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TOMOYO: Fix incomplete read after seek.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / tomoyo / common.c
blobd41900de8a69d267dce90c66b7ef0fc21229bb48
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 return;
753 head->r.step++;
754 break;
755 case 2:
756 {
757 u8 i;
758 const struct tomoyo_path_info *comment =
759 profile->comment;
760 tomoyo_print_namespace(head);
761 tomoyo_io_printf(head, "%u-COMMENT=", index);
762 tomoyo_set_string(head, comment ? comment->name : "");
763 tomoyo_set_lf(head);
764 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
765 for (i = 0; i < TOMOYO_MAX_PREF; i++)
766 tomoyo_io_printf(head, "%s=%u ",
767 tomoyo_pref_keywords[i],
768 profile->pref[i]);
769 tomoyo_set_string(head, "}\n");
770 head->r.step++;
771 }
772 break;
773 case 3:
774 {
775 tomoyo_print_namespace(head);
776 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
777 tomoyo_print_config(head, profile->default_config);
778 head->r.bit = 0;
779 head->r.step++;
780 }
781 break;
782 case 4:
783 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
784 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
785 const u8 i = head->r.bit;
786 const u8 config = profile->config[i];
787 if (config == TOMOYO_CONFIG_USE_DEFAULT)
788 continue;
789 tomoyo_print_namespace(head);
790 if (i < TOMOYO_MAX_MAC_INDEX)
791 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
792 index,
793 tomoyo_category_keywords
794 [tomoyo_index2category[i]],
795 tomoyo_mac_keywords[i]);
796 else
797 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
798 tomoyo_mac_keywords[i]);
799 tomoyo_print_config(head, config);
800 head->r.bit++;
801 break;
802 }
803 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
804 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
805 head->r.index++;
806 head->r.step = 1;
807 }
808 break;
809 }
810 if (tomoyo_flush(head))
811 goto next;
812 }
813
814 /**
815 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
816 *
817 * @a: Pointer to "struct tomoyo_acl_head".
818 * @b: Pointer to "struct tomoyo_acl_head".
819 *
820 * Returns true if @a == @b, false otherwise.
821 */
822 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
823 const struct tomoyo_acl_head *b)
824 {
825 return container_of(a, struct tomoyo_manager, head)->manager ==
826 container_of(b, struct tomoyo_manager, head)->manager;
827 }
828
829 /**
830 * tomoyo_update_manager_entry - Add a manager entry.
831 *
832 * @manager: The path to manager or the domainnamme.
833 * @is_delete: True if it is a delete request.
834 *
835 * Returns 0 on success, negative value otherwise.
836 *
837 * Caller holds tomoyo_read_lock().
838 */
839 static int tomoyo_update_manager_entry(const char *manager,
840 const bool is_delete)
841 {
842 struct tomoyo_manager e = { };
843 struct tomoyo_acl_param param = {
844 /* .ns = &tomoyo_kernel_namespace, */
845 .is_delete = is_delete,
846 .list = &tomoyo_kernel_namespace.
847 policy_list[TOMOYO_ID_MANAGER],
848 };
849 int error = is_delete ? -ENOENT : -ENOMEM;
850 if (tomoyo_domain_def(manager)) {
851 if (!tomoyo_correct_domain(manager))
852 return -EINVAL;
853 e.is_domain = true;
854 } else {
855 if (!tomoyo_correct_path(manager))
856 return -EINVAL;
857 }
858 e.manager = tomoyo_get_name(manager);
859 if (e.manager) {
860 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
861 tomoyo_same_manager);
862 tomoyo_put_name(e.manager);
863 }
864 return error;
865 }
866
867 /**
868 * tomoyo_write_manager - Write manager policy.
869 *
870 * @head: Pointer to "struct tomoyo_io_buffer".
871 *
872 * Returns 0 on success, negative value otherwise.
873 *
874 * Caller holds tomoyo_read_lock().
875 */
876 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
877 {
878 char *data = head->write_buf;
879
880 if (!strcmp(data, "manage_by_non_root")) {
881 tomoyo_manage_by_non_root = !head->w.is_delete;
882 return 0;
883 }
884 return tomoyo_update_manager_entry(data, head->w.is_delete);
885 }
886
887 /**
888 * tomoyo_read_manager - Read manager policy.
889 *
890 * @head: Pointer to "struct tomoyo_io_buffer".
891 *
892 * Caller holds tomoyo_read_lock().
893 */
894 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
895 {
896 if (head->r.eof)
897 return;
898 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
899 policy_list[TOMOYO_ID_MANAGER]) {
900 struct tomoyo_manager *ptr =
901 list_entry(head->r.acl, typeof(*ptr), head.list);
902 if (ptr->head.is_deleted)
903 continue;
904 if (!tomoyo_flush(head))
905 return;
906 tomoyo_set_string(head, ptr->manager->name);
907 tomoyo_set_lf(head);
908 }
909 head->r.eof = true;
910 }
911
912 /**
913 * tomoyo_manager - Check whether the current process is a policy manager.
914 *
915 * Returns true if the current process is permitted to modify policy
916 * via /sys/kernel/security/tomoyo/ interface.
917 *
918 * Caller holds tomoyo_read_lock().
919 */
920 static bool tomoyo_manager(void)
921 {
922 struct tomoyo_manager *ptr;
923 const char *exe;
924 const struct task_struct *task = current;
925 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
926 bool found = false;
927
928 if (!tomoyo_policy_loaded)
929 return true;
930 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
931 return false;
932 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
933 policy_list[TOMOYO_ID_MANAGER], head.list) {
934 if (!ptr->head.is_deleted && ptr->is_domain
935 && !tomoyo_pathcmp(domainname, ptr->manager)) {
936 found = true;
937 break;
938 }
939 }
940 if (found)
941 return true;
942 exe = tomoyo_get_exe();
943 if (!exe)
944 return false;
945 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
946 policy_list[TOMOYO_ID_MANAGER], head.list) {
947 if (!ptr->head.is_deleted && !ptr->is_domain
948 && !strcmp(exe, ptr->manager->name)) {
949 found = true;
950 break;
951 }
952 }
953 if (!found) { /* Reduce error messages. */
954 static pid_t last_pid;
955 const pid_t pid = current->pid;
956 if (last_pid != pid) {
957 printk(KERN_WARNING "%s ( %s ) is not permitted to "
958 "update policies.\n", domainname->name, exe);
959 last_pid = pid;
960 }
961 }
962 kfree(exe);
963 return found;
964 }
965
966 /**
967 * tomoyo_select_domain - Parse select command.
968 *
969 * @head: Pointer to "struct tomoyo_io_buffer".
970 * @data: String to parse.
971 *
972 * Returns true on success, false otherwise.
973 *
974 * Caller holds tomoyo_read_lock().
975 */
976 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
977 const char *data)
978 {
979 unsigned int pid;
980 struct tomoyo_domain_info *domain = NULL;
981 bool global_pid = false;
982 if (strncmp(data, "select ", 7))
983 return false;
984 data += 7;
985 if (sscanf(data, "pid=%u", &pid) == 1 ||
986 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
987 struct task_struct *p;
988 rcu_read_lock();
989 if (global_pid)
990 p = find_task_by_pid_ns(pid, &init_pid_ns);
991 else
992 p = find_task_by_vpid(pid);
993 if (p)
994 domain = tomoyo_real_domain(p);
995 rcu_read_unlock();
996 } else if (!strncmp(data, "domain=", 7)) {
997 if (tomoyo_domain_def(data + 7))
998 domain = tomoyo_find_domain(data + 7);
999 } else
1000 return false;
1001 head->w.domain = domain;
1002 /* Accessing read_buf is safe because head->io_sem is held. */
1003 if (!head->read_buf)
1004 return true; /* Do nothing if open(O_WRONLY). */
1005 memset(&head->r, 0, sizeof(head->r));
1006 head->r.print_this_domain_only = true;
1007 if (domain)
1008 head->r.domain = &domain->list;
1009 else
1010 head->r.eof = 1;
1011 tomoyo_io_printf(head, "# select %s\n", data);
1012 if (domain && domain->is_deleted)
1013 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1014 return true;
1015 }
1016
1017 /**
1018 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1019 *
1020 * @a: Pointer to "struct tomoyo_acl_info".
