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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 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 inline struct ip_map *ip_map_lookup(struct net *net, char *class,
307 struct in6_addr *addr)
308{
309 struct sunrpc_net *sn;
310
311 sn = net_generic(net, sunrpc_net_id);
312 return __ip_map_lookup(sn->ip_map_cache, class, addr);
313}
314
315static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
316 struct unix_domain *udom, time64_t expiry)
317{
318 struct ip_map ip;
319 struct cache_head *ch;
320
321 ip.m_client = udom;
322 ip.h.flags = 0;
323 if (!udom)
324 set_bit(CACHE_NEGATIVE, &ip.h.flags);
325 ip.h.expiry_time = expiry;
326 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
327 hash_str(ipm->m_class, IP_HASHBITS) ^
328 hash_ip6(&ipm->m_addr));
329 if (!ch)
330 return -ENOMEM;
331 cache_put(ch, cd);
332 return 0;
333}
334
335void svcauth_unix_purge(struct net *net)
336{
337 struct sunrpc_net *sn;
338
339 sn = net_generic(net, sunrpc_net_id);
340 cache_purge(sn->ip_map_cache);
341}
342EXPORT_SYMBOL_GPL(svcauth_unix_purge);
343
344static inline struct ip_map *
345ip_map_cached_get(struct svc_xprt *xprt)
346{
347 struct ip_map *ipm = NULL;
348 struct sunrpc_net *sn;
349
350 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
351 spin_lock(&xprt->xpt_lock);
352 ipm = xprt->xpt_auth_cache;
353 if (ipm != NULL) {
354 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
355 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
356 /*
357 * The entry has been invalidated since it was
358 * remembered, e.g. by a second mount from the
359 * same IP address.
360 */
361 xprt->xpt_auth_cache = NULL;
362 spin_unlock(&xprt->xpt_lock);
363 cache_put(&ipm->h, sn->ip_map_cache);
364 return NULL;
365 }
366 cache_get(&ipm->h);
367 }
368 spin_unlock(&xprt->xpt_lock);
369 }
370 return ipm;
371}
372
373static inline void
374ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
375{
376 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
377 spin_lock(&xprt->xpt_lock);
378 if (xprt->xpt_auth_cache == NULL) {
379 /* newly cached, keep the reference */
380 xprt->xpt_auth_cache = ipm;
381 ipm = NULL;
382 }
383 spin_unlock(&xprt->xpt_lock);
384 }
385 if (ipm) {
386 struct sunrpc_net *sn;
387
388 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
389 cache_put(&ipm->h, sn->ip_map_cache);
390 }
391}
392
393void
394svcauth_unix_info_release(struct svc_xprt *xpt)
395{
396 struct ip_map *ipm;
397
398 ipm = xpt->xpt_auth_cache;
399 if (ipm != NULL) {
400 struct sunrpc_net *sn;
401
402 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
403 cache_put(&ipm->h, sn->ip_map_cache);
404 }
405}
406
407/****************************************************************************
408 * auth.unix.gid cache
409 * simple cache to map a UID to a list of GIDs
410 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
411 */
412#define GID_HASHBITS 8
413#define GID_HASHMAX (1<<GID_HASHBITS)
414
415struct unix_gid {
416 struct cache_head h;
417 kuid_t uid;
418 struct group_info *gi;
419 struct rcu_head rcu;
420};
421
422static int unix_gid_hash(kuid_t uid)
423{
424 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
425}
426
427static void unix_gid_put(struct kref *kref)
428{
429 struct cache_head *item = container_of(kref, struct cache_head, ref);
430 struct unix_gid *ug = container_of(item, struct unix_gid, h);
431 if (test_bit(CACHE_VALID, &item->flags) &&
432 !test_bit(CACHE_NEGATIVE, &item->flags))
433 put_group_info(ug->gi);
434 kfree_rcu(ug, rcu);
435}
436
437static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
438{
439 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
440 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
441 return uid_eq(orig->uid, new->uid);
442}
443static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
444{
445 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
446 struct unix_gid *item = container_of(citem, struct unix_gid, h);
447 new->uid = item->uid;
448}
449static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
450{
451 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
452 struct unix_gid *item = container_of(citem, struct unix_gid, h);
453
454 get_group_info(item->gi);
455 new->gi = item->gi;
456}
457static struct cache_head *unix_gid_alloc(void)
458{
459 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
460 if (g)
461 return &g->h;
462 else
463 return NULL;
464}
465
466static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
467{
468 return sunrpc_cache_pipe_upcall_timeout(cd, h);
469}
470
471static void unix_gid_request(struct cache_detail *cd,
472 struct cache_head *h,
473 char **bpp, int *blen)
474{
475 char tuid[20];
476 struct unix_gid *ug = container_of(h, struct unix_gid, h);
477
478 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
