2 * linux/net/sunrpc/auth_gss/auth_gss.c
4 * RPCSEC_GSS client authentication.
6 * Copyright (c) 2000 The Regents of the University of Michigan.
9 * Dug Song <dugsong@monkey.org>
10 * Andy Adamson <andros@umich.edu>
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/types.h>
42 #include <linux/slab.h>
43 #include <linux/sched.h>
44 #include <linux/pagemap.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/sunrpc/auth.h>
47 #include <linux/sunrpc/auth_gss.h>
48 #include <linux/sunrpc/svcauth_gss.h>
49 #include <linux/sunrpc/gss_err.h>
50 #include <linux/workqueue.h>
51 #include <linux/sunrpc/rpc_pipe_fs.h>
52 #include <linux/sunrpc/gss_api.h>
53 #include <asm/uaccess.h>
55 static const struct rpc_authops authgss_ops;
57 static const struct rpc_credops gss_credops;
58 static const struct rpc_credops gss_nullops;
61 # define RPCDBG_FACILITY RPCDBG_AUTH
64 #define GSS_CRED_SLACK 1024
65 /* length of a krb5 verifier (48), plus data added before arguments when
66 * using integrity (two 4-byte integers): */
67 #define GSS_VERF_SLACK 100
71 struct rpc_auth rpc_auth;
72 struct gss_api_mech *mech;
73 enum rpc_gss_svc service;
74 struct rpc_clnt *client;
76 * There are two upcall pipes; dentry[1], named "gssd", is used
77 * for the new text-based upcall; dentry[0] is named after the
78 * mechanism (for example, "krb5") and exists for
79 * backwards-compatibility with older gssd's.
81 struct dentry *dentry[2];
84 /* pipe_version >= 0 if and only if someone has a pipe open. */
85 static int pipe_version = -1;
86 static atomic_t pipe_users = ATOMIC_INIT(0);
87 static DEFINE_SPINLOCK(pipe_version_lock);
88 static struct rpc_wait_queue pipe_version_rpc_waitqueue;
89 static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
91 static void gss_free_ctx(struct gss_cl_ctx *);
92 static const struct rpc_pipe_ops gss_upcall_ops_v0;
93 static const struct rpc_pipe_ops gss_upcall_ops_v1;
95 static inline struct gss_cl_ctx *
96 gss_get_ctx(struct gss_cl_ctx *ctx)
98 atomic_inc(&ctx->count);
103 gss_put_ctx(struct gss_cl_ctx *ctx)
105 if (atomic_dec_and_test(&ctx->count))
110 * called by gss_upcall_callback and gss_create_upcall in order
111 * to set the gss context. The actual exchange of an old context
112 * and a new one is protected by the inode->i_lock.
115 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
117 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
119 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
122 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
123 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
124 smp_mb__before_clear_bit();
125 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
129 simple_get_bytes(const void *p, const void *end, void *res, size_t len)
131 const void *q = (const void *)((const char *)p + len);
132 if (unlikely(q > end || q < p))
133 return ERR_PTR(-EFAULT);
138 static inline const void *
139 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
144 p = simple_get_bytes(p, end, &len, sizeof(len));
147 q = (const void *)((const char *)p + len);
148 if (unlikely(q > end || q < p))
149 return ERR_PTR(-EFAULT);
150 dest->data = kmemdup(p, len, GFP_NOFS);
151 if (unlikely(dest->data == NULL))
152 return ERR_PTR(-ENOMEM);
157 static struct gss_cl_ctx *
158 gss_cred_get_ctx(struct rpc_cred *cred)
160 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
161 struct gss_cl_ctx *ctx = NULL;
164 if (gss_cred->gc_ctx)
165 ctx = gss_get_ctx(gss_cred->gc_ctx);
170 static struct gss_cl_ctx *
171 gss_alloc_context(void)
173 struct gss_cl_ctx *ctx;
175 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
177 ctx->gc_proc = RPC_GSS_PROC_DATA;
178 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
179 spin_lock_init(&ctx->gc_seq_lock);
180 atomic_set(&ctx->count,1);
185 #define GSSD_MIN_TIMEOUT (60 * 60)
187 gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
191 unsigned int timeout;
195 /* First unsigned int gives the lifetime (in seconds) of the cred */
196 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
200 timeout = GSSD_MIN_TIMEOUT;
201 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
202 /* Sequence number window. Determines the maximum number of simultaneous requests */
