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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#include "gss_rpc_upcall.h"
52
53
54#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
55# define RPCDBG_FACILITY RPCDBG_AUTH
56#endif
57
58
59
60
61
62
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_parse(struct cache_detail *cd,
186 char *mesg, int mlen)
187{
188
189 char *buf = mesg;
190 char *ep;
191 int len;
192 struct rsi rsii, *rsip = NULL;
193 time_t expiry;
194 int status = -EINVAL;
195
196 memset(&rsii, 0, sizeof(rsii));
197
198 len = qword_get(&mesg, buf, mlen);
199 if (len < 0)
200 goto out;
201 status = -ENOMEM;
202 if (dup_to_netobj(&rsii.in_handle, buf, len))
203 goto out;
204
205
206 len = qword_get(&mesg, buf, mlen);
207 status = -EINVAL;
208 if (len < 0)
209 goto out;
210 status = -ENOMEM;
211 if (dup_to_netobj(&rsii.in_token, buf, len))
212 goto out;
213
214 rsip = rsi_lookup(cd, &rsii);
215 if (!rsip)
216 goto out;
217
218 rsii.h.flags = 0;
219
220 expiry = get_expiry(&mesg);
221 status = -EINVAL;
222 if (expiry == 0)
223 goto out;
224
225
226 len = qword_get(&mesg, buf, mlen);
227 if (len <= 0)
228 goto out;
229 rsii.major_status = simple_strtoul(buf, &ep, 10);
230 if (*ep)
231 goto out;
232 len = qword_get(&mesg, buf, mlen);
233 if (len <= 0)
234 goto out;
235 rsii.minor_status = simple_strtoul(buf, &ep, 10);
236 if (*ep)
237 goto out;
238
239
240 len = qword_get(&mesg, buf, mlen);
241 if (len < 0)
242 goto out;
243 status = -ENOMEM;
244 if (dup_to_netobj(&rsii.out_handle, buf, len))
245 goto out;
246
247
248 len = qword_get(&mesg, buf, mlen);
249 status = -EINVAL;
250 if (len < 0)
251 goto out;
252 status = -ENOMEM;
253 if (dup_to_netobj(&rsii.out_token, buf, len))
254 goto out;
255 rsii.h.expiry_time = expiry;
256 rsip = rsi_update(cd, &rsii, rsip);
257 status = 0;
258out:
259 rsi_free(&rsii);
260 if (rsip)
261 cache_put(&rsip->h, cd);
262 else
263 status = -ENOMEM;
264 return status;
265}
266
267static const struct cache_detail rsi_cache_template = {
268 .owner = THIS_MODULE,
269 .hash_size = RSI_HASHMAX,
270 .name = "auth.rpcsec.init",
271 .cache_put = rsi_put,
272 .cache_request = rsi_request,
273 .cache_parse = rsi_parse,
274 .match = rsi_match,
275 .init = rsi_init,
276 .update = update_rsi,
277 .alloc = rsi_alloc,
278};
279
280static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
281{
282 struct cache_head *ch;
283 int hash = rsi_hash(item);
284
285 ch = sunrpc_cache_lookup(cd, &item->h, hash);
286 if (ch)
287 return container_of(ch, struct rsi, h);
288 else
289 return NULL;
290}
291
292static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
293{
294 struct cache_head *ch;
295 int hash = rsi_hash(new);
296
297 ch = sunrpc_cache_update(cd, &new->h,
298 &old->h, hash);
299 if (ch)
300 return container_of(ch, struct rsi, h);
301 else
302 return NULL;
303}
304
305
306
307
308
309
310
311
312
313#define RSC_HASHBITS 10
314#define RSC_HASHMAX (1<<RSC_HASHBITS)
315
316#define GSS_SEQ_WIN 128
317
318struct gss_svc_seq_data {
319
320 int sd_max;
321
322
323 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
324 spinlock_t sd_lock;
325};
326
327struct rsc {
328 struct cache_head h;
329 struct xdr_netobj handle;
330 struct svc_cred cred;
331 struct gss_svc_seq_data seqdata;
332 struct gss_ctx *mechctx;
333};
334
335static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
336static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
337
338static void rsc_free(struct rsc *rsci)
339{
340 kfree(rsci->handle.data);
341 if (rsci->mechctx)
342 gss_delete_sec_context(&rsci->mechctx);
343 free_svc_cred(&rsci->cred);
344}
345
346static void rsc_put(struct kref *ref)
347{
348 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
349
350 rsc_free(rsci);
351 kfree(rsci);
352}
353
354static inline int
355rsc_hash(struct rsc *rsci)
356{
357 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
358}
359
360static int
361rsc_match(struct cache_head *a, struct cache_head *b)
362{
363 struct rsc *new = container_of(a, struct rsc, h);
364 struct rsc *tmp = container_of(b, struct rsc, h);
365
366 return netobj_equal(&new->handle, &tmp->handle);
367}
368
369static void
370rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
371{
372 struct rsc *new = container_of(cnew, struct rsc, h);
373 struct rsc *tmp = container_of(ctmp, struct rsc, h);
374
375 new->handle.len = tmp->handle.len;
376 tmp->handle.len = 0;
377 new->handle.data = tmp->handle.data;
378 tmp->handle.data = NULL;
379 new->mechctx = NULL;
380 init_svc_cred(&new->cred);
381}
382
383static void
384update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
385{
386 struct rsc *new = container_of(cnew, struct rsc, h);
387 struct rsc *tmp = container_of(ctmp, struct rsc, h);
388
389 new->mechctx = tmp->mechctx;
390 tmp->mechctx = NULL;
391 memset(&new->seqdata, 0, sizeof(new->seqdata));
392 spin_lock_init(&new->seqdata.sd_lock);
393 new->cred = tmp->cred;
394 init_svc_cred(&tmp->cred);
395}
396
397static struct cache_head *
398rsc_alloc(void)
399{
400 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
401 if (rsci)
402 return &rsci->h;
403 else
404 return NULL;
405}
406
407static int rsc_parse(struct cache_detail *cd,
408 char *mesg, int mlen)
409{
410
411 char *buf = mesg;
412 int id;
413 int len, rv;
414 struct rsc rsci, *rscp = NULL;
415 time_t expiry;
416 int status = -EINVAL;
417 struct gss_api_mech *gm = NULL;
418
419 memset(&rsci, 0, sizeof(rsci));
420
421 len = qword_get(&mesg, buf, mlen);
422 if (len < 0) goto out;
423 status = -ENOMEM;
424 if (dup_to_netobj(&rsci.handle, buf, len))
425 goto out;
426
427 rsci.h.flags = 0;
428
429 expiry = get_expiry(&mesg);
430 status = -EINVAL;
431 if (expiry == 0)
432 goto out;
433
434 rscp = rsc_lookup(cd, &rsci);
435 if (!rscp)
436 goto out;
437
438
439 rv = get_int(&mesg, &id);
440 if (rv == -EINVAL)
441 goto out;
442 if (rv == -ENOENT)
443 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
444 else {
445 int N, i;
446
447
448
449
450
451
452
453
454
455
456 rsci.cred.cr_uid = make_kuid(&init_user_ns, id);
457
458
459 if (get_int(&mesg, &id))
460 goto out;
461 rsci.cred.cr_gid = make_kgid(&init_user_ns, id);
462
463
464 if (get_int(&mesg, &N))
465 goto out;
466 if (N < 0 || N > NGROUPS_MAX)
467 goto out;
468 status = -ENOMEM;
469 rsci.cred.cr_group_info = groups_alloc(N);
470 if (rsci.cred.cr_group_info == NULL)
471 goto out;
472
473
474 status = -EINVAL;
475 for (i=0; i<N; i++) {
476 kgid_t kgid;
477 if (get_int(&mesg, &id))
478 goto out;
479 kgid = make_kgid(&init_user_ns, id);
480 if (!gid_valid(kgid))
481 goto out;
482 rsci.cred.cr_group_info->gid[i] = kgid;
483 }
484 groups_sort(rsci.cred.cr_group_info);
485
486
487 len = qword_get(&mesg, buf, mlen);
488 if (len < 0)
489 goto out;
490 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
491 status = -EOPNOTSUPP;
492 if (!gm)
493 goto out;
494
495 status = -EINVAL;
496
497 len = qword_get(&mesg, buf, mlen);
498 if (len < 0)
499 goto out;
500 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
501 NULL, GFP_KERNEL);
502 if (status)
503 goto out;
504
505
506 len = qword_get(&mesg, buf, mlen);
507 if (len > 0) {
508 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
509 if (!rsci.cred.cr_principal) {
510 status = -ENOMEM;
511 goto out;
512 }
513 }
514
515 }
516 rsci.h.expiry_time = expiry;
517 rscp = rsc_update(cd, &rsci, rscp);
518 status = 0;
519out:
520 rsc_free(&rsci);
521 if (rscp)
522 cache_put(&rscp->h, cd);
523 else
524 status = -ENOMEM;
525 return status;
526}
527
528static const struct cache_detail rsc_cache_template = {
529 .owner = THIS_MODULE,
530 .hash_size = RSC_HASHMAX,
531 .name = "auth.rpcsec.context",
532 .cache_put = rsc_put,
533 .cache_parse = rsc_parse,
534 .match = rsc_match,
535 .init = rsc_init,
536 .update = update_rsc,
537 .alloc = rsc_alloc,
538};
539
540static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
541{
542 struct cache_head *ch;
543 int hash = rsc_hash(item);
544
545 ch = sunrpc_cache_lookup(cd, &item->h, hash);
546 if (ch)
547 return container_of(ch, struct rsc, h);
548 else
549 return NULL;
550}
551
552static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
553{
554 struct cache_head *ch;
555 int hash = rsc_hash(new);
556
557 ch = sunrpc_cache_update(cd, &new->h,
558 &old->h, hash);
559 if (ch)
560 return container_of(ch, struct rsc, h);
561 else
562 return NULL;
563}
564
565
566static struct rsc *
567gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
568{
569 struct rsc rsci;
570 struct rsc *found;
571
572 memset(&rsci, 0, sizeof(rsci));
573 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
574 return NULL;
575 found = rsc_lookup(cd, &rsci);
576 rsc_free(&rsci);
577 if (!found)
578 return NULL;
579 if (cache_check(cd, &found->h, NULL))
580 return NULL;
581 return found;
582}
583
584
585static int
586gss_check_seq_num(struct rsc *rsci, int seq_num)
587{
588 struct gss_svc_seq_data *sd = &rsci->seqdata;
589
590 spin_lock(&sd->sd_lock);
591 if (seq_num > sd->sd_max) {
592 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
593 memset(sd->sd_win,0,sizeof(sd->sd_win));
594 sd->sd_max = seq_num;
595 } else while (sd->sd_max < seq_num) {
596 sd->sd_max++;
597 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
598 }
599 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
600 goto ok;
601 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
602 goto drop;
603 }
604
605 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
606 goto drop;
607ok:
608 spin_unlock(&sd->sd_lock);
609 return 1;
610drop:
611 spin_unlock(&sd->sd_lock);
612 return 0;
613}
614
615static inline u32 round_up_to_quad(u32 i)
616{
617 return (i + 3 ) & ~3;
618}
619
620static inline int
621svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
622{
623 int l;
624
625 if (argv->iov_len < 4)
626 return -1;
627 o->len = svc_getnl(argv);
628 l = round_up_to_quad(o->len);
629 if (argv->iov_len < l)
630 return -1;
