1 // SPDX-License-Identifier: GPL-2.0
3 * Neil Brown <neilb@cse.unsw.edu.au>
4 * J. Bruce Fields <bfields@umich.edu>
5 * Andy Adamson <andros@umich.edu>
6 * Dug Song <dugsong@monkey.org>
8 * RPCSEC_GSS server authentication.
9 * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
12 * The RPCSEC_GSS involves three stages:
15 * 3/ context destruction
17 * Context creation is handled largely by upcalls to user-space.
18 * In particular, GSS_Accept_sec_context is handled by an upcall
19 * Data exchange is handled entirely within the kernel
20 * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
21 * Context destruction is handled in-kernel
22 * GSS_Delete_sec_context is in-kernel
24 * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
25 * The context handle and gss_token are used as a key into the rpcsec_init cache.
26 * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
27 * being major_status, minor_status, context_handle, reply_token.
28 * These are sent back to the client.
29 * Sequence window management is handled by the kernel. The window size if currently
30 * a compile time constant.
32 * When user-space is happy that a context is established, it places an entry
33 * in the rpcsec_context cache. The key for this cache is the context_handle.
34 * The content includes:
35 * uid/gidlist - for determining access rights
37 * mechanism specific information, such as a key
41 #include <linux/slab.h>
42 #include <linux/types.h>
43 #include <linux/module.h>
44 #include <linux/pagemap.h>
45 #include <linux/user_namespace.h>
47 #include <linux/sunrpc/auth_gss.h>
48 #include <linux/sunrpc/gss_err.h>
49 #include <linux/sunrpc/svcauth.h>
50 #include <linux/sunrpc/svcauth_gss.h>
51 #include <linux/sunrpc/cache.h>
53 #include <trace/events/rpcgss.h>
55 #include "gss_rpc_upcall.h"
58 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
61 * Key is context handle (\x if empty) and gss_token.
62 * Content is major_status minor_status (integers) context_handle, reply_token.
66 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
68 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
71 #define RSI_HASHBITS 6
72 #define RSI_HASHMAX (1<<RSI_HASHBITS)
76 struct xdr_netobj in_handle, in_token;
77 struct xdr_netobj out_handle, out_token;
78 int major_status, minor_status;
79 struct rcu_head rcu_head;
82 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
83 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
85 static void rsi_free(struct rsi *rsii)
87 kfree(rsii->in_handle.data);
88 kfree(rsii->in_token.data);
89 kfree(rsii->out_handle.data);
90 kfree(rsii->out_token.data);
93 static void rsi_free_rcu(struct rcu_head *head)
95 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
101 static void rsi_put(struct kref *ref)
103 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
105 call_rcu(&rsii->rcu_head, rsi_free_rcu);
108 static inline int rsi_hash(struct rsi *item)
110 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
111 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
114 static int rsi_match(struct cache_head *a, struct cache_head *b)
116 struct rsi *item = container_of(a, struct rsi, h);
117 struct rsi *tmp = container_of(b, struct rsi, h);
118 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
119 netobj_equal(&item->in_token, &tmp->in_token);
122 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
125 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
126 if (len && !dst->data)
131 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
133 return dup_to_netobj(dst, src->data, src->len);
136 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
138 struct rsi *new = container_of(cnew, struct rsi, h);
139 struct rsi *item = container_of(citem, struct rsi, h);
141 new->out_handle.data = NULL;
142 new->out_handle.len = 0;
143 new->out_token.data = NULL;
144 new->out_token.len = 0;
145 new->in_handle.len = item->in_handle.len;
146 item->in_handle.len = 0;
147 new->in_token.len = item->in_token.len;
148 item->in_token.len = 0;
149 new->in_handle.data = item->in_handle.data;
150 item->in_handle.data = NULL;
151 new->in_token.data = item->in_token.data;
152 item->in_token.data = NULL;
155 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
157 struct rsi *new = container_of(cnew, struct rsi, h);
158 struct rsi *item = container_of(citem, struct rsi, h);
160 BUG_ON(new->out_handle.data || new->out_token.data);
161 new->out_handle.len = item->out_handle.len;
162 item->out_handle.len = 0;
163 new->out_token.len = item->out_token.len;
164 item->out_token.len = 0;
165 new->out_handle.data = item->out_handle.data;
166 item->out_handle.data = NULL;
167 new->out_token.data = item->out_token.data;
168 item->out_token.data = NULL;
170 new->major_status = item->major_status;
171 new->minor_status = item->minor_status;
174 static struct cache_head *rsi_alloc(void)
176 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
183 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
185 return sunrpc_cache_pipe_upcall_timeout(cd, h);
188 static void rsi_request(struct cache_detail *cd,
189 struct cache_head *h,
190 char **bpp, int *blen)
192 struct rsi *rsii = container_of(h, struct rsi, h);
194 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
195 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
199 static int rsi_parse(struct cache_detail *cd,
200 char *mesg, int mlen)
202 /* context token expiry major minor context token */
206 struct rsi rsii, *rsip = NULL;
208 int status = -EINVAL;
210 memset(&rsii, 0, sizeof(rsii));
212 len = qword_get(&mesg, buf, mlen);
216 if (dup_to_netobj(&rsii.in_handle, buf, len))
220 len = qword_get(&mesg, buf, mlen);
225 if (dup_to_netobj(&rsii.in_token, buf, len))
228 rsip = rsi_lookup(cd, &rsii);
234 expiry = get_expiry(&mesg);
240 len = qword_get(&mesg, buf, mlen);
243 rsii.major_status = simple_strtoul(buf, &ep, 10);
246 len = qword_get(&mesg, buf, mlen);
249 rsii.minor_status = simple_strtoul(buf, &ep, 10);
254 len = qword_get(&mesg, buf, mlen);
258 if (dup_to_netobj(&rsii.out_handle, buf, len))
262 len = qword_get(&mesg, buf, mlen);
267 if (dup_to_netobj(&rsii.out_token, buf, len))
269 rsii.h.expiry_time = expiry;
270 rsip = rsi_update(cd, &rsii, rsip);
275 cache_put(&rsip->h, cd);
281 static const struct cache_detail rsi_cache_template = {
282 .owner = THIS_MODULE,
283 .hash_size = RSI_HASHMAX,
284 .name = "auth.rpcsec.init",
285 .cache_put = rsi_put,
286 .cache_upcall = rsi_upcall,
287 .cache_request = rsi_request,
288 .cache_parse = rsi_parse,
291 .update = update_rsi,
295 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
297 struct cache_head *ch;
298 int hash = rsi_hash(item);
300 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
302 return container_of(ch, struct rsi, h);
307 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
309 struct cache_head *ch;
310 int hash = rsi_hash(new);
312 ch = sunrpc_cache_update(cd, &new->h,
315 return container_of(ch, struct rsi, h);
322 * The rpcsec_context cache is used to store a context that is
323 * used in data exchange.
324 * The key is a context handle. The content is:
325 * uid, gidlist, mechanism, service-set, mech-specific-data
328 #define RSC_HASHBITS 10
329 #define RSC_HASHMAX (1<<RSC_HASHBITS)
331 #define GSS_SEQ_WIN 128
333 struct gss_svc_seq_data {
334 /* highest seq number seen so far: */
336 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
337 * sd_win is nonzero iff sequence number i has been seen already: */
338 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
344 struct xdr_netobj handle;
345 struct svc_cred cred;
346 struct gss_svc_seq_data seqdata;
347 struct gss_ctx *mechctx;
348 struct rcu_head rcu_head;
351 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
352 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
354 static void rsc_free(struct rsc *rsci)
356 kfree(rsci->handle.data);
358 gss_delete_sec_context(&rsci->mechctx);
359 free_svc_cred(&rsci->cred);
362 static void rsc_free_rcu(struct rcu_head *head)
364 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
366 kfree(rsci->handle.data);
370 static void rsc_put(struct kref *ref)
372 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
375 gss_delete_sec_context(&rsci->mechctx);
376 free_svc_cred(&rsci->cred);
377 call_rcu(&rsci->rcu_head, rsc_free_rcu);
381 rsc_hash(struct rsc *rsci)
383 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
387 rsc_match(struct cache_head *a, struct cache_head *b)
389 struct rsc *new = container_of(a, struct rsc, h);
390 struct rsc *tmp = container_of(b, struct rsc, h);
392 return netobj_equal(&new->handle, &tmp->handle);
396 rsc_init(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->handle.len = tmp->handle.len;
403 new->handle.data = tmp->handle.data;
404 tmp->handle.data = NULL;
406 init_svc_cred(&new->cred);
410 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
412 struct rsc *new = container_of(cnew, struct rsc, h);
413 struct rsc *tmp = container_of(ctmp, struct rsc, h);
415 new->mechctx = tmp->mechctx;
417 memset(&new->seqdata, 0, sizeof(new->seqdata));
418 spin_lock_init(&new->seqdata.sd_lock);
419 new->cred = tmp->cred;
420 init_svc_cred(&tmp->cred);
423 static struct cache_head *
426 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
433 static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
438 static int rsc_parse(struct cache_detail *cd,
439 char *mesg, int mlen)
441 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
445 struct rsc rsci, *rscp = NULL;
447 int status = -EINVAL;
448 struct gss_api_mech *gm = NULL;
450 memset(&rsci, 0, sizeof(rsci));
452 len = qword_get(&mesg, buf, mlen);
453 if (len < 0) goto out;
455 if (dup_to_netobj(&rsci.handle, buf, len))
460 expiry = get_expiry(&mesg);
465 rscp = rsc_lookup(cd, &rsci);
469 /* uid, or NEGATIVE */
470 rv = get_int(&mesg, &id);
474 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
479 * NOTE: we skip uid_valid()/gid_valid() checks here:
480 * instead, * -1 id's are later mapped to the
481 * (export-specific) anonymous id by nfsd_setuser.
483 * (But supplementary gid's get no such special
484 * treatment so are checked for validity here.)
487 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
490 if (get_int(&mesg, &id))
492 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
494 /* number of additional gid's */
495 if (get_int(&mesg, &N))
497 if (N < 0 || N > NGROUPS_MAX)
500 rsci.cred.cr_group_info = groups_alloc(N);
501 if (rsci.cred.cr_group_info == NULL)
506 for (i=0; i<N; i++) {
508 if (get_int(&mesg, &id))
510 kgid = make_kgid(current_user_ns(), id);
511 if (!gid_valid(kgid))
513 rsci.cred.cr_group_info->gid[i] = kgid;
515 groups_sort(rsci.cred.cr_group_info);
518 len = qword_get(&mesg, buf, mlen);
521 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
522 status = -EOPNOTSUPP;
527 /* mech-specific data: */
528 len = qword_get(&mesg, buf, mlen);
531 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
536 /* get client name */
537 len = qword_get(&mesg, buf, mlen);
539 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
540 if (!rsci.cred.cr_principal) {
547 rsci.h.expiry_time = expiry;
548 rscp = rsc_update(cd, &rsci, rscp);
553 cache_put(&rscp->h, cd);
559 static const struct cache_detail rsc_cache_template = {
560 .owner = THIS_MODULE,
561 .hash_size = RSC_HASHMAX,
562 .name = "auth.rpcsec.context",
563 .cache_put = rsc_put,
564 .cache_upcall = rsc_upcall,
565 .cache_parse = rsc_parse,
568 .update = update_rsc,
572 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
574 struct cache_head *ch;
575 int hash = rsc_hash(item);
577 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
579 return container_of(ch, struct rsc, h);
584 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
586 struct cache_head *ch;
587 int hash = rsc_hash(new);
589 ch = sunrpc_cache_update(cd, &new->h,
592 return container_of(ch, struct rsc, h);
599 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
604 memset(&rsci, 0, sizeof(rsci));
605 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
607 found = rsc_lookup(cd, &rsci);
611 if (cache_check(cd, &found->h, NULL))
616 /* Implements sequence number algorithm as specified in RFC 2203. */
618 gss_check_seq_num(struct rsc *rsci, int seq_num)
620 struct gss_svc_seq_data *sd = &rsci->seqdata;
622 spin_lock(&sd->sd_lock);
623 if (seq_num > sd->sd_max) {
624 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
625 memset(sd->sd_win,0,sizeof(sd->sd_win));
626 sd->sd_max = seq_num;
627 } else while (sd->sd_max < seq_num) {
629 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
631 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
633 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
636 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
637 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
640 spin_unlock(&sd->sd_lock);
643 spin_unlock(&sd->sd_lock);
647 static inline u32 round_up_to_quad(u32 i)
649 return (i + 3 ) & ~3;
653 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
657 if (argv->iov_len < 4)
659 o->len = svc_getnl(argv);
660 l = round_up_to_quad(o->len);
661 if (argv->iov_len < l)
663 o->data = argv->iov_base;
670 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
674 if (resv->iov_len + 4 > PAGE_SIZE)
676 svc_putnl(resv, o->len);
677 p = resv->iov_base + resv->iov_len;
678 resv->iov_len += round_up_to_quad(o->len);
679 if (resv->iov_len > PAGE_SIZE)
681 memcpy(p, o->data, o->len);
682 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
687 * Verify the checksum on the header and return SVC_OK on success.
688 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
689 * or return SVC_DENIED and indicate error in authp.
692 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
693 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
695 struct gss_ctx *ctx_id = rsci->mechctx;
696 struct xdr_buf rpchdr;
697 struct xdr_netobj checksum;
699 struct kvec *argv = &rqstp->rq_arg.head[0];
702 /* data to compute the checksum over: */
703 iov.iov_base = rpcstart;
704 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
705 xdr_buf_from_iov(&iov, &rpchdr);
707 *authp = rpc_autherr_badverf;
708 if (argv->iov_len < 4)
710 flavor = svc_getnl(argv);
711 if (flavor != RPC_AUTH_GSS)
713 if (svc_safe_getnetobj(argv, &checksum))
716 if (rqstp->rq_deferred) /* skip verification of revisited request */
718 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
719 *authp = rpcsec_gsserr_credproblem;
723 if (gc->gc_seq > MAXSEQ) {
724 trace_rpcgss_svc_large_seqno(rqstp->rq_xid, gc->gc_seq);
725 *authp = rpcsec_gsserr_ctxproblem;
728 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
729 trace_rpcgss_svc_old_seqno(rqstp->rq_xid, gc->gc_seq);
736 gss_write_null_verf(struct svc_rqst *rqstp)
740 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
741 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
742 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
744 if (!xdr_ressize_check(rqstp, p))
750 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
754 struct xdr_buf verf_data;
755 struct xdr_netobj mic;
760 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
761 xdr_seq = kmalloc(4, GFP_KERNEL);
764 *xdr_seq = htonl(seq);
766 iov.iov_base = xdr_seq;
768 xdr_buf_from_iov(&iov, &verf_data);
769 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
770 mic.data = (u8 *)(p + 1);
771 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
772 if (maj_stat != GSS_S_COMPLETE)
774 *p++ = htonl(mic.len);
775 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
776 p += XDR_QUADLEN(mic.len);
777 if (!xdr_ressize_check(rqstp, p))
786 struct auth_domain h;
790 static struct auth_domain *
791 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
795 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
798 return auth_domain_find(name);
801 static struct auth_ops svcauthops_gss;
803 u32 svcauth_gss_flavor(struct auth_domain *dom)
805 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
807 return gd->pseudoflavor;
810 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
813 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
815 struct gss_domain *new;
816 struct auth_domain *test;
819 new = kmalloc(sizeof(*new), GFP_KERNEL);
822 kref_init(&new->h.ref);
823 new->h.name = kstrdup(name, GFP_KERNEL);
826 new->h.flavour = &svcauthops_gss;
827 new->pseudoflavor = pseudoflavor;
830 test = auth_domain_lookup(name, &new->h);
831 if (test != &new->h) { /* Duplicate registration */
832 auth_domain_put(test);
844 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
847 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
852 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
859 /* It would be nice if this bit of code could be shared with the client.
861 * The client shouldn't malloc(), would have to pass in own memory.
862 * The server uses base of head iovec as read pointer, while the
863 * client uses separate pointer. */
865 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
868 u32 integ_len, maj_stat;
869 struct xdr_netobj mic;
870 struct xdr_buf integ_buf;
872 /* NFS READ normally uses splice to send data in-place. However
873 * the data in cache can change after the reply's MIC is computed
874 * but before the RPC reply is sent. To prevent the client from
875 * rejecting the server-computed MIC in this somewhat rare case,
876 * do not use splice with the GSS integrity service.
878 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
880 /* Did we already verify the signature on the original pass through? */
881 if (rqstp->rq_deferred)
884 integ_len = svc_getnl(&buf->head[0]);
887 if (integ_len > buf->len)
889 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) {
893 /* copy out mic... */
894 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
896 if (mic.len > RPC_MAX_AUTH_SIZE)
898 mic.data = kmalloc(mic.len, GFP_KERNEL);
901 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
903 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
904 if (maj_stat != GSS_S_COMPLETE)
906 if (svc_getnl(&buf->head[0]) != seq)
908 /* trim off the mic and padding at the end before returning */
909 buf->len -= 4 + round_up_to_quad(mic.len);
917 total_buf_len(struct xdr_buf *buf)
919 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
923 fix_priv_head(struct xdr_buf *buf, int pad)
925 if (buf->page_len == 0) {
926 /* We need to adjust head and buf->len in tandem in this
927 * case to make svc_defer() work--it finds the original
928 * buffer start using buf->len - buf->head[0].iov_len. */
929 buf->head[0].iov_len -= pad;
934 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
936 u32 priv_len, maj_stat;
937 int pad, saved_len, remaining_len, offset;
939 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
941 priv_len = svc_getnl(&buf->head[0]);
942 if (rqstp->rq_deferred) {
943 /* Already decrypted last time through! The sequence number
944 * check at out_seq is unnecessary but harmless: */
947 /* buf->len is the number of bytes from the original start of the
948 * request to the end, where head[0].iov_len is just the bytes
949 * not yet read from the head, so these two values are different: */
950 remaining_len = total_buf_len(buf);
951 if (priv_len > remaining_len)
953 pad = remaining_len - priv_len;
955 fix_priv_head(buf, pad);
957 /* Maybe it would be better to give gss_unwrap a length parameter: */
958 saved_len = buf->len;
960 maj_stat = gss_unwrap(ctx, 0, buf);
961 pad = priv_len - buf->len;
962 buf->len = saved_len;
964 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
965 * In the krb5p case, at least, the data ends up offset, so we need to
967 /* XXX: This is very inefficient. It would be better to either do
968 * this while we encrypt, or maybe in the receive code, if we can peak
969 * ahead and work out the service and mechanism there. */
970 offset = xdr_pad_size(buf->head[0].iov_len);
972 buf->buflen = RPCSVC_MAXPAYLOAD;
973 xdr_shift_buf(buf, offset);
974 fix_priv_head(buf, pad);
976 if (maj_stat != GSS_S_COMPLETE)
979 if (svc_getnl(&buf->head[0]) != seq)
984 struct gss_svc_data {
985 /* decoded gss client cred: */
986 struct rpc_gss_wire_cred clcred;
987 /* save a pointer to the beginning of the encoded verifier,
988 * for use in encryption/checksumming in svcauth_gss_release: */
994 svcauth_gss_set_client(struct svc_rqst *rqstp)
996 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
997 struct rsc *rsci = svcdata->rsci;
998 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
1002 * A gss export can be specified either by:
1003 * export *(sec=krb5,rw)
1005 * export gss/krb5(rw)
1006 * The latter is deprecated; but for backwards compatibility reasons
1007 * the nfsd code will still fall back on trying it if the former
1008 * doesn't work; so we try to make both available to nfsd, below.
1010 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1011 if (rqstp->rq_gssclient == NULL)
1013 stat = svcauth_unix_set_client(rqstp);
1014 if (stat == SVC_DROP || stat == SVC_CLOSE)
1020 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1021 struct xdr_netobj *out_handle, int *major_status)
1026 if (*major_status != GSS_S_COMPLETE)
1027 return gss_write_null_verf(rqstp);
1028 rsci = gss_svc_searchbyctx(cd, out_handle);
1030 *major_status = GSS_S_NO_CONTEXT;
1031 return gss_write_null_verf(rqstp);
1033 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1034 cache_put(&rsci->h, cd);
1039 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1040 struct kvec *argv, __be32 *authp,
1041 struct xdr_netobj *in_handle)
1043 /* Read the verifier; should be NULL: */
1044 *authp = rpc_autherr_badverf;
1045 if (argv->iov_len < 2 * 4)
1047 if (svc_getnl(argv) != RPC_AUTH_NULL)
1049 if (svc_getnl(argv) != 0)
1051 /* Martial context handle and token for upcall: */
1052 *authp = rpc_autherr_badcred;
1053 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1055 if (dup_netobj(in_handle, &gc->gc_ctx))
1057 *authp = rpc_autherr_badverf;
1063 gss_read_verf(struct rpc_gss_wire_cred *gc,
1064 struct kvec *argv, __be32 *authp,
1065 struct xdr_netobj *in_handle,
1066 struct xdr_netobj *in_token)
1068 struct xdr_netobj tmpobj;
1071 res = gss_read_common_verf(gc, argv, authp, in_handle);
1075 if (svc_safe_getnetobj(argv, &tmpobj)) {
1076 kfree(in_handle->data);
1079 if (dup_netobj(in_token, &tmpobj)) {
1080 kfree(in_handle->data);
1087 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1093 inlen = in_token->page_len;
1095 if (in_token->pages[i])
1096 put_page(in_token->pages[i]);
1097 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1100 kfree(in_token->pages);
1101 in_token->pages = NULL;
1104 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1105 struct rpc_gss_wire_cred *gc, __be32 *authp,
1106 struct xdr_netobj *in_handle,
1107 struct gssp_in_token *in_token)
1109 struct kvec *argv = &rqstp->rq_arg.head[0];
1110 unsigned int page_base, length;
1114 res = gss_read_common_verf(gc, argv, authp, in_handle);
1118 inlen = svc_getnl(argv);
1119 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1122 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1123 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1124 if (!in_token->pages)
1126 in_token->page_base = 0;
1127 in_token->page_len = inlen;
1128 for (i = 0; i < pages; i++) {
1129 in_token->pages[i] = alloc_page(GFP_KERNEL);
1130 if (!in_token->pages[i]) {
1131 gss_free_in_token_pages(in_token);
1136 length = min_t(unsigned int, inlen, argv->iov_len);
1137 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1141 page_base = rqstp->rq_arg.page_base;
1143 length = min_t(unsigned int, inlen, PAGE_SIZE);
1144 memcpy(page_address(in_token->pages[i]),
1145 page_address(rqstp->rq_arg.pages[i]) + page_base,
1156 gss_write_resv(struct kvec *resv, size_t size_limit,
1157 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1158 int major_status, int minor_status)
1160 if (resv->iov_len + 4 > size_limit)
1162 svc_putnl(resv, RPC_SUCCESS);
1163 if (svc_safe_putnetobj(resv, out_handle))
1165 if (resv->iov_len + 3 * 4 > size_limit)
1167 svc_putnl(resv, major_status);
1168 svc_putnl(resv, minor_status);
1169 svc_putnl(resv, GSS_SEQ_WIN);
1170 if (svc_safe_putnetobj(resv, out_token))
1176 * Having read the cred already and found we're in the context
1177 * initiation case, read the verifier and initiate (or check the results
1178 * of) upcalls to userspace for help with context initiation. If
1179 * the upcall results are available, write the verifier and result.
1180 * Otherwise, drop the request pending an answer to the upcall.
1182 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1183 struct rpc_gss_wire_cred *gc, __be32 *authp)
1185 struct kvec *argv = &rqstp->rq_arg.head[0];
1186 struct kvec *resv = &rqstp->rq_res.head[0];
1187 struct rsi *rsip, rsikey;
1189 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1191 memset(&rsikey, 0, sizeof(rsikey));
1192 ret = gss_read_verf(gc, argv, authp,
1193 &rsikey.in_handle, &rsikey.in_token);
1197 /* Perform upcall, or find upcall result: */
1198 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1202 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1203 /* No upcall result: */
1207 /* Got an answer to the upcall; use it: */
1208 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1209 &rsip->out_handle, &rsip->major_status))
1211 if (gss_write_resv(resv, PAGE_SIZE,
1212 &rsip->out_handle, &rsip->out_token,
1213 rsip->major_status, rsip->minor_status))
1218 cache_put(&rsip->h, sn->rsi_cache);
1222 static int gss_proxy_save_rsc(struct cache_detail *cd,
1223 struct gssp_upcall_data *ud,
1226 struct rsc rsci, *rscp = NULL;
1227 static atomic64_t ctxhctr;
1229 struct gss_api_mech *gm = NULL;
1231 int status = -EINVAL;
1233 memset(&rsci, 0, sizeof(rsci));
1234 /* context handle */
1236 /* the handle needs to be just a unique id,
1237 * use a static counter */
1238 ctxh = atomic64_inc_return(&ctxhctr);
1240 /* make a copy for the caller */
1243 /* make a copy for the rsc cache */
1244 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1246 rscp = rsc_lookup(cd, &rsci);
1251 if (!ud->found_creds) {
1252 /* userspace seem buggy, we should always get at least a
1253 * mapping to nobody */
1256 struct timespec64 boot;
1259 rsci.cred = ud->creds;
1260 memset(&ud->creds, 0, sizeof(struct svc_cred));
1262 status = -EOPNOTSUPP;
1263 /* get mech handle from OID */
1264 gm = gss_mech_get_by_OID(&ud->mech_oid);
1267 rsci.cred.cr_gss_mech = gm;
1270 /* mech-specific data: */
1271 status = gss_import_sec_context(ud->out_handle.data,
1274 &expiry, GFP_KERNEL);
1278 getboottime64(&boot);
1279 expiry -= boot.tv_sec;
1282 rsci.h.expiry_time = expiry;
1283 rscp = rsc_update(cd, &rsci, rscp);
1288 cache_put(&rscp->h, cd);
1294 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1295 struct rpc_gss_wire_cred *gc, __be32 *authp)
1297 struct kvec *resv = &rqstp->rq_res.head[0];
1298 struct xdr_netobj cli_handle;
1299 struct gssp_upcall_data ud;
1303 struct net *net = SVC_NET(rqstp);
1304 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1306 memset(&ud, 0, sizeof(ud));
1307 ret = gss_read_proxy_verf(rqstp, gc, authp,
1308 &ud.in_handle, &ud.in_token);
1314 /* Perform synchronous upcall to gss-proxy */
1315 status = gssp_accept_sec_context_upcall(net, &ud);
1319 trace_rpcgss_svc_accept_upcall(rqstp->rq_xid, ud.major_status,
1322 switch (ud.major_status) {
1323 case GSS_S_CONTINUE_NEEDED:
1324 cli_handle = ud.out_handle;
1326 case GSS_S_COMPLETE:
1327 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1330 cli_handle.data = (u8 *)&handle;
1331 cli_handle.len = sizeof(handle);
1337 /* Got an answer to the upcall; use it: */
1338 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1339 &cli_handle, &ud.major_status))
1341 if (gss_write_resv(resv, PAGE_SIZE,
1342 &cli_handle, &ud.out_token,
1343 ud.major_status, ud.minor_status))
1348 gss_free_in_token_pages(&ud.in_token);
1349 gssp_free_upcall_data(&ud);
1354 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1355 * it to be changed if it's currently undefined (-1). If it's any other value
1356 * then return -EBUSY unless the type wouldn't have changed anyway.
1358 static int set_gss_proxy(struct net *net, int type)
1360 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1363 WARN_ON_ONCE(type != 0 && type != 1);
1364 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1365 if (ret != -1 && ret != type)
1370 static bool use_gss_proxy(struct net *net)
1372 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1374 /* If use_gss_proxy is still undefined, then try to disable it */
1375 if (sn->use_gss_proxy == -1)
1376 set_gss_proxy(net, 0);
1377 return sn->use_gss_proxy;
1380 #ifdef CONFIG_PROC_FS
1382 static ssize_t write_gssp(struct file *file, const char __user *buf,
1383 size_t count, loff_t *ppos)
1385 struct net *net = PDE_DATA(file_inode(file));
1390 if (*ppos || count > sizeof(tbuf)-1)
1392 if (copy_from_user(tbuf, buf, count))
1396 res = kstrtoul(tbuf, 0, &i);
1401 res = set_gssp_clnt(net);
1404 res = set_gss_proxy(net, 1);
1410 static ssize_t read_gssp(struct file *file, char __user *buf,
1411 size_t count, loff_t *ppos)
1413 struct net *net = PDE_DATA(file_inode(file));
1414 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1415 unsigned long p = *ppos;
1419 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1426 if (copy_to_user(buf, (void *)(tbuf+p), len))
1432 static const struct proc_ops use_gss_proxy_proc_ops = {
1433 .proc_open = nonseekable_open,
1434 .proc_write = write_gssp,
1435 .proc_read = read_gssp,
1438 static int create_use_gss_proxy_proc_entry(struct net *net)
1440 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1441 struct proc_dir_entry **p = &sn->use_gssp_proc;
1443 sn->use_gss_proxy = -1;
1444 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1446 &use_gss_proxy_proc_ops, net);
1453 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1455 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1457 if (sn->use_gssp_proc) {
1458 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1459 clear_gssp_clnt(sn);
1462 #else /* CONFIG_PROC_FS */
1464 static int create_use_gss_proxy_proc_entry(struct net *net)
1469 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1471 #endif /* CONFIG_PROC_FS */
1474 * Accept an rpcsec packet.
1475 * If context establishment, punt to user space
1476 * If data exchange, verify/decrypt
1477 * If context destruction, handle here
1478 * In the context establishment and destruction case we encode
1479 * response here and return SVC_COMPLETE.
1482 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1484 struct kvec *argv = &rqstp->rq_arg.head[0];
1485 struct kvec *resv = &rqstp->rq_res.head[0];
1487 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1488 struct rpc_gss_wire_cred *gc;
1489 struct rsc *rsci = NULL;
1491 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1493 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1495 trace_rpcgss_svc_accept(rqstp->rq_xid, argv->iov_len);
1497 *authp = rpc_autherr_badcred;
1499 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1502 rqstp->rq_auth_data = svcdata;
1503 svcdata->verf_start = NULL;
1504 svcdata->rsci = NULL;
1505 gc = &svcdata->clcred;
1507 /* start of rpc packet is 7 u32's back from here:
1508 * xid direction rpcversion prog vers proc flavour
1510 rpcstart = argv->iov_base;
1514 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1515 * at least 5 u32s, and is preceded by length, so that makes 6.
1518 if (argv->iov_len < 5 * 4)
1520 crlen = svc_getnl(argv);
1521 if (svc_getnl(argv) != RPC_GSS_VERSION)
1523 gc->gc_proc = svc_getnl(argv);
1524 gc->gc_seq = svc_getnl(argv);
1525 gc->gc_svc = svc_getnl(argv);
1526 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1528 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1531 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1534 *authp = rpc_autherr_badverf;
1535 switch (gc->gc_proc) {
1536 case RPC_GSS_PROC_INIT:
1537 case RPC_GSS_PROC_CONTINUE_INIT:
1538 if (use_gss_proxy(SVC_NET(rqstp)))
1539 return svcauth_gss_proxy_init(rqstp, gc, authp);
1541 return svcauth_gss_legacy_init(rqstp, gc, authp);
1542 case RPC_GSS_PROC_DATA:
1543 case RPC_GSS_PROC_DESTROY:
1544 /* Look up the context, and check the verifier: */
1545 *authp = rpcsec_gsserr_credproblem;
1546 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1549 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1559 *authp = rpc_autherr_rejectedcred;
1563 /* now act upon the command: */
1564 switch (gc->gc_proc) {
1565 case RPC_GSS_PROC_DESTROY:
1566 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1568 /* Delete the entry from the cache_list and call cache_put */
1569 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1570 if (resv->iov_len + 4 > PAGE_SIZE)
1572 svc_putnl(resv, RPC_SUCCESS);
1574 case RPC_GSS_PROC_DATA:
1575 *authp = rpcsec_gsserr_ctxproblem;
1576 svcdata->verf_start = resv->iov_base + resv->iov_len;
1577 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1579 rqstp->rq_cred = rsci->cred;
1580 get_group_info(rsci->cred.cr_group_info);
1581 *authp = rpc_autherr_badcred;
1582 switch (gc->gc_svc) {
1583 case RPC_GSS_SVC_NONE:
1585 case RPC_GSS_SVC_INTEGRITY:
1586 /* placeholders for length and seq. number: */
1589 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1590 gc->gc_seq, rsci->mechctx))
1592 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1594 case RPC_GSS_SVC_PRIVACY:
1595 /* placeholders for length and seq. number: */
1598 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1599 gc->gc_seq, rsci->mechctx))
1601 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1606 svcdata->rsci = rsci;
1607 cache_get(&rsci->h);
1608 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1609 rsci->mechctx->mech_type,
1619 /* Restore write pointer to its original value: */
1620 xdr_ressize_check(rqstp, reject_stat);
1630 cache_put(&rsci->h, sn->rsc_cache);
1635 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1640 p = gsd->verf_start;
1641 gsd->verf_start = NULL;
1643 /* If the reply stat is nonzero, don't wrap: */
1644 if (*(p-1) != rpc_success)
1646 /* Skip the verifier: */
1648 verf_len = ntohl(*p++);
1649 p += XDR_QUADLEN(verf_len);
1650 /* move accept_stat to right place: */
1651 memcpy(p, p + 2, 4);
1652 /* Also don't wrap if the accept stat is nonzero: */
1653 if (*p != rpc_success) {
1654 resbuf->head[0].iov_len -= 2 * 4;
1662 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1664 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1665 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1666 struct xdr_buf *resbuf = &rqstp->rq_res;
1667 struct xdr_buf integ_buf;
1668 struct xdr_netobj mic;
1671 int integ_offset, integ_len;
1674 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1677 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1678 integ_len = resbuf->len - integ_offset;
1681 *p++ = htonl(integ_len);
1682 *p++ = htonl(gc->gc_seq);
1683 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1687 if (resbuf->tail[0].iov_base == NULL) {
1688 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1690 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1691 + resbuf->head[0].iov_len;
1692 resbuf->tail[0].iov_len = 0;
1694 resv = &resbuf->tail[0];
1695 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1696 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1698 svc_putnl(resv, mic.len);
1699 memset(mic.data + mic.len, 0,
1700 round_up_to_quad(mic.len) - mic.len);
1701 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1702 /* not strictly required: */
1703 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1704 if (resv->iov_len > PAGE_SIZE)
1713 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1715 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1716 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1717 struct xdr_buf *resbuf = &rqstp->rq_res;
1718 struct page **inpages = NULL;
1723 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1727 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1728 *p++ = htonl(gc->gc_seq);
1729 inpages = resbuf->pages;
1730 /* XXX: Would be better to write some xdr helper functions for
1731 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1734 * If there is currently tail data, make sure there is
1735 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1736 * the page, and move the current tail data such that
1737 * there is RPC_MAX_AUTH_SIZE slack space available in
1738 * both the head and tail.
1740 if (resbuf->tail[0].iov_base) {
1741 if (resbuf->tail[0].iov_base >=
1742 resbuf->head[0].iov_base + PAGE_SIZE)
1744 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1746 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1747 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1749 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1750 resbuf->tail[0].iov_base,
1751 resbuf->tail[0].iov_len);
1752 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1755 * If there is no current tail data, make sure there is
1756 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1757 * allotted page, and set up tail information such that there
1758 * is RPC_MAX_AUTH_SIZE slack space available in both the
1761 if (resbuf->tail[0].iov_base == NULL) {
1762 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1764 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1765 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1766 resbuf->tail[0].iov_len = 0;
1768 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1770 *len = htonl(resbuf->len - offset);
1771 pad = 3 - ((resbuf->len - offset - 1)&3);
1772 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1774 resbuf->tail[0].iov_len += pad;
1780 svcauth_gss_release(struct svc_rqst *rqstp)
1782 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1783 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1784 struct xdr_buf *resbuf = &rqstp->rq_res;
1786 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1788 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1790 /* Release can be called twice, but we only wrap once. */
1791 if (gsd->verf_start == NULL)
1793 /* normally not set till svc_send, but we need it here: */
1794 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1796 resbuf->len = total_buf_len(resbuf);
1797 switch (gc->gc_svc) {
1798 case RPC_GSS_SVC_NONE:
1800 case RPC_GSS_SVC_INTEGRITY:
1801 stat = svcauth_gss_wrap_resp_integ(rqstp);
1805 case RPC_GSS_SVC_PRIVACY:
1806 stat = svcauth_gss_wrap_resp_priv(rqstp);
1811 * For any other gc_svc value, svcauth_gss_accept() already set
1812 * the auth_error appropriately; just fall through:
1819 if (rqstp->rq_client)
1820 auth_domain_put(rqstp->rq_client);
1821 rqstp->rq_client = NULL;
1822 if (rqstp->rq_gssclient)
1823 auth_domain_put(rqstp->rq_gssclient);
1824 rqstp->rq_gssclient = NULL;
1825 if (rqstp->rq_cred.cr_group_info)
1826 put_group_info(rqstp->rq_cred.cr_group_info);
1827 rqstp->rq_cred.cr_group_info = NULL;
1829 cache_put(&gsd->rsci->h, sn->rsc_cache);
1836 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1838 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1839 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1846 svcauth_gss_domain_release(struct auth_domain *dom)
1848 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1851 static struct auth_ops svcauthops_gss = {
1852 .name = "rpcsec_gss",
1853 .owner = THIS_MODULE,
1854 .flavour = RPC_AUTH_GSS,
1855 .accept = svcauth_gss_accept,
1856 .release = svcauth_gss_release,
1857 .domain_release = svcauth_gss_domain_release,
1858 .set_client = svcauth_gss_set_client,
1861 static int rsi_cache_create_net(struct net *net)
1863 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1864 struct cache_detail *cd;
1867 cd = cache_create_net(&rsi_cache_template, net);
1870 err = cache_register_net(cd, net);
1872 cache_destroy_net(cd, net);
1879 static void rsi_cache_destroy_net(struct net *net)
1881 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1882 struct cache_detail *cd = sn->rsi_cache;
1884 sn->rsi_cache = NULL;
1886 cache_unregister_net(cd, net);
1887 cache_destroy_net(cd, net);
1890 static int rsc_cache_create_net(struct net *net)
1892 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1893 struct cache_detail *cd;
1896 cd = cache_create_net(&rsc_cache_template, net);
1899 err = cache_register_net(cd, net);
1901 cache_destroy_net(cd, net);
1908 static void rsc_cache_destroy_net(struct net *net)
1910 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1911 struct cache_detail *cd = sn->rsc_cache;
1913 sn->rsc_cache = NULL;
1915 cache_unregister_net(cd, net);
1916 cache_destroy_net(cd, net);
1920 gss_svc_init_net(struct net *net)
1924 rv = rsc_cache_create_net(net);
1927 rv = rsi_cache_create_net(net);
1930 rv = create_use_gss_proxy_proc_entry(net);
1935 destroy_use_gss_proxy_proc_entry(net);
1937 rsc_cache_destroy_net(net);
1942 gss_svc_shutdown_net(struct net *net)
1944 destroy_use_gss_proxy_proc_entry(net);
1945 rsi_cache_destroy_net(net);
1946 rsc_cache_destroy_net(net);
1952 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1956 gss_svc_shutdown(void)
1958 svc_auth_unregister(RPC_AUTH_GSS);