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