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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/types.h>
3#include <linux/sched.h>
4#include <linux/module.h>
5#include <linux/sunrpc/types.h>
6#include <linux/sunrpc/xdr.h>
7#include <linux/sunrpc/svcsock.h>
8#include <linux/sunrpc/svcauth.h>
9#include <linux/sunrpc/gss_api.h>
10#include <linux/sunrpc/addr.h>
11#include <linux/err.h>
12#include <linux/seq_file.h>
13#include <linux/hash.h>
14#include <linux/string.h>
15#include <linux/slab.h>
16#include <net/sock.h>
17#include <net/ipv6.h>
18#include <linux/kernel.h>
19#include <linux/user_namespace.h>
20#define RPCDBG_FACILITY RPCDBG_AUTH
21
22
23#include "netns.h"
24
25/*
26 * AUTHUNIX and AUTHNULL credentials are both handled here.
27 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
28 * are always nobody (-2). i.e. we do the same IP address checks for
29 * AUTHNULL as for AUTHUNIX, and that is done here.
30 */
31
32
33struct unix_domain {
34 struct auth_domain h;
35 /* other stuff later */
36};
37
38extern struct auth_ops svcauth_null;
39extern struct auth_ops svcauth_unix;
40
41static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
42{
43 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
44 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
45
46 kfree(dom->name);
47 kfree(ud);
48}
49
50static void svcauth_unix_domain_release(struct auth_domain *dom)
51{
52 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
53}
54
55struct auth_domain *unix_domain_find(char *name)
56{
57 struct auth_domain *rv;
58 struct unix_domain *new = NULL;
59
60 rv = auth_domain_find(name);
61 while(1) {
62 if (rv) {
63 if (new && rv != &new->h)
64 svcauth_unix_domain_release(&new->h);
65
66 if (rv->flavour != &svcauth_unix) {
67 auth_domain_put(rv);
68 return NULL;
69 }
70 return rv;
71 }
72
73 new = kmalloc(sizeof(*new), GFP_KERNEL);
74 if (new == NULL)
75 return NULL;
76 kref_init(&new->h.ref);
77 new->h.name = kstrdup(name, GFP_KERNEL);
78 if (new->h.name == NULL) {
79 kfree(new);
80 return NULL;
81 }
82 new->h.flavour = &svcauth_unix;
83 rv = auth_domain_lookup(name, &new->h);
84 }
85}
86EXPORT_SYMBOL_GPL(unix_domain_find);
87
88
89/**************************************************
90 * cache for IP address to unix_domain
91 * as needed by AUTH_UNIX
92 */
93#define IP_HASHBITS 8
94#define IP_HASHMAX (1<<IP_HASHBITS)
95
96struct ip_map {
97 struct cache_head h;
98 char m_class[8]; /* e.g. "nfsd" */
99 struct in6_addr m_addr;
100 struct unix_domain *m_client;
101 struct rcu_head m_rcu;
102};
103
104static void ip_map_put(struct kref *kref)
105{
106 struct cache_head *item = container_of(kref, struct cache_head, ref);
107 struct ip_map *im = container_of(item, struct ip_map,h);
108
109 if (test_bit(CACHE_VALID, &item->flags) &&
110 !test_bit(CACHE_NEGATIVE, &item->flags))
111 auth_domain_put(&im->m_client->h);
112 kfree_rcu(im, m_rcu);
113}
114
115static inline int hash_ip6(const struct in6_addr *ip)
116{
117 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
118}
119static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
120{
121 struct ip_map *orig = container_of(corig, struct ip_map, h);
122 struct ip_map *new = container_of(cnew, struct ip_map, h);
123 return strcmp(orig->m_class, new->m_class) == 0 &&
124 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
125}
126static void ip_map_init(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 strcpy(new->m_class, item->m_class);
132 new->m_addr = item->m_addr;
133}
134static void update(struct cache_head *cnew, struct cache_head *citem)
135{
136 struct ip_map *new = container_of(cnew, struct ip_map, h);
137 struct ip_map *item = container_of(citem, struct ip_map, h);
138
139 kref_get(&item->m_client->h.ref);
140 new->m_client = item->m_client;
141}
142static struct cache_head *ip_map_alloc(void)
143{
144 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
145 if (i)
146 return &i->h;
147 else
148 return NULL;
149}
150
151static void ip_map_request(struct cache_detail *cd,
152 struct cache_head *h,
153 char **bpp, int *blen)
154{
155 char text_addr[40];
156 struct ip_map *im = container_of(h, struct ip_map, h);
157
158 if (ipv6_addr_v4mapped(&(im->m_addr))) {
159 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
160 } else {
161 snprintf(text_addr, 40, "%pI6", &im->m_addr);
162 }
163 qword_add(bpp, blen, im->m_class);
164 qword_add(bpp, blen, text_addr);
165 (*bpp)[-1] = '\n';
166}
167
168static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
169static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
170
171static int ip_map_parse(struct cache_detail *cd,
172 char *mesg, int mlen)
173{
