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))
617 * gss_check_seq_num - GSS sequence number window check
618 * @rqstp: RPC Call to use when reporting errors
619 * @rsci: cached GSS context state (updated on return)
620 * @seq_num: sequence number to check
622 * Implements sequence number algorithm as specified in
623 * RFC 2203, Section 5.3.3.1. "Context Management".
626 * %true: @rqstp's GSS sequence number is inside the window
627 * %false: @rqstp's GSS sequence number is outside the window
629 static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
632 struct gss_svc_seq_data *sd = &rsci->seqdata;
635 spin_lock(&sd->sd_lock);
636 if (seq_num > sd->sd_max) {
637 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
638 memset(sd->sd_win, 0, sizeof(sd->sd_win));
639 sd->sd_max = seq_num;
640 } else while (sd->sd_max < seq_num) {
642 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
644 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
646 } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
649 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
655 spin_unlock(&sd->sd_lock);
659 trace_rpcgss_svc_seqno_low(rqstp, seq_num,
660 sd->sd_max - GSS_SEQ_WIN,
664 trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
668 static inline u32 round_up_to_quad(u32 i)
670 return (i + 3 ) & ~3;
674 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
678 if (argv->iov_len < 4)
680 o->len = svc_getnl(argv);
681 l = round_up_to_quad(o->len);
682 if (argv->iov_len < l)
684 o->data = argv->iov_base;
691 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
695 if (resv->iov_len + 4 > PAGE_SIZE)
697 svc_putnl(resv, o->len);
698 p = resv->iov_base + resv->iov_len;
699 resv->iov_len += round_up_to_quad(o->len);
700 if (resv->iov_len > PAGE_SIZE)
702 memcpy(p, o->data, o->len);
703 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
708 * Verify the checksum on the header and return SVC_OK on success.
709 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
710 * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat.
713 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
714 __be32 *rpcstart, struct rpc_gss_wire_cred *gc)
716 struct gss_ctx *ctx_id = rsci->mechctx;
717 struct xdr_buf rpchdr;
718 struct xdr_netobj checksum;
720 struct kvec *argv = &rqstp->rq_arg.head[0];
723 /* data to compute the checksum over: */
724 iov.iov_base = rpcstart;
725 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
726 xdr_buf_from_iov(&iov, &rpchdr);
728 rqstp->rq_auth_stat = rpc_autherr_badverf;
729 if (argv->iov_len < 4)
731 flavor = svc_getnl(argv);
732 if (flavor != RPC_AUTH_GSS)
734 if (svc_safe_getnetobj(argv, &checksum))
737 if (rqstp->rq_deferred) /* skip verification of revisited request */
739 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
740 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
744 if (gc->gc_seq > MAXSEQ) {
745 trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
746 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
749 if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
755 gss_write_null_verf(struct svc_rqst *rqstp)
759 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
760 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
761 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
763 if (!xdr_ressize_check(rqstp, p))
769 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
773 struct xdr_buf verf_data;
774 struct xdr_netobj mic;
779 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
780 xdr_seq = kmalloc(4, GFP_KERNEL);
783 *xdr_seq = htonl(seq);
785 iov.iov_base = xdr_seq;
787 xdr_buf_from_iov(&iov, &verf_data);
788 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
789 mic.data = (u8 *)(p + 1);
790 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
791 if (maj_stat != GSS_S_COMPLETE)
793 *p++ = htonl(mic.len);
794 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
795 p += XDR_QUADLEN(mic.len);
796 if (!xdr_ressize_check(rqstp, p))
805 struct auth_domain h;
809 static struct auth_domain *
810 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
814 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
817 return auth_domain_find(name);
820 static struct auth_ops svcauthops_gss;
822 u32 svcauth_gss_flavor(struct auth_domain *dom)
824 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
826 return gd->pseudoflavor;
829 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
832 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
834 struct gss_domain *new;
835 struct auth_domain *test;
838 new = kmalloc(sizeof(*new), GFP_KERNEL);
841 kref_init(&new->h.ref);
842 new->h.name = kstrdup(name, GFP_KERNEL);
845 new->h.flavour = &svcauthops_gss;
846 new->pseudoflavor = pseudoflavor;
848 test = auth_domain_lookup(name, &new->h);
849 if (test != &new->h) {
850 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
853 auth_domain_put(test);
863 return ERR_PTR(stat);
865 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
868 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
873 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
880 /* It would be nice if this bit of code could be shared with the client.
882 * The client shouldn't malloc(), would have to pass in own memory.
883 * The server uses base of head iovec as read pointer, while the
884 * client uses separate pointer. */
886 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
888 u32 integ_len, rseqno, maj_stat;
890 struct xdr_netobj mic;
891 struct xdr_buf integ_buf;
895 /* NFS READ normally uses splice to send data in-place. However
896 * the data in cache can change after the reply's MIC is computed
897 * but before the RPC reply is sent. To prevent the client from
898 * rejecting the server-computed MIC in this somewhat rare case,
899 * do not use splice with the GSS integrity service.
901 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
903 /* Did we already verify the signature on the original pass through? */
904 if (rqstp->rq_deferred)
907 integ_len = svc_getnl(&buf->head[0]);
910 if (integ_len > buf->len)
912 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
915 /* copy out mic... */
916 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
918 if (mic.len > RPC_MAX_AUTH_SIZE)
920 mic.data = kmalloc(mic.len, GFP_KERNEL);
923 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
925 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
926 if (maj_stat != GSS_S_COMPLETE)
928 rseqno = svc_getnl(&buf->head[0]);
931 /* trim off the mic and padding at the end before returning */
932 xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
939 trace_rpcgss_svc_unwrap_failed(rqstp);
942 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
945 trace_rpcgss_svc_mic(rqstp, maj_stat);
950 total_buf_len(struct xdr_buf *buf)
952 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
956 fix_priv_head(struct xdr_buf *buf, int pad)
958 if (buf->page_len == 0) {
959 /* We need to adjust head and buf->len in tandem in this
960 * case to make svc_defer() work--it finds the original
961 * buffer start using buf->len - buf->head[0].iov_len. */
962 buf->head[0].iov_len -= pad;
967 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
969 u32 priv_len, maj_stat;
970 int pad, remaining_len, offset;
973 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
975 priv_len = svc_getnl(&buf->head[0]);
976 if (rqstp->rq_deferred) {
977 /* Already decrypted last time through! The sequence number
978 * check at out_seq is unnecessary but harmless: */
981 /* buf->len is the number of bytes from the original start of the
982 * request to the end, where head[0].iov_len is just the bytes
983 * not yet read from the head, so these two values are different: */
984 remaining_len = total_buf_len(buf);
985 if (priv_len > remaining_len)
987 pad = remaining_len - priv_len;
989 fix_priv_head(buf, pad);
991 maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
992 pad = priv_len - buf->len;
993 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
994 * In the krb5p case, at least, the data ends up offset, so we need to
996 /* XXX: This is very inefficient. It would be better to either do
997 * this while we encrypt, or maybe in the receive code, if we can peak
998 * ahead and work out the service and mechanism there. */
999 offset = xdr_pad_size(buf->head[0].iov_len);
1001 buf->buflen = RPCSVC_MAXPAYLOAD;
1002 xdr_shift_buf(buf, offset);
1003 fix_priv_head(buf, pad);
1005 if (maj_stat != GSS_S_COMPLETE)
1008 rseqno = svc_getnl(&buf->head[0]);
1014 trace_rpcgss_svc_unwrap_failed(rqstp);
1017 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
1020 trace_rpcgss_svc_unwrap(rqstp, maj_stat);
1024 struct gss_svc_data {
1025 /* decoded gss client cred: */
1026 struct rpc_gss_wire_cred clcred;
1027 /* save a pointer to the beginning of the encoded verifier,
1028 * for use in encryption/checksumming in svcauth_gss_release: */
1034 svcauth_gss_set_client(struct svc_rqst *rqstp)
1036 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1037 struct rsc *rsci = svcdata->rsci;
1038 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
1041 rqstp->rq_auth_stat = rpc_autherr_badcred;
1044 * A gss export can be specified either by:
1045 * export *(sec=krb5,rw)
1047 * export gss/krb5(rw)
1048 * The latter is deprecated; but for backwards compatibility reasons
1049 * the nfsd code will still fall back on trying it if the former
1050 * doesn't work; so we try to make both available to nfsd, below.
1052 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1053 if (rqstp->rq_gssclient == NULL)
1055 stat = svcauth_unix_set_client(rqstp);
1056 if (stat == SVC_DROP || stat == SVC_CLOSE)
1059 rqstp->rq_auth_stat = rpc_auth_ok;
1064 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1065 struct xdr_netobj *out_handle, int *major_status)
1070 if (*major_status != GSS_S_COMPLETE)
1071 return gss_write_null_verf(rqstp);
1072 rsci = gss_svc_searchbyctx(cd, out_handle);
1074 *major_status = GSS_S_NO_CONTEXT;
1075 return gss_write_null_verf(rqstp);
1077 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1078 cache_put(&rsci->h, cd);
1083 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1084 struct kvec *argv, __be32 *authp,
1085 struct xdr_netobj *in_handle)
1087 /* Read the verifier; should be NULL: */
1088 *authp = rpc_autherr_badverf;
1089 if (argv->iov_len < 2 * 4)
1091 if (svc_getnl(argv) != RPC_AUTH_NULL)
1093 if (svc_getnl(argv) != 0)
1095 /* Martial context handle and token for upcall: */
1096 *authp = rpc_autherr_badcred;
1097 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1099 if (dup_netobj(in_handle, &gc->gc_ctx))
1101 *authp = rpc_autherr_badverf;
1107 gss_read_verf(struct rpc_gss_wire_cred *gc,
1108 struct kvec *argv, __be32 *authp,
1109 struct xdr_netobj *in_handle,
1110 struct xdr_netobj *in_token)
1112 struct xdr_netobj tmpobj;
1115 res = gss_read_common_verf(gc, argv, authp, in_handle);
1119 if (svc_safe_getnetobj(argv, &tmpobj)) {
1120 kfree(in_handle->data);
1123 if (dup_netobj(in_token, &tmpobj)) {
1124 kfree(in_handle->data);
1131 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1137 inlen = in_token->page_len;
1139 if (in_token->pages[i])
1140 put_page(in_token->pages[i]);
1141 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1144 kfree(in_token->pages);
1145 in_token->pages = NULL;
1148 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1149 struct rpc_gss_wire_cred *gc,
1150 struct xdr_netobj *in_handle,
1151 struct gssp_in_token *in_token)
1153 struct kvec *argv = &rqstp->rq_arg.head[0];
1154 unsigned int length, pgto_offs, pgfrom_offs;
1155 int pages, i, res, pgto, pgfrom;
1156 size_t inlen, to_offs, from_offs;
1158 res = gss_read_common_verf(gc, argv, &rqstp->rq_auth_stat, in_handle);
1162 inlen = svc_getnl(argv);
1163 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1166 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1167 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1168 if (!in_token->pages)
1170 in_token->page_base = 0;
1171 in_token->page_len = inlen;
1172 for (i = 0; i < pages; i++) {
1173 in_token->pages[i] = alloc_page(GFP_KERNEL);
1174 if (!in_token->pages[i]) {
1175 gss_free_in_token_pages(in_token);
1180 length = min_t(unsigned int, inlen, argv->iov_len);
1181 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1185 from_offs = rqstp->rq_arg.page_base;
1187 pgto = to_offs >> PAGE_SHIFT;
1188 pgfrom = from_offs >> PAGE_SHIFT;
1189 pgto_offs = to_offs & ~PAGE_MASK;
1190 pgfrom_offs = from_offs & ~PAGE_MASK;
1192 length = min_t(unsigned int, inlen,
1193 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1194 PAGE_SIZE - pgfrom_offs));
1195 memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1196 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1200 from_offs += length;
1207 gss_write_resv(struct kvec *resv, size_t size_limit,
1208 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1209 int major_status, int minor_status)
1211 if (resv->iov_len + 4 > size_limit)
1213 svc_putnl(resv, RPC_SUCCESS);
1214 if (svc_safe_putnetobj(resv, out_handle))
1216 if (resv->iov_len + 3 * 4 > size_limit)
1218 svc_putnl(resv, major_status);
1219 svc_putnl(resv, minor_status);
1220 svc_putnl(resv, GSS_SEQ_WIN);
1221 if (svc_safe_putnetobj(resv, out_token))
1227 * Having read the cred already and found we're in the context
1228 * initiation case, read the verifier and initiate (or check the results
1229 * of) upcalls to userspace for help with context initiation. If
1230 * the upcall results are available, write the verifier and result.
1231 * Otherwise, drop the request pending an answer to the upcall.
1233 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1234 struct rpc_gss_wire_cred *gc)
1236 struct kvec *argv = &rqstp->rq_arg.head[0];
1237 struct kvec *resv = &rqstp->rq_res.head[0];
1238 struct rsi *rsip, rsikey;
1240 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1242 memset(&rsikey, 0, sizeof(rsikey));
1243 ret = gss_read_verf(gc, argv, &rqstp->rq_auth_stat,
1244 &rsikey.in_handle, &rsikey.in_token);
1248 /* Perform upcall, or find upcall result: */
1249 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1253 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1254 /* No upcall result: */
1258 /* Got an answer to the upcall; use it: */
1259 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1260 &rsip->out_handle, &rsip->major_status))
1262 if (gss_write_resv(resv, PAGE_SIZE,
1263 &rsip->out_handle, &rsip->out_token,
1264 rsip->major_status, rsip->minor_status))
1269 cache_put(&rsip->h, sn->rsi_cache);
1273 static int gss_proxy_save_rsc(struct cache_detail *cd,
1274 struct gssp_upcall_data *ud,
1277 struct rsc rsci, *rscp = NULL;
1278 static atomic64_t ctxhctr;
1280 struct gss_api_mech *gm = NULL;
1284 memset(&rsci, 0, sizeof(rsci));
1285 /* context handle */
1287 /* the handle needs to be just a unique id,
1288 * use a static counter */
1289 ctxh = atomic64_inc_return(&ctxhctr);
1291 /* make a copy for the caller */
1294 /* make a copy for the rsc cache */
1295 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1297 rscp = rsc_lookup(cd, &rsci);
1302 if (!ud->found_creds) {
1303 /* userspace seem buggy, we should always get at least a
1304 * mapping to nobody */
1307 struct timespec64 boot;
1310 rsci.cred = ud->creds;
1311 memset(&ud->creds, 0, sizeof(struct svc_cred));
1313 status = -EOPNOTSUPP;
1314 /* get mech handle from OID */
1315 gm = gss_mech_get_by_OID(&ud->mech_oid);
1318 rsci.cred.cr_gss_mech = gm;
1321 /* mech-specific data: */
1322 status = gss_import_sec_context(ud->out_handle.data,
1325 &expiry, GFP_KERNEL);
1329 getboottime64(&boot);
1330 expiry -= boot.tv_sec;
1333 rsci.h.expiry_time = expiry;
1334 rscp = rsc_update(cd, &rsci, rscp);
1339 cache_put(&rscp->h, cd);
1345 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1346 struct rpc_gss_wire_cred *gc)
1348 struct kvec *resv = &rqstp->rq_res.head[0];
1349 struct xdr_netobj cli_handle;
1350 struct gssp_upcall_data ud;
1354 struct net *net = SVC_NET(rqstp);
1355 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1357 memset(&ud, 0, sizeof(ud));
1358 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
1364 /* Perform synchronous upcall to gss-proxy */
1365 status = gssp_accept_sec_context_upcall(net, &ud);
1369 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1371 switch (ud.major_status) {
1372 case GSS_S_CONTINUE_NEEDED:
1373 cli_handle = ud.out_handle;
1375 case GSS_S_COMPLETE:
1376 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1379 cli_handle.data = (u8 *)&handle;
1380 cli_handle.len = sizeof(handle);
1386 /* Got an answer to the upcall; use it: */
1387 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1388 &cli_handle, &ud.major_status))
1390 if (gss_write_resv(resv, PAGE_SIZE,
1391 &cli_handle, &ud.out_token,
1392 ud.major_status, ud.minor_status))
1397 gss_free_in_token_pages(&ud.in_token);
1398 gssp_free_upcall_data(&ud);
1403 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1404 * it to be changed if it's currently undefined (-1). If it's any other value
1405 * then return -EBUSY unless the type wouldn't have changed anyway.
1407 static int set_gss_proxy(struct net *net, int type)
1409 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1412 WARN_ON_ONCE(type != 0 && type != 1);
1413 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1414 if (ret != -1 && ret != type)
1419 static bool use_gss_proxy(struct net *net)
1421 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1423 /* If use_gss_proxy is still undefined, then try to disable it */
1424 if (sn->use_gss_proxy == -1)
1425 set_gss_proxy(net, 0);
1426 return sn->use_gss_proxy;
1429 #ifdef CONFIG_PROC_FS
1431 static ssize_t write_gssp(struct file *file, const char __user *buf,
1432 size_t count, loff_t *ppos)
1434 struct net *net = PDE_DATA(file_inode(file));
1439 if (*ppos || count > sizeof(tbuf)-1)
1441 if (copy_from_user(tbuf, buf, count))
1445 res = kstrtoul(tbuf, 0, &i);
1450 res = set_gssp_clnt(net);
1453 res = set_gss_proxy(net, 1);
1459 static ssize_t read_gssp(struct file *file, char __user *buf,
1460 size_t count, loff_t *ppos)
1462 struct net *net = PDE_DATA(file_inode(file));
1463 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1464 unsigned long p = *ppos;
1468 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1475 if (copy_to_user(buf, (void *)(tbuf+p), len))
1481 static const struct proc_ops use_gss_proxy_proc_ops = {
1482 .proc_open = nonseekable_open,
1483 .proc_write = write_gssp,
1484 .proc_read = read_gssp,
1487 static int create_use_gss_proxy_proc_entry(struct net *net)
1489 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1490 struct proc_dir_entry **p = &sn->use_gssp_proc;
1492 sn->use_gss_proxy = -1;
1493 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1495 &use_gss_proxy_proc_ops, net);
1502 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1504 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1506 if (sn->use_gssp_proc) {
1507 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1508 clear_gssp_clnt(sn);
1511 #else /* CONFIG_PROC_FS */
1513 static int create_use_gss_proxy_proc_entry(struct net *net)
1518 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1520 #endif /* CONFIG_PROC_FS */
1523 * Accept an rpcsec packet.
1524 * If context establishment, punt to user space
1525 * If data exchange, verify/decrypt
1526 * If context destruction, handle here
1527 * In the context establishment and destruction case we encode
1528 * response here and return SVC_COMPLETE.
1531 svcauth_gss_accept(struct svc_rqst *rqstp)
1533 struct kvec *argv = &rqstp->rq_arg.head[0];
1534 struct kvec *resv = &rqstp->rq_res.head[0];
1536 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1537 struct rpc_gss_wire_cred *gc;
1538 struct rsc *rsci = NULL;
1540 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1542 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1544 rqstp->rq_auth_stat = rpc_autherr_badcred;
1546 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1549 rqstp->rq_auth_data = svcdata;
1550 svcdata->verf_start = NULL;
1551 svcdata->rsci = NULL;
1552 gc = &svcdata->clcred;
1554 /* start of rpc packet is 7 u32's back from here:
1555 * xid direction rpcversion prog vers proc flavour
1557 rpcstart = argv->iov_base;
1561 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1562 * at least 5 u32s, and is preceded by length, so that makes 6.
1565 if (argv->iov_len < 5 * 4)
1567 crlen = svc_getnl(argv);
1568 if (svc_getnl(argv) != RPC_GSS_VERSION)
1570 gc->gc_proc = svc_getnl(argv);
1571 gc->gc_seq = svc_getnl(argv);
1572 gc->gc_svc = svc_getnl(argv);
1573 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1575 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1578 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1581 rqstp->rq_auth_stat = rpc_autherr_badverf;
1582 switch (gc->gc_proc) {
1583 case RPC_GSS_PROC_INIT:
1584 case RPC_GSS_PROC_CONTINUE_INIT:
1585 if (use_gss_proxy(SVC_NET(rqstp)))
1586 return svcauth_gss_proxy_init(rqstp, gc);
1588 return svcauth_gss_legacy_init(rqstp, gc);
1589 case RPC_GSS_PROC_DATA:
1590 case RPC_GSS_PROC_DESTROY:
1591 /* Look up the context, and check the verifier: */
1592 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1593 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1596 switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1606 rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1610 /* now act upon the command: */
1611 switch (gc->gc_proc) {
1612 case RPC_GSS_PROC_DESTROY:
1613 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1615 /* Delete the entry from the cache_list and call cache_put */
1616 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1617 if (resv->iov_len + 4 > PAGE_SIZE)
1619 svc_putnl(resv, RPC_SUCCESS);
1621 case RPC_GSS_PROC_DATA:
1622 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1623 svcdata->verf_start = resv->iov_base + resv->iov_len;
1624 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1626 rqstp->rq_cred = rsci->cred;
1627 get_group_info(rsci->cred.cr_group_info);
1628 rqstp->rq_auth_stat = rpc_autherr_badcred;
1629 switch (gc->gc_svc) {
1630 case RPC_GSS_SVC_NONE:
1632 case RPC_GSS_SVC_INTEGRITY:
1633 /* placeholders for length and seq. number: */
1636 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1637 gc->gc_seq, rsci->mechctx))
1639 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1641 case RPC_GSS_SVC_PRIVACY:
1642 /* placeholders for length and seq. number: */
1645 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1646 gc->gc_seq, rsci->mechctx))
1648 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1653 svcdata->rsci = rsci;
1654 cache_get(&rsci->h);
1655 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1656 rsci->mechctx->mech_type,
1660 trace_rpcgss_svc_authenticate(rqstp, gc);
1667 /* Restore write pointer to its original value: */
1668 xdr_ressize_check(rqstp, reject_stat);
1678 cache_put(&rsci->h, sn->rsc_cache);
1683 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1688 p = gsd->verf_start;
1689 gsd->verf_start = NULL;
1691 /* If the reply stat is nonzero, don't wrap: */
1692 if (*(p-1) != rpc_success)
1694 /* Skip the verifier: */
1696 verf_len = ntohl(*p++);
1697 p += XDR_QUADLEN(verf_len);
1698 /* move accept_stat to right place: */
1699 memcpy(p, p + 2, 4);
1700 /* Also don't wrap if the accept stat is nonzero: */
1701 if (*p != rpc_success) {
1702 resbuf->head[0].iov_len -= 2 * 4;
1710 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1712 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1713 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1714 struct xdr_buf *resbuf = &rqstp->rq_res;
1715 struct xdr_buf integ_buf;
1716 struct xdr_netobj mic;
1719 int integ_offset, integ_len;
1722 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1725 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1726 integ_len = resbuf->len - integ_offset;
1729 *p++ = htonl(integ_len);
1730 *p++ = htonl(gc->gc_seq);
1731 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1735 if (resbuf->tail[0].iov_base == NULL) {
1736 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1738 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1739 + resbuf->head[0].iov_len;
1740 resbuf->tail[0].iov_len = 0;
1742 resv = &resbuf->tail[0];
1743 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1744 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1746 svc_putnl(resv, mic.len);
1747 memset(mic.data + mic.len, 0,
1748 round_up_to_quad(mic.len) - mic.len);
1749 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1750 /* not strictly required: */
1751 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1752 if (resv->iov_len > PAGE_SIZE)
1761 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1763 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1764 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1765 struct xdr_buf *resbuf = &rqstp->rq_res;
1766 struct page **inpages = NULL;
1771 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1775 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1776 *p++ = htonl(gc->gc_seq);
1777 inpages = resbuf->pages;
1778 /* XXX: Would be better to write some xdr helper functions for
1779 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1782 * If there is currently tail data, make sure there is
1783 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1784 * the page, and move the current tail data such that
1785 * there is RPC_MAX_AUTH_SIZE slack space available in
1786 * both the head and tail.
1788 if (resbuf->tail[0].iov_base) {
1789 if (resbuf->tail[0].iov_base >=
1790 resbuf->head[0].iov_base + PAGE_SIZE)
1792 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1794 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1795 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1797 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1798 resbuf->tail[0].iov_base,
1799 resbuf->tail[0].iov_len);
1800 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1803 * If there is no current tail data, make sure there is
1804 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1805 * allotted page, and set up tail information such that there
1806 * is RPC_MAX_AUTH_SIZE slack space available in both the
1809 if (resbuf->tail[0].iov_base == NULL) {
1810 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1812 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1813 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1814 resbuf->tail[0].iov_len = 0;
1816 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1818 *len = htonl(resbuf->len - offset);
1819 pad = 3 - ((resbuf->len - offset - 1)&3);
1820 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1822 resbuf->tail[0].iov_len += pad;
1828 svcauth_gss_release(struct svc_rqst *rqstp)
1830 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1831 struct rpc_gss_wire_cred *gc;
1832 struct xdr_buf *resbuf = &rqstp->rq_res;
1834 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1839 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1841 /* Release can be called twice, but we only wrap once. */
1842 if (gsd->verf_start == NULL)
1844 /* normally not set till svc_send, but we need it here: */
1845 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1847 resbuf->len = total_buf_len(resbuf);
1848 switch (gc->gc_svc) {
1849 case RPC_GSS_SVC_NONE:
1851 case RPC_GSS_SVC_INTEGRITY:
1852 stat = svcauth_gss_wrap_resp_integ(rqstp);
1856 case RPC_GSS_SVC_PRIVACY:
1857 stat = svcauth_gss_wrap_resp_priv(rqstp);
1862 * For any other gc_svc value, svcauth_gss_accept() already set
1863 * the auth_error appropriately; just fall through:
1870 if (rqstp->rq_client)
1871 auth_domain_put(rqstp->rq_client);
1872 rqstp->rq_client = NULL;
1873 if (rqstp->rq_gssclient)
1874 auth_domain_put(rqstp->rq_gssclient);
1875 rqstp->rq_gssclient = NULL;
1876 if (rqstp->rq_cred.cr_group_info)
1877 put_group_info(rqstp->rq_cred.cr_group_info);
1878 rqstp->rq_cred.cr_group_info = NULL;
1879 if (gsd && gsd->rsci) {
1880 cache_put(&gsd->rsci->h, sn->rsc_cache);
1887 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1889 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1890 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1897 svcauth_gss_domain_release(struct auth_domain *dom)
1899 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1902 static struct auth_ops svcauthops_gss = {
1903 .name = "rpcsec_gss",
1904 .owner = THIS_MODULE,
1905 .flavour = RPC_AUTH_GSS,
1906 .accept = svcauth_gss_accept,
1907 .release = svcauth_gss_release,
1908 .domain_release = svcauth_gss_domain_release,
1909 .set_client = svcauth_gss_set_client,
1912 static int rsi_cache_create_net(struct net *net)
1914 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1915 struct cache_detail *cd;
1918 cd = cache_create_net(&rsi_cache_template, net);
1921 err = cache_register_net(cd, net);
1923 cache_destroy_net(cd, net);
1930 static void rsi_cache_destroy_net(struct net *net)
1932 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1933 struct cache_detail *cd = sn->rsi_cache;
1935 sn->rsi_cache = NULL;
1937 cache_unregister_net(cd, net);
1938 cache_destroy_net(cd, net);
1941 static int rsc_cache_create_net(struct net *net)
1943 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1944 struct cache_detail *cd;
1947 cd = cache_create_net(&rsc_cache_template, net);
1950 err = cache_register_net(cd, net);
1952 cache_destroy_net(cd, net);
1959 static void rsc_cache_destroy_net(struct net *net)
1961 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1962 struct cache_detail *cd = sn->rsc_cache;
1964 sn->rsc_cache = NULL;
1966 cache_unregister_net(cd, net);
1967 cache_destroy_net(cd, net);
1971 gss_svc_init_net(struct net *net)
1975 rv = rsc_cache_create_net(net);
1978 rv = rsi_cache_create_net(net);
1981 rv = create_use_gss_proxy_proc_entry(net);
1986 rsi_cache_destroy_net(net);
1988 rsc_cache_destroy_net(net);
1993 gss_svc_shutdown_net(struct net *net)
1995 destroy_use_gss_proxy_proc_entry(net);
1996 rsi_cache_destroy_net(net);
1997 rsc_cache_destroy_net(net);
2003 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
2007 gss_svc_shutdown(void)
2009 svc_auth_unregister(RPC_AUTH_GSS);