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[NET]: sun happymeal, little pci cleanup
[linux-2.6-block.git] / net / sunrpc / auth_gss / auth_gss.c
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1da177e4
LT		 1/*
2 * linux/net/sunrpc/auth_gss.c
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): */
71#define GSS_VERF_SLACK 56
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;
f134585a 91 char path[48];
1da177e4
LT		 92 spinlock_t lock;
93};
94
95static void gss_destroy_ctx(struct gss_cl_ctx *);
96static struct rpc_pipe_ops gss_upcall_ops;
97
98void
99print_hexl(u32 *p, u_int length, u_int offset)
100{
101 u_int i, j, jm;
102 u8 c, *cp;
103
104 dprintk("RPC: print_hexl: length %d\n",length);
105 dprintk("\n");
106 cp = (u8 *) p;
107
108 for (i = 0; i < length; i += 0x10) {
109 dprintk(" %04x: ", (u_int)(i + offset));
110 jm = length - i;
111 jm = jm > 16 ? 16 : jm;
112
113 for (j = 0; j < jm; j++) {
114 if ((j % 2) == 1)
115 dprintk("%02x ", (u_int)cp[i+j]);
116 else
117 dprintk("%02x", (u_int)cp[i+j]);
118 }
119 for (; j < 16; j++) {
120 if ((j % 2) == 1)
121 dprintk(" ");
122 else
123 dprintk(" ");
124 }
125 dprintk(" ");
126
127 for (j = 0; j < jm; j++) {
128 c = cp[i+j];
129 c = isprint(c) ? c : '.';
130 dprintk("%c", c);
131 }
132 dprintk("\n");
133 }
134}
135
136EXPORT_SYMBOL(print_hexl);
137
138static inline struct gss_cl_ctx *
139gss_get_ctx(struct gss_cl_ctx *ctx)
140{
141 atomic_inc(&ctx->count);
142 return ctx;
143}
144
145static inline void
146gss_put_ctx(struct gss_cl_ctx *ctx)
147{
148 if (atomic_dec_and_test(&ctx->count))
149 gss_destroy_ctx(ctx);
150}
151
152static void
153gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
154{
155 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
156 struct gss_cl_ctx *old;
157 write_lock(&gss_ctx_lock);
158 old = gss_cred->gc_ctx;
159 gss_cred->gc_ctx = ctx;
160 cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
8a317760 161 cred->cr_flags &= ~RPCAUTH_CRED_NEW;
1da177e4
LT		 162 write_unlock(&gss_ctx_lock);
163 if (old)
164 gss_put_ctx(old);
165}
166
167static int
168gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
169{
170 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
171 int res = 0;
172
173 read_lock(&gss_ctx_lock);
174 if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx)
175 res = 1;
176 read_unlock(&gss_ctx_lock);
177 return res;
178}
179
180static const void *
181simple_get_bytes(const void *p, const void *end, void *res, size_t len)
182{
183 const void *q = (const void *)((const char *)p + len);
184 if (unlikely(q > end || q < p))
185 return ERR_PTR(-EFAULT);
186 memcpy(res, p, len);
187 return q;
188}
189
190static inline const void *
191simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
192{
193 const void *q;
194 unsigned int len;
195
196 p = simple_get_bytes(p, end, &len, sizeof(len));
197 if (IS_ERR(p))
198 return p;
199 q = (const void *)((const char *)p + len);
200 if (unlikely(q > end || q < p))
201 return ERR_PTR(-EFAULT);
202 dest->data = kmalloc(len, GFP_KERNEL);
203 if (unlikely(dest->data == NULL))
204 return ERR_PTR(-ENOMEM);
205 dest->len = len;
206 memcpy(dest->data, p, len);
207 return q;
208}
209
210static struct gss_cl_ctx *
211gss_cred_get_ctx(struct rpc_cred *cred)
212{
213 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
214 struct gss_cl_ctx *ctx = NULL;
215
216 read_lock(&gss_ctx_lock);
217 if (gss_cred->gc_ctx)
218 ctx = gss_get_ctx(gss_cred->gc_ctx);
219 read_unlock(&gss_ctx_lock);
220 return ctx;
221}
222
223static struct gss_cl_ctx *
224gss_alloc_context(void)
225{
226 struct gss_cl_ctx *ctx;
227
228 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
229 if (ctx != NULL) {
230 memset(ctx, 0, sizeof(*ctx));
231 ctx->gc_proc = RPC_GSS_PROC_DATA;
232 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
233 spin_lock_init(&ctx->gc_seq_lock);
234 atomic_set(&ctx->count,1);
235 }
236 return ctx;
237}
238
239#define GSSD_MIN_TIMEOUT (60 * 60)
240static const void *
241gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
242{
243 const void *q;
244 unsigned int seclen;
245 unsigned int timeout;
246 u32 window_size;
247 int ret;
248
