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cipso: unsigned buf_len cannot be negative
[linux-2.6/next.git] / net / sunrpc / svcauth_unix.c
blobf24800f2c098c3b83d812881af05947b062a1ed3
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(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, NIPQUAD_FMT,
166 ntohl(im->m_addr.s6_addr32[3]) >> 24 & 0xff,
167 ntohl(im->m_addr.s6_addr32[3]) >> 16 & 0xff,
168 ntohl(im->m_addr.s6_addr32[3]) >> 8 & 0xff,
169 ntohl(im->m_addr.s6_addr32[3]) >> 0 & 0xff);
170 } else {
171 snprintf(text_addr, 40, NIP6_FMT, NIP6(im->m_addr));
172 }
173 qword_add(bpp, blen, im->m_class);
174 qword_add(bpp, blen, text_addr);
175 (*bpp)[-1] = '\n';
176 }
177
178 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
179 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
180
181 static int ip_map_parse(struct cache_detail *cd,
182 char *mesg, int mlen)
183 {
184 /* class ipaddress [domainname] */
185 /* should be safe just to use the start of the input buffer
186 * for scratch: */
187 char *buf = mesg;
188 int len;
189 int b1, b2, b3, b4, b5, b6, b7, b8;
190 char c;
191 char class[8];
192 struct in6_addr addr;
193 int err;
194
195 struct ip_map *ipmp;
196 struct auth_domain *dom;
197 time_t expiry;
198
199 if (mesg[mlen-1] != '\n')
200 return -EINVAL;
201 mesg[mlen-1] = 0;
202
203 /* class */
204 len = qword_get(&mesg, class, sizeof(class));
205 if (len <= 0) return -EINVAL;
206
207 /* ip address */
208 len = qword_get(&mesg, buf, mlen);
209 if (len <= 0) return -EINVAL;
210
211 if (sscanf(buf, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) == 4) {
212 addr.s6_addr32[0] = 0;
213 addr.s6_addr32[1] = 0;
214 addr.s6_addr32[2] = htonl(0xffff);
215 addr.s6_addr32[3] =
216 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
217 } else if (sscanf(buf, NIP6_FMT "%c",
218 &b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
219 addr.s6_addr16[0] = htons(b1);
220 addr.s6_addr16[1] = htons(b2);
221 addr.s6_addr16[2] = htons(b3);
222 addr.s6_addr16[3] = htons(b4);
223 addr.s6_addr16[4] = htons(b5);
224 addr.s6_addr16[5] = htons(b6);
225 addr.s6_addr16[6] = htons(b7);
226 addr.s6_addr16[7] = htons(b8);
227 } else
228 return -EINVAL;
229
230 expiry = get_expiry(&mesg);
231 if (expiry ==0)
232 return -EINVAL;
233
234 /* domainname, or empty for NEGATIVE */
235 len = qword_get(&mesg, buf, mlen);
236 if (len < 0) return -EINVAL;
237
238 if (len) {
239 dom = unix_domain_find(buf);
240 if (dom == NULL)
241 return -ENOENT;
242 } else
243 dom = NULL;
244
245 ipmp = ip_map_lookup(class, &addr);
246 if (ipmp) {
247 err = ip_map_update(ipmp,
248 container_of(dom, struct unix_domain, h),
249 expiry);
250 } else
251 err = -ENOMEM;
252
253 if (dom)
254 auth_domain_put(dom);
255
256 cache_flush();
257 return err;
258 }
259
260 static int ip_map_show(struct seq_file *m,
261 struct cache_detail *cd,
262 struct cache_head *h)
263 {
264 struct ip_map *im;
265 struct in6_addr addr;
266 char *dom = "-no-domain-";
267
268 if (h == NULL) {
269 seq_puts(m, "#class IP domain\n");
270 return 0;
271 }
272 im = container_of(h, struct ip_map, h);
273 /* class addr domain */
274 ipv6_addr_copy(&addr, &im->m_addr);
275
276 if (test_bit(CACHE_VALID, &h->flags) &&
277 !test_bit(CACHE_NEGATIVE, &h->flags))
278 dom = im->m_client->h.name;
279
280 if (ipv6_addr_v4mapped(&addr)) {
281 seq_printf(m, "%s " NIPQUAD_FMT " %s\n",
282 im->m_class,
283 ntohl(addr.s6_addr32[3]) >> 24 & 0xff,
284 ntohl(addr.s6_addr32[3]) >> 16 & 0xff,
285 ntohl(addr.s6_addr32[3]) >> 8 & 0xff,
286 ntohl(addr.s6_addr32[3]) >> 0 & 0xff,
