1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * security/tomoyo/network.c
4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
7
8 #include "common.h"
9 #include <linux/slab.h>
10
11 /* Structure for holding inet domain socket's address. */
12 struct tomoyo_inet_addr_info {
13 __be16 port; /* In network byte order. */
14 const __be32 *address; /* In network byte order. */
15 bool is_ipv6;
16 };
17
18 /* Structure for holding unix domain socket's address. */
19 struct tomoyo_unix_addr_info {
20 u8 *addr; /* This may not be '\0' terminated string. */
21 unsigned int addr_len;
22 };
23
24 /* Structure for holding socket address. */
25 struct tomoyo_addr_info {
26 u8 protocol;
27 u8 operation;
28 struct tomoyo_inet_addr_info inet;
29 struct tomoyo_unix_addr_info unix0;
30 };
31
32 /* String table for socket's protocols. */
33 const char * const tomoyo_proto_keyword[TOMOYO_SOCK_MAX] = {
34 [SOCK_STREAM] = "stream",
35 [SOCK_DGRAM] = "dgram",
36 [SOCK_RAW] = "raw",
37 [SOCK_SEQPACKET] = "seqpacket",
38 [0] = " ", /* Dummy for avoiding NULL pointer dereference. */
39 [4] = " ", /* Dummy for avoiding NULL pointer dereference. */
40 };
41
42 /**
43 * tomoyo_parse_ipaddr_union - Parse an IP address.
44 *
45 * @param: Pointer to "struct tomoyo_acl_param".
46 * @ptr: Pointer to "struct tomoyo_ipaddr_union".
47 *
48 * Returns true on success, false otherwise.
49 */
tomoyo_parse_ipaddr_union(struct tomoyo_acl_param * param,struct tomoyo_ipaddr_union * ptr)50 bool tomoyo_parse_ipaddr_union(struct tomoyo_acl_param *param,
51 struct tomoyo_ipaddr_union *ptr)
52 {
53 u8 * const min = ptr->ip[0].in6_u.u6_addr8;
54 u8 * const max = ptr->ip[1].in6_u.u6_addr8;
55 char *address = tomoyo_read_token(param);
56 const char *end;
57
58 if (!strchr(address, ':') &&
59 in4_pton(address, -1, min, '-', &end) > 0) {
60 ptr->is_ipv6 = false;
61 if (!*end)
62 ptr->ip[1].s6_addr32[0] = ptr->ip[0].s6_addr32[0];
63 else if (*end++ != '-' ||
64 in4_pton(end, -1, max, '\0', &end) <= 0 || *end)
65 return false;
66 return true;
67 }
68 if (in6_pton(address, -1, min, '-', &end) > 0) {
69 ptr->is_ipv6 = true;
70 if (!*end)
71 memmove(max, min, sizeof(u16) * 8);
72 else if (*end++ != '-' ||
73 in6_pton(end, -1, max, '\0', &end) <= 0 || *end)
74 return false;
75 return true;
76 }
77 return false;
78 }
79
80 /**
81 * tomoyo_print_ipv4 - Print an IPv4 address.
82 *
83 * @buffer: Buffer to write to.
84 * @buffer_len: Size of @buffer.
85 * @min_ip: Pointer to __be32.
86 * @max_ip: Pointer to __be32.
87 *
88 * Returns nothing.
89 */
tomoyo_print_ipv4(char * buffer,const unsigned int buffer_len,const __be32 * min_ip,const __be32 * max_ip)90 static void tomoyo_print_ipv4(char *buffer, const unsigned int buffer_len,
91 const __be32 *min_ip, const __be32 *max_ip)
92 {
93 snprintf(buffer, buffer_len, "%pI4%c%pI4", min_ip,
94 *min_ip == *max_ip ? '\0' : '-', max_ip);
95 }
96
97 /**
98 * tomoyo_print_ipv6 - Print an IPv6 address.
99 *
100 * @buffer: Buffer to write to.
101 * @buffer_len: Size of @buffer.
102 * @min_ip: Pointer to "struct in6_addr".
