1 // SPDX-License-Identifier: GPL-2.0
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>
8 * RPCSEC_GSS server authentication.
9 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
12 * The RPCSEC_GSS involves three stages:
15 * 3/ context destruction
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
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.
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
37 * mechanism specific information, such as a key
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>
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>
53 #include <trace/events/rpcgss.h>
55 #include "gss_rpc_upcall.h"
58 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
61 * Key is context handle (\x if empty) and gss_token.
62 * Content is major_status minor_status (integers) context_handle, reply_token.
66 static int netobj_equal(struct xdr_netobj
*a
, struct xdr_netobj
*b
)
68 return a
->len
== b
->len
&& 0 == memcmp(a
->data
, b
->data
, a
->len
);
71 #define RSI_HASHBITS 6
72 #define RSI_HASHMAX (1<<RSI_HASHBITS)
76 struct xdr_netobj in_handle
, in_token
;
77 struct xdr_netobj out_handle
, out_token
;
78 int major_status
, minor_status
;
79 struct rcu_head rcu_head
;
82 static struct rsi
*rsi_update(struct cache_detail
*cd
, struct rsi
*new, struct rsi
*old
);
83 static struct rsi
*rsi_lookup(struct cache_detail
*cd
, struct rsi
*item
);
85 static void rsi_free(struct rsi
*rsii
)
87 kfree(rsii
->in_handle
.data
);
88 kfree(rsii
->in_token
.data
);
89 kfree(rsii
->out_handle
.data
);
90 kfree(rsii
->out_token
.data
);
93 static void rsi_free_rcu(struct rcu_head
*head
)
95 struct rsi
*rsii
= container_of(head
, struct rsi
, rcu_head
);
101 static void rsi_put(struct kref
*ref
)
103 struct rsi
*rsii
= container_of(ref
, struct rsi
, h
.ref
);
105 call_rcu(&rsii
->rcu_head
, rsi_free_rcu
);
108 static inline int rsi_hash(struct rsi
*item
)
110 return hash_mem(item
->in_handle
.data
, item
->in_handle
.len
, RSI_HASHBITS
)
111 ^ hash_mem(item
->in_token
.data
, item
->in_token
.len
, RSI_HASHBITS
);
114 static int rsi_match(struct cache_head
*a
, struct cache_head
*b
)
116 struct rsi
*item
= container_of(a
, struct rsi
, h
);
117 struct rsi
*tmp
= container_of(b
, struct rsi
, h
);
118 return netobj_equal(&item
->in_handle
, &tmp
->in_handle
) &&
119 netobj_equal(&item
->in_token
, &tmp
->in_token
);
122 static int dup_to_netobj(struct xdr_netobj
*dst
, char *src
, int len
)
125 dst
->data
= (len
? kmemdup(src
, len
, GFP_KERNEL
) : NULL
);
126 if (len
&& !dst
->data
)
131 static inline int dup_netobj(struct xdr_netobj
*dst
, struct xdr_netobj
*src
)
133 return dup_to_netobj(dst
, src
->data
, src
->len
);
136 static void rsi_init(struct cache_head
*cnew
, struct cache_head
*citem
)
138 struct rsi
*new = container_of(cnew
, struct rsi
, h
);
139 struct rsi
*item
= container_of(citem
, struct rsi
, h
);
141 new->out_handle
.data
= NULL
;
142 new->out_handle
.len
= 0;
143 new->out_token
.data
= NULL
;
144 new->out_token
.len
= 0;
145 new->in_handle
.len
= item
->in_handle
.len
;
146 item
->in_handle
.len
= 0;
147 new->in_token
.len
= item
->in_token
.len
;
148 item
->in_token
.len
= 0;
149 new->in_handle
.data
= item
->in_handle
.data
;
150 item
->in_handle
.data
= NULL
;
151 new->in_token
.data
= item
->in_token
.data
;
152 item
->in_token
.data
= NULL
;
155 static void update_rsi(struct cache_head
*cnew
, struct cache_head
*citem
)
157 struct rsi
*new = container_of(cnew
, struct rsi
, h
);
158 struct rsi
*item
= container_of(citem
, struct rsi
, h
);
160 BUG_ON(new->out_handle
.data
|| new->out_token
.data
);
161 new->out_handle
.len
= item
->out_handle
.len
;
162 item
->out_handle
.len
= 0;
163 new->out_token
.len
= item
->out_token
.len
;
164 item
->out_token
.len
= 0;
165 new->out_handle
.data
= item
->out_handle
.data
;
166 item
->out_handle
.data
= NULL
;
167 new->out_token
.data
= item
->out_token
.data
;
168 item
->out_token
.data
= NULL
;
170 new->major_status
= item
->major_status
;
171 new->minor_status
= item
->minor_status
;
174 static struct cache_head
*rsi_alloc(void)
176 struct rsi
*rsii
= kmalloc(sizeof(*rsii
), GFP_KERNEL
);
183 static int rsi_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
185 return sunrpc_cache_pipe_upcall_timeout(cd
, h
);
188 static void rsi_request(struct cache_detail
*cd
,
189 struct cache_head
*h
,
190 char **bpp
, int *blen
)
192 struct rsi
*rsii
= container_of(h
, struct rsi
, h
);
194 qword_addhex(bpp
, blen
, rsii
->in_handle
.data
, rsii
->in_handle
.len
);
195 qword_addhex(bpp
, blen
, rsii
->in_token
.data
, rsii
->in_token
.len
);
199 static int rsi_parse(struct cache_detail
*cd
,
200 char *mesg
, int mlen
)
202 /* context token expiry major minor context token */
206 struct rsi rsii
, *rsip
= NULL
;
208 int status
= -EINVAL
;
210 memset(&rsii
, 0, sizeof(rsii
));
212 len
= qword_get(&mesg
, buf
, mlen
);
216 if (dup_to_netobj(&rsii
.in_handle
, buf
, len
))
220 len
= qword_get(&mesg
, buf
, mlen
);
225 if (dup_to_netobj(&rsii
.in_token
, buf
, len
))
228 rsip
= rsi_lookup(cd
, &rsii
);
234 expiry
= get_expiry(&mesg
);
240 len
= qword_get(&mesg
, buf
, mlen
);
243 rsii
.major_status
= simple_strtoul(buf
, &ep
, 10);
246 len
= qword_get(&mesg
, buf
, mlen
);
249 rsii
.minor_status
= simple_strtoul(buf
, &ep
, 10);
254 len
= qword_get(&mesg
, buf
, mlen
);
258 if (dup_to_netobj(&rsii
.out_handle
, buf
, len
))
262 len
= qword_get(&mesg
, buf
, mlen
);
267 if (dup_to_netobj(&rsii
.out_token
, buf
, len
))
269 rsii
.h
.expiry_time
= expiry
;
270 rsip
= rsi_update(cd
, &rsii
, rsip
);
275 cache_put(&rsip
->h
, cd
);
281 static const struct cache_detail rsi_cache_template
= {
282 .owner
= THIS_MODULE
,
283 .hash_size
= RSI_HASHMAX
,
284 .name
= "auth.rpcsec.init",
285 .cache_put
= rsi_put
,
286 .cache_upcall
= rsi_upcall
,
287 .cache_request
= rsi_request
,
288 .cache_parse
= rsi_parse
,
291 .update
= update_rsi
,
295 static struct rsi
*rsi_lookup(struct cache_detail
*cd
, struct rsi
*item
)
297 struct cache_head
*ch
;
298 int hash
= rsi_hash(item
);
300 ch
= sunrpc_cache_lookup_rcu(cd
, &item
->h
, hash
);
302 return container_of(ch
, struct rsi
, h
);
307 static struct rsi
*rsi_update(struct cache_detail
*cd
, struct rsi
*new, struct rsi
*old
)
309 struct cache_head
*ch
;
310 int hash
= rsi_hash(new);
312 ch
= sunrpc_cache_update(cd
, &new->h
,
315 return container_of(ch
, struct rsi
, h
);
322 * The rpcsec_context cache is used to store a context that is
323 * used in data exchange.
