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#include <trace/events/sunrpc.h>
  21
  22#define RPCDBG_FACILITY	RPCDBG_AUTH
  23
  24#include "netns.h"
  25
  26/*
  27 * AUTHUNIX and AUTHNULL credentials are both handled here.
  28 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
  29 * are always nobody (-2).  i.e. we do the same IP address checks for
  30 * AUTHNULL as for AUTHUNIX, and that is done here.
  31 */
  32
  33
  34struct unix_domain {
  35	struct auth_domain	h;
  36	/* other stuff later */
  37};
  38
  39extern struct auth_ops svcauth_null;
  40extern struct auth_ops svcauth_unix;
  41extern struct auth_ops svcauth_tls;
  42
  43static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
  44{
  45	struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
  46	struct unix_domain *ud = container_of(dom, struct unix_domain, h);
  47
  48	kfree(dom->name);
  49	kfree(ud);
  50}
  51
  52static void svcauth_unix_domain_release(struct auth_domain *dom)
  53{
  54	call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
  55}
  56
  57struct auth_domain *unix_domain_find(char *name)
  58{
  59	struct auth_domain *rv;
  60	struct unix_domain *new = NULL;
  61
  62	rv = auth_domain_find(name);
  63	while(1) {
  64		if (rv) {
  65			if (new && rv != &new->h)
  66				svcauth_unix_domain_release(&new->h);
  67
  68			if (rv->flavour != &svcauth_unix) {
  69				auth_domain_put(rv);
  70				return NULL;
  71			}
  72			return rv;
  73		}
  74
  75		new = kmalloc(sizeof(*new), GFP_KERNEL);
  76		if (new == NULL)
  77			return NULL;
  78		kref_init(&new->h.ref);
  79		new->h.name = kstrdup(name, GFP_KERNEL);
  80		if (new->h.name == NULL) {
  81			kfree(new);
  82			return NULL;
  83		}
  84		new->h.flavour = &svcauth_unix;
  85		rv = auth_domain_lookup(name, &new->h);
  86	}
  87}
  88EXPORT_SYMBOL_GPL(unix_domain_find);
  89
  90
  91/**************************************************
  92 * cache for IP address to unix_domain
  93 * as needed by AUTH_UNIX
  94 */
  95#define	IP_HASHBITS	8
  96#define	IP_HASHMAX	(1<<IP_HASHBITS)
  97
  98struct ip_map {
  99	struct cache_head	h;
 100	char			m_class[8]; /* e.g. "nfsd" */
 101	struct in6_addr		m_addr;
 102	struct unix_domain	*m_client;
 103	struct rcu_head		m_rcu;
 104};
 105
 106static void ip_map_put(struct kref *kref)
 107{
 108	struct cache_head *item = container_of(kref, struct cache_head, ref);
 109	struct ip_map *im = container_of(item, struct ip_map,h);
 110
 111	if (test_bit(CACHE_VALID, &item->flags) &&
 112	    !test_bit(CACHE_NEGATIVE, &item->flags))
 113		auth_domain_put(&im->m_client->h);
 114	kfree_rcu(im, m_rcu);
 115}
 116
 117static inline int hash_ip6(const struct in6_addr *ip)
 118{
 119	return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
 120}
 121static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
 122{
 123	struct ip_map *orig = container_of(corig, struct ip_map, h);
 124	struct ip_map *new = container_of(cnew, struct ip_map, h);
 125	return strcmp(orig->m_class, new->m_class) == 0 &&
 126	       ipv6_addr_equal(&orig->m_addr, &new->m_addr);
 127}
 128static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
 129{
 130	struct ip_map *new = container_of(cnew, struct ip_map, h);
 131	struct ip_map *item = container_of(citem, struct ip_map, h);
 132
 133	strcpy(new->m_class, item->m_class);
 134	new->m_addr = item->m_addr;
 135}
 136static void update(struct cache_head *cnew, struct cache_head *citem)
 137{
 138	struct ip_map *new = container_of(cnew, struct ip_map, h);
 139	struct ip_map *item = container_of(citem, struct ip_map, h);
 140
 141	kref_get(&item->m_client->h.ref);
