1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * security/tomoyo/common.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8 #include <linux/uaccess.h>
9 #include <linux/slab.h>
10 #include <linux/security.h>
11 #include "common.h"
12
13 /* String table for operation mode. */
14 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
15 [TOMOYO_CONFIG_DISABLED] = "disabled",
16 [TOMOYO_CONFIG_LEARNING] = "learning",
17 [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
18 [TOMOYO_CONFIG_ENFORCING] = "enforcing"
19 };
20
21 /* String table for /sys/kernel/security/tomoyo/profile */
22 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
23 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
24 /* CONFIG::file group */
25 [TOMOYO_MAC_FILE_EXECUTE] = "execute",
26 [TOMOYO_MAC_FILE_OPEN] = "open",
27 [TOMOYO_MAC_FILE_CREATE] = "create",
28 [TOMOYO_MAC_FILE_UNLINK] = "unlink",
29 [TOMOYO_MAC_FILE_GETATTR] = "getattr",
30 [TOMOYO_MAC_FILE_MKDIR] = "mkdir",
31 [TOMOYO_MAC_FILE_RMDIR] = "rmdir",
32 [TOMOYO_MAC_FILE_MKFIFO] = "mkfifo",
33 [TOMOYO_MAC_FILE_MKSOCK] = "mksock",
34 [TOMOYO_MAC_FILE_TRUNCATE] = "truncate",
35 [TOMOYO_MAC_FILE_SYMLINK] = "symlink",
36 [TOMOYO_MAC_FILE_MKBLOCK] = "mkblock",
37 [TOMOYO_MAC_FILE_MKCHAR] = "mkchar",
38 [TOMOYO_MAC_FILE_LINK] = "link",
39 [TOMOYO_MAC_FILE_RENAME] = "rename",
40 [TOMOYO_MAC_FILE_CHMOD] = "chmod",
41 [TOMOYO_MAC_FILE_CHOWN] = "chown",
42 [TOMOYO_MAC_FILE_CHGRP] = "chgrp",
43 [TOMOYO_MAC_FILE_IOCTL] = "ioctl",
44 [TOMOYO_MAC_FILE_CHROOT] = "chroot",
45 [TOMOYO_MAC_FILE_MOUNT] = "mount",
46 [TOMOYO_MAC_FILE_UMOUNT] = "unmount",
47 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
48 /* CONFIG::network group */
49 [TOMOYO_MAC_NETWORK_INET_STREAM_BIND] = "inet_stream_bind",
50 [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN] = "inet_stream_listen",
51 [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT] = "inet_stream_connect",
52 [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND] = "inet_dgram_bind",
53 [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND] = "inet_dgram_send",
54 [TOMOYO_MAC_NETWORK_INET_RAW_BIND] = "inet_raw_bind",
55 [TOMOYO_MAC_NETWORK_INET_RAW_SEND] = "inet_raw_send",
56 [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND] = "unix_stream_bind",
57 [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN] = "unix_stream_listen",
58 [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT] = "unix_stream_connect",
59 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND] = "unix_dgram_bind",
60 [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND] = "unix_dgram_send",
61 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND] = "unix_seqpacket_bind",
62 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN] = "unix_seqpacket_listen",
63 [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
64 /* CONFIG::misc group */
65 [TOMOYO_MAC_ENVIRON] = "env",
66 /* CONFIG group */
67 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
68 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
69 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
70 };
71
72 /* String table for conditions. */
73 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
74 [TOMOYO_TASK_UID] = "task.uid",
75 [TOMOYO_TASK_EUID] = "task.euid",
76 [TOMOYO_TASK_SUID] = "task.suid",
77 [TOMOYO_TASK_FSUID] = "task.fsuid",
78 [TOMOYO_TASK_GID] = "task.gid",
79 [TOMOYO_TASK_EGID] = "task.egid",
80 [TOMOYO_TASK_SGID] = "task.sgid",
81 [TOMOYO_TASK_FSGID] = "task.fsgid",
82 [TOMOYO_TASK_PID] = "task.pid",
83 [TOMOYO_TASK_PPID] = "task.ppid",
84 [TOMOYO_EXEC_ARGC] = "exec.argc",
85 [TOMOYO_EXEC_ENVC] = "exec.envc",
86 [TOMOYO_TYPE_IS_SOCKET] = "socket",
87 [TOMOYO_TYPE_IS_SYMLINK] = "symlink",
88 [TOMOYO_TYPE_IS_FILE] = "file",
89 [TOMOYO_TYPE_IS_BLOCK_DEV] = "block",
90 [TOMOYO_TYPE_IS_DIRECTORY] = "directory",
91 [TOMOYO_TYPE_IS_CHAR_DEV] = "char",
92 [TOMOYO_TYPE_IS_FIFO] = "fifo",
93 [TOMOYO_MODE_SETUID] = "setuid",
94 [TOMOYO_MODE_SETGID] = "setgid",
95 [TOMOYO_MODE_STICKY] = "sticky",
96 [TOMOYO_MODE_OWNER_READ] = "owner_read",
97 [TOMOYO_MODE_OWNER_WRITE] = "owner_write",
98 [TOMOYO_MODE_OWNER_EXECUTE] = "owner_execute",
99 [TOMOYO_MODE_GROUP_READ] = "group_read",
100 [TOMOYO_MODE_GROUP_WRITE] = "group_write",
101 [TOMOYO_MODE_GROUP_EXECUTE] = "group_execute",
102 [TOMOYO_MODE_OTHERS_READ] = "others_read",
103 [TOMOYO_MODE_OTHERS_WRITE] = "others_write",
104 [TOMOYO_MODE_OTHERS_EXECUTE] = "others_execute",
105 [TOMOYO_EXEC_REALPATH] = "exec.realpath",
106 [TOMOYO_SYMLINK_TARGET] = "symlink.target",
107 [TOMOYO_PATH1_UID] = "path1.uid",
108 [TOMOYO_PATH1_GID] = "path1.gid",
109 [TOMOYO_PATH1_INO] = "path1.ino",
110 [TOMOYO_PATH1_MAJOR] = "path1.major",
111 [TOMOYO_PATH1_MINOR] = "path1.minor",
112 [TOMOYO_PATH1_PERM] = "path1.perm",
113 [TOMOYO_PATH1_TYPE] = "path1.type",
114 [TOMOYO_PATH1_DEV_MAJOR] = "path1.dev_major",
115 [TOMOYO_PATH1_DEV_MINOR] = "path1.dev_minor",
116 [TOMOYO_PATH2_UID] = "path2.uid",
117 [TOMOYO_PATH2_GID] = "path2.gid",
118 [TOMOYO_PATH2_INO] = "path2.ino",
119 [TOMOYO_PATH2_MAJOR] = "path2.major",
120 [TOMOYO_PATH2_MINOR] = "path2.minor",
121 [TOMOYO_PATH2_PERM] = "path2.perm",
122 [TOMOYO_PATH2_TYPE] = "path2.type",
123 [TOMOYO_PATH2_DEV_MAJOR] = "path2.dev_major",
124 [TOMOYO_PATH2_DEV_MINOR] = "path2.dev_minor",
125 [TOMOYO_PATH1_PARENT_UID] = "path1.parent.uid",
126 [TOMOYO_PATH1_PARENT_GID] = "path1.parent.gid",
127 [TOMOYO_PATH1_PARENT_INO] = "path1.parent.ino",
128 [TOMOYO_PATH1_PARENT_PERM] = "path1.parent.perm",
129 [TOMOYO_PATH2_PARENT_UID] = "path2.parent.uid",
130 [TOMOYO_PATH2_PARENT_GID] = "path2.parent.gid",
131 [TOMOYO_PATH2_PARENT_INO] = "path2.parent.ino",
132 [TOMOYO_PATH2_PARENT_PERM] = "path2.parent.perm",
133 };
134
135 /* String table for PREFERENCE keyword. */
136 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
137 [TOMOYO_PREF_MAX_AUDIT_LOG] = "max_audit_log",
138 [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
139 };
140
141 /* String table for path operation. */
142 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
143 [TOMOYO_TYPE_EXECUTE] = "execute",
144 [TOMOYO_TYPE_READ] = "read",
145 [TOMOYO_TYPE_WRITE] = "write",
146 [TOMOYO_TYPE_APPEND] = "append",
147 [TOMOYO_TYPE_UNLINK] = "unlink",
148 [TOMOYO_TYPE_GETATTR] = "getattr",
149 [TOMOYO_TYPE_RMDIR] = "rmdir",
150 [TOMOYO_TYPE_TRUNCATE] = "truncate",
151 [TOMOYO_TYPE_SYMLINK] = "symlink",
152 [TOMOYO_TYPE_CHROOT] = "chroot",
153 [TOMOYO_TYPE_UMOUNT] = "unmount",
154 };
155
156 /* String table for socket's operation. */
157 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
158 [TOMOYO_NETWORK_BIND] = "bind",
159 [TOMOYO_NETWORK_LISTEN] = "listen",
160 [TOMOYO_NETWORK_CONNECT] = "connect",
161 [TOMOYO_NETWORK_SEND] = "send",
162 };
163
164 /* String table for categories. */
165 static const char * const tomoyo_category_keywords
166 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
167 [TOMOYO_MAC_CATEGORY_FILE] = "file",
168 [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
169 [TOMOYO_MAC_CATEGORY_MISC] = "misc",
170 };
171
172 /* Permit policy management by non-root user? */
173 static bool tomoyo_manage_by_non_root;
174
175 /* Utility functions. */
176
177 /**
178 * tomoyo_yesno - Return "yes" or "no".
179 *
180 * @value: Bool value.
181 */
tomoyo_yesno(const unsigned int value)182 const char *tomoyo_yesno(const unsigned int value)
183 {
184 return value ? "yes" : "no";
185 }
186
187 /**
188 * tomoyo_addprintf - strncat()-like-snprintf().
189 *
190 * @buffer: Buffer to write to. Must be '\0'-terminated.
191 * @len: Size of @buffer.
192 * @fmt: The printf()'s format string, followed by parameters.
193 *
194 * Returns nothing.
195 */
tomoyo_addprintf(char * buffer,int len,const char * fmt,...)196 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
197 {
198 va_list args;
199 const int pos = strlen(buffer);
200
201 va_start(args, fmt);
202 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
203 va_end(args);
204 }
205
206 /**
207 * tomoyo_flush - Flush queued string to userspace's buffer.
208 *
209 * @head: Pointer to "struct tomoyo_io_buffer".
210 *
211 * Returns true if all data was flushed, false otherwise.
212 */
tomoyo_flush(struct tomoyo_io_buffer * head)213 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
214 {
215 while (head->r.w_pos) {
216 const char *w = head->r.w[0];
217 size_t len = strlen(w);
218
219 if (len) {
220 if (len > head->read_user_buf_avail)
221 len = head->read_user_buf_avail;
222 if (!len)
223 return false;
224 if (copy_to_user(head->read_user_buf, w, len))
225 return false;
226 head->read_user_buf_avail -= len;
227 head->read_user_buf += len;
228 w += len;
229 }
230 head->r.w[0] = w;
231 if (*w)
232 return false;
233 /* Add '\0' for audit logs and query. */
234 if (head->poll) {
235 if (!head->read_user_buf_avail ||
236 copy_to_user(head->read_user_buf, "", 1))
237 return false;
238 head->read_user_buf_avail--;
239 head->read_user_buf++;
240 }
241 head->r.w_pos--;
242 for (len = 0; len < head->r.w_pos; len++)
243 head->r.w[len] = head->r.w[len + 1];
244 }
245 head->r.avail = 0;
246 return true;
247 }
248
249 /**
250 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
251 *
252 * @head: Pointer to "struct tomoyo_io_buffer".
253 * @string: String to print.
254 *
255 * Note that @string has to be kept valid until @head is kfree()d.
