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Merge git://git.infradead.org/~dwmw2/mtd-2.6.33
[mirror_ubuntu-zesty-kernel.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 int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
175 {
176 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
177 }
178
179 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
180 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
181
182 static int ip_map_parse(struct cache_detail *cd,
183 char *mesg, int mlen)
184 {
185 /* class ipaddress [domainname] */
186 /* should be safe just to use the start of the input buffer
187 * for scratch: */
188 char *buf = mesg;
189 int len;
190 int b1, b2, b3, b4, b5, b6, b7, b8;
191 char c;
192 char class[8];
193 struct in6_addr addr;
194 int err;
195
196 struct ip_map *ipmp;
197 struct auth_domain *dom;
198 time_t expiry;
199
200 if (mesg[mlen-1] != '\n')
201 return -EINVAL;
202 mesg[mlen-1] = 0;
203
204 /* class */
205 len = qword_get(&mesg, class, sizeof(class));
206 if (len <= 0) return -EINVAL;
207
208 /* ip address */
209 len = qword_get(&mesg, buf, mlen);
210 if (len <= 0) return -EINVAL;
211
212 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) == 4) {
213 addr.s6_addr32[0] = 0;
214 addr.s6_addr32[1] = 0;
215 addr.s6_addr32[2] = htonl(0xffff);
216 addr.s6_addr32[3] =
217 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
218 } else if (sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x%c",
219 &b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
220 addr.s6_addr16[0] = htons(b1);
221 addr.s6_addr16[1] = htons(b2);
222 addr.s6_addr16[2] = htons(b3);
223 addr.s6_addr16[3] = htons(b4);
224 addr.s6_addr16[4] = htons(b5);
225 addr.s6_addr16[5] = htons(b6);
226 addr.s6_addr16[6] = htons(b7);
227 addr.s6_addr16[7] = htons(b8);
228 } else
229 return -EINVAL;
230
231 expiry = get_expiry(&mesg);
232 if (expiry ==0)
233 return -EINVAL;
234
235 /* domainname, or empty for NEGATIVE */
236 len = qword_get(&mesg, buf, mlen);
237 if (len < 0) return -EINVAL;
238
239 if (len) {
240 dom = unix_domain_find(buf);
241 if (dom == NULL)
242 return -ENOENT;
243 } else
244 dom = NULL;
245
246 ipmp = ip_map_lookup(class, &addr);
247 if (ipmp) {
248 err = ip_map_update(ipmp,
249 container_of(dom, struct unix_domain, h),
250 expiry);
251 } else
252 err = -ENOMEM;
253
254 if (dom)
255 auth_domain_put(dom);
256
257 cache_flush();
258 return err;
259 }
260
261 static int ip_map_show(struct seq_file *m,
262 struct cache_detail *cd,
263 struct cache_head *h)
264 {
265 struct ip_map *im;
266 struct in6_addr addr;
267 char *dom = "-no-domain-";
268
269 if (h == NULL) {
270 seq_puts(m, "#class IP domain\n");
271 return 0;
272 }
273 im = container_of(h, struct ip_map, h);
274 /* class addr domain */
275 ipv6_addr_copy(&addr, &im->m_addr);
276
277 if (test_bit(CACHE_VALID, &h->flags) &&
278 !test_bit(CACHE_NEGATIVE, &h->flags))
279 dom = im->m_client->h.name;
280
281 if (ipv6_addr_v4mapped(&addr)) {
282 seq_printf(m, "%s %pI4 %s\n",
283 im->m_class, &addr.s6_addr32[3], dom);
284 } else {
285 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
286 }
287 return 0;
288 }
289
290
291 struct cache_detail ip_map_cache = {
292 .owner = THIS_MODULE,
293 .hash_size = IP_HASHMAX,
294 .hash_table = ip_table,
295 .name = "auth.unix.ip",
296 .cache_put = ip_map_put,
297 .cache_upcall = ip_map_upcall,
298 .cache_parse = ip_map_parse,
299 .cache_show = ip_map_show,
300 .match = ip_map_match,
301 .init = ip_map_init,
302 .update = update,
303 .alloc = ip_map_alloc,
304 };
305
306 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
307 {
308 struct ip_map ip;
309 struct cache_head *ch;
310
311 strcpy(ip.m_class, class);
312 ipv6_addr_copy(&ip.m_addr, addr);
313 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
314 hash_str(class, IP_HASHBITS) ^
315 hash_ip6(*addr));