174 /* class ipaddress [domainname] */
175 /* should be safe just to use the start of the input buffer
176 * for scratch: */
177 char *buf = mesg;
178 int len;
179 char class[8];
180 union {
181 struct sockaddr sa;
182 struct sockaddr_in s4;
183 struct sockaddr_in6 s6;
184 } address;
185 struct sockaddr_in6 sin6;
186 int err;
187
188 struct ip_map *ipmp;
189 struct auth_domain *dom;
190 time_t expiry;
191
192 if (mesg[mlen-1] != '\n')
193 return -EINVAL;
194 mesg[mlen-1] = 0;
195
196 /* class */
197 len = qword_get(&mesg, class, sizeof(class));
198 if (len <= 0) return -EINVAL;
199
200 /* ip address */
201 len = qword_get(&mesg, buf, mlen);
202 if (len <= 0) return -EINVAL;
203
204 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
205 return -EINVAL;
206 switch (address.sa.sa_family) {
207 case AF_INET:
208 /* Form a mapped IPv4 address in sin6 */
209 sin6.sin6_family = AF_INET6;
210 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
211 &sin6.sin6_addr);
212 break;
213#if IS_ENABLED(CONFIG_IPV6)
214 case AF_INET6:
215 memcpy(&sin6, &address.s6, sizeof(sin6));
216 break;
217#endif
218 default:
219 return -EINVAL;
220 }
221
222 expiry = get_expiry(&mesg);
223 if (expiry ==0)
224 return -EINVAL;
225
226 /* domainname, or empty for NEGATIVE */
227 len = qword_get(&mesg, buf, mlen);
228 if (len < 0) return -EINVAL;
229
230 if (len) {
231 dom = unix_domain_find(buf);
232 if (dom == NULL)
233 return -ENOENT;
234 } else
235 dom = NULL;
236
237 /* IPv6 scope IDs are ignored for now */
238 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
239 if (ipmp) {
240 err = __ip_map_update(cd, ipmp,
241 container_of(dom, struct unix_domain, h),
242 expiry);
243 } else
244 err = -ENOMEM;
245
246 if (dom)
247 auth_domain_put(dom);
248
249 cache_flush();
250 return err;
251}
252
253static int ip_map_show(struct seq_file *m,
254 struct cache_detail *cd,
255 struct cache_head *h)
256{
257 struct ip_map *im;
258 struct in6_addr addr;
259 char *dom = "-no-domain-";
260
261 if (h == NULL) {
262 seq_puts(m, "#class IP domain\n");
263 return 0;
264 }
265 im = container_of(h, struct ip_map, h);
266 /* class addr domain */
267 addr = im->m_addr;
268
269 if (test_bit(CACHE_VALID, &h->flags) &&
270 !test_bit(CACHE_NEGATIVE, &h->flags))
271 dom = im->m_client->h.name;
272
273 if (ipv6_addr_v4mapped(&addr)) {
274 seq_printf(m, "%s %pI4 %s\n",
275 im->m_class, &addr.s6_addr32[3], dom);
276 } else {
277 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
278 }
279 return 0;
280}
281
282
283static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
284 struct in6_addr *addr)
285{
286 struct ip_map ip;
287 struct cache_head *ch;
288
289 strcpy(ip.m_class, class);
290 ip.m_addr = *addr;
291 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
292 hash_str(class, IP_HASHBITS) ^
293 hash_ip6(addr));
294
295 if (ch)
296 return container_of(ch, struct ip_map, h);
297 else
298 return NULL;
299}
300
301static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
302 struct in6_addr *addr)
303{
304 struct sunrpc_net *sn;
305
306 sn = net_generic(net, sunrpc_net_id);
307 return __ip_map_lookup(sn->ip_map_cache, class, addr);
308}
309
310static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
311 struct unix_domain *udom, time_t expiry)
312{
313 struct ip_map ip;
314 struct cache_head *ch;
315
316 ip.m_client = udom;
317 ip.h.flags = 0;
318 if (!udom)
319 set_bit(CACHE_NEGATIVE, &ip.h.flags);
320 ip.h.expiry_time = expiry;
321 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
322 hash_str(ipm->m_class, IP_HASHBITS) ^
323 hash_ip6(&ipm->m_addr));
324 if (!ch)
325 return -ENOMEM;
326 cache_put(ch, cd);
327 return 0;
328}
329
330static inline int ip_map_update(struct net *net, struct ip_map *ipm,
331 struct unix_domain *udom, time_t expiry)
332{
333 struct sunrpc_net *sn;
334
335 sn = net_generic(net, sunrpc_net_id);
336 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
337}
338
339void svcauth_unix_purge(struct net *net)
340{
341 struct sunrpc_net *sn;
342
343 sn = net_generic(net, sunrpc_net_id);
344 cache_purge(sn->ip_map_cache);
345}
346EXPORT_SYMBOL_GPL(svcauth_unix_purge);
347
348static inline struct ip_map *
349ip_map_cached_get(struct svc_xprt *xprt)
350{
351 struct ip_map *ipm = NULL;
352 struct sunrpc_net *sn;
353
354 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
355 spin_lock(&xprt->xpt_lock);
356 ipm = xprt->xpt_auth_cache;
357 if (ipm != NULL) {
358 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
359 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
360 /*
361 * The entry has been invalidated since it was
362 * remembered, e.g. by a second mount from the
363 * same IP address.
