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[deliverable/linux.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(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, "%p6", &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, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x%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 %p6 %s\n", im->m_class, &addr, dom);
290 }
291 return 0;
292 }
293
294
295 struct cache_detail ip_map_cache = {
296 .owner = THIS_MODULE,
297 .hash_size = IP_HASHMAX,
298 .hash_table = ip_table,
299 .name = "auth.unix.ip",
300 .cache_put = ip_map_put,
301 .cache_request = ip_map_request,
302 .cache_parse = ip_map_parse,
303 .cache_show = ip_map_show,
304 .match = ip_map_match,
305 .init = ip_map_init,
306 .update = update,
307 .alloc = ip_map_alloc,
308 };
309
310 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
311 {
312 struct ip_map ip;
313 struct cache_head *ch;
314
315 strcpy(ip.m_class, class);
316 ipv6_addr_copy(&ip.m_addr, addr);
317 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
318 hash_str(class, IP_HASHBITS) ^
319 hash_ip6(*addr));
320
321 if (ch)
322 return container_of(ch, struct ip_map, h);
323 else
324 return NULL;
325 }
326
327 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
328 {
329 struct ip_map ip;
330 struct cache_head *ch;
331
332 ip.m_client = udom;
333 ip.h.flags = 0;
334 if (!udom)
335 set_bit(CACHE_NEGATIVE, &ip.h.flags);
336 else {
337 ip.m_add_change = udom->addr_changes;
338 /* if this is from the legacy set_client system call,
339 * we need m_add_change to be one higher
340 */
341 if (expiry == NEVER)
342 ip.m_add_change++;
343 }
344 ip.h.expiry_time = expiry;
345 ch = sunrpc_cache_update(&ip_map_cache,
346 &ip.h, &ipm->h,
347 hash_str(ipm->m_class, IP_HASHBITS) ^
348 hash_ip6(ipm->m_addr));
349 if (!ch)
350 return -ENOMEM;
351 cache_put(ch, &ip_map_cache);
352 return 0;
353 }
354
355 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
356 {
357 struct unix_domain *udom;
358 struct ip_map *ipmp;
359
360 if (dom->flavour != &svcauth_unix)
361 return -EINVAL;
362 udom = container_of(dom, struct unix_domain, h);
363 ipmp = ip_map_lookup("nfsd", addr);
364
365 if (ipmp)
366 return ip_map_update(ipmp, udom, NEVER);
367 else
368 return -ENOMEM;
369 }
370 EXPORT_SYMBOL(auth_unix_add_addr);
371
372 int auth_unix_forget_old(struct auth_domain *dom)
373 {
374 struct unix_domain *udom;
375
376 if (dom->flavour != &svcauth_unix)
377 return -EINVAL;
378 udom = container_of(dom, struct unix_domain, h);
379 udom->addr_changes++;
380 return 0;
381 }
382 EXPORT_SYMBOL(auth_unix_forget_old);
383
384 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
385 {
386 struct ip_map *ipm;
387 struct auth_domain *rv;
388
389 ipm = ip_map_lookup("nfsd", addr);
390
391 if (!ipm)
392 return NULL;
393 if (cache_check(&ip_map_cache, &ipm->h, NULL))
394 return NULL;
395
396 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
397 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
398 auth_domain_put(&ipm->m_client->h);
399 rv = NULL;
400 } else {
401 rv = &ipm->m_client->h;
402 kref_get(&rv->ref);
403 }
404 cache_put(&ipm->h, &ip_map_cache);
405 return rv;
406 }
407 EXPORT_SYMBOL(auth_unix_lookup);
408
409 void svcauth_unix_purge(void)
410 {
411 cache_purge(&ip_map_cache);
412 }
413 EXPORT_SYMBOL(svcauth_unix_purge);
414
415 static inline struct ip_map *
416 ip_map_cached_get(struct svc_rqst *rqstp)
417 {
418 struct ip_map *ipm = NULL;
419 struct svc_xprt *xprt = rqstp->rq_xprt;
420
421 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
422 spin_lock(&xprt->xpt_lock);
423 ipm = xprt->xpt_auth_cache;
424 if (ipm != NULL) {
425 if (!cache_valid(&ipm->h)) {
426 /*
427 * The entry has been invalidated since it was
428 * remembered, e.g. by a second mount from the
429 * same IP address.
430 */
431 xprt->xpt_auth_cache = NULL;
432 spin_unlock(&xprt->xpt_lock);
433 cache_put(&ipm->h, &ip_map_cache);
434 return NULL;
435 }
436 cache_get(&ipm->h);
437 }
438 spin_unlock(&xprt->xpt_lock);
439 }
440 return ipm;
441 }
442
443 static inline void
444 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
445 {
446 struct svc_xprt *xprt = rqstp->rq_xprt;
447
448 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
449 spin_lock(&xprt->xpt_lock);
450 if (xprt->xpt_auth_cache == NULL) {
451 /* newly cached, keep the reference */
452 xprt->xpt_auth_cache = ipm;
453 ipm = NULL;
454 }
455 spin_unlock(&xprt->xpt_lock);
456 }
457 if (ipm)
458 cache_put(&ipm->h, &ip_map_cache);
459 }
460
461 void
462 svcauth_unix_info_release(void *info)
463 {
464 struct ip_map *ipm = info;
465 cache_put(&ipm->h, &ip_map_cache);
466 }
467
468 /****************************************************************************
469 * auth.unix.gid cache
470 * simple cache to map a UID to a list of GIDs
471 * because AUTH_UNIX aka AUTH_SYS has a max of 16
472 */
473 #define GID_HASHBITS 8
474 #define GID_HASHMAX (1<<GID_HASHBITS)
475 #define GID_HASHMASK (GID_HASHMAX - 1)
476
477 struct unix_gid {
478 struct cache_head h;
479 uid_t uid;
480 struct group_info *gi;
481 };
482 static struct cache_head *gid_table[GID_HASHMAX];
483
484 static void unix_gid_put(struct kref *kref)
485 {
486 struct cache_head *item = container_of(kref, struct cache_head, ref);
487 struct unix_gid *ug = container_of(item, struct unix_gid, h);
488 if (test_bit(CACHE_VALID, &item->flags) &&
489 !test_bit(CACHE_NEGATIVE, &item->flags))
490 put_group_info(ug->gi);
491 kfree(ug);
492 }
493
494 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
495 {
496 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
497 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
498 return orig->uid == new->uid;
499 }
500 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
501 {
502 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
503 struct unix_gid *item = container_of(citem, struct unix_gid, h);
504 new->uid = item->uid;
505 }
506 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
507 {
508 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
509 struct unix_gid *item = container_of(citem, struct unix_gid, h);
510
511 get_group_info(item->gi);
512 new->gi = item->gi;
513 }
514 static struct cache_head *unix_gid_alloc(void)
515 {
516 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
517 if (g)
518 return &g->h;
519 else
520 return NULL;
521 }
522
523 static void unix_gid_request(struct cache_detail *cd,
524 struct cache_head *h,
525 char **bpp, int *blen)
526 {
527 char tuid[20];
528 struct unix_gid *ug = container_of(h, struct unix_gid, h);
529
530 snprintf(tuid, 20, "%u", ug->uid);
531 qword_add(bpp, blen, tuid);
532 (*bpp)[-1] = '\n';
533 }
534
535 static struct unix_gid *unix_gid_lookup(uid_t uid);
536 extern struct cache_detail unix_gid_cache;
537
538 static int unix_gid_parse(struct cache_detail *cd,
539 char *mesg, int mlen)
540 {
541 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
542 int uid;
543 int gids;
544 int rv;
545 int i;
546 int err;
547 time_t expiry;
548 struct unix_gid ug, *ugp;
549
550 if (mlen <= 0 || mesg[mlen-1] != '\n')
551 return -EINVAL;
552 mesg[mlen-1] = 0;
553
554 rv = get_int(&mesg, &uid);
555 if (rv)
556 return -EINVAL;
557 ug.uid = uid;
558
559 expiry = get_expiry(&mesg);
560 if (expiry == 0)
561 return -EINVAL;
562
563 rv = get_int(&mesg, &gids);
564 if (rv || gids < 0 || gids > 8192)
565 return -EINVAL;
566
567 ug.gi = groups_alloc(gids);
568 if (!ug.gi)
569 return -ENOMEM;
570
571 for (i = 0 ; i < gids ; i++) {
572 int gid;
573 rv = get_int(&mesg, &gid);
574 err = -EINVAL;
575 if (rv)
