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/sunrpc/gss_api.h>
10 #include <linux/seq_file.h>
11 #include <linux/hash.h>
12 #include <linux/string.h>
15 #define RPCDBG_FACILITY RPCDBG_AUTH
19 * AUTHUNIX and AUTHNULL credentials are both handled here.
20 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
21 * are always nobody (-2). i.e. we do the same IP address checks for
22 * AUTHNULL as for AUTHUNIX, and that is done here.
29 /* other stuff later */
32 extern struct auth_ops svcauth_unix;
34 struct auth_domain *unix_domain_find(char *name)
36 struct auth_domain *rv;
37 struct unix_domain *new = NULL;
39 rv = auth_domain_lookup(name, NULL);
42 if (new && rv != &new->h)
43 auth_domain_put(&new->h);
45 if (rv->flavour != &svcauth_unix) {
52 new = kmalloc(sizeof(*new), GFP_KERNEL);
55 kref_init(&new->h.ref);
56 new->h.name = kstrdup(name, GFP_KERNEL);
57 if (new->h.name == NULL) {
61 new->h.flavour = &svcauth_unix;
62 new->addr_changes = 0;
63 rv = auth_domain_lookup(name, &new->h);
67 static void svcauth_unix_domain_release(struct auth_domain *dom)
69 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
76 /**************************************************
77 * cache for IP address to unix_domain
78 * as needed by AUTH_UNIX
81 #define IP_HASHMAX (1<<IP_HASHBITS)
82 #define IP_HASHMASK (IP_HASHMAX-1)
86 char m_class[8]; /* e.g. "nfsd" */
87 struct in_addr m_addr;
88 struct unix_domain *m_client;
91 static struct cache_head *ip_table[IP_HASHMAX];
93 static void ip_map_put(struct kref *kref)
95 struct cache_head *item = container_of(kref, struct cache_head, ref);
96 struct ip_map *im = container_of(item, struct ip_map,h);
98 if (test_bit(CACHE_VALID, &item->flags) &&
99 !test_bit(CACHE_NEGATIVE, &item->flags))
100 auth_domain_put(&im->m_client->h);
105 /* hash_long on a 64 bit machine is currently REALLY BAD for
106 * IP addresses in reverse-endian (i.e. on a little-endian machine).
107 * So use a trivial but reliable hash instead
109 static inline int hash_ip(__be32 ip)
111 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
112 return (hash ^ (hash>>8)) & 0xff;
115 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
117 struct ip_map *orig = container_of(corig, struct ip_map, h);
118 struct ip_map *new = container_of(cnew, struct ip_map, h);
119 return strcmp(orig->m_class, new->m_class) == 0
120 && orig->m_addr.s_addr == new->m_addr.s_addr;
122 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
124 struct ip_map *new = container_of(cnew, struct ip_map, h);
125 struct ip_map *item = container_of(citem, struct ip_map, h);
127 strcpy(new->m_class, item->m_class);
128 new->m_addr.s_addr = item->m_addr.s_addr;
130 static void update(struct cache_head *cnew, struct cache_head *citem)
132 struct ip_map *new = container_of(cnew, struct ip_map, h);
133 struct ip_map *item = container_of(citem, struct ip_map, h);
135 kref_get(&item->m_client->h.ref);
136 new->m_client = item->m_client;
137 new->m_add_change = item->m_add_change;
139 static struct cache_head *ip_map_alloc(void)
141 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
148 static void ip_map_request(struct cache_detail *cd,
149 struct cache_head *h,
150 char **bpp, int *blen)
153 struct ip_map *im = container_of(h, struct ip_map, h);
154 __be32 addr = im->m_addr.s_addr;
156 snprintf(text_addr, 20, "%u.%u.%u.%u",
157 ntohl(addr) >> 24 & 0xff,
158 ntohl(addr) >> 16 & 0xff,
159 ntohl(addr) >> 8 & 0xff,
160 ntohl(addr) >> 0 & 0xff);
162 qword_add(bpp, blen, im->m_class);
163 qword_add(bpp, blen, text_addr);
167 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
168 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
170 static int ip_map_parse(struct cache_detail *cd,
171 char *mesg, int mlen)
173 /* class ipaddress [domainname] */
174 /* should be safe just to use the start of the input buffer
185 struct auth_domain *dom;
188 if (mesg[mlen-1] != '\n')
193 len = qword_get(&mesg, class, sizeof(class));
194 if (len <= 0) return -EINVAL;
197 len = qword_get(&mesg, buf, mlen);
198 if (len <= 0) return -EINVAL;
200 if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
203 expiry = get_expiry(&mesg);
207 /* domainname, or empty for NEGATIVE */
208 len = qword_get(&mesg, buf, mlen);
209 if (len < 0) return -EINVAL;
212 dom = unix_domain_find(buf);
219 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
221 ipmp = ip_map_lookup(class,addr);
223 err = ip_map_update(ipmp,
224 container_of(dom, struct unix_domain, h),
230 auth_domain_put(dom);
236 static int ip_map_show(struct seq_file *m,
237 struct cache_detail *cd,
238 struct cache_head *h)
242 char *dom = "-no-domain-";
245 seq_puts(m, "#class IP domain\n");
248 im = container_of(h, struct ip_map, h);
249 /* class addr domain */
252 if (test_bit(CACHE_VALID, &h->flags) &&
253 !test_bit(CACHE_NEGATIVE, &h->flags))
254 dom = im->m_client->h.name;
256 seq_printf(m, "%s %d.%d.%d.%d %s\n",
258 ntohl(addr.s_addr) >> 24 & 0xff,
259 ntohl(addr.s_addr) >> 16 & 0xff,
260 ntohl(addr.s_addr) >> 8 & 0xff,
261 ntohl(addr.s_addr) >> 0 & 0xff,
268 struct cache_detail ip_map_cache = {
269 .owner = THIS_MODULE,
270 .hash_size = IP_HASHMAX,
271 .hash_table = ip_table,
272 .name = "auth.unix.ip",
273 .cache_put = ip_map_put,
274 .cache_request = ip_map_request,
275 .cache_parse = ip_map_parse,
276 .cache_show = ip_map_show,
277 .match = ip_map_match,
280 .alloc = ip_map_alloc,
283 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
286 struct cache_head *ch;
288 strcpy(ip.m_class, class);
290 ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
291 hash_str(class, IP_HASHBITS) ^
292 hash_ip(addr.s_addr));
295 return container_of(ch, struct ip_map, h);
300 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
303 struct cache_head *ch;
308 set_bit(CACHE_NEGATIVE, &ip.h.flags);
310 ip.m_add_change = udom->addr_changes;
311 /* if this is from the legacy set_client system call,
312 * we need m_add_change to be one higher
317 ip.h.expiry_time = expiry;
318 ch = sunrpc_cache_update(&ip_map_cache,
320 hash_str(ipm->m_class, IP_HASHBITS) ^
321 hash_ip(ipm->m_addr.s_addr));
324 cache_put(ch, &ip_map_cache);
328 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
330 struct unix_domain *udom;
333 if (dom->flavour != &svcauth_unix)
335 udom = container_of(dom, struct unix_domain, h);
336 ipmp = ip_map_lookup("nfsd", addr);
339 return ip_map_update(ipmp, udom, NEVER);
344 int auth_unix_forget_old(struct auth_domain *dom)
346 struct unix_domain *udom;
348 if (dom->flavour != &svcauth_unix)
350 udom = container_of(dom, struct unix_domain, h);
351 udom->addr_changes++;
355 struct auth_domain *auth_unix_lookup(struct in_addr addr)
358 struct auth_domain *rv;
360 ipm = ip_map_lookup("nfsd", addr);
364 if (cache_check(&ip_map_cache, &ipm->h, NULL))
367 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
368 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
369 auth_domain_put(&ipm->m_client->h);
372 rv = &ipm->m_client->h;
375 cache_put(&ipm->h, &ip_map_cache);
379 void svcauth_unix_purge(void)
381 cache_purge(&ip_map_cache);
384 static inline struct ip_map *
385 ip_map_cached_get(struct svc_rqst *rqstp)
387 struct ip_map *ipm = NULL;
388 struct svc_xprt *xprt = rqstp->rq_xprt;
390 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
391 spin_lock(&xprt->xpt_lock);
392 ipm = xprt->xpt_auth_cache;
394 if (!cache_valid(&ipm->h)) {
396 * The entry has been invalidated since it was
397 * remembered, e.g. by a second mount from the
400 xprt->xpt_auth_cache = NULL;
401 spin_unlock(&xprt->xpt_lock);
402 cache_put(&ipm->h, &ip_map_cache);
407 spin_unlock(&xprt->xpt_lock);
413 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
415 struct svc_xprt *xprt = rqstp->rq_xprt;
417 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
418 spin_lock(&xprt->xpt_lock);
419 if (xprt->xpt_auth_cache == NULL) {