479 qword_add(bpp, blen, tuid);
480 (*bpp)[-1] = '\n';
481}
482
483static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
484
485static int unix_gid_parse(struct cache_detail *cd,
486 char *mesg, int mlen)
487{
488 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
489 int id;
490 kuid_t uid;
491 int gids;
492 int rv;
493 int i;
494 int err;
495 time64_t expiry;
496 struct unix_gid ug, *ugp;
497
498 if (mesg[mlen - 1] != '\n')
499 return -EINVAL;
500 mesg[mlen-1] = 0;
501
502 rv = get_int(&mesg, &id);
503 if (rv)
504 return -EINVAL;
505 uid = make_kuid(current_user_ns(), id);
506 ug.uid = uid;
507
508 expiry = get_expiry(&mesg);
509 if (expiry == 0)
510 return -EINVAL;
511
512 rv = get_int(&mesg, &gids);
513 if (rv || gids < 0 || gids > 8192)
514 return -EINVAL;
515
516 ug.gi = groups_alloc(gids);
517 if (!ug.gi)
518 return -ENOMEM;
519
520 for (i = 0 ; i < gids ; i++) {
521 int gid;
522 kgid_t kgid;
523 rv = get_int(&mesg, &gid);
524 err = -EINVAL;
525 if (rv)
526 goto out;
527 kgid = make_kgid(current_user_ns(), gid);
528 if (!gid_valid(kgid))
529 goto out;
530 ug.gi->gid[i] = kgid;
531 }
532
533 groups_sort(ug.gi);
534 ugp = unix_gid_lookup(cd, uid);
535 if (ugp) {
536 struct cache_head *ch;
537 ug.h.flags = 0;
538 ug.h.expiry_time = expiry;
539 ch = sunrpc_cache_update(cd,
540 &ug.h, &ugp->h,
541 unix_gid_hash(uid));
542 if (!ch)
543 err = -ENOMEM;
544 else {
545 err = 0;
546 cache_put(ch, cd);
547 }
548 } else
549 err = -ENOMEM;
550 out:
551 if (ug.gi)
552 put_group_info(ug.gi);
553 return err;
554}
555
556static int unix_gid_show(struct seq_file *m,
557 struct cache_detail *cd,
558 struct cache_head *h)
559{
560 struct user_namespace *user_ns = m->file->f_cred->user_ns;
561 struct unix_gid *ug;
562 int i;
563 int glen;
564
565 if (h == NULL) {
566 seq_puts(m, "#uid cnt: gids...\n");
567 return 0;
568 }
569 ug = container_of(h, struct unix_gid, h);
570 if (test_bit(CACHE_VALID, &h->flags) &&
571 !test_bit(CACHE_NEGATIVE, &h->flags))
572 glen = ug->gi->ngroups;
573 else
574 glen = 0;
575
576 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
577 for (i = 0; i < glen; i++)
578 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
579 seq_printf(m, "\n");
580 return 0;
581}
582
583static const struct cache_detail unix_gid_cache_template = {
584 .owner = THIS_MODULE,
585 .hash_size = GID_HASHMAX,
586 .name = "auth.unix.gid",
587 .cache_put = unix_gid_put,
588 .cache_upcall = unix_gid_upcall,
589 .cache_request = unix_gid_request,
590 .cache_parse = unix_gid_parse,
591 .cache_show = unix_gid_show,
592 .match = unix_gid_match,
593 .init = unix_gid_init,
594 .update = unix_gid_update,
595 .alloc = unix_gid_alloc,
596};
597
598int unix_gid_cache_create(struct net *net)
599{
600 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
601 struct cache_detail *cd;
602 int err;
603
604 cd = cache_create_net(&unix_gid_cache_template, net);
605 if (IS_ERR(cd))
606 return PTR_ERR(cd);
607 err = cache_register_net(cd, net);
608 if (err) {
609 cache_destroy_net(cd, net);
610 return err;
611 }
612 sn->unix_gid_cache = cd;
613 return 0;
614}
615
616void unix_gid_cache_destroy(struct net *net)
617{
618 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
619 struct cache_detail *cd = sn->unix_gid_cache;
620
621 sn->unix_gid_cache = NULL;
622 cache_purge(cd);
623 cache_unregister_net(cd, net);
624 cache_destroy_net(cd, net);
625}
626
627static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
628{
629 struct unix_gid ug;
630 struct cache_head *ch;
631
632 ug.uid = uid;
633 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
634 if (ch)
635 return container_of(ch, struct unix_gid, h);
636 else
637 return NULL;
638}
639
640static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
641{
642 struct unix_gid *ug;
643 struct group_info *gi;
644 int ret;
645 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
646 sunrpc_net_id);
647
648 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
649 if (!ug)
650 return ERR_PTR(-EAGAIN);
651 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
652 switch (ret) {
653 case -ENOENT:
654 return ERR_PTR(-ENOENT);
655 case -ETIMEDOUT:
656 return ERR_PTR(-ESHUTDOWN);
657 case 0:
658 gi = get_group_info(ug->gi);
659 cache_put(&ug->h, sn->unix_gid_cache);
660 return gi;
661 default:
662 return ERR_PTR(-EAGAIN);
663 }
664}
665
666int
667svcauth_unix_set_client(struct svc_rqst *rqstp)
668{
669 struct sockaddr_in *sin;
670 struct sockaddr_in6 *sin6, sin6_storage;
671 struct ip_map *ipm;
672 struct group_info *gi;
673 struct svc_cred *cred = &rqstp->rq_cred;
674 struct svc_xprt *xprt = rqstp->rq_xprt;
675 struct net *net = xprt->xpt_net;
676 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
677
678 switch (rqstp->rq_addr.ss_family) {
679 case AF_INET:
680 sin = svc_addr_in(rqstp);