576 goto out;
577 GROUP_AT(ug.gi, i) = gid;
578 }
579
580 ugp = unix_gid_lookup(uid);
581 if (ugp) {
582 struct cache_head *ch;
583 ug.h.flags = 0;
584 ug.h.expiry_time = expiry;
585 ch = sunrpc_cache_update(&unix_gid_cache,
586 &ug.h, &ugp->h,
587 hash_long(uid, GID_HASHBITS));
588 if (!ch)
589 err = -ENOMEM;
590 else {
591 err = 0;
592 cache_put(ch, &unix_gid_cache);
593 }
594 } else
595 err = -ENOMEM;
596 out:
597 if (ug.gi)
598 put_group_info(ug.gi);
599 return err;
600 }
601
602 static int unix_gid_show(struct seq_file *m,
603 struct cache_detail *cd,
604 struct cache_head *h)
605 {
606 struct unix_gid *ug;
607 int i;
608 int glen;
609
610 if (h == NULL) {
611 seq_puts(m, "#uid cnt: gids...\n");
612 return 0;
613 }
614 ug = container_of(h, struct unix_gid, h);
615 if (test_bit(CACHE_VALID, &h->flags) &&
616 !test_bit(CACHE_NEGATIVE, &h->flags))
617 glen = ug->gi->ngroups;
618 else
619 glen = 0;
620
621 seq_printf(m, "%d %d:", ug->uid, glen);
622 for (i = 0; i < glen; i++)
623 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
624 seq_printf(m, "\n");
625 return 0;
626 }
627
628 struct cache_detail unix_gid_cache = {
629 .owner = THIS_MODULE,
630 .hash_size = GID_HASHMAX,
631 .hash_table = gid_table,
632 .name = "auth.unix.gid",
633 .cache_put = unix_gid_put,
634 .cache_request = unix_gid_request,
635 .cache_parse = unix_gid_parse,
636 .cache_show = unix_gid_show,
637 .match = unix_gid_match,
638 .init = unix_gid_init,
639 .update = unix_gid_update,
640 .alloc = unix_gid_alloc,
641 };
642
643 static struct unix_gid *unix_gid_lookup(uid_t uid)
644 {
645 struct unix_gid ug;
646 struct cache_head *ch;
647
648 ug.uid = uid;
649 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
650 hash_long(uid, GID_HASHBITS));
651 if (ch)
652 return container_of(ch, struct unix_gid, h);
653 else
654 return NULL;
655 }
656
657 static int unix_gid_find(uid_t uid, struct group_info **gip,
658 struct svc_rqst *rqstp)
659 {
660 struct unix_gid *ug = unix_gid_lookup(uid);
661 if (!ug)
662 return -EAGAIN;
663 switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
664 case -ENOENT:
665 *gip = NULL;
666 return 0;
667 case 0:
668 *gip = ug->gi;
669 get_group_info(*gip);
670 return 0;
671 default:
672 return -EAGAIN;
673 }
674 }
675
676 int
677 svcauth_unix_set_client(struct svc_rqst *rqstp)
678 {
679 struct sockaddr_in *sin;
680 struct sockaddr_in6 *sin6, sin6_storage;
681 struct ip_map *ipm;
682
683 switch (rqstp->rq_addr.ss_family) {
684 case AF_INET:
685 sin = svc_addr_in(rqstp);
686 sin6 = &sin6_storage;
687 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
688 htonl(0x0000FFFF), sin->sin_addr.s_addr);
689 break;
690 case AF_INET6:
691 sin6 = svc_addr_in6(rqstp);
692 break;
693 default:
694 BUG();
695 }
696
697 rqstp->rq_client = NULL;
698 if (rqstp->rq_proc == 0)
699 return SVC_OK;
700
701 ipm = ip_map_cached_get(rqstp);
702 if (ipm == NULL)
703 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
704 &sin6->sin6_addr);
705
706 if (ipm == NULL)
707 return SVC_DENIED;
708
709 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
710 default:
711 BUG();
712 case -EAGAIN:
713 case -ETIMEDOUT:
714 return SVC_DROP;
715 case -ENOENT:
716 return SVC_DENIED;
717 case 0:
718 rqstp->rq_client = &ipm->m_client->h;
719 kref_get(&rqstp->rq_client->ref);
720 ip_map_cached_put(rqstp, ipm);
721 break;
722 }
723 return SVC_OK;
724 }
725
726 EXPORT_SYMBOL(svcauth_unix_set_client);
727
728 static int
729 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
730 {
731 struct kvec *argv = &rqstp->rq_arg.head[0];
732 struct kvec *resv = &rqstp->rq_res.head[0];
733 struct svc_cred *cred = &rqstp->rq_cred;
734
735 cred->cr_group_info = NULL;
736 rqstp->rq_client = NULL;
737
738 if (argv->iov_len < 3*4)
