blob: 9bae4090254c89f7fb0de7ab25529eac5ea2c90b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Paulo Marques543537b2005-06-23 00:09:02 -070011#include <linux/string.h>
Greg Banks7b2b1fe2006-10-04 02:15:50 -070012#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070025struct unix_domain {
26 struct auth_domain h;
27 int addr_changes;
28 /* other stuff later */
29};
30
NeilBrownefc36aa2006-03-27 01:14:59 -080031extern struct auth_ops svcauth_unix;
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033struct auth_domain *unix_domain_find(char *name)
34{
NeilBrownefc36aa2006-03-27 01:14:59 -080035 struct auth_domain *rv;
36 struct unix_domain *new = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
NeilBrownefc36aa2006-03-27 01:14:59 -080038 rv = auth_domain_lookup(name, NULL);
39 while(1) {
NeilBrownad1b5222006-03-27 01:15:11 -080040 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 }
NeilBrownefc36aa2006-03-27 01:14:59 -080048 return rv;
49 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
NeilBrownefc36aa2006-03-27 01:14:59 -080051 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);
NeilBrowndd08d6e2006-12-13 00:35:44 -080056 if (new->h.name == NULL) {
57 kfree(new);
58 return NULL;
59 }
NeilBrownefc36aa2006-03-27 01:14:59 -080060 new->h.flavour = &svcauth_unix;
61 new->addr_changes = 0;
62 rv = auth_domain_lookup(name, &new->h);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66static void svcauth_unix_domain_release(struct auth_domain *dom)
67{
68 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
69
70 kfree(dom->name);
71 kfree(ud);
72}
73
74
75/**************************************************
76 * cache for IP address to unix_domain
77 * as needed by AUTH_UNIX
78 */
79#define IP_HASHBITS 8
80#define IP_HASHMAX (1<<IP_HASHBITS)
81#define IP_HASHMASK (IP_HASHMAX-1)
82
83struct ip_map {
84 struct cache_head h;
85 char m_class[8]; /* e.g. "nfsd" */
86 struct in_addr m_addr;
87 struct unix_domain *m_client;
88 int m_add_change;
89};
90static struct cache_head *ip_table[IP_HASHMAX];
91
NeilBrownbaab9352006-03-27 01:15:09 -080092static void ip_map_put(struct kref *kref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
NeilBrownbaab9352006-03-27 01:15:09 -080094 struct cache_head *item = container_of(kref, struct cache_head, ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct ip_map *im = container_of(item, struct ip_map,h);
NeilBrownbaab9352006-03-27 01:15:09 -080096
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
NeilBrown1f1e0302006-01-06 00:09:49 -0800103#if IP_HASHBITS == 8
104/* hash_long on a 64 bit machine is currently REALLY BAD for
105 * IP addresses in reverse-endian (i.e. on a little-endian machine).
106 * So use a trivial but reliable hash instead
107 */
Al Viro48061262006-11-08 00:22:34 -0800108static inline int hash_ip(__be32 ip)
NeilBrown1f1e0302006-01-06 00:09:49 -0800109{
Al Viro48061262006-11-08 00:22:34 -0800110 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
NeilBrown1f1e0302006-01-06 00:09:49 -0800111 return (hash ^ (hash>>8)) & 0xff;
112}
113#endif
NeilBrown1a9917c2006-03-27 01:15:02 -0800114static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
115{
116 struct ip_map *orig = container_of(corig, struct ip_map, h);
117 struct ip_map *new = container_of(cnew, struct ip_map, h);
118 return strcmp(orig->m_class, new->m_class) == 0
119 && orig->m_addr.s_addr == new->m_addr.s_addr;
120}
121static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
122{
123 struct ip_map *new = container_of(cnew, struct ip_map, h);
124 struct ip_map *item = container_of(citem, struct ip_map, h);
NeilBrown1f1e0302006-01-06 00:09:49 -0800125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 strcpy(new->m_class, item->m_class);
127 new->m_addr.s_addr = item->m_addr.s_addr;
128}
NeilBrown1a9917c2006-03-27 01:15:02 -0800129static void update(struct cache_head *cnew, struct cache_head *citem)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
NeilBrown1a9917c2006-03-27 01:15:02 -0800131 struct ip_map *new = container_of(cnew, struct ip_map, h);
132 struct ip_map *item = container_of(citem, struct ip_map, h);
133
NeilBrownefc36aa2006-03-27 01:14:59 -0800134 kref_get(&item->m_client->h.ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 new->m_client = item->m_client;
136 new->m_add_change = item->m_add_change;
137}
NeilBrown1a9917c2006-03-27 01:15:02 -0800138static struct cache_head *ip_map_alloc(void)
139{
140 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
141 if (i)
142 return &i->h;
143 else
144 return NULL;
145}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147static void ip_map_request(struct cache_detail *cd,
148 struct cache_head *h,
149 char **bpp, int *blen)
150{
151 char text_addr[20];
152 struct ip_map *im = container_of(h, struct ip_map, h);
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700153 __be32 addr = im->m_addr.s_addr;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 snprintf(text_addr, 20, "%u.%u.%u.%u",
156 ntohl(addr) >> 24 & 0xff,
157 ntohl(addr) >> 16 & 0xff,
158 ntohl(addr) >> 8 & 0xff,
159 ntohl(addr) >> 0 & 0xff);
160
161 qword_add(bpp, blen, im->m_class);
162 qword_add(bpp, blen, text_addr);
163 (*bpp)[-1] = '\n';
164}
165
NeilBrown1a9917c2006-03-27 01:15:02 -0800166static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
167static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169static int ip_map_parse(struct cache_detail *cd,
170 char *mesg, int mlen)
171{
172 /* class ipaddress [domainname] */
173 /* should be safe just to use the start of the input buffer
174 * for scratch: */
175 char *buf = mesg;
176 int len;
177 int b1,b2,b3,b4;
178 char c;
NeilBrown1a9917c2006-03-27 01:15:02 -0800179 char class[8];
180 struct in_addr addr;
181 int err;
182
183 struct ip_map *ipmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 struct auth_domain *dom;
185 time_t expiry;
186
187 if (mesg[mlen-1] != '\n')
188 return -EINVAL;
189 mesg[mlen-1] = 0;
190
191 /* class */
NeilBrown1a9917c2006-03-27 01:15:02 -0800192 len = qword_get(&mesg, class, sizeof(class));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 if (len <= 0) return -EINVAL;
194
195 /* ip address */
196 len = qword_get(&mesg, buf, mlen);
197 if (len <= 0) return -EINVAL;
198
199 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
200 return -EINVAL;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 expiry = get_expiry(&mesg);
203 if (expiry ==0)
204 return -EINVAL;
205
206 /* domainname, or empty for NEGATIVE */
207 len = qword_get(&mesg, buf, mlen);
208 if (len < 0) return -EINVAL;
209
210 if (len) {
211 dom = unix_domain_find(buf);
212 if (dom == NULL)
213 return -ENOENT;
214 } else
215 dom = NULL;
216
NeilBrown1a9917c2006-03-27 01:15:02 -0800217 addr.s_addr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
NeilBrown1a9917c2006-03-27 01:15:02 -0800220 ipmp = ip_map_lookup(class,addr);
221 if (ipmp) {
222 err = ip_map_update(ipmp,
223 container_of(dom, struct unix_domain, h),
224 expiry);
225 } else
226 err = -ENOMEM;
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 if (dom)
229 auth_domain_put(dom);
NeilBrown1a9917c2006-03-27 01:15:02 -0800230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 cache_flush();
NeilBrown1a9917c2006-03-27 01:15:02 -0800232 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
234
235static int ip_map_show(struct seq_file *m,
236 struct cache_detail *cd,
237 struct cache_head *h)
238{
239 struct ip_map *im;
240 struct in_addr addr;
241 char *dom = "-no-domain-";
242
243 if (h == NULL) {
244 seq_puts(m, "#class IP domain\n");
245 return 0;
246 }
247 im = container_of(h, struct ip_map, h);
248 /* class addr domain */
249 addr = im->m_addr;
250
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800251 if (test_bit(CACHE_VALID, &h->flags) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 !test_bit(CACHE_NEGATIVE, &h->flags))
253 dom = im->m_client->h.name;
254
255 seq_printf(m, "%s %d.%d.%d.%d %s\n",
256 im->m_class,
Al Viro753ed902006-09-26 22:30:23 -0700257 ntohl(addr.s_addr) >> 24 & 0xff,
258 ntohl(addr.s_addr) >> 16 & 0xff,
259 ntohl(addr.s_addr) >> 8 & 0xff,
260 ntohl(addr.s_addr) >> 0 & 0xff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 dom
262 );
263 return 0;
264}
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267struct cache_detail ip_map_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700268 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 .hash_size = IP_HASHMAX,
270 .hash_table = ip_table,
271 .name = "auth.unix.ip",
272 .cache_put = ip_map_put,
273 .cache_request = ip_map_request,
274 .cache_parse = ip_map_parse,
275 .cache_show = ip_map_show,
NeilBrown1a9917c2006-03-27 01:15:02 -0800276 .match = ip_map_match,
277 .init = ip_map_init,
278 .update = update,
279 .alloc = ip_map_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280};
281
NeilBrown1a9917c2006-03-27 01:15:02 -0800282static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
283{
284 struct ip_map ip;
285 struct cache_head *ch;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
NeilBrown1a9917c2006-03-27 01:15:02 -0800287 strcpy(ip.m_class, class);
288 ip.m_addr = addr;
289 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
290 hash_str(class, IP_HASHBITS) ^
Al Viro48061262006-11-08 00:22:34 -0800291 hash_ip(addr.s_addr));
NeilBrown1a9917c2006-03-27 01:15:02 -0800292
293 if (ch)
294 return container_of(ch, struct ip_map, h);
295 else
296 return NULL;
297}
298
299static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
300{
301 struct ip_map ip;
302 struct cache_head *ch;
303
304 ip.m_client = udom;
305 ip.h.flags = 0;
306 if (!udom)
307 set_bit(CACHE_NEGATIVE, &ip.h.flags);
308 else {
309 ip.m_add_change = udom->addr_changes;
310 /* if this is from the legacy set_client system call,
311 * we need m_add_change to be one higher
312 */
313 if (expiry == NEVER)
314 ip.m_add_change++;
315 }
316 ip.h.expiry_time = expiry;
317 ch = sunrpc_cache_update(&ip_map_cache,
318 &ip.h, &ipm->h,
319 hash_str(ipm->m_class, IP_HASHBITS) ^
Al Viro48061262006-11-08 00:22:34 -0800320 hash_ip(ipm->m_addr.s_addr));
NeilBrown1a9917c2006-03-27 01:15:02 -0800321 if (!ch)
322 return -ENOMEM;
NeilBrownbaab9352006-03-27 01:15:09 -0800323 cache_put(ch, &ip_map_cache);
NeilBrown1a9917c2006-03-27 01:15:02 -0800324 return 0;
325}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
328{
329 struct unix_domain *udom;
NeilBrown1a9917c2006-03-27 01:15:02 -0800330 struct ip_map *ipmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
NeilBrownefc36aa2006-03-27 01:14:59 -0800332 if (dom->flavour != &svcauth_unix)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return -EINVAL;
334 udom = container_of(dom, struct unix_domain, h);
NeilBrown1a9917c2006-03-27 01:15:02 -0800335 ipmp = ip_map_lookup("nfsd", addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
NeilBrown1a9917c2006-03-27 01:15:02 -0800337 if (ipmp)
338 return ip_map_update(ipmp, udom, NEVER);
339 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 return -ENOMEM;
341}
342
343int auth_unix_forget_old(struct auth_domain *dom)
344{
345 struct unix_domain *udom;
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800346
NeilBrownefc36aa2006-03-27 01:14:59 -0800347 if (dom->flavour != &svcauth_unix)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 return -EINVAL;
349 udom = container_of(dom, struct unix_domain, h);
350 udom->addr_changes++;
351 return 0;
352}
353
354struct auth_domain *auth_unix_lookup(struct in_addr addr)
355{
Greg Banks40f10522006-10-02 02:17:43 -0700356 struct ip_map *ipm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 struct auth_domain *rv;
358
NeilBrown1a9917c2006-03-27 01:15:02 -0800359 ipm = ip_map_lookup("nfsd", addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 if (!ipm)
362 return NULL;
363 if (cache_check(&ip_map_cache, &ipm->h, NULL))
364 return NULL;
365
366 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
367 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
368 auth_domain_put(&ipm->m_client->h);
369 rv = NULL;
370 } else {
371 rv = &ipm->m_client->h;
NeilBrownefc36aa2006-03-27 01:14:59 -0800372 kref_get(&rv->ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
NeilBrownbaab9352006-03-27 01:15:09 -0800374 cache_put(&ipm->h, &ip_map_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 return rv;
376}
377
378void svcauth_unix_purge(void)
379{
380 cache_purge(&ip_map_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Greg Banks7b2b1fe2006-10-04 02:15:50 -0700383static inline struct ip_map *
384ip_map_cached_get(struct svc_rqst *rqstp)
385{
386 struct ip_map *ipm = rqstp->rq_sock->sk_info_authunix;
387 if (ipm != NULL) {
388 if (!cache_valid(&ipm->h)) {
389 /*
390 * The entry has been invalidated since it was
391 * remembered, e.g. by a second mount from the
392 * same IP address.
393 */
394 rqstp->rq_sock->sk_info_authunix = NULL;
395 cache_put(&ipm->h, &ip_map_cache);
396 return NULL;
397 }
398 cache_get(&ipm->h);
399 }
400 return ipm;
401}
402
403static inline void
404ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
405{
406 struct svc_sock *svsk = rqstp->rq_sock;
407
408 if (svsk->sk_sock->type == SOCK_STREAM && svsk->sk_info_authunix == NULL)
409 svsk->sk_info_authunix = ipm; /* newly cached, keep the reference */
410 else
411 cache_put(&ipm->h, &ip_map_cache);
412}
413
414void
415svcauth_unix_info_release(void *info)
416{
417 struct ip_map *ipm = info;
418 cache_put(&ipm->h, &ip_map_cache);
419}
420
NeilBrown3fc605a2007-02-14 00:33:13 -0800421/****************************************************************************
422 * auth.unix.gid cache
423 * simple cache to map a UID to a list of GIDs
424 * because AUTH_UNIX aka AUTH_SYS has a max of 16
425 */
426#define GID_HASHBITS 8
427#define GID_HASHMAX (1<<GID_HASHBITS)
428#define GID_HASHMASK (GID_HASHMAX - 1)
429
430struct unix_gid {
431 struct cache_head h;
432 uid_t uid;
433 struct group_info *gi;
434};
435static struct cache_head *gid_table[GID_HASHMAX];
436
437static void unix_gid_put(struct kref *kref)
438{
439 struct cache_head *item = container_of(kref, struct cache_head, ref);
440 struct unix_gid *ug = container_of(item, struct unix_gid, h);
441 if (test_bit(CACHE_VALID, &item->flags) &&
442 !test_bit(CACHE_NEGATIVE, &item->flags))
443 put_group_info(ug->gi);
444 kfree(ug);
445}
446
447static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
448{
449 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
450 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
451 return orig->uid == new->uid;
452}
453static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
454{
455 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
456 struct unix_gid *item = container_of(citem, struct unix_gid, h);
457 new->uid = item->uid;
458}
459static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
460{
461 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
462 struct unix_gid *item = container_of(citem, struct unix_gid, h);
463
464 get_group_info(item->gi);
465 new->gi = item->gi;
466}
467static struct cache_head *unix_gid_alloc(void)
468{
469 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
470 if (g)
471 return &g->h;
472 else
473 return NULL;
474}
475
476static void unix_gid_request(struct cache_detail *cd,
477 struct cache_head *h,
478 char **bpp, int *blen)
479{
480 char tuid[20];
481 struct unix_gid *ug = container_of(h, struct unix_gid, h);
482
483 snprintf(tuid, 20, "%u", ug->uid);
484 qword_add(bpp, blen, tuid);
485 (*bpp)[-1] = '\n';
486}
487
488static struct unix_gid *unix_gid_lookup(uid_t uid);
489extern struct cache_detail unix_gid_cache;
490
491static int unix_gid_parse(struct cache_detail *cd,
492 char *mesg, int mlen)
493{
494 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
495 int uid;
496 int gids;
497 int rv;
498 int i;
499 int err;
500 time_t expiry;
501 struct unix_gid ug, *ugp;
502
503 if (mlen <= 0 || mesg[mlen-1] != '\n')
504 return -EINVAL;
505 mesg[mlen-1] = 0;
506
507 rv = get_int(&mesg, &uid);
508 if (rv)
509 return -EINVAL;
510 ug.uid = uid;
511
512 expiry = get_expiry(&mesg);
513 if (expiry == 0)
514 return -EINVAL;
515
516 rv = get_int(&mesg, &gids);
517 if (rv || gids < 0 || gids > 8192)
518 return -EINVAL;
519
520 ug.gi = groups_alloc(gids);
521 if (!ug.gi)
522 return -ENOMEM;
523
524 for (i = 0 ; i < gids ; i++) {
525 int gid;
526 rv = get_int(&mesg, &gid);
527 err = -EINVAL;
528 if (rv)
529 goto out;
530 GROUP_AT(ug.gi, i) = gid;
531 }
532
533 ugp = unix_gid_lookup(uid);
534 if (ugp) {
535 struct cache_head *ch;
536 ug.h.flags = 0;
537 ug.h.expiry_time = expiry;
538 ch = sunrpc_cache_update(&unix_gid_cache,
539 &ug.h, &ugp->h,
540 hash_long(uid, GID_HASHBITS));
541 if (!ch)
542 err = -ENOMEM;
543 else {
544 err = 0;
545 cache_put(ch, &unix_gid_cache);
546 }
547 } else
548 err = -ENOMEM;
549 out:
550 if (ug.gi)
551 put_group_info(ug.gi);
552 return err;
553}
554
555static int unix_gid_show(struct seq_file *m,
556 struct cache_detail *cd,
557 struct cache_head *h)
558{
559 struct unix_gid *ug;
560 int i;
561 int glen;
562
563 if (h == NULL) {
564 seq_puts(m, "#uid cnt: gids...\n");
565 return 0;
566 }
567 ug = container_of(h, struct unix_gid, h);
568 if (test_bit(CACHE_VALID, &h->flags) &&
569 !test_bit(CACHE_NEGATIVE, &h->flags))
570 glen = ug->gi->ngroups;
571 else
