Commit | Line | Data |
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5778eabd PM |
1 | /* |
2 | * SELinux NetLabel Support | |
3 | * | |
4 | * This file provides the necessary glue to tie NetLabel into the SELinux | |
5 | * subsystem. | |
6 | * | |
82c21bfa | 7 | * Author: Paul Moore <paul@paul-moore.com> |
5778eabd PM |
8 | * |
9 | */ | |
10 | ||
11 | /* | |
948bf85c | 12 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008 |
5778eabd PM |
13 | * |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
22 | * the GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
4f0753e7 | 25 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
5778eabd PM |
26 | * |
27 | */ | |
28 | ||
29 | #include <linux/spinlock.h> | |
30 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 31 | #include <linux/gfp.h> |
014ab19a PM |
32 | #include <linux/ip.h> |
33 | #include <linux/ipv6.h> | |
5778eabd PM |
34 | #include <net/sock.h> |
35 | #include <net/netlabel.h> | |
014ab19a PM |
36 | #include <net/ip.h> |
37 | #include <net/ipv6.h> | |
5778eabd PM |
38 | |
39 | #include "objsec.h" | |
40 | #include "security.h" | |
d4ee4231 | 41 | #include "netlabel.h" |
5778eabd | 42 | |
5dbe1eb0 PM |
43 | /** |
44 | * selinux_netlbl_sidlookup_cached - Cache a SID lookup | |
45 | * @skb: the packet | |
46 | * @secattr: the NetLabel security attributes | |
47 | * @sid: the SID | |
48 | * | |
49 | * Description: | |
50 | * Query the SELinux security server to lookup the correct SID for the given | |
51 | * security attributes. If the query is successful, cache the result to speed | |
52 | * up future lookups. Returns zero on success, negative values on failure. | |
53 | * | |
54 | */ | |
55 | static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb, | |
4fee5242 | 56 | u16 family, |
5dbe1eb0 PM |
57 | struct netlbl_lsm_secattr *secattr, |
58 | u32 *sid) | |
59 | { | |
60 | int rc; | |
61 | ||
aa8e712c | 62 | rc = security_netlbl_secattr_to_sid(&selinux_state, secattr, sid); |
5dbe1eb0 PM |
63 | if (rc == 0 && |
64 | (secattr->flags & NETLBL_SECATTR_CACHEABLE) && | |
65 | (secattr->flags & NETLBL_SECATTR_CACHE)) | |
4fee5242 | 66 | netlbl_cache_add(skb, family, secattr); |
5dbe1eb0 PM |
67 | |
68 | return rc; | |
69 | } | |
70 | ||
6c5b3fc0 PM |
71 | /** |
72 | * selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr | |
73 | * @sk: the socket | |
74 | * | |
75 | * Description: | |
76 | * Generate the NetLabel security attributes for a socket, making full use of | |
77 | * the socket's attribute cache. Returns a pointer to the security attributes | |
78 | * on success, NULL on failure. | |
79 | * | |
80 | */ | |
81 | static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk) | |
82 | { | |
83 | int rc; | |
84 | struct sk_security_struct *sksec = sk->sk_security; | |
85 | struct netlbl_lsm_secattr *secattr; | |
86 | ||
87 | if (sksec->nlbl_secattr != NULL) | |
88 | return sksec->nlbl_secattr; | |
89 | ||
90 | secattr = netlbl_secattr_alloc(GFP_ATOMIC); | |
91 | if (secattr == NULL) | |
92 | return NULL; | |
aa8e712c SS |
93 | rc = security_netlbl_sid_to_secattr(&selinux_state, sksec->sid, |
94 | secattr); | |
6c5b3fc0 PM |
95 | if (rc != 0) { |
96 | netlbl_secattr_free(secattr); | |
97 | return NULL; | |
98 | } | |
99 | sksec->nlbl_secattr = secattr; | |
100 | ||
101 | return secattr; | |
102 | } | |
103 | ||
050d032b PM |
104 | /** |
105 | * selinux_netlbl_sock_getattr - Get the cached NetLabel secattr | |
106 | * @sk: the socket | |
107 | * @sid: the SID | |
108 | * | |
109 | * Query the socket's cached secattr and if the SID matches the cached value | |
110 | * return the cache, otherwise return NULL. | |
111 | * | |
112 | */ | |
113 | static struct netlbl_lsm_secattr *selinux_netlbl_sock_getattr( | |
114 | const struct sock *sk, | |
115 | u32 sid) | |
116 | { | |
117 | struct sk_security_struct *sksec = sk->sk_security; | |
118 | struct netlbl_lsm_secattr *secattr = sksec->nlbl_secattr; | |
119 | ||
120 | if (secattr == NULL) | |
121 | return NULL; | |
122 | ||
123 | if ((secattr->flags & NETLBL_SECATTR_SECID) && | |
124 | (secattr->attr.secid == sid)) | |
125 | return secattr; | |
126 | ||
127 | return NULL; | |
128 | } | |
129 | ||
5778eabd PM |
130 | /** |
131 | * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache | |
132 | * | |
133 | * Description: | |
134 | * Invalidate the NetLabel security attribute mapping cache. | |
135 | * | |
136 | */ | |
137 | void selinux_netlbl_cache_invalidate(void) | |
138 | { | |
139 | netlbl_cache_invalidate(); | |
140 | } | |
141 | ||
dfaebe98 PM |
142 | /** |
143 | * selinux_netlbl_err - Handle a NetLabel packet error | |
144 | * @skb: the packet | |
145 | * @error: the error code | |
146 | * @gateway: true if host is acting as a gateway, false otherwise | |
147 | * | |
148 | * Description: | |
149 | * When a packet is dropped due to a call to avc_has_perm() pass the error | |
150 | * code to the NetLabel subsystem so any protocol specific processing can be | |
151 | * done. This is safe to call even if you are unsure if NetLabel labeling is | |
152 | * present on the packet, NetLabel is smart enough to only act when it should. | |
153 | * | |
154 | */ | |
a04e71f6 | 155 | void selinux_netlbl_err(struct sk_buff *skb, u16 family, int error, int gateway) |
dfaebe98 | 156 | { |
a04e71f6 | 157 | netlbl_skbuff_err(skb, family, error, gateway); |
dfaebe98 PM |
158 | } |
159 | ||
6c5b3fc0 PM |
160 | /** |
161 | * selinux_netlbl_sk_security_free - Free the NetLabel fields | |
dd3e7836 | 162 | * @sksec: the sk_security_struct |
6c5b3fc0 PM |
163 | * |
164 | * Description: | |
165 | * Free all of the memory in the NetLabel fields of a sk_security_struct. | |
166 | * | |
167 | */ | |
dd3e7836 | 168 | void selinux_netlbl_sk_security_free(struct sk_security_struct *sksec) |
6c5b3fc0 | 169 | { |
dd3e7836 EP |
170 | if (sksec->nlbl_secattr != NULL) |
171 | netlbl_secattr_free(sksec->nlbl_secattr); | |
6c5b3fc0 PM |
172 | } |
173 | ||
5778eabd PM |
174 | /** |
175 | * selinux_netlbl_sk_security_reset - Reset the NetLabel fields | |
dd3e7836 | 176 | * @sksec: the sk_security_struct |
5778eabd PM |
177 | * @family: the socket family |
178 | * | |
179 | * Description: | |
180 | * Called when the NetLabel state of a sk_security_struct needs to be reset. | |
25985edc | 181 | * The caller is responsible for all the NetLabel sk_security_struct locking. |
5778eabd PM |
182 | * |
183 | */ | |
dd3e7836 | 184 | void selinux_netlbl_sk_security_reset(struct sk_security_struct *sksec) |
5778eabd | 185 | { |
dd3e7836 | 186 | sksec->nlbl_state = NLBL_UNSET; |
5778eabd PM |
187 | } |
188 | ||
5778eabd PM |
189 | /** |
190 | * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel | |
191 | * @skb: the packet | |
75e22910 | 192 | * @family: protocol family |
220deb96 | 193 | * @type: NetLabel labeling protocol type |
5778eabd PM |
194 | * @sid: the SID |
195 | * | |
196 | * Description: | |
197 | * Call the NetLabel mechanism to get the security attributes of the given | |
198 | * packet and use those attributes to determine the correct context/SID to | |
199 | * assign to the packet. Returns zero on success, negative values on failure. | |
200 | * | |
201 | */ | |
75e22910 PM |
202 | int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, |
203 | u16 family, | |
220deb96 | 204 | u32 *type, |
75e22910 | 205 | u32 *sid) |
5778eabd PM |
206 | { |
207 | int rc; | |
208 | struct netlbl_lsm_secattr secattr; | |
209 | ||
23bcdc1a PM |
210 | if (!netlbl_enabled()) { |
211 | *sid = SECSID_NULL; | |
212 | return 0; | |
213 | } | |
214 | ||
5778eabd | 215 | netlbl_secattr_init(&secattr); |
75e22910 | 216 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
5dbe1eb0 | 217 | if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) |
4fee5242 HD |
218 | rc = selinux_netlbl_sidlookup_cached(skb, family, |
219 | &secattr, sid); | |
5dbe1eb0 | 220 | else |
5778eabd | 221 | *sid = SECSID_NULL; |
220deb96 | 222 | *type = secattr.type; |
5778eabd PM |
223 | netlbl_secattr_destroy(&secattr); |
224 | ||
225 | return rc; | |
226 | } | |
227 | ||
948bf85c PM |
228 | /** |
229 | * selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid | |
230 | * @skb: the packet | |
231 | * @family: protocol family | |
232 | * @sid: the SID | |
233 | * | |
234 | * Description | |
235 | * Call the NetLabel mechanism to set the label of a packet using @sid. | |
af901ca1 | 236 | * Returns zero on success, negative values on failure. |
948bf85c PM |
237 | * |
238 | */ | |
239 | int selinux_netlbl_skbuff_setsid(struct sk_buff *skb, | |
240 | u16 family, | |
241 | u32 sid) | |
242 | { | |
243 | int rc; | |
6c5b3fc0 PM |
244 | struct netlbl_lsm_secattr secattr_storage; |
245 | struct netlbl_lsm_secattr *secattr = NULL; | |
948bf85c PM |
246 | struct sock *sk; |
247 | ||
248 | /* if this is a locally generated packet check to see if it is already | |
249 | * being labeled by it's parent socket, if it is just exit */ | |
54abc686 | 250 | sk = skb_to_full_sk(skb); |
948bf85c PM |
251 | if (sk != NULL) { |
252 | struct sk_security_struct *sksec = sk->sk_security; | |
d452930f | 253 | |
948bf85c PM |
254 | if (sksec->nlbl_state != NLBL_REQSKB) |
255 | return 0; | |
050d032b | 256 | secattr = selinux_netlbl_sock_getattr(sk, sid); |
6c5b3fc0 PM |
257 | } |
258 | if (secattr == NULL) { | |
259 | secattr = &secattr_storage; | |
260 | netlbl_secattr_init(secattr); | |
aa8e712c SS |
261 | rc = security_netlbl_sid_to_secattr(&selinux_state, sid, |
262 | secattr); | |
6c5b3fc0 PM |
263 | if (rc != 0) |
264 | goto skbuff_setsid_return; | |
948bf85c PM |
265 | } |
266 | ||
6c5b3fc0 | 267 | rc = netlbl_skbuff_setattr(skb, family, secattr); |
948bf85c PM |
268 | |
269 | skbuff_setsid_return: | |
6c5b3fc0 PM |
270 | if (secattr == &secattr_storage) |
271 | netlbl_secattr_destroy(secattr); | |
948bf85c PM |
272 | return rc; |
273 | } | |
274 | ||
d452930f RH |
275 | /** |
276 | * selinux_netlbl_sctp_assoc_request - Label an incoming sctp association. | |
277 | * @ep: incoming association endpoint. | |
278 | * @skb: the packet. | |
279 | * | |
