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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#include <linux/sunrpc/gss_krb5.h>
53
54#include <trace/events/rpcgss.h>
55
56#include "gss_rpc_upcall.h"
57
58/*
59 * Unfortunately there isn't a maximum checksum size exported via the
60 * GSS API. Manufacture one based on GSS mechanisms supported by this
61 * implementation.
62 */
63#define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN)
64
65/*
66 * This value may be increased in the future to accommodate other
67 * usage of the scratch buffer.
68 */
69#define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE
70
71struct gss_svc_data {
72 /* decoded gss client cred: */
73 struct rpc_gss_wire_cred clcred;
74 /* save a pointer to the beginning of the encoded verifier,
75 * for use in encryption/checksumming in svcauth_gss_release: */
76 __be32 *verf_start;
77 struct rsc *rsci;
78
79 /* for temporary results */
80 u8 gsd_scratch[GSS_SCRATCH_SIZE];
81};
82
83/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
84 * into replies.
85 *
86 * Key is context handle (\x if empty) and gss_token.
87 * Content is major_status minor_status (integers) context_handle, reply_token.
88 *
89 */
90
91static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
92{
93 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
94}
95
96#define RSI_HASHBITS 6
97#define RSI_HASHMAX (1<<RSI_HASHBITS)
98
99struct rsi {
100 struct cache_head h;
101 struct xdr_netobj in_handle, in_token;
102 struct xdr_netobj out_handle, out_token;
103 int major_status, minor_status;
104 struct rcu_head rcu_head;
105};
106
107static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
108static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
109
110static void rsi_free(struct rsi *rsii)
111{
112 kfree(rsii->in_handle.data);
113 kfree(rsii->in_token.data);
114 kfree(rsii->out_handle.data);
115 kfree(rsii->out_token.data);
116}
117
118static void rsi_free_rcu(struct rcu_head *head)
119{
120 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
121
122 rsi_free(rsii);
123 kfree(rsii);
124}
125
126static void rsi_put(struct kref *ref)
127{
128 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
129
130 call_rcu(&rsii->rcu_head, rsi_free_rcu);
131}
132
133static inline int rsi_hash(struct rsi *item)
134{
135 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
136 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
137}
138
139static int rsi_match(struct cache_head *a, struct cache_head *b)
140{
141 struct rsi *item = container_of(a, struct rsi, h);
142 struct rsi *tmp = container_of(b, struct rsi, h);
143 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
144 netobj_equal(&item->in_token, &tmp->in_token);
145}
146
147static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
148{
149 dst->len = len;
150 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
151 if (len && !dst->data)
152 return -ENOMEM;
153 return 0;
154}
155
156static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
157{
158 return dup_to_netobj(dst, src->data, src->len);
159}
160
161static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
162{
163 struct rsi *new = container_of(cnew, struct rsi, h);
164 struct rsi *item = container_of(citem, struct rsi, h);
165
166 new->out_handle.data = NULL;
167 new->out_handle.len = 0;
168 new->out_token.data = NULL;
169 new->out_token.len = 0;
170 new->in_handle.len = item->in_handle.len;
171 item->in_handle.len = 0;
172 new->in_token.len = item->in_token.len;
173 item->in_token.len = 0;
174 new->in_handle.data = item->in_handle.data;
175 item->in_handle.data = NULL;
176 new->in_token.data = item->in_token.data;
177 item->in_token.data = NULL;
178}
179
180static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
181{
182 struct rsi *new = container_of(cnew, struct rsi, h);
183 struct rsi *item = container_of(citem, struct rsi, h);
184
185 BUG_ON(new->out_handle.data || new->out_token.data);
186 new->out_handle.len = item->out_handle.len;
187 item->out_handle.len = 0;
188 new->out_token.len = item->out_token.len;
189 item->out_token.len = 0;
190 new->out_handle.data = item->out_handle.data;
191 item->out_handle.data = NULL;
192 new->out_token.data = item->out_token.data;
193 item->out_token.data = NULL;
194
195 new->major_status = item->major_status;
196 new->minor_status = item->minor_status;
197}
198
199static struct cache_head *rsi_alloc(void)
200{
201 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
202 if (rsii)
203 return &rsii->h;
204 else
205 return NULL;
206}
207
208static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
209{
210 return sunrpc_cache_pipe_upcall_timeout(cd, h);
211}
212
213static void rsi_request(struct cache_detail *cd,
214 struct cache_head *h,
215 char **bpp, int *blen)
216{
217 struct rsi *rsii = container_of(h, struct rsi, h);
218
219 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
220 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
221 (*bpp)[-1] = '\n';
222 WARN_ONCE(*blen < 0,
223 "RPCSEC/GSS credential too large - please use gssproxy\n");
224}
225
226static int rsi_parse(struct cache_detail *cd,
227 char *mesg, int mlen)
228{
229 /* context token expiry major minor context token */
230 char *buf = mesg;
231 char *ep;
232 int len;
233 struct rsi rsii, *rsip = NULL;
234 time64_t expiry;
235 int status = -EINVAL;
236
237 memset(&rsii, 0, sizeof(rsii));
238 /* handle */
239 len = qword_get(&mesg, buf, mlen);
240 if (len < 0)
241 goto out;
242 status = -ENOMEM;
243 if (dup_to_netobj(&rsii.in_handle, buf, len))
244 goto out;
245
246 /* token */
247 len = qword_get(&mesg, buf, mlen);
248 status = -EINVAL;
249 if (len < 0)
250 goto out;
251 status = -ENOMEM;
252 if (dup_to_netobj(&rsii.in_token, buf, len))
253 goto out;
254
255 rsip = rsi_lookup(cd, &rsii);
256 if (!rsip)
257 goto out;
258
259 rsii.h.flags = 0;
260 /* expiry */
261 expiry = get_expiry(&mesg);
262 status = -EINVAL;
263 if (expiry == 0)
264 goto out;
265
266 /* major/minor */
267 len = qword_get(&mesg, buf, mlen);
268 if (len <= 0)
269 goto out;
270 rsii.major_status = simple_strtoul(buf, &ep, 10);
271 if (*ep)
272 goto out;
273 len = qword_get(&mesg, buf, mlen);
274 if (len <= 0)
275 goto out;
276 rsii.minor_status = simple_strtoul(buf, &ep, 10);
277 if (*ep)
278 goto out;
279
280 /* out_handle */
281 len = qword_get(&mesg, buf, mlen);
282 if (len < 0)
283 goto out;
284 status = -ENOMEM;
285 if (dup_to_netobj(&rsii.out_handle, buf, len))
286 goto out;
287
288 /* out_token */
289 len = qword_get(&mesg, buf, mlen);
290 status = -EINVAL;
291 if (len < 0)
292 goto out;
293 status = -ENOMEM;
294 if (dup_to_netobj(&rsii.out_token, buf, len))
295 goto out;
296 rsii.h.expiry_time = expiry;
297 rsip = rsi_update(cd, &rsii, rsip);
298 status = 0;
299out:
300 rsi_free(&rsii);
301 if (rsip)
302 cache_put(&rsip->h, cd);
303 else
304 status = -ENOMEM;
305 return status;
306}
307
308static const struct cache_detail rsi_cache_template = {
309 .owner = THIS_MODULE,
310 .hash_size = RSI_HASHMAX,
311 .name = "auth.rpcsec.init",
312 .cache_put = rsi_put,
313 .cache_upcall = rsi_upcall,
314 .cache_request = rsi_request,
315 .cache_parse = rsi_parse,
316 .match = rsi_match,
317 .init = rsi_init,
318 .update = update_rsi,
319 .alloc = rsi_alloc,
320};
321
322static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
323{
324 struct cache_head *ch;
325 int hash = rsi_hash(item);
326
327 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
328 if (ch)
329 return container_of(ch, struct rsi, h);
330 else
331 return NULL;
332}
333
334static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
335{
336 struct cache_head *ch;
337 int hash = rsi_hash(new);
338
339 ch = sunrpc_cache_update(cd, &new->h,
340 &old->h, hash);
341 if (ch)
342 return container_of(ch, struct rsi, h);
343 else
344 return NULL;
345}
346
347
348/*
349 * The rpcsec_context cache is used to store a context that is
350 * used in data exchange.
351 * The key is a context handle. The content is:
352 * uid, gidlist, mechanism, service-set, mech-specific-data
353 */
354
355#define RSC_HASHBITS 10
356#define RSC_HASHMAX (1<<RSC_HASHBITS)
357
358#define GSS_SEQ_WIN 128
359
360struct gss_svc_seq_data {
361 /* highest seq number seen so far: */
362 u32 sd_max;
363 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
364 * sd_win is nonzero iff sequence number i has been seen already: */
365 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
366 spinlock_t sd_lock;
367};
368
369struct rsc {
370 struct cache_head h;
371 struct xdr_netobj handle;
372 struct svc_cred cred;
373 struct gss_svc_seq_data seqdata;
374 struct gss_ctx *mechctx;
375 struct rcu_head rcu_head;
376};
377
378static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
379static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
380
381static void rsc_free(struct rsc *rsci)
382{
383 kfree(rsci->handle.data);
384 if (rsci->mechctx)
385 gss_delete_sec_context(&rsci->mechctx);
386 free_svc_cred(&rsci->cred);
387}
388
389static void rsc_free_rcu(struct rcu_head *head)
390{
391 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
392
393 kfree(rsci->handle.data);
394 kfree(rsci);
395}
396
397static void rsc_put(struct kref *ref)
398{
399 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
400
401 if (rsci->mechctx)
402 gss_delete_sec_context(&rsci->mechctx);
403 free_svc_cred(&rsci->cred);
404 call_rcu(&rsci->rcu_head, rsc_free_rcu);
405}
406
407static inline int
408rsc_hash(struct rsc *rsci)
409{
410 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
411}
412
413static int
414rsc_match(struct cache_head *a, struct cache_head *b)
415{
416 struct rsc *new = container_of(a, struct rsc, h);
417 struct rsc *tmp = container_of(b, struct rsc, h);
418
419 return netobj_equal(&new->handle, &tmp->handle);
420}
421
422static void
423rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
424{
425 struct rsc *new = container_of(cnew, struct rsc, h);
426 struct rsc *tmp = container_of(ctmp, struct rsc, h);
427
428 new->handle.len = tmp->handle.len;
429 tmp->handle.len = 0;
430 new->handle.data = tmp->handle.data;
431 tmp->handle.data = NULL;
432 new->mechctx = NULL;
433 init_svc_cred(&new->cred);
434}
435
436static void
437update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
438{
439 struct rsc *new = container_of(cnew, struct rsc, h);
440 struct rsc *tmp = container_of(ctmp, struct rsc, h);
441
442 new->mechctx = tmp->mechctx;
443 tmp->mechctx = NULL;
444 memset(&new->seqdata, 0, sizeof(new->seqdata));
445 spin_lock_init(&new->seqdata.sd_lock);
446 new->cred = tmp->cred;
447 init_svc_cred(&tmp->cred);
448}
449
450static struct cache_head *
451rsc_alloc(void)
452{
453 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
454 if (rsci)
455 return &rsci->h;
456 else
457 return NULL;
458}
459
460static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
461{
462 return -EINVAL;
463}
464
465static int rsc_parse(struct cache_detail *cd,
466 char *mesg, int mlen)
467{
468 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
469 char *buf = mesg;
470 int id;
471 int len, rv;
472 struct rsc rsci, *rscp = NULL;
473 time64_t expiry;
474 int status = -EINVAL;
475 struct gss_api_mech *gm = NULL;
476
477 memset(&rsci, 0, sizeof(rsci));
478 /* context handle */
479 len = qword_get(&mesg, buf, mlen);
480 if (len < 0) goto out;
481 status = -ENOMEM;
482 if (dup_to_netobj(&rsci.handle, buf, len))
483 goto out;
484
485 rsci.h.flags = 0;
486 /* expiry */
487 expiry = get_expiry(&mesg);
488 status = -EINVAL;
489 if (expiry == 0)
490 goto out;
491
492 rscp = rsc_lookup(cd, &rsci);
493 if (!rscp)
494 goto out;
495
496 /* uid, or NEGATIVE */
497 rv = get_int(&mesg, &id);
498 if (rv == -EINVAL)
499 goto out;
500 if (rv == -ENOENT)
501 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
502 else {
503 int N, i;
504
505 /*
506 * NOTE: we skip uid_valid()/gid_valid() checks here:
507 * instead, * -1 id's are later mapped to the
508 * (export-specific) anonymous id by nfsd_setuser.
509 *
510 * (But supplementary gid's get no such special
511 * treatment so are checked for validity here.)
512 */
513 /* uid */
514 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
515
516 /* gid */
517 if (get_int(&mesg, &id))
518 goto out;
519 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
520
521 /* number of additional gid's */
522 if (get_int(&mesg, &N))
523 goto out;
524 if (N < 0 || N > NGROUPS_MAX)
525 goto out;
526 status = -ENOMEM;
527 rsci.cred.cr_group_info = groups_alloc(N);
528 if (rsci.cred.cr_group_info == NULL)
529 goto out;
530
531 /* gid's */
532 status = -EINVAL;
533 for (i=0; i<N; i++) {
534 kgid_t kgid;
535 if (get_int(&mesg, &id))
536 goto out;
537 kgid = make_kgid(current_user_ns(), id);
538 if (!gid_valid(kgid))
539 goto out;
540 rsci.cred.cr_group_info->gid[i] = kgid;
541 }
542 groups_sort(rsci.cred.cr_group_info);
543
544 /* mech name */
545 len = qword_get(&mesg, buf, mlen);
546 if (len < 0)
547 goto out;
548 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
549 status = -EOPNOTSUPP;
550 if (!gm)
551 goto out;
552
553 status = -EINVAL;
554 /* mech-specific data: */
555 len = qword_get(&mesg, buf, mlen);
556 if (len < 0)
557 goto out;
558 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
559 NULL, GFP_KERNEL);
560 if (status)
561 goto out;
562
563 /* get client name */
564 len = qword_get(&mesg, buf, mlen);
565 if (len > 0) {
566 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
567 if (!rsci.cred.cr_principal) {
568 status = -ENOMEM;
569 goto out;
570 }
571 }
572
573 }
574 rsci.h.expiry_time = expiry;
575 rscp = rsc_update(cd, &rsci, rscp);
576 status = 0;
577out:
578 rsc_free(&rsci);
579 if (rscp)
580 cache_put(&rscp->h, cd);
581 else
582 status = -ENOMEM;
583 return status;
584}
585
586static const struct cache_detail rsc_cache_template = {
587 .owner = THIS_MODULE,
588 .hash_size = RSC_HASHMAX,
589 .name = "auth.rpcsec.context",
590 .cache_put = rsc_put,
591 .cache_upcall = rsc_upcall,
592 .cache_parse = rsc_parse,
593 .match = rsc_match,
594 .init = rsc_init,
595 .update = update_rsc,
596 .alloc = rsc_alloc,
597};
598
599static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
600{
601 struct cache_head *ch;
602 int hash = rsc_hash(item);
603
604 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
605 if (ch)
606 return container_of(ch, struct rsc, h);
607 else
608 return NULL;
609}
610
611static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
612{
613 struct cache_head *ch;
614 int hash = rsc_hash(new);
615
616 ch = sunrpc_cache_update(cd, &new->h,
617 &old->h, hash);
618 if (ch)
619 return container_of(ch, struct rsc, h);
620 else
621 return NULL;
622}
623
624
625static struct rsc *
626gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
627{
628 struct rsc rsci;
629 struct rsc *found;
630
631 memset(&rsci, 0, sizeof(rsci));
632 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
633 return NULL;
634 found = rsc_lookup(cd, &rsci);
635 rsc_free(&rsci);
636 if (!found)
637 return NULL;
638 if (cache_check(cd, &found->h, NULL))
639 return NULL;
640 return found;
641}
642
643/**
644 * gss_check_seq_num - GSS sequence number window check
645 * @rqstp: RPC Call to use when reporting errors
646 * @rsci: cached GSS context state (updated on return)
647 * @seq_num: sequence number to check
648 *
649 * Implements sequence number algorithm as specified in
650 * RFC 2203, Section 5.3.3.1. "Context Management".
651 *
652 * Return values:
653 * %true: @rqstp's GSS sequence number is inside the window
654 * %false: @rqstp's GSS sequence number is outside the window
655 */
656static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
657 u32 seq_num)
658{
659 struct gss_svc_seq_data *sd = &rsci->seqdata;
660 bool result = false;
661
662 spin_lock(&sd->sd_lock);
663 if (seq_num > sd->sd_max) {
664 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
665 memset(sd->sd_win, 0, sizeof(sd->sd_win));
666 sd->sd_max = seq_num;
667 } else while (sd->sd_max < seq_num) {
668 sd->sd_max++;
669 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
670 }
671 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
672 goto ok;
673 } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
674 goto toolow;
675 }
676 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
677 goto alreadyseen;
678
679ok:
680 result = true;
681out:
682 spin_unlock(&sd->sd_lock);
683 return result;
684
685toolow:
686 trace_rpcgss_svc_seqno_low(rqstp, seq_num,
687 sd->sd_max - GSS_SEQ_WIN,
688 sd->sd_max);
689 goto out;
690alreadyseen:
691 trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
692 goto out;
693}
694
695static inline u32 round_up_to_quad(u32 i)
696{
697 return (i + 3 ) & ~3;
698}
699
700static inline int
701svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
702{
703 int l;
704
705 if (argv->iov_len < 4)
706 return -1;
707 o->len = svc_getnl(argv);
708 l = round_up_to_quad(o->len);
709 if (argv->iov_len < l)
710 return -1;
711 o->data = argv->iov_base;
712 argv->iov_base += l;
713 argv->iov_len -= l;
714 return 0;
715}
716
717static inline int
718svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
719{
720 u8 *p;
721
722 if (resv->iov_len + 4 > PAGE_SIZE)
723 return -1;
724 svc_putnl(resv, o->len);
725 p = resv->iov_base + resv->iov_len;
726 resv->iov_len += round_up_to_quad(o->len);
727 if (resv->iov_len > PAGE_SIZE)
728 return -1;
729 memcpy(p, o->data, o->len);
730 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
731 return 0;
732}
733
734/*
735 * Verify the checksum on the header and return SVC_OK on success.
736 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
737 * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat.
738 */
739static int
740gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
741 __be32 *rpcstart, struct rpc_gss_wire_cred *gc)
742{
743 struct gss_ctx *ctx_id = rsci->mechctx;
744 struct xdr_buf rpchdr;
745 struct xdr_netobj checksum;
746 u32 flavor = 0;
747 struct kvec *argv = &rqstp->rq_arg.head[0];
748 struct kvec iov;
749
750 /* data to compute the checksum over: */
751 iov.iov_base = rpcstart;
752 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
753 xdr_buf_from_iov(&iov, &rpchdr);
754
755 rqstp->rq_auth_stat = rpc_autherr_badverf;
756 if (argv->iov_len < 4)
757 return SVC_DENIED;
758 flavor = svc_getnl(argv);
759 if (flavor != RPC_AUTH_GSS)
760 return SVC_DENIED;
761 if (svc_safe_getnetobj(argv, &checksum))
762 return SVC_DENIED;
763
764 if (rqstp->rq_deferred) /* skip verification of revisited request */
765 return SVC_OK;
766 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
767 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
768 return SVC_DENIED;
769 }
770
771 if (gc->gc_seq > MAXSEQ) {
772 trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
773 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
774 return SVC_DENIED;
775 }
776 if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
777 return SVC_DROP;
778 return SVC_OK;
779}
780
781static int
782gss_write_null_verf(struct svc_rqst *rqstp)
783{
784 __be32 *p;
785
786 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
787 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
788 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
789 *p++ = 0;
790 if (!xdr_ressize_check(rqstp, p))
791 return -1;
792 return 0;
793}
794
795static int
796gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
797{
798 __be32 *xdr_seq;
799 u32 maj_stat;
800 struct xdr_buf verf_data;
801 struct xdr_netobj mic;
802 __be32 *p;
803 struct kvec iov;
804 int err = -1;
805
806 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
807 xdr_seq = kmalloc(4, GFP_KERNEL);
808 if (!xdr_seq)
809 return -ENOMEM;
810 *xdr_seq = htonl(seq);
811
812 iov.iov_base = xdr_seq;
813 iov.iov_len = 4;
814 xdr_buf_from_iov(&iov, &verf_data);
815 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
816 mic.data = (u8 *)(p + 1);
817 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
818 if (maj_stat != GSS_S_COMPLETE)
819 goto out;
820 *p++ = htonl(mic.len);
821 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
822 p += XDR_QUADLEN(mic.len);
823 if (!xdr_ressize_check(rqstp, p))
824 goto out;
825 err = 0;
826out:
827 kfree(xdr_seq);
828 return err;
829}
830
831struct gss_domain {
832 struct auth_domain h;
833 u32 pseudoflavor;
834};
835
836static struct auth_domain *
837find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
838{
839 char *name;
840
841 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
842 if (!name)
843 return NULL;
844 return auth_domain_find(name);
845}
846
847static struct auth_ops svcauthops_gss;
848
849u32 svcauth_gss_flavor(struct auth_domain *dom)
850{
851 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
852
853 return gd->pseudoflavor;
854}
855
856EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
857
858struct auth_domain *
859svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
860{
861 struct gss_domain *new;
862 struct auth_domain *test;
863 int stat = -ENOMEM;
864
865 new = kmalloc(sizeof(*new), GFP_KERNEL);
866 if (!new)
867 goto out;
868 kref_init(&new->h.ref);
869 new->h.name = kstrdup(name, GFP_KERNEL);
870 if (!new->h.name)
871 goto out_free_dom;
872 new->h.flavour = &svcauthops_gss;
873 new->pseudoflavor = pseudoflavor;
874
875 test = auth_domain_lookup(name, &new->h);
876 if (test != &new->h) {
877 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
878 name);
879 stat = -EADDRINUSE;
880 auth_domain_put(test);
881 goto out_free_name;
882 }
883 return test;
884
885out_free_name:
886 kfree(new->h.name);
887out_free_dom:
888 kfree(new);
889out:
890 return ERR_PTR(stat);
891}
892EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
893
894static inline int
895read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
896{
897 __be32 raw;
898 int status;
899
900 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
901 if (status)
902 return status;
903 *obj = ntohl(raw);
904 return 0;
905}
906
907/* It would be nice if this bit of code could be shared with the client.
908 * Obstacles:
909 * The client shouldn't malloc(), would have to pass in own memory.
910 * The server uses base of head iovec as read pointer, while the
911 * client uses separate pointer. */
912static int
913unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
914{
915 struct gss_svc_data *gsd = rqstp->rq_auth_data;
916 u32 integ_len, rseqno, maj_stat;
917 struct xdr_netobj mic;
918 struct xdr_buf integ_buf;
919
920 /* NFS READ normally uses splice to send data in-place. However
921 * the data in cache can change after the reply's MIC is computed
922 * but before the RPC reply is sent. To prevent the client from
923 * rejecting the server-computed MIC in this somewhat rare case,
924 * do not use splice with the GSS integrity service.
925 */
926 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
927
928 /* Did we already verify the signature on the original pass through? */
929 if (rqstp->rq_deferred)
930 return 0;
931
932 integ_len = svc_getnl(&buf->head[0]);
933 if (integ_len & 3)
934 goto unwrap_failed;
935 if (integ_len > buf->len)
936 goto unwrap_failed;
937 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
938 goto unwrap_failed;
939
940 /* copy out mic... */
941 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
942 goto unwrap_failed;
943 if (mic.len > sizeof(gsd->gsd_scratch))
944 goto unwrap_failed;
945 mic.data = gsd->gsd_scratch;
946 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
947 goto unwrap_failed;
948 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
949 if (maj_stat != GSS_S_COMPLETE)
950 goto bad_mic;
951 rseqno = svc_getnl(&buf->head[0]);
952 if (rseqno != seq)
953 goto bad_seqno;
954 /* trim off the mic and padding at the end before returning */
955 xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
956 return 0;
957
958unwrap_failed:
959 trace_rpcgss_svc_unwrap_failed(rqstp);
960 return -EINVAL;
961bad_seqno:
962 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
963 return -EINVAL;
964bad_mic:
965 trace_rpcgss_svc_mic(rqstp, maj_stat);
966 return -EINVAL;
967}
968
969static inline int
970total_buf_len(struct xdr_buf *buf)
971{
972 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
973}
974
975static void
976fix_priv_head(struct xdr_buf *buf, int pad)
977{
978 if (buf->page_len == 0) {
979 /* We need to adjust head and buf->len in tandem in this
980 * case to make svc_defer() work--it finds the original
981 * buffer start using buf->len - buf->head[0].iov_len. */
982 buf->head[0].iov_len -= pad;
983 }
984}
985
986static int
987unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
988{
989 u32 priv_len, maj_stat;
990 int pad, remaining_len, offset;
991 u32 rseqno;
992
993 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
994
995 priv_len = svc_getnl(&buf->head[0]);
996 if (rqstp->rq_deferred) {
997 /* Already decrypted last time through! The sequence number
998 * check at out_seq is unnecessary but harmless: */
999 goto out_seq;
1000 }
1001 /* buf->len is the number of bytes from the original start of the
1002 * request to the end, where head[0].iov_len is just the bytes
1003 * not yet read from the head, so these two values are different: */
1004 remaining_len = total_buf_len(buf);
1005 if (priv_len > remaining_len)
1006 goto unwrap_failed;
1007 pad = remaining_len - priv_len;
1008 buf->len -= pad;
1009 fix_priv_head(buf, pad);
1010
1011 maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
1012 pad = priv_len - buf->len;
1013 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
1014 * In the krb5p case, at least, the data ends up offset, so we need to
1015 * move it around. */
1016 /* XXX: This is very inefficient. It would be better to either do
1017 * this while we encrypt, or maybe in the receive code, if we can peak
1018 * ahead and work out the service and mechanism there. */
1019 offset = xdr_pad_size(buf->head[0].iov_len);
1020 if (offset) {
1021 buf->buflen = RPCSVC_MAXPAYLOAD;
1022 xdr_shift_buf(buf, offset);
1023 fix_priv_head(buf, pad);
1024 }
1025 if (maj_stat != GSS_S_COMPLETE)
1026 goto bad_unwrap;
1027out_seq:
1028 rseqno = svc_getnl(&buf->head[0]);
1029 if (rseqno != seq)
1030 goto bad_seqno;
1031 return 0;
1032
1033unwrap_failed:
1034 trace_rpcgss_svc_unwrap_failed(rqstp);
1035 return -EINVAL;
1036bad_seqno:
1037 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
1038 return -EINVAL;
1039bad_unwrap:
1040 trace_rpcgss_svc_unwrap(rqstp, maj_stat);
1041 return -EINVAL;
1042}
1043
1044static int
1045svcauth_gss_set_client(struct svc_rqst *rqstp)
1046{
1047 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1048 struct rsc *rsci = svcdata->rsci;
1049 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
1050 int stat;
1051
1052 rqstp->rq_auth_stat = rpc_autherr_badcred;
1053
1054 /*
1055 * A gss export can be specified either by:
1056 * export *(sec=krb5,rw)
1057 * or by
1058 * export gss/krb5(rw)
1059 * The latter is deprecated; but for backwards compatibility reasons
1060 * the nfsd code will still fall back on trying it if the former
1061 * doesn't work; so we try to make both available to nfsd, below.
1062 */
1063 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1064 if (rqstp->rq_gssclient == NULL)
1065 return SVC_DENIED;
1066 stat = svcauth_unix_set_client(rqstp);
1067 if (stat == SVC_DROP || stat == SVC_CLOSE)
1068 return stat;
1069
1070 rqstp->rq_auth_stat = rpc_auth_ok;
1071 return SVC_OK;
1072}
1073
1074static inline int
1075gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1076 struct xdr_netobj *out_handle, int *major_status)
1077{
1078 struct rsc *rsci;
1079 int rc;
1080
1081 if (*major_status != GSS_S_COMPLETE)
1082 return gss_write_null_verf(rqstp);
1083 rsci = gss_svc_searchbyctx(cd, out_handle);
1084 if (rsci == NULL) {
1085 *major_status = GSS_S_NO_CONTEXT;
1086 return gss_write_null_verf(rqstp);
1087 }
1088 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1089 cache_put(&rsci->h, cd);
1090 return rc;
1091}
1092
1093static inline int
1094gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1095 struct kvec *argv, __be32 *authp,
1096 struct xdr_netobj *in_handle)
1097{
1098 /* Read the verifier; should be NULL: */
1099 *authp = rpc_autherr_badverf;
1100 if (argv->iov_len < 2 * 4)
1101 return SVC_DENIED;
1102 if (svc_getnl(argv) != RPC_AUTH_NULL)
1103 return SVC_DENIED;
1104 if (svc_getnl(argv) != 0)
1105 return SVC_DENIED;
1106 /* Martial context handle and token for upcall: */
1107 *authp = rpc_autherr_badcred;
1108 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1109 return SVC_DENIED;
1110 if (dup_netobj(in_handle, &gc->gc_ctx))
1111 return SVC_CLOSE;
1112 *authp = rpc_autherr_badverf;
1113
1114 return 0;
1115}
1116
1117static inline int
1118gss_read_verf(struct rpc_gss_wire_cred *gc,
1119 struct kvec *argv, __be32 *authp,
1120 struct xdr_netobj *in_handle,
1121 struct xdr_netobj *in_token)
1122{
1123 struct xdr_netobj tmpobj;
1124 int res;
1125
1126 res = gss_read_common_verf(gc, argv, authp, in_handle);
1127 if (res)
1128 return res;
1129
1130 if (svc_safe_getnetobj(argv, &tmpobj)) {
1131 kfree(in_handle->data);
1132 return SVC_DENIED;
1133 }
1134 if (dup_netobj(in_token, &tmpobj)) {
1135 kfree(in_handle->data);
1136 return SVC_CLOSE;
1137 }
1138
1139 return 0;
1140}
1141
1142static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1143{
1144 u32 inlen;
1145 int i;
1146
1147 i = 0;
1148 inlen = in_token->page_len;
1149 while (inlen) {
1150 if (in_token->pages[i])
1151 put_page(in_token->pages[i]);
1152 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1153 }
1154
1155 kfree(in_token->pages);
1156 in_token->pages = NULL;
1157}
1158
1159static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1160 struct rpc_gss_wire_cred *gc,
1161 struct xdr_netobj *in_handle,
1162 struct gssp_in_token *in_token)
1163{
1164 struct kvec *argv = &rqstp->rq_arg.head[0];
1165 unsigned int length, pgto_offs, pgfrom_offs;
1166 int pages, i, res, pgto, pgfrom;
1167 size_t inlen, to_offs, from_offs;
1168
1169 res = gss_read_common_verf(gc, argv, &rqstp->rq_auth_stat, in_handle);
1170 if (res)
1171 return res;
1172
1173 inlen = svc_getnl(argv);
1174 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) {
1175 kfree(in_handle->data);
1176 return SVC_DENIED;
1177 }
1178
1179 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1180 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1181 if (!in_token->pages) {
1182 kfree(in_handle->data);
1183 return SVC_DENIED;
1184 }
1185 in_token->page_base = 0;
1186 in_token->page_len = inlen;
1187 for (i = 0; i < pages; i++) {
1188 in_token->pages[i] = alloc_page(GFP_KERNEL);
1189 if (!in_token->pages[i]) {
1190 kfree(in_handle->data);
1191 gss_free_in_token_pages(in_token);
1192 return SVC_DENIED;
1193 }
1194 }
1195
1196 length = min_t(unsigned int, inlen, argv->iov_len);
1197 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1198 inlen -= length;
1199
1200 to_offs = length;
1201 from_offs = rqstp->rq_arg.page_base;
1202 while (inlen) {
1203 pgto = to_offs >> PAGE_SHIFT;
1204 pgfrom = from_offs >> PAGE_SHIFT;
1205 pgto_offs = to_offs & ~PAGE_MASK;
1206 pgfrom_offs = from_offs & ~PAGE_MASK;
1207
1208 length = min_t(unsigned int, inlen,
1209 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1210 PAGE_SIZE - pgfrom_offs));
1211 memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1212 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1213 length);
1214
1215 to_offs += length;
1216 from_offs += length;
1217 inlen -= length;
1218 }
1219 return 0;
1220}
1221
1222static inline int
1223gss_write_resv(struct kvec *resv, size_t size_limit,
1224 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1225 int major_status, int minor_status)
1226{
1227 if (resv->iov_len + 4 > size_limit)
1228 return -1;
1229 svc_putnl(resv, RPC_SUCCESS);
1230 if (svc_safe_putnetobj(resv, out_handle))
1231 return -1;
1232 if (resv->iov_len + 3 * 4 > size_limit)
1233 return -1;
1234 svc_putnl(resv, major_status);
1235 svc_putnl(resv, minor_status);
1236 svc_putnl(resv, GSS_SEQ_WIN);
1237 if (svc_safe_putnetobj(resv, out_token))
1238 return -1;
1239 return 0;
1240}
1241
1242/*
1243 * Having read the cred already and found we're in the context
1244 * initiation case, read the verifier and initiate (or check the results
1245 * of) upcalls to userspace for help with context initiation. If
1246 * the upcall results are available, write the verifier and result.
1247 * Otherwise, drop the request pending an answer to the upcall.
1248 */
1249static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1250 struct rpc_gss_wire_cred *gc)
1251{
1252 struct kvec *argv = &rqstp->rq_arg.head[0];
1253 struct kvec *resv = &rqstp->rq_res.head[0];
1254 struct rsi *rsip, rsikey;
1255 int ret;
1256 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1257
1258 memset(&rsikey, 0, sizeof(rsikey));
1259 ret = gss_read_verf(gc, argv, &rqstp->rq_auth_stat,
1260 &rsikey.in_handle, &rsikey.in_token);
1261 if (ret)
1262 return ret;
1263
1264 /* Perform upcall, or find upcall result: */
1265 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1266 rsi_free(&rsikey);
1267 if (!rsip)
1268 return SVC_CLOSE;
1269 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1270 /* No upcall result: */
1271 return SVC_CLOSE;
1272
1273 ret = SVC_CLOSE;
1274 /* Got an answer to the upcall; use it: */
1275 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1276 &rsip->out_handle, &rsip->major_status))
1277 goto out;
1278 if (gss_write_resv(resv, PAGE_SIZE,
1279 &rsip->out_handle, &rsip->out_token,
1280 rsip->major_status, rsip->minor_status))
1281 goto out;
1282
1283 ret = SVC_COMPLETE;
1284out:
1285 cache_put(&rsip->h, sn->rsi_cache);
1286 return ret;
1287}
1288
1289static int gss_proxy_save_rsc(struct cache_detail *cd,
1290 struct gssp_upcall_data *ud,
1291 uint64_t *handle)
1292{
1293 struct rsc rsci, *rscp = NULL;
1294 static atomic64_t ctxhctr;
1295 long long ctxh;
1296 struct gss_api_mech *gm = NULL;
1297 time64_t expiry;
1298 int status;
1299
1300 memset(&rsci, 0, sizeof(rsci));
1301 /* context handle */
1302 status = -ENOMEM;
1303 /* the handle needs to be just a unique id,
1304 * use a static counter */
1305 ctxh = atomic64_inc_return(&ctxhctr);
1306
1307 /* make a copy for the caller */
1308 *handle = ctxh;
1309
1310 /* make a copy for the rsc cache */
1311 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1312 goto out;
1313 rscp = rsc_lookup(cd, &rsci);
1314 if (!rscp)
1315 goto out;
1316
1317 /* creds */
1318 if (!ud->found_creds) {
1319 /* userspace seem buggy, we should always get at least a
1320 * mapping to nobody */
1321 goto out;
1322 } else {
1323 struct timespec64 boot;
1324
1325 /* steal creds */
1326 rsci.cred = ud->creds;
1327 memset(&ud->creds, 0, sizeof(struct svc_cred));
1328
1329 status = -EOPNOTSUPP;
1330 /* get mech handle from OID */
1331 gm = gss_mech_get_by_OID(&ud->mech_oid);
1332 if (!gm)
1333 goto out;
1334 rsci.cred.cr_gss_mech = gm;
1335
1336 status = -EINVAL;
1337 /* mech-specific data: */
1338 status = gss_import_sec_context(ud->out_handle.data,
1339 ud->out_handle.len,
1340 gm, &rsci.mechctx,
1341 &expiry, GFP_KERNEL);
1342 if (status)
1343 goto out;
1344
1345 getboottime64(&boot);
1346 expiry -= boot.tv_sec;
1347 }
1348
1349 rsci.h.expiry_time = expiry;
1350 rscp = rsc_update(cd, &rsci, rscp);
1351 status = 0;
1352out:
1353 rsc_free(&rsci);
1354 if (rscp)
1355 cache_put(&rscp->h, cd);
1356 else
1357 status = -ENOMEM;
1358 return status;
1359}
1360
1361static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1362 struct rpc_gss_wire_cred *gc)
1363{
1364 struct kvec *resv = &rqstp->rq_res.head[0];
1365 struct xdr_netobj cli_handle;
1366 struct gssp_upcall_data ud;
1367 uint64_t handle;
1368 int status;
1369 int ret;
1370 struct net *net = SVC_NET(rqstp);
1371 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1372
1373 memset(&ud, 0, sizeof(ud));
1374 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
1375 if (ret)
1376 return ret;
1377
1378 ret = SVC_CLOSE;
1379
1380 /* Perform synchronous upcall to gss-proxy */
1381 status = gssp_accept_sec_context_upcall(net, &ud);
1382 if (status)
1383 goto out;
1384
1385 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1386
1387 switch (ud.major_status) {
1388 case GSS_S_CONTINUE_NEEDED:
1389 cli_handle = ud.out_handle;
1390 break;
1391 case GSS_S_COMPLETE:
1392 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1393 if (status)
1394 goto out;
1395 cli_handle.data = (u8 *)&handle;
1396 cli_handle.len = sizeof(handle);
1397 break;
1398 default:
1399 goto out;
1400 }
1401
1402 /* Got an answer to the upcall; use it: */
1403 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1404 &cli_handle, &ud.major_status))
1405 goto out;
1406 if (gss_write_resv(resv, PAGE_SIZE,
1407 &cli_handle, &ud.out_token,
1408 ud.major_status, ud.minor_status))
1409 goto out;
1410
1411 ret = SVC_COMPLETE;
1412out:
1413 gss_free_in_token_pages(&ud.in_token);
1414 gssp_free_upcall_data(&ud);
1415 return ret;
1416}
1417
1418/*
1419 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1420 * it to be changed if it's currently undefined (-1). If it's any other value
1421 * then return -EBUSY unless the type wouldn't have changed anyway.
1422 */
1423static int set_gss_proxy(struct net *net, int type)
1424{
1425 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1426 int ret;
1427
1428 WARN_ON_ONCE(type != 0 && type != 1);
1429 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1430 if (ret != -1 && ret != type)
1431 return -EBUSY;
1432 return 0;
1433}
1434
1435static bool use_gss_proxy(struct net *net)
1436{
1437 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1438
1439 /* If use_gss_proxy is still undefined, then try to disable it */
1440 if (sn->use_gss_proxy == -1)
1441 set_gss_proxy(net, 0);
1442 return sn->use_gss_proxy;
1443}
1444
1445#ifdef CONFIG_PROC_FS
1446
1447static ssize_t write_gssp(struct file *file, const char __user *buf,
1448 size_t count, loff_t *ppos)
1449{
1450 struct net *net = pde_data(file_inode(file));
1451 char tbuf[20];
1452 unsigned long i;
1453 int res;
1454
1455 if (*ppos || count > sizeof(tbuf)-1)
1456 return -EINVAL;
1457 if (copy_from_user(tbuf, buf, count))
1458 return -EFAULT;
1459
1460 tbuf[count] = 0;
1461 res = kstrtoul(tbuf, 0, &i);
1462 if (res)
1463 return res;
1464 if (i != 1)
1465 return -EINVAL;
1466 res = set_gssp_clnt(net);
1467 if (res)
1468 return res;
1469 res = set_gss_proxy(net, 1);
1470 if (res)
1471 return res;
1472 return count;
1473}
1474
1475static ssize_t read_gssp(struct file *file, char __user *buf,
1476 size_t count, loff_t *ppos)
1477{
1478 struct net *net = pde_data(file_inode(file));
1479 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1480 unsigned long p = *ppos;
1481 char tbuf[10];
1482 size_t len;
1483
1484 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1485 len = strlen(tbuf);
1486 if (p >= len)
1487 return 0;
1488 len -= p;
1489 if (len > count)
1490 len = count;
1491 if (copy_to_user(buf, (void *)(tbuf+p), len))
1492 return -EFAULT;
1493 *ppos += len;
1494 return len;
1495}
1496
1497static const struct proc_ops use_gss_proxy_proc_ops = {
1498 .proc_open = nonseekable_open,
1499 .proc_write = write_gssp,
1500 .proc_read = read_gssp,
1501};
1502
1503static int create_use_gss_proxy_proc_entry(struct net *net)
1504{
1505 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1506 struct proc_dir_entry **p = &sn->use_gssp_proc;
1507
1508 sn->use_gss_proxy = -1;
1509 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1510 sn->proc_net_rpc,
1511 &use_gss_proxy_proc_ops, net);
1512 if (!*p)
1513 return -ENOMEM;
1514 init_gssp_clnt(sn);
1515 return 0;
1516}
1517
1518static void destroy_use_gss_proxy_proc_entry(struct net *net)
1519{
1520 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1521
1522 if (sn->use_gssp_proc) {
1523 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1524 clear_gssp_clnt(sn);
1525 }
1526}
1527#else /* CONFIG_PROC_FS */
1528
1529static int create_use_gss_proxy_proc_entry(struct net *net)
1530{
1531 return 0;
1532}
1533
1534static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1535
1536#endif /* CONFIG_PROC_FS */
1537
1538/*
1539 * Accept an rpcsec packet.
1540 * If context establishment, punt to user space
1541 * If data exchange, verify/decrypt
1542 * If context destruction, handle here
1543 * In the context establishment and destruction case we encode
1544 * response here and return SVC_COMPLETE.
1545 */
1546static int
1547svcauth_gss_accept(struct svc_rqst *rqstp)
1548{
1549 struct kvec *argv = &rqstp->rq_arg.head[0];
1550 struct kvec *resv = &rqstp->rq_res.head[0];
1551 u32 crlen;
1552 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1553 struct rpc_gss_wire_cred *gc;
1554 struct rsc *rsci = NULL;
1555 __be32 *rpcstart;
1556 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1557 int ret;
1558 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1559
1560 rqstp->rq_auth_stat = rpc_autherr_badcred;
1561 if (!svcdata)
1562 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1563 if (!svcdata)
1564 goto auth_err;
1565 rqstp->rq_auth_data = svcdata;
1566 svcdata->verf_start = NULL;
1567 svcdata->rsci = NULL;
1568 gc = &svcdata->clcred;
1569
1570 /* start of rpc packet is 7 u32's back from here:
1571 * xid direction rpcversion prog vers proc flavour
1572 */
1573 rpcstart = argv->iov_base;
1574 rpcstart -= 7;
1575
1576 /* credential is:
1577 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1578 * at least 5 u32s, and is preceded by length, so that makes 6.
1579 */
1580
1581 if (argv->iov_len < 5 * 4)
1582 goto auth_err;
1583 crlen = svc_getnl(argv);
1584 if (svc_getnl(argv) != RPC_GSS_VERSION)
1585 goto auth_err;
1586 gc->gc_proc = svc_getnl(argv);
1587 gc->gc_seq = svc_getnl(argv);
1588 gc->gc_svc = svc_getnl(argv);
1589 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1590 goto auth_err;
1591 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1592 goto auth_err;
1593
1594 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1595 goto auth_err;
1596
1597 rqstp->rq_auth_stat = rpc_autherr_badverf;
1598 switch (gc->gc_proc) {
1599 case RPC_GSS_PROC_INIT:
1600 case RPC_GSS_PROC_CONTINUE_INIT:
1601 if (use_gss_proxy(SVC_NET(rqstp)))
1602 return svcauth_gss_proxy_init(rqstp, gc);
1603 else
1604 return svcauth_gss_legacy_init(rqstp, gc);
1605 case RPC_GSS_PROC_DATA:
1606 case RPC_GSS_PROC_DESTROY:
1607 /* Look up the context, and check the verifier: */
1608 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1609 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1610 if (!rsci)
1611 goto auth_err;
1612 switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1613 case SVC_OK:
1614 break;
1615 case SVC_DENIED:
1616 goto auth_err;
1617 case SVC_DROP:
1618 goto drop;
1619 }
1620 break;
1621 default:
1622 rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1623 goto auth_err;
1624 }
1625
1626 /* now act upon the command: */
1627 switch (gc->gc_proc) {
1628 case RPC_GSS_PROC_DESTROY:
1629 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1630 goto auth_err;
1631 /* Delete the entry from the cache_list and call cache_put */
1632 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1633 if (resv->iov_len + 4 > PAGE_SIZE)
1634 goto drop;
1635 svc_putnl(resv, RPC_SUCCESS);
1636 goto complete;
1637 case RPC_GSS_PROC_DATA:
1638 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1639 svcdata->verf_start = resv->iov_base + resv->iov_len;
1640 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1641 goto auth_err;
1642 rqstp->rq_cred = rsci->cred;
1643 get_group_info(rsci->cred.cr_group_info);
1644 rqstp->rq_auth_stat = rpc_autherr_badcred;
1645 switch (gc->gc_svc) {
1646 case RPC_GSS_SVC_NONE:
1647 break;
1648 case RPC_GSS_SVC_INTEGRITY:
1649 /* placeholders for length and seq. number: */
1650 svc_putnl(resv, 0);
1651 svc_putnl(resv, 0);
1652 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1653 gc->gc_seq, rsci->mechctx))
1654 goto garbage_args;
1655 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1656 break;
1657 case RPC_GSS_SVC_PRIVACY:
1658 /* placeholders for length and seq. number: */
1659 svc_putnl(resv, 0);
1660 svc_putnl(resv, 0);
1661 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1662 gc->gc_seq, rsci->mechctx))
1663 goto garbage_args;
1664 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1665 break;
1666 default:
1667 goto auth_err;
1668 }
1669 svcdata->rsci = rsci;
1670 cache_get(&rsci->h);
1671 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1672 rsci->mechctx->mech_type,
1673 GSS_C_QOP_DEFAULT,
1674 gc->gc_svc);
1675 ret = SVC_OK;
1676 trace_rpcgss_svc_authenticate(rqstp, gc);
1677 goto out;
1678 }
1679garbage_args:
1680 ret = SVC_GARBAGE;
1681 goto out;
1682auth_err:
1683 /* Restore write pointer to its original value: */
1684 xdr_ressize_check(rqstp, reject_stat);
1685 ret = SVC_DENIED;
1686 goto out;
1687complete:
1688 ret = SVC_COMPLETE;
1689 goto out;
1690drop:
1691 ret = SVC_CLOSE;
1692out:
1693 if (rsci)
1694 cache_put(&rsci->h, sn->rsc_cache);
1695 return ret;
1696}
1697
1698static __be32 *
1699svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1700{
1701 __be32 *p;
1702 u32 verf_len;
1703
1704 p = gsd->verf_start;
1705 gsd->verf_start = NULL;
1706
1707 /* If the reply stat is nonzero, don't wrap: */
1708 if (*(p-1) != rpc_success)
1709 return NULL;
1710 /* Skip the verifier: */
1711 p += 1;
1712 verf_len = ntohl(*p++);
1713 p += XDR_QUADLEN(verf_len);
1714 /* move accept_stat to right place: */
1715 memcpy(p, p + 2, 4);
1716 /* Also don't wrap if the accept stat is nonzero: */
1717 if (*p != rpc_success) {
1718 resbuf->head[0].iov_len -= 2 * 4;
1719 return NULL;
1720 }
1721 p++;
1722 return p;
1723}
1724
1725static inline int
1726svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1727{
1728 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1729 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1730 struct xdr_buf *resbuf = &rqstp->rq_res;
1731 struct xdr_buf integ_buf;
1732 struct xdr_netobj mic;
1733 struct kvec *resv;
1734 __be32 *p;
1735 int integ_offset, integ_len;
1736 int stat = -EINVAL;
1737
1738 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1739 if (p == NULL)
1740 goto out;
1741 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1742 integ_len = resbuf->len - integ_offset;
1743 if (integ_len & 3)
1744 goto out;
1745 *p++ = htonl(integ_len);
1746 *p++ = htonl(gc->gc_seq);
1747 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1748 WARN_ON_ONCE(1);
1749 goto out_err;
1750 }
1751 if (resbuf->tail[0].iov_base == NULL) {
1752 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1753 goto out_err;
1754 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1755 + resbuf->head[0].iov_len;
1756 resbuf->tail[0].iov_len = 0;
1757 }
1758 resv = &resbuf->tail[0];
1759 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1760 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1761 goto out_err;
1762 svc_putnl(resv, mic.len);
1763 memset(mic.data + mic.len, 0,
1764 round_up_to_quad(mic.len) - mic.len);
1765 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1766 /* not strictly required: */
1767 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1768 if (resv->iov_len > PAGE_SIZE)
1769 goto out_err;
1770out:
1771 stat = 0;
1772out_err:
1773 return stat;
1774}
1775
1776static inline int
1777svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1778{
1779 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1780 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1781 struct xdr_buf *resbuf = &rqstp->rq_res;
1782 struct page **inpages = NULL;
1783 __be32 *p, *len;
1784 int offset;
1785 int pad;
1786
1787 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1788 if (p == NULL)
1789 return 0;
1790 len = p++;
1791 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1792 *p++ = htonl(gc->gc_seq);
1793 inpages = resbuf->pages;
1794 /* XXX: Would be better to write some xdr helper functions for
1795 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1796
1797 /*
1798 * If there is currently tail data, make sure there is
1799 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1800 * the page, and move the current tail data such that
1801 * there is RPC_MAX_AUTH_SIZE slack space available in
1802 * both the head and tail.
1803 */
1804 if (resbuf->tail[0].iov_base) {
1805 if (resbuf->tail[0].iov_base >=
1806 resbuf->head[0].iov_base + PAGE_SIZE)
1807 return -EINVAL;
1808 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1809 return -EINVAL;
1810 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1811 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1812 return -ENOMEM;
1813 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1814 resbuf->tail[0].iov_base,
1815 resbuf->tail[0].iov_len);
1816 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1817 }
1818 /*
1819 * If there is no current tail data, make sure there is
1820 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1821 * allotted page, and set up tail information such that there
1822 * is RPC_MAX_AUTH_SIZE slack space available in both the
1823 * head and tail.
1824 */
1825 if (resbuf->tail[0].iov_base == NULL) {
1826 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1827 return -ENOMEM;
1828 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1829 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1830 resbuf->tail[0].iov_len = 0;
1831 }
1832 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1833 return -ENOMEM;
1834 *len = htonl(resbuf->len - offset);
1835 pad = 3 - ((resbuf->len - offset - 1)&3);
1836 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1837 memset(p, 0, pad);
1838 resbuf->tail[0].iov_len += pad;
1839 resbuf->len += pad;
1840 return 0;
1841}
1842
1843static int
1844svcauth_gss_release(struct svc_rqst *rqstp)
1845{
1846 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1847 struct rpc_gss_wire_cred *gc;
1848 struct xdr_buf *resbuf = &rqstp->rq_res;
1849 int stat = -EINVAL;
1850 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1851
1852 if (!gsd)
1853 goto out;
1854 gc = &gsd->clcred;
1855 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1856 goto out;
1857 /* Release can be called twice, but we only wrap once. */
1858 if (gsd->verf_start == NULL)
1859 goto out;
1860 /* normally not set till svc_send, but we need it here: */
1861 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1862 * or whatever? */
1863 resbuf->len = total_buf_len(resbuf);
1864 switch (gc->gc_svc) {
1865 case RPC_GSS_SVC_NONE:
1866 break;
1867 case RPC_GSS_SVC_INTEGRITY:
1868 stat = svcauth_gss_wrap_resp_integ(rqstp);
1869 if (stat)
1870 goto out_err;
1871 break;
1872 case RPC_GSS_SVC_PRIVACY:
1873 stat = svcauth_gss_wrap_resp_priv(rqstp);
1874 if (stat)
1875 goto out_err;
1876 break;
1877 /*
1878 * For any other gc_svc value, svcauth_gss_accept() already set
1879 * the auth_error appropriately; just fall through:
1880 */
1881 }
1882
1883out:
1884 stat = 0;
1885out_err:
1886 if (rqstp->rq_client)
1887 auth_domain_put(rqstp->rq_client);
1888 rqstp->rq_client = NULL;
1889 if (rqstp->rq_gssclient)
1890 auth_domain_put(rqstp->rq_gssclient);
1891 rqstp->rq_gssclient = NULL;
1892 if (rqstp->rq_cred.cr_group_info)
1893 put_group_info(rqstp->rq_cred.cr_group_info);
1894 rqstp->rq_cred.cr_group_info = NULL;
1895 if (gsd && gsd->rsci) {
1896 cache_put(&gsd->rsci->h, sn->rsc_cache);
1897 gsd->rsci = NULL;
1898 }
1899 return stat;
1900}
1901
1902static void
1903svcauth_gss_domain_release_rcu(struct rcu_head *head)
1904{
1905 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1906 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1907
1908 kfree(dom->name);
1909 kfree(gd);
1910}
1911
1912static void
1913svcauth_gss_domain_release(struct auth_domain *dom)
1914{
1915 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1916}
1917
1918static struct auth_ops svcauthops_gss = {
1919 .name = "rpcsec_gss",
1920 .owner = THIS_MODULE,
1921 .flavour = RPC_AUTH_GSS,
1922 .accept = svcauth_gss_accept,
1923 .release = svcauth_gss_release,
1924 .domain_release = svcauth_gss_domain_release,
1925 .set_client = svcauth_gss_set_client,
1926};
1927
1928static int rsi_cache_create_net(struct net *net)
1929{
1930 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1931 struct cache_detail *cd;
1932 int err;
1933
1934 cd = cache_create_net(&rsi_cache_template, net);
1935 if (IS_ERR(cd))
1936 return PTR_ERR(cd);
1937 err = cache_register_net(cd, net);
1938 if (err) {
1939 cache_destroy_net(cd, net);
1940 return err;
1941 }
1942 sn->rsi_cache = cd;
1943 return 0;
1944}
1945
1946static void rsi_cache_destroy_net(struct net *net)
1947{
1948 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1949 struct cache_detail *cd = sn->rsi_cache;
1950
1951 sn->rsi_cache = NULL;
1952 cache_purge(cd);
1953 cache_unregister_net(cd, net);
1954 cache_destroy_net(cd, net);
1955}
1956
1957static int rsc_cache_create_net(struct net *net)
1958{
1959 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1960 struct cache_detail *cd;
1961 int err;
1962
1963 cd = cache_create_net(&rsc_cache_template, net);
1964 if (IS_ERR(cd))
1965 return PTR_ERR(cd);
1966 err = cache_register_net(cd, net);
1967 if (err) {
1968 cache_destroy_net(cd, net);
1969 return err;
1970 }
1971 sn->rsc_cache = cd;
1972 return 0;
1973}
1974
1975static void rsc_cache_destroy_net(struct net *net)
1976{
1977 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1978 struct cache_detail *cd = sn->rsc_cache;
1979
1980 sn->rsc_cache = NULL;
1981 cache_purge(cd);
1982 cache_unregister_net(cd, net);
1983 cache_destroy_net(cd, net);
1984}
1985
1986int
1987gss_svc_init_net(struct net *net)
1988{
1989 int rv;
1990
1991 rv = rsc_cache_create_net(net);
1992 if (rv)
1993 return rv;
1994 rv = rsi_cache_create_net(net);
1995 if (rv)
1996 goto out1;
1997 rv = create_use_gss_proxy_proc_entry(net);
1998 if (rv)
1999 goto out2;
2000 return 0;
2001out2:
2002 rsi_cache_destroy_net(net);
2003out1:
2004 rsc_cache_destroy_net(net);
2005 return rv;
2006}
2007
2008void
2009gss_svc_shutdown_net(struct net *net)
2010{
2011 destroy_use_gss_proxy_proc_entry(net);
2012 rsi_cache_destroy_net(net);
2013 rsc_cache_destroy_net(net);
2014}
2015
2016int
2017gss_svc_init(void)
2018{
2019 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
2020}
2021
2022void
2023gss_svc_shutdown(void)
2024{
2025 svc_auth_unregister(RPC_AUTH_GSS);
2026}
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#include <linux/sunrpc/gss_krb5.h>
53
54#include <trace/events/rpcgss.h>
55
56#include "gss_rpc_upcall.h"
57
58/*
59 * Unfortunately there isn't a maximum checksum size exported via the
60 * GSS API. Manufacture one based on GSS mechanisms supported by this
61 * implementation.
62 */
63#define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN)
64
65/*
66 * This value may be increased in the future to accommodate other
67 * usage of the scratch buffer.
68 */
69#define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE
70
71struct gss_svc_data {
72 /* decoded gss client cred: */
73 struct rpc_gss_wire_cred clcred;
74 u32 gsd_databody_offset;
75 struct rsc *rsci;
76
77 /* for temporary results */
78 __be32 gsd_seq_num;
79 u8 gsd_scratch[GSS_SCRATCH_SIZE];
80};
81
82/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
83 * into replies.
84 *
85 * Key is context handle (\x if empty) and gss_token.
86 * Content is major_status minor_status (integers) context_handle, reply_token.
87 *
88 */
89
90static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
91{
92 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
93}
94
95#define RSI_HASHBITS 6
96#define RSI_HASHMAX (1<<RSI_HASHBITS)
97
98struct rsi {
99 struct cache_head h;
100 struct xdr_netobj in_handle, in_token;
101 struct xdr_netobj out_handle, out_token;
102 int major_status, minor_status;
103 struct rcu_head rcu_head;
104};
105
106static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
107static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
108
109static void rsi_free(struct rsi *rsii)
110{
111 kfree(rsii->in_handle.data);
112 kfree(rsii->in_token.data);
113 kfree(rsii->out_handle.data);
114 kfree(rsii->out_token.data);
115}
116
117static void rsi_free_rcu(struct rcu_head *head)
118{
119 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
120
121 rsi_free(rsii);
122 kfree(rsii);
123}
124
125static void rsi_put(struct kref *ref)
126{
127 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
128
129 call_rcu(&rsii->rcu_head, rsi_free_rcu);
130}
131
132static inline int rsi_hash(struct rsi *item)
133{
134 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
135 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
136}
137
138static int rsi_match(struct cache_head *a, struct cache_head *b)
139{
140 struct rsi *item = container_of(a, struct rsi, h);
141 struct rsi *tmp = container_of(b, struct rsi, h);
142 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
143 netobj_equal(&item->in_token, &tmp->in_token);
144}
145
146static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
147{
148 dst->len = len;
149 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
150 if (len && !dst->data)
151 return -ENOMEM;
152 return 0;
153}
154
155static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
156{
157 return dup_to_netobj(dst, src->data, src->len);
158}
159
160static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
161{
162 struct rsi *new = container_of(cnew, struct rsi, h);
163 struct rsi *item = container_of(citem, struct rsi, h);
164
165 new->out_handle.data = NULL;
166 new->out_handle.len = 0;
167 new->out_token.data = NULL;
168 new->out_token.len = 0;
169 new->in_handle.len = item->in_handle.len;
170 item->in_handle.len = 0;
171 new->in_token.len = item->in_token.len;
172 item->in_token.len = 0;
173 new->in_handle.data = item->in_handle.data;
174 item->in_handle.data = NULL;
175 new->in_token.data = item->in_token.data;
176 item->in_token.data = NULL;
177}
178
179static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
180{
181 struct rsi *new = container_of(cnew, struct rsi, h);
182 struct rsi *item = container_of(citem, struct rsi, h);
183
184 BUG_ON(new->out_handle.data || new->out_token.data);
185 new->out_handle.len = item->out_handle.len;
186 item->out_handle.len = 0;
187 new->out_token.len = item->out_token.len;
188 item->out_token.len = 0;
189 new->out_handle.data = item->out_handle.data;
190 item->out_handle.data = NULL;
191 new->out_token.data = item->out_token.data;
192 item->out_token.data = NULL;
193
194 new->major_status = item->major_status;
195 new->minor_status = item->minor_status;
196}
197
198static struct cache_head *rsi_alloc(void)
199{
200 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
201 if (rsii)
202 return &rsii->h;
203 else
204 return NULL;
205}
206
207static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
208{
209 return sunrpc_cache_pipe_upcall_timeout(cd, h);
210}
211
212static void rsi_request(struct cache_detail *cd,
213 struct cache_head *h,
214 char **bpp, int *blen)
215{
216 struct rsi *rsii = container_of(h, struct rsi, h);
217
218 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
219 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
220 (*bpp)[-1] = '\n';
221 WARN_ONCE(*blen < 0,
222 "RPCSEC/GSS credential too large - please use gssproxy\n");
223}
224
225static int rsi_parse(struct cache_detail *cd,
226 char *mesg, int mlen)
227{
228 /* context token expiry major minor context token */
229 char *buf = mesg;
230 char *ep;
231 int len;
232 struct rsi rsii, *rsip = NULL;
233 time64_t expiry;
234 int status = -EINVAL;
235
236 memset(&rsii, 0, sizeof(rsii));
237 /* handle */
238 len = qword_get(&mesg, buf, mlen);
239 if (len < 0)
240 goto out;
241 status = -ENOMEM;
242 if (dup_to_netobj(&rsii.in_handle, buf, len))
243 goto out;
244
245 /* token */
246 len = qword_get(&mesg, buf, mlen);
247 status = -EINVAL;
248 if (len < 0)
249 goto out;
250 status = -ENOMEM;
251 if (dup_to_netobj(&rsii.in_token, buf, len))
252 goto out;
253
254 rsip = rsi_lookup(cd, &rsii);
255 if (!rsip)
256 goto out;
257
258 rsii.h.flags = 0;
259 /* expiry */
260 status = get_expiry(&mesg, &expiry);
261 if (status)
262 goto out;
263
264 status = -EINVAL;
265 /* major/minor */
266 len = qword_get(&mesg, buf, mlen);
267 if (len <= 0)
268 goto out;
269 rsii.major_status = simple_strtoul(buf, &ep, 10);
270 if (*ep)
271 goto out;
272 len = qword_get(&mesg, buf, mlen);
273 if (len <= 0)
274 goto out;
275 rsii.minor_status = simple_strtoul(buf, &ep, 10);
276 if (*ep)
277 goto out;
278
279 /* out_handle */
280 len = qword_get(&mesg, buf, mlen);
281 if (len < 0)
282 goto out;
283 status = -ENOMEM;
284 if (dup_to_netobj(&rsii.out_handle, buf, len))
285 goto out;
286
287 /* out_token */
288 len = qword_get(&mesg, buf, mlen);
289 status = -EINVAL;
290 if (len < 0)
291 goto out;
292 status = -ENOMEM;
293 if (dup_to_netobj(&rsii.out_token, buf, len))
294 goto out;
295 rsii.h.expiry_time = expiry;
296 rsip = rsi_update(cd, &rsii, rsip);
297 status = 0;
298out:
299 rsi_free(&rsii);
300 if (rsip)
301 cache_put(&rsip->h, cd);
302 else
303 status = -ENOMEM;
304 return status;
305}
306
307static const struct cache_detail rsi_cache_template = {
308 .owner = THIS_MODULE,
309 .hash_size = RSI_HASHMAX,
310 .name = "auth.rpcsec.init",
311 .cache_put = rsi_put,
312 .cache_upcall = rsi_upcall,
313 .cache_request = rsi_request,
314 .cache_parse = rsi_parse,
315 .match = rsi_match,
316 .init = rsi_init,
317 .update = update_rsi,
318 .alloc = rsi_alloc,
319};
320
321static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
322{
323 struct cache_head *ch;
324 int hash = rsi_hash(item);
325
326 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
327 if (ch)
328 return container_of(ch, struct rsi, h);
329 else
330 return NULL;
331}
332
333static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
334{
335 struct cache_head *ch;
336 int hash = rsi_hash(new);
337
338 ch = sunrpc_cache_update(cd, &new->h,
339 &old->h, hash);
340 if (ch)
341 return container_of(ch, struct rsi, h);
342 else
343 return NULL;
344}
345
346
347/*
348 * The rpcsec_context cache is used to store a context that is
349 * used in data exchange.
350 * The key is a context handle. The content is:
351 * uid, gidlist, mechanism, service-set, mech-specific-data
352 */
353
354#define RSC_HASHBITS 10
355#define RSC_HASHMAX (1<<RSC_HASHBITS)
356
357#define GSS_SEQ_WIN 128
358
359struct gss_svc_seq_data {
360 /* highest seq number seen so far: */
361 u32 sd_max;
362 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
363 * sd_win is nonzero iff sequence number i has been seen already: */
364 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
365 spinlock_t sd_lock;
366};
367
368struct rsc {
369 struct cache_head h;
370 struct xdr_netobj handle;
371 struct svc_cred cred;
372 struct gss_svc_seq_data seqdata;
373 struct gss_ctx *mechctx;
374 struct rcu_head rcu_head;
375};
376
377static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
378static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
379
380static void rsc_free(struct rsc *rsci)
381{
382 kfree(rsci->handle.data);
383 if (rsci->mechctx)
384 gss_delete_sec_context(&rsci->mechctx);
385 free_svc_cred(&rsci->cred);
386}
387
388static void rsc_free_rcu(struct rcu_head *head)
389{
390 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
391
392 kfree(rsci->handle.data);
393 kfree(rsci);
394}
395
396static void rsc_put(struct kref *ref)
397{
398 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
399
400 if (rsci->mechctx)
401 gss_delete_sec_context(&rsci->mechctx);
402 free_svc_cred(&rsci->cred);
403 call_rcu(&rsci->rcu_head, rsc_free_rcu);
404}
405
406static inline int
407rsc_hash(struct rsc *rsci)
408{
409 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
410}
411
412static int
413rsc_match(struct cache_head *a, struct cache_head *b)
414{
415 struct rsc *new = container_of(a, struct rsc, h);
416 struct rsc *tmp = container_of(b, struct rsc, h);
417
418 return netobj_equal(&new->handle, &tmp->handle);
419}
420
421static void
422rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
423{
424 struct rsc *new = container_of(cnew, struct rsc, h);
425 struct rsc *tmp = container_of(ctmp, struct rsc, h);
426
427 new->handle.len = tmp->handle.len;
428 tmp->handle.len = 0;
429 new->handle.data = tmp->handle.data;
430 tmp->handle.data = NULL;
431 new->mechctx = NULL;
432 init_svc_cred(&new->cred);
433}
434
435static void
436update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
437{
438 struct rsc *new = container_of(cnew, struct rsc, h);
439 struct rsc *tmp = container_of(ctmp, struct rsc, h);
440
441 new->mechctx = tmp->mechctx;
442 tmp->mechctx = NULL;
443 memset(&new->seqdata, 0, sizeof(new->seqdata));
444 spin_lock_init(&new->seqdata.sd_lock);
445 new->cred = tmp->cred;
446 init_svc_cred(&tmp->cred);
447}
448
449static struct cache_head *
450rsc_alloc(void)
451{
452 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
453 if (rsci)
454 return &rsci->h;
455 else
456 return NULL;
457}
458
459static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
460{
461 return -EINVAL;
462}
463
464static int rsc_parse(struct cache_detail *cd,
465 char *mesg, int mlen)
466{
467 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
468 char *buf = mesg;
469 int id;
470 int len, rv;
471 struct rsc rsci, *rscp = NULL;
472 time64_t expiry;
473 int status = -EINVAL;
474 struct gss_api_mech *gm = NULL;
475
476 memset(&rsci, 0, sizeof(rsci));
477 /* context handle */
478 len = qword_get(&mesg, buf, mlen);
479 if (len < 0) goto out;
480 status = -ENOMEM;
481 if (dup_to_netobj(&rsci.handle, buf, len))
482 goto out;
483
484 rsci.h.flags = 0;
485 /* expiry */
486 status = get_expiry(&mesg, &expiry);
487 if (status)
488 goto out;
489
490 status = -EINVAL;
491 rscp = rsc_lookup(cd, &rsci);
492 if (!rscp)
493 goto out;
494
495 /* uid, or NEGATIVE */
496 rv = get_int(&mesg, &id);
497 if (rv == -EINVAL)
498 goto out;
499 if (rv == -ENOENT)
500 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
501 else {
502 int N, i;
503
504 /*
505 * NOTE: we skip uid_valid()/gid_valid() checks here:
506 * instead, * -1 id's are later mapped to the
507 * (export-specific) anonymous id by nfsd_setuser.
508 *
509 * (But supplementary gid's get no such special
510 * treatment so are checked for validity here.)
511 */
512 /* uid */
513 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
514
515 /* gid */
516 if (get_int(&mesg, &id))
517 goto out;
518 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
519
520 /* number of additional gid's */
521 if (get_int(&mesg, &N))
522 goto out;
523 if (N < 0 || N > NGROUPS_MAX)
524 goto out;
525 status = -ENOMEM;
526 rsci.cred.cr_group_info = groups_alloc(N);
527 if (rsci.cred.cr_group_info == NULL)
528 goto out;
529
530 /* gid's */
531 status = -EINVAL;
532 for (i=0; i<N; i++) {
533 kgid_t kgid;
534 if (get_int(&mesg, &id))
535 goto out;
536 kgid = make_kgid(current_user_ns(), id);
537 if (!gid_valid(kgid))
538 goto out;
539 rsci.cred.cr_group_info->gid[i] = kgid;
540 }
541 groups_sort(rsci.cred.cr_group_info);
542
543 /* mech name */
544 len = qword_get(&mesg, buf, mlen);
545 if (len < 0)
546 goto out;
547 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
548 status = -EOPNOTSUPP;
549 if (!gm)
550 goto out;
551
552 status = -EINVAL;
553 /* mech-specific data: */
554 len = qword_get(&mesg, buf, mlen);
555 if (len < 0)
556 goto out;
557 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
558 NULL, GFP_KERNEL);
559 if (status)
560 goto out;
561
562 /* get client name */
563 len = qword_get(&mesg, buf, mlen);
564 if (len > 0) {
565 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
566 if (!rsci.cred.cr_principal) {
567 status = -ENOMEM;
568 goto out;
569 }
570 }
571
572 }
573 rsci.h.expiry_time = expiry;
574 rscp = rsc_update(cd, &rsci, rscp);
575 status = 0;
576out:
577 rsc_free(&rsci);
578 if (rscp)
579 cache_put(&rscp->h, cd);
580 else
581 status = -ENOMEM;
582 return status;
583}
584
585static const struct cache_detail rsc_cache_template = {
586 .owner = THIS_MODULE,
587 .hash_size = RSC_HASHMAX,
588 .name = "auth.rpcsec.context",
589 .cache_put = rsc_put,
590 .cache_upcall = rsc_upcall,
591 .cache_parse = rsc_parse,
592 .match = rsc_match,
593 .init = rsc_init,
594 .update = update_rsc,
595 .alloc = rsc_alloc,
596};
597
598static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
599{
600 struct cache_head *ch;
601 int hash = rsc_hash(item);
602
603 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
604 if (ch)
605 return container_of(ch, struct rsc, h);
606 else
607 return NULL;
608}
609
610static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
611{
612 struct cache_head *ch;
613 int hash = rsc_hash(new);
614
615 ch = sunrpc_cache_update(cd, &new->h,
616 &old->h, hash);
617 if (ch)
618 return container_of(ch, struct rsc, h);
619 else
620 return NULL;
621}
622
623
624static struct rsc *
625gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
626{
627 struct rsc rsci;
628 struct rsc *found;
629
630 memset(&rsci, 0, sizeof(rsci));
631 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
632 return NULL;
633 found = rsc_lookup(cd, &rsci);
634 rsc_free(&rsci);
635 if (!found)
636 return NULL;
637 if (cache_check(cd, &found->h, NULL))
638 return NULL;
639 return found;
640}
641
642/**
643 * gss_check_seq_num - GSS sequence number window check
644 * @rqstp: RPC Call to use when reporting errors
645 * @rsci: cached GSS context state (updated on return)
646 * @seq_num: sequence number to check
647 *
648 * Implements sequence number algorithm as specified in
649 * RFC 2203, Section 5.3.3.1. "Context Management".
650 *
651 * Return values:
652 * %true: @rqstp's GSS sequence number is inside the window
653 * %false: @rqstp's GSS sequence number is outside the window
654 */
655static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
656 u32 seq_num)
657{
658 struct gss_svc_seq_data *sd = &rsci->seqdata;
659 bool result = false;
660
661 spin_lock(&sd->sd_lock);
662 if (seq_num > sd->sd_max) {
663 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
664 memset(sd->sd_win, 0, sizeof(sd->sd_win));
665 sd->sd_max = seq_num;
666 } else while (sd->sd_max < seq_num) {
667 sd->sd_max++;
668 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
669 }
670 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
671 goto ok;
672 } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
673 goto toolow;
674 }
675 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
676 goto alreadyseen;
677
678ok:
679 result = true;
680out:
681 spin_unlock(&sd->sd_lock);
682 return result;
683
684toolow:
685 trace_rpcgss_svc_seqno_low(rqstp, seq_num,
686 sd->sd_max - GSS_SEQ_WIN,
687 sd->sd_max);
688 goto out;
689alreadyseen:
690 trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
691 goto out;
692}
693
694/*
695 * Decode and verify a Call's verifier field. For RPC_AUTH_GSS Calls,
696 * the body of this field contains a variable length checksum.
697 *
698 * GSS-specific auth_stat values are mandated by RFC 2203 Section
699 * 5.3.3.3.
700 */
701static int
702svcauth_gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
703 __be32 *rpcstart, struct rpc_gss_wire_cred *gc)
704{
705 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
706 struct gss_ctx *ctx_id = rsci->mechctx;
707 u32 flavor, maj_stat;
708 struct xdr_buf rpchdr;
709 struct xdr_netobj checksum;
710 struct kvec iov;
711
712 /*
713 * Compute the checksum of the incoming Call from the
714 * XID field to credential field:
715 */
716 iov.iov_base = rpcstart;
717 iov.iov_len = (u8 *)xdr->p - (u8 *)rpcstart;
718 xdr_buf_from_iov(&iov, &rpchdr);
719
720 /* Call's verf field: */
721 if (xdr_stream_decode_opaque_auth(xdr, &flavor,
722 (void **)&checksum.data,
723 &checksum.len) < 0) {
724 rqstp->rq_auth_stat = rpc_autherr_badverf;
725 return SVC_DENIED;
726 }
727 if (flavor != RPC_AUTH_GSS) {
728 rqstp->rq_auth_stat = rpc_autherr_badverf;
729 return SVC_DENIED;
730 }
731
732 if (rqstp->rq_deferred)
733 return SVC_OK;
734 maj_stat = gss_verify_mic(ctx_id, &rpchdr, &checksum);
735 if (maj_stat != GSS_S_COMPLETE) {
736 trace_rpcgss_svc_mic(rqstp, maj_stat);
737 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
738 return SVC_DENIED;
739 }
740
741 if (gc->gc_seq > MAXSEQ) {
742 trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
743 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
744 return SVC_DENIED;
745 }
746 if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
747 return SVC_DROP;
748 return SVC_OK;
749}
750
751/*
752 * Construct and encode a Reply's verifier field. The verifier's body
753 * field contains a variable-length checksum of the GSS sequence
754 * number.
755 */
756static bool
757svcauth_gss_encode_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
758{
759 struct gss_svc_data *gsd = rqstp->rq_auth_data;
760 u32 maj_stat;
761 struct xdr_buf verf_data;
762 struct xdr_netobj checksum;
763 struct kvec iov;
764
765 gsd->gsd_seq_num = cpu_to_be32(seq);
766 iov.iov_base = &gsd->gsd_seq_num;
767 iov.iov_len = XDR_UNIT;
768 xdr_buf_from_iov(&iov, &verf_data);
769
770 checksum.data = gsd->gsd_scratch;
771 maj_stat = gss_get_mic(ctx_id, &verf_data, &checksum);
772 if (maj_stat != GSS_S_COMPLETE)
773 goto bad_mic;
774
775 return xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream, RPC_AUTH_GSS,
776 checksum.data, checksum.len) > 0;
777
778bad_mic:
779 trace_rpcgss_svc_get_mic(rqstp, maj_stat);
780 return false;
781}
782
783struct gss_domain {
784 struct auth_domain h;
785 u32 pseudoflavor;
786};
787
788static struct auth_domain *
789find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
790{
791 char *name;
792
793 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
794 if (!name)
795 return NULL;
796 return auth_domain_find(name);
797}
798
799static struct auth_ops svcauthops_gss;
800
801u32 svcauth_gss_flavor(struct auth_domain *dom)
802{
803 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
804
805 return gd->pseudoflavor;
806}
807
808EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
809
810struct auth_domain *
811svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
812{
813 struct gss_domain *new;
814 struct auth_domain *test;
815 int stat = -ENOMEM;
816
817 new = kmalloc(sizeof(*new), GFP_KERNEL);
818 if (!new)
819 goto out;
820 kref_init(&new->h.ref);
821 new->h.name = kstrdup(name, GFP_KERNEL);
822 if (!new->h.name)
823 goto out_free_dom;
824 new->h.flavour = &svcauthops_gss;
825 new->pseudoflavor = pseudoflavor;
826
827 test = auth_domain_lookup(name, &new->h);
828 if (test != &new->h) {
829 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
830 name);
831 stat = -EADDRINUSE;
832 auth_domain_put(test);
833 goto out_free_name;
834 }
835 return test;
836
837out_free_name:
838 kfree(new->h.name);
839out_free_dom:
840 kfree(new);
841out:
842 return ERR_PTR(stat);
843}
844EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
845
846/*
847 * RFC 2203, Section 5.3.2.2
848 *
849 * struct rpc_gss_integ_data {
850 * opaque databody_integ<>;
851 * opaque checksum<>;
852 * };
853 *
854 * struct rpc_gss_data_t {
855 * unsigned int seq_num;
856 * proc_req_arg_t arg;
857 * };
858 */
859static noinline_for_stack int
860svcauth_gss_unwrap_integ(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx)
861{
862 struct gss_svc_data *gsd = rqstp->rq_auth_data;
863 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
864 u32 len, offset, seq_num, maj_stat;
865 struct xdr_buf *buf = xdr->buf;
866 struct xdr_buf databody_integ;
867 struct xdr_netobj checksum;
868
869 /* Did we already verify the signature on the original pass through? */
870 if (rqstp->rq_deferred)
871 return 0;
872
873 if (xdr_stream_decode_u32(xdr, &len) < 0)
874 goto unwrap_failed;
875 if (len & 3)
876 goto unwrap_failed;
877 offset = xdr_stream_pos(xdr);
878 if (xdr_buf_subsegment(buf, &databody_integ, offset, len))
879 goto unwrap_failed;
880
881 /*
882 * The xdr_stream now points to the @seq_num field. The next
883 * XDR data item is the @arg field, which contains the clear
884 * text RPC program payload. The checksum, which follows the
885 * @arg field, is located and decoded without updating the
886 * xdr_stream.
887 */
888
889 offset += len;
890 if (xdr_decode_word(buf, offset, &checksum.len))
891 goto unwrap_failed;
892 if (checksum.len > sizeof(gsd->gsd_scratch))
893 goto unwrap_failed;
894 checksum.data = gsd->gsd_scratch;
895 if (read_bytes_from_xdr_buf(buf, offset + XDR_UNIT, checksum.data,
896 checksum.len))
897 goto unwrap_failed;
898
899 maj_stat = gss_verify_mic(ctx, &databody_integ, &checksum);
900 if (maj_stat != GSS_S_COMPLETE)
901 goto bad_mic;
902
903 /* The received seqno is protected by the checksum. */
904 if (xdr_stream_decode_u32(xdr, &seq_num) < 0)
905 goto unwrap_failed;
906 if (seq_num != seq)
907 goto bad_seqno;
908
909 xdr_truncate_decode(xdr, XDR_UNIT + checksum.len);
910 return 0;
911
912unwrap_failed:
913 trace_rpcgss_svc_unwrap_failed(rqstp);
914 return -EINVAL;
915bad_seqno:
916 trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num);
917 return -EINVAL;
918bad_mic:
919 trace_rpcgss_svc_mic(rqstp, maj_stat);
920 return -EINVAL;
921}
922
923/*
924 * RFC 2203, Section 5.3.2.3
925 *
926 * struct rpc_gss_priv_data {
927 * opaque databody_priv<>
928 * };
929 *
930 * struct rpc_gss_data_t {
931 * unsigned int seq_num;
932 * proc_req_arg_t arg;
933 * };
934 */
935static noinline_for_stack int
936svcauth_gss_unwrap_priv(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx)
937{
938 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
939 u32 len, maj_stat, seq_num, offset;
940 struct xdr_buf *buf = xdr->buf;
941 unsigned int saved_len;
942
943 if (xdr_stream_decode_u32(xdr, &len) < 0)
944 goto unwrap_failed;
945 if (rqstp->rq_deferred) {
946 /* Already decrypted last time through! The sequence number
947 * check at out_seq is unnecessary but harmless: */
948 goto out_seq;
949 }
950 if (len > xdr_stream_remaining(xdr))
951 goto unwrap_failed;
952 offset = xdr_stream_pos(xdr);
953
954 saved_len = buf->len;
955 maj_stat = gss_unwrap(ctx, offset, offset + len, buf);
956 if (maj_stat != GSS_S_COMPLETE)
957 goto bad_unwrap;
958 xdr->nwords -= XDR_QUADLEN(saved_len - buf->len);
959
960out_seq:
961 /* gss_unwrap() decrypted the sequence number. */
962 if (xdr_stream_decode_u32(xdr, &seq_num) < 0)
963 goto unwrap_failed;
964 if (seq_num != seq)
965 goto bad_seqno;
966 return 0;
967
968unwrap_failed:
969 trace_rpcgss_svc_unwrap_failed(rqstp);
970 return -EINVAL;
971bad_seqno:
972 trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num);
973 return -EINVAL;
974bad_unwrap:
975 trace_rpcgss_svc_unwrap(rqstp, maj_stat);
976 return -EINVAL;
977}
978
979static enum svc_auth_status
980svcauth_gss_set_client(struct svc_rqst *rqstp)
981{
982 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
983 struct rsc *rsci = svcdata->rsci;
984 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
985 int stat;
986
987 rqstp->rq_auth_stat = rpc_autherr_badcred;
988
989 /*
990 * A gss export can be specified either by:
991 * export *(sec=krb5,rw)
992 * or by
993 * export gss/krb5(rw)
994 * The latter is deprecated; but for backwards compatibility reasons
995 * the nfsd code will still fall back on trying it if the former
996 * doesn't work; so we try to make both available to nfsd, below.
997 */
998 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
999 if (rqstp->rq_gssclient == NULL)
1000 return SVC_DENIED;
1001 stat = svcauth_unix_set_client(rqstp);
1002 if (stat == SVC_DROP || stat == SVC_CLOSE)
1003 return stat;
1004
1005 rqstp->rq_auth_stat = rpc_auth_ok;
1006 return SVC_OK;
1007}
1008
1009static bool
1010svcauth_gss_proc_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1011 struct xdr_netobj *out_handle, int *major_status,
1012 u32 seq_num)
1013{
1014 struct xdr_stream *xdr = &rqstp->rq_res_stream;
1015 struct rsc *rsci;
1016 bool rc;
1017
1018 if (*major_status != GSS_S_COMPLETE)
1019 goto null_verifier;
1020 rsci = gss_svc_searchbyctx(cd, out_handle);
1021 if (rsci == NULL) {
1022 *major_status = GSS_S_NO_CONTEXT;
1023 goto null_verifier;
1024 }
1025
1026 rc = svcauth_gss_encode_verf(rqstp, rsci->mechctx, seq_num);
1027 cache_put(&rsci->h, cd);
1028 return rc;
1029
1030null_verifier:
1031 return xdr_stream_encode_opaque_auth(xdr, RPC_AUTH_NULL, NULL, 0) > 0;
1032}
1033
1034static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1035{
1036 int i;
1037
1038 i = 0;
1039 while (in_token->pages[i])
1040 put_page(in_token->pages[i++]);
1041 kfree(in_token->pages);
1042 in_token->pages = NULL;
1043}
1044
1045static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1046 struct rpc_gss_wire_cred *gc,
1047 struct xdr_netobj *in_handle,
1048 struct gssp_in_token *in_token)
1049{
1050 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1051 unsigned int length, pgto_offs, pgfrom_offs;
1052 int pages, i, pgto, pgfrom;
1053 size_t to_offs, from_offs;
1054 u32 inlen;
1055
1056 if (dup_netobj(in_handle, &gc->gc_ctx))
1057 return SVC_CLOSE;
1058
1059 /*
1060 * RFC 2203 Section 5.2.2
1061 *
1062 * struct rpc_gss_init_arg {
1063 * opaque gss_token<>;
1064 * };
1065 */
1066 if (xdr_stream_decode_u32(xdr, &inlen) < 0)
1067 goto out_denied_free;
1068 if (inlen > xdr_stream_remaining(xdr))
1069 goto out_denied_free;
1070
1071 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1072 in_token->pages = kcalloc(pages + 1, sizeof(struct page *), GFP_KERNEL);
1073 if (!in_token->pages)
1074 goto out_denied_free;
1075 in_token->page_base = 0;
1076 in_token->page_len = inlen;
1077 for (i = 0; i < pages; i++) {
1078 in_token->pages[i] = alloc_page(GFP_KERNEL);
1079 if (!in_token->pages[i]) {
1080 gss_free_in_token_pages(in_token);
1081 goto out_denied_free;
1082 }
1083 }
1084
1085 length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p);
1086 memcpy(page_address(in_token->pages[0]), xdr->p, length);
1087 inlen -= length;
1088
1089 to_offs = length;
1090 from_offs = rqstp->rq_arg.page_base;
1091 while (inlen) {
1092 pgto = to_offs >> PAGE_SHIFT;
1093 pgfrom = from_offs >> PAGE_SHIFT;
1094 pgto_offs = to_offs & ~PAGE_MASK;
1095 pgfrom_offs = from_offs & ~PAGE_MASK;
1096
1097 length = min_t(unsigned int, inlen,
1098 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1099 PAGE_SIZE - pgfrom_offs));
1100 memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1101 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1102 length);
1103
1104 to_offs += length;
1105 from_offs += length;
1106 inlen -= length;
1107 }
1108 return 0;
1109
1110out_denied_free:
1111 kfree(in_handle->data);
1112 return SVC_DENIED;
1113}
1114
1115/*
1116 * RFC 2203, Section 5.2.3.1.
1117 *
1118 * struct rpc_gss_init_res {
1119 * opaque handle<>;
1120 * unsigned int gss_major;
1121 * unsigned int gss_minor;
1122 * unsigned int seq_window;
1123 * opaque gss_token<>;
1124 * };
1125 */
1126static bool
1127svcxdr_encode_gss_init_res(struct xdr_stream *xdr,
1128 struct xdr_netobj *handle,
1129 struct xdr_netobj *gss_token,
1130 unsigned int major_status,
1131 unsigned int minor_status, u32 seq_num)
1132{
1133 if (xdr_stream_encode_opaque(xdr, handle->data, handle->len) < 0)
1134 return false;
1135 if (xdr_stream_encode_u32(xdr, major_status) < 0)
1136 return false;
1137 if (xdr_stream_encode_u32(xdr, minor_status) < 0)
1138 return false;
1139 if (xdr_stream_encode_u32(xdr, seq_num) < 0)
1140 return false;
1141 if (xdr_stream_encode_opaque(xdr, gss_token->data, gss_token->len) < 0)
1142 return false;
1143 return true;
1144}
1145
1146/*
1147 * Having read the cred already and found we're in the context
1148 * initiation case, read the verifier and initiate (or check the results
1149 * of) upcalls to userspace for help with context initiation. If
1150 * the upcall results are available, write the verifier and result.
1151 * Otherwise, drop the request pending an answer to the upcall.
1152 */
1153static int
1154svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1155 struct rpc_gss_wire_cred *gc)
1156{
1157 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1158 struct rsi *rsip, rsikey;
1159 __be32 *p;
1160 u32 len;
1161 int ret;
1162 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1163
1164 memset(&rsikey, 0, sizeof(rsikey));
1165 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx))
1166 return SVC_CLOSE;
1167
1168 /*
1169 * RFC 2203 Section 5.2.2
1170 *
1171 * struct rpc_gss_init_arg {
1172 * opaque gss_token<>;
1173 * };
1174 */
1175 if (xdr_stream_decode_u32(xdr, &len) < 0) {
1176 kfree(rsikey.in_handle.data);
1177 return SVC_DENIED;
1178 }
1179 p = xdr_inline_decode(xdr, len);
1180 if (!p) {
1181 kfree(rsikey.in_handle.data);
1182 return SVC_DENIED;
1183 }
1184 rsikey.in_token.data = kmalloc(len, GFP_KERNEL);
1185 if (ZERO_OR_NULL_PTR(rsikey.in_token.data)) {
1186 kfree(rsikey.in_handle.data);
1187 return SVC_CLOSE;
1188 }
1189 memcpy(rsikey.in_token.data, p, len);
1190 rsikey.in_token.len = len;
1191
1192 /* Perform upcall, or find upcall result: */
1193 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1194 rsi_free(&rsikey);
1195 if (!rsip)
1196 return SVC_CLOSE;
1197 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1198 /* No upcall result: */
1199 return SVC_CLOSE;
1200
1201 ret = SVC_CLOSE;
1202 if (!svcauth_gss_proc_init_verf(sn->rsc_cache, rqstp, &rsip->out_handle,
1203 &rsip->major_status, GSS_SEQ_WIN))
1204 goto out;
1205 if (!svcxdr_set_accept_stat(rqstp))
1206 goto out;
1207 if (!svcxdr_encode_gss_init_res(&rqstp->rq_res_stream, &rsip->out_handle,
1208 &rsip->out_token, rsip->major_status,
1209 rsip->minor_status, GSS_SEQ_WIN))
1210 goto out;
1211
1212 ret = SVC_COMPLETE;
1213out:
1214 cache_put(&rsip->h, sn->rsi_cache);
1215 return ret;
1216}
1217
1218static int gss_proxy_save_rsc(struct cache_detail *cd,
1219 struct gssp_upcall_data *ud,
1220 uint64_t *handle)
1221{
1222 struct rsc rsci, *rscp = NULL;
1223 static atomic64_t ctxhctr;
1224 long long ctxh;
1225 struct gss_api_mech *gm = NULL;
1226 time64_t expiry;
1227 int status;
1228
1229 memset(&rsci, 0, sizeof(rsci));
1230 /* context handle */
1231 status = -ENOMEM;
1232 /* the handle needs to be just a unique id,
1233 * use a static counter */
1234 ctxh = atomic64_inc_return(&ctxhctr);
1235
1236 /* make a copy for the caller */
1237 *handle = ctxh;
1238
1239 /* make a copy for the rsc cache */
1240 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1241 goto out;
1242 rscp = rsc_lookup(cd, &rsci);
1243 if (!rscp)
1244 goto out;
1245
1246 /* creds */
1247 if (!ud->found_creds) {
1248 /* userspace seem buggy, we should always get at least a
1249 * mapping to nobody */
1250 goto out;
1251 } else {
1252 struct timespec64 boot;
1253
1254 /* steal creds */
1255 rsci.cred = ud->creds;
1256 memset(&ud->creds, 0, sizeof(struct svc_cred));
1257
1258 status = -EOPNOTSUPP;
1259 /* get mech handle from OID */
1260 gm = gss_mech_get_by_OID(&ud->mech_oid);
1261 if (!gm)
1262 goto out;
1263 rsci.cred.cr_gss_mech = gm;
1264
1265 status = -EINVAL;
1266 /* mech-specific data: */
1267 status = gss_import_sec_context(ud->out_handle.data,
1268 ud->out_handle.len,
1269 gm, &rsci.mechctx,
1270 &expiry, GFP_KERNEL);
1271 if (status)
1272 goto out;
1273
1274 getboottime64(&boot);
1275 expiry -= boot.tv_sec;
1276 }
1277
1278 rsci.h.expiry_time = expiry;
1279 rscp = rsc_update(cd, &rsci, rscp);
1280 status = 0;
1281out:
1282 rsc_free(&rsci);
1283 if (rscp)
1284 cache_put(&rscp->h, cd);
1285 else
1286 status = -ENOMEM;
1287 return status;
1288}
1289
1290static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1291 struct rpc_gss_wire_cred *gc)
1292{
1293 struct xdr_netobj cli_handle;
1294 struct gssp_upcall_data ud;
1295 uint64_t handle;
1296 int status;
1297 int ret;
1298 struct net *net = SVC_NET(rqstp);
1299 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1300
1301 memset(&ud, 0, sizeof(ud));
1302 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
1303 if (ret)
1304 return ret;
1305
1306 ret = SVC_CLOSE;
1307
1308 /* Perform synchronous upcall to gss-proxy */
1309 status = gssp_accept_sec_context_upcall(net, &ud);
1310 if (status)
1311 goto out;
1312
1313 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1314
1315 switch (ud.major_status) {
1316 case GSS_S_CONTINUE_NEEDED:
1317 cli_handle = ud.out_handle;
1318 break;
1319 case GSS_S_COMPLETE:
1320 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1321 if (status)
1322 goto out;
1323 cli_handle.data = (u8 *)&handle;
1324 cli_handle.len = sizeof(handle);
1325 break;
1326 default:
1327 goto out;
1328 }
1329
1330 if (!svcauth_gss_proc_init_verf(sn->rsc_cache, rqstp, &cli_handle,
1331 &ud.major_status, GSS_SEQ_WIN))
1332 goto out;
1333 if (!svcxdr_set_accept_stat(rqstp))
1334 goto out;
1335 if (!svcxdr_encode_gss_init_res(&rqstp->rq_res_stream, &cli_handle,
1336 &ud.out_token, ud.major_status,
1337 ud.minor_status, GSS_SEQ_WIN))
1338 goto out;
1339
1340 ret = SVC_COMPLETE;
1341out:
1342 gss_free_in_token_pages(&ud.in_token);
1343 gssp_free_upcall_data(&ud);
1344 return ret;
1345}
1346
1347/*
1348 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1349 * it to be changed if it's currently undefined (-1). If it's any other value
1350 * then return -EBUSY unless the type wouldn't have changed anyway.
1351 */
1352static int set_gss_proxy(struct net *net, int type)
1353{
1354 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1355 int ret;
1356
1357 WARN_ON_ONCE(type != 0 && type != 1);
1358 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1359 if (ret != -1 && ret != type)
1360 return -EBUSY;
1361 return 0;
1362}
1363
1364static bool use_gss_proxy(struct net *net)
1365{
1366 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1367
1368 /* If use_gss_proxy is still undefined, then try to disable it */
1369 if (sn->use_gss_proxy == -1)
1370 set_gss_proxy(net, 0);
1371 return sn->use_gss_proxy;
1372}
1373
1374static noinline_for_stack int
1375svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc)
1376{
1377 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
1378 u32 flavor, len;
1379 void *body;
1380
1381 /* Call's verf field: */
1382 if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
1383 return SVC_GARBAGE;
1384 if (flavor != RPC_AUTH_NULL || len != 0) {
1385 rqstp->rq_auth_stat = rpc_autherr_badverf;
1386 return SVC_DENIED;
1387 }
1388
1389 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) {
1390 rqstp->rq_auth_stat = rpc_autherr_badcred;
1391 return SVC_DENIED;
1392 }
1393
1394 if (!use_gss_proxy(SVC_NET(rqstp)))
1395 return svcauth_gss_legacy_init(rqstp, gc);
1396 return svcauth_gss_proxy_init(rqstp, gc);
1397}
1398
1399#ifdef CONFIG_PROC_FS
1400
1401static ssize_t write_gssp(struct file *file, const char __user *buf,
1402 size_t count, loff_t *ppos)
1403{
1404 struct net *net = pde_data(file_inode(file));
1405 char tbuf[20];
1406 unsigned long i;
1407 int res;
1408
1409 if (*ppos || count > sizeof(tbuf)-1)
1410 return -EINVAL;
1411 if (copy_from_user(tbuf, buf, count))
1412 return -EFAULT;
1413
1414 tbuf[count] = 0;
1415 res = kstrtoul(tbuf, 0, &i);
1416 if (res)
1417 return res;
1418 if (i != 1)
1419 return -EINVAL;
1420 res = set_gssp_clnt(net);
1421 if (res)
1422 return res;
1423 res = set_gss_proxy(net, 1);
1424 if (res)
1425 return res;
1426 return count;
1427}
1428
1429static ssize_t read_gssp(struct file *file, char __user *buf,
1430 size_t count, loff_t *ppos)
1431{
1432 struct net *net = pde_data(file_inode(file));
1433 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1434 unsigned long p = *ppos;
1435 char tbuf[10];
1436 size_t len;
1437
1438 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1439 len = strlen(tbuf);
1440 if (p >= len)
1441 return 0;
1442 len -= p;
1443 if (len > count)
1444 len = count;
1445 if (copy_to_user(buf, (void *)(tbuf+p), len))
1446 return -EFAULT;
1447 *ppos += len;
1448 return len;
1449}
1450
1451static const struct proc_ops use_gss_proxy_proc_ops = {
1452 .proc_open = nonseekable_open,
1453 .proc_write = write_gssp,
1454 .proc_read = read_gssp,
1455};
1456
1457static int create_use_gss_proxy_proc_entry(struct net *net)
1458{
1459 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1460 struct proc_dir_entry **p = &sn->use_gssp_proc;
1461
1462 sn->use_gss_proxy = -1;
1463 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1464 sn->proc_net_rpc,
1465 &use_gss_proxy_proc_ops, net);
1466 if (!*p)
1467 return -ENOMEM;
1468 init_gssp_clnt(sn);
1469 return 0;
1470}
1471
1472static void destroy_use_gss_proxy_proc_entry(struct net *net)
1473{
1474 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1475
1476 if (sn->use_gssp_proc) {
1477 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1478 clear_gssp_clnt(sn);
1479 }
1480}
1481
1482static ssize_t read_gss_krb5_enctypes(struct file *file, char __user *buf,
1483 size_t count, loff_t *ppos)
1484{
1485 struct rpcsec_gss_oid oid = {
1486 .len = 9,
1487 .data = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02",
1488 };
1489 struct gss_api_mech *mech;
1490 ssize_t ret;
1491
1492 mech = gss_mech_get_by_OID(&oid);
1493 if (!mech)
1494 return 0;
1495 if (!mech->gm_upcall_enctypes) {
1496 gss_mech_put(mech);
1497 return 0;
1498 }
1499
1500 ret = simple_read_from_buffer(buf, count, ppos,
1501 mech->gm_upcall_enctypes,
1502 strlen(mech->gm_upcall_enctypes));
1503 gss_mech_put(mech);
1504 return ret;
1505}
1506
1507static const struct proc_ops gss_krb5_enctypes_proc_ops = {
1508 .proc_open = nonseekable_open,
1509 .proc_read = read_gss_krb5_enctypes,
1510};
1511
1512static int create_krb5_enctypes_proc_entry(struct net *net)
1513{
1514 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1515
1516 sn->gss_krb5_enctypes =
1517 proc_create_data("gss_krb5_enctypes", S_IFREG | 0444,
1518 sn->proc_net_rpc, &gss_krb5_enctypes_proc_ops,
1519 net);
1520 return sn->gss_krb5_enctypes ? 0 : -ENOMEM;
1521}
1522
1523static void destroy_krb5_enctypes_proc_entry(struct net *net)
1524{
1525 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1526
1527 if (sn->gss_krb5_enctypes)
1528 remove_proc_entry("gss_krb5_enctypes", sn->proc_net_rpc);
1529}
1530
1531#else /* CONFIG_PROC_FS */
1532
1533static int create_use_gss_proxy_proc_entry(struct net *net)
1534{
1535 return 0;
1536}
1537
1538static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1539
1540static int create_krb5_enctypes_proc_entry(struct net *net)
1541{
1542 return 0;
1543}
1544
1545static void destroy_krb5_enctypes_proc_entry(struct net *net) {}
1546
1547#endif /* CONFIG_PROC_FS */
1548
1549/*
1550 * The Call's credential body should contain a struct rpc_gss_cred_t.
1551 *
1552 * RFC 2203 Section 5
1553 *
1554 * struct rpc_gss_cred_t {
1555 * union switch (unsigned int version) {
1556 * case RPCSEC_GSS_VERS_1:
1557 * struct {
1558 * rpc_gss_proc_t gss_proc;
1559 * unsigned int seq_num;
1560 * rpc_gss_service_t service;
1561 * opaque handle<>;
1562 * } rpc_gss_cred_vers_1_t;
1563 * }
1564 * };
1565 */
1566static bool
1567svcauth_gss_decode_credbody(struct xdr_stream *xdr,
1568 struct rpc_gss_wire_cred *gc,
1569 __be32 **rpcstart)
1570{
1571 ssize_t handle_len;
1572 u32 body_len;
1573 __be32 *p;
1574
1575 p = xdr_inline_decode(xdr, XDR_UNIT);
1576 if (!p)
1577 return false;
1578 /*
1579 * start of rpc packet is 7 u32's back from here:
1580 * xid direction rpcversion prog vers proc flavour
1581 */
1582 *rpcstart = p - 7;
1583 body_len = be32_to_cpup(p);
1584 if (body_len > RPC_MAX_AUTH_SIZE)
1585 return false;
1586
1587 /* struct rpc_gss_cred_t */
1588 if (xdr_stream_decode_u32(xdr, &gc->gc_v) < 0)
1589 return false;
1590 if (xdr_stream_decode_u32(xdr, &gc->gc_proc) < 0)
1591 return false;
1592 if (xdr_stream_decode_u32(xdr, &gc->gc_seq) < 0)
1593 return false;
1594 if (xdr_stream_decode_u32(xdr, &gc->gc_svc) < 0)
1595 return false;
1596 handle_len = xdr_stream_decode_opaque_inline(xdr,
1597 (void **)&gc->gc_ctx.data,
1598 body_len);
1599 if (handle_len < 0)
1600 return false;
1601 if (body_len != XDR_UNIT * 5 + xdr_align_size(handle_len))
1602 return false;
1603
1604 gc->gc_ctx.len = handle_len;
1605 return true;
1606}
1607
1608/**
1609 * svcauth_gss_accept - Decode and validate incoming RPC_AUTH_GSS credential
1610 * @rqstp: RPC transaction
1611 *
1612 * Return values:
1613 * %SVC_OK: Success
1614 * %SVC_COMPLETE: GSS context lifetime event
1615 * %SVC_DENIED: Credential or verifier is not valid
1616 * %SVC_GARBAGE: Failed to decode credential or verifier
1617 * %SVC_CLOSE: Temporary failure
1618 *
1619 * The rqstp->rq_auth_stat field is also set (see RFCs 2203 and 5531).
1620 */
1621static enum svc_auth_status
1622svcauth_gss_accept(struct svc_rqst *rqstp)
1623{
1624 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1625 __be32 *rpcstart;
1626 struct rpc_gss_wire_cred *gc;
1627 struct rsc *rsci = NULL;
1628 int ret;
1629 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1630
1631 rqstp->rq_auth_stat = rpc_autherr_badcred;
1632 if (!svcdata)
1633 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1634 if (!svcdata)
1635 goto auth_err;
1636 rqstp->rq_auth_data = svcdata;
1637 svcdata->gsd_databody_offset = 0;
1638 svcdata->rsci = NULL;
1639 gc = &svcdata->clcred;
1640
1641 if (!svcauth_gss_decode_credbody(&rqstp->rq_arg_stream, gc, &rpcstart))
1642 goto auth_err;
1643 if (gc->gc_v != RPC_GSS_VERSION)
1644 goto auth_err;
1645
1646 switch (gc->gc_proc) {
1647 case RPC_GSS_PROC_INIT:
1648 case RPC_GSS_PROC_CONTINUE_INIT:
1649 if (rqstp->rq_proc != 0)
1650 goto auth_err;
1651 return svcauth_gss_proc_init(rqstp, gc);
1652 case RPC_GSS_PROC_DESTROY:
1653 if (rqstp->rq_proc != 0)
1654 goto auth_err;
1655 fallthrough;
1656 case RPC_GSS_PROC_DATA:
1657 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1658 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1659 if (!rsci)
1660 goto auth_err;
1661 switch (svcauth_gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1662 case SVC_OK:
1663 break;
1664 case SVC_DENIED:
1665 goto auth_err;
1666 case SVC_DROP:
1667 goto drop;
1668 }
1669 break;
1670 default:
1671 if (rqstp->rq_proc != 0)
1672 goto auth_err;
1673 rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1674 goto auth_err;
1675 }
1676
1677 /* now act upon the command: */
1678 switch (gc->gc_proc) {
1679 case RPC_GSS_PROC_DESTROY:
1680 if (!svcauth_gss_encode_verf(rqstp, rsci->mechctx, gc->gc_seq))
1681 goto auth_err;
1682 if (!svcxdr_set_accept_stat(rqstp))
1683 goto auth_err;
1684 /* Delete the entry from the cache_list and call cache_put */
1685 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1686 goto complete;
1687 case RPC_GSS_PROC_DATA:
1688 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1689 if (!svcauth_gss_encode_verf(rqstp, rsci->mechctx, gc->gc_seq))
1690 goto auth_err;
1691 if (!svcxdr_set_accept_stat(rqstp))
1692 goto auth_err;
1693 svcdata->gsd_databody_offset = xdr_stream_pos(&rqstp->rq_res_stream);
1694 rqstp->rq_cred = rsci->cred;
1695 get_group_info(rsci->cred.cr_group_info);
1696 rqstp->rq_auth_stat = rpc_autherr_badcred;
1697 switch (gc->gc_svc) {
1698 case RPC_GSS_SVC_NONE:
1699 break;
1700 case RPC_GSS_SVC_INTEGRITY:
1701 /* placeholders for body length and seq. number: */
1702 xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2);
1703 if (svcauth_gss_unwrap_integ(rqstp, gc->gc_seq,
1704 rsci->mechctx))
1705 goto garbage_args;
1706 svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE);
1707 break;
1708 case RPC_GSS_SVC_PRIVACY:
1709 /* placeholders for body length and seq. number: */
1710 xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2);
1711 if (svcauth_gss_unwrap_priv(rqstp, gc->gc_seq,
1712 rsci->mechctx))
1713 goto garbage_args;
1714 svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE * 2);
1715 break;
1716 default:
1717 goto auth_err;
1718 }
1719 svcdata->rsci = rsci;
1720 cache_get(&rsci->h);
1721 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1722 rsci->mechctx->mech_type,
1723 GSS_C_QOP_DEFAULT,
1724 gc->gc_svc);
1725 ret = SVC_OK;
1726 trace_rpcgss_svc_authenticate(rqstp, gc);
1727 goto out;
1728 }
1729garbage_args:
1730 ret = SVC_GARBAGE;
1731 goto out;
1732auth_err:
1733 xdr_truncate_encode(&rqstp->rq_res_stream, XDR_UNIT * 2);
1734 ret = SVC_DENIED;
1735 goto out;
1736complete:
1737 ret = SVC_COMPLETE;
1738 goto out;
1739drop:
1740 ret = SVC_CLOSE;
1741out:
1742 if (rsci)
1743 cache_put(&rsci->h, sn->rsc_cache);
1744 return ret;
1745}
1746
1747static u32
1748svcauth_gss_prepare_to_wrap(struct svc_rqst *rqstp, struct gss_svc_data *gsd)
1749{
1750 u32 offset;
1751
1752 /* Release can be called twice, but we only wrap once. */
1753 offset = gsd->gsd_databody_offset;
1754 gsd->gsd_databody_offset = 0;
1755
1756 /* AUTH_ERROR replies are not wrapped. */
1757 if (rqstp->rq_auth_stat != rpc_auth_ok)
1758 return 0;
1759
1760 /* Also don't wrap if the accept_stat is nonzero: */
1761 if (*rqstp->rq_accept_statp != rpc_success)
1762 return 0;
1763
1764 return offset;
1765}
1766
1767/*
1768 * RFC 2203, Section 5.3.2.2
1769 *
1770 * struct rpc_gss_integ_data {
1771 * opaque databody_integ<>;
1772 * opaque checksum<>;
1773 * };
1774 *
1775 * struct rpc_gss_data_t {
1776 * unsigned int seq_num;
1777 * proc_req_arg_t arg;
1778 * };
1779 *
1780 * The RPC Reply message has already been XDR-encoded. rq_res_stream
1781 * is now positioned so that the checksum can be written just past
1782 * the RPC Reply message.
1783 */
1784static int svcauth_gss_wrap_integ(struct svc_rqst *rqstp)
1785{
1786 struct gss_svc_data *gsd = rqstp->rq_auth_data;
1787 struct xdr_stream *xdr = &rqstp->rq_res_stream;
1788 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1789 struct xdr_buf *buf = xdr->buf;
1790 struct xdr_buf databody_integ;
1791 struct xdr_netobj checksum;
1792 u32 offset, maj_stat;
1793
1794 offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
1795 if (!offset)
1796 goto out;
1797
1798 if (xdr_buf_subsegment(buf, &databody_integ, offset + XDR_UNIT,
1799 buf->len - offset - XDR_UNIT))
1800 goto wrap_failed;
1801 /* Buffer space for these has already been reserved in
1802 * svcauth_gss_accept(). */
1803 if (xdr_encode_word(buf, offset, databody_integ.len))
1804 goto wrap_failed;
1805 if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
1806 goto wrap_failed;
1807
1808 checksum.data = gsd->gsd_scratch;
1809 maj_stat = gss_get_mic(gsd->rsci->mechctx, &databody_integ, &checksum);
1810 if (maj_stat != GSS_S_COMPLETE)
1811 goto bad_mic;
1812
1813 if (xdr_stream_encode_opaque(xdr, checksum.data, checksum.len) < 0)
1814 goto wrap_failed;
1815 xdr_commit_encode(xdr);
1816
1817out:
1818 return 0;
1819
1820bad_mic:
1821 trace_rpcgss_svc_get_mic(rqstp, maj_stat);
1822 return -EINVAL;
1823wrap_failed:
1824 trace_rpcgss_svc_wrap_failed(rqstp);
1825 return -EINVAL;
1826}
1827
1828/*
1829 * RFC 2203, Section 5.3.2.3
1830 *
1831 * struct rpc_gss_priv_data {
1832 * opaque databody_priv<>
1833 * };
1834 *
1835 * struct rpc_gss_data_t {
1836 * unsigned int seq_num;
1837 * proc_req_arg_t arg;
1838 * };
1839 *
1840 * gss_wrap() expands the size of the RPC message payload in the
1841 * response buffer. The main purpose of svcauth_gss_wrap_priv()
1842 * is to ensure there is adequate space in the response buffer to
1843 * avoid overflow during the wrap.
1844 */
1845static int svcauth_gss_wrap_priv(struct svc_rqst *rqstp)
1846{
1847 struct gss_svc_data *gsd = rqstp->rq_auth_data;
1848 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1849 struct xdr_buf *buf = &rqstp->rq_res;
1850 struct kvec *head = buf->head;
1851 struct kvec *tail = buf->tail;
1852 u32 offset, pad, maj_stat;
1853 __be32 *p;
1854
1855 offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
1856 if (!offset)
1857 return 0;
1858
1859 /*
1860 * Buffer space for this field has already been reserved
1861 * in svcauth_gss_accept(). Note that the GSS sequence
1862 * number is encrypted along with the RPC reply payload.
1863 */
1864 if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
1865 goto wrap_failed;
1866
1867 /*
1868 * If there is currently tail data, make sure there is
1869 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1870 * the page, and move the current tail data such that
1871 * there is RPC_MAX_AUTH_SIZE slack space available in
1872 * both the head and tail.
1873 */
1874 if (tail->iov_base) {
1875 if (tail->iov_base >= head->iov_base + PAGE_SIZE)
1876 goto wrap_failed;
1877 if (tail->iov_base < head->iov_base)
1878 goto wrap_failed;
1879 if (tail->iov_len + head->iov_len
1880 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1881 goto wrap_failed;
1882 memmove(tail->iov_base + RPC_MAX_AUTH_SIZE, tail->iov_base,
1883 tail->iov_len);
1884 tail->iov_base += RPC_MAX_AUTH_SIZE;
1885 }
1886 /*
1887 * If there is no current tail data, make sure there is
1888 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1889 * allotted page, and set up tail information such that there
1890 * is RPC_MAX_AUTH_SIZE slack space available in both the
1891 * head and tail.
1892 */
1893 if (!tail->iov_base) {
1894 if (head->iov_len + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1895 goto wrap_failed;
1896 tail->iov_base = head->iov_base
1897 + head->iov_len + RPC_MAX_AUTH_SIZE;
1898 tail->iov_len = 0;
1899 }
1900
1901 maj_stat = gss_wrap(gsd->rsci->mechctx, offset + XDR_UNIT, buf,
1902 buf->pages);
1903 if (maj_stat != GSS_S_COMPLETE)
1904 goto bad_wrap;
1905
1906 /* Wrapping can change the size of databody_priv. */
1907 if (xdr_encode_word(buf, offset, buf->len - offset - XDR_UNIT))
1908 goto wrap_failed;
1909 pad = xdr_pad_size(buf->len - offset - XDR_UNIT);
1910 p = (__be32 *)(tail->iov_base + tail->iov_len);
1911 memset(p, 0, pad);
1912 tail->iov_len += pad;
1913 buf->len += pad;
1914
1915 return 0;
1916wrap_failed:
1917 trace_rpcgss_svc_wrap_failed(rqstp);
1918 return -EINVAL;
1919bad_wrap:
1920 trace_rpcgss_svc_wrap(rqstp, maj_stat);
1921 return -ENOMEM;
1922}
1923
1924/**
1925 * svcauth_gss_release - Wrap payload and release resources
1926 * @rqstp: RPC transaction context
1927 *
1928 * Return values:
1929 * %0: the Reply is ready to be sent
1930 * %-ENOMEM: failed to allocate memory
1931 * %-EINVAL: encoding error
1932 */
1933static int
1934svcauth_gss_release(struct svc_rqst *rqstp)
1935{
1936 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1937 struct gss_svc_data *gsd = rqstp->rq_auth_data;
1938 struct rpc_gss_wire_cred *gc;
1939 int stat;
1940
1941 if (!gsd)
1942 goto out;
1943 gc = &gsd->clcred;
1944 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1945 goto out;
1946
1947 switch (gc->gc_svc) {
1948 case RPC_GSS_SVC_NONE:
1949 break;
1950 case RPC_GSS_SVC_INTEGRITY:
1951 stat = svcauth_gss_wrap_integ(rqstp);
1952 if (stat)
1953 goto out_err;
1954 break;
1955 case RPC_GSS_SVC_PRIVACY:
1956 stat = svcauth_gss_wrap_priv(rqstp);
1957 if (stat)
1958 goto out_err;
1959 break;
1960 /*
1961 * For any other gc_svc value, svcauth_gss_accept() already set
1962 * the auth_error appropriately; just fall through:
1963 */
1964 }
1965
1966out:
1967 stat = 0;
1968out_err:
1969 if (rqstp->rq_client)
1970 auth_domain_put(rqstp->rq_client);
1971 rqstp->rq_client = NULL;
1972 if (rqstp->rq_gssclient)
1973 auth_domain_put(rqstp->rq_gssclient);
1974 rqstp->rq_gssclient = NULL;
1975 if (rqstp->rq_cred.cr_group_info)
1976 put_group_info(rqstp->rq_cred.cr_group_info);
1977 rqstp->rq_cred.cr_group_info = NULL;
1978 if (gsd && gsd->rsci) {
1979 cache_put(&gsd->rsci->h, sn->rsc_cache);
1980 gsd->rsci = NULL;
1981 }
1982 return stat;
1983}
1984
1985static void
1986svcauth_gss_domain_release_rcu(struct rcu_head *head)
1987{
1988 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1989 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1990
1991 kfree(dom->name);
1992 kfree(gd);
1993}
1994
1995static void
1996svcauth_gss_domain_release(struct auth_domain *dom)
1997{
1998 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1999}
2000
2001static rpc_authflavor_t svcauth_gss_pseudoflavor(struct svc_rqst *rqstp)
2002{
2003 return svcauth_gss_flavor(rqstp->rq_gssclient);
2004}
2005
2006static struct auth_ops svcauthops_gss = {
2007 .name = "rpcsec_gss",
2008 .owner = THIS_MODULE,
2009 .flavour = RPC_AUTH_GSS,
2010 .accept = svcauth_gss_accept,
2011 .release = svcauth_gss_release,
2012 .domain_release = svcauth_gss_domain_release,
2013 .set_client = svcauth_gss_set_client,
2014 .pseudoflavor = svcauth_gss_pseudoflavor,
2015};
2016
2017static int rsi_cache_create_net(struct net *net)
2018{
2019 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2020 struct cache_detail *cd;
2021 int err;
2022
2023 cd = cache_create_net(&rsi_cache_template, net);
2024 if (IS_ERR(cd))
2025 return PTR_ERR(cd);
2026 err = cache_register_net(cd, net);
2027 if (err) {
2028 cache_destroy_net(cd, net);
2029 return err;
2030 }
2031 sn->rsi_cache = cd;
2032 return 0;
2033}
2034
2035static void rsi_cache_destroy_net(struct net *net)
2036{
2037 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2038 struct cache_detail *cd = sn->rsi_cache;
2039
2040 sn->rsi_cache = NULL;
2041 cache_purge(cd);
2042 cache_unregister_net(cd, net);
2043 cache_destroy_net(cd, net);
2044}
2045
2046static int rsc_cache_create_net(struct net *net)
2047{
2048 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2049 struct cache_detail *cd;
2050 int err;
2051
2052 cd = cache_create_net(&rsc_cache_template, net);
2053 if (IS_ERR(cd))
2054 return PTR_ERR(cd);
2055 err = cache_register_net(cd, net);
2056 if (err) {
2057 cache_destroy_net(cd, net);
2058 return err;
2059 }
2060 sn->rsc_cache = cd;
2061 return 0;
2062}
2063
2064static void rsc_cache_destroy_net(struct net *net)
2065{
2066 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
2067 struct cache_detail *cd = sn->rsc_cache;
2068
2069 sn->rsc_cache = NULL;
2070 cache_purge(cd);
2071 cache_unregister_net(cd, net);
2072 cache_destroy_net(cd, net);
2073}
2074
2075int
2076gss_svc_init_net(struct net *net)
2077{
2078 int rv;
2079
2080 rv = rsc_cache_create_net(net);
2081 if (rv)
2082 return rv;
2083 rv = rsi_cache_create_net(net);
2084 if (rv)
2085 goto out1;
2086 rv = create_use_gss_proxy_proc_entry(net);
2087 if (rv)
2088 goto out2;
2089
2090 rv = create_krb5_enctypes_proc_entry(net);
2091 if (rv)
2092 goto out3;
2093
2094 return 0;
2095
2096out3:
2097 destroy_use_gss_proxy_proc_entry(net);
2098out2:
2099 rsi_cache_destroy_net(net);
2100out1:
2101 rsc_cache_destroy_net(net);
2102 return rv;
2103}
2104
2105void
2106gss_svc_shutdown_net(struct net *net)
2107{
2108 destroy_krb5_enctypes_proc_entry(net);
2109 destroy_use_gss_proxy_proc_entry(net);
2110 rsi_cache_destroy_net(net);
2111 rsc_cache_destroy_net(net);
2112}
2113
2114int
2115gss_svc_init(void)
2116{
2117 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
2118}
2119
2120void
2121gss_svc_shutdown(void)
2122{
2123 svc_auth_unregister(RPC_AUTH_GSS);
2124}