681 sin6 = &sin6_storage;
682 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
683 break;
684 case AF_INET6:
685 sin6 = svc_addr_in6(rqstp);
686 break;
687 default:
688 BUG();
689 }
690
691 rqstp->rq_client = NULL;
692 if (rqstp->rq_proc == 0)
693 return SVC_OK;
694
695 ipm = ip_map_cached_get(xprt);
696 if (ipm == NULL)
697 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
698 &sin6->sin6_addr);
699
700 if (ipm == NULL)
701 return SVC_DENIED;
702
703 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
704 default:
705 BUG();
706 case -ETIMEDOUT:
707 return SVC_CLOSE;
708 case -EAGAIN:
709 return SVC_DROP;
710 case -ENOENT:
711 return SVC_DENIED;
712 case 0:
713 rqstp->rq_client = &ipm->m_client->h;
714 kref_get(&rqstp->rq_client->ref);
715 ip_map_cached_put(xprt, ipm);
716 break;
717 }
718
719 gi = unix_gid_find(cred->cr_uid, rqstp);
720 switch (PTR_ERR(gi)) {
721 case -EAGAIN:
722 return SVC_DROP;
723 case -ESHUTDOWN:
724 return SVC_CLOSE;
725 case -ENOENT:
726 break;
727 default:
728 put_group_info(cred->cr_group_info);
729 cred->cr_group_info = gi;
730 }
731 return SVC_OK;
732}
733
734EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
735
736static int
737svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
738{
739 struct kvec *argv = &rqstp->rq_arg.head[0];
740 struct kvec *resv = &rqstp->rq_res.head[0];
741 struct svc_cred *cred = &rqstp->rq_cred;
742
743 if (argv->iov_len < 3*4)
744 return SVC_GARBAGE;
745
746 if (svc_getu32(argv) != 0) {
747 dprintk("svc: bad null cred\n");
748 *authp = rpc_autherr_badcred;
749 return SVC_DENIED;
750 }
751 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
752 dprintk("svc: bad null verf\n");
753 *authp = rpc_autherr_badverf;
754 return SVC_DENIED;
755 }
756
757 /* Signal that mapping to nobody uid/gid is required */
758 cred->cr_uid = INVALID_UID;
759 cred->cr_gid = INVALID_GID;
760 cred->cr_group_info = groups_alloc(0);
761 if (cred->cr_group_info == NULL)
762 return SVC_CLOSE; /* kmalloc failure - client must retry */
763
764 /* Put NULL verifier */
765 svc_putnl(resv, RPC_AUTH_NULL);
766 svc_putnl(resv, 0);
767
768 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
769 return SVC_OK;
770}
771
772static int
773svcauth_null_release(struct svc_rqst *rqstp)
774{
775 if (rqstp->rq_client)
776 auth_domain_put(rqstp->rq_client);
777 rqstp->rq_client = NULL;
778 if (rqstp->rq_cred.cr_group_info)
779 put_group_info(rqstp->rq_cred.cr_group_info);
780 rqstp->rq_cred.cr_group_info = NULL;
781
782 return 0; /* don't drop */
783}
784
785
786struct auth_ops svcauth_null = {
787 .name = "null",
788 .owner = THIS_MODULE,
789 .flavour = RPC_AUTH_NULL,
790 .accept = svcauth_null_accept,
791 .release = svcauth_null_release,
792 .set_client = svcauth_unix_set_client,
793};
794
795
796static int
797svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
798{
799 struct kvec *argv = &rqstp->rq_arg.head[0];
800 struct kvec *resv = &rqstp->rq_res.head[0];
801 struct svc_cred *cred = &rqstp->rq_cred;
802 struct user_namespace *userns;
803 u32 slen, i;
804 int len = argv->iov_len;
805
806 if ((len -= 3*4) < 0)
807 return SVC_GARBAGE;
808
809 svc_getu32(argv); /* length */
810 svc_getu32(argv); /* time stamp */
811 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
812 if (slen > 64 || (len -= (slen + 3)*4) < 0)
813 goto badcred;
814 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
815 argv->iov_len -= slen*4;
816 /*
817 * Note: we skip uid_valid()/gid_valid() checks here for
818 * backwards compatibility with clients that use -1 id's.
819 * Instead, -1 uid or gid is later mapped to the
820 * (export-specific) anonymous id by nfsd_setuser.
821 * Supplementary gid's will be left alone.
822 */
823 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
824 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
825 cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
826 cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
827 slen = svc_getnl(argv); /* gids length */
828 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
829 goto badcred;
830 cred->cr_group_info = groups_alloc(slen);
831 if (cred->cr_group_info == NULL)
832 return SVC_CLOSE;
833 for (i = 0; i < slen; i++) {
834 kgid_t kgid = make_kgid(userns, svc_getnl(argv));
835 cred->cr_group_info->gid[i] = kgid;
836 }
837 groups_sort(cred->cr_group_info);
838 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
839 *authp = rpc_autherr_badverf;
840 return SVC_DENIED;
841 }
842
843 /* Put NULL verifier */
844 svc_putnl(resv, RPC_AUTH_NULL);
845 svc_putnl(resv, 0);
846
847 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
848 return SVC_OK;
849
850badcred:
851 *authp = rpc_autherr_badcred;
852 return SVC_DENIED;
853}
854
855static int
856svcauth_unix_release(struct svc_rqst *rqstp)
857{
858 /* Verifier (such as it is) is already in place.
