;
1881 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1882 return;
1883 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1884 + TOMOYO_MAX_ACL_GROUPS) {
1885 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1886 - TOMOYO_MAX_GROUP;
1887 if (!tomoyo_read_domain2(head, &ns->acl_group
1888 [head->r.acl_group_index]))
1889 return;
1890 head->r.step++;
1891 }
1892 head->r.eof = true;
1893 }
1894
1895 /* Wait queue for kernel -> userspace notification. */
1896 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1897 /* Wait queue for userspace -> kernel notification. */
1898 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1899
1900 /* Structure for query. */
1901 struct tomoyo_query {
1902 struct list_head list;
1903 struct tomoyo_domain_info *domain;
1904 char *query;
1905 size_t query_len;
1906 unsigned int serial;
1907 u8 timer;
1908 u8 answer;
1909 u8 retry;
1910 };
1911
1912 /* The list for "struct tomoyo_query". */
1913 static LIST_HEAD(tomoyo_query_list);
1914
1915 /* Lock for manipulating tomoyo_query_list. */
1916 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1917
1918 /*
1919 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1920 * interface.
1921 */
1922 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1923
1924 /**
1925 * tomoyo_truncate - Truncate a line.
1926 *
1927 * @str: String to truncate.
1928 *
1929 * Returns length of truncated @str.
1930 */
1931 static int tomoyo_truncate(char *str)
1932 {
1933 char *start = str;
1934 while (*(unsigned char *) str > (unsigned char) ' ')
1935 str++;
1936 *str = '\0';
1937 return strlen(start) + 1;
1938 }
1939
1940 /**
1941 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1942 *
1943 * @domain: Pointer to "struct tomoyo_domain_info".
1944 * @header: Lines containing ACL.
1945 *
1946 * Returns nothing.
1947 */
1948 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1949 {
1950 char *buffer;
1951 char *realpath = NULL;
1952 char *argv0 = NULL;
1953 char *symlink = NULL;
1954 char *cp = strchr(header, '\n');
1955 int len;
1956 if (!cp)
1957 return;
1958 cp = strchr(cp + 1, '\n');
1959 if (!cp)
1960 return;
1961 *cp++ = '\0';
1962 len = strlen(cp) + 1;
1963 /* strstr() will return NULL if ordering is wrong. */
1964 if (*cp == 'f') {
1965 argv0 = strstr(header, " argv[]={ \"");
1966 if (argv0) {
1967 argv0 += 10;
1968 len += tomoyo_truncate(argv0) + 14;
1969 }
1970 realpath = strstr(header, " exec={ realpath=\"");
1971 if (realpath) {
1972 realpath += 8;
1973 len += tomoyo_truncate(realpath) + 6;
1974 }
1975 symlink = strstr(header, " symlink.target=\"");
1976 if (symlink)
1977 len += tomoyo_truncate(symlink + 1) + 1;
1978 }
1979 buffer = kmalloc(len, GFP_NOFS);
1980 if (!buffer)
1981 return;
1982 snprintf(buffer, len - 1, "%s", cp);
1983 if (realpath)
1984 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1985 if (argv0)
1986 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1987 if (symlink)
1988 tomoyo_addprintf(buffer, len, "%s", symlink);
1989 tomoyo_normalize_line(buffer);
1990 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1991 false))
1992 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1993 kfree(buffer);
1994 }
1995
1996 /**
1997 * tomoyo_supervisor - Ask for the supervisor's decision.
1998 *
1999 * @r: Pointer to "struct tomoyo_request_info".
2000 * @fmt: The printf()'s format string, followed by parameters.