1021 * @b: Pointer to "struct tomoyo_acl_info".
1022 *
1023 * Returns true if @a == @b, false otherwise.
1024 */
1025 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1026 const struct tomoyo_acl_info *b)
1027 {
1028 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1029 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1030 return p1->domainname == p2->domainname;
1031 }
1032
1033 /**
1034 * tomoyo_write_task - Update task related list.
1035 *
1036 * @param: Pointer to "struct tomoyo_acl_param".
1037 *
1038 * Returns 0 on success, negative value otherwise.
1039 *
1040 * Caller holds tomoyo_read_lock().
1041 */
1042 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1043 {
1044 int error = -EINVAL;
1045 if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1046 struct tomoyo_task_acl e = {
1047 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1048 .domainname = tomoyo_get_domainname(param),
1049 };
1050 if (e.domainname)
1051 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1052 tomoyo_same_task_acl,
1053 NULL);
1054 tomoyo_put_name(e.domainname);
1055 }
1056 return error;
1057 }
1058
1059 /**
1060 * tomoyo_delete_domain - Delete a domain.
1061 *
1062 * @domainname: The name of domain.
1063 *
1064 * Returns 0.
1065 *
1066 * Caller holds tomoyo_read_lock().
1067 */
1068 static int tomoyo_delete_domain(char *domainname)
1069 {
1070 struct tomoyo_domain_info *domain;
1071 struct tomoyo_path_info name;
1072
1073 name.name = domainname;
1074 tomoyo_fill_path_info(&name);
1075 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1076 return 0;
1077 /* Is there an active domain? */
1078 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1079 /* Never delete tomoyo_kernel_domain */
1080 if (domain == &tomoyo_kernel_domain)
1081 continue;
1082 if (domain->is_deleted ||
1083 tomoyo_pathcmp(domain->domainname, &name))
1084 continue;
1085 domain->is_deleted = true;
1086 break;
1087 }
1088 mutex_unlock(&tomoyo_policy_lock);
1089 return 0;
1090 }
1091
1092 /**
1093 * tomoyo_write_domain2 - Write domain policy.
1094 *
1095 * @ns: Pointer to "struct tomoyo_policy_namespace".
1096 * @list: Pointer to "struct list_head".
1097 * @data: Policy to be interpreted.
1098 * @is_delete: True if it is a delete request.
1099 *
1100 * Returns 0 on success, negative value otherwise.
1101 *
1102 * Caller holds tomoyo_read_lock().
1103 */
1104 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1105 struct list_head *list, char *data,
1106 const bool is_delete)
1107 {
1108 struct tomoyo_acl_param param = {
1109 .ns = ns,
1110 .list = list,
1111 .data = data,
1112 .is_delete = is_delete,
1113 };
1114 static const struct {
1115 const char *keyword;
1116 int (*write) (struct tomoyo_acl_param *);
1117 } tomoyo_callback[5] = {
1118 { "file ", tomoyo_write_file },
1119 { "network inet ", tomoyo_write_inet_network },
1120 { "network unix ", tomoyo_write_unix_network },
1121 { "misc ", tomoyo_write_misc },
1122 { "task ", tomoyo_write_task },
1123 };
1124 u8 i;
1125
1126 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1127 if (!tomoyo_str_starts(&param.data,
1128 tomoyo_callback[i].keyword))
1129 continue;
1130 return tomoyo_callback[i].write(&param);
1131 }
1132 return -EINVAL;
1133 }
1134
1135 /* String table for domain flags. */
1136 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1137 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1138 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1139 };
1140
1141 /**
1142 * tomoyo_write_domain - Write domain policy.
1143 *
1144 * @head: Pointer to "struct tomoyo_io_buffer".
1145 *
1146 * Returns 0 on success, negative value otherwise.
1147 *
1148 * Caller holds tomoyo_read_lock().
1149 */
1150 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1151 {
1152 char *data = head->write_buf;
1153 struct tomoyo_policy_namespace *ns;
1154 struct tomoyo_domain_info *domain = head->w.domain;
1155 const bool is_delete = head->w.is_delete;
1156 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1157 unsigned int profile;
1158 if (*data == '<') {
1159 domain = NULL;
1160 if (is_delete)
1161 tomoyo_delete_domain(data);
1162 else if (is_select)
1163 domain = tomoyo_find_domain(data);
1164 else
1165 domain = tomoyo_assign_domain(data, false);
1166 head->w.domain = domain;
1167 return 0;
1168 }
1169 if (!domain)
1170 return -EINVAL;
1171 ns = domain->ns;
1172 if (sscanf(data, "use_profile %u", &profile) == 1
1173 && profile < TOMOYO_MAX_PROFILES) {
1174 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1175 domain->profile = (u8) profile;
1176 return 0;
1177 }
1178 if (sscanf(data, "use_group %u\n", &profile) == 1
1179 && profile < TOMOYO_MAX_ACL_GROUPS) {
1180 if (!is_delete)
1181 domain->group = (u8) profile;
1182 return 0;
1183 }
1184 for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1185 const char *cp = tomoyo_dif[profile];
1186 if (strncmp(data, cp, strlen(cp) - 1))
1187 continue;
1188 domain->flags[profile] = !is_delete;
1189 return 0;
1190 }
1191 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1192 is_delete);
1193 }
1194
1195 /**
1196 * tomoyo_print_condition - Print condition part.
1197 *
1198 * @head: Pointer to "struct tomoyo_io_buffer".
1199 * @cond: Pointer to "struct tomoyo_condition".
1200 *
1201 * Returns true on success, false otherwise.
