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