1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
24 * Copyright (c) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
25 */
26
27 #include <sys/param.h>
28 #include <sys/errno.h>
29 #include <sys/vfs.h>
30 #include <sys/vnode.h>
31 #include <sys/cred.h>
32 #include <sys/cmn_err.h>
33 #include <sys/systm.h>
34 #include <sys/kmem.h>
35 #include <sys/pathname.h>
36 #include <sys/utsname.h>
37 #include <sys/debug.h>
38 #include <sys/door.h>
39 #include <sys/sdt.h>
40 #include <sys/thread.h>
41 #include <sys/avl.h>
42
43 #include <rpc/types.h>
44 #include <rpc/auth.h>
45 #include <rpc/clnt.h>
46
47 #include <nfs/nfs.h>
48 #include <nfs/export.h>
49 #include <nfs/nfs_clnt.h>
50 #include <nfs/auth.h>
51
52 static struct kmem_cache *exi_cache_handle;
53 static void exi_cache_reclaim(void *);
54 static void exi_cache_trim(struct exportinfo *exi);
55
56 extern pri_t minclsyspri;
57
58 volatile uint_t nfsauth_cache_hit;
59 volatile uint_t nfsauth_cache_miss;
60 volatile uint_t nfsauth_cache_refresh;
61 volatile uint_t nfsauth_cache_reclaim;
62
63 /*
64 * The lifetime of an auth cache entry:
65 * ------------------------------------
66 *
67 * An auth cache entry is created with both the auth_time
68 * and auth_freshness times set to the current time.
69 *
70 * Upon every client access which results in a hit, the
71 * auth_time will be updated.
72 *
73 * If a client access determines that the auth_freshness
74 * indicates that the entry is STALE, then it will be
75 * refreshed. Note that this will explicitly reset
76 * auth_time.
77 *
78 * When the REFRESH successfully occurs, then the
79 * auth_freshness is updated.
80 *
81 * There are two ways for an entry to leave the cache:
82 *
83 * 1) Purged by an action on the export (remove or changed)
84 * 2) Memory backpressure from the kernel (check against NFSAUTH_CACHE_TRIM)
85 *
86 * For 2) we check the timeout value against auth_time.
87 */
88
89 /*
90 * Number of seconds until we mark for refresh an auth cache entry.
91 */
92 #define NFSAUTH_CACHE_REFRESH 600
93
94 /*
95 * Number of idle seconds until we yield to backpressure
96 * to trim a cache entry.
97 */
98 #define NFSAUTH_CACHE_TRIM 3600
99
100 /*
101 * While we could encapuslate the exi_list inside the
102 * exi structure, we can't do that for the auth_list.
103 * So, to keep things looking clean, we keep them both
104 * in these external lists.
105 */
106 typedef struct refreshq_exi_node {
107 struct exportinfo *ren_exi;
108 list_t ren_authlist;
109 list_node_t ren_node;
110 } refreshq_exi_node_t;
111
112 typedef struct refreshq_auth_node {
113 struct auth_cache *ran_auth;
114 char *ran_netid;
115 list_node_t ran_node;
116 } refreshq_auth_node_t;
117
118 /*
119 * Used to manipulate things on the refreshq_queue.
120 * Note that the refresh thread will effectively
121 * pop a node off of the queue, at which point it
122 * will no longer need to hold the mutex.
123 */
124 static kmutex_t refreshq_lock;
125 static list_t refreshq_queue;
126 static kcondvar_t refreshq_cv;
127
128 /*
129 * If there is ever a problem with loading the
130 * module, then nfsauth_fini() needs to be called
131 * to remove state. In that event, since the
132 * refreshq thread has been started, they need to
133 * work together to get rid of state.
134 */
135 typedef enum nfsauth_refreshq_thread_state {
136 REFRESHQ_THREAD_RUNNING,
137 REFRESHQ_THREAD_FINI_REQ,
138 REFRESHQ_THREAD_HALTED
139 } nfsauth_refreshq_thread_state_t;
140
141 nfsauth_refreshq_thread_state_t
142 refreshq_thread_state = REFRESHQ_THREAD_HALTED;
143
144 static void nfsauth_free_node(struct auth_cache *);
145 static void nfsauth_refresh_thread(void);
146
147 static int nfsauth_cache_compar(const void *, const void *);
148
149 /*
150 * mountd is a server-side only daemon. This will need to be
151 * revisited if the NFS server is ever made zones-aware.
152 */
153 kmutex_t mountd_lock;
154 door_handle_t mountd_dh;
155
156 void
mountd_args(uint_t did)157 mountd_args(uint_t did)
158 {
159 mutex_enter(&mountd_lock);
160 if (mountd_dh != NULL)
161 door_ki_rele(mountd_dh);
162 mountd_dh = door_ki_lookup(did);
163 mutex_exit(&mountd_lock);
164 }
165
166 void
nfsauth_init(void)167 nfsauth_init(void)
168 {
169 /*
170 * mountd can be restarted by smf(5). We need to make sure
171 * the updated door handle will safely make it to mountd_dh
172 */
173 mutex_init(&mountd_lock, NULL, MUTEX_DEFAULT, NULL);
174
175 mutex_init(&refreshq_lock, NULL, MUTEX_DEFAULT, NULL);
176 list_create(&refreshq_queue, sizeof (refreshq_exi_node_t),
177 offsetof(refreshq_exi_node_t, ren_node));
178
179 cv_init(&refreshq_cv, NULL, CV_DEFAULT, NULL);
180
181 /*
182 * Allocate nfsauth cache handle
183 */
184 exi_cache_handle = kmem_cache_create("exi_cache_handle",
185 sizeof (struct auth_cache), 0, NULL, NULL,
186 exi_cache_reclaim, NULL, NULL, 0);
187
188 refreshq_thread_state = REFRESHQ_THREAD_RUNNING;
189 (void) zthread_create(NULL, 0, nfsauth_refresh_thread,
190 NULL, 0, minclsyspri);
191 }
192
193 /*
194 * Finalization routine for nfsauth. It is important to call this routine
195 * before destroying the exported_lock.
196 */
197 void
nfsauth_fini(void)198 nfsauth_fini(void)
199 {
200 refreshq_exi_node_t *ren;
201
202 /*
203 * Prevent the nfsauth_refresh_thread from getting new
204 * work.
205 */
206 mutex_enter(&refreshq_lock);
207 if (refreshq_thread_state != REFRESHQ_THREAD_HALTED) {
208 refreshq_thread_state = REFRESHQ_THREAD_FINI_REQ;
209 cv_broadcast(&refreshq_cv);
210
211 /*
212 * Also, wait for nfsauth_refresh_thread() to exit.
213 */
214 while (refreshq_thread_state != REFRESHQ_THREAD_HALTED) {
215 cv_wait(&refreshq_cv, &refreshq_lock);
216 }
217 }
218 mutex_exit(&refreshq_lock);
219
220 /*
221 * Walk the exi_list and in turn, walk the auth_lists and free all
222 * lists. In addition, free INVALID auth_cache entries.
223 */
224 while ((ren = list_remove_head(&refreshq_queue))) {
225 refreshq_auth_node_t *ran;
226
227 while ((ran = list_remove_head(&ren->ren_authlist)) != NULL) {
228 struct auth_cache *p = ran->ran_auth;
229 if (p->auth_state == NFS_AUTH_INVALID)
230 nfsauth_free_node(p);
231 strfree(ran->ran_netid);
232 kmem_free(ran, sizeof (refreshq_auth_node_t));
233 }
234
235 list_destroy(&ren->ren_authlist);
236 exi_rele(ren->ren_exi);
237 kmem_free(ren, sizeof (refreshq_exi_node_t));
238 }
239 list_destroy(&refreshq_queue);
240
241 cv_destroy(&refreshq_cv);
242 mutex_destroy(&refreshq_lock);
243
244 mutex_destroy(&mountd_lock);
245
246 /*
247 * Deallocate nfsauth cache handle
248 */
249 kmem_cache_destroy(exi_cache_handle);
250 }
251
252 /*
253 * Convert the address in a netbuf to
254 * a hash index for the auth_cache table.
255 */
256 static int
hash(struct netbuf * a)257 hash(struct netbuf *a)
258 {
259 int i, h = 0;
260
261 for (i = 0; i < a->len; i++)
262 h ^= a->buf[i];
263
264 return (h & (AUTH_TABLESIZE - 1));
265 }
266
267 /*
268 * Mask out the components of an
269 * address that do not identify
270 * a host. For socket addresses the
271 * masking gets rid of the port number.
272 */
273 static void
addrmask(struct netbuf * addr,struct netbuf * mask)274 addrmask(struct netbuf *addr, struct netbuf *mask)
275 {
276 int i;
277
278 for (i = 0; i < addr->len; i++)
279 addr->buf[i] &= mask->buf[i];
280 }
281
282 /*
283 * nfsauth4_access is used for NFS V4 auth checking. Besides doing
284 * the common nfsauth_access(), it will check if the client can
285 * have a limited access to this vnode even if the security flavor
286 * used does not meet the policy.
287 */
288 int
nfsauth4_access(struct exportinfo * exi,vnode_t * vp,struct svc_req * req,cred_t * cr,uid_t * uid,gid_t * gid,uint_t * ngids,gid_t ** gids)289 nfsauth4_access(struct exportinfo *exi, vnode_t *vp, struct svc_req *req,
290 cred_t *cr, uid_t *uid, gid_t *gid, uint_t *ngids, gid_t **gids)
291 {
292 int access;
293
294 rw_enter(&exported_lock, RW_READER);
295 access = nfsauth_access(exi, req, cr, uid, gid, ngids, gids);
296 rw_exit(&exported_lock);
297
298 /*
299 * There are cases that the server needs to allow the client
300 * to have a limited view.
301 *
302 * e.g.
303 * /export is shared as "sec=sys,rw=dfs-test-4,sec=krb5,rw"
304 * /export/home is shared as "sec=sys,rw"
305 *
306 * When the client mounts /export with sec=sys, the client
307 * would get a limited view with RO access on /export to see
308 * "home" only because the client is allowed to access
309 * /export/home with auth_sys.
310 */
311 if (access & NFSAUTH_DENIED || access & NFSAUTH_WRONGSEC) {
312 /*
313 * Allow ro permission with LIMITED view if there is a
314 * sub-dir exported under vp.
315 */
316 if (has_visible(exi, vp))
317 return (NFSAUTH_LIMITED);
318 }
319
320 return (access);
321 }
322
323 static void
sys_log(const char * msg)324 sys_log(const char *msg)
325 {
326 static time_t tstamp = 0;
327 time_t now;
328
329 /*
330 * msg is shown (at most) once per minute
331 */
332 now = gethrestime_sec();
333 if ((tstamp + 60) < now) {
334 tstamp = now;
335 cmn_err(CE_WARN, msg);
336 }
337 }
338
339 /*
340 * Callup to the mountd to get access information in the kernel.
341 */
342 static bool_t
nfsauth_retrieve(struct exportinfo * exi,char * req_netid,int flavor,struct netbuf * addr,int * access,uid_t clnt_uid,gid_t clnt_gid,uint_t clnt_gids_cnt,const gid_t * clnt_gids,uid_t * srv_uid,gid_t * srv_gid,uint_t * srv_gids_cnt,gid_t ** srv_gids)343 nfsauth_retrieve(struct exportinfo *exi, char *req_netid, int flavor,
344 struct netbuf *addr, int *access, uid_t clnt_uid, gid_t clnt_gid,
345 uint_t clnt_gids_cnt, const gid_t *clnt_gids, uid_t *srv_uid,
346 gid_t *srv_gid, uint_t *srv_gids_cnt, gid_t **srv_gids)
347 {
348 varg_t varg = {0};
349 nfsauth_res_t res = {0};
350 XDR xdrs;
351 size_t absz;
352 caddr_t abuf;
353 int last = 0;
354 door_arg_t da;
355 door_info_t di;
356 door_handle_t dh;
357 uint_t ntries = 0;
358
359 /*
360 * No entry in the cache for this client/flavor
361 * so we need to call the nfsauth service in the
362 * mount daemon.
363 */
364
365 varg.vers = V_PROTO;
366 varg.arg_u.arg.cmd = NFSAUTH_ACCESS;
367 varg.arg_u.arg.areq.req_client.n_len = addr->len;
368 varg.arg_u.arg.areq.req_client.n_bytes = addr->buf;
369 varg.arg_u.arg.areq.req_netid = req_netid;
370 varg.arg_u.arg.areq.req_path = exi->exi_export.ex_path;
371 varg.arg_u.arg.areq.req_flavor = flavor;
372 varg.arg_u.arg.areq.req_clnt_uid = clnt_uid;
373 varg.arg_u.arg.areq.req_clnt_gid = clnt_gid;
374 varg.arg_u.arg.areq.req_clnt_gids.len = clnt_gids_cnt;
375 varg.arg_u.arg.areq.req_clnt_gids.val = (gid_t *)clnt_gids;
376
377 DTRACE_PROBE1(nfsserv__func__nfsauth__varg, varg_t *, &varg);
378
379 /*
380 * Setup the XDR stream for encoding the arguments. Notice that
381 * in addition to the args having variable fields (req_netid and
382 * req_path), the argument data structure is itself versioned,
383 * so we need to make sure we can size the arguments buffer
384 * appropriately to encode all the args. If we can't get sizing
385 * info _or_ properly encode the arguments, there's really no
386 * point in continuting, so we fail the request.
387 */
388 if ((absz = xdr_sizeof(xdr_varg, &varg)) == 0) {
389 *access = NFSAUTH_DENIED;
390 return (FALSE);
391 }
392
393 abuf = (caddr_t)kmem_alloc(absz, KM_SLEEP);
394 xdrmem_create(&xdrs, abuf, absz, XDR_ENCODE);
395 if (!xdr_varg(&xdrs, &varg)) {
396 XDR_DESTROY(&xdrs);
397 goto fail;
398 }
399 XDR_DESTROY(&xdrs);
400
401 /*
402 * Prepare the door arguments
403 *
404 * We don't know the size of the message the daemon
405 * will pass back to us. By setting rbuf to NULL,
406 * we force the door code to allocate a buf of the
407 * appropriate size. We must set rsize > 0, however,
408 * else the door code acts as if no response was
409 * expected and doesn't pass the data to us.
410 */
411 da.data_ptr = (char *)abuf;
412 da.data_size = absz;
413 da.desc_ptr = NULL;
414 da.desc_num = 0;
415 da.rbuf = NULL;
416 da.rsize = 1;
417
418 retry:
419 mutex_enter(&mountd_lock);
420 dh = mountd_dh;
421 if (dh != NULL)
422 door_ki_hold(dh);
423 mutex_exit(&mountd_lock);
424
425 if (dh == NULL) {
426 /*
427 * The rendezvous point has not been established yet!
428 * This could mean that either mountd(1m) has not yet
429 * been started or that _this_ routine nuked the door
430 * handle after receiving an EINTR for a REVOKED door.
431 *
432 * Returning NFSAUTH_DROP will cause the NFS client
433 * to retransmit the request, so let's try to be more
434 * rescillient and attempt for ntries before we bail.
435 */
436 if (++ntries % NFSAUTH_DR_TRYCNT) {
437 delay(hz);
438 goto retry;
439 }
440
441 kmem_free(abuf, absz);
442
443 sys_log("nfsauth: mountd has not established door");
444 *access = NFSAUTH_DROP;
445 return (FALSE);
446 }
447
448 ntries = 0;
449
450 /*
451 * Now that we've got what we need, place the call.
452 */
453 switch (door_ki_upcall_limited(dh, &da, NULL, SIZE_MAX, 0)) {
454 case 0: /* Success */
455 door_ki_rele(dh);
456
457 if (da.data_ptr == NULL && da.data_size == 0) {
458 /*
459 * The door_return that contained the data
460 * failed! We're here because of the 2nd
461 * door_return (w/o data) such that we can
462 * get control of the thread (and exit
463 * gracefully).
464 */
465 DTRACE_PROBE1(nfsserv__func__nfsauth__door__nil,
466 door_arg_t *, &da);
467 goto fail;
468 }
469
470 break;
471
472 case EAGAIN:
473 /*
474 * Server out of resources; back off for a bit
475 */
476 door_ki_rele(dh);
477 delay(hz);
478 goto retry;
479 /* NOTREACHED */
480
481 case EINTR:
482 if (!door_ki_info(dh, &di)) {
483 door_ki_rele(dh);
484
485 if (di.di_attributes & DOOR_REVOKED) {
486 /*
487 * The server barfed and revoked
488 * the (existing) door on us; we
489 * want to wait to give smf(5) a
490 * chance to restart mountd(1m)
491 * and establish a new door handle.
492 */
493 mutex_enter(&mountd_lock);
494 if (dh == mountd_dh) {
495 door_ki_rele(mountd_dh);
496 mountd_dh = NULL;
497 }
498 mutex_exit(&mountd_lock);
499 delay(hz);
500 goto retry;
501 }
502 /*
503 * If the door was _not_ revoked on us,
504 * then more than likely we took an INTR,
505 * so we need to fail the operation.
506 */
507 goto fail;
508 }
509 /*
510 * The only failure that can occur from getting
511 * the door info is EINVAL, so we let the code
512 * below handle it.
513 */
514 /* FALLTHROUGH */
515
516 case EBADF:
517 case EINVAL:
518 default:
519 /*
520 * If we have a stale door handle, give smf a last
521 * chance to start it by sleeping for a little bit.
522 * If we're still hosed, we'll fail the call.
523 *
524 * Since we're going to reacquire the door handle
525 * upon the retry, we opt to sleep for a bit and
526 * _not_ to clear mountd_dh. If mountd restarted
527 * and was able to set mountd_dh, we should see
528 * the new instance; if not, we won't get caught
529 * up in the retry/DELAY loop.
530 */
531 door_ki_rele(dh);
532 if (!last) {
533 delay(hz);
534 last++;
535 goto retry;
536 }
537 sys_log("nfsauth: stale mountd door handle");
538 goto fail;
539 }
540
541 ASSERT(da.rbuf != NULL);
542
543 /*
544 * No door errors encountered; setup the XDR stream for decoding
545 * the results. If we fail to decode the results, we've got no
546 * other recourse than to fail the request.
547 */
548 xdrmem_create(&xdrs, da.rbuf, da.rsize, XDR_DECODE);
549 if (!xdr_nfsauth_res(&xdrs, &res)) {
550 xdr_free(xdr_nfsauth_res, (char *)&res);
551 XDR_DESTROY(&xdrs);
552 kmem_free(da.rbuf, da.rsize);
553 goto fail;
554 }
555 XDR_DESTROY(&xdrs);
556 kmem_free(da.rbuf, da.rsize);
557
558 DTRACE_PROBE1(nfsserv__func__nfsauth__results, nfsauth_res_t *, &res);
559 switch (res.stat) {
560 case NFSAUTH_DR_OKAY:
561 *access = res.ares.auth_perm;
562 *srv_uid = res.ares.auth_srv_uid;
563 *srv_gid = res.ares.auth_srv_gid;
564 *srv_gids_cnt = res.ares.auth_srv_gids.len;
565 *srv_gids = kmem_alloc(*srv_gids_cnt * sizeof (gid_t),
566 KM_SLEEP);
567 bcopy(res.ares.auth_srv_gids.val, *srv_gids,
568 *srv_gids_cnt * sizeof (gid_t));
569 break;
570
571 case NFSAUTH_DR_EFAIL:
572 case NFSAUTH_DR_DECERR:
573 case NFSAUTH_DR_BADCMD:
574 default:
575 xdr_free(xdr_nfsauth_res, (char *)&res);
576 fail:
577 *access = NFSAUTH_DENIED;
578 kmem_free(abuf, absz);
579 return (FALSE);
580 /* NOTREACHED */
581 }
582
583 xdr_free(xdr_nfsauth_res, (char *)&res);
584 kmem_free(abuf, absz);
585
586 return (TRUE);
587 }
588
589 static void
nfsauth_refresh_thread(void)590 nfsauth_refresh_thread(void)
591 {
592 refreshq_exi_node_t *ren;
593 refreshq_auth_node_t *ran;
594
595 struct exportinfo *exi;
596
597 int access;
598 bool_t retrieval;
599
600 callb_cpr_t cprinfo;
601
602 CALLB_CPR_INIT(&cprinfo, &refreshq_lock, callb_generic_cpr,
603 "nfsauth_refresh");
604
605 for (;;) {
606 mutex_enter(&refreshq_lock);
607 if (refreshq_thread_state != REFRESHQ_THREAD_RUNNING) {
608 /* Keep the hold on the lock! */
609 break;
610 }
611
612 ren = list_remove_head(&refreshq_queue);
613 if (ren == NULL) {
614 CALLB_CPR_SAFE_BEGIN(&cprinfo);
615 cv_wait(&refreshq_cv, &refreshq_lock);
616 CALLB_CPR_SAFE_END(&cprinfo, &refreshq_lock);
617 mutex_exit(&refreshq_lock);
618 continue;
619 }
620 mutex_exit(&refreshq_lock);
621
622 exi = ren->ren_exi;
623 ASSERT(exi != NULL);
624
625 /*
626 * Since the ren was removed from the refreshq_queue above,
627 * this is the only thread aware about the ren existence, so we
628 * have the exclusive ownership of it and we do not need to
629 * protect it by any lock.
630 */
631 while ((ran = list_remove_head(&ren->ren_authlist))) {
632 uid_t uid;
633 gid_t gid;
634 uint_t ngids;
635 gid_t *gids;
636 struct auth_cache *p = ran->ran_auth;
637 char *netid = ran->ran_netid;
638
639 ASSERT(p != NULL);
640 ASSERT(netid != NULL);
641
642 kmem_free(ran, sizeof (refreshq_auth_node_t));
643
644 mutex_enter(&p->auth_lock);
645
646 /*
647 * Once the entry goes INVALID, it can not change
648 * state.
649 *
650 * No need to refresh entries also in a case we are
651 * just shutting down.
652 *
653 * In general, there is no need to hold the
654 * refreshq_lock to test the refreshq_thread_state. We
655 * do hold it at other places because there is some
656 * related thread synchronization (or some other tasks)
657 * close to the refreshq_thread_state check.
658 *
659 * The check for the refreshq_thread_state value here
660 * is purely advisory to allow the faster
661 * nfsauth_refresh_thread() shutdown. In a case we
662 * will miss such advisory, nothing catastrophic
663 * happens: we will just spin longer here before the
664 * shutdown.
665 */
666 if (p->auth_state == NFS_AUTH_INVALID ||
667 refreshq_thread_state != REFRESHQ_THREAD_RUNNING) {
668 mutex_exit(&p->auth_lock);
669
670 if (p->auth_state == NFS_AUTH_INVALID)
671 nfsauth_free_node(p);
672
673 strfree(netid);
674
675 continue;
676 }
677
678 /*
679 * Make sure the state is valid. Note that once we
680 * change the state to NFS_AUTH_REFRESHING, no other
681 * thread will be able to work on this entry.
682 */
683 ASSERT(p->auth_state == NFS_AUTH_STALE);
684
685 p->auth_state = NFS_AUTH_REFRESHING;
686 mutex_exit(&p->auth_lock);
687
688 DTRACE_PROBE2(nfsauth__debug__cache__refresh,
689 struct exportinfo *, exi,
690 struct auth_cache *, p);
691
692 /*
693 * The first caching of the access rights
694 * is done with the netid pulled out of the
695 * request from the client. All subsequent
696 * users of the cache may or may not have
697 * the same netid. It doesn't matter. So
698 * when we refresh, we simply use the netid
699 * of the request which triggered the
700 * refresh attempt.
701 */
702 retrieval = nfsauth_retrieve(exi, netid,
703 p->auth_flavor, &p->auth_clnt->authc_addr, &access,
704 p->auth_clnt_uid, p->auth_clnt_gid,
705 p->auth_clnt_ngids, p->auth_clnt_gids, &uid, &gid,
706 &ngids, &gids);
707
708 /*
709 * This can only be set in one other place
710 * and the state has to be NFS_AUTH_FRESH.
711 */
712 strfree(netid);
713
714 mutex_enter(&p->auth_lock);
715 if (p->auth_state == NFS_AUTH_INVALID) {
716 mutex_exit(&p->auth_lock);
717 nfsauth_free_node(p);
718 if (retrieval == TRUE)
719 kmem_free(gids, ngids * sizeof (gid_t));
720 } else {
721 /*
722 * If we got an error, do not reset the
723 * time. This will cause the next access
724 * check for the client to reschedule this
725 * node.
726 */
727 if (retrieval == TRUE) {
728 p->auth_access = access;
729
730 p->auth_srv_uid = uid;
731 p->auth_srv_gid = gid;
732 kmem_free(p->auth_srv_gids,
733 p->auth_srv_ngids * sizeof (gid_t));
734 p->auth_srv_ngids = ngids;
735 p->auth_srv_gids = gids;
736
737 p->auth_freshness = gethrestime_sec();
738 }
739 p->auth_state = NFS_AUTH_FRESH;
740
741 cv_broadcast(&p->auth_cv);
742 mutex_exit(&p->auth_lock);
743 }
744 }
745
746 list_destroy(&ren->ren_authlist);
747 exi_rele(ren->ren_exi);
748 kmem_free(ren, sizeof (refreshq_exi_node_t));
749 }
750
751 refreshq_thread_state = REFRESHQ_THREAD_HALTED;
752 cv_broadcast(&refreshq_cv);
753 CALLB_CPR_EXIT(&cprinfo);
754 zthread_exit();
755 }
756
757 int
nfsauth_cache_clnt_compar(const void * v1,const void * v2)758 nfsauth_cache_clnt_compar(const void *v1, const void *v2)
759 {
760 int c;
761
762 const struct auth_cache_clnt *a1 = (const struct auth_cache_clnt *)v1;
763 const struct auth_cache_clnt *a2 = (const struct auth_cache_clnt *)v2;
764
765 if (a1->authc_addr.len < a2->authc_addr.len)
766 return (-1);
767 if (a1->authc_addr.len > a2->authc_addr.len)
768 return (1);
769
770 c = memcmp(a1->authc_addr.buf, a2->authc_addr.buf, a1->authc_addr.len);
771 if (c < 0)
772 return (-1);
773 if (c > 0)
774 return (1);
775
776 return (0);
777 }
778
779 static int
nfsauth_cache_compar(const void * v1,const void * v2)780 nfsauth_cache_compar(const void *v1, const void *v2)
781 {
782 const struct auth_cache *a1 = (const struct auth_cache *)v1;
783 const struct auth_cache *a2 = (const struct auth_cache *)v2;
784
785 if (a1->auth_flavor < a2->auth_flavor)
786 return (-1);
787 if (a1->auth_flavor > a2->auth_flavor)
788 return (1);
789
790 if (a1->auth_clnt_uid < a2->auth_clnt_uid)
791 return (-1);
792 if (a1->auth_clnt_uid > a2->auth_clnt_uid)
793 return (1);
794
795 if (a1->auth_clnt_gid < a2->auth_clnt_gid)
796 return (-1);
797 if (a1->auth_clnt_gid > a2->auth_clnt_gid)
798 return (1);
799
800 return (0);
801 }
802
803 /*
804 * Get the access information from the cache or callup to the mountd
805 * to get and cache the access information in the kernel.
806 */
807 static int
nfsauth_cache_get(struct exportinfo * exi,struct svc_req * req,int flavor,cred_t * cr,uid_t * uid,gid_t * gid,uint_t * ngids,gid_t ** gids)808 nfsauth_cache_get(struct exportinfo *exi, struct svc_req *req, int flavor,
809 cred_t *cr, uid_t *uid, gid_t *gid, uint_t *ngids, gid_t **gids)
810 {
811 struct netbuf *taddrmask;
812 struct netbuf addr; /* temporary copy of client's address */
813 const struct netbuf *claddr;
814 avl_tree_t *tree;
815 struct auth_cache ac; /* used as a template for avl_find() */
816 struct auth_cache_clnt *c;
817 struct auth_cache_clnt acc; /* used as a template for avl_find() */
818 struct auth_cache *p = NULL;
819 int access;
820
821 uid_t tmpuid;
822 gid_t tmpgid;
823 uint_t tmpngids;
824 gid_t *tmpgids;
825
826 avl_index_t where; /* used for avl_find()/avl_insert() */
827
828 ASSERT(cr != NULL);
829
830 /*
831 * Now check whether this client already
832 * has an entry for this flavor in the cache
833 * for this export.
834 * Get the caller's address, mask off the
835 * parts of the address that do not identify
836 * the host (port number, etc), and then hash
837 * it to find the chain of cache entries.
838 */
839
840 claddr = svc_getrpccaller(req->rq_xprt);
841 addr = *claddr;
842 addr.buf = kmem_alloc(addr.len, KM_SLEEP);
843 bcopy(claddr->buf, addr.buf, claddr->len);
844
845 SVC_GETADDRMASK(req->rq_xprt, SVC_TATTR_ADDRMASK, (void **)&taddrmask);
846 ASSERT(taddrmask != NULL);
847 addrmask(&addr, taddrmask);
848
849 ac.auth_flavor = flavor;
850 ac.auth_clnt_uid = crgetuid(cr);
851 ac.auth_clnt_gid = crgetgid(cr);
852
853 acc.authc_addr = addr;
854
855 tree = exi->exi_cache[hash(&addr)];
856
857 rw_enter(&exi->exi_cache_lock, RW_READER);
858 c = (struct auth_cache_clnt *)avl_find(tree, &acc, NULL);
859
860 if (c == NULL) {
861 struct auth_cache_clnt *nc;
862
863 rw_exit(&exi->exi_cache_lock);
864
865 nc = kmem_alloc(sizeof (*nc), KM_NOSLEEP | KM_NORMALPRI);
866 if (nc == NULL)
867 goto retrieve;
868
869 /*
870 * Initialize the new auth_cache_clnt
871 */
872 nc->authc_addr = addr;
873 nc->authc_addr.buf = kmem_alloc(addr.len,
874 KM_NOSLEEP | KM_NORMALPRI);
875 if (addr.len != 0 && nc->authc_addr.buf == NULL) {
876 kmem_free(nc, sizeof (*nc));
877 goto retrieve;
878 }
879 bcopy(addr.buf, nc->authc_addr.buf, addr.len);
880 rw_init(&nc->authc_lock, NULL, RW_DEFAULT, NULL);
881 avl_create(&nc->authc_tree, nfsauth_cache_compar,
882 sizeof (struct auth_cache),
883 offsetof(struct auth_cache, auth_link));
884
885 rw_enter(&exi->exi_cache_lock, RW_WRITER);
886 c = (struct auth_cache_clnt *)avl_find(tree, &acc, &where);
887 if (c == NULL) {
888 avl_insert(tree, nc, where);
889 rw_downgrade(&exi->exi_cache_lock);
890 c = nc;
891 } else {
892 rw_downgrade(&exi->exi_cache_lock);
893
894 avl_destroy(&nc->authc_tree);
895 rw_destroy(&nc->authc_lock);
896 kmem_free(nc->authc_addr.buf, nc->authc_addr.len);
897 kmem_free(nc, sizeof (*nc));
898 }
899 }
900
901 ASSERT(c != NULL);
902
903 rw_enter(&c->authc_lock, RW_READER);
904 p = (struct auth_cache *)avl_find(&c->authc_tree, &ac, NULL);
905
906 if (p == NULL) {
907 struct auth_cache *np;
908
909 rw_exit(&c->authc_lock);
910
911 np = kmem_cache_alloc(exi_cache_handle,
912 KM_NOSLEEP | KM_NORMALPRI);
913 if (np == NULL) {
914 rw_exit(&exi->exi_cache_lock);
915 goto retrieve;
916 }
917
918 /*
919 * Initialize the new auth_cache
920 */
921 np->auth_clnt = c;
922 np->auth_flavor = flavor;
923 np->auth_clnt_uid = crgetuid(cr);
924 np->auth_clnt_gid = crgetgid(cr);
925 np->auth_clnt_ngids = 0;
926 np->auth_clnt_gids = NULL;
927 np->auth_srv_ngids = 0;
928 np->auth_srv_gids = NULL;
929 np->auth_time = np->auth_freshness = gethrestime_sec();
930 np->auth_state = NFS_AUTH_NEW;
931 mutex_init(&np->auth_lock, NULL, MUTEX_DEFAULT, NULL);
932 cv_init(&np->auth_cv, NULL, CV_DEFAULT, NULL);
933
934 rw_enter(&c->authc_lock, RW_WRITER);
935 rw_exit(&exi->exi_cache_lock);
936
937 p = (struct auth_cache *)avl_find(&c->authc_tree, &ac, &where);
938 if (p == NULL) {
939 avl_insert(&c->authc_tree, np, where);
940 rw_downgrade(&c->authc_lock);
941 p = np;
942 } else {
943 rw_downgrade(&c->authc_lock);
944
945 cv_destroy(&np->auth_cv);
946 mutex_destroy(&np->auth_lock);
947 kmem_cache_free(exi_cache_handle, np);
948 }
949 } else {
950 rw_exit(&exi->exi_cache_lock);
951 }
952
953 mutex_enter(&p->auth_lock);
954 rw_exit(&c->authc_lock);
955
956 wait:
957 /*
958 * If the entry is in the WAITING state then some other thread is just
959 * retrieving the required info. The entry was either NEW, or the list
960 * of client's supplemental groups is going to be changed (either by
961 * this thread, or by some other thread). We need to wait until the
962 * nfsauth_retrieve() is done.
963 */
964 while (p->auth_state == NFS_AUTH_WAITING)
965 cv_wait(&p->auth_cv, &p->auth_lock);
966
967 /*
968 * Here the entry cannot be in WAITING or INVALID state.
969 */
970 ASSERT(p->auth_state != NFS_AUTH_WAITING);
971 ASSERT(p->auth_state != NFS_AUTH_INVALID);
972
973 /*
974 * In a case the client's list of supplemental groups changed (or, the
975 * list is not initialized yet) we need to (re)allocate it and make
976 * sure the auth_cache entry is (re)retrieved.
977 */
978 if (p->auth_clnt_ngids != crgetngroups(cr) ||
979 bcmp(p->auth_clnt_gids, crgetgroups(cr),
980 p->auth_clnt_ngids * sizeof (gid_t)) != 0) {
981
982 /*
983 * If the refresh thread is just working on this entry then
984 * wait for it so we do not modify the list of supplemental
985 * groups in the middle of its processing.
986 */
987 if (p->auth_state == NFS_AUTH_REFRESHING) {
988 p->auth_state = NFS_AUTH_WAITING;
989 goto wait;
990 }
991
992 /*
993 * We won't modify (and use) the STALE entries here since they
994 * are already in the refreshq_queue list. Such entries will
995 * be updated later.
996 */
997 if (p->auth_state == NFS_AUTH_STALE) {
998 mutex_exit(&p->auth_lock);
999
1000 p = NULL;
1001
1002 goto retrieve;
1003 }
1004
1005 p->auth_state = NFS_AUTH_NEW;
1006
1007 /*
1008 * If the number of supplemental groups differ, we need to
1009 * reallocate first.
1010 */
1011 if (p->auth_clnt_ngids != crgetngroups(cr)) {
1012 kmem_free(p->auth_clnt_gids,
1013 p->auth_clnt_ngids * sizeof (gid_t));
1014
1015 p->auth_clnt_ngids = crgetngroups(cr);
1016 p->auth_clnt_gids = kmem_alloc(
1017 p->auth_clnt_ngids * sizeof (gid_t),
1018 KM_NOSLEEP | KM_NORMALPRI);
1019
1020 /*
1021 * If we failed to preallocate the memory for
1022 * supplemental groups, we won't cache the retrieved
1023 * data.
1024 */
1025 if (p->auth_clnt_ngids != 0 &&
1026 p->auth_clnt_gids == NULL)
1027 p->auth_clnt_ngids = 0;
1028 mutex_exit(&p->auth_lock);
1029
1030 p = NULL;
1031
1032 goto retrieve;
1033 }
1034
1035 /*
1036 * Fill the client's supplemental groups.
1037 */
1038 bcopy(crgetgroups(cr), p->auth_clnt_gids,
1039 p->auth_clnt_ngids * sizeof (gid_t));
1040 }
1041
1042 /*
1043 * If the cache entry is not valid yet, we need to retrieve the
1044 * info ourselves.
1045 */
1046 if (p->auth_state == NFS_AUTH_NEW) {
1047 bool_t res;
1048 /*
1049 * NFS_AUTH_NEW is the default output auth_state value in a
1050 * case we failed somewhere below.
1051 */
1052 auth_state_t state = NFS_AUTH_NEW;
1053
1054 p->auth_state = NFS_AUTH_WAITING;
1055 mutex_exit(&p->auth_lock);
1056 kmem_free(addr.buf, addr.len);
1057 addr = p->auth_clnt->authc_addr;
1058
1059 atomic_inc_uint(&nfsauth_cache_miss);
1060
1061 res = nfsauth_retrieve(exi, svc_getnetid(req->rq_xprt), flavor,
1062 &addr, &access, crgetuid(cr), crgetgid(cr),
1063 crgetngroups(cr), crgetgroups(cr), &tmpuid, &tmpgid,
1064 &tmpngids, &tmpgids);
1065
1066 p->auth_access = access;
1067 p->auth_time = p->auth_freshness = gethrestime_sec();
1068
1069 if (res == TRUE) {
1070 if (uid != NULL)
1071 *uid = tmpuid;
1072 if (gid != NULL)
1073 *gid = tmpgid;
1074 if (ngids != NULL && gids != NULL) {
1075 *ngids = tmpngids;
1076 *gids = tmpgids;
1077
1078 /*
1079 * We need a copy of gids for the
1080 * auth_cache entry
1081 */
1082 tmpgids = kmem_alloc(tmpngids * sizeof (gid_t),
1083 KM_NOSLEEP | KM_NORMALPRI);
1084 if (tmpgids != NULL)
1085 bcopy(*gids, tmpgids,
1086 tmpngids * sizeof (gid_t));
1087 }
1088
1089 if (tmpgids != NULL || tmpngids == 0) {
1090 p->auth_srv_uid = tmpuid;
1091 p->auth_srv_gid = tmpgid;
1092 p->auth_srv_ngids = tmpngids;
1093 p->auth_srv_gids = tmpgids;
1094
1095 state = NFS_AUTH_FRESH;
1096 }
1097 }
1098
1099 /*
1100 * Set the auth_state and notify waiters.
1101 */
1102 mutex_enter(&p->auth_lock);
1103 p->auth_state = state;
1104 cv_broadcast(&p->auth_cv);
1105 mutex_exit(&p->auth_lock);
1106 } else {
1107 uint_t nach;
1108 time_t refresh;
1109
1110 refresh = gethrestime_sec() - p->auth_freshness;
1111
1112 p->auth_time = gethrestime_sec();
1113
1114 if (uid != NULL)
1115 *uid = p->auth_srv_uid;
1116 if (gid != NULL)
1117 *gid = p->auth_srv_gid;
1118 if (ngids != NULL && gids != NULL) {
1119 *ngids = p->auth_srv_ngids;
1120 *gids = kmem_alloc(*ngids * sizeof (gid_t), KM_SLEEP);
1121 bcopy(p->auth_srv_gids, *gids, *ngids * sizeof (gid_t));
1122 }
1123
1124 access = p->auth_access;
1125
1126 if ((refresh > NFSAUTH_CACHE_REFRESH) &&
1127 p->auth_state == NFS_AUTH_FRESH) {
1128 refreshq_auth_node_t *ran;
1129 uint_t nacr;
1130
1131 p->auth_state = NFS_AUTH_STALE;
1132 mutex_exit(&p->auth_lock);
1133
1134 nacr = atomic_inc_uint_nv(&nfsauth_cache_refresh);
1135 DTRACE_PROBE3(nfsauth__debug__cache__stale,
1136 struct exportinfo *, exi,
1137 struct auth_cache *, p,
1138 uint_t, nacr);
1139
1140 ran = kmem_alloc(sizeof (refreshq_auth_node_t),
1141 KM_SLEEP);
1142 ran->ran_auth = p;
1143 ran->ran_netid = strdup(svc_getnetid(req->rq_xprt));
1144
1145 mutex_enter(&refreshq_lock);
1146 /*
1147 * We should not add a work queue
1148 * item if the thread is not
1149 * accepting them.
1150 */
1151 if (refreshq_thread_state == REFRESHQ_THREAD_RUNNING) {
1152 refreshq_exi_node_t *ren;
1153
1154 /*
1155 * Is there an existing exi_list?
1156 */
1157 for (ren = list_head(&refreshq_queue);
1158 ren != NULL;
1159 ren = list_next(&refreshq_queue, ren)) {
1160 if (ren->ren_exi == exi) {
1161 list_insert_tail(
1162 &ren->ren_authlist, ran);
1163 break;
1164 }
1165 }
1166
1167 if (ren == NULL) {
1168 ren = kmem_alloc(
1169 sizeof (refreshq_exi_node_t),
1170 KM_SLEEP);
1171
1172 exi_hold(exi);
1173 ren->ren_exi = exi;
1174
1175 list_create(&ren->ren_authlist,
1176 sizeof (refreshq_auth_node_t),
1177 offsetof(refreshq_auth_node_t,
1178 ran_node));
1179
1180 list_insert_tail(&ren->ren_authlist,
1181 ran);
1182 list_insert_tail(&refreshq_queue, ren);
1183 }
1184
1185 cv_broadcast(&refreshq_cv);
1186 } else {
1187 strfree(ran->ran_netid);
1188 kmem_free(ran, sizeof (refreshq_auth_node_t));
1189 }
1190
1191 mutex_exit(&refreshq_lock);
1192 } else {
1193 mutex_exit(&p->auth_lock);
1194 }
1195
1196 nach = atomic_inc_uint_nv(&nfsauth_cache_hit);
1197 DTRACE_PROBE2(nfsauth__debug__cache__hit,
1198 uint_t, nach,
1199 time_t, refresh);
1200
1201 kmem_free(addr.buf, addr.len);
1202 }
1203
1204 return (access);
1205
1206 retrieve:
1207 /*
1208 * Retrieve the required data without caching.
