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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
[linux/fpc-iii.git] / security / tomoyo / common.c
blob2e0f12c629386da35b3b26fc37dfb973db57440d
1 /*
2 * security/tomoyo/common.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7 #include <linux/uaccess.h>
8 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include "common.h"
11
12 /* String table for operation mode. */
13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
14 [TOMOYO_CONFIG_DISABLED] = "disabled",
15 [TOMOYO_CONFIG_LEARNING] = "learning",
16 [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
17 [TOMOYO_CONFIG_ENFORCING] = "enforcing"
18 };
19
20 /* String table for /sys/kernel/security/tomoyo/profile */
21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
22 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
23 /* CONFIG::file group */
24 [TOMOYO_MAC_FILE_EXECUTE] = "execute",
25 [TOMOYO_MAC_FILE_OPEN] = "open",
26 [TOMOYO_MAC_FILE_CREATE] = "create",
27 [TOMOYO_MAC_FILE_UNLINK] = "unlink",
28 [TOMOYO_MAC_FILE_GETATTR] = "getattr",
29 [TOMOYO_MAC_FILE_MKDIR] = "mkdir",
30 [TOMOYO_MAC_FILE_RMDIR] = "rmdir",
31 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo",
32 [TOMOYO_MAC_FILE_MKSOCK] = "mksock",
33 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate",
34 [TOMOYO_MAC_FILE_SYMLINK] = "symlink",
35 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock",
36 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar",
37 [TOMOYO_MAC_FILE_LINK] = "link",
38 [TOMOYO_MAC_FILE_RENAME] = "rename",
39 [TOMOYO_MAC_FILE_CHMOD] = "chmod",
40 [TOMOYO_MAC_FILE_CHOWN] = "chown",
41 [TOMOYO_MAC_FILE_CHGRP] = "chgrp",
42 [TOMOYO_MAC_FILE_IOCTL] = "ioctl",
43 [TOMOYO_MAC_FILE_CHROOT] = "chroot",
44 [TOMOYO_MAC_FILE_MOUNT] = "mount",
45 [TOMOYO_MAC_FILE_UMOUNT] = "unmount",
46 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
47 /* CONFIG::network group */
48 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind",
49 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen",
50 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect",
51 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind",
52 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send",
53 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind",
54 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send",
55 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind",
56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen",
57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect",
58 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind",
59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send",
60 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind",
61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen",
62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
63 /* CONFIG::misc group */
64 [TOMOYO_MAC_ENVIRON] = "env",
65 /* CONFIG group */
66 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
69 };
70
71 /* String table for conditions. */
72 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
73 [TOMOYO_TASK_UID] = "task.uid",
74 [TOMOYO_TASK_EUID] = "task.euid",
75 [TOMOYO_TASK_SUID] = "task.suid",
76 [TOMOYO_TASK_FSUID] = "task.fsuid",
77 [TOMOYO_TASK_GID] = "task.gid",
78 [TOMOYO_TASK_EGID] = "task.egid",
79 [TOMOYO_TASK_SGID] = "task.sgid",
80 [TOMOYO_TASK_FSGID] = "task.fsgid",
81 [TOMOYO_TASK_PID] = "task.pid",
82 [TOMOYO_TASK_PPID] = "task.ppid",
83 [TOMOYO_EXEC_ARGC] = "exec.argc",
84 [TOMOYO_EXEC_ENVC] = "exec.envc",
85 [TOMOYO_TYPE_IS_SOCKET] = "socket",
86 [TOMOYO_TYPE_IS_SYMLINK] = "symlink",
87 [TOMOYO_TYPE_IS_FILE] = "file",
88 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
89 [TOMOYO_TYPE_IS_DIRECTORY] = "directory",
90 [TOMOYO_TYPE_IS_CHAR_DEV] = "char",
91 [TOMOYO_TYPE_IS_FIFO] = "fifo",
92 [TOMOYO_MODE_SETUID] = "setuid",
93 [TOMOYO_MODE_SETGID] = "setgid",
94 [TOMOYO_MODE_STICKY] = "sticky",
95 [TOMOYO_MODE_OWNER_READ] = "owner_read",
96 [TOMOYO_MODE_OWNER_WRITE] = "owner_write",
97 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
98 [TOMOYO_MODE_GROUP_READ] = "group_read",
99 [TOMOYO_MODE_GROUP_WRITE] = "group_write",
100 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
101 [TOMOYO_MODE_OTHERS_READ] = "others_read",
102 [TOMOYO_MODE_OTHERS_WRITE] = "others_write",
103 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
104 [TOMOYO_EXEC_REALPATH] = "exec.realpath",
105 [TOMOYO_SYMLINK_TARGET] = "symlink.target",
106 [TOMOYO_PATH1_UID] = "path1.uid",
107 [TOMOYO_PATH1_GID] = "path1.gid",
108 [TOMOYO_PATH1_INO] = "path1.ino",
109 [TOMOYO_PATH1_MAJOR] = "path1.major",
110 [TOMOYO_PATH1_MINOR] = "path1.minor",
111 [TOMOYO_PATH1_PERM] = "path1.perm",
112 [TOMOYO_PATH1_TYPE] = "path1.type",
113 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
114 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
115 [TOMOYO_PATH2_UID] = "path2.uid",
116 [TOMOYO_PATH2_GID] = "path2.gid",
117 [TOMOYO_PATH2_INO] = "path2.ino",
118 [TOMOYO_PATH2_MAJOR] = "path2.major",
119 [TOMOYO_PATH2_MINOR] = "path2.minor",
120 [TOMOYO_PATH2_PERM] = "path2.perm",
121 [TOMOYO_PATH2_TYPE] = "path2.type",
122 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
123 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
124 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
125 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
126 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
127 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
128 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
129 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
130 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
131 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
132 };
133
134 /* String table for PREFERENCE keyword. */
135 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
136 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
137 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
138 };
139
140 /* String table for path operation. */
141 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
142 [TOMOYO_TYPE_EXECUTE] = "execute",
143 [TOMOYO_TYPE_READ] = "read",
144 [TOMOYO_TYPE_WRITE] = "write",
145 [TOMOYO_TYPE_APPEND] = "append",
146 [TOMOYO_TYPE_UNLINK] = "unlink",
147 [TOMOYO_TYPE_GETATTR] = "getattr",
148 [TOMOYO_TYPE_RMDIR] = "rmdir",
149 [TOMOYO_TYPE_TRUNCATE] = "truncate",
150 [TOMOYO_TYPE_SYMLINK] = "symlink",
151 [TOMOYO_TYPE_CHROOT] = "chroot",
152 [TOMOYO_TYPE_UMOUNT] = "unmount",
153 };
154
155 /* String table for socket's operation. */
156 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
157 [TOMOYO_NETWORK_BIND] = "bind",
158 [TOMOYO_NETWORK_LISTEN] = "listen",
159 [TOMOYO_NETWORK_CONNECT] = "connect",
160 [TOMOYO_NETWORK_SEND] = "send",
161 };
162
163 /* String table for categories. */
164 static const char * const tomoyo_category_keywords
165 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
166 [TOMOYO_MAC_CATEGORY_FILE] = "file",
167 [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
168 [TOMOYO_MAC_CATEGORY_MISC] = "misc",
169 };
170
171 /* Permit policy management by non-root user? */
172 static bool tomoyo_manage_by_non_root;
173
174 /* Utility functions. */
175
176 /**
177 * tomoyo_yesno - Return "yes" or "no".
178 *
179 * @value: Bool value.
180 */
181 const char *tomoyo_yesno(const unsigned int value)
182 {
183 return value ? "yes" : "no";
184 }
185
186 /**
187 * tomoyo_addprintf - strncat()-like-snprintf().
188 *
189 * @buffer: Buffer to write to. Must be '\0'-terminated.
190 * @len: Size of @buffer.
191 * @fmt: The printf()'s format string, followed by parameters.
192 *
193 * Returns nothing.
194 */
195 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
196 {
197 va_list args;
198 const int pos = strlen(buffer);
199 va_start(args, fmt);
200 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
201 va_end(args);
202 }
203
204 /**
205 * tomoyo_flush - Flush queued string to userspace's buffer.
206 *
207 * @head: Pointer to "struct tomoyo_io_buffer".
208 *
209 * Returns true if all data was flushed, false otherwise.
210 */
211 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
212 {
213 while (head->r.w_pos) {
214 const char *w = head->r.w[0];
215 size_t len = strlen(w);
216 if (len) {
217 if (len > head->read_user_buf_avail)
218 len = head->read_user_buf_avail;
219 if (!len)
220 return false;
221 if (copy_to_user(head->read_user_buf, w, len))
222 return false;
223 head->read_user_buf_avail -= len;
224 head->read_user_buf += len;
225 w += len;
226 }
227 head->r.w[0] = w;
228 if (*w)
229 return false;
230 /* Add '\0' for audit logs and query. */
231 if (head->poll) {
232 if (!head->read_user_buf_avail ||
233 copy_to_user(head->read_user_buf, "", 1))
234 return false;
235 head->read_user_buf_avail--;
236 head->read_user_buf++;
237 }
238 head->r.w_pos--;
239 for (len = 0; len < head->r.w_pos; len++)
240 head->r.w[len] = head->r.w[len + 1];
241 }
242 head->r.avail = 0;
243 return true;
244 }
245
246 /**
247 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
248 *
249 * @head: Pointer to "struct tomoyo_io_buffer".
250 * @string: String to print.
251 *
252 * Note that @string has to be kept valid until @head is kfree()d.
253 * This means that char[] allocated on stack memory cannot be passed to
254 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
255 */
256 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
257 {
258 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
259 head->r.w[head->r.w_pos++] = string;
260 tomoyo_flush(head);
261 } else
262 WARN_ON(1);
263 }
264
265 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
266 ...) __printf(2, 3);
267
268 /**
269 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
270 *
271 * @head: Pointer to "struct tomoyo_io_buffer".
272 * @fmt: The printf()'s format string, followed by parameters.
273 */
274 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
275 ...)
276 {
277 va_list args;
278 size_t len;
279 size_t pos = head->r.avail;
280 int size = head->readbuf_size - pos;
281 if (size <= 0)
282 return;
283 va_start(args, fmt);
284 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
285 va_end(args);
286 if (pos + len >= head->readbuf_size) {
287 WARN_ON(1);
288 return;
289 }
290 head->r.avail += len;
291 tomoyo_set_string(head, head->read_buf + pos);
292 }
293
294 /**
295 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
296 *
297 * @head: Pointer to "struct tomoyo_io_buffer".
298 *
299 * Returns nothing.
300 */
301 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
302 {
303 tomoyo_set_string(head, " ");
304 }
305
306 /**
307 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
308 *
309 * @head: Pointer to "struct tomoyo_io_buffer".
310 *
311 * Returns nothing.
312 */
313 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
314 {
315 tomoyo_set_string(head, "\n");
316 return !head->r.w_pos;
317 }
318
319 /**
320 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
321 *
322 * @head: Pointer to "struct tomoyo_io_buffer".
