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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. */
13const 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 */
21const 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. */
72const 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. */
135static 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. */
141const 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. */
156const 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. */
164static 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? */
172static 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 */
181const 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 */
195static 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 */
211static 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 */
256static 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
265static 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 */
274static 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 */
301static 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 */
313static 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 */
326static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
327{
328 tomoyo_set_string(head, "/");
329}
330
331/* List of namespaces. */
332LIST_HEAD(tomoyo_namespace_list);
333/* True if namespace other than tomoyo_kernel_namespace is defined. */
334static 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 */
343void 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 */
364static 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 */
381static 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 */
401static 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 */
422static 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 */
469static 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 */
484static 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 */
527struct 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 */
545static 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 */
567static 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 */
584static 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 */
660static 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 */
713static 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 */
728static 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 */
825static 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 */
842static int tomoyo_update_manager_entry(const char *manager,
843 const bool is_delete)
844{
845 struct tomoyo_manager e = { };
846 struct tomoyo_acl_param param = {
847 /* .ns = &tomoyo_kernel_namespace, */
848 .is_delete = is_delete,
849 .list = &tomoyo_kernel_namespace.
850 policy_list[TOMOYO_ID_MANAGER],
851 };
852 int error = is_delete ? -ENOENT : -ENOMEM;
853 if (!tomoyo_correct_domain(manager) &&
854 !tomoyo_correct_word(manager))
855 return -EINVAL;
856 e.manager = tomoyo_get_name(manager);
857 if (e.manager) {
858 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m,
859 tomoyo_same_manager);
860 tomoyo_put_name(e.manager);
861 }
862 return error;
863}
864
865/**
866 * tomoyo_write_manager - Write manager policy.
867 *
868 * @head: Pointer to "struct tomoyo_io_buffer".
869 *
870 * Returns 0 on success, negative value otherwise.
871 *
872 * Caller holds tomoyo_read_lock().
873 */
874static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
875{
876 char *data = head->write_buf;
877
878 if (!strcmp(data, "manage_by_non_root")) {
879 tomoyo_manage_by_non_root = !head->w.is_delete;
880 return 0;
881 }
882 return tomoyo_update_manager_entry(data, head->w.is_delete);
883}
884
885/**
886 * tomoyo_read_manager - Read manager policy.
887 *
888 * @head: Pointer to "struct tomoyo_io_buffer".
889 *
890 * Caller holds tomoyo_read_lock().
891 */
892static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
893{
894 if (head->r.eof)
895 return;
896 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
897 policy_list[TOMOYO_ID_MANAGER]) {
898 struct tomoyo_manager *ptr =
899 list_entry(head->r.acl, typeof(*ptr), head.list);
900 if (ptr->head.is_deleted)
901 continue;
902 if (!tomoyo_flush(head))
903 return;
904 tomoyo_set_string(head, ptr->manager->name);
905 tomoyo_set_lf(head);
906 }
907 head->r.eof = true;
908}
909
910/**
911 * tomoyo_manager - Check whether the current process is a policy manager.
912 *
913 * Returns true if the current process is permitted to modify policy
914 * via /sys/kernel/security/tomoyo/ interface.
915 *
916 * Caller holds tomoyo_read_lock().
917 */
918static bool tomoyo_manager(void)
919{
920 struct tomoyo_manager *ptr;
921 const char *exe;
922 const struct task_struct *task = current;
923 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
924 bool found = false;
925
926 if (!tomoyo_policy_loaded)
927 return true;
928 if (!tomoyo_manage_by_non_root &&
929 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) ||
930 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
931 return false;
932 exe = tomoyo_get_exe();
933 if (!exe)
934 return false;
935 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
936 policy_list[TOMOYO_ID_MANAGER], head.list) {
937 if (!ptr->head.is_deleted &&
938 (!tomoyo_pathcmp(domainname, ptr->manager) ||
939 !strcmp(exe, ptr->manager->name))) {
940 found = true;
941 break;
942 }
943 }
944 if (!found) { /* Reduce error messages. */
945 static pid_t last_pid;
946 const pid_t pid = current->pid;
947 if (last_pid != pid) {
948 printk(KERN_WARNING "%s ( %s ) is not permitted to "
949 "update policies.\n", domainname->name, exe);
950 last_pid = pid;
951 }
952 }
953 kfree(exe);
954 return found;
955}
956
957static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
958(unsigned int serial);
959
960/**
961 * tomoyo_select_domain - Parse select command.
962 *
963 * @head: Pointer to "struct tomoyo_io_buffer".
964 * @data: String to parse.
965 *
966 * Returns true on success, false otherwise.
967 *
968 * Caller holds tomoyo_read_lock().
969 */
970static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
971 const char *data)
972{
973 unsigned int pid;
974 struct tomoyo_domain_info *domain = NULL;
975 bool global_pid = false;
976 if (strncmp(data, "select ", 7))
977 return false;
978 data += 7;
979 if (sscanf(data, "pid=%u", &pid) == 1 ||
980 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
981 struct task_struct *p;
982 rcu_read_lock();
983 if (global_pid)
984 p = find_task_by_pid_ns(pid, &init_pid_ns);
985 else
986 p = find_task_by_vpid(pid);
987 if (p)
988 domain = tomoyo_real_domain(p);
989 rcu_read_unlock();
990 } else if (!strncmp(data, "domain=", 7)) {
991 if (tomoyo_domain_def(data + 7))
992 domain = tomoyo_find_domain(data + 7);
993 } else if (sscanf(data, "Q=%u", &pid) == 1) {
994 domain = tomoyo_find_domain_by_qid(pid);
995 } else
996 return false;
997 head->w.domain = domain;
998 /* Accessing read_buf is safe because head->io_sem is held. */
999 if (!head->read_buf)
1000 return true; /* Do nothing if open(O_WRONLY). */
1001 memset(&head->r, 0, sizeof(head->r));
1002 head->r.print_this_domain_only = true;
1003 if (domain)
1004 head->r.domain = &domain->list;
1005 else
1006 head->r.eof = 1;
1007 tomoyo_io_printf(head, "# select %s\n", data);
1008 if (domain && domain->is_deleted)
1009 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010 return true;
1011}
1012
1013/**
1014 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1015 *
1016 * @a: Pointer to "struct tomoyo_acl_info".
1017 * @b: Pointer to "struct tomoyo_acl_info".
1018 *
1019 * Returns true if @a == @b, false otherwise.
1020 */
1021static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1022 const struct tomoyo_acl_info *b)
1023{
1024 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1025 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1026 return p1->domainname == p2->domainname;
1027}
1028
1029/**
1030 * tomoyo_write_task - Update task related list.
1031 *
1032 * @param: Pointer to "struct tomoyo_acl_param".
1033 *
1034 * Returns 0 on success, negative value otherwise.
1035 *
1036 * Caller holds tomoyo_read_lock().
1037 */
1038static int tomoyo_write_task(struct tomoyo_acl_param *param)
1039{
1040 int error = -EINVAL;
1041 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
1042 struct tomoyo_task_acl e = {
1043 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1044 .domainname = tomoyo_get_domainname(param),
1045 };
1046 if (e.domainname)
1047 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1048 tomoyo_same_task_acl,
1049 NULL);
1050 tomoyo_put_name(e.domainname);
1051 }
1052 return error;
1053}
1054
1055/**
1056 * tomoyo_delete_domain - Delete a domain.
1057 *
1058 * @domainname: The name of domain.
1059 *
1060 * Returns 0 on success, negative value otherwise.
1061 *
1062 * Caller holds tomoyo_read_lock().
1063 */
1064static int tomoyo_delete_domain(char *domainname)
1065{
1066 struct tomoyo_domain_info *domain;
1067 struct tomoyo_path_info name;
1068
1069 name.name = domainname;
1070 tomoyo_fill_path_info(&name);
1071 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1072 return -EINTR;
1073 /* Is there an active domain? */
1074 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1075 /* Never delete tomoyo_kernel_domain */
1076 if (domain == &tomoyo_kernel_domain)
1077 continue;
1078 if (domain->is_deleted ||
1079 tomoyo_pathcmp(domain->domainname, &name))
1080 continue;
1081 domain->is_deleted = true;
1082 break;
1083 }
1084 mutex_unlock(&tomoyo_policy_lock);
1085 return 0;
1086}
1087
1088/**
1089 * tomoyo_write_domain2 - Write domain policy.
1090 *
1091 * @ns: Pointer to "struct tomoyo_policy_namespace".
1092 * @list: Pointer to "struct list_head".
1093 * @data: Policy to be interpreted.
1094 * @is_delete: True if it is a delete request.
1095 *
1096 * Returns 0 on success, negative value otherwise.
1097 *
1098 * Caller holds tomoyo_read_lock().
1099 */
1100static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1101 struct list_head *list, char *data,
1102 const bool is_delete)
1103{
1104 struct tomoyo_acl_param param = {
1105 .ns = ns,
1106 .list = list,
1107 .data = data,
1108 .is_delete = is_delete,
1109 };
1110 static const struct {
1111 const char *keyword;
1112 int (*write) (struct tomoyo_acl_param *);
1113 } tomoyo_callback[5] = {
1114 { "file ", tomoyo_write_file },
1115 { "network inet ", tomoyo_write_inet_network },
1116 { "network unix ", tomoyo_write_unix_network },
1117 { "misc ", tomoyo_write_misc },
1118 { "task ", tomoyo_write_task },
1119 };
1120 u8 i;
1121
1122 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1123 if (!tomoyo_str_starts(¶m.data,
1124 tomoyo_callback[i].keyword))
1125 continue;
1126 return tomoyo_callback[i].write(¶m);
1127 }
1128 return -EINVAL;
1129}
1130
1131/* String table for domain flags. */
1132const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1133 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1134 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1135};
1136
1137/**
1138 * tomoyo_write_domain - Write domain policy.
1139 *
1140 * @head: Pointer to "struct tomoyo_io_buffer".
1141 *
1142 * Returns 0 on success, negative value otherwise.
1143 *
1144 * Caller holds tomoyo_read_lock().
1145 */
1146static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1147{
1148 char *data = head->write_buf;
1149 struct tomoyo_policy_namespace *ns;
1150 struct tomoyo_domain_info *domain = head->w.domain;
1151 const bool is_delete = head->w.is_delete;
1152 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1153 unsigned int profile;
1154 if (*data == '<') {
1155 int ret = 0;
1156 domain = NULL;
1157 if (is_delete)
1158 ret = tomoyo_delete_domain(data);
1159 else if (is_select)
1160 domain = tomoyo_find_domain(data);
1161 else
1162 domain = tomoyo_assign_domain(data, false);
1163 head->w.domain = domain;
1164 return ret;
1165 }
1166 if (!domain)
1167 return -EINVAL;
1168 ns = domain->ns;
1169 if (sscanf(data, "use_profile %u", &profile) == 1
1170 && profile < TOMOYO_MAX_PROFILES) {
1171 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1172 domain->profile = (u8) profile;
1173 return 0;
1174 }
1175 if (sscanf(data, "use_group %u\n", &profile) == 1
1176 && profile < TOMOYO_MAX_ACL_GROUPS) {
1177 if (!is_delete)
1178 domain->group = (u8) profile;
1179 return 0;
1180 }
1181 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1182 const char *cp = tomoyo_dif[profile];
1183 if (strncmp(data, cp, strlen(cp) - 1))
1184 continue;
1185 domain->flags[profile] = !is_delete;
1186 return 0;
1187 }
1188 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1189 is_delete);
1190}
1191
1192/**
1193 * tomoyo_print_condition - Print condition part.
1194 *
1195 * @head: Pointer to "struct tomoyo_io_buffer".
1196 * @cond: Pointer to "struct tomoyo_condition".
1197 *
1198 * Returns true on success, false otherwise.
1199 */
1200static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1201 const struct tomoyo_condition *cond)
1202{
1203 switch (head->r.cond_step) {
1204 case 0:
1205 head->r.cond_index = 0;
1206 head->r.cond_step++;
1207 if (cond->transit) {
1208 tomoyo_set_space(head);
1209 tomoyo_set_string(head, cond->transit->name);
1210 }
1211 /* fall through */
1212 case 1:
1213 {
1214 const u16 condc = cond->condc;
1215 const struct tomoyo_condition_element *condp =
1216 (typeof(condp)) (cond + 1);
1217 const struct tomoyo_number_union *numbers_p =
1218 (typeof(numbers_p)) (condp + condc);
1219 const struct tomoyo_name_union *names_p =
1220 (typeof(names_p))
1221 (numbers_p + cond->numbers_count);
1222 const struct tomoyo_argv *argv =
1223 (typeof(argv)) (names_p + cond->names_count);
1224 const struct tomoyo_envp *envp =
1225 (typeof(envp)) (argv + cond->argc);
1226 u16 skip;
1227 for (skip = 0; skip < head->r.cond_index; skip++) {
1228 const u8 left = condp->left;
1229 const u8 right = condp->right;
1230 condp++;
1231 switch (left) {
1232 case TOMOYO_ARGV_ENTRY:
1233 argv++;
1234 continue;
1235 case TOMOYO_ENVP_ENTRY:
1236 envp++;
1237 continue;
1238 case TOMOYO_NUMBER_UNION:
1239 numbers_p++;
1240 break;
1241 }
1242 switch (right) {
1243 case TOMOYO_NAME_UNION:
1244 names_p++;
1245 break;
1246 case TOMOYO_NUMBER_UNION:
1247 numbers_p++;
1248 break;
1249 }
1250 }
1251 while (head->r.cond_index < condc) {
1252 const u8 match = condp->equals;
1253 const u8 left = condp->left;
1254 const u8 right = condp->right;
1255 if (!tomoyo_flush(head))
1256 return false;
1257 condp++;
1258 head->r.cond_index++;
1259 tomoyo_set_space(head);
1260 switch (left) {
1261 case TOMOYO_ARGV_ENTRY:
1262 tomoyo_io_printf(head,
1263 "exec.argv[%lu]%s=\"",
1264 argv->index, argv->
1265 is_not ? "!" : "");
1266 tomoyo_set_string(head,
1267 argv->value->name);
1268 tomoyo_set_string(head, "\"");
1269 argv++;
1270 continue;
1271 case TOMOYO_ENVP_ENTRY:
1272 tomoyo_set_string(head,
1273 "exec.envp[\"");
1274 tomoyo_set_string(head,
1275 envp->name->name);
1276 tomoyo_io_printf(head, "\"]%s=", envp->
1277 is_not ? "!" : "");
1278 if (envp->value) {
1279 tomoyo_set_string(head, "\"");
1280 tomoyo_set_string(head, envp->
1281 value->name);
1282 tomoyo_set_string(head, "\"");
1283 } else {
1284 tomoyo_set_string(head,
1285 "NULL");
1286 }
1287 envp++;
1288 continue;
1289 case TOMOYO_NUMBER_UNION:
1290 tomoyo_print_number_union_nospace
1291 (head, numbers_p++);
1292 break;
1293 default:
1294 tomoyo_set_string(head,
1295 tomoyo_condition_keyword[left]);
1296 break;
1297 }
1298 tomoyo_set_string(head, match ? "=" : "!=");
1299 switch (right) {
1300 case TOMOYO_NAME_UNION:
1301 tomoyo_print_name_union_quoted
1302 (head, names_p++);
1303 break;
1304 case TOMOYO_NUMBER_UNION:
1305 tomoyo_print_number_union_nospace
1306 (head, numbers_p++);
1307 break;
1308 default:
1309 tomoyo_set_string(head,
1310 tomoyo_condition_keyword[right]);
1311 break;
1312 }
1313 }
1314 }
1315 head->r.cond_step++;
1316 /* fall through */
1317 case 2:
1318 if (!tomoyo_flush(head))
1319 break;
1320 head->r.cond_step++;
1321 /* fall through */
1322 case 3:
1323 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1324 tomoyo_io_printf(head, " grant_log=%s",
1325 tomoyo_yesno(cond->grant_log ==
1326 TOMOYO_GRANTLOG_YES));
1327 tomoyo_set_lf(head);
1328 return true;
1329 }
1330 return false;
1331}
1332
1333/**
1334 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1335 *
1336 * @head: Pointer to "struct tomoyo_io_buffer".
1337 * @category: Category name.
1338 *
1339 * Returns nothing.
1340 */
1341static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1342 const char *category)
1343{
1344 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1345 tomoyo_print_namespace(head);
1346 tomoyo_io_printf(head, "acl_group %u ",
1347 head->r.acl_group_index);
1348 }
1349 tomoyo_set_string(head, category);
1350}
1351
1352/**
1353 * tomoyo_print_entry - Print an ACL entry.
1354 *
1355 * @head: Pointer to "struct tomoyo_io_buffer".
1356 * @acl: Pointer to an ACL entry.
1357 *
1358 * Returns true on success, false otherwise.