287 dom);
288 } else {
289 seq_printf(m, "%s " NIP6_FMT " %s\n",
290 im->m_class, NIP6(addr), dom);
291 }
292 return 0;
293 }
294
295
296 struct cache_detail ip_map_cache = {
297 .owner = THIS_MODULE,
298 .hash_size = IP_HASHMAX,
299 .hash_table = ip_table,
300 .name = "auth.unix.ip",
301 .cache_put = ip_map_put,
302 .cache_request = ip_map_request,
303 .cache_parse = ip_map_parse,
304 .cache_show = ip_map_show,
305 .match = ip_map_match,
306 .init = ip_map_init,
307 .update = update,
308 .alloc = ip_map_alloc,
309 };
310
311 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
312 {
313 struct ip_map ip;
314 struct cache_head *ch;
315
316 strcpy(ip.m_class, class);
317 ipv6_addr_copy(&ip.m_addr, addr);
318 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
319 hash_str(class, IP_HASHBITS) ^
320 hash_ip6(*addr));
321
322 if (ch)
323 return container_of(ch, struct ip_map, h);
324 else
325 return NULL;
326 }
327
328 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
329 {
330 struct ip_map ip;
331 struct cache_head *ch;
332
333 ip.m_client = udom;
334 ip.h.flags = 0;
335 if (!udom)
336 set_bit(CACHE_NEGATIVE, &ip.h.flags);
337 else {
338 ip.m_add_change = udom->addr_changes;
339 /* if this is from the legacy set_client system call,
340 * we need m_add_change to be one higher
341 */
342 if (expiry == NEVER)
343 ip.m_add_change++;
344 }
345 ip.h.expiry_time = expiry;
346 ch = sunrpc_cache_update(&ip_map_cache,
347 &ip.h, &ipm->h,
348 hash_str(ipm->m_class, IP_HASHBITS) ^
349 hash_ip6(ipm->m_addr));
350 if (!ch)
351 return -ENOMEM;
352 cache_put(ch, &ip_map_cache);
353 return 0;
354 }
355
356 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
357 {
358 struct unix_domain *udom;
359 struct ip_map *ipmp;
360
361 if (dom->flavour != &svcauth_unix)
362 return -EINVAL;
363 udom = container_of(dom, struct unix_domain, h);
364 ipmp = ip_map_lookup("nfsd", addr);
365
366 if (ipmp)
367 return ip_map_update(ipmp, udom, NEVER);
368 else
369 return -ENOMEM;
370 }
371 EXPORT_SYMBOL(auth_unix_add_addr);
372
373 int auth_unix_forget_old(struct auth_domain *dom)
374 {
375 struct unix_domain *udom;
376
377 if (dom->flavour != &svcauth_unix)
378 return -EINVAL;
379 udom = container_of(dom, struct unix_domain, h);
380 udom->addr_changes++;
381 return 0;
382 }
383 EXPORT_SYMBOL(auth_unix_forget_old);
384
385 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
386 {
387 struct ip_map *ipm;
388 struct auth_domain *rv;
389
390 ipm = ip_map_lookup("nfsd", addr);
391
392 if (!ipm)
393 return NULL;
394 if (cache_check(&ip_map_cache, &ipm->h, NULL))
395 return NULL;
396
397 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
398 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
399 auth_domain_put(&ipm->m_client->h);
400 rv = NULL;
401 } else {
402 rv = &ipm->m_client->h;
403 kref_get(&rv->ref);
404 }
405 cache_put(&ipm->h, &ip_map_cache);
406 return rv;
407 }
408 EXPORT_SYMBOL(auth_unix_lookup);
409
410 void svcauth_unix_purge(void)
411 {
412 cache_purge(&ip_map_cache);
413 }
414 EXPORT_SYMBOL(svcauth_unix_purge);
415
416 static inline struct ip_map *
417 ip_map_cached_get(struct svc_rqst *rqstp)
418 {
419 struct ip_map *ipm = NULL;
420 struct svc_xprt *xprt = rqstp->rq_xprt;
421
422 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
423 spin_lock(&xprt->xpt_lock);
424 ipm = xprt->xpt_auth_cache;
425 if (ipm != NULL) {
426 if (!cache_valid(&ipm->h)) {
427 /*
428 * The entry has been invalidated since it was
429 * remembered, e.g. by a second mount from the
430 * same IP address.
