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1#include <linux/types.h>
2#include <linux/sched.h>
3#include <linux/module.h>
4#include <linux/sunrpc/types.h>
5#include <linux/sunrpc/xdr.h>
6#include <linux/sunrpc/svcsock.h>
7#include <linux/sunrpc/svcauth.h>
8#include <linux/sunrpc/gss_api.h>
9#include <linux/err.h>
10#include <linux/seq_file.h>
11#include <linux/hash.h>
12#include <linux/string.h>
13#include <linux/slab.h>
14#include <net/sock.h>
15#include <net/ipv6.h>
16#include <linux/kernel.h>
17#define RPCDBG_FACILITY RPCDBG_AUTH
18
19#include <linux/sunrpc/clnt.h>
20
21#include "netns.h"
22
23/*
24 * AUTHUNIX and AUTHNULL credentials are both handled here.
25 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
26 * are always nobody (-2). i.e. we do the same IP address checks for
27 * AUTHNULL as for AUTHUNIX, and that is done here.
28 */
29
30
31struct unix_domain {
32 struct auth_domain h;
33 /* other stuff later */
34};
35
36extern struct auth_ops svcauth_null;
37extern struct auth_ops svcauth_unix;
38
39static void svcauth_unix_domain_release(struct auth_domain *dom)
40{
41 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
42
43 kfree(dom->name);
44 kfree(ud);
45}
46
47struct auth_domain *unix_domain_find(char *name)
48{
49 struct auth_domain *rv;
50 struct unix_domain *new = NULL;
51
52 rv = auth_domain_lookup(name, NULL);
53 while(1) {
54 if (rv) {
55 if (new && rv != &new->h)
56 svcauth_unix_domain_release(&new->h);
57
58 if (rv->flavour != &svcauth_unix) {
59 auth_domain_put(rv);
60 return NULL;
61 }
62 return rv;
63 }
64
65 new = kmalloc(sizeof(*new), GFP_KERNEL);
66 if (new == NULL)
67 return NULL;
68 kref_init(&new->h.ref);
69 new->h.name = kstrdup(name, GFP_KERNEL);
70 if (new->h.name == NULL) {
71 kfree(new);
72 return NULL;
73 }
74 new->h.flavour = &svcauth_unix;
75 rv = auth_domain_lookup(name, &new->h);
76 }
77}
78EXPORT_SYMBOL_GPL(unix_domain_find);
79
80
81/**************************************************
82 * cache for IP address to unix_domain
83 * as needed by AUTH_UNIX
84 */
85#define IP_HASHBITS 8
86#define IP_HASHMAX (1<<IP_HASHBITS)
87
88struct ip_map {
89 struct cache_head h;
90 char m_class[8]; /* e.g. "nfsd" */
91 struct in6_addr m_addr;
92 struct unix_domain *m_client;
93};
94
95static void ip_map_put(struct kref *kref)
96{
97 struct cache_head *item = container_of(kref, struct cache_head, ref);
98 struct ip_map *im = container_of(item, struct ip_map,h);
99
100 if (test_bit(CACHE_VALID, &item->flags) &&
101 !test_bit(CACHE_NEGATIVE, &item->flags))
102 auth_domain_put(&im->m_client->h);
103 kfree(im);
104}
105
106#if IP_HASHBITS == 8
107/* hash_long on a 64 bit machine is currently REALLY BAD for
108 * IP addresses in reverse-endian (i.e. on a little-endian machine).
109 * So use a trivial but reliable hash instead
110 */
111static inline int hash_ip(__be32 ip)
112{
113 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
114 return (hash ^ (hash>>8)) & 0xff;
115}
116#endif
117static inline int hash_ip6(struct in6_addr ip)
118{
119 return (hash_ip(ip.s6_addr32[0]) ^
120 hash_ip(ip.s6_addr32[1]) ^
121 hash_ip(ip.s6_addr32[2]) ^
122 hash_ip(ip.s6_addr32[3]));
123}
124static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
125{
126 struct ip_map *orig = container_of(corig, struct ip_map, h);
127 struct ip_map *new = container_of(cnew, struct ip_map, h);
128 return strcmp(orig->m_class, new->m_class) == 0 &&
129 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
130}
131static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
132{
133 struct ip_map *new = container_of(cnew, struct ip_map, h);
134 struct ip_map *item = container_of(citem, struct ip_map, h);
135
136 strcpy(new->m_class, item->m_class);
137 ipv6_addr_copy(&new->m_addr, &item->m_addr);
138}
139static void update(struct cache_head *cnew, struct cache_head *citem)
140{
141 struct ip_map *new = container_of(cnew, struct ip_map, h);
142 struct ip_map *item = container_of(citem, struct ip_map, h);
143
144 kref_get(&item->m_client->h.ref);
145 new->m_client = item->m_client;
146}
147static struct cache_head *ip_map_alloc(void)
148{
149 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
150 if (i)
151 return &i->h;
152 else
153 return NULL;
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 int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
174{
175 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
176}
177
178static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
179static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
180
181static int ip_map_parse(struct cache_detail *cd,
182 char *mesg, int mlen)
183{
184 /* class ipaddress [domainname] */
185 /* should be safe just to use the start of the input buffer
186 * for scratch: */
187 char *buf = mesg;
188 int len;
189 char class[8];
190 union {
191 struct sockaddr sa;
192 struct sockaddr_in s4;
193 struct sockaddr_in6 s6;
194 } address;
195 struct sockaddr_in6 sin6;
196 int err;
197
198 struct ip_map *ipmp;
199 struct auth_domain *dom;
200 time_t expiry;
201
202 if (mesg[mlen-1] != '\n')
203 return -EINVAL;
204 mesg[mlen-1] = 0;
205
206 /* class */
207 len = qword_get(&mesg, class, sizeof(class));
208 if (len <= 0) return -EINVAL;
209
210 /* ip address */
211 len = qword_get(&mesg, buf, mlen);
212 if (len <= 0) return -EINVAL;
213
214 if (rpc_pton(buf, len, &address.sa, sizeof(address)) == 0)
215 return -EINVAL;
216 switch (address.sa.sa_family) {
217 case AF_INET:
218 /* Form a mapped IPv4 address in sin6 */
219 sin6.sin6_family = AF_INET6;
220 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
221 &sin6.sin6_addr);
222 break;
223#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
224 case AF_INET6:
225 memcpy(&sin6, &address.s6, sizeof(sin6));
226 break;
227#endif
228 default:
229 return -EINVAL;
230 }
231
232 expiry = get_expiry(&mesg);
233 if (expiry ==0)
234 return -EINVAL;
235
236 /* domainname, or empty for NEGATIVE */
237 len = qword_get(&mesg, buf, mlen);
238 if (len < 0) return -EINVAL;
239
240 if (len) {
241 dom = unix_domain_find(buf);
242 if (dom == NULL)
243 return -ENOENT;
244 } else
245 dom = NULL;
246
247 /* IPv6 scope IDs are ignored for now */
248 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
249 if (ipmp) {
250 err = __ip_map_update(cd, ipmp,
251 container_of(dom, struct unix_domain, h),
252 expiry);
253 } else
254 err = -ENOMEM;
255
256 if (dom)
257 auth_domain_put(dom);
258
259 cache_flush();
260 return err;
261}
262
263static int ip_map_show(struct seq_file *m,
264 struct cache_detail *cd,
265 struct cache_head *h)
266{
267 struct ip_map *im;
268 struct in6_addr addr;
269 char *dom = "-no-domain-";
270
271 if (h == NULL) {
272 seq_puts(m, "#class IP domain\n");
273 return 0;
274 }
275 im = container_of(h, struct ip_map, h);
276 /* class addr domain */
277 ipv6_addr_copy(&addr, &im->m_addr);
278
279 if (test_bit(CACHE_VALID, &h->flags) &&
280 !test_bit(CACHE_NEGATIVE, &h->flags))
281 dom = im->m_client->h.name;
282
283 if (ipv6_addr_v4mapped(&addr)) {
284 seq_printf(m, "%s %pI4 %s\n",
285 im->m_class, &addr.s6_addr32[3], dom);
286 } else {
287 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
288 }
289 return 0;
290}
291
292
293static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
294 struct in6_addr *addr)
295{
296 struct ip_map ip;
297 struct cache_head *ch;
298
299 strcpy(ip.m_class, class);
300 ipv6_addr_copy(&ip.m_addr, addr);
301 ch = sunrpc_cache_lookup(cd, &ip.h,
302 hash_str(class, IP_HASHBITS) ^
303 hash_ip6(*addr));
304
305 if (ch)
306 return container_of(ch, struct ip_map, h);
307 else
308 return NULL;
309}
310
311static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
312 struct in6_addr *addr)
313{
314 struct sunrpc_net *sn;
315
316 sn = net_generic(net, sunrpc_net_id);
317 return __ip_map_lookup(sn->ip_map_cache, class, addr);
318}
319
320static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
321 struct unix_domain *udom, time_t expiry)
322{
323 struct ip_map ip;
324 struct cache_head *ch;
325
326 ip.m_client = udom;
327 ip.h.flags = 0;
328 if (!udom)
329 set_bit(CACHE_NEGATIVE, &ip.h.flags);
330 ip.h.expiry_time = expiry;
331 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
332 hash_str(ipm->m_class, IP_HASHBITS) ^
333 hash_ip6(ipm->m_addr));
334 if (!ch)
335 return -ENOMEM;
336 cache_put(ch, cd);
337 return 0;
338}
339
340static inline int ip_map_update(struct net *net, struct ip_map *ipm,
341 struct unix_domain *udom, time_t expiry)
342{
343 struct sunrpc_net *sn;
344
345 sn = net_generic(net, sunrpc_net_id);
346 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
347}
348
349
350void svcauth_unix_purge(void)
351{
352 struct net *net;
353
354 for_each_net(net) {
355 struct sunrpc_net *sn;
356
357 sn = net_generic(net, sunrpc_net_id);
358 cache_purge(sn->ip_map_cache);
359 }
360}
361EXPORT_SYMBOL_GPL(svcauth_unix_purge);
362
363static inline struct ip_map *
364ip_map_cached_get(struct svc_xprt *xprt)
365{
366 struct ip_map *ipm = NULL;
367 struct sunrpc_net *sn;
368
369 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
370 spin_lock(&xprt->xpt_lock);
371 ipm = xprt->xpt_auth_cache;
372 if (ipm != NULL) {
373 if (!cache_valid(&ipm->h)) {
374 /*
375 * The entry has been invalidated since it was
376 * remembered, e.g. by a second mount from the
377 * same IP address.
378 */
379 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
380 xprt->xpt_auth_cache = NULL;
381 spin_unlock(&xprt->xpt_lock);
382 cache_put(&ipm->h, sn->ip_map_cache);
383 return NULL;
384 }
385 cache_get(&ipm->h);
386 }
387 spin_unlock(&xprt->xpt_lock);
388 }
389 return ipm;
390}
391
392static inline void
393ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
394{
395 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
396 spin_lock(&xprt->xpt_lock);
397 if (xprt->xpt_auth_cache == NULL) {
398 /* newly cached, keep the reference */
399 xprt->xpt_auth_cache = ipm;
400 ipm = NULL;
401 }
402 spin_unlock(&xprt->xpt_lock);
403 }
404 if (ipm) {
405 struct sunrpc_net *sn;
406
407 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
408 cache_put(&ipm->h, sn->ip_map_cache);
409 }
410}
411
412void
413svcauth_unix_info_release(struct svc_xprt *xpt)
414{
415 struct ip_map *ipm;
416
417 ipm = xpt->xpt_auth_cache;
418 if (ipm != NULL) {
419 struct sunrpc_net *sn;
420
421 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
422 cache_put(&ipm->h, sn->ip_map_cache);
423 }
424}
425
426/****************************************************************************
427 * auth.unix.gid cache
428 * simple cache to map a UID to a list of GIDs
429 * because AUTH_UNIX aka AUTH_SYS has a max of 16
430 */
431#define GID_HASHBITS 8
432#define GID_HASHMAX (1<<GID_HASHBITS)
433
434struct unix_gid {
435 struct cache_head h;
436 uid_t uid;
437 struct group_info *gi;
438};
439static struct cache_head *gid_table[GID_HASHMAX];
440
441static void unix_gid_put(struct kref *kref)
442{
443 struct cache_head *item = container_of(kref, struct cache_head, ref);
444 struct unix_gid *ug = container_of(item, struct unix_gid, h);
445 if (test_bit(CACHE_VALID, &item->flags) &&
446 !test_bit(CACHE_NEGATIVE, &item->flags))
447 put_group_info(ug->gi);
448 kfree(ug);
449}
450
451static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
452{
453 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
454 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
455 return orig->uid == new->uid;
456}
457static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
458{
459 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
460 struct unix_gid *item = container_of(citem, struct unix_gid, h);
