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rpc: track number of users of the gss upcall pipe
[linux-2.6-block.git] / net / sunrpc / auth_gss / auth_gss.c
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1/*
2 * linux/net/sunrpc/auth_gss/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
38
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>
54
55static const struct rpc_authops authgss_ops;
56
57static const struct rpc_credops gss_credops;
58static const struct rpc_credops gss_nullops;
59
60#ifdef RPC_DEBUG
61# define RPCDBG_FACILITY RPCDBG_AUTH
62#endif
63
64#define GSS_CRED_SLACK 1024
65/* length of a krb5 verifier (48), plus data added before arguments when
66 * using integrity (two 4-byte integers): */
67#define GSS_VERF_SLACK 100
68
69struct gss_auth {
70 struct kref kref;
71 struct rpc_auth rpc_auth;
72 struct gss_api_mech *mech;
73 enum rpc_gss_svc service;
74 struct rpc_clnt *client;
75 struct dentry *dentry;
76};
77
78static atomic_t pipe_users = ATOMIC_INIT(0);
79
80static void gss_free_ctx(struct gss_cl_ctx *);
81static struct rpc_pipe_ops gss_upcall_ops;
82
83static inline struct gss_cl_ctx *
84gss_get_ctx(struct gss_cl_ctx *ctx)
85{
86 atomic_inc(&ctx->count);
87 return ctx;
88}
89
90static inline void
91gss_put_ctx(struct gss_cl_ctx *ctx)
92{
93 if (atomic_dec_and_test(&ctx->count))
94 gss_free_ctx(ctx);
95}
96
97/* gss_cred_set_ctx:
98 * called by gss_upcall_callback and gss_create_upcall in order
99 * to set the gss context. The actual exchange of an old context
100 * and a new one is protected by the inode->i_lock.
101 */
102static void
103gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
104{
105 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
106
107 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
108 return;
109 gss_get_ctx(ctx);
110 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
111 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
112 smp_mb__before_clear_bit();
113 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
114}
115
116static const void *
117simple_get_bytes(const void *p, const void *end, void *res, size_t len)
118{
119 const void *q = (const void *)((const char *)p + len);
120 if (unlikely(q > end || q < p))
121 return ERR_PTR(-EFAULT);
122 memcpy(res, p, len);
123 return q;
124}
125
126static inline const void *
127simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
128{
129 const void *q;
130 unsigned int len;
131
132 p = simple_get_bytes(p, end, &len, sizeof(len));
133 if (IS_ERR(p))
134 return p;
135 q = (const void *)((const char *)p + len);
136 if (unlikely(q > end || q < p))
137 return ERR_PTR(-EFAULT);
138 dest->data = kmemdup(p, len, GFP_NOFS);
139 if (unlikely(dest->data == NULL))
140 return ERR_PTR(-ENOMEM);
141 dest->len = len;
142 return q;
143}
144
145static struct gss_cl_ctx *
146gss_cred_get_ctx(struct rpc_cred *cred)
147{
148 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
149 struct gss_cl_ctx *ctx = NULL;
150
151 rcu_read_lock();
152 if (gss_cred->gc_ctx)
153 ctx = gss_get_ctx(gss_cred->gc_ctx);
154 rcu_read_unlock();
155 return ctx;
156}
157
158static struct gss_cl_ctx *
159gss_alloc_context(void)
160{
161 struct gss_cl_ctx *ctx;
162
163 ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
164 if (ctx != NULL) {
165 ctx->gc_proc = RPC_GSS_PROC_DATA;
166 ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */
167 spin_lock_init(&ctx->gc_seq_lock);
168 atomic_set(&ctx->count,1);
169 }
170 return ctx;
171}
172
173#define GSSD_MIN_TIMEOUT (60 * 60)
174static const void *
175gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
176{
177 const void *q;
178 unsigned int seclen;
179 unsigned int timeout;
180 u32 window_size;
181 int ret;
182
183 /* First unsigned int gives the lifetime (in seconds) of the cred */
184 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
185 if (IS_ERR(p))
186 goto err;
187 if (timeout == 0)
188 timeout = GSSD_MIN_TIMEOUT;
189 ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
190 /* Sequence number window. Determines the maximum number of simultaneous requests */
191 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
192 if (IS_ERR(p))
193 goto err;
194 ctx->gc_win = window_size;
195 /* gssd signals an error by passing ctx->gc_win = 0: */
196 if (ctx->gc_win == 0) {
197 /* in which case, p points to an error code which we ignore */
198 p = ERR_PTR(-EACCES);
199 goto err;
200 }
201 /* copy the opaque wire context */
202 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
