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1#include <linux/types.h>
2#include <linux/sched.h>
3#include <linux/module.h>
4#include <linux/sunrpc/types.h>
5#include <linux/sunrpc/xdr.h>
6#include <linux/sunrpc/svcsock.h>
7#include <linux/sunrpc/svcauth.h>
8#include <linux/sunrpc/gss_api.h>
9#include <linux/sunrpc/addr.h>
10#include <linux/err.h>
11#include <linux/seq_file.h>
12#include <linux/hash.h>
13#include <linux/string.h>
14#include <linux/slab.h>
15#include <net/sock.h>
16#include <net/ipv6.h>
17#include <linux/kernel.h>
18#include <linux/user_namespace.h>
19#define RPCDBG_FACILITY RPCDBG_AUTH
20
21
22#include "netns.h"
23
24/*
25 * AUTHUNIX and AUTHNULL credentials are both handled here.
26 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
27 * are always nobody (-2). i.e. we do the same IP address checks for
28 * AUTHNULL as for AUTHUNIX, and that is done here.
29 */
30
31
32struct unix_domain {
33 struct auth_domain h;
34 /* other stuff later */
35};
36
37extern struct auth_ops svcauth_null;
38extern struct auth_ops svcauth_unix;
39
40static void svcauth_unix_domain_release(struct auth_domain *dom)
41{
42 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
43
44 kfree(dom->name);
45 kfree(ud);
46}
47
48struct auth_domain *unix_domain_find(char *name)
49{
50 struct auth_domain *rv;
51 struct unix_domain *new = NULL;
52
53 rv = auth_domain_lookup(name, NULL);
54 while(1) {
55 if (rv) {
56 if (new && rv != &new->h)
57 svcauth_unix_domain_release(&new->h);
58
59 if (rv->flavour != &svcauth_unix) {
60 auth_domain_put(rv);
61 return NULL;
62 }
63 return rv;
64 }
65
66 new = kmalloc(sizeof(*new), GFP_KERNEL);
67 if (new == NULL)
68 return NULL;
69 kref_init(&new->h.ref);
70 new->h.name = kstrdup(name, GFP_KERNEL);
71 if (new->h.name == NULL) {
72 kfree(new);
73 return NULL;
74 }
75 new->h.flavour = &svcauth_unix;
76 rv = auth_domain_lookup(name, &new->h);
77 }
78}
79EXPORT_SYMBOL_GPL(unix_domain_find);
80
81
82/**************************************************
83 * cache for IP address to unix_domain
84 * as needed by AUTH_UNIX
85 */
86#define IP_HASHBITS 8
87#define IP_HASHMAX (1<<IP_HASHBITS)
88
89struct ip_map {
90 struct cache_head h;
91 char m_class[8]; /* e.g. "nfsd" */
92 struct in6_addr m_addr;
93 struct unix_domain *m_client;
94};
95
96static void ip_map_put(struct kref *kref)
97{
98 struct cache_head *item = container_of(kref, struct cache_head, ref);
99 struct ip_map *im = container_of(item, struct ip_map,h);
100
101 if (test_bit(CACHE_VALID, &item->flags) &&
102 !test_bit(CACHE_NEGATIVE, &item->flags))
103 auth_domain_put(&im->m_client->h);
104 kfree(im);
105}
106
107static inline int hash_ip6(const struct in6_addr *ip)
108{
109 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
110}
111static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
112{
113 struct ip_map *orig = container_of(corig, struct ip_map, h);
114 struct ip_map *new = container_of(cnew, struct ip_map, h);
115 return strcmp(orig->m_class, new->m_class) == 0 &&
116 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
117}
118static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
119{
120 struct ip_map *new = container_of(cnew, struct ip_map, h);
121 struct ip_map *item = container_of(citem, struct ip_map, h);
122
123 strcpy(new->m_class, item->m_class);
124 new->m_addr = item->m_addr;
125}
126static void update(struct cache_head *cnew, struct cache_head *citem)
127{
128 struct ip_map *new = container_of(cnew, struct ip_map, h);
129 struct ip_map *item = container_of(citem, struct ip_map, h);
130
131 kref_get(&item->m_client->h.ref);
132 new->m_client = item->m_client;
133}
134static struct cache_head *ip_map_alloc(void)
135{
136 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
137 if (i)
138 return &i->h;
139 else
140 return NULL;
141}
142
143static void ip_map_request(struct cache_detail *cd,
144 struct cache_head *h,
145 char **bpp, int *blen)
146{
147 char text_addr[40];
148 struct ip_map *im = container_of(h, struct ip_map, h);
149
150 if (ipv6_addr_v4mapped(&(im->m_addr))) {
151 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
152 } else {
153 snprintf(text_addr, 40, "%pI6", &im->m_addr);
154 }
155 qword_add(bpp, blen, im->m_class);
156 qword_add(bpp, blen, text_addr);
157 (*bpp)[-1] = '\n';
158}
159
160static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
161static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
162
163static int ip_map_parse(struct cache_detail *cd,
164 char *mesg, int mlen)
165{
166 /* class ipaddress [domainname] */
167 /* should be safe just to use the start of the input buffer
168 * for scratch: */
169 char *buf = mesg;
170 int len;
171 char class[8];
172 union {
173 struct sockaddr sa;
174 struct sockaddr_in s4;
175 struct sockaddr_in6 s6;
176 } address;
177 struct sockaddr_in6 sin6;
178 int err;
179
180 struct ip_map *ipmp;
181 struct auth_domain *dom;
182 time_t expiry;
183
184 if (mesg[mlen-1] != '\n')
185 return -EINVAL;
186 mesg[mlen-1] = 0;
187
188 /* class */
189 len = qword_get(&mesg, class, sizeof(class));
190 if (len <= 0) return -EINVAL;
191
192 /* ip address */
193 len = qword_get(&mesg, buf, mlen);
194 if (len <= 0) return -EINVAL;
195
196 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
197 return -EINVAL;
198 switch (address.sa.sa_family) {
199 case AF_INET:
200 /* Form a mapped IPv4 address in sin6 */
201 sin6.sin6_family = AF_INET6;
202 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
203 &sin6.sin6_addr);
204 break;
205#if IS_ENABLED(CONFIG_IPV6)
206 case AF_INET6:
207 memcpy(&sin6, &address.s6, sizeof(sin6));
208 break;
209#endif
210 default:
211 return -EINVAL;
212 }
213
214 expiry = get_expiry(&mesg);
215 if (expiry ==0)
216 return -EINVAL;
217
218 /* domainname, or empty for NEGATIVE */
219 len = qword_get(&mesg, buf, mlen);
220 if (len < 0) return -EINVAL;
221
222 if (len) {
223 dom = unix_domain_find(buf);
224 if (dom == NULL)
225 return -ENOENT;
226 } else
227 dom = NULL;
228
229 /* IPv6 scope IDs are ignored for now */
230 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
231 if (ipmp) {
232 err = __ip_map_update(cd, ipmp,
233 container_of(dom, struct unix_domain, h),
234 expiry);
235 } else
236 err = -ENOMEM;
237
238 if (dom)
239 auth_domain_put(dom);
240
241 cache_flush();
242 return err;
243}
244
245static int ip_map_show(struct seq_file *m,
246 struct cache_detail *cd,
247 struct cache_head *h)
248{
249 struct ip_map *im;
250 struct in6_addr addr;
251 char *dom = "-no-domain-";
252
253 if (h == NULL) {
254 seq_puts(m, "#class IP domain\n");
255 return 0;
256 }
257 im = container_of(h, struct ip_map, h);
258 /* class addr domain */
259 addr = im->m_addr;
260
261 if (test_bit(CACHE_VALID, &h->flags) &&
262 !test_bit(CACHE_NEGATIVE, &h->flags))
263 dom = im->m_client->h.name;
264