461 new->uid = item->uid;
462}
463static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
464{
465 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
466 struct unix_gid *item = container_of(citem, struct unix_gid, h);
467
468 get_group_info(item->gi);
469 new->gi = item->gi;
470}
471static struct cache_head *unix_gid_alloc(void)
472{
473 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
474 if (g)
475 return &g->h;
476 else
477 return NULL;
478}
479
480static void unix_gid_request(struct cache_detail *cd,
481 struct cache_head *h,
482 char **bpp, int *blen)
483{
484 char tuid[20];
485 struct unix_gid *ug = container_of(h, struct unix_gid, h);
486
487 snprintf(tuid, 20, "%u", ug->uid);
488 qword_add(bpp, blen, tuid);
489 (*bpp)[-1] = '\n';
490}
491
492static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
493{
494 return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
495}
496
497static struct unix_gid *unix_gid_lookup(uid_t uid);
498extern struct cache_detail unix_gid_cache;
499
500static int unix_gid_parse(struct cache_detail *cd,
501 char *mesg, int mlen)
502{
503 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
504 int uid;
505 int gids;
506 int rv;
507 int i;
508 int err;
509 time_t expiry;
510 struct unix_gid ug, *ugp;
511
512 if (mlen <= 0 || mesg[mlen-1] != '\n')
513 return -EINVAL;
514 mesg[mlen-1] = 0;
515
516 rv = get_int(&mesg, &uid);
517 if (rv)
518 return -EINVAL;
519 ug.uid = uid;
520
521 expiry = get_expiry(&mesg);
522 if (expiry == 0)
523 return -EINVAL;
524
525 rv = get_int(&mesg, &gids);
526 if (rv || gids < 0 || gids > 8192)
527 return -EINVAL;
528
529 ug.gi = groups_alloc(gids);
530 if (!ug.gi)
531 return -ENOMEM;
532
533 for (i = 0 ; i < gids ; i++) {
534 int gid;
535 rv = get_int(&mesg, &gid);
536 err = -EINVAL;
537 if (rv)
538 goto out;
539 GROUP_AT(ug.gi, i) = gid;
540 }
541
542 ugp = unix_gid_lookup(uid);
543 if (ugp) {
544 struct cache_head *ch;
545 ug.h.flags = 0;
546 ug.h.expiry_time = expiry;
547 ch = sunrpc_cache_update(&unix_gid_cache,
548 &ug.h, &ugp->h,
549 hash_long(uid, GID_HASHBITS));
550 if (!ch)
551 err = -ENOMEM;
552 else {
553 err = 0;
554 cache_put(ch, &unix_gid_cache);
555 }
556 } else
557 err = -ENOMEM;
558 out:
559 if (ug.gi)
560 put_group_info(ug.gi);
561 return err;
562}
563
564static int unix_gid_show(struct seq_file *m,
565 struct cache_detail *cd,
566 struct cache_head *h)
567{
568 struct unix_gid *ug;
569 int i;
570 int glen;
571
572 if (h == NULL) {
573 seq_puts(m, "#uid cnt: gids...\n");
574 return 0;
575 }
576 ug = container_of(h, struct unix_gid, h);
577 if (test_bit(CACHE_VALID, &h->flags) &&
578 !test_bit(CACHE_NEGATIVE, &h->flags))
579 glen = ug->gi->ngroups;
580 else
581 glen = 0;
582
583 seq_printf(m, "%u %d:", ug->uid, glen);
584 for (i = 0; i < glen; i++)
585 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
586 seq_printf(m, "\n");
587 return 0;
588}
589
590struct cache_detail unix_gid_cache = {
591 .owner = THIS_MODULE,
592 .hash_size = GID_HASHMAX,
593 .hash_table = gid_table,
594 .name = "auth.unix.gid",
595 .cache_put = unix_gid_put,
596 .cache_upcall = unix_gid_upcall,
597 .cache_parse = unix_gid_parse,
598 .cache_show = unix_gid_show,
599 .match = unix_gid_match,
600 .init = unix_gid_init,
601 .update = unix_gid_update,
602 .alloc = unix_gid_alloc,
603};
604
605static struct unix_gid *unix_gid_lookup(uid_t uid)
606{
607 struct unix_gid ug;
608 struct cache_head *ch;
609
610 ug.uid = uid;
611 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
612 hash_long(uid, GID_HASHBITS));
613 if (ch)
614 return container_of(ch, struct unix_gid, h);
615 else
616 return NULL;
617}
618
619static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
620{
621 struct unix_gid *ug;
622 struct group_info *gi;
623 int ret;
624
625 ug = unix_gid_lookup(uid);
626 if (!ug)
627 return ERR_PTR(-EAGAIN);
628 ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
629 switch (ret) {
630 case -ENOENT:
631 return ERR_PTR(-ENOENT);
632 case -ETIMEDOUT:
633 return ERR_PTR(-ESHUTDOWN);
634 case 0:
635 gi = get_group_info(ug->gi);
636 cache_put(&ug->h, &unix_gid_cache);
637 return gi;
638 default:
639 return ERR_PTR(-EAGAIN);
640 }
641}
642
643int
644svcauth_unix_set_client(struct svc_rqst *rqstp)
645{
646 struct sockaddr_in *sin;
647 struct sockaddr_in6 *sin6, sin6_storage;
648 struct ip_map *ipm;
649 struct group_info *gi;
650 struct svc_cred *cred = &rqstp->rq_cred;
651 struct svc_xprt *xprt = rqstp->rq_xprt;
652 struct net *net = xprt->xpt_net;
653 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
654
655 switch (rqstp->rq_addr.ss_family) {
656 case AF_INET:
657 sin = svc_addr_in(rqstp);
658 sin6 = &sin6_storage;
659 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
660 break;
661 case AF_INET6:
662 sin6 = svc_addr_in6(rqstp);
663 break;
664 default:
665 BUG();
666 }
667
668 rqstp->rq_client = NULL;
669 if (rqstp->rq_proc == 0)
670 return SVC_OK;
671
672 ipm = ip_map_cached_get(xprt);
673 if (ipm == NULL)
674 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
675 &sin6->sin6_addr);
676
677 if (ipm == NULL)
678 return SVC_DENIED;
679
680 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
681 default:
682 BUG();
683 case -ETIMEDOUT:
684 return SVC_CLOSE;
685 case -EAGAIN:
686 return SVC_DROP;
687 case -ENOENT:
688 return SVC_DENIED;
689 case 0:
690 rqstp->rq_client = &ipm->m_client->h;
691 kref_get(&rqstp->rq_client->ref);
692 ip_map_cached_put(xprt, ipm);
693 break;
694 }
695
696 gi = unix_gid_find(cred->cr_uid, rqstp);
697 switch (PTR_ERR(gi)) {
698 case -EAGAIN:
699 return SVC_DROP;
700 case -ESHUTDOWN:
701 return SVC_CLOSE;
702 case -ENOENT:
703 break;
704 default:
705 put_group_info(cred->cr_group_info);
706 cred->cr_group_info = gi;
707 }
708 return SVC_OK;
709}
710
711EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
712
713static int
714svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
715{
716 struct kvec *argv = &rqstp->rq_arg.head[0];
717 struct kvec *resv = &rqstp->rq_res.head[0];
718 struct svc_cred *cred = &rqstp->rq_cred;
719
720 cred->cr_group_info = NULL;
721 rqstp->rq_client = NULL;
722
723 if (argv->iov_len < 3*4)
724 return SVC_GARBAGE;
725
726 if (svc_getu32(argv) != 0) {
727 dprintk("svc: bad null cred\n");
728 *authp = rpc_autherr_badcred;
729 return SVC_DENIED;
730 }
731 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
732 dprintk("svc: bad null verf\n");
733 *authp = rpc_autherr_badverf;
734 return SVC_DENIED;
735 }
736
737 /* Signal that mapping to nobody uid/gid is required */
738 cred->cr_uid = (uid_t) -1;
739 cred->cr_gid = (gid_t) -1;
740 cred->cr_group_info = groups_alloc(0);
741 if (cred->cr_group_info == NULL)
742 return SVC_CLOSE; /* kmalloc failure - client must retry */
743
744 /* Put NULL verifier */
745 svc_putnl(resv, RPC_AUTH_NULL);
746 svc_putnl(resv, 0);
747
748 rqstp->rq_flavor = RPC_AUTH_NULL;
749 return SVC_OK;
750}
751
752static int
753svcauth_null_release(struct svc_rqst *rqstp)
754{
755 if (rqstp->rq_client)
756 auth_domain_put(rqstp->rq_client);
757 rqstp->rq_client = NULL;
758 if (rqstp->rq_cred.cr_group_info)
759 put_group_info(rqstp->rq_cred.cr_group_info);
760 rqstp->rq_cred.cr_group_info = NULL;
761
762 return 0; /* don't drop */
763}
764
765
766struct auth_ops svcauth_null = {
767 .name = "null",
768 .owner = THIS_MODULE,
769 .flavour = RPC_AUTH_NULL,
770 .accept = svcauth_null_accept,
771 .release = svcauth_null_release,
772 .set_client = svcauth_unix_set_client,
773};
774
775
776static int
777svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
778{
779 struct kvec *argv = &rqstp->rq_arg.head[0];
780 struct kvec *resv = &rqstp->rq_res.head[0];
781 struct svc_cred *cred = &rqstp->rq_cred;
782 u32 slen, i;
783 int len = argv->iov_len;
784
785 cred->cr_group_info = NULL;
786 rqstp->rq_client = NULL;
787
788 if ((len -= 3*4) < 0)
789 return SVC_GARBAGE;
790
791 svc_getu32(argv); /* length */
792 svc_getu32(argv); /* time stamp */
793 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
794 if (slen > 64 || (len -= (slen + 3)*4) < 0)
795 goto badcred;
796 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
797 argv->iov_len -= slen*4;
798
799 cred->cr_uid = svc_getnl(argv); /* uid */
800 cred->cr_gid = svc_getnl(argv); /* gid */
801 slen = svc_getnl(argv); /* gids length */
802 if (slen > 16 || (len -= (slen + 2)*4) < 0)
803 goto badcred;
804 cred->cr_group_info = groups_alloc(slen);
805 if (cred->cr_group_info == NULL)
806 return SVC_CLOSE;
807 for (i = 0; i < slen; i++)
808 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
809 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
810 *authp = rpc_autherr_badverf;
811 return SVC_DENIED;
812 }
813
814 /* Put NULL verifier */
815 svc_putnl(resv, RPC_AUTH_NULL);
816 svc_putnl(resv, 0);
817
818 rqstp->rq_flavor = RPC_AUTH_UNIX;
819 return SVC_OK;
820
821badcred:
822 *authp = rpc_autherr_badcred;
823 return SVC_DENIED;
824}
825
826static int
827svcauth_unix_release(struct svc_rqst *rqstp)
828{
829 /* Verifier (such as it is) is already in place.
830 */
831 if (rqstp->rq_client)
832 auth_domain_put(rqstp->rq_client);
833 rqstp->rq_client = NULL;
834 if (rqstp->rq_cred.cr_group_info)
835 put_group_info(rqstp->rq_cred.cr_group_info);
836 rqstp->rq_cred.cr_group_info = NULL;
837
838 return 0;
839}
840
841
842struct auth_ops svcauth_unix = {
843 .name = "unix",
844 .owner = THIS_MODULE,
845 .flavour = RPC_AUTH_UNIX,
846 .accept = svcauth_unix_accept,
847 .release = svcauth_unix_release,
848 .domain_release = svcauth_unix_domain_release,
849 .set_client = svcauth_unix_set_client,
850};
851
852int ip_map_cache_create(struct net *net)
853{
854 int err = -ENOMEM;
855 struct cache_detail *cd;
856 struct cache_head **tbl;
857 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
858
859 cd = kzalloc(sizeof(struct cache_detail), GFP_KERNEL);
860 if (cd == NULL)
861 goto err_cd;
862
863 tbl = kzalloc(IP_HASHMAX * sizeof(struct cache_head *), GFP_KERNEL);
864 if (tbl == NULL)
865 goto err_tbl;
866
867 cd->owner = THIS_MODULE,
868 cd->hash_size = IP_HASHMAX,
869 cd->hash_table = tbl,
870 cd->name = "auth.unix.ip",
871 cd->cache_put = ip_map_put,
872 cd->cache_upcall = ip_map_upcall,
873 cd->cache_parse = ip_map_parse,
874 cd->cache_show = ip_map_show,
875 cd->match = ip_map_match,
876 cd->init = ip_map_init,
877 cd->update = update,
878 cd->alloc = ip_map_alloc,
879
880 err = cache_register_net(cd, net);
881 if (err)
882 goto err_reg;
883
884 sn->ip_map_cache = cd;
885 return 0;
886
887err_reg:
888 kfree(tbl);
889err_tbl:
890 kfree(cd);
891err_cd:
892 return err;
893}
894
895void ip_map_cache_destroy(struct net *net)
896{
897 struct sunrpc_net *sn;
898
899 sn = net_generic(net, sunrpc_net_id);
900 cache_purge(sn->ip_map_cache);
901 cache_unregister_net(sn->ip_map_cache, net);
902 kfree(sn->ip_map_cache->hash_table);
903 kfree(sn->ip_map_cache);
904}
1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/types.h>
3#include <linux/sched.h>
4#include <linux/module.h>
5#include <linux/sunrpc/types.h>
6#include <linux/sunrpc/xdr.h>
7#include <linux/sunrpc/svcsock.h>
8#include <linux/sunrpc/svcauth.h>
9#include <linux/sunrpc/gss_api.h>
10#include <linux/sunrpc/addr.h>
11#include <linux/err.h>
12#include <linux/seq_file.h>
13#include <linux/hash.h>
14#include <linux/string.h>
15#include <linux/slab.h>
16#include <net/sock.h>
17#include <net/ipv6.h>
18#include <linux/kernel.h>
19#include <linux/user_namespace.h>
20#define RPCDBG_FACILITY RPCDBG_AUTH
21
22
23#include "netns.h"
24
25/*
26 * AUTHUNIX and AUTHNULL credentials are both handled here.