572 glen = 0;
573
574 seq_printf(m, "%d %d:", ug->uid, glen);
575 for (i = 0; i < glen; i++)
576 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
577 seq_printf(m, "\n");
578 return 0;
579}
580
581struct cache_detail unix_gid_cache = {
582 .owner = THIS_MODULE,
583 .hash_size = GID_HASHMAX,
584 .hash_table = gid_table,
585 .name = "auth.unix.gid",
586 .cache_put = unix_gid_put,
587 .cache_request = unix_gid_request,
588 .cache_parse = unix_gid_parse,
589 .cache_show = unix_gid_show,
590 .match = unix_gid_match,
591 .init = unix_gid_init,
592 .update = unix_gid_update,
593 .alloc = unix_gid_alloc,
594};
595
596static struct unix_gid *unix_gid_lookup(uid_t uid)
597{
598 struct unix_gid ug;
599 struct cache_head *ch;
600
601 ug.uid = uid;
602 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
603 hash_long(uid, GID_HASHBITS));
604 if (ch)
605 return container_of(ch, struct unix_gid, h);
606 else
607 return NULL;
608}
609
610static int unix_gid_find(uid_t uid, struct group_info **gip,
611 struct svc_rqst *rqstp)
612{
613 struct unix_gid *ug = unix_gid_lookup(uid);
614 if (!ug)
615 return -EAGAIN;
616 switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
617 case -ENOENT:
618 *gip = NULL;
619 return 0;
620 case 0:
621 *gip = ug->gi;
622 get_group_info(*gip);
623 return 0;
624 default:
625 return -EAGAIN;
626 }
627}
628
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629static int
630svcauth_unix_set_client(struct svc_rqst *rqstp)
631{
Chuck Lever27459f02007-02-12 00:53:34 -0800632 struct sockaddr_in *sin = svc_addr_in(rqstp);
NeilBrown1a9917c2006-03-27 01:15:02 -0800633 struct ip_map *ipm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635 rqstp->rq_client = NULL;
636 if (rqstp->rq_proc == 0)
637 return SVC_OK;
638
Greg Banks7b2b1fe2006-10-04 02:15:50 -0700639 ipm = ip_map_cached_get(rqstp);
640 if (ipm == NULL)
641 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
Chuck Lever27459f02007-02-12 00:53:34 -0800642 sin->sin_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
644 if (ipm == NULL)
645 return SVC_DENIED;
646
647 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
648 default:
649 BUG();
650 case -EAGAIN:
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800651 case -ETIMEDOUT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 return SVC_DROP;
653 case -ENOENT:
654 return SVC_DENIED;
655 case 0:
656 rqstp->rq_client = &ipm->m_client->h;
NeilBrownefc36aa2006-03-27 01:14:59 -0800657 kref_get(&rqstp->rq_client->ref);
Greg Banks7b2b1fe2006-10-04 02:15:50 -0700658 ip_map_cached_put(rqstp, ipm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 break;
660 }
661 return SVC_OK;
662}
663
664static int
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700665svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666{
667 struct kvec *argv = &rqstp->rq_arg.head[0];
668 struct kvec *resv = &rqstp->rq_res.head[0];
669 struct svc_cred *cred = &rqstp->rq_cred;
670
671 cred->cr_group_info = NULL;
672 rqstp->rq_client = NULL;
673
674 if (argv->iov_len < 3*4)
675 return SVC_GARBAGE;
676
YOSHIFUJI Hideakicca51722007-02-09 15:38:13 -0800677 if (svc_getu32(argv) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 dprintk("svc: bad null cred\n");
679 *authp = rpc_autherr_badcred;
680 return SVC_DENIED;
681 }
Alexey Dobriyan76994312006-09-26 22:28:46 -0700682 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 dprintk("svc: bad null verf\n");
684 *authp = rpc_autherr_badverf;
685 return SVC_DENIED;
686 }
687
688 /* Signal that mapping to nobody uid/gid is required */
689 cred->cr_uid = (uid_t) -1;
690 cred->cr_gid = (gid_t) -1;
691 cred->cr_group_info = groups_alloc(0);
692 if (cred->cr_group_info == NULL)
693 return SVC_DROP; /* kmalloc failure - client must retry */
694
695 /* Put NULL verifier */
Alexey Dobriyan76994312006-09-26 22:28:46 -0700696 svc_putnl(resv, RPC_AUTH_NULL);
697 svc_putnl(resv, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 return SVC_OK;
700}
701
702static int
703svcauth_null_release(struct svc_rqst *rqstp)
704{
705 if (rqstp->rq_client)
706 auth_domain_put(rqstp->rq_client);
707 rqstp->rq_client = NULL;
708 if (rqstp->rq_cred.cr_group_info)
709 put_group_info(rqstp->rq_cred.cr_group_info);
710 rqstp->rq_cred.cr_group_info = NULL;
711
712 return 0; /* don't drop */
713}
714
715
716struct auth_ops svcauth_null = {
717 .name = "null",
718 .owner = THIS_MODULE,
719 .flavour = RPC_AUTH_NULL,
720 .accept = svcauth_null_accept,
721 .release = svcauth_null_release,
722 .set_client = svcauth_unix_set_client,
723};
724
725
726static int
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700727svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
729 struct kvec *argv = &rqstp->rq_arg.head[0];
730 struct kvec *resv = &rqstp->rq_res.head[0];
731 struct svc_cred *cred = &rqstp->rq_cred;
732 u32 slen, i;
733 int len = argv->iov_len;
734
735 cred->cr_group_info = NULL;
736 rqstp->rq_client = NULL;
737
738 if ((len -= 3*4) < 0)
739 return SVC_GARBAGE;
740
741 svc_getu32(argv); /* length */
742 svc_getu32(argv); /* time stamp */
Alexey Dobriyan76994312006-09-26 22:28:46 -0700743 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 if (slen > 64 || (len -= (slen + 3)*4) < 0)
745 goto badcred;
Alexey Dobriyand8ed0292006-09-26 22:29:38 -0700746 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 argv->iov_len -= slen*4;
748
Alexey Dobriyan76994312006-09-26 22:28:46 -0700749 cred->cr_uid = svc_getnl(argv); /* uid */
750 cred->cr_gid = svc_getnl(argv); /* gid */
751 slen = svc_getnl(argv); /* gids length */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if (slen > 16 || (len -= (slen + 2)*4) < 0)
753 goto badcred;
NeilBrown3fc605a2007-02-14 00:33:13 -0800754 if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
755 == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 return SVC_DROP;
NeilBrown3fc605a2007-02-14 00:33:13 -0800757 if (cred->cr_group_info == NULL) {
758 cred->cr_group_info = groups_alloc(slen);
759 if (cred->cr_group_info == NULL)
760 return SVC_DROP;
761 for (i = 0; i < slen; i++)
762 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
763 } else {
764 for (i = 0; i < slen ; i++)
765 svc_getnl(argv);
766 }
Alexey Dobriyan76994312006-09-26 22:28:46 -0700767 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 *authp = rpc_autherr_badverf;
769 return SVC_DENIED;
770 }
771
772 /* Put NULL verifier */
Alexey Dobriyan76994312006-09-26 22:28:46 -0700773 svc_putnl(resv, RPC_AUTH_NULL);
774 svc_putnl(resv, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 return SVC_OK;
777
778badcred:
779 *authp = rpc_autherr_badcred;
780 return SVC_DENIED;
781}
782
783static int
784svcauth_unix_release(struct svc_rqst *rqstp)
785{
786 /* Verifier (such as it is) is already in place.
787 */
788 if (rqstp->rq_client)
789 auth_domain_put(rqstp->rq_client);
790 rqstp->rq_client = NULL;
791 if (rqstp->rq_cred.cr_group_info)
792 put_group_info(rqstp->rq_cred.cr_group_info);
793 rqstp->rq_cred.cr_group_info = NULL;
794
795 return 0;
796}
797
798
799struct auth_ops svcauth_unix = {
800 .name = "unix",
801 .owner = THIS_MODULE,
802 .flavour = RPC_AUTH_UNIX,
803 .accept = svcauth_unix_accept,
804 .release = svcauth_unix_release,
805 .domain_release = svcauth_unix_domain_release,
806 .set_client = svcauth_unix_set_client,
807};
808