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
;
429 memset(&rsci
, 0, sizeof(rsci
));
431 len
= qword_get(&mesg
, buf
, mlen
);
432 if (len
< 0) goto out
;
434 if (dup_to_netobj(&rsci
.handle
, buf
, len
))
439 expiry
= get_expiry(&mesg
);
444 rscp
= rsc_lookup(&rsci
);
448 /* uid, or NEGATIVE */
449 rv
= get_int(&mesg
, &rsci
.cred
.cr_uid
);
453 set_bit(CACHE_NEGATIVE
, &rsci
.h
.flags
);
456 struct gss_api_mech
*gm
;
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
);
495 status
= gss_import_sec_context(buf
, len
, gm
, &rsci
.mechctx
);
502 rsci
.h
.expiry_time
= expiry
;
503 rscp
= rsc_update(&rsci
, rscp
);
508 cache_put(&rscp
->h
, &rsc_cache
);
514 static struct cache_detail rsc_cache
= {
515 .owner
= THIS_MODULE
,
516 .hash_size
= RSC_HASHMAX
,
517 .hash_table
= rsc_table
,
518 .name
= "auth.rpcsec.context",
519 .cache_put
= rsc_put
,
520 .cache_parse
= rsc_parse
,
523 .update
= update_rsc
,
527 static struct rsc
*rsc_lookup(struct rsc
*item
)
529 struct cache_head
*ch
;
530 int hash
= rsc_hash(item
);
532 ch
= sunrpc_cache_lookup(&rsc_cache
, &item
->h
, hash
);
534 return container_of(ch
, struct rsc
, h
);
539 static struct rsc
*rsc_update(struct rsc
*new, struct rsc
*old
)
541 struct cache_head
*ch
;
542 int hash
= rsc_hash(new);
544 ch
= sunrpc_cache_update(&rsc_cache
, &new->h
,
547 return container_of(ch
, struct rsc
, h
);
554 gss_svc_searchbyctx(struct xdr_netobj
*handle
)
559 memset(&rsci
, 0, sizeof(rsci
));
560 if (dup_to_netobj(&rsci
.handle
, handle
->data
, handle
->len
))
562 found
= rsc_lookup(&rsci
);
566 if (cache_check(&rsc_cache
, &found
->h
, NULL
))
571 /* Implements sequence number algorithm as specified in RFC 2203. */
573 gss_check_seq_num(struct rsc
*rsci
, int seq_num
)
575 struct gss_svc_seq_data
*sd
= &rsci
->seqdata
;
577 spin_lock(&sd
->sd_lock
);
578 if (seq_num
> sd
->sd_max
) {
579 if (seq_num
>= sd
->sd_max
+ GSS_SEQ_WIN
) {
580 memset(sd
->sd_win
,0,sizeof(sd
->sd_win
));
581 sd
->sd_max
= seq_num
;
582 } else while (sd
->sd_max
< seq_num
) {
584 __clear_bit(sd
->sd_max
% GSS_SEQ_WIN
, sd
->sd_win
);
586 __set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
);
588 } else if (seq_num
<= sd
->sd_max
- GSS_SEQ_WIN
) {
591 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
592 if (__test_and_set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
))
595 spin_unlock(&sd
->sd_lock
);
598 spin_unlock(&sd
->sd_lock
);
602 static inline u32
round_up_to_quad(u32 i
)
604 return (i
+ 3 ) & ~3;
608 svc_safe_getnetobj(struct kvec
*argv
, struct xdr_netobj
*o
)
612 if (argv
->iov_len
< 4)
614 o
->len
= ntohl(svc_getu32(argv
));
615 l
= round_up_to_quad(o
->len
);
616 if (argv
->iov_len
< l
)
618 o
->data
= argv
->iov_base
;
625 svc_safe_putnetobj(struct kvec
*resv
, struct xdr_netobj
*o
)
629 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
631 svc_putu32(resv
, htonl(o
->len
));
632 p
= resv
->iov_base
+ resv
->iov_len
;
633 resv
->iov_len
+= round_up_to_quad(o
->len
);
634 if (resv
->iov_len
> PAGE_SIZE
)
636 memcpy(p
, o
->data
, o
->len
);
637 memset((u8
*)p
+ o
->len
, 0, round_up_to_quad(o
->len
) - o
->len
);
641 /* Verify the checksum on the header and return SVC_OK on success.
642 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
643 * or return SVC_DENIED and indicate error in authp.
