knfsd: don't bother mapping putrootfh enoent to eperm
[linux-2.6] / net / sunrpc / svcauth_unix.c
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 <net/sock.h>
14
15 #define RPCDBG_FACILITY RPCDBG_AUTH
16
17
18 /*
19  * AUTHUNIX and AUTHNULL credentials are both handled here.
20  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
21  * are always nobody (-2).  i.e. we do the same IP address checks for
22  * AUTHNULL as for AUTHUNIX, and that is done here.
23  */
24
25
26 struct unix_domain {
27         struct auth_domain      h;
28         int     addr_changes;
29         /* other stuff later */
30 };
31
32 extern struct auth_ops svcauth_unix;
33
34 struct auth_domain *unix_domain_find(char *name)
35 {
36         struct auth_domain *rv;
37         struct unix_domain *new = NULL;
38
39         rv = auth_domain_lookup(name, NULL);
40         while(1) {
41                 if (rv) {
42                         if (new && rv != &new->h)
43                                 auth_domain_put(&new->h);
44
45                         if (rv->flavour != &svcauth_unix) {
46                                 auth_domain_put(rv);
47                                 return NULL;
48                         }
49                         return rv;
50                 }
51
52                 new = kmalloc(sizeof(*new), GFP_KERNEL);
53                 if (new == NULL)
54                         return NULL;
55                 kref_init(&new->h.ref);
56                 new->h.name = kstrdup(name, GFP_KERNEL);
57                 if (new->h.name == NULL) {
58                         kfree(new);
59                         return NULL;
60                 }
61                 new->h.flavour = &svcauth_unix;
62                 new->addr_changes = 0;
63                 rv = auth_domain_lookup(name, &new->h);
64         }
65 }
66
67 static void svcauth_unix_domain_release(struct auth_domain *dom)
68 {
69         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
70
71         kfree(dom->name);
72         kfree(ud);
73 }
74
75
76 /**************************************************
77  * cache for IP address to unix_domain
78  * as needed by AUTH_UNIX
79  */
80 #define IP_HASHBITS     8
81 #define IP_HASHMAX      (1<<IP_HASHBITS)
82 #define IP_HASHMASK     (IP_HASHMAX-1)
83
84 struct ip_map {
85         struct cache_head       h;
86         char                    m_class[8]; /* e.g. "nfsd" */
87         struct in_addr          m_addr;
88         struct unix_domain      *m_client;
89         int                     m_add_change;
90 };
91 static struct cache_head        *ip_table[IP_HASHMAX];
92
93 static void ip_map_put(struct kref *kref)
94 {
95         struct cache_head *item = container_of(kref, struct cache_head, ref);
96         struct ip_map *im = container_of(item, struct ip_map,h);
97
98         if (test_bit(CACHE_VALID, &item->flags) &&
99             !test_bit(CACHE_NEGATIVE, &item->flags))
100                 auth_domain_put(&im->m_client->h);
101         kfree(im);
102 }
103
104 #if IP_HASHBITS == 8
105 /* hash_long on a 64 bit machine is currently REALLY BAD for
106  * IP addresses in reverse-endian (i.e. on a little-endian machine).