1202 */
1203 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1204 const struct tomoyo_condition *cond)
1205 {
1206 switch (head->r.cond_step) {
1207 case 0:
1208 head->r.cond_index = 0;
1209 head->r.cond_step++;
1210 if (cond->transit) {
1211 tomoyo_set_space(head);
1212 tomoyo_set_string(head, cond->transit->name);
1213 }
1214 /* fall through */
1215 case 1:
1216 {
1217 const u16 condc = cond->condc;
1218 const struct tomoyo_condition_element *condp =
1219 (typeof(condp)) (cond + 1);
1220 const struct tomoyo_number_union *numbers_p =
1221 (typeof(numbers_p)) (condp + condc);
1222 const struct tomoyo_name_union *names_p =
1223 (typeof(names_p))
1224 (numbers_p + cond->numbers_count);
1225 const struct tomoyo_argv *argv =
1226 (typeof(argv)) (names_p + cond->names_count);
1227 const struct tomoyo_envp *envp =
1228 (typeof(envp)) (argv + cond->argc);
1229 u16 skip;
1230 for (skip = 0; skip < head->r.cond_index; skip++) {
1231 const u8 left = condp->left;
1232 const u8 right = condp->right;
1233 condp++;
1234 switch (left) {
1235 case TOMOYO_ARGV_ENTRY:
1236 argv++;
1237 continue;
1238 case TOMOYO_ENVP_ENTRY:
1239 envp++;
1240 continue;
1241 case TOMOYO_NUMBER_UNION:
1242 numbers_p++;
1243 break;
1244 }
1245 switch (right) {
1246 case TOMOYO_NAME_UNION:
1247 names_p++;
1248 break;
1249 case TOMOYO_NUMBER_UNION:
1250 numbers_p++;
1251 break;
1252 }
1253 }
1254 while (head->r.cond_index < condc) {
1255 const u8 match = condp->equals;
1256 const u8 left = condp->left;
1257 const u8 right = condp->right;
1258 if (!tomoyo_flush(head))
1259 return false;
1260 condp++;
1261 head->r.cond_index++;
1262 tomoyo_set_space(head);
1263 switch (left) {
1264 case TOMOYO_ARGV_ENTRY:
1265 tomoyo_io_printf(head,
1266 "exec.argv[%lu]%s=\"",
1267 argv->index, argv->
1268 is_not ? "!" : "");
1269 tomoyo_set_string(head,
1270 argv->value->name);
1271 tomoyo_set_string(head, "\"");
1272 argv++;
1273 continue;
1274 case TOMOYO_ENVP_ENTRY:
1275 tomoyo_set_string(head,
1276 "exec.envp[\"");
1277 tomoyo_set_string(head,
1278 envp->name->name);
1279 tomoyo_io_printf(head, "\"]%s=", envp->
1280 is_not ? "!" : "");
1281 if (envp->value) {
1282 tomoyo_set_string(head, "\"");
1283 tomoyo_set_string(head, envp->
1284 value->name);
1285 tomoyo_set_string(head, "\"");
1286 } else {
1287 tomoyo_set_string(head,
1288 "NULL");
1289 }
1290 envp++;
1291 continue;
1292 case TOMOYO_NUMBER_UNION:
1293 tomoyo_print_number_union_nospace
1294 (head, numbers_p++);
1295 break;
1296 default:
1297 tomoyo_set_string(head,
1298 tomoyo_condition_keyword[left]);
1299 break;
1300 }
1301 tomoyo_set_string(head, match ? "=" : "!=");
1302 switch (right) {
1303 case TOMOYO_NAME_UNION:
1304 tomoyo_print_name_union_quoted
1305 (head, names_p++);
1306 break;
1307 case TOMOYO_NUMBER_UNION:
1308 tomoyo_print_number_union_nospace
1309 (head, numbers_p++);
1310 break;
1311 default:
1312 tomoyo_set_string(head,
1313 tomoyo_condition_keyword[right]);
1314 break;
1315 }
1316 }
1317 }
1318 head->r.cond_step++;
1319 /* fall through */
1320 case 2:
1321 if (!tomoyo_flush(head))
1322 break;
1323 head->r.cond_step++;
1324 /* fall through */
1325 case 3:
1326 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1327 tomoyo_io_printf(head, " grant_log=%s",
1328 tomoyo_yesno(cond->grant_log ==
1329 TOMOYO_GRANTLOG_YES));
1330 tomoyo_set_lf(head);
1331 return true;
1332 }
1333 return false;
1334 }
1335
1336 /**
1337 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1338 *
1339 * @head: Pointer to "struct tomoyo_io_buffer".
1340 * @category: Category name.
1341 *
1342 * Returns nothing.
1343 */
1344 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1345 const char *category)
1346 {
1347 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1348 tomoyo_print_namespace(head);
1349 tomoyo_io_printf(head, "acl_group %u ",
1350 head->r.acl_group_index);
1351 }
1352 tomoyo_set_string(head, category);
1353 }
1354
1355 /**
1356 * tomoyo_print_entry - Print an ACL entry.
1357 *
1358 * @head: Pointer to "struct tomoyo_io_buffer".
1359 * @acl: Pointer to an ACL entry.
1360 *
1361 * Returns true on success, false otherwise.
1362 */
1363 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1364 struct tomoyo_acl_info *acl)
1365 {
1366 const u8 acl_type = acl->type;
1367 bool first = true;
1368 u8 bit;
1369
1370 if (head->r.print_cond_part)
1371 goto print_cond_part;
1372 if (acl->is_deleted)
1373 return true;
1374 if (!tomoyo_flush(head))
1375 return false;
1376 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1377 struct tomoyo_path_acl *ptr =
1378 container_of(acl, typeof(*ptr), head);
1379 const u16 perm = ptr->perm;
1380 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1381 if (!(perm & (1 << bit)))
1382 continue;
1383 if (head->r.print_transition_related_only &&
1384 bit != TOMOYO_TYPE_EXECUTE)
1385 continue;
1386 if (first) {
1387 tomoyo_set_group(head, "file ");
1388 first = false;
1389 } else {
1390 tomoyo_set_slash(head);
1391 }
1392 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1393 }
1394 if (first)
1395 return true;
1396 tomoyo_print_name_union(head, &ptr->name);
1397 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1398 struct tomoyo_task_acl *ptr =
1399 container_of(acl, typeof(*ptr), head);
1400 tomoyo_set_group(head, "task ");
1401 tomoyo_set_string(head, "manual_domain_transition ");
1402 tomoyo_set_string(head, ptr->domainname->name);
1403 } else if (head->r.print_transition_related_only) {
1404 return true;
1405 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1406 struct tomoyo_path2_acl *ptr =
1407 container_of(acl, typeof(*ptr), head);
1408 const u8 perm = ptr->perm;
1409 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1410 if (!(perm & (1 << bit)))
1411 continue;
1412 if (first) {
1413 tomoyo_set_group(head, "file ");
1414 first = false;
1415 } else {
1416 tomoyo_set_slash(head);
1417 }
1418 tomoyo_set_string(head, tomoyo_mac_keywords
1419 [tomoyo_pp2mac[bit]]);
1420 }
1421 if (first)
1422 return true;
1423 tomoyo_print_name_union(head, &ptr->name1);
1424 tomoyo_print_name_union(head, &ptr->name2);
1425 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1426 struct tomoyo_path_number_acl *ptr =
1427 container_of(acl, typeof(*ptr), head);
1428 const u8 perm = ptr->perm;
1429 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1430 if (!(perm & (1 << bit)))
1431 continue;
1432 if (first) {
1433 tomoyo_set_group(head, "file ");
1434 first = false;
1435 } else {
1436 tomoyo_set_slash(head);
1437 }
1438 tomoyo_set_string(head, tomoyo_mac_keywords
1439 [tomoyo_pn2mac[bit]]);
1440 }
1441 if (first)
1442 return true;
1443 tomoyo_print_name_union(head, &ptr->name);
1444 tomoyo_print_number_union(head, &ptr->number);
1445 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1446 struct tomoyo_mkdev_acl *ptr =
1447 container_of(acl, typeof(*ptr), head);
1448 const u8 perm = ptr->perm;
1449 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1450 if (!(perm & (1 << bit)))
1451 continue;
1452 if (first) {
1453 tomoyo_set_group(head, "file ");
1454 first = false;
1455 } else {
1456 tomoyo_set_slash(head);
1457 }
1458 tomoyo_set_string(head, tomoyo_mac_keywords
1459 [tomoyo_pnnn2mac[bit]]);
1460 }
1461 if (first)
1462 return true;
1463 tomoyo_print_name_union(head, &ptr->name);
1464 tomoyo_print_number_union(head, &ptr->mode);
1465 tomoyo_print_number_union(head, &ptr->major);
1466 tomoyo_print_number_union(head, &ptr->minor);
1467 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1468 struct tomoyo_inet_acl *ptr =
1469 container_of(acl, typeof(*ptr), head);
1470 const u8 perm = ptr->perm;
1471
1472 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1473 if (!(perm & (1 << bit)))
1474 continue;
1475 if (first) {
1476 tomoyo_set_group(head, "network inet ");
1477 tomoyo_set_string(head, tomoyo_proto_keyword
1478 [ptr->protocol]);
1479 tomoyo_set_space(head);
1480 first = false;
1481 } else {
1482 tomoyo_set_slash(head);
1483 }
1484 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1485 }
1486 if (first)
1487 return true;
1488 tomoyo_set_space(head);
1489 if (ptr->address.group) {
1490 tomoyo_set_string(head, "@");
1491 tomoyo_set_string(head, ptr->address.group->group_name
1492 ->name);
1493 } else {
1494 char buf[128];
1495 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1496 tomoyo_io_printf(head, "%s", buf);
1497 }
1498 tomoyo_print_number_union(head, &ptr->port);
1499 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1500 struct tomoyo_unix_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 unix ");
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_print_name_union(head, &ptr->name);
1521 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1522 struct tomoyo_mount_acl *ptr =
1523 container_of(acl, typeof(*ptr), head);
1524 tomoyo_set_group(head, "file mount");
1525 tomoyo_print_name_union(head, &ptr->dev_name);
1526 tomoyo_print_name_union(head, &ptr->dir_name);
1527 tomoyo_print_name_union(head, &ptr->fs_type);
1528 tomoyo_print_number_union(head, &ptr->flags);
1529 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1530 struct tomoyo_env_acl *ptr =
1531 container_of(acl, typeof(*ptr), head);
1532
1533 tomoyo_set_group(head, "misc env ");
1534 tomoyo_set_string(head, ptr->env->name);
1535 }
1536 if (acl->cond) {
1537 head->r.print_cond_part = true;
1538 head->r.cond_step = 0;
1539 if (!tomoyo_flush(head))
1540 return false;
1541 print_cond_part:
1542 if (!tomoyo_print_condition(head, acl->cond))
1543 return false;
1544 head->r.print_cond_part = false;
1545 } else {
1546 tomoyo_set_lf(head);
1547 }
1548 return true;
1549 }
1550
1551 /**
1552 * tomoyo_read_domain2 - Read domain policy.