 142	new->m_client = item->m_client;
 143}
 144static struct cache_head *ip_map_alloc(void)
 145{
 146	struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
 147	if (i)
 148		return &i->h;
 149	else
 150		return NULL;
 151}
 152
 153static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
 154{
 155	return sunrpc_cache_pipe_upcall(cd, h);
 156}
 157
 158static void ip_map_request(struct cache_detail *cd,
 159				  struct cache_head *h,
 160				  char **bpp, int *blen)
 161{
 162	char text_addr[40];
 163	struct ip_map *im = container_of(h, struct ip_map, h);
 164
 165	if (ipv6_addr_v4mapped(&(im->m_addr))) {
 166		snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
 167	} else {
 168		snprintf(text_addr, 40, "%pI6", &im->m_addr);
 169	}
 170	qword_add(bpp, blen, im->m_class);
 171	qword_add(bpp, blen, text_addr);
 172	(*bpp)[-1] = '\n';
 173}
 174
 175static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
 176static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
 177
 178static int ip_map_parse(struct cache_detail *cd,
 179			  char *mesg, int mlen)
 180{
 181	/* class ipaddress [domainname] */
 182	/* should be safe just to use the start of the input buffer
 183	 * for scratch: */
 184	char *buf = mesg;
 185	int len;
 186	char class[8];
 187	union {
 188		struct sockaddr		sa;
 189		struct sockaddr_in	s4;
 190		struct sockaddr_in6	s6;
 191	} address;
 192	struct sockaddr_in6 sin6;
 193	int err;
 194
 195	struct ip_map *ipmp;
 196	struct auth_domain *dom;
 197	time64_t expiry;
 198
 199	if (mesg[mlen-1] != '\n')
 200		return -EINVAL;
 201	mesg[mlen-1] = 0;
 202
 203	/* class */
 204	len = qword_get(&mesg, class, sizeof(class));
 205	if (len <= 0) return -EINVAL;
 206
 207	/* ip address */
 208	len = qword_get(&mesg, buf, mlen);
 209	if (len <= 0) return -EINVAL;
 210
 211	if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
 212		return -EINVAL;
 213	switch (address.sa.sa_family) {
 214	case AF_INET:
 215		/* Form a mapped IPv4 address in sin6 */
 216		sin6.sin6_family = AF_INET6;
 217		ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
 218				&sin6.sin6_addr);
 219		break;
 220#if IS_ENABLED(CONFIG_IPV6)
 221	case AF_INET6:
 222		memcpy(&sin6, &address.s6, sizeof(sin6));
 223		break;
 224#endif
 225	default:
 226		return -EINVAL;
 227	}
 228
 229	err = get_expiry(&mesg, &expiry);
 230	if (err)
 231		return err;
 232
 233	/* domainname, or empty for NEGATIVE */
 234	len = qword_get(&mesg, buf, mlen);
 235	if (len < 0) return -EINVAL;
 236
 237	if (len) {
 238		dom = unix_domain_find(buf);
 239		if (dom == NULL)
 240			return -ENOENT;
 241	} else
 242		dom = NULL;
 243
 244	/* IPv6 scope IDs are ignored for now */
 245	ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
 246	if (ipmp) {
 247		err = __ip_map_update(cd, ipmp,
 248			     container_of(dom, struct unix_domain, h),
 249			     expiry);
 250	} else
 251		err = -ENOMEM;
 252
 253	if (dom)
 254		auth_domain_put(dom);
 255
 256	cache_flush();
 257	return err;
 258}
 259
 260static int ip_map_show(struct seq_file *m,
 261		       struct cache_detail *cd,
 262		       struct cache_head *h)
 263{
 264	struct ip_map *im;
 265	struct in6_addr addr;
 266	char *dom = "-no-domain-";
 267
 268	if (h == NULL) {
 269		seq_puts(m, "#class IP domain\n");
 270		return 0;
 271	}
 272	im = container_of(h, struct ip_map, h);
 273	/* class addr domain */
 274	addr = im->m_addr;
 275
 276	if (test_bit(CACHE_VALID, &h->flags) &&
 277	    !test_bit(CACHE_NEGATIVE, &h->flags))
 278		dom = im->m_client->h.name;
 279
 280	if (ipv6_addr_v4mapped(&addr)) {
 281		seq_printf(m, "%s %pI4 %s\n",
 282			im->m_class, &addr.s6_addr32[3], dom);