2001 *
2002 * Returns 0 if the supervisor decided to permit the access request which
2003 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2004 * supervisor decided to retry the access request which violated the policy in
2005 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2006 */
2007 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2008 {
2009 va_list args;
2010 int error;
2011 int len;
2012 static unsigned int tomoyo_serial;
2013 struct tomoyo_query entry = { };
2014 bool quota_exceeded = false;
2015 va_start(args, fmt);
2016 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2017 va_end(args);
2018 /* Write /sys/kernel/security/tomoyo/audit. */
2019 va_start(args, fmt);
2020 tomoyo_write_log2(r, len, fmt, args);
2021 va_end(args);
2022 /* Nothing more to do if granted. */
2023 if (r->granted)
2024 return 0;
2025 if (r->mode)
2026 tomoyo_update_stat(r->mode);
2027 switch (r->mode) {
2028 case TOMOYO_CONFIG_ENFORCING:
2029 error = -EPERM;
2030 if (atomic_read(&tomoyo_query_observers))
2031 break;
2032 goto out;
2033 case TOMOYO_CONFIG_LEARNING:
2034 error = 0;
2035 /* Check max_learning_entry parameter. */
2036 if (tomoyo_domain_quota_is_ok(r))
2037 break;
2038 /* fall through */
2039 default:
2040 return 0;
2041 }
2042 /* Get message. */
2043 va_start(args, fmt);
2044 entry.query = tomoyo_init_log(r, len, fmt, args);
2045 va_end(args);
2046 if (!entry.query)
2047 goto out;
2048 entry.query_len = strlen(entry.query) + 1;
2049 if (!error) {
2050 tomoyo_add_entry(r->domain, entry.query);
2051 goto out;
2052 }
2053 len = tomoyo_round2(entry.query_len);
2054 entry.domain = r->domain;
2055 spin_lock(&tomoyo_query_list_lock);
2056 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2057 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2058 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2059 quota_exceeded = true;
2060 } else {
2061 entry.serial = tomoyo_serial++;
2062 entry.retry = r->retry;
2063 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2064 list_add_tail(&entry.list, &tomoyo_query_list);
2065 }
2066 spin_unlock(&tomoyo_query_list_lock);
2067 if (quota_exceeded)
2068 goto out;
2069 /* Give 10 seconds for supervisor's opinion. */
2070 while (entry.timer < 10) {
2071 wake_up_all(&tomoyo_query_wait);
2072 if (wait_event_interruptible_timeout
2073 (tomoyo_answer_wait, entry.answer ||
2074 !atomic_read(&tomoyo_query_observers), HZ))
2075 break;
2076 else
2077 entry.timer++;
2078 }
2079 spin_lock(&tomoyo_query_list_lock);
2080 list_del(&entry.list);
2081 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2082 spin_unlock(&tomoyo_query_list_lock);
2083 switch (entry.answer) {
2084 case 3: /* Asked to retry by administrator. */
2085 error = TOMOYO_RETRY_REQUEST;
2086 r->retry++;
2087 break;
2088 case 1:
2089 /* Granted by administrator. */
2090 error = 0;
2091 break;
2092 default:
2093 /* Timed out or rejected by administrator. */
2094 break;
2095 }
2096 out:
2097 kfree(entry.query);
2098 return error;
2099 }
2100
2101 /**
2102 * tomoyo_find_domain_by_qid - Get domain by query id.
2103 *
2104 * @serial: Query ID assigned by tomoyo_supervisor().
2105 *
2106 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2107 */
2108 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2109 (unsigned int serial)
2110 {
2111 struct tomoyo_query *ptr;
2112 struct tomoyo_domain_info *domain = NULL;
2113 spin_lock(&tomoyo_query_list_lock);
2114 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2115 if (ptr->serial != serial)
2116 continue;
2117 domain = ptr->domain;
2118 break;
2119 }
2120 spin_unlock(&tomoyo_query_list_lock);
2121 return domain;
2122 }
2123
2124 /**
2125 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2126 *
2127 * @file: Pointer to "struct file".
2128 * @wait: Pointer to "poll_table".
2129 *
2130 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2131 *
2132 * Waits for access requests which violated policy in enforcing mode.
2133 */
2134 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2135 {
2136 if (!list_empty(&tomoyo_query_list))
2137 return POLLIN | POLLRDNORM;
2138 poll_wait(file, &tomoyo_query_wait, wait);
2139 if (!list_empty(&tomoyo_query_list))
2140 return POLLIN | POLLRDNORM;
2141 return 0;
2142 }
2143
2144 /**
2145 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2146 *
2147 * @head: Pointer to "struct tomoyo_io_buffer".
