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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#include <linux/types.h>
2#include <linux/sched.h>
3#include <linux/module.h>
4#include <linux/sunrpc/types.h>
5#include <linux/sunrpc/xdr.h>
6#include <linux/sunrpc/svcsock.h>
7#include <linux/sunrpc/svcauth.h>
8#include <linux/sunrpc/gss_api.h>
9#include <linux/err.h>
10#include <linux/seq_file.h>
11#include <linux/hash.h>
12#include <linux/string.h>
13#include <linux/slab.h>
14#include <net/sock.h>
15#include <net/ipv6.h>
16#include <linux/kernel.h>
17#include <linux/user_namespace.h>
18#define RPCDBG_FACILITY RPCDBG_AUTH
19
20#include <linux/sunrpc/clnt.h>
21
22#include "netns.h"
23
24/*
25 * AUTHUNIX and AUTHNULL credentials are both handled here.
26 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
27 * are always nobody (-2). i.e. we do the same IP address checks for
28 * AUTHNULL as for AUTHUNIX, and that is done here.
29 */
30
31
32struct unix_domain {
33 struct auth_domain h;
34 /* other stuff later */
35};
36
37extern struct auth_ops svcauth_null;
38extern struct auth_ops svcauth_unix;
39
40static void svcauth_unix_domain_release(struct auth_domain *dom)
41{
42 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
43
44 kfree(dom->name);
45 kfree(ud);
46}
47
48struct auth_domain *unix_domain_find(char *name)
49{
50 struct auth_domain *rv;
51 struct unix_domain *new = NULL;
52
53 rv = auth_domain_lookup(name, NULL);
54 while(1) {
55 if (rv) {
56 if (new && rv != &new->h)
57 svcauth_unix_domain_release(&new->h);
58
59 if (rv->flavour != &svcauth_unix) {
60 auth_domain_put(rv);
61 return NULL;
62 }
63 return rv;
64 }
65
66 new = kmalloc(sizeof(*new), GFP_KERNEL);
67 if (new == NULL)
68 return NULL;
69 kref_init(&new->h.ref);
70 new->h.name = kstrdup(name, GFP_KERNEL);
71 if (new->h.name == NULL) {
72 kfree(new);
73 return NULL;
74 }
75 new->h.flavour = &svcauth_unix;
76 rv = auth_domain_lookup(name, &new->h);
77 }
78}
79EXPORT_SYMBOL_GPL(unix_domain_find);
80
81
82/**************************************************
83 * cache for IP address to unix_domain
84 * as needed by AUTH_UNIX
85 */
86#define IP_HASHBITS 8
87#define IP_HASHMAX (1<<IP_HASHBITS)
88
89struct ip_map {
90 struct cache_head h;
91 char m_class[8]; /* e.g. "nfsd" */
92 struct in6_addr m_addr;
93 struct unix_domain *m_client;
94};
95
96static void ip_map_put(struct kref *kref)
97{
98 struct cache_head *item = container_of(kref, struct cache_head, ref);
99 struct ip_map *im = container_of(item, struct ip_map,h);
100
101 if (test_bit(CACHE_VALID, &item->flags) &&
102 !test_bit(CACHE_NEGATIVE, &item->flags))
103 auth_domain_put(&im->m_client->h);
104 kfree(im);
105}
106
107#if IP_HASHBITS == 8
108/* hash_long on a 64 bit machine is currently REALLY BAD for
109 * IP addresses in reverse-endian (i.e. on a little-endian machine).