265 if (ipv6_addr_v4mapped(&addr)) {
266 seq_printf(m, "%s %pI4 %s\n",
267 im->m_class, &addr.s6_addr32[3], dom);
268 } else {
269 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
270 }
271 return 0;
272}
273
274
275static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
276 struct in6_addr *addr)
277{
278 struct ip_map ip;
279 struct cache_head *ch;
280
281 strcpy(ip.m_class, class);
282 ip.m_addr = *addr;
283 ch = sunrpc_cache_lookup(cd, &ip.h,
284 hash_str(class, IP_HASHBITS) ^
285 hash_ip6(addr));
286
287 if (ch)
288 return container_of(ch, struct ip_map, h);
289 else
290 return NULL;
291}
292
293static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
294 struct in6_addr *addr)
295{
296 struct sunrpc_net *sn;
297
298 sn = net_generic(net, sunrpc_net_id);
299 return __ip_map_lookup(sn->ip_map_cache, class, addr);
300}
301
302static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
303 struct unix_domain *udom, time_t expiry)
304{
305 struct ip_map ip;
306 struct cache_head *ch;
307
308 ip.m_client = udom;
309 ip.h.flags = 0;
310 if (!udom)
311 set_bit(CACHE_NEGATIVE, &ip.h.flags);
312 ip.h.expiry_time = expiry;
313 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
314 hash_str(ipm->m_class, IP_HASHBITS) ^
315 hash_ip6(&ipm->m_addr));
316 if (!ch)
317 return -ENOMEM;
318 cache_put(ch, cd);
319 return 0;
320}
321
322static inline int ip_map_update(struct net *net, struct ip_map *ipm,
323 struct unix_domain *udom, time_t expiry)
324{
325 struct sunrpc_net *sn;
326
327 sn = net_generic(net, sunrpc_net_id);
328 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
329}
330
331void svcauth_unix_purge(struct net *net)
332{
333 struct sunrpc_net *sn;
334
335 sn = net_generic(net, sunrpc_net_id);
336 cache_purge(sn->ip_map_cache);
337}
338EXPORT_SYMBOL_GPL(svcauth_unix_purge);
339
340static inline struct ip_map *
341ip_map_cached_get(struct svc_xprt *xprt)
342{
343 struct ip_map *ipm = NULL;
344 struct sunrpc_net *sn;
345
346 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
347 spin_lock(&xprt->xpt_lock);
348 ipm = xprt->xpt_auth_cache;
349 if (ipm != NULL) {
350 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
351 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
352 /*
353 * The entry has been invalidated since it was
354 * remembered, e.g. by a second mount from the
355 * same IP address.
356 */
357 xprt->xpt_auth_cache = NULL;
358 spin_unlock(&xprt->xpt_lock);
359 cache_put(&ipm->h, sn->ip_map_cache);
360 return NULL;
361 }
362 cache_get(&ipm->h);
363 }
364 spin_unlock(&xprt->xpt_lock);
365 }
366 return ipm;
367}
368
369static inline void
370ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
371{
372 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
373 spin_lock(&xprt->xpt_lock);
374 if (xprt->xpt_auth_cache == NULL) {
375 /* newly cached, keep the reference */
376 xprt->xpt_auth_cache = ipm;
377 ipm = NULL;
378 }
379 spin_unlock(&xprt->xpt_lock);
380 }
381 if (ipm) {
382 struct sunrpc_net *sn;
383
384 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
385 cache_put(&ipm->h, sn->ip_map_cache);
386 }
387}
388
389void
390svcauth_unix_info_release(struct svc_xprt *xpt)
391{
392 struct ip_map *ipm;
393
394 ipm = xpt->xpt_auth_cache;
395 if (ipm != NULL) {
396 struct sunrpc_net *sn;
397
398 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
399 cache_put(&ipm->h, sn->ip_map_cache);
400 }
401}
402
403/****************************************************************************
404 * auth.unix.gid cache
405 * simple cache to map a UID to a list of GIDs
406 * because AUTH_UNIX aka AUTH_SYS has a max of 16
407 */
408#define GID_HASHBITS 8
409#define GID_HASHMAX (1<<GID_HASHBITS)
410
411struct unix_gid {
412 struct cache_head h;
413 kuid_t uid;
414 struct group_info *gi;
415};
416
417static int unix_gid_hash(kuid_t uid)
418{
419 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
420}
421
422static void unix_gid_put(struct kref *kref)
423{
424 struct cache_head *item = container_of(kref, struct cache_head, ref);
425 struct unix_gid *ug = container_of(item, struct unix_gid, h);
426 if (test_bit(CACHE_VALID, &item->flags) &&
427 !test_bit(CACHE_NEGATIVE, &item->flags))
428 put_group_info(ug->gi);
429 kfree(ug);
430}
431
432static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
433{
434 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
435 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
436 return uid_eq(orig->uid, new->uid);
437}
438static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
439{
440 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
441 struct unix_gid *item = container_of(citem, struct unix_gid, h);
442 new->uid = item->uid;
443}
444static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
445{
446 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
447 struct unix_gid *item = container_of(citem, struct unix_gid, h);
448
449 get_group_info(item->gi);
450 new->gi = item->gi;
451}
452static struct cache_head *unix_gid_alloc(void)
453{
454 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
455 if (g)
456 return &g->h;
457 else
458 return NULL;
459}
460
461static void unix_gid_request(struct cache_detail *cd,
462 struct cache_head *h,
463 char **bpp, int *blen)
464{
465 char tuid[20];
466 struct unix_gid *ug = container_of(h, struct unix_gid, h);
467
468 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
469 qword_add(bpp, blen, tuid);
470 (*bpp)[-1] = '\n';
471}
472
473static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
474
475static int unix_gid_parse(struct cache_detail *cd,
476 char *mesg, int mlen)
477{
478 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
479 int id;
480 kuid_t uid;
481 int gids;
482 int rv;
483 int i;
484 int err;
485 time_t expiry;
486 struct unix_gid ug, *ugp;
487
488 if (mesg[mlen - 1] != '\n')
489 return -EINVAL;
490 mesg[mlen-1] = 0;
491
492 rv = get_int(&mesg, &id);
493 if (rv)
494 return -EINVAL;
495 uid = make_kuid(&init_user_ns, id);
496 ug.uid = uid;
497
498 expiry = get_expiry(&mesg);
499 if (expiry == 0)
500 return -EINVAL;
501
502 rv = get_int(&mesg, &gids);
503 if (rv || gids < 0 || gids > 8192)
504 return -EINVAL;
505
506 ug.gi = groups_alloc(gids);
507 if (!ug.gi)
508 return -ENOMEM;
509
510 for (i = 0 ; i < gids ; i++) {
511 int gid;
512 kgid_t kgid;
513 rv = get_int(&mesg, &gid);
514 err = -EINVAL;
515 if (rv)
516 goto out;
517 kgid = make_kgid(&init_user_ns, gid);
518 if (!gid_valid(kgid))
519 goto out;
520 GROUP_AT(ug.gi, i) = kgid;
521 }
522
523 ugp = unix_gid_lookup(cd, uid);
524 if (ugp) {
525 struct cache_head *ch;
526 ug.h.flags = 0;
527 ug.h.expiry_time = expiry;
528 ch = sunrpc_cache_update(cd,
529 &ug.h, &ugp->h,
530 unix_gid_hash(uid));
531 if (!ch)
532 err = -ENOMEM;
533 else {
534 err = 0;
535 cache_put(ch, cd);
536 }
537 } else
