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(objp: rsii->in_handle.data);
112 kfree(objp: rsii->in_token.data);
113 kfree(objp: rsii->out_handle.data);
114 kfree(objp: 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(objp: 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(head: &rsii->rcu_head, func: rsi_free_rcu);
130}
131
132static inline int rsi_hash(struct rsi *item)
133{
134 return hash_mem(buf: item->in_handle.data, length: item->in_handle.len, RSI_HASHBITS)
135 ^ hash_mem(buf: item->in_token.data, length: 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(a: &item->in_handle, b: &tmp->in_handle) &&
143 netobj_equal(a: &item->in_token, b: &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: src->data, len: 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(detail: 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, lp: blen, buf: rsii->in_handle.data, blen: rsii->in_handle.len);
219 qword_addhex(bpp, lp: blen, buf: rsii->in_token.data, blen: 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(s: &rsii, c: 0, n: sizeof(rsii));
237 /* handle */
238 len = qword_get(bpp: &mesg, dest: buf, bufsize: mlen);
239 if (len < 0)
240 goto out;
241 status = -ENOMEM;
242 if (dup_to_netobj(dst: &rsii.in_handle, src: buf, len))
243 goto out;
244
245 /* token */
246 len = qword_get(bpp: &mesg, dest: buf, bufsize: mlen);
247 status = -EINVAL;
248 if (len < 0)
249 goto out;
250 status = -ENOMEM;
251 if (dup_to_netobj(dst: &rsii.in_token, src: buf, len))
252 goto out;
253
254 rsip = rsi_lookup(cd, item: &rsii);
255 if (!rsip)
256 goto out;
257
258 rsii.h.flags = 0;
259 /* expiry */
260 status = get_expiry(bpp: &mesg, rvp: &expiry);
261 if (status)
262 goto out;
263
264 status = -EINVAL;
265 /* major/minor */
266 len = qword_get(bpp: &mesg, dest: buf, bufsize: 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(bpp: &mesg, dest: buf, bufsize: 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(bpp: &mesg, dest: buf, bufsize: mlen);
281 if (len < 0)
282 goto out;
283 status = -ENOMEM;
284 if (dup_to_netobj(dst: &rsii.out_handle, src: buf, len))
285 goto out;
286
287 /* out_token */
288 len = qword_get(bpp: &mesg, dest: buf, bufsize: mlen);
289 status = -EINVAL;
290 if (len < 0)
291 goto out;
292 status = -ENOMEM;
293 if (dup_to_netobj(dst: &rsii.out_token, src: buf, len))
294 goto out;
295 rsii.h.expiry_time = expiry;
296 rsip = rsi_update(cd, new: &rsii, old: rsip);
297 status = 0;
298out:
299 rsi_free(rsii: &rsii);
300 if (rsip)
301 cache_put(h: &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(detail: cd, key: &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(item: new);
337
338 ch = sunrpc_cache_update(detail: cd, new: &new->h,
339 old: &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(objp: rsci->handle.data);
383 if (rsci->mechctx)
384 gss_delete_sec_context(ctx_id: &rsci->mechctx);
385 free_svc_cred(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(objp: rsci->handle.data);
393 kfree(objp: 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(ctx_id: &rsci->mechctx);
402 free_svc_cred(cred: &rsci->cred);
403 call_rcu(head: &rsci->rcu_head, func: rsc_free_rcu);
404}
405
406static inline int
407rsc_hash(struct rsc *rsci)
408{
409 return hash_mem(buf: rsci->handle.data, length: 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(a: &new->handle, b: &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(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(s: &new->seqdata, c: 0, n: sizeof(new->seqdata));
444 spin_lock_init(&new->seqdata.sd_lock);
445 new->cred = tmp->cred;
446 init_svc_cred(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(s: &rsci, c: 0, n: sizeof(rsci));
477 /* context handle */
478 len = qword_get(bpp: &mesg, dest: buf, bufsize: mlen);
479 if (len < 0) goto out;
480 status = -ENOMEM;
481 if (dup_to_netobj(dst: &rsci.handle, src: buf, len))
