/net/sunrpc/svcauth_unix.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2#include <linux/types.h>
  3#include <linux/sched.h>
  4#include <linux/module.h>
  5#include <linux/sunrpc/types.h>
  6#include <linux/sunrpc/xdr.h>
  7#include <linux/sunrpc/svcsock.h>
  8#include <linux/sunrpc/svcauth.h>
  9#include <linux/sunrpc/gss_api.h>
 10#include <linux/sunrpc/addr.h>
 11#include <linux/err.h>
 12#include <linux/seq_file.h>
 13#include <linux/hash.h>
 14#include <linux/string.h>
 15#include <linux/slab.h>
 16#include <net/sock.h>
 17#include <net/ipv6.h>
 18#include <linux/kernel.h>
 19#include <linux/user_namespace.h>
 20#define RPCDBG_FACILITY	RPCDBG_AUTH
 21
 22
 23#include "netns.h"
 24
 25/*
 26 * AUTHUNIX and AUTHNULL credentials are both handled here.
 27 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
 28 * are always nobody (-2).  i.e. we do the same IP address checks for
 29 * AUTHNULL as for AUTHUNIX, and that is done here.
 30 */
 31
 32
 33struct unix_domain {
 34	struct auth_domain	h;
 35	/* other stuff later */
 36};
 37
 38extern struct auth_ops svcauth_null;
 39extern struct auth_ops svcauth_unix;
 40
 41static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
 42{
 43	struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
 44	struct unix_domain *ud = container_of(dom, struct unix_domain, h);
 45
 46	kfree(dom->name);
 47	kfree(ud);
 48}
 49
 50static void svcauth_unix_domain_release(struct auth_domain *dom)
 51{
 52	call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
 53}
 54
 55struct auth_domain *unix_domain_find(char *name)
 56{
 57	struct auth_domain *rv;
 58	struct unix_domain *new = NULL;
 59
 60	rv = auth_domain_find(name);
 61	while(1) {
 62		if (rv) {
 63			if (new && rv != &new->h)
 64				svcauth_unix_domain_release(&new->h);
 65
 66			if (rv->flavour != &svcauth_unix) {
 67				auth_domain_put(rv);
 68				return NULL;
 69			}
 70			return rv;
 71		}
 72
 73		new = kmalloc(sizeof(*new), GFP_KERNEL);
 74		if (new == NULL)
 75			return NULL;
 76		kref_init(&new->h.ref);
 77		new->h.name = kstrdup(name, GFP_KERNEL);
 78		if (new->h.name == NULL) {
 79			kfree(new);
 80			return NULL;
 81		}
 82		new->h.flavour = &svcauth_unix;
 83		rv = auth_domain_lookup(name, &new->h);
 84	}
 85}
 86EXPORT_SYMBOL_GPL(unix_domain_find);
 87
 88
 89/**************************************************
 90 * cache for IP address to unix_domain
 91 * as needed by AUTH_UNIX
 92 */
 93#define	IP_HASHBITS	8
 94#define	IP_HASHMAX	(1<<IP_HASHBITS)
 95
 96struct ip_map {
 97	struct cache_head	h;
 98	char			m_class[8]; /* e.g. "nfsd" */
 99	struct in6_addr		m_addr;
100	struct unix_domain	*m_client;
101	struct rcu_head		m_rcu;
102};
103
104static void ip_map_put(struct kref *kref)
105{
106	struct cache_head *item = container_of(kref, struct cache_head, ref);
107	struct ip_map *im = container_of(item, struct ip_map,h);
108
109	if (test_bit(CACHE_VALID, &item->flags) &&
110	    !test_bit(CACHE_NEGATIVE, &item->flags))
111		auth_domain_put(&im->m_client->h);
112	kfree_rcu(im, m_rcu);
113}
114
115static inline int hash_ip6(const struct in6_addr *ip)
116{
117	return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
118}
119static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
120{
121	struct ip_map *orig = container_of(corig, struct ip_map, h);
122	struct ip_map *new = container_of(cnew, struct ip_map, h);
123	return strcmp(orig->m_class, new->m_class) == 0 &&
124	       ipv6_addr_equal(&orig->m_addr, &new->m_addr);
125}
126static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
127{
128	struct ip_map *new = container_of(cnew, struct ip_map, h);
129	struct ip_map *item = container_of(citem, struct ip_map, h);
130
131	strcpy(new->m_class, item->m_class);
132	new->m_addr = item->m_addr;
133}
134static void update(struct cache_head *cnew, struct cache_head *citem)
135{
136	struct ip_map *new = container_of(cnew, struct ip_map, h);
137	struct ip_map *item = container_of(citem, struct ip_map, h);
138
139	kref_get(&item->m_client->h.ref);
140	new->m_client = item->m_client;
141}
142static struct cache_head *ip_map_alloc(void)
143{
144	struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
145	if (i)
146		return &i->h;
147	else
148		return NULL;
149}
150
151static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
152{
153	return sunrpc_cache_pipe_upcall(cd, h);
154}
155
156static void ip_map_request(struct cache_detail *cd,
157				  struct cache_head *h,
158				  char **bpp, int *blen)
159{
160	char text_addr[40];
161	struct ip_map *im = container_of(h, struct ip_map, h);
162
163	if (ipv6_addr_v4mapped(&(im->m_addr))) {
164		snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
165	} else {
166		snprintf(text_addr, 40, "%pI6", &im->m_addr);
167	}
168	qword_add(bpp, blen, im->m_class);
169	qword_add(bpp, blen, text_addr);
170	(*bpp)[-1] = '\n';
171}
172
173static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
174static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
175
176static int ip_map_parse(struct cache_detail *cd,
177			  char *mesg, int mlen)
178{
179	/* class ipaddress [domainname] */
180	/* should be safe just to use the start of the input buffer
181	 * for scratch: */
182	char *buf = mesg;
183	int len;
184	char class[8];
185	union {
186		struct sockaddr		sa;
187		struct sockaddr_in	s4;
188		struct sockaddr_in6	s6;
189	} address;
190	struct sockaddr_in6 sin6;
191	int err;
192
193	struct ip_map *ipmp;
194	struct auth_domain *dom;
195	time64_t expiry;
196
197	if (mesg[mlen-1] != '\n')
198		return -EINVAL;
199	mesg[mlen-1] = 0;
200
201	/* class */
202	len = qword_get(&mesg, class, sizeof(class));
203	if (len <= 0) return -EINVAL;
204
205	/* ip address */
206	len = qword_get(&mesg, buf, mlen);
207	if (len <= 0) return -EINVAL;
208
209	if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
210		return -EINVAL;
211	switch (address.sa.sa_family) {
212	case AF_INET:
213		/* Form a mapped IPv4 address in sin6 */
214		sin6.sin6_family = AF_INET6;
215		ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
216				&sin6.sin6_addr);
217		break;
218#if IS_ENABLED(CONFIG_IPV6)
219	case AF_INET6:
220		memcpy(&sin6, &address.s6, sizeof(sin6));
221		break;
222#endif
223	default:
224		return -EINVAL;
225	}
226
227	expiry = get_expiry(&mesg);
228	if (expiry ==0)
229		return -EINVAL;
230
231	/* domainname, or empty for NEGATIVE */
232	len = qword_get(&mesg, buf, mlen);
233	if (len < 0) return -EINVAL;
234
235	if (len) {
236		dom = unix_domain_find(buf);
237		if (dom == NULL)
238			return -ENOENT;
239	} else
240		dom = NULL;
241
242	/* IPv6 scope IDs are ignored for now */
243	ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
244	if (ipmp) {
245		err = __ip_map_update(cd, ipmp,
246			     container_of(dom, struct unix_domain, h),
247			     expiry);
248	} else
249		err = -ENOMEM;
250
251	if (dom)
252		auth_domain_put(dom);
253
254	cache_flush();
255	return err;
256}
257
258static int ip_map_show(struct seq_file *m,
259		       struct cache_detail *cd,
260		       struct cache_head *h)
261{
262	struct ip_map *im;
263	struct in6_addr addr;
264	char *dom = "-no-domain-";
265
266	if (h == NULL) {
267		seq_puts(m, "#class IP domain\n");
268		return 0;
269	}
270	im = container_of(h, struct ip_map, h);
271	/* class addr domain */
272	addr = im->m_addr;
273
274	if (test_bit(CACHE_VALID, &h->flags) &&
275	    !test_bit(CACHE_NEGATIVE, &h->flags))
276		dom = im->m_client->h.name;
277
278	if (ipv6_addr_v4mapped(&addr)) {
279		seq_printf(m, "%s %pI4 %s\n",
280			im->m_class, &addr.s6_addr32[3], dom);
281	} else {
282		seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
283	}
284	return 0;
285}
286
287
288static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
289		struct in6_addr *addr)
290{
291	struct ip_map ip;
292	struct cache_head *ch;
293
294	strcpy(ip.m_class, class);
295	ip.m_addr = *addr;
296	ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
297				     hash_str(class, IP_HASHBITS) ^
298				     hash_ip6(addr));
299
300	if (ch)
301		return container_of(ch, struct ip_map, h);
302	else
303		return NULL;
304}
305
306static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
307		struct in6_addr *addr)
308{
309	struct sunrpc_net *sn;
310
311	sn = net_generic(net, sunrpc_net_id);
312	return __ip_map_lookup(sn->ip_map_cache, class, addr);
313}
314
315static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
316		struct unix_domain *udom, time64_t expiry)
317{
318	struct ip_map ip;
319	struct cache_head *ch;
320
321	ip.m_client = udom;
322	ip.h.flags = 0;
323	if (!udom)
324		set_bit(CACHE_NEGATIVE, &ip.h.flags);
325	ip.h.expiry_time = expiry;
326	ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
327				 hash_str(ipm->m_class, IP_HASHBITS) ^
328				 hash_ip6(&ipm->m_addr));
329	if (!ch)
330		return -ENOMEM;
331	cache_put(ch, cd);
332	return 0;
333}
334
335static inline int ip_map_update(struct net *net, struct ip_map *ipm,
336		struct unix_domain *udom, time64_t expiry)
337{
338	struct sunrpc_net *sn;
339
340	sn = net_generic(net, sunrpc_net_id);
341	return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
342}
343
344void svcauth_unix_purge(struct net *net)
345{
346	struct sunrpc_net *sn;
347
348	sn = net_generic(net, sunrpc_net_id);
349	cache_purge(sn->ip_map_cache);
350}
351EXPORT_SYMBOL_GPL(svcauth_unix_purge);
352
353static inline struct ip_map *
354ip_map_cached_get(struct svc_xprt *xprt)
355{
356	struct ip_map *ipm = NULL;
357	struct sunrpc_net *sn;
358
359	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
360		spin_lock(&xprt->xpt_lock);
361		ipm = xprt->xpt_auth_cache;
362		if (ipm != NULL) {
363			sn = net_generic(xprt->xpt_net, sunrpc_net_id);
364			if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
365				/*
366				 * The entry has been invalidated since it was
367				 * remembered, e.g. by a second mount from the
368				 * same IP address.
369				 */
370				xprt->xpt_auth_cache = NULL;
371				spin_unlock(&xprt->xpt_lock);
372				cache_put(&ipm->h, sn->ip_map_cache);
373				return NULL;
374			}
375			cache_get(&ipm->h);
376		}
377		spin_unlock(&xprt->xpt_lock);
378	}
379	return ipm;
380}
381
382static inline void
383ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
384{
385	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
386		spin_lock(&xprt->xpt_lock);
387		if (xprt->xpt_auth_cache == NULL) {
388			/* newly cached, keep the reference */
389			xprt->xpt_auth_cache = ipm;
390			ipm = NULL;
391		}
392		spin_unlock(&xprt->xpt_lock);
393	}
394	if (ipm) {
395		struct sunrpc_net *sn;
396
397		sn = net_generic(xprt->xpt_net, sunrpc_net_id);
398		cache_put(&ipm->h, sn->ip_map_cache);
399	}
400}
401
402void
403svcauth_unix_info_release(struct svc_xprt *xpt)
404{
405	struct ip_map *ipm;
406
407	ipm = xpt->xpt_auth_cache;
408	if (ipm != NULL) {
409		struct sunrpc_net *sn;
410
411		sn = net_generic(xpt->xpt_net, sunrpc_net_id);
412		cache_put(&ipm->h, sn->ip_map_cache);
413	}
414}
415
416/****************************************************************************
417 * auth.unix.gid cache
418 * simple cache to map a UID to a list of GIDs
419 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
420 */
421#define	GID_HASHBITS	8
422#define	GID_HASHMAX	(1<<GID_HASHBITS)
423
424struct unix_gid {
425	struct cache_head	h;
426	kuid_t			uid;
427	struct group_info	*gi;
428	struct rcu_head		rcu;
429};
430
431static int unix_gid_hash(kuid_t uid)
432{
433	return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
434}
435
436static void unix_gid_put(struct kref *kref)
437{
438	struct cache_head *item = container_of(kref, struct cache_head, ref);
439	struct unix_gid *ug = container_of(item, struct unix_gid, h);
440	if (test_bit(CACHE_VALID, &item->flags) &&
441	    !test_bit(CACHE_NEGATIVE, &item->flags))
442		put_group_info(ug->gi);
443	kfree_rcu(ug, rcu);
444}
445
446static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
447{
448	struct unix_gid *orig = container_of(corig, struct unix_gid, h);
449	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
450	return uid_eq(orig->uid, new->uid);
451}
452static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
453{
454	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
455	struct unix_gid *item = container_of(citem, struct unix_gid, h);
456	new->uid = item->uid;
457}
458static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
459{
460	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
461	struct unix_gid *item = container_of(citem, struct unix_gid, h);
462
463	get_group_info(item->gi);
464	new->gi = item->gi;
465}
466static struct cache_head *unix_gid_alloc(void)
467{
468	struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
469	if (g)
470		return &g->h;
471	else
472		return NULL;
473}
474
475static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
476{
477	return sunrpc_cache_pipe_upcall_timeout(cd, h);
478}
479
480static void unix_gid_request(struct cache_detail *cd,
481			     struct cache_head *h,
482			     char **bpp, int *blen)
483{
484	char tuid[20];
485	struct unix_gid *ug = container_of(h, struct unix_gid, h);
486
487	snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
488	qword_add(bpp, blen, tuid);
489	(*bpp)[-1] = '\n';
490}
491
492static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
493
494static int unix_gid_parse(struct cache_detail *cd,
495			char *mesg, int mlen)
496{
497	/* uid expiry Ngid gid0 gid1 ... gidN-1 */
498	int id;
499	kuid_t uid;
500	int gids;
501	int rv;
502	int i;
503	int err;
504	time64_t expiry;
505	struct unix_gid ug, *ugp;
506
507	if (mesg[mlen - 1] != '\n')
508		return -EINVAL;
509	mesg[mlen-1] = 0;
510
511	rv = get_int(&mesg, &id);
512	if (rv)
513		return -EINVAL;
514	uid = make_kuid(current_user_ns(), id);
515	ug.uid = uid;
516
517	expiry = get_expiry(&mesg);
518	if (expiry == 0)
519		return -EINVAL;
520
521	rv = get_int(&mesg, &gids);
522	if (rv || gids < 0 || gids > 8192)
523		return -EINVAL;
524
525	ug.gi = groups_alloc(gids);
526	if (!ug.gi)
527		return -ENOMEM;
528
529	for (i = 0 ; i < gids ; i++) {
530		int gid;
531		kgid_t kgid;
532		rv = get_int(&mesg, &gid);
533		err = -EINVAL;
534		if (rv)
535			goto out;
536		kgid = make_kgid(current_user_ns(), gid);
537		if (!gid_valid(kgid))
538			goto out;
539		ug.gi->gid[i] = kgid;
540	}
541
542	groups_sort(ug.gi);
543	ugp = unix_gid_lookup(cd, uid);
544	if (ugp) {
545		struct cache_head *ch;
546		ug.h.flags = 0;
547		ug.h.expiry_time = expiry;
548		ch = sunrpc_cache_update(cd,
549					 &ug.h, &ugp->h,
550					 unix_gid_hash(uid));
551		if (!ch)
552			err = -ENOMEM;
553		else {
554			err = 0;
555			cache_put(ch, cd);
556		}
557	} else
558		err = -ENOMEM;
559 out:
560	if (ug.gi)
561		put_group_info(ug.gi);
562	return err;
563}
564
565static int unix_gid_show(struct seq_file *m,
566			 struct cache_detail *cd,
567			 struct cache_head *h)
568{
569	struct user_namespace *user_ns = m->file->f_cred->user_ns;
570	struct unix_gid *ug;
571	int i;
572	int glen;
573
574	if (h == NULL) {
575		seq_puts(m, "#uid cnt: gids...\n");
576		return 0;
577	}
578	ug = container_of(h, struct unix_gid, h);
579	if (test_bit(CACHE_VALID, &h->flags) &&
580	    !test_bit(CACHE_NEGATIVE, &h->flags))
581		glen = ug->gi->ngroups;
582	else
583		glen = 0;
584
585	seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
586	for (i = 0; i < glen; i++)
587		seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
588	seq_printf(m, "\n");
589	return 0;
590}
591
592static const struct cache_detail unix_gid_cache_template = {
593	.owner		= THIS_MODULE,
594	.hash_size	= GID_HASHMAX,
595	.name		= "auth.unix.gid",
596	.cache_put	= unix_gid_put,
597	.cache_upcall	= unix_gid_upcall,
598	.cache_request	= unix_gid_request,
599	.cache_parse	= unix_gid_parse,
600	.cache_show	= unix_gid_show,
601	.match		= unix_gid_match,
602	.init		= unix_gid_init,
603	.update		= unix_gid_update,
604	.alloc		= unix_gid_alloc,
605};
606
607int unix_gid_cache_create(struct net *net)
608{
609	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
610	struct cache_detail *cd;
611	int err;
612
613	cd = cache_create_net(&unix_gid_cache_template, net);
614	if (IS_ERR(cd))
615		return PTR_ERR(cd);
616	err = cache_register_net(cd, net);
617	if (err) {
618		cache_destroy_net(cd, net);
619		return err;
620	}
621	sn->unix_gid_cache = cd;
622	return 0;
623}
624
625void unix_gid_cache_destroy(struct net *net)
626{
627	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
628	struct cache_detail *cd = sn->unix_gid_cache;
629
630	sn->unix_gid_cache = NULL;
631	cache_purge(cd);
632	cache_unregister_net(cd, net);
633	cache_destroy_net(cd, net);
634}
635
636static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
637{
638	struct unix_gid ug;
639	struct cache_head *ch;
640
641	ug.uid = uid;
642	ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
643	if (ch)
644		return container_of(ch, struct unix_gid, h);
645	else
646		return NULL;
647}
648
649static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
650{
651	struct unix_gid *ug;
652	struct group_info *gi;
653	int ret;
654	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
655					    sunrpc_net_id);
656
657	ug = unix_gid_lookup(sn->unix_gid_cache, uid);
658	if (!ug)
659		return ERR_PTR(-EAGAIN);
660	ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
661	switch (ret) {
662	case -ENOENT:
663		return ERR_PTR(-ENOENT);
664	case -ETIMEDOUT:
665		return ERR_PTR(-ESHUTDOWN);
666	case 0:
667		gi = get_group_info(ug->gi);
668		cache_put(&ug->h, sn->unix_gid_cache);
669		return gi;
670	default:
671		return ERR_PTR(-EAGAIN);
672	}
673}
674
675int
676svcauth_unix_set_client(struct svc_rqst *rqstp)
677{
678	struct sockaddr_in *sin;
679	struct sockaddr_in6 *sin6, sin6_storage;
680	struct ip_map *ipm;
681	struct group_info *gi;
682	struct svc_cred *cred = &rqstp->rq_cred;
683	struct svc_xprt *xprt = rqstp->rq_xprt;
684	struct net *net = xprt->xpt_net;
685	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
686
687	switch (rqstp->rq_addr.ss_family) {
688	case AF_INET:
689		sin = svc_addr_in(rqstp);
690		sin6 = &sin6_storage;
691		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
692		break;
693	case AF_INET6:
694		sin6 = svc_addr_in6(rqstp);
695		break;
696	default:
697		BUG();
698	}
699
700	rqstp->rq_client = NULL;
701	if (rqstp->rq_proc == 0)
702		return SVC_OK;
703
704	ipm = ip_map_cached_get(xprt);
705	if (ipm == NULL)
706		ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
707				    &sin6->sin6_addr);
708
709	if (ipm == NULL)
710		return SVC_DENIED;
711
712	switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
713		default:
714			BUG();
715		case -ETIMEDOUT:
716			return SVC_CLOSE;
717		case -EAGAIN:
718			return SVC_DROP;
719		case -ENOENT:
720			return SVC_DENIED;
721		case 0:
722			rqstp->rq_client = &ipm->m_client->h;
723			kref_get(&rqstp->rq_client->ref);
724			ip_map_cached_put(xprt, ipm);
725			break;
726	}
727
728	gi = unix_gid_find(cred->cr_uid, rqstp);
729	switch (PTR_ERR(gi)) {
730	case -EAGAIN:
731		return SVC_DROP;
732	case -ESHUTDOWN:
733		return SVC_CLOSE;
734	case -ENOENT:
735		break;
736	default:
737		put_group_info(cred->cr_group_info);
738		cred->cr_group_info = gi;
739	}
740	return SVC_OK;
741}
742
743EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
744
745static int
746svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
747{
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;
751
752	if (argv->iov_len < 3*4)
753		return SVC_GARBAGE;
754
755	if (svc_getu32(argv) != 0) {
756		dprintk("svc: bad null cred\n");
757		*authp = rpc_autherr_badcred;
758		return SVC_DENIED;
759	}
760	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
761		dprintk("svc: bad null verf\n");
762		*authp = rpc_autherr_badverf;
763		return SVC_DENIED;
764	}
765
766	/* Signal that mapping to nobody uid/gid is required */
767	cred->cr_uid = INVALID_UID;
768	cred->cr_gid = INVALID_GID;
769	cred->cr_group_info = groups_alloc(0);
770	if (cred->cr_group_info == NULL)
771		return SVC_CLOSE; /* kmalloc failure - client must retry */
772
773	/* Put NULL verifier */
774	svc_putnl(resv, RPC_AUTH_NULL);
775	svc_putnl(resv, 0);
776
777	rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
778	return SVC_OK;
779}
780
781static int
782svcauth_null_release(struct svc_rqst *rqstp)
783{
784	if (rqstp->rq_client)
785		auth_domain_put(rqstp->rq_client);
786	rqstp->rq_client = NULL;
787	if (rqstp->rq_cred.cr_group_info)
788		put_group_info(rqstp->rq_cred.cr_group_info);
789	rqstp->rq_cred.cr_group_info = NULL;
790
791	return 0; /* don't drop */
792}
793
794
795struct auth_ops svcauth_null = {
796	.name		= "null",
797	.owner		= THIS_MODULE,
798	.flavour	= RPC_AUTH_NULL,
799	.accept 	= svcauth_null_accept,
800	.release	= svcauth_null_release,
801	.set_client	= svcauth_unix_set_client,
802};
803
804
805static int
806svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
807{
808	struct kvec	*argv = &rqstp->rq_arg.head[0];
809	struct kvec	*resv = &rqstp->rq_res.head[0];
810	struct svc_cred	*cred = &rqstp->rq_cred;
811	struct user_namespace *userns;
812	u32		slen, i;
813	int		len   = argv->iov_len;
814
815	if ((len -= 3*4) < 0)
816		return SVC_GARBAGE;
817
818	svc_getu32(argv);			/* length */
819	svc_getu32(argv);			/* time stamp */
820	slen = XDR_QUADLEN(svc_getnl(argv));	/* machname length */
821	if (slen > 64 || (len -= (slen + 3)*4) < 0)
822		goto badcred;
823	argv->iov_base = (void*)((__be32*)argv->iov_base + slen);	/* skip machname */
824	argv->iov_len -= slen*4;
825	/*
826	 * Note: we skip uid_valid()/gid_valid() checks here for
827	 * backwards compatibility with clients that use -1 id's.
828	 * Instead, -1 uid or gid is later mapped to the
829	 * (export-specific) anonymous id by nfsd_setuser.
830	 * Supplementary gid's will be left alone.
831	 */
832	userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
833		rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
834	cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
835	cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
836	slen = svc_getnl(argv);			/* gids length */
837	if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
838		goto badcred;
839	cred->cr_group_info = groups_alloc(slen);
840	if (cred->cr_group_info == NULL)
841		return SVC_CLOSE;
842	for (i = 0; i < slen; i++) {
843		kgid_t kgid = make_kgid(userns, svc_getnl(argv));
844		cred->cr_group_info->gid[i] = kgid;
845	}
846	groups_sort(cred->cr_group_info);
847	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
848		*authp = rpc_autherr_badverf;
849		return SVC_DENIED;
850	}
851
852	/* Put NULL verifier */
853	svc_putnl(resv, RPC_AUTH_NULL);
854	svc_putnl(resv, 0);
855
856	rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
857	return SVC_OK;
858
859badcred:
860	*authp = rpc_autherr_badcred;
861	return SVC_DENIED;
862}
863
864static int
865svcauth_unix_release(struct svc_rqst *rqstp)
866{
867	/* Verifier (such as it is) is already in place.
868	 */
869	if (rqstp->rq_client)
870		auth_domain_put(rqstp->rq_client);
871	rqstp->rq_client = NULL;
872	if (rqstp->rq_cred.cr_group_info)
873		put_group_info(rqstp->rq_cred.cr_group_info);
874	rqstp->rq_cred.cr_group_info = NULL;
875
876	return 0;
877}
878
879
880struct auth_ops svcauth_unix = {
881	.name		= "unix",
882	.owner		= THIS_MODULE,
883	.flavour	= RPC_AUTH_UNIX,
884	.accept 	= svcauth_unix_accept,
885	.release	= svcauth_unix_release,
886	.domain_release	= svcauth_unix_domain_release,
887	.set_client	= svcauth_unix_set_client,
888};
889
890static const struct cache_detail ip_map_cache_template = {
891	.owner		= THIS_MODULE,
892	.hash_size	= IP_HASHMAX,
893	.name		= "auth.unix.ip",
894	.cache_put	= ip_map_put,
895	.cache_upcall	= ip_map_upcall,
896	.cache_request	= ip_map_request,
897	.cache_parse	= ip_map_parse,
898	.cache_show	= ip_map_show,
899	.match		= ip_map_match,
900	.init		= ip_map_init,
901	.update		= update,
902	.alloc		= ip_map_alloc,
903};
904
905int ip_map_cache_create(struct net *net)
906{
907	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
908	struct cache_detail *cd;
909	int err;
910
911	cd = cache_create_net(&ip_map_cache_template, net);
912	if (IS_ERR(cd))
913		return PTR_ERR(cd);
914	err = cache_register_net(cd, net);
915	if (err) {
916		cache_destroy_net(cd, net);
917		return err;
918	}
919	sn->ip_map_cache = cd;
920	return 0;
921}
922
923void ip_map_cache_destroy(struct net *net)
924{
925	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
926	struct cache_detail *cd = sn->ip_map_cache;
927
928	sn->ip_map_cache = NULL;
929	cache_purge(cd);
930	cache_unregister_net(cd, net);
931	cache_destroy_net(cd, net);
932}