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Merge branch 'batman-adv/maint' of git://git.open-mesh.org/linux-merge
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / tomoyo / common.c
blob150911c7ff087d4578458c3d89365fbb21ee3e7b
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 /**
970 * tomoyo_select_domain - Parse select command.
971 *
972 * @head: Pointer to "struct tomoyo_io_buffer".
973 * @data: String to parse.
974 *
975 * Returns true on success, false otherwise.
976 *
977 * Caller holds tomoyo_read_lock().
978 */
979 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
980 const char *data)
981 {
982 unsigned int pid;
983 struct tomoyo_domain_info *domain = NULL;
984 bool global_pid = false;
985 if (strncmp(data, "select ", 7))
986 return false;
987 data += 7;
988 if (sscanf(data, "pid=%u", &pid) == 1 ||
989 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
990 struct task_struct *p;
991 rcu_read_lock();
992 if (global_pid)
993 p = find_task_by_pid_ns(pid, &init_pid_ns);
994 else
995 p = find_task_by_vpid(pid);
996 if (p)
997 domain = tomoyo_real_domain(p);
998 rcu_read_unlock();
999 } else if (!strncmp(data, "domain=", 7)) {
1000 if (tomoyo_domain_def(data + 7))
1001 domain = tomoyo_find_domain(data + 7);
1002 } else
1003 return false;
1004 head->w.domain = domain;
1005 /* Accessing read_buf is safe because head->io_sem is held. */
1006 if (!head->read_buf)
1007 return true; /* Do nothing if open(O_WRONLY). */
1008 memset(&head->r, 0, sizeof(head->r));
1009 head->r.print_this_domain_only = true;
1010 if (domain)
1011 head->r.domain = &domain->list;
1012 else
1013 head->r.eof = 1;
1014 tomoyo_io_printf(head, "# select %s\n", data);
1015 if (domain && domain->is_deleted)
1016 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1017 return true;
1018 }
1019
1020 /**
1021 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1022 *
1023 * @a: Pointer to "struct tomoyo_acl_info".
1024 * @b: Pointer to "struct tomoyo_acl_info".
1025 *
1026 * Returns true if @a == @b, false otherwise.
1027 */
1028 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1029 const struct tomoyo_acl_info *b)
1030 {
1031 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1032 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1033 return p1->domainname == p2->domainname;
1034 }
1035
1036 /**
1037 * tomoyo_write_task - Update task related list.
1038 *
1039 * @param: Pointer to "struct tomoyo_acl_param".
1040 *
1041 * Returns 0 on success, negative value otherwise.
1042 *
1043 * Caller holds tomoyo_read_lock().
1044 */
1045 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1046 {
1047 int error = -EINVAL;
1048 if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1049 struct tomoyo_task_acl e = {
1050 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1051 .domainname = tomoyo_get_domainname(param),
1052 };
1053 if (e.domainname)
1054 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1055 tomoyo_same_task_acl,
1056 NULL);
1057 tomoyo_put_name(e.domainname);
1058 }
1059 return error;
1060 }
1061
1062 /**
1063 * tomoyo_delete_domain - Delete a domain.
1064 *
1065 * @domainname: The name of domain.
1066 *
1067 * Returns 0.
1068 *
1069 * Caller holds tomoyo_read_lock().
1070 */
1071 static int tomoyo_delete_domain(char *domainname)
1072 {
1073 struct tomoyo_domain_info *domain;
1074 struct tomoyo_path_info name;
1075
1076 name.name = domainname;
1077 tomoyo_fill_path_info(&name);
1078 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1079 return 0;
1080 /* Is there an active domain? */
1081 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1082 /* Never delete tomoyo_kernel_domain */
1083 if (domain == &tomoyo_kernel_domain)
1084 continue;
1085 if (domain->is_deleted ||
1086 tomoyo_pathcmp(domain->domainname, &name))
1087 continue;
1088 domain->is_deleted = true;
1089 break;
1090 }
1091 mutex_unlock(&tomoyo_policy_lock);
1092 return 0;
1093 }
1094
1095 /**
1096 * tomoyo_write_domain2 - Write domain policy.
1097 *
1098 * @ns: Pointer to "struct tomoyo_policy_namespace".
1099 * @list: Pointer to "struct list_head".
1100 * @data: Policy to be interpreted.
1101 * @is_delete: True if it is a delete request.
1102 *
1103 * Returns 0 on success, negative value otherwise.
1104 *
1105 * Caller holds tomoyo_read_lock().
1106 */
1107 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1108 struct list_head *list, char *data,
1109 const bool is_delete)
1110 {
1111 struct tomoyo_acl_param param = {
1112 .ns = ns,
1113 .list = list,
1114 .data = data,
1115 .is_delete = is_delete,
1116 };
1117 static const struct {
1118 const char *keyword;
1119 int (*write) (struct tomoyo_acl_param *);
1120 } tomoyo_callback[5] = {
1121 { "file ", tomoyo_write_file },
1122 { "network inet ", tomoyo_write_inet_network },
1123 { "network unix ", tomoyo_write_unix_network },
1124 { "misc ", tomoyo_write_misc },
1125 { "task ", tomoyo_write_task },
1126 };
1127 u8 i;
1128
1129 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1130 if (!tomoyo_str_starts(&param.data,
1131 tomoyo_callback[i].keyword))
1132 continue;
1133 return tomoyo_callback[i].write(&param);
1134 }
1135 return -EINVAL;
1136 }
1137
1138 /* String table for domain flags. */
1139 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1140 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1141 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1142 };
1143
1144 /**
1145 * tomoyo_write_domain - Write domain policy.
1146 *
1147 * @head: Pointer to "struct tomoyo_io_buffer".
1148 *
1149 * Returns 0 on success, negative value otherwise.
1150 *
1151 * Caller holds tomoyo_read_lock().
1152 */
1153 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1154 {
1155 char *data = head->write_buf;
1156 struct tomoyo_policy_namespace *ns;
1157 struct tomoyo_domain_info *domain = head->w.domain;
1158 const bool is_delete = head->w.is_delete;
1159 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1160 unsigned int profile;
1161 if (*data == '<') {
1162 domain = NULL;
1163 if (is_delete)
1164 tomoyo_delete_domain(data);
1165 else if (is_select)
1166 domain = tomoyo_find_domain(data);
1167 else
1168 domain = tomoyo_assign_domain(data, false);
1169 head->w.domain = domain;
1170 return 0;
1171 }
1172 if (!domain)
1173 return -EINVAL;
1174 ns = domain->ns;
1175 if (sscanf(data, "use_profile %u", &profile) == 1
1176 && profile < TOMOYO_MAX_PROFILES) {
1177 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1178 domain->profile = (u8) profile;
1179 return 0;
1180 }
1181 if (sscanf(data, "use_group %u\n", &profile) == 1
1182 && profile < TOMOYO_MAX_ACL_GROUPS) {
1183 if (!is_delete)
1184 domain->group = (u8) profile;
1185 return 0;
1186 }
1187 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1188 const char *cp = tomoyo_dif[profile];
1189 if (strncmp(data, cp, strlen(cp) - 1))
1190 continue;
1191 domain->flags[profile] = !is_delete;
1192 return 0;
1193 }
1194 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1195 is_delete);
1196 }
1197
1198 /**
1199 * tomoyo_print_condition - Print condition part.
