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[PATCH] w1: Userspace communication protocol over connector.
[linux-2.6/verdex.git] / net / sunrpc / svcauth_unix.c
blob7e5707e2d6b678fcd00cdb439cceb3b71fee0220
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
13 #define RPCDBG_FACILITY RPCDBG_AUTH
14
15
16 /*
17 * AUTHUNIX and AUTHNULL credentials are both handled here.
18 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
19 * are always nobody (-2). i.e. we do the same IP address checks for
20 * AUTHNULL as for AUTHUNIX, and that is done here.
21 */
22
23
24 struct unix_domain {
25 struct auth_domain h;
26 int addr_changes;
27 /* other stuff later */
28 };
29
30 extern struct auth_ops svcauth_unix;
31
32 struct auth_domain *unix_domain_find(char *name)
33 {
34 struct auth_domain *rv;
35 struct unix_domain *new = NULL;
36
37 rv = auth_domain_lookup(name, NULL);
38 while(1) {
39 if (rv) {
40 if (new && rv != &new->h)
41 auth_domain_put(&new->h);
42
43 if (rv->flavour != &svcauth_unix) {
44 auth_domain_put(rv);
45 return NULL;
46 }
47 return rv;
48 }
49
50 new = kmalloc(sizeof(*new), GFP_KERNEL);
51 if (new == NULL)
52 return NULL;
53 kref_init(&new->h.ref);
54 new->h.name = kstrdup(name, GFP_KERNEL);
55 new->h.flavour = &svcauth_unix;
56 new->addr_changes = 0;
57 rv = auth_domain_lookup(name, &new->h);
58 }
59 }
60
61 static void svcauth_unix_domain_release(struct auth_domain *dom)
62 {
63 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
64
65 kfree(dom->name);
66 kfree(ud);
67 }
68
69
70 /**************************************************
71 * cache for IP address to unix_domain
72 * as needed by AUTH_UNIX
73 */
74 #define IP_HASHBITS 8
75 #define IP_HASHMAX (1<<IP_HASHBITS)
76 #define IP_HASHMASK (IP_HASHMAX-1)
77
78 struct ip_map {
79 struct cache_head h;
80 char m_class[8]; /* e.g. "nfsd" */
81 struct in_addr m_addr;
82 struct unix_domain *m_client;
83 int m_add_change;
84 };
85 static struct cache_head *ip_table[IP_HASHMAX];
86
87 static void ip_map_put(struct kref *kref)
88 {
89 struct cache_head *item = container_of(kref, struct cache_head, ref);
90 struct ip_map *im = container_of(item, struct ip_map,h);
91
92 if (test_bit(CACHE_VALID, &item->flags) &&
93 !test_bit(CACHE_NEGATIVE, &item->flags))
94 auth_domain_put(&im->m_client->h);
95 kfree(im);
96 }
97
98 #if IP_HASHBITS == 8
99 /* hash_long on a 64 bit machine is currently REALLY BAD for
100 * IP addresses in reverse-endian (i.e. on a little-endian machine).
101 * So use a trivial but reliable hash instead
102 */
103 static inline int hash_ip(unsigned long ip)
104 {
105 int hash = ip ^ (ip>>16);
106 return (hash ^ (hash>>8)) & 0xff;
107 }
108 #endif
109 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
110 {
111 struct ip_map *orig = container_of(corig, struct ip_map, h);
112 struct ip_map *new = container_of(cnew, struct ip_map, h);
113 return strcmp(orig->m_class, new->m_class) == 0
114 && orig->m_addr.s_addr == new->m_addr.s_addr;
115 }
116 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
117 {
118 struct ip_map *new = container_of(cnew, struct ip_map, h);
119 struct ip_map *item = container_of(citem, struct ip_map, h);
120
121 strcpy(new->m_class, item->m_class);
122 new->m_addr.s_addr = item->m_addr.s_addr;
123 }
124 static void update(struct cache_head *cnew, struct cache_head *citem)
125 {
126 struct ip_map *new = container_of(cnew, struct ip_map, h);
127 struct ip_map *item = container_of(citem, struct ip_map, h);
128
129 kref_get(&item->m_client->h.ref);
130 new->m_client = item->m_client;
131 new->m_add_change = item->m_add_change;
132 }
133 static struct cache_head *ip_map_alloc(void)
134 {
135 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
136 if (i)
137 return &i->h;
138 else
139 return NULL;
140 }
141
142 static void ip_map_request(struct cache_detail *cd,
143 struct cache_head *h,
144 char **bpp, int *blen)
145 {
146 char text_addr[20];
147 struct ip_map *im = container_of(h, struct ip_map, h);
148 __u32 addr = im->m_addr.s_addr;
149
150 snprintf(text_addr, 20, "%u.%u.%u.%u",
151 ntohl(addr) >> 24 & 0xff,
152 ntohl(addr) >> 16 & 0xff,
153 ntohl(addr) >> 8 & 0xff,
154 ntohl(addr) >> 0 & 0xff);
155
156 qword_add(bpp, blen, im->m_class);
157 qword_add(bpp, blen, text_addr);
158 (*bpp)[-1] = '\n';
159 }
160
161 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
162 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
163
164 static int ip_map_parse(struct cache_detail *cd,
165 char *mesg, int mlen)
166 {
167 /* class ipaddress [domainname] */
168 /* should be safe just to use the start of the input buffer
169 * for scratch: */
170 char *buf = mesg;
171 int len;
172 int b1,b2,b3,b4;
173 char c;
174 char class[8];
175 struct in_addr addr;
176 int err;
177
178 struct ip_map *ipmp;
179 struct auth_domain *dom;
180 time_t expiry;
181
182 if (mesg[mlen-1] != '\n')
183 return -EINVAL;
184 mesg[mlen-1] = 0;
185
186 /* class */
187 len = qword_get(&mesg, class, sizeof(class));
188 if (len <= 0) return -EINVAL;
189
190 /* ip address */
191 len = qword_get(&mesg, buf, mlen);
192 if (len <= 0) return -EINVAL;
193
194 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
195 return -EINVAL;
196
197 expiry = get_expiry(&mesg);
198 if (expiry ==0)
199 return -EINVAL;
200
201 /* domainname, or empty for NEGATIVE */
202 len = qword_get(&mesg, buf, mlen);
203 if (len < 0) return -EINVAL;
204
205 if (len) {
206 dom = unix_domain_find(buf);
207 if (dom == NULL)
208 return -ENOENT;
209 } else
210 dom = NULL;
211
212 addr.s_addr =
213 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
214
215 ipmp = ip_map_lookup(class,addr);
216 if (ipmp) {
217 err = ip_map_update(ipmp,
218 container_of(dom, struct unix_domain, h),
219 expiry);
220 } else
221 err = -ENOMEM;
222
223 if (dom)
224 auth_domain_put(dom);
225
226 cache_flush();
227 return err;
228 }
229
230 static int ip_map_show(struct seq_file *m,
231 struct cache_detail *cd,
232 struct cache_head *h)
233 {
234 struct ip_map *im;
235 struct in_addr addr;
236 char *dom = "-no-domain-";
237
238 if (h == NULL) {
239 seq_puts(m, "#class IP domain\n");
240 return 0;
241 }
242 im = container_of(h, struct ip_map, h);
243 /* class addr domain */
244 addr = im->m_addr;
245
246 if (test_bit(CACHE_VALID, &h->flags) &&
247 !test_bit(CACHE_NEGATIVE, &h->flags))
248 dom = im->m_client->h.name;
249
250 seq_printf(m, "%s %d.%d.%d.%d %s\n",
251 im->m_class,
252 htonl(addr.s_addr) >> 24 & 0xff,
253 htonl(addr.s_addr) >> 16 & 0xff,
254 htonl(addr.s_addr) >> 8 & 0xff,
255 htonl(addr.s_addr) >> 0 & 0xff,
256 dom
257 );
258 return 0;
259 }
260
261
262 struct cache_detail ip_map_cache = {
263 .owner = THIS_MODULE,
264 .hash_size = IP_HASHMAX,
265 .hash_table = ip_table,
266 .name = "auth.unix.ip",
267 .cache_put = ip_map_put,
268 .cache_request = ip_map_request,
269 .cache_parse = ip_map_parse,
270 .cache_show = ip_map_show,
271 .match = ip_map_match,
272 .init = ip_map_init,
273 .update = update,
274 .alloc = ip_map_alloc,
