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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 UNX_NGROUPS
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                 ug.gi->gid[i] = kgid;
521         }
522 
523         groups_sort(ug.gi);
524         ugp = unix_gid_lookup(cd, uid);
525         if (ugp) {
526                 struct cache_head *ch;
527                 ug.h.flags = 0;
528                 ug.h.expiry_time = expiry;
529                 ch = sunrpc_cache_update(cd,
530                                          &ug.h, &ugp->h,
531                                          unix_gid_hash(uid));
532                 if (!ch)
533                         err = -ENOMEM;
534                 else {
535                         err = 0;
536                         cache_put(ch, cd);
537                 }
538         } else
539                 err = -ENOMEM;
540  out:
541         if (ug.gi)
542                 put_group_info(ug.gi);
543         return err;
544 }
545 
546 static int unix_gid_show(struct seq_file *m,
547                          struct cache_detail *cd,
548                          struct cache_head *h)
549 {
550         struct user_namespace *user_ns = &init_user_ns;
551         struct unix_gid *ug;
552         int i;
553         int glen;
554 
555         if (h == NULL) {
556                 seq_puts(m, "#uid cnt: gids...\n");
557                 return 0;
558         }
559         ug = container_of(h, struct unix_gid, h);
560         if (test_bit(CACHE_VALID, &h->flags) &&
561             !test_bit(CACHE_NEGATIVE, &h->flags))
562                 glen = ug->gi->ngroups;
563         else
564                 glen = 0;
565 
566         seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
567         for (i = 0; i < glen; i++)
568                 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
569         seq_printf(m, "\n");
570         return 0;
571 }
572 
573 static const struct cache_detail unix_gid_cache_template = {
574         .owner          = THIS_MODULE,
575         .hash_size      = GID_HASHMAX,
576         .name           = "auth.unix.gid",
577         .cache_put      = unix_gid_put,
578         .cache_request  = unix_gid_request,
579         .cache_parse    = unix_gid_parse,
580         .cache_show     = unix_gid_show,
581         .match          = unix_gid_match,
582         .init           = unix_gid_init,
583         .update         = unix_gid_update,
584         .alloc          = unix_gid_alloc,
585 };
586 
587 int unix_gid_cache_create(struct net *net)
588 {
589         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
590         struct cache_detail *cd;
591         int err;
592 
593         cd = cache_create_net(&unix_gid_cache_template, net);
594         if (IS_ERR(cd))
595                 return PTR_ERR(cd);
596         err = cache_register_net(cd, net);
597         if (err) {
598                 cache_destroy_net(cd, net);
599                 return err;
600         }
601         sn->unix_gid_cache = cd;
602         return 0;
603 }
604 
605 void unix_gid_cache_destroy(struct net *net)
606 {
607         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
608         struct cache_detail *cd = sn->unix_gid_cache;
609 
610         sn->unix_gid_cache = NULL;
611         cache_purge(cd);
612         cache_unregister_net(cd, net);
613         cache_destroy_net(cd, net);
614 }
615 
616 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
617 {
618         struct unix_gid ug;
619         struct cache_head *ch;
620 
621         ug.uid = uid;
622         ch = sunrpc_cache_lookup(cd, &ug.h, unix_gid_hash(uid));
623         if (ch)
624                 return container_of(ch, struct unix_gid, h);
625         else
626                 return NULL;
627 }
628 
629 static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
630 {
631         struct unix_gid *ug;
632         struct group_info *gi;
633         int ret;
634         struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
635                                             sunrpc_net_id);
636 
637         ug = unix_gid_lookup(sn->unix_gid_cache, uid);
638         if (!ug)
639                 return ERR_PTR(-EAGAIN);
640         ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
641         switch (ret) {
642         case -ENOENT:
643                 return ERR_PTR(-ENOENT);
644         case -ETIMEDOUT:
645                 return ERR_PTR(-ESHUTDOWN);
646         case 0:
647                 gi = get_group_info(ug->gi);
648                 cache_put(&ug->h, sn->unix_gid_cache);
649                 return gi;
650         default:
651                 return ERR_PTR(-EAGAIN);
652         }
653 }
654 
655 int
656 svcauth_unix_set_client(struct svc_rqst *rqstp)
657 {
658         struct sockaddr_in *sin;
659         struct sockaddr_in6 *sin6, sin6_storage;
660         struct ip_map *ipm;
661         struct group_info *gi;
662         struct svc_cred *cred = &rqstp->rq_cred;
663         struct svc_xprt *xprt = rqstp->rq_xprt;
664         struct net *net = xprt->xpt_net;
665         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
666 
667         switch (rqstp->rq_addr.ss_family) {
668         case AF_INET:
669                 sin = svc_addr_in(rqstp);
670                 sin6 = &sin6_storage;
671                 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
672                 break;
673         case AF_INET6:
674                 sin6 = svc_addr_in6(rqstp);
675                 break;
676         default:
677                 BUG();
678         }
679 
680         rqstp->rq_client = NULL;
681         if (rqstp->rq_proc == 0)
682                 return SVC_OK;
683 
684         ipm = ip_map_cached_get(xprt);
685         if (ipm == NULL)
686                 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
687                                     &sin6->sin6_addr);
688 
689         if (ipm == NULL)
690                 return SVC_DENIED;
691 
692         switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
693                 default:
694                         BUG();
695                 case -ETIMEDOUT:
696                         return SVC_CLOSE;
697                 case -EAGAIN:
698                         return SVC_DROP;
699                 case -ENOENT:
700                         return SVC_DENIED;
701                 case 0:
702                         rqstp->rq_client = &ipm->m_client->h;
703                         kref_get(&rqstp->rq_client->ref);
704                         ip_map_cached_put(xprt, ipm);
705                         break;
706         }
707 
708         gi = unix_gid_find(cred->cr_uid, rqstp);
709         switch (PTR_ERR(gi)) {
710         case -EAGAIN:
711                 return SVC_DROP;
712         case -ESHUTDOWN:
713                 return SVC_CLOSE;
714         case -ENOENT:
715                 break;
716         default:
717                 put_group_info(cred->cr_group_info);
718                 cred->cr_group_info = gi;
719         }
720         return SVC_OK;
721 }
722 
723 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
724 
725 static int
726 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
727 {
728         struct kvec     *argv = &rqstp->rq_arg.head[0];
729         struct kvec     *resv = &rqstp->rq_res.head[0];
730         struct svc_cred *cred = &rqstp->rq_cred;
731 
732         if (argv->iov_len < 3*4)
733                 return SVC_GARBAGE;
734 
735         if (svc_getu32(argv) != 0) {
736                 dprintk("svc: bad null cred\n");
737                 *authp = rpc_autherr_badcred;
738                 return SVC_DENIED;
739         }
740         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
741                 dprintk("svc: bad null verf\n");
742                 *authp = rpc_autherr_badverf;
743                 return SVC_DENIED;
744         }
745 
746         /* Signal that mapping to nobody uid/gid is required */
747         cred->cr_uid = INVALID_UID;
748         cred->cr_gid = INVALID_GID;
749         cred->cr_group_info = groups_alloc(0);
750         if (cred->cr_group_info == NULL)
751                 return SVC_CLOSE; /* kmalloc failure - client must retry */
752 
753         /* Put NULL verifier */
754         svc_putnl(resv, RPC_AUTH_NULL);
755         svc_putnl(resv, 0);
756 
757         rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
758         return SVC_OK;
759 }
760 
761 static int
762 svcauth_null_release(struct svc_rqst *rqstp)
763 {
764         if (rqstp->rq_client)
765                 auth_domain_put(rqstp->rq_client);
766         rqstp->rq_client = NULL;
767         if (rqstp->rq_cred.cr_group_info)
768                 put_group_info(rqstp->rq_cred.cr_group_info);
769         rqstp->rq_cred.cr_group_info = NULL;
770 
771         return 0; /* don't drop */
772 }
773 
774 
775 struct auth_ops svcauth_null = {
776         .name           = "null",
777         .owner          = THIS_MODULE,
778         .flavour        = RPC_AUTH_NULL,
779         .accept         = svcauth_null_accept,
780         .release        = svcauth_null_release,
781         .set_client     = svcauth_unix_set_client,
782 };
783 
784 
785 static int
786 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
787 {
788         struct kvec     *argv = &rqstp->rq_arg.head[0];
789         struct kvec     *resv = &rqstp->rq_res.head[0];
790         struct svc_cred *cred = &rqstp->rq_cred;
791         u32             slen, i;
792         int             len   = argv->iov_len;
793 
794         if ((len -= 3*4) < 0)
795                 return SVC_GARBAGE;
796 
797         svc_getu32(argv);                       /* length */
798         svc_getu32(argv);                       /* time stamp */
799         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
800         if (slen > 64 || (len -= (slen + 3)*4) < 0)
801                 goto badcred;
802         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
803         argv->iov_len -= slen*4;
804         /*
805          * Note: we skip uid_valid()/gid_valid() checks here for
806          * backwards compatibility with clients that use -1 id's.
807          * Instead, -1 uid or gid is later mapped to the
808          * (export-specific) anonymous id by nfsd_setuser.
809          * Supplementary gid's will be left alone.
810          */
811         cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
812         cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
813         slen = svc_getnl(argv);                 /* gids length */
814         if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
815                 goto badcred;
816         cred->cr_group_info = groups_alloc(slen);
817         if (cred->cr_group_info == NULL)
818                 return SVC_CLOSE;
819         for (i = 0; i < slen; i++) {
820                 kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
821                 cred->cr_group_info->gid[i] = kgid;
822         }
823         groups_sort(cred->cr_group_info);
824         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
825                 *authp = rpc_autherr_badverf;
826                 return SVC_DENIED;
827         }
828 
829         /* Put NULL verifier */
830         svc_putnl(resv, RPC_AUTH_NULL);
831         svc_putnl(resv, 0);
832 
833         rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
834         return SVC_OK;
835 
836 badcred:
837         *authp = rpc_autherr_badcred;
838         return SVC_DENIED;
839 }
840 
841 static int
842 svcauth_unix_release(struct svc_rqst *rqstp)
843 {
844         /* Verifier (such as it is) is already in place.
845          */
846         if (rqstp->rq_client)
847                 auth_domain_put(rqstp->rq_client);
848         rqstp->rq_client = NULL;
849         if (rqstp->rq_cred.cr_group_info)
850                 put_group_info(rqstp->rq_cred.cr_group_info);
851         rqstp->rq_cred.cr_group_info = NULL;
852 
853         return 0;
854 }
855 
856 
857 struct auth_ops svcauth_unix = {
858         .name           = "unix",
859         .owner          = THIS_MODULE,
860         .flavour        = RPC_AUTH_UNIX,
861         .accept         = svcauth_unix_accept,
862         .release        = svcauth_unix_release,
863         .domain_release = svcauth_unix_domain_release,
864         .set_client     = svcauth_unix_set_client,
865 };
866 
867 static const struct cache_detail ip_map_cache_template = {
868         .owner          = THIS_MODULE,
869         .hash_size      = IP_HASHMAX,
870         .name           = "auth.unix.ip",
871         .cache_put      = ip_map_put,
872         .cache_request  = ip_map_request,
873         .cache_parse    = ip_map_parse,
874         .cache_show     = ip_map_show,
875         .match          = ip_map_match,
876         .init           = ip_map_init,
877         .update         = update,
878         .alloc          = ip_map_alloc,
879 };
880 
881 int ip_map_cache_create(struct net *net)
882 {
883         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
884         struct cache_detail *cd;
885         int err;
886 
887         cd = cache_create_net(&ip_map_cache_template, net);
888         if (IS_ERR(cd))
889                 return PTR_ERR(cd);
890         err = cache_register_net(cd, net);
891         if (err) {
892                 cache_destroy_net(cd, net);
893                 return err;
894         }
895         sn->ip_map_cache = cd;
896         return 0;
897 }
898 
899 void ip_map_cache_destroy(struct net *net)
900 {
901         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
902         struct cache_detail *cd = sn->ip_map_cache;
903 
904         sn->ip_map_cache = NULL;
905         cache_purge(cd);
906         cache_unregister_net(cd, net);
907         cache_destroy_net(cd, net);
908 }
909 

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