1359 */
1360static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1361 struct tomoyo_acl_info *acl)
1362{
1363 const u8 acl_type = acl->type;
1364 bool first = true;
1365 u8 bit;
1366
1367 if (head->r.print_cond_part)
1368 goto print_cond_part;
1369 if (acl->is_deleted)
1370 return true;
1371 if (!tomoyo_flush(head))
1372 return false;
1373 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1374 struct tomoyo_path_acl *ptr =
1375 container_of(acl, typeof(*ptr), head);
1376 const u16 perm = ptr->perm;
1377 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1378 if (!(perm & (1 << bit)))
1379 continue;
1380 if (head->r.print_transition_related_only &&
1381 bit != TOMOYO_TYPE_EXECUTE)
1382 continue;
1383 if (first) {
1384 tomoyo_set_group(head, "file ");
1385 first = false;
1386 } else {
1387 tomoyo_set_slash(head);
1388 }
1389 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1390 }
1391 if (first)
1392 return true;
1393 tomoyo_print_name_union(head, &ptr->name);
1394 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1395 struct tomoyo_task_acl *ptr =
1396 container_of(acl, typeof(*ptr), head);
1397 tomoyo_set_group(head, "task ");
1398 tomoyo_set_string(head, "manual_domain_transition ");
1399 tomoyo_set_string(head, ptr->domainname->name);
1400 } else if (head->r.print_transition_related_only) {
1401 return true;
1402 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1403 struct tomoyo_path2_acl *ptr =
1404 container_of(acl, typeof(*ptr), head);
1405 const u8 perm = ptr->perm;
1406 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1407 if (!(perm & (1 << bit)))
1408 continue;
1409 if (first) {
1410 tomoyo_set_group(head, "file ");
1411 first = false;
1412 } else {
1413 tomoyo_set_slash(head);
1414 }
1415 tomoyo_set_string(head, tomoyo_mac_keywords
1416 [tomoyo_pp2mac[bit]]);
1417 }
1418 if (first)
1419 return true;
1420 tomoyo_print_name_union(head, &ptr->name1);
1421 tomoyo_print_name_union(head, &ptr->name2);
1422 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1423 struct tomoyo_path_number_acl *ptr =
1424 container_of(acl, typeof(*ptr), head);
1425 const u8 perm = ptr->perm;
1426 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1427 if (!(perm & (1 << bit)))
1428 continue;
1429 if (first) {
1430 tomoyo_set_group(head, "file ");
1431 first = false;
1432 } else {
1433 tomoyo_set_slash(head);
1434 }
1435 tomoyo_set_string(head, tomoyo_mac_keywords
1436 [tomoyo_pn2mac[bit]]);
1437 }
1438 if (first)
1439 return true;
1440 tomoyo_print_name_union(head, &ptr->name);
1441 tomoyo_print_number_union(head, &ptr->number);
1442 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1443 struct tomoyo_mkdev_acl *ptr =
1444 container_of(acl, typeof(*ptr), head);
1445 const u8 perm = ptr->perm;
1446 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1447 if (!(perm & (1 << bit)))
1448 continue;
1449 if (first) {
1450 tomoyo_set_group(head, "file ");
1451 first = false;
1452 } else {
1453 tomoyo_set_slash(head);
1454 }
1455 tomoyo_set_string(head, tomoyo_mac_keywords
1456 [tomoyo_pnnn2mac[bit]]);
1457 }
1458 if (first)
1459 return true;
1460 tomoyo_print_name_union(head, &ptr->name);
1461 tomoyo_print_number_union(head, &ptr->mode);
1462 tomoyo_print_number_union(head, &ptr->major);
1463 tomoyo_print_number_union(head, &ptr->minor);
1464 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1465 struct tomoyo_inet_acl *ptr =
1466 container_of(acl, typeof(*ptr), head);
1467 const u8 perm = ptr->perm;
1468
1469 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1470 if (!(perm & (1 << bit)))
1471 continue;
1472 if (first) {
1473 tomoyo_set_group(head, "network inet ");
1474 tomoyo_set_string(head, tomoyo_proto_keyword
1475 [ptr->protocol]);
1476 tomoyo_set_space(head);
1477 first = false;
1478 } else {
1479 tomoyo_set_slash(head);
1480 }
1481 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1482 }
1483 if (first)
1484 return true;
1485 tomoyo_set_space(head);
1486 if (ptr->address.group) {
1487 tomoyo_set_string(head, "@");
1488 tomoyo_set_string(head, ptr->address.group->group_name
1489 ->name);
1490 } else {
1491 char buf[128];
1492 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1493 tomoyo_io_printf(head, "%s", buf);
1494 }
1495 tomoyo_print_number_union(head, &ptr->port);
1496 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1497 struct tomoyo_unix_acl *ptr =
1498 container_of(acl, typeof(*ptr), head);
1499 const u8 perm = ptr->perm;
1500
1501 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1502 if (!(perm & (1 << bit)))
1503 continue;
1504 if (first) {
1505 tomoyo_set_group(head, "network unix ");
1506 tomoyo_set_string(head, tomoyo_proto_keyword
1507 [ptr->protocol]);
1508 tomoyo_set_space(head);
1509 first = false;
1510 } else {
1511 tomoyo_set_slash(head);
1512 }
1513 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1514 }
1515 if (first)
1516 return true;
1517 tomoyo_print_name_union(head, &ptr->name);
1518 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1519 struct tomoyo_mount_acl *ptr =
1520 container_of(acl, typeof(*ptr), head);
1521 tomoyo_set_group(head, "file mount");
1522 tomoyo_print_name_union(head, &ptr->dev_name);
1523 tomoyo_print_name_union(head, &ptr->dir_name);
1524 tomoyo_print_name_union(head, &ptr->fs_type);
1525 tomoyo_print_number_union(head, &ptr->flags);
1526 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1527 struct tomoyo_env_acl *ptr =
1528 container_of(acl, typeof(*ptr), head);
1529
1530 tomoyo_set_group(head, "misc env ");
1531 tomoyo_set_string(head, ptr->env->name);
1532 }
1533 if (acl->cond) {
1534 head->r.print_cond_part = true;
1535 head->r.cond_step = 0;
1536 if (!tomoyo_flush(head))
1537 return false;
1538print_cond_part:
1539 if (!tomoyo_print_condition(head, acl->cond))
1540 return false;
1541 head->r.print_cond_part = false;
1542 } else {
1543 tomoyo_set_lf(head);
1544 }
1545 return true;
1546}
1547
1548/**
1549 * tomoyo_read_domain2 - Read domain policy.
1550 *
1551 * @head: Pointer to "struct tomoyo_io_buffer".
1552 * @list: Pointer to "struct list_head".
1553 *
1554 * Caller holds tomoyo_read_lock().
1555 *
1556 * Returns true on success, false otherwise.
1557 */
1558static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1559 struct list_head *list)
1560{
1561 list_for_each_cookie(head->r.acl, list) {
1562 struct tomoyo_acl_info *ptr =
1563 list_entry(head->r.acl, typeof(*ptr), list);
1564 if (!tomoyo_print_entry(head, ptr))
1565 return false;
1566 }
1567 head->r.acl = NULL;
1568 return true;
1569}
1570
1571/**
1572 * tomoyo_read_domain - Read domain policy.
1573 *
1574 * @head: Pointer to "struct tomoyo_io_buffer".
1575 *
1576 * Caller holds tomoyo_read_lock().
1577 */
1578static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1579{
1580 if (head->r.eof)
1581 return;
1582 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1583 struct tomoyo_domain_info *domain =
1584 list_entry(head->r.domain, typeof(*domain), list);
1585 switch (head->r.step) {
1586 u8 i;
1587 case 0:
1588 if (domain->is_deleted &&
1589 !head->r.print_this_domain_only)
1590 continue;
1591 /* Print domainname and flags. */
1592 tomoyo_set_string(head, domain->domainname->name);
1593 tomoyo_set_lf(head);
1594 tomoyo_io_printf(head, "use_profile %u\n",
1595 domain->profile);
1596 tomoyo_io_printf(head, "use_group %u\n",
1597 domain->group);
1598 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1599 if (domain->flags[i])
1600 tomoyo_set_string(head, tomoyo_dif[i]);
1601 head->r.step++;
1602 tomoyo_set_lf(head);
1603 /* fall through */
1604 case 1:
1605 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1606 return;
1607 head->r.step++;
1608 if (!tomoyo_set_lf(head))
1609 return;
1610 /* fall through */
1611 case 2:
1612 head->r.step = 0;
1613 if (head->r.print_this_domain_only)
1614 goto done;
1615 }
1616 }
1617 done:
1618 head->r.eof = true;
1619}
1620
1621/**
1622 * tomoyo_write_pid: Specify PID to obtain domainname.
1623 *
1624 * @head: Pointer to "struct tomoyo_io_buffer".
1625 *
1626 * Returns 0.
1627 */
1628static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1629{
1630 head->r.eof = false;
1631 return 0;
1632}
1633
1634/**
1635 * tomoyo_read_pid - Get domainname of the specified PID.
1636 *
1637 * @head: Pointer to "struct tomoyo_io_buffer".
1638 *
1639 * Returns the domainname which the specified PID is in on success,
1640 * empty string otherwise.
1641 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1642 * using read()/write() interface rather than sysctl() interface.
1643 */
1644static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1645{
1646 char *buf = head->write_buf;
1647 bool global_pid = false;
1648 unsigned int pid;
1649 struct task_struct *p;
1650 struct tomoyo_domain_info *domain = NULL;
1651
1652 /* Accessing write_buf is safe because head->io_sem is held. */
1653 if (!buf) {
1654 head->r.eof = true;
1655 return; /* Do nothing if open(O_RDONLY). */
1656 }
1657 if (head->r.w_pos || head->r.eof)
1658 return;
1659 head->r.eof = true;
1660 if (tomoyo_str_starts(&buf, "global-pid "))
1661 global_pid = true;
1662 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1663 rcu_read_lock();
1664 if (global_pid)
1665 p = find_task_by_pid_ns(pid, &init_pid_ns);
1666 else
1667 p = find_task_by_vpid(pid);
1668 if (p)
1669 domain = tomoyo_real_domain(p);
1670 rcu_read_unlock();
1671 if (!domain)
1672 return;
1673 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1674 tomoyo_set_string(head, domain->domainname->name);
1675}
1676
1677/* String table for domain transition control keywords. */
1678static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1679 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1680 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1681 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1682 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1683 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1684 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1685};
1686
1687/* String table for grouping keywords. */
1688static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1689 [TOMOYO_PATH_GROUP] = "path_group ",
1690 [TOMOYO_NUMBER_GROUP] = "number_group ",
1691 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1692};
1693
1694/**
1695 * tomoyo_write_exception - Write exception policy.
1696 *
1697 * @head: Pointer to "struct tomoyo_io_buffer".
1698 *
1699 * Returns 0 on success, negative value otherwise.
1700 *
1701 * Caller holds tomoyo_read_lock().
1702 */
1703static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1704{
1705 const bool is_delete = head->w.is_delete;
1706 struct tomoyo_acl_param param = {
1707 .ns = head->w.ns,
1708 .is_delete = is_delete,
1709 .data = head->write_buf,
1710 };
1711 u8 i;
1712 if (tomoyo_str_starts(¶m.data, "aggregator "))
1713 return tomoyo_write_aggregator(¶m);
1714 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1715 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i]))
1716 return tomoyo_write_transition_control(¶m, i);
1717 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1718 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i]))
1719 return tomoyo_write_group(¶m, i);
1720 if (tomoyo_str_starts(¶m.data, "acl_group ")) {
1721 unsigned int group;
1722 char *data;
1723 group = simple_strtoul(param.data, &data, 10);
1724 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1725 return tomoyo_write_domain2
1726 (head->w.ns, &head->w.ns->acl_group[group],
1727 data, is_delete);
1728 }
1729 return -EINVAL;
1730}
1731
1732/**
1733 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1734 *
1735 * @head: Pointer to "struct tomoyo_io_buffer".
1736 * @idx: Index number.
1737 *
1738 * Returns true on success, false otherwise.
1739 *
1740 * Caller holds tomoyo_read_lock().
1741 */
1742static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1743{
1744 struct tomoyo_policy_namespace *ns =
1745 container_of(head->r.ns, typeof(*ns), namespace_list);
1746 struct list_head *list = &ns->group_list[idx];
1747 list_for_each_cookie(head->r.group, list) {
1748 struct tomoyo_group *group =
1749 list_entry(head->r.group, typeof(*group), head.list);
1750 list_for_each_cookie(head->r.acl, &group->member_list) {
1751 struct tomoyo_acl_head *ptr =
1752 list_entry(head->r.acl, typeof(*ptr), list);
1753 if (ptr->is_deleted)
1754 continue;
1755 if (!tomoyo_flush(head))
1756 return false;
1757 tomoyo_print_namespace(head);
1758 tomoyo_set_string(head, tomoyo_group_name[idx]);
1759 tomoyo_set_string(head, group->group_name->name);
1760 if (idx == TOMOYO_PATH_GROUP) {
1761 tomoyo_set_space(head);
1762 tomoyo_set_string(head, container_of
1763 (ptr, struct tomoyo_path_group,
1764 head)->member_name->name);
1765 } else if (idx == TOMOYO_NUMBER_GROUP) {
1766 tomoyo_print_number_union(head, &container_of
1767 (ptr,
1768 struct tomoyo_number_group,
1769 head)->number);
1770 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1771 char buffer[128];
1772
1773 struct tomoyo_address_group *member =
1774 container_of(ptr, typeof(*member),
1775 head);
1776 tomoyo_print_ip(buffer, sizeof(buffer),
1777 &member->address);
1778 tomoyo_io_printf(head, " %s", buffer);
1779 }
1780 tomoyo_set_lf(head);
1781 }
1782 head->r.acl = NULL;
1783 }
1784 head->r.group = NULL;
1785 return true;
1786}
1787
1788/**
1789 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1790 *
1791 * @head: Pointer to "struct tomoyo_io_buffer".
1792 * @idx: Index number.
1793 *
1794 * Returns true on success, false otherwise.
1795 *
1796 * Caller holds tomoyo_read_lock().
1797 */
1798static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1799{
1800 struct tomoyo_policy_namespace *ns =
1801 container_of(head->r.ns, typeof(*ns), namespace_list);
1802 struct list_head *list = &ns->policy_list[idx];
1803 list_for_each_cookie(head->r.acl, list) {
1804 struct tomoyo_acl_head *acl =
1805 container_of(head->r.acl, typeof(*acl), list);
1806 if (acl->is_deleted)
1807 continue;
1808 if (!tomoyo_flush(head))
1809 return false;
1810 switch (idx) {
1811 case TOMOYO_ID_TRANSITION_CONTROL:
1812 {
1813 struct tomoyo_transition_control *ptr =
1814 container_of(acl, typeof(*ptr), head);
1815 tomoyo_print_namespace(head);
1816 tomoyo_set_string(head, tomoyo_transition_type
1817 [ptr->type]);
1818 tomoyo_set_string(head, ptr->program ?
1819 ptr->program->name : "any");
1820 tomoyo_set_string(head, " from ");
1821 tomoyo_set_string(head, ptr->domainname ?
1822 ptr->domainname->name :
1823 "any");
1824 }
1825 break;
1826 case TOMOYO_ID_AGGREGATOR:
1827 {
1828 struct tomoyo_aggregator *ptr =
1829 container_of(acl, typeof(*ptr), head);
1830 tomoyo_print_namespace(head);
1831 tomoyo_set_string(head, "aggregator ");
1832 tomoyo_set_string(head,
1833 ptr->original_name->name);
1834 tomoyo_set_space(head);
1835 tomoyo_set_string(head,
1836 ptr->aggregated_name->name);
1837 }
1838 break;
1839 default:
1840 continue;
1841 }
1842 tomoyo_set_lf(head);
1843 }
1844 head->r.acl = NULL;
1845 return true;
1846}
1847
1848/**
1849 * tomoyo_read_exception - Read exception policy.
1850 *
1851 * @head: Pointer to "struct tomoyo_io_buffer".
1852 *
1853 * Caller holds tomoyo_read_lock().
1854 */
1855static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1856{
1857 struct tomoyo_policy_namespace *ns =
1858 container_of(head->r.ns, typeof(*ns), namespace_list);
1859 if (head->r.eof)
1860 return;
1861 while (head->r.step < TOMOYO_MAX_POLICY &&
1862 tomoyo_read_policy(head, head->r.step))
1863 head->r.step++;
1864 if (head->r.step < TOMOYO_MAX_POLICY)
1865 return;
1866 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1867 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1868 head->r.step++;
1869 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1870 return;
1871 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1872 + TOMOYO_MAX_ACL_GROUPS) {
1873 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1874 - TOMOYO_MAX_GROUP;
1875 if (!tomoyo_read_domain2(head, &ns->acl_group
1876 [head->r.acl_group_index]))
1877 return;
1878 head->r.step++;
1879 }
1880 head->r.eof = true;
1881}
1882
1883/* Wait queue for kernel -> userspace notification. */
1884static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1885/* Wait queue for userspace -> kernel notification. */
1886static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1887
1888/* Structure for query. */
1889struct tomoyo_query {
1890 struct list_head list;
1891 struct tomoyo_domain_info *domain;
1892 char *query;
1893 size_t query_len;
1894 unsigned int serial;
1895 u8 timer;
1896 u8 answer;
1897 u8 retry;
1898};
1899
1900/* The list for "struct tomoyo_query". */
1901static LIST_HEAD(tomoyo_query_list);
1902
1903/* Lock for manipulating tomoyo_query_list. */
1904static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1905
1906/*
1907 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1908 * interface.
1909 */
1910static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1911
1912/**
1913 * tomoyo_truncate - Truncate a line.
1914 *
1915 * @str: String to truncate.
1916 *
1917 * Returns length of truncated @str.
1918 */
1919static int tomoyo_truncate(char *str)
1920{
1921 char *start = str;
1922 while (*(unsigned char *) str > (unsigned char) ' ')
1923 str++;
1924 *str = '\0';
1925 return strlen(start) + 1;
1926}
1927
1928/**
1929 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1930 *
1931 * @domain: Pointer to "struct tomoyo_domain_info".
1932 * @header: Lines containing ACL.
1933 *
1934 * Returns nothing.
1935 */
1936static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1937{
1938 char *buffer;
1939 char *realpath = NULL;
1940 char *argv0 = NULL;
1941 char *symlink = NULL;
1942 char *cp = strchr(header, '\n');
1943 int len;
1944 if (!cp)
1945 return;
1946 cp = strchr(cp + 1, '\n');
1947 if (!cp)
1948 return;
1949 *cp++ = '\0';
1950 len = strlen(cp) + 1;
1951 /* strstr() will return NULL if ordering is wrong. */
1952 if (*cp == 'f') {
1953 argv0 = strstr(header, " argv[]={ \"");
1954 if (argv0) {
1955 argv0 += 10;
1956 len += tomoyo_truncate(argv0) + 14;
1957 }
1958 realpath = strstr(header, " exec={ realpath=\"");
1959 if (realpath) {
1960 realpath += 8;
1961 len += tomoyo_truncate(realpath) + 6;
1962 }
1963 symlink = strstr(header, " symlink.target=\"");
1964 if (symlink)
1965 len += tomoyo_truncate(symlink + 1) + 1;
1966 }
1967 buffer = kmalloc(len, GFP_NOFS);
1968 if (!buffer)
1969 return;
1970 snprintf(buffer, len - 1, "%s", cp);
1971 if (realpath)
1972 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1973 if (argv0)
1974 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1975 if (symlink)
1976 tomoyo_addprintf(buffer, len, "%s", symlink);
1977 tomoyo_normalize_line(buffer);
1978 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1979 false))
1980 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1981 kfree(buffer);
1982}
1983
1984/**
1985 * tomoyo_supervisor - Ask for the supervisor's decision.
