• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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  */
tomoyo_yesno(const unsigned int value)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  */
tomoyo_addprintf(char * buffer,int len,const char * fmt,...)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  */
tomoyo_flush(struct tomoyo_io_buffer * head)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  */
tomoyo_set_string(struct tomoyo_io_buffer * head,const char * string)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  */
tomoyo_io_printf(struct tomoyo_io_buffer * head,const char * fmt,...)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  */
tomoyo_set_space(struct tomoyo_io_buffer * head)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  */
tomoyo_set_lf(struct tomoyo_io_buffer * head)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  */
tomoyo_set_slash(struct tomoyo_io_buffer * head)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  */
tomoyo_init_policy_namespace(struct tomoyo_policy_namespace * ns)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  */
tomoyo_print_namespace(struct tomoyo_io_buffer * head)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  */
tomoyo_print_name_union(struct tomoyo_io_buffer * head,const struct tomoyo_name_union * ptr)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  */
tomoyo_print_name_union_quoted(struct tomoyo_io_buffer * head,const struct tomoyo_name_union * ptr)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  */
tomoyo_print_number_union_nospace(struct tomoyo_io_buffer * head,const struct tomoyo_number_union * ptr)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  */
tomoyo_print_number_union(struct tomoyo_io_buffer * head,const struct tomoyo_number_union * ptr)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  */
tomoyo_assign_profile(struct tomoyo_policy_namespace * ns,const unsigned int profile)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  */
tomoyo_profile(const struct tomoyo_policy_namespace * ns,const u8 profile)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  */
tomoyo_find_yesno(const char * string,const char * find)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  */
tomoyo_set_uint(unsigned int * i,const char * string,const char * find)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  */
tomoyo_set_mode(char * name,const char * value,struct tomoyo_profile * profile)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  */
tomoyo_write_profile(struct tomoyo_io_buffer * head)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  */
tomoyo_print_config(struct tomoyo_io_buffer * head,const u8 config)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  */
tomoyo_read_profile(struct tomoyo_io_buffer * head)728 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
729 {
730 	u8 index;
731 	struct tomoyo_policy_namespace *ns =
732 		container_of(head->r.ns, typeof(*ns), namespace_list);
733 	const struct tomoyo_profile *profile;
734 	if (head->r.eof)
735 		return;
736  next:
737 	index = head->r.index;
738 	profile = ns->profile_ptr[index];
739 	switch (head->r.step) {
740 	case 0:
741 		tomoyo_print_namespace(head);
742 		tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
743 				 ns->profile_version);
744 		head->r.step++;
745 		break;
746 	case 1:
747 		for ( ; head->r.index < TOMOYO_MAX_PROFILES;
748 		      head->r.index++)
749 			if (ns->profile_ptr[head->r.index])
750 				break;
751 		if (head->r.index == TOMOYO_MAX_PROFILES) {
752 			head->r.eof = true;
753 			return;
754 		}
755 		head->r.step++;
756 		break;
757 	case 2:
758 		{
759 			u8 i;
760 			const struct tomoyo_path_info *comment =
761 				profile->comment;
762 			tomoyo_print_namespace(head);
763 			tomoyo_io_printf(head, "%u-COMMENT=", index);
764 			tomoyo_set_string(head, comment ? comment->name : "");
765 			tomoyo_set_lf(head);
766 			tomoyo_print_namespace(head);
767 			tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
768 			for (i = 0; i < TOMOYO_MAX_PREF; i++)
769 				tomoyo_io_printf(head, "%s=%u ",
770 						 tomoyo_pref_keywords[i],
771 						 profile->pref[i]);
772 			tomoyo_set_string(head, "}\n");
773 			head->r.step++;
774 		}
775 		break;
776 	case 3:
777 		{
778 			tomoyo_print_namespace(head);
779 			tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
780 			tomoyo_print_config(head, profile->default_config);
781 			head->r.bit = 0;
782 			head->r.step++;
783 		}
784 		break;
785 	case 4:
786 		for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
787 			      + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
788 			const u8 i = head->r.bit;
789 			const u8 config = profile->config[i];
790 			if (config == TOMOYO_CONFIG_USE_DEFAULT)
791 				continue;
792 			tomoyo_print_namespace(head);
793 			if (i < TOMOYO_MAX_MAC_INDEX)
794 				tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
795 						 index,
796 						 tomoyo_category_keywords
797 						 [tomoyo_index2category[i]],
798 						 tomoyo_mac_keywords[i]);
799 			else
800 				tomoyo_io_printf(head, "%u-CONFIG::%s", index,
801 						 tomoyo_mac_keywords[i]);
802 			tomoyo_print_config(head, config);
803 			head->r.bit++;
804 			break;
805 		}
806 		if (head->r.bit == TOMOYO_MAX_MAC_INDEX
807 		    + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
808 			head->r.index++;
809 			head->r.step = 1;
810 		}
811 		break;
812 	}
813 	if (tomoyo_flush(head))
814 		goto next;
815 }
816 
817 /**
818  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
819  *
820  * @a: Pointer to "struct tomoyo_acl_head".
821  * @b: Pointer to "struct tomoyo_acl_head".
822  *
823  * Returns true if @a == @b, false otherwise.
824  */
tomoyo_same_manager(const struct tomoyo_acl_head * a,const struct tomoyo_acl_head * b)825 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
826 				const struct tomoyo_acl_head *b)
827 {
828 	return container_of(a, struct tomoyo_manager, head)->manager ==
829 		container_of(b, struct tomoyo_manager, head)->manager;
830 }
831 
832 /**
833  * tomoyo_update_manager_entry - Add a manager entry.
834  *
835  * @manager:   The path to manager or the domainnamme.
836  * @is_delete: True if it is a delete request.
837  *
838  * Returns 0 on success, negative value otherwise.
839  *
840  * Caller holds tomoyo_read_lock().
841  */
tomoyo_update_manager_entry(const char * manager,const bool is_delete)842 static int tomoyo_update_manager_entry(const char *manager,
843 				       const bool is_delete)
844 {
845 	struct tomoyo_manager e = { };
846 	struct tomoyo_acl_param param = {
847 		/* .ns = &tomoyo_kernel_namespace, */
848 		.is_delete = is_delete,
849 		.list = &tomoyo_kernel_namespace.
850 		policy_list[TOMOYO_ID_MANAGER],
851 	};
852 	int error = is_delete ? -ENOENT : -ENOMEM;
853 	if (!tomoyo_correct_domain(manager) &&
854 	    !tomoyo_correct_word(manager))
855 		return -EINVAL;
856 	e.manager = tomoyo_get_name(manager);
857 	if (e.manager) {
858 		error = tomoyo_update_policy(&e.head, sizeof(e), &param,
859 					     tomoyo_same_manager);
860 		tomoyo_put_name(e.manager);
861 	}
862 	return error;
863 }
864 
865 /**
866  * tomoyo_write_manager - Write manager policy.
867  *
868  * @head: Pointer to "struct tomoyo_io_buffer".
869  *
870  * Returns 0 on success, negative value otherwise.
871  *
872  * Caller holds tomoyo_read_lock().
873  */
tomoyo_write_manager(struct tomoyo_io_buffer * head)874 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
875 {
876 	char *data = head->write_buf;
877 
878 	if (!strcmp(data, "manage_by_non_root")) {
879 		tomoyo_manage_by_non_root = !head->w.is_delete;
880 		return 0;
881 	}
882 	return tomoyo_update_manager_entry(data, head->w.is_delete);
883 }
884 
885 /**
886  * tomoyo_read_manager - Read manager policy.
887  *
888  * @head: Pointer to "struct tomoyo_io_buffer".
889  *
890  * Caller holds tomoyo_read_lock().
891  */
tomoyo_read_manager(struct tomoyo_io_buffer * head)892 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
893 {
894 	if (head->r.eof)
895 		return;
896 	list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
897 			     policy_list[TOMOYO_ID_MANAGER]) {
898 		struct tomoyo_manager *ptr =
899 			list_entry(head->r.acl, typeof(*ptr), head.list);
900 		if (ptr->head.is_deleted)
901 			continue;
902 		if (!tomoyo_flush(head))
903 			return;
904 		tomoyo_set_string(head, ptr->manager->name);
905 		tomoyo_set_lf(head);
906 	}
907 	head->r.eof = true;
908 }
909 
910 /**
911  * tomoyo_manager - Check whether the current process is a policy manager.
912  *
913  * Returns true if the current process is permitted to modify policy
914  * via /sys/kernel/security/tomoyo/ interface.
915  *
916  * Caller holds tomoyo_read_lock().
917  */
tomoyo_manager(void)918 static bool tomoyo_manager(void)
919 {
920 	struct tomoyo_manager *ptr;
921 	const char *exe;
922 	const struct task_struct *task = current;
923 	const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
924 	bool found = false;
925 
926 	if (!tomoyo_policy_loaded)
927 		return true;
928 	if (!tomoyo_manage_by_non_root &&
929 	    (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
930 	     !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
931 		return false;
932 	exe = tomoyo_get_exe();
933 	if (!exe)
934 		return false;
935 	list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
936 				policy_list[TOMOYO_ID_MANAGER], head.list) {
937 		if (!ptr->head.is_deleted &&
938 		    (!tomoyo_pathcmp(domainname, ptr->manager) ||
939 		     !strcmp(exe, ptr->manager->name))) {
940 			found = true;
941 			break;
942 		}
943 	}
944 	if (!found) { /* Reduce error messages. */
945 		static pid_t last_pid;
946 		const pid_t pid = current->pid;
947 		if (last_pid != pid) {
948 			printk(KERN_WARNING "%s ( %s ) is not permitted to "
949 			       "update policies.\n", domainname->name, exe);
950 			last_pid = pid;
951 		}
952 	}
953 	kfree(exe);
954 	return found;
955 }
956 
957 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
958 (unsigned int serial);
959 
960 /**
961  * tomoyo_select_domain - Parse select command.
962  *
963  * @head: Pointer to "struct tomoyo_io_buffer".
964  * @data: String to parse.
965  *
966  * Returns true on success, false otherwise.
967  *
968  * Caller holds tomoyo_read_lock().
969  */
tomoyo_select_domain(struct tomoyo_io_buffer * head,const char * data)970 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
971 				 const char *data)
972 {
973 	unsigned int pid;
974 	struct tomoyo_domain_info *domain = NULL;
975 	bool global_pid = false;
976 	if (strncmp(data, "select ", 7))
977 		return false;
978 	data += 7;
979 	if (sscanf(data, "pid=%u", &pid) == 1 ||
980 	    (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
981 		struct task_struct *p;
982 		rcu_read_lock();
983 		if (global_pid)
984 			p = find_task_by_pid_ns(pid, &init_pid_ns);
985 		else
986 			p = find_task_by_vpid(pid);
987 		if (p)
988 			domain = tomoyo_real_domain(p);
989 		rcu_read_unlock();
990 	} else if (!strncmp(data, "domain=", 7)) {
991 		if (tomoyo_domain_def(data + 7))
992 			domain = tomoyo_find_domain(data + 7);
993 	} else if (sscanf(data, "Q=%u", &pid) == 1) {
994 		domain = tomoyo_find_domain_by_qid(pid);
995 	} else
996 		return false;
997 	head->w.domain = domain;
998 	/* Accessing read_buf is safe because head->io_sem is held. */
999 	if (!head->read_buf)
1000 		return true; /* Do nothing if open(O_WRONLY). */
1001 	memset(&head->r, 0, sizeof(head->r));
1002 	head->r.print_this_domain_only = true;
1003 	if (domain)
1004 		head->r.domain = &domain->list;
1005 	else
1006 		head->r.eof = 1;
1007 	tomoyo_io_printf(head, "# select %s\n", data);
1008 	if (domain && domain->is_deleted)
1009 		tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010 	return true;
1011 }
1012 
1013 /**
1014  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1015  *
1016  * @a: Pointer to "struct tomoyo_acl_info".
1017  * @b: Pointer to "struct tomoyo_acl_info".
1018  *
1019  * Returns true if @a == @b, false otherwise.
1020  */
tomoyo_same_task_acl(const struct tomoyo_acl_info * a,const struct tomoyo_acl_info * b)1021 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1022 			      const struct tomoyo_acl_info *b)
1023 {
1024 	const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1025 	const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1026 	return p1->domainname == p2->domainname;
1027 }
1028 
1029 /**
1030  * tomoyo_write_task - Update task related list.
1031  *
1032  * @param: Pointer to "struct tomoyo_acl_param".
1033  *
1034  * Returns 0 on success, negative value otherwise.
1035  *
1036  * Caller holds tomoyo_read_lock().
1037  */
tomoyo_write_task(struct tomoyo_acl_param * param)1038 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1039 {
1040 	int error = -EINVAL;
1041 	if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1042 		struct tomoyo_task_acl e = {
1043 			.head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1044 			.domainname = tomoyo_get_domainname(param),
1045 		};
1046 		if (e.domainname)
1047 			error = tomoyo_update_domain(&e.head, sizeof(e), param,
1048 						     tomoyo_same_task_acl,
1049 						     NULL);
1050 		tomoyo_put_name(e.domainname);
1051 	}
1052 	return error;
1053 }
1054 
1055 /**
1056  * tomoyo_delete_domain - Delete a domain.
1057  *
1058  * @domainname: The name of domain.
1059  *
1060  * Returns 0 on success, negative value otherwise.
1061  *
1062  * Caller holds tomoyo_read_lock().
1063  */
tomoyo_delete_domain(char * domainname)1064 static int tomoyo_delete_domain(char *domainname)
1065 {
1066 	struct tomoyo_domain_info *domain;
1067 	struct tomoyo_path_info name;
1068 
1069 	name.name = domainname;
1070 	tomoyo_fill_path_info(&name);
1071 	if (mutex_lock_interruptible(&tomoyo_policy_lock))
1072 		return -EINTR;
1073 	/* Is there an active domain? */
1074 	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1075 		/* Never delete tomoyo_kernel_domain */
1076 		if (domain == &tomoyo_kernel_domain)
1077 			continue;
1078 		if (domain->is_deleted ||
1079 		    tomoyo_pathcmp(domain->domainname, &name))
1080 			continue;
1081 		domain->is_deleted = true;
1082 		break;
1083 	}
1084 	mutex_unlock(&tomoyo_policy_lock);
1085 	return 0;
1086 }
1087 
1088 /**
1089  * tomoyo_write_domain2 - Write domain policy.
1090  *
1091  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1092  * @list:      Pointer to "struct list_head".
1093  * @data:      Policy to be interpreted.
1094  * @is_delete: True if it is a delete request.
1095  *
1096  * Returns 0 on success, negative value otherwise.
1097  *
1098  * Caller holds tomoyo_read_lock().
1099  */
tomoyo_write_domain2(struct tomoyo_policy_namespace * ns,struct list_head * list,char * data,const bool is_delete)1100 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1101 				struct list_head *list, char *data,
1102 				const bool is_delete)
1103 {
1104 	struct tomoyo_acl_param param = {
1105 		.ns = ns,
1106 		.list = list,
1107 		.data = data,
1108 		.is_delete = is_delete,
1109 	};
1110 	static const struct {
1111 		const char *keyword;
1112 		int (*write) (struct tomoyo_acl_param *);
1113 	} tomoyo_callback[5] = {
1114 		{ "file ", tomoyo_write_file },
1115 		{ "network inet ", tomoyo_write_inet_network },
1116 		{ "network unix ", tomoyo_write_unix_network },
1117 		{ "misc ", tomoyo_write_misc },
1118 		{ "task ", tomoyo_write_task },
1119 	};
1120 	u8 i;
1121 
1122 	for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1123 		if (!tomoyo_str_starts(&param.data,
1124 				       tomoyo_callback[i].keyword))
1125 			continue;
1126 		return tomoyo_callback[i].write(&param);
1127 	}
1128 	return -EINVAL;
1129 }
1130 
1131 /* String table for domain flags. */
1132 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1133 	[TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1134 	[TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1135 };
1136 
1137 /**
1138  * tomoyo_write_domain - Write domain policy.
1139  *
1140  * @head: Pointer to "struct tomoyo_io_buffer".
1141  *
1142  * Returns 0 on success, negative value otherwise.
1143  *
1144  * Caller holds tomoyo_read_lock().
1145  */
tomoyo_write_domain(struct tomoyo_io_buffer * head)1146 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1147 {
1148 	char *data = head->write_buf;
1149 	struct tomoyo_policy_namespace *ns;
1150 	struct tomoyo_domain_info *domain = head->w.domain;
1151 	const bool is_delete = head->w.is_delete;
1152 	bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1153 	unsigned int profile;
1154 	if (*data == '<') {
1155 		int ret = 0;
1156 		domain = NULL;
1157 		if (is_delete)
1158 			ret = tomoyo_delete_domain(data);
1159 		else if (is_select)
1160 			domain = tomoyo_find_domain(data);
1161 		else
1162 			domain = tomoyo_assign_domain(data, false);
1163 		head->w.domain = domain;
1164 		return ret;
1165 	}
1166 	if (!domain)
1167 		return -EINVAL;
1168 	ns = domain->ns;
1169 	if (sscanf(data, "use_profile %u", &profile) == 1
1170 	    && profile < TOMOYO_MAX_PROFILES) {
1171 		if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1172 			domain->profile = (u8) profile;
1173 		return 0;
1174 	}
1175 	if (sscanf(data, "use_group %u\n", &profile) == 1
1176 	    && profile < TOMOYO_MAX_ACL_GROUPS) {
1177 		if (!is_delete)
1178 			domain->group = (u8) profile;
1179 		return 0;
1180 	}
1181 	for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1182 		const char *cp = tomoyo_dif[profile];
1183 		if (strncmp(data, cp, strlen(cp) - 1))
1184 			continue;
1185 		domain->flags[profile] = !is_delete;
1186 		return 0;
1187 	}
1188 	return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1189 				    is_delete);
1190 }
1191 
1192 /**
1193  * tomoyo_print_condition - Print condition part.
1194  *
1195  * @head: Pointer to "struct tomoyo_io_buffer".
1196  * @cond: Pointer to "struct tomoyo_condition".
1197  *
1198  * Returns true on success, false otherwise.
1199  */
tomoyo_print_condition(struct tomoyo_io_buffer * head,const struct tomoyo_condition * cond)1200 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1201 				   const struct tomoyo_condition *cond)
1202 {
1203 	switch (head->r.cond_step) {
1204 	case 0:
1205 		head->r.cond_index = 0;
1206 		head->r.cond_step++;
1207 		if (cond->transit) {
1208 			tomoyo_set_space(head);
1209 			tomoyo_set_string(head, cond->transit->name);
1210 		}
1211 		/* fall through */
1212 	case 1:
1213 		{
1214 			const u16 condc = cond->condc;
1215 			const struct tomoyo_condition_element *condp =
1216 				(typeof(condp)) (cond + 1);
1217 			const struct tomoyo_number_union *numbers_p =
1218 				(typeof(numbers_p)) (condp + condc);
1219 			const struct tomoyo_name_union *names_p =
1220 				(typeof(names_p))
1221 				(numbers_p + cond->numbers_count);
1222 			const struct tomoyo_argv *argv =
1223 				(typeof(argv)) (names_p + cond->names_count);
1224 			const struct tomoyo_envp *envp =
1225 				(typeof(envp)) (argv + cond->argc);
1226 			u16 skip;
1227 			for (skip = 0; skip < head->r.cond_index; skip++) {
1228 				const u8 left = condp->left;
1229 				const u8 right = condp->right;
1230 				condp++;
1231 				switch (left) {
1232 				case TOMOYO_ARGV_ENTRY:
1233 					argv++;
1234 					continue;
1235 				case TOMOYO_ENVP_ENTRY:
1236 					envp++;
1237 					continue;
1238 				case TOMOYO_NUMBER_UNION:
1239 					numbers_p++;
1240 					break;
1241 				}
1242 				switch (right) {
1243 				case TOMOYO_NAME_UNION:
1244 					names_p++;
1245 					break;
1246 				case TOMOYO_NUMBER_UNION:
1247 					numbers_p++;
1248 					break;
1249 				}
1250 			}
1251 			while (head->r.cond_index < condc) {
1252 				const u8 match = condp->equals;
1253 				const u8 left = condp->left;
1254 				const u8 right = condp->right;
1255 				if (!tomoyo_flush(head))
1256 					return false;
1257 				condp++;
1258 				head->r.cond_index++;
1259 				tomoyo_set_space(head);
1260 				switch (left) {
1261 				case TOMOYO_ARGV_ENTRY:
1262 					tomoyo_io_printf(head,
1263 							 "exec.argv[%lu]%s=\"",
1264 							 argv->index, argv->
1265 							 is_not ? "!" : "");
1266 					tomoyo_set_string(head,
1267 							  argv->value->name);
1268 					tomoyo_set_string(head, "\"");
1269 					argv++;
1270 					continue;
1271 				case TOMOYO_ENVP_ENTRY:
1272 					tomoyo_set_string(head,
1273 							  "exec.envp[\"");
1274 					tomoyo_set_string(head,
1275 							  envp->name->name);
1276 					tomoyo_io_printf(head, "\"]%s=", envp->
1277 							 is_not ? "!" : "");
1278 					if (envp->value) {
1279 						tomoyo_set_string(head, "\"");
1280 						tomoyo_set_string(head, envp->
1281 								  value->name);
1282 						tomoyo_set_string(head, "\"");
1283 					} else {
1284 						tomoyo_set_string(head,
1285 								  "NULL");
1286 					}
1287 					envp++;
1288 					continue;
1289 				case TOMOYO_NUMBER_UNION:
1290 					tomoyo_print_number_union_nospace
1291 						(head, numbers_p++);
1292 					break;
1293 				default:
1294 					tomoyo_set_string(head,
1295 					       tomoyo_condition_keyword[left]);
1296 					break;
1297 				}
1298 				tomoyo_set_string(head, match ? "=" : "!=");
1299 				switch (right) {
1300 				case TOMOYO_NAME_UNION:
1301 					tomoyo_print_name_union_quoted
1302 						(head, names_p++);
1303 					break;
1304 				case TOMOYO_NUMBER_UNION:
1305 					tomoyo_print_number_union_nospace
1306 						(head, numbers_p++);
1307 					break;
1308 				default:
1309 					tomoyo_set_string(head,
1310 					  tomoyo_condition_keyword[right]);
1311 					break;
1312 				}
1313 			}
1314 		}
1315 		head->r.cond_step++;
1316 		/* fall through */
1317 	case 2:
1318 		if (!tomoyo_flush(head))
1319 			break;
1320 		head->r.cond_step++;
1321 		/* fall through */
1322 	case 3:
1323 		if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1324 			tomoyo_io_printf(head, " grant_log=%s",
1325 					 tomoyo_yesno(cond->grant_log ==
1326 						      TOMOYO_GRANTLOG_YES));
1327 		tomoyo_set_lf(head);
1328 		return true;
1329 	}
1330 	return false;
1331 }
1332 
1333 /**
1334  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1335  *
1336  * @head:     Pointer to "struct tomoyo_io_buffer".
1337  * @category: Category name.
1338  *
1339  * Returns nothing.
1340  */
tomoyo_set_group(struct tomoyo_io_buffer * head,const char * category)1341 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1342 			     const char *category)
1343 {
1344 	if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1345 		tomoyo_print_namespace(head);
1346 		tomoyo_io_printf(head, "acl_group %u ",
1347 				 head->r.acl_group_index);
1348 	}
1349 	tomoyo_set_string(head, category);
1350 }
1351 
1352 /**
1353  * tomoyo_print_entry - Print an ACL entry.
1354  *
1355  * @head: Pointer to "struct tomoyo_io_buffer".
1356  * @acl:  Pointer to an ACL entry.
1357  *
1358  * Returns true on success, false otherwise.
1359  */
tomoyo_print_entry(struct tomoyo_io_buffer * head,struct tomoyo_acl_info * acl)1360 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1361 			       struct tomoyo_acl_info *acl)
1362 {
1363 	const u8 acl_type = acl->type;
1364 	bool first = true;
1365 	u8 bit;
1366 
1367 	if (head->r.print_cond_part)
1368 		goto print_cond_part;
1369 	if (acl->is_deleted)
1370 		return true;
1371 	if (!tomoyo_flush(head))
1372 		return false;
1373 	else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1374 		struct tomoyo_path_acl *ptr =
1375 			container_of(acl, typeof(*ptr), head);
1376 		const u16 perm = ptr->perm;
1377 		for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1378 			if (!(perm & (1 << bit)))
1379 				continue;
1380 			if (head->r.print_transition_related_only &&
1381 			    bit != TOMOYO_TYPE_EXECUTE)
1382 				continue;
1383 			if (first) {
1384 				tomoyo_set_group(head, "file ");
1385 				first = false;
1386 			} else {
1387 				tomoyo_set_slash(head);
1388 			}
1389 			tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1390 		}
1391 		if (first)
1392 			return true;
1393 		tomoyo_print_name_union(head, &ptr->name);
1394 	} else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1395 		struct tomoyo_task_acl *ptr =
1396 			container_of(acl, typeof(*ptr), head);
1397 		tomoyo_set_group(head, "task ");
1398 		tomoyo_set_string(head, "manual_domain_transition ");
1399 		tomoyo_set_string(head, ptr->domainname->name);
1400 	} else if (head->r.print_transition_related_only) {
1401 		return true;
1402 	} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1403 		struct tomoyo_path2_acl *ptr =
1404 			container_of(acl, typeof(*ptr), head);
1405 		const u8 perm = ptr->perm;
1406 		for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1407 			if (!(perm & (1 << bit)))
1408 				continue;
1409 			if (first) {
1410 				tomoyo_set_group(head, "file ");
1411 				first = false;
1412 			} else {
1413 				tomoyo_set_slash(head);
1414 			}
1415 			tomoyo_set_string(head, tomoyo_mac_keywords
1416 					  [tomoyo_pp2mac[bit]]);
1417 		}
1418 		if (first)
1419 			return true;
1420 		tomoyo_print_name_union(head, &ptr->name1);
1421 		tomoyo_print_name_union(head, &ptr->name2);
1422 	} else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1423 		struct tomoyo_path_number_acl *ptr =
1424 			container_of(acl, typeof(*ptr), head);
1425 		const u8 perm = ptr->perm;
1426 		for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1427 			if (!(perm & (1 << bit)))
1428 				continue;
1429 			if (first) {
1430 				tomoyo_set_group(head, "file ");
1431 				first = false;
1432 			} else {
1433 				tomoyo_set_slash(head);
1434 			}
1435 			tomoyo_set_string(head, tomoyo_mac_keywords
1436 					  [tomoyo_pn2mac[bit]]);
1437 		}
1438 		if (first)
1439 			return true;
1440 		tomoyo_print_name_union(head, &ptr->name);
1441 		tomoyo_print_number_union(head, &ptr->number);
1442 	} else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1443 		struct tomoyo_mkdev_acl *ptr =
1444 			container_of(acl, typeof(*ptr), head);
1445 		const u8 perm = ptr->perm;
1446 		for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1447 			if (!(perm & (1 << bit)))
1448 				continue;
1449 			if (first) {
1450 				tomoyo_set_group(head, "file ");
1451 				first = false;
1452 			} else {
1453 				tomoyo_set_slash(head);
1454 			}
1455 			tomoyo_set_string(head, tomoyo_mac_keywords
1456 					  [tomoyo_pnnn2mac[bit]]);
1457 		}
1458 		if (first)
1459 			return true;
1460 		tomoyo_print_name_union(head, &ptr->name);
1461 		tomoyo_print_number_union(head, &ptr->mode);
1462 		tomoyo_print_number_union(head, &ptr->major);
1463 		tomoyo_print_number_union(head, &ptr->minor);
1464 	} else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1465 		struct tomoyo_inet_acl *ptr =
1466 			container_of(acl, typeof(*ptr), head);
1467 		const u8 perm = ptr->perm;
1468 
1469 		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1470 			if (!(perm & (1 << bit)))
1471 				continue;
