projects / linux-2.6-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
userns: Convert group_info values from gid_t to kgid_t.
[linux-2.6-block.git] / net / sunrpc / svcauth_unix.c
... / ...
CommitLineData
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#include <linux/user_namespace.h>
18#define RPCDBG_FACILITY RPCDBG_AUTH
19
20#include <linux/sunrpc/clnt.h>
21
22#include "netns.h"
23
24/*
25 * AUTHUNIX and AUTHNULL credentials are both handled here.
26 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
27 * are always nobody (-2). i.e. we do the same IP address checks for
28 * AUTHNULL as for AUTHUNIX, and that is done here.
29 */
30
31
32struct unix_domain {
33 struct auth_domain h;
34 /* other stuff later */
35};
36
37extern struct auth_ops svcauth_null;
38extern struct auth_ops svcauth_unix;
39
40static void svcauth_unix_domain_release(struct auth_domain *dom)
41{
42 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
43
44 kfree(dom->name);
45 kfree(ud);
46}
47
48struct auth_domain *unix_domain_find(char *name)
49{
50 struct auth_domain *rv;
51 struct unix_domain *new = NULL;
52
53 rv = auth_domain_lookup(name, NULL);
54 while(1) {
55 if (rv) {
56 if (new && rv != &new->h)
57 svcauth_unix_domain_release(&new->h);
58
59 if (rv->flavour != &svcauth_unix) {
60 auth_domain_put(rv);
61 return NULL;
62 }
63 return rv;
64 }
65
66 new = kmalloc(sizeof(*new), GFP_KERNEL);
67 if (new == NULL)
68 return NULL;
69 kref_init(&new->h.ref);
70 new->h.name = kstrdup(name, GFP_KERNEL);
71 if (new->h.name == NULL) {
72 kfree(new);
73 return NULL;
74 }
75 new->h.flavour = &svcauth_unix;
76 rv = auth_domain_lookup(name, &new->h);
77 }
78}
79EXPORT_SYMBOL_GPL(unix_domain_find);
80
81
82/**************************************************
83 * cache for IP address to unix_domain
84 * as needed by AUTH_UNIX
85 */
86#define IP_HASHBITS 8
87#define IP_HASHMAX (1<<IP_HASHBITS)
88
89struct ip_map {
90 struct cache_head h;
91 char m_class[8]; /* e.g. "nfsd" */
92 struct in6_addr m_addr;
93 struct unix_domain *m_client;
94};
95
96static void ip_map_put(struct kref *kref)
97{
98 struct cache_head *item = container_of(kref, struct cache_head, ref);
99 struct ip_map *im = container_of(item, struct ip_map,h);
100
101 if (test_bit(CACHE_VALID, &item->flags) &&
102 !test_bit(CACHE_NEGATIVE, &item->flags))
103 auth_domain_put(&im->m_client->h);
104 kfree(im);
105}
106
107#if IP_HASHBITS == 8
108/* hash_long on a 64 bit machine is currently REALLY BAD for
109 * IP addresses in reverse-endian (i.e. on a little-endian machine).