1200 *
1201 * @head: Pointer to "struct tomoyo_io_buffer".
1202 * @cond: Pointer to "struct tomoyo_condition".
1203 *
1204 * Returns true on success, false otherwise.
1205 */
1206 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1207 const struct tomoyo_condition *cond)
1208 {
1209 switch (head->r.cond_step) {
1210 case 0:
1211 head->r.cond_index = 0;
1212 head->r.cond_step++;
1213 if (cond->transit) {
1214 tomoyo_set_space(head);
1215 tomoyo_set_string(head, cond->transit->name);
1216 }
1217 /* fall through */
1218 case 1:
1219 {
1220 const u16 condc = cond->condc;
1221 const struct tomoyo_condition_element *condp =
1222 (typeof(condp)) (cond + 1);
1223 const struct tomoyo_number_union *numbers_p =
1224 (typeof(numbers_p)) (condp + condc);
1225 const struct tomoyo_name_union *names_p =
1226 (typeof(names_p))
1227 (numbers_p + cond->numbers_count);
1228 const struct tomoyo_argv *argv =
1229 (typeof(argv)) (names_p + cond->names_count);
1230 const struct tomoyo_envp *envp =
1231 (typeof(envp)) (argv + cond->argc);
1232 u16 skip;
1233 for (skip = 0; skip < head->r.cond_index; skip++) {
1234 const u8 left = condp->left;
1235 const u8 right = condp->right;
1236 condp++;
1237 switch (left) {
1238 case TOMOYO_ARGV_ENTRY:
1239 argv++;
1240 continue;
1241 case TOMOYO_ENVP_ENTRY:
1242 envp++;
1243 continue;
1244 case TOMOYO_NUMBER_UNION:
1245 numbers_p++;
1246 break;
1247 }
1248 switch (right) {
1249 case TOMOYO_NAME_UNION:
1250 names_p++;
1251 break;
1252 case TOMOYO_NUMBER_UNION:
1253 numbers_p++;
1254 break;
1255 }
1256 }
1257 while (head->r.cond_index < condc) {
1258 const u8 match = condp->equals;
1259 const u8 left = condp->left;
1260 const u8 right = condp->right;
1261 if (!tomoyo_flush(head))
1262 return false;
1263 condp++;
1264 head->r.cond_index++;
1265 tomoyo_set_space(head);
1266 switch (left) {
1267 case TOMOYO_ARGV_ENTRY:
1268 tomoyo_io_printf(head,
1269 "exec.argv[%lu]%s=\"",
1270 argv->index, argv->
1271 is_not ? "!" : "");
1272 tomoyo_set_string(head,
1273 argv->value->name);
1274 tomoyo_set_string(head, "\"");
1275 argv++;
1276 continue;
1277 case TOMOYO_ENVP_ENTRY:
1278 tomoyo_set_string(head,
1279 "exec.envp[\"");
1280 tomoyo_set_string(head,
1281 envp->name->name);
1282 tomoyo_io_printf(head, "\"]%s=", envp->
1283 is_not ? "!" : "");
1284 if (envp->value) {
1285 tomoyo_set_string(head, "\"");
1286 tomoyo_set_string(head, envp->
1287 value->name);
1288 tomoyo_set_string(head, "\"");
1289 } else {
1290 tomoyo_set_string(head,
1291 "NULL");
1292 }
1293 envp++;
1294 continue;
1295 case TOMOYO_NUMBER_UNION:
1296 tomoyo_print_number_union_nospace
1297 (head, numbers_p++);
1298 break;
1299 default:
1300 tomoyo_set_string(head,
1301 tomoyo_condition_keyword[left]);
1302 break;
1303 }
1304 tomoyo_set_string(head, match ? "=" : "!=");
1305 switch (right) {
1306 case TOMOYO_NAME_UNION:
1307 tomoyo_print_name_union_quoted
1308 (head, names_p++);
1309 break;
1310 case TOMOYO_NUMBER_UNION:
1311 tomoyo_print_number_union_nospace
1312 (head, numbers_p++);
1313 break;
1314 default:
1315 tomoyo_set_string(head,
1316 tomoyo_condition_keyword[right]);
1317 break;
1318 }
1319 }
1320 }
1321 head->r.cond_step++;
1322 /* fall through */
1323 case 2:
1324 if (!tomoyo_flush(head))
1325 break;
1326 head->r.cond_step++;
1327 /* fall through */
1328 case 3:
1329 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1330 tomoyo_io_printf(head, " grant_log=%s",
1331 tomoyo_yesno(cond->grant_log ==
1332 TOMOYO_GRANTLOG_YES));
1333 tomoyo_set_lf(head);
1334 return true;
1335 }
1336 return false;
1337 }
1338
1339 /**
1340 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1341 *
1342 * @head: Pointer to "struct tomoyo_io_buffer".
1343 * @category: Category name.
1344 *
1345 * Returns nothing.
1346 */
1347 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1348 const char *category)
1349 {
1350 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1351 tomoyo_print_namespace(head);
1352 tomoyo_io_printf(head, "acl_group %u ",
1353 head->r.acl_group_index);
1354 }
1355 tomoyo_set_string(head, category);
1356 }
1357
1358 /**
1359 * tomoyo_print_entry - Print an ACL entry.
1360 *
1361 * @head: Pointer to "struct tomoyo_io_buffer".
1362 * @acl: Pointer to an ACL entry.
1363 *
1364 * Returns true on success, false otherwise.