1472 			if (first) {
1473 				tomoyo_set_group(head, "network inet ");
1474 				tomoyo_set_string(head, tomoyo_proto_keyword
1475 						  [ptr->protocol]);
1476 				tomoyo_set_space(head);
1477 				first = false;
1478 			} else {
1479 				tomoyo_set_slash(head);
1480 			}
1481 			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1482 		}
1483 		if (first)
1484 			return true;
1485 		tomoyo_set_space(head);
1486 		if (ptr->address.group) {
1487 			tomoyo_set_string(head, "@");
1488 			tomoyo_set_string(head, ptr->address.group->group_name
1489 					  ->name);
1490 		} else {
1491 			char buf[128];
1492 			tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1493 			tomoyo_io_printf(head, "%s", buf);
1494 		}
1495 		tomoyo_print_number_union(head, &ptr->port);
1496 	} else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1497 		struct tomoyo_unix_acl *ptr =
1498 			container_of(acl, typeof(*ptr), head);
1499 		const u8 perm = ptr->perm;
1500 
1501 		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1502 			if (!(perm & (1 << bit)))
1503 				continue;
1504 			if (first) {
1505 				tomoyo_set_group(head, "network unix ");
1506 				tomoyo_set_string(head, tomoyo_proto_keyword
1507 						  [ptr->protocol]);
1508 				tomoyo_set_space(head);
1509 				first = false;
1510 			} else {
1511 				tomoyo_set_slash(head);
1512 			}
1513 			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1514 		}
1515 		if (first)
1516 			return true;
1517 		tomoyo_print_name_union(head, &ptr->name);
1518 	} else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1519 		struct tomoyo_mount_acl *ptr =
1520 			container_of(acl, typeof(*ptr), head);
1521 		tomoyo_set_group(head, "file mount");
1522 		tomoyo_print_name_union(head, &ptr->dev_name);
1523 		tomoyo_print_name_union(head, &ptr->dir_name);
1524 		tomoyo_print_name_union(head, &ptr->fs_type);
1525 		tomoyo_print_number_union(head, &ptr->flags);
1526 	} else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1527 		struct tomoyo_env_acl *ptr =
1528 			container_of(acl, typeof(*ptr), head);
1529 
1530 		tomoyo_set_group(head, "misc env ");
1531 		tomoyo_set_string(head, ptr->env->name);
1532 	}
1533 	if (acl->cond) {
1534 		head->r.print_cond_part = true;
1535 		head->r.cond_step = 0;
1536 		if (!tomoyo_flush(head))
1537 			return false;
1538 print_cond_part:
1539 		if (!tomoyo_print_condition(head, acl->cond))
1540 			return false;
1541 		head->r.print_cond_part = false;
1542 	} else {
1543 		tomoyo_set_lf(head);
1544 	}
1545 	return true;
1546 }
1547 
1548 /**
1549  * tomoyo_read_domain2 - Read domain policy.
1550  *
1551  * @head: Pointer to "struct tomoyo_io_buffer".
1552  * @list: Pointer to "struct list_head".
1553  *
1554  * Caller holds tomoyo_read_lock().
1555  *
1556  * Returns true on success, false otherwise.
1557  */
tomoyo_read_domain2(struct tomoyo_io_buffer * head,struct list_head * list)1558 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1559 				struct list_head *list)
1560 {
1561 	list_for_each_cookie(head->r.acl, list) {
1562 		struct tomoyo_acl_info *ptr =
1563 			list_entry(head->r.acl, typeof(*ptr), list);
1564 		if (!tomoyo_print_entry(head, ptr))
1565 			return false;
1566 	}
1567 	head->r.acl = NULL;
1568 	return true;
1569 }
1570 
1571 /**
1572  * tomoyo_read_domain - Read domain policy.
1573  *
1574  * @head: Pointer to "struct tomoyo_io_buffer".
1575  *
1576  * Caller holds tomoyo_read_lock().
1577  */
tomoyo_read_domain(struct tomoyo_io_buffer * head)1578 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1579 {
1580 	if (head->r.eof)
1581 		return;
1582 	list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1583 		struct tomoyo_domain_info *domain =
1584 			list_entry(head->r.domain, typeof(*domain), list);
1585 		switch (head->r.step) {
1586 			u8 i;
1587 		case 0:
1588 			if (domain->is_deleted &&
1589 			    !head->r.print_this_domain_only)
1590 				continue;
1591 			/* Print domainname and flags. */
1592 			tomoyo_set_string(head, domain->domainname->name);
1593 			tomoyo_set_lf(head);
1594 			tomoyo_io_printf(head, "use_profile %u\n",
1595 					 domain->profile);
1596 			tomoyo_io_printf(head, "use_group %u\n",
1597 					 domain->group);
1598 			for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1599 				if (domain->flags[i])
1600 					tomoyo_set_string(head, tomoyo_dif[i]);
1601 			head->r.step++;
1602 			tomoyo_set_lf(head);
1603 			/* fall through */
1604 		case 1:
1605 			if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1606 				return;
1607 			head->r.step++;
1608 			if (!tomoyo_set_lf(head))
1609 				return;
1610 			/* fall through */
1611 		case 2:
1612 			head->r.step = 0;
1613 			if (head->r.print_this_domain_only)
1614 				goto done;
1615 		}
1616 	}
1617  done:
1618 	head->r.eof = true;
1619 }
1620 
1621 /**
1622  * tomoyo_write_pid: Specify PID to obtain domainname.
1623  *
1624  * @head: Pointer to "struct tomoyo_io_buffer".
1625  *
1626  * Returns 0.
1627  */
tomoyo_write_pid(struct tomoyo_io_buffer * head)1628 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1629 {
1630 	head->r.eof = false;
1631 	return 0;
1632 }
1633 
1634 /**
1635  * tomoyo_read_pid - Get domainname of the specified PID.
1636  *
1637  * @head: Pointer to "struct tomoyo_io_buffer".
1638  *
1639  * Returns the domainname which the specified PID is in on success,
1640  * empty string otherwise.
1641  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1642  * using read()/write() interface rather than sysctl() interface.
1643  */
tomoyo_read_pid(struct tomoyo_io_buffer * head)1644 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1645 {
1646 	char *buf = head->write_buf;
1647 	bool global_pid = false;
1648 	unsigned int pid;
1649 	struct task_struct *p;
1650 	struct tomoyo_domain_info *domain = NULL;
1651 
1652 	/* Accessing write_buf is safe because head->io_sem is held. */
1653 	if (!buf) {
1654 		head->r.eof = true;
1655 		return; /* Do nothing if open(O_RDONLY). */
1656 	}
1657 	if (head->r.w_pos || head->r.eof)
1658 		return;
1659 	head->r.eof = true;
1660 	if (tomoyo_str_starts(&buf, "global-pid "))
1661 		global_pid = true;
1662 	pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1663 	rcu_read_lock();
1664 	if (global_pid)
1665 		p = find_task_by_pid_ns(pid, &init_pid_ns);
1666 	else
1667 		p = find_task_by_vpid(pid);
1668 	if (p)
1669 		domain = tomoyo_real_domain(p);
1670 	rcu_read_unlock();
1671 	if (!domain)
1672 		return;
1673 	tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1674 	tomoyo_set_string(head, domain->domainname->name);
1675 }
1676 
1677 /* String table for domain transition control keywords. */
1678 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1679 	[TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1680 	[TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1681 	[TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1682 	[TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1683 	[TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1684 	[TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1685 };
1686 
1687 /* String table for grouping keywords. */
1688 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1689 	[TOMOYO_PATH_GROUP]    = "path_group ",
1690 	[TOMOYO_NUMBER_GROUP]  = "number_group ",
1691 	[TOMOYO_ADDRESS_GROUP] = "address_group ",
1692 };
1693 
1694 /**
1695  * tomoyo_write_exception - Write exception policy.
1696  *
1697  * @head: Pointer to "struct tomoyo_io_buffer".
1698  *
1699  * Returns 0 on success, negative value otherwise.
1700  *
1701  * Caller holds tomoyo_read_lock().
1702  */
tomoyo_write_exception(struct tomoyo_io_buffer * head)1703 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1704 {
1705 	const bool is_delete = head->w.is_delete;
1706 	struct tomoyo_acl_param param = {
1707 		.ns = head->w.ns,
1708 		.is_delete = is_delete,
1709 		.data = head->write_buf,
1710 	};
1711 	u8 i;
1712 	if (tomoyo_str_starts(&param.data, "aggregator "))
1713 		return tomoyo_write_aggregator(&param);
1714 	for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1715 		if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1716 			return tomoyo_write_transition_control(&param, i);
1717 	for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1718 		if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1719 			return tomoyo_write_group(&param, i);
1720 	if (tomoyo_str_starts(&param.data, "acl_group ")) {
1721 		unsigned int group;
1722 		char *data;
1723 		group = simple_strtoul(param.data, &data, 10);
1724 		if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1725 			return tomoyo_write_domain2
1726 				(head->w.ns, &head->w.ns->acl_group[group],
1727 				 data, is_delete);
1728 	}
1729 	return -EINVAL;
1730 }
1731 
1732 /**
1733  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1734  *
1735  * @head: Pointer to "struct tomoyo_io_buffer".
1736  * @idx:  Index number.