482 goto out;
483
484 rsci.h.flags = 0;
485 /* expiry */
486 status = get_expiry(bpp: &mesg, rvp: &expiry);
487 if (status)
488 goto out;
489
490 status = -EINVAL;
491 rscp = rsc_lookup(cd, item: &rsci);
492 if (!rscp)
493 goto out;
494
495 /* uid, or NEGATIVE */
496 rv = get_int(bpp: &mesg, anint: &id);
497 if (rv == -EINVAL)
498 goto out;
499 if (rv == -ENOENT)
500 set_bit(nr: CACHE_NEGATIVE, addr: &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(from: current_user_ns(), uid: id);
514
515 /* gid */
516 if (get_int(bpp: &mesg, anint: &id))
517 goto out;
518 rsci.cred.cr_gid = make_kgid(from: current_user_ns(), gid: id);
519
520 /* number of additional gid's */
521 if (get_int(bpp: &mesg, anint: &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(bpp: &mesg, anint: &id))
535 goto out;
536 kgid = make_kgid(from: current_user_ns(), gid: id);
537 if (!gid_valid(gid: 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(bpp: &mesg, dest: buf, bufsize: 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(bpp: &mesg, dest: buf, bufsize: mlen);
555 if (len < 0)
556 goto out;
557 status = gss_import_sec_context(input_token: buf, bufsize: len, mech: gm, ctx_id: &rsci.mechctx,
558 NULL, GFP_KERNEL);
559 if (status)
560 goto out;
561
562 /* get client name */
563 len = qword_get(bpp: &mesg, dest: buf, bufsize: mlen);
564 if (len > 0) {
565 rsci.cred.cr_principal = kstrdup(s: 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, new: &rsci, old: rscp);
575 status = 0;
576out:
577 rsc_free(rsci: &rsci);
578 if (rscp)
579 cache_put(h: &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(rsci: item);
602
603 ch = sunrpc_cache_lookup_rcu(detail: cd, key: &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(rsci: new);
614
615 ch = sunrpc_cache_update(detail: cd, new: &new->h,
616 old: &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(s: &rsci, c: 0, n: sizeof(rsci));
631 if (dup_to_netobj(dst: &rsci.handle, src: handle->data, len: handle->len))
632 return NULL;
633 found = rsc_lookup(cd, item: &rsci);
634 rsc_free(rsci: &rsci);
635 if (!found)
636 return NULL;
637 if (cache_check(detail: cd, h: &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(lock: &sd->sd_lock);
662 if (seq_num > sd->sd_max) {
663 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
664 memset(s: sd->sd_win, c: 0, n: 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(lock: &sd->sd_lock);
682 return result;
683
684toolow:
685 trace_rpcgss_svc_seqno_low(rqstp, seqno: seq_num,
686 min: sd->sd_max - GSS_SEQ_WIN,
687 max: sd->sd_max);
688 goto out;
689alreadyseen:
690 trace_rpcgss_svc_seqno_seen(rqstp, seqno: 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: &flavor,
722 body: (void **)&checksum.data,
723 body_len: &checksum.len) < 0) {
724 rqstp->rq_auth_stat = rpc_autherr_badverf;
725 return SVC_DENIED;
726 }
727 if (flavor != RPC_AUTH_GSS || checksum.len < XDR_UNIT) {
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, message: &rpchdr, mic_token: &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, seqno: gc->gc_seq);
743 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
744 return SVC_DENIED;
745 }
746 if (!gss_check_seq_num(rqstp, rsci, seq_num: 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, message: &verf_data, mic_token: &checksum);
772 if (maj_stat != GSS_S_COMPLETE)
773 goto bad_mic;
774
775 return xdr_stream_encode_opaque_auth(xdr: &rqstp->rq_res_stream, flavor: RPC_AUTH_GSS,
776 body: checksum.data, body_len: 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, service: 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(kref: &new->h.ref);
821 new->h.name = kstrdup(s: 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: &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(item: test);
833 goto out_free_name;
834 }
835 return test;
836
837out_free_name:
838 kfree(objp: new->h.name);
839out_free_dom:
840 kfree(objp: new);
841out:
842 return ERR_PTR(error: 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, ptr: &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_id: ctx, message: &databody_integ, mic_token: &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, ptr: &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, expected: seq, received: 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, ptr: &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_id: ctx, offset, len: offset + len, inbuf: 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, ptr: &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, expected: seq, received: 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(ctx: rsci->mechctx, svc: 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, handle: 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, ctx_id: rsci->mechctx, seq: seq_num);
1027 cache_put(h: &rsci->h, cd);
1028 return rc;
1029
1030null_verifier:
1031 return xdr_stream_encode_opaque_auth(xdr, flavor: RPC_AUTH_NULL, NULL, body_len: 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(page: in_token->pages[i++]);
1041 kfree(objp: 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(dst: in_handle, src: &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, ptr: &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]), from: xdr->p, len: 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 len: length);
1103
1104 to_offs += length;
1105 from_offs += length;
1106 inlen -= length;
1107 }
1108 return 0;
1109
1110out_denied_free:
1111 kfree(objp: 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, ptr: handle->data, len: handle->len) < 0)
1134 return false;
1135 if (xdr_stream_encode_u32(xdr, n: major_status) < 0)
1136 return false;
1137 if (xdr_stream_encode_u32(xdr, n: minor_status) < 0)
1138 return false;
1139 if (xdr_stream_encode_u32(xdr, n: seq_num) < 0)
1140 return false;
1141 if (xdr_stream_encode_opaque(xdr, ptr: gss_token->data, len: 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), id: sunrpc_net_id);
1163
1164 memset(s: &rsikey, c: 0, n: sizeof(rsikey));
1165 if (dup_netobj(dst: &rsikey.in_handle, src: &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, ptr: &len) < 0) {
1176 kfree(objp: rsikey.in_handle.data);
1177 return SVC_DENIED;
1178 }
1179 p = xdr_inline_decode(xdr, nbytes: len);
1180 if (!p) {
1181 kfree(objp: 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(objp: rsikey.in_handle.data);
1187 return SVC_CLOSE;
1188 }
1189 memcpy(to: rsikey.in_token.data, from: p, len);
1190 rsikey.in_token.len = len;
1191
1192 /* Perform upcall, or find upcall result: */
1193 rsip = rsi_lookup(cd: sn->rsi_cache, item: &rsikey);
1194 rsi_free(rsii: &rsikey);
1195 if (!rsip)
1196 return SVC_CLOSE;
1197 if (cache_check(detail: sn->rsi_cache, h: &rsip->h, rqstp: &rqstp->rq_chandle) < 0)
1198 /* No upcall result: */
1199 return SVC_CLOSE;
1200
1201 ret = SVC_CLOSE;
1202 if (!svcauth_gss_proc_init_verf(cd: sn->rsc_cache, rqstp, out_handle: &rsip->out_handle,
1203 major_status: &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(xdr: &rqstp->rq_res_stream, handle: &rsip->out_handle,
1208 gss_token: &rsip->out_token, major_status: rsip->major_status,
1209 minor_status: rsip->minor_status, GSS_SEQ_WIN))
1210 goto out;
1211
1212 ret = SVC_COMPLETE;
1213out:
1214 cache_put(h: &rsip->h, cd: 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(s: &rsci, c: 0, n: 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(v: &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(dst: &rsci.handle, src: (char *)handle, len: sizeof(uint64_t)))
1241 goto out;
1242 rscp = rsc_lookup(cd, item: &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(s: &ud->creds, c: 0, n: 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(input_token: ud->out_handle.data,