107  * So use a trivial but reliable hash instead
108  */
109 static inline int hash_ip(__be32 ip)
110 {
111         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
112         return (hash ^ (hash>>8)) & 0xff;
113 }
114 #endif
115 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
116 {
117         struct ip_map *orig = container_of(corig, struct ip_map, h);
118         struct ip_map *new = container_of(cnew, struct ip_map, h);
119         return strcmp(orig->m_class, new->m_class) == 0
120                 && orig->m_addr.s_addr == new->m_addr.s_addr;
121 }
122 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
123 {
124         struct ip_map *new = container_of(cnew, struct ip_map, h);
125         struct ip_map *item = container_of(citem, struct ip_map, h);
126
127         strcpy(new->m_class, item->m_class);
128         new->m_addr.s_addr = item->m_addr.s_addr;
129 }
130 static void update(struct cache_head *cnew, struct cache_head *citem)
131 {
132         struct ip_map *new = container_of(cnew, struct ip_map, h);
133         struct ip_map *item = container_of(citem, struct ip_map, h);
134
135         kref_get(&item->m_client->h.ref);
136         new->m_client = item->m_client;
137         new->m_add_change = item->m_add_change;
138 }
139 static struct cache_head *ip_map_alloc(void)
140 {
141         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
142         if (i)
143                 return &i->h;
144         else
145                 return NULL;
146 }
147
148 static void ip_map_request(struct cache_detail *cd,
149                                   struct cache_head *h,
150                                   char **bpp, int *blen)
151 {
152         char text_addr[20];
153         struct ip_map *im = container_of(h, struct ip_map, h);
154         __be32 addr = im->m_addr.s_addr;
155
156         snprintf(text_addr, 20, "%u.%u.%u.%u",
157                  ntohl(addr) >> 24 & 0xff,
158                  ntohl(addr) >> 16 & 0xff,
159                  ntohl(addr) >>  8 & 0xff,
160                  ntohl(addr) >>  0 & 0xff);
161
162         qword_add(bpp, blen, im->m_class);
163         qword_add(bpp, blen, text_addr);
164         (*bpp)[-1] = '\n';
165 }
166
167 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
168 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
169
170 static int ip_map_parse(struct cache_detail *cd,
171                           char *mesg, int mlen)
172 {
173         /* class ipaddress [domainname] */
174         /* should be safe just to use the start of the input buffer
175          * for scratch: */
176         char *buf = mesg;
177         int len;
178         int b1,b2,b3,b4;
179         char c;
180         char class[8];
181         struct in_addr addr;
182         int err;
183
184         struct ip_map *ipmp;
185         struct auth_domain *dom;
186         time_t expiry;
187
188         if (mesg[mlen-1] != '\n')
189                 return -EINVAL;
190         mesg[mlen-1] = 0;
191
192         /* class */
193         len = qword_get(&mesg, class, sizeof(class));
194         if (len <= 0) return -EINVAL;
195
196         /* ip address */
197         len = qword_get(&mesg, buf, mlen);
198         if (len <= 0) return -EINVAL;
199
200         if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
201                 return -EINVAL;
202
203         expiry = get_expiry(&mesg);
204         if (expiry ==0)
205                 return -EINVAL;
206
207         /* domainname, or empty for NEGATIVE */
208         len = qword_get(&mesg, buf, mlen);
209         if (len < 0) return -EINVAL;
210
211         if (len) {
212                 dom = unix_domain_find(buf);
213                 if (dom == NULL)
214                         return -ENOENT;
215         } else
216                 dom = NULL;
217
218         addr.s_addr =
219                 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
220
221         ipmp = ip_map_lookup(class,addr);
222         if (ipmp) {
223                 err = ip_map_update(ipmp,
224                              container_of(dom, struct unix_domain, h),
225                              expiry);
226         } else
227                 err = -ENOMEM;
228
229         if (dom)
230                 auth_domain_put(dom);
231
232         cache_flush();
233         return err;
234 }
235
236 static int ip_map_show(struct seq_file *m,
237                        struct cache_detail *cd,
238                        struct cache_head *h)
239 {
240         struct ip_map *im;
241         struct in_addr addr;
242         char *dom = "-no-domain-";
243
244         if (h == NULL) {
245                 seq_puts(m, "#class IP domain\n");
246                 return 0;
247         }
248         im = container_of(h, struct ip_map, h);
249         /* class addr domain */
250         addr = im->m_addr;
251
252         if (test_bit(CACHE_VALID, &h->flags) &&
253             !test_bit(CACHE_NEGATIVE, &h->flags))
254                 dom = im->m_client->h.name;
255
256         seq_printf(m, "%s %d.%d.%d.%d %s\n",
257                    im->m_class,
258                    ntohl(addr.s_addr) >> 24 & 0xff,
259                    ntohl(addr.s_addr) >> 16 & 0xff,
260                    ntohl(addr.s_addr) >>  8 & 0xff,
261                    ntohl(addr.s_addr) >>  0 & 0xff,
262                    dom
263                    );
264         return 0;
265 }
266
267
268 struct cache_detail ip_map_cache = {
269         .owner          = THIS_MODULE,
270         .hash_size      = IP_HASHMAX,
271         .hash_table     = ip_table,
272         .name           = "auth.unix.ip",
273         .cache_put      = ip_map_put,
274         .cache_request  = ip_map_request,
275         .cache_parse    = ip_map_parse,
276         .cache_show     = ip_map_show,
277         .match          = ip_map_match,
278         .init           = ip_map_init,
279         .update         = update,
280         .alloc          = ip_map_alloc,
281 };
282
283 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
284 {
285         struct ip_map ip;
286         struct cache_head *ch;
287
288         strcpy(ip.m_class, class);
289         ip.m_addr = addr;
290         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
291                                  hash_str(class, IP_HASHBITS) ^
292                                  hash_ip(addr.s_addr));
293
294         if (ch)
295                 return container_of(ch, struct ip_map, h);
296         else
297                 return NULL;
298 }
299
300 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
301 {
302         struct ip_map ip;
303         struct cache_head *ch;
304
305         ip.m_client = udom;
306         ip.h.flags = 0;
307         if (!udom)
308                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
309         else {
310                 ip.m_add_change = udom->addr_changes;
311                 /* if this is from the legacy set_client system call,
312                  * we need m_add_change to be one higher
313                  */
314                 if (expiry == NEVER)
315                         ip.m_add_change++;
316         }
317         ip.h.expiry_time = expiry;
318         ch = sunrpc_cache_update(&ip_map_cache,
319                                  &ip.h, &ipm->h,
320                                  hash_str(ipm->m_class, IP_HASHBITS) ^
321                                  hash_ip(ipm->m_addr.s_addr));
322         if (!ch)
323                 return -ENOMEM;
324         cache_put(ch, &ip_map_cache);
325         return 0;
326 }
327
328 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
329 {
330         struct unix_domain *udom;
331         struct ip_map *ipmp;
332
333         if (dom->flavour != &svcauth_unix)
334                 return -EINVAL;
335         udom = container_of(dom, struct unix_domain, h);
336         ipmp = ip_map_lookup("nfsd", addr);
337
338         if (ipmp)
339                 return ip_map_update(ipmp, udom, NEVER);
340         else
341                 return -ENOMEM;
342 }
343
344 int auth_unix_forget_old(struct auth_domain *dom)
345 {
346         struct unix_domain *udom;
347
348         if (dom->flavour != &svcauth_unix)
349                 return -EINVAL;
350         udom = container_of(dom, struct unix_domain, h);
351         udom->addr_changes++;
352         return 0;
353 }
354
355 struct auth_domain *auth_unix_lookup(struct in_addr addr)
356 {
357         struct ip_map *ipm;
358         struct auth_domain *rv;
359
360         ipm = ip_map_lookup("nfsd", addr);
361
362         if (!ipm)
363                 return NULL;
364         if (cache_check(&ip_map_cache, &ipm->h, NULL))
365                 return NULL;
366
367         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
368                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
369                         auth_domain_put(&ipm->m_client->h);
370                 rv = NULL;
371         } else {
372                 rv = &ipm->m_client->h;
373                 kref_get(&rv->ref);
374         }
375         cache_put(&ipm->h, &ip_map_cache);
376         return rv;
377 }
378
379 void svcauth_unix_purge(void)
380 {
381         cache_purge(&ip_map_cache);
382 }
383
384 static inline struct ip_map *
385 ip_map_cached_get(struct svc_rqst *rqstp)
386 {
387         struct ip_map *ipm = NULL;
388         struct svc_xprt *xprt = rqstp->rq_xprt;
389
390         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
391                 spin_lock(&xprt->xpt_lock);
392                 ipm = xprt->xpt_auth_cache;
393                 if (ipm != NULL) {
394                         if (!cache_valid(&ipm->h)) {
395                                 /*
396                                  * The entry has been invalidated since it was
397                                  * remembered, e.g. by a second mount from the
398                                  * same IP address.
399                                  */
400                                 xprt->xpt_auth_cache = NULL;
401                                 spin_unlock(&xprt->xpt_lock);
402                                 cache_put(&ipm->h, &ip_map_cache);
403                                 return NULL;
404                         }
405                         cache_get(&ipm->h);
406                 }
407                 spin_unlock(&xprt->xpt_lock);
408         }
409         return ipm;
410 }
411
412 static inline void
413 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
414 {
415         struct svc_xprt *xprt = rqstp->rq_xprt;
416
417         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
418                 spin_lock(&xprt->xpt_lock);
419                 if (xprt->xpt_auth_cache == NULL) {
420                         /* newly cached, keep the reference */
421                         xprt->xpt_auth_cache = ipm;
422                         ipm = NULL;
423                 }
424                 spin_unlock(&xprt->xpt_lock);
425         }
426         if (ipm)
427                 cache_put(&ipm->h, &ip_map_cache);
428 }
429
430 void
431 svcauth_unix_info_release(void *info)
432 {
433         struct ip_map *ipm = info;
434         cache_put(&ipm->h, &ip_map_cache);
435 }
436
437 /****************************************************************************
438  * auth.unix.gid cache
439  * simple cache to map a UID to a list of GIDs
440  * because AUTH_UNIX aka AUTH_SYS has a max of 16
441  */
442 #define GID_HASHBITS    8
443 #define GID_HASHMAX     (1<<GID_HASHBITS)
444 #define GID_HASHMASK    (GID_HASHMAX - 1)
445
446 struct unix_gid {
447         struct cache_head       h;
448         uid_t                   uid;
449         struct group_info       *gi;
450 };
451 static struct cache_head        *gid_table[GID_HASHMAX];
452
453 static void unix_gid_put(struct kref *kref)
454 {
455         struct cache_head *item = container_of(kref, struct cache_head, ref);
456         struct unix_gid *ug = container_of(item, struct unix_gid, h);
457         if (test_bit(CACHE_VALID, &item->flags) &&
458             !test_bit(CACHE_NEGATIVE, &item->flags))
459                 put_group_info(ug->gi);
460         kfree(ug);
461 }
462
463 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
464 {
465         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
466         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
467         return orig->uid == new->uid;
468 }
469 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
470 {
471         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
472         struct unix_gid *item = container_of(citem, struct unix_gid, h);
473         new->uid = item->uid;
474 }
475 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
476 {
477         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
478         struct unix_gid *item = container_of(citem, struct unix_gid, h);
479
480         get_group_info(item->gi);
481         new->gi = item->gi;
482 }
483 static struct cache_head *unix_gid_alloc(void)
484 {
485         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
486         if (g)
487                 return &g->h;
488         else
489                 return NULL;
490 }
491
492 static void unix_gid_request(struct cache_detail *cd,
493                              struct cache_head *h,
494                              char **bpp, int *blen)
495 {
496         char tuid[20];
497         struct unix_gid *ug = container_of(h, struct unix_gid, h);
498
499         snprintf(tuid, 20, "%u", ug->uid);
500         qword_add(bpp, blen, tuid);
501         (*bpp)[-1] = '\n';
502 }
503
504 static struct unix_gid *unix_gid_lookup(uid_t uid);
505 extern struct cache_detail unix_gid_cache;
506
507 static int unix_gid_parse(struct cache_detail *cd,
508                         char *mesg, int mlen)
509 {
510         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
511         int uid;
512         int gids;
513         int rv;
514         int i;
515         int err;
516         time_t expiry;
517         struct unix_gid ug, *ugp;
518
519         if (mlen <= 0 || mesg[mlen-1] != '\n')
520                 return -EINVAL;
521         mesg[mlen-1] = 0;
522
523         rv = get_int(&mesg, &uid);
524         if (rv)
525                 return -EINVAL;
526         ug.uid = uid;
527
528         expiry = get_expiry(&mesg);
529         if (expiry == 0)
530                 return -EINVAL;
531
532         rv = get_int(&mesg, &gids);
533         if (rv || gids < 0 || gids > 8192)
534                 return -EINVAL;
535
536         ug.gi = groups_alloc(gids);
537         if (!ug.gi)
538                 return -ENOMEM;
539
540         for (i = 0 ; i < gids ; i++) {
541                 int gid;
542                 rv = get_int(&mesg, &gid);
543                 err = -EINVAL;
544                 if (rv)
545                         goto out;
546                 GROUP_AT(ug.gi, i) = gid;
547         }
548
549         ugp = unix_gid_lookup(uid);
550         if (ugp) {
551                 struct cache_head *ch;
552                 ug.h.flags = 0;
553                 ug.h.expiry_time = expiry;
554                 ch = sunrpc_cache_update(&unix_gid_cache,
555                                          &ug.h, &ugp->h,
556                                          hash_long(uid, GID_HASHBITS));
557                 if (!ch)
558                         err = -ENOMEM;
559                 else {
560                         err = 0;
561                         cache_put(ch, &unix_gid_cache);
562                 }
563         } else
564                 err = -ENOMEM;
565  out:
566         if (ug.gi)
567                 put_group_info(ug.gi);
568         return err;
569 }
570
571 static int unix_gid_show(struct seq_file *m,
572                          struct cache_detail *cd,
573                          struct cache_head *h)
574 {
575         struct unix_gid *ug;
576         int i;
577         int glen;
578
579         if (h == NULL) {
580                 seq_puts(m, "#uid cnt: gids...\n");
581                 return 0;
582         }
583         ug = container_of(h, struct unix_gid, h);
584         if (test_bit(CACHE_VALID, &h->flags) &&
585             !test_bit(CACHE_NEGATIVE, &h->flags))
586                 glen = ug->gi->ngroups;
587         else
588                 glen = 0;
589
590         seq_printf(m, "%d %d:", ug->uid, glen);
591         for (i = 0; i < glen; i++)
592                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
593         seq_printf(m, "\n");
594         return 0;
595 }
596
597 struct cache_detail unix_gid_cache = {
598         .owner          = THIS_MODULE,
599         .hash_size      = GID_HASHMAX,
600         .hash_table     = gid_table,
601         .name           = "auth.unix.gid",
602         .cache_put      = unix_gid_put,
603         .cache_request  = unix_gid_request,
604         .cache_parse    = unix_gid_parse,
605         .cache_show     = unix_gid_show,
606         .match          = unix_gid_match,
607         .init           = unix_gid_init,
608         .update         = unix_gid_update,
609         .alloc          = unix_gid_alloc,
610 };
611
612 static struct unix_gid *unix_gid_lookup(uid_t uid)
613 {
614         struct unix_gid ug;
615         struct cache_head *ch;
616
617         ug.uid = uid;
618         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
619                                  hash_long(uid, GID_HASHBITS));
620         if (ch)
621                 return container_of(ch, struct unix_gid, h);
622         else
623                 return NULL;
624 }
625
626 static int unix_gid_find(uid_t uid, struct group_info **gip,
627                          struct svc_rqst *rqstp)
628 {
629         struct unix_gid *ug = unix_gid_lookup(uid);
630         if (!ug)
631                 return -EAGAIN;
632         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
633         case -ENOENT:
634                 *gip = NULL;
635                 return 0;
636         case 0:
637                 *gip = ug->gi;
638                 get_group_info(*gip);
639                 return 0;
640         default:
641                 return -EAGAIN;
642         }
643 }
644
645 int
646 svcauth_unix_set_client(struct svc_rqst *rqstp)
647 {
648         struct sockaddr_in *sin = svc_addr_in(rqstp);
649         struct ip_map *ipm;
650
651         rqstp->rq_client = NULL;
652         if (rqstp->rq_proc == 0)
653                 return SVC_OK;
654
655         ipm = ip_map_cached_get(rqstp);
656         if (ipm == NULL)
657                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
658                                     sin->sin_addr);
659
660         if (ipm == NULL)
661                 return SVC_DENIED;
662
663         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
664                 default:
665                         BUG();
666                 case -EAGAIN:
667                 case -ETIMEDOUT:
668                         return SVC_DROP;
669                 case -ENOENT:
670                         return SVC_DENIED;
671                 case 0:
672                         rqstp->rq_client = &ipm->m_client->h;
673                         kref_get(&rqstp->rq_client->ref);
674                         ip_map_cached_put(rqstp, ipm);
675                         break;
676         }
677         return SVC_OK;
678 }
679
680 EXPORT_SYMBOL(svcauth_unix_set_client);
681
682 static int
683 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
684 {
685         struct kvec     *argv = &rqstp->rq_arg.head[0];
686         struct kvec     *resv = &rqstp->rq_res.head[0];
687         struct svc_cred *cred = &rqstp->rq_cred;
688
689         cred->cr_group_info = NULL;
690         rqstp->rq_client = NULL;
691
692         if (argv->iov_len < 3*4)
693                 return SVC_GARBAGE;
694
695         if (svc_getu32(argv) != 0) {
696                 dprintk("svc: bad null cred\n");
697                 *authp = rpc_autherr_badcred;
698                 return SVC_DENIED;
699         }
700         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
701                 dprintk("svc: bad null verf\n");
702                 *authp = rpc_autherr_badverf;
703                 return SVC_DENIED;
704         }
705
706         /* Signal that mapping to nobody uid/gid is required */
707         cred->cr_uid = (uid_t) -1;
708         cred->cr_gid = (gid_t) -1;
709         cred->cr_group_info = groups_alloc(0);
710         if (cred->cr_group_info == NULL)
711                 return SVC_DROP; /* kmalloc failure - client must retry */
712
713         /* Put NULL verifier */
714         svc_putnl(resv, RPC_AUTH_NULL);
715         svc_putnl(resv, 0);
716
717         rqstp->rq_flavor = RPC_AUTH_NULL;
718         return SVC_OK;
719 }
720
721 static int
722 svcauth_null_release(struct svc_rqst *rqstp)
723 {
724         if (rqstp->rq_client)
725                 auth_domain_put(rqstp->rq_client);
726         rqstp->rq_client = NULL;
727         if (rqstp->rq_cred.cr_group_info)
728                 put_group_info(rqstp->rq_cred.cr_group_info);
729         rqstp->rq_cred.cr_group_info = NULL;
730
731         return 0; /* don't drop */
732 }
733
734
735 struct auth_ops svcauth_null = {
736         .name           = "null",
737         .owner          = THIS_MODULE,
738         .flavour        = RPC_AUTH_NULL,
739         .accept         = svcauth_null_accept,
740         .release        = svcauth_null_release,
741         .set_client     = svcauth_unix_set_client,
742 };
743
744
745 static int
746 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
747 {
748         struct kvec     *argv = &rqstp->rq_arg.head[0];
749         struct kvec     *resv = &rqstp->rq_res.head[0];
750         struct svc_cred *cred = &rqstp->rq_cred;
751         u32             slen, i;
752         int             len   = argv->iov_len;
753
754         cred->cr_group_info = NULL;
755         rqstp->rq_client = NULL;
756
757         if ((len -= 3*4) < 0)
758                 return SVC_GARBAGE;
759
760         svc_getu32(argv);                       /* length */
761         svc_getu32(argv);                       /* time stamp */
762         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
763         if (slen > 64 || (len -= (slen + 3)*4) < 0)
764                 goto badcred;
765         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
766         argv->iov_len -= slen*4;
767
768         cred->cr_uid = svc_getnl(argv);         /* uid */
769         cred->cr_gid = svc_getnl(argv);         /* gid */
770         slen = svc_getnl(argv);                 /* gids length */
771         if (slen > 16 || (len -= (slen + 2)*4) < 0)
772                 goto badcred;
773         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
774             == -EAGAIN)
775                 return SVC_DROP;
776         if (cred->cr_group_info == NULL) {
777                 cred->cr_group_info = groups_alloc(slen);
778                 if (cred->cr_group_info == NULL)
779                         return SVC_DROP;
780                 for (i = 0; i < slen; i++)
781                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
782         } else {
783                 for (i = 0; i < slen ; i++)
784                         svc_getnl(argv);
785         }
786         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
787                 *authp = rpc_autherr_badverf;
788                 return SVC_DENIED;
789         }
790
791         /* Put NULL verifier */
792         svc_putnl(resv, RPC_AUTH_NULL);
793         svc_putnl(resv, 0);
794
795         rqstp->rq_flavor = RPC_AUTH_UNIX;
796         return SVC_OK;
797
798 badcred:
799         *authp = rpc_autherr_badcred;
800         return SVC_DENIED;
801 }
802
803 static int
804 svcauth_unix_release(struct svc_rqst *rqstp)
805 {
806         /* Verifier (such as it is) is already in place.
807          */
808         if (rqstp->rq_client)
809                 auth_domain_put(rqstp->rq_client);
810         rqstp->rq_client = NULL;
811         if (rqstp->rq_cred.cr_group_info)
812                 put_group_info(rqstp->rq_cred.cr_group_info);
813         rqstp->rq_cred.cr_group_info = NULL;
814
815         return 0;
816 }
817
818
819 struct auth_ops svcauth_unix = {
820         .name           = "unix",
821         .owner          = THIS_MODULE,
822         .flavour        = RPC_AUTH_UNIX,
823         .accept         = svcauth_unix_accept,
824         .release        = svcauth_unix_release,
825         .domain_release = svcauth_unix_domain_release,
826         .set_client     = svcauth_unix_set_client,
827 };
828