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 error %ld\n", __func__
, -PTR_ERR(p
));
254 #define UPCALL_BUF_LEN 128
256 struct gss_upcall_msg
{
259 struct rpc_pipe_msg msg
;
260 struct list_head list
;
261 struct gss_auth
*auth
;
262 struct rpc_pipe
*pipe
;
263 struct rpc_wait_queue rpc_waitqueue
;
264 wait_queue_head_t waitqueue
;
265 struct gss_cl_ctx
*ctx
;
266 char databuf
[UPCALL_BUF_LEN
];
269 static int get_pipe_version(void)
273 spin_lock(&pipe_version_lock
);
274 if (pipe_version
>= 0) {
275 atomic_inc(&pipe_users
);
279 spin_unlock(&pipe_version_lock
);
283 static void put_pipe_version(void)
285 if (atomic_dec_and_lock(&pipe_users
, &pipe_version_lock
)) {
287 spin_unlock(&pipe_version_lock
);
292 gss_release_msg(struct gss_upcall_msg
*gss_msg
)
294 if (!atomic_dec_and_test(&gss_msg
->count
))
297 BUG_ON(!list_empty(&gss_msg
->list
));
298 if (gss_msg
->ctx
!= NULL
)
299 gss_put_ctx(gss_msg
->ctx
);
300 rpc_destroy_wait_queue(&gss_msg
->rpc_waitqueue
);
304 static struct gss_upcall_msg
*
305 __gss_find_upcall(struct rpc_pipe
*pipe
, uid_t uid
)
307 struct gss_upcall_msg
*pos
;
308 list_for_each_entry(pos
, &pipe
->in_downcall
, list
) {
311 atomic_inc(&pos
->count
);
312 dprintk("RPC: %s found msg %p\n", __func__
, pos
);
315 dprintk("RPC: %s found nothing\n", __func__
);
319 /* Try to add an upcall to the pipefs queue.
320 * If an upcall owned by our uid already exists, then we return a reference
321 * to that upcall instead of adding the new upcall.
323 static inline struct gss_upcall_msg
*
324 gss_add_msg(struct gss_upcall_msg
*gss_msg
)
326 struct rpc_pipe
*pipe
= gss_msg
->pipe
;
327 struct gss_upcall_msg
*old
;
329 spin_lock(&pipe
->lock
);
330 old
= __gss_find_upcall(pipe
, gss_msg
->uid
);
332 atomic_inc(&gss_msg
->count
);
333 list_add(&gss_msg
->list
, &pipe
->in_downcall
);
336 spin_unlock(&pipe
->lock
);
341 __gss_unhash_msg(struct gss_upcall_msg
*gss_msg
)
343 list_del_init(&gss_msg
->list
);
344 rpc_wake_up_status(&gss_msg
->rpc_waitqueue
, gss_msg
->msg
.errno
);
345 wake_up_all(&gss_msg
->waitqueue
);
346 atomic_dec(&gss_msg
->count
);
350 gss_unhash_msg(struct gss_upcall_msg
*gss_msg
)
352 struct rpc_pipe
*pipe
= gss_msg
->pipe
;
354 if (list_empty(&gss_msg
->list
))
356 spin_lock(&pipe
->lock
);
357 if (!list_empty(&gss_msg
->list
))
358 __gss_unhash_msg(gss_msg
);
359 spin_unlock(&pipe
->lock
);
363 gss_handle_downcall_result(struct gss_cred
*gss_cred
, struct gss_upcall_msg
*gss_msg
)
365 switch (gss_msg
->msg
.errno
) {
367 if (gss_msg
->ctx
== NULL
)
369 clear_bit(RPCAUTH_CRED_NEGATIVE
, &gss_cred
->gc_base
.cr_flags
);
370 gss_cred_set_ctx(&gss_cred
->gc_base
, gss_msg
->ctx
);
373 set_bit(RPCAUTH_CRED_NEGATIVE
, &gss_cred
->gc_base
.cr_flags
);
375 gss_cred
->gc_upcall_timestamp
= jiffies
;
376 gss_cred
->gc_upcall
= NULL
;
377 rpc_wake_up_status(&gss_msg
->rpc_waitqueue
, gss_msg
->msg
.errno
);
381 gss_upcall_callback(struct rpc_task
*task
)
383 struct gss_cred
*gss_cred
= container_of(task
->tk_rqstp
->rq_cred
,
384 struct gss_cred
, gc_base
);
385 struct gss_upcall_msg
*gss_msg
= gss_cred
->gc_upcall
;
386 struct rpc_pipe
*pipe
= gss_msg
->pipe
;
388 spin_lock(&pipe
->lock
);
389 gss_handle_downcall_result(gss_cred
, gss_msg
);
390 spin_unlock(&pipe
->lock
);
391 task
->tk_status
= gss_msg
->msg
.errno
;
392 gss_release_msg(gss_msg
);
395 static void gss_encode_v0_msg(struct gss_upcall_msg
*gss_msg
)
397 gss_msg
->msg
.data
= &gss_msg
->uid
;
398 gss_msg
->msg
.len
= sizeof(gss_msg
->uid
);
401 static void gss_encode_v1_msg(struct gss_upcall_msg
*gss_msg
,
402 struct rpc_clnt
*clnt
,
403 const char *service_name
)
405 struct gss_api_mech
*mech
= gss_msg
->auth
->mech
;
406 char *p
= gss_msg
->databuf
;
409 gss_msg
->msg
.len
= sprintf(gss_msg
->databuf
, "mech=%s uid=%d ",
412 p
+= gss_msg
->msg
.len
;
413 if (clnt
->cl_principal
) {
414 len
= sprintf(p
, "target=%s ", clnt
->cl_principal
);
416 gss_msg
->msg
.len
+= len
;
418 if (service_name
!= NULL
) {
419 len
= sprintf(p
, "service=%s ", service_name
);
421 gss_msg
->msg
.len
+= len
;
423 if (mech
->gm_upcall_enctypes
) {
424 len
= sprintf(p
, "enctypes=%s ", mech
->gm_upcall_enctypes
);
426 gss_msg
->msg
.len
+= len
;
428 len
= sprintf(p
, "\n");
429 gss_msg
->msg
.len
+= len
;
431 gss_msg
->msg
.data
= gss_msg
->databuf
;
432 BUG_ON(gss_msg
->msg
.len
> UPCALL_BUF_LEN
);
435 static void gss_encode_msg(struct gss_upcall_msg
*gss_msg
,
436 struct rpc_clnt
*clnt
,
437 const char *service_name
)
439 if (pipe_version
== 0)
440 gss_encode_v0_msg(gss_msg
);
441 else /* pipe_version == 1 */
442 gss_encode_v1_msg(gss_msg
, clnt
, service_name
);
445 static struct gss_upcall_msg
*
446 gss_alloc_msg(struct gss_auth
*gss_auth
, struct rpc_clnt
*clnt
,
447 uid_t uid
, const char *service_name
)
449 struct gss_upcall_msg
*gss_msg
;
452 gss_msg
= kzalloc(sizeof(*gss_msg
), GFP_NOFS
);
454 return ERR_PTR(-ENOMEM
);
455 vers
= get_pipe_version();
458 return ERR_PTR(vers
);
460 gss_msg
->pipe
= gss_auth
->pipe
[vers
];
461 INIT_LIST_HEAD(&gss_msg
->list
);
462 rpc_init_wait_queue(&gss_msg
->rpc_waitqueue
, "RPCSEC_GSS upcall waitq");
463 init_waitqueue_head(&gss_msg
->waitqueue
);
464 atomic_set(&gss_msg
->count
, 1);
466 gss_msg
->auth
= gss_auth
;
467 gss_encode_msg(gss_msg
, clnt
, service_name
);
471 static struct gss_upcall_msg
*
472 gss_setup_upcall(struct rpc_clnt
*clnt
, struct gss_auth
*gss_auth
, struct rpc_cred
*cred
)
474 struct gss_cred
*gss_cred
= container_of(cred
,
475 struct gss_cred
, gc_base
);
476 struct gss_upcall_msg
*gss_new
, *gss_msg
;
477 uid_t uid
= cred
->cr_uid
;
479 gss_new
= gss_alloc_msg(gss_auth
, clnt
, uid
, gss_cred
->gc_principal
);
482 gss_msg
= gss_add_msg(gss_new
);
483 if (gss_msg
== gss_new
) {
484 int res
= rpc_queue_upcall(gss_new
->pipe
, &gss_new
->msg
);
486 gss_unhash_msg(gss_new
);
487 gss_msg
= ERR_PTR(res
);
490 gss_release_msg(gss_new
);
494 static void warn_gssd(void)
496 static unsigned long ratelimit
;
497 unsigned long now
= jiffies
;
499 if (time_after(now
, ratelimit
)) {
500 printk(KERN_WARNING
"RPC: AUTH_GSS upcall timed out.\n"
501 "Please check user daemon is running.\n");
502 ratelimit
= now
+ 15*HZ
;
507 gss_refresh_upcall(struct rpc_task
*task
)
509 struct rpc_cred
*cred
= task
->tk_rqstp
->rq_cred
;
510 struct gss_auth
*gss_auth
= container_of(cred
->cr_auth
,
511 struct gss_auth
, rpc_auth
);
512 struct gss_cred
*gss_cred
= container_of(cred
,
513 struct gss_cred
, gc_base
);
514 struct gss_upcall_msg
*gss_msg
;
515 struct rpc_pipe
*pipe
;
518 dprintk("RPC: %5u %s for uid %u\n",
519 task
->tk_pid
, __func__
, cred
->cr_uid
);
520 gss_msg
= gss_setup_upcall(task
->tk_client
, gss_auth
, cred
);
521 if (PTR_ERR(gss_msg
) == -EAGAIN
) {
522 /* XXX: warning on the first, under the assumption we
523 * shouldn't normally hit this case on a refresh. */
525 task
->tk_timeout
= 15*HZ
;
526 rpc_sleep_on(&pipe_version_rpc_waitqueue
, task
, NULL
);
529 if (IS_ERR(gss_msg
)) {
530 err
= PTR_ERR(gss_msg
);
533 pipe
= gss_msg
->pipe
;
534 spin_lock(&pipe
->lock
);
535 if (gss_cred
->gc_upcall
!= NULL
)
536 rpc_sleep_on(&gss_cred
->gc_upcall
->rpc_waitqueue
, task
, NULL
);
537 else if (gss_msg
->ctx
== NULL
&& gss_msg
->msg
.errno
>= 0) {
538 task
->tk_timeout
= 0;
539 gss_cred
->gc_upcall
= gss_msg
;
540 /* gss_upcall_callback will release the reference to gss_upcall_msg */
541 atomic_inc(&gss_msg
->count
);
542 rpc_sleep_on(&gss_msg
->rpc_waitqueue
, task
, gss_upcall_callback
);
544 gss_handle_downcall_result(gss_cred
, gss_msg
);
545 err
= gss_msg
->msg
.errno
;
547 spin_unlock(&pipe
->lock
);
548 gss_release_msg(gss_msg
);
550 dprintk("RPC: %5u %s for uid %u result %d\n",
551 task
->tk_pid
, __func__
, cred
->cr_uid
, err
);
556 gss_create_upcall(struct gss_auth
*gss_auth
, struct gss_cred
*gss_cred
)
558 struct rpc_pipe
*pipe
;
559 struct rpc_cred
*cred
= &gss_cred
->gc_base
;
560 struct gss_upcall_msg
*gss_msg
;
564 dprintk("RPC: %s for uid %u\n", __func__
, cred
->cr_uid
);
566 gss_msg
= gss_setup_upcall(gss_auth
->client
, gss_auth
, cred
);
567 if (PTR_ERR(gss_msg
) == -EAGAIN
) {
568 err
= wait_event_interruptible_timeout(pipe_version_waitqueue
,
569 pipe_version
>= 0, 15*HZ
);
570 if (pipe_version
< 0) {
578 if (IS_ERR(gss_msg
)) {
579 err
= PTR_ERR(gss_msg
);
582 pipe
= gss_msg
->pipe
;
584 prepare_to_wait(&gss_msg
->waitqueue
, &wait
, TASK_KILLABLE
);
585 spin_lock(&pipe
->lock
);
586 if (gss_msg
->ctx
!= NULL
|| gss_msg
->msg
.errno
< 0) {
589 spin_unlock(&pipe
->lock
);
590 if (fatal_signal_pending(current
)) {
597 gss_cred_set_ctx(cred
, gss_msg
->ctx
);
599 err
= gss_msg
->msg
.errno
;
600 spin_unlock(&pipe
->lock
);
602 finish_wait(&gss_msg
->waitqueue
, &wait
);
603 gss_release_msg(gss_msg
);
605 dprintk("RPC: %s for uid %u result %d\n",
606 __func__
, cred
->cr_uid
, err
);
610 #define MSG_BUF_MAXSIZE 1024
613 gss_pipe_downcall(struct file
*filp
, const char __user
*src
, size_t mlen
)
617 struct gss_upcall_msg
*gss_msg
;
618 struct rpc_pipe
*pipe
= RPC_I(filp
->f_dentry
->d_inode
)->pipe
;
619 struct gss_cl_ctx
*ctx
;
621 ssize_t err
= -EFBIG
;
623 if (mlen
> MSG_BUF_MAXSIZE
)
626 buf
= kmalloc(mlen
, GFP_NOFS
);
631 if (copy_from_user(buf
, src
, mlen
))
634 end
= (const void *)((char *)buf
+ mlen
);
635 p
= simple_get_bytes(buf
, end
, &uid
, sizeof(uid
));
642 ctx
= gss_alloc_context();
647 /* Find a matching upcall */
648 spin_lock(&pipe
->lock
);
649 gss_msg
= __gss_find_upcall(pipe
, uid
);
650 if (gss_msg
== NULL
) {
651 spin_unlock(&pipe
->lock
);
654 list_del_init(&gss_msg
->list
);
655 spin_unlock(&pipe
->lock
);
657 p
= gss_fill_context(p
, end
, ctx
, gss_msg
->auth
->mech
);
663 gss_msg
->msg
.errno
= err
;
670 gss_msg
->msg
.errno
= -EAGAIN
;
673 printk(KERN_CRIT
"%s: bad return from "
674 "gss_fill_context: %zd\n", __func__
, err
);
677 goto err_release_msg
;
679 gss_msg
->ctx
= gss_get_ctx(ctx
);
683 spin_lock(&pipe
->lock
);
684 __gss_unhash_msg(gss_msg
);
685 spin_unlock(&pipe
->lock
);
686 gss_release_msg(gss_msg
);
692 dprintk("RPC: %s returning %Zd\n", __func__
, err
);
696 static int gss_pipe_open(struct inode
*inode
, int new_version
)
700 spin_lock(&pipe_version_lock
);
701 if (pipe_version
< 0) {
702 /* First open of any gss pipe determines the version: */
703 pipe_version
= new_version
;
704 rpc_wake_up(&pipe_version_rpc_waitqueue
);
705 wake_up(&pipe_version_waitqueue
);
706 } else if (pipe_version
!= new_version
) {
707 /* Trying to open a pipe of a different version */
711 atomic_inc(&pipe_users
);
713 spin_unlock(&pipe_version_lock
);
718 static int gss_pipe_open_v0(struct inode
*inode
)
720 return gss_pipe_open(inode
, 0);
723 static int gss_pipe_open_v1(struct inode
*inode
)
725 return gss_pipe_open(inode
, 1);
729 gss_pipe_release(struct inode
*inode
)
731 struct rpc_pipe
*pipe
= RPC_I(inode
)->pipe
;
732 struct gss_upcall_msg
*gss_msg
;
735 spin_lock(&pipe
->lock
);
736 list_for_each_entry(gss_msg
, &pipe
->in_downcall
, list
) {
738 if (!list_empty(&gss_msg
->msg
.list
))
740 gss_msg
->msg
.errno
= -EPIPE
;
741 atomic_inc(&gss_msg
->count
);
742 __gss_unhash_msg(gss_msg
);
743 spin_unlock(&pipe
->lock
);
744 gss_release_msg(gss_msg
);
747 spin_unlock(&pipe
->lock
);
753 gss_pipe_destroy_msg(struct rpc_pipe_msg
*msg
)
755 struct gss_upcall_msg
*gss_msg
= container_of(msg
, struct gss_upcall_msg
, msg
);
757 if (msg
->errno
< 0) {
758 dprintk("RPC: %s releasing msg %p\n",
760 atomic_inc(&gss_msg
->count
);
761 gss_unhash_msg(gss_msg
);
762 if (msg
->errno
== -ETIMEDOUT
)
764 gss_release_msg(gss_msg
);
768 static void gss_pipes_dentries_destroy(struct rpc_auth
*auth
)
770 struct gss_auth
*gss_auth
;
772 gss_auth
= container_of(auth
, struct gss_auth
, rpc_auth
);
773 if (gss_auth
->pipe
[0]->dentry
)
774 rpc_unlink(gss_auth
->pipe
[0]->dentry
);
775 if (gss_auth
->pipe
[1]->dentry
)
776 rpc_unlink(gss_auth
->pipe
[1]->dentry
);
779 static int gss_pipes_dentries_create(struct rpc_auth
*auth
)
782 struct gss_auth
*gss_auth
;
783 struct rpc_clnt
*clnt
;
785 gss_auth
= container_of(auth
, struct gss_auth
, rpc_auth
);
786 clnt
= gss_auth
->client
;
788 gss_auth
->pipe
[1]->dentry
= rpc_mkpipe_dentry(clnt
->cl_dentry
,
790 clnt
, gss_auth
->pipe
[1]);
791 if (IS_ERR(gss_auth
->pipe
[1]->dentry
))
792 return PTR_ERR(gss_auth
->pipe
[1]->dentry
);
793 gss_auth
->pipe
[0]->dentry
= rpc_mkpipe_dentry(clnt
->cl_dentry
,
794 gss_auth
->mech
->gm_name
,
795 clnt
, gss_auth
->pipe
[0]);
796 if (IS_ERR(gss_auth
->pipe
[0]->dentry
)) {
797 err
= PTR_ERR(gss_auth
->pipe
[0]->dentry
);
798 goto err_unlink_pipe_1
;
803 rpc_unlink(gss_auth
->pipe
[1]->dentry
);
807 static void gss_pipes_dentries_destroy_net(struct rpc_clnt
*clnt
,
808 struct rpc_auth
*auth
)
810 struct net
*net
= rpc_net_ns(clnt
);
811 struct super_block
*sb
;
813 sb
= rpc_get_sb_net(net
);
816 gss_pipes_dentries_destroy(auth
);
821 static int gss_pipes_dentries_create_net(struct rpc_clnt
*clnt
,
822 struct rpc_auth
*auth
)
824 struct net
*net
= rpc_net_ns(clnt
);
825 struct super_block
*sb
;
828 sb
= rpc_get_sb_net(net
);
831 err
= gss_pipes_dentries_create(auth
);
838 * NOTE: we have the opportunity to use different
839 * parameters based on the input flavor (which must be a pseudoflavor)
841 static struct rpc_auth
*
842 gss_create(struct rpc_clnt
*clnt
, rpc_authflavor_t flavor
)
844 struct gss_auth
*gss_auth
;
845 struct rpc_auth
* auth
;
846 int err
= -ENOMEM
; /* XXX? */
848 dprintk("RPC: creating GSS authenticator for client %p\n", clnt
);
850 if (!try_module_get(THIS_MODULE
))
852 if (!(gss_auth
= kmalloc(sizeof(*gss_auth
), GFP_KERNEL
)))
854 gss_auth
->client
= clnt
;
856 gss_auth
->mech
= gss_mech_get_by_pseudoflavor(flavor
);
857 if (!gss_auth
->mech
) {
858 printk(KERN_WARNING
"%s: Pseudoflavor %d not found!\n",
862 gss_auth
->service
= gss_pseudoflavor_to_service(gss_auth
->mech
, flavor
);
863 if (gss_auth
->service
== 0)
865 auth
= &gss_auth
->rpc_auth
;
866 auth
->au_cslack
= GSS_CRED_SLACK
>> 2;
867 auth
->au_rslack
= GSS_VERF_SLACK
>> 2;
868 auth
->au_ops
= &authgss_ops
;
869 auth
->au_flavor
= flavor
;
870 atomic_set(&auth
->au_count
, 1);
871 kref_init(&gss_auth
->kref
);
874 * Note: if we created the old pipe first, then someone who
875 * examined the directory at the right moment might conclude
876 * that we supported only the old pipe. So we instead create
877 * the new pipe first.
879 gss_auth
->pipe
[1] = rpc_mkpipe_data(&gss_upcall_ops_v1
,
880 RPC_PIPE_WAIT_FOR_OPEN
);
881 if (IS_ERR(gss_auth
->pipe
[1])) {
882 err
= PTR_ERR(gss_auth
->pipe
[1]);
886 gss_auth
->pipe
[0] = rpc_mkpipe_data(&gss_upcall_ops_v0
,
887 RPC_PIPE_WAIT_FOR_OPEN
);
888 if (IS_ERR(gss_auth
->pipe
[0])) {
889 err
= PTR_ERR(gss_auth
->pipe
[0]);
890 goto err_destroy_pipe_1
;
892 err
= gss_pipes_dentries_create_net(clnt
, auth
);
894 goto err_destroy_pipe_0
;
895 err
= rpcauth_init_credcache(auth
);
897 goto err_unlink_pipes
;
901 gss_pipes_dentries_destroy_net(clnt
, auth
);
903 rpc_destroy_pipe_data(gss_auth
->pipe
[0]);
905 rpc_destroy_pipe_data(gss_auth
->pipe
[1]);
907 gss_mech_put(gss_auth
->mech
);
911 module_put(THIS_MODULE
);
916 gss_free(struct gss_auth
*gss_auth
)
918 gss_pipes_dentries_destroy_net(gss_auth
->client
, &gss_auth
->rpc_auth
);
919 rpc_destroy_pipe_data(gss_auth
->pipe
[0]);
920 rpc_destroy_pipe_data(gss_auth
->pipe
[1]);
921 gss_mech_put(gss_auth
->mech
);
924 module_put(THIS_MODULE
);
928 gss_free_callback(struct kref
*kref
)
930 struct gss_auth
*gss_auth
= container_of(kref
, struct gss_auth
, kref
);
936 gss_destroy(struct rpc_auth
*auth
)
938 struct gss_auth
*gss_auth
;
940 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
941 auth
, auth
->au_flavor
);
943 rpcauth_destroy_credcache(auth
);
945 gss_auth
= container_of(auth
, struct gss_auth
, rpc_auth
);
946 kref_put(&gss_auth
->kref
, gss_free_callback
);
950 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
951 * to the server with the GSS control procedure field set to
952 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
953 * all RPCSEC_GSS state associated with that context.
956 gss_destroying_context(struct rpc_cred
*cred
)
958 struct gss_cred
*gss_cred
= container_of(cred
, struct gss_cred
, gc_base
);
959 struct gss_auth
*gss_auth
= container_of(cred
->cr_auth
, struct gss_auth
, rpc_auth
);
960 struct rpc_task
*task
;
962 if (gss_cred
->gc_ctx
== NULL
||
963 test_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
) == 0)
966 gss_cred
->gc_ctx
->gc_proc
= RPC_GSS_PROC_DESTROY
;
967 cred
->cr_ops
= &gss_nullops
;
969 /* Take a reference to ensure the cred will be destroyed either
970 * by the RPC call or by the put_rpccred() below */
973 task
= rpc_call_null(gss_auth
->client
, cred
, RPC_TASK_ASYNC
|RPC_TASK_SOFT
);
981 /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
982 * to create a new cred or context, so they check that things have been
983 * allocated before freeing them. */
985 gss_do_free_ctx(struct gss_cl_ctx
*ctx
)
987 dprintk("RPC: %s\n", __func__
);
989 gss_delete_sec_context(&ctx
->gc_gss_ctx
);
990 kfree(ctx
->gc_wire_ctx
.data
);
995 gss_free_ctx_callback(struct rcu_head
*head
)
997 struct gss_cl_ctx
*ctx
= container_of(head
, struct gss_cl_ctx
, gc_rcu
);
998 gss_do_free_ctx(ctx
);
1002 gss_free_ctx(struct gss_cl_ctx
*ctx
)
1004 call_rcu(&ctx
->gc_rcu
, gss_free_ctx_callback
);
1008 gss_free_cred(struct gss_cred
*gss_cred
)
1010 dprintk("RPC: %s cred=%p\n", __func__
, gss_cred
);
1015 gss_free_cred_callback(struct rcu_head
*head
)
1017 struct gss_cred
*gss_cred
= container_of(head
, struct gss_cred
, gc_base
.cr_rcu
);
1018 gss_free_cred(gss_cred
);
1022 gss_destroy_nullcred(struct rpc_cred
*cred
)
1024 struct gss_cred
*gss_cred
= container_of(cred
, struct gss_cred
, gc_base
);
1025 struct gss_auth
*gss_auth
= container_of(cred
->cr_auth
, struct gss_auth
, rpc_auth
);
1026 struct gss_cl_ctx
*ctx
= gss_cred
->gc_ctx
;
1028 RCU_INIT_POINTER(gss_cred
->gc_ctx
, NULL
);
1029 call_rcu(&cred
->cr_rcu
, gss_free_cred_callback
);
1032 kref_put(&gss_auth
->kref
, gss_free_callback
);
1036 gss_destroy_cred(struct rpc_cred
*cred
)
1039 if (gss_destroying_context(cred
))
1041 gss_destroy_nullcred(cred
);
1045 * Lookup RPCSEC_GSS cred for the current process
1047 static struct rpc_cred
*
1048 gss_lookup_cred(struct rpc_auth
*auth
, struct auth_cred
*acred
, int flags
)
1050 return rpcauth_lookup_credcache(auth
, acred
, flags
);
1053 static struct rpc_cred
*
1054 gss_create_cred(struct rpc_auth
*auth
, struct auth_cred
*acred
, int flags
)
1056 struct gss_auth
*gss_auth
= container_of(auth
, struct gss_auth
, rpc_auth
);
1057 struct gss_cred
*cred
= NULL
;
1060 dprintk("RPC: %s for uid %d, flavor %d\n",
1061 __func__
, acred
->uid
, auth
->au_flavor
);
1063 if (!(cred
= kzalloc(sizeof(*cred
), GFP_NOFS
)))
1066 rpcauth_init_cred(&cred
->gc_base
, acred
, auth
, &gss_credops
);
1068 * Note: in order to force a call to call_refresh(), we deliberately
1069 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
1071 cred
->gc_base
.cr_flags
= 1UL << RPCAUTH_CRED_NEW
;
1072 cred
->gc_service
= gss_auth
->service
;
1073 cred
->gc_principal
= NULL
;
1074 if (acred
->machine_cred
)
1075 cred
->gc_principal
= acred
->principal
;
1076 kref_get(&gss_auth
->kref
);
1077 return &cred
->gc_base
;
1080 dprintk("RPC: %s failed with error %d\n", __func__
, err
);
1081 return ERR_PTR(err
);
1085 gss_cred_init(struct rpc_auth
*auth
, struct rpc_cred
*cred
)
1087 struct gss_auth
*gss_auth
= container_of(auth
, struct gss_auth
, rpc_auth
);
1088 struct gss_cred
*gss_cred
= container_of(cred
,struct gss_cred
, gc_base
);
1092 err
= gss_create_upcall(gss_auth
, gss_cred
);
1093 } while (err
== -EAGAIN
);
1098 gss_match(struct auth_cred
*acred
, struct rpc_cred
*rc
, int flags
)
1100 struct gss_cred
*gss_cred
= container_of(rc
, struct gss_cred
, gc_base
);
1102 if (test_bit(RPCAUTH_CRED_NEW
, &rc
->cr_flags
))
1104 /* Don't match with creds that have expired. */
1105 if (time_after(jiffies
, gss_cred
->gc_ctx
->gc_expiry
))
1107 if (!test_bit(RPCAUTH_CRED_UPTODATE
, &rc
->cr_flags
))
1110 if (acred
->principal
!= NULL
) {
1111 if (gss_cred
->gc_principal
== NULL
)
1113 return strcmp(acred
->principal
, gss_cred
->gc_principal
) == 0;
1115 if (gss_cred
->gc_principal
!= NULL
)
1117 return rc
->cr_uid
== acred
->uid
;
1121 * Marshal credentials.
1122 * Maybe we should keep a cached credential for performance reasons.
1125 gss_marshal(struct rpc_task
*task
, __be32
*p
)
1127 struct rpc_rqst
*req
= task
->tk_rqstp
;
1128 struct rpc_cred
*cred
= req
->rq_cred
;
1129 struct gss_cred
*gss_cred
= container_of(cred
, struct gss_cred
,
1131 struct gss_cl_ctx
*ctx
= gss_cred_get_ctx(cred
);
1134 struct xdr_netobj mic
;
1136 struct xdr_buf verf_buf
;
1138 dprintk("RPC: %5u %s\n", task
->tk_pid
, __func__
);
1140 *p
++ = htonl(RPC_AUTH_GSS
);
1143 spin_lock(&ctx
->gc_seq_lock
);
1144 req
->rq_seqno
= ctx
->gc_seq
++;
1145 spin_unlock(&ctx
->gc_seq_lock
);
1147 *p
++ = htonl((u32
) RPC_GSS_VERSION
);
1148 *p
++ = htonl((u32
) ctx
->gc_proc
);
1149 *p
++ = htonl((u32
) req
->rq_seqno
);
1150 *p
++ = htonl((u32
) gss_cred
->gc_service
);
1151 p
= xdr_encode_netobj(p
, &ctx
->gc_wire_ctx
);
1152 *cred_len
= htonl((p
- (cred_len
+ 1)) << 2);
1154 /* We compute the checksum for the verifier over the xdr-encoded bytes
1155 * starting with the xid and ending at the end of the credential: */
1156 iov
.iov_base
= xprt_skip_transport_header(req
->rq_xprt
,
1157 req
->rq_snd_buf
.head
[0].iov_base
);
1158 iov
.iov_len
= (u8
*)p
- (u8
*)iov
.iov_base
;
1159 xdr_buf_from_iov(&iov
, &verf_buf
);
1161 /* set verifier flavor*/
1162 *p
++ = htonl(RPC_AUTH_GSS
);
1164 mic
.data
= (u8
*)(p
+ 1);
1165 maj_stat
= gss_get_mic(ctx
->gc_gss_ctx
, &verf_buf
, &mic
);
1166 if (maj_stat
== GSS_S_CONTEXT_EXPIRED
) {
1167 clear_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
);
1168 } else if (maj_stat
!= 0) {
1169 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat
);
1172 p
= xdr_encode_opaque(p
, NULL
, mic
.len
);
1180 static int gss_renew_cred(struct rpc_task
*task
)
1182 struct rpc_cred
*oldcred
= task
->tk_rqstp
->rq_cred
;
1183 struct gss_cred
*gss_cred
= container_of(oldcred
,
1186 struct rpc_auth
*auth
= oldcred
->cr_auth
;
1187 struct auth_cred acred
= {
1188 .uid
= oldcred
->cr_uid
,
1189 .principal
= gss_cred
->gc_principal
,
1190 .machine_cred
= (gss_cred
->gc_principal
!= NULL
? 1 : 0),
1192 struct rpc_cred
*new;
1194 new = gss_lookup_cred(auth
, &acred
, RPCAUTH_LOOKUP_NEW
);
1196 return PTR_ERR(new);
1197 task
->tk_rqstp
->rq_cred
= new;
1198 put_rpccred(oldcred
);
1202 static int gss_cred_is_negative_entry(struct rpc_cred
*cred
)
1204 if (test_bit(RPCAUTH_CRED_NEGATIVE
, &cred
->cr_flags
)) {
1205 unsigned long now
= jiffies
;
1206 unsigned long begin
, expire
;
1207 struct gss_cred
*gss_cred
;
1209 gss_cred
= container_of(cred
, struct gss_cred
, gc_base
);
1210 begin
= gss_cred
->gc_upcall_timestamp
;
1211 expire
= begin
+ gss_expired_cred_retry_delay
* HZ
;
1213 if (time_in_range_open(now
, begin
, expire
))
1220 * Refresh credentials. XXX - finish
1223 gss_refresh(struct rpc_task
*task
)
1225 struct rpc_cred
*cred
= task
->tk_rqstp
->rq_cred
;
1228 if (gss_cred_is_negative_entry(cred
))
1229 return -EKEYEXPIRED
;
1231 if (!test_bit(RPCAUTH_CRED_NEW
, &cred
->cr_flags
) &&
1232 !test_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
)) {
1233 ret
= gss_renew_cred(task
);
1236 cred
= task
->tk_rqstp
->rq_cred
;
1239 if (test_bit(RPCAUTH_CRED_NEW
, &cred
->cr_flags
))
1240 ret
= gss_refresh_upcall(task
);
1245 /* Dummy refresh routine: used only when destroying the context */
1247 gss_refresh_null(struct rpc_task
*task
)
1253 gss_validate(struct rpc_task
*task
, __be32
*p
)
1255 struct rpc_cred
*cred
= task
->tk_rqstp
->rq_cred
;
1256 struct gss_cl_ctx
*ctx
= gss_cred_get_ctx(cred
);
1259 struct xdr_buf verf_buf
;
1260 struct xdr_netobj mic
;
1264 dprintk("RPC: %5u %s\n", task
->tk_pid
, __func__
);
1267 if ((len
= ntohl(*p
++)) > RPC_MAX_AUTH_SIZE
)
1269 if (flav
!= RPC_AUTH_GSS
)
1271 seq
= htonl(task
->tk_rqstp
->rq_seqno
);
1272 iov
.iov_base
= &seq
;
1273 iov
.iov_len
= sizeof(seq
);
1274 xdr_buf_from_iov(&iov
, &verf_buf
);
1278 maj_stat
= gss_verify_mic(ctx
->gc_gss_ctx
, &verf_buf
, &mic
);
1279 if (maj_stat
== GSS_S_CONTEXT_EXPIRED
)
1280 clear_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
);
1282 dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1283 task
->tk_pid
, __func__
, maj_stat
);
1286 /* We leave it to unwrap to calculate au_rslack. For now we just
1287 * calculate the length of the verifier: */
1288 cred
->cr_auth
->au_verfsize
= XDR_QUADLEN(len
) + 2;
1290 dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1291 task
->tk_pid
, __func__
);
1292 return p
+ XDR_QUADLEN(len
);
1295 dprintk("RPC: %5u %s failed.\n", task
->tk_pid
, __func__
);
1299 static void gss_wrap_req_encode(kxdreproc_t encode
, struct rpc_rqst
*rqstp
,
1300 __be32
*p
, void *obj
)
1302 struct xdr_stream xdr
;
1304 xdr_init_encode(&xdr
, &rqstp
->rq_snd_buf
, p
);
1305 encode(rqstp
, &xdr
, obj
);
1309 gss_wrap_req_integ(struct rpc_cred
*cred
, struct gss_cl_ctx
*ctx
,
1310 kxdreproc_t encode
, struct rpc_rqst
*rqstp
,
1311 __be32
*p
, void *obj
)
1313 struct xdr_buf
*snd_buf
= &rqstp
->rq_snd_buf
;
1314 struct xdr_buf integ_buf
;
1315 __be32
*integ_len
= NULL
;
1316 struct xdr_netobj mic
;
1324 offset
= (u8
*)p
- (u8
*)snd_buf
->head
[0].iov_base
;
1325 *p
++ = htonl(rqstp
->rq_seqno
);
1327 gss_wrap_req_encode(encode
, rqstp
, p
, obj
);
1329 if (xdr_buf_subsegment(snd_buf
, &integ_buf
,
1330 offset
, snd_buf
->len
- offset
))
1332 *integ_len
= htonl(integ_buf
.len
);
1334 /* guess whether we're in the head or the tail: */
1335 if (snd_buf
->page_len
|| snd_buf
->tail
[0].iov_len
)
1336 iov
= snd_buf
->tail
;
1338 iov
= snd_buf
->head
;
1339 p
= iov
->iov_base
+ iov
->iov_len
;
1340 mic
.data
= (u8
*)(p
+ 1);
1342 maj_stat
= gss_get_mic(ctx
->gc_gss_ctx
, &integ_buf
, &mic
);
1343 status
= -EIO
; /* XXX? */
1344 if (maj_stat
== GSS_S_CONTEXT_EXPIRED
)
1345 clear_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
);
1348 q
= xdr_encode_opaque(p
, NULL
, mic
.len
);
1350 offset
= (u8
*)q
- (u8
*)p
;
1351 iov
->iov_len
+= offset
;
1352 snd_buf
->len
+= offset
;
1357 priv_release_snd_buf(struct rpc_rqst
*rqstp
)
1361 for (i
=0; i
< rqstp
->rq_enc_pages_num
; i
++)
1362 __free_page(rqstp
->rq_enc_pages
[i
]);
1363 kfree(rqstp
->rq_enc_pages
);
1367 alloc_enc_pages(struct rpc_rqst
*rqstp
)
1369 struct xdr_buf
*snd_buf
= &rqstp
->rq_snd_buf
;
1372 if (snd_buf
->page_len
== 0) {
1373 rqstp
->rq_enc_pages_num
= 0;
1377 first
= snd_buf
->page_base
>> PAGE_CACHE_SHIFT
;
1378 last
= (snd_buf
->page_base
+ snd_buf
->page_len
- 1) >> PAGE_CACHE_SHIFT
;
1379 rqstp
->rq_enc_pages_num
= last
- first
+ 1 + 1;
1381 = kmalloc(rqstp
->rq_enc_pages_num
* sizeof(struct page
*),
1383 if (!rqstp
->rq_enc_pages
)
1385 for (i
=0; i
< rqstp
->rq_enc_pages_num
; i
++) {
1386 rqstp
->rq_enc_pages
[i
] = alloc_page(GFP_NOFS
);
1387 if (rqstp
->rq_enc_pages
[i
] == NULL
)
1390 rqstp
->rq_release_snd_buf
= priv_release_snd_buf
;
1393 rqstp
->rq_enc_pages_num
= i
;
1394 priv_release_snd_buf(rqstp
);
1400 gss_wrap_req_priv(struct rpc_cred
*cred
, struct gss_cl_ctx
*ctx
,
1401 kxdreproc_t encode
, struct rpc_rqst
*rqstp
,
1402 __be32
*p
, void *obj
)
1404 struct xdr_buf
*snd_buf
= &rqstp
->rq_snd_buf
;
1409 struct page
**inpages
;
1416 offset
= (u8
*)p
- (u8
*)snd_buf
->head
[0].iov_base
;
1417 *p
++ = htonl(rqstp
->rq_seqno
);
1419 gss_wrap_req_encode(encode
, rqstp
, p
, obj
);
1421 status
= alloc_enc_pages(rqstp
);
1424 first
= snd_buf
->page_base
>> PAGE_CACHE_SHIFT
;
1425 inpages
= snd_buf
->pages
+ first
;
1426 snd_buf
->pages
= rqstp
->rq_enc_pages
;
1427 snd_buf
->page_base
-= first
<< PAGE_CACHE_SHIFT
;
1429 * Give the tail its own page, in case we need extra space in the
1430 * head when wrapping:
1432 * call_allocate() allocates twice the slack space required
1433 * by the authentication flavor to rq_callsize.
1434 * For GSS, slack is GSS_CRED_SLACK.
1436 if (snd_buf
->page_len
|| snd_buf
->tail
[0].iov_len
) {
1437 tmp
= page_address(rqstp
->rq_enc_pages
[rqstp
->rq_enc_pages_num
- 1]);
1438 memcpy(tmp
, snd_buf
->tail
[0].iov_base
, snd_buf
->tail
[0].iov_len
);
1439 snd_buf
->tail
[0].iov_base
= tmp
;
1441 maj_stat
= gss_wrap(ctx
->gc_gss_ctx
, offset
, snd_buf
, inpages
);
1442 /* slack space should prevent this ever happening: */
1443 BUG_ON(snd_buf
->len
> snd_buf
->buflen
);
1445 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1446 * done anyway, so it's safe to put the request on the wire: */
1447 if (maj_stat
== GSS_S_CONTEXT_EXPIRED
)
1448 clear_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
);
1452 *opaque_len
= htonl(snd_buf
->len
- offset
);
1453 /* guess whether we're in the head or the tail: */
1454 if (snd_buf
->page_len
|| snd_buf
->tail
[0].iov_len
)
1455 iov
= snd_buf
->tail
;
1457 iov
= snd_buf
->head
;
1458 p
= iov
->iov_base
+ iov
->iov_len
;
1459 pad
= 3 - ((snd_buf
->len
- offset
- 1) & 3);
1461 iov
->iov_len
+= pad
;
1462 snd_buf
->len
+= pad
;
1468 gss_wrap_req(struct rpc_task
*task
,
1469 kxdreproc_t encode
, void *rqstp
, __be32
*p
, void *obj
)
1471 struct rpc_cred
*cred
= task
->tk_rqstp
->rq_cred
;
1472 struct gss_cred
*gss_cred
= container_of(cred
, struct gss_cred
,
1474 struct gss_cl_ctx
*ctx
= gss_cred_get_ctx(cred
);
1477 dprintk("RPC: %5u %s\n", task
->tk_pid
, __func__
);
1478 if (ctx
->gc_proc
!= RPC_GSS_PROC_DATA
) {
1479 /* The spec seems a little ambiguous here, but I think that not
1480 * wrapping context destruction requests makes the most sense.
1482 gss_wrap_req_encode(encode
, rqstp
, p
, obj
);
1486 switch (gss_cred
->gc_service
) {
1487 case RPC_GSS_SVC_NONE
:
1488 gss_wrap_req_encode(encode
, rqstp
, p
, obj
);
1491 case RPC_GSS_SVC_INTEGRITY
:
1492 status
= gss_wrap_req_integ(cred
, ctx
, encode
, rqstp
, p
, obj
);
1494 case RPC_GSS_SVC_PRIVACY
:
1495 status
= gss_wrap_req_priv(cred
, ctx
, encode
, rqstp
, p
, obj
);
1500 dprintk("RPC: %5u %s returning %d\n", task
->tk_pid
, __func__
, status
);
1505 gss_unwrap_resp_integ(struct rpc_cred
*cred
, struct gss_cl_ctx
*ctx
,
1506 struct rpc_rqst
*rqstp
, __be32
**p
)
1508 struct xdr_buf
*rcv_buf
= &rqstp
->rq_rcv_buf
;
1509 struct xdr_buf integ_buf
;
1510 struct xdr_netobj mic
;
1511 u32 data_offset
, mic_offset
;
1516 integ_len
= ntohl(*(*p
)++);
1519 data_offset
= (u8
*)(*p
) - (u8
*)rcv_buf
->head
[0].iov_base
;
1520 mic_offset
= integ_len
+ data_offset
;
1521 if (mic_offset
> rcv_buf
->len
)
1523 if (ntohl(*(*p
)++) != rqstp
->rq_seqno
)
1526 if (xdr_buf_subsegment(rcv_buf
, &integ_buf
, data_offset
,
1527 mic_offset
- data_offset
))
1530 if (xdr_buf_read_netobj(rcv_buf
, &mic
, mic_offset
))
1533 maj_stat
= gss_verify_mic(ctx
->gc_gss_ctx
, &integ_buf
, &mic
);
1534 if (maj_stat
== GSS_S_CONTEXT_EXPIRED
)
1535 clear_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
);
1536 if (maj_stat
!= GSS_S_COMPLETE
)
1542 gss_unwrap_resp_priv(struct rpc_cred
*cred
, struct gss_cl_ctx
*ctx
,
1543 struct rpc_rqst
*rqstp
, __be32
**p
)
1545 struct xdr_buf
*rcv_buf
= &rqstp
->rq_rcv_buf
;
1551 opaque_len
= ntohl(*(*p
)++);
1552 offset
= (u8
*)(*p
) - (u8
*)rcv_buf
->head
[0].iov_base
;
1553 if (offset
+ opaque_len
> rcv_buf
->len
)
1555 /* remove padding: */
1556 rcv_buf
->len
= offset
+ opaque_len
;
1558 maj_stat
= gss_unwrap(ctx
->gc_gss_ctx
, offset
, rcv_buf
);
1559 if (maj_stat
== GSS_S_CONTEXT_EXPIRED
)
1560 clear_bit(RPCAUTH_CRED_UPTODATE
, &cred
->cr_flags
);
1561 if (maj_stat
!= GSS_S_COMPLETE
)
1563 if (ntohl(*(*p
)++) != rqstp
->rq_seqno
)
1570 gss_unwrap_req_decode(kxdrdproc_t decode
, struct rpc_rqst
*rqstp
,
1571 __be32
*p
, void *obj
)
1573 struct xdr_stream xdr
;
1575 xdr_init_decode(&xdr
, &rqstp
->rq_rcv_buf
, p
);
1576 return decode(rqstp
, &xdr
, obj
);
1580 gss_unwrap_resp(struct rpc_task
*task
,
1581 kxdrdproc_t decode
, void *rqstp
, __be32
*p
, void *obj
)
1583 struct rpc_cred
*cred
= task
->tk_rqstp
->rq_cred
;
1584 struct gss_cred
*gss_cred
= container_of(cred
, struct gss_cred
,
1586 struct gss_cl_ctx
*ctx
= gss_cred_get_ctx(cred
);
1588 struct kvec
*head
= ((struct rpc_rqst
*)rqstp
)->rq_rcv_buf
.head
;
1589 int savedlen
= head
->iov_len
;
1592 if (ctx
->gc_proc
!= RPC_GSS_PROC_DATA
)
1594 switch (gss_cred
->gc_service
) {
1595 case RPC_GSS_SVC_NONE
:
1597 case RPC_GSS_SVC_INTEGRITY
:
1598 status
= gss_unwrap_resp_integ(cred
, ctx
, rqstp
, &p
);
1602 case RPC_GSS_SVC_PRIVACY
:
1603 status
= gss_unwrap_resp_priv(cred
, ctx
, rqstp
, &p
);
1608 /* take into account extra slack for integrity and privacy cases: */
1609 cred
->cr_auth
->au_rslack
= cred
->cr_auth
->au_verfsize
+ (p
- savedp
)
1610 + (savedlen
- head
->iov_len
);
1612 status
= gss_unwrap_req_decode(decode
, rqstp
, p
, obj
);
1615 dprintk("RPC: %5u %s returning %d\n",
1616 task
->tk_pid
, __func__
, status
);
1620 static const struct rpc_authops authgss_ops
= {
1621 .owner
= THIS_MODULE
,
1622 .au_flavor
= RPC_AUTH_GSS
,
1623 .au_name
= "RPCSEC_GSS",
1624 .create
= gss_create
,
1625 .destroy
= gss_destroy
,
1626 .lookup_cred
= gss_lookup_cred
,
1627 .crcreate
= gss_create_cred
,
1628 .pipes_create
= gss_pipes_dentries_create
,
1629 .pipes_destroy
= gss_pipes_dentries_destroy
,
1630 .list_pseudoflavors
= gss_mech_list_pseudoflavors
,
1633 static const struct rpc_credops gss_credops
= {
1634 .cr_name
= "AUTH_GSS",
1635 .crdestroy
= gss_destroy_cred
,
1636 .cr_init
= gss_cred_init
,
1637 .crbind
= rpcauth_generic_bind_cred
,
1638 .crmatch
= gss_match
,
1639 .crmarshal
= gss_marshal
,
1640 .crrefresh
= gss_refresh
,
1641 .crvalidate
= gss_validate
,
1642 .crwrap_req
= gss_wrap_req
,
1643 .crunwrap_resp
= gss_unwrap_resp
,
1646 static const struct rpc_credops gss_nullops
= {
1647 .cr_name
= "AUTH_GSS",
1648 .crdestroy
= gss_destroy_nullcred
,
1649 .crbind
= rpcauth_generic_bind_cred
,
1650 .crmatch
= gss_match
,
1651 .crmarshal
= gss_marshal
,
1652 .crrefresh
= gss_refresh_null
,
1653 .crvalidate
= gss_validate
,
1654 .crwrap_req
= gss_wrap_req
,
1655 .crunwrap_resp
= gss_unwrap_resp
,
1658 static const struct rpc_pipe_ops gss_upcall_ops_v0
= {
1659 .upcall
= rpc_pipe_generic_upcall
,
1660 .downcall
= gss_pipe_downcall
,
1661 .destroy_msg
= gss_pipe_destroy_msg
,
1662 .open_pipe
= gss_pipe_open_v0
,
1663 .release_pipe
= gss_pipe_release
,
1666 static const struct rpc_pipe_ops gss_upcall_ops_v1
= {
1667 .upcall
= rpc_pipe_generic_upcall
,
1668 .downcall
= gss_pipe_downcall
,
1669 .destroy_msg
= gss_pipe_destroy_msg
,
1670 .open_pipe
= gss_pipe_open_v1
,
1671 .release_pipe
= gss_pipe_release
,
1674 static __net_init
int rpcsec_gss_init_net(struct net
*net
)
1676 return gss_svc_init_net(net
);
1679 static __net_exit
void rpcsec_gss_exit_net(struct net
*net
)
1681 gss_svc_shutdown_net(net
);
1684 static struct pernet_operations rpcsec_gss_net_ops
= {
1685 .init
= rpcsec_gss_init_net
,
1686 .exit
= rpcsec_gss_exit_net
,
1690 * Initialize RPCSEC_GSS module
1692 static int __init
init_rpcsec_gss(void)
1696 err
= rpcauth_register(&authgss_ops
);
1699 err
= gss_svc_init();
1701 goto out_unregister
;
1702 err
= register_pernet_subsys(&rpcsec_gss_net_ops
);
1705 rpc_init_wait_queue(&pipe_version_rpc_waitqueue
, "gss pipe version");
1710 rpcauth_unregister(&authgss_ops
);
1715 static void __exit
exit_rpcsec_gss(void)
1717 unregister_pernet_subsys(&rpcsec_gss_net_ops
);
1719 rpcauth_unregister(&authgss_ops
);
1720 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1723 MODULE_LICENSE("GPL");
1724 module_param_named(expired_cred_retry_delay
,
1725 gss_expired_cred_retry_delay
,
1727 MODULE_PARM_DESC(expired_cred_retry_delay
, "Timeout (in seconds) until "
1728 "the RPC engine retries an expired credential");
1730 module_init(init_rpcsec_gss
)
1731 module_exit(exit_rpcsec_gss
)