1268 bufsize: ud->out_handle.len,
1269 mech: gm, ctx_id: &rsci.mechctx,
1270 endtime: &expiry, GFP_KERNEL);
1271 if (status)
1272 goto out;
1273
1274 getboottime64(ts: &boot);
1275 expiry -= boot.tv_sec;
1276 }
1277
1278 rsci.h.expiry_time = expiry;
1279 rscp = rsc_update(cd, new: &rsci, old: rscp);
1280 status = 0;
1281out:
1282 rsc_free(rsci: &rsci);
1283 if (rscp)
1284 cache_put(h: &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, id: sunrpc_net_id);
1300
1301 memset(s: &ud, c: 0, n: sizeof(ud));
1302 ret = gss_read_proxy_verf(rqstp, gc, in_handle: &ud.in_handle, in_token: &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, data: &ud);
1310 if (status)
1311 goto out;
1312
1313 trace_rpcgss_svc_accept_upcall(rqstp, major_status: ud.major_status, minor_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(cd: sn->rsc_cache, ud: &ud, handle: &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(cd: sn->rsc_cache, rqstp, out_handle: &cli_handle,
1331 major_status: &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(xdr: &rqstp->rq_res_stream, handle: &cli_handle,
1336 gss_token: &ud.out_token, major_status: ud.major_status,
1337 minor_status: ud.minor_status, GSS_SEQ_WIN))
1338 goto out;
1339
1340 ret = SVC_COMPLETE;
1341out:
1342 gss_free_in_token_pages(in_token: &ud.in_token);
1343 gssp_free_upcall_data(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, id: 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, id: 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, type: 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: &flavor, body: &body, body_len: &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(inode: file_inode(f: 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(to: tbuf, from: buf, n: count))
1412 return -EFAULT;
1413
1414 tbuf[count] = 0;
1415 res = kstrtoul(s: tbuf, base: 0, res: &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, type: 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(inode: file_inode(f: file));
1433 struct sunrpc_net *sn = net_generic(net, id: sunrpc_net_id);
1434 unsigned long p = *ppos;
1435 char tbuf[10];
1436 size_t len;
1437
1438 snprintf(buf: tbuf, size: sizeof(tbuf), fmt: "%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(to: buf, from: (void *)(tbuf+p), n: 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, id: 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, id: 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(to: buf, count, ppos,
1501 from: mech->gm_upcall_enctypes,
1502 available: 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, id: 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, id: 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, ptr: &gc->gc_v) < 0)
1589 return false;
1590 if (xdr_stream_decode_u32(xdr, ptr: &gc->gc_proc) < 0)
1591 return false;
1592 if (xdr_stream_decode_u32(xdr, ptr: &gc->gc_seq) < 0)
1593 return false;
1594 if (xdr_stream_decode_u32(xdr, ptr: &gc->gc_svc) < 0)
1595 return false;
1596 handle_len = xdr_stream_decode_opaque_inline(xdr,
1597 ptr: (void **)&gc->gc_ctx.data,
1598 maxlen: body_len);
1599 if (handle_len < 0)
1600 return false;
1601 if (body_len != XDR_UNIT * 5 + xdr_align_size(n: 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), id: sunrpc_net_id);
1630
1631 rqstp->rq_auth_stat = rpc_autherr_failed;
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 rqstp->rq_auth_stat = rpc_autherr_badcred;
1642 if (!svcauth_gss_decode_credbody(xdr: &rqstp->rq_arg_stream, gc, rpcstart: &rpcstart))
1643 goto auth_err;
1644 if (gc->gc_v != RPC_GSS_VERSION)
1645 goto auth_err;
1646
1647 switch (gc->gc_proc) {
1648 case RPC_GSS_PROC_INIT:
1649 case RPC_GSS_PROC_CONTINUE_INIT:
1650 if (rqstp->rq_proc != 0)
1651 goto auth_err;
1652 return svcauth_gss_proc_init(rqstp, gc);
1653 case RPC_GSS_PROC_DESTROY:
1654 if (rqstp->rq_proc != 0)