1365 */
1366 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1367 struct tomoyo_acl_info *acl)
1368 {
1369 const u8 acl_type = acl->type;
1370 bool first = true;
1371 u8 bit;
1372
1373 if (head->r.print_cond_part)
1374 goto print_cond_part;
1375 if (acl->is_deleted)
1376 return true;
1377 if (!tomoyo_flush(head))
1378 return false;
1379 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1380 struct tomoyo_path_acl *ptr =
1381 container_of(acl, typeof(*ptr), head);
1382 const u16 perm = ptr->perm;
1383 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1384 if (!(perm & (1 << bit)))
1385 continue;
1386 if (head->r.print_transition_related_only &&
1387 bit != TOMOYO_TYPE_EXECUTE)
1388 continue;
1389 if (first) {
1390 tomoyo_set_group(head, "file ");
1391 first = false;
1392 } else {
1393 tomoyo_set_slash(head);
1394 }
1395 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1396 }
1397 if (first)
1398 return true;
1399 tomoyo_print_name_union(head, &ptr->name);
1400 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1401 struct tomoyo_task_acl *ptr =
1402 container_of(acl, typeof(*ptr), head);
1403 tomoyo_set_group(head, "task ");
1404 tomoyo_set_string(head, "manual_domain_transition ");
1405 tomoyo_set_string(head, ptr->domainname->name);
1406 } else if (head->r.print_transition_related_only) {
1407 return true;
1408 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1409 struct tomoyo_path2_acl *ptr =
1410 container_of(acl, typeof(*ptr), head);
1411 const u8 perm = ptr->perm;
1412 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1413 if (!(perm & (1 << bit)))
1414 continue;
1415 if (first) {
1416 tomoyo_set_group(head, "file ");
1417 first = false;
1418 } else {
1419 tomoyo_set_slash(head);
1420 }
1421 tomoyo_set_string(head, tomoyo_mac_keywords
1422 [tomoyo_pp2mac[bit]]);
1423 }
1424 if (first)
1425 return true;
1426 tomoyo_print_name_union(head, &ptr->name1);
1427 tomoyo_print_name_union(head, &ptr->name2);
1428 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1429 struct tomoyo_path_number_acl *ptr =
1430 container_of(acl, typeof(*ptr), head);
1431 const u8 perm = ptr->perm;
1432 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1433 if (!(perm & (1 << bit)))
1434 continue;
1435 if (first) {
1436 tomoyo_set_group(head, "file ");
1437 first = false;
1438 } else {
1439 tomoyo_set_slash(head);
1440 }
1441 tomoyo_set_string(head, tomoyo_mac_keywords
1442 [tomoyo_pn2mac[bit]]);
1443 }
1444 if (first)
1445 return true;
1446 tomoyo_print_name_union(head, &ptr->name);
1447 tomoyo_print_number_union(head, &ptr->number);
1448 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1449 struct tomoyo_mkdev_acl *ptr =
1450 container_of(acl, typeof(*ptr), head);
1451 const u8 perm = ptr->perm;
1452 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1453 if (!(perm & (1 << bit)))
1454 continue;
1455 if (first) {
1456 tomoyo_set_group(head, "file ");
1457 first = false;
1458 } else {
1459 tomoyo_set_slash(head);
1460 }
1461 tomoyo_set_string(head, tomoyo_mac_keywords
1462 [tomoyo_pnnn2mac[bit]]);
1463 }
1464 if (first)
1465 return true;
1466 tomoyo_print_name_union(head, &ptr->name);
1467 tomoyo_print_number_union(head, &ptr->mode);
1468 tomoyo_print_number_union(head, &ptr->major);
1469 tomoyo_print_number_union(head, &ptr->minor);
1470 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1471 struct tomoyo_inet_acl *ptr =
1472 container_of(acl, typeof(*ptr), head);
1473 const u8 perm = ptr->perm;
1474
1475 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1476 if (!(perm & (1 << bit)))
1477 continue;
1478 if (first) {
1479 tomoyo_set_group(head, "network inet ");
1480 tomoyo_set_string(head, tomoyo_proto_keyword
1481 [ptr->protocol]);
1482 tomoyo_set_space(head);
1483 first = false;
1484 } else {
1485 tomoyo_set_slash(head);
1486 }
1487 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1488 }
1489 if (first)
1490 return true;
1491 tomoyo_set_space(head);
1492 if (ptr->address.group) {
1493 tomoyo_set_string(head, "@");
1494 tomoyo_set_string(head, ptr->address.group->group_name
1495 ->name);
1496 } else {
1497 char buf[128];
1498 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1499 tomoyo_io_printf(head, "%s", buf);
1500 }
1501 tomoyo_print_number_union(head, &ptr->port);
1502 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1503 struct tomoyo_unix_acl *ptr =
1504 container_of(acl, typeof(*ptr), head);
1505 const u8 perm = ptr->perm;
1506
1507 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1508 if (!(perm & (1 << bit)))
1509 continue;
1510 if (first) {
1511 tomoyo_set_group(head, "network unix ");
1512 tomoyo_set_string(head, tomoyo_proto_keyword
1513 [ptr->protocol]);
1514 tomoyo_set_space(head);
1515 first = false;
1516 } else {
1517 tomoyo_set_slash(head);
1518 }
1519 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1520 }
1521 if (first)
1522 return true;
1523 tomoyo_print_name_union(head, &ptr->name);
1524 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1525 struct tomoyo_mount_acl *ptr =
1526 container_of(acl, typeof(*ptr), head);
1527 tomoyo_set_group(head, "file mount");
1528 tomoyo_print_name_union(head, &ptr->dev_name);
1529 tomoyo_print_name_union(head, &ptr->dir_name);
1530 tomoyo_print_name_union(head, &ptr->fs_type);
1531 tomoyo_print_number_union(head, &ptr->flags);
1532 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1533 struct tomoyo_env_acl *ptr =
1534 container_of(acl, typeof(*ptr), head);
1535
1536 tomoyo_set_group(head, "misc env ");
1537 tomoyo_set_string(head, ptr->env->name);
1538 }
1539 if (acl->cond) {
1540 head->r.print_cond_part = true;
1541 head->r.cond_step = 0;
1542 if (!tomoyo_flush(head))
1543 return false;
1544 print_cond_part:
1545 if (!tomoyo_print_condition(head, acl->cond))
1546 return false;
1547 head->r.print_cond_part = false;
1548 } else {
1549 tomoyo_set_lf(head);
1550 }
1551 return true;
1552 }
1553
1554 /**
1555 * tomoyo_read_domain2 - Read domain policy.
1556 *
1557 * @head: Pointer to "struct tomoyo_io_buffer".
1558 * @list: Pointer to "struct list_head".
1559 *
1560 * Caller holds tomoyo_read_lock().
1561 *
1562 * Returns true on success, false otherwise.
1563 */
1564 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1565 struct list_head *list)
1566 {
1567 list_for_each_cookie(head->r.acl, list) {
1568 struct tomoyo_acl_info *ptr =
1569 list_entry(head->r.acl, typeof(*ptr), list);
1570 if (!tomoyo_print_entry(head, ptr))
1571 return false;
1572 }
1573 head->r.acl = NULL;
1574 return true;
1575 }
1576
1577 /**
1578 * tomoyo_read_domain - Read domain policy.
1579 *
1580 * @head: Pointer to "struct tomoyo_io_buffer".
1581 *
1582 * Caller holds tomoyo_read_lock().
1583 */
1584 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1585 {
1586 if (head->r.eof)
1587 return;
1588 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1589 struct tomoyo_domain_info *domain =
1590 list_entry(head->r.domain, typeof(*domain), list);
1591 switch (head->r.step) {
1592 u8 i;
1593 case 0:
1594 if (domain->is_deleted &&
1595 !head->r.print_this_domain_only)
1596 continue;
1597 /* Print domainname and flags. */
1598 tomoyo_set_string(head, domain->domainname->name);
1599 tomoyo_set_lf(head);
1600 tomoyo_io_printf(head, "use_profile %u\n",
1601 domain->profile);
1602 tomoyo_io_printf(head, "use_group %u\n",
1603 domain->group);
1604 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1605 if (domain->flags[i])
1606 tomoyo_set_string(head, tomoyo_dif[i]);
1607 head->r.step++;
1608 tomoyo_set_lf(head);
1609 /* fall through */
1610 case 1:
1611 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1612 return;
1613 head->r.step++;
1614 if (!tomoyo_set_lf(head))
1615 return;
1616 /* fall through */
1617 case 2:
1618 head->r.step = 0;
1619 if (head->r.print_this_domain_only)
1620 goto done;
1621 }
1622 }
1623 done:
1624 head->r.eof = true;
1625 }
1626
1627 /**
1628 * tomoyo_write_pid: Specify PID to obtain domainname.
