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
))
617 * gss_check_seq_num - GSS sequence number window check
618 * @rqstp: RPC Call to use when reporting errors
619 * @rsci: cached GSS context state (updated on return)
620 * @seq_num: sequence number to check
622 * Implements sequence number algorithm as specified in
623 * RFC 2203, Section 5.3.3.1. "Context Management".
626 * %true: @rqstp's GSS sequence number is inside the window
627 * %false: @rqstp's GSS sequence number is outside the window
629 static bool gss_check_seq_num(const struct svc_rqst
*rqstp
, struct rsc
*rsci
,
632 struct gss_svc_seq_data
*sd
= &rsci
->seqdata
;
635 spin_lock(&sd
->sd_lock
);
636 if (seq_num
> sd
->sd_max
) {
637 if (seq_num
>= sd
->sd_max
+ GSS_SEQ_WIN
) {
638 memset(sd
->sd_win
, 0, sizeof(sd
->sd_win
));
639 sd
->sd_max
= seq_num
;
640 } else while (sd
->sd_max
< seq_num
) {
642 __clear_bit(sd
->sd_max
% GSS_SEQ_WIN
, sd
->sd_win
);
644 __set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
);
646 } else if (seq_num
<= sd
->sd_max
- GSS_SEQ_WIN
) {
649 if (__test_and_set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
))
655 spin_unlock(&sd
->sd_lock
);
659 trace_rpcgss_svc_seqno_low(rqstp
, seq_num
,
660 sd
->sd_max
- GSS_SEQ_WIN
,
664 trace_rpcgss_svc_seqno_seen(rqstp
, seq_num
);
668 static inline u32
round_up_to_quad(u32 i
)
670 return (i
+ 3 ) & ~3;
674 svc_safe_getnetobj(struct kvec
*argv
, struct xdr_netobj
*o
)
678 if (argv
->iov_len
< 4)
680 o
->len
= svc_getnl(argv
);
681 l
= round_up_to_quad(o
->len
);
682 if (argv
->iov_len
< l
)
684 o
->data
= argv
->iov_base
;
691 svc_safe_putnetobj(struct kvec
*resv
, struct xdr_netobj
*o
)
695 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
697 svc_putnl(resv
, o
->len
);
698 p
= resv
->iov_base
+ resv
->iov_len
;
699 resv
->iov_len
+= round_up_to_quad(o
->len
);
700 if (resv
->iov_len
> PAGE_SIZE
)
702 memcpy(p
, o
->data
, o
->len
);
703 memset(p
+ o
->len
, 0, round_up_to_quad(o
->len
) - o
->len
);
708 * Verify the checksum on the header and return SVC_OK on success.
709 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
710 * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat.
713 gss_verify_header(struct svc_rqst
*rqstp
, struct rsc
*rsci
,
714 __be32
*rpcstart
, struct rpc_gss_wire_cred
*gc
)
716 struct gss_ctx
*ctx_id
= rsci
->mechctx
;
717 struct xdr_buf rpchdr
;
718 struct xdr_netobj checksum
;
720 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
723 /* data to compute the checksum over: */
724 iov
.iov_base
= rpcstart
;
725 iov
.iov_len
= (u8
*)argv
->iov_base
- (u8
*)rpcstart
;
726 xdr_buf_from_iov(&iov
, &rpchdr
);
728 rqstp
->rq_auth_stat
= rpc_autherr_badverf
;
729 if (argv
->iov_len
< 4)
731 flavor
= svc_getnl(argv
);
732 if (flavor
!= RPC_AUTH_GSS
)
734 if (svc_safe_getnetobj(argv
, &checksum
))
737 if (rqstp
->rq_deferred
) /* skip verification of revisited request */
739 if (gss_verify_mic(ctx_id
, &rpchdr
, &checksum
) != GSS_S_COMPLETE
) {
740 rqstp
->rq_auth_stat
= rpcsec_gsserr_credproblem
;
744 if (gc
->gc_seq
> MAXSEQ
) {
745 trace_rpcgss_svc_seqno_large(rqstp
, gc
->gc_seq
);
746 rqstp
->rq_auth_stat
= rpcsec_gsserr_ctxproblem
;
749 if (!gss_check_seq_num(rqstp
, rsci
, gc
->gc_seq
))
755 gss_write_null_verf(struct svc_rqst
*rqstp
)
759 svc_putnl(rqstp
->rq_res
.head
, RPC_AUTH_NULL
);
760 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
761 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
763 if (!xdr_ressize_check(rqstp
, p
))
769 gss_write_verf(struct svc_rqst
*rqstp
, struct gss_ctx
*ctx_id
, u32 seq
)
773 struct xdr_buf verf_data
;
774 struct xdr_netobj mic
;
779 svc_putnl(rqstp
->rq_res
.head
, RPC_AUTH_GSS
);
780 xdr_seq
= kmalloc(4, GFP_KERNEL
);
783 *xdr_seq
= htonl(seq
);
785 iov
.iov_base
= xdr_seq
;
787 xdr_buf_from_iov(&iov
, &verf_data
);
788 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
789 mic
.data
= (u8
*)(p
+ 1);
790 maj_stat
= gss_get_mic(ctx_id
, &verf_data
, &mic
);
791 if (maj_stat
!= GSS_S_COMPLETE
)
793 *p
++ = htonl(mic
.len
);
794 memset((u8