1655 goto auth_err;
1656 fallthrough;
1657 case RPC_GSS_PROC_DATA:
1658 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1659 rsci = gss_svc_searchbyctx(cd: sn->rsc_cache, handle: &gc->gc_ctx);
1660 if (!rsci)
1661 goto auth_err;
1662 switch (svcauth_gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1663 case SVC_OK:
1664 break;
1665 case SVC_DENIED:
1666 goto auth_err;
1667 case SVC_DROP:
1668 goto drop;
1669 }
1670 break;
1671 default:
1672 if (rqstp->rq_proc != 0)
1673 goto auth_err;
1674 rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1675 goto auth_err;
1676 }
1677
1678 /* now act upon the command: */
1679 switch (gc->gc_proc) {
1680 case RPC_GSS_PROC_DESTROY:
1681 if (!svcauth_gss_encode_verf(rqstp, ctx_id: rsci->mechctx, seq: gc->gc_seq))
1682 goto auth_err;
1683 if (!svcxdr_set_accept_stat(rqstp))
1684 goto auth_err;
1685 /* Delete the entry from the cache_list and call cache_put */
1686 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1687 goto complete;
1688 case RPC_GSS_PROC_DATA:
1689 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1690 if (!svcauth_gss_encode_verf(rqstp, ctx_id: rsci->mechctx, seq: gc->gc_seq))
1691 goto auth_err;
1692 if (!svcxdr_set_accept_stat(rqstp))
1693 goto auth_err;
1694 svcdata->gsd_databody_offset = xdr_stream_pos(xdr: &rqstp->rq_res_stream);
1695 rqstp->rq_cred = rsci->cred;
1696 get_group_info(gi: rsci->cred.cr_group_info);
1697 rqstp->rq_auth_stat = rpc_autherr_badcred;
1698 switch (gc->gc_svc) {
1699 case RPC_GSS_SVC_NONE:
1700 break;
1701 case RPC_GSS_SVC_INTEGRITY:
1702 /* placeholders for body length and seq. number: */
1703 xdr_reserve_space(xdr: &rqstp->rq_res_stream, XDR_UNIT * 2);
1704 if (svcauth_gss_unwrap_integ(rqstp, seq: gc->gc_seq,
1705 ctx: rsci->mechctx))
1706 goto garbage_args;
1707 svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE);
1708 break;
1709 case RPC_GSS_SVC_PRIVACY:
1710 /* placeholders for body length and seq. number: */
1711 xdr_reserve_space(xdr: &rqstp->rq_res_stream, XDR_UNIT * 2);
1712 if (svcauth_gss_unwrap_priv(rqstp, seq: gc->gc_seq,
1713 ctx: rsci->mechctx))
1714 goto garbage_args;
1715 svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE * 2);
1716 break;
1717 default:
1718 goto auth_err;
1719 }
1720 svcdata->rsci = rsci;
1721 cache_get(h: &rsci->h);
1722 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1723 rsci->mechctx->mech_type,
1724 GSS_C_QOP_DEFAULT,
1725 service: gc->gc_svc);
1726 ret = SVC_OK;
1727 trace_rpcgss_svc_authenticate(rqstp, gc);
1728 goto out;
1729 }
1730garbage_args:
1731 ret = SVC_GARBAGE;
1732 goto out;
1733auth_err:
1734 xdr_truncate_encode(xdr: &rqstp->rq_res_stream, XDR_UNIT * 2);
1735 ret = SVC_DENIED;
1736 goto out;
1737complete:
1738 ret = SVC_COMPLETE;
1739 goto out;
1740drop:
1741 ret = SVC_CLOSE;
1742out:
1743 if (rsci)
1744 cache_put(h: &rsci->h, cd: sn->rsc_cache);
1745 return ret;
1746}
1747
1748static u32
1749svcauth_gss_prepare_to_wrap(struct svc_rqst *rqstp, struct gss_svc_data *gsd)
1750{
1751 u32 offset;
1752
1753 /* Release can be called twice, but we only wrap once. */
1754 offset = gsd->gsd_databody_offset;
1755 gsd->gsd_databody_offset = 0;
1756
1757 /* AUTH_ERROR replies are not wrapped. */
1758 if (rqstp->rq_auth_stat != rpc_auth_ok)
1759 return 0;
1760
1761 /* Also don't wrap if the accept_stat is nonzero: */
1762 if (*rqstp->rq_accept_statp != rpc_success)
1763 return 0;
1764
1765 return offset;
1766}
1767
1768/*
1769 * RFC 2203, Section 5.3.2.2
1770 *
1771 * struct rpc_gss_integ_data {
1772 * opaque databody_integ<>;
1773 * opaque checksum<>;
1774 * };
1775 *
1776 * struct rpc_gss_data_t {
1777 * unsigned int seq_num;
1778 * proc_req_arg_t arg;
1779 * };
1780 *
1781 * The RPC Reply message has already been XDR-encoded. rq_res_stream
1782 * is now positioned so that the checksum can be written just past
1783 * the RPC Reply message.
