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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// 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 int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
152{
153 return sunrpc_cache_pipe_upcall(cd, h);
154}
155
156static void ip_map_request(struct cache_detail *cd,
157 struct cache_head *h,
158 char **bpp, int *blen)
159{
160 char text_addr[40];
161 struct ip_map *im = container_of(h, struct ip_map, h);
162
163 if (ipv6_addr_v4mapped(&(im->m_addr))) {
164 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
165 } else {
166 snprintf(text_addr, 40, "%pI6", &im->m_addr);
167 }
168 qword_add(bpp, blen, im->m_class);
169 qword_add(bpp, blen, text_addr);
170 (*bpp)[-1] = '\n';
171}
172
173static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
174static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
175
176static int ip_map_parse(struct cache_detail *cd,
177 char *mesg, int mlen)
178{
179 /* class ipaddress [domainname] */
180 /* should be safe just to use the start of the input buffer
181 * for scratch: */
182 char *buf = mesg;
183 int len;
184 char class[8];
185 union {
186 struct sockaddr sa;
187 struct sockaddr_in s4;
188 struct sockaddr_in6 s6;
189 } address;
190 struct sockaddr_in6 sin6;
191 int err;
192
193 struct ip_map *ipmp;
194 struct auth_domain *dom;
195 time64_t expiry;
196
197 if (mesg[mlen-1] != '\n')
198 return -EINVAL;
199 mesg[mlen-1] = 0;
200
201 /* class */
202 len = qword_get(&mesg, class, sizeof(class));
203 if (len <= 0) return -EINVAL;
204
205 /* ip address */
206 len = qword_get(&mesg, buf, mlen);
207 if (len <= 0) return -EINVAL;
208
209 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
210 return -EINVAL;
211 switch (address.sa.sa_family) {
212 case AF_INET:
213 /* Form a mapped IPv4 address in sin6 */
214 sin6.sin6_family = AF_INET6;
215 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
216 &sin6.sin6_addr);
217 break;
218#if IS_ENABLED(CONFIG_IPV6)
219 case AF_INET6:
220 memcpy(&sin6, &address.s6, sizeof(sin6));
221 break;
222#endif
223 default:
224 return -EINVAL;
225 }
226
227 expiry = get_expiry(&mesg);
228 if (expiry ==0)
229 return -EINVAL;
230
231 /* domainname, or empty for NEGATIVE */
232 len = qword_get(&mesg, buf, mlen);
233 if (len < 0) return -EINVAL;
234
235 if (len) {
236 dom = unix_domain_find(buf);
237 if (dom == NULL)
238 return -ENOENT;
239 } else
240 dom = NULL;
241
242 /* IPv6 scope IDs are ignored for now */
243 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
244 if (ipmp) {
245 err = __ip_map_update(cd, ipmp,
246 container_of(dom, struct unix_domain, h),
247 expiry);
248 } else
249 err = -ENOMEM;
250
251 if (dom)
252 auth_domain_put(dom);
253
254 cache_flush();
255 return err;
256}
257
258static int ip_map_show(struct seq_file *m,
259 struct cache_detail *cd,
260 struct cache_head *h)
261{
262 struct ip_map *im;
263 struct in6_addr addr;
264 char *dom = "-no-domain-";
265
266 if (h == NULL) {
267 seq_puts(m, "#class IP domain\n");
268 return 0;
269 }
270 im = container_of(h, struct ip_map, h);
271 /* class addr domain */
272 addr = im->m_addr;
273
274 if (test_bit(CACHE_VALID, &h->flags) &&
275 !test_bit(CACHE_NEGATIVE, &h->flags))
276 dom = im->m_client->h.name;
277
278 if (ipv6_addr_v4mapped(&addr)) {
279 seq_printf(m, "%s %pI4 %s\n",
280 im->m_class, &addr.s6_addr32[3], dom);
281 } else {
282 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
283 }
284 return 0;
285}
286
287
288static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
289 struct in6_addr *addr)
290{
291 struct ip_map ip;
292 struct cache_head *ch;
293
294 strcpy(ip.m_class, class);
295 ip.m_addr = *addr;
296 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
297 hash_str(class, IP_HASHBITS) ^
298 hash_ip6(addr));
299
300 if (ch)
301 return container_of(ch, struct ip_map, h);
302 else
303 return NULL;
304}
305
306static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