631 o->data = argv->iov_base;
632 argv->iov_base += l;
633 argv->iov_len -= l;
634 return 0;
635}
636
637static inline int
638svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
639{
640 u8 *p;
641
642 if (resv->iov_len + 4 > PAGE_SIZE)
643 return -1;
644 svc_putnl(resv, o->len);
645 p = resv->iov_base + resv->iov_len;
646 resv->iov_len += round_up_to_quad(o->len);
647 if (resv->iov_len > PAGE_SIZE)
648 return -1;
649 memcpy(p, o->data, o->len);
650 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
651 return 0;
652}
653
654
655
656
657
658
659static int
660gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
661 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
662{
663 struct gss_ctx *ctx_id = rsci->mechctx;
664 struct xdr_buf rpchdr;
665 struct xdr_netobj checksum;
666 u32 flavor = 0;
667 struct kvec *argv = &rqstp->rq_arg.head[0];
668 struct kvec iov;
669
670
671 iov.iov_base = rpcstart;
672 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
673 xdr_buf_from_iov(&iov, &rpchdr);
674
675 *authp = rpc_autherr_badverf;
676 if (argv->iov_len < 4)
677 return SVC_DENIED;
678 flavor = svc_getnl(argv);
679 if (flavor != RPC_AUTH_GSS)
680 return SVC_DENIED;
681 if (svc_safe_getnetobj(argv, &checksum))
682 return SVC_DENIED;
683
684 if (rqstp->rq_deferred)
685 return SVC_OK;
686 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
687 *authp = rpcsec_gsserr_credproblem;
688 return SVC_DENIED;
689 }
690
691 if (gc->gc_seq > MAXSEQ) {
692 dprintk("RPC: svcauth_gss: discarding request with "
693 "large sequence number %d\n", gc->gc_seq);
694 *authp = rpcsec_gsserr_ctxproblem;
695 return SVC_DENIED;
696 }
697 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
698 dprintk("RPC: svcauth_gss: discarding request with "
699 "old sequence number %d\n", gc->gc_seq);
700 return SVC_DROP;
701 }
702 return SVC_OK;
703}
704
705static int
706gss_write_null_verf(struct svc_rqst *rqstp)
707{
708 __be32 *p;
709
710 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
711 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
712
713 *p++ = 0;
714 if (!xdr_ressize_check(rqstp, p))
715 return -1;
716 return 0;
717}
718
719static int
720gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
721{
722 __be32 *xdr_seq;
723 u32 maj_stat;
724 struct xdr_buf verf_data;
725 struct xdr_netobj mic;
726 __be32 *p;
727 struct kvec iov;
728 int err = -1;
729
730 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
731 xdr_seq = kmalloc(4, GFP_KERNEL);
732 if (!xdr_seq)
733 return -1;
734 *xdr_seq = htonl(seq);
735
736 iov.iov_base = xdr_seq;
737 iov.iov_len = 4;
738 xdr_buf_from_iov(&iov, &verf_data);
739 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
740 mic.data = (u8 *)(p + 1);
741 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
742 if (maj_stat != GSS_S_COMPLETE)
743 goto out;
744 *p++ = htonl(mic.len);
745 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
746 p += XDR_QUADLEN(mic.len);
747 if (!xdr_ressize_check(rqstp, p))
748 goto out;
749 err = 0;
750out:
751 kfree(xdr_seq);
752 return err;
753}
754
755struct gss_domain {
756 struct auth_domain h;
757 u32 pseudoflavor;
758};
759
760static struct auth_domain *
761find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
762{
763 char *name;
764
765 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
766 if (!name)
767 return NULL;
768 return auth_domain_find(name);
769}
770
771static struct auth_ops svcauthops_gss;
772
773u32 svcauth_gss_flavor(struct auth_domain *dom)
774{
775 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
776
777 return gd->pseudoflavor;
778}
779
780EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
781
782int
783svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
784{
785 struct gss_domain *new;
786 struct auth_domain *test;
787 int stat = -ENOMEM;
788
789 new = kmalloc(sizeof(*new), GFP_KERNEL);
790 if (!new)
791 goto out;
792 kref_init(&new->h.ref);
793 new->h.name = kstrdup(name, GFP_KERNEL);
794 if (!new->h.name)
795 goto out_free_dom;
796 new->h.flavour = &svcauthops_gss;
797 new->pseudoflavor = pseudoflavor;
798
799 stat = 0;
800 test = auth_domain_lookup(name, &new->h);
801 if (test != &new->h) {
802 auth_domain_put(test);
803 kfree(new->h.name);
804 goto out_free_dom;
805 }
806 return 0;
807
808out_free_dom:
809 kfree(new);
810out:
811 return stat;
812}
813
814EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
815
816static inline int
817read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
818{
819 __be32 raw;
820 int status;
821
822 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
823 if (status)
824 return status;
825 *obj = ntohl(raw);
826 return 0;
827}
828
829
830
831
832
833
834static int
835unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
836{
837 int stat = -EINVAL;
838 u32 integ_len, maj_stat;
839 struct xdr_netobj mic;
840 struct xdr_buf integ_buf;
841
842
843
844
845
846
847
848 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