27 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
28 * are always nobody (-2). i.e. we do the same IP address checks for
29 * AUTHNULL as for AUTHUNIX, and that is done here.
30 */
31
32
33struct unix_domain {
34 struct auth_domain h;
35 /* other stuff later */
36};
37
38extern struct auth_ops svcauth_null;
39extern struct auth_ops svcauth_unix;
40
41static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
42{
43 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
44 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
45
46 kfree(dom->name);
47 kfree(ud);
48}
49
50static void svcauth_unix_domain_release(struct auth_domain *dom)
51{
52 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
53}
54
55struct auth_domain *unix_domain_find(char *name)
56{
57 struct auth_domain *rv;
58 struct unix_domain *new = NULL;
59
60 rv = auth_domain_find(name);
61 while(1) {
62 if (rv) {
63 if (new && rv != &new->h)
64 svcauth_unix_domain_release(&new->h);
65
66 if (rv->flavour != &svcauth_unix) {
67 auth_domain_put(rv);
68 return NULL;
69 }
70 return rv;
71 }
72
73 new = kmalloc(sizeof(*new), GFP_KERNEL);
74 if (new == NULL)
75 return NULL;
76 kref_init(&new->h.ref);
77 new->h.name = kstrdup(name, GFP_KERNEL);
78 if (new->h.name == NULL) {
79 kfree(new);
80 return NULL;
81 }
82 new->h.flavour = &svcauth_unix;
83 rv = auth_domain_lookup(name, &new->h);
84 }
85}
86EXPORT_SYMBOL_GPL(unix_domain_find);
87
88
89/**************************************************
90 * cache for IP address to unix_domain
91 * as needed by AUTH_UNIX
92 */
93#define IP_HASHBITS 8
94#define IP_HASHMAX (1<<IP_HASHBITS)
95
96struct ip_map {
97 struct cache_head h;
98 char m_class[8]; /* e.g. "nfsd" */
99 struct in6_addr m_addr;
100 struct unix_domain *m_client;
101 struct rcu_head m_rcu;
102};
103
104static void ip_map_put(struct kref *kref)
105{
106 struct cache_head *item = container_of(kref, struct cache_head, ref);
107 struct ip_map *im = container_of(item, struct ip_map,h);
108
109 if (test_bit(CACHE_VALID, &item->flags) &&
110 !test_bit(CACHE_NEGATIVE, &item->flags))
111 auth_domain_put(&im->m_client->h);
112 kfree_rcu(im, m_rcu);
113}
114
115static inline int hash_ip6(const struct in6_addr *ip)
116{
117 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
118}
119static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
120{
121 struct ip_map *orig = container_of(corig, struct ip_map, h);
122 struct ip_map *new = container_of(cnew, struct ip_map, h);
123 return strcmp(orig->m_class, new->m_class) == 0 &&
124 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
125}
126static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
127{
128 struct ip_map *new = container_of(cnew, struct ip_map, h);
129 struct ip_map *item = container_of(citem, struct ip_map, h);
130
131 strcpy(new->m_class, item->m_class);
132 new->m_addr = item->m_addr;
133}
134static void update(struct cache_head *cnew, struct cache_head *citem)
135{
136 struct ip_map *new = container_of(cnew, struct ip_map, h);
137 struct ip_map *item = container_of(citem, struct ip_map, h);
138
139 kref_get(&item->m_client->h.ref);
140 new->m_client = item->m_client;
141}
142static struct cache_head *ip_map_alloc(void)
143{
144 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
145 if (i)
146 return &i->h;
147 else
148 return NULL;
149}
150
151static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
152{
153 return sunrpc_cache_pipe_upcall(cd, h);
154}
155
156static void ip_map_request(struct cache_detail *cd,
157 struct cache_head *h,
158 char **bpp, int *blen)
159{
160 char text_addr[40];
161 struct ip_map *im = container_of(h, struct ip_map, h);
162
163 if (ipv6_addr_v4mapped(&(im->m_addr))) {
164 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
165 } else {
166 snprintf(text_addr, 40, "%pI6", &im->m_addr);
167 }
168 qword_add(bpp, blen, im->m_class);
169 qword_add(bpp, blen, text_addr);
170 (*bpp)[-1] = '\n';
171}
172
173static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
174static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
175
176static int ip_map_parse(struct cache_detail *cd,
177 char *mesg, int mlen)
178{
179 /* class ipaddress [domainname] */
180 /* should be safe just to use the start of the input buffer
181 * for scratch: */
182 char *buf = mesg;
183 int len;
184 char class[8];
185 union {
186 struct sockaddr sa;
187 struct sockaddr_in s4;
188 struct sockaddr_in6 s6;
189 } address;
190 struct sockaddr_in6 sin6;
191 int err;
192
193 struct ip_map *ipmp;
194 struct auth_domain *dom;
195 time64_t expiry;
196
197 if (mesg[mlen-1] != '\n')
198 return -EINVAL;
199 mesg[mlen-1] = 0;
200
201 /* class */
202 len = qword_get(&mesg, class, sizeof(class));
203 if (len <= 0) return -EINVAL;
204
205 /* ip address */
206 len = qword_get(&mesg, buf, mlen);
207 if (len <= 0) return -EINVAL;
208
209 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
210 return -EINVAL;
211 switch (address.sa.sa_family) {
212 case AF_INET:
213 /* Form a mapped IPv4 address in sin6 */
214 sin6.sin6_family = AF_INET6;
215 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
216 &sin6.sin6_addr);
217 break;
218#if IS_ENABLED(CONFIG_IPV6)
219 case AF_INET6:
220 memcpy(&sin6, &address.s6, sizeof(sin6));
221 break;
222#endif
223 default:
224 return -EINVAL;
225 }
226
227 expiry = get_expiry(&mesg);
228 if (expiry ==0)
229 return -EINVAL;
230
231 /* domainname, or empty for NEGATIVE */
232 len = qword_get(&mesg, buf, mlen);
233 if (len < 0) return -EINVAL;
234
235 if (len) {
236 dom = unix_domain_find(buf);
237 if (dom == NULL)
238 return -ENOENT;
239 } else
240 dom = NULL;
241
242 /* IPv6 scope IDs are ignored for now */
243 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