2148 */
2149 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2150 {
2151 struct list_head *tmp;
2152 unsigned int pos = 0;
2153 size_t len = 0;
2154 char *buf;
2155 if (head->r.w_pos)
2156 return;
2157 if (head->read_buf) {
2158 kfree(head->read_buf);
2159 head->read_buf = NULL;
2160 }
2161 spin_lock(&tomoyo_query_list_lock);
2162 list_for_each(tmp, &tomoyo_query_list) {
2163 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2164 if (pos++ != head->r.query_index)
2165 continue;
2166 len = ptr->query_len;
2167 break;
2168 }
2169 spin_unlock(&tomoyo_query_list_lock);
2170 if (!len) {
2171 head->r.query_index = 0;
2172 return;
2173 }
2174 buf = kzalloc(len + 32, GFP_NOFS);
2175 if (!buf)
2176 return;
2177 pos = 0;
2178 spin_lock(&tomoyo_query_list_lock);
2179 list_for_each(tmp, &tomoyo_query_list) {
2180 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2181 if (pos++ != head->r.query_index)
2182 continue;
2183 /*
2184 * Some query can be skipped because tomoyo_query_list
2185 * can change, but I don't care.
2186 */
2187 if (len == ptr->query_len)
2188 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2189 ptr->retry, ptr->query);
2190 break;
2191 }
2192 spin_unlock(&tomoyo_query_list_lock);
2193 if (buf[0]) {
2194 head->read_buf = buf;
2195 head->r.w[head->r.w_pos++] = buf;
2196 head->r.query_index++;
2197 } else {
2198 kfree(buf);
2199 }
2200 }
2201
2202 /**
2203 * tomoyo_write_answer - Write the supervisor's decision.
2204 *
2205 * @head: Pointer to "struct tomoyo_io_buffer".
2206 *
2207 * Returns 0 on success, -EINVAL otherwise.
2208 */
2209 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2210 {
2211 char *data = head->write_buf;
2212 struct list_head *tmp;
2213 unsigned int serial;
2214 unsigned int answer;
2215 spin_lock(&tomoyo_query_list_lock);
2216 list_for_each(tmp, &tomoyo_query_list) {
2217 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2218 ptr->timer = 0;
2219 }
2220 spin_unlock(&tomoyo_query_list_lock);
2221 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2222 return -EINVAL;
2223 spin_lock(&tomoyo_query_list_lock);
2224 list_for_each(tmp, &tomoyo_query_list) {
2225 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2226 if (ptr->serial != serial)
2227 continue;
2228 ptr->answer = answer;
2229 /* Remove from tomoyo_query_list. */
2230 if (ptr->answer)
2231 list_del_init(&ptr->list);
2232 break;
2233 }
2234 spin_unlock(&tomoyo_query_list_lock);
2235 return 0;
2236 }
2237
2238 /**
2239 * tomoyo_read_version: Get version.
2240 *
2241 * @head: Pointer to "struct tomoyo_io_buffer".
2242 *
2243 * Returns version information.
2244 */
2245 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2246 {
2247 if (!head->r.eof) {
2248 tomoyo_io_printf(head, "2.5.0");
2249 head->r.eof = true;
2250 }
2251 }
2252
2253 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2254 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2255 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2256 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2257 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2258 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2259 };
2260
2261 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2262 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2263 [TOMOYO_MEMORY_POLICY] = "policy:",
2264 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2265 [TOMOYO_MEMORY_QUERY] = "query message:",
2266 };
2267
2268 /* Timestamp counter for last updated. */
2269 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2270 /* Counter for number of updates. */
2271 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2272
2273 /**
2274 * tomoyo_update_stat - Update statistic counters.
2275 *
2276 * @index: Index for policy type.
2277 *
2278 * Returns nothing.
2279 */
2280 void tomoyo_update_stat(const u8 index)
2281 {
2282 struct timeval tv;
2283 do_gettimeofday(&tv);
2284 /*
2285 * I don't use atomic operations because race condition is not fatal.
2286 */
2287 tomoyo_stat_updated[index]++;
2288 tomoyo_stat_modified[index] = tv.tv_sec;
2289 }
2290
2291 /**
2292 * tomoyo_read_stat - Read statistic data.
2293 *
2294 * @head: Pointer to "struct tomoyo_io_buffer".