256 * This means that char[] allocated on stack memory cannot be passed to
257 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
258 */
tomoyo_set_string(struct tomoyo_io_buffer * head,const char * string)259 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
260 {
261 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
262 head->r.w[head->r.w_pos++] = string;
263 tomoyo_flush(head);
264 } else
265 WARN_ON(1);
266 }
267
268 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
269 ...) __printf(2, 3);
270
271 /**
272 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
273 *
274 * @head: Pointer to "struct tomoyo_io_buffer".
275 * @fmt: The printf()'s format string, followed by parameters.
276 */
tomoyo_io_printf(struct tomoyo_io_buffer * head,const char * fmt,...)277 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
278 ...)
279 {
280 va_list args;
281 size_t len;
282 size_t pos = head->r.avail;
283 int size = head->readbuf_size - pos;
284
285 if (size <= 0)
286 return;
287 va_start(args, fmt);
288 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
289 va_end(args);
290 if (pos + len >= head->readbuf_size) {
291 WARN_ON(1);
292 return;
293 }
294 head->r.avail += len;
295 tomoyo_set_string(head, head->read_buf + pos);
296 }
297
298 /**
299 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
300 *
301 * @head: Pointer to "struct tomoyo_io_buffer".
302 *
303 * Returns nothing.
304 */
tomoyo_set_space(struct tomoyo_io_buffer * head)305 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
306 {
307 tomoyo_set_string(head, " ");
308 }
309
310 /**
311 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
312 *
313 * @head: Pointer to "struct tomoyo_io_buffer".
314 *
315 * Returns nothing.
316 */
tomoyo_set_lf(struct tomoyo_io_buffer * head)317 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
318 {
319 tomoyo_set_string(head, "\n");
320 return !head->r.w_pos;
321 }
322
323 /**
324 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
325 *
326 * @head: Pointer to "struct tomoyo_io_buffer".
327 *
328 * Returns nothing.
329 */
tomoyo_set_slash(struct tomoyo_io_buffer * head)330 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
331 {
332 tomoyo_set_string(head, "/");
333 }
334
335 /* List of namespaces. */
336 LIST_HEAD(tomoyo_namespace_list);
337 /* True if namespace other than tomoyo_kernel_namespace is defined. */
338 static bool tomoyo_namespace_enabled;
339
340 /**
341 * tomoyo_init_policy_namespace - Initialize namespace.
342 *
343 * @ns: Pointer to "struct tomoyo_policy_namespace".
344 *
345 * Returns nothing.
346 */
tomoyo_init_policy_namespace(struct tomoyo_policy_namespace * ns)347 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
348 {
349 unsigned int idx;
350
351 for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
352 INIT_LIST_HEAD(&ns->acl_group[idx]);
353 for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
354 INIT_LIST_HEAD(&ns->group_list[idx]);
355 for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
356 INIT_LIST_HEAD(&ns->policy_list[idx]);
357 ns->profile_version = 20150505;
358 tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
359 list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
360 }
361
362 /**
363 * tomoyo_print_namespace - Print namespace header.
364 *
365 * @head: Pointer to "struct tomoyo_io_buffer".
366 *
367 * Returns nothing.
368 */
tomoyo_print_namespace(struct tomoyo_io_buffer * head)369 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
370 {
371 if (!tomoyo_namespace_enabled)
372 return;
373 tomoyo_set_string(head,
374 container_of(head->r.ns,
375 struct tomoyo_policy_namespace,
376 namespace_list)->name);
377 tomoyo_set_space(head);
378 }
379
380 /**
381 * tomoyo_print_name_union - Print a tomoyo_name_union.
382 *
383 * @head: Pointer to "struct tomoyo_io_buffer".
384 * @ptr: Pointer to "struct tomoyo_name_union".
385 */
tomoyo_print_name_union(struct tomoyo_io_buffer * head,const struct tomoyo_name_union * ptr)386 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
387 const struct tomoyo_name_union *ptr)
388 {
389 tomoyo_set_space(head);
390 if (ptr->group) {
391 tomoyo_set_string(head, "@");
392 tomoyo_set_string(head, ptr->group->group_name->name);
393 } else {
394 tomoyo_set_string(head, ptr->filename->name);
395 }
396 }
397
398 /**
399 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
400 *
401 * @head: Pointer to "struct tomoyo_io_buffer".
402 * @ptr: Pointer to "struct tomoyo_name_union".
403 *
404 * Returns nothing.
405 */
tomoyo_print_name_union_quoted(struct tomoyo_io_buffer * head,const struct tomoyo_name_union * ptr)406 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
407 const struct tomoyo_name_union *ptr)
408 {
409 if (ptr->group) {
410 tomoyo_set_string(head, "@");
411 tomoyo_set_string(head, ptr->group->group_name->name);
412 } else {
413 tomoyo_set_string(head, "\"");
414 tomoyo_set_string(head, ptr->filename->name);
415 tomoyo_set_string(head, "\"");
416 }
417 }
418
419 /**
420 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
421 *
422 * @head: Pointer to "struct tomoyo_io_buffer".
423 * @ptr: Pointer to "struct tomoyo_number_union".
424 *
425 * Returns nothing.
426 */
tomoyo_print_number_union_nospace(struct tomoyo_io_buffer * head,const struct tomoyo_number_union * ptr)427 static void tomoyo_print_number_union_nospace
428 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
429 {
430 if (ptr->group) {
431 tomoyo_set_string(head, "@");
432 tomoyo_set_string(head, ptr->group->group_name->name);
433 } else {
434 int i;
435 unsigned long min = ptr->values[0];
436 const unsigned long max = ptr->values[1];
437 u8 min_type = ptr->value_type[0];
438 const u8 max_type = ptr->value_type[1];
439 char buffer[128];
440
441 buffer[0] = '\0';
442 for (i = 0; i < 2; i++) {
443 switch (min_type) {
444 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
445 tomoyo_addprintf(buffer, sizeof(buffer),
446 "0x%lX", min);
447 break;
448 case TOMOYO_VALUE_TYPE_OCTAL:
449 tomoyo_addprintf(buffer, sizeof(buffer),
450 "0%lo", min);
451 break;
452 default:
453 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
454 min);
455 break;
456 }
457 if (min == max && min_type == max_type)
458 break;
459 tomoyo_addprintf(buffer, sizeof(buffer), "-");
460 min_type = max_type;
461 min = max;
462 }
463 tomoyo_io_printf(head, "%s", buffer);
464 }
465 }
466
467 /**
468 * tomoyo_print_number_union - Print a tomoyo_number_union.
469 *
470 * @head: Pointer to "struct tomoyo_io_buffer".
471 * @ptr: Pointer to "struct tomoyo_number_union".
472 *
473 * Returns nothing.
474 */
tomoyo_print_number_union(struct tomoyo_io_buffer * head,const struct tomoyo_number_union * ptr)475 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
476 const struct tomoyo_number_union *ptr)
477 {
478 tomoyo_set_space(head);
479 tomoyo_print_number_union_nospace(head, ptr);
480 }
481
482 /**
483 * tomoyo_assign_profile - Create a new profile.
484 *
485 * @ns: Pointer to "struct tomoyo_policy_namespace".
486 * @profile: Profile number to create.
487 *
488 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
489 */
tomoyo_assign_profile(struct tomoyo_policy_namespace * ns,const unsigned int profile)490 static struct tomoyo_profile *tomoyo_assign_profile
491 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
492 {
493 struct tomoyo_profile *ptr;
494 struct tomoyo_profile *entry;
495
496 if (profile >= TOMOYO_MAX_PROFILES)
497 return NULL;
498 ptr = ns->profile_ptr[profile];
499 if (ptr)
500 return ptr;
501 entry = kzalloc(sizeof(*entry), GFP_NOFS);
502 if (mutex_lock_interruptible(&tomoyo_policy_lock))
503 goto out;
504 ptr = ns->profile_ptr[profile];
505 if (!ptr && tomoyo_memory_ok(entry)) {
506 ptr = entry;
507 ptr->default_config = TOMOYO_CONFIG_DISABLED |
508 TOMOYO_CONFIG_WANT_GRANT_LOG |
509 TOMOYO_CONFIG_WANT_REJECT_LOG;
510 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
511 sizeof(ptr->config));
512 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
513 CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
514 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
515 CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
516 mb(); /* Avoid out-of-order execution. */
517 ns->profile_ptr[profile] = ptr;
518 entry = NULL;
519 }
520 mutex_unlock(&tomoyo_policy_lock);
521 out:
522 kfree(entry);
523 return ptr;
524 }
525
526 /**
527 * tomoyo_profile - Find a profile.
528 *
529 * @ns: Pointer to "struct tomoyo_policy_namespace".
530 * @profile: Profile number to find.
531 *
532 * Returns pointer to "struct tomoyo_profile".
533 */
tomoyo_profile(const struct tomoyo_policy_namespace * ns,const u8 profile)534 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
535 const u8 profile)
536 {
537 static struct tomoyo_profile tomoyo_null_profile;
538 struct tomoyo_profile *ptr = ns->profile_ptr[profile];
539
540 if (!ptr)
541 ptr = &tomoyo_null_profile;
542 return ptr;
543 }
544
545 /**
546 * tomoyo_find_yesno - Find values for specified keyword.
547 *
548 * @string: String to check.
549 * @find: Name of keyword.
550 *
551 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
552 */
tomoyo_find_yesno(const char * string,const char * find)553 static s8 tomoyo_find_yesno(const char *string, const char *find)
554 {
555 const char *cp = strstr(string, find);
556
557 if (cp) {
558 cp += strlen(find);
559 if (!strncmp(cp, "=yes", 4))
560 return 1;
561 else if (!strncmp(cp, "=no", 3))
562 return 0;
563 }
564 return -1;
565 }
566
567 /**
568 * tomoyo_set_uint - Set value for specified preference.
569 *
570 * @i: Pointer to "unsigned int".
571 * @string: String to check.
572 * @find: Name of keyword.
573 *
574 * Returns nothing.
575 */
tomoyo_set_uint(unsigned int * i,const char * string,const char * find)576 static void tomoyo_set_uint(unsigned int *i, const char *string,
577 const char *find)
578 {
579 const char *cp = strstr(string, find);
580
581 if (cp)
582 sscanf(cp + strlen(find), "=%u", i);
583 }
584
585 /**
586 * tomoyo_set_mode - Set mode for specified profile.
587 *
588 * @name: Name of functionality.
589 * @value: Mode for @name.
590 * @profile: Pointer to "struct tomoyo_profile".
591 *
592 * Returns 0 on success, negative value otherwise.
593 */
tomoyo_set_mode(char * name,const char * value,struct tomoyo_profile * profile)594 static int tomoyo_set_mode(char *name, const char *value,
595 struct tomoyo_profile *profile)
596 {
597 u8 i;
598 u8 config;
599
600 if (!strcmp(name, "CONFIG")) {
601 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
602 config = profile->default_config;
603 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
604 config = 0;
605 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
606 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
607 int len = 0;
608
609 if (i < TOMOYO_MAX_MAC_INDEX) {
610 const u8 c = tomoyo_index2category[i];
611 const char *category =
612 tomoyo_category_keywords[c];
613
614 len = strlen(category);
615 if (strncmp(name, category, len) ||
616 name[len++] != ':' || name[len++] != ':')
617 continue;
618 }
619 if (strcmp(name + len, tomoyo_mac_keywords[i]))
620 continue;
621 config = profile->config[i];
622 break;
623 }
624 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
625 return -EINVAL;
626 } else {
627 return -EINVAL;
628 }
629 if (strstr(value, "use_default")) {
630 config = TOMOYO_CONFIG_USE_DEFAULT;
631 } else {
632 u8 mode;
633
634 for (mode = 0; mode < 4; mode++)
635 if (strstr(value, tomoyo_mode[mode]))
636 /*
637 * Update lower 3 bits in order to distinguish
638 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
639 */
640 config = (config & ~7) | mode;
641 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
642 switch (tomoyo_find_yesno(value, "grant_log")) {
643 case 1:
644 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
645 break;
646 case 0:
647 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
648 break;
649 }
650 switch (tomoyo_find_yesno(value, "reject_log")) {
651 case 1:
652 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
653 break;
654 case 0:
655 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
656 break;
657 }
658 }
659 }
660 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
661 profile->config[i] = config;
662 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
663 profile->default_config = config;
664 return 0;
665 }
666
667 /**
668 * tomoyo_write_profile - Write profile table.