1737  *
1738  * Returns true on success, false otherwise.
1739  *
1740  * Caller holds tomoyo_read_lock().
1741  */
tomoyo_read_group(struct tomoyo_io_buffer * head,const int idx)1742 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1743 {
1744 	struct tomoyo_policy_namespace *ns =
1745 		container_of(head->r.ns, typeof(*ns), namespace_list);
1746 	struct list_head *list = &ns->group_list[idx];
1747 	list_for_each_cookie(head->r.group, list) {
1748 		struct tomoyo_group *group =
1749 			list_entry(head->r.group, typeof(*group), head.list);
1750 		list_for_each_cookie(head->r.acl, &group->member_list) {
1751 			struct tomoyo_acl_head *ptr =
1752 				list_entry(head->r.acl, typeof(*ptr), list);
1753 			if (ptr->is_deleted)
1754 				continue;
1755 			if (!tomoyo_flush(head))
1756 				return false;
1757 			tomoyo_print_namespace(head);
1758 			tomoyo_set_string(head, tomoyo_group_name[idx]);
1759 			tomoyo_set_string(head, group->group_name->name);
1760 			if (idx == TOMOYO_PATH_GROUP) {
1761 				tomoyo_set_space(head);
1762 				tomoyo_set_string(head, container_of
1763 					       (ptr, struct tomoyo_path_group,
1764 						head)->member_name->name);
1765 			} else if (idx == TOMOYO_NUMBER_GROUP) {
1766 				tomoyo_print_number_union(head, &container_of
1767 							  (ptr,
1768 						   struct tomoyo_number_group,
1769 							   head)->number);
1770 			} else if (idx == TOMOYO_ADDRESS_GROUP) {
1771 				char buffer[128];
1772 
1773 				struct tomoyo_address_group *member =
1774 					container_of(ptr, typeof(*member),
1775 						     head);
1776 				tomoyo_print_ip(buffer, sizeof(buffer),
1777 						&member->address);
1778 				tomoyo_io_printf(head, " %s", buffer);
1779 			}
1780 			tomoyo_set_lf(head);
1781 		}
1782 		head->r.acl = NULL;
1783 	}
1784 	head->r.group = NULL;
1785 	return true;
1786 }
1787 
1788 /**
1789  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1790  *
1791  * @head: Pointer to "struct tomoyo_io_buffer".
1792  * @idx:  Index number.
1793  *
1794  * Returns true on success, false otherwise.
1795  *
1796  * Caller holds tomoyo_read_lock().
1797  */
tomoyo_read_policy(struct tomoyo_io_buffer * head,const int idx)1798 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1799 {
1800 	struct tomoyo_policy_namespace *ns =
1801 		container_of(head->r.ns, typeof(*ns), namespace_list);
1802 	struct list_head *list = &ns->policy_list[idx];
1803 	list_for_each_cookie(head->r.acl, list) {
1804 		struct tomoyo_acl_head *acl =
1805 			container_of(head->r.acl, typeof(*acl), list);
1806 		if (acl->is_deleted)
1807 			continue;
1808 		if (!tomoyo_flush(head))
1809 			return false;
1810 		switch (idx) {
1811 		case TOMOYO_ID_TRANSITION_CONTROL:
1812 			{
1813 				struct tomoyo_transition_control *ptr =
1814 					container_of(acl, typeof(*ptr), head);
1815 				tomoyo_print_namespace(head);
1816 				tomoyo_set_string(head, tomoyo_transition_type
1817 						  [ptr->type]);
1818 				tomoyo_set_string(head, ptr->program ?
1819 						  ptr->program->name : "any");
1820 				tomoyo_set_string(head, " from ");
1821 				tomoyo_set_string(head, ptr->domainname ?
1822 						  ptr->domainname->name :
1823 						  "any");
1824 			}
1825 			break;
1826 		case TOMOYO_ID_AGGREGATOR:
1827 			{
1828 				struct tomoyo_aggregator *ptr =
1829 					container_of(acl, typeof(*ptr), head);
1830 				tomoyo_print_namespace(head);
1831 				tomoyo_set_string(head, "aggregator ");
1832 				tomoyo_set_string(head,
1833 						  ptr->original_name->name);
1834 				tomoyo_set_space(head);
1835 				tomoyo_set_string(head,
1836 					       ptr->aggregated_name->name);
1837 			}
1838 			break;
1839 		default:
1840 			continue;
1841 		}
1842 		tomoyo_set_lf(head);
1843 	}
1844 	head->r.acl = NULL;
1845 	return true;
1846 }
1847 
1848 /**
1849  * tomoyo_read_exception - Read exception policy.
1850  *
1851  * @head: Pointer to "struct tomoyo_io_buffer".
1852  *
1853  * Caller holds tomoyo_read_lock().
1854  */
tomoyo_read_exception(struct tomoyo_io_buffer * head)1855 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1856 {
1857 	struct tomoyo_policy_namespace *ns =
1858 		container_of(head->r.ns, typeof(*ns), namespace_list);
1859 	if (head->r.eof)
1860 		return;
1861 	while (head->r.step < TOMOYO_MAX_POLICY &&
1862 	       tomoyo_read_policy(head, head->r.step))
1863 		head->r.step++;
1864 	if (head->r.step < TOMOYO_MAX_POLICY)
1865 		return;
1866 	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1867 	       tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1868 		head->r.step++;
1869 	if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1870 		return;
1871 	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1872 	       + TOMOYO_MAX_ACL_GROUPS) {
1873 		head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1874 			- TOMOYO_MAX_GROUP;
1875 		if (!tomoyo_read_domain2(head, &ns->acl_group
1876 					 [head->r.acl_group_index]))
1877 			return;
1878 		head->r.step++;
1879 	}
1880 	head->r.eof = true;
1881 }
1882 
1883 /* Wait queue for kernel -> userspace notification. */
1884 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1885 /* Wait queue for userspace -> kernel notification. */
1886 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1887 
1888 /* Structure for query. */
1889 struct tomoyo_query {
1890 	struct list_head list;
1891 	struct tomoyo_domain_info *domain;
1892 	char *query;
1893 	size_t query_len;
1894 	unsigned int serial;
1895 	u8 timer;
1896 	u8 answer;
1897 	u8 retry;
1898 };
1899 
1900 /* The list for "struct tomoyo_query". */
1901 static LIST_HEAD(tomoyo_query_list);
1902 
1903 /* Lock for manipulating tomoyo_query_list. */
1904 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1905 
1906 /*
1907  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1908  * interface.
1909  */
1910 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1911 
1912 /**
1913  * tomoyo_truncate - Truncate a line.
1914  *
1915  * @str: String to truncate.
1916  *
1917  * Returns length of truncated @str.
1918  */
tomoyo_truncate(char * str)1919 static int tomoyo_truncate(char *str)
1920 {
1921 	char *start = str;
1922 	while (*(unsigned char *) str > (unsigned char) ' ')
1923 		str++;
1924 	*str = '\0';
1925 	return strlen(start) + 1;
1926 }
1927 
1928 /**
1929  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1930  *
1931  * @domain: Pointer to "struct tomoyo_domain_info".
1932  * @header: Lines containing ACL.
1933  *
1934  * Returns nothing.
1935  */
tomoyo_add_entry(struct tomoyo_domain_info * domain,char * header)1936 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1937 {
1938 	char *buffer;
1939 	char *realpath = NULL;
1940 	char *argv0 = NULL;
1941 	char *symlink = NULL;
1942 	char *cp = strchr(header, '\n');
1943 	int len;
1944 	if (!cp)
1945 		return;
1946 	cp = strchr(cp + 1, '\n');
1947 	if (!cp)
1948 		return;
1949 	*cp++ = '\0';
1950 	len = strlen(cp) + 1;
1951 	/* strstr() will return NULL if ordering is wrong. */
1952 	if (*cp == 'f') {
1953 		argv0 = strstr(header, " argv[]={ \"");
1954 		if (argv0) {
1955 			argv0 += 10;
1956 			len += tomoyo_truncate(argv0) + 14;
1957 		}
1958 		realpath = strstr(header, " exec={ realpath=\"");
1959 		if (realpath) {
1960 			realpath += 8;
1961 			len += tomoyo_truncate(realpath) + 6;
1962 		}
1963 		symlink = strstr(header, " symlink.target=\"");
1964 		if (symlink)
1965 			len += tomoyo_truncate(symlink + 1) + 1;
1966 	}
1967 	buffer = kmalloc(len, GFP_NOFS);
1968 	if (!buffer)
1969 		return;
1970 	snprintf(buffer, len - 1, "%s", cp);
1971 	if (realpath)
1972 		tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1973 	if (argv0)
1974 		tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1975 	if (symlink)
1976 		tomoyo_addprintf(buffer, len, "%s", symlink);
1977 	tomoyo_normalize_line(buffer);
1978 	if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1979 				  false))
1980 		tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1981 	kfree(buffer);
1982 }
1983 
1984 /**
1985  * tomoyo_supervisor - Ask for the supervisor's decision.
1986  *
1987  * @r:   Pointer to "struct tomoyo_request_info".
1988  * @fmt: The printf()'s format string, followed by parameters.