739 return SVC_GARBAGE;
740
741 if (svc_getu32(argv) != 0) {
742 dprintk("svc: bad null cred\n");
743 *authp = rpc_autherr_badcred;
744 return SVC_DENIED;
745 }
746 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
747 dprintk("svc: bad null verf\n");
748 *authp = rpc_autherr_badverf;
749 return SVC_DENIED;
750 }
751
752 /* Signal that mapping to nobody uid/gid is required */
753 cred->cr_uid = (uid_t) -1;
754 cred->cr_gid = (gid_t) -1;
755 cred->cr_group_info = groups_alloc(0);
756 if (cred->cr_group_info == NULL)
757 return SVC_DROP; /* kmalloc failure - client must retry */
758
759 /* Put NULL verifier */
760 svc_putnl(resv, RPC_AUTH_NULL);
761 svc_putnl(resv, 0);
762
763 rqstp->rq_flavor = RPC_AUTH_NULL;
764 return SVC_OK;
765 }
766
767 static int
768 svcauth_null_release(struct svc_rqst *rqstp)
769 {
770 if (rqstp->rq_client)
771 auth_domain_put(rqstp->rq_client);
772 rqstp->rq_client = NULL;
773 if (rqstp->rq_cred.cr_group_info)
774 put_group_info(rqstp->rq_cred.cr_group_info);
775 rqstp->rq_cred.cr_group_info = NULL;
776
777 return 0; /* don't drop */
778 }
779
780
781 struct auth_ops svcauth_null = {
782 .name = "null",
783 .owner = THIS_MODULE,
784 .flavour = RPC_AUTH_NULL,
785 .accept = svcauth_null_accept,
786 .release = svcauth_null_release,
787 .set_client = svcauth_unix_set_client,
788 };
789
790
791 static int
792 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
793 {
794 struct kvec *argv = &rqstp->rq_arg.head[0];
795 struct kvec *resv = &rqstp->rq_res.head[0];
796 struct svc_cred *cred = &rqstp->rq_cred;
797 u32 slen, i;
798 int len = argv->iov_len;
799
800 cred->cr_group_info = NULL;
801 rqstp->rq_client = NULL;
802
803 if ((len -= 3*4) < 0)
804 return SVC_GARBAGE;
805
806 svc_getu32(argv); /* length */
807 svc_getu32(argv); /* time stamp */
808 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
809 if (slen > 64 || (len -= (slen + 3)*4) < 0)
810 goto badcred;
811 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
812 argv->iov_len -= slen*4;
813
814 cred->cr_uid = svc_getnl(argv); /* uid */
815 cred->cr_gid = svc_getnl(argv); /* gid */
816 slen = svc_getnl(argv); /* gids length */
817 if (slen > 16 || (len -= (slen + 2)*4) < 0)
818 goto badcred;
819 if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
820 == -EAGAIN)
821 return SVC_DROP;
822 if (cred->cr_group_info == NULL) {
823 cred->cr_group_info = groups_alloc(slen);
824 if (cred->cr_group_info == NULL)
825 return SVC_DROP;
826 for (i = 0; i < slen; i++)
827 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
828 } else {
829 for (i = 0; i < slen ; i++)
830 svc_getnl(argv);
831 }
832 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
833 *authp = rpc_autherr_badverf;
834 return SVC_DENIED;
835 }
836
837 /* Put NULL verifier */
838 svc_putnl(resv, RPC_AUTH_NULL);
839 svc_putnl(resv, 0);
840
841 rqstp->rq_flavor = RPC_AUTH_UNIX;
842 return SVC_OK;
843
844 badcred:
845 *authp = rpc_autherr_badcred;
846 return SVC_DENIED;
847 }
848
849 static int
850 svcauth_unix_release(struct svc_rqst *rqstp)
851 {
852 /* Verifier (such as it is) is already in place.
853 */
854 if (rqstp->rq_client)
855 auth_domain_put(rqstp->rq_client);
856 rqstp->rq_client = NULL;
857 if (rqstp->rq_cred.cr_group_info)
858 put_group_info(rqstp->rq_cred.cr_group_info);
859 rqstp->rq_cred.cr_group_info = NULL;
860
861 return 0;
862 }
863
864
865 struct auth_ops svcauth_unix = {
866 .name = "unix",
867 .owner = THIS_MODULE,
868 .flavour = RPC_AUTH_UNIX,
869 .accept = svcauth_unix_accept,
870 .release = svcauth_unix_release,
871 .domain_release = svcauth_unix_domain_release,
872 .set_client = svcauth_unix_set_client,
873 };
874
Linux kernel - Deliverables
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