103 * @max_ip: Pointer to "struct in6_addr".
104 *
105 * Returns nothing.
106 */
tomoyo_print_ipv6(char * buffer,const unsigned int buffer_len,const struct in6_addr * min_ip,const struct in6_addr * max_ip)107 static void tomoyo_print_ipv6(char *buffer, const unsigned int buffer_len,
108 const struct in6_addr *min_ip,
109 const struct in6_addr *max_ip)
110 {
111 snprintf(buffer, buffer_len, "%pI6c%c%pI6c", min_ip,
112 !memcmp(min_ip, max_ip, 16) ? '\0' : '-', max_ip);
113 }
114
115 /**
116 * tomoyo_print_ip - Print an IP address.
117 *
118 * @buf: Buffer to write to.
119 * @size: Size of @buf.
120 * @ptr: Pointer to "struct ipaddr_union".
121 *
122 * Returns nothing.
123 */
tomoyo_print_ip(char * buf,const unsigned int size,const struct tomoyo_ipaddr_union * ptr)124 void tomoyo_print_ip(char *buf, const unsigned int size,
125 const struct tomoyo_ipaddr_union *ptr)
126 {
127 if (ptr->is_ipv6)
128 tomoyo_print_ipv6(buf, size, &ptr->ip[0], &ptr->ip[1]);
129 else
130 tomoyo_print_ipv4(buf, size, &ptr->ip[0].s6_addr32[0],
131 &ptr->ip[1].s6_addr32[0]);
132 }
133
134 /*
135 * Mapping table from "enum tomoyo_network_acl_index" to
136 * "enum tomoyo_mac_index" for inet domain socket.
137 */
138 static const u8 tomoyo_inet2mac
139 [TOMOYO_SOCK_MAX][TOMOYO_MAX_NETWORK_OPERATION] = {
140 [SOCK_STREAM] = {
141 [TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_INET_STREAM_BIND,
142 [TOMOYO_NETWORK_LISTEN] =
143 TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN,
144 [TOMOYO_NETWORK_CONNECT] =
145 TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT,
146 },
147 [SOCK_DGRAM] = {
148 [TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_INET_DGRAM_BIND,
149 [TOMOYO_NETWORK_SEND] = TOMOYO_MAC_NETWORK_INET_DGRAM_SEND,
150 },
151 [SOCK_RAW] = {
152 [TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_INET_RAW_BIND,
153 [TOMOYO_NETWORK_SEND] = TOMOYO_MAC_NETWORK_INET_RAW_SEND,
154 },
155 };
156
157 /*
158 * Mapping table from "enum tomoyo_network_acl_index" to
159 * "enum tomoyo_mac_index" for unix domain socket.
160 */
161 static const u8 tomoyo_unix2mac
162 [TOMOYO_SOCK_MAX][TOMOYO_MAX_NETWORK_OPERATION] = {
163 [SOCK_STREAM] = {
164 [TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND,
165 [TOMOYO_NETWORK_LISTEN] =
166 TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN,
167 [TOMOYO_NETWORK_CONNECT] =
168 TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT,
169 },
170 [SOCK_DGRAM] = {
171 [TOMOYO_NETWORK_BIND] = TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND,
172 [TOMOYO_NETWORK_SEND] = TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND,
173 },
174 [SOCK_SEQPACKET] = {
175 [TOMOYO_NETWORK_BIND] =
176 TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND,
177 [TOMOYO_NETWORK_LISTEN] =
178 TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN,
179 [TOMOYO_NETWORK_CONNECT] =
180 TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT,
181 },
182 };
183
184 /**
185 * tomoyo_same_inet_acl - Check for duplicated "struct tomoyo_inet_acl" entry.
186 *
187 * @a: Pointer to "struct tomoyo_acl_info".
188 * @b: Pointer to "struct tomoyo_acl_info".
189 *
190 * Returns true if @a == @b except permission bits, false otherwise.