1629 *
1630 * @head: Pointer to "struct tomoyo_io_buffer".
1631 *
1632 * Returns 0.
1633 */
1634 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1635 {
1636 head->r.eof = false;
1637 return 0;
1638 }
1639
1640 /**
1641 * tomoyo_read_pid - Get domainname of the specified PID.
1642 *
1643 * @head: Pointer to "struct tomoyo_io_buffer".
1644 *
1645 * Returns the domainname which the specified PID is in on success,
1646 * empty string otherwise.
1647 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1648 * using read()/write() interface rather than sysctl() interface.
1649 */
1650 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1651 {
1652 char *buf = head->write_buf;
1653 bool global_pid = false;
1654 unsigned int pid;
1655 struct task_struct *p;
1656 struct tomoyo_domain_info *domain = NULL;
1657
1658 /* Accessing write_buf is safe because head->io_sem is held. */
1659 if (!buf) {
1660 head->r.eof = true;
1661 return; /* Do nothing if open(O_RDONLY). */
1662 }
1663 if (head->r.w_pos || head->r.eof)
1664 return;
1665 head->r.eof = true;
1666 if (tomoyo_str_starts(&buf, "global-pid "))
1667 global_pid = true;
1668 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1669 rcu_read_lock();
1670 if (global_pid)
1671 p = find_task_by_pid_ns(pid, &init_pid_ns);
1672 else
1673 p = find_task_by_vpid(pid);
1674 if (p)
1675 domain = tomoyo_real_domain(p);
1676 rcu_read_unlock();
1677 if (!domain)
1678 return;
1679 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1680 tomoyo_set_string(head, domain->domainname->name);
1681 }
1682
1683 /* String table for domain transition control keywords. */
1684 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1685 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1686 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1687 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1688 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1689 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1690 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1691 };
1692
1693 /* String table for grouping keywords. */
1694 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1695 [TOMOYO_PATH_GROUP] = "path_group ",
1696 [TOMOYO_NUMBER_GROUP] = "number_group ",
1697 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1698 };
1699
1700 /**
1701 * tomoyo_write_exception - Write exception policy.
1702 *
1703 * @head: Pointer to "struct tomoyo_io_buffer".
1704 *
1705 * Returns 0 on success, negative value otherwise.
1706 *
1707 * Caller holds tomoyo_read_lock().
1708 */
1709 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1710 {
1711 const bool is_delete = head->w.is_delete;
1712 struct tomoyo_acl_param param = {
1713 .ns = head->w.ns,
1714 .is_delete = is_delete,
1715 .data = head->write_buf,
1716 };
1717 u8 i;
1718 if (tomoyo_str_starts(&param.data, "aggregator "))
1719 return tomoyo_write_aggregator(&param);
1720 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1721 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1722 return tomoyo_write_transition_control(&param, i);
1723 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1724 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1725 return tomoyo_write_group(&param, i);
1726 if (tomoyo_str_starts(&param.data, "acl_group ")) {
1727 unsigned int group;
1728 char *data;
1729 group = simple_strtoul(param.data, &data, 10);
1730 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1731 return tomoyo_write_domain2
1732 (head->w.ns, &head->w.ns->acl_group[group],
1733 data, is_delete);
1734 }
1735 return -EINVAL;
1736 }
1737
1738 /**
1739 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1740 *
1741 * @head: Pointer to "struct tomoyo_io_buffer".
1742 * @idx: Index number.
1743 *
1744 * Returns true on success, false otherwise.
1745 *
1746 * Caller holds tomoyo_read_lock().
1747 */
1748 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1749 {
1750 struct tomoyo_policy_namespace *ns =
1751 container_of(head->r.ns, typeof(*ns), namespace_list);
1752 struct list_head *list = &ns->group_list[idx];
1753 list_for_each_cookie(head->r.group, list) {
1754 struct tomoyo_group *group =
1755 list_entry(head->r.group, typeof(*group), head.list);
1756 list_for_each_cookie(head->r.acl, &group->member_list) {
1757 struct tomoyo_acl_head *ptr =
1758 list_entry(head->r.acl, typeof(*ptr), list);
1759 if (ptr->is_deleted)
1760 continue;
1761 if (!tomoyo_flush(head))
1762 return false;
1763 tomoyo_print_namespace(head);
1764 tomoyo_set_string(head, tomoyo_group_name[idx]);
1765 tomoyo_set_string(head, group->group_name->name);
1766 if (idx == TOMOYO_PATH_GROUP) {
1767 tomoyo_set_space(head);
1768 tomoyo_set_string(head, container_of
1769 (ptr, struct tomoyo_path_group,
1770 head)->member_name->name);
1771 } else if (idx == TOMOYO_NUMBER_GROUP) {
1772 tomoyo_print_number_union(head, &container_of
1773 (ptr,
1774 struct tomoyo_number_group,
1775 head)->number);
1776 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1777 char buffer[128];
1778
1779 struct tomoyo_address_group *member =
1780 container_of(ptr, typeof(*member),
1781 head);
1782 tomoyo_print_ip(buffer, sizeof(buffer),
1783 &member->address);
1784 tomoyo_io_printf(head, " %s", buffer);
1785 }
1786 tomoyo_set_lf(head);
1787 }
1788 head->r.acl = NULL;
1789 }
1790 head->r.group = NULL;
1791 return true;
1792 }
1793
1794 /**
1795 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1796 *
1797 * @head: Pointer to "struct tomoyo_io_buffer".
1798 * @idx: Index number.
1799 *
1800 * Returns true on success, false otherwise.
1801 *
1802 * Caller holds tomoyo_read_lock().
1803 */
1804 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1805 {
1806 struct tomoyo_policy_namespace *ns =
1807 container_of(head->r.ns, typeof(*ns), namespace_list);
1808 struct list_head *list = &ns->policy_list[idx];
1809 list_for_each_cookie(head->r.acl, list) {
1810 struct tomoyo_acl_head *acl =
1811 container_of(head->r.acl, typeof(*acl), list);
1812 if (acl->is_deleted)
1813 continue;
1814 if (!tomoyo_flush(head))
1815 return false;
1816 switch (idx) {
1817 case TOMOYO_ID_TRANSITION_CONTROL:
1818 {
1819 struct tomoyo_transition_control *ptr =
1820 container_of(acl, typeof(*ptr), head);
1821 tomoyo_print_namespace(head);
1822 tomoyo_set_string(head, tomoyo_transition_type
1823 [ptr->type]);
1824 tomoyo_set_string(head, ptr->program ?
1825 ptr->program->name : "any");
1826 tomoyo_set_string(head, " from ");
1827 tomoyo_set_string(head, ptr->domainname ?
