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Linux/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 #include <linux/hashtable.h>
 55 
 56 #include "../netns.h"
 57 
 58 static const struct rpc_authops authgss_ops;
 59 
 60 static const struct rpc_credops gss_credops;
 61 static const struct rpc_credops gss_nullops;
 62 
 63 #define GSS_RETRY_EXPIRED 5
 64 static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
 65 
 66 #define GSS_KEY_EXPIRE_TIMEO 240
 67 static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
 68 
 69 #ifdef RPC_DEBUG
 70 # define RPCDBG_FACILITY        RPCDBG_AUTH
 71 #endif
 72 
 73 #define GSS_CRED_SLACK          (RPC_MAX_AUTH_SIZE * 2)
 74 /* length of a krb5 verifier (48), plus data added before arguments when
 75  * using integrity (two 4-byte integers): */
 76 #define GSS_VERF_SLACK          100
 77 
 78 static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
 79 static DEFINE_SPINLOCK(gss_auth_hash_lock);
 80 
 81 struct gss_pipe {
 82         struct rpc_pipe_dir_object pdo;
 83         struct rpc_pipe *pipe;
 84         struct rpc_clnt *clnt;
 85         const char *name;
 86         struct kref kref;
 87 };
 88 
 89 struct gss_auth {
 90         struct kref kref;
 91         struct hlist_node hash;
 92         struct rpc_auth rpc_auth;
 93         struct gss_api_mech *mech;
 94         enum rpc_gss_svc service;
 95         struct rpc_clnt *client;
 96         struct net *net;
 97         /*
 98          * There are two upcall pipes; dentry[1], named "gssd", is used
 99          * for the new text-based upcall; dentry[0] is named after the
100          * mechanism (for example, "krb5") and exists for
101          * backwards-compatibility with older gssd's.
102          */
103         struct gss_pipe *gss_pipe[2];
104         const char *target_name;
105 };
106 
107 /* pipe_version >= 0 if and only if someone has a pipe open. */
108 static DEFINE_SPINLOCK(pipe_version_lock);
109 static struct rpc_wait_queue pipe_version_rpc_waitqueue;
110 static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
111 static void gss_put_auth(struct gss_auth *gss_auth);
112 
113 static void gss_free_ctx(struct gss_cl_ctx *);
114 static const struct rpc_pipe_ops gss_upcall_ops_v0;
115 static const struct rpc_pipe_ops gss_upcall_ops_v1;
116 
117 static inline struct gss_cl_ctx *
118 gss_get_ctx(struct gss_cl_ctx *ctx)
119 {
120         atomic_inc(&ctx->count);
121         return ctx;
122 }
123 
124 static inline void
125 gss_put_ctx(struct gss_cl_ctx *ctx)
126 {
127         if (atomic_dec_and_test(&ctx->count))
128                 gss_free_ctx(ctx);
129 }
130 
131 /* gss_cred_set_ctx:
132  * called by gss_upcall_callback and gss_create_upcall in order
133  * to set the gss context. The actual exchange of an old context
134  * and a new one is protected by the pipe->lock.
135  */
136 static void
137 gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
138 {
139         struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
140 
141         if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
142                 return;
143         gss_get_ctx(ctx);
144         rcu_assign_pointer(gss_cred->gc_ctx, ctx);
145         set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
146         smp_mb__before_atomic();
147         clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
148 }
149 
150 static const void *
151 simple_get_bytes(const void *p, const void *end, void *res, size_t len)
152 {
153         const void *q = (const void *)((const char *)p + len);
154         if (unlikely(q > end || q < p))
155                 return ERR_PTR(-EFAULT);
156         memcpy(res, p, len);
157         return q;
158 }
159 
160 static inline const void *
161 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
162 {
163         const void *q;
164         unsigned int len;
165 
166         p = simple_get_bytes(p, end, &len, sizeof(len));
167         if (IS_ERR(p))
168                 return p;
169         q = (const void *)((const char *)p + len);
170         if (unlikely(q > end || q < p))
171                 return ERR_PTR(-EFAULT);
172         dest->data = kmemdup(p, len, GFP_NOFS);
173         if (unlikely(dest->data == NULL))
174                 return ERR_PTR(-ENOMEM);
175         dest->len = len;
176         return q;
177 }
178 
179 static struct gss_cl_ctx *
180 gss_cred_get_ctx(struct rpc_cred *cred)
181 {
182         struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
183         struct gss_cl_ctx *ctx = NULL;
184 
185         rcu_read_lock();
186         ctx = rcu_dereference(gss_cred->gc_ctx);
187         if (ctx)
188                 gss_get_ctx(ctx);
189         rcu_read_unlock();
190         return ctx;
191 }
192 
193 static struct gss_cl_ctx *
194 gss_alloc_context(void)
195 {
196         struct gss_cl_ctx *ctx;
197 
198         ctx = kzalloc(sizeof(*ctx), GFP_NOFS);
199         if (ctx != NULL) {
200                 ctx->gc_proc = RPC_GSS_PROC_DATA;
201                 ctx->gc_seq = 1;        /* NetApp 6.4R1 doesn't accept seq. no. 0 */
202                 spin_lock_init(&ctx->gc_seq_lock);
203                 atomic_set(&ctx->count,1);
204         }
205         return ctx;
206 }
207 
208 #define GSSD_MIN_TIMEOUT (60 * 60)
209 static const void *
210 gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
211 {
212         const void *q;
213         unsigned int seclen;
214         unsigned int timeout;
215         unsigned long now = jiffies;
216         u32 window_size;
217         int ret;
218 
219         /* First unsigned int gives the remaining lifetime in seconds of the
220          * credential - e.g. the remaining TGT lifetime for Kerberos or
221          * the -t value passed to GSSD.
222          */
223         p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
224         if (IS_ERR(p))
225                 goto err;
226         if (timeout == 0)
227                 timeout = GSSD_MIN_TIMEOUT;
228         ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
229         /* Sequence number window. Determines the maximum number of
230          * simultaneous requests
231          */
232         p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
233         if (IS_ERR(p))
234                 goto err;
235         ctx->gc_win = window_size;
236         /* gssd signals an error by passing ctx->gc_win = 0: */
237         if (ctx->gc_win == 0) {
238                 /*
239                  * in which case, p points to an error code. Anything other
240                  * than -EKEYEXPIRED gets converted to -EACCES.
241                  */
242                 p = simple_get_bytes(p, end, &ret, sizeof(ret));
243                 if (!IS_ERR(p))
244                         p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
245                                                     ERR_PTR(-EACCES);
246                 goto err;
247         }
248         /* copy the opaque wire context */
249         p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
250         if (IS_ERR(p))
251                 goto err;
252         /* import the opaque security context */
253         p  = simple_get_bytes(p, end, &seclen, sizeof(seclen));
254         if (IS_ERR(p))
255                 goto err;
256         q = (const void *)((const char *)p + seclen);
257         if (unlikely(q > end || q < p)) {
258                 p = ERR_PTR(-EFAULT);
259                 goto err;
260         }
261         ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS);
262         if (ret < 0) {
263                 p = ERR_PTR(ret);
264                 goto err;
265         }
266 
267         /* is there any trailing data? */
268         if (q == end) {
269                 p = q;
270                 goto done;
271         }
272 
273         /* pull in acceptor name (if there is one) */
274         p = simple_get_netobj(q, end, &ctx->gc_acceptor);
275         if (IS_ERR(p))
276                 goto err;
277 done:
278         dprintk("RPC:       %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n",
279                 __func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len,
280                 ctx->gc_acceptor.data);
281         return p;
282 err:
283         dprintk("RPC:       %s returns error %ld\n", __func__, -PTR_ERR(p));
284         return p;
285 }
286 
287 #define UPCALL_BUF_LEN 128
288 
289 struct gss_upcall_msg {
290         atomic_t count;
291         kuid_t  uid;
292         struct rpc_pipe_msg msg;
293         struct list_head list;
294         struct gss_auth *auth;
295         struct rpc_pipe *pipe;
296         struct rpc_wait_queue rpc_waitqueue;
297         wait_queue_head_t waitqueue;
298         struct gss_cl_ctx *ctx;
299         char databuf[UPCALL_BUF_LEN];
300 };
301 
302 static int get_pipe_version(struct net *net)
303 {
304         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
305         int ret;
306 
307         spin_lock(&pipe_version_lock);
308         if (sn->pipe_version >= 0) {
309                 atomic_inc(&sn->pipe_users);
310                 ret = sn->pipe_version;
311         } else
312                 ret = -EAGAIN;
313         spin_unlock(&pipe_version_lock);
314         return ret;
315 }
316 
317 static void put_pipe_version(struct net *net)
318 {
319         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
320 
321         if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
322                 sn->pipe_version = -1;
323                 spin_unlock(&pipe_version_lock);
324         }
325 }
326 
327 static void
328 gss_release_msg(struct gss_upcall_msg *gss_msg)
329 {
330         struct net *net = gss_msg->auth->net;
331         if (!atomic_dec_and_test(&gss_msg->count))
332                 return;
333         put_pipe_version(net);
334         BUG_ON(!list_empty(&gss_msg->list));
335         if (gss_msg->ctx != NULL)
336                 gss_put_ctx(gss_msg->ctx);
337         rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
338         gss_put_auth(gss_msg->auth);
339         kfree(gss_msg);
340 }
341 
342 static struct gss_upcall_msg *
343 __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid)
344 {
345         struct gss_upcall_msg *pos;
346         list_for_each_entry(pos, &pipe->in_downcall, list) {
347                 if (!uid_eq(pos->uid, uid))
348                         continue;
349                 atomic_inc(&pos->count);
350                 dprintk("RPC:       %s found msg %p\n", __func__, pos);
351                 return pos;
352         }
353         dprintk("RPC:       %s found nothing\n", __func__);
354         return NULL;
355 }
356 
357 /* Try to add an upcall to the pipefs queue.
358  * If an upcall owned by our uid already exists, then we return a reference
359  * to that upcall instead of adding the new upcall.
360  */
361 static inline struct gss_upcall_msg *
362 gss_add_msg(struct gss_upcall_msg *gss_msg)
363 {
364         struct rpc_pipe *pipe = gss_msg->pipe;
365         struct gss_upcall_msg *old;
366 
367         spin_lock(&pipe->lock);
368         old = __gss_find_upcall(pipe, gss_msg->uid);
369         if (old == NULL) {
370                 atomic_inc(&gss_msg->count);
371                 list_add(&gss_msg->list, &pipe->in_downcall);
372         } else
373                 gss_msg = old;
374         spin_unlock(&pipe->lock);
375         return gss_msg;
376 }
377 
378 static void
379 __gss_unhash_msg(struct gss_upcall_msg *gss_msg)
380 {
381         list_del_init(&gss_msg->list);
382         rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
383         wake_up_all(&gss_msg->waitqueue);
384         atomic_dec(&gss_msg->count);
385 }
386 
387 static void
388 gss_unhash_msg(struct gss_upcall_msg *gss_msg)
389 {
390         struct rpc_pipe *pipe = gss_msg->pipe;
391 
392         if (list_empty(&gss_msg->list))
393                 return;
394         spin_lock(&pipe->lock);
395         if (!list_empty(&gss_msg->list))
396                 __gss_unhash_msg(gss_msg);
397         spin_unlock(&pipe->lock);
398 }
399 
400 static void
401 gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
402 {
403         switch (gss_msg->msg.errno) {
404         case 0:
405                 if (gss_msg->ctx == NULL)
406                         break;
407                 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
408                 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
409                 break;
410         case -EKEYEXPIRED:
411                 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
412         }
413         gss_cred->gc_upcall_timestamp = jiffies;
414         gss_cred->gc_upcall = NULL;
415         rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
416 }
417 
418 static void
419 gss_upcall_callback(struct rpc_task *task)
420 {
421         struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
422                         struct gss_cred, gc_base);
423         struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
424         struct rpc_pipe *pipe = gss_msg->pipe;
425 
426         spin_lock(&pipe->lock);
427         gss_handle_downcall_result(gss_cred, gss_msg);
428         spin_unlock(&pipe->lock);
429         task->tk_status = gss_msg->msg.errno;
430         gss_release_msg(gss_msg);
431 }
432 
433 static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg)
434 {
435         uid_t uid = from_kuid(&init_user_ns, gss_msg->uid);
436         memcpy(gss_msg->databuf, &uid, sizeof(uid));
437         gss_msg->msg.data = gss_msg->databuf;
438         gss_msg->msg.len = sizeof(uid);
439 
440         BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
441 }
442 
443 static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
444                                 const char *service_name,
445                                 const char *target_name)
446 {
447         struct gss_api_mech *mech = gss_msg->auth->mech;
448         char *p = gss_msg->databuf;
449         size_t buflen = sizeof(gss_msg->databuf);
450         int len;
451 
452         len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name,
453                         from_kuid(&init_user_ns, gss_msg->uid));
454         buflen -= len;
455         p += len;
456         gss_msg->msg.len = len;
457         if (target_name) {
458                 len = scnprintf(p, buflen, "target=%s ", target_name);
459                 buflen -= len;
460                 p += len;
461                 gss_msg->msg.len += len;
462         }
463         if (service_name != NULL) {
464                 len = scnprintf(p, buflen, "service=%s ", service_name);
465                 buflen -= len;
466                 p += len;
467                 gss_msg->msg.len += len;
468         }
469         if (mech->gm_upcall_enctypes) {
470                 len = scnprintf(p, buflen, "enctypes=%s ",
471                                 mech->gm_upcall_enctypes);
472                 buflen -= len;
473                 p += len;
474                 gss_msg->msg.len += len;
475         }
476         len = scnprintf(p, buflen, "\n");
477         if (len == 0)
478                 goto out_overflow;
479         gss_msg->msg.len += len;
480 
481         gss_msg->msg.data = gss_msg->databuf;
482         return 0;
483 out_overflow:
484         WARN_ON_ONCE(1);
485         return -ENOMEM;
486 }
487 
488 static struct gss_upcall_msg *
489 gss_alloc_msg(struct gss_auth *gss_auth,
490                 kuid_t uid, const char *service_name)
491 {
492         struct gss_upcall_msg *gss_msg;
493         int vers;
494         int err = -ENOMEM;
495 
496         gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
497         if (gss_msg == NULL)
498                 goto err;
499         vers = get_pipe_version(gss_auth->net);
500         err = vers;
501         if (err < 0)
502                 goto err_free_msg;
503         gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
504         INIT_LIST_HEAD(&gss_msg->list);
505         rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
506         init_waitqueue_head(&gss_msg->waitqueue);
507         atomic_set(&gss_msg->count, 1);
508         gss_msg->uid = uid;
509         gss_msg->auth = gss_auth;
510         switch (vers) {
511         case 0:
512                 gss_encode_v0_msg(gss_msg);
513                 break;
514         default:
515                 err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name);
516                 if (err)
517                         goto err_put_pipe_version;
518         };
519         kref_get(&gss_auth->kref);
520         return gss_msg;
521 err_put_pipe_version:
522         put_pipe_version(gss_auth->net);
523 err_free_msg:
524         kfree(gss_msg);
525 err:
526         return ERR_PTR(err);
527 }
528 
529 static struct gss_upcall_msg *
530 gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
531 {
532         struct gss_cred *gss_cred = container_of(cred,
533                         struct gss_cred, gc_base);
534         struct gss_upcall_msg *gss_new, *gss_msg;
535         kuid_t uid = cred->cr_uid;
536 
537         gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
538         if (IS_ERR(gss_new))
539                 return gss_new;
540         gss_msg = gss_add_msg(gss_new);
541         if (gss_msg == gss_new) {
542                 int res;
543                 atomic_inc(&gss_msg->count);
544                 res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
545                 if (res) {
546                         gss_unhash_msg(gss_new);
547                         atomic_dec(&gss_msg->count);
548                         gss_release_msg(gss_new);
549                         gss_msg = ERR_PTR(res);
550                 }
551         } else
552                 gss_release_msg(gss_new);
553         return gss_msg;
554 }
555 
556 static void warn_gssd(void)
557 {
558         dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
559 }
560 
561 static inline int
562 gss_refresh_upcall(struct rpc_task *task)
563 {
564         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
565         struct gss_auth *gss_auth = container_of(cred->cr_auth,
566                         struct gss_auth, rpc_auth);
567         struct gss_cred *gss_cred = container_of(cred,
568                         struct gss_cred, gc_base);
569         struct gss_upcall_msg *gss_msg;
570         struct rpc_pipe *pipe;
571         int err = 0;
572 
573         dprintk("RPC: %5u %s for uid %u\n",
574                 task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid));
575         gss_msg = gss_setup_upcall(gss_auth, cred);
576         if (PTR_ERR(gss_msg) == -EAGAIN) {
577                 /* XXX: warning on the first, under the assumption we
578                  * shouldn't normally hit this case on a refresh. */
579                 warn_gssd();
580                 task->tk_timeout = 15*HZ;
581                 rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL);
582                 return -EAGAIN;
583         }
584         if (IS_ERR(gss_msg)) {
585                 err = PTR_ERR(gss_msg);
586                 goto out;
587         }
588         pipe = gss_msg->pipe;
589         spin_lock(&pipe->lock);
590         if (gss_cred->gc_upcall != NULL)
591                 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
592         else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
593                 task->tk_timeout = 0;
594                 gss_cred->gc_upcall = gss_msg;
595                 /* gss_upcall_callback will release the reference to gss_upcall_msg */
596                 atomic_inc(&gss_msg->count);
597                 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
598         } else {
599                 gss_handle_downcall_result(gss_cred, gss_msg);
600                 err = gss_msg->msg.errno;
601         }
602         spin_unlock(&pipe->lock);
603         gss_release_msg(gss_msg);
604 out:
605         dprintk("RPC: %5u %s for uid %u result %d\n",
606                 task->tk_pid, __func__,
607                 from_kuid(&init_user_ns, cred->cr_uid), err);
608         return err;
609 }
610 
611 static inline int
612 gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
613 {
614         struct net *net = gss_auth->net;
615         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
616         struct rpc_pipe *pipe;
617         struct rpc_cred *cred = &gss_cred->gc_base;
618         struct gss_upcall_msg *gss_msg;
619         DEFINE_WAIT(wait);
620         int err;
621 
622         dprintk("RPC:       %s for uid %u\n",
623                 __func__, from_kuid(&init_user_ns, cred->cr_uid));
624 retry:
625         err = 0;
626         /* if gssd is down, just skip upcalling altogether */
627         if (!gssd_running(net)) {
628                 warn_gssd();
629                 return -EACCES;
630         }
631         gss_msg = gss_setup_upcall(gss_auth, cred);
632         if (PTR_ERR(gss_msg) == -EAGAIN) {
633                 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
634                                 sn->pipe_version >= 0, 15 * HZ);
635                 if (sn->pipe_version < 0) {
636                         warn_gssd();
637                         err = -EACCES;
638                 }
639                 if (err < 0)
640                         goto out;
641                 goto retry;
642         }
643         if (IS_ERR(gss_msg)) {
644                 err = PTR_ERR(gss_msg);
645                 goto out;
646         }
647         pipe = gss_msg->pipe;
648         for (;;) {
649                 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
650                 spin_lock(&pipe->lock);
651                 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
652                         break;
653                 }
654                 spin_unlock(&pipe->lock);
655                 if (fatal_signal_pending(current)) {
656                         err = -ERESTARTSYS;
657                         goto out_intr;
658                 }
659                 schedule();
660         }
661         if (gss_msg->ctx)
662                 gss_cred_set_ctx(cred, gss_msg->ctx);
663         else
664                 err = gss_msg->msg.errno;
665         spin_unlock(&pipe->lock);
666 out_intr:
667         finish_wait(&gss_msg->waitqueue, &wait);
668         gss_release_msg(gss_msg);
669 out:
670         dprintk("RPC:       %s for uid %u result %d\n",
671                 __func__, from_kuid(&init_user_ns, cred->cr_uid), err);
672         return err;
673 }
674 
675 #define MSG_BUF_MAXSIZE 1024
676 
677 static ssize_t
678 gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
679 {
680         const void *p, *end;
681         void *buf;
682         struct gss_upcall_msg *gss_msg;
683         struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
684         struct gss_cl_ctx *ctx;
685         uid_t id;
686         kuid_t uid;
687         ssize_t err = -EFBIG;
688 
689         if (mlen > MSG_BUF_MAXSIZE)
690                 goto out;
691         err = -ENOMEM;
692         buf = kmalloc(mlen, GFP_NOFS);
693         if (!buf)
694                 goto out;
695 
696         err = -EFAULT;
697         if (copy_from_user(buf, src, mlen))
698                 goto err;
699 
700         end = (const void *)((char *)buf + mlen);
701         p = simple_get_bytes(buf, end, &id, sizeof(id));
702         if (IS_ERR(p)) {
703                 err = PTR_ERR(p);
704                 goto err;
705         }
706 
707         uid = make_kuid(&init_user_ns, id);
708         if (!uid_valid(uid)) {
709                 err = -EINVAL;
710                 goto err;
711         }
712 
713         err = -ENOMEM;
714         ctx = gss_alloc_context();
715         if (ctx == NULL)
716                 goto err;
717 
718         err = -ENOENT;
719         /* Find a matching upcall */
720         spin_lock(&pipe->lock);
721         gss_msg = __gss_find_upcall(pipe, uid);
722         if (gss_msg == NULL) {
723                 spin_unlock(&pipe->lock);
724                 goto err_put_ctx;
725         }
726         list_del_init(&gss_msg->list);
727         spin_unlock(&pipe->lock);
728 
729         p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
730         if (IS_ERR(p)) {
731                 err = PTR_ERR(p);
732                 switch (err) {
733                 case -EACCES:
734                 case -EKEYEXPIRED:
735                         gss_msg->msg.errno = err;
736                         err = mlen;
737                         break;
738                 case -EFAULT:
739                 case -ENOMEM:
740                 case -EINVAL:
741                 case -ENOSYS:
742                         gss_msg->msg.errno = -EAGAIN;
743                         break;
744                 default:
745                         printk(KERN_CRIT "%s: bad return from "
746                                 "gss_fill_context: %zd\n", __func__, err);
747                         BUG();
748                 }
749                 goto err_release_msg;
750         }
751         gss_msg->ctx = gss_get_ctx(ctx);
752         err = mlen;
753 
754 err_release_msg:
755         spin_lock(&pipe->lock);
756         __gss_unhash_msg(gss_msg);
757         spin_unlock(&pipe->lock);
758         gss_release_msg(gss_msg);
759 err_put_ctx:
760         gss_put_ctx(ctx);
761 err:
762         kfree(buf);
763 out:
764         dprintk("RPC:       %s returning %Zd\n", __func__, err);
765         return err;
766 }
767 
768 static int gss_pipe_open(struct inode *inode, int new_version)
769 {
770         struct net *net = inode->i_sb->s_fs_info;
771         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
772         int ret = 0;
773 
774         spin_lock(&pipe_version_lock);
775         if (sn->pipe_version < 0) {
776                 /* First open of any gss pipe determines the version: */
777                 sn->pipe_version = new_version;
778                 rpc_wake_up(&pipe_version_rpc_waitqueue);
779                 wake_up(&pipe_version_waitqueue);
780         } else if (sn->pipe_version != new_version) {
781                 /* Trying to open a pipe of a different version */
782                 ret = -EBUSY;
783                 goto out;
784         }
785         atomic_inc(&sn->pipe_users);
786 out:
787         spin_unlock(&pipe_version_lock);
788         return ret;
789 
790 }
791 
792 static int gss_pipe_open_v0(struct inode *inode)
793 {
794         return gss_pipe_open(inode, 0);
795 }
796 
797 static int gss_pipe_open_v1(struct inode *inode)
798 {
799         return gss_pipe_open(inode, 1);
800 }
801 
802 static void
803 gss_pipe_release(struct inode *inode)
804 {
805         struct net *net = inode->i_sb->s_fs_info;
806         struct rpc_pipe *pipe = RPC_I(inode)->pipe;
807         struct gss_upcall_msg *gss_msg;
808 
809 restart:
810         spin_lock(&pipe->lock);
811         list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
812 
813                 if (!list_empty(&gss_msg->msg.list))
814                         continue;
815                 gss_msg->msg.errno = -EPIPE;
816                 atomic_inc(&gss_msg->count);
817                 __gss_unhash_msg(gss_msg);
818                 spin_unlock(&pipe->lock);
819                 gss_release_msg(gss_msg);
820                 goto restart;
821         }
822         spin_unlock(&pipe->lock);
823 
824         put_pipe_version(net);
825 }
826 
827 static void
828 gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
829 {
830         struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
831 
832         if (msg->errno < 0) {
833                 dprintk("RPC:       %s releasing msg %p\n",
834                         __func__, gss_msg);
835                 atomic_inc(&gss_msg->count);
836                 gss_unhash_msg(gss_msg);
837                 if (msg->errno == -ETIMEDOUT)
838                         warn_gssd();
839                 gss_release_msg(gss_msg);
840         }
841         gss_release_msg(gss_msg);
842 }
843 
844 static void gss_pipe_dentry_destroy(struct dentry *dir,
845                 struct rpc_pipe_dir_object *pdo)
846 {
847         struct gss_pipe *gss_pipe = pdo->pdo_data;
848         struct rpc_pipe *pipe = gss_pipe->pipe;
849 
850         if (pipe->dentry != NULL) {
851                 rpc_unlink(pipe->dentry);
852                 pipe->dentry = NULL;
853         }
854 }
855 
856 static int gss_pipe_dentry_create(struct dentry *dir,
857                 struct rpc_pipe_dir_object *pdo)
858 {
859         struct gss_pipe *p = pdo->pdo_data;
860         struct dentry *dentry;
861 
862         dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
863         if (IS_ERR(dentry))
864                 return PTR_ERR(dentry);
865         p->pipe->dentry = dentry;
866         return 0;
867 }
868 
869 static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
870         .create = gss_pipe_dentry_create,
871         .destroy = gss_pipe_dentry_destroy,
872 };
873 
874 static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
875                 const char *name,
876                 const struct rpc_pipe_ops *upcall_ops)
877 {
878         struct gss_pipe *p;
879         int err = -ENOMEM;
880 
881         p = kmalloc(sizeof(*p), GFP_KERNEL);
882         if (p == NULL)
883                 goto err;
884         p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
885         if (IS_ERR(p->pipe)) {
886                 err = PTR_ERR(p->pipe);
887                 goto err_free_gss_pipe;
888         }
889         p->name = name;
890         p->clnt = clnt;
891         kref_init(&p->kref);
892         rpc_init_pipe_dir_object(&p->pdo,
893                         &gss_pipe_dir_object_ops,
894                         p);
895         return p;
896 err_free_gss_pipe:
897         kfree(p);
898 err:
899         return ERR_PTR(err);
900 }
901 
902 struct gss_alloc_pdo {
903         struct rpc_clnt *clnt;
904         const char *name;
905         const struct rpc_pipe_ops *upcall_ops;
906 };
907 
908 static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
909 {
910         struct gss_pipe *gss_pipe;
911         struct gss_alloc_pdo *args = data;
912 
913         if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
914                 return 0;
915         gss_pipe = container_of(pdo, struct gss_pipe, pdo);
916         if (strcmp(gss_pipe->name, args->name) != 0)
917                 return 0;
918         if (!kref_get_unless_zero(&gss_pipe->kref))
919                 return 0;
920         return 1;
921 }
922 
923 static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
924 {
925         struct gss_pipe *gss_pipe;
926         struct gss_alloc_pdo *args = data;
927 
928         gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
929         if (!IS_ERR(gss_pipe))
930                 return &gss_pipe->pdo;
931         return NULL;
932 }
933 
934 static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
935                 const char *name,
936                 const struct rpc_pipe_ops *upcall_ops)
937 {
938         struct net *net = rpc_net_ns(clnt);
939         struct rpc_pipe_dir_object *pdo;
940         struct gss_alloc_pdo args = {
941                 .clnt = clnt,
942                 .name = name,
943                 .upcall_ops = upcall_ops,
944         };
945 
946         pdo = rpc_find_or_alloc_pipe_dir_object(net,
947                         &clnt->cl_pipedir_objects,
948                         gss_pipe_match_pdo,
949                         gss_pipe_alloc_pdo,
950                         &args);
951         if (pdo != NULL)
952                 return container_of(pdo, struct gss_pipe, pdo);
953         return ERR_PTR(-ENOMEM);
954 }
955 
956 static void __gss_pipe_free(struct gss_pipe *p)
957 {
958         struct rpc_clnt *clnt = p->clnt;
959         struct net *net = rpc_net_ns(clnt);
960 
961         rpc_remove_pipe_dir_object(net,
962                         &clnt->cl_pipedir_objects,
963                         &p->pdo);
964         rpc_destroy_pipe_data(p->pipe);
965         kfree(p);
966 }
967 
968 static void __gss_pipe_release(struct kref *kref)
969 {
970         struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
971 
972         __gss_pipe_free(p);
973 }
974 
975 static void gss_pipe_free(struct gss_pipe *p)
976 {
977         if (p != NULL)
978                 kref_put(&p->kref, __gss_pipe_release);
979 }
980 
981 /*
982  * NOTE: we have the opportunity to use different
983  * parameters based on the input flavor (which must be a pseudoflavor)
984  */
985 static struct gss_auth *
986 gss_create_new(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
987 {
988         rpc_authflavor_t flavor = args->pseudoflavor;
989         struct gss_auth *gss_auth;
990         struct gss_pipe *gss_pipe;
991         struct rpc_auth * auth;
992         int err = -ENOMEM; /* XXX? */
993 
994         dprintk("RPC:       creating GSS authenticator for client %p\n", clnt);
995 
996         if (!try_module_get(THIS_MODULE))
997                 return ERR_PTR(err);
998         if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
999                 goto out_dec;
1000         INIT_HLIST_NODE(&gss_auth->hash);
1001         gss_auth->target_name = NULL;
1002         if (args->target_name) {
1003                 gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
1004                 if (gss_auth->target_name == NULL)
1005                         goto err_free;
1006         }
1007         gss_auth->client = clnt;
1008         gss_auth->net = get_net(rpc_net_ns(clnt));
1009         err = -EINVAL;
1010         gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
1011         if (!gss_auth->mech) {
1012                 dprintk("RPC:       Pseudoflavor %d not found!\n", flavor);
1013                 goto err_put_net;
1014         }
1015         gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
1016         if (gss_auth->service == 0)
1017                 goto err_put_mech;
1018         if (!gssd_running(gss_auth->net))
1019                 goto err_put_mech;
1020         auth = &gss_auth->rpc_auth;
1021         auth->au_cslack = GSS_CRED_SLACK >> 2;
1022         auth->au_rslack = GSS_VERF_SLACK >> 2;
1023         auth->au_ops = &authgss_ops;
1024         auth->au_flavor = flavor;
1025         atomic_set(&auth->au_count, 1);
1026         kref_init(&gss_auth->kref);
1027 
1028         err = rpcauth_init_credcache(auth);
1029         if (err)
1030                 goto err_put_mech;
1031         /*
1032          * Note: if we created the old pipe first, then someone who
1033          * examined the directory at the right moment might conclude
1034          * that we supported only the old pipe.  So we instead create
1035          * the new pipe first.
1036          */
1037         gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
1038         if (IS_ERR(gss_pipe)) {
1039                 err = PTR_ERR(gss_pipe);
1040                 goto err_destroy_credcache;
1041         }
1042         gss_auth->gss_pipe[1] = gss_pipe;
1043 
1044         gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
1045                         &gss_upcall_ops_v0);
1046         if (IS_ERR(gss_pipe)) {
1047                 err = PTR_ERR(gss_pipe);
1048                 goto err_destroy_pipe_1;
1049         }
1050         gss_auth->gss_pipe[0] = gss_pipe;
1051 
1052         return gss_auth;
1053 err_destroy_pipe_1:
1054         gss_pipe_free(gss_auth->gss_pipe[1]);
1055 err_destroy_credcache:
1056         rpcauth_destroy_credcache(auth);
1057 err_put_mech:
1058         gss_mech_put(gss_auth->mech);
1059 err_put_net:
1060         put_net(gss_auth->net);
1061 err_free:
1062         kfree(gss_auth->target_name);
1063         kfree(gss_auth);
1064 out_dec:
1065         module_put(THIS_MODULE);
1066         return ERR_PTR(err);
1067 }
1068 
1069 static void
1070 gss_free(struct gss_auth *gss_auth)
1071 {
1072         gss_pipe_free(gss_auth->gss_pipe[0]);
1073         gss_pipe_free(gss_auth->gss_pipe[1]);
1074         gss_mech_put(gss_auth->mech);
1075         put_net(gss_auth->net);
1076         kfree(gss_auth->target_name);
1077 
1078         kfree(gss_auth);
1079         module_put(THIS_MODULE);
1080 }
1081 
1082 static void
1083 gss_free_callback(struct kref *kref)
1084 {
1085         struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1086 
1087         gss_free(gss_auth);
1088 }
1089 
1090 static void
1091 gss_put_auth(struct gss_auth *gss_auth)
1092 {
1093         kref_put(&gss_auth->kref, gss_free_callback);
1094 }
1095 
1096 static void
1097 gss_destroy(struct rpc_auth *auth)
1098 {
1099         struct gss_auth *gss_auth = container_of(auth,
1100                         struct gss_auth, rpc_auth);
1101 
1102         dprintk("RPC:       destroying GSS authenticator %p flavor %d\n",
1103                         auth, auth->au_flavor);
1104 
1105         if (hash_hashed(&gss_auth->hash)) {
1106                 spin_lock(&gss_auth_hash_lock);
1107                 hash_del(&gss_auth->hash);
1108                 spin_unlock(&gss_auth_hash_lock);
1109         }
1110 
1111         gss_pipe_free(gss_auth->gss_pipe[0]);
1112         gss_auth->gss_pipe[0] = NULL;
1113         gss_pipe_free(gss_auth->gss_pipe[1]);
1114         gss_auth->gss_pipe[1] = NULL;
1115         rpcauth_destroy_credcache(auth);
1116 
1117         gss_put_auth(gss_auth);
1118 }
1119 
1120 /*
1121  * Auths may be shared between rpc clients that were cloned from a
1122  * common client with the same xprt, if they also share the flavor and
1123  * target_name.
1124  *
1125  * The auth is looked up from the oldest parent sharing the same
1126  * cl_xprt, and the auth itself references only that common parent
1127  * (which is guaranteed to last as long as any of its descendants).
1128  */
1129 static struct gss_auth *
1130 gss_auth_find_or_add_hashed(struct rpc_auth_create_args *args,
1131                 struct rpc_clnt *clnt,
1132                 struct gss_auth *new)
1133 {
1134         struct gss_auth *gss_auth;
1135         unsigned long hashval = (unsigned long)clnt;
1136 
1137         spin_lock(&gss_auth_hash_lock);
1138         hash_for_each_possible(gss_auth_hash_table,
1139                         gss_auth,
1140                         hash,
1141                         hashval) {
1142                 if (gss_auth->client != clnt)
1143                         continue;
1144                 if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1145                         continue;
1146                 if (gss_auth->target_name != args->target_name) {
1147                         if (gss_auth->target_name == NULL)
1148                                 continue;
1149                         if (args->target_name == NULL)
1150                                 continue;
1151                         if (strcmp(gss_auth->target_name, args->target_name))
1152                                 continue;
1153                 }
1154                 if (!atomic_inc_not_zero(&gss_auth->rpc_auth.au_count))
1155                         continue;
1156                 goto out;
1157         }
1158         if (new)
1159                 hash_add(gss_auth_hash_table, &new->hash, hashval);
1160         gss_auth = new;
1161 out:
1162         spin_unlock(&gss_auth_hash_lock);
1163         return gss_auth;
1164 }
1165 
1166 static struct gss_auth *
1167 gss_create_hashed(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1168 {
1169         struct gss_auth *gss_auth;
1170         struct gss_auth *new;
1171 
1172         gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1173         if (gss_auth != NULL)
1174                 goto out;
1175         new = gss_create_new(args, clnt);
1176         if (IS_ERR(new))
1177                 return new;
1178         gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1179         if (gss_auth != new)
1180                 gss_destroy(&new->rpc_auth);
1181 out:
1182         return gss_auth;
1183 }
1184 
1185 static struct rpc_auth *
1186 gss_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1187 {
1188         struct gss_auth *gss_auth;
1189         struct rpc_xprt *xprt = rcu_access_pointer(clnt->cl_xprt);
1190 
1191         while (clnt != clnt->cl_parent) {
1192                 struct rpc_clnt *parent = clnt->cl_parent;
1193                 /* Find the original parent for this transport */
1194                 if (rcu_access_pointer(parent->cl_xprt) != xprt)
1195                         break;
1196                 clnt = parent;
1197         }
1198 
1199         gss_auth = gss_create_hashed(args, clnt);
1200         if (IS_ERR(gss_auth))
1201                 return ERR_CAST(gss_auth);
1202         return &gss_auth->rpc_auth;
1203 }
1204 
1205 /*
1206  * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
1207  * to the server with the GSS control procedure field set to
1208  * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
1209  * all RPCSEC_GSS state associated with that context.
1210  */
1211 static int
1212 gss_destroying_context(struct rpc_cred *cred)
1213 {
1214         struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1215         struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1216         struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1217         struct rpc_task *task;
1218 
1219         if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0)
1220                 return 0;
1221 
1222         ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1223         cred->cr_ops = &gss_nullops;
1224 
1225         /* Take a reference to ensure the cred will be destroyed either
1226          * by the RPC call or by the put_rpccred() below */
1227         get_rpccred(cred);
1228 
1229         task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT);
1230         if (!IS_ERR(task))
1231                 rpc_put_task(task);
1232 
1233         put_rpccred(cred);
1234         return 1;
1235 }
1236 
1237 /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
1238  * to create a new cred or context, so they check that things have been
1239  * allocated before freeing them. */
1240 static void
1241 gss_do_free_ctx(struct gss_cl_ctx *ctx)
1242 {
1243         dprintk("RPC:       %s\n", __func__);
1244 
1245         gss_delete_sec_context(&ctx->gc_gss_ctx);
1246         kfree(ctx->gc_wire_ctx.data);
1247         kfree(ctx->gc_acceptor.data);
1248         kfree(ctx);
1249 }
1250 
1251 static void
1252 gss_free_ctx_callback(struct rcu_head *head)
1253 {
1254         struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1255         gss_do_free_ctx(ctx);
1256 }
1257 
1258 static void
1259 gss_free_ctx(struct gss_cl_ctx *ctx)
1260 {
1261         call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1262 }
1263 
1264 static void
1265 gss_free_cred(struct gss_cred *gss_cred)
1266 {
1267         dprintk("RPC:       %s cred=%p\n", __func__, gss_cred);
1268         kfree(gss_cred);
1269 }
1270 
1271 static void
1272 gss_free_cred_callback(struct rcu_head *head)
1273 {
1274         struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1275         gss_free_cred(gss_cred);
1276 }
1277 
1278 static void
1279 gss_destroy_nullcred(struct rpc_cred *cred)
1280 {
1281         struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1282         struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1283         struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1284 
1285         RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1286         call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1287         if (ctx)
1288                 gss_put_ctx(ctx);
1289         gss_put_auth(gss_auth);
1290 }
1291 
1292 static void
1293 gss_destroy_cred(struct rpc_cred *cred)
1294 {
1295 
1296         if (gss_destroying_context(cred))
1297                 return;
1298         gss_destroy_nullcred(cred);
1299 }
1300 
1301 /*
1302  * Lookup RPCSEC_GSS cred for the current process
1303  */
1304 static struct rpc_cred *
1305 gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1306 {
1307         return rpcauth_lookup_credcache(auth, acred, flags);
1308 }
1309 
1310 static struct rpc_cred *
1311 gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1312 {
1313         struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1314         struct gss_cred *cred = NULL;
1315         int err = -ENOMEM;
1316 
1317         dprintk("RPC:       %s for uid %d, flavor %d\n",
1318                 __func__, from_kuid(&init_user_ns, acred->uid),
1319                 auth->au_flavor);
1320 
1321         if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS)))
1322                 goto out_err;
1323 
1324         rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1325         /*
1326          * Note: in order to force a call to call_refresh(), we deliberately
1327          * fail to flag the credential as RPCAUTH_CRED_UPTODATE.
1328          */
1329         cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1330         cred->gc_service = gss_auth->service;
1331         cred->gc_principal = NULL;
1332         if (acred->machine_cred)
1333                 cred->gc_principal = acred->principal;
1334         kref_get(&gss_auth->kref);
1335         return &cred->gc_base;
1336 
1337 out_err:
1338         dprintk("RPC:       %s failed with error %d\n", __func__, err);
1339         return ERR_PTR(err);
1340 }
1341 
1342 static int
1343 gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1344 {
1345         struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1346         struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1347         int err;
1348 
1349         do {
1350                 err = gss_create_upcall(gss_auth, gss_cred);
1351         } while (err == -EAGAIN);
1352         return err;
1353 }
1354 
1355 static char *
1356 gss_stringify_acceptor(struct rpc_cred *cred)
1357 {
1358         char *string = NULL;
1359         struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1360         struct gss_cl_ctx *ctx;
1361         unsigned int len;
1362         struct xdr_netobj *acceptor;
1363 
1364         rcu_read_lock();
1365         ctx = rcu_dereference(gss_cred->gc_ctx);
1366         if (!ctx)
1367                 goto out;
1368 
1369         len = ctx->gc_acceptor.len;
1370         rcu_read_unlock();
1371 
1372         /* no point if there's no string */
1373         if (!len)
1374                 return NULL;
1375 realloc:
1376         string = kmalloc(len + 1, GFP_KERNEL);
1377         if (!string)
1378                 return NULL;
1379 
1380         rcu_read_lock();
1381         ctx = rcu_dereference(gss_cred->gc_ctx);
1382 
1383         /* did the ctx disappear or was it replaced by one with no acceptor? */
1384         if (!ctx || !ctx->gc_acceptor.len) {
1385                 kfree(string);
1386                 string = NULL;
1387                 goto out;
1388         }
1389 
1390         acceptor = &ctx->gc_acceptor;
1391 
1392         /*
1393          * Did we find a new acceptor that's longer than the original? Allocate
1394          * a longer buffer and try again.
1395          */
1396         if (len < acceptor->len) {
1397                 len = acceptor->len;
1398                 rcu_read_unlock();
1399                 kfree(string);
1400                 goto realloc;
1401         }
1402 
1403         memcpy(string, acceptor->data, acceptor->len);
1404         string[acceptor->len] = '\0';
1405 out:
1406         rcu_read_unlock();
1407         return string;
1408 }
1409 
1410 /*
1411  * Returns -EACCES if GSS context is NULL or will expire within the
1412  * timeout (miliseconds)
1413  */
1414 static int
1415 gss_key_timeout(struct rpc_cred *rc)
1416 {
1417         struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1418         struct gss_cl_ctx *ctx;
1419         unsigned long now = jiffies;
1420         unsigned long expire;
1421 
1422         rcu_read_lock();
1423         ctx = rcu_dereference(gss_cred->gc_ctx);
1424         if (ctx)
1425                 expire = ctx->gc_expiry - (gss_key_expire_timeo * HZ);
1426         rcu_read_unlock();
1427         if (!ctx || time_after(now, expire))
1428                 return -EACCES;
1429         return 0;
1430 }
1431 
1432 static int
1433 gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1434 {
1435         struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1436         struct gss_cl_ctx *ctx;
1437         int ret;
1438 
1439         if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1440                 goto out;
1441         /* Don't match with creds that have expired. */
1442         rcu_read_lock();
1443         ctx = rcu_dereference(gss_cred->gc_ctx);
1444         if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1445                 rcu_read_unlock();
1446                 return 0;
1447         }
1448         rcu_read_unlock();
1449         if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1450                 return 0;
1451 out:
1452         if (acred->principal != NULL) {
1453                 if (gss_cred->gc_principal == NULL)
1454                         return 0;
1455                 ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1456                 goto check_expire;
1457         }
1458         if (gss_cred->gc_principal != NULL)
1459                 return 0;
1460         ret = uid_eq(rc->cr_uid, acred->uid);
1461 
1462 check_expire:
1463         if (ret == 0)
1464                 return ret;
1465 
1466         /* Notify acred users of GSS context expiration timeout */
1467         if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
1468             (gss_key_timeout(rc) != 0)) {
1469                 /* test will now be done from generic cred */
1470                 test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
1471                 /* tell NFS layer that key will expire soon */
1472                 set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
1473         }
1474         return ret;
1475 }
1476 
1477 /*
1478 * Marshal credentials.
1479 * Maybe we should keep a cached credential for performance reasons.
1480 */
1481 static __be32 *
1482 gss_marshal(struct rpc_task *task, __be32 *p)
1483 {
1484         struct rpc_rqst *req = task->tk_rqstp;
1485         struct rpc_cred *cred = req->rq_cred;
1486         struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1487                                                  gc_base);
1488         struct gss_cl_ctx       *ctx = gss_cred_get_ctx(cred);
1489         __be32          *cred_len;
1490         u32             maj_stat = 0;
1491         struct xdr_netobj mic;
1492         struct kvec     iov;
1493         struct xdr_buf  verf_buf;
1494 
1495         dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1496 
1497         *p++ = htonl(RPC_AUTH_GSS);
1498         cred_len = p++;
1499 
1500         spin_lock(&ctx->gc_seq_lock);
1501         req->rq_seqno = ctx->gc_seq++;
1502         spin_unlock(&ctx->gc_seq_lock);
1503 
1504         *p++ = htonl((u32) RPC_GSS_VERSION);
1505         *p++ = htonl((u32) ctx->gc_proc);
1506         *p++ = htonl((u32) req->rq_seqno);
1507         *p++ = htonl((u32) gss_cred->gc_service);
1508         p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1509         *cred_len = htonl((p - (cred_len + 1)) << 2);
1510 
1511         /* We compute the checksum for the verifier over the xdr-encoded bytes
1512          * starting with the xid and ending at the end of the credential: */
1513         iov.iov_base = xprt_skip_transport_header(req->rq_xprt,
1514                                         req->rq_snd_buf.head[0].iov_base);
1515         iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1516         xdr_buf_from_iov(&iov, &verf_buf);
1517 
1518         /* set verifier flavor*/
1519         *p++ = htonl(RPC_AUTH_GSS);
1520 
1521         mic.data = (u8 *)(p + 1);
1522         maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1523         if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
1524                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1525         } else if (maj_stat != 0) {
1526                 printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat);
1527                 goto out_put_ctx;
1528         }
1529         p = xdr_encode_opaque(p, NULL, mic.len);
1530         gss_put_ctx(ctx);
1531         return p;
1532 out_put_ctx:
1533         gss_put_ctx(ctx);
1534         return NULL;
1535 }
1536 
1537 static int gss_renew_cred(struct rpc_task *task)
1538 {
1539         struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1540         struct gss_cred *gss_cred = container_of(oldcred,
1541                                                  struct gss_cred,
1542                                                  gc_base);
1543         struct rpc_auth *auth = oldcred->cr_auth;
1544         struct auth_cred acred = {
1545                 .uid = oldcred->cr_uid,
1546                 .principal = gss_cred->gc_principal,
1547                 .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0),
1548         };
1549         struct rpc_cred *new;
1550 
1551         new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1552         if (IS_ERR(new))
1553                 return PTR_ERR(new);
1554         task->tk_rqstp->rq_cred = new;
1555         put_rpccred(oldcred);
1556         return 0;
1557 }
1558 
1559 static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1560 {
1561         if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1562                 unsigned long now = jiffies;
1563                 unsigned long begin, expire;
1564                 struct gss_cred *gss_cred; 
1565 
1566                 gss_cred = container_of(cred, struct gss_cred, gc_base);
1567                 begin = gss_cred->gc_upcall_timestamp;
1568                 expire = begin + gss_expired_cred_retry_delay * HZ;
1569 
1570                 if (time_in_range_open(now, begin, expire))
1571                         return 1;
1572         }
1573         return 0;
1574 }
1575 
1576 /*
1577 * Refresh credentials. XXX - finish
1578 */
1579 static int
1580 gss_refresh(struct rpc_task *task)
1581 {
1582         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1583         int ret = 0;
1584 
1585         if (gss_cred_is_negative_entry(cred))
1586                 return -EKEYEXPIRED;
1587 
1588         if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1589                         !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1590                 ret = gss_renew_cred(task);
1591                 if (ret < 0)
1592                         goto out;
1593                 cred = task->tk_rqstp->rq_cred;
1594         }
1595 
1596         if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1597                 ret = gss_refresh_upcall(task);
1598 out:
1599         return ret;
1600 }
1601 
1602 /* Dummy refresh routine: used only when destroying the context */
1603 static int
1604 gss_refresh_null(struct rpc_task *task)
1605 {
1606         return 0;
1607 }
1608 
1609 static __be32 *
1610 gss_validate(struct rpc_task *task, __be32 *p)
1611 {
1612         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1613         struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1614         __be32          seq;
1615         struct kvec     iov;
1616         struct xdr_buf  verf_buf;
1617         struct xdr_netobj mic;
1618         u32             flav,len;
1619         u32             maj_stat;
1620         __be32          *ret = ERR_PTR(-EIO);
1621 
1622         dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1623 
1624         flav = ntohl(*p++);
1625         if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE)
1626                 goto out_bad;
1627         if (flav != RPC_AUTH_GSS)
1628                 goto out_bad;
1629         seq = htonl(task->tk_rqstp->rq_seqno);
1630         iov.iov_base = &seq;
1631         iov.iov_len = sizeof(seq);
1632         xdr_buf_from_iov(&iov, &verf_buf);
1633         mic.data = (u8 *)p;
1634         mic.len = len;
1635 
1636         ret = ERR_PTR(-EACCES);
1637         maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1638         if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1639                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1640         if (maj_stat) {
1641                 dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n",
1642                         task->tk_pid, __func__, maj_stat);
1643                 goto out_bad;
1644         }
1645         /* We leave it to unwrap to calculate au_rslack. For now we just
1646          * calculate the length of the verifier: */
1647         cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1648         gss_put_ctx(ctx);
1649         dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n",
1650                         task->tk_pid, __func__);
1651         return p + XDR_QUADLEN(len);
1652 out_bad:
1653         gss_put_ctx(ctx);
1654         dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__,
1655                 PTR_ERR(ret));
1656         return ret;
1657 }
1658 
1659 static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
1660                                 __be32 *p, void *obj)
1661 {
1662         struct xdr_stream xdr;
1663 
1664         xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p);
1665         encode(rqstp, &xdr, obj);
1666 }
1667 
1668 static inline int
1669 gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1670                    kxdreproc_t encode, struct rpc_rqst *rqstp,
1671                    __be32 *p, void *obj)
1672 {
1673         struct xdr_buf  *snd_buf = &rqstp->rq_snd_buf;
1674         struct xdr_buf  integ_buf;
1675         __be32          *integ_len = NULL;
1676         struct xdr_netobj mic;
1677         u32             offset;
1678         __be32          *q;
1679         struct kvec     *iov;
1680         u32             maj_stat = 0;
1681         int             status = -EIO;
1682 
1683         integ_len = p++;
1684         offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1685         *p++ = htonl(rqstp->rq_seqno);
1686 
1687         gss_wrap_req_encode(encode, rqstp, p, obj);
1688 
1689         if (xdr_buf_subsegment(snd_buf, &integ_buf,
1690                                 offset, snd_buf->len - offset))
1691                 return status;
1692         *integ_len = htonl(integ_buf.len);
1693 
1694         /* guess whether we're in the head or the tail: */
1695         if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1696                 iov = snd_buf->tail;
1697         else
1698                 iov = snd_buf->head;
1699         p = iov->iov_base + iov->iov_len;
1700         mic.data = (u8 *)(p + 1);
1701 
1702         maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1703         status = -EIO; /* XXX? */
1704         if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1705                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1706         else if (maj_stat)
1707                 return status;
1708         q = xdr_encode_opaque(p, NULL, mic.len);
1709 
1710         offset = (u8 *)q - (u8 *)p;
1711         iov->iov_len += offset;
1712         snd_buf->len += offset;
1713         return 0;
1714 }
1715 
1716 static void
1717 priv_release_snd_buf(struct rpc_rqst *rqstp)
1718 {
1719         int i;
1720 
1721         for (i=0; i < rqstp->rq_enc_pages_num; i++)
1722                 __free_page(rqstp->rq_enc_pages[i]);
1723         kfree(rqstp->rq_enc_pages);
1724         rqstp->rq_release_snd_buf = NULL;
1725 }
1726 
1727 static int
1728 alloc_enc_pages(struct rpc_rqst *rqstp)
1729 {
1730         struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1731         int first, last, i;
1732 
1733         if (rqstp->rq_release_snd_buf)
1734                 rqstp->rq_release_snd_buf(rqstp);
1735 
1736         if (snd_buf->page_len == 0) {
1737                 rqstp->rq_enc_pages_num = 0;
1738                 return 0;
1739         }
1740 
1741         first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1742         last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
1743         rqstp->rq_enc_pages_num = last - first + 1 + 1;
1744         rqstp->rq_enc_pages
1745                 = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
1746                                 GFP_NOFS);
1747         if (!rqstp->rq_enc_pages)
1748                 goto out;
1749         for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1750                 rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
1751                 if (rqstp->rq_enc_pages[i] == NULL)
1752                         goto out_free;
1753         }
1754         rqstp->rq_release_snd_buf = priv_release_snd_buf;
1755         return 0;
1756 out_free:
1757         rqstp->rq_enc_pages_num = i;
1758         priv_release_snd_buf(rqstp);
1759 out:
1760         return -EAGAIN;
1761 }
1762 
1763 static inline int
1764 gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1765                   kxdreproc_t encode, struct rpc_rqst *rqstp,
1766                   __be32 *p, void *obj)
1767 {
1768         struct xdr_buf  *snd_buf = &rqstp->rq_snd_buf;
1769         u32             offset;
1770         u32             maj_stat;
1771         int             status;
1772         __be32          *opaque_len;
1773         struct page     **inpages;
1774         int             first;
1775         int             pad;
1776         struct kvec     *iov;
1777         char            *tmp;
1778 
1779         opaque_len = p++;
1780         offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1781         *p++ = htonl(rqstp->rq_seqno);
1782 
1783         gss_wrap_req_encode(encode, rqstp, p, obj);
1784 
1785         status = alloc_enc_pages(rqstp);
1786         if (status)
1787                 return status;
1788         first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
1789         inpages = snd_buf->pages + first;
1790         snd_buf->pages = rqstp->rq_enc_pages;
1791         snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
1792         /*
1793          * Give the tail its own page, in case we need extra space in the
1794          * head when wrapping:
1795          *
1796          * call_allocate() allocates twice the slack space required
1797          * by the authentication flavor to rq_callsize.
1798          * For GSS, slack is GSS_CRED_SLACK.
1799          */
1800         if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1801                 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1802                 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1803                 snd_buf->tail[0].iov_base = tmp;
1804         }
1805         maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1806         /* slack space should prevent this ever happening: */
1807         BUG_ON(snd_buf->len > snd_buf->buflen);
1808         status = -EIO;
1809         /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
1810          * done anyway, so it's safe to put the request on the wire: */
1811         if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1812                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1813         else if (maj_stat)
1814                 return status;
1815 
1816         *opaque_len = htonl(snd_buf->len - offset);
1817         /* guess whether we're in the head or the tail: */
1818         if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1819                 iov = snd_buf->tail;
1820         else
1821                 iov = snd_buf->head;
1822         p = iov->iov_base + iov->iov_len;
1823         pad = 3 - ((snd_buf->len - offset - 1) & 3);
1824         memset(p, 0, pad);
1825         iov->iov_len += pad;
1826         snd_buf->len += pad;
1827 
1828         return 0;
1829 }
1830 
1831 static int
1832 gss_wrap_req(struct rpc_task *task,
1833              kxdreproc_t encode, void *rqstp, __be32 *p, void *obj)
1834 {
1835         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1836         struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1837                         gc_base);
1838         struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1839         int             status = -EIO;
1840 
1841         dprintk("RPC: %5u %s\n", task->tk_pid, __func__);
1842         if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1843                 /* The spec seems a little ambiguous here, but I think that not
1844                  * wrapping context destruction requests makes the most sense.
1845                  */
1846                 gss_wrap_req_encode(encode, rqstp, p, obj);
1847                 status = 0;
1848                 goto out;
1849         }
1850         switch (gss_cred->gc_service) {
1851         case RPC_GSS_SVC_NONE:
1852                 gss_wrap_req_encode(encode, rqstp, p, obj);
1853                 status = 0;
1854                 break;
1855         case RPC_GSS_SVC_INTEGRITY:
1856                 status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj);
1857                 break;
1858         case RPC_GSS_SVC_PRIVACY:
1859                 status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj);
1860                 break;
1861         }
1862 out:
1863         gss_put_ctx(ctx);
1864         dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status);
1865         return status;
1866 }
1867 
1868 static inline int
1869 gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1870                 struct rpc_rqst *rqstp, __be32 **p)
1871 {
1872         struct xdr_buf  *rcv_buf = &rqstp->rq_rcv_buf;
1873         struct xdr_buf integ_buf;
1874         struct xdr_netobj mic;
1875         u32 data_offset, mic_offset;
1876         u32 integ_len;
1877         u32 maj_stat;
1878         int status = -EIO;
1879 
1880         integ_len = ntohl(*(*p)++);
1881         if (integ_len & 3)
1882                 return status;
1883         data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1884         mic_offset = integ_len + data_offset;
1885         if (mic_offset > rcv_buf->len)
1886                 return status;
1887         if (ntohl(*(*p)++) != rqstp->rq_seqno)
1888                 return status;
1889 
1890         if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset,
1891                                 mic_offset - data_offset))
1892                 return status;
1893 
1894         if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
1895                 return status;
1896 
1897         maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1898         if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1899                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1900         if (maj_stat != GSS_S_COMPLETE)
1901                 return status;
1902         return 0;
1903 }
1904 
1905 static inline int
1906 gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1907                 struct rpc_rqst *rqstp, __be32 **p)
1908 {
1909         struct xdr_buf  *rcv_buf = &rqstp->rq_rcv_buf;
1910         u32 offset;
1911         u32 opaque_len;
1912         u32 maj_stat;
1913         int status = -EIO;
1914 
1915         opaque_len = ntohl(*(*p)++);
1916         offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
1917         if (offset + opaque_len > rcv_buf->len)
1918                 return status;
1919         /* remove padding: */
1920         rcv_buf->len = offset + opaque_len;
1921 
1922         maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
1923         if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1924                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1925         if (maj_stat != GSS_S_COMPLETE)
1926                 return status;
1927         if (ntohl(*(*p)++) != rqstp->rq_seqno)
1928                 return status;
1929 
1930         return 0;
1931 }
1932 
1933 static int
1934 gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
1935                       __be32 *p, void *obj)
1936 {
1937         struct xdr_stream xdr;
1938 
1939         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
1940         return decode(rqstp, &xdr, obj);
1941 }
1942 
1943 static int
1944 gss_unwrap_resp(struct rpc_task *task,
1945                 kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj)
1946 {
1947         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1948         struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1949                         gc_base);
1950         struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1951         __be32          *savedp = p;
1952         struct kvec     *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
1953         int             savedlen = head->iov_len;
1954         int             status = -EIO;
1955 
1956         if (ctx->gc_proc != RPC_GSS_PROC_DATA)
1957                 goto out_decode;
1958         switch (gss_cred->gc_service) {
1959         case RPC_GSS_SVC_NONE:
1960                 break;
1961         case RPC_GSS_SVC_INTEGRITY:
1962                 status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p);
1963                 if (status)
1964                         goto out;
1965                 break;
1966         case RPC_GSS_SVC_PRIVACY:
1967                 status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
1968                 if (status)
1969                         goto out;
1970                 break;
1971         }
1972         /* take into account extra slack for integrity and privacy cases: */
1973         cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp)
1974                                                 + (savedlen - head->iov_len);
1975 out_decode:
1976         status = gss_unwrap_req_decode(decode, rqstp, p, obj);
1977 out:
1978         gss_put_ctx(ctx);
1979         dprintk("RPC: %5u %s returning %d\n",
1980                 task->tk_pid, __func__, status);
1981         return status;
1982 }
1983 
1984 static const struct rpc_authops authgss_ops = {
1985         .owner          = THIS_MODULE,
1986         .au_flavor      = RPC_AUTH_GSS,
1987         .au_name        = "RPCSEC_GSS",
1988         .create         = gss_create,
1989         .destroy        = gss_destroy,
1990         .lookup_cred    = gss_lookup_cred,
1991         .crcreate       = gss_create_cred,
1992         .list_pseudoflavors = gss_mech_list_pseudoflavors,
1993         .info2flavor    = gss_mech_info2flavor,
1994         .flavor2info    = gss_mech_flavor2info,
1995 };
1996 
1997 static const struct rpc_credops gss_credops = {
1998         .cr_name                = "AUTH_GSS",
1999         .crdestroy              = gss_destroy_cred,
2000         .cr_init                = gss_cred_init,
2001         .crbind                 = rpcauth_generic_bind_cred,
2002         .crmatch                = gss_match,
2003         .crmarshal              = gss_marshal,
2004         .crrefresh              = gss_refresh,
2005         .crvalidate             = gss_validate,
2006         .crwrap_req             = gss_wrap_req,
2007         .crunwrap_resp          = gss_unwrap_resp,
2008         .crkey_timeout          = gss_key_timeout,
2009         .crstringify_acceptor   = gss_stringify_acceptor,
2010 };
2011 
2012 static const struct rpc_credops gss_nullops = {
2013         .cr_name                = "AUTH_GSS",
2014         .crdestroy              = gss_destroy_nullcred,
2015         .crbind                 = rpcauth_generic_bind_cred,
2016         .crmatch                = gss_match,
2017         .crmarshal              = gss_marshal,
2018         .crrefresh              = gss_refresh_null,
2019         .crvalidate             = gss_validate,
2020         .crwrap_req             = gss_wrap_req,
2021         .crunwrap_resp          = gss_unwrap_resp,
2022         .crstringify_acceptor   = gss_stringify_acceptor,
2023 };
2024 
2025 static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
2026         .upcall         = rpc_pipe_generic_upcall,
2027         .downcall       = gss_pipe_downcall,
2028         .destroy_msg    = gss_pipe_destroy_msg,
2029         .open_pipe      = gss_pipe_open_v0,
2030         .release_pipe   = gss_pipe_release,
2031 };
2032 
2033 static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2034         .upcall         = rpc_pipe_generic_upcall,
2035         .downcall       = gss_pipe_downcall,
2036         .destroy_msg    = gss_pipe_destroy_msg,
2037         .open_pipe      = gss_pipe_open_v1,
2038         .release_pipe   = gss_pipe_release,
2039 };
2040 
2041 static __net_init int rpcsec_gss_init_net(struct net *net)
2042 {
2043         return gss_svc_init_net(net);
2044 }
2045 
2046 static __net_exit void rpcsec_gss_exit_net(struct net *net)
2047 {
2048         gss_svc_shutdown_net(net);
2049 }
2050 
2051 static struct pernet_operations rpcsec_gss_net_ops = {
2052         .init = rpcsec_gss_init_net,
2053         .exit = rpcsec_gss_exit_net,
2054 };
2055 
2056 /*
2057  * Initialize RPCSEC_GSS module
2058  */
2059 static int __init init_rpcsec_gss(void)
2060 {
2061         int err = 0;
2062 
2063         err = rpcauth_register(&authgss_ops);
2064         if (err)
2065                 goto out;
2066         err = gss_svc_init();
2067         if (err)
2068                 goto out_unregister;
2069         err = register_pernet_subsys(&rpcsec_gss_net_ops);
2070         if (err)
2071                 goto out_svc_exit;
2072         rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2073         return 0;
2074 out_svc_exit:
2075         gss_svc_shutdown();
2076 out_unregister:
2077         rpcauth_unregister(&authgss_ops);
2078 out:
2079         return err;
2080 }
2081 
2082 static void __exit exit_rpcsec_gss(void)
2083 {
2084         unregister_pernet_subsys(&rpcsec_gss_net_ops);
2085         gss_svc_shutdown();
2086         rpcauth_unregister(&authgss_ops);
2087         rcu_barrier(); /* Wait for completion of call_rcu()'s */
2088 }
2089 
2090 MODULE_ALIAS("rpc-auth-6");
2091 MODULE_LICENSE("GPL");
2092 module_param_named(expired_cred_retry_delay,
2093                    gss_expired_cred_retry_delay,
2094                    uint, 0644);
2095 MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2096                 "the RPC engine retries an expired credential");
2097 
2098 module_param_named(key_expire_timeo,
2099                    gss_key_expire_timeo,
2100                    uint, 0644);
2101 MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2102                 "credential keys lifetime where the NFS layer cleans up "
2103                 "prior to key expiration");
2104 
2105 module_init(init_rpcsec_gss)
2106 module_exit(exit_rpcsec_gss)
2107 

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