307 struct unix_domain *udom, time64_t expiry)
308{
309 struct ip_map ip;
310 struct cache_head *ch;
311
312 ip.m_client = udom;
313 ip.h.flags = 0;
314 if (!udom)
315 set_bit(CACHE_NEGATIVE, &ip.h.flags);
316 ip.h.expiry_time = expiry;
317 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
318 hash_str(ipm->m_class, IP_HASHBITS) ^
319 hash_ip6(&ipm->m_addr));
320 if (!ch)
321 return -ENOMEM;
322 cache_put(ch, cd);
323 return 0;
324}
325
326void svcauth_unix_purge(struct net *net)
327{
328 struct sunrpc_net *sn;
329
330 sn = net_generic(net, sunrpc_net_id);
331 cache_purge(sn->ip_map_cache);
332}
333EXPORT_SYMBOL_GPL(svcauth_unix_purge);
334
335static inline struct ip_map *
336ip_map_cached_get(struct svc_xprt *xprt)
337{
338 struct ip_map *ipm = NULL;
339 struct sunrpc_net *sn;
340
341 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
342 spin_lock(&xprt->xpt_lock);
343 ipm = xprt->xpt_auth_cache;
344 if (ipm != NULL) {
345 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
346 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
347 /*
348 * The entry has been invalidated since it was
349 * remembered, e.g. by a second mount from the
350 * same IP address.
351 */
352 xprt->xpt_auth_cache = NULL;
353 spin_unlock(&xprt->xpt_lock);
354 cache_put(&ipm->h, sn->ip_map_cache);
355 return NULL;
356 }
357 cache_get(&ipm->h);
358 }
359 spin_unlock(&xprt->xpt_lock);
360 }
361 return ipm;
362}
363
364static inline void
365ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
366{
367 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
368 spin_lock(&xprt->xpt_lock);
369 if (xprt->xpt_auth_cache == NULL) {
370 /* newly cached, keep the reference */
371 xprt->xpt_auth_cache = ipm;
372 ipm = NULL;
373 }
374 spin_unlock(&xprt->xpt_lock);
375 }
376 if (ipm) {
377 struct sunrpc_net *sn;
378
379 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
380 cache_put(&ipm->h, sn->ip_map_cache);
381 }
382}
383
384void
385svcauth_unix_info_release(struct svc_xprt *xpt)
386{
387 struct ip_map *ipm;
388
389 ipm = xpt->xpt_auth_cache;
390 if (ipm != NULL) {
391 struct sunrpc_net *sn;
392
393 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
394 cache_put(&ipm->h, sn->ip_map_cache);
395 }
396}
397
398/****************************************************************************
399 * auth.unix.gid cache
400 * simple cache to map a UID to a list of GIDs
401 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
402 */
403#define GID_HASHBITS 8
404#define GID_HASHMAX (1<<GID_HASHBITS)
405
406struct unix_gid {
407 struct cache_head h;
408 kuid_t uid;
409 struct group_info *gi;
410 struct rcu_head rcu;
411};
412
413static int unix_gid_hash(kuid_t uid)
414{
415 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
416}
417
418static void unix_gid_put(struct kref *kref)
419{
420 struct cache_head *item = container_of(kref, struct cache_head, ref);
421 struct unix_gid *ug = container_of(item, struct unix_gid, h);
422 if (test_bit(CACHE_VALID, &item->flags) &&
423 !test_bit(CACHE_NEGATIVE, &item->flags))
424 put_group_info(ug->gi);
425 kfree_rcu(ug, rcu);
426}
427
428static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
429{
430 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
431 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
432 return uid_eq(orig->uid, new->uid);
433}
434static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
435{
436 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
437 struct unix_gid *item = container_of(citem, struct unix_gid, h);
438 new->uid = item->uid;
439}
440static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
441{
442 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
443 struct unix_gid *item = container_of(citem, struct unix_gid, h);
444
445 get_group_info(item->gi);
446 new->gi = item->gi;
447}
448static struct cache_head *unix_gid_alloc(void)
449{
450 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
451 if (g)