280 | * Description: | |
281 | * A new incoming connection is represented by @ep, ...... | |
282 | * Returns zero on success, negative values on failure. | |
283 | * | |
284 | */ | |
285 | int selinux_netlbl_sctp_assoc_request(struct sctp_endpoint *ep, | |
286 | struct sk_buff *skb) | |
287 | { | |
288 | int rc; | |
289 | struct netlbl_lsm_secattr secattr; | |
290 | struct sk_security_struct *sksec = ep->base.sk->sk_security; | |
291 | struct sockaddr *addr; | |
292 | struct sockaddr_in addr4; | |
293 | #if IS_ENABLED(CONFIG_IPV6) | |
294 | struct sockaddr_in6 addr6; | |
295 | #endif | |
296 | ||
297 | if (ep->base.sk->sk_family != PF_INET && | |
298 | ep->base.sk->sk_family != PF_INET6) | |
299 | return 0; | |
300 | ||
301 | netlbl_secattr_init(&secattr); | |
aa8e712c SS |
302 | rc = security_netlbl_sid_to_secattr(&selinux_state, |
303 | ep->secid, &secattr); | |
d452930f RH |
304 | if (rc != 0) |
305 | goto assoc_request_return; | |
306 | ||
307 | /* Move skb hdr address info to a struct sockaddr and then call | |
308 | * netlbl_conn_setattr(). | |
309 | */ | |
310 | if (ip_hdr(skb)->version == 4) { | |
311 | addr4.sin_family = AF_INET; | |
312 | addr4.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
313 | addr = (struct sockaddr *)&addr4; | |
314 | #if IS_ENABLED(CONFIG_IPV6) | |
315 | } else { | |
316 | addr6.sin6_family = AF_INET6; | |
317 | addr6.sin6_addr = ipv6_hdr(skb)->saddr; | |
318 | addr = (struct sockaddr *)&addr6; | |
319 | #endif | |
320 | } | |
321 | ||
322 | rc = netlbl_conn_setattr(ep->base.sk, addr, &secattr); | |
323 | if (rc == 0) | |
324 | sksec->nlbl_state = NLBL_LABELED; | |
325 | ||
326 | assoc_request_return: | |
327 | netlbl_secattr_destroy(&secattr); | |
328 | return rc; | |
329 | } | |
330 | ||
5778eabd | 331 | /** |
389fb800 PM |
332 | * selinux_netlbl_inet_conn_request - Label an incoming stream connection |
333 | * @req: incoming connection request socket | |
5778eabd PM |
334 | * |
335 | * Description: | |
389fb800 PM |
336 | * A new incoming connection request is represented by @req, we need to label |
337 | * the new request_sock here and the stack will ensure the on-the-wire label | |
338 | * will get preserved when a full sock is created once the connection handshake | |
339 | * is complete. Returns zero on success, negative values on failure. | |
5778eabd PM |
340 | * |
341 | */ | |
389fb800 | 342 | int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family) |
5778eabd | 343 | { |
014ab19a | 344 | int rc; |
389fb800 | 345 | struct netlbl_lsm_secattr secattr; |
014ab19a | 346 | |
e1adea92 | 347 | if (family != PF_INET && family != PF_INET6) |
389fb800 | 348 | return 0; |
014ab19a | 349 | |
389fb800 | 350 | netlbl_secattr_init(&secattr); |
aa8e712c SS |
351 | rc = security_netlbl_sid_to_secattr(&selinux_state, req->secid, |
352 | &secattr); | |
389fb800 PM |
353 | if (rc != 0) |
354 | goto inet_conn_request_return; | |
355 | rc = netlbl_req_setattr(req, &secattr); | |
356 | inet_conn_request_return: | |
357 | netlbl_secattr_destroy(&secattr); | |
358 | return rc; | |
5778eabd PM |
359 | } |
360 | ||
361 | /** | |
389fb800 PM |
362 | * selinux_netlbl_inet_csk_clone - Initialize the newly created sock |
363 | * @sk: the new sock | |
5778eabd PM |
364 | * |
365 | * Description: | |
389fb800 PM |
366 | * A new connection has been established using @sk, we've already labeled the |
