1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Neil Brown <neilb@cse.unsw.edu.au>
4  * J. Bruce Fields <bfields@umich.edu>
5  * Andy Adamson <andros@umich.edu>
6  * Dug Song <dugsong@monkey.org>
7  *
8  * RPCSEC_GSS server authentication.
9  * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
10  * (gssapi)
11  *
12  * The RPCSEC_GSS involves three stages:
13  *  1/ context creation
14  *  2/ data exchange
15  *  3/ context destruction
16  *
17  * Context creation is handled largely by upcalls to user-space.
18  *  In particular, GSS_Accept_sec_context is handled by an upcall
19  * Data exchange is handled entirely within the kernel
20  *  In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
21  * Context destruction is handled in-kernel
22  *  GSS_Delete_sec_context is in-kernel
23  *
24  * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
25  * The context handle and gss_token are used as a key into the rpcsec_init cache.
26  * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
27  * being major_status, minor_status, context_handle, reply_token.
28  * These are sent back to the client.
29  * Sequence window management is handled by the kernel.  The window size if currently
30  * a compile time constant.
31  *
32  * When user-space is happy that a context is established, it places an entry
33  * in the rpcsec_context cache. The key for this cache is the context_handle.
34  * The content includes:
35  *   uid/gidlist - for determining access rights
36  *   mechanism type
37  *   mechanism specific information, such as a key
38  *
39  */
40 
41 #include <linux/slab.h>
42 #include <linux/types.h>
43 #include <linux/module.h>
44 #include <linux/pagemap.h>
45 #include <linux/user_namespace.h>
46 
47 #include <linux/sunrpc/auth_gss.h>
48 #include <linux/sunrpc/gss_err.h>
49 #include <linux/sunrpc/svcauth.h>
50 #include <linux/sunrpc/svcauth_gss.h>
51 #include <linux/sunrpc/cache.h>
52 
53 #include <trace/events/rpcgss.h>
54 
55 #include "gss_rpc_upcall.h"
56 
57 
58 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
59  * into replies.
60  *
61  * Key is context handle (\x if empty) and gss_token.
62  * Content is major_status minor_status (integers) context_handle, reply_token.
63  *
64  */
65 
66 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
67 {
68 	return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
69 }
70 
71 #define	RSI_HASHBITS	6
72 #define	RSI_HASHMAX	(1<<RSI_HASHBITS)
73 
74 struct rsi {
75 	struct cache_head	h;
76 	struct xdr_netobj	in_handle, in_token;
77 	struct xdr_netobj	out_handle, out_token;
78 	int			major_status, minor_status;
79 	struct rcu_head		rcu_head;
80 };
81 
82 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
83 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
84 
85 static void rsi_free(struct rsi *rsii)
86 {
87 	kfree(rsii->in_handle.data);
88 	kfree(rsii->in_token.data);
89 	kfree(rsii->out_handle.data);
90 	kfree(rsii->out_token.data);
91 }
92 
93 static void rsi_free_rcu(struct rcu_head *head)
94 {
95 	struct rsi *rsii = container_of(head, struct rsi, rcu_head);
96 
97 	rsi_free(rsii);
98 	kfree(rsii);
99 }
100 
101 static void rsi_put(struct kref *ref)
102 {
103 	struct rsi *rsii = container_of(ref, struct rsi, h.ref);
104 
105 	call_rcu(&rsii->rcu_head, rsi_free_rcu);
106 }
107 
108 static inline int rsi_hash(struct rsi *item)
109 {
110 	return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
111 	     ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
112 }
113 
114 static int rsi_match(struct cache_head *a, struct cache_head *b)
115 {
116 	struct rsi *item = container_of(a, struct rsi, h);
117 	struct rsi *tmp = container_of(b, struct rsi, h);
118 	return netobj_equal(&item->in_handle, &tmp->in_handle) &&
119 	       netobj_equal(&item->in_token, &tmp->in_token);
120 }
121 
122 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
123 {
124 	dst->len = len;
125 	dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
126 	if (len && !dst->data)
127 		return -ENOMEM;
128 	return 0;
129 }
130 
131 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
132 {
133 	return dup_to_netobj(dst, src->data, src->len);
134 }
135 
136 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
137 {
138 	struct rsi *new = container_of(cnew, struct rsi, h);
139 	struct rsi *item = container_of(citem, struct rsi, h);
140 
141 	new->out_handle.data = NULL;
142 	new->out_handle.len = 0;
143 	new->out_token.data = NULL;
144 	new->out_token.len = 0;
145 	new->in_handle.len = item->in_handle.len;
146 	item->in_handle.len = 0;
147 	new->in_token.len = item->in_token.len;
148 	item->in_token.len = 0;
149 	new->in_handle.data = item->in_handle.data;
150 	item->in_handle.data = NULL;
151 	new->in_token.data = item->in_token.data;
152 	item->in_token.data = NULL;
153 }
154 
155 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
156 {
157 	struct rsi *new = container_of(cnew, struct rsi, h);
158 	struct rsi *item = container_of(citem, struct rsi, h);
159 
160 	BUG_ON(new->out_handle.data || new->out_token.data);
161 	new->out_handle.len = item->out_handle.len;
162 	item->out_handle.len = 0;
163 	new->out_token.len = item->out_token.len;
164 	item->out_token.len = 0;
165 	new->out_handle.data = item->out_handle.data;
166 	item->out_handle.data = NULL;
167 	new->out_token.data = item->out_token.data;
168 	item->out_token.data = NULL;
169 
170 	new->major_status = item->major_status;
171 	new->minor_status = item->minor_status;
172 }
173 
174 static struct cache_head *rsi_alloc(void)
175 {
176 	struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
177 	if (rsii)
178 		return &rsii->h;
179 	else
180 		return NULL;
181 }
182 
183 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
184 {
185 	return sunrpc_cache_pipe_upcall_timeout(cd, h);
186 }
187 
188 static void rsi_request(struct cache_detail *cd,
189 		       struct cache_head *h,
190 		       char **bpp, int *blen)
191 {
192 	struct rsi *rsii = container_of(h, struct rsi, h);
193 
194 	qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
195 	qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
196 	(*bpp)[-1] = '\n';
197 	WARN_ONCE(*blen < 0,
198 		  "RPCSEC/GSS credential too large - please use gssproxy\n");
199 }
200 
201 static int rsi_parse(struct cache_detail *cd,
202 		    char *mesg, int mlen)
203 {
204 	/* context token expiry major minor context token */
205 	char *buf = mesg;
206 	char *ep;
207 	int len;
208 	struct rsi rsii, *rsip = NULL;
209 	time64_t expiry;
210 	int status = -EINVAL;
211 
212 	memset(&rsii, 0, sizeof(rsii));
213 	/* handle */
214 	len = qword_get(&mesg, buf, mlen);
215 	if (len < 0)
216 		goto out;
217 	status = -ENOMEM;
218 	if (dup_to_netobj(&rsii.in_handle, buf, len))
219 		goto out;
220 
221 	/* token */
222 	len = qword_get(&mesg, buf, mlen);
223 	status = -EINVAL;
224 	if (len < 0)
225 		goto out;
226 	status = -ENOMEM;
227 	if (dup_to_netobj(&rsii.in_token, buf, len))
228 		goto out;
229 
230 	rsip = rsi_lookup(cd, &rsii);
231 	if (!rsip)
232 		goto out;
233 
234 	rsii.h.flags = 0;
235 	/* expiry */
236 	expiry = get_expiry(&mesg);
237 	status = -EINVAL;
238 	if (expiry == 0)
239 		goto out;
240 
241 	/* major/minor */
242 	len = qword_get(&mesg, buf, mlen);
243 	if (len <= 0)
244 		goto out;
245 	rsii.major_status = simple_strtoul(buf, &ep, 10);
246 	if (*ep)
247 		goto out;
248 	len = qword_get(&mesg, buf, mlen);
249 	if (len <= 0)
250 		goto out;
251 	rsii.minor_status = simple_strtoul(buf, &ep, 10);
252 	if (*ep)
253 		goto out;
254 
255 	/* out_handle */
256 	len = qword_get(&mesg, buf, mlen);
257 	if (len < 0)
258 		goto out;
259 	status = -ENOMEM;
260 	if (dup_to_netobj(&rsii.out_handle, buf, len))
261 		goto out;
262 
263 	/* out_token */
264 	len = qword_get(&mesg, buf, mlen);
265 	status = -EINVAL;
266 	if (len < 0)
267 		goto out;
268 	status = -ENOMEM;
269 	if (dup_to_netobj(&rsii.out_token, buf, len))
270 		goto out;
271 	rsii.h.expiry_time = expiry;
272 	rsip = rsi_update(cd, &rsii, rsip);
273 	status = 0;
274 out:
275 	rsi_free(&rsii);
276 	if (rsip)
277 		cache_put(&rsip->h, cd);
278 	else
279 		status = -ENOMEM;
280 	return status;
281 }
282 
283 static const struct cache_detail rsi_cache_template = {
284 	.owner		= THIS_MODULE,
285 	.hash_size	= RSI_HASHMAX,
286 	.name           = "auth.rpcsec.init",
287 	.cache_put      = rsi_put,
288 	.cache_upcall	= rsi_upcall,
289 	.cache_request  = rsi_request,
290 	.cache_parse    = rsi_parse,
291 	.match		= rsi_match,
292 	.init		= rsi_init,
293 	.update		= update_rsi,
294 	.alloc		= rsi_alloc,
295 };
296 
297 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
298 {
299 	struct cache_head *ch;
300 	int hash = rsi_hash(item);
301 
302 	ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
303 	if (ch)
304 		return container_of(ch, struct rsi, h);
305 	else
306 		return NULL;
307 }
308 
309 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
310 {
311 	struct cache_head *ch;
312 	int hash = rsi_hash(new);
313 
314 	ch = sunrpc_cache_update(cd, &new->h,
315 				 &old->h, hash);
316 	if (ch)
317 		return container_of(ch, struct rsi, h);
318 	else
319 		return NULL;
320 }
321 
322 
323 /*
324  * The rpcsec_context cache is used to store a context that is
325  * used in data exchange.
326  * The key is a context handle. The content is:
327  *  uid, gidlist, mechanism, service-set, mech-specific-data
328  */
329 
330 #define	RSC_HASHBITS	10
331 #define	RSC_HASHMAX	(1<<RSC_HASHBITS)
332 
333 #define GSS_SEQ_WIN	128
334 
335 struct gss_svc_seq_data {
336 	/* highest seq number seen so far: */
337 	u32			sd_max;
338 	/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
339 	 * sd_win is nonzero iff sequence number i has been seen already: */
340 	unsigned long		sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
341 	spinlock_t		sd_lock;
342 };
343 
344 struct rsc {
345 	struct cache_head	h;
346 	struct xdr_netobj	handle;
347 	struct svc_cred		cred;
348 	struct gss_svc_seq_data	seqdata;
349 	struct gss_ctx		*mechctx;
350 	struct rcu_head		rcu_head;
351 };
352 
353 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
354 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
355 
356 static void rsc_free(struct rsc *rsci)
357 {
358 	kfree(rsci->handle.data);
359 	if (rsci->mechctx)
360 		gss_delete_sec_context(&rsci->mechctx);
361 	free_svc_cred(&rsci->cred);
362 }
363 
364 static void rsc_free_rcu(struct rcu_head *head)
365 {
366 	struct rsc *rsci = container_of(head, struct rsc, rcu_head);
367 
368 	kfree(rsci->handle.data);
369 	kfree(rsci);
370 }
371 
372 static void rsc_put(struct kref *ref)
373 {
374 	struct rsc *rsci = container_of(ref, struct rsc, h.ref);
375 
376 	if (rsci->mechctx)
377 		gss_delete_sec_context(&rsci->mechctx);
378 	free_svc_cred(&rsci->cred);
379 	call_rcu(&rsci->rcu_head, rsc_free_rcu);
380 }
381 
382 static inline int
383 rsc_hash(struct rsc *rsci)
384 {
385 	return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
386 }
387 
388 static int
389 rsc_match(struct cache_head *a, struct cache_head *b)
390 {
391 	struct rsc *new = container_of(a, struct rsc, h);
392 	struct rsc *tmp = container_of(b, struct rsc, h);
393 
394 	return netobj_equal(&new->handle, &tmp->handle);
395 }
396 
397 static void
398 rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
399 {
400 	struct rsc *new = container_of(cnew, struct rsc, h);
401 	struct rsc *tmp = container_of(ctmp, struct rsc, h);
402 
403 	new->handle.len = tmp->handle.len;
404 	tmp->handle.len = 0;
405 	new->handle.data = tmp->handle.data;
406 	tmp->handle.data = NULL;
407 	new->mechctx = NULL;
408 	init_svc_cred(&new->cred);
409 }
410 
411 static void
412 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
413 {
414 	struct rsc *new = container_of(cnew, struct rsc, h);
415 	struct rsc *tmp = container_of(ctmp, struct rsc, h);
416 
417 	new->mechctx = tmp->mechctx;
418 	tmp->mechctx = NULL;
419 	memset(&new->seqdata, 0, sizeof(new->seqdata));
420 	spin_lock_init(&new->seqdata.sd_lock);
421 	new->cred = tmp->cred;
422 	init_svc_cred(&tmp->cred);
423 }
424 
425 static struct cache_head *
426 rsc_alloc(void)
427 {
428 	struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
429 	if (rsci)
430 		return &rsci->h;
431 	else
432 		return NULL;
433 }
434 
435 static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
436 {
437 	return -EINVAL;
438 }
439 
440 static int rsc_parse(struct cache_detail *cd,
441 		     char *mesg, int mlen)
442 {
443 	/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
444 	char *buf = mesg;
445 	int id;
446 	int len, rv;
447 	struct rsc rsci, *rscp = NULL;
448 	time64_t expiry;
449 	int status = -EINVAL;
450 	struct gss_api_mech *gm = NULL;
451 
452 	memset(&rsci, 0, sizeof(rsci));
453 	/* context handle */
454 	len = qword_get(&mesg, buf, mlen);
455 	if (len < 0) goto out;
456 	status = -ENOMEM;
457 	if (dup_to_netobj(&rsci.handle, buf, len))
458 		goto out;
459 
460 	rsci.h.flags = 0;
461 	/* expiry */
462 	expiry = get_expiry(&mesg);
463 	status = -EINVAL;
464 	if (expiry == 0)
465 		goto out;
466 
467 	rscp = rsc_lookup(cd, &rsci);
468 	if (!rscp)
469 		goto out;
470 
471 	/* uid, or NEGATIVE */
472 	rv = get_int(&mesg, &id);
473 	if (rv == -EINVAL)
474 		goto out;
475 	if (rv == -ENOENT)
476 		set_bit(CACHE_NEGATIVE, &rsci.h.flags);
477 	else {
478 		int N, i;
479 
480 		/*
481 		 * NOTE: we skip uid_valid()/gid_valid() checks here:
482 		 * instead, * -1 id's are later mapped to the
483 		 * (export-specific) anonymous id by nfsd_setuser.
484 		 *
485 		 * (But supplementary gid's get no such special
486 		 * treatment so are checked for validity here.)