2295 *
2296 * Returns nothing.
2297 */
2298 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2299 {
2300 u8 i;
2301 unsigned int total = 0;
2302 if (head->r.eof)
2303 return;
2304 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2305 tomoyo_io_printf(head, "Policy %-30s %10u",
2306 tomoyo_policy_headers[i],
2307 tomoyo_stat_updated[i]);
2308 if (tomoyo_stat_modified[i]) {
2309 struct tomoyo_time stamp;
2310 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2311 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2312 "%02u:%02u:%02u)",
2313 stamp.year, stamp.month, stamp.day,
2314 stamp.hour, stamp.min, stamp.sec);
2315 }
2316 tomoyo_set_lf(head);
2317 }
2318 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2319 unsigned int used = tomoyo_memory_used[i];
2320 total += used;
2321 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2322 tomoyo_memory_headers[i], used);
2323 used = tomoyo_memory_quota[i];
2324 if (used)
2325 tomoyo_io_printf(head, " (Quota: %10u)", used);
2326 tomoyo_set_lf(head);
2327 }
2328 tomoyo_io_printf(head, "Total memory used: %10u\n",
2329 total);
2330 head->r.eof = true;
2331 }
2332
2333 /**
2334 * tomoyo_write_stat - Set memory quota.
2335 *
2336 * @head: Pointer to "struct tomoyo_io_buffer".
2337 *
2338 * Returns 0.
2339 */
2340 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2341 {
2342 char *data = head->write_buf;
2343 u8 i;
2344 if (tomoyo_str_starts(&data, "Memory used by "))
2345 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2346 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2347 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2348 return 0;
2349 }
2350
2351 /**
2352 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2353 *
2354 * @type: Type of interface.
2355 * @file: Pointer to "struct file".
2356 *
2357 * Returns 0 on success, negative value otherwise.
2358 */
2359 int tomoyo_open_control(const u8 type, struct file *file)
2360 {
2361 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2362
2363 if (!head)
2364 return -ENOMEM;
2365 mutex_init(&head->io_sem);
2366 head->type = type;
2367 switch (type) {
2368 case TOMOYO_DOMAINPOLICY:
2369 /* /sys/kernel/security/tomoyo/domain_policy */
2370 head->write = tomoyo_write_domain;
2371 head->read = tomoyo_read_domain;
2372 break;
2373 case TOMOYO_EXCEPTIONPOLICY:
2374 /* /sys/kernel/security/tomoyo/exception_policy */
2375 head->write = tomoyo_write_exception;
2376 head->read = tomoyo_read_exception;
2377 break;
2378 case TOMOYO_AUDIT:
2379 /* /sys/kernel/security/tomoyo/audit */
2380 head->poll = tomoyo_poll_log;
2381 head->read = tomoyo_read_log;
2382 break;
2383 case TOMOYO_PROCESS_STATUS:
2384 /* /sys/kernel/security/tomoyo/.process_status */
2385 head->write = tomoyo_write_pid;
2386 head->read = tomoyo_read_pid;
2387 break;
2388 case TOMOYO_VERSION:
2389 /* /sys/kernel/security/tomoyo/version */
2390 head->read = tomoyo_read_version;
2391 head->readbuf_size = 128;
2392 break;
2393 case TOMOYO_STAT:
2394 /* /sys/kernel/security/tomoyo/stat */
2395 head->write = tomoyo_write_stat;
2396 head->read = tomoyo_read_stat;
2397 head->readbuf_size = 1024;
2398 break;
2399 case TOMOYO_PROFILE:
2400 /* /sys/kernel/security/tomoyo/profile */
2401 head->write = tomoyo_write_profile;
2402 head->read = tomoyo_read_profile;
2403 break;
2404 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2405 head->poll = tomoyo_poll_query;
2406 head->write = tomoyo_write_answer;
2407 head->read = tomoyo_read_query;
2408 break;
2409 case TOMOYO_MANAGER:
2410 /* /sys/kernel/security/tomoyo/manager */
2411 head->write = tomoyo_write_manager;
2412 head->read = tomoyo_read_manager;
2413 break;
2414 }
2415 if (!(file->f_mode & FMODE_READ)) {
2416 /*
2417 * No need to allocate read_buf since it is not opened
2418 * for reading.
