SUNRPC: The sunrpc server code should not be used by out-of-tree modules
[linux-2.6.git] / 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 #include <net/ipv6.h>
15 #include <linux/kernel.h>
16 #define RPCDBG_FACILITY RPCDBG_AUTH
17
18
19 /*
20  * AUTHUNIX and AUTHNULL credentials are both handled here.
21  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
22  * are always nobody (-2).  i.e. we do the same IP address checks for
23  * AUTHNULL as for AUTHUNIX, and that is done here.
24  */
25
26
27 struct unix_domain {
28         struct auth_domain      h;
29         int     addr_changes;
30         /* other stuff later */
31 };
32
33 extern struct auth_ops svcauth_unix;
34
35 struct auth_domain *unix_domain_find(char *name)
36 {
37         struct auth_domain *rv;
38         struct unix_domain *new = NULL;
39
40         rv = auth_domain_lookup(name, NULL);
41         while(1) {
42                 if (rv) {
43                         if (new && rv != &new->h)
44                                 auth_domain_put(&new->h);
45
46                         if (rv->flavour != &svcauth_unix) {
47                                 auth_domain_put(rv);
48                                 return NULL;
49                         }
50                         return rv;
51                 }
52
53                 new = kmalloc(sizeof(*new), GFP_KERNEL);
54                 if (new == NULL)
55                         return NULL;
56                 kref_init(&new->h.ref);
57                 new->h.name = kstrdup(name, GFP_KERNEL);
58                 if (new->h.name == NULL) {
59                         kfree(new);
60                         return NULL;
61                 }
62                 new->h.flavour = &svcauth_unix;
63                 new->addr_changes = 0;
64                 rv = auth_domain_lookup(name, &new->h);
65         }
66 }
67 EXPORT_SYMBOL_GPL(unix_domain_find);
68
69 static void svcauth_unix_domain_release(struct auth_domain *dom)
70 {
71         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
72
73         kfree(dom->name);
74         kfree(ud);
75 }
76
77
78 /**************************************************
79  * cache for IP address to unix_domain
80  * as needed by AUTH_UNIX
81  */
82 #define IP_HASHBITS     8
83 #define IP_HASHMAX      (1<<IP_HASHBITS)
84 #define IP_HASHMASK     (IP_HASHMAX-1)
85
86 struct ip_map {
87         struct cache_head       h;
88         char                    m_class[8]; /* e.g. "nfsd" */
89         struct in6_addr         m_addr;
90         struct unix_domain      *m_client;
91         int                     m_add_change;
92 };
93 static struct cache_head        *ip_table[IP_HASHMAX];
94
95 static void ip_map_put(struct kref *kref)
96 {
97         struct cache_head *item = container_of(kref, struct cache_head, ref);
98         struct ip_map *im = container_of(item, struct ip_map,h);
99
100         if (test_bit(CACHE_VALID, &item->flags) &&
101             !test_bit(CACHE_NEGATIVE, &item->flags))
102                 auth_domain_put(&im->m_client->h);
103         kfree(im);
104 }
105
106 #if IP_HASHBITS == 8
107 /* hash_long on a 64 bit machine is currently REALLY BAD for
108  * IP addresses in reverse-endian (i.e. on a little-endian machine).