367 | * socket via the request_sock struct in selinux_netlbl_inet_conn_request() but | |
368 | * we need to set the NetLabel state here since we now have a sock structure. | |
5778eabd PM |
369 | * |
370 | */ | |
389fb800 | 371 | void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family) |
5778eabd | 372 | { |
389fb800 PM |
373 | struct sk_security_struct *sksec = sk->sk_security; |
374 | ||
375 | if (family == PF_INET) | |
376 | sksec->nlbl_state = NLBL_LABELED; | |
377 | else | |
378 | sksec->nlbl_state = NLBL_UNSET; | |
5778eabd PM |
379 | } |
380 | ||
d452930f RH |
381 | /** |
382 | * selinux_netlbl_sctp_sk_clone - Copy state to the newly created sock | |
383 | * @sk: current sock | |
384 | * @newsk: the new sock | |
385 | * | |
386 | * Description: | |
387 | * Called whenever a new socket is created by accept(2) or sctp_peeloff(3). | |
388 | */ | |
389 | void selinux_netlbl_sctp_sk_clone(struct sock *sk, struct sock *newsk) | |
390 | { | |
391 | struct sk_security_struct *sksec = sk->sk_security; | |
392 | struct sk_security_struct *newsksec = newsk->sk_security; | |
393 | ||
394 | newsksec->nlbl_state = sksec->nlbl_state; | |
395 | } | |
396 | ||
5778eabd | 397 | /** |
389fb800 PM |
398 | * selinux_netlbl_socket_post_create - Label a socket using NetLabel |
399 | * @sock: the socket to label | |
400 | * @family: protocol family | |
5778eabd PM |
401 | * |
402 | * Description: | |
389fb800 PM |
403 | * Attempt to label a socket using the NetLabel mechanism using the given |
404 | * SID. Returns zero values on success, negative values on failure. | |
5778eabd PM |
405 | * |
406 | */ | |
389fb800 | 407 | int selinux_netlbl_socket_post_create(struct sock *sk, u16 family) |
5778eabd PM |
408 | { |
409 | int rc; | |
389fb800 PM |
410 | struct sk_security_struct *sksec = sk->sk_security; |
411 | struct netlbl_lsm_secattr *secattr; | |
5778eabd | 412 | |
ceba1832 | 413 | if (family != PF_INET && family != PF_INET6) |
5778eabd | 414 | return 0; |
f74af6e8 | 415 | |
389fb800 PM |
416 | secattr = selinux_netlbl_sock_genattr(sk); |
417 | if (secattr == NULL) | |
418 | return -ENOMEM; | |
419 | rc = netlbl_sock_setattr(sk, family, secattr); | |
420 | switch (rc) { | |
421 | case 0: | |
422 | sksec->nlbl_state = NLBL_LABELED; | |
423 | break; | |
424 | case -EDESTADDRREQ: | |
425 | sksec->nlbl_state = NLBL_REQSKB; | |
f74af6e8 | 426 | rc = 0; |
389fb800 PM |
427 | break; |
428 | } | |
5778eabd PM |
429 | |
430 | return rc; | |
431 | } | |
432 | ||
433 | /** | |
434 | * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel | |
435 | * @sksec: the sock's sk_security_struct | |
436 | * @skb: the packet | |
75e22910 | 437 | * @family: protocol family |
5778eabd PM |
438 | * @ad: the audit data |
439 | * | |
440 | * Description: | |
441 | * Fetch the NetLabel security attributes from @skb and perform an access check | |
442 | * against the receiving socket. Returns zero on success, negative values on | |
443 | * error. | |
444 | * | |
445 | */ | |
446 | int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, | |
447 | struct sk_buff *skb, | |
75e22910 | 448 | u16 family, |
2bf49690 | 449 | struct common_audit_data *ad) |
5778eabd PM |
450 | { |
451 | int rc; | |
f36158c4 PM |
452 | u32 nlbl_sid; |
453 | u32 perm; | |
454 | struct netlbl_lsm_secattr secattr; | |
5778eabd | 455 | |