249 /* First unsigned int gives the lifetime (in seconds) of the cred */
250 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
251 if (IS_ERR(p))
252 goto err;
253 if (timeout == 0)
254 timeout = GSSD_MIN_TIMEOUT;
255 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
256 /* Sequence number window. Determines the maximum number of simultaneous requests */
257 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
258 if (IS_ERR(p))
259 goto err;
260 ctx->gc_win = window_size;
261 /* gssd signals an error by passing ctx->gc_win = 0: */
262 if (ctx->gc_win == 0) {
263 /* in which case, p points to an error code which we ignore */
264 p = ERR_PTR(-EACCES);
265 goto err;
266 }
267 /* copy the opaque wire context */
268 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
269 if (IS_ERR(p))
270 goto err;
271 /* import the opaque security context */
272 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
273 if (IS_ERR(p))
274 goto err;
275 q = (const void *)((const char *)p + seclen);
276 if (unlikely(q > end || q < p)) {
277 p = ERR_PTR(-EFAULT);
278 goto err;
279 }
280 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
281 if (ret < 0) {
282 p = ERR_PTR(ret);
283 goto err;
284 }
285 return q;
286err:
287 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p));
288 return p;
289}
290
291
292struct gss_upcall_msg {
293 atomic_t count;
294 uid_t uid;
295 struct rpc_pipe_msg msg;
296 struct list_head list;
297 struct gss_auth *auth;
298 struct rpc_wait_queue rpc_waitqueue;
299 wait_queue_head_t waitqueue;
300 struct gss_cl_ctx *ctx;
301};
302
303static void
304gss_release_msg(struct gss_upcall_msg *gss_msg)
305{
306 if (!atomic_dec_and_test(&gss_msg->count))
307 return;
308 BUG_ON(!list_empty(&gss_msg->list));
309 if (gss_msg->ctx != NULL)
310 gss_put_ctx(gss_msg->ctx);
311 kfree(gss_msg);
312}
313
314static struct gss_upcall_msg *
315__gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
316{
317 struct gss_upcall_msg *pos;
318 list_for_each_entry(pos, &gss_auth->upcalls, list) {
319 if (pos->uid != uid)
320 continue;
321 atomic_inc(&pos->count);
322 dprintk("RPC: gss_find_upcall found msg %p\n", pos);
323 return pos;
324 }
325 dprintk("RPC: gss_find_upcall found nothing\n");
326 return NULL;
327}
328
329/* Try to add a upcall to the pipefs queue.
330 * If an upcall owned by our uid already exists, then we return a reference
331 * to that upcall instead of adding the new upcall.
332 */
333static inline struct gss_upcall_msg *
334gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
335{
336 struct gss_upcall_msg *old;
337
338 spin_lock(&gss_auth->lock);
339 old = __gss_find_upcall(gss_auth, gss_msg->uid);
340 if (old == NULL) {
341 atomic_inc(&gss_msg->count);
342 list_add(&gss_msg->list, &gss_auth->upcalls);
343 } else
344 gss_msg = old;
345 spin_unlock(&gss_auth->lock);
346 return gss_msg;
347}
348
349static void
350__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
351{
352 if (list_empty(&gss_msg->list))
353 return;
354 list_del_init(&gss_msg->list);
355 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
356 wake_up_all(&gss_msg->waitqueue);
357 atomic_dec(&gss_msg->count);
358}
359
360static void
361gss_unhash_msg(struct gss_upcall_msg *gss_msg)
362{
363 struct gss_auth *gss_auth = gss_msg->auth;
364
365 spin_lock(&gss_auth->lock);
366 __gss_unhash_msg(gss_msg);
367 spin_unlock(&gss_auth->lock);
368}
369
370static void
371gss_upcall_callback(struct rpc_task *task)
372{
373 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
374 struct gss_cred, gc_base);
375 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
376
377 BUG_ON(gss_msg == NULL);
378 if (gss_msg->ctx)
379 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
380 else
381 task->tk_status = gss_msg->msg.errno;
382 spin_lock(&gss_msg->auth->lock);
383 gss_cred->gc_upcall = NULL;
384 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
385 spin_unlock(&gss_msg->auth->lock);
386 gss_release_msg(gss_msg);
387}
388
389static inline struct gss_upcall_msg *
390gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
391{
392 struct gss_upcall_msg *gss_msg;
393
394 gss_msg = kmalloc(sizeof(*gss_msg), GFP_KERNEL);
395 if (gss_msg != NULL) {
396 memset(gss_msg, 0, sizeof(*gss_msg));
397 INIT_LIST_HEAD(&gss_msg->list);
398 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
399 init_waitqueue_head(&gss_msg->waitqueue);
400 atomic_set(&gss_msg->count, 1);
401 gss_msg->msg.data = &gss_msg->uid;
402 gss_msg->msg.len = sizeof(gss_msg->uid);
403 gss_msg->uid = uid;
404 gss_msg->auth = gss_auth;
405 }
406 return gss_msg;
407}
408
409static struct gss_upcall_msg *
410gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
411{
412 struct gss_upcall_msg *gss_new, *gss_msg;
413
414 gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
415 if (gss_new == NULL)
416 return ERR_PTR(-ENOMEM);
417 gss_msg = gss_add_msg(gss_auth, gss_new);
418 if (gss_msg == gss_new) {
419 int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg);
420 if (res) {
421 gss_unhash_msg(gss_new);
422 gss_msg = ERR_PTR(res);
423 }
424 } else
425 gss_release_msg(gss_new);
426 return gss_msg;
427}
428
429static inline int
430gss_refresh_upcall(struct rpc_task *task)
431{
432 struct rpc_cred *cred = task->tk_msg.rpc_cred;
433 struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth,
434 struct gss_auth, rpc_auth);
435 struct gss_cred *gss_cred = container_of(cred,
436 struct gss_cred, gc_base);
437 struct gss_upcall_msg *gss_msg;
438 int err = 0;
439
440 dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid);
441 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
442 if (IS_ERR(gss_msg)) {
443 err = PTR_ERR(gss_msg);
444 goto out;
445 }
446 spin_lock(&gss_auth->lock);
447 if (gss_cred->gc_upcall != NULL)
448 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
449 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
450 task->tk_timeout = 0;
451 gss_cred->gc_upcall = gss_msg;
452 /* gss_upcall_callback will release the reference to gss_upcall_msg */
453 atomic_inc(&gss_msg->count);
454 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
455 } else
456 err = gss_msg->msg.errno;
457 spin_unlock(&gss_auth->lock);
458 gss_release_msg(gss_msg);
459out:
460 dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid,
461 cred->cr_uid, err);
462 return err;
463}
464
465static inline int
466gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
467{
468 struct rpc_cred *cred = &gss_cred->gc_base;
469 struct gss_upcall_msg *gss_msg;
470 DEFINE_WAIT(wait);
471 int err = 0;
472
473 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
474 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
475 if (IS_ERR(gss_msg)) {
476 err = PTR_ERR(gss_msg);
477 goto out;
478 }
479 for (;;) {
480 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
481 spin_lock(&gss_auth->lock);
482 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
483 spin_unlock(&gss_auth->lock);
484 break;
485 }
486 spin_unlock(&gss_auth->lock);
487 if (signalled()) {
488 err = -ERESTARTSYS;
489 goto out_intr;
490 }
491 schedule();
492 }
493 if (gss_msg->ctx)
494 gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx));
495 else
496 err = gss_msg->msg.errno;
497out_intr:
498 finish_wait(&gss_msg->waitqueue, &wait);
499 gss_release_msg(gss_msg);
500out:
501 dprintk("RPC: gss_create_upcall for uid %u result %d\n", cred->cr_uid, err);
502 return err;
503}
504
505static ssize_t
506gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
507 char __user *dst, size_t buflen)
508{
509 char *data = (char *)msg->data + msg->copied;
510 ssize_t mlen = msg->len;
511 ssize_t left;
512
513 if (mlen > buflen)
514 mlen = buflen;
515 left = copy_to_user(dst, data, mlen);
516 if (left < 0) {
517 msg->errno = left;
518 return left;
519 }
520 mlen -= left;
521 msg->copied += mlen;
522 msg->errno = 0;
523 return mlen;
524}
525
526#define MSG_BUF_MAXSIZE 1024
527
528static ssize_t
529gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
530{
531 const void *p, *end;
532 void *buf;
533 struct rpc_clnt *clnt;
534 struct gss_auth *gss_auth;
535 struct rpc_cred *cred;
536 struct gss_upcall_msg *gss_msg;
537 struct gss_cl_ctx *ctx;
538 uid_t uid;
539 int err = -EFBIG;
540
541 if (mlen > MSG_BUF_MAXSIZE)
542 goto out;
543 err = -ENOMEM;
544 buf = kmalloc(mlen, GFP_KERNEL);
545 if (!buf)
546 goto out;
547
548 clnt = RPC_I(filp->f_dentry->d_inode)->private;
549 err = -EFAULT;
550 if (copy_from_user(buf, src, mlen))
551 goto err;
552
553 end = (const void *)((char *)buf + mlen);
554 p = simple_get_bytes(buf, end, &uid, sizeof(uid));
555 if (IS_ERR(p)) {
556 err = PTR_ERR(p);
557 goto err;
558 }
559
560 err = -ENOMEM;
561 ctx = gss_alloc_context();
562 if (ctx == NULL)
563 goto err;
564 err = 0;
565 gss_auth = container_of(clnt->cl_auth, struct gss_auth, rpc_auth);
566 p = gss_fill_context(p, end, ctx, gss_auth->mech);
567 if (IS_ERR(p)) {
568 err = PTR_ERR(p);
569 if (err != -EACCES)
570 goto err_put_ctx;
571 }
572 spin_lock(&gss_auth->lock);
573 gss_msg = __gss_find_upcall(gss_auth, uid);
574 if (gss_msg) {
575 if (err == 0 && gss_msg->ctx == NULL)
576 gss_msg->ctx = gss_get_ctx(ctx);
577 gss_msg->msg.errno = err;
578 __gss_unhash_msg(gss_msg);
579 spin_unlock(&gss_auth->lock);
580 gss_release_msg(gss_msg);
581 } else {
582 struct auth_cred acred = { .uid = uid };
583 spin_unlock(&gss_auth->lock);
8a317760 584 cred = rpcauth_lookup_credcache(clnt->cl_auth, &acred, RPCAUTH_LOOKUP_NEW);
1da177e4
LT		 585 if (IS_ERR(cred)) {
586 err = PTR_ERR(cred);
587 goto err_put_ctx;
588 }
589 gss_cred_set_ctx(cred, gss_get_ctx(ctx));
590 }
591 gss_put_ctx(ctx);
592 kfree(buf);
593 dprintk("RPC: gss_pipe_downcall returning length %Zu\n", mlen);
594 return mlen;
595err_put_ctx:
596 gss_put_ctx(ctx);
597err:
598 kfree(buf);
599out:
600 dprintk("RPC: gss_pipe_downcall returning %d\n", err);
601 return err;
602}
603
604static void
605gss_pipe_release(struct inode *inode)
606{
607 struct rpc_inode *rpci = RPC_I(inode);
608 struct rpc_clnt *clnt;
609 struct rpc_auth *auth;
610 struct gss_auth *gss_auth;
611
612 clnt = rpci->private;
613 auth = clnt->cl_auth;
614 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
615 spin_lock(&gss_auth->lock);
616 while (!list_empty(&gss_auth->upcalls)) {
617 struct gss_upcall_msg *gss_msg;
618
619 gss_msg = list_entry(gss_auth->upcalls.next,
620 struct gss_upcall_msg, list);
621 gss_msg->msg.errno = -EPIPE;
622 atomic_inc(&gss_msg->count);
623 __gss_unhash_msg(gss_msg);
624 spin_unlock(&gss_auth->lock);
625 gss_release_msg(gss_msg);
626 spin_lock(&gss_auth->lock);
627 }
628 spin_unlock(&gss_auth->lock);
629}
630
631static void
632gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
633{
634 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
635 static unsigned long ratelimit;
636
637 if (msg->errno < 0) {
638 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
639 gss_msg);
640 atomic_inc(&gss_msg->count);
641 gss_unhash_msg(gss_msg);
48e49187 642 if (msg->errno == -ETIMEDOUT) {
1da177e4
LT		 643 unsigned long now = jiffies;
644 if (time_after(now, ratelimit)) {
645 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
646 "Please check user daemon is running!\n");
647 ratelimit = now + 15*HZ;
648 }
649 }
650 gss_release_msg(gss_msg);
651 }
652}
653
654/*
655 * NOTE: we have the opportunity to use different
656 * parameters based on the input flavor (which must be a pseudoflavor)
657 */
658static struct rpc_auth *
659gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
660{
661 struct gss_auth *gss_auth;
662 struct rpc_auth * auth;
6a19275a 663 int err = -ENOMEM; /* XXX? */
1da177e4
LT		 664
665 dprintk("RPC: creating GSS authenticator for client %p\n",clnt);
666
667 if (!try_module_get(THIS_MODULE))
6a19275a 668 return ERR_PTR(err);
1da177e4
LT		 669 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
670 goto out_dec;
671 gss_auth->client = clnt;
6a19275a 672 err = -EINVAL;
1da177e4
LT		 673 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
674 if (!gss_auth->mech) {
675 printk(KERN_WARNING "%s: Pseudoflavor %d not found!",
676 __FUNCTION__, flavor);
677 goto err_free;
678 }
679 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
438b6fde
BF		 680 if (gss_auth->service == 0)
681 goto err_put_mech;
1da177e4
LT		 682 INIT_LIST_HEAD(&gss_auth->upcalls);
683 spin_lock_init(&gss_auth->lock);
684 auth = &gss_auth->rpc_auth;
685 auth->au_cslack = GSS_CRED_SLACK >> 2;
686 auth->au_rslack = GSS_VERF_SLACK >> 2;
687 auth->au_ops = &authgss_ops;
688 auth->au_flavor = flavor;
689 atomic_set(&auth->au_count, 1);
690
6a19275a
BF		 691 err = rpcauth_init_credcache(auth, GSS_CRED_EXPIRE);
692 if (err)
1da177e4
LT		 693 goto err_put_mech;
694
f134585a
TM		 695 snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s",
696 clnt->cl_pathname,
697 gss_auth->mech->gm_name);
698 gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
6a19275a
BF		 699 if (IS_ERR(gss_auth->dentry)) {
700 err = PTR_ERR(gss_auth->dentry);
1da177e4 701 goto err_put_mech;
6a19275a 702 }
1da177e4
LT		 703
704 return auth;
705err_put_mech:
706 gss_mech_put(gss_auth->mech);
707err_free:
708 kfree(gss_auth);
709out_dec:
710 module_put(THIS_MODULE);
6a19275a 711 return ERR_PTR(err);
1da177e4
LT		 712}
713
714static void
715gss_destroy(struct rpc_auth *auth)
716{
717 struct gss_auth *gss_auth;
718
719 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
720 auth, auth->au_flavor);
721
722 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
f134585a 723 rpc_unlink(gss_auth->path);
12de3b35
TM		 724 dput(gss_auth->dentry);
725 gss_auth->dentry = NULL;
1da177e4
LT		 726 gss_mech_put(gss_auth->mech);
727
728 rpcauth_free_credcache(auth);
729 kfree(gss_auth);
730 module_put(THIS_MODULE);
731}
732
733/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
734 * to create a new cred or context, so they check that things have been
735 * allocated before freeing them. */
736static void
737gss_destroy_ctx(struct gss_cl_ctx *ctx)
738{
739 dprintk("RPC: gss_destroy_ctx\n");
740
741 if (ctx->gc_gss_ctx)
742 gss_delete_sec_context(&ctx->gc_gss_ctx);
743
744 kfree(ctx->gc_wire_ctx.data);
745 kfree(ctx);
746}
747
748static void
749gss_destroy_cred(struct rpc_cred *rc)
750{
751 struct gss_cred *cred = container_of(rc, struct gss_cred, gc_base);
752
753 dprintk("RPC: gss_destroy_cred \n");
754
755 if (cred->gc_ctx)
756 gss_put_ctx(cred->gc_ctx);
757 kfree(cred);
758}
759
760/*
761 * Lookup RPCSEC_GSS cred for the current process
762 */
763static struct rpc_cred *
8a317760 764gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1da177e4 765{
8a317760 766 return rpcauth_lookup_credcache(auth, acred, flags);
1da177e4
LT		 767}
768
769static struct rpc_cred *
8a317760 770gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1da177e4
LT		 771{
772 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
773 struct gss_cred *cred = NULL;
774 int err = -ENOMEM;
775
776 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
777 acred->uid, auth->au_flavor);
778
779 if (!(cred = kmalloc(sizeof(*cred), GFP_KERNEL)))
780 goto out_err;
781
782 memset(cred, 0, sizeof(*cred));
783 atomic_set(&cred->gc_count, 1);
784 cred->gc_uid = acred->uid;
785 /*
786 * Note: in order to force a call to call_refresh(), we deliberately
787 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
788 */
789 cred->gc_flags = 0;
790 cred->gc_base.cr_ops = &gss_credops;
8a317760 791 cred->gc_base.cr_flags = RPCAUTH_CRED_NEW;
1da177e4 792 cred->gc_service = gss_auth->service;
1da177e4
LT		 793 return &cred->gc_base;
794
795out_err:
796 dprintk("RPC: gss_create_cred failed with error %d\n", err);
1da177e4
LT		 797 return ERR_PTR(err);
798}
799
fba3bad4
TM		 800static int
801gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
802{
803 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
804 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
805 int err;
806
807 do {
808 err = gss_create_upcall(gss_auth, gss_cred);
809 } while (err == -EAGAIN);
810 return err;
811}
812
1da177e4 813static int
8a317760 814gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1da177e4
LT		 815{
816 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
817
8a317760
TM		 818 /*
819 * If the searchflags have set RPCAUTH_LOOKUP_NEW, then
820 * we don't really care if the credential has expired or not,
821 * since the caller should be prepared to reinitialise it.
822 */
823 if ((flags & RPCAUTH_LOOKUP_NEW) && (rc->cr_flags & RPCAUTH_CRED_NEW))
824 goto out;
1da177e4
LT		 825 /* Don't match with creds that have expired. */
826 if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
827 return 0;
8a317760 828out:
1da177e4
LT		 829 return (rc->cr_uid == acred->uid);
830}
831
832/*
833* Marshal credentials.
834* Maybe we should keep a cached credential for performance reasons.
835*/
836static u32 *
837gss_marshal(struct rpc_task *task, u32 *p)
838{
839 struct rpc_cred *cred = task->tk_msg.rpc_cred;
840 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
841 gc_base);
842 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
843 u32 *cred_len;
844 struct rpc_rqst *req = task->tk_rqstp;
845 u32 maj_stat = 0;
846 struct xdr_netobj mic;
847 struct kvec iov;
848 struct xdr_buf verf_buf;
849
850 dprintk("RPC: %4u gss_marshal\n", task->tk_pid);
851
852 *p++ = htonl(RPC_AUTH_GSS);
853 cred_len = p++;
854
855 spin_lock(&ctx->gc_seq_lock);
856 req->rq_seqno = ctx->gc_seq++;
857 spin_unlock(&ctx->gc_seq_lock);
858
859 *p++ = htonl((u32) RPC_GSS_VERSION);
860 *p++ = htonl((u32) ctx->gc_proc);
861 *p++ = htonl((u32) req->rq_seqno);
862 *p++ = htonl((u32) gss_cred->gc_service);
863 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
864 *cred_len = htonl((p - (cred_len + 1)) << 2);
865
866 /* We compute the checksum for the verifier over the xdr-encoded bytes
867 * starting with the xid and ending at the end of the credential: */
808012fb
CL		 868 iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
869 req->rq_snd_buf.head[0].iov_base);
1da177e4
LT		 870 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
871 xdr_buf_from_iov(&iov, &verf_buf);
872
873 /* set verifier flavor*/
874 *p++ = htonl(RPC_AUTH_GSS);
875
876 mic.data = (u8 *)(p + 1);
00fd6e14 877 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1da177e4
LT		 878 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
879 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
880 } else if (maj_stat != 0) {
881 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
882 goto out_put_ctx;
883 }
884 p = xdr_encode_opaque(p, NULL, mic.len);
885 gss_put_ctx(ctx);
886 return p;
887out_put_ctx:
888 gss_put_ctx(ctx);
889 return NULL;
890}
891
892/*
893* Refresh credentials. XXX - finish
894*/
895static int
896gss_refresh(struct rpc_task *task)
897{
898
899 if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred))
900 return gss_refresh_upcall(task);
901 return 0;
902}
903
904static u32 *
905gss_validate(struct rpc_task *task, u32 *p)
906{
907 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1da177e4 908 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
00fd6e14 909 u32 seq;
1da177e4
LT		 910 struct kvec iov;
911 struct xdr_buf verf_buf;
912 struct xdr_netobj mic;
913 u32 flav,len;
914 u32 maj_stat;
915
916 dprintk("RPC: %4u gss_validate\n", task->tk_pid);
917
918 flav = ntohl(*p++);
919 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
920 goto out_bad;
921 if (flav != RPC_AUTH_GSS)
922 goto out_bad;
923 seq = htonl(task->tk_rqstp->rq_seqno);
924 iov.iov_base = &seq;
925 iov.iov_len = sizeof(seq);
926 xdr_buf_from_iov(&iov, &verf_buf);
927 mic.data = (u8 *)p;
928 mic.len = len;
929
00fd6e14 930 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1da177e4
LT		 931 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
932 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
933 if (maj_stat)
934 goto out_bad;
24b2605b
BF		 935 /* We leave it to unwrap to calculate au_rslack. For now we just
936 * calculate the length of the verifier: */
937 task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1da177e4
LT		 938 gss_put_ctx(ctx);
939 dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
940 task->tk_pid);
941 return p + XDR_QUADLEN(len);
942out_bad:
943 gss_put_ctx(ctx);
944 dprintk("RPC: %4u gss_validate failed.\n", task->tk_pid);
945 return NULL;
946}
947
948static inline int
949gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
950 kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj)
951{
952 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
953 struct xdr_buf integ_buf;
954 u32 *integ_len = NULL;
955 struct xdr_netobj mic;
956 u32 offset, *q;
957 struct kvec *iov;
958 u32 maj_stat = 0;
959 int status = -EIO;
960
961 integ_len = p++;
962 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
963 *p++ = htonl(rqstp->rq_seqno);
964
965 status = encode(rqstp, p, obj);
966 if (status)
967 return status;
968
969 if (xdr_buf_subsegment(snd_buf, &integ_buf,
970 offset, snd_buf->len - offset))
971 return status;
972 *integ_len = htonl(integ_buf.len);
973
974 /* guess whether we're in the head or the tail: */
975 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
976 iov = snd_buf->tail;
977 else
978 iov = snd_buf->head;
979 p = iov->iov_base + iov->iov_len;
980 mic.data = (u8 *)(p + 1);
981
00fd6e14 982 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1da177e4
LT		 983 status = -EIO; /* XXX? */
984 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
985 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
986 else if (maj_stat)
987 return status;
988 q = xdr_encode_opaque(p, NULL, mic.len);
989
990 offset = (u8 *)q - (u8 *)p;
991 iov->iov_len += offset;
992 snd_buf->len += offset;
993 return 0;
994}
995
2d2da60c
BF		 996static void
997priv_release_snd_buf(struct rpc_rqst *rqstp)
998{
999 int i;
1000
1001 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1002 __free_page(rqstp->rq_enc_pages[i]);
1003 kfree(rqstp->rq_enc_pages);
1004}
1005
1006static int
1007alloc_enc_pages(struct rpc_rqst *rqstp)
1008{
1009 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1010 int first, last, i;
1011
1012 if (snd_buf->page_len == 0) {
1013 rqstp->rq_enc_pages_num = 0;
1014 return 0;
1015 }
1016
1017 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1018 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1019 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1020 rqstp->rq_enc_pages
1021 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1022 GFP_NOFS);
1023 if (!rqstp->rq_enc_pages)
1024 goto out;
1025 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1026 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1027 if (rqstp->rq_enc_pages[i] == NULL)
1028 goto out_free;
1029 }
1030 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1031 return 0;
1032out_free:
1033 for (i--; i >= 0; i--) {
1034 __free_page(rqstp->rq_enc_pages[i]);
1035 }
1036out:
1037 return -EAGAIN;
1038}
1039
1040static inline int
1041gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1042 kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj)
1043{
1044 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1045 u32 offset;
1046 u32 maj_stat;
1047 int status;
1048 u32 *opaque_len;
1049 struct page **inpages;
1050 int first;
1051 int pad;
1052 struct kvec *iov;
1053 char *tmp;
1054
1055 opaque_len = p++;
1056 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1057 *p++ = htonl(rqstp->rq_seqno);
1058
1059 status = encode(rqstp, p, obj);
1060 if (status)
1061 return status;
1062
1063 status = alloc_enc_pages(rqstp);
1064 if (status)
1065 return status;
1066 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1067 inpages = snd_buf->pages + first;
1068 snd_buf->pages = rqstp->rq_enc_pages;
1069 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1070 /* Give the tail its own page, in case we need extra space in the
1071 * head when wrapping: */
1072 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1073 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1074 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1075 snd_buf->tail[0].iov_base = tmp;
1076 }
00fd6e14 1077 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
2d2da60c
BF		 1078 /* RPC_SLACK_SPACE should prevent this ever happening: */
1079 BUG_ON(snd_buf->len > snd_buf->buflen);
1080 status = -EIO;
1081 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1082 * done anyway, so it's safe to put the request on the wire: */
1083 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1084 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
1085 else if (maj_stat)
1086 return status;
1087
1088 *opaque_len = htonl(snd_buf->len - offset);
1089 /* guess whether we're in the head or the tail: */
1090 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1091 iov = snd_buf->tail;
1092 else
1093 iov = snd_buf->head;
1094 p = iov->iov_base + iov->iov_len;
1095 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1096 memset(p, 0, pad);
1097 iov->iov_len += pad;
1098 snd_buf->len += pad;
1099
1100 return 0;
1101}
1102
1da177e4
LT		 1103static int
1104gss_wrap_req(struct rpc_task *task,
1105 kxdrproc_t encode, void *rqstp, u32 *p, void *obj)
1106{
1107 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1108 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1109 gc_base);
1110 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1111 int status = -EIO;
1112
1113 dprintk("RPC: %4u gss_wrap_req\n", task->tk_pid);
1114 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1115 /* The spec seems a little ambiguous here, but I think that not
1116 * wrapping context destruction requests makes the most sense.
1117 */
1118 status = encode(rqstp, p, obj);
1119 goto out;
1120 }
1121 switch (gss_cred->gc_service) {
1122 case RPC_GSS_SVC_NONE:
1123 status = encode(rqstp, p, obj);
1124 break;
1125 case RPC_GSS_SVC_INTEGRITY:
1126 status = gss_wrap_req_integ(cred, ctx, encode,
1127 rqstp, p, obj);
1128 break;
1129 case RPC_GSS_SVC_PRIVACY:
2d2da60c
BF		 1130 status = gss_wrap_req_priv(cred, ctx, encode,
1131 rqstp, p, obj);
1da177e4
LT		 1132 break;
1133 }
1134out:
1135 gss_put_ctx(ctx);
1136 dprintk("RPC: %4u gss_wrap_req returning %d\n", task->tk_pid, status);
1137 return status;
1138}
1139
1140static inline int
1141gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1142 struct rpc_rqst *rqstp, u32 **p)
1143{
1144 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1145 struct xdr_buf integ_buf;
1146 struct xdr_netobj mic;
1147 u32 data_offset, mic_offset;
1148 u32 integ_len;
1149 u32 maj_stat;
1150 int status = -EIO;
1151
1152 integ_len = ntohl(*(*p)++);
1153 if (integ_len & 3)
1154 return status;
1155 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1156 mic_offset = integ_len + data_offset;
1157 if (mic_offset > rcv_buf->len)
1158 return status;
1159 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1160 return status;
1161
1162 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1163 mic_offset - data_offset))
1164 return status;
1165
1166 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1167 return status;
1168
00fd6e14 1169 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1da177e4
LT		 1170 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1171 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
1172 if (maj_stat != GSS_S_COMPLETE)
1173 return status;
1174 return 0;
1175}
1176
2d2da60c
BF		 1177static inline int
1178gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1179 struct rpc_rqst *rqstp, u32 **p)
1180{
1181 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1182 u32 offset;
1183 u32 opaque_len;
1184 u32 maj_stat;
1185 int status = -EIO;
1186
1187 opaque_len = ntohl(*(*p)++);
1188 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1189 if (offset + opaque_len > rcv_buf->len)
1190 return status;
1191 /* remove padding: */
1192 rcv_buf->len = offset + opaque_len;
1193
00fd6e14 1194 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
2d2da60c
BF		 1195 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1196 cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
1197 if (maj_stat != GSS_S_COMPLETE)
1198 return status;
1199 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1200 return status;
1201
1202 return 0;
1203}
1204
1205
1da177e4
LT		 1206static int
1207gss_unwrap_resp(struct rpc_task *task,
1208 kxdrproc_t decode, void *rqstp, u32 *p, void *obj)
1209{
1210 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1211 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1212 gc_base);
1213 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
24b2605b 1214 u32 *savedp = p;
2d2da60c
BF		 1215 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1216 int savedlen = head->iov_len;
1da177e4
LT		 1217 int status = -EIO;
1218
1219 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1220 goto out_decode;
1221 switch (gss_cred->gc_service) {
1222 case RPC_GSS_SVC_NONE:
1223 break;
1224 case RPC_GSS_SVC_INTEGRITY:
1225 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1226 if (status)
1227 goto out;
1228 break;
1229 case RPC_GSS_SVC_PRIVACY:
2d2da60c
BF		 1230 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1231 if (status)
1232 goto out;
1da177e4
LT		 1233 break;
1234 }
24b2605b 1235 /* take into account extra slack for integrity and privacy cases: */
2d2da60c
BF		 1236 task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp)
1237 + (savedlen - head->iov_len);
1da177e4
LT		 1238out_decode:
1239 status = decode(rqstp, p, obj);
1240out:
1241 gss_put_ctx(ctx);
1242 dprintk("RPC: %4u gss_unwrap_resp returning %d\n", task->tk_pid,
1243 status);
1244 return status;
1245}
1246
1247static struct rpc_authops authgss_ops = {
1248 .owner = THIS_MODULE,
1249 .au_flavor = RPC_AUTH_GSS,
1250#ifdef RPC_DEBUG
1251 .au_name = "RPCSEC_GSS",
1252#endif
1253 .create = gss_create,
1254 .destroy = gss_destroy,
1255 .lookup_cred = gss_lookup_cred,
1256 .crcreate = gss_create_cred
1257};
1258
1259static struct rpc_credops gss_credops = {
1260 .cr_name = "AUTH_GSS",
1261 .crdestroy = gss_destroy_cred,
fba3bad4 1262 .cr_init = gss_cred_init,
1da177e4
LT		 1263 .crmatch = gss_match,
1264 .crmarshal = gss_marshal,
1265 .crrefresh = gss_refresh,
1266 .crvalidate = gss_validate,
1267 .crwrap_req = gss_wrap_req,
1268 .crunwrap_resp = gss_unwrap_resp,
1269};
1270
1271static struct rpc_pipe_ops gss_upcall_ops = {
1272 .upcall = gss_pipe_upcall,
1273 .downcall = gss_pipe_downcall,
1274 .destroy_msg = gss_pipe_destroy_msg,
1275 .release_pipe = gss_pipe_release,
1276};
1277
1278/*
1279 * Initialize RPCSEC_GSS module
1280 */
1281static int __init init_rpcsec_gss(void)
1282{
1283 int err = 0;
1284
1285 err = rpcauth_register(&authgss_ops);
1286 if (err)
1287 goto out;
1288 err = gss_svc_init();
1289 if (err)
1290 goto out_unregister;
1291 return 0;
1292out_unregister:
1293 rpcauth_unregister(&authgss_ops);
1294out:
1295 return err;
1296}
1297
1298static void __exit exit_rpcsec_gss(void)
1299{
1300 gss_svc_shutdown();
1301 rpcauth_unregister(&authgss_ops);
1302}
1303
1304MODULE_LICENSE("GPL");
1305module_init(init_rpcsec_gss)
1306module_exit(exit_rpcsec_gss)
Linux 6.x block layer and io_uring tree(s)