324 * The key is a context handle. The content is:
325 * uid, gidlist, mechanism, service-set, mech-specific-data
328 #define RSC_HASHBITS 10
329 #define RSC_HASHMAX (1<<RSC_HASHBITS)
331 #define GSS_SEQ_WIN 128
333 struct gss_svc_seq_data
{
334 /* highest seq number seen so far: */
336 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
337 * sd_win is nonzero iff sequence number i has been seen already: */
338 unsigned long sd_win
[GSS_SEQ_WIN
/BITS_PER_LONG
];
344 struct xdr_netobj handle
;
345 struct svc_cred cred
;
346 struct gss_svc_seq_data seqdata
;
347 struct gss_ctx
*mechctx
;
348 struct rcu_head rcu_head
;
351 static struct rsc
*rsc_update(struct cache_detail
*cd
, struct rsc
*new, struct rsc
*old
);
352 static struct rsc
*rsc_lookup(struct cache_detail
*cd
, struct rsc
*item
);
354 static void rsc_free(struct rsc
*rsci
)
356 kfree(rsci
->handle
.data
);
358 gss_delete_sec_context(&rsci
->mechctx
);
359 free_svc_cred(&rsci
->cred
);
362 static void rsc_free_rcu(struct rcu_head
*head
)
364 struct rsc
*rsci
= container_of(head
, struct rsc
, rcu_head
);
366 kfree(rsci
->handle
.data
);
370 static void rsc_put(struct kref
*ref
)
372 struct rsc
*rsci
= container_of(ref
, struct rsc
, h
.ref
);
375 gss_delete_sec_context(&rsci
->mechctx
);
376 free_svc_cred(&rsci
->cred
);
377 call_rcu(&rsci
->rcu_head
, rsc_free_rcu
);
381 rsc_hash(struct rsc
*rsci
)
383 return hash_mem(rsci
->handle
.data
, rsci
->handle
.len
, RSC_HASHBITS
);
387 rsc_match(struct cache_head
*a
, struct cache_head
*b
)
389 struct rsc
*new = container_of(a
, struct rsc
, h
);
390 struct rsc
*tmp
= container_of(b
, struct rsc
, h
);
392 return netobj_equal(&new->handle
, &tmp
->handle
);
396 rsc_init(struct cache_head
*cnew
, struct cache_head
*ctmp
)
398 struct rsc
*new = container_of(cnew
, struct rsc
, h
);
399 struct rsc
*tmp
= container_of(ctmp
, struct rsc
, h
);
401 new->handle
.len
= tmp
->handle
.len
;
403 new->handle
.data
= tmp
->handle
.data
;
404 tmp
->handle
.data
= NULL
;
406 init_svc_cred(&new->cred
);
410 update_rsc(struct cache_head
*cnew
, struct cache_head
*ctmp
)
412 struct rsc
*new = container_of(cnew
, struct rsc
, h
);
413 struct rsc
*tmp
= container_of(ctmp
, struct rsc
, h
);
415 new->mechctx
= tmp
->mechctx
;
417 memset(&new->seqdata
, 0, sizeof(new->seqdata
));
418 spin_lock_init(&new->seqdata
.sd_lock
);
419 new->cred
= tmp
->cred
;
420 init_svc_cred(&tmp
->cred
);
423 static struct cache_head
*
426 struct rsc
*rsci
= kmalloc(sizeof(*rsci
), GFP_KERNEL
);
433 static int rsc_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
438 static int rsc_parse(struct cache_detail
*cd
,
439 char *mesg
, int mlen
)
441 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
445 struct rsc rsci
, *rscp
= NULL
;
447 int status
= -EINVAL
;
448 struct gss_api_mech
*gm
= NULL
;
450 memset(&rsci
, 0, sizeof(rsci
));
452 len
= qword_get(&mesg
, buf
, mlen
);
453 if (len
< 0) goto out
;
455 if (dup_to_netobj(&rsci
.handle
, buf
, len
))
460 expiry
= get_expiry(&mesg
);
465 rscp
= rsc_lookup(cd
, &rsci
);
469 /* uid, or NEGATIVE */
470 rv
= get_int(&mesg
, &id
);
474 set_bit(CACHE_NEGATIVE
, &rsci
.h
.flags
);
479 * NOTE: we skip uid_valid()/gid_valid() checks here:
480 * instead, * -1 id's are later mapped to the
481 * (export-specific) anonymous id by nfsd_setuser.
483 * (But supplementary gid's get no such special
484 * treatment so are checked for validity here.)
