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>
9 #include <linux/seq_file.h>
10 #include <linux/hash.h>
11 #include <linux/string.h>
14 #define RPCDBG_FACILITY RPCDBG_AUTH
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.
28 /* other stuff later */
31 extern struct auth_ops svcauth_unix;
33 struct auth_domain *unix_domain_find(char *name)
35 struct auth_domain *rv;
36 struct unix_domain *new = NULL;
38 rv = auth_domain_lookup(name, NULL);
41 if (new && rv != &new->h)
42 auth_domain_put(&new->h);
44 if (rv->flavour != &svcauth_unix) {
51 new = kmalloc(sizeof(*new), GFP_KERNEL);
54 kref_init(&new->h.ref);
55 new->h.name = kstrdup(name, GFP_KERNEL);
56 if (new->h.name == NULL) {
60 new->h.flavour = &svcauth_unix;
61 new->addr_changes = 0;
62 rv = auth_domain_lookup(name, &new->h);
66 static void svcauth_unix_domain_release(struct auth_domain *dom)
68 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
75 /**************************************************
76 * cache for IP address to unix_domain
77 * as needed by AUTH_UNIX
80 #define IP_HASHMAX (1<<IP_HASHBITS)
81 #define IP_HASHMASK (IP_HASHMAX-1)
85 char m_class[8]; /* e.g. "nfsd" */
86 struct in_addr m_addr;
87 struct unix_domain *m_client;
90 static struct cache_head *ip_table[IP_HASHMAX];
92 static void ip_map_put(struct kref *kref)
94 struct cache_head *item = container_of(kref, struct cache_head, ref);
95 struct ip_map *im = container_of(item, struct ip_map,h);
97 if (test_bit(CACHE_VALID, &item->flags) &&
98 !test_bit(CACHE_NEGATIVE, &item->flags))
99 auth_domain_put(&im->m_client->h);
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
108 static inline int hash_ip(__be32 ip)
110 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
111 return (hash ^ (hash>>8)) & 0xff;
114 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
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;
121 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
123 struct ip_map *new = container_of(cnew, struct ip_map, h);
124 struct ip_map *item = container_of(citem, struct ip_map, h);
126 strcpy(new->m_class, item->m_class);
127 new->m_addr.s_addr = item->m_addr.s_addr;
129 static void update(struct cache_head *cnew, struct cache_head *citem)
131 struct ip_map *new = container_of(cnew, struct ip_map, h);
132 struct ip_map *item = container_of(citem, struct ip_map, h);
134 kref_get(&item->m_client->h.ref);
135 new->m_client = item->m_client;
136 new->m_add_change = item->m_add_change;
138 static struct cache_head *ip_map_alloc(void)
140 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
147 static void ip_map_request(struct cache_detail *cd,
148 struct cache_head *h,
149 char **bpp, int *blen)
152 struct ip_map *im = container_of(h, struct ip_map, h);
153 __be32 addr = im->m_addr.s_addr;
155 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);
161 qword_add(bpp, blen, im->m_class);
162 qword_add(bpp, blen, text_addr);
166 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
167 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
169 static int ip_map_parse(struct cache_detail *cd,
170 char *mesg, int mlen)
172 /* class ipaddress [domainname] */
173 /* should be safe just to use the start of the input buffer
184 struct auth_domain *dom;
187 if (mesg[mlen-1] != '\n')
192 len = qword_get(&mesg, class, sizeof(class));
193 if (len <= 0) return -EINVAL;
196 len = qword_get(&mesg, buf, mlen);
197 if (len <= 0) return -EINVAL;
199 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
202 expiry = get_expiry(&mesg);
206 /* domainname, or empty for NEGATIVE */
207 len = qword_get(&mesg, buf, mlen);
208 if (len < 0) return -EINVAL;
211 dom = unix_domain_find(buf);
218 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
220 ipmp = ip_map_lookup(class,addr);
222 err = ip_map_update(ipmp,
223 container_of(dom, struct unix_domain, h),
229 auth_domain_put(dom);
235 static int ip_map_show(struct seq_file *m,
236 struct cache_detail *cd,
237 struct cache_head *h)
241 char *dom = "-no-domain-";
244 seq_puts(m, "#class IP domain\n");
247 im = container_of(h, struct ip_map, h);
248 /* class addr domain */
251 if (test_bit(CACHE_VALID, &h->flags) &&
252 !test_bit(CACHE_NEGATIVE, &h->flags))
253 dom = im->m_client->h.name;
255 seq_printf(m, "%s %d.%d.%d.%d %s\n",
257 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,
267 struct cache_detail ip_map_cache = {
268 .owner = THIS_MODULE,
269 .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,
276 .match = ip_map_match,
279 .alloc = ip_map_alloc,
282 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
285 struct cache_head *ch;
287 strcpy(ip.m_class, class);
289 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
290 hash_str(class, IP_HASHBITS) ^
291 hash_ip(addr.s_addr));
294 return container_of(ch, struct ip_map, h);
299 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
302 struct cache_head *ch;
307 set_bit(CACHE_NEGATIVE, &ip.h.flags);
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
316 ip.h.expiry_time = expiry;
317 ch = sunrpc_cache_update(&ip_map_cache,
319 hash_str(ipm->m_class, IP_HASHBITS) ^
320 hash_ip(ipm->m_addr.s_addr));
323 cache_put(ch, &ip_map_cache);
327 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
329 struct unix_domain *udom;
332 if (dom->flavour != &svcauth_unix)
334 udom = container_of(dom, struct unix_domain, h);
335 ipmp = ip_map_lookup("nfsd", addr);
338 return ip_map_update(ipmp, udom, NEVER);
343 int auth_unix_forget_old(struct auth_domain *dom)
345 struct unix_domain *udom;
347 if (dom->flavour != &svcauth_unix)
349 udom = container_of(dom, struct unix_domain, h);
350 udom->addr_changes++;
354 struct auth_domain *auth_unix_lookup(struct in_addr addr)
357 struct auth_domain *rv;
359 ipm = ip_map_lookup("nfsd", addr);
363 if (cache_check(&ip_map_cache, &ipm->h, NULL))
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);
371 rv = &ipm->m_client->h;
374 cache_put(&ipm->h, &ip_map_cache);
378 void svcauth_unix_purge(void)
380 cache_purge(&ip_map_cache);
383 static inline struct ip_map *
384 ip_map_cached_get(struct svc_rqst *rqstp)
386 struct ip_map *ipm = rqstp->rq_sock->sk_info_authunix;
388 if (!cache_valid(&ipm->h)) {
390 * The entry has been invalidated since it was
391 * remembered, e.g. by a second mount from the
394 rqstp->rq_sock->sk_info_authunix = NULL;
395 cache_put(&ipm->h, &ip_map_cache);
404 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
406 struct svc_sock *svsk = rqstp->rq_sock;
408 if (svsk->sk_sock->type == SOCK_STREAM && svsk->sk_info_authunix == NULL)
409 svsk->sk_info_authunix = ipm; /* newly cached, keep the reference */
411 cache_put(&ipm->h, &ip_map_cache);
415 svcauth_unix_info_release(void *info)
417 struct ip_map *ipm = info;
418 cache_put(&ipm->h, &ip_map_cache);
421 /****************************************************************************
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
426 #define GID_HASHBITS 8
427 #define GID_HASHMAX (1<<GID_HASHBITS)
428 #define GID_HASHMASK (GID_HASHMAX - 1)
433 struct group_info *gi;
435 static struct cache_head *gid_table[GID_HASHMAX];
437 static void unix_gid_put(struct kref *kref)
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);
447 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
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;
453 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
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;
459 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
461 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
462 struct unix_gid *item = container_of(citem, struct unix_gid, h);
464 get_group_info(item->gi);
467 static struct cache_head *unix_gid_alloc(void)
469 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
476 static void unix_gid_request(struct cache_detail *cd,
477 struct cache_head *h,
478 char **bpp, int *blen)
481 struct unix_gid *ug = container_of(h, struct unix_gid, h);
483 snprintf(tuid, 20, "%u", ug->uid);
484 qword_add(bpp, blen, tuid);
488 static struct unix_gid *unix_gid_lookup(uid_t uid);
489 extern struct cache_detail unix_gid_cache;
491 static int unix_gid_parse(struct cache_detail *cd,
492 char *mesg, int mlen)
494 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
501 struct unix_gid ug, *ugp;
503 if (mlen <= 0 || mesg[mlen-1] != '\n')
507 rv = get_int(&mesg, &uid);
512 expiry = get_expiry(&mesg);
516 rv = get_int(&mesg, &gids);
517 if (rv || gids < 0 || gids > 8192)
520 ug.gi = groups_alloc(gids);
524 for (i = 0 ; i < gids ; i++) {
526 rv = get_int(&mesg, &gid);
530 GROUP_AT(ug.gi, i) = gid;
533 ugp = unix_gid_lookup(uid);
535 struct cache_head *ch;
537 ug.h.expiry_time = expiry;
538 ch = sunrpc_cache_update(&unix_gid_cache,
540 hash_long(uid, GID_HASHBITS));
545 cache_put(ch, &unix_gid_cache);
551 put_group_info(ug.gi);
555 static int unix_gid_show(struct seq_file *m,
556 struct cache_detail *cd,
557 struct cache_head *h)
564 seq_puts(m, "#uid cnt: gids...\n");
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;
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));
581 struct 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,
596 static struct unix_gid *unix_gid_lookup(uid_t uid)
599 struct cache_head *ch;
602 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
603 hash_long(uid, GID_HASHBITS));
605 return container_of(ch, struct unix_gid, h);
610 static int unix_gid_find(uid_t uid, struct group_info **gip,
611 struct svc_rqst *rqstp)
613 struct unix_gid *ug = unix_gid_lookup(uid);
616 switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
622 get_group_info(*gip);
630 svcauth_unix_set_client(struct svc_rqst *rqstp)
632 struct sockaddr_in *sin = svc_addr_in(rqstp);
635 rqstp->rq_client = NULL;
636 if (rqstp->rq_proc == 0)
639 ipm = ip_map_cached_get(rqstp);
641 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
647 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
656 rqstp->rq_client = &ipm->m_client->h;
657 kref_get(&rqstp->rq_client->ref);
658 ip_map_cached_put(rqstp, ipm);
665 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
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;
671 cred->cr_group_info = NULL;
672 rqstp->rq_client = NULL;
674 if (argv->iov_len < 3*4)
677 if (svc_getu32(argv) != 0) {
678 dprintk("svc: bad null cred\n");
679 *authp = rpc_autherr_badcred;
682 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
683 dprintk("svc: bad null verf\n");
684 *authp = rpc_autherr_badverf;
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 */
695 /* Put NULL verifier */
696 svc_putnl(resv, RPC_AUTH_NULL);
703 svcauth_null_release(struct svc_rqst *rqstp)
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;
712 return 0; /* don't drop */
716 struct auth_ops svcauth_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,
727 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
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;
733 int len = argv->iov_len;
735 cred->cr_group_info = NULL;
736 rqstp->rq_client = NULL;
738 if ((len -= 3*4) < 0)
741 svc_getu32(argv); /* length */
742 svc_getu32(argv); /* time stamp */
743 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
744 if (slen > 64 || (len -= (slen + 3)*4) < 0)
746 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
747 argv->iov_len -= slen*4;
749 cred->cr_uid = svc_getnl(argv); /* uid */
750 cred->cr_gid = svc_getnl(argv); /* gid */
751 slen = svc_getnl(argv); /* gids length */
752 if (slen > 16 || (len -= (slen + 2)*4) < 0)
754 if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
757 if (cred->cr_group_info == NULL) {
758 cred->cr_group_info = groups_alloc(slen);
759 if (cred->cr_group_info == NULL)
761 for (i = 0; i < slen; i++)
762 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
764 for (i = 0; i < slen ; i++)
767 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
768 *authp = rpc_autherr_badverf;
772 /* Put NULL verifier */
773 svc_putnl(resv, RPC_AUTH_NULL);
779 *authp = rpc_autherr_badcred;
784 svcauth_unix_release(struct svc_rqst *rqstp)
786 /* Verifier (such as it is) is already in place.
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;
799 struct auth_ops svcauth_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,