1784 */
1785static int svcauth_gss_wrap_integ(struct svc_rqst *rqstp)
1786{
1787 struct gss_svc_data *gsd = rqstp->rq_auth_data;
1788 struct xdr_stream *xdr = &rqstp->rq_res_stream;
1789 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1790 struct xdr_buf *buf = xdr->buf;
1791 struct xdr_buf databody_integ;
1792 struct xdr_netobj checksum;
1793 u32 offset, maj_stat;
1794
1795 offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
1796 if (!offset)
1797 goto out;
1798
1799 if (xdr_buf_subsegment(buf, &databody_integ, offset + XDR_UNIT,
1800 buf->len - offset - XDR_UNIT))
1801 goto wrap_failed;
1802 /* Buffer space for these has already been reserved in
1803 * svcauth_gss_accept(). */
1804 if (xdr_encode_word(buf, offset, databody_integ.len))
1805 goto wrap_failed;
1806 if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
1807 goto wrap_failed;
1808
1809 checksum.data = gsd->gsd_scratch;
1810 maj_stat = gss_get_mic(ctx_id: gsd->rsci->mechctx, message: &databody_integ, mic_token: &checksum);
1811 if (maj_stat != GSS_S_COMPLETE)
1812 goto bad_mic;
1813
1814 if (xdr_stream_encode_opaque(xdr, ptr: checksum.data, len: checksum.len) < 0)
1815 goto wrap_failed;
1816 xdr_commit_encode(xdr);
1817
1818out:
1819 return 0;
1820
1821bad_mic:
1822 trace_rpcgss_svc_get_mic(rqstp, maj_stat);
1823 return -EINVAL;
1824wrap_failed:
1825 trace_rpcgss_svc_wrap_failed(rqstp);
1826 return -EINVAL;
1827}
1828
1829/*
1830 * RFC 2203, Section 5.3.2.3
1831 *
1832 * struct rpc_gss_priv_data {
1833 * opaque databody_priv<>
1834 * };
1835 *
1836 * struct rpc_gss_data_t {
1837 * unsigned int seq_num;
1838 * proc_req_arg_t arg;
1839 * };
1840 *
1841 * gss_wrap() expands the size of the RPC message payload in the
1842 * response buffer. The main purpose of svcauth_gss_wrap_priv()
1843 * is to ensure there is adequate space in the response buffer to
1844 * avoid overflow during the wrap.
1845 */
1846static int svcauth_gss_wrap_priv(struct svc_rqst *rqstp)
1847{
1848 struct gss_svc_data *gsd = rqstp->rq_auth_data;
1849 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1850 struct xdr_buf *buf = &rqstp->rq_res;
1851 struct kvec *head = buf->head;
1852 struct kvec *tail = buf->tail;
1853 u32 offset, pad, maj_stat;
1854 __be32 *p;
1855
1856 offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
1857 if (!offset)
1858 return 0;
1859
1860 /*
1861 * Buffer space for this field has already been reserved
1862 * in svcauth_gss_accept(). Note that the GSS sequence
1863 * number is encrypted along with the RPC reply payload.
1864 */
1865 if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
1866 goto wrap_failed;
1867
1868 /*
1869 * If there is currently tail data, make sure there is
1870 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1871 * the page, and move the current tail data such that
1872 * there is RPC_MAX_AUTH_SIZE slack space available in
1873 * both the head and tail.
1874 */
1875 if (tail->iov_base) {
1876 if (tail->iov_base >= head->iov_base + PAGE_SIZE)
1877 goto wrap_failed;
1878 if (tail->iov_base < head->iov_base)
1879 goto wrap_failed;
1880 if (tail->iov_len + head->iov_len
1881 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1882 goto wrap_failed;
1883 memmove(dest: tail->iov_base + RPC_MAX_AUTH_SIZE, src: tail->iov_base,
1884 count: tail->iov_len);
1885 tail->iov_base += RPC_MAX_AUTH_SIZE;
1886 }
1887 /*
1888 * If there is no current tail data, make sure there is
1889 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1890 * allotted page, and set up tail information such that there
1891 * is RPC_MAX_AUTH_SIZE slack space available in both the
1892 * head and tail.