316
317 if (ch)
318 return container_of(ch, struct ip_map, h);
319 else
320 return NULL;
321 }
322
323 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
324 {
325 struct ip_map ip;
326 struct cache_head *ch;
327
328 ip.m_client = udom;
329 ip.h.flags = 0;
330 if (!udom)
331 set_bit(CACHE_NEGATIVE, &ip.h.flags);
332 else {
333 ip.m_add_change = udom->addr_changes;
334 /* if this is from the legacy set_client system call,
335 * we need m_add_change to be one higher
336 */
337 if (expiry == NEVER)
338 ip.m_add_change++;
339 }
340 ip.h.expiry_time = expiry;
341 ch = sunrpc_cache_update(&ip_map_cache,
342 &ip.h, &ipm->h,
343 hash_str(ipm->m_class, IP_HASHBITS) ^
344 hash_ip6(ipm->m_addr));
345 if (!ch)
346 return -ENOMEM;
347 cache_put(ch, &ip_map_cache);
348 return 0;
349 }
350
351 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
352 {
353 struct unix_domain *udom;
354 struct ip_map *ipmp;
355
356 if (dom->flavour != &svcauth_unix)
357 return -EINVAL;
358 udom = container_of(dom, struct unix_domain, h);
359 ipmp = ip_map_lookup("nfsd", addr);
360
361 if (ipmp)
362 return ip_map_update(ipmp, udom, NEVER);
363 else
364 return -ENOMEM;
365 }
366 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
367
368 int auth_unix_forget_old(struct auth_domain *dom)
369 {
370 struct unix_domain *udom;
371
372 if (dom->flavour != &svcauth_unix)
373 return -EINVAL;
374 udom = container_of(dom, struct unix_domain, h);
375 udom->addr_changes++;
376 return 0;
377 }
378 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
379
380 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
381 {
382 struct ip_map *ipm;
383 struct auth_domain *rv;
384
385 ipm = ip_map_lookup("nfsd", addr);
386
387 if (!ipm)
388 return NULL;
389 if (cache_check(&ip_map_cache, &ipm->h, NULL))
390 return NULL;
391
392 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
393 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
394 auth_domain_put(&ipm->m_client->h);
395 rv = NULL;
396 } else {
397 rv = &ipm->m_client->h;
398 kref_get(&rv->ref);
399 }
400 cache_put(&ipm->h, &ip_map_cache);
401 return rv;
402 }
403 EXPORT_SYMBOL_GPL(auth_unix_lookup);
404
405 void svcauth_unix_purge(void)
406 {
407 cache_purge(&ip_map_cache);
408 }
409 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
410
411 static inline struct ip_map *
412 ip_map_cached_get(struct svc_rqst *rqstp)
413 {
414 struct ip_map *ipm = NULL;
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 ipm = xprt->xpt_auth_cache;
420 if (ipm != NULL) {
421 if (!cache_valid(&ipm->h)) {
422 /*
423 * The entry has been invalidated since it was
424 * remembered, e.g. by a second mount from the
425 * same IP address.
426 */
427 xprt->xpt_auth_cache = NULL;
428 spin_unlock(&xprt->xpt_lock);
429 cache_put(&ipm->h, &ip_map_cache);
430 return NULL;
431 }
432 cache_get(&ipm->h);
433 }
434 spin_unlock(&xprt->xpt_lock);
435 }
436 return ipm;
437 }
438
439 static inline void
440 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
441 {
442 struct svc_xprt *xprt = rqstp->rq_xprt;
443
444 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
445 spin_lock(&xprt->xpt_lock);
446 if (xprt->xpt_auth_cache == NULL) {
447 /* newly cached, keep the reference */
448 xprt->xpt_auth_cache = ipm;
449 ipm = NULL;
450 }
451 spin_unlock(&xprt->xpt_lock);
452 }
453 if (ipm)
454 cache_put(&ipm->h, &ip_map_cache);
455 }
456
457 void
458 svcauth_unix_info_release(void *info)
459 {
460 struct ip_map *ipm = info;
461 cache_put(&ipm->h, &ip_map_cache);
462 }
463
464 /****************************************************************************
465 * auth.unix.gid cache
466 * simple cache to map a UID to a list of GIDs
467 * because AUTH_UNIX aka AUTH_SYS has a max of 16
468 */
469 #define GID_HASHBITS 8
470 #define GID_HASHMAX (1<<GID_HASHBITS)
471 #define GID_HASHMASK (GID_HASHMAX - 1)
472