 283	} else {
 284		seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
 285	}
 286	return 0;
 287}
 288
 289
 290static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
 291		struct in6_addr *addr)
 292{
 293	struct ip_map ip;
 294	struct cache_head *ch;
 295
 296	strcpy(ip.m_class, class);
 297	ip.m_addr = *addr;
 298	ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
 299				     hash_str(class, IP_HASHBITS) ^
 300				     hash_ip6(addr));
 301
 302	if (ch)
 303		return container_of(ch, struct ip_map, h);
 304	else
 305		return NULL;
 306}
 307
 308static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
 309		struct unix_domain *udom, time64_t expiry)
 310{
 311	struct ip_map ip;
 312	struct cache_head *ch;
 313
 314	ip.m_client = udom;
 315	ip.h.flags = 0;
 316	if (!udom)
 317		set_bit(CACHE_NEGATIVE, &ip.h.flags);
 318	ip.h.expiry_time = expiry;
 319	ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
 320				 hash_str(ipm->m_class, IP_HASHBITS) ^
 321				 hash_ip6(&ipm->m_addr));
 322	if (!ch)
 323		return -ENOMEM;
 324	cache_put(ch, cd);
 325	return 0;
 326}
 327
 328void svcauth_unix_purge(struct net *net)
 329{
 330	struct sunrpc_net *sn;
 331
 332	sn = net_generic(net, sunrpc_net_id);
 333	cache_purge(sn->ip_map_cache);
 334}
 335EXPORT_SYMBOL_GPL(svcauth_unix_purge);
 336
 337static inline struct ip_map *
 338ip_map_cached_get(struct svc_xprt *xprt)
 339{
 340	struct ip_map *ipm = NULL;
 341	struct sunrpc_net *sn;
 342
 343	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 344		spin_lock(&xprt->xpt_lock);
 345		ipm = xprt->xpt_auth_cache;
 346		if (ipm != NULL) {
 347			sn = net_generic(xprt->xpt_net, sunrpc_net_id);
 348			if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
 349				/*
 350				 * The entry has been invalidated since it was
 351				 * remembered, e.g. by a second mount from the
 352				 * same IP address.
 353				 */
 354				xprt->xpt_auth_cache = NULL;
 355				spin_unlock(&xprt->xpt_lock);
 356				cache_put(&ipm->h, sn->ip_map_cache);
 357				return NULL;
 358			}
 359			cache_get(&ipm->h);
 360		}
 361		spin_unlock(&xprt->xpt_lock);
 362	}
 363	return ipm;
 364}
 365
 366static inline void
 367ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
 368{
 369	if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 370		spin_lock(&xprt->xpt_lock);
 371		if (xprt->xpt_auth_cache == NULL) {
 372			/* newly cached, keep the reference */
 373			xprt->xpt_auth_cache = ipm;
 374			ipm = NULL;
 375		}
 376		spin_unlock(&xprt->xpt_lock);
 377	}
 378	if (ipm) {
 379		struct sunrpc_net *sn;
 380
 381		sn = net_generic(xprt->xpt_net, sunrpc_net_id);
 382		cache_put(&ipm->h, sn->ip_map_cache);
 383	}
 384}
 385
 386void
 387svcauth_unix_info_release(struct svc_xprt *xpt)
 388{
 389	struct ip_map *ipm;
 390
 391	ipm = xpt->xpt_auth_cache;
 392	if (ipm != NULL) {
 393		struct sunrpc_net *sn;
 394
 395		sn = net_generic(xpt->xpt_net, sunrpc_net_id);
 396		cache_put(&ipm->h, sn->ip_map_cache);
 397	}
 398}
 399
 400/****************************************************************************
 401 * auth.unix.gid cache
 402 * simple cache to map a UID to a list of GIDs
 403 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
 404 */
 405#define	GID_HASHBITS	8
 406#define	GID_HASHMAX	(1<<GID_HASHBITS)
 407
 408struct unix_gid {
 409	struct cache_head	h;
 410	kuid_t			uid;
 411	struct group_info	*gi;
 412	struct rcu_head		rcu;
 413};
 414
 415static int unix_gid_hash(kuid_t uid)
 416{
 417	return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
 418}
 419
 420static void unix_gid_free(struct rcu_head *rcu)
 421{
 422	struct unix_gid *ug = container_of(rcu, struct unix_gid, rcu);
 423	struct cache_head *item = &ug->h;
 424
 425	if (test_bit(CACHE_VALID, &item->flags) &&
 426	    !test_bit(CACHE_NEGATIVE, &item->flags))
 427		put_group_info(ug->gi);
 428	kfree(ug);
 429}
 430
 431static void unix_gid_put(struct kref *kref)
 432{
 433	struct cache_head *item = container_of(kref, struct cache_head, ref);
 434	struct unix_gid *ug = container_of(item, struct unix_gid, h);
 435
 436	call_rcu(&ug->rcu, unix_gid_free);
 437}
 438
 439static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
 440{
 441	struct unix_gid *orig = container_of(corig, struct unix_gid, h);
 442	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 443	return uid_eq(orig->uid, new->uid);
 444}
 445static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
 446{
 447	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 448	struct unix_gid *item = container_of(citem, struct unix_gid, h);
 449	new->uid = item->uid;
 450}
 451static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
 452{
 453	struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 454	struct unix_gid *item = container_of(citem, struct unix_gid, h);
 455
 456	get_group_info(item->gi);
 457	new->gi = item->gi;
 458}
 459static struct cache_head *unix_gid_alloc(void)
 460{
 461	struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
 462	if (g)
 463		return &g->h;
 464	else
 465		return NULL;
 466}
 467
 468static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
 469{
 470	return sunrpc_cache_pipe_upcall_timeout(cd, h);
 471}
 472
 473static void unix_gid_request(struct cache_detail *cd,
 474			     struct cache_head *h,
 475			     char **bpp, int *blen)
 476{
 477	char tuid[20];
 478	struct unix_gid *ug = container_of(h, struct unix_gid, h);
 479
 480	snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
 481	qword_add(bpp, blen, tuid);
 482	(*bpp)[-1] = '\n';
 483}
 484
 485static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
 486
 487static int unix_gid_parse(struct cache_detail *cd,
 488			char *mesg, int mlen)
 489{
 490	/* uid expiry Ngid gid0 gid1 ... gidN-1 */
 491	int id;
 492	kuid_t uid;
 493	int gids;
 494	int rv;
 495	int i;
 496	int err;
 497	time64_t expiry;
 498	struct unix_gid ug, *ugp;
 499
 500	if (mesg[mlen - 1] != '\n')
 501		return -EINVAL;
 502	mesg[mlen-1] = 0;
 503
 504	rv = get_int(&mesg, &id);
 505	if (rv)
 506		return -EINVAL;
 507	uid = make_kuid(current_user_ns(), id);
 508	ug.uid = uid;
 509
 510	err = get_expiry(&mesg, &expiry);
 511	if (err)
 512		return err;
 513
 514	rv = get_int(&mesg, &gids);
 515	if (rv || gids < 0 || gids > 8192)
 516		return -EINVAL;
 517
 518	ug.gi = groups_alloc(gids);
 519	if (!ug.gi)
 520		return -ENOMEM;
 521
 522	for (i = 0 ; i < gids ; i++) {
 523		int gid;
 524		kgid_t kgid;
 525		rv = get_int(&mesg, &gid);
 526		err = -EINVAL;
 527		if (rv)
 528			goto out;
 529		kgid = make_kgid(current_user_ns(), gid);
 530		if (!gid_valid(kgid))
 531			goto out;
 532		ug.gi->gid[i] = kgid;
 533	}
 534
 535	groups_sort(ug.gi);
 536	ugp = unix_gid_lookup(cd, uid);
 537	if (ugp) {
 538		struct cache_head *ch;
 539		ug.h.flags = 0;
 540		ug.h.expiry_time = expiry;
 541		ch = sunrpc_cache_update(cd,
 542					 &ug.h, &ugp->h,
 543					 unix_gid_hash(uid));
 544		if (!ch)
 545			err = -ENOMEM;
 546		else {
 547			err = 0;
 548			cache_put(ch, cd);
 549		}
 550	} else
 551		err = -ENOMEM;
 552 out:
 553	if (ug.gi)
 554		put_group_info(ug.gi);
 555	return err;
 556}
 557
 558static int unix_gid_show(struct seq_file *m,
 559			 struct cache_detail *cd,
 560			 struct cache_head *h)
 561{
 562	struct user_namespace *user_ns = m->file->f_cred->user_ns;