452 return &g->h;
453 else
454 return NULL;
455}
456
457static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
458{
459 return sunrpc_cache_pipe_upcall_timeout(cd, h);
460}
461
462static void unix_gid_request(struct cache_detail *cd,
463 struct cache_head *h,
464 char **bpp, int *blen)
465{
466 char tuid[20];
467 struct unix_gid *ug = container_of(h, struct unix_gid, h);
468
469 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
470 qword_add(bpp, blen, tuid);
471 (*bpp)[-1] = '\n';
472}
473
474static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
475
476static int unix_gid_parse(struct cache_detail *cd,
477 char *mesg, int mlen)
478{
479 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
480 int id;
481 kuid_t uid;
482 int gids;
483 int rv;
484 int i;
485 int err;
486 time64_t expiry;
487 struct unix_gid ug, *ugp;
488
489 if (mesg[mlen - 1] != '\n')
490 return -EINVAL;
491 mesg[mlen-1] = 0;
492
493 rv = get_int(&mesg, &id);
494 if (rv)
495 return -EINVAL;
496 uid = make_kuid(current_user_ns(), id);
497 ug.uid = uid;
498
499 expiry = get_expiry(&mesg);
500 if (expiry == 0)
501 return -EINVAL;
502
503 rv = get_int(&mesg, &gids);
504 if (rv || gids < 0 || gids > 8192)
505 return -EINVAL;
506
507 ug.gi = groups_alloc(gids);
508 if (!ug.gi)
509 return -ENOMEM;
510
511 for (i = 0 ; i < gids ; i++) {
512 int gid;
513 kgid_t kgid;
514 rv = get_int(&mesg, &gid);
515 err = -EINVAL;
516 if (rv)
517 goto out;
518 kgid = make_kgid(current_user_ns(), gid);
519 if (!gid_valid(kgid))
520 goto out;
521 ug.gi->gid[i] = kgid;
522 }
523
524 groups_sort(ug.gi);
525 ugp = unix_gid_lookup(cd, uid);
526 if (ugp) {
527 struct cache_head *ch;
528 ug.h.flags = 0;
529 ug.h.expiry_time = expiry;
530 ch = sunrpc_cache_update(cd,
531 &ug.h, &ugp->h,
532 unix_gid_hash(uid));
533 if (!ch)
534 err = -ENOMEM;
535 else {
536 err = 0;
537 cache_put(ch, cd);
538 }
539 } else
540 err = -ENOMEM;
541 out:
542 if (ug.gi)
543 put_group_info(ug.gi);
544 return err;
545}
546
547static int unix_gid_show(struct seq_file *m,
548 struct cache_detail *cd,
549 struct cache_head *h)
550{
551 struct user_namespace *user_ns = m->file->f_cred->user_ns;
552 struct unix_gid *ug;
553 int i;
554 int glen;
555
556 if (h == NULL) {
557 seq_puts(m, "#uid cnt: gids...\n");
558 return 0;
559 }
560 ug = container_of(h, struct unix_gid, h);
561 if (test_bit(CACHE_VALID, &h->flags) &&
562 !test_bit(CACHE_NEGATIVE, &h->flags))
563 glen = ug->gi->ngroups;
564 else
565 glen = 0;
566
567 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
568 for (i = 0; i < glen; i++)
569 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
570 seq_printf(m, "\n");
571 return 0;
572}
573
574static const struct cache_detail unix_gid_cache_template = {
575 .owner = THIS_MODULE,
576 .hash_size = GID_HASHMAX,
577 .name = "auth.unix.gid",
578 .cache_put = unix_gid_put,
579 .cache_upcall = unix_gid_upcall,
580 .cache_request = unix_gid_request,
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
589int 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
607void 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
618static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
619{
620 struct unix_gid ug;
621 struct cache_head *ch;
622
623 ug.uid = uid;
624 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
625 if (ch)
626 return container_of(ch, struct unix_gid, h);
627 else
628 return NULL;
629}
630
631static struct group_info *unix_gid_find(kuid_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
657int
658svcauth_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
725EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
726
727static int
728svcauth_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 if (argv->iov_len < 3*4)
735 return SVC_GARBAGE;
736
737 if (svc_getu32(argv) != 0) {
738 dprintk("svc: bad null cred\n");
739 *authp = rpc_autherr_badcred;
740 return SVC_DENIED;
741 }
742 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