364 */
365 xprt->xpt_auth_cache = NULL;
366 spin_unlock(&xprt->xpt_lock);
367 cache_put(&ipm->h, sn->ip_map_cache);
368 return NULL;
369 }
370 cache_get(&ipm->h);
371 }
372 spin_unlock(&xprt->xpt_lock);
373 }
374 return ipm;
375}
376
377static inline void
378ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
379{
380 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
381 spin_lock(&xprt->xpt_lock);
382 if (xprt->xpt_auth_cache == NULL) {
383 /* newly cached, keep the reference */
384 xprt->xpt_auth_cache = ipm;
385 ipm = NULL;
386 }
387 spin_unlock(&xprt->xpt_lock);
388 }
389 if (ipm) {
390 struct sunrpc_net *sn;
391
392 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
393 cache_put(&ipm->h, sn->ip_map_cache);
394 }
395}
396
397void
398svcauth_unix_info_release(struct svc_xprt *xpt)
399{
400 struct ip_map *ipm;
401
402 ipm = xpt->xpt_auth_cache;
403 if (ipm != NULL) {
404 struct sunrpc_net *sn;
405
406 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
407 cache_put(&ipm->h, sn->ip_map_cache);
408 }
409}
410
411/****************************************************************************
412 * auth.unix.gid cache
413 * simple cache to map a UID to a list of GIDs
414 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
415 */
416#define GID_HASHBITS 8
417#define GID_HASHMAX (1<<GID_HASHBITS)
418
419struct unix_gid {
420 struct cache_head h;
421 kuid_t uid;
422 struct group_info *gi;
423 struct rcu_head rcu;
424};
425
426static int unix_gid_hash(kuid_t uid)
427{
428 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
429}
430
431static void unix_gid_put(struct kref *kref)
432{
433 struct cache_head *item = container_of(kref, struct cache_head, ref);
434 struct unix_gid *ug = container_of(item, struct unix_gid, h);
435 if (test_bit(CACHE_VALID, &item->flags) &&
436 !test_bit(CACHE_NEGATIVE, &item->flags))
437 put_group_info(ug->gi);
438 kfree_rcu(ug, rcu);
439}
440
441static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
442{
443 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
444 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
445 return uid_eq(orig->uid, new->uid);
446}
447static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
448{
449 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
450 struct unix_gid *item = container_of(citem, struct unix_gid, h);
451 new->uid = item->uid;
452}
453static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
454{
455 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
456 struct unix_gid *item = container_of(citem, struct unix_gid, h);
457
458 get_group_info(item->gi);
459 new->gi = item->gi;
460}
461static struct cache_head *unix_gid_alloc(void)
462{
463 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
464 if (g)
465 return &g->h;
466 else
467 return NULL;
468}
469
470static void unix_gid_request(struct cache_detail *cd,
471 struct cache_head *h,
472 char **bpp, int *blen)
473{
474 char tuid[20];
475 struct unix_gid *ug = container_of(h, struct unix_gid, h);
476
477 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
478 qword_add(bpp, blen, tuid);
479 (*bpp)[-1] = '\n';
480}
481
482static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
483
484static int unix_gid_parse(struct cache_detail *cd,
485 char *mesg, int mlen)
486{
487 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
488 int id;
489 kuid_t uid;
490 int gids;
491 int rv;
492 int i;
493 int err;
494 time_t expiry;
495 struct unix_gid ug, *ugp;
496
497 if (mesg[mlen - 1] != '\n')
498 return -EINVAL;
499 mesg[mlen-1] = 0;
500
501 rv = get_int(&mesg, &id);
502 if (rv)
503 return -EINVAL;
504 uid = make_kuid(current_user_ns(), id);
505 ug.uid = uid;
506
507 expiry = get_expiry(&mesg);
508 if (expiry == 0)
509 return -EINVAL;
510
511 rv = get_int(&mesg, &gids);
512 if (rv || gids < 0 || gids > 8192)
513 return -EINVAL;
514
515 ug.gi = groups_alloc(gids);
516 if (!ug.gi)
517 return -ENOMEM;
518
519 for (i = 0 ; i < gids ; i++) {
520 int gid;
521 kgid_t kgid;
522 rv = get_int(&mesg, &gid);
523 err = -EINVAL;
524 if (rv)
525 goto out;
526 kgid = make_kgid(current_user_ns(), gid);
527 if (!gid_valid(kgid))
