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 <linux/sunrpc/gss_krb5.h>
54 #include <trace/events/rpcgss.h>
56 #include "gss_rpc_upcall.h"
59 * Unfortunately there isn't a maximum checksum size exported via the
60 * GSS API. Manufacture one based on GSS mechanisms supported by this
63 #define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN)
66 * This value may be increased in the future to accommodate other
67 * usage of the scratch buffer.
69 #define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE
72 /* decoded gss client cred: */
73 struct rpc_gss_wire_cred clcred;
74 /* save a pointer to the beginning of the encoded verifier,
75 * for use in encryption/checksumming in svcauth_gss_release: */
79 /* for temporary results */
80 u8 gsd_scratch[GSS_SCRATCH_SIZE];
83 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
86 * Key is context handle (\x if empty) and gss_token.
87 * Content is major_status minor_status (integers) context_handle, reply_token.
91 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
93 return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
96 #define RSI_HASHBITS 6
97 #define RSI_HASHMAX (1<<RSI_HASHBITS)
101 struct xdr_netobj in_handle, in_token;
102 struct xdr_netobj out_handle, out_token;
103 int major_status, minor_status;
104 struct rcu_head rcu_head;
107 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
108 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
110 static void rsi_free(struct rsi *rsii)
112 kfree(rsii->in_handle.data);
113 kfree(rsii->in_token.data);
114 kfree(rsii->out_handle.data);
115 kfree(rsii->out_token.data);
118 static void rsi_free_rcu(struct rcu_head *head)
120 struct rsi *rsii = container_of(head, struct rsi, rcu_head);
126 static void rsi_put(struct kref *ref)
128 struct rsi *rsii = container_of(ref, struct rsi, h.ref);
130 call_rcu(&rsii->rcu_head, rsi_free_rcu);
133 static inline int rsi_hash(struct rsi *item)
135 return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
136 ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
139 static int rsi_match(struct cache_head *a, struct cache_head *b)
141 struct rsi *item = container_of(a, struct rsi, h);
142 struct rsi *tmp = container_of(b, struct rsi, h);
143 return netobj_equal(&item->in_handle, &tmp->in_handle) &&
144 netobj_equal(&item->in_token, &tmp->in_token);
147 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
150 dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
151 if (len && !dst->data)
156 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
158 return dup_to_netobj(dst, src->data, src->len);
161 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
163 struct rsi *new = container_of(cnew, struct rsi, h);
164 struct rsi *item = container_of(citem, struct rsi, h);
166 new->out_handle.data = NULL;
167 new->out_handle.len = 0;
168 new->out_token.data = NULL;
169 new->out_token.len = 0;
170 new->in_handle.len = item->in_handle.len;
171 item->in_handle.len = 0;
172 new->in_token.len = item->in_token.len;
173 item->in_token.len = 0;
174 new->in_handle.data = item->in_handle.data;
175 item->in_handle.data = NULL;
176 new->in_token.data = item->in_token.data;
177 item->in_token.data = NULL;
180 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
182 struct rsi *new = container_of(cnew, struct rsi, h);
183 struct rsi *item = container_of(citem, struct rsi, h);
185 BUG_ON(new->out_handle.data || new->out_token.data);
186 new->out_handle.len = item->out_handle.len;
187 item->out_handle.len = 0;
188 new->out_token.len = item->out_token.len;
189 item->out_token.len = 0;
190 new->out_handle.data = item->out_handle.data;
191 item->out_handle.data = NULL;
192 new->out_token.data = item->out_token.data;
193 item->out_token.data = NULL;
195 new->major_status = item->major_status;
196 new->minor_status = item->minor_status;
199 static struct cache_head *rsi_alloc(void)
201 struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
208 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
210 return sunrpc_cache_pipe_upcall_timeout(cd, h);
213 static void rsi_request(struct cache_detail *cd,
214 struct cache_head *h,
215 char **bpp, int *blen)
217 struct rsi *rsii = container_of(h, struct rsi, h);
219 qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
220 qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
223 "RPCSEC/GSS credential too large - please use gssproxy\n");
226 static int rsi_parse(struct cache_detail *cd,
227 char *mesg, int mlen)
229 /* context token expiry major minor context token */
233 struct rsi rsii, *rsip = NULL;
235 int status = -EINVAL;
237 memset(&rsii, 0, sizeof(rsii));
239 len = qword_get(&mesg, buf, mlen);
243 if (dup_to_netobj(&rsii.in_handle, buf, len))
247 len = qword_get(&mesg, buf, mlen);
252 if (dup_to_netobj(&rsii.in_token, buf, len))
255 rsip = rsi_lookup(cd, &rsii);
261 expiry = get_expiry(&mesg);
267 len = qword_get(&mesg, buf, mlen);
270 rsii.major_status = simple_strtoul(buf, &ep, 10);
273 len = qword_get(&mesg, buf, mlen);
276 rsii.minor_status = simple_strtoul(buf, &ep, 10);
281 len = qword_get(&mesg, buf, mlen);
285 if (dup_to_netobj(&rsii.out_handle, buf, len))
289 len = qword_get(&mesg, buf, mlen);
294 if (dup_to_netobj(&rsii.out_token, buf, len))
296 rsii.h.expiry_time = expiry;
297 rsip = rsi_update(cd, &rsii, rsip);
302 cache_put(&rsip->h, cd);
308 static const struct cache_detail rsi_cache_template = {
309 .owner = THIS_MODULE,
310 .hash_size = RSI_HASHMAX,
311 .name = "auth.rpcsec.init",
312 .cache_put = rsi_put,
313 .cache_upcall = rsi_upcall,
314 .cache_request = rsi_request,
315 .cache_parse = rsi_parse,
318 .update = update_rsi,
322 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
324 struct cache_head *ch;
325 int hash = rsi_hash(item);
327 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
329 return container_of(ch, struct rsi, h);
334 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
336 struct cache_head *ch;
337 int hash = rsi_hash(new);
339 ch = sunrpc_cache_update(cd, &new->h,
342 return container_of(ch, struct rsi, h);
349 * The rpcsec_context cache is used to store a context that is
350 * used in data exchange.