2419 */
2420 head->read = NULL;
2421 head->poll = NULL;
2422 } else if (!head->poll) {
2423 /* Don't allocate read_buf for poll() access. */
2424 if (!head->readbuf_size)
2425 head->readbuf_size = 4096 * 2;
2426 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2427 if (!head->read_buf) {
2428 kfree(head);
2429 return -ENOMEM;
2430 }
2431 }
2432 if (!(file->f_mode & FMODE_WRITE)) {
2433 /*
2434 * No need to allocate write_buf since it is not opened
2435 * for writing.
2436 */
2437 head->write = NULL;
2438 } else if (head->write) {
2439 head->writebuf_size = 4096 * 2;
2440 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2441 if (!head->write_buf) {
2442 kfree(head->read_buf);
2443 kfree(head);
2444 return -ENOMEM;
2445 }
2446 }
2447 /*
2448 * If the file is /sys/kernel/security/tomoyo/query , increment the
2449 * observer counter.
2450 * The obserber counter is used by tomoyo_supervisor() to see if
2451 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2452 */
2453 if (type == TOMOYO_QUERY)
2454 atomic_inc(&tomoyo_query_observers);
2455 file->private_data = head;
2456 tomoyo_notify_gc(head, true);
2457 return 0;
2458 }
2459
2460 /**
2461 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2462 *
2463 * @file: Pointer to "struct file".
2464 * @wait: Pointer to "poll_table". Maybe NULL.
2465 *
2466 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2467 * POLLOUT | POLLWRNORM otherwise.
2468 */
2469 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2470 {
2471 struct tomoyo_io_buffer *head = file->private_data;
2472 if (head->poll)
2473 return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2474 return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2475 }
2476
2477 /**
2478 * tomoyo_set_namespace_cursor - Set namespace to read.
2479 *
2480 * @head: Pointer to "struct tomoyo_io_buffer".
2481 *
2482 * Returns nothing.
2483 */
2484 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2485 {
2486 struct list_head *ns;
2487 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2488 head->type != TOMOYO_PROFILE)
2489 return;
2490 /*
2491 * If this is the first read, or reading previous namespace finished
2492 * and has more namespaces to read, update the namespace cursor.
2493 */
2494 ns = head->r.ns;
2495 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2496 /* Clearing is OK because tomoyo_flush() returned true. */
2497 memset(&head->r, 0, sizeof(head->r));
2498 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2499 }
2500 }
2501
2502 /**
2503 * tomoyo_has_more_namespace - Check for unread namespaces.
2504 *
2505 * @head: Pointer to "struct tomoyo_io_buffer".
2506 *
2507 * Returns true if we have more entries to print, false otherwise.
2508 */
2509 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2510 {
2511 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2512 head->type == TOMOYO_PROFILE) && head->r.eof &&
2513 head->r.ns->next != &tomoyo_namespace_list;
2514 }
2515
2516 /**
2517 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2518 *
2519 * @head: Pointer to "struct tomoyo_io_buffer".
2520 * @buffer: Poiner to buffer to write to.
2521 * @buffer_len: Size of @buffer.
2522 *
2523 * Returns bytes read on success, negative value otherwise.
2524 */
2525 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2526 const int buffer_len)
2527 {
2528 int len;
2529 int idx;
2530
2531 if (!head->read)
2532 return -ENOSYS;
2533 if (mutex_lock_interruptible(&head->io_sem))
2534 return -EINTR;
2535 head->read_user_buf = buffer;
2536 head->read_user_buf_avail = buffer_len;
2537 idx = tomoyo_read_lock();
2538 if (tomoyo_flush(head))
2539 /* Call the policy handler. */
2540 do {
2541 tomoyo_set_namespace_cursor(head);
2542 head->read(head);
2543 } while (tomoyo_flush(head) &&
2544 tomoyo_has_more_namespace(head));
2545 tomoyo_read_unlock(idx);
2546 len = head->read_user_buf - buffer;
2547 mutex_unlock(&head->io_sem);
2548 return len;
2549 }
2550
2551 /**
2552 * tomoyo_parse_policy - Parse a policy line.