191 */
tomoyo_same_inet_acl(const struct tomoyo_acl_info * a,const struct tomoyo_acl_info * b)192 static bool tomoyo_same_inet_acl(const struct tomoyo_acl_info *a,
193 const struct tomoyo_acl_info *b)
194 {
195 const struct tomoyo_inet_acl *p1 = container_of(a, typeof(*p1), head);
196 const struct tomoyo_inet_acl *p2 = container_of(b, typeof(*p2), head);
197
198 return p1->protocol == p2->protocol &&
199 tomoyo_same_ipaddr_union(&p1->address, &p2->address) &&
200 tomoyo_same_number_union(&p1->port, &p2->port);
201 }
202
203 /**
204 * tomoyo_same_unix_acl - Check for duplicated "struct tomoyo_unix_acl" entry.
205 *
206 * @a: Pointer to "struct tomoyo_acl_info".
207 * @b: Pointer to "struct tomoyo_acl_info".
208 *
209 * Returns true if @a == @b except permission bits, false otherwise.
210 */
tomoyo_same_unix_acl(const struct tomoyo_acl_info * a,const struct tomoyo_acl_info * b)211 static bool tomoyo_same_unix_acl(const struct tomoyo_acl_info *a,
212 const struct tomoyo_acl_info *b)
213 {
214 const struct tomoyo_unix_acl *p1 = container_of(a, typeof(*p1), head);
215 const struct tomoyo_unix_acl *p2 = container_of(b, typeof(*p2), head);
216
217 return p1->protocol == p2->protocol &&
218 tomoyo_same_name_union(&p1->name, &p2->name);
219 }
220
221 /**
222 * tomoyo_merge_inet_acl - Merge duplicated "struct tomoyo_inet_acl" entry.
223 *
224 * @a: Pointer to "struct tomoyo_acl_info".
225 * @b: Pointer to "struct tomoyo_acl_info".
226 * @is_delete: True for @a &= ~@b, false for @a |= @b.
227 *
228 * Returns true if @a is empty, false otherwise.
229 */
tomoyo_merge_inet_acl(struct tomoyo_acl_info * a,struct tomoyo_acl_info * b,const bool is_delete)230 static bool tomoyo_merge_inet_acl(struct tomoyo_acl_info *a,
231 struct tomoyo_acl_info *b,
232 const bool is_delete)
233 {
234 u8 * const a_perm =
235 &container_of(a, struct tomoyo_inet_acl, head)->perm;
236 u8 perm = *a_perm;
237 const u8 b_perm = container_of(b, struct tomoyo_inet_acl, head)->perm;
238
239 if (is_delete)
240 perm &= ~b_perm;
241 else
242 perm |= b_perm;
243 *a_perm = perm;
244 return !perm;
245 }
246
247 /**
248 * tomoyo_merge_unix_acl - Merge duplicated "struct tomoyo_unix_acl" entry.
249 *
250 * @a: Pointer to "struct tomoyo_acl_info".
251 * @b: Pointer to "struct tomoyo_acl_info".
252 * @is_delete: True for @a &= ~@b, false for @a |= @b.
253 *
254 * Returns true if @a is empty, false otherwise.
255 */
tomoyo_merge_unix_acl(struct tomoyo_acl_info * a,struct tomoyo_acl_info * b,const bool is_delete)256 static bool tomoyo_merge_unix_acl(struct tomoyo_acl_info *a,
257 struct tomoyo_acl_info *b,
258 const bool is_delete)
259 {
260 u8 * const a_perm =
261 &container_of(a, struct tomoyo_unix_acl, head)->perm;
262 u8 perm = *a_perm;
263 const u8 b_perm = container_of(b, struct tomoyo_unix_acl, head)->perm;
264
265 if (is_delete)
266 perm &= ~b_perm;
267 else
268 perm |= b_perm;
269 *a_perm = perm;
270 return !perm;
271 }
272
273 /**
274 * tomoyo_write_inet_network - Write "struct tomoyo_inet_acl" list.
275 *
276 * @param: Pointer to "struct tomoyo_acl_param".
277 *
278 * Returns 0 on success, negative value otherwise.
279 *
280 * Caller holds tomoyo_read_lock().
