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 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
59 # define RPCDBG_FACILITY RPCDBG_AUTH
62 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
65 * Key is context handle (\x if empty) and gss_token.
66 * Content is major_status minor_status (integers) context_handle, reply_token.
70 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
72 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
75 #define RSI_HASHBITS 6
76 #define RSI_HASHMAX (1<<RSI_HASHBITS)
80 struct xdr_netobj in_handle, in_token;
81 struct xdr_netobj out_handle, out_token;
82 int major_status, minor_status;
83 struct rcu_head rcu_head;
86 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
87 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
89 static void rsi_free(struct rsi *rsii)
91 kfree(rsii->in_handle.data);
92 kfree(rsii->in_token.data);
93 kfree(rsii->out_handle.data);
94 kfree(rsii->out_token.data);
97 static void rsi_free_rcu(struct rcu_head *head)
99 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
105 static void rsi_put(struct kref *ref)
107 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
109 call_rcu(&rsii->rcu_head, rsi_free_rcu);
112 static inline int rsi_hash(struct rsi *item)
114 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
115 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
118 static int rsi_match(struct cache_head *a, struct cache_head *b)
120 struct rsi *item = container_of(a, struct rsi, h);
121 struct rsi *tmp = container_of(b, struct rsi, h);
122 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
123 netobj_equal(&item->in_token, &tmp->in_token);
126 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
129 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
130 if (len && !dst->data)
135 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
137 return dup_to_netobj(dst, src->data, src->len);
140 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
142 struct rsi *new = container_of(cnew, struct rsi, h);
143 struct rsi *item = container_of(citem, struct rsi, h);
145 new->out_handle.data = NULL;
146 new->out_handle.len = 0;
147 new->out_token.data = NULL;
148 new->out_token.len = 0;
149 new->in_handle.len = item->in_handle.len;
150 item->in_handle.len = 0;
151 new->in_token.len = item->in_token.len;
152 item->in_token.len = 0;
153 new->in_handle.data = item->in_handle.data;
154 item->in_handle.data = NULL;
155 new->in_token.data = item->in_token.data;
156 item->in_token.data = NULL;
159 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
161 struct rsi *new = container_of(cnew, struct rsi, h);
162 struct rsi *item = container_of(citem, struct rsi, h);
164 BUG_ON(new->out_handle.data || new->out_token.data);
165 new->out_handle.len = item->out_handle.len;
166 item->out_handle.len = 0;
167 new->out_token.len = item->out_token.len;
168 item->out_token.len = 0;
169 new->out_handle.data = item->out_handle.data;
170 item->out_handle.data = NULL;
171 new->out_token.data = item->out_token.data;
172 item->out_token.data = NULL;
174 new->major_status = item->major_status;
175 new->minor_status = item->minor_status;
178 static struct cache_head *rsi_alloc(void)
180 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
187 static void rsi_request(struct cache_detail *cd,
188 struct cache_head *h,
189 char **bpp, int *blen)
191 struct rsi *rsii = container_of(h, struct rsi, h);
193 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
194 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
198 static int rsi_parse(struct cache_detail *cd,
199 char *mesg, int mlen)
201 /* context token expiry major minor context token */
205 struct rsi rsii, *rsip = NULL;
207 int status = -EINVAL;
209 memset(&rsii, 0, sizeof(rsii));
211 len = qword_get(&mesg, buf, mlen);
215 if (dup_to_netobj(&rsii.in_handle, buf, len))
219 len = qword_get(&mesg, buf, mlen);
224 if (dup_to_netobj(&rsii.in_token, buf, len))
227 rsip = rsi_lookup(cd, &rsii);
233 expiry = get_expiry(&mesg);
239 len = qword_get(&mesg, buf, mlen);
242 rsii.major_status = simple_strtoul(buf, &ep, 10);
245 len = qword_get(&mesg, buf, mlen);
248 rsii.minor_status = simple_strtoul(buf, &ep, 10);
253 len = qword_get(&mesg, buf, mlen);
257 if (dup_to_netobj(&rsii.out_handle, buf, len))
261 len = qword_get(&mesg, buf, mlen);
266 if (dup_to_netobj(&rsii.out_token, buf, len))
268 rsii.h.expiry_time = expiry;
269 rsip = rsi_update(cd, &rsii, rsip);
274 cache_put(&rsip->h, cd);
280 static const struct cache_detail rsi_cache_template = {
281 .owner = THIS_MODULE,
282 .hash_size = RSI_HASHMAX,
283 .name = "auth.rpcsec.init",
284 .cache_put = rsi_put,
285 .cache_request = rsi_request,
286 .cache_parse = rsi_parse,
289 .update = update_rsi,
293 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
295 struct cache_head *ch;
296 int hash = rsi_hash(item);
298 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
300 return container_of(ch, struct rsi, h);
305 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
307 struct cache_head *ch;
308 int hash = rsi_hash(new);
310 ch = sunrpc_cache_update(cd, &new->h,
313 return container_of(ch, struct rsi, h);
320 * The rpcsec_context cache is used to store a context that is
321 * used in data exchange.
322 * The key is a context handle. The content is:
323 * uid, gidlist, mechanism, service-set, mech-specific-data
326 #define RSC_HASHBITS 10
327 #define RSC_HASHMAX (1<<RSC_HASHBITS)
329 #define GSS_SEQ_WIN 128
331 struct gss_svc_seq_data {
332 /* highest seq number seen so far: */
334 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
335 * sd_win is nonzero iff sequence number i has been seen already: */
336 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
342 struct xdr_netobj handle;
343 struct svc_cred cred;
344 struct gss_svc_seq_data seqdata;
345 struct gss_ctx *mechctx;
346 struct rcu_head rcu_head;
349 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
350 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
352 static void rsc_free(struct rsc *rsci)
354 kfree(rsci->handle.data);
356 gss_delete_sec_context(&rsci->mechctx);
357 free_svc_cred(&rsci->cred);
360 static void rsc_free_rcu(struct rcu_head *head)
362 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
364 kfree(rsci->handle.data);
368 static void rsc_put(struct kref *ref)
370 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
373 gss_delete_sec_context(&rsci->mechctx);
374 free_svc_cred(&rsci->cred);
375 call_rcu(&rsci->rcu_head, rsc_free_rcu);
379 rsc_hash(struct rsc *rsci)
381 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
385 rsc_match(struct cache_head *a, struct cache_head *b)
387 struct rsc *new = container_of(a, struct rsc, h);
388 struct rsc *tmp = container_of(b, struct rsc, h);
390 return netobj_equal(&new->handle, &tmp->handle);
394 rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
396 struct rsc *new = container_of(cnew, struct rsc, h);
397 struct rsc *tmp = container_of(ctmp, struct rsc, h);
399 new->handle.len = tmp->handle.len;
401 new->handle.data = tmp->handle.data;
402 tmp->handle.data = NULL;
404 init_svc_cred(&new->cred);
408 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
410 struct rsc *new = container_of(cnew, struct rsc, h);
411 struct rsc *tmp = container_of(ctmp, struct rsc, h);
413 new->mechctx = tmp->mechctx;
415 memset(&new->seqdata, 0, sizeof(new->seqdata));
416 spin_lock_init(&new->seqdata.sd_lock);
417 new->cred = tmp->cred;
418 init_svc_cred(&tmp->cred);
421 static struct cache_head *
424 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
431 static int rsc_parse(struct cache_detail *cd,
432 char *mesg, int mlen)
434 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
438 struct rsc rsci, *rscp = NULL;
440 int status = -EINVAL;
441 struct gss_api_mech *gm = NULL;
443 memset(&rsci, 0, sizeof(rsci));
445 len = qword_get(&mesg, buf, mlen);
446 if (len < 0) goto out;
448 if (dup_to_netobj(&rsci.handle, buf, len))
453 expiry = get_expiry(&mesg);
458 rscp = rsc_lookup(cd, &rsci);
462 /* uid, or NEGATIVE */
463 rv = get_int(&mesg, &id);
467 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
472 * NOTE: we skip uid_valid()/gid_valid() checks here:
473 * instead, * -1 id's are later mapped to the
474 * (export-specific) anonymous id by nfsd_setuser.
476 * (But supplementary gid's get no such special
477 * treatment so are checked for validity here.)
480 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
483 if (get_int(&mesg, &id))
485 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
487 /* number of additional gid's */
488 if (get_int(&mesg, &N))
490 if (N < 0 || N > NGROUPS_MAX)
493 rsci.cred.cr_group_info = groups_alloc(N);
494 if (rsci.cred.cr_group_info == NULL)
499 for (i=0; i<N; i++) {
501 if (get_int(&mesg, &id))
503 kgid = make_kgid(current_user_ns(), id);
504 if (!gid_valid(kgid))
506 rsci.cred.cr_group_info->gid[i] = kgid;
508 groups_sort(rsci.cred.cr_group_info);
511 len = qword_get(&mesg, buf, mlen);
514 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
515 status = -EOPNOTSUPP;
520 /* mech-specific data: */
521 len = qword_get(&mesg, buf, mlen);
524 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
529 /* get client name */
530 len = qword_get(&mesg, buf, mlen);
532 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
533 if (!rsci.cred.cr_principal) {
540 rsci.h.expiry_time = expiry;
541 rscp = rsc_update(cd, &rsci, rscp);
546 cache_put(&rscp->h, cd);
552 static const struct cache_detail rsc_cache_template = {
553 .owner = THIS_MODULE,
554 .hash_size = RSC_HASHMAX,
555 .name = "auth.rpcsec.context",
556 .cache_put = rsc_put,
557 .cache_parse = rsc_parse,
560 .update = update_rsc,
564 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
566 struct cache_head *ch;
567 int hash = rsc_hash(item);
569 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
571 return container_of(ch, struct rsc, h);
576 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
578 struct cache_head *ch;
579 int hash = rsc_hash(new);
581 ch = sunrpc_cache_update(cd, &new->h,
584 return container_of(ch, struct rsc, h);
591 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
596 memset(&rsci, 0, sizeof(rsci));
597 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
599 found = rsc_lookup(cd, &rsci);
603 if (cache_check(cd, &found->h, NULL))
608 /* Implements sequence number algorithm as specified in RFC 2203. */
610 gss_check_seq_num(struct rsc *rsci, int seq_num)
612 struct gss_svc_seq_data *sd = &rsci->seqdata;
614 spin_lock(&sd->sd_lock);
615 if (seq_num > sd->sd_max) {
616 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
617 memset(sd->sd_win,0,sizeof(sd->sd_win));
618 sd->sd_max = seq_num;
619 } else while (sd->sd_max < seq_num) {
621 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
623 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
625 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
628 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
629 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
632 spin_unlock(&sd->sd_lock);
635 spin_unlock(&sd->sd_lock);
639 static inline u32 round_up_to_quad(u32 i)
641 return (i + 3 ) & ~3;
645 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
649 if (argv->iov_len < 4)
651 o->len = svc_getnl(argv);
652 l = round_up_to_quad(o->len);
653 if (argv->iov_len < l)
655 o->data = argv->iov_base;
662 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
666 if (resv->iov_len + 4 > PAGE_SIZE)
668 svc_putnl(resv, o->len);
669 p = resv->iov_base + resv->iov_len;
670 resv->iov_len += round_up_to_quad(o->len);
671 if (resv->iov_len > PAGE_SIZE)
673 memcpy(p, o->data, o->len);
674 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
679 * Verify the checksum on the header and return SVC_OK on success.
680 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
681 * or return SVC_DENIED and indicate error in authp.
684 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
685 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
687 struct gss_ctx *ctx_id = rsci->mechctx;
688 struct xdr_buf rpchdr;
689 struct xdr_netobj checksum;
691 struct kvec *argv = &rqstp->rq_arg.head[0];
694 /* data to compute the checksum over: */
695 iov.iov_base = rpcstart;
696 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
697 xdr_buf_from_iov(&iov, &rpchdr);
699 *authp = rpc_autherr_badverf;
700 if (argv->iov_len < 4)
702 flavor = svc_getnl(argv);
703 if (flavor != RPC_AUTH_GSS)
705 if (svc_safe_getnetobj(argv, &checksum))
708 if (rqstp->rq_deferred) /* skip verification of revisited request */
710 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
711 *authp = rpcsec_gsserr_credproblem;
715 if (gc->gc_seq > MAXSEQ) {
716 dprintk("RPC: svcauth_gss: discarding request with "
717 "large sequence number %d\n", gc->gc_seq);
718 *authp = rpcsec_gsserr_ctxproblem;
721 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
722 dprintk("RPC: svcauth_gss: discarding request with "
723 "old sequence number %d\n", gc->gc_seq);
730 gss_write_null_verf(struct svc_rqst *rqstp)
734 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
735 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
736 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
738 if (!xdr_ressize_check(rqstp, p))
744 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
748 struct xdr_buf verf_data;
749 struct xdr_netobj mic;
754 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
755 xdr_seq = kmalloc(4, GFP_KERNEL);
758 *xdr_seq = htonl(seq);
760 iov.iov_base = xdr_seq;
762 xdr_buf_from_iov(&iov, &verf_data);
763 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
764 mic.data = (u8 *)(p + 1);
765 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
766 if (maj_stat != GSS_S_COMPLETE)
768 *p++ = htonl(mic.len);
769 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
770 p += XDR_QUADLEN(mic.len);
771 if (!xdr_ressize_check(rqstp, p))
780 struct auth_domain h;
784 static struct auth_domain *
785 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
789 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
792 return auth_domain_find(name);
795 static struct auth_ops svcauthops_gss;
797 u32 svcauth_gss_flavor(struct auth_domain *dom)
799 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
801 return gd->pseudoflavor;
804 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
807 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
809 struct gss_domain *new;
810 struct auth_domain *test;
813 new = kmalloc(sizeof(*new), GFP_KERNEL);
816 kref_init(&new->h.ref);
817 new->h.name = kstrdup(name, GFP_KERNEL);
820 new->h.flavour = &svcauthops_gss;
821 new->pseudoflavor = pseudoflavor;
824 test = auth_domain_lookup(name, &new->h);
825 if (test != &new->h) { /* Duplicate registration */
826 auth_domain_put(test);
838 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
841 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
846 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
853 /* It would be nice if this bit of code could be shared with the client.
855 * The client shouldn't malloc(), would have to pass in own memory.
856 * The server uses base of head iovec as read pointer, while the
857 * client uses separate pointer. */
859 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
862 u32 integ_len, maj_stat;
863 struct xdr_netobj mic;
864 struct xdr_buf integ_buf;
866 /* NFS READ normally uses splice to send data in-place. However
867 * the data in cache can change after the reply's MIC is computed
868 * but before the RPC reply is sent. To prevent the client from
869 * rejecting the server-computed MIC in this somewhat rare case,
870 * do not use splice with the GSS integrity service.
872 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
874 /* Did we already verify the signature on the original pass through? */
875 if (rqstp->rq_deferred)
878 integ_len = svc_getnl(&buf->head[0]);
881 if (integ_len > buf->len)
883 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) {
887 /* copy out mic... */
888 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
890 if (mic.len > RPC_MAX_AUTH_SIZE)
892 mic.data = kmalloc(mic.len, GFP_KERNEL);
895 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
897 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
898 if (maj_stat != GSS_S_COMPLETE)
900 if (svc_getnl(&buf->head[0]) != seq)
902 /* trim off the mic and padding at the end before returning */
903 buf->len -= 4 + round_up_to_quad(mic.len);
911 total_buf_len(struct xdr_buf *buf)
913 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
917 fix_priv_head(struct xdr_buf *buf, int pad)
919 if (buf->page_len == 0) {
920 /* We need to adjust head and buf->len in tandem in this
921 * case to make svc_defer() work--it finds the original
922 * buffer start using buf->len - buf->head[0].iov_len. */
923 buf->head[0].iov_len -= pad;
928 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
930 u32 priv_len, maj_stat;
931 int pad, saved_len, remaining_len, offset;
933 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
935 priv_len = svc_getnl(&buf->head[0]);
936 if (rqstp->rq_deferred) {
937 /* Already decrypted last time through! The sequence number
938 * check at out_seq is unnecessary but harmless: */
941 /* buf->len is the number of bytes from the original start of the
942 * request to the end, where head[0].iov_len is just the bytes
943 * not yet read from the head, so these two values are different: */
944 remaining_len = total_buf_len(buf);
945 if (priv_len > remaining_len)
947 pad = remaining_len - priv_len;
949 fix_priv_head(buf, pad);
951 /* Maybe it would be better to give gss_unwrap a length parameter: */
952 saved_len = buf->len;
954 maj_stat = gss_unwrap(ctx, 0, buf);
955 pad = priv_len - buf->len;
956 buf->len = saved_len;
958 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
959 * In the krb5p case, at least, the data ends up offset, so we need to
961 /* XXX: This is very inefficient. It would be better to either do
962 * this while we encrypt, or maybe in the receive code, if we can peak
963 * ahead and work out the service and mechanism there. */
964 offset = buf->head[0].iov_len % 4;
966 buf->buflen = RPCSVC_MAXPAYLOAD;
967 xdr_shift_buf(buf, offset);
968 fix_priv_head(buf, pad);
970 if (maj_stat != GSS_S_COMPLETE)
973 if (svc_getnl(&buf->head[0]) != seq)
978 struct gss_svc_data {
979 /* decoded gss client cred: */
980 struct rpc_gss_wire_cred clcred;
981 /* save a pointer to the beginning of the encoded verifier,
982 * for use in encryption/checksumming in svcauth_gss_release: */
988 svcauth_gss_set_client(struct svc_rqst *rqstp)
990 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
991 struct rsc *rsci = svcdata->rsci;
992 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
996 * A gss export can be specified either by:
997 * export *(sec=krb5,rw)
999 * export gss/krb5(rw)
1000 * The latter is deprecated; but for backwards compatibility reasons
1001 * the nfsd code will still fall back on trying it if the former
1002 * doesn't work; so we try to make both available to nfsd, below.
1004 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1005 if (rqstp->rq_gssclient == NULL)
1007 stat = svcauth_unix_set_client(rqstp);
1008 if (stat == SVC_DROP || stat == SVC_CLOSE)
1014 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1015 struct xdr_netobj *out_handle, int *major_status)
1020 if (*major_status != GSS_S_COMPLETE)
1021 return gss_write_null_verf(rqstp);
1022 rsci = gss_svc_searchbyctx(cd, out_handle);
1024 *major_status = GSS_S_NO_CONTEXT;
1025 return gss_write_null_verf(rqstp);
1027 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1028 cache_put(&rsci->h, cd);
1033 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1034 struct kvec *argv, __be32 *authp,
1035 struct xdr_netobj *in_handle)
1037 /* Read the verifier; should be NULL: */
1038 *authp = rpc_autherr_badverf;
1039 if (argv->iov_len < 2 * 4)
1041 if (svc_getnl(argv) != RPC_AUTH_NULL)
1043 if (svc_getnl(argv) != 0)
1045 /* Martial context handle and token for upcall: */
1046 *authp = rpc_autherr_badcred;
1047 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1049 if (dup_netobj(in_handle, &gc->gc_ctx))
1051 *authp = rpc_autherr_badverf;
1057 gss_read_verf(struct rpc_gss_wire_cred *gc,
1058 struct kvec *argv, __be32 *authp,
1059 struct xdr_netobj *in_handle,
1060 struct xdr_netobj *in_token)
1062 struct xdr_netobj tmpobj;
1065 res = gss_read_common_verf(gc, argv, authp, in_handle);
1069 if (svc_safe_getnetobj(argv, &tmpobj)) {
1070 kfree(in_handle->data);
1073 if (dup_netobj(in_token, &tmpobj)) {
1074 kfree(in_handle->data);
1081 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1087 inlen = in_token->page_len;
1089 if (in_token->pages[i])
1090 put_page(in_token->pages[i]);
1091 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1094 kfree(in_token->pages);
1095 in_token->pages = NULL;
1098 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1099 struct rpc_gss_wire_cred *gc, __be32 *authp,
1100 struct xdr_netobj *in_handle,
1101 struct gssp_in_token *in_token)
1103 struct kvec *argv = &rqstp->rq_arg.head[0];
1104 unsigned int page_base, length;
1108 res = gss_read_common_verf(gc, argv, authp, in_handle);
1112 inlen = svc_getnl(argv);
1113 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1116 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1117 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1118 if (!in_token->pages)
1120 in_token->page_base = 0;
1121 in_token->page_len = inlen;
1122 for (i = 0; i < pages; i++) {
1123 in_token->pages[i] = alloc_page(GFP_KERNEL);
1124 if (!in_token->pages[i]) {
1125 gss_free_in_token_pages(in_token);
1130 length = min_t(unsigned int, inlen, argv->iov_len);
1131 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1135 page_base = rqstp->rq_arg.page_base;
1137 length = min_t(unsigned int, inlen, PAGE_SIZE);
1138 memcpy(page_address(in_token->pages[i]),
1139 page_address(rqstp->rq_arg.pages[i]) + page_base,
1150 gss_write_resv(struct kvec *resv, size_t size_limit,
1151 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1152 int major_status, int minor_status)
1154 if (resv->iov_len + 4 > size_limit)
1156 svc_putnl(resv, RPC_SUCCESS);
1157 if (svc_safe_putnetobj(resv, out_handle))
1159 if (resv->iov_len + 3 * 4 > size_limit)
1161 svc_putnl(resv, major_status);
1162 svc_putnl(resv, minor_status);
1163 svc_putnl(resv, GSS_SEQ_WIN);
1164 if (svc_safe_putnetobj(resv, out_token))
1170 * Having read the cred already and found we're in the context
1171 * initiation case, read the verifier and initiate (or check the results
1172 * of) upcalls to userspace for help with context initiation. If
1173 * the upcall results are available, write the verifier and result.
1174 * Otherwise, drop the request pending an answer to the upcall.
1176 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1177 struct rpc_gss_wire_cred *gc, __be32 *authp)
1179 struct kvec *argv = &rqstp->rq_arg.head[0];
1180 struct kvec *resv = &rqstp->rq_res.head[0];
1181 struct rsi *rsip, rsikey;
1183 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1185 memset(&rsikey, 0, sizeof(rsikey));
1186 ret = gss_read_verf(gc, argv, authp,
1187 &rsikey.in_handle, &rsikey.in_token);
1191 /* Perform upcall, or find upcall result: */
1192 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1196 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1197 /* No upcall result: */
1201 /* Got an answer to the upcall; use it: */
1202 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1203 &rsip->out_handle, &rsip->major_status))
1205 if (gss_write_resv(resv, PAGE_SIZE,
1206 &rsip->out_handle, &rsip->out_token,
1207 rsip->major_status, rsip->minor_status))
1212 cache_put(&rsip->h, sn->rsi_cache);
1216 static int gss_proxy_save_rsc(struct cache_detail *cd,
1217 struct gssp_upcall_data *ud,
1220 struct rsc rsci, *rscp = NULL;
1221 static atomic64_t ctxhctr;
1223 struct gss_api_mech *gm = NULL;
1225 int status = -EINVAL;
1227 memset(&rsci, 0, sizeof(rsci));
1228 /* context handle */
1230 /* the handle needs to be just a unique id,
1231 * use a static counter */
1232 ctxh = atomic64_inc_return(&ctxhctr);
1234 /* make a copy for the caller */
1237 /* make a copy for the rsc cache */
1238 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1240 rscp = rsc_lookup(cd, &rsci);
1245 if (!ud->found_creds) {
1246 /* userspace seem buggy, we should always get at least a
1247 * mapping to nobody */
1248 dprintk("RPC: No creds found!\n");
1253 rsci.cred = ud->creds;
1254 memset(&ud->creds, 0, sizeof(struct svc_cred));
1256 status = -EOPNOTSUPP;
1257 /* get mech handle from OID */
1258 gm = gss_mech_get_by_OID(&ud->mech_oid);
1261 rsci.cred.cr_gss_mech = gm;
1264 /* mech-specific data: */
1265 status = gss_import_sec_context(ud->out_handle.data,
1268 &expiry, GFP_KERNEL);
1273 rsci.h.expiry_time = expiry;
1274 rscp = rsc_update(cd, &rsci, rscp);
1279 cache_put(&rscp->h, cd);
1285 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1286 struct rpc_gss_wire_cred *gc, __be32 *authp)
1288 struct kvec *resv = &rqstp->rq_res.head[0];
1289 struct xdr_netobj cli_handle;
1290 struct gssp_upcall_data ud;
1294 struct net *net = SVC_NET(rqstp);
1295 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1297 memset(&ud, 0, sizeof(ud));
1298 ret = gss_read_proxy_verf(rqstp, gc, authp,
1299 &ud.in_handle, &ud.in_token);
1305 /* Perform synchronous upcall to gss-proxy */
1306 status = gssp_accept_sec_context_upcall(net, &ud);
1310 trace_rpcgss_accept_upcall(rqstp->rq_xid, ud.major_status,
1313 switch (ud.major_status) {
1314 case GSS_S_CONTINUE_NEEDED:
1315 cli_handle = ud.out_handle;
1317 case GSS_S_COMPLETE:
1318 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1320 pr_info("%s: gss_proxy_save_rsc failed (%d)\n",
1324 cli_handle.data = (u8 *)&handle;
1325 cli_handle.len = sizeof(handle);
1332 /* Got an answer to the upcall; use it: */
1333 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1334 &cli_handle, &ud.major_status)) {
1335 pr_info("%s: gss_write_init_verf failed\n", __func__);
1338 if (gss_write_resv(resv, PAGE_SIZE,
1339 &cli_handle, &ud.out_token,
1340 ud.major_status, ud.minor_status)) {
1341 pr_info("%s: gss_write_resv failed\n", __func__);
1347 gss_free_in_token_pages(&ud.in_token);
1348 gssp_free_upcall_data(&ud);
1353 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1354 * it to be changed if it's currently undefined (-1). If it's any other value
1355 * then return -EBUSY unless the type wouldn't have changed anyway.
1357 static int set_gss_proxy(struct net *net, int type)
1359 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1362 WARN_ON_ONCE(type != 0 && type != 1);
1363 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1364 if (ret != -1 && ret != type)
1369 static bool use_gss_proxy(struct net *net)
1371 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1373 /* If use_gss_proxy is still undefined, then try to disable it */
1374 if (sn->use_gss_proxy == -1)
1375 set_gss_proxy(net, 0);
1376 return sn->use_gss_proxy;
1379 #ifdef CONFIG_PROC_FS
1381 static ssize_t write_gssp(struct file *file, const char __user *buf,
1382 size_t count, loff_t *ppos)
1384 struct net *net = PDE_DATA(file_inode(file));
1389 if (*ppos || count > sizeof(tbuf)-1)
1391 if (copy_from_user(tbuf, buf, count))
1395 res = kstrtoul(tbuf, 0, &i);
1400 res = set_gssp_clnt(net);
1403 res = set_gss_proxy(net, 1);
1409 static ssize_t read_gssp(struct file *file, char __user *buf,
1410 size_t count, loff_t *ppos)
1412 struct net *net = PDE_DATA(file_inode(file));
1413 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1414 unsigned long p = *ppos;
1418 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1425 if (copy_to_user(buf, (void *)(tbuf+p), len))
1431 static const struct file_operations use_gss_proxy_ops = {
1432 .open = nonseekable_open,
1433 .write = write_gssp,
1437 static int create_use_gss_proxy_proc_entry(struct net *net)
1439 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1440 struct proc_dir_entry **p = &sn->use_gssp_proc;
1442 sn->use_gss_proxy = -1;
1443 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1445 &use_gss_proxy_ops, net);
1452 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1454 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1456 if (sn->use_gssp_proc) {
1457 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1458 clear_gssp_clnt(sn);
1461 #else /* CONFIG_PROC_FS */
1463 static int create_use_gss_proxy_proc_entry(struct net *net)
1468 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1470 #endif /* CONFIG_PROC_FS */
1473 * Accept an rpcsec packet.
1474 * If context establishment, punt to user space
1475 * If data exchange, verify/decrypt
1476 * If context destruction, handle here
1477 * In the context establishment and destruction case we encode
1478 * response here and return SVC_COMPLETE.
1481 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1483 struct kvec *argv = &rqstp->rq_arg.head[0];
1484 struct kvec *resv = &rqstp->rq_res.head[0];
1486 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1487 struct rpc_gss_wire_cred *gc;
1488 struct rsc *rsci = NULL;
1490 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1492 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1494 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",
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;
1679 BUG_ON(integ_len % 4);
1680 *p++ = htonl(integ_len);
1681 *p++ = htonl(gc->gc_seq);
1682 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1686 if (resbuf->tail[0].iov_base == NULL) {
1687 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1689 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1690 + resbuf->head[0].iov_len;
1691 resbuf->tail[0].iov_len = 0;
1693 resv = &resbuf->tail[0];
1694 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1695 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1697 svc_putnl(resv, mic.len);
1698 memset(mic.data + mic.len, 0,
1699 round_up_to_quad(mic.len) - mic.len);
1700 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1701 /* not strictly required: */
1702 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1703 BUG_ON(resv->iov_len > PAGE_SIZE);
1711 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1713 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1714 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1715 struct xdr_buf *resbuf = &rqstp->rq_res;
1716 struct page **inpages = NULL;
1721 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1725 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1726 *p++ = htonl(gc->gc_seq);
1727 inpages = resbuf->pages;
1728 /* XXX: Would be better to write some xdr helper functions for
1729 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1732 * If there is currently tail data, make sure there is
1733 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1734 * the page, and move the current tail data such that
1735 * there is RPC_MAX_AUTH_SIZE slack space available in
1736 * both the head and tail.
1738 if (resbuf->tail[0].iov_base) {
1739 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
1741 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
1742 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1743 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1745 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1746 resbuf->tail[0].iov_base,
1747 resbuf->tail[0].iov_len);
1748 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1751 * If there is no current tail data, make sure there is
1752 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1753 * allotted page, and set up tail information such that there
1754 * is RPC_MAX_AUTH_SIZE slack space available in both the
1757 if (resbuf->tail[0].iov_base == NULL) {
1758 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1760 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1761 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1762 resbuf->tail[0].iov_len = 0;
1764 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1766 *len = htonl(resbuf->len - offset);
1767 pad = 3 - ((resbuf->len - offset - 1)&3);
1768 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1770 resbuf->tail[0].iov_len += pad;
1776 svcauth_gss_release(struct svc_rqst *rqstp)
1778 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1779 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1780 struct xdr_buf *resbuf = &rqstp->rq_res;
1782 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1784 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1786 /* Release can be called twice, but we only wrap once. */
1787 if (gsd->verf_start == NULL)
1789 /* normally not set till svc_send, but we need it here: */
1790 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1792 resbuf->len = total_buf_len(resbuf);
1793 switch (gc->gc_svc) {
1794 case RPC_GSS_SVC_NONE:
1796 case RPC_GSS_SVC_INTEGRITY:
1797 stat = svcauth_gss_wrap_resp_integ(rqstp);
1801 case RPC_GSS_SVC_PRIVACY:
1802 stat = svcauth_gss_wrap_resp_priv(rqstp);
1807 * For any other gc_svc value, svcauth_gss_accept() already set
1808 * the auth_error appropriately; just fall through:
1815 if (rqstp->rq_client)
1816 auth_domain_put(rqstp->rq_client);
1817 rqstp->rq_client = NULL;
1818 if (rqstp->rq_gssclient)
1819 auth_domain_put(rqstp->rq_gssclient);
1820 rqstp->rq_gssclient = NULL;
1821 if (rqstp->rq_cred.cr_group_info)
1822 put_group_info(rqstp->rq_cred.cr_group_info);
1823 rqstp->rq_cred.cr_group_info = NULL;
1825 cache_put(&gsd->rsci->h, sn->rsc_cache);
1832 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1834 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1835 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1842 svcauth_gss_domain_release(struct auth_domain *dom)
1844 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1847 static struct auth_ops svcauthops_gss = {
1848 .name = "rpcsec_gss",
1849 .owner = THIS_MODULE,
1850 .flavour = RPC_AUTH_GSS,
1851 .accept = svcauth_gss_accept,
1852 .release = svcauth_gss_release,
1853 .domain_release = svcauth_gss_domain_release,
1854 .set_client = svcauth_gss_set_client,
1857 static int rsi_cache_create_net(struct net *net)
1859 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1860 struct cache_detail *cd;
1863 cd = cache_create_net(&rsi_cache_template, net);
1866 err = cache_register_net(cd, net);
1868 cache_destroy_net(cd, net);
1875 static void rsi_cache_destroy_net(struct net *net)
1877 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1878 struct cache_detail *cd = sn->rsi_cache;
1880 sn->rsi_cache = NULL;
1882 cache_unregister_net(cd, net);
1883 cache_destroy_net(cd, net);
1886 static int rsc_cache_create_net(struct net *net)
1888 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1889 struct cache_detail *cd;
1892 cd = cache_create_net(&rsc_cache_template, net);
1895 err = cache_register_net(cd, net);
1897 cache_destroy_net(cd, net);
1904 static void rsc_cache_destroy_net(struct net *net)
1906 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1907 struct cache_detail *cd = sn->rsc_cache;
1909 sn->rsc_cache = NULL;
1911 cache_unregister_net(cd, net);
1912 cache_destroy_net(cd, net);
1916 gss_svc_init_net(struct net *net)
1920 rv = rsc_cache_create_net(net);
1923 rv = rsi_cache_create_net(net);
1926 rv = create_use_gss_proxy_proc_entry(net);
1931 destroy_use_gss_proxy_proc_entry(net);
1933 rsc_cache_destroy_net(net);
1938 gss_svc_shutdown_net(struct net *net)
1940 destroy_use_gss_proxy_proc_entry(net);
1941 rsi_cache_destroy_net(net);
1942 rsc_cache_destroy_net(net);
1948 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1952 gss_svc_shutdown(void)
1954 svc_auth_unregister(RPC_AUTH_GSS);