538 err = -ENOMEM;
539 out:
540 if (ug.gi)
541 put_group_info(ug.gi);
542 return err;
543}
544
545static int unix_gid_show(struct seq_file *m,
546 struct cache_detail *cd,
547 struct cache_head *h)
548{
549 struct user_namespace *user_ns = &init_user_ns;
550 struct unix_gid *ug;
551 int i;
552 int glen;
553
554 if (h == NULL) {
555 seq_puts(m, "#uid cnt: gids...\n");
556 return 0;
557 }
558 ug = container_of(h, struct unix_gid, h);
559 if (test_bit(CACHE_VALID, &h->flags) &&
560 !test_bit(CACHE_NEGATIVE, &h->flags))
561 glen = ug->gi->ngroups;
562 else
563 glen = 0;
564
565 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
566 for (i = 0; i < glen; i++)
567 seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
568 seq_printf(m, "\n");
569 return 0;
570}
571
572static struct cache_detail unix_gid_cache_template = {
573 .owner = THIS_MODULE,
574 .hash_size = GID_HASHMAX,
575 .name = "auth.unix.gid",
576 .cache_put = unix_gid_put,
577 .cache_request = unix_gid_request,
578 .cache_parse = unix_gid_parse,
579 .cache_show = unix_gid_show,
580 .match = unix_gid_match,
581 .init = unix_gid_init,
582 .update = unix_gid_update,
583 .alloc = unix_gid_alloc,
584};
585
586int unix_gid_cache_create(struct net *net)
587{
588 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
589 struct cache_detail *cd;
590 int err;
591
592 cd = cache_create_net(&unix_gid_cache_template, net);
593 if (IS_ERR(cd))
594 return PTR_ERR(cd);
595 err = cache_register_net(cd, net);
596 if (err) {
597 cache_destroy_net(cd, net);
598 return err;
599 }
600 sn->unix_gid_cache = cd;
601 return 0;
602}
603
604void unix_gid_cache_destroy(struct net *net)
605{
606 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
607 struct cache_detail *cd = sn->unix_gid_cache;
608
609 sn->unix_gid_cache = NULL;
610 cache_purge(cd);
611 cache_unregister_net(cd, net);
612 cache_destroy_net(cd, net);
613}
614
615static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
616{
617 struct unix_gid ug;
618 struct cache_head *ch;
619
620 ug.uid = uid;
621 ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
622 if (ch)
623 return container_of(ch, struct unix_gid, h);
624 else
625 return NULL;
626}
627
628static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
629{
630 struct unix_gid *ug;
631 struct group_info *gi;
632 int ret;
633 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
634 sunrpc_net_id);
635
636 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
637 if (!ug)
638 return ERR_PTR(-EAGAIN);
639 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
640 switch (ret) {
641 case -ENOENT:
642 return ERR_PTR(-ENOENT);
643 case -ETIMEDOUT:
644 return ERR_PTR(-ESHUTDOWN);
645 case 0:
646 gi = get_group_info(ug->gi);
647 cache_put(&ug->h, sn->unix_gid_cache);
648 return gi;
649 default:
650 return ERR_PTR(-EAGAIN);
651 }
652}
653
654int
655svcauth_unix_set_client(struct svc_rqst *rqstp)
656{
657 struct sockaddr_in *sin;
658 struct sockaddr_in6 *sin6, sin6_storage;
659 struct ip_map *ipm;
660 struct group_info *gi;
661 struct svc_cred *cred = &rqstp->rq_cred;
662 struct svc_xprt *xprt = rqstp->rq_xprt;
663 struct net *net = xprt->xpt_net;
664 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
665
666 switch (rqstp->rq_addr.ss_family) {
667 case AF_INET:
668 sin = svc_addr_in(rqstp);
669 sin6 = &sin6_storage;
670 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
671 break;
672 case AF_INET6:
673 sin6 = svc_addr_in6(rqstp);
674 break;
675 default:
676 BUG();
677 }
678
679 rqstp->rq_client = NULL;
680 if (rqstp->rq_proc == 0)
681 return SVC_OK;
682
683 ipm = ip_map_cached_get(xprt);
684 if (ipm == NULL)
685 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
686 &sin6->sin6_addr);
687
688 if (ipm == NULL)
689 return SVC_DENIED;
690
691 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
692 default:
693 BUG();
694 case -ETIMEDOUT:
695 return SVC_CLOSE;
696 case -EAGAIN:
697 return SVC_DROP;
698 case -ENOENT:
699 return SVC_DENIED;
700 case 0:
701 rqstp->rq_client = &ipm->m_client->h;
702 kref_get(&rqstp->rq_client->ref);
703 ip_map_cached_put(xprt, ipm);
704 break;
705 }
706
707 gi = unix_gid_find(cred->cr_uid, rqstp);
708 switch (PTR_ERR(gi)) {
709 case -EAGAIN:
710 return SVC_DROP;
711 case -ESHUTDOWN:
712 return SVC_CLOSE;
713 case -ENOENT:
714 break;
715 default:
716 put_group_info(cred->cr_group_info);
717 cred->cr_group_info = gi;
718 }
719 return SVC_OK;
720}
721
722EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
723
724static int
725svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
726{
727 struct kvec *argv = &rqstp->rq_arg.head[0];
728 struct kvec *resv = &rqstp->rq_res.head[0];
729 struct svc_cred *cred = &rqstp->rq_cred;
730
731 if (argv->iov_len < 3*4)
732 return SVC_GARBAGE;
733
734 if (svc_getu32(argv) != 0) {
735 dprintk("svc: bad null cred\n");
736 *authp = rpc_autherr_badcred;
737 return SVC_DENIED;
738 }
739 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
740 dprintk("svc: bad null verf\n");
741 *authp = rpc_autherr_badverf;
742 return SVC_DENIED;
743 }
744
745 /* Signal that mapping to nobody uid/gid is required */
746 cred->cr_uid = INVALID_UID;
747 cred->cr_gid = INVALID_GID;
748 cred->cr_group_info = groups_alloc(0);
749 if (cred->cr_group_info == NULL)
750 return SVC_CLOSE; /* kmalloc failure - client must retry */
751
752 /* Put NULL verifier */
753 svc_putnl(resv, RPC_AUTH_NULL);
754 svc_putnl(resv, 0);
755
756 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
757 return SVC_OK;
758}
759
760static int
761svcauth_null_release(struct svc_rqst *rqstp)
762{
763 if (rqstp->rq_client)
764 auth_domain_put(rqstp->rq_client);
765 rqstp->rq_client = NULL;
766 if (rqstp->rq_cred.cr_group_info)
767 put_group_info(rqstp->rq_cred.cr_group_info);
768 rqstp->rq_cred.cr_group_info = NULL;
769
770 return 0; /* don't drop */
771}
772
773
774struct auth_ops svcauth_null = {
775 .name = "null",
776 .owner = THIS_MODULE,
777 .flavour = RPC_AUTH_NULL,
778 .accept = svcauth_null_accept,
779 .release = svcauth_null_release,
780 .set_client = svcauth_unix_set_client,
781};
782
783
784static int
785svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
786{
787 struct kvec *argv = &rqstp->rq_arg.head[0];
788 struct kvec *resv = &rqstp->rq_res.head[0];
789 struct svc_cred *cred = &rqstp->rq_cred;
790 u32 slen, i;
791 int len = argv->iov_len;
792
793 if ((len -= 3*4) < 0)
794 return SVC_GARBAGE;
795
796 svc_getu32(argv); /* length */
797 svc_getu32(argv); /* time stamp */
798 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
799 if (slen > 64 || (len -= (slen + 3)*4) < 0)
800 goto badcred;
801 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
802 argv->iov_len -= slen*4;
803 /*
804 * Note: we skip uid_valid()/gid_valid() checks here for
805 * backwards compatibility with clients that use -1 id's.