528 goto out;
529 ug.gi->gid[i] = kgid;
530 }
531
532 groups_sort(ug.gi);
533 ugp = unix_gid_lookup(cd, uid);
534 if (ugp) {
535 struct cache_head *ch;
536 ug.h.flags = 0;
537 ug.h.expiry_time = expiry;
538 ch = sunrpc_cache_update(cd,
539 &ug.h, &ugp->h,
540 unix_gid_hash(uid));
541 if (!ch)
542 err = -ENOMEM;
543 else {
544 err = 0;
545 cache_put(ch, cd);
546 }
547 } else
548 err = -ENOMEM;
549 out:
550 if (ug.gi)
551 put_group_info(ug.gi);
552 return err;
553}
554
555static int unix_gid_show(struct seq_file *m,
556 struct cache_detail *cd,
557 struct cache_head *h)
558{
559 struct user_namespace *user_ns = m->file->f_cred->user_ns;
560 struct unix_gid *ug;
561 int i;
562 int glen;
563
564 if (h == NULL) {
565 seq_puts(m, "#uid cnt: gids...\n");
566 return 0;
567 }
568 ug = container_of(h, struct unix_gid, h);
569 if (test_bit(CACHE_VALID, &h->flags) &&
570 !test_bit(CACHE_NEGATIVE, &h->flags))
571 glen = ug->gi->ngroups;
572 else
573 glen = 0;
574
575 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
576 for (i = 0; i < glen; i++)
577 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
578 seq_printf(m, "\n");
579 return 0;
580}
581
582static const struct cache_detail unix_gid_cache_template = {
583 .owner = THIS_MODULE,
584 .hash_size = GID_HASHMAX,
585 .name = "auth.unix.gid",
586 .cache_put = unix_gid_put,
587 .cache_request = unix_gid_request,
588 .cache_parse = unix_gid_parse,
589 .cache_show = unix_gid_show,
590 .match = unix_gid_match,
591 .init = unix_gid_init,
592 .update = unix_gid_update,
593 .alloc = unix_gid_alloc,
594};
595
596int unix_gid_cache_create(struct net *net)
597{
598 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
599 struct cache_detail *cd;
600 int err;
601
602 cd = cache_create_net(&unix_gid_cache_template, net);
603 if (IS_ERR(cd))
604 return PTR_ERR(cd);
605 err = cache_register_net(cd, net);
606 if (err) {
607 cache_destroy_net(cd, net);
608 return err;
609 }
610 sn->unix_gid_cache = cd;
611 return 0;
612}
613
614void unix_gid_cache_destroy(struct net *net)
615{
616 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
617 struct cache_detail *cd = sn->unix_gid_cache;
618
619 sn->unix_gid_cache = NULL;
620 cache_purge(cd);
621 cache_unregister_net(cd, net);
622 cache_destroy_net(cd, net);
623}
624
625static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
626{
627 struct unix_gid ug;
628 struct cache_head *ch;
629
630 ug.uid = uid;
631 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
632 if (ch)
633 return container_of(ch, struct unix_gid, h);
634 else
635 return NULL;
636}
637
638static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
639{
640 struct unix_gid *ug;
641 struct group_info *gi;
642 int ret;
643 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
644 sunrpc_net_id);
645
646 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
647 if (!ug)
648 return ERR_PTR(-EAGAIN);
649 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
650 switch (ret) {
651 case -ENOENT:
652 return ERR_PTR(-ENOENT);
653 case -ETIMEDOUT:
654 return ERR_PTR(-ESHUTDOWN);
655 case 0:
656 gi = get_group_info(ug->gi);
657 cache_put(&ug->h, sn->unix_gid_cache);
658 return gi;
659 default:
660 return ERR_PTR(-EAGAIN);
661 }
662}
663
664int
665svcauth_unix_set_client(struct svc_rqst *rqstp)
666{
667 struct sockaddr_in *sin;
668 struct sockaddr_in6 *sin6, sin6_storage;
669 struct ip_map *ipm;
670 struct group_info *gi;
671 struct svc_cred *cred = &rqstp->rq_cred;
672 struct svc_xprt *xprt = rqstp->rq_xprt;
673 struct net *net = xprt->xpt_net;
674 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
675
676 switch (rqstp->rq_addr.ss_family) {
677 case AF_INET:
678 sin = svc_addr_in(rqstp);
679 sin6 = &sin6_storage;
680 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
681 break;
682 case AF_INET6:
683 sin6 = svc_addr_in6(rqstp);
684 break;
685 default:
686 BUG();
687 }
688
689 rqstp->rq_client = NULL;
690 if (rqstp->rq_proc == 0)
691 return SVC_OK;
692
693 ipm = ip_map_cached_get(xprt);
694 if (ipm == NULL)
695 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
696 &sin6->sin6_addr);
697
