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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/types.h>
3#include <linux/sched.h>
4#include <linux/module.h>
5#include <linux/sunrpc/types.h>
6#include <linux/sunrpc/xdr.h>
7#include <linux/sunrpc/svcsock.h>
8#include <linux/sunrpc/svcauth.h>
9#include <linux/sunrpc/gss_api.h>
10#include <linux/sunrpc/addr.h>
11#include <linux/err.h>
12#include <linux/seq_file.h>
13#include <linux/hash.h>
14#include <linux/string.h>
15#include <linux/slab.h>
16#include <net/sock.h>
17#include <net/ipv6.h>
18#include <linux/kernel.h>
19#include <linux/user_namespace.h>
20#define RPCDBG_FACILITY RPCDBG_AUTH
21
22
23#include "netns.h"
24
25/*
26 * AUTHUNIX and AUTHNULL credentials are both handled here.
27 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
28 * are always nobody (-2). i.e. we do the same IP address checks for
29 * AUTHNULL as for AUTHUNIX, and that is done here.
30 */
31
32
33struct unix_domain {
34 struct auth_domain h;
35 /* other stuff later */
36};
37
38extern struct auth_ops svcauth_null;
39extern struct auth_ops svcauth_unix;
40extern struct auth_ops svcauth_tls;
41
42static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
43{
44 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
45 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
46
47 kfree(dom->name);
48 kfree(ud);
49}
50
51static void svcauth_unix_domain_release(struct auth_domain *dom)
52{
53 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
54}
55
56struct auth_domain *unix_domain_find(char *name)
57{
58 struct auth_domain *rv;
59 struct unix_domain *new = NULL;
60
61 rv = auth_domain_find(name);
62 while(1) {
63 if (rv) {
64 if (new && rv != &new->h)
65 svcauth_unix_domain_release(&new->h);
66
67 if (rv->flavour != &svcauth_unix) {
68 auth_domain_put(rv);
69 return NULL;
70 }
71 return rv;
72 }
73
74 new = kmalloc(sizeof(*new), GFP_KERNEL);
75 if (new == NULL)
76 return NULL;
77 kref_init(&new->h.ref);
78 new->h.name = kstrdup(name, GFP_KERNEL);
79 if (new->h.name == NULL) {
80 kfree(new);
81 return NULL;
82 }
83 new->h.flavour = &svcauth_unix;
84 rv = auth_domain_lookup(name, &new->h);
85 }
86}
87EXPORT_SYMBOL_GPL(unix_domain_find);
88
89
90/**************************************************
91 * cache for IP address to unix_domain
92 * as needed by AUTH_UNIX
93 */
94#define IP_HASHBITS 8
95#define IP_HASHMAX (1<<IP_HASHBITS)
96
97struct ip_map {
98 struct cache_head h;
99 char m_class[8]; /* e.g. "nfsd" */
100 struct in6_addr m_addr;
101 struct unix_domain *m_client;
102 struct rcu_head m_rcu;
103};
104
105static void ip_map_put(struct kref *kref)
106{
107 struct cache_head *item = container_of(kref, struct cache_head, ref);
108 struct ip_map *im = container_of(item, struct ip_map,h);
109
110 if (test_bit(CACHE_VALID, &item->flags) &&
111 !test_bit(CACHE_NEGATIVE, &item->flags))
112 auth_domain_put(&im->m_client->h);
113 kfree_rcu(im, m_rcu);
114}
115
116static inline int hash_ip6(const struct in6_addr *ip)
117{
118 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
119}
120static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
121{
122 struct ip_map *orig = container_of(corig, struct ip_map, h);
123 struct ip_map *new = container_of(cnew, struct ip_map, h);
124 return strcmp(orig->m_class, new->m_class) == 0 &&
125 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
126}
127static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
128{
129 struct ip_map *new = container_of(cnew, struct ip_map, h);
130 struct ip_map *item = container_of(citem, struct ip_map, h);
131
132 strcpy(new->m_class, item->m_class);
133 new->m_addr = item->m_addr;
134}
135static void update(struct cache_head *cnew, struct cache_head *citem)
136{
137 struct ip_map *new = container_of(cnew, struct ip_map, h);
138 struct ip_map *item = container_of(citem, struct ip_map, h);
139
140 kref_get(&item->m_client->h.ref);
141 new->m_client = item->m_client;
142}
143static struct cache_head *ip_map_alloc(void)
144{
145 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
146 if (i)
147 return &i->h;
148 else
149 return NULL;
150}
151
152static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
153{
154 return sunrpc_cache_pipe_upcall(cd, h);
155}
156
157static void ip_map_request(struct cache_detail *cd,
158 struct cache_head *h,
159 char **bpp, int *blen)
160{
161 char text_addr[40];
162 struct ip_map *im = container_of(h, struct ip_map, h);
163
164 if (ipv6_addr_v4mapped(&(im->m_addr))) {
165 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
166 } else {