487 rsci
.cred
.cr_uid
= make_kuid(current_user_ns(), id
);
490 if (get_int(&mesg
, &id
))
492 rsci
.cred
.cr_gid
= make_kgid(current_user_ns(), id
);
494 /* number of additional gid's */
495 if (get_int(&mesg
, &N
))
497 if (N
< 0 || N
> NGROUPS_MAX
)
500 rsci
.cred
.cr_group_info
= groups_alloc(N
);
501 if (rsci
.cred
.cr_group_info
== NULL
)
506 for (i
=0; i
<N
; i
++) {
508 if (get_int(&mesg
, &id
))
510 kgid
= make_kgid(current_user_ns(), id
);
511 if (!gid_valid(kgid
))
513 rsci
.cred
.cr_group_info
->gid
[i
] = kgid
;
515 groups_sort(rsci
.cred
.cr_group_info
);
518 len
= qword_get(&mesg
, buf
, mlen
);
521 gm
= rsci
.cred
.cr_gss_mech
= gss_mech_get_by_name(buf
);
522 status
= -EOPNOTSUPP
;
527 /* mech-specific data: */
528 len
= qword_get(&mesg
, buf
, mlen
);
531 status
= gss_import_sec_context(buf
, len
, gm
, &rsci
.mechctx
,
536 /* get client name */
537 len
= qword_get(&mesg
, buf
, mlen
);
539 rsci
.cred
.cr_principal
= kstrdup(buf
, GFP_KERNEL
);
540 if (!rsci
.cred
.cr_principal
) {
547 rsci
.h
.expiry_time
= expiry
;
548 rscp
= rsc_update(cd
, &rsci
, rscp
);
553 cache_put(&rscp
->h
, cd
);
559 static const struct cache_detail rsc_cache_template
= {
560 .owner
= THIS_MODULE
,
561 .hash_size
= RSC_HASHMAX
,
562 .name
= "auth.rpcsec.context",
563 .cache_put
= rsc_put
,
564 .cache_upcall
= rsc_upcall
,
565 .cache_parse
= rsc_parse
,
568 .update
= update_rsc
,
572 static struct rsc
*rsc_lookup(struct cache_detail
*cd
, struct rsc
*item
)
574 struct cache_head
*ch
;
575 int hash
= rsc_hash(item
);
577 ch
= sunrpc_cache_lookup_rcu(cd
, &item
->h
, hash
);
579 return container_of(ch
, struct rsc
, h
);
584 static struct rsc
*rsc_update(struct cache_detail
*cd
, struct rsc
*new, struct rsc
*old
)
586 struct cache_head
*ch
;
587 int hash
= rsc_hash(new);
589 ch
= sunrpc_cache_update(cd
, &new->h
,
592 return container_of(ch
, struct rsc
, h
);
599 gss_svc_searchbyctx(struct cache_detail
*cd
, struct xdr_netobj
*handle
)
604 memset(&rsci
, 0, sizeof(rsci
));
605 if (dup_to_netobj(&rsci
.handle
, handle
->data
, handle
->len
))
607 found
= rsc_lookup(cd
, &rsci
);
611 if (cache_check(cd
, &found
->h
, NULL
))
616 /* Implements sequence number algorithm as specified in RFC 2203. */
618 gss_check_seq_num(struct rsc
*rsci
, int seq_num
)
620 struct gss_svc_seq_data
*sd
= &rsci
->seqdata
;
622 spin_lock(&sd
->sd_lock
);
623 if (seq_num
> sd
->sd_max
) {
624 if (seq_num
>= sd
->sd_max
+ GSS_SEQ_WIN
) {
625 memset(sd
->sd_win
,0,sizeof(sd
->sd_win
));
626 sd
->sd_max
= seq_num
;
627 } else while (sd
->sd_max
< seq_num
) {
629 __clear_bit(sd
->sd_max
% GSS_SEQ_WIN
, sd
->sd_win
);
631 __set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
);
633 } else if (seq_num
<= sd
->sd_max
- GSS_SEQ_WIN
) {
636 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
637 if (__test_and_set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
))
640 spin_unlock(&sd
->sd_lock
);
643 spin_unlock(&sd
->sd_lock
);
647 static inline u32
round_up_to_quad(u32 i
)
649 return (i
+ 3 ) & ~3;
653 svc_safe_getnetobj(struct kvec
*argv
, struct xdr_netobj
*o
)
657 if (argv
->iov_len
< 4)
659 o
->len
= svc_getnl(argv
);
660 l
= round_up_to_quad(o
->len
);
661 if (argv
->iov_len
< l
)
663 o
->data
= argv
->iov_base
;
670 svc_safe_putnetobj(struct kvec
*resv
, struct xdr_netobj
*o
)
674 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
676 svc_putnl(resv
, o
->len
);
677 p
= resv
->iov_base
+ resv
->iov_len
;
678 resv
->iov_len
+= round_up_to_quad(o
->len
);
679 if (resv
->iov_len
> PAGE_SIZE
)
681 memcpy(p
, o
->data
, o
->len
);
682 memset(p
+ o
->len
, 0, round_up_to_quad(o
->len
) - o
->len
);
687 * Verify the checksum on the header and return SVC_OK on success.
688 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
689 * or return SVC_DENIED and indicate error in authp.
692 gss_verify_header(struct svc_rqst
*rqstp
, struct rsc
*rsci
,
693 __be32
*rpcstart
, struct rpc_gss_wire_cred
*gc
, __be32
*authp
)
695 struct gss_ctx
*ctx_id
= rsci
->mechctx
;
696 struct xdr_buf rpchdr
;
697 struct xdr_netobj checksum
;
699 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
702 /* data to compute the checksum over: */
703 iov
.iov_base
= rpcstart
;
704 iov
.iov_len
= (u8
*)argv
->iov_base
- (u8
*)rpcstart
;
705 xdr_buf_from_iov(&iov
, &rpchdr
);
707 *authp
= rpc_autherr_badverf
;
708 if (argv
->iov_len
< 4)
710 flavor
= svc_getnl(argv
);
711 if (flavor
!= RPC_AUTH_GSS
)
713 if (svc_safe_getnetobj(argv
, &checksum
))
716 if (rqstp
->rq_deferred
) /* skip verification of revisited request */
718 if (gss_verify_mic(ctx_id
, &rpchdr
, &checksum
) != GSS_S_COMPLETE
) {
719 *authp
= rpcsec_gsserr_credproblem
;
723 if (gc
->gc_seq
> MAXSEQ
) {
724 trace_rpcgss_svc_large_seqno(rqstp
->rq_xid
, gc
->gc_seq
);
725 *authp
= rpcsec_gsserr_ctxproblem
;
728 if (!gss_check_seq_num(rsci
, gc
->gc_seq
)) {
729 trace_rpcgss_svc_old_seqno(rqstp
->rq_xid
, gc
->gc_seq
);
736 gss_write_null_verf(struct svc_rqst
*rqstp
)
740 svc_putnl(rqstp
->rq_res
.head
, RPC_AUTH_NULL
);
741 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
742 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
744 if (!xdr_ressize_check(rqstp
, p
))
750 gss_write_verf(struct svc_rqst
*rqstp
, struct gss_ctx
*ctx_id
, u32 seq
)
754 struct xdr_buf verf_data
;
755 struct xdr_netobj mic
;
760 svc_putnl(rqstp
->rq_res
.head
, RPC_AUTH_GSS
);
761 xdr_seq
= kmalloc(4, GFP_KERNEL
);
764 *xdr_seq
= htonl(seq
);
766 iov
.iov_base
= xdr_seq
;
768 xdr_buf_from_iov(&iov
, &verf_data
);
769 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
770 mic
.data
= (u8
*)(p
+ 1);
771 maj_stat
= gss_get_mic(ctx_id
, &verf_data
, &mic
);
772 if (maj_stat
!= GSS_S_COMPLETE
)
774 *p
++ = htonl(mic
.len
);
775 memset((u8
*)p
+ mic
.len
, 0, round_up_to_quad(mic
.len
) - mic
.len
);
776 p
+= XDR_QUADLEN(mic
.len
);
777 if (!xdr_ressize_check(rqstp
, p
))
786 struct auth_domain h
;
790 static struct auth_domain
*
791 find_gss_auth_domain(struct gss_ctx
*ctx
, u32 svc
)
795 name
= gss_service_to_auth_domain_name(ctx
->mech_type
, svc
);
798 return auth_domain_find(name
);
801 static struct auth_ops svcauthops_gss
;
803 u32
svcauth_gss_flavor(struct auth_domain
*dom
)
805 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
807 return gd
->pseudoflavor
;
810 EXPORT_SYMBOL_GPL(svcauth_gss_flavor
);
813 svcauth_gss_register_pseudoflavor(u32 pseudoflavor
, char * name
)
815 struct gss_domain
*new;
816 struct auth_domain
*test
;
819 new = kmalloc(sizeof(*new), GFP_KERNEL
);
822 kref_init(&new->h
.ref
);
823 new->h
.name
= kstrdup(name
, GFP_KERNEL
);
826 new->h
.flavour
= &svcauthops_gss
;
827 new->pseudoflavor
= pseudoflavor
;
830 test
= auth_domain_lookup(name
, &new->h
);
831 if (test
!= &new->h
) { /* Duplicate registration */
832 auth_domain_put(test
);
844 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor
);
847 read_u32_from_xdr_buf(struct xdr_buf
*buf
, int base
, u32
*obj
)
852 status
= read_bytes_from_xdr_buf(buf
, base
, &raw
, sizeof(*obj
));
859 /* It would be nice if this bit of code could be shared with the client.