698 if (ipm == NULL)
699 return SVC_DENIED;
700
701 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
702 default:
703 BUG();
704 case -ETIMEDOUT:
705 return SVC_CLOSE;
706 case -EAGAIN:
707 return SVC_DROP;
708 case -ENOENT:
709 return SVC_DENIED;
710 case 0:
711 rqstp->rq_client = &ipm->m_client->h;
712 kref_get(&rqstp->rq_client->ref);
713 ip_map_cached_put(xprt, ipm);
714 break;
715 }
716
717 gi = unix_gid_find(cred->cr_uid, rqstp);
718 switch (PTR_ERR(gi)) {
719 case -EAGAIN:
720 return SVC_DROP;
721 case -ESHUTDOWN:
722 return SVC_CLOSE;
723 case -ENOENT:
724 break;
725 default:
726 put_group_info(cred->cr_group_info);
727 cred->cr_group_info = gi;
728 }
729 return SVC_OK;
730}
731
732EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
733
734static int
735svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
736{
737 struct kvec *argv = &rqstp->rq_arg.head[0];
738 struct kvec *resv = &rqstp->rq_res.head[0];
739 struct svc_cred *cred = &rqstp->rq_cred;
740
741 if (argv->iov_len < 3*4)
742 return SVC_GARBAGE;
743
744 if (svc_getu32(argv) != 0) {
745 dprintk("svc: bad null cred\n");
746 *authp = rpc_autherr_badcred;
747 return SVC_DENIED;
748 }
749 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
750 dprintk("svc: bad null verf\n");
751 *authp = rpc_autherr_badverf;
752 return SVC_DENIED;
753 }
754
755 /* Signal that mapping to nobody uid/gid is required */
756 cred->cr_uid = INVALID_UID;
757 cred->cr_gid = INVALID_GID;
758 cred->cr_group_info = groups_alloc(0);
759 if (cred->cr_group_info == NULL)
760 return SVC_CLOSE; /* kmalloc failure - client must retry */
761
762 /* Put NULL verifier */
763 svc_putnl(resv, RPC_AUTH_NULL);
764 svc_putnl(resv, 0);
765
766 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
767 return SVC_OK;
768}
769
770static int
771svcauth_null_release(struct svc_rqst *rqstp)
772{
773 if (rqstp->rq_client)
774 auth_domain_put(rqstp->rq_client);
775 rqstp->rq_client = NULL;
776 if (rqstp->rq_cred.cr_group_info)
777 put_group_info(rqstp->rq_cred.cr_group_info);
778 rqstp->rq_cred.cr_group_info = NULL;
779
780 return 0; /* don't drop */
781}
782
783
784struct auth_ops svcauth_null = {
785 .name = "null",
786 .owner = THIS_MODULE,
787 .flavour = RPC_AUTH_NULL,
788 .accept = svcauth_null_accept,
789 .release = svcauth_null_release,
790 .set_client = svcauth_unix_set_client,
791};
792
793
794static int
795svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
796{
797 struct kvec *argv = &rqstp->rq_arg.head[0];
798 struct kvec *resv = &rqstp->rq_res.head[0];
799 struct svc_cred *cred = &rqstp->rq_cred;
800 struct user_namespace *userns;
801 u32 slen, i;
802 int len = argv->iov_len;
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 * Note: we skip uid_valid()/gid_valid() checks here for
816 * backwards compatibility with clients that use -1 id's.
817 * Instead, -1 uid or gid is later mapped to the
818 * (export-specific) anonymous id by nfsd_setuser.
819 * Supplementary gid's will be left alone.
820 */
821 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
822 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
823 cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
824 cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
825 slen = svc_getnl(argv); /* gids length */
826 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
827 goto badcred;
828 cred->cr_group_info = groups_alloc(slen);
829 if (cred->cr_group_info == NULL)
830 return SVC_CLOSE;
831 for (i = 0; i < slen; i++) {
832 kgid_t kgid = make_kgid(userns, svc_getnl(argv));
833 cred->cr_group_info->gid[i] = kgid;
834 }
835 groups_sort(cred->cr_group_info);
836 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
837 *authp = rpc_autherr_badverf;
838 return SVC_DENIED;
839 }
840
841 /* Put NULL verifier */
842 svc_putnl(resv, RPC_AUTH_NULL);
843 svc_putnl(resv, 0);
844
845 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
846 return SVC_OK;
847
848badcred:
849 *authp = rpc_autherr_badcred;
850 return SVC_DENIED;
851}
852
853static int
854svcauth_unix_release(struct svc_rqst *rqstp)
855{
856 /* Verifier (such as it is) is already in place.