1989  *
1990  * Returns 0 if the supervisor decided to permit the access request which
1991  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1992  * supervisor decided to retry the access request which violated the policy in
1993  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1994  */
tomoyo_supervisor(struct tomoyo_request_info * r,const char * fmt,...)1995 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1996 {
1997 	va_list args;
1998 	int error;
1999 	int len;
2000 	static unsigned int tomoyo_serial;
2001 	struct tomoyo_query entry = { };
2002 	bool quota_exceeded = false;
2003 	va_start(args, fmt);
2004 	len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2005 	va_end(args);
2006 	/* Write /sys/kernel/security/tomoyo/audit. */
2007 	va_start(args, fmt);
2008 	tomoyo_write_log2(r, len, fmt, args);
2009 	va_end(args);
2010 	/* Nothing more to do if granted. */
2011 	if (r->granted)
2012 		return 0;
2013 	if (r->mode)
2014 		tomoyo_update_stat(r->mode);
2015 	switch (r->mode) {
2016 	case TOMOYO_CONFIG_ENFORCING:
2017 		error = -EPERM;
2018 		if (atomic_read(&tomoyo_query_observers))
2019 			break;
2020 		goto out;
2021 	case TOMOYO_CONFIG_LEARNING:
2022 		error = 0;
2023 		/* Check max_learning_entry parameter. */
2024 		if (tomoyo_domain_quota_is_ok(r))
2025 			break;
2026 		/* fall through */
2027 	default:
2028 		return 0;
2029 	}
2030 	/* Get message. */
2031 	va_start(args, fmt);
2032 	entry.query = tomoyo_init_log(r, len, fmt, args);
2033 	va_end(args);
2034 	if (!entry.query)
2035 		goto out;
2036 	entry.query_len = strlen(entry.query) + 1;
2037 	if (!error) {
2038 		tomoyo_add_entry(r->domain, entry.query);
2039 		goto out;
2040 	}
2041 	len = tomoyo_round2(entry.query_len);
2042 	entry.domain = r->domain;
2043 	spin_lock(&tomoyo_query_list_lock);
2044 	if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2045 	    tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2046 	    >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2047 		quota_exceeded = true;
2048 	} else {
2049 		entry.serial = tomoyo_serial++;
2050 		entry.retry = r->retry;
2051 		tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2052 		list_add_tail(&entry.list, &tomoyo_query_list);
2053 	}
2054 	spin_unlock(&tomoyo_query_list_lock);
2055 	if (quota_exceeded)
2056 		goto out;
2057 	/* Give 10 seconds for supervisor's opinion. */
2058 	while (entry.timer < 10) {
2059 		wake_up_all(&tomoyo_query_wait);
2060 		if (wait_event_interruptible_timeout
2061 		    (tomoyo_answer_wait, entry.answer ||
2062 		     !atomic_read(&tomoyo_query_observers), HZ))
2063 			break;
2064 		else
2065 			entry.timer++;
2066 	}
2067 	spin_lock(&tomoyo_query_list_lock);
2068 	list_del(&entry.list);
2069 	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2070 	spin_unlock(&tomoyo_query_list_lock);
2071 	switch (entry.answer) {
2072 	case 3: /* Asked to retry by administrator. */
2073 		error = TOMOYO_RETRY_REQUEST;
2074 		r->retry++;
2075 		break;
2076 	case 1:
2077 		/* Granted by administrator. */
2078 		error = 0;
2079 		break;
2080 	default:
2081 		/* Timed out or rejected by administrator. */
2082 		break;
2083 	}
2084 out:
2085 	kfree(entry.query);
2086 	return error;
2087 }
2088 
2089 /**
2090  * tomoyo_find_domain_by_qid - Get domain by query id.
2091  *
2092  * @serial: Query ID assigned by tomoyo_supervisor().
2093  *
2094  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2095  */
tomoyo_find_domain_by_qid(unsigned int serial)2096 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2097 (unsigned int serial)
2098 {
2099 	struct tomoyo_query *ptr;
2100 	struct tomoyo_domain_info *domain = NULL;
2101 	spin_lock(&tomoyo_query_list_lock);
2102 	list_for_each_entry(ptr, &tomoyo_query_list, list) {
2103 		if (ptr->serial != serial)
2104 			continue;
2105 		domain = ptr->domain;
2106 		break;
2107 	}
2108 	spin_unlock(&tomoyo_query_list_lock);
2109 	return domain;
2110 }
2111 
2112 /**
2113  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2114  *
2115  * @file: Pointer to "struct file".
2116  * @wait: Pointer to "poll_table".
2117  *
2118  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2119  *
2120  * Waits for access requests which violated policy in enforcing mode.
2121  */
tomoyo_poll_query(struct file * file,poll_table * wait)2122 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2123 {
2124 	if (!list_empty(&tomoyo_query_list))
2125 		return POLLIN | POLLRDNORM;
2126 	poll_wait(file, &tomoyo_query_wait, wait);
2127 	if (!list_empty(&tomoyo_query_list))
2128 		return POLLIN | POLLRDNORM;
2129 	return 0;
2130 }
2131 
2132 /**
2133  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2134  *
2135  * @head: Pointer to "struct tomoyo_io_buffer".
2136  */
tomoyo_read_query(struct tomoyo_io_buffer * head)2137 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2138 {
2139 	struct list_head *tmp;
2140 	unsigned int pos = 0;
2141 	size_t len = 0;
2142 	char *buf;
2143 	if (head->r.w_pos)
2144 		return;
2145 	if (head->read_buf) {
2146 		kfree(head->read_buf);
2147 		head->read_buf = NULL;
2148 	}
2149 	spin_lock(&tomoyo_query_list_lock);
2150 	list_for_each(tmp, &tomoyo_query_list) {
2151 		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2152 		if (pos++ != head->r.query_index)
2153 			continue;
2154 		len = ptr->query_len;
2155 		break;
2156 	}
2157 	spin_unlock(&tomoyo_query_list_lock);
2158 	if (!len) {
2159 		head->r.query_index = 0;
2160 		return;
2161 	}
2162 	buf = kzalloc(len + 32, GFP_NOFS);
2163 	if (!buf)
2164 		return;
2165 	pos = 0;
2166 	spin_lock(&tomoyo_query_list_lock);
2167 	list_for_each(tmp, &tomoyo_query_list) {
2168 		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2169 		if (pos++ != head->r.query_index)
2170 			continue;
2171 		/*
2172 		 * Some query can be skipped because tomoyo_query_list
2173 		 * can change, but I don't care.
2174 		 */
2175 		if (len == ptr->query_len)
2176 			snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2177 				 ptr->retry, ptr->query);
2178 		break;
2179 	}
2180 	spin_unlock(&tomoyo_query_list_lock);
2181 	if (buf[0]) {
2182 		head->read_buf = buf;
2183 		head->r.w[head->r.w_pos++] = buf;
2184 		head->r.query_index++;
2185 	} else {
2186 		kfree(buf);
2187 	}
2188 }
2189 
2190 /**
2191  * tomoyo_write_answer - Write the supervisor's decision.
2192  *
2193  * @head: Pointer to "struct tomoyo_io_buffer".
2194  *
2195  * Returns 0 on success, -EINVAL otherwise.
2196  */
tomoyo_write_answer(struct tomoyo_io_buffer * head)2197 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2198 {
2199 	char *data = head->write_buf;
2200 	struct list_head *tmp;
2201 	unsigned int serial;
2202 	unsigned int answer;
2203 	spin_lock(&tomoyo_query_list_lock);
2204 	list_for_each(tmp, &tomoyo_query_list) {
2205 		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2206 		ptr->timer = 0;
2207 	}
2208 	spin_unlock(&tomoyo_query_list_lock);
2209 	if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2210 		return -EINVAL;
2211 	spin_lock(&tomoyo_query_list_lock);
2212 	list_for_each(tmp, &tomoyo_query_list) {
2213 		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2214 		if (ptr->serial != serial)
2215 			continue;
2216 		ptr->answer = answer;
2217 		/* Remove from tomoyo_query_list. */
2218 		if (ptr->answer)
2219 			list_del_init(&ptr->list);
2220 		break;
2221 	}
2222 	spin_unlock(&tomoyo_query_list_lock);
2223 	return 0;
2224 }
2225 
2226 /**
2227  * tomoyo_read_version: Get version.
2228  *
2229  * @head: Pointer to "struct tomoyo_io_buffer".
2230  *
2231  * Returns version information.
2232  */
tomoyo_read_version(struct tomoyo_io_buffer * head)2233 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2234 {
2235 	if (!head->r.eof) {
2236 		tomoyo_io_printf(head, "2.5.0");
2237 		head->r.eof = true;
2238 	}
2239 }
2240 
2241 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2242 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2243 	[TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2244 	[TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2245 	[TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2246 	[TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2247 };
2248 
2249 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2250 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2251 	[TOMOYO_MEMORY_POLICY] = "policy:",
2252 	[TOMOYO_MEMORY_AUDIT]  = "audit log:",
2253 	[TOMOYO_MEMORY_QUERY]  = "query message:",
2254 };
2255 
2256 /* Timestamp counter for last updated. */
2257 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2258 /* Counter for number of updates. */
2259 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2260 
2261 /**
2262  * tomoyo_update_stat - Update statistic counters.
2263  *
2264  * @index: Index for policy type.
2265  *
2266  * Returns nothing.
2267  */
tomoyo_update_stat(const u8 index)2268 void tomoyo_update_stat(const u8 index)
2269 {
2270 	struct timeval tv;
2271 	do_gettimeofday(&tv);
2272 	/*
2273 	 * I don't use atomic operations because race condition is not fatal.