1986 *
1987 * @r: Pointer to "struct tomoyo_request_info".
1988 * @fmt: The printf()'s format string, followed by parameters.
1989 *
1990 * Returns 0 if the supervisor decided to permit the access request which
1991 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1992 * supervisor decided to retry the access request which violated the policy in
1993 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1994 */
1995int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1996{
1997 va_list args;
1998 int error;
1999 int len;
2000 static unsigned int tomoyo_serial;
2001 struct tomoyo_query entry = { };
2002 bool quota_exceeded = false;
2003 va_start(args, fmt);
2004 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2005 va_end(args);
2006 /* Write /sys/kernel/security/tomoyo/audit. */
2007 va_start(args, fmt);
2008 tomoyo_write_log2(r, len, fmt, args);
2009 va_end(args);
2010 /* Nothing more to do if granted. */
2011 if (r->granted)
2012 return 0;
2013 if (r->mode)
2014 tomoyo_update_stat(r->mode);
2015 switch (r->mode) {
2016 case TOMOYO_CONFIG_ENFORCING:
2017 error = -EPERM;
2018 if (atomic_read(&tomoyo_query_observers))
2019 break;
2020 goto out;
2021 case TOMOYO_CONFIG_LEARNING:
2022 error = 0;
2023 /* Check max_learning_entry parameter. */
2024 if (tomoyo_domain_quota_is_ok(r))
2025 break;
2026 /* fall through */
2027 default:
2028 return 0;
2029 }
2030 /* Get message. */
2031 va_start(args, fmt);
2032 entry.query = tomoyo_init_log(r, len, fmt, args);
2033 va_end(args);
2034 if (!entry.query)
2035 goto out;
2036 entry.query_len = strlen(entry.query) + 1;
2037 if (!error) {
2038 tomoyo_add_entry(r->domain, entry.query);
2039 goto out;
2040 }
2041 len = tomoyo_round2(entry.query_len);
2042 entry.domain = r->domain;
2043 spin_lock(&tomoyo_query_list_lock);
2044 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2045 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2046 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2047 quota_exceeded = true;
2048 } else {
2049 entry.serial = tomoyo_serial++;
2050 entry.retry = r->retry;
2051 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2052 list_add_tail(&entry.list, &tomoyo_query_list);
2053 }
2054 spin_unlock(&tomoyo_query_list_lock);
2055 if (quota_exceeded)
2056 goto out;
2057 /* Give 10 seconds for supervisor's opinion. */
2058 while (entry.timer < 10) {
2059 wake_up_all(&tomoyo_query_wait);
2060 if (wait_event_interruptible_timeout
2061 (tomoyo_answer_wait, entry.answer ||
2062 !atomic_read(&tomoyo_query_observers), HZ))
2063 break;
2064 else
2065 entry.timer++;
2066 }
2067 spin_lock(&tomoyo_query_list_lock);
2068 list_del(&entry.list);
2069 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2070 spin_unlock(&tomoyo_query_list_lock);
2071 switch (entry.answer) {
2072 case 3: /* Asked to retry by administrator. */
2073 error = TOMOYO_RETRY_REQUEST;
2074 r->retry++;
2075 break;
2076 case 1:
2077 /* Granted by administrator. */
2078 error = 0;
2079 break;
2080 default:
2081 /* Timed out or rejected by administrator. */
2082 break;
2083 }
2084out:
2085 kfree(entry.query);
2086 return error;
2087}
2088
2089/**
2090 * tomoyo_find_domain_by_qid - Get domain by query id.
2091 *
2092 * @serial: Query ID assigned by tomoyo_supervisor().
2093 *
2094 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2095 */
2096static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2097(unsigned int serial)
2098{
2099 struct tomoyo_query *ptr;
2100 struct tomoyo_domain_info *domain = NULL;
2101 spin_lock(&tomoyo_query_list_lock);
2102 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2103 if (ptr->serial != serial)
2104 continue;
2105 domain = ptr->domain;
2106 break;
2107 }
2108 spin_unlock(&tomoyo_query_list_lock);
2109 return domain;
2110}
2111
2112/**
2113 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2114 *
2115 * @file: Pointer to "struct file".
2116 * @wait: Pointer to "poll_table".
2117 *
2118 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2119 *
2120 * Waits for access requests which violated policy in enforcing mode.
2121 */
2122static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2123{
2124 if (!list_empty(&tomoyo_query_list))
2125 return POLLIN | POLLRDNORM;
2126 poll_wait(file, &tomoyo_query_wait, wait);
2127 if (!list_empty(&tomoyo_query_list))
2128 return POLLIN | POLLRDNORM;
2129 return 0;
2130}
2131
2132/**
2133 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2134 *
2135 * @head: Pointer to "struct tomoyo_io_buffer".
2136 */
2137static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2138{
2139 struct list_head *tmp;
2140 unsigned int pos = 0;
2141 size_t len = 0;
2142 char *buf;
2143 if (head->r.w_pos)
2144 return;
2145 if (head->read_buf) {
2146 kfree(head->read_buf);
2147 head->read_buf = NULL;
2148 }
2149 spin_lock(&tomoyo_query_list_lock);
2150 list_for_each(tmp, &tomoyo_query_list) {
2151 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2152 if (pos++ != head->r.query_index)
2153 continue;
2154 len = ptr->query_len;
2155 break;
2156 }
2157 spin_unlock(&tomoyo_query_list_lock);
2158 if (!len) {
2159 head->r.query_index = 0;
2160 return;
2161 }
2162 buf = kzalloc(len + 32, GFP_NOFS);
2163 if (!buf)
2164 return;
2165 pos = 0;
2166 spin_lock(&tomoyo_query_list_lock);
2167 list_for_each(tmp, &tomoyo_query_list) {
2168 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2169 if (pos++ != head->r.query_index)
2170 continue;
2171 /*
2172 * Some query can be skipped because tomoyo_query_list
2173 * can change, but I don't care.
2174 */
2175 if (len == ptr->query_len)
2176 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2177 ptr->retry, ptr->query);
2178 break;
2179 }
2180 spin_unlock(&tomoyo_query_list_lock);
2181 if (buf[0]) {
2182 head->read_buf = buf;
2183 head->r.w[head->r.w_pos++] = buf;
2184 head->r.query_index++;
2185 } else {
2186 kfree(buf);
2187 }
2188}
2189
2190/**
2191 * tomoyo_write_answer - Write the supervisor's decision.
2192 *
2193 * @head: Pointer to "struct tomoyo_io_buffer".
2194 *
2195 * Returns 0 on success, -EINVAL otherwise.
2196 */
2197static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2198{
2199 char *data = head->write_buf;
2200 struct list_head *tmp;
2201 unsigned int serial;
2202 unsigned int answer;
2203 spin_lock(&tomoyo_query_list_lock);
2204 list_for_each(tmp, &tomoyo_query_list) {
2205 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2206 ptr->timer = 0;
2207 }
2208 spin_unlock(&tomoyo_query_list_lock);
2209 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2210 return -EINVAL;
2211 spin_lock(&tomoyo_query_list_lock);
2212 list_for_each(tmp, &tomoyo_query_list) {
2213 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2214 if (ptr->serial != serial)
2215 continue;
2216 ptr->answer = answer;
2217 /* Remove from tomoyo_query_list. */
2218 if (ptr->answer)
2219 list_del_init(&ptr->list);
2220 break;
2221 }
2222 spin_unlock(&tomoyo_query_list_lock);
2223 return 0;
2224}
2225
2226/**
2227 * tomoyo_read_version: Get version.
2228 *
2229 * @head: Pointer to "struct tomoyo_io_buffer".
2230 *
2231 * Returns version information.
2232 */
2233static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2234{
2235 if (!head->r.eof) {
2236 tomoyo_io_printf(head, "2.5.0");
2237 head->r.eof = true;
2238 }
2239}
2240
2241/* String table for /sys/kernel/security/tomoyo/stat interface. */
2242static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2243 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2244 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2245 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2246 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2247};
2248
2249/* String table for /sys/kernel/security/tomoyo/stat interface. */
2250static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2251 [TOMOYO_MEMORY_POLICY] = "policy:",
2252 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2253 [TOMOYO_MEMORY_QUERY] = "query message:",
2254};
2255
2256/* Timestamp counter for last updated. */
2257static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2258/* Counter for number of updates. */
2259static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2260
2261/**
2262 * tomoyo_update_stat - Update statistic counters.
2263 *
2264 * @index: Index for policy type.
2265 *
2266 * Returns nothing.
2267 */
2268void tomoyo_update_stat(const u8 index)
2269{
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] = get_seconds();
2275}
2276
2277/**
2278 * tomoyo_read_stat - Read statistic data.
2279 *
2280 * @head: Pointer to "struct tomoyo_io_buffer".
2281 *
2282 * Returns nothing.
2283 */
2284static 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 */
2326static 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 */
2345int 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". Maybe NULL.
2451 *
2452 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2453 * POLLOUT | POLLWRNORM otherwise.
2454 */
2455unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2456{
2457 struct tomoyo_io_buffer *head = file->private_data;
2458 if (head->poll)
2459 return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2460 return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2461}
2462
2463/**
2464 * tomoyo_set_namespace_cursor - Set namespace to read.
2465 *
2466 * @head: Pointer to "struct tomoyo_io_buffer".
2467 *
2468 * Returns nothing.
2469 */
2470static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2471{
2472 struct list_head *ns;
2473 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2474 head->type != TOMOYO_PROFILE)
2475 return;
2476 /*
2477 * If this is the first read, or reading previous namespace finished
2478 * and has more namespaces to read, update the namespace cursor.
2479 */
2480 ns = head->r.ns;
2481 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2482 /* Clearing is OK because tomoyo_flush() returned true. */
2483 memset(&head->r, 0, sizeof(head->r));
2484 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2485 }
2486}
2487
2488/**
2489 * tomoyo_has_more_namespace - Check for unread namespaces.
2490 *
2491 * @head: Pointer to "struct tomoyo_io_buffer".
2492 *
2493 * Returns true if we have more entries to print, false otherwise.
2494 */
2495static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2496{
2497 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2498 head->type == TOMOYO_PROFILE) && head->r.eof &&
2499 head->r.ns->next != &tomoyo_namespace_list;
2500}
2501
2502/**
2503 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2504 *
2505 * @head: Pointer to "struct tomoyo_io_buffer".
2506 * @buffer: Poiner to buffer to write to.
2507 * @buffer_len: Size of @buffer.
2508 *
2509 * Returns bytes read on success, negative value otherwise.
2510 */
2511ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2512 const int buffer_len)
2513{
2514 int len;
2515 int idx;
2516
2517 if (!head->read)
2518 return -ENOSYS;
2519 if (mutex_lock_interruptible(&head->io_sem))
2520 return -EINTR;
2521 head->read_user_buf = buffer;
2522 head->read_user_buf_avail = buffer_len;
2523 idx = tomoyo_read_lock();
2524 if (tomoyo_flush(head))
2525 /* Call the policy handler. */
2526 do {
2527 tomoyo_set_namespace_cursor(head);
2528 head->read(head);
2529 } while (tomoyo_flush(head) &&
2530 tomoyo_has_more_namespace(head));
2531 tomoyo_read_unlock(idx);
2532 len = head->read_user_buf - buffer;
2533 mutex_unlock(&head->io_sem);
2534 return len;
2535}
2536
2537/**
2538 * tomoyo_parse_policy - Parse a policy line.
2539 *
2540 * @head: Poiter to "struct tomoyo_io_buffer".
2541 * @line: Line to parse.
2542 *
2543 * Returns 0 on success, negative value otherwise.
2544 *
2545 * Caller holds tomoyo_read_lock().
2546 */
2547static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2548{
2549 /* Delete request? */
2550 head->w.is_delete = !strncmp(line, "delete ", 7);
2551 if (head->w.is_delete)
2552 memmove(line, line + 7, strlen(line + 7) + 1);
2553 /* Selecting namespace to update. */
2554 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2555 head->type == TOMOYO_PROFILE) {
2556 if (*line == '<') {
2557 char *cp = strchr(line, ' ');
2558 if (cp) {
2559 *cp++ = '\0';
2560 head->w.ns = tomoyo_assign_namespace(line);
2561 memmove(line, cp, strlen(cp) + 1);
2562 } else
2563 head->w.ns = NULL;
2564 } else
2565 head->w.ns = &tomoyo_kernel_namespace;
2566 /* Don't allow updating if namespace is invalid. */
2567 if (!head->w.ns)
2568 return -ENOENT;
2569 }
2570 /* Do the update. */
2571 return head->write(head);
2572}
2573
2574/**
2575 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2576 *
2577 * @head: Pointer to "struct tomoyo_io_buffer".
2578 * @buffer: Pointer to buffer to read from.
2579 * @buffer_len: Size of @buffer.
2580 *
2581 * Returns @buffer_len on success, negative value otherwise.
2582 */
2583ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2584 const char __user *buffer, const int buffer_len)
2585{
2586 int error = buffer_len;
2587 size_t avail_len = buffer_len;
2588 char *cp0 = head->write_buf;
2589 int idx;
2590 if (!head->write)
2591 return -ENOSYS;
2592 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2593 return -EFAULT;
2594 if (mutex_lock_interruptible(&head->io_sem))
2595 return -EINTR;
2596 head->read_user_buf_avail = 0;
2597 idx = tomoyo_read_lock();
2598 /* Read a line and dispatch it to the policy handler. */
2599 while (avail_len > 0) {
2600 char c;
2601 if (head->w.avail >= head->writebuf_size - 1) {
2602 const int len = head->writebuf_size * 2;
2603 char *cp = kzalloc(len, GFP_NOFS);
2604 if (!cp) {
2605 error = -ENOMEM;
2606 break;
2607 }
2608 memmove(cp, cp0, head->w.avail);
2609 kfree(cp0);
2610 head->write_buf = cp;
2611 cp0 = cp;
2612 head->writebuf_size = len;
2613 }
2614 if (get_user(c, buffer)) {
2615 error = -EFAULT;
2616 break;
2617 }
2618 buffer++;
2619 avail_len--;
2620 cp0[head->w.avail++] = c;
2621 if (c != '\n')
2622 continue;
2623 cp0[head->w.avail - 1] = '\0';
2624 head->w.avail = 0;
2625 tomoyo_normalize_line(cp0);
2626 if (!strcmp(cp0, "reset")) {
2627 head->w.ns = &tomoyo_kernel_namespace;
2628 head->w.domain = NULL;
2629 memset(&head->r, 0, sizeof(head->r));
2630 continue;
2631 }
2632 /* Don't allow updating policies by non manager programs. */
2633 switch (head->type) {
2634 case TOMOYO_PROCESS_STATUS:
2635 /* This does not write anything. */
2636 break;
2637 case TOMOYO_DOMAINPOLICY:
2638 if (tomoyo_select_domain(head, cp0))
2639 continue;
2640 /* fall through */
2641 case TOMOYO_EXCEPTIONPOLICY:
2642 if (!strcmp(cp0, "select transition_only")) {
2643 head->r.print_transition_related_only = true;
2644 continue;
2645 }
2646 /* fall through */
2647 default:
2648 if (!tomoyo_manager()) {
2649 error = -EPERM;
2650 goto out;
2651 }
2652 }
2653 switch (tomoyo_parse_policy(head, cp0)) {
2654 case -EPERM:
2655 error = -EPERM;
2656 goto out;
2657 case 0:
2658 switch (head->type) {
2659 case TOMOYO_DOMAINPOLICY:
2660 case TOMOYO_EXCEPTIONPOLICY:
2661 case TOMOYO_STAT:
2662 case TOMOYO_PROFILE:
2663 case TOMOYO_MANAGER:
2664 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2665 break;
2666 default:
2667 break;
2668 }
2669 break;
2670 }
2671 }
2672out:
2673 tomoyo_read_unlock(idx);
2674 mutex_unlock(&head->io_sem);
2675 return error;
2676}
2677
2678/**
2679 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2680 *
2681 * @head: Pointer to "struct tomoyo_io_buffer".
2682 */
2683void tomoyo_close_control(struct tomoyo_io_buffer *head)
2684{
2685 /*
2686 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2687 * observer counter.
2688 */
2689 if (head->type == TOMOYO_QUERY &&
2690 atomic_dec_and_test(&tomoyo_query_observers))
2691 wake_up_all(&tomoyo_answer_wait);
2692 tomoyo_notify_gc(head, false);
2693}
2694
2695/**
2696 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2697 */
2698void tomoyo_check_profile(void)
2699{
2700 struct tomoyo_domain_info *domain;
2701 const int idx = tomoyo_read_lock();
2702 tomoyo_policy_loaded = true;
2703 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2704 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2705 const u8 profile = domain->profile;
2706 const struct tomoyo_policy_namespace *ns = domain->ns;
2707 if (ns->profile_version != 20110903)
2708 printk(KERN_ERR
2709 "Profile version %u is not supported.\n",
2710 ns->profile_version);
2711 else if (!ns->profile_ptr[profile])
2712 printk(KERN_ERR
2713 "Profile %u (used by '%s') is not defined.\n",
2714 profile, domain->domainname->name);
2715 else
2716 continue;
2717 printk(KERN_ERR
2718 "Userland tools for TOMOYO 2.5 must be installed and "
2719 "policy must be initialized.\n");
2720 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2721 "for more information.\n");
2722 panic("STOP!");
2723 }
2724 tomoyo_read_unlock(idx);
2725 printk(KERN_INFO "Mandatory Access Control activated.\n");
2726}
2727
2728/**
2729 * tomoyo_load_builtin_policy - Load built-in policy.
