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;
60 #define GSS_RETRY_EXPIRED 5
61 static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
64 # define RPCDBG_FACILITY RPCDBG_AUTH
67 #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2)
68 /* length of a krb5 verifier (48), plus data added before arguments when
69 * using integrity (two 4-byte integers): */
70 #define GSS_VERF_SLACK 100
74 struct rpc_auth rpc_auth;
75 struct gss_api_mech *mech;
76 enum rpc_gss_svc service;
77 struct rpc_clnt *client;
79 * There are two upcall pipes; dentry[1], named "gssd", is used
80 * for the new text-based upcall; dentry[0] is named after the
81 * mechanism (for example, "krb5") and exists for
82 * backwards-compatibility with older gssd's.
84 struct rpc_pipe *pipe[2];
87 /* pipe_version >= 0 if and only if someone has a pipe open. */
88 static int pipe_version = -1;
89 static atomic_t pipe_users = ATOMIC_INIT(0);
90 static DEFINE_SPINLOCK(pipe_version_lock);
91 static struct rpc_wait_queue pipe_version_rpc_waitqueue;
92 static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
94 static void gss_free_ctx(struct gss_cl_ctx *);
95 static const struct rpc_pipe_ops gss_upcall_ops_v0;
96 static const struct rpc_pipe_ops gss_upcall_ops_v1;
98 static inline struct gss_cl_ctx *
99 gss_get_ctx(struct gss_cl_ctx *ctx)
101 atomic_inc(&ctx->count);
106 gss_put_ctx(struct gss_cl_ctx *ctx)
108 if (atomic_dec_and_test(&ctx->count))
113 * called by gss_upcall_callback and gss_create_upcall in order
114 * to set the gss context. The actual exchange of an old context
115 * and a new one is protected by the pipe->lock.
118 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
120 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
122 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
125 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
126 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
127 smp_mb__before_clear_bit();
128 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
132 simple_get_bytes(const void *p, const void *end, void *res, size_t len)
134 const void *q = (const void *)((const char *)p + len);
135 if (unlikely(q > end || q < p))
136 return ERR_PTR(-EFAULT);
141 static inline const void *
142 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
147 p = simple_get_bytes(p, end, &len, sizeof(len));
150 q = (const void *)((const char *)p + len);
151 if (unlikely(q > end || q < p))
152 return ERR_PTR(-EFAULT);
153 dest->data = kmemdup(p, len, GFP_NOFS);
154 if (unlikely(dest->data == NULL))
155 return ERR_PTR(-ENOMEM);
160 static struct gss_cl_ctx *
161 gss_cred_get_ctx(struct rpc_cred *cred)
163 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
164 struct gss_cl_ctx *ctx = NULL;
167 if (gss_cred->gc_ctx)
168 ctx = gss_get_ctx(gss_cred->gc_ctx);
173 static struct gss_cl_ctx *
174 gss_alloc_context(void)
176 struct gss_cl_ctx *ctx;
178 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
180 ctx->gc_proc = RPC_GSS_PROC_DATA;
181 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
182 spin_lock_init(&ctx->gc_seq_lock);
183 atomic_set(&ctx->count,1);
188 #define GSSD_MIN_TIMEOUT (60 * 60)
190 gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
194 unsigned int timeout;
195 unsigned long now = jiffies;
199 /* First unsigned int gives the remaining lifetime in seconds of the
200 * credential - e.g. the remaining TGT lifetime for Kerberos or
201 * the -t value passed to GSSD.
203 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
207 timeout = GSSD_MIN_TIMEOUT;
208 ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
209 /* Sequence number window. Determines the maximum number of
210 * simultaneous requests
212 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
215 ctx->gc_win = window_size;
216 /* gssd signals an error by passing ctx->gc_win = 0: */
217 if (ctx->gc_win == 0) {
219 * in which case, p points to an error code. Anything other
220 * than -EKEYEXPIRED gets converted to -EACCES.