1893 */
1894 if (!tail->iov_base) {
1895 if (head->iov_len + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1896 goto wrap_failed;
1897 tail->iov_base = head->iov_base
1898 + head->iov_len + RPC_MAX_AUTH_SIZE;
1899 tail->iov_len = 0;
1900 }
1901
1902 maj_stat = gss_wrap(ctx_id: gsd->rsci->mechctx, offset: offset + XDR_UNIT, outbuf: buf,
1903 inpages: buf->pages);
1904 if (maj_stat != GSS_S_COMPLETE)
1905 goto bad_wrap;
1906
1907 /* Wrapping can change the size of databody_priv. */
1908 if (xdr_encode_word(buf, offset, buf->len - offset - XDR_UNIT))
1909 goto wrap_failed;
1910 pad = xdr_pad_size(n: buf->len - offset - XDR_UNIT);
1911 p = (__be32 *)(tail->iov_base + tail->iov_len);
1912 memset(s: p, c: 0, n: pad);
1913 tail->iov_len += pad;
1914 buf->len += pad;
1915
1916 return 0;
1917wrap_failed:
1918 trace_rpcgss_svc_wrap_failed(rqstp);
1919 return -EINVAL;
1920bad_wrap:
1921 trace_rpcgss_svc_wrap(rqstp, maj_stat);
1922 return -ENOMEM;
1923}
1924
1925/**
1926 * svcauth_gss_release - Wrap payload and release resources
1927 * @rqstp: RPC transaction context
1928 *
1929 * Return values:
1930 * %0: the Reply is ready to be sent
1931 * %-ENOMEM: failed to allocate memory
1932 * %-EINVAL: encoding error
1933 */
1934static int
1935svcauth_gss_release(struct svc_rqst *rqstp)
1936{
1937 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), id: sunrpc_net_id);
1938 struct gss_svc_data *gsd = rqstp->rq_auth_data;
1939 struct rpc_gss_wire_cred *gc;
1940 int stat;
1941
1942 if (!gsd)
1943 goto out;
1944 gc = &gsd->clcred;
1945 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1946 goto out;
1947
1948 switch (gc->gc_svc) {
1949 case RPC_GSS_SVC_NONE:
1950 break;
1951 case RPC_GSS_SVC_INTEGRITY:
1952 stat = svcauth_gss_wrap_integ(rqstp);
1953 if (stat)
1954 goto out_err;
1955 break;
1956 case RPC_GSS_SVC_PRIVACY:
1957 stat = svcauth_gss_wrap_priv(rqstp);
1958 if (stat)
1959 goto out_err;
1960 break;
1961 /*
1962 * For any other gc_svc value, svcauth_gss_accept() already set
1963 * the auth_error appropriately; just fall through:
1964 */
1965 }
1966
1967out:
1968 stat = 0;
1969out_err:
1970 if (rqstp->rq_client)
1971 auth_domain_put(item: rqstp->rq_client);
1972 rqstp->rq_client = NULL;
1973 if (rqstp->rq_gssclient)
1974 auth_domain_put(item: rqstp->rq_gssclient);
1975 rqstp->rq_gssclient = NULL;
1976 if (rqstp->rq_cred.cr_group_info)
1977 put_group_info(rqstp->rq_cred.cr_group_info);
1978 rqstp->rq_cred.cr_group_info = NULL;
1979 if (gsd && gsd->rsci) {
1980 cache_put(h: &gsd->rsci->h, cd: sn->rsc_cache);
1981 gsd->rsci = NULL;
1982 }
1983 return stat;
1984}
1985
1986static void
1987svcauth_gss_domain_release_rcu(struct rcu_head *head)
1988{
1989 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1990 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1991
1992 kfree(objp: dom->name);
1993 kfree(objp: gd);
1994}
1995
1996static void
1997svcauth_gss_domain_release(struct auth_domain *dom)
1998{
1999 call_rcu(head: &dom->rcu_head, func: svcauth_gss_domain_release_rcu);
2000}
2001