167 snprintf(text_addr, 40, "%pI6", &im->m_addr);
168 }
169 qword_add(bpp, blen, im->m_class);
170 qword_add(bpp, blen, text_addr);
171 (*bpp)[-1] = '\n';
172}
173
174static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
175static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
176
177static int ip_map_parse(struct cache_detail *cd,
178 char *mesg, int mlen)
179{
180 /* class ipaddress [domainname] */
181 /* should be safe just to use the start of the input buffer
182 * for scratch: */
183 char *buf = mesg;
184 int len;
185 char class[8];
186 union {
187 struct sockaddr sa;
188 struct sockaddr_in s4;
189 struct sockaddr_in6 s6;
190 } address;
191 struct sockaddr_in6 sin6;
192 int err;
193
194 struct ip_map *ipmp;
195 struct auth_domain *dom;
196 time64_t expiry;
197
198 if (mesg[mlen-1] != '\n')
199 return -EINVAL;
200 mesg[mlen-1] = 0;
201
202 /* class */
203 len = qword_get(&mesg, class, sizeof(class));
204 if (len <= 0) return -EINVAL;
205
206 /* ip address */
207 len = qword_get(&mesg, buf, mlen);
208 if (len <= 0) return -EINVAL;
209
210 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
211 return -EINVAL;
212 switch (address.sa.sa_family) {
213 case AF_INET:
214 /* Form a mapped IPv4 address in sin6 */
215 sin6.sin6_family = AF_INET6;
216 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
217 &sin6.sin6_addr);
218 break;
219#if IS_ENABLED(CONFIG_IPV6)
220 case AF_INET6:
221 memcpy(&sin6, &address.s6, sizeof(sin6));
222 break;
223#endif
224 default:
225 return -EINVAL;
226 }
227
228 expiry = get_expiry(&mesg);
229 if (expiry ==0)
230 return -EINVAL;
231
232 /* domainname, or empty for NEGATIVE */
233 len = qword_get(&mesg, buf, mlen);
234 if (len < 0) return -EINVAL;
235
236 if (len) {
237 dom = unix_domain_find(buf);
238 if (dom == NULL)
239 return -ENOENT;
240 } else
241 dom = NULL;
242
243 /* IPv6 scope IDs are ignored for now */
244 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
245 if (ipmp) {
246 err = __ip_map_update(cd, ipmp,
247 container_of(dom, struct unix_domain, h),
248 expiry);
249 } else
250 err = -ENOMEM;
251
252 if (dom)
253 auth_domain_put(dom);
254
255 cache_flush();
256 return err;
257}
258
259static int ip_map_show(struct seq_file *m,
260 struct cache_detail *cd,
261 struct cache_head *h)
262{
263 struct ip_map *im;
264 struct in6_addr addr;
265 char *dom = "-no-domain-";
266
267 if (h == NULL) {
268 seq_puts(m, "#class IP domain\n");
269 return 0;
270 }
271 im = container_of(h, struct ip_map, h);
272 /* class addr domain */
273 addr = im->m_addr;
274
275 if (test_bit(CACHE_VALID, &h->flags) &&
276 !test_bit(CACHE_NEGATIVE, &h->flags))
277 dom = im->m_client->h.name;
278
279 if (ipv6_addr_v4mapped(&addr)) {
280 seq_printf(m, "%s %pI4 %s\n",
281 im->m_class, &addr.s6_addr32[3], dom);
282 } else {
283 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
284 }
285 return 0;
286}
287
288
289static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
290 struct in6_addr *addr)
291{
292 struct ip_map ip;
293 struct cache_head *ch;
294
295 strcpy(ip.m_class, class);
296 ip.m_addr = *addr;
297 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
298 hash_str(class, IP_HASHBITS) ^
299 hash_ip6(addr));
300
301 if (ch)
302 return container_of(ch, struct ip_map, h);
303 else
304 return NULL;
305}
306
307static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
308 struct unix_domain *udom, time64_t expiry)
309{
310 struct ip_map ip;
311 struct cache_head *ch;
312
313 ip.m_client = udom;
314 ip.h.flags = 0;
315 if (!udom)
316 set_bit(CACHE_NEGATIVE, &ip.h.flags);
317 ip.h.expiry_time = expiry;
318 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
319 hash_str(ipm->m_class, IP_HASHBITS) ^
320 hash_ip6(&ipm->m_addr));
321 if (!ch)
322 return -ENOMEM;
323 cache_put(ch, cd);
324 return 0;
325}
326
327void svcauth_unix_purge(struct net *net)
328{
329 struct sunrpc_net *sn;
330
331 sn = net_generic(net, sunrpc_net_id);
332 cache_purge(sn->ip_map_cache);
333}
334EXPORT_SYMBOL_GPL(svcauth_unix_purge);
335
336static inline struct ip_map *
337ip_map_cached_get(struct svc_xprt *xprt)
338{
339 struct ip_map *ipm = NULL;
340 struct sunrpc_net *sn;
341
342 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
343 spin_lock(&xprt->xpt_lock);
344 ipm = xprt->xpt_auth_cache;
345 if (ipm != NULL) {
346 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
347 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
348 /*
349 * The entry has been invalidated since it was
350 * remembered, e.g. by a second mount from the
351 * same IP address.