859 */
860 if (rqstp->rq_client)
861 auth_domain_put(rqstp->rq_client);
862 rqstp->rq_client = NULL;
863 if (rqstp->rq_cred.cr_group_info)
864 put_group_info(rqstp->rq_cred.cr_group_info);
865 rqstp->rq_cred.cr_group_info = NULL;
866
867 return 0;
868}
869
870
871struct auth_ops svcauth_unix = {
872 .name = "unix",
873 .owner = THIS_MODULE,
874 .flavour = RPC_AUTH_UNIX,
875 .accept = svcauth_unix_accept,
876 .release = svcauth_unix_release,
877 .domain_release = svcauth_unix_domain_release,
878 .set_client = svcauth_unix_set_client,
879};
880
881static const struct cache_detail ip_map_cache_template = {
882 .owner = THIS_MODULE,
883 .hash_size = IP_HASHMAX,
884 .name = "auth.unix.ip",
885 .cache_put = ip_map_put,
886 .cache_upcall = ip_map_upcall,
887 .cache_request = ip_map_request,
888 .cache_parse = ip_map_parse,
889 .cache_show = ip_map_show,
890 .match = ip_map_match,
891 .init = ip_map_init,
892 .update = update,
893 .alloc = ip_map_alloc,
894};
895
896int ip_map_cache_create(struct net *net)
897{
898 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
899 struct cache_detail *cd;
900 int err;
901
902 cd = cache_create_net(&ip_map_cache_template, net);
903 if (IS_ERR(cd))
904 return PTR_ERR(cd);
905 err = cache_register_net(cd, net);
906 if (err) {
907 cache_destroy_net(cd, net);
908 return err;
909 }
910 sn->ip_map_cache = cd;
911 return 0;
912}
913
914void ip_map_cache_destroy(struct net *net)
915{
916 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
917 struct cache_detail *cd = sn->ip_map_cache;
918
919 sn->ip_map_cache = NULL;
920 cache_purge(cd);
921 cache_unregister_net(cd, net);
922 cache_destroy_net(cd, net);
923}
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;
40extern struct auth_ops svcauth_tls;
41
42static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
43{
44 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
45 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
46
47 kfree(dom->name);
48 kfree(ud);
49}
50
51static void svcauth_unix_domain_release(struct auth_domain *dom)
52{
53 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
54}
55
56struct auth_domain *unix_domain_find(char *name)
57{
58 struct auth_domain *rv;
59 struct unix_domain *new = NULL;
60
61 rv = auth_domain_find(name);
62 while(1) {
63 if (rv) {
64 if (new && rv != &new->h)
65 svcauth_unix_domain_release(&new->h);
66
67 if (rv->flavour != &svcauth_unix) {
68 auth_domain_put(rv);
69 return NULL;
70 }
71 return rv;
72 }
73
74 new = kmalloc(sizeof(*new), GFP_KERNEL);
75 if (new == NULL)
76 return NULL;
77 kref_init(&new->h.ref);
78 new->h.name = kstrdup(name, GFP_KERNEL);
79 if (new->h.name == NULL) {
80 kfree(new);
81 return NULL;
82 }
83 new->h.flavour = &svcauth_unix;
84 rv = auth_domain_lookup(name, &new->h);
85 }
86}
87EXPORT_SYMBOL_GPL(unix_domain_find);
88
89
90/**************************************************
91 * cache for IP address to unix_domain
92 * as needed by AUTH_UNIX
93 */
94#define IP_HASHBITS 8
95#define IP_HASHMAX (1<<IP_HASHBITS)
96
97struct ip_map {
98 struct cache_head h;
99 char m_class[8]; /* e.g. "nfsd" */
100 struct in6_addr m_addr;
101 struct unix_domain *m_client;
102 struct rcu_head m_rcu;
103};
104
105static void ip_map_put(struct kref *kref)
106{
107 struct cache_head *item = container_of(kref, struct cache_head, ref);
108 struct ip_map *im = container_of(item, struct ip_map,h);
109
110 if (test_bit(CACHE_VALID, &item->flags) &&
111 !test_bit(CACHE_NEGATIVE, &item->flags))
112 auth_domain_put(&im->m_client->h);
113 kfree_rcu(im, m_rcu);
114}
115
116static inline int hash_ip6(const struct in6_addr *ip)
117{
118 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
119}
120static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
121{
122 struct ip_map *orig = container_of(corig, struct ip_map, h);
123 struct ip_map *new = container_of(cnew, struct ip_map, h);
124 return strcmp(orig->m_class, new->m_class) == 0 &&
125 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
126}
127static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
128{
129 struct ip_map *new = container_of(cnew, struct ip_map, h);
130 struct ip_map *item = container_of(citem, struct ip_map, h);
131
132 strcpy(new->m_class, item->m_class);
133 new->m_addr = item->m_addr;
134}
135static void update(struct cache_head *cnew, struct cache_head *citem)
136{
137 struct ip_map *new = container_of(cnew, struct ip_map, h);
138 struct ip_map *item = container_of(citem, struct ip_map, h);
139
140 kref_get(&item->m_client->h.ref);
141 new->m_client = item->m_client;
142}
143static struct cache_head *ip_map_alloc(void)
144{
145 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
146 if (i)
147 return &i->h;
148 else
149 return NULL;
150}
151
152static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
153{
154 return sunrpc_cache_pipe_upcall(cd, h);
155}
156