849
850
851 if (rqstp->rq_deferred)
852 return 0;
853
854 integ_len = svc_getnl(&buf->head[0]);
855 if (integ_len & 3)
856 return stat;
857 if (integ_len > buf->len)
858 return stat;
859 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) {
860 WARN_ON_ONCE(1);
861 return stat;
862 }
863
864 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
865 return stat;
866 if (mic.len > RPC_MAX_AUTH_SIZE)
867 return stat;
868 mic.data = kmalloc(mic.len, GFP_KERNEL);
869 if (!mic.data)
870 return stat;
871 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
872 goto out;
873 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
874 if (maj_stat != GSS_S_COMPLETE)
875 goto out;
876 if (svc_getnl(&buf->head[0]) != seq)
877 goto out;
878
879 xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
880 stat = 0;
881out:
882 kfree(mic.data);
883 return stat;
884}
885
886static inline int
887total_buf_len(struct xdr_buf *buf)
888{
889 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
890}
891
892static void
893fix_priv_head(struct xdr_buf *buf, int pad)
894{
895 if (buf->page_len == 0) {
896
897
898
899 buf->head[0].iov_len -= pad;
900 }
901}
902
903static int
904unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
905{
906 u32 priv_len, maj_stat;
907 int pad, saved_len, remaining_len, offset;
908
909 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
910
911 priv_len = svc_getnl(&buf->head[0]);
912 if (rqstp->rq_deferred) {
913
914
915 goto out_seq;
916 }
917
918
919
920 remaining_len = total_buf_len(buf);
921 if (priv_len > remaining_len)
922 return -EINVAL;
923 pad = remaining_len - priv_len;
924 buf->len -= pad;
925 fix_priv_head(buf, pad);
926
927
928 saved_len = buf->len;
929 buf->len = priv_len;
930 maj_stat = gss_unwrap(ctx, 0, buf);
931 pad = priv_len - buf->len;
932 buf->len = saved_len;
933 buf->len -= pad;
934
935
936
937
938
939
940 offset = buf->head[0].iov_len % 4;
941 if (offset) {
942 buf->buflen = RPCSVC_MAXPAYLOAD;
943 xdr_shift_buf(buf, offset);
944 fix_priv_head(buf, pad);
945 }
946 if (maj_stat != GSS_S_COMPLETE)
947 return -EINVAL;
948out_seq:
949 if (svc_getnl(&buf->head[0]) != seq)
950 return -EINVAL;
951 return 0;
952}
953
954struct gss_svc_data {
955
956 struct rpc_gss_wire_cred clcred;
957
958
959 __be32 *verf_start;
960 struct rsc *rsci;
961};
962
963static int
964svcauth_gss_set_client(struct svc_rqst *rqstp)
965{
966 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
967 struct rsc *rsci = svcdata->rsci;
968 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
969 int stat;
970
971
972
973
974
975
976
977
978
979
980 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
981 if (rqstp->rq_gssclient == NULL)
982 return SVC_DENIED;
983 stat = svcauth_unix_set_client(rqstp);
984 if (stat == SVC_DROP || stat == SVC_CLOSE)
985 return stat;
986 return SVC_OK;
987}
988
989static inline int
990gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
991 struct xdr_netobj *out_handle, int *major_status)
992{
993 struct rsc *rsci;
994 int rc;
995
996 if (*major_status != GSS_S_COMPLETE)
997 return gss_write_null_verf(rqstp);
998 rsci = gss_svc_searchbyctx(cd, out_handle);
999 if (rsci == NULL) {
1000 *major_status = GSS_S_NO_CONTEXT;
1001 return gss_write_null_verf(rqstp);
1002 }
1003 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1004 cache_put(&rsci->h, cd);
1005 return rc;
1006}
1007
1008static inline int
1009gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1010 struct kvec *argv, __be32 *authp,
1011 struct xdr_netobj *in_handle)
1012{
1013
1014 *authp = rpc_autherr_badverf;
1015 if (argv->iov_len < 2 * 4)
1016 return SVC_DENIED;
1017 if (svc_getnl(argv) != RPC_AUTH_NULL)
1018 return SVC_DENIED;
1019 if (svc_getnl(argv) != 0)
1020 return SVC_DENIED;
1021
1022 *authp = rpc_autherr_badcred;
1023 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1024 return SVC_DENIED;
1025 if (dup_netobj(in_handle, &gc->gc_ctx))
1026 return SVC_CLOSE;
1027 *authp = rpc_autherr_badverf;
1028
1029 return 0;
1030}
1031
1032static inline int
1033gss_read_verf(struct rpc_gss_wire_cred *gc,
1034 struct kvec *argv, __be32 *authp,
1035 struct xdr_netobj *in_handle,
1036 struct xdr_netobj *in_token)
1037{
1038 struct xdr_netobj tmpobj;
1039 int res;
1040
1041 res = gss_read_common_verf(gc, argv, authp, in_handle);
1042 if (res)
1043 return res;
1044
1045 if (svc_safe_getnetobj(argv, &tmpobj)) {
1046 kfree(in_handle->data);
1047 return SVC_DENIED;
1048 }
1049 if (dup_netobj(in_token, &tmpobj)) {
1050 kfree(in_handle->data);
1051 return SVC_CLOSE;
1052 }
1053
1054 return 0;
1055}
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066static inline int
1067gss_read_proxy_verf(struct svc_rqst *rqstp,
1068 struct rpc_gss_wire_cred *gc, __be32 *authp,
1069 struct xdr_netobj *in_handle,
1070 struct gssp_in_token *in_token)
1071{
1072 struct kvec *argv = &rqstp->rq_arg.head[0];
1073 u32 inlen;
1074 int res;
1075
1076 res = gss_read_common_verf(gc, argv, authp, in_handle);
1077 if (res)
1078 return res;
1079
1080 inlen = svc_getnl(argv);
1081 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1082 return SVC_DENIED;
1083
1084 in_token->pages = rqstp->rq_pages;
1085 in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK;
1086 in_token->page_len = inlen;
1087
1088 return 0;
1089}
1090
1091static inline int
1092gss_write_resv(struct kvec *resv, size_t size_limit,
1093 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1094 int major_status, int minor_status)
1095{
1096 if (resv->iov_len + 4 > size_limit)
1097 return -1;
1098 svc_putnl(resv, RPC_SUCCESS);
1099 if (svc_safe_putnetobj(resv, out_handle))
1100 return -1;
1101 if (resv->iov_len + 3 * 4 > size_limit)
1102 return -1;
1103 svc_putnl(resv, major_status);
1104 svc_putnl(resv, minor_status);
1105 svc_putnl(resv, GSS_SEQ_WIN);
1106 if (svc_safe_putnetobj(resv, out_token))
1107 return -1;
1108 return 0;
1109}
1110
1111
1112
1113
1114
1115
1116
1117
1118static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1119 struct rpc_gss_wire_cred *gc, __be32 *authp)
1120{
1121 struct kvec *argv = &rqstp->rq_arg.head[0];
1122 struct kvec *resv = &rqstp->rq_res.head[0];
1123 struct rsi *rsip, rsikey;
1124 int ret;
1125 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1126
1127 memset(&rsikey, 0, sizeof(rsikey));
1128 ret = gss_read_verf(gc, argv, authp,
1129 &rsikey.in_handle, &rsikey.in_token);
1130 if (ret)
1131 return ret;
1132
1133
1134 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1135 rsi_free(&rsikey);
1136 if (!rsip)
1137 return SVC_CLOSE;
1138 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1139
1140 return SVC_CLOSE;
1141
1142 ret = SVC_CLOSE;
1143
1144 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1145 &rsip->out_handle, &rsip->major_status))
1146 goto out;
1147 if (gss_write_resv(resv, PAGE_SIZE,
1148 &rsip->out_handle, &rsip->out_token,
1149 rsip->major_status, rsip->minor_status))
1150 goto out;
1151
1152 ret = SVC_COMPLETE;
1153out:
1154 cache_put(&rsip->h, sn->rsi_cache);
1155 return ret;
1156}
1157
1158static int gss_proxy_save_rsc(struct cache_detail *cd,
1159 struct gssp_upcall_data *ud,
1160 uint64_t *handle)
1161{
1162 struct rsc rsci, *rscp = NULL;
1163 static atomic64_t ctxhctr;
1164 long long ctxh;
1165 struct gss_api_mech *gm = NULL;
1166 time_t expiry;
1167 int status = -EINVAL;
1168
1169 memset(&rsci, 0, sizeof(rsci));
1170
1171 status = -ENOMEM;
1172
1173
1174 ctxh = atomic64_inc_return(&ctxhctr);
1175
1176
1177 *handle = ctxh;
1178
1179
1180 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1181 goto out;
1182 rscp = rsc_lookup(cd, &rsci);
1183 if (!rscp)
1184 goto out;
1185
1186
1187 if (!ud->found_creds) {
1188
1189
1190 dprintk("RPC: No creds found!\n");
1191 goto out;
1192 } else {
1193
1194
1195 rsci.cred = ud->creds;
1196 memset(&ud->creds, 0, sizeof(struct svc_cred));
1197
1198 status = -EOPNOTSUPP;
1199
1200 gm = gss_mech_get_by_OID(&ud->mech_oid);
1201 if (!gm)
1202 goto out;
1203 rsci.cred.cr_gss_mech = gm;
1204
1205 status = -EINVAL;
1206
1207 status = gss_import_sec_context(ud->out_handle.data,
1208 ud->out_handle.len,
1209 gm, &rsci.mechctx,
1210 &expiry, GFP_KERNEL);
1211 if (status)
1212 goto out;
1213 }
1214
1215 rsci.h.expiry_time = expiry;
1216 rscp = rsc_update(cd, &rsci, rscp);
1217 status = 0;
1218out:
1219 rsc_free(&rsci);
1220 if (rscp)
1221 cache_put(&rscp->h, cd);
1222 else
1223 status = -ENOMEM;
1224 return status;
1225}
1226
1227static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1228 struct rpc_gss_wire_cred *gc, __be32 *authp)
1229{
1230 struct kvec *resv = &rqstp->rq_res.head[0];
1231 struct xdr_netobj cli_handle;
1232 struct gssp_upcall_data ud;
1233 uint64_t handle;
1234 int status;
1235 int ret;
1236 struct net *net = rqstp->rq_xprt->xpt_net;
1237 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1238
1239 memset(&ud, 0, sizeof(ud));
1240 ret = gss_read_proxy_verf(rqstp, gc, authp,
1241 &ud.in_handle, &ud.in_token);
1242 if (ret)
1243 return ret;
1244
1245 ret = SVC_CLOSE;
1246
1247
1248 status = gssp_accept_sec_context_upcall(net, &ud);
1249 if (status)
1250 goto out;
1251
1252 dprintk("RPC: svcauth_gss: gss major status = %d "
1253 "minor status = %d\n",
1254 ud.major_status, ud.minor_status);
1255
1256 switch (ud.major_status) {
1257 case GSS_S_CONTINUE_NEEDED:
1258 cli_handle = ud.out_handle;
1259 break;
1260 case GSS_S_COMPLETE:
1261 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1262 if (status)
1263 goto out;
1264 cli_handle.data = (u8 *)&handle;
1265 cli_handle.len = sizeof(handle);
1266 break;
1267 default:
1268 ret = SVC_CLOSE;
1269 goto out;
1270 }
1271
1272
1273 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1274 &cli_handle, &ud.major_status))
1275 goto out;
1276 if (gss_write_resv(resv, PAGE_SIZE,
1277 &cli_handle, &ud.out_token,
1278 ud.major_status, ud.minor_status))
1279 goto out;
1280
1281 ret = SVC_COMPLETE;
1282out:
1283 gssp_free_upcall_data(&ud);