1828 ptr->domainname->name :
1829 "any");
1830 }
1831 break;
1832 case TOMOYO_ID_AGGREGATOR:
1833 {
1834 struct tomoyo_aggregator *ptr =
1835 container_of(acl, typeof(*ptr), head);
1836 tomoyo_print_namespace(head);
1837 tomoyo_set_string(head, "aggregator ");
1838 tomoyo_set_string(head,
1839 ptr->original_name->name);
1840 tomoyo_set_space(head);
1841 tomoyo_set_string(head,
1842 ptr->aggregated_name->name);
1843 }
1844 break;
1845 default:
1846 continue;
1847 }
1848 tomoyo_set_lf(head);
1849 }
1850 head->r.acl = NULL;
1851 return true;
1852 }
1853
1854 /**
1855 * tomoyo_read_exception - Read exception policy.
1856 *
1857 * @head: Pointer to "struct tomoyo_io_buffer".
1858 *
1859 * Caller holds tomoyo_read_lock().
1860 */
1861 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1862 {
1863 struct tomoyo_policy_namespace *ns =
1864 container_of(head->r.ns, typeof(*ns), namespace_list);
1865 if (head->r.eof)
1866 return;
1867 while (head->r.step < TOMOYO_MAX_POLICY &&
1868 tomoyo_read_policy(head, head->r.step))
1869 head->r.step++;
1870 if (head->r.step < TOMOYO_MAX_POLICY)
1871 return;
1872 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1873 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1874 head->r.step++;
1875 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1876 return;
1877 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1878 + TOMOYO_MAX_ACL_GROUPS) {
1879 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1880 - TOMOYO_MAX_GROUP;
1881 if (!tomoyo_read_domain2(head, &ns->acl_group
1882 [head->r.acl_group_index]))
1883 return;
1884 head->r.step++;
1885 }
1886 head->r.eof = true;
1887 }
1888
1889 /* Wait queue for kernel -> userspace notification. */
1890 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1891 /* Wait queue for userspace -> kernel notification. */
1892 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1893
1894 /* Structure for query. */
1895 struct tomoyo_query {
1896 struct list_head list;
1897 char *query;
1898 size_t query_len;
1899 unsigned int serial;
1900 u8 timer;
1901 u8 answer;
1902 u8 retry;
1903 };
1904
1905 /* The list for "struct tomoyo_query". */
1906 static LIST_HEAD(tomoyo_query_list);
1907
1908 /* Lock for manipulating tomoyo_query_list. */
1909 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1910
1911 /*
1912 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1913 * interface.
1914 */
1915 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1916
1917 /**
1918 * tomoyo_truncate - Truncate a line.
1919 *
1920 * @str: String to truncate.
1921 *
1922 * Returns length of truncated @str.
1923 */
1924 static int tomoyo_truncate(char *str)
1925 {
1926 char *start = str;
1927 while (*(unsigned char *) str > (unsigned char) ' ')
1928 str++;
1929 *str = '\0';
1930 return strlen(start) + 1;
1931 }
1932
1933 /**
1934 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1935 *
1936 * @domain: Pointer to "struct tomoyo_domain_info".
1937 * @header: Lines containing ACL.
1938 *
1939 * Returns nothing.
1940 */
1941 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1942 {
1943 char *buffer;
1944 char *realpath = NULL;
1945 char *argv0 = NULL;
1946 char *symlink = NULL;
1947 char *cp = strchr(header, '\n');
1948 int len;
1949 if (!cp)
1950 return;
1951 cp = strchr(cp + 1, '\n');
1952 if (!cp)
1953 return;
1954 *cp++ = '\0';
1955 len = strlen(cp) + 1;
1956 /* strstr() will return NULL if ordering is wrong. */
1957 if (*cp == 'f') {
1958 argv0 = strstr(header, " argv[]={ \"");
1959 if (argv0) {
1960 argv0 += 10;
1961 len += tomoyo_truncate(argv0) + 14;
1962 }
1963 realpath = strstr(header, " exec={ realpath=\"");
1964 if (realpath) {
1965 realpath += 8;
1966 len += tomoyo_truncate(realpath) + 6;
1967 }
1968 symlink = strstr(header, " symlink.target=\"");
1969 if (symlink)
1970 len += tomoyo_truncate(symlink + 1) + 1;
1971 }
1972 buffer = kmalloc(len, GFP_NOFS);
1973 if (!buffer)
1974 return;
1975 snprintf(buffer, len - 1, "%s", cp);
1976 if (realpath)
1977 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1978 if (argv0)
1979 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1980 if (symlink)
1981 tomoyo_addprintf(buffer, len, "%s", symlink);
1982 tomoyo_normalize_line(buffer);
1983 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1984 false))
1985 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1986 kfree(buffer);
1987 }
1988
1989 /**
1990 * tomoyo_supervisor - Ask for the supervisor's decision.
1991 *
1992 * @r: Pointer to "struct tomoyo_request_info".
1993 * @fmt: The printf()'s format string, followed by parameters.
1994 *
1995 * Returns 0 if the supervisor decided to permit the access request which
1996 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1997 * supervisor decided to retry the access request which violated the policy in
1998 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1999 */
2000 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2001 {
2002 va_list args;
2003 int error;
2004 int len;
2005 static unsigned int tomoyo_serial;
2006 struct tomoyo_query entry = { };
2007 bool quota_exceeded = false;
2008 va_start(args, fmt);
2009 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2010 va_end(args);
2011 /* Write /sys/kernel/security/tomoyo/audit. */
2012 va_start(args, fmt);
2013 tomoyo_write_log2(r, len, fmt, args);
2014 va_end(args);
2015 /* Nothing more to do if granted. */
2016 if (r->granted)
2017 return 0;
2018 if (r->mode)
2019 tomoyo_update_stat(r->mode);
2020 switch (r->mode) {
2021 case TOMOYO_CONFIG_ENFORCING:
2022 error = -EPERM;
2023 if (atomic_read(&tomoyo_query_observers))
2024 break;
2025 goto out;
2026 case TOMOYO_CONFIG_LEARNING:
2027 error = 0;
2028 /* Check max_learning_entry parameter. */
2029 if (tomoyo_domain_quota_is_ok(r))
2030 break;
2031 /* fall through */
2032 default:
2033 return 0;
2034 }
2035 /* Get message. */
2036 va_start(args, fmt);
2037 entry.query = tomoyo_init_log(r, len, fmt, args);
2038 va_end(args);
2039 if (!entry.query)
2040 goto out;
2041 entry.query_len = strlen(entry.query) + 1;
2042 if (!error) {
2043 tomoyo_add_entry(r->domain, entry.query);
2044 goto out;
2045 }
2046 len = tomoyo_round2(entry.query_len);
2047 spin_lock(&tomoyo_query_list_lock);
2048 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2049 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2050 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2051 quota_exceeded = true;
2052 } else {
2053 entry.serial = tomoyo_serial++;
2054 entry.retry = r->retry;
2055 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2056 list_add_tail(&entry.list, &tomoyo_query_list);
2057 }
2058 spin_unlock(&tomoyo_query_list_lock);
2059 if (quota_exceeded)
2060 goto out;
2061 /* Give 10 seconds for supervisor's opinion. */
2062 while (entry.timer < 10) {
2063 wake_up_all(&tomoyo_query_wait);
2064 if (wait_event_interruptible_timeout
2065 (tomoyo_answer_wait, entry.answer ||
2066 !atomic_read(&tomoyo_query_observers), HZ))
2067 break;
2068 else
2069 entry.timer++;
2070 }
2071 spin_lock(&tomoyo_query_list_lock);
2072 list_del(&entry.list);
2073 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2074 spin_unlock(&tomoyo_query_list_lock);
2075 switch (entry.answer) {
2076 case 3: /* Asked to retry by administrator. */
2077 error = TOMOYO_RETRY_REQUEST;
2078 r->retry++;
2079 break;
2080 case 1:
2081 /* Granted by administrator. */
2082 error = 0;
2083 break;
2084 default:
2085 /* Timed out or rejected by administrator. */
2086 break;
2087 }
2088 out:
2089 kfree(entry.query);
2090 return error;
2091 }
2092
2093 /**
2094 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2095 *
2096 * @file: Pointer to "struct file".