110 * So use a trivial but reliable hash instead
111 */
112static inline int hash_ip(__be32 ip)
113{
114 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
115 return (hash ^ (hash>>8)) & 0xff;
116}
117#endif
118static inline int hash_ip6(struct in6_addr ip)
119{
120 return (hash_ip(ip.s6_addr32[0]) ^
121 hash_ip(ip.s6_addr32[1]) ^
122 hash_ip(ip.s6_addr32[2]) ^
123 hash_ip(ip.s6_addr32[3]));
124}
125static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
126{
127 struct ip_map *orig = container_of(corig, struct ip_map, h);
128 struct ip_map *new = container_of(cnew, struct ip_map, h);
129 return strcmp(orig->m_class, new->m_class) == 0 &&
130 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
131}
132static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
133{
134 struct ip_map *new = container_of(cnew, struct ip_map, h);
135 struct ip_map *item = container_of(citem, struct ip_map, h);
136
137 strcpy(new->m_class, item->m_class);
138 new->m_addr = item->m_addr;
139}
140static void update(struct cache_head *cnew, struct cache_head *citem)
141{
142 struct ip_map *new = container_of(cnew, struct ip_map, h);
143 struct ip_map *item = container_of(citem, struct ip_map, h);
144
145 kref_get(&item->m_client->h.ref);
146 new->m_client = item->m_client;
147}
148static struct cache_head *ip_map_alloc(void)
149{
150 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
151 if (i)
152 return &i->h;
153 else
154 return NULL;
155}
156
157static void ip_map_request(struct cache_detail *cd,
158 struct cache_head *h,
159 char **bpp, int *blen)
160{
161 char text_addr[40];
162 struct ip_map *im = container_of(h, struct ip_map, h);
163
164 if (ipv6_addr_v4mapped(&(im->m_addr))) {
165 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
166 } else {
167 snprintf(text_addr, 40, "%pI6", &im->m_addr);
168 }
169 qword_add(bpp, blen, im->m_class);
170 qword_add(bpp, blen, text_addr);
171 (*bpp)[-1] = '\n';
172}
173
174static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
175{
176 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
177}
178
179static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
180static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
181
182static int ip_map_parse(struct cache_detail *cd,
183 char *mesg, int mlen)
184{
185 /* class ipaddress [domainname] */
186 /* should be safe just to use the start of the input buffer
187 * for scratch: */
188 char *buf = mesg;
189 int len;
190 char class[8];
191 union {
192 struct sockaddr sa;
193 struct sockaddr_in s4;
194 struct sockaddr_in6 s6;
195 } address;
196 struct sockaddr_in6 sin6;
197 int err;
198
199 struct ip_map *ipmp;
200 struct auth_domain *dom;
201 time_t expiry;
202
203 if (mesg[mlen-1] != '\n')
204 return -EINVAL;
205 mesg[mlen-1] = 0;
206
207 /* class */
208 len = qword_get(&mesg, class, sizeof(class));
209 if (len <= 0) return -EINVAL;
210
211 /* ip address */
212 len = qword_get(&mesg, buf, mlen);
213 if (len <= 0) return -EINVAL;
214
215 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
216 return -EINVAL;
217 switch (address.sa.sa_family) {
218 case AF_INET:
219 /* Form a mapped IPv4 address in sin6 */
220 sin6.sin6_family = AF_INET6;
221 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
222 &sin6.sin6_addr);
223 break;
224#if IS_ENABLED(CONFIG_IPV6)
225 case AF_INET6:
226 memcpy(&sin6, &address.s6, sizeof(sin6));
227 break;
228#endif
229 default:
230 return -EINVAL;
231 }
232
233 expiry = get_expiry(&mesg);
234 if (expiry ==0)
235 return -EINVAL;
236
237 /* domainname, or empty for NEGATIVE */
238 len = qword_get(&mesg, buf, mlen);
239 if (len < 0) return -EINVAL;
240
241 if (len) {
242 dom = unix_domain_find(buf);
243 if (dom == NULL)
244 return -ENOENT;
245 } else
246 dom = NULL;
247
248 /* IPv6 scope IDs are ignored for now */
249 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
