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/types.h>
41 #include <linux/module.h>
42 #include <linux/pagemap.h>
44 #include <linux/sunrpc/auth_gss.h>
45 #include <linux/sunrpc/svcauth.h>
46 #include <linux/sunrpc/gss_err.h>
47 #include <linux/sunrpc/svcauth.h>
48 #include <linux/sunrpc/svcauth_gss.h>
49 #include <linux/sunrpc/cache.h>
52 # define RPCDBG_FACILITY RPCDBG_AUTH
55 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
58 * Key is context handle (\x if empty) and gss_token.
59 * Content is major_status minor_status (integers) context_handle, reply_token.
63 static int netobj_equal(struct xdr_netobj
*a
, struct xdr_netobj
*b
)
65 return a
->len
== b
->len
&& 0 == memcmp(a
->data
, b
->data
, a
->len
);
68 #define RSI_HASHBITS 6
69 #define RSI_HASHMAX (1<<RSI_HASHBITS)
70 #define RSI_HASHMASK (RSI_HASHMAX-1)
74 struct xdr_netobj in_handle
, in_token
;
75 struct xdr_netobj out_handle
, out_token
;
76 int major_status
, minor_status
;
79 static struct cache_head
*rsi_table
[RSI_HASHMAX
];
80 static struct cache_detail rsi_cache
;
81 static struct rsi
*rsi_update(struct rsi
*new, struct rsi
*old
);
82 static struct rsi
*rsi_lookup(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
? kmalloc(len
, GFP_KERNEL
) : NULL
);
118 memcpy(dst
->data
, src
, len
);
119 if (len
&& !dst
->data
)
124 static inline int dup_netobj(struct xdr_netobj
*dst
, struct xdr_netobj
*src
)
126 return dup_to_netobj(dst
, src
->data
, src
->len
);
129 static void rsi_init(struct cache_head
*cnew
, struct cache_head
*citem
)
131 struct rsi
*new = container_of(cnew
, struct rsi
, h
);
132 struct rsi
*item
= container_of(citem
, struct rsi
, h
);
134 new->out_handle
.data
= NULL
;
135 new->out_handle
.len
= 0;
136 new->out_token
.data
= NULL
;
137 new->out_token
.len
= 0;
138 new->in_handle
.len
= item
->in_handle
.len
;
139 item
->in_handle
.len
= 0;
140 new->in_token
.len
= item
->in_token
.len
;
141 item
->in_token
.len
= 0;
142 new->in_handle
.data
= item
->in_handle
.data
;
143 item
->in_handle
.data
= NULL
;
144 new->in_token
.data
= item
->in_token
.data
;
145 item
->in_token
.data
= NULL
;
148 static void update_rsi(struct cache_head
*cnew
, struct cache_head
*citem
)
150 struct rsi
*new = container_of(cnew
, struct rsi
, h
);
151 struct rsi
*item
= container_of(citem
, struct rsi
, h
);
153 BUG_ON(new->out_handle
.data
|| new->out_token
.data
);
154 new->out_handle
.len
= item
->out_handle
.len
;
155 item
->out_handle
.len
= 0;
156 new->out_token
.len
= item
->out_token
.len
;
157 item
->out_token
.len
= 0;
158 new->out_handle
.data
= item
->out_handle
.data
;
159 item
->out_handle
.data
= NULL
;
160 new->out_token
.data
= item
->out_token
.data
;
161 item
->out_token
.data
= NULL
;
163 new->major_status
= item
->major_status
;
164 new->minor_status
= item
->minor_status
;
167 static struct cache_head
*rsi_alloc(void)
169 struct rsi
*rsii
= kmalloc(sizeof(*rsii
), GFP_KERNEL
);
176 static void rsi_request(struct cache_detail
*cd
,
177 struct cache_head
*h
,
178 char **bpp
, int *blen
)
180 struct rsi
*rsii
= container_of(h
, struct rsi
, h
);
182 qword_addhex(bpp
, blen
, rsii
->in_handle
.data
, rsii
->in_handle
.len
);
183 qword_addhex(bpp
, blen
, rsii
->in_token
.data
, rsii
->in_token