1553 *
1554 * @head: Pointer to "struct tomoyo_io_buffer".
1555 * @list: Pointer to "struct list_head".
1556 *
1557 * Caller holds tomoyo_read_lock().
1558 *
1559 * Returns true on success, false otherwise.
1560 */
1561 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1562 struct list_head *list)
1563 {
1564 list_for_each_cookie(head->r.acl, list) {
1565 struct tomoyo_acl_info *ptr =
1566 list_entry(head->r.acl, typeof(*ptr), list);
1567 if (!tomoyo_print_entry(head, ptr))
1568 return false;
1569 }
1570 head->r.acl = NULL;
1571 return true;
1572 }
1573
1574 /**
1575 * tomoyo_read_domain - Read domain policy.
1576 *
1577 * @head: Pointer to "struct tomoyo_io_buffer".
1578 *
1579 * Caller holds tomoyo_read_lock().
1580 */
1581 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1582 {
1583 if (head->r.eof)
1584 return;
1585 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1586 struct tomoyo_domain_info *domain =
1587 list_entry(head->r.domain, typeof(*domain), list);
1588 switch (head->r.step) {
1589 u8 i;
1590 case 0:
1591 if (domain->is_deleted &&
1592 !head->r.print_this_domain_only)
1593 continue;
1594 /* Print domainname and flags. */
1595 tomoyo_set_string(head, domain->domainname->name);
1596 tomoyo_set_lf(head);
1597 tomoyo_io_printf(head, "use_profile %u\n",
1598 domain->profile);
1599 tomoyo_io_printf(head, "use_group %u\n",
1600 domain->group);
1601 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1602 if (domain->flags[i])
1603 tomoyo_set_string(head, tomoyo_dif[i]);
1604 head->r.step++;
1605 tomoyo_set_lf(head);
1606 /* fall through */
1607 case 1:
1608 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1609 return;
1610 head->r.step++;
1611 if (!tomoyo_set_lf(head))
1612 return;
1613 /* fall through */
1614 case 2:
1615 head->r.step = 0;
1616 if (head->r.print_this_domain_only)
1617 goto done;
1618 }
1619 }
1620 done:
1621 head->r.eof = true;
1622 }
1623
1624 /**
1625 * tomoyo_write_pid: Specify PID to obtain domainname.
1626 *
1627 * @head: Pointer to "struct tomoyo_io_buffer".
1628 *
1629 * Returns 0.
1630 */
1631 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1632 {
1633 head->r.eof = false;
1634 return 0;
1635 }
1636
1637 /**
1638 * tomoyo_read_pid - Get domainname of the specified PID.
1639 *
1640 * @head: Pointer to "struct tomoyo_io_buffer".
1641 *
1642 * Returns the domainname which the specified PID is in on success,
1643 * empty string otherwise.
1644 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1645 * using read()/write() interface rather than sysctl() interface.
1646 */
1647 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1648 {
1649 char *buf = head->write_buf;
1650 bool global_pid = false;
1651 unsigned int pid;
1652 struct task_struct *p;
1653 struct tomoyo_domain_info *domain = NULL;
1654
1655 /* Accessing write_buf is safe because head->io_sem is held. */
1656 if (!buf) {
1657 head->r.eof = true;
1658 return; /* Do nothing if open(O_RDONLY). */
1659 }
1660 if (head->r.w_pos || head->r.eof)
1661 return;
1662 head->r.eof = true;
1663 if (tomoyo_str_starts(&buf, "global-pid "))
1664 global_pid = true;
1665 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1666 rcu_read_lock();
1667 if (global_pid)
1668 p = find_task_by_pid_ns(pid, &init_pid_ns);
1669 else
1670 p = find_task_by_vpid(pid);
1671 if (p)
1672 domain = tomoyo_real_domain(p);
1673 rcu_read_unlock();
1674 if (!domain)
1675 return;
1676 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1677 tomoyo_set_string(head, domain->domainname->name);
1678 }
1679
1680 /* String table for domain transition control keywords. */
1681 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1682 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1683 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1684 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1685 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1686 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1687 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1688 };
1689
1690 /* String table for grouping keywords. */
1691 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1692 [TOMOYO_PATH_GROUP] = "path_group ",
1693 [TOMOYO_NUMBER_GROUP] = "number_group ",
1694 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1695 };
1696
1697 /**
1698 * tomoyo_write_exception - Write exception policy.
1699 *
1700 * @head: Pointer to "struct tomoyo_io_buffer".
1701 *
1702 * Returns 0 on success, negative value otherwise.
1703 *
1704 * Caller holds tomoyo_read_lock().
1705 */
1706 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1707 {
1708 const bool is_delete = head->w.is_delete;
1709 struct tomoyo_acl_param param = {
1710 .ns = head->w.ns,
1711 .is_delete = is_delete,
1712 .data = head->write_buf,
1713 };
1714 u8 i;
1715 if (tomoyo_str_starts(&param.data, "aggregator "))
1716 return tomoyo_write_aggregator(&param);
1717 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1718 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1719 return tomoyo_write_transition_control(&param, i);
1720 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1721 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1722 return tomoyo_write_group(&param, i);
1723 if (tomoyo_str_starts(&param.data, "acl_group ")) {
1724 unsigned int group;
1725 char *data;
1726 group = simple_strtoul(param.data, &data, 10);
1727 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1728 return tomoyo_write_domain2
1729 (head->w.ns, &head->w.ns->acl_group[group],
1730 data, is_delete);
1731 }
1732 return -EINVAL;
1733 }
1734
1735 /**
1736 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1737 *
1738 * @head: Pointer to "struct tomoyo_io_buffer".
1739 * @idx: Index number.
1740 *
1741 * Returns true on success, false otherwise.
1742 *
1743 * Caller holds tomoyo_read_lock().
1744 */
1745 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1746 {
1747 struct tomoyo_policy_namespace *ns =
1748 container_of(head->r.ns, typeof(*ns), namespace_list);
1749 struct list_head *list = &ns->group_list[idx];
1750 list_for_each_cookie(head->r.group, list) {
1751 struct tomoyo_group *group =
1752 list_entry(head->r.group, typeof(*group), head.list);
1753 list_for_each_cookie(head->r.acl, &group->member_list) {
1754 struct tomoyo_acl_head *ptr =
1755 list_entry(head->r.acl, typeof(*ptr), list);
1756 if (ptr->is_deleted)
1757 continue;
1758 if (!tomoyo_flush(head))
1759 return false;
1760 tomoyo_print_namespace(head);
1761 tomoyo_set_string(head, tomoyo_group_name[idx]);
1762 tomoyo_set_string(head, group->group_name->name);
1763 if (idx == TOMOYO_PATH_GROUP) {
1764 tomoyo_set_space(head);
1765 tomoyo_set_string(head, container_of
1766 (ptr, struct tomoyo_path_group,
1767 head)->member_name->name);
1768 } else if (idx == TOMOYO_NUMBER_GROUP) {
1769 tomoyo_print_number_union(head, &container_of
1770 (ptr,
1771 struct tomoyo_number_group,
1772 head)->number);
1773 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1774 char buffer[128];
1775
1776 struct tomoyo_address_group *member =
1777 container_of(ptr, typeof(*member),
1778 head);
1779 tomoyo_print_ip(buffer, sizeof(buffer),
1780 &member->address);
1781 tomoyo_io_printf(head, " %s", buffer);
1782 }
1783 tomoyo_set_lf(head);
1784 }
1785 head->r.acl = NULL;
1786 }
1787 head->r.group = NULL;
1788 return true;
1789 }
1790
1791 /**
1792 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1793 *
1794 * @head: Pointer to "struct tomoyo_io_buffer".