222 p = simple_get_bytes(p, end, &ret, sizeof(ret));
224 p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
228 /* copy the opaque wire context */
229 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
232 /* import the opaque security context */
233 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
236 q = (const void *)((const char *)p + seclen);
237 if (unlikely(q > end || q < p)) {
238 p = ERR_PTR(-EFAULT);
241 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS);
246 dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u\n",
247 __func__, ctx->gc_expiry, now, timeout);
250 dprintk("RPC: %s returns %ld gc_expiry %lu now %lu timeout %u\n",
251 __func__, -PTR_ERR(p), ctx->gc_expiry, now, timeout);
255 #define UPCALL_BUF_LEN 128
257 struct gss_upcall_msg {
260 struct rpc_pipe_msg msg;
261 struct list_head list;
262 struct gss_auth *auth;
263 struct rpc_pipe *pipe;
264 struct rpc_wait_queue rpc_waitqueue;
265 wait_queue_head_t waitqueue;
266 struct gss_cl_ctx *ctx;
267 char databuf[UPCALL_BUF_LEN];
270 static int get_pipe_version(void)
274 spin_lock(&pipe_version_lock);
275 if (pipe_version >= 0) {
276 atomic_inc(&pipe_users);
280 spin_unlock(&pipe_version_lock);
284 static void put_pipe_version(void)
286 if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) {
288 spin_unlock(&pipe_version_lock);
293 gss_release_msg(struct gss_upcall_msg *gss_msg)
295 if (!atomic_dec_and_test(&gss_msg->count))
298 BUG_ON(!list_empty(&gss_msg->list));
299 if (gss_msg->ctx != NULL)
300 gss_put_ctx(gss_msg->ctx);
301 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
305 static struct gss_upcall_msg *
306 __gss_find_upcall(struct rpc_pipe *pipe, uid_t uid)
308 struct gss_upcall_msg *pos;
309 list_for_each_entry(pos, &pipe->in_downcall, list) {
312 atomic_inc(&pos->count);
313 dprintk("RPC: %s found msg %p\n", __func__, pos);
316 dprintk("RPC: %s found nothing\n", __func__);
320 /* Try to add an upcall to the pipefs queue.
321 * If an upcall owned by our uid already exists, then we return a reference
322 * to that upcall instead of adding the new upcall.
324 static inline struct gss_upcall_msg *
325 gss_add_msg(struct gss_upcall_msg *gss_msg)
327 struct rpc_pipe *pipe = gss_msg->pipe;
328 struct gss_upcall_msg *old;
330 spin_lock(&pipe->lock);
331 old = __gss_find_upcall(pipe, gss_msg->uid);
333 atomic_inc(&gss_msg->count);
334 list_add(&gss_msg->list, &pipe->in_downcall);
337 spin_unlock(&pipe->lock);
342 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
344 list_del_init(&gss_msg->list);
345 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
346 wake_up_all(&gss_msg->waitqueue);
347 atomic_dec(&gss_msg->count);
351 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
353 struct rpc_pipe *pipe = gss_msg->pipe;
355 if (list_empty(&gss_msg->list))
357 spin_lock(&pipe->lock);
358 if (!list_empty(&gss_msg->list))
359 __gss_unhash_msg(gss_msg);
360 spin_unlock(&pipe->lock);
364 gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
366 switch (gss_msg->msg.errno) {
368 if (gss_msg->ctx == NULL)
370 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
371 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
374 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
376 gss_cred->gc_upcall_timestamp = jiffies;
377 gss_cred->gc_upcall = NULL;
378 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
382 gss_upcall_callback(struct rpc_task *task)
384 struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
385 struct gss_cred, gc_base);
386 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
387 struct rpc_pipe *pipe = gss_msg->pipe;
389 spin_lock(&pipe->lock);
390 gss_handle_downcall_result(gss_cred, gss_msg);
391 spin_unlock(&pipe->lock);
392 task->tk_status = gss_msg->msg.errno;
393 gss_release_msg(gss_msg);
396 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
398 gss_msg->msg.data = &gss_msg->uid;
399 gss_msg->msg.len = sizeof(gss_msg->uid);
402 static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
403 struct rpc_clnt *clnt,
404 const char *service_name)
406 struct gss_api_mech *mech = gss_msg->auth->mech;
407 char *p = gss_msg->databuf;
410 gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ",
413 p += gss_msg->msg.len;
414 if (clnt->cl_principal) {
415 len = sprintf(p, "target=%s ", clnt->cl_principal);
417 gss_msg->msg.len += len;
419 if (service_name != NULL) {
420 len = sprintf(p, "service=%s ", service_name);
422 gss_msg->msg.len += len;
424 if (mech->gm_upcall_enctypes) {
425 len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes);
427 gss_msg->msg.len += len;
429 len = sprintf(p, "\n");
430 gss_msg->msg.len += len;
432 gss_msg->msg.data = gss_msg->databuf;