109  * So use a trivial but reliable hash instead
110  */
111 static inline int hash_ip(__be32 ip)
112 {
113         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
114         return (hash ^ (hash>>8)) & 0xff;
115 }
116 #endif
117 static inline int hash_ip6(struct in6_addr ip)
118 {
119         return (hash_ip(ip.s6_addr32[0]) ^
120                 hash_ip(ip.s6_addr32[1]) ^
121                 hash_ip(ip.s6_addr32[2]) ^
122                 hash_ip(ip.s6_addr32[3]));
123 }
124 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
125 {
126         struct ip_map *orig = container_of(corig, struct ip_map, h);
127         struct ip_map *new = container_of(cnew, struct ip_map, h);
128         return strcmp(orig->m_class, new->m_class) == 0
129                 && ipv6_addr_equal(&orig->m_addr, &new->m_addr);
130 }
131 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
132 {
133         struct ip_map *new = container_of(cnew, struct ip_map, h);
134         struct ip_map *item = container_of(citem, struct ip_map, h);
135
136         strcpy(new->m_class, item->m_class);
137         ipv6_addr_copy(&new->m_addr, &item->m_addr);
138 }
139 static void update(struct cache_head *cnew, struct cache_head *citem)
140 {
141         struct ip_map *new = container_of(cnew, struct ip_map, h);
142         struct ip_map *item = container_of(citem, struct ip_map, h);
143
144         kref_get(&item->m_client->h.ref);
145         new->m_client = item->m_client;
146         new->m_add_change = item->m_add_change;
147 }
148 static struct cache_head *ip_map_alloc(void)
149 {
150         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
151         if (i)
152                 return &i->h;
153         else
154                 return NULL;
155 }
156
157 static void ip_map_request(struct cache_detail *cd,
158                                   struct cache_head *h,
159                                   char **bpp, int *blen)
160 {
161         char text_addr[40];
162         struct ip_map *im = container_of(h, struct ip_map, h);
163
164         if (ipv6_addr_v4mapped(&(im->m_addr))) {
165                 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
166         } else {
167                 snprintf(text_addr, 40, "%pI6", &im->m_addr);
168         }
169         qword_add(bpp, blen, im->m_class);
170         qword_add(bpp, blen, text_addr);
171         (*bpp)[-1] = '\n';
172 }
173
174 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
175 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
176
177 static int ip_map_parse(struct cache_detail *cd,
178                           char *mesg, int mlen)
179 {
180         /* class ipaddress [domainname] */
181         /* should be safe just to use the start of the input buffer
182          * for scratch: */
183         char *buf = mesg;
184         int len;
185         int b1, b2, b3, b4, b5, b6, b7, b8;
186         char c;
187         char class[8];
188         struct in6_addr addr;
189         int err;
190
191         struct ip_map *ipmp;
192         struct auth_domain *dom;
193         time_t expiry;
194
195         if (mesg[mlen-1] != '\n')
196                 return -EINVAL;
197         mesg[mlen-1] = 0;
198
199         /* class */
200         len = qword_get(&mesg, class, sizeof(class));
201         if (len <= 0) return -EINVAL;
202
203         /* ip address */
204         len = qword_get(&mesg, buf, mlen);
205         if (len <= 0) return -EINVAL;
206
207         if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) == 4) {
208                 addr.s6_addr32[0] = 0;
209                 addr.s6_addr32[1] = 0;
210                 addr.s6_addr32[2] = htonl(0xffff);
211                 addr.s6_addr32[3] =
212                         htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
213        } else if (sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x%c",
214                         &b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
215                 addr.s6_addr16[0] = htons(b1);
216                 addr.s6_addr16[1] = htons(b2);
217                 addr.s6_addr16[2] = htons(b3);
218                 addr.s6_addr16[3] = htons(b4);
219                 addr.s6_addr16[4] = htons(b5);
220                 addr.s6_addr16[5] = htons(b6);
221                 addr.s6_addr16[6] = htons(b7);
222                 addr.s6_addr16[7] = htons(b8);
223        } else
224                 return -EINVAL;
225
226         expiry = get_expiry(&mesg);
227         if (expiry ==0)
228                 return -EINVAL;
229
230         /* domainname, or empty for NEGATIVE */
231         len = qword_get(&mesg, buf, mlen);
232         if (len < 0) return -EINVAL;
233
234         if (len) {
235                 dom = unix_domain_find(buf);
236                 if (dom == NULL)
237                         return -ENOENT;
238         } else
239                 dom = NULL;
240
241         ipmp = ip_map_lookup(class, &addr);
242         if (ipmp) {
243                 err = ip_map_update(ipmp,
244                              container_of(dom, struct unix_domain, h),
245                              expiry);
246         } else
247                 err = -ENOMEM;
248
249         if (dom)
250                 auth_domain_put(dom);
251
252         cache_flush();
253         return err;
254 }
255
256 static int ip_map_show(struct seq_file *m,
257                        struct cache_detail *cd,
258                        struct cache_head *h)
259 {
260         struct ip_map *im;
261         struct in6_addr addr;
