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mm: remove unused memclear_highpage_flush()
[linux-2.6.git] / net / sunrpc / svcauth_unix.c
blob4d012920373345ccb7b76957e792900c143505e9
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/err.h>
10 #include <linux/seq_file.h>
11 #include <linux/hash.h>
12 #include <linux/string.h>
13 #include <linux/slab.h>
14 #include <net/sock.h>
15 #include <net/ipv6.h>
16 #include <linux/kernel.h>
17 #include <linux/user_namespace.h>
18 #define RPCDBG_FACILITY RPCDBG_AUTH
19
20 #include <linux/sunrpc/clnt.h>
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 int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
161 {
162 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
163 }
164
165 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
166 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
167
168 static int ip_map_parse(struct cache_detail *cd,
169 char *mesg, int mlen)
170 {
171 /* class ipaddress [domainname] */
172 /* should be safe just to use the start of the input buffer
173 * for scratch: */
174 char *buf = mesg;
175 int len;
176 char class[8];
177 union {
178 struct sockaddr sa;
179 struct sockaddr_in s4;
180 struct sockaddr_in6 s6;
181 } address;
182 struct sockaddr_in6 sin6;
183 int err;
184
185 struct ip_map *ipmp;
186 struct auth_domain *dom;
187 time_t expiry;
188
189 if (mesg[mlen-1] != '\n')
190 return -EINVAL;
191 mesg[mlen-1] = 0;
192
193 /* class */
194 len = qword_get(&mesg, class, sizeof(class));
195 if (len <= 0) return -EINVAL;
196
197 /* ip address */
198 len = qword_get(&mesg, buf, mlen);
199 if (len <= 0) return -EINVAL;
200
201 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
202 return -EINVAL;
203 switch (address.sa.sa_family) {
204 case AF_INET:
205 /* Form a mapped IPv4 address in sin6 */
206 sin6.sin6_family = AF_INET6;
207 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
208 &sin6.sin6_addr);
209 break;
210 #if IS_ENABLED(CONFIG_IPV6)
211 case AF_INET6:
212 memcpy(&sin6, &address.s6, sizeof(sin6));
213 break;
214 #endif
215 default:
216 return -EINVAL;
217 }
218
219 expiry = get_expiry(&mesg);
220 if (expiry ==0)
221 return -EINVAL;
222
223 /* domainname, or empty for NEGATIVE */
224 len = qword_get(&mesg, buf, mlen);
225 if (len < 0) return -EINVAL;
226
227 if (len) {
228 dom = unix_domain_find(buf);
229 if (dom == NULL)
230 return -ENOENT;
231 } else
232 dom = NULL;
233
234 /* IPv6 scope IDs are ignored for now */
235 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
236 if (ipmp) {
237 err = __ip_map_update(cd, ipmp,
238 container_of(dom, struct unix_domain, h),
239 expiry);
240 } else
241 err = -ENOMEM;
242
243 if (dom)
244 auth_domain_put(dom);
245
246 cache_flush();
247 return err;
248 }
249
250 static int ip_map_show(struct seq_file *m,
251 struct cache_detail *cd,
252 struct cache_head *h)
253 {
254 struct ip_map *im;
255 struct in6_addr addr;
256 char *dom = "-no-domain-";
257
258 if (h == NULL) {
259 seq_puts(m, "#class IP domain\n");
260 return 0;
261 }
262 im = container_of(h, struct ip_map, h);
263 /* class addr domain */
264 addr = im->m_addr;
265
266 if (test_bit(CACHE_VALID, &h->flags) &&
267 !test_bit(CACHE_NEGATIVE, &h->flags))
268 dom = im->m_client->h.name;
269
270 if (ipv6_addr_v4mapped(&addr)) {
271 seq_printf(m, "%s %pI4 %s\n",
272 im->m_class, &addr.s6_addr32[3], dom);
273 } else {
274 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
275 }
276 return 0;
277 }
278
279
280 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
281 struct in6_addr *addr)
282 {
283 struct ip_map ip;
284 struct cache_head *ch;
285
286 strcpy(ip.m_class, class);
287 ip.m_addr = *addr;
288 ch = sunrpc_cache_lookup(cd, &ip.h,
289 hash_str(class, IP_HASHBITS) ^
290 hash_ip6(addr));
291
292 if (ch)
293 return container_of(ch, struct ip_map, h);
294 else
295 return NULL;
296 }
297
298 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
299 struct in6_addr *addr)
300 {
301 struct sunrpc_net *sn;
302
303 sn = net_generic(net, sunrpc_net_id);
304 return __ip_map_lookup(sn->ip_map_cache, class, addr);
305 }
306
307 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
308 struct unix_domain *udom, time_t expiry)
309 {
310 struct ip_map ip;
311 struct cache_head *ch;
312
313 ip.m_client = udom;
314 ip.h.flags = 0;
315 if (!udom)
316 set_bit(CACHE_NEGATIVE, &ip.h.flags);
317 ip.h.expiry_time = expiry;
318 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
319 hash_str(ipm->m_class, IP_HASHBITS) ^
320 hash_ip6(&ipm->m_addr));
321 if (!ch)
322 return -ENOMEM;
323 cache_put(ch, cd);
324 return 0;
325 }
326
327 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
328 struct unix_domain *udom, time_t expiry)
329 {
330 struct sunrpc_net *sn;
331
332 sn = net_generic(net, sunrpc_net_id);
333 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
334 }
335
336 void svcauth_unix_purge(struct net *net)
337 {
338 struct sunrpc_net *sn;
339
340 sn = net_generic(net, sunrpc_net_id);
341 cache_purge(sn->ip_map_cache);
342 }
343 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
344
345 static inline struct ip_map *
346 ip_map_cached_get(struct svc_xprt *xprt)
347 {
348 struct ip_map *ipm = NULL;
349 struct sunrpc_net *sn;
350
351 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
352 spin_lock(&xprt->xpt_lock);
353 ipm = xprt->xpt_auth_cache;
354 if (ipm != NULL) {
355 if (!cache_valid(&ipm->h)) {
356 /*
357 * The entry has been invalidated since it was
358 * remembered, e.g. by a second mount from the
359 * same IP address.
360 */
361 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
362 xprt->xpt_auth_cache = NULL;
363 spin_unlock(&xprt->xpt_lock);
364 cache_put(&ipm->h, sn->ip_map_cache);
365 return NULL;
366 }
367 cache_get(&ipm->h);
368 }
369 spin_unlock(&xprt->xpt_lock);
370 }
371 return ipm;
372 }
373
374 static inline void
375 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
376 {
377 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
378 spin_lock(&xprt->xpt_lock);
379 if (xprt->xpt_auth_cache == NULL) {
380 /* newly cached, keep the reference */
381 xprt->xpt_auth_cache = ipm;
382 ipm = NULL;
383 }
384 spin_unlock(&xprt->xpt_lock);
385 }
386 if (ipm) {
387 struct sunrpc_net *sn;
388
389 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
390 cache_put(&ipm->h, sn->ip_map_cache);
391 }
392 }
393
394 void
395 svcauth_unix_info_release(struct svc_xprt *xpt)
396 {
397 struct ip_map *ipm;
398
399 ipm = xpt->xpt_auth_cache;
400 if (ipm != NULL) {
401 struct sunrpc_net *sn;
402
403 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
404 cache_put(&ipm->h, sn->ip_map_cache);
405 }
406 }
407
408 /****************************************************************************
409 * auth.unix.gid cache
410 * simple cache to map a UID to a list of GIDs
411 * because AUTH_UNIX aka AUTH_SYS has a max of 16
412 */
413 #define GID_HASHBITS 8
414 #define GID_HASHMAX (1<<GID_HASHBITS)
415
416 struct unix_gid {
417 struct cache_head h;
418 uid_t uid;
419 struct group_info *gi;
420 };
421
422 static void unix_gid_put(struct kref *kref)
423 {
424 struct cache_head *item = container_of(kref, struct cache_head, ref);
425 struct unix_gid *ug = container_of(item, struct unix_gid, h);
426 if (test_bit(CACHE_VALID, &item->flags) &&
427 !test_bit(CACHE_NEGATIVE, &item->flags))
428 put_group_info(ug->gi);
429 kfree(ug);
430 }
431
432 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
433 {
434 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
435 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
436 return orig->uid == new->uid;
437 }
438 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
439 {
440 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
441 struct unix_gid *item = container_of(citem, struct unix_gid, h);
442 new->uid = item->uid;
443 }
444 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
445 {
446 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
447 struct unix_gid *item = container_of(citem, struct unix_gid, h);
448
449 get_group_info(item->gi);
450 new->gi = item->gi;
451 }
452 static struct cache_head *unix_gid_alloc(void)
453 {
454 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
455 if (g)
456 return &g->h;
457 else
458 return NULL;
459 }
460
461 static void unix_gid_request(struct cache_detail *cd,
462 struct cache_head *h,
463 char **bpp, int *blen)
464 {
465 char tuid[20];
466 struct unix_gid *ug = container_of(h, struct unix_gid, h);
467
468 snprintf(tuid, 20, "%u", ug->uid);
469 qword_add(bpp, blen, tuid);
470 (*bpp)[-1] = '\n';
471 }
472
473 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
474 {
475 return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
476 }
477
478 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid);
479
480 static int unix_gid_parse(struct cache_detail *cd,
481 char *mesg, int mlen)
482 {
483 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
484 int uid;
485 int gids;
486 int rv;
487 int i;
488 int err;
489 time_t expiry;
490 struct unix_gid ug, *ugp;
491
492 if (mesg[mlen - 1] != '\n')
493 return -EINVAL;
494 mesg[mlen-1] = 0;
495
496 rv = get_int(&mesg, &uid);
497 if (rv)
498 return -EINVAL;
499 ug.uid = uid;
500
501 expiry = get_expiry(&mesg);
502 if (expiry == 0)
503 return -EINVAL;
504
505 rv = get_int(&mesg, &gids);
506 if (rv || gids < 0 || gids > 8192)
507 return -EINVAL;
508
509 ug.gi = groups_alloc(gids);
510 if (!ug.gi)
511 return -ENOMEM;
512
513 for (i = 0 ; i < gids ; i++) {
514 int gid;
515 kgid_t kgid;
516 rv = get_int(&mesg, &gid);
517 err = -EINVAL;
518 if (rv)
519 goto out;
520 kgid = make_kgid(&init_user_ns, gid);
521 if (!gid_valid(kgid))
522 goto out;
523 GROUP_AT(ug.gi, i) = kgid;
524 }
525
526 ugp = unix_gid_lookup(cd, uid);
527 if (ugp) {
528 struct cache_head *ch;
529 ug.h.flags = 0;
530 ug.h.expiry_time = expiry;
531 ch = sunrpc_cache_update(cd,
532 &ug.h, &ugp->h,
533 hash_long(uid, GID_HASHBITS));
534 if (!ch)
535 err = -ENOMEM;
536 else {
537 err = 0;
538 cache_put(ch, cd);
539 }
540 } else
541 err = -ENOMEM;
542 out:
543 if (ug.gi)
544 put_group_info(ug.gi);
545 return err;
546 }
547
548 static int unix_gid_show(struct seq_file *m,
549 struct cache_detail *cd,
550 struct cache_head *h)
551 {
552 struct user_namespace *user_ns = current_user_ns();
553 struct unix_gid *ug;
554 int i;
555 int glen;
556
557 if (h == NULL) {
558 seq_puts(m, "#uid cnt: gids...\n");
559 return 0;
560 }
561 ug = container_of(h, struct unix_gid, h);
562 if (test_bit(CACHE_VALID, &h->flags) &&
563 !test_bit(CACHE_NEGATIVE, &h->flags))
564 glen = ug->gi->ngroups;
565 else
566 glen = 0;
567
568 seq_printf(m, "%u %d:", ug->uid, glen);
569 for (i = 0; i < glen; i++)
570 seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
571 seq_printf(m, "\n");
572 return 0;
573 }
574
575 static struct cache_detail unix_gid_cache_template = {
576 .owner = THIS_MODULE,
577 .hash_size = GID_HASHMAX,
578 .name = "auth.unix.gid",
579 .cache_put = unix_gid_put,
580 .cache_upcall = unix_gid_upcall,
581 .cache_parse = unix_gid_parse,
582 .cache_show = unix_gid_show,
583 .match = unix_gid_match,
584 .init = unix_gid_init,
585 .update = unix_gid_update,
586 .alloc = unix_gid_alloc,
587 };
588
589 int unix_gid_cache_create(struct net *net)
590 {
591 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
592 struct cache_detail *cd;
593 int err;
594
595 cd = cache_create_net(&unix_gid_cache_template, net);
596 if (IS_ERR(cd))
597 return PTR_ERR(cd);
598 err = cache_register_net(cd, net);
599 if (err) {
600 cache_destroy_net(cd, net);
601 return err;
602 }
603 sn->unix_gid_cache = cd;
604 return 0;
605 }
606
607 void unix_gid_cache_destroy(struct net *net)
608 {
609 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
610 struct cache_detail *cd = sn->unix_gid_cache;
611
612 sn->unix_gid_cache = NULL;
613 cache_purge(cd);
614 cache_unregister_net(cd, net);
615 cache_destroy_net(cd, net);
616 }
617
618 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid)
619 {
620 struct unix_gid ug;
621 struct cache_head *ch;
622
623 ug.uid = uid;
624 ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
625 if (ch)
626 return container_of(ch, struct unix_gid, h);
627 else
628 return NULL;
629 }
630
631 static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
632 {
633 struct unix_gid *ug;
634 struct group_info *gi;
635 int ret;
636 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
637 sunrpc_net_id);
638
639 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
640 if (!ug)
641 return ERR_PTR(-EAGAIN);
642 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
643 switch (ret) {
644 case -ENOENT:
645 return ERR_PTR(-ENOENT);
646 case -ETIMEDOUT:
647 return ERR_PTR(-ESHUTDOWN);
648 case 0:
649 gi = get_group_info(ug->gi);
650 cache_put(&ug->h, sn->unix_gid_cache);
651 return gi;
652 default:
653 return ERR_PTR(-EAGAIN);
654 }
655 }
656
657 int
658 svcauth_unix_set_client(struct svc_rqst *rqstp)
659 {
660 struct sockaddr_in *sin;
661 struct sockaddr_in6 *sin6, sin6_storage;
662 struct ip_map *ipm;
663 struct group_info *gi;
664 struct svc_cred *cred = &rqstp->rq_cred;
665 struct svc_xprt *xprt = rqstp->rq_xprt;
666 struct net *net = xprt->xpt_net;
667 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
668
669 switch (rqstp->rq_addr.ss_family) {
670 case AF_INET:
671 sin = svc_addr_in(rqstp);
672 sin6 = &sin6_storage;
673 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
674 break;
675 case AF_INET6:
676 sin6 = svc_addr_in6(rqstp);
677 break;
678 default:
679 BUG();
680 }
681
682 rqstp->rq_client = NULL;
683 if (rqstp->rq_proc == 0)
684 return SVC_OK;
685
686 ipm = ip_map_cached_get(xprt);
687 if (ipm == NULL)
688 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
689 &sin6->sin6_addr);
690
691 if (ipm == NULL)
692 return SVC_DENIED;
693
694 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
695 default:
696 BUG();
697 case -ETIMEDOUT:
698 return SVC_CLOSE;
699 case -EAGAIN:
700 return SVC_DROP;
701 case -ENOENT:
702 return SVC_DENIED;
703 case 0:
704 rqstp->rq_client = &ipm->m_client->h;
705 kref_get(&rqstp->rq_client->ref);
706 ip_map_cached_put(xprt, ipm);
707 break;
708 }
709
710 gi = unix_gid_find(cred->cr_uid, rqstp);
711 switch (PTR_ERR(gi)) {
712 case -EAGAIN:
713 return SVC_DROP;
714 case -ESHUTDOWN:
715 return SVC_CLOSE;
716 case -ENOENT:
717 break;
718 default:
719 put_group_info(cred->cr_group_info);
720 cred->cr_group_info = gi;
721 }
722 return SVC_OK;
723 }
724
725 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
726
727 static int
728 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
729 {
730 struct kvec *argv = &rqstp->rq_arg.head[0];
731 struct kvec *resv = &rqstp->rq_res.head[0];
732 struct svc_cred *cred = &rqstp->rq_cred;
733
734 cred->cr_group_info = NULL;
735 cred->cr_principal = NULL;
736 rqstp->rq_client = NULL;
737
738 if (argv->iov_len < 3*4)
739 return SVC_GARBAGE;
740
741 if (svc_getu32(argv) != 0) {
742 dprintk("svc: bad null cred\n");
743 *authp = rpc_autherr_badcred;
744 return SVC_DENIED;
745 }
746 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
747 dprintk("svc: bad null verf\n");
748 *authp = rpc_autherr_badverf;
749 return SVC_DENIED;
750 }
751
752 /* Signal that mapping to nobody uid/gid is required */
753 cred->cr_uid = (uid_t) -1;
754 cred->cr_gid = (gid_t) -1;
755 cred->cr_group_info = groups_alloc(0);
756 if (cred->cr_group_info == NULL)
757 return SVC_CLOSE; /* kmalloc failure - client must retry */
758
759 /* Put NULL verifier */
760 svc_putnl(resv, RPC_AUTH_NULL);
761 svc_putnl(resv, 0);
762
763 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
764 return SVC_OK;
765 }
766
767 static int
768 svcauth_null_release(struct svc_rqst *rqstp)
769 {
770 if (rqstp->rq_client)
771 auth_domain_put(rqstp->rq_client);
772 rqstp->rq_client = NULL;
773 if (rqstp->rq_cred.cr_group_info)
774 put_group_info(rqstp->rq_cred.cr_group_info);
775 rqstp->rq_cred.cr_group_info = NULL;
776
777 return 0; /* don't drop */
778 }
779
780
781 struct auth_ops svcauth_null = {
782 .name = "null",
783 .owner = THIS_MODULE,
784 .flavour = RPC_AUTH_NULL,
785 .accept = svcauth_null_accept,
786 .release = svcauth_null_release,
787 .set_client = svcauth_unix_set_client,
788 };
789
790
791 static int
792 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
793 {
794 struct kvec *argv = &rqstp->rq_arg.head[0];
795 struct kvec *resv = &rqstp->rq_res.head[0];
796 struct svc_cred *cred = &rqstp->rq_cred;
797 u32 slen, i;
798 int len = argv->iov_len;
799
800 cred->cr_group_info = NULL;
801 cred->cr_principal = NULL;
802 rqstp->rq_client = NULL;
803
804 if ((len -= 3*4) < 0)
805 return SVC_GARBAGE;
806
807 svc_getu32(argv); /* length */
808 svc_getu32(argv); /* time stamp */
809 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
810 if (slen > 64 || (len -= (slen + 3)*4) < 0)
811 goto badcred;
812 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
813 argv->iov_len -= slen*4;
814
815 cred->cr_uid = svc_getnl(argv); /* uid */
816 cred->cr_gid = svc_getnl(argv); /* gid */
817 slen = svc_getnl(argv); /* gids length */
818 if (slen > 16 || (len -= (slen + 2)*4) < 0)
819 goto badcred;
820 cred->cr_group_info = groups_alloc(slen);
821 if (cred->cr_group_info == NULL)
822 return SVC_CLOSE;
823 for (i = 0; i < slen; i++) {
824 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
825 if (!gid_valid(kgid))
826 goto badcred;
827 GROUP_AT(cred->cr_group_info, i) = kgid;
828 }
829 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
830 *authp = rpc_autherr_badverf;
831 return SVC_DENIED;
832 }
833
834 /* Put NULL verifier */
835 svc_putnl(resv, RPC_AUTH_NULL);
836 svc_putnl(resv, 0);
837
838 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
839 return SVC_OK;
840
841 badcred:
842 *authp = rpc_autherr_badcred;
843 return SVC_DENIED;
844 }
845
846 static int
847 svcauth_unix_release(struct svc_rqst *rqstp)
848 {
849 /* Verifier (such as it is) is already in place.
850 */
851 if (rqstp->rq_client)
852 auth_domain_put(rqstp->rq_client);
853 rqstp->rq_client = NULL;
854 if (rqstp->rq_cred.cr_group_info)
855 put_group_info(rqstp->rq_cred.cr_group_info);
856 rqstp->rq_cred.cr_group_info = NULL;
857
858 return 0;
859 }
860
861
862 struct auth_ops svcauth_unix = {
863 .name = "unix",
864 .owner = THIS_MODULE,
865 .flavour = RPC_AUTH_UNIX,
866 .accept = svcauth_unix_accept,
867 .release = svcauth_unix_release,
868 .domain_release = svcauth_unix_domain_release,
869 .set_client = svcauth_unix_set_client,
870 };
871
872 static struct cache_detail ip_map_cache_template = {
873 .owner = THIS_MODULE,
874 .hash_size = IP_HASHMAX,
875 .name = "auth.unix.ip",
876 .cache_put = ip_map_put,
877 .cache_upcall = ip_map_upcall,
878 .cache_parse = ip_map_parse,
879 .cache_show = ip_map_show,
880 .match = ip_map_match,
881 .init = ip_map_init,
882 .update = update,
883 .alloc = ip_map_alloc,
884 };
885
886 int ip_map_cache_create(struct net *net)
887 {
888 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
889 struct cache_detail *cd;
890 int err;
891
892 cd = cache_create_net(&ip_map_cache_template, net);
893 if (IS_ERR(cd))
894 return PTR_ERR(cd);
895 err = cache_register_net(cd, net);
896 if (err) {
897 cache_destroy_net(cd, net);
898 return err;
899 }
900 sn->ip_map_cache = cd;
901 return 0;
902 }
903
904 void ip_map_cache_destroy(struct net *net)
905 {
906 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
907 struct cache_detail *cd = sn->ip_map_cache;
908
909 sn->ip_map_cache = NULL;
910 cache_purge(cd);
911 cache_unregister_net(cd, net);
912 cache_destroy_net(cd, net);
913 }
Linus' kernel tree