1209 */
1210
1211 ASSERT(p == NULL);
1212
1213 atomic_inc_uint(&nfsauth_cache_miss);
1214
1215 if (nfsauth_retrieve(exi, svc_getnetid(req->rq_xprt), flavor, &addr,
1216 &access, crgetuid(cr), crgetgid(cr), crgetngroups(cr),
1217 crgetgroups(cr), &tmpuid, &tmpgid, &tmpngids, &tmpgids)) {
1218 if (uid != NULL)
1219 *uid = tmpuid;
1220 if (gid != NULL)
1221 *gid = tmpgid;
1222 if (ngids != NULL && gids != NULL) {
1223 *ngids = tmpngids;
1224 *gids = tmpgids;
1225 } else {
1226 kmem_free(tmpgids, tmpngids * sizeof (gid_t));
1227 }
1228 }
1229
1230 kmem_free(addr.buf, addr.len);
1231
1232 return (access);
1233 }
1234
1235 /*
1236 * Check if the requesting client has access to the filesystem with
1237 * a given nfs flavor number which is an explicitly shared flavor.
1238 */
1239 int
nfsauth4_secinfo_access(struct exportinfo * exi,struct svc_req * req,int flavor,int perm,cred_t * cr)1240 nfsauth4_secinfo_access(struct exportinfo *exi, struct svc_req *req,
1241 int flavor, int perm, cred_t *cr)
1242 {
1243 int access;
1244
1245 if (! (perm & M_4SEC_EXPORTED)) {
1246 return (NFSAUTH_DENIED);
1247 }
1248
1249 /*
1250 * Optimize if there are no lists
1251 */
1252 if ((perm & (M_ROOT | M_NONE | M_MAP)) == 0) {
1253 perm &= ~M_4SEC_EXPORTED;
1254 if (perm == M_RO)
1255 return (NFSAUTH_RO);
1256 if (perm == M_RW)
1257 return (NFSAUTH_RW);
1258 }
1259
1260 access = nfsauth_cache_get(exi, req, flavor, cr, NULL, NULL, NULL,
1261 NULL);
1262
1263 return (access);
1264 }
1265
1266 int
nfsauth_access(struct exportinfo * exi,struct svc_req * req,cred_t * cr,uid_t * uid,gid_t * gid,uint_t * ngids,gid_t ** gids)1267 nfsauth_access(struct exportinfo *exi, struct svc_req *req, cred_t *cr,
1268 uid_t *uid, gid_t *gid, uint_t *ngids, gid_t **gids)
1269 {
1270 int access, mapaccess;
1271 struct secinfo *sp;
1272 int i, flavor, perm;
1273 int authnone_entry = -1;
1274
1275 /*
1276 * By default root is mapped to anonymous user.
1277 * This might get overriden later in nfsauth_cache_get().
1278 */
1279 if (crgetuid(cr) == 0) {
1280 if (uid != NULL)
1281 *uid = exi->exi_export.ex_anon;
1282 if (gid != NULL)
1283 *gid = exi->exi_export.ex_anon;
1284 } else {
1285 if (uid != NULL)
1286 *uid = crgetuid(cr);
1287 if (gid != NULL)
1288 *gid = crgetgid(cr);
1289 }
1290
1291 if (ngids != NULL)
1292 *ngids = 0;
1293 if (gids != NULL)
1294 *gids = NULL;
1295
1296 /*
1297 * Get the nfs flavor number from xprt.
1298 */
1299 flavor = (int)(uintptr_t)req->rq_xprt->xp_cookie;
1300
1301 /*
1302 * First check the access restrictions on the filesystem. If
1303 * there are no lists associated with this flavor then there's no
1304 * need to make an expensive call to the nfsauth service or to
1305 * cache anything.
1306 */
1307
1308 sp = exi->exi_export.ex_secinfo;
1309 for (i = 0; i < exi->exi_export.ex_seccnt; i++) {
1310 if (flavor != sp[i].s_secinfo.sc_nfsnum) {
1311 if (sp[i].s_secinfo.sc_nfsnum == AUTH_NONE)
1312 authnone_entry = i;
1313 continue;
1314 }
1315 break;
1316 }
1317
1318 mapaccess = 0;
1319
1320 if (i >= exi->exi_export.ex_seccnt) {
1321 /*
1322 * Flavor not found, but use AUTH_NONE if it exists
1323 */
1324 if (authnone_entry == -1)
1325 return (NFSAUTH_DENIED);
1326 flavor = AUTH_NONE;
1327 mapaccess = NFSAUTH_MAPNONE;
1328 i = authnone_entry;
1329 }
1330
1331 /*
1332 * If the flavor is in the ex_secinfo list, but not an explicitly
1333 * shared flavor by the user, it is a result of the nfsv4 server
1334 * namespace setup. We will grant an RO permission similar for
1335 * a pseudo node except that this node is a shared one.
1336 *
1337 * e.g. flavor in (flavor) indicates that it is not explictly
1338 * shared by the user:
1339 *
1340 * / (sys, krb5)
1341 * |
1342 * export #share -o sec=sys (krb5)
1343 * |
1344 * secure #share -o sec=krb5
1345 *
1346 * In this case, when a krb5 request coming in to access
1347 * /export, RO permission is granted.
1348 */
1349 if (!(sp[i].s_flags & M_4SEC_EXPORTED))
1350 return (mapaccess | NFSAUTH_RO);
1351
1352 /*
1353 * Optimize if there are no lists.
1354 * We cannot optimize for AUTH_SYS with NGRPS (16) supplemental groups.
1355 */
1356 perm = sp[i].s_flags;
1357 if ((perm & (M_ROOT | M_NONE | M_MAP)) == 0 && (ngroups_max <= NGRPS ||
1358 flavor != AUTH_SYS || crgetngroups(cr) < NGRPS)) {
1359 perm &= ~M_4SEC_EXPORTED;
1360 if (perm == M_RO)
1361 return (mapaccess | NFSAUTH_RO);
1362 if (perm == M_RW)
1363 return (mapaccess | NFSAUTH_RW);
1364 }
1365
1366 access = nfsauth_cache_get(exi, req, flavor, cr, uid, gid, ngids, gids);
1367
1368 /*
1369 * For both NFSAUTH_DENIED and NFSAUTH_WRONGSEC we do not care about
1370 * the supplemental groups.
1371 */
1372 if (access & NFSAUTH_DENIED || access & NFSAUTH_WRONGSEC) {
1373 if (ngids != NULL && gids != NULL) {
1374 kmem_free(*gids, *ngids * sizeof (gid_t));
1375 *ngids = 0;
1376 *gids = NULL;
1377 }
1378 }
1379
1380 /*
1381 * Client's security flavor doesn't match with "ro" or
1382 * "rw" list. Try again using AUTH_NONE if present.
1383 */
1384 if ((access & NFSAUTH_WRONGSEC) && (flavor != AUTH_NONE)) {
1385 /*
1386 * Have we already encountered AUTH_NONE ?
1387 */
1388 if (authnone_entry != -1) {
1389 mapaccess = NFSAUTH_MAPNONE;
1390 access = nfsauth_cache_get(exi, req, AUTH_NONE, cr,
1391 NULL, NULL, NULL, NULL);
1392 } else {
1393 /*
1394 * Check for AUTH_NONE presence.
1395 */
1396 for (; i < exi->exi_export.ex_seccnt; i++) {
1397 if (sp[i].s_secinfo.sc_nfsnum == AUTH_NONE) {
1398 mapaccess = NFSAUTH_MAPNONE;
1399 access = nfsauth_cache_get(exi, req,
1400 AUTH_NONE, cr, NULL, NULL, NULL,
1401 NULL);
1402 break;
1403 }
1404 }
1405 }
1406 }
1407
1408 if (access & NFSAUTH_DENIED)
1409 access = NFSAUTH_DENIED;
1410
1411 return (access | mapaccess);
1412 }
1413
1414 static void
nfsauth_free_clnt_node(struct auth_cache_clnt * p)1415 nfsauth_free_clnt_node(struct auth_cache_clnt *p)
1416 {
1417 void *cookie = NULL;
1418 struct auth_cache *node;
1419
1420 while ((node = avl_destroy_nodes(&p->authc_tree, &cookie)) != NULL)
1421 nfsauth_free_node(node);
1422 avl_destroy(&p->authc_tree);
1423
1424 kmem_free(p->authc_addr.buf, p->authc_addr.len);
1425 rw_destroy(&p->authc_lock);
1426
1427 kmem_free(p, sizeof (*p));
1428 }
1429
1430 static void
nfsauth_free_node(struct auth_cache * p)1431 nfsauth_free_node(struct auth_cache *p)
1432 {
1433 kmem_free(p->auth_clnt_gids, p->auth_clnt_ngids * sizeof (gid_t));
1434 kmem_free(p->auth_srv_gids, p->auth_srv_ngids * sizeof (gid_t));
1435 mutex_destroy(&p->auth_lock);
1436 cv_destroy(&p->auth_cv);
1437 kmem_cache_free(exi_cache_handle, p);
1438 }
1439
1440 /*
1441 * Free the nfsauth cache for a given export
1442 */
1443 void
nfsauth_cache_free(struct exportinfo * exi)1444 nfsauth_cache_free(struct exportinfo *exi)
1445 {
1446 int i;
1447
1448 /*
1449 * The only way we got here was with an exi_rele, which means that no
1450 * auth cache entry is being refreshed.
1451 */
1452
1453 for (i = 0; i < AUTH_TABLESIZE; i++) {
1454 avl_tree_t *tree = exi->exi_cache[i];
1455 void *cookie = NULL;
1456 struct auth_cache_clnt *node;
1457
1458 while ((node = avl_destroy_nodes(tree, &cookie)) != NULL)
1459 nfsauth_free_clnt_node(node);
1460 }
1461 }
1462
1463 /*
1464 * Called by the kernel memory allocator when
1465 * memory is low. Free unused cache entries.
1466 * If that's not enough, the VM system will
1467 * call again for some more.
1468 */
1469 /*ARGSUSED*/
1470 void
exi_cache_reclaim(void * cdrarg)1471 exi_cache_reclaim(void *cdrarg)
1472 {
1473 int i;
1474 struct exportinfo *exi;
1475
1476 rw_enter(&exported_lock, RW_READER);
1477
1478 for (i = 0; i < EXPTABLESIZE; i++) {
1479 for (exi = exptable[i]; exi; exi = exi->fid_hash.next) {
1480 exi_cache_trim(exi);
1481 }
1482 }
1483
1484 rw_exit(&exported_lock);
1485
1486 atomic_inc_uint(&nfsauth_cache_reclaim);
1487 }
1488
1489 void
exi_cache_trim(struct exportinfo * exi)1490 exi_cache_trim(struct exportinfo *exi)
1491 {
1492 struct auth_cache_clnt *c;
1493 struct auth_cache_clnt *nextc;
1494 struct auth_cache *p;
1495 struct auth_cache *next;
1496 int i;
1497 time_t stale_time;
1498 avl_tree_t *tree;
1499
1500 for (i = 0; i < AUTH_TABLESIZE; i++) {
1501
1502 tree = exi->exi_cache[i];
1503 stale_time = gethrestime_sec() - NFSAUTH_CACHE_TRIM;
1504
1505 rw_enter(&exi->exi_cache_lock, RW_READER);
1506
1507 /*
1508 * Free entries that have not been
1509 * used for NFSAUTH_CACHE_TRIM seconds.
1510 */
1511 for (c = avl_first(tree); c != NULL; c = AVL_NEXT(tree, c)) {
1512 rw_enter(&c->authc_lock, RW_WRITER);
1513 for (p = avl_first(&c->authc_tree); p != NULL;
1514 p = next) {
1515 next = AVL_NEXT(&c->authc_tree, p);
1516
1517 ASSERT(p->auth_state != NFS_AUTH_INVALID);
1518
1519 mutex_enter(&p->auth_lock);
1520
1521 /*
1522 * We won't trim recently used and/or WAITING
1523 * entries.
1524 */
1525 if (p->auth_time > stale_time ||
1526 p->auth_state == NFS_AUTH_WAITING) {
1527 mutex_exit(&p->auth_lock);
1528 continue;
1529 }
1530
1531 DTRACE_PROBE1(nfsauth__debug__trim__state,
1532 auth_state_t, p->auth_state);
1533
1534 /*
1535 * STALE and REFRESHING entries needs to be
1536 * marked INVALID only because they are
1537 * referenced by some other structures or
1538 * threads. They will be freed later.
1539 */
1540 if (p->auth_state == NFS_AUTH_STALE ||
1541 p->auth_state == NFS_AUTH_REFRESHING) {
1542 p->auth_state = NFS_AUTH_INVALID;
1543 mutex_exit(&p->auth_lock);
1544
1545 avl_remove(&c->authc_tree, p);
1546 } else {
1547 mutex_exit(&p->auth_lock);
1548
1549 avl_remove(&c->authc_tree, p);
1550 nfsauth_free_node(p);
1551 }
1552 }
1553 rw_exit(&c->authc_lock);
1554 }
1555
1556 if (rw_tryupgrade(&exi->exi_cache_lock) == 0) {
1557 rw_exit(&exi->exi_cache_lock);
1558 rw_enter(&exi->exi_cache_lock, RW_WRITER);
1559 }
1560
1561 for (c = avl_first(tree); c != NULL; c = nextc) {
1562 nextc = AVL_NEXT(tree, c);
1563
1564 if (avl_is_empty(&c->authc_tree) == B_FALSE)
1565 continue;
1566
1567 avl_remove(tree, c);
1568
1569 nfsauth_free_clnt_node(c);
1570 }
1571
1572 rw_exit(&exi->exi_cache_lock);
1573 }
1574 }
1575