*)p
+ mic
.len
, 0, round_up_to_quad(mic
.len
) - mic
.len
);
795 p
+= XDR_QUADLEN(mic
.len
);
796 if (!xdr_ressize_check(rqstp
, p
))
805 struct auth_domain h
;
809 static struct auth_domain
*
810 find_gss_auth_domain(struct gss_ctx
*ctx
, u32 svc
)
814 name
= gss_service_to_auth_domain_name(ctx
->mech_type
, svc
);
817 return auth_domain_find(name
);
820 static struct auth_ops svcauthops_gss
;
822 u32
svcauth_gss_flavor(struct auth_domain
*dom
)
824 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
826 return gd
->pseudoflavor
;
829 EXPORT_SYMBOL_GPL(svcauth_gss_flavor
);
832 svcauth_gss_register_pseudoflavor(u32 pseudoflavor
, char * name
)
834 struct gss_domain
*new;
835 struct auth_domain
*test
;
838 new = kmalloc(sizeof(*new), GFP_KERNEL
);
841 kref_init(&new->h
.ref
);
842 new->h
.name
= kstrdup(name
, GFP_KERNEL
);
845 new->h
.flavour
= &svcauthops_gss
;
846 new->pseudoflavor
= pseudoflavor
;
848 test
= auth_domain_lookup(name
, &new->h
);
849 if (test
!= &new->h
) {
850 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
853 auth_domain_put(test
);
863 return ERR_PTR(stat
);
865 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor
);
868 read_u32_from_xdr_buf(struct xdr_buf
*buf
, int base
, u32
*obj
)
873 status
= read_bytes_from_xdr_buf(buf
, base
, &raw
, sizeof(*obj
));
880 /* It would be nice if this bit of code could be shared with the client.
882 * The client shouldn't malloc(), would have to pass in own memory.
883 * The server uses base of head iovec as read pointer, while the
884 * client uses separate pointer. */
886 unwrap_integ_data(struct svc_rqst
*rqstp
, struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
888 u32 integ_len
, rseqno
, maj_stat
;
890 struct xdr_netobj mic
;
891 struct xdr_buf integ_buf
;
895 /* NFS READ normally uses splice to send data in-place. However
896 * the data in cache can change after the reply's MIC is computed
897 * but before the RPC reply is sent. To prevent the client from
898 * rejecting the server-computed MIC in this somewhat rare case,
899 * do not use splice with the GSS integrity service.
901 clear_bit(RQ_SPLICE_OK
, &rqstp
->rq_flags
);
903 /* Did we already verify the signature on the original pass through? */
904 if (rqstp
->rq_deferred
)
907 integ_len
= svc_getnl(&buf
->head
[0]);
910 if (integ_len
> buf
->len
)
912 if (xdr_buf_subsegment(buf
, &integ_buf
, 0, integ_len
))
915 /* copy out mic... */
916 if (read_u32_from_xdr_buf(buf
, integ_len
, &mic
.len
))
918 if (mic
.len
> RPC_MAX_AUTH_SIZE
)
920 mic
.data
= kmalloc(mic
.len
, GFP_KERNEL
);
923 if (read_bytes_from_xdr_buf(buf
, integ_len
+ 4, mic
.data
, mic
.len
))
925 maj_stat
= gss_verify_mic(ctx
, &integ_buf
, &mic
);
926 if (maj_stat
!= GSS_S_COMPLETE
)
928 rseqno
= svc_getnl(&buf
->head
[0]);
931 /* trim off the mic and padding at the end before returning */
932 xdr_buf_trim(buf
, round_up_to_quad(mic
.len
) + 4);
939 trace_rpcgss_svc_unwrap_failed(rqstp
);
942 trace_rpcgss_svc_seqno_bad(rqstp
, seq
, rseqno
);
945 trace_rpcgss_svc_mic(rqstp
, maj_stat
);
950 total_buf_len(struct xdr_buf
*buf
)
952 return buf
->head
[0].iov_len
+ buf
->page_len
+ buf
->tail
[0].iov_len
;
956 fix_priv_head(struct xdr_buf
*buf
, int pad
)
958 if (buf
->page_len
== 0) {
959 /* We need to adjust head and buf->len in tandem in this
960 * case to make svc_defer() work--it finds the original
961 * buffer start using buf->len - buf->head[0].iov_len. */
962 buf
->head
[0].iov_len
-= pad
;
967 unwrap_priv_data(struct svc_rqst
*rqstp
, struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
969 u32 priv_len
, maj_stat
;
970 int pad
, remaining_len
, offset
;
973 clear_bit(RQ_SPLICE_OK
, &rqstp
->rq_flags
);
975 priv_len
= svc_getnl(&buf
->head
[0]);
976 if (rqstp
->rq_deferred
) {
977 /* Already decrypted last time through! The sequence number
978 * check at out_seq is unnecessary but harmless: */
981 /* buf->len is the number of bytes from the original start of the
982 * request to the end, where head[0].iov_len is just the bytes
983 * not yet read from the head, so these two values are different: */