244 if (ipmp) {
245 err = __ip_map_update(cd, ipmp,
246 container_of(dom, struct unix_domain, h),
247 expiry);
248 } else
249 err = -ENOMEM;
250
251 if (dom)
252 auth_domain_put(dom);
253
254 cache_flush();
255 return err;
256}
257
258static int ip_map_show(struct seq_file *m,
259 struct cache_detail *cd,
260 struct cache_head *h)
261{
262 struct ip_map *im;
263 struct in6_addr addr;
264 char *dom = "-no-domain-";
265
266 if (h == NULL) {
267 seq_puts(m, "#class IP domain\n");
268 return 0;
269 }
270 im = container_of(h, struct ip_map, h);
271 /* class addr domain */
272 addr = im->m_addr;
273
274 if (test_bit(CACHE_VALID, &h->flags) &&
275 !test_bit(CACHE_NEGATIVE, &h->flags))
276 dom = im->m_client->h.name;
277
278 if (ipv6_addr_v4mapped(&addr)) {
279 seq_printf(m, "%s %pI4 %s\n",
280 im->m_class, &addr.s6_addr32[3], dom);
281 } else {
282 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
283 }
284 return 0;
285}
286
287
288static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
289 struct in6_addr *addr)
290{
291 struct ip_map ip;
292 struct cache_head *ch;
293
294 strcpy(ip.m_class, class);
295 ip.m_addr = *addr;
296 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
297 hash_str(class, IP_HASHBITS) ^
298 hash_ip6(addr));
299
300 if (ch)
301 return container_of(ch, struct ip_map, h);
302 else
303 return NULL;
304}
305
306static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
307 struct unix_domain *udom, time64_t expiry)
308{
309 struct ip_map ip;
310 struct cache_head *ch;
311
312 ip.m_client = udom;
313 ip.h.flags = 0;
314 if (!udom)
315 set_bit(CACHE_NEGATIVE, &ip.h.flags);
316 ip.h.expiry_time = expiry;
317 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
318 hash_str(ipm->m_class, IP_HASHBITS) ^
319 hash_ip6(&ipm->m_addr));
320 if (!ch)
321 return -ENOMEM;
322 cache_put(ch, cd);
323 return 0;
324}
325
326void svcauth_unix_purge(struct net *net)
327{
328 struct sunrpc_net *sn;
329
330 sn = net_generic(net, sunrpc_net_id);
331 cache_purge(sn->ip_map_cache);
332}
333EXPORT_SYMBOL_GPL(svcauth_unix_purge);
334
335static inline struct ip_map *
336ip_map_cached_get(struct svc_xprt *xprt)
337{
338 struct ip_map *ipm = NULL;
339 struct sunrpc_net *sn;
340
341 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
342 spin_lock(&xprt->xpt_lock);
343 ipm = xprt->xpt_auth_cache;
344 if (ipm != NULL) {
345 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
346 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
347 /*
348 * The entry has been invalidated since it was
349 * remembered, e.g. by a second mount from the
350 * same IP address.
351 */
352 xprt->xpt_auth_cache = NULL;
353 spin_unlock(&xprt->xpt_lock);
354 cache_put(&ipm->h, sn->ip_map_cache);
355 return NULL;
356 }
357 cache_get(&ipm->h);
358 }
359 spin_unlock(&xprt->xpt_lock);
360 }
361 return ipm;
362}
363
364static inline void
365ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
366{
367 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
368 spin_lock(&xprt->xpt_lock);
369 if (xprt->xpt_auth_cache == NULL) {
370 /* newly cached, keep the reference */
371 xprt->xpt_auth_cache = ipm;
372 ipm = NULL;
373 }
374 spin_unlock(&xprt->xpt_lock);
375 }
376 if (ipm) {
377 struct sunrpc_net *sn;
378
379 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
380 cache_put(&ipm->h, sn->ip_map_cache);
381 }
382}
383
384void
385svcauth_unix_info_release(struct svc_xprt *xpt)
386{
387 struct ip_map *ipm;
388
389 ipm = xpt->xpt_auth_cache;
390 if (ipm != NULL) {
391 struct sunrpc_net *sn;
392
393 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
394 cache_put(&ipm->h, sn->ip_map_cache);
395 }
396}
397
398/****************************************************************************
399 * auth.unix.gid cache
400 * simple cache to map a UID to a list of GIDs
401 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
402 */
403#define GID_HASHBITS 8
404#define GID_HASHMAX (1<<GID_HASHBITS)
405
406struct unix_gid {
407 struct cache_head h;
408 kuid_t uid;
409 struct group_info *gi;
410 struct rcu_head rcu;
411};
412
413static int unix_gid_hash(kuid_t uid)
414{
415 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
416}
417
418static void unix_gid_put(struct kref *kref)
419{
420 struct cache_head *item = container_of(kref, struct cache_head, ref);
421 struct unix_gid *ug = container_of(item, struct unix_gid, h);
422 if (test_bit(CACHE_VALID, &item->flags) &&
423 !test_bit(CACHE_NEGATIVE, &item->flags))
424 put_group_info(ug->gi);
425 kfree_rcu(ug, rcu);
426}
427
428static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
429{
430 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
431 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
432 return uid_eq(orig->uid, new->uid);
433}
434static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
435{
436 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
437 struct unix_gid *item = container_of(citem, struct unix_gid, h);
438 new->uid = item->uid;
439}
440static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
441{
442 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
443 struct unix_gid *item = container_of(citem, struct unix_gid, h);
444
445 get_group_info(item->gi);
446 new->gi = item->gi;
447}
448static struct cache_head *unix_gid_alloc(void)
449{
450 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
451 if (g)
452 return &g->h;
453 else
454 return NULL;
455}
456
457static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
458{
459 return sunrpc_cache_pipe_upcall_timeout(cd, h);
460}
461
462static void unix_gid_request(struct cache_detail *cd,
463 struct cache_head *h,
464 char **bpp, int *blen)
465{
466 char tuid[20];