806 * Instead, -1 uid or gid is later mapped to the
807 * (export-specific) anonymous id by nfsd_setuser.
808 * Supplementary gid's will be left alone.
809 */
810 cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
811 cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
812 slen = svc_getnl(argv); /* gids length */
813 if (slen > 16 || (len -= (slen + 2)*4) < 0)
814 goto badcred;
815 cred->cr_group_info = groups_alloc(slen);
816 if (cred->cr_group_info == NULL)
817 return SVC_CLOSE;
818 for (i = 0; i < slen; i++) {
819 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
820 GROUP_AT(cred->cr_group_info, i) = kgid;
821 }
822 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
823 *authp = rpc_autherr_badverf;
824 return SVC_DENIED;
825 }
826
827 /* Put NULL verifier */
828 svc_putnl(resv, RPC_AUTH_NULL);
829 svc_putnl(resv, 0);
830
831 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
832 return SVC_OK;
833
834badcred:
835 *authp = rpc_autherr_badcred;
836 return SVC_DENIED;
837}
838
839static int
840svcauth_unix_release(struct svc_rqst *rqstp)
841{
842 /* Verifier (such as it is) is already in place.
843 */
844 if (rqstp->rq_client)
845 auth_domain_put(rqstp->rq_client);
846 rqstp->rq_client = NULL;
847 if (rqstp->rq_cred.cr_group_info)
848 put_group_info(rqstp->rq_cred.cr_group_info);
849 rqstp->rq_cred.cr_group_info = NULL;
850
851 return 0;
852}
853
854
855struct auth_ops svcauth_unix = {
856 .name = "unix",
857 .owner = THIS_MODULE,
858 .flavour = RPC_AUTH_UNIX,
859 .accept = svcauth_unix_accept,
860 .release = svcauth_unix_release,
861 .domain_release = svcauth_unix_domain_release,
862 .set_client = svcauth_unix_set_client,
863};
864
865static struct cache_detail ip_map_cache_template = {
866 .owner = THIS_MODULE,
867 .hash_size = IP_HASHMAX,
868 .name = "auth.unix.ip",
869 .cache_put = ip_map_put,
870 .cache_request = ip_map_request,
871 .cache_parse = ip_map_parse,
872 .cache_show = ip_map_show,
873 .match = ip_map_match,
874 .init = ip_map_init,
875 .update = update,
876 .alloc = ip_map_alloc,
877};
878
879int ip_map_cache_create(struct net *net)
880{
881 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
882 struct cache_detail *cd;
883 int err;
884
885 cd = cache_create_net(&ip_map_cache_template, net);
886 if (IS_ERR(cd))
887 return PTR_ERR(cd);
888 err = cache_register_net(cd, net);
889 if (err) {
890 cache_destroy_net(cd, net);
891 return err;
892 }
893 sn->ip_map_cache = cd;
894 return 0;
895}
896
897void ip_map_cache_destroy(struct net *net)
898{
899 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
900 struct cache_detail *cd = sn->ip_map_cache;
901
902 sn->ip_map_cache = NULL;
903 cache_purge(cd);
904 cache_unregister_net(cd, net);
905 cache_destroy_net(cd, net);
906}
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#include <trace/events/sunrpc.h>
21
22#define RPCDBG_FACILITY RPCDBG_AUTH
23
24#include "netns.h"
25
26/*
27 * AUTHUNIX and AUTHNULL credentials are both handled here.
28 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
29 * are always nobody (-2). i.e. we do the same IP address checks for
30 * AUTHNULL as for AUTHUNIX, and that is done here.