250 if (ipmp) {
251 err = __ip_map_update(cd, ipmp,
252 container_of(dom, struct unix_domain, h),
253 expiry);
254 } else
255 err = -ENOMEM;
256
257 if (dom)
258 auth_domain_put(dom);
259
260 cache_flush();
261 return err;
262}
263
264static int ip_map_show(struct seq_file *m,
265 struct cache_detail *cd,
266 struct cache_head *h)
267{
268 struct ip_map *im;
269 struct in6_addr addr;
270 char *dom = "-no-domain-";
271
272 if (h == NULL) {
273 seq_puts(m, "#class IP domain\n");
274 return 0;
275 }
276 im = container_of(h, struct ip_map, h);
277 /* class addr domain */
278 addr = im->m_addr;
279
280 if (test_bit(CACHE_VALID, &h->flags) &&
281 !test_bit(CACHE_NEGATIVE, &h->flags))
282 dom = im->m_client->h.name;
283
284 if (ipv6_addr_v4mapped(&addr)) {
285 seq_printf(m, "%s %pI4 %s\n",
286 im->m_class, &addr.s6_addr32[3], dom);
287 } else {
288 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
289 }
290 return 0;
291}
292
293
294static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
295 struct in6_addr *addr)
296{
297 struct ip_map ip;
298 struct cache_head *ch;
299
300 strcpy(ip.m_class, class);
301 ip.m_addr = *addr;
302 ch = sunrpc_cache_lookup(cd, &ip.h,
303 hash_str(class, IP_HASHBITS) ^
304 hash_ip6(*addr));
305
306 if (ch)
307 return container_of(ch, struct ip_map, h);
308 else
309 return NULL;
310}
311
312static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
313 struct in6_addr *addr)
314{
315 struct sunrpc_net *sn;
316
317 sn = net_generic(net, sunrpc_net_id);
318 return __ip_map_lookup(sn->ip_map_cache, class, addr);
319}
320
321static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
322 struct unix_domain *udom, time_t expiry)
323{
324 struct ip_map ip;
325 struct cache_head *ch;
326
327 ip.m_client = udom;
328 ip.h.flags = 0;
329 if (!udom)
330 set_bit(CACHE_NEGATIVE, &ip.h.flags);
331 ip.h.expiry_time = expiry;
332 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
333 hash_str(ipm->m_class, IP_HASHBITS) ^
334 hash_ip6(ipm->m_addr));
335 if (!ch)
336 return -ENOMEM;
337 cache_put(ch, cd);
338 return 0;
339}
340
341static inline int ip_map_update(struct net *net, struct ip_map *ipm,
342 struct unix_domain *udom, time_t expiry)
343{
344 struct sunrpc_net *sn;
345
346 sn = net_generic(net, sunrpc_net_id);
347 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
348}
349
350
351void svcauth_unix_purge(void)
352{
353 struct net *net;
354
355 for_each_net(net) {
356 struct sunrpc_net *sn;
357
358 sn = net_generic(net, sunrpc_net_id);
359 cache_purge(sn->ip_map_cache);
360 }
361}
362EXPORT_SYMBOL_GPL(svcauth_unix_purge);
363
364static inline struct ip_map *
365ip_map_cached_get(struct svc_xprt *xprt)
366{
367 struct ip_map *ipm = NULL;
368 struct sunrpc_net *sn;
369
370 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
371 spin_lock(&xprt->xpt_lock);
372 ipm = xprt->xpt_auth_cache;
373 if (ipm != NULL) {
374 if (!cache_valid(&ipm->h)) {
375 /*
376 * The entry has been invalidated since it was
377 * remembered, e.g. by a second mount from the
378 * same IP address.
379 */
380 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
381 xprt->xpt_auth_cache = NULL;
382 spin_unlock(&xprt->xpt_lock);
383 cache_put(&ipm->h, sn->ip_map_cache);
384 return NULL;
385 }
386 cache_get(&ipm->h);
387 }
388 spin_unlock(&xprt->xpt_lock);
389 }
390 return ipm;
391}
392
393static inline void
394ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
395{
396 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
397 spin_lock(&xprt->xpt_lock);
398 if (xprt->xpt_auth_cache == NULL) {
399 /* newly cached, keep the reference */
400 xprt->xpt_auth_cache = ipm;
401 ipm = NULL;
402 }
403 spin_unlock(&xprt->xpt_lock);
404 }
405 if (ipm) {
406 struct sunrpc_net *sn;
407
408 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