1284 return ret;
1285}
1286
1287
1288
1289
1290
1291
1292static int set_gss_proxy(struct net *net, int type)
1293{
1294 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1295 int ret;
1296
1297 WARN_ON_ONCE(type != 0 && type != 1);
1298 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1299 if (ret != -1 && ret != type)
1300 return -EBUSY;
1301 return 0;
1302}
1303
1304static bool use_gss_proxy(struct net *net)
1305{
1306 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1307
1308
1309 if (sn->use_gss_proxy == -1)
1310 set_gss_proxy(net, 0);
1311 return sn->use_gss_proxy;
1312}
1313
1314#ifdef CONFIG_PROC_FS
1315
1316static ssize_t write_gssp(struct file *file, const char __user *buf,
1317 size_t count, loff_t *ppos)
1318{
1319 struct net *net = PDE_DATA(file_inode(file));
1320 char tbuf[20];
1321 unsigned long i;
1322 int res;
1323
1324 if (*ppos || count > sizeof(tbuf)-1)
1325 return -EINVAL;
1326 if (copy_from_user(tbuf, buf, count))
1327 return -EFAULT;
1328
1329 tbuf[count] = 0;
1330 res = kstrtoul(tbuf, 0, &i);
1331 if (res)
1332 return res;
1333 if (i != 1)
1334 return -EINVAL;
1335 res = set_gssp_clnt(net);
1336 if (res)
1337 return res;
1338 res = set_gss_proxy(net, 1);
1339 if (res)
1340 return res;
1341 return count;
1342}
1343
1344static ssize_t read_gssp(struct file *file, char __user *buf,
1345 size_t count, loff_t *ppos)
1346{
1347 struct net *net = PDE_DATA(file_inode(file));
1348 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1349 unsigned long p = *ppos;
1350 char tbuf[10];
1351 size_t len;
1352
1353 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1354 len = strlen(tbuf);
1355 if (p >= len)
1356 return 0;
1357 len -= p;
1358 if (len > count)
1359 len = count;
1360 if (copy_to_user(buf, (void *)(tbuf+p), len))
1361 return -EFAULT;
1362 *ppos += len;
1363 return len;
1364}
1365
1366static const struct file_operations use_gss_proxy_ops = {
1367 .open = nonseekable_open,
1368 .write = write_gssp,
1369 .read = read_gssp,
1370};
1371
1372static int create_use_gss_proxy_proc_entry(struct net *net)
1373{
1374 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1375 struct proc_dir_entry **p = &sn->use_gssp_proc;
1376
1377 sn->use_gss_proxy = -1;
1378 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1379 sn->proc_net_rpc,
1380 &use_gss_proxy_ops, net);
1381 if (!*p)
1382 return -ENOMEM;
1383 init_gssp_clnt(sn);
1384 return 0;
1385}
1386
1387static void destroy_use_gss_proxy_proc_entry(struct net *net)
1388{
1389 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1390
1391 if (sn->use_gssp_proc) {
1392 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1393 clear_gssp_clnt(sn);
1394 }
1395}
1396#else
1397
1398static int create_use_gss_proxy_proc_entry(struct net *net)
1399{
1400 return 0;
1401}
1402
1403static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1404
1405#endif
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415static int
1416svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1417{
1418 struct kvec *argv = &rqstp->rq_arg.head[0];
1419 struct kvec *resv = &rqstp->rq_res.head[0];
1420 u32 crlen;
1421 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1422 struct rpc_gss_wire_cred *gc;
1423 struct rsc *rsci = NULL;
1424 __be32 *rpcstart;
1425 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1426 int ret;
1427 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1428
1429 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",
1430 argv->iov_len);
1431
1432 *authp = rpc_autherr_badcred;
1433 if (!svcdata)
1434 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1435 if (!svcdata)
1436 goto auth_err;
1437 rqstp->rq_auth_data = svcdata;
1438 svcdata->verf_start = NULL;
1439 svcdata->rsci = NULL;
1440 gc = &svcdata->clcred;
1441
1442
1443
1444
1445 rpcstart = argv->iov_base;
1446 rpcstart -= 7;
1447
1448
1449
1450
1451
1452
1453 if (argv->iov_len < 5 * 4)
1454 goto auth_err;
1455 crlen = svc_getnl(argv);
1456 if (svc_getnl(argv) != RPC_GSS_VERSION)
1457 goto auth_err;
1458 gc->gc_proc = svc_getnl(argv);
1459 gc->gc_seq = svc_getnl(argv);
1460 gc->gc_svc = svc_getnl(argv);
1461 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1462 goto auth_err;
1463 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1464 goto auth_err;
1465
1466 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1467 goto auth_err;
1468
1469 *authp = rpc_autherr_badverf;
1470 switch (gc->gc_proc) {
1471 case RPC_GSS_PROC_INIT:
1472 case RPC_GSS_PROC_CONTINUE_INIT:
1473 if (use_gss_proxy(SVC_NET(rqstp)))
1474 return svcauth_gss_proxy_init(rqstp, gc, authp);
1475 else
1476 return svcauth_gss_legacy_init(rqstp, gc, authp);
1477 case RPC_GSS_PROC_DATA:
1478 case RPC_GSS_PROC_DESTROY:
1479
1480 *authp = rpcsec_gsserr_credproblem;
1481 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1482 if (!rsci)
1483 goto auth_err;
1484 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1485 case SVC_OK:
1486 break;
1487 case SVC_DENIED:
1488 goto auth_err;