23bcdc1a PM |
456 | if (!netlbl_enabled()) |
457 | return 0; | |
458 | ||
f36158c4 | 459 | netlbl_secattr_init(&secattr); |
75e22910 | 460 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
5dbe1eb0 | 461 | if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) |
4fee5242 HD |
462 | rc = selinux_netlbl_sidlookup_cached(skb, family, |
463 | &secattr, &nlbl_sid); | |
5dbe1eb0 | 464 | else |
f36158c4 PM |
465 | nlbl_sid = SECINITSID_UNLABELED; |
466 | netlbl_secattr_destroy(&secattr); | |
5778eabd PM |
467 | if (rc != 0) |
468 | return rc; | |
8d9107e8 | 469 | |
5778eabd PM |
470 | switch (sksec->sclass) { |
471 | case SECCLASS_UDP_SOCKET: | |
f36158c4 | 472 | perm = UDP_SOCKET__RECVFROM; |
5778eabd PM |
473 | break; |
474 | case SECCLASS_TCP_SOCKET: | |
f36158c4 | 475 | perm = TCP_SOCKET__RECVFROM; |
5778eabd PM |
476 | break; |
477 | default: | |
f36158c4 | 478 | perm = RAWIP_SOCKET__RECVFROM; |
5778eabd PM |
479 | } |
480 | ||
6b6bc620 SS |
481 | rc = avc_has_perm(&selinux_state, |
482 | sksec->sid, nlbl_sid, sksec->sclass, perm, ad); | |
5778eabd PM |
483 | if (rc == 0) |
484 | return 0; | |
485 | ||
f36158c4 | 486 | if (nlbl_sid != SECINITSID_UNLABELED) |
a04e71f6 | 487 | netlbl_skbuff_err(skb, family, rc, 0); |
5778eabd PM |
488 | return rc; |
489 | } | |
490 | ||
1f440c99 HD |
491 | /** |
492 | * selinux_netlbl_option - Is this a NetLabel option | |
493 | * @level: the socket level or protocol | |
494 | * @optname: the socket option name | |
495 | * | |
496 | * Description: | |
497 | * Returns true if @level and @optname refer to a NetLabel option. | |
498 | * Helper for selinux_netlbl_socket_setsockopt(). | |
499 | */ | |
500 | static inline int selinux_netlbl_option(int level, int optname) | |
501 | { | |
502 | return (level == IPPROTO_IP && optname == IP_OPTIONS) || | |
503 | (level == IPPROTO_IPV6 && optname == IPV6_HOPOPTS); | |
504 | } | |
505 | ||
5778eabd PM |
506 | /** |
507 | * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel | |
508 | * @sock: the socket | |
509 | * @level: the socket level or protocol | |
510 | * @optname: the socket option name | |
511 | * | |
512 | * Description: | |
513 | * Check the setsockopt() call and if the user is trying to replace the IP | |
514 | * options on a socket and a NetLabel is in place for the socket deny the | |
515 | * access; otherwise allow the access. Returns zero when the access is | |
516 | * allowed, -EACCES when denied, and other negative values on error. | |
517 | * | |
518 | */ | |
519 | int selinux_netlbl_socket_setsockopt(struct socket *sock, | |
520 | int level, | |
521 | int optname) | |
522 | { | |
523 | int rc = 0; | |
ba6ff9f2 PM |
524 | struct sock *sk = sock->sk; |
525 | struct sk_security_struct *sksec = sk->sk_security; | |
5778eabd PM |
526 | struct netlbl_lsm_secattr secattr; |
527 | ||
1f440c99 | 528 | if (selinux_netlbl_option(level, optname) && |
014ab19a PM |
529 | (sksec->nlbl_state == NLBL_LABELED || |
530 | sksec->nlbl_state == NLBL_CONNLABELED)) { | |
5778eabd | 531 | netlbl_secattr_init(&secattr); |
ba6ff9f2 | 532 | lock_sock(sk); |
050d032b PM |
533 | /* call the netlabel function directly as we want to see the |
534 | * on-the-wire label that is assigned via the socket's options | |
535 | * and not the cached netlabel/lsm attributes */ | |
ba6ff9f2 PM |
536 | rc = netlbl_sock_getattr(sk, &secattr); |