669 *
670 * @head: Pointer to "struct tomoyo_io_buffer".
671 *
672 * Returns 0 on success, negative value otherwise.
673 */
tomoyo_write_profile(struct tomoyo_io_buffer * head)674 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
675 {
676 char *data = head->write_buf;
677 unsigned int i;
678 char *cp;
679 struct tomoyo_profile *profile;
680
681 if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
682 == 1)
683 return 0;
684 i = simple_strtoul(data, &cp, 10);
685 if (*cp != '-')
686 return -EINVAL;
687 data = cp + 1;
688 profile = tomoyo_assign_profile(head->w.ns, i);
689 if (!profile)
690 return -EINVAL;
691 cp = strchr(data, '=');
692 if (!cp)
693 return -EINVAL;
694 *cp++ = '\0';
695 if (!strcmp(data, "COMMENT")) {
696 static DEFINE_SPINLOCK(lock);
697 const struct tomoyo_path_info *new_comment
698 = tomoyo_get_name(cp);
699 const struct tomoyo_path_info *old_comment;
700
701 if (!new_comment)
702 return -ENOMEM;
703 spin_lock(&lock);
704 old_comment = profile->comment;
705 profile->comment = new_comment;
706 spin_unlock(&lock);
707 tomoyo_put_name(old_comment);
708 return 0;
709 }
710 if (!strcmp(data, "PREFERENCE")) {
711 for (i = 0; i < TOMOYO_MAX_PREF; i++)
712 tomoyo_set_uint(&profile->pref[i], cp,
713 tomoyo_pref_keywords[i]);
714 return 0;
715 }
716 return tomoyo_set_mode(data, cp, profile);
717 }
718
719 /**
720 * tomoyo_print_config - Print mode for specified functionality.
721 *
722 * @head: Pointer to "struct tomoyo_io_buffer".
723 * @config: Mode for that functionality.
724 *
725 * Returns nothing.
726 *
727 * Caller prints functionality's name.
728 */
tomoyo_print_config(struct tomoyo_io_buffer * head,const u8 config)729 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
730 {
731 tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
732 tomoyo_mode[config & 3],
733 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
734 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
735 }
736
737 /**
738 * tomoyo_read_profile - Read profile table.
739 *
740 * @head: Pointer to "struct tomoyo_io_buffer".
741 *
742 * Returns nothing.
743 */
tomoyo_read_profile(struct tomoyo_io_buffer * head)744 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
745 {
746 u8 index;
747 struct tomoyo_policy_namespace *ns =
748 container_of(head->r.ns, typeof(*ns), namespace_list);
749 const struct tomoyo_profile *profile;
750
751 if (head->r.eof)
752 return;
753 next:
754 index = head->r.index;
755 profile = ns->profile_ptr[index];
756 switch (head->r.step) {
757 case 0:
758 tomoyo_print_namespace(head);
759 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
760 ns->profile_version);
761 head->r.step++;
762 break;
763 case 1:
764 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
765 head->r.index++)
766 if (ns->profile_ptr[head->r.index])
767 break;
768 if (head->r.index == TOMOYO_MAX_PROFILES) {
769 head->r.eof = true;
770 return;
771 }
772 head->r.step++;
773 break;
774 case 2:
775 {
776 u8 i;
777 const struct tomoyo_path_info *comment =
778 profile->comment;
779
780 tomoyo_print_namespace(head);
781 tomoyo_io_printf(head, "%u-COMMENT=", index);
782 tomoyo_set_string(head, comment ? comment->name : "");
783 tomoyo_set_lf(head);
784 tomoyo_print_namespace(head);
785 tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
786 for (i = 0; i < TOMOYO_MAX_PREF; i++)
787 tomoyo_io_printf(head, "%s=%u ",
788 tomoyo_pref_keywords[i],
789 profile->pref[i]);
790 tomoyo_set_string(head, "}\n");
791 head->r.step++;
792 }
793 break;
794 case 3:
795 {
796 tomoyo_print_namespace(head);
797 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
798 tomoyo_print_config(head, profile->default_config);
799 head->r.bit = 0;
800 head->r.step++;
801 }
802 break;
803 case 4:
804 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
805 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
806 const u8 i = head->r.bit;
807 const u8 config = profile->config[i];
808
809 if (config == TOMOYO_CONFIG_USE_DEFAULT)
810 continue;
811 tomoyo_print_namespace(head);
812 if (i < TOMOYO_MAX_MAC_INDEX)
813 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
814 index,
815 tomoyo_category_keywords
816 [tomoyo_index2category[i]],
817 tomoyo_mac_keywords[i]);
818 else
819 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
820 tomoyo_mac_keywords[i]);
821 tomoyo_print_config(head, config);
822 head->r.bit++;
823 break;
824 }
825 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
826 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
827 head->r.index++;
828 head->r.step = 1;
829 }
830 break;
831 }
832 if (tomoyo_flush(head))
833 goto next;
834 }
835
836 /**
837 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
838 *
839 * @a: Pointer to "struct tomoyo_acl_head".
840 * @b: Pointer to "struct tomoyo_acl_head".
841 *
842 * Returns true if @a == @b, false otherwise.
843 */
tomoyo_same_manager(const struct tomoyo_acl_head * a,const struct tomoyo_acl_head * b)844 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
845 const struct tomoyo_acl_head *b)
846 {
847 return container_of(a, struct tomoyo_manager, head)->manager ==
848 container_of(b, struct tomoyo_manager, head)->manager;
849 }
850
851 /**
852 * tomoyo_update_manager_entry - Add a manager entry.
853 *
854 * @manager: The path to manager or the domainnamme.
855 * @is_delete: True if it is a delete request.
856 *
857 * Returns 0 on success, negative value otherwise.
858 *
859 * Caller holds tomoyo_read_lock().
860 */
tomoyo_update_manager_entry(const char * manager,const bool is_delete)861 static int tomoyo_update_manager_entry(const char *manager,
862 const bool is_delete)
863 {
864 struct tomoyo_manager e = { };
865 struct tomoyo_acl_param param = {
866 /* .ns = &tomoyo_kernel_namespace, */
867 .is_delete = is_delete,
868 .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
869 };
870 int error = is_delete ? -ENOENT : -ENOMEM;
871
872 if (!tomoyo_correct_domain(manager) &&
873 !tomoyo_correct_word(manager))
874 return -EINVAL;
875 e.manager = tomoyo_get_name(manager);
876 if (e.manager) {
877 error = tomoyo_update_policy(&e.head, sizeof(e), ¶m,
878 tomoyo_same_manager);
879 tomoyo_put_name(e.manager);
880 }
881 return error;
882 }
883
884 /**
885 * tomoyo_write_manager - Write manager policy.
886 *
887 * @head: Pointer to "struct tomoyo_io_buffer".
888 *
889 * Returns 0 on success, negative value otherwise.
890 *
891 * Caller holds tomoyo_read_lock().
892 */
tomoyo_write_manager(struct tomoyo_io_buffer * head)893 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
894 {
895 char *data = head->write_buf;
896
897 if (!strcmp(data, "manage_by_non_root")) {
898 tomoyo_manage_by_non_root = !head->w.is_delete;
899 return 0;
900 }
901 return tomoyo_update_manager_entry(data, head->w.is_delete);
902 }
903
904 /**
905 * tomoyo_read_manager - Read manager policy.
906 *
907 * @head: Pointer to "struct tomoyo_io_buffer".
908 *
909 * Caller holds tomoyo_read_lock().
910 */
tomoyo_read_manager(struct tomoyo_io_buffer * head)911 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
912 {
913 if (head->r.eof)
914 return;
915 list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
916 struct tomoyo_manager *ptr =
917 list_entry(head->r.acl, typeof(*ptr), head.list);
918
919 if (ptr->head.is_deleted)
920 continue;
921 if (!tomoyo_flush(head))
922 return;
923 tomoyo_set_string(head, ptr->manager->name);
924 tomoyo_set_lf(head);
925 }
926 head->r.eof = true;
927 }
928
929 /**
930 * tomoyo_manager - Check whether the current process is a policy manager.
931 *
932 * Returns true if the current process is permitted to modify policy
933 * via /sys/kernel/security/tomoyo/ interface.
934 *
935 * Caller holds tomoyo_read_lock().
936 */
tomoyo_manager(void)937 static bool tomoyo_manager(void)
938 {
939 struct tomoyo_manager *ptr;
940 const char *exe;
941 const struct task_struct *task = current;
942 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
943 bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
944
945 if (!tomoyo_policy_loaded)
946 return true;
947 if (!tomoyo_manage_by_non_root &&
948 (!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) ||
949 !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
950 return false;
951 exe = tomoyo_get_exe();
952 if (!exe)
953 return false;
954 list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
955 srcu_read_lock_held(&tomoyo_ss)) {
956 if (!ptr->head.is_deleted &&
957 (!tomoyo_pathcmp(domainname, ptr->manager) ||
958 !strcmp(exe, ptr->manager->name))) {
959 found = true;
960 break;
961 }
962 }
963 if (!found) { /* Reduce error messages. */
964 static pid_t last_pid;
965 const pid_t pid = current->pid;
966
967 if (last_pid != pid) {
968 pr_warn("%s ( %s ) is not permitted to update policies.\n",
969 domainname->name, exe);
970 last_pid = pid;
971 }
972 }
973 kfree(exe);
974 return found;
975 }
976
977 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
978 (unsigned int serial);
979
980 /**
981 * tomoyo_select_domain - Parse select command.
982 *
983 * @head: Pointer to "struct tomoyo_io_buffer".
984 * @data: String to parse.
985 *
986 * Returns true on success, false otherwise.
987 *
988 * Caller holds tomoyo_read_lock().
989 */
tomoyo_select_domain(struct tomoyo_io_buffer * head,const char * data)990 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
991 const char *data)
992 {
993 unsigned int pid;
994 struct tomoyo_domain_info *domain = NULL;
995 bool global_pid = false;
996
997 if (strncmp(data, "select ", 7))
998 return false;
999 data += 7;
1000 if (sscanf(data, "pid=%u", &pid) == 1 ||
1001 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
1002 struct task_struct *p;
1003
1004 rcu_read_lock();
1005 if (global_pid)
1006 p = find_task_by_pid_ns(pid, &init_pid_ns);
1007 else
1008 p = find_task_by_vpid(pid);
1009 if (p)
1010 domain = tomoyo_task(p)->domain_info;
1011 rcu_read_unlock();
1012 } else if (!strncmp(data, "domain=", 7)) {
1013 if (tomoyo_domain_def(data + 7))
1014 domain = tomoyo_find_domain(data + 7);
1015 } else if (sscanf(data, "Q=%u", &pid) == 1) {
1016 domain = tomoyo_find_domain_by_qid(pid);
1017 } else
1018 return false;
1019 head->w.domain = domain;
1020 /* Accessing read_buf is safe because head->io_sem is held. */
1021 if (!head->read_buf)
1022 return true; /* Do nothing if open(O_WRONLY). */
1023 memset(&head->r, 0, sizeof(head->r));
1024 head->r.print_this_domain_only = true;
1025 if (domain)
1026 head->r.domain = &domain->list;
1027 else
1028 head->r.eof = 1;
1029 tomoyo_io_printf(head, "# select %s\n", data);
1030 if (domain && domain->is_deleted)
1031 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1032 return true;
1033 }
1034
1035 /**
1036 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1037 *
1038 * @a: Pointer to "struct tomoyo_acl_info".
1039 * @b: Pointer to "struct tomoyo_acl_info".
1040 *
1041 * Returns true if @a == @b, false otherwise.
1042 */
tomoyo_same_task_acl(const struct tomoyo_acl_info * a,const struct tomoyo_acl_info * b)1043 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1044 const struct tomoyo_acl_info *b)
1045 {
1046 const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1047 const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1048
1049 return p1->domainname == p2->domainname;
1050 }
1051
1052 /**
1053 * tomoyo_write_task - Update task related list.