352 */
353 xprt->xpt_auth_cache = NULL;
354 spin_unlock(&xprt->xpt_lock);
355 cache_put(&ipm->h, sn->ip_map_cache);
356 return NULL;
357 }
358 cache_get(&ipm->h);
359 }
360 spin_unlock(&xprt->xpt_lock);
361 }
362 return ipm;
363}
364
365static inline void
366ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
367{
368 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
369 spin_lock(&xprt->xpt_lock);
370 if (xprt->xpt_auth_cache == NULL) {
371 /* newly cached, keep the reference */
372 xprt->xpt_auth_cache = ipm;
373 ipm = NULL;
374 }
375 spin_unlock(&xprt->xpt_lock);
376 }
377 if (ipm) {
378 struct sunrpc_net *sn;
379
380 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
381 cache_put(&ipm->h, sn->ip_map_cache);
382 }
383}
384
385void
386svcauth_unix_info_release(struct svc_xprt *xpt)
387{
388 struct ip_map *ipm;
389
390 ipm = xpt->xpt_auth_cache;
391 if (ipm != NULL) {
392 struct sunrpc_net *sn;
393
394 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
395 cache_put(&ipm->h, sn->ip_map_cache);
396 }
397}
398
399/****************************************************************************
400 * auth.unix.gid cache
401 * simple cache to map a UID to a list of GIDs
402 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
403 */
404#define GID_HASHBITS 8
405#define GID_HASHMAX (1<<GID_HASHBITS)
406
407struct unix_gid {
408 struct cache_head h;
409 kuid_t uid;
410 struct group_info *gi;
411 struct rcu_head rcu;
412};
413
414static int unix_gid_hash(kuid_t uid)
415{
416 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
417}
418
419static void unix_gid_put(struct kref *kref)
420{
421 struct cache_head *item = container_of(kref, struct cache_head, ref);
422 struct unix_gid *ug = container_of(item, struct unix_gid, h);
423 if (test_bit(CACHE_VALID, &item->flags) &&
424 !test_bit(CACHE_NEGATIVE, &item->flags))
425 put_group_info(ug->gi);
426 kfree_rcu(ug, rcu);
427}
428
429static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
430{
431 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
432 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
433 return uid_eq(orig->uid, new->uid);
434}
435static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
436{
437 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
438 struct unix_gid *item = container_of(citem, struct unix_gid, h);
439 new->uid = item->uid;
440}
441static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
442{
443 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
444 struct unix_gid *item = container_of(citem, struct unix_gid, h);
445
446 get_group_info(item->gi);
447 new->gi = item->gi;
448}
449static struct cache_head *unix_gid_alloc(void)
450{
451 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
452 if (g)
453 return &g->h;
454 else
455 return NULL;
456}
457
458static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
459{
460 return sunrpc_cache_pipe_upcall_timeout(cd, h);
461}
462
463static void unix_gid_request(struct cache_detail *cd,
464 struct cache_head *h,
465 char **bpp, int *blen)
466{
467 char tuid[20];
468 struct unix_gid *ug = container_of(h, struct unix_gid, h);
469
470 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
471 qword_add(bpp, blen, tuid);
472 (*bpp)[-1] = '\n';
473}
474
475static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
476
477static int unix_gid_parse(struct cache_detail *cd,
478 char *mesg, int mlen)
479{
480 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
481 int id;
482 kuid_t uid;
483 int gids;
484 int rv;
485 int i;
486 int err;
487 time64_t expiry;
488 struct unix_gid ug, *ugp;
489
490 if (mesg[mlen - 1] != '\n')
491 return -EINVAL;
492 mesg[mlen-1] = 0;
493
494 rv = get_int(&mesg, &id);
495 if (rv)
496 return -EINVAL;
497 uid = make_kuid(current_user_ns(), id);
498 ug.uid = uid;
499
500 expiry = get_expiry(&mesg);
501 if (expiry == 0)
502 return -EINVAL;
503
504 rv = get_int(&mesg, &gids);
505 if (rv || gids < 0 || gids > 8192)
506 return -EINVAL;
507
508 ug.gi = groups_alloc(gids);
509 if (!ug.gi)
510 return -ENOMEM;
511
512 for (i = 0 ; i < gids ; i++) {
513 int gid;
514 kgid_t kgid;
515 rv = get_int(&mesg, &gid);
516 err = -EINVAL;
517 if (rv)
518 goto out;
519 kgid = make_kgid(current_user_ns(), gid);
520 if (!gid_valid(kgid))
521 goto out;
522 ug.gi->gid[i] = kgid;
523 }
524
525 groups_sort(ug.gi);
526 ugp = unix_gid_lookup(cd, uid);
527 if (ugp) {
528 struct cache_head *ch;
529 ug.h.flags = 0;