 563	struct unix_gid *ug;
 564	int i;
 565	int glen;
 566
 567	if (h == NULL) {
 568		seq_puts(m, "#uid cnt: gids...\n");
 569		return 0;
 570	}
 571	ug = container_of(h, struct unix_gid, h);
 572	if (test_bit(CACHE_VALID, &h->flags) &&
 573	    !test_bit(CACHE_NEGATIVE, &h->flags))
 574		glen = ug->gi->ngroups;
 575	else
 576		glen = 0;
 577
 578	seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
 579	for (i = 0; i < glen; i++)
 580		seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
 581	seq_printf(m, "\n");
 582	return 0;
 583}
 584
 585static const struct cache_detail unix_gid_cache_template = {
 586	.owner		= THIS_MODULE,
 587	.hash_size	= GID_HASHMAX,
 588	.name		= "auth.unix.gid",
 589	.cache_put	= unix_gid_put,
 590	.cache_upcall	= unix_gid_upcall,
 591	.cache_request	= unix_gid_request,
 592	.cache_parse	= unix_gid_parse,
 593	.cache_show	= unix_gid_show,
 594	.match		= unix_gid_match,
 595	.init		= unix_gid_init,
 596	.update		= unix_gid_update,
 597	.alloc		= unix_gid_alloc,
 598};
 599
 600int unix_gid_cache_create(struct net *net)
 601{
 602	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 603	struct cache_detail *cd;
 604	int err;
 605
 606	cd = cache_create_net(&unix_gid_cache_template, net);
 607	if (IS_ERR(cd))
 608		return PTR_ERR(cd);
 609	err = cache_register_net(cd, net);
 610	if (err) {
 611		cache_destroy_net(cd, net);
 612		return err;
 613	}
 614	sn->unix_gid_cache = cd;
 615	return 0;
 616}
 617
 618void unix_gid_cache_destroy(struct net *net)
 619{
 620	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 621	struct cache_detail *cd = sn->unix_gid_cache;
 622
 623	sn->unix_gid_cache = NULL;
 624	cache_purge(cd);
 625	cache_unregister_net(cd, net);
 626	cache_destroy_net(cd, net);
 627}
 628
 629static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
 630{
 631	struct unix_gid ug;
 632	struct cache_head *ch;
 633
 634	ug.uid = uid;
 635	ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
 636	if (ch)
 637		return container_of(ch, struct unix_gid, h);
 638	else
 639		return NULL;
 640}
 641
 642static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
 643{
 644	struct unix_gid *ug;
 645	struct group_info *gi;
 646	int ret;
 647	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
 648					    sunrpc_net_id);
 649
 650	ug = unix_gid_lookup(sn->unix_gid_cache, uid);
 651	if (!ug)
 652		return ERR_PTR(-EAGAIN);
 653	ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
 654	switch (ret) {
 655	case -ENOENT:
 656		return ERR_PTR(-ENOENT);
 657	case -ETIMEDOUT:
 658		return ERR_PTR(-ESHUTDOWN);
 659	case 0:
 660		gi = get_group_info(ug->gi);
 661		cache_put(&ug->h, sn->unix_gid_cache);
 662		return gi;
 663	default:
 664		return ERR_PTR(-EAGAIN);
 665	}
 666}
 667
 668enum svc_auth_status
 669svcauth_unix_set_client(struct svc_rqst *rqstp)
 670{
 671	struct sockaddr_in *sin;
 672	struct sockaddr_in6 *sin6, sin6_storage;
 673	struct ip_map *ipm;
 674	struct group_info *gi;
 675	struct svc_cred *cred = &rqstp->rq_cred;
 676	struct svc_xprt *xprt = rqstp->rq_xprt;
 677	struct net *net = xprt->xpt_net;
 678	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 679
 680	switch (rqstp->rq_addr.ss_family) {
 681	case AF_INET:
 682		sin = svc_addr_in(rqstp);
 683		sin6 = &sin6_storage;
 684		ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
 685		break;
 686	case AF_INET6:
 687		sin6 = svc_addr_in6(rqstp);
 688		break;
 689	default:
 690		BUG();
 691	}
 692
 693	rqstp->rq_client = NULL;
 694	if (rqstp->rq_proc == 0)
 695		goto out;
 696
 697	rqstp->rq_auth_stat = rpc_autherr_badcred;
 698	ipm = ip_map_cached_get(xprt);
 699	if (ipm == NULL)
 700		ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
 
 701				    &sin6->sin6_addr);
 702
 703	if (ipm == NULL)
 704		return SVC_DENIED;
 705
 706	switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 707		default:
 708			BUG();
 709		case -ETIMEDOUT:
 710			return SVC_CLOSE;
 711		case -EAGAIN:
 712			return SVC_DROP;
 713		case -ENOENT:
 714			return SVC_DENIED;
 715		case 0:
 716			rqstp->rq_client = &ipm->m_client->h;
 717			kref_get(&rqstp->rq_client->ref);
 718			ip_map_cached_put(xprt, ipm);
 719			break;
 720	}
 721
 722	gi = unix_gid_find(cred->cr_uid, rqstp);
 723	switch (PTR_ERR(gi)) {
 724	case -EAGAIN:
 725		return SVC_DROP;
 726	case -ESHUTDOWN:
 727		return SVC_CLOSE;
 728	case -ENOENT:
 729		break;
 730	default:
 731		put_group_info(cred->cr_group_info);
 732		cred->cr_group_info = gi;
 733	}
 734
 735out:
 736	rqstp->rq_auth_stat = rpc_auth_ok;
 737	return SVC_OK;
 738}
 739EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
 740
 741/**
 742 * svcauth_null_accept - Decode and validate incoming RPC_AUTH_NULL credential
 743 * @rqstp: RPC transaction
 744 *
 745 * Return values:
 746 *   %SVC_OK: Both credential and verifier are valid
 747 *   %SVC_DENIED: Credential or verifier is not valid
 748 *   %SVC_GARBAGE: Failed to decode credential or verifier
 749 *   %SVC_CLOSE: Temporary failure
 750 *
 751 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
 752 */
 753static enum svc_auth_status
 754svcauth_null_accept(struct svc_rqst *rqstp)
 755{
 756	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 757	struct svc_cred	*cred = &rqstp->rq_cred;
 758	u32 flavor, len;
 759	void *body;
 760
 761	/* Length of Call's credential body field: */
 762	if (xdr_stream_decode_u32(xdr, &len) < 0)
 763		return SVC_GARBAGE;
 764	if (len != 0) {
 765		rqstp->rq_auth_stat = rpc_autherr_badcred;
 766		return SVC_DENIED;
 767	}
 768
 769	/* Call's verf field: */
 770	if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
 771		return SVC_GARBAGE;
 772	if (flavor != RPC_AUTH_NULL || len != 0) {
 773		rqstp->rq_auth_stat = rpc_autherr_badverf;
 774		return SVC_DENIED;
 775	}
 776
 777	/* Signal that mapping to nobody uid/gid is required */
 778	cred->cr_uid = INVALID_UID;
 779	cred->cr_gid = INVALID_GID;
 780	cred->cr_group_info = groups_alloc(0);
 781	if (cred->cr_group_info == NULL)
 782		return SVC_CLOSE; /* kmalloc failure - client must retry */
 783
 784	if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
 785					  RPC_AUTH_NULL, NULL, 0) < 0)
 786		return SVC_CLOSE;
 787	if (!svcxdr_set_accept_stat(rqstp))
 788		return SVC_CLOSE;
 789
 790	rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
 791	return SVC_OK;
 792}
 793
 794static int
 795svcauth_null_release(struct svc_rqst *rqstp)
 796{
 797	if (rqstp->rq_client)
 798		auth_domain_put(rqstp->rq_client);
 799	rqstp->rq_client = NULL;
 800	if (rqstp->rq_cred.cr_group_info)
 801		put_group_info(rqstp->rq_cred.cr_group_info);
 802	rqstp->rq_cred.cr_group_info = NULL;
 803
 804	return 0; /* don't drop */
 805}
 806
 807
 808struct auth_ops svcauth_null = {
 809	.name		= "null",
 810	.owner		= THIS_MODULE,
 811	.flavour	= RPC_AUTH_NULL,
 812	.accept		= svcauth_null_accept,
 813	.release	= svcauth_null_release,
 814	.set_client	= svcauth_unix_set_client,
 815};
 816
 817
 818/**
 819 * svcauth_tls_accept - Decode and validate incoming RPC_AUTH_TLS credential
 820 * @rqstp: RPC transaction
 821 *
 822 * Return values:
 823 *   %SVC_OK: Both credential and verifier are valid
 824 *   %SVC_DENIED: Credential or verifier is not valid
 825 *   %SVC_GARBAGE: Failed to decode credential or verifier
 826 *   %SVC_CLOSE: Temporary failure
 827 *
 828 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
 829 */
 830static enum svc_auth_status
 831svcauth_tls_accept(struct svc_rqst *rqstp)
 832{
 833	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 834	struct svc_cred	*cred = &rqstp->rq_cred;
 835	struct svc_xprt *xprt = rqstp->rq_xprt;
 836	u32 flavor, len;
 837	void *body;
 838	__be32 *p;
 839
 840	/* Length of Call's credential body field: */
 841	if (xdr_stream_decode_u32(xdr, &len) < 0)
 842		return SVC_GARBAGE;
 843	if (len != 0) {
 844		rqstp->rq_auth_stat = rpc_autherr_badcred;
 845		return SVC_DENIED;
 846	}
 847
 848	/* Call's verf field: */
 849	if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
 850		return SVC_GARBAGE;
 851	if (flavor != RPC_AUTH_NULL || len != 0) {
 852		rqstp->rq_auth_stat = rpc_autherr_badverf;
 853		return SVC_DENIED;
 854	}
 855
 856	/* AUTH_TLS is not valid on non-NULL procedures */
 857	if (rqstp->rq_proc != 0) {
 858		rqstp->rq_auth_stat = rpc_autherr_badcred;
 859		return SVC_DENIED;
 860	}
 861
 862	/* Signal that mapping to nobody uid/gid is required */
 863	cred->cr_uid = INVALID_UID;
 864	cred->cr_gid = INVALID_GID;
 865	cred->cr_group_info = groups_alloc(0);
 866	if (cred->cr_group_info == NULL)
 867		return SVC_CLOSE;
 868
 869	if (xprt->xpt_ops->xpo_handshake) {
 870		p = xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2 + 8);
 871		if (!p)
 872			return SVC_CLOSE;
 873		trace_svc_tls_start(xprt);
 874		*p++ = rpc_auth_null;
 875		*p++ = cpu_to_be32(8);
 876		memcpy(p, "STARTTLS", 8);
 877
 878		set_bit(XPT_HANDSHAKE, &xprt->xpt_flags);
 879		svc_xprt_enqueue(xprt);
 880	} else {
 881		trace_svc_tls_unavailable(xprt);
 882		if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
 883						  RPC_AUTH_NULL, NULL, 0) < 0)
 884			return SVC_CLOSE;
 885	}
 886	if (!svcxdr_set_accept_stat(rqstp))
 887		return SVC_CLOSE;
 888
 889	rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
 890	return SVC_OK;
 891}
 892
 893struct auth_ops svcauth_tls = {
 894	.name		= "tls",
 895	.owner		= THIS_MODULE,
 896	.flavour	= RPC_AUTH_TLS,
 897	.accept		= svcauth_tls_accept,
 898	.release	= svcauth_null_release,
 899	.set_client	= svcauth_unix_set_client,
 900};
 901
 902
 903/**
 904 * svcauth_unix_accept - Decode and validate incoming RPC_AUTH_SYS credential
 905 * @rqstp: RPC transaction
 906 *
 907 * Return values:
 908 *   %SVC_OK: Both credential and verifier are valid
 909 *   %SVC_DENIED: Credential or verifier is not valid
 910 *   %SVC_GARBAGE: Failed to decode credential or verifier
 911 *   %SVC_CLOSE: Temporary failure
 912 *
 913 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
 914 */
 915static enum svc_auth_status
 916svcauth_unix_accept(struct svc_rqst *rqstp)
 917{
 918	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
 919	struct svc_cred	*cred = &rqstp->rq_cred;
 920	struct user_namespace *userns;
 921	u32 flavor, len, i;
 922	void *body;
 923	__be32 *p;
 924
 925	/*
 926	 * This implementation ignores the length of the Call's
 927	 * credential body field and the timestamp and machinename
 928	 * fields.
 929	 */
 930	p = xdr_inline_decode(xdr, XDR_UNIT * 3);
 931	if (!p)
 932		return SVC_GARBAGE;
 933	len = be32_to_cpup(p + 2);
 934	if (len > RPC_MAX_MACHINENAME)
 935		return SVC_GARBAGE;
 936	if (!xdr_inline_decode(xdr, len))
 937		return SVC_GARBAGE;
 938
 939	/*
 940	 * Note: we skip uid_valid()/gid_valid() checks here for
 941	 * backwards compatibility with clients that use -1 id's.
 942	 * Instead, -1 uid or gid is later mapped to the
 943	 * (export-specific) anonymous id by nfsd_setuser.
 944	 * Supplementary gid's will be left alone.
 945	 */
 946	userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
 947		rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
 948	if (xdr_stream_decode_u32(xdr, &i) < 0)
 949		return SVC_GARBAGE;
 950	cred->cr_uid = make_kuid(userns, i);
 951	if (xdr_stream_decode_u32(xdr, &i) < 0)
 952		return SVC_GARBAGE;
 953	cred->cr_gid = make_kgid(userns, i);
 954
 955	if (xdr_stream_decode_u32(xdr, &len) < 0)
 956		return SVC_GARBAGE;
 957	if (len > UNX_NGROUPS)
 958		goto badcred;
 959	p = xdr_inline_decode(xdr, XDR_UNIT * len);
 960	if (!p)
 961		return SVC_GARBAGE;
 962	cred->cr_group_info = groups_alloc(len);
 963	if (cred->cr_group_info == NULL)
 964		return SVC_CLOSE;
 965	for (i = 0; i < len; i++) {
 966		kgid_t kgid = make_kgid(userns, be32_to_cpup(p++));
 967		cred->cr_group_info->gid[i] = kgid;
 968	}
 969	groups_sort(cred->cr_group_info);
 970
 971	/* Call's verf field: */
 972	if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
 973		return SVC_GARBAGE;
 974	if (flavor != RPC_AUTH_NULL || len != 0) {
 975		rqstp->rq_auth_stat = rpc_autherr_badverf;
 976		return SVC_DENIED;
 977	}
 978
 979	if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
 980					  RPC_AUTH_NULL, NULL, 0) < 0)
 981		return SVC_CLOSE;
 982	if (!svcxdr_set_accept_stat(rqstp))
 983		return SVC_CLOSE;
 984
 985	rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
 986	return SVC_OK;
 987
 988badcred:
 989	rqstp->rq_auth_stat = rpc_autherr_badcred;
 990	return SVC_DENIED;
 991}
 992
 993static int
 994svcauth_unix_release(struct svc_rqst *rqstp)
 995{
 996	/* Verifier (such as it is) is already in place.
 997	 */
 998	if (rqstp->rq_client)
 999		auth_domain_put(rqstp->rq_client);
1000	rqstp->rq_client = NULL;
1001	if (rqstp->rq_cred.cr_group_info)
1002		put_group_info(rqstp->rq_cred.cr_group_info);
1003	rqstp->rq_cred.cr_group_info = NULL;
1004
1005	return 0;
1006}
1007
1008
1009struct auth_ops svcauth_unix = {
1010	.name		= "unix",
1011	.owner		= THIS_MODULE,
1012	.flavour	= RPC_AUTH_UNIX,
1013	.accept		= svcauth_unix_accept,
1014	.release	= svcauth_unix_release,
1015	.domain_release	= svcauth_unix_domain_release,
1016	.set_client	= svcauth_unix_set_client,
1017};
1018
1019static const struct cache_detail ip_map_cache_template = {
1020	.owner		= THIS_MODULE,
1021	.hash_size	= IP_HASHMAX,
1022	.name		= "auth.unix.ip",
1023	.cache_put	= ip_map_put,
1024	.cache_upcall	= ip_map_upcall,
1025	.cache_request	= ip_map_request,
1026	.cache_parse	= ip_map_parse,
1027	.cache_show	= ip_map_show,
1028	.match		= ip_map_match,
1029	.init		= ip_map_init,
1030	.update		= update,
1031	.alloc		= ip_map_alloc,
1032};
1033
1034int ip_map_cache_create(struct net *net)
1035{
1036	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1037	struct cache_detail *cd;
1038	int err;
1039
1040	cd = cache_create_net(&ip_map_cache_template, net);
1041	if (IS_ERR(cd))
1042		return PTR_ERR(cd);
1043	err = cache_register_net(cd, net);
1044	if (err) {
1045		cache_destroy_net(cd, net);
1046		return err;
1047	}
1048	sn->ip_map_cache = cd;
1049	return 0;
1050}
1051
1052void ip_map_cache_destroy(struct net *net)
1053{
1054	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1055	struct cache_detail *cd = sn->ip_map_cache;
1056
1057	sn->ip_map_cache = NULL;
1058	cache_purge(cd);
1059	cache_unregister_net(cd, net);
1060	cache_destroy_net(cd, net);
1061}