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[hh.org.git] / net / sunrpc / svcauth_unix.c
bloba0a953a430c29957e7204b03061da0604d8c4cf5
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/err.h>
9 #include <linux/seq_file.h>
10 #include <linux/hash.h>
11 #include <linux/string.h>
12 #include <net/sock.h>
13
14 #define RPCDBG_FACILITY RPCDBG_AUTH
15
16
17 /*
18 * AUTHUNIX and AUTHNULL credentials are both handled here.
19 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
20 * are always nobody (-2). i.e. we do the same IP address checks for
21 * AUTHNULL as for AUTHUNIX, and that is done here.
22 */
23
24
25 struct unix_domain {
26 struct auth_domain h;
27 int addr_changes;
28 /* other stuff later */
29 };
30
31 extern struct auth_ops svcauth_unix;
32
33 struct auth_domain *unix_domain_find(char *name)
34 {
35 struct auth_domain *rv;
36 struct unix_domain *new = NULL;
37
38 rv = auth_domain_lookup(name, NULL);
39 while(1) {
40 if (rv) {
41 if (new && rv != &new->h)
42 auth_domain_put(&new->h);
43
44 if (rv->flavour != &svcauth_unix) {
45 auth_domain_put(rv);
46 return NULL;
47 }
48 return rv;
49 }
50
51 new = kmalloc(sizeof(*new), GFP_KERNEL);
52 if (new == NULL)
53 return NULL;
54 kref_init(&new->h.ref);
55 new->h.name = kstrdup(name, GFP_KERNEL);
56 new->h.flavour = &svcauth_unix;
57 new->addr_changes = 0;
58 rv = auth_domain_lookup(name, &new->h);
59 }
60 }
61
62 static void svcauth_unix_domain_release(struct auth_domain *dom)
63 {
64 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
65
66 kfree(dom->name);
67 kfree(ud);
68 }
69
70
71 /**************************************************
72 * cache for IP address to unix_domain
73 * as needed by AUTH_UNIX
74 */
75 #define IP_HASHBITS 8
76 #define IP_HASHMAX (1<<IP_HASHBITS)
77 #define IP_HASHMASK (IP_HASHMAX-1)
78
79 struct ip_map {
80 struct cache_head h;
81 char m_class[8]; /* e.g. "nfsd" */
82 struct in_addr m_addr;
83 struct unix_domain *m_client;
84 int m_add_change;
85 };
86 static struct cache_head *ip_table[IP_HASHMAX];
87
88 static void ip_map_put(struct kref *kref)
89 {
90 struct cache_head *item = container_of(kref, struct cache_head, ref);
91 struct ip_map *im = container_of(item, struct ip_map,h);
92
93 if (test_bit(CACHE_VALID, &item->flags) &&
94 !test_bit(CACHE_NEGATIVE, &item->flags))
95 auth_domain_put(&im->m_client->h);
96 kfree(im);
97 }
98
99 #if IP_HASHBITS == 8
100 /* hash_long on a 64 bit machine is currently REALLY BAD for
101 * IP addresses in reverse-endian (i.e. on a little-endian machine).
102 * So use a trivial but reliable hash instead
103 */
104 static inline int hash_ip(__be32 ip)
105 {
106 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
107 return (hash ^ (hash>>8)) & 0xff;
108 }
109 #endif
110 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
111 {
112 struct ip_map *orig = container_of(corig, struct ip_map, h);
113 struct ip_map *new = container_of(cnew, struct ip_map, h);
114 return strcmp(orig->m_class, new->m_class) == 0
115 && orig->m_addr.s_addr == new->m_addr.s_addr;
116 }
117 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
118 {
119 struct ip_map *new = container_of(cnew, struct ip_map, h);
120 struct ip_map *item = container_of(citem, struct ip_map, h);
121
122 strcpy(new->m_class, item->m_class);
123 new->m_addr.s_addr = item->m_addr.s_addr;
124 }
125 static void update(struct cache_head *cnew, struct cache_head *citem)
126 {
127 struct ip_map *new = container_of(cnew, struct ip_map, h);
128 struct ip_map *item = container_of(citem, struct ip_map, h);
129
130 kref_get(&item->m_client->h.ref);
131 new->m_client = item->m_client;
132 new->m_add_change = item->m_add_change;
133 }
134 static struct cache_head *ip_map_alloc(void)