2002static rpc_authflavor_t svcauth_gss_pseudoflavor(struct svc_rqst *rqstp)
2003{
2004 return svcauth_gss_flavor(rqstp->rq_gssclient);
2005}
2006
2007static struct auth_ops svcauthops_gss = {
2008 .name = "rpcsec_gss",
2009 .owner = THIS_MODULE,
2010 .flavour = RPC_AUTH_GSS,
2011 .accept = svcauth_gss_accept,
2012 .release = svcauth_gss_release,
2013 .domain_release = svcauth_gss_domain_release,
2014 .set_client = svcauth_gss_set_client,
2015 .pseudoflavor = svcauth_gss_pseudoflavor,
2016};
2017
2018static int rsi_cache_create_net(struct net *net)
2019{
2020 struct sunrpc_net *sn = net_generic(net, id: sunrpc_net_id);
2021 struct cache_detail *cd;
2022 int err;
2023
2024 cd = cache_create_net(tmpl: &rsi_cache_template, net);
2025 if (IS_ERR(ptr: cd))
2026 return PTR_ERR(ptr: cd);
2027 err = cache_register_net(cd, net);
2028 if (err) {
2029 cache_destroy_net(cd, net);
2030 return err;
2031 }
2032 sn->rsi_cache = cd;
2033 return 0;
2034}
2035
2036static void rsi_cache_destroy_net(struct net *net)
2037{
2038 struct sunrpc_net *sn = net_generic(net, id: sunrpc_net_id);
2039 struct cache_detail *cd = sn->rsi_cache;
2040
2041 sn->rsi_cache = NULL;
2042 cache_purge(detail: cd);
2043 cache_unregister_net(cd, net);
2044 cache_destroy_net(cd, net);
2045}
2046
2047static int rsc_cache_create_net(struct net *net)
2048{
2049 struct sunrpc_net *sn = net_generic(net, id: sunrpc_net_id);
2050 struct cache_detail *cd;
2051 int err;
2052
2053 cd = cache_create_net(tmpl: &rsc_cache_template, net);
2054 if (IS_ERR(ptr: cd))
2055 return PTR_ERR(ptr: cd);
2056 err = cache_register_net(cd, net);
2057 if (err) {
2058 cache_destroy_net(cd, net);
2059 return err;
2060 }
2061 sn->rsc_cache = cd;
2062 return 0;
2063}
2064
2065static void rsc_cache_destroy_net(struct net *net)
2066{
2067 struct sunrpc_net *sn = net_generic(net, id: sunrpc_net_id);
2068 struct cache_detail *cd = sn->rsc_cache;
2069
2070 sn->rsc_cache = NULL;
2071 cache_purge(detail: cd);
2072 cache_unregister_net(cd, net);
2073 cache_destroy_net(cd, net);
2074}
2075
2076int
2077gss_svc_init_net(struct net *net)
2078{
2079 int rv;
2080
2081 rv = rsc_cache_create_net(net);
2082 if (rv)
2083 return rv;
2084 rv = rsi_cache_create_net(net);
2085 if (rv)
2086 goto out1;
2087 rv = create_use_gss_proxy_proc_entry(net);
2088 if (rv)
2089 goto out2;
2090
2091 rv = create_krb5_enctypes_proc_entry(net);
2092 if (rv)
2093 goto out3;
2094
2095 return 0;
2096
2097out3:
2098 destroy_use_gss_proxy_proc_entry(net);
2099out2:
2100 rsi_cache_destroy_net(net);
2101out1:
2102 rsc_cache_destroy_net(net);
2103 return rv;
2104}
2105
2106void
2107gss_svc_shutdown_net(struct net *net)
2108{
2109 destroy_krb5_enctypes_proc_entry(net);
2110 destroy_use_gss_proxy_proc_entry(net);
2111 rsi_cache_destroy_net(net);
2112 rsc_cache_destroy_net(net);
2113}
2114
2115int
2116gss_svc_init(void)
2117{
2118 return svc_auth_register(flavor: RPC_AUTH_GSS, aops: &svcauthops_gss);
2119}
2120
2121void
2122gss_svc_shutdown(void)
2123{
2124 svc_auth_unregister(flavor: RPC_AUTH_GSS);
2125}
2126