1054 *
1055 * @param: Pointer to "struct tomoyo_acl_param".
1056 *
1057 * Returns 0 on success, negative value otherwise.
1058 *
1059 * Caller holds tomoyo_read_lock().
1060 */
tomoyo_write_task(struct tomoyo_acl_param * param)1061 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1062 {
1063 int error = -EINVAL;
1064
1065 if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
1066 struct tomoyo_task_acl e = {
1067 .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1068 .domainname = tomoyo_get_domainname(param),
1069 };
1070
1071 if (e.domainname)
1072 error = tomoyo_update_domain(&e.head, sizeof(e), param,
1073 tomoyo_same_task_acl,
1074 NULL);
1075 tomoyo_put_name(e.domainname);
1076 }
1077 return error;
1078 }
1079
1080 /**
1081 * tomoyo_delete_domain - Delete a domain.
1082 *
1083 * @domainname: The name of domain.
1084 *
1085 * Returns 0 on success, negative value otherwise.
1086 *
1087 * Caller holds tomoyo_read_lock().
1088 */
tomoyo_delete_domain(char * domainname)1089 static int tomoyo_delete_domain(char *domainname)
1090 {
1091 struct tomoyo_domain_info *domain;
1092 struct tomoyo_path_info name;
1093
1094 name.name = domainname;
1095 tomoyo_fill_path_info(&name);
1096 if (mutex_lock_interruptible(&tomoyo_policy_lock))
1097 return -EINTR;
1098 /* Is there an active domain? */
1099 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1100 srcu_read_lock_held(&tomoyo_ss)) {
1101 /* Never delete tomoyo_kernel_domain */
1102 if (domain == &tomoyo_kernel_domain)
1103 continue;
1104 if (domain->is_deleted ||
1105 tomoyo_pathcmp(domain->domainname, &name))
1106 continue;
1107 domain->is_deleted = true;
1108 break;
1109 }
1110 mutex_unlock(&tomoyo_policy_lock);
1111 return 0;
1112 }
1113
1114 /**
1115 * tomoyo_write_domain2 - Write domain policy.
1116 *
1117 * @ns: Pointer to "struct tomoyo_policy_namespace".
1118 * @list: Pointer to "struct list_head".
1119 * @data: Policy to be interpreted.
1120 * @is_delete: True if it is a delete request.
1121 *
1122 * Returns 0 on success, negative value otherwise.
1123 *
1124 * Caller holds tomoyo_read_lock().
1125 */
tomoyo_write_domain2(struct tomoyo_policy_namespace * ns,struct list_head * list,char * data,const bool is_delete)1126 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1127 struct list_head *list, char *data,
1128 const bool is_delete)
1129 {
1130 struct tomoyo_acl_param param = {
1131 .ns = ns,
1132 .list = list,
1133 .data = data,
1134 .is_delete = is_delete,
1135 };
1136 static const struct {
1137 const char *keyword;
1138 int (*write)(struct tomoyo_acl_param *param);
1139 } tomoyo_callback[5] = {
1140 { "file ", tomoyo_write_file },
1141 { "network inet ", tomoyo_write_inet_network },
1142 { "network unix ", tomoyo_write_unix_network },
1143 { "misc ", tomoyo_write_misc },
1144 { "task ", tomoyo_write_task },
1145 };
1146 u8 i;
1147
1148 for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1149 if (!tomoyo_str_starts(¶m.data,
1150 tomoyo_callback[i].keyword))
1151 continue;
1152 return tomoyo_callback[i].write(¶m);
1153 }
1154 return -EINVAL;
1155 }
1156
1157 /* String table for domain flags. */
1158 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1159 [TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1160 [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1161 };
1162
1163 /**
1164 * tomoyo_write_domain - Write domain policy.
1165 *
1166 * @head: Pointer to "struct tomoyo_io_buffer".
1167 *
1168 * Returns 0 on success, negative value otherwise.
1169 *
1170 * Caller holds tomoyo_read_lock().
1171 */
tomoyo_write_domain(struct tomoyo_io_buffer * head)1172 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1173 {
1174 char *data = head->write_buf;
1175 struct tomoyo_policy_namespace *ns;
1176 struct tomoyo_domain_info *domain = head->w.domain;
1177 const bool is_delete = head->w.is_delete;
1178 bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1179 unsigned int idx;
1180
1181 if (*data == '<') {
1182 int ret = 0;
1183
1184 domain = NULL;
1185 if (is_delete)
1186 ret = tomoyo_delete_domain(data);
1187 else if (is_select)
1188 domain = tomoyo_find_domain(data);
1189 else
1190 domain = tomoyo_assign_domain(data, false);
1191 head->w.domain = domain;
1192 return ret;
1193 }
1194 if (!domain)
1195 return -EINVAL;
1196 ns = domain->ns;
1197 if (sscanf(data, "use_profile %u", &idx) == 1
1198 && idx < TOMOYO_MAX_PROFILES) {
1199 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1200 if (!is_delete)
1201 domain->profile = (u8) idx;
1202 return 0;
1203 }
1204 if (sscanf(data, "use_group %u\n", &idx) == 1
1205 && idx < TOMOYO_MAX_ACL_GROUPS) {
1206 if (!is_delete)
1207 set_bit(idx, domain->group);
1208 else
1209 clear_bit(idx, domain->group);
1210 return 0;
1211 }
1212 for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1213 const char *cp = tomoyo_dif[idx];
1214
1215 if (strncmp(data, cp, strlen(cp) - 1))
1216 continue;
1217 domain->flags[idx] = !is_delete;
1218 return 0;
1219 }
1220 return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1221 is_delete);
1222 }
1223
1224 /**
1225 * tomoyo_print_condition - Print condition part.
1226 *
1227 * @head: Pointer to "struct tomoyo_io_buffer".
1228 * @cond: Pointer to "struct tomoyo_condition".
1229 *
1230 * Returns true on success, false otherwise.
1231 */
tomoyo_print_condition(struct tomoyo_io_buffer * head,const struct tomoyo_condition * cond)1232 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1233 const struct tomoyo_condition *cond)
1234 {
1235 switch (head->r.cond_step) {
1236 case 0:
1237 head->r.cond_index = 0;
1238 head->r.cond_step++;
1239 if (cond->transit) {
1240 tomoyo_set_space(head);
1241 tomoyo_set_string(head, cond->transit->name);
1242 }
1243 /* fall through */
1244 case 1:
1245 {
1246 const u16 condc = cond->condc;
1247 const struct tomoyo_condition_element *condp =
1248 (typeof(condp)) (cond + 1);
1249 const struct tomoyo_number_union *numbers_p =
1250 (typeof(numbers_p)) (condp + condc);
1251 const struct tomoyo_name_union *names_p =
1252 (typeof(names_p))
1253 (numbers_p + cond->numbers_count);
1254 const struct tomoyo_argv *argv =
1255 (typeof(argv)) (names_p + cond->names_count);
1256 const struct tomoyo_envp *envp =
1257 (typeof(envp)) (argv + cond->argc);
1258 u16 skip;
1259
1260 for (skip = 0; skip < head->r.cond_index; skip++) {
1261 const u8 left = condp->left;
1262 const u8 right = condp->right;
1263
1264 condp++;
1265 switch (left) {
1266 case TOMOYO_ARGV_ENTRY:
1267 argv++;
1268 continue;
1269 case TOMOYO_ENVP_ENTRY:
1270 envp++;
1271 continue;
1272 case TOMOYO_NUMBER_UNION:
1273 numbers_p++;
1274 break;
1275 }
1276 switch (right) {
1277 case TOMOYO_NAME_UNION:
1278 names_p++;
1279 break;
1280 case TOMOYO_NUMBER_UNION:
1281 numbers_p++;
1282 break;
1283 }
1284 }
1285 while (head->r.cond_index < condc) {
1286 const u8 match = condp->equals;
1287 const u8 left = condp->left;
1288 const u8 right = condp->right;
1289
1290 if (!tomoyo_flush(head))
1291 return false;
1292 condp++;
1293 head->r.cond_index++;
1294 tomoyo_set_space(head);
1295 switch (left) {
1296 case TOMOYO_ARGV_ENTRY:
1297 tomoyo_io_printf(head,
1298 "exec.argv[%lu]%s=\"",
1299 argv->index, argv->is_not ? "!" : "");
1300 tomoyo_set_string(head,
1301 argv->value->name);
1302 tomoyo_set_string(head, "\"");
1303 argv++;
1304 continue;
1305 case TOMOYO_ENVP_ENTRY:
1306 tomoyo_set_string(head,
1307 "exec.envp[\"");
1308 tomoyo_set_string(head,
1309 envp->name->name);
1310 tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1311 if (envp->value) {
1312 tomoyo_set_string(head, "\"");
1313 tomoyo_set_string(head, envp->value->name);
1314 tomoyo_set_string(head, "\"");
1315 } else {
1316 tomoyo_set_string(head,
1317 "NULL");
1318 }
1319 envp++;
1320 continue;
1321 case TOMOYO_NUMBER_UNION:
1322 tomoyo_print_number_union_nospace
1323 (head, numbers_p++);
1324 break;
1325 default:
1326 tomoyo_set_string(head,
1327 tomoyo_condition_keyword[left]);
1328 break;
1329 }
1330 tomoyo_set_string(head, match ? "=" : "!=");
1331 switch (right) {
1332 case TOMOYO_NAME_UNION:
1333 tomoyo_print_name_union_quoted
1334 (head, names_p++);
1335 break;
1336 case TOMOYO_NUMBER_UNION:
1337 tomoyo_print_number_union_nospace
1338 (head, numbers_p++);
1339 break;
1340 default:
1341 tomoyo_set_string(head,
1342 tomoyo_condition_keyword[right]);
1343 break;
1344 }
1345 }
1346 }
1347 head->r.cond_step++;
1348 /* fall through */
1349 case 2:
1350 if (!tomoyo_flush(head))
1351 break;
1352 head->r.cond_step++;
1353 /* fall through */
1354 case 3:
1355 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1356 tomoyo_io_printf(head, " grant_log=%s",
1357 tomoyo_yesno(cond->grant_log ==
1358 TOMOYO_GRANTLOG_YES));
1359 tomoyo_set_lf(head);
1360 return true;
1361 }
1362 return false;
1363 }
1364
1365 /**
1366 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1367 *
1368 * @head: Pointer to "struct tomoyo_io_buffer".
1369 * @category: Category name.
1370 *
1371 * Returns nothing.
1372 */
tomoyo_set_group(struct tomoyo_io_buffer * head,const char * category)1373 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1374 const char *category)
1375 {
1376 if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1377 tomoyo_print_namespace(head);
1378 tomoyo_io_printf(head, "acl_group %u ",
1379 head->r.acl_group_index);
1380 }
1381 tomoyo_set_string(head, category);
1382 }
1383
1384 /**
1385 * tomoyo_print_entry - Print an ACL entry.
1386 *
1387 * @head: Pointer to "struct tomoyo_io_buffer".
1388 * @acl: Pointer to an ACL entry.
1389 *
1390 * Returns true on success, false otherwise.
1391 */
tomoyo_print_entry(struct tomoyo_io_buffer * head,struct tomoyo_acl_info * acl)1392 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1393 struct tomoyo_acl_info *acl)
1394 {
1395 const u8 acl_type = acl->type;
1396 bool first = true;
1397 u8 bit;
1398
1399 if (head->r.print_cond_part)
1400 goto print_cond_part;
1401 if (acl->is_deleted)
1402 return true;
1403 if (!tomoyo_flush(head))
1404 return false;
1405 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1406 struct tomoyo_path_acl *ptr =
1407 container_of(acl, typeof(*ptr), head);
1408 const u16 perm = ptr->perm;
1409
1410 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1411 if (!(perm & (1 << bit)))
1412 continue;
1413 if (head->r.print_transition_related_only &&
1414 bit != TOMOYO_TYPE_EXECUTE)
1415 continue;
1416 if (first) {
1417 tomoyo_set_group(head, "file ");
1418 first = false;
1419 } else {
1420 tomoyo_set_slash(head);
1421 }
1422 tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1423 }
1424 if (first)
1425 return true;
1426 tomoyo_print_name_union(head, &ptr->name);
1427 } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1428 struct tomoyo_task_acl *ptr =
1429 container_of(acl, typeof(*ptr), head);
1430
1431 tomoyo_set_group(head, "task ");
1432 tomoyo_set_string(head, "manual_domain_transition ");
1433 tomoyo_set_string(head, ptr->domainname->name);
1434 } else if (head->r.print_transition_related_only) {
1435 return true;
1436 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1437 struct tomoyo_path2_acl *ptr =
1438 container_of(acl, typeof(*ptr), head);
1439 const u8 perm = ptr->perm;
1440
1441 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1442 if (!(perm & (1 << bit)))
1443 continue;
1444 if (first) {
1445 tomoyo_set_group(head, "file ");
1446 first = false;
1447 } else {
1448 tomoyo_set_slash(head);
1449 }
1450 tomoyo_set_string(head, tomoyo_mac_keywords
1451 [tomoyo_pp2mac[bit]]);
1452 }
1453 if (first)
1454 return true;
1455 tomoyo_print_name_union(head, &ptr->name1);
1456 tomoyo_print_name_union(head, &ptr->name2);
1457 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1458 struct tomoyo_path_number_acl *ptr =
1459 container_of(acl, typeof(*ptr), head);
1460 const u8 perm = ptr->perm;
1461
1462 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1463 if (!(perm & (1 << bit)))
1464 continue;
1465 if (first) {
1466 tomoyo_set_group(head, "file ");
1467 first = false;
1468 } else {
1469 tomoyo_set_slash(head);
1470 }
1471 tomoyo_set_string(head, tomoyo_mac_keywords
1472 [tomoyo_pn2mac[bit]]);
1473 }
1474 if (first)
1475 return true;
1476 tomoyo_print_name_union(head, &ptr->name);
1477 tomoyo_print_number_union(head, &ptr->number);
1478 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1479 struct tomoyo_mkdev_acl *ptr =
1480 container_of(acl, typeof(*ptr), head);
1481 const u8 perm = ptr->perm;
1482
1483 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1484 if (!(perm & (1 << bit)))
1485 continue;
1486 if (first) {
1487 tomoyo_set_group(head, "file ");
1488 first = false;
1489 } else {
1490 tomoyo_set_slash(head);
1491 }
1492 tomoyo_set_string(head, tomoyo_mac_keywords
1493 [tomoyo_pnnn2mac[bit]]);
1494 }
1495 if (first)
1496 return true;
1497 tomoyo_print_name_union(head, &ptr->name);
1498 tomoyo_print_number_union(head, &ptr->mode);
1499 tomoyo_print_number_union(head, &ptr->major);
1500 tomoyo_print_number_union(head, &ptr->minor);
1501 } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1502 struct tomoyo_inet_acl *ptr =
1503 container_of(acl, typeof(*ptr), head);
1504 const u8 perm = ptr->perm;
1505
1506 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1507 if (!(perm & (1 << bit)))
1508 continue;
1509 if (first) {
1510 tomoyo_set_group(head, "network inet ");
1511 tomoyo_set_string(head, tomoyo_proto_keyword
1512 [ptr->protocol]);
1513 tomoyo_set_space(head);
1514 first = false;
1515 } else {
1516 tomoyo_set_slash(head);
1517 }
1518 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1519 }
1520 if (first)
1521 return true;
1522 tomoyo_set_space(head);
1523 if (ptr->address.group) {
1524 tomoyo_set_string(head, "@");
1525 tomoyo_set_string(head, ptr->address.group->group_name
1526 ->name);
1527 } else {
1528 char buf[128];
1529
1530 tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1531 tomoyo_io_printf(head, "%s", buf);
1532 }
1533 tomoyo_print_number_union(head, &ptr->port);
1534 } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1535 struct tomoyo_unix_acl *ptr =
1536 container_of(acl, typeof(*ptr), head);
1537 const u8 perm = ptr->perm;
1538
1539 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1540 if (!(perm & (1 << bit)))
1541 continue;
1542 if (first) {
1543 tomoyo_set_group(head, "network unix ");
1544 tomoyo_set_string(head, tomoyo_proto_keyword
1545 [ptr->protocol]);
1546 tomoyo_set_space(head);
1547 first = false;
1548 } else {
1549 tomoyo_set_slash(head);
1550 }
1551 tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1552 }
1553 if (first)
1554 return true;
1555 tomoyo_print_name_union(head, &ptr->name);
1556 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1557 struct tomoyo_mount_acl *ptr =
1558 container_of(acl, typeof(*ptr), head);
1559
1560 tomoyo_set_group(head, "file mount");
1561 tomoyo_print_name_union(head, &ptr->dev_name);
1562 tomoyo_print_name_union(head, &ptr->dir_name);
1563 tomoyo_print_name_union(head, &ptr->fs_type);
1564 tomoyo_print_number_union(head, &ptr->flags);
1565 } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1566 struct tomoyo_env_acl *ptr =
1567 container_of(acl, typeof(*ptr), head);
1568
1569 tomoyo_set_group(head, "misc env ");
1570 tomoyo_set_string(head, ptr->env->name);
1571 }
1572 if (acl->cond) {
1573 head->r.print_cond_part = true;
1574 head->r.cond_step = 0;
1575 if (!tomoyo_flush(head))
1576 return false;
1577 print_cond_part:
1578 if (!tomoyo_print_condition(head, acl->cond))
1579 return false;
1580 head->r.print_cond_part = false;
1581 } else {
1582 tomoyo_set_lf(head);
1583 }
1584 return true;
1585 }
1586
1587 /**
1588 * tomoyo_read_domain2 - Read domain policy.
1589 *
1590 * @head: Pointer to "struct tomoyo_io_buffer".
1591 * @list: Pointer to "struct list_head".
1592 *
1593 * Caller holds tomoyo_read_lock().
1594 *
1595 * Returns true on success, false otherwise.
1596 */
tomoyo_read_domain2(struct tomoyo_io_buffer * head,struct list_head * list)1597 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1598 struct list_head *list)
1599 {
1600 list_for_each_cookie(head->r.acl, list) {
1601 struct tomoyo_acl_info *ptr =
1602 list_entry(head->r.acl, typeof(*ptr), list);
1603
1604 if (!tomoyo_print_entry(head, ptr))
1605 return false;
1606 }
1607 head->r.acl = NULL;
1608 return true;
1609 }
1610
1611 /**
1612 * tomoyo_read_domain - Read domain policy.
1613 *
1614 * @head: Pointer to "struct tomoyo_io_buffer".
1615 *
1616 * Caller holds tomoyo_read_lock().
1617 */
tomoyo_read_domain(struct tomoyo_io_buffer * head)1618 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1619 {
1620 if (head->r.eof)
1621 return;
1622 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1623 struct tomoyo_domain_info *domain =
1624 list_entry(head->r.domain, typeof(*domain), list);
1625 u8 i;
1626
1627 switch (head->r.step) {
1628 case 0:
1629 if (domain->is_deleted &&
1630 !head->r.print_this_domain_only)
1631 continue;
1632 /* Print domainname and flags. */
1633 tomoyo_set_string(head, domain->domainname->name);
1634 tomoyo_set_lf(head);
1635 tomoyo_io_printf(head, "use_profile %u\n",
1636 domain->profile);
1637 for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1638 if (domain->flags[i])
1639 tomoyo_set_string(head, tomoyo_dif[i]);
1640 head->r.index = 0;
1641 head->r.step++;
1642 /* fall through */
1643 case 1:
1644 while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1645 i = head->r.index++;
1646 if (!test_bit(i, domain->group))
1647 continue;
1648 tomoyo_io_printf(head, "use_group %u\n", i);
1649 if (!tomoyo_flush(head))
1650 return;
1651 }
1652 head->r.index = 0;
1653 head->r.step++;
1654 tomoyo_set_lf(head);
1655 /* fall through */
1656 case 2:
1657 if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1658 return;
1659 head->r.step++;
1660 if (!tomoyo_set_lf(head))
1661 return;
1662 /* fall through */
1663 case 3:
1664 head->r.step = 0;
1665 if (head->r.print_this_domain_only)
1666 goto done;
1667 }
1668 }
1669 done:
1670 head->r.eof = true;
1671 }
1672
1673 /**
1674 * tomoyo_write_pid: Specify PID to obtain domainname.
1675 *
1676 * @head: Pointer to "struct tomoyo_io_buffer".
1677 *
1678 * Returns 0.
1679 */
tomoyo_write_pid(struct tomoyo_io_buffer * head)1680 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1681 {
1682 head->r.eof = false;
1683 return 0;
1684 }
1685
1686 /**
1687 * tomoyo_read_pid - Get domainname of the specified PID.
1688 *
1689 * @head: Pointer to "struct tomoyo_io_buffer".
1690 *
1691 * Returns the domainname which the specified PID is in on success,
1692 * empty string otherwise.
1693 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1694 * using read()/write() interface rather than sysctl() interface.
1695 */
tomoyo_read_pid(struct tomoyo_io_buffer * head)1696 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1697 {
1698 char *buf = head->write_buf;
1699 bool global_pid = false;
1700 unsigned int pid;
1701 struct task_struct *p;
1702 struct tomoyo_domain_info *domain = NULL;
1703
1704 /* Accessing write_buf is safe because head->io_sem is held. */
1705 if (!buf) {
1706 head->r.eof = true;
1707 return; /* Do nothing if open(O_RDONLY). */
1708 }
1709 if (head->r.w_pos || head->r.eof)
1710 return;
1711 head->r.eof = true;
1712 if (tomoyo_str_starts(&buf, "global-pid "))
1713 global_pid = true;
1714 if (kstrtouint(buf, 10, &pid))
1715 return;
1716 rcu_read_lock();
1717 if (global_pid)
1718 p = find_task_by_pid_ns(pid, &init_pid_ns);
1719 else
1720 p = find_task_by_vpid(pid);
1721 if (p)
1722 domain = tomoyo_task(p)->domain_info;
1723 rcu_read_unlock();
1724 if (!domain)
1725 return;
1726 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1727 tomoyo_set_string(head, domain->domainname->name);
1728 }
1729
1730 /* String table for domain transition control keywords. */
1731 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1732 [TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1733 [TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1734 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1735 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1736 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1737 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1738 };
1739
1740 /* String table for grouping keywords. */
1741 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1742 [TOMOYO_PATH_GROUP] = "path_group ",
1743 [TOMOYO_NUMBER_GROUP] = "number_group ",
1744 [TOMOYO_ADDRESS_GROUP] = "address_group ",
1745 };
1746
1747 /**
1748 * tomoyo_write_exception - Write exception policy.
1749 *
1750 * @head: Pointer to "struct tomoyo_io_buffer".
1751 *
1752 * Returns 0 on success, negative value otherwise.
1753 *
1754 * Caller holds tomoyo_read_lock().
1755 */
tomoyo_write_exception(struct tomoyo_io_buffer * head)1756 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1757 {
1758 const bool is_delete = head->w.is_delete;
1759 struct tomoyo_acl_param param = {
1760 .ns = head->w.ns,
1761 .is_delete = is_delete,
1762 .data = head->write_buf,
1763 };
1764 u8 i;
1765
1766 if (tomoyo_str_starts(¶m.data, "aggregator "))
1767 return tomoyo_write_aggregator(¶m);
1768 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1769 if (tomoyo_str_starts(¶m.data, tomoyo_transition_type[i]))
1770 return tomoyo_write_transition_control(¶m, i);
1771 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1772 if (tomoyo_str_starts(¶m.data, tomoyo_group_name[i]))
1773 return tomoyo_write_group(¶m, i);
1774 if (tomoyo_str_starts(¶m.data, "acl_group ")) {
1775 unsigned int group;
1776 char *data;
1777
1778 group = simple_strtoul(param.data, &data, 10);
1779 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1780 return tomoyo_write_domain2
1781 (head->w.ns, &head->w.ns->acl_group[group],
1782 data, is_delete);
1783 }
1784 return -EINVAL;
1785 }
1786
1787 /**
1788 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1789 *
1790 * @head: Pointer to "struct tomoyo_io_buffer".
