2 * Neil Brown <neilb@cse.unsw.edu.au>
3 * J. Bruce Fields <bfields@umich.edu>
4 * Andy Adamson <andros@umich.edu>
5 * Dug Song <dugsong@monkey.org>
7 * RPCSEC_GSS server authentication.
8 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
11 * The RPCSEC_GSS involves three stages:
14 * 3/ context destruction
16 * Context creation is handled largely by upcalls to user-space.
17 * In particular, GSS_Accept_sec_context is handled by an upcall
18 * Data exchange is handled entirely within the kernel
19 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
20 * Context destruction is handled in-kernel
21 * GSS_Delete_sec_context is in-kernel
23 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
24 * The context handle and gss_token are used as a key into the rpcsec_init cache.
25 * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
26 * being major_status, minor_status, context_handle, reply_token.
27 * These are sent back to the client.
28 * Sequence window management is handled by the kernel. The window size if currently
29 * a compile time constant.
31 * When user-space is happy that a context is established, it places an entry
32 * in the rpcsec_context cache. The key for this cache is the context_handle.
33 * The content includes:
34 * uid/gidlist - for determining access rights
36 * mechanism specific information, such as a key
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>
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"
54 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
55 # define RPCDBG_FACILITY RPCDBG_AUTH
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
;
81 static struct rsi
*rsi_update(struct cache_detail
*cd
, struct rsi
*new, struct rsi
*old
);
82 static struct rsi
*rsi_lookup(struct cache_detail
*cd
, struct rsi
*item
);
84 static void rsi_free(struct rsi
*rsii
)
86 kfree(rsii
->in_handle
.data
);
87 kfree(rsii
->in_token
.data
);
88 kfree(rsii
->out_handle
.data
);
89 kfree(rsii
->out_token
.data
);
92 static void rsi_put(struct kref
*ref
)
94 struct rsi
*rsii
= container_of(ref
, struct rsi
, h
.ref
);
99 static inline int rsi_hash(struct rsi
*item
)
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
);
105 static int rsi_match(struct cache_head
*a
, struct cache_head
*b
)
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
);
113 static int dup_to_netobj(struct xdr_netobj
*dst
, char *src
, int len
)
116 dst
->data
= (len
? kmemdup(src
, len
, GFP_KERNEL
) : NULL
);
117 if (len
&& !dst
->data
)
122 static inline int dup_netobj(struct xdr_netobj
*dst
, struct xdr_netobj
*src
)
124 return dup_to_netobj(dst
, src
->data
, src
->len
);
127 static void rsi_init(struct cache_head
*cnew
, struct cache_head
*citem
)
129 struct rsi
*new = container_of(cnew
, struct rsi
, h
);
130 struct rsi
*item
= container_of(citem
, struct rsi
, h
);
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
;
146 static void update_rsi(struct cache_head
*cnew
, struct cache_head
*citem
)
148 struct rsi
*new = container_of(cnew
, struct rsi
, h
);
149 struct rsi
*item
= container_of(citem
, struct rsi
, h
);
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
;
161 new->major_status
= item
->major_status
;
162 new->minor_status
= item
->minor_status
;
165 static struct cache_head
*rsi_alloc(void)
167 struct rsi
*rsii
= kmalloc(sizeof(*rsii
), GFP_KERNEL
);
174 static void rsi_request(struct cache_detail
*cd
,
175 struct cache_head
*h
,
176 char **bpp
, int *blen
)
178 struct rsi
*rsii
= container_of(h
, struct rsi
, h
);
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
);
185 static int rsi_parse(struct cache_detail
*cd
,
186 char *mesg
, int mlen
)
188 /* context token expiry major minor context token */
192 struct rsi rsii
, *rsip
= NULL
;
194 int status
= -EINVAL
;
196 memset(&rsii
, 0, sizeof(rsii
));
198 len
= qword_get(&mesg
, buf
, mlen
);
202 if (dup_to_netobj(&rsii
.in_handle
, buf
, len
))
206 len
= qword_get(&mesg
, buf
, mlen
);
211 if (dup_to_netobj(&rsii
.in_token
, buf
, len
))
214 rsip
= rsi_lookup(cd
, &rsii
);
220 expiry
= get_expiry(&mesg
);
226 len
= qword_get(&mesg
, buf
, mlen
);
229 rsii
.major_status
= simple_strtoul(buf
, &ep
, 10);
232 len
= qword_get(&mesg
, buf
, mlen
);
235 rsii
.minor_status
= simple_strtoul(buf
, &ep
, 10);
240 len
= qword_get(&mesg
, buf
, mlen
);
244 if (dup_to_netobj(&rsii
.out_handle
, buf
, len
))
248 len
= qword_get(&mesg
, buf
, mlen
);
253 if (dup_to_netobj(&rsii
.out_token
, buf
, len
))
255 rsii
.h
.expiry_time
= expiry
;
256 rsip
= rsi_update(cd
, &rsii
, rsip
);
261 cache_put(&rsip
->h
, cd
);
267 static 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
,
276 .update
= update_rsi
,
280 static struct rsi
*rsi_lookup(struct cache_detail
*cd
, struct rsi
*item
)
282 struct cache_head
*ch
;
283 int hash
= rsi_hash(item
);
285 ch
= sunrpc_cache_lookup(cd
, &item
->h
, hash
);
287 return container_of(ch
, struct rsi
, h
);
292 static struct rsi
*rsi_update(struct cache_detail
*cd
, struct rsi
*new, struct rsi
*old
)
294 struct cache_head
*ch
;
295 int hash
= rsi_hash(new);
297 ch
= sunrpc_cache_update(cd
, &new->h
,
300 return container_of(ch
, struct rsi
, h
);
307 * The rpcsec_context cache is used to store a context that is
308 * used in data exchange.