31 */
32
33
34struct unix_domain {
35 struct auth_domain h;
36 /* other stuff later */
37};
38
39extern struct auth_ops svcauth_null;
40extern struct auth_ops svcauth_unix;
41extern struct auth_ops svcauth_tls;
42
43static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
44{
45 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
46 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
47
48 kfree(dom->name);
49 kfree(ud);
50}
51
52static void svcauth_unix_domain_release(struct auth_domain *dom)
53{
54 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
55}
56
57struct auth_domain *unix_domain_find(char *name)
58{
59 struct auth_domain *rv;
60 struct unix_domain *new = NULL;
61
62 rv = auth_domain_find(name);
63 while(1) {
64 if (rv) {
65 if (new && rv != &new->h)
66 svcauth_unix_domain_release(&new->h);
67
68 if (rv->flavour != &svcauth_unix) {
69 auth_domain_put(rv);
70 return NULL;
71 }
72 return rv;
73 }
74
75 new = kmalloc(sizeof(*new), GFP_KERNEL);
76 if (new == NULL)
77 return NULL;
78 kref_init(&new->h.ref);
79 new->h.name = kstrdup(name, GFP_KERNEL);
80 if (new->h.name == NULL) {
81 kfree(new);
82 return NULL;
83 }
84 new->h.flavour = &svcauth_unix;
85 rv = auth_domain_lookup(name, &new->h);
86 }
87}
88EXPORT_SYMBOL_GPL(unix_domain_find);
89
90
91/**************************************************
92 * cache for IP address to unix_domain
93 * as needed by AUTH_UNIX
94 */
95#define IP_HASHBITS 8
96#define IP_HASHMAX (1<<IP_HASHBITS)
97
98struct ip_map {
99 struct cache_head h;
100 char m_class[8]; /* e.g. "nfsd" */
101 struct in6_addr m_addr;
102 struct unix_domain *m_client;
103 struct rcu_head m_rcu;
104};
105
106static void ip_map_put(struct kref *kref)
107{
108 struct cache_head *item = container_of(kref, struct cache_head, ref);
109 struct ip_map *im = container_of(item, struct ip_map,h);
110
111 if (test_bit(CACHE_VALID, &item->flags) &&
112 !test_bit(CACHE_NEGATIVE, &item->flags))
113 auth_domain_put(&im->m_client->h);
114 kfree_rcu(im, m_rcu);
115}
116
117static inline int hash_ip6(const struct in6_addr *ip)
118{
119 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
120}
121static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
122{
123 struct ip_map *orig = container_of(corig, struct ip_map, h);
124 struct ip_map *new = container_of(cnew, struct ip_map, h);
125 return strcmp(orig->m_class, new->m_class) == 0 &&
126 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
127}
128static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
129{
130 struct ip_map *new = container_of(cnew, struct ip_map, h);
131 struct ip_map *item = container_of(citem, struct ip_map, h);
132
133 strcpy(new->m_class, item->m_class);
134 new->m_addr = item->m_addr;
135}
136static void update(struct cache_head *cnew, struct cache_head *citem)
137{
138 struct ip_map *new = container_of(cnew, struct ip_map, h);
139 struct ip_map *item = container_of(citem, struct ip_map, h);
140
141 kref_get(&item->m_client->h.ref);
142 new->m_client = item->m_client;
143}
144static struct cache_head *ip_map_alloc(void)
145{
146 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
147 if (i)
148 return &i->h;
149 else
150 return NULL;
151}
152
153static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
154{
155 return sunrpc_cache_pipe_upcall(cd, h);
156}
157
158static void ip_map_request(struct cache_detail *cd,
159 struct cache_head *h,
160 char **bpp, int *blen)
161{
162 char text_addr[40];
163 struct ip_map *im = container_of(h, struct ip_map, h);
164
165 if (ipv6_addr_v4mapped(&(im->m_addr))) {
166 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
167 } else {
168 snprintf(text_addr, 40, "%pI6", &im->m_addr);
169 }
170 qword_add(bpp, blen, im->m_class);
171 qword_add(bpp, blen, text_addr);
172 (*bpp)[-1] = '\n';
173}
174
175static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
176static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
177
178static int ip_map_parse(struct cache_detail *cd,
179 char *mesg, int mlen)
180{
181 /* class ipaddress [domainname] */
182 /* should be safe just to use the start of the input buffer
183 * for scratch: */
184 char *buf = mesg;
185 int len;
186 char class[8];
187 union {
188 struct sockaddr sa;
189 struct sockaddr_in s4;
190 struct sockaddr_in6 s6;
191 } address;
192 struct sockaddr_in6 sin6;
193 int err;
194
195 struct ip_map *ipmp;
196 struct auth_domain *dom;
197 time64_t expiry;
198
199 if (mesg[mlen-1] != '\n')
200 return -EINVAL;
201 mesg[mlen-1] = 0;
202
203 /* class */
204 len = qword_get(&mesg, class, sizeof(class));
205 if (len <= 0) return -EINVAL;
206
207 /* ip address */
208 len = qword_get(&mesg, buf, mlen);
209 if (len <= 0) return -EINVAL;
210
211 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
212 return -EINVAL;
213 switch (address.sa.sa_family) {
214 case AF_INET:
215 /* Form a mapped IPv4 address in sin6 */
216 sin6.sin6_family = AF_INET6;
217 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
218 &sin6.sin6_addr);
219 break;
220#if IS_ENABLED(CONFIG_IPV6)
221 case AF_INET6:
222 memcpy(&sin6, &address.s6, sizeof(sin6));
223 break;
224#endif
225 default:
226 return -EINVAL;
227 }
228
229 err = get_expiry(&mesg, &expiry);
230 if (err)
231 return err;
232
233 /* domainname, or empty for NEGATIVE */
234 len = qword_get(&mesg, buf, mlen);
235 if (len < 0) return -EINVAL;
236
237 if (len) {
238 dom = unix_domain_find(buf);
239 if (dom == NULL)
240 return -ENOENT;
241 } else
242 dom = NULL;
243
244 /* IPv6 scope IDs are ignored for now */
245 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
246 if (ipmp) {
247 err = __ip_map_update(cd, ipmp,
248 container_of(dom, struct unix_domain, h),
249 expiry);
250 } else
251 err = -ENOMEM;
252
253 if (dom)
254 auth_domain_put(dom);
255
256 cache_flush();
257 return err;
258}
259
260static int ip_map_show(struct seq_file *m,
261 struct cache_detail *cd,
262 struct cache_head *h)
263{
264 struct ip_map *im;
265 struct in6_addr addr;
266 char *dom = "-no-domain-";
267
268 if (h == NULL) {
269 seq_puts(m, "#class IP domain\n");
270 return 0;
271 }
272 im = container_of(h, struct ip_map, h);
273 /* class addr domain */
274 addr = im->m_addr;
275
276 if (test_bit(CACHE_VALID, &h->flags) &&
277 !test_bit(CACHE_NEGATIVE, &h->flags))
278 dom = im->m_client->h.name;
279
280 if (ipv6_addr_v4mapped(&addr)) {
281 seq_printf(m, "%s %pI4 %s\n",
282 im->m_class, &addr.s6_addr32[3], dom);
283 } else {
284 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
285 }
286 return 0;
287}
288
289
290static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
291 struct in6_addr *addr)
292{
293 struct ip_map ip;
294 struct cache_head *ch;
295
296 strcpy(ip.m_class, class);
297 ip.m_addr = *addr;
298 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
299 hash_str(class, IP_HASHBITS) ^
300 hash_ip6(addr));
301
302 if (ch)
303 return container_of(ch, struct ip_map, h);
304 else
305 return NULL;
306}
307
308static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
309 struct unix_domain *udom, time64_t expiry)
310{
311 struct ip_map ip;
312 struct cache_head *ch;
313
314 ip.m_client = udom;
315 ip.h.flags = 0;
316 if (!udom)
317 set_bit(CACHE_NEGATIVE, &ip.h.flags);
318 ip.h.expiry_time = expiry;
319 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
320 hash_str(ipm->m_class, IP_HASHBITS) ^
321 hash_ip6(&ipm->m_addr));
322 if (!ch)
323 return -ENOMEM;
324 cache_put(ch, cd);
325 return 0;
326}
327
328void svcauth_unix_purge(struct net *net)
329{
330 struct sunrpc_net *sn;
331
332 sn = net_generic(net, sunrpc_net_id);
333 cache_purge(sn->ip_map_cache);
334}
335EXPORT_SYMBOL_GPL(svcauth_unix_purge);
336
337static inline struct ip_map *
338ip_map_cached_get(struct svc_xprt *xprt)
339{
340 struct ip_map *ipm = NULL;
341 struct sunrpc_net *sn;
342
343 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
344 spin_lock(&xprt->xpt_lock);
345 ipm = xprt->xpt_auth_cache;
346 if (ipm != NULL) {
347 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
348 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
349 /*
350 * The entry has been invalidated since it was
351 * remembered, e.g. by a second mount from the
352 * same IP address.
353 */
354 xprt->xpt_auth_cache = NULL;
355 spin_unlock(&xprt->xpt_lock);
356 cache_put(&ipm->h, sn->ip_map_cache);
357 return NULL;
358 }
359 cache_get(&ipm->h);
360 }
361 spin_unlock(&xprt->xpt_lock);
362 }
363 return ipm;
364}
365
366static inline void
367ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
368{
369 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
370 spin_lock(&xprt->xpt_lock);
371 if (xprt->xpt_auth_cache == NULL) {
372 /* newly cached, keep the reference */
373 xprt->xpt_auth_cache = ipm;
374 ipm = NULL;
375 }
376 spin_unlock(&xprt->xpt_lock);
377 }
378 if (ipm) {
379 struct sunrpc_net *sn;
380
381 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
382 cache_put(&ipm->h, sn->ip_map_cache);
383 }
384}
385
386void
387svcauth_unix_info_release(struct svc_xprt *xpt)
388{
389 struct ip_map *ipm;
390
391 ipm = xpt->xpt_auth_cache;
392 if (ipm != NULL) {
393 struct sunrpc_net *sn;
394
395 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
396 cache_put(&ipm->h, sn->ip_map_cache);
397 }
398}
399
400/****************************************************************************
401 * auth.unix.gid cache
402 * simple cache to map a UID to a list of GIDs
403 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
404 */
405#define GID_HASHBITS 8
406#define GID_HASHMAX (1<<GID_HASHBITS)
407
408struct unix_gid {
409 struct cache_head h;
410 kuid_t uid;
411 struct group_info *gi;
412 struct rcu_head rcu;
413};
414
415static int unix_gid_hash(kuid_t uid)
416{
417 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
418}
419
420static void unix_gid_free(struct rcu_head *rcu)
421{
422 struct unix_gid *ug = container_of(rcu, struct unix_gid, rcu);
423 struct cache_head *item = &ug->h;
424
425 if (test_bit(CACHE_VALID, &item->flags) &&
426 !test_bit(CACHE_NEGATIVE, &item->flags))
427 put_group_info(ug->gi);
428 kfree(ug);
429}
430
431static void unix_gid_put(struct kref *kref)
432{
433 struct cache_head *item = container_of(kref, struct cache_head, ref);
434 struct unix_gid *ug = container_of(item, struct unix_gid, h);
435
436 call_rcu(&ug->rcu, unix_gid_free);
437}
438
439static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
440{
441 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
442 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
443 return uid_eq(orig->uid, new->uid);
444}
445static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
446{
447 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
448 struct unix_gid *item = container_of(citem, struct unix_gid, h);
449 new->uid = item->uid;
450}
451static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
452{
453 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
454 struct unix_gid *item = container_of(citem, struct unix_gid, h);
455
456 get_group_info(item->gi);
457 new->gi = item->gi;
458}
459static struct cache_head *unix_gid_alloc(void)
460{
461 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
462 if (g)
463 return &g->h;
464 else
465 return NULL;
466}
467
468static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
469{
470 return sunrpc_cache_pipe_upcall_timeout(cd, h);
471}
472
473static void unix_gid_request(struct cache_detail *cd,
474 struct cache_head *h,
475 char **bpp, int *blen)
476{
477 char tuid[20];
478 struct unix_gid *ug = container_of(h, struct unix_gid, h);
479
480 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
481 qword_add(bpp, blen, tuid);
482 (*bpp)[-1] = '\n';
483}
484
485static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
486
487static int unix_gid_parse(struct cache_detail *cd,
488 char *mesg, int mlen)
489{
490 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
491 int id;
492 kuid_t uid;
493 int gids;
494 int rv;
495 int i;
496 int err;
497 time64_t expiry;
498 struct unix_gid ug, *ugp;
499
500 if (mesg[mlen - 1] != '\n')
501 return -EINVAL;
502 mesg[mlen-1] = 0;
503
504 rv = get_int(&mesg, &id);
505 if (rv)
506 return -EINVAL;
507 uid = make_kuid(current_user_ns(), id);
508 ug.uid = uid;
509
510 err = get_expiry(&mesg, &expiry);
511 if (err)
512 return err;
513
514 rv = get_int(&mesg, &gids);
515 if (rv || gids < 0 || gids > 8192)
516 return -EINVAL;
517
518 ug.gi = groups_alloc(gids);
519 if (!ug.gi)
520 return -ENOMEM;
521
522 for (i = 0 ; i < gids ; i++) {
523 int gid;
524 kgid_t kgid;
525 rv = get_int(&mesg, &gid);
526 err = -EINVAL;
527 if (rv)
528 goto out;
529 kgid = make_kgid(current_user_ns(), gid);
530 if (!gid_valid(kgid))
531 goto out;
532 ug.gi->gid[i] = kgid;
533 }
534
535 groups_sort(ug.gi);
536 ugp = unix_gid_lookup(cd, uid);
537 if (ugp) {
538 struct cache_head *ch;
539 ug.h.flags = 0;
540 ug.h.expiry_time = expiry;
541 ch = sunrpc_cache_update(cd,
542 &ug.h, &ugp->h,
543 unix_gid_hash(uid));
544 if (!ch)
545 err = -ENOMEM;
546 else {
547 err = 0;
548 cache_put(ch, cd);
549 }
550 } else
551 err = -ENOMEM;
552 out:
553 if (ug.gi)
554 put_group_info(ug.gi);
555 return err;
556}
557
558static int unix_gid_show(struct seq_file *m,
559 struct cache_detail *cd,
560 struct cache_head *h)
561{
562 struct user_namespace *user_ns = m->file->f_cred->user_ns;
563 struct unix_gid *ug;
564 int i;
565 int glen;
566
567 if (h == NULL) {
568 seq_puts(m, "#uid cnt: gids...\n");
569 return 0;
570 }
571 ug = container_of(h, struct unix_gid, h);
572 if (test_bit(CACHE_VALID, &h->flags) &&
573 !test_bit(CACHE_NEGATIVE, &h->flags))
574 glen = ug->gi->ngroups;
575 else
576 glen = 0;
577
578 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
579 for (i = 0; i < glen; i++)
580 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
581 seq_printf(m, "\n");
582 return 0;
583}
584
585static const struct cache_detail unix_gid_cache_template = {
586 .owner = THIS_MODULE,
587 .hash_size = GID_HASHMAX,
588 .name = "auth.unix.gid",
589 .cache_put = unix_gid_put,
590 .cache_upcall = unix_gid_upcall,
591 .cache_request = unix_gid_request,
592 .cache_parse = unix_gid_parse,
593 .cache_show = unix_gid_show,
594 .match = unix_gid_match,
595 .init = unix_gid_init,
596 .update = unix_gid_update,
597 .alloc = unix_gid_alloc,
598};
599
600int unix_gid_cache_create(struct net *net)
601{
602 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
603 struct cache_detail *cd;
604 int err;
605
606 cd = cache_create_net(&unix_gid_cache_template, net);