1791 * @idx: Index number.
1792 *
1793 * Returns true on success, false otherwise.
1794 *
1795 * Caller holds tomoyo_read_lock().
1796 */
tomoyo_read_group(struct tomoyo_io_buffer * head,const int idx)1797 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1798 {
1799 struct tomoyo_policy_namespace *ns =
1800 container_of(head->r.ns, typeof(*ns), namespace_list);
1801 struct list_head *list = &ns->group_list[idx];
1802
1803 list_for_each_cookie(head->r.group, list) {
1804 struct tomoyo_group *group =
1805 list_entry(head->r.group, typeof(*group), head.list);
1806
1807 list_for_each_cookie(head->r.acl, &group->member_list) {
1808 struct tomoyo_acl_head *ptr =
1809 list_entry(head->r.acl, typeof(*ptr), list);
1810
1811 if (ptr->is_deleted)
1812 continue;
1813 if (!tomoyo_flush(head))
1814 return false;
1815 tomoyo_print_namespace(head);
1816 tomoyo_set_string(head, tomoyo_group_name[idx]);
1817 tomoyo_set_string(head, group->group_name->name);
1818 if (idx == TOMOYO_PATH_GROUP) {
1819 tomoyo_set_space(head);
1820 tomoyo_set_string(head, container_of
1821 (ptr, struct tomoyo_path_group,
1822 head)->member_name->name);
1823 } else if (idx == TOMOYO_NUMBER_GROUP) {
1824 tomoyo_print_number_union(head, &container_of
1825 (ptr,
1826 struct tomoyo_number_group,
1827 head)->number);
1828 } else if (idx == TOMOYO_ADDRESS_GROUP) {
1829 char buffer[128];
1830 struct tomoyo_address_group *member =
1831 container_of(ptr, typeof(*member),
1832 head);
1833
1834 tomoyo_print_ip(buffer, sizeof(buffer),
1835 &member->address);
1836 tomoyo_io_printf(head, " %s", buffer);
1837 }
1838 tomoyo_set_lf(head);
1839 }
1840 head->r.acl = NULL;
1841 }
1842 head->r.group = NULL;
1843 return true;
1844 }
1845
1846 /**
1847 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1848 *
1849 * @head: Pointer to "struct tomoyo_io_buffer".
1850 * @idx: Index number.
1851 *
1852 * Returns true on success, false otherwise.
1853 *
1854 * Caller holds tomoyo_read_lock().
1855 */
tomoyo_read_policy(struct tomoyo_io_buffer * head,const int idx)1856 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1857 {
1858 struct tomoyo_policy_namespace *ns =
1859 container_of(head->r.ns, typeof(*ns), namespace_list);
1860 struct list_head *list = &ns->policy_list[idx];
1861
1862 list_for_each_cookie(head->r.acl, list) {
1863 struct tomoyo_acl_head *acl =
1864 container_of(head->r.acl, typeof(*acl), list);
1865 if (acl->is_deleted)
1866 continue;
1867 if (!tomoyo_flush(head))
1868 return false;
1869 switch (idx) {
1870 case TOMOYO_ID_TRANSITION_CONTROL:
1871 {
1872 struct tomoyo_transition_control *ptr =
1873 container_of(acl, typeof(*ptr), head);
1874
1875 tomoyo_print_namespace(head);
1876 tomoyo_set_string(head, tomoyo_transition_type
1877 [ptr->type]);
1878 tomoyo_set_string(head, ptr->program ?
1879 ptr->program->name : "any");
1880 tomoyo_set_string(head, " from ");
1881 tomoyo_set_string(head, ptr->domainname ?
1882 ptr->domainname->name :
1883 "any");
1884 }
1885 break;
1886 case TOMOYO_ID_AGGREGATOR:
1887 {
1888 struct tomoyo_aggregator *ptr =
1889 container_of(acl, typeof(*ptr), head);
1890
1891 tomoyo_print_namespace(head);
1892 tomoyo_set_string(head, "aggregator ");
1893 tomoyo_set_string(head,
1894 ptr->original_name->name);
1895 tomoyo_set_space(head);
1896 tomoyo_set_string(head,
1897 ptr->aggregated_name->name);
1898 }
1899 break;
1900 default:
1901 continue;
1902 }
1903 tomoyo_set_lf(head);
1904 }
1905 head->r.acl = NULL;
1906 return true;
1907 }
1908
1909 /**
1910 * tomoyo_read_exception - Read exception policy.
1911 *
1912 * @head: Pointer to "struct tomoyo_io_buffer".
1913 *
1914 * Caller holds tomoyo_read_lock().
1915 */
tomoyo_read_exception(struct tomoyo_io_buffer * head)1916 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1917 {
1918 struct tomoyo_policy_namespace *ns =
1919 container_of(head->r.ns, typeof(*ns), namespace_list);
1920
1921 if (head->r.eof)
1922 return;
1923 while (head->r.step < TOMOYO_MAX_POLICY &&
1924 tomoyo_read_policy(head, head->r.step))
1925 head->r.step++;
1926 if (head->r.step < TOMOYO_MAX_POLICY)
1927 return;
1928 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1929 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1930 head->r.step++;
1931 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1932 return;
1933 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1934 + TOMOYO_MAX_ACL_GROUPS) {
1935 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1936 - TOMOYO_MAX_GROUP;
1937 if (!tomoyo_read_domain2(head, &ns->acl_group
1938 [head->r.acl_group_index]))
1939 return;
1940 head->r.step++;
1941 }
1942 head->r.eof = true;
1943 }
1944
1945 /* Wait queue for kernel -> userspace notification. */
1946 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1947 /* Wait queue for userspace -> kernel notification. */
1948 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1949
1950 /* Structure for query. */
1951 struct tomoyo_query {
1952 struct list_head list;
1953 struct tomoyo_domain_info *domain;
1954 char *query;
1955 size_t query_len;
1956 unsigned int serial;
1957 u8 timer;
1958 u8 answer;
1959 u8 retry;
1960 };
1961
1962 /* The list for "struct tomoyo_query". */
1963 static LIST_HEAD(tomoyo_query_list);
1964
1965 /* Lock for manipulating tomoyo_query_list. */
1966 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1967
1968 /*
1969 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1970 * interface.
1971 */
1972 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1973
1974 /**
1975 * tomoyo_truncate - Truncate a line.
1976 *
1977 * @str: String to truncate.
1978 *
1979 * Returns length of truncated @str.
1980 */
tomoyo_truncate(char * str)1981 static int tomoyo_truncate(char *str)
1982 {
1983 char *start = str;
1984
1985 while (*(unsigned char *) str > (unsigned char) ' ')
1986 str++;
1987 *str = '\0';
1988 return strlen(start) + 1;
1989 }
1990
1991 /**
1992 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1993 *
1994 * @domain: Pointer to "struct tomoyo_domain_info".
1995 * @header: Lines containing ACL.
1996 *
1997 * Returns nothing.
1998 */
tomoyo_add_entry(struct tomoyo_domain_info * domain,char * header)1999 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
2000 {
2001 char *buffer;
2002 char *realpath = NULL;
2003 char *argv0 = NULL;
2004 char *symlink = NULL;
2005 char *cp = strchr(header, '\n');
2006 int len;
2007
2008 if (!cp)
2009 return;
2010 cp = strchr(cp + 1, '\n');
2011 if (!cp)
2012 return;
2013 *cp++ = '\0';
2014 len = strlen(cp) + 1;
2015 /* strstr() will return NULL if ordering is wrong. */
2016 if (*cp == 'f') {
2017 argv0 = strstr(header, " argv[]={ \"");
2018 if (argv0) {
2019 argv0 += 10;
2020 len += tomoyo_truncate(argv0) + 14;
2021 }
2022 realpath = strstr(header, " exec={ realpath=\"");
2023 if (realpath) {
2024 realpath += 8;
2025 len += tomoyo_truncate(realpath) + 6;
2026 }
2027 symlink = strstr(header, " symlink.target=\"");
2028 if (symlink)
2029 len += tomoyo_truncate(symlink + 1) + 1;
2030 }
2031 buffer = kmalloc(len, GFP_NOFS);
2032 if (!buffer)
2033 return;
2034 snprintf(buffer, len - 1, "%s", cp);
2035 if (realpath)
2036 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2037 if (argv0)
2038 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2039 if (symlink)
2040 tomoyo_addprintf(buffer, len, "%s", symlink);
2041 tomoyo_normalize_line(buffer);
2042 if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2043 false))
2044 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2045 kfree(buffer);
2046 }
2047
2048 /**
2049 * tomoyo_supervisor - Ask for the supervisor's decision.
2050 *
2051 * @r: Pointer to "struct tomoyo_request_info".
2052 * @fmt: The printf()'s format string, followed by parameters.
2053 *
2054 * Returns 0 if the supervisor decided to permit the access request which
2055 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2056 * supervisor decided to retry the access request which violated the policy in
2057 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2058 */
tomoyo_supervisor(struct tomoyo_request_info * r,const char * fmt,...)2059 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2060 {
2061 va_list args;
2062 int error;
2063 int len;
2064 static unsigned int tomoyo_serial;
2065 struct tomoyo_query entry = { };
2066 bool quota_exceeded = false;
2067
2068 va_start(args, fmt);
2069 len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2070 va_end(args);
2071 /* Write /sys/kernel/security/tomoyo/audit. */
2072 va_start(args, fmt);
2073 tomoyo_write_log2(r, len, fmt, args);
2074 va_end(args);
2075 /* Nothing more to do if granted. */
2076 if (r->granted)
2077 return 0;
2078 if (r->mode)
2079 tomoyo_update_stat(r->mode);
2080 switch (r->mode) {
2081 case TOMOYO_CONFIG_ENFORCING:
2082 error = -EPERM;
2083 if (atomic_read(&tomoyo_query_observers))
2084 break;
2085 goto out;
2086 case TOMOYO_CONFIG_LEARNING:
2087 error = 0;
2088 /* Check max_learning_entry parameter. */
2089 if (tomoyo_domain_quota_is_ok(r))
2090 break;
2091 /* fall through */
2092 default:
2093 return 0;
2094 }
2095 /* Get message. */
2096 va_start(args, fmt);
2097 entry.query = tomoyo_init_log(r, len, fmt, args);
2098 va_end(args);
2099 if (!entry.query)
2100 goto out;
2101 entry.query_len = strlen(entry.query) + 1;
2102 if (!error) {
2103 tomoyo_add_entry(r->domain, entry.query);
2104 goto out;
2105 }
2106 len = tomoyo_round2(entry.query_len);
2107 entry.domain = r->domain;
2108 spin_lock(&tomoyo_query_list_lock);
2109 if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2110 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2111 >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2112 quota_exceeded = true;
2113 } else {
2114 entry.serial = tomoyo_serial++;
2115 entry.retry = r->retry;
2116 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2117 list_add_tail(&entry.list, &tomoyo_query_list);
2118 }
2119 spin_unlock(&tomoyo_query_list_lock);
2120 if (quota_exceeded)
2121 goto out;
2122 /* Give 10 seconds for supervisor's opinion. */
2123 while (entry.timer < 10) {
2124 wake_up_all(&tomoyo_query_wait);
2125 if (wait_event_interruptible_timeout
2126 (tomoyo_answer_wait, entry.answer ||
2127 !atomic_read(&tomoyo_query_observers), HZ))
2128 break;
2129 entry.timer++;
2130 }
2131 spin_lock(&tomoyo_query_list_lock);
2132 list_del(&entry.list);
2133 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2134 spin_unlock(&tomoyo_query_list_lock);
2135 switch (entry.answer) {
2136 case 3: /* Asked to retry by administrator. */
2137 error = TOMOYO_RETRY_REQUEST;
2138 r->retry++;
2139 break;
2140 case 1:
2141 /* Granted by administrator. */
2142 error = 0;
2143 break;
2144 default:
2145 /* Timed out or rejected by administrator. */
2146 break;
2147 }
2148 out:
2149 kfree(entry.query);
2150 return error;
2151 }
2152
2153 /**
2154 * tomoyo_find_domain_by_qid - Get domain by query id.
2155 *
2156 * @serial: Query ID assigned by tomoyo_supervisor().
2157 *
2158 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2159 */
tomoyo_find_domain_by_qid(unsigned int serial)2160 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2161 (unsigned int serial)
2162 {
2163 struct tomoyo_query *ptr;
2164 struct tomoyo_domain_info *domain = NULL;
2165
2166 spin_lock(&tomoyo_query_list_lock);
2167 list_for_each_entry(ptr, &tomoyo_query_list, list) {
2168 if (ptr->serial != serial)
2169 continue;
2170 domain = ptr->domain;
2171 break;
2172 }
2173 spin_unlock(&tomoyo_query_list_lock);
2174 return domain;
2175 }
2176
2177 /**
2178 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2179 *
2180 * @file: Pointer to "struct file".
2181 * @wait: Pointer to "poll_table".
2182 *
2183 * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2184 *
2185 * Waits for access requests which violated policy in enforcing mode.
2186 */
tomoyo_poll_query(struct file * file,poll_table * wait)2187 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2188 {
2189 if (!list_empty(&tomoyo_query_list))
2190 return EPOLLIN | EPOLLRDNORM;
2191 poll_wait(file, &tomoyo_query_wait, wait);
2192 if (!list_empty(&tomoyo_query_list))
2193 return EPOLLIN | EPOLLRDNORM;
2194 return 0;
2195 }
2196
2197 /**
2198 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2199 *
2200 * @head: Pointer to "struct tomoyo_io_buffer".
2201 */
tomoyo_read_query(struct tomoyo_io_buffer * head)2202 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2203 {
2204 struct list_head *tmp;
2205 unsigned int pos = 0;
2206 size_t len = 0;
2207 char *buf;
2208
2209 if (head->r.w_pos)
2210 return;
2211 kfree(head->read_buf);
2212 head->read_buf = NULL;
2213 spin_lock(&tomoyo_query_list_lock);
2214 list_for_each(tmp, &tomoyo_query_list) {
2215 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2216
2217 if (pos++ != head->r.query_index)
2218 continue;
2219 len = ptr->query_len;
2220 break;
2221 }
2222 spin_unlock(&tomoyo_query_list_lock);
2223 if (!len) {
2224 head->r.query_index = 0;
2225 return;
2226 }
2227 buf = kzalloc(len + 32, GFP_NOFS);
2228 if (!buf)
2229 return;
2230 pos = 0;
2231 spin_lock(&tomoyo_query_list_lock);
2232 list_for_each(tmp, &tomoyo_query_list) {
2233 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2234
2235 if (pos++ != head->r.query_index)
2236 continue;
2237 /*
2238 * Some query can be skipped because tomoyo_query_list
2239 * can change, but I don't care.
2240 */
2241 if (len == ptr->query_len)
2242 snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2243 ptr->retry, ptr->query);
2244 break;
2245 }
2246 spin_unlock(&tomoyo_query_list_lock);
2247 if (buf[0]) {
2248 head->read_buf = buf;
2249 head->r.w[head->r.w_pos++] = buf;
2250 head->r.query_index++;
2251 } else {
2252 kfree(buf);
2253 }
2254 }
2255
2256 /**
2257 * tomoyo_write_answer - Write the supervisor's decision.
2258 *
2259 * @head: Pointer to "struct tomoyo_io_buffer".
2260 *
2261 * Returns 0 on success, -EINVAL otherwise.
2262 */
tomoyo_write_answer(struct tomoyo_io_buffer * head)2263 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2264 {
2265 char *data = head->write_buf;
2266 struct list_head *tmp;
2267 unsigned int serial;
2268 unsigned int answer;
2269
2270 spin_lock(&tomoyo_query_list_lock);
2271 list_for_each(tmp, &tomoyo_query_list) {
2272 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2273
2274 ptr->timer = 0;
2275 }
2276 spin_unlock(&tomoyo_query_list_lock);
2277 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2278 return -EINVAL;
2279 spin_lock(&tomoyo_query_list_lock);
2280 list_for_each(tmp, &tomoyo_query_list) {
2281 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2282
2283 if (ptr->serial != serial)
2284 continue;
2285 ptr->answer = answer;
2286 /* Remove from tomoyo_query_list. */
2287 if (ptr->answer)
2288 list_del_init(&ptr->list);
2289 break;
2290 }
2291 spin_unlock(&tomoyo_query_list_lock);
2292 return 0;
2293 }
2294
2295 /**
2296 * tomoyo_read_version: Get version.
2297 *
2298 * @head: Pointer to "struct tomoyo_io_buffer".
2299 *
2300 * Returns version information.
2301 */
tomoyo_read_version(struct tomoyo_io_buffer * head)2302 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2303 {
2304 if (!head->r.eof) {
2305 tomoyo_io_printf(head, "2.6.0");
2306 head->r.eof = true;
2307 }
2308 }
2309
2310 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2311 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2312 [TOMOYO_STAT_POLICY_UPDATES] = "update:",
2313 [TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2314 [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2315 [TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2316 };
2317
2318 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2319 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2320 [TOMOYO_MEMORY_POLICY] = "policy:",
2321 [TOMOYO_MEMORY_AUDIT] = "audit log:",
2322 [TOMOYO_MEMORY_QUERY] = "query message:",
2323 };
2324
2325 /* Timestamp counter for last updated. */
2326 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2327 /* Counter for number of updates. */
2328 static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2329
2330 /**
2331 * tomoyo_update_stat - Update statistic counters.
2332 *
2333 * @index: Index for policy type.
2334 *
2335 * Returns nothing.
2336 */
tomoyo_update_stat(const u8 index)2337 void tomoyo_update_stat(const u8 index)
2338 {
2339 /*
2340 * I don't use atomic operations because race condition is not fatal.
2341 */
2342 tomoyo_stat_updated[index]++;
2343 tomoyo_stat_modified[index] = ktime_get_real_seconds();
2344 }
2345
2346 /**
2347 * tomoyo_read_stat - Read statistic data.
2348 *
2349 * @head: Pointer to "struct tomoyo_io_buffer".
2350 *
2351 * Returns nothing.
2352 */
tomoyo_read_stat(struct tomoyo_io_buffer * head)2353 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2354 {
2355 u8 i;
2356 unsigned int total = 0;
2357
2358 if (head->r.eof)
2359 return;
2360 for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2361 tomoyo_io_printf(head, "Policy %-30s %10u",
2362 tomoyo_policy_headers[i],
2363 tomoyo_stat_updated[i]);
2364 if (tomoyo_stat_modified[i]) {
2365 struct tomoyo_time stamp;
2366
2367 tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2368 tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2369 stamp.year, stamp.month, stamp.day,
2370 stamp.hour, stamp.min, stamp.sec);
2371 }
2372 tomoyo_set_lf(head);
2373 }
2374 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2375 unsigned int used = tomoyo_memory_used[i];
2376
2377 total += used;
2378 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2379 tomoyo_memory_headers[i], used);
2380 used = tomoyo_memory_quota[i];
2381 if (used)
2382 tomoyo_io_printf(head, " (Quota: %10u)", used);
2383 tomoyo_set_lf(head);
2384 }
2385 tomoyo_io_printf(head, "Total memory used: %10u\n",
2386 total);
2387 head->r.eof = true;
2388 }
2389
2390 /**
2391 * tomoyo_write_stat - Set memory quota.
2392 *
2393 * @head: Pointer to "struct tomoyo_io_buffer".
2394 *
2395 * Returns 0.
2396 */
tomoyo_write_stat(struct tomoyo_io_buffer * head)2397 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2398 {
2399 char *data = head->write_buf;
2400 u8 i;
2401
2402 if (tomoyo_str_starts(&data, "Memory used by "))
2403 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2404 if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2405 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2406 return 0;
2407 }
2408
2409 /**
2410 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2411 *
2412 * @type: Type of interface.
2413 * @file: Pointer to "struct file".
2414 *
2415 * Returns 0 on success, negative value otherwise.
2416 */
tomoyo_open_control(const u8 type,struct file * file)2417 int tomoyo_open_control(const u8 type, struct file *file)
2418 {
2419 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2420
2421 if (!head)
2422 return -ENOMEM;
2423 mutex_init(&head->io_sem);
2424 head->type = type;
2425 switch (type) {
2426 case TOMOYO_DOMAINPOLICY:
2427 /* /sys/kernel/security/tomoyo/domain_policy */
2428 head->write = tomoyo_write_domain;
2429 head->read = tomoyo_read_domain;
2430 break;
2431 case TOMOYO_EXCEPTIONPOLICY:
2432 /* /sys/kernel/security/tomoyo/exception_policy */
2433 head->write = tomoyo_write_exception;
2434 head->read = tomoyo_read_exception;
2435 break;
2436 case TOMOYO_AUDIT:
2437 /* /sys/kernel/security/tomoyo/audit */
2438 head->poll = tomoyo_poll_log;
2439 head->read = tomoyo_read_log;
2440 break;
2441 case TOMOYO_PROCESS_STATUS:
2442 /* /sys/kernel/security/tomoyo/.process_status */
2443 head->write = tomoyo_write_pid;
2444 head->read = tomoyo_read_pid;
2445 break;
2446 case TOMOYO_VERSION:
2447 /* /sys/kernel/security/tomoyo/version */
2448 head->read = tomoyo_read_version;
2449 head->readbuf_size = 128;
2450 break;
2451 case TOMOYO_STAT:
2452 /* /sys/kernel/security/tomoyo/stat */
2453 head->write = tomoyo_write_stat;
2454 head->read = tomoyo_read_stat;
2455 head->readbuf_size = 1024;
2456 break;
2457 case TOMOYO_PROFILE:
2458 /* /sys/kernel/security/tomoyo/profile */
2459 head->write = tomoyo_write_profile;
2460 head->read = tomoyo_read_profile;
2461 break;
2462 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2463 head->poll = tomoyo_poll_query;
2464 head->write = tomoyo_write_answer;
2465 head->read = tomoyo_read_query;
2466 break;
2467 case TOMOYO_MANAGER:
2468 /* /sys/kernel/security/tomoyo/manager */
2469 head->write = tomoyo_write_manager;
2470 head->read = tomoyo_read_manager;
2471 break;
2472 }
2473 if (!(file->f_mode & FMODE_READ)) {
2474 /*
2475 * No need to allocate read_buf since it is not opened
2476 * for reading.
2477 */
2478 head->read = NULL;
2479 head->poll = NULL;
2480 } else if (!head->poll) {
2481 /* Don't allocate read_buf for poll() access. */
2482 if (!head->readbuf_size)
2483 head->readbuf_size = 4096 * 2;
2484 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2485 if (!head->read_buf) {
2486 kfree(head);
2487 return -ENOMEM;
2488 }
2489 }
2490 if (!(file->f_mode & FMODE_WRITE)) {
2491 /*
2492 * No need to allocate write_buf since it is not opened
2493 * for writing.
2494 */
2495 head->write = NULL;
2496 } else if (head->write) {
2497 head->writebuf_size = 4096 * 2;
2498 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2499 if (!head->write_buf) {
2500 kfree(head->read_buf);
2501 kfree(head);
2502 return -ENOMEM;
2503 }
2504 }
2505 /*
2506 * If the file is /sys/kernel/security/tomoyo/query , increment the
2507 * observer counter.
2508 * The obserber counter is used by tomoyo_supervisor() to see if
2509 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2510 */
2511 if (type == TOMOYO_QUERY)
2512 atomic_inc(&tomoyo_query_observers);
2513 file->private_data = head;
2514 tomoyo_notify_gc(head, true);
2515 return 0;
2516 }
2517
2518 /**
2519 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2520 *
2521 * @file: Pointer to "struct file".
2522 * @wait: Pointer to "poll_table". Maybe NULL.
2523 *
2524 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2525 * EPOLLOUT | EPOLLWRNORM otherwise.
