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1/*
2 * Neil Brown <neilb@cse.unsw.edu.au>
3 * J. Bruce Fields <bfields@umich.edu>
4 * Andy Adamson <andros@umich.edu>
5 * Dug Song <dugsong@monkey.org>
6 *
7 * RPCSEC_GSS server authentication.
8 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
9 * (gssapi)
10 *
11 * The RPCSEC_GSS involves three stages:
12 * 1/ context creation
13 * 2/ data exchange
14 * 3/ context destruction
15 *
16 * Context creation is handled largely by upcalls to user-space.
17 * In particular, GSS_Accept_sec_context is handled by an upcall
18 * Data exchange is handled entirely within the kernel
19 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
20 * Context destruction is handled in-kernel
21 * GSS_Delete_sec_context is in-kernel
22 *
23 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
24 * The context handle and gss_token are used as a key into the rpcsec_init cache.
25 * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
26 * being major_status, minor_status, context_handle, reply_token.
27 * These are sent back to the client.
28 * Sequence window management is handled by the kernel. The window size if currently
29 * a compile time constant.
30 *
31 * When user-space is happy that a context is established, it places an entry
32 * in the rpcsec_context cache. The key for this cache is the context_handle.
33 * The content includes:
34 * uid/gidlist - for determining access rights
35 * mechanism type
36 * mechanism specific information, such as a key
37 *
38 */
39
40#include <linux/slab.h>
41#include <linux/types.h>
42#include <linux/module.h>
43#include <linux/pagemap.h>
44#include <linux/user_namespace.h>
45
46#include <linux/sunrpc/auth_gss.h>
47#include <linux/sunrpc/gss_err.h>
48#include <linux/sunrpc/svcauth.h>
49#include <linux/sunrpc/svcauth_gss.h>
50#include <linux/sunrpc/cache.h>
51
52#include "../netns.h"
53
54#ifdef RPC_DEBUG
55# define RPCDBG_FACILITY RPCDBG_AUTH
56#endif
57
58/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
59 * into replies.
60 *
61 * Key is context handle (\x if empty) and gss_token.
62 * Content is major_status minor_status (integers) context_handle, reply_token.
63 *
64 */
65
66static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
67{
68 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
69}
70
71#define RSI_HASHBITS 6
72#define RSI_HASHMAX (1<<RSI_HASHBITS)
73
74struct rsi {
75 struct cache_head h;
76 struct xdr_netobj in_handle, in_token;
77 struct xdr_netobj out_handle, out_token;
78 int major_status, minor_status;
79};
80
81static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
82static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
83
84static void rsi_free(struct rsi *rsii)
85{
86 kfree(rsii->in_handle.data);
87 kfree(rsii->in_token.data);
88 kfree(rsii->out_handle.data);
89 kfree(rsii->out_token.data);
90}
91
92static void rsi_put(struct kref *ref)
93{
94 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
95 rsi_free(rsii);
96 kfree(rsii);
97}
98
99static inline int rsi_hash(struct rsi *item)
100{
101 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
102 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
103}
104
105static int rsi_match(struct cache_head *a, struct cache_head *b)
106{
107 struct rsi *item = container_of(a, struct rsi, h);
108 struct rsi *tmp = container_of(b, struct rsi, h);
109 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
110 netobj_equal(&item->in_token, &tmp->in_token);
111}
112
113static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
114{
115 dst->len = len;
116 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
117 if (len && !dst->data)
118 return -ENOMEM;
119 return 0;
120}
121
122static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
123{
124 return dup_to_netobj(dst, src->data, src->len);
125}
126
127static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
128{
129 struct rsi *new = container_of(cnew, struct rsi, h);
130 struct rsi *item = container_of(citem, struct rsi, h);
131
132 new->out_handle.data = NULL;
133 new->out_handle.len = 0;
134 new->out_token.data = NULL;
135 new->out_token.len = 0;
136 new->in_handle.len = item->in_handle.len;
137 item->in_handle.len = 0;
138 new->in_token.len = item->in_token.len;
139 item->in_token.len = 0;
140 new->in_handle.data = item->in_handle.data;
141 item->in_handle.data = NULL;
142 new->in_token.data = item->in_token.data;
143 item->in_token.data = NULL;
144}
145
146static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
147{
148 struct rsi *new = container_of(cnew, struct rsi, h);
149 struct rsi *item = container_of(citem, struct rsi, h);
150
151 BUG_ON(new->out_handle.data || new->out_token.data);
152 new->out_handle.len = item->out_handle.len;
153 item->out_handle.len = 0;
154 new->out_token.len = item->out_token.len;
155 item->out_token.len = 0;
156 new->out_handle.data = item->out_handle.data;
157 item->out_handle.data = NULL;
158 new->out_token.data = item->out_token.data;
159 item->out_token.data = NULL;
160
161 new->major_status = item->major_status;
162 new->minor_status = item->minor_status;
163}
164
165static struct cache_head *rsi_alloc(void)
166{
167 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
168 if (rsii)
169 return &rsii->h;
170 else
171 return NULL;
172}
173
174static void rsi_request(struct cache_detail *cd,
175 struct cache_head *h,
176 char **bpp, int *blen)
177{
178 struct rsi *rsii = container_of(h, struct rsi, h);
179
180 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
181 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