1795 * @idx: Index number.
1796 *
1797 * Returns true on success, false otherwise.
1798 *
1799 * Caller holds tomoyo_read_lock().
1800 */
1801 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1802 {
1803 struct tomoyo_policy_namespace *ns =
1804 container_of(head->r.ns, typeof(*ns), namespace_list);
1805 struct list_head *list = &ns->policy_list[idx];
1806 list_for_each_cookie(head->r.acl, list) {
1807 struct tomoyo_acl_head *acl =
1808 container_of(head->r.acl, typeof(*acl), list);
1809 if (acl->is_deleted)
1810 continue;
1811 if (!tomoyo_flush(head))
1812 return false;
1813 switch (idx) {
1814 case TOMOYO_ID_TRANSITION_CONTROL:
1815 {
1816 struct tomoyo_transition_control *ptr =
1817 container_of(acl, typeof(*ptr), head);
1818 tomoyo_print_namespace(head);
1819 tomoyo_set_string(head, tomoyo_transition_type
1820 [ptr->type]);
1821 tomoyo_set_string(head, ptr->program ?
1822 ptr->program->name : "any");
1823 tomoyo_set_string(head, " from ");
1824 tomoyo_set_string(head, ptr->domainname ?
1825 ptr->domainname->name :
1826 "any");
1827 }
1828 break;
1829 case TOMOYO_ID_AGGREGATOR:
1830 {
1831 struct tomoyo_aggregator *ptr =
1832 container_of(acl, typeof(*ptr), head);
1833 tomoyo_print_namespace(head);
1834 tomoyo_set_string(head, "aggregator ");
1835 tomoyo_set_string(head,
1836 ptr->original_name->name);
1837 tomoyo_set_space(head);
1838 tomoyo_set_string(head,
1839 ptr->aggregated_name->name);
1840 }
1841 break;
1842 default:
1843 continue;
1844 }
1845 tomoyo_set_lf(head);
1846 }
1847 head->r.acl = NULL;
1848 return true;
1849 }
1850
1851 /**
1852 * tomoyo_read_exception - Read exception policy.
1853 *
1854 * @head: Pointer to "struct tomoyo_io_buffer".
1855 *
1856 * Caller holds tomoyo_read_lock().
1857 */
1858 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1859 {
1860 struct tomoyo_policy_namespace *ns =
1861 container_of(head->r.ns, typeof(*ns), namespace_list);
1862 if (head->r.eof)
1863 return;
1864 while (head->r.step < TOMOYO_MAX_POLICY &&
1865 tomoyo_read_policy(head, head->r.step))
1866 head->r.step++;
1867 if (head->r.step < TOMOYO_MAX_POLICY)
1868 return;
1869 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1870 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1871 head->r.step++;
1872 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1873 return;
1874 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1875 + TOMOYO_MAX_ACL_GROUPS) {
1876 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1877 - TOMOYO_MAX_GROUP;
1878 if (!tomoyo_read_domain2(head, &ns->acl_group
1879 [head->r.acl_group_index]))
1880 return;
1881 head->r.step++;
1882 }
1883 head->r.eof = true;
1884 }
1885
1886 /* Wait queue for kernel -> userspace notification. */
1887 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1888 /* Wait queue for userspace -> kernel notification. */
1889 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1890
1891 /* Structure for query. */
1892 struct tomoyo_query {
1893 struct list_head list;
1894 char *query;
1895 size_t query_len;
1896 unsigned int serial;
1897 u8 timer;
1898 u8 answer;
1899 u8 retry;
1900 };
1901
1902 /* The list for "struct tomoyo_query". */
1903 static LIST_HEAD(tomoyo_query_list);
1904
1905 /* Lock for manipulating tomoyo_query_list. */
1906 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1907
1908 /*
1909 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1910 * interface.
1911 */
1912 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1913
1914 /**
1915 * tomoyo_truncate - Truncate a line.
1916 *
1917 * @str: String to truncate.
1918 *
1919 * Returns length of truncated @str.
1920 */
1921 static int tomoyo_truncate(char *str)
1922 {
1923 char *start = str;
1924 while (*(unsigned char *) str > (unsigned char) ' ')
1925 str++;
1926 *str = '\0';
1927 return strlen(start) + 1;
1928 }
1929
1930 /**
1931 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1932 *
1933 * @domain: Pointer to "struct tomoyo_domain_info".
1934 * @header: Lines containing ACL.
1935 *
1936 * Returns nothing.
1937 */
1938 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1939 {
1940 char *buffer;
1941 char *realpath = NULL;
1942 char *argv0 = NULL;
1943 char *symlink = NULL;
1944 char *cp = strchr(header, '\n');
1945 int len;
1946 if (!cp)
1947 return;
1948 cp = strchr(cp + 1, '\n');
1949 if (!cp)
1950 return;
1951 *cp++ = '\0';
1952 len = strlen(cp) + 1;
1953 /* strstr() will return NULL if ordering is wrong. */
1954 if (*cp == 'f') {
1955 argv0 = strstr(header, " argv[]={ \"");
1956 if (argv0) {
1957 argv0 += 10;
1958 len += tomoyo_truncate(argv0) + 14;
1959 }
1960 realpath = strstr(header, " exec={ realpath=\"");
1961 if (realpath) {
1962 realpath += 8;
1963 len += tomoyo_truncate(realpath) + 6;
1964 }
1965 symlink = strstr(header, " symlink.target=\"");
1966 if (symlink)
1967 len += tomoyo_truncate(symlink + 1) + 1;
1968 }
1969 buffer = kmalloc(len, GFP_NOFS);
1970 if (!buffer)
1971 return;
1972 snprintf(buffer, len - 1, "%s", cp);
1973 if (realpath)
1974 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1975 if (argv0)
1976 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1977 if (symlink)
1978 tomoyo_addprintf(buffer, len, "%s", symlink);
1979 tomoyo_normalize_line(buffer);
1980 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1981 false))
1982 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1983 kfree(buffer);
1984 }
1985
1986 /**
1987 * tomoyo_supervisor - Ask for the supervisor's decision.
1988 *
1989 * @r: Pointer to "struct tomoyo_request_info".
1990 * @fmt: The printf()'s format string, followed by parameters.
1991 *
1992 * Returns 0 if the supervisor decided to permit the access request which
1993 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1994 * supervisor decided to retry the access request which violated the policy in
1995 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1996 */
1997 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1998 {
1999 va_list args;
2000 int error;
2001 int len;
2002 static unsigned int tomoyo_serial;
2003 struct tomoyo_query entry = { };
2004 bool quota_exceeded = false;
2005 va_start(args, fmt);
2006 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2007 va_end(args);
2008 /* Write /sys/kernel/security/tomoyo/audit. */
2009 va_start(args, fmt);
2010 tomoyo_write_log2(r, len, fmt, args);
2011 va_end(args);
2012 /* Nothing more to do if granted. */
2013 if (r->granted)
2014 return 0;
2015 if (r->mode)
2016 tomoyo_update_stat(r->mode);
2017 switch (r->mode) {
2018 case TOMOYO_CONFIG_ENFORCING:
2019 error = -EPERM;
2020 if (atomic_read(&tomoyo_query_observers))
2021 break;
2022 goto out;
2023 case TOMOYO_CONFIG_LEARNING:
2024 error = 0;
2025 /* Check max_learning_entry parameter. */
2026 if (tomoyo_domain_quota_is_ok(r))
2027 break;
2028 /* fall through */
2029 default:
2030 return 0;
2031 }
2032 /* Get message. */
2033 va_start(args, fmt);
2034 entry.query = tomoyo_init_log(r, len, fmt, args);
2035 va_end(args);
2036 if (!entry.query)
2037 goto out;
2038 entry.query_len = strlen(entry.query) + 1;
2039 if (!error) {
2040 tomoyo_add_entry(r->domain, entry.query);
2041 goto out;
2042 }
2043 len = tomoyo_round2(entry.query_len);
2044 spin_lock(&tomoyo_query_list_lock);
2045 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2046 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2047 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2048 quota_exceeded = true;
2049 } else {
2050 entry.serial = tomoyo_serial++;
2051 entry.retry = r->retry;
2052 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2053 list_add_tail(&entry.list, &tomoyo_query_list);
2054 }
2055 spin_unlock(&tomoyo_query_list_lock);
2056 if (quota_exceeded)
2057 goto out;
2058 /* Give 10 seconds for supervisor's opinion. */
2059 while (entry.timer < 10) {
2060 wake_up_all(&tomoyo_query_wait);
2061 if (wait_event_interruptible_timeout
2062 (tomoyo_answer_wait, entry.answer ||
2063 !atomic_read(&tomoyo_query_observers), HZ))
2064 break;
2065 else
2066 entry.timer++;
2067 }
2068 spin_lock(&tomoyo_query_list_lock);
2069 list_del(&entry.list);
2070 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2071 spin_unlock(&tomoyo_query_list_lock);
2072 switch (entry.answer) {
2073 case 3: /* Asked to retry by administrator. */
2074 error = TOMOYO_RETRY_REQUEST;
2075 r->retry++;
2076 break;
2077 case 1:
2078 /* Granted by administrator. */
2079 error = 0;
2080 break;
2081 default:
2082 /* Timed out or rejected by administrator. */
2083 break;
2084 }
2085 out:
2086 kfree(entry.query);
2087 return error;
2088 }
2089
2090 /**
2091 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2092 *
2093 * @file: Pointer to "struct file".
2094 * @wait: Pointer to "poll_table".
2095 *
2096 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2097 *
2098 * Waits for access requests which violated policy in enforcing mode.
2099 */
2100 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2101 {
2102 struct list_head *tmp;
2103 bool found = false;
2104 u8 i;
2105 for (i = 0; i < 2; i++) {
2106 spin_lock(&tomoyo_query_list_lock);
2107 list_for_each(tmp, &tomoyo_query_list) {
2108 struct tomoyo_query *ptr =
2109 list_entry(tmp, typeof(*ptr), list);
2110 if (ptr->answer)
2111 continue;
2112 found = true;
2113 break;
2114 }
2115 spin_unlock(&tomoyo_query_list_lock);
2116 if (found)
2117 return POLLIN | POLLRDNORM;
2118 if (i)
2119 break;
2120 poll_wait(file, &tomoyo_query_wait, wait);
2121 }
2122 return 0;
2123 }
2124
2125 /**
2126 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2127 *
2128 * @head: Pointer to "struct tomoyo_io_buffer".
2129 */
2130 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2131 {
2132 struct list_head *tmp;
2133 unsigned int pos = 0;
2134 size_t len = 0;
2135 char *buf;
2136 if (head->r.w_pos)
2137 return;
2138 if (head->read_buf) {
2139 kfree(head->read_buf);
2140 head->read_buf = NULL;
2141 }
2142 spin_lock(&tomoyo_query_list_lock);
2143 list_for_each(tmp, &tomoyo_query_list) {
2144 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2145 if (ptr->answer)
2146 continue;
2147 if (pos++ != head->r.query_index)
2148 continue;
2149 len = ptr->query_len;
2150 break;
2151 }
2152 spin_unlock(&tomoyo_query_list_lock);
2153 if (!len) {
2154 head->r.query_index = 0;
2155 return;
2156 }
2157 buf = kzalloc(len + 32, GFP_NOFS);
2158 if (!buf)
2159 return;
2160 pos = 0;
2161 spin_lock(&tomoyo_query_list_lock);
2162 list_for_each(tmp, &tomoyo_query_list) {
2163 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2164 if (ptr->answer)
2165 continue;
2166 if (pos++ != head->r.query_index)
2167 continue;
2168 /*
2169 * Some query can be skipped because tomoyo_query_list
2170 * can change, but I don't care.
2171 */
2172 if (len == ptr->query_len)
2173 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2174 ptr->retry, ptr->query);
2175 break;
2176 }
2177 spin_unlock(&tomoyo_query_list_lock);
2178 if (buf[0]) {
2179 head->read_buf = buf;
2180 head->r.w[head->r.w_pos++] = buf;
2181 head->r.query_index++;
2182 } else {
2183 kfree(buf);
2184 }
2185 }
2186
2187 /**
2188 * tomoyo_write_answer - Write the supervisor's decision.
2189 *
2190 * @head: Pointer to "struct tomoyo_io_buffer".
2191 *
2192 * Returns 0 on success, -EINVAL otherwise.
2193 */
2194 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2195 {
2196 char *data = head->write_buf;
2197 struct list_head *tmp;
2198 unsigned int serial;
2199 unsigned int answer;
2200 spin_lock(&tomoyo_query_list_lock);
2201 list_for_each(tmp, &tomoyo_query_list) {
2202 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2203 ptr->timer = 0;
2204 }
2205 spin_unlock(&tomoyo_query_list_lock);
2206 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2207 return -EINVAL;
2208 spin_lock(&tomoyo_query_list_lock);
2209 list_for_each(tmp, &tomoyo_query_list) {
2210 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2211 if (ptr->serial != serial)
2212 continue;
2213 if (!ptr->answer)
2214 ptr->answer = answer;
2215 break;
2216 }
2217 spin_unlock(&tomoyo_query_list_lock);
2218 return 0;
2219 }
2220
2221 /**
2222 * tomoyo_read_version: Get version.
2223 *
2224 * @head: Pointer to "struct tomoyo_io_buffer".
2225 *
2226 * Returns version information.
2227 */
2228 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2229 {
2230 if (!head->r.eof) {
2231 tomoyo_io_printf(head, "2.5.0");
2232 head->r.eof = true;
2233 }
2234 }
2235
2236 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2237 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2238 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2239 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2240 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2241 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2242 };
2243
2244 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2245 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2246 [TOMOYO_MEMORY_POLICY] = "policy:",
2247 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2248 [TOMOYO_MEMORY_QUERY] = "query message:",
2249 };
2250
2251 /* Timestamp counter for last updated. */
2252 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2253 /* Counter for number of updates. */
2254 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2255
2256 /**
2257 * tomoyo_update_stat - Update statistic counters.
2258 *
2259 * @index: Index for policy type.
2260 *
2261 * Returns nothing.
2262 */
2263 void tomoyo_update_stat(const u8 index)
2264 {
2265 struct timeval tv;
2266 do_gettimeofday(&tv);
2267 /*
2268 * I don't use atomic operations because race condition is not fatal.
2269 */
2270 tomoyo_stat_updated[index]++;
2271 tomoyo_stat_modified[index] = tv.tv_sec;
2272 }
2273
2274 /**
2275 * tomoyo_read_stat - Read statistic data.
2276 *
2277 * @head: Pointer to "struct tomoyo_io_buffer".
2278 *
2279 * Returns nothing.