157static void ip_map_request(struct cache_detail *cd,
158 struct cache_head *h,
159 char **bpp, int *blen)
160{
161 char text_addr[40];
162 struct ip_map *im = container_of(h, struct ip_map, h);
163
164 if (ipv6_addr_v4mapped(&(im->m_addr))) {
165 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
166 } else {
167 snprintf(text_addr, 40, "%pI6", &im->m_addr);
168 }
169 qword_add(bpp, blen, im->m_class);
170 qword_add(bpp, blen, text_addr);
171 (*bpp)[-1] = '\n';
172}
173
174static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
175static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
176
177static int ip_map_parse(struct cache_detail *cd,
178 char *mesg, int mlen)
179{
180 /* class ipaddress [domainname] */
181 /* should be safe just to use the start of the input buffer
182 * for scratch: */
183 char *buf = mesg;
184 int len;
185 char class[8];
186 union {
187 struct sockaddr sa;
188 struct sockaddr_in s4;
189 struct sockaddr_in6 s6;
190 } address;
191 struct sockaddr_in6 sin6;
192 int err;
193
194 struct ip_map *ipmp;
195 struct auth_domain *dom;
196 time64_t expiry;
197
198 if (mesg[mlen-1] != '\n')
199 return -EINVAL;
200 mesg[mlen-1] = 0;
201
202 /* class */
203 len = qword_get(&mesg, class, sizeof(class));
204 if (len <= 0) return -EINVAL;
205
206 /* ip address */
207 len = qword_get(&mesg, buf, mlen);
208 if (len <= 0) return -EINVAL;
209
210 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
211 return -EINVAL;
212 switch (address.sa.sa_family) {
213 case AF_INET:
214 /* Form a mapped IPv4 address in sin6 */
215 sin6.sin6_family = AF_INET6;
216 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
217 &sin6.sin6_addr);
218 break;
219#if IS_ENABLED(CONFIG_IPV6)
220 case AF_INET6:
221 memcpy(&sin6, &address.s6, sizeof(sin6));
222 break;
223#endif
224 default:
225 return -EINVAL;
226 }
227
228 expiry = get_expiry(&mesg);
229 if (expiry ==0)
230 return -EINVAL;
231
232 /* domainname, or empty for NEGATIVE */
233 len = qword_get(&mesg, buf, mlen);
234 if (len < 0) return -EINVAL;
235
236 if (len) {
237 dom = unix_domain_find(buf);
238 if (dom == NULL)
239 return -ENOENT;
240 } else
241 dom = NULL;
242
243 /* IPv6 scope IDs are ignored for now */
244 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
245 if (ipmp) {
246 err = __ip_map_update(cd, ipmp,
247 container_of(dom, struct unix_domain, h),
248 expiry);
249 } else
250 err = -ENOMEM;
251
252 if (dom)
253 auth_domain_put(dom);
254
255 cache_flush();
256 return err;
257}
258
259static int ip_map_show(struct seq_file *m,
260 struct cache_detail *cd,
261 struct cache_head *h)
262{
263 struct ip_map *im;
264 struct in6_addr addr;
265 char *dom = "-no-domain-";
266
267 if (h == NULL) {
268 seq_puts(m, "#class IP domain\n");
269 return 0;
270 }
271 im = container_of(h, struct ip_map, h);
272 /* class addr domain */
273 addr = im->m_addr;
274
275 if (test_bit(CACHE_VALID, &h->flags) &&
276 !test_bit(CACHE_NEGATIVE, &h->flags))
277 dom = im->m_client->h.name;
278
279 if (ipv6_addr_v4mapped(&addr)) {
280 seq_printf(m, "%s %pI4 %s\n",
281 im->m_class, &addr.s6_addr32[3], dom);
282 } else {
283 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
284 }
285 return 0;
286}
287
288
289static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
290 struct in6_addr *addr)
291{
292 struct ip_map ip;
293 struct cache_head *ch;
294
295 strcpy(ip.m_class, class);
296 ip.m_addr = *addr;
297 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
298 hash_str(class, IP_HASHBITS) ^
299 hash_ip6(addr));
300
301 if (ch)
302 return container_of(ch, struct ip_map, h);
303 else
304 return NULL;
305}
306
307static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
308 struct unix_domain *udom, time64_t expiry)
309{
310 struct ip_map ip;
311 struct cache_head *ch;
312
313 ip.m_client = udom;
314 ip.h.flags = 0;
315 if (!udom)
316 set_bit(CACHE_NEGATIVE, &ip.h.flags);
317 ip.h.expiry_time = expiry;
318 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
319 hash_str(ipm->m_class, IP_HASHBITS) ^
320 hash_ip6(&ipm->m_addr));
321 if (!ch)
322 return -ENOMEM;
323 cache_put(ch, cd);
324 return 0;
325}
326
327void svcauth_unix_purge(struct net *net)
328{
329 struct sunrpc_net *sn;
330
331 sn = net_generic(net, sunrpc_net_id);
332 cache_purge(sn->ip_map_cache);
333}
334EXPORT_SYMBOL_GPL(svcauth_unix_purge);
335
336static inline struct ip_map *
337ip_map_cached_get(struct svc_xprt *xprt)
338{
339 struct ip_map *ipm = NULL;
340 struct sunrpc_net *sn;
341
342 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
343 spin_lock(&xprt->xpt_lock);
344 ipm = xprt->xpt_auth_cache;
345 if (ipm != NULL) {
346 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
347 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
348 /*
349 * The entry has been invalidated since it was
350 * remembered, e.g. by a second mount from the
351 * same IP address.
