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SUNRPC: rework cache upcall logic
[linux-2.6/libata-dev.git] / net / sunrpc / svcauth_unix.c
blob5085804ec8a7360952d25c19e231eef4fca78df3
1 #include <linux/types.h>
2 #include <linux/sched.h>
3 #include <linux/module.h>
4 #include <linux/sunrpc/types.h>
5 #include <linux/sunrpc/xdr.h>
6 #include <linux/sunrpc/svcsock.h>
7 #include <linux/sunrpc/svcauth.h>
8 #include <linux/sunrpc/gss_api.h>
9 #include <linux/sunrpc/addr.h>
10 #include <linux/err.h>
11 #include <linux/seq_file.h>
12 #include <linux/hash.h>
13 #include <linux/string.h>
14 #include <linux/slab.h>
15 #include <net/sock.h>
16 #include <net/ipv6.h>
17 #include <linux/kernel.h>
18 #include <linux/user_namespace.h>
19 #define RPCDBG_FACILITY RPCDBG_AUTH
20
21
22 #include "netns.h"
23
24 /*
25 * AUTHUNIX and AUTHNULL credentials are both handled here.
26 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
27 * are always nobody (-2). i.e. we do the same IP address checks for
28 * AUTHNULL as for AUTHUNIX, and that is done here.
29 */
30
31
32 struct unix_domain {
33 struct auth_domain h;
34 /* other stuff later */
35 };
36
37 extern struct auth_ops svcauth_null;
38 extern struct auth_ops svcauth_unix;
39
40 static void svcauth_unix_domain_release(struct auth_domain *dom)
41 {
42 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
43
44 kfree(dom->name);
45 kfree(ud);
46 }
47
48 struct auth_domain *unix_domain_find(char *name)
49 {
50 struct auth_domain *rv;
51 struct unix_domain *new = NULL;
52
53 rv = auth_domain_lookup(name, NULL);
54 while(1) {
55 if (rv) {
56 if (new && rv != &new->h)
57 svcauth_unix_domain_release(&new->h);
58
59 if (rv->flavour != &svcauth_unix) {
60 auth_domain_put(rv);
61 return NULL;
62 }
63 return rv;
64 }
65
66 new = kmalloc(sizeof(*new), GFP_KERNEL);
67 if (new == NULL)
68 return NULL;
69 kref_init(&new->h.ref);
70 new->h.name = kstrdup(name, GFP_KERNEL);
71 if (new->h.name == NULL) {
72 kfree(new);
73 return NULL;
74 }
75 new->h.flavour = &svcauth_unix;
76 rv = auth_domain_lookup(name, &new->h);
77 }
78 }
79 EXPORT_SYMBOL_GPL(unix_domain_find);
80
81
82 /**************************************************
83 * cache for IP address to unix_domain
84 * as needed by AUTH_UNIX
85 */
86 #define IP_HASHBITS 8
87 #define IP_HASHMAX (1<<IP_HASHBITS)
88
89 struct ip_map {
90 struct cache_head h;
91 char m_class[8]; /* e.g. "nfsd" */
92 struct in6_addr m_addr;
93 struct unix_domain *m_client;
94 };
95
96 static void ip_map_put(struct kref *kref)
97 {
98 struct cache_head *item = container_of(kref, struct cache_head, ref);
99 struct ip_map *im = container_of(item, struct ip_map,h);
100
101 if (test_bit(CACHE_VALID, &item->flags) &&
102 !test_bit(CACHE_NEGATIVE, &item->flags))
103 auth_domain_put(&im->m_client->h);
104 kfree(im);
105 }
106
107 static inline int hash_ip6(const struct in6_addr *ip)
108 {
109 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
110 }
111 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
112 {
113 struct ip_map *orig = container_of(corig, struct ip_map, h);
114 struct ip_map *new = container_of(cnew, struct ip_map, h);
115 return strcmp(orig->m_class, new->m_class) == 0 &&
116 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
117 }
118 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
119 {
120 struct ip_map *new = container_of(cnew, struct ip_map, h);
121 struct ip_map *item = container_of(citem, struct ip_map, h);
122
123 strcpy(new->m_class, item->m_class);
124 new->m_addr = item->m_addr;
125 }
126 static void update(struct cache_head *cnew, struct cache_head *citem)
127 {
128 struct ip_map *new = container_of(cnew, struct ip_map, h);
129 struct ip_map *item = container_of(citem, struct ip_map, h);
130
131 kref_get(&item->m_client->h.ref);
132 new->m_client = item->m_client;
133 }
134 static struct cache_head *ip_map_alloc(void)
135 {
136 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
137 if (i)
138 return &i->h;
139 else
140 return NULL;
141 }
142
143 static void ip_map_request(struct cache_detail *cd,
144 struct cache_head *h,
145 char **bpp, int *blen)
146 {
147 char text_addr[40];
148 struct ip_map *im = container_of(h, struct ip_map, h);
149
150 if (ipv6_addr_v4mapped(&(im->m_addr))) {
151 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
152 } else {
153 snprintf(text_addr, 40, "%pI6", &im->m_addr);
154 }
155 qword_add(bpp, blen, im->m_class);
156 qword_add(bpp, blen, text_addr);
157 (*bpp)[-1] = '\n';
158 }
159
160 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
161 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
162
163 static int ip_map_parse(struct cache_detail *cd,
164 char *mesg, int mlen)
165 {
166 /* class ipaddress [domainname] */
167 /* should be safe just to use the start of the input buffer
168 * for scratch: */
169 char *buf = mesg;
170 int len;
171 char class[8];
172 union {
173 struct sockaddr sa;
174 struct sockaddr_in s4;
175 struct sockaddr_in6 s6;
176 } address;
177 struct sockaddr_in6 sin6;
178 int err;
179
180 struct ip_map *ipmp;
181 struct auth_domain *dom;
182 time_t expiry;
183
184 if (mesg[mlen-1] != '\n')
185 return -EINVAL;
186 mesg[mlen-1] = 0;
187
188 /* class */
189 len = qword_get(&mesg, class, sizeof(class));
190 if (len <= 0) return -EINVAL;
191
192 /* ip address */
193 len = qword_get(&mesg, buf, mlen);
194 if (len <= 0) return -EINVAL;
195
196 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
197 return -EINVAL;
198 switch (address.sa.sa_family) {
199 case AF_INET:
200 /* Form a mapped IPv4 address in sin6 */
201 sin6.sin6_family = AF_INET6;
202 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
203 &sin6.sin6_addr);
204 break;
205 #if IS_ENABLED(CONFIG_IPV6)
206 case AF_INET6:
207 memcpy(&sin6, &address.s6, sizeof(sin6));
208 break;
209 #endif
210 default:
211 return -EINVAL;
212 }
213
214 expiry = get_expiry(&mesg);
215 if (expiry ==0)
216 return -EINVAL;
217
218 /* domainname, or empty for NEGATIVE */
219 len = qword_get(&mesg, buf, mlen);
220 if (len < 0) return -EINVAL;
221
222 if (len) {
223 dom = unix_domain_find(buf);
224 if (dom == NULL)
225 return -ENOENT;
226 } else
227 dom = NULL;
228
229 /* IPv6 scope IDs are ignored for now */
230 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
231 if (ipmp) {
232 err = __ip_map_update(cd, ipmp,
233 container_of(dom, struct unix_domain, h),
234 expiry);
235 } else
236 err = -ENOMEM;
237
238 if (dom)
239 auth_domain_put(dom);
240
241 cache_flush();
242 return err;
243 }
244
245 static int ip_map_show(struct seq_file *m,
246 struct cache_detail *cd,
247 struct cache_head *h)
248 {
249 struct ip_map *im;
250 struct in6_addr addr;
251 char *dom = "-no-domain-";
252
253 if (h == NULL) {
254 seq_puts(m, "#class IP domain\n");
255 return 0;
256 }
257 im = container_of(h, struct ip_map, h);
258 /* class addr domain */
259 addr = im->m_addr;
260
261 if (test_bit(CACHE_VALID, &h->flags) &&
262 !test_bit(CACHE_NEGATIVE, &h->flags))
263 dom = im->m_client->h.name;
264
265 if (ipv6_addr_v4mapped(&addr)) {
266 seq_printf(m, "%s %pI4 %s\n",
267 im->m_class, &addr.s6_addr32[3], dom);
268 } else {
269 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
270 }
271 return 0;
272 }
273
274
275 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
276 struct in6_addr *addr)
277 {
278 struct ip_map ip;
279 struct cache_head *ch;
280
281 strcpy(ip.m_class, class);
282 ip.m_addr = *addr;
283 ch = sunrpc_cache_lookup(cd, &ip.h,
284 hash_str(class, IP_HASHBITS) ^
285 hash_ip6(addr));
286
287 if (ch)
288 return container_of(ch, struct ip_map, h);
289 else
290 return NULL;
291 }
292
293 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
294 struct in6_addr *addr)
295 {
296 struct sunrpc_net *sn;
297
298 sn = net_generic(net, sunrpc_net_id);
299 return __ip_map_lookup(sn->ip_map_cache, class, addr);
300 }
301
302 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
303 struct unix_domain *udom, time_t expiry)
304 {
305 struct ip_map ip;
306 struct cache_head *ch;
307
308 ip.m_client = udom;
309 ip.h.flags = 0;
310 if (!udom)
311 set_bit(CACHE_NEGATIVE, &ip.h.flags);
312 ip.h.expiry_time = expiry;
313 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
314 hash_str(ipm->m_class, IP_HASHBITS) ^
315 hash_ip6(&ipm->m_addr));
316 if (!ch)
317 return -ENOMEM;
318 cache_put(ch, cd);
319 return 0;
320 }
321
322 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
323 struct unix_domain *udom, time_t expiry)
324 {
325 struct sunrpc_net *sn;
326
327 sn = net_generic(net, sunrpc_net_id);
328 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
329 }
330
331 void svcauth_unix_purge(struct net *net)
332 {
333 struct sunrpc_net *sn;
334
335 sn = net_generic(net, sunrpc_net_id);
336 cache_purge(sn->ip_map_cache);
337 }
338 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
339
340 static inline struct ip_map *
341 ip_map_cached_get(struct svc_xprt *xprt)
342 {
343 struct ip_map *ipm = NULL;
344 struct sunrpc_net *sn;
345
346 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
347 spin_lock(&xprt->xpt_lock);
348 ipm = xprt->xpt_auth_cache;
349 if (ipm != NULL) {
350 if (!cache_valid(&ipm->h)) {
351 /*
352 * The entry has been invalidated since it was
353 * remembered, e.g. by a second mount from the
354 * same IP address.
355 */
356 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
357 xprt->xpt_auth_cache = NULL;
358 spin_unlock(&xprt->xpt_lock);
359 cache_put(&ipm->h, sn->ip_map_cache);
360 return NULL;
361 }
362 cache_get(&ipm->h);
363 }
364 spin_unlock(&xprt->xpt_lock);
365 }
366 return ipm;
367 }
368
369 static inline void
370 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
371 {
372 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
373 spin_lock(&xprt->xpt_lock);
374 if (xprt->xpt_auth_cache == NULL) {
375 /* newly cached, keep the reference */
376 xprt->xpt_auth_cache = ipm;
377 ipm = NULL;
378 }
379 spin_unlock(&xprt->xpt_lock);
380 }
381 if (ipm) {
382 struct sunrpc_net *sn;
383
384 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
385 cache_put(&ipm->h, sn->ip_map_cache);
386 }
387 }
388
389 void
390 svcauth_unix_info_release(struct svc_xprt *xpt)
391 {
392 struct ip_map *ipm;
393
394 ipm = xpt->xpt_auth_cache;
395 if (ipm != NULL) {
396 struct sunrpc_net *sn;
397
398 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
399 cache_put(&ipm->h, sn->ip_map_cache);
400 }
401 }
402
403 /****************************************************************************
404 * auth.unix.gid cache
405 * simple cache to map a UID to a list of GIDs
406 * because AUTH_UNIX aka AUTH_SYS has a max of 16
407 */
408 #define GID_HASHBITS 8
409 #define GID_HASHMAX (1<<GID_HASHBITS)
410
411 struct unix_gid {
412 struct cache_head h;
413 uid_t uid;
414 struct group_info *gi;
415 };
416
417 static void unix_gid_put(struct kref *kref)
418 {
419 struct cache_head *item = container_of(kref, struct cache_head, ref);
420 struct unix_gid *ug = container_of(item, struct unix_gid, h);
421 if (test_bit(CACHE_VALID, &item->flags) &&
422 !test_bit(CACHE_NEGATIVE, &item->flags))
423 put_group_info(ug->gi);
424 kfree(ug);
425 }
426
427 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
428 {
429 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
430 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
431 return orig->uid == new->uid;
432 }
433 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
434 {
435 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
436 struct unix_gid *item = container_of(citem, struct unix_gid, h);
437 new->uid = item->uid;
438 }
439 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
440 {
441 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
442 struct unix_gid *item = container_of(citem, struct unix_gid, h);
443
444 get_group_info(item->gi);
445 new->gi = item->gi;
446 }
447 static struct cache_head *unix_gid_alloc(void)
448 {
449 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
450 if (g)
451 return &g->h;
452 else
453 return NULL;
454 }
455
456 static void unix_gid_request(struct cache_detail *cd,
457 struct cache_head *h,
458 char **bpp, int *blen)
459 {
460 char tuid[20];
461 struct unix_gid *ug = container_of(h, struct unix_gid, h);
462
463 snprintf(tuid, 20, "%u", ug->uid);
464 qword_add(bpp, blen, tuid);
465 (*bpp)[-1] = '\n';
466 }
467
468 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid);
469
470 static int unix_gid_parse(struct cache_detail *cd,
471 char *mesg, int mlen)
472 {
473 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
474 int uid;
475 int gids;
476 int rv;
477 int i;
478 int err;
479 time_t expiry;
480 struct unix_gid ug, *ugp;
481
482 if (mesg[mlen - 1] != '\n')
483 return -EINVAL;
484 mesg[mlen-1] = 0;
485
486 rv = get_int(&mesg, &uid);
487 if (rv)
488 return -EINVAL;
489 ug.uid = uid;
490
491 expiry = get_expiry(&mesg);
492 if (expiry == 0)
493 return -EINVAL;
494
495 rv = get_int(&mesg, &gids);
496 if (rv || gids < 0 || gids > 8192)
497 return -EINVAL;
498
499 ug.gi = groups_alloc(gids);
500 if (!ug.gi)
501 return -ENOMEM;
502
503 for (i = 0 ; i < gids ; i++) {
504 int gid;
505 kgid_t kgid;
506 rv = get_int(&mesg, &gid);
507 err = -EINVAL;
508 if (rv)
509 goto out;
510 kgid = make_kgid(&init_user_ns, gid);
511 if (!gid_valid(kgid))
512 goto out;
513 GROUP_AT(ug.gi, i) = kgid;
514 }
515
516 ugp = unix_gid_lookup(cd, uid);
517 if (ugp) {
518 struct cache_head *ch;
519 ug.h.flags = 0;
520 ug.h.expiry_time = expiry;
521 ch = sunrpc_cache_update(cd,
522 &ug.h, &ugp->h,
523 hash_long(uid, GID_HASHBITS));
524 if (!ch)
525 err = -ENOMEM;
526 else {
527 err = 0;
528 cache_put(ch, cd);
529 }
530 } else
531 err = -ENOMEM;
532 out:
533 if (ug.gi)
534 put_group_info(ug.gi);
535 return err;
536 }
537
538 static int unix_gid_show(struct seq_file *m,
539 struct cache_detail *cd,
540 struct cache_head *h)
541 {
542 struct user_namespace *user_ns = current_user_ns();
543 struct unix_gid *ug;
544 int i;
545 int glen;
546
547 if (h == NULL) {
548 seq_puts(m, "#uid cnt: gids...\n");
549 return 0;
550 }
551 ug = container_of(h, struct unix_gid, h);
552 if (test_bit(CACHE_VALID, &h->flags) &&
553 !test_bit(CACHE_NEGATIVE, &h->flags))
554 glen = ug->gi->ngroups;
555 else
556 glen = 0;
557
558 seq_printf(m, "%u %d:", ug->uid, glen);
559 for (i = 0; i < glen; i++)
560 seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
561 seq_printf(m, "\n");
562 return 0;
563 }
564
565 static struct cache_detail unix_gid_cache_template = {
566 .owner = THIS_MODULE,
567 .hash_size = GID_HASHMAX,
568 .name = "auth.unix.gid",
569 .cache_put = unix_gid_put,
570 .cache_request = unix_gid_request,
571 .cache_parse = unix_gid_parse,
572 .cache_show = unix_gid_show,
573 .match = unix_gid_match,
574 .init = unix_gid_init,
575 .update = unix_gid_update,
576 .alloc = unix_gid_alloc,
577 };
578
579 int unix_gid_cache_create(struct net *net)
580 {
581 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
582 struct cache_detail *cd;
583 int err;
584
585 cd = cache_create_net(&unix_gid_cache_template, net);
586 if (IS_ERR(cd))
587 return PTR_ERR(cd);
588 err = cache_register_net(cd, net);
589 if (err) {
590 cache_destroy_net(cd, net);
591 return err;
592 }
593 sn->unix_gid_cache = cd;
594 return 0;
595 }
596
597 void unix_gid_cache_destroy(struct net *net)
598 {
599 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
600 struct cache_detail *cd = sn->unix_gid_cache;
601
602 sn->unix_gid_cache = NULL;
603 cache_purge(cd);
604 cache_unregister_net(cd, net);
605 cache_destroy_net(cd, net);
606 }
607
608 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid)
609 {
610 struct unix_gid ug;
611 struct cache_head *ch;
612
613 ug.uid = uid;
614 ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
615 if (ch)
616 return container_of(ch, struct unix_gid, h);
617 else
618 return NULL;
619 }
620
621 static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
622 {
623 struct unix_gid *ug;
624 struct group_info *gi;
625 int ret;
626 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
627 sunrpc_net_id);
628
629 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
630 if (!ug)
631 return ERR_PTR(-EAGAIN);
632 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
633 switch (ret) {
634 case -ENOENT:
635 return ERR_PTR(-ENOENT);
636 case -ETIMEDOUT:
637 return ERR_PTR(-ESHUTDOWN);
638 case 0:
639 gi = get_group_info(ug->gi);
640 cache_put(&ug->h, sn->unix_gid_cache);
641 return gi;
642 default:
643 return ERR_PTR(-EAGAIN);
644 }
645 }
646
647 int
648 svcauth_unix_set_client(struct svc_rqst *rqstp)
649 {
650 struct sockaddr_in *sin;
651 struct sockaddr_in6 *sin6, sin6_storage;
652 struct ip_map *ipm;
653 struct group_info *gi;
654 struct svc_cred *cred = &rqstp->rq_cred;
655 struct svc_xprt *xprt = rqstp->rq_xprt;
656 struct net *net = xprt->xpt_net;
657 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
658
659 switch (rqstp->rq_addr.ss_family) {
660 case AF_INET:
661 sin = svc_addr_in(rqstp);
662 sin6 = &sin6_storage;
663 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
664 break;
665 case AF_INET6:
666 sin6 = svc_addr_in6(rqstp);
667 break;
668 default:
669 BUG();
670 }
671
672 rqstp->rq_client = NULL;
673 if (rqstp->rq_proc == 0)
674 return SVC_OK;
675
676 ipm = ip_map_cached_get(xprt);
677 if (ipm == NULL)
678 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
679 &sin6->sin6_addr);
680
681 if (ipm == NULL)
682 return SVC_DENIED;
683
684 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
685 default:
686 BUG();
687 case -ETIMEDOUT:
688 return SVC_CLOSE;
689 case -EAGAIN:
690 return SVC_DROP;
691 case -ENOENT:
692 return SVC_DENIED;
693 case 0:
694 rqstp->rq_client = &ipm->m_client->h;
695 kref_get(&rqstp->rq_client->ref);
696 ip_map_cached_put(xprt, ipm);
697 break;
698 }
699
700 gi = unix_gid_find(cred->cr_uid, rqstp);
701 switch (PTR_ERR(gi)) {
702 case -EAGAIN:
703 return SVC_DROP;
704 case -ESHUTDOWN:
705 return SVC_CLOSE;
706 case -ENOENT:
707 break;
708 default:
709 put_group_info(cred->cr_group_info);
710 cred->cr_group_info = gi;
711 }
712 return SVC_OK;
713 }
714
715 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
716
717 static int
718 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
719 {
720 struct kvec *argv = &rqstp->rq_arg.head[0];
721 struct kvec *resv = &rqstp->rq_res.head[0];
722 struct svc_cred *cred = &rqstp->rq_cred;
723
724 cred->cr_group_info = NULL;
725 cred->cr_principal = NULL;
726 rqstp->rq_client = NULL;
727
728 if (argv->iov_len < 3*4)
729 return SVC_GARBAGE;
730
731 if (svc_getu32(argv) != 0) {
732 dprintk("svc: bad null cred\n");
733 *authp = rpc_autherr_badcred;
734 return SVC_DENIED;
735 }
736 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
737 dprintk("svc: bad null verf\n");
738 *authp = rpc_autherr_badverf;
739 return SVC_DENIED;
740 }
741
742 /* Signal that mapping to nobody uid/gid is required */
743 cred->cr_uid = (uid_t) -1;
744 cred->cr_gid = (gid_t) -1;
745 cred->cr_group_info = groups_alloc(0);
746 if (cred->cr_group_info == NULL)
747 return SVC_CLOSE; /* kmalloc failure - client must retry */
748
749 /* Put NULL verifier */
750 svc_putnl(resv, RPC_AUTH_NULL);
751 svc_putnl(resv, 0);
752
753 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
754 return SVC_OK;
755 }
756
757 static int
758 svcauth_null_release(struct svc_rqst *rqstp)
759 {
760 if (rqstp->rq_client)
761 auth_domain_put(rqstp->rq_client);
762 rqstp->rq_client = NULL;
763 if (rqstp->rq_cred.cr_group_info)
764 put_group_info(rqstp->rq_cred.cr_group_info);
765 rqstp->rq_cred.cr_group_info = NULL;
766
767 return 0; /* don't drop */
768 }
769
770
771 struct auth_ops svcauth_null = {
772 .name = "null",
773 .owner = THIS_MODULE,
774 .flavour = RPC_AUTH_NULL,
775 .accept = svcauth_null_accept,
776 .release = svcauth_null_release,
777 .set_client = svcauth_unix_set_client,
778 };
779
780
781 static int
782 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
783 {
784 struct kvec *argv = &rqstp->rq_arg.head[0];
785 struct kvec *resv = &rqstp->rq_res.head[0];
786 struct svc_cred *cred = &rqstp->rq_cred;
787 u32 slen, i;
788 int len = argv->iov_len;
789
790 cred->cr_group_info = NULL;
791 cred->cr_principal = NULL;
792 rqstp->rq_client = NULL;
793
794 if ((len -= 3*4) < 0)
795 return SVC_GARBAGE;
796
797 svc_getu32(argv); /* length */
798 svc_getu32(argv); /* time stamp */
799 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
800 if (slen > 64 || (len -= (slen + 3)*4) < 0)
801 goto badcred;
802 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
803 argv->iov_len -= slen*4;
804
805 cred->cr_uid = svc_getnl(argv); /* uid */
806 cred->cr_gid = svc_getnl(argv); /* gid */
807 slen = svc_getnl(argv); /* gids length */
808 if (slen > 16 || (len -= (slen + 2)*4) < 0)
809 goto badcred;
810 cred->cr_group_info = groups_alloc(slen);
811 if (cred->cr_group_info == NULL)
812 return SVC_CLOSE;
813 for (i = 0; i < slen; i++) {
814 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
815 if (!gid_valid(kgid))
816 goto badcred;
817 GROUP_AT(cred->cr_group_info, i) = kgid;
818 }
819 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
820 *authp = rpc_autherr_badverf;
821 return SVC_DENIED;
822 }
823
824 /* Put NULL verifier */
825 svc_putnl(resv, RPC_AUTH_NULL);
826 svc_putnl(resv, 0);
827
828 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
829 return SVC_OK;
830
831 badcred:
832 *authp = rpc_autherr_badcred;
833 return SVC_DENIED;
834 }
835
836 static int
837 svcauth_unix_release(struct svc_rqst *rqstp)
838 {
839 /* Verifier (such as it is) is already in place.
840 */
841 if (rqstp->rq_client)
842 auth_domain_put(rqstp->rq_client);
843 rqstp->rq_client = NULL;
844 if (rqstp->rq_cred.cr_group_info)
845 put_group_info(rqstp->rq_cred.cr_group_info);
846 rqstp->rq_cred.cr_group_info = NULL;
847
848 return 0;
849 }
850
851
852 struct auth_ops svcauth_unix = {
853 .name = "unix",
854 .owner = THIS_MODULE,
855 .flavour = RPC_AUTH_UNIX,
856 .accept = svcauth_unix_accept,
857 .release = svcauth_unix_release,
858 .domain_release = svcauth_unix_domain_release,
859 .set_client = svcauth_unix_set_client,
860 };
861
862 static struct cache_detail ip_map_cache_template = {
863 .owner = THIS_MODULE,
864 .hash_size = IP_HASHMAX,
865 .name = "auth.unix.ip",
866 .cache_put = ip_map_put,
867 .cache_request = ip_map_request,
868 .cache_parse = ip_map_parse,
869 .cache_show = ip_map_show,
870 .match = ip_map_match,
871 .init = ip_map_init,
872 .update = update,
873 .alloc = ip_map_alloc,
874 };
875
876 int ip_map_cache_create(struct net *net)
877 {
878 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
879 struct cache_detail *cd;
880 int err;
881
882 cd = cache_create_net(&ip_map_cache_template, net);
883 if (IS_ERR(cd))
884 return PTR_ERR(cd);
885 err = cache_register_net(cd, net);
886 if (err) {
887 cache_destroy_net(cd, net);
888 return err;
889 }
890 sn->ip_map_cache = cd;
891 return 0;
892 }
893
894 void ip_map_cache_destroy(struct net *net)
895 {
896 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
897 struct cache_detail *cd = sn->ip_map_cache;
898
899 sn->ip_map_cache = NULL;
900 cache_purge(cd);
901 cache_unregister_net(cd, net);
902 cache_destroy_net(cd, net);
903 }
Linux 2.6 libata-dev (mirror)