2526 */
tomoyo_poll_control(struct file * file,poll_table * wait)2527 __poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2528 {
2529 struct tomoyo_io_buffer *head = file->private_data;
2530
2531 if (head->poll)
2532 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2533 return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2534 }
2535
2536 /**
2537 * tomoyo_set_namespace_cursor - Set namespace to read.
2538 *
2539 * @head: Pointer to "struct tomoyo_io_buffer".
2540 *
2541 * Returns nothing.
2542 */
tomoyo_set_namespace_cursor(struct tomoyo_io_buffer * head)2543 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2544 {
2545 struct list_head *ns;
2546
2547 if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2548 head->type != TOMOYO_PROFILE)
2549 return;
2550 /*
2551 * If this is the first read, or reading previous namespace finished
2552 * and has more namespaces to read, update the namespace cursor.
2553 */
2554 ns = head->r.ns;
2555 if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2556 /* Clearing is OK because tomoyo_flush() returned true. */
2557 memset(&head->r, 0, sizeof(head->r));
2558 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2559 }
2560 }
2561
2562 /**
2563 * tomoyo_has_more_namespace - Check for unread namespaces.
2564 *
2565 * @head: Pointer to "struct tomoyo_io_buffer".
2566 *
2567 * Returns true if we have more entries to print, false otherwise.
2568 */
tomoyo_has_more_namespace(struct tomoyo_io_buffer * head)2569 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2570 {
2571 return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2572 head->type == TOMOYO_PROFILE) && head->r.eof &&
2573 head->r.ns->next != &tomoyo_namespace_list;
2574 }
2575
2576 /**
2577 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2578 *
2579 * @head: Pointer to "struct tomoyo_io_buffer".
2580 * @buffer: Poiner to buffer to write to.
2581 * @buffer_len: Size of @buffer.
2582 *
2583 * Returns bytes read on success, negative value otherwise.
2584 */
tomoyo_read_control(struct tomoyo_io_buffer * head,char __user * buffer,const int buffer_len)2585 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2586 const int buffer_len)
2587 {
2588 int len;
2589 int idx;
2590
2591 if (!head->read)
2592 return -EINVAL;
2593 if (mutex_lock_interruptible(&head->io_sem))
2594 return -EINTR;
2595 head->read_user_buf = buffer;
2596 head->read_user_buf_avail = buffer_len;
2597 idx = tomoyo_read_lock();
2598 if (tomoyo_flush(head))
2599 /* Call the policy handler. */
2600 do {
2601 tomoyo_set_namespace_cursor(head);
2602 head->read(head);
2603 } while (tomoyo_flush(head) &&
2604 tomoyo_has_more_namespace(head));
2605 tomoyo_read_unlock(idx);
2606 len = head->read_user_buf - buffer;
2607 mutex_unlock(&head->io_sem);
2608 return len;
2609 }
2610
2611 /**
2612 * tomoyo_parse_policy - Parse a policy line.
2613 *
2614 * @head: Poiter to "struct tomoyo_io_buffer".
2615 * @line: Line to parse.
2616 *
2617 * Returns 0 on success, negative value otherwise.
2618 *
2619 * Caller holds tomoyo_read_lock().
2620 */
tomoyo_parse_policy(struct tomoyo_io_buffer * head,char * line)2621 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2622 {
2623 /* Delete request? */
2624 head->w.is_delete = !strncmp(line, "delete ", 7);
2625 if (head->w.is_delete)
2626 memmove(line, line + 7, strlen(line + 7) + 1);
2627 /* Selecting namespace to update. */
2628 if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2629 head->type == TOMOYO_PROFILE) {
2630 if (*line == '<') {
2631 char *cp = strchr(line, ' ');
2632
2633 if (cp) {
2634 *cp++ = '\0';
2635 head->w.ns = tomoyo_assign_namespace(line);
2636 memmove(line, cp, strlen(cp) + 1);
2637 } else
2638 head->w.ns = NULL;
2639 } else
2640 head->w.ns = &tomoyo_kernel_namespace;
2641 /* Don't allow updating if namespace is invalid. */
2642 if (!head->w.ns)
2643 return -ENOENT;
2644 }
2645 /* Do the update. */
2646 return head->write(head);
2647 }
2648
2649 /**
2650 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2651 *
2652 * @head: Pointer to "struct tomoyo_io_buffer".
2653 * @buffer: Pointer to buffer to read from.
2654 * @buffer_len: Size of @buffer.
2655 *
2656 * Returns @buffer_len on success, negative value otherwise.
2657 */
tomoyo_write_control(struct tomoyo_io_buffer * head,const char __user * buffer,const int buffer_len)2658 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2659 const char __user *buffer, const int buffer_len)
2660 {
2661 int error = buffer_len;
2662 size_t avail_len = buffer_len;
2663 char *cp0 = head->write_buf;
2664 int idx;
2665
2666 if (!head->write)
2667 return -EINVAL;
2668 if (!access_ok(buffer, buffer_len))
2669 return -EFAULT;
2670 if (mutex_lock_interruptible(&head->io_sem))
2671 return -EINTR;
2672 head->read_user_buf_avail = 0;
2673 idx = tomoyo_read_lock();
2674 /* Read a line and dispatch it to the policy handler. */
2675 while (avail_len > 0) {
2676 char c;
2677
2678 if (head->w.avail >= head->writebuf_size - 1) {
2679 const int len = head->writebuf_size * 2;
2680 char *cp = kzalloc(len, GFP_NOFS);
2681
2682 if (!cp) {
2683 error = -ENOMEM;
2684 break;
2685 }
2686 memmove(cp, cp0, head->w.avail);
2687 kfree(cp0);
2688 head->write_buf = cp;
2689 cp0 = cp;
2690 head->writebuf_size = len;
2691 }
2692 if (get_user(c, buffer)) {
2693 error = -EFAULT;
2694 break;
2695 }
2696 buffer++;
2697 avail_len--;
2698 cp0[head->w.avail++] = c;
2699 if (c != '\n')
2700 continue;
2701 cp0[head->w.avail - 1] = '\0';
2702 head->w.avail = 0;
2703 tomoyo_normalize_line(cp0);
2704 if (!strcmp(cp0, "reset")) {
2705 head->w.ns = &tomoyo_kernel_namespace;
2706 head->w.domain = NULL;
2707 memset(&head->r, 0, sizeof(head->r));
2708 continue;
2709 }
2710 /* Don't allow updating policies by non manager programs. */
2711 switch (head->type) {
2712 case TOMOYO_PROCESS_STATUS:
2713 /* This does not write anything. */
2714 break;
2715 case TOMOYO_DOMAINPOLICY:
2716 if (tomoyo_select_domain(head, cp0))
2717 continue;
2718 /* fall through */
2719 case TOMOYO_EXCEPTIONPOLICY:
2720 if (!strcmp(cp0, "select transition_only")) {
2721 head->r.print_transition_related_only = true;
2722 continue;
2723 }
2724 /* fall through */
2725 default:
2726 if (!tomoyo_manager()) {
2727 error = -EPERM;
2728 goto out;
2729 }
2730 }
2731 switch (tomoyo_parse_policy(head, cp0)) {
2732 case -EPERM:
2733 error = -EPERM;
2734 goto out;
2735 case 0:
2736 switch (head->type) {
2737 case TOMOYO_DOMAINPOLICY:
2738 case TOMOYO_EXCEPTIONPOLICY:
2739 case TOMOYO_STAT:
2740 case TOMOYO_PROFILE:
2741 case TOMOYO_MANAGER:
2742 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2743 break;
2744 default:
2745 break;
2746 }
2747 break;
2748 }
2749 }
2750 out:
2751 tomoyo_read_unlock(idx);
2752 mutex_unlock(&head->io_sem);
2753 return error;
2754 }
2755
2756 /**
2757 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2758 *
2759 * @head: Pointer to "struct tomoyo_io_buffer".
2760 */
tomoyo_close_control(struct tomoyo_io_buffer * head)2761 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2762 {
2763 /*
2764 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2765 * observer counter.
2766 */
2767 if (head->type == TOMOYO_QUERY &&
2768 atomic_dec_and_test(&tomoyo_query_observers))
2769 wake_up_all(&tomoyo_answer_wait);
2770 tomoyo_notify_gc(head, false);
2771 }
2772
2773 /**
2774 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2775 */
tomoyo_check_profile(void)2776 void tomoyo_check_profile(void)
2777 {
2778 struct tomoyo_domain_info *domain;
2779 const int idx = tomoyo_read_lock();
2780
2781 tomoyo_policy_loaded = true;
2782 pr_info("TOMOYO: 2.6.0\n");
2783 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2784 srcu_read_lock_held(&tomoyo_ss)) {
2785 const u8 profile = domain->profile;
2786 struct tomoyo_policy_namespace *ns = domain->ns;
2787
2788 if (ns->profile_version == 20110903) {
2789 pr_info_once("Converting profile version from %u to %u.\n",
2790 20110903, 20150505);
2791 ns->profile_version = 20150505;
2792 }
2793 if (ns->profile_version != 20150505)
2794 pr_err("Profile version %u is not supported.\n",
2795 ns->profile_version);
2796 else if (!ns->profile_ptr[profile])
2797 pr_err("Profile %u (used by '%s') is not defined.\n",
2798 profile, domain->domainname->name);
2799 else
2800 continue;
2801 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2802 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2803 panic("STOP!");
2804 }
2805 tomoyo_read_unlock(idx);
2806 pr_info("Mandatory Access Control activated.\n");
2807 }
2808
2809 /**
2810 * tomoyo_load_builtin_policy - Load built-in policy.
2811 *
2812 * Returns nothing.
2813 */
tomoyo_load_builtin_policy(void)2814 void __init tomoyo_load_builtin_policy(void)
2815 {
2816 #ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2817 static char tomoyo_builtin_profile[] __initdata =
2818 "PROFILE_VERSION=20150505\n"
2819 "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2820 static char tomoyo_builtin_exception_policy[] __initdata =
2821 "aggregator proc:/self/exe /proc/self/exe\n";
2822 static char tomoyo_builtin_domain_policy[] __initdata = "";
2823 static char tomoyo_builtin_manager[] __initdata = "";
2824 static char tomoyo_builtin_stat[] __initdata = "";
2825 #else
2826 /*
2827 * This include file is manually created and contains built-in policy
2828 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2829 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2830 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2831 */
2832 #include "builtin-policy.h"
2833 #endif
2834 u8 i;
2835 const int idx = tomoyo_read_lock();
2836
2837 for (i = 0; i < 5; i++) {
2838 struct tomoyo_io_buffer head = { };
2839 char *start = "";
2840
2841 switch (i) {
2842 case 0:
2843 start = tomoyo_builtin_profile;
2844 head.type = TOMOYO_PROFILE;
2845 head.write = tomoyo_write_profile;
2846 break;
2847 case 1:
2848 start = tomoyo_builtin_exception_policy;
2849 head.type = TOMOYO_EXCEPTIONPOLICY;
2850 head.write = tomoyo_write_exception;
2851 break;
2852 case 2:
2853 start = tomoyo_builtin_domain_policy;
2854 head.type = TOMOYO_DOMAINPOLICY;
2855 head.write = tomoyo_write_domain;
2856 break;
2857 case 3:
2858 start = tomoyo_builtin_manager;
2859 head.type = TOMOYO_MANAGER;
2860 head.write = tomoyo_write_manager;
2861 break;
2862 case 4:
2863 start = tomoyo_builtin_stat;
2864 head.type = TOMOYO_STAT;
2865 head.write = tomoyo_write_stat;
2866 break;
2867 }
2868 while (1) {
2869 char *end = strchr(start, '\n');
2870
2871 if (!end)
2872 break;
2873 *end = '\0';
2874 tomoyo_normalize_line(start);
2875 head.write_buf = start;
2876 tomoyo_parse_policy(&head, start);
2877 start = end + 1;
2878 }
2879 }
2880 tomoyo_read_unlock(idx);
2881 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2882 tomoyo_check_profile();
2883 #endif
2884 }
2885