487 		 */
488 		/* uid */
489 		rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
490 
491 		/* gid */
492 		if (get_int(&mesg, &id))
493 			goto out;
494 		rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
495 
496 		/* number of additional gid's */
497 		if (get_int(&mesg, &N))
498 			goto out;
499 		if (N < 0 || N > NGROUPS_MAX)
500 			goto out;
501 		status = -ENOMEM;
502 		rsci.cred.cr_group_info = groups_alloc(N);
503 		if (rsci.cred.cr_group_info == NULL)
504 			goto out;
505 
506 		/* gid's */
507 		status = -EINVAL;
508 		for (i=0; i<N; i++) {
509 			kgid_t kgid;
510 			if (get_int(&mesg, &id))
511 				goto out;
512 			kgid = make_kgid(current_user_ns(), id);
513 			if (!gid_valid(kgid))
514 				goto out;
515 			rsci.cred.cr_group_info->gid[i] = kgid;
516 		}
517 		groups_sort(rsci.cred.cr_group_info);
518 
519 		/* mech name */
520 		len = qword_get(&mesg, buf, mlen);
521 		if (len < 0)
522 			goto out;
523 		gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
524 		status = -EOPNOTSUPP;
525 		if (!gm)
526 			goto out;
527 
528 		status = -EINVAL;
529 		/* mech-specific data: */
530 		len = qword_get(&mesg, buf, mlen);
531 		if (len < 0)
532 			goto out;
533 		status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
534 						NULL, GFP_KERNEL);
535 		if (status)
536 			goto out;
537 
538 		/* get client name */
539 		len = qword_get(&mesg, buf, mlen);
540 		if (len > 0) {
541 			rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
542 			if (!rsci.cred.cr_principal) {
543 				status = -ENOMEM;
544 				goto out;
545 			}
546 		}
547 
548 	}
549 	rsci.h.expiry_time = expiry;
550 	rscp = rsc_update(cd, &rsci, rscp);
551 	status = 0;
552 out:
553 	rsc_free(&rsci);
554 	if (rscp)
555 		cache_put(&rscp->h, cd);
556 	else
557 		status = -ENOMEM;
558 	return status;
559 }
560 
561 static const struct cache_detail rsc_cache_template = {
562 	.owner		= THIS_MODULE,
563 	.hash_size	= RSC_HASHMAX,
564 	.name		= "auth.rpcsec.context",
565 	.cache_put	= rsc_put,
566 	.cache_upcall	= rsc_upcall,
567 	.cache_parse	= rsc_parse,
568 	.match		= rsc_match,
569 	.init		= rsc_init,
570 	.update		= update_rsc,
571 	.alloc		= rsc_alloc,
572 };
573 
574 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
575 {
576 	struct cache_head *ch;
577 	int hash = rsc_hash(item);
578 
579 	ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
580 	if (ch)
581 		return container_of(ch, struct rsc, h);
582 	else
583 		return NULL;
584 }
585 
586 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
587 {
588 	struct cache_head *ch;
589 	int hash = rsc_hash(new);
590 
591 	ch = sunrpc_cache_update(cd, &new->h,
592 				 &old->h, hash);
593 	if (ch)
594 		return container_of(ch, struct rsc, h);
595 	else
596 		return NULL;
597 }
598 
599 
600 static struct rsc *
601 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
602 {
603 	struct rsc rsci;
604 	struct rsc *found;
605 
606 	memset(&rsci, 0, sizeof(rsci));
607 	if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
608 		return NULL;
609 	found = rsc_lookup(cd, &rsci);
610 	rsc_free(&rsci);
611 	if (!found)
612 		return NULL;
613 	if (cache_check(cd, &found->h, NULL))
614 		return NULL;
615 	return found;
616 }
617 
618 /**
619  * gss_check_seq_num - GSS sequence number window check
620  * @rqstp: RPC Call to use when reporting errors
621  * @rsci: cached GSS context state (updated on return)
622  * @seq_num: sequence number to check
623  *
624  * Implements sequence number algorithm as specified in
625  * RFC 2203, Section 5.3.3.1. "Context Management".
626  *
627  * Return values:
628  *   %true: @rqstp's GSS sequence number is inside the window
629  *   %false: @rqstp's GSS sequence number is outside the window
630  */
631 static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
632 			      u32 seq_num)
633 {
634 	struct gss_svc_seq_data *sd = &rsci->seqdata;
635 	bool result = false;
636 
637 	spin_lock(&sd->sd_lock);
638 	if (seq_num > sd->sd_max) {
639 		if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
640 			memset(sd->sd_win, 0, sizeof(sd->sd_win));
641 			sd->sd_max = seq_num;
642 		} else while (sd->sd_max < seq_num) {
643 			sd->sd_max++;
644 			__clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
645 		}
646 		__set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
647 		goto ok;
648 	} else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
649 		goto toolow;
650 	}
651 	if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
652 		goto alreadyseen;
653 
654 ok:
655 	result = true;
656 out:
657 	spin_unlock(&sd->sd_lock);
658 	return result;
659 
660 toolow:
661 	trace_rpcgss_svc_seqno_low(rqstp, seq_num,
662 				   sd->sd_max - GSS_SEQ_WIN,
663 				   sd->sd_max);
664 	goto out;
665 alreadyseen:
666 	trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
667 	goto out;
668 }
669 
670 static inline u32 round_up_to_quad(u32 i)
671 {
672 	return (i + 3 ) & ~3;
673 }
674 
675 static inline int
676 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
677 {
678 	int l;
679 
680 	if (argv->iov_len < 4)
681 		return -1;
682 	o->len = svc_getnl(argv);
683 	l = round_up_to_quad(o->len);
684 	if (argv->iov_len < l)
685 		return -1;
686 	o->data = argv->iov_base;
687 	argv->iov_base += l;
688 	argv->iov_len -= l;
689 	return 0;
690 }
691 
692 static inline int
693 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
694 {
695 	u8 *p;
696 
697 	if (resv->iov_len + 4 > PAGE_SIZE)
698 		return -1;
699 	svc_putnl(resv, o->len);
700 	p = resv->iov_base + resv->iov_len;
701 	resv->iov_len += round_up_to_quad(o->len);
702 	if (resv->iov_len > PAGE_SIZE)
703 		return -1;
704 	memcpy(p, o->data, o->len);
705 	memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
706 	return 0;
707 }
708 
709 /*
710  * Verify the checksum on the header and return SVC_OK on success.
711  * Otherwise, return SVC_DROP (in the case of a bad sequence number)
712  * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat.
713  */
714 static int
715 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
716 		  __be32 *rpcstart, struct rpc_gss_wire_cred *gc)
717 {
718 	struct gss_ctx		*ctx_id = rsci->mechctx;
719 	struct xdr_buf		rpchdr;
720 	struct xdr_netobj	checksum;
721 	u32			flavor = 0;
722 	struct kvec		*argv = &rqstp->rq_arg.head[0];
723 	struct kvec		iov;
724 
725 	/* data to compute the checksum over: */
726 	iov.iov_base = rpcstart;
727 	iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
728 	xdr_buf_from_iov(&iov, &rpchdr);
729 
730 	rqstp->rq_auth_stat = rpc_autherr_badverf;
731 	if (argv->iov_len < 4)
732 		return SVC_DENIED;
733 	flavor = svc_getnl(argv);
734 	if (flavor != RPC_AUTH_GSS)
735 		return SVC_DENIED;
736 	if (svc_safe_getnetobj(argv, &checksum))
737 		return SVC_DENIED;
738 
739 	if (rqstp->rq_deferred) /* skip verification of revisited request */
740 		return SVC_OK;
741 	if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
742 		rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
743 		return SVC_DENIED;
744 	}
745 
746 	if (gc->gc_seq > MAXSEQ) {
747 		trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
748 		rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
749 		return SVC_DENIED;
750 	}
751 	if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
752 		return SVC_DROP;
753 	return SVC_OK;
754 }
755 
756 static int
757 gss_write_null_verf(struct svc_rqst *rqstp)
758 {
759 	__be32     *p;
760 
761 	svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
762 	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
763 	/* don't really need to check if head->iov_len > PAGE_SIZE ... */
764 	*p++ = 0;
765 	if (!xdr_ressize_check(rqstp, p))
766 		return -1;
767 	return 0;
768 }
769 
770 static int
771 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
772 {
773 	__be32			*xdr_seq;
774 	u32			maj_stat;
775 	struct xdr_buf		verf_data;
776 	struct xdr_netobj	mic;
777 	__be32			*p;
778 	struct kvec		iov;
779 	int err = -1;
780 
781 	svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
782 	xdr_seq = kmalloc(4, GFP_KERNEL);
783 	if (!xdr_seq)
784 		return -1;
785 	*xdr_seq = htonl(seq);
786 
787 	iov.iov_base = xdr_seq;
788 	iov.iov_len = 4;
789 	xdr_buf_from_iov(&iov, &verf_data);
790 	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
791 	mic.data = (u8 *)(p + 1);
792 	maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
793 	if (maj_stat != GSS_S_COMPLETE)
794 		goto out;
795 	*p++ = htonl(mic.len);
796 	memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
797 	p += XDR_QUADLEN(mic.len);
798 	if (!xdr_ressize_check(rqstp, p))
799 		goto out;
800 	err = 0;
801 out:
802 	kfree(xdr_seq);
803 	return err;
804 }
805 
806 struct gss_domain {
807 	struct auth_domain	h;
808 	u32			pseudoflavor;
809 };
810 
811 static struct auth_domain *
812 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
813 {
814 	char *name;
815 
816 	name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
817 	if (!name)
818 		return NULL;
819 	return auth_domain_find(name);
820 }
821 
822 static struct auth_ops svcauthops_gss;
823 
824 u32 svcauth_gss_flavor(struct auth_domain *dom)
825 {
826 	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
827 
828 	return gd->pseudoflavor;
829 }
830 
831 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
832 
833 struct auth_domain *
834 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
835 {
836 	struct gss_domain	*new;
837 	struct auth_domain	*test;
838 	int			stat = -ENOMEM;
839 
840 	new = kmalloc(sizeof(*new), GFP_KERNEL);
841 	if (!new)
842 		goto out;
843 	kref_init(&new->h.ref);
844 	new->h.name = kstrdup(name, GFP_KERNEL);
845 	if (!new->h.name)
846 		goto out_free_dom;
847 	new->h.flavour = &svcauthops_gss;
848 	new->pseudoflavor = pseudoflavor;
849 
850 	test = auth_domain_lookup(name, &new->h);
851 	if (test != &new->h) {
852 		pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
853 			name);
854 		stat = -EADDRINUSE;
855 		auth_domain_put(test);
856 		goto out_free_name;
857 	}
858 	return test;
859 
860 out_free_name:
861 	kfree(new->h.name);
862 out_free_dom:
863 	kfree(new);
864 out:
865 	return ERR_PTR(stat);
866 }
867 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
868 
869 static inline int
870 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
871 {
872 	__be32  raw;
873 	int     status;
874 
875 	status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
876 	if (status)
877 		return status;
878 	*obj = ntohl(raw);
879 	return 0;
880 }
881 
882 /* It would be nice if this bit of code could be shared with the client.
883  * Obstacles:
884  *	The client shouldn't malloc(), would have to pass in own memory.
885  *	The server uses base of head iovec as read pointer, while the
886  *	client uses separate pointer. */
887 static int
888 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
889 {
890 	u32 integ_len, rseqno, maj_stat;
891 	int stat = -EINVAL;
892 	struct xdr_netobj mic;
893 	struct xdr_buf integ_buf;
894 
895 	mic.data = NULL;
896 
897 	/* NFS READ normally uses splice to send data in-place. However
898 	 * the data in cache can change after the reply's MIC is computed
899 	 * but before the RPC reply is sent. To prevent the client from
900 	 * rejecting the server-computed MIC in this somewhat rare case,
901 	 * do not use splice with the GSS integrity service.
902 	 */
903 	clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
904 
905 	/* Did we already verify the signature on the original pass through? */
906 	if (rqstp->rq_deferred)
907 		return 0;
908 
909 	integ_len = svc_getnl(&buf->head[0]);
910 	if (integ_len & 3)
911 		goto unwrap_failed;
912 	if (integ_len > buf->len)
913 		goto unwrap_failed;
914 	if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
915 		goto unwrap_failed;
916 
917 	/* copy out mic... */
918 	if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
919 		goto unwrap_failed;
920 	if (mic.len > RPC_MAX_AUTH_SIZE)
921 		goto unwrap_failed;
922 	mic.data = kmalloc(mic.len, GFP_KERNEL);
923 	if (!mic.data)
924 		goto unwrap_failed;
925 	if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
926 		goto unwrap_failed;
927 	maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
928 	if (maj_stat != GSS_S_COMPLETE)
929 		goto bad_mic;
930 	rseqno = svc_getnl(&buf->head[0]);
931 	if (rseqno != seq)
932 		goto bad_seqno;
933 	/* trim off the mic and padding at the end before returning */
934 	xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
935 	stat = 0;
936 out:
937 	kfree(mic.data);
938 	return stat;
939 
940 unwrap_failed:
941 	trace_rpcgss_svc_unwrap_failed(rqstp);
942 	goto out;
943 bad_seqno:
944 	trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
945 	goto out;
946 bad_mic:
947 	trace_rpcgss_svc_mic(rqstp, maj_stat);
948 	goto out;
949 }
950 
951 static inline int
952 total_buf_len(struct xdr_buf *buf)
953 {
954 	return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
955 }
956 
957 static void
958 fix_priv_head(struct xdr_buf *buf, int pad)
959 {
960 	if (buf->page_len == 0) {
961 		/* We need to adjust head and buf->len in tandem in this
962 		 * case to make svc_defer() work--it finds the original
963 		 * buffer start using buf->len - buf->head[0].iov_len. */
964 		buf->head[0].iov_len -= pad;
965 	}
966 }
967 
968 static int
969 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
970 {
971 	u32 priv_len, maj_stat;
972 	int pad, remaining_len, offset;
973 	u32 rseqno;
974 
975 	clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
976 
977 	priv_len = svc_getnl(&buf->head[0]);
978 	if (rqstp->rq_deferred) {
979 		/* Already decrypted last time through! The sequence number
980 		 * check at out_seq is unnecessary but harmless: */
981 		goto out_seq;
982 	}
983 	/* buf->len is the number of bytes from the original start of the
984 	 * request to the end, where head[0].iov_len is just the bytes
985 	 * not yet read from the head, so these two values are different: */
986 	remaining_len = total_buf_len(buf);
987 	if (priv_len > remaining_len)
988 		goto unwrap_failed;
989 	pad = remaining_len - priv_len;
990 	buf->len -= pad;
991 	fix_priv_head(buf, pad);
992 
993 	maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
994 	pad = priv_len - buf->len;
995 	/* The upper layers assume the buffer is aligned on 4-byte boundaries.
996 	 * In the krb5p case, at least, the data ends up offset, so we need to
997 	 * move it around. */
998 	/* XXX: This is very inefficient.  It would be better to either do
999 	 * this while we encrypt, or maybe in the receive code, if we can peak
1000 	 * ahead and work out the service and mechanism there. */
1001 	offset = xdr_pad_size(buf->head[0].iov_len);
1002 	if (offset) {
1003 		buf->buflen = RPCSVC_MAXPAYLOAD;
1004 		xdr_shift_buf(buf, offset);
1005 		fix_priv_head(buf, pad);
1006 	}
1007 	if (maj_stat != GSS_S_COMPLETE)
1008 		goto bad_unwrap;
1009 out_seq:
1010 	rseqno = svc_getnl(&buf->head[0]);
1011 	if (rseqno != seq)
1012 		goto bad_seqno;
1013 	return 0;
1014 
1015 unwrap_failed:
1016 	trace_rpcgss_svc_unwrap_failed(rqstp);
1017 	return -EINVAL;
1018 bad_seqno:
1019 	trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
1020 	return -EINVAL;
1021 bad_unwrap:
1022 	trace_rpcgss_svc_unwrap(rqstp, maj_stat);
1023 	return -EINVAL;
1024 }
1025 
1026 struct gss_svc_data {
1027 	/* decoded gss client cred: */
1028 	struct rpc_gss_wire_cred	clcred;
1029 	/* save a pointer to the beginning of the encoded verifier,
1030 	 * for use in encryption/checksumming in svcauth_gss_release: */
1031 	__be32				*verf_start;
1032 	struct rsc			*rsci;
1033 };
1034 
1035 static int
1036 svcauth_gss_set_client(struct svc_rqst *rqstp)
1037 {
1038 	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1039 	struct rsc *rsci = svcdata->rsci;
1040 	struct rpc_gss_wire_cred *gc = &svcdata->clcred;
1041 	int stat;
1042 
1043 	rqstp->rq_auth_stat = rpc_autherr_badcred;
1044 
1045 	/*
1046 	 * A gss export can be specified either by:
1047 	 * 	export	*(sec=krb5,rw)
1048 	 * or by
1049 	 * 	export gss/krb5(rw)
1050 	 * The latter is deprecated; but for backwards compatibility reasons
1051 	 * the nfsd code will still fall back on trying it if the former
1052 	 * doesn't work; so we try to make both available to nfsd, below.
1053 	 */
1054 	rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1055 	if (rqstp->rq_gssclient == NULL)
1056 		return SVC_DENIED;
1057 	stat = svcauth_unix_set_client(rqstp);
1058 	if (stat == SVC_DROP || stat == SVC_CLOSE)
1059 		return stat;
1060 
1061 	rqstp->rq_auth_stat = rpc_auth_ok;
1062 	return SVC_OK;
1063 }
1064 
1065 static inline int
1066 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1067 		struct xdr_netobj *out_handle, int *major_status)
1068 {
1069 	struct rsc *rsci;
1070 	int        rc;
1071 
1072 	if (*major_status != GSS_S_COMPLETE)
1073 		return gss_write_null_verf(rqstp);
1074 	rsci = gss_svc_searchbyctx(cd, out_handle);
1075 	if (rsci == NULL) {
1076 		*major_status = GSS_S_NO_CONTEXT;
1077 		return gss_write_null_verf(rqstp);
1078 	}
1079 	rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1080 	cache_put(&rsci->h, cd);
1081 	return rc;
1082 }
1083 
1084 static inline int
1085 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1086 		     struct kvec *argv, __be32 *authp,
1087 		     struct xdr_netobj *in_handle)
1088 {
1089 	/* Read the verifier; should be NULL: */
1090 	*authp = rpc_autherr_badverf;
1091 	if (argv->iov_len < 2 * 4)
1092 		return SVC_DENIED;
1093 	if (svc_getnl(argv) != RPC_AUTH_NULL)
1094 		return SVC_DENIED;
1095 	if (svc_getnl(argv) != 0)
1096 		return SVC_DENIED;
1097 	/* Martial context handle and token for upcall: */
1098 	*authp = rpc_autherr_badcred;
1099 	if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1100 		return SVC_DENIED;
1101 	if (dup_netobj(in_handle, &gc->gc_ctx))
1102 		return SVC_CLOSE;
1103 	*authp = rpc_autherr_badverf;
1104 
1105 	return 0;
1106 }
1107 
1108 static inline int
1109 gss_read_verf(struct rpc_gss_wire_cred *gc,
1110 	      struct kvec *argv, __be32 *authp,
1111 	      struct xdr_netobj *in_handle,
1112 	      struct xdr_netobj *in_token)
1113 {
1114 	struct xdr_netobj tmpobj;
1115 	int res;
1116 
1117 	res = gss_read_common_verf(gc, argv, authp, in_handle);
1118 	if (res)
1119 		return res;
1120 
1121 	if (svc_safe_getnetobj(argv, &tmpobj)) {
1122 		kfree(in_handle->data);
1123 		return SVC_DENIED;
1124 	}
1125 	if (dup_netobj(in_token, &tmpobj)) {
1126 		kfree(in_handle->data);
1127 		return SVC_CLOSE;
1128 	}
1129 
1130 	return 0;
1131 }
1132 
1133 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1134 {
1135 	u32 inlen;
1136 	int i;
1137 
1138 	i = 0;
1139 	inlen = in_token->page_len;
1140 	while (inlen) {
1141 		if (in_token->pages[i])
1142 			put_page(in_token->pages[i]);
1143 		inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1144 	}
1145 
1146 	kfree(in_token->pages);
1147 	in_token->pages = NULL;
1148 }
1149 
1150 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1151 			       struct rpc_gss_wire_cred *gc,
1152 			       struct xdr_netobj *in_handle,
1153 			       struct gssp_in_token *in_token)
1154 {
1155 	struct kvec *argv = &rqstp->rq_arg.head[0];
1156 	unsigned int length, pgto_offs, pgfrom_offs;
1157 	int pages, i, res, pgto, pgfrom;
1158 	size_t inlen, to_offs, from_offs;
1159 
1160 	res = gss_read_common_verf(gc, argv, &rqstp->rq_auth_stat, in_handle);
1161 	if (res)
1162 		return res;
1163 
1164 	inlen = svc_getnl(argv);
1165 	if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1166 		return SVC_DENIED;
1167 
1168 	pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1169 	in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1170 	if (!in_token->pages)
1171 		return SVC_DENIED;
1172 	in_token->page_base = 0;
1173 	in_token->page_len = inlen;
1174 	for (i = 0; i < pages; i++) {
1175 		in_token->pages[i] = alloc_page(GFP_KERNEL);
1176 		if (!in_token->pages[i]) {
1177 			gss_free_in_token_pages(in_token);
1178 			return SVC_DENIED;
1179 		}
1180 	}
1181 
1182 	length = min_t(unsigned int, inlen, argv->iov_len);
1183 	memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1184 	inlen -= length;
1185 
1186 	to_offs = length;
1187 	from_offs = rqstp->rq_arg.page_base;
1188 	while (inlen) {
1189 		pgto = to_offs >> PAGE_SHIFT;
1190 		pgfrom = from_offs >> PAGE_SHIFT;
1191 		pgto_offs = to_offs & ~PAGE_MASK;
1192 		pgfrom_offs = from_offs & ~PAGE_MASK;
1193 
1194 		length = min_t(unsigned int, inlen,
1195 			 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1196 			       PAGE_SIZE - pgfrom_offs));
1197 		memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1198 		       page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1199 		       length);
1200 
1201 		to_offs += length;
1202 		from_offs += length;
1203 		inlen -= length;
1204 	}
1205 	return 0;
1206 }
1207 
1208 static inline int
1209 gss_write_resv(struct kvec *resv, size_t size_limit,
1210 	       struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1211 	       int major_status, int minor_status)
1212 {
1213 	if (resv->iov_len + 4 > size_limit)
1214 		return -1;
1215 	svc_putnl(resv, RPC_SUCCESS);
1216 	if (svc_safe_putnetobj(resv, out_handle))
1217 		return -1;
1218 	if (resv->iov_len + 3 * 4 > size_limit)
1219 		return -1;
1220 	svc_putnl(resv, major_status);
1221 	svc_putnl(resv, minor_status);
1222 	svc_putnl(resv, GSS_SEQ_WIN);
1223 	if (svc_safe_putnetobj(resv, out_token))
1224 		return -1;
1225 	return 0;
1226 }
1227 
1228 /*
1229  * Having read the cred already and found we're in the context
1230  * initiation case, read the verifier and initiate (or check the results
1231  * of) upcalls to userspace for help with context initiation.  If
1232  * the upcall results are available, write the verifier and result.
1233  * Otherwise, drop the request pending an answer to the upcall.