309 * The key is a context handle. The content is:
310 * uid, gidlist, mechanism, service-set, mech-specific-data
313 #define RSC_HASHBITS 10
314 #define RSC_HASHMAX (1<<RSC_HASHBITS)
316 #define GSS_SEQ_WIN 128
318 struct gss_svc_seq_data
{
319 /* highest seq number seen so far: */
321 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
322 * sd_win is nonzero iff sequence number i has been seen already: */
323 unsigned long sd_win
[GSS_SEQ_WIN
/BITS_PER_LONG
];
329 struct xdr_netobj handle
;
330 struct svc_cred cred
;
331 struct gss_svc_seq_data seqdata
;
332 struct gss_ctx
*mechctx
;
335 static struct rsc
*rsc_update(struct cache_detail
*cd
, struct rsc
*new, struct rsc
*old
);
336 static struct rsc
*rsc_lookup(struct cache_detail
*cd
, struct rsc
*item
);
338 static void rsc_free(struct rsc
*rsci
)
340 kfree(rsci
->handle
.data
);
342 gss_delete_sec_context(&rsci
->mechctx
);
343 free_svc_cred(&rsci
->cred
);
346 static void rsc_put(struct kref
*ref
)
348 struct rsc
*rsci
= container_of(ref
, struct rsc
, h
.ref
);
355 rsc_hash(struct rsc
*rsci
)
357 return hash_mem(rsci
->handle
.data
, rsci
->handle
.len
, RSC_HASHBITS
);
361 rsc_match(struct cache_head
*a
, struct cache_head
*b
)
363 struct rsc
*new = container_of(a
, struct rsc
, h
);
364 struct rsc
*tmp
= container_of(b
, struct rsc
, h
);
366 return netobj_equal(&new->handle
, &tmp
->handle
);
370 rsc_init(struct cache_head
*cnew
, struct cache_head
*ctmp
)
372 struct rsc
*new = container_of(cnew
, struct rsc
, h
);
373 struct rsc
*tmp
= container_of(ctmp
, struct rsc
, h
);
375 new->handle
.len
= tmp
->handle
.len
;
377 new->handle
.data
= tmp
->handle
.data
;
378 tmp
->handle
.data
= NULL
;
380 init_svc_cred(&new->cred
);
384 update_rsc(struct cache_head
*cnew
, struct cache_head
*ctmp
)
386 struct rsc
*new = container_of(cnew
, struct rsc
, h
);
387 struct rsc
*tmp
= container_of(ctmp
, struct rsc
, h
);
389 new->mechctx
= tmp
->mechctx
;
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
);
397 static struct cache_head
*
400 struct rsc
*rsci
= kmalloc(sizeof(*rsci
), GFP_KERNEL
);
407 static int rsc_parse(struct cache_detail
*cd
,
408 char *mesg
, int mlen
)
410 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
414 struct rsc rsci
, *rscp
= NULL
;
416 int status
= -EINVAL
;
417 struct gss_api_mech
*gm
= NULL
;
419 memset(&rsci
, 0, sizeof(rsci
));
421 len
= qword_get(&mesg
, buf
, mlen
);
422 if (len
< 0) goto out
;
424 if (dup_to_netobj(&rsci
.handle
, buf
, len
))
429 expiry
= get_expiry(&mesg
);
434 rscp
= rsc_lookup(cd
, &rsci
);
438 /* uid, or NEGATIVE */
439 rv
= get_int(&mesg
, &id
);
443 set_bit(CACHE_NEGATIVE
, &rsci
.h
.flags
);
448 * NOTE: we skip uid_valid()/gid_valid() checks here:
449 * instead, * -1 id's are later mapped to the
450 * (export-specific) anonymous id by nfsd_setuser.
452 * (But supplementary gid's get no such special
453 * treatment so are checked for validity here.)
456 rsci
.cred
.cr_uid
= make_kuid(&init_user_ns
, id
);
459 if (get_int(&mesg
, &id
))
461 rsci
.cred
.cr_gid
= make_kgid(&init_user_ns
, id
);
463 /* number of additional gid's */
464 if (get_int(&mesg
, &N
))
466 if (N
< 0 || N
> NGROUPS_MAX
)
469 rsci
.cred
.cr_group_info
= groups_alloc(N
);
470 if (rsci
.cred
.cr_group_info
== NULL
)
475 for (i
=0; i
<N
; i
++) {
477 if (get_int(&mesg
, &id
))
479 kgid
= make_kgid(&init_user_ns
, id
);
480 if (!gid_valid(kgid
))
482 rsci
.cred
.cr_group_info
->gid
[i
] = kgid
;
486 len
= qword_get(&mesg
, buf
, mlen
);
489 gm
= rsci
.cred
.cr_gss_mech
= gss_mech_get_by_name(buf
);
490 status
= -EOPNOTSUPP
;
495 /* mech-specific data: */
496 len
= qword_get(&mesg
, buf
, mlen
);
499 status
= gss_import_sec_context(buf
, len
, gm
, &rsci
.mechctx
,
504 /* get client name */
505 len
= qword_get(&mesg
, buf
, mlen
);
507 rsci
.cred
.cr_principal
= kstrdup(buf
, GFP_KERNEL
);
508 if (!rsci
.cred
.cr_principal
) {
515 rsci
.h
.expiry_time
= expiry
;
516 rscp
= rsc_update(cd
, &rsci
, rscp
);
521 cache_put(&rscp
->h
, cd
);
527 static struct cache_detail rsc_cache_template
= {
528 .owner
= THIS_MODULE
,
529 .hash_size
= RSC_HASHMAX
,
530 .name
= "auth.rpcsec.context",
531 .cache_put
= rsc_put
,
532 .cache_parse
= rsc_parse
,
535 .update
= update_rsc
,
539 static struct rsc
*rsc_lookup(struct cache_detail
*cd
, struct rsc
*item
)
541 struct cache_head
*ch
;
542 int hash
= rsc_hash(item
);
544 ch
= sunrpc_cache_lookup(cd
, &item
->h
, hash
);
546 return container_of(ch
, struct rsc
, h
);
551 static struct rsc
*rsc_update(struct cache_detail
*cd
, struct rsc
*new, struct rsc
*old
)
553 struct cache_head
*ch
;
554 int hash
= rsc_hash(new);
556 ch
= sunrpc_cache_update(cd
, &new->h
,
559 return container_of(ch
, struct rsc
, h
);
566 gss_svc_searchbyctx(struct cache_detail
*cd
, struct xdr_netobj
*handle
)
571 memset(&rsci
, 0, sizeof(rsci
));
572 if (dup_to_netobj(&rsci
.handle
, handle
->data
, handle
->len
))
574 found
= rsc_lookup(cd
, &rsci
);
578 if (cache_check(cd
, &found
->h
, NULL
))
583 /* Implements sequence number algorithm as specified in RFC 2203. */
585 gss_check_seq_num(struct rsc
*rsci
, int seq_num
)
587 struct gss_svc_seq_data
*sd
= &rsci
->seqdata
;
589 spin_lock(&sd
->sd_lock
);
590 if (seq_num
> sd
->sd_max
) {
591 if (seq_num
>= sd
->sd_max
+ GSS_SEQ_WIN
) {
592 memset(sd
->sd_win
,0,sizeof(sd
->sd_win
));
593 sd
->sd_max
= seq_num
;
594 } else while (sd
->sd_max
< seq_num
) {
596 __clear_bit(sd
->sd_max
% GSS_SEQ_WIN
, sd
->sd_win
);
598 __set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
);
600 } else if (seq_num
<= sd
->sd_max
- GSS_SEQ_WIN
) {
603 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
604 if (__test_and_set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
))
607 spin_unlock(&sd
->sd_lock
);
610 spin_unlock(&sd
->sd_lock
);
614 static inline u32
round_up_to_quad(u32 i
)
616 return (i
+ 3 ) & ~3;
620 svc_safe_getnetobj(struct kvec
*argv
, struct xdr_netobj
*o
)
624 if (argv
->iov_len
< 4)
626 o
->len
= svc_getnl(argv
);
627 l
= round_up_to_quad(o
->len
);
628 if (argv
->iov_len
< l
)
630 o
->data
= argv
->iov_base
;
637 svc_safe_putnetobj(struct kvec
*resv
, struct xdr_netobj
*o
)
641 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
643 svc_putnl(resv
, o
->len
);
644 p
= resv
->iov_base
+ resv
->iov_len
;
645 resv
->iov_len
+= round_up_to_quad(o
->len
);
646 if (resv
->iov_len
> PAGE_SIZE
)
648 memcpy(p
, o
->data
, o
->len
);
649 memset(p
+ o
->len
, 0, round_up_to_quad(o
->len
) - o
->len
);
654 * Verify the checksum on the header and return SVC_OK on success.