857 */
858 if (rqstp->rq_client)
859 auth_domain_put(rqstp->rq_client);
860 rqstp->rq_client = NULL;
861 if (rqstp->rq_cred.cr_group_info)
862 put_group_info(rqstp->rq_cred.cr_group_info);
863 rqstp->rq_cred.cr_group_info = NULL;
864
865 return 0;
866}
867
868
869struct auth_ops svcauth_unix = {
870 .name = "unix",
871 .owner = THIS_MODULE,
872 .flavour = RPC_AUTH_UNIX,
873 .accept = svcauth_unix_accept,
874 .release = svcauth_unix_release,
875 .domain_release = svcauth_unix_domain_release,
876 .set_client = svcauth_unix_set_client,
877};
878
879static const struct cache_detail ip_map_cache_template = {
880 .owner = THIS_MODULE,
881 .hash_size = IP_HASHMAX,
882 .name = "auth.unix.ip",
883 .cache_put = ip_map_put,
884 .cache_request = ip_map_request,
885 .cache_parse = ip_map_parse,
886 .cache_show = ip_map_show,
887 .match = ip_map_match,
888 .init = ip_map_init,
889 .update = update,
890 .alloc = ip_map_alloc,
891};
892
893int ip_map_cache_create(struct net *net)
894{
895 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
896 struct cache_detail *cd;
897 int err;
898
899 cd = cache_create_net(&ip_map_cache_template, net);
900 if (IS_ERR(cd))
901 return PTR_ERR(cd);
902 err = cache_register_net(cd, net);
903 if (err) {
904 cache_destroy_net(cd, net);
905 return err;
906 }
907 sn->ip_map_cache = cd;
908 return 0;
909}
910
911void ip_map_cache_destroy(struct net *net)
912{
913 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
914 struct cache_detail *cd = sn->ip_map_cache;
915
916 sn->ip_map_cache = NULL;
917 cache_purge(cd);
918 cache_unregister_net(cd, net);
919 cache_destroy_net(cd, net);
920}
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
32struct unix_domain {
33 struct auth_domain h;
34 /* other stuff later */
35};
36
37extern struct auth_ops svcauth_null;
38extern struct auth_ops svcauth_unix;
39
40static 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
48struct 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}
79EXPORT_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
89struct 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
96static 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
107static inline int hash_ip6(const struct in6_addr *ip)
108{
109 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
110}
111static 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}
118static 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}
126static 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}
134static 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
143static 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
160static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
161static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
162
163static 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
245static 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
275static 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
293static 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
302static 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
322static 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
331void 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}
338EXPORT_SYMBOL_GPL(svcauth_unix_purge);
339
340static inline struct ip_map *
341ip_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 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
351 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
352 /*
353 * The entry has been invalidated since it was
354 * remembered, e.g. by a second mount from the
355 * same IP address.
356 */
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
369static inline void
370ip_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
389void
390svcauth_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 UNX_NGROUPS
407 */
408#define GID_HASHBITS 8
409#define GID_HASHMAX (1<<GID_HASHBITS)
410
411struct unix_gid {
412 struct cache_head h;
413 kuid_t uid;
414 struct group_info *gi;
415};
416
417static int unix_gid_hash(kuid_t uid)
418{
419 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
420}
421
422static 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
432static 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 uid_eq(orig->uid, new->uid);
437}
438static 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}
444static 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}
452static 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
461static 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", from_kuid(&init_user_ns, ug->uid));
469 qword_add(bpp, blen, tuid);
470 (*bpp)[-1] = '\n';
471}
472
473static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
474
475static int unix_gid_parse(struct cache_detail *cd,
476 char *mesg, int mlen)
477{
478 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
479 int id;
480 kuid_t uid;
481 int gids;
482 int rv;
483 int i;
484 int err;
485 time_t expiry;
486 struct unix_gid ug, *ugp;
487
488 if (mesg[mlen - 1] != '\n')
489 return -EINVAL;
490 mesg[mlen-1] = 0;
491
492 rv = get_int(&mesg, &id);
493 if (rv)
494 return -EINVAL;
