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TOMOYO Linux Cross Reference
Linux/net/sunrpc/svcauth_unix.c

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

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