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
335void svcauth_unix_purge(struct net *net)
336{
337	struct sunrpc_net *sn;
338
339	sn = net_generic(net, sunrpc_net_id);
340	cache_purge(sn->ip_map_cache);
341}
342EXPORT_SYMBOL_GPL(svcauth_unix_purge);
343
344static inline struct ip_map *
345ip_map_cached_get(struct svc_xprt *xprt)
346{
347	struct ip_map *ipm = NULL;
348	struct sunrpc_net *sn;
349
350	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
351		spin_lock(&xprt->xpt_lock);
352		ipm = xprt->xpt_auth_cache;
353		if (ipm != NULL) {
354			sn = net_generic(xprt->xpt_net, sunrpc_net_id);
355			if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
356				/*
357				 * The entry has been invalidated since it was
358				 * remembered, e.g. by a second mount from the
359				 * same IP address.
360				 */
361				xprt->xpt_auth_cache = NULL;
362				spin_unlock(&xprt->xpt_lock);
363				cache_put(&ipm->h, sn->ip_map_cache);
364				return NULL;
365			}
366			cache_get(&ipm->h);
367		}
368		spin_unlock(&xprt->xpt_lock);
369	}
370	return ipm;
371}
372
373static inline void
374ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
375{
376	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
377		spin_lock(&xprt->xpt_lock);
378		if (xprt->xpt_auth_cache == NULL) {
379			/* newly cached, keep the reference */
380			xprt->xpt_auth_cache = ipm;
381			ipm = NULL;
382		}
383		spin_unlock(&xprt->xpt_lock);
384	}
385	if (ipm) {
386		struct sunrpc_net *sn;
387
388		sn = net_generic(xprt->xpt_net, sunrpc_net_id);
389		cache_put(&ipm->h, sn->ip_map_cache);
390	}
391}
392
393void
394svcauth_unix_info_release(struct svc_xprt *xpt)
395{
396	struct ip_map *ipm;
397
398	ipm = xpt->xpt_auth_cache;
399	if (ipm != NULL) {
400		struct sunrpc_net *sn;
401
402		sn = net_generic(xpt->xpt_net, sunrpc_net_id);
403		cache_put(&ipm->h, sn->ip_map_cache);
404	}
405}
406
407/****************************************************************************
408 * auth.unix.gid cache
409 * simple cache to map a UID to a list of GIDs
410 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
411 */
412#define	GID_HASHBITS	8
413#define	GID_HASHMAX	(1<<GID_HASHBITS)
414
415struct unix_gid {
416	struct cache_head	h;
417	kuid_t			uid;
418	struct group_info	*gi;
419	struct rcu_head		rcu;
420};
421
422static int unix_gid_hash(kuid_t uid)
423{
424	return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
425}
426
427static void unix_gid_put(struct kref *kref)
428{
429	struct cache_head *item = container_of(kref, struct cache_head, ref);
430	struct unix_gid *ug = container_of(item, struct unix_gid, h);
431	if (test_bit(CACHE_VALID, &item->flags) &&
432	    !test_bit(CACHE_NEGATIVE, &item->flags))
433		put_group_info(ug->gi);
434	kfree_rcu(ug, rcu);
435}
436
437static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
438{
439	struct unix_gid *orig = container_of(corig, struct unix_gid, h);
440	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
441	return uid_eq(orig->uid, new->uid);
442}
443static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
444{
445	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
446	struct unix_gid *item = container_of(citem, struct unix_gid, h);
447	new->uid = item->uid;
448}
449static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
450{
451	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
452	struct unix_gid *item = container_of(citem, struct unix_gid, h);
453
454	get_group_info(item->gi);
455	new->gi = item->gi;
456}
457static struct cache_head *unix_gid_alloc(void)
458{
459	struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
460	if (g)
461		return &g->h;
462	else
463		return NULL;
464}
465
466static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
467{
468	return sunrpc_cache_pipe_upcall_timeout(cd, h);
469}
470
471static void unix_gid_request(struct cache_detail *cd,
472			     struct cache_head *h,
473			     char **bpp, int *blen)
474{
475	char tuid[20];
476	struct unix_gid *ug = container_of(h, struct unix_gid, h);
477
478	snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
479	qword_add(bpp, blen, tuid);
480	(*bpp)[-1] = '\n';
481}
482
483static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
484
485static int unix_gid_parse(struct cache_detail *cd,
486			char *mesg, int mlen)
487{
488	/* uid expiry Ngid gid0 gid1 ... gidN-1 */
489	int id;
490	kuid_t uid;
491	int gids;
492	int rv;
493	int i;
494	int err;
495	time64_t expiry;
496	struct unix_gid ug, *ugp;
497
498	if (mesg[mlen - 1] != '\n')
499		return -EINVAL;
500	mesg[mlen-1] = 0;
501
502	rv = get_int(&mesg, &id);
503	if (rv)
504		return -EINVAL;
505	uid = make_kuid(current_user_ns(), id);
506	ug.uid = uid;
507
508	expiry = get_expiry(&mesg);
509	if (expiry == 0)
510		return -EINVAL;
511
512	rv = get_int(&mesg, &gids);
513	if (rv || gids < 0 || gids > 8192)
514		return -EINVAL;
515
516	ug.gi = groups_alloc(gids);
517	if (!ug.gi)
518		return -ENOMEM;
519
520	for (i = 0 ; i < gids ; i++) {
521		int gid;
522		kgid_t kgid;
523		rv = get_int(&mesg, &gid);
524		err = -EINVAL;
525		if (rv)
526			goto out;
527		kgid = make_kgid(current_user_ns(), gid);
528		if (!gid_valid(kgid))
529			goto out;
530		ug.gi->gid[i] = kgid;
531	}
532
533	groups_sort(ug.gi);
534	ugp = unix_gid_lookup(cd, uid);
535	if (ugp) {
536		struct cache_head *ch;
537		ug.h.flags = 0;
538		ug.h.expiry_time = expiry;
539		ch = sunrpc_cache_update(cd,
540					 &ug.h, &ugp->h,
541					 unix_gid_hash(uid));
542		if (!ch)
543			err = -ENOMEM;
544		else {
545			err = 0;
546			cache_put(ch, cd);
547		}
548	} else
549		err = -ENOMEM;
550 out:
551	if (ug.gi)
552		put_group_info(ug.gi);
553	return err;
554}
555
556static int unix_gid_show(struct seq_file *m,
557			 struct cache_detail *cd,
558			 struct cache_head *h)
559{
560	struct user_namespace *user_ns = m->file->f_cred->user_ns;
561	struct unix_gid *ug;
562	int i;
563	int glen;
564
565	if (h == NULL) {
566		seq_puts(m, "#uid cnt: gids...\n");
567		return 0;
568	}
569	ug = container_of(h, struct unix_gid, h);
570	if (test_bit(CACHE_VALID, &h->flags) &&
571	    !test_bit(CACHE_NEGATIVE, &h->flags))
572		glen = ug->gi->ngroups;
573	else
574		glen = 0;
575
576	seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
577	for (i = 0; i < glen; i++)
578		seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
579	seq_printf(m, "\n");
580	return 0;
581}
582
583static const struct cache_detail unix_gid_cache_template = {
584	.owner		= THIS_MODULE,
585	.hash_size	= GID_HASHMAX,
586	.name		= "auth.unix.gid",
587	.cache_put	= unix_gid_put,
588	.cache_upcall	= unix_gid_upcall,
589	.cache_request	= unix_gid_request,
590	.cache_parse	= unix_gid_parse,
591	.cache_show	= unix_gid_show,
592	.match		= unix_gid_match,
593	.init		= unix_gid_init,
594	.update		= unix_gid_update,
595	.alloc		= unix_gid_alloc,
596};
597
598int unix_gid_cache_create(struct net *net)
599{
600	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
601	struct cache_detail *cd;
602	int err;
603
604	cd = cache_create_net(&unix_gid_cache_template, net);
605	if (IS_ERR(cd))
606		return PTR_ERR(cd);
607	err = cache_register_net(cd, net);
608	if (err) {
609		cache_destroy_net(cd, net);
610		return err;
611	}
612	sn->unix_gid_cache = cd;
613	return 0;
614}
615
616void unix_gid_cache_destroy(struct net *net)
617{
618	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
619	struct cache_detail *cd = sn->unix_gid_cache;
620
621	sn->unix_gid_cache = NULL;
622	cache_purge(cd);
623	cache_unregister_net(cd, net);
624	cache_destroy_net(cd, net);
625}
626
627static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
628{
629	struct unix_gid ug;
630	struct cache_head *ch;
631
632	ug.uid = uid;
633	ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
634	if (ch)
635		return container_of(ch, struct unix_gid, h);
636	else
637		return NULL;
638}
639
640static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
641{
642	struct unix_gid *ug;
643	struct group_info *gi;
644	int ret;
645	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
646					    sunrpc_net_id);
647
648	ug = unix_gid_lookup(sn->unix_gid_cache, uid);
649	if (!ug)
650		return ERR_PTR(-EAGAIN);
651	ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
652	switch (ret) {
653	case -ENOENT:
654		return ERR_PTR(-ENOENT);
655	case -ETIMEDOUT:
656		return ERR_PTR(-ESHUTDOWN);
657	case 0:
658		gi = get_group_info(ug->gi);
659		cache_put(&ug->h, sn->unix_gid_cache);
660		return gi;
661	default:
662		return ERR_PTR(-EAGAIN);
663	}
664}
665
666int
667svcauth_unix_set_client(struct svc_rqst *rqstp)
668{
669	struct sockaddr_in *sin;
670	struct sockaddr_in6 *sin6, sin6_storage;
671	struct ip_map *ipm;
672	struct group_info *gi;
673	struct svc_cred *cred = &rqstp->rq_cred;
674	struct svc_xprt *xprt = rqstp->rq_xprt;
675	struct net *net = xprt->xpt_net;
676	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
677
678	switch (rqstp->rq_addr.ss_family) {
679	case AF_INET:
680		sin = svc_addr_in(rqstp);
681		sin6 = &sin6_storage;
682		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
683		break;
684	case AF_INET6:
685		sin6 = svc_addr_in6(rqstp);
686		break;
687	default:
688		BUG();
689	}
690
691	rqstp->rq_client = NULL;
692	if (rqstp->rq_proc == 0)
693		return SVC_OK;
694
695	ipm = ip_map_cached_get(xprt);
696	if (ipm == NULL)
697		ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
698				    &sin6->sin6_addr);
699
700	if (ipm == NULL)
701		return SVC_DENIED;
702
703	switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
704		default:
705			BUG();
706		case -ETIMEDOUT:
707			return SVC_CLOSE;
708		case -EAGAIN:
709			return SVC_DROP;
710		case -ENOENT:
711			return SVC_DENIED;
712		case 0:
713			rqstp->rq_client = &ipm->m_client->h;
714			kref_get(&rqstp->rq_client->ref);
715			ip_map_cached_put(xprt, ipm);
716			break;
717	}
718
719	gi = unix_gid_find(cred->cr_uid, rqstp);
720	switch (PTR_ERR(gi)) {
721	case -EAGAIN:
722		return SVC_DROP;
723	case -ESHUTDOWN:
724		return SVC_CLOSE;
725	case -ENOENT:
726		break;
727	default:
728		put_group_info(cred->cr_group_info);
729		cred->cr_group_info = gi;
730	}
731	return SVC_OK;
732}
733
734EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
735
736static int
737svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
738{
739	struct kvec	*argv = &rqstp->rq_arg.head[0];
740	struct kvec	*resv = &rqstp->rq_res.head[0];
741	struct svc_cred	*cred = &rqstp->rq_cred;
742
743	if (argv->iov_len < 3*4)
744		return SVC_GARBAGE;
745
746	if (svc_getu32(argv) != 0) {
747		dprintk("svc: bad null cred\n");
748		*authp = rpc_autherr_badcred;
749		return SVC_DENIED;
750	}
751	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
752		dprintk("svc: bad null verf\n");
753		*authp = rpc_autherr_badverf;
754		return SVC_DENIED;
755	}
756
757	/* Signal that mapping to nobody uid/gid is required */
758	cred->cr_uid = INVALID_UID;
759	cred->cr_gid = INVALID_GID;
760	cred->cr_group_info = groups_alloc(0);
761	if (cred->cr_group_info == NULL)
762		return SVC_CLOSE; /* kmalloc failure - client must retry */
763
764	/* Put NULL verifier */
765	svc_putnl(resv, RPC_AUTH_NULL);
766	svc_putnl(resv, 0);
767
768	rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
769	return SVC_OK;
770}
771
772static int
773svcauth_null_release(struct svc_rqst *rqstp)
774{
775	if (rqstp->rq_client)
776		auth_domain_put(rqstp->rq_client);
777	rqstp->rq_client = NULL;
778	if (rqstp->rq_cred.cr_group_info)
779		put_group_info(rqstp->rq_cred.cr_group_info);
780	rqstp->rq_cred.cr_group_info = NULL;
781
782	return 0; /* don't drop */
783}
784
785
786struct auth_ops svcauth_null = {
787	.name		= "null",
788	.owner		= THIS_MODULE,
789	.flavour	= RPC_AUTH_NULL,
790	.accept 	= svcauth_null_accept,
791	.release	= svcauth_null_release,
792	.set_client	= svcauth_unix_set_client,
793};
794
795
796static int
797svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
798{
799	struct kvec	*argv = &rqstp->rq_arg.head[0];
800	struct kvec	*resv = &rqstp->rq_res.head[0];
801	struct svc_cred	*cred = &rqstp->rq_cred;
802	struct user_namespace *userns;
803	u32		slen, i;
804	int		len   = argv->iov_len;
805
806	if ((len -= 3*4) < 0)
807		return SVC_GARBAGE;
808
809	svc_getu32(argv);			/* length */
810	svc_getu32(argv);			/* time stamp */
811	slen = XDR_QUADLEN(svc_getnl(argv));	/* machname length */
812	if (slen > 64 || (len -= (slen + 3)*4) < 0)
813		goto badcred;
814	argv->iov_base = (void*)((__be32*)argv->iov_base + slen);	/* skip machname */
815	argv->iov_len -= slen*4;
816	/*
817	 * Note: we skip uid_valid()/gid_valid() checks here for
818	 * backwards compatibility with clients that use -1 id's.
819	 * Instead, -1 uid or gid is later mapped to the
820	 * (export-specific) anonymous id by nfsd_setuser.
821	 * Supplementary gid's will be left alone.
822	 */
823	userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
824		rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
825	cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
826	cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
827	slen = svc_getnl(argv);			/* gids length */
828	if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
829		goto badcred;
830	cred->cr_group_info = groups_alloc(slen);
831	if (cred->cr_group_info == NULL)
832		return SVC_CLOSE;
833	for (i = 0; i < slen; i++) {
834		kgid_t kgid = make_kgid(userns, svc_getnl(argv));
835		cred->cr_group_info->gid[i] = kgid;
836	}
837	groups_sort(cred->cr_group_info);
838	if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
839		*authp = rpc_autherr_badverf;
840		return SVC_DENIED;
841	}
842
843	/* Put NULL verifier */
844	svc_putnl(resv, RPC_AUTH_NULL);
845	svc_putnl(resv, 0);
846
847	rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
848	return SVC_OK;
849
850badcred:
851	*authp = rpc_autherr_badcred;
852	return SVC_DENIED;
853}
854
855static int
856svcauth_unix_release(struct svc_rqst *rqstp)
857{
858	/* Verifier (such as it is) is already in place.
859	 */
860	if (rqstp->rq_client)
861		auth_domain_put(rqstp->rq_client);
862	rqstp->rq_client = NULL;
863	if (rqstp->rq_cred.cr_group_info)
864		put_group_info(rqstp->rq_cred.cr_group_info);
865	rqstp->rq_cred.cr_group_info = NULL;
866
867	return 0;
868}
869
870
871struct auth_ops svcauth_unix = {
872	.name		= "unix",
873	.owner		= THIS_MODULE,
874	.flavour	= RPC_AUTH_UNIX,
875	.accept 	= svcauth_unix_accept,
876	.release	= svcauth_unix_release,
877	.domain_release	= svcauth_unix_domain_release,
878	.set_client	= svcauth_unix_set_client,
879};
880
881static const struct cache_detail ip_map_cache_template = {
882	.owner		= THIS_MODULE,
883	.hash_size	= IP_HASHMAX,
884	.name		= "auth.unix.ip",
885	.cache_put	= ip_map_put,
886	.cache_upcall	= ip_map_upcall,
887	.cache_request	= ip_map_request,
888	.cache_parse	= ip_map_parse,
889	.cache_show	= ip_map_show,
890	.match		= ip_map_match,
891	.init		= ip_map_init,
892	.update		= update,
893	.alloc		= ip_map_alloc,
894};
895
896int ip_map_cache_create(struct net *net)
897{
898	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
899	struct cache_detail *cd;
900	int err;
901
902	cd = cache_create_net(&ip_map_cache_template, net);
903	if (IS_ERR(cd))
904		return PTR_ERR(cd);
905	err = cache_register_net(cd, net);
906	if (err) {
907		cache_destroy_net(cd, net);
908		return err;
909	}
910	sn->ip_map_cache = cd;
911	return 0;
912}
913
914void ip_map_cache_destroy(struct net *net)
915{
916	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
917	struct cache_detail *cd = sn->ip_map_cache;
918
919	sn->ip_map_cache = NULL;
920	cache_purge(cd);
921	cache_unregister_net(cd, net);
922	cache_destroy_net(cd, net);
923}