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14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/types.h>
17#include <linux/slab.h>
18#include <linux/sched.h>
19#include <linux/pagemap.h>
20#include <linux/sunrpc/clnt.h>
21#include <linux/sunrpc/auth.h>
22#include <linux/sunrpc/auth_gss.h>
23#include <linux/sunrpc/gss_krb5.h>
24#include <linux/sunrpc/svcauth_gss.h>
25#include <linux/sunrpc/gss_err.h>
26#include <linux/workqueue.h>
27#include <linux/sunrpc/rpc_pipe_fs.h>
28#include <linux/sunrpc/gss_api.h>
29#include <linux/uaccess.h>
30#include <linux/hashtable.h>
31
32#include "auth_gss_internal.h"
33#include "../netns.h"
34
35#include <trace/events/rpcgss.h>
36
37static const struct rpc_authops authgss_ops;
38
39static const struct rpc_credops gss_credops;
40static const struct rpc_credops gss_nullops;
41
42#define GSS_RETRY_EXPIRED 5
43static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED;
44
45#define GSS_KEY_EXPIRE_TIMEO 240
46static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO;
47
48#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
49# define RPCDBG_FACILITY RPCDBG_AUTH
50#endif
51
52#define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2)
53
54
55#define GSS_VERF_SLACK 100
56
57static DEFINE_HASHTABLE(gss_auth_hash_table, 4);
58static DEFINE_SPINLOCK(gss_auth_hash_lock);
59
60struct gss_pipe {
61 struct rpc_pipe_dir_object pdo;
62 struct rpc_pipe *pipe;
63 struct rpc_clnt *clnt;
64 const char *name;
65 struct kref kref;
66};
67
68struct gss_auth {
69 struct kref kref;
70 struct hlist_node hash;
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 net *net;
76 netns_tracker ns_tracker;
77
78
79
80
81
82
83 struct gss_pipe *gss_pipe[2];
84 const char *target_name;
85};
86
87
88static DEFINE_SPINLOCK(pipe_version_lock);
89static struct rpc_wait_queue pipe_version_rpc_waitqueue;
90static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
91static void gss_put_auth(struct gss_auth *gss_auth);
92
93static void gss_free_ctx(struct gss_cl_ctx *);
94static const struct rpc_pipe_ops gss_upcall_ops_v0;
95static const struct rpc_pipe_ops gss_upcall_ops_v1;
96
97static inline struct gss_cl_ctx *
98gss_get_ctx(struct gss_cl_ctx *ctx)
99{
100 refcount_inc(&ctx->count);
101 return ctx;
102}
103
104static inline void
105gss_put_ctx(struct gss_cl_ctx *ctx)
106{
107 if (refcount_dec_and_test(&ctx->count))
108 gss_free_ctx(ctx);
109}
110
111
112
113
114
115
116static void
117gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
118{
119 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
120
121 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
122 return;
123 gss_get_ctx(ctx);
124 rcu_assign_pointer(gss_cred->gc_ctx, ctx);
125 set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
126 smp_mb__before_atomic();
127 clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags);
128}
129
130static struct gss_cl_ctx *
131gss_cred_get_ctx(struct rpc_cred *cred)
132{
133 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
134 struct gss_cl_ctx *ctx = NULL;
135
136 rcu_read_lock();
137 ctx = rcu_dereference(gss_cred->gc_ctx);
138 if (ctx)
139 gss_get_ctx(ctx);
140 rcu_read_unlock();
141 return ctx;
142}
143
144static struct gss_cl_ctx *
145gss_alloc_context(void)
146{
147 struct gss_cl_ctx *ctx;
148
149 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
150 if (ctx != NULL) {
151 ctx->gc_proc = RPC_GSS_PROC_DATA;
152 ctx->gc_seq = 1;
153 spin_lock_init(&ctx->gc_seq_lock);
154 refcount_set(&ctx->count,1);
155 }
156 return ctx;
157}
158
159#define GSSD_MIN_TIMEOUT (60 * 60)
160static const void *
161gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
162{
163 const void *q;
164 unsigned int seclen;
165 unsigned int timeout;
166 unsigned long now = jiffies;
167 u32 window_size;
168 int ret;
169
170
171
172
173
174 p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
175 if (IS_ERR(p))
176 goto err;
177 if (timeout == 0)
178 timeout = GSSD_MIN_TIMEOUT;
179 ctx->gc_expiry = now + ((unsigned long)timeout * HZ);
180
181
182
183 p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
184 if (IS_ERR(p))
185 goto err;
186 ctx->gc_win = window_size;
187
188 if (ctx->gc_win == 0) {
189
190
191
192
193 p = simple_get_bytes(p, end, &ret, sizeof(ret));
194 if (!IS_ERR(p))
195 p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) :
196 ERR_PTR(-EACCES);
197 goto err;
198 }
199
200 p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
201 if (IS_ERR(p))
202 goto err;
203
204 p = simple_get_bytes(p, end, &seclen, sizeof(seclen));
205 if (IS_ERR(p))
206 goto err;
207 q = (const void *)((const char *)p + seclen);
208 if (unlikely(q > end || q < p)) {
209 p = ERR_PTR(-EFAULT);
210 goto err;
211 }
212 ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_KERNEL);
213 if (ret < 0) {
214 trace_rpcgss_import_ctx(ret);
215 p = ERR_PTR(ret);
216 goto err;
217 }
218
219
220 if (q == end) {
221 p = q;
222 goto done;
223 }
224
225
226 p = simple_get_netobj(q, end, &ctx->gc_acceptor);
227 if (IS_ERR(p))
228 goto err;
229done:
230 trace_rpcgss_context(window_size, ctx->gc_expiry, now, timeout,
231 ctx->gc_acceptor.len, ctx->gc_acceptor.data);
232err:
233 return p;
234}
235
236
237
238
239
240
241#define UPCALL_BUF_LEN 256
242
243struct gss_upcall_msg {
244 refcount_t count;
245 kuid_t uid;
246 const char *service_name;
247 struct rpc_pipe_msg msg;
248 struct list_head list;
249 struct gss_auth *auth;
250 struct rpc_pipe *pipe;
251 struct rpc_wait_queue rpc_waitqueue;
252 wait_queue_head_t waitqueue;
253 struct gss_cl_ctx *ctx;
254 char databuf[UPCALL_BUF_LEN];
255};
256
257static int get_pipe_version(struct net *net)
258{
259 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
260 int ret;
261
262 spin_lock(&pipe_version_lock);
263 if (sn->pipe_version >= 0) {
264 atomic_inc(&sn->pipe_users);
265 ret = sn->pipe_version;
266 } else
267 ret = -EAGAIN;
268 spin_unlock(&pipe_version_lock);
269 return ret;
270}
271
272static void put_pipe_version(struct net *net)
273{
274 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
275
276 if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) {
277 sn->pipe_version = -1;
278 spin_unlock(&pipe_version_lock);
279 }
280}
281
282static void
283gss_release_msg(struct gss_upcall_msg *gss_msg)
284{
285 struct net *net = gss_msg->auth->net;
286 if (!refcount_dec_and_test(&gss_msg->count))
287 return;
288 put_pipe_version(net);
289 BUG_ON(!list_empty(&gss_msg->list));
290 if (gss_msg->ctx != NULL)
291 gss_put_ctx(gss_msg->ctx);
292 rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
293 gss_put_auth(gss_msg->auth);
294 kfree_const(gss_msg->service_name);
295 kfree(gss_msg);
296}
297
298static struct gss_upcall_msg *
299__gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth)
300{
301 struct gss_upcall_msg *pos;
302 list_for_each_entry(pos, &pipe->in_downcall, list) {
303 if (!uid_eq(pos->uid, uid))
304 continue;
305 if (auth && pos->auth->service != auth->service)
306 continue;
307 refcount_inc(&pos->count);
308 return pos;
309 }
310 return NULL;
311}
312
313
314
315
316
317static inline struct gss_upcall_msg *
318gss_add_msg(struct gss_upcall_msg *gss_msg)
319{