495 uid = make_kuid(&init_user_ns, id);
496 ug.uid = uid;
497
498 expiry = get_expiry(&mesg);
499 if (expiry == 0)
500 return -EINVAL;
501
502 rv = get_int(&mesg, &gids);
503 if (rv || gids < 0 || gids > 8192)
504 return -EINVAL;
505
506 ug.gi = groups_alloc(gids);
507 if (!ug.gi)
508 return -ENOMEM;
509
510 for (i = 0 ; i < gids ; i++) {
511 int gid;
512 kgid_t kgid;
513 rv = get_int(&mesg, &gid);
514 err = -EINVAL;
515 if (rv)
516 goto out;
517 kgid = make_kgid(&init_user_ns, gid);
518 if (!gid_valid(kgid))
519 goto out;
520 ug.gi->gid[i] = kgid;
521 }
522
523 groups_sort(ug.gi);
524 ugp = unix_gid_lookup(cd, uid);
525 if (ugp) {
526 struct cache_head *ch;
527 ug.h.flags = 0;
528 ug.h.expiry_time = expiry;
529 ch = sunrpc_cache_update(cd,
530 &ug.h, &ugp->h,
531 unix_gid_hash(uid));
532 if (!ch)
533 err = -ENOMEM;
534 else {
535 err = 0;
536 cache_put(ch, cd);
537 }
538 } else
539 err = -ENOMEM;
540 out:
541 if (ug.gi)
542 put_group_info(ug.gi);
543 return err;
544}
545
546static int unix_gid_show(struct seq_file *m,
547 struct cache_detail *cd,
548 struct cache_head *h)
549{
550 struct user_namespace *user_ns = &init_user_ns;
551 struct unix_gid *ug;
552 int i;
553 int glen;
554
555 if (h == NULL) {
556 seq_puts(m, "#uid cnt: gids...\n");
557 return 0;
558 }
559 ug = container_of(h, struct unix_gid, h);
560 if (test_bit(CACHE_VALID, &h->flags) &&
561 !test_bit(CACHE_NEGATIVE, &h->flags))
562 glen = ug->gi->ngroups;
563 else
564 glen = 0;
565
566 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
567 for (i = 0; i < glen; i++)
568 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
569 seq_printf(m, "\n");
570 return 0;
571}
572
573static const struct cache_detail unix_gid_cache_template = {
574 .owner = THIS_MODULE,
575 .hash_size = GID_HASHMAX,
576 .name = "auth.unix.gid",
577 .cache_put = unix_gid_put,
578 .cache_request = unix_gid_request,
579 .cache_parse = unix_gid_parse,
580 .cache_show = unix_gid_show,
581 .match = unix_gid_match,
582 .init = unix_gid_init,
583 .update = unix_gid_update,
584 .alloc = unix_gid_alloc,
585};
586
587int unix_gid_cache_create(struct net *net)
588{
589 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
590 struct cache_detail *cd;
591 int err;
592
593 cd = cache_create_net(&unix_gid_cache_template, net);
594 if (IS_ERR(cd))
595 return PTR_ERR(cd);
596 err = cache_register_net(cd, net);
597 if (err) {
598 cache_destroy_net(cd, net);
599 return err;
600 }
601 sn->unix_gid_cache = cd;
602 return 0;
603}
604
605void unix_gid_cache_destroy(struct net *net)
606{
607 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
608 struct cache_detail *cd = sn->unix_gid_cache;
609
610 sn->unix_gid_cache = NULL;
611 cache_purge(cd);
612 cache_unregister_net(cd, net);
613 cache_destroy_net(cd, net);
614}
615
616static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
617{
618 struct unix_gid ug;
619 struct cache_head *ch;
620
621 ug.uid = uid;
622 ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
623 if (ch)
624 return container_of(ch, struct unix_gid, h);
625 else
626 return NULL;
627}
628
629static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
630{
631 struct unix_gid *ug;
632 struct group_info *gi;
633 int ret;
634 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
635 sunrpc_net_id);
636
637 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
638 if (!ug)
639 return ERR_PTR(-EAGAIN);
640 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
641 switch (ret) {
642 case -ENOENT:
643 return ERR_PTR(-ENOENT);
644 case -ETIMEDOUT:
645 return ERR_PTR(-ESHUTDOWN);
646 case 0:
647 gi = get_group_info(ug->gi);
648 cache_put(&ug->h, sn->unix_gid_cache);
649 return gi;
650 default:
651 return ERR_PTR(-EAGAIN);
652 }
653}
654
655int
656svcauth_unix_set_client(struct svc_rqst *rqstp)
657{
658 struct sockaddr_in *sin;
659 struct sockaddr_in6 *sin6, sin6_storage;
660 struct ip_map *ipm;
661 struct group_info *gi;
662 struct svc_cred *cred = &rqstp->rq_cred;
663 struct svc_xprt *xprt = rqstp->rq_xprt;
664 struct net *net = xprt->xpt_net;
665 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
666
667 switch (rqstp->rq_addr.ss_family) {
668 case AF_INET:
669 sin = svc_addr_in(rqstp);
670 sin6 = &sin6_storage;
671 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
672 break;
673 case AF_INET6:
674 sin6 = svc_addr_in6(rqstp);
675 break;
676 default:
677 BUG();
678 }
679
680 rqstp->rq_client = NULL;
681 if (rqstp->rq_proc == 0)
682 return SVC_OK;
683
684 ipm = ip_map_cached_get(xprt);
685 if (ipm == NULL)
686 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
687 &sin6->sin6_addr);
688
689 if (ipm == NULL)
690 return SVC_DENIED;
691
692 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
693 default:
694 BUG();
695 case -ETIMEDOUT:
696 return SVC_CLOSE;
697 case -EAGAIN:
698 return SVC_DROP;
699 case -ENOENT:
700 return SVC_DENIED;
701 case 0:
702 rqstp->rq_client = &ipm->m_client->h;
703 kref_get(&rqstp->rq_client->ref);
704 ip_map_cached_put(xprt, ipm);
705 break;
706 }
707
708 gi = unix_gid_find(cred->cr_uid, rqstp);
709 switch (PTR_ERR(gi)) {
710 case -EAGAIN:
711 return SVC_DROP;