409 cache_put(&ipm->h, sn->ip_map_cache);
410 }
411}
412
413void
414svcauth_unix_info_release(struct svc_xprt *xpt)
415{
416 struct ip_map *ipm;
417
418 ipm = xpt->xpt_auth_cache;
419 if (ipm != NULL) {
420 struct sunrpc_net *sn;
421
422 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
423 cache_put(&ipm->h, sn->ip_map_cache);
424 }
425}
426
427/****************************************************************************
428 * auth.unix.gid cache
429 * simple cache to map a UID to a list of GIDs
430 * because AUTH_UNIX aka AUTH_SYS has a max of 16
431 */
432#define GID_HASHBITS 8
433#define GID_HASHMAX (1<<GID_HASHBITS)
434
435struct unix_gid {
436 struct cache_head h;
437 uid_t uid;
438 struct group_info *gi;
439};
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(struct cache_detail *cd, uid_t uid);
498
499static int unix_gid_parse(struct cache_detail *cd,
500 char *mesg, int mlen)
501{
502 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
503 int uid;
504 int gids;
505 int rv;
506 int i;
507 int err;
508 time_t expiry;
509 struct unix_gid ug, *ugp;
510
511 if (mesg[mlen - 1] != '\n')
512 return -EINVAL;
513 mesg[mlen-1] = 0;
514
515 rv = get_int(&mesg, &uid);
516 if (rv)
517 return -EINVAL;
518 ug.uid = uid;
519
520 expiry = get_expiry(&mesg);
521 if (expiry == 0)
522 return -EINVAL;
523
524 rv = get_int(&mesg, &gids);
525 if (rv || gids < 0 || gids > 8192)
526 return -EINVAL;
527
528 ug.gi = groups_alloc(gids);
529 if (!ug.gi)
530 return -ENOMEM;
531
532 for (i = 0 ; i < gids ; i++) {
533 int gid;
534 kgid_t kgid;
535 rv = get_int(&mesg, &gid);
536 err = -EINVAL;
537 if (rv)
538 goto out;
539 kgid = make_kgid(&init_user_ns, gid);
540 if (!gid_valid(kgid))
541 goto out;
542 GROUP_AT(ug.gi, i) = kgid;
543 }
544
545 ugp = unix_gid_lookup(cd, uid);
546 if (ugp) {
547 struct cache_head *ch;
548 ug.h.flags = 0;
549 ug.h.expiry_time = expiry;
550 ch = sunrpc_cache_update(cd,
551 &ug.h, &ugp->h,
552 hash_long(uid, GID_HASHBITS));
553 if (!ch)
554 err = -ENOMEM;
555 else {
556 err = 0;
557 cache_put(ch, cd);
558 }
559 } else
560 err = -ENOMEM;
561 out:
562 if (ug.gi)
563 put_group_info(ug.gi);
564 return err;
565}
566
567static int unix_gid_show(struct seq_file *m,
568 struct cache_detail *cd,
569 struct cache_head *h)
570{
571 struct user_namespace *user_ns = current_user_ns();
572 struct unix_gid *ug;
573 int i;
574 int glen;
575
576 if (h == NULL) {
577 seq_puts(m, "#uid cnt: gids...\n");
578 return 0;
579 }
580 ug = container_of(h, struct unix_gid, h);
581 if (test_bit(CACHE_VALID, &h->flags) &&
582 !test_bit(CACHE_NEGATIVE, &h->flags))
583 glen = ug->gi->ngroups;
584 else
585 glen = 0;
586
587 seq_printf(m, "%u %d:", ug->uid, glen);
588 for (i = 0; i < glen; i++)
589 seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
590 seq_printf(m, "\n");
591 return 0;
592}
593
594static struct cache_detail unix_gid_cache_template = {
595 .owner = THIS_MODULE,
596 .hash_size = GID_HASHMAX,
597 .name = "auth.unix.gid",
598 .cache_put = unix_gid_put,
599 .cache_upcall = unix_gid_upcall,
600 .cache_parse = unix_gid_parse,
601 .cache_show = unix_gid_show,
602 .match = unix_gid_match,
603 .init = unix_gid_init,
604 .update = unix_gid_update,
605 .alloc = unix_gid_alloc,
606};
607
608int unix_gid_cache_create(struct net *net)
609{
610 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
611 struct cache_detail *cd;
612 int err;
613
614 cd = cache_create_net(&unix_gid_cache_template, net);
615 if (IS_ERR(cd))
616 return PTR_ERR(cd);
617 err = cache_register_net(cd, net);
618 if (err) {
619 cache_destroy_net(cd, net);
620 return err;
621 }
622 sn->unix_gid_cache = cd;
623 return 0;
624}
625
626void unix_gid_cache_destroy(struct net *net)
627{
628 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
629 struct cache_detail *cd = sn->unix_gid_cache;
630
631 sn->unix_gid_cache = NULL;
632 cache_purge(cd);
633 cache_unregister_net(cd, net);
634 cache_destroy_net(cd, net);
635}
636
637static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, uid_t uid)
638{
639 struct unix_gid ug;
640 struct cache_head *ch;
641
642 ug.uid = uid;
643 ch = sunrpc_cache_lookup(cd, &ug.h, hash_long(uid, GID_HASHBITS));
644 if (ch)
645 return container_of(ch, struct unix_gid, h);
646 else
647 return NULL;
648}
649
650static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
651{
652 struct unix_gid *ug;
653 struct group_info *gi;
654 int ret;
655 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
656 sunrpc_net_id);
657
658 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
659 if (!ug)
660 return ERR_PTR(-EAGAIN);
661 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
662 switch (ret) {
663 case -ENOENT:
664 return ERR_PTR(-ENOENT);
665 case -ETIMEDOUT:
666 return ERR_PTR(-ESHUTDOWN);
667 case 0:
668 gi = get_group_info(ug->gi);
669 cache_put(&ug->h, sn->unix_gid_cache);
670 return gi;
671 default:
672 return ERR_PTR(-EAGAIN);
673 }
674}
675
676int
677svcauth_unix_set_client(struct svc_rqst *rqstp)
678{
679 struct sockaddr_in *sin;
680 struct sockaddr_in6 *sin6, sin6_storage;
681 struct ip_map *ipm;
682 struct group_info *gi;
683 struct svc_cred *cred = &rqstp->rq_cred;
684 struct svc_xprt *xprt = rqstp->rq_xprt;
685 struct net *net = xprt->xpt_net;
686 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
687
688 switch (rqstp->rq_addr.ss_family) {
689 case AF_INET:
690 sin = svc_addr_in(rqstp);
691 sin6 = &sin6_storage;
692 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
693 break;
694 case AF_INET6:
695 sin6 = svc_addr_in6(rqstp);
696 break;
697 default:
698 BUG();
699 }
700
701 rqstp->rq_client = NULL;
702 if (rqstp->rq_proc == 0)
703 return SVC_OK;
704
705 ipm = ip_map_cached_get(xprt);
706 if (ipm == NULL)
707 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
708 &sin6->sin6_addr);
709
710 if (ipm == NULL)
711 return SVC_DENIED;
712
713 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
714 default:
715 BUG();
716 case -ETIMEDOUT:
717 return SVC_CLOSE;
718 case -EAGAIN:
719 return SVC_DROP;
720 case -ENOENT:
721 return SVC_DENIED;
722 case 0:
723 rqstp->rq_client = &ipm->m_client->h;
724 kref_get(&rqstp->rq_client->ref);
725 ip_map_cached_put(xprt, ipm);
726 break;
727 }
728
729 gi = unix_gid_find(cred->cr_uid, rqstp);
730 switch (PTR_ERR(gi)) {
731 case -EAGAIN:
732 return SVC_DROP;
733 case -ESHUTDOWN:
734 return SVC_CLOSE;
735 case -ENOENT:
736 break;
737 default:
738 put_group_info(cred->cr_group_info);
739 cred->cr_group_info = gi;
740 }
741 return SVC_OK;
742}
743
744EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
745
746static int
747svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
748{
749 struct kvec *argv = &rqstp->rq_arg.head[0];
750 struct kvec *resv = &rqstp->rq_res.head[0];
751 struct svc_cred *cred = &rqstp->rq_cred;
752
753 cred->cr_group_info = NULL;
754 rqstp->rq_client = NULL;
755
756 if (argv->iov_len < 3*4)
757 return SVC_GARBAGE;
758
759 if (svc_getu32(argv) != 0) {
760 dprintk("svc: bad null cred\n");
761 *authp = rpc_autherr_badcred;
762 return SVC_DENIED;
763 }
764 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
765 dprintk("svc: bad null verf\n");
766 *authp = rpc_autherr_badverf;
767 return SVC_DENIED;
768 }
769
770 /* Signal that mapping to nobody uid/gid is required */
771 cred->cr_uid = (uid_t) -1;
772 cred->cr_gid = (gid_t) -1;
773 cred->cr_group_info = groups_alloc(0);
774 if (cred->cr_group_info == NULL)
775 return SVC_CLOSE; /* kmalloc failure - client must retry */
776
777 /* Put NULL verifier */
778 svc_putnl(resv, RPC_AUTH_NULL);
779 svc_putnl(resv, 0);
780
781 rqstp->rq_flavor = RPC_AUTH_NULL;
782 return SVC_OK;
783}
784
785static int
786svcauth_null_release(struct svc_rqst *rqstp)
787{
788 if (rqstp->rq_client)
789 auth_domain_put(rqstp->rq_client);
790 rqstp->rq_client = NULL;
791 if (rqstp->rq_cred.cr_group_info)
792 put_group_info(rqstp->rq_cred.cr_group_info);
793 rqstp->rq_cred.cr_group_info = NULL;
794
795 return 0; /* don't drop */
796}
797
798
799struct auth_ops svcauth_null = {
800 .name = "null",
801 .owner = THIS_MODULE,
802 .flavour = RPC_AUTH_NULL,
803 .accept = svcauth_null_accept,
804 .release = svcauth_null_release,
805 .set_client = svcauth_unix_set_client,
806};
807
808
809static int
810svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
811{
812 struct kvec *argv = &rqstp->rq_arg.head[0];
813 struct kvec *resv = &rqstp->rq_res.head[0];
814 struct svc_cred *cred = &rqstp->rq_cred;
815 u32 slen, i;
816 int len = argv->iov_len;
817
818 cred->cr_group_info = NULL;
819 rqstp->rq_client = NULL;
820
821 if ((len -= 3*4) < 0)
822 return SVC_GARBAGE;
823
824 svc_getu32(argv); /* length */
825 svc_getu32(argv); /* time stamp */
826 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
827 if (slen > 64 || (len -= (slen + 3)*4) < 0)
828 goto badcred;
829 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
830 argv->iov_len -= slen*4;
831
832 cred->cr_uid = svc_getnl(argv); /* uid */
833 cred->cr_gid = svc_getnl(argv); /* gid */
834 slen = svc_getnl(argv); /* gids length */
835 if (slen > 16 || (len -= (slen + 2)*4) < 0)
836 goto badcred;
837 cred->cr_group_info = groups_alloc(slen);
838 if (cred->cr_group_info == NULL)
839 return SVC_CLOSE;
840 for (i = 0; i < slen; i++) {
841 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
842 if (!gid_valid(kgid))
843 goto badcred;
844 GROUP_AT(cred->cr_group_info, i) = kgid;
845 }
846 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
847 *authp = rpc_autherr_badverf;
848 return SVC_DENIED;
849 }
850
851 /* Put NULL verifier */
852 svc_putnl(resv, RPC_AUTH_NULL);
853 svc_putnl(resv, 0);
854
855 rqstp->rq_flavor = RPC_AUTH_UNIX;
856 return SVC_OK;
857
858badcred:
859 *authp = rpc_autherr_badcred;
860 return SVC_DENIED;
861}
862
863static int
864svcauth_unix_release(struct svc_rqst *rqstp)
865{
866 /* Verifier (such as it is) is already in place.
867 */
868 if (rqstp->rq_client)
869 auth_domain_put(rqstp->rq_client);
870 rqstp->rq_client = NULL;
871 if (rqstp->rq_cred.cr_group_info)
872 put_group_info(rqstp->rq_cred.cr_group_info);
873 rqstp->rq_cred.cr_group_info = NULL;
874
875 return 0;
876}
877
878
879struct auth_ops svcauth_unix = {
880 .name = "unix",
881 .owner = THIS_MODULE,
882 .flavour = RPC_AUTH_UNIX,
883 .accept = svcauth_unix_accept,
884 .release = svcauth_unix_release,
885 .domain_release = svcauth_unix_domain_release,
886 .set_client = svcauth_unix_set_client,
887};
888
889static struct cache_detail ip_map_cache_template = {
890 .owner = THIS_MODULE,
891 .hash_size = IP_HASHMAX,
892 .name = "auth.unix.ip",
893 .cache_put = ip_map_put,
894 .cache_upcall = ip_map_upcall,
895 .cache_parse = ip_map_parse,
896 .cache_show = ip_map_show,
897 .match = ip_map_match,
898 .init = ip_map_init,
899 .update = update,
900 .alloc = ip_map_alloc,
901};
902
903int ip_map_cache_create(struct net *net)
904{
905 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
906 struct cache_detail *cd;
907 int err;
908
909 cd = cache_create_net(&ip_map_cache_template, net);
910 if (IS_ERR(cd))
911 return PTR_ERR(cd);
912 err = cache_register_net(cd, net);
913 if (err) {
914 cache_destroy_net(cd, net);
915 return err;
916 }
917 sn->ip_map_cache = cd;
918 return 0;
919}
920
921void ip_map_cache_destroy(struct net *net)
922{
923 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
924 struct cache_detail *cd = sn->ip_map_cache;
925
926 sn->ip_map_cache = NULL;
927 cache_purge(cd);
928 cache_unregister_net(cd, net);
929 cache_destroy_net(cd, net);
930}
Linux 6.x block layer and io_uring tree(s)