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fs/adfs: move append_filetype_suffix() into adfs_object_fixup()
[linux-2.6/linux-2.6-arm.git] / net / sunrpc / svcauth_unix.c
blobfb9041b92f72233841cf1d173aa1b1cafe91e623
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_rcu(struct rcu_head *head)
41 {
42 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
43 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
44
45 kfree(dom->name);
46 kfree(ud);
47 }
48
49 static void svcauth_unix_domain_release(struct auth_domain *dom)
50 {
51 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
52 }
53
54 struct auth_domain *unix_domain_find(char *name)
55 {
56 struct auth_domain *rv;
57 struct unix_domain *new = NULL;
58
59 rv = auth_domain_find(name);
60 while(1) {
61 if (rv) {
62 if (new && rv != &new->h)
63 svcauth_unix_domain_release(&new->h);
64
65 if (rv->flavour != &svcauth_unix) {
66 auth_domain_put(rv);
67 return NULL;
68 }
69 return rv;
70 }
71
72 new = kmalloc(sizeof(*new), GFP_KERNEL);
73 if (new == NULL)
74 return NULL;
75 kref_init(&new->h.ref);
76 new->h.name = kstrdup(name, GFP_KERNEL);
77 if (new->h.name == NULL) {
78 kfree(new);
79 return NULL;
80 }
81 new->h.flavour = &svcauth_unix;
82 rv = auth_domain_lookup(name, &new->h);
83 }
84 }
85 EXPORT_SYMBOL_GPL(unix_domain_find);
86
87
88 /**************************************************
89 * cache for IP address to unix_domain
90 * as needed by AUTH_UNIX
91 */
92 #define IP_HASHBITS 8
93 #define IP_HASHMAX (1<<IP_HASHBITS)
94
95 struct ip_map {
96 struct cache_head h;
97 char m_class[8]; /* e.g. "nfsd" */
98 struct in6_addr m_addr;
99 struct unix_domain *m_client;
100 struct rcu_head m_rcu;
101 };
102
103 static void ip_map_put(struct kref *kref)
104 {
105 struct cache_head *item = container_of(kref, struct cache_head, ref);
106 struct ip_map *im = container_of(item, struct ip_map,h);
107
108 if (test_bit(CACHE_VALID, &item->flags) &&
109 !test_bit(CACHE_NEGATIVE, &item->flags))
110 auth_domain_put(&im->m_client->h);
111 kfree_rcu(im, m_rcu);
112 }
113
114 static inline int hash_ip6(const struct in6_addr *ip)
115 {
116 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
117 }
118 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
119 {
120 struct ip_map *orig = container_of(corig, struct ip_map, h);
121 struct ip_map *new = container_of(cnew, struct ip_map, h);
122 return strcmp(orig->m_class, new->m_class) == 0 &&
123 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
124 }
125 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
126 {
127 struct ip_map *new = container_of(cnew, struct ip_map, h);
128 struct ip_map *item = container_of(citem, struct ip_map, h);
129
130 strcpy(new->m_class, item->m_class);
131 new->m_addr = item->m_addr;
132 }
133 static void update(struct cache_head *cnew, struct cache_head *citem)
134 {
135 struct ip_map *new = container_of(cnew, struct ip_map, h);
136 struct ip_map *item = container_of(citem, struct ip_map, h);
137
138 kref_get(&item->m_client->h.ref);
139 new->m_client = item->m_client;
140 }
141 static struct cache_head *ip_map_alloc(void)
142 {
143 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
144 if (i)
145 return &i->h;
146 else
147 return NULL;
148 }
149
150 static void ip_map_request(struct cache_detail *cd,
151 struct cache_head *h,
152 char **bpp, int *blen)
153 {
154 char text_addr[40];
155 struct ip_map *im = container_of(h, struct ip_map, h);
156
157 if (ipv6_addr_v4mapped(&(im->m_addr))) {
158 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
159 } else {
160 snprintf(text_addr, 40, "%pI6", &im->m_addr);
161 }
162 qword_add(bpp, blen, im->m_class);
163 qword_add(bpp, blen, text_addr);
164 (*bpp)[-1] = '\n';
165 }
166
167 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
168 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
169
170 static int ip_map_parse(struct cache_detail *cd,
171 char *mesg, int mlen)
172 {
173 /* class ipaddress [domainname] */
174 /* should be safe just to use the start of the input buffer
175 * for scratch: */
176 char *buf = mesg;
177 int len;
178 char class[8];
179 union {
180 struct sockaddr sa;
181 struct sockaddr_in s4;
182 struct sockaddr_in6 s6;
183 } address;
184 struct sockaddr_in6 sin6;
185 int err;
186
187 struct ip_map *ipmp;
188 struct auth_domain *dom;
189 time_t expiry;
190
191 if (mesg[mlen-1] != '\n')
192 return -EINVAL;
193 mesg[mlen-1] = 0;
194
195 /* class */
196 len = qword_get(&mesg, class, sizeof(class));
197 if (len <= 0) return -EINVAL;
198
199 /* ip address */
200 len = qword_get(&mesg, buf, mlen);
201 if (len <= 0) return -EINVAL;
202
203 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
204 return -EINVAL;
205 switch (address.sa.sa_family) {
206 case AF_INET:
207 /* Form a mapped IPv4 address in sin6 */
208 sin6.sin6_family = AF_INET6;
209 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
210 &sin6.sin6_addr);
211 break;
212 #if IS_ENABLED(CONFIG_IPV6)
213 case AF_INET6:
214 memcpy(&sin6, &address.s6, sizeof(sin6));
215 break;
216 #endif
217 default:
218 return -EINVAL;
219 }
220
221 expiry = get_expiry(&mesg);
222 if (expiry ==0)
223 return -EINVAL;
224
225 /* domainname, or empty for NEGATIVE */
226 len = qword_get(&mesg, buf, mlen);
227 if (len < 0) return -EINVAL;
228
229 if (len) {
230 dom = unix_domain_find(buf);
231 if (dom == NULL)
232 return -ENOENT;
233 } else
234 dom = NULL;
235
236 /* IPv6 scope IDs are ignored for now */
237 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
238 if (ipmp) {
239 err = __ip_map_update(cd, ipmp,
240 container_of(dom, struct unix_domain, h),
241 expiry);
242 } else
243 err = -ENOMEM;
244
245 if (dom)
246 auth_domain_put(dom);
247
248 cache_flush();
249 return err;
250 }
251
252 static int ip_map_show(struct seq_file *m,
253 struct cache_detail *cd,
254 struct cache_head *h)
255 {
256 struct ip_map *im;
257 struct in6_addr addr;
258 char *dom = "-no-domain-";
259
260 if (h == NULL) {
261 seq_puts(m, "#class IP domain\n");
262 return 0;
263 }
264 im = container_of(h, struct ip_map, h);
265 /* class addr domain */
266 addr = im->m_addr;
267
268 if (test_bit(CACHE_VALID, &h->flags) &&
269 !test_bit(CACHE_NEGATIVE, &h->flags))
270 dom = im->m_client->h.name;
271
272 if (ipv6_addr_v4mapped(&addr)) {
273 seq_printf(m, "%s %pI4 %s\n",
274 im->m_class, &addr.s6_addr32[3], dom);
275 } else {
276 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
277 }
278 return 0;
279 }
280
281
282 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
283 struct in6_addr *addr)
284 {
285 struct ip_map ip;
286 struct cache_head *ch;
287
288 strcpy(ip.m_class, class);
289 ip.m_addr = *addr;
290 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
291 hash_str(class, IP_HASHBITS) ^
292 hash_ip6(addr));
293
294 if (ch)
295 return container_of(ch, struct ip_map, h);
296 else
297 return NULL;
298 }
299
300 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
301 struct in6_addr *addr)
302 {
303 struct sunrpc_net *sn;
304
305 sn = net_generic(net, sunrpc_net_id);
306 return __ip_map_lookup(sn->ip_map_cache, class, addr);
307 }
308
309 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
310 struct unix_domain *udom, time_t expiry)
311 {
312 struct ip_map ip;
313 struct cache_head *ch;
314
315 ip.m_client = udom;
316 ip.h.flags = 0;
317 if (!udom)
318 set_bit(CACHE_NEGATIVE, &ip.h.flags);
319 ip.h.expiry_time = expiry;
320 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
321 hash_str(ipm->m_class, IP_HASHBITS) ^
322 hash_ip6(&ipm->m_addr));
323 if (!ch)
324 return -ENOMEM;
325 cache_put(ch, cd);
326 return 0;
327 }
328
329 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
330 struct unix_domain *udom, time_t expiry)
331 {
332 struct sunrpc_net *sn;
333
334 sn = net_generic(net, sunrpc_net_id);
335 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
336 }
337
338 void svcauth_unix_purge(struct net *net)
339 {
340 struct sunrpc_net *sn;
341
342 sn = net_generic(net, sunrpc_net_id);
343 cache_purge(sn->ip_map_cache);
344 }
345 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
346
347 static inline struct ip_map *
348 ip_map_cached_get(struct svc_xprt *xprt)
349 {
350 struct ip_map *ipm = NULL;
351 struct sunrpc_net *sn;
352
353 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
354 spin_lock(&xprt->xpt_lock);
355 ipm = xprt->xpt_auth_cache;
356 if (ipm != NULL) {
357 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
358 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
359 /*
360 * The entry has been invalidated since it was
361 * remembered, e.g. by a second mount from the
362 * same IP address.
363 */
364 xprt->xpt_auth_cache = NULL;
365 spin_unlock(&xprt->xpt_lock);
366 cache_put(&ipm->h, sn->ip_map_cache);
367 return NULL;
368 }
369 cache_get(&ipm->h);
370 }
371 spin_unlock(&xprt->xpt_lock);
372 }
373 return ipm;
374 }
375
376 static inline void
377 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
378 {
379 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
380 spin_lock(&xprt->xpt_lock);
381 if (xprt->xpt_auth_cache == NULL) {
382 /* newly cached, keep the reference */
383 xprt->xpt_auth_cache = ipm;
384 ipm = NULL;
385 }
386 spin_unlock(&xprt->xpt_lock);
387 }
388 if (ipm) {
389 struct sunrpc_net *sn;
390
391 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
392 cache_put(&ipm->h, sn->ip_map_cache);
393 }
394 }
395
396 void
397 svcauth_unix_info_release(struct svc_xprt *xpt)
398 {
399 struct ip_map *ipm;
400
401 ipm = xpt->xpt_auth_cache;
402 if (ipm != NULL) {
403 struct sunrpc_net *sn;
404
405 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
406 cache_put(&ipm->h, sn->ip_map_cache);
407 }
408 }
409
410 /****************************************************************************
411 * auth.unix.gid cache
412 * simple cache to map a UID to a list of GIDs
413 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
414 */
415 #define GID_HASHBITS 8
416 #define GID_HASHMAX (1<<GID_HASHBITS)
417
418 struct unix_gid {
419 struct cache_head h;
420 kuid_t uid;
421 struct group_info *gi;
422 struct rcu_head rcu;
423 };
424
425 static int unix_gid_hash(kuid_t uid)
426 {
427 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
428 }
429
430 static void unix_gid_put(struct kref *kref)
431 {
432 struct cache_head *item = container_of(kref, struct cache_head, ref);
433 struct unix_gid *ug = container_of(item, struct unix_gid, h);
434 if (test_bit(CACHE_VALID, &item->flags) &&
435 !test_bit(CACHE_NEGATIVE, &item->flags))
436 put_group_info(ug->gi);
437 kfree_rcu(ug, rcu);
438 }
439
440 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
441 {
442 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
443 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
444 return uid_eq(orig->uid, new->uid);
445 }
446 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
447 {
448 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
449 struct unix_gid *item = container_of(citem, struct unix_gid, h);
450 new->uid = item->uid;
451 }
452 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
453 {
454 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
455 struct unix_gid *item = container_of(citem, struct unix_gid, h);
456
457 get_group_info(item->gi);
458 new->gi = item->gi;
459 }
460 static struct cache_head *unix_gid_alloc(void)
461 {
462 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
463 if (g)
464 return &g->h;
465 else
466 return NULL;
467 }
468
469 static void unix_gid_request(struct cache_detail *cd,
470 struct cache_head *h,
471 char **bpp, int *blen)
472 {
473 char tuid[20];
474 struct unix_gid *ug = container_of(h, struct unix_gid, h);
475
476 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
477 qword_add(bpp, blen, tuid);
478 (*bpp)[-1] = '\n';
479 }
480
481 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
482
483 static int unix_gid_parse(struct cache_detail *cd,
484 char *mesg, int mlen)
485 {
486 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
487 int id;
488 kuid_t uid;
489 int gids;
490 int rv;
491 int i;
492 int err;
493 time_t expiry;
494 struct unix_gid ug, *ugp;
495
496 if (mesg[mlen - 1] != '\n')
497 return -EINVAL;
498 mesg[mlen-1] = 0;
499
500 rv = get_int(&mesg, &id);
501 if (rv)
502 return -EINVAL;
503 uid = make_kuid(&init_user_ns, id);
504 ug.uid = uid;
505
506 expiry = get_expiry(&mesg);
507 if (expiry == 0)
508 return -EINVAL;
509
510 rv = get_int(&mesg, &gids);
511 if (rv || gids < 0 || gids > 8192)
512 return -EINVAL;
513
514 ug.gi = groups_alloc(gids);
515 if (!ug.gi)
516 return -ENOMEM;
517
518 for (i = 0 ; i < gids ; i++) {
519 int gid;
520 kgid_t kgid;
521 rv = get_int(&mesg, &gid);
522 err = -EINVAL;
523 if (rv)
524 goto out;
525 kgid = make_kgid(&init_user_ns, gid);
526 if (!gid_valid(kgid))
527 goto out;
528 ug.gi->gid[i] = kgid;
529 }
530
531 groups_sort(ug.gi);
532 ugp = unix_gid_lookup(cd, uid);
533 if (ugp) {
534 struct cache_head *ch;
535 ug.h.flags = 0;
536 ug.h.expiry_time = expiry;
537 ch = sunrpc_cache_update(cd,
538 &ug.h, &ugp->h,
539 unix_gid_hash(uid));
540 if (!ch)
541 err = -ENOMEM;
542 else {
543 err = 0;
544 cache_put(ch, cd);
545 }
546 } else
547 err = -ENOMEM;
548 out:
549 if (ug.gi)
550 put_group_info(ug.gi);
551 return err;
552 }
553
554 static int unix_gid_show(struct seq_file *m,
555 struct cache_detail *cd,
556 struct cache_head *h)
557 {
558 struct user_namespace *user_ns = &init_user_ns;
559 struct unix_gid *ug;
560 int i;
561 int glen;
562
563 if (h == NULL) {
564 seq_puts(m, "#uid cnt: gids...\n");
565 return 0;
566 }
567 ug = container_of(h, struct unix_gid, h);
568 if (test_bit(CACHE_VALID, &h->flags) &&
569 !test_bit(CACHE_NEGATIVE, &h->flags))
570 glen = ug->gi->ngroups;
571 else
572 glen = 0;
573
574 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
575 for (i = 0; i < glen; i++)
576 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
577 seq_printf(m, "\n");
578 return 0;
579 }
580
581 static const struct cache_detail unix_gid_cache_template = {
582 .owner = THIS_MODULE,
583 .hash_size = GID_HASHMAX,
584 .name = "auth.unix.gid",
585 .cache_put = unix_gid_put,
586 .cache_request = unix_gid_request,
587 .cache_parse = unix_gid_parse,
588 .cache_show = unix_gid_show,
589 .match = unix_gid_match,
590 .init = unix_gid_init,
591 .update = unix_gid_update,
592 .alloc = unix_gid_alloc,
593 };
594
595 int unix_gid_cache_create(struct net *net)
596 {
597 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
598 struct cache_detail *cd;
599 int err;
600
601 cd = cache_create_net(&unix_gid_cache_template, net);
602 if (IS_ERR(cd))
603 return PTR_ERR(cd);
604 err = cache_register_net(cd, net);
605 if (err) {
606 cache_destroy_net(cd, net);
607 return err;
608 }
609 sn->unix_gid_cache = cd;
610 return 0;
611 }
612
613 void unix_gid_cache_destroy(struct net *net)
614 {
615 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
616 struct cache_detail *cd = sn->unix_gid_cache;
617
618 sn->unix_gid_cache = NULL;
619 cache_purge(cd);
620 cache_unregister_net(cd, net);
621 cache_destroy_net(cd, net);
622 }
623
624 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
625 {
626 struct unix_gid ug;
627 struct cache_head *ch;
628
629 ug.uid = uid;
630 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
631 if (ch)
632 return container_of(ch, struct unix_gid, h);
633 else
634 return NULL;
635 }
636
637 static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
638 {
639 struct unix_gid *ug;
640 struct group_info *gi;
641 int ret;
642 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
643 sunrpc_net_id);
644
645 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
646 if (!ug)
647 return ERR_PTR(-EAGAIN);
648 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
649 switch (ret) {
650 case -ENOENT:
651 return ERR_PTR(-ENOENT);
652 case -ETIMEDOUT:
653 return ERR_PTR(-ESHUTDOWN);
654 case 0:
655 gi = get_group_info(ug->gi);
656 cache_put(&ug->h, sn->unix_gid_cache);
657 return gi;
658 default:
659 return ERR_PTR(-EAGAIN);
660 }
661 }
662
663 int
664 svcauth_unix_set_client(struct svc_rqst *rqstp)
665 {
666 struct sockaddr_in *sin;
667 struct sockaddr_in6 *sin6, sin6_storage;
668 struct ip_map *ipm;
669 struct group_info *gi;
670 struct svc_cred *cred = &rqstp->rq_cred;
671 struct svc_xprt *xprt = rqstp->rq_xprt;
672 struct net *net = xprt->xpt_net;
673 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
674
675 switch (rqstp->rq_addr.ss_family) {
676 case AF_INET:
677 sin = svc_addr_in(rqstp);
678 sin6 = &sin6_storage;
679 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
680 break;
681 case AF_INET6:
682 sin6 = svc_addr_in6(rqstp);
683 break;
684 default:
685 BUG();
686 }
687
688 rqstp->rq_client = NULL;
689 if (rqstp->rq_proc == 0)
690 return SVC_OK;
691
692 ipm = ip_map_cached_get(xprt);
693 if (ipm == NULL)
694 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
695 &sin6->sin6_addr);
696
697 if (ipm == NULL)
698 return SVC_DENIED;
699
700 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
701 default:
702 BUG();
703 case -ETIMEDOUT:
704 return SVC_CLOSE;
705 case -EAGAIN:
706 return SVC_DROP;
707 case -ENOENT:
708 return SVC_DENIED;
709 case 0:
710 rqstp->rq_client = &ipm->m_client->h;
711 kref_get(&rqstp->rq_client->ref);
712 ip_map_cached_put(xprt, ipm);
713 break;
714 }
715
716 gi = unix_gid_find(cred->cr_uid, rqstp);
717 switch (PTR_ERR(gi)) {
718 case -EAGAIN:
719 return SVC_DROP;
720 case -ESHUTDOWN:
721 return SVC_CLOSE;
722 case -ENOENT:
723 break;
724 default:
725 put_group_info(cred->cr_group_info);
726 cred->cr_group_info = gi;
727 }
728 return SVC_OK;
729 }
730
731 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
732
733 static int
734 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
735 {
736 struct kvec *argv = &rqstp->rq_arg.head[0];
737 struct kvec *resv = &rqstp->rq_res.head[0];
738 struct svc_cred *cred = &rqstp->rq_cred;
739
740 if (argv->iov_len < 3*4)
741 return SVC_GARBAGE;
742
743 if (svc_getu32(argv) != 0) {
744 dprintk("svc: bad null cred\n");
745 *authp = rpc_autherr_badcred;
746 return SVC_DENIED;
747 }
748 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
749 dprintk("svc: bad null verf\n");
750 *authp = rpc_autherr_badverf;
751 return SVC_DENIED;
752 }
753
754 /* Signal that mapping to nobody uid/gid is required */
755 cred->cr_uid = INVALID_UID;
756 cred->cr_gid = INVALID_GID;
757 cred->cr_group_info = groups_alloc(0);
758 if (cred->cr_group_info == NULL)
759 return SVC_CLOSE; /* kmalloc failure - client must retry */
760
761 /* Put NULL verifier */
762 svc_putnl(resv, RPC_AUTH_NULL);
763 svc_putnl(resv, 0);
764
765 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
766 return SVC_OK;
767 }
768
769 static int
770 svcauth_null_release(struct svc_rqst *rqstp)
771 {
772 if (rqstp->rq_client)
773 auth_domain_put(rqstp->rq_client);
774 rqstp->rq_client = NULL;
775 if (rqstp->rq_cred.cr_group_info)
776 put_group_info(rqstp->rq_cred.cr_group_info);
777 rqstp->rq_cred.cr_group_info = NULL;
778
779 return 0; /* don't drop */
780 }
781
782
783 struct auth_ops svcauth_null = {
784 .name = "null",
785 .owner = THIS_MODULE,
786 .flavour = RPC_AUTH_NULL,
787 .accept = svcauth_null_accept,
788 .release = svcauth_null_release,
789 .set_client = svcauth_unix_set_client,
790 };
791
792
793 static int
794 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
795 {
796 struct kvec *argv = &rqstp->rq_arg.head[0];
797 struct kvec *resv = &rqstp->rq_res.head[0];
798 struct svc_cred *cred = &rqstp->rq_cred;
799 u32 slen, i;
800 int len = argv->iov_len;
801
802 if ((len -= 3*4) < 0)
803 return SVC_GARBAGE;
804
805 svc_getu32(argv); /* length */
806 svc_getu32(argv); /* time stamp */
807 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
808 if (slen > 64 || (len -= (slen + 3)*4) < 0)
809 goto badcred;
810 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
811 argv->iov_len -= slen*4;
812 /*
813 * Note: we skip uid_valid()/gid_valid() checks here for
814 * backwards compatibility with clients that use -1 id's.
815 * Instead, -1 uid or gid is later mapped to the
816 * (export-specific) anonymous id by nfsd_setuser.
817 * Supplementary gid's will be left alone.
818 */
819 cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
820 cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
821 slen = svc_getnl(argv); /* gids length */
822 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
823 goto badcred;
824 cred->cr_group_info = groups_alloc(slen);
825 if (cred->cr_group_info == NULL)
826 return SVC_CLOSE;
827 for (i = 0; i < slen; i++) {
828 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
829 cred->cr_group_info->gid[i] = kgid;
830 }
831 groups_sort(cred->cr_group_info);
832 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
833 *authp = rpc_autherr_badverf;
834 return SVC_DENIED;
835 }
836
837 /* Put NULL verifier */
838 svc_putnl(resv, RPC_AUTH_NULL);
839 svc_putnl(resv, 0);
840
841 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
842 return SVC_OK;
843
844 badcred:
845 *authp = rpc_autherr_badcred;
846 return SVC_DENIED;
847 }
848
849 static int
850 svcauth_unix_release(struct svc_rqst *rqstp)
851 {
852 /* Verifier (such as it is) is already in place.
853 */
854 if (rqstp->rq_client)
855 auth_domain_put(rqstp->rq_client);
856 rqstp->rq_client = NULL;
857 if (rqstp->rq_cred.cr_group_info)
858 put_group_info(rqstp->rq_cred.cr_group_info);
859 rqstp->rq_cred.cr_group_info = NULL;
860
861 return 0;
862 }
863
864
865 struct auth_ops svcauth_unix = {
866 .name = "unix",
867 .owner = THIS_MODULE,
868 .flavour = RPC_AUTH_UNIX,
869 .accept = svcauth_unix_accept,
870 .release = svcauth_unix_release,
871 .domain_release = svcauth_unix_domain_release,
872 .set_client = svcauth_unix_set_client,
873 };
874
875 static const struct cache_detail ip_map_cache_template = {
876 .owner = THIS_MODULE,
877 .hash_size = IP_HASHMAX,
878 .name = "auth.unix.ip",
879 .cache_put = ip_map_put,
880 .cache_request = ip_map_request,
881 .cache_parse = ip_map_parse,
882 .cache_show = ip_map_show,
883 .match = ip_map_match,
884 .init = ip_map_init,
885 .update = update,
886 .alloc = ip_map_alloc,
887 };
888
889 int ip_map_cache_create(struct net *net)
890 {
891 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
892 struct cache_detail *cd;
893 int err;
894
895 cd = cache_create_net(&ip_map_cache_template, net);
896 if (IS_ERR(cd))
897 return PTR_ERR(cd);
898 err = cache_register_net(cd, net);
899 if (err) {
900 cache_destroy_net(cd, net);
901 return err;
902 }
903 sn->ip_map_cache = cd;
904 return 0;
905 }
906
907 void ip_map_cache_destroy(struct net *net)
908 {
909 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
910 struct cache_detail *cd = sn->ip_map_cache;
911
912 sn->ip_map_cache = NULL;
913 cache_purge(cd);
914 cache_unregister_net(cd, net);
915 cache_destroy_net(cd, net);
916 }
Mirror of linux-2.6-arm at arm.linux.org.uk