352 */
353 xprt->xpt_auth_cache = NULL;
354 spin_unlock(&xprt->xpt_lock);
355 cache_put(&ipm->h, sn->ip_map_cache);
356 return NULL;
357 }
358 cache_get(&ipm->h);
359 }
360 spin_unlock(&xprt->xpt_lock);
361 }
362 return ipm;
363}
364
365static inline void
366ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
367{
368 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
369 spin_lock(&xprt->xpt_lock);
370 if (xprt->xpt_auth_cache == NULL) {
371 /* newly cached, keep the reference */
372 xprt->xpt_auth_cache = ipm;
373 ipm = NULL;
374 }
375 spin_unlock(&xprt->xpt_lock);
376 }
377 if (ipm) {
378 struct sunrpc_net *sn;
379
380 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
381 cache_put(&ipm->h, sn->ip_map_cache);
382 }
383}
384
385void
386svcauth_unix_info_release(struct svc_xprt *xpt)
387{
388 struct ip_map *ipm;
389
390 ipm = xpt->xpt_auth_cache;
391 if (ipm != NULL) {
392 struct sunrpc_net *sn;
393
394 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
395 cache_put(&ipm->h, sn->ip_map_cache);
396 }
397}
398
399/****************************************************************************
400 * auth.unix.gid cache
401 * simple cache to map a UID to a list of GIDs
402 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
403 */
404#define GID_HASHBITS 8
405#define GID_HASHMAX (1<<GID_HASHBITS)
406
407struct unix_gid {
408 struct cache_head h;
409 kuid_t uid;
410 struct group_info *gi;
411 struct rcu_head rcu;
412};
413
414static int unix_gid_hash(kuid_t uid)
415{
416 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
417}
418
419static void unix_gid_put(struct kref *kref)
420{
421 struct cache_head *item = container_of(kref, struct cache_head, ref);
422 struct unix_gid *ug = container_of(item, struct unix_gid, h);
423 if (test_bit(CACHE_VALID, &item->flags) &&
424 !test_bit(CACHE_NEGATIVE, &item->flags))
425 put_group_info(ug->gi);
426 kfree_rcu(ug, rcu);
427}
428
429static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
430{
431 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
432 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
433 return uid_eq(orig->uid, new->uid);
434}
435static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
436{
437 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
438 struct unix_gid *item = container_of(citem, struct unix_gid, h);
439 new->uid = item->uid;
440}
441static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
442{
443 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
444 struct unix_gid *item = container_of(citem, struct unix_gid, h);
445
446 get_group_info(item->gi);
447 new->gi = item->gi;
448}
449static struct cache_head *unix_gid_alloc(void)
450{
451 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
452 if (g)
453 return &g->h;
454 else
455 return NULL;
456}
457
458static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
459{
460 return sunrpc_cache_pipe_upcall_timeout(cd, h);
461}
462
463static void unix_gid_request(struct cache_detail *cd,
464 struct cache_head *h,
465 char **bpp, int *blen)
466{
467 char tuid[20];
468 struct unix_gid *ug = container_of(h, struct unix_gid, h);
469
470 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
471 qword_add(bpp, blen, tuid);
472 (*bpp)[-1] = '\n';
473}
474
475static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
476
477static int unix_gid_parse(struct cache_detail *cd,
478 char *mesg, int mlen)
479{
480 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
481 int id;
482 kuid_t uid;
483 int gids;
484 int rv;
485 int i;
486 int err;
487 time64_t expiry;
488 struct unix_gid ug, *ugp;
489
490 if (mesg[mlen - 1] != '\n')
491 return -EINVAL;
492 mesg[mlen-1] = 0;
493
494 rv = get_int(&mesg, &id);
495 if (rv)
496 return -EINVAL;
497 uid = make_kuid(current_user_ns(), id);
498 ug.uid = uid;
499
500 expiry = get_expiry(&mesg);
501 if (expiry == 0)
502 return -EINVAL;
503
504 rv = get_int(&mesg, &gids);
505 if (rv || gids < 0 || gids > 8192)
506 return -EINVAL;
507
508 ug.gi = groups_alloc(gids);
509 if (!ug.gi)
510 return -ENOMEM;
511
512 for (i = 0 ; i < gids ; i++) {
513 int gid;
514 kgid_t kgid;
515 rv = get_int(&mesg, &gid);
516 err = -EINVAL;
517 if (rv)
518 goto out;
519 kgid = make_kgid(current_user_ns(), gid);
520 if (!gid_valid(kgid))
521 goto out;
522 ug.gi->gid[i] = kgid;
523 }
524
525 groups_sort(ug.gi);
526 ugp = unix_gid_lookup(cd, uid);
527 if (ugp) {
528 struct cache_head *ch;
529 ug.h.flags = 0;
530 ug.h.expiry_time = expiry;
531 ch = sunrpc_cache_update(cd,
532 &ug.h, &ugp->h,
533 unix_gid_hash(uid));
534 if (!ch)
535 err = -ENOMEM;
536 else {
537 err = 0;
538 cache_put(ch, cd);
539 }
540 } else
541 err = -ENOMEM;
542 out:
543 if (ug.gi)
544 put_group_info(ug.gi);
545 return err;
546}
547
548static int unix_gid_show(struct seq_file *m,
549 struct cache_detail *cd,
550 struct cache_head *h)
551{
552 struct user_namespace *user_ns = m->file->f_cred->user_ns;
553 struct unix_gid *ug;
554 int i;
555 int glen;
556
557 if (h == NULL) {
558 seq_puts(m, "#uid cnt: gids...\n");
559 return 0;
560 }
561 ug = container_of(h, struct unix_gid, h);
562 if (test_bit(CACHE_VALID, &h->flags) &&
563 !test_bit(CACHE_NEGATIVE, &h->flags))
564 glen = ug->gi->ngroups;
565 else
566 glen = 0;
567
568 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
569 for (i = 0; i < glen; i++)
570 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
571 seq_printf(m, "\n");
572 return 0;
573}