984 remaining_len
= total_buf_len(buf
);
985 if (priv_len
> remaining_len
)
987 pad
= remaining_len
- priv_len
;
989 fix_priv_head(buf
, pad
);
991 maj_stat
= gss_unwrap(ctx
, 0, priv_len
, buf
);
992 pad
= priv_len
- buf
->len
;
993 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
994 * In the krb5p case, at least, the data ends up offset, so we need to
996 /* XXX: This is very inefficient. It would be better to either do
997 * this while we encrypt, or maybe in the receive code, if we can peak
998 * ahead and work out the service and mechanism there. */
999 offset
= xdr_pad_size(buf
->head
[0].iov_len
);
1001 buf
->buflen
= RPCSVC_MAXPAYLOAD
;
1002 xdr_shift_buf(buf
, offset
);
1003 fix_priv_head(buf
, pad
);
1005 if (maj_stat
!= GSS_S_COMPLETE
)
1008 rseqno
= svc_getnl(&buf
->head
[0]);
1014 trace_rpcgss_svc_unwrap_failed(rqstp
);
1017 trace_rpcgss_svc_seqno_bad(rqstp
, seq
, rseqno
);
1020 trace_rpcgss_svc_unwrap(rqstp
, maj_stat
);
1024 struct gss_svc_data
{
1025 /* decoded gss client cred: */
1026 struct rpc_gss_wire_cred clcred
;
1027 /* save a pointer to the beginning of the encoded verifier,
1028 * for use in encryption/checksumming in svcauth_gss_release: */
1034 svcauth_gss_set_client(struct svc_rqst
*rqstp
)
1036 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
1037 struct rsc
*rsci
= svcdata
->rsci
;
1038 struct rpc_gss_wire_cred
*gc
= &svcdata
->clcred
;
1041 rqstp
->rq_auth_stat
= rpc_autherr_badcred
;
1044 * A gss export can be specified either by:
1045 * export *(sec=krb5,rw)
1047 * export gss/krb5(rw)
1048 * The latter is deprecated; but for backwards compatibility reasons
1049 * the nfsd code will still fall back on trying it if the former
1050 * doesn't work; so we try to make both available to nfsd, below.
1052 rqstp
->rq_gssclient
= find_gss_auth_domain(rsci
->mechctx
, gc
->gc_svc
);
1053 if (rqstp
->rq_gssclient
== NULL
)
1055 stat
= svcauth_unix_set_client(rqstp
);
1056 if (stat
== SVC_DROP
|| stat
== SVC_CLOSE
)
1059 rqstp
->rq_auth_stat
= rpc_auth_ok
;
1064 gss_write_init_verf(struct cache_detail
*cd
, struct svc_rqst
*rqstp
,
1065 struct xdr_netobj
*out_handle
, int *major_status
)
1070 if (*major_status
!= GSS_S_COMPLETE
)
1071 return gss_write_null_verf(rqstp
);
1072 rsci
= gss_svc_searchbyctx(cd
, out_handle
);
1074 *major_status
= GSS_S_NO_CONTEXT
;
1075 return gss_write_null_verf(rqstp
);
1077 rc
= gss_write_verf(rqstp
, rsci
->mechctx
, GSS_SEQ_WIN
);
1078 cache_put(&rsci
->h
, cd
);
1083 gss_read_common_verf(struct rpc_gss_wire_cred
*gc
,
1084 struct kvec
*argv
, __be32
*authp
,
1085 struct xdr_netobj
*in_handle
)
1087 /* Read the verifier; should be NULL: */
1088 *authp
= rpc_autherr_badverf
;
1089 if (argv
->iov_len
< 2 * 4)
1091 if (svc_getnl(argv
) != RPC_AUTH_NULL
)
1093 if (svc_getnl(argv
) != 0)
1095 /* Martial context handle and token for upcall: */
1096 *authp
= rpc_autherr_badcred
;
1097 if (gc
->gc_proc
== RPC_GSS_PROC_INIT
&& gc
->gc_ctx
.len
!= 0)
1099 if (dup_netobj(in_handle
, &gc
->gc_ctx
))
1101 *authp
= rpc_autherr_badverf
;
1107 gss_read_verf(struct rpc_gss_wire_cred
*gc
,
1108 struct kvec
*argv
, __be32
*authp
,
1109 struct xdr_netobj
*in_handle
,
1110 struct xdr_netobj
*in_token
)
1112 struct xdr_netobj tmpobj
;
1115 res
= gss_read_common_verf(gc
, argv
, authp
, in_handle
);
1119 if (svc_safe_getnetobj(argv
, &tmpobj
)) {
1120 kfree(in_handle
->data
);
1123 if (dup_netobj(in_token
, &tmpobj
)) {
1124 kfree(in_handle
->data
);
1131 static void gss_free_in_token_pages(struct gssp_in_token
*in_token
)
1137 inlen
= in_token
->page_len
;
1139 if (in_token
->pages
[i
])
1140 put_page(in_token
->pages
[i
]);
1141 inlen
-= inlen
> PAGE_SIZE
? PAGE_SIZE
: inlen
;
1144 kfree(in_token
->pages
);
1145 in_token
->pages
= NULL
;
1148 static int gss_read_proxy_verf(struct svc_rqst
*rqstp
,
1149 struct rpc_gss_wire_cred
*gc
,
1150 struct xdr_netobj
*in_handle
,
1151 struct gssp_in_token
*in_token
)
1153 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1154 unsigned int length
, pgto_offs