655 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
656 * or return SVC_DENIED and indicate error in authp.
659 gss_verify_header(struct svc_rqst
*rqstp
, struct rsc
*rsci
,
660 __be32
*rpcstart
, struct rpc_gss_wire_cred
*gc
, __be32
*authp
)
662 struct gss_ctx
*ctx_id
= rsci
->mechctx
;
663 struct xdr_buf rpchdr
;
664 struct xdr_netobj checksum
;
666 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
669 /* data to compute the checksum over: */
670 iov
.iov_base
= rpcstart
;
671 iov
.iov_len
= (u8
*)argv
->iov_base
- (u8
*)rpcstart
;
672 xdr_buf_from_iov(&iov
, &rpchdr
);
674 *authp
= rpc_autherr_badverf
;
675 if (argv
->iov_len
< 4)
677 flavor
= svc_getnl(argv
);
678 if (flavor
!= RPC_AUTH_GSS
)
680 if (svc_safe_getnetobj(argv
, &checksum
))
683 if (rqstp
->rq_deferred
) /* skip verification of revisited request */
685 if (gss_verify_mic(ctx_id
, &rpchdr
, &checksum
) != GSS_S_COMPLETE
) {
686 *authp
= rpcsec_gsserr_credproblem
;
690 if (gc
->gc_seq
> MAXSEQ
) {
691 dprintk("RPC: svcauth_gss: discarding request with "
692 "large sequence number %d\n", gc
->gc_seq
);
693 *authp
= rpcsec_gsserr_ctxproblem
;
696 if (!gss_check_seq_num(rsci
, gc
->gc_seq
)) {
697 dprintk("RPC: svcauth_gss: discarding request with "
698 "old sequence number %d\n", gc
->gc_seq
);
705 gss_write_null_verf(struct svc_rqst
*rqstp
)
709 svc_putnl(rqstp
->rq_res
.head
, RPC_AUTH_NULL
);
710 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
711 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
713 if (!xdr_ressize_check(rqstp
, p
))
719 gss_write_verf(struct svc_rqst
*rqstp
, struct gss_ctx
*ctx_id
, u32 seq
)
723 struct xdr_buf verf_data
;
724 struct xdr_netobj mic
;
729 svc_putnl(rqstp
->rq_res
.head
, RPC_AUTH_GSS
);
730 xdr_seq
= kmalloc(4, GFP_KERNEL
);
733 *xdr_seq
= htonl(seq
);
735 iov
.iov_base
= xdr_seq
;
737 xdr_buf_from_iov(&iov
, &verf_data
);
738 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
739 mic
.data
= (u8
*)(p
+ 1);
740 maj_stat
= gss_get_mic(ctx_id
, &verf_data
, &mic
);
741 if (maj_stat
!= GSS_S_COMPLETE
)
743 *p
++ = htonl(mic
.len
);
744 memset((u8
*)p
+ mic
.len
, 0, round_up_to_quad(mic
.len
) - mic
.len
);
745 p
+= XDR_QUADLEN(mic
.len
);
746 if (!xdr_ressize_check(rqstp
, p
))
755 struct auth_domain h
;
759 static struct auth_domain
*
760 find_gss_auth_domain(struct gss_ctx
*ctx
, u32 svc
)
764 name
= gss_service_to_auth_domain_name(ctx
->mech_type
, svc
);
767 return auth_domain_find(name
);
770 static struct auth_ops svcauthops_gss
;
772 u32
svcauth_gss_flavor(struct auth_domain
*dom
)
774 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
776 return gd
->pseudoflavor
;
779 EXPORT_SYMBOL_GPL(svcauth_gss_flavor
);
782 svcauth_gss_register_pseudoflavor(u32 pseudoflavor
, char * name
)
784 struct gss_domain
*new;
785 struct auth_domain
*test
;
788 new = kmalloc(sizeof(*new), GFP_KERNEL
);
791 kref_init(&new->h
.ref
);
792 new->h
.name
= kstrdup(name
, GFP_KERNEL
);
795 new->h
.flavour
= &svcauthops_gss
;
796 new->pseudoflavor
= pseudoflavor
;
799 test
= auth_domain_lookup(name
, &new->h
);
800 if (test
!= &new->h
) { /* Duplicate registration */
801 auth_domain_put(test
);
813 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor
);
816 read_u32_from_xdr_buf(struct xdr_buf
*buf
, int base
, u32
*obj
)
821 status
= read_bytes_from_xdr_buf(buf
, base
, &raw
, sizeof(*obj
));
828 /* It would be nice if this bit of code could be shared with the client.
830 * The client shouldn't malloc(), would have to pass in own memory.
831 * The server uses base of head iovec as read pointer, while the
832 * client uses separate pointer. */
834 unwrap_integ_data(struct svc_rqst
*rqstp
, struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
837 u32 integ_len
, maj_stat
;
838 struct xdr_netobj mic
;
839 struct xdr_buf integ_buf
;
841 /* NFS READ normally uses splice to send data in-place. However
842 * the data in cache can change after the reply's MIC is computed
843 * but before the RPC reply is sent. To prevent the client from
844 * rejecting the server-computed MIC in this somewhat rare case,
845 * do not use splice with the GSS integrity service.
847 clear_bit(RQ_SPLICE_OK
, &rqstp
->rq_flags
);
849 /* Did we already verify the signature on the original pass through? */
850 if (rqstp
->rq_deferred
)
853 integ_len
= svc_getnl(&buf
->head
[0]);
856 if (integ_len
> buf
->len
)
858 if (xdr_buf_subsegment(buf
, &integ_buf
, 0, integ_len
)) {
862 /* copy out mic... */
863 if (read_u32_from_xdr_buf(buf
, integ_len
, &mic
.len
))
865 if (mic
.len
> RPC_MAX_AUTH_SIZE
)
867 mic
.data
= kmalloc(mic
.len
, GFP_KERNEL
);
870 if (read_bytes_from_xdr_buf(buf
, integ_len
+ 4, mic
.data
, mic
.len
))
872 maj_stat
= gss_verify_mic(ctx
, &integ_buf
, &mic
);
873 if (maj_stat
!= GSS_S_COMPLETE
)
875 if (svc_getnl(&buf
->head
[0]) != seq
)
877 /* trim off the mic and padding at the end before returning */
878 xdr_buf_trim(buf
, round_up_to_quad(mic
.len
) + 4);
886 total_buf_len(struct xdr_buf
*buf
)
888 return buf
->head
[0].iov_len
+ buf
->page_len
+ buf
->tail
[0].iov_len
;
892 fix_priv_head(struct xdr_buf
*buf
, int pad
)
894 if (buf
->page_len
== 0) {
895 /* We need to adjust head and buf->len in tandem in this
896 * case to make svc_defer() work--it finds the original
897 * buffer start using buf->len - buf->head[0].iov_len. */
898 buf
->head
[0].iov_len
-= pad
;
903 unwrap_priv_data(struct svc_rqst
*rqstp
, struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
905 u32 priv_len
, maj_stat
;
906 int pad
, saved_len
, remaining_len
, offset
;
908 clear_bit(RQ_SPLICE_OK
, &rqstp
->rq_flags
);
910 priv_len
= svc_getnl(&buf
->head
[0]);
911 if (rqstp
->rq_deferred
) {
912 /* Already decrypted last time through! The sequence number
913 * check at out_seq is unnecessary but harmless: */
916 /* buf->len is the number of bytes from the original start of the
917 * request to the end, where head[0].iov_len is just the bytes
918 * not yet read from the head, so these two values are different: */
919 remaining_len
= total_buf_len(buf
);
920 if (priv_len
> remaining_len
)
922 pad
= remaining_len
- priv_len
;
924 fix_priv_head(buf
, pad
);
926 /* Maybe it would be better to give gss_unwrap a length parameter: */
927 saved_len
= buf
->len
;
929 maj_stat
= gss_unwrap(ctx
, 0, buf
);
930 pad
= priv_len
- buf
->len
;
931 buf
->len
= saved_len
;
933 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
934 * In the krb5p case, at least, the data ends up offset, so we need to
936 /* XXX: This is very inefficient. It would be better to either do
937 * this while we encrypt, or maybe in the receive code, if we can peak
938 * ahead and work out the service and mechanism there. */
939 offset
= buf
->head
[0].iov_len
% 4;
941 buf
->buflen
= RPCSVC_MAXPAYLOAD
;
942 xdr_shift_buf(buf
, offset
);
943 fix_priv_head(buf
, pad
);
945 if (maj_stat
!= GSS_S_COMPLETE
)
948 if (svc_getnl(&buf
->head
[0]) != seq
)
953 struct gss_svc_data
{
954 /* decoded gss client cred: */
955 struct rpc_gss_wire_cred clcred
;
956 /* save a pointer to the beginning of the encoded verifier,
957 * for use in encryption/checksumming in svcauth_gss_release: */
963 svcauth_gss_set_client(struct svc_rqst
*rqstp
)
965 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
966 struct rsc
*rsci
= svcdata
->rsci
;
967 struct rpc_gss_wire_cred
*gc
= &svcdata
->clcred
;
971 * A gss export can be specified either by:
972 * export *(sec=krb5,rw)
974 * export gss/krb5(rw)
975 * The latter is deprecated; but for backwards compatibility reasons
976 * the nfsd code will still fall back on trying it if the former
977 * doesn't work; so we try to make both available to nfsd, below.
979 rqstp
->rq_gssclient
= find_gss_auth_domain(rsci
->mechctx
, gc
->gc_svc
);
980 if (rqstp
->rq_gssclient
== NULL
)
982 stat
= svcauth_unix_set_client(rqstp
);
983 if (stat
== SVC_DROP
|| stat
== SVC_CLOSE
)
989 gss_write_init_verf(struct cache_detail
*cd
, struct svc_rqst
*rqstp
,
990 struct xdr_netobj
*out_handle
, int *major_status
)
995 if (*major_status
!= GSS_S_COMPLETE
)
996 return gss_write_null_verf(rqstp
);
997 rsci
= gss_svc_searchbyctx(cd
, out_handle
);
999 *major_status
= GSS_S_NO_CONTEXT
;
1000 return gss_write_null_verf(rqstp
);
1002 rc
= gss_write_verf(rqstp
, rsci
->mechctx
, GSS_SEQ_WIN
);
1003 cache_put(&rsci
->h
, cd
);
1008 gss_read_common_verf(struct rpc_gss_wire_cred
*gc
,
1009 struct kvec
*argv
, __be32
*authp
,
1010 struct xdr_netobj
*in_handle
)
1012 /* Read the verifier; should be NULL: */
1013 *authp
= rpc_autherr_badverf
;
1014 if (argv
->iov_len
< 2 * 4)
1016 if (svc_getnl(argv
) != RPC_AUTH_NULL
)
1018 if (svc_getnl(argv
) != 0)
1020 /* Martial context handle and token for upcall: */
1021 *authp
= rpc_autherr_badcred
;
1022 if (gc
->gc_proc
== RPC_GSS_PROC_INIT
&& gc
->gc_ctx
.len
!= 0)
1024 if (dup_netobj(in_handle
, &gc
->gc_ctx
))
1026 *authp
= rpc_autherr_badverf
;
1032 gss_read_verf(struct rpc_gss_wire_cred
*gc
,
1033 struct kvec
*argv
, __be32
*authp
,
1034 struct xdr_netobj
*in_handle
,
1035 struct xdr_netobj
*in_token
)
1037 struct xdr_netobj tmpobj
;
1040 res
= gss_read_common_verf(gc
, argv
, authp
, in_handle
);
1044 if (svc_safe_getnetobj(argv
, &tmpobj
)) {
1045 kfree(in_handle
->data
);
1048 if (dup_netobj(in_token
, &tmpobj
)) {
1049 kfree(in_handle
->data
);
1056 /* Ok this is really heavily depending on a set of semantics in
1057 * how rqstp is set up by svc_recv and pages laid down by the
1058 * server when reading a request. We are basically guaranteed that
1059 * the token lays all down linearly across a set of pages, starting
1060 * at iov_base in rq_arg.head[0] which happens to be the first of a
1061 * set of pages stored in rq_pages[].
1062 * rq_arg.head[0].iov_base will provide us the page_base to pass
1066 gss_read_proxy_verf(struct svc_rqst
*rqstp
,
1067 struct rpc_gss_wire_cred
*gc
, __be32
*authp
,
1068 struct xdr_netobj
*in_handle
,
1069 struct gssp_in_token
*in_token
)
1071 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1075 res
= gss_read_common_verf(gc
, argv
, authp
, in_handle
);
1079 inlen
= svc_getnl(argv
);
1080 if (inlen
> (argv
->iov_len
+ rqstp
->rq_arg
.page_len
))
1083 in_token
->pages
= rqstp
->rq_pages
;
1084 in_token
->page_base
= (ulong
)argv
->iov_base
& ~PAGE_MASK
;
1085 in_token
->page_len
= inlen
;
1091 gss_write_resv(struct kvec
*resv
, size_t size_limit
,
1092 struct xdr_netobj
*out_handle
, struct xdr_netobj
*out_token
,
1093 int major_status
, int minor_status
)
1095 if (resv
->iov_len
+ 4 > size_limit
)
1097 svc_putnl(resv
, RPC_SUCCESS
);
1098 if (svc_safe_putnetobj(resv
, out_handle
))
1100 if (resv
->iov_len
+ 3 * 4 > size_limit
)
1102 svc_putnl(resv
, major_status
);
1103 svc_putnl(resv
, minor_status
);
1104 svc_putnl(resv
, GSS_SEQ_WIN
);
1105 if (svc_safe_putnetobj(resv
, out_token
))
1111 * Having read the cred already and found we're in the context
1112 * initiation case, read the verifier and initiate (or check the results
1113 * of) upcalls to userspace for help with context initiation. If
1114 * the upcall results are available, write the verifier and result.
1115 * Otherwise, drop the request pending an answer to the upcall.
1117 static int svcauth_gss_legacy_init(struct svc_rqst
*rqstp
,
1118 struct rpc_gss_wire_cred
*gc
, __be32
*authp
)
1120 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1121 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1122 struct rsi
*rsip
, rsikey
;
1124 struct sunrpc_net
*sn
= net_generic(rqstp
->rq_xprt
->xpt_net
, sunrpc_net_id
);
1126 memset(&rsikey
, 0, sizeof(rsikey
));
1127 ret
= gss_read_verf(gc
, argv
, authp
,
1128 &rsikey
.in_handle
, &rsikey
.in_token
);
1132 /* Perform upcall, or find upcall result: */
1133 rsip
= rsi_lookup(sn
->rsi_cache
, &rsikey
);
1137 if (cache_check(sn
->rsi_cache
, &rsip
->h
, &rqstp
->rq_chandle
) < 0)
1138 /* No upcall result: */
1142 /* Got an answer to the upcall; use it: */
1143 if (gss_write_init_verf(sn
->rsc_cache
, rqstp
,
1144 &rsip
->out_handle
, &rsip
->major_status
))
1146 if (gss_write_resv(resv
, PAGE_SIZE
,
1147 &rsip
->out_handle
, &rsip
->out_token
,
1148 rsip
->major_status
, rsip
->minor_status
))
1153 cache_put(&rsip
->h
, sn
->rsi_cache
);
1157 static int gss_proxy_save_rsc(struct cache_detail
*cd
,
1158 struct gssp_upcall_data
*ud
,
1161 struct rsc rsci
, *rscp
= NULL
;
1162 static atomic64_t ctxhctr
;
1164 struct gss_api_mech
*gm
= NULL
;
1166 int status
= -EINVAL
;
1168 memset(&rsci
, 0, sizeof(rsci
));
1169 /* context handle */
1171 /* the handle needs to be just a unique id,
1172 * use a static counter */
1173 ctxh
= atomic64_inc_return(&ctxhctr
);
1175 /* make a copy for the caller */
1178 /* make a copy for the rsc cache */
1179 if (dup_to_netobj(&rsci
.handle
, (char *)handle
, sizeof(uint64_t)))
1181 rscp
= rsc_lookup(cd
, &rsci
);
1186 if (!ud
->found_creds
) {
1187 /* userspace seem buggy, we should always get at least a
1188 * mapping to nobody */
1189 dprintk("RPC: No creds found!\n");
1194 rsci
.cred
= ud
->creds
;
1195 memset(&ud
->creds
, 0, sizeof(struct svc_cred
));
1197 status
= -EOPNOTSUPP
;
1198 /* get mech handle from OID */
1199 gm
= gss_mech_get_by_OID(&ud
->mech_oid
);
1202 rsci
.cred
.cr_gss_mech
= gm
;
1205 /* mech-specific data: */
1206 status
= gss_import_sec_context(ud
->out_handle
.data
,
1209 &expiry
, GFP_KERNEL
);
1214 rsci
.h
.expiry_time
= expiry
;
1215 rscp
= rsc_update(cd
, &rsci
, rscp
);
1220 cache_put(&rscp
->h
, cd
);
1226 static int svcauth_gss_proxy_init(struct svc_rqst
*rqstp
,
1227 struct rpc_gss_wire_cred
*gc
, __be32
*authp
)
1229 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1230 struct xdr_netobj cli_handle
;
1231 struct gssp_upcall_data ud
;
1235 struct net
*net
= rqstp
->rq_xprt
->xpt_net
;
1236 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1238 memset(&ud
, 0, sizeof(ud
));
1239 ret
= gss_read_proxy_verf(rqstp
, gc
, authp
,
1240 &ud
.in_handle
, &ud
.in_token
);
1246 /* Perform synchronous upcall to gss-proxy */
1247 status
= gssp_accept_sec_context_upcall(net
, &ud
);
1251 dprintk("RPC: svcauth_gss: gss major status = %d "
1252 "minor status = %d\n",
1253 ud
.major_status
, ud
.minor_status
);
1255 switch (ud
.major_status
) {
1256 case GSS_S_CONTINUE_NEEDED
:
1257 cli_handle
= ud
.out_handle
;
1259 case GSS_S_COMPLETE
:
1260 status
= gss_proxy_save_rsc(sn
->rsc_cache
, &ud
, &handle
);
1263 cli_handle
.data
= (u8
*)&handle
;
1264 cli_handle
.len
= sizeof(handle
);
1271 /* Got an answer to the upcall; use it: */
1272 if (gss_write_init_verf(sn
->rsc_cache
, rqstp
,
1273 &cli_handle
, &ud
.major_status
))
1275 if (gss_write_resv(resv
, PAGE_SIZE
,
1276 &cli_handle
, &ud
.out_token
,
1277 ud
.major_status
, ud
.minor_status
))
1282 gssp_free_upcall_data(&ud
);
1287 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1288 * it to be changed if it's currently undefined (-1). If it's any other value
1289 * then return -EBUSY unless the type wouldn't have changed anyway.
1291 static int set_gss_proxy(struct net
*net
, int type
)
1293 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1296 WARN_ON_ONCE(type
!= 0 && type
!= 1);
1297 ret
= cmpxchg(&sn
->use_gss_proxy
, -1, type
);
1298 if (ret
!= -1 && ret
!= type
)
1303 static bool use_gss_proxy(struct net
*net
)
1305 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1307 /* If use_gss_proxy is still undefined, then try to disable it */
1308 if (sn
->use_gss_proxy
== -1)
1309 set_gss_proxy(net
, 0);
1310 return sn
->use_gss_proxy
;
1313 #ifdef CONFIG_PROC_FS
1315 static ssize_t
write_gssp(struct file
*file
, const char __user
*buf
,
1316 size_t count
, loff_t
*ppos
)
1318 struct net
*net
= PDE_DATA(file_inode(file
));
1323 if (*ppos
|| count
> sizeof(tbuf
)-1)
1325 if (copy_from_user(tbuf
, buf
, count
))
1329 res
= kstrtoul(tbuf
, 0, &i
);
1334 res
= set_gssp_clnt(net
);
1337 res
= set_gss_proxy(net
, 1);
1343 static ssize_t
read_gssp(struct file
*file
, char __user
*buf
,
1344 size_t count
, loff_t
*ppos
)
1346 struct net
*net
= PDE_DATA(file_inode(file
));
1347 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1348 unsigned long p
= *ppos
;
1352 snprintf(tbuf
, sizeof(tbuf
), "%d\n", sn
->use_gss_proxy
);
1359 if (copy_to_user(buf
, (void *)(tbuf
+p
), len
))
1365 static const struct file_operations use_gss_proxy_ops
= {
1366 .open
= nonseekable_open
,
1367 .write
= write_gssp
,
1371 static int create_use_gss_proxy_proc_entry(struct net
*net
)
1373 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1374 struct proc_dir_entry
**p
= &sn
->use_gssp_proc
;
1376 sn
->use_gss_proxy
= -1;
1377 *p
= proc_create_data("use-gss-proxy", S_IFREG
|S_IRUSR
|S_IWUSR
,
1379 &use_gss_proxy_ops
, net
);
1386 static void destroy_use_gss_proxy_proc_entry(struct net
*net
)
1388 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1390 if (sn
->use_gssp_proc
) {
1391 remove_proc_entry("use-gss-proxy", sn
->proc_net_rpc
);
1392 clear_gssp_clnt(sn
);
1395 #else /* CONFIG_PROC_FS */
1397 static int create_use_gss_proxy_proc_entry(struct net
*net
)
1402 static void destroy_use_gss_proxy_proc_entry(struct net
*net
) {}
1404 #endif /* CONFIG_PROC_FS */
1407 * Accept an rpcsec packet.
1408 * If context establishment, punt to user space
1409 * If data exchange, verify/decrypt
1410 * If context destruction, handle here
1411 * In the context establishment and destruction case we encode
1412 * response here and return SVC_COMPLETE.
1415 svcauth_gss_accept(struct svc_rqst
*rqstp
, __be32
*authp
)
1417 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
1418 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
1420 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
1421 struct rpc_gss_wire_cred
*gc
;
1422 struct rsc
*rsci
= NULL
;
1424 __be32
*reject_stat
= resv
->iov_base
+ resv
->iov_len
;
1426 struct sunrpc_net
*sn
= net_generic(rqstp
->rq_xprt
->xpt_net
, sunrpc_net_id
);
1428 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",
1431 *authp
= rpc_autherr_badcred
;
1433 svcdata
= kmalloc(sizeof(*svcdata
), GFP_KERNEL
);
1436 rqstp
->rq_auth_data
= svcdata
;
1437 svcdata
->verf_start
= NULL
;
1438 svcdata
->rsci
= NULL
;
1439 gc
= &svcdata
->clcred
;
1441 /* start of rpc packet is 7 u32's back from here:
1442 * xid direction rpcversion prog vers proc flavour
1444 rpcstart
= argv
->iov_base
;
1448 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1449 * at least 5 u32s, and is preceded by length, so that makes 6.
