blob: f58701a7b728619a5a50e3bc74981baa23ab60cf [file] [log] [blame]
Paul Moore5778eab2007-02-28 15:14:22 -05001/*
2 * SELinux NetLabel Support
3 *
4 * This file provides the necessary glue to tie NetLabel into the SELinux
5 * subsystem.
6 *
7 * Author: Paul Moore <paul.moore@hp.com>
8 *
9 */
10
11/*
Paul Moore948bf852008-10-10 10:16:32 -040012 * (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008
Paul Moore5778eab2007-02-28 15:14:22 -050013 *
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
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 *
28 */
29
30#include <linux/spinlock.h>
31#include <linux/rcupdate.h>
Paul Moore014ab192008-10-10 10:16:33 -040032#include <linux/ip.h>
33#include <linux/ipv6.h>
Paul Moore5778eab2007-02-28 15:14:22 -050034#include <net/sock.h>
35#include <net/netlabel.h>
Paul Moore014ab192008-10-10 10:16:33 -040036#include <net/ip.h>
37#include <net/ipv6.h>
Paul Moore5778eab2007-02-28 15:14:22 -050038
39#include "objsec.h"
40#include "security.h"
Adrian Bunkd4ee4232008-02-27 23:20:42 +020041#include "netlabel.h"
Paul Moore5778eab2007-02-28 15:14:22 -050042
43/**
Paul Moore5dbe1eb2008-01-29 08:44:18 -050044 * 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 */
55static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
56 struct netlbl_lsm_secattr *secattr,
57 u32 *sid)
58{
59 int rc;
60
61 rc = security_netlbl_secattr_to_sid(secattr, sid);
62 if (rc == 0 &&
63 (secattr->flags & NETLBL_SECATTR_CACHEABLE) &&
64 (secattr->flags & NETLBL_SECATTR_CACHE))
65 netlbl_cache_add(skb, secattr);
66
67 return rc;
68}
69
70/**
Paul Moore6c5b3fc2008-10-10 10:16:33 -040071 * selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr
72 * @sk: the socket
73 *
74 * Description:
75 * Generate the NetLabel security attributes for a socket, making full use of
76 * the socket's attribute cache. Returns a pointer to the security attributes
77 * on success, NULL on failure.
78 *
79 */
80static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
81{
82 int rc;
83 struct sk_security_struct *sksec = sk->sk_security;
84 struct netlbl_lsm_secattr *secattr;
85
86 if (sksec->nlbl_secattr != NULL)
87 return sksec->nlbl_secattr;
88
89 secattr = netlbl_secattr_alloc(GFP_ATOMIC);
90 if (secattr == NULL)
91 return NULL;
92 rc = security_netlbl_sid_to_secattr(sksec->sid, secattr);
93 if (rc != 0) {
94 netlbl_secattr_free(secattr);
95 return NULL;
96 }
97 sksec->nlbl_secattr = secattr;
98
99 return secattr;
100}
101
102/**
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700103 * selinux_netlbl_sock_setsid - Label a socket using the NetLabel mechanism
104 * @sk: the socket to label
Paul Moore5778eab2007-02-28 15:14:22 -0500105 *
106 * Description:
Paul Mooreaccc6092008-10-10 10:16:29 -0400107 * Attempt to label a socket using the NetLabel mechanism. Returns zero values
108 * on success, negative values on failure.
Paul Moore5778eab2007-02-28 15:14:22 -0500109 *
110 */
Paul Mooreaccc6092008-10-10 10:16:29 -0400111static int selinux_netlbl_sock_setsid(struct sock *sk)
Paul Moore5778eab2007-02-28 15:14:22 -0500112{
113 int rc;
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700114 struct sk_security_struct *sksec = sk->sk_security;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400115 struct netlbl_lsm_secattr *secattr;
Paul Moore5778eab2007-02-28 15:14:22 -0500116
Paul Mooreaccc6092008-10-10 10:16:29 -0400117 if (sksec->nlbl_state != NLBL_REQUIRE)
118 return 0;
119
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400120 secattr = selinux_netlbl_sock_genattr(sk);
121 if (secattr == NULL)
122 return -ENOMEM;
123 rc = netlbl_sock_setattr(sk, secattr);
Paul Moore948bf852008-10-10 10:16:32 -0400124 switch (rc) {
125 case 0:
Paul Moore5778eab2007-02-28 15:14:22 -0500126 sksec->nlbl_state = NLBL_LABELED;
Paul Moore948bf852008-10-10 10:16:32 -0400127 break;
128 case -EDESTADDRREQ:
Paul Moore948bf852008-10-10 10:16:32 -0400129 sksec->nlbl_state = NLBL_REQSKB;
130 rc = 0;
131 break;
132 }
Paul Moore5778eab2007-02-28 15:14:22 -0500133
134 return rc;
135}
136
137/**
138 * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
139 *
140 * Description:
141 * Invalidate the NetLabel security attribute mapping cache.
142 *
143 */
144void selinux_netlbl_cache_invalidate(void)
145{
146 netlbl_cache_invalidate();
147}
148
149/**
Paul Mooredfaebe92008-10-10 10:16:31 -0400150 * selinux_netlbl_err - Handle a NetLabel packet error
151 * @skb: the packet
152 * @error: the error code
153 * @gateway: true if host is acting as a gateway, false otherwise
154 *
155 * Description:
156 * When a packet is dropped due to a call to avc_has_perm() pass the error
157 * code to the NetLabel subsystem so any protocol specific processing can be
158 * done. This is safe to call even if you are unsure if NetLabel labeling is
159 * present on the packet, NetLabel is smart enough to only act when it should.
160 *
161 */
162void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway)
163{
164 netlbl_skbuff_err(skb, error, gateway);
165}
166
167/**
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400168 * selinux_netlbl_sk_security_free - Free the NetLabel fields
169 * @sssec: the sk_security_struct
170 *
171 * Description:
172 * Free all of the memory in the NetLabel fields of a sk_security_struct.
173 *
174 */
175void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec)
176{
177 if (ssec->nlbl_secattr != NULL)
178 netlbl_secattr_free(ssec->nlbl_secattr);
179}
180
181/**
Paul Moore5778eab2007-02-28 15:14:22 -0500182 * selinux_netlbl_sk_security_reset - Reset the NetLabel fields
183 * @ssec: the sk_security_struct
184 * @family: the socket family
185 *
186 * Description:
187 * Called when the NetLabel state of a sk_security_struct needs to be reset.
188 * The caller is responsibile for all the NetLabel sk_security_struct locking.
189 *
190 */
191void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec,
192 int family)
193{
Eric Parisa6aaafe2008-04-18 17:38:23 -0400194 if (family == PF_INET)
Paul Moore5778eab2007-02-28 15:14:22 -0500195 ssec->nlbl_state = NLBL_REQUIRE;
196 else
197 ssec->nlbl_state = NLBL_UNSET;
198}
199
200/**
Paul Moore5778eab2007-02-28 15:14:22 -0500201 * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
202 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500203 * @family: protocol family
Paul Moore220deb92008-01-29 08:38:23 -0500204 * @type: NetLabel labeling protocol type
Paul Moore5778eab2007-02-28 15:14:22 -0500205 * @sid: the SID
206 *
207 * Description:
208 * Call the NetLabel mechanism to get the security attributes of the given
209 * packet and use those attributes to determine the correct context/SID to
210 * assign to the packet. Returns zero on success, negative values on failure.
211 *
212 */
Paul Moore75e22912008-01-29 08:38:04 -0500213int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
214 u16 family,
Paul Moore220deb92008-01-29 08:38:23 -0500215 u32 *type,
Paul Moore75e22912008-01-29 08:38:04 -0500216 u32 *sid)
Paul Moore5778eab2007-02-28 15:14:22 -0500217{
218 int rc;
219 struct netlbl_lsm_secattr secattr;
220
Paul Moore23bcdc12007-07-18 12:28:45 -0400221 if (!netlbl_enabled()) {
222 *sid = SECSID_NULL;
223 return 0;
224 }
225
Paul Moore5778eab2007-02-28 15:14:22 -0500226 netlbl_secattr_init(&secattr);
Paul Moore75e22912008-01-29 08:38:04 -0500227 rc = netlbl_skbuff_getattr(skb, family, &secattr);
Paul Moore5dbe1eb2008-01-29 08:44:18 -0500228 if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
229 rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid);
230 else
Paul Moore5778eab2007-02-28 15:14:22 -0500231 *sid = SECSID_NULL;
Paul Moore220deb92008-01-29 08:38:23 -0500232 *type = secattr.type;
Paul Moore5778eab2007-02-28 15:14:22 -0500233 netlbl_secattr_destroy(&secattr);
234
235 return rc;
236}
237
238/**
Paul Moore948bf852008-10-10 10:16:32 -0400239 * selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid
240 * @skb: the packet
241 * @family: protocol family
242 * @sid: the SID
243 *
244 * Description
245 * Call the NetLabel mechanism to set the label of a packet using @sid.
246 * Returns zero on auccess, negative values on failure.
247 *
248 */
249int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
250 u16 family,
251 u32 sid)
252{
253 int rc;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400254 struct netlbl_lsm_secattr secattr_storage;
255 struct netlbl_lsm_secattr *secattr = NULL;
Paul Moore948bf852008-10-10 10:16:32 -0400256 struct sock *sk;
257
258 /* if this is a locally generated packet check to see if it is already
259 * being labeled by it's parent socket, if it is just exit */
260 sk = skb->sk;
261 if (sk != NULL) {
262 struct sk_security_struct *sksec = sk->sk_security;
263 if (sksec->nlbl_state != NLBL_REQSKB)
264 return 0;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400265 secattr = sksec->nlbl_secattr;
266 }
267 if (secattr == NULL) {
268 secattr = &secattr_storage;
269 netlbl_secattr_init(secattr);
270 rc = security_netlbl_sid_to_secattr(sid, secattr);
271 if (rc != 0)
272 goto skbuff_setsid_return;
Paul Moore948bf852008-10-10 10:16:32 -0400273 }
274
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400275 rc = netlbl_skbuff_setattr(skb, family, secattr);
Paul Moore948bf852008-10-10 10:16:32 -0400276
277skbuff_setsid_return:
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400278 if (secattr == &secattr_storage)
279 netlbl_secattr_destroy(secattr);
Paul Moore948bf852008-10-10 10:16:32 -0400280 return rc;
281}
282
283/**
Paul Moore014ab192008-10-10 10:16:33 -0400284 * selinux_netlbl_inet_conn_established - Netlabel the newly accepted connection
Paul Moore5778eab2007-02-28 15:14:22 -0500285 * @sk: the new connection
Paul Moore5778eab2007-02-28 15:14:22 -0500286 *
287 * Description:
Paul Moore014ab192008-10-10 10:16:33 -0400288 * A new connection has been established on @sk so make sure it is labeled
289 * correctly with the NetLabel susbsystem.
Paul Moore5778eab2007-02-28 15:14:22 -0500290 *
291 */
Paul Moore014ab192008-10-10 10:16:33 -0400292void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family)
Paul Moore5778eab2007-02-28 15:14:22 -0500293{
Paul Moore014ab192008-10-10 10:16:33 -0400294 int rc;
295 struct sk_security_struct *sksec = sk->sk_security;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400296 struct netlbl_lsm_secattr *secattr;
Paul Moore014ab192008-10-10 10:16:33 -0400297 struct inet_sock *sk_inet = inet_sk(sk);
298 struct sockaddr_in addr;
299
300 if (sksec->nlbl_state != NLBL_REQUIRE)
301 return;
302
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400303 secattr = selinux_netlbl_sock_genattr(sk);
304 if (secattr == NULL)
305 return;
Paul Moore014ab192008-10-10 10:16:33 -0400306
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400307 rc = netlbl_sock_setattr(sk, secattr);
Paul Moore014ab192008-10-10 10:16:33 -0400308 switch (rc) {
309 case 0:
310 sksec->nlbl_state = NLBL_LABELED;
311 break;
312 case -EDESTADDRREQ:
313 /* no PF_INET6 support yet because we don't support any IPv6
314 * labeling protocols */
315 if (family != PF_INET) {
316 sksec->nlbl_state = NLBL_UNSET;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400317 return;
Paul Moore014ab192008-10-10 10:16:33 -0400318 }
319
320 addr.sin_family = family;
321 addr.sin_addr.s_addr = sk_inet->daddr;
322 if (netlbl_conn_setattr(sk, (struct sockaddr *)&addr,
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400323 secattr) != 0) {
Paul Moore014ab192008-10-10 10:16:33 -0400324 /* we failed to label the connected socket (could be
325 * for a variety of reasons, the actual "why" isn't
326 * important here) so we have to go to our backup plan,
327 * labeling the packets individually in the netfilter
328 * local output hook. this is okay but we need to
329 * adjust the MSS of the connection to take into
330 * account any labeling overhead, since we don't know
331 * the exact overhead at this point we'll use the worst
332 * case value which is 40 bytes for IPv4 */
333 struct inet_connection_sock *sk_conn = inet_csk(sk);
334 sk_conn->icsk_ext_hdr_len += 40 -
335 (sk_inet->opt ? sk_inet->opt->optlen : 0);
336 sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
337
338 sksec->nlbl_state = NLBL_REQSKB;
339 } else
340 sksec->nlbl_state = NLBL_CONNLABELED;
341 break;
342 default:
343 /* note that we are failing to label the socket which could be
344 * a bad thing since it means traffic could leave the system
345 * without the desired labeling, however, all is not lost as
346 * we have a check in selinux_netlbl_inode_permission() to
347 * pick up the pieces that we might drop here because we can't
348 * return an error code */
349 break;
350 }
Paul Moore5778eab2007-02-28 15:14:22 -0500351}
352
353/**
354 * selinux_netlbl_socket_post_create - Label a socket using NetLabel
355 * @sock: the socket to label
356 *
357 * Description:
358 * Attempt to label a socket using the NetLabel mechanism using the given
359 * SID. Returns zero values on success, negative values on failure.
360 *
361 */
362int selinux_netlbl_socket_post_create(struct socket *sock)
363{
Paul Mooreaccc6092008-10-10 10:16:29 -0400364 return selinux_netlbl_sock_setsid(sock->sk);
Paul Moore5778eab2007-02-28 15:14:22 -0500365}
366
367/**
368 * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled
369 * @inode: the file descriptor's inode
370 * @mask: the permission mask
371 *
372 * Description:
373 * Looks at a file's inode and if it is marked as a socket protected by
374 * NetLabel then verify that the socket has been labeled, if not try to label
375 * the socket now with the inode's SID. Returns zero on success, negative
376 * values on failure.
377 *
378 */
379int selinux_netlbl_inode_permission(struct inode *inode, int mask)
380{
381 int rc;
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700382 struct sock *sk;
Paul Moore5778eab2007-02-28 15:14:22 -0500383 struct socket *sock;
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700384 struct sk_security_struct *sksec;
Paul Moore5778eab2007-02-28 15:14:22 -0500385
386 if (!S_ISSOCK(inode->i_mode) ||
387 ((mask & (MAY_WRITE | MAY_APPEND)) == 0))
388 return 0;
Paul Mooref74af6e2008-02-25 11:40:33 -0500389
Paul Moore5778eab2007-02-28 15:14:22 -0500390 sock = SOCKET_I(inode);
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700391 sk = sock->sk;
392 sksec = sk->sk_security;
Paul Mooref74af6e2008-02-25 11:40:33 -0500393 if (sksec->nlbl_state != NLBL_REQUIRE)
Paul Moore5778eab2007-02-28 15:14:22 -0500394 return 0;
Paul Mooref74af6e2008-02-25 11:40:33 -0500395
Paul Moore5778eab2007-02-28 15:14:22 -0500396 local_bh_disable();
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700397 bh_lock_sock_nested(sk);
Paul Mooref74af6e2008-02-25 11:40:33 -0500398 if (likely(sksec->nlbl_state == NLBL_REQUIRE))
Paul Mooreaccc6092008-10-10 10:16:29 -0400399 rc = selinux_netlbl_sock_setsid(sk);
Paul Mooref74af6e2008-02-25 11:40:33 -0500400 else
401 rc = 0;
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700402 bh_unlock_sock(sk);
Paul Moore5778eab2007-02-28 15:14:22 -0500403 local_bh_enable();
Paul Moore5778eab2007-02-28 15:14:22 -0500404
405 return rc;
406}
407
408/**
409 * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
410 * @sksec: the sock's sk_security_struct
411 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -0500412 * @family: protocol family
Paul Moore5778eab2007-02-28 15:14:22 -0500413 * @ad: the audit data
414 *
415 * Description:
416 * Fetch the NetLabel security attributes from @skb and perform an access check
417 * against the receiving socket. Returns zero on success, negative values on
418 * error.
419 *
420 */
421int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
422 struct sk_buff *skb,
Paul Moore75e22912008-01-29 08:38:04 -0500423 u16 family,
Paul Moore5778eab2007-02-28 15:14:22 -0500424 struct avc_audit_data *ad)
425{
426 int rc;
Paul Mooref36158c2007-07-18 12:28:46 -0400427 u32 nlbl_sid;
428 u32 perm;
429 struct netlbl_lsm_secattr secattr;
Paul Moore5778eab2007-02-28 15:14:22 -0500430
Paul Moore23bcdc12007-07-18 12:28:45 -0400431 if (!netlbl_enabled())
432 return 0;
433
Paul Mooref36158c2007-07-18 12:28:46 -0400434 netlbl_secattr_init(&secattr);
Paul Moore75e22912008-01-29 08:38:04 -0500435 rc = netlbl_skbuff_getattr(skb, family, &secattr);
Paul Moore5dbe1eb2008-01-29 08:44:18 -0500436 if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
437 rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid);
438 else
Paul Mooref36158c2007-07-18 12:28:46 -0400439 nlbl_sid = SECINITSID_UNLABELED;
440 netlbl_secattr_destroy(&secattr);
Paul Moore5778eab2007-02-28 15:14:22 -0500441 if (rc != 0)
442 return rc;
Linus Torvalds8d9107e2007-07-13 16:53:18 -0700443
Paul Moore5778eab2007-02-28 15:14:22 -0500444 switch (sksec->sclass) {
445 case SECCLASS_UDP_SOCKET:
Paul Mooref36158c2007-07-18 12:28:46 -0400446 perm = UDP_SOCKET__RECVFROM;
Paul Moore5778eab2007-02-28 15:14:22 -0500447 break;
448 case SECCLASS_TCP_SOCKET:
Paul Mooref36158c2007-07-18 12:28:46 -0400449 perm = TCP_SOCKET__RECVFROM;
Paul Moore5778eab2007-02-28 15:14:22 -0500450 break;
451 default:
Paul Mooref36158c2007-07-18 12:28:46 -0400452 perm = RAWIP_SOCKET__RECVFROM;
Paul Moore5778eab2007-02-28 15:14:22 -0500453 }
454
Paul Mooref36158c2007-07-18 12:28:46 -0400455 rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
Paul Moore5778eab2007-02-28 15:14:22 -0500456 if (rc == 0)
457 return 0;
458
Paul Mooref36158c2007-07-18 12:28:46 -0400459 if (nlbl_sid != SECINITSID_UNLABELED)
Paul Mooredfaebe92008-10-10 10:16:31 -0400460 netlbl_skbuff_err(skb, rc, 0);
Paul Moore5778eab2007-02-28 15:14:22 -0500461 return rc;
462}
463
464/**
465 * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel
466 * @sock: the socket
467 * @level: the socket level or protocol
468 * @optname: the socket option name
469 *
470 * Description:
471 * Check the setsockopt() call and if the user is trying to replace the IP
472 * options on a socket and a NetLabel is in place for the socket deny the
473 * access; otherwise allow the access. Returns zero when the access is
474 * allowed, -EACCES when denied, and other negative values on error.