351 * The key is a context handle. The content is:
352 * uid, gidlist, mechanism, service-set, mech-specific-data
355 #define RSC_HASHBITS 10
356 #define RSC_HASHMAX (1<<RSC_HASHBITS)
358 #define GSS_SEQ_WIN 128
360 struct gss_svc_seq_data {
361 /* highest seq number seen so far: */
363 /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
364 * sd_win is nonzero iff sequence number i has been seen already: */
365 unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
371 struct xdr_netobj handle;
372 struct svc_cred cred;
373 struct gss_svc_seq_data seqdata;
374 struct gss_ctx *mechctx;
375 struct rcu_head rcu_head;
378 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
379 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
381 static void rsc_free(struct rsc *rsci)
383 kfree(rsci->handle.data);
385 gss_delete_sec_context(&rsci->mechctx);
386 free_svc_cred(&rsci->cred);
389 static void rsc_free_rcu(struct rcu_head *head)
391 struct rsc *rsci = container_of(head, struct rsc, rcu_head);
393 kfree(rsci->handle.data);
397 static void rsc_put(struct kref *ref)
399 struct rsc *rsci = container_of(ref, struct rsc, h.ref);
402 gss_delete_sec_context(&rsci->mechctx);
403 free_svc_cred(&rsci->cred);
404 call_rcu(&rsci->rcu_head, rsc_free_rcu);
408 rsc_hash(struct rsc *rsci)
410 return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
414 rsc_match(struct cache_head *a, struct cache_head *b)
416 struct rsc *new = container_of(a, struct rsc, h);
417 struct rsc *tmp = container_of(b, struct rsc, h);
419 return netobj_equal(&new->handle, &tmp->handle);
423 rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
425 struct rsc *new = container_of(cnew, struct rsc, h);
426 struct rsc *tmp = container_of(ctmp, struct rsc, h);
428 new->handle.len = tmp->handle.len;
430 new->handle.data = tmp->handle.data;
431 tmp->handle.data = NULL;
433 init_svc_cred(&new->cred);
437 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
439 struct rsc *new = container_of(cnew, struct rsc, h);
440 struct rsc *tmp = container_of(ctmp, struct rsc, h);
442 new->mechctx = tmp->mechctx;
444 memset(&new->seqdata, 0, sizeof(new->seqdata));
445 spin_lock_init(&new->seqdata.sd_lock);
446 new->cred = tmp->cred;
447 init_svc_cred(&tmp->cred);
450 static struct cache_head *
453 struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
460 static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
465 static int rsc_parse(struct cache_detail *cd,
466 char *mesg, int mlen)
468 /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
472 struct rsc rsci, *rscp = NULL;
474 int status = -EINVAL;
475 struct gss_api_mech *gm = NULL;
477 memset(&rsci, 0, sizeof(rsci));
479 len = qword_get(&mesg, buf, mlen);
480 if (len < 0) goto out;
482 if (dup_to_netobj(&rsci.handle, buf, len))
487 expiry = get_expiry(&mesg);
492 rscp = rsc_lookup(cd, &rsci);
496 /* uid, or NEGATIVE */
497 rv = get_int(&mesg, &id);
501 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
506 * NOTE: we skip uid_valid()/gid_valid() checks here:
507 * instead, * -1 id's are later mapped to the
508 * (export-specific) anonymous id by nfsd_setuser.
510 * (But supplementary gid's get no such special
511 * treatment so are checked for validity here.)