182 (*bpp)[-1] = '\n';
183}
184
185static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
186{
187 return sunrpc_cache_pipe_upcall(cd, h, rsi_request);
188}
189
190
191static int rsi_parse(struct cache_detail *cd,
192 char *mesg, int mlen)
193{
194 /* context token expiry major minor context token */
195 char *buf = mesg;
196 char *ep;
197 int len;
198 struct rsi rsii, *rsip = NULL;
199 time_t expiry;
200 int status = -EINVAL;
201
202 memset(&rsii, 0, sizeof(rsii));
203 /* handle */
204 len = qword_get(&mesg, buf, mlen);
205 if (len < 0)
206 goto out;
207 status = -ENOMEM;
208 if (dup_to_netobj(&rsii.in_handle, buf, len))
209 goto out;
210
211 /* token */
212 len = qword_get(&mesg, buf, mlen);
213 status = -EINVAL;
214 if (len < 0)
215 goto out;
216 status = -ENOMEM;
217 if (dup_to_netobj(&rsii.in_token, buf, len))
218 goto out;
219
220 rsip = rsi_lookup(cd, &rsii);
221 if (!rsip)
222 goto out;
223
224 rsii.h.flags = 0;
225 /* expiry */
226 expiry = get_expiry(&mesg);
227 status = -EINVAL;
228 if (expiry == 0)
229 goto out;
230
231 /* major/minor */
232 len = qword_get(&mesg, buf, mlen);
233 if (len <= 0)
234 goto out;
235 rsii.major_status = simple_strtoul(buf, &ep, 10);
236 if (*ep)
237 goto out;
238 len = qword_get(&mesg, buf, mlen);
239 if (len <= 0)
240 goto out;
241 rsii.minor_status = simple_strtoul(buf, &ep, 10);
242 if (*ep)
243 goto out;
244
245 /* out_handle */
246 len = qword_get(&mesg, buf, mlen);
247 if (len < 0)
248 goto out;
249 status = -ENOMEM;
250 if (dup_to_netobj(&rsii.out_handle, buf, len))
251 goto out;
252
253 /* out_token */
254 len = qword_get(&mesg, buf, mlen);
255 status = -EINVAL;
256 if (len < 0)
257 goto out;
258 status = -ENOMEM;
259 if (dup_to_netobj(&rsii.out_token, buf, len))
260 goto out;
261 rsii.h.expiry_time = expiry;
262 rsip = rsi_update(cd, &rsii, rsip);
263 status = 0;
264out:
265 rsi_free(&rsii);
266 if (rsip)
267 cache_put(&rsip->h, cd);
268 else
269 status = -ENOMEM;
270 return status;
271}
272
273static struct cache_detail rsi_cache_template = {
274 .owner = THIS_MODULE,
275 .hash_size = RSI_HASHMAX,
276 .name = "auth.rpcsec.init",
277 .cache_put = rsi_put,
278 .cache_upcall = rsi_upcall,
279 .cache_parse = rsi_parse,
280 .match = rsi_match,
281 .init = rsi_init,
282 .update = update_rsi,
283 .alloc = rsi_alloc,
284};
285
286static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
287{
288 struct cache_head *ch;
289 int hash = rsi_hash(item);
290
291 ch = sunrpc_cache_lookup(cd, &item->h, hash);
292 if (ch)
293 return container_of(ch, struct rsi, h);
294 else
295 return NULL;
296}
297
298static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
299{
300 struct cache_head *ch;
301 int hash = rsi_hash(new);
302
303 ch = sunrpc_cache_update(cd, &new->h,
304 &old->h, hash);
305 if (ch)
306 return container_of(ch, struct rsi, h);
307 else
308 return NULL;
309}
310
311
312/*
313 * The rpcsec_context cache is used to store a context that is
314 * used in data exchange.
315 * The key is a context handle. The content is:
316 * uid, gidlist, mechanism, service-set, mech-specific-data
317 */
318
319#define RSC_HASHBITS 10
320#define RSC_HASHMAX (1<<RSC_HASHBITS)
321
322#define GSS_SEQ_WIN 128
323
324struct gss_svc_seq_data {
325 /* highest seq number seen so far: */
326 int sd_max;
327 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
328 * sd_win is nonzero iff sequence number i has been seen already: */
329 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
330 spinlock_t sd_lock;
331};
332
333struct rsc {
334 struct cache_head h;
335 struct xdr_netobj handle;
336 struct svc_cred cred;
337 struct gss_svc_seq_data seqdata;
338 struct gss_ctx *mechctx;
339};
340
341static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
342static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
343
344static void rsc_free(struct rsc *rsci)
345{
346 kfree(rsci->handle.data);
347 if (rsci->mechctx)
348 gss_delete_sec_context(&rsci->mechctx);
349 free_svc_cred(&rsci->cred);
350}
351
352static void rsc_put(struct kref *ref)
353{
354 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
355
356 rsc_free(rsci);
357 kfree(rsci);
358}
359
360static inline int
361rsc_hash(struct rsc *rsci)
362{
363 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
364}
365
366static int
367rsc_match(struct cache_head *a, struct cache_head *b)
368{
369 struct rsc *new = container_of(a, struct rsc, h);
370 struct rsc *tmp = container_of(b, struct rsc, h);
371
372 return netobj_equal(&new->handle, &tmp->handle);
373}
374
375static void
376rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
377{
378 struct rsc *new = container_of(cnew, struct rsc, h);
379 struct rsc *tmp = container_of(ctmp, struct rsc, h);
380
381 new->handle.len = tmp->handle.len;
382 tmp->handle.len = 0;
383 new->handle.data = tmp->handle.data;
384 tmp->handle.data = NULL;
385 new->mechctx = NULL;
386 new->cred.cr_group_info = NULL;
387 new->cred.cr_principal = NULL;
388}
389
390static void
391update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
392{
393 struct rsc *new = container_of(cnew, struct rsc, h);
394 struct rsc *tmp = container_of(ctmp, struct rsc, h);
395
396 new->mechctx = tmp->mechctx;
397 tmp->mechctx = NULL;
398 memset(&new->seqdata, 0, sizeof(new->seqdata));
399 spin_lock_init(&new->seqdata.sd_lock);
400 new->cred = tmp->cred;
401 tmp->cred.cr_group_info = NULL;
402 new->cred.cr_principal = tmp->cred.cr_principal;
403 tmp->cred.cr_principal = NULL;
404}
405
406static struct cache_head *
407rsc_alloc(void)
408{
409 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