431 */
432 xprt->xpt_auth_cache = NULL;
433 spin_unlock(&xprt->xpt_lock);
434 cache_put(&ipm->h, &ip_map_cache);
435 return NULL;
436 }
437 cache_get(&ipm->h);
438 }
439 spin_unlock(&xprt->xpt_lock);
440 }
441 return ipm;
442 }
443
444 static inline void
445 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
446 {
447 struct svc_xprt *xprt = rqstp->rq_xprt;
448
449 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
450 spin_lock(&xprt->xpt_lock);
451 if (xprt->xpt_auth_cache == NULL) {
452 /* newly cached, keep the reference */
453 xprt->xpt_auth_cache = ipm;
454 ipm = NULL;
455 }
456 spin_unlock(&xprt->xpt_lock);
457 }
458 if (ipm)
459 cache_put(&ipm->h, &ip_map_cache);
460 }
461
462 void
463 svcauth_unix_info_release(void *info)
464 {
465 struct ip_map *ipm = info;
466 cache_put(&ipm->h, &ip_map_cache);
467 }
468
469 /****************************************************************************
470 * auth.unix.gid cache
471 * simple cache to map a UID to a list of GIDs
472 * because AUTH_UNIX aka AUTH_SYS has a max of 16
473 */
474 #define GID_HASHBITS 8
475 #define GID_HASHMAX (1<<GID_HASHBITS)
476 #define GID_HASHMASK (GID_HASHMAX - 1)
477
478 struct unix_gid {
479 struct cache_head h;
480 uid_t uid;
481 struct group_info *gi;
482 };
483 static struct cache_head *gid_table[GID_HASHMAX];
484
485 static void unix_gid_put(struct kref *kref)
486 {
487 struct cache_head *item = container_of(kref, struct cache_head, ref);
488 struct unix_gid *ug = container_of(item, struct unix_gid, h);
489 if (test_bit(CACHE_VALID, &item->flags) &&
490 !test_bit(CACHE_NEGATIVE, &item->flags))
491 put_group_info(ug->gi);
492 kfree(ug);
493 }
494
495 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
496 {
497 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
498 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
499 return orig->uid == new->uid;
500 }
501 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
502 {
503 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
504 struct unix_gid *item = container_of(citem, struct unix_gid, h);
505 new->uid = item->uid;
506 }
507 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
508 {
509 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
510 struct unix_gid *item = container_of(citem, struct unix_gid, h);
511
512 get_group_info(item->gi);
513 new->gi = item->gi;
514 }
515 static struct cache_head *unix_gid_alloc(void)
516 {
517 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
518 if (g)
519 return &g->h;
520 else
521 return NULL;
522 }
523
524 static void unix_gid_request(struct cache_detail *cd,
525 struct cache_head *h,
526 char **bpp, int *blen)
527 {
528 char tuid[20];
529 struct unix_gid *ug = container_of(h, struct unix_gid, h);
530
531 snprintf(tuid, 20, "%u", ug->uid);
532 qword_add(bpp, blen, tuid);
533 (*bpp)[-1] = '\n';
534 }
535
536 static struct unix_gid *unix_gid_lookup(uid_t uid);
537 extern struct cache_detail unix_gid_cache;
538
539 static int unix_gid_parse(struct cache_detail *cd,
540 char *mesg, int mlen)
541 {
542 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
543 int uid;
544 int gids;
545 int rv;
546 int i;
547 int err;
548 time_t expiry;
549 struct unix_gid ug, *ugp;
550
551 if (mlen <= 0 || mesg[mlen-1] != '\n')
552 return -EINVAL;
553 mesg[mlen-1] = 0;
554
555 rv = get_int(&mesg, &uid);
556 if (rv)
557 return -EINVAL;
558 ug.uid = uid;
559
560 expiry = get_expiry(&mesg);
561 if (expiry == 0)
562 return -EINVAL;
563
564 rv = get_int(&mesg, &gids);
565 if (rv || gids < 0 || gids > 8192)
566 return -EINVAL;
567
568 ug.gi = groups_alloc(gids);
569 if (!ug.gi)
570 return -ENOMEM;
571
572 for (i = 0 ; i < gids ; i++) {
573 int gid;
574 rv = get_int(&mesg, &gid);