1234  */
1235 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1236 				   struct rpc_gss_wire_cred *gc)
1237 {
1238 	struct kvec *argv = &rqstp->rq_arg.head[0];
1239 	struct kvec *resv = &rqstp->rq_res.head[0];
1240 	struct rsi *rsip, rsikey;
1241 	int ret;
1242 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1243 
1244 	memset(&rsikey, 0, sizeof(rsikey));
1245 	ret = gss_read_verf(gc, argv, &rqstp->rq_auth_stat,
1246 			    &rsikey.in_handle, &rsikey.in_token);
1247 	if (ret)
1248 		return ret;
1249 
1250 	/* Perform upcall, or find upcall result: */
1251 	rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1252 	rsi_free(&rsikey);
1253 	if (!rsip)
1254 		return SVC_CLOSE;
1255 	if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1256 		/* No upcall result: */
1257 		return SVC_CLOSE;
1258 
1259 	ret = SVC_CLOSE;
1260 	/* Got an answer to the upcall; use it: */
1261 	if (gss_write_init_verf(sn->rsc_cache, rqstp,
1262 				&rsip->out_handle, &rsip->major_status))
1263 		goto out;
1264 	if (gss_write_resv(resv, PAGE_SIZE,
1265 			   &rsip->out_handle, &rsip->out_token,
1266 			   rsip->major_status, rsip->minor_status))
1267 		goto out;
1268 
1269 	ret = SVC_COMPLETE;
1270 out:
1271 	cache_put(&rsip->h, sn->rsi_cache);
1272 	return ret;
1273 }
1274 
1275 static int gss_proxy_save_rsc(struct cache_detail *cd,
1276 				struct gssp_upcall_data *ud,
1277 				uint64_t *handle)
1278 {
1279 	struct rsc rsci, *rscp = NULL;
1280 	static atomic64_t ctxhctr;
1281 	long long ctxh;
1282 	struct gss_api_mech *gm = NULL;
1283 	time64_t expiry;
1284 	int status;
1285 
1286 	memset(&rsci, 0, sizeof(rsci));
1287 	/* context handle */
1288 	status = -ENOMEM;
1289 	/* the handle needs to be just a unique id,
1290 	 * use a static counter */
1291 	ctxh = atomic64_inc_return(&ctxhctr);
1292 
1293 	/* make a copy for the caller */
1294 	*handle = ctxh;
1295 
1296 	/* make a copy for the rsc cache */
1297 	if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1298 		goto out;
1299 	rscp = rsc_lookup(cd, &rsci);
1300 	if (!rscp)
1301 		goto out;
1302 
1303 	/* creds */
1304 	if (!ud->found_creds) {
1305 		/* userspace seem buggy, we should always get at least a
1306 		 * mapping to nobody */
1307 		goto out;
1308 	} else {
1309 		struct timespec64 boot;
1310 
1311 		/* steal creds */
1312 		rsci.cred = ud->creds;
1313 		memset(&ud->creds, 0, sizeof(struct svc_cred));
1314 
1315 		status = -EOPNOTSUPP;
1316 		/* get mech handle from OID */
1317 		gm = gss_mech_get_by_OID(&ud->mech_oid);
1318 		if (!gm)
1319 			goto out;
1320 		rsci.cred.cr_gss_mech = gm;
1321 
1322 		status = -EINVAL;
1323 		/* mech-specific data: */
1324 		status = gss_import_sec_context(ud->out_handle.data,
1325 						ud->out_handle.len,
1326 						gm, &rsci.mechctx,
1327 						&expiry, GFP_KERNEL);
1328 		if (status)
1329 			goto out;
1330 
1331 		getboottime64(&boot);
1332 		expiry -= boot.tv_sec;
1333 	}
1334 
1335 	rsci.h.expiry_time = expiry;
1336 	rscp = rsc_update(cd, &rsci, rscp);
1337 	status = 0;
1338 out:
1339 	rsc_free(&rsci);
1340 	if (rscp)
1341 		cache_put(&rscp->h, cd);
1342 	else
1343 		status = -ENOMEM;
1344 	return status;
1345 }
1346 
1347 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1348 				  struct rpc_gss_wire_cred *gc)
1349 {
1350 	struct kvec *resv = &rqstp->rq_res.head[0];
1351 	struct xdr_netobj cli_handle;
1352 	struct gssp_upcall_data ud;
1353 	uint64_t handle;
1354 	int status;
1355 	int ret;
1356 	struct net *net = SVC_NET(rqstp);
1357 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1358 
1359 	memset(&ud, 0, sizeof(ud));
1360 	ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
1361 	if (ret)
1362 		return ret;
1363 
1364 	ret = SVC_CLOSE;
1365 
1366 	/* Perform synchronous upcall to gss-proxy */
1367 	status = gssp_accept_sec_context_upcall(net, &ud);
1368 	if (status)
1369 		goto out;
1370 
1371 	trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1372 
1373 	switch (ud.major_status) {
1374 	case GSS_S_CONTINUE_NEEDED:
1375 		cli_handle = ud.out_handle;
1376 		break;
1377 	case GSS_S_COMPLETE:
1378 		status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1379 		if (status)
1380 			goto out;
1381 		cli_handle.data = (u8 *)&handle;
1382 		cli_handle.len = sizeof(handle);
1383 		break;
1384 	default:
1385 		goto out;
1386 	}
1387 
1388 	/* Got an answer to the upcall; use it: */
1389 	if (gss_write_init_verf(sn->rsc_cache, rqstp,
1390 				&cli_handle, &ud.major_status))
1391 		goto out;
1392 	if (gss_write_resv(resv, PAGE_SIZE,
1393 			   &cli_handle, &ud.out_token,
1394 			   ud.major_status, ud.minor_status))
1395 		goto out;
1396 
1397 	ret = SVC_COMPLETE;
1398 out:
1399 	gss_free_in_token_pages(&ud.in_token);
1400 	gssp_free_upcall_data(&ud);
1401 	return ret;
1402 }
1403 
1404 /*
1405  * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1406  * it to be changed if it's currently undefined (-1). If it's any other value
1407  * then return -EBUSY unless the type wouldn't have changed anyway.
1408  */
1409 static int set_gss_proxy(struct net *net, int type)
1410 {
1411 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1412 	int ret;
1413 
1414 	WARN_ON_ONCE(type != 0 && type != 1);
1415 	ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1416 	if (ret != -1 && ret != type)
1417 		return -EBUSY;
1418 	return 0;
1419 }
1420 
1421 static bool use_gss_proxy(struct net *net)
1422 {
1423 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1424 
1425 	/* If use_gss_proxy is still undefined, then try to disable it */
1426 	if (sn->use_gss_proxy == -1)
1427 		set_gss_proxy(net, 0);
1428 	return sn->use_gss_proxy;
1429 }
1430 
1431 #ifdef CONFIG_PROC_FS
1432 
1433 static ssize_t write_gssp(struct file *file, const char __user *buf,
1434 			 size_t count, loff_t *ppos)
1435 {
1436 	struct net *net = PDE_DATA(file_inode(file));
1437 	char tbuf[20];
1438 	unsigned long i;
1439 	int res;
1440 
1441 	if (*ppos || count > sizeof(tbuf)-1)
1442 		return -EINVAL;
1443 	if (copy_from_user(tbuf, buf, count))
1444 		return -EFAULT;
1445 
1446 	tbuf[count] = 0;
1447 	res = kstrtoul(tbuf, 0, &i);
1448 	if (res)
1449 		return res;
1450 	if (i != 1)
1451 		return -EINVAL;
1452 	res = set_gssp_clnt(net);
1453 	if (res)
1454 		return res;
1455 	res = set_gss_proxy(net, 1);
1456 	if (res)
1457 		return res;
1458 	return count;
1459 }
1460 
1461 static ssize_t read_gssp(struct file *file, char __user *buf,
1462 			 size_t count, loff_t *ppos)
1463 {
1464 	struct net *net = PDE_DATA(file_inode(file));
1465 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1466 	unsigned long p = *ppos;
1467 	char tbuf[10];
1468 	size_t len;
1469 
1470 	snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1471 	len = strlen(tbuf);
1472 	if (p >= len)
1473 		return 0;
1474 	len -= p;
1475 	if (len > count)
1476 		len = count;
1477 	if (copy_to_user(buf, (void *)(tbuf+p), len))
1478 		return -EFAULT;
1479 	*ppos += len;
1480 	return len;
1481 }
1482 
1483 static const struct proc_ops use_gss_proxy_proc_ops = {
1484 	.proc_open	= nonseekable_open,
1485 	.proc_write	= write_gssp,
1486 	.proc_read	= read_gssp,
1487 };
1488 
1489 static int create_use_gss_proxy_proc_entry(struct net *net)
1490 {
1491 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1492 	struct proc_dir_entry **p = &sn->use_gssp_proc;
1493 
1494 	sn->use_gss_proxy = -1;
1495 	*p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1496 			      sn->proc_net_rpc,
1497 			      &use_gss_proxy_proc_ops, net);
1498 	if (!*p)
1499 		return -ENOMEM;
1500 	init_gssp_clnt(sn);
1501 	return 0;
1502 }
1503 
1504 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1505 {
1506 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1507 
1508 	if (sn->use_gssp_proc) {
1509 		remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1510 		clear_gssp_clnt(sn);
1511 	}
1512 }
1513 #else /* CONFIG_PROC_FS */
1514 
1515 static int create_use_gss_proxy_proc_entry(struct net *net)
1516 {
1517 	return 0;
1518 }
1519 
1520 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1521 
1522 #endif /* CONFIG_PROC_FS */
1523 
1524 /*
1525  * Accept an rpcsec packet.
1526  * If context establishment, punt to user space
1527  * If data exchange, verify/decrypt
1528  * If context destruction, handle here
1529  * In the context establishment and destruction case we encode
1530  * response here and return SVC_COMPLETE.
1531  */
1532 static int
1533 svcauth_gss_accept(struct svc_rqst *rqstp)
1534 {
1535 	struct kvec	*argv = &rqstp->rq_arg.head[0];
1536 	struct kvec	*resv = &rqstp->rq_res.head[0];
1537 	u32		crlen;
1538 	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1539 	struct rpc_gss_wire_cred *gc;
1540 	struct rsc	*rsci = NULL;
1541 	__be32		*rpcstart;
1542 	__be32		*reject_stat = resv->iov_base + resv->iov_len;
1543 	int		ret;
1544 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1545 
1546 	rqstp->rq_auth_stat = rpc_autherr_badcred;
1547 	if (!svcdata)
1548 		svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1549 	if (!svcdata)
1550 		goto auth_err;
1551 	rqstp->rq_auth_data = svcdata;
1552 	svcdata->verf_start = NULL;
1553 	svcdata->rsci = NULL;
1554 	gc = &svcdata->clcred;
1555 
1556 	/* start of rpc packet is 7 u32's back from here:
1557 	 * xid direction rpcversion prog vers proc flavour
1558 	 */
1559 	rpcstart = argv->iov_base;
1560 	rpcstart -= 7;
1561 
1562 	/* credential is:
1563 	 *   version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1564 	 * at least 5 u32s, and is preceded by length, so that makes 6.
1565 	 */
1566 
1567 	if (argv->iov_len < 5 * 4)
1568 		goto auth_err;
1569 	crlen = svc_getnl(argv);
1570 	if (svc_getnl(argv) != RPC_GSS_VERSION)
1571 		goto auth_err;
1572 	gc->gc_proc = svc_getnl(argv);
1573 	gc->gc_seq = svc_getnl(argv);
1574 	gc->gc_svc = svc_getnl(argv);
1575 	if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1576 		goto auth_err;
1577 	if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1578 		goto auth_err;
1579 
1580 	if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1581 		goto auth_err;
1582 
1583 	rqstp->rq_auth_stat = rpc_autherr_badverf;
1584 	switch (gc->gc_proc) {
1585 	case RPC_GSS_PROC_INIT:
1586 	case RPC_GSS_PROC_CONTINUE_INIT:
1587 		if (use_gss_proxy(SVC_NET(rqstp)))
1588 			return svcauth_gss_proxy_init(rqstp, gc);
1589 		else
1590 			return svcauth_gss_legacy_init(rqstp, gc);
1591 	case RPC_GSS_PROC_DATA:
1592 	case RPC_GSS_PROC_DESTROY:
1593 		/* Look up the context, and check the verifier: */
1594 		rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1595 		rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1596 		if (!rsci)
1597 			goto auth_err;
1598 		switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1599 		case SVC_OK:
1600 			break;
1601 		case SVC_DENIED:
1602 			goto auth_err;
1603 		case SVC_DROP:
1604 			goto drop;
1605 		}
1606 		break;
1607 	default:
1608 		rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1609 		goto auth_err;
1610 	}
1611 
1612 	/* now act upon the command: */
1613 	switch (gc->gc_proc) {
1614 	case RPC_GSS_PROC_DESTROY:
1615 		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1616 			goto auth_err;
1617 		/* Delete the entry from the cache_list and call cache_put */
1618 		sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1619 		if (resv->iov_len + 4 > PAGE_SIZE)
1620 			goto drop;
1621 		svc_putnl(resv, RPC_SUCCESS);
1622 		goto complete;
1623 	case RPC_GSS_PROC_DATA:
1624 		rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1625 		svcdata->verf_start = resv->iov_base + resv->iov_len;
1626 		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1627 			goto auth_err;
1628 		rqstp->rq_cred = rsci->cred;
1629 		get_group_info(rsci->cred.cr_group_info);
1630 		rqstp->rq_auth_stat = rpc_autherr_badcred;
1631 		switch (gc->gc_svc) {
1632 		case RPC_GSS_SVC_NONE:
1633 			break;
1634 		case RPC_GSS_SVC_INTEGRITY:
1635 			/* placeholders for length and seq. number: */
1636 			svc_putnl(resv, 0);
1637 			svc_putnl(resv, 0);
1638 			if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1639 					gc->gc_seq, rsci->mechctx))
1640 				goto garbage_args;
1641 			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1642 			break;
1643 		case RPC_GSS_SVC_PRIVACY:
1644 			/* placeholders for length and seq. number: */
1645 			svc_putnl(resv, 0);
1646 			svc_putnl(resv, 0);
1647 			if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1648 					gc->gc_seq, rsci->mechctx))
1649 				goto garbage_args;
1650 			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1651 			break;
1652 		default:
1653 			goto auth_err;
1654 		}
1655 		svcdata->rsci = rsci;
1656 		cache_get(&rsci->h);
1657 		rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1658 					rsci->mechctx->mech_type,
1659 					GSS_C_QOP_DEFAULT,
1660 					gc->gc_svc);
1661 		ret = SVC_OK;
1662 		trace_rpcgss_svc_authenticate(rqstp, gc);
1663 		goto out;
1664 	}
1665 garbage_args:
1666 	ret = SVC_GARBAGE;
1667 	goto out;
1668 auth_err:
1669 	/* Restore write pointer to its original value: */
1670 	xdr_ressize_check(rqstp, reject_stat);
1671 	ret = SVC_DENIED;
1672 	goto out;
1673 complete:
1674 	ret = SVC_COMPLETE;
1675 	goto out;
1676 drop:
1677 	ret = SVC_CLOSE;
1678 out:
1679 	if (rsci)
1680 		cache_put(&rsci->h, sn->rsc_cache);
1681 	return ret;
1682 }
1683 
1684 static __be32 *
1685 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1686 {
1687 	__be32 *p;
1688 	u32 verf_len;
1689 
1690 	p = gsd->verf_start;
1691 	gsd->verf_start = NULL;
1692 
1693 	/* If the reply stat is nonzero, don't wrap: */
1694 	if (*(p-1) != rpc_success)
1695 		return NULL;
1696 	/* Skip the verifier: */
1697 	p += 1;
1698 	verf_len = ntohl(*p++);
1699 	p += XDR_QUADLEN(verf_len);
1700 	/* move accept_stat to right place: */
1701 	memcpy(p, p + 2, 4);
1702 	/* Also don't wrap if the accept stat is nonzero: */
1703 	if (*p != rpc_success) {
1704 		resbuf->head[0].iov_len -= 2 * 4;
1705 		return NULL;
1706 	}
1707 	p++;
1708 	return p;
1709 }
1710 
1711 static inline int
1712 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1713 {
1714 	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1715 	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1716 	struct xdr_buf *resbuf = &rqstp->rq_res;
1717 	struct xdr_buf integ_buf;
1718 	struct xdr_netobj mic;
1719 	struct kvec *resv;
1720 	__be32 *p;
1721 	int integ_offset, integ_len;
1722 	int stat = -EINVAL;
1723 
1724 	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1725 	if (p == NULL)
1726 		goto out;
1727 	integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1728 	integ_len = resbuf->len - integ_offset;
1729 	if (integ_len & 3)
1730 		goto out;
1731 	*p++ = htonl(integ_len);
1732 	*p++ = htonl(gc->gc_seq);
1733 	if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1734 		WARN_ON_ONCE(1);
1735 		goto out_err;
1736 	}
1737 	if (resbuf->tail[0].iov_base == NULL) {
1738 		if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1739 			goto out_err;
1740 		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1741 						+ resbuf->head[0].iov_len;
1742 		resbuf->tail[0].iov_len = 0;
1743 	}
1744 	resv = &resbuf->tail[0];
1745 	mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1746 	if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1747 		goto out_err;
1748 	svc_putnl(resv, mic.len);
1749 	memset(mic.data + mic.len, 0,
1750 			round_up_to_quad(mic.len) - mic.len);
1751 	resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1752 	/* not strictly required: */
1753 	resbuf->len += XDR_QUADLEN(mic.len) << 2;
1754 	if (resv->iov_len > PAGE_SIZE)
1755 		goto out_err;
1756 out:
1757 	stat = 0;
1758 out_err:
1759 	return stat;
1760 }
1761 
1762 static inline int
1763 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1764 {
1765 	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1766 	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1767 	struct xdr_buf *resbuf = &rqstp->rq_res;
1768 	struct page **inpages = NULL;
1769 	__be32 *p, *len;
1770 	int offset;
1771 	int pad;
1772 
1773 	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1774 	if (p == NULL)
1775 		return 0;
1776 	len = p++;
1777 	offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1778 	*p++ = htonl(gc->gc_seq);
1779 	inpages = resbuf->pages;
1780 	/* XXX: Would be better to write some xdr helper functions for
1781 	 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1782 
1783 	/*
1784 	 * If there is currently tail data, make sure there is
1785 	 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1786 	 * the page, and move the current tail data such that
1787 	 * there is RPC_MAX_AUTH_SIZE slack space available in
1788 	 * both the head and tail.
1789 	 */
1790 	if (resbuf->tail[0].iov_base) {
1791 		if (resbuf->tail[0].iov_base >=
1792 			resbuf->head[0].iov_base + PAGE_SIZE)
1793 			return -EINVAL;
1794 		if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1795 			return -EINVAL;
1796 		if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1797 				+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1798 			return -ENOMEM;
1799 		memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1800 			resbuf->tail[0].iov_base,
1801 			resbuf->tail[0].iov_len);
1802 		resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1803 	}
1804 	/*
1805 	 * If there is no current tail data, make sure there is
1806 	 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1807 	 * allotted page, and set up tail information such that there
1808 	 * is RPC_MAX_AUTH_SIZE slack space available in both the
1809 	 * head and tail.
1810 	 */
1811 	if (resbuf->tail[0].iov_base == NULL) {
1812 		if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1813 			return -ENOMEM;
1814 		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1815 			+ resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1816 		resbuf->tail[0].iov_len = 0;
1817 	}
1818 	if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1819 		return -ENOMEM;
1820 	*len = htonl(resbuf->len - offset);
1821 	pad = 3 - ((resbuf->len - offset - 1)&3);
1822 	p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1823 	memset(p, 0, pad);
1824 	resbuf->tail[0].iov_len += pad;
1825 	resbuf->len += pad;
1826 	return 0;
1827 }
1828 
1829 static int
1830 svcauth_gss_release(struct svc_rqst *rqstp)
1831 {
1832 	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1833 	struct rpc_gss_wire_cred *gc;
1834 	struct xdr_buf *resbuf = &rqstp->rq_res;
1835 	int stat = -EINVAL;
1836 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1837 
1838 	if (!gsd)
1839 		goto out;
1840 	gc = &gsd->clcred;
1841 	if (gc->gc_proc != RPC_GSS_PROC_DATA)
1842 		goto out;
1843 	/* Release can be called twice, but we only wrap once. */
1844 	if (gsd->verf_start == NULL)
1845 		goto out;
1846 	/* normally not set till svc_send, but we need it here: */
1847 	/* XXX: what for?  Do we mess it up the moment we call svc_putu32
1848 	 * or whatever? */
1849 	resbuf->len = total_buf_len(resbuf);
1850 	switch (gc->gc_svc) {
1851 	case RPC_GSS_SVC_NONE:
1852 		break;
1853 	case RPC_GSS_SVC_INTEGRITY:
1854 		stat = svcauth_gss_wrap_resp_integ(rqstp);
1855 		if (stat)
1856 			goto out_err;
1857 		break;
1858 	case RPC_GSS_SVC_PRIVACY:
1859 		stat = svcauth_gss_wrap_resp_priv(rqstp);
1860 		if (stat)
1861 			goto out_err;
1862 		break;
1863 	/*
1864 	 * For any other gc_svc value, svcauth_gss_accept() already set
1865 	 * the auth_error appropriately; just fall through:
1866 	 */
1867 	}
1868 
1869 out:
1870 	stat = 0;
1871 out_err:
1872 	if (rqstp->rq_client)
1873 		auth_domain_put(rqstp->rq_client);
1874 	rqstp->rq_client = NULL;
1875 	if (rqstp->rq_gssclient)
1876 		auth_domain_put(rqstp->rq_gssclient);
1877 	rqstp->rq_gssclient = NULL;
1878 	if (rqstp->rq_cred.cr_group_info)
1879 		put_group_info(rqstp->rq_cred.cr_group_info);
1880 	rqstp->rq_cred.cr_group_info = NULL;
1881 	if (gsd && gsd->rsci) {
1882 		cache_put(&gsd->rsci->h, sn->rsc_cache);
1883 		gsd->rsci = NULL;
1884 	}
1885 	return stat;
1886 }
1887 
1888 static void
1889 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1890 {
1891 	struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1892 	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1893 
1894 	kfree(dom->name);
1895 	kfree(gd);
1896 }
1897 
1898 static void
1899 svcauth_gss_domain_release(struct auth_domain *dom)
1900 {
1901 	call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1902 }
1903 
1904 static struct auth_ops svcauthops_gss = {
1905 	.name		= "rpcsec_gss",
1906 	.owner		= THIS_MODULE,
1907 	.flavour	= RPC_AUTH_GSS,
1908 	.accept		= svcauth_gss_accept,
1909 	.release	= svcauth_gss_release,
1910 	.domain_release = svcauth_gss_domain_release,
1911 	.set_client	= svcauth_gss_set_client,
1912 };
1913 
1914 static int rsi_cache_create_net(struct net *net)
1915 {
1916 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1917 	struct cache_detail *cd;
1918 	int err;
1919 
1920 	cd = cache_create_net(&rsi_cache_template, net);
1921 	if (IS_ERR(cd))
1922 		return PTR_ERR(cd);
1923 	err = cache_register_net(cd, net);
1924 	if (err) {
1925 		cache_destroy_net(cd, net);
1926 		return err;
1927 	}
1928 	sn->rsi_cache = cd;
1929 	return 0;
1930 }
1931 
1932 static void rsi_cache_destroy_net(struct net *net)
1933 {
1934 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1935 	struct cache_detail *cd = sn->rsi_cache;
1936 
1937 	sn->rsi_cache = NULL;
1938 	cache_purge(cd);
1939 	cache_unregister_net(cd, net);
1940 	cache_destroy_net(cd, net);
1941 }
1942 
1943 static int rsc_cache_create_net(struct net *net)
1944 {
1945 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1946 	struct cache_detail *cd;
1947 	int err;
1948 
1949 	cd = cache_create_net(&rsc_cache_template, net);
1950 	if (IS_ERR(cd))
1951 		return PTR_ERR(cd);
1952 	err = cache_register_net(cd, net);
1953 	if (err) {
1954 		cache_destroy_net(cd, net);
1955 		return err;
1956 	}
1957 	sn->rsc_cache = cd;
1958 	return 0;
1959 }
1960 
1961 static void rsc_cache_destroy_net(struct net *net)
1962 {
1963 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1964 	struct cache_detail *cd = sn->rsc_cache;
1965 
1966 	sn->rsc_cache = NULL;
1967 	cache_purge(cd);
1968 	cache_unregister_net(cd, net);
1969 	cache_destroy_net(cd, net);
1970 }
1971 
1972 int
1973 gss_svc_init_net(struct net *net)
1974 {
1975 	int rv;
1976 
1977 	rv = rsc_cache_create_net(net);
1978 	if (rv)
1979 		return rv;
1980 	rv = rsi_cache_create_net(net);
1981 	if (rv)
1982 		goto out1;
1983 	rv = create_use_gss_proxy_proc_entry(net);
1984 	if (rv)
1985 		goto out2;
1986 	return 0;
1987 out2:
1988 	rsi_cache_destroy_net(net);
1989 out1:
1990 	rsc_cache_destroy_net(net);
1991 	return rv;
1992 }
1993 
1994 void
1995 gss_svc_shutdown_net(struct net *net)
1996 {
1997 	destroy_use_gss_proxy_proc_entry(net);
1998 	rsi_cache_destroy_net(net);
1999 	rsc_cache_destroy_net(net);
2000 }
2001 
2002 int
2003 gss_svc_init(void)
2004 {
2005 	return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
2006 }
2007 
2008 void
2009 gss_svc_shutdown(void)
2010 {
2011 	svc_auth_unregister(RPC_AUTH_GSS);
2012 }
2013