2730 *
2731 * Returns nothing.
2732 */
2733void __init tomoyo_load_builtin_policy(void)
2734{
2735 /*
2736 * This include file is manually created and contains built-in policy
2737 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2738 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2739 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2740 */
2741#include "builtin-policy.h"
2742 u8 i;
2743 const int idx = tomoyo_read_lock();
2744 for (i = 0; i < 5; i++) {
2745 struct tomoyo_io_buffer head = { };
2746 char *start = "";
2747 switch (i) {
2748 case 0:
2749 start = tomoyo_builtin_profile;
2750 head.type = TOMOYO_PROFILE;
2751 head.write = tomoyo_write_profile;
2752 break;
2753 case 1:
2754 start = tomoyo_builtin_exception_policy;
2755 head.type = TOMOYO_EXCEPTIONPOLICY;
2756 head.write = tomoyo_write_exception;
2757 break;
2758 case 2:
2759 start = tomoyo_builtin_domain_policy;
2760 head.type = TOMOYO_DOMAINPOLICY;
2761 head.write = tomoyo_write_domain;
2762 break;
2763 case 3:
2764 start = tomoyo_builtin_manager;
2765 head.type = TOMOYO_MANAGER;
2766 head.write = tomoyo_write_manager;
2767 break;
2768 case 4:
2769 start = tomoyo_builtin_stat;
2770 head.type = TOMOYO_STAT;
2771 head.write = tomoyo_write_stat;
2772 break;
2773 }
2774 while (1) {
2775 char *end = strchr(start, '\n');
2776 if (!end)
2777 break;
2778 *end = '\0';
2779 tomoyo_normalize_line(start);
2780 head.write_buf = start;
2781 tomoyo_parse_policy(&head, start);
2782 start = end + 1;
2783 }
2784 }
2785 tomoyo_read_unlock(idx);
2786#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2787 tomoyo_check_profile();
2788#endif
2789}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * security/tomoyo/common.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8#include <linux/uaccess.h>
9#include <linux/slab.h>
10#include <linux/security.h>
11#include "common.h"
12
13/* String table for operation mode. */
14const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
15 [TOMOYO_CONFIG_DISABLED] = "disabled",
16 [TOMOYO_CONFIG_LEARNING] = "learning",
17 [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
18 [TOMOYO_CONFIG_ENFORCING] = "enforcing"
19};
20
21/* String table for /sys/kernel/security/tomoyo/profile */
22const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
23 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
24 /* CONFIG::file group */
25 [TOMOYO_MAC_FILE_EXECUTE] = "execute",
26 [TOMOYO_MAC_FILE_OPEN] = "open",
27 [TOMOYO_MAC_FILE_CREATE] = "create",
28 [TOMOYO_MAC_FILE_UNLINK] = "unlink",
29 [TOMOYO_MAC_FILE_GETATTR] = "getattr",
30 [TOMOYO_MAC_FILE_MKDIR] = "mkdir",
31 [TOMOYO_MAC_FILE_RMDIR] = "rmdir",
32 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo",
33 [TOMOYO_MAC_FILE_MKSOCK] = "mksock",
34 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate",
35 [TOMOYO_MAC_FILE_SYMLINK] = "symlink",
36 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock",
37 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar",
38 [TOMOYO_MAC_FILE_LINK] = "link",
39 [TOMOYO_MAC_FILE_RENAME] = "rename",
40 [TOMOYO_MAC_FILE_CHMOD] = "chmod",
41 [TOMOYO_MAC_FILE_CHOWN] = "chown",
42 [TOMOYO_MAC_FILE_CHGRP] = "chgrp",
43 [TOMOYO_MAC_FILE_IOCTL] = "ioctl",
44 [TOMOYO_MAC_FILE_CHROOT] = "chroot",
45 [TOMOYO_MAC_FILE_MOUNT] = "mount",
46 [TOMOYO_MAC_FILE_UMOUNT] = "unmount",
47 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
48 /* CONFIG::network group */
49 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind",
50 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen",
51 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect",
52 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind",
53 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send",
54 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind",
55 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send",
56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind",
57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen",
58 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect",
59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind",
60 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send",
61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind",
62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen",
63 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
64 /* CONFIG::misc group */
65 [TOMOYO_MAC_ENVIRON] = "env",
66 /* CONFIG group */
67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
69 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
70};
71
72/* String table for conditions. */
73const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
74 [TOMOYO_TASK_UID] = "task.uid",
75 [TOMOYO_TASK_EUID] = "task.euid",
76 [TOMOYO_TASK_SUID] = "task.suid",
77 [TOMOYO_TASK_FSUID] = "task.fsuid",
78 [TOMOYO_TASK_GID] = "task.gid",
79 [TOMOYO_TASK_EGID] = "task.egid",
80 [TOMOYO_TASK_SGID] = "task.sgid",
81 [TOMOYO_TASK_FSGID] = "task.fsgid",
82 [TOMOYO_TASK_PID] = "task.pid",
83 [TOMOYO_TASK_PPID] = "task.ppid",
84 [TOMOYO_EXEC_ARGC] = "exec.argc",
85 [TOMOYO_EXEC_ENVC] = "exec.envc",
86 [TOMOYO_TYPE_IS_SOCKET] = "socket",
87 [TOMOYO_TYPE_IS_SYMLINK] = "symlink",
88 [TOMOYO_TYPE_IS_FILE] = "file",
89 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
90 [TOMOYO_TYPE_IS_DIRECTORY] = "directory",
91 [TOMOYO_TYPE_IS_CHAR_DEV] = "char",
92 [TOMOYO_TYPE_IS_FIFO] = "fifo",
93 [TOMOYO_MODE_SETUID] = "setuid",
94 [TOMOYO_MODE_SETGID] = "setgid",
95 [TOMOYO_MODE_STICKY] = "sticky",
96 [TOMOYO_MODE_OWNER_READ] = "owner_read",
97 [TOMOYO_MODE_OWNER_WRITE] = "owner_write",
98 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
99 [TOMOYO_MODE_GROUP_READ] = "group_read",
100 [TOMOYO_MODE_GROUP_WRITE] = "group_write",
101 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
102 [TOMOYO_MODE_OTHERS_READ] = "others_read",
103 [TOMOYO_MODE_OTHERS_WRITE] = "others_write",
104 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
105 [TOMOYO_EXEC_REALPATH] = "exec.realpath",
106 [TOMOYO_SYMLINK_TARGET] = "symlink.target",
107 [TOMOYO_PATH1_UID] = "path1.uid",
108 [TOMOYO_PATH1_GID] = "path1.gid",
109 [TOMOYO_PATH1_INO] = "path1.ino",
110 [TOMOYO_PATH1_MAJOR] = "path1.major",
111 [TOMOYO_PATH1_MINOR] = "path1.minor",
112 [TOMOYO_PATH1_PERM] = "path1.perm",
113 [TOMOYO_PATH1_TYPE] = "path1.type",
114 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
115 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
116 [TOMOYO_PATH2_UID] = "path2.uid",
117 [TOMOYO_PATH2_GID] = "path2.gid",
118 [TOMOYO_PATH2_INO] = "path2.ino",
119 [TOMOYO_PATH2_MAJOR] = "path2.major",
120 [TOMOYO_PATH2_MINOR] = "path2.minor",
121 [TOMOYO_PATH2_PERM] = "path2.perm",
122 [TOMOYO_PATH2_TYPE] = "path2.type",
123 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
124 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
125 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
126 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
127 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
128 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
129 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
130 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
131 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
132 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
133};
134
135/* String table for PREFERENCE keyword. */
136static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
137 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
138 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
139};
140
141/* String table for path operation. */
142const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
143 [TOMOYO_TYPE_EXECUTE] = "execute",
144 [TOMOYO_TYPE_READ] = "read",
145 [TOMOYO_TYPE_WRITE] = "write",
146 [TOMOYO_TYPE_APPEND] = "append",
147 [TOMOYO_TYPE_UNLINK] = "unlink",
148 [TOMOYO_TYPE_GETATTR] = "getattr",
149 [TOMOYO_TYPE_RMDIR] = "rmdir",
150 [TOMOYO_TYPE_TRUNCATE] = "truncate",
151 [TOMOYO_TYPE_SYMLINK] = "symlink",
152 [TOMOYO_TYPE_CHROOT] = "chroot",
153 [TOMOYO_TYPE_UMOUNT] = "unmount",
154};
155
156/* String table for socket's operation. */
157const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
158 [TOMOYO_NETWORK_BIND] = "bind",
159 [TOMOYO_NETWORK_LISTEN] = "listen",
160 [TOMOYO_NETWORK_CONNECT] = "connect",
161 [TOMOYO_NETWORK_SEND] = "send",
162};
163
164/* String table for categories. */
165static const char * const tomoyo_category_keywords
166[TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
167 [TOMOYO_MAC_CATEGORY_FILE] = "file",
168 [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
169 [TOMOYO_MAC_CATEGORY_MISC] = "misc",
170};
171
172/* Permit policy management by non-root user? */
173static bool tomoyo_manage_by_non_root;
174
175/* Utility functions. */
176
177/**
178 * tomoyo_yesno - Return "yes" or "no".
179 *
180 * @value: Bool value.
181 */
182const char *tomoyo_yesno(const unsigned int value)
183{
184 return value ? "yes" : "no";
185}
186
187/**
188 * tomoyo_addprintf - strncat()-like-snprintf().
189 *
190 * @buffer: Buffer to write to. Must be '\0'-terminated.
191 * @len: Size of @buffer.
192 * @fmt: The printf()'s format string, followed by parameters.
193 *
194 * Returns nothing.
195 */
196static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
197{
198 va_list args;
199 const int pos = strlen(buffer);
200
201 va_start(args, fmt);
202 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
203 va_end(args);
204}
205
206/**
207 * tomoyo_flush - Flush queued string to userspace's buffer.
208 *
209 * @head: Pointer to "struct tomoyo_io_buffer".
210 *
211 * Returns true if all data was flushed, false otherwise.
212 */
213static bool tomoyo_flush(struct tomoyo_io_buffer *head)
214{
215 while (head->r.w_pos) {
216 const char *w = head->r.w[0];
217 size_t len = strlen(w);
218
219 if (len) {
220 if (len > head->read_user_buf_avail)
221 len = head->read_user_buf_avail;
222 if (!len)
223 return false;
224 if (copy_to_user(head->read_user_buf, w, len))
225 return false;
226 head->read_user_buf_avail -= len;
227 head->read_user_buf += len;
228 w += len;
229 }
230 head->r.w[0] = w;
231 if (*w)
232 return false;
233 /* Add '\0' for audit logs and query. */
234 if (head->poll) {
235 if (!head->read_user_buf_avail ||
236 copy_to_user(head->read_user_buf, "", 1))
237 return false;
238 head->read_user_buf_avail--;
239 head->read_user_buf++;
240 }
241 head->r.w_pos--;
242 for (len = 0; len < head->r.w_pos; len++)
243 head->r.w[len] = head->r.w[len + 1];
244 }
245 head->r.avail = 0;
246 return true;
247}
248
249/**
250 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
251 *
252 * @head: Pointer to "struct tomoyo_io_buffer".
253 * @string: String to print.
254 *
255 * Note that @string has to be kept valid until @head is kfree()d.
256 * This means that char[] allocated on stack memory cannot be passed to
257 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
258 */
259static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
260{
261 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
262 head->r.w[head->r.w_pos++] = string;
263 tomoyo_flush(head);
264 } else
265 WARN_ON(1);
266}
267
268static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
269 ...) __printf(2, 3);
270
271/**
272 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
273 *
274 * @head: Pointer to "struct tomoyo_io_buffer".
275 * @fmt: The printf()'s format string, followed by parameters.
276 */
277static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
278 ...)
279{
280 va_list args;
281 size_t len;
282 size_t pos = head->r.avail;
283 int size = head->readbuf_size - pos;
284
285 if (size <= 0)
286 return;
287 va_start(args, fmt);
288 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
289 va_end(args);
290 if (pos + len >= head->readbuf_size) {
291 WARN_ON(1);
292 return;
293 }
294 head->r.avail += len;
295 tomoyo_set_string(head, head->read_buf + pos);
296}
297
298/**
299 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
300 *
301 * @head: Pointer to "struct tomoyo_io_buffer".
302 *
303 * Returns nothing.
304 */
305static void tomoyo_set_space(struct tomoyo_io_buffer *head)
306{
307 tomoyo_set_string(head, " ");
308}
309
310/**
311 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
312 *
313 * @head: Pointer to "struct tomoyo_io_buffer".
314 *
315 * Returns nothing.
316 */
317static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
318{
319 tomoyo_set_string(head, "\n");
320 return !head->r.w_pos;
321}
322
323/**
324 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
325 *
326 * @head: Pointer to "struct tomoyo_io_buffer".
327 *
328 * Returns nothing.
329 */
330static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
331{
332 tomoyo_set_string(head, "/");
333}
334
335/* List of namespaces. */
336LIST_HEAD(tomoyo_namespace_list);
337/* True if namespace other than tomoyo_kernel_namespace is defined. */
338static bool tomoyo_namespace_enabled;
339
340/**
341 * tomoyo_init_policy_namespace - Initialize namespace.
342 *
343 * @ns: Pointer to "struct tomoyo_policy_namespace".
344 *
345 * Returns nothing.
346 */
347void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
348{
349 unsigned int idx;
350
351 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
352 INIT_LIST_HEAD(&ns->acl_group[idx]);
353 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
354 INIT_LIST_HEAD(&ns->group_list[idx]);
355 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
356 INIT_LIST_HEAD(&ns->policy_list[idx]);
357 ns->profile_version = 20150505;
358 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
359 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
360}
361
362/**
363 * tomoyo_print_namespace - Print namespace header.
364 *
365 * @head: Pointer to "struct tomoyo_io_buffer".
366 *
367 * Returns nothing.
368 */
369static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
370{
371 if (!tomoyo_namespace_enabled)
372 return;
373 tomoyo_set_string(head,
374 container_of(head->r.ns,
375 struct tomoyo_policy_namespace,
376 namespace_list)->name);
377 tomoyo_set_space(head);
378}
379
380/**
381 * tomoyo_print_name_union - Print a tomoyo_name_union.
382 *
383 * @head: Pointer to "struct tomoyo_io_buffer".
384 * @ptr: Pointer to "struct tomoyo_name_union".
385 */
386static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
387 const struct tomoyo_name_union *ptr)
388{
389 tomoyo_set_space(head);
390 if (ptr->group) {
391 tomoyo_set_string(head, "@");
392 tomoyo_set_string(head, ptr->group->group_name->name);
393 } else {
394 tomoyo_set_string(head, ptr->filename->name);
395 }
396}
397
398/**
399 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
400 *
401 * @head: Pointer to "struct tomoyo_io_buffer".
402 * @ptr: Pointer to "struct tomoyo_name_union".
403 *
404 * Returns nothing.
405 */
406static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
407 const struct tomoyo_name_union *ptr)
408{
409 if (ptr->group) {
410 tomoyo_set_string(head, "@");
411 tomoyo_set_string(head, ptr->group->group_name->name);
412 } else {
413 tomoyo_set_string(head, "\"");
414 tomoyo_set_string(head, ptr->filename->name);
415 tomoyo_set_string(head, "\"");
416 }
417}
418
419/**
420 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
421 *
422 * @head: Pointer to "struct tomoyo_io_buffer".
423 * @ptr: Pointer to "struct tomoyo_number_union".
424 *
425 * Returns nothing.
426 */
427static void tomoyo_print_number_union_nospace
428(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
429{
430 if (ptr->group) {
431 tomoyo_set_string(head, "@");
432 tomoyo_set_string(head, ptr->group->group_name->name);
433 } else {
434 int i;
435 unsigned long min = ptr->values[0];
436 const unsigned long max = ptr->values[1];
437 u8 min_type = ptr->value_type[0];
438 const u8 max_type = ptr->value_type[1];
439 char buffer[128];
440
441 buffer[0] = '\0';
442 for (i = 0; i < 2; i++) {
443 switch (min_type) {
444 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
445 tomoyo_addprintf(buffer, sizeof(buffer),
446 "0x%lX", min);
447 break;
448 case TOMOYO_VALUE_TYPE_OCTAL:
449 tomoyo_addprintf(buffer, sizeof(buffer),
450 "0%lo", min);
451 break;
452 default:
453 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
454 min);
455 break;
456 }
457 if (min == max && min_type == max_type)
458 break;
459 tomoyo_addprintf(buffer, sizeof(buffer), "-");
460 min_type = max_type;
461 min = max;
462 }
463 tomoyo_io_printf(head, "%s", buffer);
464 }
465}
466
467/**
468 * tomoyo_print_number_union - Print a tomoyo_number_union.
469 *
470 * @head: Pointer to "struct tomoyo_io_buffer".
471 * @ptr: Pointer to "struct tomoyo_number_union".
472 *
473 * Returns nothing.
474 */
475static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
476 const struct tomoyo_number_union *ptr)
477{
478 tomoyo_set_space(head);
479 tomoyo_print_number_union_nospace(head, ptr);
480}
481
482/**
483 * tomoyo_assign_profile - Create a new profile.
484 *
485 * @ns: Pointer to "struct tomoyo_policy_namespace".
486 * @profile: Profile number to create.