320 struct rpc_pipe *pipe = gss_msg->pipe;
321 struct gss_upcall_msg *old;
322
323 spin_lock(&pipe->lock);
324 old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth);
325 if (old == NULL) {
326 refcount_inc(&gss_msg->count);
327 list_add(&gss_msg->list, &pipe->in_downcall);
328 } else
329 gss_msg = old;
330 spin_unlock(&pipe->lock);
331 return gss_msg;
332}
333
334static void
335__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
336{
337 list_del_init(&gss_msg->list);
338 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
339 wake_up_all(&gss_msg->waitqueue);
340 refcount_dec(&gss_msg->count);
341}
342
343static void
344gss_unhash_msg(struct gss_upcall_msg *gss_msg)
345{
346 struct rpc_pipe *pipe = gss_msg->pipe;
347
348 if (list_empty(&gss_msg->list))
349 return;
350 spin_lock(&pipe->lock);
351 if (!list_empty(&gss_msg->list))
352 __gss_unhash_msg(gss_msg);
353 spin_unlock(&pipe->lock);
354}
355
356static void
357gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg)
358{
359 switch (gss_msg->msg.errno) {
360 case 0:
361 if (gss_msg->ctx == NULL)
362 break;
363 clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
364 gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx);
365 break;
366 case -EKEYEXPIRED:
367 set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags);
368 }
369 gss_cred->gc_upcall_timestamp = jiffies;
370 gss_cred->gc_upcall = NULL;
371 rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
372}
373
374static void
375gss_upcall_callback(struct rpc_task *task)
376{
377 struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred,
378 struct gss_cred, gc_base);
379 struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
380 struct rpc_pipe *pipe = gss_msg->pipe;
381
382 spin_lock(&pipe->lock);
383 gss_handle_downcall_result(gss_cred, gss_msg);
384 spin_unlock(&pipe->lock);
385 task->tk_status = gss_msg->msg.errno;
386 gss_release_msg(gss_msg);
387}
388
389static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg,
390 const struct cred *cred)
391{
392 struct user_namespace *userns = cred->user_ns;
393
394 uid_t uid = from_kuid_munged(userns, gss_msg->uid);
395 memcpy(gss_msg->databuf, &uid, sizeof(uid));
396 gss_msg->msg.data = gss_msg->databuf;
397 gss_msg->msg.len = sizeof(uid);
398
399 BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf));
400}
401
402static ssize_t
403gss_v0_upcall(struct file *file, struct rpc_pipe_msg *msg,
404 char __user *buf, size_t buflen)
405{
406 struct gss_upcall_msg *gss_msg = container_of(msg,
407 struct gss_upcall_msg,
408 msg);
409 if (msg->copied == 0)
410 gss_encode_v0_msg(gss_msg, file->f_cred);
411 return rpc_pipe_generic_upcall(file, msg, buf, buflen);
412}
413
414static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
415 const char *service_name,
416 const char *target_name,
417 const struct cred *cred)
418{
419 struct user_namespace *userns = cred->user_ns;
420 struct gss_api_mech *mech = gss_msg->auth->mech;
421 char *p = gss_msg->databuf;
422 size_t buflen = sizeof(gss_msg->databuf);
423 int len;
424
425 len = scnprintf(p, buflen, "mech=%s uid=%d", mech->gm_name,
426 from_kuid_munged(userns, gss_msg->uid));
427 buflen -= len;
428 p += len;
429 gss_msg->msg.len = len;
430
431
432
433
434
435 if (target_name) {
436 len = scnprintf(p, buflen, " target=%s", target_name);
437 buflen -= len;
438 p += len;
439 gss_msg->msg.len += len;
440 }
441
442
443
444
445
446
447
448
449
450
451
452 if (service_name) {
453 char *c = strchr(service_name, '@');
454
455 if (!c)
456 len = scnprintf(p, buflen, " service=%s",
457 service_name);
458 else
459 len = scnprintf(p, buflen,
460 " service=%.*s srchost=%s",
461 (int)(c - service_name),
462 service_name, c + 1);
463 buflen -= len;
464 p += len;
465 gss_msg->msg.len += len;
466 }
467
468 if (mech->gm_upcall_enctypes) {
469 len = scnprintf(p, buflen, " enctypes=%s",
470 mech->gm_upcall_enctypes);
471 buflen -= len;
472 p += len;
473 gss_msg->msg.len += len;
474 }
475 trace_rpcgss_upcall_msg(gss_msg->databuf);
476 len = scnprintf(p, buflen, "\n");
477 if (len == 0)
478 goto out_overflow;
479 gss_msg->msg.len += len;
480 gss_msg->msg.data = gss_msg->databuf;
481 return 0;
482out_overflow:
483 WARN_ON_ONCE(1);
484 return -ENOMEM;
485}
486
487static ssize_t
488gss_v1_upcall(struct file *file, struct rpc_pipe_msg *msg,
489 char __user *buf, size_t buflen)
490{
491 struct gss_upcall_msg *gss_msg = container_of(msg,
492 struct gss_upcall_msg,
493 msg);
494 int err;
495 if (msg->copied == 0) {
496 err = gss_encode_v1_msg(gss_msg,
497 gss_msg->service_name,
498 gss_msg->auth->target_name,
499 file->f_cred);
500 if (err)
501 return err;
502 }
503 return rpc_pipe_generic_upcall(file, msg, buf, buflen);
504}
505
506static struct gss_upcall_msg *
507gss_alloc_msg(struct gss_auth *gss_auth,
508 kuid_t uid, const char *service_name)
509{
510 struct gss_upcall_msg *gss_msg;
511 int vers;
512 int err = -ENOMEM;
513
514 gss_msg = kzalloc(sizeof(*gss_msg), GFP_KERNEL);
515 if (gss_msg == NULL)
516 goto err;
517 vers = get_pipe_version(gss_auth->net);
518 err = vers;
519 if (err < 0)
520 goto err_free_msg;
521 gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe;
522 INIT_LIST_HEAD(&gss_msg->list);
523 rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
524 init_waitqueue_head(&gss_msg->waitqueue);
525 refcount_set(&gss_msg->count, 1);
526 gss_msg->uid = uid;
527 gss_msg->auth = gss_auth;
528 kref_get(&gss_auth->kref);
529 if (service_name) {
530 gss_msg->service_name = kstrdup_const(service_name, GFP_KERNEL);
531 if (!gss_msg->service_name) {
532 err = -ENOMEM;
533 goto err_put_pipe_version;
534 }
535 }
536 return gss_msg;
537err_put_pipe_version:
538 put_pipe_version(gss_auth->net);
539err_free_msg:
540 kfree(gss_msg);
541err:
542 return ERR_PTR(err);
543}
544
545static struct gss_upcall_msg *
546gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred)
547{
548 struct gss_cred *gss_cred = container_of(cred,
549 struct gss_cred, gc_base);
550 struct gss_upcall_msg *gss_new, *gss_msg;
551 kuid_t uid = cred->cr_cred->fsuid;
552
553 gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal);
554 if (IS_ERR(gss_new))
555 return gss_new;
556 gss_msg = gss_add_msg(gss_new);
557 if (gss_msg == gss_new) {
558 int res;
559 refcount_inc(&gss_msg->count);
560 res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
561 if (res) {
562 gss_unhash_msg(gss_new);
563 refcount_dec(&gss_msg->count);
564 gss_release_msg(gss_new);
565 gss_msg = ERR_PTR(res);
566 }
567 } else
568 gss_release_msg(gss_new);
569 return gss_msg;
570}
571
572static void warn_gssd(void)
573{
574 dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n");
575}
576
577static inline int
578gss_refresh_upcall(struct rpc_task *task)
579{
580 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
581 struct gss_auth *gss_auth = container_of(cred->cr_auth,
582 struct gss_auth, rpc_auth);
583 struct gss_cred *gss_cred = container_of(cred,
584 struct gss_cred, gc_base);
585 struct gss_upcall_msg *gss_msg;
586 struct rpc_pipe *pipe;
587 int err = 0;
588
589 gss_msg = gss_setup_upcall(gss_auth, cred);
590 if (PTR_ERR(gss_msg) == -EAGAIN) {
591
592