.len
);
188 static int rsi_parse(struct cache_detail
*cd
,
189 char *mesg
, int mlen
)
191 /* context token expiry major minor context token */
195 struct rsi rsii
, *rsip
= NULL
;
197 int status
= -EINVAL
;
199 memset(&rsii
, 0, sizeof(rsii
));
201 len
= qword_get(&mesg
, buf
, mlen
);
205 if (dup_to_netobj(&rsii
.in_handle
, buf
, len
))
209 len
= qword_get(&mesg
, buf
, mlen
);
214 if (dup_to_netobj(&rsii
.in_token
, buf
, len
))
217 rsip
= rsi_lookup(&rsii
);
223 expiry
= get_expiry(&mesg
);
229 len
= qword_get(&mesg
, buf
, mlen
);
235 rsii
.major_status
= simple_strtoul(buf
, &ep
, 10);
238 len
= qword_get(&mesg
, buf
, mlen
);
241 rsii
.minor_status
= simple_strtoul(buf
, &ep
, 10);
246 len
= qword_get(&mesg
, buf
, mlen
);
250 if (dup_to_netobj(&rsii
.out_handle
, buf
, len
))
254 len
= qword_get(&mesg
, buf
, mlen
);
259 if (dup_to_netobj(&rsii
.out_token
, buf
, len
))
262 rsii
.h
.expiry_time
= expiry
;
263 rsip
= rsi_update(&rsii
, rsip
);
268 cache_put(&rsip
->h
, &rsi_cache
);
274 static struct cache_detail rsi_cache
= {
275 .owner
= THIS_MODULE
,
276 .hash_size
= RSI_HASHMAX
,
277 .hash_table
= rsi_table
,
278 .name
= "auth.rpcsec.init",
279 .cache_put
= rsi_put
,
280 .cache_request
= rsi_request
,
281 .cache_parse
= rsi_parse
,
284 .update
= update_rsi
,
288 static struct rsi
*rsi_lookup(struct rsi
*item
)
290 struct cache_head
*ch
;
291 int hash
= rsi_hash(item
);
293 ch
= sunrpc_cache_lookup(&rsi_cache
, &item
->h
, hash
);
295 return container_of(ch
, struct rsi
, h
);
300 static struct rsi
*rsi_update(struct rsi
*new, struct rsi
*old
)
302 struct cache_head
*ch
;
303 int hash
= rsi_hash(new);
305 ch
= sunrpc_cache_update(&rsi_cache
, &new->h
,
308 return container_of(ch
, struct rsi
, h
);
315 * The rpcsec_context cache is used to store a context that is
316 * used in data exchange.
317 * The key is a context handle. The content is:
318 * uid, gidlist, mechanism, service-set, mech-specific-data
321 #define RSC_HASHBITS 10
322 #define RSC_HASHMAX (1<<RSC_HASHBITS)
323 #define RSC_HASHMASK (RSC_HASHMAX-1)
325 #define GSS_SEQ_WIN 128
327 struct gss_svc_seq_data
{
328 /* highest seq number seen so far: */
330 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
331 * sd_win is nonzero iff sequence number i has been seen already: */
332 unsigned long sd_win
[GSS_SEQ_WIN
/BITS_PER_LONG
];
338 struct xdr_netobj handle
;
339 struct svc_cred cred
;
340 struct gss_svc_seq_data seqdata
;
341 struct gss_ctx
*mechctx
;
344 static struct cache_head
*rsc_table
[RSC_HASHMAX
];
345 static struct cache_detail rsc_cache
;
346 static struct rsc
*rsc_update(struct rsc
*new, struct rsc
*old
);
347 static struct rsc
*rsc_lookup(struct rsc
*item
);
349 static void rsc_free(struct rsc
*rsci
)
351 kfree(rsci
->handle
.data
);
353 gss_delete_sec_context(&rsci
->mechctx
);
354 if (rsci
->cred
.cr_group_info
)
355 put_group_info(rsci
->cred
.cr_group_info
);
358 static void rsc_put(struct kref
*ref
)
360 struct rsc
*rsci
= container_of(ref
, struct rsc
, h
.ref
);
367 rsc_hash(struct rsc
*rsci
)
369 return hash_mem(rsci
->handle
.data
, rsci
->handle
.len
, RSC_HASHBITS
);
373 rsc_match(struct cache_head
*a
, struct cache_head
*b
)
375 struct rsc
*new = container_of(a
, struct rsc
, h
);
376 struct rsc