2274 	 */
2275 	tomoyo_stat_updated[index]++;
2276 	tomoyo_stat_modified[index] = tv.tv_sec;
2277 }
2278 
2279 /**
2280  * tomoyo_read_stat - Read statistic data.
2281  *
2282  * @head: Pointer to "struct tomoyo_io_buffer".
2283  *
2284  * Returns nothing.
2285  */
tomoyo_read_stat(struct tomoyo_io_buffer * head)2286 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2287 {
2288 	u8 i;
2289 	unsigned int total = 0;
2290 	if (head->r.eof)
2291 		return;
2292 	for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2293 		tomoyo_io_printf(head, "Policy %-30s %10u",
2294 				 tomoyo_policy_headers[i],
2295 				 tomoyo_stat_updated[i]);
2296 		if (tomoyo_stat_modified[i]) {
2297 			struct tomoyo_time stamp;
2298 			tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2299 			tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2300 					 "%02u:%02u:%02u)",
2301 					 stamp.year, stamp.month, stamp.day,
2302 					 stamp.hour, stamp.min, stamp.sec);
2303 		}
2304 		tomoyo_set_lf(head);
2305 	}
2306 	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2307 		unsigned int used = tomoyo_memory_used[i];
2308 		total += used;
2309 		tomoyo_io_printf(head, "Memory used by %-22s %10u",
2310 				 tomoyo_memory_headers[i], used);
2311 		used = tomoyo_memory_quota[i];
2312 		if (used)
2313 			tomoyo_io_printf(head, " (Quota: %10u)", used);
2314 		tomoyo_set_lf(head);
2315 	}
2316 	tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2317 			 total);
2318 	head->r.eof = true;
2319 }
2320 
2321 /**
2322  * tomoyo_write_stat - Set memory quota.
2323  *
2324  * @head: Pointer to "struct tomoyo_io_buffer".
2325  *
2326  * Returns 0.
2327  */
tomoyo_write_stat(struct tomoyo_io_buffer * head)2328 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2329 {
2330 	char *data = head->write_buf;
2331 	u8 i;
2332 	if (tomoyo_str_starts(&data, "Memory used by "))
2333 		for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2334 			if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2335 				sscanf(data, "%u", &tomoyo_memory_quota[i]);
2336 	return 0;
2337 }
2338 
2339 /**
2340  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2341  *
2342  * @type: Type of interface.
2343  * @file: Pointer to "struct file".
2344  *
2345  * Returns 0 on success, negative value otherwise.
2346  */
tomoyo_open_control(const u8 type,struct file * file)2347 int tomoyo_open_control(const u8 type, struct file *file)
2348 {
2349 	struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2350 
2351 	if (!head)
2352 		return -ENOMEM;
2353 	mutex_init(&head->io_sem);
2354 	head->type = type;
2355 	switch (type) {
2356 	case TOMOYO_DOMAINPOLICY:
2357 		/* /sys/kernel/security/tomoyo/domain_policy */
2358 		head->write = tomoyo_write_domain;
2359 		head->read = tomoyo_read_domain;
2360 		break;
2361 	case TOMOYO_EXCEPTIONPOLICY:
2362 		/* /sys/kernel/security/tomoyo/exception_policy */
2363 		head->write = tomoyo_write_exception;
2364 		head->read = tomoyo_read_exception;
2365 		break;
2366 	case TOMOYO_AUDIT:
2367 		/* /sys/kernel/security/tomoyo/audit */
2368 		head->poll = tomoyo_poll_log;
2369 		head->read = tomoyo_read_log;
2370 		break;
2371 	case TOMOYO_PROCESS_STATUS:
2372 		/* /sys/kernel/security/tomoyo/.process_status */
2373 		head->write = tomoyo_write_pid;
2374 		head->read = tomoyo_read_pid;
2375 		break;
2376 	case TOMOYO_VERSION:
2377 		/* /sys/kernel/security/tomoyo/version */
2378 		head->read = tomoyo_read_version;
2379 		head->readbuf_size = 128;
2380 		break;
2381 	case TOMOYO_STAT:
2382 		/* /sys/kernel/security/tomoyo/stat */
2383 		head->write = tomoyo_write_stat;
2384 		head->read = tomoyo_read_stat;
2385 		head->readbuf_size = 1024;
2386 		break;
2387 	case TOMOYO_PROFILE:
2388 		/* /sys/kernel/security/tomoyo/profile */
2389 		head->write = tomoyo_write_profile;
2390 		head->read = tomoyo_read_profile;
2391 		break;
2392 	case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2393 		head->poll = tomoyo_poll_query;
2394 		head->write = tomoyo_write_answer;
2395 		head->read = tomoyo_read_query;
2396 		break;
2397 	case TOMOYO_MANAGER:
2398 		/* /sys/kernel/security/tomoyo/manager */
2399 		head->write = tomoyo_write_manager;
2400 		head->read = tomoyo_read_manager;
2401 		break;
2402 	}
2403 	if (!(file->f_mode & FMODE_READ)) {
2404 		/*
2405 		 * No need to allocate read_buf since it is not opened
2406 		 * for reading.
2407 		 */
2408 		head->read = NULL;
2409 		head->poll = NULL;
2410 	} else if (!head->poll) {
2411 		/* Don't allocate read_buf for poll() access. */
2412 		if (!head->readbuf_size)
2413 			head->readbuf_size = 4096 * 2;
2414 		head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2415 		if (!head->read_buf) {
2416 			kfree(head);
2417 			return -ENOMEM;
2418 		}
2419 	}
2420 	if (!(file->f_mode & FMODE_WRITE)) {
2421 		/*
2422 		 * No need to allocate write_buf since it is not opened
2423 		 * for writing.
2424 		 */
2425 		head->write = NULL;
2426 	} else if (head->write) {
2427 		head->writebuf_size = 4096 * 2;
2428 		head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2429 		if (!head->write_buf) {
2430 			kfree(head->read_buf);
2431 			kfree(head);
2432 			return -ENOMEM;
2433 		}
2434 	}
2435 	/*
2436 	 * If the file is /sys/kernel/security/tomoyo/query , increment the
2437 	 * observer counter.
2438 	 * The obserber counter is used by tomoyo_supervisor() to see if
2439 	 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2440 	 */
2441 	if (type == TOMOYO_QUERY)
2442 		atomic_inc(&tomoyo_query_observers);
2443 	file->private_data = head;
2444 	tomoyo_notify_gc(head, true);
2445 	return 0;
2446 }
2447 
2448 /**
2449  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2450  *
2451  * @file: Pointer to "struct file".
2452  * @wait: Pointer to "poll_table". Maybe NULL.
2453  *
2454  * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2455  * POLLOUT | POLLWRNORM otherwise.
2456  */
tomoyo_poll_control(struct file * file,poll_table * wait)2457 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2458 {
2459 	struct tomoyo_io_buffer *head = file->private_data;
2460 	if (head->poll)
2461 		return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2462 	return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2463 }
2464 
2465 /**
2466  * tomoyo_set_namespace_cursor - Set namespace to read.
2467  *
2468  * @head: Pointer to "struct tomoyo_io_buffer".
2469  *
2470  * Returns nothing.
2471  */
tomoyo_set_namespace_cursor(struct tomoyo_io_buffer * head)2472 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2473 {
2474 	struct list_head *ns;
2475 	if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2476 	    head->type != TOMOYO_PROFILE)
2477 		return;
2478 	/*
2479 	 * If this is the first read, or reading previous namespace finished
2480 	 * and has more namespaces to read, update the namespace cursor.
2481 	 */
2482 	ns = head->r.ns;
2483 	if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2484 		/* Clearing is OK because tomoyo_flush() returned true. */
2485 		memset(&head->r, 0, sizeof(head->r));
2486 		head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2487 	}
2488 }
2489 
2490 /**
2491  * tomoyo_has_more_namespace - Check for unread namespaces.
2492  *
2493  * @head: Pointer to "struct tomoyo_io_buffer".
2494  *
2495  * Returns true if we have more entries to print, false otherwise.
2496  */
tomoyo_has_more_namespace(struct tomoyo_io_buffer * head)2497 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2498 {
2499 	return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2500 		head->type == TOMOYO_PROFILE) && head->r.eof &&
2501 		head->r.ns->next != &tomoyo_namespace_list;
2502 }
2503 
2504 /**
2505  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2506  *
2507  * @head:       Pointer to "struct tomoyo_io_buffer".
2508  * @buffer:     Poiner to buffer to write to.
2509  * @buffer_len: Size of @buffer.
2510  *
2511  * Returns bytes read on success, negative value otherwise.
2512  */
tomoyo_read_control(struct tomoyo_io_buffer * head,char __user * buffer,const int buffer_len)2513 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2514 			    const int buffer_len)
2515 {
2516 	int len;
2517 	int idx;
2518 
2519 	if (!head->read)
2520 		return -ENOSYS;
2521 	if (mutex_lock_interruptible(&head->io_sem))
2522 		return -EINTR;
2523 	head->read_user_buf = buffer;
2524 	head->read_user_buf_avail = buffer_len;
2525 	idx = tomoyo_read_lock();
2526 	if (tomoyo_flush(head))
2527 		/* Call the policy handler. */
2528 		do {
2529 			tomoyo_set_namespace_cursor(head);
2530 			head->read(head);
2531 		} while (tomoyo_flush(head) &&
2532 			 tomoyo_has_more_namespace(head));
2533 	tomoyo_read_unlock(idx);
2534 	len = head->read_user_buf - buffer;
2535 	mutex_unlock(&head->io_sem);
2536 	return len;
2537 }
2538 
2539 /**
2540  * tomoyo_parse_policy - Parse a policy line.