574
575static const struct cache_detail unix_gid_cache_template = {
576 .owner = THIS_MODULE,
577 .hash_size = GID_HASHMAX,
578 .name = "auth.unix.gid",
579 .cache_put = unix_gid_put,
580 .cache_upcall = unix_gid_upcall,
581 .cache_request = unix_gid_request,
582 .cache_parse = unix_gid_parse,
583 .cache_show = unix_gid_show,
584 .match = unix_gid_match,
585 .init = unix_gid_init,
586 .update = unix_gid_update,
587 .alloc = unix_gid_alloc,
588};
589
590int unix_gid_cache_create(struct net *net)
591{
592 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
593 struct cache_detail *cd;
594 int err;
595
596 cd = cache_create_net(&unix_gid_cache_template, net);
597 if (IS_ERR(cd))
598 return PTR_ERR(cd);
599 err = cache_register_net(cd, net);
600 if (err) {
601 cache_destroy_net(cd, net);
602 return err;
603 }
604 sn->unix_gid_cache = cd;
605 return 0;
606}
607
608void unix_gid_cache_destroy(struct net *net)
609{
610 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
611 struct cache_detail *cd = sn->unix_gid_cache;
612
613 sn->unix_gid_cache = NULL;
614 cache_purge(cd);
615 cache_unregister_net(cd, net);
616 cache_destroy_net(cd, net);
617}
618
619static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
620{
621 struct unix_gid ug;
622 struct cache_head *ch;
623
624 ug.uid = uid;
625 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
626 if (ch)
627 return container_of(ch, struct unix_gid, h);
628 else
629 return NULL;
630}
631
632static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
633{
634 struct unix_gid *ug;
635 struct group_info *gi;
636 int ret;
637 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
638 sunrpc_net_id);
639
640 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
641 if (!ug)
642 return ERR_PTR(-EAGAIN);
643 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
644 switch (ret) {
645 case -ENOENT:
646 return ERR_PTR(-ENOENT);
647 case -ETIMEDOUT:
648 return ERR_PTR(-ESHUTDOWN);
649 case 0:
650 gi = get_group_info(ug->gi);
651 cache_put(&ug->h, sn->unix_gid_cache);
652 return gi;
653 default:
654 return ERR_PTR(-EAGAIN);
655 }
656}
657
658int
659svcauth_unix_set_client(struct svc_rqst *rqstp)
660{
661 struct sockaddr_in *sin;
662 struct sockaddr_in6 *sin6, sin6_storage;
663 struct ip_map *ipm;
664 struct group_info *gi;
665 struct svc_cred *cred = &rqstp->rq_cred;
666 struct svc_xprt *xprt = rqstp->rq_xprt;
667 struct net *net = xprt->xpt_net;
668 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
669
670 switch (rqstp->rq_addr.ss_family) {
671 case AF_INET:
672 sin = svc_addr_in(rqstp);
673 sin6 = &sin6_storage;
674 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
675 break;
676 case AF_INET6:
677 sin6 = svc_addr_in6(rqstp);
678 break;
679 default:
680 BUG();
681 }
682
683 rqstp->rq_client = NULL;
684 if (rqstp->rq_proc == 0)
685 goto out;
686
687 rqstp->rq_auth_stat = rpc_autherr_badcred;
688 ipm = ip_map_cached_get(xprt);
689 if (ipm == NULL)
690 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
691 &sin6->sin6_addr);
692
693 if (ipm == NULL)
694 return SVC_DENIED;
695
696 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
697 default:
698 BUG();
699 case -ETIMEDOUT:
700 return SVC_CLOSE;
701 case -EAGAIN:
702 return SVC_DROP;
703 case -ENOENT:
704 return SVC_DENIED;
705 case 0:
706 rqstp->rq_client = &ipm->m_client->h;
707 kref_get(&rqstp->rq_client->ref);
708 ip_map_cached_put(xprt, ipm);
709 break;
710 }
711
712 gi = unix_gid_find(cred->cr_uid, rqstp);
713 switch (PTR_ERR(gi)) {
714 case -EAGAIN:
715 return SVC_DROP;
716 case -ESHUTDOWN:
717 return SVC_CLOSE;
718 case -ENOENT:
719 break;
720 default:
721 put_group_info(cred->cr_group_info);
722 cred->cr_group_info = gi;
723 }
724
725out:
726 rqstp->rq_auth_stat = rpc_auth_ok;
727 return SVC_OK;
728}
729
730EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
731
732static int
733svcauth_null_accept(struct svc_rqst *rqstp)
734{
735 struct kvec *argv = &rqstp->rq_arg.head[0];
736 struct kvec *resv = &rqstp->rq_res.head[0];
737 struct svc_cred *cred = &rqstp->rq_cred;
738
739 if (argv->iov_len < 3*4)
740 return SVC_GARBAGE;
741
742 if (svc_getu32(argv) != 0) {
743 dprintk("svc: bad null cred\n");
744 rqstp->rq_auth_stat = rpc_autherr_badcred;
745 return SVC_DENIED;
746 }
747 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
748 dprintk("svc: bad null verf\n");
749 rqstp->rq_auth_stat = rpc_autherr_badverf;
750 return SVC_DENIED;
751 }
752
753 /* Signal that mapping to nobody uid/gid is required */
754 cred->cr_uid = INVALID_UID;
755 cred->cr_gid = INVALID_GID;
756 cred->cr_group_info = groups_alloc(0);
757 if (cred->cr_group_info == NULL)
758 return SVC_CLOSE; /* kmalloc failure - client must retry */
759
760 /* Put NULL verifier */
761 svc_putnl(resv, RPC_AUTH_NULL);
762 svc_putnl(resv, 0);
763
764 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
765 return SVC_OK;
766}
767
768static int
769svcauth_null_release(struct svc_rqst *rqstp)
770{
771 if (rqstp->rq_client)
772 auth_domain_put(rqstp->rq_client);
773 rqstp->rq_client = NULL;
774 if (rqstp->rq_cred.cr_group_info)
775 put_group_info(rqstp->rq_cred.cr_group_info);
776 rqstp->rq_cred.cr_group_info = NULL;
777
778 return 0; /* don't drop */
779}
780
781
782struct auth_ops svcauth_null = {
783 .name = "null",
784 .owner = THIS_MODULE,
785 .flavour = RPC_AUTH_NULL,
786 .accept = svcauth_null_accept,
787 .release = svcauth_null_release,