275 };
276
277 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
278 {
279 struct ip_map ip;
280 struct cache_head *ch;
281
282 strcpy(ip.m_class, class);
283 ip.m_addr = addr;
284 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
285 hash_str(class, IP_HASHBITS) ^
286 hash_ip((unsigned long)addr.s_addr));
287
288 if (ch)
289 return container_of(ch, struct ip_map, h);
290 else
291 return NULL;
292 }
293
294 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
295 {
296 struct ip_map ip;
297 struct cache_head *ch;
298
299 ip.m_client = udom;
300 ip.h.flags = 0;
301 if (!udom)
302 set_bit(CACHE_NEGATIVE, &ip.h.flags);
303 else {
304 ip.m_add_change = udom->addr_changes;
305 /* if this is from the legacy set_client system call,
306 * we need m_add_change to be one higher
307 */
308 if (expiry == NEVER)
309 ip.m_add_change++;
310 }
311 ip.h.expiry_time = expiry;
312 ch = sunrpc_cache_update(&ip_map_cache,
313 &ip.h, &ipm->h,
314 hash_str(ipm->m_class, IP_HASHBITS) ^
315 hash_ip((unsigned long)ipm->m_addr.s_addr));
316 if (!ch)
317 return -ENOMEM;
318 cache_put(ch, &ip_map_cache);
319 return 0;
320 }
321
322 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
323 {
324 struct unix_domain *udom;
325 struct ip_map *ipmp;
326
327 if (dom->flavour != &svcauth_unix)
328 return -EINVAL;
329 udom = container_of(dom, struct unix_domain, h);
330 ipmp = ip_map_lookup("nfsd", addr);
331
332 if (ipmp)
333 return ip_map_update(ipmp, udom, NEVER);
334 else
335 return -ENOMEM;
336 }
337
338 int auth_unix_forget_old(struct auth_domain *dom)
339 {
340 struct unix_domain *udom;
341
342 if (dom->flavour != &svcauth_unix)
343 return -EINVAL;
344 udom = container_of(dom, struct unix_domain, h);
345 udom->addr_changes++;
346 return 0;
347 }
348
349 struct auth_domain *auth_unix_lookup(struct in_addr addr)
350 {
351 struct ip_map key, *ipm;
352 struct auth_domain *rv;
353
354 strcpy(key.m_class, "nfsd");
355 key.m_addr = addr;
356
357 ipm = ip_map_lookup("nfsd", addr);
358
359 if (!ipm)
360 return NULL;
361 if (cache_check(&ip_map_cache, &ipm->h, NULL))
362 return NULL;
363
364 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
365 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
366 auth_domain_put(&ipm->m_client->h);
367 rv = NULL;
368 } else {
369 rv = &ipm->m_client->h;
370 kref_get(&rv->ref);
371 }
372 cache_put(&ipm->h, &ip_map_cache);
373 return rv;
374 }
375
376 void svcauth_unix_purge(void)
377 {
378 cache_purge(&ip_map_cache);
379 }
380
381 static int
382 svcauth_unix_set_client(struct svc_rqst *rqstp)
383 {
384 struct ip_map *ipm;
385
386 rqstp->rq_client = NULL;
387 if (rqstp->rq_proc == 0)
388 return SVC_OK;
389
390 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
391 rqstp->rq_addr.sin_addr);
392
393 if (ipm == NULL)
394 return SVC_DENIED;
395
396 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
397 default:
398 BUG();
399 case -EAGAIN:
400 return SVC_DROP;
401 case -ENOENT:
402 return SVC_DENIED;
403 case 0:
404 rqstp->rq_client = &ipm->m_client->h;
405 kref_get(&rqstp->rq_client->ref);
406 cache_put(&ipm->h, &ip_map_cache);
407 break;
408 }
409 return SVC_OK;
410 }
411
412 static int
413 svcauth_null_accept(struct svc_rqst *rqstp, u32 *authp)
414 {
415 struct kvec *argv = &rqstp->rq_arg.head[0];
416 struct kvec *resv = &rqstp->rq_res.head[0];
417 struct svc_cred *cred = &rqstp->rq_cred;
418
419 cred->cr_group_info = NULL;
420 rqstp->rq_client = NULL;
421
422 if (argv->iov_len < 3*4)
423 return SVC_GARBAGE;