203 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
206 ctx->gc_win = window_size;
207 /* gssd signals an error by passing ctx->gc_win = 0: */
208 if (ctx->gc_win == 0) {
209 /* in which case, p points to an error code which we ignore */
210 p = ERR_PTR(-EACCES);
213 /* copy the opaque wire context */
214 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
217 /* import the opaque security context */
218 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
221 q = (const void *)((const char *)p + seclen);
222 if (unlikely(q > end || q < p)) {
223 p = ERR_PTR(-EFAULT);
226 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
233 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p));
237 #define UPCALL_BUF_LEN 128
239 struct gss_upcall_msg {
242 struct rpc_pipe_msg msg;
243 struct list_head list;
244 struct gss_auth *auth;
245 struct rpc_inode *inode;
246 struct rpc_wait_queue rpc_waitqueue;
247 wait_queue_head_t waitqueue;
248 struct gss_cl_ctx *ctx;
249 char databuf[UPCALL_BUF_LEN];
252 static int get_pipe_version(void)
256 spin_lock(&pipe_version_lock);
257 if (pipe_version >= 0) {
258 atomic_inc(&pipe_users);
262 spin_unlock(&pipe_version_lock);
266 static void put_pipe_version(void)
268 if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) {
270 spin_unlock(&pipe_version_lock);
275 gss_release_msg(struct gss_upcall_msg *gss_msg)
277 if (!atomic_dec_and_test(&gss_msg->count))
280 BUG_ON(!list_empty(&gss_msg->list));
281 if (gss_msg->ctx != NULL)
282 gss_put_ctx(gss_msg->ctx);
283 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
287 static struct gss_upcall_msg *
288 __gss_find_upcall(struct rpc_inode *rpci, uid_t uid)
290 struct gss_upcall_msg *pos;
291 list_for_each_entry(pos, &rpci->in_downcall, list) {
294 atomic_inc(&pos->count);
295 dprintk("RPC: gss_find_upcall found msg %p\n", pos);
298 dprintk("RPC: gss_find_upcall found nothing\n");
302 /* Try to add an upcall to the pipefs queue.
303 * If an upcall owned by our uid already exists, then we return a reference
304 * to that upcall instead of adding the new upcall.
306 static inline struct gss_upcall_msg *
307 gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
309 struct rpc_inode *rpci = gss_msg->inode;
310 struct inode *inode = &rpci->vfs_inode;
311 struct gss_upcall_msg *old;
313 spin_lock(&inode->i_lock);
314 old = __gss_find_upcall(rpci, gss_msg->uid);
316 atomic_inc(&gss_msg->count);
317 list_add(&gss_msg->list, &rpci->in_downcall);
320 spin_unlock(&inode->i_lock);
325 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
327 list_del_init(&gss_msg->list);
328 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
329 wake_up_all(&gss_msg->waitqueue);
330 atomic_dec(&gss_msg->count);
334 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
336 struct inode *inode = &gss_msg->inode->vfs_inode;
338 if (list_empty(&gss_msg->list))
340 spin_lock(&inode->i_lock);
341 if (!list_empty(&gss_msg->list))
342 __gss_unhash_msg(gss_msg);
343 spin_unlock(&inode->i_lock);
347 gss_upcall_callback(struct rpc_task *task)
349 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
350 struct gss_cred, gc_base);
351 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
352 struct inode *inode = &gss_msg->inode->vfs_inode;
354 spin_lock(&inode->i_lock);
356 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
358 task->tk_status = gss_msg->msg.errno;
359 gss_cred->gc_upcall = NULL;
360 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
361 spin_unlock(&inode->i_lock);
362 gss_release_msg(gss_msg);
365 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
367 gss_msg->msg.data = &gss_msg->uid;
368 gss_msg->msg.len = sizeof(gss_msg->uid);
371 static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
372 struct rpc_clnt *clnt, int machine_cred)
374 char *p = gss_msg->databuf;
377 gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ",
378 gss_msg->auth->mech->gm_name,
380 p += gss_msg->msg.len;
381 if (clnt->cl_principal) {
382 len = sprintf(p, "target=%s ", clnt->cl_principal);
384 gss_msg->msg.len += len;
387 len = sprintf(p, "service=* ");
389 gss_msg->msg.len += len;
390 } else if (!strcmp(clnt->cl_program->name, "nfs4_cb")) {
391 len = sprintf(p, "service=nfs ");
393 gss_msg->msg.len += len;
395 len = sprintf(p, "\n");
396 gss_msg->msg.len += len;
398 gss_msg->msg.data = gss_msg->databuf;
399 BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN);
402 static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
403 struct rpc_clnt *clnt, int machine_cred)
405 if (pipe_version == 0)
406 gss_encode_v0_msg(gss_msg);
407 else /* pipe_version == 1 */
408 gss_encode_v1_msg(gss_msg, clnt, machine_cred);
411 static inline struct gss_upcall_msg *
412 gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid, struct rpc_clnt *clnt,
415 struct gss_upcall_msg *gss_msg;
418 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
420 return ERR_PTR(-ENOMEM);
421 vers = get_pipe_version();
424 return ERR_PTR(vers);
426 gss_msg->inode = RPC_I(gss_auth->dentry[vers]->d_inode);
427 INIT_LIST_HEAD(&gss_msg->list);
428 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
429 init_waitqueue_head(&gss_msg->waitqueue);
430 atomic_set(&gss_msg->count, 1);
432 gss_msg->auth = gss_auth;
433 gss_encode_msg(gss_msg, clnt, machine_cred);
437 static struct gss_upcall_msg *
438 gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
440 struct gss_cred *gss_cred = container_of(cred,
441 struct gss_cred, gc_base);
442 struct gss_upcall_msg *gss_new, *gss_msg;
443 uid_t uid = cred->cr_uid;
445 gss_new = gss_alloc_msg(gss_auth, uid, clnt, gss_cred->gc_machine_cred);
448 gss_msg = gss_add_msg(gss_auth, gss_new);
449 if (gss_msg == gss_new) {
450 struct inode *inode = &gss_new->inode->vfs_inode;
451 int res = rpc_queue_upcall(inode, &gss_new->msg);
453 gss_unhash_msg(gss_new);
454 gss_msg = ERR_PTR(res);
457 gss_release_msg(gss_new);
461 static void warn_gssd(void)
463 static unsigned long ratelimit;
464 unsigned long now = jiffies;
466 if (time_after(now, ratelimit)) {
467 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
468 "Please check user daemon is running.\n");
469 ratelimit = now + 15*HZ;
474 gss_refresh_upcall(struct rpc_task *task)
476 struct rpc_cred *cred = task->tk_msg.rpc_cred;
477 struct gss_auth *gss_auth = container_of(cred->cr_auth,
478 struct gss_auth, rpc_auth);
479 struct gss_cred *gss_cred = container_of(cred,
480 struct gss_cred, gc_base);
481 struct gss_upcall_msg *gss_msg;
485 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid,
487 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
488 if (PTR_ERR(gss_msg) == -EAGAIN) {
489 /* XXX: warning on the first, under the assumption we
490 * shouldn't normally hit this case on a refresh. */
492 task->tk_timeout = 15*HZ;
493 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
496 if (IS_ERR(gss_msg)) {
497 err = PTR_ERR(gss_msg);
500 inode = &gss_msg->inode->vfs_inode;
501 spin_lock(&inode->i_lock);
502 if (gss_cred->gc_upcall != NULL)
503 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
504 else if (gss_msg->ctx != NULL) {
505 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
506 gss_cred->gc_upcall = NULL;
507 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
508 } else if (gss_msg->msg.errno >= 0) {
509 task->tk_timeout = 0;
510 gss_cred->gc_upcall = gss_msg;
511 /* gss_upcall_callback will release the reference to gss_upcall_msg */
512 atomic_inc(&gss_msg->count);
513 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
515 err = gss_msg->msg.errno;
516 spin_unlock(&inode->i_lock);
517 gss_release_msg(gss_msg);
519 dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
520 task->tk_pid, cred->cr_uid, err);
525 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
528 struct rpc_cred *cred = &gss_cred->gc_base;
529 struct gss_upcall_msg *gss_msg;
533 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
535 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
536 if (PTR_ERR(gss_msg) == -EAGAIN) {
537 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
538 pipe_version >= 0, 15*HZ);
541 if (pipe_version < 0)
545 if (IS_ERR(gss_msg)) {
546 err = PTR_ERR(gss_msg);
549 inode = &gss_msg->inode->vfs_inode;
551 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
552 spin_lock(&inode->i_lock);
553 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
556 spin_unlock(&inode->i_lock);
564 gss_cred_set_ctx(cred, gss_msg->ctx);
566 err = gss_msg->msg.errno;
567 spin_unlock(&inode->i_lock);
569 finish_wait(&gss_msg->waitqueue, &wait);
570 gss_release_msg(gss_msg);
572 dprintk("RPC: gss_create_upcall for uid %u result %d\n",
578 gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
579 char __user *dst, size_t buflen)
581 char *data = (char *)msg->data + msg->copied;
582 size_t mlen = min(msg->len, buflen);
585 left = copy_to_user(dst, data, mlen);
587 msg->errno = -EFAULT;
597 #define MSG_BUF_MAXSIZE 1024
600 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
604 struct gss_upcall_msg *gss_msg;
605 struct inode *inode = filp->f_path.dentry->d_inode;
606 struct gss_cl_ctx *ctx;
608 ssize_t err = -EFBIG;
610 if (mlen > MSG_BUF_MAXSIZE)
613 buf = kmalloc(mlen, GFP_NOFS);
618 if (copy_from_user(buf, src, mlen))
621 end = (const void *)((char *)buf + mlen);
622 p = simple_get_bytes(buf, end, &uid, sizeof(uid));
629 ctx = gss_alloc_context();
634 /* Find a matching upcall */
635 spin_lock(&inode->i_lock);
636 gss_msg = __gss_find_upcall(RPC_I(inode), uid);
637 if (gss_msg == NULL) {
638 spin_unlock(&inode->i_lock);
641 list_del_init(&gss_msg->list);
642 spin_unlock(&inode->i_lock);
644 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
649 gss_msg->msg.errno = err;
656 gss_msg->msg.errno = -EAGAIN;
659 printk(KERN_CRIT "%s: bad return from "
660 "gss_fill_context: %ld\n", __func__, err);
663 goto err_release_msg;
665 gss_msg->ctx = gss_get_ctx(ctx);
669 spin_lock(&inode->i_lock);
670 __gss_unhash_msg(gss_msg);
671 spin_unlock(&inode->i_lock);
672 gss_release_msg(gss_msg);
678 dprintk("RPC: gss_pipe_downcall returning %Zd\n", err);
682 static int gss_pipe_open(struct inode *inode, int new_version)
686 spin_lock(&pipe_version_lock);
687 if (pipe_version < 0) {
688 /* First open of any gss pipe determines the version: */
689 pipe_version = new_version;
690 rpc_wake_up(&pipe_version_rpc_waitqueue);
691 wake_up(&pipe_version_waitqueue);
692 } else if (pipe_version != new_version) {
693 /* Trying to open a pipe of a different version */
697 atomic_inc(&pipe_users);
699 spin_unlock(&pipe_version_lock);
704 static int gss_pipe_open_v0(struct inode *inode)
706 return gss_pipe_open(inode, 0);
709 static int gss_pipe_open_v1(struct inode *inode)
711 return gss_pipe_open(inode, 1);
715 gss_pipe_release(struct inode *inode)
717 struct rpc_inode *rpci = RPC_I(inode);
718 struct gss_upcall_msg *gss_msg;
720 spin_lock(&inode->i_lock);
721 while (!list_empty(&rpci->in_downcall)) {
723 gss_msg = list_entry(rpci->in_downcall.next,
724 struct gss_upcall_msg, list);
725 gss_msg->msg.errno = -EPIPE;
726 atomic_inc(&gss_msg->count);
727 __gss_unhash_msg(gss_msg);
728 spin_unlock(&inode->i_lock);
729 gss_release_msg(gss_msg);
730 spin_lock(&inode->i_lock);
732 spin_unlock(&inode->i_lock);
738 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
740 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
742 if (msg->errno < 0) {
743 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
745 atomic_inc(&gss_msg->count);
746 gss_unhash_msg(gss_msg);
747 if (msg->errno == -ETIMEDOUT)
749 gss_release_msg(gss_msg);
754 * NOTE: we have the opportunity to use different
755 * parameters based on the input flavor (which must be a pseudoflavor)
757 static struct rpc_auth *
758 gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
760 struct gss_auth *gss_auth;
761 struct rpc_auth * auth;
762 int err = -ENOMEM; /* XXX? */
764 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
766 if (!try_module_get(THIS_MODULE))
768 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
770 gss_auth->client = clnt;
772 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
773 if (!gss_auth->mech) {
774 printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
778 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
779 if (gss_auth->service == 0)
781 auth = &gss_auth->rpc_auth;
782 auth->au_cslack = GSS_CRED_SLACK >> 2;
783 auth->au_rslack = GSS_VERF_SLACK >> 2;
784 auth->au_ops = &authgss_ops;
785 auth->au_flavor = flavor;
786 atomic_set(&auth->au_count, 1);
787 kref_init(&gss_auth->kref);
790 * Note: if we created the old pipe first, then someone who
791 * examined the directory at the right moment might conclude
792 * that we supported only the old pipe. So we instead create
793 * the new pipe first.