467 struct unix_gid *ug = container_of(h, struct unix_gid, h);
468
469 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
470 qword_add(bpp, blen, tuid);
471 (*bpp)[-1] = '\n';
472}
473
474static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
475
476static int unix_gid_parse(struct cache_detail *cd,
477 char *mesg, int mlen)
478{
479 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
480 int id;
481 kuid_t uid;
482 int gids;
483 int rv;
484 int i;
485 int err;
486 time64_t expiry;
487 struct unix_gid ug, *ugp;
488
489 if (mesg[mlen - 1] != '\n')
490 return -EINVAL;
491 mesg[mlen-1] = 0;
492
493 rv = get_int(&mesg, &id);
494 if (rv)
495 return -EINVAL;
496 uid = make_kuid(current_user_ns(), id);
497 ug.uid = uid;
498
499 expiry = get_expiry(&mesg);
500 if (expiry == 0)
501 return -EINVAL;
502
503 rv = get_int(&mesg, &gids);
504 if (rv || gids < 0 || gids > 8192)
505 return -EINVAL;
506
507 ug.gi = groups_alloc(gids);
508 if (!ug.gi)
509 return -ENOMEM;
510
511 for (i = 0 ; i < gids ; i++) {
512 int gid;
513 kgid_t kgid;
514 rv = get_int(&mesg, &gid);
515 err = -EINVAL;
516 if (rv)
517 goto out;
518 kgid = make_kgid(current_user_ns(), gid);
519 if (!gid_valid(kgid))
520 goto out;
521 ug.gi->gid[i] = kgid;
522 }
523
524 groups_sort(ug.gi);
525 ugp = unix_gid_lookup(cd, uid);
526 if (ugp) {
527 struct cache_head *ch;
528 ug.h.flags = 0;
529 ug.h.expiry_time = expiry;
530 ch = sunrpc_cache_update(cd,
531 &ug.h, &ugp->h,
532 unix_gid_hash(uid));
533 if (!ch)
534 err = -ENOMEM;
535 else {
536 err = 0;
537 cache_put(ch, cd);
538 }
539 } else
540 err = -ENOMEM;
541 out:
542 if (ug.gi)
543 put_group_info(ug.gi);
544 return err;
545}
546
547static int unix_gid_show(struct seq_file *m,
548 struct cache_detail *cd,
549 struct cache_head *h)
550{
551 struct user_namespace *user_ns = m->file->f_cred->user_ns;
552 struct unix_gid *ug;
553 int i;
554 int glen;
555
556 if (h == NULL) {
557 seq_puts(m, "#uid cnt: gids...\n");
558 return 0;
559 }
560 ug = container_of(h, struct unix_gid, h);
561 if (test_bit(CACHE_VALID, &h->flags) &&
562 !test_bit(CACHE_NEGATIVE, &h->flags))
563 glen = ug->gi->ngroups;
564 else
565 glen = 0;
566
567 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
568 for (i = 0; i < glen; i++)
569 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
570 seq_printf(m, "\n");
571 return 0;
572}
573
574static const struct cache_detail unix_gid_cache_template = {
575 .owner = THIS_MODULE,
576 .hash_size = GID_HASHMAX,
577 .name = "auth.unix.gid",
578 .cache_put = unix_gid_put,
579 .cache_upcall = unix_gid_upcall,
580 .cache_request = unix_gid_request,
581 .cache_parse = unix_gid_parse,
582 .cache_show = unix_gid_show,
583 .match = unix_gid_match,
584 .init = unix_gid_init,
585 .update = unix_gid_update,
586 .alloc = unix_gid_alloc,
587};
588
589int unix_gid_cache_create(struct net *net)
590{
591 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
592 struct cache_detail *cd;
593 int err;
594
595 cd = cache_create_net(&unix_gid_cache_template, net);
596 if (IS_ERR(cd))
597 return PTR_ERR(cd);
598 err = cache_register_net(cd, net);
599 if (err) {
600 cache_destroy_net(cd, net);
601 return err;
602 }
603 sn->unix_gid_cache = cd;
604 return 0;
605}
606
607void unix_gid_cache_destroy(struct net *net)
608{
609 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
610 struct cache_detail *cd = sn->unix_gid_cache;
611
612 sn->unix_gid_cache = NULL;
613 cache_purge(cd);
614 cache_unregister_net(cd, net);
615 cache_destroy_net(cd, net);
616}
617
618static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
619{
620 struct unix_gid ug;
621 struct cache_head *ch;
622
623 ug.uid = uid;
624 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
625 if (ch)
626 return container_of(ch, struct unix_gid, h);
627 else
628 return NULL;
629}
630
631static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
632{
633 struct unix_gid *ug;
634 struct group_info *gi;
635 int ret;
636 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
637 sunrpc_net_id);
638
639 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
640 if (!ug)
641 return ERR_PTR(-EAGAIN);
642 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
643 switch (ret) {
644 case -ENOENT:
645 return ERR_PTR(-ENOENT);
646 case -ETIMEDOUT:
647 return ERR_PTR(-ESHUTDOWN);
648 case 0:
649 gi = get_group_info(ug->gi);
650 cache_put(&ug->h, sn->unix_gid_cache);
651 return gi;
652 default:
653 return ERR_PTR(-EAGAIN);
654 }
655}
656
657int
658svcauth_unix_set_client(struct svc_rqst *rqstp)
659{
660 struct sockaddr_in *sin;
661 struct sockaddr_in6 *sin6, sin6_storage;
662 struct ip_map *ipm;
663 struct group_info *gi;
664 struct svc_cred *cred = &rqstp->rq_cred;
665 struct svc_xprt *xprt = rqstp->rq_xprt;
666 struct net *net = xprt->xpt_net;
667 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
668
669 switch (rqstp->rq_addr.ss_family) {
670 case AF_INET:
671 sin = svc_addr_in(rqstp);
672 sin6 = &sin6_storage;
673 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
674 break;
675 case AF_INET6:
676 sin6 = svc_addr_in6(rqstp);
677 break;
678 default:
679 BUG();
680 }
681
682 rqstp->rq_client = NULL;
683 if (rqstp->rq_proc == 0)
684 return SVC_OK;
685
686 ipm = ip_map_cached_get(xprt);
687 if (ipm == NULL)
688 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
689 &sin6->sin6_addr);
690
691 if (ipm == NULL)
692 return SVC_DENIED;
693
694 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
695 default:
696 BUG();
697 case -ETIMEDOUT:
698 return SVC_CLOSE;
699 case -EAGAIN:
700 return SVC_DROP;
701 case -ENOENT:
702 return SVC_DENIED;
703 case 0:
704 rqstp->rq_client = &ipm->m_client->h;
705 kref_get(&rqstp->rq_client->ref);
706 ip_map_cached_put(xprt, ipm);
707 break;