861 * The client shouldn't malloc(), would have to pass in own memory.
862 * The server uses base of head iovec as read pointer, while the
863 * client uses separate pointer. */
865 unwrap_integ_data(struct svc_rqst
*rqstp
, struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
868 u32 integ_len
, maj_stat
;
869 struct xdr_netobj mic
;
870 struct xdr_buf integ_buf
;
872 /* NFS READ normally uses splice to send data in-place. However
873 * the data in cache can change after the reply's MIC is computed
874 * but before the RPC reply is sent. To prevent the client from
875 * rejecting the server-computed MIC in this somewhat rare case,
876 * do not use splice with the GSS integrity service.
878 clear_bit(RQ_SPLICE_OK
, &rqstp
->rq_flags
);
880 /* Did we already verify the signature on the original pass through? */
881 if (rqstp
->rq_deferred
)
884 integ_len
= svc_getnl(&buf
->head
[0]);
887 if (integ_len
> buf
->len
)
889 if (xdr_buf_subsegment(buf
, &integ_buf
, 0, integ_len
)) {
893 /* copy out mic... */
894 if (read_u32_from_xdr_buf(buf
, integ_len
, &mic
.len
))
896 if (mic
.len
> RPC_MAX_AUTH_SIZE
)
898 mic
.data
= kmalloc(mic
.len
, GFP_KERNEL
);
901 if (read_bytes_from_xdr_buf(buf
, integ_len
+ 4, mic
.data
, mic
.len
))
903 maj_stat
= gss_verify_mic(ctx
, &integ_buf
, &mic
);
904 if (maj_stat
!= GSS_S_COMPLETE
)
906 if (svc_getnl(&buf
->head
[0]) != seq
)
908 /* trim off the mic and padding at the end before returning */
909 xdr_buf_trim(buf
, round_up_to_quad(mic
.len
) + 4);
917 total_buf_len(struct xdr_buf
*buf
)
919 return buf
->head
[0].iov_len
+ buf
->page_len
+ buf
->tail
[0].iov_len
;
923 fix_priv_head(struct xdr_buf
*buf
, int pad
)
925 if (buf
->page_len
== 0) {
926 /* We need to adjust head and buf->len in tandem in this
927 * case to make svc_defer() work--it finds the original
928 * buffer start using buf->len - buf->head[0].iov_len. */
929 buf
->head
[0].iov_len
-= pad
;
934 unwrap_priv_data(struct svc_rqst
*rqstp
, struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
936 u32 priv_len
, maj_stat
;
937 int pad
, remaining_len
, offset
;
939 clear_bit(RQ_SPLICE_OK
, &rqstp
->rq_flags
);
941 priv_len
= svc_getnl(&buf
->head
[0]);
942 if (rqstp
->rq_deferred
) {
943 /* Already decrypted last time through! The sequence number
944 * check at out_seq is unnecessary but harmless: */
947 /* buf->len is the number of bytes from the original start of the
948 * request to the end, where head[0].iov_len is just the bytes
949 * not yet read from the head, so these two values are different: */
950 remaining_len
= total_buf_len(buf
);
951 if (priv_len
> remaining_len
)
953 pad
= remaining_len
- priv_len
;
955 fix_priv_head(buf
, pad
);
957 maj_stat
= gss_unwrap(ctx
, 0, priv_len
, buf
);
958 pad
= priv_len
- buf
->len
;
960 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
961 * In the krb5p case, at least, the data ends up offset, so we need to
963 /* XXX: This is very inefficient. It would be better to either do
964 * this while we encrypt, or maybe in the receive code, if we can peak
965 * ahead and work out the service and mechanism there. */
966 offset
= xdr_pad_size(buf
->head
[0].iov_len
);
968 buf
->buflen
= RPCSVC_MAXPAYLOAD
;
969 xdr_shift_buf(buf
, offset
);
970 fix_priv_head(buf
, pad
);
972 if (maj_stat
!= GSS_S_COMPLETE
)
975 if (svc_getnl(&buf
->head
[0]) != seq
)
980 struct gss_svc_data
{
981 /* decoded gss client cred: */
982 struct rpc_gss_wire_cred clcred
;
983 /* save a pointer to the beginning of the encoded verifier,
984 * for use in encryption/checksumming in svcauth_gss_release: */
990 svcauth_gss_set_client(struct svc_rqst
*rqstp
)
992 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
993 struct rsc
*rsci
= svcdata
->rsci
;
994 struct rpc_gss_wire_cred
*gc
= &svcdata
->clcred
;
998 * A gss export can be specified either by:
999 * export *(sec=krb5,rw)
1001 * export gss/krb5(rw)
1002 * The latter is deprecated; but for backwards compatibility reasons
1003 * the nfsd code will still fall back on trying it if the former
1004 * doesn't work; so we try to make both available to nfsd, below.
