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