2097 * @wait: Pointer to "poll_table".
2098 *
2099 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2100 *
2101 * Waits for access requests which violated policy in enforcing mode.
2102 */
2103 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2104 {
2105 struct list_head *tmp;
2106 bool found = false;
2107 u8 i;
2108 for (i = 0; i < 2; i++) {
2109 spin_lock(&tomoyo_query_list_lock);
2110 list_for_each(tmp, &tomoyo_query_list) {
2111 struct tomoyo_query *ptr =
2112 list_entry(tmp, typeof(*ptr), list);
2113 if (ptr->answer)
2114 continue;
2115 found = true;
2116 break;
2117 }
2118 spin_unlock(&tomoyo_query_list_lock);
2119 if (found)
2120 return POLLIN | POLLRDNORM;
2121 if (i)
2122 break;
2123 poll_wait(file, &tomoyo_query_wait, wait);
2124 }
2125 return 0;
2126 }
2127
2128 /**
2129 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2130 *
2131 * @head: Pointer to "struct tomoyo_io_buffer".
2132 */
2133 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2134 {
2135 struct list_head *tmp;
2136 unsigned int pos = 0;
2137 size_t len = 0;
2138 char *buf;
2139 if (head->r.w_pos)
2140 return;
2141 if (head->read_buf) {
2142 kfree(head->read_buf);
2143 head->read_buf = NULL;
2144 }
2145 spin_lock(&tomoyo_query_list_lock);
2146 list_for_each(tmp, &tomoyo_query_list) {
2147 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2148 if (ptr->answer)
2149 continue;
2150 if (pos++ != head->r.query_index)
2151 continue;
2152 len = ptr->query_len;
2153 break;
2154 }
2155 spin_unlock(&tomoyo_query_list_lock);
2156 if (!len) {
2157 head->r.query_index = 0;
2158 return;
2159 }
2160 buf = kzalloc(len + 32, GFP_NOFS);
2161 if (!buf)
2162 return;
2163 pos = 0;
2164 spin_lock(&tomoyo_query_list_lock);
2165 list_for_each(tmp, &tomoyo_query_list) {
2166 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2167 if (ptr->answer)
2168 continue;
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 */
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 if (!ptr->answer)
2217 ptr->answer = answer;
2218 break;
2219 }
2220 spin_unlock(&tomoyo_query_list_lock);
2221 return 0;
2222 }
2223
2224 /**
2225 * tomoyo_read_version: Get version.
2226 *
2227 * @head: Pointer to "struct tomoyo_io_buffer".
2228 *
2229 * Returns version information.
2230 */
2231 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2232 {
2233 if (!head->r.eof) {
2234 tomoyo_io_printf(head, "2.5.0");
2235 head->r.eof = true;
2236 }
2237 }
2238
2239 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2240 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2241 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2242 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2243 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2244 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2245 };
2246
2247 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2248 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2249 [TOMOYO_MEMORY_POLICY] = "policy:",
2250 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2251 [TOMOYO_MEMORY_QUERY] = "query message:",
2252 };
2253
2254 /* Timestamp counter for last updated. */
2255 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2256 /* Counter for number of updates. */
2257 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2258
2259 /**
2260 * tomoyo_update_stat - Update statistic counters.
2261 *
2262 * @index: Index for policy type.
2263 *
2264 * Returns nothing.
2265 */
2266 void tomoyo_update_stat(const u8 index)
2267 {
2268 struct timeval tv;
2269 do_gettimeofday(&tv);
2270 /*
2271 * I don't use atomic operations because race condition is not fatal.
2272 */
2273 tomoyo_stat_updated[index]++;
2274 tomoyo_stat_modified[index] = tv.tv_sec;
2275 }
2276
2277 /**
2278 * tomoyo_read_stat - Read statistic data.
2279 *
2280 * @head: Pointer to "struct tomoyo_io_buffer".
2281 *
2282 * Returns nothing.
2283 */
2284 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2285 {
2286 u8 i;
2287 unsigned int total = 0;
2288 if (head->r.eof)
2289 return;
2290 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2291 tomoyo_io_printf(head, "Policy %-30s %10u",
2292 tomoyo_policy_headers[i],
2293 tomoyo_stat_updated[i]);
2294 if (tomoyo_stat_modified[i]) {
2295 struct tomoyo_time stamp;
2296 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2297 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2298 "%02u:%02u:%02u)",
2299 stamp.year, stamp.month, stamp.day,
2300 stamp.hour, stamp.min, stamp.sec);
2301 }
2302 tomoyo_set_lf(head);
2303 }
2304 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2305 unsigned int used = tomoyo_memory_used[i];
2306 total += used;
2307 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2308 tomoyo_memory_headers[i], used);
2309 used = tomoyo_memory_quota[i];
2310 if (used)
2311 tomoyo_io_printf(head, " (Quota: %10u)", used);
2312 tomoyo_set_lf(head);
2313 }
2314 tomoyo_io_printf(head, "Total memory used: %10u\n",
2315 total);
2316 head->r.eof = true;
2317 }
2318
2319 /**
2320 * tomoyo_write_stat - Set memory quota.
2321 *
2322 * @head: Pointer to "struct tomoyo_io_buffer".
2323 *
2324 * Returns 0.
2325 */
2326 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2327 {
2328 char *data = head->write_buf;
2329 u8 i;
2330 if (tomoyo_str_starts(&data, "Memory used by "))
2331 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2332 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2333 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2334 return 0;
2335 }
2336
2337 /**
2338 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2339 *
2340 * @type: Type of interface.
2341 * @file: Pointer to "struct file".
2342 *
2343 * Returns 0 on success, negative value otherwise.