1006 rqstp
->rq_gssclient
= find_gss_auth_domain(rsci
->mechctx
, gc
->gc_svc
);
1007 if (rqstp
->rq_gssclient
== NULL
)
1009 stat
= svcauth_unix_set_client(rqstp
);
1010 if (stat
== SVC_DROP
|| stat
== SVC_CLOSE
)
1016 gss_write_init_verf(struct cache_detail
*cd
, struct svc_rqst
*rqstp
,
1017 struct xdr_netobj
*out_handle
, int *major_status
)
1022 if (*major_status
!= GSS_S_COMPLETE
)
1023 return gss_write_null_verf(rqstp
);
1024 rsci
= gss_svc_searchbyctx(cd
, out_handle
);
1026 *major_status
= GSS_S_NO_CONTEXT
;
1027 return gss_write_null_verf(rqstp
);
1029 rc
= gss_write_verf(rqstp
, rsci
->mechctx
, GSS_SEQ_WIN
);
1030 cache_put(&rsci
->h
, cd
);
1035 gss_read_common_verf(struct rpc_gss_wire_cred
*gc
,
1036 struct kvec
*argv
, __be32
*authp
,
1037 struct xdr_netobj
*in_handle
)
1039 /* Read the verifier; should be NULL: */
1040 *authp
= rpc_autherr_badverf
;
1041 if (argv
->iov_len
< 2 * 4)
1043 if (svc_getnl(argv
) != RPC_AUTH_NULL
)
1045 if (svc_getnl(argv
) != 0)
1047 /* Martial context handle and token for upcall: */
1048 *authp
= rpc_autherr_badcred
;
1049 if (gc
->gc_proc
== RPC_GSS_PROC_INIT
&& gc
->gc_ctx
.len
!= 0)
1051 if (dup_netobj(in_handle
, &gc
->gc_ctx
))
1053 *authp
= rpc_autherr_badverf
;
1059 gss_read_verf(struct rpc_gss_wire_cred
*gc
,
1060 struct kvec
*argv
, __be32
*authp
,
1061 struct xdr_netobj
*in_handle
,
1062 struct xdr_netobj
*in_token
)
1064 struct xdr_netobj tmpobj
;
1067 res
= gss_read_common_verf(gc
, argv
, authp
, in_handle
);
1071 if (svc_safe_getnetobj(argv
, &tmpobj
)) {
1072 kfree(in_handle
->data
);
1075 if (dup_netobj(in_token
, &tmpobj
)) {
1076 kfree(in_handle
->data
);
1083 static void gss_free_in_token_pages(struct gssp_in_token
*in_token
)
1089 inlen
= in_token
->page_len
;
1091 if (in_token
->pages
[i
])
1092 put_page(in_token
->pages
[i
]);
1093 inlen
-= inlen
> PAGE_SIZE
? PAGE_SIZE
: inlen
;
1096 kfree(in_token
->pages
);
1097 in_token
->pages
= NULL
;
1100 static int gss_read_proxy_verf(struct svc_rqst
*rqstp
,
1101 struct rpc_gss_wire_cred
*gc
, __be32
*authp
,
1102 struct xdr_netobj
*in_handle
,
1103 struct gssp_in_token
*in_token
)
1105 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1106 unsigned int page_base
, length
;
1110 res
= gss_read_common_verf(gc
, argv
, authp
, in_handle
);
1114 inlen
= svc_getnl(argv
);
1115 if (inlen
> (argv
->iov_len
+ rqstp
->rq_arg
.page_len
))
1118 pages
= DIV_ROUND_UP(inlen
, PAGE_SIZE
);
1119 in_token
->pages
= kcalloc(pages
, sizeof(struct page
*), GFP_KERNEL
);
1120 if (!in_token
->pages
)
1122 in_token
->page_base
= 0;
1123 in_token
->page_len
= inlen
;
1124 for (i
= 0; i
< pages
; i
++) {
1125 in_token
->pages
[i
] = alloc_page(GFP_KERNEL
);
1126 if (!in_token
->pages
[i
]) {
1127 gss_free_in_token_pages(in_token
);
1132 length
= min_t(unsigned int, inlen
, argv
->iov_len
);
1133 memcpy(page_address(in_token
->pages
[0]), argv
->iov_base
, length
);
1137 page_base
= rqstp
->rq_arg
.page_base
;
1139 length
= min_t(unsigned int, inlen
, PAGE_SIZE
);
1140 memcpy(page_address(in_token
->pages
[i
]),
1141 page_address(rqstp
->rq_arg
.pages
[i
]) + page_base
,
1152 gss_write_resv(struct kvec
*resv
, size_t size_limit
,
1153 struct xdr_netobj
*out_handle
, struct xdr_netobj
*out_token
,
1154 int major_status
, int minor_status
)
1156 if (resv
->iov_len
+ 4 > size_limit
)
1158 svc_putnl(resv
, RPC_SUCCESS
);
1159 if (svc_safe_putnetobj(resv
, out_handle
))
1161 if (resv
->iov_len
+ 3 * 4 > size_limit
)
1163 svc_putnl(resv
, major_status
);
1164 svc_putnl(resv
, minor_status
);
1165 svc_putnl(resv
, GSS_SEQ_WIN
);
1166 if (svc_safe_putnetobj(resv
, out_token
))
1172 * Having read the cred already and found we're in the context
1173 * initiation case, read the verifier and initiate (or check the results
1174 * of) upcalls to userspace for help with context initiation. If
1175 * the upcall results are available, write the verifier and result.
1176 * Otherwise, drop the request pending an answer to the upcall.