*tmp
= container_of(b
, struct rsc
, h
);
378 return netobj_equal(&new->handle
, &tmp
->handle
);
382 rsc_init(struct cache_head
*cnew
, struct cache_head
*ctmp
)
384 struct rsc
*new = container_of(cnew
, struct rsc
, h
);
385 struct rsc
*tmp
= container_of(ctmp
, struct rsc
, h
);
387 new->handle
.len
= tmp
->handle
.len
;
389 new->handle
.data
= tmp
->handle
.data
;
390 tmp
->handle
.data
= NULL
;
392 new->cred
.cr_group_info
= NULL
;
396 update_rsc(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->mechctx
= tmp
->mechctx
;
403 memset(&new->seqdata
, 0, sizeof(new->seqdata
));
404 spin_lock_init(&new->seqdata
.sd_lock
);
405 new->cred
= tmp
->cred
;
406 tmp
->cred
.cr_group_info
= NULL
;
409 static struct cache_head
*
412 struct rsc
*rsci
= kmalloc(sizeof(*rsci
), GFP_KERNEL
);
419 static int rsc_parse(struct cache_detail
*cd
,
420 char *mesg
, int mlen
)
422 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
425 struct rsc rsci
, *rscp
= NULL
;
427 int status
= -EINVAL
;
428 struct gss_api_mech
*gm
= NULL
;
430 memset(&rsci
, 0, sizeof(rsci
));
432 len
= qword_get(&mesg
, buf
, mlen
);
433 if (len
< 0) goto out
;
435 if (dup_to_netobj(&rsci
.handle
, buf
, len
))
440 expiry
= get_expiry(&mesg
);
445 rscp
= rsc_lookup(&rsci
);
449 /* uid, or NEGATIVE */
450 rv
= get_int(&mesg
, &rsci
.cred
.cr_uid
);
454 set_bit(CACHE_NEGATIVE
, &rsci
.h
.flags
);
459 if (get_int(&mesg
, &rsci
.cred
.cr_gid
))
462 /* number of additional gid's */
463 if (get_int(&mesg
, &N
))
466 rsci
.cred
.cr_group_info
= groups_alloc(N
);
467 if (rsci
.cred
.cr_group_info
== NULL
)
472 for (i
=0; i
<N
; i
++) {
474 if (get_int(&mesg
, &gid
))
476 GROUP_AT(rsci
.cred
.cr_group_info
, i
) = gid
;
480 len
= qword_get(&mesg
, buf
, mlen
);
483 gm
= gss_mech_get_by_name(buf
);
484 status
= -EOPNOTSUPP
;
489 /* mech-specific data: */
490 len
= qword_get(&mesg
, buf
, mlen
);
493 status
= gss_import_sec_context(buf
, len
, gm
, &rsci
.mechctx
);
497 rsci
.h
.expiry_time
= expiry
;
498 rscp
= rsc_update(&rsci
, rscp
);
504 cache_put(&rscp
->h
, &rsc_cache
);
510 static struct cache_detail rsc_cache
= {
511 .owner
= THIS_MODULE
,
512 .hash_size
= RSC_HASHMAX
,
513 .hash_table
= rsc_table
,
514 .name
= "auth.rpcsec.context",
515 .cache_put
= rsc_put
,
516 .cache_parse
= rsc_parse
,
519 .update
= update_rsc
,
523 static struct rsc
*rsc_lookup(struct rsc
*item
)
525 struct cache_head
*ch
;
526 int hash
= rsc_hash(item
);
528 ch
= sunrpc_cache_lookup(&rsc_cache
, &item
->h
, hash
);
530 return container_of(ch
, struct rsc
, h
);
535 static struct rsc
*rsc_update(struct rsc
*new, struct rsc
*old
)
537 struct cache_head
*ch
;
538 int hash
= rsc_hash(new);
540 ch
= sunrpc_cache_update(&rsc_cache
, &new->h
,
543 return container_of(ch
, struct rsc
, h
);
550 gss_svc_searchbyctx(struct xdr_netobj
*handle
)
555 memset(&rsci
, 0, sizeof(rsci
));
556 if (dup_to_netobj(&rsci
.handle
, handle
->data
, handle
->len
))
558 found
= rsc_lookup(&rsci
);
562 if (cache_check(&rsc_cache
, &found
->h
, NULL
))
567 /* Implements sequence number algorithm as specified in RFC 2203. */
569 gss_check_seq_num(struct rsc
*rsci
, int seq_num
)
571 struct gss_svc_seq_data
*sd
= &rsci
->seqdata
;
573 spin_lock(&sd
->sd_lock
);
574 if (seq_num
> sd
->sd_max
) {
575 if (seq_num
>= sd
->sd_max
+ GSS_SEQ_WIN
) {
576 memset(sd
->sd_win
,0,sizeof(sd
->sd_win
));
577 sd
->sd_max
= seq_num
;
578 } else while (sd
->sd_max
< seq_num
) {
580 __clear_bit(sd
->sd_max
% GSS_SEQ_WIN
, sd
->sd_win
);
582 __set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
);
584 } else if (seq_num
<= sd
->sd_max
- GSS_SEQ_WIN
) {
587 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
588 if (__test_and_set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
))
591 spin_unlock(&sd
->sd_lock
);
594 spin_unlock(&sd
->sd_lock
);
598 static inline u32
round_up_to_quad(u32 i
)
600 return (i
+ 3 ) & ~3;
604 svc_safe_getnetobj(struct kvec
*argv
, struct xdr_netobj
*o
)
608 if (argv
->iov_len
< 4)
610 o
->len
= ntohl(svc_getu32(argv
));
611 l
= round_up_to_quad(o
->len
);
612 if (argv
->iov_len
< l
)
614 o
->data
= argv
->iov_base
;
621 svc_safe_putnetobj(struct kvec
*resv
, struct xdr_netobj
*o
)
625 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
627 svc_putu32(resv
, htonl(o
->len
));
628 p
= resv
->iov_base
+ resv
->iov_len
;
629 resv
->iov_len
+= round_up_to_quad(o
->len
);
630 if (resv
->iov_len
> PAGE_SIZE
)
632 memcpy(p
, o
->data
, o
->len
);
633 memset((u8
*)p
+ o
->len
, 0, round_up_to_quad(o
->len
) - o
->len
);
637 /* Verify the checksum on the header and return SVC_OK on success.
638 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
639 * or return SVC_DENIED and indicate error in authp.
642 gss_verify_header(struct svc_rqst
*rqstp
, struct rsc
*rsci
,
643 u32
*rpcstart
, struct rpc_gss_wire_cred
*gc
, u32
*authp
)
645 struct gss_ctx
*ctx_id
= rsci
->mechctx
;
646 struct xdr_buf rpchdr
;
647 struct xdr_netobj checksum
;
649 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
652 /* data to compute the checksum over: */
653 iov
.iov_base
= rpcstart
;
654 iov
.iov_len
= (u8
*)argv
->iov_base
- (u8
*)rpcstart
;
655 xdr_buf_from_iov(&iov
, &rpchdr
);
657 *authp
= rpc_autherr_badverf
;
658 if (argv
->iov_len
< 4)
660 flavor
= ntohl(svc_getu32(argv
));
661 if (flavor
!= RPC_AUTH_GSS
)
663 if (svc_safe_getnetobj(argv
, &checksum
))
666 if (rqstp
->rq_deferred
) /* skip verification of revisited request */
668 if (gss_verify_mic(ctx_id
, &rpchdr
, &checksum
) != GSS_S_COMPLETE
) {
669 *authp
= rpcsec_gsserr_credproblem
;
673 if (gc
->gc_seq
> MAXSEQ
) {
674 dprintk("RPC: svcauth_gss: discarding request with large sequence number %d\n",
676 *authp
= rpcsec_gsserr_ctxproblem
;
679 if (!gss_check_seq_num(rsci
, gc
->gc_seq
)) {
680 dprintk("RPC: svcauth_gss: discarding request with old sequence number %d\n",
688 gss_write_null_verf(struct svc_rqst
*rqstp
)
692 svc_putu32(rqstp
->rq_res
.head
, htonl(RPC_AUTH_NULL
));
693 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
694 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
696 if (!xdr_ressize_check(rqstp
, p
))
702 gss_write_verf(struct svc_rqst
*rqstp
, struct gss_ctx
*ctx_id
, u32 seq
)
706 struct xdr_buf verf_data
;
707 struct xdr_netobj mic
;
711 svc_putu32(rqstp
->rq_res
.head
, htonl(RPC_AUTH_GSS
));
712 xdr_seq
= htonl(seq
);
714 iov
.iov_base
= &xdr_seq
;
715 iov
.iov_len
= sizeof(xdr_seq
);
716 xdr_buf_from_iov(&iov
, &verf_data
);
717 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
718 mic
.data
= (u8
*)(p
+ 1);
719 maj_stat
= gss_get_mic(ctx_id
, &verf_data
, &mic
);
720 if (maj_stat
!= GSS_S_COMPLETE
)
722 *p
++ = htonl(mic
.len
);
723 memset((u8
*)p
+ mic
.len
, 0, round_up_to_quad(mic
.len
) - mic
.len
);
724 p
+= XDR_QUADLEN(mic
.len
);
725 if (!xdr_ressize_check(rqstp
, p
))
731 struct auth_domain h
;
735 static struct auth_domain
*
736 find_gss_auth_domain(struct gss_ctx
*ctx
, u32 svc
)
740 name
= gss_service_to_auth_domain_name(ctx
->mech_type
, svc
);
743 return auth_domain_find(name
);
746 static struct auth_ops svcauthops_gss
;
749 svcauth_gss_register_pseudoflavor(u32 pseudoflavor
, char * name
)
751 struct gss_domain
*new;
752 struct auth_domain
*test
;
755 new = kmalloc(sizeof(*new), GFP_KERNEL
);
758 kref_init(&new->h
.ref
);
759 new->h
.name
= kmalloc(strlen(name
) + 1, GFP_KERNEL
);
762 strcpy(new->h
.name
, name
);
763 new->h
.flavour
= &svcauthops_gss
;
764 new->pseudoflavor
= pseudoflavor
;
766 test
= auth_domain_lookup(name
, &new->h
);
767 if (test
!= &new->h
) { /* XXX Duplicate registration? */
768 auth_domain_put(&new->h
);
769 /* dangling ref-count... */
780 EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor
);
783 read_u32_from_xdr_buf(struct xdr_buf
*buf
, int base
, u32
*obj
)
788 status
= read_bytes_from_xdr_buf(buf
, base
, &raw
, sizeof(*obj
));
795 /* It would be nice if this bit of code could be shared with the client.
797 * The client shouldn't malloc(), would have to pass in own memory.
798 * The server uses base of head iovec as read pointer, while the
799 * client uses separate pointer. */
801 unwrap_integ_data(struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
804 u32 integ_len
, maj_stat
;
805 struct xdr_netobj mic
;
806 struct xdr_buf integ_buf
;
808 integ_len
= ntohl(svc_getu32(&buf
->head
[0]));
811 if (integ_len
> buf
->len
)
813 if (xdr_buf_subsegment(buf
, &integ_buf
, 0, integ_len
))
815 /* copy out mic... */
816 if (read_u32_from_xdr_buf(buf
, integ_len
, &mic
.len
))
818 if (mic
.len
> RPC_MAX_AUTH_SIZE
)
820 mic
.data
= kmalloc(mic
.len
, GFP_KERNEL
);
823 if (read_bytes_from_xdr_buf(buf
, integ_len
+ 4, mic
.data
, mic
.len
))
825 maj_stat
= gss_verify_mic(ctx
, &integ_buf
, &mic
);
826 if (maj_stat
!= GSS_S_COMPLETE
)
828 if (ntohl(svc_getu32(&buf
->head
[0])) != seq
)
835 struct gss_svc_data
{
836 /* decoded gss client cred: */
837 struct rpc_gss_wire_cred clcred
;
838 /* pointer to the beginning of the procedure-specific results,
839 * which may be encrypted/checksummed in svcauth_gss_release: */
845 svcauth_gss_set_client(struct svc_rqst
*rqstp
)
847 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
848 struct rsc
*rsci
= svcdata
->rsci
;
849 struct rpc_gss_wire_cred
*gc
= &svcdata
->clcred
;
851 rqstp
->rq_client
= find_gss_auth_domain(rsci
->mechctx
, gc
->gc_svc
);
852 if (rqstp
->rq_client
== NULL
)
858 gss_write_init_verf(struct svc_rqst
*rqstp
, struct rsi
*rsip
)
862 if (rsip
->major_status
!= GSS_S_COMPLETE
)
863 return gss_write_null_verf(rqstp
);
864 rsci
= gss_svc_searchbyctx(&rsip
->out_handle
);
866 rsip
->major_status
= GSS_S_NO_CONTEXT
;
867 return gss_write_null_verf(rqstp
);
869 return gss_write_verf(rqstp
, rsci
->mechctx
, GSS_SEQ_WIN
);
873 * Accept an rpcsec packet.
874 * If context establishment, punt to user space
875 * If data exchange, verify/decrypt
876 * If context destruction, handle here
877 * In the context establishment and destruction case we encode
878 * response here and return SVC_COMPLETE.
881 svcauth_gss_accept(struct svc_rqst
*rqstp
, u32
*authp
)
883 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
884 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
886 struct xdr_netobj tmpobj
;
887 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
888 struct rpc_gss_wire_cred
*gc
;
889 struct rsc
*rsci
= NULL
;
890 struct rsi
*rsip
, rsikey
;
892 u32
*reject_stat
= resv
->iov_base
+ resv
->iov_len
;
895 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",argv
->iov_len
);
897 *authp
= rpc_autherr_badcred
;
899 svcdata
= kmalloc(sizeof(*svcdata
), GFP_KERNEL
);
902 rqstp
->rq_auth_data
= svcdata
;
903 svcdata
->body_start
= NULL
;
904 svcdata
->rsci
= NULL
;
905 gc
= &svcdata
->clcred
;
907 /* start of rpc packet is 7 u32's back from here:
908 * xid direction rpcversion prog vers proc flavour
910 rpcstart
= argv
->iov_base
;
914 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
915 * at least 5 u32s, and is preceeded by length, so that makes 6.
918 if (argv
->iov_len
< 5 * 4)
920 crlen
= ntohl(svc_getu32(argv
));
921 if (ntohl(svc_getu32(argv
)) != RPC_GSS_VERSION
)
923 gc
->gc_proc
= ntohl(svc_getu32(argv
));
924 gc
->gc_seq
= ntohl(svc_getu32(argv
));
925 gc
->gc_svc
= ntohl(svc_getu32(argv
));
926 if (svc_safe_getnetobj(argv
, &gc
->gc_ctx
))
928 if (crlen
!= round_up_to_quad(gc
->gc_ctx
.len
) + 5 * 4)
931 if ((gc
->gc_proc
!= RPC_GSS_PROC_DATA
) && (rqstp
->rq_proc
!= 0))
935 * We've successfully parsed the credential. Let's check out the
936 * verifier. An AUTH_NULL verifier is allowed (and required) for
937 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for
938 * PROC_DATA and PROC_DESTROY.
940 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length).
941 * AUTH_RPCSEC_GSS verifier is:
942 * 6 (AUTH_RPCSEC_GSS), length, checksum.
943 * checksum is calculated over rpcheader from xid up to here.
945 *authp
= rpc_autherr_badverf
;
946 switch (gc
->gc_proc
) {
947 case RPC_GSS_PROC_INIT
:
948 case RPC_GSS_PROC_CONTINUE_INIT
:
949 if (argv
->iov_len
< 2 * 4)
951 if (ntohl(svc_getu32(argv
)) != RPC_AUTH_NULL
)
953 if (ntohl(svc_getu32(argv
)) != 0)
956 case RPC_GSS_PROC_DATA
:
957 case RPC_GSS_PROC_DESTROY
:
958 *authp
= rpcsec_gsserr_credproblem
;
959 rsci
= gss_svc_searchbyctx(&gc
->gc_ctx
);
962 switch (gss_verify_header(rqstp
, rsci
, rpcstart
, gc
, authp
)) {
972 *authp
= rpc_autherr_rejectedcred
;
976 /* now act upon the command: */
977 switch (gc
->gc_proc
) {
978 case RPC_GSS_PROC_INIT
:
979 case RPC_GSS_PROC_CONTINUE_INIT
:
980 *authp
= rpc_autherr_badcred
;
981 if (gc
->gc_proc
== RPC_GSS_PROC_INIT
&& gc
->gc_ctx
.len
!= 0)
983 memset(&rsikey
, 0, sizeof(rsikey
));
984 if (dup_netobj(&rsikey
.in_handle
, &gc
->gc_ctx
))
986 *authp
= rpc_autherr_badverf
;
987 if (svc_safe_getnetobj(argv
, &tmpobj
)) {
988 kfree(rsikey
.in_handle
.data
);
991 if (dup_netobj(&rsikey
.in_token
, &tmpobj
)) {
992 kfree(rsikey
.in_handle
.data
);
996 rsip
= rsi_lookup(&rsikey
);
1001 switch(cache_check(&rsi_cache
, &rsip
->h
, &rqstp
->rq_chandle
)) {
1007 if (gss_write_init_verf(rqstp
, rsip
))
1009 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1011 svc_putu32(resv
, rpc_success
);
1012 if (svc_safe_putnetobj(resv
, &rsip
->out_handle
))
1014 if (resv
->iov_len
+ 3 * 4 > PAGE_SIZE
)
1016 svc_putu32(resv
, htonl(rsip
->major_status
));
1017 svc_putu32(resv
, htonl(rsip
->minor_status
));
1018 svc_putu32(resv
, htonl(GSS_SEQ_WIN
));
1019 if (svc_safe_putnetobj(resv
, &rsip
->out_token
))
1021 rqstp
->rq_client
= NULL
;
1024 case RPC_GSS_PROC_DESTROY
:
1025 set_bit(CACHE_NEGATIVE
, &rsci
->h
.flags
);
1026 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1028 svc_putu32(resv
, rpc_success
);
1030 case RPC_GSS_PROC_DATA
:
1031 *authp
= rpcsec_gsserr_ctxproblem
;
1032 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1034 rqstp
->rq_cred
= rsci
->cred
;
1035 get_group_info(rsci
->cred
.cr_group_info
);
1036 *authp
= rpc_autherr_badcred
;
1037 switch (gc
->gc_svc
) {
1038 case RPC_GSS_SVC_NONE
:
1040 case RPC_GSS_SVC_INTEGRITY
:
1041 if (unwrap_integ_data(&rqstp
->rq_arg
,
1042 gc
->gc_seq
, rsci
->mechctx
))
1044 /* placeholders for length and seq. number: */
1045 svcdata
->body_start
= resv
->iov_base
+ resv
->iov_len
;
1046 svc_putu32(resv
, 0);
1047 svc_putu32(resv
, 0);
1049 case RPC_GSS_SVC_PRIVACY
:
1050 /* currently unsupported */
1054 svcdata
->rsci
= rsci
;
1055 cache_get(&rsci
->h
);
1060 /* Restore write pointer to original value: */
1061 xdr_ressize_check(rqstp
, reject_stat
);
1071 cache_put(&rsci
->h
, &rsc_cache
);
1076 svcauth_gss_release(struct svc_rqst
*rqstp
)
1078 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1079 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1080 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1081 struct xdr_buf integ_buf
;
1082 struct xdr_netobj mic
;
1085 int integ_offset
, integ_len
;
1088 if (gc
->gc_proc
!= RPC_GSS_PROC_DATA
)
1090 /* Release can be called twice, but we only wrap once. */
1091 if (gsd
->body_start
== NULL
)
1093 /* normally not set till svc_send, but we need it here: */
1094 resbuf
->len
= resbuf
->head
[0].iov_len
1095 + resbuf
->page_len
+ resbuf
->tail
[0].iov_len
;
1096 switch (gc
->gc_svc
) {
1097 case RPC_GSS_SVC_NONE
:
1099 case RPC_GSS_SVC_INTEGRITY
:
1100 p
= gsd
->body_start
;
1101 gsd
->body_start
= NULL
;
1102 /* move accept_stat to right place: */
1103 memcpy(p
, p
+ 2, 4);
1104 /* don't wrap in failure case: */
1105 /* Note: counting on not getting here if call was not even
1107 if (*p
!= rpc_success
) {
1108 resbuf
->head
[0].iov_len
-= 2 * 4;
1112 integ_offset
= (u8
*)(p
+ 1) - (u8
*)resbuf
->head
[0].iov_base
;
1113 integ_len
= resbuf
->len
- integ_offset
;
1114 BUG_ON(integ_len
% 4);
1115 *p
++ = htonl(integ_len
);
1116 *p
++ = htonl(gc
->gc_seq
);
1117 if (xdr_buf_subsegment(resbuf
, &integ_buf
, integ_offset
,
1120 if (resbuf
->page_len
== 0
1121 && resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
1123 BUG_ON(resbuf
->tail
[0].iov_len
);
1124 /* Use head for everything */
1125 resv
= &resbuf
->head
[0];
1126 } else if (resbuf
->tail
[0].iov_base
== NULL
) {
1127 if (resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
1130 resbuf
->tail
[0].iov_base
=
1131 resbuf
->head
[0].iov_base
1132 + resbuf
->head
[0].iov_len
;
1133 resbuf
->tail
[0].iov_len
= 0;
1134 rqstp
->rq_restailpage
= 0;
1135 resv
= &resbuf
->tail
[0];
1137 resv
= &resbuf
->tail
[0];
1139 mic
.data
= (u8
*)resv
->iov_base
+ resv
->iov_len
+ 4;
1140 if (gss_get_mic(gsd
->rsci
->mechctx
, &integ_buf
, &mic
))
1142 svc_putu32(resv
, htonl(mic
.len
));
1143 memset(mic
.data
+ mic
.len
, 0,
1144 round_up_to_quad(mic
.len
) - mic
.len
);
1145 resv
->iov_len
+= XDR_QUADLEN(mic
.len
) << 2;
1146 /* not strictly required: */
1147 resbuf
->len
+= XDR_QUADLEN(mic
.len
) << 2;
1148 BUG_ON(resv
->iov_len
> PAGE_SIZE
);
1150 case RPC_GSS_SVC_PRIVACY
:
1158 if (rqstp
->rq_client
)
1159 auth_domain_put(rqstp
->rq_client
);
1160 rqstp
->rq_client
= NULL
;
1161 if (rqstp
->rq_cred
.cr_group_info
)
1162 put_group_info(rqstp
->rq_cred
.cr_group_info
);
1163 rqstp
->rq_cred
.cr_group_info
= NULL
;
1165 cache_put(&gsd
->rsci
->h
, &rsc_cache
);
1172 svcauth_gss_domain_release(struct auth_domain
*dom
)
1174 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
1180 static struct auth_ops svcauthops_gss
= {
1181 .name
= "rpcsec_gss",
1182 .owner
= THIS_MODULE
,
1183 .flavour
= RPC_AUTH_GSS
,
1184 .accept
= svcauth_gss_accept
,
1185 .release
= svcauth_gss_release
,
1186 .domain_release
= svcauth_gss_domain_release
,
1187 .set_client
= svcauth_gss_set_client
,
1193 int rv
= svc_auth_register(RPC_AUTH_GSS
, &svcauthops_gss
);
1195 cache_register(&rsc_cache
);
1196 cache_register(&rsi_cache
);
1202 gss_svc_shutdown(void)
1204 if (cache_unregister(&rsc_cache
))
1205 printk(KERN_ERR
"auth_rpcgss: failed to unregister rsc cache\n");
1206 if (cache_unregister(&rsi_cache
))
1207 printk(KERN_ERR
"auth_rpcgss: failed to unregister rsi cache\n");
1208 svc_auth_unregister(RPC_AUTH_GSS
);