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