135 {
136 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
137 if (i)
138 return &i->h;
139 else
140 return NULL;
141 }
142
143 static void ip_map_request(struct cache_detail *cd,
144 struct cache_head *h,
145 char **bpp, int *blen)
146 {
147 char text_addr[20];
148 struct ip_map *im = container_of(h, struct ip_map, h);
149 __be32 addr = im->m_addr.s_addr;
150
151 snprintf(text_addr, 20, "%u.%u.%u.%u",
152 ntohl(addr) >> 24 & 0xff,
153 ntohl(addr) >> 16 & 0xff,
154 ntohl(addr) >> 8 & 0xff,
155 ntohl(addr) >> 0 & 0xff);
156
157 qword_add(bpp, blen, im->m_class);
158 qword_add(bpp, blen, text_addr);
159 (*bpp)[-1] = '\n';
160 }
161
162 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
163 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
164
165 static int ip_map_parse(struct cache_detail *cd,
166 char *mesg, int mlen)
167 {
168 /* class ipaddress [domainname] */
169 /* should be safe just to use the start of the input buffer
170 * for scratch: */
171 char *buf = mesg;
172 int len;
173 int b1,b2,b3,b4;
174 char c;
175 char class[8];
176 struct in_addr addr;
177 int err;
178
179 struct ip_map *ipmp;
180 struct auth_domain *dom;
181 time_t expiry;
182
183 if (mesg[mlen-1] != '\n')
184 return -EINVAL;
185 mesg[mlen-1] = 0;
186
187 /* class */
188 len = qword_get(&mesg, class, sizeof(class));
189 if (len <= 0) return -EINVAL;
190
191 /* ip address */
192 len = qword_get(&mesg, buf, mlen);
193 if (len <= 0) return -EINVAL;
194
195 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
196 return -EINVAL;
197
198 expiry = get_expiry(&mesg);
199 if (expiry ==0)
200 return -EINVAL;
201
202 /* domainname, or empty for NEGATIVE */
203 len = qword_get(&mesg, buf, mlen);
204 if (len < 0) return -EINVAL;
205
206 if (len) {
207 dom = unix_domain_find(buf);
208 if (dom == NULL)
209 return -ENOENT;
210 } else
211 dom = NULL;
212
213 addr.s_addr =
214 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
215
216 ipmp = ip_map_lookup(class,addr);
217 if (ipmp) {
218 err = ip_map_update(ipmp,
219 container_of(dom, struct unix_domain, h),
220 expiry);
221 } else
222 err = -ENOMEM;
223
224 if (dom)
225 auth_domain_put(dom);
226
227 cache_flush();
228 return err;
229 }
230
231 static int ip_map_show(struct seq_file *m,
232 struct cache_detail *cd,
233 struct cache_head *h)
234 {
235 struct ip_map *im;
236 struct in_addr addr;
237 char *dom = "-no-domain-";
238
239 if (h == NULL) {
240 seq_puts(m, "#class IP domain\n");
241 return 0;
242 }
243 im = container_of(h, struct ip_map, h);
244 /* class addr domain */
245 addr = im->m_addr;
246
247 if (test_bit(CACHE_VALID, &h->flags) &&
248 !test_bit(CACHE_NEGATIVE, &h->flags))
249 dom = im->m_client->h.name;
250
251 seq_printf(m, "%s %d.%d.%d.%d %s\n",
252 im->m_class,
253 ntohl(addr.s_addr) >> 24 & 0xff,
254 ntohl(addr.s_addr) >> 16 & 0xff,
255 ntohl(addr.s_addr) >> 8 & 0xff,
256 ntohl(addr.s_addr) >> 0 & 0xff,
257 dom
258 );
259 return 0;
260 }
261
262
263 struct cache_detail ip_map_cache = {
264 .owner = THIS_MODULE,
265 .hash_size = IP_HASHMAX,
266 .hash_table = ip_table,
267 .name = "auth.unix.ip",
268 .cache_put = ip_map_put,
269 .cache_request = ip_map_request,
270 .cache_parse = ip_map_parse,
271 .cache_show = ip_map_show,
272 .match = ip_map_match,
273 .init = ip_map_init,
274 .update = update,
275 .alloc = ip_map_alloc,
276 };
277
278 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
279 {
280 struct ip_map ip;
281 struct cache_head *ch;
282
283 strcpy(ip.m_class, class);
284 ip.m_addr = addr;
285 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
286 hash_str(class, IP_HASHBITS) ^
287 hash_ip(addr.s_addr));
288
289 if (ch)
290 return container_of(ch, struct ip_map, h);
291 else
292 return NULL;
293 }
294
295 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
296 {
297 struct ip_map ip;
298 struct cache_head *ch;
299
300 ip.m_client = udom;
301 ip.h.flags = 0;
302 if (!udom)
303 set_bit(CACHE_NEGATIVE, &ip.h.flags);
304 else {
305 ip.m_add_change = udom->addr_changes;
306 /* if this is from the legacy set_client system call,
307 * we need m_add_change to be one higher
308 */
309 if (expiry == NEVER)
310 ip.m_add_change++;
311 }
312 ip.h.expiry_time = expiry;
313 ch = sunrpc_cache_update(&ip_map_cache,
314 &ip.h, &ipm->h,
315 hash_str(ipm->m_class, IP_HASHBITS) ^
316 hash_ip(ipm->m_addr.s_addr));
317 if (!ch)
318 return -ENOMEM;
319 cache_put(ch, &ip_map_cache);
320 return 0;
321 }
322
323 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
324 {
325 struct unix_domain *udom;
326 struct ip_map *ipmp;
327
328 if (dom->flavour != &svcauth_unix)
329 return -EINVAL;
330 udom = container_of(dom, struct unix_domain, h);
331 ipmp = ip_map_lookup("nfsd", addr);
332
333 if (ipmp)
334 return ip_map_update(ipmp, udom, NEVER);
335 else
336 return -ENOMEM;
337 }
338
339 int auth_unix_forget_old(struct auth_domain *dom)
340 {
341 struct unix_domain *udom;
342
343 if (dom->flavour != &svcauth_unix)
344 return -EINVAL;
345 udom = container_of(dom, struct unix_domain, h);
346 udom->addr_changes++;
347 return 0;
348 }
349
350 struct auth_domain *auth_unix_lookup(struct in_addr addr)
351 {
352 struct ip_map *ipm;
353 struct auth_domain *rv;
354
355 ipm = ip_map_lookup("nfsd", addr);
356
357 if (!ipm)
358 return NULL;
359 if (cache_check(&ip_map_cache, &ipm->h, NULL))
360 return NULL;
361
362 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
363 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
364 auth_domain_put(&ipm->m_client->h);
365 rv = NULL;
366 } else {
367 rv = &ipm->m_client->h;
368 kref_get(&rv->ref);
369 }
370 cache_put(&ipm->h, &ip_map_cache);
371 return rv;
372 }
373
374 void svcauth_unix_purge(void)
375 {
376 cache_purge(&ip_map_cache);
377 }
378
379 static inline struct ip_map *
380 ip_map_cached_get(struct svc_rqst *rqstp)
381 {
382 struct ip_map *ipm = rqstp->rq_sock->sk_info_authunix;
383 if (ipm != NULL) {
384 if (!cache_valid(&ipm->h)) {
385 /*
386 * The entry has been invalidated since it was
387 * remembered, e.g. by a second mount from the
388 * same IP address.
389 */
390 rqstp->rq_sock->sk_info_authunix = NULL;
391 cache_put(&ipm->h, &ip_map_cache);
392 return NULL;
393 }
394 cache_get(&ipm->h);
395 }
396 return ipm;
397 }
398
399 static inline void
400 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
401 {
402 struct svc_sock *svsk = rqstp->rq_sock;
403
404 if (svsk->sk_sock->type == SOCK_STREAM && svsk->sk_info_authunix == NULL)
405 svsk->sk_info_authunix = ipm; /* newly cached, keep the reference */
406 else
407 cache_put(&ipm->h, &ip_map_cache);
408 }
409
410 void
411 svcauth_unix_info_release(void *info)
412 {
413 struct ip_map *ipm = info;
414 cache_put(&ipm->h, &ip_map_cache);
415 }
416
417 static int
418 svcauth_unix_set_client(struct svc_rqst *rqstp)
419 {
420 struct ip_map *ipm;
421
422 rqstp->rq_client = NULL;
423 if (rqstp->rq_proc == 0)
424 return SVC_OK;
425
426 ipm = ip_map_cached_get(rqstp);
427 if (ipm == NULL)
428 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
429 rqstp->rq_addr.sin_addr);
430
431 if (ipm == NULL)
432 return SVC_DENIED;
433
434 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
435 default:
436 BUG();
437 case -EAGAIN:
438 return SVC_DROP;
439 case -ENOENT:
440 return SVC_DENIED;
441 case 0:
442 rqstp->rq_client = &ipm->m_client->h;
443 kref_get(&rqstp->rq_client->ref);
444 ip_map_cached_put(rqstp, ipm);
445 break;
446 }
447 return SVC_OK;
448 }
449
450 static int