487 *
488 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
489 */
490static struct tomoyo_profile *tomoyo_assign_profile
491(struct tomoyo_policy_namespace *ns, const unsigned int profile)
492{
493 struct tomoyo_profile *ptr;
494 struct tomoyo_profile *entry;
495
496 if (profile >= TOMOYO_MAX_PROFILES)
497 return NULL;
498 ptr = ns->profile_ptr[profile];
499 if (ptr)
500 return ptr;
501 entry = kzalloc(sizeof(*entry), GFP_NOFS);
502 if (mutex_lock_interruptible(&tomoyo_policy_lock))
503 goto out;
504 ptr = ns->profile_ptr[profile];
505 if (!ptr && tomoyo_memory_ok(entry)) {
506 ptr = entry;
507 ptr->default_config = TOMOYO_CONFIG_DISABLED |
508 TOMOYO_CONFIG_WANT_GRANT_LOG |
509 TOMOYO_CONFIG_WANT_REJECT_LOG;
510 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
511 sizeof(ptr->config));
512 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
513 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
514 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
515 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
516 mb(); /* Avoid out-of-order execution. */
517 ns->profile_ptr[profile] = ptr;
518 entry = NULL;
519 }
520 mutex_unlock(&tomoyo_policy_lock);
521 out:
522 kfree(entry);
523 return ptr;
524}
525
526/**
527 * tomoyo_profile - Find a profile.
528 *
529 * @ns: Pointer to "struct tomoyo_policy_namespace".
530 * @profile: Profile number to find.
531 *
532 * Returns pointer to "struct tomoyo_profile".
533 */
534struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
535 const u8 profile)
536{
537 static struct tomoyo_profile tomoyo_null_profile;
538 struct tomoyo_profile *ptr = ns->profile_ptr[profile];
539
540 if (!ptr)
541 ptr = &tomoyo_null_profile;
542 return ptr;
543}
544
545/**
546 * tomoyo_find_yesno - Find values for specified keyword.
547 *
548 * @string: String to check.
549 * @find: Name of keyword.
550 *
551 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
552 */
553static s8 tomoyo_find_yesno(const char *string, const char *find)
554{
555 const char *cp = strstr(string, find);
556
557 if (cp) {
558 cp += strlen(find);
559 if (!strncmp(cp, "=yes", 4))
560 return 1;
561 else if (!strncmp(cp, "=no", 3))
562 return 0;
563 }
564 return -1;
565}
566
567/**
568 * tomoyo_set_uint - Set value for specified preference.
569 *
570 * @i: Pointer to "unsigned int".
571 * @string: String to check.
572 * @find: Name of keyword.
573 *
574 * Returns nothing.
575 */
576static void tomoyo_set_uint(unsigned int *i, const char *string,
577 const char *find)
578{
579 const char *cp = strstr(string, find);
580
581 if (cp)
582 sscanf(cp + strlen(find), "=%u", i);
583}
584
585/**
586 * tomoyo_set_mode - Set mode for specified profile.
587 *
588 * @name: Name of functionality.
589 * @value: Mode for @name.
590 * @profile: Pointer to "struct tomoyo_profile".
591 *
592 * Returns 0 on success, negative value otherwise.
593 */
594static int tomoyo_set_mode(char *name, const char *value,
595 struct tomoyo_profile *profile)
596{
597 u8 i;
598 u8 config;
599
600 if (!strcmp(name, "CONFIG")) {
601 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
602 config = profile->default_config;
603 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
604 config = 0;
605 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
606 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
607 int len = 0;
608
609 if (i < TOMOYO_MAX_MAC_INDEX) {
610 const u8 c = tomoyo_index2category[i];
611 const char *category =
612 tomoyo_category_keywords[c];
613
614 len = strlen(category);
615 if (strncmp(name, category, len) ||
616 name[len++] != ':' || name[len++] != ':')
617 continue;
618 }
619 if (strcmp(name + len, tomoyo_mac_keywords[i]))
620 continue;
621 config = profile->config[i];
622 break;
623 }
624 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
625 return -EINVAL;
626 } else {
627 return -EINVAL;
628 }
629 if (strstr(value, "use_default")) {
630 config = TOMOYO_CONFIG_USE_DEFAULT;
631 } else {
632 u8 mode;
633
634 for (mode = 0; mode < 4; mode++)
635 if (strstr(value, tomoyo_mode[mode]))
636 /*
637 * Update lower 3 bits in order to distinguish
638 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
639 */
640 config = (config & ~7) | mode;
641 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
642 switch (tomoyo_find_yesno(value, "grant_log")) {
643 case 1:
644 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
645 break;
646 case 0:
647 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
648 break;
649 }
650 switch (tomoyo_find_yesno(value, "reject_log")) {
651 case 1:
652 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
653 break;
654 case 0:
655 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
656 break;
657 }
658 }
659 }
660 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
661 profile->config[i] = config;
662 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
663 profile->default_config = config;
664 return 0;
665}
666
667/**
668 * tomoyo_write_profile - Write profile table.
669 *
670 * @head: Pointer to "struct tomoyo_io_buffer".
671 *
672 * Returns 0 on success, negative value otherwise.
673 */
674static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
675{
676 char *data = head->write_buf;
677 unsigned int i;
678 char *cp;
679 struct tomoyo_profile *profile;
680
681 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
682 == 1)
683 return 0;
684 i = simple_strtoul(data, &cp, 10);
685 if (*cp != '-')
686 return -EINVAL;
687 data = cp + 1;
688 profile = tomoyo_assign_profile(head->w.ns, i);
689 if (!profile)
690 return -EINVAL;
691 cp = strchr(data, '=');
692 if (!cp)
693 return -EINVAL;
694 *cp++ = '\0';
695 if (!strcmp(data, "COMMENT")) {
696 static DEFINE_SPINLOCK(lock);
697 const struct tomoyo_path_info *new_comment
698 = tomoyo_get_name(cp);
699 const struct tomoyo_path_info *old_comment;
700
701 if (!new_comment)
702 return -ENOMEM;
703 spin_lock(&lock);
704 old_comment = profile->comment;
705 profile->comment = new_comment;
706 spin_unlock(&lock);
707 tomoyo_put_name(old_comment);
708 return 0;
709 }
710 if (!strcmp(data, "PREFERENCE")) {
711 for (i = 0; i < TOMOYO_MAX_PREF; i++)
712 tomoyo_set_uint(&profile->pref[i], cp,
713 tomoyo_pref_keywords[i]);
714 return 0;
715 }
716 return tomoyo_set_mode(data, cp, profile);
717}
718
719/**
720 * tomoyo_print_config - Print mode for specified functionality.
721 *
722 * @head: Pointer to "struct tomoyo_io_buffer".
723 * @config: Mode for that functionality.
724 *
725 * Returns nothing.
726 *
727 * Caller prints functionality's name.
728 */
729static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
730{
731 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
732 tomoyo_mode[config & 3],
733 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
734 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
735}
736
737/**
738 * tomoyo_read_profile - Read profile table.
739 *
740 * @head: Pointer to "struct tomoyo_io_buffer".
741 *
742 * Returns nothing.
743 */
744static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
745{
746 u8 index;
747 struct tomoyo_policy_namespace *ns =
748 container_of(head->r.ns, typeof(*ns), namespace_list);
749 const struct tomoyo_profile *profile;
750
751 if (head->r.eof)
752 return;
753 next:
754 index = head->r.index;
755 profile = ns->profile_ptr[index];
756 switch (head->r.step) {
757 case 0:
758 tomoyo_print_namespace(head);
759 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
760 ns->profile_version);
761 head->r.step++;
762 break;
763 case 1:
764 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
765 head->r.index++)
766 if (ns->profile_ptr[head->r.index])
767 break;
768 if (head->r.index == TOMOYO_MAX_PROFILES) {
769 head->r.eof = true;
770 return;
771 }
772 head->r.step++;
773 break;
774 case 2:
775 {
776 u8 i;
777 const struct tomoyo_path_info *comment =
778 profile->comment;
779
780 tomoyo_print_namespace(head);
781 tomoyo_io_printf(head, "%u-COMMENT=", index);
782 tomoyo_set_string(head, comment ? comment->name : "");
783 tomoyo_set_lf(head);
784 tomoyo_print_namespace(head);
785 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
786 for (i = 0; i < TOMOYO_MAX_PREF; i++)
787 tomoyo_io_printf(head, "%s=%u ",
788 tomoyo_pref_keywords[i],
789 profile->pref[i]);
790 tomoyo_set_string(head, "}\n");
791 head->r.step++;
792 }
793 break;
794 case 3:
795 {
796 tomoyo_print_namespace(head);
797 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
798 tomoyo_print_config(head, profile->default_config);
799 head->r.bit = 0;
800 head->r.step++;
801 }
802 break;
803 case 4:
804 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
805 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
806 const u8 i = head->r.bit;
807 const u8 config = profile->config[i];
808
809 if (config == TOMOYO_CONFIG_USE_DEFAULT)
810 continue;
811 tomoyo_print_namespace(head);
812 if (i < TOMOYO_MAX_MAC_INDEX)
813 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
814 index,
815 tomoyo_category_keywords
816 [tomoyo_index2category[i]],
817 tomoyo_mac_keywords[i]);
818 else
819 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
820 tomoyo_mac_keywords[i]);
821 tomoyo_print_config(head, config);
822 head->r.bit++;
823 break;
824 }
825 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
826 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
827 head->r.index++;
828 head->r.step = 1;
829 }
830 break;
831 }
832 if (tomoyo_flush(head))
833 goto next;
834}
835
836/**
837 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
838 *
839 * @a: Pointer to "struct tomoyo_acl_head".
840 * @b: Pointer to "struct tomoyo_acl_head".
841 *
842 * Returns true if @a == @b, false otherwise.
843 */
844static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
845 const struct tomoyo_acl_head *b)
846{
847 return container_of(a, struct tomoyo_manager, head)->manager ==
848 container_of(b, struct tomoyo_manager, head)->manager;
849}
850
851/**
852 * tomoyo_update_manager_entry - Add a manager entry.
853 *
854 * @manager: The path to manager or the domainnamme.
855 * @is_delete: True if it is a delete request.
856 *
857 * Returns 0 on success, negative value otherwise.
858 *
859 * Caller holds tomoyo_read_lock().
860 */
861static int tomoyo_update_manager_entry(const char *manager,
862 const bool is_delete)
863{
864 struct tomoyo_manager e = { };
865 struct tomoyo_acl_param param = {
866 /* .ns = &tomoyo_kernel_namespace, */
867 .is_delete = is_delete,
868 .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
869 };
870 int error = is_delete ? -ENOENT : -ENOMEM;
871
872 if (!tomoyo_correct_domain(manager) &&
873 !tomoyo_correct_word(manager))
874 return -EINVAL;
875 e.manager = tomoyo_get_name(manager);
876 if (e.manager) {
877 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m,
878 tomoyo_same_manager);
879 tomoyo_put_name(e.manager);
880 }
881 return error;
882}
883
884/**
885 * tomoyo_write_manager - Write manager policy.
886 *
887 * @head: Pointer to "struct tomoyo_io_buffer".
888 *
889 * Returns 0 on success, negative value otherwise.
890 *
891 * Caller holds tomoyo_read_lock().
892 */
893static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
894{
895 char *data = head->write_buf;
896
897 if (!strcmp(data, "manage_by_non_root")) {
898 tomoyo_manage_by_non_root = !head->w.is_delete;
899 return 0;
900 }
901 return tomoyo_update_manager_entry(data, head->w.is_delete);
902}
903
904/**
905 * tomoyo_read_manager - Read manager policy.
906 *
907 * @head: Pointer to "struct tomoyo_io_buffer".
908 *
909 * Caller holds tomoyo_read_lock().
910 */
911static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
912{
913 if (head->r.eof)
914 return;
915 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
916 struct tomoyo_manager *ptr =
917 list_entry(head->r.acl, typeof(*ptr), head.list);
918
919 if (ptr->head.is_deleted)
920 continue;
921 if (!tomoyo_flush(head))
922 return;
923 tomoyo_set_string(head, ptr->manager->name);
924 tomoyo_set_lf(head);
925 }
926 head->r.eof = true;
927}
928
929/**
930 * tomoyo_manager - Check whether the current process is a policy manager.
931 *
932 * Returns true if the current process is permitted to modify policy
933 * via /sys/kernel/security/tomoyo/ interface.
934 *
935 * Caller holds tomoyo_read_lock().
936 */
937static bool tomoyo_manager(void)
938{
939 struct tomoyo_manager *ptr;
940 const char *exe;
941 const struct task_struct *task = current;
942 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
943 bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
944
945 if (!tomoyo_policy_loaded)
946 return true;
947 if (!tomoyo_manage_by_non_root &&
948 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) ||
949 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
950 return false;
951 exe = tomoyo_get_exe();
952 if (!exe)
953 return false;
954 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
955 srcu_read_lock_held(&tomoyo_ss)) {
956 if (!ptr->head.is_deleted &&
957 (!tomoyo_pathcmp(domainname, ptr->manager) ||
958 !strcmp(exe, ptr->manager->name))) {
959 found = true;
960 break;
961 }
962 }
963 if (!found) { /* Reduce error messages. */
964 static pid_t last_pid;
965 const pid_t pid = current->pid;
966
967 if (last_pid != pid) {
968 pr_warn("%s ( %s ) is not permitted to update policies.\n",
969 domainname->name, exe);
970 last_pid = pid;
971 }
972 }
973 kfree(exe);
974 return found;
975}
976
977static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
978(unsigned int serial);
979
980/**
981 * tomoyo_select_domain - Parse select command.
982 *
983 * @head: Pointer to "struct tomoyo_io_buffer".
984 * @data: String to parse.
985 *
986 * Returns true on success, false otherwise.
987 *
988 * Caller holds tomoyo_read_lock().
989 */
990static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
991 const char *data)
992{
993 unsigned int pid;
994 struct tomoyo_domain_info *domain = NULL;
995 bool global_pid = false;
996
997 if (strncmp(data, "select ", 7))
998 return false;
999 data += 7;
1000 if (sscanf(data, "pid=%u", &pid) == 1 ||
1001 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
1002 struct task_struct *p;
1003
1004 rcu_read_lock();
1005 if (global_pid)
1006 p = find_task_by_pid_ns(pid, &init_pid_ns);
1007 else
1008 p = find_task_by_vpid(pid);
1009 if (p)
1010 domain = tomoyo_task(p)->domain_info;
1011 rcu_read_unlock();
1012 } else if (!strncmp(data, "domain=", 7)) {
1013 if (tomoyo_domain_def(data + 7))
1014 domain = tomoyo_find_domain(data + 7);
1015 } else if (sscanf(data, "Q=%u", &pid) == 1) {
1016 domain = tomoyo_find_domain_by_qid(pid);
1017 } else
1018 return false;
1019 head->w.domain = domain;
1020 /* Accessing read_buf is safe because head->io_sem is held. */
1021 if (!head->read_buf)
1022 return true; /* Do nothing if open(O_WRONLY). */
1023 memset(&head->r, 0, sizeof(head->r));
1024 head->r.print_this_domain_only = true;
1025 if (domain)
1026 head->r.domain = &domain->list;
1027 else
1028 head->r.eof = true;
1029 tomoyo_io_printf(head, "# select %s\n", data);
1030 if (domain && domain->is_deleted)
1031 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1032 return true;
1033}
1034
1035/**
1036 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1037 *
1038 * @a: Pointer to "struct tomoyo_acl_info".
1039 * @b: Pointer to "struct tomoyo_acl_info".
1040 *
1041 * Returns true if @a == @b, false otherwise.
1042 */
1043static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1044 const struct tomoyo_acl_info *b)
1045{
1046 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1047 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1048
1049 return p1->domainname == p2->domainname;
1050}
1051
1052/**
1053 * tomoyo_write_task - Update task related list.
1054 *
1055 * @param: Pointer to "struct tomoyo_acl_param".
1056 *
1057 * Returns 0 on success, negative value otherwise.
1058 *
1059 * Caller holds tomoyo_read_lock().
1060 */
1061static int tomoyo_write_task(struct tomoyo_acl_param *param)
1062{
1063 int error = -EINVAL;
1064
1065 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
1066 struct tomoyo_task_acl e = {
1067 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1068 .domainname = tomoyo_get_domainname(param),
1069 };
1070
1071 if (e.domainname)
1072 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1073 tomoyo_same_task_acl,
1074 NULL);
1075 tomoyo_put_name(e.domainname);
1076 }
1077 return error;
1078}
1079
1080/**
1081 * tomoyo_delete_domain - Delete a domain.
1082 *
1083 * @domainname: The name of domain.
1084 *
1085 * Returns 0 on success, negative value otherwise.
1086 *
1087 * Caller holds tomoyo_read_lock().
1088 */
1089static int tomoyo_delete_domain(char *domainname)
1090{
1091 struct tomoyo_domain_info *domain;
1092 struct tomoyo_path_info name;
1093
1094 name.name = domainname;
1095 tomoyo_fill_path_info(&name);
1096 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1097 return -EINTR;
1098 /* Is there an active domain? */
1099 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1100 srcu_read_lock_held(&tomoyo_ss)) {
1101 /* Never delete tomoyo_kernel_domain */
1102 if (domain == &tomoyo_kernel_domain)
1103 continue;
1104 if (domain->is_deleted ||
1105 tomoyo_pathcmp(domain->domainname, &name))
1106 continue;
1107 domain->is_deleted = true;
1108 break;
1109 }
1110 mutex_unlock(&tomoyo_policy_lock);
1111 return 0;
1112}
1113
1114/**
1115 * tomoyo_write_domain2 - Write domain policy.
1116 *
1117 * @ns: Pointer to "struct tomoyo_policy_namespace".
1118 * @list: Pointer to "struct list_head".
1119 * @data: Policy to be interpreted.
1120 * @is_delete: True if it is a delete request.
1121 *
1122 * Returns 0 on success, negative value otherwise.
1123 *
1124 * Caller holds tomoyo_read_lock().
1125 */
1126static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1127 struct list_head *list, char *data,
1128 const bool is_delete)
1129{
1130 struct tomoyo_acl_param param = {
1131 .ns = ns,
1132 .list = list,
1133 .data = data,
1134 .is_delete = is_delete,
1135 };
1136 static const struct {
1137 const char *keyword;
1138 int (*write)(struct tomoyo_acl_param *param);
1139 } tomoyo_callback[5] = {
1140 { "file ", tomoyo_write_file },
1141 { "network inet ", tomoyo_write_inet_network },
1142 { "network unix ", tomoyo_write_unix_network },
1143 { "misc ", tomoyo_write_misc },
1144 { "task ", tomoyo_write_task },
1145 };
1146 u8 i;
1147
1148 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1149 if (!tomoyo_str_starts(¶m.data,
1150 tomoyo_callback[i].keyword))
1151 continue;
1152 return tomoyo_callback[i].write(¶m);
1153 }
1154 return -EINVAL;
1155}
1156
1157/* String table for domain flags. */
1158const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1159 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1160 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1161};
1162
1163/**
1164 * tomoyo_write_domain - Write domain policy.
1165 *
1166 * @head: Pointer to "struct tomoyo_io_buffer".
1167 *
1168 * Returns 0 on success, negative value otherwise.
1169 *
1170 * Caller holds tomoyo_read_lock().
1171 */
1172static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1173{
1174 char *data = head->write_buf;
1175 struct tomoyo_policy_namespace *ns;
1176 struct tomoyo_domain_info *domain = head->w.domain;
1177 const bool is_delete = head->w.is_delete;
1178 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1179 unsigned int idx;
1180
1181 if (*data == '<') {
1182 int ret = 0;
1183
1184 domain = NULL;
1185 if (is_delete)
1186 ret = tomoyo_delete_domain(data);
1187 else if (is_select)
1188 domain = tomoyo_find_domain(data);
1189 else
1190 domain = tomoyo_assign_domain(data, false);
1191 head->w.domain = domain;
1192 return ret;
1193 }
1194 if (!domain)
1195 return -EINVAL;
1196 ns = domain->ns;
1197 if (sscanf(data, "use_profile %u", &idx) == 1
1198 && idx < TOMOYO_MAX_PROFILES) {
1199 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1200 if (!is_delete)
1201 domain->profile = (u8) idx;
1202 return 0;
1203 }
1204 if (sscanf(data, "use_group %u\n", &idx) == 1
1205 && idx < TOMOYO_MAX_ACL_GROUPS) {
1206 if (!is_delete)
1207 set_bit(idx, domain->group);
1208 else
1209 clear_bit(idx, domain->group);
1210 return 0;
1211 }
1212 for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1213 const char *cp = tomoyo_dif[idx];
1214
1215 if (strncmp(data, cp, strlen(cp) - 1))
1216 continue;
1217 domain->flags[idx] = !is_delete;
1218 return 0;
1219 }
1220 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1221 is_delete);
1222}
1223
1224/**
1225 * tomoyo_print_condition - Print condition part.
1226 *
1227 * @head: Pointer to "struct tomoyo_io_buffer".
1228 * @cond: Pointer to "struct tomoyo_condition".
1229 *
1230 * Returns true on success, false otherwise.
1231 */
1232static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1233 const struct tomoyo_condition *cond)
1234{
1235 switch (head->r.cond_step) {
1236 case 0:
1237 head->r.cond_index = 0;
1238 head->r.cond_step++;
1239 if (cond->transit) {
1240 tomoyo_set_space(head);
1241 tomoyo_set_string(head, cond->transit->name);
1242 }
1243 fallthrough;
1244 case 1:
1245 {
1246 const u16 condc = cond->condc;
1247 const struct tomoyo_condition_element *condp =
1248 (typeof(condp)) (cond + 1);
1249 const struct tomoyo_number_union *numbers_p =
1250 (typeof(numbers_p)) (condp + condc);
1251 const struct tomoyo_name_union *names_p =
1252 (typeof(names_p))
1253 (numbers_p + cond->numbers_count);
1254 const struct tomoyo_argv *argv =
1255 (typeof(argv)) (names_p + cond->names_count);
1256 const struct tomoyo_envp *envp =
1257 (typeof(envp)) (argv + cond->argc);
1258 u16 skip;
1259
1260 for (skip = 0; skip < head->r.cond_index; skip++) {
1261 const u8 left = condp->left;
1262 const u8 right = condp->right;
1263
1264 condp++;
1265 switch (left) {
1266 case TOMOYO_ARGV_ENTRY:
1267 argv++;
1268 continue;
1269 case TOMOYO_ENVP_ENTRY:
1270 envp++;
1271 continue;
1272 case TOMOYO_NUMBER_UNION:
1273 numbers_p++;
1274 break;
1275 }
1276 switch (right) {
1277 case TOMOYO_NAME_UNION:
1278 names_p++;
1279 break;
1280 case TOMOYO_NUMBER_UNION:
1281 numbers_p++;
1282 break;
1283 }
1284 }
1285 while (head->r.cond_index < condc) {
1286 const u8 match = condp->equals;
1287 const u8 left = condp->left;
1288 const u8 right = condp->right;
1289
1290 if (!tomoyo_flush(head))
1291 return false;
1292 condp++;
1293 head->r.cond_index++;
1294 tomoyo_set_space(head);
1295 switch (left) {
1296 case TOMOYO_ARGV_ENTRY:
1297 tomoyo_io_printf(head,
1298 "exec.argv[%lu]%s=\"",
1299 argv->index, argv->is_not ? "!" : "");
1300 tomoyo_set_string(head,
1301 argv->value->name);
1302 tomoyo_set_string(head, "\"");
1303 argv++;
1304 continue;
1305 case TOMOYO_ENVP_ENTRY:
1306 tomoyo_set_string(head,
1307 "exec.envp[\"");
1308 tomoyo_set_string(head,
1309 envp->name->name);
1310 tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1311 if (envp->value) {
1312 tomoyo_set_string(head, "\"");
1313 tomoyo_set_string(head, envp->value->name);
1314 tomoyo_set_string(head, "\"");
1315 } else {
1316 tomoyo_set_string(head,
1317 "NULL");
1318 }
1319 envp++;
1320 continue;
1321 case TOMOYO_NUMBER_UNION:
1322 tomoyo_print_number_union_nospace
1323 (head, numbers_p++);
1324 break;
1325 default:
1326 tomoyo_set_string(head,
1327 tomoyo_condition_keyword[left]);
1328 break;
1329 }
1330 tomoyo_set_string(head, match ? "=" : "!=");
1331 switch (right) {
1332 case TOMOYO_NAME_UNION:
1333 tomoyo_print_name_union_quoted
1334 (head, names_p++);
1335 break;
1336 case TOMOYO_NUMBER_UNION:
1337 tomoyo_print_number_union_nospace
1338 (head, numbers_p++);
1339 break;
1340 default:
1341 tomoyo_set_string(head,
1342 tomoyo_condition_keyword[right]);
1343 break;
1344 }
1345 }
1346 }
1347 head->r.cond_step++;
1348 fallthrough;
1349 case 2:
1350 if (!tomoyo_flush(head))
1351 break;
1352 head->r.cond_step++;
1353 fallthrough;
1354 case 3:
1355 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1356 tomoyo_io_printf(head, " grant_log=%s",
1357 tomoyo_yesno(cond->grant_log ==
1358 TOMOYO_GRANTLOG_YES));
1359 tomoyo_set_lf(head);
1360 return true;
1361 }
1362 return false;
1363}
1364
1365/**
1366 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1367 *
1368 * @head: Pointer to "struct tomoyo_io_buffer".
1369 * @category: Category name.
1370 *
1371 * Returns nothing.
1372 */
1373static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1374 const char *category)
1375{
1376 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1377 tomoyo_print_namespace(head);
1378 tomoyo_io_printf(head, "acl_group %u ",
1379 head->r.acl_group_index);
1380 }
1381 tomoyo_set_string(head, category);
1382}
1383
1384/**
1385 * tomoyo_print_entry - Print an ACL entry.
1386 *
1387 * @head: Pointer to "struct tomoyo_io_buffer".
1388 * @acl: Pointer to an ACL entry.
1389 *
1390 * Returns true on success, false otherwise.
1391 */
1392static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1393 struct tomoyo_acl_info *acl)
1394{
1395 const u8 acl_type = acl->type;
1396 bool first = true;
1397 u8 bit;
1398
1399 if (head->r.print_cond_part)
1400 goto print_cond_part;
1401 if (acl->is_deleted)
1402 return true;
1403 if (!tomoyo_flush(head))
1404 return false;
1405 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1406 struct tomoyo_path_acl *ptr =
1407 container_of(acl, typeof(*ptr), head);
1408 const u16 perm = ptr->perm;
1409
1410 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1411 if (!(perm & (1 << bit)))
1412 continue;
1413 if (head->r.print_transition_related_only &&
1414 bit != TOMOYO_TYPE_EXECUTE)
1415 continue;
1416 if (first) {
1417 tomoyo_set_group(head, "file ");
1418 first = false;
1419 } else {
1420 tomoyo_set_slash(head);
1421 }
1422 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1423 }
1424 if (first)
1425 return true;
1426 tomoyo_print_name_union(head, &ptr->name);
1427 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1428 struct tomoyo_task_acl *ptr =
1429 container_of(acl, typeof(*ptr), head);
1430
1431 tomoyo_set_group(head, "task ");
1432 tomoyo_set_string(head, "manual_domain_transition ");
1433 tomoyo_set_string(head, ptr->domainname->name);
1434 } else if (head->r.print_transition_related_only) {
1435 return true;
1436 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1437 struct tomoyo_path2_acl *ptr =
1438 container_of(acl, typeof(*ptr), head);
1439 const u8 perm = ptr->perm;
1440
1441 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1442 if (!(perm & (1 << bit)))
1443 continue;
1444 if (first) {
1445 tomoyo_set_group(head, "file ");
1446 first = false;
1447 } else {
1448 tomoyo_set_slash(head);
1449 }
1450 tomoyo_set_string(head, tomoyo_mac_keywords
1451 [tomoyo_pp2mac[bit]]);
1452 }
1453 if (first)
1454 return true;
1455 tomoyo_print_name_union(head, &ptr->name1);
1456 tomoyo_print_name_union(head, &ptr->name2);
1457 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1458 struct tomoyo_path_number_acl *ptr =
1459 container_of(acl, typeof(*ptr), head);
1460 const u8 perm = ptr->perm;
1461
1462 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1463 if (!(perm & (1 << bit)))
1464 continue;
1465 if (first) {
1466 tomoyo_set_group(head, "file ");
1467 first = false;
1468 } else {
1469 tomoyo_set_slash(head);
1470 }
1471 tomoyo_set_string(head, tomoyo_mac_keywords
1472 [tomoyo_pn2mac[bit]]);
1473 }
1474 if (first)
1475 return true;
1476 tomoyo_print_name_union(head, &ptr->name);
1477 tomoyo_print_number_union(head, &ptr->number);
1478 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1479 struct tomoyo_mkdev_acl *ptr =
1480 container_of(acl, typeof(*ptr), head);
1481 const u8 perm = ptr->perm;
1482
1483 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1484 if (!(perm & (1 << bit)))
1485 continue;
1486 if (first) {
1487 tomoyo_set_group(head, "file ");
1488 first = false;
1489 } else {
1490 tomoyo_set_slash(head);
1491 }
1492 tomoyo_set_string(head, tomoyo_mac_keywords
1493 [tomoyo_pnnn2mac[bit]]);
1494 }
1495 if (first)
1496 return true;
1497 tomoyo_print_name_union(head, &ptr->name);
1498 tomoyo_print_number_union(head, &ptr->mode);
1499 tomoyo_print_number_union(head, &ptr->major);
1500 tomoyo_print_number_union(head, &ptr->minor);
1501 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1502 struct tomoyo_inet_acl *ptr =
1503 container_of(acl, typeof(*ptr), head);
1504 const u8 perm = ptr->perm;
1505
1506 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1507 if (!(perm & (1 << bit)))
1508 continue;
1509 if (first) {
1510 tomoyo_set_group(head, "network inet ");
1511 tomoyo_set_string(head, tomoyo_proto_keyword
1512 [ptr->protocol]);
1513 tomoyo_set_space(head);
1514 first = false;
1515 } else {
1516 tomoyo_set_slash(head);
1517 }
1518 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1519 }
1520 if (first)
1521 return true;
1522 tomoyo_set_space(head);
1523 if (ptr->address.group) {
1524 tomoyo_set_string(head, "@");
1525 tomoyo_set_string(head, ptr->address.group->group_name
1526 ->name);
1527 } else {
1528 char buf[128];
1529
1530 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1531 tomoyo_io_printf(head, "%s", buf);
1532 }
1533 tomoyo_print_number_union(head, &ptr->port);
1534 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1535 struct tomoyo_unix_acl *ptr =
1536 container_of(acl, typeof(*ptr), head);
1537 const u8 perm = ptr->perm;
1538
1539 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1540 if (!(perm & (1 << bit)))
1541 continue;
1542 if (first) {
1543 tomoyo_set_group(head, "network unix ");
1544 tomoyo_set_string(head, tomoyo_proto_keyword
1545 [ptr->protocol]);
1546 tomoyo_set_space(head);
1547 first = false;
1548 } else {
1549 tomoyo_set_slash(head);
1550 }
1551 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1552 }
1553 if (first)
1554 return true;
1555 tomoyo_print_name_union(head, &ptr->name);
1556 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1557 struct tomoyo_mount_acl *ptr =
1558 container_of(acl, typeof(*ptr), head);
1559
1560 tomoyo_set_group(head, "file mount");
1561 tomoyo_print_name_union(head, &ptr->dev_name);
1562 tomoyo_print_name_union(head, &ptr->dir_name);
1563 tomoyo_print_name_union(head, &ptr->fs_type);
1564 tomoyo_print_number_union(head, &ptr->flags);
1565 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1566 struct tomoyo_env_acl *ptr =
1567 container_of(acl, typeof(*ptr), head);
1568
1569 tomoyo_set_group(head, "misc env ");
1570 tomoyo_set_string(head, ptr->env->name);
1571 }
1572 if (acl->cond) {
1573 head->r.print_cond_part = true;
1574 head->r.cond_step = 0;
1575 if (!tomoyo_flush(head))
1576 return false;
1577print_cond_part:
1578 if (!tomoyo_print_condition(head, acl->cond))
1579 return false;
1580 head->r.print_cond_part = false;
1581 } else {
1582 tomoyo_set_lf(head);
1583 }
1584 return true;
1585}
1586
1587/**
1588 * tomoyo_read_domain2 - Read domain policy.
1589 *
1590 * @head: Pointer to "struct tomoyo_io_buffer".
1591 * @list: Pointer to "struct list_head".
1592 *
1593 * Caller holds tomoyo_read_lock().
1594 *
1595 * Returns true on success, false otherwise.
1596 */
1597static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1598 struct list_head *list)
1599{
1600 list_for_each_cookie(head->r.acl, list) {
1601 struct tomoyo_acl_info *ptr =
1602 list_entry(head->r.acl, typeof(*ptr), list);
1603
1604 if (!tomoyo_print_entry(head, ptr))
1605 return false;
1606 }
1607 head->r.acl = NULL;
1608 return true;
1609}
1610
1611/**
1612 * tomoyo_read_domain - Read domain policy.
1613 *
1614 * @head: Pointer to "struct tomoyo_io_buffer".
1615 *
1616 * Caller holds tomoyo_read_lock().
1617 */
1618static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1619{
1620 if (head->r.eof)
1621 return;
1622 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1623 struct tomoyo_domain_info *domain =
1624 list_entry(head->r.domain, typeof(*domain), list);
1625 u8 i;
1626
1627 switch (head->r.step) {
1628 case 0:
1629 if (domain->is_deleted &&
1630 !head->r.print_this_domain_only)
1631 continue;
1632 /* Print domainname and flags. */
1633 tomoyo_set_string(head, domain->domainname->name);
1634 tomoyo_set_lf(head);
1635 tomoyo_io_printf(head, "use_profile %u\n",
1636 domain->profile);
1637 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1638 if (domain->flags[i])
1639 tomoyo_set_string(head, tomoyo_dif[i]);
1640 head->r.index = 0;
1641 head->r.step++;
1642 fallthrough;
1643 case 1:
1644 while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1645 i = head->r.index++;
1646 if (!test_bit(i, domain->group))
1647 continue;
1648 tomoyo_io_printf(head, "use_group %u\n", i);
1649 if (!tomoyo_flush(head))
1650 return;
1651 }
1652 head->r.index = 0;
1653 head->r.step++;
1654 tomoyo_set_lf(head);
1655 fallthrough;
1656 case 2:
1657 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1658 return;
1659 head->r.step++;
1660 if (!tomoyo_set_lf(head))
1661 return;
1662 fallthrough;
1663 case 3:
1664 head->r.step = 0;
1665 if (head->r.print_this_domain_only)
1666 goto done;
1667 }
1668 }
1669 done:
1670 head->r.eof = true;
1671}
1672
1673/**
1674 * tomoyo_write_pid: Specify PID to obtain domainname.
1675 *
1676 * @head: Pointer to "struct tomoyo_io_buffer".
1677 *
1678 * Returns 0.
1679 */
1680static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1681{
1682 head->r.eof = false;
1683 return 0;
1684}
1685
1686/**
1687 * tomoyo_read_pid - Get domainname of the specified PID.
1688 *
1689 * @head: Pointer to "struct tomoyo_io_buffer".
1690 *
1691 * Returns the domainname which the specified PID is in on success,
1692 * empty string otherwise.
1693 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1694 * using read()/write() interface rather than sysctl() interface.
1695 */
1696static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1697{
1698 char *buf = head->write_buf;
1699 bool global_pid = false;
1700 unsigned int pid;
1701 struct task_struct *p;
1702 struct tomoyo_domain_info *domain = NULL;
1703
1704 /* Accessing write_buf is safe because head->io_sem is held. */
1705 if (!buf) {
1706 head->r.eof = true;
1707 return; /* Do nothing if open(O_RDONLY). */
1708 }
1709 if (head->r.w_pos || head->r.eof)
1710 return;
1711 head->r.eof = true;
1712 if (tomoyo_str_starts(&buf, "global-pid "))
1713 global_pid = true;
1714 if (kstrtouint(buf, 10, &pid))
1715 return;
1716 rcu_read_lock();
1717 if (global_pid)
1718 p = find_task_by_pid_ns(pid, &init_pid_ns);
1719 else
1720 p = find_task_by_vpid(pid);
1721 if (p)
1722 domain = tomoyo_task(p)->domain_info;
1723 rcu_read_unlock();
1724 if (!domain)
1725 return;
1726 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1727 tomoyo_set_string(head, domain->domainname->name);
1728}
1729
1730/* String table for domain transition control keywords. */
1731static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1732 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1733 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1734 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1735 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1736 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1737 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1738};
1739
1740/* String table for grouping keywords. */
1741static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1742 [TOMOYO_PATH_GROUP] = "path_group ",
1743 [TOMOYO_NUMBER_GROUP] = "number_group ",
1744 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1745};
1746
1747/**
1748 * tomoyo_write_exception - Write exception policy.
1749 *
1750 * @head: Pointer to "struct tomoyo_io_buffer".
1751 *
1752 * Returns 0 on success, negative value otherwise.
1753 *
1754 * Caller holds tomoyo_read_lock().
1755 */
1756static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1757{
1758 const bool is_delete = head->w.is_delete;
1759 struct tomoyo_acl_param param = {
1760 .ns = head->w.ns,
1761 .is_delete = is_delete,
1762 .data = head->write_buf,
1763 };
1764 u8 i;
1765
1766 if (tomoyo_str_starts(¶m.data, "aggregator "))
1767 return tomoyo_write_aggregator(¶m);
1768 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1769 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i]))
1770 return tomoyo_write_transition_control(¶m, i);
1771 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1772 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i]))
1773 return tomoyo_write_group(¶m, i);
1774 if (tomoyo_str_starts(¶m.data, "acl_group ")) {
1775 unsigned int group;
1776 char *data;
1777
1778 group = simple_strtoul(param.data, &data, 10);
1779 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1780 return tomoyo_write_domain2
1781 (head->w.ns, &head->w.ns->acl_group[group],
1782 data, is_delete);
1783 }
1784 return -EINVAL;
1785}
1786
1787/**
1788 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1789 *
1790 * @head: Pointer to "struct tomoyo_io_buffer".
1791 * @idx: Index number.
1792 *
1793 * Returns true on success, false otherwise.
1794 *
1795 * Caller holds tomoyo_read_lock().
1796 */
1797static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1798{
1799 struct tomoyo_policy_namespace *ns =
1800 container_of(head->r.ns, typeof(*ns), namespace_list);
1801 struct list_head *list = &ns->group_list[idx];
1802
1803 list_for_each_cookie(head->r.group, list) {
1804 struct tomoyo_group *group =
1805 list_entry(head->r.group, typeof(*group), head.list);
1806
1807 list_for_each_cookie(head->r.acl, &group->member_list) {
1808 struct tomoyo_acl_head *ptr =
1809 list_entry(head->r.acl, typeof(*ptr), list);
1810
1811 if (ptr->is_deleted)
1812 continue;
1813 if (!tomoyo_flush(head))
1814 return false;
1815 tomoyo_print_namespace(head);
1816 tomoyo_set_string(head, tomoyo_group_name[idx]);
1817 tomoyo_set_string(head, group->group_name->name);
1818 if (idx == TOMOYO_PATH_GROUP) {
1819 tomoyo_set_space(head);
1820 tomoyo_set_string(head, container_of
1821 (ptr, struct tomoyo_path_group,
1822 head)->member_name->name);
1823 } else if (idx == TOMOYO_NUMBER_GROUP) {
1824 tomoyo_print_number_union(head, &container_of
1825 (ptr,
1826 struct tomoyo_number_group,
1827 head)->number);
1828 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1829 char buffer[128];
1830 struct tomoyo_address_group *member =
1831 container_of(ptr, typeof(*member),
1832 head);
1833
1834 tomoyo_print_ip(buffer, sizeof(buffer),
1835 &member->address);
1836 tomoyo_io_printf(head, " %s", buffer);
1837 }
1838 tomoyo_set_lf(head);
1839 }
1840 head->r.acl = NULL;
1841 }
1842 head->r.group = NULL;
1843 return true;
1844}
1845
1846/**
1847 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1848 *
1849 * @head: Pointer to "struct tomoyo_io_buffer".
1850 * @idx: Index number.
1851 *
1852 * Returns true on success, false otherwise.
1853 *
1854 * Caller holds tomoyo_read_lock().
1855 */
1856static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1857{
1858 struct tomoyo_policy_namespace *ns =
1859 container_of(head->r.ns, typeof(*ns), namespace_list);
1860 struct list_head *list = &ns->policy_list[idx];
1861
1862 list_for_each_cookie(head->r.acl, list) {
1863 struct tomoyo_acl_head *acl =
1864 container_of(head->r.acl, typeof(*acl), list);
1865 if (acl->is_deleted)
1866 continue;
1867 if (!tomoyo_flush(head))
1868 return false;
1869 switch (idx) {
1870 case TOMOYO_ID_TRANSITION_CONTROL:
1871 {
1872 struct tomoyo_transition_control *ptr =
1873 container_of(acl, typeof(*ptr), head);
1874
1875 tomoyo_print_namespace(head);
1876 tomoyo_set_string(head, tomoyo_transition_type
1877 [ptr->type]);
1878 tomoyo_set_string(head, ptr->program ?
1879 ptr->program->name : "any");
1880 tomoyo_set_string(head, " from ");
1881 tomoyo_set_string(head, ptr->domainname ?
1882 ptr->domainname->name :
1883 "any");
1884 }
1885 break;
1886 case TOMOYO_ID_AGGREGATOR:
1887 {
1888 struct tomoyo_aggregator *ptr =
1889 container_of(acl, typeof(*ptr), head);
1890
1891 tomoyo_print_namespace(head);
1892 tomoyo_set_string(head, "aggregator ");
1893 tomoyo_set_string(head,
1894 ptr->original_name->name);
1895 tomoyo_set_space(head);
1896 tomoyo_set_string(head,
1897 ptr->aggregated_name->name);
1898 }
1899 break;
1900 default:
1901 continue;
1902 }
1903 tomoyo_set_lf(head);
1904 }
1905 head->r.acl = NULL;
1906 return true;
1907}
1908
1909/**
1910 * tomoyo_read_exception - Read exception policy.
1911 *
1912 * @head: Pointer to "struct tomoyo_io_buffer".
1913 *
1914 * Caller holds tomoyo_read_lock().
1915 */
1916static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1917{
1918 struct tomoyo_policy_namespace *ns =
1919 container_of(head->r.ns, typeof(*ns), namespace_list);
1920
1921 if (head->r.eof)
1922 return;
1923 while (head->r.step < TOMOYO_MAX_POLICY &&
1924 tomoyo_read_policy(head, head->r.step))
1925 head->r.step++;
1926 if (head->r.step < TOMOYO_MAX_POLICY)
1927 return;
1928 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1929 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1930 head->r.step++;
1931 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1932 return;
1933 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1934 + TOMOYO_MAX_ACL_GROUPS) {
1935 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1936 - TOMOYO_MAX_GROUP;
1937 if (!tomoyo_read_domain2(head, &ns->acl_group
1938 [head->r.acl_group_index]))
1939 return;
1940 head->r.step++;
1941 }
1942 head->r.eof = true;
1943}
1944
1945/* Wait queue for kernel -> userspace notification. */
1946static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1947/* Wait queue for userspace -> kernel notification. */
1948static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1949
1950/* Structure for query. */
1951struct tomoyo_query {
1952 struct list_head list;
1953 struct tomoyo_domain_info *domain;
1954 char *query;
1955 size_t query_len;
1956 unsigned int serial;
1957 u8 timer;
1958 u8 answer;
1959 u8 retry;
1960};
1961
1962/* The list for "struct tomoyo_query". */
1963static LIST_HEAD(tomoyo_query_list);
1964
1965/* Lock for manipulating tomoyo_query_list. */
1966static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1967
1968/*
1969 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1970 * interface.
1971 */
1972static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1973
1974/**
1975 * tomoyo_truncate - Truncate a line.
1976 *
1977 * @str: String to truncate.
1978 *
1979 * Returns length of truncated @str.
1980 */
1981static int tomoyo_truncate(char *str)
1982{
1983 char *start = str;
1984
1985 while (*(unsigned char *) str > (unsigned char) ' ')
1986 str++;
1987 *str = '\0';
1988 return strlen(start) + 1;
1989}
1990
1991/**
1992 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1993 *
1994 * @domain: Pointer to "struct tomoyo_domain_info".
1995 * @header: Lines containing ACL.
1996 *
1997 * Returns nothing.
1998 */
1999static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
2000{
2001 char *buffer;
2002 char *realpath = NULL;
2003 char *argv0 = NULL;
2004 char *symlink = NULL;
2005 char *cp = strchr(header, '\n');
2006 int len;
2007
2008 if (!cp)
2009 return;
2010 cp = strchr(cp + 1, '\n');
2011 if (!cp)
2012 return;
2013 *cp++ = '\0';
2014 len = strlen(cp) + 1;
2015 /* strstr() will return NULL if ordering is wrong. */
2016 if (*cp == 'f') {
2017 argv0 = strstr(header, " argv[]={ \"");
2018 if (argv0) {
2019 argv0 += 10;
2020 len += tomoyo_truncate(argv0) + 14;
2021 }
2022 realpath = strstr(header, " exec={ realpath=\"");
2023 if (realpath) {
2024 realpath += 8;
2025 len += tomoyo_truncate(realpath) + 6;
2026 }
2027 symlink = strstr(header, " symlink.target=\"");
2028 if (symlink)
2029 len += tomoyo_truncate(symlink + 1) + 1;
2030 }
2031 buffer = kmalloc(len, GFP_NOFS);
2032 if (!buffer)
2033 return;
2034 snprintf(buffer, len - 1, "%s", cp);
2035 if (realpath)
2036 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2037 if (argv0)
2038 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2039 if (symlink)
2040 tomoyo_addprintf(buffer, len, "%s", symlink);
2041 tomoyo_normalize_line(buffer);
2042 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2043 false))
2044 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2045 kfree(buffer);
2046}
2047
2048/**
2049 * tomoyo_supervisor - Ask for the supervisor's decision.
2050 *
2051 * @r: Pointer to "struct tomoyo_request_info".
2052 * @fmt: The printf()'s format string, followed by parameters.
2053 *
2054 * Returns 0 if the supervisor decided to permit the access request which
2055 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2056 * supervisor decided to retry the access request which violated the policy in
2057 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2058 */
2059int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2060{
2061 va_list args;
2062 int error;
2063 int len;
2064 static unsigned int tomoyo_serial;
2065 struct tomoyo_query entry = { };
2066 bool quota_exceeded = false;
2067
2068 va_start(args, fmt);
2069 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2070 va_end(args);
2071 /* Write /sys/kernel/security/tomoyo/audit. */
2072 va_start(args, fmt);
2073 tomoyo_write_log2(r, len, fmt, args);
2074 va_end(args);
2075 /* Nothing more to do if granted. */
2076 if (r->granted)
2077 return 0;
2078 if (r->mode)
2079 tomoyo_update_stat(r->mode);
2080 switch (r->mode) {
2081 case TOMOYO_CONFIG_ENFORCING:
2082 error = -EPERM;
2083 if (atomic_read(&tomoyo_query_observers))
2084 break;
2085 goto out;
2086 case TOMOYO_CONFIG_LEARNING:
2087 error = 0;
2088 /* Check max_learning_entry parameter. */
2089 if (tomoyo_domain_quota_is_ok(r))
2090 break;
2091 fallthrough;
2092 default:
2093 return 0;
2094 }
2095 /* Get message. */
2096 va_start(args, fmt);
2097 entry.query = tomoyo_init_log(r, len, fmt, args);
2098 va_end(args);
2099 if (!entry.query)
2100 goto out;
2101 entry.query_len = strlen(entry.query) + 1;
2102 if (!error) {
2103 tomoyo_add_entry(r->domain, entry.query);
2104 goto out;
2105 }
2106 len = tomoyo_round2(entry.query_len);
2107 entry.domain = r->domain;
2108 spin_lock(&tomoyo_query_list_lock);
2109 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2110 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2111 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2112 quota_exceeded = true;
2113 } else {
2114 entry.serial = tomoyo_serial++;
2115 entry.retry = r->retry;
2116 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2117 list_add_tail(&entry.list, &tomoyo_query_list);
2118 }
2119 spin_unlock(&tomoyo_query_list_lock);
2120 if (quota_exceeded)
2121 goto out;
2122 /* Give 10 seconds for supervisor's opinion. */
2123 while (entry.timer < 10) {
2124 wake_up_all(&tomoyo_query_wait);
2125 if (wait_event_interruptible_timeout
2126 (tomoyo_answer_wait, entry.answer ||
2127 !atomic_read(&tomoyo_query_observers), HZ))
2128 break;
2129 entry.timer++;
2130 }
2131 spin_lock(&tomoyo_query_list_lock);
2132 list_del(&entry.list);
2133 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2134 spin_unlock(&tomoyo_query_list_lock);
2135 switch (entry.answer) {
2136 case 3: /* Asked to retry by administrator. */
2137 error = TOMOYO_RETRY_REQUEST;
2138 r->retry++;
2139 break;
2140 case 1:
2141 /* Granted by administrator. */
2142 error = 0;
2143 break;
2144 default:
2145 /* Timed out or rejected by administrator. */
2146 break;
2147 }
2148out:
2149 kfree(entry.query);
2150 return error;
2151}
2152
2153/**
2154 * tomoyo_find_domain_by_qid - Get domain by query id.
2155 *
2156 * @serial: Query ID assigned by tomoyo_supervisor().
2157 *
2158 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2159 */
2160static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2161(unsigned int serial)
2162{
2163 struct tomoyo_query *ptr;
2164 struct tomoyo_domain_info *domain = NULL;
2165
2166 spin_lock(&tomoyo_query_list_lock);
2167 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2168 if (ptr->serial != serial)
2169 continue;
2170 domain = ptr->domain;
2171 break;
2172 }
2173 spin_unlock(&tomoyo_query_list_lock);
2174 return domain;
2175}
2176
2177/**
2178 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2179 *
2180 * @file: Pointer to "struct file".
2181 * @wait: Pointer to "poll_table".
2182 *
2183 * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2184 *
2185 * Waits for access requests which violated policy in enforcing mode.
2186 */
2187static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2188{
2189 if (!list_empty(&tomoyo_query_list))
2190 return EPOLLIN | EPOLLRDNORM;
2191 poll_wait(file, &tomoyo_query_wait, wait);
2192 if (!list_empty(&tomoyo_query_list))
2193 return EPOLLIN | EPOLLRDNORM;
2194 return 0;
2195}
2196
2197/**
2198 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2199 *
2200 * @head: Pointer to "struct tomoyo_io_buffer".
2201 */
2202static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2203{
2204 struct list_head *tmp;
2205 unsigned int pos = 0;
2206 size_t len = 0;
2207 char *buf;
2208
2209 if (head->r.w_pos)
2210 return;
2211 kfree(head->read_buf);
2212 head->read_buf = NULL;
2213 spin_lock(&tomoyo_query_list_lock);
2214 list_for_each(tmp, &tomoyo_query_list) {
2215 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2216
2217 if (pos++ != head->r.query_index)
2218 continue;
2219 len = ptr->query_len;
2220 break;
2221 }
2222 spin_unlock(&tomoyo_query_list_lock);
2223 if (!len) {
2224 head->r.query_index = 0;
2225 return;
2226 }
2227 buf = kzalloc(len + 32, GFP_NOFS);
2228 if (!buf)
2229 return;
2230 pos = 0;
2231 spin_lock(&tomoyo_query_list_lock);
2232 list_for_each(tmp, &tomoyo_query_list) {
2233 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2234
2235 if (pos++ != head->r.query_index)
2236 continue;
2237 /*
2238 * Some query can be skipped because tomoyo_query_list
2239 * can change, but I don't care.
2240 */
2241 if (len == ptr->query_len)
2242 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2243 ptr->retry, ptr->query);
2244 break;
2245 }
2246 spin_unlock(&tomoyo_query_list_lock);
2247 if (buf[0]) {
2248 head->read_buf = buf;
2249 head->r.w[head->r.w_pos++] = buf;
2250 head->r.query_index++;
2251 } else {
2252 kfree(buf);
2253 }
2254}
2255
2256/**
2257 * tomoyo_write_answer - Write the supervisor's decision.
2258 *
2259 * @head: Pointer to "struct tomoyo_io_buffer".
2260 *
2261 * Returns 0 on success, -EINVAL otherwise.
2262 */
2263static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2264{
2265 char *data = head->write_buf;
2266 struct list_head *tmp;
2267 unsigned int serial;
2268 unsigned int answer;
2269
2270 spin_lock(&tomoyo_query_list_lock);
2271 list_for_each(tmp, &tomoyo_query_list) {
2272 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2273
2274 ptr->timer = 0;
2275 }
2276 spin_unlock(&tomoyo_query_list_lock);
2277 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2278 return -EINVAL;
2279 spin_lock(&tomoyo_query_list_lock);
2280 list_for_each(tmp, &tomoyo_query_list) {
2281 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2282
2283 if (ptr->serial != serial)
2284 continue;
2285 ptr->answer = answer;
2286 /* Remove from tomoyo_query_list. */
2287 if (ptr->answer)
2288 list_del_init(&ptr->list);
2289 break;
2290 }
2291 spin_unlock(&tomoyo_query_list_lock);
2292 return 0;
2293}
2294
2295/**
2296 * tomoyo_read_version: Get version.
2297 *
2298 * @head: Pointer to "struct tomoyo_io_buffer".
2299 *
2300 * Returns version information.
2301 */
2302static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2303{
2304 if (!head->r.eof) {
2305 tomoyo_io_printf(head, "2.6.0");
2306 head->r.eof = true;
2307 }
2308}
2309
2310/* String table for /sys/kernel/security/tomoyo/stat interface. */
2311static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2312 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2313 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2314 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2315 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2316};
2317
2318/* String table for /sys/kernel/security/tomoyo/stat interface. */
2319static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2320 [TOMOYO_MEMORY_POLICY] = "policy:",
2321 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2322 [TOMOYO_MEMORY_QUERY] = "query message:",
2323};
2324
2325/* Counter for number of updates. */
2326static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2327/* Timestamp counter for last updated. */
2328static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2329
2330/**
2331 * tomoyo_update_stat - Update statistic counters.
2332 *
2333 * @index: Index for policy type.
2334 *
2335 * Returns nothing.
2336 */
2337void tomoyo_update_stat(const u8 index)
2338{
2339 atomic_inc(&tomoyo_stat_updated[index]);
2340 tomoyo_stat_modified[index] = ktime_get_real_seconds();
2341}
2342
2343/**
2344 * tomoyo_read_stat - Read statistic data.
2345 *
2346 * @head: Pointer to "struct tomoyo_io_buffer".
2347 *
2348 * Returns nothing.
2349 */
2350static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2351{
2352 u8 i;
2353 unsigned int total = 0;
2354
2355 if (head->r.eof)
2356 return;
2357 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2358 tomoyo_io_printf(head, "Policy %-30s %10u",
2359 tomoyo_policy_headers[i],
2360 atomic_read(&tomoyo_stat_updated[i]));
2361 if (tomoyo_stat_modified[i]) {
2362 struct tomoyo_time stamp;
2363
2364 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2365 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2366 stamp.year, stamp.month, stamp.day,
2367 stamp.hour, stamp.min, stamp.sec);
2368 }
2369 tomoyo_set_lf(head);
2370 }
2371 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2372 unsigned int used = tomoyo_memory_used[i];
2373
2374 total += used;
2375 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2376 tomoyo_memory_headers[i], used);
2377 used = tomoyo_memory_quota[i];
2378 if (used)
2379 tomoyo_io_printf(head, " (Quota: %10u)", used);
2380 tomoyo_set_lf(head);
2381 }
2382 tomoyo_io_printf(head, "Total memory used: %10u\n",
2383 total);
2384 head->r.eof = true;
2385}
2386
2387/**
2388 * tomoyo_write_stat - Set memory quota.
2389 *
2390 * @head: Pointer to "struct tomoyo_io_buffer".
2391 *
2392 * Returns 0.
2393 */
2394static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2395{
2396 char *data = head->write_buf;
2397 u8 i;
2398
2399 if (tomoyo_str_starts(&data, "Memory used by "))
2400 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2401 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2402 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2403 return 0;
2404}
2405
2406/**
2407 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2408 *
2409 * @type: Type of interface.
2410 * @file: Pointer to "struct file".
2411 *
2412 * Returns 0 on success, negative value otherwise.
2413 */
2414int tomoyo_open_control(const u8 type, struct file *file)
2415{
2416 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2417
2418 if (!head)
2419 return -ENOMEM;
2420 mutex_init(&head->io_sem);
2421 head->type = type;
2422 switch (type) {
2423 case TOMOYO_DOMAINPOLICY:
2424 /* /sys/kernel/security/tomoyo/domain_policy */
2425 head->write = tomoyo_write_domain;
2426 head->read = tomoyo_read_domain;
2427 break;
2428 case TOMOYO_EXCEPTIONPOLICY:
2429 /* /sys/kernel/security/tomoyo/exception_policy */
2430 head->write = tomoyo_write_exception;
2431 head->read = tomoyo_read_exception;
2432 break;
2433 case TOMOYO_AUDIT:
2434 /* /sys/kernel/security/tomoyo/audit */
2435 head->poll = tomoyo_poll_log;
2436 head->read = tomoyo_read_log;
2437 break;
2438 case TOMOYO_PROCESS_STATUS:
2439 /* /sys/kernel/security/tomoyo/.process_status */
2440 head->write = tomoyo_write_pid;
2441 head->read = tomoyo_read_pid;
2442 break;
2443 case TOMOYO_VERSION:
2444 /* /sys/kernel/security/tomoyo/version */
2445 head->read = tomoyo_read_version;
2446 head->readbuf_size = 128;
2447 break;
2448 case TOMOYO_STAT:
2449 /* /sys/kernel/security/tomoyo/stat */
2450 head->write = tomoyo_write_stat;
2451 head->read = tomoyo_read_stat;
2452 head->readbuf_size = 1024;
2453 break;
2454 case TOMOYO_PROFILE:
2455 /* /sys/kernel/security/tomoyo/profile */
2456 head->write = tomoyo_write_profile;
2457 head->read = tomoyo_read_profile;
2458 break;
2459 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2460 head->poll = tomoyo_poll_query;
2461 head->write = tomoyo_write_answer;
2462 head->read = tomoyo_read_query;
2463 break;
2464 case TOMOYO_MANAGER:
2465 /* /sys/kernel/security/tomoyo/manager */
2466 head->write = tomoyo_write_manager;
2467 head->read = tomoyo_read_manager;
2468 break;
2469 }
2470 if (!(file->f_mode & FMODE_READ)) {
2471 /*
2472 * No need to allocate read_buf since it is not opened
2473 * for reading.
2474 */
2475 head->read = NULL;
2476 head->poll = NULL;
2477 } else if (!head->poll) {
2478 /* Don't allocate read_buf for poll() access. */
2479 if (!head->readbuf_size)
2480 head->readbuf_size = 4096 * 2;
2481 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2482 if (!head->read_buf) {
2483 kfree(head);
2484 return -ENOMEM;
2485 }
2486 }
2487 if (!(file->f_mode & FMODE_WRITE)) {
2488 /*
2489 * No need to allocate write_buf since it is not opened
2490 * for writing.
2491 */
2492 head->write = NULL;
2493 } else if (head->write) {
2494 head->writebuf_size = 4096 * 2;
2495 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2496 if (!head->write_buf) {
2497 kfree(head->read_buf);
2498 kfree(head);
2499 return -ENOMEM;
2500 }
2501 }
2502 /*
2503 * If the file is /sys/kernel/security/tomoyo/query , increment the
2504 * observer counter.
2505 * The obserber counter is used by tomoyo_supervisor() to see if
2506 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2507 */
2508 if (type == TOMOYO_QUERY)
2509 atomic_inc(&tomoyo_query_observers);
2510 file->private_data = head;
2511 tomoyo_notify_gc(head, true);
2512 return 0;
2513}
2514
2515/**
2516 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2517 *
2518 * @file: Pointer to "struct file".
2519 * @wait: Pointer to "poll_table". Maybe NULL.
2520 *
2521 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2522 * EPOLLOUT | EPOLLWRNORM otherwise.
2523 */
2524__poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2525{
2526 struct tomoyo_io_buffer *head = file->private_data;
2527
2528 if (head->poll)
2529 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2530 return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2531}
2532
2533/**
2534 * tomoyo_set_namespace_cursor - Set namespace to read.
2535 *
2536 * @head: Pointer to "struct tomoyo_io_buffer".
2537 *
2538 * Returns nothing.
2539 */
2540static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2541{
2542 struct list_head *ns;
2543
2544 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2545 head->type != TOMOYO_PROFILE)
2546 return;
2547 /*
2548 * If this is the first read, or reading previous namespace finished
2549 * and has more namespaces to read, update the namespace cursor.
2550 */
2551 ns = head->r.ns;
2552 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2553 /* Clearing is OK because tomoyo_flush() returned true. */
2554 memset(&head->r, 0, sizeof(head->r));
2555 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2556 }
2557}
2558
2559/**
2560 * tomoyo_has_more_namespace - Check for unread namespaces.
2561 *
2562 * @head: Pointer to "struct tomoyo_io_buffer".
2563 *
2564 * Returns true if we have more entries to print, false otherwise.
2565 */
2566static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2567{
2568 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2569 head->type == TOMOYO_PROFILE) && head->r.eof &&
2570 head->r.ns->next != &tomoyo_namespace_list;
2571}
2572
2573/**
2574 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2575 *
2576 * @head: Pointer to "struct tomoyo_io_buffer".
2577 * @buffer: Poiner to buffer to write to.
2578 * @buffer_len: Size of @buffer.
2579 *
2580 * Returns bytes read on success, negative value otherwise.
2581 */
2582ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2583 const int buffer_len)
2584{
2585 int len;
2586 int idx;
2587
2588 if (!head->read)
2589 return -EINVAL;
2590 if (mutex_lock_interruptible(&head->io_sem))
2591 return -EINTR;
2592 head->read_user_buf = buffer;
2593 head->read_user_buf_avail = buffer_len;
2594 idx = tomoyo_read_lock();
2595 if (tomoyo_flush(head))
2596 /* Call the policy handler. */
2597 do {
2598 tomoyo_set_namespace_cursor(head);
2599 head->read(head);
2600 } while (tomoyo_flush(head) &&
2601 tomoyo_has_more_namespace(head));
2602 tomoyo_read_unlock(idx);
2603 len = head->read_user_buf - buffer;
2604 mutex_unlock(&head->io_sem);
2605 return len;
2606}
2607
2608/**
2609 * tomoyo_parse_policy - Parse a policy line.
2610 *
2611 * @head: Poiter to "struct tomoyo_io_buffer".
2612 * @line: Line to parse.
2613 *
2614 * Returns 0 on success, negative value otherwise.
2615 *
2616 * Caller holds tomoyo_read_lock().
2617 */
2618static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2619{
2620 /* Delete request? */
2621 head->w.is_delete = !strncmp(line, "delete ", 7);
2622 if (head->w.is_delete)
2623 memmove(line, line + 7, strlen(line + 7) + 1);
2624 /* Selecting namespace to update. */
2625 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2626 head->type == TOMOYO_PROFILE) {
2627 if (*line == '<') {
2628 char *cp = strchr(line, ' ');
2629
2630 if (cp) {
2631 *cp++ = '\0';
2632 head->w.ns = tomoyo_assign_namespace(line);
2633 memmove(line, cp, strlen(cp) + 1);
2634 } else
2635 head->w.ns = NULL;
2636 } else
2637 head->w.ns = &tomoyo_kernel_namespace;
2638 /* Don't allow updating if namespace is invalid. */
2639 if (!head->w.ns)
2640 return -ENOENT;
2641 }
2642 /* Do the update. */
2643 return head->write(head);
2644}
2645
2646/**
2647 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2648 *
2649 * @head: Pointer to "struct tomoyo_io_buffer".
2650 * @buffer: Pointer to buffer to read from.
2651 * @buffer_len: Size of @buffer.
2652 *
2653 * Returns @buffer_len on success, negative value otherwise.
2654 */
2655ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2656 const char __user *buffer, const int buffer_len)
2657{
2658 int error = buffer_len;
2659 size_t avail_len = buffer_len;
2660 char *cp0 = head->write_buf;
2661 int idx;
2662
2663 if (!head->write)
2664 return -EINVAL;
2665 if (mutex_lock_interruptible(&head->io_sem))
2666 return -EINTR;
2667 head->read_user_buf_avail = 0;
2668 idx = tomoyo_read_lock();
2669 /* Read a line and dispatch it to the policy handler. */
2670 while (avail_len > 0) {
2671 char c;
2672
2673 if (head->w.avail >= head->writebuf_size - 1) {
2674 const int len = head->writebuf_size * 2;
2675 char *cp = kzalloc(len, GFP_NOFS);
2676
2677 if (!cp) {
2678 error = -ENOMEM;
2679 break;
2680 }
2681 memmove(cp, cp0, head->w.avail);
2682 kfree(cp0);
2683 head->write_buf = cp;
2684 cp0 = cp;
2685 head->writebuf_size = len;
2686 }
2687 if (get_user(c, buffer)) {
2688 error = -EFAULT;
2689 break;
2690 }
2691 buffer++;
2692 avail_len--;
2693 cp0[head->w.avail++] = c;
2694 if (c != '\n')
2695 continue;
2696 cp0[head->w.avail - 1] = '\0';
2697 head->w.avail = 0;
2698 tomoyo_normalize_line(cp0);
2699 if (!strcmp(cp0, "reset")) {
2700 head->w.ns = &tomoyo_kernel_namespace;
2701 head->w.domain = NULL;
2702 memset(&head->r, 0, sizeof(head->r));
2703 continue;
2704 }
2705 /* Don't allow updating policies by non manager programs. */
2706 switch (head->type) {
2707 case TOMOYO_PROCESS_STATUS:
2708 /* This does not write anything. */
2709 break;
2710 case TOMOYO_DOMAINPOLICY:
2711 if (tomoyo_select_domain(head, cp0))
2712 continue;
2713 fallthrough;
2714 case TOMOYO_EXCEPTIONPOLICY:
2715 if (!strcmp(cp0, "select transition_only")) {
2716 head->r.print_transition_related_only = true;
2717 continue;
2718 }
2719 fallthrough;
2720 default:
2721 if (!tomoyo_manager()) {
2722 error = -EPERM;
2723 goto out;
2724 }
2725 }
2726 switch (tomoyo_parse_policy(head, cp0)) {
2727 case -EPERM:
2728 error = -EPERM;
2729 goto out;
2730 case 0:
2731 switch (head->type) {
2732 case TOMOYO_DOMAINPOLICY:
2733 case TOMOYO_EXCEPTIONPOLICY:
2734 case TOMOYO_STAT:
2735 case TOMOYO_PROFILE:
2736 case TOMOYO_MANAGER:
2737 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2738 break;
2739 default:
2740 break;
2741 }
2742 break;
2743 }
2744 }
2745out:
2746 tomoyo_read_unlock(idx);
2747 mutex_unlock(&head->io_sem);
2748 return error;
2749}
2750
2751/**
2752 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2753 *
2754 * @head: Pointer to "struct tomoyo_io_buffer".
2755 */
2756void tomoyo_close_control(struct tomoyo_io_buffer *head)
2757{
2758 /*
2759 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2760 * observer counter.
2761 */
2762 if (head->type == TOMOYO_QUERY &&
2763 atomic_dec_and_test(&tomoyo_query_observers))
2764 wake_up_all(&tomoyo_answer_wait);
2765 tomoyo_notify_gc(head, false);
2766}
2767
2768/**
2769 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2770 */
2771void tomoyo_check_profile(void)
2772{
2773 struct tomoyo_domain_info *domain;
2774 const int idx = tomoyo_read_lock();
2775
2776 tomoyo_policy_loaded = true;
2777 pr_info("TOMOYO: 2.6.0\n");
2778 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2779 srcu_read_lock_held(&tomoyo_ss)) {
2780 const u8 profile = domain->profile;
2781 struct tomoyo_policy_namespace *ns = domain->ns;
2782
2783 if (ns->profile_version == 20110903) {
2784 pr_info_once("Converting profile version from %u to %u.\n",
2785 20110903, 20150505);
2786 ns->profile_version = 20150505;
2787 }
2788 if (ns->profile_version != 20150505)
2789 pr_err("Profile version %u is not supported.\n",
2790 ns->profile_version);
2791 else if (!ns->profile_ptr[profile])
2792 pr_err("Profile %u (used by '%s') is not defined.\n",
2793 profile, domain->domainname->name);
2794 else
2795 continue;
2796 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2797 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2798 panic("STOP!");
2799 }
2800 tomoyo_read_unlock(idx);
2801 pr_info("Mandatory Access Control activated.\n");
2802}
2803
2804/**
2805 * tomoyo_load_builtin_policy - Load built-in policy.
2806 *
2807 * Returns nothing.
2808 */
2809void __init tomoyo_load_builtin_policy(void)
2810{
2811#ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2812 static char tomoyo_builtin_profile[] __initdata =
2813 "PROFILE_VERSION=20150505\n"
2814 "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2815 static char tomoyo_builtin_exception_policy[] __initdata =
2816 "aggregator proc:/self/exe /proc/self/exe\n";
2817 static char tomoyo_builtin_domain_policy[] __initdata = "";
2818 static char tomoyo_builtin_manager[] __initdata = "";
2819 static char tomoyo_builtin_stat[] __initdata = "";
2820#else
2821 /*
2822 * This include file is manually created and contains built-in policy
2823 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2824 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2825 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2826 */
2827#include "builtin-policy.h"
2828#endif
2829 u8 i;
2830 const int idx = tomoyo_read_lock();
2831
2832 for (i = 0; i < 5; i++) {
2833 struct tomoyo_io_buffer head = { };
2834 char *start = "";
2835
2836 switch (i) {
2837 case 0:
2838 start = tomoyo_builtin_profile;
2839 head.type = TOMOYO_PROFILE;
2840 head.write = tomoyo_write_profile;
2841 break;
2842 case 1:
2843 start = tomoyo_builtin_exception_policy;
2844 head.type = TOMOYO_EXCEPTIONPOLICY;
2845 head.write = tomoyo_write_exception;
2846 break;
2847 case 2:
2848 start = tomoyo_builtin_domain_policy;
2849 head.type = TOMOYO_DOMAINPOLICY;
2850 head.write = tomoyo_write_domain;
2851 break;
2852 case 3:
2853 start = tomoyo_builtin_manager;
2854 head.type = TOMOYO_MANAGER;
2855 head.write = tomoyo_write_manager;
2856 break;
2857 case 4:
2858 start = tomoyo_builtin_stat;
2859 head.type = TOMOYO_STAT;
2860 head.write = tomoyo_write_stat;
2861 break;
2862 }
2863 while (1) {
2864 char *end = strchr(start, '\n');
2865
2866 if (!end)
2867 break;
2868 *end = '\0';
2869 tomoyo_normalize_line(start);
2870 head.write_buf = start;
2871 tomoyo_parse_policy(&head, start);
2872 start = end + 1;
2873 }
2874 }
2875 tomoyo_read_unlock(idx);
2876#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2877 tomoyo_check_profile();
2878#endif
2879}