530 ug.h.expiry_time = expiry;
531 ch = sunrpc_cache_update(cd,
532 &ug.h, &ugp->h,
533 unix_gid_hash(uid));
534 if (!ch)
535 err = -ENOMEM;
536 else {
537 err = 0;
538 cache_put(ch, cd);
539 }
540 } else
541 err = -ENOMEM;
542 out:
543 if (ug.gi)
544 put_group_info(ug.gi);
545 return err;
546}
547
548static int unix_gid_show(struct seq_file *m,
549 struct cache_detail *cd,
550 struct cache_head *h)
551{
552 struct user_namespace *user_ns = m->file->f_cred->user_ns;
553 struct unix_gid *ug;
554 int i;
555 int glen;
556
557 if (h == NULL) {
558 seq_puts(m, "#uid cnt: gids...\n");
559 return 0;
560 }
561 ug = container_of(h, struct unix_gid, h);
562 if (test_bit(CACHE_VALID, &h->flags) &&
563 !test_bit(CACHE_NEGATIVE, &h->flags))
564 glen = ug->gi->ngroups;
565 else
566 glen = 0;
567
568 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
569 for (i = 0; i < glen; i++)
570 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
571 seq_printf(m, "\n");
572 return 0;
573}
574
575static const struct cache_detail unix_gid_cache_template = {
576 .owner = THIS_MODULE,
577 .hash_size = GID_HASHMAX,
578 .name = "auth.unix.gid",
579 .cache_put = unix_gid_put,
580 .cache_upcall = unix_gid_upcall,
581 .cache_request = unix_gid_request,
582 .cache_parse = unix_gid_parse,
583 .cache_show = unix_gid_show,
584 .match = unix_gid_match,
585 .init = unix_gid_init,
586 .update = unix_gid_update,
587 .alloc = unix_gid_alloc,
588};
589
590int unix_gid_cache_create(struct net *net)
591{
592 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
593 struct cache_detail *cd;
594 int err;
595
596 cd = cache_create_net(&unix_gid_cache_template, net);
597 if (IS_ERR(cd))
598 return PTR_ERR(cd);
599 err = cache_register_net(cd, net);
600 if (err) {
601 cache_destroy_net(cd, net);
602 return err;
603 }
604 sn->unix_gid_cache = cd;
605 return 0;
606}
607
608void unix_gid_cache_destroy(struct net *net)
609{
610 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
611 struct cache_detail *cd = sn->unix_gid_cache;
612
613 sn->unix_gid_cache = NULL;
614 cache_purge(cd);
615 cache_unregister_net(cd, net);
616 cache_destroy_net(cd, net);
617}
618
619static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
620{
621 struct unix_gid ug;
622 struct cache_head *ch;
623
624 ug.uid = uid;
625 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
626 if (ch)
627 return container_of(ch, struct unix_gid, h);
628 else
629 return NULL;
630}
631
632static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
633{
634 struct unix_gid *ug;
635 struct group_info *gi;
636 int ret;
637 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
638 sunrpc_net_id);
639
640 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
641 if (!ug)
642 return ERR_PTR(-EAGAIN);
643 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
644 switch (ret) {
645 case -ENOENT:
646 return ERR_PTR(-ENOENT);
647 case -ETIMEDOUT:
648 return ERR_PTR(-ESHUTDOWN);
649 case 0:
650 gi = get_group_info(ug->gi);
651 cache_put(&ug->h, sn->unix_gid_cache);
652 return gi;
653 default:
654 return ERR_PTR(-EAGAIN);
655 }
656}
657
658int
659svcauth_unix_set_client(struct svc_rqst *rqstp)
660{
661 struct sockaddr_in *sin;
662 struct sockaddr_in6 *sin6, sin6_storage;
663 struct ip_map *ipm;
664 struct group_info *gi;
665 struct svc_cred *cred = &rqstp->rq_cred;
666 struct svc_xprt *xprt = rqstp->rq_xprt;
667 struct net *net = xprt->xpt_net;
668 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
669
670 switch (rqstp->rq_addr.ss_family) {
671 case AF_INET:
672 sin = svc_addr_in(rqstp);
673 sin6 = &sin6_storage;
674 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
675 break;
676 case AF_INET6:
677 sin6 = svc_addr_in6(rqstp);
678 break;
679 default:
680 BUG();
681 }
682
683 rqstp->rq_client = NULL;
684 if (rqstp->rq_proc == 0)
685 goto out;
686
687 rqstp->rq_auth_stat = rpc_autherr_badcred;
688 ipm = ip_map_cached_get(xprt);
689 if (ipm == NULL)
690 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
691 &sin6->sin6_addr);
692
693 if (ipm == NULL)
694 return SVC_DENIED;
695
696 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
697 default:
698 BUG();
699 case -ETIMEDOUT:
700 return SVC_CLOSE;
701 case -EAGAIN:
702 return SVC_DROP;
703 case -ENOENT:
704 return SVC_DENIED;
705 case 0:
706 rqstp->rq_client = &ipm->m_client->h;
707 kref_get(&rqstp->rq_client->ref);
708 ip_map_cached_put(xprt, ipm);
709 break;
710 }
711