323 *
324 * Returns nothing.
325 */
326 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
327 {
328 tomoyo_set_string(head, "/");
329 }
330
331 /* List of namespaces. */
332 LIST_HEAD(tomoyo_namespace_list);
333 /* True if namespace other than tomoyo_kernel_namespace is defined. */
334 static bool tomoyo_namespace_enabled;
335
336 /**
337 * tomoyo_init_policy_namespace - Initialize namespace.
338 *
339 * @ns: Pointer to "struct tomoyo_policy_namespace".
340 *
341 * Returns nothing.
342 */
343 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
344 {
345 unsigned int idx;
346 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
347 INIT_LIST_HEAD(&ns->acl_group[idx]);
348 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
349 INIT_LIST_HEAD(&ns->group_list[idx]);
350 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
351 INIT_LIST_HEAD(&ns->policy_list[idx]);
352 ns->profile_version = 20110903;
353 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
354 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
355 }
356
357 /**
358 * tomoyo_print_namespace - Print namespace header.
359 *
360 * @head: Pointer to "struct tomoyo_io_buffer".
361 *
362 * Returns nothing.
363 */
364 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
365 {
366 if (!tomoyo_namespace_enabled)
367 return;
368 tomoyo_set_string(head,
369 container_of(head->r.ns,
370 struct tomoyo_policy_namespace,
371 namespace_list)->name);
372 tomoyo_set_space(head);
373 }
374
375 /**
376 * tomoyo_print_name_union - Print a tomoyo_name_union.
377 *
378 * @head: Pointer to "struct tomoyo_io_buffer".
379 * @ptr: Pointer to "struct tomoyo_name_union".
380 */
381 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
382 const struct tomoyo_name_union *ptr)
383 {
384 tomoyo_set_space(head);
385 if (ptr->group) {
386 tomoyo_set_string(head, "@");
387 tomoyo_set_string(head, ptr->group->group_name->name);
388 } else {
389 tomoyo_set_string(head, ptr->filename->name);
390 }
391 }
392
393 /**
394 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
395 *
396 * @head: Pointer to "struct tomoyo_io_buffer".
397 * @ptr: Pointer to "struct tomoyo_name_union".
398 *
399 * Returns nothing.
400 */
401 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
402 const struct tomoyo_name_union *ptr)
403 {
404 if (ptr->group) {
405 tomoyo_set_string(head, "@");
406 tomoyo_set_string(head, ptr->group->group_name->name);
407 } else {
408 tomoyo_set_string(head, "\"");
409 tomoyo_set_string(head, ptr->filename->name);
410 tomoyo_set_string(head, "\"");
411 }
412 }
413
414 /**
415 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
416 *
417 * @head: Pointer to "struct tomoyo_io_buffer".
418 * @ptr: Pointer to "struct tomoyo_number_union".
419 *
420 * Returns nothing.
421 */
422 static void tomoyo_print_number_union_nospace
423 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
424 {
425 if (ptr->group) {
426 tomoyo_set_string(head, "@");
427 tomoyo_set_string(head, ptr->group->group_name->name);
428 } else {
429 int i;
430 unsigned long min = ptr->values[0];
431 const unsigned long max = ptr->values[1];
432 u8 min_type = ptr->value_type[0];
433 const u8 max_type = ptr->value_type[1];
434 char buffer[128];
435 buffer[0] = '\0';
436 for (i = 0; i < 2; i++) {
437 switch (min_type) {
438 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
439 tomoyo_addprintf(buffer, sizeof(buffer),
440 "0x%lX", min);
441 break;
442 case TOMOYO_VALUE_TYPE_OCTAL:
443 tomoyo_addprintf(buffer, sizeof(buffer),
444 "0%lo", min);
445 break;
446 default:
447 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
448 min);
449 break;
450 }
451 if (min == max && min_type == max_type)
452 break;
453 tomoyo_addprintf(buffer, sizeof(buffer), "-");
454 min_type = max_type;
455 min = max;
456 }
457 tomoyo_io_printf(head, "%s", buffer);
458 }
459 }
460
461 /**
462 * tomoyo_print_number_union - Print a tomoyo_number_union.
463 *
464 * @head: Pointer to "struct tomoyo_io_buffer".
465 * @ptr: Pointer to "struct tomoyo_number_union".
466 *
467 * Returns nothing.
468 */
469 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
470 const struct tomoyo_number_union *ptr)
471 {
472 tomoyo_set_space(head);
473 tomoyo_print_number_union_nospace(head, ptr);
474 }
475
476 /**
477 * tomoyo_assign_profile - Create a new profile.
478 *
479 * @ns: Pointer to "struct tomoyo_policy_namespace".
480 * @profile: Profile number to create.
481 *
482 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
483 */
484 static struct tomoyo_profile *tomoyo_assign_profile
485 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
486 {
487 struct tomoyo_profile *ptr;
488 struct tomoyo_profile *entry;
489 if (profile >= TOMOYO_MAX_PROFILES)
490 return NULL;
491 ptr = ns->profile_ptr[profile];
492 if (ptr)
493 return ptr;
494 entry = kzalloc(sizeof(*entry), GFP_NOFS);
495 if (mutex_lock_interruptible(&tomoyo_policy_lock))
496 goto out;
497 ptr = ns->profile_ptr[profile];
498 if (!ptr && tomoyo_memory_ok(entry)) {
499 ptr = entry;
500 ptr->default_config = TOMOYO_CONFIG_DISABLED |
501 TOMOYO_CONFIG_WANT_GRANT_LOG |
502 TOMOYO_CONFIG_WANT_REJECT_LOG;
503 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
504 sizeof(ptr->config));
505 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
506 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
507 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
508 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
509 mb(); /* Avoid out-of-order execution. */
510 ns->profile_ptr[profile] = ptr;
511 entry = NULL;
512 }
513 mutex_unlock(&tomoyo_policy_lock);
514 out:
515 kfree(entry);
516 return ptr;
517 }
518
519 /**
520 * tomoyo_profile - Find a profile.
521 *
522 * @ns: Pointer to "struct tomoyo_policy_namespace".
523 * @profile: Profile number to find.
524 *
525 * Returns pointer to "struct tomoyo_profile".
526 */
527 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
528 const u8 profile)
529 {
530 static struct tomoyo_profile tomoyo_null_profile;
531 struct tomoyo_profile *ptr = ns->profile_ptr[profile];
532 if (!ptr)
533 ptr = &tomoyo_null_profile;
534 return ptr;
535 }
536
537 /**
538 * tomoyo_find_yesno - Find values for specified keyword.
539 *
540 * @string: String to check.
541 * @find: Name of keyword.
542 *
543 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
544 */
545 static s8 tomoyo_find_yesno(const char *string, const char *find)
546 {
547 const char *cp = strstr(string, find);
548 if (cp) {
549 cp += strlen(find);
550 if (!strncmp(cp, "=yes", 4))
551 return 1;
552 else if (!strncmp(cp, "=no", 3))
553 return 0;
554 }
555 return -1;
556 }
557
558 /**
559 * tomoyo_set_uint - Set value for specified preference.
560 *
561 * @i: Pointer to "unsigned int".
562 * @string: String to check.
563 * @find: Name of keyword.
564 *
565 * Returns nothing.
566 */
567 static void tomoyo_set_uint(unsigned int *i, const char *string,
568 const char *find)
569 {
570 const char *cp = strstr(string, find);
571 if (cp)
572 sscanf(cp + strlen(find), "=%u", i);
573 }
574
575 /**
576 * tomoyo_set_mode - Set mode for specified profile.
577 *
578 * @name: Name of functionality.
579 * @value: Mode for @name.
580 * @profile: Pointer to "struct tomoyo_profile".
581 *
582 * Returns 0 on success, negative value otherwise.
583 */
584 static int tomoyo_set_mode(char *name, const char *value,
585 struct tomoyo_profile *profile)
586 {
587 u8 i;
588 u8 config;
589 if (!strcmp(name, "CONFIG")) {
590 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
591 config = profile->default_config;
592 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
593 config = 0;
594 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
595 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
596 int len = 0;
597 if (i < TOMOYO_MAX_MAC_INDEX) {
598 const u8 c = tomoyo_index2category[i];
599 const char *category =
600 tomoyo_category_keywords[c];
601 len = strlen(category);
602 if (strncmp(name, category, len) ||
603 name[len++] != ':' || name[len++] != ':')
604 continue;
605 }
606 if (strcmp(name + len, tomoyo_mac_keywords[i]))
607 continue;
608 config = profile->config[i];
609 break;
610 }
611 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
612 return -EINVAL;
613 } else {
614 return -EINVAL;
615 }
616 if (strstr(value, "use_default")) {
617 config = TOMOYO_CONFIG_USE_DEFAULT;
618 } else {
619 u8 mode;
620 for (mode = 0; mode < 4; mode++)
621 if (strstr(value, tomoyo_mode[mode]))
622 /*
623 * Update lower 3 bits in order to distinguish
624 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
625 */
626 config = (config & ~7) | mode;
627 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
628 switch (tomoyo_find_yesno(value, "grant_log")) {
629 case 1:
630 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
631 break;
632 case 0:
633 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
634 break;
635 }
636 switch (tomoyo_find_yesno(value, "reject_log")) {
637 case 1:
638 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
639 break;
640 case 0:
641 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
642 break;
643 }
644 }
645 }
646 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
647 profile->config[i] = config;
648 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
649 profile->default_config = config;
650 return 0;
651 }
652
653 /**
654 * tomoyo_write_profile - Write profile table.
655 *
656 * @head: Pointer to "struct tomoyo_io_buffer".
657 *
658 * Returns 0 on success, negative value otherwise.
659 */
660 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
661 {
662 char *data = head->write_buf;
663 unsigned int i;
664 char *cp;
665 struct tomoyo_profile *profile;
666 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
667 == 1)
668 return 0;
669 i = simple_strtoul(data, &cp, 10);
670 if (*cp != '-')
671 return -EINVAL;
672 data = cp + 1;
673 profile = tomoyo_assign_profile(head->w.ns, i);
674 if (!profile)
675 return -EINVAL;
676 cp = strchr(data, '=');
677 if (!cp)
678 return -EINVAL;
679 *cp++ = '\0';
680 if (!strcmp(data, "COMMENT")) {
681 static DEFINE_SPINLOCK(lock);
682 const struct tomoyo_path_info *new_comment
683 = tomoyo_get_name(cp);
684 const struct tomoyo_path_info *old_comment;
685 if (!new_comment)
686 return -ENOMEM;
687 spin_lock(&lock);
688 old_comment = profile->comment;
689 profile->comment = new_comment;
690 spin_unlock(&lock);
691 tomoyo_put_name(old_comment);
692 return 0;
693 }
694 if (!strcmp(data, "PREFERENCE")) {
695 for (i = 0; i < TOMOYO_MAX_PREF; i++)
696 tomoyo_set_uint(&profile->pref[i], cp,
697 tomoyo_pref_keywords[i]);
698 return 0;
699 }
700 return tomoyo_set_mode(data, cp, profile);
701 }
702
703 /**
704 * tomoyo_print_config - Print mode for specified functionality.