281 */
tomoyo_write_inet_network(struct tomoyo_acl_param * param)282 int tomoyo_write_inet_network(struct tomoyo_acl_param *param)
283 {
284 struct tomoyo_inet_acl e = { .head.type = TOMOYO_TYPE_INET_ACL };
285 int error = -EINVAL;
286 u8 type;
287 const char *protocol = tomoyo_read_token(param);
288 const char *operation = tomoyo_read_token(param);
289
290 for (e.protocol = 0; e.protocol < TOMOYO_SOCK_MAX; e.protocol++)
291 if (!strcmp(protocol, tomoyo_proto_keyword[e.protocol]))
292 break;
293 for (type = 0; type < TOMOYO_MAX_NETWORK_OPERATION; type++)
294 if (tomoyo_permstr(operation, tomoyo_socket_keyword[type]))
295 e.perm |= 1 << type;
296 if (e.protocol == TOMOYO_SOCK_MAX || !e.perm)
297 return -EINVAL;
298 if (param->data[0] == '@') {
299 param->data++;
300 e.address.group =
301 tomoyo_get_group(param, TOMOYO_ADDRESS_GROUP);
302 if (!e.address.group)
303 return -ENOMEM;
304 } else {
305 if (!tomoyo_parse_ipaddr_union(param, &e.address))
306 goto out;
307 }
308 if (!tomoyo_parse_number_union(param, &e.port) ||
309 e.port.values[1] > 65535)
310 goto out;
311 error = tomoyo_update_domain(&e.head, sizeof(e), param,
312 tomoyo_same_inet_acl,
313 tomoyo_merge_inet_acl);
314 out:
315 tomoyo_put_group(e.address.group);
316 tomoyo_put_number_union(&e.port);
317 return error;
318 }
319
320 /**
321 * tomoyo_write_unix_network - Write "struct tomoyo_unix_acl" list.
322 *
323 * @param: Pointer to "struct tomoyo_acl_param".
324 *
325 * Returns 0 on success, negative value otherwise.
326 */
tomoyo_write_unix_network(struct tomoyo_acl_param * param)327 int tomoyo_write_unix_network(struct tomoyo_acl_param *param)
328 {
329 struct tomoyo_unix_acl e = { .head.type = TOMOYO_TYPE_UNIX_ACL };
330 int error;
331 u8 type;
332 const char *protocol = tomoyo_read_token(param);
333 const char *operation = tomoyo_read_token(param);
334
335 for (e.protocol = 0; e.protocol < TOMOYO_SOCK_MAX; e.protocol++)
336 if (!strcmp(protocol, tomoyo_proto_keyword[e.protocol]))
337 break;
338 for (type = 0; type < TOMOYO_MAX_NETWORK_OPERATION; type++)
339 if (tomoyo_permstr(operation, tomoyo_socket_keyword[type]))
340 e.perm |= 1 << type;
341 if (e.protocol == TOMOYO_SOCK_MAX || !e.perm)
342 return -EINVAL;
343 if (!tomoyo_parse_name_union(param, &e.name))
344 return -EINVAL;
345 error = tomoyo_update_domain(&e.head, sizeof(e), param,
346 tomoyo_same_unix_acl,
347 tomoyo_merge_unix_acl);
348 tomoyo_put_name_union(&e.name);
349 return error;
350 }
351
352 /**
353 * tomoyo_audit_net_log - Audit network log.
354 *
355 * @r: Pointer to "struct tomoyo_request_info".
356 * @family: Name of socket family ("inet" or "unix").
357 * @protocol: Name of protocol in @family.
358 * @operation: Name of socket operation.
359 * @address: Name of address.
360 *
361 * Returns 0 on success, negative value otherwise.
362 */
tomoyo_audit_net_log(struct tomoyo_request_info * r,const char * family,const u8 protocol,const u8 operation,const char * address)363 static int tomoyo_audit_net_log(struct tomoyo_request_info *r,
364 const char *family, const u8 protocol,
365 const u8 operation, const char *address)
366 {
367 return tomoyo_supervisor(r, "network %s %s %s %s\n", family,
368 tomoyo_proto_keyword[protocol],
369 tomoyo_socket_keyword[operation], address);
370 }
371
372 /**
373 * tomoyo_audit_inet_log - Audit INET network log.