262         char *dom = "-no-domain-";
263
264         if (h == NULL) {
265                 seq_puts(m, "#class IP domain\n");
266                 return 0;
267         }
268         im = container_of(h, struct ip_map, h);
269         /* class addr domain */
270         ipv6_addr_copy(&addr, &im->m_addr);
271
272         if (test_bit(CACHE_VALID, &h->flags) &&
273             !test_bit(CACHE_NEGATIVE, &h->flags))
274                 dom = im->m_client->h.name;
275
276         if (ipv6_addr_v4mapped(&addr)) {
277                 seq_printf(m, "%s %pI4 %s\n",
278                         im->m_class, &addr.s6_addr32[3], dom);
279         } else {
280                 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
281         }
282         return 0;
283 }
284
285
286 struct cache_detail ip_map_cache = {
287         .owner          = THIS_MODULE,
288         .hash_size      = IP_HASHMAX,
289         .hash_table     = ip_table,
290         .name           = "auth.unix.ip",
291         .cache_put      = ip_map_put,
292         .cache_request  = ip_map_request,
293         .cache_parse    = ip_map_parse,
294         .cache_show     = ip_map_show,
295         .match          = ip_map_match,
296         .init           = ip_map_init,
297         .update         = update,
298         .alloc          = ip_map_alloc,
299 };
300
301 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
302 {
303         struct ip_map ip;
304         struct cache_head *ch;
305
306         strcpy(ip.m_class, class);
307         ipv6_addr_copy(&ip.m_addr, addr);
308         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
309                                  hash_str(class, IP_HASHBITS) ^
310                                  hash_ip6(*addr));
311
312         if (ch)
313                 return container_of(ch, struct ip_map, h);
314         else
315                 return NULL;
316 }
317
318 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
319 {
320         struct ip_map ip;
321         struct cache_head *ch;
322
323         ip.m_client = udom;
324         ip.h.flags = 0;
325         if (!udom)
326                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
327         else {
328                 ip.m_add_change = udom->addr_changes;
329                 /* if this is from the legacy set_client system call,
330                  * we need m_add_change to be one higher
331                  */
332                 if (expiry == NEVER)
333                         ip.m_add_change++;
334         }
335         ip.h.expiry_time = expiry;
336         ch = sunrpc_cache_update(&ip_map_cache,
337                                  &ip.h, &ipm->h,
338                                  hash_str(ipm->m_class, IP_HASHBITS) ^
339                                  hash_ip6(ipm->m_addr));
340         if (!ch)
341                 return -ENOMEM;
342         cache_put(ch, &ip_map_cache);
343         return 0;
344 }
345
346 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
347 {
348         struct unix_domain *udom;
349         struct ip_map *ipmp;
350
351         if (dom->flavour != &svcauth_unix)
352                 return -EINVAL;
353         udom = container_of(dom, struct unix_domain, h);
354         ipmp = ip_map_lookup("nfsd", addr);
355
356         if (ipmp)
357                 return ip_map_update(ipmp, udom, NEVER);
358         else
359                 return -ENOMEM;
360 }
361 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
362
363 int auth_unix_forget_old(struct auth_domain *dom)
364 {
365         struct unix_domain *udom;
366
367         if (dom->flavour != &svcauth_unix)
368                 return -EINVAL;
369         udom = container_of(dom, struct unix_domain, h);
370         udom->addr_changes++;
371         return 0;
372 }
373 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
374
375 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
376 {
377         struct ip_map *ipm;
378         struct auth_domain *rv;
379
380         ipm = ip_map_lookup("nfsd", addr);
381
382         if (!ipm)
383                 return NULL;
384         if (cache_check(&ip_map_cache, &ipm->h, NULL))
385                 return NULL;
386
387         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
388                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
389                         auth_domain_put(&ipm->m_client->h);
390                 rv = NULL;
391         } else {
392                 rv = &ipm->m_client->h;
393                 kref_get(&rv->ref);
394         }
395         cache_put(&ipm->h, &ip_map_cache);
396         return rv;
397 }
398 EXPORT_SYMBOL_GPL(auth_unix_lookup);
399
400 void svcauth_unix_purge(void)
401 {
402         cache_purge(&ip_map_cache);
403 }
404 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
405
406 static inline struct ip_map *
407 ip_map_cached_get(struct svc_rqst *rqstp)
408 {
409         struct ip_map *ipm = NULL;
410         struct svc_xprt *xprt = rqstp->rq_xprt;
411
412         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
413                 spin_lock(&xprt->xpt_lock);
414                 ipm = xprt->xpt_auth_cache;
415                 if (ipm != NULL) {
416                         if (!cache_valid(&ipm->h)) {
417                                 /*
418                                  * The entry has been invalidated since it was
419                                  * remembered, e.g. by a second mount from the
420                                  * same IP address.
421                                  */
422                                 xprt->xpt_auth_cache = NULL;
423                                 spin_unlock(&xprt->xpt_lock);
424                                 cache_put(&ipm->h, &ip_map_cache);
425                                 return NULL;
426                         }
427                         cache_get(&ipm->h);
428                 }
429                 spin_unlock(&xprt->xpt_lock);
430         }
431         return ipm;
432 }
433
434 static inline void
435 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
436 {
437         struct svc_xprt *xprt = rqstp->rq_xprt;
438
439         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
440                 spin_lock(&xprt->xpt_lock);
441                 if (xprt->xpt_auth_cache == NULL) {
442                         /* newly cached, keep the reference */
443                         xprt->xpt_auth_cache = ipm;
444                         ipm = NULL;
445                 }
446                 spin_unlock(&xprt->xpt_lock);
447         }
448         if (ipm)
449                 cache_put(&ipm->h, &ip_map_cache);
450 }
451
452 void
453 svcauth_unix_info_release(void *info)
454 {
455         struct ip_map *ipm = info;
456         cache_put(&ipm->h, &ip_map_cache);
457 }
458
459 /****************************************************************************
460  * auth.unix.gid cache
461  * simple cache to map a UID to a list of GIDs
462  * because AUTH_UNIX aka AUTH_SYS has a max of 16
463  */
464 #define GID_HASHBITS    8
465 #define GID_HASHMAX     (1<<GID_HASHBITS)
466 #define GID_HASHMASK    (GID_HASHMAX - 1)
467
468 struct unix_gid {
469         struct cache_head       h;
470         uid_t                   uid;
471         struct group_info       *gi;
472 };
473 static struct cache_head        *gid_table[GID_HASHMAX];
474
475 static void unix_gid_put(struct kref *kref)
476 {
477         struct cache_head *item = container_of(kref, struct cache_head, ref);
478         struct unix_gid *ug = container_of(item, struct unix_gid, h);
479         if (test_bit(CACHE_VALID, &item->flags) &&
480             !test_bit(CACHE_NEGATIVE, &item->flags))
481                 put_group_info(ug->gi);
482         kfree(ug);
483 }
484
485 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
486 {
487         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
488         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
489         return orig->uid == new->uid;
490 }
491 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
492 {
493         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
494         struct unix_gid *item = container_of(citem, struct unix_gid, h);
495         new->uid = item->uid;
496 }
497 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
498 {
499         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
500         struct unix_gid *item = container_of(citem, struct unix_gid, h);
501
502         get_group_info(item->gi);
503         new->gi = item->gi;
504 }
505 static struct cache_head *unix_gid_alloc(void)
506 {
507         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
508         if (g)
509                 return &g->h;
510         else
511                 return NULL;
512 }
513
514 static void unix_gid_request(struct cache_detail *cd,
515                              struct cache_head *h,
516                              char **bpp, int *blen)
517 {
518         char tuid[20];
519         struct unix_gid *ug = container_of(h, struct unix_gid, h);
520
521         snprintf(tuid, 20, "%u", ug->uid);
522         qword_add(bpp, blen, tuid);
523         (*bpp)[-1] = '\n';
524 }
525
526 static struct unix_gid *unix_gid_lookup(uid_t uid);
527 extern struct cache_detail unix_gid_cache;
528
529 static int unix_gid_parse(struct cache_detail *cd,
530                         char *mesg, int mlen)
531 {
532         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
533         int uid;
534         int gids;
535         int rv;
536         int i;
537         int err;
538         time_t expiry;
539         struct unix_gid ug, *ugp;
540
541         if (mlen <= 0 || mesg[mlen-1] != '\n')
542                 return -EINVAL;
543         mesg[mlen-1] = 0;
544
545         rv = get_int(&mesg, &uid);
546         if (rv)
547                 return -EINVAL;
548         ug.uid = uid;
549
550         expiry = get_expiry(&mesg);
551         if (expiry == 0)
552                 return -EINVAL;
553
554         rv = get_int(&mesg, &gids);
555         if (rv || gids < 0 || gids > 8192)
556                 return -EINVAL;
557
558         ug.gi = groups_alloc(gids);
559         if (!ug.gi)
560                 return -ENOMEM;
561
562         for (i = 0 ; i < gids ; i++) {
563                 int gid;
564                 rv = get_int(&mesg, &gid);
565                 err = -EINVAL;
566                 if (rv)
567                         goto out;
568                 GROUP_AT(ug.gi, i) = gid;
569         }
570
571         ugp = unix_gid_lookup(uid);
572         if (ugp) {
573                 struct cache_head *ch;
574                 ug.h.flags = 0;
575                 ug.h.expiry_time = expiry;
576                 ch = sunrpc_cache_update(&unix_gid_cache,
577                                          &ug.h, &ugp->h,
578                                          hash_long(uid, GID_HASHBITS));
579                 if (!ch)
580                         err = -ENOMEM;
581                 else {
582                         err = 0;
583                         cache_put(ch, &unix_gid_cache);
584                 }
585         } else
586                 err = -ENOMEM;
587  out:
588         if (ug.gi)
589                 put_group_info(ug.gi);
590         return err;
591 }
592
593 static int unix_gid_show(struct seq_file *m,
594                          struct cache_detail *cd,
595                          struct cache_head *h)
596 {
597         struct unix_gid *ug;
598         int i;
599         int glen;
600
601         if (h == NULL) {
602                 seq_puts(m, "#uid cnt: gids...\n");
603                 return 0;
604         }
605         ug = container_of(h, struct unix_gid, h);
606         if (test_bit(CACHE_VALID, &h->flags) &&
607             !test_bit(CACHE_NEGATIVE, &h->flags))
608                 glen = ug->gi->ngroups;
609         else
610                 glen = 0;
611
612         seq_printf(m, "%d %d:", ug->uid, glen);
613         for (i = 0; i < glen; i++)
614                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
615         seq_printf(m, "\n");
616         return 0;
617 }
618
619 struct cache_detail unix_gid_cache = {
620         .owner          = THIS_MODULE,
621         .hash_size      = GID_HASHMAX,
622         .hash_table     = gid_table,
623         .name           = "auth.unix.gid",
624         .cache_put      = unix_gid_put,
625         .cache_request  = unix_gid_request,
626         .cache_parse    = unix_gid_parse,
627         .cache_show     = unix_gid_show,
628         .match          = unix_gid_match,
629         .init           = unix_gid_init,
630         .update         = unix_gid_update,
631         .alloc          = unix_gid_alloc,
632 };
633
634 static struct unix_gid *unix_gid_lookup(uid_t uid)
635 {
636         struct unix_gid ug;
637         struct cache_head *ch;
638
639         ug.uid = uid;
640         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
641                                  hash_long(uid, GID_HASHBITS));
642         if (ch)
643                 return container_of(ch, struct unix_gid, h);
644         else
645                 return NULL;
646 }
647
648 static int unix_gid_find(uid_t uid, struct group_info **gip,
649                          struct svc_rqst *rqstp)
650 {
651         struct unix_gid *ug = unix_gid_lookup(uid);
652         if (!ug)
653                 return -EAGAIN;
654         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
655         case -ENOENT:
656                 *gip = NULL;
657                 return 0;
658         case 0:
659                 *gip = ug->gi;
660                 get_group_info(*gip);
661                 return 0;
662         default:
663                 return -EAGAIN;
664         }
665 }
666
667 int
668 svcauth_unix_set_client(struct svc_rqst *rqstp)
669 {
670         struct sockaddr_in *sin;
671         struct sockaddr_in6 *sin6, sin6_storage;
672         struct ip_map *ipm;
673
674         switch (rqstp->rq_addr.ss_family) {
675         case AF_INET:
676                 sin = svc_addr_in(rqstp);
677                 sin6 = &sin6_storage;
678                 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
679                                 htonl(0x0000FFFF), sin->sin_addr.s_addr);
680                 break;
681         case AF_INET6:
682                 sin6 = svc_addr_in6(rqstp);
683                 break;
684         default:
685                 BUG();
686         }
687
688         rqstp->rq_client = NULL;
689         if (rqstp->rq_proc == 0)
690                 return SVC_OK;
691
692         ipm = ip_map_cached_get(rqstp);
693         if (ipm == NULL)
694                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
695                                     &sin6->sin6_addr);
696
697         if (ipm == NULL)
698                 return SVC_DENIED;
699
700         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
701                 default:
702                         BUG();
703                 case -EAGAIN:
704                 case -ETIMEDOUT:
705                         return SVC_DROP;
706                 case -ENOENT:
707                         return SVC_DENIED;
708                 case 0:
709                         rqstp->rq_client = &ipm->m_client->h;
710                         kref_get(&rqstp->rq_client->ref);
711                         ip_map_cached_put(rqstp, ipm);