575 err = -EINVAL;
576 if (rv)
577 goto out;
578 GROUP_AT(ug.gi, i) = gid;
579 }
580
581 ugp = unix_gid_lookup(uid);
582 if (ugp) {
583 struct cache_head *ch;
584 ug.h.flags = 0;
585 ug.h.expiry_time = expiry;
586 ch = sunrpc_cache_update(&unix_gid_cache,
587 &ug.h, &ugp->h,
588 hash_long(uid, GID_HASHBITS));
589 if (!ch)
590 err = -ENOMEM;
591 else {
592 err = 0;
593 cache_put(ch, &unix_gid_cache);
594 }
595 } else
596 err = -ENOMEM;
597 out:
598 if (ug.gi)
599 put_group_info(ug.gi);
600 return err;
601 }
602
603 static int unix_gid_show(struct seq_file *m,
604 struct cache_detail *cd,
605 struct cache_head *h)
606 {
607 struct unix_gid *ug;
608 int i;
609 int glen;
610
611 if (h == NULL) {
612 seq_puts(m, "#uid cnt: gids...\n");
613 return 0;
614 }
615 ug = container_of(h, struct unix_gid, h);
616 if (test_bit(CACHE_VALID, &h->flags) &&
617 !test_bit(CACHE_NEGATIVE, &h->flags))
618 glen = ug->gi->ngroups;
619 else
620 glen = 0;
621
622 seq_printf(m, "%d %d:", ug->uid, glen);
623 for (i = 0; i < glen; i++)
624 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
625 seq_printf(m, "\n");
626 return 0;
627 }
628
629 struct cache_detail unix_gid_cache = {
630 .owner = THIS_MODULE,
631 .hash_size = GID_HASHMAX,
632 .hash_table = gid_table,
633 .name = "auth.unix.gid",
634 .cache_put = unix_gid_put,
635 .cache_request = unix_gid_request,
636 .cache_parse = unix_gid_parse,
637 .cache_show = unix_gid_show,
638 .match = unix_gid_match,
639 .init = unix_gid_init,
640 .update = unix_gid_update,
641 .alloc = unix_gid_alloc,
642 };
643
644 static struct unix_gid *unix_gid_lookup(uid_t uid)
645 {
646 struct unix_gid ug;
647 struct cache_head *ch;
648
649 ug.uid = uid;
650 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
651 hash_long(uid, GID_HASHBITS));
652 if (ch)
653 return container_of(ch, struct unix_gid, h);
654 else
655 return NULL;
656 }
657
658 static int unix_gid_find(uid_t uid, struct group_info **gip,
659 struct svc_rqst *rqstp)
660 {
661 struct unix_gid *ug = unix_gid_lookup(uid);
662 if (!ug)
663 return -EAGAIN;
664 switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
665 case -ENOENT:
666 *gip = NULL;
667 return 0;
668 case 0:
669 *gip = ug->gi;
670 get_group_info(*gip);
671 return 0;
672 default:
673 return -EAGAIN;
674 }
675 }
676
677 int
678 svcauth_unix_set_client(struct svc_rqst *rqstp)
679 {
680 struct sockaddr_in *sin;
681 struct sockaddr_in6 *sin6, sin6_storage;
682 struct ip_map *ipm;
683
684 switch (rqstp->rq_addr.ss_family) {
685 case AF_INET:
686 sin = svc_addr_in(rqstp);
687 sin6 = &sin6_storage;
688 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
689 htonl(0x0000FFFF), sin->sin_addr.s_addr);
690 break;
691 case AF_INET6:
692 sin6 = svc_addr_in6(rqstp);
693 break;
694 default:
695 BUG();
696 }
697
698 rqstp->rq_client = NULL;
699 if (rqstp->rq_proc == 0)
700 return SVC_OK;
701
702 ipm = ip_map_cached_get(rqstp);
703 if (ipm == NULL)
704 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
705 &sin6->sin6_addr);
706
707 if (ipm == NULL)
708 return SVC_DENIED;
709
710 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
711 default:
712 BUG();
713 case -EAGAIN:
714 case -ETIMEDOUT:
715 return SVC_DROP;
716 case -ENOENT:
717 return SVC_DENIED;
718 case 0:
719 rqstp->rq_client = &ipm->m_client->h;
720 kref_get(&rqstp->rq_client->ref);
721 ip_map_cached_put(rqstp, ipm);
722 break;
723 }
724 return SVC_OK;
725 }
726
727 EXPORT_SYMBOL(svcauth_unix_set_client);
728
729 static int
730 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
731 {
732 struct kvec *argv = &rqstp->rq_arg.head[0];
733 struct kvec *resv = &rqstp->rq_res.head[0];
734 struct svc_cred *cred = &rqstp->rq_cred;
735
736 cred->cr_group_info = NULL;