, pgfrom_offs
;
1155 int pages
, i
, res
, pgto
, pgfrom
;
1156 size_t inlen
, to_offs
, from_offs
;
1158 res
= gss_read_common_verf(gc
, argv
, &rqstp
->rq_auth_stat
, in_handle
);
1162 inlen
= svc_getnl(argv
);
1163 if (inlen
> (argv
->iov_len
+ rqstp
->rq_arg
.page_len
))
1166 pages
= DIV_ROUND_UP(inlen
, PAGE_SIZE
);
1167 in_token
->pages
= kcalloc(pages
, sizeof(struct page
*), GFP_KERNEL
);
1168 if (!in_token
->pages
)
1170 in_token
->page_base
= 0;
1171 in_token
->page_len
= inlen
;
1172 for (i
= 0; i
< pages
; i
++) {
1173 in_token
->pages
[i
] = alloc_page(GFP_KERNEL
);
1174 if (!in_token
->pages
[i
]) {
1175 gss_free_in_token_pages(in_token
);
1180 length
= min_t(unsigned int, inlen
, argv
->iov_len
);
1181 memcpy(page_address(in_token
->pages
[0]), argv
->iov_base
, length
);
1185 from_offs
= rqstp
->rq_arg
.page_base
;
1187 pgto
= to_offs
>> PAGE_SHIFT
;
1188 pgfrom
= from_offs
>> PAGE_SHIFT
;
1189 pgto_offs
= to_offs
& ~PAGE_MASK
;
1190 pgfrom_offs
= from_offs
& ~PAGE_MASK
;
1192 length
= min_t(unsigned int, inlen
,
1193 min_t(unsigned int, PAGE_SIZE
- pgto_offs
,
1194 PAGE_SIZE
- pgfrom_offs
));
1195 memcpy(page_address(in_token
->pages
[pgto
]) + pgto_offs
,
1196 page_address(rqstp
->rq_arg
.pages
[pgfrom
]) + pgfrom_offs
,
1200 from_offs
+= length
;
1207 gss_write_resv(struct kvec
*resv
, size_t size_limit
,
1208 struct xdr_netobj
*out_handle
, struct xdr_netobj
*out_token
,
1209 int major_status
, int minor_status
)
1211 if (resv
->iov_len
+ 4 > size_limit
)
1213 svc_putnl(resv
, RPC_SUCCESS
);
1214 if (svc_safe_putnetobj(resv
, out_handle
))
1216 if (resv
->iov_len
+ 3 * 4 > size_limit
)
1218 svc_putnl(resv
, major_status
);
1219 svc_putnl(resv
, minor_status
);
1220 svc_putnl(resv
, GSS_SEQ_WIN
);
1221 if (svc_safe_putnetobj(resv
, out_token
))
1227 * Having read the cred already and found we're in the context
1228 * initiation case, read the verifier and initiate (or check the results
1229 * of) upcalls to userspace for help with context initiation. If
1230 * the upcall results are available, write the verifier and result.
1231 * Otherwise, drop the request pending an answer to the upcall.
1233 static int svcauth_gss_legacy_init(struct svc_rqst
*rqstp
,
1234 struct rpc_gss_wire_cred
*gc
)
1236 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1237 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1238 struct rsi
*rsip
, rsikey
;
1240 struct sunrpc_net
*sn
= net_generic(SVC_NET(rqstp
), sunrpc_net_id
);
1242 memset(&rsikey
, 0, sizeof(rsikey
));
1243 ret
= gss_read_verf(gc
, argv
, &rqstp
->rq_auth_stat
,
1244 &rsikey
.in_handle
, &rsikey
.in_token
);
1248 /* Perform upcall, or find upcall result: */
1249 rsip
= rsi_lookup(sn
->rsi_cache
, &rsikey
);
1253 if (cache_check(sn
->rsi_cache
, &rsip
->h
, &rqstp
->rq_chandle
) < 0)
1254 /* No upcall result: */
1258 /* Got an answer to the upcall; use it: */
1259 if (gss_write_init_verf(sn
->rsc_cache
, rqstp
,
1260 &rsip
->out_handle
, &rsip
->major_status
))
1262 if (gss_write_resv(resv
, PAGE_SIZE
,
1263 &rsip
->out_handle
, &rsip
->out_token
,
1264 rsip
->major_status
, rsip
->minor_status
))
1269 cache_put(&rsip
->h
, sn
->rsi_cache
);
1273 static int gss_proxy_save_rsc(struct cache_detail
*cd
,
1274 struct gssp_upcall_data
*ud
,
1277 struct rsc rsci
, *rscp
= NULL
;
1278 static atomic64_t ctxhctr
;
1280 struct gss_api_mech
*gm
= NULL
;
1284 memset(&rsci
, 0, sizeof(rsci
));
1285 /* context handle */
1287 /* the handle needs to be just a unique id,
1288 * use a static counter */
1289 ctxh
= atomic64_inc_return(&ctxhctr
);
1291 /* make a copy for the caller */
1294 /* make a copy for the rsc cache */
1295 if (dup_to_netobj(&rsci
.handle
, (char *)handle
, sizeof(uint64_t)))
1297 rscp
= rsc_lookup(cd
, &rsci
);
1302 if (!ud
->found_creds
) {
1303 /* userspace seem buggy, we should always get at least a
1304 * mapping to nobody */
1307 struct timespec64 boot
;
1310 rsci
.cred
= ud
->creds
;
1311 memset(&ud
->creds
, 0, sizeof(struct svc_cred
));
1313 status
= -EOPNOTSUPP
;
1314 /* get mech handle from OID */
1315 gm
= gss_mech_get_by_OID(&ud
->mech_oid
);
1318 rsci
.cred
.cr_gss_mech
= gm
;
1321 /* mech-specific data: */
1322 status
= gss_import_sec_context(ud
->out_handle
.data
,
1325 &expiry
, GFP_KERNEL
);
1329 getboottime64(&boot
);
1330 expiry
-= boot
.tv_sec
;
1333 rsci
.h
.expiry_time
= expiry
;
1334 rscp
= rsc_update(cd
, &rsci
, rscp
);
1339 cache_put(&rscp
->h
, cd
);
1345 static int svcauth_gss_proxy_init(struct svc_rqst
*rqstp
,
1346 struct rpc_gss_wire_cred
*gc
)
1348 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1349 struct xdr_netobj cli_handle
;
1350 struct gssp_upcall_data ud
;
1354 struct net
*net
= SVC_NET(rqstp
);
1355 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1357 memset(&ud
, 0, sizeof(ud
));
1358 ret
= gss_read_proxy_verf(rqstp
, gc
, &ud
.in_handle
, &ud
.in_token
);
1364 /* Perform synchronous upcall to gss-proxy */
1365 status
= gssp_accept_sec_context_upcall(net
, &ud
);
1369 trace_rpcgss_svc_accept_upcall(rqstp
, ud
.major_status
, ud
.minor_status
);
1371 switch (ud
.major_status
) {
1372 case GSS_S_CONTINUE_NEEDED
:
1373 cli_handle
= ud
.out_handle
;
1375 case GSS_S_COMPLETE
:
1376 status
= gss_proxy_save_rsc(sn
->rsc_cache
, &ud
, &handle
);
1379 cli_handle
.data
= (u8
*)&handle
;
1380 cli_handle
.len
= sizeof(handle
);
1386 /* Got an answer to the upcall; use it: */
1387 if (gss_write_init_verf(sn
->rsc_cache
, rqstp
,
1388 &cli_handle
, &ud
.major_status
))
1390 if (gss_write_resv(resv
, PAGE_SIZE
,
1391 &cli_handle
, &ud
.out_token
,
1392 ud
.major_status
, ud
.minor_status
))
1397 gss_free_in_token_pages(&ud
.in_token
);
1398 gssp_free_upcall_data(&ud
);
1403 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1404 * it to be changed if it's currently undefined (-1). If it's any other value
1405 * then return -EBUSY unless the type wouldn't have changed anyway.
1407 static int set_gss_proxy(struct net
*net
, int type
)
1409 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1412 WARN_ON_ONCE(type
!= 0 && type
!= 1);
1413 ret
= cmpxchg(&sn
->use_gss_proxy
, -1, type
);
1414 if (ret
!= -1 && ret
!= type
)
1419 static bool use_gss_proxy(struct net
*net
)
1421 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1423 /* If use_gss_proxy is still undefined, then try to disable it */
1424 if (sn
->use_gss_proxy
== -1)
1425 set_gss_proxy(net
, 0);
1426 return sn
->use_gss_proxy
;
1429 #ifdef CONFIG_PROC_FS
1431 static ssize_t
write_gssp(struct file
*file
, const char __user
*buf
,
1432 size_t count
, loff_t
*ppos
)
1434 struct net
*net
= PDE_DATA(file_inode(file
));
1439 if (*ppos
|| count
> sizeof(tbuf
)-1)
1441 if (copy_from_user(tbuf
, buf
, count
))
1445 res
= kstrtoul(tbuf
, 0, &i
);
1450 res
= set_gssp_clnt(net
);
1453 res
= set_gss_proxy(net
, 1);
1459 static ssize_t
read_gssp(struct file
*file
, char __user
*buf
,
1460 size_t count
, loff_t
*ppos
)
1462 struct net
*net
= PDE_DATA(file_inode(file
));
1463 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1464 unsigned long p
= *ppos
;
1468 snprintf(tbuf
, sizeof(tbuf
), "%d\n", sn
->use_gss_proxy
);
1475 if (copy_to_user(buf
, (void *)(tbuf
+p
), len
))
1481 static const struct proc_ops use_gss_proxy_proc_ops
= {
1482 .proc_open
= nonseekable_open
,
1483 .proc_write
= write_gssp
,
1484 .proc_read
= read_gssp
,
1487 static int create_use_gss_proxy_proc_entry(struct net
*net
)
1489 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1490 struct proc_dir_entry
**p
= &sn
->use_gssp_proc
;
1492 sn
->use_gss_proxy
= -1;
1493 *p
= proc_create_data("use-gss-proxy", S_IFREG
| 0600,
1495 &use_gss_proxy_proc_ops
, net
);
1502 static void destroy_use_gss_proxy_proc_entry(struct net
*net
)
1504 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1506 if (sn
->use_gssp_proc
) {
1507 remove_proc_entry("use-gss-proxy", sn
->proc_net_rpc
);
1508 clear_gssp_clnt(sn
);
1511 #else /* CONFIG_PROC_FS */
1513 static int create_use_gss_proxy_proc_entry(struct net
*net
)
1518 static void destroy_use_gss_proxy_proc_entry(struct net
*net
) {}
1520 #endif /* CONFIG_PROC_FS */
1523 * Accept an rpcsec packet.
1524 * If context establishment, punt to user space
1525 * If data exchange, verify/decrypt
1526 * If context destruction, handle here
1527 * In the context establishment and destruction case we encode
1528 * response here and return SVC_COMPLETE.
1531 svcauth_gss_accept(struct svc_rqst
*rqstp
)
1533 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1534 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1536 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
1537 struct rpc_gss_wire_cred
*gc
;
1538 struct rsc
*rsci
= NULL
;
1540 __be32
*reject_stat
= resv
->iov_base
+ resv
->iov_len
;
1542 struct sunrpc_net
*sn
= net_generic(SVC_NET(rqstp
), sunrpc_net_id
);
1544 rqstp
->rq_auth_stat
= rpc_autherr_badcred
;
1546 svcdata
= kmalloc(sizeof(*svcdata
), GFP_KERNEL
);
1549 rqstp
->rq_auth_data
= svcdata
;
1550 svcdata
->verf_start
= NULL
;
1551 svcdata
->rsci
= NULL
;
1552 gc
= &svcdata
->clcred
;
1554 /* start of rpc packet is 7 u32's back from here:
1555 * xid direction rpcversion prog vers proc flavour
1557 rpcstart
= argv
->iov_base
;
1561 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1562 * at least 5 u32s, and is preceded by length, so that makes 6.
1565 if (argv
->iov_len
< 5 * 4)
1567 crlen
= svc_getnl(argv
);
1568 if (svc_getnl(argv
) != RPC_GSS_VERSION
)
1570 gc
->gc_proc
= svc_getnl(argv
);
1571 gc
->gc_seq
= svc_getnl(argv
);
1572 gc
->gc_svc
= svc_getnl(argv
);
1573 if (svc_safe_getnetobj(argv
, &gc
->gc_ctx
))
1575 if (crlen
!= round_up_to_quad(gc
->gc_ctx
.len
) + 5 * 4)
1578 if ((gc
->gc_proc
!= RPC_GSS_PROC_DATA
) && (rqstp
->rq_proc
!= 0))
1581 rqstp
->rq_auth_stat
= rpc_autherr_badverf
;
1582 switch (gc
->gc_proc
) {
1583 case RPC_GSS_PROC_INIT
:
1584 case RPC_GSS_PROC_CONTINUE_INIT
:
1585 if (use_gss_proxy(SVC_NET(rqstp
)))
1586 return svcauth_gss_proxy_init(rqstp
, gc
);
1588 return svcauth_gss_legacy_init(rqstp
, gc
);
1589 case RPC_GSS_PROC_DATA
:
1590 case RPC_GSS_PROC_DESTROY
:
1591 /* Look up the context, and check the verifier: */
1592 rqstp
->rq_auth_stat
= rpcsec_gsserr_credproblem
;
1593 rsci
= gss_svc_searchbyctx(sn
->rsc_cache
, &gc
->gc_ctx
);
1596 switch (gss_verify_header(rqstp
, rsci
, rpcstart
, gc
)) {
1606 rqstp
->rq_auth_stat
= rpc_autherr_rejectedcred
;
1610 /* now act upon the command: */
1611 switch (gc
->gc_proc
) {
1612 case RPC_GSS_PROC_DESTROY
:
1613 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1615 /* Delete the entry from the cache_list and call cache_put */
1616 sunrpc_cache_unhash(sn
->rsc_cache
, &rsci
->h
);
1617 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1619 svc_putnl(resv
, RPC_SUCCESS
);
1621 case RPC_GSS_PROC_DATA
:
1622 rqstp
->rq_auth_stat
= rpcsec_gsserr_ctxproblem
;
1623 svcdata
->verf_start
= resv
->iov_base
+ resv
->iov_len
;
1624 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1626 rqstp
->rq_cred
= rsci
->cred
;
1627 get_group_info(rsci
->cred
.cr_group_info
);
1628 rqstp
->rq_auth_stat
= rpc_autherr_badcred
;
1629 switch (gc
->gc_svc
) {
1630 case RPC_GSS_SVC_NONE
:
1632 case RPC_GSS_SVC_INTEGRITY
:
1633 /* placeholders for length and seq. number: */
1636 if (unwrap_integ_data(rqstp
, &rqstp
->rq_arg
,
1637 gc
->gc_seq
, rsci
->mechctx
))
1639 rqstp
->rq_auth_slack
= RPC_MAX_AUTH_SIZE
;
1641 case RPC_GSS_SVC_PRIVACY
:
1642 /* placeholders for length and seq. number: */
1645 if (unwrap_priv_data(rqstp
, &rqstp
->rq_arg
,
1646 gc
->gc_seq
, rsci
->mechctx
))
1648 rqstp
->rq_auth_slack
= RPC_MAX_AUTH_SIZE
* 2;
1653 svcdata
->rsci
= rsci
;
1654 cache_get(&rsci
->h
);
1655 rqstp
->rq_cred
.cr_flavor
= gss_svc_to_pseudoflavor(
1656 rsci
->mechctx
->mech_type
,
1660 trace_rpcgss_svc_authenticate(rqstp
, gc
);
1667 /* Restore write pointer to its original value: */
1668 xdr_ressize_check(rqstp
, reject_stat
);
1678 cache_put(&rsci
->h
, sn
->rsc_cache
);
1683 svcauth_gss_prepare_to_wrap(struct xdr_buf
*resbuf
, struct gss_svc_data
*gsd
)
1688 p
= gsd
->verf_start
;
1689 gsd
->verf_start
= NULL
;
1691 /* If the reply stat is nonzero, don't wrap: */
1692 if (*(p
-1) != rpc_success
)
1694 /* Skip the verifier: */
1696 verf_len
= ntohl(*p
++);
1697 p
+= XDR_QUADLEN(verf_len
);
1698 /* move accept_stat to right place: */
1699 memcpy(p
, p
+ 2, 4);
1700 /* Also don't wrap if the accept stat is nonzero: */
1701 if (*p
!= rpc_success
) {
1702 resbuf
->head
[0].iov_len
-= 2 * 4;
1710 svcauth_gss_wrap_resp_integ(struct svc_rqst
*rqstp
)
1712 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1713 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1714 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1715 struct xdr_buf integ_buf
;
1716 struct xdr_netobj mic
;
1719 int integ_offset
, integ_len
;
1722 p
= svcauth_gss_prepare_to_wrap(resbuf
, gsd
);
1725 integ_offset
= (u8
*)(p
+ 1) - (u8
*)resbuf
->head
[0].iov_base
;
1726 integ_len
= resbuf
->len
- integ_offset
;
1729 *p
++ = htonl(integ_len
);
1730 *p
++ = htonl(gc
->gc_seq
);
1731 if (xdr_buf_subsegment(resbuf
, &integ_buf
, integ_offset
, integ_len
)) {
1735 if (resbuf
->tail
[0].iov_base
== NULL
) {
1736 if (resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1738 resbuf
->tail
[0].iov_base
= resbuf
->head
[0].iov_base
1739 + resbuf
->head
[0].iov_len
;
1740 resbuf
->tail
[0].iov_len
= 0;
1742 resv
= &resbuf
->tail
[0];
1743 mic
.data
= (u8
*)resv
->iov_base
+ resv
->iov_len
+ 4;
1744 if (gss_get_mic(gsd
->rsci
->mechctx
, &integ_buf
, &mic
))
1746 svc_putnl(resv
, mic
.len
);
1747 memset(mic
.data
+ mic
.len
, 0,
1748 round_up_to_quad(mic
.len
) - mic
.len
);
1749 resv
->iov_len
+= XDR_QUADLEN(mic
.len
) << 2;
1750 /* not strictly required: */
1751 resbuf
->len
+= XDR_QUADLEN(mic
.len
) << 2;
1752 if (resv
->iov_len
> PAGE_SIZE
)
1761 svcauth_gss_wrap_resp_priv(struct svc_rqst
*rqstp
)
1763 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1764 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1765 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1766 struct page
**inpages
= NULL
;
1771 p
= svcauth_gss_prepare_to_wrap(resbuf
, gsd
);
1775 offset
= (u8
*)p
- (u8
*)resbuf
->head
[0].iov_base
;
1776 *p
++ = htonl(gc
->gc_seq
);
1777 inpages
= resbuf
->pages
;
1778 /* XXX: Would be better to write some xdr helper functions for
1779 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1782 * If there is currently tail data, make sure there is
1783 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1784 * the page, and move the current tail data such that
1785 * there is RPC_MAX_AUTH_SIZE slack space available in
1786 * both the head and tail.
