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[PATCH] type fix in arm/boot/compressed/misc.c
[wrt350n-kernel.git] / net / sunrpc / svcauth_unix.c
blobcac2e774dd813669d810f464a2263f2c08354a6a
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 struct auth_domain *unix_domain_find(char *name)
31 {
32 struct auth_domain *rv, ud;
33 struct unix_domain *new;
34
35 ud.name = name;
36
37 rv = auth_domain_lookup(&ud, 0);
38
39 foundit:
40 if (rv && rv->flavour != RPC_AUTH_UNIX) {
41 auth_domain_put(rv);
42 return NULL;
43 }
44 if (rv)
45 return rv;
46
47 new = kmalloc(sizeof(*new), GFP_KERNEL);
48 if (new == NULL)
49 return NULL;
50 cache_init(&new->h.h);
51 new->h.name = kstrdup(name, GFP_KERNEL);
52 new->h.flavour = RPC_AUTH_UNIX;
53 new->addr_changes = 0;
54 new->h.h.expiry_time = NEVER;
55
56 rv = auth_domain_lookup(&new->h, 2);
57 if (rv == &new->h) {
58 if (atomic_dec_and_test(&new->h.h.refcnt)) BUG();
59 } else {
60 auth_domain_put(&new->h);
61 goto foundit;
62 }
63
64 return rv;
65 }
66
67 static void svcauth_unix_domain_release(struct auth_domain *dom)
68 {
69 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
70
71 kfree(dom->name);
72 kfree(ud);
73 }
74
75
76 /**************************************************
77 * cache for IP address to unix_domain
78 * as needed by AUTH_UNIX
79 */
80 #define IP_HASHBITS 8
81 #define IP_HASHMAX (1<<IP_HASHBITS)
82 #define IP_HASHMASK (IP_HASHMAX-1)
83
84 struct ip_map {
85 struct cache_head h;
86 char m_class[8]; /* e.g. "nfsd" */
87 struct in_addr m_addr;
88 struct unix_domain *m_client;
89 int m_add_change;
90 };
91 static struct cache_head *ip_table[IP_HASHMAX];
92
93 static void ip_map_put(struct cache_head *item, struct cache_detail *cd)
94 {
95 struct ip_map *im = container_of(item, struct ip_map,h);
96 if (cache_put(item, cd)) {
97 if (test_bit(CACHE_VALID, &item->flags) &&
98 !test_bit(CACHE_NEGATIVE, &item->flags))
99 auth_domain_put(&im->m_client->h);
100 kfree(im);
101 }
102 }
103
104 static inline int ip_map_hash(struct ip_map *item)
105 {
106 return hash_str(item->m_class, IP_HASHBITS) ^
107 hash_long((unsigned long)item->m_addr.s_addr, IP_HASHBITS);
108 }
109 static inline int ip_map_match(struct ip_map *item, struct ip_map *tmp)
110 {
111 return strcmp(tmp->m_class, item->m_class) == 0
112 && tmp->m_addr.s_addr == item->m_addr.s_addr;
113 }
114 static inline void ip_map_init(struct ip_map *new, struct ip_map *item)
115 {
116 strcpy(new->m_class, item->m_class);
117 new->m_addr.s_addr = item->m_addr.s_addr;
118 }
119 static inline void ip_map_update(struct ip_map *new, struct ip_map *item)
120 {
121 cache_get(&item->m_client->h.h);
122 new->m_client = item->m_client;
123 new->m_add_change = item->m_add_change;
124 }
125
126 static void ip_map_request(struct cache_detail *cd,
127 struct cache_head *h,
128 char **bpp, int *blen)
129 {
130 char text_addr[20];
131 struct ip_map *im = container_of(h, struct ip_map, h);
132 __u32 addr = im->m_addr.s_addr;
133
134 snprintf(text_addr, 20, "%u.%u.%u.%u",
135 ntohl(addr) >> 24 & 0xff,
136 ntohl(addr) >> 16 & 0xff,
137 ntohl(addr) >> 8 & 0xff,
138 ntohl(addr) >> 0 & 0xff);
139
140 qword_add(bpp, blen, im->m_class);
141 qword_add(bpp, blen, text_addr);
142 (*bpp)[-1] = '\n';
143 }
144
145 static struct ip_map *ip_map_lookup(struct ip_map *, int);
146
147 static int ip_map_parse(struct cache_detail *cd,
148 char *mesg, int mlen)
149 {
150 /* class ipaddress [domainname] */
151 /* should be safe just to use the start of the input buffer
152 * for scratch: */
153 char *buf = mesg;
154 int len;
155 int b1,b2,b3,b4;
156 char c;
157 struct ip_map ipm, *ipmp;
158 struct auth_domain *dom;
159 time_t expiry;
160
161 if (mesg[mlen-1] != '\n')
162 return -EINVAL;
163 mesg[mlen-1] = 0;
164
165 /* class */
166 len = qword_get(&mesg, ipm.m_class, sizeof(ipm.m_class));
167 if (len <= 0) return -EINVAL;
168
169 /* ip address */
170 len = qword_get(&mesg, buf, mlen);
171 if (len <= 0) return -EINVAL;
172
173 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
174 return -EINVAL;
175
176 expiry = get_expiry(&mesg);
177 if (expiry ==0)
178 return -EINVAL;
179
180 /* domainname, or empty for NEGATIVE */
181 len = qword_get(&mesg, buf, mlen);
182 if (len < 0) return -EINVAL;
183
184 if (len) {
185 dom = unix_domain_find(buf);
186 if (dom == NULL)
187 return -ENOENT;
188 } else
189 dom = NULL;
190
191 ipm.m_addr.s_addr =
192 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
193 ipm.h.flags = 0;
194 if (dom) {
195 ipm.m_client = container_of(dom, struct unix_domain, h);
196 ipm.m_add_change = ipm.m_client->addr_changes;
197 } else
198 set_bit(CACHE_NEGATIVE, &ipm.h.flags);
199 ipm.h.expiry_time = expiry;
200
201 ipmp = ip_map_lookup(&ipm, 1);
202 if (ipmp)
203 ip_map_put(&ipmp->h, &ip_map_cache);
204 if (dom)
205 auth_domain_put(dom);
206 if (!ipmp)
207 return -ENOMEM;
208 cache_flush();
209 return 0;
210 }
211
212 static int ip_map_show(struct seq_file *m,
213 struct cache_detail *cd,
214 struct cache_head *h)
215 {
216 struct ip_map *im;
217 struct in_addr addr;
218 char *dom = "-no-domain-";
219
220 if (h == NULL) {
221 seq_puts(m, "#class IP domain\n");
222 return 0;
223 }
224 im = container_of(h, struct ip_map, h);
225 /* class addr domain */
226 addr = im->m_addr;
227
228 if (test_bit(CACHE_VALID, &h->flags) &&
229 !test_bit(CACHE_NEGATIVE, &h->flags))
230 dom = im->m_client->h.name;
231
232 seq_printf(m, "%s %d.%d.%d.%d %s\n",
233 im->m_class,
234 htonl(addr.s_addr) >> 24 & 0xff,
235 htonl(addr.s_addr) >> 16 & 0xff,
236 htonl(addr.s_addr) >> 8 & 0xff,
237 htonl(addr.s_addr) >> 0 & 0xff,
238 dom
239 );
240 return 0;
241 }
242
243
244 struct cache_detail ip_map_cache = {
245 .owner = THIS_MODULE,
246 .hash_size = IP_HASHMAX,
247 .hash_table = ip_table,
248 .name = "auth.unix.ip",
249 .cache_put = ip_map_put,
250 .cache_request = ip_map_request,
251 .cache_parse = ip_map_parse,
252 .cache_show = ip_map_show,
253 };
254
255 static DefineSimpleCacheLookup(ip_map, 0)
256
257
258 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
259 {
260 struct unix_domain *udom;
261 struct ip_map ip, *ipmp;
262
263 if (dom->flavour != RPC_AUTH_UNIX)
264 return -EINVAL;
265 udom = container_of(dom, struct unix_domain, h);
266 strcpy(ip.m_class, "nfsd");
267 ip.m_addr = addr;
268 ip.m_client = udom;
269 ip.m_add_change = udom->addr_changes+1;
270 ip.h.flags = 0;
271 ip.h.expiry_time = NEVER;
272
273 ipmp = ip_map_lookup(&ip, 1);
274
275 if (ipmp) {
276 ip_map_put(&ipmp->h, &ip_map_cache);
277 return 0;
278 } else
279 return -ENOMEM;
280 }
281
282 int auth_unix_forget_old(struct auth_domain *dom)
283 {
284 struct unix_domain *udom;
285
286 if (dom->flavour != RPC_AUTH_UNIX)
287 return -EINVAL;
288 udom = container_of(dom, struct unix_domain, h);
289 udom->addr_changes++;
290 return 0;
291 }
292
293 struct auth_domain *auth_unix_lookup(struct in_addr addr)
294 {
295 struct ip_map key, *ipm;
296 struct auth_domain *rv;
297
298 strcpy(key.m_class, "nfsd");
299 key.m_addr = addr;
300
301 ipm = ip_map_lookup(&key, 0);
302
303 if (!ipm)
304 return NULL;
305 if (cache_check(&ip_map_cache, &ipm->h, NULL))
306 return NULL;
307
308 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
309 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
310 auth_domain_put(&ipm->m_client->h);
311 rv = NULL;
312 } else {
313 rv = &ipm->m_client->h;
314 cache_get(&rv->h);
315 }
316 ip_map_put(&ipm->h, &ip_map_cache);
317 return rv;
318 }
319
320 void svcauth_unix_purge(void)
321 {
322 cache_purge(&ip_map_cache);
323 cache_purge(&auth_domain_cache);
324 }
325
326 static int
327 svcauth_unix_set_client(struct svc_rqst *rqstp)
328 {
329 struct ip_map key, *ipm;
330
331 rqstp->rq_client = NULL;
332 if (rqstp->rq_proc == 0)
333 return SVC_OK;
334
335 strcpy(key.m_class, rqstp->rq_server->sv_program->pg_class);
336 key.m_addr = rqstp->rq_addr.sin_addr;
337
338 ipm = ip_map_lookup(&key, 0);
339
340 if (ipm == NULL)
341 return SVC_DENIED;
342
343 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
344 default:
345 BUG();
346 case -EAGAIN:
347 return SVC_DROP;
348 case -ENOENT:
349 return SVC_DENIED;
350 case 0:
351 rqstp->rq_client = &ipm->m_client->h;
352 cache_get(&rqstp->rq_client->h);
353 ip_map_put(&ipm->h, &ip_map_cache);
354 break;
355 }
356 return SVC_OK;
357 }
358
359 static int
360 svcauth_null_accept(struct svc_rqst *rqstp, u32 *authp)
361 {
362 struct kvec *argv = &rqstp->rq_arg.head[0];
363 struct kvec *resv = &rqstp->rq_res.head[0];
364 struct svc_cred *cred = &rqstp->rq_cred;
365
366 cred->cr_group_info = NULL;
367 rqstp->rq_client = NULL;
368
369 if (argv->iov_len < 3*4)
370 return SVC_GARBAGE;
371
372 if (svc_getu32(argv) != 0) {
373 dprintk("svc: bad null cred\n");
374 *authp = rpc_autherr_badcred;
375 return SVC_DENIED;
376 }
377 if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
378 dprintk("svc: bad null verf\n");
379 *authp = rpc_autherr_badverf;
380 return SVC_DENIED;
381 }
382
383 /* Signal that mapping to nobody uid/gid is required */
384 cred->cr_uid = (uid_t) -1;
385 cred->cr_gid = (gid_t) -1;