737 rqstp->rq_client = NULL;
738
739 if (argv->iov_len < 3*4)
740 return SVC_GARBAGE;
741
742 if (svc_getu32(argv) != 0) {
743 dprintk("svc: bad null cred\n");
744 *authp = rpc_autherr_badcred;
745 return SVC_DENIED;
746 }
747 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
748 dprintk("svc: bad null verf\n");
749 *authp = rpc_autherr_badverf;
750 return SVC_DENIED;
751 }
752
753 /* Signal that mapping to nobody uid/gid is required */
754 cred->cr_uid = (uid_t) -1;
755 cred->cr_gid = (gid_t) -1;
756 cred->cr_group_info = groups_alloc(0);
757 if (cred->cr_group_info == NULL)
758 return SVC_DROP; /* kmalloc failure - client must retry */
759
760 /* Put NULL verifier */
761 svc_putnl(resv, RPC_AUTH_NULL);
762 svc_putnl(resv, 0);
763
764 rqstp->rq_flavor = RPC_AUTH_NULL;
765 return SVC_OK;
766 }
767
768 static int
769 svcauth_null_release(struct svc_rqst *rqstp)
770 {
771 if (rqstp->rq_client)
772 auth_domain_put(rqstp->rq_client);
773 rqstp->rq_client = NULL;
774 if (rqstp->rq_cred.cr_group_info)
775 put_group_info(rqstp->rq_cred.cr_group_info);
776 rqstp->rq_cred.cr_group_info = NULL;
777
778 return 0; /* don't drop */
779 }
780
781
782 struct auth_ops svcauth_null = {
783 .name = "null",
784 .owner = THIS_MODULE,
785 .flavour = RPC_AUTH_NULL,
786 .accept = svcauth_null_accept,
787 .release = svcauth_null_release,
788 .set_client = svcauth_unix_set_client,
789 };
790
791
792 static int
793 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
794 {
795 struct kvec *argv = &rqstp->rq_arg.head[0];
796 struct kvec *resv = &rqstp->rq_res.head[0];
797 struct svc_cred *cred = &rqstp->rq_cred;
798 u32 slen, i;
799 int len = argv->iov_len;
800
801 cred->cr_group_info = NULL;
802 rqstp->rq_client = NULL;
803
804 if ((len -= 3*4) < 0)
805 return SVC_GARBAGE;
806
807 svc_getu32(argv); /* length */
808 svc_getu32(argv); /* time stamp */
809 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
810 if (slen > 64 || (len -= (slen + 3)*4) < 0)
811 goto badcred;
812 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
813 argv->iov_len -= slen*4;
814
815 cred->cr_uid = svc_getnl(argv); /* uid */
816 cred->cr_gid = svc_getnl(argv); /* gid */
817 slen = svc_getnl(argv); /* gids length */
818 if (slen > 16 || (len -= (slen + 2)*4) < 0)
819 goto badcred;
820 if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
821 == -EAGAIN)
822 return SVC_DROP;
823 if (cred->cr_group_info == NULL) {
824 cred->cr_group_info = groups_alloc(slen);
825 if (cred->cr_group_info == NULL)
826 return SVC_DROP;
827 for (i = 0; i < slen; i++)
828 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
829 } else {
830 for (i = 0; i < slen ; i++)
831 svc_getnl(argv);
832 }
833 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
834 *authp = rpc_autherr_badverf;
835 return SVC_DENIED;
836 }
837
838 /* Put NULL verifier */
839 svc_putnl(resv, RPC_AUTH_NULL);
840 svc_putnl(resv, 0);
841
842 rqstp->rq_flavor = RPC_AUTH_UNIX;
843 return SVC_OK;
844
845 badcred:
846 *authp = rpc_autherr_badcred;
847 return SVC_DENIED;
848 }
849
850 static int
851 svcauth_unix_release(struct svc_rqst *rqstp)
852 {
853 /* Verifier (such as it is) is already in place.
854 */
855 if (rqstp->rq_client)
856 auth_domain_put(rqstp->rq_client);
857 rqstp->rq_client = NULL;
858 if (rqstp->rq_cred.cr_group_info)
859 put_group_info(rqstp->rq_cred.cr_group_info);
860 rqstp->rq_cred.cr_group_info = NULL;
861
862 return 0;
863 }
864
865
866 struct auth_ops svcauth_unix = {
867 .name = "unix",
868 .owner = THIS_MODULE,
869 .flavour = RPC_AUTH_UNIX,
870 .accept = svcauth_unix_accept,
871 .release = svcauth_unix_release,
872 .domain_release = svcauth_unix_domain_release,
873 .set_client = svcauth_unix_set_client,
874 };
875
linux-next