795 gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry,
797 clnt, &gss_upcall_ops_v1,
798 RPC_PIPE_WAIT_FOR_OPEN);
799 if (IS_ERR(gss_auth->dentry[1])) {
800 err = PTR_ERR(gss_auth->dentry[1]);
804 gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry,
805 gss_auth->mech->gm_name,
806 clnt, &gss_upcall_ops_v0,
807 RPC_PIPE_WAIT_FOR_OPEN);
808 if (IS_ERR(gss_auth->dentry[0])) {
809 err = PTR_ERR(gss_auth->dentry[0]);
810 goto err_unlink_pipe_1;
812 err = rpcauth_init_credcache(auth);
814 goto err_unlink_pipe_0;
818 rpc_unlink(gss_auth->dentry[0]);
820 rpc_unlink(gss_auth->dentry[1]);
822 gss_mech_put(gss_auth->mech);
826 module_put(THIS_MODULE);
831 gss_free(struct gss_auth *gss_auth)
833 rpc_unlink(gss_auth->dentry[1]);
834 rpc_unlink(gss_auth->dentry[0]);
835 gss_mech_put(gss_auth->mech);
838 module_put(THIS_MODULE);
842 gss_free_callback(struct kref *kref)
844 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
850 gss_destroy(struct rpc_auth *auth)
852 struct gss_auth *gss_auth;
854 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
855 auth, auth->au_flavor);
857 rpcauth_destroy_credcache(auth);
859 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
860 kref_put(&gss_auth->kref, gss_free_callback);
864 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
865 * to the server with the GSS control procedure field set to
866 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
867 * all RPCSEC_GSS state associated with that context.
870 gss_destroying_context(struct rpc_cred *cred)
872 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
873 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
874 struct rpc_task *task;
876 if (gss_cred->gc_ctx == NULL ||
877 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
880 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
881 cred->cr_ops = &gss_nullops;
883 /* Take a reference to ensure the cred will be destroyed either
884 * by the RPC call or by the put_rpccred() below */
887 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
895 /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
896 * to create a new cred or context, so they check that things have been
897 * allocated before freeing them. */
899 gss_do_free_ctx(struct gss_cl_ctx *ctx)
901 dprintk("RPC: gss_free_ctx\n");
903 kfree(ctx->gc_wire_ctx.data);
908 gss_free_ctx_callback(struct rcu_head *head)
910 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
911 gss_do_free_ctx(ctx);
915 gss_free_ctx(struct gss_cl_ctx *ctx)
917 struct gss_ctx *gc_gss_ctx;
919 gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx);
920 rcu_assign_pointer(ctx->gc_gss_ctx, NULL);
921 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
923 gss_delete_sec_context(&gc_gss_ctx);
927 gss_free_cred(struct gss_cred *gss_cred)
929 dprintk("RPC: gss_free_cred %p\n", gss_cred);
934 gss_free_cred_callback(struct rcu_head *head)
936 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
937 gss_free_cred(gss_cred);
941 gss_destroy_nullcred(struct rpc_cred *cred)
943 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
944 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
945 struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
947 rcu_assign_pointer(gss_cred->gc_ctx, NULL);
948 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
951 kref_put(&gss_auth->kref, gss_free_callback);
955 gss_destroy_cred(struct rpc_cred *cred)
958 if (gss_destroying_context(cred))
960 gss_destroy_nullcred(cred);
964 * Lookup RPCSEC_GSS cred for the current process
966 static struct rpc_cred *
967 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
969 return rpcauth_lookup_credcache(auth, acred, flags);
972 static struct rpc_cred *
973 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
975 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
976 struct gss_cred *cred = NULL;
979 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
980 acred->uid, auth->au_flavor);
982 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
985 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
987 * Note: in order to force a call to call_refresh(), we deliberately
988 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
990 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
991 cred->gc_service = gss_auth->service;
992 cred->gc_machine_cred = acred->machine_cred;
993 kref_get(&gss_auth->kref);
994 return &cred->gc_base;