712 gi = unix_gid_find(cred->cr_uid, rqstp);
713 switch (PTR_ERR(gi)) {
714 case -EAGAIN:
715 return SVC_DROP;
716 case -ESHUTDOWN:
717 return SVC_CLOSE;
718 case -ENOENT:
719 break;
720 default:
721 put_group_info(cred->cr_group_info);
722 cred->cr_group_info = gi;
723 }
724
725out:
726 rqstp->rq_auth_stat = rpc_auth_ok;
727 return SVC_OK;
728}
729
730EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
731
732static int
733svcauth_null_accept(struct svc_rqst *rqstp)
734{
735 struct kvec *argv = &rqstp->rq_arg.head[0];
736 struct kvec *resv = &rqstp->rq_res.head[0];
737 struct svc_cred *cred = &rqstp->rq_cred;
738
739 if (argv->iov_len < 3*4)
740 return SVC_GARBAGE;
741
742 if (svc_getu32(argv) != 0) {
743 dprintk("svc: bad null cred\n");
744 rqstp->rq_auth_stat = rpc_autherr_badcred;
745 return SVC_DENIED;
746 }
747 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
748 dprintk("svc: bad null verf\n");
749 rqstp->rq_auth_stat = rpc_autherr_badverf;
750 return SVC_DENIED;
751 }
752
753 /* Signal that mapping to nobody uid/gid is required */
754 cred->cr_uid = INVALID_UID;
755 cred->cr_gid = INVALID_GID;
756 cred->cr_group_info = groups_alloc(0);
757 if (cred->cr_group_info == NULL)
758 return SVC_CLOSE; /* kmalloc failure - client must retry */
759
760 /* Put NULL verifier */
761 svc_putnl(resv, RPC_AUTH_NULL);
762 svc_putnl(resv, 0);
763
764 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
765 return SVC_OK;
766}
767
768static int
769svcauth_null_release(struct svc_rqst *rqstp)
770{
771 if (rqstp->rq_client)
772 auth_domain_put(rqstp->rq_client);
773 rqstp->rq_client = NULL;
774 if (rqstp->rq_cred.cr_group_info)
775 put_group_info(rqstp->rq_cred.cr_group_info);
776 rqstp->rq_cred.cr_group_info = NULL;
777
778 return 0; /* don't drop */
779}
780
781
782struct auth_ops svcauth_null = {
783 .name = "null",
784 .owner = THIS_MODULE,
785 .flavour = RPC_AUTH_NULL,
786 .accept = svcauth_null_accept,
787 .release = svcauth_null_release,
788 .set_client = svcauth_unix_set_client,
789};
790
791
792static int
793svcauth_tls_accept(struct svc_rqst *rqstp)
794{
795 struct svc_cred *cred = &rqstp->rq_cred;
796 struct kvec *argv = rqstp->rq_arg.head;
797 struct kvec *resv = rqstp->rq_res.head;
798
799 if (argv->iov_len < XDR_UNIT * 3)
800 return SVC_GARBAGE;
801
802 /* Call's cred length */
803 if (svc_getu32(argv) != xdr_zero) {
804 rqstp->rq_auth_stat = rpc_autherr_badcred;
805 return SVC_DENIED;
806 }
807
808 /* Call's verifier flavor and its length */
809 if (svc_getu32(argv) != rpc_auth_null ||
810 svc_getu32(argv) != xdr_zero) {
811 rqstp->rq_auth_stat = rpc_autherr_badverf;
812 return SVC_DENIED;
813 }
814
815 /* AUTH_TLS is not valid on non-NULL procedures */
816 if (rqstp->rq_proc != 0) {
817 rqstp->rq_auth_stat = rpc_autherr_badcred;
818 return SVC_DENIED;
819 }
820
821 /* Mapping to nobody uid/gid is required */
822 cred->cr_uid = INVALID_UID;
823 cred->cr_gid = INVALID_GID;
824 cred->cr_group_info = groups_alloc(0);
825 if (cred->cr_group_info == NULL)
826 return SVC_CLOSE; /* kmalloc failure - client must retry */
827
828 /* Reply's verifier */
829 svc_putnl(resv, RPC_AUTH_NULL);
830 if (rqstp->rq_xprt->xpt_ops->xpo_start_tls) {
831 svc_putnl(resv, 8);
832 memcpy(resv->iov_base + resv->iov_len, "STARTTLS", 8);
833 resv->iov_len += 8;
834 } else
835 svc_putnl(resv, 0);
836
837 rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
838 return SVC_OK;
839}
840
841struct auth_ops svcauth_tls = {
842 .name = "tls",
843 .owner = THIS_MODULE,
844 .flavour = RPC_AUTH_TLS,
845 .accept = svcauth_tls_accept,
846 .release = svcauth_null_release,
847 .set_client = svcauth_unix_set_client,
848};
849
850
851static int
852svcauth_unix_accept(struct svc_rqst *rqstp)
853{
854 struct kvec *argv = &rqstp->rq_arg.head[0];
855 struct kvec *resv = &rqstp->rq_res.head[0];
856 struct svc_cred *cred = &rqstp->rq_cred;
857 struct user_namespace *userns;
858 u32 slen, i;
859 int len = argv->iov_len;
860
861 if ((len -= 3*4) < 0)
862 return SVC_GARBAGE;
863
864 svc_getu32(argv); /* length */
865 svc_getu32(argv); /* time stamp */
866 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
867 if (slen > 64 || (len -= (slen + 3)*4) < 0)
868 goto badcred;
869 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
870 argv->iov_len -= slen*4;
871 /*
872 * Note: we skip uid_valid()/gid_valid() checks here for
873 * backwards compatibility with clients that use -1 id's.