712                         break;
713         }
714         return SVC_OK;
715 }
716
717 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
718
719 static int
720 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
721 {
722         struct kvec     *argv = &rqstp->rq_arg.head[0];
723         struct kvec     *resv = &rqstp->rq_res.head[0];
724         struct svc_cred *cred = &rqstp->rq_cred;
725
726         cred->cr_group_info = NULL;
727         rqstp->rq_client = NULL;
728
729         if (argv->iov_len < 3*4)
730                 return SVC_GARBAGE;
731
732         if (svc_getu32(argv) != 0) {
733                 dprintk("svc: bad null cred\n");
734                 *authp = rpc_autherr_badcred;
735                 return SVC_DENIED;
736         }
737         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
738                 dprintk("svc: bad null verf\n");
739                 *authp = rpc_autherr_badverf;
740                 return SVC_DENIED;
741         }
742
743         /* Signal that mapping to nobody uid/gid is required */
744         cred->cr_uid = (uid_t) -1;
745         cred->cr_gid = (gid_t) -1;
746         cred->cr_group_info = groups_alloc(0);
747         if (cred->cr_group_info == NULL)
748                 return SVC_DROP; /* kmalloc failure - client must retry */
749
750         /* Put NULL verifier */
751         svc_putnl(resv, RPC_AUTH_NULL);
752         svc_putnl(resv, 0);
753
754         rqstp->rq_flavor = RPC_AUTH_NULL;
755         return SVC_OK;
756 }
757
758 static int
759 svcauth_null_release(struct svc_rqst *rqstp)
760 {
761         if (rqstp->rq_client)
762                 auth_domain_put(rqstp->rq_client);
763         rqstp->rq_client = NULL;
764         if (rqstp->rq_cred.cr_group_info)
765                 put_group_info(rqstp->rq_cred.cr_group_info);
766         rqstp->rq_cred.cr_group_info = NULL;
767
768         return 0; /* don't drop */
769 }
770
771
772 struct auth_ops svcauth_null = {
773         .name           = "null",
774         .owner          = THIS_MODULE,
775         .flavour        = RPC_AUTH_NULL,
776         .accept         = svcauth_null_accept,
777         .release        = svcauth_null_release,
778         .set_client     = svcauth_unix_set_client,
779 };
780
781
782 static int
783 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
784 {
785         struct kvec     *argv = &rqstp->rq_arg.head[0];
786         struct kvec     *resv = &rqstp->rq_res.head[0];
787         struct svc_cred *cred = &rqstp->rq_cred;
788         u32             slen, i;
789         int             len   = argv->iov_len;
790
791         cred->cr_group_info = NULL;
792         rqstp->rq_client = NULL;
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         cred->cr_uid = svc_getnl(argv);         /* uid */
806         cred->cr_gid = svc_getnl(argv);         /* gid */
807         slen = svc_getnl(argv);                 /* gids length */
808         if (slen > 16 || (len -= (slen + 2)*4) < 0)
809                 goto badcred;
810         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
811             == -EAGAIN)
812                 return SVC_DROP;
813         if (cred->cr_group_info == NULL) {
814                 cred->cr_group_info = groups_alloc(slen);
815                 if (cred->cr_group_info == NULL)
816                         return SVC_DROP;
817                 for (i = 0; i < slen; i++)
818                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
819         } else {
820                 for (i = 0; i < slen ; i++)
821                         svc_getnl(argv);
822         }
823         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
824                 *authp = rpc_autherr_badverf;
825                 return SVC_DENIED;
826         }
827
828         /* Put NULL verifier */
829         svc_putnl(resv, RPC_AUTH_NULL);
830         svc_putnl(resv, 0);
831
832         rqstp->rq_flavor = RPC_AUTH_UNIX;
833         return SVC_OK;
834
835 badcred:
836         *authp = rpc_autherr_badcred;
837         return SVC_DENIED;
838 }
839
840 static int
841 svcauth_unix_release(struct svc_rqst *rqstp)
842 {
843         /* Verifier (such as it is) is already in place.
844          */
845         if (rqstp->rq_client)
846                 auth_domain_put(rqstp->rq_client);
847         rqstp->rq_client = NULL;
848         if (rqstp->rq_cred.cr_group_info)
849                 put_group_info(rqstp->rq_cred.cr_group_info);
850         rqstp->rq_cred.cr_group_info = NULL;
851
852         return 0;
853 }
854
855
856 struct auth_ops svcauth_unix = {
857         .name           = "unix",
858         .owner          = THIS_MODULE,
859         .flavour        = RPC_AUTH_UNIX,
860         .accept         = svcauth_unix_accept,
861         .release        = svcauth_unix_release,
862         .domain_release = svcauth_unix_domain_release,
863         .set_client     = svcauth_unix_set_client,
864 };
865