708 }
709
710 gi = unix_gid_find(cred->cr_uid, rqstp);
711 switch (PTR_ERR(gi)) {
712 case -EAGAIN:
713 return SVC_DROP;
714 case -ESHUTDOWN:
715 return SVC_CLOSE;
716 case -ENOENT:
717 break;
718 default:
719 put_group_info(cred->cr_group_info);
720 cred->cr_group_info = gi;
721 }
722 return SVC_OK;
723}
724
725EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
726
727static int
728svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
729{
730 struct kvec *argv = &rqstp->rq_arg.head[0];
731 struct kvec *resv = &rqstp->rq_res.head[0];
732 struct svc_cred *cred = &rqstp->rq_cred;
733
734 if (argv->iov_len < 3*4)
735 return SVC_GARBAGE;
736
737 if (svc_getu32(argv) != 0) {
738 dprintk("svc: bad null cred\n");
739 *authp = rpc_autherr_badcred;
740 return SVC_DENIED;
741 }
742 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
743 dprintk("svc: bad null verf\n");
744 *authp = rpc_autherr_badverf;
745 return SVC_DENIED;
746 }
747
748 /* Signal that mapping to nobody uid/gid is required */
749 cred->cr_uid = INVALID_UID;
750 cred->cr_gid = INVALID_GID;
751 cred->cr_group_info = groups_alloc(0);
752 if (cred->cr_group_info == NULL)
753 return SVC_CLOSE; /* kmalloc failure - client must retry */
754
755 /* Put NULL verifier */
756 svc_putnl(resv, RPC_AUTH_NULL);
757 svc_putnl(resv, 0);
758
759 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
760 return SVC_OK;
761}
762
763static int
764svcauth_null_release(struct svc_rqst *rqstp)
765{
766 if (rqstp->rq_client)
767 auth_domain_put(rqstp->rq_client);
768 rqstp->rq_client = NULL;
769 if (rqstp->rq_cred.cr_group_info)
770 put_group_info(rqstp->rq_cred.cr_group_info);
771 rqstp->rq_cred.cr_group_info = NULL;
772
773 return 0; /* don't drop */
774}
775
776
777struct auth_ops svcauth_null = {
778 .name = "null",
779 .owner = THIS_MODULE,
780 .flavour = RPC_AUTH_NULL,
781 .accept = svcauth_null_accept,
782 .release = svcauth_null_release,
783 .set_client = svcauth_unix_set_client,
784};
785
786
787static int
788svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
789{
790 struct kvec *argv = &rqstp->rq_arg.head[0];
791 struct kvec *resv = &rqstp->rq_res.head[0];
792 struct svc_cred *cred = &rqstp->rq_cred;
793 struct user_namespace *userns;
794 u32 slen, i;
795 int len = argv->iov_len;
796
797 if ((len -= 3*4) < 0)
798 return SVC_GARBAGE;
799
800 svc_getu32(argv); /* length */
801 svc_getu32(argv); /* time stamp */
802 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
803 if (slen > 64 || (len -= (slen + 3)*4) < 0)
804 goto badcred;
805 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
806 argv->iov_len -= slen*4;
807 /*
808 * Note: we skip uid_valid()/gid_valid() checks here for
809 * backwards compatibility with clients that use -1 id's.
810 * Instead, -1 uid or gid is later mapped to the
811 * (export-specific) anonymous id by nfsd_setuser.
812 * Supplementary gid's will be left alone.
813 */
814 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
815 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
816 cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
817 cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
818 slen = svc_getnl(argv); /* gids length */
819 if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
820 goto badcred;
821 cred->cr_group_info = groups_alloc(slen);
822 if (cred->cr_group_info == NULL)
823 return SVC_CLOSE;
824 for (i = 0; i < slen; i++) {
825 kgid_t kgid = make_kgid(userns, svc_getnl(argv));
826 cred->cr_group_info->gid[i] = kgid;
827 }
828 groups_sort(cred->cr_group_info);
829 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
830 *authp = rpc_autherr_badverf;
831 return SVC_DENIED;
832 }
833
834 /* Put NULL verifier */
835 svc_putnl(resv, RPC_AUTH_NULL);
836 svc_putnl(resv, 0);
837
838 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
839 return SVC_OK;
840
841badcred:
842 *authp = rpc_autherr_badcred;
843 return SVC_DENIED;
844}
845
846static int
847svcauth_unix_release(struct svc_rqst *rqstp)
848{
849 /* Verifier (such as it is) is already in place.
850 */
851 if (rqstp->rq_client)
852 auth_domain_put(rqstp->rq_client);
853 rqstp->rq_client = NULL;
854 if (rqstp->rq_cred.cr_group_info)
855 put_group_info(rqstp->rq_cred.cr_group_info);
856 rqstp->rq_cred.cr_group_info = NULL;
857
858 return 0;
859}
860
861
862struct auth_ops svcauth_unix = {
863 .name = "unix",
864 .owner = THIS_MODULE,
865 .flavour = RPC_AUTH_UNIX,
866 .accept = svcauth_unix_accept,
867 .release = svcauth_unix_release,
868 .domain_release = svcauth_unix_domain_release,
869 .set_client = svcauth_unix_set_client,
870};
871
872static const struct cache_detail ip_map_cache_template = {
873 .owner = THIS_MODULE,
874 .hash_size = IP_HASHMAX,
875 .name = "auth.unix.ip",
876 .cache_put = ip_map_put,
877 .cache_upcall = ip_map_upcall,
878 .cache_request = ip_map_request,
879 .cache_parse = ip_map_parse,
880 .cache_show = ip_map_show,
881 .match = ip_map_match,
882 .init = ip_map_init,
883 .update = update,
884 .alloc = ip_map_alloc,
885};
886
887int ip_map_cache_create(struct net *net)
888{
889 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
890 struct cache_detail *cd;
891 int err;
892
893 cd = cache_create_net(&ip_map_cache_template, net);
894 if (IS_ERR(cd))
895 return PTR_ERR(cd);
896 err = cache_register_net(cd, net);
897 if (err) {
898 cache_destroy_net(cd, net);
899 return err;
900 }
901 sn->ip_map_cache = cd;
902 return 0;
903}
904
905void ip_map_cache_destroy(struct net *net)
906{
907 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
908 struct cache_detail *cd = sn->ip_map_cache;
909
910 sn->ip_map_cache = NULL;
911 cache_purge(cd);
912 cache_unregister_net(cd, net);
913 cache_destroy_net(cd, net);
914}