451 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
452 {
453 struct kvec *argv = &rqstp->rq_arg.head[0];
454 struct kvec *resv = &rqstp->rq_res.head[0];
455 struct svc_cred *cred = &rqstp->rq_cred;
456
457 cred->cr_group_info = NULL;
458 rqstp->rq_client = NULL;
459
460 if (argv->iov_len < 3*4)
461 return SVC_GARBAGE;
462
463 if (svc_getu32(argv) != 0) {
464 dprintk("svc: bad null cred\n");
465 *authp = rpc_autherr_badcred;
466 return SVC_DENIED;
467 }
468 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
469 dprintk("svc: bad null verf\n");
470 *authp = rpc_autherr_badverf;
471 return SVC_DENIED;
472 }
473
474 /* Signal that mapping to nobody uid/gid is required */
475 cred->cr_uid = (uid_t) -1;
476 cred->cr_gid = (gid_t) -1;
477 cred->cr_group_info = groups_alloc(0);
478 if (cred->cr_group_info == NULL)
479 return SVC_DROP; /* kmalloc failure - client must retry */
480
481 /* Put NULL verifier */
482 svc_putnl(resv, RPC_AUTH_NULL);
483 svc_putnl(resv, 0);
484
485 return SVC_OK;
486 }
487
488 static int
489 svcauth_null_release(struct svc_rqst *rqstp)
490 {
491 if (rqstp->rq_client)
492 auth_domain_put(rqstp->rq_client);
493 rqstp->rq_client = NULL;
494 if (rqstp->rq_cred.cr_group_info)
495 put_group_info(rqstp->rq_cred.cr_group_info);
496 rqstp->rq_cred.cr_group_info = NULL;
497
498 return 0; /* don't drop */
499 }
500
501
502 struct auth_ops svcauth_null = {
503 .name = "null",
504 .owner = THIS_MODULE,
505 .flavour = RPC_AUTH_NULL,
506 .accept = svcauth_null_accept,
507 .release = svcauth_null_release,
508 .set_client = svcauth_unix_set_client,
509 };
510
511
512 static int
513 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
514 {
515 struct kvec *argv = &rqstp->rq_arg.head[0];
516 struct kvec *resv = &rqstp->rq_res.head[0];
517 struct svc_cred *cred = &rqstp->rq_cred;
518 u32 slen, i;
519 int len = argv->iov_len;
520
521 cred->cr_group_info = NULL;
522 rqstp->rq_client = NULL;
523
524 if ((len -= 3*4) < 0)
525 return SVC_GARBAGE;
526
527 svc_getu32(argv); /* length */
528 svc_getu32(argv); /* time stamp */
529 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
530 if (slen > 64 || (len -= (slen + 3)*4) < 0)
531 goto badcred;
532 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
533 argv->iov_len -= slen*4;
534
535 cred->cr_uid = svc_getnl(argv); /* uid */
536 cred->cr_gid = svc_getnl(argv); /* gid */
537 slen = svc_getnl(argv); /* gids length */
538 if (slen > 16 || (len -= (slen + 2)*4) < 0)
539 goto badcred;
540 cred->cr_group_info = groups_alloc(slen);
541 if (cred->cr_group_info == NULL)
542 return SVC_DROP;
543 for (i = 0; i < slen; i++)
544 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
545
546 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
547 *authp = rpc_autherr_badverf;
548 return SVC_DENIED;
549 }
550
551 /* Put NULL verifier */
552 svc_putnl(resv, RPC_AUTH_NULL);
553 svc_putnl(resv, 0);
554
555 return SVC_OK;
556
557 badcred:
558 *authp = rpc_autherr_badcred;
559 return SVC_DENIED;
560 }
561
562 static int
563 svcauth_unix_release(struct svc_rqst *rqstp)
564 {
565 /* Verifier (such as it is) is already in place.
566 */
567 if (rqstp->rq_client)
568 auth_domain_put(rqstp->rq_client);
569 rqstp->rq_client = NULL;
570 if (rqstp->rq_cred.cr_group_info)
571 put_group_info(rqstp->rq_cred.cr_group_info);
572 rqstp->rq_cred.cr_group_info = NULL;
573
574 return 0;
575 }
576
577
578 struct auth_ops svcauth_unix = {
579 .name = "unix",
580 .owner = THIS_MODULE,
581 .flavour = RPC_AUTH_UNIX,
582 .accept = svcauth_unix_accept,
583 .release = svcauth_unix_release,
584 .domain_release = svcauth_unix_domain_release,
585 .set_client = svcauth_unix_set_client,
586 };
587
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