410 if (rsci)
411 return &rsci->h;
412 else
413 return NULL;
414}
415
416static int rsc_parse(struct cache_detail *cd,
417 char *mesg, int mlen)
418{
419 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
420 char *buf = mesg;
421 int len, rv;
422 struct rsc rsci, *rscp = NULL;
423 time_t expiry;
424 int status = -EINVAL;
425 struct gss_api_mech *gm = NULL;
426
427 memset(&rsci, 0, sizeof(rsci));
428 /* context handle */
429 len = qword_get(&mesg, buf, mlen);
430 if (len < 0) goto out;
431 status = -ENOMEM;
432 if (dup_to_netobj(&rsci.handle, buf, len))
433 goto out;
434
435 rsci.h.flags = 0;
436 /* expiry */
437 expiry = get_expiry(&mesg);
438 status = -EINVAL;
439 if (expiry == 0)
440 goto out;
441
442 rscp = rsc_lookup(cd, &rsci);
443 if (!rscp)
444 goto out;
445
446 /* uid, or NEGATIVE */
447 rv = get_int(&mesg, &rsci.cred.cr_uid);
448 if (rv == -EINVAL)
449 goto out;
450 if (rv == -ENOENT)
451 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
452 else {
453 int N, i;
454
455 /* gid */
456 if (get_int(&mesg, &rsci.cred.cr_gid))
457 goto out;
458
459 /* number of additional gid's */
460 if (get_int(&mesg, &N))
461 goto out;
462 status = -ENOMEM;
463 rsci.cred.cr_group_info = groups_alloc(N);
464 if (rsci.cred.cr_group_info == NULL)
465 goto out;
466
467 /* gid's */
468 status = -EINVAL;
469 for (i=0; i<N; i++) {
470 gid_t gid;
471 kgid_t kgid;
472 if (get_int(&mesg, &gid))
473 goto out;
474 kgid = make_kgid(&init_user_ns, gid);
475 if (!gid_valid(kgid))
476 goto out;
477 GROUP_AT(rsci.cred.cr_group_info, i) = kgid;
478 }
479
480 /* mech name */
481 len = qword_get(&mesg, buf, mlen);
482 if (len < 0)
483 goto out;
484 gm = gss_mech_get_by_name(buf);
485 status = -EOPNOTSUPP;
486 if (!gm)
487 goto out;
488
489 status = -EINVAL;
490 /* mech-specific data: */
491 len = qword_get(&mesg, buf, mlen);
492 if (len < 0)
493 goto out;
494 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, GFP_KERNEL);
495 if (status)
496 goto out;
497
498 /* get client name */
499 len = qword_get(&mesg, buf, mlen);
500 if (len > 0) {
501 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
502 if (!rsci.cred.cr_principal)
503 goto out;
504 }
505
506 }
507 rsci.h.expiry_time = expiry;
508 rscp = rsc_update(cd, &rsci, rscp);
509 status = 0;
510out:
511 gss_mech_put(gm);
512 rsc_free(&rsci);
513 if (rscp)
514 cache_put(&rscp->h, cd);
515 else
516 status = -ENOMEM;
517 return status;
518}
519
520static struct cache_detail rsc_cache_template = {
521 .owner = THIS_MODULE,
522 .hash_size = RSC_HASHMAX,
523 .name = "auth.rpcsec.context",
524 .cache_put = rsc_put,
525 .cache_parse = rsc_parse,
526 .match = rsc_match,
527 .init = rsc_init,
528 .update = update_rsc,
529 .alloc = rsc_alloc,
530};
531
532static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
533{
534 struct cache_head *ch;
535 int hash = rsc_hash(item);
536
537 ch = sunrpc_cache_lookup(cd, &item->h, hash);
538 if (ch)
539 return container_of(ch, struct rsc, h);
540 else
541 return NULL;
542}
543
544static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
545{
546 struct cache_head *ch;
547 int hash = rsc_hash(new);
548
549 ch = sunrpc_cache_update(cd, &new->h,
550 &old->h, hash);
551 if (ch)
552 return container_of(ch, struct rsc, h);
553 else
554 return NULL;
555}
556
557
558static struct rsc *
559gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
560{
561 struct rsc rsci;
562 struct rsc *found;
563
564 memset(&rsci, 0, sizeof(rsci));
565 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
566 return NULL;
567 found = rsc_lookup(cd, &rsci);
568 rsc_free(&rsci);
569 if (!found)
570 return NULL;
571 if (cache_check(cd, &found->h, NULL))
572 return NULL;
573 return found;
574}
575
576/* Implements sequence number algorithm as specified in RFC 2203. */
577static int
578gss_check_seq_num(struct rsc *rsci, int seq_num)
579{
580 struct gss_svc_seq_data *sd = &rsci->seqdata;
581
582 spin_lock(&sd->sd_lock);
583 if (seq_num > sd->sd_max) {
584 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
585 memset(sd->sd_win,0,sizeof(sd->sd_win));
586 sd->sd_max = seq_num;
587 } else while (sd->sd_max < seq_num) {
588 sd->sd_max++;
589 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
590 }
591 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
592 goto ok;
593 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
594 goto drop;
595 }
596 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
597 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
598 goto drop;
599ok:
600 spin_unlock(&sd->sd_lock);
601 return 1;
602drop:
603 spin_unlock(&sd->sd_lock);
604 return 0;
605}
606
607static inline u32 round_up_to_quad(u32 i)
608{
609 return (i + 3 ) & ~3;
610}
611
612static inline int
613svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
614{
615 int l;
616
617 if (argv->iov_len < 4)
618 return -1;
619 o->len = svc_getnl(argv);
620 l = round_up_to_quad(o->len);
621 if (argv->iov_len < l)
622 return -1;
623 o->data = argv->iov_base;
624 argv->iov_base += l;
625 argv->iov_len -= l;
626 return 0;
627}
628
629static inline int
630svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
631{
632 u8 *p;
633
634 if (resv->iov_len + 4 > PAGE_SIZE)
635 return -1;
636 svc_putnl(resv, o->len);
637 p = resv->iov_base + resv->iov_len;
638 resv->iov_len += round_up_to_quad(o->len);
639 if (resv->iov_len > PAGE_SIZE)
640 return -1;
641 memcpy(p, o->data, o->len);
642 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
643 return 0;
644}
645
646/*
647 * Verify the checksum on the header and return SVC_OK on success.