110 * So use a trivial but reliable hash instead
111 */
112static inline int hash_ip(__be32 ip)
113{
114 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
115 return (hash ^ (hash>>8)) & 0xff;
116}
117#endif
118static inline int hash_ip6(struct in6_addr ip)
119{
120 return (hash_ip(ip.s6_addr32[0]) ^
121 hash_ip(ip.s6_addr32[1]) ^
122 hash_ip(ip.s6_addr32[2]) ^
123 hash_ip(ip.s6_addr32[3]));
124}
125static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
126{
127 struct ip_map *orig = container_of(corig, struct ip_map, h);
128 struct ip_map *new = container_of(cnew, struct ip_map, h);
129 return strcmp(orig->m_class, new->m_class) == 0 &&
130 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
131}
132static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
133{
134 struct ip_map *new = container_of(cnew, struct ip_map, h);
135 struct ip_map *item = container_of(citem, struct ip_map, h);
136
137 strcpy(new->m_class, item->m_class);
138 new->m_addr = item->m_addr;
139}
140static void update(struct cache_head *cnew, struct cache_head *citem)
141{
142 struct ip_map *new = container_of(cnew, struct ip_map, h);
143 struct ip_map *item = container_of(citem, struct ip_map, h);
144
145 kref_get(&item->m_client->h.ref);
146 new->m_client = item->m_client;
147}
148static struct cache_head *ip_map_alloc(void)
149{
150 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
151 if (i)
152 return &i->h;
153 else
154 return NULL;
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 int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
175{
176 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
177}
178
179static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
180static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
181
182static int ip_map_parse(struct cache_detail *cd,
183 char *mesg, int mlen)
184{
185 /* class ipaddress [domainname] */
186 /* should be safe just to use the start of the input buffer
187 * for scratch: */
188 char *buf = mesg;
189 int len;
190 char class[8];
191 union {
192 struct sockaddr sa;
193 struct sockaddr_in s4;
194 struct sockaddr_in6 s6;
195 } address;
196 struct sockaddr_in6 sin6;
197 int err;
198
199 struct ip_map *ipmp;
200 struct auth_domain *dom;
201 time_t expiry;
202
203 if (mesg[mlen-1] != '\n')
204 return -EINVAL;
205 mesg[mlen-1] = 0;
206
207 /* class */
208 len = qword_get(&mesg, class, sizeof(class));
209 if (len <= 0) return -EINVAL;
210
211 /* ip address */
212 len = qword_get(&mesg, buf, mlen);
213 if (len <= 0) return -EINVAL;
214
215 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
216 return -EINVAL;
217 switch (address.sa.sa_family) {
218 case AF_INET:
219 /* Form a mapped IPv4 address in sin6 */
220 sin6.sin6_family = AF_INET6;
221 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
222 &sin6.sin6_addr);
223 break;
224#if IS_ENABLED(CONFIG_IPV6)
225 case AF_INET6:
226 memcpy(&sin6, &address.s6, sizeof(sin6));
227 break;
228#endif
229 default:
230 return -EINVAL;
231 }
232
233 expiry = get_expiry(&mesg);
234 if (expiry ==0)
235 return -EINVAL;
236
237 /* domainname, or empty for NEGATIVE */
238 len = qword_get(&mesg, buf, mlen);
239 if (len < 0) return -EINVAL;
240
241 if (len) {
242 dom = unix_domain_find(buf);
243 if (dom == NULL)
244 return -ENOENT;
245 } else
246 dom = NULL;
247
248 /* IPv6 scope IDs are ignored for now */
249 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
250 if (ipmp) {
251 err = __ip_map_update(cd, ipmp,
252 container_of(dom, struct unix_domain, h),
253 expiry);
254 } else
255 err = -ENOMEM;
256
257 if (dom)
258 auth_domain_put(dom);
259
260 cache_flush();
261 return err;
262}
263
264static int ip_map_show(struct seq_file *m,
265 struct cache_detail *cd,
266 struct cache_head *h)
267{
268 struct ip_map *im;
269 struct in6_addr addr;
270 char *dom = "-no-domain-";
271
272 if (h == NULL) {
273 seq_puts(m, "#class IP domain\n");
274 return 0;
275 }
276 im = container_of(h, struct ip_map, h);
277 /* class addr domain */
278 addr = im->m_addr;
279
280 if (test_bit(CACHE_VALID, &h->flags) &&