374 *
375 * @r: Pointer to "struct tomoyo_request_info".
376 *
377 * Returns 0 on success, negative value otherwise.
378 */
tomoyo_audit_inet_log(struct tomoyo_request_info * r)379 static int tomoyo_audit_inet_log(struct tomoyo_request_info *r)
380 {
381 char buf[128];
382 int len;
383 const __be32 *address = r->param.inet_network.address;
384
385 if (r->param.inet_network.is_ipv6)
386 tomoyo_print_ipv6(buf, sizeof(buf), (const struct in6_addr *)
387 address, (const struct in6_addr *) address);
388 else
389 tomoyo_print_ipv4(buf, sizeof(buf), address, address);
390 len = strlen(buf);
391 snprintf(buf + len, sizeof(buf) - len, " %u",
392 r->param.inet_network.port);
393 return tomoyo_audit_net_log(r, "inet", r->param.inet_network.protocol,
394 r->param.inet_network.operation, buf);
395 }
396
397 /**
398 * tomoyo_audit_unix_log - Audit UNIX network log.
399 *
400 * @r: Pointer to "struct tomoyo_request_info".
401 *
402 * Returns 0 on success, negative value otherwise.
403 */
tomoyo_audit_unix_log(struct tomoyo_request_info * r)404 static int tomoyo_audit_unix_log(struct tomoyo_request_info *r)
405 {
406 return tomoyo_audit_net_log(r, "unix", r->param.unix_network.protocol,
407 r->param.unix_network.operation,
408 r->param.unix_network.address->name);
409 }
410
411 /**
412 * tomoyo_check_inet_acl - Check permission for inet domain socket operation.
413 *
414 * @r: Pointer to "struct tomoyo_request_info".
415 * @ptr: Pointer to "struct tomoyo_acl_info".
416 *
417 * Returns true if granted, false otherwise.
418 */
tomoyo_check_inet_acl(struct tomoyo_request_info * r,const struct tomoyo_acl_info * ptr)419 static bool tomoyo_check_inet_acl(struct tomoyo_request_info *r,
420 const struct tomoyo_acl_info *ptr)
421 {
422 const struct tomoyo_inet_acl *acl =
423 container_of(ptr, typeof(*acl), head);
424 const u8 size = r->param.inet_network.is_ipv6 ? 16 : 4;
425
426 if (!(acl->perm & (1 << r->param.inet_network.operation)) ||
427 !tomoyo_compare_number_union(r->param.inet_network.port,
428 &acl->port))
429 return false;
430 if (acl->address.group)
431 return tomoyo_address_matches_group
432 (r->param.inet_network.is_ipv6,
433 r->param.inet_network.address, acl->address.group);
434 return acl->address.is_ipv6 == r->param.inet_network.is_ipv6 &&
435 memcmp(&acl->address.ip[0],
436 r->param.inet_network.address, size) <= 0 &&
437 memcmp(r->param.inet_network.address,
438 &acl->address.ip[1], size) <= 0;
439 }
440
441 /**
442 * tomoyo_check_unix_acl - Check permission for unix domain socket operation.
443 *
444 * @r: Pointer to "struct tomoyo_request_info".
445 * @ptr: Pointer to "struct tomoyo_acl_info".
446 *
447 * Returns true if granted, false otherwise.
448 */
tomoyo_check_unix_acl(struct tomoyo_request_info * r,const struct tomoyo_acl_info * ptr)449 static bool tomoyo_check_unix_acl(struct tomoyo_request_info *r,
450 const struct tomoyo_acl_info *ptr)
451 {
452 const struct tomoyo_unix_acl *acl =
453 container_of(ptr, typeof(*acl), head);
454
455 return (acl->perm & (1 << r->param.unix_network.operation)) &&
456 tomoyo_compare_name_union(r->param.unix_network.address,
457 &acl->name);
458 }
459
460 /**
461 * tomoyo_inet_entry - Check permission for INET network operation.
