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