203 if (IS_ERR(p))
204 goto err;
205 /* import the opaque security context */
206 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
207 if (IS_ERR(p))
208 goto err;
209 q = (const void *)((const char *)p + seclen);
210 if (unlikely(q > end || q < p)) {
211 p = ERR_PTR(-EFAULT);
212 goto err;
213 }
214 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
215 if (ret < 0) {
216 p = ERR_PTR(ret);
217 goto err;
218 }
219 return q;
220err:
221 dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p));
222 return p;
223}
224
225
226struct gss_upcall_msg {
227 atomic_t count;
228 uid_t uid;
229 struct rpc_pipe_msg msg;
230 struct list_head list;
231 struct gss_auth *auth;
232 struct rpc_wait_queue rpc_waitqueue;
233 wait_queue_head_t waitqueue;
234 struct gss_cl_ctx *ctx;
235};
236
237static void
238gss_release_msg(struct gss_upcall_msg *gss_msg)
239{
240 if (!atomic_dec_and_test(&gss_msg->count))
241 return;
242 atomic_dec(&pipe_users);
243 BUG_ON(!list_empty(&gss_msg->list));
244 if (gss_msg->ctx != NULL)
245 gss_put_ctx(gss_msg->ctx);
246 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
247 kfree(gss_msg);
248}
249
250static struct gss_upcall_msg *
251__gss_find_upcall(struct rpc_inode *rpci, uid_t uid)
252{
253 struct gss_upcall_msg *pos;
254 list_for_each_entry(pos, &rpci->in_downcall, list) {
255 if (pos->uid != uid)
256 continue;
257 atomic_inc(&pos->count);
258 dprintk("RPC: gss_find_upcall found msg %p\n", pos);
259 return pos;
260 }
261 dprintk("RPC: gss_find_upcall found nothing\n");
262 return NULL;
263}
264
265/* Try to add an upcall to the pipefs queue.
266 * If an upcall owned by our uid already exists, then we return a reference
267 * to that upcall instead of adding the new upcall.
268 */
269static inline struct gss_upcall_msg *
270gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
271{
272 struct inode *inode = gss_auth->dentry->d_inode;
273 struct rpc_inode *rpci = RPC_I(inode);
274 struct gss_upcall_msg *old;
275
276 spin_lock(&inode->i_lock);
277 old = __gss_find_upcall(rpci, gss_msg->uid);
278 if (old == NULL) {
279 atomic_inc(&gss_msg->count);
280 list_add(&gss_msg->list, &rpci->in_downcall);
281 } else
282 gss_msg = old;
283 spin_unlock(&inode->i_lock);
284 return gss_msg;
285}
286
287static void
288__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
289{
290 list_del_init(&gss_msg->list);
291 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
292 wake_up_all(&gss_msg->waitqueue);
293 atomic_dec(&gss_msg->count);
294}
295
296static void
297gss_unhash_msg(struct gss_upcall_msg *gss_msg)
298{
299 struct gss_auth *gss_auth = gss_msg->auth;
300 struct inode *inode = gss_auth->dentry->d_inode;
301
302 if (list_empty(&gss_msg->list))
303 return;
304 spin_lock(&inode->i_lock);
305 if (!list_empty(&gss_msg->list))
306 __gss_unhash_msg(gss_msg);
307 spin_unlock(&inode->i_lock);
308}
309
310static void
311gss_upcall_callback(struct rpc_task *task)
312{
313 struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
314 struct gss_cred, gc_base);
315 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
316 struct inode *inode = gss_msg->auth->dentry->d_inode;
317
318 spin_lock(&inode->i_lock);
319 if (gss_msg->ctx)
320 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
321 else
322 task->tk_status = gss_msg->msg.errno;
323 gss_cred->gc_upcall = NULL;
324 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
325 spin_unlock(&inode->i_lock);
326 gss_release_msg(gss_msg);
327}
328
329static inline struct gss_upcall_msg *
330gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
331{
332 struct gss_upcall_msg *gss_msg;
333
334 gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
335 if (gss_msg == NULL)
336 return ERR_PTR(-ENOMEM);
337 atomic_inc(&pipe_users);
338 INIT_LIST_HEAD(&gss_msg->list);
339 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
340 init_waitqueue_head(&gss_msg->waitqueue);
341 atomic_set(&gss_msg->count, 1);
342 gss_msg->msg.data = &gss_msg->uid;
343 gss_msg->msg.len = sizeof(gss_msg->uid);
344 gss_msg->uid = uid;
345 gss_msg->auth = gss_auth;
346 return gss_msg;
347}
348
349static struct gss_upcall_msg *
350gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
351{
352 struct gss_cred *gss_cred = container_of(cred,
353 struct gss_cred, gc_base);
354 struct gss_upcall_msg *gss_new, *gss_msg;
355 uid_t uid = cred->cr_uid;
356
357 /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */
358 if (gss_cred->gc_machine_cred != 0)
359 uid = 0;
360
361 gss_new = gss_alloc_msg(gss_auth, uid);
362 if (IS_ERR(gss_new))
363 return gss_new;
364 gss_msg = gss_add_msg(gss_auth, gss_new);
365 if (gss_msg == gss_new) {
366 int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg);
367 if (res) {
368 gss_unhash_msg(gss_new);
369 gss_msg = ERR_PTR(res);
370 }
371 } else
372 gss_release_msg(gss_new);
373 return gss_msg;
374}
375
376static void warn_gssd(void)
377{
378 static unsigned long ratelimit;
379 unsigned long now = jiffies;
380
381 if (time_after(now, ratelimit)) {
382 printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n"
383 "Please check user daemon is running.\n");
384 ratelimit = now + 15*HZ;
385 }
386}
387
388static inline int
389gss_refresh_upcall(struct rpc_task *task)
390{
391 struct rpc_cred *cred = task->tk_msg.rpc_cred;
392 struct gss_auth *gss_auth = container_of(cred->cr_auth,
393 struct gss_auth, rpc_auth);
394 struct gss_cred *gss_cred = container_of(cred,
395 struct gss_cred, gc_base);
396 struct gss_upcall_msg *gss_msg;
397 struct inode *inode = gss_auth->dentry->d_inode;
398 int err = 0;
399
400 dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid,
401 cred->cr_uid);
402 gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
403 if (IS_ERR(gss_msg)) {
404 err = PTR_ERR(gss_msg);
405 goto out;
406 }
407 spin_lock(&inode->i_lock);
408 if (gss_cred->gc_upcall != NULL)
409 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
410 else if (gss_msg->ctx != NULL) {
411 gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx);
412 gss_cred->gc_upcall = NULL;
413 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
414 } else if (gss_msg->msg.errno >= 0) {
415 task->tk_timeout = 0;
416 gss_cred->gc_upcall = gss_msg;
417 /* gss_upcall_callback will release the reference to gss_upcall_msg */
418 atomic_inc(&gss_msg->count);
419 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
420 } else
421 err = gss_msg->msg.errno;
422 spin_unlock(&inode->i_lock);
423 gss_release_msg(gss_msg);
424out:
425 dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n",
426 task->tk_pid, cred->cr_uid, err);
427 return err;
428}
429
430static inline int
431gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
432{
433 struct inode *inode = gss_auth->dentry->d_inode;
434 struct rpc_cred *cred = &gss_cred->gc_base;
435 struct gss_upcall_msg *gss_msg;
436 DEFINE_WAIT(wait);
437 int err = 0;
438
439 dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid);
440 gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred);
441 if (IS_ERR(gss_msg)) {
442 err = PTR_ERR(gss_msg);
443 goto out;
444 }
445 for (;;) {
446 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE);
447 spin_lock(&inode->i_lock);
448 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
449 break;
450 }
451 spin_unlock(&inode->i_lock);
452 if (signalled()) {
453 err = -ERESTARTSYS;
454 goto out_intr;
455 }
456 schedule();
457 }
458 if (gss_msg->ctx)
459 gss_cred_set_ctx(cred, gss_msg->ctx);
460 else
461 err = gss_msg->msg.errno;
462 spin_unlock(&inode->i_lock);
463out_intr:
464 finish_wait(&gss_msg->waitqueue, &wait);
465 gss_release_msg(gss_msg);
466out:
467 dprintk("RPC: gss_create_upcall for uid %u result %d\n",
468 cred->cr_uid, err);
469 return err;
470}
471
472static ssize_t
473gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg,
474 char __user *dst, size_t buflen)
475{
476 char *data = (char *)msg->data + msg->copied;
477 size_t mlen = min(msg->len, buflen);
478 unsigned long left;
479
480 left = copy_to_user(dst, data, mlen);
481 if (left == mlen) {
482 msg->errno = -EFAULT;
483 return -EFAULT;
484 }
485
486 mlen -= left;
487 msg->copied += mlen;
488 msg->errno = 0;
489 return mlen;
490}
491
492#define MSG_BUF_MAXSIZE 1024
493
494static ssize_t
495gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
496{
497 const void *p, *end;
498 void *buf;
499 struct gss_upcall_msg *gss_msg;
500 struct inode *inode = filp->f_path.dentry->d_inode;
501 struct gss_cl_ctx *ctx;
502 uid_t uid;
503 ssize_t err = -EFBIG;
504
505 if (mlen > MSG_BUF_MAXSIZE)
506 goto out;
507 err = -ENOMEM;
508 buf = kmalloc(mlen, GFP_NOFS);
509 if (!buf)
510 goto out;
511
512 err = -EFAULT;
513 if (copy_from_user(buf, src, mlen))
514 goto err;
515
516 end = (const void *)((char *)buf + mlen);
517 p = simple_get_bytes(buf, end, &uid, sizeof(uid));
518 if (IS_ERR(p)) {
519 err = PTR_ERR(p);
520 goto err;
521 }
522
523 err = -ENOMEM;
524 ctx = gss_alloc_context();
525 if (ctx == NULL)
526 goto err;
527
528 err = -ENOENT;
529 /* Find a matching upcall */
530 spin_lock(&inode->i_lock);
531 gss_msg = __gss_find_upcall(RPC_I(inode), uid);
532 if (gss_msg == NULL) {
533 spin_unlock(&inode->i_lock);
534 goto err_put_ctx;
535 }
536 list_del_init(&gss_msg->list);
537 spin_unlock(&inode->i_lock);
538
539 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
540 if (IS_ERR(p)) {
541 err = PTR_ERR(p);
542 gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES;
543 goto err_release_msg;
544 }
545 gss_msg->ctx = gss_get_ctx(ctx);
546 err = mlen;
547
548err_release_msg:
549 spin_lock(&inode->i_lock);
550 __gss_unhash_msg(gss_msg);
551 spin_unlock(&inode->i_lock);
552 gss_release_msg(gss_msg);
553err_put_ctx:
554 gss_put_ctx(ctx);
555err:
556 kfree(buf);
557out:
558 dprintk("RPC: gss_pipe_downcall returning %Zd\n", err);
559 return err;
560}
561
562static int
563gss_pipe_open(struct inode *inode)
564{
565 atomic_inc(&pipe_users);
566 return 0;
567}
568
569static void
570gss_pipe_release(struct inode *inode)
571{
572 struct rpc_inode *rpci = RPC_I(inode);
573 struct gss_upcall_msg *gss_msg;
574
575 spin_lock(&inode->i_lock);
576 while (!list_empty(&rpci->in_downcall)) {
577
578 gss_msg = list_entry(rpci->in_downcall.next,
579 struct gss_upcall_msg, list);
580 gss_msg->msg.errno = -EPIPE;
581 atomic_inc(&gss_msg->count);
582 __gss_unhash_msg(gss_msg);
583 spin_unlock(&inode->i_lock);
584 gss_release_msg(gss_msg);
585 spin_lock(&inode->i_lock);
586 }
587 spin_unlock(&inode->i_lock);
588
589 atomic_dec(&pipe_users);
590}
591
592static void
593gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
594{
595 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
596
597 if (msg->errno < 0) {
598 dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n",
599 gss_msg);
600 atomic_inc(&gss_msg->count);
601 gss_unhash_msg(gss_msg);
602 if (msg->errno == -ETIMEDOUT)
603 warn_gssd();
604 gss_release_msg(gss_msg);
605 }
606}
607
608/*
609 * NOTE: we have the opportunity to use different
610 * parameters based on the input flavor (which must be a pseudoflavor)
611 */
612static struct rpc_auth *
613gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
614{
615 struct gss_auth *gss_auth;
616 struct rpc_auth * auth;
617 int err = -ENOMEM; /* XXX? */
618
619 dprintk("RPC: creating GSS authenticator for client %p\n", clnt);
620
621 if (!try_module_get(THIS_MODULE))
622 return ERR_PTR(err);
623 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
624 goto out_dec;
625 gss_auth->client = clnt;
626 err = -EINVAL;
627 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
628 if (!gss_auth->mech) {
629 printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n",
630 __func__, flavor);
631 goto err_free;
632 }
633 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
634 if (gss_auth->service == 0)
635 goto err_put_mech;
636 auth = &gss_auth->rpc_auth;
637 auth->au_cslack = GSS_CRED_SLACK >> 2;
638 auth->au_rslack = GSS_VERF_SLACK >> 2;
639 auth->au_ops = &authgss_ops;
640 auth->au_flavor = flavor;
641 atomic_set(&auth->au_count, 1);
642 kref_init(&gss_auth->kref);
643
644 gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name,
645 clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
646 if (IS_ERR(gss_auth->dentry)) {
647 err = PTR_ERR(gss_auth->dentry);
648 goto err_put_mech;
649 }
650
651 err = rpcauth_init_credcache(auth);
652 if (err)
653 goto err_unlink_pipe;
654
655 return auth;
656err_unlink_pipe:
657 rpc_unlink(gss_auth->dentry);
658err_put_mech:
659 gss_mech_put(gss_auth->mech);
660err_free:
661 kfree(gss_auth);
662out_dec:
663 module_put(THIS_MODULE);
664 return ERR_PTR(err);
665}
666
667static void
668gss_free(struct gss_auth *gss_auth)
669{
670 rpc_unlink(gss_auth->dentry);
671 gss_mech_put(gss_auth->mech);
672
673 kfree(gss_auth);
674 module_put(THIS_MODULE);
675}
676
677static void
678gss_free_callback(struct kref *kref)
679{
680 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
681
682 gss_free(gss_auth);
683}
684
685static void
686gss_destroy(struct rpc_auth *auth)
687{
688 struct gss_auth *gss_auth;
689
690 dprintk("RPC: destroying GSS authenticator %p flavor %d\n",
691 auth, auth->au_flavor);
692
693 rpcauth_destroy_credcache(auth);
694
695 gss_auth = container_of(auth, struct gss_auth, rpc_auth);
696 kref_put(&gss_auth->kref, gss_free_callback);
697}
698
699/*
700 * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
701 * to the server with the GSS control procedure field set to
702 * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
703 * all RPCSEC_GSS state associated with that context.
704 */
705static int
706gss_destroying_context(struct rpc_cred *cred)
707{
708 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
709 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
710 struct rpc_task *task;
711
712 if (gss_cred->gc_ctx == NULL ||
713 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
714 return 0;
715
716 gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
717 cred->cr_ops = &gss_nullops;
718
719 /* Take a reference to ensure the cred will be destroyed either
720 * by the RPC call or by the put_rpccred() below */
721 get_rpccred(cred);
722
723 task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
724 if (!IS_ERR(task))
725 rpc_put_task(task);
726
727 put_rpccred(cred);
728 return 1;
729}
730
731/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
732 * to create a new cred or context, so they check that things have been
733 * allocated before freeing them. */
734static void
735gss_do_free_ctx(struct gss_cl_ctx *ctx)
736{
737 dprintk("RPC: gss_free_ctx\n");
738
739 kfree(ctx->gc_wire_ctx.data);
740 kfree(ctx);
741}
742
743static void
744gss_free_ctx_callback(struct rcu_head *head)
745{
746 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
747 gss_do_free_ctx(ctx);
748}
749
750static void
751gss_free_ctx(struct gss_cl_ctx *ctx)
752{
753 struct gss_ctx *gc_gss_ctx;
754
755 gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx);
756 rcu_assign_pointer(ctx->gc_gss_ctx, NULL);
757 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
758 if (gc_gss_ctx)
759 gss_delete_sec_context(&gc_gss_ctx);
760}
761
762static void
763gss_free_cred(struct gss_cred *gss_cred)
764{
765 dprintk("RPC: gss_free_cred %p\n", gss_cred);
766 kfree(gss_cred);
767}
768
769static void
770gss_free_cred_callback(struct rcu_head *head)
771{
772 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
773 gss_free_cred(gss_cred);
774}
775
776static void
777gss_destroy_nullcred(struct rpc_cred *cred)
778{
779 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
780 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
781 struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
782
783 rcu_assign_pointer(gss_cred->gc_ctx, NULL);
784 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
785 if (ctx)
786 gss_put_ctx(ctx);
787 kref_put(&gss_auth->kref, gss_free_callback);
788}
789
790static void
791gss_destroy_cred(struct rpc_cred *cred)
792{
793
794 if (gss_destroying_context(cred))
795 return;
796 gss_destroy_nullcred(cred);
797}
798
799/*
800 * Lookup RPCSEC_GSS cred for the current process
801 */
802static struct rpc_cred *
803gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
804{
805 return rpcauth_lookup_credcache(auth, acred, flags);
806}
807
808static struct rpc_cred *
809gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
810{
811 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
812 struct gss_cred *cred = NULL;
813 int err = -ENOMEM;
814
815 dprintk("RPC: gss_create_cred for uid %d, flavor %d\n",
816 acred->uid, auth->au_flavor);
817
818 if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
819 goto out_err;
820
821 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
822 /*
823 * Note: in order to force a call to call_refresh(), we deliberately
824 * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
825 */
826 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
827 cred->gc_service = gss_auth->service;
828 cred->gc_machine_cred = acred->machine_cred;
829 kref_get(&gss_auth->kref);
830 return &cred->gc_base;
831
832out_err:
833 dprintk("RPC: gss_create_cred failed with error %d\n", err);
834 return ERR_PTR(err);
835}
836
837static int
838gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
839{
840 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
841 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
842 int err;
843
844 do {
845 err = gss_create_upcall(gss_auth, gss_cred);
846 } while (err == -EAGAIN);
847 return err;
848}
849
850static int
851gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
852{
853 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
854
855 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
856 goto out;
857 /* Don't match with creds that have expired. */
858 if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
859 return 0;
860 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
861 return 0;
862out:
863 if (acred->machine_cred != gss_cred->gc_machine_cred)
864 return 0;
865 return (rc->cr_uid == acred->uid);
866}
867
868/*
869* Marshal credentials.
870* Maybe we should keep a cached credential for performance reasons.
871*/
872static __be32 *
873gss_marshal(struct rpc_task *task, __be32 *p)
874{
875 struct rpc_cred *cred = task->tk_msg.rpc_cred;
876 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
877 gc_base);
878 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
879 __be32 *cred_len;
880 struct rpc_rqst *req = task->tk_rqstp;
881 u32 maj_stat = 0;
882 struct xdr_netobj mic;
883 struct kvec iov;
884 struct xdr_buf verf_buf;
885
886 dprintk("RPC: %5u gss_marshal\n", task->tk_pid);
887
888 *p++ = htonl(RPC_AUTH_GSS);
889 cred_len = p++;
890
891 spin_lock(&ctx->gc_seq_lock);
892 req->rq_seqno = ctx->gc_seq++;
893 spin_unlock(&ctx->gc_seq_lock);
894
895 *p++ = htonl((u32) RPC_GSS_VERSION);
896 *p++ = htonl((u32) ctx->gc_proc);
897 *p++ = htonl((u32) req->rq_seqno);
898 *p++ = htonl((u32) gss_cred->gc_service);
899 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
900 *cred_len = htonl((p - (cred_len + 1)) << 2);
901
902 /* We compute the checksum for the verifier over the xdr-encoded bytes
903 * starting with the xid and ending at the end of the credential: */
904 iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
905 req->rq_snd_buf.head[0].iov_base);
906 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
907 xdr_buf_from_iov(&iov, &verf_buf);
908
909 /* set verifier flavor*/
910 *p++ = htonl(RPC_AUTH_GSS);
911
912 mic.data = (u8 *)(p + 1);
913 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
914 if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
915 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
916 } else if (maj_stat != 0) {
917 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
918 goto out_put_ctx;
919 }
920 p = xdr_encode_opaque(p, NULL, mic.len);
921 gss_put_ctx(ctx);
922 return p;
923out_put_ctx:
924 gss_put_ctx(ctx);
925 return NULL;
926}
927
928static int gss_renew_cred(struct rpc_task *task)
929{
930 struct rpc_cred *oldcred = task->tk_msg.rpc_cred;
931 struct gss_cred *gss_cred = container_of(oldcred,
932 struct gss_cred,
933 gc_base);
934 struct rpc_auth *auth = oldcred->cr_auth;
935 struct auth_cred acred = {
936 .uid = oldcred->cr_uid,
937 .machine_cred = gss_cred->gc_machine_cred,
938 };
939 struct rpc_cred *new;
940
941 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
942 if (IS_ERR(new))
943 return PTR_ERR(new);
944 task->tk_msg.rpc_cred = new;
945 put_rpccred(oldcred);
946 return 0;
947}
948
949/*
950* Refresh credentials. XXX - finish
951*/
952static int
953gss_refresh(struct rpc_task *task)
954{
955 struct rpc_cred *cred = task->tk_msg.rpc_cred;
956 int ret = 0;
957
958 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
959 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
960 ret = gss_renew_cred(task);
961 if (ret < 0)
962 goto out;
963 cred = task->tk_msg.rpc_cred;
964 }
965
966 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
967 ret = gss_refresh_upcall(task);
968out:
969 return ret;
970}
971
972/* Dummy refresh routine: used only when destroying the context */
973static int
974gss_refresh_null(struct rpc_task *task)
975{
976 return -EACCES;
977}
978
979static __be32 *
980gss_validate(struct rpc_task *task, __be32 *p)
981{
982 struct rpc_cred *cred = task->tk_msg.rpc_cred;
983 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
984 __be32 seq;
985 struct kvec iov;
986 struct xdr_buf verf_buf;
987 struct xdr_netobj mic;
988 u32 flav,len;
989 u32 maj_stat;
990
991 dprintk("RPC: %5u gss_validate\n", task->tk_pid);
992
993 flav = ntohl(*p++);
994 if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
995 goto out_bad;
996 if (flav != RPC_AUTH_GSS)
997 goto out_bad;
998 seq = htonl(task->tk_rqstp->rq_seqno);
999 iov.iov_base = &seq;
1000 iov.iov_len = sizeof(seq);
1001 xdr_buf_from_iov(&iov, &verf_buf);
1002 mic.data = (u8 *)p;
1003 mic.len = len;
1004
1005 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1006 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1007 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1008 if (maj_stat) {
1009 dprintk("RPC: %5u gss_validate: gss_verify_mic returned "
1010 "error 0x%08x\n", task->tk_pid, maj_stat);
1011 goto out_bad;
1012 }
1013 /* We leave it to unwrap to calculate au_rslack. For now we just
1014 * calculate the length of the verifier: */
1015 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1016 gss_put_ctx(ctx);
1017 dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n",
1018 task->tk_pid);
1019 return p + XDR_QUADLEN(len);
1020out_bad:
1021 gss_put_ctx(ctx);
1022 dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid);
1023 return NULL;
1024}
1025
1026static inline int
1027gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1028 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
1029{
1030 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1031 struct xdr_buf integ_buf;
1032 __be32 *integ_len = NULL;
1033 struct xdr_netobj mic;
1034 u32 offset;
1035 __be32 *q;
1036 struct kvec *iov;
1037 u32 maj_stat = 0;
1038 int status = -EIO;
1039
1040 integ_len = p++;
1041 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1042 *p++ = htonl(rqstp->rq_seqno);
1043
1044 status = encode(rqstp, p, obj);
1045 if (status)
1046 return status;
1047
1048 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1049 offset, snd_buf->len - offset))
1050 return status;
1051 *integ_len = htonl(integ_buf.len);
1052
1053 /* guess whether we're in the head or the tail: */
1054 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1055 iov = snd_buf->tail;
1056 else
1057 iov = snd_buf->head;
1058 p = iov->iov_base + iov->iov_len;
1059 mic.data = (u8 *)(p + 1);
1060
1061 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1062 status = -EIO; /* XXX? */
1063 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1064 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1065 else if (maj_stat)
1066 return status;
1067 q = xdr_encode_opaque(p, NULL, mic.len);
1068
1069 offset = (u8 *)q - (u8 *)p;
1070 iov->iov_len += offset;
1071 snd_buf->len += offset;
1072 return 0;
1073}
1074
1075static void
1076priv_release_snd_buf(struct rpc_rqst *rqstp)
1077{
1078 int i;
1079
1080 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1081 __free_page(rqstp->rq_enc_pages[i]);
1082 kfree(rqstp->rq_enc_pages);
1083}
1084
1085static int
1086alloc_enc_pages(struct rpc_rqst *rqstp)
1087{
1088 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1089 int first, last, i;
1090
1091 if (snd_buf->page_len == 0) {
1092 rqstp->rq_enc_pages_num = 0;
1093 return 0;
1094 }
1095
1096 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1097 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1098 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1099 rqstp->rq_enc_pages
1100 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1101 GFP_NOFS);
1102 if (!rqstp->rq_enc_pages)
1103 goto out;
1104 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1105 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1106 if (rqstp->rq_enc_pages[i] == NULL)
1107 goto out_free;
1108 }
1109 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1110 return 0;
1111out_free:
1112 for (i--; i >= 0; i--) {
1113 __free_page(rqstp->rq_enc_pages[i]);
1114 }
1115out:
1116 return -EAGAIN;
1117}
1118
1119static inline int
1120gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1121 kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj)
1122{
1123 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1124 u32 offset;
1125 u32 maj_stat;
1126 int status;
1127 __be32 *opaque_len;
1128 struct page **inpages;
1129 int first;
1130 int pad;
1131 struct kvec *iov;
1132 char *tmp;
1133
1134 opaque_len = p++;
1135 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1136 *p++ = htonl(rqstp->rq_seqno);
1137
1138 status = encode(rqstp, p, obj);
1139 if (status)
1140 return status;
1141
1142 status = alloc_enc_pages(rqstp);
1143 if (status)
1144 return status;
1145 first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1146 inpages = snd_buf->pages + first;
1147 snd_buf->pages = rqstp->rq_enc_pages;
1148 snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1149 /* Give the tail its own page, in case we need extra space in the
1150 * head when wrapping: */
1151 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1152 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1153 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1154 snd_buf->tail[0].iov_base = tmp;
1155 }
1156 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1157 /* RPC_SLACK_SPACE should prevent this ever happening: */
1158 BUG_ON(snd_buf->len > snd_buf->buflen);
1159 status = -EIO;
1160 /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1161 * done anyway, so it's safe to put the request on the wire: */
1162 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1163 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1164 else if (maj_stat)
1165 return status;
1166
1167 *opaque_len = htonl(snd_buf->len - offset);
1168 /* guess whether we're in the head or the tail: */
1169 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1170 iov = snd_buf->tail;
1171 else
1172 iov = snd_buf->head;
1173 p = iov->iov_base + iov->iov_len;
1174 pad = 3 - ((snd_buf->len - offset - 1) & 3);
1175 memset(p, 0, pad);
1176 iov->iov_len += pad;
1177 snd_buf->len += pad;
1178
1179 return 0;
1180}
1181
1182static int
1183gss_wrap_req(struct rpc_task *task,
1184 kxdrproc_t encode, void *rqstp, __be32 *p, void *obj)
1185{
1186 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1187 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1188 gc_base);
1189 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1190 int status = -EIO;
1191
1192 dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid);
1193 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1194 /* The spec seems a little ambiguous here, but I think that not
1195 * wrapping context destruction requests makes the most sense.
1196 */
1197 status = encode(rqstp, p, obj);
1198 goto out;
1199 }
1200 switch (gss_cred->gc_service) {
1201 case RPC_GSS_SVC_NONE:
1202 status = encode(rqstp, p, obj);
1203 break;
1204 case RPC_GSS_SVC_INTEGRITY:
1205 status = gss_wrap_req_integ(cred, ctx, encode,
1206 rqstp, p, obj);
1207 break;
1208 case RPC_GSS_SVC_PRIVACY:
1209 status = gss_wrap_req_priv(cred, ctx, encode,
1210 rqstp, p, obj);
1211 break;
1212 }
1213out:
1214 gss_put_ctx(ctx);
1215 dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status);
1216 return status;
1217}
1218
1219static inline int
1220gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1221 struct rpc_rqst *rqstp, __be32 **p)
1222{
1223 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1224 struct xdr_buf integ_buf;
1225 struct xdr_netobj mic;
1226 u32 data_offset, mic_offset;
1227 u32 integ_len;
1228 u32 maj_stat;
1229 int status = -EIO;
1230
1231 integ_len = ntohl(*(*p)++);
1232 if (integ_len & 3)
1233 return status;
1234 data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1235 mic_offset = integ_len + data_offset;
1236 if (mic_offset > rcv_buf->len)
1237 return status;
1238 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1239 return status;
1240
1241 if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1242 mic_offset - data_offset))
1243 return status;
1244
1245 if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1246 return status;
1247
1248 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1249 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1250 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1251 if (maj_stat != GSS_S_COMPLETE)
1252 return status;
1253 return 0;
1254}
1255
1256static inline int
1257gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1258 struct rpc_rqst *rqstp, __be32 **p)
1259{
1260 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
1261 u32 offset;
1262 u32 opaque_len;
1263 u32 maj_stat;
1264 int status = -EIO;
1265
1266 opaque_len = ntohl(*(*p)++);
1267 offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1268 if (offset + opaque_len > rcv_buf->len)
1269 return status;
1270 /* remove padding: */
1271 rcv_buf->len = offset + opaque_len;
1272
1273 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1274 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1275 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1276 if (maj_stat != GSS_S_COMPLETE)
1277 return status;
1278 if (ntohl(*(*p)++) != rqstp->rq_seqno)
1279 return status;
1280
1281 return 0;
1282}
1283
1284
1285static int
1286gss_unwrap_resp(struct rpc_task *task,
1287 kxdrproc_t decode, void *rqstp, __be32 *p, void *obj)
1288{
1289 struct rpc_cred *cred = task->tk_msg.rpc_cred;
1290 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1291 gc_base);
1292 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1293 __be32 *savedp = p;
1294 struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1295 int savedlen = head->iov_len;
1296 int status = -EIO;
1297
1298 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1299 goto out_decode;
1300 switch (gss_cred->gc_service) {
1301 case RPC_GSS_SVC_NONE:
1302 break;
1303 case RPC_GSS_SVC_INTEGRITY:
1304 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1305 if (status)
1306 goto out;
1307 break;
1308 case RPC_GSS_SVC_PRIVACY:
1309 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1310 if (status)
1311 goto out;
1312 break;
1313 }
1314 /* take into account extra slack for integrity and privacy cases: */
1315 cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1316 + (savedlen - head->iov_len);
1317out_decode:
1318 status = decode(rqstp, p, obj);
1319out:
1320 gss_put_ctx(ctx);
1321 dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid,
1322 status);
1323 return status;
1324}
1325
1326static const struct rpc_authops authgss_ops = {
1327 .owner = THIS_MODULE,
1328 .au_flavor = RPC_AUTH_GSS,
1329 .au_name = "RPCSEC_GSS",
1330 .create = gss_create,
1331 .destroy = gss_destroy,
1332 .lookup_cred = gss_lookup_cred,
1333 .crcreate = gss_create_cred
1334};
1335
1336static const struct rpc_credops gss_credops = {
1337 .cr_name = "AUTH_GSS",
1338 .crdestroy = gss_destroy_cred,
1339 .cr_init = gss_cred_init,
1340 .crbind = rpcauth_generic_bind_cred,
1341 .crmatch = gss_match,
1342 .crmarshal = gss_marshal,
1343 .crrefresh = gss_refresh,
1344 .crvalidate = gss_validate,
1345 .crwrap_req = gss_wrap_req,
1346 .crunwrap_resp = gss_unwrap_resp,
1347};
1348
1349static const struct rpc_credops gss_nullops = {
1350 .cr_name = "AUTH_GSS",
1351 .crdestroy = gss_destroy_nullcred,
1352 .crbind = rpcauth_generic_bind_cred,
1353 .crmatch = gss_match,
1354 .crmarshal = gss_marshal,
1355 .crrefresh = gss_refresh_null,
1356 .crvalidate = gss_validate,
1357 .crwrap_req = gss_wrap_req,
1358 .crunwrap_resp = gss_unwrap_resp,
1359};
1360
1361static struct rpc_pipe_ops gss_upcall_ops = {
1362 .upcall = gss_pipe_upcall,
1363 .downcall = gss_pipe_downcall,
1364 .destroy_msg = gss_pipe_destroy_msg,
1365 .open_pipe = gss_pipe_open,
1366 .release_pipe = gss_pipe_release,
1367};
1368
1369/*
1370 * Initialize RPCSEC_GSS module
1371 */
1372static int __init init_rpcsec_gss(void)
1373{
1374 int err = 0;
1375
1376 err = rpcauth_register(&authgss_ops);
1377 if (err)
1378 goto out;
1379 err = gss_svc_init();
1380 if (err)
1381 goto out_unregister;
1382 return 0;
1383out_unregister:
1384 rpcauth_unregister(&authgss_ops);
1385out:
1386 return err;
1387}
1388
1389static void __exit exit_rpcsec_gss(void)
1390{
1391 gss_svc_shutdown();
1392 rpcauth_unregister(&authgss_ops);
1393}
1394
1395MODULE_LICENSE("GPL");
1396module_init(init_rpcsec_gss)
1397module_exit(exit_rpcsec_gss)
Linux 6.x block layer and io_uring tree(s)