2541  *
2542  * @head: Poiter to "struct tomoyo_io_buffer".
2543  * @line: Line to parse.
2544  *
2545  * Returns 0 on success, negative value otherwise.
2546  *
2547  * Caller holds tomoyo_read_lock().
2548  */
tomoyo_parse_policy(struct tomoyo_io_buffer * head,char * line)2549 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2550 {
2551 	/* Delete request? */
2552 	head->w.is_delete = !strncmp(line, "delete ", 7);
2553 	if (head->w.is_delete)
2554 		memmove(line, line + 7, strlen(line + 7) + 1);
2555 	/* Selecting namespace to update. */
2556 	if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2557 	    head->type == TOMOYO_PROFILE) {
2558 		if (*line == '<') {
2559 			char *cp = strchr(line, ' ');
2560 			if (cp) {
2561 				*cp++ = '\0';
2562 				head->w.ns = tomoyo_assign_namespace(line);
2563 				memmove(line, cp, strlen(cp) + 1);
2564 			} else
2565 				head->w.ns = NULL;
2566 		} else
2567 			head->w.ns = &tomoyo_kernel_namespace;
2568 		/* Don't allow updating if namespace is invalid. */
2569 		if (!head->w.ns)
2570 			return -ENOENT;
2571 	}
2572 	/* Do the update. */
2573 	return head->write(head);
2574 }
2575 
2576 /**
2577  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2578  *
2579  * @head:       Pointer to "struct tomoyo_io_buffer".
2580  * @buffer:     Pointer to buffer to read from.
2581  * @buffer_len: Size of @buffer.
2582  *
2583  * Returns @buffer_len on success, negative value otherwise.
2584  */
tomoyo_write_control(struct tomoyo_io_buffer * head,const char __user * buffer,const int buffer_len)2585 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2586 			     const char __user *buffer, const int buffer_len)
2587 {
2588 	int error = buffer_len;
2589 	size_t avail_len = buffer_len;
2590 	char *cp0 = head->write_buf;
2591 	int idx;
2592 	if (!head->write)
2593 		return -ENOSYS;
2594 	if (!access_ok(VERIFY_READ, buffer, buffer_len))
2595 		return -EFAULT;
2596 	if (mutex_lock_interruptible(&head->io_sem))
2597 		return -EINTR;
2598 	head->read_user_buf_avail = 0;
2599 	idx = tomoyo_read_lock();
2600 	/* Read a line and dispatch it to the policy handler. */
2601 	while (avail_len > 0) {
2602 		char c;
2603 		if (head->w.avail >= head->writebuf_size - 1) {
2604 			const int len = head->writebuf_size * 2;
2605 			char *cp = kzalloc(len, GFP_NOFS);
2606 			if (!cp) {
2607 				error = -ENOMEM;
2608 				break;
2609 			}
2610 			memmove(cp, cp0, head->w.avail);
2611 			kfree(cp0);
2612 			head->write_buf = cp;
2613 			cp0 = cp;
2614 			head->writebuf_size = len;
2615 		}
2616 		if (get_user(c, buffer)) {
2617 			error = -EFAULT;
2618 			break;
2619 		}
2620 		buffer++;
2621 		avail_len--;
2622 		cp0[head->w.avail++] = c;
2623 		if (c != '\n')
2624 			continue;
2625 		cp0[head->w.avail - 1] = '\0';
2626 		head->w.avail = 0;
2627 		tomoyo_normalize_line(cp0);
2628 		if (!strcmp(cp0, "reset")) {
2629 			head->w.ns = &tomoyo_kernel_namespace;
2630 			head->w.domain = NULL;
2631 			memset(&head->r, 0, sizeof(head->r));
2632 			continue;
2633 		}
2634 		/* Don't allow updating policies by non manager programs. */
2635 		switch (head->type) {
2636 		case TOMOYO_PROCESS_STATUS:
2637 			/* This does not write anything. */
2638 			break;
2639 		case TOMOYO_DOMAINPOLICY:
2640 			if (tomoyo_select_domain(head, cp0))
2641 				continue;
2642 			/* fall through */
2643 		case TOMOYO_EXCEPTIONPOLICY:
2644 			if (!strcmp(cp0, "select transition_only")) {
2645 				head->r.print_transition_related_only = true;
2646 				continue;
2647 			}
2648 			/* fall through */
2649 		default:
2650 			if (!tomoyo_manager()) {
2651 				error = -EPERM;
2652 				goto out;
2653 			}
2654 		}
2655 		switch (tomoyo_parse_policy(head, cp0)) {
2656 		case -EPERM:
2657 			error = -EPERM;
2658 			goto out;
2659 		case 0:
2660 			switch (head->type) {
2661 			case TOMOYO_DOMAINPOLICY:
2662 			case TOMOYO_EXCEPTIONPOLICY:
2663 			case TOMOYO_STAT:
2664 			case TOMOYO_PROFILE:
2665 			case TOMOYO_MANAGER:
2666 				tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2667 				break;
2668 			default:
2669 				break;
2670 			}
2671 			break;
2672 		}
2673 	}
2674 out:
2675 	tomoyo_read_unlock(idx);
2676 	mutex_unlock(&head->io_sem);
2677 	return error;
2678 }
2679 
2680 /**
2681  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2682  *
2683  * @head: Pointer to "struct tomoyo_io_buffer".
2684  */
tomoyo_close_control(struct tomoyo_io_buffer * head)2685 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2686 {
2687 	/*
2688 	 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2689 	 * observer counter.
2690 	 */
2691 	if (head->type == TOMOYO_QUERY &&
2692 	    atomic_dec_and_test(&tomoyo_query_observers))
2693 		wake_up_all(&tomoyo_answer_wait);
2694 	tomoyo_notify_gc(head, false);
2695 }
2696 
2697 /**
2698  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2699  */
tomoyo_check_profile(void)2700 void tomoyo_check_profile(void)
2701 {
2702 	struct tomoyo_domain_info *domain;
2703 	const int idx = tomoyo_read_lock();
2704 	tomoyo_policy_loaded = true;
2705 	printk(KERN_INFO "TOMOYO: 2.5.0\n");
2706 	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2707 		const u8 profile = domain->profile;
2708 		const struct tomoyo_policy_namespace *ns = domain->ns;
2709 		if (ns->profile_version != 20110903)
2710 			printk(KERN_ERR
2711 			       "Profile version %u is not supported.\n",
2712 			       ns->profile_version);
2713 		else if (!ns->profile_ptr[profile])
2714 			printk(KERN_ERR
2715 			       "Profile %u (used by '%s') is not defined.\n",
2716 			       profile, domain->domainname->name);
2717 		else
2718 			continue;
2719 		printk(KERN_ERR
2720 		       "Userland tools for TOMOYO 2.5 must be installed and "
2721 		       "policy must be initialized.\n");
2722 		printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2723 		       "for more information.\n");
2724 		panic("STOP!");
2725 	}
2726 	tomoyo_read_unlock(idx);
2727 	printk(KERN_INFO "Mandatory Access Control activated.\n");
2728 }
2729 
2730 /**
2731  * tomoyo_load_builtin_policy - Load built-in policy.
2732  *
2733  * Returns nothing.
2734  */
tomoyo_load_builtin_policy(void)2735 void __init tomoyo_load_builtin_policy(void)
2736 {
2737 	/*
2738 	 * This include file is manually created and contains built-in policy
2739 	 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2740 	 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2741 	 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2742 	 */
2743 #include "builtin-policy.h"
2744 	u8 i;
2745 	const int idx = tomoyo_read_lock();
2746 	for (i = 0; i < 5; i++) {
2747 		struct tomoyo_io_buffer head = { };
2748 		char *start = "";
2749 		switch (i) {
2750 		case 0:
2751 			start = tomoyo_builtin_profile;
2752 			head.type = TOMOYO_PROFILE;
2753 			head.write = tomoyo_write_profile;
2754 			break;
2755 		case 1:
2756 			start = tomoyo_builtin_exception_policy;
2757 			head.type = TOMOYO_EXCEPTIONPOLICY;
2758 			head.write = tomoyo_write_exception;
2759 			break;
2760 		case 2:
2761 			start = tomoyo_builtin_domain_policy;
2762 			head.type = TOMOYO_DOMAINPOLICY;
2763 			head.write = tomoyo_write_domain;
2764 			break;
2765 		case 3:
2766 			start = tomoyo_builtin_manager;
2767 			head.type = TOMOYO_MANAGER;
2768 			head.write = tomoyo_write_manager;
2769 			break;
2770 		case 4:
2771 			start = tomoyo_builtin_stat;
2772 			head.type = TOMOYO_STAT;
2773 			head.write = tomoyo_write_stat;
2774 			break;
2775 		}
2776 		while (1) {
2777 			char *end = strchr(start, '\n');
2778 			if (!end)
2779 				break;
2780 			*end = '\0';
2781 			tomoyo_normalize_line(start);
2782 			head.write_buf = start;
2783 			tomoyo_parse_policy(&head, start);
2784 			start = end + 1;
2785 		}
2786 	}
2787 	tomoyo_read_unlock(idx);
2788 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2789 	tomoyo_check_profile();
2790 #endif
2791 }
2792