473 struct unix_gid {
474 struct cache_head h;
475 uid_t uid;
476 struct group_info *gi;
477 };
478 static struct cache_head *gid_table[GID_HASHMAX];
479
480 static void unix_gid_put(struct kref *kref)
481 {
482 struct cache_head *item = container_of(kref, struct cache_head, ref);
483 struct unix_gid *ug = container_of(item, struct unix_gid, h);
484 if (test_bit(CACHE_VALID, &item->flags) &&
485 !test_bit(CACHE_NEGATIVE, &item->flags))
486 put_group_info(ug->gi);
487 kfree(ug);
488 }
489
490 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
491 {
492 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
493 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
494 return orig->uid == new->uid;
495 }
496 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
497 {
498 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
499 struct unix_gid *item = container_of(citem, struct unix_gid, h);
500 new->uid = item->uid;
501 }
502 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
503 {
504 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
505 struct unix_gid *item = container_of(citem, struct unix_gid, h);
506
507 get_group_info(item->gi);
508 new->gi = item->gi;
509 }
510 static struct cache_head *unix_gid_alloc(void)
511 {
512 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
513 if (g)
514 return &g->h;
515 else
516 return NULL;
517 }
518
519 static void unix_gid_request(struct cache_detail *cd,
520 struct cache_head *h,
521 char **bpp, int *blen)
522 {
523 char tuid[20];
524 struct unix_gid *ug = container_of(h, struct unix_gid, h);
525
526 snprintf(tuid, 20, "%u", ug->uid);
527 qword_add(bpp, blen, tuid);
528 (*bpp)[-1] = '\n';
529 }
530
531 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
532 {
533 return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
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_upcall = unix_gid_upcall,
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 struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
659 {
660 struct unix_gid *ug;
661 struct group_info *gi;
662 int ret;
663
664 ug = unix_gid_lookup(uid);
665 if (!ug)
666 return ERR_PTR(-EAGAIN);
667 ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
668 switch (ret) {
669 case -ENOENT:
670 return ERR_PTR(-ENOENT);
671 case 0:
672 gi = get_group_info(ug->gi);
673 cache_put(&ug->h, &unix_gid_cache);
674 return gi;
675 default:
676 return ERR_PTR(-EAGAIN);
677 }
678 }
679
680 int
681 svcauth_unix_set_client(struct svc_rqst *rqstp)
682 {
683 struct sockaddr_in *sin;
684 struct sockaddr_in6 *sin6, sin6_storage;
685 struct ip_map *ipm;
686 struct group_info *gi;
687 struct svc_cred *cred = &rqstp->rq_cred;
688
689 switch (rqstp->rq_addr.ss_family) {
690 case AF_INET:
691 sin = svc_addr_in(rqstp);
692 sin6 = &sin6_storage;
693 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
694 break;
695 case AF_INET6:
696 sin6 = svc_addr_in6(rqstp);
697 break;
698 default:
699 BUG();
700 }
701
702 rqstp->rq_client = NULL;
703 if (rqstp->rq_proc == 0)
704 return SVC_OK;
705
706 ipm = ip_map_cached_get(rqstp);
707 if (ipm == NULL)
708 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
709 &sin6->sin6_addr);
710
711 if (ipm == NULL)
712 return SVC_DENIED;
713
714 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
715 default:
716 BUG();
717 case -EAGAIN:
718 case -ETIMEDOUT:
719 return SVC_DROP;
720 case -ENOENT:
721 return SVC_DENIED;
722 case 0:
723 rqstp->rq_client = &ipm->m_client->h;
724 kref_get(&rqstp->rq_client->ref);
725 ip_map_cached_put(rqstp, ipm);
726 break;
727 }
728
729 gi = unix_gid_find(cred->cr_uid, rqstp);
730 switch (PTR_ERR(gi)) {
731 case -EAGAIN:
732 return SVC_DROP;
733 case -ENOENT:
734 break;
735 default:
736 put_group_info(cred->cr_group_info);
737 cred->cr_group_info = gi;
738 }
739 return SVC_OK;
740 }
741
742 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