1489 case SVC_DROP:
1490 goto drop;
1491 }
1492 break;
1493 default:
1494 *authp = rpc_autherr_rejectedcred;
1495 goto auth_err;
1496 }
1497
1498
1499 switch (gc->gc_proc) {
1500 case RPC_GSS_PROC_DESTROY:
1501 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1502 goto auth_err;
1503
1504 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1505 if (resv->iov_len + 4 > PAGE_SIZE)
1506 goto drop;
1507 svc_putnl(resv, RPC_SUCCESS);
1508 goto complete;
1509 case RPC_GSS_PROC_DATA:
1510 *authp = rpcsec_gsserr_ctxproblem;
1511 svcdata->verf_start = resv->iov_base + resv->iov_len;
1512 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1513 goto auth_err;
1514 rqstp->rq_cred = rsci->cred;
1515 get_group_info(rsci->cred.cr_group_info);
1516 *authp = rpc_autherr_badcred;
1517 switch (gc->gc_svc) {
1518 case RPC_GSS_SVC_NONE:
1519 break;
1520 case RPC_GSS_SVC_INTEGRITY:
1521
1522 svc_putnl(resv, 0);
1523 svc_putnl(resv, 0);
1524 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1525 gc->gc_seq, rsci->mechctx))
1526 goto garbage_args;
1527 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1528 break;
1529 case RPC_GSS_SVC_PRIVACY:
1530
1531 svc_putnl(resv, 0);
1532 svc_putnl(resv, 0);
1533 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1534 gc->gc_seq, rsci->mechctx))
1535 goto garbage_args;
1536 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1537 break;
1538 default:
1539 goto auth_err;
1540 }
1541 svcdata->rsci = rsci;
1542 cache_get(&rsci->h);
1543 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1544 rsci->mechctx->mech_type,
1545 GSS_C_QOP_DEFAULT,
1546 gc->gc_svc);
1547 ret = SVC_OK;
1548 goto out;
1549 }
1550garbage_args:
1551 ret = SVC_GARBAGE;
1552 goto out;
1553auth_err:
1554
1555 xdr_ressize_check(rqstp, reject_stat);
1556 ret = SVC_DENIED;
1557 goto out;
1558complete:
1559 ret = SVC_COMPLETE;
1560 goto out;
1561drop:
1562 ret = SVC_CLOSE;
1563out:
1564 if (rsci)
1565 cache_put(&rsci->h, sn->rsc_cache);
1566 return ret;
1567}
1568
1569static __be32 *
1570svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1571{
1572 __be32 *p;
1573 u32 verf_len;
1574
1575 p = gsd->verf_start;
1576 gsd->verf_start = NULL;
1577
1578
1579 if (*(p-1) != rpc_success)
1580 return NULL;
1581
1582 p += 1;
1583 verf_len = ntohl(*p++);
1584 p += XDR_QUADLEN(verf_len);
1585
1586 memcpy(p, p + 2, 4);
1587
1588 if (*p != rpc_success) {
1589 resbuf->head[0].iov_len -= 2 * 4;
1590 return NULL;
1591 }
1592 p++;
1593 return p;
1594}
1595
1596static inline int
1597svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1598{
1599 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1600 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1601 struct xdr_buf *resbuf = &rqstp->rq_res;
1602 struct xdr_buf integ_buf;
1603 struct xdr_netobj mic;
1604 struct kvec *resv;
1605 __be32 *p;
1606 int integ_offset, integ_len;
1607 int stat = -EINVAL;
1608
1609 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1610 if (p == NULL)
1611 goto out;
1612 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1613 integ_len = resbuf->len - integ_offset;
1614 BUG_ON(integ_len % 4);
1615 *p++ = htonl(integ_len);
1616 *p++ = htonl(gc->gc_seq);
1617 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1618 WARN_ON_ONCE(1);
1619 goto out_err;
1620 }
1621 if (resbuf->tail[0].iov_base == NULL) {
1622 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1623 goto out_err;
1624 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1625 + resbuf->head[0].iov_len;
1626 resbuf->tail[0].iov_len = 0;
1627 }
1628 resv = &resbuf->tail[0];
1629 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1630 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1631 goto out_err;
1632 svc_putnl(resv, mic.len);
1633 memset(mic.data + mic.len, 0,
1634 round_up_to_quad(mic.len) - mic.len);
1635 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1636
1637 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1638 BUG_ON(resv->iov_len > PAGE_SIZE);
1639out:
1640 stat = 0;
1641out_err:
1642 return stat;
1643}
1644
1645static inline int
1646svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1647{
1648 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1649 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1650 struct xdr_buf *resbuf = &rqstp->rq_res;
1651 struct page **inpages = NULL;
1652 __be32 *p, *len;
1653 int offset;
1654 int pad;
1655
1656 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1657 if (p == NULL)
1658 return 0;
1659 len = p++;
1660 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1661 *p++ = htonl(gc->gc_seq);
1662 inpages = resbuf->pages;
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673 if (resbuf->tail[0].iov_base) {
1674 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
1675 + PAGE_SIZE);
1676 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
1677 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1678 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1679 return -ENOMEM;
1680 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1681 resbuf->tail[0].iov_base,
1682 resbuf->tail[0].iov_len);
1683 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1684 }
1685
1686
1687
1688
1689
1690
1691
1692 if (resbuf->tail[0].iov_base == NULL) {
1693 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1694 return -ENOMEM;
1695 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1696 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1697 resbuf->tail[0].iov_len = 0;
1698 }
1699 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1700 return -ENOMEM;
1701 *len = htonl(resbuf->len - offset);
1702 pad = 3 - ((resbuf->len - offset - 1)&3);
1703 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1704 memset(p, 0, pad);
1705 resbuf->tail[0].iov_len += pad;
1706 resbuf->len += pad;
1707 return 0;
1708}
1709
1710static int
1711svcauth_gss_release(struct svc_rqst *rqstp)
1712{
1713 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1714 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1715 struct xdr_buf *resbuf = &rqstp->rq_res;
1716 int stat = -EINVAL;
1717 struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1718
1719 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1720 goto out;
1721
1722 if (gsd->verf_start == NULL)
1723 goto out;
1724
1725
1726
1727 resbuf->len = total_buf_len(resbuf);
1728 switch (gc->gc_svc) {
1729 case RPC_GSS_SVC_NONE:
1730 break;
1731 case RPC_GSS_SVC_INTEGRITY:
1732 stat = svcauth_gss_wrap_resp_integ(rqstp);
1733 if (stat)
1734 goto out_err;
1735 break;
1736 case RPC_GSS_SVC_PRIVACY:
1737 stat = svcauth_gss_wrap_resp_priv(rqstp);
1738 if (stat)
1739 goto out_err;
1740 break;
1741
1742
1743
1744
1745 }
1746
1747out:
1748 stat = 0;
1749out_err:
1750 if (rqstp->rq_client)
1751 auth_domain_put(rqstp->rq_client);
1752 rqstp->rq_client = NULL;
1753 if (rqstp->rq_gssclient)
1754 auth_domain_put(rqstp->rq_gssclient);
1755 rqstp->rq_gssclient = NULL;
1756 if (rqstp->rq_cred.cr_group_info)
1757 put_group_info(rqstp->rq_cred.cr_group_info);
1758 rqstp->rq_cred.cr_group_info = NULL;
1759 if (gsd->rsci)
1760 cache_put(&gsd->rsci->h, sn->rsc_cache);
1761 gsd->rsci = NULL;
1762
1763 return stat;
1764}
1765
1766static void
1767svcauth_gss_domain_release(struct auth_domain *dom)
1768{
1769 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1770
1771 kfree(dom->name);
1772 kfree(gd);
1773}
1774
1775static struct auth_ops svcauthops_gss = {
1776 .name = "rpcsec_gss",
1777 .owner = THIS_MODULE,
1778 .flavour = RPC_AUTH_GSS,
1779 .accept = svcauth_gss_accept,
1780 .release = svcauth_gss_release,
1781 .domain_release = svcauth_gss_domain_release,
1782 .set_client = svcauth_gss_set_client,
1783};
1784
1785static int rsi_cache_create_net(struct net *net)
1786{
1787 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1788 struct cache_detail *cd;
1789 int err;
1790
1791 cd = cache_create_net(&rsi_cache_template, net);
1792 if (IS_ERR(cd))
1793 return PTR_ERR(cd);
1794 err = cache_register_net(cd, net);
1795 if (err) {
1796 cache_destroy_net(cd, net);
1797 return err;
1798 }
1799 sn->rsi_cache = cd;
1800 return 0;
1801}
1802
1803static void rsi_cache_destroy_net(struct net *net)
1804{
1805 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1806 struct cache_detail *cd = sn->rsi_cache;
1807
1808 sn->rsi_cache = NULL;
1809 cache_purge(cd);
1810 cache_unregister_net(cd, net);
1811 cache_destroy_net(cd, net);
1812}
1813
1814static int rsc_cache_create_net(struct net *net)
1815{
1816 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1817 struct cache_detail *cd;
1818 int err;
1819
1820 cd = cache_create_net(&rsc_cache_template, net);
1821 if (IS_ERR(cd))
1822 return PTR_ERR(cd);
1823 err = cache_register_net(cd, net);
1824 if (err) {
1825 cache_destroy_net(cd, net);
1826 return err;
1827 }
1828 sn->rsc_cache = cd;
1829 return 0;
1830}
1831
1832static void rsc_cache_destroy_net(struct net *net)
1833{
1834 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1835 struct cache_detail *cd = sn->rsc_cache;
1836
1837 sn->rsc_cache = NULL;
1838 cache_purge(cd);
1839 cache_unregister_net(cd, net);
1840 cache_destroy_net(cd, net);
1841}
1842
1843int
1844gss_svc_init_net(struct net *net)
1845{
1846 int rv;
1847
1848 rv = rsc_cache_create_net(net);
1849 if (rv)
1850 return rv;
1851 rv = rsi_cache_create_net(net);
1852 if (rv)
1853 goto out1;
1854 rv = create_use_gss_proxy_proc_entry(net);
1855 if (rv)
1856 goto out2;
1857 return 0;
1858out2:
1859 destroy_use_gss_proxy_proc_entry(net);
1860out1:
1861 rsc_cache_destroy_net(net);
1862 return rv;
1863}
1864
1865void
1866gss_svc_shutdown_net(struct net *net)
1867{
1868 destroy_use_gss_proxy_proc_entry(net);
1869 rsi_cache_destroy_net(net);
1870 rsc_cache_destroy_net(net);
1871}
1872
1873int
1874gss_svc_init(void)
1875{
1876 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1877}
1878
1879void
1880gss_svc_shutdown(void)
1881{
1882 svc_auth_unregister(RPC_AUTH_GSS);
1883}
1884