997 dprintk("RPC: gss_create_cred failed with error %d\n", err);
1002 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1004 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1005 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1009 err = gss_create_upcall(gss_auth, gss_cred);
1010 } while (err == -EAGAIN);
1015 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1017 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1019 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1021 /* Don't match with creds that have expired. */
1022 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
1024 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1027 if (acred->machine_cred != gss_cred->gc_machine_cred)
1029 return (rc->cr_uid == acred->uid);
1033 * Marshal credentials.
1034 * Maybe we should keep a cached credential for performance reasons.
1037 gss_marshal(struct rpc_task *task, __be32 *p)
1039 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1040 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1042 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1044 struct rpc_rqst *req = task->tk_rqstp;
1046 struct xdr_netobj mic;
1048 struct xdr_buf verf_buf;
1050 dprintk("RPC: %5u gss_marshal\n", task->tk_pid);
1052 *p++ = htonl(RPC_AUTH_GSS);
1055 spin_lock(&ctx->gc_seq_lock);
1056 req->rq_seqno = ctx->gc_seq++;
1057 spin_unlock(&ctx->gc_seq_lock);
1059 *p++ = htonl((u32) RPC_GSS_VERSION);
1060 *p++ = htonl((u32) ctx->gc_proc);
1061 *p++ = htonl((u32) req->rq_seqno);
1062 *p++ = htonl((u32) gss_cred->gc_service);
1063 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1064 *cred_len = htonl((p - (cred_len + 1)) << 2);
1066 /* We compute the checksum for the verifier over the xdr-encoded bytes
1067 * starting with the xid and ending at the end of the credential: */
1068 iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
1069 req->rq_snd_buf.head[0].iov_base);
1070 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1071 xdr_buf_from_iov(&iov, &verf_buf);
1073 /* set verifier flavor*/
1074 *p++ = htonl(RPC_AUTH_GSS);
1076 mic.data = (u8 *)(p + 1);
1077 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1078 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1079 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1080 } else if (maj_stat != 0) {
1081 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1084 p = xdr_encode_opaque(p, NULL, mic.len);
1092 static int gss_renew_cred(struct rpc_task *task)
1094 struct rpc_cred *oldcred = task->tk_msg.rpc_cred;
1095 struct gss_cred *gss_cred = container_of(oldcred,
1098 struct rpc_auth *auth = oldcred->cr_auth;
1099 struct auth_cred acred = {
1100 .uid = oldcred->cr_uid,
1101 .machine_cred = gss_cred->gc_machine_cred,
1103 struct rpc_cred *new;
1105 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1107 return PTR_ERR(new);
1108 task->tk_msg.rpc_cred = new;
1109 put_rpccred(oldcred);
1114 * Refresh credentials. XXX - finish
1117 gss_refresh(struct rpc_task *task)
1119 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1122 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1123 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1124 ret = gss_renew_cred(task);
1127 cred = task->tk_msg.rpc_cred;
1130 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1131 ret = gss_refresh_upcall(task);
1136 /* Dummy refresh routine: used only when destroying the context */
1138 gss_refresh_null(struct rpc_task *task)
1144 gss_validate(struct rpc_task *task, __be32 *p)
1146 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1147 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1150 struct xdr_buf verf_buf;
1151 struct xdr_netobj mic;
1155 dprintk("RPC: %5u gss_validate\n", task->tk_pid);
1158 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1160 if (flav != RPC_AUTH_GSS)
1162 seq = htonl(task->tk_rqstp->rq_seqno);
1163 iov.iov_base = &seq;
1164 iov.iov_len = sizeof(seq);
1165 xdr_buf_from_iov(&iov, &verf_buf);
1169 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1170 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1171 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1173 dprintk("RPC: %5u gss_validate: gss_verify_mic returned "
1174 "error 0x%08x\n", task->tk_pid, maj_stat);
1177 /* We leave it to unwrap to calculate au_rslack. For now we just
1178 * calculate the length of the verifier: */
1179 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1181 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n",
1183 return p + XDR_QUADLEN(len);
1186 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid);
1191 gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1192 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
1194 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1195 struct xdr_buf integ_buf;
1196 __be32 *integ_len = NULL;
1197 struct xdr_netobj mic;
1205 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1206 *p++ = htonl(rqstp->rq_seqno);
1208 status = encode(rqstp, p, obj);
1212 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1213 offset, snd_buf->len - offset))
1215 *integ_len = htonl(integ_buf.len);
1217 /* guess whether we're in the head or the tail: */
1218 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1219 iov = snd_buf->tail;
1221 iov = snd_buf->head;
1222 p = iov->iov_base + iov->iov_len;
1223 mic.data = (u8 *)(p + 1);
1225 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1226 status = -EIO; /* XXX? */
1227 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1228 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1231 q = xdr_encode_opaque(p, NULL, mic.len);
1233 offset = (u8 *)q - (u8 *)p;
1234 iov->iov_len += offset;
1235 snd_buf->len += offset;
1240 priv_release_snd_buf(struct rpc_rqst *rqstp)
1244 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1245 __free_page(rqstp->rq_enc_pages[i]);
1246 kfree(rqstp->rq_enc_pages);
1250 alloc_enc_pages(struct rpc_rqst *rqstp)
1252 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1255 if (snd_buf->page_len == 0) {
1256 rqstp->rq_enc_pages_num = 0;
1260 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1261 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1262 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1264 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1266 if (!rqstp->rq_enc_pages)
1268 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1269 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1270 if (rqstp->rq_enc_pages[i] == NULL)
1273 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1276 rqstp->rq_enc_pages_num = i;
1277 priv_release_snd_buf(rqstp);
1283 gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1284 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
1286 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1291 struct page **inpages;
1298 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1299 *p++ = htonl(rqstp->rq_seqno);
1301 status = encode(rqstp, p, obj);
1305 status = alloc_enc_pages(rqstp);
1308 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1309 inpages = snd_buf->pages + first;
1310 snd_buf->pages = rqstp->rq_enc_pages;
1311 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1312 /* Give the tail its own page, in case we need extra space in the
1313 * head when wrapping: */
1314 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1315 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1316 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1317 snd_buf->tail[0].iov_base = tmp;
1319 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1320 /* RPC_SLACK_SPACE should prevent this ever happening: */
1321 BUG_ON(snd_buf->len > snd_buf->buflen);
1323 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1324 * done anyway, so it's safe to put the request on the wire: */
1325 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1326 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1330 *opaque_len = htonl(snd_buf->len - offset);
1331 /* guess whether we're in the head or the tail: */
1332 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1333 iov = snd_buf->tail;
1335 iov = snd_buf->head;
1336 p = iov->iov_base + iov->iov_len;
1337 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1339 iov->iov_len += pad;
1340 snd_buf->len += pad;
1346 gss_wrap_req(struct rpc_task *task,
1347 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj)
1349 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1350 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1352 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1355 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid);
1356 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1357 /* The spec seems a little ambiguous here, but I think that not
1358 * wrapping context destruction requests makes the most sense.
1360 status = encode(rqstp, p, obj);
1363 switch (gss_cred->gc_service) {
1364 case RPC_GSS_SVC_NONE:
1365 status = encode(rqstp, p, obj);
1367 case RPC_GSS_SVC_INTEGRITY:
1368 status = gss_wrap_req_integ(cred, ctx, encode,
1371 case RPC_GSS_SVC_PRIVACY:
1372 status = gss_wrap_req_priv(cred, ctx, encode,
1378 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status);
1383 gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1384 struct rpc_rqst *rqstp, __be32 **p)
1386 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1387 struct xdr_buf integ_buf;
1388 struct xdr_netobj mic;
1389 u32 data_offset, mic_offset;
1394 integ_len = ntohl(*(*p)++);
1397 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1398 mic_offset = integ_len + data_offset;
1399 if (mic_offset > rcv_buf->len)
1401 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1404 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1405 mic_offset - data_offset))
1408 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1411 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1412 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1413 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1414 if (maj_stat != GSS_S_COMPLETE)
1420 gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1421 struct rpc_rqst *rqstp, __be32 **p)
1423 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1429 opaque_len = ntohl(*(*p)++);
1430 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1431 if (offset + opaque_len > rcv_buf->len)
1433 /* remove padding: */
1434 rcv_buf->len = offset + opaque_len;
1436 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1437 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1438 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1439 if (maj_stat != GSS_S_COMPLETE)
1441 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1449 gss_unwrap_resp(struct rpc_task *task,
1450 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj)
1452 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1453 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1455 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1457 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1458 int savedlen = head->iov_len;
1461 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1463 switch (gss_cred->gc_service) {
1464 case RPC_GSS_SVC_NONE:
1466 case RPC_GSS_SVC_INTEGRITY:
1467 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1471 case RPC_GSS_SVC_PRIVACY:
1472 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1477 /* take into account extra slack for integrity and privacy cases: */
1478 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1479 + (savedlen - head->iov_len);
1481 status = decode(rqstp, p, obj);
1484 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,
1489 static const struct rpc_authops authgss_ops = {
1490 .owner = THIS_MODULE,
1491 .au_flavor = RPC_AUTH_GSS,
1492 .au_name = "RPCSEC_GSS",
1493 .create = gss_create,
1494 .destroy = gss_destroy,
1495 .lookup_cred = gss_lookup_cred,
1496 .crcreate = gss_create_cred
1499 static const struct rpc_credops gss_credops = {
1500 .cr_name = "AUTH_GSS",
1501 .crdestroy = gss_destroy_cred,
1502 .cr_init = gss_cred_init,
1503 .crbind = rpcauth_generic_bind_cred,
1504 .crmatch = gss_match,
1505 .crmarshal = gss_marshal,
1506 .crrefresh = gss_refresh,
1507 .crvalidate = gss_validate,
1508 .crwrap_req = gss_wrap_req,
1509 .crunwrap_resp = gss_unwrap_resp,
1512 static const struct rpc_credops gss_nullops = {
1513 .cr_name = "AUTH_GSS",
1514 .crdestroy = gss_destroy_nullcred,
1515 .crbind = rpcauth_generic_bind_cred,
1516 .crmatch = gss_match,
1517 .crmarshal = gss_marshal,
1518 .crrefresh = gss_refresh_null,
1519 .crvalidate = gss_validate,
1520 .crwrap_req = gss_wrap_req,
1521 .crunwrap_resp = gss_unwrap_resp,
1524 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
1525 .upcall = gss_pipe_upcall,
1526 .downcall = gss_pipe_downcall,
1527 .destroy_msg = gss_pipe_destroy_msg,
1528 .open_pipe = gss_pipe_open_v0,
1529 .release_pipe = gss_pipe_release,
1532 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
1533 .upcall = gss_pipe_upcall,
1534 .downcall = gss_pipe_downcall,
1535 .destroy_msg = gss_pipe_destroy_msg,
1536 .open_pipe = gss_pipe_open_v1,
1537 .release_pipe = gss_pipe_release,
1541 * Initialize RPCSEC_GSS module
1543 static int __init init_rpcsec_gss(void)
1547 err = rpcauth_register(&authgss_ops);
1550 err = gss_svc_init();
1552 goto out_unregister;
1553 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
1556 rpcauth_unregister(&authgss_ops);
1561 static void __exit exit_rpcsec_gss(void)
1564 rpcauth_unregister(&authgss_ops);
1565 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1568 MODULE_LICENSE("GPL");
1569 module_init(init_rpcsec_gss)
1570 module_exit(exit_rpcsec_gss)