281 !test_bit(CACHE_NEGATIVE, &h->flags))
282 dom = im->m_client->h.name;
283
284 if (ipv6_addr_v4mapped(&addr)) {
285 seq_printf(m, "%s %pI4 %s\n",
286 im->m_class, &addr.s6_addr32[3], dom);
287 } else {
288 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
289 }
290 return 0;
291}
292
293
294static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
295 struct in6_addr *addr)
296{
297 struct ip_map ip;
298 struct cache_head *ch;
299
300 strcpy(ip.m_class, class);
301 ip.m_addr = *addr;
302 ch = sunrpc_cache_lookup(cd, &ip.h,
303 hash_str(class, IP_HASHBITS) ^
304 hash_ip6(*addr));
305
306 if (ch)
307 return container_of(ch, struct ip_map, h);
308 else
309 return NULL;
310}
311
312static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
313 struct in6_addr *addr)
314{
315 struct sunrpc_net *sn;
316
317 sn = net_generic(net, sunrpc_net_id);
318 return __ip_map_lookup(sn->ip_map_cache, class, addr);
319}
320
321static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
322 struct unix_domain *udom, time_t expiry)
323{
324 struct ip_map ip;
325 struct cache_head *ch;
326
327 ip.m_client = udom;
328 ip.h.flags = 0;
329 if (!udom)
330 set_bit(CACHE_NEGATIVE, &ip.h.flags);
331 ip.h.expiry_time = expiry;
332 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
333 hash_str(ipm->m_class, IP_HASHBITS) ^
334 hash_ip6(ipm->m_addr));
335 if (!ch)
336 return -ENOMEM;
337 cache_put(ch, cd);
338 return 0;
339}
340
341static inline int ip_map_update(struct net *net, struct ip_map *ipm,
342 struct unix_domain *udom, time_t expiry)
343{
344 struct sunrpc_net *sn;
345
346 sn = net_generic(net, sunrpc_net_id);
347 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
348}
349
350void svcauth_unix_purge(struct net *net)
351{
352 struct sunrpc_net *sn;
353
354 sn = net_generic(net, sunrpc_net_id);
355 cache_purge(sn->ip_map_cache);
356}
357EXPORT_SYMBOL_GPL(svcauth_unix_purge);
358
359static inline struct ip_map *
360ip_map_cached_get(struct svc_xprt *xprt)
361{
362 struct ip_map *ipm = NULL;
363 struct sunrpc_net *sn;
364
365 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
366 spin_lock(&xprt->xpt_lock);
367 ipm = xprt->xpt_auth_cache;
368 if (ipm != NULL) {
369 if (!cache_valid(&ipm->h)) {
370 /*
371 * The entry has been invalidated since it was
372 * remembered, e.g. by a second mount from the
373 * same IP address.
374 */
375 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
376 xprt->xpt_auth_cache = NULL;
377 spin_unlock(&xprt->xpt_lock);
378 cache_put(&ipm->h, sn->ip_map_cache);
379 return NULL;
380 }
381 cache_get(&ipm->h);
382 }
383 spin_unlock(&xprt->xpt_lock);
384 }
385 return ipm;
386}
387
388static inline void
389ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
390{
391 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
392 spin_lock(&xprt->xpt_lock);
393 if (xprt->xpt_auth_cache == NULL) {
394 /* newly cached, keep the reference */
395 xprt->xpt_auth_cache = ipm;
396 ipm = NULL;
397 }
398 spin_unlock(&xprt->xpt_lock);
399 }
400 if (ipm) {
401 struct sunrpc_net *sn;
402
403 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
404 cache_put(&ipm->h, sn->ip_map_cache);
405 }
406}
407
408void
409svcauth_unix_info_release(struct svc_xprt *xpt)
410{
411 struct ip_map *ipm;
412
413 ipm = xpt->xpt_auth_cache;
414 if (ipm != NULL) {
415 struct sunrpc_net *sn;
416
417 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
418 cache_put(&ipm->h, sn->ip_map_cache);
419 }
420}
421
422/****************************************************************************
423 * auth.unix.gid cache
424 * simple cache to map a UID to a list of GIDs
425 * because AUTH_UNIX aka AUTH_SYS has a max of 16
426 */
427#define GID_HASHBITS 8
428#define GID_HASHMAX (1<<GID_HASHBITS)
429
430struct unix_gid {
431 struct cache_head h;
432 uid_t uid;
433 struct group_info *gi;
434};
435
436static void unix_gid_put(struct kref *kref)
437{
438 struct cache_head *item = container_of(kref, struct cache_head, ref);
439 struct unix_gid *ug = container_of(item, struct unix_gid, h);
440 if (test_bit(CACHE_VALID, &item->flags) &&
441 !test_bit(CACHE_NEGATIVE, &item->flags))
442 put_group_info(ug->gi);
443 kfree(ug);
444}
445
446static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
447{
448 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
449 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
450 return orig->uid == new->uid;
451}
452static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
453{
454 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
455 struct unix_gid *item = container_of(citem, struct unix_gid, h);
456 new->uid = item->uid;
457}
458static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
459{
460 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
461 struct unix_gid *item = container_of(citem, struct unix_gid, h);
462
463 get_group_info(item->gi);
464 new->gi = item->gi;
465}
466static struct cache_head *unix_gid_alloc(void)
467{
468 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
469 if (g)
470 return &g->h;
471 else
472 return NULL;
473}
474
475static void unix_gid_request(struct cache_detail *cd,
476 struct cache_head *h,
477 char **bpp, int *blen)
478{
479 char tuid[20];
480 struct unix_gid *ug = container_of(h, struct unix_gid, h);
481
482 snprintf(tuid, 20, "%u", ug->uid);
483 qword_add(bpp, blen, tuid);
484 (*bpp)[-1] = '\n';
485}
486
487static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
488{
489 return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
490}
491
492static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid);
493
494static int unix_gid_parse(struct cache_detail *cd,
495 char *mesg, int mlen)
496{
497 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
498 int uid;
499 int gids;
500 int rv;
501 int i;
502 int err;
503 time_t expiry;
504 struct unix_gid ug, *ugp;
505
506 if (mesg[mlen - 1] != '\n')
507 return -EINVAL;
508 mesg[mlen-1] = 0;
509
510 rv = get_int(&mesg, &uid);
511 if (rv)
512 return -EINVAL;
513 ug.uid = uid;
514
515 expiry = get_expiry(&mesg);
516 if (expiry == 0)
517 return -EINVAL;
518
519 rv = get_int(&mesg, &gids);
520 if (rv || gids < 0 || gids > 8192)
521 return -EINVAL;
522
523 ug.gi = groups_alloc(gids);
524 if (!ug.gi)
525 return -ENOMEM;
526
527 for (i = 0 ; i < gids ; i++) {
528 int gid;
529 kgid_t kgid;
530 rv = get_int(&mesg, &gid);
531 err = -EINVAL;
532 if (rv)
533 goto out;
534 kgid = make_kgid(&init_user_ns, gid);
535 if (!gid_valid(kgid))
536 goto out;
537 GROUP_AT(ug.gi, i) = kgid;
538 }
539
540 ugp = unix_gid_lookup(cd, uid);
541 if (ugp) {
542 struct cache_head *ch;
543 ug.h.flags = 0;
544 ug.h.expiry_time = expiry;
545 ch = sunrpc_cache_update(cd,
546 &ug.h, &ugp->h,
547 hash_long(uid, GID_HASHBITS));
548 if (!ch)
549 err = -ENOMEM;
550 else {
551 err = 0;
552 cache_put(ch, cd);
553 }
554 } else
555 err = -ENOMEM;
556 out:
557 if (ug.gi)
558 put_group_info(ug.gi);
559 return err;
560}
561
562static int unix_gid_show(struct seq_file *m,
563 struct cache_detail *cd,
564 struct cache_head *h)
565{
566 struct user_namespace *user_ns = current_user_ns();
567 struct unix_gid *ug;
568 int i;
569 int glen;
570
571 if (h == NULL) {
572 seq_puts(m, "#uid cnt: gids...\n");
573 return 0;
574 }
575 ug = container_of(h, struct unix_gid, h);
576 if (test_bit(CACHE_VALID, &h->flags) &&
577 !test_bit(CACHE_NEGATIVE, &h->flags))
578 glen = ug->gi->ngroups;
579 else
580 glen = 0;
581
582 seq_printf(m, "%u %d:", ug->uid, glen);
583 for (i = 0; i < glen; i++)
584 seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
585 seq_printf(m, "\n");
586 return 0;
587}
588
589static struct cache_detail unix_gid_cache_template = {
590 .owner = THIS_MODULE,
591 .hash_size = GID_HASHMAX,
592 .name = "auth.unix.gid",
593 .cache_put = unix_gid_put,
594 .cache_upcall = unix_gid_upcall,
595 .cache_parse = unix_gid_parse,
596 .cache_show = unix_gid_show,
597 .match = unix_gid_match,
598 .init = unix_gid_init,
599 .update = unix_gid_update,
600 .alloc = unix_gid_alloc,
601};
602
603int unix_gid_cache_create(struct net *net)
604{
605 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
606 struct cache_detail *cd;
607 int err;
608