2553 *
2554 * @head: Poiter to "struct tomoyo_io_buffer".
2555 * @line: Line to parse.
2556 *
2557 * Returns 0 on success, negative value otherwise.
2558 *
2559 * Caller holds tomoyo_read_lock().
2560 */
2561 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2562 {
2563 /* Delete request? */
2564 head->w.is_delete = !strncmp(line, "delete ", 7);
2565 if (head->w.is_delete)
2566 memmove(line, line + 7, strlen(line + 7) + 1);
2567 /* Selecting namespace to update. */
2568 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2569 head->type == TOMOYO_PROFILE) {
2570 if (*line == '<') {
2571 char *cp = strchr(line, ' ');
2572 if (cp) {
2573 *cp++ = '\0';
2574 head->w.ns = tomoyo_assign_namespace(line);
2575 memmove(line, cp, strlen(cp) + 1);
2576 } else
2577 head->w.ns = NULL;
2578 } else
2579 head->w.ns = &tomoyo_kernel_namespace;
2580 /* Don't allow updating if namespace is invalid. */
2581 if (!head->w.ns)
2582 return -ENOENT;
2583 }
2584 /* Do the update. */
2585 return head->write(head);
2586 }
2587
2588 /**
2589 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2590 *
2591 * @head: Pointer to "struct tomoyo_io_buffer".
2592 * @buffer: Pointer to buffer to read from.
2593 * @buffer_len: Size of @buffer.
2594 *
2595 * Returns @buffer_len on success, negative value otherwise.
2596 */
2597 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2598 const char __user *buffer, const int buffer_len)
2599 {
2600 int error = buffer_len;
2601 size_t avail_len = buffer_len;
2602 char *cp0 = head->write_buf;
2603 int idx;
2604 if (!head->write)
2605 return -ENOSYS;
2606 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2607 return -EFAULT;
2608 if (mutex_lock_interruptible(&head->io_sem))
2609 return -EINTR;
2610 head->read_user_buf_avail = 0;
2611 idx = tomoyo_read_lock();
2612 /* Read a line and dispatch it to the policy handler. */
2613 while (avail_len > 0) {
2614 char c;
2615 if (head->w.avail >= head->writebuf_size - 1) {
2616 const int len = head->writebuf_size * 2;
2617 char *cp = kzalloc(len, GFP_NOFS);
2618 if (!cp) {
2619 error = -ENOMEM;
2620 break;
2621 }
2622 memmove(cp, cp0, head->w.avail);
2623 kfree(cp0);
2624 head->write_buf = cp;
2625 cp0 = cp;
2626 head->writebuf_size = len;
2627 }
2628 if (get_user(c, buffer)) {
2629 error = -EFAULT;
2630 break;
2631 }
2632 buffer++;
2633 avail_len--;
2634 cp0[head->w.avail++] = c;
2635 if (c != '\n')
2636 continue;
2637 cp0[head->w.avail - 1] = '\0';
2638 head->w.avail = 0;
2639 tomoyo_normalize_line(cp0);
2640 if (!strcmp(cp0, "reset")) {
2641 head->w.ns = &tomoyo_kernel_namespace;
2642 head->w.domain = NULL;
2643 memset(&head->r, 0, sizeof(head->r));
2644 continue;
2645 }
2646 /* Don't allow updating policies by non manager programs. */
2647 switch (head->type) {
2648 case TOMOYO_PROCESS_STATUS:
2649 /* This does not write anything. */
2650 break;
2651 case TOMOYO_DOMAINPOLICY:
2652 if (tomoyo_select_domain(head, cp0))
2653 continue;
2654 /* fall through */
2655 case TOMOYO_EXCEPTIONPOLICY:
2656 if (!strcmp(cp0, "select transition_only")) {
2657 head->r.print_transition_related_only = true;
2658 continue;
2659 }
2660 /* fall through */
2661 default:
2662 if (!tomoyo_manager()) {
2663 error = -EPERM;
2664 goto out;
2665 }
2666 }
2667 switch (tomoyo_parse_policy(head, cp0)) {
2668 case -EPERM:
2669 error = -EPERM;
2670 goto out;
2671 case 0:
2672 switch (head->type) {
2673 case TOMOYO_DOMAINPOLICY:
2674 case TOMOYO_EXCEPTIONPOLICY:
2675 case TOMOYO_STAT:
2676 case TOMOYO_PROFILE:
2677 case TOMOYO_MANAGER:
2678 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2679 break;
2680 default:
2681 break;
2682 }
2683 break;
2684 }
2685 }
2686 out:
2687 tomoyo_read_unlock(idx);
2688 mutex_unlock(&head->io_sem);
2689 return error;
2690 }
2691
2692 /**
2693 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2694 *
2695 * @head: Pointer to "struct tomoyo_io_buffer".
2696 *
2697 * Returns 0.
2698 */
2699 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2700 {
2701 /*
2702 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2703 * observer counter.
2704 */
2705 if (head->type == TOMOYO_QUERY &&
2706 atomic_dec_and_test(&tomoyo_query_observers))
2707 wake_up_all(&tomoyo_answer_wait);
2708 tomoyo_notify_gc(head, false);
2709 return 0;
2710 }
2711
2712 /**
2713 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2714 */
2715 void tomoyo_check_profile(void)
2716 {
2717 struct tomoyo_domain_info *domain;
2718 const int idx = tomoyo_read_lock();
2719 tomoyo_policy_loaded = true;
2720 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2721 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2722 const u8 profile = domain->profile;
2723 const struct tomoyo_policy_namespace *ns = domain->ns;
2724 if (ns->profile_version != 20110903)
2725 printk(KERN_ERR
2726 "Profile version %u is not supported.\n",
2727 ns->profile_version);
2728 else if (!ns->profile_ptr[profile])
2729 printk(KERN_ERR
2730 "Profile %u (used by '%s') is not defined.\n",
2731 profile, domain->domainname->name);
2732 else
2733 continue;
2734 printk(KERN_ERR
2735 "Userland tools for TOMOYO 2.5 must be installed and "
2736 "policy must be initialized.\n");
2737 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2738 "for more information.\n");
2739 panic("STOP!");
2740 }
2741 tomoyo_read_unlock(idx);
2742 printk(KERN_INFO "Mandatory Access Control activated.\n");
2743 }
2744
2745 /**
2746 * tomoyo_load_builtin_policy - Load built-in policy.
2747 *
2748 * Returns nothing.
2749 */
2750 void __init tomoyo_load_builtin_policy(void)
2751 {
2752 /*
2753 * This include file is manually created and contains built-in policy
2754 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2755 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2756 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2757 */
2758 #include "builtin-policy.h"
2759 u8 i;
2760 const int idx = tomoyo_read_lock();
2761 for (i = 0; i < 5; i++) {
2762 struct tomoyo_io_buffer head = { };
2763 char *start = "";
2764 switch (i) {
2765 case 0:
2766 start = tomoyo_builtin_profile;
2767 head.type = TOMOYO_PROFILE;
2768 head.write = tomoyo_write_profile;
2769 break;
2770 case 1:
2771 start = tomoyo_builtin_exception_policy;
2772 head.type = TOMOYO_EXCEPTIONPOLICY;
2773 head.write = tomoyo_write_exception;
2774 break;
2775 case 2:
2776 start = tomoyo_builtin_domain_policy;
2777 head.type = TOMOYO_DOMAINPOLICY;
2778 head.write = tomoyo_write_domain;
2779 break;
2780 case 3:
2781 start = tomoyo_builtin_manager;
2782 head.type = TOMOYO_MANAGER;
2783 head.write = tomoyo_write_manager;
2784 break;
2785 case 4:
2786 start = tomoyo_builtin_stat;
2787 head.type = TOMOYO_STAT;
2788 head.write = tomoyo_write_stat;
2789 break;
2790 }
2791 while (1) {
2792 char *end = strchr(start, '\n');
2793 if (!end)
2794 break;
2795 *end = '\0';
2796 tomoyo_normalize_line(start);
2797 head.write_buf = start;
2798 tomoyo_parse_policy(&head, start);
2799 start = end + 1;
2800 }
2801 }
2802 tomoyo_read_unlock(idx);
2803 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2804 tomoyo_check_profile();
2805 #endif
2806 }
Linus' kernel tree