514 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
517 if (get_int(&mesg, &id))
519 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
521 /* number of additional gid's */
522 if (get_int(&mesg, &N))
524 if (N < 0 || N > NGROUPS_MAX)
527 rsci.cred.cr_group_info = groups_alloc(N);
528 if (rsci.cred.cr_group_info == NULL)
533 for (i=0; i<N; i++) {
535 if (get_int(&mesg, &id))
537 kgid = make_kgid(current_user_ns(), id);
538 if (!gid_valid(kgid))
540 rsci.cred.cr_group_info->gid[i] = kgid;
542 groups_sort(rsci.cred.cr_group_info);
545 len = qword_get(&mesg, buf, mlen);
548 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
549 status = -EOPNOTSUPP;
554 /* mech-specific data: */
555 len = qword_get(&mesg, buf, mlen);
558 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
563 /* get client name */
564 len = qword_get(&mesg, buf, mlen);
566 rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
567 if (!rsci.cred.cr_principal) {
574 rsci.h.expiry_time = expiry;
575 rscp = rsc_update(cd, &rsci, rscp);
580 cache_put(&rscp->h, cd);
586 static const struct cache_detail rsc_cache_template = {
587 .owner = THIS_MODULE,
588 .hash_size = RSC_HASHMAX,
589 .name = "auth.rpcsec.context",
590 .cache_put = rsc_put,
591 .cache_upcall = rsc_upcall,
592 .cache_parse = rsc_parse,
595 .update = update_rsc,
599 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
601 struct cache_head *ch;
602 int hash = rsc_hash(item);
604 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
606 return container_of(ch, struct rsc, h);
611 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
613 struct cache_head *ch;
614 int hash = rsc_hash(new);
616 ch = sunrpc_cache_update(cd, &new->h,
619 return container_of(ch, struct rsc, h);
626 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
631 memset(&rsci, 0, sizeof(rsci));
632 if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
634 found = rsc_lookup(cd, &rsci);
638 if (cache_check(cd, &found->h, NULL))
644 * gss_check_seq_num - GSS sequence number window check
645 * @rqstp: RPC Call to use when reporting errors
646 * @rsci: cached GSS context state (updated on return)
647 * @seq_num: sequence number to check
649 * Implements sequence number algorithm as specified in
650 * RFC 2203, Section 5.3.3.1. "Context Management".
653 * %true: @rqstp's GSS sequence number is inside the window
654 * %false: @rqstp's GSS sequence number is outside the window
656 static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
659 struct gss_svc_seq_data *sd = &rsci->seqdata;
662 spin_lock(&sd->sd_lock);
663 if (seq_num > sd->sd_max) {
664 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
665 memset(sd->sd_win, 0, sizeof(sd->sd_win));
666 sd->sd_max = seq_num;
667 } else while (sd->sd_max < seq_num) {
669 __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
671 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
673 } else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
676 if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
682 spin_unlock(&sd->sd_lock);
686 trace_rpcgss_svc_seqno_low(rqstp, seq_num,
687 sd->sd_max - GSS_SEQ_WIN,
691 trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
695 static inline u32 round_up_to_quad(u32 i)
697 return (i + 3 ) & ~3;
701 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
705 if (argv->iov_len < 4)
707 o->len = svc_getnl(argv);
708 l = round_up_to_quad(o->len);
709 if (argv->iov_len < l)
711 o->data = argv->iov_base;
718 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
722 if (resv->iov_len + 4 > PAGE_SIZE)
724 svc_putnl(resv, o->len);
725 p = resv->iov_base + resv->iov_len;
726 resv->iov_len += round_up_to_quad(o->len);
727 if (resv->iov_len > PAGE_SIZE)
729 memcpy(p, o->data, o->len);
730 memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
735 * Verify the checksum on the header and return SVC_OK on success.
736 * Otherwise, return SVC_DROP (in the case of a bad sequence number)
737 * or return SVC_DENIED and indicate error in rqstp->rq_auth_stat.
740 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
741 __be32 *rpcstart, struct rpc_gss_wire_cred *gc)
743 struct gss_ctx *ctx_id = rsci->mechctx;
744 struct xdr_buf rpchdr;
745 struct xdr_netobj checksum;
747 struct kvec *argv = &rqstp->rq_arg.head[0];
750 /* data to compute the checksum over: */
751 iov.iov_base = rpcstart;
752 iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
753 xdr_buf_from_iov(&iov, &rpchdr);
755 rqstp->rq_auth_stat = rpc_autherr_badverf;
756 if (argv->iov_len < 4)
758 flavor = svc_getnl(argv);
759 if (flavor != RPC_AUTH_GSS)
761 if (svc_safe_getnetobj(argv, &checksum))
764 if (rqstp->rq_deferred) /* skip verification of revisited request */
766 if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
767 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
771 if (gc->gc_seq > MAXSEQ) {
772 trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
773 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
776 if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
782 gss_write_null_verf(struct svc_rqst *rqstp)
786 svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
787 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
788 /* don't really need to check if head->iov_len > PAGE_SIZE ... */
790 if (!xdr_ressize_check(rqstp, p))
796 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
800 struct xdr_buf verf_data;
801 struct xdr_netobj mic;
806 svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
807 xdr_seq = kmalloc(4, GFP_KERNEL);
810 *xdr_seq = htonl(seq);
812 iov.iov_base = xdr_seq;
814 xdr_buf_from_iov(&iov, &verf_data);
815 p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
816 mic.data = (u8 *)(p + 1);
817 maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
818 if (maj_stat != GSS_S_COMPLETE)
820 *p++ = htonl(mic.len);
821 memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
822 p += XDR_QUADLEN(mic.len);
823 if (!xdr_ressize_check(rqstp, p))
832 struct auth_domain h;
836 static struct auth_domain *
837 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
841 name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
844 return auth_domain_find(name);
847 static struct auth_ops svcauthops_gss;
849 u32 svcauth_gss_flavor(struct auth_domain *dom)
851 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
853 return gd->pseudoflavor;
856 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
859 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
861 struct gss_domain *new;
862 struct auth_domain *test;
865 new = kmalloc(sizeof(*new), GFP_KERNEL);
868 kref_init(&new->h.ref);
869 new->h.name = kstrdup(name, GFP_KERNEL);
872 new->h.flavour = &svcauthops_gss;
873 new->pseudoflavor = pseudoflavor;
875 test = auth_domain_lookup(name, &new->h);
876 if (test != &new->h) {
877 pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
880 auth_domain_put(test);
890 return ERR_PTR(stat);
892 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
895 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
900 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
907 /* It would be nice if this bit of code could be shared with the client.