712 case -ESHUTDOWN:
713 return SVC_CLOSE;
714 case -ENOENT:
715 break;
716 default:
717 put_group_info(cred->cr_group_info);
718 cred->cr_group_info = gi;
719 }
720 return SVC_OK;
721}
722
723EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
724
725static int
726svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
727{
728 struct kvec *argv = &rqstp->rq_arg.head[0];
729 struct kvec *resv = &rqstp->rq_res.head[0];
730 struct svc_cred *cred = &rqstp->rq_cred;
731
732 if (argv->iov_len < 3*4)
733 return SVC_GARBAGE;
734
735 if (svc_getu32(argv) != 0) {
736 dprintk("svc: bad null cred\n");
737 *authp = rpc_autherr_badcred;
738 return SVC_DENIED;
739 }
740 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
741 dprintk("svc: bad null verf\n");
742 *authp = rpc_autherr_badverf;
743 return SVC_DENIED;
744 }
745
746 /* Signal that mapping to nobody uid/gid is required */
747 cred->cr_uid = INVALID_UID;
748 cred->cr_gid = INVALID_GID;
749 cred->cr_group_info = groups_alloc(0);
750 if (cred->cr_group_info == NULL)
751 return SVC_CLOSE; /* kmalloc failure - client must retry */
752
753 /* Put NULL verifier */
754 svc_putnl(resv, RPC_AUTH_NULL);
755 svc_putnl(resv, 0);
756
757 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
758 return SVC_OK;
759}
760
761static int
762svcauth_null_release(struct svc_rqst *rqstp)
763{
764 if (rqstp->rq_client)
765 auth_domain_put(rqstp->rq_client);
766 rqstp->rq_client = NULL;
767 if (rqstp->rq_cred.cr_group_info)
768 put_group_info(rqstp->rq_cred.cr_group_info);
769 rqstp->rq_cred.cr_group_info = NULL;
770
771 return 0; /* don't drop */
772}
773
774
775struct auth_ops svcauth_null = {
776 .name = "null",
777 .owner = THIS_MODULE,
778 .flavour = RPC_AUTH_NULL,
779 .accept = svcauth_null_accept,
780 .release = svcauth_null_release,
781 .set_client = svcauth_unix_set_client,
782};
783
784
785static int
786svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
787{
788 struct kvec *argv = &rqstp->rq_arg.head[0];
789 struct kvec *resv = &rqstp->rq_res.head[0];
790 struct svc_cred *cred = &rqstp->rq_cred;
791 u32 slen, i;
792 int len = argv->iov_len;
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 * Note: we skip uid_valid()/gid_valid() checks here for
806 * backwards compatibility with clients that use -1 id's.
807 * Instead, -1 uid or gid is later mapped to the
808 * (export-specific) anonymous id by nfsd_setuser.
809 * Supplementary gid's will be left alone.
810 */
811 cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
812 cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
813 slen = svc_getnl(argv); /* gids length */
814 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
815 goto badcred;
816 cred->cr_group_info = groups_alloc(slen);
817 if (cred->cr_group_info == NULL)
818 return SVC_CLOSE;
819 for (i = 0; i < slen; i++) {
820 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
821 cred->cr_group_info->gid[i] = kgid;
822 }
823 groups_sort(cred->cr_group_info);
824 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
825 *authp = rpc_autherr_badverf;
826 return SVC_DENIED;
827 }
828
829 /* Put NULL verifier */
830 svc_putnl(resv, RPC_AUTH_NULL);
831 svc_putnl(resv, 0);
832
833 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
834 return SVC_OK;
835
836badcred:
837 *authp = rpc_autherr_badcred;
838 return SVC_DENIED;
839}
840
841static int
842svcauth_unix_release(struct svc_rqst *rqstp)
843{
844 /* Verifier (such as it is) is already in place.
845 */
846 if (rqstp->rq_client)
847 auth_domain_put(rqstp->rq_client);
848 rqstp->rq_client = NULL;
849 if (rqstp->rq_cred.cr_group_info)
850 put_group_info(rqstp->rq_cred.cr_group_info);
851 rqstp->rq_cred.cr_group_info = NULL;
852
853 return 0;
854}
855
856
857struct auth_ops svcauth_unix = {
858 .name = "unix",
859 .owner = THIS_MODULE,
860 .flavour = RPC_AUTH_UNIX,
861 .accept = svcauth_unix_accept,
862 .release = svcauth_unix_release,
863 .domain_release = svcauth_unix_domain_release,
864 .set_client = svcauth_unix_set_client,
865};
866
867static const struct cache_detail ip_map_cache_template = {
868 .owner = THIS_MODULE,
869 .hash_size = IP_HASHMAX,
870 .name = "auth.unix.ip",
871 .cache_put = ip_map_put,
872 .cache_request = ip_map_request,
873 .cache_parse = ip_map_parse,
874 .cache_show = ip_map_show,
875 .match = ip_map_match,
876 .init = ip_map_init,
877 .update = update,
878 .alloc = ip_map_alloc,
879};
880
881int ip_map_cache_create(struct net *net)
882{
883 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
884 struct cache_detail *cd;
885 int err;
886
887 cd = cache_create_net(&ip_map_cache_template, net);
888 if (IS_ERR(cd))
889 return PTR_ERR(cd);
890 err = cache_register_net(cd, net);
891 if (err) {
892 cache_destroy_net(cd, net);
893 return err;
894 }
895 sn->ip_map_cache = cd;
896 return 0;
897}
898
899void ip_map_cache_destroy(struct net *net)
900{
901 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
902 struct cache_detail *cd = sn->ip_map_cache;
903
904 sn->ip_map_cache = NULL;
905 cache_purge(cd);
906 cache_unregister_net(cd, net);
907 cache_destroy_net(cd, net);
908}