743
744 static int
745 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
746 {
747 struct kvec *argv = &rqstp->rq_arg.head[0];
748 struct kvec *resv = &rqstp->rq_res.head[0];
749 struct svc_cred *cred = &rqstp->rq_cred;
750
751 cred->cr_group_info = NULL;
752 rqstp->rq_client = NULL;
753
754 if (argv->iov_len < 3*4)
755 return SVC_GARBAGE;
756
757 if (svc_getu32(argv) != 0) {
758 dprintk("svc: bad null cred\n");
759 *authp = rpc_autherr_badcred;
760 return SVC_DENIED;
761 }
762 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
763 dprintk("svc: bad null verf\n");
764 *authp = rpc_autherr_badverf;
765 return SVC_DENIED;
766 }
767
768 /* Signal that mapping to nobody uid/gid is required */
769 cred->cr_uid = (uid_t) -1;
770 cred->cr_gid = (gid_t) -1;
771 cred->cr_group_info = groups_alloc(0);
772 if (cred->cr_group_info == NULL)
773 return SVC_DROP; /* kmalloc failure - client must retry */
774
775 /* Put NULL verifier */
776 svc_putnl(resv, RPC_AUTH_NULL);
777 svc_putnl(resv, 0);
778
779 rqstp->rq_flavor = RPC_AUTH_NULL;
780 return SVC_OK;
781 }
782
783 static int
784 svcauth_null_release(struct svc_rqst *rqstp)
785 {
786 if (rqstp->rq_client)
787 auth_domain_put(rqstp->rq_client);
788 rqstp->rq_client = NULL;
789 if (rqstp->rq_cred.cr_group_info)
790 put_group_info(rqstp->rq_cred.cr_group_info);
791 rqstp->rq_cred.cr_group_info = NULL;
792
793 return 0; /* don't drop */
794 }
795
796
797 struct auth_ops svcauth_null = {
798 .name = "null",
799 .owner = THIS_MODULE,
800 .flavour = RPC_AUTH_NULL,
801 .accept = svcauth_null_accept,
802 .release = svcauth_null_release,
803 .set_client = svcauth_unix_set_client,
804 };
805
806
807 static int
808 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
809 {
810 struct kvec *argv = &rqstp->rq_arg.head[0];
811 struct kvec *resv = &rqstp->rq_res.head[0];
812 struct svc_cred *cred = &rqstp->rq_cred;
813 u32 slen, i;
814 int len = argv->iov_len;
815
816 cred->cr_group_info = NULL;
817 rqstp->rq_client = NULL;
818
819 if ((len -= 3*4) < 0)
820 return SVC_GARBAGE;
821
822 svc_getu32(argv); /* length */
823 svc_getu32(argv); /* time stamp */
824 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
825 if (slen > 64 || (len -= (slen + 3)*4) < 0)
826 goto badcred;
827 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
828 argv->iov_len -= slen*4;
829
830 cred->cr_uid = svc_getnl(argv); /* uid */
831 cred->cr_gid = svc_getnl(argv); /* gid */
832 slen = svc_getnl(argv); /* gids length */
833 if (slen > 16 || (len -= (slen + 2)*4) < 0)
834 goto badcred;
835 cred->cr_group_info = groups_alloc(slen);
836 if (cred->cr_group_info == NULL)
837 return SVC_DROP;
838 for (i = 0; i < slen; i++)
839 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
840 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
841 *authp = rpc_autherr_badverf;
842 return SVC_DENIED;
843 }
844
845 /* Put NULL verifier */
846 svc_putnl(resv, RPC_AUTH_NULL);
847 svc_putnl(resv, 0);
848
849 rqstp->rq_flavor = RPC_AUTH_UNIX;
850 return SVC_OK;
851
852 badcred:
853 *authp = rpc_autherr_badcred;
854 return SVC_DENIED;
855 }
856
857 static int
858 svcauth_unix_release(struct svc_rqst *rqstp)
859 {
860 /* Verifier (such as it is) is already in place.
861 */
862 if (rqstp->rq_client)
863 auth_domain_put(rqstp->rq_client);
864 rqstp->rq_client = NULL;
865 if (rqstp->rq_cred.cr_group_info)
866 put_group_info(rqstp->rq_cred.cr_group_info);
867 rqstp->rq_cred.cr_group_info = NULL;
868
869 return 0;
870 }
871
872
873 struct auth_ops svcauth_unix = {
874 .name = "unix",
875 .owner = THIS_MODULE,
876 .flavour = RPC_AUTH_UNIX,
877 .accept = svcauth_unix_accept,
878 .release = svcauth_unix_release,
879 .domain_release = svcauth_unix_domain_release,
880 .set_client = svcauth_unix_set_client,
881 };
882
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