537 | release_sock(sk); | |
09c50b4a | 538 | if (rc == 0) |
5778eabd | 539 | rc = -EACCES; |
09c50b4a PM |
540 | else if (rc == -ENOMSG) |
541 | rc = 0; | |
5778eabd PM |
542 | netlbl_secattr_destroy(&secattr); |
543 | } | |
5778eabd PM |
544 | |
545 | return rc; | |
546 | } | |
014ab19a PM |
547 | |
548 | /** | |
d452930f RH |
549 | * selinux_netlbl_socket_connect_helper - Help label a client-side socket on |
550 | * connect | |
014ab19a PM |
551 | * @sk: the socket to label |
552 | * @addr: the destination address | |
553 | * | |
554 | * Description: | |
555 | * Attempt to label a connected socket with NetLabel using the given address. | |
556 | * Returns zero values on success, negative values on failure. | |
557 | * | |
558 | */ | |
d452930f RH |
559 | static int selinux_netlbl_socket_connect_helper(struct sock *sk, |
560 | struct sockaddr *addr) | |
014ab19a PM |
561 | { |
562 | int rc; | |
563 | struct sk_security_struct *sksec = sk->sk_security; | |
6c5b3fc0 | 564 | struct netlbl_lsm_secattr *secattr; |
014ab19a | 565 | |
014ab19a PM |
566 | /* connected sockets are allowed to disconnect when the address family |
567 | * is set to AF_UNSPEC, if that is what is happening we want to reset | |
568 | * the socket */ | |
569 | if (addr->sa_family == AF_UNSPEC) { | |
570 | netlbl_sock_delattr(sk); | |
571 | sksec->nlbl_state = NLBL_REQSKB; | |
572 | rc = 0; | |
d452930f | 573 | return rc; |
014ab19a | 574 | } |
6c5b3fc0 PM |
575 | secattr = selinux_netlbl_sock_genattr(sk); |
576 | if (secattr == NULL) { | |
577 | rc = -ENOMEM; | |
d452930f | 578 | return rc; |
6c5b3fc0 PM |
579 | } |
580 | rc = netlbl_conn_setattr(sk, addr, secattr); | |
581 | if (rc == 0) | |
582 | sksec->nlbl_state = NLBL_CONNLABELED; | |
014ab19a | 583 | |
d452930f RH |
584 | return rc; |
585 | } | |
586 | ||
587 | /** | |
588 | * selinux_netlbl_socket_connect_locked - Label a client-side socket on | |
589 | * connect | |
590 | * @sk: the socket to label | |
591 | * @addr: the destination address | |
592 | * | |
593 | * Description: | |
594 | * Attempt to label a connected socket that already has the socket locked | |
595 | * with NetLabel using the given address. | |
596 | * Returns zero values on success, negative values on failure. | |
597 | * | |
598 | */ | |
599 | int selinux_netlbl_socket_connect_locked(struct sock *sk, | |
600 | struct sockaddr *addr) | |
601 | { | |
602 | struct sk_security_struct *sksec = sk->sk_security; | |
603 | ||
604 | if (sksec->nlbl_state != NLBL_REQSKB && | |
605 | sksec->nlbl_state != NLBL_CONNLABELED) | |
606 | return 0; | |
607 | ||
608 | return selinux_netlbl_socket_connect_helper(sk, addr); | |
609 | } | |
610 | ||
611 | /** | |
612 | * selinux_netlbl_socket_connect - Label a client-side socket on connect | |
613 | * @sk: the socket to label | |
614 | * @addr: the destination address | |
615 | * | |
616 | * Description: | |
617 | * Attempt to label a connected socket with NetLabel using the given address. | |
618 | * Returns zero values on success, negative values on failure. | |
619 | * | |
620 | */ | |
621 | int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr) | |
622 | { | |
623 | int rc; | |
624 | ||
625 | lock_sock(sk); | |
626 | rc = selinux_netlbl_socket_connect_locked(sk, addr); | |
42d64e1a | 627 | release_sock(sk); |
d452930f | 628 | |
014ab19a PM |
629 | return rc; |
630 | } |