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_lookup(struct rsi
*item
, int set
);
83 static void rsi_free(struct rsi
*rsii
)
85 kfree(rsii
->in_handle
.data
);
86 kfree(rsii
->in_token
.data
);
87 kfree(rsii
->out_handle
.data
);
88 kfree(rsii
->out_token
.data
);
91 static void rsi_put(struct cache_head
*item
, struct cache_detail
*cd
)
93 struct rsi
*rsii
= container_of(item
, struct rsi
, h
);
94 if (cache_put(item
, cd
)) {
100 static inline int rsi_hash(struct rsi
*item
)
102 return hash_mem(item
->in_handle
.data
, item
->in_handle
.len
, RSI_HASHBITS
)
103 ^ hash_mem(item
->in_token
.data
, item
->in_token
.len
, RSI_HASHBITS
);
106 static inline int rsi_match(struct rsi
*item
, struct rsi
*tmp
)
108 return netobj_equal(&item
->in_handle
, &tmp
->in_handle
)
109 && netobj_equal(&item
->in_token
, &tmp
->in_token
);
112 static int dup_to_netobj(struct xdr_netobj
*dst
, char *src
, int len
)
115 dst
->data
= (len
? kmalloc(len
, GFP_KERNEL
) : NULL
);
117 memcpy(dst
->data
, src
, len
);
118 if (len
&& !dst
->data
)
123 static inline int dup_netobj(struct xdr_netobj
*dst
, struct xdr_netobj
*src
)
125 return dup_to_netobj(dst
, src
->data
, src
->len
);
128 static inline void rsi_init(struct rsi
*new, struct rsi
*item
)
130 new->out_handle
.data
= NULL
;
131 new->out_handle
.len
= 0;
132 new->out_token
.data
= NULL
;
133 new->out_token
.len
= 0;
134 new->in_handle
.len
= item
->in_handle
.len
;
135 item
->in_handle
.len
= 0;
136 new->in_token
.len
= item
->in_token
.len
;
137 item
->in_token
.len
= 0;
138 new->in_handle
.data
= item
->in_handle
.data
;
139 item
->in_handle
.data
= NULL
;
140 new->in_token
.data
= item
->in_token
.data
;
141 item
->in_token
.data
= NULL
;
144 static inline void rsi_update(struct rsi
*new, struct rsi
*item
)
146 BUG_ON(new->out_handle
.data
|| new->out_token
.data
);
147 new->out_handle
.len
= item
->out_handle
.len
;
148 item
->out_handle
.len
= 0;
149 new->out_token
.len
= item
->out_token
.len
;
150 item
->out_token
.len
= 0;
151 new->out_handle
.data
= item
->out_handle
.data
;
152 item
->out_handle
.data
= NULL
;
153 new->out_token
.data
= item
->out_token
.data
;
154 item
->out_token
.data
= NULL
;
156 new->major_status
= item
->major_status
;
157 new->minor_status
= item
->minor_status
;
160 static void rsi_request(struct cache_detail
*cd
,
161 struct cache_head
*h
,
162 char **bpp
, int *blen
)
164 struct rsi
*rsii
= container_of(h
, struct rsi
, h
);
166 qword_addhex(bpp
, blen
, rsii
->in_handle
.data
, rsii
->in_handle
.len
);
167 qword_addhex(bpp
, blen
, rsii
->in_token
.data
, rsii
->in_token
.len
);
172 static int rsi_parse(struct cache_detail
*cd
,
173 char *mesg
, int mlen
)
175 /* context token expiry major minor context token */
179 struct rsi rsii
, *rsip
= NULL
;
181 int status
= -EINVAL
;
183 memset(&rsii
, 0, sizeof(rsii
));
185 len
= qword_get(&mesg
, buf
, mlen
);
189 if (dup_to_netobj(&rsii
.in_handle
, buf
, len
))
193 len
= qword_get(&mesg
, buf
, mlen
);
198 if (dup_to_netobj(&rsii
.in_token
, buf
, len
))
203 expiry