909 * The client shouldn't malloc(), would have to pass in own memory.
910 * The server uses base of head iovec as read pointer, while the
911 * client uses separate pointer. */
913 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
915 struct gss_svc_data *gsd = rqstp->rq_auth_data;
916 u32 integ_len, rseqno, maj_stat;
917 struct xdr_netobj mic;
918 struct xdr_buf integ_buf;
920 /* NFS READ normally uses splice to send data in-place. However
921 * the data in cache can change after the reply's MIC is computed
922 * but before the RPC reply is sent. To prevent the client from
923 * rejecting the server-computed MIC in this somewhat rare case,
924 * do not use splice with the GSS integrity service.
926 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
928 /* Did we already verify the signature on the original pass through? */
929 if (rqstp->rq_deferred)
932 integ_len = svc_getnl(&buf->head[0]);
935 if (integ_len > buf->len)
937 if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
940 /* copy out mic... */
941 if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
943 if (mic.len > sizeof(gsd->gsd_scratch))
945 mic.data = gsd->gsd_scratch;
946 if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
948 maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
949 if (maj_stat != GSS_S_COMPLETE)
951 rseqno = svc_getnl(&buf->head[0]);
954 /* trim off the mic and padding at the end before returning */
955 xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
959 trace_rpcgss_svc_unwrap_failed(rqstp);
962 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
965 trace_rpcgss_svc_mic(rqstp, maj_stat);
970 total_buf_len(struct xdr_buf *buf)
972 return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
976 fix_priv_head(struct xdr_buf *buf, int pad)
978 if (buf->page_len == 0) {
979 /* We need to adjust head and buf->len in tandem in this
980 * case to make svc_defer() work--it finds the original
981 * buffer start using buf->len - buf->head[0].iov_len. */
982 buf->head[0].iov_len -= pad;
987 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
989 u32 priv_len, maj_stat;
990 int pad, remaining_len, offset;
993 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
995 priv_len = svc_getnl(&buf->head[0]);
996 if (rqstp->rq_deferred) {
997 /* Already decrypted last time through! The sequence number
998 * check at out_seq is unnecessary but harmless: */
1001 /* buf->len is the number of bytes from the original start of the
1002 * request to the end, where head[0].iov_len is just the bytes
1003 * not yet read from the head, so these two values are different: */
1004 remaining_len = total_buf_len(buf);
1005 if (priv_len > remaining_len)
1007 pad = remaining_len - priv_len;
1009 fix_priv_head(buf, pad);
1011 maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
1012 pad = priv_len - buf->len;
1013 /* The upper layers assume the buffer is aligned on 4-byte boundaries.
1014 * In the krb5p case, at least, the data ends up offset, so we need to
1015 * move it around. */
1016 /* XXX: This is very inefficient. It would be better to either do
1017 * this while we encrypt, or maybe in the receive code, if we can peak
1018 * ahead and work out the service and mechanism there. */
1019 offset = xdr_pad_size(buf->head[0].iov_len);
1021 buf->buflen = RPCSVC_MAXPAYLOAD;
1022 xdr_shift_buf(buf, offset);
1023 fix_priv_head(buf, pad);
1025 if (maj_stat != GSS_S_COMPLETE)
1028 rseqno = svc_getnl(&buf->head[0]);
1034 trace_rpcgss_svc_unwrap_failed(rqstp);
1037 trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
1040 trace_rpcgss_svc_unwrap(rqstp, maj_stat);
1045 svcauth_gss_set_client(struct svc_rqst *rqstp)
1047 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1048 struct rsc *rsci = svcdata->rsci;
1049 struct rpc_gss_wire_cred *gc = &svcdata->clcred;
1052 rqstp->rq_auth_stat = rpc_autherr_badcred;
1055 * A gss export can be specified either by:
1056 * export *(sec=krb5,rw)
1058 * export gss/krb5(rw)
1059 * The latter is deprecated; but for backwards compatibility reasons
1060 * the nfsd code will still fall back on trying it if the former
1061 * doesn't work; so we try to make both available to nfsd, below.
1063 rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1064 if (rqstp->rq_gssclient == NULL)
1066 stat = svcauth_unix_set_client(rqstp);
1067 if (stat == SVC_DROP || stat == SVC_CLOSE)
1070 rqstp->rq_auth_stat = rpc_auth_ok;
1075 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1076 struct xdr_netobj *out_handle, int *major_status)
1081 if (*major_status != GSS_S_COMPLETE)
1082 return gss_write_null_verf(rqstp);
1083 rsci = gss_svc_searchbyctx(cd, out_handle);
1085 *major_status = GSS_S_NO_CONTEXT;
1086 return gss_write_null_verf(rqstp);
1088 rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1089 cache_put(&rsci->h, cd);
1094 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1095 struct kvec *argv, __be32 *authp,
1096 struct xdr_netobj *in_handle)
1098 /* Read the verifier; should be NULL: */
1099 *authp = rpc_autherr_badverf;
1100 if (argv->iov_len < 2 * 4)
1102 if (svc_getnl(argv) != RPC_AUTH_NULL)
1104 if (svc_getnl(argv) != 0)
1106 /* Martial context handle and token for upcall: */
1107 *authp = rpc_autherr_badcred;
1108 if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1110 if (dup_netobj(in_handle, &gc->gc_ctx))
1112 *authp = rpc_autherr_badverf;
1118 gss_read_verf(struct rpc_gss_wire_cred *gc,
1119 struct kvec *argv, __be32 *authp,
1120 struct xdr_netobj *in_handle,
1121 struct xdr_netobj *in_token)
1123 struct xdr_netobj tmpobj;
1126 res = gss_read_common_verf(gc, argv, authp, in_handle);
1130 if (svc_safe_getnetobj(argv, &tmpobj)) {
1131 kfree(in_handle->data);
1134 if (dup_netobj(in_token, &tmpobj)) {
1135 kfree(in_handle->data);
1142 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1148 inlen = in_token->page_len;
1150 if (in_token->pages[i])
1151 put_page(in_token->pages[i]);
1152 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1155 kfree(in_token->pages);
1156 in_token->pages = NULL;
1159 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1160 struct rpc_gss_wire_cred *gc,
1161 struct xdr_netobj *in_handle,
1162 struct gssp_in_token *in_token)
1164 struct kvec *argv = &rqstp->rq_arg.head[0];
1165 unsigned int length, pgto_offs, pgfrom_offs;
1166 int pages, i, res, pgto, pgfrom;
1167 size_t inlen, to_offs, from_offs;
1169 res = gss_read_common_verf(gc, argv, &rqstp->rq_auth_stat, in_handle);
1173 inlen = svc_getnl(argv);
1174 if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) {
1175 kfree(in_handle->data);
1179 pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1180 in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1181 if (!in_token->pages) {
1182 kfree(in_handle->data);
1185 in_token->page_base = 0;
1186 in_token->page_len = inlen;
1187 for (i = 0; i < pages; i++) {
1188 in_token->pages[i] = alloc_page(GFP_KERNEL);
1189 if (!in_token->pages[i]) {
1190 kfree(in_handle->data);
1191 gss_free_in_token_pages(in_token);
1196 length = min_t(unsigned int, inlen, argv->iov_len);
1197 memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1201 from_offs = rqstp->rq_arg.page_base;
1203 pgto = to_offs >> PAGE_SHIFT;
1204 pgfrom = from_offs >> PAGE_SHIFT;
1205 pgto_offs = to_offs & ~PAGE_MASK;
1206 pgfrom_offs = from_offs & ~PAGE_MASK;
1208 length = min_t(unsigned int, inlen,
1209 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1210 PAGE_SIZE - pgfrom_offs));
1211 memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1212 page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1216 from_offs += length;
1223 gss_write_resv(struct kvec *resv, size_t size_limit,
1224 struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1225 int major_status, int minor_status)
1227 if (resv->iov_len + 4 > size_limit)
1229 svc_putnl(resv, RPC_SUCCESS);
1230 if (svc_safe_putnetobj(resv, out_handle))
1232 if (resv->iov_len + 3 * 4 > size_limit)
1234 svc_putnl(resv, major_status);
1235 svc_putnl(resv, minor_status);
1236 svc_putnl(resv, GSS_SEQ_WIN);
1237 if (svc_safe_putnetobj(resv, out_token))
1243 * Having read the cred already and found we're in the context
1244 * initiation case, read the verifier and initiate (or check the results
1245 * of) upcalls to userspace for help with context initiation. If
1246 * the upcall results are available, write the verifier and result.
1247 * Otherwise, drop the request pending an answer to the upcall.
1249 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1250 struct rpc_gss_wire_cred *gc)
1252 struct kvec *argv = &rqstp->rq_arg.head[0];
1253 struct kvec *resv = &rqstp->rq_res.head[0];
1254 struct rsi *rsip, rsikey;
1256 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1258 memset(&rsikey, 0, sizeof(rsikey));
1259 ret = gss_read_verf(gc, argv, &rqstp->rq_auth_stat,
1260 &rsikey.in_handle, &rsikey.in_token);
1264 /* Perform upcall, or find upcall result: */
1265 rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1269 if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1270 /* No upcall result: */
1274 /* Got an answer to the upcall; use it: */
1275 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1276 &rsip->out_handle, &rsip->major_status))
1278 if (gss_write_resv(resv, PAGE_SIZE,
1279 &rsip->out_handle, &rsip->out_token,
1280 rsip->major_status, rsip->minor_status))
1285 cache_put(&rsip->h, sn->rsi_cache);
1289 static int gss_proxy_save_rsc(struct cache_detail *cd,
1290 struct gssp_upcall_data *ud,
1293 struct rsc rsci, *rscp = NULL;
1294 static atomic64_t ctxhctr;
1296 struct gss_api_mech *gm = NULL;
1300 memset(&rsci, 0, sizeof(rsci));
1301 /* context handle */
1303 /* the handle needs to be just a unique id,
1304 * use a static counter */
1305 ctxh = atomic64_inc_return(&ctxhctr);
1307 /* make a copy for the caller */
1310 /* make a copy for the rsc cache */
1311 if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1313 rscp = rsc_lookup(cd, &rsci);
1318 if (!ud->found_creds) {
1319 /* userspace seem buggy, we should always get at least a
1320 * mapping to nobody */
1323 struct timespec64 boot;
1326 rsci.cred = ud->creds;
1327 memset(&ud->creds, 0, sizeof(struct svc_cred));
1329 status = -EOPNOTSUPP;
1330 /* get mech handle from OID */
1331 gm = gss_mech_get_by_OID(&ud->mech_oid);
1334 rsci.cred.cr_gss_mech = gm;
1337 /* mech-specific data: */
1338 status = gss_import_sec_context(ud->out_handle.data,
1341 &expiry, GFP_KERNEL);
1345 getboottime64(&boot);
1346 expiry -= boot.tv_sec;
1349 rsci.h.expiry_time = expiry;
1350 rscp = rsc_update(cd, &rsci, rscp);
1355 cache_put(&rscp->h, cd);
1361 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1362 struct rpc_gss_wire_cred *gc)
1364 struct kvec *resv = &rqstp->rq_res.head[0];
1365 struct xdr_netobj cli_handle;
1366 struct gssp_upcall_data ud;
1370 struct net *net = SVC_NET(rqstp);
1371 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1373 memset(&ud, 0, sizeof(ud));
1374 ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
1380 /* Perform synchronous upcall to gss-proxy */
1381 status = gssp_accept_sec_context_upcall(net, &ud);
1385 trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1387 switch (ud.major_status) {
1388 case GSS_S_CONTINUE_NEEDED:
1389 cli_handle = ud.out_handle;
1391 case GSS_S_COMPLETE:
1392 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1395 cli_handle.data = (u8 *)&handle;
1396 cli_handle.len = sizeof(handle);
1402 /* Got an answer to the upcall; use it: */
1403 if (gss_write_init_verf(sn->rsc_cache, rqstp,
1404 &cli_handle, &ud.major_status))
1406 if (gss_write_resv(resv, PAGE_SIZE,
1407 &cli_handle, &ud.out_token,
1408 ud.major_status, ud.minor_status))
1413 gss_free_in_token_pages(&ud.in_token);
1414 gssp_free_upcall_data(&ud);
1419 * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1420 * it to be changed if it's currently undefined (-1). If it's any other value
1421 * then return -EBUSY unless the type wouldn't have changed anyway.
1423 static int set_gss_proxy(struct net *net, int type)
1425 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1428 WARN_ON_ONCE(type != 0 && type != 1);
1429 ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1430 if (ret != -1 && ret != type)
1435 static bool use_gss_proxy(struct net *net)
1437 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1439 /* If use_gss_proxy is still undefined, then try to disable it */
1440 if (sn->use_gss_proxy == -1)
1441 set_gss_proxy(net, 0);
1442 return sn->use_gss_proxy;
1445 #ifdef CONFIG_PROC_FS
1447 static ssize_t write_gssp(struct file *file, const char __user *buf,
1448 size_t count, loff_t *ppos)
1450 struct net *net = pde_data(file_inode(file));
1455 if (*ppos || count > sizeof(tbuf)-1)
1457 if (copy_from_user(tbuf, buf, count))
1461 res = kstrtoul(tbuf, 0, &i);
1466 res = set_gssp_clnt(net);
1469 res = set_gss_proxy(net, 1);
1475 static ssize_t read_gssp(struct file *file, char __user *buf,
1476 size_t count, loff_t *ppos)
1478 struct net *net = pde_data(file_inode(file));
1479 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1480 unsigned long p = *ppos;
1484 snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1491 if (copy_to_user(buf, (void *)(tbuf+p), len))
1497 static const struct proc_ops use_gss_proxy_proc_ops = {
1498 .proc_open = nonseekable_open,
1499 .proc_write = write_gssp,
1500 .proc_read = read_gssp,
1503 static int create_use_gss_proxy_proc_entry(struct net *net)
1505 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1506 struct proc_dir_entry **p = &sn->use_gssp_proc;
1508 sn->use_gss_proxy = -1;
1509 *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1511 &use_gss_proxy_proc_ops, net);
1518 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1520 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1522 if (sn->use_gssp_proc) {
1523 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1524 clear_gssp_clnt(sn);
1527 #else /* CONFIG_PROC_FS */
1529 static int create_use_gss_proxy_proc_entry(struct net *net)
1534 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1536 #endif /* CONFIG_PROC_FS */
1539 * Accept an rpcsec packet.
1540 * If context establishment, punt to user space
1541 * If data exchange, verify/decrypt
1542 * If context destruction, handle here
1543 * In the context establishment and destruction case we encode
1544 * response here and return SVC_COMPLETE.
1547 svcauth_gss_accept(struct svc_rqst *rqstp)
1549 struct kvec *argv = &rqstp->rq_arg.head[0];
1550 struct kvec *resv = &rqstp->rq_res.head[0];
1552 struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1553 struct rpc_gss_wire_cred *gc;
1554 struct rsc *rsci = NULL;
1556 __be32 *reject_stat = resv->iov_base + resv->iov_len;
1558 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1560 rqstp->rq_auth_stat = rpc_autherr_badcred;
1562 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1565 rqstp->rq_auth_data = svcdata;
1566 svcdata->verf_start = NULL;
1567 svcdata->rsci = NULL;
1568 gc = &svcdata->clcred;
1570 /* start of rpc packet is 7 u32's back from here:
1571 * xid direction rpcversion prog vers proc flavour
1573 rpcstart = argv->iov_base;
1577 * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1578 * at least 5 u32s, and is preceded by length, so that makes 6.
1581 if (argv->iov_len < 5 * 4)
1583 crlen = svc_getnl(argv);
1584 if (svc_getnl(argv) != RPC_GSS_VERSION)
1586 gc->gc_proc = svc_getnl(argv);
1587 gc->gc_seq = svc_getnl(argv);
1588 gc->gc_svc = svc_getnl(argv);
1589 if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1591 if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1594 if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1597 rqstp->rq_auth_stat = rpc_autherr_badverf;
1598 switch (gc->gc_proc) {
1599 case RPC_GSS_PROC_INIT:
1600 case RPC_GSS_PROC_CONTINUE_INIT:
1601 if (use_gss_proxy(SVC_NET(rqstp)))
1602 return svcauth_gss_proxy_init(rqstp, gc);
1604 return svcauth_gss_legacy_init(rqstp, gc);
1605 case RPC_GSS_PROC_DATA:
1606 case RPC_GSS_PROC_DESTROY:
1607 /* Look up the context, and check the verifier: */
1608 rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
1609 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1612 switch (gss_verify_header(rqstp, rsci, rpcstart, gc)) {
1622 rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
1626 /* now act upon the command: */
1627 switch (gc->gc_proc) {
1628 case RPC_GSS_PROC_DESTROY:
1629 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1631 /* Delete the entry from the cache_list and call cache_put */
1632 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1633 if (resv->iov_len + 4 > PAGE_SIZE)
1635 svc_putnl(resv, RPC_SUCCESS);
1637 case RPC_GSS_PROC_DATA:
1638 rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
1639 svcdata->verf_start = resv->iov_base + resv->iov_len;
1640 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1642 rqstp->rq_cred = rsci->cred;
1643 get_group_info(rsci->cred.cr_group_info);
1644 rqstp->rq_auth_stat = rpc_autherr_badcred;
1645 switch (gc->gc_svc) {
1646 case RPC_GSS_SVC_NONE:
1648 case RPC_GSS_SVC_INTEGRITY:
1649 /* placeholders for length and seq. number: */
1652 if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1653 gc->gc_seq, rsci->mechctx))
1655 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1657 case RPC_GSS_SVC_PRIVACY:
1658 /* placeholders for length and seq. number: */
1661 if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1662 gc->gc_seq, rsci->mechctx))
1664 rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1669 svcdata->rsci = rsci;
1670 cache_get(&rsci->h);
1671 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1672 rsci->mechctx->mech_type,
1676 trace_rpcgss_svc_authenticate(rqstp, gc);
1683 /* Restore write pointer to its original value: */
1684 xdr_ressize_check(rqstp, reject_stat);
1694 cache_put(&rsci->h, sn->rsc_cache);
1699 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1704 p = gsd->verf_start;
1705 gsd->verf_start = NULL;
1707 /* If the reply stat is nonzero, don't wrap: */
1708 if (*(p-1) != rpc_success)
1710 /* Skip the verifier: */
1712 verf_len = ntohl(*p++);
1713 p += XDR_QUADLEN(verf_len);
1714 /* move accept_stat to right place: */
1715 memcpy(p, p + 2, 4);
1716 /* Also don't wrap if the accept stat is nonzero: */
1717 if (*p != rpc_success) {
1718 resbuf->head[0].iov_len -= 2 * 4;
1726 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1728 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1729 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1730 struct xdr_buf *resbuf = &rqstp->rq_res;
1731 struct xdr_buf integ_buf;
1732 struct xdr_netobj mic;
1735 int integ_offset, integ_len;
1738 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1741 integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1742 integ_len = resbuf->len - integ_offset;
1745 *p++ = htonl(integ_len);
1746 *p++ = htonl(gc->gc_seq);
1747 if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1751 if (resbuf->tail[0].iov_base == NULL) {
1752 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1754 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1755 + resbuf->head[0].iov_len;
1756 resbuf->tail[0].iov_len = 0;
1758 resv = &resbuf->tail[0];
1759 mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1760 if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1762 svc_putnl(resv, mic.len);
1763 memset(mic.data + mic.len, 0,
1764 round_up_to_quad(mic.len) - mic.len);
1765 resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1766 /* not strictly required: */
1767 resbuf->len += XDR_QUADLEN(mic.len) << 2;
1768 if (resv->iov_len > PAGE_SIZE)
1777 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1779 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1780 struct rpc_gss_wire_cred *gc = &gsd->clcred;
1781 struct xdr_buf *resbuf = &rqstp->rq_res;
1782 struct page **inpages = NULL;
1787 p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1791 offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1792 *p++ = htonl(gc->gc_seq);
1793 inpages = resbuf->pages;
1794 /* XXX: Would be better to write some xdr helper functions for
1795 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1798 * If there is currently tail data, make sure there is
1799 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1800 * the page, and move the current tail data such that
1801 * there is RPC_MAX_AUTH_SIZE slack space available in
1802 * both the head and tail.
1804 if (resbuf->tail[0].iov_base) {
1805 if (resbuf->tail[0].iov_base >=
1806 resbuf->head[0].iov_base + PAGE_SIZE)
1808 if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1810 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1811 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1813 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1814 resbuf->tail[0].iov_base,
1815 resbuf->tail[0].iov_len);
1816 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1819 * If there is no current tail data, make sure there is
1820 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1821 * allotted page, and set up tail information such that there
1822 * is RPC_MAX_AUTH_SIZE slack space available in both the
1825 if (resbuf->tail[0].iov_base == NULL) {
1826 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1828 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1829 + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1830 resbuf->tail[0].iov_len = 0;
1832 if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1834 *len = htonl(resbuf->len - offset);
1835 pad = 3 - ((resbuf->len - offset - 1)&3);
1836 p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1838 resbuf->tail[0].iov_len += pad;
1844 svcauth_gss_release(struct svc_rqst *rqstp)
1846 struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1847 struct rpc_gss_wire_cred *gc;
1848 struct xdr_buf *resbuf = &rqstp->rq_res;
1850 struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1855 if (gc->gc_proc != RPC_GSS_PROC_DATA)
1857 /* Release can be called twice, but we only wrap once. */
1858 if (gsd->verf_start == NULL)
1860 /* normally not set till svc_send, but we need it here: */
1861 /* XXX: what for? Do we mess it up the moment we call svc_putu32
1863 resbuf->len = total_buf_len(resbuf);
1864 switch (gc->gc_svc) {
1865 case RPC_GSS_SVC_NONE:
1867 case RPC_GSS_SVC_INTEGRITY:
1868 stat = svcauth_gss_wrap_resp_integ(rqstp);
1872 case RPC_GSS_SVC_PRIVACY:
1873 stat = svcauth_gss_wrap_resp_priv(rqstp);
1878 * For any other gc_svc value, svcauth_gss_accept() already set
1879 * the auth_error appropriately; just fall through:
1886 if (rqstp->rq_client)
1887 auth_domain_put(rqstp->rq_client);
1888 rqstp->rq_client = NULL;
1889 if (rqstp->rq_gssclient)
1890 auth_domain_put(rqstp->rq_gssclient);
1891 rqstp->rq_gssclient = NULL;
1892 if (rqstp->rq_cred.cr_group_info)
1893 put_group_info(rqstp->rq_cred.cr_group_info);
1894 rqstp->rq_cred.cr_group_info = NULL;
1895 if (gsd && gsd->rsci) {
1896 cache_put(&gsd->rsci->h, sn->rsc_cache);
1903 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1905 struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1906 struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1913 svcauth_gss_domain_release(struct auth_domain *dom)
1915 call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1918 static struct auth_ops svcauthops_gss = {
1919 .name = "rpcsec_gss",
1920 .owner = THIS_MODULE,
1921 .flavour = RPC_AUTH_GSS,
1922 .accept = svcauth_gss_accept,
1923 .release = svcauth_gss_release,
1924 .domain_release = svcauth_gss_domain_release,
1925 .set_client = svcauth_gss_set_client,
1928 static int rsi_cache_create_net(struct net *net)
1930 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1931 struct cache_detail *cd;
1934 cd = cache_create_net(&rsi_cache_template, net);
1937 err = cache_register_net(cd, net);
1939 cache_destroy_net(cd, net);
1946 static void rsi_cache_destroy_net(struct net *net)
1948 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1949 struct cache_detail *cd = sn->rsi_cache;
1951 sn->rsi_cache = NULL;
1953 cache_unregister_net(cd, net);
1954 cache_destroy_net(cd, net);
1957 static int rsc_cache_create_net(struct net *net)
1959 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1960 struct cache_detail *cd;
1963 cd = cache_create_net(&rsc_cache_template, net);
1966 err = cache_register_net(cd, net);
1968 cache_destroy_net(cd, net);
1975 static void rsc_cache_destroy_net(struct net *net)
1977 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1978 struct cache_detail *cd = sn->rsc_cache;
1980 sn->rsc_cache = NULL;
1982 cache_unregister_net(cd, net);
1983 cache_destroy_net(cd, net);
1987 gss_svc_init_net(struct net *net)
1991 rv = rsc_cache_create_net(net);
1994 rv = rsi_cache_create_net(net);
1997 rv = create_use_gss_proxy_proc_entry(net);
2002 rsi_cache_destroy_net(net);
2004 rsc_cache_destroy_net(net);
2009 gss_svc_shutdown_net(struct net *net)
2011 destroy_use_gss_proxy_proc_entry(net);
2012 rsi_cache_destroy_net(net);
2013 rsc_cache_destroy_net(net);
2019 return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
2023 gss_svc_shutdown(void)
2025 svc_auth_unregister(RPC_AUTH_GSS);