607 if (IS_ERR(cd))
608 return PTR_ERR(cd);
609 err = cache_register_net(cd, net);
610 if (err) {
611 cache_destroy_net(cd, net);
612 return err;
613 }
614 sn->unix_gid_cache = cd;
615 return 0;
616}
617
618void unix_gid_cache_destroy(struct net *net)
619{
620 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
621 struct cache_detail *cd = sn->unix_gid_cache;
622
623 sn->unix_gid_cache = NULL;
624 cache_purge(cd);
625 cache_unregister_net(cd, net);
626 cache_destroy_net(cd, net);
627}
628
629static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
630{
631 struct unix_gid ug;
632 struct cache_head *ch;
633
634 ug.uid = uid;
635 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
636 if (ch)
637 return container_of(ch, struct unix_gid, h);
638 else
639 return NULL;
640}
641
642static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
643{
644 struct unix_gid *ug;
645 struct group_info *gi;
646 int ret;
647 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
648 sunrpc_net_id);
649
650 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
651 if (!ug)
652 return ERR_PTR(-EAGAIN);
653 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
654 switch (ret) {
655 case -ENOENT:
656 return ERR_PTR(-ENOENT);
657 case -ETIMEDOUT:
658 return ERR_PTR(-ESHUTDOWN);
659 case 0:
660 gi = get_group_info(ug->gi);
661 cache_put(&ug->h, sn->unix_gid_cache);
662 return gi;
663 default:
664 return ERR_PTR(-EAGAIN);
665 }
666}
667
668enum svc_auth_status
669svcauth_unix_set_client(struct svc_rqst *rqstp)
670{
671 struct sockaddr_in *sin;
672 struct sockaddr_in6 *sin6, sin6_storage;
673 struct ip_map *ipm;
674 struct group_info *gi;
675 struct svc_cred *cred = &rqstp->rq_cred;
676 struct svc_xprt *xprt = rqstp->rq_xprt;
677 struct net *net = xprt->xpt_net;
678 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
679
680 switch (rqstp->rq_addr.ss_family) {
681 case AF_INET:
682 sin = svc_addr_in(rqstp);
683 sin6 = &sin6_storage;
684 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
685 break;
686 case AF_INET6:
687 sin6 = svc_addr_in6(rqstp);
688 break;
689 default:
690 BUG();
691 }
692
693 rqstp->rq_client = NULL;
694 if (rqstp->rq_proc == 0)
695 goto out;
696
697 rqstp->rq_auth_stat = rpc_autherr_badcred;
698 ipm = ip_map_cached_get(xprt);
699 if (ipm == NULL)
700 ipm = __ip_map_lookup(sn->ip_map_cache,
701 rqstp->rq_server->sv_programs->pg_class,
702 &sin6->sin6_addr);
703
704 if (ipm == NULL)
705 return SVC_DENIED;
706
707 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
708 default:
709 BUG();
710 case -ETIMEDOUT:
711 return SVC_CLOSE;
712 case -EAGAIN:
713 return SVC_DROP;
714 case -ENOENT:
715 return SVC_DENIED;
716 case 0:
717 rqstp->rq_client = &ipm->m_client->h;
718 kref_get(&rqstp->rq_client->ref);
719 ip_map_cached_put(xprt, ipm);
720 break;
721 }
722
723 gi = unix_gid_find(cred->cr_uid, rqstp);
724 switch (PTR_ERR(gi)) {
725 case -EAGAIN:
726 return SVC_DROP;
727 case -ESHUTDOWN:
728 return SVC_CLOSE;
729 case -ENOENT:
730 break;
731 default:
732 put_group_info(cred->cr_group_info);
733 cred->cr_group_info = gi;
734 }
735
736out:
737 rqstp->rq_auth_stat = rpc_auth_ok;
738 return SVC_OK;
739}
740EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
741
742/**
743 * svcauth_null_accept - Decode and validate incoming RPC_AUTH_NULL credential
744 * @rqstp: RPC transaction
745 *
746 * Return values:
747 * %SVC_OK: Both credential and verifier are valid
748 * %SVC_DENIED: Credential or verifier is not valid
749 * %SVC_GARBAGE: Failed to decode credential or verifier
750 * %SVC_CLOSE: Temporary failure
751 *
752 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
753 */
754static enum svc_auth_status
755svcauth_null_accept(struct svc_rqst *rqstp)
756{
757 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
758 struct svc_cred *cred = &rqstp->rq_cred;
759 u32 flavor, len;
760 void *body;
761
762 /* Length of Call's credential body field: */
763 if (xdr_stream_decode_u32(xdr, &len) < 0)
764 return SVC_GARBAGE;
765 if (len != 0) {
766 rqstp->rq_auth_stat = rpc_autherr_badcred;
767 return SVC_DENIED;
768 }
769
770 /* Call's verf field: */
771 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
772 return SVC_GARBAGE;
773 if (flavor != RPC_AUTH_NULL || len != 0) {
774 rqstp->rq_auth_stat = rpc_autherr_badverf;
775 return SVC_DENIED;
776 }
777
778 /* Signal that mapping to nobody uid/gid is required */
779 cred->cr_uid = INVALID_UID;
780 cred->cr_gid = INVALID_GID;
781 cred->cr_group_info = groups_alloc(0);
782 if (cred->cr_group_info == NULL)
783 return SVC_CLOSE; /* kmalloc failure - client must retry */
784
785 if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
786 RPC_AUTH_NULL, NULL, 0) < 0)
787 return SVC_CLOSE;
788 if (!svcxdr_set_accept_stat(rqstp))
789 return SVC_CLOSE;
790
791 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
792 return SVC_OK;
793}
794
795static int
796svcauth_null_release(struct svc_rqst *rqstp)
797{
798 if (rqstp->rq_client)
799 auth_domain_put(rqstp->rq_client);
800 rqstp->rq_client = NULL;
801 if (rqstp->rq_cred.cr_group_info)
802 put_group_info(rqstp->rq_cred.cr_group_info);
803 rqstp->rq_cred.cr_group_info = NULL;
804
805 return 0; /* don't drop */
806}
807
808
809struct auth_ops svcauth_null = {
810 .name = "null",
811 .owner = THIS_MODULE,
812 .flavour = RPC_AUTH_NULL,
813 .accept = svcauth_null_accept,
814 .release = svcauth_null_release,
815 .set_client = svcauth_unix_set_client,
816};
817
818
819/**
820 * svcauth_tls_accept - Decode and validate incoming RPC_AUTH_TLS credential
821 * @rqstp: RPC transaction
822 *
823 * Return values:
824 * %SVC_OK: Both credential and verifier are valid
825 * %SVC_DENIED: Credential or verifier is not valid
826 * %SVC_GARBAGE: Failed to decode credential or verifier
827 * %SVC_CLOSE: Temporary failure
828 *
829 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
830 */
831static enum svc_auth_status
832svcauth_tls_accept(struct svc_rqst *rqstp)
833{
834 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
835 struct svc_cred *cred = &rqstp->rq_cred;
836 struct svc_xprt *xprt = rqstp->rq_xprt;
837 u32 flavor, len;
838 void *body;
839 __be32 *p;
840
841 /* Length of Call's credential body field: */
842 if (xdr_stream_decode_u32(xdr, &len) < 0)
843 return SVC_GARBAGE;
844 if (len != 0) {
845 rqstp->rq_auth_stat = rpc_autherr_badcred;
846 return SVC_DENIED;
847 }
848
849 /* Call's verf field: */
850 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
851 return SVC_GARBAGE;
852 if (flavor != RPC_AUTH_NULL || len != 0) {
853 rqstp->rq_auth_stat = rpc_autherr_badverf;
854 return SVC_DENIED;
855 }
856
857 /* AUTH_TLS is not valid on non-NULL procedures */
858 if (rqstp->rq_proc != 0) {
859 rqstp->rq_auth_stat = rpc_autherr_badcred;
860 return SVC_DENIED;
861 }
862
863 /* Signal that mapping to nobody uid/gid is required */
864 cred->cr_uid = INVALID_UID;
865 cred->cr_gid = INVALID_GID;
866 cred->cr_group_info = groups_alloc(0);
867 if (cred->cr_group_info == NULL)
868 return SVC_CLOSE;
869
870 if (xprt->xpt_ops->xpo_handshake) {
871 p = xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2 + 8);
872 if (!p)
873 return SVC_CLOSE;
874 trace_svc_tls_start(xprt);
875 *p++ = rpc_auth_null;
876 *p++ = cpu_to_be32(8);
877 memcpy(p, "STARTTLS", 8);
878
879 set_bit(XPT_HANDSHAKE, &xprt->xpt_flags);
880 svc_xprt_enqueue(xprt);
881 } else {
882 trace_svc_tls_unavailable(xprt);
883 if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
884 RPC_AUTH_NULL, NULL, 0) < 0)
885 return SVC_CLOSE;
886 }
887 if (!svcxdr_set_accept_stat(rqstp))
888 return SVC_CLOSE;
889
890 rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
891 return SVC_OK;
892}
893
894struct auth_ops svcauth_tls = {
895 .name = "tls",
896 .owner = THIS_MODULE,
897 .flavour = RPC_AUTH_TLS,
898 .accept = svcauth_tls_accept,
899 .release = svcauth_null_release,
900 .set_client = svcauth_unix_set_client,
901};
902
903
904/**
905 * svcauth_unix_accept - Decode and validate incoming RPC_AUTH_SYS credential
906 * @rqstp: RPC transaction
907 *
908 * Return values:
909 * %SVC_OK: Both credential and verifier are valid
910 * %SVC_DENIED: Credential or verifier is not valid
911 * %SVC_GARBAGE: Failed to decode credential or verifier
912 * %SVC_CLOSE: Temporary failure
913 *
914 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
915 */
916static enum svc_auth_status
917svcauth_unix_accept(struct svc_rqst *rqstp)
918{
919 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
920 struct svc_cred *cred = &rqstp->rq_cred;
921 struct user_namespace *userns;
922 u32 flavor, len, i;
923 void *body;
924 __be32 *p;
925
926 /*
927 * This implementation ignores the length of the Call's
928 * credential body field and the timestamp and machinename
929 * fields.
930 */
931 p = xdr_inline_decode(xdr, XDR_UNIT * 3);
932 if (!p)
933 return SVC_GARBAGE;
934 len = be32_to_cpup(p + 2);
935 if (len > RPC_MAX_MACHINENAME)
936 return SVC_GARBAGE;
937 if (!xdr_inline_decode(xdr, len))
938 return SVC_GARBAGE;
939
940 /*
941 * Note: we skip uid_valid()/gid_valid() checks here for
942 * backwards compatibility with clients that use -1 id's.
943 * Instead, -1 uid or gid is later mapped to the
944 * (export-specific) anonymous id by nfsd_setuser.
945 * Supplementary gid's will be left alone.
946 */
947 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
948 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
949 if (xdr_stream_decode_u32(xdr, &i) < 0)
950 return SVC_GARBAGE;
951 cred->cr_uid = make_kuid(userns, i);
952 if (xdr_stream_decode_u32(xdr, &i) < 0)
953 return SVC_GARBAGE;
954 cred->cr_gid = make_kgid(userns, i);
955
956 if (xdr_stream_decode_u32(xdr, &len) < 0)
957 return SVC_GARBAGE;
958 if (len > UNX_NGROUPS)
959 goto badcred;
960 p = xdr_inline_decode(xdr, XDR_UNIT * len);
961 if (!p)
962 return SVC_GARBAGE;
963 cred->cr_group_info = groups_alloc(len);
964 if (cred->cr_group_info == NULL)
965 return SVC_CLOSE;
966 for (i = 0; i < len; i++) {
967 kgid_t kgid = make_kgid(userns, be32_to_cpup(p++));
968 cred->cr_group_info->gid[i] = kgid;
969 }
970 groups_sort(cred->cr_group_info);
971
972 /* Call's verf field: */
973 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
974 return SVC_GARBAGE;
975 if (flavor != RPC_AUTH_NULL || len != 0) {
976 rqstp->rq_auth_stat = rpc_autherr_badverf;
977 return SVC_DENIED;
978 }
979
980 if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
981 RPC_AUTH_NULL, NULL, 0) < 0)
982 return SVC_CLOSE;
983 if (!svcxdr_set_accept_stat(rqstp))
984 return SVC_CLOSE;
985
986 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
987 return SVC_OK;
988
989badcred:
990 rqstp->rq_auth_stat = rpc_autherr_badcred;
991 return SVC_DENIED;
992}
993
994static int
995svcauth_unix_release(struct svc_rqst *rqstp)
996{
997 /* Verifier (such as it is) is already in place.
998 */
999 if (rqstp->rq_client)
1000 auth_domain_put(rqstp->rq_client);
1001 rqstp->rq_client = NULL;
1002 if (rqstp->rq_cred.cr_group_info)
1003 put_group_info(rqstp->rq_cred.cr_group_info);
1004 rqstp->rq_cred.cr_group_info = NULL;
1005
1006 return 0;
1007}
1008
1009
1010struct auth_ops svcauth_unix = {
1011 .name = "unix",
1012 .owner = THIS_MODULE,
1013 .flavour = RPC_AUTH_UNIX,
1014 .accept = svcauth_unix_accept,
1015 .release = svcauth_unix_release,
1016 .domain_release = svcauth_unix_domain_release,
1017 .set_client = svcauth_unix_set_client,
1018};
1019
1020static const struct cache_detail ip_map_cache_template = {
1021 .owner = THIS_MODULE,
1022 .hash_size = IP_HASHMAX,
1023 .name = "auth.unix.ip",
1024 .cache_put = ip_map_put,
1025 .cache_upcall = ip_map_upcall,
1026 .cache_request = ip_map_request,
1027 .cache_parse = ip_map_parse,
1028 .cache_show = ip_map_show,
1029 .match = ip_map_match,
1030 .init = ip_map_init,
1031 .update = update,
1032 .alloc = ip_map_alloc,
1033};
1034
1035int ip_map_cache_create(struct net *net)
1036{
1037 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1038 struct cache_detail *cd;
1039 int err;
1040
1041 cd = cache_create_net(&ip_map_cache_template, net);
1042 if (IS_ERR(cd))
1043 return PTR_ERR(cd);
1044 err = cache_register_net(cd, net);
1045 if (err) {
1046 cache_destroy_net(cd, net);
1047 return err;
1048 }
1049 sn->ip_map_cache = cd;
1050 return 0;
1051}
1052
1053void ip_map_cache_destroy(struct net *net)
1054{
1055 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1056 struct cache_detail *cd = sn->ip_map_cache;
1057
1058 sn->ip_map_cache = NULL;
1059 cache_purge(cd);
1060 cache_unregister_net(cd, net);
1061 cache_destroy_net(cd, net);
1062}