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>
52 #include "gss_rpc_upcall.h"
55 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
56 # define RPCDBG_FACILITY RPCDBG_AUTH
59 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
62 * Key is context handle (\x if empty) and gss_token.
63 * Content is major_status minor_status (integers) context_handle, reply_token.
67 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
69 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
72 #define RSI_HASHBITS 6
73 #define RSI_HASHMAX (1<<RSI_HASHBITS)
77 struct xdr_netobj in_handle, in_token;
78 struct xdr_netobj out_handle, out_token;
79 int major_status, minor_status;
80 struct rcu_head rcu_head;
83 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
84 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
86 static void rsi_free(struct rsi *rsii)
88 kfree(rsii->in_handle.data);
89 kfree(rsii->in_token.data);
90 kfree(rsii->out_handle.data);
91 kfree(rsii->out_token.data);
94 static void rsi_free_rcu(struct rcu_head *head)
96 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
102 static void rsi_put(struct kref *ref)
104 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
106 call_rcu(&rsii->rcu_head, rsi_free_rcu);
109 static inline int rsi_hash(struct rsi *item)
111 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
112 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
115 static int rsi_match(struct cache_head *a, struct cache_head *b)
117 struct rsi *item = container_of(a, struct rsi, h);
118 struct rsi *tmp = container_of(b, struct rsi, h);
119 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
120 netobj_equal(&item->in_token, &tmp->in_token);
123 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
126 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
127 if (len && !dst->data)
132 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
134 return dup_to_netobj(dst, src->data, src->len);
137 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
139 struct rsi *new = container_of(cnew, struct rsi, h);
140 struct rsi *item = container_of(citem, struct rsi, h);
142 new->out_handle.data = NULL;
143 new->out_handle.len = 0;
144 new->out_token.data = NULL;
145 new->out_token.len = 0;
146 new->in_handle.len = item->in_handle.len;
147 item->in_handle.len = 0;
148 new->in_token.len = item->in_token.len;
149 item->in_token.len = 0;
150 new->in_handle.data = item->in_handle.data;
151 item->in_handle.data = NULL;
152 new->in_token.data = item->in_token.data;
153 item->in_token.data = NULL;
156 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
158 struct rsi *new = container_of(cnew, struct rsi, h);
159 struct rsi *item = container_of(citem, struct rsi, h);
161 BUG_ON(new->out_handle.data || new->out_token.data);
162 new->out_handle.len = item->out_handle.len;
163 item->out_handle.len = 0;
164 new->out_token.len = item->out_token.len;
165 item->out_token.len = 0;
166 new->out_handle.data = item->out_handle.data;
167 item->out_handle.data = NULL;
168 new->out_token.data = item->out_token.data;
169 item->out_token.data = NULL;
171 new->major_status = item->major_status;
172 new->minor_status = item->minor_status;
175 static struct cache_head *rsi_alloc(void)
177 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
184 static void rsi_request(struct cache_detail *cd,
185 struct cache_head *h,
186 char **bpp, int *blen)
188 struct rsi *rsii = container_of(h, struct rsi, h);
190 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
191 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
195 static int rsi_parse(struct cache_detail *cd,
196 char *mesg, int mlen)
198 /* context token expiry major minor context token */
202 struct rsi rsii, *rsip = NULL;
204 int status = -EINVAL;
206 memset(&rsii, 0, sizeof(rsii));
208 len = qword_get(&mesg, buf, mlen);
212 if (dup_to_netobj(&rsii.in_handle, buf, len))
216 len = qword_get(&mesg, buf, mlen);
221 if (dup_to_netobj(&rsii.in_token, buf, len))
224 rsip = rsi_lookup(cd, &rsii);
230 expiry = get_expiry(&mesg);
236 len = qword_get(&mesg, buf, mlen);
239 rsii.major_status = simple_strtoul(buf, &ep, 10);
242 len = qword_get(&mesg, buf, mlen);
245 rsii.minor_status = simple_strtoul(buf, &ep, 10);
250 len = qword_get(&mesg, buf, mlen);
254 if (dup_to_netobj(&rsii.out_handle, buf, len))
258 len = qword_get(&mesg, buf, mlen);
263 if (dup_to_netobj(&rsii.out_token, buf, len))
265 rsii.h.expiry_time = expiry;
266 rsip = rsi_update(cd, &rsii, rsip);
271 cache_put(&rsip->h, cd);
277 static const struct cache_detail rsi_cache_template = {
278 .owner = THIS_MODULE,
279 .hash_size = RSI_HASHMAX,
280 .name = "auth.rpcsec.init",
281 .cache_put = rsi_put,
282 .cache_request = rsi_request,
283 .cache_parse = rsi_parse,
286 .update = update_rsi,
290 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
292 struct cache_head *ch;
293 int hash = rsi_hash(item);
295 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
297 return container_of(ch, struct rsi, h);
302 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
304 struct cache_head *ch;
305 int hash = rsi_hash(new);
307 ch = sunrpc_cache_update(cd, &new->h,
310 return container_of(ch, struct rsi, h);
317 * The rpcsec_context cache is used to store a context that is
318 * used in data exchange.
319 * The key is a context handle. The content is:
320 * uid, gidlist, mechanism, service-set, mech-specific-data
323 #define RSC_HASHBITS 10
324 #define RSC_HASHMAX (1<<RSC_HASHBITS)
326 #define GSS_SEQ_WIN 128
328 struct gss_svc_seq_data {
329 /* highest seq number seen so far: */
331 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
332 * sd_win is nonzero iff sequence number i has been seen already: */
333 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
339 struct xdr_netobj handle;
340 struct svc_cred cred;
341 struct gss_svc_seq_data seqdata;
342 struct gss_ctx *mechctx;
343 struct rcu_head rcu_head;
346 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
347 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
349 static void rsc_free(struct rsc *rsci)
351 kfree(rsci->handle.data);
353 gss_delete_sec_context(&rsci->mechctx);
354 free_svc_cred(&rsci->cred);
357 static void rsc_free_rcu(struct rcu_head *head)
359 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
361 kfree(rsci->handle.data);
365 static void rsc_put(struct kref *ref)
367 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
370 gss_delete_sec_context(&rsci->mechctx);
371 free_svc_cred(&rsci->cred);
372 call_rcu(&rsci->rcu_head, rsc_free_rcu);
376 rsc_hash(struct rsc *rsci)
378 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
382 rsc_match(struct cache_head *a, struct cache_head *b)
384 struct rsc *new = container_of(a, struct rsc, h);
385 struct rsc *tmp = container_of(b, struct rsc, h);
387 return netobj_equal(&new->handle, &tmp->handle);
391 rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
393 struct rsc *new = container_of(cnew, struct rsc, h);
394 struct rsc *tmp = container_of(ctmp, struct rsc, h);
396 new->handle.len = tmp->handle.len;
398 new->handle.data = tmp->handle.data;
399 tmp->handle.data = NULL;
401 init_svc_cred(&new->cred);
405 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
407 struct rsc *new = container_of(cnew, struct rsc, h);
408 struct rsc *tmp = container_of(ctmp, struct rsc, h);
410 new->mechctx = tmp->mechctx;
412 memset(&new->seqdata, 0, sizeof(new->seqdata));
413 spin_lock_init(&new->seqdata.sd_lock);
414 new->cred = tmp->cred;
415 init_svc_cred(&tmp->cred);
418 static struct cache_head *
421 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
428 static int rsc_parse(struct cache_detail *cd,
429 char *mesg, int mlen)
431 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
435 struct rsc rsci, *rscp = NULL;
437 int status = -EINVAL;
438 struct gss_api_mech *gm = NULL;
440 memset(&rsci, 0, sizeof(rsci));
442 len = qword_get(&mesg, buf, mlen);
443 if (len < 0) goto out;
445 if (dup_to_netobj(&rsci.handle, buf, len))
450 expiry = get_expiry(&mesg);
455 rscp = rsc_lookup(cd, &rsci);
459 /* uid, or NEGATIVE */
460 rv = get_int(&mesg, &id);
464 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
469 * NOTE: we skip uid_valid()/gid_valid() checks here:
470 * instead, * -1 id's are later mapped to the
471 * (export-specific) anonymous id by nfsd_setuser.
473 * (But supplementary gid's get no such special
474 * treatment so are checked for validity here.)
477 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
480 if (get_int(&mesg, &id))
482 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
484 /* number of additional gid's */
485 if (get_int(&mesg, &N))
487 if (N < 0 || N > NGROUPS_MAX)
490 rsci.cred.cr_group_info = groups_alloc(N);
491 if (rsci.cred.cr_group_info == NULL)
496 for (i=0; i<N; i++) {
498 if (get_int(&mesg, &id))
500 kgid = make_kgid(current_user_ns(), id);
501 if (!gid_valid(kgid))
503 rsci.cred.cr_group_info->gid[i] = kgid;
505 groups_sort(rsci.cred.cr_group_info);
508 len = qword_get(&mesg, buf, mlen);
511 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
512 status = -EOPNOTSUPP;
517 /* mech-specific data: */
518 len = qword_get(&mesg, buf, mlen);
521 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
526 /* get client name */
527 len = qword_get(&mesg, buf, mlen);
529 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
530 if (!rsci.cred.cr_principal) {
537 rsci.h.expiry_time = expiry;
538 rscp = rsc_update(cd, &rsci, rscp);
543 cache_put(&rscp->h, cd);
549 static const struct cache_detail rsc_cache_template = {
550 .owner = THIS_MODULE,
551 .hash_size = RSC_HASHMAX,
552 .name = "auth.rpcsec.context",
553 .cache_put = rsc_put,
554 .cache_parse = rsc_parse,
557 .update = update_rsc,
561 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
563 struct cache_head *ch;
564 int hash = rsc_hash(item);
566 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
568 return container_of(ch, struct rsc, h);
573 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
575 struct cache_head *ch;
576 int hash = rsc_hash(new);
578 ch = sunrpc_cache_update(cd, &new->h,
581 return container_of(ch, struct rsc, h);
588 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
593 memset(&rsci, 0, sizeof(rsci));
594 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
596 found = rsc_lookup(cd, &rsci);
600 if (cache_check(cd, &found->h, NULL))
605 /* Implements sequence number algorithm as specified in RFC 2203. */
607 gss_check_seq_num(struct rsc *rsci, int seq_num)
609 struct gss_svc_seq_data *sd = &rsci->seqdata;
611 spin_lock(&sd->sd_lock);
612 if (seq_num > sd->sd_max) {
613 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
614 memset(sd->sd_win,0,sizeof(sd->sd_win));
615 sd->sd_max = seq_num;
616 } else while (sd->sd_max < seq_num) {
618 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
620 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
622 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
625 /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
626 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
629 spin_unlock(&sd->sd_lock);
632 spin_unlock(&sd->sd_lock);
636 static inline u32 round_up_to_quad(u32 i)
638 return (i + 3 ) & ~3;
642 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
646 if (argv->iov_len < 4)
648 o->len = svc_getnl(argv);
649 l = round_up_to_quad(o->len);
650 if (argv->iov_len < l)
652 o->data = argv->iov_base;
659 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
663 if (resv->iov_len + 4 > PAGE_SIZE)
665 svc_putnl(resv, o->len);
666 p = resv->iov_base + resv->iov_len;
667 resv->iov_len += round_up_to_quad(o->len);
668 if (resv->iov_len > PAGE_SIZE)
670 memcpy(p, o->data, o->len);
671 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
676 * Verify the checksum on the header and return SVC_OK on success.
677 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
678 * or return SVC_DENIED and indicate error in authp.
681 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
682 __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
684 struct gss_ctx *ctx_id = rsci->mechctx;
685 struct xdr_buf rpchdr;
686 struct xdr_netobj checksum;
688 struct kvec *argv = &rqstp->rq_arg.head[0];
691 /* data to compute the checksum over: */
692 iov.iov_base = rpcstart;
693 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
694 xdr_buf_from_iov(&iov, &rpchdr);
696 *authp = rpc_autherr_badverf;
697 if (argv->iov_len < 4)
699 flavor = svc_getnl(argv);
700 if (flavor != RPC_AUTH_GSS)
702 if (svc_safe_getnetobj(argv, &checksum))
705 if (rqstp->rq_deferred) /* skip verification of revisited request */
707 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
708 *authp = rpcsec_gsserr_credproblem;
712 if (gc->gc_seq > MAXSEQ) {
713 dprintk("RPC: svcauth_gss: discarding request with "
714 "large sequence number %d\n", gc->gc_seq);
715 *authp = rpcsec_gsserr_ctxproblem;
718 if (!gss_check_seq_num(rsci, gc->gc_seq)) {
719 dprintk("RPC: svcauth_gss: discarding request with "
720 "old sequence number %d\n", gc->gc_seq);
727 gss_write_null_verf(struct svc_rqst *rqstp)
731 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
732 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
733 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
735 if (!xdr_ressize_check(rqstp, p))
741 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
745 struct xdr_buf verf_data;
746 struct xdr_netobj mic;
751 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
752 xdr_seq = kmalloc(4, GFP_KERNEL);
755 *xdr_seq = htonl(seq);
757 iov.iov_base = xdr_seq;
759 xdr_buf_from_iov(&iov, &verf_data);
760 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
761 mic.data = (u8 *)(p + 1);
762 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
763 if (maj_stat != GSS_S_COMPLETE)
765 *p++ = htonl(mic.len);
766 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
767 p += XDR_QUADLEN(mic.len);
768 if (!xdr_ressize_check(rqstp, p))
777 struct auth_domain h;
781 static struct auth_domain *
782 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
786 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
789 return auth_domain_find(name);
792 static struct auth_ops svcauthops_gss;
794 u32 svcauth_gss_flavor(struct auth_domain *dom)
796 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
798 return gd->pseudoflavor;
801 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
804 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
806 struct gss_domain *new;
807 struct auth_domain *test;
810 new = kmalloc(sizeof(*new), GFP_KERNEL);
813 kref_init(&new->h.ref);
814 new->h.name = kstrdup(name, GFP_KERNEL);
817 new->h.flavour = &svcauthops_gss;
818 new->pseudoflavor = pseudoflavor;
820 test = auth_domain_lookup(name, &new->h);
821 if (test != &new->h) {
822 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
825 auth_domain_put(test);
835 return ERR_PTR(stat);
837 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
840 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
845 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
852 /* It would be nice if this bit of code could be shared with the client.
854 * The client shouldn't malloc(), would have to pass in own memory.
855 * The server uses base of head iovec as read pointer, while the
856 * client uses separate pointer. */
858 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
861 u32 integ_len, maj_stat;
862 struct xdr_netobj mic;
863 struct xdr_buf integ_buf;
865 /* NFS READ normally uses splice to send data in-place. However
866 * the data in cache can change after the reply's MIC is computed
867 * but before the RPC reply is sent. To prevent the client from
868 * rejecting the server-computed MIC in this somewhat rare case,
869 * do not use splice with the GSS integrity service.
871 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
873 /* Did we already verify the signature on the original pass through? */
874 if (rqstp->rq_deferred)
877 integ_len = svc_getnl(&buf->head[0]);
880 if (integ_len > buf->len)
882 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) {
886 /* copy out mic... */
887 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
889 if (mic.len > RPC_MAX_AUTH_SIZE)
891 mic.data = kmalloc(mic.len, GFP_KERNEL);
894 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
896 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
897 if (maj_stat != GSS_S_COMPLETE)
899 if (svc_getnl(&buf->head[0]) != seq)
901 /* trim off the mic and padding at the end before returning */
902 xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
910 total_buf_len(struct xdr_buf *buf)
912 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
916 fix_priv_head(struct xdr_buf *buf, int pad)
918 if (buf->page_len == 0) {
919 /* We need to adjust head and buf->len in tandem in this
920 * case to make svc_defer() work--it finds the original
921 * buffer start using buf->len - buf->head[0].iov_len. */
922 buf->head[0].iov_len -= pad;
927 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
929 u32 priv_len, maj_stat;
930 int pad, remaining_len, offset;
932 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
934 priv_len = svc_getnl(&buf->head[0]);
935 if (rqstp->rq_deferred) {
936 /* Already decrypted last time through! The sequence number
937 * check at out_seq is unnecessary but harmless: */
940 /* buf->len is the number of bytes from the original start of the
941 * request to the end, where head[0].iov_len is just the bytes
942 * not yet read from the head, so these two values are different: */
943 remaining_len = total_buf_len(buf);
944 if (priv_len > remaining_len)
946 pad = remaining_len - priv_len;
948 fix_priv_head(buf, pad);
950 maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
951 pad = priv_len - buf->len;
952 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
953 * In the krb5p case, at least, the data ends up offset, so we need to
955 /* XXX: This is very inefficient. It would be better to either do
956 * this while we encrypt, or maybe in the receive code, if we can peak
957 * ahead and work out the service and mechanism there. */
958 offset = buf->head[0].iov_len % 4;
960 buf->buflen = RPCSVC_MAXPAYLOAD;
961 xdr_shift_buf(buf, offset);
962 fix_priv_head(buf, pad);
964 if (maj_stat != GSS_S_COMPLETE)
967 if (svc_getnl(&buf->head[0]) != seq)
972 struct gss_svc_data {
973 /* decoded gss client cred: */
974 struct rpc_gss_wire_cred clcred;
975 /* save a pointer to the beginning of the encoded verifier,
976 * for use in encryption/checksumming in svcauth_gss_release: */
982 svcauth_gss_set_client(struct svc_rqst *rqstp)
984 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
985 struct rsc *rsci = svcdata->rsci;
986 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
990 * A gss export can be specified either by:
991 * export *(sec=krb5,rw)
993 * export gss/krb5(rw)
994 * The latter is deprecated; but for backwards compatibility reasons
995 * the nfsd code will still fall back on trying it if the former
996 * doesn't work; so we try to make both available to nfsd, below.
998 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
999 if (rqstp->rq_gssclient == NULL)
1001 stat = svcauth_unix_set_client(rqstp);
1002 if (stat == SVC_DROP || stat == SVC_CLOSE)
1008 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1009 struct xdr_netobj *out_handle, int *major_status)
1014 if (*major_status != GSS_S_COMPLETE)
1015 return gss_write_null_verf(rqstp);
1016 rsci = gss_svc_searchbyctx(cd, out_handle);
1018 *major_status = GSS_S_NO_CONTEXT;
1019 return gss_write_null_verf(rqstp);
1021 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1022 cache_put(&rsci->h, cd);
1027 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1028 struct kvec *argv, __be32 *authp,
1029 struct xdr_netobj *in_handle)
1031 /* Read the verifier; should be NULL: */
1032 *authp = rpc_autherr_badverf;
1033 if (argv->iov_len < 2 * 4)
1035 if (svc_getnl(argv) != RPC_AUTH_NULL)
1037 if (svc_getnl(argv) != 0)
1039 /* Martial context handle and token for upcall: */
1040 *authp = rpc_autherr_badcred;
1041 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1043 if (dup_netobj(in_handle, &gc->gc_ctx))
1045 *authp = rpc_autherr_badverf;
1051 gss_read_verf(struct rpc_gss_wire_cred *gc,
1052 struct kvec *argv, __be32 *authp,
1053 struct xdr_netobj *in_handle,
1054 struct xdr_netobj *in_token)
1056 struct xdr_netobj tmpobj;
1059 res = gss_read_common_verf(gc, argv, authp, in_handle);
1063 if (svc_safe_getnetobj(argv, &tmpobj)) {
1064 kfree(in_handle->data);
1067 if (dup_netobj(in_token, &tmpobj)) {
1068 kfree(in_handle->data);
1075 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1081 inlen = in_token->page_len;
1083 if (in_token->pages[i])
1084 put_page(in_token->pages[i]);
1085 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1088 kfree(in_token->pages);
1089 in_token->pages = NULL;
1092 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1093 struct rpc_gss_wire_cred *gc, __be32 *authp,
1094 struct xdr_netobj *in_handle,
1095 struct gssp_in_token *in_token)
1097 struct kvec *argv = &rqstp->rq_arg.head[0];
1098 unsigned int length, pgto_offs, pgfrom_offs;
1099 int pages, i, res, pgto, pgfrom;
1100 size_t inlen, to_offs, from_offs;
1102 res = gss_read_common_verf(gc, argv, authp, in_handle);
1106 inlen = svc_getnl(argv);
1107 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1110 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1111 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1112 if (!in_token->pages)
1114 in_token->page_base = 0;
1115 in_token->page_len = inlen;
1116 for (i = 0; i < pages; i++) {
1117 in_token->pages[i] = alloc_page(GFP_KERNEL);
1118 if (!in_token->pages[i]) {
1119 gss_free_in_token_pages(in_token);
1124 length = min_t(unsigned int, inlen, argv->iov_len);
1125 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1129 from_offs = rqstp->rq_arg.page_base;
1131 pgto = to_offs >> PAGE_SHIFT;
1132 pgfrom = from_offs >> PAGE_SHIFT;
1133 pgto_offs = to_offs & ~PAGE_MASK;
1134 pgfrom_offs = from_offs & ~PAGE_MASK;
1136 length = min_t(unsigned int, inlen,
1137 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1138 PAGE_SIZE - pgfrom_offs));
1139 memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1140 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1144 from_offs += length;
1151 gss_write_resv(struct kvec *resv, size_t size_limit,
1152 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1153 int major_status, int minor_status)
1155 if (resv->iov_len + 4 > size_limit)
1157 svc_putnl(resv, RPC_SUCCESS);
1158 if (svc_safe_putnetobj(resv, out_handle))
1160 if (resv->iov_len + 3 * 4 > size_limit)
1162 svc_putnl(resv, major_status);
1163 svc_putnl(resv, minor_status);
1164 svc_putnl(resv, GSS_SEQ_WIN);
1165 if (svc_safe_putnetobj(resv, out_token))
1171 * Having read the cred already and found we're in the context
1172 * initiation case, read the verifier and initiate (or check the results
1173 * of) upcalls to userspace for help with context initiation. If
1174 * the upcall results are available, write the verifier and result.
1175 * Otherwise, drop the request pending an answer to the upcall.
1177 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1178 struct rpc_gss_wire_cred *gc, __be32 *authp)
1180 struct kvec *argv = &rqstp->rq_arg.head[0];
1181 struct kvec *resv = &rqstp->rq_res.head[0];
1182 struct rsi *rsip, rsikey;
1184 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1186 memset(&rsikey, 0, sizeof(rsikey));
1187 ret = gss_read_verf(gc, argv, authp,
1188 &rsikey.in_handle, &rsikey.in_token);
1192 /* Perform upcall, or find upcall result: */
1193 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1197 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1198 /* No upcall result: */
1202 /* Got an answer to the upcall; use it: */
1203 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1204 &rsip->out_handle, &rsip->major_status))
1206 if (gss_write_resv(resv, PAGE_SIZE,
1207 &rsip->out_handle, &rsip->out_token,
1208 rsip->major_status, rsip->minor_status))
1213 cache_put(&rsip->h, sn->rsi_cache);
1217 static int gss_proxy_save_rsc(struct cache_detail *cd,
1218 struct gssp_upcall_data *ud,
1221 struct rsc rsci, *rscp = NULL;
1222 static atomic64_t ctxhctr;
1224 struct gss_api_mech *gm = NULL;
1226 int status = -EINVAL;
1228 memset(&rsci, 0, sizeof(rsci));
1229 /* context handle */
1231 /* the handle needs to be just a unique id,
1232 * use a static counter */
1233 ctxh = atomic64_inc_return(&ctxhctr);
1235 /* make a copy for the caller */
1238 /* make a copy for the rsc cache */
1239 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1241 rscp = rsc_lookup(cd, &rsci);
1246 if (!ud->found_creds) {
1247 /* userspace seem buggy, we should always get at least a
1248 * mapping to nobody */
1249 dprintk("RPC: No creds found!\n");
1252 struct timespec64 boot;
1255 rsci.cred = ud->creds;
1256 memset(&ud->creds, 0, sizeof(struct svc_cred));
1258 status = -EOPNOTSUPP;
1259 /* get mech handle from OID */
1260 gm = gss_mech_get_by_OID(&ud->mech_oid);
1263 rsci.cred.cr_gss_mech = gm;
1266 /* mech-specific data: */
1267 status = gss_import_sec_context(ud->out_handle.data,
1270 &expiry, GFP_KERNEL);
1274 getboottime64(&boot);
1275 expiry -= boot.tv_sec;
1278 rsci.h.expiry_time = expiry;
1279 rscp = rsc_update(cd, &rsci, rscp);
1284 cache_put(&rscp->h, cd);
1290 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1291 struct rpc_gss_wire_cred *gc, __be32 *authp)
1293 struct kvec *resv = &rqstp->rq_res.head[0];
1294 struct xdr_netobj cli_handle;
1295 struct gssp_upcall_data ud;
1299 struct net *net = SVC_NET(rqstp);
1300 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1302 memset(&ud, 0, sizeof(ud));
1303 ret = gss_read_proxy_verf(rqstp, gc, authp,
1304 &ud.in_handle, &ud.in_token);
1310 /* Perform synchronous upcall to gss-proxy */
1311 status = gssp_accept_sec_context_upcall(net, &ud);
1315 dprintk("RPC: svcauth_gss: gss major status = %d "
1316 "minor status = %d\n",
1317 ud.major_status, ud.minor_status);
1319 switch (ud.major_status) {
1320 case GSS_S_CONTINUE_NEEDED:
1321 cli_handle = ud.out_handle;
1323 case GSS_S_COMPLETE:
1324 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1326 pr_info("%s: gss_proxy_save_rsc failed (%d)\n",
1330 cli_handle.data = (u8 *)&handle;
1331 cli_handle.len = sizeof(handle);
1338 /* Got an answer to the upcall; use it: */
1339 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1340 &cli_handle, &ud.major_status)) {
1341 pr_info("%s: gss_write_init_verf failed\n", __func__);
1344 if (gss_write_resv(resv, PAGE_SIZE,
1345 &cli_handle, &ud.out_token,
1346 ud.major_status, ud.minor_status)) {
1347 pr_info("%s: gss_write_resv failed\n", __func__);
1353 gss_free_in_token_pages(&ud.in_token);
1354 gssp_free_upcall_data(&ud);
1359 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1360 * it to be changed if it's currently undefined (-1). If it's any other value
1361 * then return -EBUSY unless the type wouldn't have changed anyway.
1363 static int set_gss_proxy(struct net *net, int type)
1365 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1368 WARN_ON_ONCE(type != 0 && type != 1);
1369 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1370 if (ret != -1 && ret != type)
1375 static bool use_gss_proxy(struct net *net)
1377 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1379 /* If use_gss_proxy is still undefined, then try to disable it */
1380 if (sn->use_gss_proxy == -1)
1381 set_gss_proxy(net, 0);
1382 return sn->use_gss_proxy;
1385 #ifdef CONFIG_PROC_FS
1387 static ssize_t write_gssp(struct file *file, const char __user *buf,
1388 size_t count, loff_t *ppos)
1390 struct net *net = PDE_DATA(file_inode(file));
1395 if (*ppos || count > sizeof(tbuf)-1)
1397 if (copy_from_user(tbuf, buf, count))
1401 res = kstrtoul(tbuf, 0, &i);
1406 res = set_gssp_clnt(net);
1409 res = set_gss_proxy(net, 1);
1415 static ssize_t read_gssp(struct file *file, char __user *buf,
1416 size_t count, loff_t *ppos)
1418 struct net *net = PDE_DATA(file_inode(file));
1419 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1420 unsigned long p = *ppos;
1424 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1431 if (copy_to_user(buf, (void *)(tbuf+p), len))
1437 static const struct file_operations use_gss_proxy_ops = {
1438 .open = nonseekable_open,
1439 .write = write_gssp,
1443 static int create_use_gss_proxy_proc_entry(struct net *net)
1445 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1446 struct proc_dir_entry **p = &sn->use_gssp_proc;
1448 sn->use_gss_proxy = -1;
1449 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1451 &use_gss_proxy_ops, net);
1458 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1460 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1462 if (sn->use_gssp_proc) {
1463 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1464 clear_gssp_clnt(sn);
1467 #else /* CONFIG_PROC_FS */
1469 static int create_use_gss_proxy_proc_entry(struct net *net)
1474 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1476 #endif /* CONFIG_PROC_FS */
1479 * Accept an rpcsec packet.
1480 * If context establishment, punt to user space
1481 * If data exchange, verify/decrypt
1482 * If context destruction, handle here
1483 * In the context establishment and destruction case we encode
1484 * response here and return SVC_COMPLETE.
1487 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1489 struct kvec *argv = &rqstp->rq_arg.head[0];
1490 struct kvec *resv = &rqstp->rq_res.head[0];
1492 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1493 struct rpc_gss_wire_cred *gc;
1494 struct rsc *rsci = NULL;
1496 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1498 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1500 dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",
1503 *authp = rpc_autherr_badcred;
1505 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1508 rqstp->rq_auth_data = svcdata;
1509 svcdata->verf_start = NULL;
1510 svcdata->rsci = NULL;
1511 gc = &svcdata->clcred;
1513 /* start of rpc packet is 7 u32's back from here:
1514 * xid direction rpcversion prog vers proc flavour
1516 rpcstart = argv->iov_base;
1520 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1521 * at least 5 u32s, and is preceded by length, so that makes 6.
1524 if (argv->iov_len < 5 * 4)
1526 crlen = svc_getnl(argv);
1527 if (svc_getnl(argv) != RPC_GSS_VERSION)
1529 gc->gc_proc = svc_getnl(argv);
1530 gc->gc_seq = svc_getnl(argv);
1531 gc->gc_svc = svc_getnl(argv);
1532 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1534 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1537 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1540 *authp = rpc_autherr_badverf;
1541 switch (gc->gc_proc) {
1542 case RPC_GSS_PROC_INIT:
1543 case RPC_GSS_PROC_CONTINUE_INIT:
1544 if (use_gss_proxy(SVC_NET(rqstp)))
1545 return svcauth_gss_proxy_init(rqstp, gc, authp);
1547 return svcauth_gss_legacy_init(rqstp, gc, authp);
1548 case RPC_GSS_PROC_DATA:
1549 case RPC_GSS_PROC_DESTROY:
1550 /* Look up the context, and check the verifier: */
1551 *authp = rpcsec_gsserr_credproblem;
1552 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1555 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1565 *authp = rpc_autherr_rejectedcred;
1569 /* now act upon the command: */
1570 switch (gc->gc_proc) {
1571 case RPC_GSS_PROC_DESTROY:
1572 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1574 /* Delete the entry from the cache_list and call cache_put */
1575 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1576 if (resv->iov_len + 4 > PAGE_SIZE)
1578 svc_putnl(resv, RPC_SUCCESS);
1580 case RPC_GSS_PROC_DATA:
1581 *authp = rpcsec_gsserr_ctxproblem;
1582 svcdata->verf_start = resv->iov_base + resv->iov_len;
1583 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1585 rqstp->rq_cred = rsci->cred;
1586 get_group_info(rsci->cred.cr_group_info);
1587 *authp = rpc_autherr_badcred;
1588 switch (gc->gc_svc) {
1589 case RPC_GSS_SVC_NONE:
1591 case RPC_GSS_SVC_INTEGRITY:
1592 /* placeholders for length and seq. number: */
1595 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1596 gc->gc_seq, rsci->mechctx))
1598 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1600 case RPC_GSS_SVC_PRIVACY:
1601 /* placeholders for length and seq. number: */
1604 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1605 gc->gc_seq, rsci->mechctx))
1607 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1612 svcdata->rsci = rsci;
1613 cache_get(&rsci->h);
1614 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1615 rsci->mechctx->mech_type,
1625 /* Restore write pointer to its original value: */
1626 xdr_ressize_check(rqstp, reject_stat);
1636 cache_put(&rsci->h, sn->rsc_cache);
1641 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1646 p = gsd->verf_start;
1647 gsd->verf_start = NULL;
1649 /* If the reply stat is nonzero, don't wrap: */
1650 if (*(p-1) != rpc_success)
1652 /* Skip the verifier: */
1654 verf_len = ntohl(*p++);
1655 p += XDR_QUADLEN(verf_len);
1656 /* move accept_stat to right place: */
1657 memcpy(p, p + 2, 4);
1658 /* Also don't wrap if the accept stat is nonzero: */
1659 if (*p != rpc_success) {
1660 resbuf->head[0].iov_len -= 2 * 4;
1668 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1670 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1671 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1672 struct xdr_buf *resbuf = &rqstp->rq_res;
1673 struct xdr_buf integ_buf;
1674 struct xdr_netobj mic;
1677 int integ_offset, integ_len;
1680 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1683 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1684 integ_len = resbuf->len - integ_offset;
1685 BUG_ON(integ_len % 4);
1686 *p++ = htonl(integ_len);
1687 *p++ = htonl(gc->gc_seq);
1688 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1692 if (resbuf->tail[0].iov_base == NULL) {
1693 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1695 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1696 + resbuf->head[0].iov_len;
1697 resbuf->tail[0].iov_len = 0;
1699 resv = &resbuf->tail[0];
1700 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1701 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1703 svc_putnl(resv, mic.len);
1704 memset(mic.data + mic.len, 0,
1705 round_up_to_quad(mic.len) - mic.len);
1706 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1707 /* not strictly required: */
1708 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1709 BUG_ON(resv->iov_len > PAGE_SIZE);
1717 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1719 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1720 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1721 struct xdr_buf *resbuf = &rqstp->rq_res;
1722 struct page **inpages = NULL;
1727 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1731 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1732 *p++ = htonl(gc->gc_seq);
1733 inpages = resbuf->pages;
1734 /* XXX: Would be better to write some xdr helper functions for
1735 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1738 * If there is currently tail data, make sure there is
1739 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1740 * the page, and move the current tail data such that
1741 * there is RPC_MAX_AUTH_SIZE slack space available in
1742 * both the head and tail.
1744 if (resbuf->tail[0].iov_base) {
1745 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
1747 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
1748 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1749 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1751 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1752 resbuf->tail[0].iov_base,
1753 resbuf->tail[0].iov_len);
1754 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1757 * If there is no current tail data, make sure there is
1758 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1759 * allotted page, and set up tail information such that there
1760 * is RPC_MAX_AUTH_SIZE slack space available in both the
1763 if (resbuf->tail[0].iov_base == NULL) {
1764 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1766 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1767 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1768 resbuf->tail[0].iov_len = 0;
1770 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1772 *len = htonl(resbuf->len - offset);
1773 pad = 3 - ((resbuf->len - offset - 1)&3);
1774 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1776 resbuf->tail[0].iov_len += pad;
1782 svcauth_gss_release(struct svc_rqst *rqstp)
1784 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1785 struct rpc_gss_wire_cred *gc;
1786 struct xdr_buf *resbuf = &rqstp->rq_res;
1788 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1793 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1795 /* Release can be called twice, but we only wrap once. */
1796 if (gsd->verf_start == NULL)
1798 /* normally not set till svc_send, but we need it here: */
1799 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1801 resbuf->len = total_buf_len(resbuf);
1802 switch (gc->gc_svc) {
1803 case RPC_GSS_SVC_NONE:
1805 case RPC_GSS_SVC_INTEGRITY:
1806 stat = svcauth_gss_wrap_resp_integ(rqstp);
1810 case RPC_GSS_SVC_PRIVACY:
1811 stat = svcauth_gss_wrap_resp_priv(rqstp);
1816 * For any other gc_svc value, svcauth_gss_accept() already set
1817 * the auth_error appropriately; just fall through:
1824 if (rqstp->rq_client)
1825 auth_domain_put(rqstp->rq_client);
1826 rqstp->rq_client = NULL;
1827 if (rqstp->rq_gssclient)
1828 auth_domain_put(rqstp->rq_gssclient);
1829 rqstp->rq_gssclient = NULL;
1830 if (rqstp->rq_cred.cr_group_info)
1831 put_group_info(rqstp->rq_cred.cr_group_info);
1832 rqstp->rq_cred.cr_group_info = NULL;
1833 if (gsd && gsd->rsci) {
1834 cache_put(&gsd->rsci->h, sn->rsc_cache);
1841 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1843 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1844 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1851 svcauth_gss_domain_release(struct auth_domain *dom)
1853 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1856 static struct auth_ops svcauthops_gss = {
1857 .name = "rpcsec_gss",
1858 .owner = THIS_MODULE,
1859 .flavour = RPC_AUTH_GSS,
1860 .accept = svcauth_gss_accept,
1861 .release = svcauth_gss_release,
1862 .domain_release = svcauth_gss_domain_release,
1863 .set_client = svcauth_gss_set_client,
1866 static int rsi_cache_create_net(struct net *net)
1868 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1869 struct cache_detail *cd;
1872 cd = cache_create_net(&rsi_cache_template, net);
1875 err = cache_register_net(cd, net);
1877 cache_destroy_net(cd, net);
1884 static void rsi_cache_destroy_net(struct net *net)
1886 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1887 struct cache_detail *cd = sn->rsi_cache;
1889 sn->rsi_cache = NULL;
1891 cache_unregister_net(cd, net);
1892 cache_destroy_net(cd, net);
1895 static int rsc_cache_create_net(struct net *net)
1897 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1898 struct cache_detail *cd;
1901 cd = cache_create_net(&rsc_cache_template, net);
1904 err = cache_register_net(cd, net);
1906 cache_destroy_net(cd, net);
1913 static void rsc_cache_destroy_net(struct net *net)
1915 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1916 struct cache_detail *cd = sn->rsc_cache;
1918 sn->rsc_cache = NULL;
1920 cache_unregister_net(cd, net);
1921 cache_destroy_net(cd, net);
1925 gss_svc_init_net(struct net *net)
1929 rv = rsc_cache_create_net(net);
1932 rv = rsi_cache_create_net(net);
1935 rv = create_use_gss_proxy_proc_entry(net);
1940 rsi_cache_destroy_net(net);
1942 rsc_cache_destroy_net(net);
1947 gss_svc_shutdown_net(struct net *net)
1949 destroy_use_gss_proxy_proc_entry(net);
1950 rsi_cache_destroy_net(net);
1951 rsc_cache_destroy_net(net);
1957 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1961 gss_svc_shutdown(void)
1963 svc_auth_unregister(RPC_AUTH_GSS);