424
425 if (svc_getu32(argv) != 0) {
426 dprintk("svc: bad null cred\n");
427 *authp = rpc_autherr_badcred;
428 return SVC_DENIED;
429 }
430 if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
431 dprintk("svc: bad null verf\n");
432 *authp = rpc_autherr_badverf;
433 return SVC_DENIED;
434 }
435
436 /* Signal that mapping to nobody uid/gid is required */
437 cred->cr_uid = (uid_t) -1;
438 cred->cr_gid = (gid_t) -1;
439 cred->cr_group_info = groups_alloc(0);
440 if (cred->cr_group_info == NULL)
441 return SVC_DROP; /* kmalloc failure - client must retry */
442
443 /* Put NULL verifier */
444 svc_putu32(resv, RPC_AUTH_NULL);
445 svc_putu32(resv, 0);
446
447 return SVC_OK;
448 }
449
450 static int
451 svcauth_null_release(struct svc_rqst *rqstp)
452 {
453 if (rqstp->rq_client)
454 auth_domain_put(rqstp->rq_client);
455 rqstp->rq_client = NULL;
456 if (rqstp->rq_cred.cr_group_info)
457 put_group_info(rqstp->rq_cred.cr_group_info);
458 rqstp->rq_cred.cr_group_info = NULL;
459
460 return 0; /* don't drop */
461 }
462
463
464 struct auth_ops svcauth_null = {
465 .name = "null",
466 .owner = THIS_MODULE,
467 .flavour = RPC_AUTH_NULL,
468 .accept = svcauth_null_accept,
469 .release = svcauth_null_release,
470 .set_client = svcauth_unix_set_client,
471 };
472
473
474 static int
475 svcauth_unix_accept(struct svc_rqst *rqstp, u32 *authp)
476 {
477 struct kvec *argv = &rqstp->rq_arg.head[0];
478 struct kvec *resv = &rqstp->rq_res.head[0];
479 struct svc_cred *cred = &rqstp->rq_cred;
480 u32 slen, i;
481 int len = argv->iov_len;
482
483 cred->cr_group_info = NULL;
484 rqstp->rq_client = NULL;
485
486 if ((len -= 3*4) < 0)
487 return SVC_GARBAGE;
488
489 svc_getu32(argv); /* length */
490 svc_getu32(argv); /* time stamp */
491 slen = XDR_QUADLEN(ntohl(svc_getu32(argv))); /* machname length */
492 if (slen > 64 || (len -= (slen + 3)*4) < 0)
493 goto badcred;
494 argv->iov_base = (void*)((u32*)argv->iov_base + slen); /* skip machname */
495 argv->iov_len -= slen*4;
496
497 cred->cr_uid = ntohl(svc_getu32(argv)); /* uid */
498 cred->cr_gid = ntohl(svc_getu32(argv)); /* gid */
499 slen = ntohl(svc_getu32(argv)); /* gids length */
500 if (slen > 16 || (len -= (slen + 2)*4) < 0)
501 goto badcred;
502 cred->cr_group_info = groups_alloc(slen);
503 if (cred->cr_group_info == NULL)
504 return SVC_DROP;
505 for (i = 0; i < slen; i++)
506 GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv));
507
508 if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
509 *authp = rpc_autherr_badverf;
510 return SVC_DENIED;
511 }
512
513 /* Put NULL verifier */
514 svc_putu32(resv, RPC_AUTH_NULL);
515 svc_putu32(resv, 0);
516
517 return SVC_OK;
518
519 badcred:
520 *authp = rpc_autherr_badcred;
521 return SVC_DENIED;
522 }
523
524 static int
525 svcauth_unix_release(struct svc_rqst *rqstp)
526 {
527 /* Verifier (such as it is) is already in place.
528 */
529 if (rqstp->rq_client)
530 auth_domain_put(rqstp->rq_client);
531 rqstp->rq_client = NULL;
532 if (rqstp->rq_cred.cr_group_info)
533 put_group_info(rqstp->rq_cred.cr_group_info);
534 rqstp->rq_cred.cr_group_info = NULL;
535
536 return 0;
537 }
538
539
540 struct auth_ops svcauth_unix = {
541 .name = "unix",
542 .owner = THIS_MODULE,
543 .flavour = RPC_AUTH_UNIX,
544 .accept = svcauth_unix_accept,
545 .release = svcauth_unix_release,
546 .domain_release = svcauth_unix_domain_release,
547 .set_client = svcauth_unix_set_client,
548 };
549
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