433 BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN);
436 static void gss_encode_msg(struct gss_upcall_msg *gss_msg,
437 struct rpc_clnt *clnt,
438 const char *service_name)
440 if (pipe_version == 0)
441 gss_encode_v0_msg(gss_msg);
442 else /* pipe_version == 1 */
443 gss_encode_v1_msg(gss_msg, clnt, service_name);
446 static struct gss_upcall_msg *
447 gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt,
448 uid_t uid, const char *service_name)
450 struct gss_upcall_msg *gss_msg;
453 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
455 return ERR_PTR(-ENOMEM);
456 vers = get_pipe_version();
459 return ERR_PTR(vers);
461 gss_msg->pipe = gss_auth->pipe[vers];
462 INIT_LIST_HEAD(&gss_msg->list);
463 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
464 init_waitqueue_head(&gss_msg->waitqueue);
465 atomic_set(&gss_msg->count, 1);
467 gss_msg->auth = gss_auth;
468 gss_encode_msg(gss_msg, clnt, service_name);
472 static struct gss_upcall_msg *
473 gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
475 struct gss_cred *gss_cred = container_of(cred,
476 struct gss_cred, gc_base);
477 struct gss_upcall_msg *gss_new, *gss_msg;
478 uid_t uid = cred->cr_uid;
480 gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal);
483 gss_msg = gss_add_msg(gss_new);
484 if (gss_msg == gss_new) {
485 int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
487 gss_unhash_msg(gss_new);
488 gss_msg = ERR_PTR(res);
491 gss_release_msg(gss_new);
495 static void warn_gssd(void)
497 static unsigned long ratelimit;
498 unsigned long now = jiffies;
500 if (time_after(now, ratelimit)) {
501 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
502 "Please check user daemon is running.\n");
503 ratelimit = now + 15*HZ;
508 gss_refresh_upcall(struct rpc_task *task)
510 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
511 struct gss_auth *gss_auth = container_of(cred->cr_auth,
512 struct gss_auth, rpc_auth);
513 struct gss_cred *gss_cred = container_of(cred,
514 struct gss_cred, gc_base);
515 struct gss_upcall_msg *gss_msg;
516 struct rpc_pipe *pipe;
519 dprintk("RPC: %5u %s for uid %u\n",
520 task->tk_pid, __func__, cred->cr_uid);
521 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
522 if (PTR_ERR(gss_msg) == -EAGAIN) {
523 /* XXX: warning on the first, under the assumption we
524 * shouldn't normally hit this case on a refresh. */
526 task->tk_timeout = 15*HZ;
527 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
530 if (IS_ERR(gss_msg)) {
531 err = PTR_ERR(gss_msg);
534 pipe = gss_msg->pipe;
535 spin_lock(&pipe->lock);
536 if (gss_cred->gc_upcall != NULL)
537 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
538 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
539 task->tk_timeout = 0;
540 gss_cred->gc_upcall = gss_msg;
541 /* gss_upcall_callback will release the reference to gss_upcall_msg */
542 atomic_inc(&gss_msg->count);
543 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
545 gss_handle_downcall_result(gss_cred, gss_msg);
546 err = gss_msg->msg.errno;
548 spin_unlock(&pipe->lock);
549 gss_release_msg(gss_msg);
551 dprintk("RPC: %5u %s for uid %u result %d\n",
552 task->tk_pid, __func__, cred->cr_uid, err);
557 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
559 struct rpc_pipe *pipe;
560 struct rpc_cred *cred = &gss_cred->gc_base;
561 struct gss_upcall_msg *gss_msg;
565 dprintk("RPC: %s for uid %u\n", __func__, cred->cr_uid);
567 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
568 if (PTR_ERR(gss_msg) == -EAGAIN) {
569 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
570 pipe_version >= 0, 15*HZ);
571 if (pipe_version < 0) {
579 if (IS_ERR(gss_msg)) {
580 err = PTR_ERR(gss_msg);
583 pipe = gss_msg->pipe;
585 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
586 spin_lock(&pipe->lock);
587 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
590 spin_unlock(&pipe->lock);
591 if (fatal_signal_pending(current)) {
598 gss_cred_set_ctx(cred, gss_msg->ctx);
600 err = gss_msg->msg.errno;
601 spin_unlock(&pipe->lock);
603 finish_wait(&gss_msg->waitqueue, &wait);
604 gss_release_msg(gss_msg);
606 dprintk("RPC: %s for uid %u result %d\n",
607 __func__, cred->cr_uid, err);
611 #define MSG_BUF_MAXSIZE 1024
614 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
618 struct gss_upcall_msg *gss_msg;
619 struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe;
620 struct gss_cl_ctx *ctx;
622 ssize_t err = -EFBIG;
624 if (mlen > MSG_BUF_MAXSIZE)
627 buf = kmalloc(mlen, GFP_NOFS);
632 if (copy_from_user(buf, src, mlen))
635 end = (const void *)((char *)buf + mlen);
636 p = simple_get_bytes(buf, end, &uid, sizeof(uid));
643 ctx = gss_alloc_context();
648 /* Find a matching upcall */
649 spin_lock(&pipe->lock);
650 gss_msg = __gss_find_upcall(pipe, uid);
651 if (gss_msg == NULL) {
652 spin_unlock(&pipe->lock);
655 list_del_init(&gss_msg->list);
656 spin_unlock(&pipe->lock);
658 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
664 gss_msg->msg.errno = err;
671 gss_msg->msg.errno = -EAGAIN;
674 printk(KERN_CRIT "%s: bad return from "
675 "gss_fill_context: %zd\n", __func__, err);
678 goto err_release_msg;
680 gss_msg->ctx = gss_get_ctx(ctx);
684 spin_lock(&pipe->lock);
685 __gss_unhash_msg(gss_msg);
686 spin_unlock(&pipe->lock);
687 gss_release_msg(gss_msg);
693 dprintk("RPC: %s returning %Zd\n", __func__, err);
697 static int gss_pipe_open(struct inode *inode, int new_version)
701 spin_lock(&pipe_version_lock);
702 if (pipe_version < 0) {
703 /* First open of any gss pipe determines the version: */
704 pipe_version = new_version;
705 rpc_wake_up(&pipe_version_rpc_waitqueue);
706 wake_up(&pipe_version_waitqueue);
707 } else if (pipe_version != new_version) {
708 /* Trying to open a pipe of a different version */
712 atomic_inc(&pipe_users);
714 spin_unlock(&pipe_version_lock);
719 static int gss_pipe_open_v0(struct inode *inode)
721 return gss_pipe_open(inode, 0);
724 static int gss_pipe_open_v1(struct inode *inode)
726 return gss_pipe_open(inode, 1);
730 gss_pipe_release(struct inode *inode)
732 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
733 struct gss_upcall_msg *gss_msg;
736 spin_lock(&pipe->lock);
737 list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
739 if (!list_empty(&gss_msg->msg.list))
741 gss_msg->msg.errno = -EPIPE;
742 atomic_inc(&gss_msg->count);
743 __gss_unhash_msg(gss_msg);
744 spin_unlock(&pipe->lock);
745 gss_release_msg(gss_msg);
748 spin_unlock(&pipe->lock);
754 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
756 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
758 if (msg->errno < 0) {
759 dprintk("RPC: %s releasing msg %p\n",
761 atomic_inc(&gss_msg->count);
762 gss_unhash_msg(gss_msg);
763 if (msg->errno == -ETIMEDOUT)
765 gss_release_msg(gss_msg);
769 static void gss_pipes_dentries_destroy(struct rpc_auth *auth)
771 struct gss_auth *gss_auth;
773 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
774 if (gss_auth->pipe[0]->dentry)
775 rpc_unlink(gss_auth->pipe[0]->dentry);
776 if (gss_auth->pipe[1]->dentry)
777 rpc_unlink(gss_auth->pipe[1]->dentry);
780 static int gss_pipes_dentries_create(struct rpc_auth *auth)
783 struct gss_auth *gss_auth;
784 struct rpc_clnt *clnt;
786 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
787 clnt = gss_auth->client;
789 gss_auth->pipe[1]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
791 clnt, gss_auth->pipe[1]);
792 if (IS_ERR(gss_auth->pipe[1]->dentry))
793 return PTR_ERR(gss_auth->pipe[1]->dentry);
794 gss_auth->pipe[0]->dentry = rpc_mkpipe_dentry(clnt->cl_dentry,
795 gss_auth->mech->gm_name,
796 clnt, gss_auth->pipe[0]);
797 if (IS_ERR(gss_auth->pipe[0]->dentry)) {
798 err = PTR_ERR(gss_auth->pipe[0]->dentry);
799 goto err_unlink_pipe_1;
804 rpc_unlink(gss_auth->pipe[1]->dentry);
808 static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
809 struct rpc_auth *auth)
811 struct net *net = rpc_net_ns(clnt);
812 struct super_block *sb;
814 sb = rpc_get_sb_net(net);
817 gss_pipes_dentries_destroy(auth);
822 static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt,
823 struct rpc_auth *auth)
825 struct net *net = rpc_net_ns(clnt);
826 struct super_block *sb;
829 sb = rpc_get_sb_net(net);
832 err = gss_pipes_dentries_create(auth);
839 * NOTE: we have the opportunity to use different
840 * parameters based on the input flavor (which must be a pseudoflavor)
842 static struct rpc_auth *
843 gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
845 struct gss_auth *gss_auth;
846 struct rpc_auth * auth;
847 int err = -ENOMEM; /* XXX? */
849 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
851 if (!try_module_get(THIS_MODULE))
853 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
855 gss_auth->client = clnt;
857 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
858 if (!gss_auth->mech) {
859 printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
863 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
864 if (gss_auth->service == 0)
866 auth = &gss_auth->rpc_auth;
867 auth->au_cslack = GSS_CRED_SLACK >> 2;
868 auth->au_rslack = GSS_VERF_SLACK >> 2;
869 auth->au_ops = &authgss_ops;
870 auth->au_flavor = flavor;
871 atomic_set(&auth->au_count, 1);
872 kref_init(&gss_auth->kref);
875 * Note: if we created the old pipe first, then someone who
876 * examined the directory at the right moment might conclude
877 * that we supported only the old pipe. So we instead create
878 * the new pipe first.
880 gss_auth->pipe[1] = rpc_mkpipe_data(&gss_upcall_ops_v1,
881 RPC_PIPE_WAIT_FOR_OPEN);
882 if (IS_ERR(gss_auth->pipe[1])) {
883 err = PTR_ERR(gss_auth->pipe[1]);
887 gss_auth->pipe[0] = rpc_mkpipe_data(&gss_upcall_ops_v0,
888 RPC_PIPE_WAIT_FOR_OPEN);
889 if (IS_ERR(gss_auth->pipe[0])) {
890 err = PTR_ERR(gss_auth->pipe[0]);
891 goto err_destroy_pipe_1;
893 err = gss_pipes_dentries_create_net(clnt, auth);
895 goto err_destroy_pipe_0;
896 err = rpcauth_init_credcache(auth);
898 goto err_unlink_pipes;
902 gss_pipes_dentries_destroy_net(clnt, auth);
904 rpc_destroy_pipe_data(gss_auth->pipe[0]);
906 rpc_destroy_pipe_data(gss_auth->pipe[1]);
908 gss_mech_put(gss_auth->mech);
912 module_put(THIS_MODULE);
917 gss_free(struct gss_auth *gss_auth)
919 gss_pipes_dentries_destroy_net(gss_auth->client, &gss_auth->rpc_auth);
920 rpc_destroy_pipe_data(gss_auth->pipe[0]);
921 rpc_destroy_pipe_data(gss_auth->pipe[1]);
922 gss_mech_put(gss_auth->mech);
925 module_put(THIS_MODULE);
929 gss_free_callback(struct kref *kref)
931 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
937 gss_destroy(struct rpc_auth *auth)
939 struct gss_auth *gss_auth;
941 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
942 auth, auth->au_flavor);
944 rpcauth_destroy_credcache(auth);
946 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
947 kref_put(&gss_auth->kref, gss_free_callback);
951 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
952 * to the server with the GSS control procedure field set to
953 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
954 * all RPCSEC_GSS state associated with that context.
957 gss_destroying_context(struct rpc_cred *cred)
959 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
960 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
961 struct rpc_task *task;
963 if (gss_cred->gc_ctx == NULL ||
964 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
967 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
968 cred->cr_ops = &gss_nullops;
970 /* Take a reference to ensure the cred will be destroyed either
971 * by the RPC call or by the put_rpccred() below */
974 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
982 /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
983 * to create a new cred or context, so they check that things have been
984 * allocated before freeing them. */
986 gss_do_free_ctx(struct gss_cl_ctx *ctx)
988 dprintk("RPC: %s\n", __func__);
990 gss_delete_sec_context(&ctx->gc_gss_ctx);
991 kfree(ctx->gc_wire_ctx.data);
996 gss_free_ctx_callback(struct rcu_head *head)
998 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
999 gss_do_free_ctx(ctx);
1003 gss_free_ctx(struct gss_cl_ctx *ctx)
1005 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1009 gss_free_cred(struct gss_cred *gss_cred)
1011 dprintk("RPC: %s cred=%p\n", __func__, gss_cred);
1016 gss_free_cred_callback(struct rcu_head *head)
1018 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1019 gss_free_cred(gss_cred);
1023 gss_destroy_nullcred(struct rpc_cred *cred)
1025 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1026 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1027 struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
1029 RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1030 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1033 kref_put(&gss_auth->kref, gss_free_callback);
1037 gss_destroy_cred(struct rpc_cred *cred)
1040 if (gss_destroying_context(cred))
1042 gss_destroy_nullcred(cred);
1046 * Lookup RPCSEC_GSS cred for the current process
1048 static struct rpc_cred *
1049 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1051 return rpcauth_lookup_credcache(auth, acred, flags);
1054 static struct rpc_cred *
1055 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1057 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1058 struct gss_cred *cred = NULL;
1061 dprintk("RPC: %s for uid %d, flavor %d\n",
1062 __func__, acred->uid, auth->au_flavor);
1064 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
1067 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1069 * Note: in order to force a call to call_refresh(), we deliberately
1070 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
1072 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1073 cred->gc_service = gss_auth->service;
1074 cred->gc_principal = NULL;
1075 if (acred->machine_cred)
1076 cred->gc_principal = acred->principal;
1077 kref_get(&gss_auth->kref);
1078 return &cred->gc_base;
1081 dprintk("RPC: %s failed with error %d\n", __func__, err);
1082 return ERR_PTR(err);
1086 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1088 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1089 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1093 err = gss_create_upcall(gss_auth, gss_cred);
1094 } while (err == -EAGAIN);
1099 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1101 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1103 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1105 /* Don't match with creds that have expired. */
1106 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
1108 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1111 if (acred->principal != NULL) {
1112 if (gss_cred->gc_principal == NULL)
1114 return strcmp(acred->principal, gss_cred->gc_principal) == 0;
1116 if (gss_cred->gc_principal != NULL)
1118 return rc->cr_uid == acred->uid;
1122 * Marshal credentials.
1123 * Maybe we should keep a cached credential for performance reasons.
1126 gss_marshal(struct rpc_task *task, __be32 *p)
1128 struct rpc_rqst *req = task->tk_rqstp;
1129 struct rpc_cred *cred = req->rq_cred;
1130 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1132 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1135 struct xdr_netobj mic;
1137 struct xdr_buf verf_buf;
1139 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1141 *p++ = htonl(RPC_AUTH_GSS);
1144 spin_lock(&ctx->gc_seq_lock);
1145 req->rq_seqno = ctx->gc_seq++;
1146 spin_unlock(&ctx->gc_seq_lock);
1148 *p++ = htonl((u32) RPC_GSS_VERSION);
1149 *p++ = htonl((u32) ctx->gc_proc);
1150 *p++ = htonl((u32) req->rq_seqno);
1151 *p++ = htonl((u32) gss_cred->gc_service);
1152 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1153 *cred_len = htonl((p - (cred_len + 1)) << 2);
1155 /* We compute the checksum for the verifier over the xdr-encoded bytes
1156 * starting with the xid and ending at the end of the credential: */
1157 iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
1158 req->rq_snd_buf.head[0].iov_base);
1159 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1160 xdr_buf_from_iov(&iov, &verf_buf);
1162 /* set verifier flavor*/
1163 *p++ = htonl(RPC_AUTH_GSS);
1165 mic.data = (u8 *)(p + 1);
1166 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1167 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1168 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1169 } else if (maj_stat != 0) {
1170 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1173 p = xdr_encode_opaque(p, NULL, mic.len);
1181 static int gss_renew_cred(struct rpc_task *task)
1183 struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1184 struct gss_cred *gss_cred = container_of(oldcred,
1187 struct rpc_auth *auth = oldcred->cr_auth;
1188 struct auth_cred acred = {
1189 .uid = oldcred->cr_uid,
1190 .principal = gss_cred->gc_principal,
1191 .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1193 struct rpc_cred *new;
1195 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1197 return PTR_ERR(new);
1198 task->tk_rqstp->rq_cred = new;
1199 put_rpccred(oldcred);
1203 static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1205 if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1206 unsigned long now = jiffies;
1207 unsigned long begin, expire;
1208 struct gss_cred *gss_cred;
1210 gss_cred = container_of(cred, struct gss_cred, gc_base);
1211 begin = gss_cred->gc_upcall_timestamp;
1212 expire = begin + gss_expired_cred_retry_delay * HZ;
1214 if (time_in_range_open(now, begin, expire))
1221 * Refresh credentials. XXX - finish
1224 gss_refresh(struct rpc_task *task)
1226 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1229 if (gss_cred_is_negative_entry(cred))
1230 return -EKEYEXPIRED;
1232 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1233 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1234 ret = gss_renew_cred(task);
1237 cred = task->tk_rqstp->rq_cred;
1240 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1241 ret = gss_refresh_upcall(task);
1246 /* Dummy refresh routine: used only when destroying the context */
1248 gss_refresh_null(struct rpc_task *task)
1254 gss_validate(struct rpc_task *task, __be32 *p)
1256 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1257 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1260 struct xdr_buf verf_buf;
1261 struct xdr_netobj mic;
1265 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1268 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1270 if (flav != RPC_AUTH_GSS)
1272 seq = htonl(task->tk_rqstp->rq_seqno);
1273 iov.iov_base = &seq;
1274 iov.iov_len = sizeof(seq);
1275 xdr_buf_from_iov(&iov, &verf_buf);
1279 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1280 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1281 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1283 dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1284 task->tk_pid, __func__, maj_stat);
1287 /* We leave it to unwrap to calculate au_rslack. For now we just
1288 * calculate the length of the verifier: */
1289 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1291 dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1292 task->tk_pid, __func__);
1293 return p + XDR_QUADLEN(len);
1296 dprintk("RPC: %5u %s failed.\n", task->tk_pid, __func__);
1300 static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
1301 __be32 *p, void *obj)
1303 struct xdr_stream xdr;
1305 xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
1306 encode(rqstp, &xdr, obj);
1310 gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1311 kxdreproc_t encode, struct rpc_rqst *rqstp,
1312 __be32 *p, void *obj)
1314 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1315 struct xdr_buf integ_buf;
1316 __be32 *integ_len = NULL;
1317 struct xdr_netobj mic;
1325 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1326 *p++ = htonl(rqstp->rq_seqno);
1328 gss_wrap_req_encode(encode, rqstp, p, obj);
1330 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1331 offset, snd_buf->len - offset))
1333 *integ_len = htonl(integ_buf.len);
1335 /* guess whether we're in the head or the tail: */
1336 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1337 iov = snd_buf->tail;
1339 iov = snd_buf->head;
1340 p = iov->iov_base + iov->iov_len;
1341 mic.data = (u8 *)(p + 1);
1343 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1344 status = -EIO; /* XXX? */
1345 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1346 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1349 q = xdr_encode_opaque(p, NULL, mic.len);
1351 offset = (u8 *)q - (u8 *)p;
1352 iov->iov_len += offset;
1353 snd_buf->len += offset;
1358 priv_release_snd_buf(struct rpc_rqst *rqstp)
1362 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1363 __free_page(rqstp->rq_enc_pages[i]);
1364 kfree(rqstp->rq_enc_pages);
1368 alloc_enc_pages(struct rpc_rqst *rqstp)
1370 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1373 if (snd_buf->page_len == 0) {
1374 rqstp->rq_enc_pages_num = 0;
1378 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1379 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1380 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1382 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1384 if (!rqstp->rq_enc_pages)
1386 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1387 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1388 if (rqstp->rq_enc_pages[i] == NULL)
1391 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1394 rqstp->rq_enc_pages_num = i;
1395 priv_release_snd_buf(rqstp);
1401 gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1402 kxdreproc_t encode, struct rpc_rqst *rqstp,
1403 __be32 *p, void *obj)
1405 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1410 struct page **inpages;
1417 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1418 *p++ = htonl(rqstp->rq_seqno);
1420 gss_wrap_req_encode(encode, rqstp, p, obj);
1422 status = alloc_enc_pages(rqstp);
1425 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1426 inpages = snd_buf->pages + first;
1427 snd_buf->pages = rqstp->rq_enc_pages;
1428 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1430 * Give the tail its own page, in case we need extra space in the
1431 * head when wrapping:
1433 * call_allocate() allocates twice the slack space required
1434 * by the authentication flavor to rq_callsize.
1435 * For GSS, slack is GSS_CRED_SLACK.
1437 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1438 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1439 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1440 snd_buf->tail[0].iov_base = tmp;
1442 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1443 /* slack space should prevent this ever happening: */
1444 BUG_ON(snd_buf->len > snd_buf->buflen);
1446 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1447 * done anyway, so it's safe to put the request on the wire: */
1448 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1449 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1453 *opaque_len = htonl(snd_buf->len - offset);
1454 /* guess whether we're in the head or the tail: */
1455 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1456 iov = snd_buf->tail;
1458 iov = snd_buf->head;
1459 p = iov->iov_base + iov->iov_len;
1460 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1462 iov->iov_len += pad;
1463 snd_buf->len += pad;
1469 gss_wrap_req(struct rpc_task *task,
1470 kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
1472 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1473 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1475 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1478 dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1479 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1480 /* The spec seems a little ambiguous here, but I think that not
1481 * wrapping context destruction requests makes the most sense.
1483 gss_wrap_req_encode(encode, rqstp, p, obj);
1487 switch (gss_cred->gc_service) {
1488 case RPC_GSS_SVC_NONE:
1489 gss_wrap_req_encode(encode, rqstp, p, obj);
1492 case RPC_GSS_SVC_INTEGRITY:
1493 status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
1495 case RPC_GSS_SVC_PRIVACY:
1496 status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
1501 dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
1506 gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1507 struct rpc_rqst *rqstp, __be32 **p)
1509 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1510 struct xdr_buf integ_buf;
1511 struct xdr_netobj mic;
1512 u32 data_offset, mic_offset;
1517 integ_len = ntohl(*(*p)++);
1520 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1521 mic_offset = integ_len + data_offset;
1522 if (mic_offset > rcv_buf->len)
1524 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1527 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1528 mic_offset - data_offset))
1531 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1534 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1535 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1536 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1537 if (maj_stat != GSS_S_COMPLETE)
1543 gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1544 struct rpc_rqst *rqstp, __be32 **p)
1546 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1552 opaque_len = ntohl(*(*p)++);
1553 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1554 if (offset + opaque_len > rcv_buf->len)
1556 /* remove padding: */
1557 rcv_buf->len = offset + opaque_len;
1559 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1560 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1561 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1562 if (maj_stat != GSS_S_COMPLETE)
1564 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1571 gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
1572 __be32 *p, void *obj)
1574 struct xdr_stream xdr;
1576 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
1577 return decode(rqstp, &xdr, obj);
1581 gss_unwrap_resp(struct rpc_task *task,
1582 kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
1584 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1585 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1587 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1589 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1590 int savedlen = head->iov_len;
1593 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1595 switch (gss_cred->gc_service) {
1596 case RPC_GSS_SVC_NONE:
1598 case RPC_GSS_SVC_INTEGRITY:
1599 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1603 case RPC_GSS_SVC_PRIVACY:
1604 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1609 /* take into account extra slack for integrity and privacy cases: */
1610 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1611 + (savedlen - head->iov_len);
1613 status = gss_unwrap_req_decode(decode, rqstp, p, obj);
1616 dprintk("RPC: %5u %s returning %d\n",
1617 task->tk_pid, __func__, status);
1621 static const struct rpc_authops authgss_ops = {
1622 .owner = THIS_MODULE,
1623 .au_flavor = RPC_AUTH_GSS,
1624 .au_name = "RPCSEC_GSS",
1625 .create = gss_create,
1626 .destroy = gss_destroy,
1627 .lookup_cred = gss_lookup_cred,
1628 .crcreate = gss_create_cred,
1629 .pipes_create = gss_pipes_dentries_create,
1630 .pipes_destroy = gss_pipes_dentries_destroy,
1631 .list_pseudoflavors = gss_mech_list_pseudoflavors,
1634 static const struct rpc_credops gss_credops = {
1635 .cr_name = "AUTH_GSS",
1636 .crdestroy = gss_destroy_cred,
1637 .cr_init = gss_cred_init,
1638 .crbind = rpcauth_generic_bind_cred,
1639 .crmatch = gss_match,
1640 .crmarshal = gss_marshal,
1641 .crrefresh = gss_refresh,
1642 .crvalidate = gss_validate,
1643 .crwrap_req = gss_wrap_req,
1644 .crunwrap_resp = gss_unwrap_resp,
1647 static const struct rpc_credops gss_nullops = {
1648 .cr_name = "AUTH_GSS",
1649 .crdestroy = gss_destroy_nullcred,
1650 .crbind = rpcauth_generic_bind_cred,
1651 .crmatch = gss_match,
1652 .crmarshal = gss_marshal,
1653 .crrefresh = gss_refresh_null,
1654 .crvalidate = gss_validate,
1655 .crwrap_req = gss_wrap_req,
1656 .crunwrap_resp = gss_unwrap_resp,
1659 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
1660 .upcall = rpc_pipe_generic_upcall,
1661 .downcall = gss_pipe_downcall,
1662 .destroy_msg = gss_pipe_destroy_msg,
1663 .open_pipe = gss_pipe_open_v0,
1664 .release_pipe = gss_pipe_release,
1667 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
1668 .upcall = rpc_pipe_generic_upcall,
1669 .downcall = gss_pipe_downcall,
1670 .destroy_msg = gss_pipe_destroy_msg,
1671 .open_pipe = gss_pipe_open_v1,
1672 .release_pipe = gss_pipe_release,
1675 static __net_init int rpcsec_gss_init_net(struct net *net)
1677 return gss_svc_init_net(net);
1680 static __net_exit void rpcsec_gss_exit_net(struct net *net)
1682 gss_svc_shutdown_net(net);
1685 static struct pernet_operations rpcsec_gss_net_ops = {
1686 .init = rpcsec_gss_init_net,
1687 .exit = rpcsec_gss_exit_net,
1691 * Initialize RPCSEC_GSS module
1693 static int __init init_rpcsec_gss(void)
1697 err = rpcauth_register(&authgss_ops);
1700 err = gss_svc_init();
1702 goto out_unregister;
1703 err = register_pernet_subsys(&rpcsec_gss_net_ops);
1706 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
1711 rpcauth_unregister(&authgss_ops);
1716 static void __exit exit_rpcsec_gss(void)
1718 unregister_pernet_subsys(&rpcsec_gss_net_ops);
1720 rpcauth_unregister(&authgss_ops);
1721 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1724 MODULE_LICENSE("GPL");
1725 module_param_named(expired_cred_retry_delay,
1726 gss_expired_cred_retry_delay,
1728 MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
1729 "the RPC engine retries an expired credential");
1731 module_init(init_rpcsec_gss)
1732 module_exit(exit_rpcsec_gss)