705 *
706 * @head: Pointer to "struct tomoyo_io_buffer".
707 * @config: Mode for that functionality.
708 *
709 * Returns nothing.
710 *
711 * Caller prints functionality's name.
712 */
713 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
714 {
715 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
716 tomoyo_mode[config & 3],
717 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
718 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
719 }
720
721 /**
722 * tomoyo_read_profile - Read profile table.
723 *
724 * @head: Pointer to "struct tomoyo_io_buffer".
725 *
726 * Returns nothing.
727 */
728 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
729 {
730 u8 index;
731 struct tomoyo_policy_namespace *ns =
732 container_of(head->r.ns, typeof(*ns), namespace_list);
733 const struct tomoyo_profile *profile;
734 if (head->r.eof)
735 return;
736 next:
737 index = head->r.index;
738 profile = ns->profile_ptr[index];
739 switch (head->r.step) {
740 case 0:
741 tomoyo_print_namespace(head);
742 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
743 ns->profile_version);
744 head->r.step++;
745 break;
746 case 1:
747 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
748 head->r.index++)
749 if (ns->profile_ptr[head->r.index])
750 break;
751 if (head->r.index == TOMOYO_MAX_PROFILES) {
752 head->r.eof = true;
753 return;
754 }
755 head->r.step++;
756 break;
757 case 2:
758 {
759 u8 i;
760 const struct tomoyo_path_info *comment =
761 profile->comment;
762 tomoyo_print_namespace(head);
763 tomoyo_io_printf(head, "%u-COMMENT=", index);
764 tomoyo_set_string(head, comment ? comment->name : "");
765 tomoyo_set_lf(head);
766 tomoyo_print_namespace(head);
767 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
768 for (i = 0; i < TOMOYO_MAX_PREF; i++)
769 tomoyo_io_printf(head, "%s=%u ",
770 tomoyo_pref_keywords[i],
771 profile->pref[i]);
772 tomoyo_set_string(head, "}\n");
773 head->r.step++;
774 }
775 break;
776 case 3:
777 {
778 tomoyo_print_namespace(head);
779 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
780 tomoyo_print_config(head, profile->default_config);
781 head->r.bit = 0;
782 head->r.step++;
783 }
784 break;
785 case 4:
786 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
787 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
788 const u8 i = head->r.bit;
789 const u8 config = profile->config[i];
790 if (config == TOMOYO_CONFIG_USE_DEFAULT)
791 continue;
792 tomoyo_print_namespace(head);
793 if (i < TOMOYO_MAX_MAC_INDEX)
794 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
795 index,
796 tomoyo_category_keywords
797 [tomoyo_index2category[i]],
798 tomoyo_mac_keywords[i]);
799 else
800 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
801 tomoyo_mac_keywords[i]);
802 tomoyo_print_config(head, config);
803 head->r.bit++;
804 break;
805 }
806 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
807 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
808 head->r.index++;
809 head->r.step = 1;
810 }
811 break;
812 }
813 if (tomoyo_flush(head))
814 goto next;
815 }
816
817 /**
818 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
819 *
820 * @a: Pointer to "struct tomoyo_acl_head".
821 * @b: Pointer to "struct tomoyo_acl_head".
822 *
823 * Returns true if @a == @b, false otherwise.
824 */
825 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
826 const struct tomoyo_acl_head *b)
827 {
828 return container_of(a, struct tomoyo_manager, head)->manager ==
829 container_of(b, struct tomoyo_manager, head)->manager;
830 }
831
832 /**
833 * tomoyo_update_manager_entry - Add a manager entry.
834 *
835 * @manager: The path to manager or the domainnamme.
836 * @is_delete: True if it is a delete request.
837 *
838 * Returns 0 on success, negative value otherwise.
839 *
840 * Caller holds tomoyo_read_lock().
841 */
842 static int tomoyo_update_manager_entry(const char *manager,
843 const bool is_delete)
844 {
845 struct tomoyo_manager e = { };
846 struct tomoyo_acl_param param = {
847 /* .ns = &tomoyo_kernel_namespace, */
848 .is_delete = is_delete,
849 .list = &tomoyo_kernel_namespace.
850 policy_list[TOMOYO_ID_MANAGER],
851 };
852 int error = is_delete ? -ENOENT : -ENOMEM;
853 if (!tomoyo_correct_domain(manager) &&
854 !tomoyo_correct_word(manager))
855 return -EINVAL;
856 e.manager = tomoyo_get_name(manager);
857 if (e.manager) {
858 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
859 tomoyo_same_manager);
860 tomoyo_put_name(e.manager);
861 }
862 return error;
863 }
864
865 /**
866 * tomoyo_write_manager - Write manager policy.
867 *
868 * @head: Pointer to "struct tomoyo_io_buffer".
869 *
870 * Returns 0 on success, negative value otherwise.
871 *
872 * Caller holds tomoyo_read_lock().
873 */
874 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
875 {
876 char *data = head->write_buf;
877
878 if (!strcmp(data, "manage_by_non_root")) {
879 tomoyo_manage_by_non_root = !head->w.is_delete;
880 return 0;
881 }
882 return tomoyo_update_manager_entry(data, head->w.is_delete);
883 }
884
885 /**
886 * tomoyo_read_manager - Read manager policy.
887 *
888 * @head: Pointer to "struct tomoyo_io_buffer".
889 *
890 * Caller holds tomoyo_read_lock().
891 */
892 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
893 {
894 if (head->r.eof)
895 return;
896 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
897 policy_list[TOMOYO_ID_MANAGER]) {
898 struct tomoyo_manager *ptr =
899 list_entry(head->r.acl, typeof(*ptr), head.list);
900 if (ptr->head.is_deleted)
901 continue;
902 if (!tomoyo_flush(head))
903 return;
904 tomoyo_set_string(head, ptr->manager->name);
905 tomoyo_set_lf(head);
906 }
907 head->r.eof = true;
908 }
909
910 /**
911 * tomoyo_manager - Check whether the current process is a policy manager.
912 *
913 * Returns true if the current process is permitted to modify policy
914 * via /sys/kernel/security/tomoyo/ interface.
915 *
916 * Caller holds tomoyo_read_lock().
917 */
918 static bool tomoyo_manager(void)
919 {
920 struct tomoyo_manager *ptr;
921 const char *exe;
922 const struct task_struct *task = current;
923 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
924 bool found = false;
925
926 if (!tomoyo_policy_loaded)
927 return true;
928 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
929 return false;
930 exe = tomoyo_get_exe();
931 if (!exe)
932 return false;
933 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
934 policy_list[TOMOYO_ID_MANAGER], head.list) {
935 if (!ptr->head.is_deleted &&
936 (!tomoyo_pathcmp(domainname, ptr->manager) ||
937 !strcmp(exe, ptr->manager->name))) {
938 found = true;
939 break;
940 }
941 }
942 if (!found) { /* Reduce error messages. */
943 static pid_t last_pid;
944 const pid_t pid = current->pid;
945 if (last_pid != pid) {
946 printk(KERN_WARNING "%s ( %s ) is not permitted to "
947 "update policies.\n", domainname->name, exe);
948 last_pid = pid;
949 }
950 }
951 kfree(exe);
952 return found;
953 }
954
955 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
956 (unsigned int serial);
957
958 /**
959 * tomoyo_select_domain - Parse select command.
960 *
961 * @head: Pointer to "struct tomoyo_io_buffer".
962 * @data: String to parse.
963 *
964 * Returns true on success, false otherwise.
965 *
966 * Caller holds tomoyo_read_lock().
967 */
968 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
969 const char *data)
970 {
971 unsigned int pid;
972 struct tomoyo_domain_info *domain = NULL;
973 bool global_pid = false;
974 if (strncmp(data, "select ", 7))
975 return false;
976 data += 7;
977 if (sscanf(data, "pid=%u", &pid) == 1 ||
978 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
979 struct task_struct *p;
980 rcu_read_lock();
981 if (global_pid)
982 p = find_task_by_pid_ns(pid, &init_pid_ns);
983 else
984 p = find_task_by_vpid(pid);
985 if (p)
986 domain = tomoyo_real_domain(p);
987 rcu_read_unlock();
988 } else if (!strncmp(data, "domain=", 7)) {
989 if (tomoyo_domain_def(data + 7))
990 domain = tomoyo_find_domain(data + 7);
991 } else if (sscanf(data, "Q=%u", &pid) == 1) {
992 domain = tomoyo_find_domain_by_qid(pid);
993 } else
994 return false;
995 head->w.domain = domain;
996 /* Accessing read_buf is safe because head->io_sem is held. */
997 if (!head->read_buf)
998 return true; /* Do nothing if open(O_WRONLY). */
999 memset(&head->r, 0, sizeof(head->r));
1000 head->r.print_this_domain_only = true;
1001 if (domain)
1002 head->r.domain = &domain->list;
1003 else
1004 head->r.eof = 1;
1005 tomoyo_io_printf(head, "# select %s\n", data);
1006 if (domain && domain->is_deleted)
1007 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1008 return true;
1009 }
1010
1011 /**
1012 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1013 *
1014 * @a: Pointer to "struct tomoyo_acl_info".
1015 * @b: Pointer to "struct tomoyo_acl_info".
1016 *
1017 * Returns true if @a == @b, false otherwise.
1018 */
1019 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1020 const struct tomoyo_acl_info *b)
1021 {
1022 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1023 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1024 return p1->domainname == p2->domainname;
1025 }
1026
1027 /**
1028 * tomoyo_write_task - Update task related list.
1029 *
1030 * @param: Pointer to "struct tomoyo_acl_param".
1031 *
1032 * Returns 0 on success, negative value otherwise.
1033 *
1034 * Caller holds tomoyo_read_lock().
1035 */
1036 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1037 {
1038 int error = -EINVAL;
1039 if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1040 struct tomoyo_task_acl e = {
1041 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1042 .domainname = tomoyo_get_domainname(param),
1043 };
1044 if (e.domainname)
1045 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1046 tomoyo_same_task_acl,
1047 NULL);
1048 tomoyo_put_name(e.domainname);
1049 }
1050 return error;
1051 }
1052
1053 /**
1054 * tomoyo_delete_domain - Delete a domain.
1055 *
1056 * @domainname: The name of domain.
1057 *
1058 * Returns 0 on success, negative value otherwise.
1059 *
1060 * Caller holds tomoyo_read_lock().
1061 */
1062 static int tomoyo_delete_domain(char *domainname)
1063 {
1064 struct tomoyo_domain_info *domain;
1065 struct tomoyo_path_info name;
1066
1067 name.name = domainname;
1068 tomoyo_fill_path_info(&name);
1069 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1070 return -EINTR;
1071 /* Is there an active domain? */
1072 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1073 /* Never delete tomoyo_kernel_domain */
1074 if (domain == &tomoyo_kernel_domain)
1075 continue;
1076 if (domain->is_deleted ||
1077 tomoyo_pathcmp(domain->domainname, &name))
1078 continue;
1079 domain->is_deleted = true;
1080 break;
1081 }
1082 mutex_unlock(&tomoyo_policy_lock);
1083 return 0;
1084 }
1085
1086 /**
1087 * tomoyo_write_domain2 - Write domain policy.
1088 *
1089 * @ns: Pointer to "struct tomoyo_policy_namespace".
1090 * @list: Pointer to "struct list_head".
1091 * @data: Policy to be interpreted.
1092 * @is_delete: True if it is a delete request.
1093 *
1094 * Returns 0 on success, negative value otherwise.
1095 *
1096 * Caller holds tomoyo_read_lock().
1097 */
1098 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1099 struct list_head *list, char *data,
1100 const bool is_delete)
1101 {
1102 struct tomoyo_acl_param param = {
1103 .ns = ns,
1104 .list = list,
1105 .data = data,
1106 .is_delete = is_delete,
1107 };
1108 static const struct {
1109 const char *keyword;
1110 int (*write) (struct tomoyo_acl_param *);
1111 } tomoyo_callback[5] = {
1112 { "file ", tomoyo_write_file },
1113 { "network inet ", tomoyo_write_inet_network },
1114 { "network unix ", tomoyo_write_unix_network },
1115 { "misc ", tomoyo_write_misc },
1116 { "task ", tomoyo_write_task },
1117 };
1118 u8 i;
1119
1120 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1121 if (!tomoyo_str_starts(&param.data,
1122 tomoyo_callback[i].keyword))
1123 continue;
1124 return tomoyo_callback[i].write(&param);
1125 }
1126 return -EINVAL;
1127 }
1128
1129 /* String table for domain flags. */
1130 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1131 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1132 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1133 };
1134
1135 /**
1136 * tomoyo_write_domain - Write domain policy.
1137 *
1138 * @head: Pointer to "struct tomoyo_io_buffer".
1139 *
1140 * Returns 0 on success, negative value otherwise.
1141 *
1142 * Caller holds tomoyo_read_lock().
1143 */
1144 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1145 {
1146 char *data = head->write_buf;
1147 struct tomoyo_policy_namespace *ns;
1148 struct tomoyo_domain_info *domain = head->w.domain;
1149 const bool is_delete = head->w.is_delete;
1150 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1151 unsigned int profile;
1152 if (*data == '<') {
1153 int ret = 0;
1154 domain = NULL;
1155 if (is_delete)
1156 ret = tomoyo_delete_domain(data);
1157 else if (is_select)
1158 domain = tomoyo_find_domain(data);
1159 else
1160 domain = tomoyo_assign_domain(data, false);
1161 head->w.domain = domain;
1162 return ret;
1163 }
1164 if (!domain)
1165 return -EINVAL;
1166 ns = domain->ns;
1167 if (sscanf(data, "use_profile %u", &profile) == 1
1168 && profile < TOMOYO_MAX_PROFILES) {
1169 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1170 domain->profile = (u8) profile;
1171 return 0;
1172 }
1173 if (sscanf(data, "use_group %u\n", &profile) == 1
1174 && profile < TOMOYO_MAX_ACL_GROUPS) {
1175 if (!is_delete)
1176 domain->group = (u8) profile;
1177 return 0;
1178 }
1179 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1180 const char *cp = tomoyo_dif[profile];
1181 if (strncmp(data, cp, strlen(cp) - 1))
1182 continue;
1183 domain->flags[profile] = !is_delete;
1184 return 0;
1185 }
1186 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1187 is_delete);
1188 }
1189
1190 /**
1191 * tomoyo_print_condition - Print condition part.
1192 *
1193 * @head: Pointer to "struct tomoyo_io_buffer".
1194 * @cond: Pointer to "struct tomoyo_condition".
1195 *
1196 * Returns true on success, false otherwise.
1197 */
1198 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1199 const struct tomoyo_condition *cond)
1200 {
1201 switch (head->r.cond_step) {
1202 case 0:
1203 head->r.cond_index = 0;
1204 head->r.cond_step++;
1205 if (cond->transit) {
1206 tomoyo_set_space(head);
1207 tomoyo_set_string(head, cond->transit->name);
1208 }
1209 /* fall through */
1210 case 1:
1211 {
1212 const u16 condc = cond->condc;
1213 const struct tomoyo_condition_element *condp =
1214 (typeof(condp)) (cond + 1);
1215 const struct tomoyo_number_union *numbers_p =
1216 (typeof(numbers_p)) (condp + condc);
1217 const struct tomoyo_name_union *names_p =
1218 (typeof(names_p))
1219 (numbers_p + cond->numbers_count);
1220 const struct tomoyo_argv *argv =
1221 (typeof(argv)) (names_p + cond->names_count);
1222 const struct tomoyo_envp *envp =
1223 (typeof(envp)) (argv + cond->argc);
1224 u16 skip;
1225 for (skip = 0; skip < head->r.cond_index; skip++) {
1226 const u8 left = condp->left;
1227 const u8 right = condp->right;
1228 condp++;
1229 switch (left) {
1230 case TOMOYO_ARGV_ENTRY:
1231 argv++;
1232 continue;
1233 case TOMOYO_ENVP_ENTRY:
1234 envp++;
1235 continue;
1236 case TOMOYO_NUMBER_UNION:
1237 numbers_p++;
1238 break;
1239 }
1240 switch (right) {
1241 case TOMOYO_NAME_UNION:
1242 names_p++;
1243 break;
1244 case TOMOYO_NUMBER_UNION:
1245 numbers_p++;
1246 break;
1247 }
1248 }
1249 while (head->r.cond_index < condc) {
1250 const u8 match = condp->equals;
1251 const u8 left = condp->left;
1252 const u8 right = condp->right;
1253 if (!tomoyo_flush(head))
1254 return false;
1255 condp++;
1256 head->r.cond_index++;
1257 tomoyo_set_space(head);
1258 switch (left) {
1259 case TOMOYO_ARGV_ENTRY:
1260 tomoyo_io_printf(head,
1261 "exec.argv[%lu]%s=\"",
1262 argv->index, argv->
1263 is_not ? "!" : "");
1264 tomoyo_set_string(head,
1265 argv->value->name);
1266 tomoyo_set_string(head, "\"");
1267 argv++;
1268 continue;
1269 case TOMOYO_ENVP_ENTRY:
1270 tomoyo_set_string(head,
1271 "exec.envp[\"");
1272 tomoyo_set_string(head,
1273 envp->name->name);
1274 tomoyo_io_printf(head, "\"]%s=", envp->
1275 is_not ? "!" : "");
1276 if (envp->value) {
1277 tomoyo_set_string(head, "\"");
1278 tomoyo_set_string(head, envp->
1279 value->name);
1280 tomoyo_set_string(head, "\"");
1281 } else {
1282 tomoyo_set_string(head,
1283 "NULL");
1284 }
1285 envp++;
1286 continue;
1287 case TOMOYO_NUMBER_UNION:
1288 tomoyo_print_number_union_nospace
1289 (head, numbers_p++);
1290 break;
1291 default:
1292 tomoyo_set_string(head,
1293 tomoyo_condition_keyword[left]);
1294 break;
1295 }
1296 tomoyo_set_string(head, match ? "=" : "!=");
1297 switch (right) {
1298 case TOMOYO_NAME_UNION:
1299 tomoyo_print_name_union_quoted
1300 (head, names_p++);
1301 break;
1302 case TOMOYO_NUMBER_UNION:
1303 tomoyo_print_number_union_nospace
1304 (head, numbers_p++);
1305 break;
1306 default:
1307 tomoyo_set_string(head,
1308 tomoyo_condition_keyword[right]);
1309 break;
1310 }
1311 }
1312 }
1313 head->r.cond_step++;
1314 /* fall through */
1315 case 2:
1316 if (!tomoyo_flush(head))
1317 break;
1318 head->r.cond_step++;
1319 /* fall through */
1320 case 3:
1321 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1322 tomoyo_io_printf(head, " grant_log=%s",
1323 tomoyo_yesno(cond->grant_log ==
1324 TOMOYO_GRANTLOG_YES));
1325 tomoyo_set_lf(head);
1326 return true;
1327 }
1328 return false;
1329 }
1330
1331 /**
1332 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1333 *
1334 * @head: Pointer to "struct tomoyo_io_buffer".
1335 * @category: Category name.
1336 *
1337 * Returns nothing.
1338 */
1339 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1340 const char *category)
1341 {
1342 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1343 tomoyo_print_namespace(head);
1344 tomoyo_io_printf(head, "acl_group %u ",
1345 head->r.acl_group_index);
1346 }
1347 tomoyo_set_string(head, category);
1348 }
1349
1350 /**
1351 * tomoyo_print_entry - Print an ACL entry.
1352 *
1353 * @head: Pointer to "struct tomoyo_io_buffer".
1354 * @acl: Pointer to an ACL entry.
1355 *
1356 * Returns true on success, false otherwise.
1357 */
1358 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1359 struct tomoyo_acl_info *acl)
1360 {
1361 const u8 acl_type = acl->type;
1362 bool first = true;
1363 u8 bit;
1364
1365 if (head->r.print_cond_part)
1366 goto print_cond_part;
1367 if (acl->is_deleted)
1368 return true;
1369 if (!tomoyo_flush(head))
1370 return false;
1371 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1372 struct tomoyo_path_acl *ptr =
1373 container_of(acl, typeof(*ptr), head);
1374 const u16 perm = ptr->perm;
1375 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1376 if (!(perm & (1 << bit)))
1377 continue;
1378 if (head->r.print_transition_related_only &&
1379 bit != TOMOYO_TYPE_EXECUTE)
1380 continue;
1381 if (first) {
1382 tomoyo_set_group(head, "file ");
1383 first = false;
1384 } else {
1385 tomoyo_set_slash(head);
1386 }
1387 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1388 }
1389 if (first)
1390 return true;
1391 tomoyo_print_name_union(head, &ptr->name);
1392 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1393 struct tomoyo_task_acl *ptr =
1394 container_of(acl, typeof(*ptr), head);
1395 tomoyo_set_group(head, "task ");
1396 tomoyo_set_string(head, "manual_domain_transition ");
1397 tomoyo_set_string(head, ptr->domainname->name);
1398 } else if (head->r.print_transition_related_only) {
1399 return true;
1400 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1401 struct tomoyo_path2_acl *ptr =
1402 container_of(acl, typeof(*ptr), head);
1403 const u8 perm = ptr->perm;
1404 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1405 if (!(perm & (1 << bit)))
1406 continue;
1407 if (first) {
1408 tomoyo_set_group(head, "file ");
1409 first = false;
1410 } else {
1411 tomoyo_set_slash(head);
1412 }
1413 tomoyo_set_string(head, tomoyo_mac_keywords
1414 [tomoyo_pp2mac[bit]]);
1415 }
1416 if (first)
1417 return true;
1418 tomoyo_print_name_union(head, &ptr->name1);
1419 tomoyo_print_name_union(head, &ptr->name2);
1420 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1421 struct tomoyo_path_number_acl *ptr =
1422 container_of(acl, typeof(*ptr), head);
1423 const u8 perm = ptr->perm;
1424 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1425 if (!(perm & (1 << bit)))
1426 continue;
1427 if (first) {
1428 tomoyo_set_group(head, "file ");
1429 first = false;
1430 } else {
1431 tomoyo_set_slash(head);
1432 }
1433 tomoyo_set_string(head, tomoyo_mac_keywords
1434 [tomoyo_pn2mac[bit]]);
1435 }
1436 if (first)
1437 return true;
1438 tomoyo_print_name_union(head, &ptr->name);
1439 tomoyo_print_number_union(head, &ptr->number);
1440 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1441 struct tomoyo_mkdev_acl *ptr =
1442 container_of(acl, typeof(*ptr), head);
1443 const u8 perm = ptr->perm;
1444 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1445 if (!(perm & (1 << bit)))
1446 continue;
1447 if (first) {
1448 tomoyo_set_group(head, "file ");
1449 first = false;
1450 } else {
1451 tomoyo_set_slash(head);
1452 }
1453 tomoyo_set_string(head, tomoyo_mac_keywords
1454 [tomoyo_pnnn2mac[bit]]);
1455 }
1456 if (first)
1457 return true;
1458 tomoyo_print_name_union(head, &ptr->name);
1459 tomoyo_print_number_union(head, &ptr->mode);
1460 tomoyo_print_number_union(head, &ptr->major);
1461 tomoyo_print_number_union(head, &ptr->minor);
1462 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1463 struct tomoyo_inet_acl *ptr =
1464 container_of(acl, typeof(*ptr), head);
1465 const u8 perm = ptr->perm;
1466
1467 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1468 if (!(perm & (1 << bit)))
1469 continue;
1470 if (first) {
1471 tomoyo_set_group(head, "network inet ");
1472 tomoyo_set_string(head, tomoyo_proto_keyword
1473 [ptr->protocol]);
1474 tomoyo_set_space(head);
1475 first = false;
1476 } else {
1477 tomoyo_set_slash(head);
1478 }
1479 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1480 }
1481 if (first)
1482 return true;
1483 tomoyo_set_space(head);
1484 if (ptr->address.group) {
1485 tomoyo_set_string(head, "@");
1486 tomoyo_set_string(head, ptr->address.group->group_name
1487 ->name);
1488 } else {
1489 char buf[128];
1490 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1491 tomoyo_io_printf(head, "%s", buf);
1492 }
1493 tomoyo_print_number_union(head, &ptr->port);
1494 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1495 struct tomoyo_unix_acl *ptr =
1496 container_of(acl, typeof(*ptr), head);
1497 const u8 perm = ptr->perm;
1498
1499 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1500 if (!(perm & (1 << bit)))
1501 continue;
1502 if (first) {
1503 tomoyo_set_group(head, "network unix ");
1504 tomoyo_set_string(head, tomoyo_proto_keyword
1505 [ptr->protocol]);
1506 tomoyo_set_space(head);
1507 first = false;
1508 } else {
1509 tomoyo_set_slash(head);
1510 }
1511 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1512 }
1513 if (first)
1514 return true;
1515 tomoyo_print_name_union(head, &ptr->name);
1516 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1517 struct tomoyo_mount_acl *ptr =
1518 container_of(acl, typeof(*ptr), head);
1519 tomoyo_set_group(head, "file mount");
1520 tomoyo_print_name_union(head, &ptr->dev_name);
1521 tomoyo_print_name_union(head, &ptr->dir_name);
1522 tomoyo_print_name_union(head, &ptr->fs_type);
1523 tomoyo_print_number_union(head, &ptr->flags);
1524 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1525 struct tomoyo_env_acl *ptr =
1526 container_of(acl, typeof(*ptr), head);
1527
1528 tomoyo_set_group(head, "misc env ");
1529 tomoyo_set_string(head, ptr->env->name);
1530 }
1531 if (acl->cond) {
1532 head->r.print_cond_part = true;
1533 head->r.cond_step = 0;
1534 if (!tomoyo_flush(head))
1535 return false;
1536 print_cond_part:
1537 if (!tomoyo_print_condition(head, acl->cond))
1538 return false;
1539 head->r.print_cond_part = false;
1540 } else {
1541 tomoyo_set_lf(head);
1542 }
1543 return true;
1544 }
1545
1546 /**
1547 * tomoyo_read_domain2 - Read domain policy.
1548 *
1549 * @head: Pointer to "struct tomoyo_io_buffer".
1550 * @list: Pointer to "struct list_head".
1551 *
1552 * Caller holds tomoyo_read_lock().
1553 *
1554 * Returns true on success, false otherwise.
1555 */
1556 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1557 struct list_head *list)
1558 {
1559 list_for_each_cookie(head->r.acl, list) {
1560 struct tomoyo_acl_info *ptr =
1561 list_entry(head->r.acl, typeof(*ptr), list);
1562 if (!tomoyo_print_entry(head, ptr))
1563 return false;
1564 }
1565 head->r.acl = NULL;
1566 return true;
1567 }
1568
1569 /**
1570 * tomoyo_read_domain - Read domain policy.
1571 *
1572 * @head: Pointer to "struct tomoyo_io_buffer".
1573 *
1574 * Caller holds tomoyo_read_lock().
1575 */
1576 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1577 {
1578 if (head->r.eof)
1579 return;
1580 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1581 struct tomoyo_domain_info *domain =
1582 list_entry(head->r.domain, typeof(*domain), list);
1583 switch (head->r.step) {
1584 u8 i;
1585 case 0:
1586 if (domain->is_deleted &&
1587 !head->r.print_this_domain_only)
1588 continue;
1589 /* Print domainname and flags. */
1590 tomoyo_set_string(head, domain->domainname->name);
1591 tomoyo_set_lf(head);
1592 tomoyo_io_printf(head, "use_profile %u\n",
1593 domain->profile);
1594 tomoyo_io_printf(head, "use_group %u\n",
1595 domain->group);
1596 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1597 if (domain->flags[i])
1598 tomoyo_set_string(head, tomoyo_dif[i]);
1599 head->r.step++;
1600 tomoyo_set_lf(head);
1601 /* fall through */
1602 case 1:
1603 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1604 return;
1605 head->r.step++;
1606 if (!tomoyo_set_lf(head))
1607 return;
1608 /* fall through */
1609 case 2:
1610 head->r.step = 0;
1611 if (head->r.print_this_domain_only)
1612 goto done;
1613 }
1614 }
1615 done:
1616 head->r.eof = true;
1617 }
1618
1619 /**
1620 * tomoyo_write_pid: Specify PID to obtain domainname.
1621 *
1622 * @head: Pointer to "struct tomoyo_io_buffer".
1623 *
1624 * Returns 0.
1625 */
1626 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1627 {
1628 head->r.eof = false;
1629 return 0;
1630 }
1631
1632 /**
1633 * tomoyo_read_pid - Get domainname of the specified PID.
1634 *
1635 * @head: Pointer to "struct tomoyo_io_buffer".
1636 *
1637 * Returns the domainname which the specified PID is in on success,
1638 * empty string otherwise.
1639 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1640 * using read()/write() interface rather than sysctl() interface.
1641 */
1642 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1643 {
1644 char *buf = head->write_buf;
1645 bool global_pid = false;
1646 unsigned int pid;
1647 struct task_struct *p;
1648 struct tomoyo_domain_info *domain = NULL;
1649
1650 /* Accessing write_buf is safe because head->io_sem is held. */
1651 if (!buf) {
1652 head->r.eof = true;
1653 return; /* Do nothing if open(O_RDONLY). */
1654 }
1655 if (head->r.w_pos || head->r.eof)
1656 return;
1657 head->r.eof = true;
1658 if (tomoyo_str_starts(&buf, "global-pid "))
1659 global_pid = true;
1660 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1661 rcu_read_lock();
1662 if (global_pid)
1663 p = find_task_by_pid_ns(pid, &init_pid_ns);
1664 else
1665 p = find_task_by_vpid(pid);
1666 if (p)
1667 domain = tomoyo_real_domain(p);
1668 rcu_read_unlock();
1669 if (!domain)
1670 return;
1671 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1672 tomoyo_set_string(head, domain->domainname->name);
1673 }
1674
1675 /* String table for domain transition control keywords. */
1676 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1677 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1678 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1679 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1680 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1681 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1682 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1683 };
1684
1685 /* String table for grouping keywords. */
1686 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1687 [TOMOYO_PATH_GROUP] = "path_group ",
1688 [TOMOYO_NUMBER_GROUP] = "number_group ",
1689 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1690 };
1691
1692 /**
1693 * tomoyo_write_exception - Write exception policy.
1694 *
1695 * @head: Pointer to "struct tomoyo_io_buffer".
1696 *
1697 * Returns 0 on success, negative value otherwise.
1698 *
1699 * Caller holds tomoyo_read_lock().
1700 */
1701 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1702 {
1703 const bool is_delete = head->w.is_delete;
1704 struct tomoyo_acl_param param = {
1705 .ns = head->w.ns,
1706 .is_delete = is_delete,
1707 .data = head->write_buf,
1708 };
1709 u8 i;
1710 if (tomoyo_str_starts(&param.data, "aggregator "))
1711 return tomoyo_write_aggregator(&param);
1712 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1713 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1714 return tomoyo_write_transition_control(&param, i);
1715 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1716 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1717 return tomoyo_write_group(&param, i);
1718 if (tomoyo_str_starts(&param.data, "acl_group ")) {
1719 unsigned int group;
1720 char *data;
1721 group = simple_strtoul(param.data, &data, 10);
1722 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1723 return tomoyo_write_domain2
1724 (head->w.ns, &head->w.ns->acl_group[group],
1725 data, is_delete);
1726 }
1727 return -EINVAL;
1728 }
1729
1730 /**
1731 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1732 *
1733 * @head: Pointer to "struct tomoyo_io_buffer".
1734 * @idx: Index number.
1735 *
1736 * Returns true on success, false otherwise.
1737 *
1738 * Caller holds tomoyo_read_lock().
1739 */
1740 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1741 {
1742 struct tomoyo_policy_namespace *ns =
1743 container_of(head->r.ns, typeof(*ns), namespace_list);
1744 struct list_head *list = &ns->group_list[idx];
1745 list_for_each_cookie(head->r.group, list) {
1746 struct tomoyo_group *group =
1747 list_entry(head->r.group, typeof(*group), head.list);
1748 list_for_each_cookie(head->r.acl, &group->member_list) {
1749 struct tomoyo_acl_head *ptr =
1750 list_entry(head->r.acl, typeof(*ptr), list);
1751 if (ptr->is_deleted)
1752 continue;
1753 if (!tomoyo_flush(head))
1754 return false;
1755 tomoyo_print_namespace(head);
1756 tomoyo_set_string(head, tomoyo_group_name[idx]);
1757 tomoyo_set_string(head, group->group_name->name);
1758 if (idx == TOMOYO_PATH_GROUP) {
1759 tomoyo_set_space(head);
1760 tomoyo_set_string(head, container_of
1761 (ptr, struct tomoyo_path_group,
1762 head)->member_name->name);
1763 } else if (idx == TOMOYO_NUMBER_GROUP) {
1764 tomoyo_print_number_union(head, &container_of
1765 (ptr,
1766 struct tomoyo_number_group,
1767 head)->number);
1768 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1769 char buffer[128];
1770
1771 struct tomoyo_address_group *member =
1772 container_of(ptr, typeof(*member),
1773 head);
1774 tomoyo_print_ip(buffer, sizeof(buffer),
1775 &member->address);
1776 tomoyo_io_printf(head, " %s", buffer);
1777 }
1778 tomoyo_set_lf(head);
1779 }
1780 head->r.acl = NULL;
1781 }
1782 head->r.group = NULL;
1783 return true;
1784 }
1785
1786 /**
1787 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1788 *
1789 * @head: Pointer to "struct tomoyo_io_buffer".
1790 * @idx: Index number.
1791 *
1792 * Returns true on success, false otherwise.
1793 *
1794 * Caller holds tomoyo_read_lock().
1795 */
1796 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1797 {
1798 struct tomoyo_policy_namespace *ns =
1799 container_of(head->r.ns, typeof(*ns), namespace_list);
1800 struct list_head *list = &ns->policy_list[idx];
1801 list_for_each_cookie(head->r.acl, list) {
1802 struct tomoyo_acl_head *acl =
1803 container_of(head->r.acl, typeof(*acl), list);
1804 if (acl->is_deleted)
1805 continue;
1806 if (!tomoyo_flush(head))
1807 return false;
1808 switch (idx) {
1809 case TOMOYO_ID_TRANSITION_CONTROL:
1810 {
1811 struct tomoyo_transition_control *ptr =
1812 container_of(acl, typeof(*ptr), head);
1813 tomoyo_print_namespace(head);
1814 tomoyo_set_string(head, tomoyo_transition_type
1815 [ptr->type]);
1816 tomoyo_set_string(head, ptr->program ?
1817 ptr->program->name : "any");
1818 tomoyo_set_string(head, " from ");
1819 tomoyo_set_string(head, ptr->domainname ?
1820 ptr->domainname->name :
1821 "any");
1822 }
1823 break;
1824 case TOMOYO_ID_AGGREGATOR:
1825 {
1826 struct tomoyo_aggregator *ptr =
1827 container_of(acl, typeof(*ptr), head);
1828 tomoyo_print_namespace(head);
1829 tomoyo_set_string(head, "aggregator ");
1830 tomoyo_set_string(head,
1831 ptr->original_name->name);
1832 tomoyo_set_space(head);
1833 tomoyo_set_string(head,
1834 ptr->aggregated_name->name);
1835 }
1836 break;
1837 default:
1838 continue;
1839 }
1840 tomoyo_set_lf(head);
1841 }
1842 head->r.acl = NULL;
1843 return true;
1844 }
1845
1846 /**
1847 * tomoyo_read_exception - Read exception policy.
1848 *
1849 * @head: Pointer to "struct tomoyo_io_buffer".
1850 *
1851 * Caller holds tomoyo_read_lock().
1852 */
1853 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1854 {
1855 struct tomoyo_policy_namespace *ns =
1856 container_of(head->r.ns, typeof(*ns), namespace_list);
1857 if (head->r.eof)
1858 return;
1859 while (head->r.step < TOMOYO_MAX_POLICY &&
1860 tomoyo_read_policy(head, head->r.step))
1861 head->r.step++;
1862 if (head->r.step < TOMOYO_MAX_POLICY)
1863 return;
1864 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1865 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1866 head->r.step++;
1867 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1868 return;
1869 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1870 + TOMOYO_MAX_ACL_GROUPS) {
1871 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1872 - TOMOYO_MAX_GROUP;
1873 if (!tomoyo_read_domain2(head, &ns->acl_group
1874 [head->r.acl_group_index]))
1875 return;
1876 head->r.step++;
1877 }
1878 head->r.eof = true;
1879 }
1880
1881 /* Wait queue for kernel -> userspace notification. */
1882 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1883 /* Wait queue for userspace -> kernel notification. */
1884 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1885
1886 /* Structure for query. */
1887 struct tomoyo_query {
1888 struct list_head list;
1889 struct tomoyo_domain_info *domain;
1890 char *query;
1891 size_t query_len;
1892 unsigned int serial;
1893 u8 timer;
1894 u8 answer;
1895 u8 retry;
1896 };
1897
1898 /* The list for "struct tomoyo_query". */
1899 static LIST_HEAD(tomoyo_query_list);
1900
1901 /* Lock for manipulating tomoyo_query_list. */
1902 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1903
1904 /*
1905 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1906 * interface.
1907 */
1908 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1909
1910 /**
1911 * tomoyo_truncate - Truncate a line.
1912 *
1913 * @str: String to truncate.
1914 *
1915 * Returns length of truncated @str.
1916 */
1917 static int tomoyo_truncate(char *str)
1918 {
1919 char *start = str;
1920 while (*(unsigned char *) str > (unsigned char) ' ')
1921 str++;
1922 *str = '\0';
1923 return strlen(start) + 1;
1924 }
1925
1926 /**
1927 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1928 *
1929 * @domain: Pointer to "struct tomoyo_domain_info".
1930 * @header: Lines containing ACL.
1931 *
1932 * Returns nothing.
1933 */
1934 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1935 {
1936 char *buffer;
1937 char *realpath = NULL;
1938 char *argv0 = NULL;
1939 char *symlink = NULL;
1940 char *cp = strchr(header, '\n');
1941 int len;
1942 if (!cp)
1943 return;
1944 cp = strchr(cp + 1, '\n');
1945 if (!cp)
1946 return;
1947 *cp++ = '\0';
1948 len = strlen(cp) + 1;
1949 /* strstr() will return NULL if ordering is wrong. */
1950 if (*cp == 'f') {
1951 argv0 = strstr(header, " argv[]={ \"");
1952 if (argv0) {
1953 argv0 += 10;
1954 len += tomoyo_truncate(argv0) + 14;
1955 }
1956 realpath = strstr(header, " exec={ realpath=\"");
1957 if (realpath) {
1958 realpath += 8;
1959 len += tomoyo_truncate(realpath) + 6;
1960 }
1961 symlink = strstr(header, " symlink.target=\"");
1962 if (symlink)
1963 len += tomoyo_truncate(symlink + 1) + 1;
1964 }
1965 buffer = kmalloc(len, GFP_NOFS);
1966 if (!buffer)
1967 return;
1968 snprintf(buffer, len - 1, "%s", cp);
1969 if (realpath)
1970 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1971 if (argv0)
1972 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1973 if (symlink)
1974 tomoyo_addprintf(buffer, len, "%s", symlink);
1975 tomoyo_normalize_line(buffer);
1976 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1977 false))
1978 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1979 kfree(buffer);
1980 }
1981
1982 /**
1983 * tomoyo_supervisor - Ask for the supervisor's decision.
1984 *
1985 * @r: Pointer to "struct tomoyo_request_info".
1986 * @fmt: The printf()'s format string, followed by parameters.
1987 *
1988 * Returns 0 if the supervisor decided to permit the access request which
1989 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1990 * supervisor decided to retry the access request which violated the policy in
1991 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1992 */
1993 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1994 {
1995 va_list args;
1996 int error;
1997 int len;
1998 static unsigned int tomoyo_serial;
1999 struct tomoyo_query entry = { };
2000 bool quota_exceeded = false;
2001 va_start(args, fmt);
2002 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2003 va_end(args);
2004 /* Write /sys/kernel/security/tomoyo/audit. */
2005 va_start(args, fmt);
2006 tomoyo_write_log2(r, len, fmt, args);
2007 va_end(args);
2008 /* Nothing more to do if granted. */
2009 if (r->granted)
2010 return 0;
2011 if (r->mode)
2012 tomoyo_update_stat(r->mode);
2013 switch (r->mode) {
2014 case TOMOYO_CONFIG_ENFORCING:
2015 error = -EPERM;
2016 if (atomic_read(&tomoyo_query_observers))
2017 break;
2018 goto out;
2019 case TOMOYO_CONFIG_LEARNING:
2020 error = 0;
2021 /* Check max_learning_entry parameter. */
2022 if (tomoyo_domain_quota_is_ok(r))
2023 break;
2024 /* fall through */
2025 default:
2026 return 0;
2027 }
2028 /* Get message. */
2029 va_start(args, fmt);
2030 entry.query = tomoyo_init_log(r, len, fmt, args);
2031 va_end(args);
2032 if (!entry.query)
2033 goto out;
2034 entry.query_len = strlen(entry.query) + 1;
2035 if (!error) {
2036 tomoyo_add_entry(r->domain, entry.query);
2037 goto out;
2038 }
2039 len = tomoyo_round2(entry.query_len);
2040 entry.domain = r->domain;
2041 spin_lock(&tomoyo_query_list_lock);
2042 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2043 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2044 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2045 quota_exceeded = true;
2046 } else {
2047 entry.serial = tomoyo_serial++;
2048 entry.retry = r->retry;
2049 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2050 list_add_tail(&entry.list, &tomoyo_query_list);
2051 }
2052 spin_unlock(&tomoyo_query_list_lock);
2053 if (quota_exceeded)
2054 goto out;
2055 /* Give 10 seconds for supervisor's opinion. */
2056 while (entry.timer < 10) {
2057 wake_up_all(&tomoyo_query_wait);
2058 if (wait_event_interruptible_timeout
2059 (tomoyo_answer_wait, entry.answer ||
2060 !atomic_read(&tomoyo_query_observers), HZ))
2061 break;
2062 else
2063 entry.timer++;
2064 }
2065 spin_lock(&tomoyo_query_list_lock);
2066 list_del(&entry.list);
2067 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2068 spin_unlock(&tomoyo_query_list_lock);
2069 switch (entry.answer) {
2070 case 3: /* Asked to retry by administrator. */
2071 error = TOMOYO_RETRY_REQUEST;
2072 r->retry++;
2073 break;
2074 case 1:
2075 /* Granted by administrator. */
2076 error = 0;
2077 break;
2078 default:
2079 /* Timed out or rejected by administrator. */
2080 break;
2081 }
2082 out:
2083 kfree(entry.query);
2084 return error;
2085 }
2086
2087 /**
2088 * tomoyo_find_domain_by_qid - Get domain by query id.