462 *
463 * @address: Pointer to "struct tomoyo_addr_info".
464 *
465 * Returns 0 on success, negative value otherwise.
466 */
tomoyo_inet_entry(const struct tomoyo_addr_info * address)467 static int tomoyo_inet_entry(const struct tomoyo_addr_info *address)
468 {
469 const int idx = tomoyo_read_lock();
470 struct tomoyo_request_info r;
471 int error = 0;
472 const u8 type = tomoyo_inet2mac[address->protocol][address->operation];
473
474 if (type && tomoyo_init_request_info(&r, NULL, type)
475 != TOMOYO_CONFIG_DISABLED) {
476 r.param_type = TOMOYO_TYPE_INET_ACL;
477 r.param.inet_network.protocol = address->protocol;
478 r.param.inet_network.operation = address->operation;
479 r.param.inet_network.is_ipv6 = address->inet.is_ipv6;
480 r.param.inet_network.address = address->inet.address;
481 r.param.inet_network.port = ntohs(address->inet.port);
482 do {
483 tomoyo_check_acl(&r, tomoyo_check_inet_acl);
484 error = tomoyo_audit_inet_log(&r);
485 } while (error == TOMOYO_RETRY_REQUEST);
486 }
487 tomoyo_read_unlock(idx);
488 return error;
489 }
490
491 /**
492 * tomoyo_check_inet_address - Check permission for inet domain socket's operation.
493 *
494 * @addr: Pointer to "struct sockaddr".
495 * @addr_len: Size of @addr.
496 * @port: Port number.
497 * @address: Pointer to "struct tomoyo_addr_info".
498 *
499 * Returns 0 on success, negative value otherwise.
500 */
tomoyo_check_inet_address(const struct sockaddr * addr,const unsigned int addr_len,const u16 port,struct tomoyo_addr_info * address)501 static int tomoyo_check_inet_address(const struct sockaddr *addr,
502 const unsigned int addr_len,
503 const u16 port,
504 struct tomoyo_addr_info *address)
505 {
506 struct tomoyo_inet_addr_info *i = &address->inet;
507
508 if (addr_len < offsetofend(struct sockaddr, sa_family))
509 return 0;
510 switch (addr->sa_family) {
511 case AF_INET6:
512 if (addr_len < SIN6_LEN_RFC2133)
513 goto skip;
514 i->is_ipv6 = true;
515 i->address = (__be32 *)
516 ((struct sockaddr_in6 *) addr)->sin6_addr.s6_addr;
517 i->port = ((struct sockaddr_in6 *) addr)->sin6_port;
518 break;
519 case AF_INET:
520 if (addr_len < sizeof(struct sockaddr_in))
521 goto skip;
522 i->is_ipv6 = false;
523 i->address = (__be32 *)
524 &((struct sockaddr_in *) addr)->sin_addr;
525 i->port = ((struct sockaddr_in *) addr)->sin_port;
526 break;
527 default:
528 goto skip;
529 }
530 if (address->protocol == SOCK_RAW)
531 i->port = htons(port);
532 return tomoyo_inet_entry(address);
533 skip:
534 return 0;
535 }
536
537 /**
538 * tomoyo_unix_entry - Check permission for UNIX network operation.
539 *
540 * @address: Pointer to "struct tomoyo_addr_info".
541 *
542 * Returns 0 on success, negative value otherwise.
