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elf: fix one check-after-use
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / svcauth_unix.c
blob5c865e2d299e86bd48eecd62aed16794faaf1566
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
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree