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[linux-2.6-block.git] / net / sunrpc / auth_gss / auth_gss.c
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1da177e4 1/*
f30c2269 2 * linux/net/sunrpc/auth_gss/auth_gss.c
1da177e4
LT		 3 *
4 * RPCSEC_GSS client authentication.
5 *
6 * Copyright (c) 2000 The Regents of the University of Michigan.
7 * All rights reserved.
8 *
9 * Dug Song <dugsong@monkey.org>
10 * Andy Adamson <andros@umich.edu>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
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.
24 *
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.
36 *
37 * $Id$
38 */
39
40
41#include <linux/module.h>
42#include <linux/init.h>
43#include <linux/types.h>
44#include <linux/slab.h>
1da177e4 45#include <linux/sched.h>
2d2da60c 46#include <linux/pagemap.h>
1da177e4
LT		 47#include <linux/sunrpc/clnt.h>
48#include <linux/sunrpc/auth.h>
49#include <linux/sunrpc/auth_gss.h>
50#include <linux/sunrpc/svcauth_gss.h>
51#include <linux/sunrpc/gss_err.h>
52#include <linux/workqueue.h>
53#include <linux/sunrpc/rpc_pipe_fs.h>
54#include <linux/sunrpc/gss_api.h>
55#include <asm/uaccess.h>
56
57static struct rpc_authops authgss_ops;
58
59static struct rpc_credops gss_credops;
60
61#ifdef RPC_DEBUG
62# define RPCDBG_FACILITY RPCDBG_AUTH
63#endif
64
65#define NFS_NGROUPS 16
66
67#define GSS_CRED_EXPIRE (60 * HZ) /* XXX: reasonable? */
68#define GSS_CRED_SLACK 1024 /* XXX: unused */
69/* length of a krb5 verifier (48), plus data added before arguments when
70 * using integrity (two 4-byte integers): */
adeb8133 71#define GSS_VERF_SLACK 100
1da177e4
LT		 72
73/* XXX this define must match the gssd define
74* as it is passed to gssd to signal the use of
75* machine creds should be part of the shared rpc interface */
76
77#define CA_RUN_AS_MACHINE 0x00000200
78
79/* dump the buffer in `emacs-hexl' style */
80#define isprint(c) ((c > 0x1f) && (c < 0x7f))
81
82static DEFINE_RWLOCK(gss_ctx_lock);
83
84struct gss_auth {
85 struct rpc_auth rpc_auth;
86 struct gss_api_mech *mech;
87 enum rpc_gss_svc service;
88 struct list_head upcalls;
89 struct rpc_clnt *client;
90 struct dentry *dentry;
1da177e4
LT		 91 spinlock_t lock;
92};
93
94static void gss_destroy_ctx(struct gss_cl_ctx *);
95static struct rpc_pipe_ops gss_upcall_ops;
96
1da177e4
LT		 97static inline struct gss_cl_ctx *
98gss_get_ctx(struct gss_cl_ctx *ctx)
99{
100 atomic_inc(&ctx->count);
101 return ctx;
102}
103
104static inline void
105gss_put_ctx(struct gss_cl_ctx *ctx)
106{
107 if (atomic_dec_and_test(&ctx->count))
108 gss_destroy_ctx(ctx);
109}
110
111static void
112gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
113{
114 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
115 struct gss_cl_ctx *old;
116 write_lock(&gss_ctx_lock);
117 old = gss_cred->gc_ctx;
118 gss_cred->gc_ctx = ctx;
119 cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
8a317760 120 cred->cr_flags &= ~RPCAUTH_CRED_NEW;
1da177e4
LT		 121 write_unlock(&gss_ctx_lock);
122 if (old)
123 gss_put_ctx(old);
124}
125
126static int
127gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
128{
129 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
130 int res = 0;
131
132 read_lock(&gss_ctx_lock);
133 if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx)
134 res = 1;
135 read_unlock(&gss_ctx_lock);
136 return res;
137}
138
139static const void *
140simple_get_bytes(const void *p, const void *end, void *res, size_t len)
141{
142 const void *q = (const void *)((const char *)p + len);
143 if (unlikely(q > end || q < p))
144 return ERR_PTR(-EFAULT);
145 memcpy(res, p, len);
146 return q;
147}
148
149static inline const void *
150simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
151{
152 const void *q;
153 unsigned int len;
154
155 p = simple_get_bytes(p, end, &len, sizeof(len));
156 if (IS_ERR(p))
157 return p;
158 q = (const void *)((const char *)p + len);
159 if (unlikely(q > end || q < p))
160 return ERR_PTR(-EFAULT);
e69062b4 161 dest->data = kmemdup(p, len, GFP_KERNEL);
1da177e4
LT		 162 if (unlikely(dest->data == NULL))
163 return ERR_PTR(-ENOMEM);
164 dest->len = len;
1da177e4
LT		 165 return q;
166}
167
168static struct gss_cl_ctx *
169gss_cred_get_ctx(struct rpc_cred *cred)
170{
171 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
172 struct gss_cl_ctx *ctx = NULL;
173
174 read_lock(&gss_ctx_lock);
175 if (gss_cred->gc_ctx)
176 ctx = gss_get_ctx(gss_cred->gc_ctx);
177 read_unlock(&gss_ctx_lock);
178 return ctx;
179}
180
181static struct gss_cl_ctx *
182gss_alloc_context(void)
183{
184 struct gss_cl_ctx *ctx;
185
0da974f4 186 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1da177e4 187 if (ctx != NULL) {
1da177e4
LT		 188 ctx->gc_proc = RPC_GSS_PROC_DATA;
189 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
190 spin_lock_init(&ctx->gc_seq_lock);
191 atomic_set(&ctx->count,1);
192 }
193 return ctx;
194}
195
196#define GSSD_MIN_TIMEOUT (60 * 60)
197static const void *
198gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
199{
200 const void *q;
201 unsigned int seclen;
202 unsigned int timeout;
203 u32 window_size;
204 int ret;
205
206 /* First unsigned int gives the lifetime (in seconds) of the cred */
207 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
208 if (IS_ERR(p))
209 goto err;
210 if (timeout == 0)
211 timeout = GSSD_MIN_TIMEOUT;
212 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
213 /* Sequence number window. Determines the maximum number of simultaneous requests */
214 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
215 if (IS_ERR(p))
216 goto err;
217 ctx->gc_win = window_size;
218 /* gssd signals an error by passing ctx->gc_win = 0: */
219 if (ctx->gc_win == 0) {
220 /* in which case, p points to an error code which we ignore */
221 p = ERR_PTR(-EACCES);
222 goto err;
223 }
224 /* copy the opaque wire context */
225 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
226 if (IS_ERR(p))
227 goto err;
228 /* import the opaque security context */
229 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
230 if (IS_ERR(p))
231 goto err;
232 q = (const void *)((const char *)p + seclen);
233 if (unlikely(q > end || q < p)) {
234 p = ERR_PTR(-EFAULT);
235 goto err;
236 }
237 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
238 if (ret < 0) {
239 p = ERR_PTR(ret);
240 goto err;
241 }
242 return q;
243err:
244 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p));
245 return p;
246}
247
248
249struct gss_upcall_msg {
250 atomic_t count;
251 uid_t uid;
252 struct rpc_pipe_msg msg;
253 struct list_head list;
254 struct gss_auth *auth;
255 struct rpc_wait_queue rpc_waitqueue;
256 wait_queue_head_t waitqueue;
257 struct gss_cl_ctx *ctx;
258};
259
260static void
261gss_release_msg(struct gss_upcall_msg *gss_msg)
262{
263 if (!atomic_dec_and_test(&gss_msg->count))
264 return;
265 BUG_ON(!list_empty(&gss_msg->list));
266 if (gss_msg->ctx != NULL)
267 gss_put_ctx(gss_msg->ctx);
268 kfree(gss_msg);
269}
270
271static struct gss_upcall_msg *
272__gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
273{
274 struct gss_upcall_msg *pos;
275 list_for_each_entry(pos, &gss_auth->upcalls, list) {
276 if (pos->uid != uid)
277 continue;
278 atomic_inc(&pos->count);
279 dprintk("RPC: gss_find_upcall found msg %p\n", pos);
280 return pos;
281 }
282 dprintk("RPC: gss_find_upcall found nothing\n");
283 return NULL;
284}
285
286/* Try to add a upcall to the pipefs queue.
287 * If an upcall owned by our uid already exists, then we return a reference
288 * to that upcall instead of adding the new upcall.
289 */
290static inline struct gss_upcall_msg *
291gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
292{
293 struct gss_upcall_msg *old;
294
295 spin_lock(&gss_auth->lock);
296 old = __gss_find_upcall(gss_auth, gss_msg->uid);
297 if (old == NULL) {
298 atomic_inc(&gss_msg->count);
299 list_add(&gss_msg->list, &gss_auth->upcalls);
300 } else
301 gss_msg = old;
302 spin_unlock(&gss_auth->lock);
303 return gss_msg;
304}
305
306static void
307__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
308{
309 if (list_empty(&gss_msg->list))
310 return;
311 list_del_init(&gss_msg->list);
312 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
313 wake_up_all(&gss_msg->waitqueue);
314 atomic_dec(&gss_msg->count);
315}
316
317static void
318gss_unhash_msg(struct gss_upcall_msg *gss_msg)
319{
320 struct gss_auth *gss_auth = gss_msg->auth;
321
322 spin_lock(&gss_auth->lock);
323 __gss_unhash_msg(gss_msg);
324 spin_unlock(&gss_auth->lock);
325}
326
327static void
328gss_upcall_callback(struct rpc_task *task)
329{
330 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
331 struct gss_cred, gc_base);
332 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
333
334 BUG_ON(gss_msg == NULL);
335 if (gss_msg->ctx)
336 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
337 else
338 task->tk_status = gss_msg->msg.errno;
339 spin_lock(&gss_msg->auth->lock);
340 gss_cred->gc_upcall = NULL;
341 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
342 spin_unlock(&gss_msg->auth->lock);
343 gss_release_msg(gss_msg);
344}
345
346static inline struct gss_upcall_msg *
347gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
348{
349 struct gss_upcall_msg *gss_msg;
350
0da974f4 351 gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL);
1da177e4 352 if (gss_msg != NULL) {
1da177e4
LT		 353 INIT_LIST_HEAD(&gss_msg->list);
354 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
355 init_waitqueue_head(&gss_msg->waitqueue);
356 atomic_set(&gss_msg->count, 1);
357 gss_msg->msg.data = &gss_msg->uid;
358 gss_msg->msg.len = sizeof(gss_msg->uid);
359 gss_msg->uid = uid;
360 gss_msg->auth = gss_auth;
361 }
362 return gss_msg;
363}
364
365static struct gss_upcall_msg *
366gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
367{
368 struct gss_upcall_msg *gss_new, *gss_msg;
369
370 gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
371 if (gss_new == NULL)
372 return ERR_PTR(-ENOMEM);
373 gss_msg = gss_add_msg(gss_auth, gss_new);
374 if (gss_msg == gss_new) {
375 int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg);
376 if (res) {
377 gss_unhash_msg(gss_new);
378 gss_msg = ERR_PTR(res);
379 }
380 } else
381 gss_release_msg(gss_new);
382 return gss_msg;
383}
384
385static inline int
386gss_refresh_upcall(struct rpc_task *task)
387{
388 struct rpc_cred *cred = task->tk_msg.rpc_cred;
389 struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth,
390 struct gss_auth, rpc_auth);
391 struct gss_cred *gss_cred = container_of(cred,
392 struct gss_cred, gc_base);
393 struct gss_upcall_msg *gss_msg;
394 int err = 0;
395
396 dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid);
397 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
398 if (IS_ERR(gss_msg)) {
399 err = PTR_ERR(gss_msg);
400 goto out;
401 }
402 spin_lock(&gss_auth->lock);
403 if (gss_cred->gc_upcall != NULL)
404 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
405 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
406 task->tk_timeout = 0;
407 gss_cred->gc_upcall = gss_msg;
408 /* gss_upcall_callback will release the reference to gss_upcall_msg */
409 atomic_inc(&gss_msg->count);
410 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
411 } else
412 err = gss_msg->msg.errno;
413 spin_unlock(&gss_auth->lock);
414 gss_release_msg(gss_msg);
415out:
416 dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid,
417 cred->cr_uid, err);
418 return err;
419}
420
421static inline int
422gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
423{
424 struct rpc_cred *cred = &gss_cred->gc_base;
425 struct gss_upcall_msg *gss_msg;
426 DEFINE_WAIT(wait);
427 int err = 0;
428
429 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
430 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
431 if (IS_ERR(gss_msg)) {
432 err = PTR_ERR(gss_msg);
433 goto out;
434 }
435 for (;;) {
436 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
437 spin_lock(&gss_auth->lock);
438 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
439 spin_unlock(&gss_auth->lock);
440 break;
441 }
442 spin_unlock(&gss_auth->lock);
443 if (signalled()) {
444 err = -ERESTARTSYS;
445 goto out_intr;
446 }
447 schedule();
448 }
449 if (gss_msg->ctx)
450 gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
451 else
452 err = gss_msg->msg.errno;
453out_intr:
454 finish_wait(&gss_msg->waitqueue, &wait);
455 gss_release_msg(gss_msg);
456out:
457 dprintk("RPC: gss_create_upcall for uid %u result %d\n", cred->cr_uid, err);
458 return err;
459}
460
461static ssize_t
462gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
463 char __user *dst, size_t buflen)
464{
465 char *data = (char *)msg->data + msg->copied;
466 ssize_t mlen = msg->len;
467 ssize_t left;
468
469 if (mlen > buflen)
470 mlen = buflen;
471 left = copy_to_user(dst, data, mlen);
472 if (left < 0) {
473 msg->errno = left;
474 return left;
475 }
476 mlen -= left;
477 msg->copied += mlen;
478 msg->errno = 0;
479 return mlen;
480}
481
482#define MSG_BUF_MAXSIZE 1024
483
484static ssize_t
485gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
486{
487 const void *p, *end;
488 void *buf;
489 struct rpc_clnt *clnt;
490 struct gss_auth *gss_auth;
491 struct rpc_cred *cred;
492 struct gss_upcall_msg *gss_msg;
493 struct gss_cl_ctx *ctx;
494 uid_t uid;
495 int err = -EFBIG;
496
497 if (mlen > MSG_BUF_MAXSIZE)
498 goto out;
499 err = -ENOMEM;
500 buf = kmalloc(mlen, GFP_KERNEL);
501 if (!buf)
502 goto out;
503
303b46bb 504 clnt = RPC_I(filp->f_path.dentry->d_inode)->private;
1da177e4
LT		 505 err = -EFAULT;
506 if (copy_from_user(buf, src, mlen))
507 goto err;
508
509 end = (const void *)((char *)buf + mlen);
510 p = simple_get_bytes(buf, end, &uid, sizeof(uid));
511 if (IS_ERR(p)) {
512 err = PTR_ERR(p);
513 goto err;
514 }
515
516 err = -ENOMEM;
517 ctx = gss_alloc_context();
518 if (ctx == NULL)
519 goto err;
520 err = 0;
521 gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth);
522 p = gss_fill_context(p, end, ctx, gss_auth->mech);
523 if (IS_ERR(p)) {
524 err = PTR_ERR(p);
525 if (err != -EACCES)
526 goto err_put_ctx;
527 }
528 spin_lock(&gss_auth->lock);
529 gss_msg = __gss_find_upcall(gss_auth, uid);
530 if (gss_msg) {
531 if (err == 0 && gss_msg->ctx == NULL)
532 gss_msg->ctx = gss_get_ctx(ctx);
533 gss_msg->msg.errno = err;
534 __gss_unhash_msg(gss_msg);
535 spin_unlock(&gss_auth->lock);
536 gss_release_msg(gss_msg);
537 } else {
538 struct auth_cred acred = { .uid = uid };
539 spin_unlock(&gss_auth->lock);
8a317760 540 cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, RPCAUTH_LOOKUP_NEW);
1da177e4
LT		 541 if (IS_ERR(cred)) {
542 err = PTR_ERR(cred);
543 goto err_put_ctx;
544 }
545 gss_cred_set_ctx(cred, gss_get_ctx(ctx));
546 }
547 gss_put_ctx(ctx);
548 kfree(buf);
549 dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen);
550 return mlen;
551err_put_ctx:
552 gss_put_ctx(ctx);
553err:
554 kfree(buf);
555out:
556 dprintk("RPC: gss_pipe_downcall returning %d\n", err);
557 return err;
558}
559
560static void
561gss_pipe_release(struct inode *inode)
562{
563 struct rpc_inode *rpci = RPC_I(inode);
564 struct rpc_clnt *clnt;
565 struct rpc_auth *auth;
566 struct gss_auth *gss_auth;
567
568 clnt = rpci->private;
569 auth = clnt->cl_auth;
570 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
571 spin_lock(&gss_auth->lock);
572 while (!list_empty(&gss_auth->upcalls)) {
573 struct gss_upcall_msg *gss_msg;
574
575 gss_msg = list_entry(gss_auth->upcalls.next,
576 struct gss_upcall_msg, list);
577 gss_msg->msg.errno = -EPIPE;
578 atomic_inc(&gss_msg->count);
579 __gss_unhash_msg(gss_msg);
580 spin_unlock(&gss_auth->lock);
581 gss_release_msg(gss_msg);
582 spin_lock(&gss_auth->lock);
583 }
584 spin_unlock(&gss_auth->lock);
585}
586
587static void
588gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
589{
590 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
591 static unsigned long ratelimit;
592
593 if (msg->errno < 0) {
594 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
595 gss_msg);
596 atomic_inc(&gss_msg->count);
597 gss_unhash_msg(gss_msg);
48e49187 598 if (msg->errno == -ETIMEDOUT) {
1da177e4
LT		 599 unsigned long now = jiffies;
600 if (time_after(now, ratelimit)) {
601 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
602 "Please check user daemon is running!\n");
603 ratelimit = now + 15*HZ;
604 }
605 }
606 gss_release_msg(gss_msg);
607 }
608}
609
610/*
611 * NOTE: we have the opportunity to use different
612 * parameters based on the input flavor (which must be a pseudoflavor)
613 */
614static struct rpc_auth *
615gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
616{
617 struct gss_auth *gss_auth;
618 struct rpc_auth * auth;
6a19275a 619 int err = -ENOMEM; /* XXX? */
1da177e4
LT		 620
621 dprintk("RPC: creating GSS authenticator for client %p\n",clnt);
622
623 if (!try_module_get(THIS_MODULE))
6a19275a 624 return ERR_PTR(err);
1da177e4
LT		 625 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
626 goto out_dec;
627 gss_auth->client = clnt;
6a19275a 628 err = -EINVAL;
1da177e4
LT		 629 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
630 if (!gss_auth->mech) {
631 printk(KERN_WARNING "%s: Pseudoflavor %d not found!",
632 __FUNCTION__, flavor);
633 goto err_free;
634 }
635 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
438b6fde
BF		 636 if (gss_auth->service == 0)
637 goto err_put_mech;
1da177e4
LT		 638 INIT_LIST_HEAD(&gss_auth->upcalls);
639 spin_lock_init(&gss_auth->lock);
640 auth = &gss_auth->rpc_auth;
641 auth->au_cslack = GSS_CRED_SLACK >> 2;
642 auth->au_rslack = GSS_VERF_SLACK >> 2;
643 auth->au_ops = &authgss_ops;
644 auth->au_flavor = flavor;
645 atomic_set(&auth->au_count, 1);
646
6a19275a
BF		 647 err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE);
648 if (err)
1da177e4
LT		 649 goto err_put_mech;
650
158998b6
TM		 651 gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name,
652 clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
6a19275a
BF		 653 if (IS_ERR(gss_auth->dentry)) {
654 err = PTR_ERR(gss_auth->dentry);
1da177e4 655 goto err_put_mech;
6a19275a 656 }
1da177e4
LT		 657
658 return auth;
659err_put_mech:
660 gss_mech_put(gss_auth->mech);
661err_free:
662 kfree(gss_auth);
663out_dec:
664 module_put(THIS_MODULE);
6a19275a 665 return ERR_PTR(err);
1da177e4
LT		 666}
667
668static void
669gss_destroy(struct rpc_auth *auth)
670{
671 struct gss_auth *gss_auth;
672
673 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
674 auth, auth->au_flavor);
675
676 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
5d67476f 677 rpc_unlink(gss_auth->dentry);
12de3b35 678 gss_auth->dentry = NULL;
1da177e4
LT		 679 gss_mech_put(gss_auth->mech);
680
681 rpcauth_free_credcache(auth);
682 kfree(gss_auth);
683 module_put(THIS_MODULE);
684}
685
686/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
687 * to create a new cred or context, so they check that things have been
688 * allocated before freeing them. */
689static void
690gss_destroy_ctx(struct gss_cl_ctx *ctx)
691{
692 dprintk("RPC: gss_destroy_ctx\n");
693
694 if (ctx->gc_gss_ctx)
695 gss_delete_sec_context(&ctx->gc_gss_ctx);
696
697 kfree(ctx->gc_wire_ctx.data);
698 kfree(ctx);
699}
700
701static void
702gss_destroy_cred(struct rpc_cred *rc)
703{
704 struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base);
705
706 dprintk("RPC: gss_destroy_cred \n");
707
708 if (cred->gc_ctx)
709 gss_put_ctx(cred->gc_ctx);
710 kfree(cred);
711}
712
713/*
714 * Lookup RPCSEC_GSS cred for the current process
715 */
716static struct rpc_cred *
8a317760 717gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1da177e4 718{
8a317760 719 return rpcauth_lookup_credcache(auth, acred, flags);
1da177e4
LT		 720}
721
722static struct rpc_cred *
8a317760 723gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1da177e4
LT		 724{
725 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
726 struct gss_cred *cred = NULL;
727 int err = -ENOMEM;
728
729 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
730 acred->uid, auth->au_flavor);
731
0da974f4 732 if (!(cred = kzalloc(sizeof(*cred), GFP_KERNEL)))
1da177e4
LT		 733 goto out_err;
734
1da177e4
LT		 735 atomic_set(&cred->gc_count, 1);
736 cred->gc_uid = acred->uid;
737 /*
738 * Note: in order to force a call to call_refresh(), we deliberately
739 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
740 */
741 cred->gc_flags = 0;
742 cred->gc_base.cr_ops = &gss_credops;
8a317760 743 cred->gc_base.cr_flags = RPCAUTH_CRED_NEW;
1da177e4 744 cred->gc_service = gss_auth->service;
1da177e4
LT		 745 return &cred->gc_base;
746
747out_err:
748 dprintk("RPC: gss_create_cred failed with error %d\n", err);
1da177e4
LT		 749 return ERR_PTR(err);
750}
751
fba3bad4
TM		 752static int
753gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
754{
755 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
756 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
757 int err;
758
759 do {
760 err = gss_create_upcall(gss_auth, gss_cred);
761 } while (err == -EAGAIN);
762 return err;
763}
764
1da177e4 765static int
8a317760 766gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1da177e4
LT		 767{
768 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
769
8a317760
TM		 770 /*
771 * If the searchflags have set RPCAUTH_LOOKUP_NEW, then
772 * we don't really care if the credential has expired or not,
773 * since the caller should be prepared to reinitialise it.
774 */
775 if ((flags & RPCAUTH_LOOKUP_NEW) && (rc->cr_flags & RPCAUTH_CRED_NEW))
776 goto out;
1da177e4
LT		 777 /* Don't match with creds that have expired. */
778 if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
779 return 0;
8a317760 780out:
1da177e4
LT		 781 return (rc->cr_uid == acred->uid);
782}
783
784/*
785* Marshal credentials.
786* Maybe we should keep a cached credential for performance reasons.
787*/
d8ed029d
AD		 788static __be32 *
789gss_marshal(struct rpc_task *task, __be32 *p)
1da177e4
LT		 790{
791 struct rpc_cred *cred = task->tk_msg.rpc_cred;
792 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
793 gc_base);
794 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
d8ed029d 795 __be32 *cred_len;
1da177e4
LT		 796 struct rpc_rqst *req = task->tk_rqstp;
797 u32 maj_stat = 0;
798 struct xdr_netobj mic;
799 struct kvec iov;
800 struct xdr_buf verf_buf;
801
802 dprintk("RPC: %4u gss_marshal\n", task->tk_pid);
803
804 *p++ = htonl(RPC_AUTH_GSS);
805 cred_len = p++;
806
807 spin_lock(&ctx->gc_seq_lock);
808 req->rq_seqno = ctx->gc_seq++;
809 spin_unlock(&ctx->gc_seq_lock);
810
811 *p++ = htonl((u32) RPC_GSS_VERSION);
812 *p++ = htonl((u32) ctx->gc_proc);
813 *p++ = htonl((u32) req->rq_seqno);
814 *p++ = htonl((u32) gss_cred->gc_service);
815 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
816 *cred_len = htonl((p - (cred_len + 1)) << 2);
817
818 /* We compute the checksum for the verifier over the xdr-encoded bytes
819 * starting with the xid and ending at the end of the credential: */
808012fb
CL		 820 iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
821 req->rq_snd_buf.head[0].iov_base);
1da177e4
LT		 822 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
823 xdr_buf_from_iov(&iov, &verf_buf);
824
825 /* set verifier flavor*/
826 *p++ = htonl(RPC_AUTH_GSS);
827
828 mic.data = (u8 *)(p + 1);
00fd6e14 829 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1da177e4
LT		 830 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
831 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
832 } else if (maj_stat != 0) {
833 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
834 goto out_put_ctx;
835 }
836 p = xdr_encode_opaque(p, NULL, mic.len);
837 gss_put_ctx(ctx);
838 return p;
839out_put_ctx:
840 gss_put_ctx(ctx);
841 return NULL;
842}
843
844/*
845* Refresh credentials. XXX - finish
846*/
847static int
848gss_refresh(struct rpc_task *task)
849{
850
851 if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred))
852 return gss_refresh_upcall(task);
853 return 0;
854}
855
d8ed029d
AD		 856static __be32 *
857gss_validate(struct rpc_task *task, __be32 *p)
1da177e4
LT		 858{
859 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1da177e4 860 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
d8ed029d 861 __be32 seq;
1da177e4
LT		 862 struct kvec iov;
863 struct xdr_buf verf_buf;
864 struct xdr_netobj mic;
865 u32 flav,len;
866 u32 maj_stat;
867
868 dprintk("RPC: %4u gss_validate\n", task->tk_pid);
869
870 flav = ntohl(*p++);
871 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
872 goto out_bad;
873 if (flav != RPC_AUTH_GSS)
874 goto out_bad;
875 seq = htonl(task->tk_rqstp->rq_seqno);
876 iov.iov_base = &seq;
877 iov.iov_len = sizeof(seq);
878 xdr_buf_from_iov(&iov, &verf_buf);
879 mic.data = (u8 *)p;
880 mic.len = len;
881
00fd6e14 882 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1da177e4
LT		 883 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
884 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
885 if (maj_stat)
886 goto out_bad;
24b2605b
BF		 887 /* We leave it to unwrap to calculate au_rslack. For now we just
888 * calculate the length of the verifier: */
889 task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1da177e4
LT		 890 gss_put_ctx(ctx);
891 dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
892 task->tk_pid);
893 return p + XDR_QUADLEN(len);
894out_bad:
895 gss_put_ctx(ctx);
896 dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid);
897 return NULL;
898}
899
900static inline int
901gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
d8ed029d 902 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
1da177e4
LT		 903{
904 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
905 struct xdr_buf integ_buf;
d8ed029d 906 __be32 *integ_len = NULL;
1da177e4 907 struct xdr_netobj mic;
d8ed029d
AD		 908 u32 offset;
909 __be32 *q;
1da177e4
LT		 910 struct kvec *iov;
911 u32 maj_stat = 0;
912 int status = -EIO;
913
914 integ_len = p++;
915 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
916 *p++ = htonl(rqstp->rq_seqno);
917
918 status = encode(rqstp, p, obj);
919 if (status)
920 return status;
921
922 if (xdr_buf_subsegment(snd_buf, &integ_buf,
923 offset, snd_buf->len - offset))
924 return status;
925 *integ_len = htonl(integ_buf.len);
926
927 /* guess whether we're in the head or the tail: */
928 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
929 iov = snd_buf->tail;
930 else
931 iov = snd_buf->head;
932 p = iov->iov_base + iov->iov_len;
933 mic.data = (u8 *)(p + 1);
934
00fd6e14 935 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1da177e4
LT		 936 status = -EIO; /* XXX? */
937 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
938 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
939 else if (maj_stat)
940 return status;
941 q = xdr_encode_opaque(p, NULL, mic.len);
942
943 offset = (u8 *)q - (u8 *)p;
944 iov->iov_len += offset;
945 snd_buf->len += offset;
946 return 0;
947}
948
2d2da60c
BF		 949static void
950priv_release_snd_buf(struct rpc_rqst *rqstp)
951{
952 int i;
953
954 for (i=0; i < rqstp->rq_enc_pages_num; i++)
955 __free_page(rqstp->rq_enc_pages[i]);
956 kfree(rqstp->rq_enc_pages);
957}
958
959static int
960alloc_enc_pages(struct rpc_rqst *rqstp)
961{
962 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
963 int first, last, i;
964
965 if (snd_buf->page_len == 0) {
966 rqstp->rq_enc_pages_num = 0;
967 return 0;
968 }
969
970 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
971 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
972 rqstp->rq_enc_pages_num = last - first + 1 + 1;
973 rqstp->rq_enc_pages
974 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
975 GFP_NOFS);
976 if (!rqstp->rq_enc_pages)
977 goto out;
978 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
979 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
980 if (rqstp->rq_enc_pages[i] == NULL)
981 goto out_free;
982 }
983 rqstp->rq_release_snd_buf = priv_release_snd_buf;
984 return 0;
985out_free:
986 for (i--; i >= 0; i--) {
987 __free_page(rqstp->rq_enc_pages[i]);
988 }
989out:
990 return -EAGAIN;
991}
992
993static inline int
994gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
d8ed029d 995 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
2d2da60c
BF		 996{
997 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
998 u32 offset;
999 u32 maj_stat;
1000 int status;
d8ed029d 1001 __be32 *opaque_len;
2d2da60c
BF		 1002 struct page **inpages;
1003 int first;
1004 int pad;
1005 struct kvec *iov;
1006 char *tmp;
1007
1008 opaque_len = p++;
1009 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1010 *p++ = htonl(rqstp->rq_seqno);
1011
1012 status = encode(rqstp, p, obj);
1013 if (status)
1014 return status;
1015
1016 status = alloc_enc_pages(rqstp);
1017 if (status)
1018 return status;
1019 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1020 inpages = snd_buf->pages + first;
1021 snd_buf->pages = rqstp->rq_enc_pages;
1022 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1023 /* Give the tail its own page, in case we need extra space in the
1024 * head when wrapping: */
1025 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1026 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1027 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1028 snd_buf->tail[0].iov_base = tmp;
1029 }
00fd6e14 1030 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
2d2da60c
BF		 1031 /* RPC_SLACK_SPACE should prevent this ever happening: */
1032 BUG_ON(snd_buf->len > snd_buf->buflen);
1033 status = -EIO;
1034 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1035 * done anyway, so it's safe to put the request on the wire: */
1036 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1037 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
1038 else if (maj_stat)
1039 return status;
1040
1041 *opaque_len = htonl(snd_buf->len - offset);
1042 /* guess whether we're in the head or the tail: */
1043 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1044 iov = snd_buf->tail;
1045 else
1046 iov = snd_buf->head;
1047 p = iov->iov_base + iov->iov_len;
1048 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1049 memset(p, 0, pad);
1050 iov->iov_len += pad;
1051 snd_buf->len += pad;
1052
1053 return 0;
1054}
1055
1da177e4
LT		 1056static int
1057gss_wrap_req(struct rpc_task *task,
d8ed029d 1058 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj)
1da177e4
LT		 1059{
1060 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1061 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1062 gc_base);
1063 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1064 int status = -EIO;
1065
1066 dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid);
1067 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1068 /* The spec seems a little ambiguous here, but I think that not
1069 * wrapping context destruction requests makes the most sense.
1070 */
1071 status = encode(rqstp, p, obj);
1072 goto out;
1073 }
1074 switch (gss_cred->gc_service) {
1075 case RPC_GSS_SVC_NONE:
1076 status = encode(rqstp, p, obj);
1077 break;
1078 case RPC_GSS_SVC_INTEGRITY:
1079 status = gss_wrap_req_integ(cred, ctx, encode,
1080 rqstp, p, obj);
1081 break;
1082 case RPC_GSS_SVC_PRIVACY:
2d2da60c
BF		 1083 status = gss_wrap_req_priv(cred, ctx, encode,
1084 rqstp, p, obj);
1da177e4
LT		 1085 break;
1086 }
1087out:
1088 gss_put_ctx(ctx);
1089 dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status);
1090 return status;
1091}
1092
1093static inline int
1094gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
d8ed029d 1095 struct rpc_rqst *rqstp, __be32 **p)
1da177e4
LT		 1096{
1097 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1098 struct xdr_buf integ_buf;
1099 struct xdr_netobj mic;
1100 u32 data_offset, mic_offset;
1101 u32 integ_len;
1102 u32 maj_stat;
1103 int status = -EIO;
1104
1105 integ_len = ntohl(*(*p)++);
1106 if (integ_len & 3)
1107 return status;
1108 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1109 mic_offset = integ_len + data_offset;
1110 if (mic_offset > rcv_buf->len)
1111 return status;
1112 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1113 return status;
1114
1115 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1116 mic_offset - data_offset))
1117 return status;
1118
1119 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1120 return status;
1121
00fd6e14 1122 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1da177e4
LT		 1123 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1124 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
1125 if (maj_stat != GSS_S_COMPLETE)
1126 return status;
1127 return 0;
1128}
1129
2d2da60c
BF		 1130static inline int
1131gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
d8ed029d 1132 struct rpc_rqst *rqstp, __be32 **p)
2d2da60c
BF		 1133{
1134 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1135 u32 offset;
1136 u32 opaque_len;
1137 u32 maj_stat;
1138 int status = -EIO;
1139
1140 opaque_len = ntohl(*(*p)++);
1141 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1142 if (offset + opaque_len > rcv_buf->len)
1143 return status;
1144 /* remove padding: */
1145 rcv_buf->len = offset + opaque_len;
1146
00fd6e14 1147 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
2d2da60c
BF		 1148 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1149 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
1150 if (maj_stat != GSS_S_COMPLETE)
1151 return status;
1152 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1153 return status;
1154
1155 return 0;
1156}
1157
1158
1da177e4
LT		 1159static int
1160gss_unwrap_resp(struct rpc_task *task,
d8ed029d 1161 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj)
1da177e4
LT		 1162{
1163 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1164 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1165 gc_base);
1166 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
d8ed029d 1167 __be32 *savedp = p;
2d2da60c
BF		 1168 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1169 int savedlen = head->iov_len;
1da177e4
LT		 1170 int status = -EIO;
1171
1172 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1173 goto out_decode;
1174 switch (gss_cred->gc_service) {
1175 case RPC_GSS_SVC_NONE:
1176 break;
1177 case RPC_GSS_SVC_INTEGRITY:
1178 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1179 if (status)
1180 goto out;
1181 break;
1182 case RPC_GSS_SVC_PRIVACY:
2d2da60c
BF		 1183 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1184 if (status)
1185 goto out;
1da177e4
LT		 1186 break;
1187 }
24b2605b 1188 /* take into account extra slack for integrity and privacy cases: */
2d2da60c
BF		 1189 task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp)
1190 + (savedlen - head->iov_len);
1da177e4
LT		 1191out_decode:
1192 status = decode(rqstp, p, obj);
1193out:
1194 gss_put_ctx(ctx);
1195 dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid,
1196 status);
1197 return status;
1198}
1199
1200static struct rpc_authops authgss_ops = {
1201 .owner = THIS_MODULE,
1202 .au_flavor = RPC_AUTH_GSS,
1203#ifdef RPC_DEBUG
1204 .au_name = "RPCSEC_GSS",
1205#endif
1206 .create = gss_create,
1207 .destroy = gss_destroy,
1208 .lookup_cred = gss_lookup_cred,
1209 .crcreate = gss_create_cred
1210};
1211
1212static struct rpc_credops gss_credops = {
1213 .cr_name = "AUTH_GSS",
1214 .crdestroy = gss_destroy_cred,
fba3bad4 1215 .cr_init = gss_cred_init,
1da177e4
LT		 1216 .crmatch = gss_match,
1217 .crmarshal = gss_marshal,
1218 .crrefresh = gss_refresh,
1219 .crvalidate = gss_validate,
1220 .crwrap_req = gss_wrap_req,
1221 .crunwrap_resp = gss_unwrap_resp,
1222};
1223
1224static struct rpc_pipe_ops gss_upcall_ops = {
1225 .upcall = gss_pipe_upcall,
1226 .downcall = gss_pipe_downcall,
1227 .destroy_msg = gss_pipe_destroy_msg,
1228 .release_pipe = gss_pipe_release,
1229};
1230
1231/*
1232 * Initialize RPCSEC_GSS module
1233 */
1234static int __init init_rpcsec_gss(void)
1235{
1236 int err = 0;
1237
1238 err = rpcauth_register(&authgss_ops);
1239 if (err)
1240 goto out;
1241 err = gss_svc_init();
1242 if (err)
1243 goto out_unregister;
1244 return 0;
1245out_unregister:
1246 rpcauth_unregister(&authgss_ops);
1247out:
1248 return err;
1249}
1250
1251static void __exit exit_rpcsec_gss(void)
1252{
1253 gss_svc_shutdown();
1254 rpcauth_unregister(&authgss_ops);
1255}
1256
1257MODULE_LICENSE("GPL");
1258module_init(init_rpcsec_gss)
1259module_exit(exit_rpcsec_gss)
Linux 6.x block layer and io_uring tree(s)