2280 */
2281 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2282 {
2283 u8 i;
2284 unsigned int total = 0;
2285 if (head->r.eof)
2286 return;
2287 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2288 tomoyo_io_printf(head, "Policy %-30s %10u",
2289 tomoyo_policy_headers[i],
2290 tomoyo_stat_updated[i]);
2291 if (tomoyo_stat_modified[i]) {
2292 struct tomoyo_time stamp;
2293 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2294 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2295 "%02u:%02u:%02u)",
2296 stamp.year, stamp.month, stamp.day,
2297 stamp.hour, stamp.min, stamp.sec);
2298 }
2299 tomoyo_set_lf(head);
2300 }
2301 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2302 unsigned int used = tomoyo_memory_used[i];
2303 total += used;
2304 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2305 tomoyo_memory_headers[i], used);
2306 used = tomoyo_memory_quota[i];
2307 if (used)
2308 tomoyo_io_printf(head, " (Quota: %10u)", used);
2309 tomoyo_set_lf(head);
2310 }
2311 tomoyo_io_printf(head, "Total memory used: %10u\n",
2312 total);
2313 head->r.eof = true;
2314 }
2315
2316 /**
2317 * tomoyo_write_stat - Set memory quota.
2318 *
2319 * @head: Pointer to "struct tomoyo_io_buffer".
2320 *
2321 * Returns 0.
2322 */
2323 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2324 {
2325 char *data = head->write_buf;
2326 u8 i;
2327 if (tomoyo_str_starts(&data, "Memory used by "))
2328 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2329 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2330 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2331 return 0;
2332 }
2333
2334 /**
2335 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2336 *
2337 * @type: Type of interface.
2338 * @file: Pointer to "struct file".
2339 *
2340 * Returns 0 on success, negative value otherwise.
2341 */
2342 int tomoyo_open_control(const u8 type, struct file *file)
2343 {
2344 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2345
2346 if (!head)
2347 return -ENOMEM;
2348 mutex_init(&head->io_sem);
2349 head->type = type;
2350 switch (type) {
2351 case TOMOYO_DOMAINPOLICY:
2352 /* /sys/kernel/security/tomoyo/domain_policy */
2353 head->write = tomoyo_write_domain;
2354 head->read = tomoyo_read_domain;
2355 break;
2356 case TOMOYO_EXCEPTIONPOLICY:
2357 /* /sys/kernel/security/tomoyo/exception_policy */
2358 head->write = tomoyo_write_exception;
2359 head->read = tomoyo_read_exception;
2360 break;
2361 case TOMOYO_AUDIT:
2362 /* /sys/kernel/security/tomoyo/audit */
2363 head->poll = tomoyo_poll_log;
2364 head->read = tomoyo_read_log;
2365 break;
2366 case TOMOYO_PROCESS_STATUS:
2367 /* /sys/kernel/security/tomoyo/.process_status */
2368 head->write = tomoyo_write_pid;
2369 head->read = tomoyo_read_pid;
2370 break;
2371 case TOMOYO_VERSION:
2372 /* /sys/kernel/security/tomoyo/version */
2373 head->read = tomoyo_read_version;
2374 head->readbuf_size = 128;
2375 break;
2376 case TOMOYO_STAT:
2377 /* /sys/kernel/security/tomoyo/stat */
2378 head->write = tomoyo_write_stat;
2379 head->read = tomoyo_read_stat;
2380 head->readbuf_size = 1024;
2381 break;
2382 case TOMOYO_PROFILE:
2383 /* /sys/kernel/security/tomoyo/profile */
2384 head->write = tomoyo_write_profile;
2385 head->read = tomoyo_read_profile;
2386 break;
2387 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2388 head->poll = tomoyo_poll_query;
2389 head->write = tomoyo_write_answer;
2390 head->read = tomoyo_read_query;
2391 break;
2392 case TOMOYO_MANAGER:
2393 /* /sys/kernel/security/tomoyo/manager */
2394 head->write = tomoyo_write_manager;
2395 head->read = tomoyo_read_manager;
2396 break;
2397 }
2398 if (!(file->f_mode & FMODE_READ)) {
2399 /*
2400 * No need to allocate read_buf since it is not opened
2401 * for reading.
2402 */
2403 head->read = NULL;
2404 head->poll = NULL;
2405 } else if (!head->poll) {
2406 /* Don't allocate read_buf for poll() access. */
2407 if (!head->readbuf_size)
2408 head->readbuf_size = 4096 * 2;
2409 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2410 if (!head->read_buf) {
2411 kfree(head);
2412 return -ENOMEM;
2413 }
2414 }
2415 if (!(file->f_mode & FMODE_WRITE)) {
2416 /*
2417 * No need to allocate write_buf since it is not opened
2418 * for writing.
2419 */
2420 head->write = NULL;
2421 } else if (head->write) {
2422 head->writebuf_size = 4096 * 2;
2423 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2424 if (!head->write_buf) {
2425 kfree(head->read_buf);
2426 kfree(head);
2427 return -ENOMEM;
2428 }
2429 }
2430 /*
2431 * If the file is /sys/kernel/security/tomoyo/query , increment the
2432 * observer counter.
2433 * The obserber counter is used by tomoyo_supervisor() to see if
2434 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2435 */
2436 if (type == TOMOYO_QUERY)
2437 atomic_inc(&tomoyo_query_observers);
2438 file->private_data = head;
2439 tomoyo_notify_gc(head, true);
2440 return 0;
2441 }
2442
2443 /**
2444 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2445 *
2446 * @file: Pointer to "struct file".
2447 * @wait: Pointer to "poll_table".
2448 *
2449 * Waits for read readiness.
2450 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2451 * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2452 */
2453 int tomoyo_poll_control(struct file *file, poll_table *wait)
2454 {
2455 struct tomoyo_io_buffer *head = file->private_data;
2456 if (!head->poll)
2457 return -ENOSYS;
2458 return head->poll(file, wait);
2459 }
2460
2461 /**
2462 * tomoyo_set_namespace_cursor - Set namespace to read.
2463 *
2464 * @head: Pointer to "struct tomoyo_io_buffer".
2465 *
2466 * Returns nothing.
2467 */
2468 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2469 {
2470 struct list_head *ns;
2471 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2472 head->type != TOMOYO_PROFILE)
2473 return;
2474 /*
2475 * If this is the first read, or reading previous namespace finished
2476 * and has more namespaces to read, update the namespace cursor.
2477 */
2478 ns = head->r.ns;
2479 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2480 /* Clearing is OK because tomoyo_flush() returned true. */
2481 memset(&head->r, 0, sizeof(head->r));
2482 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2483 }
2484 }
2485
2486 /**
2487 * tomoyo_has_more_namespace - Check for unread namespaces.
2488 *
2489 * @head: Pointer to "struct tomoyo_io_buffer".
2490 *
2491 * Returns true if we have more entries to print, false otherwise.
2492 */
2493 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2494 {
2495 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2496 head->type == TOMOYO_PROFILE) && head->r.eof &&
2497 head->r.ns->next != &tomoyo_namespace_list;
2498 }
2499
2500 /**
2501 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2502 *
2503 * @head: Pointer to "struct tomoyo_io_buffer".
2504 * @buffer: Poiner to buffer to write to.
2505 * @buffer_len: Size of @buffer.
2506 *
2507 * Returns bytes read on success, negative value otherwise.
2508 */
2509 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2510 const int buffer_len)
2511 {
2512 int len;
2513 int idx;
2514
2515 if (!head->read)
2516 return -ENOSYS;
2517 if (mutex_lock_interruptible(&head->io_sem))
2518 return -EINTR;
2519 head->read_user_buf = buffer;
2520 head->read_user_buf_avail = buffer_len;
2521 idx = tomoyo_read_lock();
2522 if (tomoyo_flush(head))
2523 /* Call the policy handler. */
2524 do {
2525 tomoyo_set_namespace_cursor(head);
2526 head->read(head);
2527 } while (tomoyo_flush(head) &&
2528 tomoyo_has_more_namespace(head));
2529 tomoyo_read_unlock(idx);
2530 len = head->read_user_buf - buffer;
2531 mutex_unlock(&head->io_sem);
2532 return len;
2533 }
2534
2535 /**
2536 * tomoyo_parse_policy - Parse a policy line.
2537 *
2538 * @head: Poiter to "struct tomoyo_io_buffer".
2539 * @line: Line to parse.
2540 *
2541 * Returns 0 on success, negative value otherwise.
2542 *
2543 * Caller holds tomoyo_read_lock().
2544 */
2545 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2546 {
2547 /* Delete request? */
2548 head->w.is_delete = !strncmp(line, "delete ", 7);
2549 if (head->w.is_delete)
2550 memmove(line, line + 7, strlen(line + 7) + 1);
2551 /* Selecting namespace to update. */
2552 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2553 head->type == TOMOYO_PROFILE) {
2554 if (*line == '<') {
2555 char *cp = strchr(line, ' ');
2556 if (cp) {
2557 *cp++ = '\0';
2558 head->w.ns = tomoyo_assign_namespace(line);
2559 memmove(line, cp, strlen(cp) + 1);
2560 } else
2561 head->w.ns = NULL;
2562 } else
2563 head->w.ns = &tomoyo_kernel_namespace;
2564 /* Don't allow updating if namespace is invalid. */
2565 if (!head->w.ns)
2566 return -ENOENT;
2567 }
2568 /* Do the update. */
2569 return head->write(head);
2570 }
2571
2572 /**
2573 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2574 *
2575 * @head: Pointer to "struct tomoyo_io_buffer".
2576 * @buffer: Pointer to buffer to read from.
2577 * @buffer_len: Size of @buffer.
2578 *
2579 * Returns @buffer_len on success, negative value otherwise.
2580 */
2581 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2582 const char __user *buffer, const int buffer_len)
2583 {
2584 int error = buffer_len;
2585 size_t avail_len = buffer_len;
2586 char *cp0 = head->write_buf;
2587 int idx;
2588 if (!head->write)
2589 return -ENOSYS;
2590 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2591 return -EFAULT;
2592 if (mutex_lock_interruptible(&head->io_sem))
2593 return -EINTR;
2594 head->read_user_buf_avail = 0;
2595 idx = tomoyo_read_lock();
2596 /* Read a line and dispatch it to the policy handler. */
2597 while (avail_len > 0) {
2598 char c;
2599 if (head->w.avail >= head->writebuf_size - 1) {
2600 const int len = head->writebuf_size * 2;
2601 char *cp = kzalloc(len, GFP_NOFS);
2602 if (!cp) {
2603 error = -ENOMEM;
2604 break;
2605 }
2606 memmove(cp, cp0, head->w.avail);
2607 kfree(cp0);
2608 head->write_buf = cp;
2609 cp0 = cp;
2610 head->writebuf_size = len;
2611 }
2612 if (get_user(c, buffer)) {
2613 error = -EFAULT;
2614 break;
2615 }
2616 buffer++;
2617 avail_len--;
2618 cp0[head->w.avail++] = c;
2619 if (c != '\n')
2620 continue;
2621 cp0[head->w.avail - 1] = '\0';
2622 head->w.avail = 0;
2623 tomoyo_normalize_line(cp0);
2624 if (!strcmp(cp0, "reset")) {
2625 head->w.ns = &tomoyo_kernel_namespace;
2626 head->w.domain = NULL;
2627 memset(&head->r, 0, sizeof(head->r));
2628 continue;
2629 }
2630 /* Don't allow updating policies by non manager programs. */
2631 switch (head->type) {
2632 case TOMOYO_PROCESS_STATUS:
2633 /* This does not write anything. */
2634 break;
2635 case TOMOYO_DOMAINPOLICY:
2636 if (tomoyo_select_domain(head, cp0))
2637 continue;
2638 /* fall through */
2639 case TOMOYO_EXCEPTIONPOLICY:
2640 if (!strcmp(cp0, "select transition_only")) {
2641 head->r.print_transition_related_only = true;
2642 continue;
2643 }
2644 /* fall through */
2645 default:
2646 if (!tomoyo_manager()) {
2647 error = -EPERM;
2648 goto out;
2649 }
2650 }
2651 switch (tomoyo_parse_policy(head, cp0)) {
2652 case -EPERM:
2653 error = -EPERM;
2654 goto out;
2655 case 0:
2656 switch (head->type) {
2657 case TOMOYO_DOMAINPOLICY:
2658 case TOMOYO_EXCEPTIONPOLICY:
2659 case TOMOYO_STAT:
2660 case TOMOYO_PROFILE:
2661 case TOMOYO_MANAGER:
2662 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2663 break;
2664 default:
2665 break;
2666 }
2667 break;
2668 }
2669 }
2670 out:
2671 tomoyo_read_unlock(idx);
2672 mutex_unlock(&head->io_sem);
2673 return error;
2674 }
2675
2676 /**
2677 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2678 *
2679 * @head: Pointer to "struct tomoyo_io_buffer".
2680 *
2681 * Returns 0.
2682 */
2683 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2684 {
2685 /*
2686 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2687 * observer counter.
2688 */
2689 if (head->type == TOMOYO_QUERY &&
2690 atomic_dec_and_test(&tomoyo_query_observers))
2691 wake_up_all(&tomoyo_answer_wait);
2692 tomoyo_notify_gc(head, false);
2693 return 0;
2694 }
2695
2696 /**
2697 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2698 */
2699 void tomoyo_check_profile(void)
2700 {
2701 struct tomoyo_domain_info *domain;
2702 const int idx = tomoyo_read_lock();
2703 tomoyo_policy_loaded = true;
2704 printk(KERN_INFO "TOMOYO: 2.5.0\n");
2705 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2706 const u8 profile = domain->profile;
2707 const struct tomoyo_policy_namespace *ns = domain->ns;
2708 if (ns->profile_version != 20110903)
2709 printk(KERN_ERR
2710 "Profile version %u is not supported.\n",
2711 ns->profile_version);
2712 else if (!ns->profile_ptr[profile])
2713 printk(KERN_ERR
2714 "Profile %u (used by '%s') is not defined.\n",
2715 profile, domain->domainname->name);
2716 else
2717 continue;
2718 printk(KERN_ERR
2719 "Userland tools for TOMOYO 2.5 must be installed and "
2720 "policy must be initialized.\n");
2721 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2722 "for more information.\n");
2723 panic("STOP!");
2724 }
2725 tomoyo_read_unlock(idx);
2726 printk(KERN_INFO "Mandatory Access Control activated.\n");
2727 }
2728
2729 /**
2730 * tomoyo_load_builtin_policy - Load built-in policy.
2731 *
2732 * Returns nothing.
2733 */
2734 void __init tomoyo_load_builtin_policy(void)
2735 {
2736 /*
2737 * This include file is manually created and contains built-in policy
2738 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2739 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2740 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2741 */
2742 #include "builtin-policy.h"
2743 u8 i;
2744 const int idx = tomoyo_read_lock();
2745 for (i = 0; i < 5; i++) {
2746 struct tomoyo_io_buffer head = { };
2747 char *start = "";
2748 switch (i) {
2749 case 0:
2750 start = tomoyo_builtin_profile;
2751 head.type = TOMOYO_PROFILE;
2752 head.write = tomoyo_write_profile;
2753 break;
2754 case 1:
2755 start = tomoyo_builtin_exception_policy;
2756 head.type = TOMOYO_EXCEPTIONPOLICY;
2757 head.write = tomoyo_write_exception;
2758 break;
2759 case 2:
2760 start = tomoyo_builtin_domain_policy;
2761 head.type = TOMOYO_DOMAINPOLICY;
2762 head.write = tomoyo_write_domain;
2763 break;
2764 case 3:
2765 start = tomoyo_builtin_manager;
2766 head.type = TOMOYO_MANAGER;
2767 head.write = tomoyo_write_manager;
2768 break;
2769 case 4:
2770 start = tomoyo_builtin_stat;
2771 head.type = TOMOYO_STAT;
2772 head.write = tomoyo_write_stat;
2773 break;
2774 }
2775 while (1) {
2776 char *end = strchr(start, '\n');
2777 if (!end)
2778 break;
2779 *end = '\0';
2780 tomoyo_normalize_line(start);
2781 head.write_buf = start;
2782 tomoyo_parse_policy(&head, start);
2783 start = end + 1;
2784 }
2785 }
2786 tomoyo_read_unlock(idx);
2787 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2788 tomoyo_check_profile();
2789 #endif
2790 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree