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 <net/genetlink.h>
21 #include <uapi/linux/sunrpc_netlink.h>
22 #include <trace/events/sunrpc.h>
23
24 #define RPCDBG_FACILITY RPCDBG_AUTH
25
26 #include "netns.h"
27 #include "netlink.h"
28
29 /*
30 * AUTHUNIX and AUTHNULL credentials are both handled here.
31 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
32 * are always nobody (-2). i.e. we do the same IP address checks for
33 * AUTHNULL as for AUTHUNIX, and that is done here.
34 */
35
36
37 struct unix_domain {
38 struct auth_domain h;
39 /* other stuff later */
40 };
41
42 extern struct auth_ops svcauth_null;
43 extern struct auth_ops svcauth_unix;
44 extern struct auth_ops svcauth_tls;
45
svcauth_unix_domain_release_rcu(struct rcu_head * head)46 static void svcauth_unix_domain_release_rcu(struct rcu_head *head)
47 {
48 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
49 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
50
51 kfree(dom->name);
52 kfree(ud);
53 }
54
svcauth_unix_domain_release(struct auth_domain * dom)55 static void svcauth_unix_domain_release(struct auth_domain *dom)
56 {
57 call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu);
58 }
59
unix_domain_find(char * name)60 struct auth_domain *unix_domain_find(char *name)
61 {
62 struct auth_domain *rv;
63 struct unix_domain *new = NULL;
64
65 rv = auth_domain_find(name);
66 while(1) {
67 if (rv) {
68 if (new && rv != &new->h)
69 svcauth_unix_domain_release(&new->h);
70
71 if (rv->flavour != &svcauth_unix) {
72 auth_domain_put(rv);
73 return NULL;
74 }
75 return rv;
76 }
77
78 new = kmalloc_obj(*new);
79 if (new == NULL)
80 return NULL;
81 kref_init(&new->h.ref);
82 new->h.name = kstrdup(name, GFP_KERNEL);
83 if (new->h.name == NULL) {
84 kfree(new);
85 return NULL;
86 }
87 new->h.flavour = &svcauth_unix;
88 rv = auth_domain_lookup(name, &new->h);
89 }
90 }
91 EXPORT_SYMBOL_GPL(unix_domain_find);
92
93
94 /**************************************************
95 * cache for IP address to unix_domain
96 * as needed by AUTH_UNIX
97 */
98 #define IP_HASHBITS 8
99 #define IP_HASHMAX (1<<IP_HASHBITS)
100
101 struct ip_map {
102 struct cache_head h;
103 char m_class[8]; /* e.g. "nfsd" */
104 struct in6_addr m_addr;
105 struct unix_domain *m_client;
106 struct rcu_head m_rcu;
107 };
108
ip_map_put(struct kref * kref)109 static void ip_map_put(struct kref *kref)
110 {
111 struct cache_head *item = container_of(kref, struct cache_head, ref);
112 struct ip_map *im = container_of(item, struct ip_map,h);
113
114 if (test_bit(CACHE_VALID, &item->flags) &&
115 !test_bit(CACHE_NEGATIVE, &item->flags))
116 auth_domain_put(&im->m_client->h);
117 kfree_rcu(im, m_rcu);
118 }
119
hash_ip6(const struct in6_addr * ip)120 static inline int hash_ip6(const struct in6_addr *ip)
121 {
122 return hash_32(ipv6_addr_hash(ip), IP_HASHBITS);
123 }
ip_map_match(struct cache_head * corig,struct cache_head * cnew)124 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
125 {
126 struct ip_map *orig = container_of(corig, struct ip_map, h);
127 struct ip_map *new = container_of(cnew, struct ip_map, h);
128 return strcmp(orig->m_class, new->m_class) == 0 &&
129 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
130 }
ip_map_init(struct cache_head * cnew,struct cache_head * citem)131 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
132 {
133 struct ip_map *new = container_of(cnew, struct ip_map, h);
134 struct ip_map *item = container_of(citem, struct ip_map, h);
135
136 strscpy(new->m_class, item->m_class);
137 new->m_addr = item->m_addr;
138 }
update(struct cache_head * cnew,struct cache_head * citem)139 static void update(struct cache_head *cnew, struct cache_head *citem)
140 {
141 struct ip_map *new = container_of(cnew, struct ip_map, h);
142 struct ip_map *item = container_of(citem, struct ip_map, h);
143
144 kref_get(&item->m_client->h.ref);
145 new->m_client = item->m_client;
146 }
ip_map_alloc(void)147 static struct cache_head *ip_map_alloc(void)
148 {
149 struct ip_map *i = kmalloc_obj(*i);
150 if (i)
151 return &i->h;
152 else
153 return NULL;
154 }
155
ip_map_upcall(struct cache_detail * cd,struct cache_head * h)156 static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
157 {
158 return sunrpc_cache_upcall(cd, h);
159 }
160
ip_map_request(struct cache_detail * cd,struct cache_head * h,char ** bpp,int * blen)161 static void ip_map_request(struct cache_detail *cd,
162 struct cache_head *h,
163 char **bpp, int *blen)
164 {
165 char text_addr[40];
166 struct ip_map *im = container_of(h, struct ip_map, h);
167
168 if (ipv6_addr_v4mapped(&(im->m_addr))) {
169 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
170 } else {
171 snprintf(text_addr, 40, "%pI6", &im->m_addr);
172 }
173 qword_add(bpp, blen, im->m_class);
174 qword_add(bpp, blen, text_addr);
175 (*bpp)[-1] = '\n';
176 }
177
178 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
179 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry);
180
ip_map_parse(struct cache_detail * cd,char * mesg,int mlen)181 static int ip_map_parse(struct cache_detail *cd,
182 char *mesg, int mlen)
183 {
184 /* class ipaddress [domainname] */
185 /* should be safe just to use the start of the input buffer
186 * for scratch: */
187 char *buf = mesg;
188 int len;
189 char class[8];
190 union {
191 struct sockaddr sa;
192 struct sockaddr_in s4;
193 struct sockaddr_in6 s6;
194 } address;
195 struct sockaddr_in6 sin6;
196 int err;
197
198 struct ip_map *ipmp;
199 struct auth_domain *dom;
200 time64_t expiry;
201
202 if (mesg[mlen-1] != '\n')
203 return -EINVAL;
204 mesg[mlen-1] = 0;
205
206 /* class */
207 len = qword_get(&mesg, class, sizeof(class));
208 if (len <= 0) return -EINVAL;
209
210 /* ip address */
211 len = qword_get(&mesg, buf, mlen);
212 if (len <= 0) return -EINVAL;
213
214 if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0)
215 return -EINVAL;
216 switch (address.sa.sa_family) {
217 case AF_INET:
218 /* Form a mapped IPv4 address in sin6 */
219 sin6.sin6_family = AF_INET6;
220 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
221 &sin6.sin6_addr);
222 break;
223 #if IS_ENABLED(CONFIG_IPV6)
224 case AF_INET6:
225 memcpy(&sin6, &address.s6, sizeof(sin6));
226 break;
227 #endif
228 default:
229 return -EINVAL;
230 }
231
232 err = get_expiry(&mesg, &expiry);
233 if (err)
234 return err;
235
236 /* domainname, or empty for NEGATIVE */
237 len = qword_get(&mesg, buf, mlen);
238 if (len < 0) return -EINVAL;
239
240 if (len) {
241 dom = unix_domain_find(buf);
242 if (dom == NULL)
243 return -ENOENT;
244 } else
245 dom = NULL;
246
247 /* IPv6 scope IDs are ignored for now */
248 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
249 if (ipmp) {
250 err = __ip_map_update(cd, ipmp,
251 container_of(dom, struct unix_domain, h),
252 expiry);
253 } else
254 err = -ENOMEM;
255
256 if (dom)
257 auth_domain_put(dom);
258
259 cache_flush();
260 return err;
261 }
262
ip_map_show(struct seq_file * m,struct cache_detail * cd,struct cache_head * h)263 static int ip_map_show(struct seq_file *m,
264 struct cache_detail *cd,
265 struct cache_head *h)
266 {
267 struct ip_map *im;
268 struct in6_addr addr;
269 char *dom = "-no-domain-";
270
271 if (h == NULL) {
272 seq_puts(m, "#class IP domain\n");
273 return 0;
274 }
275 im = container_of(h, struct ip_map, h);
276 /* class addr domain */
277 addr = im->m_addr;
278
279 if (test_bit(CACHE_VALID, &h->flags) &&
280 !test_bit(CACHE_NEGATIVE, &h->flags))
281 dom = im->m_client->h.name;
282
283 if (ipv6_addr_v4mapped(&addr)) {
284 seq_printf(m, "%s %pI4 %s\n",
285 im->m_class, &addr.s6_addr32[3], dom);
286 } else {
287 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
288 }
289 return 0;
290 }
291
292
__ip_map_lookup(struct cache_detail * cd,char * class,struct in6_addr * addr)293 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
294 struct in6_addr *addr)
295 {
296 struct ip_map ip;
297 struct cache_head *ch;
298
299 strscpy(ip.m_class, class);
300 ip.m_addr = *addr;
301 ch = sunrpc_cache_lookup_rcu(cd, &ip.h,
302 hash_str(class, IP_HASHBITS) ^
303 hash_ip6(addr));
304
305 if (ch)
306 return container_of(ch, struct ip_map, h);
307 else
308 return NULL;
309 }
310
__ip_map_update(struct cache_detail * cd,struct ip_map * ipm,struct unix_domain * udom,time64_t expiry)311 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
312 struct unix_domain *udom, time64_t expiry)
313 {
314 struct ip_map ip;
315 struct cache_head *ch;
316
317 ip.m_client = udom;
318 ip.h.flags = 0;
319 if (!udom)
320 set_bit(CACHE_NEGATIVE, &ip.h.flags);
321 ip.h.expiry_time = expiry;
322 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
323 hash_str(ipm->m_class, IP_HASHBITS) ^
324 hash_ip6(&ipm->m_addr));
325 if (!ch)
326 return -ENOMEM;
327 cache_put(ch, cd);
328 return 0;
329 }
330
svcauth_unix_purge(struct net * net)331 void svcauth_unix_purge(struct net *net)
332 {
333 struct sunrpc_net *sn;
334
335 sn = net_generic(net, sunrpc_net_id);
336 cache_purge(sn->ip_map_cache);
337 }
338 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
339
340 static inline struct ip_map *
ip_map_cached_get(struct svc_xprt * xprt)341 ip_map_cached_get(struct svc_xprt *xprt)
342 {
343 struct ip_map *ipm = NULL;
344 struct sunrpc_net *sn;
345
346 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
347 spin_lock(&xprt->xpt_lock);
348 ipm = xprt->xpt_auth_cache;
349 if (ipm != NULL) {
350 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
351 if (cache_is_expired(sn->ip_map_cache, &ipm->h)) {
352 /*
353 * The entry has been invalidated since it was
354 * remembered, e.g. by a second mount from the
355 * same IP address.
356 */
357 xprt->xpt_auth_cache = NULL;
358 spin_unlock(&xprt->xpt_lock);
359 cache_put(&ipm->h, sn->ip_map_cache);
360 return NULL;
361 }
362 cache_get(&ipm->h);
363 }
364 spin_unlock(&xprt->xpt_lock);
365 }
366 return ipm;
367 }
368
369 static inline void
ip_map_cached_put(struct svc_xprt * xprt,struct ip_map * ipm)370 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
371 {
372 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
373 spin_lock(&xprt->xpt_lock);
374 if (xprt->xpt_auth_cache == NULL) {
375 /* newly cached, keep the reference */
376 xprt->xpt_auth_cache = ipm;
377 ipm = NULL;
378 }
379 spin_unlock(&xprt->xpt_lock);
380 }
381 if (ipm) {
382 struct sunrpc_net *sn;
383
384 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
385 cache_put(&ipm->h, sn->ip_map_cache);
386 }
387 }
388
389 void
svcauth_unix_info_release(struct svc_xprt * xpt)390 svcauth_unix_info_release(struct svc_xprt *xpt)
391 {
392 struct ip_map *ipm;
393
394 ipm = xpt->xpt_auth_cache;
395 if (ipm != NULL) {
396 struct sunrpc_net *sn;
397
398 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
399 cache_put(&ipm->h, sn->ip_map_cache);
400 }
401 }
402
403 /****************************************************************************
404 * auth.unix.gid cache
405 * simple cache to map a UID to a list of GIDs
406 * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS
407 */
408 #define GID_HASHBITS 8
409 #define GID_HASHMAX (1<<GID_HASHBITS)
410
411 struct unix_gid {
412 struct cache_head h;
413 kuid_t uid;
414 struct group_info *gi;
415 struct rcu_head rcu;
416 };
417
unix_gid_hash(kuid_t uid)418 static int unix_gid_hash(kuid_t uid)
419 {
420 return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS);
421 }
422
unix_gid_free(struct rcu_head * rcu)423 static void unix_gid_free(struct rcu_head *rcu)
424 {
425 struct unix_gid *ug = container_of(rcu, struct unix_gid, rcu);
426 struct cache_head *item = &ug->h;
427
428 if (test_bit(CACHE_VALID, &item->flags) &&
429 !test_bit(CACHE_NEGATIVE, &item->flags))
430 put_group_info(ug->gi);
431 kfree(ug);
432 }
433
unix_gid_put(struct kref * kref)434 static void unix_gid_put(struct kref *kref)
435 {
436 struct cache_head *item = container_of(kref, struct cache_head, ref);
437 struct unix_gid *ug = container_of(item, struct unix_gid, h);
438
439 call_rcu(&ug->rcu, unix_gid_free);
440 }
441
unix_gid_match(struct cache_head * corig,struct cache_head * cnew)442 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
443 {
444 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
445 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
446 return uid_eq(orig->uid, new->uid);
447 }
unix_gid_init(struct cache_head * cnew,struct cache_head * citem)448 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
449 {
450 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
451 struct unix_gid *item = container_of(citem, struct unix_gid, h);
452 new->uid = item->uid;
453 }
unix_gid_update(struct cache_head * cnew,struct cache_head * citem)454 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
455 {
456 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
457 struct unix_gid *item = container_of(citem, struct unix_gid, h);
458
459 get_group_info(item->gi);
460 new->gi = item->gi;
461 }
unix_gid_alloc(void)462 static struct cache_head *unix_gid_alloc(void)
463 {
464 struct unix_gid *g = kmalloc_obj(*g);
465 if (g)
466 return &g->h;
467 else
468 return NULL;
469 }
470
unix_gid_upcall(struct cache_detail * cd,struct cache_head * h)471 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
472 {
473 return sunrpc_cache_upcall_warn(cd, h);
474 }
475
unix_gid_request(struct cache_detail * cd,struct cache_head * h,char ** bpp,int * blen)476 static void unix_gid_request(struct cache_detail *cd,
477 struct cache_head *h,
478 char **bpp, int *blen)
479 {
480 char tuid[20];
481 struct unix_gid *ug = container_of(h, struct unix_gid, h);
482
483 snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid));
484 qword_add(bpp, blen, tuid);
485 (*bpp)[-1] = '\n';
486 }
487
488 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid);
489
unix_gid_parse(struct cache_detail * cd,char * mesg,int mlen)490 static int unix_gid_parse(struct cache_detail *cd,
491 char *mesg, int mlen)
492 {
493 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
494 int id;
495 kuid_t uid;
496 int gids;
497 int rv;
498 int i;
499 int err;
500 time64_t expiry;
501 struct unix_gid ug, *ugp;
502
503 if (mesg[mlen - 1] != '\n')
504 return -EINVAL;
505 mesg[mlen-1] = 0;
506
507 rv = get_int(&mesg, &id);
508 if (rv)
509 return -EINVAL;
510 uid = make_kuid(current_user_ns(), id);
511 ug.uid = uid;
512
513 err = get_expiry(&mesg, &expiry);
514 if (err)
515 return err;
516
517 rv = get_int(&mesg, &gids);
518 if (rv || gids < 0 || gids > 8192)
519 return -EINVAL;
520
521 ug.gi = groups_alloc(gids);
522 if (!ug.gi)
523 return -ENOMEM;
524
525 for (i = 0 ; i < gids ; i++) {
526 int gid;
527 kgid_t kgid;
528 rv = get_int(&mesg, &gid);
529 err = -EINVAL;
530 if (rv)
531 goto out;
532 kgid = make_kgid(current_user_ns(), gid);
533 if (!gid_valid(kgid))
534 goto out;
535 ug.gi->gid[i] = kgid;
536 }
537
538 groups_sort(ug.gi);
539 ugp = unix_gid_lookup(cd, uid);
540 if (ugp) {
541 struct cache_head *ch;
542 ug.h.flags = 0;
543 ug.h.expiry_time = expiry;
544 ch = sunrpc_cache_update(cd,
545 &ug.h, &ugp->h,
546 unix_gid_hash(uid));
547 if (!ch)
548 err = -ENOMEM;
549 else {
550 err = 0;
551 cache_put(ch, cd);
552 }
553 } else
554 err = -ENOMEM;
555 out:
556 if (ug.gi)
557 put_group_info(ug.gi);
558 return err;
559 }
560
unix_gid_show(struct seq_file * m,struct cache_detail * cd,struct cache_head * h)561 static int unix_gid_show(struct seq_file *m,
562 struct cache_detail *cd,
563 struct cache_head *h)
564 {
565 struct user_namespace *user_ns = m->file->f_cred->user_ns;
566 struct unix_gid *ug;
567 int i;
568 int glen;
569
570 if (h == NULL) {
571 seq_puts(m, "#uid cnt: gids...\n");
572 return 0;
573 }
574 ug = container_of(h, struct unix_gid, h);
575 if (test_bit(CACHE_VALID, &h->flags) &&
576 !test_bit(CACHE_NEGATIVE, &h->flags))
577 glen = ug->gi->ngroups;
578 else
579 glen = 0;
580
581 seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen);
582 for (i = 0; i < glen; i++)
583 seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i]));
584 seq_printf(m, "\n");
585 return 0;
586 }
587
unix_gid_notify(struct cache_detail * cd,struct cache_head * h)588 static int unix_gid_notify(struct cache_detail *cd, struct cache_head *h)
589 {
590 return sunrpc_cache_notify(cd, h, SUNRPC_CACHE_TYPE_UNIX_GID);
591 }
592
593 /**
594 * sunrpc_nl_unix_gid_get_reqs_dumpit - dump pending unix_gid requests
595 * @skb: reply buffer
596 * @cb: netlink metadata and command arguments
597 *
598 * Walk the unix_gid cache's pending request list and create a netlink
599 * message with a nested entry for each cache_request, containing the
600 * seqno and uid.
601 *
602 * Uses cb->args[0] as a seqno cursor for dump continuation across
603 * multiple netlink messages.
604 *
605 * Returns the size of the reply or a negative errno.
606 */
sunrpc_nl_unix_gid_get_reqs_dumpit(struct sk_buff * skb,struct netlink_callback * cb)607 int sunrpc_nl_unix_gid_get_reqs_dumpit(struct sk_buff *skb,
608 struct netlink_callback *cb)
609 {
610 struct sunrpc_net *sn;
611 struct cache_detail *cd;
612 struct cache_head **items;
613 u64 *seqnos;
614 int cnt, i, emitted;
615 void *hdr;
616 int ret;
617
618 sn = net_generic(sock_net(skb->sk), sunrpc_net_id);
619
620 cd = sn->unix_gid_cache;
621 if (!cd)
622 return -ENODEV;
623
624 cnt = sunrpc_cache_requests_count(cd);
625 if (!cnt)
626 return 0;
627
628 items = kcalloc(cnt, sizeof(*items), GFP_KERNEL);
629 seqnos = kcalloc(cnt, sizeof(*seqnos), GFP_KERNEL);
630 if (!items || !seqnos) {
631 ret = -ENOMEM;
632 goto out_alloc;
633 }
634
635 cnt = sunrpc_cache_requests_snapshot(cd, items, seqnos, cnt,
636 cb->args[0]);
637 if (!cnt) {
638 ret = 0;
639 goto out_alloc;
640 }
641
642 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
643 cb->nlh->nlmsg_seq, &sunrpc_nl_family,
644 NLM_F_MULTI, SUNRPC_CMD_UNIX_GID_GET_REQS);
645 if (!hdr) {
646 ret = -ENOBUFS;
647 goto out_put;
648 }
649
650 emitted = 0;
651 for (i = 0; i < cnt; i++) {
652 struct unix_gid *ug;
653 struct nlattr *nest;
654
655 ug = container_of(items[i], struct unix_gid, h);
656
657 nest = nla_nest_start(skb,
658 SUNRPC_A_UNIX_GID_REQS_REQUESTS);
659 if (!nest)
660 break;
661
662 if (nla_put_u64_64bit(skb, SUNRPC_A_UNIX_GID_SEQNO,
663 seqnos[i], 0) ||
664 nla_put_u32(skb, SUNRPC_A_UNIX_GID_UID,
665 from_kuid(&init_user_ns, ug->uid))) {
666 nla_nest_cancel(skb, nest);
667 break;
668 }
669
670 nla_nest_end(skb, nest);
671 cb->args[0] = seqnos[i];
672 emitted++;
673 }
674
675 if (!emitted) {
676 genlmsg_cancel(skb, hdr);
677 ret = -EMSGSIZE;
678 goto out_put;
679 }
680
681 genlmsg_end(skb, hdr);
682 ret = skb->len;
683 out_put:
684 for (i = 0; i < cnt; i++)
685 cache_put(items[i], cd);
686 out_alloc:
687 kfree(seqnos);
688 kfree(items);
689 return ret;
690 }
691
692 /**
693 * sunrpc_nl_parse_one_unix_gid - parse one unix_gid entry from netlink
694 * @cd: cache_detail for the unix_gid cache
695 * @attr: nested attribute containing unix_gid fields
696 *
697 * Parses one unix_gid entry from a netlink message and updates the
698 * cache. Mirrors the logic in unix_gid_parse().
699 *
700 * Returns 0 on success or a negative errno.
701 */
sunrpc_nl_parse_one_unix_gid(struct cache_detail * cd,struct nlattr * attr)702 static int sunrpc_nl_parse_one_unix_gid(struct cache_detail *cd,
703 struct nlattr *attr)
704 {
705 struct nlattr *tb[SUNRPC_A_UNIX_GID_EXPIRY + 1];
706 struct unix_gid ug, *ugp;
707 struct timespec64 boot;
708 struct nlattr *gid_attr;
709 int err, rem, gids = 0;
710 kuid_t uid;
711
712 err = nla_parse_nested(tb, SUNRPC_A_UNIX_GID_EXPIRY, attr,
713 sunrpc_unix_gid_nl_policy, NULL);
714 if (err)
715 return err;
716
717 /* uid (required) */
718 if (!tb[SUNRPC_A_UNIX_GID_UID])
719 return -EINVAL;
720 uid = make_kuid(current_user_ns(),
721 nla_get_u32(tb[SUNRPC_A_UNIX_GID_UID]));
722 ug.uid = uid;
723
724 /* expiry (required, wallclock seconds) */
725 if (!tb[SUNRPC_A_UNIX_GID_EXPIRY])
726 return -EINVAL;
727 getboottime64(&boot);
728 ug.h.flags = 0;
729 ug.h.expiry_time = nla_get_u64(tb[SUNRPC_A_UNIX_GID_EXPIRY]) -
730 boot.tv_sec;
731
732 if (tb[SUNRPC_A_UNIX_GID_NEGATIVE]) {
733 ug.gi = groups_alloc(0);
734 if (!ug.gi)
735 return -ENOMEM;
736 } else {
737 /* Count gids */
738 nla_for_each_nested_type(gid_attr, SUNRPC_A_UNIX_GID_GIDS,
739 attr, rem)
740 gids++;
741
742 if (gids > 8192)
743 return -EINVAL;
744
745 ug.gi = groups_alloc(gids);
746 if (!ug.gi)
747 return -ENOMEM;
748
749 gids = 0;
750 nla_for_each_nested_type(gid_attr, SUNRPC_A_UNIX_GID_GIDS,
751 attr, rem) {
752 kgid_t kgid;
753
754 kgid = make_kgid(current_user_ns(),
755 nla_get_u32(gid_attr));
756 if (!gid_valid(kgid)) {
757 err = -EINVAL;
758 goto out;
759 }
760 ug.gi->gid[gids++] = kgid;
761 }
762 groups_sort(ug.gi);
763 }
764
765 ugp = unix_gid_lookup(cd, uid);
766 if (ugp) {
767 struct cache_head *ch;
768
769 ch = sunrpc_cache_update(cd, &ug.h, &ugp->h,
770 unix_gid_hash(uid));
771 if (!ch) {
772 err = -ENOMEM;
773 } else {
774 err = 0;
775 cache_put(ch, cd);
776 }
777 } else {
778 err = -ENOMEM;
779 }
780 out:
781 if (ug.gi)
782 put_group_info(ug.gi);
783 return err;
784 }
785
786 /**
787 * sunrpc_nl_unix_gid_set_reqs_doit - respond to unix_gid requests
788 * @skb: reply buffer
789 * @info: netlink metadata and command arguments
790 *
791 * Parse one or more unix_gid cache responses from userspace and
792 * update the unix_gid cache accordingly.
793 *
794 * Returns 0 on success or a negative errno.
795 */
sunrpc_nl_unix_gid_set_reqs_doit(struct sk_buff * skb,struct genl_info * info)796 int sunrpc_nl_unix_gid_set_reqs_doit(struct sk_buff *skb,
797 struct genl_info *info)
798 {
799 struct sunrpc_net *sn;
800 struct cache_detail *cd;
801 const struct nlattr *attr;
802 int rem, ret = 0;
803
804 sn = net_generic(genl_info_net(info), sunrpc_net_id);
805
806 cd = sn->unix_gid_cache;
807 if (!cd)
808 return -ENODEV;
809
810 nlmsg_for_each_attr_type(attr, SUNRPC_A_UNIX_GID_REQS_REQUESTS,
811 info->nlhdr, GENL_HDRLEN, rem) {
812 ret = sunrpc_nl_parse_one_unix_gid(cd,
813 (struct nlattr *)attr);
814 if (ret)
815 break;
816 }
817
818 return ret;
819 }
820
821 /**
822 * sunrpc_nl_cache_flush_doit - flush sunrpc caches via netlink
823 * @skb: reply buffer
824 * @info: netlink metadata and command arguments
825 *
826 * Flush the ip_map and/or unix_gid caches. If SUNRPC_A_CACHE_FLUSH_MASK
827 * is provided, only flush the caches indicated by the bitmask (bit 1 =
828 * ip_map, bit 2 = unix_gid). If omitted, flush both.
829 *
830 * Return 0 on success or a negative errno.
831 */
sunrpc_nl_cache_flush_doit(struct sk_buff * skb,struct genl_info * info)832 int sunrpc_nl_cache_flush_doit(struct sk_buff *skb, struct genl_info *info)
833 {
834 struct sunrpc_net *sn;
835 u32 mask = ~0U;
836
837 sn = net_generic(genl_info_net(info), sunrpc_net_id);
838
839 if (info->attrs[SUNRPC_A_CACHE_FLUSH_MASK])
840 mask = nla_get_u32(info->attrs[SUNRPC_A_CACHE_FLUSH_MASK]);
841
842 if ((mask & SUNRPC_CACHE_TYPE_IP_MAP) &&
843 sn->ip_map_cache)
844 cache_purge(sn->ip_map_cache);
845
846 if ((mask & SUNRPC_CACHE_TYPE_UNIX_GID) &&
847 sn->unix_gid_cache)
848 cache_purge(sn->unix_gid_cache);
849
850 return 0;
851 }
852
853 static const struct cache_detail unix_gid_cache_template = {
854 .owner = THIS_MODULE,
855 .hash_size = GID_HASHMAX,
856 .name = "auth.unix.gid",
857 .cache_put = unix_gid_put,
858 .cache_upcall = unix_gid_upcall,
859 .cache_notify = unix_gid_notify,
860 .cache_request = unix_gid_request,
861 .cache_parse = unix_gid_parse,
862 .cache_show = unix_gid_show,
863 .match = unix_gid_match,
864 .init = unix_gid_init,
865 .update = unix_gid_update,
866 .alloc = unix_gid_alloc,
867 };
868
unix_gid_cache_create(struct net * net)869 int unix_gid_cache_create(struct net *net)
870 {
871 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
872 struct cache_detail *cd;
873 int err;
874
875 cd = cache_create_net(&unix_gid_cache_template, net);
876 if (IS_ERR(cd))
877 return PTR_ERR(cd);
878 err = cache_register_net(cd, net);
879 if (err) {
880 cache_destroy_net(cd, net);
881 return err;
882 }
883 sn->unix_gid_cache = cd;
884 return 0;
885 }
886
unix_gid_cache_destroy(struct net * net)887 void unix_gid_cache_destroy(struct net *net)
888 {
889 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
890 struct cache_detail *cd = sn->unix_gid_cache;
891
892 sn->unix_gid_cache = NULL;
893 cache_purge(cd);
894 cache_unregister_net(cd, net);
895 cache_destroy_net(cd, net);
896 }
897
unix_gid_lookup(struct cache_detail * cd,kuid_t uid)898 static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid)
899 {
900 struct unix_gid ug;
901 struct cache_head *ch;
902
903 ug.uid = uid;
904 ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid));
905 if (ch)
906 return container_of(ch, struct unix_gid, h);
907 else
908 return NULL;
909 }
910
unix_gid_find(kuid_t uid,struct svc_rqst * rqstp)911 static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp)
912 {
913 struct unix_gid *ug;
914 struct group_info *gi;
915 int ret;
916 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net,
917 sunrpc_net_id);
918
919 ug = unix_gid_lookup(sn->unix_gid_cache, uid);
920 if (!ug)
921 return ERR_PTR(-EAGAIN);
922 ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle);
923 switch (ret) {
924 case -ENOENT:
925 return ERR_PTR(-ENOENT);
926 case -ETIMEDOUT:
927 return ERR_PTR(-ESHUTDOWN);
928 case 0:
929 gi = get_group_info(ug->gi);
930 cache_put(&ug->h, sn->unix_gid_cache);
931 return gi;
932 default:
933 return ERR_PTR(-EAGAIN);
934 }
935 }
936
937 enum svc_auth_status
svcauth_unix_set_client(struct svc_rqst * rqstp)938 svcauth_unix_set_client(struct svc_rqst *rqstp)
939 {
940 struct sockaddr_in *sin;
941 struct sockaddr_in6 *sin6, sin6_storage;
942 struct ip_map *ipm;
943 struct group_info *gi;
944 struct svc_cred *cred = &rqstp->rq_cred;
945 struct svc_xprt *xprt = rqstp->rq_xprt;
946 struct net *net = xprt->xpt_net;
947 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
948
949 switch (rqstp->rq_addr.ss_family) {
950 case AF_INET:
951 sin = svc_addr_in(rqstp);
952 sin6 = &sin6_storage;
953 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
954 break;
955 case AF_INET6:
956 sin6 = svc_addr_in6(rqstp);
957 break;
958 default:
959 BUG();
960 }
961
962 rqstp->rq_client = NULL;
963 if (rqstp->rq_proc == 0)
964 goto out;
965
966 rqstp->rq_auth_stat = rpc_autherr_badcred;
967 ipm = ip_map_cached_get(xprt);
968 if (ipm == NULL)
969 ipm = __ip_map_lookup(sn->ip_map_cache,
970 rqstp->rq_server->sv_programs->pg_class,
971 &sin6->sin6_addr);
972
973 if (ipm == NULL)
974 return SVC_DENIED;
975
976 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
977 default:
978 BUG();
979 case -ETIMEDOUT:
980 return SVC_CLOSE;
981 case -EAGAIN:
982 return SVC_DROP;
983 case -ENOENT:
984 return SVC_DENIED;
985 case 0:
986 rqstp->rq_client = &ipm->m_client->h;
987 kref_get(&rqstp->rq_client->ref);
988 ip_map_cached_put(xprt, ipm);
989 break;
990 }
991
992 gi = unix_gid_find(cred->cr_uid, rqstp);
993 switch (PTR_ERR(gi)) {
994 case -EAGAIN:
995 return SVC_DROP;
996 case -ESHUTDOWN:
997 return SVC_CLOSE;
998 case -ENOENT:
999 break;
1000 default:
1001 put_group_info(cred->cr_group_info);
1002 cred->cr_group_info = gi;
1003 }
1004
1005 out:
1006 rqstp->rq_auth_stat = rpc_auth_ok;
1007 return SVC_OK;
1008 }
1009 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
1010
1011 /**
1012 * svcauth_null_accept - Decode and validate incoming RPC_AUTH_NULL credential
1013 * @rqstp: RPC transaction
1014 *
1015 * Return values:
1016 * %SVC_OK: Both credential and verifier are valid
1017 * %SVC_DENIED: Credential or verifier is not valid
1018 * %SVC_GARBAGE: Failed to decode credential or verifier
1019 * %SVC_CLOSE: Temporary failure
1020 *
1021 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
1022 */
1023 static enum svc_auth_status
svcauth_null_accept(struct svc_rqst * rqstp)1024 svcauth_null_accept(struct svc_rqst *rqstp)
1025 {
1026 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1027 struct svc_cred *cred = &rqstp->rq_cred;
1028 u32 flavor, len;
1029 void *body;
1030
1031 /* Length of Call's credential body field: */
1032 if (xdr_stream_decode_u32(xdr, &len) < 0)
1033 return SVC_GARBAGE;
1034 if (len != 0) {
1035 rqstp->rq_auth_stat = rpc_autherr_badcred;
1036 return SVC_DENIED;
1037 }
1038
1039 /* Call's verf field: */
1040 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
1041 return SVC_GARBAGE;
1042 if (flavor != RPC_AUTH_NULL || len != 0) {
1043 rqstp->rq_auth_stat = rpc_autherr_badverf;
1044 return SVC_DENIED;
1045 }
1046
1047 /* Signal that mapping to nobody uid/gid is required */
1048 cred->cr_uid = INVALID_UID;
1049 cred->cr_gid = INVALID_GID;
1050 cred->cr_group_info = groups_alloc(0);
1051 if (cred->cr_group_info == NULL)
1052 return SVC_CLOSE; /* kmalloc failure - client must retry */
1053
1054 if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
1055 RPC_AUTH_NULL, NULL, 0) < 0)
1056 return SVC_CLOSE;
1057 if (!svcxdr_set_accept_stat(rqstp))
1058 return SVC_CLOSE;
1059
1060 rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL;
1061 return SVC_OK;
1062 }
1063
1064 static int
svcauth_null_release(struct svc_rqst * rqstp)1065 svcauth_null_release(struct svc_rqst *rqstp)
1066 {
1067 if (rqstp->rq_client)
1068 auth_domain_put(rqstp->rq_client);
1069 rqstp->rq_client = NULL;
1070 if (rqstp->rq_cred.cr_group_info)
1071 put_group_info(rqstp->rq_cred.cr_group_info);
1072 rqstp->rq_cred.cr_group_info = NULL;
1073
1074 return 0; /* don't drop */
1075 }
1076
1077
1078 struct auth_ops svcauth_null = {
1079 .name = "null",
1080 .owner = THIS_MODULE,
1081 .flavour = RPC_AUTH_NULL,
1082 .accept = svcauth_null_accept,
1083 .release = svcauth_null_release,
1084 .set_client = svcauth_unix_set_client,
1085 };
1086
1087
1088 /**
1089 * svcauth_tls_accept - Decode and validate incoming RPC_AUTH_TLS credential
1090 * @rqstp: RPC transaction
1091 *
1092 * Return values:
1093 * %SVC_OK: Both credential and verifier are valid
1094 * %SVC_DENIED: Credential or verifier is not valid
1095 * %SVC_GARBAGE: Failed to decode credential or verifier
1096 * %SVC_CLOSE: Temporary failure
1097 *
1098 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
1099 */
1100 static enum svc_auth_status
svcauth_tls_accept(struct svc_rqst * rqstp)1101 svcauth_tls_accept(struct svc_rqst *rqstp)
1102 {
1103 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1104 struct svc_cred *cred = &rqstp->rq_cred;
1105 struct svc_xprt *xprt = rqstp->rq_xprt;
1106 u32 flavor, len;
1107 void *body;
1108 __be32 *p;
1109
1110 /* Length of Call's credential body field: */
1111 if (xdr_stream_decode_u32(xdr, &len) < 0)
1112 return SVC_GARBAGE;
1113 if (len != 0) {
1114 rqstp->rq_auth_stat = rpc_autherr_badcred;
1115 return SVC_DENIED;
1116 }
1117
1118 /* Call's verf field: */
1119 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
1120 return SVC_GARBAGE;
1121 if (flavor != RPC_AUTH_NULL || len != 0) {
1122 rqstp->rq_auth_stat = rpc_autherr_badverf;
1123 return SVC_DENIED;
1124 }
1125
1126 /* AUTH_TLS is not valid on non-NULL procedures */
1127 if (rqstp->rq_proc != 0) {
1128 rqstp->rq_auth_stat = rpc_autherr_badcred;
1129 return SVC_DENIED;
1130 }
1131
1132 /* Signal that mapping to nobody uid/gid is required */
1133 cred->cr_uid = INVALID_UID;
1134 cred->cr_gid = INVALID_GID;
1135 cred->cr_group_info = groups_alloc(0);
1136 if (cred->cr_group_info == NULL)
1137 return SVC_CLOSE;
1138
1139 if (xprt->xpt_ops->xpo_handshake) {
1140 p = xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2 + 8);
1141 if (!p)
1142 return SVC_CLOSE;
1143 trace_svc_tls_start(xprt);
1144 *p++ = rpc_auth_null;
1145 *p++ = cpu_to_be32(8);
1146 memcpy(p, "STARTTLS", 8);
1147
1148 set_bit(XPT_HANDSHAKE, &xprt->xpt_flags);
1149 svc_xprt_enqueue(xprt);
1150 } else {
1151 trace_svc_tls_unavailable(xprt);
1152 if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
1153 RPC_AUTH_NULL, NULL, 0) < 0)
1154 return SVC_CLOSE;
1155 }
1156 if (!svcxdr_set_accept_stat(rqstp))
1157 return SVC_CLOSE;
1158
1159 rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
1160 return SVC_OK;
1161 }
1162
1163 struct auth_ops svcauth_tls = {
1164 .name = "tls",
1165 .owner = THIS_MODULE,
1166 .flavour = RPC_AUTH_TLS,
1167 .accept = svcauth_tls_accept,
1168 .release = svcauth_null_release,
1169 .set_client = svcauth_unix_set_client,
1170 };
1171
1172
1173 /**
1174 * svcauth_unix_accept - Decode and validate incoming RPC_AUTH_SYS credential
1175 * @rqstp: RPC transaction
1176 *
1177 * Return values:
1178 * %SVC_OK: Both credential and verifier are valid
1179 * %SVC_DENIED: Credential or verifier is not valid
1180 * %SVC_GARBAGE: Failed to decode credential or verifier
1181 * %SVC_CLOSE: Temporary failure
1182 *
1183 * rqstp->rq_auth_stat is set as mandated by RFC 5531.
1184 */
1185 static enum svc_auth_status
svcauth_unix_accept(struct svc_rqst * rqstp)1186 svcauth_unix_accept(struct svc_rqst *rqstp)
1187 {
1188 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1189 struct svc_cred *cred = &rqstp->rq_cred;
1190 struct user_namespace *userns;
1191 u32 flavor, len, i;
1192 void *body;
1193 __be32 *p;
1194
1195 /*
1196 * This implementation ignores the length of the Call's
1197 * credential body field and the timestamp and machinename
1198 * fields.
1199 */
1200 p = xdr_inline_decode(xdr, XDR_UNIT * 3);
1201 if (!p)
1202 return SVC_GARBAGE;
1203 len = be32_to_cpup(p + 2);
1204 if (len > RPC_MAX_MACHINENAME)
1205 return SVC_GARBAGE;
1206 if (!xdr_inline_decode(xdr, len))
1207 return SVC_GARBAGE;
1208
1209 /*
1210 * Note: we skip uid_valid()/gid_valid() checks here for
1211 * backwards compatibility with clients that use -1 id's.
1212 * Instead, -1 uid or gid is later mapped to the
1213 * (export-specific) anonymous id by nfsd_setuser.
1214 * Supplementary gid's will be left alone.
1215 */
1216 userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
1217 rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
1218 if (xdr_stream_decode_u32(xdr, &i) < 0)
1219 return SVC_GARBAGE;
1220 cred->cr_uid = make_kuid(userns, i);
1221 if (xdr_stream_decode_u32(xdr, &i) < 0)
1222 return SVC_GARBAGE;
1223 cred->cr_gid = make_kgid(userns, i);
1224
1225 if (xdr_stream_decode_u32(xdr, &len) < 0)
1226 return SVC_GARBAGE;
1227 if (len > UNX_NGROUPS)
1228 goto badcred;
1229 p = xdr_inline_decode(xdr, XDR_UNIT * len);
1230 if (!p)
1231 return SVC_GARBAGE;
1232 cred->cr_group_info = groups_alloc(len);
1233 if (cred->cr_group_info == NULL)
1234 return SVC_CLOSE;
1235 for (i = 0; i < len; i++) {
1236 kgid_t kgid = make_kgid(userns, be32_to_cpup(p++));
1237 cred->cr_group_info->gid[i] = kgid;
1238 }
1239 groups_sort(cred->cr_group_info);
1240
1241 /* Call's verf field: */
1242 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
1243 return SVC_GARBAGE;
1244 if (flavor != RPC_AUTH_NULL || len != 0) {
1245 rqstp->rq_auth_stat = rpc_autherr_badverf;
1246 return SVC_DENIED;
1247 }
1248
1249 if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
1250 RPC_AUTH_NULL, NULL, 0) < 0)
1251 return SVC_CLOSE;
1252 if (!svcxdr_set_accept_stat(rqstp))
1253 return SVC_CLOSE;
1254
1255 rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX;
1256 return SVC_OK;
1257
1258 badcred:
1259 rqstp->rq_auth_stat = rpc_autherr_badcred;
1260 return SVC_DENIED;
1261 }
1262
1263 static int
svcauth_unix_release(struct svc_rqst * rqstp)1264 svcauth_unix_release(struct svc_rqst *rqstp)
1265 {
1266 /* Verifier (such as it is) is already in place.
1267 */
1268 if (rqstp->rq_client)
1269 auth_domain_put(rqstp->rq_client);
1270 rqstp->rq_client = NULL;
1271 if (rqstp->rq_cred.cr_group_info)
1272 put_group_info(rqstp->rq_cred.cr_group_info);
1273 rqstp->rq_cred.cr_group_info = NULL;
1274
1275 return 0;
1276 }
1277
1278
1279 struct auth_ops svcauth_unix = {
1280 .name = "unix",
1281 .owner = THIS_MODULE,
1282 .flavour = RPC_AUTH_UNIX,
1283 .accept = svcauth_unix_accept,
1284 .release = svcauth_unix_release,
1285 .domain_release = svcauth_unix_domain_release,
1286 .set_client = svcauth_unix_set_client,
1287 };
1288
ip_map_notify(struct cache_detail * cd,struct cache_head * h)1289 static int ip_map_notify(struct cache_detail *cd, struct cache_head *h)
1290 {
1291 return sunrpc_cache_notify(cd, h, SUNRPC_CACHE_TYPE_IP_MAP);
1292 }
1293
1294 /**
1295 * sunrpc_nl_ip_map_get_reqs_dumpit - dump pending ip_map requests
1296 * @skb: reply buffer
1297 * @cb: netlink metadata and command arguments
1298 *
1299 * Walk the ip_map cache's pending request list and create a netlink
1300 * message with a nested entry for each cache_request, containing the
1301 * seqno, class and addr.
1302 *
1303 * Uses cb->args[0] as a seqno cursor for dump continuation across
1304 * multiple netlink messages.
1305 *
1306 * Returns the size of the reply or a negative errno.
1307 */
sunrpc_nl_ip_map_get_reqs_dumpit(struct sk_buff * skb,struct netlink_callback * cb)1308 int sunrpc_nl_ip_map_get_reqs_dumpit(struct sk_buff *skb,
1309 struct netlink_callback *cb)
1310 {
1311 struct sunrpc_net *sn;
1312 struct cache_detail *cd;
1313 struct cache_head **items;
1314 u64 *seqnos;
1315 int cnt, i, emitted;
1316 void *hdr;
1317 int ret;
1318
1319 sn = net_generic(sock_net(skb->sk), sunrpc_net_id);
1320
1321 cd = sn->ip_map_cache;
1322 if (!cd)
1323 return -ENODEV;
1324
1325 cnt = sunrpc_cache_requests_count(cd);
1326 if (!cnt)
1327 return 0;
1328
1329 items = kcalloc(cnt, sizeof(*items), GFP_KERNEL);
1330 seqnos = kcalloc(cnt, sizeof(*seqnos), GFP_KERNEL);
1331 if (!items || !seqnos) {
1332 ret = -ENOMEM;
1333 goto out_alloc;
1334 }
1335
1336 cnt = sunrpc_cache_requests_snapshot(cd, items, seqnos, cnt,
1337 cb->args[0]);
1338 if (!cnt) {
1339 ret = 0;
1340 goto out_alloc;
1341 }
1342
1343 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
1344 cb->nlh->nlmsg_seq, &sunrpc_nl_family,
1345 NLM_F_MULTI, SUNRPC_CMD_IP_MAP_GET_REQS);
1346 if (!hdr) {
1347 ret = -ENOBUFS;
1348 goto out_put;
1349 }
1350
1351 emitted = 0;
1352 for (i = 0; i < cnt; i++) {
1353 struct ip_map *im;
1354 struct nlattr *nest;
1355 char text_addr[40];
1356
1357 im = container_of(items[i], struct ip_map, h);
1358
1359 if (ipv6_addr_v4mapped(&im->m_addr))
1360 snprintf(text_addr, 20, "%pI4",
1361 &im->m_addr.s6_addr32[3]);
1362 else
1363 snprintf(text_addr, 40, "%pI6", &im->m_addr);
1364
1365 nest = nla_nest_start(skb, SUNRPC_A_IP_MAP_REQS_REQUESTS);
1366 if (!nest)
1367 break;
1368
1369 if (nla_put_u64_64bit(skb, SUNRPC_A_IP_MAP_SEQNO,
1370 seqnos[i], 0) ||
1371 nla_put_string(skb, SUNRPC_A_IP_MAP_CLASS,
1372 im->m_class) ||
1373 nla_put_string(skb, SUNRPC_A_IP_MAP_ADDR, text_addr)) {
1374 nla_nest_cancel(skb, nest);
1375 break;
1376 }
1377
1378 nla_nest_end(skb, nest);
1379 cb->args[0] = seqnos[i];
1380 emitted++;
1381 }
1382
1383 if (!emitted) {
1384 genlmsg_cancel(skb, hdr);
1385 ret = -EMSGSIZE;
1386 goto out_put;
1387 }
1388
1389 genlmsg_end(skb, hdr);
1390 ret = skb->len;
1391 out_put:
1392 for (i = 0; i < cnt; i++)
1393 cache_put(items[i], cd);
1394 out_alloc:
1395 kfree(seqnos);
1396 kfree(items);
1397 return ret;
1398 }
1399
1400 /**
1401 * sunrpc_nl_parse_one_ip_map - parse one ip_map entry from netlink
1402 * @cd: cache_detail for the ip_map cache
1403 * @attr: nested attribute containing ip_map fields
1404 *
1405 * Parses one ip_map entry from a netlink message and updates the
1406 * cache. Mirrors the logic in ip_map_parse().
1407 *
1408 * Returns 0 on success or a negative errno.
1409 */
sunrpc_nl_parse_one_ip_map(struct cache_detail * cd,struct nlattr * attr)1410 static int sunrpc_nl_parse_one_ip_map(struct cache_detail *cd,
1411 struct nlattr *attr)
1412 {
1413 struct nlattr *tb[SUNRPC_A_IP_MAP_EXPIRY + 1];
1414 union {
1415 struct sockaddr sa;
1416 struct sockaddr_in s4;
1417 struct sockaddr_in6 s6;
1418 } address;
1419 struct sockaddr_in6 sin6;
1420 struct ip_map *ipmp;
1421 struct auth_domain *dom = NULL;
1422 struct unix_domain *udom = NULL;
1423 struct timespec64 boot;
1424 time64_t expiry;
1425 char class[8];
1426 int err;
1427 int len;
1428
1429 err = nla_parse_nested(tb, SUNRPC_A_IP_MAP_EXPIRY, attr,
1430 sunrpc_ip_map_nl_policy, NULL);
1431 if (err)
1432 return err;
1433
1434 /* class (required) */
1435 if (!tb[SUNRPC_A_IP_MAP_CLASS])
1436 return -EINVAL;
1437 len = nla_len(tb[SUNRPC_A_IP_MAP_CLASS]);
1438 if (len <= 0 || len > sizeof(class))
1439 return -EINVAL;
1440 nla_strscpy(class, tb[SUNRPC_A_IP_MAP_CLASS], sizeof(class));
1441
1442 /* addr (required) */
1443 if (!tb[SUNRPC_A_IP_MAP_ADDR])
1444 return -EINVAL;
1445 if (rpc_pton(cd->net, nla_data(tb[SUNRPC_A_IP_MAP_ADDR]),
1446 nla_len(tb[SUNRPC_A_IP_MAP_ADDR]) - 1,
1447 &address.sa, sizeof(address)) == 0)
1448 return -EINVAL;
1449
1450 switch (address.sa.sa_family) {
1451 case AF_INET:
1452 sin6.sin6_family = AF_INET6;
1453 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
1454 &sin6.sin6_addr);
1455 break;
1456 #if IS_ENABLED(CONFIG_IPV6)
1457 case AF_INET6:
1458 memcpy(&sin6, &address.s6, sizeof(sin6));
1459 break;
1460 #endif
1461 default:
1462 return -EINVAL;
1463 }
1464
1465 /* expiry (required, wallclock seconds) */
1466 if (!tb[SUNRPC_A_IP_MAP_EXPIRY])
1467 return -EINVAL;
1468 getboottime64(&boot);
1469 expiry = nla_get_u64(tb[SUNRPC_A_IP_MAP_EXPIRY]) - boot.tv_sec;
1470
1471 /* domain name or negative */
1472 if (tb[SUNRPC_A_IP_MAP_NEGATIVE]) {
1473 udom = NULL;
1474 } else if (tb[SUNRPC_A_IP_MAP_DOMAIN]) {
1475 dom = unix_domain_find(nla_data(tb[SUNRPC_A_IP_MAP_DOMAIN]));
1476 if (!dom)
1477 return -ENOENT;
1478 udom = container_of(dom, struct unix_domain, h);
1479 } else {
1480 return -EINVAL;
1481 }
1482
1483 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
1484 if (ipmp)
1485 err = __ip_map_update(cd, ipmp, udom, expiry);
1486 else
1487 err = -ENOMEM;
1488
1489 if (dom)
1490 auth_domain_put(dom);
1491
1492 cache_flush();
1493 return err;
1494 }
1495
1496 /**
1497 * sunrpc_nl_ip_map_set_reqs_doit - respond to ip_map requests
1498 * @skb: reply buffer
1499 * @info: netlink metadata and command arguments
1500 *
1501 * Parse one or more ip_map cache responses from userspace and
1502 * update the ip_map cache accordingly.
1503 *
1504 * Returns 0 on success or a negative errno.
1505 */
sunrpc_nl_ip_map_set_reqs_doit(struct sk_buff * skb,struct genl_info * info)1506 int sunrpc_nl_ip_map_set_reqs_doit(struct sk_buff *skb,
1507 struct genl_info *info)
1508 {
1509 struct sunrpc_net *sn;
1510 struct cache_detail *cd;
1511 const struct nlattr *attr;
1512 int rem, ret = 0;
1513
1514 sn = net_generic(genl_info_net(info), sunrpc_net_id);
1515
1516 cd = sn->ip_map_cache;
1517 if (!cd)
1518 return -ENODEV;
1519
1520 nlmsg_for_each_attr_type(attr, SUNRPC_A_IP_MAP_REQS_REQUESTS,
1521 info->nlhdr, GENL_HDRLEN, rem) {
1522 ret = sunrpc_nl_parse_one_ip_map(cd,
1523 (struct nlattr *)attr);
1524 if (ret)
1525 break;
1526 }
1527
1528 return ret;
1529 }
1530
1531 static const struct cache_detail ip_map_cache_template = {
1532 .owner = THIS_MODULE,
1533 .hash_size = IP_HASHMAX,
1534 .name = "auth.unix.ip",
1535 .cache_put = ip_map_put,
1536 .cache_upcall = ip_map_upcall,
1537 .cache_notify = ip_map_notify,
1538 .cache_request = ip_map_request,
1539 .cache_parse = ip_map_parse,
1540 .cache_show = ip_map_show,
1541 .match = ip_map_match,
1542 .init = ip_map_init,
1543 .update = update,
1544 .alloc = ip_map_alloc,
1545 };
1546
ip_map_cache_create(struct net * net)1547 int ip_map_cache_create(struct net *net)
1548 {
1549 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1550 struct cache_detail *cd;
1551 int err;
1552
1553 cd = cache_create_net(&ip_map_cache_template, net);
1554 if (IS_ERR(cd))
1555 return PTR_ERR(cd);
1556 err = cache_register_net(cd, net);
1557 if (err) {
1558 cache_destroy_net(cd, net);
1559 return err;
1560 }
1561 sn->ip_map_cache = cd;
1562 return 0;
1563 }
1564
ip_map_cache_destroy(struct net * net)1565 void ip_map_cache_destroy(struct net *net)
1566 {
1567 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1568 struct cache_detail *cd = sn->ip_map_cache;
1569
1570 sn->ip_map_cache = NULL;
1571 cache_purge(cd);
1572 cache_unregister_net(cd, net);
1573 cache_destroy_net(cd, net);
1574 }
1575