1788 if (resbuf
->tail
[0].iov_base
) {
1789 if (resbuf
->tail
[0].iov_base
>=
1790 resbuf
->head
[0].iov_base
+ PAGE_SIZE
)
1792 if (resbuf
->tail
[0].iov_base
< resbuf
->head
[0].iov_base
)
1794 if (resbuf
->tail
[0].iov_len
+ resbuf
->head
[0].iov_len
1795 + 2 * RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1797 memmove(resbuf
->tail
[0].iov_base
+ RPC_MAX_AUTH_SIZE
,
1798 resbuf
->tail
[0].iov_base
,
1799 resbuf
->tail
[0].iov_len
);
1800 resbuf
->tail
[0].iov_base
+= RPC_MAX_AUTH_SIZE
;
1803 * If there is no current tail data, make sure there is
1804 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1805 * allotted page, and set up tail information such that there
1806 * is RPC_MAX_AUTH_SIZE slack space available in both the
1809 if (resbuf
->tail
[0].iov_base
== NULL
) {
1810 if (resbuf
->head
[0].iov_len
+ 2*RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1812 resbuf
->tail
[0].iov_base
= resbuf
->head
[0].iov_base
1813 + resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
;
1814 resbuf
->tail
[0].iov_len
= 0;
1816 if (gss_wrap(gsd
->rsci
->mechctx
, offset
, resbuf
, inpages
))
1818 *len
= htonl(resbuf
->len
- offset
);
1819 pad
= 3 - ((resbuf
->len
- offset
- 1)&3);
1820 p
= (__be32
*)(resbuf
->tail
[0].iov_base
+ resbuf
->tail
[0].iov_len
);
1822 resbuf
->tail
[0].iov_len
+= pad
;
1828 svcauth_gss_release(struct svc_rqst
*rqstp
)
1830 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1831 struct rpc_gss_wire_cred
*gc
;
1832 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1834 struct sunrpc_net
*sn
= net_generic(SVC_NET(rqstp
), sunrpc_net_id
);
1839 if (gc
->gc_proc
!= RPC_GSS_PROC_DATA
)
1841 /* Release can be called twice, but we only wrap once. */
1842 if (gsd
->verf_start
== NULL
)
1844 /* normally not set till svc_send, but we need it here: */
1845 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1847 resbuf
->len
= total_buf_len(resbuf
);
1848 switch (gc
->gc_svc
) {
1849 case RPC_GSS_SVC_NONE
:
1851 case RPC_GSS_SVC_INTEGRITY
:
1852 stat
= svcauth_gss_wrap_resp_integ(rqstp
);
1856 case RPC_GSS_SVC_PRIVACY
:
1857 stat
= svcauth_gss_wrap_resp_priv(rqstp
);
1862 * For any other gc_svc value, svcauth_gss_accept() already set
1863 * the auth_error appropriately; just fall through:
1870 if (rqstp
->rq_client
)
1871 auth_domain_put(rqstp
->rq_client
);
1872 rqstp
->rq_client
= NULL
;
1873 if (rqstp
->rq_gssclient
)
1874 auth_domain_put(rqstp
->rq_gssclient
);
1875 rqstp
->rq_gssclient
= NULL
;
1876 if (rqstp
->rq_cred
.cr_group_info
)
1877 put_group_info(rqstp
->rq_cred
.cr_group_info
);
1878 rqstp
->rq_cred
.cr_group_info
= NULL
;
1879 if (gsd
&& gsd
->rsci
) {
1880 cache_put(&gsd
->rsci
->h
, sn
->rsc_cache
);
1887 svcauth_gss_domain_release_rcu(struct rcu_head
*head
)
1889 struct auth_domain
*dom
= container_of(head
, struct auth_domain
, rcu_head
);
1890 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
1897 svcauth_gss_domain_release(struct auth_domain
*dom
)
1899 call_rcu(&dom
->rcu_head
, svcauth_gss_domain_release_rcu
);
1902 static struct auth_ops svcauthops_gss
= {
1903 .name
= "rpcsec_gss",
1904 .owner
= THIS_MODULE
,
1905 .flavour
= RPC_AUTH_GSS
,
1906 .accept
= svcauth_gss_accept
,
1907 .release
= svcauth_gss_release
,
1908 .domain_release
= svcauth_gss_domain_release
,
1909 .set_client
= svcauth_gss_set_client
,
1912 static int rsi_cache_create_net(struct net
*net
)
1914 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1915 struct cache_detail
*cd
;
1918 cd
= cache_create_net(&rsi_cache_template
, net
);
1921 err
= cache_register_net(cd
, net
);
1923 cache_destroy_net(cd
, net
);
1930 static void rsi_cache_destroy_net(struct net
*net
)
1932 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1933 struct cache_detail
*cd
= sn
->rsi_cache
;
1935 sn
->rsi_cache
= NULL
;
1937 cache_unregister_net(cd
, net
);
1938 cache_destroy_net(cd
, net
);
1941 static int rsc_cache_create_net(struct net
*net
)
1943 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1944 struct cache_detail
*cd
;
1947 cd
= cache_create_net(&rsc_cache_template
, net
);
1950 err
= cache_register_net(cd
, net
);
1952 cache_destroy_net(cd
, net
);
1959 static void rsc_cache_destroy_net(struct net
*net
)
1961 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1962 struct cache_detail
*cd
= sn
->rsc_cache
;
1964 sn
->rsc_cache
= NULL
;
1966 cache_unregister_net(cd
, net
);
1967 cache_destroy_net(cd
, net
);
1971 gss_svc_init_net(struct net
*net
)
1975 rv
= rsc_cache_create_net(net
);
1978 rv
= rsi_cache_create_net(net
);
1981 rv
= create_use_gss_proxy_proc_entry(net
);
1986 rsi_cache_destroy_net(net
);
1988 rsc_cache_destroy_net(net
);
1993 gss_svc_shutdown_net(struct net
*net
)
1995 destroy_use_gss_proxy_proc_entry(net
);
1996 rsi_cache_destroy_net(net
);
1997 rsc_cache_destroy_net(net
);
2003 return svc_auth_register(RPC_AUTH_GSS
, &svcauthops_gss
);
2007 gss_svc_shutdown(void)
2009 svc_auth_unregister(RPC_AUTH_GSS
);