743 dprintk("svc: bad null verf\n");
744 *authp = rpc_autherr_badverf;
745 return SVC_DENIED;
746 }
747
748 /* Signal that mapping to nobody uid/gid is required */
749 cred->cr_uid = INVALID_UID;
750 cred->cr_gid = INVALID_GID;
751 cred->cr_group_info = groups_alloc(0);
752 if (cred->cr_group_info == NULL)
753 return SVC_CLOSE; /* kmalloc failure - client must retry */
754
755 /* Put NULL verifier */
756 svc_putnl(resv, RPC_AUTH_NULL);
757 svc_putnl(resv, 0);
758
759 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
760 return SVC_OK;
761}
762
763static int
764svcauth_null_release(struct svc_rqst *rqstp)
765{
766 if (rqstp->rq_client)
767 auth_domain_put(rqstp->rq_client);
768 rqstp->rq_client = NULL;
769 if (rqstp->rq_cred.cr_group_info)
770 put_group_info(rqstp->rq_cred.cr_group_info);
771 rqstp->rq_cred.cr_group_info = NULL;
772
773 return 0; /* don't drop */
774}
775
776
777struct auth_ops svcauth_null = {
778 .name = "null",
779 .owner = THIS_MODULE,
780 .flavour = RPC_AUTH_NULL,
781 .accept = svcauth_null_accept,
782 .release = svcauth_null_release,
783 .set_client = svcauth_unix_set_client,
784};
785
786
787static int
788svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
789{
790 struct kvec *argv = &rqstp->rq_arg.head[0];
791 struct kvec *resv = &rqstp->rq_res.head[0];
792 struct svc_cred *cred = &rqstp->rq_cred;
793 struct user_namespace *userns;
794 u32 slen, i;
795 int len = argv->iov_len;
796
797 if ((len -= 3*4) < 0)
798 return SVC_GARBAGE;
799
800 svc_getu32(argv); /* length */
801 svc_getu32(argv); /* time stamp */
802 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
803 if (slen > 64 || (len -= (slen + 3)*4) < 0)
804 goto badcred;
805 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
806 argv->iov_len -= slen*4;
807 /*
808 * Note: we skip uid_valid()/gid_valid() checks here for
809 * backwards compatibility with clients that use -1 id's.
810 * Instead, -1 uid or gid is later mapped to the
811 * (export-specific) anonymous id by nfsd_setuser.
812 * Supplementary gid's will be left alone.
813 */
814 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
815 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
816 cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
817 cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
818 slen = svc_getnl(argv); /* gids length */
819 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
820 goto badcred;
821 cred->cr_group_info = groups_alloc(slen);
822 if (cred->cr_group_info == NULL)
823 return SVC_CLOSE;
824 for (i = 0; i < slen; i++) {
825 kgid_t kgid = make_kgid(userns, svc_getnl(argv));
826 cred->cr_group_info->gid[i] = kgid;
827 }
828 groups_sort(cred->cr_group_info);
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
841badcred:
842 *authp = rpc_autherr_badcred;
843 return SVC_DENIED;
844}
845
846static int
847svcauth_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
862struct 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
872static const 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_request = ip_map_request,
879 .cache_parse = ip_map_parse,
880 .cache_show = ip_map_show,
881 .match = ip_map_match,
882 .init = ip_map_init,
883 .update = update,
884 .alloc = ip_map_alloc,
885};
886
887int ip_map_cache_create(struct net *net)
888{
889 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
890 struct cache_detail *cd;
891 int err;
892
893 cd = cache_create_net(&ip_map_cache_template, net);
894 if (IS_ERR(cd))
895 return PTR_ERR(cd);
896 err = cache_register_net(cd, net);
897 if (err) {
898 cache_destroy_net(cd, net);
899 return err;
900 }
901 sn->ip_map_cache = cd;
902 return 0;
903}
904
905void ip_map_cache_destroy(struct net *net)
906{
907 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
908 struct cache_detail *cd = sn->ip_map_cache;
909
910 sn->ip_map_cache = NULL;
911 cache_purge(cd);
912 cache_unregister_net(cd, net);
913 cache_destroy_net(cd, net);
914}