609 cd = cache_create_net(&unix_gid_cache_template, net);
610 if (IS_ERR(cd))
611 return PTR_ERR(cd);
612 err = cache_register_net(cd, net);
613 if (err) {
614 cache_destroy_net(cd, net);
615 return err;
616 }
617 sn->unix_gid_cache = cd;
618 return 0;
619}
620
621void unix_gid_cache_destroy(struct net *net)
622{
623 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
624 struct cache_detail *cd = sn->unix_gid_cache;
625
626 sn->unix_gid_cache = NULL;
627 cache_purge(cd);
628 cache_unregister_net(cd, net);
629 cache_destroy_net(cd, net);
630}
631
632static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid)
633{
634 struct unix_gid ug;
635 struct cache_head *ch;
636
637 ug.uid = uid;
638 ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
639 if (ch)
640 return container_of(ch, struct unix_gid, h);
641 else
642 return NULL;
643}
644
645static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
646{
647 struct unix_gid *ug;
648 struct group_info *gi;
649 int ret;
650 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
651 sunrpc_net_id);
652
653 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
654 if (!ug)
655 return ERR_PTR(-EAGAIN);
656 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
657 switch (ret) {
658 case -ENOENT:
659 return ERR_PTR(-ENOENT);
660 case -ETIMEDOUT:
661 return ERR_PTR(-ESHUTDOWN);
662 case 0:
663 gi = get_group_info(ug->gi);
664 cache_put(&ug->h, sn->unix_gid_cache);
665 return gi;
666 default:
667 return ERR_PTR(-EAGAIN);
668 }
669}
670
671int
672svcauth_unix_set_client(struct svc_rqst *rqstp)
673{
674 struct sockaddr_in *sin;
675 struct sockaddr_in6 *sin6, sin6_storage;
676 struct ip_map *ipm;
677 struct group_info *gi;
678 struct svc_cred *cred = &rqstp->rq_cred;
679 struct svc_xprt *xprt = rqstp->rq_xprt;
680 struct net *net = xprt->xpt_net;
681 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
682
683 switch (rqstp->rq_addr.ss_family) {
684 case AF_INET:
685 sin = svc_addr_in(rqstp);
686 sin6 = &sin6_storage;
687 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
688 break;
689 case AF_INET6:
690 sin6 = svc_addr_in6(rqstp);
691 break;
692 default:
693 BUG();
694 }
695
696 rqstp->rq_client = NULL;
697 if (rqstp->rq_proc == 0)
698 return SVC_OK;
699
700 ipm = ip_map_cached_get(xprt);
701 if (ipm == NULL)
702 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
703 &sin6->sin6_addr);
704
705 if (ipm == NULL)
706 return SVC_DENIED;
707
708 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
709 default:
710 BUG();
711 case -ETIMEDOUT:
712 return SVC_CLOSE;
713 case -EAGAIN:
714 return SVC_DROP;
715 case -ENOENT:
716 return SVC_DENIED;
717 case 0:
718 rqstp->rq_client = &ipm->m_client->h;
719 kref_get(&rqstp->rq_client->ref);
720 ip_map_cached_put(xprt, ipm);
721 break;
722 }
723
724 gi = unix_gid_find(cred->cr_uid, rqstp);
725 switch (PTR_ERR(gi)) {
726 case -EAGAIN:
727 return SVC_DROP;
728 case -ESHUTDOWN:
729 return SVC_CLOSE;
730 case -ENOENT:
731 break;
732 default:
733 put_group_info(cred->cr_group_info);
734 cred->cr_group_info = gi;
735 }
736 return SVC_OK;
737}
738
739EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
740
741static int
742svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
743{
744 struct kvec *argv = &rqstp->rq_arg.head[0];
745 struct kvec *resv = &rqstp->rq_res.head[0];
746 struct svc_cred *cred = &rqstp->rq_cred;
747
748 cred->cr_group_info = NULL;
749 cred->cr_principal = NULL;
750 rqstp->rq_client = NULL;
751
752 if (argv->iov_len < 3*4)
753 return SVC_GARBAGE;
754
755 if (svc_getu32(argv) != 0) {
756 dprintk("svc: bad null cred\n");
757 *authp = rpc_autherr_badcred;
758 return SVC_DENIED;
759 }
760 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
761 dprintk("svc: bad null verf\n");
762 *authp = rpc_autherr_badverf;
763 return SVC_DENIED;
764 }
765
766 /* Signal that mapping to nobody uid/gid is required */
767 cred->cr_uid = (uid_t) -1;
768 cred->cr_gid = (gid_t) -1;
769 cred->cr_group_info = groups_alloc(0);
770 if (cred->cr_group_info == NULL)
771 return SVC_CLOSE; /* kmalloc failure - client must retry */
772