648 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
649 * or return SVC_DENIED and indicate error in authp.
650 */
651static int
652gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
653 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
654{
655 struct gss_ctx *ctx_id = rsci->mechctx;
656 struct xdr_buf rpchdr;
657 struct xdr_netobj checksum;
658 u32 flavor = 0;
659 struct kvec *argv = &rqstp->rq_arg.head[0];
660 struct kvec iov;
661
662 /* data to compute the checksum over: */
663 iov.iov_base = rpcstart;
664 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
665 xdr_buf_from_iov(&iov, &rpchdr);
666
667 *authp = rpc_autherr_badverf;
668 if (argv->iov_len < 4)
669 return SVC_DENIED;
670 flavor = svc_getnl(argv);
671 if (flavor != RPC_AUTH_GSS)
672 return SVC_DENIED;
673 if (svc_safe_getnetobj(argv, &checksum))
674 return SVC_DENIED;
675
676 if (rqstp->rq_deferred) /* skip verification of revisited request */
677 return SVC_OK;
678 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
679 *authp = rpcsec_gsserr_credproblem;
680 return SVC_DENIED;
681 }
682
683 if (gc->gc_seq > MAXSEQ) {
684 dprintk("RPC: svcauth_gss: discarding request with "
685 "large sequence number %d\n", gc->gc_seq);
686 *authp = rpcsec_gsserr_ctxproblem;
687 return SVC_DENIED;
688 }
689 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
690 dprintk("RPC: svcauth_gss: discarding request with "
691 "old sequence number %d\n", gc->gc_seq);
692 return SVC_DROP;
693 }
694 return SVC_OK;
695}
696
697static int
698gss_write_null_verf(struct svc_rqst *rqstp)
699{
700 __be32 *p;
701
702 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
703 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
704 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
705 *p++ = 0;
706 if (!xdr_ressize_check(rqstp, p))
707 return -1;
708 return 0;
709}
710
711static int
712gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
713{
714 __be32 xdr_seq;
715 u32 maj_stat;
716 struct xdr_buf verf_data;
717 struct xdr_netobj mic;
718 __be32 *p;
719 struct kvec iov;
720
721 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
722 xdr_seq = htonl(seq);
723
724 iov.iov_base = &xdr_seq;
725 iov.iov_len = sizeof(xdr_seq);
726 xdr_buf_from_iov(&iov, &verf_data);
727 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
728 mic.data = (u8 *)(p + 1);
729 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
730 if (maj_stat != GSS_S_COMPLETE)
731 return -1;
732 *p++ = htonl(mic.len);
733 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
734 p += XDR_QUADLEN(mic.len);
735 if (!xdr_ressize_check(rqstp, p))
736 return -1;
737 return 0;
738}
739
740struct gss_domain {
741 struct auth_domain h;
742 u32 pseudoflavor;
743};
744
745static struct auth_domain *
746find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
747{
748 char *name;
749
750 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
751 if (!name)
752 return NULL;
753 return auth_domain_find(name);
754}
755
756static struct auth_ops svcauthops_gss;
757
758u32 svcauth_gss_flavor(struct auth_domain *dom)
759{
760 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
761
762 return gd->pseudoflavor;
763}
764
765EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
766
767int
768svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
769{
770 struct gss_domain *new;
771 struct auth_domain *test;
772 int stat = -ENOMEM;
773
774 new = kmalloc(sizeof(*new), GFP_KERNEL);
775 if (!new)
776 goto out;
777 kref_init(&new->h.ref);
778 new->h.name = kstrdup(name, GFP_KERNEL);
779 if (!new->h.name)
780 goto out_free_dom;
781 new->h.flavour = &svcauthops_gss;
782 new->pseudoflavor = pseudoflavor;
783
784 stat = 0;
785 test = auth_domain_lookup(name, &new->h);
786 if (test != &new->h) { /* Duplicate registration */
787 auth_domain_put(test);
788 kfree(new->h.name);
789 goto out_free_dom;
790 }
791 return 0;
792
793out_free_dom:
794 kfree(new);
795out:
796 return stat;
797}
798
799EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
800
801static inline int
802read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
803{
804 __be32 raw;
805 int status;
806
807 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
808 if (status)
809 return status;
810 *obj = ntohl(raw);
811 return 0;
812}
813
814/* It would be nice if this bit of code could be shared with the client.
815 * Obstacles:
816 * The client shouldn't malloc(), would have to pass in own memory.
817 * The server uses base of head iovec as read pointer, while the
818 * client uses separate pointer. */
819static int
820unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
821{
822 int stat = -EINVAL;
823 u32 integ_len, maj_stat;
824 struct xdr_netobj mic;
825 struct xdr_buf integ_buf;
826
827 integ_len = svc_getnl(&buf->head[0]);
828 if (integ_len & 3)
829 return stat;
830 if (integ_len > buf->len)
831 return stat;
832 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
833 BUG();
834 /* copy out mic... */
835 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
836 BUG();
837 if (mic.len > RPC_MAX_AUTH_SIZE)
838 return stat;
839 mic.data = kmalloc(mic.len, GFP_KERNEL);
840 if (!mic.data)
841 return stat;
842 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
843 goto out;
844 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
845 if (maj_stat != GSS_S_COMPLETE)
846 goto out;
847 if (svc_getnl(&buf->head[0]) != seq)
848 goto out;
849 stat = 0;
850out:
851 kfree(mic.data);
852 return stat;
853}
854
855static inline int
856total_buf_len(struct xdr_buf *buf)
857{
858 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
859}
860
861static void
862fix_priv_head(struct xdr_buf *buf, int pad)
863{
864 if (buf->page_len == 0) {
865 /* We need to adjust head and buf->len in tandem in this
866 * case to make svc_defer() work--it finds the original
867 * buffer start using buf->len - buf->head[0].iov_len. */
868 buf->head[0].iov_len -= pad;
869 }
870}
871
872static int
873unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
874{
875 u32 priv_len, maj_stat;
876 int pad, saved_len, remaining_len, offset;
877
878 rqstp->rq_splice_ok = 0;
879
880 priv_len = svc_getnl(&buf->head[0]);
881 if (rqstp->rq_deferred) {
882 /* Already decrypted last time through! The sequence number
883 * check at out_seq is unnecessary but harmless: */
884 goto out_seq;
885 }
886 /* buf->len is the number of bytes from the original start of the
887 * request to the end, where head[0].iov_len is just the bytes
888 * not yet read from the head, so these two values are different: */
889 remaining_len = total_buf_len(buf);
890 if (priv_len > remaining_len)
891 return -EINVAL;
892 pad = remaining_len - priv_len;
893 buf->len -= pad;
894 fix_priv_head(buf, pad);
895
896 /* Maybe it would be better to give gss_unwrap a length parameter: */
897 saved_len = buf->len;
898 buf->len = priv_len;
899 maj_stat = gss_unwrap(ctx, 0, buf);
900 pad = priv_len - buf->len;
901 buf->len = saved_len;
902 buf->len -= pad;
903 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
904 * In the krb5p case, at least, the data ends up offset, so we need to
905 * move it around. */
906 /* XXX: This is very inefficient. It would be better to either do
907 * this while we encrypt, or maybe in the receive code, if we can peak
908 * ahead and work out the service and mechanism there. */
909 offset = buf->head[0].iov_len % 4;
910 if (offset) {
911 buf->buflen = RPCSVC_MAXPAYLOAD;
912 xdr_shift_buf(buf, offset);
913 fix_priv_head(buf, pad);
914 }
915 if (maj_stat != GSS_S_COMPLETE)
916 return -EINVAL;
917out_seq:
918 if (svc_getnl(&buf->head[0]) != seq)
919 return -EINVAL;
920 return 0;
921}
922
923struct gss_svc_data {
924 /* decoded gss client cred: */
925 struct rpc_gss_wire_cred clcred;
926 /* save a pointer to the beginning of the encoded verifier,
927 * for use in encryption/checksumming in svcauth_gss_release: */
928 __be32 *verf_start;
929 struct rsc *rsci;
930};
931
932static int
933svcauth_gss_set_client(struct svc_rqst *rqstp)
934{
935 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
936 struct rsc *rsci = svcdata->rsci;
937 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
938 int stat;
939
940 /*
941 * A gss export can be specified either by:
942 * export *(sec=krb5,rw)
943 * or by
944 * export gss/krb5(rw)
945 * The latter is deprecated; but for backwards compatibility reasons
946 * the nfsd code will still fall back on trying it if the former
947 * doesn't work; so we try to make both available to nfsd, below.
948 */
949 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
950 if (rqstp->rq_gssclient == NULL)
951 return SVC_DENIED;
952 stat = svcauth_unix_set_client(rqstp);
953 if (stat == SVC_DROP || stat == SVC_CLOSE)
954 return stat;
955 return SVC_OK;
956}
957
958static inline int
959gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
960 struct xdr_netobj *out_handle, int *major_status)
961{
962 struct rsc *rsci;
963 int rc;
964
965 if (*major_status != GSS_S_COMPLETE)
966 return gss_write_null_verf(rqstp);
967 rsci = gss_svc_searchbyctx(cd, out_handle);
968 if (rsci == NULL) {
969 *major_status = GSS_S_NO_CONTEXT;
970 return gss_write_null_verf(rqstp);
971 }
972 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
973 cache_put(&rsci->h, cd);
974 return rc;
975}
976
977static inline int
978gss_read_verf(struct rpc_gss_wire_cred *gc,
979 struct kvec *argv, __be32 *authp,
980 struct xdr_netobj *in_handle,
981 struct xdr_netobj *in_token)
982{
983 struct xdr_netobj tmpobj;
984
985 /* Read the verifier; should be NULL: */
986 *authp = rpc_autherr_badverf;
987 if (argv->iov_len < 2 * 4)
988 return SVC_DENIED;
989 if (svc_getnl(argv) != RPC_AUTH_NULL)
990 return SVC_DENIED;
991 if (svc_getnl(argv) != 0)
992 return SVC_DENIED;
993 /* Martial context handle and token for upcall: */
994 *authp = rpc_autherr_badcred;
995 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
996 return SVC_DENIED;
997 if (dup_netobj(in_handle, &gc->gc_ctx))
998 return SVC_CLOSE;
999 *authp = rpc_autherr_badverf;
1000 if (svc_safe_getnetobj(argv, &tmpobj)) {
1001 kfree(in_handle->data);
1002 return SVC_DENIED;
1003 }
1004 if (dup_netobj(in_token, &tmpobj)) {
1005 kfree(in_handle->data);
1006 return SVC_CLOSE;
1007 }
1008
1009 return 0;
1010}
1011
1012static inline int
1013gss_write_resv(struct kvec *resv, size_t size_limit,
1014 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1015 int major_status, int minor_status)
1016{
1017 if (resv->iov_len + 4 > size_limit)
1018 return -1;
1019 svc_putnl(resv, RPC_SUCCESS);
1020 if (svc_safe_putnetobj(resv, out_handle))
1021 return -1;
1022 if (resv->iov_len + 3 * 4 > size_limit)
1023 return -1;
1024 svc_putnl(resv, major_status);
1025 svc_putnl(resv, minor_status);
1026 svc_putnl(resv, GSS_SEQ_WIN);
1027 if (svc_safe_putnetobj(resv, out_token))
1028 return -1;
1029 return 0;
1030}
1031
1032/*
1033 * Having read the cred already and found we're in the context
1034 * initiation case, read the verifier and initiate (or check the results
1035 * of) upcalls to userspace for help with context initiation. If
1036 * the upcall results are available, write the verifier and result.
1037 * Otherwise, drop the request pending an answer to the upcall.
1038 */
1039static int svcauth_gss_handle_init(struct svc_rqst *rqstp,
1040 struct rpc_gss_wire_cred *gc, __be32 *authp)
1041{
1042 struct kvec *argv = &rqstp->rq_arg.head[0];
1043 struct kvec *resv = &rqstp->rq_res.head[0];
1044 struct rsi *rsip, rsikey;
1045 int ret;
1046 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1047
1048 memset(&rsikey, 0, sizeof(rsikey));
1049 ret = gss_read_verf(gc, argv, authp,
1050 &rsikey.in_handle, &rsikey.in_token);
1051 if (ret)
1052 return ret;
1053
1054 /* Perform upcall, or find upcall result: */
1055 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1056 rsi_free(&rsikey);
1057 if (!rsip)
1058 return SVC_CLOSE;
1059 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1060 /* No upcall result: */
1061 return SVC_CLOSE;
1062
1063 ret = SVC_CLOSE;
1064 /* Got an answer to the upcall; use it: */
1065 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1066 &rsip->out_handle, &rsip->major_status))
1067 goto out;
1068 if (gss_write_resv(resv, PAGE_SIZE,
1069 &rsip->out_handle, &rsip->out_token,
1070 rsip->major_status, rsip->minor_status))
1071 goto out;
1072
1073 ret = SVC_COMPLETE;
1074out:
1075 cache_put(&rsip->h, sn->rsi_cache);
1076 return ret;
1077}
1078
1079/*
1080 * Accept an rpcsec packet.
1081 * If context establishment, punt to user space
1082 * If data exchange, verify/decrypt
1083 * If context destruction, handle here
1084 * In the context establishment and destruction case we encode
1085 * response here and return SVC_COMPLETE.
1086 */
1087static int
1088svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1089{
1090 struct kvec *argv = &rqstp->rq_arg.head[0];
1091 struct kvec *resv = &rqstp->rq_res.head[0];
1092 u32 crlen;
1093 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1094 struct rpc_gss_wire_cred *gc;
1095 struct rsc *rsci = NULL;
1096 __be32 *rpcstart;
1097 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1098 int ret;
1099 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1100
1101 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",
1102 argv->iov_len);
1103
1104 *authp = rpc_autherr_badcred;
1105 if (!svcdata)
1106 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1107 if (!svcdata)
1108 goto auth_err;
1109 rqstp->rq_auth_data = svcdata;
1110 svcdata->verf_start = NULL;
1111 svcdata->rsci = NULL;
1112 gc = &svcdata->clcred;
1113
1114 /* start of rpc packet is 7 u32's back from here:
1115 * xid direction rpcversion prog vers proc flavour
1116 */
1117 rpcstart = argv->iov_base;
1118 rpcstart -= 7;
1119
1120 /* credential is:
1121 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1122 * at least 5 u32s, and is preceded by length, so that makes 6.
1123 */
1124
1125 if (argv->iov_len < 5 * 4)
1126 goto auth_err;
1127 crlen = svc_getnl(argv);
1128 if (svc_getnl(argv) != RPC_GSS_VERSION)
1129 goto auth_err;
1130 gc->gc_proc = svc_getnl(argv);
1131 gc->gc_seq = svc_getnl(argv);
1132 gc->gc_svc = svc_getnl(argv);
1133 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1134 goto auth_err;
1135 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1136 goto auth_err;
1137
1138 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1139 goto auth_err;
1140
1141 *authp = rpc_autherr_badverf;
1142 switch (gc->gc_proc) {
1143 case RPC_GSS_PROC_INIT:
1144 case RPC_GSS_PROC_CONTINUE_INIT:
1145 return svcauth_gss_handle_init(rqstp, gc, authp);
1146 case RPC_GSS_PROC_DATA:
1147 case RPC_GSS_PROC_DESTROY:
1148 /* Look up the context, and check the verifier: */
1149 *authp = rpcsec_gsserr_credproblem;
1150 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1151 if (!rsci)
1152 goto auth_err;
1153 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1154 case SVC_OK:
1155 break;
1156 case SVC_DENIED:
1157 goto auth_err;
1158 case SVC_DROP:
1159 goto drop;
1160 }
1161 break;
1162 default:
1163 *authp = rpc_autherr_rejectedcred;
1164 goto auth_err;
1165 }
1166
1167 /* now act upon the command: */
1168 switch (gc->gc_proc) {
1169 case RPC_GSS_PROC_DESTROY:
1170 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1171 goto auth_err;
1172 rsci->h.expiry_time = get_seconds();
1173 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
1174 if (resv->iov_len + 4 > PAGE_SIZE)
1175 goto drop;
1176 svc_putnl(resv, RPC_SUCCESS);
1177 goto complete;
1178 case RPC_GSS_PROC_DATA:
1179 *authp = rpcsec_gsserr_ctxproblem;
1180 svcdata->verf_start = resv->iov_base + resv->iov_len;
1181 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1182 goto auth_err;
1183 rqstp->rq_cred = rsci->cred;
1184 get_group_info(rsci->cred.cr_group_info);
1185 *authp = rpc_autherr_badcred;
1186 switch (gc->gc_svc) {
1187 case RPC_GSS_SVC_NONE:
1188 break;
1189 case RPC_GSS_SVC_INTEGRITY:
1190 /* placeholders for length and seq. number: */
1191 svc_putnl(resv, 0);
1192 svc_putnl(resv, 0);
1193 if (unwrap_integ_data(&rqstp->rq_arg,
1194 gc->gc_seq, rsci->mechctx))
1195 goto garbage_args;
1196 break;
1197 case RPC_GSS_SVC_PRIVACY:
1198 /* placeholders for length and seq. number: */
1199 svc_putnl(resv, 0);
1200 svc_putnl(resv, 0);
1201 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1202 gc->gc_seq, rsci->mechctx))
1203 goto garbage_args;
1204 break;
1205 default:
1206 goto auth_err;
1207 }
1208 svcdata->rsci = rsci;
1209 cache_get(&rsci->h);
1210 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1211 rsci->mechctx->mech_type, gc->gc_svc);
1212 ret = SVC_OK;
1213 goto out;
1214 }
1215garbage_args:
1216 ret = SVC_GARBAGE;
1217 goto out;
1218auth_err:
1219 /* Restore write pointer to its original value: */
1220 xdr_ressize_check(rqstp, reject_stat);
1221 ret = SVC_DENIED;
1222 goto out;
1223complete:
1224 ret = SVC_COMPLETE;
1225 goto out;
1226drop:
1227 ret = SVC_DROP;
1228out:
1229 if (rsci)
1230 cache_put(&rsci->h, sn->rsc_cache);
1231 return ret;
1232}
1233
1234static __be32 *
1235svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1236{
1237 __be32 *p;
1238 u32 verf_len;
1239
1240 p = gsd->verf_start;
1241 gsd->verf_start = NULL;
1242
1243 /* If the reply stat is nonzero, don't wrap: */
1244 if (*(p-1) != rpc_success)
1245 return NULL;
1246 /* Skip the verifier: */
1247 p += 1;
1248 verf_len = ntohl(*p++);
1249 p += XDR_QUADLEN(verf_len);
1250 /* move accept_stat to right place: */
1251 memcpy(p, p + 2, 4);
1252 /* Also don't wrap if the accept stat is nonzero: */
1253 if (*p != rpc_success) {
1254 resbuf->head[0].iov_len -= 2 * 4;
1255 return NULL;
1256 }
1257 p++;
1258 return p;
1259}
1260
1261static inline int
1262svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1263{
1264 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1265 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1266 struct xdr_buf *resbuf = &rqstp->rq_res;
1267 struct xdr_buf integ_buf;
1268 struct xdr_netobj mic;
1269 struct kvec *resv;
1270 __be32 *p;
1271 int integ_offset, integ_len;
1272 int stat = -EINVAL;
1273
1274 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1275 if (p == NULL)
1276 goto out;
1277 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1278 integ_len = resbuf->len - integ_offset;
1279 BUG_ON(integ_len % 4);
1280 *p++ = htonl(integ_len);
1281 *p++ = htonl(gc->gc_seq);
1282 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset,
1283 integ_len))
1284 BUG();
1285 if (resbuf->tail[0].iov_base == NULL) {
1286 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1287 goto out_err;
1288 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1289 + resbuf->head[0].iov_len;
1290 resbuf->tail[0].iov_len = 0;
1291 resv = &resbuf->tail[0];
1292 } else {
1293 resv = &resbuf->tail[0];
1294 }
1295 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1296 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1297 goto out_err;
1298 svc_putnl(resv, mic.len);
1299 memset(mic.data + mic.len, 0,
1300 round_up_to_quad(mic.len) - mic.len);
1301 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1302 /* not strictly required: */
1303 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1304 BUG_ON(resv->iov_len > PAGE_SIZE);
1305out:
1306 stat = 0;
1307out_err:
1308 return stat;
1309}
1310
1311static inline int
1312svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1313{
1314 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1315 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1316 struct xdr_buf *resbuf = &rqstp->rq_res;
1317 struct page **inpages = NULL;
1318 __be32 *p, *len;
1319 int offset;
1320 int pad;
1321
1322 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1323 if (p == NULL)
1324 return 0;
1325 len = p++;
1326 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1327 *p++ = htonl(gc->gc_seq);
1328 inpages = resbuf->pages;
1329 /* XXX: Would be better to write some xdr helper functions for
1330 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1331
1332 /*
1333 * If there is currently tail data, make sure there is
1334 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1335 * the page, and move the current tail data such that
1336 * there is RPC_MAX_AUTH_SIZE slack space available in
1337 * both the head and tail.
1338 */
1339 if (resbuf->tail[0].iov_base) {
1340 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
1341 + PAGE_SIZE);
1342 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
1343 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1344 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1345 return -ENOMEM;
1346 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1347 resbuf->tail[0].iov_base,
1348 resbuf->tail[0].iov_len);
1349 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1350 }
1351 /*
1352 * If there is no current tail data, make sure there is
1353 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1354 * allotted page, and set up tail information such that there
1355 * is RPC_MAX_AUTH_SIZE slack space available in both the
1356 * head and tail.
1357 */
1358 if (resbuf->tail[0].iov_base == NULL) {
1359 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1360 return -ENOMEM;
1361 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1362 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1363 resbuf->tail[0].iov_len = 0;
1364 }
1365 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1366 return -ENOMEM;
1367 *len = htonl(resbuf->len - offset);
1368 pad = 3 - ((resbuf->len - offset - 1)&3);
1369 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1370 memset(p, 0, pad);
1371 resbuf->tail[0].iov_len += pad;
1372 resbuf->len += pad;
1373 return 0;
1374}
1375
1376static int
1377svcauth_gss_release(struct svc_rqst *rqstp)
1378{
1379 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1380 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1381 struct xdr_buf *resbuf = &rqstp->rq_res;
1382 int stat = -EINVAL;
1383 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1384
1385 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1386 goto out;
1387 /* Release can be called twice, but we only wrap once. */
1388 if (gsd->verf_start == NULL)
1389 goto out;
1390 /* normally not set till svc_send, but we need it here: */
1391 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1392 * or whatever? */
1393 resbuf->len = total_buf_len(resbuf);
1394 switch (gc->gc_svc) {
1395 case RPC_GSS_SVC_NONE:
1396 break;
1397 case RPC_GSS_SVC_INTEGRITY:
1398 stat = svcauth_gss_wrap_resp_integ(rqstp);
1399 if (stat)
1400 goto out_err;
1401 break;
1402 case RPC_GSS_SVC_PRIVACY:
1403 stat = svcauth_gss_wrap_resp_priv(rqstp);
1404 if (stat)
1405 goto out_err;
1406 break;
1407 /*
1408 * For any other gc_svc value, svcauth_gss_accept() already set
1409 * the auth_error appropriately; just fall through:
1410 */
1411 }
1412
1413out:
1414 stat = 0;
1415out_err:
1416 if (rqstp->rq_client)
1417 auth_domain_put(rqstp->rq_client);
1418 rqstp->rq_client = NULL;
1419 if (rqstp->rq_gssclient)
1420 auth_domain_put(rqstp->rq_gssclient);
1421 rqstp->rq_gssclient = NULL;
1422 if (rqstp->rq_cred.cr_group_info)
1423 put_group_info(rqstp->rq_cred.cr_group_info);
1424 rqstp->rq_cred.cr_group_info = NULL;
1425 if (gsd->rsci)
1426 cache_put(&gsd->rsci->h, sn->rsc_cache);
1427 gsd->rsci = NULL;
1428
1429 return stat;
1430}
1431
1432static void
1433svcauth_gss_domain_release(struct auth_domain *dom)
1434{
1435 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1436
1437 kfree(dom->name);
1438 kfree(gd);
1439}
1440
1441static struct auth_ops svcauthops_gss = {
1442 .name = "rpcsec_gss",
1443 .owner = THIS_MODULE,
1444 .flavour = RPC_AUTH_GSS,
1445 .accept = svcauth_gss_accept,
1446 .release = svcauth_gss_release,
1447 .domain_release = svcauth_gss_domain_release,
1448 .set_client = svcauth_gss_set_client,
1449};
1450
1451static int rsi_cache_create_net(struct net *net)
1452{
1453 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1454 struct cache_detail *cd;
1455 int err;
1456
1457 cd = cache_create_net(&rsi_cache_template, net);
1458 if (IS_ERR(cd))
1459 return PTR_ERR(cd);
1460 err = cache_register_net(cd, net);
1461 if (err) {
1462 cache_destroy_net(cd, net);
1463 return err;
1464 }
1465 sn->rsi_cache = cd;
1466 return 0;
1467}
1468
1469static void rsi_cache_destroy_net(struct net *net)
1470{
1471 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1472 struct cache_detail *cd = sn->rsi_cache;
1473
1474 sn->rsi_cache = NULL;
1475 cache_purge(cd);
1476 cache_unregister_net(cd, net);
1477 cache_destroy_net(cd, net);
1478}
1479
1480static int rsc_cache_create_net(struct net *net)
1481{
1482 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1483 struct cache_detail *cd;
1484 int err;
1485
1486 cd = cache_create_net(&rsc_cache_template, net);
1487 if (IS_ERR(cd))
1488 return PTR_ERR(cd);
1489 err = cache_register_net(cd, net);
1490 if (err) {
1491 cache_destroy_net(cd, net);
1492 return err;
1493 }
1494 sn->rsc_cache = cd;
1495 return 0;
1496}
1497
1498static void rsc_cache_destroy_net(struct net *net)
1499{
1500 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1501 struct cache_detail *cd = sn->rsc_cache;
1502
1503 sn->rsc_cache = NULL;
1504 cache_purge(cd);
1505 cache_unregister_net(cd, net);
1506 cache_destroy_net(cd, net);
1507}
1508
1509int
1510gss_svc_init_net(struct net *net)
1511{
1512 int rv;
1513
1514 rv = rsc_cache_create_net(net);
1515 if (rv)
1516 return rv;
1517 rv = rsi_cache_create_net(net);
1518 if (rv)
1519 goto out1;
1520 return 0;
1521out1:
1522 rsc_cache_destroy_net(net);
1523 return rv;
1524}
1525
1526void
1527gss_svc_shutdown_net(struct net *net)
1528{
1529 rsi_cache_destroy_net(net);
1530 rsc_cache_destroy_net(net);
1531}
1532
1533int
1534gss_svc_init(void)
1535{
1536 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1537}
1538
1539void
1540gss_svc_shutdown(void)
1541{
1542 svc_auth_unregister(RPC_AUTH_GSS);
1543}