788 .set_client = svcauth_unix_set_client,
789};
790
791
792static int
793svcauth_tls_accept(struct svc_rqst *rqstp)
794{
795 struct svc_cred *cred = &rqstp->rq_cred;
796 struct kvec *argv = rqstp->rq_arg.head;
797 struct kvec *resv = rqstp->rq_res.head;
798
799 if (argv->iov_len < XDR_UNIT * 3)
800 return SVC_GARBAGE;
801
802 /* Call's cred length */
803 if (svc_getu32(argv) != xdr_zero) {
804 rqstp->rq_auth_stat = rpc_autherr_badcred;
805 return SVC_DENIED;
806 }
807
808 /* Call's verifier flavor and its length */
809 if (svc_getu32(argv) != rpc_auth_null ||
810 svc_getu32(argv) != xdr_zero) {
811 rqstp->rq_auth_stat = rpc_autherr_badverf;
812 return SVC_DENIED;
813 }
814
815 /* AUTH_TLS is not valid on non-NULL procedures */
816 if (rqstp->rq_proc != 0) {
817 rqstp->rq_auth_stat = rpc_autherr_badcred;
818 return SVC_DENIED;
819 }
820
821 /* Mapping to nobody uid/gid is required */
822 cred->cr_uid = INVALID_UID;
823 cred->cr_gid = INVALID_GID;
824 cred->cr_group_info = groups_alloc(0);
825 if (cred->cr_group_info == NULL)
826 return SVC_CLOSE; /* kmalloc failure - client must retry */
827
828 /* Reply's verifier */
829 svc_putnl(resv, RPC_AUTH_NULL);
830 if (rqstp->rq_xprt->xpt_ops->xpo_start_tls) {
831 svc_putnl(resv, 8);
832 memcpy(resv->iov_base + resv->iov_len, "STARTTLS", 8);
833 resv->iov_len += 8;
834 } else
835 svc_putnl(resv, 0);
836
837 rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
838 return SVC_OK;
839}
840
841struct auth_ops svcauth_tls = {
842 .name = "tls",
843 .owner = THIS_MODULE,
844 .flavour = RPC_AUTH_TLS,
845 .accept = svcauth_tls_accept,
846 .release = svcauth_null_release,
847 .set_client = svcauth_unix_set_client,
848};
849
850
851static int
852svcauth_unix_accept(struct svc_rqst *rqstp)
853{
854 struct kvec *argv = &rqstp->rq_arg.head[0];
855 struct kvec *resv = &rqstp->rq_res.head[0];
856 struct svc_cred *cred = &rqstp->rq_cred;
857 struct user_namespace *userns;
858 u32 slen, i;
859 int len = argv->iov_len;
860
861 if ((len -= 3*4) < 0)
862 return SVC_GARBAGE;
863
864 svc_getu32(argv); /* length */
865 svc_getu32(argv); /* time stamp */
866 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
867 if (slen > 64 || (len -= (slen + 3)*4) < 0)
868 goto badcred;
869 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
870 argv->iov_len -= slen*4;
871 /*
872 * Note: we skip uid_valid()/gid_valid() checks here for
873 * backwards compatibility with clients that use -1 id's.
874 * Instead, -1 uid or gid is later mapped to the
875 * (export-specific) anonymous id by nfsd_setuser.
876 * Supplementary gid's will be left alone.
877 */
878 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
879 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
880 cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
881 cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
882 slen = svc_getnl(argv); /* gids length */
883 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
884 goto badcred;
885 cred->cr_group_info = groups_alloc(slen);
886 if (cred->cr_group_info == NULL)
887 return SVC_CLOSE;
888 for (i = 0; i < slen; i++) {
889 kgid_t kgid = make_kgid(userns, svc_getnl(argv));
890 cred->cr_group_info->gid[i] = kgid;
891 }
892 groups_sort(cred->cr_group_info);
893 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
894 rqstp->rq_auth_stat = rpc_autherr_badverf;
895 return SVC_DENIED;
896 }
897
898 /* Put NULL verifier */
899 svc_putnl(resv, RPC_AUTH_NULL);
900 svc_putnl(resv, 0);
901
902 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
903 return SVC_OK;
904
905badcred:
906 rqstp->rq_auth_stat = rpc_autherr_badcred;
907 return SVC_DENIED;
908}
909
910static int
911svcauth_unix_release(struct svc_rqst *rqstp)
912{
913 /* Verifier (such as it is) is already in place.
914 */
915 if (rqstp->rq_client)
916 auth_domain_put(rqstp->rq_client);
917 rqstp->rq_client = NULL;
918 if (rqstp->rq_cred.cr_group_info)
919 put_group_info(rqstp->rq_cred.cr_group_info);
920 rqstp->rq_cred.cr_group_info = NULL;
921
922 return 0;
923}
924
925
926struct auth_ops svcauth_unix = {
927 .name = "unix",
928 .owner = THIS_MODULE,
929 .flavour = RPC_AUTH_UNIX,
930 .accept = svcauth_unix_accept,
931 .release = svcauth_unix_release,
932 .domain_release = svcauth_unix_domain_release,
933 .set_client = svcauth_unix_set_client,
934};
935
936static const struct cache_detail ip_map_cache_template = {
937 .owner = THIS_MODULE,
938 .hash_size = IP_HASHMAX,
939 .name = "auth.unix.ip",
940 .cache_put = ip_map_put,
941 .cache_upcall = ip_map_upcall,
942 .cache_request = ip_map_request,
943 .cache_parse = ip_map_parse,
944 .cache_show = ip_map_show,
945 .match = ip_map_match,
946 .init = ip_map_init,
947 .update = update,
948 .alloc = ip_map_alloc,
949};
950
951int ip_map_cache_create(struct net *net)
952{
953 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
954 struct cache_detail *cd;
955 int err;
956
957 cd = cache_create_net(&ip_map_cache_template, net);
958 if (IS_ERR(cd))
959 return PTR_ERR(cd);
960 err = cache_register_net(cd, net);
961 if (err) {
962 cache_destroy_net(cd, net);
963 return err;
964 }
965 sn->ip_map_cache = cd;
966 return 0;
967}
968
969void ip_map_cache_destroy(struct net *net)
970{
971 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
972 struct cache_detail *cd = sn->ip_map_cache;
973
974 sn->ip_map_cache = NULL;
975 cache_purge(cd);
976 cache_unregister_net(cd, net);
977 cache_destroy_net(cd, net);
978}