386 cred->cr_group_info = groups_alloc(0);
387 if (cred->cr_group_info == NULL)
388 return SVC_DROP; /* kmalloc failure - client must retry */
389
390 /* Put NULL verifier */
391 svc_putu32(resv, RPC_AUTH_NULL);
392 svc_putu32(resv, 0);
393
394 return SVC_OK;
395 }
396
397 static int
398 svcauth_null_release(struct svc_rqst *rqstp)
399 {
400 if (rqstp->rq_client)
401 auth_domain_put(rqstp->rq_client);
402 rqstp->rq_client = NULL;
403 if (rqstp->rq_cred.cr_group_info)
404 put_group_info(rqstp->rq_cred.cr_group_info);
405 rqstp->rq_cred.cr_group_info = NULL;
406
407 return 0; /* don't drop */
408 }
409
410
411 struct auth_ops svcauth_null = {
412 .name = "null",
413 .owner = THIS_MODULE,
414 .flavour = RPC_AUTH_NULL,
415 .accept = svcauth_null_accept,
416 .release = svcauth_null_release,
417 .set_client = svcauth_unix_set_client,
418 };
419
420
421 static int
422 svcauth_unix_accept(struct svc_rqst *rqstp, u32 *authp)
423 {
424 struct kvec *argv = &rqstp->rq_arg.head[0];
425 struct kvec *resv = &rqstp->rq_res.head[0];
426 struct svc_cred *cred = &rqstp->rq_cred;
427 u32 slen, i;
428 int len = argv->iov_len;
429
430 cred->cr_group_info = NULL;
431 rqstp->rq_client = NULL;
432
433 if ((len -= 3*4) < 0)
434 return SVC_GARBAGE;
435
436 svc_getu32(argv); /* length */
437 svc_getu32(argv); /* time stamp */
438 slen = XDR_QUADLEN(ntohl(svc_getu32(argv))); /* machname length */
439 if (slen > 64 || (len -= (slen + 3)*4) < 0)
440 goto badcred;
441 argv->iov_base = (void*)((u32*)argv->iov_base + slen); /* skip machname */
442 argv->iov_len -= slen*4;
443
444 cred->cr_uid = ntohl(svc_getu32(argv)); /* uid */
445 cred->cr_gid = ntohl(svc_getu32(argv)); /* gid */
446 slen = ntohl(svc_getu32(argv)); /* gids length */
447 if (slen > 16 || (len -= (slen + 2)*4) < 0)
448 goto badcred;
449 cred->cr_group_info = groups_alloc(slen);
450 if (cred->cr_group_info == NULL)
451 return SVC_DROP;
452 for (i = 0; i < slen; i++)
453 GROUP_AT(cred->cr_group_info, i) = ntohl(svc_getu32(argv));
454
455 if (svc_getu32(argv) != RPC_AUTH_NULL || svc_getu32(argv) != 0) {
456 *authp = rpc_autherr_badverf;
457 return SVC_DENIED;
458 }
459
460 /* Put NULL verifier */
461 svc_putu32(resv, RPC_AUTH_NULL);
462 svc_putu32(resv, 0);
463
464 return SVC_OK;
465
466 badcred:
467 *authp = rpc_autherr_badcred;
468 return SVC_DENIED;
469 }
470
471 static int
472 svcauth_unix_release(struct svc_rqst *rqstp)
473 {
474 /* Verifier (such as it is) is already in place.
475 */
476 if (rqstp->rq_client)
477 auth_domain_put(rqstp->rq_client);
478 rqstp->rq_client = NULL;
479 if (rqstp->rq_cred.cr_group_info)
480 put_group_info(rqstp->rq_cred.cr_group_info);
481 rqstp->rq_cred.cr_group_info = NULL;
482
483 return 0;
484 }
485
486
487 struct auth_ops svcauth_unix = {
488 .name = "unix",
489 .owner = THIS_MODULE,
490 .flavour = RPC_AUTH_UNIX,
491 .accept = svcauth_unix_accept,
492 .release = svcauth_unix_release,
493 .domain_release = svcauth_unix_domain_release,
494 .set_client = svcauth_unix_set_client,
495 };
496
WRT350N Kernel Patches