1178 static int svcauth_gss_legacy_init(struct svc_rqst
*rqstp
,
1179 struct rpc_gss_wire_cred
*gc
, __be32
*authp
)
1181 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1182 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1183 struct rsi
*rsip
, rsikey
;
1185 struct sunrpc_net
*sn
= net_generic(SVC_NET(rqstp
), sunrpc_net_id
);
1187 memset(&rsikey
, 0, sizeof(rsikey
));
1188 ret
= gss_read_verf(gc
, argv
, authp
,
1189 &rsikey
.in_handle
, &rsikey
.in_token
);
1193 /* Perform upcall, or find upcall result: */
1194 rsip
= rsi_lookup(sn
->rsi_cache
, &rsikey
);
1198 if (cache_check(sn
->rsi_cache
, &rsip
->h
, &rqstp
->rq_chandle
) < 0)
1199 /* No upcall result: */
1203 /* Got an answer to the upcall; use it: */
1204 if (gss_write_init_verf(sn
->rsc_cache
, rqstp
,
1205 &rsip
->out_handle
, &rsip
->major_status
))
1207 if (gss_write_resv(resv
, PAGE_SIZE
,
1208 &rsip
->out_handle
, &rsip
->out_token
,
1209 rsip
->major_status
, rsip
->minor_status
))
1214 cache_put(&rsip
->h
, sn
->rsi_cache
);
1218 static int gss_proxy_save_rsc(struct cache_detail
*cd
,
1219 struct gssp_upcall_data
*ud
,
1222 struct rsc rsci
, *rscp
= NULL
;
1223 static atomic64_t ctxhctr
;
1225 struct gss_api_mech
*gm
= NULL
;
1227 int status
= -EINVAL
;
1229 memset(&rsci
, 0, sizeof(rsci
));
1230 /* context handle */
1232 /* the handle needs to be just a unique id,
1233 * use a static counter */
1234 ctxh
= atomic64_inc_return(&ctxhctr
);
1236 /* make a copy for the caller */
1239 /* make a copy for the rsc cache */
1240 if (dup_to_netobj(&rsci
.handle
, (char *)handle
, sizeof(uint64_t)))
1242 rscp
= rsc_lookup(cd
, &rsci
);
1247 if (!ud
->found_creds
) {
1248 /* userspace seem buggy, we should always get at least a
1249 * mapping to nobody */
1252 struct timespec64 boot
;
1255 rsci
.cred
= ud
->creds
;
1256 memset(&ud
->creds
, 0, sizeof(struct svc_cred
));
1258 status
= -EOPNOTSUPP
;
1259 /* get mech handle from OID */
1260 gm
= gss_mech_get_by_OID(&ud
->mech_oid
);
1263 rsci
.cred
.cr_gss_mech
= gm
;
1266 /* mech-specific data: */
1267 status
= gss_import_sec_context(ud
->out_handle
.data
,
1270 &expiry
, GFP_KERNEL
);
1274 getboottime64(&boot
);
1275 expiry
-= boot
.tv_sec
;
1278 rsci
.h
.expiry_time
= expiry
;
1279 rscp
= rsc_update(cd
, &rsci
, rscp
);
1284 cache_put(&rscp
->h
, cd
);
1290 static int svcauth_gss_proxy_init(struct svc_rqst
*rqstp
,
1291 struct rpc_gss_wire_cred
*gc
, __be32
*authp
)
1293 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1294 struct xdr_netobj cli_handle
;
1295 struct gssp_upcall_data ud
;
1299 struct net
*net
= SVC_NET(rqstp
);
1300 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1302 memset(&ud
, 0, sizeof(ud
));
1303 ret
= gss_read_proxy_verf(rqstp
, gc
, authp
,
1304 &ud
.in_handle
, &ud
.in_token
);
1310 /* Perform synchronous upcall to gss-proxy */
1311 status
= gssp_accept_sec_context_upcall(net
, &ud
);
1315 trace_rpcgss_svc_accept_upcall(rqstp
->rq_xid
, ud
.major_status
,
1318 switch (ud
.major_status
) {
1319 case GSS_S_CONTINUE_NEEDED
:
1320 cli_handle
= ud
.out_handle
;
1322 case GSS_S_COMPLETE
:
1323 status
= gss_proxy_save_rsc(sn
->rsc_cache
, &ud
, &handle
);
1326 cli_handle
.data
= (u8
*)&handle
;
1327 cli_handle
.len
= sizeof(handle
);
1333 /* Got an answer to the upcall; use it: */
1334 if (gss_write_init_verf(sn
->rsc_cache
, rqstp
,
1335 &cli_handle
, &ud
.major_status
))
1337 if (gss_write_resv(resv
, PAGE_SIZE
,
1338 &cli_handle
, &ud
.out_token
,
1339 ud
.major_status
, ud
.minor_status
))
1344 gss_free_in_token_pages(&ud
.in_token
);
1345 gssp_free_upcall_data(&ud
);
1350 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1351 * it to be changed if it's currently undefined (-1). If it's any other value
1352 * then return -EBUSY unless the type wouldn't have changed anyway.
1354 static int set_gss_proxy(struct net
*net
, int type
)
1356 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1359 WARN_ON_ONCE(type
!= 0 && type
!= 1);
1360 ret
= cmpxchg(&sn
->use_gss_proxy
, -1, type
);
1361 if (ret
!= -1 && ret
!= type
)
1366 static bool use_gss_proxy(struct net
*net
)
1368 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1370 /* If use_gss_proxy is still undefined, then try to disable it */
1371 if (sn
->use_gss_proxy
== -1)
1372 set_gss_proxy(net
, 0);
1373 return sn
->use_gss_proxy
;
1376 #ifdef CONFIG_PROC_FS
1378 static ssize_t
write_gssp(struct file
*file
, const char __user
*buf
,
1379 size_t count
, loff_t
*ppos
)
1381 struct net
*net
= PDE_DATA(file_inode(file
));
1386 if (*ppos
|| count
> sizeof(tbuf
)-1)
1388 if (copy_from_user(tbuf
, buf
, count
))
1392 res
= kstrtoul(tbuf
, 0, &i
);
1397 res
= set_gssp_clnt(net
);
1400 res
= set_gss_proxy(net
, 1);
1406 static ssize_t
read_gssp(struct file
*file
, char __user
*buf
,
1407 size_t count
, loff_t
*ppos
)
1409 struct net
*net
= PDE_DATA(file_inode(file
));
1410 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1411 unsigned long p
= *ppos
;
1415 snprintf(tbuf
, sizeof(tbuf
), "%d\n", sn
->use_gss_proxy
);
1422 if (copy_to_user(buf
, (void *)(tbuf
+p
), len
))
1428 static const struct proc_ops use_gss_proxy_proc_ops
= {
1429 .proc_open
= nonseekable_open
,
1430 .proc_write
= write_gssp
,
1431 .proc_read
= read_gssp
,
1434 static int create_use_gss_proxy_proc_entry(struct net
*net
)
1436 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1437 struct proc_dir_entry
**p
= &sn
->use_gssp_proc
;
1439 sn
->use_gss_proxy
= -1;
1440 *p
= proc_create_data("use-gss-proxy", S_IFREG
| 0600,
1442 &use_gss_proxy_proc_ops
, net
);
1449 static void destroy_use_gss_proxy_proc_entry(struct net
*net
)
1451 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1453 if (sn
->use_gssp_proc
) {
1454 remove_proc_entry("use-gss-proxy", sn
->proc_net_rpc
);
1455 clear_gssp_clnt(sn
);
1458 #else /* CONFIG_PROC_FS */
1460 static int create_use_gss_proxy_proc_entry(struct net
*net
)
1465 static void destroy_use_gss_proxy_proc_entry(struct net
*net
) {}
1467 #endif /* CONFIG_PROC_FS */
1470 * Accept an rpcsec packet.
1471 * If context establishment, punt to user space
1472 * If data exchange, verify/decrypt
1473 * If context destruction, handle here
1474 * In the context establishment and destruction case we encode
1475 * response here and return SVC_COMPLETE.
1478 svcauth_gss_accept(struct svc_rqst
*rqstp
, __be32
*authp
)
1480 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1481 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1483 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
1484 struct rpc_gss_wire_cred
*gc
;
1485 struct rsc
*rsci
= NULL
;
1487 __be32
*reject_stat
= resv
->iov_base
+ resv
->iov_len
;
1489 struct sunrpc_net
*sn
= net_generic(SVC_NET(rqstp
), sunrpc_net_id
);
1491 trace_rpcgss_svc_accept(rqstp
->rq_xid
, argv
->iov_len
);
1493 *authp
= rpc_autherr_badcred
;
1495 svcdata
= kmalloc(sizeof(*svcdata
), GFP_KERNEL
);
1498 rqstp
->rq_auth_data
= svcdata
;
1499 svcdata
->verf_start
= NULL
;
1500 svcdata
->rsci
= NULL
;
1501 gc
= &svcdata
->clcred
;
1503 /* start of rpc packet is 7 u32's back from here:
1504 * xid direction rpcversion prog vers proc flavour
1506 rpcstart
= argv
->iov_base
;
1510 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1511 * at least 5 u32s, and is preceded by length, so that makes 6.
1514 if (argv
->iov_len
< 5 * 4)
1516 crlen
= svc_getnl(argv
);
1517 if (svc_getnl(argv
) != RPC_GSS_VERSION
)
1519 gc
->gc_proc
= svc_getnl(argv
);
1520 gc
->gc_seq
= svc_getnl(argv
);
1521 gc
->gc_svc
= svc_getnl(argv
);
1522 if (svc_safe_getnetobj(argv
, &gc
->gc_ctx
))
1524 if (crlen
!= round_up_to_quad(gc
->gc_ctx
.len
) + 5 * 4)
1527 if ((gc
->gc_proc
!= RPC_GSS_PROC_DATA
) && (rqstp
->rq_proc
!= 0))
1530 *authp
= rpc_autherr_badverf
;
1531 switch (gc
->gc_proc
) {
1532 case RPC_GSS_PROC_INIT
:
1533 case RPC_GSS_PROC_CONTINUE_INIT
:
1534 if (use_gss_proxy(SVC_NET(rqstp
)))
1535 return svcauth_gss_proxy_init(rqstp
, gc
, authp
);
1537 return svcauth_gss_legacy_init(rqstp
, gc
, authp
);
1538 case RPC_GSS_PROC_DATA
:
1539 case RPC_GSS_PROC_DESTROY
:
1540 /* Look up the context, and check the verifier: */
1541 *authp
= rpcsec_gsserr_credproblem
;
1542 rsci
= gss_svc_searchbyctx(sn
->rsc_cache
, &gc
->gc_ctx
);
1545 switch (gss_verify_header(rqstp
, rsci
, rpcstart
, gc
, authp
)) {
1555 *authp
= rpc_autherr_rejectedcred
;
1559 /* now act upon the command: */
1560 switch (gc
->gc_proc
) {
1561 case RPC_GSS_PROC_DESTROY
:
1562 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1564 /* Delete the entry from the cache_list and call cache_put */
1565 sunrpc_cache_unhash(sn
->rsc_cache
, &rsci
->h
);
1566 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1568 svc_putnl(resv
, RPC_SUCCESS
);
1570 case RPC_GSS_PROC_DATA
:
1571 *authp
= rpcsec_gsserr_ctxproblem
;
1572 svcdata
->verf_start
= resv
->iov_base
+ resv
->iov_len
;
1573 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1575 rqstp
->rq_cred
= rsci
->cred
;
1576 get_group_info(rsci
->cred
.cr_group_info
);
1577 *authp
= rpc_autherr_badcred
;
1578 switch (gc
->gc_svc
) {
1579 case RPC_GSS_SVC_NONE
:
1581 case RPC_GSS_SVC_INTEGRITY
:
1582 /* placeholders for length and seq. number: */
1585 if (unwrap_integ_data(rqstp
, &rqstp
->rq_arg
,
1586 gc
->gc_seq
, rsci
->mechctx
))
1588 rqstp
->rq_auth_slack
= RPC_MAX_AUTH_SIZE
;
1590 case RPC_GSS_SVC_PRIVACY
:
1591 /* placeholders for length and seq. number: */
1594 if (unwrap_priv_data(rqstp
, &rqstp
->rq_arg
,
1595 gc
->gc_seq
, rsci
->mechctx
))
1597 rqstp
->rq_auth_slack
= RPC_MAX_AUTH_SIZE
* 2;
1602 svcdata
->rsci
= rsci
;
1603 cache_get(&rsci
->h
);
1604 rqstp
->rq_cred
.cr_flavor
= gss_svc_to_pseudoflavor(
1605 rsci
->mechctx
->mech_type
,
1615 /* Restore write pointer to its original value: */
1616 xdr_ressize_check(rqstp
, reject_stat
);
1626 cache_put(&rsci
->h
, sn
->rsc_cache
);
1631 svcauth_gss_prepare_to_wrap(struct xdr_buf
*resbuf
, struct gss_svc_data
*gsd
)
1636 p
= gsd
->verf_start
;
1637 gsd
->verf_start
= NULL
;
1639 /* If the reply stat is nonzero, don't wrap: */
1640 if (*(p
-1) != rpc_success
)
1642 /* Skip the verifier: */
1644 verf_len
= ntohl(*p
++);
1645 p
+= XDR_QUADLEN(verf_len
);
1646 /* move accept_stat to right place: */
1647 memcpy(p
, p
+ 2, 4);
1648 /* Also don't wrap if the accept stat is nonzero: */
1649 if (*p
!= rpc_success
) {
1650 resbuf
->head
[0].iov_len
-= 2 * 4;
1658 svcauth_gss_wrap_resp_integ(struct svc_rqst
*rqstp
)
1660 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1661 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1662 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1663 struct xdr_buf integ_buf
;
1664 struct xdr_netobj mic
;
1667 int integ_offset
, integ_len
;
1670 p
= svcauth_gss_prepare_to_wrap(resbuf
, gsd
);
1673 integ_offset
= (u8
*)(p
+ 1) - (u8
*)resbuf
->head
[0].iov_base
;
1674 integ_len
= resbuf
->len
- integ_offset
;
1677 *p
++ = htonl(integ_len
);
1678 *p
++ = htonl(gc
->gc_seq
);
1679 if (xdr_buf_subsegment(resbuf
, &integ_buf
, integ_offset
, integ_len
)) {
1683 if (resbuf
->tail
[0].iov_base
== NULL
) {
1684 if (resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1686 resbuf
->tail
[0].iov_base
= resbuf
->head
[0].iov_base
1687 + resbuf
->head
[0].iov_len
;
1688 resbuf
->tail
[0].iov_len
= 0;
1690 resv
= &resbuf
->tail
[0];
1691 mic
.data
= (u8
*)resv
->iov_base
+ resv
->iov_len
+ 4;
1692 if (gss_get_mic(gsd
->rsci
->mechctx
, &integ_buf
, &mic
))
1694 svc_putnl(resv
, mic
.len
);
1695 memset(mic
.data
+ mic
.len
, 0,
1696 round_up_to_quad(mic
.len
) - mic
.len
);
1697 resv
->iov_len
+= XDR_QUADLEN(mic
.len
) << 2;
1698 /* not strictly required: */
1699 resbuf
->len
+= XDR_QUADLEN(mic
.len
) << 2;
1700 if (resv
->iov_len
> PAGE_SIZE
)
1709 svcauth_gss_wrap_resp_priv(struct svc_rqst
*rqstp
)
1711 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1712 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1713 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1714 struct page
**inpages
= NULL
;
1719 p
= svcauth_gss_prepare_to_wrap(resbuf
, gsd
);
1723 offset
= (u8
*)p
- (u8
*)resbuf
->head
[0].iov_base
;
1724 *p
++ = htonl(gc
->gc_seq
);
1725 inpages
= resbuf
->pages
;
1726 /* XXX: Would be better to write some xdr helper functions for
1727 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1730 * If there is currently tail data, make sure there is
1731 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1732 * the page, and move the current tail data such that
1733 * there is RPC_MAX_AUTH_SIZE slack space available in
1734 * both the head and tail.
1736 if (resbuf
->tail
[0].iov_base
) {
1737 if (resbuf
->tail
[0].iov_base
>=
1738 resbuf
->head
[0].iov_base
+ PAGE_SIZE
)
1740 if (resbuf
->tail
[0].iov_base
< resbuf
->head
[0].iov_base
)
1742 if (resbuf
->tail
[0].iov_len
+ resbuf
->head
[0].iov_len
1743 + 2 * RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1745 memmove(resbuf
->tail
[0].iov_base
+ RPC_MAX_AUTH_SIZE
,
1746 resbuf
->tail
[0].iov_base
,
1747 resbuf
->tail
[0].iov_len
);
1748 resbuf
->tail
[0].iov_base
+= RPC_MAX_AUTH_SIZE
;
1751 * If there is no current tail data, make sure there is
1752 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1753 * allotted page, and set up tail information such that there
1754 * is RPC_MAX_AUTH_SIZE slack space available in both the
1757 if (resbuf
->tail
[0].iov_base
== NULL
) {
1758 if (resbuf
->head
[0].iov_len
+ 2*RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1760 resbuf
->tail
[0].iov_base
= resbuf
->head
[0].iov_base
1761 + resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
;
1762 resbuf
->tail
[0].iov_len
= 0;
1764 if (gss_wrap(gsd
->rsci
->mechctx
, offset
, resbuf
, inpages
))
1766 *len
= htonl(resbuf
->len
- offset
);
1767 pad
= 3 - ((resbuf
->len
- offset
- 1)&3);
1768 p
= (__be32
*)(resbuf
->tail
[0].iov_base
+ resbuf
->tail
[0].iov_len
);
1770 resbuf
->tail
[0].iov_len
+= pad
;
1776 svcauth_gss_release(struct svc_rqst
*rqstp
)
1778 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1779 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1780 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1782 struct sunrpc_net
*sn
= net_generic(SVC_NET(rqstp
), sunrpc_net_id
);
1784 if (gc
->gc_proc
!= RPC_GSS_PROC_DATA
)
1786 /* Release can be called twice, but we only wrap once. */
1787 if (gsd
->verf_start
== NULL
)
1789 /* normally not set till svc_send, but we need it here: */
1790 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1792 resbuf
->len
= total_buf_len(resbuf
);
1793 switch (gc
->gc_svc
) {
1794 case RPC_GSS_SVC_NONE
:
1796 case RPC_GSS_SVC_INTEGRITY
:
1797 stat
= svcauth_gss_wrap_resp_integ(rqstp
);
1801 case RPC_GSS_SVC_PRIVACY
:
1802 stat
= svcauth_gss_wrap_resp_priv(rqstp
);
1807 * For any other gc_svc value, svcauth_gss_accept() already set
1808 * the auth_error appropriately; just fall through:
1815 if (rqstp
->rq_client
)
1816 auth_domain_put(rqstp
->rq_client
);
1817 rqstp
->rq_client
= NULL
;
1818 if (rqstp
->rq_gssclient
)
1819 auth_domain_put(rqstp
->rq_gssclient
);
1820 rqstp
->rq_gssclient
= NULL
;
1821 if (rqstp
->rq_cred
.cr_group_info
)
1822 put_group_info(rqstp
->rq_cred
.cr_group_info
);
1823 rqstp
->rq_cred
.cr_group_info
= NULL
;
1825 cache_put(&gsd
->rsci
->h
, sn
->rsc_cache
);
1832 svcauth_gss_domain_release_rcu(struct rcu_head
*head
)
1834 struct auth_domain
*dom
= container_of(head
, struct auth_domain
, rcu_head
);
1835 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
1842 svcauth_gss_domain_release(struct auth_domain
*dom
)
1844 call_rcu(&dom
->rcu_head
, svcauth_gss_domain_release_rcu
);
1847 static struct auth_ops svcauthops_gss
= {
1848 .name
= "rpcsec_gss",
1849 .owner
= THIS_MODULE
,
1850 .flavour
= RPC_AUTH_GSS
,
1851 .accept
= svcauth_gss_accept
,
1852 .release
= svcauth_gss_release
,
1853 .domain_release
= svcauth_gss_domain_release
,
1854 .set_client
= svcauth_gss_set_client
,
1857 static int rsi_cache_create_net(struct net
*net
)
1859 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1860 struct cache_detail
*cd
;
1863 cd
= cache_create_net(&rsi_cache_template
, net
);
1866 err
= cache_register_net(cd
, net
);
1868 cache_destroy_net(cd
, net
);
1875 static void rsi_cache_destroy_net(struct net
*net
)
1877 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1878 struct cache_detail
*cd
= sn
->rsi_cache
;
1880 sn
->rsi_cache
= NULL
;
1882 cache_unregister_net(cd
, net
);
1883 cache_destroy_net(cd
, net
);
1886 static int rsc_cache_create_net(struct net
*net
)
1888 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1889 struct cache_detail
*cd
;
1892 cd
= cache_create_net(&rsc_cache_template
, net
);
1895 err
= cache_register_net(cd
, net
);
1897 cache_destroy_net(cd
, net
);
1904 static void rsc_cache_destroy_net(struct net
*net
)
1906 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1907 struct cache_detail
*cd
= sn
->rsc_cache
;
1909 sn
->rsc_cache
= NULL
;
1911 cache_unregister_net(cd
, net
);
1912 cache_destroy_net(cd
, net
);
1916 gss_svc_init_net(struct net
*net
)
1920 rv
= rsc_cache_create_net(net
);
1923 rv
= rsi_cache_create_net(net
);
1926 rv
= create_use_gss_proxy_proc_entry(net
);
1931 destroy_use_gss_proxy_proc_entry(net
);
1933 rsc_cache_destroy_net(net
);
1938 gss_svc_shutdown_net(struct net
*net
)
1940 destroy_use_gss_proxy_proc_entry(net
);
1941 rsi_cache_destroy_net(net
);
1942 rsc_cache_destroy_net(net
);
1948 return svc_auth_register(RPC_AUTH_GSS
, &svcauthops_gss
);
1952 gss_svc_shutdown(void)
1954 svc_auth_unregister(RPC_AUTH_GSS
);