475 *
476 */
477int selinux_netlbl_socket_setsockopt(struct socket *sock,
478 int level,
479 int optname)
480{
481 int rc = 0;
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700482 struct sock *sk = sock->sk;
483 struct sk_security_struct *sksec = sk->sk_security;
Paul Moore5778eab2007-02-28 15:14:22 -0500484 struct netlbl_lsm_secattr secattr;
485
Paul Moore5778eab2007-02-28 15:14:22 -0500486 if (level == IPPROTO_IP && optname == IP_OPTIONS &&
Paul Moore014ab192008-10-10 10:16:33 -0400487 (sksec->nlbl_state == NLBL_LABELED ||
488 sksec->nlbl_state == NLBL_CONNLABELED)) {
Paul Moore5778eab2007-02-28 15:14:22 -0500489 netlbl_secattr_init(&secattr);
Paul Mooreba6ff9f2007-06-07 18:37:15 -0700490 lock_sock(sk);
491 rc = netlbl_sock_getattr(sk, &secattr);
492 release_sock(sk);
Paul Moore5778eab2007-02-28 15:14:22 -0500493 if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
494 rc = -EACCES;
495 netlbl_secattr_destroy(&secattr);
496 }
Paul Moore5778eab2007-02-28 15:14:22 -0500497
498 return rc;
499}
Paul Moore014ab192008-10-10 10:16:33 -0400500
501/**
502 * selinux_netlbl_socket_connect - Label a client-side socket on connect
503 * @sk: the socket to label
504 * @addr: the destination address
505 *
506 * Description:
507 * Attempt to label a connected socket with NetLabel using the given address.
508 * Returns zero values on success, negative values on failure.
509 *
510 */
511int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr)
512{
513 int rc;
514 struct sk_security_struct *sksec = sk->sk_security;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400515 struct netlbl_lsm_secattr *secattr;
Paul Moore014ab192008-10-10 10:16:33 -0400516
517 if (sksec->nlbl_state != NLBL_REQSKB &&
518 sksec->nlbl_state != NLBL_CONNLABELED)
519 return 0;
520
Paul Moore014ab192008-10-10 10:16:33 -0400521 local_bh_disable();
522 bh_lock_sock_nested(sk);
523
524 /* connected sockets are allowed to disconnect when the address family
525 * is set to AF_UNSPEC, if that is what is happening we want to reset
526 * the socket */
527 if (addr->sa_family == AF_UNSPEC) {
528 netlbl_sock_delattr(sk);
529 sksec->nlbl_state = NLBL_REQSKB;
530 rc = 0;
531 goto socket_connect_return;
532 }
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400533 secattr = selinux_netlbl_sock_genattr(sk);
534 if (secattr == NULL) {
535 rc = -ENOMEM;
Paul Moore014ab192008-10-10 10:16:33 -0400536 goto socket_connect_return;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400537 }
538 rc = netlbl_conn_setattr(sk, addr, secattr);
539 if (rc == 0)
540 sksec->nlbl_state = NLBL_CONNLABELED;
Paul Moore014ab192008-10-10 10:16:33 -0400541
542socket_connect_return:
543 bh_unlock_sock(sk);
544 local_bh_enable();
Paul Moore014ab192008-10-10 10:16:33 -0400545 return rc;
546}