646 gss_verify_header(struct svc_rqst
*rqstp
, struct rsc
*rsci
,
647 u32
*rpcstart
, struct rpc_gss_wire_cred
*gc
, u32
*authp
)
649 struct gss_ctx
*ctx_id
= rsci
->mechctx
;
650 struct xdr_buf rpchdr
;
651 struct xdr_netobj checksum
;
653 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
656 /* data to compute the checksum over: */
657 iov
.iov_base
= rpcstart
;
658 iov
.iov_len
= (u8
*)argv
->iov_base
- (u8
*)rpcstart
;
659 xdr_buf_from_iov(&iov
, &rpchdr
);
661 *authp
= rpc_autherr_badverf
;
662 if (argv
->iov_len
< 4)
664 flavor
= ntohl(svc_getu32(argv
));
665 if (flavor
!= RPC_AUTH_GSS
)
667 if (svc_safe_getnetobj(argv
, &checksum
))
670 if (rqstp
->rq_deferred
) /* skip verification of revisited request */
672 if (gss_verify_mic(ctx_id
, &rpchdr
, &checksum
) != GSS_S_COMPLETE
) {
673 *authp
= rpcsec_gsserr_credproblem
;
677 if (gc
->gc_seq
> MAXSEQ
) {
678 dprintk("RPC: svcauth_gss: discarding request with large sequence number %d\n",
680 *authp
= rpcsec_gsserr_ctxproblem
;
683 if (!gss_check_seq_num(rsci
, gc
->gc_seq
)) {
684 dprintk("RPC: svcauth_gss: discarding request with old sequence number %d\n",
692 gss_write_null_verf(struct svc_rqst
*rqstp
)
696 svc_putu32(rqstp
->rq_res
.head
, htonl(RPC_AUTH_NULL
));
697 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
698 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
700 if (!xdr_ressize_check(rqstp
, p
))
706 gss_write_verf(struct svc_rqst
*rqstp
, struct gss_ctx
*ctx_id
, u32 seq
)
710 struct xdr_buf verf_data
;
711 struct xdr_netobj mic
;
715 svc_putu32(rqstp
->rq_res
.head
, htonl(RPC_AUTH_GSS
));
716 xdr_seq
= htonl(seq
);
718 iov
.iov_base
= &xdr_seq
;
719 iov
.iov_len
= sizeof(xdr_seq
);
720 xdr_buf_from_iov(&iov
, &verf_data
);
721 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
722 mic
.data
= (u8
*)(p
+ 1);
723 maj_stat
= gss_get_mic(ctx_id
, &verf_data
, &mic
);
724 if (maj_stat
!= GSS_S_COMPLETE
)
726 *p
++ = htonl(mic
.len
);
727 memset((u8
*)p
+ mic
.len
, 0, round_up_to_quad(mic
.len
) - mic
.len
);
728 p
+= XDR_QUADLEN(mic
.len
);
729 if (!xdr_ressize_check(rqstp
, p
))
735 struct auth_domain h
;
739 static struct auth_domain
*
740 find_gss_auth_domain(struct gss_ctx
*ctx
, u32 svc
)
744 name
= gss_service_to_auth_domain_name(ctx
->mech_type
, svc
);
747 return auth_domain_find(name
);
750 static struct auth_ops svcauthops_gss
;
753 svcauth_gss_register_pseudoflavor(u32 pseudoflavor
, char * name
)
755 struct gss_domain
*new;
756 struct auth_domain
*test
;
759 new = kmalloc(sizeof(*new), GFP_KERNEL
);
762 kref_init(&new->h
.ref
);
763 new->h
.name
= kmalloc(strlen(name
) + 1, GFP_KERNEL
);
766 strcpy(new->h
.name
, name
);
767 new->h
.flavour
= &svcauthops_gss
;
768 new->pseudoflavor
= pseudoflavor
;
770 test
= auth_domain_lookup(name
, &new->h
);
771 if (test
!= &new->h
) { /* XXX Duplicate registration? */
772 auth_domain_put(&new->h
);
773 /* dangling ref-count... */
784 EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor
);
787 read_u32_from_xdr_buf(struct xdr_buf
*buf
, int base
, u32
*obj
)
792 status
= read_bytes_from_xdr_buf(buf
, base
, &raw
, sizeof(*obj
));
799 /* It would be nice if this bit of code could be shared with the client.
801 * The client shouldn't malloc(), would have to pass in own memory.
802 * The server uses base of head iovec as read pointer, while the
803 * client uses separate pointer. */
805 unwrap_integ_data(struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
808 u32 integ_len
, maj_stat
;
809 struct xdr_netobj mic
;
810 struct xdr_buf integ_buf
;
812 integ_len
= ntohl(svc_getu32(&buf
->head
[0]));
815 if (integ_len
> buf
->len
)
817 if (xdr_buf_subsegment(buf
, &integ_buf
, 0, integ_len
))
819 /* copy out mic... */
820 if (read_u32_from_xdr_buf(buf
, integ_len
, &mic
.len
))
822 if (mic
.len
> RPC_MAX_AUTH_SIZE
)
824 mic
.data
= kmalloc(mic
.len
, GFP_KERNEL
);
827 if (read_bytes_from_xdr_buf(buf
, integ_len
+ 4, mic
.data
, mic
.len
))
829 maj_stat
= gss_verify_mic(ctx
, &integ_buf
, &mic
);
830 if (maj_stat
!= GSS_S_COMPLETE
)
832 if (ntohl(svc_getu32(&buf
->head
[0])) != seq
)
839 struct gss_svc_data
{
840 /* decoded gss client cred: */
841 struct rpc_gss_wire_cred clcred
;
842 /* pointer to the beginning of the procedure-specific results,
843 * which may be encrypted/checksummed in svcauth_gss_release: */
849 svcauth_gss_set_client(struct svc_rqst
*rqstp
)
851 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
852 struct rsc
*rsci
= svcdata
->rsci
;
853 struct rpc_gss_wire_cred
*gc
= &svcdata
->clcred
;
855 rqstp
->rq_client
= find_gss_auth_domain(rsci
->mechctx
, gc
->gc_svc
);
856 if (rqstp
->rq_client
== NULL
)
862 gss_write_init_verf(struct svc_rqst
*rqstp
, struct rsi
*rsip
)
866 if (rsip
->major_status
!= GSS_S_COMPLETE
)
867 return gss_write_null_verf(rqstp
);
868 rsci
= gss_svc_searchbyctx(&rsip
->out_handle
);
870 rsip
->major_status
= GSS_S_NO_CONTEXT
;
871 return gss_write_null_verf(rqstp
);
873 return gss_write_verf(rqstp
, rsci
->mechctx
, GSS_SEQ_WIN
);
877 * Accept an rpcsec packet.
878 * If context establishment, punt to user space
879 * If data exchange, verify/decrypt
880 * If context destruction, handle here
881 * In the context establishment and destruction case we encode
882 * response here and return SVC_COMPLETE.
885 svcauth_gss_accept(struct svc_rqst
*rqstp
, u32
*authp
)
887 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
888 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
890 struct xdr_netobj tmpobj
;
891 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
892 struct rpc_gss_wire_cred
*gc
;
893 struct rsc
*rsci
= NULL
;
894 struct rsi
*rsip
, rsikey
;
896 u32
*reject_stat
= resv
->iov_base
+ resv
->iov_len
;
899 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",argv
->iov_len
);
901 *authp
= rpc_autherr_badcred
;
903 svcdata
= kmalloc(sizeof(*svcdata
), GFP_KERNEL
);
906 rqstp
->rq_auth_data
= svcdata
;
907 svcdata
->body_start
= NULL
;
908 svcdata
->rsci
= NULL
;
909 gc
= &svcdata
->clcred
;
911 /* start of rpc packet is 7 u32's back from here:
912 * xid direction rpcversion prog vers proc flavour
914 rpcstart
= argv
->iov_base
;
918 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
919 * at least 5 u32s, and is preceeded by length, so that makes 6.
922 if (argv
->iov_len
< 5 * 4)
924 crlen
= ntohl(svc_getu32(argv
));
925 if (ntohl(svc_getu32(argv
)) != RPC_GSS_VERSION
)
927 gc
->gc_proc
= ntohl(svc_getu32(argv
));
928 gc
->gc_seq
= ntohl(svc_getu32(argv
));
929 gc
->gc_svc
= ntohl(svc_getu32(argv
));
930 if (svc_safe_getnetobj(argv
, &gc
->gc_ctx
))
932 if (crlen
!= round_up_to_quad(gc
->gc_ctx
.len
) + 5 * 4)
935 if ((gc
->gc_proc
!= RPC_GSS_PROC_DATA
) && (rqstp
->rq_proc
!= 0))
939 * We've successfully parsed the credential. Let's check out the
940 * verifier. An AUTH_NULL verifier is allowed (and required) for
941 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for
942 * PROC_DATA and PROC_DESTROY.
944 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length).
945 * AUTH_RPCSEC_GSS verifier is:
946 * 6 (AUTH_RPCSEC_GSS), length, checksum.
947 * checksum is calculated over rpcheader from xid up to here.
949 *authp
= rpc_autherr_badverf
;
950 switch (gc
->gc_proc
) {
951 case RPC_GSS_PROC_INIT
:
952 case RPC_GSS_PROC_CONTINUE_INIT
:
953 if (argv
->iov_len
< 2 * 4)
955 if (ntohl(svc_getu32(argv
)) != RPC_AUTH_NULL
)
957 if (ntohl(svc_getu32(argv
)) != 0)
960 case RPC_GSS_PROC_DATA
:
961 case RPC_GSS_PROC_DESTROY
:
962 *authp
= rpcsec_gsserr_credproblem
;
963 rsci
= gss_svc_searchbyctx(&gc
->gc_ctx
);
966 switch (gss_verify_header(rqstp
, rsci
, rpcstart
, gc
, authp
)) {
976 *authp
= rpc_autherr_rejectedcred
;
980 /* now act upon the command: */
981 switch (gc
->gc_proc
) {
982 case RPC_GSS_PROC_INIT
:
983 case RPC_GSS_PROC_CONTINUE_INIT
:
984 *authp
= rpc_autherr_badcred
;
985 if (gc
->gc_proc
== RPC_GSS_PROC_INIT
&& gc
->gc_ctx
.len
!= 0)
987 memset(&rsikey
, 0, sizeof(rsikey
));
988 if (dup_netobj(&rsikey
.in_handle
, &gc
->gc_ctx
))
990 *authp
= rpc_autherr_badverf
;
991 if (svc_safe_getnetobj(argv
, &tmpobj
)) {
992 kfree(rsikey
.in_handle
.data
);
995 if (dup_netobj(&rsikey
.in_token
, &tmpobj
)) {
996 kfree(rsikey
.in_handle
.data
);
1000 rsip
= rsi_lookup(&rsikey
);
1005 switch(cache_check(&rsi_cache
, &rsip
->h
, &rqstp
->rq_chandle
)) {
1011 if (gss_write_init_verf(rqstp
, rsip
))
1013 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1015 svc_putu32(resv
, rpc_success
);
1016 if (svc_safe_putnetobj(resv
, &rsip
->out_handle
))
1018 if (resv
->iov_len
+ 3 * 4 > PAGE_SIZE
)
1020 svc_putu32(resv
, htonl(rsip
->major_status
));
1021 svc_putu32(resv
, htonl(rsip
->minor_status
));
1022 svc_putu32(resv
, htonl(GSS_SEQ_WIN
));
1023 if (svc_safe_putnetobj(resv
, &rsip
->out_token
))
1025 rqstp
->rq_client
= NULL
;
1028 case RPC_GSS_PROC_DESTROY
:
1029 set_bit(CACHE_NEGATIVE
, &rsci
->h
.flags
);
1030 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
1032 svc_putu32(resv
, rpc_success
);
1034 case RPC_GSS_PROC_DATA
:
1035 *authp
= rpcsec_gsserr_ctxproblem
;
1036 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
1038 rqstp
->rq_cred
= rsci
->cred
;
1039 get_group_info(rsci
->cred
.cr_group_info
);
1040 *authp
= rpc_autherr_badcred
;
1041 switch (gc
->gc_svc
) {
1042 case RPC_GSS_SVC_NONE
:
1044 case RPC_GSS_SVC_INTEGRITY
:
1045 if (unwrap_integ_data(&rqstp
->rq_arg
,
1046 gc
->gc_seq
, rsci
->mechctx
))
1048 /* placeholders for length and seq. number: */
1049 svcdata
->body_start
= resv
->iov_base
+ resv
->iov_len
;
1050 svc_putu32(resv
, 0);
1051 svc_putu32(resv
, 0);
1053 case RPC_GSS_SVC_PRIVACY
:
1054 /* currently unsupported */
1058 svcdata
->rsci
= rsci
;
1059 cache_get(&rsci
->h
);
1064 /* Restore write pointer to original value: */
1065 xdr_ressize_check(rqstp
, reject_stat
);
1075 cache_put(&rsci
->h
, &rsc_cache
);
1080 svcauth_gss_release(struct svc_rqst
*rqstp
)
1082 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
1083 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
1084 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
1085 struct xdr_buf integ_buf
;
1086 struct xdr_netobj mic
;
1089 int integ_offset
, integ_len
;
1092 if (gc
->gc_proc
!= RPC_GSS_PROC_DATA
)
1094 /* Release can be called twice, but we only wrap once. */
1095 if (gsd
->body_start
== NULL
)
1097 /* normally not set till svc_send, but we need it here: */
1098 resbuf
->len
= resbuf
->head
[0].iov_len
1099 + resbuf
->page_len
+ resbuf
->tail
[0].iov_len
;
1100 switch (gc
->gc_svc
) {
1101 case RPC_GSS_SVC_NONE
:
1103 case RPC_GSS_SVC_INTEGRITY
:
1104 p
= gsd
->body_start
;
1105 gsd
->body_start
= NULL
;
1106 /* move accept_stat to right place: */
1107 memcpy(p
, p
+ 2, 4);
1108 /* don't wrap in failure case: */
1109 /* Note: counting on not getting here if call was not even
1111 if (*p
!= rpc_success
) {
1112 resbuf
->head
[0].iov_len
-= 2 * 4;
1116 integ_offset
= (u8
*)(p
+ 1) - (u8
*)resbuf
->head
[0].iov_base
;
1117 integ_len
= resbuf
->len
- integ_offset
;
1118 BUG_ON(integ_len
% 4);
1119 *p
++ = htonl(integ_len
);
1120 *p
++ = htonl(gc
->gc_seq
);
1121 if (xdr_buf_subsegment(resbuf
, &integ_buf
, integ_offset
,
1124 if (resbuf
->page_len
== 0
1125 && resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
1127 BUG_ON(resbuf
->tail
[0].iov_len
);
1128 /* Use head for everything */
1129 resv
= &resbuf
->head
[0];
1130 } else if (resbuf
->tail
[0].iov_base
== NULL
) {
1131 if (resbuf
->head
[0].iov_len
+ RPC_MAX_AUTH_SIZE
1134 resbuf
->tail
[0].iov_base
=
1135 resbuf
->head
[0].iov_base
1136 + resbuf
->head
[0].iov_len
;
1137 resbuf
->tail
[0].iov_len
= 0;
1138 rqstp
->rq_restailpage
= 0;
1139 resv
= &resbuf
->tail
[0];
1141 resv
= &resbuf
->tail
[0];
1143 mic
.data
= (u8
*)resv
->iov_base
+ resv
->iov_len
+ 4;
1144 if (gss_get_mic(gsd
->rsci
->mechctx
, &integ_buf
, &mic
))
1146 svc_putu32(resv
, htonl(mic
.len
));
1147 memset(mic
.data
+ mic
.len
, 0,
1148 round_up_to_quad(mic
.len
) - mic
.len
);
1149 resv
->iov_len
+= XDR_QUADLEN(mic
.len
) << 2;
1150 /* not strictly required: */
1151 resbuf
->len
+= XDR_QUADLEN(mic
.len
) << 2;
1152 BUG_ON(resv
->iov_len
> PAGE_SIZE
);
1154 case RPC_GSS_SVC_PRIVACY
:
1162 if (rqstp
->rq_client
)
1163 auth_domain_put(rqstp
->rq_client
);
1164 rqstp
->rq_client
= NULL
;
1165 if (rqstp
->rq_cred
.cr_group_info
)
1166 put_group_info(rqstp
->rq_cred
.cr_group_info
);
1167 rqstp
->rq_cred
.cr_group_info
= NULL
;
1169 cache_put(&gsd
->rsci
->h
, &rsc_cache
);
1176 svcauth_gss_domain_release(struct auth_domain
*dom
)
1178 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
1184 static struct auth_ops svcauthops_gss
= {
1185 .name
= "rpcsec_gss",
1186 .owner
= THIS_MODULE
,
1187 .flavour
= RPC_AUTH_GSS
,
1188 .accept
= svcauth_gss_accept
,
1189 .release
= svcauth_gss_release
,
1190 .domain_release
= svcauth_gss_domain_release
,
1191 .set_client
= svcauth_gss_set_client
,
1197 int rv
= svc_auth_register(RPC_AUTH_GSS
, &svcauthops_gss
);
1199 cache_register(&rsc_cache
);
1200 cache_register(&rsi_cache
);
1206 gss_svc_shutdown(void)
1208 if (cache_unregister(&rsc_cache
))
1209 printk(KERN_ERR
"auth_rpcgss: failed to unregister rsc cache\n");
1210 if (cache_unregister(&rsi_cache
))
1211 printk(KERN_ERR
"auth_rpcgss: failed to unregister rsi cache\n");
1212 svc_auth_unregister(RPC_AUTH_GSS
);