= get_expiry(&mesg
);
209 len
= qword_get(&mesg
, buf
, mlen
);
215 rsii
.major_status
= simple_strtoul(buf
, &ep
, 10);
218 len
= qword_get(&mesg
, buf
, mlen
);
221 rsii
.minor_status
= simple_strtoul(buf
, &ep
, 10);
226 len
= qword_get(&mesg
, buf
, mlen
);
230 if (dup_to_netobj(&rsii
.out_handle
, buf
, len
))
234 len
= qword_get(&mesg
, buf
, mlen
);
239 if (dup_to_netobj(&rsii
.out_token
, buf
, len
))
242 rsii
.h
.expiry_time
= expiry
;
243 rsip
= rsi_lookup(&rsii
, 1);
248 rsi_put(&rsip
->h
, &rsi_cache
);
252 static struct cache_detail rsi_cache
= {
253 .owner
= THIS_MODULE
,
254 .hash_size
= RSI_HASHMAX
,
255 .hash_table
= rsi_table
,
256 .name
= "auth.rpcsec.init",
257 .cache_put
= rsi_put
,
258 .cache_request
= rsi_request
,
259 .cache_parse
= rsi_parse
,
262 static DefineSimpleCacheLookup(rsi
, 0)
265 * The rpcsec_context cache is used to store a context that is
266 * used in data exchange.
267 * The key is a context handle. The content is:
268 * uid, gidlist, mechanism, service-set, mech-specific-data
271 #define RSC_HASHBITS 10
272 #define RSC_HASHMAX (1<<RSC_HASHBITS)
273 #define RSC_HASHMASK (RSC_HASHMAX-1)
275 #define GSS_SEQ_WIN 128
277 struct gss_svc_seq_data
{
278 /* highest seq number seen so far: */
280 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
281 * sd_win is nonzero iff sequence number i has been seen already: */
282 unsigned long sd_win
[GSS_SEQ_WIN
/BITS_PER_LONG
];
288 struct xdr_netobj handle
;
289 struct svc_cred cred
;
290 struct gss_svc_seq_data seqdata
;
291 struct gss_ctx
*mechctx
;
294 static struct cache_head
*rsc_table
[RSC_HASHMAX
];
295 static struct cache_detail rsc_cache
;
296 static struct rsc
*rsc_lookup(struct rsc
*item
, int set
);
298 static void rsc_free(struct rsc
*rsci
)
300 kfree(rsci
->handle
.data
);
302 gss_delete_sec_context(&rsci
->mechctx
);
303 if (rsci
->cred
.cr_group_info
)
304 put_group_info(rsci
->cred
.cr_group_info
);
307 static void rsc_put(struct cache_head
*item
, struct cache_detail
*cd
)
309 struct rsc
*rsci
= container_of(item
, struct rsc
, h
);
311 if (cache_put(item
, cd
)) {
318 rsc_hash(struct rsc
*rsci
)
320 return hash_mem(rsci
->handle
.data
, rsci
->handle
.len
, RSC_HASHBITS
);
324 rsc_match(struct rsc
*new, struct rsc
*tmp
)
326 return netobj_equal(&new->handle
, &tmp
->handle
);
330 rsc_init(struct rsc
*new, struct rsc
*tmp
)
332 new->handle
.len
= tmp
->handle
.len
;
334 new->handle
.data
= tmp
->handle
.data
;
335 tmp
->handle
.data
= NULL
;
337 new->cred
.cr_group_info
= NULL
;
341 rsc_update(struct rsc
*new, struct rsc
*tmp
)
343 new->mechctx
= tmp
->mechctx
;
345 memset(&new->seqdata
, 0, sizeof(new->seqdata
));
346 spin_lock_init(&new->seqdata
.sd_lock
);
347 new->cred
= tmp
->cred
;
348 tmp
->cred
.cr_group_info
= NULL
;
351 static int rsc_parse(struct cache_detail
*cd
,
352 char *mesg
, int mlen
)
354 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
357 struct rsc rsci
, *rscp
= NULL
;
359 int status
= -EINVAL
;
361 memset(&rsci
, 0, sizeof(rsci
));
363 len
= qword_get(&mesg
, buf
, mlen
);
364 if (len
< 0) goto out
;
366 if (dup_to_netobj(&rsci
.handle
, buf
, len
))
371 expiry
= get_expiry(&mesg
);
376 /* uid, or NEGATIVE */
377 rv
= get_int(&mesg
, &rsci
.cred
.cr_uid
);
381 set_bit(CACHE_NEGATIVE
, &rsci
.h
.flags
);
384 struct gss_api_mech
*gm
;
387 if (get_int(&mesg
, &rsci
.cred
.cr_gid
))
390 /* number of additional gid's */
391 if (get_int(&mesg
, &N
))
394 rsci
.cred
.cr_group_info
= groups_alloc(N
);
395 if (rsci
.cred
.cr_group_info
== NULL
)
400 for (i
=0; i
<N
; i
++) {
402 if (get_int(&mesg
, &gid
))
404 GROUP_AT(rsci
.cred
.cr_group_info
, i
) = gid
;
408 len
= qword_get(&mesg
, buf
, mlen
);
411 gm
= gss_mech_get_by_name(buf
);
412 status
= -EOPNOTSUPP
;
417 /* mech-specific data: */
418 len
= qword_get(&mesg
, buf
, mlen
);
423 status
= gss_import_sec_context(buf
, len
, gm
, &rsci
.mechctx
);
430 rsci
.h
.expiry_time
= expiry
;
431 rscp
= rsc_lookup(&rsci
, 1);
436 rsc_put(&rscp
->h
, &rsc_cache
);
440 static struct cache_detail rsc_cache
= {
441 .owner
= THIS_MODULE
,
442 .hash_size
= RSC_HASHMAX
,
443 .hash_table
= rsc_table
,
444 .name
= "auth.rpcsec.context",
445 .cache_put
= rsc_put
,
446 .cache_parse
= rsc_parse
,
449 static DefineSimpleCacheLookup(rsc
, 0);
452 gss_svc_searchbyctx(struct xdr_netobj
*handle
)
457 memset(&rsci
, 0, sizeof(rsci
));
458 if (dup_to_netobj(&rsci
.handle
, handle
->data
, handle
->len
))
460 found
= rsc_lookup(&rsci
, 0);
464 if (cache_check(&rsc_cache
, &found
->h
, NULL
))
469 /* Implements sequence number algorithm as specified in RFC 2203. */
471 gss_check_seq_num(struct rsc
*rsci
, int seq_num
)
473 struct gss_svc_seq_data
*sd
= &rsci
->seqdata
;
475 spin_lock(&sd
->sd_lock
);
476 if (seq_num
> sd
->sd_max
) {
477 if (seq_num
>= sd
->sd_max
+ GSS_SEQ_WIN
) {
478 memset(sd
->sd_win
,0,sizeof(sd
->sd_win
));
479 sd
->sd_max
= seq_num
;
480 } else while (sd
->sd_max
< seq_num
) {
482 __clear_bit(sd
->sd_max
% GSS_SEQ_WIN
, sd
->sd_win
);
484 __set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
);
486 } else if (seq_num
<= sd
->sd_max
- GSS_SEQ_WIN
) {
489 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
490 if (__test_and_set_bit(seq_num
% GSS_SEQ_WIN
, sd
->sd_win
))
493 spin_unlock(&sd
->sd_lock
);
496 spin_unlock(&sd
->sd_lock
);
500 static inline u32
round_up_to_quad(u32 i
)
502 return (i
+ 3 ) & ~3;
506 svc_safe_getnetobj(struct kvec
*argv
, struct xdr_netobj
*o
)
510 if (argv
->iov_len
< 4)
512 o
->len
= ntohl(svc_getu32(argv
));
513 l
= round_up_to_quad(o
->len
);
514 if (argv
->iov_len
< l
)
516 o
->data
= argv
->iov_base
;
523 svc_safe_putnetobj(struct kvec
*resv
, struct xdr_netobj
*o
)
527 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
529 svc_putu32(resv
, htonl(o
->len
));
530 p
= resv
->iov_base
+ resv
->iov_len
;
531 resv
->iov_len
+= round_up_to_quad(o
->len
);
532 if (resv
->iov_len
> PAGE_SIZE
)
534 memcpy(p
, o
->data
, o
->len
);
535 memset((u8
*)p
+ o
->len
, 0, round_up_to_quad(o
->len
) - o
->len
);
539 /* Verify the checksum on the header and return SVC_OK on success.
540 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
541 * or return SVC_DENIED and indicate error in authp.
544 gss_verify_header(struct svc_rqst
*rqstp
, struct rsc
*rsci
,
545 u32
*rpcstart
, struct rpc_gss_wire_cred
*gc
, u32
*authp
)
547 struct gss_ctx
*ctx_id
= rsci
->mechctx
;
548 struct xdr_buf rpchdr
;
549 struct xdr_netobj checksum
;
551 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
554 /* data to compute the checksum over: */
555 iov
.iov_base
= rpcstart
;
556 iov
.iov_len
= (u8
*)argv
->iov_base
- (u8
*)rpcstart
;
557 xdr_buf_from_iov(&iov
, &rpchdr
);
559 *authp
= rpc_autherr_badverf
;
560 if (argv
->iov_len
< 4)
562 flavor
= ntohl(svc_getu32(argv
));
563 if (flavor
!= RPC_AUTH_GSS
)
565 if (svc_safe_getnetobj(argv
, &checksum
))
568 if (rqstp
->rq_deferred
) /* skip verification of revisited request */
570 if (gss_verify_mic(ctx_id
, &rpchdr
, &checksum
) != GSS_S_COMPLETE
) {
571 *authp
= rpcsec_gsserr_credproblem
;
575 if (gc
->gc_seq
> MAXSEQ
) {
576 dprintk("RPC: svcauth_gss: discarding request with large sequence number %d\n",
578 *authp
= rpcsec_gsserr_ctxproblem
;
581 if (!gss_check_seq_num(rsci
, gc
->gc_seq
)) {
582 dprintk("RPC: svcauth_gss: discarding request with old sequence number %d\n",
590 gss_write_null_verf(struct svc_rqst
*rqstp
)
594 svc_putu32(rqstp
->rq_res
.head
, htonl(RPC_AUTH_NULL
));
595 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
596 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
598 if (!xdr_ressize_check(rqstp
, p
))
604 gss_write_verf(struct svc_rqst
*rqstp
, struct gss_ctx
*ctx_id
, u32 seq
)
608 struct xdr_buf verf_data
;
609 struct xdr_netobj mic
;
613 svc_putu32(rqstp
->rq_res
.head
, htonl(RPC_AUTH_GSS
));
614 xdr_seq
= htonl(seq
);
616 iov
.iov_base
= &xdr_seq
;
617 iov
.iov_len
= sizeof(xdr_seq
);
618 xdr_buf_from_iov(&iov
, &verf_data
);
619 p
= rqstp
->rq_res
.head
->iov_base
+ rqstp
->rq_res
.head
->iov_len
;
620 mic
.data
= (u8
*)(p
+ 1);
621 maj_stat
= gss_get_mic(ctx_id
, &verf_data
, &mic
);
622 if (maj_stat
!= GSS_S_COMPLETE
)
624 *p
++ = htonl(mic
.len
);
625 memset((u8
*)p
+ mic
.len
, 0, round_up_to_quad(mic
.len
) - mic
.len
);
626 p
+= XDR_QUADLEN(mic
.len
);
627 if (!xdr_ressize_check(rqstp
, p
))
633 struct auth_domain h
;
637 static struct auth_domain
*
638 find_gss_auth_domain(struct gss_ctx
*ctx
, u32 svc
)
642 name
= gss_service_to_auth_domain_name(ctx
->mech_type
, svc
);
645 return auth_domain_find(name
);
648 static struct auth_ops svcauthops_gss
;
651 svcauth_gss_register_pseudoflavor(u32 pseudoflavor
, char * name
)
653 struct gss_domain
*new;
654 struct auth_domain
*test
;
657 new = kmalloc(sizeof(*new), GFP_KERNEL
);
660 kref_init(&new->h
.ref
);
661 new->h
.name
= kmalloc(strlen(name
) + 1, GFP_KERNEL
);
664 strcpy(new->h
.name
, name
);
665 new->h
.flavour
= &svcauthops_gss
;
666 new->pseudoflavor
= pseudoflavor
;
668 test
= auth_domain_lookup(name
, &new->h
);
669 if (test
!= &new->h
) { /* XXX Duplicate registration? */
670 auth_domain_put(&new->h
);
671 /* dangling ref-count... */
682 EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor
);
685 read_u32_from_xdr_buf(struct xdr_buf
*buf
, int base
, u32
*obj
)
690 status
= read_bytes_from_xdr_buf(buf
, base
, &raw
, sizeof(*obj
));
697 /* It would be nice if this bit of code could be shared with the client.
699 * The client shouldn't malloc(), would have to pass in own memory.
700 * The server uses base of head iovec as read pointer, while the
701 * client uses separate pointer. */
703 unwrap_integ_data(struct xdr_buf
*buf
, u32 seq
, struct gss_ctx
*ctx
)
706 u32 integ_len
, maj_stat
;
707 struct xdr_netobj mic
;
708 struct xdr_buf integ_buf
;
710 integ_len
= ntohl(svc_getu32(&buf
->head
[0]));
713 if (integ_len
> buf
->len
)
715 if (xdr_buf_subsegment(buf
, &integ_buf
, 0, integ_len
))
717 /* copy out mic... */
718 if (read_u32_from_xdr_buf(buf
, integ_len
, &mic
.len
))
720 if (mic
.len
> RPC_MAX_AUTH_SIZE
)
722 mic
.data
= kmalloc(mic
.len
, GFP_KERNEL
);
725 if (read_bytes_from_xdr_buf(buf
, integ_len
+ 4, mic
.data
, mic
.len
))
727 maj_stat
= gss_verify_mic(ctx
, &integ_buf
, &mic
);
728 if (maj_stat
!= GSS_S_COMPLETE
)
730 if (ntohl(svc_getu32(&buf
->head
[0])) != seq
)
737 struct gss_svc_data
{
738 /* decoded gss client cred: */
739 struct rpc_gss_wire_cred clcred
;
740 /* pointer to the beginning of the procedure-specific results,
741 * which may be encrypted/checksummed in svcauth_gss_release: */
747 svcauth_gss_set_client(struct svc_rqst
*rqstp
)
749 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
750 struct rsc
*rsci
= svcdata
->rsci
;
751 struct rpc_gss_wire_cred
*gc
= &svcdata
->clcred
;
753 rqstp
->rq_client
= find_gss_auth_domain(rsci
->mechctx
, gc
->gc_svc
);
754 if (rqstp
->rq_client
== NULL
)
760 gss_write_init_verf(struct svc_rqst
*rqstp
, struct rsi
*rsip
)
764 if (rsip
->major_status
!= GSS_S_COMPLETE
)
765 return gss_write_null_verf(rqstp
);
766 rsci
= gss_svc_searchbyctx(&rsip
->out_handle
);
768 rsip
->major_status
= GSS_S_NO_CONTEXT
;
769 return gss_write_null_verf(rqstp
);
771 return gss_write_verf(rqstp
, rsci
->mechctx
, GSS_SEQ_WIN
);
775 * Accept an rpcsec packet.
776 * If context establishment, punt to user space
777 * If data exchange, verify/decrypt
778 * If context destruction, handle here
779 * In the context establishment and destruction case we encode
780 * response here and return SVC_COMPLETE.
783 svcauth_gss_accept(struct svc_rqst
*rqstp
, u32
*authp
)
785 struct kvec
*argv
= &rqstp
->rq_arg
.head
[0];
786 struct kvec
*resv
= &rqstp
->rq_res
.head
[0];
788 struct xdr_netobj tmpobj
;
789 struct gss_svc_data
*svcdata
= rqstp
->rq_auth_data
;
790 struct rpc_gss_wire_cred
*gc
;
791 struct rsc
*rsci
= NULL
;
792 struct rsi
*rsip
, rsikey
;
794 u32
*reject_stat
= resv
->iov_base
+ resv
->iov_len
;
797 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",argv
->iov_len
);
799 *authp
= rpc_autherr_badcred
;
801 svcdata
= kmalloc(sizeof(*svcdata
), GFP_KERNEL
);
804 rqstp
->rq_auth_data
= svcdata
;
805 svcdata
->body_start
= NULL
;
806 svcdata
->rsci
= NULL
;
807 gc
= &svcdata
->clcred
;
809 /* start of rpc packet is 7 u32's back from here:
810 * xid direction rpcversion prog vers proc flavour
812 rpcstart
= argv
->iov_base
;
816 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
817 * at least 5 u32s, and is preceeded by length, so that makes 6.
820 if (argv
->iov_len
< 5 * 4)
822 crlen
= ntohl(svc_getu32(argv
));
823 if (ntohl(svc_getu32(argv
)) != RPC_GSS_VERSION
)
825 gc
->gc_proc
= ntohl(svc_getu32(argv
));
826 gc
->gc_seq
= ntohl(svc_getu32(argv
));
827 gc
->gc_svc
= ntohl(svc_getu32(argv
));
828 if (svc_safe_getnetobj(argv
, &gc
->gc_ctx
))
830 if (crlen
!= round_up_to_quad(gc
->gc_ctx
.len
) + 5 * 4)
833 if ((gc
->gc_proc
!= RPC_GSS_PROC_DATA
) && (rqstp
->rq_proc
!= 0))
837 * We've successfully parsed the credential. Let's check out the
838 * verifier. An AUTH_NULL verifier is allowed (and required) for
839 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for
840 * PROC_DATA and PROC_DESTROY.
842 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length).
843 * AUTH_RPCSEC_GSS verifier is:
844 * 6 (AUTH_RPCSEC_GSS), length, checksum.
845 * checksum is calculated over rpcheader from xid up to here.
847 *authp
= rpc_autherr_badverf
;
848 switch (gc
->gc_proc
) {
849 case RPC_GSS_PROC_INIT
:
850 case RPC_GSS_PROC_CONTINUE_INIT
:
851 if (argv
->iov_len
< 2 * 4)
853 if (ntohl(svc_getu32(argv
)) != RPC_AUTH_NULL
)
855 if (ntohl(svc_getu32(argv
)) != 0)
858 case RPC_GSS_PROC_DATA
:
859 case RPC_GSS_PROC_DESTROY
:
860 *authp
= rpcsec_gsserr_credproblem
;
861 rsci
= gss_svc_searchbyctx(&gc
->gc_ctx
);
864 switch (gss_verify_header(rqstp
, rsci
, rpcstart
, gc
, authp
)) {
874 *authp
= rpc_autherr_rejectedcred
;
878 /* now act upon the command: */
879 switch (gc
->gc_proc
) {
880 case RPC_GSS_PROC_INIT
:
881 case RPC_GSS_PROC_CONTINUE_INIT
:
882 *authp
= rpc_autherr_badcred
;
883 if (gc
->gc_proc
== RPC_GSS_PROC_INIT
&& gc
->gc_ctx
.len
!= 0)
885 memset(&rsikey
, 0, sizeof(rsikey
));
886 if (dup_netobj(&rsikey
.in_handle
, &gc
->gc_ctx
))
888 *authp
= rpc_autherr_badverf
;
889 if (svc_safe_getnetobj(argv
, &tmpobj
)) {
890 kfree(rsikey
.in_handle
.data
);
893 if (dup_netobj(&rsikey
.in_token
, &tmpobj
)) {
894 kfree(rsikey
.in_handle
.data
);
898 rsip
= rsi_lookup(&rsikey
, 0);
903 switch(cache_check(&rsi_cache
, &rsip
->h
, &rqstp
->rq_chandle
)) {
909 if (gss_write_init_verf(rqstp
, rsip
))
911 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
913 svc_putu32(resv
, rpc_success
);
914 if (svc_safe_putnetobj(resv
, &rsip
->out_handle
))
916 if (resv
->iov_len
+ 3 * 4 > PAGE_SIZE
)
918 svc_putu32(resv
, htonl(rsip
->major_status
));
919 svc_putu32(resv
, htonl(rsip
->minor_status
));
920 svc_putu32(resv
, htonl(GSS_SEQ_WIN
));
921 if (svc_safe_putnetobj(resv
, &rsip
->out_token
))
923 rqstp
->rq_client
= NULL
;
926 case RPC_GSS_PROC_DESTROY
:
927 set_bit(CACHE_NEGATIVE
, &rsci
->h
.flags
);
928 if (resv
->iov_len
+ 4 > PAGE_SIZE
)
930 svc_putu32(resv
, rpc_success
);
932 case RPC_GSS_PROC_DATA
:
933 *authp
= rpcsec_gsserr_ctxproblem
;
934 if (gss_write_verf(rqstp
, rsci
->mechctx
, gc
->gc_seq
))
936 rqstp
->rq_cred
= rsci
->cred
;
937 get_group_info(rsci
->cred
.cr_group_info
);
938 *authp
= rpc_autherr_badcred
;
939 switch (gc
->gc_svc
) {
940 case RPC_GSS_SVC_NONE
:
942 case RPC_GSS_SVC_INTEGRITY
:
943 if (unwrap_integ_data(&rqstp
->rq_arg
,
944 gc
->gc_seq
, rsci
->mechctx
))
946 /* placeholders for length and seq. number: */
947 svcdata
->body_start
= resv
->iov_base
+ resv
->iov_len
;
951 case RPC_GSS_SVC_PRIVACY
:
952 /* currently unsupported */
956 svcdata
->rsci
= rsci
;
962 /* Restore write pointer to original value: */
963 xdr_ressize_check(rqstp
, reject_stat
);
973 rsc_put(&rsci
->h
, &rsc_cache
);
978 svcauth_gss_release(struct svc_rqst
*rqstp
)
980 struct gss_svc_data
*gsd
= (struct gss_svc_data
*)rqstp
->rq_auth_data
;
981 struct rpc_gss_wire_cred
*gc
= &gsd
->clcred
;
982 struct xdr_buf
*resbuf
= &rqstp
->rq_res
;
983 struct xdr_buf integ_buf
;
984 struct xdr_netobj mic
;
987 int integ_offset
, integ_len
;
990 if (gc
->gc_proc
!= RPC_GSS_PROC_DATA
)
992 /* Release can be called twice, but we only wrap once. */
993 if (gsd
->body_start
== NULL
)
995 /* normally not set till svc_send, but we need it here: */
996 resbuf
->len
= resbuf
->head
[0].iov_len
997 + resbuf
->page_len
+ resbuf
->tail
[0].iov_len
;
998 switch (gc
->gc_svc
) {
999 case RPC_GSS_SVC_NONE
:
1001 case RPC_GSS_SVC_INTEGRITY
:
1002 p
= gsd
->body_start
;
1003 gsd
->body_start
= NULL
;
1004 /* move accept_stat to right place: */
1005 memcpy(p
, p
+ 2, 4);
1006 /* don't wrap in failure case: */
1007 /* Note: counting on not getting here if call was not even
1009 if (*p
!= rpc_success
) {
1010 resbuf
->head
[0].iov_len
-= 2 * 4;
1014 integ_offset
= (u8
*)(p
+ 1) - (u8
*)resbuf
->head
[0].iov_base
;
1015 integ_len
= resbuf
->len
- integ_offset
;
1016 BUG_ON(integ_len
% 4);
1017 *p
++ = htonl(integ_len
);
1018 *p
++ = htonl(gc
->gc_seq
);
1019 if (xdr_buf_subsegment(resbuf
, &integ_buf
, integ_offset
,
1022 if (resbuf
->page_len
== 0
1023 && resbuf
->tail
[0].iov_len
+ RPC_MAX_AUTH_SIZE
1025 BUG_ON(resbuf
->tail
[0].iov_len
);
1026 /* Use head for everything */
1027 resv
= &resbuf
->head
[0];
1028 } else if (resbuf
->tail
[0].iov_base
== NULL
) {
1029 /* copied from nfsd4_encode_read */
1030 svc_take_page(rqstp
);
1031 resbuf
->tail
[0].iov_base
= page_address(rqstp
1032 ->rq_respages
[rqstp
->rq_resused
-1]);
1033 rqstp
->rq_restailpage
= rqstp
->rq_resused
-1;
1034 resbuf
->tail
[0].iov_len
= 0;
1035 resv
= &resbuf
->tail
[0];
1037 resv
= &resbuf
->tail
[0];
1039 mic
.data
= (u8
*)resv
->iov_base
+ resv
->iov_len
+ 4;
1040 if (gss_get_mic(gsd
->rsci
->mechctx
, &integ_buf
, &mic
))
1042 svc_putu32(resv
, htonl(mic
.len
));
1043 memset(mic
.data
+ mic
.len
, 0,
1044 round_up_to_quad(mic
.len
) - mic
.len
);
1045 resv
->iov_len
+= XDR_QUADLEN(mic
.len
) << 2;
1046 /* not strictly required: */
1047 resbuf
->len
+= XDR_QUADLEN(mic
.len
) << 2;
1048 BUG_ON(resv
->iov_len
> PAGE_SIZE
);
1050 case RPC_GSS_SVC_PRIVACY
:
1058 if (rqstp
->rq_client
)
1059 auth_domain_put(rqstp
->rq_client
);
1060 rqstp
->rq_client
= NULL
;
1061 if (rqstp
->rq_cred
.cr_group_info
)
1062 put_group_info(rqstp
->rq_cred
.cr_group_info
);
1063 rqstp
->rq_cred
.cr_group_info
= NULL
;
1065 rsc_put(&gsd
->rsci
->h
, &rsc_cache
);
1072 svcauth_gss_domain_release(struct auth_domain
*dom
)
1074 struct gss_domain
*gd
= container_of(dom
, struct gss_domain
, h
);
1080 static struct auth_ops svcauthops_gss
= {
1081 .name
= "rpcsec_gss",
1082 .owner
= THIS_MODULE
,
1083 .flavour
= RPC_AUTH_GSS
,
1084 .accept
= svcauth_gss_accept
,
1085 .release
= svcauth_gss_release
,
1086 .domain_release
= svcauth_gss_domain_release
,
1087 .set_client
= svcauth_gss_set_client
,
1093 int rv
= svc_auth_register(RPC_AUTH_GSS
, &svcauthops_gss
);
1095 cache_register(&rsc_cache
);
1096 cache_register(&rsi_cache
);
1102 gss_svc_shutdown(void)
1104 if (cache_unregister(&rsc_cache
))
1105 printk(KERN_ERR
"auth_rpcgss: failed to unregister rsc cache\n");
1106 if (cache_unregister(&rsi_cache
))
1107 printk(KERN_ERR
"auth_rpcgss: failed to unregister rsi cache\n");
1108 svc_auth_unregister(RPC_AUTH_GSS
);