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 .hash_size = RSI_HASHMAX,
254 .hash_table = rsi_table,
255 .name = "auth.rpcsec.init",
256 .cache_put = rsi_put,
257 .cache_request = rsi_request,
258 .cache_parse = rsi_parse,
261 static DefineSimpleCacheLookup(rsi, 0)
264 * The rpcsec_context cache is used to store a context that is
265 * used in data exchange.
266 * The key is a context handle. The content is:
267 * uid, gidlist, mechanism, service-set, mech-specific-data
270 #define RSC_HASHBITS 10
271 #define RSC_HASHMAX (1<<RSC_HASHBITS)
272 #define RSC_HASHMASK (RSC_HASHMAX-1)
274 #define GSS_SEQ_WIN 128
276 struct gss_svc_seq_data {
277 /* highest seq number seen so far: */
279 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
280 * sd_win is nonzero iff sequence number i has been seen already: */
281 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
287 struct xdr_netobj handle;
288 struct svc_cred cred;
289 struct gss_svc_seq_data seqdata;
290 struct gss_ctx *mechctx;
293 static struct cache_head *rsc_table[RSC_HASHMAX];
294 static struct cache_detail rsc_cache;
295 static struct rsc *rsc_lookup(struct rsc *item, int set);
297 static void rsc_free(struct rsc *rsci)
299 kfree(rsci->handle.data);
301 gss_delete_sec_context(&rsci->mechctx);
302 if (rsci->cred.cr_group_info)
303 put_group_info(rsci->cred.cr_group_info);
306 static void rsc_put(struct cache_head *item, struct cache_detail *cd)
308 struct rsc *rsci = container_of(item, struct rsc, h);
310 if (cache_put(item, cd)) {
317 rsc_hash(struct rsc *rsci)
319 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
323 rsc_match(struct rsc *new, struct rsc *tmp)
325 return netobj_equal(&new->handle, &tmp->handle);
329 rsc_init(struct rsc *new, struct rsc *tmp)
331 new->handle.len = tmp->handle.len;
333 new->handle.data = tmp->handle.data;
334 tmp->handle.data = NULL;
339 rsc_update(struct rsc *new, struct rsc *tmp)
341 new->mechctx = tmp->mechctx;
343 memset(&new->seqdata, 0, sizeof(new->seqdata));
344 spin_lock_init(&new->seqdata.sd_lock);
345 new->cred = tmp->cred;
346 tmp->cred.cr_group_info = NULL;
349 static int rsc_parse(struct cache_detail *cd,
350 char *mesg, int mlen)
352 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
355 struct rsc rsci, *rscp = NULL;
357 int status = -EINVAL;
359 memset(&rsci, 0, sizeof(rsci));
361 len = qword_get(&mesg, buf, mlen);
362 if (len < 0) goto out;
364 if (dup_to_netobj(&rsci.handle, buf, len))
369 expiry = get_expiry(&mesg);
374 /* uid, or NEGATIVE */
375 rv = get_int(&mesg, &rsci.cred.cr_uid);
379 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
382 struct gss_api_mech *gm;
383 struct xdr_netobj tmp_buf;
386 if (get_int(&mesg, &rsci.cred.cr_gid))
389 /* number of additional gid's */
390 if (get_int(&mesg, &N))
393 rsci.cred.cr_group_info = groups_alloc(N);
394 if (rsci.cred.cr_group_info == NULL)
399 for (i=0; i<N; i++) {
401 if (get_int(&mesg, &gid))
403 GROUP_AT(rsci.cred.cr_group_info, i) = gid;
407 len = qword_get(&mesg, buf, mlen);
410 gm = gss_mech_get_by_name(buf);
411 status = -EOPNOTSUPP;
416 /* mech-specific data: */
417 len = qword_get(&mesg, buf, mlen);
424 if (gss_import_sec_context(&tmp_buf, 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 .hash_size = RSC_HASHMAX,
442 .hash_table = rsc_table,
443 .name = "auth.rpcsec.context",
444 .cache_put = rsc_put,
445 .cache_parse = rsc_parse,
448 static DefineSimpleCacheLookup(rsc, 0);
451 gss_svc_searchbyctx(struct xdr_netobj *handle)
456 rsci.handle = *handle;
457 found = rsc_lookup(&rsci, 0);
460 if (cache_check(&rsc_cache, &found->h, NULL))
465 /* Implements sequence number algorithm as specified in RFC 2203. */
467 gss_check_seq_num(struct rsc *rsci, int seq_num)
469 struct gss_svc_seq_data *sd = &rsci->seqdata;
471 spin_lock(&sd->sd_lock);
472 if (seq_num > sd->sd_max) {
473 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
474 memset(sd->sd_win,0,sizeof(sd->sd_win));
475 sd->sd_max = seq_num;
476 } else while (sd->sd_max < seq_num) {
478 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
480 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
482 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
485 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
486 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
489 spin_unlock(&sd->sd_lock);
492 spin_unlock(&sd->sd_lock);
496 static inline u32 round_up_to_quad(u32 i)
498 return (i + 3 ) & ~3;
502 svc_safe_getnetobj(struct iovec *argv, struct xdr_netobj *o)
506 if (argv->iov_len < 4)
508 o->len = ntohl(svc_getu32(argv));
509 l = round_up_to_quad(o->len);
510 if (argv->iov_len < l)
512 o->data = argv->iov_base;
519 svc_safe_putnetobj(struct iovec *resv, struct xdr_netobj *o)
523 if (resv->iov_len + 4 > PAGE_SIZE)
525 svc_putu32(resv, htonl(o->len));
526 p = resv->iov_base + resv->iov_len;
527 resv->iov_len += round_up_to_quad(o->len);
528 if (resv->iov_len > PAGE_SIZE)
530 memcpy(p, o->data, o->len);
531 memset((u8 *)p + o->len, 0, round_up_to_quad(o->len) - o->len);
535 /* Verify the checksum on the header and return SVC_OK on success.
536 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
537 * or return SVC_DENIED and indicate error in authp.
540 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
541 u32 *rpcstart, struct rpc_gss_wire_cred *gc, u32 *authp)
543 struct gss_ctx *ctx_id = rsci->mechctx;
544 struct xdr_buf rpchdr;
545 struct xdr_netobj checksum;
547 struct iovec *argv = &rqstp->rq_arg.head[0];
550 /* data to compute the checksum over: */
551 iov.iov_base = rpcstart;
552 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
553 xdr_buf_from_iov(&iov, &rpchdr);
555 *authp = rpc_autherr_badverf;
556 if (argv->iov_len < 4)
558 flavor = ntohl(svc_getu32(argv));
559 if (flavor != RPC_AUTH_GSS)
561 if (svc_safe_getnetobj(argv, &checksum))
564 if (rqstp->rq_deferred) /* skip verification of revisited request */
566 if (gss_verify_mic(ctx_id, &rpchdr, &checksum, NULL)
568 *authp = rpcsec_gsserr_credproblem;
572 if (gc->gc_seq > MAXSEQ) {
573 dprintk("RPC: svcauth_gss: discarding request with large sequence number %d\n",
575 *authp = rpcsec_gsserr_ctxproblem;
578 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
579 dprintk("RPC: svcauth_gss: discarding request with old sequence number %d\n",
587 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
591 struct xdr_buf verf_data;
592 struct xdr_netobj mic;
596 svc_putu32(rqstp->rq_res.head, htonl(RPC_AUTH_GSS));
597 xdr_seq = htonl(seq);
599 iov.iov_base = &xdr_seq;
600 iov.iov_len = sizeof(xdr_seq);
601 xdr_buf_from_iov(&iov, &verf_data);
602 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
603 mic.data = (u8 *)(p + 1);
604 maj_stat = gss_get_mic(ctx_id, 0, &verf_data, &mic);
605 if (maj_stat != GSS_S_COMPLETE)
607 *p++ = htonl(mic.len);
608 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
609 p += XDR_QUADLEN(mic.len);
610 if (!xdr_ressize_check(rqstp, p))
616 struct auth_domain h;
620 static struct auth_domain *
621 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
625 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
628 return auth_domain_find(name);
632 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
634 struct gss_domain *new;
635 struct auth_domain *test;
638 new = kmalloc(sizeof(*new), GFP_KERNEL);
641 cache_init(&new->h.h);
642 atomic_inc(&new->h.h.refcnt);
643 new->h.name = kmalloc(strlen(name) + 1, GFP_KERNEL);
646 strcpy(new->h.name, name);
647 new->h.flavour = RPC_AUTH_GSS;
648 new->pseudoflavor = pseudoflavor;
649 new->h.h.expiry_time = NEVER;
652 test = auth_domain_lookup(&new->h, 1);
653 if (test == &new->h) {
654 BUG_ON(atomic_dec_and_test(&new->h.h.refcnt));
655 } else { /* XXX Duplicate registration? */
656 auth_domain_put(&new->h);
667 EXPORT_SYMBOL(svcauth_gss_register_pseudoflavor);
670 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
675 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
682 /* It would be nice if this bit of code could be shared with the client.
684 * The client shouldn't malloc(), would have to pass in own memory.
685 * The server uses base of head iovec as read pointer, while the
686 * client uses separate pointer. */
688 unwrap_integ_data(struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
691 u32 integ_len, maj_stat;
692 struct xdr_netobj mic;
693 struct xdr_buf integ_buf;
695 integ_len = ntohl(svc_getu32(&buf->head[0]));
698 if (integ_len > buf->len)
700 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
702 /* copy out mic... */
703 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
705 if (mic.len > RPC_MAX_AUTH_SIZE)
707 mic.data = kmalloc(mic.len, GFP_KERNEL);
710 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
712 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic, NULL);
713 if (maj_stat != GSS_S_COMPLETE)
715 if (ntohl(svc_getu32(&buf->head[0])) != seq)
722 struct gss_svc_data {
723 /* decoded gss client cred: */
724 struct rpc_gss_wire_cred clcred;
725 /* pointer to the beginning of the procedure-specific results,
726 * which may be encrypted/checksummed in svcauth_gss_release: */
732 * Accept an rpcsec packet.
733 * If context establishment, punt to user space
734 * If data exchange, verify/decrypt
735 * If context destruction, handle here
736 * In the context establishment and destruction case we encode
737 * response here and return SVC_COMPLETE.
740 svcauth_gss_accept(struct svc_rqst *rqstp, u32 *authp)
742 struct iovec *argv = &rqstp->rq_arg.head[0];
743 struct iovec *resv = &rqstp->rq_res.head[0];
745 struct xdr_netobj tmpobj;
746 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
747 struct rpc_gss_wire_cred *gc;
748 struct rsc *rsci = NULL;
749 struct rsi *rsip, rsikey;
751 u32 *reject_stat = resv->iov_base + resv->iov_len;
754 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",argv->iov_len);
756 *authp = rpc_autherr_badcred;
758 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
761 rqstp->rq_auth_data = svcdata;
762 svcdata->body_start = 0;
763 svcdata->rsci = NULL;
764 gc = &svcdata->clcred;
766 /* start of rpc packet is 7 u32's back from here:
767 * xid direction rpcversion prog vers proc flavour
769 rpcstart = argv->iov_base;
773 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
774 * at least 5 u32s, and is preceeded by length, so that makes 6.
777 if (argv->iov_len < 5 * 4)
779 crlen = ntohl(svc_getu32(argv));
780 if (ntohl(svc_getu32(argv)) != RPC_GSS_VERSION)
782 gc->gc_proc = ntohl(svc_getu32(argv));
783 gc->gc_seq = ntohl(svc_getu32(argv));
784 gc->gc_svc = ntohl(svc_getu32(argv));
785 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
787 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
790 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
794 * We've successfully parsed the credential. Let's check out the
795 * verifier. An AUTH_NULL verifier is allowed (and required) for
796 * INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for
797 * PROC_DATA and PROC_DESTROY.
799 * AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length).
800 * AUTH_RPCSEC_GSS verifier is:
801 * 6 (AUTH_RPCSEC_GSS), length, checksum.
802 * checksum is calculated over rpcheader from xid up to here.
804 *authp = rpc_autherr_badverf;
805 switch (gc->gc_proc) {
806 case RPC_GSS_PROC_INIT:
807 case RPC_GSS_PROC_CONTINUE_INIT:
808 if (argv->iov_len < 2 * 4)
810 if (ntohl(svc_getu32(argv)) != RPC_AUTH_NULL)
812 if (ntohl(svc_getu32(argv)) != 0)
815 case RPC_GSS_PROC_DATA:
816 case RPC_GSS_PROC_DESTROY:
817 *authp = rpcsec_gsserr_credproblem;
818 rsci = gss_svc_searchbyctx(&gc->gc_ctx);
821 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
831 *authp = rpc_autherr_rejectedcred;
835 /* now act upon the command: */
836 switch (gc->gc_proc) {
837 case RPC_GSS_PROC_INIT:
838 case RPC_GSS_PROC_CONTINUE_INIT:
839 *authp = rpc_autherr_badcred;
840 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
842 memset(&rsikey, 0, sizeof(rsikey));
843 if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx))
845 *authp = rpc_autherr_badverf;
846 if (svc_safe_getnetobj(argv, &tmpobj)) {
847 kfree(rsikey.in_handle.data);
850 if (dup_netobj(&rsikey.in_token, &tmpobj)) {
851 kfree(rsikey.in_handle.data);
855 rsip = rsi_lookup(&rsikey, 0);
860 switch(cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) {
866 rsci = gss_svc_searchbyctx(&rsip->out_handle);
870 if (gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN))
872 if (resv->iov_len + 4 > PAGE_SIZE)
874 svc_putu32(resv, rpc_success);
875 if (svc_safe_putnetobj(resv, &rsip->out_handle))
877 if (resv->iov_len + 3 * 4 > PAGE_SIZE)
879 svc_putu32(resv, htonl(rsip->major_status));
880 svc_putu32(resv, htonl(rsip->minor_status));
881 svc_putu32(resv, htonl(GSS_SEQ_WIN));
882 if (svc_safe_putnetobj(resv, &rsip->out_token))
884 rqstp->rq_client = NULL;
887 case RPC_GSS_PROC_DESTROY:
888 set_bit(CACHE_NEGATIVE, &rsci->h.flags);
889 if (resv->iov_len + 4 > PAGE_SIZE)
891 svc_putu32(resv, rpc_success);
893 case RPC_GSS_PROC_DATA:
894 *authp = rpc_autherr_badcred;
896 find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
897 if (rqstp->rq_client == NULL)
899 *authp = rpcsec_gsserr_ctxproblem;
900 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
902 rqstp->rq_cred = rsci->cred;
903 get_group_info(rsci->cred.cr_group_info);
904 *authp = rpc_autherr_badcred;
905 switch (gc->gc_svc) {
906 case RPC_GSS_SVC_NONE:
908 case RPC_GSS_SVC_INTEGRITY:
909 if (unwrap_integ_data(&rqstp->rq_arg,
910 gc->gc_seq, rsci->mechctx))
912 svcdata->rsci = rsci;
914 /* placeholders for length and seq. number: */
915 svcdata->body_start = resv->iov_base + resv->iov_len;
919 case RPC_GSS_SVC_PRIVACY:
920 /* currently unsupported */
928 /* Restore write pointer to original value: */
929 xdr_ressize_check(rqstp, reject_stat);
939 rsc_put(&rsci->h, &rsc_cache);
944 svcauth_gss_release(struct svc_rqst *rqstp)
946 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
947 struct rpc_gss_wire_cred *gc = &gsd->clcred;
948 struct xdr_buf *resbuf = &rqstp->rq_res;
949 struct xdr_buf integ_buf;
950 struct xdr_netobj mic;
953 int integ_offset, integ_len;
956 if (gc->gc_proc != RPC_GSS_PROC_DATA)
958 /* Release can be called twice, but we only wrap once. */
959 if (gsd->body_start == 0)
961 /* normally not set till svc_send, but we need it here: */
962 resbuf->len = resbuf->head[0].iov_len
963 + resbuf->page_len + resbuf->tail[0].iov_len;
964 switch (gc->gc_svc) {
965 case RPC_GSS_SVC_NONE:
967 case RPC_GSS_SVC_INTEGRITY:
970 /* move accept_stat to right place: */
972 /* don't wrap in failure case: */
973 /* Note: counting on not getting here if call was not even
975 if (*p != rpc_success) {
976 resbuf->head[0].iov_len -= 2 * 4;
980 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
981 integ_len = resbuf->len - integ_offset;
982 BUG_ON(integ_len % 4);
983 *p++ = htonl(integ_len);
984 *p++ = htonl(gc->gc_seq);
985 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset,
988 if (resbuf->page_len == 0
989 && resbuf->tail[0].iov_len + RPC_MAX_AUTH_SIZE
991 BUG_ON(resbuf->tail[0].iov_len);
992 /* Use head for everything */
993 resv = &resbuf->head[0];
994 } else if (resbuf->tail[0].iov_base == NULL) {
995 /* copied from nfsd4_encode_read */
996 svc_take_page(rqstp);
997 resbuf->tail[0].iov_base = page_address(rqstp
998 ->rq_respages[rqstp->rq_resused-1]);
999 rqstp->rq_restailpage = rqstp->rq_resused-1;
1000 resbuf->tail[0].iov_len = 0;
1001 resv = &resbuf->tail[0];
1003 resv = &resbuf->tail[0];
1005 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1006 if (gss_get_mic(gsd->rsci->mechctx, 0, &integ_buf, &mic))
1008 svc_putu32(resv, htonl(mic.len));
1009 memset(mic.data + mic.len, 0,
1010 round_up_to_quad(mic.len) - mic.len);
1011 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1012 /* not strictly required: */
1013 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1014 BUG_ON(resv->iov_len > PAGE_SIZE);
1016 case RPC_GSS_SVC_PRIVACY:
1024 if (rqstp->rq_client)
1025 auth_domain_put(rqstp->rq_client);
1026 rqstp->rq_client = NULL;
1027 if (rqstp->rq_cred.cr_group_info)
1028 put_group_info(rqstp->rq_cred.cr_group_info);
1029 rqstp->rq_cred.cr_group_info = NULL;
1031 rsc_put(&gsd->rsci->h, &rsc_cache);
1038 svcauth_gss_domain_release(struct auth_domain *dom)
1040 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1046 struct auth_ops svcauthops_gss = {
1047 .name = "rpcsec_gss",
1048 .flavour = RPC_AUTH_GSS,
1049 .accept = svcauth_gss_accept,
1050 .release = svcauth_gss_release,
1051 .domain_release = svcauth_gss_domain_release,
1057 cache_register(&rsc_cache);
1058 cache_register(&rsi_cache);
1059 svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1064 gss_svc_shutdown(void)
1066 cache_unregister(&rsc_cache);
1067 cache_unregister(&rsi_cache);