874 * Instead, -1 uid or gid is later mapped to the
875 * (export-specific) anonymous id by nfsd_setuser.
876 * Supplementary gid's will be left alone.
877 */
878 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
879 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
880 cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
881 cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
882 slen = svc_getnl(argv); /* gids length */
883 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
884 goto badcred;
885 cred->cr_group_info = groups_alloc(slen);
886 if (cred->cr_group_info == NULL)
887 return SVC_CLOSE;
888 for (i = 0; i < slen; i++) {
889 kgid_t kgid = make_kgid(userns, svc_getnl(argv));
890 cred->cr_group_info->gid[i] = kgid;
891 }
892 groups_sort(cred->cr_group_info);
893 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
894 rqstp->rq_auth_stat = rpc_autherr_badverf;
895 return SVC_DENIED;
896 }
897
898 /* Put NULL verifier */
899 svc_putnl(resv, RPC_AUTH_NULL);
900 svc_putnl(resv, 0);
901
902 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
903 return SVC_OK;
904
905badcred:
906 rqstp->rq_auth_stat = rpc_autherr_badcred;
907 return SVC_DENIED;
908}
909
910static int
911svcauth_unix_release(struct svc_rqst *rqstp)
912{
913 /* Verifier (such as it is) is already in place.
914 */
915 if (rqstp->rq_client)
916 auth_domain_put(rqstp->rq_client);
917 rqstp->rq_client = NULL;
918 if (rqstp->rq_cred.cr_group_info)
919 put_group_info(rqstp->rq_cred.cr_group_info);
920 rqstp->rq_cred.cr_group_info = NULL;
921
922 return 0;
923}
924
925
926struct auth_ops svcauth_unix = {
927 .name = "unix",
928 .owner = THIS_MODULE,
929 .flavour = RPC_AUTH_UNIX,
930 .accept = svcauth_unix_accept,
931 .release = svcauth_unix_release,
932 .domain_release = svcauth_unix_domain_release,
933 .set_client = svcauth_unix_set_client,
934};
935
936static const struct cache_detail ip_map_cache_template = {
937 .owner = THIS_MODULE,
938 .hash_size = IP_HASHMAX,
939 .name = "auth.unix.ip",
940 .cache_put = ip_map_put,
941 .cache_upcall = ip_map_upcall,
942 .cache_request = ip_map_request,
943 .cache_parse = ip_map_parse,
944 .cache_show = ip_map_show,
945 .match = ip_map_match,
946 .init = ip_map_init,
947 .update = update,
948 .alloc = ip_map_alloc,
949};
950
951int ip_map_cache_create(struct net *net)
952{
953 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
954 struct cache_detail *cd;
955 int err;
956
957 cd = cache_create_net(&ip_map_cache_template, net);
958 if (IS_ERR(cd))
959 return PTR_ERR(cd);
960 err = cache_register_net(cd, net);
961 if (err) {
962 cache_destroy_net(cd, net);
963 return err;
964 }
965 sn->ip_map_cache = cd;
966 return 0;
967}
968
969void ip_map_cache_destroy(struct net *net)
970{
971 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
972 struct cache_detail *cd = sn->ip_map_cache;
973
974 sn->ip_map_cache = NULL;
975 cache_purge(cd);
976 cache_unregister_net(cd, net);
977 cache_destroy_net(cd, net);
978}
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 UNX_NGROUPS
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 ug.gi->gid[i] = kgid;
521 }
522
523 groups_sort(ug.gi);
524 ugp = unix_gid_lookup(cd, uid);
525 if (ugp) {
526 struct cache_head *ch;
527 ug.h.flags = 0;
528 ug.h.expiry_time = expiry;
529 ch = sunrpc_cache_update(cd,
530 &ug.h, &ugp->h,
531 unix_gid_hash(uid));
532 if (!ch)
533 err = -ENOMEM;
534 else {
535 err = 0;
536 cache_put(ch, cd);
537 }
538 } else
539 err = -ENOMEM;
540 out:
541 if (ug.gi)
542 put_group_info(ug.gi);
543 return err;
544}
545
546static int unix_gid_show(struct seq_file *m,
547 struct cache_detail *cd,
548 struct cache_head *h)
549{
550 struct user_namespace *user_ns = &init_user_ns;
551 struct unix_gid *ug;
552 int i;
553 int glen;
554
555 if (h == NULL) {
556 seq_puts(m, "#uid cnt: gids...\n");
557 return 0;
558 }
559 ug = container_of(h, struct unix_gid, h);
560 if (test_bit(CACHE_VALID, &h->flags) &&
561 !test_bit(CACHE_NEGATIVE, &h->flags))
562 glen = ug->gi->ngroups;
563 else
564 glen = 0;
565
566 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
567 for (i = 0; i < glen; i++)
568 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
569 seq_printf(m, "\n");
570 return 0;
571}
572
573static const struct cache_detail unix_gid_cache_template = {
574 .owner = THIS_MODULE,
575 .hash_size = GID_HASHMAX,
576 .name = "auth.unix.gid",
577 .cache_put = unix_gid_put,
578 .cache_request = unix_gid_request,
579 .cache_parse = unix_gid_parse,
580 .cache_show = unix_gid_show,
581 .match = unix_gid_match,
582 .init = unix_gid_init,
583 .update = unix_gid_update,
584 .alloc = unix_gid_alloc,
585};
586
587int unix_gid_cache_create(struct net *net)
588{
589 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
590 struct cache_detail *cd;
591 int err;
592
593 cd = cache_create_net(&unix_gid_cache_template, net);
594 if (IS_ERR(cd))
595 return PTR_ERR(cd);
596 err = cache_register_net(cd, net);
597 if (err) {
598 cache_destroy_net(cd, net);
599 return err;
600 }
601 sn->unix_gid_cache = cd;
602 return 0;
603}
604
605void unix_gid_cache_destroy(struct net *net)
606{
607 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
608 struct cache_detail *cd = sn->unix_gid_cache;
609
610 sn->unix_gid_cache = NULL;
611 cache_purge(cd);
612 cache_unregister_net(cd, net);
613 cache_destroy_net(cd, net);
614}
615
616static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
617{
618 struct unix_gid ug;
619 struct cache_head *ch;
620
621 ug.uid = uid;
622 ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
623 if (ch)
624 return container_of(ch, struct unix_gid, h);
625 else
626 return NULL;
627}
628
629static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
630{
631 struct unix_gid *ug;
632 struct group_info *gi;
633 int ret;
634 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
635 sunrpc_net_id);
636
637 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
638 if (!ug)
639 return ERR_PTR(-EAGAIN);
640 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
641 switch (ret) {
642 case -ENOENT:
643 return ERR_PTR(-ENOENT);
644 case -ETIMEDOUT:
645 return ERR_PTR(-ESHUTDOWN);
646 case 0:
647 gi = get_group_info(ug->gi);
648 cache_put(&ug->h, sn->unix_gid_cache);
649 return gi;
650 default:
651 return ERR_PTR(-EAGAIN);
652 }
653}
654
655int
656svcauth_unix_set_client(struct svc_rqst *rqstp)
657{
658 struct sockaddr_in *sin;
659 struct sockaddr_in6 *sin6, sin6_storage;
660 struct ip_map *ipm;
661 struct group_info *gi;
662 struct svc_cred *cred = &rqstp->rq_cred;
663 struct svc_xprt *xprt = rqstp->rq_xprt;
664 struct net *net = xprt->xpt_net;
665 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
666
667 switch (rqstp->rq_addr.ss_family) {
668 case AF_INET:
669 sin = svc_addr_in(rqstp);
670 sin6 = &sin6_storage;
671 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
672 break;
673 case AF_INET6:
674 sin6 = svc_addr_in6(rqstp);
675 break;
676 default:
677 BUG();
678 }
679
680 rqstp->rq_client = NULL;
681 if (rqstp->rq_proc == 0)
682 return SVC_OK;
683
684 ipm = ip_map_cached_get(xprt);
685 if (ipm == NULL)
686 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
687 &sin6->sin6_addr);
688
689 if (ipm == NULL)
690 return SVC_DENIED;
691
692 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
693 default:
694 BUG();
695 case -ETIMEDOUT:
696 return SVC_CLOSE;
697 case -EAGAIN:
698 return SVC_DROP;
699 case -ENOENT:
700 return SVC_DENIED;
701 case 0:
702 rqstp->rq_client = &ipm->m_client->h;
703 kref_get(&rqstp->rq_client->ref);
704 ip_map_cached_put(xprt, ipm);
705 break;
706 }
707
708 gi = unix_gid_find(cred->cr_uid, rqstp);
709 switch (PTR_ERR(gi)) {
710 case -EAGAIN:
711 return SVC_DROP;
712 case -ESHUTDOWN:
713 return SVC_CLOSE;
714 case -ENOENT:
715 break;
716 default:
717 put_group_info(cred->cr_group_info);
718 cred->cr_group_info = gi;
719 }
720 return SVC_OK;
721}
722
723EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
724
725static int
726svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
727{
728 struct kvec *argv = &rqstp->rq_arg.head[0];
729 struct kvec *resv = &rqstp->rq_res.head[0];
730 struct svc_cred *cred = &rqstp->rq_cred;
731
732 if (argv->iov_len < 3*4)
733 return SVC_GARBAGE;
734
735 if (svc_getu32(argv) != 0) {
736 dprintk("svc: bad null cred\n");
737 *authp = rpc_autherr_badcred;
738 return SVC_DENIED;
739 }
740 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
741 dprintk("svc: bad null verf\n");
742 *authp = rpc_autherr_badverf;
743 return SVC_DENIED;
744 }
745
746 /* Signal that mapping to nobody uid/gid is required */
747 cred->cr_uid = INVALID_UID;
748 cred->cr_gid = INVALID_GID;
749 cred->cr_group_info = groups_alloc(0);
750 if (cred->cr_group_info == NULL)