2344 */
2345 int tomoyo_open_control(const u8 type, struct file *file)
2346 {
2347 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2348
2349 if (!head)
2350 return -ENOMEM;
2351 mutex_init(&head->io_sem);
2352 head->type = type;
2353 switch (type) {
2354 case TOMOYO_DOMAINPOLICY:
2355 /* /sys/kernel/security/tomoyo/domain_policy */
2356 head->write = tomoyo_write_domain;
2357 head->read = tomoyo_read_domain;
2358 break;
2359 case TOMOYO_EXCEPTIONPOLICY:
2360 /* /sys/kernel/security/tomoyo/exception_policy */
2361 head->write = tomoyo_write_exception;
2362 head->read = tomoyo_read_exception;
2363 break;
2364 case TOMOYO_AUDIT:
2365 /* /sys/kernel/security/tomoyo/audit */
2366 head->poll = tomoyo_poll_log;
2367 head->read = tomoyo_read_log;
2368 break;
2369 case TOMOYO_PROCESS_STATUS:
2370 /* /sys/kernel/security/tomoyo/.process_status */
2371 head->write = tomoyo_write_pid;
2372 head->read = tomoyo_read_pid;
2373 break;
2374 case TOMOYO_VERSION:
2375 /* /sys/kernel/security/tomoyo/version */
2376 head->read = tomoyo_read_version;
2377 head->readbuf_size = 128;
2378 break;
2379 case TOMOYO_STAT:
2380 /* /sys/kernel/security/tomoyo/stat */
2381 head->write = tomoyo_write_stat;
2382 head->read = tomoyo_read_stat;
2383 head->readbuf_size = 1024;
2384 break;
2385 case TOMOYO_PROFILE:
2386 /* /sys/kernel/security/tomoyo/profile */
2387 head->write = tomoyo_write_profile;
2388 head->read = tomoyo_read_profile;
2389 break;
2390 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2391 head->poll = tomoyo_poll_query;
2392 head->write = tomoyo_write_answer;
2393 head->read = tomoyo_read_query;
2394 break;
2395 case TOMOYO_MANAGER:
2396 /* /sys/kernel/security/tomoyo/manager */
2397 head->write = tomoyo_write_manager;
2398 head->read = tomoyo_read_manager;
2399 break;
2400 }
2401 if (!(file->f_mode & FMODE_READ)) {
2402 /*
2403 * No need to allocate read_buf since it is not opened
2404 * for reading.
2405 */
2406 head->read = NULL;
2407 head->poll = NULL;
2408 } else if (!head->poll) {
2409 /* Don't allocate read_buf for poll() access. */
2410 if (!head->readbuf_size)
2411 head->readbuf_size = 4096 * 2;
2412 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2413 if (!head->read_buf) {
2414 kfree(head);
2415 return -ENOMEM;
2416 }
2417 }
2418 if (!(file->f_mode & FMODE_WRITE)) {
2419 /*
2420 * No need to allocate write_buf since it is not opened
2421 * for writing.
2422 */
2423 head->write = NULL;
2424 } else if (head->write) {
2425 head->writebuf_size = 4096 * 2;
2426 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2427 if (!head->write_buf) {
2428 kfree(head->read_buf);
2429 kfree(head);
2430 return -ENOMEM;
2431 }
2432 }
2433 /*
2434 * If the file is /sys/kernel/security/tomoyo/query , increment the
2435 * observer counter.
2436 * The obserber counter is used by tomoyo_supervisor() to see if
2437 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2438 */
2439 if (type == TOMOYO_QUERY)
2440 atomic_inc(&tomoyo_query_observers);
2441 file->private_data = head;
2442 tomoyo_notify_gc(head, true);
2443 return 0;
2444 }
2445
2446 /**
2447 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2448 *
2449 * @file: Pointer to "struct file".
2450 * @wait: Pointer to "poll_table".
2451 *
2452 * Waits for read readiness.
2453 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2454 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2455 */
2456 int tomoyo_poll_control(struct file *file, poll_table *wait)
2457 {
2458 struct tomoyo_io_buffer *head = file->private_data;
2459 if (!head->poll)
2460 return -ENOSYS;
2461 return head->poll(file, wait);
2462 }
2463
2464 /**
2465 * tomoyo_set_namespace_cursor - Set namespace to read.
2466 *
2467 * @head: Pointer to "struct tomoyo_io_buffer".
2468 *
2469 * Returns nothing.
2470 */
2471 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2472 {
2473 struct list_head *ns;
2474 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2475 head->type != TOMOYO_PROFILE)
2476 return;
2477 /*
2478 * If this is the first read, or reading previous namespace finished
2479 * and has more namespaces to read, update the namespace cursor.
2480 */
2481 ns = head->r.ns;
2482 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2483 /* Clearing is OK because tomoyo_flush() returned true. */
2484 memset(&head->r, 0, sizeof(head->r));
2485 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2486 }
2487 }
2488
2489 /**
2490 * tomoyo_has_more_namespace - Check for unread namespaces.
2491 *
2492 * @head: Pointer to "struct tomoyo_io_buffer".
2493 *
2494 * Returns true if we have more entries to print, false otherwise.
2495 */
2496 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2497 {
2498 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2499 head->type == TOMOYO_PROFILE) && head->r.eof &&
2500 head->r.ns->next != &tomoyo_namespace_list;
2501 }
2502
2503 /**
2504 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2505 *
2506 * @head: Pointer to "struct tomoyo_io_buffer".
2507 * @buffer: Poiner to buffer to write to.
2508 * @buffer_len: Size of @buffer.
2509 *
2510 * Returns bytes read on success, negative value otherwise.
2511 */
2512 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2513 const int buffer_len)
2514 {
2515 int len;
2516 int idx;
2517
2518 if (!head->read)
2519 return -ENOSYS;
2520 if (mutex_lock_interruptible(&head->io_sem))
2521 return -EINTR;
2522 head->read_user_buf = buffer;
2523 head->read_user_buf_avail = buffer_len;
2524 idx = tomoyo_read_lock();
2525 if (tomoyo_flush(head))
2526 /* Call the policy handler. */
2527 do {
2528 tomoyo_set_namespace_cursor(head);
2529 head->read(head);
2530 } while (tomoyo_flush(head) &&
2531 tomoyo_has_more_namespace(head));
2532 tomoyo_read_unlock(idx);
2533 len = head->read_user_buf - buffer;
2534 mutex_unlock(&head->io_sem);
2535 return len;
2536 }
2537
2538 /**
2539 * tomoyo_parse_policy - Parse a policy line.
2540 *
2541 * @head: Poiter to "struct tomoyo_io_buffer".
2542 * @line: Line to parse.
2543 *
2544 * Returns 0 on success, negative value otherwise.
2545 *
2546 * Caller holds tomoyo_read_lock().
2547 */
2548 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2549 {
2550 /* Delete request? */
2551 head->w.is_delete = !strncmp(line, "delete ", 7);
2552 if (head->w.is_delete)
2553 memmove(line, line + 7, strlen(line + 7) + 1);
2554 /* Selecting namespace to update. */
2555 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2556 head->type == TOMOYO_PROFILE) {
2557 if (*line == '<') {
2558 char *cp = strchr(line, ' ');
2559 if (cp) {
2560 *cp++ = '\0';
2561 head->w.ns = tomoyo_assign_namespace(line);
2562 memmove(line, cp, strlen(cp) + 1);
2563 } else
2564 head->w.ns = NULL;
2565 } else
2566 head->w.ns = &tomoyo_kernel_namespace;
2567 /* Don't allow updating if namespace is invalid. */
2568 if (!head->w.ns)
2569 return -ENOENT;
2570 }
2571 /* Do the update. */
2572 return head->write(head);
2573 }
2574
2575 /**
2576 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2577 *
2578 * @head: Pointer to "struct tomoyo_io_buffer".
2579 * @buffer: Pointer to buffer to read from.
2580 * @buffer_len: Size of @buffer.
2581 *
2582 * Returns @buffer_len on success, negative value otherwise.
2583 */
2584 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2585 const char __user *buffer, const int buffer_len)
2586 {
2587 int error = buffer_len;
2588 size_t avail_len = buffer_len;
2589 char *cp0 = head->write_buf;
2590 int idx;
2591 if (!head->write)
2592 return -ENOSYS;
2593 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2594 return -EFAULT;
2595 if (mutex_lock_interruptible(&head->io_sem))
2596 return -EINTR;
2597 head->read_user_buf_avail = 0;
2598 idx = tomoyo_read_lock();
2599 /* Read a line and dispatch it to the policy handler. */
2600 while (avail_len > 0) {
2601 char c;
2602 if (head->w.avail >= head->writebuf_size - 1) {
2603 const int len = head->writebuf_size * 2;
2604 char *cp = kzalloc(len, GFP_NOFS);
2605 if (!cp) {
2606 error = -ENOMEM;
2607 break;
2608 }
2609 memmove(cp, cp0, head->w.avail);
2610 kfree(cp0);
2611 head->write_buf = cp;
2612 cp0 = cp;
2613 head->writebuf_size = len;
2614 }
2615 if (get_user(c, buffer)) {
2616 error = -EFAULT;
2617 break;
2618 }
2619 buffer++;
2620 avail_len--;
2621 cp0[head->w.avail++] = c;
2622 if (c != '\n')
2623 continue;
2624 cp0[head->w.avail - 1] = '\0';
2625 head->w.avail = 0;
2626 tomoyo_normalize_line(cp0);
2627 if (!strcmp(cp0, "reset")) {
2628 head->w.ns = &tomoyo_kernel_namespace;
2629 head->w.domain = NULL;
2630 memset(&head->r, 0, sizeof(head->r));
2631 continue;
2632 }
2633 /* Don't allow updating policies by non manager programs. */
2634 switch (head->type) {
2635 case TOMOYO_PROCESS_STATUS:
2636 /* This does not write anything. */
2637 break;
2638 case TOMOYO_DOMAINPOLICY:
2639 if (tomoyo_select_domain(head, cp0))
2640 continue;
2641 /* fall through */
2642 case TOMOYO_EXCEPTIONPOLICY:
2643 if (!strcmp(cp0, "select transition_only")) {
2644 head->r.print_transition_related_only = true;
2645 continue;
2646 }
2647 /* fall through */
2648 default:
2649 if (!tomoyo_manager()) {
2650 error = -EPERM;
2651 goto out;
2652 }
2653 }
2654 switch (tomoyo_parse_policy(head, cp0)) {
2655 case -EPERM:
2656 error = -EPERM;
2657 goto out;
2658 case 0:
2659 switch (head->type) {
2660 case TOMOYO_DOMAINPOLICY:
2661 case TOMOYO_EXCEPTIONPOLICY:
2662 case TOMOYO_STAT:
2663 case TOMOYO_PROFILE:
2664 case TOMOYO_MANAGER:
2665 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2666 break;
2667 default:
2668 break;
2669 }
2670 break;
2671 }
2672 }
2673 out:
2674 tomoyo_read_unlock(idx);
2675 mutex_unlock(&head->io_sem);
2676 return error;
2677 }
2678
2679 /**
2680 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2681 *
2682 * @head: Pointer to "struct tomoyo_io_buffer".
2683 *
2684 * Returns 0.
2685 */
2686 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2687 {
2688 /*
2689 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2690 * observer counter.
2691 */
2692 if (head->type == TOMOYO_QUERY &&
2693 atomic_dec_and_test(&tomoyo_query_observers))
2694 wake_up_all(&tomoyo_answer_wait);
2695 tomoyo_notify_gc(head, false);
2696 return 0;
2697 }
2698
2699 /**
2700 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2701 */
2702 void tomoyo_check_profile(void)
2703 {
2704 struct tomoyo_domain_info *domain;
2705 const int idx = tomoyo_read_lock();
2706 tomoyo_policy_loaded = true;
2707 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2708 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2709 const u8 profile = domain->profile;
2710 const struct tomoyo_policy_namespace *ns = domain->ns;
2711 if (ns->profile_version != 20110903)
2712 printk(KERN_ERR
2713 "Profile version %u is not supported.\n",
2714 ns->profile_version);
2715 else if (!ns->profile_ptr[profile])
2716 printk(KERN_ERR
2717 "Profile %u (used by '%s') is not defined.\n",
2718 profile, domain->domainname->name);
2719 else
2720 continue;
2721 printk(KERN_ERR
2722 "Userland tools for TOMOYO 2.5 must be installed and "
2723 "policy must be initialized.\n");
2724 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2725 "for more information.\n");
2726 panic("STOP!");
2727 }
2728 tomoyo_read_unlock(idx);
2729 printk(KERN_INFO "Mandatory Access Control activated.\n");
2730 }
2731
2732 /**
2733 * tomoyo_load_builtin_policy - Load built-in policy.
2734 *
2735 * Returns nothing.
2736 */
2737 void __init tomoyo_load_builtin_policy(void)
2738 {
2739 /*
2740 * This include file is manually created and contains built-in policy
2741 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2742 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2743 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2744 */
2745 #include "builtin-policy.h"
2746 u8 i;
2747 const int idx = tomoyo_read_lock();
2748 for (i = 0; i < 5; i++) {
2749 struct tomoyo_io_buffer head = { };
2750 char *start = "";
2751 switch (i) {
2752 case 0:
2753 start = tomoyo_builtin_profile;
2754 head.type = TOMOYO_PROFILE;
2755 head.write = tomoyo_write_profile;
2756 break;
2757 case 1:
2758 start = tomoyo_builtin_exception_policy;
2759 head.type = TOMOYO_EXCEPTIONPOLICY;
2760 head.write = tomoyo_write_exception;
2761 break;
2762 case 2:
2763 start = tomoyo_builtin_domain_policy;
2764 head.type = TOMOYO_DOMAINPOLICY;
2765 head.write = tomoyo_write_domain;
2766 break;
2767 case 3:
2768 start = tomoyo_builtin_manager;
2769 head.type = TOMOYO_MANAGER;
2770 head.write = tomoyo_write_manager;
2771 break;
2772 case 4:
2773 start = tomoyo_builtin_stat;
2774 head.type = TOMOYO_STAT;
2775 head.write = tomoyo_write_stat;
2776 break;
2777 }
2778 while (1) {
2779 char *end = strchr(start, '\n');
2780 if (!end)
2781 break;
2782 *end = '\0';
2783 tomoyo_normalize_line(start);
2784 head.write_buf = start;
2785 tomoyo_parse_policy(&head, start);
2786 start = end + 1;
2787 }
2788 }
2789 tomoyo_read_unlock(idx);
2790 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2791 tomoyo_check_profile();
2792 #endif
2793 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree