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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 <linux/string_helpers.h>
12#include "common.h"
13
14/* String table for operation mode. */
15const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
16 [TOMOYO_CONFIG_DISABLED] = "disabled",
17 [TOMOYO_CONFIG_LEARNING] = "learning",
18 [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
19 [TOMOYO_CONFIG_ENFORCING] = "enforcing"
20};
21
22/* String table for /sys/kernel/security/tomoyo/profile */
23const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
24 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
25 /* CONFIG::file group */
26 [TOMOYO_MAC_FILE_EXECUTE] = "execute",
27 [TOMOYO_MAC_FILE_OPEN] = "open",
28 [TOMOYO_MAC_FILE_CREATE] = "create",
29 [TOMOYO_MAC_FILE_UNLINK] = "unlink",
30 [TOMOYO_MAC_FILE_GETATTR] = "getattr",
31 [TOMOYO_MAC_FILE_MKDIR] = "mkdir",
32 [TOMOYO_MAC_FILE_RMDIR] = "rmdir",
33 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo",
34 [TOMOYO_MAC_FILE_MKSOCK] = "mksock",
35 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate",
36 [TOMOYO_MAC_FILE_SYMLINK] = "symlink",
37 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock",
38 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar",
39 [TOMOYO_MAC_FILE_LINK] = "link",
40 [TOMOYO_MAC_FILE_RENAME] = "rename",
41 [TOMOYO_MAC_FILE_CHMOD] = "chmod",
42 [TOMOYO_MAC_FILE_CHOWN] = "chown",
43 [TOMOYO_MAC_FILE_CHGRP] = "chgrp",
44 [TOMOYO_MAC_FILE_IOCTL] = "ioctl",
45 [TOMOYO_MAC_FILE_CHROOT] = "chroot",
46 [TOMOYO_MAC_FILE_MOUNT] = "mount",
47 [TOMOYO_MAC_FILE_UMOUNT] = "unmount",
48 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
49 /* CONFIG::network group */
50 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind",
51 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen",
52 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect",
53 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind",
54 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send",
55 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind",
56 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send",
57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind",
58 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen",
59 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect",
60 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind",
61 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send",
62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind",
63 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen",
64 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
65 /* CONFIG::misc group */
66 [TOMOYO_MAC_ENVIRON] = "env",
67 /* CONFIG group */
68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
69 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
70 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
71};
72
73/* String table for conditions. */
74const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
75 [TOMOYO_TASK_UID] = "task.uid",
76 [TOMOYO_TASK_EUID] = "task.euid",
77 [TOMOYO_TASK_SUID] = "task.suid",
78 [TOMOYO_TASK_FSUID] = "task.fsuid",
79 [TOMOYO_TASK_GID] = "task.gid",
80 [TOMOYO_TASK_EGID] = "task.egid",
81 [TOMOYO_TASK_SGID] = "task.sgid",
82 [TOMOYO_TASK_FSGID] = "task.fsgid",
83 [TOMOYO_TASK_PID] = "task.pid",
84 [TOMOYO_TASK_PPID] = "task.ppid",
85 [TOMOYO_EXEC_ARGC] = "exec.argc",
86 [TOMOYO_EXEC_ENVC] = "exec.envc",
87 [TOMOYO_TYPE_IS_SOCKET] = "socket",
88 [TOMOYO_TYPE_IS_SYMLINK] = "symlink",
89 [TOMOYO_TYPE_IS_FILE] = "file",
90 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
91 [TOMOYO_TYPE_IS_DIRECTORY] = "directory",
92 [TOMOYO_TYPE_IS_CHAR_DEV] = "char",
93 [TOMOYO_TYPE_IS_FIFO] = "fifo",
94 [TOMOYO_MODE_SETUID] = "setuid",
95 [TOMOYO_MODE_SETGID] = "setgid",
96 [TOMOYO_MODE_STICKY] = "sticky",
97 [TOMOYO_MODE_OWNER_READ] = "owner_read",
98 [TOMOYO_MODE_OWNER_WRITE] = "owner_write",
99 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
100 [TOMOYO_MODE_GROUP_READ] = "group_read",
101 [TOMOYO_MODE_GROUP_WRITE] = "group_write",
102 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
103 [TOMOYO_MODE_OTHERS_READ] = "others_read",
104 [TOMOYO_MODE_OTHERS_WRITE] = "others_write",
105 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
106 [TOMOYO_EXEC_REALPATH] = "exec.realpath",
107 [TOMOYO_SYMLINK_TARGET] = "symlink.target",
108 [TOMOYO_PATH1_UID] = "path1.uid",
109 [TOMOYO_PATH1_GID] = "path1.gid",
110 [TOMOYO_PATH1_INO] = "path1.ino",
111 [TOMOYO_PATH1_MAJOR] = "path1.major",
112 [TOMOYO_PATH1_MINOR] = "path1.minor",
113 [TOMOYO_PATH1_PERM] = "path1.perm",
114 [TOMOYO_PATH1_TYPE] = "path1.type",
115 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
116 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
117 [TOMOYO_PATH2_UID] = "path2.uid",
118 [TOMOYO_PATH2_GID] = "path2.gid",
119 [TOMOYO_PATH2_INO] = "path2.ino",
120 [TOMOYO_PATH2_MAJOR] = "path2.major",
121 [TOMOYO_PATH2_MINOR] = "path2.minor",
122 [TOMOYO_PATH2_PERM] = "path2.perm",
123 [TOMOYO_PATH2_TYPE] = "path2.type",
124 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
125 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
126 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
127 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
128 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
129 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
130 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
131 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
132 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
133 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
134};
135
136/* String table for PREFERENCE keyword. */
137static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
138 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
139 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
140};
141
142/* String table for path operation. */
143const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
144 [TOMOYO_TYPE_EXECUTE] = "execute",
145 [TOMOYO_TYPE_READ] = "read",
146 [TOMOYO_TYPE_WRITE] = "write",
147 [TOMOYO_TYPE_APPEND] = "append",
148 [TOMOYO_TYPE_UNLINK] = "unlink",
149 [TOMOYO_TYPE_GETATTR] = "getattr",
150 [TOMOYO_TYPE_RMDIR] = "rmdir",
151 [TOMOYO_TYPE_TRUNCATE] = "truncate",
152 [TOMOYO_TYPE_SYMLINK] = "symlink",
153 [TOMOYO_TYPE_CHROOT] = "chroot",
154 [TOMOYO_TYPE_UMOUNT] = "unmount",
155};
156
157/* String table for socket's operation. */
158const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
159 [TOMOYO_NETWORK_BIND] = "bind",
160 [TOMOYO_NETWORK_LISTEN] = "listen",
161 [TOMOYO_NETWORK_CONNECT] = "connect",
162 [TOMOYO_NETWORK_SEND] = "send",
163};
164
165/* String table for categories. */
166static const char * const tomoyo_category_keywords
167[TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
168 [TOMOYO_MAC_CATEGORY_FILE] = "file",
169 [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
170 [TOMOYO_MAC_CATEGORY_MISC] = "misc",
171};
172
173/* Permit policy management by non-root user? */
174static bool tomoyo_manage_by_non_root;
175
176/* Utility functions. */
177
178/**
179 * tomoyo_addprintf - strncat()-like-snprintf().
180 *
181 * @buffer: Buffer to write to. Must be '\0'-terminated.
182 * @len: Size of @buffer.
183 * @fmt: The printf()'s format string, followed by parameters.
184 *
185 * Returns nothing.
186 */
187static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
188{
189 va_list args;
190 const int pos = strlen(buffer);
191
192 va_start(args, fmt);
193 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
194 va_end(args);
195}
196
197/**
198 * tomoyo_flush - Flush queued string to userspace's buffer.
199 *
200 * @head: Pointer to "struct tomoyo_io_buffer".
201 *
202 * Returns true if all data was flushed, false otherwise.
203 */
204static bool tomoyo_flush(struct tomoyo_io_buffer *head)
205{
206 while (head->r.w_pos) {
207 const char *w = head->r.w[0];
208 size_t len = strlen(w);
209
210 if (len) {
211 if (len > head->read_user_buf_avail)
212 len = head->read_user_buf_avail;
213 if (!len)
214 return false;
215 if (copy_to_user(head->read_user_buf, w, len))
216 return false;
217 head->read_user_buf_avail -= len;
218 head->read_user_buf += len;
219 w += len;
220 }
221 head->r.w[0] = w;
222 if (*w)
223 return false;
224 /* Add '\0' for audit logs and query. */
225 if (head->poll) {
226 if (!head->read_user_buf_avail ||
227 copy_to_user(head->read_user_buf, "", 1))
228 return false;
229 head->read_user_buf_avail--;
230 head->read_user_buf++;
231 }
232 head->r.w_pos--;
233 for (len = 0; len < head->r.w_pos; len++)
234 head->r.w[len] = head->r.w[len + 1];
235 }
236 head->r.avail = 0;
237 return true;
238}
239
240/**
241 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
242 *
243 * @head: Pointer to "struct tomoyo_io_buffer".
244 * @string: String to print.
245 *
246 * Note that @string has to be kept valid until @head is kfree()d.
247 * This means that char[] allocated on stack memory cannot be passed to
248 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
249 */
250static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
251{
252 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
253 head->r.w[head->r.w_pos++] = string;
254 tomoyo_flush(head);
255 } else
256 WARN_ON(1);
257}
258
259static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
260 ...) __printf(2, 3);
261
262/**
263 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
264 *
265 * @head: Pointer to "struct tomoyo_io_buffer".
266 * @fmt: The printf()'s format string, followed by parameters.
267 */
268static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
269 ...)
270{
271 va_list args;
272 size_t len;
273 size_t pos = head->r.avail;
274 int size = head->readbuf_size - pos;
275
276 if (size <= 0)
277 return;
278 va_start(args, fmt);
279 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
280 va_end(args);
281 if (pos + len >= head->readbuf_size) {
282 WARN_ON(1);
283 return;
284 }
285 head->r.avail += len;
286 tomoyo_set_string(head, head->read_buf + pos);
287}
288
289/**
290 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
291 *
292 * @head: Pointer to "struct tomoyo_io_buffer".
293 *
294 * Returns nothing.
295 */
296static void tomoyo_set_space(struct tomoyo_io_buffer *head)
297{
298 tomoyo_set_string(head, " ");
299}
300
301/**
302 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
303 *
304 * @head: Pointer to "struct tomoyo_io_buffer".
305 *
306 * Returns nothing.
307 */
308static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
309{
310 tomoyo_set_string(head, "\n");
311 return !head->r.w_pos;
312}
313
314/**
315 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
316 *
317 * @head: Pointer to "struct tomoyo_io_buffer".
318 *
319 * Returns nothing.
320 */
321static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
322{
323 tomoyo_set_string(head, "/");
324}
325
326/* List of namespaces. */
327LIST_HEAD(tomoyo_namespace_list);
328/* True if namespace other than tomoyo_kernel_namespace is defined. */
329static bool tomoyo_namespace_enabled;
330
331/**
332 * tomoyo_init_policy_namespace - Initialize namespace.
333 *
334 * @ns: Pointer to "struct tomoyo_policy_namespace".
335 *
336 * Returns nothing.
337 */
338void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
339{
340 unsigned int idx;
341
342 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
343 INIT_LIST_HEAD(&ns->acl_group[idx]);
344 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
345 INIT_LIST_HEAD(&ns->group_list[idx]);
346 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
347 INIT_LIST_HEAD(&ns->policy_list[idx]);
348 ns->profile_version = 20150505;
349 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
350 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
351}
352
353/**
354 * tomoyo_print_namespace - Print namespace header.
355 *
356 * @head: Pointer to "struct tomoyo_io_buffer".
357 *
358 * Returns nothing.
359 */
360static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
361{
362 if (!tomoyo_namespace_enabled)
363 return;
364 tomoyo_set_string(head,
365 container_of(head->r.ns,
366 struct tomoyo_policy_namespace,
367 namespace_list)->name);
368 tomoyo_set_space(head);
369}
370
371/**
372 * tomoyo_print_name_union - Print a tomoyo_name_union.
373 *
374 * @head: Pointer to "struct tomoyo_io_buffer".
375 * @ptr: Pointer to "struct tomoyo_name_union".
376 */
377static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
378 const struct tomoyo_name_union *ptr)
379{
380 tomoyo_set_space(head);
381 if (ptr->group) {
382 tomoyo_set_string(head, "@");
383 tomoyo_set_string(head, ptr->group->group_name->name);
384 } else {
385 tomoyo_set_string(head, ptr->filename->name);
386 }
387}
388
389/**
390 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
391 *
392 * @head: Pointer to "struct tomoyo_io_buffer".
393 * @ptr: Pointer to "struct tomoyo_name_union".
394 *
395 * Returns nothing.
396 */
397static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
398 const struct tomoyo_name_union *ptr)
399{
400 if (ptr->group) {
401 tomoyo_set_string(head, "@");
402 tomoyo_set_string(head, ptr->group->group_name->name);
403 } else {
404 tomoyo_set_string(head, "\"");
405 tomoyo_set_string(head, ptr->filename->name);
406 tomoyo_set_string(head, "\"");
407 }
408}
409
410/**
411 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
412 *
413 * @head: Pointer to "struct tomoyo_io_buffer".
414 * @ptr: Pointer to "struct tomoyo_number_union".
415 *
416 * Returns nothing.
417 */
418static void tomoyo_print_number_union_nospace
419(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
420{
421 if (ptr->group) {
422 tomoyo_set_string(head, "@");
423 tomoyo_set_string(head, ptr->group->group_name->name);
424 } else {
425 int i;
426 unsigned long min = ptr->values[0];
427 const unsigned long max = ptr->values[1];
428 u8 min_type = ptr->value_type[0];
429 const u8 max_type = ptr->value_type[1];
430 char buffer[128];
431
432 buffer[0] = '\0';
433 for (i = 0; i < 2; i++) {
434 switch (min_type) {
435 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
436 tomoyo_addprintf(buffer, sizeof(buffer),
437 "0x%lX", min);
438 break;
439 case TOMOYO_VALUE_TYPE_OCTAL:
440 tomoyo_addprintf(buffer, sizeof(buffer),
441 "0%lo", min);
442 break;
443 default:
444 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
445 min);
446 break;
447 }
448 if (min == max && min_type == max_type)
449 break;
450 tomoyo_addprintf(buffer, sizeof(buffer), "-");
451 min_type = max_type;
452 min = max;
453 }
454 tomoyo_io_printf(head, "%s", buffer);
455 }
456}
457
458/**
459 * tomoyo_print_number_union - Print a tomoyo_number_union.
460 *
461 * @head: Pointer to "struct tomoyo_io_buffer".
462 * @ptr: Pointer to "struct tomoyo_number_union".
463 *
464 * Returns nothing.
465 */
466static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
467 const struct tomoyo_number_union *ptr)
468{
469 tomoyo_set_space(head);
470 tomoyo_print_number_union_nospace(head, ptr);
471}
472
473/**
474 * tomoyo_assign_profile - Create a new profile.
475 *
476 * @ns: Pointer to "struct tomoyo_policy_namespace".
477 * @profile: Profile number to create.
478 *
479 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
480 */
481static struct tomoyo_profile *tomoyo_assign_profile
482(struct tomoyo_policy_namespace *ns, const unsigned int profile)
483{
484 struct tomoyo_profile *ptr;
485 struct tomoyo_profile *entry;
486
487 if (profile >= TOMOYO_MAX_PROFILES)
488 return NULL;
489 ptr = ns->profile_ptr[profile];
490 if (ptr)
491 return ptr;
492 entry = kzalloc(sizeof(*entry), GFP_NOFS | __GFP_NOWARN);
493 if (mutex_lock_interruptible(&tomoyo_policy_lock))
494 goto out;
495 ptr = ns->profile_ptr[profile];
496 if (!ptr && tomoyo_memory_ok(entry)) {
497 ptr = entry;
498 ptr->default_config = TOMOYO_CONFIG_DISABLED |
499 TOMOYO_CONFIG_WANT_GRANT_LOG |
500 TOMOYO_CONFIG_WANT_REJECT_LOG;
501 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
502 sizeof(ptr->config));
503 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
504 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
505 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
506 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
507 mb(); /* Avoid out-of-order execution. */
508 ns->profile_ptr[profile] = ptr;
509 entry = NULL;
510 }
511 mutex_unlock(&tomoyo_policy_lock);
512 out:
513 kfree(entry);
514 return ptr;
515}
516
517/**
518 * tomoyo_profile - Find a profile.
519 *
520 * @ns: Pointer to "struct tomoyo_policy_namespace".
521 * @profile: Profile number to find.
522 *
523 * Returns pointer to "struct tomoyo_profile".
524 */
525struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
526 const u8 profile)
527{
528 static struct tomoyo_profile tomoyo_null_profile;
529 struct tomoyo_profile *ptr = ns->profile_ptr[profile];
530
531 if (!ptr)
532 ptr = &tomoyo_null_profile;
533 return ptr;
534}
535
536/**
537 * tomoyo_find_yesno - Find values for specified keyword.
538 *
539 * @string: String to check.
540 * @find: Name of keyword.
541 *
542 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
543 */
544static s8 tomoyo_find_yesno(const char *string, const char *find)
545{
546 const char *cp = strstr(string, find);
547
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
572 if (cp)
573 sscanf(cp + strlen(find), "=%u", i);
574}
575
576/**
577 * tomoyo_set_mode - Set mode for specified profile.
578 *
579 * @name: Name of functionality.
580 * @value: Mode for @name.
581 * @profile: Pointer to "struct tomoyo_profile".
582 *
583 * Returns 0 on success, negative value otherwise.
584 */
585static int tomoyo_set_mode(char *name, const char *value,
586 struct tomoyo_profile *profile)
587{
588 u8 i;
589 u8 config;
590
591 if (!strcmp(name, "CONFIG")) {
592 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
593 config = profile->default_config;
594 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
595 config = 0;
596 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
597 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
598 int len = 0;
599
600 if (i < TOMOYO_MAX_MAC_INDEX) {
601 const u8 c = tomoyo_index2category[i];
602 const char *category =
603 tomoyo_category_keywords[c];
604
605 len = strlen(category);
606 if (strncmp(name, category, len) ||
607 name[len++] != ':' || name[len++] != ':')
608 continue;
609 }
610 if (strcmp(name + len, tomoyo_mac_keywords[i]))
611 continue;
612 config = profile->config[i];
613 break;
614 }
615 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
616 return -EINVAL;
617 } else {
618 return -EINVAL;
619 }
620 if (strstr(value, "use_default")) {
621 config = TOMOYO_CONFIG_USE_DEFAULT;
622 } else {
623 u8 mode;
624
625 for (mode = 0; mode < 4; mode++)
626 if (strstr(value, tomoyo_mode[mode]))
627 /*
628 * Update lower 3 bits in order to distinguish
629 * 'config' from 'TOMOYO_CONFIG_USE_DEFAULT'.
630 */
631 config = (config & ~7) | mode;
632 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
633 switch (tomoyo_find_yesno(value, "grant_log")) {
634 case 1:
635 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
636 break;
637 case 0:
638 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
639 break;
640 }
641 switch (tomoyo_find_yesno(value, "reject_log")) {
642 case 1:
643 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
644 break;
645 case 0:
646 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
647 break;
648 }
649 }
650 }
651 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
652 profile->config[i] = config;
653 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
654 profile->default_config = config;
655 return 0;
656}
657
658/**
659 * tomoyo_write_profile - Write profile table.
660 *
661 * @head: Pointer to "struct tomoyo_io_buffer".
662 *
663 * Returns 0 on success, negative value otherwise.
664 */
665static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
666{
667 char *data = head->write_buf;
668 unsigned int i;
669 char *cp;
670 struct tomoyo_profile *profile;
671
672 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
673 == 1)
674 return 0;
675 i = simple_strtoul(data, &cp, 10);
676 if (*cp != '-')
677 return -EINVAL;
678 data = cp + 1;
679 profile = tomoyo_assign_profile(head->w.ns, i);
680 if (!profile)
681 return -EINVAL;
682 cp = strchr(data, '=');
683 if (!cp)
684 return -EINVAL;
685 *cp++ = '\0';
686 if (!strcmp(data, "COMMENT")) {
687 static DEFINE_SPINLOCK(lock);
688 const struct tomoyo_path_info *new_comment
689 = tomoyo_get_name(cp);
690 const struct tomoyo_path_info *old_comment;
691
692 if (!new_comment)
693 return -ENOMEM;
694 spin_lock(&lock);
695 old_comment = profile->comment;
696 profile->comment = new_comment;
697 spin_unlock(&lock);
698 tomoyo_put_name(old_comment);
699 return 0;
700 }
701 if (!strcmp(data, "PREFERENCE")) {
702 for (i = 0; i < TOMOYO_MAX_PREF; i++)
703 tomoyo_set_uint(&profile->pref[i], cp,
704 tomoyo_pref_keywords[i]);
705 return 0;
706 }
707 return tomoyo_set_mode(data, cp, profile);
708}
709
710/**
711 * tomoyo_print_config - Print mode for specified functionality.
712 *
713 * @head: Pointer to "struct tomoyo_io_buffer".
714 * @config: Mode for that functionality.
715 *
716 * Returns nothing.
717 *
718 * Caller prints functionality's name.
719 */
720static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
721{
722 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
723 tomoyo_mode[config & 3],
724 str_yes_no(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
725 str_yes_no(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
726}
727
728/**
729 * tomoyo_read_profile - Read profile table.
730 *
731 * @head: Pointer to "struct tomoyo_io_buffer".
732 *
733 * Returns nothing.
734 */
735static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
736{
737 u8 index;
738 struct tomoyo_policy_namespace *ns =
739 container_of(head->r.ns, typeof(*ns), namespace_list);
740 const struct tomoyo_profile *profile;
741
742 if (head->r.eof)
743 return;
744 next:
745 index = head->r.index;
746 profile = ns->profile_ptr[index];
747 switch (head->r.step) {
748 case 0:
749 tomoyo_print_namespace(head);
750 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
751 ns->profile_version);
752 head->r.step++;
753 break;
754 case 1:
755 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
756 head->r.index++)
757 if (ns->profile_ptr[head->r.index])
758 break;
759 if (head->r.index == TOMOYO_MAX_PROFILES) {
760 head->r.eof = true;
761 return;
762 }
763 head->r.step++;
764 break;
765 case 2:
766 {
767 u8 i;
768 const struct tomoyo_path_info *comment =
769 profile->comment;
770
771 tomoyo_print_namespace(head);
772 tomoyo_io_printf(head, "%u-COMMENT=", index);
773 tomoyo_set_string(head, comment ? comment->name : "");
774 tomoyo_set_lf(head);
775 tomoyo_print_namespace(head);
776 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
777 for (i = 0; i < TOMOYO_MAX_PREF; i++)
778 tomoyo_io_printf(head, "%s=%u ",
779 tomoyo_pref_keywords[i],
780 profile->pref[i]);
781 tomoyo_set_string(head, "}\n");
782 head->r.step++;
783 }
784 break;
785 case 3:
786 {
787 tomoyo_print_namespace(head);
788 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
789 tomoyo_print_config(head, profile->default_config);
790 head->r.bit = 0;
791 head->r.step++;
792 }
793 break;
794 case 4:
795 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
796 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
797 const u8 i = head->r.bit;
798 const u8 config = profile->config[i];
799
800 if (config == TOMOYO_CONFIG_USE_DEFAULT)
801 continue;
802 tomoyo_print_namespace(head);
803 if (i < TOMOYO_MAX_MAC_INDEX)
804 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
805 index,
806 tomoyo_category_keywords
807 [tomoyo_index2category[i]],
808 tomoyo_mac_keywords[i]);
809 else
810 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
811 tomoyo_mac_keywords[i]);
812 tomoyo_print_config(head, config);
813 head->r.bit++;
814 break;
815 }
816 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
817 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
818 head->r.index++;
819 head->r.step = 1;
820 }
821 break;
822 }
823 if (tomoyo_flush(head))
824 goto next;
825}
826
827/**
828 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
829 *
830 * @a: Pointer to "struct tomoyo_acl_head".
831 * @b: Pointer to "struct tomoyo_acl_head".
832 *
833 * Returns true if @a == @b, false otherwise.
834 */
835static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
836 const struct tomoyo_acl_head *b)
837{
838 return container_of(a, struct tomoyo_manager, head)->manager ==
839 container_of(b, struct tomoyo_manager, head)->manager;
840}
841
842/**
843 * tomoyo_update_manager_entry - Add a manager entry.
844 *
845 * @manager: The path to manager or the domainnamme.
846 * @is_delete: True if it is a delete request.
847 *
848 * Returns 0 on success, negative value otherwise.
849 *
850 * Caller holds tomoyo_read_lock().
851 */
852static int tomoyo_update_manager_entry(const char *manager,
853 const bool is_delete)
854{
855 struct tomoyo_manager e = { };
856 struct tomoyo_acl_param param = {
857 /* .ns = &tomoyo_kernel_namespace, */
858 .is_delete = is_delete,
859 .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
860 };
861 int error = is_delete ? -ENOENT : -ENOMEM;
862
863 if (!tomoyo_correct_domain(manager) &&
864 !tomoyo_correct_word(manager))
865 return -EINVAL;
866 e.manager = tomoyo_get_name(manager);
867 if (e.manager) {
868 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m,
869 tomoyo_same_manager);
870 tomoyo_put_name(e.manager);
871 }
872 return error;
873}
874
875/**
876 * tomoyo_write_manager - Write manager policy.
877 *
878 * @head: Pointer to "struct tomoyo_io_buffer".
879 *
880 * Returns 0 on success, negative value otherwise.
881 *
882 * Caller holds tomoyo_read_lock().
883 */
884static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
885{
886 char *data = head->write_buf;
887
888 if (!strcmp(data, "manage_by_non_root")) {
889 tomoyo_manage_by_non_root = !head->w.is_delete;
890 return 0;
891 }
892 return tomoyo_update_manager_entry(data, head->w.is_delete);
893}
894
895/**
896 * tomoyo_read_manager - Read manager policy.
897 *
898 * @head: Pointer to "struct tomoyo_io_buffer".
899 *
900 * Caller holds tomoyo_read_lock().
901 */
902static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
903{
904 if (head->r.eof)
905 return;
906 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
907 struct tomoyo_manager *ptr =
908 list_entry(head->r.acl, typeof(*ptr), head.list);
909
910 if (ptr->head.is_deleted)
911 continue;
912 if (!tomoyo_flush(head))
913 return;
914 tomoyo_set_string(head, ptr->manager->name);
915 tomoyo_set_lf(head);
916 }
917 head->r.eof = true;
918}
919
920/**
921 * tomoyo_manager - Check whether the current process is a policy manager.
922 *
923 * Returns true if the current process is permitted to modify policy
924 * via /sys/kernel/security/tomoyo/ interface.
925 *
926 * Caller holds tomoyo_read_lock().
927 */
928static bool tomoyo_manager(void)
929{
930 struct tomoyo_manager *ptr;
931 const char *exe;
932 const struct task_struct *task = current;
933 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
934 bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
935
936 if (!tomoyo_policy_loaded)
937 return true;
938 if (!tomoyo_manage_by_non_root &&
939 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) ||
940 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
941 return false;
942 exe = tomoyo_get_exe();
943 if (!exe)
944 return false;
945 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
946 srcu_read_lock_held(&tomoyo_ss)) {
947 if (!ptr->head.is_deleted &&
948 (!tomoyo_pathcmp(domainname, ptr->manager) ||
949 !strcmp(exe, ptr->manager->name))) {
950 found = true;
951 break;
952 }
953 }
954 if (!found) { /* Reduce error messages. */
955 static pid_t last_pid;
956 const pid_t pid = current->pid;
957
958 if (last_pid != pid) {
959 pr_warn("%s ( %s ) is not permitted to update policies.\n",
960 domainname->name, exe);
961 last_pid = pid;
962 }
963 }
964 kfree(exe);
965 return found;
966}
967
968static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
969(unsigned int serial);
970
971/**
972 * tomoyo_select_domain - Parse select command.
973 *
974 * @head: Pointer to "struct tomoyo_io_buffer".
975 * @data: String to parse.
976 *
977 * Returns true on success, false otherwise.
978 *
979 * Caller holds tomoyo_read_lock().
980 */
981static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
982 const char *data)
983{
984 unsigned int pid;
985 struct tomoyo_domain_info *domain = NULL;
986 bool global_pid = false;
987
988 if (strncmp(data, "select ", 7))
989 return false;
990 data += 7;
991 if (sscanf(data, "pid=%u", &pid) == 1 ||
992 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
993 struct task_struct *p;
994
995 rcu_read_lock();
996 if (global_pid)
997 p = find_task_by_pid_ns(pid, &init_pid_ns);
998 else
999 p = find_task_by_vpid(pid);
1000 if (p)
1001 domain = tomoyo_task(p)->domain_info;
1002 rcu_read_unlock();
1003 } else if (!strncmp(data, "domain=", 7)) {
1004 if (tomoyo_domain_def(data + 7))
1005 domain = tomoyo_find_domain(data + 7);
1006 } else if (sscanf(data, "Q=%u", &pid) == 1) {
1007 domain = tomoyo_find_domain_by_qid(pid);
1008 } else
1009 return false;
1010 head->w.domain = domain;
1011 /* Accessing read_buf is safe because head->io_sem is held. */
1012 if (!head->read_buf)
1013 return true; /* Do nothing if open(O_WRONLY). */
1014 memset(&head->r, 0, sizeof(head->r));
1015 head->r.print_this_domain_only = true;
1016 if (domain)
1017 head->r.domain = &domain->list;
1018 else
1019 head->r.eof = true;
1020 tomoyo_io_printf(head, "# select %s\n", data);
1021 if (domain && domain->is_deleted)
1022 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1023 return true;
1024}
1025
1026/**
1027 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1028 *
1029 * @a: Pointer to "struct tomoyo_acl_info".
1030 * @b: Pointer to "struct tomoyo_acl_info".
1031 *
1032 * Returns true if @a == @b, false otherwise.
1033 */
1034static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1035 const struct tomoyo_acl_info *b)
1036{
1037 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1038 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1039
1040 return p1->domainname == p2->domainname;
1041}
1042
1043/**
1044 * tomoyo_write_task - Update task related list.
1045 *
1046 * @param: Pointer to "struct tomoyo_acl_param".
1047 *
1048 * Returns 0 on success, negative value otherwise.
1049 *
1050 * Caller holds tomoyo_read_lock().
1051 */
1052static int tomoyo_write_task(struct tomoyo_acl_param *param)
1053{
1054 int error = -EINVAL;
1055
1056 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
1057 struct tomoyo_task_acl e = {
1058 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1059 .domainname = tomoyo_get_domainname(param),
1060 };
1061
1062 if (e.domainname)
1063 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1064 tomoyo_same_task_acl,
1065 NULL);
1066 tomoyo_put_name(e.domainname);
1067 }
1068 return error;
1069}
1070
1071/**
1072 * tomoyo_delete_domain - Delete a domain.
1073 *
1074 * @domainname: The name of domain.
1075 *
1076 * Returns 0 on success, negative value otherwise.
1077 *
1078 * Caller holds tomoyo_read_lock().
1079 */
1080static int tomoyo_delete_domain(char *domainname)
1081{
1082 struct tomoyo_domain_info *domain;
1083 struct tomoyo_path_info name;
1084
1085 name.name = domainname;
1086 tomoyo_fill_path_info(&name);
1087 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1088 return -EINTR;
1089 /* Is there an active domain? */
1090 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1091 srcu_read_lock_held(&tomoyo_ss)) {
1092 /* Never delete tomoyo_kernel_domain */
1093 if (domain == &tomoyo_kernel_domain)
1094 continue;
1095 if (domain->is_deleted ||
1096 tomoyo_pathcmp(domain->domainname, &name))
1097 continue;
1098 domain->is_deleted = true;
1099 break;
1100 }
1101 mutex_unlock(&tomoyo_policy_lock);
1102 return 0;
1103}
1104
1105/**
1106 * tomoyo_write_domain2 - Write domain policy.
1107 *
1108 * @ns: Pointer to "struct tomoyo_policy_namespace".
1109 * @list: Pointer to "struct list_head".
1110 * @data: Policy to be interpreted.
1111 * @is_delete: True if it is a delete request.
1112 *
1113 * Returns 0 on success, negative value otherwise.
1114 *
1115 * Caller holds tomoyo_read_lock().
1116 */
1117static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1118 struct list_head *list, char *data,
1119 const bool is_delete)
1120{
1121 struct tomoyo_acl_param param = {
1122 .ns = ns,
1123 .list = list,
1124 .data = data,
1125 .is_delete = is_delete,
1126 };
1127 static const struct {
1128 const char *keyword;
1129 int (*write)(struct tomoyo_acl_param *param);
1130 } tomoyo_callback[5] = {
1131 { "file ", tomoyo_write_file },
1132 { "network inet ", tomoyo_write_inet_network },
1133 { "network unix ", tomoyo_write_unix_network },
1134 { "misc ", tomoyo_write_misc },
1135 { "task ", tomoyo_write_task },
1136 };
1137 u8 i;
1138
1139 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1140 if (!tomoyo_str_starts(¶m.data,
1141 tomoyo_callback[i].keyword))
1142 continue;
1143 return tomoyo_callback[i].write(¶m);
1144 }
1145 return -EINVAL;
1146}
1147
1148/* String table for domain flags. */
1149const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1150 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1151 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1152};
1153
1154/**
1155 * tomoyo_write_domain - Write domain policy.
1156 *
1157 * @head: Pointer to "struct tomoyo_io_buffer".
1158 *
1159 * Returns 0 on success, negative value otherwise.
1160 *
1161 * Caller holds tomoyo_read_lock().
1162 */
1163static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1164{
1165 char *data = head->write_buf;
1166 struct tomoyo_policy_namespace *ns;
1167 struct tomoyo_domain_info *domain = head->w.domain;
1168 const bool is_delete = head->w.is_delete;
1169 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1170 unsigned int idx;
1171
1172 if (*data == '<') {
1173 int ret = 0;
1174
1175 domain = NULL;
1176 if (is_delete)
1177 ret = tomoyo_delete_domain(data);
1178 else if (is_select)
1179 domain = tomoyo_find_domain(data);
1180 else
1181 domain = tomoyo_assign_domain(data, false);
1182 head->w.domain = domain;
1183 return ret;
1184 }
1185 if (!domain)
1186 return -EINVAL;
1187 ns = domain->ns;
1188 if (sscanf(data, "use_profile %u", &idx) == 1
1189 && idx < TOMOYO_MAX_PROFILES) {
1190 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1191 if (!is_delete)
1192 domain->profile = (u8) idx;
1193 return 0;
1194 }
1195 if (sscanf(data, "use_group %u\n", &idx) == 1
1196 && idx < TOMOYO_MAX_ACL_GROUPS) {
1197 if (!is_delete)
1198 set_bit(idx, domain->group);
1199 else
1200 clear_bit(idx, domain->group);
1201 return 0;
1202 }
1203 for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1204 const char *cp = tomoyo_dif[idx];
1205
1206 if (strncmp(data, cp, strlen(cp) - 1))
1207 continue;
1208 domain->flags[idx] = !is_delete;
1209 return 0;
1210 }
1211 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1212 is_delete);
1213}
1214
1215/**
1216 * tomoyo_print_condition - Print condition part.
1217 *
1218 * @head: Pointer to "struct tomoyo_io_buffer".
1219 * @cond: Pointer to "struct tomoyo_condition".
1220 *
1221 * Returns true on success, false otherwise.
1222 */
1223static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1224 const struct tomoyo_condition *cond)
1225{
1226 switch (head->r.cond_step) {
1227 case 0:
1228 head->r.cond_index = 0;
1229 head->r.cond_step++;
1230 if (cond->transit) {
1231 tomoyo_set_space(head);
1232 tomoyo_set_string(head, cond->transit->name);
1233 }
1234 fallthrough;
1235 case 1:
1236 {
1237 const u16 condc = cond->condc;
1238 const struct tomoyo_condition_element *condp =
1239 (typeof(condp)) (cond + 1);
1240 const struct tomoyo_number_union *numbers_p =
1241 (typeof(numbers_p)) (condp + condc);
1242 const struct tomoyo_name_union *names_p =
1243 (typeof(names_p))
1244 (numbers_p + cond->numbers_count);
1245 const struct tomoyo_argv *argv =
1246 (typeof(argv)) (names_p + cond->names_count);
1247 const struct tomoyo_envp *envp =
1248 (typeof(envp)) (argv + cond->argc);
1249 u16 skip;
1250
1251 for (skip = 0; skip < head->r.cond_index; skip++) {
1252 const u8 left = condp->left;
1253 const u8 right = condp->right;
1254
1255 condp++;
1256 switch (left) {
1257 case TOMOYO_ARGV_ENTRY:
1258 argv++;
1259 continue;
1260 case TOMOYO_ENVP_ENTRY:
1261 envp++;
1262 continue;
1263 case TOMOYO_NUMBER_UNION:
1264 numbers_p++;
1265 break;
1266 }
1267 switch (right) {
1268 case TOMOYO_NAME_UNION:
1269 names_p++;
1270 break;
1271 case TOMOYO_NUMBER_UNION:
1272 numbers_p++;
1273 break;
1274 }
1275 }
1276 while (head->r.cond_index < condc) {
1277 const u8 match = condp->equals;
1278 const u8 left = condp->left;
1279 const u8 right = condp->right;
1280
1281 if (!tomoyo_flush(head))
1282 return false;
1283 condp++;
1284 head->r.cond_index++;
1285 tomoyo_set_space(head);
1286 switch (left) {
1287 case TOMOYO_ARGV_ENTRY:
1288 tomoyo_io_printf(head,
1289 "exec.argv[%lu]%s=\"",
1290 argv->index, argv->is_not ? "!" : "");
1291 tomoyo_set_string(head,
1292 argv->value->name);
1293 tomoyo_set_string(head, "\"");
1294 argv++;
1295 continue;
1296 case TOMOYO_ENVP_ENTRY:
1297 tomoyo_set_string(head,
1298 "exec.envp[\"");
1299 tomoyo_set_string(head,
1300 envp->name->name);
1301 tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1302 if (envp->value) {
1303 tomoyo_set_string(head, "\"");
1304 tomoyo_set_string(head, envp->value->name);
1305 tomoyo_set_string(head, "\"");
1306 } else {
1307 tomoyo_set_string(head,
1308 "NULL");
1309 }
1310 envp++;
1311 continue;
1312 case TOMOYO_NUMBER_UNION:
1313 tomoyo_print_number_union_nospace
1314 (head, numbers_p++);
1315 break;
1316 default:
1317 tomoyo_set_string(head,
1318 tomoyo_condition_keyword[left]);
1319 break;
1320 }
1321 tomoyo_set_string(head, match ? "=" : "!=");
1322 switch (right) {
1323 case TOMOYO_NAME_UNION:
1324 tomoyo_print_name_union_quoted
1325 (head, names_p++);
1326 break;
1327 case TOMOYO_NUMBER_UNION:
1328 tomoyo_print_number_union_nospace
1329 (head, numbers_p++);
1330 break;
1331 default:
1332 tomoyo_set_string(head,
1333 tomoyo_condition_keyword[right]);
1334 break;
1335 }
1336 }
1337 }
1338 head->r.cond_step++;
1339 fallthrough;
1340 case 2:
1341 if (!tomoyo_flush(head))
1342 break;
1343 head->r.cond_step++;
1344 fallthrough;
1345 case 3:
1346 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1347 tomoyo_io_printf(head, " grant_log=%s",
1348 str_yes_no(cond->grant_log ==
1349 TOMOYO_GRANTLOG_YES));
1350 tomoyo_set_lf(head);
1351 return true;
1352 }
1353 return false;
1354}
1355
1356/**
1357 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1358 *
1359 * @head: Pointer to "struct tomoyo_io_buffer".
1360 * @category: Category name.
1361 *
1362 * Returns nothing.
1363 */
1364static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1365 const char *category)
1366{
1367 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1368 tomoyo_print_namespace(head);
1369 tomoyo_io_printf(head, "acl_group %u ",
1370 head->r.acl_group_index);
1371 }
1372 tomoyo_set_string(head, category);
1373}
1374
1375/**
1376 * tomoyo_print_entry - Print an ACL entry.
1377 *
1378 * @head: Pointer to "struct tomoyo_io_buffer".
1379 * @acl: Pointer to an ACL entry.
1380 *
1381 * Returns true on success, false otherwise.
1382 */
1383static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1384 struct tomoyo_acl_info *acl)
1385{
1386 const u8 acl_type = acl->type;
1387 bool first = true;
1388 u8 bit;
1389
1390 if (head->r.print_cond_part)
1391 goto print_cond_part;
1392 if (acl->is_deleted)
1393 return true;
1394 if (!tomoyo_flush(head))
1395 return false;
1396 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1397 struct tomoyo_path_acl *ptr =
1398 container_of(acl, typeof(*ptr), head);
1399 const u16 perm = ptr->perm;
1400
1401 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1402 if (!(perm & (1 << bit)))
1403 continue;
1404 if (head->r.print_transition_related_only &&
1405 bit != TOMOYO_TYPE_EXECUTE)
1406 continue;
1407 if (first) {
1408 tomoyo_set_group(head, "file ");
1409 first = false;
1410 } else {
1411 tomoyo_set_slash(head);
1412 }
1413 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1414 }
1415 if (first)
1416 return true;
1417 tomoyo_print_name_union(head, &ptr->name);
1418 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1419 struct tomoyo_task_acl *ptr =
1420 container_of(acl, typeof(*ptr), head);
1421
1422 tomoyo_set_group(head, "task ");
1423 tomoyo_set_string(head, "manual_domain_transition ");
1424 tomoyo_set_string(head, ptr->domainname->name);
1425 } else if (head->r.print_transition_related_only) {
1426 return true;
1427 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1428 struct tomoyo_path2_acl *ptr =
1429 container_of(acl, typeof(*ptr), head);
1430 const u8 perm = ptr->perm;
1431
1432 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1433 if (!(perm & (1 << bit)))
1434 continue;
1435 if (first) {
1436 tomoyo_set_group(head, "file ");
1437 first = false;
1438 } else {
1439 tomoyo_set_slash(head);
1440 }
1441 tomoyo_set_string(head, tomoyo_mac_keywords
1442 [tomoyo_pp2mac[bit]]);
1443 }
1444 if (first)
1445 return true;
1446 tomoyo_print_name_union(head, &ptr->name1);
1447 tomoyo_print_name_union(head, &ptr->name2);
1448 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1449 struct tomoyo_path_number_acl *ptr =
1450 container_of(acl, typeof(*ptr), head);
1451 const u8 perm = ptr->perm;
1452
1453 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1454 if (!(perm & (1 << bit)))
1455 continue;
1456 if (first) {
1457 tomoyo_set_group(head, "file ");
1458 first = false;
1459 } else {
1460 tomoyo_set_slash(head);
1461 }
1462 tomoyo_set_string(head, tomoyo_mac_keywords
1463 [tomoyo_pn2mac[bit]]);
1464 }
1465 if (first)
1466 return true;
1467 tomoyo_print_name_union(head, &ptr->name);
1468 tomoyo_print_number_union(head, &ptr->number);
1469 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1470 struct tomoyo_mkdev_acl *ptr =
1471 container_of(acl, typeof(*ptr), head);
1472 const u8 perm = ptr->perm;
1473
1474 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1475 if (!(perm & (1 << bit)))
1476 continue;
1477 if (first) {
1478 tomoyo_set_group(head, "file ");
1479 first = false;
1480 } else {
1481 tomoyo_set_slash(head);
1482 }
1483 tomoyo_set_string(head, tomoyo_mac_keywords
1484 [tomoyo_pnnn2mac[bit]]);
1485 }
1486 if (first)
1487 return true;
1488 tomoyo_print_name_union(head, &ptr->name);
1489 tomoyo_print_number_union(head, &ptr->mode);
1490 tomoyo_print_number_union(head, &ptr->major);
1491 tomoyo_print_number_union(head, &ptr->minor);
1492 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1493 struct tomoyo_inet_acl *ptr =
1494 container_of(acl, typeof(*ptr), head);
1495 const u8 perm = ptr->perm;
1496
1497 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1498 if (!(perm & (1 << bit)))
1499 continue;
1500 if (first) {
1501 tomoyo_set_group(head, "network inet ");
1502 tomoyo_set_string(head, tomoyo_proto_keyword
1503 [ptr->protocol]);
1504 tomoyo_set_space(head);
1505 first = false;
1506 } else {
1507 tomoyo_set_slash(head);
1508 }
1509 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1510 }
1511 if (first)
1512 return true;
1513 tomoyo_set_space(head);
1514 if (ptr->address.group) {
1515 tomoyo_set_string(head, "@");
1516 tomoyo_set_string(head, ptr->address.group->group_name
1517 ->name);
1518 } else {
1519 char buf[128];
1520
1521 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1522 tomoyo_io_printf(head, "%s", buf);
1523 }
1524 tomoyo_print_number_union(head, &ptr->port);
1525 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1526 struct tomoyo_unix_acl *ptr =
1527 container_of(acl, typeof(*ptr), head);
1528 const u8 perm = ptr->perm;
1529
1530 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1531 if (!(perm & (1 << bit)))
1532 continue;
1533 if (first) {
1534 tomoyo_set_group(head, "network unix ");
1535 tomoyo_set_string(head, tomoyo_proto_keyword
1536 [ptr->protocol]);
1537 tomoyo_set_space(head);
1538 first = false;
1539 } else {
1540 tomoyo_set_slash(head);
1541 }
1542 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1543 }
1544 if (first)
1545 return true;
1546 tomoyo_print_name_union(head, &ptr->name);
1547 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1548 struct tomoyo_mount_acl *ptr =
1549 container_of(acl, typeof(*ptr), head);
1550
1551 tomoyo_set_group(head, "file mount");
1552 tomoyo_print_name_union(head, &ptr->dev_name);
1553 tomoyo_print_name_union(head, &ptr->dir_name);
1554 tomoyo_print_name_union(head, &ptr->fs_type);
1555 tomoyo_print_number_union(head, &ptr->flags);
1556 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1557 struct tomoyo_env_acl *ptr =
1558 container_of(acl, typeof(*ptr), head);
1559
1560 tomoyo_set_group(head, "misc env ");
1561 tomoyo_set_string(head, ptr->env->name);
1562 }
1563 if (acl->cond) {
1564 head->r.print_cond_part = true;
1565 head->r.cond_step = 0;
1566 if (!tomoyo_flush(head))
1567 return false;
1568print_cond_part:
1569 if (!tomoyo_print_condition(head, acl->cond))
1570 return false;
1571 head->r.print_cond_part = false;
1572 } else {
1573 tomoyo_set_lf(head);
1574 }
1575 return true;
1576}
1577
1578/**
1579 * tomoyo_read_domain2 - Read domain policy.
1580 *
1581 * @head: Pointer to "struct tomoyo_io_buffer".
1582 * @list: Pointer to "struct list_head".
1583 *
1584 * Caller holds tomoyo_read_lock().
1585 *
1586 * Returns true on success, false otherwise.
1587 */
1588static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1589 struct list_head *list)
1590{
1591 list_for_each_cookie(head->r.acl, list) {
1592 struct tomoyo_acl_info *ptr =
1593 list_entry(head->r.acl, typeof(*ptr), list);
1594
1595 if (!tomoyo_print_entry(head, ptr))
1596 return false;
1597 }
1598 head->r.acl = NULL;
1599 return true;
1600}
1601
1602/**
1603 * tomoyo_read_domain - Read domain policy.
1604 *
1605 * @head: Pointer to "struct tomoyo_io_buffer".
1606 *
1607 * Caller holds tomoyo_read_lock().
1608 */
1609static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1610{
1611 if (head->r.eof)
1612 return;
1613 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1614 struct tomoyo_domain_info *domain =
1615 list_entry(head->r.domain, typeof(*domain), list);
1616 u8 i;
1617
1618 switch (head->r.step) {
1619 case 0:
1620 if (domain->is_deleted &&
1621 !head->r.print_this_domain_only)
1622 continue;
1623 /* Print domainname and flags. */
1624 tomoyo_set_string(head, domain->domainname->name);
1625 tomoyo_set_lf(head);
1626 tomoyo_io_printf(head, "use_profile %u\n",
1627 domain->profile);
1628 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1629 if (domain->flags[i])
1630 tomoyo_set_string(head, tomoyo_dif[i]);
1631 head->r.index = 0;
1632 head->r.step++;
1633 fallthrough;
1634 case 1:
1635 while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1636 i = head->r.index++;
1637 if (!test_bit(i, domain->group))
1638 continue;
1639 tomoyo_io_printf(head, "use_group %u\n", i);
1640 if (!tomoyo_flush(head))
1641 return;
1642 }
1643 head->r.index = 0;
1644 head->r.step++;
1645 tomoyo_set_lf(head);
1646 fallthrough;
1647 case 2:
1648 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1649 return;
1650 head->r.step++;
1651 if (!tomoyo_set_lf(head))
1652 return;
1653 fallthrough;
1654 case 3:
1655 head->r.step = 0;
1656 if (head->r.print_this_domain_only)
1657 goto done;
1658 }
1659 }
1660 done:
1661 head->r.eof = true;
1662}
1663
1664/**
1665 * tomoyo_write_pid: Specify PID to obtain domainname.
1666 *
1667 * @head: Pointer to "struct tomoyo_io_buffer".
1668 *
1669 * Returns 0.
1670 */
1671static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1672{
1673 head->r.eof = false;
1674 return 0;
1675}
1676
1677/**
1678 * tomoyo_read_pid - Get domainname of the specified PID.
1679 *
1680 * @head: Pointer to "struct tomoyo_io_buffer".
1681 *
1682 * Returns the domainname which the specified PID is in on success,
1683 * empty string otherwise.
1684 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1685 * using read()/write() interface rather than sysctl() interface.
1686 */
1687static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1688{
1689 char *buf = head->write_buf;
1690 bool global_pid = false;
1691 unsigned int pid;
1692 struct task_struct *p;
1693 struct tomoyo_domain_info *domain = NULL;
1694
1695 /* Accessing write_buf is safe because head->io_sem is held. */
1696 if (!buf) {
1697 head->r.eof = true;
1698 return; /* Do nothing if open(O_RDONLY). */
1699 }
1700 if (head->r.w_pos || head->r.eof)
1701 return;
1702 head->r.eof = true;
1703 if (tomoyo_str_starts(&buf, "global-pid "))
1704 global_pid = true;
1705 if (kstrtouint(buf, 10, &pid))
1706 return;
1707 rcu_read_lock();
1708 if (global_pid)
1709 p = find_task_by_pid_ns(pid, &init_pid_ns);
1710 else
1711 p = find_task_by_vpid(pid);
1712 if (p)
1713 domain = tomoyo_task(p)->domain_info;
1714 rcu_read_unlock();
1715 if (!domain)
1716 return;
1717 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1718 tomoyo_set_string(head, domain->domainname->name);
1719}
1720
1721/* String table for domain transition control keywords. */
1722static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1723 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1724 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1725 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1726 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1727 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1728 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1729};
1730
1731/* String table for grouping keywords. */
1732static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1733 [TOMOYO_PATH_GROUP] = "path_group ",
1734 [TOMOYO_NUMBER_GROUP] = "number_group ",
1735 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1736};
1737
1738/**
1739 * tomoyo_write_exception - Write exception policy.
1740 *
1741 * @head: Pointer to "struct tomoyo_io_buffer".
1742 *
1743 * Returns 0 on success, negative value otherwise.
1744 *
1745 * Caller holds tomoyo_read_lock().
1746 */
1747static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1748{
1749 const bool is_delete = head->w.is_delete;
1750 struct tomoyo_acl_param param = {
1751 .ns = head->w.ns,
1752 .is_delete = is_delete,
1753 .data = head->write_buf,
1754 };
1755 u8 i;
1756
1757 if (tomoyo_str_starts(¶m.data, "aggregator "))
1758 return tomoyo_write_aggregator(¶m);
1759 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1760 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i]))
1761 return tomoyo_write_transition_control(¶m, i);
1762 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1763 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i]))
1764 return tomoyo_write_group(¶m, i);
1765 if (tomoyo_str_starts(¶m.data, "acl_group ")) {
1766 unsigned int group;
1767 char *data;
1768
1769 group = simple_strtoul(param.data, &data, 10);
1770 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1771 return tomoyo_write_domain2
1772 (head->w.ns, &head->w.ns->acl_group[group],
1773 data, is_delete);
1774 }
1775 return -EINVAL;
1776}
1777
1778/**
1779 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1780 *
1781 * @head: Pointer to "struct tomoyo_io_buffer".
1782 * @idx: Index number.
1783 *
1784 * Returns true on success, false otherwise.
1785 *
1786 * Caller holds tomoyo_read_lock().
1787 */
1788static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1789{
1790 struct tomoyo_policy_namespace *ns =
1791 container_of(head->r.ns, typeof(*ns), namespace_list);
1792 struct list_head *list = &ns->group_list[idx];
1793
1794 list_for_each_cookie(head->r.group, list) {
1795 struct tomoyo_group *group =
1796 list_entry(head->r.group, typeof(*group), head.list);
1797
1798 list_for_each_cookie(head->r.acl, &group->member_list) {
1799 struct tomoyo_acl_head *ptr =
1800 list_entry(head->r.acl, typeof(*ptr), list);
1801
1802 if (ptr->is_deleted)
1803 continue;
1804 if (!tomoyo_flush(head))
1805 return false;
1806 tomoyo_print_namespace(head);
1807 tomoyo_set_string(head, tomoyo_group_name[idx]);
1808 tomoyo_set_string(head, group->group_name->name);
1809 if (idx == TOMOYO_PATH_GROUP) {
1810 tomoyo_set_space(head);
1811 tomoyo_set_string(head, container_of
1812 (ptr, struct tomoyo_path_group,
1813 head)->member_name->name);
1814 } else if (idx == TOMOYO_NUMBER_GROUP) {
1815 tomoyo_print_number_union(head, &container_of
1816 (ptr,
1817 struct tomoyo_number_group,
1818 head)->number);
1819 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1820 char buffer[128];
1821 struct tomoyo_address_group *member =
1822 container_of(ptr, typeof(*member),
1823 head);
1824
1825 tomoyo_print_ip(buffer, sizeof(buffer),
1826 &member->address);
1827 tomoyo_io_printf(head, " %s", buffer);
1828 }
1829 tomoyo_set_lf(head);
1830 }
1831 head->r.acl = NULL;
1832 }
1833 head->r.group = NULL;
1834 return true;
1835}
1836
1837/**
1838 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1839 *
1840 * @head: Pointer to "struct tomoyo_io_buffer".
1841 * @idx: Index number.
1842 *
1843 * Returns true on success, false otherwise.
1844 *
1845 * Caller holds tomoyo_read_lock().
1846 */
1847static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1848{
1849 struct tomoyo_policy_namespace *ns =
1850 container_of(head->r.ns, typeof(*ns), namespace_list);
1851 struct list_head *list = &ns->policy_list[idx];
1852
1853 list_for_each_cookie(head->r.acl, list) {
1854 struct tomoyo_acl_head *acl =
1855 container_of(head->r.acl, typeof(*acl), list);
1856 if (acl->is_deleted)
1857 continue;
1858 if (!tomoyo_flush(head))
1859 return false;
1860 switch (idx) {
1861 case TOMOYO_ID_TRANSITION_CONTROL:
1862 {
1863 struct tomoyo_transition_control *ptr =
1864 container_of(acl, typeof(*ptr), head);
1865
1866 tomoyo_print_namespace(head);
1867 tomoyo_set_string(head, tomoyo_transition_type
1868 [ptr->type]);
1869 tomoyo_set_string(head, ptr->program ?
1870 ptr->program->name : "any");
1871 tomoyo_set_string(head, " from ");
1872 tomoyo_set_string(head, ptr->domainname ?
1873 ptr->domainname->name :
1874 "any");
1875 }
1876 break;
1877 case TOMOYO_ID_AGGREGATOR:
1878 {
1879 struct tomoyo_aggregator *ptr =
1880 container_of(acl, typeof(*ptr), head);
1881
1882 tomoyo_print_namespace(head);
1883 tomoyo_set_string(head, "aggregator ");
1884 tomoyo_set_string(head,
1885 ptr->original_name->name);
1886 tomoyo_set_space(head);
1887 tomoyo_set_string(head,
1888 ptr->aggregated_name->name);
1889 }
1890 break;
1891 default:
1892 continue;
1893 }
1894 tomoyo_set_lf(head);
1895 }
1896 head->r.acl = NULL;
1897 return true;
1898}
1899
1900/**
1901 * tomoyo_read_exception - Read exception policy.
1902 *
1903 * @head: Pointer to "struct tomoyo_io_buffer".
1904 *
1905 * Caller holds tomoyo_read_lock().
1906 */
1907static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1908{
1909 struct tomoyo_policy_namespace *ns =
1910 container_of(head->r.ns, typeof(*ns), namespace_list);
1911
1912 if (head->r.eof)
1913 return;
1914 while (head->r.step < TOMOYO_MAX_POLICY &&
1915 tomoyo_read_policy(head, head->r.step))
1916 head->r.step++;
1917 if (head->r.step < TOMOYO_MAX_POLICY)
1918 return;
1919 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1920 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1921 head->r.step++;
1922 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1923 return;
1924 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1925 + TOMOYO_MAX_ACL_GROUPS) {
1926 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1927 - TOMOYO_MAX_GROUP;
1928 if (!tomoyo_read_domain2(head, &ns->acl_group
1929 [head->r.acl_group_index]))
1930 return;
1931 head->r.step++;
1932 }
1933 head->r.eof = true;
1934}
1935
1936/* Wait queue for kernel -> userspace notification. */
1937static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1938/* Wait queue for userspace -> kernel notification. */
1939static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1940
1941/* Structure for query. */
1942struct tomoyo_query {
1943 struct list_head list;
1944 struct tomoyo_domain_info *domain;
1945 char *query;
1946 size_t query_len;
1947 unsigned int serial;
1948 u8 timer;
1949 u8 answer;
1950 u8 retry;
1951};
1952
1953/* The list for "struct tomoyo_query". */
1954static LIST_HEAD(tomoyo_query_list);
1955
1956/* Lock for manipulating tomoyo_query_list. */
1957static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1958
1959/*
1960 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1961 * interface.
1962 */
1963static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1964
1965/**
1966 * tomoyo_truncate - Truncate a line.
1967 *
1968 * @str: String to truncate.
1969 *
1970 * Returns length of truncated @str.
1971 */
1972static int tomoyo_truncate(char *str)
1973{
1974 char *start = str;
1975
1976 while (*(unsigned char *) str > (unsigned char) ' ')
1977 str++;
1978 *str = '\0';
1979 return strlen(start) + 1;
1980}
1981
1982/**
1983 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1984 *
1985 * @domain: Pointer to "struct tomoyo_domain_info".
1986 * @header: Lines containing ACL.
1987 *
1988 * Returns nothing.
1989 */
1990static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1991{
1992 char *buffer;
1993 char *realpath = NULL;
1994 char *argv0 = NULL;
1995 char *symlink = NULL;
1996 char *cp = strchr(header, '\n');
1997 int len;
1998
1999 if (!cp)
2000 return;
2001 cp = strchr(cp + 1, '\n');
2002 if (!cp)
2003 return;
2004 *cp++ = '\0';
2005 len = strlen(cp) + 1;
2006 /* strstr() will return NULL if ordering is wrong. */
2007 if (*cp == 'f') {
2008 argv0 = strstr(header, " argv[]={ \"");
2009 if (argv0) {
2010 argv0 += 10;
2011 len += tomoyo_truncate(argv0) + 14;
2012 }
2013 realpath = strstr(header, " exec={ realpath=\"");
2014 if (realpath) {
2015 realpath += 8;
2016 len += tomoyo_truncate(realpath) + 6;
2017 }
2018 symlink = strstr(header, " symlink.target=\"");
2019 if (symlink)
2020 len += tomoyo_truncate(symlink + 1) + 1;
2021 }
2022 buffer = kmalloc(len, GFP_NOFS);
2023 if (!buffer)
2024 return;
2025 snprintf(buffer, len - 1, "%s", cp);
2026 if (realpath)
2027 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2028 if (argv0)
2029 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2030 if (symlink)
2031 tomoyo_addprintf(buffer, len, "%s", symlink);
2032 tomoyo_normalize_line(buffer);
2033 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2034 false))
2035 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2036 kfree(buffer);
2037}
2038
2039/**
2040 * tomoyo_supervisor - Ask for the supervisor's decision.
2041 *
2042 * @r: Pointer to "struct tomoyo_request_info".
2043 * @fmt: The printf()'s format string, followed by parameters.
2044 *
2045 * Returns 0 if the supervisor decided to permit the access request which
2046 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2047 * supervisor decided to retry the access request which violated the policy in
2048 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2049 */
2050int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2051{
2052 va_list args;
2053 int error;
2054 int len;
2055 static unsigned int tomoyo_serial;
2056 struct tomoyo_query entry = { };
2057 bool quota_exceeded = false;
2058
2059 va_start(args, fmt);
2060 len = vsnprintf(NULL, 0, fmt, args) + 1;
2061 va_end(args);
2062 /* Write /sys/kernel/security/tomoyo/audit. */
2063 va_start(args, fmt);
2064 tomoyo_write_log2(r, len, fmt, args);
2065 va_end(args);
2066 /* Nothing more to do if granted. */
2067 if (r->granted)
2068 return 0;
2069 if (r->mode)
2070 tomoyo_update_stat(r->mode);
2071 switch (r->mode) {
2072 case TOMOYO_CONFIG_ENFORCING:
2073 error = -EPERM;
2074 if (atomic_read(&tomoyo_query_observers))
2075 break;
2076 goto out;
2077 case TOMOYO_CONFIG_LEARNING:
2078 error = 0;
2079 /* Check max_learning_entry parameter. */
2080 if (tomoyo_domain_quota_is_ok(r))
2081 break;
2082 fallthrough;
2083 default:
2084 return 0;
2085 }
2086 /* Get message. */
2087 va_start(args, fmt);
2088 entry.query = tomoyo_init_log(r, len, fmt, args);
2089 va_end(args);
2090 if (!entry.query)
2091 goto out;
2092 entry.query_len = strlen(entry.query) + 1;
2093 if (!error) {
2094 tomoyo_add_entry(r->domain, entry.query);
2095 goto out;
2096 }
2097 len = tomoyo_round2(entry.query_len);
2098 entry.domain = r->domain;
2099 spin_lock(&tomoyo_query_list_lock);
2100 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2101 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2102 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2103 quota_exceeded = true;
2104 } else {
2105 entry.serial = tomoyo_serial++;
2106 entry.retry = r->retry;
2107 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2108 list_add_tail(&entry.list, &tomoyo_query_list);
2109 }
2110 spin_unlock(&tomoyo_query_list_lock);
2111 if (quota_exceeded)
2112 goto out;
2113 /* Give 10 seconds for supervisor's opinion. */
2114 while (entry.timer < 10) {
2115 wake_up_all(&tomoyo_query_wait);
2116 if (wait_event_interruptible_timeout
2117 (tomoyo_answer_wait, entry.answer ||
2118 !atomic_read(&tomoyo_query_observers), HZ))
2119 break;
2120 entry.timer++;
2121 }
2122 spin_lock(&tomoyo_query_list_lock);
2123 list_del(&entry.list);
2124 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2125 spin_unlock(&tomoyo_query_list_lock);
2126 switch (entry.answer) {
2127 case 3: /* Asked to retry by administrator. */
2128 error = TOMOYO_RETRY_REQUEST;
2129 r->retry++;
2130 break;
2131 case 1:
2132 /* Granted by administrator. */
2133 error = 0;
2134 break;
2135 default:
2136 /* Timed out or rejected by administrator. */
2137 break;
2138 }
2139out:
2140 kfree(entry.query);
2141 return error;
2142}
2143
2144/**
2145 * tomoyo_find_domain_by_qid - Get domain by query id.
2146 *
2147 * @serial: Query ID assigned by tomoyo_supervisor().
2148 *
2149 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2150 */
2151static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2152(unsigned int serial)
2153{
2154 struct tomoyo_query *ptr;
2155 struct tomoyo_domain_info *domain = NULL;
2156
2157 spin_lock(&tomoyo_query_list_lock);
2158 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2159 if (ptr->serial != serial)
2160 continue;
2161 domain = ptr->domain;
2162 break;
2163 }
2164 spin_unlock(&tomoyo_query_list_lock);
2165 return domain;
2166}
2167
2168/**
2169 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2170 *
2171 * @file: Pointer to "struct file".
2172 * @wait: Pointer to "poll_table".
2173 *
2174 * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2175 *
2176 * Waits for access requests which violated policy in enforcing mode.
2177 */
2178static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2179{
2180 if (!list_empty(&tomoyo_query_list))
2181 return EPOLLIN | EPOLLRDNORM;
2182 poll_wait(file, &tomoyo_query_wait, wait);
2183 if (!list_empty(&tomoyo_query_list))
2184 return EPOLLIN | EPOLLRDNORM;
2185 return 0;
2186}
2187
2188/**
2189 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2190 *
2191 * @head: Pointer to "struct tomoyo_io_buffer".
2192 */
2193static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2194{
2195 struct list_head *tmp;
2196 unsigned int pos = 0;
2197 size_t len = 0;
2198 char *buf;
2199
2200 if (head->r.w_pos)
2201 return;
2202 kfree(head->read_buf);
2203 head->read_buf = NULL;
2204 spin_lock(&tomoyo_query_list_lock);
2205 list_for_each(tmp, &tomoyo_query_list) {
2206 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2207
2208 if (pos++ != head->r.query_index)
2209 continue;
2210 len = ptr->query_len;
2211 break;
2212 }
2213 spin_unlock(&tomoyo_query_list_lock);
2214 if (!len) {
2215 head->r.query_index = 0;
2216 return;
2217 }
2218 buf = kzalloc(len + 32, GFP_NOFS);
2219 if (!buf)
2220 return;
2221 pos = 0;
2222 spin_lock(&tomoyo_query_list_lock);
2223 list_for_each(tmp, &tomoyo_query_list) {
2224 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2225
2226 if (pos++ != head->r.query_index)
2227 continue;
2228 /*
2229 * Some query can be skipped because tomoyo_query_list
2230 * can change, but I don't care.
2231 */
2232 if (len == ptr->query_len)
2233 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2234 ptr->retry, ptr->query);
2235 break;
2236 }
2237 spin_unlock(&tomoyo_query_list_lock);
2238 if (buf[0]) {
2239 head->read_buf = buf;
2240 head->r.w[head->r.w_pos++] = buf;
2241 head->r.query_index++;
2242 } else {
2243 kfree(buf);
2244 }
2245}
2246
2247/**
2248 * tomoyo_write_answer - Write the supervisor's decision.
2249 *
2250 * @head: Pointer to "struct tomoyo_io_buffer".
2251 *
2252 * Returns 0 on success, -EINVAL otherwise.
2253 */
2254static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2255{
2256 char *data = head->write_buf;
2257 struct list_head *tmp;
2258 unsigned int serial;
2259 unsigned int answer;
2260
2261 spin_lock(&tomoyo_query_list_lock);
2262 list_for_each(tmp, &tomoyo_query_list) {
2263 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2264
2265 ptr->timer = 0;
2266 }
2267 spin_unlock(&tomoyo_query_list_lock);
2268 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2269 return -EINVAL;
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 if (ptr->serial != serial)
2275 continue;
2276 ptr->answer = answer;
2277 /* Remove from tomoyo_query_list. */
2278 if (ptr->answer)
2279 list_del_init(&ptr->list);
2280 break;
2281 }
2282 spin_unlock(&tomoyo_query_list_lock);
2283 return 0;
2284}
2285
2286/**
2287 * tomoyo_read_version: Get version.
2288 *
2289 * @head: Pointer to "struct tomoyo_io_buffer".
2290 *
2291 * Returns version information.
2292 */
2293static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2294{
2295 if (!head->r.eof) {
2296 tomoyo_io_printf(head, "2.6.0");
2297 head->r.eof = true;
2298 }
2299}
2300
2301/* String table for /sys/kernel/security/tomoyo/stat interface. */
2302static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2303 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2304 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2305 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2306 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2307};
2308
2309/* String table for /sys/kernel/security/tomoyo/stat interface. */
2310static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2311 [TOMOYO_MEMORY_POLICY] = "policy:",
2312 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2313 [TOMOYO_MEMORY_QUERY] = "query message:",
2314};
2315
2316/* Counter for number of updates. */
2317static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2318/* Timestamp counter for last updated. */
2319static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2320
2321/**
2322 * tomoyo_update_stat - Update statistic counters.
2323 *
2324 * @index: Index for policy type.
2325 *
2326 * Returns nothing.
2327 */
2328void tomoyo_update_stat(const u8 index)
2329{
2330 atomic_inc(&tomoyo_stat_updated[index]);
2331 tomoyo_stat_modified[index] = ktime_get_real_seconds();
2332}
2333
2334/**
2335 * tomoyo_read_stat - Read statistic data.
2336 *
2337 * @head: Pointer to "struct tomoyo_io_buffer".
2338 *
2339 * Returns nothing.
2340 */
2341static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2342{
2343 u8 i;
2344 unsigned int total = 0;
2345
2346 if (head->r.eof)
2347 return;
2348 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2349 tomoyo_io_printf(head, "Policy %-30s %10u",
2350 tomoyo_policy_headers[i],
2351 atomic_read(&tomoyo_stat_updated[i]));
2352 if (tomoyo_stat_modified[i]) {
2353 struct tomoyo_time stamp;
2354
2355 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2356 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2357 stamp.year, stamp.month, stamp.day,
2358 stamp.hour, stamp.min, stamp.sec);
2359 }
2360 tomoyo_set_lf(head);
2361 }
2362 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2363 unsigned int used = tomoyo_memory_used[i];
2364
2365 total += used;
2366 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2367 tomoyo_memory_headers[i], used);
2368 used = tomoyo_memory_quota[i];
2369 if (used)
2370 tomoyo_io_printf(head, " (Quota: %10u)", used);
2371 tomoyo_set_lf(head);
2372 }
2373 tomoyo_io_printf(head, "Total memory used: %10u\n",
2374 total);
2375 head->r.eof = true;
2376}
2377
2378/**
2379 * tomoyo_write_stat - Set memory quota.
2380 *
2381 * @head: Pointer to "struct tomoyo_io_buffer".
2382 *
2383 * Returns 0.
2384 */
2385static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2386{
2387 char *data = head->write_buf;
2388 u8 i;
2389
2390 if (tomoyo_str_starts(&data, "Memory used by "))
2391 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2392 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2393 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2394 return 0;
2395}
2396
2397/**
2398 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2399 *
2400 * @type: Type of interface.
2401 * @file: Pointer to "struct file".
2402 *
2403 * Returns 0 on success, negative value otherwise.
2404 */
2405int tomoyo_open_control(const u8 type, struct file *file)
2406{
2407 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2408
2409 if (!head)
2410 return -ENOMEM;
2411 mutex_init(&head->io_sem);
2412 head->type = type;
2413 switch (type) {
2414 case TOMOYO_DOMAINPOLICY:
2415 /* /sys/kernel/security/tomoyo/domain_policy */
2416 head->write = tomoyo_write_domain;
2417 head->read = tomoyo_read_domain;
2418 break;
2419 case TOMOYO_EXCEPTIONPOLICY:
2420 /* /sys/kernel/security/tomoyo/exception_policy */
2421 head->write = tomoyo_write_exception;
2422 head->read = tomoyo_read_exception;
2423 break;
2424 case TOMOYO_AUDIT:
2425 /* /sys/kernel/security/tomoyo/audit */
2426 head->poll = tomoyo_poll_log;
2427 head->read = tomoyo_read_log;
2428 break;
2429 case TOMOYO_PROCESS_STATUS:
2430 /* /sys/kernel/security/tomoyo/.process_status */
2431 head->write = tomoyo_write_pid;
2432 head->read = tomoyo_read_pid;
2433 break;
2434 case TOMOYO_VERSION:
2435 /* /sys/kernel/security/tomoyo/version */
2436 head->read = tomoyo_read_version;
2437 head->readbuf_size = 128;
2438 break;
2439 case TOMOYO_STAT:
2440 /* /sys/kernel/security/tomoyo/stat */
2441 head->write = tomoyo_write_stat;
2442 head->read = tomoyo_read_stat;
2443 head->readbuf_size = 1024;
2444 break;
2445 case TOMOYO_PROFILE:
2446 /* /sys/kernel/security/tomoyo/profile */
2447 head->write = tomoyo_write_profile;
2448 head->read = tomoyo_read_profile;
2449 break;
2450 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2451 head->poll = tomoyo_poll_query;
2452 head->write = tomoyo_write_answer;
2453 head->read = tomoyo_read_query;
2454 break;
2455 case TOMOYO_MANAGER:
2456 /* /sys/kernel/security/tomoyo/manager */
2457 head->write = tomoyo_write_manager;
2458 head->read = tomoyo_read_manager;
2459 break;
2460 }
2461 if (!(file->f_mode & FMODE_READ)) {
2462 /*
2463 * No need to allocate read_buf since it is not opened
2464 * for reading.
2465 */
2466 head->read = NULL;
2467 head->poll = NULL;
2468 } else if (!head->poll) {
2469 /* Don't allocate read_buf for poll() access. */
2470 if (!head->readbuf_size)
2471 head->readbuf_size = 4096 * 2;
2472 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2473 if (!head->read_buf) {
2474 kfree(head);
2475 return -ENOMEM;
2476 }
2477 }
2478 if (!(file->f_mode & FMODE_WRITE)) {
2479 /*
2480 * No need to allocate write_buf since it is not opened
2481 * for writing.
2482 */
2483 head->write = NULL;
2484 } else if (head->write) {
2485 head->writebuf_size = 4096 * 2;
2486 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2487 if (!head->write_buf) {
2488 kfree(head->read_buf);
2489 kfree(head);
2490 return -ENOMEM;
2491 }
2492 }
2493 /*
2494 * If the file is /sys/kernel/security/tomoyo/query , increment the
2495 * observer counter.
2496 * The obserber counter is used by tomoyo_supervisor() to see if
2497 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2498 */
2499 if (type == TOMOYO_QUERY)
2500 atomic_inc(&tomoyo_query_observers);
2501 file->private_data = head;
2502 tomoyo_notify_gc(head, true);
2503 return 0;
2504}
2505
2506/**
2507 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2508 *
2509 * @file: Pointer to "struct file".
2510 * @wait: Pointer to "poll_table". Maybe NULL.
2511 *
2512 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2513 * EPOLLOUT | EPOLLWRNORM otherwise.
2514 */
2515__poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2516{
2517 struct tomoyo_io_buffer *head = file->private_data;
2518
2519 if (head->poll)
2520 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2521 return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2522}
2523
2524/**
2525 * tomoyo_set_namespace_cursor - Set namespace to read.
2526 *
2527 * @head: Pointer to "struct tomoyo_io_buffer".
2528 *
2529 * Returns nothing.
2530 */
2531static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2532{
2533 struct list_head *ns;
2534
2535 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2536 head->type != TOMOYO_PROFILE)
2537 return;
2538 /*
2539 * If this is the first read, or reading previous namespace finished
2540 * and has more namespaces to read, update the namespace cursor.
2541 */
2542 ns = head->r.ns;
2543 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2544 /* Clearing is OK because tomoyo_flush() returned true. */
2545 memset(&head->r, 0, sizeof(head->r));
2546 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2547 }
2548}
2549
2550/**
2551 * tomoyo_has_more_namespace - Check for unread namespaces.
2552 *
2553 * @head: Pointer to "struct tomoyo_io_buffer".
2554 *
2555 * Returns true if we have more entries to print, false otherwise.
2556 */
2557static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2558{
2559 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2560 head->type == TOMOYO_PROFILE) && head->r.eof &&
2561 head->r.ns->next != &tomoyo_namespace_list;
2562}
2563
2564/**
2565 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2566 *
2567 * @head: Pointer to "struct tomoyo_io_buffer".
2568 * @buffer: Pointer to buffer to write to.
2569 * @buffer_len: Size of @buffer.
2570 *
2571 * Returns bytes read on success, negative value otherwise.
2572 */
2573ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2574 const int buffer_len)
2575{
2576 int len;
2577 int idx;
2578
2579 if (!head->read)
2580 return -EINVAL;
2581 if (mutex_lock_interruptible(&head->io_sem))
2582 return -EINTR;
2583 head->read_user_buf = buffer;
2584 head->read_user_buf_avail = buffer_len;
2585 idx = tomoyo_read_lock();
2586 if (tomoyo_flush(head))
2587 /* Call the policy handler. */
2588 do {
2589 tomoyo_set_namespace_cursor(head);
2590 head->read(head);
2591 } while (tomoyo_flush(head) &&
2592 tomoyo_has_more_namespace(head));
2593 tomoyo_read_unlock(idx);
2594 len = head->read_user_buf - buffer;
2595 mutex_unlock(&head->io_sem);
2596 return len;
2597}
2598
2599/**
2600 * tomoyo_parse_policy - Parse a policy line.
2601 *
2602 * @head: Pointer to "struct tomoyo_io_buffer".
2603 * @line: Line to parse.
2604 *
2605 * Returns 0 on success, negative value otherwise.
2606 *
2607 * Caller holds tomoyo_read_lock().
2608 */
2609static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2610{
2611 /* Delete request? */
2612 head->w.is_delete = !strncmp(line, "delete ", 7);
2613 if (head->w.is_delete)
2614 memmove(line, line + 7, strlen(line + 7) + 1);
2615 /* Selecting namespace to update. */
2616 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2617 head->type == TOMOYO_PROFILE) {
2618 if (*line == '<') {
2619 char *cp = strchr(line, ' ');
2620
2621 if (cp) {
2622 *cp++ = '\0';
2623 head->w.ns = tomoyo_assign_namespace(line);
2624 memmove(line, cp, strlen(cp) + 1);
2625 } else
2626 head->w.ns = NULL;
2627 } else
2628 head->w.ns = &tomoyo_kernel_namespace;
2629 /* Don't allow updating if namespace is invalid. */
2630 if (!head->w.ns)
2631 return -ENOENT;
2632 }
2633 /* Do the update. */
2634 return head->write(head);
2635}
2636
2637/**
2638 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2639 *
2640 * @head: Pointer to "struct tomoyo_io_buffer".
2641 * @buffer: Pointer to buffer to read from.
2642 * @buffer_len: Size of @buffer.
2643 *
2644 * Returns @buffer_len on success, negative value otherwise.
2645 */
2646ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2647 const char __user *buffer, const int buffer_len)
2648{
2649 int error = buffer_len;
2650 size_t avail_len = buffer_len;
2651 char *cp0 = head->write_buf;
2652 int idx;
2653
2654 if (!head->write)
2655 return -EINVAL;
2656 if (mutex_lock_interruptible(&head->io_sem))
2657 return -EINTR;
2658 head->read_user_buf_avail = 0;
2659 idx = tomoyo_read_lock();
2660 /* Read a line and dispatch it to the policy handler. */
2661 while (avail_len > 0) {
2662 char c;
2663
2664 if (head->w.avail >= head->writebuf_size - 1) {
2665 const int len = head->writebuf_size * 2;
2666 char *cp = kzalloc(len, GFP_NOFS);
2667
2668 if (!cp) {
2669 error = -ENOMEM;
2670 break;
2671 }
2672 memmove(cp, cp0, head->w.avail);
2673 kfree(cp0);
2674 head->write_buf = cp;
2675 cp0 = cp;
2676 head->writebuf_size = len;
2677 }
2678 if (get_user(c, buffer)) {
2679 error = -EFAULT;
2680 break;
2681 }
2682 buffer++;
2683 avail_len--;
2684 cp0[head->w.avail++] = c;
2685 if (c != '\n')
2686 continue;
2687 cp0[head->w.avail - 1] = '\0';
2688 head->w.avail = 0;
2689 tomoyo_normalize_line(cp0);
2690 if (!strcmp(cp0, "reset")) {
2691 head->w.ns = &tomoyo_kernel_namespace;
2692 head->w.domain = NULL;
2693 memset(&head->r, 0, sizeof(head->r));
2694 continue;
2695 }
2696 /* Don't allow updating policies by non manager programs. */
2697 switch (head->type) {
2698 case TOMOYO_PROCESS_STATUS:
2699 /* This does not write anything. */
2700 break;
2701 case TOMOYO_DOMAINPOLICY:
2702 if (tomoyo_select_domain(head, cp0))
2703 continue;
2704 fallthrough;
2705 case TOMOYO_EXCEPTIONPOLICY:
2706 if (!strcmp(cp0, "select transition_only")) {
2707 head->r.print_transition_related_only = true;
2708 continue;
2709 }
2710 fallthrough;
2711 default:
2712 if (!tomoyo_manager()) {
2713 error = -EPERM;
2714 goto out;
2715 }
2716 }
2717 switch (tomoyo_parse_policy(head, cp0)) {
2718 case -EPERM:
2719 error = -EPERM;
2720 goto out;
2721 case 0:
2722 switch (head->type) {
2723 case TOMOYO_DOMAINPOLICY:
2724 case TOMOYO_EXCEPTIONPOLICY:
2725 case TOMOYO_STAT:
2726 case TOMOYO_PROFILE:
2727 case TOMOYO_MANAGER:
2728 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2729 break;
2730 default:
2731 break;
2732 }
2733 break;
2734 }
2735 }
2736out:
2737 tomoyo_read_unlock(idx);
2738 mutex_unlock(&head->io_sem);
2739 return error;
2740}
2741
2742/**
2743 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2744 *
2745 * @head: Pointer to "struct tomoyo_io_buffer".
2746 */
2747void tomoyo_close_control(struct tomoyo_io_buffer *head)
2748{
2749 /*
2750 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2751 * observer counter.
2752 */
2753 if (head->type == TOMOYO_QUERY &&
2754 atomic_dec_and_test(&tomoyo_query_observers))
2755 wake_up_all(&tomoyo_answer_wait);
2756 tomoyo_notify_gc(head, false);
2757}
2758
2759/**
2760 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2761 */
2762void tomoyo_check_profile(void)
2763{
2764 struct tomoyo_domain_info *domain;
2765 const int idx = tomoyo_read_lock();
2766
2767 tomoyo_policy_loaded = true;
2768 pr_info("TOMOYO: 2.6.0\n");
2769 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2770 srcu_read_lock_held(&tomoyo_ss)) {
2771 const u8 profile = domain->profile;
2772 struct tomoyo_policy_namespace *ns = domain->ns;
2773
2774 if (ns->profile_version == 20110903) {
2775 pr_info_once("Converting profile version from %u to %u.\n",
2776 20110903, 20150505);
2777 ns->profile_version = 20150505;
2778 }
2779 if (ns->profile_version != 20150505)
2780 pr_err("Profile version %u is not supported.\n",
2781 ns->profile_version);
2782 else if (!ns->profile_ptr[profile])
2783 pr_err("Profile %u (used by '%s') is not defined.\n",
2784 profile, domain->domainname->name);
2785 else
2786 continue;
2787 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2788 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2789 panic("STOP!");
2790 }
2791 tomoyo_read_unlock(idx);
2792 pr_info("Mandatory Access Control activated.\n");
2793}
2794
2795/**
2796 * tomoyo_load_builtin_policy - Load built-in policy.
2797 *
2798 * Returns nothing.
2799 */
2800void __init tomoyo_load_builtin_policy(void)
2801{
2802#ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2803 static char tomoyo_builtin_profile[] __initdata =
2804 "PROFILE_VERSION=20150505\n"
2805 "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2806 static char tomoyo_builtin_exception_policy[] __initdata =
2807 "aggregator proc:/self/exe /proc/self/exe\n";
2808 static char tomoyo_builtin_domain_policy[] __initdata = "";
2809 static char tomoyo_builtin_manager[] __initdata = "";
2810 static char tomoyo_builtin_stat[] __initdata = "";
2811#else
2812 /*
2813 * This include file is manually created and contains built-in policy
2814 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2815 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2816 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2817 */
2818#include "builtin-policy.h"
2819#endif
2820 u8 i;
2821 const int idx = tomoyo_read_lock();
2822
2823 for (i = 0; i < 5; i++) {
2824 struct tomoyo_io_buffer head = { };
2825 char *start = "";
2826
2827 switch (i) {
2828 case 0:
2829 start = tomoyo_builtin_profile;
2830 head.type = TOMOYO_PROFILE;
2831 head.write = tomoyo_write_profile;
2832 break;
2833 case 1:
2834 start = tomoyo_builtin_exception_policy;
2835 head.type = TOMOYO_EXCEPTIONPOLICY;
2836 head.write = tomoyo_write_exception;
2837 break;
2838 case 2:
2839 start = tomoyo_builtin_domain_policy;
2840 head.type = TOMOYO_DOMAINPOLICY;
2841 head.write = tomoyo_write_domain;
2842 break;
2843 case 3:
2844 start = tomoyo_builtin_manager;
2845 head.type = TOMOYO_MANAGER;
2846 head.write = tomoyo_write_manager;
2847 break;
2848 case 4:
2849 start = tomoyo_builtin_stat;
2850 head.type = TOMOYO_STAT;
2851 head.write = tomoyo_write_stat;
2852 break;
2853 }
2854 while (1) {
2855 char *end = strchr(start, '\n');
2856
2857 if (!end)
2858 break;
2859 *end = '\0';
2860 tomoyo_normalize_line(start);
2861 head.write_buf = start;
2862 tomoyo_parse_policy(&head, start);
2863 start = end + 1;
2864 }
2865 }
2866 tomoyo_read_unlock(idx);
2867#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2868 tomoyo_check_profile();
2869#endif
2870}
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 if (!ptr->head.is_deleted &&
956 (!tomoyo_pathcmp(domainname, ptr->manager) ||
957 !strcmp(exe, ptr->manager->name))) {
958 found = true;
959 break;
960 }
961 }
962 if (!found) { /* Reduce error messages. */
963 static pid_t last_pid;
964 const pid_t pid = current->pid;
965
966 if (last_pid != pid) {
967 pr_warn("%s ( %s ) is not permitted to update policies.\n",
968 domainname->name, exe);
969 last_pid = pid;
970 }
971 }
972 kfree(exe);
973 return found;
974}
975
976static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
977(unsigned int serial);
978
979/**
980 * tomoyo_select_domain - Parse select command.
981 *
982 * @head: Pointer to "struct tomoyo_io_buffer".
983 * @data: String to parse.
984 *
985 * Returns true on success, false otherwise.
986 *
987 * Caller holds tomoyo_read_lock().
988 */
989static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
990 const char *data)
991{
992 unsigned int pid;
993 struct tomoyo_domain_info *domain = NULL;
994 bool global_pid = false;
995
996 if (strncmp(data, "select ", 7))
997 return false;
998 data += 7;
999 if (sscanf(data, "pid=%u", &pid) == 1 ||
1000 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
1001 struct task_struct *p;
1002
1003 rcu_read_lock();
1004 if (global_pid)
1005 p = find_task_by_pid_ns(pid, &init_pid_ns);
1006 else
1007 p = find_task_by_vpid(pid);
1008 if (p)
1009 domain = tomoyo_task(p)->domain_info;
1010 rcu_read_unlock();
1011 } else if (!strncmp(data, "domain=", 7)) {
1012 if (tomoyo_domain_def(data + 7))
1013 domain = tomoyo_find_domain(data + 7);
1014 } else if (sscanf(data, "Q=%u", &pid) == 1) {
1015 domain = tomoyo_find_domain_by_qid(pid);
1016 } else
1017 return false;
1018 head->w.domain = domain;
1019 /* Accessing read_buf is safe because head->io_sem is held. */
1020 if (!head->read_buf)
1021 return true; /* Do nothing if open(O_WRONLY). */
1022 memset(&head->r, 0, sizeof(head->r));
1023 head->r.print_this_domain_only = true;
1024 if (domain)
1025 head->r.domain = &domain->list;
1026 else
1027 head->r.eof = 1;
1028 tomoyo_io_printf(head, "# select %s\n", data);
1029 if (domain && domain->is_deleted)
1030 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1031 return true;
1032}
1033
1034/**
1035 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1036 *
1037 * @a: Pointer to "struct tomoyo_acl_info".
1038 * @b: Pointer to "struct tomoyo_acl_info".
1039 *
1040 * Returns true if @a == @b, false otherwise.
1041 */
1042static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1043 const struct tomoyo_acl_info *b)
1044{
1045 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1046 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1047
1048 return p1->domainname == p2->domainname;
1049}
1050
1051/**
1052 * tomoyo_write_task - Update task related list.
1053 *
1054 * @param: Pointer to "struct tomoyo_acl_param".
1055 *
1056 * Returns 0 on success, negative value otherwise.
1057 *
1058 * Caller holds tomoyo_read_lock().
1059 */
1060static int tomoyo_write_task(struct tomoyo_acl_param *param)
1061{
1062 int error = -EINVAL;
1063
1064 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
1065 struct tomoyo_task_acl e = {
1066 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1067 .domainname = tomoyo_get_domainname(param),
1068 };
1069
1070 if (e.domainname)
1071 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1072 tomoyo_same_task_acl,
1073 NULL);
1074 tomoyo_put_name(e.domainname);
1075 }
1076 return error;
1077}
1078
1079/**
1080 * tomoyo_delete_domain - Delete a domain.
1081 *
1082 * @domainname: The name of domain.
1083 *
1084 * Returns 0 on success, negative value otherwise.
1085 *
1086 * Caller holds tomoyo_read_lock().
1087 */
1088static int tomoyo_delete_domain(char *domainname)
1089{
1090 struct tomoyo_domain_info *domain;
1091 struct tomoyo_path_info name;
1092
1093 name.name = domainname;
1094 tomoyo_fill_path_info(&name);
1095 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1096 return -EINTR;
1097 /* Is there an active domain? */
1098 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1099 /* Never delete tomoyo_kernel_domain */
1100 if (domain == &tomoyo_kernel_domain)
1101 continue;
1102 if (domain->is_deleted ||
1103 tomoyo_pathcmp(domain->domainname, &name))
1104 continue;
1105 domain->is_deleted = true;
1106 break;
1107 }
1108 mutex_unlock(&tomoyo_policy_lock);
1109 return 0;
1110}
1111
1112/**
1113 * tomoyo_write_domain2 - Write domain policy.
1114 *
1115 * @ns: Pointer to "struct tomoyo_policy_namespace".
1116 * @list: Pointer to "struct list_head".
1117 * @data: Policy to be interpreted.
1118 * @is_delete: True if it is a delete request.
1119 *
1120 * Returns 0 on success, negative value otherwise.
1121 *
1122 * Caller holds tomoyo_read_lock().
1123 */
1124static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1125 struct list_head *list, char *data,
1126 const bool is_delete)
1127{
1128 struct tomoyo_acl_param param = {
1129 .ns = ns,
1130 .list = list,
1131 .data = data,
1132 .is_delete = is_delete,
1133 };
1134 static const struct {
1135 const char *keyword;
1136 int (*write)(struct tomoyo_acl_param *param);
1137 } tomoyo_callback[5] = {
1138 { "file ", tomoyo_write_file },
1139 { "network inet ", tomoyo_write_inet_network },
1140 { "network unix ", tomoyo_write_unix_network },
1141 { "misc ", tomoyo_write_misc },
1142 { "task ", tomoyo_write_task },
1143 };
1144 u8 i;
1145
1146 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1147 if (!tomoyo_str_starts(¶m.data,
1148 tomoyo_callback[i].keyword))
1149 continue;
1150 return tomoyo_callback[i].write(¶m);
1151 }
1152 return -EINVAL;
1153}
1154
1155/* String table for domain flags. */
1156const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1157 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1158 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1159};
1160
1161/**
1162 * tomoyo_write_domain - Write domain policy.
1163 *
1164 * @head: Pointer to "struct tomoyo_io_buffer".
1165 *
1166 * Returns 0 on success, negative value otherwise.
1167 *
1168 * Caller holds tomoyo_read_lock().
1169 */
1170static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1171{
1172 char *data = head->write_buf;
1173 struct tomoyo_policy_namespace *ns;
1174 struct tomoyo_domain_info *domain = head->w.domain;
1175 const bool is_delete = head->w.is_delete;
1176 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1177 unsigned int idx;
1178
1179 if (*data == '<') {
1180 int ret = 0;
1181
1182 domain = NULL;
1183 if (is_delete)
1184 ret = tomoyo_delete_domain(data);
1185 else if (is_select)
1186 domain = tomoyo_find_domain(data);
1187 else
1188 domain = tomoyo_assign_domain(data, false);
1189 head->w.domain = domain;
1190 return ret;
1191 }
1192 if (!domain)
1193 return -EINVAL;
1194 ns = domain->ns;
1195 if (sscanf(data, "use_profile %u", &idx) == 1
1196 && idx < TOMOYO_MAX_PROFILES) {
1197 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1198 if (!is_delete)
1199 domain->profile = (u8) idx;
1200 return 0;
1201 }
1202 if (sscanf(data, "use_group %u\n", &idx) == 1
1203 && idx < TOMOYO_MAX_ACL_GROUPS) {
1204 if (!is_delete)
1205 set_bit(idx, domain->group);
1206 else
1207 clear_bit(idx, domain->group);
1208 return 0;
1209 }
1210 for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1211 const char *cp = tomoyo_dif[idx];
1212
1213 if (strncmp(data, cp, strlen(cp) - 1))
1214 continue;
1215 domain->flags[idx] = !is_delete;
1216 return 0;
1217 }
1218 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1219 is_delete);
1220}
1221
1222/**
1223 * tomoyo_print_condition - Print condition part.
1224 *
1225 * @head: Pointer to "struct tomoyo_io_buffer".
1226 * @cond: Pointer to "struct tomoyo_condition".
1227 *
1228 * Returns true on success, false otherwise.
1229 */
1230static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1231 const struct tomoyo_condition *cond)
1232{
1233 switch (head->r.cond_step) {
1234 case 0:
1235 head->r.cond_index = 0;
1236 head->r.cond_step++;
1237 if (cond->transit) {
1238 tomoyo_set_space(head);
1239 tomoyo_set_string(head, cond->transit->name);
1240 }
1241 /* fall through */
1242 case 1:
1243 {
1244 const u16 condc = cond->condc;
1245 const struct tomoyo_condition_element *condp =
1246 (typeof(condp)) (cond + 1);
1247 const struct tomoyo_number_union *numbers_p =
1248 (typeof(numbers_p)) (condp + condc);
1249 const struct tomoyo_name_union *names_p =
1250 (typeof(names_p))
1251 (numbers_p + cond->numbers_count);
1252 const struct tomoyo_argv *argv =
1253 (typeof(argv)) (names_p + cond->names_count);
1254 const struct tomoyo_envp *envp =
1255 (typeof(envp)) (argv + cond->argc);
1256 u16 skip;
1257
1258 for (skip = 0; skip < head->r.cond_index; skip++) {
1259 const u8 left = condp->left;
1260 const u8 right = condp->right;
1261
1262 condp++;
1263 switch (left) {
1264 case TOMOYO_ARGV_ENTRY:
1265 argv++;
1266 continue;
1267 case TOMOYO_ENVP_ENTRY:
1268 envp++;
1269 continue;
1270 case TOMOYO_NUMBER_UNION:
1271 numbers_p++;
1272 break;
1273 }
1274 switch (right) {
1275 case TOMOYO_NAME_UNION:
1276 names_p++;
1277 break;
1278 case TOMOYO_NUMBER_UNION:
1279 numbers_p++;
1280 break;
1281 }
1282 }
1283 while (head->r.cond_index < condc) {
1284 const u8 match = condp->equals;
1285 const u8 left = condp->left;
1286 const u8 right = condp->right;
1287
1288 if (!tomoyo_flush(head))
1289 return false;
1290 condp++;
1291 head->r.cond_index++;
1292 tomoyo_set_space(head);
1293 switch (left) {
1294 case TOMOYO_ARGV_ENTRY:
1295 tomoyo_io_printf(head,
1296 "exec.argv[%lu]%s=\"",
1297 argv->index, argv->is_not ? "!" : "");
1298 tomoyo_set_string(head,
1299 argv->value->name);
1300 tomoyo_set_string(head, "\"");
1301 argv++;
1302 continue;
1303 case TOMOYO_ENVP_ENTRY:
1304 tomoyo_set_string(head,
1305 "exec.envp[\"");
1306 tomoyo_set_string(head,
1307 envp->name->name);
1308 tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1309 if (envp->value) {
1310 tomoyo_set_string(head, "\"");
1311 tomoyo_set_string(head, envp->value->name);
1312 tomoyo_set_string(head, "\"");
1313 } else {
1314 tomoyo_set_string(head,
1315 "NULL");
1316 }
1317 envp++;
1318 continue;
1319 case TOMOYO_NUMBER_UNION:
1320 tomoyo_print_number_union_nospace
1321 (head, numbers_p++);
1322 break;
1323 default:
1324 tomoyo_set_string(head,
1325 tomoyo_condition_keyword[left]);
1326 break;
1327 }
1328 tomoyo_set_string(head, match ? "=" : "!=");
1329 switch (right) {
1330 case TOMOYO_NAME_UNION:
1331 tomoyo_print_name_union_quoted
1332 (head, names_p++);
1333 break;
1334 case TOMOYO_NUMBER_UNION:
1335 tomoyo_print_number_union_nospace
1336 (head, numbers_p++);
1337 break;
1338 default:
1339 tomoyo_set_string(head,
1340 tomoyo_condition_keyword[right]);
1341 break;
1342 }
1343 }
1344 }
1345 head->r.cond_step++;
1346 /* fall through */
1347 case 2:
1348 if (!tomoyo_flush(head))
1349 break;
1350 head->r.cond_step++;
1351 /* fall through */
1352 case 3:
1353 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1354 tomoyo_io_printf(head, " grant_log=%s",
1355 tomoyo_yesno(cond->grant_log ==
1356 TOMOYO_GRANTLOG_YES));
1357 tomoyo_set_lf(head);
1358 return true;
1359 }
1360 return false;
1361}
1362
1363/**
1364 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1365 *
1366 * @head: Pointer to "struct tomoyo_io_buffer".
1367 * @category: Category name.
1368 *
1369 * Returns nothing.
1370 */
1371static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1372 const char *category)
1373{
1374 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1375 tomoyo_print_namespace(head);
1376 tomoyo_io_printf(head, "acl_group %u ",
1377 head->r.acl_group_index);
1378 }
1379 tomoyo_set_string(head, category);
1380}
1381
1382/**
1383 * tomoyo_print_entry - Print an ACL entry.
1384 *
1385 * @head: Pointer to "struct tomoyo_io_buffer".
1386 * @acl: Pointer to an ACL entry.
1387 *
1388 * Returns true on success, false otherwise.
1389 */
1390static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1391 struct tomoyo_acl_info *acl)
1392{
1393 const u8 acl_type = acl->type;
1394 bool first = true;
1395 u8 bit;
1396
1397 if (head->r.print_cond_part)
1398 goto print_cond_part;
1399 if (acl->is_deleted)
1400 return true;
1401 if (!tomoyo_flush(head))
1402 return false;
1403 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1404 struct tomoyo_path_acl *ptr =
1405 container_of(acl, typeof(*ptr), head);
1406 const u16 perm = ptr->perm;
1407
1408 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1409 if (!(perm & (1 << bit)))
1410 continue;
1411 if (head->r.print_transition_related_only &&
1412 bit != TOMOYO_TYPE_EXECUTE)
1413 continue;
1414 if (first) {
1415 tomoyo_set_group(head, "file ");
1416 first = false;
1417 } else {
1418 tomoyo_set_slash(head);
1419 }
1420 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1421 }
1422 if (first)
1423 return true;
1424 tomoyo_print_name_union(head, &ptr->name);
1425 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1426 struct tomoyo_task_acl *ptr =
1427 container_of(acl, typeof(*ptr), head);
1428
1429 tomoyo_set_group(head, "task ");
1430 tomoyo_set_string(head, "manual_domain_transition ");
1431 tomoyo_set_string(head, ptr->domainname->name);
1432 } else if (head->r.print_transition_related_only) {
1433 return true;
1434 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1435 struct tomoyo_path2_acl *ptr =
1436 container_of(acl, typeof(*ptr), head);
1437 const u8 perm = ptr->perm;
1438
1439 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1440 if (!(perm & (1 << bit)))
1441 continue;
1442 if (first) {
1443 tomoyo_set_group(head, "file ");
1444 first = false;
1445 } else {
1446 tomoyo_set_slash(head);
1447 }
1448 tomoyo_set_string(head, tomoyo_mac_keywords
1449 [tomoyo_pp2mac[bit]]);
1450 }
1451 if (first)
1452 return true;
1453 tomoyo_print_name_union(head, &ptr->name1);
1454 tomoyo_print_name_union(head, &ptr->name2);
1455 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1456 struct tomoyo_path_number_acl *ptr =
1457 container_of(acl, typeof(*ptr), head);
1458 const u8 perm = ptr->perm;
1459
1460 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1461 if (!(perm & (1 << bit)))
1462 continue;
1463 if (first) {
1464 tomoyo_set_group(head, "file ");
1465 first = false;
1466 } else {
1467 tomoyo_set_slash(head);
1468 }
1469 tomoyo_set_string(head, tomoyo_mac_keywords
1470 [tomoyo_pn2mac[bit]]);
1471 }
1472 if (first)
1473 return true;
1474 tomoyo_print_name_union(head, &ptr->name);
1475 tomoyo_print_number_union(head, &ptr->number);
1476 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1477 struct tomoyo_mkdev_acl *ptr =
1478 container_of(acl, typeof(*ptr), head);
1479 const u8 perm = ptr->perm;
1480
1481 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1482 if (!(perm & (1 << bit)))
1483 continue;
1484 if (first) {
1485 tomoyo_set_group(head, "file ");
1486 first = false;
1487 } else {
1488 tomoyo_set_slash(head);
1489 }
1490 tomoyo_set_string(head, tomoyo_mac_keywords
1491 [tomoyo_pnnn2mac[bit]]);
1492 }
1493 if (first)
1494 return true;
1495 tomoyo_print_name_union(head, &ptr->name);
1496 tomoyo_print_number_union(head, &ptr->mode);
1497 tomoyo_print_number_union(head, &ptr->major);
1498 tomoyo_print_number_union(head, &ptr->minor);
1499 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1500 struct tomoyo_inet_acl *ptr =
1501 container_of(acl, typeof(*ptr), head);
1502 const u8 perm = ptr->perm;
1503
1504 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1505 if (!(perm & (1 << bit)))
1506 continue;
1507 if (first) {
1508 tomoyo_set_group(head, "network inet ");
1509 tomoyo_set_string(head, tomoyo_proto_keyword
1510 [ptr->protocol]);
1511 tomoyo_set_space(head);
1512 first = false;
1513 } else {
1514 tomoyo_set_slash(head);
1515 }
1516 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1517 }
1518 if (first)
1519 return true;
1520 tomoyo_set_space(head);
1521 if (ptr->address.group) {
1522 tomoyo_set_string(head, "@");
1523 tomoyo_set_string(head, ptr->address.group->group_name
1524 ->name);
1525 } else {
1526 char buf[128];
1527
1528 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1529 tomoyo_io_printf(head, "%s", buf);
1530 }
1531 tomoyo_print_number_union(head, &ptr->port);
1532 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1533 struct tomoyo_unix_acl *ptr =
1534 container_of(acl, typeof(*ptr), head);
1535 const u8 perm = ptr->perm;
1536
1537 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1538 if (!(perm & (1 << bit)))
1539 continue;
1540 if (first) {
1541 tomoyo_set_group(head, "network unix ");
1542 tomoyo_set_string(head, tomoyo_proto_keyword
1543 [ptr->protocol]);
1544 tomoyo_set_space(head);
1545 first = false;
1546 } else {
1547 tomoyo_set_slash(head);
1548 }
1549 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1550 }
1551 if (first)
1552 return true;
1553 tomoyo_print_name_union(head, &ptr->name);
1554 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1555 struct tomoyo_mount_acl *ptr =
1556 container_of(acl, typeof(*ptr), head);
1557
1558 tomoyo_set_group(head, "file mount");
1559 tomoyo_print_name_union(head, &ptr->dev_name);
1560 tomoyo_print_name_union(head, &ptr->dir_name);
1561 tomoyo_print_name_union(head, &ptr->fs_type);
1562 tomoyo_print_number_union(head, &ptr->flags);
1563 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1564 struct tomoyo_env_acl *ptr =
1565 container_of(acl, typeof(*ptr), head);
1566
1567 tomoyo_set_group(head, "misc env ");
1568 tomoyo_set_string(head, ptr->env->name);
1569 }
1570 if (acl->cond) {
1571 head->r.print_cond_part = true;
1572 head->r.cond_step = 0;
1573 if (!tomoyo_flush(head))
1574 return false;
1575print_cond_part:
1576 if (!tomoyo_print_condition(head, acl->cond))
1577 return false;
1578 head->r.print_cond_part = false;
1579 } else {
1580 tomoyo_set_lf(head);
1581 }
1582 return true;
1583}
1584
1585/**
1586 * tomoyo_read_domain2 - Read domain policy.
1587 *
1588 * @head: Pointer to "struct tomoyo_io_buffer".
1589 * @list: Pointer to "struct list_head".
1590 *
1591 * Caller holds tomoyo_read_lock().
1592 *
1593 * Returns true on success, false otherwise.
1594 */
1595static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1596 struct list_head *list)
1597{
1598 list_for_each_cookie(head->r.acl, list) {
1599 struct tomoyo_acl_info *ptr =
1600 list_entry(head->r.acl, typeof(*ptr), list);
1601
1602 if (!tomoyo_print_entry(head, ptr))
1603 return false;
1604 }
1605 head->r.acl = NULL;
1606 return true;
1607}
1608
1609/**
1610 * tomoyo_read_domain - Read domain policy.
1611 *
1612 * @head: Pointer to "struct tomoyo_io_buffer".
1613 *
1614 * Caller holds tomoyo_read_lock().
1615 */
1616static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1617{
1618 if (head->r.eof)
1619 return;
1620 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1621 struct tomoyo_domain_info *domain =
1622 list_entry(head->r.domain, typeof(*domain), list);
1623 u8 i;
1624
1625 switch (head->r.step) {
1626 case 0:
1627 if (domain->is_deleted &&
1628 !head->r.print_this_domain_only)
1629 continue;
1630 /* Print domainname and flags. */
1631 tomoyo_set_string(head, domain->domainname->name);
1632 tomoyo_set_lf(head);
1633 tomoyo_io_printf(head, "use_profile %u\n",
1634 domain->profile);
1635 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1636 if (domain->flags[i])
1637 tomoyo_set_string(head, tomoyo_dif[i]);
1638 head->r.index = 0;
1639 head->r.step++;
1640 /* fall through */
1641 case 1:
1642 while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1643 i = head->r.index++;
1644 if (!test_bit(i, domain->group))
1645 continue;
1646 tomoyo_io_printf(head, "use_group %u\n", i);
1647 if (!tomoyo_flush(head))
1648 return;
1649 }
1650 head->r.index = 0;
1651 head->r.step++;
1652 tomoyo_set_lf(head);
1653 /* fall through */
1654 case 2:
1655 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1656 return;
1657 head->r.step++;
1658 if (!tomoyo_set_lf(head))
1659 return;
1660 /* fall through */
1661 case 3:
1662 head->r.step = 0;
1663 if (head->r.print_this_domain_only)
1664 goto done;
1665 }
1666 }
1667 done:
1668 head->r.eof = true;
1669}
1670
1671/**
1672 * tomoyo_write_pid: Specify PID to obtain domainname.
1673 *
1674 * @head: Pointer to "struct tomoyo_io_buffer".
1675 *
1676 * Returns 0.
1677 */
1678static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1679{
1680 head->r.eof = false;
1681 return 0;
1682}
1683
1684/**
1685 * tomoyo_read_pid - Get domainname of the specified PID.
1686 *
1687 * @head: Pointer to "struct tomoyo_io_buffer".
1688 *
1689 * Returns the domainname which the specified PID is in on success,
1690 * empty string otherwise.
1691 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1692 * using read()/write() interface rather than sysctl() interface.
1693 */
1694static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1695{
1696 char *buf = head->write_buf;
1697 bool global_pid = false;
1698 unsigned int pid;
1699 struct task_struct *p;
1700 struct tomoyo_domain_info *domain = NULL;
1701
1702 /* Accessing write_buf is safe because head->io_sem is held. */
1703 if (!buf) {
1704 head->r.eof = true;
1705 return; /* Do nothing if open(O_RDONLY). */
1706 }
1707 if (head->r.w_pos || head->r.eof)
1708 return;
1709 head->r.eof = true;
1710 if (tomoyo_str_starts(&buf, "global-pid "))
1711 global_pid = true;
1712 if (kstrtouint(buf, 10, &pid))
1713 return;
1714 rcu_read_lock();
1715 if (global_pid)
1716 p = find_task_by_pid_ns(pid, &init_pid_ns);
1717 else
1718 p = find_task_by_vpid(pid);
1719 if (p)
1720 domain = tomoyo_task(p)->domain_info;
1721 rcu_read_unlock();
1722 if (!domain)
1723 return;
1724 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1725 tomoyo_set_string(head, domain->domainname->name);
1726}
1727
1728/* String table for domain transition control keywords. */
1729static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1730 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1731 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1732 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1733 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1734 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1735 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1736};
1737
1738/* String table for grouping keywords. */
1739static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1740 [TOMOYO_PATH_GROUP] = "path_group ",
1741 [TOMOYO_NUMBER_GROUP] = "number_group ",
1742 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1743};
1744
1745/**
1746 * tomoyo_write_exception - Write exception policy.
1747 *
1748 * @head: Pointer to "struct tomoyo_io_buffer".
1749 *
1750 * Returns 0 on success, negative value otherwise.
1751 *
1752 * Caller holds tomoyo_read_lock().
1753 */
1754static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1755{
1756 const bool is_delete = head->w.is_delete;
1757 struct tomoyo_acl_param param = {
1758 .ns = head->w.ns,
1759 .is_delete = is_delete,
1760 .data = head->write_buf,
1761 };
1762 u8 i;
1763
1764 if (tomoyo_str_starts(¶m.data, "aggregator "))
1765 return tomoyo_write_aggregator(¶m);
1766 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1767 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i]))
1768 return tomoyo_write_transition_control(¶m, i);
1769 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1770 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i]))
1771 return tomoyo_write_group(¶m, i);
1772 if (tomoyo_str_starts(¶m.data, "acl_group ")) {
1773 unsigned int group;
1774 char *data;
1775
1776 group = simple_strtoul(param.data, &data, 10);
1777 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1778 return tomoyo_write_domain2
1779 (head->w.ns, &head->w.ns->acl_group[group],
1780 data, is_delete);
1781 }
1782 return -EINVAL;
1783}
1784
1785/**
1786 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1787 *
1788 * @head: Pointer to "struct tomoyo_io_buffer".
1789 * @idx: Index number.
1790 *
1791 * Returns true on success, false otherwise.
1792 *
1793 * Caller holds tomoyo_read_lock().
1794 */
1795static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1796{
1797 struct tomoyo_policy_namespace *ns =
1798 container_of(head->r.ns, typeof(*ns), namespace_list);
1799 struct list_head *list = &ns->group_list[idx];
1800
1801 list_for_each_cookie(head->r.group, list) {
1802 struct tomoyo_group *group =
1803 list_entry(head->r.group, typeof(*group), head.list);
1804
1805 list_for_each_cookie(head->r.acl, &group->member_list) {
1806 struct tomoyo_acl_head *ptr =
1807 list_entry(head->r.acl, typeof(*ptr), list);
1808
1809 if (ptr->is_deleted)
1810 continue;
1811 if (!tomoyo_flush(head))
1812 return false;
1813 tomoyo_print_namespace(head);
1814 tomoyo_set_string(head, tomoyo_group_name[idx]);
1815 tomoyo_set_string(head, group->group_name->name);
1816 if (idx == TOMOYO_PATH_GROUP) {
1817 tomoyo_set_space(head);
1818 tomoyo_set_string(head, container_of
1819 (ptr, struct tomoyo_path_group,
1820 head)->member_name->name);
1821 } else if (idx == TOMOYO_NUMBER_GROUP) {
1822 tomoyo_print_number_union(head, &container_of
1823 (ptr,
1824 struct tomoyo_number_group,
1825 head)->number);
1826 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1827 char buffer[128];
1828 struct tomoyo_address_group *member =
1829 container_of(ptr, typeof(*member),
1830 head);
1831
1832 tomoyo_print_ip(buffer, sizeof(buffer),
1833 &member->address);
1834 tomoyo_io_printf(head, " %s", buffer);
1835 }
1836 tomoyo_set_lf(head);
1837 }
1838 head->r.acl = NULL;
1839 }
1840 head->r.group = NULL;
1841 return true;
1842}
1843
1844/**
1845 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1846 *
1847 * @head: Pointer to "struct tomoyo_io_buffer".
1848 * @idx: Index number.
1849 *
1850 * Returns true on success, false otherwise.
1851 *
1852 * Caller holds tomoyo_read_lock().
1853 */
1854static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1855{
1856 struct tomoyo_policy_namespace *ns =
1857 container_of(head->r.ns, typeof(*ns), namespace_list);
1858 struct list_head *list = &ns->policy_list[idx];
1859
1860 list_for_each_cookie(head->r.acl, list) {
1861 struct tomoyo_acl_head *acl =
1862 container_of(head->r.acl, typeof(*acl), list);
1863 if (acl->is_deleted)
1864 continue;
1865 if (!tomoyo_flush(head))
1866 return false;
1867 switch (idx) {
1868 case TOMOYO_ID_TRANSITION_CONTROL:
1869 {
1870 struct tomoyo_transition_control *ptr =
1871 container_of(acl, typeof(*ptr), head);
1872
1873 tomoyo_print_namespace(head);
1874 tomoyo_set_string(head, tomoyo_transition_type
1875 [ptr->type]);
1876 tomoyo_set_string(head, ptr->program ?
1877 ptr->program->name : "any");
1878 tomoyo_set_string(head, " from ");
1879 tomoyo_set_string(head, ptr->domainname ?
1880 ptr->domainname->name :
1881 "any");
1882 }
1883 break;
1884 case TOMOYO_ID_AGGREGATOR:
1885 {
1886 struct tomoyo_aggregator *ptr =
1887 container_of(acl, typeof(*ptr), head);
1888
1889 tomoyo_print_namespace(head);
1890 tomoyo_set_string(head, "aggregator ");
1891 tomoyo_set_string(head,
1892 ptr->original_name->name);
1893 tomoyo_set_space(head);
1894 tomoyo_set_string(head,
1895 ptr->aggregated_name->name);
1896 }
1897 break;
1898 default:
1899 continue;
1900 }
1901 tomoyo_set_lf(head);
1902 }
1903 head->r.acl = NULL;
1904 return true;
1905}
1906
1907/**
1908 * tomoyo_read_exception - Read exception policy.
1909 *
1910 * @head: Pointer to "struct tomoyo_io_buffer".
1911 *
1912 * Caller holds tomoyo_read_lock().
1913 */
1914static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1915{
1916 struct tomoyo_policy_namespace *ns =
1917 container_of(head->r.ns, typeof(*ns), namespace_list);
1918
1919 if (head->r.eof)
1920 return;
1921 while (head->r.step < TOMOYO_MAX_POLICY &&
1922 tomoyo_read_policy(head, head->r.step))
1923 head->r.step++;
1924 if (head->r.step < TOMOYO_MAX_POLICY)
1925 return;
1926 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1927 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1928 head->r.step++;
1929 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1930 return;
1931 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1932 + TOMOYO_MAX_ACL_GROUPS) {
1933 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1934 - TOMOYO_MAX_GROUP;
1935 if (!tomoyo_read_domain2(head, &ns->acl_group
1936 [head->r.acl_group_index]))
1937 return;
1938 head->r.step++;
1939 }
1940 head->r.eof = true;
1941}
1942
1943/* Wait queue for kernel -> userspace notification. */
1944static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1945/* Wait queue for userspace -> kernel notification. */
1946static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1947
1948/* Structure for query. */
1949struct tomoyo_query {
1950 struct list_head list;
1951 struct tomoyo_domain_info *domain;
1952 char *query;
1953 size_t query_len;
1954 unsigned int serial;
1955 u8 timer;
1956 u8 answer;
1957 u8 retry;
1958};
1959
1960/* The list for "struct tomoyo_query". */
1961static LIST_HEAD(tomoyo_query_list);
1962
1963/* Lock for manipulating tomoyo_query_list. */
1964static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1965
1966/*
1967 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1968 * interface.
1969 */
1970static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1971
1972/**
1973 * tomoyo_truncate - Truncate a line.
1974 *
1975 * @str: String to truncate.
1976 *
1977 * Returns length of truncated @str.
1978 */
1979static int tomoyo_truncate(char *str)
1980{
1981 char *start = str;
1982
1983 while (*(unsigned char *) str > (unsigned char) ' ')
1984 str++;
1985 *str = '\0';
1986 return strlen(start) + 1;
1987}
1988
1989/**
1990 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1991 *
1992 * @domain: Pointer to "struct tomoyo_domain_info".
1993 * @header: Lines containing ACL.
1994 *
1995 * Returns nothing.
1996 */
1997static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1998{
1999 char *buffer;
2000 char *realpath = NULL;
2001 char *argv0 = NULL;
2002 char *symlink = NULL;
2003 char *cp = strchr(header, '\n');
2004 int len;
2005
2006 if (!cp)
2007 return;
2008 cp = strchr(cp + 1, '\n');
2009 if (!cp)
2010 return;
2011 *cp++ = '\0';
2012 len = strlen(cp) + 1;
2013 /* strstr() will return NULL if ordering is wrong. */
2014 if (*cp == 'f') {
2015 argv0 = strstr(header, " argv[]={ \"");
2016 if (argv0) {
2017 argv0 += 10;
2018 len += tomoyo_truncate(argv0) + 14;
2019 }
2020 realpath = strstr(header, " exec={ realpath=\"");
2021 if (realpath) {
2022 realpath += 8;
2023 len += tomoyo_truncate(realpath) + 6;
2024 }
2025 symlink = strstr(header, " symlink.target=\"");
2026 if (symlink)
2027 len += tomoyo_truncate(symlink + 1) + 1;
2028 }
2029 buffer = kmalloc(len, GFP_NOFS);
2030 if (!buffer)
2031 return;
2032 snprintf(buffer, len - 1, "%s", cp);
2033 if (realpath)
2034 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2035 if (argv0)
2036 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2037 if (symlink)
2038 tomoyo_addprintf(buffer, len, "%s", symlink);
2039 tomoyo_normalize_line(buffer);
2040 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2041 false))
2042 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2043 kfree(buffer);
2044}
2045
2046/**
2047 * tomoyo_supervisor - Ask for the supervisor's decision.
2048 *
2049 * @r: Pointer to "struct tomoyo_request_info".
2050 * @fmt: The printf()'s format string, followed by parameters.
2051 *
2052 * Returns 0 if the supervisor decided to permit the access request which
2053 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2054 * supervisor decided to retry the access request which violated the policy in
2055 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2056 */
2057int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2058{
2059 va_list args;
2060 int error;
2061 int len;
2062 static unsigned int tomoyo_serial;
2063 struct tomoyo_query entry = { };
2064 bool quota_exceeded = false;
2065
2066 va_start(args, fmt);
2067 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2068 va_end(args);
2069 /* Write /sys/kernel/security/tomoyo/audit. */
2070 va_start(args, fmt);
2071 tomoyo_write_log2(r, len, fmt, args);
2072 va_end(args);
2073 /* Nothing more to do if granted. */
2074 if (r->granted)
2075 return 0;
2076 if (r->mode)
2077 tomoyo_update_stat(r->mode);
2078 switch (r->mode) {
2079 case TOMOYO_CONFIG_ENFORCING:
2080 error = -EPERM;
2081 if (atomic_read(&tomoyo_query_observers))
2082 break;
2083 goto out;
2084 case TOMOYO_CONFIG_LEARNING:
2085 error = 0;
2086 /* Check max_learning_entry parameter. */
2087 if (tomoyo_domain_quota_is_ok(r))
2088 break;
2089 /* fall through */
2090 default:
2091 return 0;
2092 }
2093 /* Get message. */
2094 va_start(args, fmt);
2095 entry.query = tomoyo_init_log(r, len, fmt, args);
2096 va_end(args);
2097 if (!entry.query)
2098 goto out;
2099 entry.query_len = strlen(entry.query) + 1;
2100 if (!error) {
2101 tomoyo_add_entry(r->domain, entry.query);
2102 goto out;
2103 }
2104 len = tomoyo_round2(entry.query_len);
2105 entry.domain = r->domain;
2106 spin_lock(&tomoyo_query_list_lock);
2107 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2108 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2109 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2110 quota_exceeded = true;
2111 } else {
2112 entry.serial = tomoyo_serial++;
2113 entry.retry = r->retry;
2114 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2115 list_add_tail(&entry.list, &tomoyo_query_list);
2116 }
2117 spin_unlock(&tomoyo_query_list_lock);
2118 if (quota_exceeded)
2119 goto out;
2120 /* Give 10 seconds for supervisor's opinion. */
2121 while (entry.timer < 10) {
2122 wake_up_all(&tomoyo_query_wait);
2123 if (wait_event_interruptible_timeout
2124 (tomoyo_answer_wait, entry.answer ||
2125 !atomic_read(&tomoyo_query_observers), HZ))
2126 break;
2127 entry.timer++;
2128 }
2129 spin_lock(&tomoyo_query_list_lock);
2130 list_del(&entry.list);
2131 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2132 spin_unlock(&tomoyo_query_list_lock);
2133 switch (entry.answer) {
2134 case 3: /* Asked to retry by administrator. */
2135 error = TOMOYO_RETRY_REQUEST;
2136 r->retry++;
2137 break;
2138 case 1:
2139 /* Granted by administrator. */
2140 error = 0;
2141 break;
2142 default:
2143 /* Timed out or rejected by administrator. */
2144 break;
2145 }
2146out:
2147 kfree(entry.query);
2148 return error;
2149}
2150
2151/**
2152 * tomoyo_find_domain_by_qid - Get domain by query id.
2153 *
2154 * @serial: Query ID assigned by tomoyo_supervisor().
2155 *
2156 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2157 */
2158static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2159(unsigned int serial)
2160{
2161 struct tomoyo_query *ptr;
2162 struct tomoyo_domain_info *domain = NULL;
2163
2164 spin_lock(&tomoyo_query_list_lock);
2165 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2166 if (ptr->serial != serial)
2167 continue;
2168 domain = ptr->domain;
2169 break;
2170 }
2171 spin_unlock(&tomoyo_query_list_lock);
2172 return domain;
2173}
2174
2175/**
2176 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2177 *
2178 * @file: Pointer to "struct file".
2179 * @wait: Pointer to "poll_table".
2180 *
2181 * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2182 *
2183 * Waits for access requests which violated policy in enforcing mode.
2184 */
2185static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2186{
2187 if (!list_empty(&tomoyo_query_list))
2188 return EPOLLIN | EPOLLRDNORM;
2189 poll_wait(file, &tomoyo_query_wait, wait);
2190 if (!list_empty(&tomoyo_query_list))
2191 return EPOLLIN | EPOLLRDNORM;
2192 return 0;
2193}
2194
2195/**
2196 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2197 *
2198 * @head: Pointer to "struct tomoyo_io_buffer".
2199 */
2200static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2201{
2202 struct list_head *tmp;
2203 unsigned int pos = 0;
2204 size_t len = 0;
2205 char *buf;
2206
2207 if (head->r.w_pos)
2208 return;
2209 kfree(head->read_buf);
2210 head->read_buf = NULL;
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
2215 if (pos++ != head->r.query_index)
2216 continue;
2217 len = ptr->query_len;
2218 break;
2219 }
2220 spin_unlock(&tomoyo_query_list_lock);
2221 if (!len) {
2222 head->r.query_index = 0;
2223 return;
2224 }
2225 buf = kzalloc(len + 32, GFP_NOFS);
2226 if (!buf)
2227 return;
2228 pos = 0;
2229 spin_lock(&tomoyo_query_list_lock);
2230 list_for_each(tmp, &tomoyo_query_list) {
2231 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2232
2233 if (pos++ != head->r.query_index)
2234 continue;
2235 /*
2236 * Some query can be skipped because tomoyo_query_list
2237 * can change, but I don't care.
2238 */
2239 if (len == ptr->query_len)
2240 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2241 ptr->retry, ptr->query);
2242 break;
2243 }
2244 spin_unlock(&tomoyo_query_list_lock);
2245 if (buf[0]) {
2246 head->read_buf = buf;
2247 head->r.w[head->r.w_pos++] = buf;
2248 head->r.query_index++;
2249 } else {
2250 kfree(buf);
2251 }
2252}
2253
2254/**
2255 * tomoyo_write_answer - Write the supervisor's decision.
2256 *
2257 * @head: Pointer to "struct tomoyo_io_buffer".
2258 *
2259 * Returns 0 on success, -EINVAL otherwise.
2260 */
2261static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2262{
2263 char *data = head->write_buf;
2264 struct list_head *tmp;
2265 unsigned int serial;
2266 unsigned int answer;
2267
2268 spin_lock(&tomoyo_query_list_lock);
2269 list_for_each(tmp, &tomoyo_query_list) {
2270 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2271
2272 ptr->timer = 0;
2273 }
2274 spin_unlock(&tomoyo_query_list_lock);
2275 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2276 return -EINVAL;
2277 spin_lock(&tomoyo_query_list_lock);
2278 list_for_each(tmp, &tomoyo_query_list) {
2279 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2280
2281 if (ptr->serial != serial)
2282 continue;
2283 ptr->answer = answer;
2284 /* Remove from tomoyo_query_list. */
2285 if (ptr->answer)
2286 list_del_init(&ptr->list);
2287 break;
2288 }
2289 spin_unlock(&tomoyo_query_list_lock);
2290 return 0;
2291}
2292
2293/**
2294 * tomoyo_read_version: Get version.
2295 *
2296 * @head: Pointer to "struct tomoyo_io_buffer".
2297 *
2298 * Returns version information.
2299 */
2300static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2301{
2302 if (!head->r.eof) {
2303 tomoyo_io_printf(head, "2.6.0");
2304 head->r.eof = true;
2305 }
2306}
2307
2308/* String table for /sys/kernel/security/tomoyo/stat interface. */
2309static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2310 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2311 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2312 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2313 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2314};
2315
2316/* String table for /sys/kernel/security/tomoyo/stat interface. */
2317static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2318 [TOMOYO_MEMORY_POLICY] = "policy:",
2319 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2320 [TOMOYO_MEMORY_QUERY] = "query message:",
2321};
2322
2323/* Timestamp counter for last updated. */
2324static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2325/* Counter for number of updates. */
2326static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2327
2328/**
2329 * tomoyo_update_stat - Update statistic counters.
2330 *
2331 * @index: Index for policy type.
2332 *
2333 * Returns nothing.
2334 */
2335void tomoyo_update_stat(const u8 index)
2336{
2337 /*
2338 * I don't use atomic operations because race condition is not fatal.
2339 */
2340 tomoyo_stat_updated[index]++;
2341 tomoyo_stat_modified[index] = ktime_get_real_seconds();
2342}
2343
2344/**
2345 * tomoyo_read_stat - Read statistic data.
2346 *
2347 * @head: Pointer to "struct tomoyo_io_buffer".
2348 *
2349 * Returns nothing.
2350 */
2351static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2352{
2353 u8 i;
2354 unsigned int total = 0;
2355
2356 if (head->r.eof)
2357 return;
2358 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2359 tomoyo_io_printf(head, "Policy %-30s %10u",
2360 tomoyo_policy_headers[i],
2361 tomoyo_stat_updated[i]);
2362 if (tomoyo_stat_modified[i]) {
2363 struct tomoyo_time stamp;
2364
2365 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2366 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2367 stamp.year, stamp.month, stamp.day,
2368 stamp.hour, stamp.min, stamp.sec);
2369 }
2370 tomoyo_set_lf(head);
2371 }
2372 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2373 unsigned int used = tomoyo_memory_used[i];
2374
2375 total += used;
2376 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2377 tomoyo_memory_headers[i], used);
2378 used = tomoyo_memory_quota[i];
2379 if (used)
2380 tomoyo_io_printf(head, " (Quota: %10u)", used);
2381 tomoyo_set_lf(head);
2382 }
2383 tomoyo_io_printf(head, "Total memory used: %10u\n",
2384 total);
2385 head->r.eof = true;
2386}
2387
2388/**
2389 * tomoyo_write_stat - Set memory quota.
2390 *
2391 * @head: Pointer to "struct tomoyo_io_buffer".
2392 *
2393 * Returns 0.
2394 */
2395static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2396{
2397 char *data = head->write_buf;
2398 u8 i;
2399
2400 if (tomoyo_str_starts(&data, "Memory used by "))
2401 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2402 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2403 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2404 return 0;
2405}
2406
2407/**
2408 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2409 *
2410 * @type: Type of interface.
2411 * @file: Pointer to "struct file".
2412 *
2413 * Returns 0 on success, negative value otherwise.
2414 */
2415int tomoyo_open_control(const u8 type, struct file *file)
2416{
2417 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2418
2419 if (!head)
2420 return -ENOMEM;
2421 mutex_init(&head->io_sem);
2422 head->type = type;
2423 switch (type) {
2424 case TOMOYO_DOMAINPOLICY:
2425 /* /sys/kernel/security/tomoyo/domain_policy */
2426 head->write = tomoyo_write_domain;
2427 head->read = tomoyo_read_domain;
2428 break;
2429 case TOMOYO_EXCEPTIONPOLICY:
2430 /* /sys/kernel/security/tomoyo/exception_policy */
2431 head->write = tomoyo_write_exception;
2432 head->read = tomoyo_read_exception;
2433 break;
2434 case TOMOYO_AUDIT:
2435 /* /sys/kernel/security/tomoyo/audit */
2436 head->poll = tomoyo_poll_log;
2437 head->read = tomoyo_read_log;
2438 break;
2439 case TOMOYO_PROCESS_STATUS:
2440 /* /sys/kernel/security/tomoyo/.process_status */
2441 head->write = tomoyo_write_pid;
2442 head->read = tomoyo_read_pid;
2443 break;
2444 case TOMOYO_VERSION:
2445 /* /sys/kernel/security/tomoyo/version */
2446 head->read = tomoyo_read_version;
2447 head->readbuf_size = 128;
2448 break;
2449 case TOMOYO_STAT:
2450 /* /sys/kernel/security/tomoyo/stat */
2451 head->write = tomoyo_write_stat;
2452 head->read = tomoyo_read_stat;
2453 head->readbuf_size = 1024;
2454 break;
2455 case TOMOYO_PROFILE:
2456 /* /sys/kernel/security/tomoyo/profile */
2457 head->write = tomoyo_write_profile;
2458 head->read = tomoyo_read_profile;
2459 break;
2460 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2461 head->poll = tomoyo_poll_query;
2462 head->write = tomoyo_write_answer;
2463 head->read = tomoyo_read_query;
2464 break;
2465 case TOMOYO_MANAGER:
2466 /* /sys/kernel/security/tomoyo/manager */
2467 head->write = tomoyo_write_manager;
2468 head->read = tomoyo_read_manager;
2469 break;
2470 }
2471 if (!(file->f_mode & FMODE_READ)) {
2472 /*
2473 * No need to allocate read_buf since it is not opened
2474 * for reading.
2475 */
2476 head->read = NULL;
2477 head->poll = NULL;
2478 } else if (!head->poll) {
2479 /* Don't allocate read_buf for poll() access. */
2480 if (!head->readbuf_size)
2481 head->readbuf_size = 4096 * 2;
2482 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2483 if (!head->read_buf) {
2484 kfree(head);
2485 return -ENOMEM;
2486 }
2487 }
2488 if (!(file->f_mode & FMODE_WRITE)) {
2489 /*
2490 * No need to allocate write_buf since it is not opened
2491 * for writing.
2492 */
2493 head->write = NULL;
2494 } else if (head->write) {
2495 head->writebuf_size = 4096 * 2;
2496 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2497 if (!head->write_buf) {
2498 kfree(head->read_buf);
2499 kfree(head);
2500 return -ENOMEM;
2501 }
2502 }
2503 /*
2504 * If the file is /sys/kernel/security/tomoyo/query , increment the
2505 * observer counter.
2506 * The obserber counter is used by tomoyo_supervisor() to see if
2507 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2508 */
2509 if (type == TOMOYO_QUERY)
2510 atomic_inc(&tomoyo_query_observers);
2511 file->private_data = head;
2512 tomoyo_notify_gc(head, true);
2513 return 0;
2514}
2515
2516/**
2517 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2518 *
2519 * @file: Pointer to "struct file".
2520 * @wait: Pointer to "poll_table". Maybe NULL.
2521 *
2522 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2523 * EPOLLOUT | EPOLLWRNORM otherwise.
2524 */
2525__poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2526{
2527 struct tomoyo_io_buffer *head = file->private_data;
2528
2529 if (head->poll)
2530 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2531 return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2532}
2533
2534/**
2535 * tomoyo_set_namespace_cursor - Set namespace to read.
2536 *
2537 * @head: Pointer to "struct tomoyo_io_buffer".
2538 *
2539 * Returns nothing.
2540 */
2541static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2542{
2543 struct list_head *ns;
2544
2545 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2546 head->type != TOMOYO_PROFILE)
2547 return;
2548 /*
2549 * If this is the first read, or reading previous namespace finished
2550 * and has more namespaces to read, update the namespace cursor.
2551 */
2552 ns = head->r.ns;
2553 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2554 /* Clearing is OK because tomoyo_flush() returned true. */
2555 memset(&head->r, 0, sizeof(head->r));
2556 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2557 }
2558}
2559
2560/**
2561 * tomoyo_has_more_namespace - Check for unread namespaces.
2562 *
2563 * @head: Pointer to "struct tomoyo_io_buffer".
2564 *
2565 * Returns true if we have more entries to print, false otherwise.
2566 */
2567static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2568{
2569 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2570 head->type == TOMOYO_PROFILE) && head->r.eof &&
2571 head->r.ns->next != &tomoyo_namespace_list;
2572}
2573
2574/**
2575 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2576 *
2577 * @head: Pointer to "struct tomoyo_io_buffer".
2578 * @buffer: Poiner to buffer to write to.
2579 * @buffer_len: Size of @buffer.
2580 *
2581 * Returns bytes read on success, negative value otherwise.
2582 */
2583ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2584 const int buffer_len)
2585{
2586 int len;
2587 int idx;
2588
2589 if (!head->read)
2590 return -EINVAL;
2591 if (mutex_lock_interruptible(&head->io_sem))
2592 return -EINTR;
2593 head->read_user_buf = buffer;
2594 head->read_user_buf_avail = buffer_len;
2595 idx = tomoyo_read_lock();
2596 if (tomoyo_flush(head))
2597 /* Call the policy handler. */
2598 do {
2599 tomoyo_set_namespace_cursor(head);
2600 head->read(head);
2601 } while (tomoyo_flush(head) &&
2602 tomoyo_has_more_namespace(head));
2603 tomoyo_read_unlock(idx);
2604 len = head->read_user_buf - buffer;
2605 mutex_unlock(&head->io_sem);
2606 return len;
2607}
2608
2609/**
2610 * tomoyo_parse_policy - Parse a policy line.
2611 *
2612 * @head: Poiter to "struct tomoyo_io_buffer".
2613 * @line: Line to parse.
2614 *
2615 * Returns 0 on success, negative value otherwise.
2616 *
2617 * Caller holds tomoyo_read_lock().
2618 */
2619static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2620{
2621 /* Delete request? */
2622 head->w.is_delete = !strncmp(line, "delete ", 7);
2623 if (head->w.is_delete)
2624 memmove(line, line + 7, strlen(line + 7) + 1);
2625 /* Selecting namespace to update. */
2626 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2627 head->type == TOMOYO_PROFILE) {
2628 if (*line == '<') {
2629 char *cp = strchr(line, ' ');
2630
2631 if (cp) {
2632 *cp++ = '\0';
2633 head->w.ns = tomoyo_assign_namespace(line);
2634 memmove(line, cp, strlen(cp) + 1);
2635 } else
2636 head->w.ns = NULL;
2637 } else
2638 head->w.ns = &tomoyo_kernel_namespace;
2639 /* Don't allow updating if namespace is invalid. */
2640 if (!head->w.ns)
2641 return -ENOENT;
2642 }
2643 /* Do the update. */
2644 return head->write(head);
2645}
2646
2647/**
2648 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2649 *
2650 * @head: Pointer to "struct tomoyo_io_buffer".
2651 * @buffer: Pointer to buffer to read from.
2652 * @buffer_len: Size of @buffer.
2653 *
2654 * Returns @buffer_len on success, negative value otherwise.
2655 */
2656ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2657 const char __user *buffer, const int buffer_len)
2658{
2659 int error = buffer_len;
2660 size_t avail_len = buffer_len;
2661 char *cp0 = head->write_buf;
2662 int idx;
2663
2664 if (!head->write)
2665 return -EINVAL;
2666 if (!access_ok(buffer, buffer_len))
2667 return -EFAULT;
2668 if (mutex_lock_interruptible(&head->io_sem))
2669 return -EINTR;
2670 head->read_user_buf_avail = 0;
2671 idx = tomoyo_read_lock();
2672 /* Read a line and dispatch it to the policy handler. */
2673 while (avail_len > 0) {
2674 char c;
2675
2676 if (head->w.avail >= head->writebuf_size - 1) {
2677 const int len = head->writebuf_size * 2;
2678 char *cp = kzalloc(len, GFP_NOFS);
2679
2680 if (!cp) {
2681 error = -ENOMEM;
2682 break;
2683 }
2684 memmove(cp, cp0, head->w.avail);
2685 kfree(cp0);
2686 head->write_buf = cp;
2687 cp0 = cp;
2688 head->writebuf_size = len;
2689 }
2690 if (get_user(c, buffer)) {
2691 error = -EFAULT;
2692 break;
2693 }
2694 buffer++;
2695 avail_len--;
2696 cp0[head->w.avail++] = c;
2697 if (c != '\n')
2698 continue;
2699 cp0[head->w.avail - 1] = '\0';
2700 head->w.avail = 0;
2701 tomoyo_normalize_line(cp0);
2702 if (!strcmp(cp0, "reset")) {
2703 head->w.ns = &tomoyo_kernel_namespace;
2704 head->w.domain = NULL;
2705 memset(&head->r, 0, sizeof(head->r));
2706 continue;
2707 }
2708 /* Don't allow updating policies by non manager programs. */
2709 switch (head->type) {
2710 case TOMOYO_PROCESS_STATUS:
2711 /* This does not write anything. */
2712 break;
2713 case TOMOYO_DOMAINPOLICY:
2714 if (tomoyo_select_domain(head, cp0))
2715 continue;
2716 /* fall through */
2717 case TOMOYO_EXCEPTIONPOLICY:
2718 if (!strcmp(cp0, "select transition_only")) {
2719 head->r.print_transition_related_only = true;
2720 continue;
2721 }
2722 /* fall through */
2723 default:
2724 if (!tomoyo_manager()) {
2725 error = -EPERM;
2726 goto out;
2727 }
2728 }
2729 switch (tomoyo_parse_policy(head, cp0)) {
2730 case -EPERM:
2731 error = -EPERM;
2732 goto out;
2733 case 0:
2734 switch (head->type) {
2735 case TOMOYO_DOMAINPOLICY:
2736 case TOMOYO_EXCEPTIONPOLICY:
2737 case TOMOYO_STAT:
2738 case TOMOYO_PROFILE:
2739 case TOMOYO_MANAGER:
2740 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2741 break;
2742 default:
2743 break;
2744 }
2745 break;
2746 }
2747 }
2748out:
2749 tomoyo_read_unlock(idx);
2750 mutex_unlock(&head->io_sem);
2751 return error;
2752}
2753
2754/**
2755 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2756 *
2757 * @head: Pointer to "struct tomoyo_io_buffer".
2758 */
2759void tomoyo_close_control(struct tomoyo_io_buffer *head)
2760{
2761 /*
2762 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2763 * observer counter.
2764 */
2765 if (head->type == TOMOYO_QUERY &&
2766 atomic_dec_and_test(&tomoyo_query_observers))
2767 wake_up_all(&tomoyo_answer_wait);
2768 tomoyo_notify_gc(head, false);
2769}
2770
2771/**
2772 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2773 */
2774void tomoyo_check_profile(void)
2775{
2776 struct tomoyo_domain_info *domain;
2777 const int idx = tomoyo_read_lock();
2778
2779 tomoyo_policy_loaded = true;
2780 pr_info("TOMOYO: 2.6.0\n");
2781 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2782 const u8 profile = domain->profile;
2783 struct tomoyo_policy_namespace *ns = domain->ns;
2784
2785 if (ns->profile_version == 20110903) {
2786 pr_info_once("Converting profile version from %u to %u.\n",
2787 20110903, 20150505);
2788 ns->profile_version = 20150505;
2789 }
2790 if (ns->profile_version != 20150505)
2791 pr_err("Profile version %u is not supported.\n",
2792 ns->profile_version);
2793 else if (!ns->profile_ptr[profile])
2794 pr_err("Profile %u (used by '%s') is not defined.\n",
2795 profile, domain->domainname->name);
2796 else
2797 continue;
2798 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2799 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2800 panic("STOP!");
2801 }
2802 tomoyo_read_unlock(idx);
2803 pr_info("Mandatory Access Control activated.\n");
2804}
2805
2806/**
2807 * tomoyo_load_builtin_policy - Load built-in policy.
2808 *
2809 * Returns nothing.
2810 */
2811void __init tomoyo_load_builtin_policy(void)
2812{
2813#ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2814 static char tomoyo_builtin_profile[] __initdata =
2815 "PROFILE_VERSION=20150505\n"
2816 "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2817 static char tomoyo_builtin_exception_policy[] __initdata =
2818 "aggregator proc:/self/exe /proc/self/exe\n";
2819 static char tomoyo_builtin_domain_policy[] __initdata = "";
2820 static char tomoyo_builtin_manager[] __initdata = "";
2821 static char tomoyo_builtin_stat[] __initdata = "";
2822#else
2823 /*
2824 * This include file is manually created and contains built-in policy
2825 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2826 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2827 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2828 */
2829#include "builtin-policy.h"
2830#endif
2831 u8 i;
2832 const int idx = tomoyo_read_lock();
2833
2834 for (i = 0; i < 5; i++) {
2835 struct tomoyo_io_buffer head = { };
2836 char *start = "";
2837
2838 switch (i) {
2839 case 0:
2840 start = tomoyo_builtin_profile;
2841 head.type = TOMOYO_PROFILE;
2842 head.write = tomoyo_write_profile;
2843 break;
2844 case 1:
2845 start = tomoyo_builtin_exception_policy;
2846 head.type = TOMOYO_EXCEPTIONPOLICY;
2847 head.write = tomoyo_write_exception;
2848 break;
2849 case 2:
2850 start = tomoyo_builtin_domain_policy;
2851 head.type = TOMOYO_DOMAINPOLICY;
2852 head.write = tomoyo_write_domain;
2853 break;
2854 case 3:
2855 start = tomoyo_builtin_manager;
2856 head.type = TOMOYO_MANAGER;
2857 head.write = tomoyo_write_manager;
2858 break;
2859 case 4:
2860 start = tomoyo_builtin_stat;
2861 head.type = TOMOYO_STAT;
2862 head.write = tomoyo_write_stat;
2863 break;
2864 }
2865 while (1) {
2866 char *end = strchr(start, '\n');
2867
2868 if (!end)
2869 break;
2870 *end = '\0';
2871 tomoyo_normalize_line(start);
2872 head.write_buf = start;
2873 tomoyo_parse_policy(&head, start);
2874 start = end + 1;
2875 }
2876 }
2877 tomoyo_read_unlock(idx);
2878#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2879 tomoyo_check_profile();
2880#endif
2881}