751 return SVC_CLOSE; /* kmalloc failure - client must retry */
752
753 /* Put NULL verifier */
754 svc_putnl(resv, RPC_AUTH_NULL);
755 svc_putnl(resv, 0);
756
757 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
758 return SVC_OK;
759}
760
761static int
762svcauth_null_release(struct svc_rqst *rqstp)
763{
764 if (rqstp->rq_client)
765 auth_domain_put(rqstp->rq_client);
766 rqstp->rq_client = NULL;
767 if (rqstp->rq_cred.cr_group_info)
768 put_group_info(rqstp->rq_cred.cr_group_info);
769 rqstp->rq_cred.cr_group_info = NULL;
770
771 return 0; /* don't drop */
772}
773
774
775struct auth_ops svcauth_null = {
776 .name = "null",
777 .owner = THIS_MODULE,
778 .flavour = RPC_AUTH_NULL,
779 .accept = svcauth_null_accept,
780 .release = svcauth_null_release,
781 .set_client = svcauth_unix_set_client,
782};
783
784
785static int
786svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
787{
788 struct kvec *argv = &rqstp->rq_arg.head[0];
789 struct kvec *resv = &rqstp->rq_res.head[0];
790 struct svc_cred *cred = &rqstp->rq_cred;
791 u32 slen, i;
792 int len = argv->iov_len;
793
794 if ((len -= 3*4) < 0)
795 return SVC_GARBAGE;
796
797 svc_getu32(argv); /* length */
798 svc_getu32(argv); /* time stamp */
799 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
800 if (slen > 64 || (len -= (slen + 3)*4) < 0)
801 goto badcred;
802 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
803 argv->iov_len -= slen*4;
804 /*
805 * Note: we skip uid_valid()/gid_valid() checks here for
806 * backwards compatibility with clients that use -1 id's.
807 * Instead, -1 uid or gid is later mapped to the
808 * (export-specific) anonymous id by nfsd_setuser.
809 * Supplementary gid's will be left alone.
810 */
811 cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
812 cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
813 slen = svc_getnl(argv); /* gids length */
814 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
815 goto badcred;
816 cred->cr_group_info = groups_alloc(slen);
817 if (cred->cr_group_info == NULL)
818 return SVC_CLOSE;
819 for (i = 0; i < slen; i++) {
820 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
821 cred->cr_group_info->gid[i] = kgid;
822 }
823 groups_sort(cred->cr_group_info);
824 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
825 *authp = rpc_autherr_badverf;
826 return SVC_DENIED;
827 }
828
829 /* Put NULL verifier */
830 svc_putnl(resv, RPC_AUTH_NULL);
831 svc_putnl(resv, 0);
832
833 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
834 return SVC_OK;
835
836badcred:
837 *authp = rpc_autherr_badcred;
838 return SVC_DENIED;
839}
840
841static int
842svcauth_unix_release(struct svc_rqst *rqstp)
843{
844 /* Verifier (such as it is) is already in place.
845 */
846 if (rqstp->rq_client)
847 auth_domain_put(rqstp->rq_client);
848 rqstp->rq_client = NULL;
849 if (rqstp->rq_cred.cr_group_info)
850 put_group_info(rqstp->rq_cred.cr_group_info);
851 rqstp->rq_cred.cr_group_info = NULL;
852
853 return 0;
854}
855
856
857struct auth_ops svcauth_unix = {
858 .name = "unix",
859 .owner = THIS_MODULE,
860 .flavour = RPC_AUTH_UNIX,
861 .accept = svcauth_unix_accept,
862 .release = svcauth_unix_release,
863 .domain_release = svcauth_unix_domain_release,
864 .set_client = svcauth_unix_set_client,
865};
866
867static const struct cache_detail ip_map_cache_template = {
868 .owner = THIS_MODULE,
869 .hash_size = IP_HASHMAX,
870 .name = "auth.unix.ip",
871 .cache_put = ip_map_put,
872 .cache_request = ip_map_request,
873 .cache_parse = ip_map_parse,
874 .cache_show = ip_map_show,
875 .match = ip_map_match,
876 .init = ip_map_init,
877 .update = update,
878 .alloc = ip_map_alloc,
879};
880
881int ip_map_cache_create(struct net *net)
882{
883 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
884 struct cache_detail *cd;
885 int err;
886
887 cd = cache_create_net(&ip_map_cache_template, net);
888 if (IS_ERR(cd))
889 return PTR_ERR(cd);
890 err = cache_register_net(cd, net);
891 if (err) {
892 cache_destroy_net(cd, net);
893 return err;
894 }
895 sn->ip_map_cache = cd;
896 return 0;
897}
898
899void ip_map_cache_destroy(struct net *net)
900{
901 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
902 struct cache_detail *cd = sn->ip_map_cache;
903
904 sn->ip_map_cache = NULL;
905 cache_purge(cd);
906 cache_unregister_net(cd, net);
907 cache_destroy_net(cd, net);
908}