2089 *
2090 * @serial: Query ID assigned by tomoyo_supervisor().
2091 *
2092 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2093 */
2094 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2095 (unsigned int serial)
2096 {
2097 struct tomoyo_query *ptr;
2098 struct tomoyo_domain_info *domain = NULL;
2099 spin_lock(&tomoyo_query_list_lock);
2100 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2101 if (ptr->serial != serial)
2102 continue;
2103 domain = ptr->domain;
2104 break;
2105 }
2106 spin_unlock(&tomoyo_query_list_lock);
2107 return domain;
2108 }
2109
2110 /**
2111 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2112 *
2113 * @file: Pointer to "struct file".
2114 * @wait: Pointer to "poll_table".
2115 *
2116 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2117 *
2118 * Waits for access requests which violated policy in enforcing mode.
2119 */
2120 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2121 {
2122 if (!list_empty(&tomoyo_query_list))
2123 return POLLIN | POLLRDNORM;
2124 poll_wait(file, &tomoyo_query_wait, wait);
2125 if (!list_empty(&tomoyo_query_list))
2126 return POLLIN | POLLRDNORM;
2127 return 0;
2128 }
2129
2130 /**
2131 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2132 *
2133 * @head: Pointer to "struct tomoyo_io_buffer".
2134 */
2135 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2136 {
2137 struct list_head *tmp;
2138 unsigned int pos = 0;
2139 size_t len = 0;
2140 char *buf;
2141 if (head->r.w_pos)
2142 return;
2143 if (head->read_buf) {
2144 kfree(head->read_buf);
2145 head->read_buf = NULL;
2146 }
2147 spin_lock(&tomoyo_query_list_lock);
2148 list_for_each(tmp, &tomoyo_query_list) {
2149 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2150 if (pos++ != head->r.query_index)
2151 continue;
2152 len = ptr->query_len;
2153 break;
2154 }
2155 spin_unlock(&tomoyo_query_list_lock);
2156 if (!len) {
2157 head->r.query_index = 0;
2158 return;
2159 }
2160 buf = kzalloc(len + 32, GFP_NOFS);
2161 if (!buf)
2162 return;
2163 pos = 0;
2164 spin_lock(&tomoyo_query_list_lock);
2165 list_for_each(tmp, &tomoyo_query_list) {
2166 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2167 if (pos++ != head->r.query_index)
2168 continue;
2169 /*
2170 * Some query can be skipped because tomoyo_query_list
2171 * can change, but I don't care.
2172 */
2173 if (len == ptr->query_len)
2174 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2175 ptr->retry, ptr->query);
2176 break;
2177 }
2178 spin_unlock(&tomoyo_query_list_lock);
2179 if (buf[0]) {
2180 head->read_buf = buf;
2181 head->r.w[head->r.w_pos++] = buf;
2182 head->r.query_index++;
2183 } else {
2184 kfree(buf);
2185 }
2186 }
2187
2188 /**
2189 * tomoyo_write_answer - Write the supervisor's decision.
2190 *
2191 * @head: Pointer to "struct tomoyo_io_buffer".
2192 *
2193 * Returns 0 on success, -EINVAL otherwise.
2194 */
2195 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2196 {
2197 char *data = head->write_buf;
2198 struct list_head *tmp;
2199 unsigned int serial;
2200 unsigned int answer;
2201 spin_lock(&tomoyo_query_list_lock);
2202 list_for_each(tmp, &tomoyo_query_list) {
2203 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2204 ptr->timer = 0;
2205 }
2206 spin_unlock(&tomoyo_query_list_lock);
2207 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2208 return -EINVAL;
2209 spin_lock(&tomoyo_query_list_lock);
2210 list_for_each(tmp, &tomoyo_query_list) {
2211 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2212 if (ptr->serial != serial)
2213 continue;
2214 ptr->answer = answer;
2215 /* Remove from tomoyo_query_list. */
2216 if (ptr->answer)
2217 list_del_init(&ptr->list);
2218 break;
2219 }
2220 spin_unlock(&tomoyo_query_list_lock);
2221 return 0;
2222 }
2223
2224 /**
2225 * tomoyo_read_version: Get version.
2226 *
2227 * @head: Pointer to "struct tomoyo_io_buffer".
2228 *
2229 * Returns version information.
2230 */
2231 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2232 {
2233 if (!head->r.eof) {
2234 tomoyo_io_printf(head, "2.5.0");
2235 head->r.eof = true;
2236 }
2237 }
2238
2239 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2240 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2241 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2242 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2243 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2244 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2245 };
2246
2247 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2248 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2249 [TOMOYO_MEMORY_POLICY] = "policy:",
2250 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2251 [TOMOYO_MEMORY_QUERY] = "query message:",
2252 };
2253
2254 /* Timestamp counter for last updated. */
2255 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2256 /* Counter for number of updates. */
2257 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2258
2259 /**
2260 * tomoyo_update_stat - Update statistic counters.
2261 *
2262 * @index: Index for policy type.
2263 *
2264 * Returns nothing.
2265 */
2266 void tomoyo_update_stat(const u8 index)
2267 {
2268 struct timeval tv;
2269 do_gettimeofday(&tv);
2270 /*
2271 * I don't use atomic operations because race condition is not fatal.
2272 */
2273 tomoyo_stat_updated[index]++;
2274 tomoyo_stat_modified[index] = tv.tv_sec;
2275 }
2276
2277 /**
2278 * tomoyo_read_stat - Read statistic data.
2279 *
2280 * @head: Pointer to "struct tomoyo_io_buffer".
2281 *
2282 * Returns nothing.
2283 */
2284 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2285 {
2286 u8 i;
2287 unsigned int total = 0;
2288 if (head->r.eof)
2289 return;
2290 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2291 tomoyo_io_printf(head, "Policy %-30s %10u",
2292 tomoyo_policy_headers[i],
2293 tomoyo_stat_updated[i]);
2294 if (tomoyo_stat_modified[i]) {
2295 struct tomoyo_time stamp;
2296 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2297 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2298 "%02u:%02u:%02u)",
2299 stamp.year, stamp.month, stamp.day,
2300 stamp.hour, stamp.min, stamp.sec);
2301 }
2302 tomoyo_set_lf(head);
2303 }
2304 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2305 unsigned int used = tomoyo_memory_used[i];
2306 total += used;
2307 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2308 tomoyo_memory_headers[i], used);
2309 used = tomoyo_memory_quota[i];
2310 if (used)
2311 tomoyo_io_printf(head, " (Quota: %10u)", used);
2312 tomoyo_set_lf(head);
2313 }
2314 tomoyo_io_printf(head, "Total memory used: %10u\n",
2315 total);
2316 head->r.eof = true;
2317 }
2318
2319 /**
2320 * tomoyo_write_stat - Set memory quota.
2321 *
2322 * @head: Pointer to "struct tomoyo_io_buffer".
2323 *
2324 * Returns 0.
2325 */
2326 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2327 {
2328 char *data = head->write_buf;
2329 u8 i;
2330 if (tomoyo_str_starts(&data, "Memory used by "))
2331 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2332 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2333 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2334 return 0;
2335 }
2336
2337 /**
2338 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2339 *
2340 * @type: Type of interface.
2341 * @file: Pointer to "struct file".
2342 *
2343 * Returns 0 on success, negative value otherwise.
2344 */
2345 int tomoyo_open_control(const u8 type, struct file *file)
2346 {
2347 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2348
2349 if (!head)
2350 return -ENOMEM;
2351 mutex_init(&head->io_sem);
2352 head->type = type;
2353 switch (type) {
2354 case TOMOYO_DOMAINPOLICY:
2355 /* /sys/kernel/security/tomoyo/domain_policy */
2356 head->write = tomoyo_write_domain;
2357 head->read = tomoyo_read_domain;
2358 break;
2359 case TOMOYO_EXCEPTIONPOLICY:
2360 /* /sys/kernel/security/tomoyo/exception_policy */
2361 head->write = tomoyo_write_exception;
2362 head->read = tomoyo_read_exception;
2363 break;
2364 case TOMOYO_AUDIT:
2365 /* /sys/kernel/security/tomoyo/audit */
2366 head->poll = tomoyo_poll_log;
2367 head->read = tomoyo_read_log;
2368 break;
2369 case TOMOYO_PROCESS_STATUS:
2370 /* /sys/kernel/security/tomoyo/.process_status */
2371 head->write = tomoyo_write_pid;
2372 head->read = tomoyo_read_pid;
2373 break;
2374 case TOMOYO_VERSION:
2375 /* /sys/kernel/security/tomoyo/version */
2376 head->read = tomoyo_read_version;
2377 head->readbuf_size = 128;
2378 break;
2379 case TOMOYO_STAT:
2380 /* /sys/kernel/security/tomoyo/stat */
2381 head->write = tomoyo_write_stat;
2382 head->read = tomoyo_read_stat;
2383 head->readbuf_size = 1024;
2384 break;
2385 case TOMOYO_PROFILE:
2386 /* /sys/kernel/security/tomoyo/profile */
2387 head->write = tomoyo_write_profile;
2388 head->read = tomoyo_read_profile;
2389 break;
2390 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2391 head->poll = tomoyo_poll_query;
2392 head->write = tomoyo_write_answer;
2393 head->read = tomoyo_read_query;
2394 break;
2395 case TOMOYO_MANAGER:
2396 /* /sys/kernel/security/tomoyo/manager */
2397 head->write = tomoyo_write_manager;
2398 head->read = tomoyo_read_manager;
2399 break;
2400 }
2401 if (!(file->f_mode & FMODE_READ)) {
2402 /*
2403 * No need to allocate read_buf since it is not opened
2404 * for reading.
2405 */
2406 head->read = NULL;
2407 head->poll = NULL;
2408 } else if (!head->poll) {
2409 /* Don't allocate read_buf for poll() access. */
2410 if (!head->readbuf_size)
2411 head->readbuf_size = 4096 * 2;
2412 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2413 if (!head->read_buf) {
2414 kfree(head);
2415 return -ENOMEM;
2416 }
2417 }
2418 if (!(file->f_mode & FMODE_WRITE)) {
2419 /*
2420 * No need to allocate write_buf since it is not opened
2421 * for writing.
2422 */
2423 head->write = NULL;
2424 } else if (head->write) {
2425 head->writebuf_size = 4096 * 2;
2426 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2427 if (!head->write_buf) {
2428 kfree(head->read_buf);
2429 kfree(head);
2430 return -ENOMEM;
2431 }
2432 }
2433 /*
2434 * If the file is /sys/kernel/security/tomoyo/query , increment the
2435 * observer counter.
2436 * The obserber counter is used by tomoyo_supervisor() to see if
2437 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2438 */
2439 if (type == TOMOYO_QUERY)
2440 atomic_inc(&tomoyo_query_observers);
2441 file->private_data = head;
2442 tomoyo_notify_gc(head, true);
2443 return 0;
2444 }
2445
2446 /**
2447 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2448 *
2449 * @file: Pointer to "struct file".
2450 * @wait: Pointer to "poll_table". Maybe NULL.
2451 *
2452 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2453 * POLLOUT | POLLWRNORM otherwise.
2454 */
2455 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2456 {
2457 struct tomoyo_io_buffer *head = file->private_data;
2458 if (head->poll)
2459 return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2460 return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2461 }
2462
2463 /**
2464 * tomoyo_set_namespace_cursor - Set namespace to read.
2465 *
2466 * @head: Pointer to "struct tomoyo_io_buffer".
2467 *
2468 * Returns nothing.
2469 */
2470 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2471 {
2472 struct list_head *ns;
2473 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2474 head->type != TOMOYO_PROFILE)
2475 return;
2476 /*
2477 * If this is the first read, or reading previous namespace finished
2478 * and has more namespaces to read, update the namespace cursor.
2479 */
2480 ns = head->r.ns;
2481 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2482 /* Clearing is OK because tomoyo_flush() returned true. */
2483 memset(&head->r, 0, sizeof(head->r));
2484 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2485 }
2486 }
2487
2488 /**
2489 * tomoyo_has_more_namespace - Check for unread namespaces.
2490 *
2491 * @head: Pointer to "struct tomoyo_io_buffer".
2492 *
2493 * Returns true if we have more entries to print, false otherwise.
2494 */
2495 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2496 {
2497 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2498 head->type == TOMOYO_PROFILE) && head->r.eof &&
2499 head->r.ns->next != &tomoyo_namespace_list;
2500 }
2501
2502 /**
2503 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2504 *
2505 * @head: Pointer to "struct tomoyo_io_buffer".
2506 * @buffer: Poiner to buffer to write to.
2507 * @buffer_len: Size of @buffer.
2508 *
2509 * Returns bytes read on success, negative value otherwise.
2510 */
2511 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2512 const int buffer_len)
2513 {
2514 int len;
2515 int idx;
2516
2517 if (!head->read)
2518 return -ENOSYS;
2519 if (mutex_lock_interruptible(&head->io_sem))
2520 return -EINTR;
2521 head->read_user_buf = buffer;
2522 head->read_user_buf_avail = buffer_len;
2523 idx = tomoyo_read_lock();
2524 if (tomoyo_flush(head))
2525 /* Call the policy handler. */
2526 do {
2527 tomoyo_set_namespace_cursor(head);
2528 head->read(head);
2529 } while (tomoyo_flush(head) &&
2530 tomoyo_has_more_namespace(head));
2531 tomoyo_read_unlock(idx);
2532 len = head->read_user_buf - buffer;
2533 mutex_unlock(&head->io_sem);
2534 return len;
2535 }
2536
2537 /**
2538 * tomoyo_parse_policy - Parse a policy line.
2539 *
2540 * @head: Poiter to "struct tomoyo_io_buffer".
2541 * @line: Line to parse.
2542 *
2543 * Returns 0 on success, negative value otherwise.
2544 *
2545 * Caller holds tomoyo_read_lock().
2546 */
2547 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2548 {
2549 /* Delete request? */
2550 head->w.is_delete = !strncmp(line, "delete ", 7);
2551 if (head->w.is_delete)
2552 memmove(line, line + 7, strlen(line + 7) + 1);
2553 /* Selecting namespace to update. */
2554 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2555 head->type == TOMOYO_PROFILE) {
2556 if (*line == '<') {
2557 char *cp = strchr(line, ' ');
2558 if (cp) {
2559 *cp++ = '\0';
2560 head->w.ns = tomoyo_assign_namespace(line);
2561 memmove(line, cp, strlen(cp) + 1);
2562 } else
2563 head->w.ns = NULL;
2564 } else
2565 head->w.ns = &tomoyo_kernel_namespace;
2566 /* Don't allow updating if namespace is invalid. */
2567 if (!head->w.ns)
2568 return -ENOENT;
2569 }
2570 /* Do the update. */
2571 return head->write(head);
2572 }
2573
2574 /**
2575 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2576 *
2577 * @head: Pointer to "struct tomoyo_io_buffer".
2578 * @buffer: Pointer to buffer to read from.
2579 * @buffer_len: Size of @buffer.
2580 *
2581 * Returns @buffer_len on success, negative value otherwise.
2582 */
2583 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2584 const char __user *buffer, const int buffer_len)
2585 {
2586 int error = buffer_len;
2587 size_t avail_len = buffer_len;
2588 char *cp0 = head->write_buf;
2589 int idx;
2590 if (!head->write)
2591 return -ENOSYS;
2592 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2593 return -EFAULT;
2594 if (mutex_lock_interruptible(&head->io_sem))
2595 return -EINTR;
2596 head->read_user_buf_avail = 0;
2597 idx = tomoyo_read_lock();
2598 /* Read a line and dispatch it to the policy handler. */
2599 while (avail_len > 0) {
2600 char c;
2601 if (head->w.avail >= head->writebuf_size - 1) {
2602 const int len = head->writebuf_size * 2;
2603 char *cp = kzalloc(len, GFP_NOFS);
2604 if (!cp) {
2605 error = -ENOMEM;
2606 break;
2607 }
2608 memmove(cp, cp0, head->w.avail);
2609 kfree(cp0);
2610 head->write_buf = cp;
2611 cp0 = cp;
2612 head->writebuf_size = len;
2613 }
2614 if (get_user(c, buffer)) {
2615 error = -EFAULT;
2616 break;
2617 }
2618 buffer++;
2619 avail_len--;
2620 cp0[head->w.avail++] = c;
2621 if (c != '\n')
2622 continue;
2623 cp0[head->w.avail - 1] = '\0';
2624 head->w.avail = 0;
2625 tomoyo_normalize_line(cp0);
2626 if (!strcmp(cp0, "reset")) {
2627 head->w.ns = &tomoyo_kernel_namespace;
2628 head->w.domain = NULL;
2629 memset(&head->r, 0, sizeof(head->r));
2630 continue;
2631 }
2632 /* Don't allow updating policies by non manager programs. */
2633 switch (head->type) {
2634 case TOMOYO_PROCESS_STATUS:
2635 /* This does not write anything. */
2636 break;
2637 case TOMOYO_DOMAINPOLICY:
2638 if (tomoyo_select_domain(head, cp0))
2639 continue;
2640 /* fall through */
2641 case TOMOYO_EXCEPTIONPOLICY:
2642 if (!strcmp(cp0, "select transition_only")) {
2643 head->r.print_transition_related_only = true;
2644 continue;
2645 }
2646 /* fall through */
2647 default:
2648 if (!tomoyo_manager()) {
2649 error = -EPERM;
2650 goto out;
2651 }
2652 }
2653 switch (tomoyo_parse_policy(head, cp0)) {
2654 case -EPERM:
2655 error = -EPERM;
2656 goto out;
2657 case 0:
2658 switch (head->type) {
2659 case TOMOYO_DOMAINPOLICY:
2660 case TOMOYO_EXCEPTIONPOLICY:
2661 case TOMOYO_STAT:
2662 case TOMOYO_PROFILE:
2663 case TOMOYO_MANAGER:
2664 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2665 break;
2666 default:
2667 break;
2668 }
2669 break;
2670 }
2671 }
2672 out:
2673 tomoyo_read_unlock(idx);
2674 mutex_unlock(&head->io_sem);
2675 return error;
2676 }
2677
2678 /**
2679 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2680 *
2681 * @head: Pointer to "struct tomoyo_io_buffer".
2682 *
2683 * Returns 0.
2684 */
2685 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2686 {
2687 /*
2688 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2689 * observer counter.
2690 */
2691 if (head->type == TOMOYO_QUERY &&
2692 atomic_dec_and_test(&tomoyo_query_observers))
2693 wake_up_all(&tomoyo_answer_wait);
2694 tomoyo_notify_gc(head, false);
2695 return 0;
2696 }
2697
2698 /**
2699 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2700 */
2701 void tomoyo_check_profile(void)
2702 {
2703 struct tomoyo_domain_info *domain;
2704 const int idx = tomoyo_read_lock();
2705 tomoyo_policy_loaded = true;
2706 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2707 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2708 const u8 profile = domain->profile;
2709 const struct tomoyo_policy_namespace *ns = domain->ns;
2710 if (ns->profile_version != 20110903)
2711 printk(KERN_ERR
2712 "Profile version %u is not supported.\n",
2713 ns->profile_version);
2714 else if (!ns->profile_ptr[profile])
2715 printk(KERN_ERR
2716 "Profile %u (used by '%s') is not defined.\n",
2717 profile, domain->domainname->name);
2718 else
2719 continue;
2720 printk(KERN_ERR
2721 "Userland tools for TOMOYO 2.5 must be installed and "
2722 "policy must be initialized.\n");
2723 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2724 "for more information.\n");
2725 panic("STOP!");
2726 }
2727 tomoyo_read_unlock(idx);
2728 printk(KERN_INFO "Mandatory Access Control activated.\n");
2729 }
2730
2731 /**
2732 * tomoyo_load_builtin_policy - Load built-in policy.
2733 *
2734 * Returns nothing.
2735 */
2736 void __init tomoyo_load_builtin_policy(void)
2737 {
2738 /*
2739 * This include file is manually created and contains built-in policy
2740 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2741 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2742 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2743 */
2744 #include "builtin-policy.h"
2745 u8 i;
2746 const int idx = tomoyo_read_lock();
2747 for (i = 0; i < 5; i++) {
2748 struct tomoyo_io_buffer head = { };
2749 char *start = "";
2750 switch (i) {
2751 case 0:
2752 start = tomoyo_builtin_profile;
2753 head.type = TOMOYO_PROFILE;
2754 head.write = tomoyo_write_profile;
2755 break;
2756 case 1:
2757 start = tomoyo_builtin_exception_policy;
2758 head.type = TOMOYO_EXCEPTIONPOLICY;
2759 head.write = tomoyo_write_exception;
2760 break;
2761 case 2:
2762 start = tomoyo_builtin_domain_policy;
2763 head.type = TOMOYO_DOMAINPOLICY;
2764 head.write = tomoyo_write_domain;
2765 break;
2766 case 3:
2767 start = tomoyo_builtin_manager;
2768 head.type = TOMOYO_MANAGER;
2769 head.write = tomoyo_write_manager;
2770 break;
2771 case 4:
2772 start = tomoyo_builtin_stat;
2773 head.type = TOMOYO_STAT;
2774 head.write = tomoyo_write_stat;
2775 break;
2776 }
2777 while (1) {
2778 char *end = strchr(start, '\n');
2779 if (!end)
2780 break;
2781 *end = '\0';
2782 tomoyo_normalize_line(start);
2783 head.write_buf = start;
2784 tomoyo_parse_policy(&head, start);
2785 start = end + 1;
2786 }
2787 }
2788 tomoyo_read_unlock(idx);
2789 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2790 tomoyo_check_profile();
2791 #endif
2792 }
Linux with added FPC-III support