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perf/core: Fix exclusive events' grouping
[thirdparty/kernel/stable.git] / security / tomoyo / common.c
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. */
14 const 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 */
22 const 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. */
73 const 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. */
136 static 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. */
142 const 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. */
157 const 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. */
165 static 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? */
173 static 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 */
182 const 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 */
196 static 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 */
213 static 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 */
259 static 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
268 static 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 */
277 static 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 */
305 static 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 */
317 static 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 */
330 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
331 {
332 tomoyo_set_string(head, "/");
333 }
334
335 /* List of namespaces. */
336 LIST_HEAD(tomoyo_namespace_list);
337 /* True if namespace other than tomoyo_kernel_namespace is defined. */
338 static 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 */
347 void 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 */
369 static 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 */
386 static 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 */
406 static 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 */
427 static 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 */
475 static 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 */
490 static 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 */
534 struct 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 */
553 static 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 */
576 static 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 */
594 static 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 */
674 static 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 */
729 static 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 */
744 static 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 */
844 static 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 */
861 static 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), &param,
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 */
893 static 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 */
911 static 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 */
937 static 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 = false;
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
976 static 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 */
989 static 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 */
1042 static 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 */
1060 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1061 {
1062 int error = -EINVAL;
1063
1064 if (tomoyo_str_starts(&param->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 */
1088 static 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 */
1124 static 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(&param.data,
1148 tomoyo_callback[i].keyword))
1149 continue;
1150 return tomoyo_callback[i].write(&param);
1151 }
1152 return -EINVAL;
1153 }
1154
1155 /* String table for domain flags. */
1156 const 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 */
1170 static 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 */
1230 static 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 */
1371 static 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 */
1390 static 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;
1575 print_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 */
1595 static 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 */
1616 static 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 */
1678 static 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 */
1694 static 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. */
1729 static 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. */
1739 static 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 */
1754 static 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(&param.data, "aggregator "))
1765 return tomoyo_write_aggregator(&param);
1766 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1767 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1768 return tomoyo_write_transition_control(&param, i);
1769 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1770 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1771 return tomoyo_write_group(&param, i);
1772 if (tomoyo_str_starts(&param.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 */
1795 static 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 */
1854 static 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 */
1914 static 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. */
1944 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1945 /* Wait queue for userspace -> kernel notification. */
1946 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1947
1948 /* Structure for query. */
1949 struct 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". */
1961 static LIST_HEAD(tomoyo_query_list);
1962
1963 /* Lock for manipulating tomoyo_query_list. */
1964 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1965
1966 /*
1967 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1968 * interface.
1969 */
1970 static 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 */
1979 static 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 */
1997 static 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 */
2057 int 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 }
2146 out:
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 */
2158 static 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 */
2185 static __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 */
2200 static 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 */
2261 static 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 */
2300 static 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. */
2309 static 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. */
2317 static 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. */
2324 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2325 /* Counter for number of updates. */
2326 static 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 */
2335 void 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 */
2351 static 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 */
2395 static 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 */
2415 int 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 */
2541 static 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 */
2567 static 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 */
2583 ssize_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 */
2619 static 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 */
2656 ssize_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 }
2748 out:
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 */
2759 void 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 */
2774 void 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 */
2811 void __init tomoyo_load_builtin_policy(void)
2812 {
2813 /*
2814 * This include file is manually created and contains built-in policy
2815 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2816 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2817 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2818 */
2819 #include "builtin-policy.h"
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 }
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git