543 */
tomoyo_unix_entry(const struct tomoyo_addr_info * address)544 static int tomoyo_unix_entry(const struct tomoyo_addr_info *address)
545 {
546 const int idx = tomoyo_read_lock();
547 struct tomoyo_request_info r;
548 int error = 0;
549 const u8 type = tomoyo_unix2mac[address->protocol][address->operation];
550
551 if (type && tomoyo_init_request_info(&r, NULL, type)
552 != TOMOYO_CONFIG_DISABLED) {
553 char *buf = address->unix0.addr;
554 int len = address->unix0.addr_len - sizeof(sa_family_t);
555
556 if (len <= 0) {
557 buf = "anonymous";
558 len = 9;
559 } else if (buf[0]) {
560 len = strnlen(buf, len);
561 }
562 buf = tomoyo_encode2(buf, len);
563 if (buf) {
564 struct tomoyo_path_info addr;
565
566 addr.name = buf;
567 tomoyo_fill_path_info(&addr);
568 r.param_type = TOMOYO_TYPE_UNIX_ACL;
569 r.param.unix_network.protocol = address->protocol;
570 r.param.unix_network.operation = address->operation;
571 r.param.unix_network.address = &addr;
572 do {
573 tomoyo_check_acl(&r, tomoyo_check_unix_acl);
574 error = tomoyo_audit_unix_log(&r);
575 } while (error == TOMOYO_RETRY_REQUEST);
576 kfree(buf);
577 } else
578 error = -ENOMEM;
579 }
580 tomoyo_read_unlock(idx);
581 return error;
582 }
583
584 /**
585 * tomoyo_check_unix_address - Check permission for unix domain socket's operation.
586 *
587 * @addr: Pointer to "struct sockaddr".
588 * @addr_len: Size of @addr.
589 * @address: Pointer to "struct tomoyo_addr_info".
590 *
591 * Returns 0 on success, negative value otherwise.
592 */
tomoyo_check_unix_address(struct sockaddr * addr,const unsigned int addr_len,struct tomoyo_addr_info * address)593 static int tomoyo_check_unix_address(struct sockaddr *addr,
594 const unsigned int addr_len,
595 struct tomoyo_addr_info *address)
596 {
597 struct tomoyo_unix_addr_info *u = &address->unix0;
598
599 if (addr_len < offsetofend(struct sockaddr, sa_family))
600 return 0;
601 if (addr->sa_family != AF_UNIX)
602 return 0;
603 u->addr = ((struct sockaddr_un *) addr)->sun_path;
604 u->addr_len = addr_len;
605 return tomoyo_unix_entry(address);
606 }
607
608 /**
609 * tomoyo_kernel_service - Check whether I'm kernel service or not.
610 *
611 * Returns true if I'm kernel service, false otherwise.
612 */
tomoyo_kernel_service(void)613 static bool tomoyo_kernel_service(void)
614 {
615 /* Nothing to do if I am a kernel service. */
616 return uaccess_kernel();
617 }
618
619 /**
620 * tomoyo_sock_family - Get socket's family.
621 *
622 * @sk: Pointer to "struct sock".
623 *
624 * Returns one of PF_INET, PF_INET6, PF_UNIX or 0.
625 */
tomoyo_sock_family(struct sock * sk)626 static u8 tomoyo_sock_family(struct sock *sk)
627 {
628 u8 family;
629
630 if (tomoyo_kernel_service())
631 return 0;
632 family = sk->sk_family;
633 switch (family) {
634 case PF_INET:
635 case PF_INET6:
636 case PF_UNIX:
637 return family;
638 default:
639 return 0;
640 }
641 }
642
643 /**
644 * tomoyo_socket_listen_permission - Check permission for listening a socket.
645 *
646 * @sock: Pointer to "struct socket".
647 *
648 * Returns 0 on success, negative value otherwise.
649 */
tomoyo_socket_listen_permission(struct socket * sock)650 int tomoyo_socket_listen_permission(struct socket *sock)
651 {
652 struct tomoyo_addr_info address;
653 const u8 family = tomoyo_sock_family(sock->sk);
654 const unsigned int type = sock->type;
655 struct sockaddr_storage addr;
656 int addr_len;
657
658 if (!family || (type != SOCK_STREAM && type != SOCK_SEQPACKET))
659 return 0;
660 {
661 const int error = sock->ops->getname(sock, (struct sockaddr *)
662 &addr, 0);
663
664 if (error < 0)
665 return error;
666 addr_len = error;
667 }
668 address.protocol = type;
669 address.operation = TOMOYO_NETWORK_LISTEN;
670 if (family == PF_UNIX)
671 return tomoyo_check_unix_address((struct sockaddr *) &addr,
672 addr_len, &address);
673 return tomoyo_check_inet_address((struct sockaddr *) &addr, addr_len,
674 0, &address);
675 }
676
677 /**
678 * tomoyo_socket_connect_permission - Check permission for setting the remote address of a socket.
679 *
680 * @sock: Pointer to "struct socket".
681 * @addr: Pointer to "struct sockaddr".
682 * @addr_len: Size of @addr.
683 *
684 * Returns 0 on success, negative value otherwise.
685 */
tomoyo_socket_connect_permission(struct socket * sock,struct sockaddr * addr,int addr_len)686 int tomoyo_socket_connect_permission(struct socket *sock,
687 struct sockaddr *addr, int addr_len)
688 {
689 struct tomoyo_addr_info address;
690 const u8 family = tomoyo_sock_family(sock->sk);
691 const unsigned int type = sock->type;
692
693 if (!family)
694 return 0;
695 address.protocol = type;
696 switch (type) {
697 case SOCK_DGRAM:
698 case SOCK_RAW:
699 address.operation = TOMOYO_NETWORK_SEND;
700 break;
701 case SOCK_STREAM:
702 case SOCK_SEQPACKET:
703 address.operation = TOMOYO_NETWORK_CONNECT;
704 break;
705 default:
706 return 0;
707 }
708 if (family == PF_UNIX)
709 return tomoyo_check_unix_address(addr, addr_len, &address);
710 return tomoyo_check_inet_address(addr, addr_len, sock->sk->sk_protocol,
711 &address);
712 }
713
714 /**
715 * tomoyo_socket_bind_permission - Check permission for setting the local address of a socket.
716 *
717 * @sock: Pointer to "struct socket".
718 * @addr: Pointer to "struct sockaddr".
719 * @addr_len: Size of @addr.
720 *
721 * Returns 0 on success, negative value otherwise.
722 */
tomoyo_socket_bind_permission(struct socket * sock,struct sockaddr * addr,int addr_len)723 int tomoyo_socket_bind_permission(struct socket *sock, struct sockaddr *addr,
724 int addr_len)
725 {
726 struct tomoyo_addr_info address;
727 const u8 family = tomoyo_sock_family(sock->sk);
728 const unsigned int type = sock->type;
729
730 if (!family)
731 return 0;
732 switch (type) {
733 case SOCK_STREAM:
734 case SOCK_DGRAM:
735 case SOCK_RAW:
736 case SOCK_SEQPACKET:
737 address.protocol = type;
738 address.operation = TOMOYO_NETWORK_BIND;
739 break;
740 default:
741 return 0;
742 }
743 if (family == PF_UNIX)
744 return tomoyo_check_unix_address(addr, addr_len, &address);
745 return tomoyo_check_inet_address(addr, addr_len, sock->sk->sk_protocol,
746 &address);
747 }
748
749 /**
750 * tomoyo_socket_sendmsg_permission - Check permission for sending a datagram.
751 *
752 * @sock: Pointer to "struct socket".
753 * @msg: Pointer to "struct msghdr".
754 * @size: Unused.
755 *
756 * Returns 0 on success, negative value otherwise.
757 */
tomoyo_socket_sendmsg_permission(struct socket * sock,struct msghdr * msg,int size)758 int tomoyo_socket_sendmsg_permission(struct socket *sock, struct msghdr *msg,
759 int size)
760 {
761 struct tomoyo_addr_info address;
762 const u8 family = tomoyo_sock_family(sock->sk);
763 const unsigned int type = sock->type;
764
765 if (!msg->msg_name || !family ||
766 (type != SOCK_DGRAM && type != SOCK_RAW))
767 return 0;
768 address.protocol = type;
769 address.operation = TOMOYO_NETWORK_SEND;
770 if (family == PF_UNIX)
771 return tomoyo_check_unix_address((struct sockaddr *)
772 msg->msg_name,
773 msg->msg_namelen, &address);
774 return tomoyo_check_inet_address((struct sockaddr *) msg->msg_name,
775 msg->msg_namelen,
776 sock->sk->sk_protocol, &address);
777 }
778