773 /* Put NULL verifier */
774 svc_putnl(resv, RPC_AUTH_NULL);
775 svc_putnl(resv, 0);
776
777 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
778 return SVC_OK;
779}
780
781static int
782svcauth_null_release(struct svc_rqst *rqstp)
783{
784 if (rqstp->rq_client)
785 auth_domain_put(rqstp->rq_client);
786 rqstp->rq_client = NULL;
787 if (rqstp->rq_cred.cr_group_info)
788 put_group_info(rqstp->rq_cred.cr_group_info);
789 rqstp->rq_cred.cr_group_info = NULL;
790
791 return 0; /* don't drop */
792}
793
794
795struct auth_ops svcauth_null = {
796 .name = "null",
797 .owner = THIS_MODULE,
798 .flavour = RPC_AUTH_NULL,
799 .accept = svcauth_null_accept,
800 .release = svcauth_null_release,
801 .set_client = svcauth_unix_set_client,
802};
803
804
805static int
806svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
807{
808 struct kvec *argv = &rqstp->rq_arg.head[0];
809 struct kvec *resv = &rqstp->rq_res.head[0];
810 struct svc_cred *cred = &rqstp->rq_cred;
811 u32 slen, i;
812 int len = argv->iov_len;
813
814 cred->cr_group_info = NULL;
815 cred->cr_principal = NULL;
816 rqstp->rq_client = NULL;
817
818 if ((len -= 3*4) < 0)
819 return SVC_GARBAGE;
820
821 svc_getu32(argv); /* length */
822 svc_getu32(argv); /* time stamp */
823 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
824 if (slen > 64 || (len -= (slen + 3)*4) < 0)
825 goto badcred;
826 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
827 argv->iov_len -= slen*4;
828
829 cred->cr_uid = svc_getnl(argv); /* uid */
830 cred->cr_gid = svc_getnl(argv); /* gid */
831 slen = svc_getnl(argv); /* gids length */
832 if (slen > 16 || (len -= (slen + 2)*4) < 0)
833 goto badcred;
834 cred->cr_group_info = groups_alloc(slen);
835 if (cred->cr_group_info == NULL)
836 return SVC_CLOSE;
837 for (i = 0; i < slen; i++) {
838 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
839 if (!gid_valid(kgid))
840 goto badcred;
841 GROUP_AT(cred->cr_group_info, i) = kgid;
842 }
843 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
844 *authp = rpc_autherr_badverf;
845 return SVC_DENIED;
846 }
847
848 /* Put NULL verifier */
849 svc_putnl(resv, RPC_AUTH_NULL);
850 svc_putnl(resv, 0);
851
852 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
853 return SVC_OK;
854
855badcred:
856 *authp = rpc_autherr_badcred;
857 return SVC_DENIED;
858}
859
860static int
861svcauth_unix_release(struct svc_rqst *rqstp)
862{
863 /* Verifier (such as it is) is already in place.
864 */
865 if (rqstp->rq_client)
866 auth_domain_put(rqstp->rq_client);
867 rqstp->rq_client = NULL;
868 if (rqstp->rq_cred.cr_group_info)
869 put_group_info(rqstp->rq_cred.cr_group_info);
870 rqstp->rq_cred.cr_group_info = NULL;
871
872 return 0;
873}
874
875
876struct auth_ops svcauth_unix = {
877 .name = "unix",
878 .owner = THIS_MODULE,
879 .flavour = RPC_AUTH_UNIX,
880 .accept = svcauth_unix_accept,
881 .release = svcauth_unix_release,
882 .domain_release = svcauth_unix_domain_release,
883 .set_client = svcauth_unix_set_client,
884};
885
886static struct cache_detail ip_map_cache_template = {
887 .owner = THIS_MODULE,
888 .hash_size = IP_HASHMAX,
889 .name = "auth.unix.ip",
890 .cache_put = ip_map_put,
891 .cache_upcall = ip_map_upcall,
892 .cache_parse = ip_map_parse,
893 .cache_show = ip_map_show,
894 .match = ip_map_match,
895 .init = ip_map_init,
896 .update = update,
897 .alloc = ip_map_alloc,
898};
899
900int ip_map_cache_create(struct net *net)
901{
902 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
903 struct cache_detail *cd;
904 int err;
905
906 cd = cache_create_net(&ip_map_cache_template, net);
907 if (IS_ERR(cd))
908 return PTR_ERR(cd);
909 err = cache_register_net(cd, net);
910 if (err) {
911 cache_destroy_net(cd, net);
912 return err;
913 }
914 sn->ip_map_cache = cd;
915 return 0;
916}
917
918void ip_map_cache_destroy(struct net *net)
919{
920 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
921 struct cache_detail *cd = sn->ip_map_cache;
922
923 sn->ip_map_cache = NULL;
924 cache_purge(cd);
925 cache_unregister_net(cd, net);
926 cache_destroy_net(cd, net);
927}