593 warn_gssd();
594 rpc_sleep_on_timeout(&pipe_version_rpc_waitqueue,
595 task, NULL, jiffies + (15 * HZ));
596 err = -EAGAIN;
597 goto out;
598 }
599 if (IS_ERR(gss_msg)) {
600 err = PTR_ERR(gss_msg);
601 goto out;
602 }
603 pipe = gss_msg->pipe;
604 spin_lock(&pipe->lock);
605 if (gss_cred->gc_upcall != NULL)
606 rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL);
607 else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
608 gss_cred->gc_upcall = gss_msg;
609
610 refcount_inc(&gss_msg->count);
611 rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback);
612 } else {
613 gss_handle_downcall_result(gss_cred, gss_msg);
614 err = gss_msg->msg.errno;
615 }
616 spin_unlock(&pipe->lock);
617 gss_release_msg(gss_msg);
618out:
619 trace_rpcgss_upcall_result(from_kuid(&init_user_ns,
620 cred->cr_cred->fsuid), err);
621 return err;
622}
623
624static inline int
625gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
626{
627 struct net *net = gss_auth->net;
628 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
629 struct rpc_pipe *pipe;
630 struct rpc_cred *cred = &gss_cred->gc_base;
631 struct gss_upcall_msg *gss_msg;
632 DEFINE_WAIT(wait);
633 int err;
634
635retry:
636 err = 0;
637
638 if (!gssd_running(net)) {
639 warn_gssd();
640 err = -EACCES;
641 goto out;
642 }
643 gss_msg = gss_setup_upcall(gss_auth, cred);
644 if (PTR_ERR(gss_msg) == -EAGAIN) {
645 err = wait_event_interruptible_timeout(pipe_version_waitqueue,
646 sn->pipe_version >= 0, 15 * HZ);
647 if (sn->pipe_version < 0) {
648 warn_gssd();
649 err = -EACCES;
650 }
651 if (err < 0)
652 goto out;
653 goto retry;
654 }
655 if (IS_ERR(gss_msg)) {
656 err = PTR_ERR(gss_msg);
657 goto out;
658 }
659 pipe = gss_msg->pipe;
660 for (;;) {
661 prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE);
662 spin_lock(&pipe->lock);
663 if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) {
664 break;
665 }
666 spin_unlock(&pipe->lock);
667 if (fatal_signal_pending(current)) {
668 err = -ERESTARTSYS;
669 goto out_intr;
670 }
671 schedule();
672 }
673 if (gss_msg->ctx) {
674 trace_rpcgss_ctx_init(gss_cred);
675 gss_cred_set_ctx(cred, gss_msg->ctx);
676 } else {
677 err = gss_msg->msg.errno;
678 }
679 spin_unlock(&pipe->lock);
680out_intr:
681 finish_wait(&gss_msg->waitqueue, &wait);
682 gss_release_msg(gss_msg);
683out:
684 trace_rpcgss_upcall_result(from_kuid(&init_user_ns,
685 cred->cr_cred->fsuid), err);
686 return err;
687}
688
689#define MSG_BUF_MAXSIZE 1024
690
691static ssize_t
692gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
693{
694 const void *p, *end;
695 void *buf;
696 struct gss_upcall_msg *gss_msg;
697 struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe;
698 struct gss_cl_ctx *ctx;
699 uid_t id;
700 kuid_t uid;
701 ssize_t err = -EFBIG;
702
703 if (mlen > MSG_BUF_MAXSIZE)
704 goto out;
705 err = -ENOMEM;
706 buf = kmalloc(mlen, GFP_KERNEL);
707 if (!buf)
708 goto out;
709
710 err = -EFAULT;
711 if (copy_from_user(buf, src, mlen))
712 goto err;
713
714 end = (const void *)((char *)buf + mlen);
715 p = simple_get_bytes(buf, end, &id, sizeof(id));
716 if (IS_ERR(p)) {
717 err = PTR_ERR(p);
718 goto err;
719 }
720
721 uid = make_kuid(current_user_ns(), id);
722 if (!uid_valid(uid)) {
723 err = -EINVAL;
724 goto err;
725 }
726
727 err = -ENOMEM;
728 ctx = gss_alloc_context();
729 if (ctx == NULL)
730 goto err;
731
732 err = -ENOENT;
733
734 spin_lock(&pipe->lock);
735 gss_msg = __gss_find_upcall(pipe, uid, NULL);
736 if (gss_msg == NULL) {
737 spin_unlock(&pipe->lock);
738 goto err_put_ctx;
739 }
740 list_del_init(&gss_msg->list);
741 spin_unlock(&pipe->lock);
742
743 p = gss_fill_context(p, end, ctx, gss_msg->auth->mech);
744 if (IS_ERR(p)) {
745 err = PTR_ERR(p);
746 switch (err) {
747 case -EACCES:
748 case -EKEYEXPIRED:
749 gss_msg->msg.errno = err;
750 err = mlen;
751 break;
752 case -EFAULT:
753 case -ENOMEM:
754 case -EINVAL:
755 case -ENOSYS:
756 gss_msg->msg.errno = -EAGAIN;
757 break;
758 default:
759 printk(KERN_CRIT "%s: bad return from "
760 "gss_fill_context: %zd\n", __func__, err);
761 gss_msg->msg.errno = -EIO;
762 }
763 goto err_release_msg;
764 }
765 gss_msg->ctx = gss_get_ctx(ctx);
766 err = mlen;
767
768err_release_msg:
769 spin_lock(&pipe->lock);
770 __gss_unhash_msg(gss_msg);
771 spin_unlock(&pipe->lock);
772 gss_release_msg(gss_msg);
773err_put_ctx:
774 gss_put_ctx(ctx);
775err:
776 kfree(buf);
777out:
778 return err;
779}
780
781static int gss_pipe_open(struct inode *inode, int new_version)
782{
783 struct net *net = inode->i_sb->s_fs_info;
784 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
785 int ret = 0;
786
787 spin_lock(&pipe_version_lock);
788 if (sn->pipe_version < 0) {
789
790 sn->pipe_version = new_version;
791 rpc_wake_up(&pipe_version_rpc_waitqueue);
792 wake_up(&pipe_version_waitqueue);
793 } else if (sn->pipe_version != new_version) {
794
795 ret = -EBUSY;
796 goto out;
797 }
798 atomic_inc(&sn->pipe_users);
799out:
800 spin_unlock(&pipe_version_lock);
801 return ret;
802
803}
804
805static int gss_pipe_open_v0(struct inode *inode)
806{
807 return gss_pipe_open(inode, 0);
808}
809
810static int gss_pipe_open_v1(struct inode *inode)
811{
812 return gss_pipe_open(inode, 1);
813}
814
815static void
816gss_pipe_release(struct inode *inode)
817{
818 struct net *net = inode->i_sb->s_fs_info;
819 struct rpc_pipe *pipe = RPC_I(inode)->pipe;
820 struct gss_upcall_msg *gss_msg;
821
822restart:
823 spin_lock(&pipe->lock);
824 list_for_each_entry(gss_msg, &pipe->in_downcall, list) {
825
826 if (!list_empty(&gss_msg->msg.list))
827 continue;
828 gss_msg->msg.errno = -EPIPE;
829 refcount_inc(&gss_msg->count);
830 __gss_unhash_msg(gss_msg);
831 spin_unlock(&pipe->lock);
832 gss_release_msg(gss_msg);
833 goto restart;
834 }
835 spin_unlock(&pipe->lock);
836
837 put_pipe_version(net);
838}
839
840static void
841gss_pipe_destroy_msg(struct rpc_pipe_msg *msg)
842{
843 struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg);
844
845 if (msg->errno < 0) {
846 refcount_inc(&gss_msg->count);
847 gss_unhash_msg(gss_msg);
848 if (msg->errno == -ETIMEDOUT)
849 warn_gssd();
850 gss_release_msg(gss_msg);
851 }
852 gss_release_msg(gss_msg);
853}
854
855static void gss_pipe_dentry_destroy(struct dentry *dir,
856 struct rpc_pipe_dir_object *pdo)
857{
858 struct gss_pipe *gss_pipe = pdo->pdo_data;
859 struct rpc_pipe *pipe = gss_pipe->pipe;
860
861 if (pipe->dentry != NULL) {
862 rpc_unlink(pipe->dentry);
863 pipe->dentry = NULL;
864 }
865}
866
867static int gss_pipe_dentry_create(struct dentry *dir,
868 struct rpc_pipe_dir_object *pdo)
869{
870 struct gss_pipe *p = pdo->pdo_data;
871 struct dentry *dentry;
872
873 dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe);
874 if (IS_ERR(dentry))
875 return PTR_ERR(dentry);
876 p->pipe->dentry = dentry;
877 return 0;
878}
879
880static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = {
881 .create = gss_pipe_dentry_create,
882 .destroy = gss_pipe_dentry_destroy,
883};
884
885static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt,
886 const char *name,
887 const struct rpc_pipe_ops *upcall_ops)
888{
889 struct gss_pipe *p;
890 int err = -ENOMEM;
891
892 p = kmalloc(sizeof(*p), GFP_KERNEL);
893 if (p == NULL)
894 goto err;
895 p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
896 if (IS_ERR(p->pipe)) {
897 err = PTR_ERR(p->pipe);
898 goto err_free_gss_pipe;
899 }
900 p->name = name;
901 p->clnt = clnt;
902 kref_init(&p->kref);
903 rpc_init_pipe_dir_object(&p->pdo,
904 &gss_pipe_dir_object_ops,
905 p);
906 return p;
907err_free_gss_pipe:
908 kfree(p);
909err:
910 return ERR_PTR(err);
911}
912
913struct gss_alloc_pdo {
914 struct rpc_clnt *clnt;
915 const char *name;
916 const struct rpc_pipe_ops *upcall_ops;
917};
918
919static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data)
920{
921 struct gss_pipe *gss_pipe;
922 struct gss_alloc_pdo *args = data;
923
924 if (pdo->pdo_ops != &gss_pipe_dir_object_ops)
925 return 0;
926 gss_pipe = container_of(pdo, struct gss_pipe, pdo);
927 if (strcmp(gss_pipe->name, args->name) != 0)
928 return 0;
929 if (!kref_get_unless_zero(&gss_pipe->kref))
930 return 0;
931 return 1;
932}
933
934static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data)
935{
936 struct gss_pipe *gss_pipe;
937 struct gss_alloc_pdo *args = data;
938
939 gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops);
940 if (!IS_ERR(gss_pipe))
941 return &gss_pipe->pdo;
942 return NULL;
943}
944
945static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt,
946 const char *name,
947 const struct rpc_pipe_ops *upcall_ops)
948{
949 struct net *net = rpc_net_ns(clnt);
950 struct rpc_pipe_dir_object *pdo;
951 struct gss_alloc_pdo args = {
952 .clnt = clnt,
953 .name = name,
954 .upcall_ops = upcall_ops,
955 };
956
957 pdo = rpc_find_or_alloc_pipe_dir_object(net,
958 &clnt->cl_pipedir_objects,
959 gss_pipe_match_pdo,
960 gss_pipe_alloc_pdo,
961 &args);
962 if (pdo != NULL)
963 return container_of(pdo, struct gss_pipe, pdo);
964 return ERR_PTR(-ENOMEM);
965}
966
967static void __gss_pipe_free(struct gss_pipe *p)
968{
969 struct rpc_clnt *clnt = p->clnt;
970 struct net *net = rpc_net_ns(clnt);
971
972 rpc_remove_pipe_dir_object(net,
973 &clnt->cl_pipedir_objects,
974 &p->pdo);
975 rpc_destroy_pipe_data(p->pipe);
976 kfree(p);
977}
978
979static void __gss_pipe_release(struct kref *kref)
980{
981 struct gss_pipe *p = container_of(kref, struct gss_pipe, kref);
982
983 __gss_pipe_free(p);
984}
985
986static void gss_pipe_free(struct gss_pipe *p)
987{
988 if (p != NULL)
989 kref_put(&p->kref, __gss_pipe_release);
990}
991
992
993
994
995
996static struct gss_auth *
997gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
998{
999 rpc_authflavor_t flavor = args->pseudoflavor;
1000 struct gss_auth *gss_auth;
1001 struct gss_pipe *gss_pipe;
1002 struct rpc_auth * auth;
1003 int err = -ENOMEM;
1004
1005 if (!try_module_get(THIS_MODULE))
1006 return ERR_PTR(err);
1007 if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL)))
1008 goto out_dec;
1009 INIT_HLIST_NODE(&gss_auth->hash);
1010 gss_auth->target_name = NULL;
1011 if (args->target_name) {
1012 gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL);
1013 if (gss_auth->target_name == NULL)
1014 goto err_free;
1015 }
1016 gss_auth->client = clnt;
1017 gss_auth->net = get_net_track(rpc_net_ns(clnt), &gss_auth->ns_tracker,
1018 GFP_KERNEL);
1019 err = -EINVAL;
1020 gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor);
1021 if (!gss_auth->mech)
1022 goto err_put_net;
1023 gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor);
1024 if (gss_auth->service == 0)
1025 goto err_put_mech;
1026 if (!gssd_running(gss_auth->net))
1027 goto err_put_mech;
1028 auth = &gss_auth->rpc_auth;
1029 auth->au_cslack = GSS_CRED_SLACK >> 2;
1030 auth->au_rslack = GSS_KRB5_MAX_SLACK_NEEDED >> 2;
1031 auth->au_verfsize = GSS_VERF_SLACK >> 2;
1032 auth->au_ralign = GSS_VERF_SLACK >> 2;
1033 __set_bit(RPCAUTH_AUTH_UPDATE_SLACK, &auth->au_flags);
1034 auth->au_ops = &authgss_ops;
1035 auth->au_flavor = flavor;
1036 if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor))
1037 __set_bit(RPCAUTH_AUTH_DATATOUCH, &auth->au_flags);
1038 refcount_set(&auth->au_count, 1);
1039 kref_init(&gss_auth->kref);
1040
1041 err = rpcauth_init_credcache(auth);
1042 if (err)
1043 goto err_put_mech;
1044
1045
1046
1047
1048
1049
1050 gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1);
1051 if (IS_ERR(gss_pipe)) {
1052 err = PTR_ERR(gss_pipe);
1053 goto err_destroy_credcache;
1054 }
1055 gss_auth->gss_pipe[1] = gss_pipe;
1056
1057 gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name,
1058 &gss_upcall_ops_v0);
1059 if (IS_ERR(gss_pipe)) {
1060 err = PTR_ERR(gss_pipe);
1061 goto err_destroy_pipe_1;
1062 }
1063 gss_auth->gss_pipe[0] = gss_pipe;
1064
1065 return gss_auth;
1066err_destroy_pipe_1:
1067 gss_pipe_free(gss_auth->gss_pipe[1]);
1068err_destroy_credcache:
1069 rpcauth_destroy_credcache(auth);
1070err_put_mech:
1071 gss_mech_put(gss_auth->mech);
1072err_put_net:
1073 put_net_track(gss_auth->net, &gss_auth->ns_tracker);
1074err_free:
1075 kfree(gss_auth->target_name);
1076 kfree(gss_auth);
1077out_dec:
1078 module_put(THIS_MODULE);
1079 trace_rpcgss_createauth(flavor, err);
1080 return ERR_PTR(err);
1081}
1082
1083static void
1084gss_free(struct gss_auth *gss_auth)
1085{
1086 gss_pipe_free(gss_auth->gss_pipe[0]);
1087 gss_pipe_free(gss_auth->gss_pipe[1]);
1088 gss_mech_put(gss_auth->mech);
1089 put_net_track(gss_auth->net, &gss_auth->ns_tracker);
1090 kfree(gss_auth->target_name);
1091
1092 kfree(gss_auth);
1093 module_put(THIS_MODULE);
1094}
1095
1096static void
1097gss_free_callback(struct kref *kref)
1098{
1099 struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref);
1100
1101 gss_free(gss_auth);
1102}
1103
1104static void
1105gss_put_auth(struct gss_auth *gss_auth)
1106{
1107 kref_put(&gss_auth->kref, gss_free_callback);
1108}
1109
1110static void
1111gss_destroy(struct rpc_auth *auth)
1112{
1113 struct gss_auth *gss_auth = container_of(auth,
1114 struct gss_auth, rpc_auth);
1115
1116 if (hash_hashed(&gss_auth->hash)) {
1117 spin_lock(&gss_auth_hash_lock);
1118 hash_del(&gss_auth->hash);
1119 spin_unlock(&gss_auth_hash_lock);
1120 }
1121
1122 gss_pipe_free(gss_auth->gss_pipe[0]);
1123 gss_auth->gss_pipe[0] = NULL;
1124 gss_pipe_free(gss_auth->gss_pipe[1]);
1125 gss_auth->gss_pipe[1] = NULL;
1126 rpcauth_destroy_credcache(auth);
1127
1128 gss_put_auth(gss_auth);
1129}
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140static struct gss_auth *
1141gss_auth_find_or_add_hashed(const struct rpc_auth_create_args *args,
1142 struct rpc_clnt *clnt,
1143 struct gss_auth *new)
1144{
1145 struct gss_auth *gss_auth;
1146 unsigned long hashval = (unsigned long)clnt;
1147
1148 spin_lock(&gss_auth_hash_lock);
1149 hash_for_each_possible(gss_auth_hash_table,
1150 gss_auth,
1151 hash,
1152 hashval) {
1153 if (gss_auth->client != clnt)
1154 continue;
1155 if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor)
1156 continue;
1157 if (gss_auth->target_name != args->target_name) {
1158 if (gss_auth->target_name == NULL)
1159 continue;
1160 if (args->target_name == NULL)
1161 continue;
1162 if (strcmp(gss_auth->target_name, args->target_name))
1163 continue;
1164 }
1165 if (!refcount_inc_not_zero(&gss_auth->rpc_auth.au_count))
1166 continue;
1167 goto out;
1168 }
1169 if (new)
1170 hash_add(gss_auth_hash_table, &new->hash, hashval);
1171 gss_auth = new;
1172out:
1173 spin_unlock(&gss_auth_hash_lock);
1174 return gss_auth;
1175}
1176
1177static struct gss_auth *
1178gss_create_hashed(const struct rpc_auth_create_args *args,
1179 struct rpc_clnt *clnt)
1180{
1181 struct gss_auth *gss_auth;
1182 struct gss_auth *new;
1183
1184 gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL);
1185 if (gss_auth != NULL)
1186 goto out;
1187 new = gss_create_new(args, clnt);
1188 if (IS_ERR(new))
1189 return new;
1190 gss_auth = gss_auth_find_or_add_hashed(args, clnt, new);
1191 if (gss_auth != new)
1192 gss_destroy(&new->rpc_auth);
1193out:
1194 return gss_auth;
1195}
1196
1197static struct rpc_auth *
1198gss_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
1199{
1200 struct gss_auth *gss_auth;
1201 struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch);
1202
1203 while (clnt != clnt->cl_parent) {
1204 struct rpc_clnt *parent = clnt->cl_parent;
1205
1206 if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps)
1207 break;
1208 clnt = parent;
1209 }
1210
1211 gss_auth = gss_create_hashed(args, clnt);
1212 if (IS_ERR(gss_auth))
1213 return ERR_CAST(gss_auth);
1214 return &gss_auth->rpc_auth;
1215}
1216
1217static struct gss_cred *
1218gss_dup_cred(struct gss_auth *gss_auth, struct gss_cred *gss_cred)
1219{
1220 struct gss_cred *new;
1221
1222
1223 new = kzalloc(sizeof(*gss_cred), GFP_KERNEL);
1224 if (new) {
1225 struct auth_cred acred = {
1226 .cred = gss_cred->gc_base.cr_cred,
1227 };
1228 struct gss_cl_ctx *ctx =
1229 rcu_dereference_protected(gss_cred->gc_ctx, 1);
1230
1231 rpcauth_init_cred(&new->gc_base, &acred,
1232 &gss_auth->rpc_auth,
1233 &gss_nullops);
1234 new->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
1235 new->gc_service = gss_cred->gc_service;
1236 new->gc_principal = gss_cred->gc_principal;
1237 kref_get(&gss_auth->kref);
1238 rcu_assign_pointer(new->gc_ctx, ctx);
1239 gss_get_ctx(ctx);
1240 }
1241 return new;
1242}
1243
1244
1245
1246
1247
1248
1249
1250static void
1251gss_send_destroy_context(struct rpc_cred *cred)
1252{
1253 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1254 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1255 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1256 struct gss_cred *new;
1257 struct rpc_task *task;
1258
1259 new = gss_dup_cred(gss_auth, gss_cred);
1260 if (new) {
1261 ctx->gc_proc = RPC_GSS_PROC_DESTROY;
1262
1263 trace_rpcgss_ctx_destroy(gss_cred);
1264 task = rpc_call_null(gss_auth->client, &new->gc_base,
1265 RPC_TASK_ASYNC);
1266 if (!IS_ERR(task))
1267 rpc_put_task(task);
1268
1269 put_rpccred(&new->gc_base);
1270 }
1271}
1272
1273
1274
1275
1276static void
1277gss_do_free_ctx(struct gss_cl_ctx *ctx)
1278{
1279 gss_delete_sec_context(&ctx->gc_gss_ctx);
1280 kfree(ctx->gc_wire_ctx.data);
1281 kfree(ctx->gc_acceptor.data);
1282 kfree(ctx);
1283}
1284
1285static void
1286gss_free_ctx_callback(struct rcu_head *head)
1287{
1288 struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu);
1289 gss_do_free_ctx(ctx);
1290}
1291
1292static void
1293gss_free_ctx(struct gss_cl_ctx *ctx)
1294{
1295 call_rcu(&ctx->gc_rcu, gss_free_ctx_callback);
1296}
1297
1298static void
1299gss_free_cred(struct gss_cred *gss_cred)
1300{
1301 kfree(gss_cred);
1302}
1303
1304static void
1305gss_free_cred_callback(struct rcu_head *head)
1306{
1307 struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu);
1308 gss_free_cred(gss_cred);
1309}
1310
1311static void
1312gss_destroy_nullcred(struct rpc_cred *cred)
1313{
1314 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1315 struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
1316 struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1);
1317
1318 RCU_INIT_POINTER(gss_cred->gc_ctx, NULL);
1319 put_cred(cred->cr_cred);
1320 call_rcu(&cred->cr_rcu, gss_free_cred_callback);
1321 if (ctx)
1322 gss_put_ctx(ctx);
1323 gss_put_auth(gss_auth);
1324}
1325
1326static void
1327gss_destroy_cred(struct rpc_cred *cred)
1328{
1329 if (test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0)
1330 gss_send_destroy_context(cred);
1331 gss_destroy_nullcred(cred);
1332}
1333
1334static int
1335gss_hash_cred(struct auth_cred *acred, unsigned int hashbits)
1336{
1337 return hash_64(from_kuid(&init_user_ns, acred->cred->fsuid), hashbits);
1338}
1339
1340
1341
1342
1343static struct rpc_cred *
1344gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
1345{
1346 gfp_t gfp = GFP_KERNEL;
1347
1348 if (flags & RPCAUTH_LOOKUP_ASYNC)
1349 gfp = GFP_NOWAIT | __GFP_NOWARN;
1350 return rpcauth_lookup_credcache(auth, acred, flags, gfp);
1351}
1352
1353static struct rpc_cred *
1354gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp)
1355{
1356 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1357 struct gss_cred *cred = NULL;
1358 int err = -ENOMEM;
1359
1360 if (!(cred = kzalloc(sizeof(*cred), gfp)))
1361 goto out_err;
1362
1363 rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops);
1364
1365
1366
1367
1368 cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
1369 cred->gc_service = gss_auth->service;
1370 cred->gc_principal = acred->principal;
1371 kref_get(&gss_auth->kref);
1372 return &cred->gc_base;
1373
1374out_err:
1375 return ERR_PTR(err);
1376}
1377
1378static int
1379gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred)
1380{
1381 struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth);
1382 struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base);
1383 int err;
1384
1385 do {
1386 err = gss_create_upcall(gss_auth, gss_cred);
1387 } while (err == -EAGAIN);
1388 return err;
1389}
1390
1391static char *
1392gss_stringify_acceptor(struct rpc_cred *cred)
1393{
1394 char *string = NULL;
1395 struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
1396 struct gss_cl_ctx *ctx;
1397 unsigned int len;
1398 struct xdr_netobj *acceptor;
1399
1400 rcu_read_lock();
1401 ctx = rcu_dereference(gss_cred->gc_ctx);
1402 if (!ctx)
1403 goto out;
1404
1405 len = ctx->gc_acceptor.len;
1406 rcu_read_unlock();
1407
1408
1409 if (!len)
1410 return NULL;
1411realloc:
1412 string = kmalloc(len + 1, GFP_KERNEL);
1413 if (!string)
1414 return NULL;
1415
1416 rcu_read_lock();
1417 ctx = rcu_dereference(gss_cred->gc_ctx);
1418
1419
1420 if (!ctx || !ctx->gc_acceptor.len) {
1421 kfree(string);
1422 string = NULL;
1423 goto out;
1424 }
1425
1426 acceptor = &ctx->gc_acceptor;
1427
1428
1429
1430
1431
1432 if (len < acceptor->len) {
1433 len = acceptor->len;
1434 rcu_read_unlock();
1435 kfree(string);
1436 goto realloc;
1437 }
1438
1439 memcpy(string, acceptor->data, acceptor->len);
1440 string[acceptor->len] = '\0';
1441out:
1442 rcu_read_unlock();
1443 return string;
1444}
1445
1446
1447
1448
1449
1450static int
1451gss_key_timeout(struct rpc_cred *rc)
1452{
1453 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1454 struct gss_cl_ctx *ctx;
1455 unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ);
1456 int ret = 0;
1457
1458 rcu_read_lock();
1459 ctx = rcu_dereference(gss_cred->gc_ctx);
1460 if (!ctx || time_after(timeout, ctx->gc_expiry))
1461 ret = -EACCES;
1462 rcu_read_unlock();
1463
1464 return ret;
1465}
1466
1467static int
1468gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
1469{
1470 struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base);
1471 struct gss_cl_ctx *ctx;
1472 int ret;
1473
1474 if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags))
1475 goto out;
1476
1477 rcu_read_lock();
1478 ctx = rcu_dereference(gss_cred->gc_ctx);
1479 if (!ctx || time_after(jiffies, ctx->gc_expiry)) {
1480 rcu_read_unlock();
1481 return 0;
1482 }
1483 rcu_read_unlock();
1484 if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags))
1485 return 0;
1486out:
1487 if (acred->principal != NULL) {
1488 if (gss_cred->gc_principal == NULL)
1489 return 0;
1490 ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
1491 } else {
1492 if (gss_cred->gc_principal != NULL)
1493 return 0;
1494 ret = uid_eq(rc->cr_cred->fsuid, acred->cred->fsuid);
1495 }
1496 return ret;
1497}
1498
1499
1500
1501
1502
1503
1504
1505
1506static int gss_marshal(struct rpc_task *task, struct xdr_stream *xdr)
1507{
1508 struct rpc_rqst *req = task->tk_rqstp;
1509 struct rpc_cred *cred = req->rq_cred;
1510 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1511 gc_base);
1512 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1513 __be32 *p, *cred_len;
1514 u32 maj_stat = 0;
1515 struct xdr_netobj mic;
1516 struct kvec iov;
1517 struct xdr_buf verf_buf;
1518 int status;
1519
1520
1521
1522 p = xdr_reserve_space(xdr, 7 * sizeof(*p) +
1523 ctx->gc_wire_ctx.len);
1524 if (!p)
1525 goto marshal_failed;
1526 *p++ = rpc_auth_gss;
1527 cred_len = p++;
1528
1529 spin_lock(&ctx->gc_seq_lock);
1530 req->rq_seqno = (ctx->gc_seq < MAXSEQ) ? ctx->gc_seq++ : MAXSEQ;
1531 spin_unlock(&ctx->gc_seq_lock);
1532 if (req->rq_seqno == MAXSEQ)
1533 goto expired;
1534 trace_rpcgss_seqno(task);
1535
1536 *p++ = cpu_to_be32(RPC_GSS_VERSION);
1537 *p++ = cpu_to_be32(ctx->gc_proc);
1538 *p++ = cpu_to_be32(req->rq_seqno);
1539 *p++ = cpu_to_be32(gss_cred->gc_service);
1540 p = xdr_encode_netobj(p, &ctx->gc_wire_ctx);
1541 *cred_len = cpu_to_be32((p - (cred_len + 1)) << 2);
1542
1543
1544
1545
1546
1547 iov.iov_base = req->rq_snd_buf.head[0].iov_base;
1548 iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
1549 xdr_buf_from_iov(&iov, &verf_buf);
1550
1551 p = xdr_reserve_space(xdr, sizeof(*p));
1552 if (!p)
1553 goto marshal_failed;
1554 *p++ = rpc_auth_gss;
1555 mic.data = (u8 *)(p + 1);
1556 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1557 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1558 goto expired;
1559 else if (maj_stat != 0)
1560 goto bad_mic;
1561 if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0)
1562 goto marshal_failed;
1563 status = 0;
1564out:
1565 gss_put_ctx(ctx);
1566 return status;
1567expired:
1568 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1569 status = -EKEYEXPIRED;
1570 goto out;
1571marshal_failed:
1572 status = -EMSGSIZE;
1573 goto out;
1574bad_mic:
1575 trace_rpcgss_get_mic(task, maj_stat);
1576 status = -EIO;
1577 goto out;
1578}
1579
1580static int gss_renew_cred(struct rpc_task *task)
1581{
1582 struct rpc_cred *oldcred = task->tk_rqstp->rq_cred;
1583 struct gss_cred *gss_cred = container_of(oldcred,
1584 struct gss_cred,
1585 gc_base);
1586 struct rpc_auth *auth = oldcred->cr_auth;
1587 struct auth_cred acred = {
1588 .cred = oldcred->cr_cred,
1589 .principal = gss_cred->gc_principal,
1590 };
1591 struct rpc_cred *new;
1592
1593 new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW);
1594 if (IS_ERR(new))
1595 return PTR_ERR(new);
1596
1597 task->tk_rqstp->rq_cred = new;
1598 put_rpccred(oldcred);
1599 return 0;
1600}
1601
1602static int gss_cred_is_negative_entry(struct rpc_cred *cred)
1603{
1604 if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) {
1605 unsigned long now = jiffies;
1606 unsigned long begin, expire;
1607 struct gss_cred *gss_cred;
1608
1609 gss_cred = container_of(cred, struct gss_cred, gc_base);
1610 begin = gss_cred->gc_upcall_timestamp;
1611 expire = begin + gss_expired_cred_retry_delay * HZ;
1612
1613 if (time_in_range_open(now, begin, expire))
1614 return 1;
1615 }
1616 return 0;
1617}
1618
1619
1620
1621
1622static int
1623gss_refresh(struct rpc_task *task)
1624{
1625 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1626 int ret = 0;
1627
1628 if (gss_cred_is_negative_entry(cred))
1629 return -EKEYEXPIRED;
1630
1631 if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
1632 !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) {
1633 ret = gss_renew_cred(task);
1634 if (ret < 0)
1635 goto out;
1636 cred = task->tk_rqstp->rq_cred;
1637 }
1638
1639 if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags))
1640 ret = gss_refresh_upcall(task);
1641out:
1642 return ret;
1643}
1644
1645
1646static int
1647gss_refresh_null(struct rpc_task *task)
1648{
1649 return 0;
1650}
1651
1652static int
1653gss_validate(struct rpc_task *task, struct xdr_stream *xdr)
1654{
1655 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1656 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1657 __be32 *p, *seq = NULL;
1658 struct kvec iov;
1659 struct xdr_buf verf_buf;
1660 struct xdr_netobj mic;
1661 u32 len, maj_stat;
1662 int status;
1663
1664 p = xdr_inline_decode(xdr, 2 * sizeof(*p));
1665 if (!p)
1666 goto validate_failed;
1667 if (*p++ != rpc_auth_gss)
1668 goto validate_failed;
1669 len = be32_to_cpup(p);
1670 if (len > RPC_MAX_AUTH_SIZE)
1671 goto validate_failed;
1672 p = xdr_inline_decode(xdr, len);
1673 if (!p)
1674 goto validate_failed;
1675
1676 seq = kmalloc(4, GFP_KERNEL);
1677 if (!seq)
1678 goto validate_failed;
1679 *seq = cpu_to_be32(task->tk_rqstp->rq_seqno);
1680 iov.iov_base = seq;
1681 iov.iov_len = 4;
1682 xdr_buf_from_iov(&iov, &verf_buf);
1683 mic.data = (u8 *)p;
1684 mic.len = len;
1685 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
1686 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1687 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1688 if (maj_stat)
1689 goto bad_mic;
1690
1691
1692
1693 if (test_bit(RPCAUTH_AUTH_UPDATE_SLACK, &cred->cr_auth->au_flags))
1694 cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
1695 status = 0;
1696out:
1697 gss_put_ctx(ctx);
1698 kfree(seq);
1699 return status;
1700
1701validate_failed:
1702 status = -EIO;
1703 goto out;
1704bad_mic:
1705 trace_rpcgss_verify_mic(task, maj_stat);
1706 status = -EACCES;
1707 goto out;
1708}
1709
1710static noinline_for_stack int
1711gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1712 struct rpc_task *task, struct xdr_stream *xdr)
1713{
1714 struct rpc_rqst *rqstp = task->tk_rqstp;
1715 struct xdr_buf integ_buf, *snd_buf = &rqstp->rq_snd_buf;
1716 struct xdr_netobj mic;
1717 __be32 *p, *integ_len;
1718 u32 offset, maj_stat;
1719
1720 p = xdr_reserve_space(xdr, 2 * sizeof(*p));
1721 if (!p)
1722 goto wrap_failed;
1723 integ_len = p++;
1724 *p = cpu_to_be32(rqstp->rq_seqno);
1725
1726 if (rpcauth_wrap_req_encode(task, xdr))
1727 goto wrap_failed;
1728
1729 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1730 if (xdr_buf_subsegment(snd_buf, &integ_buf,
1731 offset, snd_buf->len - offset))
1732 goto wrap_failed;
1733 *integ_len = cpu_to_be32(integ_buf.len);
1734
1735 p = xdr_reserve_space(xdr, 0);
1736 if (!p)
1737 goto wrap_failed;
1738 mic.data = (u8 *)(p + 1);
1739 maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
1740 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1741 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1742 else if (maj_stat)
1743 goto bad_mic;
1744
1745 if (xdr_stream_encode_opaque_inline(xdr, (void **)&p, mic.len) < 0)
1746 goto wrap_failed;
1747 return 0;
1748wrap_failed:
1749 return -EMSGSIZE;
1750bad_mic:
1751 trace_rpcgss_get_mic(task, maj_stat);
1752 return -EIO;
1753}
1754
1755static void
1756priv_release_snd_buf(struct rpc_rqst *rqstp)
1757{
1758 int i;
1759
1760 for (i=0; i < rqstp->rq_enc_pages_num; i++)
1761 __free_page(rqstp->rq_enc_pages[i]);
1762 kfree(rqstp->rq_enc_pages);
1763 rqstp->rq_release_snd_buf = NULL;
1764}
1765
1766static int
1767alloc_enc_pages(struct rpc_rqst *rqstp)
1768{
1769 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1770 int first, last, i;
1771
1772 if (rqstp->rq_release_snd_buf)
1773 rqstp->rq_release_snd_buf(rqstp);
1774
1775 if (snd_buf->page_len == 0) {
1776 rqstp->rq_enc_pages_num = 0;
1777 return 0;
1778 }
1779
1780 first = snd_buf->page_base >> PAGE_SHIFT;
1781 last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT;
1782 rqstp->rq_enc_pages_num = last - first + 1 + 1;
1783 rqstp->rq_enc_pages
1784 = kmalloc_array(rqstp->rq_enc_pages_num,
1785 sizeof(struct page *),
1786 GFP_KERNEL);
1787 if (!rqstp->rq_enc_pages)
1788 goto out;
1789 for (i=0; i < rqstp->rq_enc_pages_num; i++) {
1790 rqstp->rq_enc_pages[i] = alloc_page(GFP_KERNEL);
1791 if (rqstp->rq_enc_pages[i] == NULL)
1792 goto out_free;
1793 }
1794 rqstp->rq_release_snd_buf = priv_release_snd_buf;
1795 return 0;
1796out_free:
1797 rqstp->rq_enc_pages_num = i;
1798 priv_release_snd_buf(rqstp);
1799out:
1800 return -EAGAIN;
1801}
1802
1803static noinline_for_stack int
1804gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
1805 struct rpc_task *task, struct xdr_stream *xdr)
1806{
1807 struct rpc_rqst *rqstp = task->tk_rqstp;
1808 struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
1809 u32 pad, offset, maj_stat;
1810 int status;
1811 __be32 *p, *opaque_len;
1812 struct page **inpages;
1813 int first;
1814 struct kvec *iov;
1815
1816 status = -EIO;
1817 p = xdr_reserve_space(xdr, 2 * sizeof(*p));
1818 if (!p)
1819 goto wrap_failed;
1820 opaque_len = p++;
1821 *p = cpu_to_be32(rqstp->rq_seqno);
1822
1823 if (rpcauth_wrap_req_encode(task, xdr))
1824 goto wrap_failed;
1825
1826 status = alloc_enc_pages(rqstp);
1827 if (unlikely(status))
1828 goto wrap_failed;
1829 first = snd_buf->page_base >> PAGE_SHIFT;
1830 inpages = snd_buf->pages + first;
1831 snd_buf->pages = rqstp->rq_enc_pages;
1832 snd_buf->page_base -= first << PAGE_SHIFT;
1833
1834
1835
1836
1837
1838
1839 if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
1840 char *tmp;
1841
1842 tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
1843 memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
1844 snd_buf->tail[0].iov_base = tmp;
1845 }
1846 offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
1847 maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
1848
1849 if (unlikely(snd_buf->len > snd_buf->buflen))
1850 goto wrap_failed;
1851
1852
1853 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
1854 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
1855 else if (maj_stat)
1856 goto bad_wrap;
1857
1858 *opaque_len = cpu_to_be32(snd_buf->len - offset);
1859
1860 if (snd_buf->page_len || snd_buf->tail[0].iov_len)
1861 iov = snd_buf->tail;
1862 else
1863 iov = snd_buf->head;
1864 p = iov->iov_base + iov->iov_len;
1865 pad = xdr_pad_size(snd_buf->len - offset);
1866 memset(p, 0, pad);
1867 iov->iov_len += pad;
1868 snd_buf->len += pad;
1869
1870 return 0;
1871wrap_failed:
1872 return status;
1873bad_wrap:
1874 trace_rpcgss_wrap(task, maj_stat);
1875 return -EIO;
1876}
1877
1878static int gss_wrap_req(struct rpc_task *task, struct xdr_stream *xdr)
1879{
1880 struct rpc_cred *cred = task->tk_rqstp->rq_cred;
1881 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
1882 gc_base);
1883 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
1884 int status;
1885
1886 status = -EIO;
1887 if (ctx->gc_proc != RPC_GSS_PROC_DATA) {
1888
1889
1890
1891 status = rpcauth_wrap_req_encode(task, xdr);
1892 goto out;
1893 }
1894 switch (gss_cred->gc_service) {
1895 case RPC_GSS_SVC_NONE:
1896 status = rpcauth_wrap_req_encode(task, xdr);
1897 break;
1898 case RPC_GSS_SVC_INTEGRITY:
1899 status = gss_wrap_req_integ(cred, ctx, task, xdr);
1900 break;
1901 case RPC_GSS_SVC_PRIVACY:
1902 status = gss_wrap_req_priv(cred, ctx, task, xdr);
1903 break;
1904 default:
1905 status = -EIO;
1906 }
1907out:
1908 gss_put_ctx(ctx);
1909 return status;
1910}
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920static void gss_update_rslack(struct rpc_task *task, struct rpc_cred *cred,
1921 unsigned int before, unsigned int after)
1922{
1923 struct rpc_auth *auth = cred->cr_auth;
1924
1925 if (test_and_clear_bit(RPCAUTH_AUTH_UPDATE_SLACK, &auth->au_flags)) {
1926 auth->au_ralign = auth->au_verfsize + before;
1927 auth->au_rslack = auth->au_verfsize + after;
1928 trace_rpcgss_update_slack(task, auth);
1929 }
1930}
1931
1932static int
1933gss_unwrap_resp_auth(struct rpc_task *task, struct rpc_cred *cred)
1934{
1935 gss_update_rslack(task, cred, 0, 0);
1936 return 0;
1937}
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952static noinline_for_stack int
1953gss_unwrap_resp_integ(struct rpc_task *task, struct rpc_cred *cred,
1954 struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
1955 struct xdr_stream *xdr)
1956{
1957 struct xdr_buf gss_data, *rcv_buf = &rqstp->rq_rcv_buf;
1958 u32 len, offset, seqno, maj_stat;
1959 struct xdr_netobj mic;
1960 int ret;
1961
1962 ret = -EIO;
1963 mic.data = NULL;
1964
1965
1966 if (xdr_stream_decode_u32(xdr, &len))
1967 goto unwrap_failed;
1968 if (len & 3)
1969 goto unwrap_failed;
1970 offset = rcv_buf->len - xdr_stream_remaining(xdr);
1971 if (xdr_stream_decode_u32(xdr, &seqno))
1972 goto unwrap_failed;
1973 if (seqno != rqstp->rq_seqno)
1974 goto bad_seqno;
1975 if (xdr_buf_subsegment(rcv_buf, &gss_data, offset, len))
1976 goto unwrap_failed;
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987 offset += len;
1988 if (xdr_decode_word(rcv_buf, offset, &len))
1989 goto unwrap_failed;
1990 offset += sizeof(__be32);
1991 if (offset + len > rcv_buf->len)
1992 goto unwrap_failed;
1993 mic.len = len;
1994 mic.data = kmalloc(len, GFP_KERNEL);
1995 if (!mic.data)
1996 goto unwrap_failed;
1997 if (read_bytes_from_xdr_buf(rcv_buf, offset, mic.data, mic.len))
1998 goto unwrap_failed;
1999
2000 maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &gss_data, &mic);
2001 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
2002 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
2003 if (maj_stat != GSS_S_COMPLETE)
2004 goto bad_mic;
2005
2006 gss_update_rslack(task, cred, 2, 2 + 1 + XDR_QUADLEN(mic.len));
2007 ret = 0;
2008
2009out:
2010 kfree(mic.data);
2011 return ret;
2012
2013unwrap_failed:
2014 trace_rpcgss_unwrap_failed(task);
2015 goto out;
2016bad_seqno:
2017 trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, seqno);
2018 goto out;
2019bad_mic:
2020 trace_rpcgss_verify_mic(task, maj_stat);
2021 goto out;
2022}
2023
2024static noinline_for_stack int
2025gss_unwrap_resp_priv(struct rpc_task *task, struct rpc_cred *cred,
2026 struct gss_cl_ctx *ctx, struct rpc_rqst *rqstp,
2027 struct xdr_stream *xdr)
2028{
2029 struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
2030 struct kvec *head = rqstp->rq_rcv_buf.head;
2031 u32 offset, opaque_len, maj_stat;
2032 __be32 *p;
2033
2034 p = xdr_inline_decode(xdr, 2 * sizeof(*p));
2035 if (unlikely(!p))
2036 goto unwrap_failed;
2037 opaque_len = be32_to_cpup(p++);
2038 offset = (u8 *)(p) - (u8 *)head->iov_base;
2039 if (offset + opaque_len > rcv_buf->len)
2040 goto unwrap_failed;
2041
2042 maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset,
2043 offset + opaque_len, rcv_buf);
2044 if (maj_stat == GSS_S_CONTEXT_EXPIRED)
2045 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
2046 if (maj_stat != GSS_S_COMPLETE)
2047 goto bad_unwrap;
2048
2049 if (be32_to_cpup(p++) != rqstp->rq_seqno)
2050 goto bad_seqno;
2051
2052
2053
2054
2055 xdr_init_decode(xdr, rcv_buf, p, rqstp);
2056
2057 gss_update_rslack(task, cred, 2 + ctx->gc_gss_ctx->align,
2058 2 + ctx->gc_gss_ctx->slack);
2059
2060 return 0;
2061unwrap_failed:
2062 trace_rpcgss_unwrap_failed(task);
2063 return -EIO;
2064bad_seqno:
2065 trace_rpcgss_bad_seqno(task, rqstp->rq_seqno, be32_to_cpup(--p));
2066 return -EIO;
2067bad_unwrap:
2068 trace_rpcgss_unwrap(task, maj_stat);
2069 return -EIO;
2070}
2071
2072static bool
2073gss_seq_is_newer(u32 new, u32 old)
2074{
2075 return (s32)(new - old) > 0;
2076}
2077
2078static bool
2079gss_xmit_need_reencode(struct rpc_task *task)
2080{
2081 struct rpc_rqst *req = task->tk_rqstp;
2082 struct rpc_cred *cred = req->rq_cred;
2083 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
2084 u32 win, seq_xmit = 0;
2085 bool ret = true;
2086
2087 if (!ctx)
2088 goto out;
2089
2090 if (gss_seq_is_newer(req->rq_seqno, READ_ONCE(ctx->gc_seq)))
2091 goto out_ctx;
2092
2093 seq_xmit = READ_ONCE(ctx->gc_seq_xmit);
2094 while (gss_seq_is_newer(req->rq_seqno, seq_xmit)) {
2095 u32 tmp = seq_xmit;
2096
2097 seq_xmit = cmpxchg(&ctx->gc_seq_xmit, tmp, req->rq_seqno);
2098 if (seq_xmit == tmp) {
2099 ret = false;
2100 goto out_ctx;
2101 }
2102 }
2103
2104 win = ctx->gc_win;
2105 if (win > 0)
2106 ret = !gss_seq_is_newer(req->rq_seqno, seq_xmit - win);
2107
2108out_ctx:
2109 gss_put_ctx(ctx);
2110out:
2111 trace_rpcgss_need_reencode(task, seq_xmit, ret);
2112 return ret;
2113}
2114
2115static int
2116gss_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr)
2117{
2118 struct rpc_rqst *rqstp = task->tk_rqstp;
2119 struct rpc_cred *cred = rqstp->rq_cred;
2120 struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
2121 gc_base);
2122 struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
2123 int status = -EIO;
2124
2125 if (ctx->gc_proc != RPC_GSS_PROC_DATA)
2126 goto out_decode;
2127 switch (gss_cred->gc_service) {
2128 case RPC_GSS_SVC_NONE:
2129 status = gss_unwrap_resp_auth(task, cred);
2130 break;
2131 case RPC_GSS_SVC_INTEGRITY:
2132 status = gss_unwrap_resp_integ(task, cred, ctx, rqstp, xdr);
2133 break;
2134 case RPC_GSS_SVC_PRIVACY:
2135 status = gss_unwrap_resp_priv(task, cred, ctx, rqstp, xdr);
2136 break;
2137 }
2138 if (status)
2139 goto out;
2140
2141out_decode:
2142 status = rpcauth_unwrap_resp_decode(task, xdr);
2143out:
2144 gss_put_ctx(ctx);
2145 return status;
2146}
2147
2148static const struct rpc_authops authgss_ops = {
2149 .owner = THIS_MODULE,
2150 .au_flavor = RPC_AUTH_GSS,
2151 .au_name = "RPCSEC_GSS",
2152 .create = gss_create,
2153 .destroy = gss_destroy,
2154 .hash_cred = gss_hash_cred,
2155 .lookup_cred = gss_lookup_cred,
2156 .crcreate = gss_create_cred,
2157 .info2flavor = gss_mech_info2flavor,
2158 .flavor2info = gss_mech_flavor2info,
2159};
2160
2161static const struct rpc_credops gss_credops = {
2162 .cr_name = "AUTH_GSS",
2163 .crdestroy = gss_destroy_cred,
2164 .cr_init = gss_cred_init,
2165 .crmatch = gss_match,
2166 .crmarshal = gss_marshal,
2167 .crrefresh = gss_refresh,
2168 .crvalidate = gss_validate,
2169 .crwrap_req = gss_wrap_req,
2170 .crunwrap_resp = gss_unwrap_resp,
2171 .crkey_timeout = gss_key_timeout,
2172 .crstringify_acceptor = gss_stringify_acceptor,
2173 .crneed_reencode = gss_xmit_need_reencode,
2174};
2175
2176static const struct rpc_credops gss_nullops = {
2177 .cr_name = "AUTH_GSS",
2178 .crdestroy = gss_destroy_nullcred,
2179 .crmatch = gss_match,
2180 .crmarshal = gss_marshal,
2181 .crrefresh = gss_refresh_null,
2182 .crvalidate = gss_validate,
2183 .crwrap_req = gss_wrap_req,
2184 .crunwrap_resp = gss_unwrap_resp,
2185 .crstringify_acceptor = gss_stringify_acceptor,
2186};
2187
2188static const struct rpc_pipe_ops gss_upcall_ops_v0 = {
2189 .upcall = gss_v0_upcall,
2190 .downcall = gss_pipe_downcall,
2191 .destroy_msg = gss_pipe_destroy_msg,
2192 .open_pipe = gss_pipe_open_v0,
2193 .release_pipe = gss_pipe_release,
2194};
2195
2196static const struct rpc_pipe_ops gss_upcall_ops_v1 = {
2197 .upcall = gss_v1_upcall,
2198 .downcall = gss_pipe_downcall,
2199 .destroy_msg = gss_pipe_destroy_msg,
2200 .open_pipe = gss_pipe_open_v1,
2201 .release_pipe = gss_pipe_release,
2202};
2203
2204static __net_init int rpcsec_gss_init_net(struct net *net)
2205{
2206 return gss_svc_init_net(net);
2207}
2208
2209static __net_exit void rpcsec_gss_exit_net(struct net *net)
2210{
2211 gss_svc_shutdown_net(net);
2212}
2213
2214static struct pernet_operations rpcsec_gss_net_ops = {
2215 .init = rpcsec_gss_init_net,
2216 .exit = rpcsec_gss_exit_net,
2217};
2218
2219
2220
2221
2222static int __init init_rpcsec_gss(void)
2223{
2224 int err = 0;
2225
2226 err = rpcauth_register(&authgss_ops);
2227 if (err)
2228 goto out;
2229 err = gss_svc_init();
2230 if (err)
2231 goto out_unregister;
2232 err = register_pernet_subsys(&rpcsec_gss_net_ops);
2233 if (err)
2234 goto out_svc_exit;
2235 rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version");
2236 return 0;
2237out_svc_exit:
2238 gss_svc_shutdown();
2239out_unregister:
2240 rpcauth_unregister(&authgss_ops);
2241out:
2242 return err;
2243}
2244
2245static void __exit exit_rpcsec_gss(void)
2246{
2247 unregister_pernet_subsys(&rpcsec_gss_net_ops);
2248 gss_svc_shutdown();
2249 rpcauth_unregister(&authgss_ops);
2250 rcu_barrier();
2251}
2252
2253MODULE_ALIAS("rpc-auth-6");
2254MODULE_LICENSE("GPL");
2255module_param_named(expired_cred_retry_delay,
2256 gss_expired_cred_retry_delay,
2257 uint, 0644);
2258MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until "
2259 "the RPC engine retries an expired credential");
2260
2261module_param_named(key_expire_timeo,
2262 gss_key_expire_timeo,
2263 uint, 0644);
2264MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a "
2265 "credential keys lifetime where the NFS layer cleans up "
2266 "prior to key expiration");
2267
2268module_init(init_rpcsec_gss)
2269module_exit(exit_rpcsec_gss)
2270