1452 if (argv
->iov_len
< 5 * 4)
1454 crlen
= svc_getnl(argv
);
1455 if (svc_getnl(argv
) != RPC_GSS_VERSION
)
1457 gc
->gc_proc
= svc_getnl(argv
);
1458 gc
->gc_seq
= svc_getnl(argv
);
1459 gc
->gc_svc
= svc_getnl(argv
);
1460 if (svc_safe_getnetobj(argv
, &gc
->gc_ctx
))
1462 if (crlen
!= round_up_to_quad(gc
->gc_ctx
.len
) + 5 * 4)
1465 if ((gc
->gc_proc
!= RPC_GSS_PROC_DATA
) && (rqstp
->rq_proc
!= 0))
1468 *authp
= rpc_autherr_badverf
;
1469 switch (gc
->gc_proc
) {
1470 case RPC_GSS_PROC_INIT
:
1471 case RPC_GSS_PROC_CONTINUE_INIT
:
1472 if (use_gss_proxy(SVC_NET(rqstp
)))
1473 return svcauth_gss_proxy_init(rqstp
, gc
, authp
);
1475 return svcauth_gss_legacy_init(rqstp
, gc
, authp
);
1476 case RPC_GSS_PROC_DATA
:
1477 case RPC_GSS_PROC_DESTROY
:
1478 /* Look up the context, and check the verifier: */
1479 *authp
= rpcsec_gsserr_credproblem
;
1480 rsci
= gss_svc_searchbyctx(sn
->rsc_cache
, &gc
->gc_ctx
);
1483 switch (gss_verify_header(rqstp
, rsci
, rpcstart
, gc
, authp
)) {
1493 *authp
= rpc_autherr_rejectedcred
;
1497 /* now act upon the command: */
1498 switch (gc
->gc_proc
) {
1499 case RPC_GSS_PROC_DESTROY
:
1500 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1502 /* Delete the entry from the cache_list and call cache_put */
1503 sunrpc_cache_unhash(sn
->rsc_cache
, &rsci
->h
);
1504 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1506 svc_putnl(resv
, RPC_SUCCESS
);
1508 case RPC_GSS_PROC_DATA
:
1509 *authp
= rpcsec_gsserr_ctxproblem
;
1510 svcdata
->verf_start
= resv
->iov_base
+ resv
->iov_len
;
1511 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1513 rqstp
->rq_cred
= rsci
->cred
;
1514 get_group_info(rsci
->cred
.cr_group_info
);
1515 *authp
= rpc_autherr_badcred
;
1516 switch (gc
->gc_svc
) {
1517 case RPC_GSS_SVC_NONE
:
1519 case RPC_GSS_SVC_INTEGRITY
:
1520 /* placeholders for length and seq. number: */
1523 if (unwrap_integ_data(rqstp
, &rqstp
->rq_arg
,
1524 gc
->gc_seq
, rsci
->mechctx
))
1526 rqstp
->rq_auth_slack
= RPC_MAX_AUTH_SIZE
;
1528 case RPC_GSS_SVC_PRIVACY
:
1529 /* placeholders for length and seq. number: */
1532 if (unwrap_priv_data(rqstp
, &rqstp
->rq_arg
,
1533 gc
->gc_seq
, rsci
->mechctx
))
1535 rqstp
->rq_auth_slack
= RPC_MAX_AUTH_SIZE
* 2;
1540 svcdata
->rsci
= rsci
;
1541 cache_get(&rsci
->h
);
1542 rqstp
->rq_cred
.cr_flavor
= gss_svc_to_pseudoflavor(
1543 rsci
->mechctx
->mech_type
,
1553 /* Restore write pointer to its original value: */
1554 xdr_ressize_check(rqstp
, reject_stat
);
1564 cache_put(&rsci
->h
, sn
->rsc_cache
);
1569 svcauth_gss_prepare_to_wrap(struct xdr_buf
*resbuf
, struct gss_svc_data
*gsd
)
1574 p
= gsd
->verf_start
;
1575 gsd
->verf_start
= NULL
;
1577 /* If the reply stat is nonzero, don't wrap: */
1578 if (*(p
-1) != rpc_success
)
1580 /* Skip the verifier: */
1582 verf_len
= ntohl(*p
++);
1583 p
+= XDR_QUADLEN(verf_len
);
1584 /* move accept_stat to right place: */
1585 memcpy(p
, p
+ 2, 4);
1586 /* Also don't wrap if the accept stat is nonzero: */
1587 if (*p
!= rpc_success
) {
1588 resbuf
->head
[0].iov_len
-= 2 * 4;
1596 svcauth_gss_wrap_resp_integ(struct svc_rqst
*rqstp
)
1598 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1599 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1600 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1601 struct xdr_buf integ_buf
;
1602 struct xdr_netobj mic
;
1605 int integ_offset
, integ_len
;
1608 p
= svcauth_gss_prepare_to_wrap(resbuf
, gsd
);
1611 integ_offset
= (u8
*)(p
+ 1) - (u8
*)resbuf
->head
[0].iov_base
;
1612 integ_len
= resbuf
->len
- integ_offset
;
1613 BUG_ON(integ_len
% 4);
1614 *p
++ = htonl(integ_len
);
1615 *p
++ = htonl(gc
->gc_seq
);
1616 if (xdr_buf_subsegment(resbuf
, &integ_buf
, integ_offset
, integ_len
)) {
1620 if (resbuf
->tail
[0].iov_base
== NULL
) {
1621 if (resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1623 resbuf
->tail
[0].iov_base
= resbuf
->head
[0].iov_base
1624 + resbuf
->head
[0].iov_len
;
1625 resbuf
->tail
[0].iov_len
= 0;
1627 resv
= &resbuf
->tail
[0];
1628 mic
.data
= (u8
*)resv
->iov_base
+ resv
->iov_len
+ 4;
1629 if (gss_get_mic(gsd
->rsci
->mechctx
, &integ_buf
, &mic
))
1631 svc_putnl(resv
, mic
.len
);
1632 memset(mic
.data
+ mic
.len
, 0,
1633 round_up_to_quad(mic
.len
) - mic
.len
);
1634 resv
->iov_len
+= XDR_QUADLEN(mic
.len
) << 2;
1635 /* not strictly required: */
1636 resbuf
->len
+= XDR_QUADLEN(mic
.len
) << 2;
1637 BUG_ON(resv
->iov_len
> PAGE_SIZE
);
1645 svcauth_gss_wrap_resp_priv(struct svc_rqst
*rqstp
)
1647 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1648 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1649 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1650 struct page
**inpages
= NULL
;
1655 p
= svcauth_gss_prepare_to_wrap(resbuf
, gsd
);
1659 offset
= (u8
*)p
- (u8
*)resbuf
->head
[0].iov_base
;
1660 *p
++ = htonl(gc
->gc_seq
);
1661 inpages
= resbuf
->pages
;
1662 /* XXX: Would be better to write some xdr helper functions for
1663 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1666 * If there is currently tail data, make sure there is
1667 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1668 * the page, and move the current tail data such that
1669 * there is RPC_MAX_AUTH_SIZE slack space available in
1670 * both the head and tail.
1672 if (resbuf
->tail
[0].iov_base
) {
1673 BUG_ON(resbuf
->tail
[0].iov_base
>= resbuf
->head
[0].iov_base
1675 BUG_ON(resbuf
->tail
[0].iov_base
< resbuf
->head
[0].iov_base
);
1676 if (resbuf
->tail
[0].iov_len
+ resbuf
->head
[0].iov_len
1677 + 2 * RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1679 memmove(resbuf
->tail
[0].iov_base
+ RPC_MAX_AUTH_SIZE
,
1680 resbuf
->tail
[0].iov_base
,
1681 resbuf
->tail
[0].iov_len
);
1682 resbuf
->tail
[0].iov_base
+= RPC_MAX_AUTH_SIZE
;
1685 * If there is no current tail data, make sure there is
1686 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1687 * allotted page, and set up tail information such that there
1688 * is RPC_MAX_AUTH_SIZE slack space available in both the
1691 if (resbuf
->tail
[0].iov_base
== NULL
) {
1692 if (resbuf
->head
[0].iov_len
+ 2*RPC_MAX_AUTH_SIZE
> PAGE_SIZE
)
1694 resbuf
->tail
[0].iov_base
= resbuf
->head
[0].iov_base
1695 + resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
;
1696 resbuf
->tail
[0].iov_len
= 0;
1698 if (gss_wrap(gsd
->rsci
->mechctx
, offset
, resbuf
, inpages
))
1700 *len
= htonl(resbuf
->len
- offset
);
1701 pad
= 3 - ((resbuf
->len
- offset
- 1)&3);
1702 p
= (__be32
*)(resbuf
->tail
[0].iov_base
+ resbuf
->tail
[0].iov_len
);
1704 resbuf
->tail
[0].iov_len
+= pad
;
1710 svcauth_gss_release(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
;
1716 struct sunrpc_net
*sn
= net_generic(rqstp
->rq_xprt
->xpt_net
, sunrpc_net_id
);
1718 if (gc
->gc_proc
!= RPC_GSS_PROC_DATA
)
1720 /* Release can be called twice, but we only wrap once. */
1721 if (gsd
->verf_start
== NULL
)
1723 /* normally not set till svc_send, but we need it here: */
1724 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1726 resbuf
->len
= total_buf_len(resbuf
);
1727 switch (gc
->gc_svc
) {
1728 case RPC_GSS_SVC_NONE
:
1730 case RPC_GSS_SVC_INTEGRITY
:
1731 stat
= svcauth_gss_wrap_resp_integ(rqstp
);
1735 case RPC_GSS_SVC_PRIVACY
:
1736 stat
= svcauth_gss_wrap_resp_priv(rqstp
);
1741 * For any other gc_svc value, svcauth_gss_accept() already set
1742 * the auth_error appropriately; just fall through:
1749 if (rqstp
->rq_client
)
1750 auth_domain_put(rqstp
->rq_client
);
1751 rqstp
->rq_client
= NULL
;
1752 if (rqstp
->rq_gssclient
)
1753 auth_domain_put(rqstp
->rq_gssclient
);
1754 rqstp
->rq_gssclient
= NULL
;
1755 if (rqstp
->rq_cred
.cr_group_info
)
1756 put_group_info(rqstp
->rq_cred
.cr_group_info
);
1757 rqstp
->rq_cred
.cr_group_info
= NULL
;
1759 cache_put(&gsd
->rsci
->h
, sn
->rsc_cache
);
1766 svcauth_gss_domain_release(struct auth_domain
*dom
)
1768 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
1774 static struct auth_ops svcauthops_gss
= {
1775 .name
= "rpcsec_gss",
1776 .owner
= THIS_MODULE
,
1777 .flavour
= RPC_AUTH_GSS
,
1778 .accept
= svcauth_gss_accept
,
1779 .release
= svcauth_gss_release
,
1780 .domain_release
= svcauth_gss_domain_release
,
1781 .set_client
= svcauth_gss_set_client
,
1784 static int rsi_cache_create_net(struct net
*net
)
1786 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1787 struct cache_detail
*cd
;
1790 cd
= cache_create_net(&rsi_cache_template
, net
);
1793 err
= cache_register_net(cd
, net
);
1795 cache_destroy_net(cd
, net
);
1802 static void rsi_cache_destroy_net(struct net
*net
)
1804 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1805 struct cache_detail
*cd
= sn
->rsi_cache
;
1807 sn
->rsi_cache
= NULL
;
1809 cache_unregister_net(cd
, net
);
1810 cache_destroy_net(cd
, net
);
1813 static int rsc_cache_create_net(struct net
*net
)
1815 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1816 struct cache_detail
*cd
;
1819 cd
= cache_create_net(&rsc_cache_template
, net
);
1822 err
= cache_register_net(cd
, net
);
1824 cache_destroy_net(cd
, net
);
1831 static void rsc_cache_destroy_net(struct net
*net
)
1833 struct sunrpc_net
*sn
= net_generic(net
, sunrpc_net_id
);
1834 struct cache_detail
*cd
= sn
->rsc_cache
;
1836 sn
->rsc_cache
= NULL
;
1838 cache_unregister_net(cd
, net
);
1839 cache_destroy_net(cd
, net
);
1843 gss_svc_init_net(struct net
*net
)
1847 rv
= rsc_cache_create_net(net
);
1850 rv
= rsi_cache_create_net(net
);
1853 rv
= create_use_gss_proxy_proc_entry(net
);
1858 destroy_use_gss_proxy_proc_entry(net
);
1860 rsc_cache_destroy_net(net
);
1865 gss_svc_shutdown_net(struct net
*net
)
1867 destroy_use_gss_proxy_proc_entry(net
);
1868 rsi_cache_destroy_net(net
);
1869 rsc_cache_destroy_net(net
);
1875 return svc_auth_register(RPC_AUTH_GSS
, &svcauthops_gss
);
1879 gss_svc_shutdown(void)
1881 svc_auth_unregister(RPC_AUTH_GSS
);