420 /* newly cached, keep the reference */
421 xprt->xpt_auth_cache = ipm;
424 spin_unlock(&xprt->xpt_lock);
427 cache_put(&ipm->h, &ip_map_cache);
431 svcauth_unix_info_release(void *info)
433 struct ip_map *ipm = info;
434 cache_put(&ipm->h, &ip_map_cache);
437 /****************************************************************************
438 * auth.unix.gid cache
439 * simple cache to map a UID to a list of GIDs
440 * because AUTH_UNIX aka AUTH_SYS has a max of 16
442 #define GID_HASHBITS 8
443 #define GID_HASHMAX (1<<GID_HASHBITS)
444 #define GID_HASHMASK (GID_HASHMAX - 1)
449 struct group_info *gi;
451 static struct cache_head *gid_table[GID_HASHMAX];
453 static void unix_gid_put(struct kref *kref)
455 struct cache_head *item = container_of(kref, struct cache_head, ref);
456 struct unix_gid *ug = container_of(item, struct unix_gid, h);
457 if (test_bit(CACHE_VALID, &item->flags) &&
458 !test_bit(CACHE_NEGATIVE, &item->flags))
459 put_group_info(ug->gi);
463 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
465 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
466 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
467 return orig->uid == new->uid;
469 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
471 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
472 struct unix_gid *item = container_of(citem, struct unix_gid, h);
473 new->uid = item->uid;
475 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
477 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
478 struct unix_gid *item = container_of(citem, struct unix_gid, h);
480 get_group_info(item->gi);
483 static struct cache_head *unix_gid_alloc(void)
485 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
492 static void unix_gid_request(struct cache_detail *cd,
493 struct cache_head *h,
494 char **bpp, int *blen)
497 struct unix_gid *ug = container_of(h, struct unix_gid, h);
499 snprintf(tuid, 20, "%u", ug->uid);
500 qword_add(bpp, blen, tuid);
504 static struct unix_gid *unix_gid_lookup(uid_t uid);
505 extern struct cache_detail unix_gid_cache;
507 static int unix_gid_parse(struct cache_detail *cd,
508 char *mesg, int mlen)
510 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
517 struct unix_gid ug, *ugp;
519 if (mlen <= 0 || mesg[mlen-1] != '\n')
523 rv = get_int(&mesg, &uid);
528 expiry = get_expiry(&mesg);
532 rv = get_int(&mesg, &gids);
533 if (rv || gids < 0 || gids > 8192)
536 ug.gi = groups_alloc(gids);
540 for (i = 0 ; i < gids ; i++) {
542 rv = get_int(&mesg, &gid);
546 GROUP_AT(ug.gi, i) = gid;
549 ugp = unix_gid_lookup(uid);
551 struct cache_head *ch;
553 ug.h.expiry_time = expiry;
554 ch = sunrpc_cache_update(&unix_gid_cache,
556 hash_long(uid, GID_HASHBITS));
561 cache_put(ch, &unix_gid_cache);
567 put_group_info(ug.gi);
571 static int unix_gid_show(struct seq_file *m,
572 struct cache_detail *cd,
573 struct cache_head *h)
580 seq_puts(m, "#uid cnt: gids...\n");
583 ug = container_of(h, struct unix_gid, h);
584 if (test_bit(CACHE_VALID, &h->flags) &&
585 !test_bit(CACHE_NEGATIVE, &h->flags))
586 glen = ug->gi->ngroups;
590 seq_printf(m, "%d %d:", ug->uid, glen);
591 for (i = 0; i < glen; i++)
592 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
597 struct cache_detail unix_gid_cache = {
598 .owner = THIS_MODULE,
599 .hash_size = GID_HASHMAX,
600 .hash_table = gid_table,
601 .name = "auth.unix.gid",
602 .cache_put = unix_gid_put,
603 .cache_request = unix_gid_request,
604 .cache_parse = unix_gid_parse,
605 .cache_show = unix_gid_show,
606 .match = unix_gid_match,
607 .init = unix_gid_init,
608 .update = unix_gid_update,
609 .alloc = unix_gid_alloc,
612 static struct unix_gid *unix_gid_lookup(uid_t uid)
615 struct cache_head *ch;
618 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
619 hash_long(uid, GID_HASHBITS));
621 return container_of(ch, struct unix_gid, h);
626 static int unix_gid_find(uid_t uid, struct group_info **gip,
627 struct svc_rqst *rqstp)
629 struct unix_gid *ug = unix_gid_lookup(uid);
632 switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
638 get_group_info(*gip);
646 svcauth_unix_set_client(struct svc_rqst *rqstp)
648 struct sockaddr_in *sin = svc_addr_in(rqstp);
651 rqstp->rq_client = NULL;
652 if (rqstp->rq_proc == 0)
655 ipm = ip_map_cached_get(rqstp);
657 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
663 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
672 rqstp->rq_client = &ipm->m_client->h;
673 kref_get(&rqstp->rq_client->ref);
674 ip_map_cached_put(rqstp, ipm);
680 EXPORT_SYMBOL(svcauth_unix_set_client);
683 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
685 struct kvec *argv = &rqstp->rq_arg.head[0];
686 struct kvec *resv = &rqstp->rq_res.head[0];
687 struct svc_cred *cred = &rqstp->rq_cred;
689 cred->cr_group_info = NULL;
690 rqstp->rq_client = NULL;
692 if (argv->iov_len < 3*4)
695 if (svc_getu32(argv) != 0) {
696 dprintk("svc: bad null cred\n");
697 *authp = rpc_autherr_badcred;
700 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
701 dprintk("svc: bad null verf\n");
702 *authp = rpc_autherr_badverf;
706 /* Signal that mapping to nobody uid/gid is required */
707 cred->cr_uid = (uid_t) -1;
708 cred->cr_gid = (gid_t) -1;
709 cred->cr_group_info = groups_alloc(0);
710 if (cred->cr_group_info == NULL)
711 return SVC_DROP; /* kmalloc failure - client must retry */
713 /* Put NULL verifier */
714 svc_putnl(resv, RPC_AUTH_NULL);
717 rqstp->rq_flavor = RPC_AUTH_NULL;
722 svcauth_null_release(struct svc_rqst *rqstp)
724 if (rqstp->rq_client)
725 auth_domain_put(rqstp->rq_client);
726 rqstp->rq_client = NULL;
727 if (rqstp->rq_cred.cr_group_info)
728 put_group_info(rqstp->rq_cred.cr_group_info);
729 rqstp->rq_cred.cr_group_info = NULL;
731 return 0; /* don't drop */
735 struct auth_ops svcauth_null = {
737 .owner = THIS_MODULE,
738 .flavour = RPC_AUTH_NULL,
739 .accept = svcauth_null_accept,
740 .release = svcauth_null_release,
741 .set_client = svcauth_unix_set_client,
746 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
748 struct kvec *argv = &rqstp->rq_arg.head[0];
749 struct kvec *resv = &rqstp->rq_res.head[0];
750 struct svc_cred *cred = &rqstp->rq_cred;
752 int len = argv->iov_len;
754 cred->cr_group_info = NULL;
755 rqstp->rq_client = NULL;
757 if ((len -= 3*4) < 0)
760 svc_getu32(argv); /* length */
761 svc_getu32(argv); /* time stamp */
762 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
763 if (slen > 64 || (len -= (slen + 3)*4) < 0)
765 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
766 argv->iov_len -= slen*4;
768 cred->cr_uid = svc_getnl(argv); /* uid */
769 cred->cr_gid = svc_getnl(argv); /* gid */
770 slen = svc_getnl(argv); /* gids length */
771 if (slen > 16 || (len -= (slen + 2)*4) < 0)
773 if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
776 if (cred->cr_group_info == NULL) {
777 cred->cr_group_info = groups_alloc(slen);
778 if (cred->cr_group_info == NULL)
780 for (i = 0; i < slen; i++)
781 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
783 for (i = 0; i < slen ; i++)
786 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
787 *authp = rpc_autherr_badverf;
791 /* Put NULL verifier */
792 svc_putnl(resv, RPC_AUTH_NULL);
795 rqstp->rq_flavor = RPC_AUTH_UNIX;
799 *authp = rpc_autherr_badcred;
804 svcauth_unix_release(struct svc_rqst *rqstp)
806 /* Verifier (such as it is) is already in place.
808 if (rqstp->rq_client)
809 auth_domain_put(rqstp->rq_client);
810 rqstp->rq_client = NULL;
811 if (rqstp->rq_cred.cr_group_info)
812 put_group_info(rqstp->rq_cred.cr_group_info);
813 rqstp->rq_cred.cr_group_info = NULL;
819 struct auth_ops svcauth_unix = {
821 .owner = THIS_MODULE,
822 .flavour = RPC_AUTH_UNIX,
823 .accept = svcauth_unix_accept,
824 .release = svcauth_unix_release,
825 .domain_release = svcauth_unix_domain_release,
826 .set_client = svcauth_unix_set_client,